Assembly method for battery cell, and battery cell, battery and electric device

Abstract

An assembly method for a battery cell, and a battery cell, a battery and an electric device, which belong to the technical field of batteries. The battery cell comprises a casing component, a terminal post component mounted to the casing component, and an electrode component accommodated in the casing component and connected to the terminal post component, wherein the casing component comprises a casing body and a casing cover, the casing body has an opening, the casing cover seals the opening, and the casing body or the casing cover comprises a first casing wall. The assembly method comprises: connecting an electrode component to a terminal post component; and mounting to a first casing wall the terminal post component connected to the electrode component.

Description

Assembly method of battery cell, battery cell, battery and electrical device

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202410706366.4, filed on May 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and in particular to a method for assembling a battery cell, a battery cell, a battery, and an electrical device. Background Technology

[0004] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. A power battery consists of several individual battery cells; however, the reliability of these individual cells needs improvement, which in turn necessitates enhancing the overall reliability of the power battery.

[0005] Summary of the Invention

[0006] This application provides a method for assembling a battery cell, a battery cell, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0007] In a first aspect, embodiments of this application provide a method for assembling a battery cell. The battery cell includes a housing component, a terminal component mounted on the housing component, and an electrode component housed in the housing component and connected to the terminal component. The housing component includes a shell body and a shell cover. The shell body has an opening, and the shell cover closes the opening. The shell body or the shell cover includes a first shell wall. The assembly method includes: connecting the electrode component to the terminal component; and installing the terminal component connected to the electrode component onto the first shell wall.

[0008] In the above technical solution, the connection between the terminal post and the electrode component is completed first, followed by the connection between the terminal post and the housing component, rather than pre-assembling the terminal post and the housing component first and then connecting the electrode component to the terminal post. This shortens the length of the conductive part connecting the terminal post and the electrode component, reduces the redundancy of the conductive part within the housing component, and reduces the space occupied by the conductive part within the housing component. This helps to improve the energy density of the battery cell and reduces the risk of short circuits caused by the conductive part being inserted backwards into the active material coating of the electrode component, thus improving the reliability of the battery cell. Furthermore, this assembly method allows for battery cell assembly regardless of whether the terminal post is placed on the housing body or the housing cover, allowing for flexible selection of the terminal post installation position on the housing component. When the terminal post is placed on the housing body, it helps to reduce cracking at the connection between the housing body and the housing cover, improving the reliability of the battery cell.

[0009] In some embodiments, the first housing wall has a mounting hole, the electrode component includes an electrode body, a transition structure and an insulating structure, the electrode component is connected to the electrode body, the transition structure surrounds the electrode body and is connected to the first housing wall, and the insulating structure is insulatingly fitted between the transition structure and the electrode body; the step of connecting the electrode component to the electrode component specifically includes: connecting the electrode component to the electrode body; the step of installing the electrode component connected to the electrode component to the first housing wall specifically includes: placing the electrode component connected to the electrode component at the mounting hole, and connecting the transition structure to the first housing wall.

[0010] In the above technical solution, the pole component has a simple structure and is easy to process. Since it includes two parts, the pole body and the adapter structure, the shape and size of the pole body and the adapter structure can be designed separately based on different factors to flexibly adapt to the connection requirements of different types of housing components and electrode components, thereby increasing the applicability of the pole component.

[0011] In some embodiments, the electrode component is connected to the electrode post body via a conductive portion; the step of connecting the electrode component to the electrode post body specifically includes: placing the electrode component and the conductive portion connected to the electrode component inside the first housing wall, and extending the conductive portion through the mounting hole to the outside of the first housing wall; connecting the conductive portion extending to the outside of the first housing wall to the electrode post body of the electrode post component placed on the outside of the first housing wall.

[0012] In the above technical solution, since the conductive part is not yet connected to the electrode component when it passes through the mounting hole, it is convenient for the conductive part to pass through the mounting hole, thus improving the ease of operation. Moreover, since the welding position between the electrode component and the conductive part is located on the outer side of the first shell wall, the problem of conductive debris generated during the welding process entering the interior of the shell and damaging the electrode component can be mitigated.

[0013] In some embodiments, the step of placing the electrode post member connected to the electrode member at the mounting hole and connecting the adapter structure to the first shell wall specifically includes: covering the mounting hole from the outside of the first shell wall with the electrode post member connected to the conductive part, so that the adapter structure abuts against the outside of the first shell wall; and connecting the adapter structure to the first shell wall from the outside of the first shell wall.

[0014] In the above technical solution, since the pole piece is installed on the mounting hole from the outside of the first housing wall, the adapter structure abuts against the outside of the first housing wall, and the adapter structure is connected to the first housing wall from the outside of the first housing wall, so as to facilitate the assembly and connection of the pole piece and the first housing wall, which is beneficial to improving the connection reliability of the pole piece and the first housing wall.

[0015] In some embodiments, the end of the housing opposite to the opening is a first housing wall; the step of placing the electrode component and the conductive part connected to the electrode component inside the first housing wall, and passing the conductive part through the mounting hole to the outside of the first housing wall specifically includes: adjusting the relative positions of the housing, 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 housing, and the opening of the housing faces the conductive part; and installing the electrode component and the conductive part into the housing.

[0016] In the above technical solution, by placing the electrode post component at the end opposite to the opening of the casing, it is beneficial to improve the cracking problem at the connection between the casing and the cover, and improve the reliability of the battery cell.

[0017] In some embodiments, the cover is a first shell wall; between the steps of placing the electrode component and the conductive part connected to the electrode component inside the first shell wall and passing the conductive part through the mounting hole to the outside of the first shell wall, and 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, the method further includes the steps of: fitting the shell body over the electrode component; and connecting the shell body to the cover.

[0018] In the above technical solution, by first connecting the shell body and the shell cover, and then connecting the electrode post component to the shell cover, the shell body can be used to house the electrode component and support the shell cover. This facilitates the positioning and support of the shell cover, so as to facilitate the connection between the shell cover and the adapter structure and improve the connection reliability between the shell cover and the electrode post component.

[0019] In some embodiments, the inner side of the cover has an insulating support, and the step of connecting the electrode component to the electrode post body further includes the following steps before covering the electrode component: placing the electrode component with the conductive part connected to it facing downwards, and placing the cover with the insulating support facing upwards; 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 covering the electrode component with the cover specifically includes: placing the cover with the opening facing downwards, and covering the electrode component covered with the insulating film from top to bottom.

[0020] In the above technical solution, when fitting the housing onto the electrode component, since the housing cover is not connected to the electrode component, an insulating bracket is set on the inner side of the housing cover to support the electrode component from the bottom. This eliminates the need for other limiting clamps and avoids the problem of the electrode component separating from the housing cover. Therefore, during assembly, the housing body can be directly fitted from top to bottom, which simplifies the assembly process and reduces the use of limiting clamps.

[0021] In some embodiments, the step of placing the electrode post connected to the electrode component at the mounting hole and connecting the adapter structure to the first housing wall specifically includes: extending the electrode post connected to the electrode component from the inside of the first housing wall through the mounting hole to the outside of the first housing wall; covering the mounting hole with the electrode post extending to the outside of the first housing wall so that the adapter structure abuts against the outside of the first housing wall; and connecting the adapter structure to the first housing wall from the outside of the first housing wall.

[0022] In the above technical solution, since the electrode component and the terminal post component are connected first, and then the terminal post 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 terminal post component. In other words, when connecting the electrode component and the terminal post component, the terminal post component and the electrode component are not located on opposite sides of the first shell wall. This helps to further shorten the length of the conductive part, reduce the redundancy of the conductive part after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell. Moreover, since the welding position of the terminal post component and the electrode component is located on the outside of the shell, the problem of conductive debris generated during the welding process entering the interior of the shell and damaging the electrode component can be improved. Furthermore, since the terminal post component covers the mounting hole from the outside of the first shell wall, the adapter structure abuts against 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, which facilitates the assembly and connection of the terminal post component and the first shell wall, thus improving the connection reliability of the terminal post component and the first shell wall.

[0023] In some embodiments, the mounting hole is an elongated hole, and the electrode post component is formed into an elongated structure that matches the shape of the mounting hole; the step of extending the electrode post component connected to the electrode component from the inside of the first shell wall through the mounting hole to the outside of the first shell wall specifically includes: adjusting the placement angle of the electrode post component so that the thickness direction of the electrode post component matches the width direction of the mounting hole, and the length direction of the electrode post component forms an angle with the length direction of the mounting hole; and extending the electrode post component from the mounting hole to the outside of the first shell wall according to the placement angle.

[0024] In the above technical solution, by first adjusting the placement angle of the terminal component and then passing it through the mounting hole, the terminal component can pass smoothly through the mounting hole, improving assembly efficiency and reducing the risk of collision and scratches between the terminal component and the housing component. Furthermore, by setting the terminal component as an elongated structure that matches the shape of the mounting hole, the terminal component can be adjusted to pass through the mounting hole at an angle where its thickness direction is close to the width direction of the mounting hole. After passing through the mounting hole, the thickness direction of the terminal component is rotated to be close to the thickness direction of the first housing wall. This reduces the space required for the terminal component's flipping movement, thereby shortening the length of the conductive part, saving materials, reducing costs, and reducing redundancy in the conductive part, thus reducing the space occupied by the conductive part in the cavity and improving the energy density of the battery cell.

[0025] In some embodiments, making the length direction of the pole piece form an angle with the length direction of the mounting hole specifically means: matching the length direction of the pole piece with the diagonal direction of the mounting hole; or extending the length direction of the pole piece from one end of the mounting hole to the other end of the length, and inclined to the length direction of the mounting hole.

[0026] In the above technical solution, the length direction of the pole component is arranged as described above, which facilitates the pole component to pass smoothly through the mounting hole, improves assembly efficiency, and reduces the risk of collision and scratch between the pole component and the housing component.

[0027] In some embodiments, the end of the housing opposite to the opening is a first housing wall; the step of passing the electrode post component connected to the electrode component through the mounting hole from the inside of the first housing wall to the outside of the first housing wall specifically includes: adjusting the relative positions of the housing, the electrode component, and the electrode post component so that the electrode component is located on the side of the electrode post component connected to it away from the housing, and the opening of the housing faces the electrode post component; and installing the electrode component and the electrode post component into the housing.

[0028] In the above technical solution, by placing the electrode post component at the end opposite to the opening of the casing, it is beneficial to improve the cracking problem at the connection between the casing and the cover, and improve the reliability of the battery cell.

[0029] In some embodiments, the cover is a first shell wall; after the step of passing the electrode post member connected to the electrode member through the mounting hole from the inside of the first shell wall to the outside of the first shell wall, the method further includes the steps of: fitting the shell body over the electrode member; and connecting the shell body to the cover; wherein the step of connecting the shell body to the cover is performed before the step of covering the electrode post member that has passed through the outside of the first shell wall with the mounting hole from the outside of the first shell wall so that the adapter structure abuts against the outside of the first shell wall.

[0030] In the above technical solution, since the connection between the shell body and the shell cover is completed first, and then the connection between the pole component and the shell cover is carried out, the shell body can be used to support the shell cover. This facilitates the positioning and support of the shell cover, so as to facilitate the connection between the shell cover and the adapter structure and improve the connection reliability between the shell cover and the pole component.

[0031] In some embodiments, the cover is a first shell wall; after the step of passing the electrode post member connected to the electrode member through the mounting hole from the inside of the first shell wall to the outside of the first shell wall, the method further includes the steps of: fitting the shell body over the electrode member; and connecting the shell body to the cover; wherein the step of fitting the shell body over the electrode member is performed after the step of connecting the adapter structure to the first shell wall from the outside of the first shell wall.

[0032] In the above technical solution, since the pole component is connected to the cover first, and then the shell body is connected to the cover, the force connecting the pole component and the cover will not be transmitted to the connection point between the shell body and the cover, thus improving the cracking problem at the connection point between the shell body and the cover.

[0033] In some embodiments, the step of placing the electrode post connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically includes: placing both the electrode post connected to the electrode component and the electrode component inside the first shell wall; covering the mounting hole from the inside of the first shell wall with the electrode post connected to the electrode component so that the adapter structure abuts against the inside of the first shell wall; and connecting the adapter structure to the first shell wall from the outside of the first shell wall.

[0034] In the above technical solution, since the terminal post component is installed on the mounting hole from the inside of the first housing wall, neither the conductive part nor the terminal post component needs to be penetrated through the mounting hole, thereby reducing processing steps and operational difficulty. Furthermore, since the adapter structure connects to the first housing wall from the outside, it facilitates the assembly and connection of the terminal post component and the first housing wall, improving the connection reliability. In addition, since the electrode component and terminal post component are connected first, and then the terminal post component and electrode component are placed inside the first housing wall, there is no need to consider avoiding the first housing wall when connecting the electrode component and terminal post component. In other words, when connecting the electrode component and terminal post component, the terminal post component and electrode component are not located on opposite sides of the first housing wall, which helps to further shorten the length of the conductive part, reduce redundancy of the conductive part after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell. Moreover, since the welding position of the terminal post component and electrode component is located on the outside of the housing, it can mitigate the problem of conductive debris generated during welding entering the interior of the housing and damaging the electrode component.

[0035] In some embodiments, the end of the housing opposite to the opening is the first housing wall; the step of placing the electrode post component and the electrode component connected to the electrode component inside the first housing wall specifically includes: adjusting the relative positions of the housing, the electrode component and the electrode post component so that the electrode component is located on the side of the electrode post component connected to it away from the housing, and the opening of the housing faces the electrode post component; and installing the electrode component and the electrode post component into the housing.

[0036] In the above technical solution, by placing the electrode post component in the housing, it is beneficial to improve the cracking problem at the connection between the housing and the cover, and improve the reliability of the battery cell.

[0037] In some embodiments, the cover is a first shell wall; after the step of connecting the adapter structure to the first shell wall from the outside, the method further includes the steps of: fitting the shell body over the electrode component; and connecting the shell body to the cover.

[0038] In the above technical solution, by first connecting the electrode component to the housing cover and then assembling the housing body to the housing cover, when connecting the electrode component to the housing cover, since the outer side of the electrode component is not yet covered by the housing body, it can contact the electrode component. By applying force to the electrode component, the electrode component is stopped against the housing cover. Alternatively, the conductive part can be lengthened so that the force is applied directly to the electrode component from the inside of the housing cover, so that the electrode component is stopped against the housing cover, thereby enabling the electrode component and the housing cover to be reliably and effectively connected.

[0039] In some embodiments, the insulating structure includes a sealing structure member surrounding the peripheral side of the adapter structure facing the electrode body and at least partially sandwiched between the adapter structure and the electrode body in the inward and outward directions of the first housing wall. The step of connecting the electrode component to the electrode body further includes providing the electrode component.

[0040] In the above technical solution, by first processing the electrode component into a form where the transition structure and the electrode body are sealed by a sealing structure before the step of "connecting the electrode component to the electrode body", the subsequent step of "setting the electrode component connected to the electrode component at the mounting hole and connecting the transition structure to the first shell wall" eliminates the need for a sealing element between the transition structure and the first shell wall. This avoids the need to apply significant sealing pressure to meet the compression requirements of the sealing element, thereby reducing the stress on the first shell wall. Furthermore, when the first shell wall is the end opposite the opening to the shell body, the stress at the connection between the first and second shell walls, as well as the stress on the second shell wall, can also be reduced, thus helping to ensure the reliability of the shell body and reducing the shell body wall thickness and cost.

[0041] In some embodiments, the electrode body includes a peripheral portion, the adapter structure is clamped on both sides of the peripheral portion in the inward and outward directions of the first shell wall by 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 adapter structure; the step of providing the electrode component specifically includes: assembling or shaping the adapter structure to complete the clamping of the sealing structure by the peripheral portion and the adapter structure.

[0042] In the above technical solution, only the adapter structure needs to be operated on, without operating the electrode body, to provide the electrode component. This simplifies the operation, makes the electrode component easier to process, and allows for simple and effective fixation and insulating fit between the electrode body and the adapter structure. Furthermore, the sealing structure can be positioned at the mating point between the adapter structure and the electrode body, facilitating a shorter path for sealing this mating point, improving sealing reliability. It also allows for a smaller sealing structure size and sealing area, making compression sealing easier, reducing the likelihood of seal failure, and improving sealing performance. Moreover, since at least a portion of the sealing structure is clamped between the peripheral side facing the electrode component and the adapter structure, the sealing structure can seal from the peripheral side facing the receiving cavity, more effectively suppressing electrolyte leakage from the mating point between the electrode body and the adapter structure, thereby improving the sealing effect.

[0043] In some embodiments, the adapter structure includes a mating ring portion, and the pole body includes a through portion passing through the mating ring portion, and an inner limiting portion and an outer limiting portion connected to the through portion and clamped on the inner and outer sides of the mating ring portion. The step of providing the pole component by clamping at least a portion of the sealing structure between the mating ring portion and the inner limiting portion 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.

[0044] In the above technical solution, only the electrode body needs to be operated on, without operating the adapter structure, to provide the electrode component. This simplifies the operation, makes the electrode component easier to process, and allows for simple and effective fixation and insulating fit between the electrode body and the adapter structure. Furthermore, by using the mating position between the electrode body and the mating ring to hold the sealing structure, the sealing structure can be positioned at the mating position between the adapter structure and the electrode body. This facilitates sealing at the mating position of the adapter structure and the electrode body via a shorter path, improving sealing reliability. It also allows for a smaller size and sealing area of ​​the sealing structure, making compression sealing easier and reducing the likelihood of seal failure, thus improving sealing performance. Moreover, since at least a portion of the sealing structure is held between the mating ring and the inner limiting portion, the sealing structure can seal from the side of the mating ring facing the receiving cavity, more effectively suppressing electrolyte leakage from the mating position between the electrode body and the adapter structure, thereby improving the sealing effect.

[0045] In some embodiments, the first housing wall has a mounting hole, and a sealing ring is provided around the mounting hole, with the sealing ring clamped between the electrode post component and the first housing wall; the step of placing the electrode post component connected to the electrode component at the mounting hole and connecting the adapter structure to the first housing wall specifically includes: installing the sealing ring at the mounting hole of the first housing wall; and covering the mounting hole with the electrode post component connected to the electrode component so that the sealing ring is clamped between the electrode post component and the first housing wall.

[0046] In the above technical solution, the pole post component has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall.

[0047] In some embodiments, the adapter structure is formed as an elongated strip extending along the length direction of the first shell wall, and the outline shape of the electrode body matches the outline shape of the adapter structure; or, the adapter structure is formed as an elongated strip extending along the length direction of the first shell wall, and the electrode body is located at the length center of the adapter structure and is circular; the step of connecting the electrode component to the electrode body further includes: providing the electrode body and the adapter structure; assembling the electrode component.

[0048] In the above technical solutions, when the outline shape of the electrode body is formed into an elongated shape that matches the outline shape of the adapter structure, the area of ​​the electrode body is larger, which is beneficial to increasing the connection area between the conductive part and the electrode body, thereby improving charging performance. Conversely, when the electrode body is located at the center of the elongated adapter structure and is circular, it is beneficial to reduce the connection area between the electrode body and the adapter structure, improve the uniformity of force at the connection point, and thus improve the connection reliability between the electrode body and the adapter structure.

[0049] In some embodiments, the electrode component includes an electrode body, the electrode body includes a first electrode member and a second electrode member, the second electrode member is mounted on a first housing wall, the first electrode member is mounted on the second electrode member, and the electrode component is connected to the first electrode member; the step of connecting the electrode component to the electrode component specifically includes: connecting the electrode component to the first electrode member; the step of installing the electrode component connected to the electrode component to the first housing wall specifically includes: assembling the first electrode member connected to the electrode component to the second electrode member mounted on the first housing wall.

[0050] In the above technical solution, by dividing the electrode body into two parts for assembly and connection, when assembling the battery cell, the first electrode component can be connected to the electrode component first, and the second electrode component can be connected to the first shell wall first, and then the first electrode component and the second electrode component can be connected. This helps to shorten the conductive part, reduce the redundancy of the conductive part and the material cost.

[0051] In some embodiments, the second electrode member defines a mating hole, and the first electrode member covers the side of the second electrode member opposite to the electrode member and seals the mating hole; the step of assembling the first electrode member connected to the electrode member to the second electrode member mounted on the first housing wall specifically includes: covering the mating hole from the outside of the second electrode member with the first electrode member connected to the electrode member; connecting the first electrode member from the outside of the first housing wall to the second electrode member.

[0052] In the above technical solution, by setting a mating hole, the first pole piece and the second pole piece can be connected from the outside of the pole piece component, which helps to improve the connection convenience and connection reliability of the first pole piece and the second pole piece.

[0053] In some embodiments, the step of connecting the electrode component to the first electrode post specifically includes: placing the electrode component and the conductive part inside the first housing wall, and extending the conductive part through the mating hole to the outside of the second electrode post; connecting the conductive part extending to the outside of the first housing wall to the first electrode post placed on the outside of the first housing wall.

[0054] In the above technical solution, since the conductive part is not yet connected to the first electrode post when it passes through the mating hole, it is convenient for the conductive part to pass through the mating hole, thus improving the ease of operation. Moreover, since the welding position between the first electrode post and the conductive part is located on the outer side of the first shell wall, the problem of conductive debris generated during the welding process entering the interior of the shell and damaging the electrode components can be mitigated.

[0055] In some embodiments, before the step of covering the mating hole with the first electrode post connected to the electrode component from the outside of the second electrode post, the method further includes: placing the electrode component and the first electrode post connected to the electrode component inside the first housing wall; and extending the first electrode post through the mating hole to the outside of the second electrode post.

[0056] In the above technical solution, since the electrode component is connected to the first terminal post first, and then the first terminal post is passed through the mating hole, there is no need to consider avoiding the first housing wall when connecting the electrode component and the first terminal post. In other words, when connecting the electrode component and the first terminal post, the second terminal post and the electrode component are not located on opposite sides of the first housing wall. This helps to further shorten the length of the conductive part, reduce the redundancy of the conductive part after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell. Moreover, since the welding position of the electrode component and the first terminal post is located on the outside of the housing, the problem of conductive debris generated during the welding process entering the interior of the housing and damaging the electrode component can be mitigated.

[0057] In some embodiments, the tab portion of the electrode component includes a folded portion formed by stacking and connecting multiple layers of tab sheets, and the tab portion is connected to the electrode post component through the folded portion; before the step of connecting the electrode component to the electrode post component, the method further includes: stacking and connecting multiple layers of tab sheets in the tab portion of the electrode component to form the folded portion.

[0058] In the above technical solution, by connecting multiple layers of tabs in the tab part to form a gathered part, the gathered part can present a plate shape with multiple layers of tabs connected together and having a certain rigidity, rather than a loose and scattered multi-layer foil shape. This facilitates the perforation operation of the tab part, such as the operation of inserting mounting holes or mating holes into the tab part, improving processing efficiency. On the other hand, it makes the welding of the gathered part and the pole component more reliable, and it is not easy for pores to form in the weld, which can improve the connection reliability and conductivity of the weld, making the conductivity between the electrode component and the pole component more stable and reliable.

[0059] In some embodiments, the electrode component includes a plurality of electrode assemblies; the step of connecting multiple layers of electrode tabs in the tab portion of the electrode component to form a folded portion specifically includes: stacking a plurality of electrode assemblies along the thickness direction of the electrode assemblies; and stacking and connecting the multiple layers of electrode tabs of at least two electrode assemblies to form a folded portion.

[0060] In the above technical solution, on the one hand, the total number of gathering parts can be reduced, the connection steps between the gathering parts and the electrode 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 electrode tabs and the active material coating part caused by the asynchronous movement of the electrode tabs of different electrode components when the gathering parts are manufactured first and then the electrode components are stacked.

[0061] In some embodiments, the tab portion of the electrode component includes a gathering portion formed by stacking and connecting multiple layers of tab sheets, and the pole component includes a pole body, wherein the surface of the pole body facing the electrode component is the inner end face of the pole body; the step of connecting the electrode component and the pole component specifically includes: laying the gathering portion on the inner end face of the pole body; and connecting the gathering portion to the inner end face of the pole body.

[0062] In the above technical solution, by laying the folding part on the inner end face of the pole body, the folding part is laid flat and at least part of the folding part falls on the inner end face of the pole body, so that the pole tab will not be damaged due to bending of the folding part, thus improving charging performance. It also facilitates the setting of the welding nozzle and improves the connection reliability between the folding part and the pole body.

[0063] In some embodiments, the housing component has a receiving cavity, and the pole component forms a receiving groove that is recessed relative to the first housing wall in a direction away from the electrode component and open in a direction towards the electrode component; the step of laying the gathering portion on the inner end face of the pole body further includes: inserting the gathering portion into the receiving groove.

[0064] In the above technical solution, by setting up a receiving groove to accommodate the gathering part, the space occupied by the tab in the receiving cavity can be reduced, so that the receiving cavity has a larger space to accommodate the active material coating part, which is conducive to increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell.

[0065] In some embodiments, the electrode component includes a plurality of electrode assemblies stacked together; prior to the step of laying the gathering portion on the inner end face of the electrode post body, the method further includes: placing the electrode post component on one side of the protruding electrode tab of the electrode component; adjusting the angle of the electrode post component so that the normal of the inner end face of the electrode post body is close to the stacking direction of the plurality of electrode assemblies.

[0066] In the above technical solution, by first adjusting the position and angle of the electrode post component so that the normal of the inner end face of the electrode post body is close to the stacking direction of multiple electrode components, and then laying the gathering part on the inner end face of the electrode post body, there is no need to adjust the angle of the electrode post body. This allows sufficient space near the mating position of the gathering part and the inner end face of the electrode post body for welding operations, thereby simplifying the operation.

[0067] In some embodiments, the electrode component includes an electrode body, and the electrode component is connected to the electrode body via a conductive portion. The conductive portion includes a tab portion composed of tabs of the electrode component and a conductive element connected to the tab portion. The tab portion is connected to the electrode body via the conductive element. The step of connecting the electrode component to the electrode component specifically includes connecting the tab portion to the conductive element.

