Assembling method of battery monomer, battery monomer, battery and power utilization device

Abstract

The invention discloses an assembly method of a battery monomer, the battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. Wherein the battery monomer comprises a shell part, a pole part mounted on the shell part and an electrode part accommodated in the shell part and connected with the pole part, the shell part comprises a shell body and a shell cover, the shell body is provided with an opening, the shell cover seals the opening, the shell body or the shell cover comprises a first shell wall, and the assembly method comprises the following steps: connecting the electrode part with the pole part; a post member connected to the electrode member is mounted to the first case wall. The battery monomer assembled by the assembling method is beneficial to shortening the length of the conductive part for connecting the pole component and the electrode component, reducing the redundancy of the conductive part in the shell component, reducing the space occupied by the conductive part in the shell component, and being beneficial to improving the energy density of the battery monomer; and moreover, the risk of short circuit caused by inverted insertion of the conductive part into the active material coating part of the electrode part is reduced, and the reliability of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell assembly method, a battery cell, a battery, and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. Among them, power batteries include several battery cells. However, the reliability of battery cells needs to be improved, which makes the reliability of power batteries also need to be improved. Summary of the invention

[0003] The embodiments of the present application provide a battery cell assembly method, a battery cell, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides an assembly method for a battery cell, wherein the battery cell includes a shell component, a pole component installed on the shell component, and an electrode component housed in the shell component and connected to the pole component, wherein the shell component includes a shell body and a shell cover, wherein the shell body has an opening, the shell cover closes the opening, and the shell body or the shell cover includes a first shell wall, and the assembly method includes: connecting the electrode component to the pole component; and installing the pole component connected to the electrode component to the first shell wall.

[0005] In the above technical solution, the connection between the pole component and the electrode component is completed first, and then the connection between the pole component and the shell component is completed, rather than pre-installing the pole component and the shell component first, and then connecting the electrode component to the pole component. This is conducive to shortening the length of the conductive part connecting the pole component and the electrode component, reducing the redundancy of the conductive part in the shell component, and reducing the space occupied by the conductive part in the shell component, which is conducive to improving the energy density of the battery cell, and is conducive to reducing the risk of the conductive part being inserted into the active material coating part of the electrode component and causing a short circuit, thereby improving the reliability of the battery cell. In addition, this assembly method can realize the assembly of the battery cell regardless of whether the pole component is set on the shell body or the pole component is set on the shell cover, so the installation position of the pole component can be flexibly selected on the shell component. Among them, when the pole component is set on the shell body, it is conducive to reducing the cracking problem at the connection between the shell body and the shell cover, and improving the reliability of the battery cell.

[0006] In some embodiments, a mounting hole is provided on the first shell wall, the pole component includes a pole body, a transition structure and an insulating structure, the electrode component is connected to the pole body, the transition structure surrounds the pole body and is connected to the first shell wall, and the insulating structure is insulated and fitted between the transition structure and the pole body; the step of connecting the electrode component to the pole component specifically includes: connecting the electrode component to the pole body; the step of installing the pole component connected to the electrode component to the first shell wall specifically includes: setting the pole component connected to the electrode component at the mounting hole, and connecting the transition structure to the first shell wall.

[0007] In the above technical solution, the structure of the pole component is simple and easy to process. Since it includes two parts, namely, the pole body and the adapter structure, the shape and size of the pole body and the shape and size of the adapter structure can be separately designed based on different factors, so as to flexibly adapt to the connection requirements with different forms of shell components and electrode components, thereby increasing the scope of application of the pole component.

[0008] In some embodiments, the electrode component is connected to the pole body through a conductive part; the step of connecting the electrode component to the pole body specifically includes: placing the electrode component and the conductive part connected to the electrode component on the inner side of the first shell wall, and passing the conductive part through the mounting hole to the outside of the first shell wall; connecting the conductive part passing through the outside of the first shell wall to the pole body of the pole component placed on the outside of the first shell wall.

[0009] In the above technical solution, since the conductive part is not connected to the pole component when passing through the installation hole, it is convenient for the conductive part to pass through the installation hole, thereby improving the convenience of operation. In addition, since the welding position between the pole component and the conductive part is located outside the first shell wall, the problem of conductive chips formed during welding entering the interior of the shell body and damaging the electrode component can be improved.

[0010] In some embodiments, the steps of setting the pole component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: covering the pole component connected to the conductive part at the mounting hole from the outside of the first shell wall so that the adapter structure stops at the outside of the first shell wall; connecting the adapter structure to the first shell wall from the outside of the first shell wall.

[0011] In the above technical solution, since the pole component is covered on the mounting hole from the outside of the first shell wall, the adapter structure stops at the outside of the first shell wall, and the adapter structure is connected to the first shell wall from the outside of the first shell wall, so as to facilitate the assembly and connection of the pole component and the first shell wall, which is beneficial to improve the connection reliability of the pole component and the first shell wall.

[0012] In some embodiments, the end of the shell body opposite to the opening is a first shell wall; the steps of placing the electrode component and the conductive part connected to the electrode component on the inner side of the first shell wall, and passing the conductive part through the mounting hole to the outer side of the first shell wall specifically include: adjusting the relative positions of the shell body, the electrode component and the conductive part so that the electrode component is located on the side of the conductive part connected to it away from the shell body, and the opening of the shell body faces the conductive part; installing the electrode component and the conductive part into the shell body.

[0013] In the above technical solution, by arranging the pole component at the end of the shell body opposite to the opening, it is helpful to improve the cracking problem at the connection between the shell body and the shell cover, and improve the reliability of the battery cell.

[0014] In some embodiments, the shell cover is the first shell wall; the step of placing the electrode component and the conductive part connected to the electrode component on the inner side of the first shell wall, and passing the conductive part through the mounting hole to the outer side of the first shell wall, and the step of setting the pole component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall also includes the steps of: putting the shell body over the electrode component; connecting the shell body to the shell cover.

[0015] In the above technical solution, by first completing the connection between the shell body and the shell cover, and then connecting the pole component to the shell cover, the shell body can be used to store the electrode component and support the shell cover, which makes it easy to position and support the shell cover, so as to facilitate the connection between the shell cover and the transition structure, and improve the connection reliability between the shell cover and the pole component.

[0016] In some embodiments, the inner side of the shell cover has an insulating bracket, and the step of connecting the electrode component to the pole body also includes: before putting the shell body on the outside of the electrode component: placing the electrode component with the conductive part connected to it facing downward, and placing the shell cover with the insulating bracket facing upward; covering the outside of the electrode component supported on the top of the insulating bracket with an insulating film to connect the insulating film to the insulating bracket; the step of putting the shell body on the outside of the electrode component specifically includes: placing the shell body with the opening facing downward, and putting the shell body on the outside of the electrode component covered with the insulating film from top to bottom.

[0017] In the above technical solution, when the shell body is inserted into the outside of the electrode component, since the shell cover is not connected to the electrode component, an insulating bracket is provided on the inner side of the shell cover to support the electrode component from the bottom of the electrode component. In this way, no other limiting clamps are required, and the problem of separation of the electrode component and the shell cover can be avoided. Therefore, during assembly, the shell body only needs to be directly inserted from top to bottom, thereby simplifying the assembly process and reducing the use of limiting clamps and the like.

[0018] In some embodiments, the steps of setting the pole component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: passing the pole component connected to the electrode component through the mounting hole from the inner side of the first shell wall to the outer side of the first shell wall; covering the pole component that has passed through the outer side of the first shell wall to the mounting hole from the outer side of the first shell wall so that the adapter structure stops at the outer side of the first shell wall; connecting the adapter structure to the first shell wall from the outer side of the first shell wall.

[0019] In the above technical solution, since the electrode component and the pole component are connected first and then the pole component is passed through the mounting hole, there is no need to consider avoiding the first shell wall when connecting the electrode component and the pole component, or in other words, when connecting the electrode component and the pole component, the pole component and the electrode component are not located on both sides of the first shell wall, which is conducive to further shortening the length of the conductive part, reducing the redundancy of the conductive part after assembly, reducing the risk of reverse insertion, and improving the reliability of the battery cell. Moreover, since the welding position of the pole component and the electrode component is located outside the shell body, the problem of conductive chips formed during welding entering the inside of the shell body and causing damage to the electrode component can be improved. Moreover, since the pole component is covered on the mounting hole from the outside of the first shell wall, so that the transition structure stops at the outside of the first shell wall, and the transition structure is connected to the first shell wall from the outside of the first shell wall, so as to facilitate the assembly and connection of the pole component and the first shell wall, it is conducive to improving the connection reliability of the pole component and the first shell wall.

[0020] In some embodiments, the mounting hole is an elongated hole, and the pole component is formed into an elongated structure matching the shape of the mounting hole; the step of passing the pole component connected to the electrode component from the inner side of the first shell wall through the mounting hole to the outer side of the first shell wall specifically includes: adjusting the placement angle of the pole component so that the thickness direction of the pole component matches the width direction of the mounting hole, and the length direction of the pole component forms an angle with the length direction of the mounting hole; passing the pole component from the mounting hole to the outer side of the first shell wall according to the placement angle.

[0021] In the above technical solution, by first adjusting the placement angle of the pole component and then passing the pole component through the mounting hole, the pole component can be smoothly passed through the mounting hole, thereby improving assembly efficiency and reducing the risk of collision and scratching between the pole component and the shell component. Moreover, by setting the pole component to a long strip structure that matches the shape of the mounting hole, the pole component can be adjusted to pass through the mounting hole at an angle close to the width direction of the mounting hole in its thickness direction. After passing through the mounting hole, the thickness direction of the pole component is rotated to be close to the thickness direction of the first shell wall, so that the space required for the flipping movement of the pole component is small, which can reduce the space required for the flipping of the pole component, thereby shortening the length of the conductive part, saving materials, reducing costs, and reducing the redundancy of the conductive part, reducing the space occupied by the conductive part in the accommodating cavity, which is conducive to improving the energy density of the battery cell.

[0022] In some embodiments, making the length direction of the pole component and the length direction of the mounting hole form an angle specifically includes: making the length direction of the pole component match the diagonal direction of the mounting hole; or making the length direction of the pole component extend from one end of the length of the mounting hole to the other end of the length, and inclined to the length direction of the mounting hole.

[0023] In the above technical solution, by placing the pole component in the length direction as above, it is conducive to the pole component to pass through the installation hole smoothly, improve the assembly efficiency, and reduce the risk of collision and scratching between the pole component and the shell component.

[0024] In some embodiments, the end of the shell body opposite to the opening is a first shell wall; the step of passing the pole component connected to the electrode component from the inner side of the first shell wall through the mounting hole to the outer side of the first shell wall specifically includes: adjusting the relative positions of the shell body, the electrode component and the pole component so that the electrode component is located on the side of the pole component connected to it away from the shell body, and the opening of the shell body faces the pole component; installing the electrode component and the pole component into the shell body.

[0025] In the above technical solution, by arranging the pole component at the end of the shell body opposite to the opening, it is helpful to improve the cracking problem at the connection between the shell body and the shell cover, and improve the reliability of the battery cell.

[0026] In some embodiments, the shell cover is the first shell wall; after the step of passing the pole component connected to the electrode component from the inner side of the first shell wall through the mounting hole to the outer side of the first shell wall, the steps also include: putting the shell body on the outside of the electrode component; connecting the shell body to the shell cover; wherein the step of connecting the shell body to the shell cover is performed before the step of setting the pole component passing through the outer side of the first shell wall to the mounting hole from the outer side of the first shell wall so that the adapter structure stops at the outer side of the first shell wall.

[0027] In the above technical solution, since the connection between the shell body and the shell cover is completed first, and then the pole component is connected to the shell cover, the shell body can be used to support the shell cover, which is convenient for positioning and supporting the shell cover, so as to facilitate the connection between the shell cover and the transition structure and improve the connection reliability between the shell cover and the pole component.

[0028] In some embodiments, the shell cover is the first shell wall; after the step of passing the pole component connected to the electrode component from the inner side of the first shell wall through the mounting hole to the outer side of the first shell wall, the steps also include: putting the shell body on the outside of the electrode component; connecting the shell body to the shell cover; wherein the step of putting the shell body on the outside of the electrode component is performed after the step of connecting the adapter structure to the first shell wall from the outer side of the first shell wall.

[0029] In the above technical solution, since the pole component is connected to the shell cover first and then the shell body and the shell cover are connected, the force connecting the pole component and the shell cover will not be transmitted to the connection between the shell body and the shell cover, thereby improving the cracking problem at the connection between the shell body and the shell cover.

[0030] In some embodiments, the steps of setting the pole component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: placing the pole component connected to the electrode component and the electrode component on the inner side of the first shell wall; covering the pole component connected to the electrode component on the mounting hole from the inner side of the first shell wall so that the adapter structure stops at the inner side of the first shell wall; connecting the adapter structure to the first shell wall from the outer side of the first shell wall.

[0031] In the above technical solution, since the pole component is covered in the mounting hole from the inner side of the first shell wall, the conductive part and the pole component do not need to be operated through the mounting hole, thereby reducing the processing steps and reducing the difficulty of operation. Moreover, since the adapter structure is connected to the first shell wall from the outer side of the first shell wall, it is convenient to assemble and connect the pole component to the first shell wall, which is conducive to improving the connection reliability between the pole component and the first shell wall. In addition, since the electrode component and the pole component are connected first, and then the pole component and the electrode component are placed on the inner side of the first shell wall, it is not necessary to consider the problem of avoiding the first shell wall when connecting the electrode component and the pole component, or in other words, when connecting the electrode component and the pole component, the pole component and the electrode component are not located on both sides of the first shell wall, which is conducive to further shortening the length of the conductive part, reducing the redundancy of the conductive part after assembly, reducing the risk of inverted insertion, and improving the reliability of the battery cell. Moreover, since the welding position of the pole component and the electrode component is located outside the shell body, the problem of conductive chips formed during welding entering the inside of the shell body and causing damage to the electrode component can be improved.

[0032] In some embodiments, the end of the shell body opposite to the opening is a first shell wall; the step of placing the pole component and the electrode component connected to the electrode component on the inner side of the first shell wall specifically includes: adjusting the relative positions of the shell body, the electrode component and the pole component so that the electrode component is located on the side of the pole component connected to it away from the shell body, and the opening of the shell body faces the pole component; installing the electrode component and the pole component into the shell body.

[0033] In the above technical solution, by arranging the pole component on the shell body, it is helpful to improve the cracking problem at the connection between the shell body and the shell cover, and improve the reliability of the battery cell.

[0034] In some embodiments, the shell cover is the first shell wall; after the step of connecting the adapter structure to the first shell wall from the outside of the first shell wall, the steps further include: putting the shell body outside the electrode component; and connecting the shell body to the shell cover.

[0035] In the above technical solution, the connection between the pole component and the shell cover is completed first, and then the shell body and the shell cover are assembled and connected. Therefore, when the pole component and the shell cover are connected, since the shell body has not been sleeved on the outside of the electrode component, the electrode component can be contacted, and the pole component is stopped on the shell cover by applying a force to the electrode component. Alternatively, the conductive part can be lengthened and a force can be directly applied to the pole component from the inside of the shell cover so that the pole component is stopped on the shell cover, thereby enabling the pole component and the shell cover to be reliably and effectively connected.

[0036] In some embodiments, the insulating structure includes a sealing structure, which is arranged on the circumferential side of the transition structure facing the pole body, and is at least partially clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall. Before the step of connecting the electrode component to the pole body, it also includes: providing a pole component.

[0037] In the above technical solution, before the "step of connecting the electrode component to the pole body", the pole component is first processed into a form in which the transition structure and the pole body are sealed by a sealing structure as above, so that in the subsequent "step of setting the pole component connected to the electrode component at the mounting hole, and connecting the transition structure to the first shell wall", no seal is required between the transition structure and the first shell wall, and there is no need to apply a large sealing pressure to meet the compression degree of the seal there, thereby reducing the force on the first shell wall. In addition, when the first shell wall is the end of the shell body opposite to the opening, the force at the connection between the first shell wall and the second shell wall can also be reduced, and the force on the second shell wall can be reduced, which is conducive to ensuring the reliability of the shell body and reducing the wall thickness and cost of the shell body.

[0038] In some embodiments, the pole body includes a peripheral portion, and the transition structure is clamped on both sides of the peripheral portion in the inner and outer directions of the first shell wall through an insulating structure, and at least a portion of the sealing structure is clamped between the side of the peripheral portion facing the electrode component and the transition structure; the step of providing the pole component specifically includes: assembling or shaping the transition structure to complete the clamping of the peripheral portion and the transition structure on the sealing structure.

[0039] In the above technical solution, only the transition structure needs to be operated, and the pole body does not need to be operated, so that the pole component can be provided, thereby simplifying the operation, making the processing of the pole component easy, and realizing the relative fixation and insulation matching of the pole body and the transition structure simply and effectively. Moreover, the sealing structure can be in the matching position of the transition structure and the pole body, which is conducive to sealing the matching position of the transition structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily realizing compression sealing on it, and the seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure is clamped between the side of the peripheral portion facing the electrode component and the transition structure, the sealing structure can be sealed from the side of the peripheral portion facing the accommodating cavity, which can more effectively inhibit the leakage of electrolyte from the matching position of the pole body and the transition structure, thereby improving the sealing effect.

[0040] In some embodiments, the transition structure includes a mating ring portion, the pole body includes a penetration portion penetrated by the mating ring portion, and an inner limit portion and an outer limit portion connected to the penetration portion and clamped on the inner and outer sides of the mating ring portion, and at least a portion of the sealing structure is clamped between the mating ring portion and the inner limit portion. The step of providing a pole component specifically includes: assembling or shaping the pole body to complete the clamping of the sealing structure by the mating ring portion and the pole body.

[0041] In the above technical solution, only the pole body needs to be operated, and the transition structure does not need to be operated, so that the pole component can be provided, thereby simplifying the operation, making the processing of the pole component easy, and realizing the relative fixation and insulation matching of the pole body and the transition structure simply and effectively. Moreover, the sealing structure is clamped by the matching position of the pole body and the matching ring part, so that the sealing structure can be in the matching position of the transition structure and the pole body, which is conducive to sealing the matching position of the transition structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily realizing compression sealing on it, and the seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure is clamped between the matching ring part and the inner limit part, the sealing structure can be sealed from the side of the matching ring part facing the accommodating cavity, which can more effectively inhibit the leakage of electrolyte from the matching position of the pole body and the transition structure, thereby improving the sealing effect.

[0042] In some embodiments, a mounting hole is provided on the first shell wall, a sealing ring is arranged around the mounting hole, and the sealing ring is clamped between the pole component and the first shell wall; the pole component connected to the electrode component is arranged at the mounting hole, and the steps of connecting the adapter structure to the first shell wall specifically include: installing the sealing ring at the mounting hole of the first shell wall; and covering the pole component connected to the electrode component with the mounting hole so that the sealing ring is clamped between the pole component and the first shell wall.

[0043] In the above technical solution, the pole component has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall.

[0044] In some embodiments, the transition structure is formed into a long strip extending along the length direction of the first shell wall, and the contour shape of the pole body matches the contour shape of the transition structure; or, the transition structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is arranged at the length center position of the transition structure and is circular; before the step of connecting the electrode component to the pole body, it also includes: providing the pole body and the transition structure; assembling the pole component.

[0045] In the above technical solution, when the contour shape of the pole body is formed into a long strip that matches the contour shape of the adapter structure, the area of ​​the pole body is large, which is conducive to increasing the connection area between the conductive part and the pole body, thereby improving the charging performance. When the pole body is arranged at the length center of the long strip adapter structure and is circular, it is conducive to reducing the connection area between the pole body and the adapter structure, improving the force uniformity at the connection between the pole body and the adapter structure, thereby improving the connection reliability between the pole body and the adapter structure.

[0046] In some embodiments, the pole component includes a pole body, the pole body includes a first pole component and a second pole component, the second pole component is installed on the first shell wall, the first pole component is installed on the second pole component, and the electrode component is connected to the first pole component; the step of connecting the electrode component to the pole component specifically includes: connecting the electrode component to the first pole component; the step of installing the pole component connected to the electrode component to the first shell wall specifically includes: assembling and connecting the first pole component connected to the electrode component to the second pole component installed on the first shell wall.

[0047] In the above technical solution, by dividing the pole body into two parts for assembly connection, when assembling the battery cell, the first pole member and the electrode member can be connected first, and the second pole member and the first shell wall can be connected, and then the first pole member and the second pole member can be connected, which is beneficial to shorten the conductive part and reduce the redundancy of the conductive part and the material cost.

[0048] In some embodiments, the second pole piece defines a mating hole, and the first pole piece is covered on the side of the second pole piece away from the electrode component and covers the mating hole; the step of assembling the first pole piece connected to the electrode component to the second pole piece installed on the first shell wall specifically includes: covering the first pole piece connected to the electrode component in the mating hole from the outside of the second pole piece; connecting the first pole piece from the outside of the first shell wall to the second pole piece.

[0049] In the above technical solution, by providing the matching hole, the first pole piece and the second pole piece can be connected from the outside of the pole piece, which is beneficial to improving the connection convenience and connection reliability of the first pole piece and the second pole piece.

[0050] In some embodiments, the step of connecting the electrode component to the first pole component specifically includes: placing the electrode component and the conductive part on the inner side of the first shell wall, and passing the conductive part through the matching hole to the outside of the second pole component; connecting the conductive part passing through the outside of the first shell wall to the first pole component placed on the outside of the first shell wall.

[0051] In the above technical solution, since the conductive part is not connected to the first pole piece when passing through the matching hole, it is convenient for the conductive part to pass through the matching hole, thereby improving the convenience of operation. Moreover, since the welding position between the first pole piece and the conductive part is located outside the first shell wall, the problem of conductive chips formed during welding entering the interior of the shell body and causing damage to the electrode parts can be improved.

[0052] In some embodiments, before the step of covering the first pole piece connected to the electrode component on the matching hole from the outside of the second pole piece, the step also includes: placing the electrode component and the first pole piece connected to the electrode component on the inner side of the first shell wall; and passing the first pole piece through the matching hole to the outside of the second pole piece.

[0053] In the above technical solution, since the electrode component and the first pole component are connected first and then the first pole component is passed through the matching hole, there is no need to consider avoiding the first shell wall when connecting the electrode component and the first pole component, or in other words, when connecting the electrode component and the first pole component, the second pole component and the electrode component are not located on both sides of the first shell wall, which is conducive to further shortening the length of the conductive part, reducing the redundancy of the conductive part after assembly, reducing the risk of reverse insertion, and improving the reliability of the battery cell. In addition, since the welding position of the electrode component and the first pole component is located outside the shell body, the problem of conductive chips formed during welding entering the inside of the shell body and causing damage to the electrode component can be improved.

[0054] In some embodiments, the pole ear portion of the electrode component includes a gathered portion formed by stacking and connecting multiple layers of pole ear sheets, and the pole ear portion is connected to the pole column component through the gathered portion; before the step of connecting the electrode component to the pole column component, it also includes: stacking and connecting multiple layers of pole ear sheets in the pole ear portion of the electrode component to form the gathered portion.

[0055] In the above technical solution, by connecting the multiple layers of pole ear sheets in the pole ear part to form a gathered part, the gathered part can present the form of a plate with multiple layers of pole ear sheets connected together and having a certain rigidity, rather than a fluffy and scattered multiple layers of foil. On the one hand, it is convenient for the punching operation of the pole ear part, such as facilitating the operation of drilling mounting holes or matching holes in the pole ear part, thereby improving the processing efficiency. On the other hand, it makes the welding between the gathered part and the pole column component more reliable, and pores are not easily formed in the weld, which can improve the connection reliability and conductivity of the welding point, and make the conductivity between the electrode component and the pole column component more stable and reliable.

[0056] In some embodiments, the electrode component includes multiple electrode assemblies; the step of connecting multiple layers of pole ear sheets in the pole ear portion of the electrode component to form a gathered portion specifically includes: stacking multiple electrode assemblies along the thickness direction of the electrode assembly; stacking and connecting multiple layers of pole ear sheets of at least two electrode assemblies to form a gathered portion.

[0057] In the above technical scheme, on the one hand, the total number of the gathered parts can be reduced, the connection steps between the gathered parts and the pole body can be reduced, and the processing efficiency can be improved. On the other hand, it can avoid the problem of cracking at the connection position between the pole ear and the active material coating part due to the asynchronous movement of the pole ear sheets of different electrode assemblies when the gathered parts are manufactured first and the electrode assemblies are stacked later, resulting in tensile stress between each other.

[0058] In some embodiments, the ear portion of the electrode component includes a gathered portion formed by stacking and connecting multiple layers of ear sheets, and the pole component includes a pole body, and the surface of the pole body at one end facing the electrode component is the inner end surface of the pole body; the step of connecting the electrode component to the pole component specifically includes: laying the gathered portion on the inner end surface of the pole body; connecting the gathered portion to the inner end surface of the pole body.

[0059] In the above technical solution, the gathering portion is laid on the inner end surface of the pole body so that the gathering portion is flattened and at least part of the gathering portion falls on the inner end surface of the pole body, thereby preventing the pole ear from being damaged due to bending the gathering portion, thereby improving the charging performance, facilitating the setting of the welding nozzle, and improving the connection reliability between the gathering portion and the pole body.

[0060] In some embodiments, the shell component has a accommodating cavity, and the pole component is surrounded by a accommodating groove that is recessed relative to the first shell wall in a direction away from the electrode component and open in a direction toward the electrode component; before the step of laying the retracted portion on the inner end surface of the pole body, it also includes: installing the retracted portion into the accommodating groove.

[0061] In the above technical solution, by providing a receiving groove to accommodate the retracted portion, the space occupied by the pole ear portion in the receiving cavity can be reduced, so that the receiving cavity has a larger space to accommodate the active material coating portion, which is beneficial to increase the volume of the active material coating portion, thereby increasing the energy density of the battery cell.

[0062] In some embodiments, the electrode component includes a plurality of electrode assemblies stacked together; before the step of laying the gathered portion on the inner end surface of the pole body, the step also includes: arranging the pole component on one side of the protruding pole ear portion of the electrode component; adjusting the angle of the pole component so that the normal of the inner end surface of the pole body is close to the stacking direction of the plurality of electrode assemblies.

[0063] In the above technical solution, the position and angle of the pole component are first adjusted so that the normal direction of the inner end surface of the pole body is close to the stacking direction of multiple electrode assemblies, and then the gathering portion is laid on the inner end surface of the pole body. Thereafter, there is no need to adjust the angle of the pole body, so that there is enough space near the matching position between the gathering portion and the inner end surface of the pole body to perform the welding operation of the gathering portion and the pole body, thereby simplifying the operation.

[0064] In some embodiments, the pole component includes a pole body, the electrode component is connected to the pole body through a conductive part, the conductive part includes a pole ear part composed of a pole ear sheet of the electrode component, and a conductive member connected to the pole ear part, and the pole ear part is connected to the pole body through the conductive member; the step of connecting the electrode component to the pole component specifically includes: connecting the pole ear part to the conductive member.

[0065] In the above technical solution, the pole ear part and the pole body are connected by a conductive part, which can shorten the length of the pole ear part and improve the problems of wrinkling, bending and breaking of the pole ear piece. Moreover, the shape and material of the conductive part can be flexibly designed to reduce the difficulty of connection with the pole body and improve the convenience of connection between the conductive part and the pole body.

[0066] In some embodiments, the electrode component includes multiple electrode assemblies; before the step of connecting the pole ear portion to the conductive member, it also includes: stacking multiple electrode assemblies along the thickness direction of the electrode assembly; stacking and gathering the multi-layer pole ear sheets of at least two electrode assemblies to form a stacked portion.