[0068] In the above technical solution, by connecting the tab and the electrode body with a conductive component, the length of the tab can be shortened, and problems such as wrinkling, bending and breakage of the tab can be improved. Furthermore, by flexibly designing the shape and material of the conductive component, the connection difficulty with the electrode body can be reduced, and the connection convenience between the conductive component and the electrode body can be improved.

[0069] In some embodiments, the electrode component includes a plurality of electrode assemblies; prior to the step of connecting the tab to the conductive element, the method further includes: stacking a plurality of electrode assemblies along the thickness direction of the electrode assemblies; and stacking and aggregating multilayer tabs of at least two electrode assemblies to form a stacked portion.

[0070] In the above technical solution, before connecting the tabs to the conductive parts, multiple electrode assemblies are stacked first. Several tabs of the same polarity of multiple electrode assemblies are gathered together to form a stack. Compared with the technical solution of gathering the tabs of each electrode assembly separately to form a stack, connecting the stack of each electrode assembly to the conductive parts separately, and then stacking multiple electrode assemblies, this method can reduce the total number of stacks and conductive parts, reduce the connection steps between the stacks and conductive parts, and improve processing efficiency. On the other hand, it can avoid the problem of cracking at the connection position between the tabs and the active material coating part caused by the asynchronous movement of the tabs of different electrode assemblies when connecting the stacks and conductive parts first and then stacking the electrode assemblies.

[0071] In some embodiments, the tab portion of the electrode component includes a stacked portion formed by stacking and aggregating multiple tabs; prior to the step of connecting the tab portion to the conductive element, the method further includes connecting the multiple tabs in the stacked portion to form a gathered portion.

[0072] In the above technical solution, by pre-connecting multiple layers of tabs in the stacked part to form a gathered part, the gathered part can present a plate shape with multiple layers of tabs connected together and having a certain rigidity, rather than a loose and scattered multi-layer foil shape. This facilitates the connection between the tab and the conductive component, and makes the welding between the tab and the conductive component more reliable. It is not easy for pores to form in the weld, which can improve the connection reliability and conductivity of the weld, and make the conductivity between the electrode component and the pole component more stable and reliable.

[0073] In some embodiments, the conductive element includes a first connecting segment, and the step of connecting the tab to the conductive element specifically includes: stacking the folded portion on one side in the thickness direction of the first connecting segment; and connecting the folded portion to the first connecting segment.

[0074] In the above technical solution, by setting the first connecting section and the gathering part to be in the same thickness direction, and stacking and connecting them along the thickness direction of the first connecting section, the matching method between the gathering part and the conductive part is simple, which is conducive to improving production efficiency.

[0075] In some embodiments, the conductive element includes a first connecting segment, the first connecting segment including two clamping portions; the step of connecting the tab portion to the conductive element specifically includes: clamping the tab end of the tab portion between the two clamping portions; and connecting the tab end of the tab portion to the two clamping portions as a whole.

[0076] In the above technical solution, two clamping parts can be used to limit the position of the tabs, improving the connection reliability of the multi-layer tabs in the tabs. Furthermore, in some examples, by providing two clamping parts, the tabs clamped between the two clamping parts can be in a stacked state, eliminating the step of connecting the multi-layer tabs in the stacked part to form a closed section, thereby simplifying the processing steps and improving processing efficiency. Alternatively, the multi-layer tabs in the stacked part can be connected to form a closed section first, and then the closed section can be clamped between the two clamping parts and connected to them. This can reduce the porosity at the connection between the conductive component and the tabs, improving current carrying capacity and connection reliability.

[0077] In some embodiments, after the step of connecting the tab to the conductive element, the method further includes: adjusting the angle of the electrode post component so that the inner end face of the electrode post body faces the electrode component, and the first connecting segment of the conductive element is supported on the side of the tab away from the electrode post body.

[0078] In the above technical solution, the support of the tab by the first connecting section of the conductive component can improve the redundancy of the tab and reduce the risk of short circuit caused by the tab being inserted into the active material coating. Moreover, the bent conductive component can act as a buffer support, reducing the risk of the electrode components hitting the first shell wall and improving the reliability of the battery cell.

[0079] In some embodiments, the step of connecting the electrode component to the pole component further includes connecting the conductive element to the pole body.

[0080] In the above technical solution, by setting the conductive component and the electrode body as separate components and assembling them together, the conductive component and the electrode body can be flexibly designed and processed, thereby improving the diversity of battery cells.

[0081] In some embodiments, the electrode component includes an electrode body, and the surface of the electrode body facing the electrode component is the inner end face of the electrode body; the conductive element includes a second connecting segment, and the step of connecting the conductive element to the electrode body specifically includes: laying the second connecting segment on the inner end face of the electrode body; and connecting the second connecting segment to the inner end face of the electrode body.

[0082] In the above technical solution, by laying the second connecting segment of the conductive element on the inner end face of the electrode body, at least a portion of the second connecting segment falls on and connects with the inner end face of the electrode body, thereby increasing the connection area between the second connecting segment of the conductive element and the electrode body and improving charging performance. Furthermore, it facilitates the setting of the welding nozzle and improves the connection reliability between the second connecting segment of the conductive element and the electrode body.

[0083] In some embodiments, the electrode post component forms 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 towards the electrode component; the step of laying the second connecting segment on the inner end face of the electrode post body further includes: inserting the second connecting segment into the receiving groove.

[0084] In the above technical solution, by setting a receiving groove to accommodate the second connecting section, the space occupied by the conductive component in the receiving cavity can be reduced, allowing the receiving cavity to have a larger space to accommodate the active material coating part. This is beneficial for increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell. Moreover, since the receiving groove is open towards the electrode component, the second connecting section can be easily extended into the receiving groove, reducing the difficulty of operation.

[0085] In some embodiments, the electrode component includes a plurality of electrode assemblies stacked together; prior to the step of laying the second connecting segment on the inner end face of the electrode post body, the method further includes: placing the electrode post component on one side of the electrode post component extending from the tab; and adjusting the angle of the electrode post component so that the normal of the inner end face of the electrode post body is close to the stacking direction of the plurality of electrode assemblies.

[0086] In the above technical solution, by first adjusting the position and angle of the electrode component so that the normal of the inner end face of the electrode body is close to the stacking direction of multiple electrode components, and then laying the second connecting segment of the conductive component on the inner end face of the electrode body, there is no need to adjust the angle of the electrode body. This ensures that there is sufficient space near the mating position of the second connecting segment and the inner end face of the electrode body for welding operations, thereby simplifying the operation.

[0087] In some embodiments, the electrode component is connected to the electrode post body via a conductive portion. The conductive portion includes a tab portion composed of tabs of the electrode component and a conductive element connected to the tab portion. The position of the inner end face of the transition structure adjacent to the electrode post body is a surrounding region surrounding the electrode post body. The inner end face of the electrode post body protrudes out of the surrounding region in the direction facing the electrode component. The conductive element includes a first conductive segment laid on the inner end face of the electrode post body and a second conductive segment offset from the inner end face of the electrode post body. The second conductive segment protrudes relative to the first conductive segment in the direction away from the electrode component. The step of connecting the electrode component to the electrode post component further includes: shaping the conductive element to make the conductive element include the first conductive segment and the second conductive segment; and connecting the tab portion to the second conductive segment.

[0088] In the above technical solution, the arrangement of conductive components can make full use of space and meet the connection requirements with the electrode body and conductive parts, making the design of battery cells more diverse and flexible.

[0089] In some embodiments, the electrode component is connected to the electrode post body via a conductive portion. The conductive portion includes a tab portion composed of tabs of the electrode component and a conductive element connected to the tab portion. The position of the inner end face of the transition structure adjacent to the electrode post body is a surrounding region surrounding the electrode post body. The surrounding region protrudes from the inner end face of the electrode post body in the direction toward the electrode component. The inner end face of the electrode post body includes a mating region opposite to the annular hole of the surrounding region. The conductive element includes a first conductive segment laid in the mating region and a third conductive segment offset from the mating region. The third conductive segment protrudes from the first conductive segment in the direction toward the electrode component. The tab portion is connected to the third conductive segment. The step of connecting the electrode component to the electrode post component further includes: shaping the conductive element to include the first conductive segment and the third conductive segment; and connecting the tab portion to the third conductive segment.

[0090] In the above technical solution, the arrangement of conductive components can make full use of space and meet the connection requirements with the electrode body and conductive parts, making the design of battery cells more diverse and flexible.

[0091] In some embodiments, the electrode component includes an active material coating portion, which is connected to the electrode post component via a conductive portion. The conductive portion is bent to form at least two opening slots, and the openings of two adjacent opening slots have different orientations and are adjacent in the direction from the electrode post component to the active material coating portion. The step of installing the electrode post component connected to the electrode component to the first shell wall specifically includes: shaping the conductive portion to bend it to form at least two opening slots.

[0092] In the above technical solution, the conductive part can exhibit a serpentine, reciprocating bending shape. This conductive part acts as a buffer, reducing the impact of the active material coating on the first shell wall when the battery cell is used in a vibration environment, thus protecting the electrode components and improving the reliability of the battery cell. Furthermore, because the conductive part does not extend irregularly, it reduces interference and friction between the tabs within the conductive part, as well as the risk of the tabs being inserted backwards into the active material coating, further enhancing the reliability of the battery cell.

[0093] In some embodiments, the step of shaping the conductive portion to bend the conductive portion to form at least two opening grooves specifically includes: shaping the conductive portion to bend the conductive portion to form two opening grooves with openings facing opposite directions.

[0094] 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.

[0095] In some embodiments, the battery cell includes a shaping bracket disposed on the side of the electrode component near the terminal post component. The shaping bracket has a perforation. In a state where the conductive part passes through the perforation, the active material coating part connected to the conductive part is located inside the shaping bracket, and the terminal post component connected to the conductive part is located outside the first shell wall, the step of shaping the conductive part to bend the conductive part to form two opening grooves with opposite opening directions specifically includes: with the action of covering the terminal post component in the direction of the first shell wall, the conductive part forms two opening grooves with opposite opening directions on the inside and outside of the shaping bracket.

[0096] In the above technical solution, by setting a shaping bracket, it is easy to bend the conductive part into two opening grooves with opposite opening directions, thus reducing the processing difficulty.

[0097] Secondly, embodiments of this application also provide a battery cell manufactured using the above-described assembly method.

[0098] In the above technical solution, since the battery cell according to the embodiment of this application is processed by the above assembly method, the reliability of the battery cell is improved.

[0099] In some embodiments, the shell body is a semi-closed cylindrical shape with 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 a flat plate shape and serves as the first shell wall.

[0100] In the above technical solutions, the shell components have various shapes and can adapt to a variety of application scenarios.

[0101] In some embodiments, the battery cell further includes a pressure relief device located on the housing component and on the same side or opposite side as the terminal component.

[0102] In the above technical solutions, when the pressure relief device and the terminal post are located on the same side, the design of other shell walls besides the first shell wall can be simplified, thus simplifying the structure and processing of the battery cell. When the pressure relief device and the terminal post are located on opposite sides, there is no need to consider the space occupied by the pressure relief device in the first shell wall, thereby reducing the volume of the terminal post. This allows for flexible design of the shape and volume of the terminal post as needed.

[0103] Thirdly, embodiments of this application also provide a battery, including a battery cell of any of the above-described solutions.

[0104] In the above technical solution, the reliability of the battery cell according to the embodiment of this application is improved, which is beneficial to improving the performance of the battery.

[0105] In some embodiments, the battery includes a housing, multiple battery cells are housed in the housing, the bottom of the housing is a housing bottom plate, and the terminal post is located on the side of the housing component facing the housing bottom plate, or on the side of the housing component away from the housing bottom plate.

[0106] In the above technical solution, when the terminal component of the battery cell is located on the side of the housing component facing the bottom plate of the box, the battery cell is in an inverted state, and the depressurized products are ejected in the direction away from the passenger compartment, which is safer; when the terminal component of the battery cell is located on the side of the housing component close to the bottom plate of the box, the battery cell is in an upright state, and the electrolyte is not easy to leak; therefore, the flexible setting of the battery cell and the box orientation can be realized.

[0107] Fourthly, embodiments of this application also provide an electrical device including a battery from any of the above-described solutions.

[0108] In the above technical solution, the improved battery performance is beneficial to enhancing the power consumption performance of the electrical device. Attached Figure Description

[0109] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0110] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0111] Figure 2 is an exploded view of a battery provided in some embodiments of this application;

[0112] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0113] Figure 4 is an exploded view of a portion of the battery cell provided in some embodiments of this application;

[0114] Figure 5 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0115] Figure 6 is a magnified view of a portion of Figure 5;

[0116] Figure 7 is an exploded view of a battery cell provided in some embodiments of this application;

[0117] Figure 8 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0118] Figure 9 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0119] Figures 10A-10D are exploded views of the assembly process of a battery cell provided in one embodiment of this application;

[0120] Figures 11A-11D are exploded views of the assembly process of a battery cell according to an embodiment of this application;

[0121] Figures 12A-12E are exploded views of the assembly process of a battery cell provided in one embodiment of this application;

[0122] Figures 13A-13E are exploded views of the assembly process of a battery cell provided in one embodiment of this application;

[0123] Figure 14 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0124] Figure 15 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0125] Figure 16 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0126] Figure 17 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0127] Figures 18A-18G are exploded views of the assembly process of a battery cell provided in one embodiment of this application;

[0128] Figure 19 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0129] Figure 20 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0130] Figure 21 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0131] Figure 22 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0132] Figures 23A-23D are exploded views of the assembly process of a battery cell according to an embodiment of this application;

[0133] Figures 24A-24D are exploded views of the assembly process of a battery cell provided in one embodiment of this application;

[0134] Figure 25 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0135] Figure 26 is a schematic diagram of the assembly of mounting holes and pole post components provided in some embodiments of this application;

[0136] Figure 27 is a schematic diagram of the assembly of mounting holes and pole post components provided in some other embodiments of this application;

[0137] Figure 28 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0138] Figure 29 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0139] Figures 30A-30D are exploded views of the assembly process of a battery cell provided in one embodiment of this application;

[0140] Figures 31A-31D are exploded views of the assembly process of a battery cell provided in one embodiment of this application;

[0141] Figure 32 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0142] Figure 33 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0143] Figures 34A-34D are exploded views of the assembly process of a battery cell provided in one embodiment of this application;

[0144] Figure 35 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0145] Figures 36A-36D are exploded views of the assembly process of a battery cell provided in one embodiment of this application;

[0146] Figure 37 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0147] Figure 38 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0148] Figure 39 is a top view of a battery cell provided in some embodiments of this application;

[0149] Figure 40 is a cross-sectional view along line AA in Figure 39;

[0150] Figure 41 is a schematic diagram of the pole post component provided in some embodiments of this application;

[0151] Figure 42 is a top view of the pole post component shown in Figure 41;

[0152] Figure 43 is a view along direction B shown in Figure 42;

[0153] Figure 44 is a cross-sectional view along line CC in Figure 42;

[0154] Figure 45 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0155] Figure 46 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0156] Figure 47 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0157] Figure 48 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0158] Figure 49 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0159] Figure 50 is an exploded view of the manufacturing process of the third adapter ring provided in some embodiments of this application;

[0160] Figure 51 is an exploded view of the processing of the pole post component provided in some embodiments of this application;

[0161] Figure 52 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0162] Figure 53 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0163] Figure 54 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0164] Figure 55 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0165] Figure 56 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0166] Figure 57 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0167] Figure 58 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0168] Figure 59 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0169] Figures 60A-60D are exploded views of the assembly process of a battery cell provided in one embodiment of this application;

[0170] Figure 61 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0171] Figure 62 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0172] Figure 63 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0173] Figures 64A-64D are exploded views of the assembly process of a battery cell provided in one embodiment of this application;

[0174] Figure 65 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0175] Figures 66A-66C are exploded views of the manufacturing process of an electrode component provided in one embodiment of this application;

[0176] Figure 67 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0177] Figure 68 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0178] Figure 69 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0179] Figure 70 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0180] Figure 71 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0181] Figure 72 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0182] Figure 73 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0183] Figure 74 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0184] Figure 75 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0185] Figure 76 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0186] Figure 77 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0187] Figure 78 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0188] Figure 79 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0189] Figure 80 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0190] Figure 81 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0191] Figure 82 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0192] Figure 83 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0193] Figure 84 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0194] Figure 85 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application;

[0195] Figure 86 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application.

[0196] Reference numerals: Vehicle 1000; Battery 100; Controller 200; Motor 300; Housing 101; First housing section 1011; Second housing section 1012; Battery cell 102; First direction F1; Second direction F2; Third direction F3; Fifth direction F4; Fifth direction F5; Housing component 1; Housing body 11; First housing wall 111; First recess 1111; Overlapping part 1112; Mounting hole 112; Opening 113; Second housing wall 114; Housing cover 12; Insulating bracket 121; Receiving cavity 13; Sealing ring 14; Terminal component 2; Terminal body 21; Inner end face 211; Through part 214; Riveting part 2141; Inner limiting part 215; Outer limiting part 216; First terminal component 21a; Second terminal component 21b; Mating hole 21b1; Adapter structure 22; Inner ring 2211 of the adapter structure; outer ring 2212 of the adapter structure; inner end face 220 of the adapter structure; surrounding area 2201; flange portion 22a; second recess 22b; first adapter ring 221; second adapter ring 222; stop ring portion 2221; first insulating frame 224; third adapter ring 223; inner extension portion 2231; outer extension portion 2232; second insulating frame 225; fourth adapter ring 227; mating ring portion 2271; third insulating frame 228; insulating structure 23; sealing structure component 231; axial side portion 231a; first insulating component 232; second insulating component 234; insulating sealing component 24; electrode component 3; electrode assembly 31; tab 311; stacked portion 312; gathering portion 313; active material coating portion 32; tab portion 33; tab end 331; Conductive part 4; conductive component 41; opening groove 42; first opening groove 421; second opening groove 422; first connecting section 411; clamping part 4110; second connecting section 412; first conductive section 415; second conductive section 416; third conductive section 417; receiving groove 5; pressure relief device 6; insulating film 7; binding member 8; shaping bracket 9; perforation 91. Detailed Implementation

[0197] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0198] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0199] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0200] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0201] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0202] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0203] In this application, "multiple" means two or more, including two.

[0204] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, or solid-state batteries, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0205] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. Exemplarily, a battery may include a housing for encapsulating one or more battery cells, or one or more battery modules, the housing preventing liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0206] A single battery cell includes a casing, electrode components, and an electrolyte (which may be a solid electrolyte layer located between the positive and negative electrodes in a solid-state battery). The electrode components include at least one electrode assembly, and both the electrode assembly and the electrolyte are housed within the casing. The electrode assembly includes a positive electrode, a negative electrode, and a separator (this structure can be omitted in solid-state batteries). The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0207] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0208] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP, polypropylene, PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of this application has a wound or stacked structure.

[0209] In some related technologies, the battery cell housing includes a body and a cover. The cover is pre-installed with terminals. When assembling the battery cell, the electrode assembly and the cover with the pre-installed terminals are first laid flat, with the electrode assembly positioned on one side of the cover in the width direction. Then, the tabs of the electrode assembly are overlapped on the pre-installed terminals on the cover, and the tabs are welded to the terminals. After that, the electrode assembly is flipped to one side of the cover in the thickness direction. Then, the body is fitted over the electrode assembly, and the body is welded to the cover.

[0210] In the aforementioned assembly process, the electrode assembly needs to be flipped from one side of the cover's width direction to the other side of the cover's thickness direction. This necessitates a relatively long tab (e.g., at least half the width of the cover) to meet the flipping requirements. However, due to the long tab length, there is significant redundancy within the housing after assembly. This not only occupies considerable space within the housing, affecting the energy density of the individual battery cells, but also poses a risk of short circuits caused by the tab being inserted backwards into the electrode assembly, impacting the reliability of the individual battery cells. Furthermore, this assembly method is only suitable for designs where the terminals are pre-mounted on the cover. If the terminals are pre-mounted on the housing body, installation is not possible. Specifically, if the terminals are pre-mounted on the housing body, after the electrode assembly is installed inside the housing body, there is no space for the welding fixture to extend into the housing body. Welding the tab to the pre-mounted terminal from the inside of the housing body is impossible. If the welding fixture is placed on the outside of the housing body, the terminal's thickness completely obscures the outside of the tab, making reliable welding between the terminal and the tab impossible from the outside.

[0211] In view of this, embodiments of this application propose an assembly method for a single battery cell. Instead of pre-assembling the terminal post and the electrode component first, the method connects the terminal post and the housing component, and then connects the terminal post and the housing component. This shortens the length of the conductive portion connecting the terminal post and the electrode component, reduces redundancy of the conductive portion within the housing component, and reduces the space occupied by the conductive portion within the housing component. This improves the energy density of the single battery cell and reduces the risk of short circuits caused by the conductive portion being inserted backwards into the active material coating of the electrode component, thus improving the reliability of the single battery cell. Furthermore, this assembly method can assemble the single battery cell whether the terminal post is placed on the housing body or the housing cover, allowing for flexible selection of the terminal post installation position on the housing component. When the terminal post is placed on the housing body, it helps reduce cracking at the connection between the housing body and the housing cover, improving the reliability of the single battery cell.

[0212] The technical solutions described in the embodiments of this application are applicable to battery cells, batteries containing battery cells, and electrical devices using batteries.

[0213] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0214] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0215] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 is equipped with a battery 100, which can be located at 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 serve as the operating power source for the vehicle 1000.

[0216] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0217] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0218] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a battery cell 102 and a housing 101 for housing the battery cell 102. The housing 101 can have various structural forms.

[0219] In some embodiments, the housing 101 may include a first housing portion 1011 and a second housing portion 1012, which overlap each other, and together define a receiving space for accommodating the battery cell 102. A sealing element may also be provided at the connection point between the first housing portion 1011 and the second housing portion 1012 to achieve a sealed connection. For example, referring to FIG2, the first housing portion 1011 and the second housing portion 1012 may both be hollow structures with an opening on one side, with the opening side of the first housing portion 1011 covering the opening side of the second housing portion 1012, thus forming a housing 101 with a receiving space. As another example, the second housing portion 1012 may be a hollow structure with an opening on one side, and the first housing portion 1011 may be a cover that covers the opening side of the second housing portion 1012. Box 101 can be in various shapes, such as cylindrical box, cuboid box, etc.

[0220] In battery 100, there can be one or more battery cells 102. If there are multiple battery cells 102, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 102 are connected in both series and parallel configurations. Multiple battery cells 102 can be directly connected in series, in parallel, or in a mixed configuration, and then the whole assembly of multiple battery cells 102 is housed in housing 101. Alternatively, multiple battery cells 102 can first be connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed configuration to form a whole assembly, which is then housed in housing 101. In some embodiments, multiple battery cells 102 can be electrically connected through a busbar component to achieve parallel, series, or mixed configurations of multiple battery cells 102.

[0221] Please refer to Figure 3, which is a schematic diagram of the structure of a battery cell 102 provided in some embodiments of this application. The battery cell 102 is in the form of a cuboid. 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, and the width direction of the battery cell 102 is the third direction F3. The first direction F1, the second direction F2, and the third direction F3 are all perpendicular to each other.

[0222] Please refer to Figures 4-8. Figure 4 is an exploded view of a portion of the battery cell provided in some embodiments of this application; Figure 5 is a cross-sectional view of a battery cell provided in some embodiments of this application; Figure 6 is a partial enlarged view of Figure 5; Figure 7 is an exploded view of a battery cell provided in some embodiments of this application; and Figure 8 is a cross-sectional view of a battery cell provided in some embodiments of this application.

[0223] Referring to Figures 4-6, the battery cell 102 may include a housing component 1, a terminal component 2, and an electrode component 3.

[0224] Referring to Figures 4-6, the terminal post 2 is mounted on the housing component 1. Exemplarily, the housing component 1 has a receiving cavity 13. The housing component 1 includes a first housing wall 111, which helps to form the receiving cavity 13. The first housing wall 111 has a mounting hole 112. The terminal post 2 is mounted on the first housing wall 111 and is located at the mounting hole 112. Here, "the terminal post 2 is mounted on the first housing wall 111" means that the terminal post 2 and the first housing wall 111 have an assembly connection relationship, such as welding or riveting. Therefore, the housing component 1 and the terminal post 2 are separate components, assembled together. This allows for the separate processing of the housing component 1 and the terminal post 2, facilitating their processing and the manufacturing of the battery cell 102.

[0225] Referring to Figures 4-6, the electrode component 3 is housed within the housing component 1. Exemplarily, the electrode component 3 includes an active material coating portion 32 and a tab portion 33. The active material coating portion 32 is housed within the receiving cavity 13, and the tab portion 33 is connected to the active material coating portion 32. The electrode component 3 includes one or more electrode assemblies 31. The portion of the electrode assembly 31 coated with an active material layer forms the active material coating portion 32, and the portion without an active material layer forms the tab portion 33. The tab portion 33 includes multiple layers of tab sheets 311.

[0226] The electrode post 2 and the first housing wall 111 are located on the same side of the electrode post 3, that is, the electrode post 2 is located on the side where the first housing wall 111 is located, so that the electrode post 2 can be installed in the mounting hole 112 of the first housing wall 111. For example, when the first housing wall 111 is above the electrode post 3, the electrode post 2 is also above the electrode post 3; when the first housing wall 111 is below the electrode post 3, the electrode post 2 is also below the electrode post 3; when the first housing wall 111 is on the side of the electrode post 3, the electrode post 2 is also on the same side of the electrode post 3.