[0067] In the above technical scheme, before connecting the pole ear part and the conductive part, multiple electrode assemblies are stacked first, and several pole ear sheets of the same polarity of the multiple electrode assemblies are gathered together to form a stacking part. Compared with the technical scheme of individually gathering the pole ear sheets of each electrode assembly to form a stacking part, individually connecting the stacking part of each electrode assembly to the conductive part, and then stacking multiple electrode assemblies, on the one hand, the total number of stacking parts and conductive parts can be reduced, the connection steps between the stacking part and the conductive part can be reduced, and the processing efficiency can be improved. On the other hand, it can avoid the problem of tensile stress formed between the pole ear sheets of different electrode assemblies due to the asynchronous movement when the stacking part and the conductive part are connected first and then the electrode assemblies are stacked, causing cracks at the connection position between the pole ear part and the active material coating part.

[0068] In some embodiments, the pole ear portion of the electrode component includes a stacked portion formed by stacking and gathering multiple pole ear sheets; before the step of connecting the pole ear portion to the conductive member, the step also includes: connecting the multiple pole ear sheets in the stacked portion to form a gathered portion.

[0069] In the above technical solution, by pre-connecting the multiple layers of pole ear sheets in the stacked part to form a gathered part, the gathered part can present the form of a plate with multiple layers of pole ear sheets connected together and having a certain rigidity, rather than a fluffy and scattered multiple layers of foil, thereby facilitating the coordinated connection between the pole ear part and the conductive part, and making the welding between the pole ear part and the conductive part more reliable, and making it less likely to form pores in the weld, which can improve the connection reliability and conductivity of the weld, and make the conduction between the electrode component and the pole column component more stable and reliable.

[0070] In some embodiments, the conductive member includes a first connecting segment, and the step of connecting the pole ear portion to the conductive member specifically includes: overlapping the gathered portion on one side in the thickness rear direction of the first connecting segment; and connecting the gathered portion to the first connecting segment.

[0071] In the above technical solution, by setting the first connecting section and the gathering portion to be consistent in thickness direction, and the two are overlapped and connected along the thickness direction of the first connecting section, the matching mode between the gathering portion and the conductive member is simple, which is conducive to improving production efficiency.

[0072] In some embodiments, the conductive member includes a first connecting section, which includes two clamping parts; the step of connecting the pole ear portion to the conductive member specifically includes: clamping the pole ear end of the pole ear portion between the two clamping parts; connecting the pole ear end of the pole ear portion and the two clamping parts into one.

[0073] In the above technical solution, the two clamping parts can be used to limit the pole ear part, thereby improving the connection reliability of the multi-layer pole ear sheets in the pole ear part. In addition, in some examples, by setting two clamping parts, the pole ear part clamped between the two clamping parts can be in the state of a laminated part, that is, the step of connecting the multi-layer pole ear sheets in the laminated part to form a gathered part can be omitted, thereby simplifying the processing procedure and improving the processing efficiency. Of course, it is also possible to first connect the multi-layer pole ear sheets in the laminated part to form a gathered part, and then clamp the gathered part between the two clamping parts and connect it to the clamping parts, so as to reduce the porosity at the connection between the conductive part and the pole ear part, and improve the current capacity and connection reliability.

[0074] In some embodiments, the step of connecting the pole ear to the conductive member further includes: adjusting the angle of the pole component so that the inner end surface of the pole body faces the electrode component and the first connecting section of the conductive member is supported on the side of the pole ear away from the pole body.

[0075] In the above technical solution, the first connecting section of the conductive member supports the pole ear, which can improve the redundancy of the pole ear and reduce the risk of short circuit caused by the pole ear being inserted into the active material coating part. In addition, the bent conductive member can play a role of buffer support, reduce the risk of the electrode component hitting the first shell wall, and improve the reliability of the battery cell.

[0076] In some embodiments, the step of connecting the electrode component to the pole component further includes: connecting the conductive member to the pole body.

[0077] In the above technical solution, by providing the conductive member and the pole body as separate parts and assembling them together, the conductive member and the pole body can be flexibly designed and processed, thereby improving the diversity of battery cells.

[0078] In some embodiments, the pole component includes a pole body, and the surface of one end of the pole body facing the electrode component is the inner end face of the pole body; the conductive member includes a second connecting section, and the step of connecting the conductive member to the pole body specifically includes: laying the second connecting section on the inner end face of the pole body; connecting the second connecting section to the inner end face of the pole body.

[0079] In the above technical solution, by laying the second connection section of the conductive member on the inner end surface of the pole body, at least part of the second connection section falls on the inner end surface of the pole body and is connected to the inner end surface of the pole body, which is conducive to increasing the connection area between the second connection section of the conductive member and the pole body and improving the charging performance. It is also convenient to set the welding nozzle and improve the connection reliability between the second connection section of the conductive member and the pole body.

[0080] In some embodiments, the pole component is surrounded by a receiving groove that is recessed relative to the first shell wall in a direction away from the electrode component and open in a direction toward the electrode component; before the step of laying the second connecting section on the inner end surface of the pole body, it also includes: installing the second connecting section into the receiving groove.

[0081] In the above technical solution, by providing a receiving groove to receive the second connecting section, the space occupied by the conductive member in the receiving cavity can be reduced, so that the receiving cavity has a larger space to receive the active material coating part, which is beneficial to increase the volume of the active material coating part, thereby increasing the energy density of the battery cell. Moreover, since the receiving groove is open toward the electrode component, the second connecting section can be easily extended into the receiving groove, reducing the difficulty of operation.

[0082] In some embodiments, the electrode component includes a plurality of electrode assemblies stacked together; before the step of laying the second connecting section on the inner end surface of the pole body, it also includes: arranging the pole component on one side of the protruding pole ear portion of the electrode component; adjusting the angle of the pole component so that the normal of the inner end surface of the pole body is close to the stacking direction of the plurality of electrode assemblies.

[0083] In the above technical solution, by first adjusting the position and angle of the pole component so that the normal of the inner end surface of the pole body is close to the stacking direction of multiple electrode assemblies, and then laying the second connecting section of the conductive member on the inner end surface of the pole body, there is no need to adjust the angle of the pole body. Thereby, there is enough space near the matching position of the second connecting section and the inner end surface of the pole body to perform the welding operation of the second connecting section and the pole body, thereby simplifying the operation.

[0084] In some embodiments, the electrode component is connected to the pole body through a conductive portion, the conductive portion includes a pole ear portion composed of a pole ear sheet of the electrode component, and a conductive member connected to the pole ear portion, the position of the inner end surface of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, and the inner end surface of the pole body protrudes from the surrounding area toward the electrode component; the conductive member includes a first conductive segment laid on the inner end surface of the pole body, and a second conductive segment staggered from the inner end surface of the pole body, and the second conductive segment protrudes relative to the first conductive segment in a direction away from the electrode component; the step of connecting the electrode component to the pole component also includes: shaping the conductive member so that the conductive member includes a first conductive segment and a second conductive segment; connecting the pole ear portion to the second conductive segment.

[0085] In the above technical solution, the arrangement of the conductive member can fully utilize the space and meet the connection requirements with the pole body and the conductive part, making the design of the battery cell more diverse and flexible.

[0086] In some embodiments, the electrode component is connected to the pole body through a conductive part, the conductive part includes a pole ear part composed of a pole ear sheet of the electrode component, and a conductive member connected to the pole ear part, the position of the inner end face of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, the surrounding area protrudes from the inner end face of the pole body toward the electrode component, and the inner end face of the pole body includes a matching area opposite to the annular hole of the surrounding area; the conductive member includes a first conductive segment laid in the matching area, the conductive member includes a third conductive segment staggered from the matching area, the third conductive segment protrudes toward the direction of the electrode component relative to the first conductive segment, and the pole ear part is connected to the third conductive segment; the step of connecting the electrode component to the pole component also includes: shaping the conductive member so that the conductive member includes a first conductive segment and a third conductive segment; connecting the pole ear part to the third conductive segment.

[0087] In the above technical solution, the arrangement of the conductive member can fully utilize the space and meet the connection requirements with the pole body and the conductive part, making the design of the battery cell more diverse and flexible.

[0088] In some embodiments, the electrode component includes an active material coating portion, which is connected to the pole component through a conductive portion, and the conductive portion is bent to form at least two open grooves, and the opening directions of two adjacent open grooves are different, and the two adjacent open grooves are adjacent in the direction from the pole component to the active material coating portion; the step of installing the pole component connected to the electrode component to the first shell wall specifically includes: shaping the conductive portion so that the conductive portion is bent to form at least two open grooves.

[0089] In the above technical solution, the conductive part can be in a reciprocating serpentine shape, and the conductive part can play a buffering role. When the battery cell is used in a vibration environment, it can reduce the impact of the active material coating part toward the first shell wall, play a role in protecting the electrode components, and improve the reliability of the battery cell. In addition, since the conductive part does not extend randomly, it can improve the mutual interference and scratching between the pole tabs in the conductive part, and the risk of the pole tabs being inserted into the active material coating part, thereby further improving the reliability of the battery cell.

[0090] In some embodiments, the step of shaping the conductive portion so that the conductive portion is bent to form at least two open grooves specifically includes: shaping the conductive portion so that the conductive portion is bent to form two open grooves with openings facing opposite directions.

[0091] In the above technical solution, the steps can be simplified, and the conductive part can be in a reciprocating bending shape, thereby shortening the length of the conductive part, simplifying the structure of the conductive part, and facilitating the processing of the conductive part.

[0092] In some embodiments, the battery cell includes a shaping bracket arranged on a side of the electrode component close to the pole component, and the shaping bracket has a through hole, wherein, when the conductive part is penetrated through the through hole, the active material coating part connected to the conductive part is located on the inner side of the shaping bracket, and the pole component connected to the conductive part is located on the outer side of the first shell wall, the step of shaping the conductive part so that the conductive part is bent to form two open grooves with openings facing opposite directions specifically includes: accompanying the action of covering the pole component in the direction of the first shell wall, the conductive part forms two open grooves with openings facing opposite directions on the inner and outer sides of the shaping bracket.

[0093] In the above technical solution, by providing a shaping bracket, the conductive part is conveniently bent to form two opening grooves with openings facing opposite directions, thereby reducing the difficulty of processing.

[0094] In a second aspect, an embodiment of the present application further provides a battery cell, which is processed using the above-mentioned assembly method.

[0095] In the above technical solution, since the battery cell according to the embodiment of the present application is processed by the above assembly method, the reliability of the battery cell is improved.

[0096] In some embodiments, the shell body is semi-enclosed cylindrical and has an opening at one end, and the end of the shell body opposite to the opening serves as the first shell wall, or the shell cover is flat and serves as the first shell wall.

[0097] In the above technical solution, the shell components have various shapes and can adapt to various application scenarios.

[0098] In some embodiments, the battery cell further includes a pressure relief device, which is disposed on the housing component and is located on the same side or on the opposite side as the pole component.

[0099] In the above technical solution, when the pressure relief device and the pole component are located on the same side, the design of the shell walls other than the first shell wall can be simplified, and the structure and processing of the battery cell can be simplified. When the pressure relief device and the pole component are located on different sides, there is no need to consider the space occupied by the pressure relief device on the first shell wall, and the volume of the pole component is reduced, so that the shape and volume of the pole component can be flexibly designed according to needs.

[0100] In a third aspect, an embodiment of the present application further provides a battery, comprising a battery cell of any of the above-mentioned solutions.

[0101] In the above technical solution, since the reliability of the battery cell according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery.

[0102] In some embodiments, the battery includes a box body, a plurality of battery cells are accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole component is arranged on the side of the shell component facing the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

[0103] In the above technical solution, when the pole component of the battery cell is arranged on the side of the shell component facing the bottom plate of the box body, the battery cell is in an inverted state, and the decompression product is sprayed in the direction away from the passenger compartment, which is safer; when the pole component of the battery cell is arranged on the side of the shell component close to the bottom plate of the box body, the battery cell is in an upright state, and the electrolyte is not easy to leak; therefore, the flexible setting of the orientation of the battery cell and the box body can be achieved.

[0104] In a fourth aspect, an embodiment of the present application further provides an electrical device, comprising a battery according to any of the above solutions.

[0105] In the above technical solution, since the performance of the battery is improved, it is beneficial to improve the working power performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0106] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0107] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0108] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0109] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0110] Figure 4 An exploded view of a battery cell provided in some embodiments of the present application;

[0111] Figure 5 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0112] Figure 6 for Figure 5 A partial enlarged view of

[0113] Figure 7 An exploded view of a battery cell provided for some embodiments of the present application;

[0114] Figure 8 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0115] Fig. 9 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0116] Figures 10A-10D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0117] Figures 11A-11D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0118] Figure 12A-12E An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0119] Figure 13A-13E An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0120] Fig.14 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0121] Fig.15 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0122] Fig.16 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0123] Fig.17 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0124] Figures 18A-18G An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0125] Fig.19 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0126] Fig. 20 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0127] Fig.21 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0128] Fig. 22 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0129] Figure 23A-23DAn exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0130] Figure 24A-Figure 24D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0131] Fig.25 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0132] Fig.26 A schematic diagram of assembling the mounting holes and the pole components provided in some embodiments of the present application;

[0133] Fig. 27 Schematic diagram of assembly of mounting holes and pole components provided in other embodiments of the present application;

[0134] Fig.28 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0135] Fig.29 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0136] Figures 30A-30D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0137] Figures 31A-31D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0138] Fig.32 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0139] Fig.33 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0140] Figure 34A-Figure 34D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0141] Fig.35 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0142] Figure 36A-Figure 36D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0143] Fig.37 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0144] Fig.38A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0145] Fig.39 A top view of a battery cell provided for some embodiments of the present application;

[0146] Fig.40 For along Fig.39 Sectional view along line AA;

[0147] Fig.41 A schematic diagram of a pole component provided for some embodiments of the present application;

[0148] Fig.42 for Fig.41 A top view of the pole component shown in ;

[0149] Fig.43 For along Fig.42 The view from direction B shown in FIG.

[0150] Fig.44 For along Fig.42 Sectional view of the mid-CC line;

[0151] Fig.45 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0152] Fig.46 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0153] Fig.47 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0154] Fig.48 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0155] Fig.49 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0156] Fig.50 An exploded view of a processing process of a third adapter ring provided in some embodiments of the present application;

[0157] Fig.51 An exploded view of a processing process of a pole component provided in some embodiments of the present application;

[0158] Fig.52 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0159] Fig.53 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0160] Fig.54 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0161] Fig.55 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0162] Fig.56 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0163] Fig.57 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0164] Fig.58 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0165] Fig.59 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0166] Figure 60A-60D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0167] Fig.61 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0168] Fig.62 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0169] Fig.63 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0170] Figure 64A-Figure 64D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application;

[0171] Fig.65 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0172] Figure 66A-Figure 66C An exploded view of the processing process of an electrode component provided by one embodiment of the present application;

[0173] Fig.67 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0174] Fig.68 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0175] Fig.69 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0176] Fig.70 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0177] Fig.71 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0178] Fig.72 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0179] Fig.73 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0180] Fig.74 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0181] Fig.75 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0182] Fig.76 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0183] Fig.77 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0184] Fig.78 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0185] Fig.79 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0186] Fig.80 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0187] Fig.81 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0188] Fig.82 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0189] Fig.83 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0190] Fig.84 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0191] Fig.85 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application;

[0192] Fig.86 A flowchart of the steps of a battery cell assembly method provided in some embodiments of the present application.

[0193] Reference numerals:

[0194] Vehicles 1000;

[0195] Battery 100; Controller 200; Motor 300;

[0196] Box body 101; first box part 1011; second box part 1012;

[0197] Battery cell 102; first direction F1; second direction F2; third direction F3;

[0198] fifth direction F4; fifth direction F5;

[0199] Shell component 1; shell body 11; first shell wall 111;

[0200] First sink 1111; overlapping portion 1112;

[0201] Mounting hole 112; opening 113; second shell wall 114;

[0202] Shell cover 12; Insulation bracket 121;

[0203] Accommodating chamber 13; sealing ring 14;

[0204] Pole component 2;

[0205] Pole body 21; inner end surface 211;

[0206] The penetration portion 214; the riveting portion 2141;

[0207] Inner limiting portion 215; outer limiting portion 216;

[0208] First pole piece 21a; second pole piece 21b; matching hole 21b1;

[0209] Transfer structure 22;

[0210] An inner ring 2211 of the switching structure; an outer ring 2212 of the switching structure;

[0211] The inner end surface 220 of the transition structure; the surrounding area 2201;

[0212] flange portion 22a; second sinking groove 22b;

[0213] A first adapter ring 221; a second adapter ring 222; a stop ring portion 2221;

[0214] A first insulating frame 224;

[0215] A third adapter ring 223; an inner extension portion 2231; an outer extension portion 2232;

[0216] Second insulating frame 225; fourth adapter ring 227; matching ring portion 2271;

[0217] A third insulating frame 228;

[0218] Insulation structure 23;

[0219] Sealing structure 231; Shaft side portion 231a;

[0220] A first insulating member 232; a second insulating member 234;

[0221] Insulating sealing member 24;

[0222] Electrode component 3; electrode assembly 31; pole tab 311;

[0223] Lamination portion 312; Gathering portion 313;

[0224] Active material coating portion 32;

[0225] Pole ear portion 33; Pole ear end portion 331;

[0226] Conductive portion 4; conductive member 41;

[0227] Opening slot 42; first opening slot 421; second opening slot 422;

[0228] First connecting section 411; clamping portion 4110; second connecting section 412;

[0229] A first conductive segment 415; a second conductive segment 416; a third conductive segment 417;

[0230] Accommodating groove 5; pressure relief device 6; insulating film 7; binding member 8;

[0231] Plastic support 9; perforation 91. DETAILED DESCRIPTION

[0232] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0233] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0234] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0235] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0236] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0237] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0238] The term "plurality" used in the present application refers to more than two, including two.

[0239] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery or a solid-state battery, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, rectangular or in other shapes, etc., and the embodiments of the present application do not limit this.

[0240] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery may include a box for encapsulating one or more battery cells, or one or more battery modules, and the box may prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0241] The battery cell includes a shell component, an electrode component and an electrolyte (in a solid-state battery, it can be a solid electrolyte layer located between the positive and negative electrodes). The electrode component includes at least one electrode assembly. The electrode assembly and the electrolyte are both contained in the shell component. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator (this structure can be omitted in a solid-state battery). The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.

[0242] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0243] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. The material of the isolation film may be PP, polypropylene or PE, polyethylene, etc. The electrode assembly mentioned in the embodiment of the present application is a winding or laminated structure.

[0244] In some battery cells in the related technology, the shell includes a shell body and a shell cover, and the shell cover is pre-installed with a pole. When assembling the battery cell, the electrode assembly and the shell cover with the pole pre-installed are first placed flat, so that the electrode assembly is placed on one side in the width direction of the shell cover, and then the pole ear of the electrode assembly is overlapped on the pole pre-installed on the shell cover, and the pole ear and the pole are welded, and then the electrode assembly is flipped to one side in the thickness direction of the shell cover, and then the shell body is put outside the electrode assembly, and the shell body and the shell cover are welded together.

[0245] In the above assembly process, since the electrode assembly needs to be flipped from one side in the width direction of the shell cover to one side in the thickness direction of the shell cover, the length of the pole ear needs to be longer (for example, at least greater than half of the width of the shell cover) to meet the flipping requirements of the electrode assembly. However, due to the long length of the pole ear, after the assembly is completed, the pole ear will have more redundancy in the shell. On the one hand, the pole ear will occupy more space in the shell, affecting the energy density of the battery cell. On the other hand, there is a risk of the pole ear being inserted into the electrode assembly and causing a short circuit, affecting the reliability of the battery cell. Moreover, this assembly method is only suitable for the solution in which the pole is pre-installed on the shell cover. If the pole is pre-installed on the shell body, the installation cannot be achieved. Specifically, if the pole is pre-installed on the shell body, after the electrode assembly is installed in the shell body, there is no space in the shell body to extend the welding tool, and the pole ear cannot be welded from the inside of the shell body with the pole pre-installed on the shell body. If the welding tool is placed on the outside of the shell body, since the pole has a certain thickness and is completely blocked on the outside of the pole ear, the pole column and the pole ear cannot be reliably welded together from the outside of the pole column.

[0246] In view of this, the embodiment of the present application proposes a method for assembling a battery cell, which first completes the connection between the pole component and the electrode component, and then completes the connection between the pole component and the shell component, rather than first completing the pre-installation of the pole component and the shell component, and then connecting the electrode component to the pole component. In this way, it is beneficial to shorten the length of the conductive part connecting the pole component and the electrode component, reduce the redundancy of the conductive part in the shell component, and reduce the space occupied by the conductive part in the shell component, which is beneficial to improve the energy density of the battery cell, and is beneficial to reduce the risk of the conductive part being inserted into the active material coating part of the electrode component and causing a short circuit, thereby improving the reliability of the battery cell. In addition, this assembly method can realize the assembly of the battery cell regardless of whether the pole component is set on the shell body or the pole component is set on the shell cover, so the installation position of the pole component can be flexibly selected on the shell component. Among them, when the pole component is set on the shell body, it is beneficial to reduce the cracking problem at the connection between the shell body and the shell cover, and improve the reliability of the battery cell.

[0247] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries including battery cells, and electrical devices using batteries.

[0248] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0249] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0250] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery 100, and the battery 100 can be provided at a position such as the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000.

[0251] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0252] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0253] Please refer to Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of the present application includes a battery cell 102 and a box 101 for accommodating the battery cell 102. The box 101 can be in various structural forms.

[0254] In some embodiments, the box body 101 may include a first box portion 1011 and a second box portion 1012, the first box portion 1011 and the second box portion 1012 cover each other, and the first box portion 1011 and the second box portion 1012 jointly define a storage space for accommodating the battery cell 102. A sealing member may also be provided at the connection position between the first box portion 1011 and the second box portion 1012 to achieve a sealed connection between the first box portion 1011 and the second box portion 1012. For example, referring to Figure 2 , the first box part 1011 and the second box part 1012 can both be hollow structures with one side open, and the open side of the first box part 1011 covers the open side of the second box part 1012, thereby forming a box body 101 with a storage space. For another example, the second box part 1012 can be a hollow structure with one side open, and the first box part 1011 is in the form of a cover and can cover the open side of the second box part 1012. The box body 101 can be in various shapes, such as a cylindrical box body, a rectangular box body, etc.

[0255] In the battery 100, there may be one or more battery cells 102. If there are more than one battery cell 102, the battery cells 102 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 102 are connected in series and in parallel. The battery cells 102 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the battery cells 102 may be accommodated in the box 101; of course, the battery cells 102 may be connected in series, in parallel, or in a mixed connection to form a battery module, and then the battery modules may be connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 101. In some embodiments, the battery cells 102 may be electrically connected through a busbar component to achieve parallel, series, or mixed connection of the battery cells 102.

[0256] Please refer to Figure 3 , Figure 3 The schematic diagram of the structure of the battery cell 102 provided in some embodiments of the present application. The battery cell 102 is in the form of a rectangular parallelepiped, the height direction of the battery cell 102 is the first direction F1, the thickness direction of the battery cell 102 is the second direction F2, the width direction of the battery cell 102 is the third direction F3, and the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other.

[0257] Please refer to Figure 4-Figure 8 , Figure 4 An exploded view of a battery cell provided in some embodiments of the present application; Figure 5 A cross-sectional view of a battery cell provided for some embodiments of the present application; Figure 6 for Figure 5 A partial enlarged view of Figure 7 An exploded view of a battery cell provided for some embodiments of the present application; Figure 8A cross-sectional view of a battery cell provided for some embodiments of the present application.

[0258] Combination Figure 4-Figure 6 The battery cell 102 may include a housing component 1 , a pole component 2 and an electrode component 3 .

[0259] Combination Figure 4-Figure 6 , the pole component 2 is installed on the shell component 1. Exemplarily, the shell component 1 has a accommodating cavity 13, and the shell component 1 includes a first shell wall 111, the first shell wall 111 participates in forming the accommodating cavity 13, and the first shell wall 111 has a mounting hole 112, and the pole component 2 is installed on the first shell wall 111, and is arranged at the mounting hole 112. Among them, "the pole component 2 is installed on the first shell wall 111" means that there is an assembly connection relationship between the pole component 2 and the first shell wall 111, for example, welding or riveting. Therefore, the shell component 1 and the pole component 2 are separate components, and the two are assembled and connected, so that the shell component 1 can be processed separately, and the pole component 2 can be processed separately, so that the processing of the two is convenient, and it is conducive to the processing and manufacturing of the battery cell 102.

[0260] Combination Figure 4-Figure 6 , the electrode component 3 is accommodated in the shell component 1. Exemplarily, the electrode component 3 includes: an active material coating portion 32 and a pole ear portion 33, the active material coating portion 32 is accommodated in the accommodating cavity 13, and the pole ear portion 33 is connected to the active material coating portion 32. The electrode component 3 includes one or more electrode assemblies 31, and the portion of the current collector coated with the active material layer in the electrode assembly 31 constitutes the active material coating portion 32, and the portion not coated with the active material layer constitutes the pole ear portion 33, and the pole ear portion 33 includes a multilayer pole ear sheet 311.

[0261] The pole component 2 and the first shell wall 111 are located on the same side of the electrode component 3, that is, the pole component 2 is arranged on the side where the first shell wall 111 is located, so that the pole component 2 can be installed at the installation hole 112 of the first shell wall 111. For example, when the first shell wall 111 is located above the electrode component 3, the pole component 2 is also located above the electrode component 3; when the first shell wall 111 is located below the electrode component 3, the pole component 2 is also located below the electrode component 3; when the first shell wall 111 is located on the side of the electrode component 3, the pole component 2 is also located on the same side of the electrode component 3.

[0262] Exemplarily, the housing component 1 may be surrounded by a plurality of walls facing in different directions, one of which is the first housing wall 111, and a plane perpendicular to the penetration direction of the mounting hole 112 is taken as a projection plane, and the orthographic projection of the mounting hole 112 on the projection plane completely falls within the range of the orthographic projection of the first housing wall 111 on the projection plane, and the orthographic projection area of ​​the mounting hole 112 is smaller than the orthographic projection area of ​​the first housing wall 111. One or more mounting holes 112 may be provided on the first housing wall 111 to meet the installation requirements of one or more pole components 2.

[0263] Combination Figure 5-Figure 8 , the electrode component 3 is connected to the pole component 2. The electrode component 3 is connected to the pole component 2 through the conductive part 4. The pole component 2 includes a pole body 21, and the active material coating part 32 is connected to the pole body 21 through the conductive part 4 to form electrical conduction. Exemplarily, the battery 100 includes a busbar component located outside the battery cell 102, and the pole body 21 is connected to the busbar component to form electrical conduction, so that a plurality of battery cells 102 can be connected through the busbar component.

[0264] Exemplarily, when the pole component 2 is a negative pole, the pole body 21 can be a copper-aluminum composite part, wherein the copper-aluminum composite part can include an aluminum part and a copper part, the aluminum part is arranged on the side of the copper part away from the active material coating part 32, and is easy to form a reliable connection with the aluminum runner component, and the copper part is easy to connect with the copper foil pole ear piece 311 of the negative pole; and when the pole component 2 is a positive pole, the pole body 21 can be an aluminum part, and the aluminum part is easy to form a reliable connection with the aluminum runner component, and the aluminum part is also easy to connect with the aluminum foil pole ear piece 311 of the positive pole.

[0265] The connection method between the conductive part 4 and the pole component 2 is not limited, for example, it may include, but not limited to, ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure fusion welding, brazing, gluing, etc.

[0266] For example, refer to Figure 6 The conductive part 4 may include a pole ear part 33 and a conductive member 41 connected to the pole ear part 33, and the pole ear part 33 is indirectly connected to the pole body 21 through the conductive member 41. The conductive member 41 may be a part of the electrode component 3, or the conductive member 41 may be a part of the pole component 2, or the conductive member 41 may be independent of the electrode component 3 and the pole component 2.