[0227] For example, the housing component 1 can be surrounded by multiple walls facing different directions, one of which is a first housing wall 111. The projection plane perpendicular to the through direction of the mounting hole 112 is used as the projection plane. The orthographic projection of the mounting hole 112 on this projection plane falls entirely within the range of the orthographic projection of the first housing wall 111 on the same 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 can be provided on the first housing wall 111 to meet the installation requirements of one or more pole post components 2.

[0228] Referring to Figures 5-8, electrode component 3 is connected to terminal component 2. Electrode component 3 is connected to terminal component 2 via conductive portion 4. Terminal component 2 includes terminal body 21, and active material coating portion 32 is connected to terminal body 21 via conductive portion 4, forming electrical conductivity. Exemplarily, battery 100 includes a current-collecting component located outside battery cell 102, and terminal body 21 is connected to the current-collecting component to form electrical conductivity, thereby allowing multiple battery cells 102 to be connected via the current-collecting component.

[0229] For example, when the electrode post 2 is the negative electrode, the electrode post body 21 can be a copper-aluminum composite component, wherein the copper-aluminum composite component can include an aluminum part and a copper part. The aluminum part is located on the side of the copper part away from the active material coating part 32, and can easily form a reliable connection with the aluminum busbar component. The copper part can easily connect with the copper foil tab 311 of the negative electrode. When the electrode post 2 is the positive electrode, the electrode post body 21 can be an aluminum component. The aluminum component can easily form a reliable connection with the aluminum busbar component, and the aluminum component can also easily connect with the aluminum foil tab 311 of the positive electrode.

[0230] The connection method between the conductive part 4 and the electrode component 2 is not limited, and may include, but is not limited to, ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure welding, brazing, bonding, etc.

[0231] For example, referring to Figure 6, the conductive part 4 may include both a tab 33 and a conductive element 41 connected to the tab 33. The tab 33 is indirectly connected to the electrode body 21 through the conductive element 41. The conductive element 41 may be part of the electrode component 3, or it may be part of the electrode component 2, or it may be independent of both the electrode component 3 and the electrode component 2.

[0232] Therefore, by indirectly connecting the tab 33 and the pole body 21 through the conductive element 41, the length of the tab 33 can be shortened, and problems such as wrinkling, bending and breakage of the tab 311 can be improved. Furthermore, by flexibly designing the shape and material of the conductive element 41, the connection difficulty with the pole body 21 can be reduced, and the connection convenience between the conductive element 41 and the pole body 21 can be improved.

[0233] For example, referring to Figure 8, the conductive part 4 includes a tab 33, and is connected to the electrode body 21 through the tab 33. That is, the conductive element 41 is not required, and the tab 33 can be directly connected to the electrode body 21. Thus, the use of the conductive element 41 can be eliminated, and the connection process between the conductive element 41 and the tab 33 can be eliminated.

[0234] An insulating material is provided between the pole body 21 and the first housing wall 111 to achieve insulation between the first housing wall 111 and the pole body 21, thereby preventing the first housing wall 111 from becoming charged. For example, the insulating material can be a part of the pole component 2 (e.g., insulating structure 23) and is insulated from the pole body 21.

[0235] The structure of housing component 1 is not limited. For example, referring to Figure 4, housing component 1 includes a shell body 11 that helps to form the receiving 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 adjacent to the opening 113 (such as a second shell wall 114) is the first shell wall 111. As another example, referring to Figure 7, housing component 1 includes a shell cover 12 that helps to form the receiving cavity 13. The shell cover 12 is the first shell wall 111. Thus, the structural design of housing component 1 is flexible, and the placement of pole component 2 is flexible.

[0236] When the end of the shell 11 opposite to the opening 113 is the first shell wall 111, for example, referring to Figures 4 and 5, the shell component 1 may include a shell 11 and a shell cover 12. One end of the shell 11 has an opening 113, and the shell cover 12 covers the opening 113. The shell 11 and the shell cover 12 together form a receiving cavity 13, and the end of the shell 11 opposite to the opening 113 serves as the first shell wall 111. Alternatively, for example, the shell component 1 may include two shells 11, each shell 11 having an opening 113 at one end. The openings 113 of the two shells 11 are opposite to each other and cover each other. The two shells 11 together form a receiving cavity 13, and the end of one shell 11 opposite to the opening 113 serves as the first shell wall 111.

[0237] When the cover 12 is the first shell wall 111, for example, referring to Figures 7 and 8, the shell component 1 may include a shell body 11 and a cover 12. One end of the shell body 11 has an opening 113, and the cover 12 is closed on the opening 113. The shell body 11 and the cover 12 together form a receiving cavity 13, and the cover 12 serves as the first shell wall 111. Alternatively, for example, the shell component 1 may include a shell body 11 and two covers 12. Both ends of the shell body 11 have openings 113, and each opening 113 is covered by a cover 12. The two covers 12 and the shell body 11 together form a receiving cavity 13, and one of the covers 12 serves as the first shell wall 111.

[0238] In some embodiments of this application, referring to Figures 4 and 5, the housing component 1 includes a shell body 11 that participates in forming a receiving 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 is understood that the shell body 11 is a single piece, that is, the shell body 11 is a single molded 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 opposite to 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, the cavity constituting at least a portion of the receiving cavity 13.

[0239] When the housing component 1 includes a shell body 11 with an opening 113 at one end, the housing component 1 also includes a shell body fitting structure. The shell body fitting structure fits with the shell body 11 to cover the opening 113 and together with the shell body 11, forms a receiving cavity 13. For example, the shell body 11 is semi-closed cylindrical, and the shell body fitting structure is flat, that is, the shell body fitting structure can be a shell cover 12. In this case, the housing component 1 can be a combination of the shell body 11 and the shell cover 12. Another example is that the shell body 11 is semi-closed cylindrical, and the shell body fitting structure can be semi-closed cylindrical, that is, the shell body fitting structure can be the other half of the shell body 11. In this case, the housing component 1 can be a combination of two shell bodies 11, etc. Yet another example is that the shell body fitting structure can be a shell assembly, which is assembled from multiple parts. Thus, the housing component has various forms and can adapt to various application scenarios.

[0240] In the above technical solution, since the electrode component 3 housed in the housing component 1 is connected to the terminal component 2 installed on the first housing wall 111, when the battery 100 vibrates or deforms, the terminal components 2 connected by the busbar component will pull on each other. Since the terminal component 2 is set on the end wall opposite to the opening 113 of the housing body 11, the force on the terminal component 2 will be preferentially transmitted to the housing body 11, and will not directly act on the housing body mating structure (e.g., the housing cover 12). This not only extends the distance of force transmission to the connection between the housing body 11 and the housing body mating structure (e.g., the housing cover 12), but also causes the housing body 11 to deform preferentially when subjected to force, thereby reducing the force on the connection between the housing body 11 and the housing body mating structure (e.g., the housing cover 12). This can effectively reduce the probability of cracking at the connection between the housing body 11 and the housing body mating structure (e.g., the housing cover 12) during the use of the battery 100, and improve the reliability of the battery cell 102. Furthermore, since the connection between the casing 11 and the casing mating structure (e.g., the cover 12) is less prone to cracking, there is no need to increase the wall thickness of either component to improve the reliability of the connection. This helps reduce weight and material costs, and facilitates the miniaturization of the battery cell 102 or increases its energy density. The connection method between the casing 11 and the casing mating structure is not limited; for example, it can be bonding, welding, etc.

[0241] The material of the housing component 1 is not limited, including but not limited to aluminum shell, steel shell, aluminum-plastic film, plastic or other materials resistant to electrolyte corrosion.

[0242] The following describes a method for assembling a battery cell 102 according to some embodiments of the present invention.

[0243] Please refer to Figure 9, which is a flowchart of the assembly method of a battery cell according to some embodiments of this application. In some embodiments of this application, the assembly method of the battery cell 102 may include the following steps.

[0244] Step S20: Connect electrode component 3 to pole component 2.

[0245] For example, the electrode component 3 includes a tab 33 and the electrode post component 2 includes an electrode post body 21. The "step S20, connecting the electrode component 3 and the electrode post component 2" can specifically be: "directly or indirectly connecting the tab 33 and the electrode post body 21" to achieve electrical conduction between the electrode component 3 and the electrode post component 2.

[0246] Please refer to Figures 10A-10D, which are exploded views of the assembly process of a battery cell according to an embodiment of this application. Exemplarily, the tab 33 is directly connected to the terminal body 21. For example, the tab 33 and the terminal body 21 can be directly connected by welding (such as laser welding, resistance welding, pressure welding, or brazing), drilling, bonding, etc.

[0247] Please refer to Figures 12A-12E and 13A-13E. Figures 12A-12E are exploded views of the assembly process of a battery cell according to an embodiment of this application; Figures 13A-13E are exploded views of the assembly process of a battery cell according to an embodiment of this application. Exemplarily, the tab 33 can be indirectly connected to the terminal body 21 via the conductive element 41. In this case, "step S20, connecting the electrode component 3 to the terminal component 2" may include at least one of the steps of "connecting the conductive element 41 to the tab 33" and "connecting the conductive element 41 to the terminal body 21". For example, the conductive element 41 and the tab 33 can be directly connected by welding (such as laser welding, resistance welding, pressure welding, or brazing), drilling, or bonding. For example, the conductive element 41 and the terminal body 21 can be directly connected by welding (such as laser welding, resistance welding, pressure welding, or brazing), drilling, or bonding.

[0248] Step S30: Install the pole post component 2, which is connected to the electrode component 3, onto the first shell wall 111.

[0249] The electrode component 2 can take many forms. It can be a whole, inseparable material, or it can be a multi-part assembly. Therefore, "step S30, install the electrode component 2 connected to the electrode component 3 to the first shell wall 111" can be interpreted in a broad sense, that is, simply assemble the part of the electrode component 2 that connects to the electrode component 3 to the first shell wall 111.

[0250] Please refer again to Figures 10A-10D, 12A-12E, and 13A-13E. For example, when the electrode component 2 does not need to be assembled, "Step S20: Connect the electrode component 3 to the electrode component 2; Step S30: Install the electrode component 2 connected to the electrode component 3 to the first housing wall 111" can be specifically described as: "First connect the electrode component 2 to the electrode component 3, and then install the electrode component 2 to the first housing wall 111 (for example, cover the mounting hole 112 on the first housing wall 111 with the electrode component 3, and then connect the electrode component 2 to the first housing wall 111 by welding, riveting, or bonding, etc.)".

[0251] Please refer to Figures 0103A-0103D. Figures 013A-0103D are exploded views of the assembly process of a battery cell provided in one embodiment of this application. Alternatively, by way of example, when the terminal post component 2 needs to be assembled, "step S20, connect the electrode component 3 to the terminal post component 2; step S30, install the terminal post 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 terminal post component 2 (e.g., the first terminal post 21a) to the electrode component 3, and the connection of the remaining part of the terminal post component 2 (e.g., the second terminal post 21b) to the first shell wall 111, and then combine and connect the above two parts of the terminal post component 2 (e.g., the first terminal post 21a and the second terminal post 21b).

[0252] In the above technical solution, since the connection between electrode component 3 and terminal component 2 is completed first, and then the assembly connection between terminal component 2 and housing component 1 is completed, instead of pre-assembling the terminal component and housing component first and then connecting the electrode component and terminal component, this is beneficial to shortening the length of the conductive part 4 connecting terminal component 2 and electrode component 3, reducing the redundancy of conductive part 4 in housing component 1, reducing the space occupied by conductive part 4 in housing component 1, which is beneficial to improving the energy density of battery cell 102. Moreover, it is beneficial to reduce the risk of short circuit caused by the conductive part 4 being inserted backward into the active material coating part 32 of electrode component 3, thus improving the reliability of battery cell 102. In addition, this assembly method can achieve the assembly of battery cell 102 whether terminal component 2 is placed on housing body 11 or housing cover 12, so the installation position of terminal component 2 can be flexibly selected on housing component 1. Among them, when terminal component 2 is placed on housing body 11, it is beneficial to reduce the cracking problem at the connection between housing body 11 and housing cover 12, thus improving the reliability of battery cell 102.

[0253] For example, referring to Figures 4 and 5, when the housing component 1 includes a housing body 11 and a housing cover 12, the housing body 11 has an opening 113, the housing cover 12 closes to the opening 113, the end wall of the housing body 11 opposite to the opening 113 serves as a first housing wall 111, and the first housing wall 111 has a mounting hole 112, and the electrode post component 2 is installed at the mounting hole 112 of the first housing wall 111. If the electrode post component 2 is installed at the mounting hole 112 of the first housing wall 111 first, and then the electrode component 3 is installed into the housing body 11, it is difficult to connect the electrode component 3 and the electrode post component 2. However, in the embodiments of this application, by first connecting the electrode component 3 and the electrode post component 2, and then connecting the electrode post component 2 and the housing component 1, the connection requirements of the electrode component 3 and the electrode post component 2, as well as the connection requirements of the electrode post component 2 and the housing component 1, can be satisfied.

[0254] When the battery 100 vibrates or deforms, the terminal components 2 connected by the busbar will pull against each other. Since the terminal components 2 are located on the first shell wall 111 opposite the shell body 11 and the opening 113, the force on the terminal components 2 will be preferentially transmitted to the shell body 11 instead of directly acting on the shell cover 12. This not only extends the distance the force is transmitted to the connection point (such as the weld) between the shell body 11 and the shell cover 12, but also causes the shell body 11 to deform preferentially under stress, reducing the stress on the connection point (such as the weld). This effectively reduces the probability of cracking at the connection point (such as the weld) between the shell cover 12 and the shell body 11 during battery use, improving the reliability of the battery cell 102. Furthermore, since the connection point (such as the weld) between the shell body 11 and the shell cover 12 is less prone to cracking, there is no need to increase the wall thickness of the two components to increase the reliability of the connection, which helps to reduce weight and material costs.

[0255] For example, referring to Figure 7, when the housing component 1 includes a housing body 11 and a housing cover 12, the housing body 11 has an opening 113, the housing cover 12 closes to the opening 113, the housing cover 12 serves as a first housing wall 111, the first housing wall 111 has a mounting hole 112, and the electrode component 2 is installed at the mounting hole 112 of the first housing wall 111. If the electrode component 2 is installed on the housing cover 12 first, and then the electrode component 2 is connected to the electrode component 3, then when connecting the electrode component 2 and the electrode component 3, the length of the conductive part 4 needs to be set to be relatively long (for example, greater than half the width of the housing cover 12), so that the electrode component 3 can be located on one side in the width direction of the housing cover 12. In this way, the length of the conductive part 4 is relatively long, and after assembly, the conductive part 4 has more redundancy, which easily leads to the risk of inverted insertion into the active material coating part 32 and causing a short circuit. In the embodiments of this application, by first connecting the terminal post 2 and the electrode 3, and then installing the terminal post 2 on the housing 12, the length of the conductive part 4 is such that the electrode 3 can be located on one side of the width direction of the terminal post 2 when connecting the terminal post 2 and the electrode 3. This shortens the length of the conductive part 4 (for example, greater than half the width of the terminal post 2), reduces the redundancy of the conductive part 4 after assembly, reduces the risk of the conductive part 4 being inserted into the active material coating part 32 and causing a short circuit, improves the reliability of the battery cell 102, and can also reduce the material and cost of the conductive part 4.

[0256] In summary, the assembly method of the battery cell 102 according to the embodiments of this application allows for unrestricted assembly position of the terminal component 2 on the housing component 1. The terminal component 2 can be mounted on either the housing body 11 or the housing cover 12, enabling flexible selection of its installation position on the housing component 1. This facilitates meeting the production needs of different types of battery cells 102. Specifically, when the terminal component 2 is mounted on the housing body 11, it helps to mitigate cracking issues at the connection between the housing body 11 and the housing cover 12, improving the reliability of the battery cell 102. Conversely, when the terminal component 2 is mounted on the housing cover 12, it helps to shorten the length of the conductive portion 4, reducing redundancy after assembly, lowering the risk of reverse insertion, and further improving the reliability of the battery cell 102.

[0257] In some embodiments of this application, referring to Figures 4 and 7, the electrode component 2 includes an electrode body 21, a connecting structure 22, and an insulating structure 23. The electrode component 3 is connected to the electrode body 21. The connecting structure 22 surrounds the electrode body 21 and is connected to the first shell wall 111. The insulating structure 23 is insulated between the connecting structure 22 and the electrode body 21. The connecting structure 22 surrounds the entire circumference of the electrode body 21 along the mounting hole 112, thereby connecting the electrode body 21 and the first shell wall 111 in the outer peripheral area of ​​the electrode body 21. The insulating structure 23 insulates the mating position between the connecting structure 22 and the electrode body 21, preventing short circuits between the electrode body 21 and the connecting structure 22. The connection method between the connecting structure 22 and the first shell wall 111 is not limited; for example, it can be welded, riveted, drilled, or glued.

[0258] Please refer to Figure 14, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application, and again refer to Figures 10A-10D, 12A-12E, and 13A-13E; in some embodiments of this application, when the electrode component 2 includes the above-mentioned electrode body 21, adapter structure 22 and insulation structure 23, "step S20, connecting the electrode component 3 to the electrode component 2" may specifically include: "step S20a, connecting the electrode component 3 to the electrode body 21"; "step S30, installing the electrode component 2 connected to the electrode component 3 to the first shell wall 111" may specifically include: "step S30a, setting the electrode 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".

[0259] In the above technical solution, the pole piece 2 has a simple structure and is easy to process. Since it includes two parts, the pole piece body 21 and the adapter structure 22, the shape and size of the pole piece body 21 and the adapter structure 22 can be designed separately based on different factors to flexibly adapt to the connection requirements of different types of housing parts 1 and electrode parts 3, thereby increasing the applicability of the pole piece 2.

[0260] Please refer to Figure 15, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application, and again refer to Figures 10A-10D; for example, "step S20a, connecting the electrode component 3 to the electrode post 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 extending 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 extending to the outer side of the first shell wall 111 to the electrode post body 21 of the electrode post component 2 placed on the outer side of the first shell wall 111".

[0261] Here, "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; "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. Therefore, since the conductive part 4 is not yet connected to the electrode post component 2 when it passes through the mounting hole 112, it is convenient for the conductive part 4 to pass through the mounting hole 112, improving operational convenience. Furthermore, since the welding position between the electrode post component 2 and the conductive part 4 is located on the outer side of the first shell wall 111, the problem of conductive debris formed during welding entering the interior of the shell 11 and damaging the electrode component 3 can be mitigated.

[0262] For example, the mounting hole 112 is an elongated hole (e.g., rectangular, elliptical, racetrack-shaped, etc.). 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. In this case, the thickness direction of this portion of the conductive part 4 can be adjusted to match the width direction of the mounting hole 112, and the length direction of this portion of the conductive part 4 can be at an angle to the length direction of the mounting hole 112. This allows the portion of the conductive part 4 to pass smoothly through the mounting hole 112, improving assembly efficiency and reducing the risk of collision and scratches between the conductive part 4 and the housing component 1. However, this application is not limited to this. 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 circles, polygons, etc. "Racetrack-shaped" refers to an elongated oval, which can be generally considered to be composed of a rectangle and two semicircles. The outline shape of the elongated oval 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.

[0263] Further, please refer to Figure 16, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. Referring again to Figures 10A-10D, "Step S30a, setting the electrode post 2 connected to the electrode post 3 at the mounting hole 112, and connecting the adapter structure 22 to the first shell wall 111" may specifically include: "Step S311, covering the mounting hole 112 from the outside of the first shell wall 111 with the electrode post 2 connected to the conductive part 4, so that the adapter structure 22 abuts against the outside of the first shell wall 111"; "Step S312, connecting the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111". Here, the adapter structure 22 abutting against the outside of the first shell wall 111 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.

[0264] Therefore, since the pole piece 2 is installed on the mounting hole 112 from the outside of the first housing wall 111, the adapter structure 22 abuts against the outside of the first housing wall 111, and the adapter structure 22 is connected to the first housing wall 111 from the outside of the first housing wall 111, so as to facilitate the assembly and connection of the pole piece 2 and the first housing wall 111, which helps to improve the connection reliability of the pole piece 2 and the first housing wall 111.

[0265] For example, referring to Figures 10A-10D, when assembling the battery cell 102, the multi-layered tabs 311 in the tab portion 33 can be connected to form a gathered portion 313. 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. The gathered portion 313 is then connected to the electrode post component 2 placed on the outside of the first shell wall 111. Next, the electrode post component 2 with the gathered portion 313 is placed on the mounting hole 112 from the outside of the first shell wall 111. Finally, 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 scenarios where the shell cover 12 serves as the first shell wall 111 and scenarios where the shell body 11 includes the first shell wall 111.

[0266] For example, please refer to FIG17, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. Referring again to FIG10A-FIG10D, when the end of the housing 11 opposite to the opening 113 is the first housing 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 housing wall 111, and passing the conductive part 4 through the mounting hole 112 to the outer side of the first housing wall 111" may specifically include: "step S2111, adjusting the relative positions of the housing 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 to it away from the housing 11, and the opening 113 of the housing 11 faces the conductive part" and "step S2112, installing the electrode component 3 and the conductive part 4 into the housing 11". Therefore, by placing the terminal component 2 at the end opposite to the opening 113 of the housing 11, it is beneficial to improve the cracking problem at the connection between the housing 11 and the cover 12 and improve the reliability of the battery cell 102.

[0267] Specifically, "Step S2111, adjusting the relative positions of the housing, electrode component, and conductive part so that the electrode component is located on the side of the conductive part connected to it away from the housing," can be achieved by adjusting the position of the housing 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 housing," can be achieved by pushing the electrode component, or by fitting the housing into the housing.

[0268] For example, 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 smoothly as the electrode component 3 is inserted into the shell body 11. That is, the action of the conductive part 4 passing through the mounting hole 112 is completed smoothly as the electrode component 3 is inserted into the shell, making the operation convenient and improving the processing efficiency.

[0269] For example, referring to Figures 10A-10D, when assembling the battery cell 102, the multi-layer tabs 311 in the tab portion 33 can be connected to form a gathering portion 313. Then, the electrode component 3 is installed into the housing 11 with the gathering portion 313 facing the active material coating portion 32 toward the mounting hole 112. As the electrode component 3 is installed into the housing 11, the gathering portion 313 passes through to the outside of the mounting hole 112. The gathering portion 313 is connected to the electrode post component 2 placed on the outside of the first housing wall 111. Then, the electrode post component 2 connected with the gathering portion 313 is covered by the mounting hole 112 from the outside of the first housing wall 111. After that, the electrode post component 2 covered by the mounting hole 112 is welded to the first housing wall 111.

[0270] Please refer to Figures 18A-18G, which are exploded views of the assembly process of a battery cell according to one embodiment of this application, and please refer to Figure 19, which is a flowchart of the assembly method of a battery cell according to some embodiments of this application. For example, when the cover 12 is the first shell wall 111, between "step S211, placing the electrode component 3 and the conductive part 4 connected to the electrode component 3 inside the first shell wall 111, and extending the conductive part 4 through the mounting hole 112 to the outside of the first shell wall 111" and "step S30a, placing the electrode post 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", the following steps are also included: "step S43, fitting the shell body 11 over the electrode component 3" and "step S44, connecting the shell body 11 to the cover 12".

[0271] In this embodiment, "step S212, connecting the conductive part 4 extending to the outside of the first shell wall 111 with the electrode body 21 of the electrode component 2 located on the outside of the first shell wall 111" can be performed after "step S44, connecting the shell body 11 with the shell cover 12" (for example, as shown in Figures 18A-18G); or, in other embodiments of this application, "step S212, connecting the conductive part 4 extending to the outside of the first shell wall 111 with the electrode body 21 of the electrode component 2 located on the outside of the first shell wall 111" can also be performed before "step S43, fitting the shell body 11 over the electrode component 3".

[0272] Therefore, by first connecting the housing 11 to the cover 12, and then connecting the electrode post 2 to the cover 12, the housing 11 can be used to house the electrode post 3 and support the cover 12. This facilitates the positioning and support of the cover 12, enabling the connection between the cover 12 and the adapter structure 22 and improving the reliability of the connection between the cover 12 and the electrode post 2. The method of connecting the housing 11 and the cover 12 is not limited; for example, it can be welding, bonding, etc.

[0273] Please refer again to Figures 18A-18G, and also to Figure 20. Figure 20 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, when the cover 12 is the first shell wall 111, the inner side of the cover 12 may have an insulating support 121. "Step S20a, connecting the electrode component 3 to the electrode post body 21" may also include "Step S41, placing the electrode component 3 with the conductive part 4 connected to it facing down, and placing the cover 12 with the insulating support 121 facing up" performed before "Step S43, putting the shell body 11 over the electrode component 3", and "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 is connected to the insulating support 121". "Step S43, putting the shell 11 on the electrode component 3" specifically includes: "Step S431, placing the shell 11 with the opening 113 facing down, and putting the shell 11 on the electrode component 3 covered with the insulating film 7 from top to bottom.

[0274] The step "Step S41, placing the electrode component 3 with the conductive part 4 connected to it facing downwards and placing the cover 12 with the insulating support 121 facing upwards" can be performed before "Step S211, placing the electrode component 3 and the conductive part 4 connected to the electrode component 3 inside the first shell wall 111 and passing the conductive part 4 through the mounting hole 112 to the outside 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 arranged), or it can be performed after "Step S211, placing the electrode component 3 and the conductive part 4 connected to the electrode component 3 inside the first shell wall 111 and passing the conductive part 4 through the mounting hole 112 to the outside of the first shell wall 111" (that is, the relative positions of the two can be arranged first, and then the conductive part 4 can be passed downwards).

[0275] 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," is performed with the insulating bracket 121 supported on the bottom of the active material coating portion 32, and with the conductive portion 4 protruding through the mounting hole 112 to the outside of the first shell wall 111. Because in this state, the electrode component 3 does not require other clamps for support and positioning, it facilitates quick operation.