[0267] Therefore, by indirectly connecting the pole ear portion 33 and the pole body 21 through the conductive member 41, the length of the pole ear portion 33 can be shortened, and the problems of wrinkling, bending and breaking of the pole ear piece 311 can be improved. Moreover, by flexibly designing the shape and material of the conductive member 41, the difficulty of connection with the pole body 21 can be reduced, and the convenience of connection between the conductive member 41 and the pole body 21 can be improved.

[0268] For example, refer to Figure 8 The conductive part 4 includes the pole ear part 33, and is connected to the pole body 21 through the pole ear part 33, that is, the conductive member 41 is not required, and the pole ear part 33 can be directly connected to the pole body 21. Therefore, the use of the conductive member 41 can be omitted, and the connection process of the conductive member 41 and the pole ear part 33 can be omitted.

[0269] An insulating material piece is disposed between the pole body 21 and the first shell wall 111 to achieve insulation between the first shell wall 111 and the pole body 21, thereby preventing the first shell wall 111 from being charged. For example, the insulating material piece can be a part of the pole component 2 (such as the insulating structure 23) and is insulated from the pole body 21.

[0270] The structure of the housing component 1 is not limited. Figure 4 The shell component 1 includes a shell body 11 that participates in forming an accommodating cavity 13. One end of the shell body 11 has an opening 113. The shell body 11 includes a first shell wall 111. For example, the end of the shell body 111 opposite to the opening 113 is the first shell wall 111, or the shell wall (such as the second shell wall 114) adjacent to the opening 113 of the shell body 111 is used as the first shell wall 111. For example, in combination with Figure 7 The housing component 1 includes a housing cover 12 that participates in forming an accommodating cavity 13, and the housing cover 12 is a first housing wall 111. Therefore, the structural design of the housing component 1 is flexible, and the arrangement position of the pole component 2 is flexible.

[0271] When the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, illustratively, Figure 4 and Figure 5 The shell component 1 may include a shell body 11 and a shell cover 12, one end of the shell body 11 has an opening 113, the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 together form a accommodating cavity 13, and the end of the shell body 11 opposite to the opening 113 serves as a first shell wall 111; or, exemplarily, the shell component 1 may include two shell bodies 11, one end of each shell body 11 has an opening 113, the openings 113 of the two shell bodies 11 are opposite to and cover each other, the two shell bodies 11 together form a accommodating cavity 13, and the end of one shell body 11 opposite to the opening 113 serves as the first shell wall 111.

[0272] When the shell cover 12 is the first shell wall 111, illustratively, in combination with Figure 7 and Figure 8The shell component 1 may include a shell body 11 and a shell cover 12, one end of the shell body 11 has an opening 113, the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 together form an accommodating cavity 13, and the shell cover 12 serves as a first shell wall 111; or, illustratively, the shell component 1 may include a shell body 11 and two shell covers 12, both ends of the shell body 11 have openings 113, each opening 113 is covered with a shell cover 12, the two shell covers 12 and the shell body 11 together form an accommodating cavity 13, and one of the shell covers 12 serves as the first shell wall 111.

[0273] In some embodiments of the present application, Figure 4 and Figure 5 The shell component 1 includes a shell body 11 that participates in forming an accommodating cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111. It can be understood that the shell body 11 is an integral part, that is, the shell body 11 is an integrally formed part, and includes a first shell wall 111 and a second shell wall 114. The second shell wall 114 surrounds the edge of the first shell wall 111, and the second shell wall 114 extends from the edge of the first shell wall 111 toward one side in the thickness direction of the first shell wall 111. The end of the second shell wall 114 that is away from the first shell wall 111 defines the opening 113, and a cavity is defined between the first shell wall 111 and the second shell wall 114, and the cavity constitutes at least part of the accommodating cavity 13.

[0274] When the shell component 1 includes a shell body 11 with an opening 113 at one end, the shell component 1 also includes a shell body matching structure, which matches the shell body 11 to cover the opening 113 and together with the shell body 11, encloses a accommodating chamber 13. For example, the shell body 11 is in a semi-closed cylindrical shape, and the shell body matching structure is in a flat plate shape, that is, the shell body matching structure can be a shell cover 12. At this time, the shell component 1 can be a combination of the shell body 11 and the shell cover 12. For another example, the shell body 11 is in a semi-closed cylindrical shape, and the shell body matching structure can be a semi-closed cylindrical shape, that is, the shell body matching structure can be the other half of the shell body 11. At this time, the shell component 1 can be a combination of two shell bodies 11, etc. For another example, the shell body matching structure can be a shell group, which is composed of multiple parts. As a result, the shell component has various forms and can adapt to a variety of application scenarios.

[0275] In the above technical solution, since the electrode component 3 accommodated in the shell component 1 is connected to the pole component 2 installed on the first shell wall 111, when the battery 100 vibrates or deforms, the pole components 2 connected by the busbar component will be pulled against each other. Since the pole component 2 is arranged on the end wall of the shell body 11 opposite to the opening 113, the force acting on the pole component 2 will be preferentially transmitted to the shell body 11, and will not directly act on the shell body matching structure (such as the shell cover 12). Therefore, not only can the distance for the force to be transmitted to the connection between the shell body 11 and the shell body matching structure (such as the shell cover 12) be extended, but also the shell body 11 will preferentially deform when subjected to force, so as to reduce the force at the connection between the shell body 11 and the shell body matching structure (such as the shell cover 12), thereby effectively reducing the probability of cracking at the connection between the shell body 11 and the shell body matching structure (such as the shell cover 12) during the use of the battery 100, and improving the reliability of the battery cell 102. Furthermore, since the connection position between the shell body 11 and the shell body matching structure (such as the shell cover 12) is not prone to cracking, there is no need to increase the wall thickness of the two in order to increase the reliability of the connection between the two, which is beneficial to reducing weight and material costs, and is beneficial to miniaturizing the battery cell 102, or improving the energy density of the battery cell 102. The connection method between the shell body 11 and the shell body matching structure is not limited, for example, it can be bonding, welding, etc.

[0276] The material of the housing component 1 is not limited, for example, including but not limited to aluminum shell, steel shell, aluminum-plastic film, plastic or other materials resistant to electrolyte corrosion.

[0277] Next, a method for assembling the battery cell 102 according to some embodiments of the present invention is described.

[0278] Please refer to Fig. 9 , Fig. 9 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application. In some embodiments of the present application, the battery cell 102 assembly method may include the following steps.

[0279] Step S20, connecting the electrode component 3 to the pole component 2.

[0280] Exemplarily, the electrode component 3 includes a pole ear portion 33, and the pole component 2 includes a pole body 21, and "step S20, connecting the electrode component 3 with the pole component 2" can be specifically: "directly or indirectly connecting the pole ear portion 33 with the pole body 21" to achieve electrical conduction between the electrode component 3 and the pole component 2.

[0281] Please refer to Figures 10A-10D , Figures 10A-10DAn exploded view of the assembly process of a battery cell provided in one embodiment of the present application. Exemplarily, the pole ear portion 33 is directly connected to the pole body 21. For example, the pole ear portion 33 and the pole body 21 can be directly connected by welding (such as laser welding, resistance welding, pressure welding, or brazing), punching, bonding, etc.

[0282] Please refer to Figure 12A-12E , Figure 13A-13E , Figure 12A-12E An exploded view of the assembly process of a battery cell provided by one embodiment of the present application; Figure 13A-13E An exploded view of the assembly process of a battery cell provided for one embodiment of the present application. Exemplarily, the pole ear portion 33 may be indirectly connected to the pole body 21 via a conductive member 41. At this time, "step S20, connecting the electrode component 3 to the pole component 2" may include at least one of the steps of "connecting the conductive member 41 to the pole ear portion 33" and "connecting the conductive member 41 to the pole body 21". For example, the conductive member 41 and the pole ear portion 33 may be directly connected by welding (such as laser welding, resistance welding, pressure melting welding, or brazing, etc.), punching, bonding, etc. For example, the conductive member 41 and the pole body 21 may be directly connected by welding (such as laser welding, resistance welding, pressure melting welding, or brazing, etc.), punching, bonding, etc.

[0283] Step S30 , installing the pole component 2 connected to the electrode component 3 to the first shell wall 111 .

[0284] The pole component 2 can be in various forms. It can be an integral and inseparable form of the incoming material, or it can be a form in which the incoming material is in multiple parts and then assembled. Therefore, "step S30, installing the pole component 2 connected to the electrode component 3 to the first shell wall 111" should be understood in a broad sense, that is, the part connecting the pole component 2 and the electrode component 3 can be assembled to the first shell wall 111.

[0285] Please refer again Figures 10A-10D , Figure 12A-12E , Figure 13A-13E For example, when the pole component 2 does not need to be assembled, "step S20, connecting the electrode component 3 with the pole component 2; step S30, installing the pole component 2 connected to the electrode component 3 to the first shell wall 111" can be specifically: "first connect the pole component 2 with the electrode component 3, and then install the pole component 2 to the first shell wall 111 (for example, cover the pole component 2 at the mounting hole 112 on the first shell wall 111, and then connect the pole component 2 to the first shell wall 111, such as welding, riveting, or bonding)".

[0286] Please refer to Figures 0103A-0103D, which are exploded views of the assembly process of a battery cell provided in an embodiment of the present application, or exemplarily, when the pole component 2 needs to be assembled, "step S20, connecting the electrode component 3 to the pole component 2; step S30, installing the pole component 2 connected to the electrode component 3 to the first shell wall 111" can also be: "first complete the connection of a part of the pole component 2 (for example, the first pole component 21a) with the electrode component 3, and the remaining part of the pole component 2 (for example, the second pole component 21b) with the first shell wall 111, and then combine and connect the above two parts of the pole component 2 (for example, the first pole component 21a and the second pole component 21b)".

[0287] In the above technical solution, since the connection between the electrode component 3 and the pole component 2 is completed first, and then the pole component 2 and the shell component 1 are assembled and connected, rather than the pole component and the shell component are pre-installed first, and then the electrode component and the pole component are connected, it is beneficial to shorten the length of the conductive part 4 connecting the pole component 2 and the electrode component 3, reduce the redundancy of the conductive part 4 in the shell component 1, and reduce the space occupied by the conductive part 4 in the shell component 1, which is beneficial to improve the energy density of the battery cell 102, and is beneficial to reduce the risk of the conductive part 4 being inserted into the active material coating part 32 of the electrode component 3 and causing a short circuit, thereby improving the reliability of the battery cell 102. In addition, this assembly method can realize the assembly of the battery cell 102 regardless of whether the pole component 2 is set on the shell body 11 or the pole component 2 is set on the shell cover 12, so the installation position of the pole component 2 can be flexibly selected on the shell component 1. Among them, when the pole component 2 is set on the shell body 11, it is beneficial to reduce the cracking problem at the connection between the shell body 11 and the shell cover 12, and improve the reliability of the battery cell 102.

[0288] For example, in combination Figure 4 and Figure 5 , when the shell component 1 includes a shell body 11 and a shell cover 12, the shell body 11 has an opening 113, the shell cover 12 covers the opening 113, the end wall of the shell body 11 opposite to the opening 113 is used as a first shell wall 111, the first shell wall 111 has a mounting hole 112, and the pole component 2 is mounted at the mounting hole 112 of the first shell wall 111. If the pole component 2 is first mounted at the mounting hole 112 of the first shell wall 111, and then the electrode component 3 is installed in the shell body 11, it is difficult to connect the electrode component 3 with the pole component 2. In the embodiment of the present application, by first connecting the electrode component 3 with the pole component 2, and then connecting the pole component 2 with the shell component 1, the connection requirements of the electrode component 3 and the pole component 2 can be met, and the connection requirements of the pole component 2 and the shell component 1 can also be met.

[0289] When the battery 100 vibrates or deforms, the pole parts 2 connected by the busbar parts will be pulled against each other. Since the pole parts 2 are arranged on the first shell wall 111 of the shell body 11 opposite to the opening 113, the force applied to the pole parts 2 will be preferentially transmitted to the shell body 11, and will not directly act on the shell cover 12, so that not only can the distance for the force to be transmitted to the connection (such as the weld) of the shell body 11 and the shell cover 12 be extended, but also the shell body 11 will preferentially deform when subjected to force, so as to reduce the force applied to the connection (such as the weld) of the shell body 11 and the shell cover 12, thereby effectively reducing the probability of cracking at the connection (such as the weld) of the shell cover 12 and the shell body 11 during the use of the battery 100, and improving the reliability of the battery cell 102. In addition, since the connection (such as the weld) of the shell body 11 and the shell cover 12 is not easy to crack, there is no need to increase the wall thickness of the two in order to increase the reliability of the connection between the two, which is conducive to reducing weight and material costs.

[0290] For example, in combination Figure 7 , when the shell component 1 includes a shell body 11 and a shell cover 12, the shell body 11 has an opening 113, the shell cover 12 covers the opening 113, the shell cover 12 serves as a first shell wall 111, the first shell wall 111 has a mounting hole 112, and the pole component 2 is mounted at the mounting hole 112 of the first shell wall 111. If the pole component 2 is first mounted on the shell cover 12, and then the pole component 2 and the electrode component 3 are connected, when the pole component 2 and the electrode component 3 are connected, the length of the conductive part 4 needs to be set relatively long (for example, greater than half the width of the shell cover 12), so that the electrode component 3 can be located on one side in the width direction of the shell cover 12, so that the length of the conductive part 4 is longer, and the redundancy of the conductive part 4 after assembly is more, which is easy to cause the risk of reverse insertion into the active material coating part 32 and causing a short circuit. In the embodiment of the present application, the pole component 2 and the electrode component 3 are first connected and then the pole component 2 is installed on the shell cover 12. Therefore, when the pole component 2 and the electrode component 3 are connected, the length of the conductive part 4 is such that the electrode component 3 can be located on one side in the width direction of the pole component 2, thereby shortening the length of the conductive part 4 (for example, greater than half the width of the pole component 2), reducing the redundancy of the conductive part 4 after assembly, reducing the risk of the conductive part 4 being inserted into the active material coating part 32 and causing a short circuit, thereby improving the reliability of the battery cell 102 and reducing the material and cost of the conductive part 4.

[0291] In summary, according to the assembly method of the battery cell 102 of the embodiment of the present application, the assembly position of the pole component 2 on the shell component 1 is not limited, and the pole component 2 can be set on the shell body 11 or on the shell cover 12. The installation position of the pole component 2 can be flexibly selected on the shell component 1, which is conducive to meeting the production requirements of different types of battery cells 102. Among them, when the pole component 2 is set on the shell body 11, it is conducive to improving the cracking problem at the connection between the shell body 11 and the shell cover 12, and improving the reliability of the battery cell 102. Among them, when the pole component 2 is set on the shell cover 12, it is conducive to shortening the length of the conductive part 4, reducing the redundancy of the conductive part 4 after assembly, reducing the risk of reverse insertion, and improving the reliability of the battery cell 102.

[0292] In some embodiments of the present application, Figure 4 and Figure 7 The pole component 2 includes a pole body 21, an adapter structure 22 and an insulating structure 23. The electrode component 3 is connected to the pole body 21. The adapter structure 22 surrounds the pole body 21 and is connected to the first shell wall 111. The insulating structure 23 is insulated and matched between the adapter structure 22 and the pole body 21. The adapter structure 22 surrounds the pole body 21 along the circumference of the mounting hole 112, so that the adapter structure 22 can play a role in connecting the pole body 21 and the first shell wall 111 in the outer peripheral area of ​​the pole body 21. The insulating structure 23 insulates the matching position of the adapter structure 22 and the pole body 21 to prevent the pole body 21 and the adapter structure 22 from being electrically short-circuited. There is no limit to the connection method between the adapter structure 22 and the first shell wall 111, for example, welding, riveting, punching, bonding, etc.

[0293] Please refer to Fig.14 , Fig.14 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application, and again referring to Figures 10A-10D , Figure 12A-12E , Figure 13A-13E ; In some embodiments of the present application, when the pole component 2 includes the above-mentioned pole body 21, the adapter structure 22 and the insulating structure 23, "step S20, connecting the electrode component 3 to the pole component 2" may specifically include: "step S20a, connecting the electrode component 3 to the pole body 21"; "step S30, installing the pole component 2 connected to the electrode component 3 to the first shell wall 111" may specifically include: "step S30a, setting the pole component 2 connected to the electrode component 3 at the mounting hole 112, and connecting the adapter structure 22 to the first shell wall 111".

[0294] In the above technical solution, the pole component 2 has a simple structure and is easy to process. Since it includes two parts, namely the pole body 21 and the adapter structure 22, the shape and size of the pole body 21 and the shape and size of the adapter structure 22 can be designed separately based on different factors, so as to flexibly adapt to the connection requirements with different forms of shell components 1 and electrode components 3, thereby increasing the scope of application of the pole component 2.

[0295] Please refer to Fig.15 , Fig.15 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application, and again referring to Figures 10A-10D ; Exemplarily, “step S20a, connecting the electrode component 3 to the pole body 21” may specifically include: “step S211, placing the electrode component 3 and the conductive part 4 connected to the electrode component 3 on the inner side of the first shell wall 111, and passing the conductive part 4 through the mounting hole 112 to the outer side of the first shell wall 111”; “step S212, connecting the conductive part 4 passing through the outer side of the first shell wall 111 to the pole body 21 of the pole component 2 placed on the outer side of the first shell wall 111”.

[0296] Among them, "the inner side of the first shell wall 111" refers to: the side of the first shell wall 111 in the thickness direction facing the active material coating part 32; "the outer side of the first shell wall 111" refers to: the side of the first shell wall 111 in the thickness direction away from the active material coating part 32. Therefore, since the conductive part 4 is not connected to the pole component 2 when passing through the mounting hole 112, it is convenient for the conductive part 4 to pass through the mounting hole 112, thereby improving the convenience of operation. Moreover, since the welding position between the pole component 2 and the conductive part 4 is located on the outside of the first shell wall 111, the problem of conductive chips formed during welding entering the interior of the shell body 11 and causing damage to the electrode component 3 can be improved.

[0297] Exemplarily, the mounting hole 112 is an elongated hole (e.g., rectangular, oval, track-shaped, etc.), and the portion of the conductive part 4 that needs to pass through the mounting hole 112 is an elongated shape that matches the shape of the mounting hole 112. At this time, the thickness direction of the portion of the conductive part 4 can be adjusted to match the width direction of the mounting hole 112, and the length direction of the portion of the conductive part 4 is at an angle to the length direction of the mounting hole 112. Thus, the portion of the conductive part 4 can pass through the mounting hole 112 smoothly, thereby improving assembly efficiency and reducing the risk of collision and scratching between the conductive part 4 and the housing component 1. However, the present application is not limited thereto, and the mounting hole 112 and the portion of the conductive part 4 that needs to pass through the mounting hole 112 can also be processed into other shapes, such as a circle, a polygon, and the like. "Track-shaped" is an elongated circle, in which the elongated circle can be generally considered to be composed of a rectangle and two semicircles, and the outline shape of the elongated circle can be generally considered to be the outline shape of the rectangle after the two short sides of the rectangle are replaced by two arcs.

[0298] For further information, please refer to Fig.16 , Fig.16 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application, and again referring to Figures 10A-10D "Step S30a, set the pole component 2 connected to the electrode component 3 at the mounting hole 112, and connect the adapter structure 22 to the first shell wall 111" may specifically include: "Step S311, set the pole component 2 connected to the conductive part 4 at the mounting hole 112 from the outer side of the first shell wall 111, so that the adapter structure 22 stops at the outer side of the first shell wall 111"; "Step S312, connect the adapter structure 22 to the first shell wall 111 from the outer side of the first shell wall 111". Among them, the adapter structure 22 stops at the outer side of the first shell wall 111, which means that the adapter structure 22 is partially supported on the side of the first shell wall 111 away from the active material coating part 32.

[0299] Therefore, since the pole component 2 is covered on the mounting hole 112 from the outside of the first shell wall 111, the adapter structure 22 stops at the outside of the first shell wall 111, and the adapter structure 22 is connected to the first shell wall 111 from the outside of the first shell wall 111, so as to facilitate the assembly and connection of the pole component 2 and the first shell wall 111, which is beneficial to improve the connection reliability of the pole component 2 and the first shell wall 111.

[0300] For example, reference Figures 10A-10D When assembling the battery cell 102, the multi-layered pole tab sheets 311 in the pole tab portion 33 can be connected to form a gathered portion 313, and then the electrode component 3 is placed inside the first shell wall 111, and the gathered portion 313 is passed through the mounting hole 112 to the outside of the first shell wall 111, and the gathered portion 313 is connected to the pole column component 2 placed outside the first shell wall 111 on the outside of the first shell wall 111, and then the pole column component 2 connected with the gathered portion 313 is covered in the mounting hole 112 from the outside of the first shell wall 111, and then the adapter structure 22 is welded to the first shell wall 111 from the outside of the first shell wall 111. The processing steps of this embodiment are applicable to both the scenario where the shell cover 12 serves as the first shell wall 111 and the scenario where the shell body 11 includes the first shell wall 111.

[0301] For example, please refer to Fig.17 , Fig.17 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application, and again referring to Figures 10A-10DWhen the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, "step S211, placing the electrode component 3 and the conductive part 4 connected to the electrode component 3 on the inner side of the first shell wall 111, and passing the conductive part 4 through the mounting hole 112 to the outer side of the first shell wall 111" may specifically include: "step S2111, adjusting the relative positions of the shell body 11, the electrode component 3 and the conductive part 4 so that the electrode component 3 is located on the side of the conductive part 4 connected thereto away from the shell body 11, and the opening 113 of the shell body 11 faces the conductive part", "step S2112, installing the electrode component 3 and the conductive part 4 into the shell body 11". Therefore, by arranging the pole component 2 at the end of the shell body 11 opposite to the opening 113, it is helpful to improve the cracking problem at the connection between the shell body 11 and the shell cover 12, and improve the reliability of the battery cell 102.

[0302] Among them, "step S2111, adjusting the relative positions of the shell body, the electrode component and the conductive part so that the electrode component is located on the side of the conductive part connected thereto away from the shell body", can be achieved by adjusting the position of the shell body 11, or by adjusting the positions of the electrode component and the conductive part. "step S2112, inserting the electrode component and the conductive part into the shell body", can be achieved by pushing the electrode component, or by inserting the shell body.

[0303] Exemplarily, the action of the conductive part 4 passing through the mounting hole 112 to the outside of the first shell wall 111 can be achieved as the electrode component 3 is installed into the shell body 11. That is, the action of the conductive part 4 passing through the mounting hole 112 is completed as the electrode component 3 is installed into the shell, making the operation convenient and improving the processing efficiency.

[0304] For example, reference Figures 10A-10D When assembling the battery cell 102, the multi-layered pole ear sheets 311 in the pole ear portion 33 can be connected to form a gathered portion 313, and then the electrode component 3 is installed into the shell body 11 in the direction of the gathered portion 313 relative to the active material coating portion 32 toward the mounting hole 112. As the electrode component 3 moves into the shell body 11, the gathered portion 313 passes through to the outside of the mounting hole 112, and the gathered portion 313 is connected to the pole column component 2 disposed on the outside of the first shell wall 111 on the outside of the first shell wall 111. Then, the pole column component 2 connected with the gathered portion 313 is covered on the mounting hole 112 from the outside of the first shell wall 111, and then the pole column component 2 covering the mounting hole 112 is welded to the first shell wall 111.

[0305] Please refer to Figures 18A-18G , Figures 18A-18G This is an exploded view of the assembly process of a battery cell provided in one embodiment of the present application, and please refer to Fig.19 , Fig.19A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application. Exemplarily, when the shell cover 12 is the first shell wall 111, "step S211, placing the electrode component 3 and the conductive part 4 connected to the electrode component 3 on the inner side of the first shell wall 111, and passing the conductive part 4 through the mounting hole 112 to the outer side of the first shell wall 111" and "step S30a, setting the pole component 2 connected to the electrode component 3 at the mounting hole 112, and connecting the adapter structure 22 to the first shell wall 111" also include: "step S43, putting the shell body 11 outside the electrode component 3", "step S44, connecting the shell body 11 to the shell cover 12".

[0306] Among them, "step S212, connecting the conductive part 4 penetrating the outside of the first shell wall 111 with the pole body 21 of the pole component 2 disposed outside the first shell wall 111" can be performed after "step S44, connecting the shell body 11 with the shell cover 12" (for example Figures 18A-18G as shown); or, in other embodiments of the present application, "step S212, connecting the conductive portion 4 extending outward from the first shell wall 111 to the pole body 21 of the pole component 2 disposed on the outside of the first shell wall 111" may also be performed before "step S43, putting the shell body 11 outside the electrode component 3".

[0307] Thus, by first completing the connection between the shell body 11 and the shell cover 12, and then connecting the pole component 2 to the shell cover 12, the shell body 11 can be used to store the electrode component 3 and support the shell cover 12, so that it is convenient to position and support the shell cover 12, so as to facilitate the connection between the shell cover 12 and the adapter structure 22, and improve the connection reliability between the shell cover 12 and the pole component 2. Among them, the connection method of the shell body 11 and the shell cover 12 is not limited, for example, it can be welding, bonding, etc.

[0308] Please refer again Figures 18A-18G , and please refer to Fig. 20 , Fig. 20A flowchart of the steps of the assembly method of the battery cell provided for some embodiments of the present application. In some embodiments of the present application, when the shell cover 12 is the first shell wall 111, the inner side of the shell cover 12 may have an insulating bracket 121, and "step S20a, connecting the electrode component 3 to the pole body 21" may also include "step S41, placing the electrode component 3 so that the conductive part 4 connected to it faces downward, and placing the shell cover 12 so that the insulating bracket 121 faces upward", "step S42, covering the electrode component 3 supported on the top of the insulating bracket 121 with an insulating film 7, so that the insulating film 7 is connected to the insulating bracket 121". "Step S43, covering the shell body 11 outside the electrode component 3" specifically includes: "step S431, placing the shell body 11 so that the opening 113 faces downward, and covering the shell body 11 from top to bottom on the outside of the electrode component 3 covered with the insulating film 7".

[0309] Among them, "step S41, placing the electrode component 3 so that the conductive part 4 connected to it faces downward, and placing the shell cover 12 so that the insulating bracket 121 faces upward" can be performed before "step S211, placing the electrode component 3 and the conductive part 4 connected to the electrode component 3 on the inner side of the first shell wall 111, and passing the conductive part 4 through the mounting hole 112 to the outer side of the first shell wall 111" (that is, the conductive part 4 can be passed through first, and then the relative positions of the two can be placed), or, it can also be performed after "step S211, placing the electrode component 3 and the conductive part 4 connected to the electrode component 3 on the inner side of the first shell wall 111, and passing the conductive part 4 through the mounting hole 112 to the outer side of the first shell wall 111" (that is, the relative positions of the two can be placed first, and then the conductive part 4 can be passed downward).

[0310] Among them, “step S42, covering the insulating film 7 on the electrode component 3 supported on the top of the insulating support 121, so that the insulating film 7 is connected to the insulating support 121” is performed when the insulating support 121 is supported on the bottom of the active material coating part 32, and the conductive part 4 passes through the mounting hole 112 to the outside of the first shell wall 111. Because in this state, the electrode component 3 does not need other clamps to support and limit, which is conducive to quick operation.

[0311] In the above technical solution, when the shell body 11 is inserted into the outer surface of the electrode component 3, since the shell cover 12 is not connected to the electrode component 3, an insulating bracket 121 is provided on the inner side of the shell cover 12 (i.e., the side away from the active material coating portion 32) to support the electrode component 3 from the bottom of the electrode component 3. In this way, no other limiting clamps are required, and the problem of separation of the electrode component 3 and the shell cover 2 can be avoided. Therefore, during assembly, the shell body 11 only needs to be directly inserted from top to bottom, thereby simplifying the assembly process and reducing the use of limiting clamps and the like.