[0276] In the above technical solution, when the shell 11 is fitted onto the electrode component 3, since the shell cover 12 is not connected to the electrode component 3, an insulating support 121 is provided on the inner side of the shell cover 12 (i.e. the side away from the active material coating part 32) to support the electrode component 3 from the bottom. In this way, no other limiting clamps are needed, and the problem of separation between the electrode component 3 and the shell cover 2 can be avoided. Therefore, during assembly, the shell 11 can be directly fitted from top to bottom, which simplifies the assembly process and reduces the use of limiting clamps, etc.

[0277] Please refer again to Figures 18A-18G and Figure 21. Figure 21 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, when the cover 12 is the first shell wall 111, the assembly of the battery cell 102 can be performed sequentially as follows: "Step S41: Place the electrode component 3 with the conductive part 4 connected to it facing downwards, and place the cover 12 with the insulating support 121 facing upwards", "Step S211: Place the electrode component 3 and the conductive part 4 connected to the electrode component 3 inside the first shell wall 111, and extend the conductive part 4 through the mounting hole 112 to the outside of the first shell wall 111", "Step S42: Cover the electrode component 3 supported on the top of the insulating support 121 with an insulating film 7". "Step S431: Place the shell 11 with the opening 113 facing down, and put the shell 11 over the electrode component 3 covered with the insulating film 7 from top to bottom." "Step S44: Connect the shell 11 to the shell cover 12." "Step S212: Connect the conductive part 4 that protrudes to the outside of the first shell wall 111 to the electrode body 21 of the electrode component 2 placed on the outside of the first shell wall 111." "Step S311: Cover the mounting hole 112 with the electrode component 2 connected to the conductive part 4 from the outside of the first shell wall 111 so that the adapter structure 22 abuts against the outside of the first shell wall 111." "Step S312: Connect the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111."

[0278] For example, referring again to Figures 18A-18G, when assembling the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). The stacked electrode assemblies 31 are bound together using a binding member 8 (such as blue adhesive). Multiple electrode tabs 311 of the same polarity of the multiple electrode assemblies 31 are stacked and brought together to form a stacked portion 312. The stacked portion 312 is clamped between two clamping portions 4110 of the conductive member 41, and the stacked portion 312 and the clamping portions 4110 are welded together to obtain… The conductive part 4, which is composed of the tab 33 and the conductive element 41, places the cover 12 below the active material coating part 32 and places the cover 12 with the insulating support 121 facing upward. The active material coating part 32 is supported above the insulating support 121. Then, an insulating film 7 is wrapped around the active material coating part 32, and the lower end of the insulating film 7 is heat-fused to the insulating support 121. Then, the shell body 11 is placed with the opening 113 facing downward, and the shell body 11 is fitted over the active material coating part 32 from top to bottom. The lower end of the shell body 11 is welded to the cover 12. Next, lay the shell 11 flat, with the mounting hole 112 open in the horizontal direction, connect the conductive part 4 to the pole member 2 located on the outside of the shell cover 12 on the outside of the shell cover 12, and then cover the mounting hole 112 from the outside of the shell cover 12 with the pole member 2 connected to the conductive part 4; then flip the shell 11 so that the shell cover 12 is located above the shell 11 and the pole member 2 is located on the top of the shell cover 12, and weld the adapter structure 22 to the shell cover 12 to fix it.

[0279] Please refer to Figure 22, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application, and refer to Figures 23A-23D, which are exploded views of the assembly process of a battery cell provided in one embodiment of this application; exemplaryly, "step S30a, setting the electrode post 2 connected to the electrode post 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 electrode post 2 connected to the electrode post 3 from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111"; "step S322, covering the mounting hole 112 with the electrode post 2 that has passed to the outside of the first shell wall 111 from the outside of the first shell wall 111, so that the adapter structure 22 abuts against the outside of the first shell wall 111"; "step S323, connecting the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111".

[0280] Here, "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; "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. The transition structure 22 abutting against the outer side of the first shell wall 111 means that the transition structure 22 is partially supported on a localized side of the first shell wall 111 away from the active material coating portion 32.

[0281] Therefore, since the electrode component 3 is connected to the terminal component 2 first, and then the terminal 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 terminal component 2. In other words, when connecting the electrode component 3 and the terminal component 2, the terminal component 2 and the electrode component 3 are not located on opposite sides of the first shell wall 111. This helps to further shorten the length of the conductive part 4, reduce the redundancy of the conductive part 4 after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell 102. Moreover, since the welding position of the terminal component 2 and the electrode component 3 is located on the outside of the shell 11, the problem of conductive debris formed during the welding process entering the interior of the shell 11 and damaging the electrode component 3 can be improved. Furthermore, since the pole piece 2 is installed on the mounting hole 112 from the outside of the first housing wall 111, the adapter structure 22 abuts against the outside of the first housing wall 111, and the adapter structure 22 is connected to the first housing wall 111 from the outside of the first housing wall 111, so as to facilitate the assembly and connection of the pole piece 2 and the first housing wall 111, which helps to improve the connection reliability of the pole piece 2 and the first housing wall 111.

[0282] For example, referring to Figures 23A-23D, when assembling the battery cell 102, the multi-layered tabs 311 in the tab portion 33 can be connected to form a gathered portion 313. Then, the gathered portion 313 is connected to the terminal post component 2. The terminal post component 2 with the gathered portion 313 is then passed from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111. Next, the terminal post component 2 with the gathered portion 313 is placed on the mounting hole 112 from the outside of the first shell wall 111. Finally, the terminal post component 2 placed on the mounting hole 112 is welded to the first shell wall 111. The processing steps of this embodiment are applicable to both scenarios where the shell cover 12 serves as the first shell wall 111 and scenarios where the shell body 11 includes the first shell wall 111.

[0283] Please refer to Figure 25, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. Referring again to Figures 23A-23D, in some embodiments of this application, the mounting hole 112 is an elongated hole (e.g., rectangular, elliptical, racetrack-shaped, etc.), and the electrode post 2 is formed as an elongated structure matching the shape of the mounting hole 112. Specifically, "Step S321, extending the electrode post 2 connected to the electrode post 3 from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111" may include: "Step S3213, adjusting the placement angle of the electrode post 2 so that the thickness direction of the electrode post 2 matches the width direction of the mounting hole 112, and the length direction of the electrode post 2 forms an angle with the length direction of the mounting hole 112"; and "Step S3214, extending the electrode post 2 through the mounting hole 112 to the outside of the first shell wall 111 according to the placement angle."

[0284] Therefore, by first adjusting the placement angle of the terminal component 2 and then passing it through the mounting hole 112, the terminal component 2 can pass smoothly through the mounting hole 112, improving assembly efficiency and reducing the risk of collision and scratches between the terminal component 2 and the housing component 1. Furthermore, by setting the terminal component 2 as an elongated structure matching the shape of the mounting hole 112, the terminal component 2 can be adjusted to pass through the mounting hole 112 at an angle close to its thickness direction and width direction. After passing through the mounting hole 112, the thickness direction of the terminal component 2 can be rotated to be close to the thickness direction of the first housing wall 111. This reduces the space required for the flipping movement of the terminal component 2, thereby shortening the length of the conductive part 4, saving materials, reducing costs, and reducing redundancy in the conductive part 4, thus reducing the space occupied by the conductive part 4 in the receiving cavity 13 and improving the energy density of the battery cell 102. However, this application is not limited to this; the mounting hole 112 and the terminal component 2 can also be processed into other shapes, such as circles, polygons, etc.

[0285] Please refer to Figure 26, which is a schematic diagram of the assembly of the mounting hole and the pole piece provided in some embodiments of this application (for example, Figure 26 can be understood as the pole piece 2 passing through the mounting hole 112 in a direction perpendicular to the plane of the paper). Specifically, making the length direction of the pole piece 2 form an angle with the length direction of the mounting hole 112 can be achieved by matching the length direction of the pole piece 2 with the diagonal direction of the mounting hole 112. Therefore, by arranging the length direction of the pole piece 2 as described above, it is beneficial for the pole piece 2 to pass smoothly through the mounting hole 112, improving assembly efficiency and reducing the risk of collision and scratches between the pole piece 2 and the housing component 1.

[0286] Please refer to Figure 27, which is a schematic diagram of the assembly of the mounting hole and the pole piece provided in some other embodiments of this application (for example, Figure 27 can be understood as the pole piece 2 passing through the mounting hole 112 along the direction of the arrow); or, by way of example, the length direction of the pole piece 2 is made at an angle to the length direction of the mounting hole 112. Specifically, the length direction of the pole piece 2 extends from one end of the length of the mounting hole 112 to the other end, and is inclined to the length direction of the mounting hole 112. Thus, by arranging the length direction of the pole piece 2 as described above, it is beneficial for the pole piece 2 to pass smoothly through the mounting hole 112, improving assembly efficiency and reducing the risk of collision and scratching between the pole piece 2 and the housing component 1.

[0287] Please refer to Figure 28, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, when the end of the housing 11 opposite to the opening 113 is the first housing wall 111; "Step S321, passing the electrode post 2 connected to the electrode component 3 from the inside of the first housing wall 111 through the mounting hole 112 to the outside of the first housing wall 111" may specifically include: "Step S3211, adjusting the relative positions of the housing 11, the electrode component 3 and the electrode post 2 so that the electrode component 3 is located on the side of the electrode post 2 connected to it away from the housing 11, and the opening 113 of the housing 11 faces the electrode post 2"; "Step S3212, installing the electrode component 3 and the electrode post 2 into the housing".

[0288] In the above technical solution, by setting the electrode post 2 at the end opposite to the opening 113 of the housing 11, it is beneficial to improve the cracking problem at the connection between the housing 11 and the cover 12 and improve the reliability of the battery cell 102.

[0289] In some embodiments of this application, please refer again to FIG28. The step S321, "the pole member 2 connected to the electrode member 3 is passed from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111", may specifically include the following steps performed in sequence: "Step S3211, adjusting the relative positions of the shell body 11, the electrode member 3 and the pole member 2, so that the electrode member 3 is located on the side of the pole member 2 connected to it away from the shell body 11, and the opening 113 of the shell body 11 faces the pole member 2", "Step S3212, inserting the electrode member 3 and the pole member 2 into the shell body", "Step S3213, adjusting the placement angle of the pole member 2 so that the thickness direction of the pole member 2 matches the width direction of the mounting hole 112, and the length direction of the pole member 2 forms an angle with the length direction of the mounting hole 112", and "Step S3214, making the pole member 2 pass through the mounting hole 112 to the outside of the first shell wall 111 according to the placement angle". That is, after installing the electrode component 3 and the pole component 2 into the housing, the placement angle of the pole component 2 is then adjusted.

[0290] The execution order of "Step S321, extending the electrode post 2 connected to the electrode component 3 from the inside of the first housing wall 111 through the mounting hole 112 to the outside of the first housing wall 111" is not limited to the above embodiments. Please refer to Figure 29, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. For example, it can also be executed in the following order: "Step S3211, adjusting the relative positions of the housing 11, the electrode component 3, and the electrode post 2 so that the electrode component 3 is located at the electrode post 2 connected to it." "On the side away from the housing 11, with the opening 113 of the housing 11 facing the electrode component 2", "Step S3213: Adjust the placement angle of the electrode component 2 so that the thickness direction of the electrode component 2 matches the width direction of the mounting hole 112, and the length direction of the electrode component 2 forms an angle with the length direction of the mounting hole 112", "Step S3212: Install the electrode component 3 and the electrode component 2 into the housing", "Step S3214: Make the electrode component 2 protrude from the mounting hole 112 to the outside of the first housing wall 111 according to the placement angle". That is, before installing the electrode component 3 and the electrode component 2 into the housing, the placement angle of the electrode component 2 is adjusted first.

[0291] For example, please refer to Figures 30A-30D, which are exploded views of the assembly process of a battery cell according to an embodiment of this application. When the end wall opposite the opening 113 of the housing 11 serves as the first housing wall 111, when assembling the battery cell 102, the multi-layered tabs 311 in the tab portion 33 can be connected to form a gathered portion 313. Then, the gathered portion 313 is connected to the terminal post component 2. Next, the terminal post component 2 is placed on the side of the electrode component 3 near the mounting hole 112 to insert the terminal post component 2 and the electrode component 3. As the electrode component 2 and electrode component 3 are inserted into the housing 11, the electrode component 2 moves to a position close to the mounting hole 112. At this time, the placement angle of the electrode component 2 can be adjusted to the above state. Then, the electrode component 3 is pushed into the housing 11 so that the electrode component 2, which meets the placement angle, can pass through the mounting hole 112. Next, the electrode component 2 with the retractable part 313 is placed on the mounting hole 112 from the outside of the first housing wall 111. Then, the electrode component 2 placed on the mounting hole 112 is connected to the first housing wall 111.

[0292] For example, the action of the electrode post 2 passing through the mounting hole 112 can be completed smoothly as the electrode post 3 enters the housing, thereby making the operation convenient and improving the processing efficiency.

[0293] Please refer to Figures 31A-31D, and in conjunction with Figures 32 and 33. Figures 31A-31D are exploded views of the assembly process of a battery cell provided in one embodiment of this application; Figure 32 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; Figure 33 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; In some embodiments of this application, when the cover is the first shell wall 111, after "step S321, passing the electrode post 2 connected to the electrode component 3 from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111", it may also include: "step S43, fitting the shell body 11 over the electrode component 3" and "step S44, connecting the shell body 11 to the cover 12".

[0294] Among them, "step S322, covering the mounting hole 112 with the pole post component 2 protruding to the outside of the first shell wall 111 from the outside of the first shell wall 111, so that the adapter structure 22 abuts against the outside of the first shell wall 111" and "step S323, connecting the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111" can be performed after "step S44, connecting the shell body 11 to the shell cover 12" (for example, as shown in Figure 32). In this way, since the connection between the shell body 11 and the shell cover 12 is completed first, and then the connection between the pole post component 2 and the shell cover 12 is performed, the shell body 11 can be used to support the shell cover 12. This facilitates the positioning and support of 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 post component 2.

[0295] Alternatively, in other embodiments of this application, "step S322, covering the mounting hole 112 with the pole member 2 protruding to the outside of the first shell wall 111 from the outside of the first shell wall 111, so that the adapter structure 22 abuts against the outside of the first shell wall 111" and "step S323, connecting the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111" can also be performed before "step S43, putting the shell body 11 over the electrode member 3" (for example, as shown in FIG33). In this way, when connecting the pole member 2 and the shell cover 12, since the shell body 11 and the shell cover 12 are not yet connected, the force connecting the pole member 2 and the shell cover 12 will not be transmitted to the connection between the shell body 11 and the shell cover 12, thus improving the cracking problem at the connection between the shell body 11 and the shell cover 12.

[0296] The connection method between the shell body 11 and the shell cover 12 is not limited; for example, it can be welding, bonding, etc.

[0297] Please refer to Figures 34A-34D and Figure 35. Figures 34A-34D are exploded views of the assembly process of a battery cell provided in one embodiment of this application; Figure 35 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, "step S30a, setting the electrode post 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 both the electrode post 2 connected to the electrode component 3 and the electrode component 3 inside the first shell wall 111"; "step S332, covering the mounting hole 112 from the inside of the first shell wall 111 with the electrode post 2 connected to the electrode component 3, so that the adapter structure 22 abuts against the inside of the first shell wall 111"; "step S333, connecting the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111".

[0298] In the above technical solution, since the terminal post 2 covers the mounting hole 112 from the inside of the first shell wall 111, neither the conductive part 4 nor the terminal post 2 needs to pass through the mounting hole 112, thereby reducing processing steps and operational difficulty. Furthermore, since the adapter structure 22 connects to the first shell wall 111 from the outside, it facilitates the assembly and connection of the terminal post 2 and the first shell wall 111, improving the connection reliability between the terminal post 2 and the first shell wall 111. In addition, since the electrode part 3 is connected to the terminal post 2 first, and then the terminal post 2 and electrode part 3 are placed inside the first shell wall 111, there is no need to consider avoiding the first shell wall 111 when connecting the electrode part 3 and the terminal post 2. In other words, when connecting the electrode part 3 and the terminal post 2, the terminal post 2 and electrode part 3 are not located on opposite sides of the first shell wall 111, which helps to further shorten the length of the conductive part 4, reduce redundancy of the conductive part 4 after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell 102. Furthermore, since the welding position of the pole piece 2 and the electrode piece 3 is located outside the housing 11, the problem of conductive debris generated during the welding process entering the interior of the housing 11 and damaging the electrode piece 3 can be improved.

[0299] For example, referring to Figures 34A-34D, when assembling the battery cell 102, the multi-layered tabs 311 in the tab portion 33 can be connected to form a gathered portion 313. Then, the gathered portion 313 is connected to the terminal post component 2. The terminal post component 2 with the electrode component 3 connected to it and the electrode component 3 are placed inside the first shell wall 111. Next, the terminal post component 2 with the electrode component 3 connected to it is placed from the inside of the first shell wall 111 onto the mounting hole 112. Then, the terminal post component 2 placed on the mounting hole 112 is connected to the first shell wall 111. For example, the processing steps of this embodiment are applicable to both scenarios where the shell cover 12 serves as the first shell wall 111 and scenarios where the shell body 11 includes the first shell wall 111.

[0300] Please refer to Figures 36A-36D and Figure 37. Figures 36A-36D are exploded views of the assembly process of a battery cell provided in one embodiment of this application; Figure 37 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, when the end of the shell 11 opposite to the opening 113 is the first shell wall 111, "step S331, placing both the electrode post 2 connected to the electrode component 3 and the electrode component 3 inside the first shell wall 111" may specifically include: "step S3311, adjusting the relative positions of the shell 11, the electrode component 3 and the electrode post 2, so that the electrode component 3 is located on the side of the electrode post 2 connected to it away from the shell 11, and the opening 113 of the shell 11 faces the electrode post 2"; "step S3312, installing the electrode component 3 and the electrode post 2 into the shell 11".

[0301] Therefore, by placing the terminal component 2 on the housing 11, it is beneficial to improve the cracking problem at the connection between the housing 11 and the cover 12 and improve the reliability of the battery cell 102.

[0302] For example, referring to Figures 36A-36D, when the end wall opposite the opening 113 of the housing 11 serves as the first housing wall 111, when assembling the battery cell 102, the multi-layered tabs 311 in the tab portion 33 can be connected to form a folding portion 313. Then, the folding portion 313 is connected to the terminal component 2. Next, the terminal component 2 is placed on the side of the electrode component 3 near the mounting hole 112 so that the electrode component 3 and the terminal component 2 are installed into the housing 11. As the terminal component 2 and the electrode component 3 are installed into the housing 11, the terminal component 2 moves to a position near the mounting hole 112. At this time, the angle of the terminal component 2 can be adjusted to cover the mounting hole 112. Then, the electrode component 3 is pushed into the housing 11 so that the terminal component 2 can cover the mounting hole 112 from the inside of the first housing wall 111. After that, the terminal component 2 located in the mounting hole 112 is welded to the first housing wall 111 from the outside of the first housing wall 111. In this way, the action of covering the mounting hole 112 with the electrode component 2 is completed simultaneously with the action of inserting the electrode component 3 into the housing, making the operation convenient and improving the processing efficiency.

[0303] Please refer to Figure 38, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. When the cover 12 is the first shell wall 111, after "step S333, connecting the adapter structure 22 to the first shell wall 111 from the outside", the following steps may also be included: "step S43, putting the shell body 11 on the outside of the electrode component 3" and "step S44, connecting the shell body 11 to the cover 12".

[0304] Therefore, by first connecting the electrode post 2 to the cover 12, and then assembling the housing 11 to the cover 12, when connecting the electrode post 2 and the cover 12, since the outer side of the electrode post 3 is not yet covered by the housing 11, it can contact the electrode post 3. By applying force to the electrode post 3, the electrode post 2 can be held against the cover 12. Alternatively, the conductive part 4 can be lengthened to apply force directly to the electrode post 2 from the inside of the cover 12, so that the electrode post 2 is held against the cover 12. This ensures a reliable and effective connection between the electrode post 2 and the cover 12. The method of connecting the housing 11 and the cover 12 is not limited; for example, it can be welding, bonding, etc.

[0305] Please refer to Figures 39 and 40. Figure 39 is a top view of a battery cell provided in some embodiments of this application; Figure 40 is a cross-sectional view along line AA in Figure 39. In some embodiments of this application, the insulating structure 23 is also sealed between the adapter structure 22 and the terminal body 21. Thus, the insulating structure 23 not only insulates the adapter structure 22 from the terminal body 21, but also seals the mating position of the adapter structure 22 and the terminal body 21. This isolates the inside and outside of the housing component 1 after the adapter structure 22 is connected to the first housing wall 111, reducing the risk of electrolyte leakage from the mating position of the adapter structure 22 and the terminal body 21 to the outside of the housing component 1, and reducing the risk of liquids or dust from outside the housing component 1 entering the housing component 1 from the mating position of the adapter structure 22 and the terminal body 21, thereby improving the reliability of the battery cell 102.

[0306] In the above technical solution, since the insulating structure 23 is also sealed 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 is connected to the first shell wall 111, there is no need to set a seal between the transition structure 22 and the first shell wall 111. This eliminates the need to apply a large sealing pressure to meet the compression requirements of the seal, thereby reducing the stress on the first shell wall 111 and protecting the shell component 1. This helps to reduce the wall thickness of the shell component 1 and lower material costs. Furthermore, when the first shell wall 111 is the end opposite the shell body 11 and the opening 113, the stress at the connection between the first shell wall 111 and the second shell wall 114, as well as the stress on the second shell wall 114, can be reduced. This helps to ensure the reliability of the shell body 11 and lower the wall thickness and cost of the shell body 11.

[0307] Please refer to Figures 39-40. In some embodiments of this application, the insulating structure 23 includes a sealing structure 231. In embodiments of this application, the sealing structure 231 is made of a material that is both sealing and insulating, such as an elastic rubber component. At least a portion of the sealing structure 231 is clamped between the adapter structure 22 and the pole body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first housing wall 111.

[0308] In the embodiments of this application, the directions from the inner side to the outer side of the first shell wall 111, and the directions from the outer side to the inner side of the first shell wall 111, are collectively referred to as "the inner and outer directions of the first shell wall 111 (e.g., the fifth direction F5)". "The inner side of the first shell wall 111" refers to the side of the first shell wall 111 facing the electrode component 3, and "the outer side of the first shell wall 111" refers to the side of the first shell wall 111 away from the electrode component 3.

[0309] The sealing structure 231 includes at least a axial side portion 231a. The side of the axial side portion 231a facing the receiving cavity 13 is the inner side of the axial side portion 231a, and the side of the axial side portion 231a away from the electrode component 3 is the outer side of the axial side portion 231a. One of the transition structure 22 and the electrode body 21 is partially clamped on the outer side of the axial side portion 231a, and the other is partially clamped on the inner side of the axial side portion 231a. Thus, the axial side portion 231a is clamped between the transition structure 22 and the electrode body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111 to achieve an axial seal between the transition structure 22 and the electrode body 21.

[0310] Therefore, by providing at least a portion of the sealing structure 231 sandwiched between the transition structure 22 and the pole body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111, an axial seal is achieved between the transition structure 22 and the pole body 21. This axial seal provides a more reliable sealing effect and improves the leakage problem at the mating position of the transition structure 22 and the pole body 21. Furthermore, by integrating the axial seal (such as the axial side portion 231a) into the pole component, the axial force on the first shell wall 111 can be reduced in the embodiments of this application.

[0311] Please refer to Figures 41-44. Figure 41 is a schematic diagram of the pole post component provided in some embodiments of this application; Figure 42 is a top view of the pole post component shown in Figure 41; Figure 43 is a view along direction B shown in Figure 42; Figure 44 is a cross-sectional view along line CC in Figure 42. Exemplarily, the sealing structure 231 is arranged around the periphery of the adapter structure 22 facing the pole post body 21 (i.e., the inner ring of the adapter structure 22). In the embodiments of this application, since the adapter structure 22 is arranged around the pole post body 21 and connected to the first shell wall 111, the periphery of the adapter structure 22 facing the pole post body 21 is the "inner ring 2211 of the adapter structure 22", and the periphery 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 placing the sealing structure 231 around the inner ring of the transition structure 22, the sealing structure 231 can be close to the mating position between the transition structure 22 and the pole body 21. This facilitates sealing the mating position between the transition structure 22 and the pole body 21 with a shorter path, improving the reliability of the seal. It also helps to reduce the size of the sealing structure 231, reduce the sealing area, and make it easier to achieve compression sealing, making the seal less prone to failure and improving the sealing effect.

[0312] Please refer again to Figures 41-44. For example, when the insulating structure 23 includes a sealing structure 231, which is sandwiched between the transition structure 22 and the pole body 21 to make the transition structure 22 and the pole body 21 seal together, and the transition structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 111, and the pole body 21 is located at the center of the length of the transition structure 22 and is circular, the force at the connection position between the transition structure 22 and the pole body 21 is uniform, making it easy to control the compression of the sealing structure 231, thereby improving the reliability of the seal between the transition structure 22 and the pole body 21. Moreover, the sealing area is relatively small and is not prone to failure.

[0313] Please refer to Figure 45, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; and in conjunction with Figures 39-44, in some embodiments of this application, before "step S20a, connecting the electrode component 3 to the electrode post body 21", the method may further include: "step S50, providing the electrode post component 2", so that the electrode post component 2 includes the electrode post body 21, the transition structure 22 and the insulating structure 23, the electrode component 3 is connected to the electrode post body 21, the transition structure 22 surrounds the electrode post body 21 and is connected to the first shell wall 111, the insulating structure 23 is insulatingly fitted between the transition structure 22 and the electrode post body 21, the insulating structure 23 includes a sealing structure 231, the sealing structure 231 is circumferentially disposed on the side of the transition structure 22 facing the electrode post body 21, and at least partially clamped between the transition structure 22 and the electrode post body 21 in the inward and outward directions of the first shell wall 111.