[0312] Please refer again Figures 18A-18G , and combined with Fig.21 , Fig.21 A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments of the present application, when the shell cover 12 is the first shell wall 111, when assembling the battery cell 102, the following steps can be performed in sequence: "Step S41, placing the electrode component 3 so that the conductive part 4 connected thereto faces downward, and placing the shell cover 12 so that the insulating support 121 faces upward", "Step S211, placing the electrode component 3 and the conductive part 4 connected to the electrode component 3 on the inner side of the first shell wall 111, and passing the conductive part 4 through the mounting hole 112 to the outer side of the first shell wall 111", "Step S42, covering the electrode component 3 supported on the top of the insulating support 121 with an insulating film 7, so that the insulating film 7 and the insulating support 121 are in contact with each other. 1 connection", "Step S431, place the shell body 11 so that the opening 113 faces downward, and put the shell body 11 on the outside of the electrode component 3 covered with the insulating film 7 from top to bottom", "Step S44, connect the shell body 11 with the shell cover 12", "Step S212, connect the conductive part 4 that passes through the outside of the first shell wall 111 with the pole body 21 of the pole component 2 placed on the outside of the first shell wall 111", "Step S311, cover the pole component 2 connected to the conductive part 4 from the outside of the first shell wall 111 to the mounting hole 112, so that the adapter structure 22 stops at the outside of the first shell wall 111", "Step S312, connect the adapter structure 22 and the first shell wall 111 from the outside of the first shell wall 111".

[0313] For example, please refer again to Figures 18A-18GWhen assembling the battery cell 102, a plurality of electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure), and the stacked plurality of electrode assemblies 31 are bundled with a bundle 8 (e.g., blue glue), and the multi-layered pole tabs 311 of the plurality of electrode assemblies 31 with the same polarity are stacked and gathered to form a stacked portion 312, and the stacked portion 312 is sandwiched between the two clamping portions 4110 of the conductive member 41, and the stacked portion 312 and the clamping portion 4110 are welded and connected, thereby obtaining a structure consisting of the pole tab portion 33 and the conductive member 41. The conductive part 4 is composed of components 41, the shell cover 12 is placed below the active material coating part 32, and the shell cover 12 is placed so that the insulating support 121 faces upward, the active material coating part 32 is supported above the insulating support 121, and then the insulating film 7 is covered on the outside of the active material coating part 32, and the lower end of the insulating film 7 is hot-melt connected to the insulating support 121; then, the shell body 11 is placed so that the opening 113 faces downward, the shell body 11 is put on the outside of the active material coating part 32 from top to bottom, and the lower end of the shell body 11 is welded to the shell cover 12. Afterwards, the shell body 11 is laid flat, the mounting hole 112 is opened in the horizontal direction, the conductive part 4 is connected to the pole component 2 placed on the outside of the shell cover 12 on the outside of the shell cover 12, and then the pole component 2 connected to the conductive part 4 is covered in the mounting hole 112 from the outside of the shell cover 12; then the shell body 11 is turned over so that the shell cover 12 is located above the shell body 11, the pole component 2 is located on the top of the shell cover 12, and the adapter structure 22 is welded and fixed to the shell cover 12.

[0314] Please refer to Fig. 22 , Fig. 22 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application, and reference Figure 23A-23D , Figure 23A-23D An exploded diagram of the assembly process of a battery cell provided for an embodiment of the present application; illustratively, "step S30a, setting the pole component 2 connected to the electrode component 3 at the mounting hole 112, and connecting the adapter structure 22 to the first shell wall 111" may specifically include: "step S321, passing the pole component 2 connected to the electrode component 3 from the inner side of the first shell wall 111 through the mounting hole 112 to the outer side of the first shell wall 111"; "step S322, covering the pole component 2 that has passed through the outer side of the first shell wall 111 with the mounting hole 112 from the outer side of the first shell wall 111, so that the adapter structure 22 stops at the outer side of the first shell wall 111"; "step S323, connecting the adapter structure 22 to the first shell wall 111 from the outer side of the first shell wall 111".

[0315] The “inner side of the first shell wall 111” refers to the side of the first shell wall 111 facing the active material coating portion 32 in the thickness direction of the first shell wall 111; the “outer side of the first shell wall 111” refers to the side of the first shell wall 111 away from the active material coating portion 32 in the thickness direction of the first shell wall 111. The transition structure 22 stops at the outer side of the first shell wall 111, which means that the transition structure 22 is partially supported on the side of the first shell wall 111 away from the active material coating portion 32.

[0316] Therefore, since the electrode component 3 and the pole component 2 are connected first and then the pole component 2 is passed through the mounting hole 112, there is no need to consider avoiding the first shell wall 111 when connecting the electrode component 3 and the pole component 2, or in other words, when connecting the electrode component 3 and the pole component 2, the pole component 2 and the electrode component 3 are not located on both sides of the first shell wall 111, which is conducive to further shortening the length of the conductive part 4, reducing the redundancy of the conductive part 4 after assembly, reducing the risk of reverse insertion, and improving the reliability of the battery cell 102. In addition, since the welding position of the pole component 2 and the electrode component 3 is located outside the shell body 11, the problem of conductive chips formed during welding entering the inside of the shell body 11 and causing damage to the electrode component 3 can be improved. Furthermore, since the pole component 2 is covered on the mounting hole 112 from the outside of the first shell wall 111, the adapter structure 22 is stopped at the outside of the first shell wall 111, and the adapter structure 22 is connected to the first shell wall 111 from the outside of the first shell wall 111, so as to facilitate the assembly and connection of the pole component 2 and the first shell wall 111, which is beneficial to improve the connection reliability of the pole component 2 and the first shell wall 111.

[0317] For example, in combination Figure 23A-23D When assembling the battery cell 102, the multi-layered pole tab sheets 311 in the pole tab portion 33 may be connected to form a gathered portion 313, and then the gathered portion 313 may be connected to the pole column component 2, and the pole column component 2 connected with the gathered portion 313 may be passed through the mounting hole 112 from the inner side of the first shell wall 111 to the outer side of the first shell wall 111, and then the pole column component 2 connected with the gathered portion 313 may be covered in the mounting hole 112 from the outer side of the first shell wall 111, and then the pole column component 2 covered in the mounting hole 112 may be welded to the first shell wall 111. The processing steps of this embodiment are applicable to both the scenario where the shell cover 12 serves as the first shell wall 111 and the scenario where the shell body 11 includes the first shell wall 111.

[0318] Please refer to Fig.25 , Fig.25 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application, and again referring to Figure 23A-23DIn some embodiments of the present application, the mounting hole 112 is a long strip hole (e.g., rectangular, elliptical, racetrack-shaped, etc.), and the pole component 2 is formed into a long strip structure that matches the shape of the mounting hole 112. "Step S321, passing the pole component 2 connected to the electrode component 3 from the inner side of the first shell wall 111 through the mounting hole 112 to the outer side of the first shell wall 111" may specifically include: "Step S3213, adjusting the placement angle of the pole component 2, so that the thickness direction of the pole component 2 matches the width direction of the mounting hole 112, and the length direction of the pole component 2 forms an angle with the length direction of the mounting hole 112", "Step S3214, passing the pole component 2 from the mounting hole 112 to the outer side of the first shell wall 111 according to the placement angle".

[0319] Thus, by first adjusting the placement angle of the pole component 2 and then passing the pole component 2 through the mounting hole 112, the pole component 2 can be smoothly passed through the mounting hole 112, thereby improving assembly efficiency and reducing the risk of collision and scratching between the pole component 2 and the shell component 1. Moreover, by setting the pole component 2 as a long strip structure matching the shape of the mounting hole 112, the pole component 2 can be adjusted to pass through the mounting hole 112 at an angle close to the width direction of the mounting hole 112 in its thickness direction. After passing through the mounting hole 112, the thickness direction of the pole component 2 is rotated to be close to the thickness direction of the first shell wall 111, so that the space required for the flipping movement of the pole component 2 is small, which can reduce the space required for the flipping of the pole component 2, thereby shortening the length of the conductive part 4, saving materials, reducing costs, and reducing the redundancy of the conductive part 4, reducing the space occupied by the conductive part 4 in the accommodating cavity 13, which is conducive to improving the energy density of the battery cell 102. However, the present application is not limited to this, and the mounting hole 112 and the pole component 2 can also be processed into other shapes, such as circular, polygonal, etc.

[0320] Please refer to Fig.26 , Fig.26 Schematic diagram of assembly of mounting holes and pole components provided in some embodiments of the present application (eg Fig.26 It can be understood that the pole component 2 passes through the mounting hole 112 in a direction perpendicular to the paper surface); illustratively, making the length direction of the pole component 2 and the length direction of the mounting hole 112 form an angle can be specifically: making the length direction of the pole component 2 match the diagonal direction of the mounting hole 112. Therefore, by placing the length direction of the pole component 2 as above, it is conducive to the pole component 2 to pass through the mounting hole 112 smoothly, improve assembly efficiency, and reduce the risk of collision and scratching between the pole component 2 and the housing component 1.

[0321] Please refer to Fig. 27 , Fig. 27 Schematic diagram of assembly of mounting holes and pole components provided in other embodiments of the present application (eg Fig. 27It can be understood that the pole component 2 passes through the mounting hole 112 along the direction of the arrow); or illustratively, the length direction of the pole component 2 is at an angle to the length direction of the mounting hole 112. Specifically, the length direction of the pole component 2 extends from one end of the length of the mounting hole 112 to the other end of the length, and is inclined to the length direction of the mounting hole 112. Therefore, by placing the length direction of the pole component 2 as above, it is conducive to the smooth passage of the pole component 2 through the mounting hole 112, improving the assembly efficiency and reducing the risk of collision and scratching between the pole component 2 and the housing component 1.

[0322] Please refer to Fig.28 , Fig.28 A flow chart of the steps of the battery cell assembly method provided for some embodiments of the present application. In some embodiments of the present application, when the end of the shell body 11 opposite to the opening 113 is the first shell wall 111; "Step S321, pass the pole component 2 connected to the electrode component 3 from the inner side of the first shell wall 111 through the mounting hole 112 to the outer side of the first shell wall 111" may specifically include: "Step S3211, adjust the relative positions of the shell body 11, the electrode component 3 and the pole component 2, so that the electrode component 3 is located on the side of the pole component 2 connected to it away from the shell body 11, and the opening 113 of the shell body 11 faces the pole component 2"; "Step S3212, install the electrode component 3 and the pole component 2 into the shell body".

[0323] In the above technical solution, by arranging the pole component 2 at the end of the shell body 11 opposite to the opening 113 , it is helpful to improve the cracking problem at the connection between the shell body 11 and the shell cover 12 , and improve the reliability of the battery cell 102 .

[0324] In some embodiments of this application, please refer to Fig.28 , "Step S321, pass the pole component 2 connected to the electrode component 3 from the inner side of the first shell wall 111 through the mounting hole 112 to the outer side of the first shell wall 111" can specifically include the following steps: "Step S3211, adjust the relative positions of the shell body 11, the electrode component 3 and the pole component 2 so that the electrode component 3 is located on the side of the pole component 2 connected to it away from the shell body 11, and the opening 113 of the shell body 11 faces the pole component 2", "Step S3212, install the electrode component 3 and the pole component 2 into the shell body", "Step S3213, adjust the placement angle of the pole component 2 so that the thickness direction of the pole component 2 matches the width direction of the mounting hole 112, and the length direction of the pole component 2 forms an angle with the length direction of the mounting hole 112", and "Step S3214, pass the pole component 2 through the mounting hole 112 to the outer side of the first shell wall 111 according to the placement angle". That is, after the electrode component 3 and the pole component 2 are installed into the shell body, the placement angle of the pole component 2 is adjusted.

[0325] The execution order of “step S321, passing the pole component 2 connected to the electrode component 3 from the inner side of the first shell wall 111 through the mounting hole 112 to the outer side of the first shell wall 111” is not limited to the above embodiment, please refer to Fig.29 , Fig.29 The step flow chart of the assembly method of the battery cell provided for some embodiments of the present application can also be performed in the following order, for example, "step S3211, adjust the relative positions of the shell body 11, the electrode component 3 and the pole component 2, so that the electrode component 3 is located on the side of the pole component 2 connected thereto away from the shell body 11, and the opening 113 of the shell body 11 faces the pole component 2", "step S3213, adjust the placement angle of the pole component 2, so that the thickness direction of the pole component 2 matches the width direction of the mounting hole 112, and the length direction of the pole component 2 forms an angle with the length direction of the mounting hole 112", "step S3212, install the electrode component 3 and the pole component 2 into the shell body", "step S3214, make the pole component 2 pass through the mounting hole 112 to the outside of the first shell wall 111 according to the placement angle". That is, before installing the electrode component 3 and the pole component 2 into the shell body, first adjust the placement angle of the pole component 2.

[0326] For example, please refer to Figures 30A-30D , Figures 30A-30D An exploded view of the assembly process of a battery cell provided in an embodiment of the present application; when the end wall of the shell body 11 opposite to the opening 113 is used as the first shell wall 111, when assembling the battery cell 102, the multi-layered pole ear sheets 311 in the pole ear portion 33 can be connected to form a retracted portion 313, and then the retracted portion 313 can be connected to the pole column component 2, and then the pole column component 2 is placed on the side of the electrode component 3 close to the mounting hole 112, so as to install the pole column component 2 and the electrode component 3 into the shell body 11, and as the pole column component 2 and the electrode component 3 are connected, the pole column component 2 and the electrode component 3 are connected to the shell body 11. The movement of the pole component 3 into the shell body 11 causes the pole column component 2 to move close to the mounting hole 112. At this time, the placement angle of the pole column component 2 can be adjusted to the above state, and then the pole component 3 is continued to be pushed into the shell body 11, so that the pole column component 2 that meets the placement angle can pass through the mounting hole 112, and then the pole column component 2 connected with the retracted portion 313 is covered on the mounting hole 112 from the outer side of the first shell wall 111, and then the pole column component 2 covering the mounting hole 112 is connected to the first shell wall 111.

[0327] Exemplarily, the movement of the pole component 2 passing through the mounting hole 112 can be completed along with the movement of the electrode component 3 entering the shell, thereby facilitating the operation and improving the processing efficiency.

[0328] Please refer to Figures 31A-31D , and combined with Fig.32 and Fig.33 , Figures 31A-31D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application; Fig.32 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application; Fig.33 A flow chart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments of the present application, when the shell cover is the first shell wall 111, after "step S321, passing the pole component 2 connected to the electrode component 3 from the inner side of the first shell wall 111 through the mounting hole 112 to the outer side of the first shell wall 111", it may also include: "step S43, putting the shell body 11 on the outside of the electrode component 3", "step S44, connecting the shell body 11 to the shell cover 12".

[0329] Among them, “step S322, cover the pole component 2 that passes through the outside of the first shell wall 111 in the mounting hole 112 from the outside of the first shell wall 111, so that the adapter structure 22 stops at the outside of the first shell wall 111”; “step S323, connect the adapter structure 22 and the first shell wall 111 from the outside of the first shell wall 111” can be performed after “step S44, connect the shell body 11 and the shell cover 12” (for example Fig.32 As shown), in this way, since the connection between the shell body 11 and the shell cover 12 is completed first, and then the pole component 2 is connected to the shell cover 12, the shell body 11 can be used to support the shell cover 12, which makes it easy to position and support the shell cover 12, so as to facilitate the connection between the shell cover 12 and the adapter structure 22, thereby improving the connection reliability between the shell cover 12 and the pole component 2.

[0330] Alternatively, in other embodiments of the present application, “step S322, cover the pole component 2 that passes through the outside of the first shell wall 111 on the mounting hole 112 from the outside of the first shell wall 111, so that the adapter structure 22 stops at the outside of the first shell wall 111”; “step S323, connect the adapter structure 22 and the first shell wall 111 from the outside of the first shell wall 111” can also be performed before “step S43, cover the shell body 11 outside the electrode component 3” (for example, Fig.33 As shown), when the pole component 2 and the shell cover 12 are connected, since the shell body 11 and the shell cover 12 are not yet connected, the force of connecting the pole component 2 and the shell cover 12 will not be transmitted to the connection between the shell body 11 and the shell cover 12, thereby improving the cracking problem at the connection between the shell body 11 and the shell cover 12.

[0331] There is no limitation on the connection method between the shell body 11 and the shell cover 12 , for example, welding, bonding, etc. may be used.

[0332] Please combine Figure 34A-Figure 34D , and refer to Fig.35 , Figure 34A-Figure 34D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application; Fig.35A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application. In some embodiments of the present application, "step S30a, setting the pole component 2 connected to the electrode component 3 at the mounting hole 112, and connecting the adapter structure 22 to the first shell wall 111" may specifically include: "step S331, placing the pole component 2 connected to the electrode component 3 and the electrode component 3 on the inner side of the first shell wall 111"; "step S332, setting the pole component 2 connected to the electrode component 3 on the mounting hole 112 from the inner side of the first shell wall 111, so that the adapter structure 22 stops at the inner side of the first shell wall 111"; "step S333, connecting the adapter structure 22 to the first shell wall 111 from the outer side of the first shell wall 111".

[0333] In the above technical solution, since the pole component 2 is covered in the mounting hole 112 from the inner side of the first shell wall 111, the conductive part 4 and the pole component 2 do not need to pass through the mounting hole 112, thereby reducing the processing steps and reducing the difficulty of operation. Moreover, since the adapter structure 22 is connected to the first shell wall 111 from the outer side of the first shell wall 111, it is convenient to assemble and connect the pole component 2 and the first shell wall 111, which is conducive to improving the connection reliability between the pole component 2 and the first shell wall 111. In addition, since the electrode component 3 and the pole component 2 are connected first, and then the pole component 2 and the electrode component 3 are placed on the inner side of the first shell wall 111, it is not necessary to consider avoiding the first shell wall 111 when connecting the electrode component 3 and the pole component 2, or in other words, when connecting the electrode component 3 and the pole component 2, the pole component 2 and the electrode component 3 are not located on both sides of the first shell wall 111, which is conducive to further shortening the length of the conductive part 4, reducing the redundancy of the conductive part 4 after assembly, reducing the risk of reverse insertion, and improving the reliability of the battery cell 102. Furthermore, since the welding position between the pole component 2 and the electrode component 3 is located outside the shell body 11 , the problem of conductive scraps formed during welding entering the shell body 11 and damaging the electrode component 3 can be improved.

[0334] For example, in combination Figure 34A-Figure 34D When assembling the battery cell 102, the multi-layered pole tab sheets 311 in the pole tab portion 33 may be connected to form a gathered portion 313, and then the gathered portion 313 may be connected to the pole column component 2, and the pole column component 2 connected with the electrode component 3 and the electrode component 3 may be placed inside the first shell wall 111, and then the pole column component 2 connected with the electrode component 3 may be covered in the mounting hole 112 from the inside of the first shell wall 111, and then the pole column component 2 covered in the mounting hole 112 may be connected to the first shell wall 111. Exemplarily, the processing steps of this embodiment are applicable to both the scenario where the shell cover 12 serves as the first shell wall 111 and the scenario where the shell body 11 includes the first shell wall 111.

[0335] Please refer to Figure 36A-Figure 36D , and combined with Fig.37 , Figure 36A-Figure 36D An exploded view of the assembly process of a battery cell provided by one embodiment of the present application; Fig.37 A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application. In some embodiments of the present application, when the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, "step S331, placing the pole component 2 connected to the electrode component 3 and the electrode component 3 on the inner side of the first shell wall 111" may specifically include: "step S3311, adjusting the relative positions of the shell body 11, the electrode component 3 and the pole component 2 so that the electrode component 3 is located on the side of the pole component 2 connected to it away from the shell body 11, and the opening 113 of the shell body 11 faces the pole component 2", "step S3312, installing the electrode component 3 and the pole component 2 into the shell body 11".

[0336] Therefore, by arranging the pole component 2 in the shell body 11 , it is helpful to improve the cracking problem at the connection between the shell body 11 and the shell cover 12 , and improve the reliability of the battery cell 102 .

[0337] For example, please refer to Figure 36A-Figure 36D When the end wall of the shell body 11 opposite to the opening 113 serves as the first shell wall 111, when assembling the battery cell 102, the multi-layered pole ear sheets 311 in the pole ear portion 33 can be connected to form a retracted portion 313, and then the retracted portion 313 is connected to the pole column component 2, and then the pole column component 2 is placed on the side of the electrode component 3 close to the mounting hole 112, so that the electrode component 3 and the pole column component 2 are installed into the shell body 11, and as the pole column component 2 and the electrode component 3 are installed into the shell body 11, the pole column component 2 moves to a position close to the mounting hole 112. At this time, the pole column component 2 can be adjusted to present an angle that can cover the mounting hole 112, and then the electrode component 3 is continuously pushed into the shell body 11, so that the pole column component 2 can cover the mounting hole 112 from the inner side of the first shell wall 111, and then the pole column component 2 arranged at the mounting hole 112 and the first shell wall 111 are welded from the outer side of the first shell wall 111. In this way, the action of covering the mounting hole 112 of the pole component 2 is completed together with the action of inserting the electrode component 3 into the shell, which makes the operation convenient and improves the processing efficiency.

[0338] Please refer to Fig.38 , Fig.38 A flow chart of the steps of the battery cell assembly method provided for some embodiments of the present application; when the shell cover 12 is the first shell wall 111, "step S333, connecting the adapter structure 22 and the first shell wall 111 from the outside of the first shell wall 111" may also include the following steps: "step S43, putting the shell body 11 on the outside of the electrode component 3", "step S44, connecting the shell body 11 to the shell cover 12".

[0339] Thus, by first completing the connection between the pole component 2 and the shell cover 12, and then assembling and connecting the shell body 11 and the shell cover 12, when connecting the pole component 2 and the shell cover 12, since the shell body 11 has not been sleeved on the outside of the electrode component 3, it can contact the electrode component 3, and the pole component 2 is stopped on the shell cover 12 by applying a force to the electrode component 3, or the conductive part 4 can be lengthened to directly apply a force to the pole component 2 from the inside of the shell cover 12, so that the pole component 2 is stopped on the shell cover 12, so that the pole component 2 and the shell cover 12 can be reliably and effectively connected. Among them, the connection method of the shell body 11 and the shell cover 12 is not limited, for example, it can be welding, bonding, etc.

[0340] Please refer to Figure 39-40 , Fig.39 A top view of a battery cell provided for some embodiments of the present application; Fig.40 For along Fig.39 Cross-sectional view along the AA line; in some embodiments of the present application, the insulating structure 23 is also sealed and matched between the adapter structure 22 and the pole body 21. Therefore, the insulating structure 23 can not only insulate the adapter structure 22 from the pole body 21, but also make the matching position of the adapter structure 22 and the pole body 21 present a sealed state, so as to isolate the inside and outside of the shell component 1 after the adapter structure 22 is connected to the first shell wall 111, reduce the risk of the electrolyte in the shell component 1 leaking from the matching position of the adapter structure 22 and the pole body 21 to the outside of the shell component 1, and reduce the risk of liquid or dust outside the shell component 1 entering the shell component 1 from the matching position of the adapter structure 22 and the pole body 21, thereby improving the reliability of the battery cell 102.

[0341] In the above technical solution, since the insulating structure 23 is also sealed and matched between the transition structure 22 and the pole body 21, when the pole component 2 is installed on the first shell wall 111 and the transition structure 22 and the first shell wall 111 are connected, there is no need to set a seal between the transition structure 22 and the first shell wall 111, and there is no need to apply a large sealing pressure to meet the compression degree of the seal there, so that the force on the first shell wall 111 can be reduced, and the role of protecting the shell component 1 can be played, which is conducive to reducing the wall thickness of the shell component 1 and reducing material costs. In addition, when the first shell wall 111 is the end of the shell body 11 opposite to the opening 113, the force at the connection between the first shell wall 111 and the second shell wall 114 can be reduced, and the force on the second shell wall 114 can be reduced, which is conducive to ensuring the reliability of the shell body 11 and reducing the wall thickness and cost of the shell body 11.

[0342] Please refer to Figure 39-40In some embodiments of the present application, the insulating structure 23 includes a sealing structure 231. In the embodiments of the present application, the sealing structure 231 is made of a material that has both sealing and insulating properties, such as an elastic rubber member. At least a portion of the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 in the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111.

[0343] In the embodiment of the present application, the direction from the inner side of the first shell wall 111 to the outer side of the first shell wall 111, and the direction from the outer side of the first shell wall 111 to the inner side of the first shell wall 111 are collectively referred to as “inside-outside directions of the first shell wall 111 (e.g., the fifth direction F5)”. “Inside of the first shell wall 111” refers to the side of the first shell wall 111 facing the electrode component 3, and “outside of the first shell wall 111” refers to the side of the first shell wall 111 facing away from the electrode component 3.

[0344] The sealing structure 231 at least includes a shaft side portion 231a, the side of the shaft side portion 231a facing the accommodating cavity 13 is the inner side of the shaft side portion 231a, and the side of the shaft side portion 231a away from the electrode component 3 is the outer side of the shaft side portion 231a, and one of the transition structure 22 and the pole body 21 is partially clamped on the outer side of the shaft side portion 231a, and the other part is clamped on the inner side of the shaft side portion 231a, so that the shaft side portion 231a is clamped between the transition structure 22 and the pole body 21 in the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) to achieve axial sealing between the transition structure 22 and the pole body 21.

[0345] Thus, by setting at least part of the sealing structure 231 to be clamped between the transition structure 22 and the pole body 21 in the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111, an axial seal between the transition structure 22 and the pole body 21 is achieved, and the axial seal can achieve a more reliable sealing effect, thereby improving the leakage problem at the matching position of the transition structure 22 and the pole body 21. Moreover, the embodiment of the present application can reduce the axial force on the first shell wall 111 by integrating the axial seal (e.g., the shaft side portion 231a) into the pole component.

[0346] Please refer to Figure 41-44 , Fig.41 A schematic diagram of a pole component provided for some embodiments of the present application; Fig.42 for Fig.41 A top view of the pole component shown in ; Fig.43 For along Fig.42 The view from direction B shown in FIG. Fig.44 For along Fig.42Cross-sectional view along the CC line; illustratively, the sealing structure 231 is arranged around the peripheral side of the adapter structure 22 facing the pole body 21 (i.e., the inner ring of the adapter structure 22). In the embodiment of the present application, since the adapter structure 22 is arranged around the pole body 21 and is connected to the first shell wall 111, the peripheral side of the adapter structure 22 facing the pole body 21 is the "inner ring 2211 of the adapter structure 22", and the peripheral side of the adapter structure 22 facing the first shell wall 111 is the "outer ring 2212 of the adapter structure 22". In the above technical solution, by arranging the sealing structure 231 around the inner ring of the adapter structure 22, the sealing structure 231 can be close to the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily realizing compression sealing thereof, and the seal is not easy to fail, thereby improving the sealing effect.

[0347] Please refer again Figure 41-44 Exemplarily, when the insulating structure 23 includes a sealing structure 231, the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 so that the transition structure 22 and the pole body 21 are sealed together, and the transition structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is arranged at the length center position of the transition structure 22 and is circular, since the connection position of the transition structure 22 and the pole body 21 is subjected to uniform force, it is easy to control the compression amount of the sealing structure 231 to improve the reliability of the sealing cooperation between the transition structure 22 and the pole body 21, and the sealing area is relatively small and not easy to fail.

[0348] Please refer to Fig.45 , Fig.45 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application; and Figure 39-Figure 44 In some embodiments of the present application, before "step S20a, connecting the electrode component 3 to the pole body 21", it may also include: "step S50, providing the pole component 2", so that the pole component 2 includes the pole body 21, the adapter structure 22 and the insulating structure 23, the electrode component 3 is connected to the pole body 21, the adapter structure 22 surrounds the pole body 21 and is connected to the first shell wall 111, the insulating structure 23 is insulated and fitted between the adapter structure 22 and the pole body 21, and the insulating structure 23 includes a sealing structure 231, which is arranged on the peripheral side of the adapter structure 22 facing the pole body 21, and is at least partially clamped between the adapter structure 22 and the pole body 21 in the inner and outer directions of the first shell wall 111.