[0314] Therefore, by processing the electrode component 2 into a form where the transition structure 22 and the electrode body 21 are sealed together by the sealing structure 231 before "step S20a, connecting the electrode component 3 to the electrode body 21", the sealing structure 231 can be used to seal the electrode component 22 to the electrode body 21. In the subsequent "step S30a, placing the electrode component 2 connected to the electrode component 3 at the mounting hole 112 and connecting the transition structure 22 to the first shell wall 111", a sealing element is no longer needed between the transition structure 22 and the first shell wall 111. This eliminates the need to apply significant sealing pressure to meet the compression requirements of the sealing element, thereby reducing the stress on the first shell wall 111. Furthermore, when the first shell wall 111 is the end opposite the opening 113 of the shell body 11, the stress at the connection between the first shell wall 111 and the second shell wall 114, as well as the stress on the second shell wall 114, can be reduced. This helps ensure the reliability of the shell body 11 and reduces the wall thickness and cost of the shell body 11.

[0315] Exemplary examples show that the terminal 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 FIG11 (the conductive part 4 of the electrode component 3 first passes through the mounting hole 112, the conductive part 4 is welded to the terminal component 2 outside the mounting hole 112, and the terminal component 2 then covers the mounting hole 112 from the outside of the first shell wall 111), or as shown in FIG30A-28D (the electrode component 3 and the terminal component 2 are first welded, the terminal component 2 passes through the mounting hole 112, and then covers the mounting hole 112 from the outside of the first shell wall 111), or as shown in FIG34A-32D (the electrode component 3 and the terminal component 2 are first welded, the terminal component 2 does not pass through the mounting hole 112, and covers the mounting hole 112 from the inside of the first shell wall 111), the terminal component 2 including the sealing structure 231 in this embodiment can be used.

[0316] Please refer to Figures 44 and 46. Figure 46 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, the electrode body 21 includes a peripheral portion 212. The adapter structure 22 is clamped on both sides of the peripheral portion 212 in the inward and outward directions of the first shell wall 111 by the insulating structure 23. At least a portion of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the electrode component 3 and the adapter structure 22. "Step S50, providing the electrode component 2" may specifically include: "Step S51, assembling or shaping the adapter structure 22 to complete the clamping of the peripheral portion 212 and the sealing structure 231 by the adapter structure 22". Thus, only the adapter structure 22 needs to be operated on, without operating the electrode body 21, to complete the provision of the electrode component 2, thereby simplifying the operation, making the processing of the electrode component 2 easier, and achieving a simple and effective relative fixation and insulating fit between the electrode body 21 and the adapter structure 22.

[0317] Referring to Figure 44, the peripheral portion 212 can be the outer peripheral structure of the pole body 21. Since the sealing structure 231 is arranged around the periphery of the transition structure 22 facing the pole body 21, the sealing structure 231 can 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 receiving cavity 13 is the inner side of the peripheral portion 212. The transition structure 22 is limited to the outer side of the peripheral portion 212 by the insulating structure 23 to restrict the movement of the electrode body 21 relative to the transition structure 22 in the direction away from the electrode component 3. The transition structure 22 is also limited to the inner side of the peripheral portion 212 by the insulating structure 23 to restrict the movement of the electrode body 21 relative to the transition structure 22 in the direction towards the receiving cavity 13. Thus, the transition structure 22 is clamped on both sides of the peripheral portion 212 by the insulating structure 23 in the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111.

[0318] In the above technical solution, the sealing structure 231 is clamped between the peripheral portion 212 of the electrode body 21 and the transition structure 22. This allows the sealing structure 231 to be positioned at the mating point between the transition structure 22 and the electrode body 21, facilitating a shorter path for sealing the mating point and improving sealing reliability. Furthermore, it reduces the size of the sealing structure 231, decreases the sealing area, and makes compression sealing easier, reducing the likelihood of seal failure and improving sealing performance. Moreover, since at least a portion of the sealing structure 231 is clamped between the peripheral portion 212 facing the electrode component 3 and the transition structure 22, the sealing structure 231 can seal from the peripheral portion 212 facing the receiving cavity 13, more effectively suppressing electrolyte leakage from the mating point between the electrode body 21 and the transition structure 22, thereby improving the sealing effect.

[0319] Referring again to Figure 44, exemplarily, the insulating structure 23 further includes a first insulating member 232. The transition structure 22 is clamped to both sides of the peripheral portion 212 along the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111 via the first insulating member 232 and the sealing structure member 231. In this embodiment, the configuration of the transition structure 22 is not limited; it can be a single component or a combination of multiple components (e.g., two or more).

[0320] Since at least a portion of the sealing structure 231 (such as the axial portion 231a) is located on the side of the peripheral portion 212 facing the electrode component 3, at least a portion of the first insulating member 232 is located on the side of the peripheral portion 212 away from the electrode component 3. The transition structure 22 can be 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 by the first insulating member 232 and the sealing structure 231 respectively.

[0321] In the above technical solution, since the insulation structure 23 includes a first insulating component 232 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulation structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the first insulating component 232 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. In addition, when the first insulating component 232 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0322] Alternatively, in some other embodiments of this application, the sealing structure 231 can also be a single-piece structure with an outer periphery 212, located on the side of the periphery 212 facing the electrode component 3 and the side facing away from the electrode component 3, respectively. The transition structure 22 can be clamped on both sides of the periphery 212 along the inward and outward directions of the first shell wall 111 by the sealing structure 231. That is, the sealing structure 231 is a single-piece annular structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the periphery 212, respectively. In this way, the transition structure 22 can be clamped on both sides of the periphery 212 along the inward and outward 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 a single-piece structure with an outer periphery 212, the number of parts and assembly processes can be reduced.

[0323] Please refer again to Figure 44. In some embodiments of this application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is disposed 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 sandwiched between the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232.

[0324] For example, the first adapter ring 221 and the second adapter ring 222 can be welded, riveted, drilled, or bonded together. For instance, the first adapter ring 221 can be welded, riveted, drilled, or bonded to the first shell wall 111. Exemplarily, both the first adapter ring 221 and the second adapter ring 222 are made of aluminum and are welded together, and both the first adapter ring 221 and the first shell wall 111 are made of aluminum and are welded together, which helps to improve the welding yield.

[0325] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 that are arranged internally and externally and assembled together, which facilitates the assembly and connection of the adapter structure 22 with the insulation structure 23 and the pole body 21, making the pole component 2 easy to process and manufacture, and making it easy to control the compression of the sealing structure component 231, thereby improving the sealing reliability.

[0326] The method by which the second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232 is not limited.

[0327] For example, referring again to Figure 44, the first insulating member 232 and the second transition ring 222 can be injection molded separately to insulate the periphery 212. For example, when processing the pole component 2, the pole body 21 and the second transition ring 222 can be injection molded together to obtain the first insulating member 232, and then the sealing structure 231 and the first transition ring 221 can be assembled, and then the first transition ring 221 and the second transition ring 222 can be connected (e.g., welded) to press the sealing structure 231.

[0328] For example, please refer to Figure 47, which is a cross-sectional view of the pole component provided in some embodiments of this 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. The material of the first insulating member 232 is not limited, and it may be a plastic part or an elastic rubber part. For example, when processing the pole component 2, the pole body 21, the sealing structure 231 and the first adapter ring 221 can be assembled first, and then the first insulating member 232 and the second adapter ring 222 can be assembled. Then, the first adapter ring 221 and the second adapter ring 222 can be connected (e.g., welded), and the sealing structure 231 can be pressed tightly.

[0329] Referring again to Figure 44, the adapter structure 22, by way of example, further includes a first insulating frame 224, which is connected to the side of the first adapter ring 221 facing the electrode component 3. Thus, the first insulating frame 224 can serve as insulation between the electrode component 3 and the first adapter ring 221, reducing the difficulty of setting up the insulation structure here. By way of example, the first insulating frame 224 has a pin, and the first adapter ring 221 has a hole; the pin is interference-fitted into the hole to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0330] Please refer to Figures 48 and 49. Figure 48 is a cross-sectional view of the pole member provided in some embodiments of this application, and Figure 49 is a cross-sectional view of the pole member provided in some embodiments of this application. In some embodiments of this application, the adapter structure 22 includes a third adapter ring 223, which includes an integrally formed inner extension 2231 and an outer extension 2232. That is, the inner extension 2231 and the outer extension 2232 are different parts of a single integral component, rather than two separate parts that are assembled and connected.

[0331] The inner extension 2231, facing the pole body 21 (i.e., the inner ring of the inner extension 2231), and the outer extension 2232, facing the pole body 21 (i.e., the inner ring of the outer extension 2232), are spaced apart in the inner and outer directions, respectively, by the insulating structure 23 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111, and clamped on both sides of the peripheral portion 212. The sealing structure 231 is clamped between the inner extension 2231 and the peripheral portion 212, and the outer extension 2232 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232.

[0332] The connection method between the third adapter ring 223 and the first shell wall 111 is not limited; for example, it can be welded, riveted, drilled, or bonded. For example, both the third adapter ring 223 and the first shell wall 111 are made of aluminum and are welded together, which helps to improve the welding yield.

[0333] The way in which the outer extension 2232 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232 is not limited.

[0334] For example, referring again to Figure 48, the outer extension 2232 rivets and presses the first insulating member 232 against the peripheral portion 212. The material of the first insulating member 232 is not limited; for example, it can be a plastic part or an elastic rubber part. 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 2232 of the third adapter ring 223 can be riveted, so that the outer extension 2232 rivets and presses the first insulating member 232 against the peripheral portion 212, thus pressing the sealing structure 231 tightly.

[0335] For example, referring to Figure 49, the first insulating member 232 and the pole body 21, as well as the first insulating member 232 and the outer extension 2232, are respectively injection molded together. 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 injection molded together to obtain the first insulating member 232, and then the sealing structure 231 can be assembled. After that, 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.

[0336] Referring again to Figure 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. Thus, the second insulating frame 225 can serve as insulation between the electrode component 3 and the third adapter ring 223, eliminating the need for a separate insulating structure. Exemplarily, the second insulating frame 225 has a pin, and the third adapter ring 223 has a socket; the pin is interference-fitted into the socket to connect the second insulating frame 225 and the third adapter ring 223.

[0337] Please refer to Figure 50, which is an exploded view of the processing of the third adapter ring provided in some embodiments of this application. For example, when the adapter structure 22 includes a third adapter ring 223, and the third adapter ring 223 has an inner extension 2231 and an outer extension 2232, the shaping steps of the adapter structure 22 can be as follows: first, a metal plate is provided, then a protrusion is stamped on the metal plate, then the periphery outside the protrusion is thinned to obtain one of the inner extension 2231 and the outer extension 2232, and then a hole is punched at the position of the protrusion to obtain the other of the inner extension 2231 and the outer extension 2232.

[0338] Please refer to Figure 51, which is an exploded view of the manufacturing process of the pole piece provided in some embodiments of this application. For example, when the pole piece 2 is manufactured using the third adapter ring 223, the third adapter ring 223 is first manufactured, for example, as shown in Figure 50. Then, the third adapter ring 223 is injection molded to the pole piece body 21 to obtain the first insulating member 232. Next, the sealing structure member 231 is assembled. Then, through a riveting process, the inner extension 2231 presses against the sealing structure member 231. Finally, the second insulating frame 225 is assembled onto the third adapter ring 223. Thus, by shaping the third adapter ring 223, the clamping of the sealing structure member 231 by the peripheral portion 212 and the inner extension 2231 of the adapter structure 22 is completed.

[0339] Please refer to Figures 52 and 53. Figure 52 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; Figure 53 is a partial cross-sectional view of a battery cell provided in some embodiments of this application. In some embodiments of this application, the adapter structure 22 includes a mating ring portion 2271, the terminal body 21 includes a through portion 214 passing through the mating ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the through portion 214 and clamped on the inner and outer sides of the mating ring portion 2271. At least a portion of the sealing structure 231 is clamped between the mating ring portion 2271 and the inner limiting portion 215. "Step S50, providing the terminal component 2" may specifically include: "Step S52, assembling or shaping the terminal body 21 to complete the clamping of the sealing structure 231 by the mating ring portion 2271 and the terminal 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 achieving a simple and effective relative fixation and insulating fit between the pole body 21 and the adapter structure 22.

[0340] In the above technical solution, the sealing structure 231 is clamped at the mating position of the electrode body 21 and the mating ring 2271. This allows the sealing structure 231 to be positioned at the mating position of the transition structure 22 and the electrode body 21, facilitating a shorter path for sealing the mating position and improving sealing reliability. Furthermore, it reduces the size of the sealing structure 231, decreases the sealing area, and makes compression sealing easier, reducing the likelihood of seal failure and improving sealing performance. Moreover, since at least a portion of the sealing structure 231 is clamped between the mating ring 2271 and the inner limiting portion 215, the sealing structure 231 can seal from the side of the mating ring 2271 facing the receiving cavity 13, more effectively suppressing electrolyte leakage from the mating position of the electrode body 21 and the transition structure 22, thereby improving the sealing effect.

[0341] Referring to Figure 53, the adapter structure 22 includes a fourth adapter ring 227, which includes a mating ring portion 2271. 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, it can be welded, riveted, drilled, or bonded. For example, both the fourth adapter ring 227 and the first shell wall 111 are made of aluminum and are welded together, which helps to improve the welding yield.

[0342] Please refer again to Figure 53. The insulating structure 23 may also include a second insulating member 234, wherein at least a portion of the sealing structure 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.

[0343] In the above technical solution, since the insulation structure 23 includes a second insulating component 234 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulation structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the second insulating component 234 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. In addition, when the second insulating component 234 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0344] Please refer to Figure 54, which is a partial cross-sectional view of a battery cell provided in some embodiments of this application; or, in some other embodiments of this application, the sealing structure 231 may also be an integral structure and surround a mating ring 2271, located on the side of the mating ring 2271 facing the electrode component 3 and the side away from the electrode component 3, respectively. The electrode post body 21 is clamped on both sides of the mating ring 2271 by the sealing structure 231 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111. That is, the sealing structure 231 is an integral ring structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the mating ring 2271, respectively. In this way, the transition structure 22 can be clamped on both sides of the mating ring 2271 along the inner and outer directions (e.g., the fifth direction F5) 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 surrounds the mating ring 2271, the number of parts and assembly steps can be reduced.

[0345] In the embodiments of this application, when the pole body 21 includes a through portion 214, and an inner limiting portion 215 and an outer limiting portion 216 connected to the through portion 214 and clamped on both sides of the mating ring portion 2271, the configuration of the pole body 21 is not limited. It can be a single part or a combination of multiple parts (such as two or more).

[0346] Please refer again to Figure 53; by way of example, the outer limiting part 216 and the through part 214 are assembled and connected on the side of the mating ring part 2271 opposite to the inner limiting part 215. The assembly and connection method of the outer limiting part 216 and the through part 214 is not limited, such as welding, drilling, bonding, etc. Assembly and connection refers to the connection of two parts together through a connection process. Therefore, by setting the outer limiting part 216 and the through part 214 as separate parts and assembling them, the structure of the pole body 21 is simple and easy to assemble and connect with the transition structure 22. Furthermore, when the outer limiting part 216 and the through part 214 are welded, the thermal impact on the sealing structure 231 clamped between the inner limiting part 215 and the mating ring part 227 can be reduced, improving the sealing reliability of the sealing structure 231.

[0347] In the above embodiments, the connection method between the through-hole portion 214 and the inner limiting portion 215 is not limited; they can be an integral part or separate parts pre-connected together. For example, the end of the through-hole portion 214 facing away from the inner limiting portion 215 may include a riveting portion 2141. During assembly, the through-hole portion 214 can be inserted through the mating ring portion 2271 fitted with the insulating structure 23 along the direction from the inner limiting portion 215 to the outer limiting portion 216. Then, the riveting portion 2141 is riveted to restrict the through-hole portion 214 from disengaging along the direction from the outer limiting portion 216 to the inner limiting portion 215. Afterward, the riveting portion 2141 and the outer limiting portion 216 can be connected, facilitating the connection between the through-hole portion 214 and the outer limiting portion 216, for example, by welding. Alternatively, the riveting portion 2141 can be omitted, eliminating the riveting process after the through-hole portion 214 is inserted.

[0348] Referring to Figures 54 and 55, Figure 55 is a partial cross-sectional view of a battery cell provided in some embodiments of this application. In some other embodiments of this application, the outer limiting part 216 and the through part 214 are integral, and the outer limiting part 216 rivets the second insulating member 234 against the mating ring part 2271. In the above technical solution, the assembly connection between the outer limiting part 216 and 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 part 216 is connected to the insulating structure 23 and the transition structure 22 on the sealing structure member 231, and improves the sealing reliability of the sealing structure member 231. In addition, by riveting the outer limiting part 216 to press the second insulating member 234 against the mating ring part 2271, the compression amount of the sealing structure member 231 can be easily controlled, achieving a better compression effect.

[0349] In the above embodiments, the connection method between the through-hole portion 214 and the inner limiting portion 215 is not limited. It can be an integral part (for example, as shown in FIG. 54), or it can be a separate part that is pre-connected together (for example, as shown in FIG. 55). Exemplarily, during assembly, the through-hole portion 214 can be threaded through the mating ring portion 2271 with the insulating structure 23 along the direction from the inner limiting portion 215 to the outer limiting portion 216, and then the outer limiting portion 216 can be riveted to restrict the relative movement between the pole member 21 and the transition structure 22.

[0350] The pole body 21 can be a solid structure (as shown in Figures 53 and 55) or a hollow structure (as shown in Figure 54). For example, referring to Figure 54, when the pole body 21 is a hollow structure, it includes a first pole member 21a and a second pole member 21b. The second pole member 21b consists of a through portion 214, an inner limiting portion 215, and an outer limiting portion 216, and is mounted on the first shell wall 111. The through-hole 214 surrounds the first shell wall 111 and extends through the mating hole 21b1 in the inner and outer directions. The first electrode post 21a is assembled on the side of the second electrode post 21b away from the electrode component 3 and covers the mating hole 21b1, so as to form an open receiving space between the first electrode post 21a and the second electrode post 21b in the direction of the electrode component 3. A portion of the conductive part 4 can extend into the receiving space and connect to the first electrode post 21a, so that the electrode post body 21 can play the role of storing the conductive part 4, thereby reducing the space occupied by the conductive part 4 in the receiving cavity 13 and improving the energy density of the battery cell 102.

[0351] Referring again to Figure 53, in some embodiments of this application, the adapter structure 22 further includes a third insulating frame 228, which is connected to the side of the fourth adapter ring 227 facing the electrode component 3. Thus, the third insulating frame 228 can serve as insulation between the electrode component 3 and the fourth adapter ring 227, eliminating the need for a separate insulating structure. Exemplarily, the third insulating frame 228 has a pin, and the fourth adapter ring 227 has a socket; the pin is interference-fitted into the socket to connect the third insulating frame 228 and the fourth adapter ring 227.

[0352] Please refer to Figures 56 and 57. Figure 56 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; Figure 57 is a partial cross-sectional view of a battery cell provided in some embodiments of this application. The first shell wall 111 has a mounting hole 112, and a sealing ring 14 is provided around the mounting hole 112. The sealing ring 14 is clamped between the electrode post component 2 and the first shell wall 111. "Step S30a, setting the electrode post 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 mounting hole 112 with the electrode post component 2 connected to the electrode component 3 so that the sealing ring 14 is clamped between the electrode post component 2 and the first shell wall 111".

[0353] When the electrode post 2, connected to the electrode post 3, is placed over the mounting hole 112 so that the sealing ring 14 is sandwiched between the electrode post 2 and the first housing wall 111, the edge of the transition structure 22 overlaps one side of the first housing wall 111 in the wall thickness direction. Thus, by placing the transition structure 22 over one side of the first housing wall 111 in the wall thickness direction—that is, placing the transition structure 22 over the outside of the first housing wall 111 or over the inside of the first housing wall 111—it is convenient to assemble the transition structure 22 with the first housing wall 111. Therefore, the electrode post 2 has a simple structure, is easy to manufacture, and is easy to assemble and connect with the first housing wall 111.

[0354] For example, the adapter structure 22 is welded to the first shell wall 111. For instance, after the adapter structure 22 is placed over the first shell wall 111, the adapter structure 22 and the first shell wall 111 can be connected by welding, which facilitates processing and ensures a reliable connection 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 seam formed by the connection is exposed on the side of the first shell wall 111 away from the electrode component 3 (i.e., away from the active material coating portion 32), thereby facilitating welding operations and increasing the welding space.

[0355] The execution order of "step S34, installing the sealing ring 14 into the mounting hole 112 of the first shell wall 111" can be flexibly set. It can be set before or after the conductive part 4 or the electrode component 2 passes through the mounting hole 112. When the electrode component 2 needs to pass through the mounting hole (for example, as shown in Figure 23), the execution order of "step S20a, connecting the electrode component 3 to the electrode body 21" and "step S34, installing the sealing ring 14 into the mounting hole 112 of the first shell wall 111" is not limited. They can be performed one after the other or simultaneously.

[0356] Referring to Figure 10, in some embodiments, the phrase "step S35, covering the mounting hole 112 with the electrode post 2 connected to the electrode post 3 so that the sealing ring 14 is sandwiched between the electrode post 2 and the first housing wall 111" can specifically be: "step S311, covering the mounting hole 112 with the electrode post 2 connected to the conductive part 4 from the outside of the first housing wall 111 so that the adapter structure 22 abuts against the outside of the first housing wall 111". For example, referring to FIG10, when assembling the battery cell 102, the following steps can be performed sequentially: "Step S34, install the sealing ring 14 into the mounting hole 112 of the first housing wall 111"; "Step S211, place the electrode component 3 and the conductive part 4 connected to the electrode component 3 on the inner side of the first housing wall 111, and extend the conductive part 4 through the mounting hole 112 to the outer side of the first housing wall 111"; "Step S212, extend the conductive part 4 through the mounting hole 112 to the outer side of the first housing wall 111"; "Part 4 is connected to the pole body 21 of the pole member 2 located on the outside of the first shell wall 111"; "Step S311, the pole member 2 connected to the conductive part 4 is covered by the mounting hole 112 from the outside of the first shell wall 111 so that the adapter structure 22 abuts against the outside of the first shell wall 111", and the sealing ring 14 is sandwiched between the pole member 2 and the first shell wall 111; "Step S312, the adapter structure 22 is connected to the first shell wall 111 from the outside of the first shell wall 111".

[0357] Alternatively, referring to Figure 23, in some embodiments, the phrase "step S35, covering the mounting hole 112 with the pole member 2 connected to the electrode member 3 so that the sealing ring 14 is sandwiched between the pole member 2 and the first shell wall 111" can specifically be: "step S322, covering the mounting hole 112 with the pole member 2 that extends to the outside of the first shell wall 111 from the outside of the first shell wall 111 so that the transition structure 22 abuts against the outside of the first shell wall 111." For example, referring to FIG23, when assembling the battery cell 102, the following steps can be performed sequentially: "Step S20a, connect the electrode component 3 to the terminal body 21"; "Step S34, install the sealing ring 14 at the mounting hole 112 of the first shell wall 111"; "Step S321, pass the terminal component 2 connected to the electrode component 3 from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111"; "Step S322, cover the mounting hole 112 with the terminal component 2 that has passed to the outside of the first shell wall 111 from the outside of the first shell wall 111, so that the adapter structure 22 abuts against the outside of the first shell wall 111", and the sealing ring 14 is sandwiched between the terminal 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".

[0358] Alternatively, in some embodiments, the phrase "the pole member 2 connected to the electrode member 3 is covered in the mounting hole 112 in step S35, so that the sealing ring 14 is sandwiched between the pole member 2 and the first shell wall 111" can be specifically described as: "Step S332, the pole member 2 connected to the electrode member 3 is covered in the mounting hole 112 from the inside of the first shell wall 111 so that the adapter structure 22 abuts against the inside of the first shell wall 111".

[0359] In some embodiments of this application, referring to Figures 4 and 5, the transition structure 22 is formed as an elongated strip (e.g., rectangular, elliptical, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111, and the pole body 21 is located at the center of the length of the transition structure 22 and is circular. Therefore, when the pole body 21 is located at the center of the length of the elongated 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 to ensure that the connection force between the pole body 21 and the transition structure 22 is evenly distributed on the circumference, improving the uniformity of the force 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.

[0360] In other embodiments of this application, referring to Figures 39 and 40, the adapter structure 22 is formed as an elongated strip (e.g., rectangular, elliptical, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111, and the outline shape of the electrode body 21 matches the outline shape of the adapter structure 22 (e.g., rectangular, elliptical, racetrack-shaped, etc.). The electrode component 3 is connected to the electrode component 2 via the conductive part 4. When the outline shape of the electrode body 21 is formed as an elongated strip matching the outline shape of the adapter structure 22, the area of ​​the electrode body 21 is larger, which is beneficial to increasing the connection area between the conductive part 4 and the electrode body 21, thereby improving charging performance.

[0361] In some embodiments of this application, referring to FIG58, FIG58 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; before "step S20a, connecting the electrode component 3 to the terminal body 21", the method further includes: step S53, providing the terminal body 21 and the adapter structure 22; step S54, assembling the terminal component 2. That is, the terminal body 21 and the adapter structure 22 of the desired shape are provided, and then the terminal body 21, the adapter structure 22 and the insulation structure 23 are assembled together to obtain the terminal component 2.

[0362] For example, when the insulating structure 23 includes the sealing structure 231, "step S50, providing the pole component 2" may include: step S53, providing the pole body 21 and the transition structure 22; step S54, assembling the pole component 2. Specifically, "step S54, assembling the pole component 2" may 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 be specifically "step S52, assembling or shaping the pole body 21 to complete the clamping of the sealing structure 231 by the mating ring portion 2271 and the pole body 21".

[0363] For example, in "step S311, the electrode post 2 connected to the conductive part 4 is covered from the outside of the first shell wall 111 to the mounting hole 112, so that the adapter structure 22 abuts against the outside of the first shell wall 111"; "step S312, the adapter structure 22 is connected to the first shell wall 111 from the outside of the first shell wall 111", and in "step S321, the electrode post 2 connected to the electrode part 3 is passed from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111"; "step S322, the electrode post 2 that has passed to the outside of the first shell wall 111 is covered from the outside of the first shell wall 111 to the mounting hole 112, so that the adapter structure 22 abuts against the outside of the first shell wall 111"; "step S323 In the connection structure 22 connecting the first shell wall 111 from the outside, the edges of the connection structure 22 can overlap the side of the first shell wall 111 away from the electrode component 3. For example, referring to Figures 11A-11D and 30A-30D, a first recess 1111 surrounding the mounting hole 112 can be provided on the first shell wall 111. The first recess 1111 opens towards the direction away from the electrode component 3 (i.e., it opens towards the direction away from the active material coating portion 32). The edges of the connection structure 22 are embedded in the first recess 1111, and each edge of the connection structure 22 has a flange portion 22a surrounding the connection structure 22, which is embedded in the first recess 1111. This facilitates the support and positioning of the connection between the connection structure 22 and the first shell wall 111, and allows for welding the two together from the outside of the first shell wall 111 (i.e., the side away from the active material coating portion 32).

[0364] For example, 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 and the groove depth of the first groove 1111 are substantially the same. This facilitates welding of 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, reducing unnecessary space occupation, and the thickness of the flange portion 22a is not too small relative to the groove depth of the first groove 1111, thus meeting welding strength requirements.

[0365] For example, in "step S331, placing both the electrode post 2 connected to the electrode component 3 and the electrode component 3 inside the first shell wall 111"; "step S332, covering the mounting hole 112 from the inside of the first shell wall 111 with the electrode post 2 connected to the electrode component 3, so that the adapter structure 22 abuts against the inside of the first shell wall 111"; "step S333, connecting the adapter structure 22 to the first shell wall 111 from the outside 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 Figures 34A-32D again. The edge of the adapter structure 22 has a second recess 22b that opens in the direction away from the electrode component 3 (that is, the second recess 22b opens in the direction away from the active material coating part 32). The first shell wall 111 includes an overlapping part 1112 protruding into the mounting hole 112, and the overlapping part 1112 is embedded in the second recess 22b. This facilitates the support and positioning of the connection between the electrode post 2 and the first shell wall 111, and makes it easier for the two to be welded together from the outside of the first shell wall 111 (i.e., the side away from the active material coating part 32).

[0366] For example, the thickness of the overlapping portion 1112 matches the groove depth T2 of the second sinker 22b, where "matching" means that the thickness of the overlapping portion 1112 and the groove depth of the second sinker 22b are substantially the same. This facilitates welding the overlapping portion 1112 to the first shell wall 111. The thickness of the overlapping portion 1112 is not too large relative to the groove depth of the second sinker 22b, reducing unnecessary space occupation, and the thickness of the overlapping portion 1112 is not too small relative to the groove depth of the second sinker 22b, thus meeting the welding strength requirements.

[0367] In other embodiments of this application, please refer to Figures 59, 60A-60D. Figure 59 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; Figures 60A-60D are exploded views of the assembly process of a battery cell provided in one embodiment of this application. The terminal body 21 includes a first terminal member 21a and a second terminal member 21b. The second terminal member 21b is installed on the first shell wall 111, and the first terminal member 21a is installed on the second terminal member 21b. The electrode component 3 is connected to the first terminal member 21a. "Step S20, connecting the electrode component 3 to the terminal member 2" specifically includes: "Step S20b, connecting the electrode component 3 to the first terminal member 21a"; "Step S30, installing the terminal member 2 connected to the electrode component 3 to the first shell wall 111" specifically includes: "Step S30b, assembling the first terminal member 21a connected to the electrode component 3 to the second terminal member 21b installed on the first shell wall 111".

[0368] In the above technical solution, by dividing the electrode body 21 into two parts for assembly and connection, when assembling the battery cell, the first electrode 21a can be connected to the electrode component 3 first, and the second electrode 21b can be connected to the first shell wall 111 first, and then the first electrode 21a and the second electrode 21b can be connected. This helps to shorten the conductive part 4, reduce the redundancy of the conductive part 4 and the material cost.

[0369] Please refer again to Figure 60 and in conjunction with Figure 61. Figure 61 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, the second electrode post 21b defines a mating hole 21b1, and the first electrode post 21a covers the side of the second electrode post 21b away from the electrode component 3 and seals the mating hole 21b1. "Step S30b, assembling the first electrode post 21a connected to the electrode component 3 to the second electrode post 21b installed on the first housing wall 111" may specifically include: "Step S30b21, covering the mating hole 21b1 from the outside of the second electrode post 21b with the first electrode post 21a connected to the electrode component 3", and "Step S30b22, connecting the first electrode post 21a from the outside of the first housing wall 111 to the second electrode post 21b".

[0370] In the above technical solution, by setting the mating hole 21b1, the first pole piece 21a and the second pole piece 21b can be connected from the outside of the pole piece 2, which is beneficial to improving the connection convenience and connection reliability of the first pole piece 21a and the second pole piece 21b.

[0371] Please refer again to Figure 60 and in conjunction with Figure 62. Figure 62 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, "step S20b, connecting the electrode component 3 with the first electrode post 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 mating hole 21b1 to the outer side of the second electrode post 21b"; "step S20b12, connecting the conductive part 4 that passes through the outer side of the first shell wall 111 with the first electrode post 21a placed on the outer side of the first shell wall 111".

[0372] That is, when processing the above-mentioned battery cell 102, the following steps can be performed sequentially: Step S20b11, placing the electrode component 3 and the conductive part 4 inside the first shell wall 111, and passing the conductive part 4 through the mating hole 21b1 to the outside of the second electrode post 21b; Step S20b12, connecting the conductive part 4 that passes through the outside of the first shell wall 111 to the first electrode post 21a placed on the outside of the first shell wall 111; Step S30b21, covering the mating hole 21b1 with the first electrode post 21a connected to the electrode component 3 from the outside of the second electrode post 21b; Step S30b22, connecting the first electrode post 21a from the outside of the first shell wall 111 to the second electrode post 21b.

[0373] In the above technical solution, since the conductive part 4 is not yet connected to the first electrode post 21a when it passes through the mating hole 21b1, it is convenient for the conductive part 4 to pass through the mating hole 21b1, thus improving the ease of operation. Moreover, since the welding position between the first electrode post 21a and the conductive part 4 is located on the outside of the first shell wall 111, the problem of conductive debris formed during the welding process entering the interior of the shell 11 and damaging the electrode component 3 can be improved.

[0374] In the above embodiments, the first shell wall 111 can be either the shell cover 12 or a part of the shell body 11. The specific assembly sequence can be referred to the above description. For example, when the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, the settings of steps S2111 and S2112 corresponding to FIG17 can be referred to. As another example, when the shell cover 12 is the first shell wall 111, the settings of steps S41, S42, S43, and S44 corresponding to FIG19-FIG21 can be referred to.

[0375] Please refer to Figures 63 and 64A-64D. Figure 63 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; Figures 64A-64D are exploded views of the assembly process of a battery cell provided in one embodiment of this application; in some embodiments of this application, before "step S30b21, covering the mating hole 21b1 with the first electrode post 21a connected to the electrode component 3 from the outside of the second electrode post 21b", the method further includes: "step S30b11, placing the electrode component 3 and the first electrode post 21a connected to the electrode component 3 inside the first shell wall 111"; "step S30b12, passing the first electrode post 21a through the mating hole 21b1 to the outside of the second electrode post 21b".

[0376] That is, when processing the above-mentioned battery cell 102, the following steps can be performed sequentially: Step S20b, connecting the electrode component 3 to the first terminal 21a; Step S30b11, placing the electrode component 3 and the first terminal 21a connected to the electrode component 3 inside the first shell wall 111; Step S30b12, passing the first terminal 21a through the mating hole 21b1 to the outside of the second terminal 21b; Step S30b21, covering the mating hole 21b1 with the first terminal 21a connected to the electrode component 3 from the outside of the second terminal 21b; Step S30b22, connecting the first terminal 21a from the outside of the first shell wall 111 to the second terminal 21b.

[0377] In the above technical solution, since the electrode component 3 is connected to the first terminal post 21a first, and then the first terminal post 21a is passed through the mating hole 21b1, there is no need to consider avoiding the first shell wall 111 when connecting the electrode component 3 and the first terminal post 21a. In other words, when connecting the electrode component 3 and the first terminal post 21a, the second terminal post 21b and the electrode component 3 are not located on opposite sides of the first shell wall 111. This helps to further shorten the length of the conductive part 4, reduce the redundancy of the conductive part 4 after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell 102. Moreover, since the welding position of the electrode component 3 and the first terminal post 21a is located on the outside of the shell 11, the problem of conductive debris formed during the welding process entering the interior of the shell 11 and damaging the electrode component 3 can be improved.

[0378] In the above embodiments, the first shell wall 111 can be either the shell cover 12 or a part of the shell body 11. The specific assembly sequence can be referred to the above description. For example, when the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, the settings of steps S3211 and S3212 corresponding to FIG. 29 can be referred to. As another example, when the shell cover 12 is the first shell wall 111, the settings of steps S43 and S44 corresponding to FIG. 32 and 33 can be referred to.

[0379] The execution order of "installing the second electrode post 21b onto the first housing wall 111" can be flexibly set. It can be set before or after the conductive part 4 or the first electrode post 21a through the mating hole 21b1. When the first electrode post 21a needs to pass through the mating hole 21b1 (for example, as shown in Figure 64), the execution order of "connecting the electrode component 3 to the first electrode post 21a" and "installing the second electrode post 21b onto the first housing wall 111" is not limited; they can be performed one after the other or simultaneously.

[0380] Referring again to Figure 60, the first shell wall 111 has a mounting hole 112. The second pole piece 21b passes through the mounting hole 112 and is 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. Therefore, the connection between the second pole piece 21b and the first shell wall 111 is relatively reliable. Furthermore, by providing the insulating sealing component 24, the connection between the second pole piece 21b and the first shell wall 111 is both insulated and sealed. The second pole piece 21b can be made of metal, which helps to increase the conductive area of ​​the pole body 21. For example, the second pole piece 21b can be riveted to the first shell wall 111, thereby eliminating the welding process, improving processing efficiency, and avoiding the impact of welding heat on the insulating sealing component 24. The composition of the insulating sealing component 24 is not limited; for example, it can be a single part or composed of multiple parts, such as elastic rubber parts, plastic parts, etc. In other embodiments of this application, the second pole piece 21b may be configured as a multi-part welded assembly, or the second pole piece 21b may be made of a non-metallic material and connected to the first shell wall 111 by means of bonding, injection molding, etc.

[0381] Please refer to Figures 65 and 66A-66C. Figure 65 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; Figures 66A-66C are exploded views of the processing of an electrode component provided in one embodiment of this application. In some embodiments of this application, the tab 33 of the electrode component 3 includes a gathered portion 313 formed by stacking and connecting multiple layers of tabs 311. The tab 33 is connected to the terminal component 2 through the gathered portion 313, so that the conductive part 4 only includes the tab 33, and the tab 33 is directly connected to the terminal component 2. At this time, before "step S20, connecting the electrode component 3 to the terminal component 2", it may also include: step S14 stacking and connecting multiple layers of tabs 311 in the tab 33 of the electrode component 3 to form the gathered portion 313.

[0382] When the tab 33 is directly connected to the pole member 2 via the retracting portion 313, the assembly sequence for any of the above embodiments is suitable, for example, as shown in Figures 10A-10D (the conductive portion 4 of the electrode member 3 first passes through the mounting hole 112, the conductive portion 4 is welded to the pole member 2 outside the mounting hole 112, and the pole member 2 then covers the mounting hole 112 from the outside of the first shell wall 111), or as shown in Figures 23A-23D (the electrode member 3 and the pole member 2 are first welded, the pole member 2 passes through the mounting hole 112, and then the mounting hole 112 is covered from the outside of the first shell wall 111), or as shown in Figures 34A-34D (the electrode member 3 and the pole member 2 are first welded, the pole member 2 does not pass through the mounting hole 112, and the mounting hole 112 is covered from the inside of the first shell wall 111).

[0383] Exemplarily, the electrode component 3 includes one or more electrode assemblies 31. Each electrode assembly 31 has a positive electrode tab 311 and a negative electrode tab 311. Multiple layers of tabs 311 of the same polarity are stacked and brought together to form a stacked portion 312. The multiple layers of tabs 311 in the stacked portion 312 are connected to form a gathered portion 313. The multiple layers of tabs 311 in the gathered portion 313 are electrically conductive; that is, the multiple layers of tabs 311 in the gathered portion 313 not only have a stacked arrangement but are also connected and conductive. The connection method of the multiple layers of 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 welding, or brazing, or through-hole connection, or bonding with conductive adhesive. Exemplarily, the multiple layers of tabs 311 of the same polarity can be ultrasonically welded, and the resulting ultrasonic weld mark is the gathered portion 313.

[0384] The multiple layers of tabs 311 in the gathering portion 313 can belong to the same electrode assembly 31 or to different electrode assemblies 31. That is, several layers of tabs 311 of the same polarity in the same electrode assembly 31 can be connected to form the gathering portion 313, or several layers of tabs 311 of the same polarity in different electrode assemblies 31 can be connected to form the gathering portion 313. For example, all the tabs 311 of the same polarity in the electrode component 3 can be connected to form the gathering portion 313, which can reduce the number of gathering portions 313.

[0385] Therefore, by connecting multiple layers of tabs 311 in the tab portion 33 to form a gathered portion 313, the gathered portion 313 can present a plate shape with multiple layers of tabs 311 connected together and having a certain rigidity, rather than a loose and scattered multi-layer foil shape. This facilitates the perforation operation of the tab portion 33, such as the operation of passing the tab portion 33 through the mounting hole 112 or mating hole 21b1, improving processing efficiency. On the other hand, it makes the welding of the gathered portion 313 and the pole piece 2 (such as the pole piece body 21 or the first pole piece 21a) more reliable, and it is not easy for pores to form in the weld. This can improve the connection reliability and conductivity of the weld, making the conductivity of the electrode piece 3 and the pole piece 2 more stable and reliable.

[0386] Please refer again to Figures 66A-66C, and in conjunction with Figures 67 and 68, which are flowcharts of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments, when the electrode component 3 includes multiple electrode assemblies 31, "step S14 connects the multilayer tabs 311 in the tab portion 33 of the electrode component 3 to form a closing portion 313" may specifically include: step S141 stacking multiple electrode assemblies 31 along the thickness direction of the electrode assembly 31; step S142 connecting the multilayer tabs 311 of at least two electrode assemblies 31 to form a closing portion 313. Wherein, since multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31, the stacking direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in Figure 66A) is consistent with the thickness direction of the electrode assembly 31.

[0387] In the above technical solution, before connecting the electrode component 3 and the electrode post component 2, multiple electrode components 31 are stacked first, and several tabs 311 of the same polarity of multiple electrode components 31 are connected together to form a gathering part 313. Compared with the technical solution of connecting the tabs 311 of each electrode component 31 separately to form a gathering part 313, connecting the gathering part 313 of each electrode component 31 separately to the electrode post component 2, and then stacking multiple electrode components 31, on the one hand, the total number of gathering parts 313 can be reduced, the connection steps between the gathering part 313 and the electrode post body 21 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 tab 33 and the active material coating part 32 caused by the asynchronous movement of the tabs 311 of different electrode components 31 when the gathering part 313 is manufactured first and then the electrode components 31 are stacked.

[0388] When the electrode component 3 includes a gathered portion 313 formed by connecting multiple layers of tabs 311 (regardless of whether steps S141 and S142 are performed beforehand, i.e., the multiple layers of tabs 311 in the gathered portion 313 can belong to one electrode assembly 31 or multiple electrode assemblies 31 simultaneously), please refer to FIG68, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; in some embodiments of this application, "step S20, connecting the electrode component 3 to the electrode post component 2" may specifically include: step S243, laying the gathered portion 313 on the inner end face 211 of the electrode post body 21; step S244, connecting the gathered portion 313 to the inner end face 211 of the electrode post body 21. The surface of the electrode post body 21 facing the electrode component 3 (i.e., facing the active material coating portion 32) is the inner end face 211 of the electrode post body 21.

[0389] In the above technical solution, by laying the folding part 313 on the inner end face 211 of the pole body 21, the folding part 313 is laid flat and flat. At least part of the folding part 313 falls on the inner end face 211 of the pole body 21, so that the tab part 33 will not be damaged due to bending of the folding part 313, thus improving the charging performance. It also facilitates the setting of the welding nozzle and improves the connection reliability between the folding part 313 and the pole body 21.

[0390] For example, referring again to Figures 39 and 40, when the inner end face 211 of the pole body 21 is large, for example, when the inner end face 211 of the pole body 21 is long and narrow, such as rectangular, elliptical, racetrack-shaped, etc., the gathering part 313 can be completely laid flat on the inner end face 211 of the pole body 21. Alternatively, as exemplarily, please refer to Figure 47. When the inner end face 211 of the pole body 21 is small, the position of the inner end face 220 of the adapter structure 22 adjacent to the pole body 21 is the surrounding area 2201 of the pole body 21. The surrounding area 2201 can be set to be flush with the inner end face 211 of the pole body 21. At this time, a part of the gathering part 313 can be laid flat on the inner end face 211 of the pole body 21, and the rest can be laid flat on the surrounding area 2201, so that the gathering part 313 (for example, the gathering part 313 is also long strip) can be supported as a whole, which is convenient for the welding nozzle to be pressed, so that the gathering part 313 can be reliably connected to the pole body 21.

[0391] In some embodiments of this application, referring again to FIG6, the electrode post 2 forms a receiving groove 5 that is recessed relative to the first shell wall 111 in a direction away from the electrode post 3 and open in a direction towards the electrode post 3. The electrode post 3 is connected to the electrode post 2 via a conductive part 4, at least a portion of which is accommodated in the receiving groove 5 and connected to the electrode post body 21. That is, the electrode post 2 forms the receiving groove 5, the groove wall of the receiving groove 5 is formed by the electrode post 2, the receiving groove 5 is recessed in a direction away from the active material coating part 32, and the receiving groove 5 is open in a direction towards the active material coating part 32, so that the receiving groove 5 communicates with the receiving cavity 13.

[0392] Therefore, by providing a receiving groove 5 to accommodate the conductive part 4, the space occupied by the conductive part 4 in the receiving cavity 13 can be reduced, allowing the receiving cavity 13 to have a larger space to accommodate the active material coating part 32. This is beneficial for increasing 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 towards the electrode component 13, the conductive part 4 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0393] For example, please refer to FIG6 again. When the electrode post component 2 is constructed in any of the above embodiments including the electrode post body 21 and the adapter structure 22, the receiving groove 5 is formed on the side of the electrode post body 21 and the adapter structure 22 facing the electrode component 3 (i.e., the side facing the active material coating portion 32). The adapter structure 22 may protrude 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.

[0394] Therefore, by processing the adapter structure 22 into an outwardly protruding shape, a portion of the receiving groove 5 is formed on the side of the pole body 21 facing the electrode component 3, and another portion of the receiving groove 5 is formed on the side of the adapter structure 22 facing the electrode component 3. The receiving groove 5 has a shape that is concave relative to the first shell wall 111 in the direction away from the electrode component 3. Thus, both 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 have space to accommodate the conductive part 4. This not only facilitates the storage of the conductive part 4 to a greater extent, but also facilitates the design of diverse forms of the conductive part 4.

[0395] In other embodiments of this application, referring to FIG10, when the adapter structure 22 does not bulge relative to the first shell wall 111 in a direction away from the electrode component 3 (i.e., away from the active material coating portion 32), the receiving groove 5, which is recessed relative to the first shell wall 111 in a direction away from the electrode component 3, can also be defined by the height difference between the adapter structure 22 and the electrode post body 21. Alternatively, referring to FIG54, the receiving groove 5 can also be defined by the first electrode post 21a and the second electrode post 21b.

[0396] In some embodiments of this application, referring again to FIG6, the surface of the end of the electrode body 21 facing the electrode component 3 is the inner end face 211 of the electrode body 21. The inner end face 211 of the electrode body 21 forms the receiving groove 5, and the conductive part 4 is connected to the inner end face 211 of the electrode body 21. That is, at least a portion of the inner end face 211 of the electrode body 21 defines the groove wall of the receiving groove 5, and the conductive part 4 is connected to the portion of the inner end face 211 of the electrode 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 formed by the side surface of the electrode body 21 facing the electrode component 3, and the conductive part 4 housed in the receiving groove 5 can easily contact and connect to the electrode body 21, improving connection convenience and simplifying the structure. For example, referring to Figure 54, when the electrode body 21 includes a first electrode member 21a and a second electrode member 21b, the surface of the first electrode member 21a facing the electrode component 3 is the inner end face 211 of the electrode body 21.

[0397] Please refer again to Figures 39-40, and in conjunction with Figure 69. Figure 69 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. When the terminal post component 2 forms a receiving groove 5 that is recessed relative to the first shell wall 111 in the direction away from the electrode component 3 and open in the direction towards the electrode component 3, in some embodiments of this application, before "step S243 laying the gathering part 313 on the inner end face 211 of the terminal post body 21", the following step may be included: step S242, inserting the gathering part 313 into the receiving groove 5.

[0398] Therefore, by providing a receiving groove 5 to accommodate the gathering part 313, the space occupied by the tab part 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 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.

[0399] Please refer again to Figures 23A-23D, and in conjunction with Figure 70. Figure 70 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. When the electrode component 3 includes multiple electrode assemblies 31 stacked together, in some embodiments of this application, before "step S243 laying the gathering portion 313 on the inner end face 211 of the electrode post body 21", the following steps may be included: step S2411, setting the electrode post component 2 on one side of the protruding tab portion 33 of the electrode component 3; step S2412, adjusting the angle of the electrode post component 2 so that the normal of the inner end face 211 of the electrode post body 21 is close to the stacking direction of the multiple electrode assemblies 31 (e.g., the fourth direction F4 shown in Figure 23B). In this embodiment, the stacking step of the electrode assembly 31 can be performed before the gathering part 313 is connected to the pole member 2, or after the gathering part 313 is connected to the pole member 2. That is, the gathering part 313 can be formed by stacking and connecting the multilayer tabs 311 of at least two electrode assemblies 31, or it can be formed by stacking and connecting the multilayer tabs 311 of only one electrode assembly 31.

[0400] The phrase "the normal of the inner end face 211 of the electrode post body 21 is close to the stacking direction of the multiple electrode components 31" means that the normal of the inner end face 211 of the electrode post body 21 is consistent with or substantially consistent with the stacking direction of the multiple electrode components 31. "Substantially consistent" can be understood as a small angle between them, for example, less than 10°. The phrase "setting the electrode post component 2 on one side of the protruding tab 33 of the electrode component 3" can be understood as: the tab 33 is located on one side of the active material coating portion 32. Setting the electrode post component 2 and the tab 33 on the same side of the active material coating portion 32 helps to shorten the length of the tab 33. In the above technical solution, the "length of the tab 33" ensures that when the normal of the inner end face 211 of the electrode post body 21 is close to the stacking direction of the multiple electrode components 31, the electrode post component 2 can be located on one side of the protruding tab 33 of the electrode component 3, and the closing portion 313 can be laid on the inner end face 211 of the electrode post body 21.

[0401] In the above technical solution, by first adjusting the position and angle of the pole piece 2 so that the normal of the inner end face 211 of the pole piece body 21 is close to the stacking direction of the multiple electrode components 31, and then laying the gathering part 313 on the inner end face 211 of the pole piece body 21, there is no need to adjust the angle of the pole piece body 21. This allows sufficient space near the mating position of the gathering part 313 and the inner end face 211 of the pole piece body 21 for welding operations, thereby simplifying the operation. Moreover, this allows the length of the electrode tab 33 to be shorter.

[0402] Please refer again to Figures 23A-23D and in conjunction with Figure 70. For example, when the electrode post component 2 has a receiving groove 5, you can first execute "step S2411 setting the electrode post component 2 on one side of the protruding electrode tab 33 of the electrode component 3; step S2412 adjusting the angle of the electrode post component 2 so that the normal of the inner end face is close to the stacking direction of the multiple electrode assemblies 31", and then execute "step S242 inserting the gathering part 313 into the receiving groove 5". In this way, after the gathering part 313 is inserted into the receiving groove 5 and laid on the inner end face 211 of the electrode post body 21, there is no need to adjust the angle of the electrode post body 21. This allows sufficient space near the mating position of the gathering part 313 and the inner end face 211 of the electrode post body 21 for welding operations, thereby simplifying the operation.

[0403] Please refer again to Figure 6 and in conjunction with Figure 71. Figure 71 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, the terminal component 2 includes a terminal body 21, and the electrode component 3 is connected to the terminal body 21 through a conductive part 4. The conductive part 4 includes a tab 33 composed of tabs 311 of the electrode component 3, and a conductive element 41 connected to the tab 33. The tab 33 is connected to the terminal body 21 through the conductive element 41. "Step S20 connects the electrode component 3 to the terminal component 2" specifically includes: step S251, connecting the tab 33 to the conductive element 41. The connection method between the tab 33 and the conductive element 41 is not limited. For example, it can be welding such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure welding, or brazing, or through-hole connection, or bonding with conductive adhesive, etc.

[0404] Therefore, by connecting the tab 33 and the pole body 21 through the conductive element 41, the length of the tab 33 can be shortened, and problems such as wrinkling, bending and breakage of the tab 311 can be improved. Furthermore, by flexibly designing the shape and material of the conductive element 41, the connection difficulty with the pole body 21 can be reduced, and the connection convenience between the conductive element 41 and the pole body 21 can be improved.