[0349] Therefore, before "step S20a, connecting the electrode component 3 with the pole body 21", the pole component 2 is first processed into the form of sealing between the above transition structure 22 and the pole body 21 through the sealing structure 231, so that in the subsequent "step S30a, setting the pole component 2 connected to the electrode component 3 at the mounting hole 112, and connecting the transition structure 22 with the first shell wall 111", no sealing member is required between the transition structure 22 and the first shell wall 111, and no large sealing pressure is required to meet the compression degree of the sealing member at this location, thereby reducing the stress on the first shell wall 111. In addition, when the first shell wall 111 is the end of the shell body 11 opposite to the opening 113, it is also possible to reduce the stress at the connection between the first shell wall 111 and the second shell wall 114, and reduce the stress on the second shell wall 114, which is conducive to ensuring the reliability of the shell body 11 and reducing the wall thickness and cost of the shell body 11.

[0350] For example, the pole component 2 used in the battery cell 102 processed by the assembly method of any of the above embodiments can be in the form of the sealing structure 231 in this embodiment. For example, as shown in FIG. 11 (the conductive portion 4 of the electrode component 3 first passes through the mounting hole 112, the conductive portion 4 is welded to the pole component 2 outside the mounting hole 112, and the pole component 2 is then covered with the mounting hole 112 from the outside of the first shell wall 111), or Figure 30A-28 D (the electrode component 3 and the pole component 2 are welded first, and after the pole component 2 passes through the mounting hole 112, the mounting hole 112 is covered from the outer side of the first shell wall 111), or Figure 34A-32 As shown in D (the electrode component 3 and the pole component 2 are welded first, the pole component 2 does not pass through the mounting hole 112, and the mounting hole 112 is covered from the inner side of the first shell wall 111), the pole component 2 including the sealing structure 231 in this embodiment can be used.

[0351] Please refer to Fig.44 and Fig.46 , Fig.46A flowchart of the steps of the assembly method of the battery cell provided for some embodiments of the present application. In some embodiments of the present application, the pole body 21 includes a peripheral portion 212, and the transition structure 22 is clamped on both sides of the peripheral portion 212 in the inner and outer directions of the first shell wall 111 through the insulating structure 23, and at least part of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the electrode component 3 and the transition structure 22; "Step S50, providing the pole component 2" can specifically include: "Step S51, assembling or shaping the transition structure 22 to complete the clamping of the peripheral portion 212 and the transition structure 22 on the sealing structure 231". Therefore, it is only necessary to operate the transition structure 22 without operating the pole body 21, so as to complete the provision of the pole component 2, thereby simplifying the operation, making the processing of the pole component 2 easy, and simply and effectively realizing the relative fixation and insulation matching of the pole body 21 and the transition structure 22.

[0352] refer to Fig.44 The peripheral portion 212 may be the outer peripheral structure of the pole body 21 . Since the sealing structure 231 is arranged around the peripheral side of the transition structure 22 facing the pole body 21 , the sealing structure 231 may be clamped between the peripheral portion 212 and the transition structure 22 . The side of the peripheral portion 212 facing away from the electrode component 3 is the outer side of the peripheral portion 212, and the side of the peripheral portion 212 facing the accommodating cavity 13 is the inner side of the peripheral portion 212. The transition structure 22 is limited on the outer side of the peripheral portion 212 by the insulating structure 23 to limit the movement of the pole body 21 relative to the transition structure 22 in the direction away from the electrode component 3. The transition structure 22 is also limited on the inner side of the peripheral portion 212 by the insulating structure 23 to limit the movement of the pole body 21 relative to the transition structure 22 toward the accommodating cavity 13, thereby achieving the transition structure 22 being clamped on both sides of the peripheral portion 212 in the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the insulating structure 23.

[0353] In the above technical solution, the sealing structure 231 is clamped by the peripheral portion 212 of the pole body 21 and the transition structure 22, so that the sealing structure 231 can be in the matching position of the transition structure 22 and the pole body 21, which is conducive to sealing the matching position of the transition structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily achieving compression sealing on it, and the seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the electrode component 3 and the transition structure 22, the sealing structure 231 can be sealed from the side of the peripheral portion 212 facing the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking out of the matching position of the pole body 21 and the transition structure 22, thereby improving the sealing effect.

[0354] Please refer again Fig.44 , illustratively, the insulating structure 23 further includes a first insulating member 232, and the transition structure 22 is clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 through the first insulating member 232 and the sealing structure 231. In this embodiment, the transition structure 22 is not limited in composition, and can be a single part or a combination of multiple parts (e.g., two or more).

[0355] Since at least a portion of the sealing structure 231 (such as the axial side portion 231a) is arranged on the side of the peripheral portion 212 facing the electrode component 3, at least a portion of the first insulating member 232 is arranged on the side of the peripheral portion 212 away from the electrode component 3, and the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the first insulating member 232 and the sealing structure 231 respectively.

[0356] In the above technical solution, since the insulating structure 23 includes the first insulating member 232 and the sealing structure member 231 which are not integrated into one piece, the design and processing of the insulating structure 23 can be simplified. Moreover, according to the specific matching requirements with the pole body 21 and the adapter structure 22, the first insulating member 232 can be set as an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the first insulating member 232 can be set as a compressible sealing member that has a sealing effect (such as an elastic rubber member), so as to meet different actual requirements. In addition, when the first insulating member 232 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure member 231 and improve the sealing effect.

[0357] Alternatively, in some other embodiments of the present application, the sealing structure 231 can also be an integral structure and outsource the peripheral portion 212, so as to be respectively located on the side of the peripheral portion 212 facing the electrode component 3 and the side away from the electrode component 3, and the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions of the first shell wall 111 by the sealing structure 231. That is, the sealing structure 231 is an integral annular structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a respectively located on the inner and outer sides of the peripheral portion 212, so that the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions of the first shell wall 111 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure and outsources the peripheral portion 212, it is possible to reduce parts and assembly processes.

[0358] Please refer again Fig.44In some embodiments of the present application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is arranged on the side of the first adapter ring 221 away from the electrode component 3. The second adapter ring 222 is connected to the first adapter ring 221, and the first adapter ring 221 is connected to the first shell wall 111. The sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232.

[0359] For example, the first adapter ring 221 and the second adapter ring 222 can be connected by welding, riveting, punching, or bonding. For example, the first adapter ring 221 and the first shell wall 111 are welded, riveted, punched, or bonded. Exemplarily, the first adapter ring 221 and the second adapter ring 222 are both made of aluminum and welded, and the first adapter ring 221 and the first shell wall 111 are both made of aluminum and welded, which is beneficial to improving the welding yield.

[0360] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 which are arranged inside and outside and assembled and connected, so as to facilitate the assembly connection between the adapter structure 22 and the insulating structure 23 and the pole body 21, so that the pole component 2 is easy to process and manufacture, and it is easy to control the compression amount of the sealing structure 231, thereby improving the sealing reliability.

[0361] The second adapter ring 222 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232 in any manner.

[0362] For example, refer again to Fig.44 The first insulating member 232 and the second adapter ring 222 can be connected by injection molding to insulate the peripheral portion 212. For example, when processing the pole component 2, the pole body 21 and the second adapter ring 222 can be connected by injection molding to obtain the first insulating member 232, and then the sealing structure 231 and the first adapter ring 221 are assembled, and then the first adapter ring 221 and the second adapter ring 222 are connected (such as welded) to press the sealing structure 231.

[0363] For another example, please refer to Fig.47 , Fig.47A cross-sectional view of a pole component provided in some embodiments of the present application; the second adapter ring 222 may include a stop ring portion 2221, and at least a portion of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111, wherein the material of the first insulating member 232 is not limited, and may be, for example, a plastic member or an elastic rubber member. For example, when processing the pole component 2, the pole body 21, the sealing structure 231 and the first adapter ring 221 may be assembled first, and then the first insulating member 232 and the second adapter ring 222 may be assembled, and then the first adapter ring 221 and the second adapter ring 222 may be connected (e.g., welded) to press the sealing structure 231.

[0364] Please refer again Fig.44 , exemplarily, the adapter structure 22 further includes a first insulating frame 224, and the first insulating frame 224 is connected to the side of the first adapter ring 221 facing the electrode component 3. Therefore, the first insulating frame 224 can be used to insulate between the electrode component 3 and the first adapter ring 221, reducing the difficulty of setting the insulation structure here. Exemplarily, the first insulating frame 224 has a plug, and the first adapter ring 221 has a socket, and the plug is inserted into the socket by interference fit to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0365] Please refer to Fig.48 and Fig.49 , Fig.48 A cross-sectional view of a pole component provided in some embodiments of the present application, Fig.49 A cross-sectional view of a pole component provided in some embodiments of the present application; in some embodiments of the present application, the adapter structure 22 includes a third adapter ring 223, and the third adapter ring 223 includes an integrally arranged inner extension portion 2231 and an outer extension portion 2232. That is, the inner extension portion 2231 and the outer extension portion 2232 are different parts of an integral piece, rather than two separate parts assembled and connected.

[0366] The end of the inner extension 2231 facing the pole body 21 (i.e., the inner ring of the inner extension 2231) and the end of the outer extension 2232 facing the pole body 21 (i.e., the inner ring of the outer extension 2232) are spaced in the inner-outer direction, so as to be clamped on both sides of the peripheral portion 212 along the inner-outer direction (e.g., the fifth direction F5) of the first shell wall 111 by the insulating structure 23. The sealing structure 231 is clamped between the inner extension 2231 and the peripheral portion 212, and the outer extension 2232 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232.

[0367] The third adapter ring 223 and the first shell wall 111 may be connected in any manner, such as welding, riveting, punching, bonding, etc. For example, the third adapter ring 223 and the first shell wall 111 are both made of aluminum and welded, which is beneficial to improving welding yield.

[0368] The outer extension portion 2232 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232 in any manner.

[0369] For example, refer again to Fig.48 , the outer extension part 2232 rivets the first insulating member 232 against the peripheral portion 212, wherein the material of the first insulating member 232 is not limited, for example, it can be a plastic member or an elastic rubber member. For example, when processing the pole component 2, the pole body 21, the sealing structure 231 and the third adapter ring 223 can be assembled first, and then the outer extension part 2232 of the third adapter ring 223 is riveted, so that the outer extension part 2232 rivets the first insulating member 232 against the peripheral portion 212, and presses the sealing structure 231.

[0370] For another example, please refer to Fig.49 , the first insulating member 232 and the pole body 21, and the first insulating member 232 and the outer extension 2232 are respectively connected by injection molding, and the inner extension 2231 rivets the sealing structure 231 against the peripheral portion 212. For example, when processing the pole component 2, the pole body 21 and the third adapter ring 223 can be firstly connected by injection molding to obtain the first insulating member 232, and then the sealing structure 231 is assembled, and then the outer extension 2232 of the third adapter ring 223 is riveted, so that the outer extension 2232 rivets the sealing structure 231 against the peripheral portion 212.

[0371] For example, please refer again to Fig.49 The adapter structure 22 further includes a second insulating frame 225, which is connected to the side of the third adapter ring 223 facing the electrode component 3. Therefore, the second insulating frame 225 can be used to insulate between the electrode component 3 and the third adapter ring 223, eliminating the need to provide an insulating structure. Exemplarily, the second insulating frame 225 has a plug, and the third adapter ring 223 has a socket, and the plug is inserted into the socket by interference fit to achieve the connection between the second insulating frame 225 and the third adapter ring 223.

[0372] Please refer to Fig.50 , Fig.50An exploded view of the processing process of the third adapter ring provided for some embodiments of the present application; illustratively, when the adapter structure 22 includes the third adapter ring 223, and the third adapter ring 223 has an inner extension portion 2231 and an outer extension portion 2232, the steps of shaping the adapter structure 22 may be: first providing a metal plate, then punching a bulge out of the metal plate, then thinning the peripheral edge outside the bulge to obtain one of the inner extension portion 2231 and the outer extension portion 2232, and then punching a hole at the position of the bulge to obtain the other of the inner extension portion 2231 and the outer extension portion 2232.

[0373] Please refer to Fig.51 , Fig.51 2 is an exploded view of the processing process of the pole component provided in some embodiments of the present application; illustratively, when the pole component 2 is manufactured using the third adapter ring 223, the third adapter ring 223 is manufactured first, for example, Fig.50 In the manner shown, the third adapter ring 223 is then connected to the pole body 21 by injection molding to obtain the first insulating member 232, and then the sealing structure 231 is assembled, and then the inner extension 2231 is pressed against the sealing structure 231 by a riveting process, and finally the second insulating frame 225 is assembled to the third adapter ring 223. Thus, by shaping the third adapter ring 223, the clamping of the sealing structure 231 by the peripheral portion 212 and the inner extension 2231 of the adapter structure 22 is completed.

[0374] Please refer to Fig.52 and Fig.53 , Fig.52 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application; Fig.53 A partial cross-sectional view of a battery cell provided for some embodiments of the present application. In some embodiments of the present application, the adapter structure 22 includes a matching ring portion 2271, the pole body 21 includes a penetration portion 214 penetrated through the matching ring portion 2271, and an inner limit portion 215 and an outer limit portion 216 connected to the penetration portion 214 and clamped on both sides of the matching ring portion 2271, and at least part of the sealing structure 231 is clamped between the matching ring portion 2271 and the inner limit portion 215; "Step S50, providing the pole component 2" may specifically include: "Step S52, assembling or shaping the pole body 21 to complete the clamping of the sealing structure 231 by the matching ring portion 2271 and the pole body 21". Therefore, only the pole body 21 needs to be operated, without operating the adapter structure 22, to complete the provision of the pole component 2, thereby simplifying the operation, making the processing of the pole component 2 easy, and simply and effectively achieving the relative fixation and insulation matching of the pole body 21 and the adapter structure 22.

[0375] In the above technical solution, the sealing structure 231 is clamped by the matching position of the pole body 21 and the matching ring portion 2271, so that the sealing structure 231 can be in the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily achieving compression sealing on it, and the seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the matching ring portion 2271 and the inner limit portion 215, the sealing structure 231 can be sealed from the side of the matching ring portion 2271 facing the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking out of the matching position of the pole body 21 and the adapter structure 22, thereby improving the sealing effect.

[0376] refer to Fig.53 The adapter structure 22 includes a fourth adapter ring 227, the fourth adapter ring 227 includes a matching ring portion 2271, and the fourth adapter ring 227 is connected to the first shell wall 111, for example, the outer ring of the fourth adapter ring 227 is connected to the first shell wall 111. The connection method between the fourth adapter ring 227 and the first shell wall 111 is not limited, for example, welding, riveting, punching, bonding, etc. Exemplarily, the fourth adapter ring 227 and the first shell wall 111 are both made of aluminum and are welded, which is conducive to improving the welding yield.

[0377] Please refer again Fig.53 The insulating structure 23 may further include a second insulating member 234 , wherein at least a portion of the sealing structure member 231 is clamped between the inner limiting portion 215 and the mating ring portion 2271 , and at least a portion of the second insulating member 234 is clamped between the outer limiting portion 216 and the mating ring portion 2271 .

[0378] In the above technical solution, since the insulating structure 23 includes the second insulating member 234 and the sealing structure 231 which are not integrated into one piece, the design and processing of the insulating structure 23 can be simplified. Moreover, according to the specific matching requirements with the pole body 21 and the adapter structure 22, the second insulating member 234 can be set as an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the second insulating member 234 can be set as a compressible sealing member that has a sealing effect (such as an elastic rubber member), so as to meet different actual requirements. In addition, when the second insulating member 234 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure 231 and improve the sealing effect.

[0379] Please combine Fig.54 , Fig.54A partial cross-sectional view of a battery cell provided in some embodiments of the present application; or, in some other embodiments of the present application, the sealing structure 231 can also be an integral structure and surround the matching ring portion 2271, so as to be respectively located on the side of the matching ring portion 2271 facing the electrode component 3 and the side away from the electrode component 3, and the pole body 21 is clamped on both sides of the matching ring portion 2271 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the sealing structure 231. That is, the sealing structure 231 is an integral annular structure, which has both insulation and sealing properties, and the sealing structure 231 includes shaft side portions 231a respectively located on the inner and outer sides of the matching ring portion 2271, so that the transition structure 22 can be clamped on both sides of the matching ring portion 2271 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the two shaft side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integrated structure and surrounds the matching ring portion 2271, the number of parts and the number of assembly steps can be reduced.

[0380] In an embodiment of the present application, when the pole body 21 includes a penetration portion 214, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetration portion 214 and clamped on both sides of the mating ring portion 2271, the structure of the pole body 21 is not limited, and it can be a single part or a combination of multiple parts (such as two or more).

[0381] Please refer again Fig.53 ; Exemplarily, the outer limiting portion 216 and the penetration portion 214 are assembled and connected on the side of the matching ring portion 2271 away from the inner limiting portion 215. There is no limit to the way of assembling and connecting the outer limiting portion 216 and the penetration portion 214, such as welding, punching, adhesive connection, etc., and the assembly connection refers to the connection of two parts together through a connection process. Thus, the outer limiting portion 216 and the penetration portion 214 are set as separate parts and assembled and connected, and the structure of the pole body 21 is simple and easy to assemble and connect with the adapter structure 22. In addition, when the outer limiting portion 216 and the penetration portion 214 are welded, the thermal impact on the sealing structure 231 clamped between the inner limiting portion 215 and the matching ring portion 227 can be reduced, thereby improving the sealing reliability of the sealing structure 231.

[0382] In the above embodiment, the connection method between the penetration portion 214 and the inner limiting portion 215 is not limited, and can be an integral part, or can be a split part and pre-connected together. Exemplarily, the end of the penetration portion 214 that is away from the inner limiting portion 215 can include a riveted portion 2141. During assembly, the penetration portion 214 can be penetrated along the direction from the inner limiting portion 215 to the outer limiting portion 216 through the matching ring portion 2271 with the insulating structure 23, and then the riveted portion 2141 is riveted to limit the penetration portion 214 from coming out along the direction from the outer limiting portion 216 to the inner limiting portion 215. After that, the riveted portion 2141 can be connected to the outer limiting portion 216, so as to facilitate the connection between the penetration portion 214 and the outer limiting portion 216, such as welding. Alternatively, the riveted portion 2141 can be omitted, and the riveting process after the penetration of the penetration portion 214 is omitted.

[0383] Please combine Fig.54 and Fig.55 , Fig.55 A partial cross-sectional view of a battery cell provided for some embodiments of the present application; in some other embodiments of the present application, the outer limiting portion 216 and the penetration portion 214 are an integral part, and the outer limiting portion 216 rivets the second insulating member 234 against the matching ring portion 2271. In the above technical solution, the assembly connection of the outer limiting portion 216 with the insulating structure 23 and the transition structure 22 is achieved by riveting, which reduces the thermal impact of the heat generated when the outer limiting portion 216 is connected with the insulating structure 23 and the transition structure 22 on the sealing structure 231, thereby improving the sealing reliability of the sealing structure 231. In addition, by riveting the outer limiting portion 216 to press the second insulating member 234 against the matching ring portion 2271, it is easy to control the compression amount of the sealing structure 231 and achieve a better compression effect.

[0384] In the above embodiment, the connection method between the penetration portion 214 and the inner limiting portion 215 is not limited, and can be an integral part (for example Fig.54 ), or may be separate pieces and pre-connected (e.g. Fig.55 As shown). For example, during assembly, the penetration portion 214 may be penetrated along the direction from the inner limiting portion 215 to the outer limiting portion 216 to form the matching ring portion 2271 matched with the insulating structure 23, and then the outer limiting portion 216 may be riveted to limit the relative movement between the pole component 21 and the adapter structure 22.

[0385] The pole body 21 is a solid structure (for example Fig.53 and Fig.55 As shown), it can also be a hollow structure (for example Fig.54 For example, please refer to Fig.54When the pole body 21 is a hollow structure, the pole body 21 includes a first pole piece 21a and a second pole piece 21b. The second pole piece 21b is composed of a penetration portion 214, an inner stop portion 215 and an outer stop portion 216, and is mounted on the first shell wall 111. The penetration portion 214 surrounds a matching hole 21b1 that penetrates along the inner and outer directions of the first shell wall 111. The first pole piece 21a is assembled on the side of the second pole piece 21b away from the electrode component 3 and covers the matching hole 21b1, so as to form a receiving space open toward the direction of the electrode component 3 between the first pole piece 21a and the second pole piece 21b. A part of the conductive part 4 can extend into the receiving space and be connected to the first pole piece 21a, so that the pole body 21 can play the role of accommodating the conductive part 4, so as to reduce the space occupied by the conductive part 4 in the receiving cavity 13, which is conducive to improving the energy density of the battery cell 102.

[0386] Please refer again Fig.53 In some embodiments of the present application, the adapter structure 22 further includes a third insulating frame 228, and the third insulating frame 228 is connected to the side of the fourth adapter ring 227 facing the electrode component 3. Therefore, the third insulating frame 228 can be used to insulate between the electrode component 3 and the fourth adapter ring 227, eliminating the need to set an insulating structure here. Exemplarily, the third insulating frame 228 has a plug, and the fourth adapter ring 227 has a socket, and the plug is inserted into the socket by interference fit to achieve the connection between the third insulating frame 228 and the fourth adapter ring 227.

[0387] Please combine Fig.56 and Fig.57 , Fig.56 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application; Fig.57 A partial cross-sectional view of a battery cell provided for some embodiments of the present application; a mounting hole 112 is provided on the first shell wall 111, a sealing ring 14 is arranged around the mounting hole 112, and the sealing ring 14 is clamped between the pole component 2 and the first shell wall 111; "Step S30a, disposing the pole component 2 connected to the electrode component 3 at the mounting hole 112, and connecting the adapter structure 22 to the first shell wall 111" may specifically include the steps: "Step S34, installing the sealing ring 14 at the mounting hole 112 of the first shell wall 111"; "Step S35, covering the pole component 2 connected to the electrode component 3 at the mounting hole 112, so that the sealing ring 14 is clamped between the pole component 2 and the first shell wall 111".

[0388] When the pole component 2 connected to the electrode component 3 is covered in the mounting hole 112 so that the sealing ring 14 is sandwiched between the pole component 2 and the first shell wall 111, the edge of the transition structure 22 overlaps one side of the wall thickness direction of the first shell wall 111. In this way, by covering the transition structure 22 on one side of the wall thickness direction of the first shell wall 111, that is, the transition structure 22 is covered on the outside of the first shell wall 111, or on the inside of the first shell wall 111, it is convenient to assemble the transition structure 22 with the first shell wall 111. Therefore, the pole component 2 has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall 111.

[0389] Exemplarily, the adapter structure 22 is connected to the first shell wall 111 by welding. For example, after the adapter structure 22 is covered on the first shell wall 111, the adapter structure 22 and the first shell wall 111 can be connected by welding, so as to facilitate processing and better ensure the connection reliability between the adapter structure 22 and the first shell wall 111. For example, welding can be performed from the outside of the first shell wall 111 so that the weld formed by the connection between the two is exposed on the side of the first shell wall 111 away from the electrode component 3 (i.e., the side away from the active material coating portion 32), so as to facilitate welding operation and increase welding space.

[0390] The execution order of "step S34, installing the sealing ring 14 at the mounting hole 112 of the first shell wall 111" can be flexibly set, and can be set before the conductive part 4 or the pole component 2 passes through the mounting hole 112, or can be set after the conductive part 4 or the pole component 2 passes through the mounting hole 112. When the pole component 2 needs to pass through the mounting hole (for example, as shown in FIG. 23), the execution order of "step S20a, connecting the electrode component 3 with the pole body 21" and "step S34, installing the sealing ring 14 at the mounting hole 112 of the first shell wall 111" is not limited, and can be performed one after the other or simultaneously.

[0391] Referring to Figure 10, in some embodiments, the "step S35, cover the pole component 2 connected to the electrode component 3 on the mounting hole 112 so that the sealing ring 14 is sandwiched between the pole component 2 and the first shell wall 111" in "cover the pole component 2 connected to the electrode component 3 on the mounting hole 112" can be specifically as: "step S311, cover the pole component 2 connected to the conductive part 4 on the mounting hole 112 from the outside of the first shell wall 111 so that the adapter structure 22 stops at the outside of the first shell wall 111". For example, referring to FIG. 10 , when assembling the battery cell 102, the following steps may be performed in sequence: “Step S34, installing the sealing ring 14 at the mounting hole 112 of the first shell wall 111”; “Step S211, placing the electrode component 3 and the conductive part 4 connected to the electrode component 3 on the inner side of the first shell wall 111, and passing the conductive part 4 through the mounting hole 112 to the outer side of the first shell wall 111”; “Step S212, passing the conductive part 4 passing through the outer side of the first shell wall 111”. Part 4 is connected to the pole body 21 of the pole component 2 placed on the outside of the first shell wall 111"; "Step S311, the pole component 2 connected to the conductive part 4 is covered on the mounting hole 112 from the outside of the first shell wall 111, so that the adapter structure 22 stops at the outside of the first shell wall 111", and the sealing ring 14 is clamped between the pole component 2 and the first shell wall 111; "Step S312, connect the adapter structure 22 and the first shell wall 111 from the outside of the first shell wall 111".

[0392] Alternatively, referring to Figure 23, in some embodiments, the "step S35, cover the pole component 2 connected to the electrode component 3 on the mounting hole 112 so that the sealing ring 14 is clamped between the pole component 2 and the first shell wall 111" in "cover the pole component 2 connected to the electrode component 3 on the mounting hole 112" can be specifically as: "step S322, cover the pole component 2 that passes through the outside of the first shell wall 111 on the mounting hole 112 from the outside of the first shell wall 111, so that the adapter structure 22 stops at the outside of the first shell wall 111". Exemplarily, referring to Figure 23, when assembling the battery cell 102, the following steps can be performed in sequence: "Step S20a, connect the electrode component 3 to the pole body 21"; "Step S34, install the sealing ring 14 at the mounting hole 112 of the first shell wall 111"; "Step S321, pass the pole component 2 connected to the electrode component 3 from the inner side of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111"; "Step S322, cover the pole component 2 that has passed through the outside of the first shell wall 111 on the mounting hole 112 from the outside of the first shell wall 111, so that the adapter structure 22 stops at the outside of the first shell wall 111", and the sealing ring 14 is clamped between the pole component 2 and the first shell wall 111; "Step S323, connect the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111".

[0393] Alternatively, in some embodiments, the "step S35, cover the pole component 2 connected to the electrode component 3 on the mounting hole 112 so that the sealing ring 14 is sandwiched between the pole component 2 and the first shell wall 111" in "cover the pole component 2 connected to the electrode component 3 on the mounting hole 112" can be specifically as: "step S332, cover the pole component 2 connected to the electrode component 3 on the mounting hole 112 from the inner side of the first shell wall 111 so that the adapter structure 22 stops at the inner side of the first shell wall 111".

[0394] In some embodiments of the present application, Figure 4 and Figure 5 , the transition structure 22 is formed into a long strip (e.g., a rectangular, elliptical, racetrack, etc.) extending along the length direction of the first shell wall 111, and the pole body 21 is arranged at the length center position of the transition structure 22 and is circular. Therefore, when the pole body 21 is arranged at the length center position of the long strip-shaped transition structure 22 and is circular, it is beneficial to reduce the connection area between the pole body 21 and the transition structure 22, and the connection force between the pole body 21 and the transition structure 22 can be evenly distributed on the circumference, thereby improving the force uniformity at the connection between the pole body 21 and the transition structure 22, thereby improving the connection reliability between the pole body 21 and the transition structure 22.