[0405] When the tab 33 is indirectly connected to the electrode body 21 via the conductive member 41, the assembly sequence for any of the above embodiments is suitable, for example, as shown in Figures 12A-12E (the conductive part 4 of the electrode component 3 first passes through the mounting hole 112, the conductive part 4 is welded to the electrode component 2 outside the mounting hole 112, and the electrode component 2 then covers the mounting hole 112 from the outside of the first shell wall 111), or as shown in Figures 24A-24D (the electrode component 3 and the electrode component 2 are first welded, the electrode component 2 passes through the mounting hole 112, and then the mounting hole 112 is covered from the outside of the first shell wall 111), or the electrode component 3 and the electrode component 2 are first welded, the electrode component 2 does not pass through the mounting hole 112, and the mounting hole 112 is covered from the inside of the first shell wall 111).

[0406] Please refer again to Figures 66A-66C, and in conjunction with Figures 72 and 73, which are flowcharts of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments, when the electrode component 3 includes multiple electrode assemblies 31, before "step S251 connecting the tab 33 to the conductive member 41", the method further includes: step S151 stacking multiple electrode assemblies 31 along the thickness direction of the electrode assembly 31; step S152 stacking and aggregating the multilayer tabs 311 of at least two electrode assemblies 31 to form a stacked portion 312. Since multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31, the stacking direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in Figure 66A) is consistent with the thickness direction of the electrode assembly 31.

[0407] In the above technical solution, before connecting the tab 33 to the conductive element 41, multiple electrode assemblies 31 are stacked first, and several tabs 311 of the same polarity of multiple electrode assemblies 31 are gathered together to form a stacked portion 312. Compared with the technical solution of gathering the tabs 311 of each electrode assembly 31 separately to form a stacked portion 312, connecting the stacked portion 312 of each electrode assembly 31 to the conductive element 41 separately, and then stacking multiple electrode assemblies 31, on the one hand, it can reduce the total number of stacked portions 312 and conductive elements 41, reduce the connection steps between the stacked portions 312 and the conductive element 41, and improve processing efficiency. On the other hand, it can avoid the problem of cracking at the connection position between the tab 33 and the active material coating portion 32 due to the asynchronous movement of the tabs 311 of different electrode assemblies 31 when connecting the stacked portion 312 to the conductive element 41 first and then stacking the electrode assemblies 31.

[0408] When the tab portion 33 of the electrode component 3 includes a stacked portion 312 formed by stacking and gathering multiple tabs 311 (regardless of whether steps S151 and S152 are performed beforehand, i.e., the multiple tabs 311 in the gathering portion 313 can belong to one electrode assembly 31 or multiple electrode assemblies 31 simultaneously), please refer to FIG73, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; in some embodiments of this application, before "step S251 connects the tab portion 33 to the conductive member 41", the method further includes: step S153 connecting the multiple tabs 311 in the stacked portion 312 to form the gathering portion 313. Thus, the tab portion 33 can be connected to the conductive member 41 through the gathering portion 313.

[0409] The multilayer tabs 311 in the gathering portion 313 are electrically conductive, meaning that the multilayer tabs 311 in the gathering portion 313 not only have a stacked arrangement but are also connected and conductive. The connection method of the multilayer tabs 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 welding, or brazing, or through-hole connection, or bonding with conductive adhesive, etc. For example, multilayer tabs 311 of the same polarity can be ultrasonically welded, and the resulting ultrasonic weld mark constitutes the gathering portion 313.

[0410] Therefore, by pre-connecting the multiple layers of tabs 311 in the stacked portion 312 to form a gathered portion 313, the gathered portion 313 can present a plate shape with multiple layers of tabs 311 connected together and having a certain rigidity, rather than a loose and scattered multi-layer foil shape. This facilitates the connection between the tab portion 33 and the conductive component 41, and makes the welding between the tab portion 33 and the conductive component 41 more reliable. It is not easy for pores to form in the weld, which can improve the connection reliability and conductivity of the weld, and make the conductivity between the electrode component 3 and the pole component 2 more stable and reliable.

[0411] Please refer again to Figures 13A-13E, and in conjunction with Figure 74, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, the conductive component 41 includes a first connecting segment 411. The step "connecting the tab 33 to the conductive component 41 in step S251" may specifically include: step S251011 stacking the gathering portion 313 on one side of the thickness direction of the first connecting segment 411; step S251012 connecting the gathering portion 313 to the first connecting segment 411. The conductive component 41 has a first connecting segment 411, which is aligned with the thickness direction of the gathering portion 313. The two are stacked and connected (e.g., by welding) along the thickness direction of the first connecting segment 411, thus simplifying the connection between the gathering portion 313 and the conductive component 41 and improving production efficiency.

[0412] Please refer again to Figures 12A-12E and Figure 75. Figure 75 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, the conductive member 41 has a first connecting section 411, which includes two clamping portions 4110. The tab end 331 of the tab 33 (such as the gathering portion 313 or the stacked portion 312) is clamped between the two clamping portions 4110. The step "connecting the tab 33 to the conductive member 41 in step S251" specifically includes: step S251021 clamping the tab end 331 (such as the gathering portion 313 or the stacked portion 312) of the tab 33 between the two clamping portions 4110; step S251022 connecting the tab end 331 (such as the gathering portion 313 or the stacked portion 312) of the tab 33 to the two clamping portions 4110 as a whole.

[0413] Therefore, the two clamping portions 4110 can be used to limit the electrode tab 33, improving the connection reliability of the multi-layer electrode tabs 311 in the electrode tab 33. In some examples, by providing two clamping portions 4110, the electrode tab 33 clamped between the two clamping portions 4110 can be in the state of a stacked portion 312, thus eliminating the step of connecting the multi-layer electrode tabs 311 in the stacked portion 312 to form a gathered portion 313, thereby simplifying the processing steps and improving processing efficiency. Alternatively, the multi-layer electrode tabs 311 in the stacked portion 312 can be connected to form a gathered portion 313 first, and then the gathered portion 313 can be clamped between the two clamping portions 4110 and connected to the clamping portions 4110. This can reduce the porosity at the connection between the conductive element 41 and the electrode tab 33, improving the current carrying capacity and connection reliability.

[0414] Please refer again to Figures 76 and 77. Figure 76 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application, and Figure 77 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, after "step S251 connecting the tab 33 to the conductive member 41", the method may further include: step S252, adjusting the angle of the electrode post 2 so that the inner end face 211 of the electrode post body 21 faces the electrode post 3 (i.e., faces the active material coating part 32), and the first connecting segment 411 of the conductive member 41 is supported on the side of the tab 33 away from the electrode post body 211.

[0415] The phrase “the first connecting segment 411 of the conductive element 41 is supported on the side of the tab 33 away from the pole body 211” means that at least a portion of the first connecting segment 411 is supported on the side of the portion of the tab 33 connected to the first connecting segment 411 that is away from the inner end face 211 of the pole body 21.

[0416] For example, please refer again to Figures 13A-13E and in conjunction with Figure 76. After “step S251011 stacking the gathering part 313 on one side in the direction of the thickness of the first connecting section 411; step S251012 connecting the gathering part 313 to the first connecting section 411”, step S252 can specifically be: the angle of the pole member 2 can be adjusted so that the inner end face 211 of the pole body 21 faces the electrode member 3, and the first connecting section 411 of the conductive member 41 is supported on the side of the gathering part 313 away from the inner end face 211 of the pole body 21.

[0417] For example, please refer again to Figures 12A-12E and in conjunction with Figure 77. After “step S251021 clamps the tab end 331 (such as the gathering part 313 or the stacked part 312) of the tab 33 between the two clamping parts 4110; step S251022 connects the tab end 331 (such as the gathering part 313 or the stacked part 312) of the tab 33 to the two clamping parts 4110 into one piece”, step S252 can specifically be: the angle of the pole member 2 can be adjusted so that the inner end face 211 of the pole body 21 faces the electrode member 3, and one clamping part 4110 of the first connecting section 411 of the conductive member 41 is supported on the side of the tab end 331 (such as the gathering part 313 or the stacked part 312) away from the inner end face 211 of the pole body 21.

[0418] In the above technical solution, the support of the tab 33 by the first connecting section 411 of the conductive component 41 can improve the redundancy of the tab 33 and reduce the risk of short circuit caused by the tab 33 being inserted into the active material coating part 32. Moreover, the bent conductive component 41 can play a buffer support role, reducing the risk of the electrode component 3 hitting the first shell wall 111 and improving the reliability of the battery cell 102.

[0419] Please refer again to Figures 12A-12E, and in conjunction with Figure 78, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, "step S20, connecting the electrode component 3 with the terminal component 2" may further include: step S253, connecting the conductive component 41 with the terminal body 21. That is to say, the conductive component 41 and the terminal body 21 are separate components but are assembled and connected, thereby allowing for flexible design and processing of the conductive component 41 and the terminal body 21, improving the diversity of the battery cell 102.

[0420] The connection method between the conductive element 41 and the electrode body 21 is not limited. For example, it can be welding, such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure welding, or brazing, or through-hole connection, or bonding with conductive adhesive. Of course, this application is not limited to this. For example, in some other embodiments of this application, such as in conjunction with Figures 13A-13E, the conductive element 41 and the electrode body 21 can also be integrated into one piece without the need for a separate assembly and connection process.

[0421] Please refer again to Figures 12A-12E, and in conjunction with Figure 79. Figure 79 is a flowchart of the assembly method of the battery cell 102 provided in some embodiments of this application. In some embodiments of this application, the conductive element 41 includes a second connecting segment 412. The step "connecting the conductive element 41 to the electrode body 21 in step S253" specifically includes: step S2534 laying the second connecting segment 412 on the inner end face 211 of the electrode body 21; and step S2535 connecting the second connecting segment 412 to the inner end face 211 of the electrode body 21.

[0422] In the above technical solution, by laying the second connecting segment 412 of the conductive element 41 on the inner end face 211 of the electrode body 21, at least a portion of the second connecting segment 412 falls on and connects with the inner end face 211 of the electrode body 21. This helps to increase the connection area between the second connecting segment 412 of the conductive element 41 and the electrode body 21, thereby improving charging performance. Furthermore, it facilitates the setting of the welding nozzle, improving the connection reliability between the second connecting segment 412 of the conductive element 41 and the electrode body 21.

[0423] For example, when the inner end face 211 of the pole body 21 is large, for example, when the inner end face 211 of the pole body 21 is long and narrow, such as rectangular, elliptical, racetrack-shaped, etc., the second connecting segment 412 can be completely laid flat on the inner end face 211 of the pole body 21. Alternatively, for example, when the inner end face 211 of the pole body 21 is small, the position of the inner end face 220 of the adapter structure 22 adjacent to the pole body 21 is the surrounding area 2201 of the pole body 21. The surrounding area 2201 can be set to be flush with the inner end face 211 of the pole body 21. In this case, a part of the second connecting segment 412 can be laid flat on the inner end face 211 of the pole body 21, and the rest 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 long strip) can be supported as a whole, which is convenient for the welding nozzle to be pressed, so that the second connecting segment 412 can be reliably connected to the pole body 21.

[0424] Please refer again to Figures 12A-12E, and in conjunction with Figure 80, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, the terminal post 2 forms a receiving groove 5 that is recessed relative to the first shell wall 111 in the direction away from the electrode post 3 and open in the direction towards the electrode post 3. The electrode post 3 is connected to the terminal post 2 through a conductive part 4, and at least a portion of the conductive part 4 is accommodated in the receiving groove 5 and connected to the terminal post body 21. That is, the terminal post 2 forms the receiving groove 5, the groove wall of the receiving groove 5 is formed by the terminal post 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 towards the active material coating part 32, so that the receiving groove 5 communicates with the receiving cavity 13. At this time, before "step S2534 laying the second connecting segment 412 on the inner end face 211 of the terminal post body 21", the method further includes: step S2533, inserting the second connecting segment 412 into the receiving groove 5.

[0425] Therefore, by providing a receiving groove 5 to accommodate the second connecting section 412 of the conductive component 41, the space occupied by the conductive component 41 in the receiving cavity 13 can be reduced, allowing the receiving cavity 13 to have a larger space to accommodate the active material coating portion 32. This is beneficial for increasing 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 towards the electrode component 13, the second connecting section 412 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0426] For example, when the second connecting segment 412 is housed in the receiving groove 5, the configuration of the receiving groove 5 is not limited.

[0427] For example, the receiving groove 5 is formed on the side of the electrode body 21 and the transition structure 22 facing the electrode component 3 (i.e., the side facing the active material coating portion 32). The transition structure 22 can protrude 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 shape, a portion of the receiving groove 5 is formed on the side of the electrode body 21 facing the electrode component 3, and another portion of the receiving groove 5 is formed on the side of the transition structure 22 facing the electrode component 3. The receiving groove 5 has a shape that is recessed relative to the first shell wall 111 in the direction away from the electrode component 3, so that both the side of the electrode body 21 facing the electrode component 3 and the side of the transition structure 22 facing the electrode component 3 have a spatial second connecting section 412. This not only facilitates the storage of the second connecting section 412 to a greater extent, but also facilitates the design of diverse forms of the second connecting section 412.

[0428] Alternatively, by way of example, when the adapter structure 22 does not bulge relative to the first shell wall 111 in a direction away from the electrode component 3 (i.e., away from the active material coating portion 32), the height difference between the adapter structure 22 and the electrode body 21 can define a receiving groove 5 that is recessed relative to the first shell wall 111 in a direction away from the electrode component 3. Alternatively, the receiving groove 5 can also be defined by the first electrode component 21a and the second electrode component 21b.

[0429] For example, the surface of the electrode body 21 facing the electrode component 3 is the inner end face 211 of the electrode body 21. The inner end face 211 of the electrode body 21 helps to form the receiving groove 5, and the second connecting segment 412 is connected to the inner end face 211 of the electrode body 21. That is, at least a portion of the inner end face 211 of the electrode body 21 helps to define the groove wall of the receiving groove 5, and the second connecting segment 412 is connected to the portion of the inner end face 211 of the electrode 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 formed by the side surface of the electrode body 21 facing the electrode component 3, and the second connecting segment 412 housed in the receiving groove 5 can easily contact and connect to the electrode body 21, improving connection convenience and simplifying the structure. For example, when the electrode body 21 includes a first electrode member 21a and a second electrode member 21b, the surface of the first electrode member 21a facing the electrode component 3 is the inner end face 211 of the electrode body 21.

[0430] Please refer again to Figures 12A-12E, and in conjunction with Figure 81. Figure 81 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, when the electrode component 3 includes multiple electrode assemblies 31 stacked together, before "step S2534 laying the second connecting segment 412 on the inner end face 211 of the electrode post body 21", the method further includes: step S2531, setting the electrode post component 2 on one side of the electrode component 3 extending from the tab 33; step S2532, adjusting the angle of the electrode post component 2 so that the normal of the inner end face 211 of the electrode post body 21 is close to the stacking direction of the multiple electrode assemblies 31 (e.g., the fourth direction F4 shown in Figure 12C). In this embodiment, the stacking step of the electrode assembly 31 can be performed before the gathering part 313 is connected to the pole member 2, or after the gathering part 313 is connected to the pole member 2. That is, the gathering part 313 can be formed by stacking and connecting the multilayer tabs 311 of at least two electrode assemblies 31, or it can be formed by stacking and connecting the multilayer tabs 311 of only one electrode assembly 31.

[0431] The phrase "the normal of the inner end face 211 of the electrode body 21 is close to the stacking direction of the multiple electrode components 31" means that the normal of the inner end face 211 of the electrode body 21 is consistent with or substantially consistent with the stacking direction of the multiple electrode components 31. "Substantially consistent" can be understood as the included angle between the two being small, for example, less than 10°. The phrase "setting the electrode component 2 on one side of the protruding tab 33 of the electrode component 3" can be understood as: the tab 33 is located on one side of the active material coating portion 32. Setting the electrode component 2 and the tab 33 on the same side of the active material coating portion 32 helps to shorten the total length of the conductive portion 4, save materials, and reduce 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 electrode body 21 is close to the stacking direction of the multiple electrode components 31, the electrode part 2 can be located on the side of the protruding tab 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 electrode body 21.

[0432] In the above technical solution, by first adjusting the position and angle of the electrode component 2 so that the normal of the inner end face 211 of the electrode body 21 is close to the stacking direction of the multiple electrode components 31, and then laying the second connecting segment 412 of the conductive component 41 on the inner end face 211 of the electrode body 21, there is no need to adjust the angle of the electrode body 21 again. This ensures that there is sufficient space near the mating position of the second connecting segment 412 and the inner end face 211 of the electrode body 21 for welding operations, thereby simplifying the operation.

[0433] For example, referring again to Figure 81, before "step S2534, laying the second connecting segment 412 on the inner end face 211 of the electrode body 21", the procedure also includes "step S2533, inserting the second connecting segment 412 into the receiving groove 5". This can be performed before "step S2533, inserting the second connecting segment 412 into the receiving groove 5" by executing "step S2531, setting the electrode component 2 on one side of the protruding tab 33 of the electrode component 3; step S2532, adjusting the angle of the electrode component 2 so that the normal of the inner end face 211 of the electrode body 21 is close to the stacking direction of the multiple electrode assemblies 31". In this way, after the second connecting segment 412 is inserted into the receiving groove 5 and laid on the inner end face 211 of the electrode body 21, there is no need to adjust the angle of the electrode body 21 again. This ensures sufficient space near the mating position of the second connecting segment 412 and the inner end face 211 of the electrode body 21 for welding operations, thus simplifying the operation.

[0434] The form of the conductive element 41 is not limited to the above embodiments. For example, the design of the conductive element 41 can also have at least the following two embodiments.

[0435] In some embodiments, referring to FIG48, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 surrounding the electrode body 21, and the inner end face 211 of the electrode body 21 protrudes from the surrounding region 2201 in the direction of the electrode component 3. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a raised shape, and the outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0436] Therefore, by setting the inner end face 211 of the electrode body 21 to protrude out of the surrounding area 2201 in the direction of the electrode component 3, the electrode body 21 can be retracted inward in the direction of the receiving cavity 13 when the height of the electrode body 21 is constant, so as to reduce the space occupied by the electrode component 2 on the outside of the housing component 1 and reduce the size of the battery cell 102 in the direction of setting the electrode component 2 (for example, the first direction F1 shown in FIG3).

[0437] In some embodiments, referring to FIG48 and FIG82, FIG82 is a flowchart of the assembly method of a battery cell provided in some embodiments of the present application. The conductive member 41 includes a first conductive segment 415 laid on the inner end face 211 of the electrode body 21, and a second conductive segment 416 offset from the inner end face 211 of the electrode body 21. The second conductive segment 416 protrudes relative to the first conductive segment 415 in a direction away from the electrode component 3 (i.e., towards the outside, or towards the direction away from the active material coating portion 32). The tab portion 33 is connected to the second conductive segment 416. At this time, "step S20, connecting the electrode component and the electrode component" further 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 tab portion 33 to the second conductive segment 416.

[0438] Thus, when the inner end face 211 of the electrode body 21 is small (for example, the transition structure 22 is set as an elongated strip extending along the length direction of the first shell wall 111, and the electrode body 21 is located in the center of the transition structure 22 and has a circular outline), the height difference between the inner end face 211 of the electrode body 21 and the surrounding area 2201 can be used to accommodate the second conductive segment 416 of the conductive element 41 and the tab 33, thereby making full use of space, reducing the space occupied by the conductive part 4 in the receiving cavity 13, and improving the energy density of the battery cell 102. For example, if the part where the tab 33 connects to the second conductive segment 416 (such as the folding part 313 in this document) is elongated, the second conductive segment 416 can also be set as elongated, while the first conductive segment 415 can be set as a circle that matches the electrode body 21, which can meet the connection requirements.

[0439] In addition, when the conductive element 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 the direction away from the electrode component 3, a material with a certain hardness and thickness can be selected to process the conductive element 41. For example, the conductive element 41 can be a metal sheet.

[0440] In some embodiments, referring to FIG49, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 surrounding the electrode body 21. The surrounding region 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction towards the electrode component 3. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a raised shape. The outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0441] Therefore, by setting the surrounding area 2201 to protrude from the inner end face 211 of the electrode body 21 in the direction of the electrode component 3, a space for accommodating the conductive part 4 can be formed between the surrounding area 2201 and the inner end face 211 of the electrode body 21, thereby reducing the space occupied by the conductive part 4 in the accommodating cavity 13 and improving the energy density of the battery cell 102.

[0442] In some embodiments, referring to FIG49 and FIG83, FIG83 is a flowchart of the assembly method of a battery cell provided in some embodiments of the present application. The inner end face 211 of the electrode post body 21 includes a mating region 211a opposite to the annular hole of the surrounding region 2201. The conductive member 41 includes a first conductive segment 415 laid in the mating region 211a and a third conductive segment 417 offset from the mating region 211a. The third conductive segment 417 protrudes relative to the first conductive segment 415 toward the electrode component 3 (i.e., toward the inward side, or toward the active material coating portion 32). The tab portion 33 is connected to the third conductive segment 417. At this time, "step S20, connecting the electrode component and the electrode post component" further 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 tab portion 33 to the third conductive segment 417.

[0443] Thus, when the inner end face 211 of the pole body 21 is small (for example, the adapter structure 22 is configured as an elongated strip extending along the length direction of the first shell wall 111, and the pole body 21 is located in the center of the adapter structure 22 with a circular outline), by setting the first conductive segment 415 to be small (e.g., circular) so that it can extend into the annular hole surrounding the region 2201 and be laid in the mating region 211a, the adapter 41 can satisfy both the connection requirements with the inner end face 211 of the pole body 21 and the connection requirements with the tab 33. For example, if the portion of the tab 33 connected to the third conductive segment 417 (such as the retracted portion 313 described herein) is elongated, the third conductive segment 417 can also be set as elongated, thereby increasing the connection area between the two. At the same time, setting the first conductive segment 415 to a shape that matches the mating region 211a (e.g., circular) can satisfy the connection requirements.

[0444] Furthermore, when the conductive element 41 includes a first conductive segment 415 and a 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, a material with a certain hardness and thickness can be selected to process the conductive element 41. For example, the conductive element 41 can be a metal sheet.

[0445] In some embodiments of this application, when the adapter structure 22 is formed as an elongated strip (e.g., rectangular, elliptical, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111, and the outline shape of the pole body 21 matches the outline shape of the adapter structure 22 (e.g., rectangular, elliptical, racetrack-shaped, 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 region 2201 is flush with the inner end face 211 of the electrode body 21 (the surrounding region 2201 is flush with the inner end face 211 of the electrode body 21), concave (the inner end face 211 of the electrode body 21 protrudes from the surrounding region 2201 in the direction of the electrode component 3), or convex (the surrounding region 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction of the electrode component 3), the electrode connection portion of the electrical part 4 (e.g., the tab 33 or the conductive member 41) (e.g., the folding portion 313 of the tab 33 in this article, or the second connection segment 412 or the first conductive segment 415 of the conductive member 41) can be set as an elongated strip that matches the contour shape of the inner end face 211 of the electrode body 21 and laid on the inner end face 211 of the electrode body 21, thereby increasing the connection area between the conductive part 4 and the electrode body 21 and improving the charging performance.

[0446] For example, the conductive part 4 may include a pole connection part, which may be a relatively rigid plate shape, such as one that will not bend or deform downward under the action of gravity, such as the folding part 313 of the tab 33 described herein (such as an ultrasonic weld), or the second connecting section 412 (such as a metal sheet) or the first conductive section 415 (such as a metal sheet) of the conductive member 41.

[0447] In some embodiments of this application, please refer again to FIG. 6. The electrode component 3 includes an active material coating portion 32 housed in the receiving cavity 13. The active material coating portion 32 is connected to the electrode post body 21 via a conductive portion 4. The conductive portion 4 is bent to form at least two opening slots 42, wherein the openings of the two opening slots 42 have different orientations and are adjacent in the direction from the electrode post body 21 to the active material coating portion 32 (for example, as shown in FIG. 6, one of the two adjacent opening slots 42 faces left and the other faces right, making the conductive portion 4 approximately "S" shaped). Thus, the conductive portion 4 can present a serpentine shape with reciprocating bends. The conductive portion 4 can play a buffering role. When the battery cell 102 is used in a vibration environment, it can reduce the impact of the active material coating portion 32 toward the first shell wall 111, thereby protecting the electrode component 3 and improving the reliability of the battery cell 102. Furthermore, since the conductive portion 4 does not extend irregularly, the mutual interference and scratching between the tabs 311 in the conductive portion 4 can be reduced, as well as the risk of the tabs 311 being inserted backwards into the active material coating portion 32, thereby further improving the reliability of the battery cell 102.

[0448] For example, referring again to FIG6, when the conductive part 4 includes a tab 33 and a conductive member 41 connected to the tab 33, and the tab 33 is connected to the pole body 21 through the conductive member 41, the conductive member 41 and the tab 33 are bent together to form two adjacent opening slots 42 with opposite opening orientations. For example, the first connecting segment 411 and the tab 33 define another opening slot 42 (e.g., the first opening slot 421), and an opening slot 42 (e.g., the second opening slot 422) is defined between the first connecting segment 411 and the second connecting segment 412. Thus, the conductive part 4 can present a reciprocating 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.

[0449] Alternatively, as exemplarily, referring to FIG10D, when the tab 33 constitutes the conductive portion 4 extending to and connecting to the electrode body 21, and the tab 33 is bent alone to form two adjacent opening slots 42 with opposite opening orientations, the conductive portion 4 can thus exhibit a reciprocating S-shape, thereby shortening the length of the conductive portion 4, simplifying its structure, and facilitating its processing.