[0395] In some other embodiments of the present application, Fig.39 and Fig.40 , the transfer structure 22 is formed into a long strip (e.g., a rectangle, an ellipse, a racetrack, etc.) extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the transfer structure 22 (e.g., a rectangle, an ellipse, a racetrack, etc.). The electrode component 3 is connected to the pole component 2 through the conductive portion 4. When the contour shape of the pole body 21 is formed into a long strip that matches the contour shape of the transfer structure 22, the area of ​​the pole body 21 is large, which is conducive to increasing the connection area between the conductive portion 4 and the pole body 21, thereby improving the charging performance.

[0396] In some embodiments of the present application, Fig.58 , Fig.58 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application; before "step S20a, connecting the electrode component 3 to the pole body 21", it also includes: step S53, providing the pole body 21 and the transition structure 22; step S54, assembling the pole component 2. That is, providing the pole body 21 and the transition structure 22 of the required shape, and then assembling the pole body 21, the transition structure 22 and the insulating structure 23 together to obtain the pole component 2.

[0397] Exemplarily, when the insulating structure 23 includes a sealing structure 231, "step S50, providing a pole component 2" may include: step S53, providing a pole body 21 and a transition structure 22; step S54, assembling the pole component 2. Among them, "step S54, assembling the pole component 2" may specifically be: "step S51, assembling or shaping the transition structure 22 to complete the clamping of the sealing structure 231 by the peripheral portion 212 and the transition structure 22"; or, "step S54, assembling the pole component 2" may also specifically be "step S52, assembling or shaping the pole body 21 to complete the clamping of the sealing structure 231 by the matching ring portion 2271 and the pole body 21".

[0398] For example, in “step S311, the pole component 2 connected to the conductive part 4 is covered on the mounting hole 112 from the outer side of the first shell wall 111, so that the adapter structure 22 stops at the outer side of the first shell wall 111”; “step S312, the adapter structure 22 is connected to the first shell wall 111 from the outer side”, and in “step S321, the pole component 2 connected to the electrode component 3 is passed through the mounting hole 112 from the inner side of the first shell wall 111 to the first shell wall 111”. In the step S322, the pole component 2 that passes through the outside of the first shell wall 111 is covered on the mounting hole 112 from the outside of the first shell wall 111, so that the adapter structure 22 stops at the outside of the first shell wall 111; in the step S323, the adapter structure 22 and the first shell wall 111 are connected from the outside of the first shell wall 111, the edges of the adapter structure 22 can be overlapped on the side of the first shell wall 111 away from the electrode component 3. For example, reference Figures 11A-11D as well as Figures 30A-30D , a first recessed groove 1111 surrounding the mounting hole 112 may be provided on the first shell wall 111, the first recessed groove 1111 is open in a direction away from the electrode component 3 (that is, the first recessed groove 1111 is open in a direction away from the active material coating portion 32), and the edge of the adapter structure 22 is embedded in the first recessed groove 1111, wherein the edge of the adapter structure 22 has a flange portion 22a surrounding the adapter structure 22, and the flange portion 22a is embedded in the first recessed groove 1111. Thus, it is convenient to support and position the connection between the adapter structure 22 and the first shell wall 111, and it is beneficial for the two to be welded and connected from the outside of the first shell wall 111 (that is, the side away from the active material coating portion 32).

[0399] Exemplarily, the thickness of the flange portion 22a matches the groove depth T1 of the first groove 1111, where "matching" means that the thickness of the flange portion 22a is substantially consistent with the groove depth of the first groove 1111. Thus, it is convenient to weld the flange portion 22a to the first shell wall 111, the thickness of the flange portion 22a is not too large relative to the groove depth of the first groove 1111, and unnecessary space occupation can be reduced, and the thickness of the flange portion 22a is not too small relative to the groove depth of the first groove 1111, and the welding strength requirement can be met.

[0400] For example, in “step S331, placing the pole component 2 and the electrode component 3 connected to the electrode component 3 on the inner side of the first shell wall 111”; “step S332, covering the pole component 2 connected to the electrode component 3 on the mounting hole 112 from the inner side of the first shell wall 111, so that the adapter structure 22 stops at the inner side of the first shell wall 111”; and “step S333, connecting the adapter structure 22 to the first shell wall 111 from the outer side of the first shell wall 111”, the edge of the adapter structure 22 overlaps the side of the first shell wall 111 facing the electrode component 3. At this time, please refer to Figure 34A-32 D, the edge of the transfer structure 22 has a second recessed groove 22b that is open in the direction away from the electrode component 3 (that is, the second recessed groove 22b is open in the direction away from the active material coating portion 32), and the first shell wall 111 includes a lap portion 1112 protruding from the mounting hole 112, and the lap portion 1112 is embedded in the second recessed groove 22b. Therefore, it is convenient to support and position the connection between the pole component 2 and the first shell wall 111, which is conducive to the welding connection between the two from the outside of the first shell wall 111 (that is, the side away from the active material coating portion 32).

[0401] Exemplarily, the thickness of the overlap portion 1112 matches the groove depth T2 of the second groove 22b, where "matching" means that the thickness of the overlap portion 1112 is substantially consistent with the groove depth of the second groove 22b. Thus, it is convenient to weld the overlap portion 1112 to the first shell wall 111, the thickness of the overlap portion 1112 is not too large relative to the groove depth of the second groove 22b, which can reduce unnecessary space occupation, and the thickness of the overlap portion 1112 is not too small relative to the groove depth of the second groove 22b, which can meet the welding strength requirements.

[0402] In some other embodiments of this application, please refer to Fig.59 , Figure 60A-60D , Fig.59 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application; Figure 60A-60DAn exploded view of the assembly process of a battery cell provided for one embodiment of the present application; the pole body 21 includes a first pole piece 21a and a second pole piece 21b, the second pole piece 21b is installed on the first shell wall 111, the first pole piece 21a is installed on the second pole piece 21b, and the electrode component 3 is connected to the first pole piece 21a. "Step S20, connecting the electrode component 3 to the pole component 2" specifically includes: "Step S20b, connecting the electrode component 3 to the first pole piece 21a"; "Step S30, installing the pole component 2 connected to the electrode component 3 to the first shell wall 111" specifically includes: "Step S30b, assembling and connecting the first pole piece 21a connected to the electrode component 3 to the second pole piece 21b installed on the first shell wall 111".

[0403] In the above technical solution, by dividing the pole body 21 into two parts for assembly connection, when assembling the battery cell, the first pole member 21a can be connected to the electrode component 3, and the second pole member 21b can be connected to the first shell wall 111, and then the first pole member 21a and the second pole member 21b can be connected, which is beneficial to shorten the conductive part 4 and reduce the redundancy of the conductive part 4 and the material cost.

[0404] Please refer to Figure 60 again and combine Fig.61 , Fig.61 A flow chart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments of the present application, the second pole piece 21b defines a mating hole 21b1, and the first pole piece 21a is covered on the side of the second pole piece 21b away from the electrode component 3 and covers the mating hole 21b1; "Step S30b, assembling and connecting the first pole piece 21a connected to the electrode component 3 to the second pole piece 21b installed on the first shell wall 111" may specifically include: "Step S30b21, covering the first pole piece 21a connected to the electrode component 3 from the outer side of the second pole piece 21b in the mating hole 21b1", "Step S30b22, connecting the first pole piece 21a from the outer side of the first shell wall 111 to the second pole piece 21b".

[0405] In the above technical solution, by providing the matching hole 21b1, the first pole piece 21a and the second pole piece 21b can be connected from the outside of the pole component 2, which is beneficial to improve the connection convenience and connection reliability of the first pole piece 21a and the second pole piece 21b.

[0406] Please refer to Figure 60 again and combine Fig.62 , Fig.62A flow chart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments of the present application, "step S20b, connecting the electrode component 3 to the first pole piece 21a" may specifically include: "step S20b11, placing the electrode component 3 and the conductive part 4 on the inner side of the first shell wall 111, and passing the conductive part 4 through the matching hole 21b1 to the outside of the second pole piece 21b"; "step S20b12, connecting the conductive part 4 that passes through the outside of the first shell wall 111 to the first pole piece 21a placed on the outside of the first shell wall 111".

[0407] That is, when processing the above-mentioned battery cell 102, the following steps can be performed in sequence: step S20b11, placing the electrode component 3 and the conductive part 4 on the inner side of the first shell wall 111, and passing the conductive part 4 through the matching hole 21b1 to the outer side of the second pole piece 21b; step S20b12, connecting the conductive part 4 passing through the outer side of the first shell wall 111 to the first pole piece 21a placed on the outer side of the first shell wall 111; step S30b21, covering the first pole piece 21a connected to the electrode component 3 with the matching hole 21b1 from the outer side of the second pole piece 21b; step S30b22, connecting the first pole piece 21a from the outer side of the first shell wall 111 to the second pole piece 21b.

[0408] In the above technical solution, since the conductive part 4 is not connected to the first pole piece 21a when passing through the matching hole 21b1, it is convenient for the conductive part 4 to pass through the matching hole 21b1, thereby improving the convenience of operation. In addition, since the welding position between the first pole piece 21a and the conductive part 4 is located outside the first shell wall 111, the problem of conductive chips formed during welding entering the interior of the shell body 11 and causing damage to the electrode component 3 can be improved.

[0409] In the above embodiment, the first shell wall 111 can be the shell cover 12 or a part of the shell body 11. For the specific assembly sequence, please refer to the above description. Fig.17 The corresponding settings of step S2111 and step S2112, for example, when the shell cover 12 is the first shell wall 111, can refer to the above Figure 19-21 The corresponding settings of step S41, step S42, step S43 and step S44.

[0410] Please refer to Fig.63 , Figure 64A-Figure 64D , Fig.63 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application; Figure 64A-Figure 64DAn exploded diagram of the assembly process of a battery cell provided for an embodiment of the present application; in some embodiments of the present application, before "step S30b21, cover the first pole piece 21a connected to the electrode component 3 from the outer side of the second pole piece 21b to the matching hole 21b1", it also includes: "step S30b11, place the electrode component 3 and the first pole piece 21a connected to the electrode component 3 on the inner side of the first shell wall 111"; "step S30b12, pass the first pole piece 21a through the matching hole 21b1 to the outer side of the second pole piece 21b".

[0411] That is, when processing the above-mentioned battery cell 102, the following steps can be performed in sequence: step S20b, connecting the electrode component 3 with the first pole component 21a; step S30b11, placing the electrode component 3 and the first pole component 21a connected to the electrode component 3 on the inner side of the first shell wall 111; step S30b12, passing the first pole component 21a through the matching hole 21b1 to the outer side of the second pole component 21b; step S30b21, covering the first pole component 21a connected to the electrode component 3 with the matching hole 21b1 from the outer side of the second pole component 21b; step S30b22, connecting the first pole component 21a from the outer side of the first shell wall 111 to the second pole component 21b.

[0412] In the above technical solution, since the electrode component 3 and the first pole piece 21a are connected first and then the first pole piece 21a is passed through the matching hole 21b1, there is no need to consider avoiding the first shell wall 111 when connecting the electrode component 3 and the first pole piece 21a. In other words, when connecting the electrode component 3 and the first pole piece 21a, the second pole piece 21b and the electrode component 3 are not located on both sides of the first shell wall 111, which is conducive to further shortening the length of the conductive part 4, reducing the redundancy of the conductive part 4 after assembly, reducing the risk of reverse insertion, and improving the reliability of the battery cell 102. In addition, since the welding position of the electrode component 3 and the first pole piece 21a is located outside the shell body 11, the problem of conductive chips formed during welding entering the inside of the shell body 11 and causing damage to the electrode component 3 can be improved.

[0413] In the above embodiment, the first shell wall 111 can be the shell cover 12 or a part of the shell body 11. For the specific assembly sequence, please refer to the above description. Fig.29 The corresponding settings of step S3211 and step S3212, for example, when the shell cover 12 is the first shell wall 111, can refer to the above Fig.32 and Fig.33 The corresponding settings of step S43 and step S44.

[0414] The execution order of "installing the second pole piece 21b on the first shell wall 111" can be flexibly set, and can be set before the conductive part 4 or the first pole piece 21a passes through the matching hole 21b1, or can be set after the conductive part 4 or the first pole piece 21a passes through the matching hole 21b1. When the first pole piece 21a needs to pass through the matching hole 21b1 (for example, as shown in Figure 64), the execution order of "connecting the electrode component 3 with the first pole piece 21a" and "installing the second pole piece 21b on the first shell wall 111" is not limited, and can be performed one after the other or simultaneously.

[0415] Please refer to FIG. 60 again. The first shell wall 111 has a mounting hole 112. The second pole piece 21b is inserted through the mounting hole 112 and clamped on both the inner and outer sides of the first shell wall 111. An insulating sealing component 24 is provided between the second pole piece 21b and the first shell wall 111. Thus, the connection between the second pole piece 21b and the first shell wall 111 is more reliable, and by providing the insulating sealing component 24, the connection between the second pole piece 21b and the first shell wall 111 can be both insulated and sealed. The second pole piece 21b can be made of a metal material, which is beneficial to increase the conductive area of ​​the pole body 21. Exemplarily, the second pole piece 21b can be riveted to the first shell wall 111, thereby eliminating the welding process, improving the processing efficiency, and avoiding the influence of welding heat on the insulating sealing component 24. Among them, the composition of the insulating sealing component 24 is not limited, for example, it can be a single part, or it can be composed of multiple parts, for example, it can include elastic rubber parts, plastic parts, etc. In some other embodiments of the present application, the second pole piece 21b can also be configured to be composed of multiple welded parts, or the second pole piece 21b can also be configured to be made of non-metallic material and connected to the first shell wall 111 by bonding, injection molding, etc.

[0416] Please combine Fig.65 , Figure 66A-Figure 66C , Fig.65 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application; Figure 66A-Figure 66C An exploded view of the processing process of an electrode component provided for an embodiment of the present application; in some embodiments of the present application, the pole ear portion 33 of the electrode component 3 includes a gathered portion 313 formed by stacking and connecting multiple layers of pole ear sheets 311, and the pole ear portion 33 is connected to the pole column component 2 through the gathered portion 313, so that the conductive portion 4 only includes the pole ear portion 33, and the pole ear portion 33 is directly connected to the pole column component 2. At this time, before "step S20, connecting the electrode component 3 to the pole column component 2", it can also include: step S14 stacking and connecting the multiple layers of pole ear sheets 311 in the pole ear portion 33 of the electrode component 3 to form a gathered portion 313.

[0417] When the pole ear portion 33 is directly connected to the pole component 2 through the retracted portion 313, the assembly sequence of any of the above embodiments is suitable, for example Figures 10A-10D As shown (the conductive portion 4 of the electrode component 3 first passes through the mounting hole 112, the conductive portion 4 is welded to the pole component 2 outside the mounting hole 112, and the pole component 2 is then covered with the mounting hole 112 from the outer side of the first shell wall 111), or Figure 23A-23D As shown (the electrode component 3 and the pole component 2 are first welded, and after the pole component 2 passes through the mounting hole 112, the mounting hole 112 is covered from the outer side of the first shell wall 111), or Figure 34A-Figure 34D As shown, the electrode component 3 and the pole component 2 are welded first, the pole component 2 does not pass through the mounting hole 112 , and the mounting hole 112 is covered from the inner side of the first shell wall 111 .

[0418] Exemplarily, the electrode component 3 includes one or more electrode assemblies 31, and the electrode assembly 31 has a positive pole tab sheet 311 and a negative pole tab sheet 311. The multi-layer pole tab sheets 311 of the same polarity are stacked and gathered to form a stacking portion 312, and the multi-layer pole tab sheets 311 in the stacking portion 312 are connected to form a gathering portion 313. The multi-layer pole tab sheets 311 in the gathering portion 313 are electrically conductive, that is, the multi-layer pole tab sheets 311 in the gathering portion 313 not only present a stacking arrangement relationship, but also have a connection and conductive relationship. Among them, the connection method of the multi-layer pole tab sheets 311 in the gathering portion 313 is not limited, for example, it can be welding such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure melting welding, or brazing, or perforation connection, or bonding by conductive adhesive, etc. Exemplarily, the multi-layer pole tab sheets 311 of the same polarity can be ultrasonically welded, and the ultrasonic weld mark formed is the gathering portion 313.

[0419] The multiple layers of tab sheets 311 in the gathered portion 313 may belong to the same electrode assembly 31, or may respectively belong to different electrode assemblies 31, that is, several layers of tab sheets 311 of the same polarity in the same electrode assembly 31 may be connected to form the gathered portion 313, or several layers of tab sheets 311 of the same polarity in different electrode assemblies 31 may be connected to form the gathered portion 313. Exemplarily, all tab sheets 311 of the same polarity in the electrode component 3 may be connected to form the gathered portion 313, so that the number of the gathered portions 313 may be reduced.

[0420] Therefore, by connecting the multiple layers of pole ear sheets 311 in the pole ear portion 33 to form a gathered portion 313, the gathered portion 313 can present the form of a plate in which the multiple layers of pole ear sheets 311 are connected together and have a certain rigidity, rather than a fluffy and scattered multiple layers of foil. This facilitates the punching operation of the pole ear portion 33 on the one hand, such as facilitating the operation of punching the mounting hole 112 or the matching hole 21b1 of the pole ear portion 33, thereby improving the processing efficiency. On the other hand, it makes the welding of the gathered portion 313 and the pole component 2 (such as the pole body 21 or the first pole component 21a) more reliable, and it is not easy to form pores in the weld, which can improve the connection reliability and conductivity of the weld, and make the conductivity of the electrode component 3 and the pole component 2 more stable and reliable.

[0421] Please refer again Figure 66A-Figure 66C , and combined with Fig.67 , Fig.67 A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments, when the electrode component 3 includes a plurality of electrode assemblies 31, "step S14 connects the multi-layered pole tabs 311 in the pole tab portion 33 of the electrode component 3 to form a gathered portion 313" may specifically include: step S141 stacking the plurality of electrode assemblies 31 along the thickness direction of the electrode assembly 31; step S142 connects the multi-layered pole tabs 311 of at least two electrode assemblies 31 to form a gathered portion 313. Among them, since the plurality of electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31, the stacking direction of the electrode assembly 31 (for example Fig.66A The fourth direction (F4) shown in FIG. 1 is consistent with the thickness direction of the electrode assembly 31.

[0422] In the above technical scheme, before connecting the electrode component 3 and the pole component 2, multiple electrode assemblies 31 are stacked first, and several pole ear sheets 311 of the same polarity of the multiple electrode assemblies 31 are connected together to form a gathering portion 313. Compared with the technical scheme of connecting the pole ear sheets 311 of each electrode assembly 31 separately to form a gathering portion 313, the gathering portion 313 of each electrode assembly 31 is separately connected to the pole component 2, and then multiple electrode assemblies 31 are stacked. On the one hand, the total number of gathering portions 313 can be reduced, the connection steps of the gathering portion 313 and the pole body 21 can be reduced, and the processing efficiency can be improved. On the other hand, it can avoid the formation of tensile stress between the pole ear sheets 311 of different electrode assemblies 31 when the gathering portion 313 is manufactured first and the electrode assemblies 31 are stacked later, which causes the formation of cracks at the connection position between the pole ear portion 33 and the active material coating portion 32 due to the asynchronous movement of the pole ear sheets 311.

[0423] When the electrode component 3 includes a gathered portion 313 formed by connecting multiple layers of tab sheets 311 (regardless of whether step S141 and step S142 are performed in advance, i.e., the multiple layers of tab sheets 311 in the gathered portion 313 may belong to one electrode assembly 31 or may belong to multiple electrode assemblies 31 at the same time), please refer to Fig.68 , Fig.68 A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments of the present application, "step S20, connecting the electrode component 3 to the pole component 2" may specifically include: step S243, laying the retracted portion 313 on the inner end surface 211 of the pole body 21; step S244, connecting the retracted portion 313 to the inner end surface 211 of the pole body 21. Among them, the surface of the pole body 21 facing the electrode component 3 (i.e., facing the active material coating portion 32) is the inner end surface 211 of the pole body 21.

[0424] In the above technical solution, the gathering portion 313 is laid on the inner end surface 211 of the pole body 21 so that the gathering portion 313 is in a flat and stretched state, and at least part of the gathering portion 313 falls on the inner end surface 211 of the pole body 21, so that the pole ear portion 33 will not be damaged due to the bending of the gathering portion 313, thereby improving the charging performance, facilitating the setting of the welding nozzle, and improving the connection reliability between the gathering portion 313 and the pole body 21.

[0425] For example, please combine again Fig.39 and Fig.40 When the inner end surface 211 of the pole body 21 is relatively large, for example, the inner end surface 211 of the pole body 21 is in the shape of a long strip, such as a rectangle, an ellipse, a racetrack, etc., the gathered portion 313 can be completely laid flat on the inner end surface 211 of the pole body 21. Or, for example, please refer to Fig.47 When the inner end surface 211 of the pole body 21 is small, the position of the inner end surface 220 of the transition structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21. The surrounding area 2201 can be set to be flush with the inner end surface 211 of the pole body 21. At this time, a part of the gathered portion 313 can be laid flat on the inner end surface 211 of the pole body 21, and the rest can be laid flat on the surrounding area 2201, so that the gathered portion 313 (for example, the gathered portion 313 is also in the shape of a long strip) can be supported as a whole, which is convenient for the pressing of the welding nozzle, so that the gathered portion 313 can be reliably connected to the pole body 21.

[0426] In some embodiments of this application, please refer to Figure 6, the pole component 2 forms a receiving groove 5 which is recessed in the direction away from the electrode component 3 relative to the first shell wall 111 and is open in the direction of the electrode component 3, the electrode component 3 is connected to the pole component 2 through the conductive portion 4, and at least part of the conductive portion 4 is accommodated in the receiving groove 5 and is connected to the pole body 21. That is, the pole component 2 forms a receiving groove 5, the groove wall of the receiving groove 5 is formed by the pole component 2, the receiving groove 5 is recessed in the direction away from the active material coating portion 32, and the receiving groove 5 is open in the direction of the active material coating portion 32, so that the receiving groove 5 is connected to the receiving cavity 13.

[0427] Thus, by providing the receiving groove 5 to receive the conductive part 4, the space occupied by the conductive part 4 in the receiving chamber 13 can be reduced, so that the receiving chamber 13 has a larger space to receive the active material coating part 32, which is beneficial to increase the volume of the active material coating part 32, thereby increasing the energy density of the battery cell 102. Moreover, since the receiving groove 5 is open toward the electrode component 13, the conductive part 4 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0428] For example, please refer again to Figure 6 When the pole component 2 is constructed as any of the above-mentioned embodiments including the pole body 21 and the transition structure 22, the accommodating groove 5 is formed on the side of the pole body 21 and the transition structure 22 facing the electrode component 3 (i.e., the side facing the active material coating portion 32), and the transition structure 22 can be raised relative to the first shell wall 111 in the direction away from the electrode component 3 (i.e., the direction away from the active material coating portion 32), so that the accommodating groove 5 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3.

[0429] Therefore, by processing the adapter structure 22 into a protruding bulge, a part of the accommodating groove 5 is formed on the side of the pole body 21 facing the electrode component 3, and another part of the accommodating groove 5 is formed on the side of the adapter structure 22 facing the electrode component 3, and the accommodating groove 5 is in a shape that is recessed relative to the first shell wall 111 in the direction away from the electrode component 3, so that the side of the pole body 21 facing the electrode component 3 and the side of the adapter structure 22 facing the electrode component 3 both have space to accommodate the conductive part 4, which not only facilitates the storage of the conductive part 4 to a greater extent, but also facilitates the design of a variety of forms of the conductive part 4.

[0430] In other embodiments of the present application, in conjunction with FIG. 10 , when the adapter structure 22 does not bulge in the direction away from the electrode component 3 (i.e., away from the active material coating portion 32) relative to the first shell wall 111, the height difference between the adapter structure 22 and the pole body 21 can also define a receiving groove 5 that is recessed in the direction away from the electrode component 3 relative to the first shell wall 111. Alternatively, in conjunction with Fig.54The receiving groove 5 may also be defined by the first pole piece 21a and the second pole piece 21b.

[0431] In some embodiments of this application, please refer to Figure 6 , the surface of one end of the pole body 21 facing the electrode component 3 is the inner end face 211 of the pole body 21, the inner end face 211 of the pole body 21 participates in forming the receiving groove 5, and the conductive portion 4 is connected to the inner end face 211 of the pole body 21. That is, at least a portion of the inner end face 211 of the pole body 21 participates in defining the groove wall of the receiving groove 5, and the conductive portion 4 is connected to a portion of the inner end face 211 of the pole body 21 that serves as the groove wall of the receiving groove 5. In the above technical solution, at least a portion of the receiving groove 5 is surrounded by a surface of one side of the pole body 21 facing the electrode component 3, and the conductive portion 4 received in the receiving groove 5 can be easily contacted and connected to the pole body 21, thereby improving the convenience of connection and simplifying the structure. For example, combined with Fig.54 When the pole body 21 includes the first pole piece 21 a and the second pole piece 21 b , the surface of one end of the first pole piece 21 a facing the electrode component 3 is the inner end surface 211 of the pole body 21 .

[0432] Please refer again Figure 39-40 , and combined with Fig.69 , Fig.69 A flow chart of the steps of the battery cell assembly method provided for some embodiments of the present application; when the pole component 2 forms a receiving groove 5 that is recessed relative to the first shell wall 111 in a direction away from the electrode component 3 and open in the direction of the electrode component 3, in some embodiments of the present application, before "step S243, laying the retracted portion 313 on the inner end surface 211 of the pole body 21", it can also include: step S242, installing the retracted portion 313 into the receiving groove 5.

[0433] Therefore, by providing the receiving groove 5 to accommodate the retracted portion 313 , the space occupied by the pole ear portion 33 in the receiving cavity 13 can be reduced, so that the receiving cavity 13 has a larger space to accommodate the active material coating portion 32 , which is beneficial to increase the volume of the active material coating portion 32 , thereby increasing the energy density of the battery cell 102 .

[0434] Please refer again Figure 23A-23D , and combined with Fig.70 , Fig.70A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application; when the electrode component 3 includes a plurality of electrode assemblies 31 stacked, in some embodiments of the present application, before "step S243 laying the retracted portion 313 on the inner end surface 211 of the pole body 21", it may also include: step S2411, arranging the pole component 2 on one side of the extended pole ear portion 33 of the electrode component 3; step S2412, adjusting the angle of the pole component 2 so that the normal direction of the inner end surface 211 of the pole body 21 is close to the stacking direction of the plurality of electrode assemblies 31 (for example, Fig. 23B In the fourth direction F4 shown in FIG. 1 , the electrode assembly 31 may be stacked in a direction of 0.1° to 0.2°. In the present embodiment, the step of stacking the electrode assembly 31 may be performed before the retracted portion 313 is connected to the pole component 2, or may be performed after the retracted portion 313 is connected to the pole component 2, that is, the retracted portion 313 may be formed by stacking and connecting the multi-layered pole tab sheets 311 of at least two electrode assemblies 31, or may be formed by stacking and connecting the multi-layered pole tab sheets 311 of only one electrode assembly 31.

[0435] The “normal direction of the inner end face 211 of the pole body 21 is close to the stacking direction of the plurality of electrode assemblies 31” means that the normal direction of the inner end face 211 of the pole body 21 is consistent or substantially consistent with the stacking direction of the plurality of electrode assemblies 31. Substantially consistent can be understood as a small angle between the two, for example, less than 10°. The “arrangement of the pole component 2 on the side of the extended pole ear portion 33 of the electrode component 3” can be understood as: the pole ear portion 33 is located on one side of the active material coating portion 32, and the pole component 2 and the pole ear portion 33 are arranged on the same side of the active material coating portion 32, so as to facilitate shortening the length of the pole ear portion 33. In the above technical solution, the “length of the pole ear portion 33” is such that: when the normal direction of the inner end face 211 of the pole body 21 of the pole component 2 is close to the stacking direction of the plurality of electrode assemblies 31, the pole component 2 can be located on the side of the extended pole ear portion 33 of the electrode component 3, and the retracted portion 313 can be laid on the inner end face 211 of the pole body 21.

[0436] In the above technical solution, the position and angle of the pole component 2 are first adjusted so that the normal direction of the inner end surface 211 of the pole body 21 is close to the stacking direction of the multiple electrode assemblies 31, and then the gathering portion 313 is laid on the inner end surface 211 of the pole body 21. After that, there is no need to adjust the angle of the pole body 21, so that there is enough space near the matching position of the gathering portion 313 and the inner end surface 211 of the pole body 21 to perform the welding operation of the gathering portion 313 and the pole body 21, thereby simplifying the operation and making the length of the pole ear portion 33 shorter.

[0437] Please refer again Figure 23A-23D , and combined with Fig.70For example, when there is a receiving groove 5 at the pole component 2, the "step S2411 of setting the pole component 2 on one side of the protruding pole ear portion 33 of the electrode component 3; step S2412 of adjusting the angle of the pole component 2 so that the normal of the inner end surface is close to the stacking direction of the multiple electrode assemblies 31" can be executed first, and then the "step S242 of loading the retracted portion 313 into the receiving groove 5" can be executed. After the retracted portion 313 is loaded into the receiving groove 5 and laid on the inner end surface 211 of the pole body 21, there is no need to adjust the angle of the pole body 21, so that there is enough space near the matching position between the retracted portion 313 and the inner end surface 211 of the pole body 21 for welding operation, thereby simplifying the operation.

[0438] Please refer again Figure 6 , and combined with Fig.71 , Fig.71 The flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application, in some embodiments of the present application, the pole part 2 includes a pole body 21, the electrode part 3 is connected to the pole body 21 through the conductive part 4, the conductive part 4 includes a pole ear part 33 composed of a pole ear sheet 311 of the electrode part 3, and a conductive member 41 connected to the pole ear part 33, and the pole ear part 33 is connected to the pole body 21 through the conductive member 41; "Step S20 connects the electrode part 3 to the pole part 2" specifically includes: step S251, connect the pole ear part 33 to the conductive member 41. Among them, the connection method of the pole ear part 33 and the conductive member 41 is not limited, for example, it can be welding such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure melting welding, or brazing, or perforation connection, or bonding by conductive adhesive, etc.

[0439] Therefore, by connecting the pole ear portion 33 and the pole body 21 through the conductive member 41, the length of the pole ear portion 33 can be shortened, and the problems of wrinkling, bending and breaking of the pole ear piece 311 can be improved. Moreover, by flexibly designing the shape and material of the conductive member 41, the difficulty of connection with the pole body 21 can be reduced, and the convenience of connection between the conductive member 41 and the pole body 21 can be improved.

[0440] When the pole ear portion 33 is indirectly connected to the pole body 21 through the conductive member 41, the assembly sequence of any of the above embodiments is suitable, for example Figure 12A-12E As shown (the conductive portion 4 of the electrode component 3 first passes through the mounting hole 112, the conductive portion 4 is welded to the pole component 2 outside the mounting hole 112, and the pole component 2 is then covered with the mounting hole 112 from the outer side of the first shell wall 111), or Figure 24A-Figure 24DAs shown (the electrode component 3 and the pole component 2 are welded first, and after the pole component 2 passes through the mounting hole 112, the mounting hole 112 is covered from the outer side of the first shell wall 111), or the electrode component 3 and the pole component 2 are welded first, the pole component 2 does not pass through the mounting hole 112, and the mounting hole 112 is covered from the inner side of the first shell wall 111.

[0441] Please refer again Figure 66A-Figure 66C , and combined with Fig.72 , Fig.72 A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments, when the electrode component 3 includes multiple electrode assemblies 31, before "step S251 connecting the pole ear portion 33 to the conductive member 41", it also includes: step S151 stacking multiple electrode assemblies 31 along the thickness direction of the electrode assembly 31; step S152 stacking and gathering the multi-layer pole ear sheets 311 of at least two electrode assemblies 31 to form a stacked sheet portion 312. Among them, since multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31, the stacking direction of the electrode assembly 31 (for example Fig.66A The fourth direction (F4) shown in FIG. 1 is consistent with the thickness direction of the electrode assembly 31.

[0442] In the above technical scheme, before connecting the pole ear portion 33 and the conductive member 41, multiple electrode assemblies 31 are stacked first, and several pole ear sheets 311 of the same polarity of the multiple electrode assemblies 31 are gathered together to form a stacking portion 312. Compared with the technical scheme of individually gathering the pole ear sheets 311 of each electrode assembly 31 to form a stacking portion 312, the stacking portion 312 of each electrode assembly 31 is individually connected to the conductive member 41, and then multiple electrode assemblies 31 are stacked, on the one hand, the total number of stacking portions 312 and conductive members 41 can be reduced, the connection steps of the stacking portion 312 and the conductive member 41 can be reduced, and the processing efficiency can be improved. On the other hand, it can avoid the problem of tensile stress formed between the pole ear sheets 311 of different electrode assemblies 31 due to the asynchronous movement when the stacking portion 312 and the conductive member 41 are connected first and then the electrode assemblies 31 are stacked, causing cracks at the connection position between the pole ear portion 33 and the active material coating portion 32.

[0443] When the electrode ear portion 33 of the electrode component 3 includes a stacked portion 312 formed by stacking and gathering multiple electrode ear sheets 311 (regardless of whether steps S151 and S152 are performed in advance, that is, the multiple electrode ear sheets 311 in the gathered portion 313 may belong to one electrode assembly 31 or may belong to multiple electrode assemblies 31 at the same time), please refer to Fig.73 , Fig.73A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application; in some embodiments of the present application, before "step S251 connecting the pole ear portion 33 with the conductive member 41", it also includes: step S153 connecting the multiple pole ear sheets 311 in the stacked sheet portion 312 to form a gathered portion 313. Thus, the pole ear portion 33 can be connected to the conductive member 41 through the gathered portion 313.

[0444] The multi-layered pole tabs 311 in the gathered portion 313 are electrically conductive, that is, the multi-layered pole tabs 311 in the gathered portion 313 are not only stacked, but also connected and conductive. The connection method of the multi-layered pole tabs 311 in the gathered portion 313 is not limited, for example, it can be welding such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure melting welding, or brazing, or perforation connection, or bonding through conductive adhesive, etc. Exemplarily, the multi-layered pole tabs 311 of the same polarity can be ultrasonically welded, and the ultrasonic weld mark formed is the gathered portion 313.

[0445] Therefore, by pre-connecting the multiple layers of pole ear sheets 311 in the stacked portion 312 to form a gathered portion 313, the gathered portion 313 can present the form of a plate with multiple layers of pole ear sheets 311 connected together and having a certain rigidity, rather than a fluffy and scattered multiple layers of foil, thereby facilitating the coordinated connection between the pole ear portion 33 and the conductive component 41, and making the welding between the pole ear portion 33 and the conductive component 41 more reliable, and making it less likely to form pores in the weld, which can improve the connection reliability and conductivity of the weld, and make the conduction between the electrode component 3 and the pole column component 2 more stable and reliable.

[0446] Please refer again Figure 13A-13E , and combined with Fig.74 , Fig.74 A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments of the present application, the conductive member 41 includes a first connecting segment 411, and "step S251 connects the pole ear portion 33 to the conductive member 41" may specifically include: step S251011 overlaps the folded portion 313 on one side in the thickness rear direction of the first connecting segment 411; step S251012 connects the folded portion 313 to the first connecting segment 411. The conductive member 41 has a first connecting segment 411, and the first connecting segment 411 is consistent with the folded portion 313 in the thickness direction. The two are overlapped and connected (for example, welded) along the thickness direction of the first connecting segment 411, so that the matching mode of the folded portion 313 and the conductive member 41 is simple, which is conducive to improving production efficiency.

[0447] Please refer again Figure 12A-12E , and combined with Fig.75 , Fig.75A flow chart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments of the present application, the conductive member 41 has a first connecting section 411, the first connecting section 411 includes two clamping portions 4110, and the pole ear end 331 of the pole ear portion 33 (such as the gathering portion 313 or the lamination portion 312) is clamped between the two clamping portions 4110; "Step S251 connects the pole ear portion 33 with the conductive member 41" specifically includes: Step S251021 clamps the pole ear end 331 of the pole ear portion 33 (such as the gathering portion 313 or the lamination portion 312) between the two clamping portions 4110; Step S251022 connects the pole ear end 331 of the pole ear portion 33 (such as the gathering portion 313 or the lamination portion 312) and the two clamping portions 4110 into one.

[0448] Thus, the two clamping parts 4110 can be used to limit the pole ear part 33, thereby improving the connection reliability of the multi-layer pole ear sheet 311 in the pole ear part 33. In addition, in some examples, by providing two clamping parts 4110, the pole ear part 33 clamped between the two clamping parts 4110 can be in the state of the laminated part 312, that is, the step of connecting the multi-layer pole ear sheet 311 in the laminated part 312 to form the gathered part 313 can be omitted, thereby simplifying the processing procedure and improving the processing efficiency. Of course, the multi-layer pole ear sheet 311 in the laminated part 312 can also be connected to form the gathered part 313 first, and then the gathered part 313 can be clamped between the two clamping parts 4110 and connected to the clamping parts 4110, so that the porosity at the connection between the conductive member 41 and the pole ear part 33 can be reduced, and the current capacity and connection reliability can be improved.

[0449] Please refer again Fig.76 and Fig.77 , Fig.76 A flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application, Fig.77 A flow chart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments of the present application, after "step S251 connecting the pole ear portion 33 with the conductive member 41", it may also include: step S252, adjusting the angle of the pole component 2 so that the inner end surface 211 of the pole body 21 faces the electrode component 3 (that is, toward the active material coating portion 32), and the first connecting section 411 of the conductive member 41 is supported on the side of the pole ear portion 33 away from the pole body 211.

[0450] Among them, “the first connecting section 411 of the conductive member 41 is supported on the side of the pole ear portion 33 away from the pole body 211” means: at least part of the first connecting section 411 is supported on the side of the portion of the pole ear portion 33 connected to the first connecting section 411 away from the inner end surface 211 of the pole body 21.

[0451] For example, refer again to Figure 13A-13E, and combined with Fig.76 , after "step S251011 overlaps the gathering portion 313 on one side in the rear direction of the thickness of the first connecting segment 411; step S251012 connects the gathering portion 313 to the first connecting segment 411", step S252 can be specifically: the angle of the pole component 2 can be adjusted so that the inner end surface 211 of the pole body 21 faces the electrode component 3, and the first connecting segment 411 of the conductive member 41 is supported on the side of the gathering portion 313 away from the inner end surface 211 of the pole body 21.

[0452] For another example, please refer to Figure 12A-12E , and combined with Fig.77 , after "step S251021 clamps the pole ear end 331 (such as the gathering portion 313 or the lamination portion 312) of the pole ear portion 33 between the two clamping portions 4110; step S251022 connects the pole ear end 331 (such as the gathering portion 313 or the lamination portion 312) of the pole ear portion 33 with the two clamping portions 4110 into one", step S252 can be specifically: the angle of the pole column component 2 can be adjusted so that the inner end surface 211 of the pole column body 21 faces the electrode component 3, and a clamping portion 4110 of the first connecting section 411 of the conductive member 41 is supported on the side of the pole ear end 331 (such as the gathering portion 313 or the lamination portion 312) of the pole ear portion 33 away from the inner end surface 211 of the pole column body 21.

[0453] In the above technical solution, the first connecting section 411 of the conductive member 41 supports the pole ear portion 33, thereby improving the redundancy of the pole ear portion 33 and reducing the risk of short circuit caused by the pole ear portion 33 being inserted into the active material coating portion 32. In addition, the bent conductive member 41 can play a role of buffer support, reducing the risk of the electrode component 3 hitting the first shell wall 111, and improving the reliability of the battery cell 102.

[0454] Please refer again Figure 12A-12E , and combined with Fig.78 , Fig.78 A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments of the present application, "step S20, connecting the electrode component 3 with the pole component 2" may also include: step S253, connecting the conductive member 41 with the pole body 21. In other words, the conductive member 41 and the pole body 21 are separate parts and are assembled and connected, so that the conductive member 41 and the pole body 21 can be flexibly designed and processed, thereby improving the diversity of the battery cell 102.

[0455] The connection method between the conductive member 41 and the pole body 21 is not limited, for example, it can be welding such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure melting welding, or brazing, or perforation connection, or bonding through conductive adhesive, etc. Of course, the present application is not limited to this. For example, in some other embodiments of the present application, such as combining Figure 13A-13E , the conductive member 41 and the pole body 21 can also be integrated into one body without the need for an assembly and connection process of the two.

[0456] Please refer again Figure 12A-12E , and combined with Fig.79 , Fig.79 A flow chart of the steps of an assembly method of a battery cell 102 provided for some embodiments of the present application; in some embodiments of the present application, the conductive member 41 includes a second connecting segment 412, and "step S253 connecting the conductive member 41 to the pole body 21" specifically includes: step S2534 laying the second connecting segment 412 on the inner end surface 211 of the pole body 21; step S2535 connecting the second connecting segment 412 to the inner end surface 211 of the pole body 21.

[0457] In the above technical solution, by laying the second connection section 412 of the conductive member 41 on the inner end surface 211 of the pole body 21, at least part of the second connection section 412 falls on the inner end surface 211 of the pole body 21 and is connected to the inner end surface 211 of the pole body 21, which is conducive to increasing the connection area between the second connection section 412 of the conductive member 41 and the pole body 21 and improving the charging performance. It is also convenient to set the welding nozzle, and improve the connection reliability between the second connection section 412 of the conductive member 41 and the pole body 21.

[0458] Exemplarily, when the inner end surface 211 of the pole body 21 is larger, for example, the inner end surface 211 of the pole body 21 is in an elongated shape, such as a rectangle, an ellipse, a racetrack, etc., the second connecting section 412 can be completely laid flat on the inner end surface 211 of the pole body 21. Or illustratively, when the inner end surface 211 of the pole body 21 is small, the position of the inner end surface 220 of the transition structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, and the surrounding area 2201 can be set to be flush with the inner end surface 211 of the pole body 21. At this time, a part of the second connecting segment 412 can be laid flat on the inner end surface 211 of the pole body 21, and the remaining part can be laid flat on the surrounding area 2201, so that the second connecting segment 412 (for example, the second connecting segment 412 is also a long strip) can be supported as a whole, which is convenient for the pressing of the welding nozzle, so that the second connecting segment 412 can be reliably connected to the pole body 21.

[0459] Please refer again Figure 12A-12E , and combined with Fig.80 , Fig.80 A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments of the present application, the pole component 2 is surrounded by a receiving groove 5 that is recessed in the direction away from the electrode component 3 relative to the first shell wall 111 and is open in the direction of the electrode component 3, and the electrode component 3 is connected to the pole component 2 through the conductive part 4, and at least part of the conductive part 4 is accommodated in the receiving groove 5 and connected to the pole body 21. That is, the pole component 2 is surrounded by the receiving groove 5, the groove wall of the receiving groove 5 is formed by the pole component 2, the receiving groove 5 is recessed in the direction away from the active material coating part 32, and the receiving groove 5 is open in the direction of the active material coating part 32, so that the receiving groove 5 is connected with the receiving cavity 13. At this time, before "step S2534 laying the second connecting section 412 on the inner end surface 211 of the pole body 21", it also includes: step S2533, installing the second connecting section 412 into the receiving groove 5.

[0460] Thus, by providing the receiving groove 5 to receive the second connecting segment 412 of the conductive member 41, the space occupied by the conductive member 41 in the receiving chamber 13 can be reduced, so that the receiving chamber 13 has a larger space to receive the active material coating portion 32, which is beneficial to increase the volume of the active material coating portion 32, thereby increasing the energy density of the battery cell 102. Moreover, since the receiving groove 5 is open toward the electrode component 13, the second connecting segment 412 can be easily extended into the receiving groove 5, reducing the difficulty of operation.

[0461] Exemplarily, when the second connecting section 412 is received in the receiving groove 5 , the structure of the receiving groove 5 is not limited.

[0462] Exemplarily, the receiving groove 5 is formed on the side of the pole body 21 and the transition structure 22 facing the electrode component 3 (i.e., the side facing the active material coating portion 32), and the transition structure 22 can be raised relative to the first shell wall 111 in the direction away from the electrode component 3 (i.e., the direction away from the active material coating portion 32), so that the receiving groove 5 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3. Thus, by processing the transition structure 22 into an outwardly protruding form, a part of the receiving groove 5 is formed on the side of the pole body 21 facing the electrode component 3, and another part of the receiving groove 5 is formed on the side of the transition structure 22 facing the electrode component 3, and the receiving groove 5 presents a shape that is recessed relative to the first shell wall 111 in the direction away from the electrode component 3, so that the side of the pole body 21 facing the electrode component 3 and the side of the transition structure 22 facing the electrode component 3 both have a spatial second connecting segment 412, so that it is not only convenient to accommodate the second connecting segment 412 to a greater extent, but also conducive to the design of the form diversity of the second connecting segment 412.

[0463] Alternatively, illustratively, when the transition structure 22 does not bulge in the direction away from the electrode component 3 (i.e., away from the active material coating portion 32) relative to the first shell wall 111, the height difference between the transition structure 22 and the pole body 21 can also define a receiving groove 5 that is recessed in the direction away from the electrode component 3 relative to the first shell wall 111. Alternatively, the receiving groove 5 can also be defined by the first pole piece 21a and the second pole piece 21b.

[0464] Exemplarily, the surface of one end of the pole body 21 facing the electrode component 3 is the inner end face 211 of the pole body 21, the inner end face 211 of the pole body 21 participates in forming the receiving groove 5, and the second connecting section 412 is connected to the inner end face 211 of the pole body 21. That is, at least part of the inner end face 211 of the pole body 21 participates in defining the groove wall of the receiving groove 5, and the second connecting section 412 is connected to the part of the inner end face 211 of the pole body 21 that serves as the groove wall of the receiving groove 5. In the above technical solution, at least part of the receiving groove 5 is surrounded by the surface of one side of the pole body 21 facing the electrode component 3, and the second connecting section 412 received in the receiving groove 5 can be easily contacted and connected to the pole body 21, thereby improving the convenience of connection and simplifying the structure. For example, when the pole body 21 includes a first pole piece 21a and a second pole piece 21b, the surface of one end of the first pole piece 21a facing the electrode component 3 is the inner end face 211 of the pole body 21.

[0465] Please refer again Figure 12A-12E , and combined with Fig.81 , Fig.81 A flowchart of the steps of the battery cell assembly method provided for some embodiments of the present application; in some embodiments of the present application, when the electrode component 3 includes a plurality of electrode assemblies 31 stacked and arranged, before "step S2534, laying the second connecting section 412 on the inner end surface 211 of the pole body 21", it also includes: step S2531, arranging the pole component 2 on one side of the protruding pole ear portion 33 of the electrode component 3; step S2532, adjusting the angle of the pole component 2 so that the normal direction of the inner end surface 211 of the pole body 21 is close to the stacking direction of the plurality of electrode assemblies 31 (for example, Fig. 12C In the fourth direction F4 shown in FIG. 1 , the electrode assembly 31 may be stacked in a direction of 0.1° to 0.2°. In the present embodiment, the step of stacking the electrode assembly 31 may be performed before the retracted portion 313 is connected to the pole component 2, or may be performed after the retracted portion 313 is connected to the pole component 2, that is, the retracted portion 313 may be formed by stacking and connecting the multi-layered pole tab sheets 311 of at least two electrode assemblies 31, or may be formed by stacking and connecting the multi-layered pole tab sheets 311 of only one electrode assembly 31.

[0466] The “normal direction of the inner end face 211 of the pole body 21 is close to the stacking direction of the multiple electrode assemblies 31” means that the normal direction of the inner end face 211 of the pole body 21 is consistent or substantially consistent with the stacking direction of the multiple electrode assemblies 31. Substantially consistent can be understood as a small angle between the two, for example, less than 10°. The “arranging the pole component 2 on the side of the extended pole ear portion 33 of the electrode component 3” can be understood as: the pole ear portion 33 is located on one side of the active material coating portion 32, and the pole component 2 and the pole ear portion 33 are arranged on the same side of the active material coating portion 32, which is conducive to shortening the total length of the conductive portion 4, saving materials, and reducing costs. In the above technical solution, the “total length of the conductive part 4” is such that: when the normal of the inner end face 211 of the pole body 21 of the pole component 2 is close to the stacking direction of the multiple electrode assemblies 31, the pole component 2 can be located on the side of the protruding pole ear portion 33 of the electrode component 3, and the second connecting section 412 of the conductive member 41 can be laid on the inner end face 211 of the pole body 21.

[0467] In the above technical solution, by first adjusting the position and angle of the pole component 2 so that the normal of the inner end surface 211 of the pole body 21 is close to the stacking direction of the multiple electrode assemblies 31, and then laying the second connecting section 412 of the conductive member 41 on the inner end surface 211 of the pole body 21, there is no need to adjust the angle of the pole body 21. Thereby, there is enough space near the matching position of the second connecting section 412 and the inner end surface 211 of the pole body 21 to perform the welding operation of the second connecting section 412 and the pole body 21, thereby simplifying the operation.

[0468] For example, please refer again to Fig.81 , when the step S2533, when the second connecting section 412 is installed in the receiving groove 5, before the step S2534, the second connecting section 412 is installed in the receiving groove 5, the step S2531, the pole component 2 is arranged on one side of the protruding pole ear portion 33 of the electrode component 3; the step S2532, the angle of the pole component 2 is adjusted so that the normal direction of the inner end surface 211 of the pole body 21 is close to the stacking direction of the plurality of electrode assemblies 31 can be performed before the step S2533, the second connecting section 412 is installed in the receiving groove 5 and installed in the inner end surface 211 of the pole body 21. In this way, after the second connecting section 412 is installed in the receiving groove 5 and installed in the inner end surface 211 of the pole body 21, there is no need to adjust the angle of the pole body 21, so that there is enough space near the matching position between the second connecting section 412 and the inner end surface 211 of the pole body 21 for welding operation, thereby simplifying the operation.

[0469] The shape of the conductive member 41 is not limited to the above-mentioned embodiment. For example, the design of the conductive member 41 may also have at least the following two embodiments.

[0470] In some embodiments, reference Fig.48 , the position of the inner end surface 220 of the transition structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, and the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction toward the electrode component 3. Among them, the inner end surface 220 of the transition structure 22 can be a planar structure or a non-planar structure, such as a bulge, and the circle of the inner end surface 220 of the transition structure 22 that is most facing the pole body 21 is the surrounding area 2201.

[0471] Thus, by setting the inner end surface 211 of the pole body 21 to protrude from the surrounding area 2201 toward the direction of the electrode component 3, when the height of the pole body 21 is constant, the pole body 21 can be retracted in the direction of the accommodating cavity 13, so as to reduce the space occupied by the pole component 2 outside the shell component 1, and reduce the battery cell 102 in the direction of setting the pole component 2 (for example Figure 3 The dimension in the first direction F1) shown in FIG.

[0472] In some embodiments, reference Fig.48 , combined with Fig.82 , Fig.82 The flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application, the conductive member 41 includes a first conductive segment 415 laid on the inner end surface 211 of the pole body 21, and a second conductive segment 416 staggered from the inner end surface 211 of the pole body 21, the second conductive segment 416 protrudes in the direction away from the electrode component 3 (that is, toward the outside, or in the direction away from the active material coating portion 32) relative to the first conductive segment 415, and the pole ear portion 33 is connected to the second conductive segment 416. At this time, "step S20, connecting the electrode component to the pole component" also includes: step S261, shaping the conductive member 41 so that the conductive member 41 includes the first conductive segment 415 and the second conductive segment 416; step S262, connecting the pole ear portion 33 to the second conductive segment 416.

[0473] In this way, when the inner end surface 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is set to be a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is set in the center of the adapter structure 22 and has a circular outline), the height difference between the inner end surface 211 of the pole body 21 and the surrounding area 2201 can be used to accommodate the second conductive segment 416 and the pole ear portion 33 of the conductive member 41, so that the space can be fully utilized, the space occupied by the conductive part 4 in the accommodating cavity 13 can be reduced, and the energy density of the battery cell 102 can be improved. Exemplarily, if the portion where the pole ear portion 33 connects to the second conductive segment 416 (such as the retracted portion 313 in this article) is a long strip, the second conductive segment 416 can also be set to be a long strip, and the first conductive segment 415 can be set to be a circular shape that matches the pole body 21, which can meet the connection requirements.

[0474] In addition, when the conductive member 41 includes a first conductive segment 415 and a second conductive segment 416, in order to ensure that the second conductive segment 416 protrudes relative to the first conductive segment 415 in a direction away from the electrode component 3, the conductive member 41 can be processed with a material having a certain hardness and thickness, for example, the conductive member 41 can be a metal sheet.

[0475] In some embodiments, reference Fig.49 , the position of the inner end surface 220 of the transition structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, and the surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 toward the electrode component 3. Among them, the inner end surface 220 of the transition structure 22 can be a planar structure or a non-planar structure, such as a bulge, and the circle of the inner end surface 220 of the transition structure 22 that is most facing the pole body 21 is the surrounding area 2201.

[0476] Therefore, by setting the surrounding area 2201 to protrude from the inner end surface 211 of the pole body 21 toward the electrode component 3, a space can be formed between the surrounding area 2201 and the inner end surface 211 of the pole body 21 to accommodate the conductive part 4, thereby reducing the space occupied by the conductive part 4 in the accommodating cavity 13, which is beneficial to improving the energy density of the battery cell 102.

[0477] In some embodiments, reference Fig.49 , combined with Fig.83 , Fig.83 The flowchart of the steps of the battery cell assembly method provided in some embodiments of the present application, the inner end surface 211 of the pole body 21 includes a matching area 211a opposite to the annular hole of the surrounding area 2201, the conductive member 41 includes a first conductive segment 415 laid on the matching area 211a, the conductive member 41 includes a third conductive segment 417 staggered from the matching area 211a, the third conductive segment 417 protrudes relative to the first conductive segment 415 toward the direction of the electrode component 3 (that is, toward the inside, or toward the direction of the active material coating portion 32), and the pole ear portion 33 is connected to the third conductive segment 417. At this time, "step S20, connecting the electrode component to the pole component" also includes: step S271, shaping the conductive member 41 so that the conductive member 41 includes the first conductive segment 415 and the third conductive segment 417; step S272, connecting the pole ear portion 33 to the third conductive segment 417.

[0478] In this way, when the inner end face 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is configured to be a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is disposed at the center of the adapter structure 22 and has a circular outline), by configuring the first conductive segment 415 to be relatively small (for example, circular) so as to be able to extend into the annular hole of the surrounding area 2201 and be laid in the matching area 211a, the adapter 41 can not only meet the connection requirements with the inner end face 211 of the pole body 21, but also easily meet the connection requirements with the pole ear portion 33. Exemplarily, if the portion where the pole ear portion 33 is connected to the third conductive segment 417 (such as the gathered portion 313 described herein) is in the shape of a long strip, the third conductive segment 417 can also be configured to be in the shape of a long strip, thereby increasing the connection area between the two, and at the same time, the first conductive segment 415 is configured to be in a shape (for example, circular) that matches the matching area 211a, so as to meet the connection requirements.

[0479] In addition, when the conductive member 41 includes the first conductive segment 415 and the third conductive segment 417, in order to ensure that the third conductive segment 417 protrudes relative to the first conductive segment 415 toward the electrode component 3, the conductive member 41 can be processed with a material having a certain hardness and thickness, for example, the conductive member 41 can be a metal sheet.

[0480] In some embodiments of the present application, when the adapter structure 22 is formed into a long strip (for example, a rectangle, an ellipse, a racetrack, etc.) extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22 (for example, a rectangle, an ellipse, a racetrack, etc.), any of the above-mentioned connection schemes between the conductive part 4 and the pole body 21 can be selected. For example, regardless of whether the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21 (the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21), or concave (the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 toward the electrode component 3), or convex (the surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 toward the electrode component 3), the pole connecting portion (for example, the gathering portion 313 of the pole ear portion 33 in this article, or the second connecting segment 412 or the first conductive segment 415 of the conductive member 41) of the electrical portion 4 (for example, the pole ear portion 33 or the conductive member 41) can be set to a long strip shape matching the contour shape of the inner end surface 211 of the pole body 21, and laid on the inner end surface 211 of the pole body 21, thereby increasing the connection area between the conductive portion 4 and the pole body 21 and improving the charging performance.

[0481] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 of the pole ear portion 33 described herein (such as an ultrasonic weld), or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0482] In some embodiments of this application, please refer to Figure 6 The electrode component 3 includes an active material coating portion 32 accommodated in the accommodating cavity 13, the active material coating portion 32 is connected to the pole body 21 through the conductive portion 4, and the conductive portion 4 is bent to form at least two open grooves 42, wherein the openings of the two open grooves 42 are in different directions and are adjacent in the direction from the pole body 21 to the active material coating portion 32 (for example Figure 6 As shown, one of the two adjacent open slots 42 faces left, and the other faces right, so that the conductive portion 4 is roughly "S"-shaped). As a result, the conductive portion 4 can present a serpentine shape that bends back and forth, and the conductive portion 4 can play a buffering role. When the battery cell 102 is used in a vibration environment, the impact of the active material coating portion 32 toward the first shell wall 111 can be reduced, which plays a role in protecting the electrode component 3 and improving the reliability of the battery cell 102. Moreover, since the conductive portion 4 does not extend irregularly, the mutual interference and scratching between the pole tabs 311 and the pole tabs 311 in the conductive portion 4, as well as the risk of the pole tabs 311 being inserted upside down into the active material coating portion 32 can be improved, thereby further improving the reliability of the battery cell 102.

[0483] For example, please refer again to Figure 6 When the conductive part 4 includes the pole ear part 33 and the conductive member 41 connected to the pole ear part 33, and the pole ear part 33 is connected to the pole body 21 through the conductive member 41, the conductive member 41 and the pole ear part 33 are bent together to form two opening grooves 42 with opposite opening directions and adjacent to each other. For example, the first connecting section 411 and the pole ear part 33 define another opening groove 42 (for example, the first opening groove 421), and the first connecting section 411 and the second connecting section 412 define an opening groove 42 (for example, the second opening groove 422). As a result, the conductive part 4 can present a reciprocatingly bent S shape, thereby shortening the length of the conductive part 4, simplifying the structure of the conductive part 4, and facilitating the processing of the conductive part 4.

[0484] Or, for example, see Fig. 10DWhen the pole ear portion 33 constitutes the conductive portion 4 to extend to the pole body 21 and is connected to the pole body 21, the pole ear portion 33 is bent alone to form two opening slots 42 with openings facing opposite and adjacent to each other, the pole ear portion 33 is bent alone to form two opening slots 42 with openings facing opposite and adjacent to each other. Thus, the conductive portion 4 can present a reciprocatingly bent S-shape, thereby shortening the length of the conductive portion 4, simplifying the structure of the conductive portion 4, and facilitating the processing of the conductive portion 4.

[0485] Combination Figures 10A-10D , Figure 12A-1 0E, and refer to Fig.84 , Fig.84 A flow chart of the steps of the battery cell assembly method provided for some embodiments of the present application. In some embodiments of the present application, when the conductive portion 4 is bent to form at least two open grooves 42, the opening directions of the two adjacent open grooves 42 are different, and they are adjacent in the direction from the pole component 2 to the active material coating portion 32, "Step S30, installing the pole component 2 connected to the electrode component 3 to the first shell wall 111" may specifically include: "Step S30c, shaping the conductive portion 4 so that the conductive portion 4 is bent to form the above-mentioned at least two open grooves 42." Among them, the manner and time of shaping the conductive portion 4 are not limited, for example, it can be performed in conjunction with the covering action of the pole component 2 to the first shell wall 111, or it can be performed in conjunction with the covering action of the first pole component 21a to the second pole component 21b, thereby improving the processing efficiency.

[0486] For example, please refer to Fig.85 , Fig.85 In the flowchart of the assembly method of the battery cell provided in some embodiments of the present application, "step S30c, shaping the conductive part 4 so that the conductive part 4 is bent to form the above-mentioned at least two opening grooves 42" can be specifically as follows: step S30c1, bending and deforming the portion of the conductive part 4 located between the pole component 2 and the active material coating part 32 into two opening grooves 42 with openings facing opposite directions, such as the first opening groove 421 and the second opening groove 422. Thus, step S30c can be simplified, and the conductive part 4 can present a reciprocating bending S shape, thereby shortening the length of the conductive part 4, simplifying the structure of the conductive part 4, and facilitating the processing of the conductive part 4.

[0487] For example, please combine Figure 12A-1 0E, and refer to Fig.86 , Fig.86The present invention provides a flowchart of the steps of the battery cell assembly method provided in some embodiments of the present invention, wherein the battery cell 102 includes a shaping bracket 9 provided on a side of the electrode component 3 close to the pole component 2, and the shaping bracket 9 has a through hole 91, wherein the conductive portion 4 is provided through the through hole 91, the active material coating portion 32 connected to the conductive portion 4 is located on the inner side of the shaping bracket 9, and the pole component 2 connected to the conductive portion 4 is located on the outer side of the first shell wall 111, and the conductive portion 4 is provided on the pole component 2 and the active material coating portion 32 is located on the inner side of the shaping bracket 9, and the pole component 2 connected to the conductive portion 4 is located on the outer side of the first shell wall 111, and the conductive portion 4 is provided on the pole component 2 and the active material coating portion 32 is located on the inner side of the shaping bracket 9, and the pole component 2 connected to the conductive portion 4 is located on the outer side of the first shell wall 111, and the conductive portion 4 is provided on the pole component 2 and the active material coating portion 32 is located on the inner side of the shaping bracket 9, and the active material coating portion 32 is provided ... Partial bending and deformation between the material coating parts 32 to form two opening grooves 42 with openings in opposite directions" can specifically include: step S30c11, accompanied by the action of covering the pole component 2 in the direction of the first shell wall 111, so that the conductive part 4 forms two opening grooves 42 with openings in opposite directions on the inner and outer sides of the shaping bracket 9, that is, the conductive part 4 forms an opening groove (that is, the first opening groove 421) on the inner side of the shaping bracket 9, and the conductive part 4 forms another opening groove (that is, the second opening groove 422) on the outer side of the shaping bracket 9. Therefore, by setting the shaping bracket 9, it is convenient for the conductive part 4 to bend out of the two opening grooves 42 with openings in opposite directions, thereby reducing the difficulty of processing. This scheme is applicable to the conductive part 4 consisting of the pole ear part 33 alone, and is also applicable to the conductive part 4 consisting of the pole ear part 33 and the conductive member 41.

[0488] For example, please refer to Fig.39 , the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 satisfies 10% to 60%, and this range is applicable to both the positive pole component 2 and the negative pole component 2. Further, the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 can also satisfy 25% to 40%, for example, the width W2 of the pole component 2 is about 21 mm, the length L2 of the pole component 2 is about 63 mm, and the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 is about 33%.

[0489] Therefore, by setting the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 to meet 10% to 60%, the overall area of ​​the pole component 2 can be relatively large, which is beneficial for the electrical connection area between the pole component 2 and the electrode component 3 to meet relatively large requirements. At the same time, the width of the pole component 2 is relatively small relative to the length. In this way, when connecting the pole component 2 and the electrode component 3, the pole component 2 can be placed with one side edge in the width direction facing the active material coating portion 32. Since the width of the pole component 2 is small, it is beneficial to shorten the distance between the pole component 2 and the active material coating portion 32, thereby shortening the length of the conductive portion 4 and reducing the redundancy of the conductive portion 4.

[0490] For example, please refer to Fig.39, the pole component 2 can be set to: the ratio of the width W2 of the pole component 2 to the width W1 of the first shell wall 111 is 20% to 90%, and this range is applicable to both the positive pole component 2 and the negative pole component 2. Further, the ratio of the width W2 of the pole component 2 to the width W1 of the first shell wall 111 is 70% to 80%. For example, the width W2 of the pole...

Claims

1. A method for assembling a battery cell, characterized in that: The battery cell comprises a shell component, a pole component mounted on the shell component, and an electrode component received in the shell component and connected to the pole component, the shell component comprises a shell body and a shell cover, the shell body has an opening, the shell cover closes the opening, and the shell body or the shell cover comprises a first shell wall, the assembly method comprises: Connecting the electrode component to the pole component; The pole component connected to the electrode component is mounted to the first housing wall.

2. The assembly method according to claim 1, characterized in that: The first shell wall has a mounting hole, the pole component includes a pole body, a transition structure and an insulating structure, the electrode component is connected to the pole body, the transition structure surrounds the pole body and is connected to the first shell wall, and the insulating structure is insulated and fitted between the transition structure and the pole body; The step of connecting the electrode component to the pole component specifically includes: Connecting the electrode component to the pole body; The step of installing the pole component connected to the electrode component to the first shell wall specifically includes: The pole component connected to the electrode component is arranged at the mounting hole, and the transition structure is connected to the first shell wall.

3. The assembly method according to claim 2, characterized in that: The electrode component is connected to the pole body through the conductive part; the step of connecting the electrode component to the pole body specifically includes: Placing the electrode component and the conductive part connected to the electrode component on the inner side of the first shell wall, and passing the conductive part through the mounting hole to the outer side of the first shell wall; The conductive portion extending out of the first housing wall is connected to the pole body of the pole component disposed outside the first housing wall.

4. The assembly method according to claim 3, characterized in that: The steps of arranging the pole component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: The pole component connected to the conductive part is covered on the mounting hole from the outer side of the first shell wall, so that the transition structure stops at the outer side of the first shell wall; The adapter structure is connected to the first shell wall from the outside of the first shell wall.

5. The assembly method according to claim 3 or 4, characterized in that: The end of the shell body opposite to the opening is the first shell wall; the steps of placing the electrode component and the conductive part connected to the electrode component on the inner side of the first shell wall, and passing the conductive part through the mounting hole to the outer side of the first shell wall specifically include: Adjusting the relative positions of the shell body, the electrode component and the conductive part so that the electrode component is located on a side of the conductive part connected thereto away from the shell body, and the opening of the shell body faces the conductive part; The electrode component and the conductive part are installed into the shell body.

6. The assembly method according to claim 3 or 4, characterized in that: The shell cover is the first shell wall; the step of placing the electrode component and the conductive part connected to the electrode component on the inner side of the first shell wall, and passing the conductive part through the mounting hole to the outer side of the first shell wall, and the step of arranging the pole component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall also includes the following steps: Putting the shell body on the outside of the electrode component; The shell body is connected to the shell cover.

7. The assembly method according to claim 6, characterized in that: The inner side of the shell cover is provided with an insulating bracket, and the step of connecting the electrode component with the pole body further includes: before the shell body is put outside the electrode component: Place the electrode component so that the conductive part connected thereto faces downward, and place the shell cover so that the insulating support faces upward; Covering the electrode component supported on the top of the insulating support with an insulating film so that the insulating film is connected to the insulating support; The step of putting the shell body outside the electrode component specifically includes: The shell body is placed with the opening facing downward, and the shell body is covered over the electrode component covered with the insulating film from top to bottom.

8. The assembly method according to claim 2, characterized in that: The steps of arranging the pole component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: Passing the pole component connected to the electrode component through the mounting hole from the inner side of the first shell wall to the outer side of the first shell wall; The pole component passing through the outside of the first shell wall is covered on the mounting hole from the outside of the first shell wall, so that the transition structure stops at the outside of the first shell wall; The adapter structure is connected to the first shell wall from the outside of the first shell wall.

9. The assembly method according to claim 8, characterized in that: The mounting hole is a long strip hole, and the pole component is formed into a long strip structure matching the shape of the mounting hole; The step of passing the pole component connected to the electrode component through the mounting hole from the inner side of the first shell wall to the outer side of the first shell wall specifically includes: Adjusting the placement angle of the pole component so that the thickness direction of the pole component matches the width direction of the mounting hole, and the length direction of the pole component forms an angle with the length direction of the mounting hole; The pole component is made to pass through the mounting hole to the outside of the first shell wall according to the placement angle.

10. The assembly method according to claim 9, characterized in that: The angle between the length direction of the pole component and the length direction of the mounting hole is specifically: Matching the length direction of the pole component with the diagonal direction of the mounting hole; or The length direction of the pole component extends from one length end of the mounting hole to the other length end thereof and is inclined to the length direction of the mounting hole.

11. The assembly method according to any one of claims 8 to 10, characterized in that: The end of the shell body opposite to the opening is the first shell wall; the step of passing the pole component connected to the electrode component from the inner side of the first shell wall through the mounting hole to the outer side of the first shell wall specifically includes: Adjusting the relative positions of the shell body, the electrode component and the pole component so that the electrode component is located on a side of the pole component connected thereto away from the shell body, and the opening of the shell body faces the pole component; The electrode component and the pole component are installed into the shell body.

12. The assembly method according to any one of claims 8 to 10, characterized in that: The shell cover is the first shell wall; after the step of passing the pole component connected to the electrode component from the inner side of the first shell wall through the mounting hole to the outer side of the first shell wall, the step further includes: Putting the shell body on the outside of the electrode component; Connecting the shell body to the shell cover; The step of connecting the shell body to the shell cover is performed before the step of covering the pole component penetrating the outside of the first shell wall on the mounting hole from the outside of the first shell wall so that the transition structure stops at the outside of the first shell wall.

13. The assembly method according to any one of claims 8 to 10, characterized in that: The shell cover is the first shell wall; after the step of passing the pole component connected to the electrode component from the inner side of the first shell wall through the mounting hole to the outer side of the first shell wall, the step further includes: Putting the shell body on the outside of the electrode component; Connecting the shell body to the shell cover; The step of putting the shell body on the outside of the electrode component is performed after the step of connecting the adapter structure and the first shell wall from the outside of the first shell wall.

14. The assembly method according to claim 2, characterized in that: The steps of arranging the pole component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: Placing the pole component connected to the electrode component and the electrode component on the inner side of the first shell wall; The pole component connected to the electrode component is covered on the mounting hole from the inner side of the first shell wall, so that the transition structure stops at the inner side of the first shell wall; The adapter structure is connected to the first shell wall from the outside of the first shell wall.

15. The assembly method according to claim 12, characterized in that: The end of the shell body opposite to the opening is the first shell wall; the step of placing the pole component connected to the electrode component and the electrode component on the inner side of the first shell wall specifically includes: Adjusting the relative positions of the shell body, the electrode component and the pole component so that the electrode component is located on a side of the pole component connected thereto away from the shell body, and the opening of the shell body faces the pole component; The electrode component and the pole component are installed into the shell body.

16. The assembly method according to claim 12, characterized in that: The shell cover is the first shell wall; after the step of connecting the adapter structure to the first shell wall from the outside of the first shell wall, the step further includes: Putting the shell body on the outside of the electrode component; The shell body is connected to the shell cover.

17. The assembly method according to any one of claims 2 to 16, characterized in that: The insulating structure includes a sealing structure, which is arranged around the peripheral side of the transition structure facing the pole body and is at least partially clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall. Before the step of connecting the electrode component to the pole body, the step also includes: The pole component is provided.

18. The assembly method according to claim 17, characterized in that: The pole body comprises a peripheral portion, the transition structure is clamped on both sides of the peripheral portion in the inner and outer directions of the first shell wall by the insulating structure, and at least a part of the sealing structure is clamped between the peripheral portion facing the electrode component and the transition structure; The step of providing the pole component specifically includes: The transition structure is assembled or reshaped to complete the clamping of the sealing structure by the peripheral portion and the transition structure.

19. The assembly method according to claim 17, characterized in that: The transition structure includes a matching ring portion, the pole body includes a penetration portion penetrated by the matching ring portion, and an inner limit portion and an outer limit portion connected to the penetration portion and clamped on both inner and outer sides of the matching ring portion, and at least a portion of the sealing structure is clamped between the matching ring portion and the inner limit portion. The steps of providing the pole component specifically include: The pole body is assembled or shaped to complete the clamping of the sealing structure by the matching ring portion and the pole body.

20. The assembly method according to any one of claims 2 to 16, characterized in that: The first shell wall has a mounting hole, a sealing ring is arranged around the mounting hole, and the sealing ring is clamped between the pole component and the first shell wall; The steps of arranging the pole component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: Installing the sealing ring at the mounting hole of the first shell wall; The pole component connected to the electrode component is covered on the mounting hole so that the sealing ring is sandwiched between the pole component and the first shell wall.

21. The assembly method according to any one of claims 2 to 20, characterized in that: The transition structure is formed into a long strip extending along the length direction of the first shell wall, and the contour shape of the pole body matches the contour shape of the transition structure; Alternatively, the transition structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is arranged at the length center of the transition structure and is circular; Before the step of connecting the electrode component to the pole body, the step further includes: Providing the pole body and the transition structure; Assemble the pole components.

22. The assembly method according to claim 1, characterized in that: The pole component comprises a pole body, the pole body comprises a first pole piece and a second pole piece, the second pole piece is mounted on the first shell wall, the first pole piece is mounted on the second pole piece, and the electrode component is connected to the first pole piece; The step of connecting the electrode component to the pole component specifically includes: Connecting the electrode component to the first pole component; The step of installing the pole component connected to the electrode component to the first shell wall specifically includes: The first pole member connected to the electrode component is assembled and connected to the second pole member installed on the first housing wall.

23. The assembly method according to claim 22, characterized in that: The second pole piece defines a matching hole, and the first pole piece cover is disposed on a side of the second pole piece away from the electrode component and covers the matching hole; The step of assembling and connecting the first pole piece connected to the electrode component to the second pole piece installed on the first shell wall specifically includes: The first pole piece connected to the electrode component is covered on the fitting hole from the outer side of the second pole piece; The first pole piece is connected to the second pole piece from the outside of the first housing wall.

24. The assembly method according to claim 23, characterized in that: The step of connecting the electrode component to the first pole component specifically includes: Placing the electrode component and the conductive part on the inner side of the first shell wall, and passing the conductive part through the matching hole to the outer side of the second pole piece; The conductive portion extending out of the first shell wall is connected to the first pole member disposed on the outside of the first shell wall.

25. The assembly method according to claim 23, characterized in that: Before the step of covering the first pole piece connected to the electrode component on the fitting hole from the outside of the second pole piece, the method further includes: Placing the electrode component and the first pole component connected to the electrode component on the inner side of the first shell wall; The first pole piece is passed through the matching hole to the outside of the second pole piece.

26. The assembly method according to any one of claims 1 to 25, characterized in that: The pole ear portion of the electrode component includes a gathered portion formed by stacking and connecting multiple pole ear sheets, and the pole ear portion is connected to the pole column component through the gathered portion; before the step of connecting the electrode component to the pole column component, the step further includes: A plurality of tab sheets in the tab portion of the electrode component are stacked and connected to form a gathered portion.

27. The assembly method according to claim 26, characterized in that: The electrode component includes a plurality of electrode assemblies; and the step of connecting the multiple layers of electrode tab sheets in the electrode tab portion of the electrode component to form a gathered portion specifically includes: stacking a plurality of the electrode assemblies along a thickness direction of the electrode assembly; The multi-layered tab sheets of at least two electrode assemblies are stacked and connected to form the gathered portion.

28. The assembly method according to claim 26 or 27, characterized in that: The pole ear portion of the electrode component includes a gathered portion formed by stacking and connecting multiple pole ear sheets, the pole column component includes a pole column body, and a surface of the pole column body facing one end of the electrode component is an inner end surface of the pole column body; the steps of connecting the electrode component to the pole column component specifically include: Laying the gathered portion on the inner end surface of the pole body; The gathered portion is connected to the inner end surface of the pole body.

29. The assembly method according to claim 28, characterized in that: The shell component has a receiving cavity therein, and the pole component forms a receiving groove which is recessed relative to the first shell wall in a direction away from the electrode component and is open in a direction toward the electrode component; Before the step of laying the gathered portion on the inner end surface of the pole body, the method further includes: The retracted portion is installed into the receiving groove.

30. The assembly method according to claim 28 or 29, characterized in that: The electrode component includes a plurality of electrode assemblies stacked and arranged; before the step of laying the gathered portion on the inner end surface of the pole body, the method further includes: The pole component is arranged on a side of the electrode component extending out of the pole ear portion; The angle of the pole component is adjusted so that the normal direction of the inner end surface of the pole body approaches the stacking direction of the plurality of electrode assemblies.

31. The assembly method according to any one of claims 1 to 25, characterized in that: The pole component includes a pole body, the electrode component is connected to the pole body through a conductive part, the conductive part includes a pole ear part composed of a pole ear sheet of the electrode component, and a conductive member connected to the pole ear part, and the pole ear part is connected to the pole body through the conductive member; the step of connecting the electrode component to the pole component specifically includes: The pole ear portion is connected to the conductive member.

32. The assembly method according to claim 31, characterized in that: The electrode component includes a plurality of electrode assemblies; before the step of connecting the electrode ear portion with the conductive member, the step further includes: stacking a plurality of the electrode assemblies along a thickness direction of the electrode assembly; The multi-layered tab sheets of at least two electrode assemblies are stacked and gathered together to form a stacked sheet portion.

33. The assembly method according to claim 31 or 32, characterized in that: The electrode ear portion of the electrode component includes a stacked sheet portion formed by stacking and gathering multiple electrode ear sheets; before the step of connecting the electrode ear portion to the conductive member, the step further includes: The multiple layers of tab sheets in the stacked sheet portion are connected to form a gathered portion.

34. The assembly method according to claim 33, characterized in that: The conductive member includes a first connecting section, and the step of connecting the pole ear portion to the conductive member specifically includes: Overlaying the gathered portion on one side of the first connecting section in the rear direction of the thickness; The gathered portion is connected to the first connecting section.

35. The assembly method according to any one of claims 31 to 33, characterized in that: The conductive member includes a first connecting section, and the first connecting section includes two clamping parts; the step of connecting the pole ear part with the conductive member specifically includes: clamping the end of the pole ear portion of the pole ear portion between the two clamping portions; The pole ear end of the pole ear portion is connected to the two clamping portions into one body.

36. The assembly method according to claim 34 or 35, characterized in that: After the step of connecting the pole ear portion to the conductive member, the step further includes: The angle of the pole component is adjusted so that the inner end surface of the pole body faces the electrode component and the first connecting section of the conductive member is supported on the side of the pole ear away from the pole body.

37. The assembly method according to any one of claims 31 to 36, characterized in that: The step of connecting the electrode component to the pole component also includes: The conductive member is connected to the pole body.

38. The assembly method according to claim 37, characterized in that: The pole component includes a pole body, and a surface of the pole body facing one end of the electrode component is an inner end surface of the pole body; the conductive member includes a second connecting section, and the step of connecting the conductive member to the pole body specifically includes: Laying the second connecting section on the inner end surface of the pole body; The second connecting section is connected to the inner end surface of the pole body.

39. The assembly method according to claim 38, characterized in that: The pole component forms a receiving groove which is recessed relative to the first shell wall in a direction away from the electrode component and is open in a direction toward the electrode component; Before the step of laying the second connecting section on the inner end surface of the pole body, the method further includes: Install the second connecting section into the receiving groove.

40. The assembly method according to claim 38 or 39, characterized in that: The electrode component includes a plurality of electrode assemblies stacked together; before the step of laying the second connecting section on the inner end surface of the pole body, the method further includes: The pole component is arranged on a side of the electrode component extending out of the pole ear portion; The angle of the pole component is adjusted so that the normal direction of the inner end surface of the pole body approaches the stacking direction of the plurality of electrode assemblies.

41. The assembly method according to any one of claims 2 to 21, characterized in that: The electrode component is connected to the pole body through a conductive part, the conductive part includes a pole ear part composed of a pole ear sheet of the electrode component, and a conductive member connected to the pole ear part, the position of the inner end surface of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, and the inner end surface of the pole body protrudes from the surrounding area toward the electrode component; The conductive member includes a first conductive segment laid on the inner end surface of the pole body, and a second conductive segment staggered from the inner end surface of the pole body, the second conductive segment protruding in a direction away from the electrode component relative to the first conductive segment; The step of connecting the electrode component to the pole component also includes: Reshaping the conductive member so that the conductive member includes the first conductive segment and the second conductive segment; The tab portion is connected to the second conductive segment.

42. The assembly method according to any one of claims 2 to 21, characterized in that: The electrode component is connected to the pole body through a conductive part, the conductive part includes a pole ear part composed of a pole ear sheet of the electrode component, and a conductive member connected to the pole ear part, the position of the inner end surface of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, the surrounding area protrudes from the inner end surface of the pole body toward the direction of the electrode component, and the inner end surface of the pole body includes a matching area opposite to the annular hole of the surrounding area; The conductive member includes a first conductive segment laid in the matching area, the conductive member includes a third conductive segment staggered from the matching area, the third conductive segment protrudes relative to the first conductive segment toward the electrode component, and the electrode ear is connected to the third conductive segment; The step of connecting the electrode component to the pole component also includes: Reshaping the conductive member so that the conductive member includes the first conductive segment and the third conductive segment; The tab portion is connected to the third conductive segment.

43. The assembly method according to any one of claims 1 to 40, characterized in that: The electrode component includes an active material coating portion, the active material coating portion is connected to the pole component through a conductive portion, the conductive portion is bent to form at least two open grooves, the opening directions of two adjacent open grooves are different, and the two adjacent open grooves are adjacent in the direction from the pole component to the active material coating portion; The step of installing the pole component connected to the electrode component to the first shell wall specifically includes: The conductive portion is shaped so that the conductive portion is bent to form the at least two open grooves.

44. The assembly method according to claim 43, characterized in that: The step of shaping the conductive portion so that the conductive portion is bent to form the at least two open grooves specifically includes: The conductive portion is shaped so that the conductive portion is bent to form two opening grooves with openings facing opposite directions.

45. The assembly method according to claim 44, characterized in that: The battery cell comprises a shaping bracket arranged on a side of the electrode component close to the pole component, the shaping bracket has a through hole, wherein, in a state where the conductive part is penetrated through the through hole, the active material coating part connected to the conductive part is located on the inner side of the shaping bracket, and the pole component connected to the conductive part is located on the outer side of the first shell wall, the step of shaping the conductive part so that the conductive part is bent to form two opening grooves with openings facing opposite directions specifically comprises: As the pole component is covered toward the first shell wall, the conductive portion forms two opening grooves with openings in opposite directions on the inner and outer sides of the shaping bracket.

46. ​​A battery cell, characterized in that: The invention is manufactured by using the assembly method according to any one of claims 1 to 45.

47. The battery cell according to claim 46, characterized in that The shell body is in a semi-closed cylindrical shape and has the opening at one end, and the end of the shell body opposite to the opening serves as the first shell wall, or the shell cover is in a flat plate shape and serves as the first shell wall.

48. The battery cell according to claim 46 or 47, characterized in that: It also includes a pressure relief device, which is arranged on the shell component and is located on the same side or the opposite side as the pole component.

49. A battery, characterized in that: Comprising a battery cell according to any one of claims 46-48.

50. The battery according to claim 50, characterized in that The battery comprises a box body, the battery cells are multiple and are accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole component is arranged on the side of the shell component facing the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

51. An electrical device, characterized in that: Comprising a battery according to claim 49 or 50.

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