[0450] Referring to Figures 10A-10D, 12A-10E, and Figure 84, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application, in some embodiments of this application, when the conductive part 4 is bent to form at least two opening grooves 42, and the openings of two adjacent opening grooves 42 have different orientations and are adjacent in the direction from the electrode member 2 to the active material coating part 32, "step S30, installing the electrode member 2 connected to the electrode member 3 to the first shell wall 111" may specifically include: "step S30c, shaping the conductive part 4 to bend the conductive part 4 to form the above-mentioned at least two opening grooves 42." The method and time of shaping the conductive part 4 are not limited. For example, it can be performed in conjunction with the covering action of the electrode member 2 to the first shell wall 111, or in conjunction with the covering action of the first electrode member 21a to the second electrode member 21b, thereby improving processing efficiency.

[0451] For example, please refer to FIG85, which is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. "Step S30c, shaping the conductive part 4 to bend the conductive part 4 to form the above-mentioned at least two opening grooves 42" can specifically be: Step S30c1, bending the portion of the conductive part 4 located between the terminal post component 2 and the active material coating part 32 to form two opening grooves 42 with opposite opening directions, such as a first opening groove 421 and a second opening groove 422. As a result, step S30c can be simplified, and the conductive part 4 can present a reciprocating 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.

[0452] For example, please refer to Figures 12A-10E and Figure 86. Figure 86 is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. The battery cell 102 includes a shaping bracket 9 disposed on the side of the electrode component 3 near the terminal post component 2. The shaping bracket 9 has a through hole 91. In the state where the conductive part 4 passes through the through hole 91, the active material coating part 32 connected to the conductive part 4 is located inside the shaping bracket 9, and the terminal post component 2 connected to the conductive part 4 is located outside the first shell wall 111, "step S30c1, making The conductive part 4 located between the electrode post component 2 and the active material coating part 32 is bent and deformed into two opening grooves 42 with opposite opening directions. Specifically, step S30c11 involves the conductive part 4 forming two opening grooves 42 with opposite opening directions on the inner and outer sides of the shaping bracket 9, while simultaneously covering the electrode post component 2 towards the first shell wall 111. That is, the conductive part 4 forms one opening groove (i.e., the first opening groove 421) on the inner side of the shaping bracket 9 and another opening groove (i.e., the second opening groove 422) on the outer side of the shaping bracket 9. Thus, by setting the shaping bracket 9, it is easy for the conductive part 4 to bend into two opening grooves 42 with opposite opening directions, reducing the processing difficulty. This solution is applicable when the conductive part 4 is composed solely of the electrode tab 33, and also applicable when the conductive part 4 is composed of both the electrode tab 33 and the conductive element 41.

[0453] For example, referring to Figure 39, the ratio of the width W2 of the electrode post 2 to its length L2 is between 10% and 60%, a range applicable to both the positive and negative electrode post 2. Further, the ratio of the width W2 to the length L2 of the electrode post 2 can also be between 25% and 40%, for example, if the width W2 of the electrode post 2 is approximately 21 mm and the length L2 is approximately 63 mm, the ratio of the width W2 to the length L2 of the electrode post 2 is approximately 33%.

[0454] Therefore, by setting the ratio of the width W2 of the electrode component 2 to the length L2 of the electrode component 2 to be 10% to 60%, the overall area of ​​the electrode component 2 can be relatively large, which is beneficial to ensure that the electrical connection area between the electrode component 2 and the electrode component 3 can meet the relatively large requirements. At the same time, the width of the electrode component 2 is relatively small compared to its length. Thus, when connecting the electrode component 2 and the electrode component 3, the electrode component 2 can be placed with one edge of its width facing the active material coating part 32. Since the width of the electrode component 2 is small, it is beneficial to shorten the distance between the electrode component 2 and the active material coating part 32, thereby shortening the length of the conductive part 4 and reducing the redundancy of the conductive part 4.

[0455] For example, referring to Figure 39, the terminal component 2 can be configured such that the ratio of the width W2 of the terminal component 2 to the width W1 of the first shell wall 111 is 20% to 90%, a range applicable to both the positive and negative terminal components 2. Further, the ratio of the width W2 of the terminal component 2 to the width W1 of the first shell wall 111 is 70% to 80%, for example, the width W2 of the terminal component 2 is approximately 21 mm, and the width W1 of the first shell wall 111 is approximately 28 mm, resulting in a ratio of approximately 75%. This facilitates full utilization of the space in the width direction of the first shell wall 111 by the terminal component 2. For example, the width W1 of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the width direction of the first shell wall 111, for example, as shown in Figure 3, the width of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the second direction F2.

[0456] For example, referring to Figure 39, when two pole pieces 2 are provided on the first shell wall 111 at intervals along its length, the ratio of the length L2 of the pole piece 2 to the length L1 of the first shell wall 111 is 25% ± 15% (i.e., 10% to 40%). This range applies to both the positive and negative pole pieces 2. Further, the ratio of the length L2 of the pole piece 2 to the length L1 of the first shell wall 111 is 15% to 30%. For example, if the length L2 of the pole piece 2 is approximately 63 mm and the length L1 of the first shell wall 111 is approximately 297 mm, the ratio of the length L2 of the pole piece 2 to the length L1 of the first shell wall 111 is approximately 21%. This allows the pole piece 2 to fully utilize the space along the length of the first shell wall 111. For example, the length L1 of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the length direction of the first shell wall 111. For example, as shown in FIG3, the length of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the third direction F3.

[0457] For example, referring to FIG4, the shape of the mounting hole 112 matches the outline shape of the pole member 2. For example, when the pole member 2 includes the adapter structure 22, the outline shape of the adapter structure 22 (i.e. the outer ring shape of the adapter structure 22) matches the shape of the mounting hole 112, which facilitates the connection between the pole member 2 and the first shell wall 111, and facilitates the pole member 2 to expose more area in the direction of the receiving cavity 13, which is conducive to accommodating the conductive part 4 and / or connecting to the conductive part 4.

[0458] For example, the shape of the mounting hole 112 matches the outline shape of the pole member 2, and is orthographically projected onto a projection plane perpendicular to the thickness direction of the first shell wall 111. The orthographic projection of the mounting hole 112 on the projection plane falls completely within the orthographic projection range of the pole member 2 on the projection plane, thereby making the first shell wall 111 and the pole member 2 have a certain overlapping area, which is beneficial to the simple and reliable connection between the two.

[0459] Please refer to Figure 4. In some embodiments of this application, the mounting hole 112 is an elongated hole (e.g., rectangular, elliptical, or racetrack-shaped), and the electrode post 2 is formed as an elongated structure (e.g., rectangular, elliptical, or racetrack-shaped) that matches the shape of the mounting hole 112. When the electrode post 2 is connected to the electrode post 3 first, and then the electrode post 2 and the electrode post 3 are installed together into the housing 11, and then the electrode post 2 extends from the mounting hole 112 to the outside of the first housing wall 111, and then the electrode post 2 is flipped over from the outside of the first housing wall 111 to cover the mounting hole 112, and then the electrode post 2 is connected to the first housing wall 111, if the electrode post 2 is set as an elongated structure that matches the shape of the mounting hole 112, the electrode post 2 can be adjusted so that its thickness direction is parallel to the width direction of the mounting hole 112 (e.g., as shown in Figure 4). The second direction F2) approaches the mounting hole 112 at an angle. After the pole piece 2 passes through the mounting hole 112, the thickness direction of the pole piece 2 is rotated to approach the thickness direction of the first shell wall 111 (for example, the first direction F1 shown in Figure 4). In this way, the space required for the flipping movement of the pole piece 2 is smaller, which can reduce the space required for the flipping of the pole piece 2, thereby helping to shorten the length of the conductive part 4, save materials, reduce costs, and reduce the redundancy of the conductive part 4, reduce the space occupied by the conductive part 4 in the receiving cavity 13, which is beneficial to improving the energy density of the battery cell 102.

[0460] According to a second aspect of the present application, the present application also provides a battery cell 102, which is manufactured using the assembly method of any of the above embodiments, thereby improving the reliability of the battery cell 102.

[0461] For example, the shell body 11 is a semi-closed cylindrical shape with an opening 113 at one end, and the end of the shell body 11 opposite to the opening 113 serves as the first shell wall 111; or, the shell cover 12 is flat and serves as the first shell wall 111. Thus, the shell component 1 has various shapes and can adapt to various application scenarios.

[0462] In some embodiments of this application, referring again to FIG3, the battery cell 102 further includes a pressure relief device 6, which is disposed on the housing component 1. Exemplarily, the pressure relief device 6 may be an explosion-proof valve installed on the housing component 1, or it may be integrally formed on a thinned area of ​​the housing component 1. Thus, by providing the pressure relief device 6, when the pressure inside the housing component 1 exceeds a preset value, the pressure can be directionally released through the pressure relief device 6, thereby improving the safety and reliability of the battery cell 102.

[0463] For example, referring to Figure 3, the pressure relief device 6 and the terminal post component 2 are located on the same side. Since the terminal post component 2 is located on the first housing wall 111, when the pressure relief device 6 is also located on the first housing wall 111, the pressure relief device 6 and the terminal post component 2 are located on the same side. As a result, the design of the other housing walls besides the first housing wall 111 can be simplified, and the structure and processing of the battery cell 102 can be simplified.

[0464] For example, the pressure relief device 6 and the pole member 2 are located on opposite sides. Since the pole member 2 is located on the first shell wall 111, when the pressure relief device 6 is also located on another wall of the shell member 1 other than the first shell wall 111, for example, the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, and the pressure relief device 6 is located on the second shell wall 114, or the pressure relief device 6 is located on the shell cover 12, then the pressure relief device 6 and the pole member 2 are located on opposite sides. Therefore, there is no need to consider reducing the volume of the pole member 2 by occupying the space of the first shell wall 111, so that the shape and area of ​​the pole member 2 can be flexibly designed as needed.

[0465] For example, the pressure relief device 6 and the pole member 2 are located on opposite sides. Since the pole member 2 is located on the first shell wall 111, when the pressure relief device 6 is located on a wall of the shell member 1 other than the first shell wall 111, for example, the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, and the pressure relief device 6 is located on the second shell wall 114, or the pressure relief device 6 is located on the shell cover 12, then the pressure relief device 6 and the pole member 2 are located on opposite sides. Therefore, there is no need to consider reducing the volume of the pole member 2 by occupying the space of the first shell wall 111, so that the shape and area of ​​the pole member 2 can be flexibly designed as needed.

[0466] The housing component 1 can be surrounded by multiple non-coplanar walls. For example, the rectangular housing component 1 is surrounded by six walls, one of which is the first housing wall 111. The pressure relief device 6 is placed on any other wall other than the first housing wall 111, and the pole component 2 is placed on the first housing wall 111, so that the two are located on opposite sides.

[0467] According to a third aspect of this application, this application also provides a battery 100, including a battery cell 102 of any of the above-described embodiments. It is worth noting that the battery 100 according to this application embodiment may or may not include a casing 101. Therefore, since the reliability of the battery cell 102 according to this application embodiment is improved, it is beneficial to improve the performance of the battery 100.

[0468] For example, the battery 100 may further include a busbar, and multiple battery cells 102, at least two of which are electrically connected through the busbar. This allows for the series and / or parallel connection of multiple battery cells 102. For instance, when multiple battery cells 102 are connected in series, the negative terminal 2 of one battery cell 102 is connected to the positive terminal 2 of the next battery cell 102 through a busbar, while the positive terminal 2 of the same battery cell 102 is connected to the negative terminal 2 of the previous battery cell 102 through another busbar.

[0469] For example, referring to FIG2, the battery 100 includes a housing 101, and multiple battery cells 102 are housed in the housing 101. The bottom of the housing 101 is a housing bottom plate 1013. The terminal post 2 is disposed on the side of the housing component 1 facing the housing bottom plate 1013, or on the side of the housing component 1 away from the housing bottom plate 1013.

[0470] During the use of the battery 100, such as in vehicle use, the bottom plate 1013 of the casing is located at the bottom of the casing 101 in the direction of gravity. Therefore, when the terminal post 2 is located on the side of the housing component 1 facing the bottom plate 1013, it means that the terminal post 2 is located at the bottom of the housing component 1 in the direction of gravity; and when the terminal post 2 is located on the side of the housing component 1 away from the bottom plate 1013, it means that the terminal post 2 is located at the top of the housing component 1 in the direction of gravity. Thus, the relative position of the terminal post 2 and the bottom plate 1013 is not limited, allowing for flexible arrangement of the battery cell 102 and the casing 101.

[0471] Specifically, when the terminal post 2 of the battery cell 102 is located on the side of the housing component 1 facing the bottom plate 1013 of the box, the battery cell 102 is in an inverted state, and the depressurized products are ejected in the direction away from the passenger compartment, which is safer; when the terminal post 2 of the battery cell 102 is located on the side of the housing component 1 away from the bottom plate 1013 of the box, the battery cell 102 is in an upright state, and the electrolyte is not easy to leak.

[0472] According to a fourth aspect of this application, this application also provides an electrical device including a battery 100 of any of the above-described embodiments, the battery 100 being used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems using the battery 100. Because the performance of the battery 100 is improved, it is beneficial to improve the power consumption performance of the electrical device.

[0473] The shape of the battery cell 102 processed according to the assembly method of the embodi...

Claims

1. A method of assembling a battery cell, wherein, The battery cell includes a housing component, a terminal component mounted on the housing component, and an electrode component housed in the housing component and connected to the terminal component. The housing component includes a body and a cover. The body has an opening, and the cover closes the opening. The body or the cover includes a first housing wall. The assembly method includes: Connect the electrode component to the pole component; The electrode post component connected to the electrode component is installed onto the first housing wall.

2. The method of assembling according to claim 1, wherein, The first shell wall has mounting holes. The electrode component includes an electrode body, a transition structure and an insulating structure. The electrode component is connected to the electrode body. The transition structure surrounds the electrode body and is connected to the first shell wall. The insulating structure is insulated between the transition structure and the electrode body. The steps of connecting the electrode component to the pole component specifically include: Connect the electrode component to the electrode body; The step of installing the electrode post component connected to the electrode component to the first housing wall specifically includes: The electrode post component connected to the electrode component is disposed at the mounting hole, and the adapter structure is connected to the first shell wall.

3. The method of assembling according to claim 2, wherein, The electrode component is connected to the electrode post body via a conductive part; the step of connecting the electrode component to the electrode post body specifically includes: The electrode component and the conductive part connected to the electrode component are placed inside the first shell wall, and the conductive part is passed through the mounting hole to the outside of the first shell wall. The conductive portion extending to the outside of the first shell wall is connected to the pole body of the pole component located on the outside of the first shell wall.

4. The assembly method according to claim 3, wherein, The steps of placing the electrode post component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: The electrode component connected to the conductive part is covered by the mounting hole from the outside of the first shell wall so that the adapter structure abuts against the outside of the first shell wall; The transition 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, wherein, The end of the housing opposite the opening is the first housing wall; the step of placing the electrode component and the conductive part connected to the electrode component inside the first housing wall, and extending the conductive part through the mounting hole to the outside of the first housing wall specifically includes: Adjust the relative positions of the housing, 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 housing, and the opening of the housing faces the conductive part; The electrode components and the conductive parts are installed into the housing.

6. The assembly method according to claim 3 or 4, wherein, The shell cover is the first shell wall; between the steps of placing the electrode component and the conductive part connected to the electrode component inside the first shell wall and extending the conductive part through the mounting hole to the outside of the first shell wall, and the steps of placing the pole component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall, the following step is also included: The housing is fitted over the electrode component; Connect the shell body to the shell cover.

7. The assembly method according to claim 6, wherein, The inner side of the shell cover has an insulating support, and the step of connecting the electrode component to the electrode post body further includes a step before fitting the shell body over the electrode component: The electrode component is placed with the conductive part connected to it facing downwards, and the shell cover is placed with the insulating support facing upwards; An insulating film is wrapped around the electrode component supported on top of the insulating bracket, so that the insulating film is connected to the insulating bracket; The specific steps of fitting the housing over the electrode component include: Place the shell with the opening facing down, and then place the shell over the electrode component covered with the insulating film from top to bottom.

8. The assembly method according to claim 2, wherein, The steps of placing the electrode post component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: The electrode post component connected to the electrode component extends from the inside of the first housing wall through the mounting hole to the outside of the first housing wall; The pole piece extending to the outside of the first housing wall is covered by the mounting hole from the outside of the first housing wall, so that the adapter structure abuts against the outside of the first housing wall. The transition structure is connected to the first shell wall from the outside of the first shell wall.

9. The assembly method according to claim 8, wherein, The mounting hole is an elongated hole, and the pole piece is formed into an elongated structure that matches the shape of the mounting hole; The step of extending the electrode post component connected to the electrode component from the inside of the first housing wall through the mounting hole to the outside of the first housing wall specifically includes: Adjust the placement angle of the pole piece so that the thickness direction of the pole piece matches the width direction of the mounting hole, and the length direction of the pole piece forms an angle with the length direction of the mounting hole; The pole piece is positioned at the specified angle and extends through the mounting hole to the outside of the first housing wall.

10. The assembly method according to claim 9, wherein, Specifically, the angle between the length direction of the pole component and the length direction of the mounting hole is as follows: Align the longitudinal direction of the pole piece with the diagonal direction of the mounting hole; or The length direction of the pole component extends from one end of the mounting hole to the other end, and is inclined to the length direction of the mounting hole.

11. The assembly method according to any one of claims 8-10, wherein, The end of the housing opposite the opening is the first housing wall; the step of passing the electrode post component connected to the electrode component from the inside of the first housing wall through the mounting hole to the outside of the first housing wall specifically includes: Adjust the relative positions of the housing, the electrode component, and the pole component so that the electrode component is located on the side of the pole component connected to it that is away from the housing, and the opening of the housing faces the pole component; The electrode components and the pole components are installed into the housing.

12. The assembly method according to any one of claims 8-10, wherein, The shell cover is the first shell wall; after the step of passing the electrode post component connected to the electrode component through the mounting hole from the inside of the first shell wall to the outside of the first shell wall, the method further includes the step of: The housing is fitted over the electrode component; Connect 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 mounting hole with the pole member that protrudes to the outside of the first shell wall, so that the adapter structure abuts against the outside of the first shell wall.

13. The assembly method according to any one of claims 8-10, wherein, The shell cover is the first shell wall; after the step of passing the electrode post component connected to the electrode component through the mounting hole from the inside of the first shell wall to the outside of the first shell wall, the method further includes the step of: The housing is fitted over the electrode component; Connect the shell body to the shell cover; The step of fitting the shell over the electrode component is performed after the step of connecting the adapter structure to the first shell wall from the outside of the first shell wall.

14. The assembly method according to claim 2, wherein, The steps of placing the electrode post component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: Both the pole post component and the electrode component connected to the electrode component are placed inside the first shell wall; The electrode post component connected to the electrode component is covered by the mounting hole from the inside of the first housing wall, so that the adapter structure abuts against the inside of the first housing wall. The transition structure is connected to the first shell wall from the outside of the first shell wall.

15. The assembly method according to claim 12, wherein, The end of the shell body opposite the opening is the first shell wall; The step of placing both the pole post component connected to the electrode component and the electrode component inside the first shell wall specifically includes: Adjust the relative positions of the housing, the electrode component, and the pole component so that the electrode component is located on the side of the pole component connected to it that is away from the housing, and the opening of the housing faces the pole component; The electrode components and the pole components are installed into the housing.

16. The assembly method according to claim 12, wherein, The shell cover is the first shell wall; after the step of connecting the transition structure to the first shell wall from the outside, the method further includes the step of: The housing is fitted over the electrode component; Connect the shell body to the shell cover.

17. The assembly method according to any one of claims 2-16, wherein, The insulating structure includes a sealing structure member, which is circumferentially disposed on the side of the adapter structure facing the electrode body and is at least partially clamped between the adapter structure and the electrode body in the inward and outward directions of the first shell wall. Prior to the step of connecting the electrode component to the electrode body, the method further includes: The pole piece is provided.

18. The assembly method according to claim 17, wherein, The electrode body includes a peripheral portion, and the adapter structure is clamped on both sides of the peripheral portion in the inward and outward directions of the first shell wall by the insulating structure. At least a portion of the sealing structure is clamped between the side of the peripheral portion facing the electrode component and the adapter structure. The steps of providing the pole piece specifically include: The adapter structure is assembled or shaped to complete the clamping of the sealing structure by the peripheral portion and the adapter structure.

19. The assembly method according to claim 17, wherein, The adapter structure includes a mating ring portion, and the pole body includes a through portion passing through the mating ring portion, and an inner limiting portion and an outer limiting portion connected to the through portion and clamped on the inner and outer sides of the mating ring portion. The step of providing the pole component by clamping at least a portion of the sealing structure between the mating ring portion and the inner limiting portion specifically includes: The pole body is assembled or shaped to complete the clamping of the sealing structure by the mating ring and the pole body.

20. The assembly method according to any one of claims 2-16, wherein, The first housing wall has a mounting hole, and a sealing ring is provided around the mounting hole. The sealing ring is clamped between the pole member and the first housing wall. The steps of placing the electrode post component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: The sealing ring is installed in the mounting hole of the first shell wall; The electrode post component connected to the electrode component is placed over the mounting hole so that the sealing ring is sandwiched between the electrode post component and the first housing wall.

21. The assembly method according to any one of claims 2-20, wherein, The transition structure is formed as an elongated strip extending along the length of the first shell wall, and the outline shape of the pole body matches the outline shape of the transition structure. Alternatively, the transition structure is formed as an elongated strip extending along the length of the first shell wall, and the pole body is located at the center of the length of the transition structure and is circular; The step of connecting the electrode component to the electrode body includes, prior to: Provide the pole body and the adapter structure; Assemble the pole piece.

22. The assembly method according to claim 1, wherein, The electrode component includes an electrode body, the electrode body includes a first electrode component and a second electrode component, the second electrode component is mounted on the first shell wall, the first electrode component is mounted on the second electrode component, and the electrode component is connected to the first electrode component. The steps of connecting the electrode component to the pole component specifically include: Connect the electrode component to the first electrode post; The step of installing the electrode post component connected to the electrode component to the first housing wall specifically includes: The first electrode post, which is connected to the electrode component, is assembled and connected to the second electrode post, which is installed on the first shell wall.

23. The assembly method according to claim 22, wherein, The second electrode post defines a mating hole, and the first electrode post covers the side of the second electrode post opposite to the electrode component and seals the mating hole; The step of assembling the first electrode post connected to the electrode component to the second electrode post installed on the first housing wall specifically includes: The first electrode post, which is connected to the electrode component, is placed over the mating hole from the outside of the second electrode post; The first pole piece is connected from the outside of the first shell wall to the second pole piece.

24. The assembly method according to claim 23, wherein, The specific steps of connecting the electrode component to the first electrode post include: The electrode component and the conductive part are placed inside the first shell wall, and the conductive part is passed through the mating hole to the outside of the second pole piece; The conductive portion extending to the outside of the first housing wall is connected to the first pole piece located on the outside of the first housing wall.

25. The assembly method according to claim 23, wherein, Before the step of covering the mating hole from the outside of the second electrode member with the first electrode post connected to the electrode component, the method further includes: The electrode component and the first electrode post connected to the electrode component are placed inside the first shell wall; The first pole piece is passed through the mating hole to the outside of the second pole piece.

26. The assembly method according to any one of claims 1-25, wherein, The electrode component includes a tab portion formed by stacking and connecting multiple layers of tab sheets, and the tab portion is connected to the electrode post component through the tab portion; the step of connecting the electrode component to the electrode post component further includes: The electrode component has multiple layers of tabs stacked and connected to form a gathered portion.

27. The assembly method according to claim 26, wherein, The electrode component includes multiple electrode assemblies; the step of connecting multiple layers of electrode tabs in the tab portion of the electrode component to form a folding portion specifically includes: Multiple electrode assemblies are stacked along the thickness direction of the electrode assembly; The folding portion is formed by stacking and connecting the multilayer tabs of at least two of the electrode assemblies.

28. The assembly method according to claim 26 or 27, wherein, The electrode component includes a tab portion formed by stacking and connecting multiple layers of tab sheets; the electrode post component includes an electrode post body, the surface of the electrode post body facing the electrode component being the inner end face of the electrode post body; the step of connecting the electrode component to the electrode post component specifically includes: The gathering part is laid on the inner end face of the pole body; The folding part is connected to the inner end face of the pole body.

29. The assembly method according to claim 28, wherein, The housing component has a receiving cavity, and the pole component forms a receiving groove that is recessed relative to the first housing wall in a direction away from the electrode component and open in a direction towards the electrode component; Before the step of laying the gathering portion on the inner end face of the pole body, the following steps are also included: The gathering part is inserted into the receiving groove.

30. The assembly method according to claim 28 or 29, wherein, The electrode component includes multiple electrode assemblies stacked together; prior to the step of laying the gathering portion on the inner end face of the electrode post body, the method further includes: The electrode post component is positioned on the side of the electrode component that extends out of the electrode tab; Adjust the angle of the electrode component so that the normal of the inner end face of the electrode body is close to the stacking direction of the plurality of electrode assemblies.

31. The assembly method according to any one of claims 1-25, wherein, The electrode component includes an electrode body, and the electrode component is connected to the electrode body via a conductive part. The conductive part includes an electrode tab formed by the electrode tabs of the electrode component, and a conductive element connected to the electrode tab. The electrode tab is connected to the electrode body via the conductive element. The step of connecting the electrode component to the electrode component specifically includes: Connect the tab to the conductive element.

32. The assembly method according to claim 31, wherein, The electrode component includes multiple electrode assemblies; prior to the step of connecting the electrode tab to the conductive element, the following steps are also included: Multiple electrode assemblies are stacked along the thickness direction of the electrode assembly; At least two of the electrode assemblies are stacked and brought together to form a stacked portion.

33. The assembly method according to claim 31 or 32, wherein, The electrode component includes a stacked portion formed by multiple layers of electrode tabs stacked and gathered together; the step of connecting the electrode portion to the conductive element further includes: The multiple layers of tabs in the stacked section are connected to form a gathering section.

34. The assembly method according to claim 33, wherein, The conductive element includes a first connecting segment, and the step of connecting the electrode portion to the conductive element specifically includes: The gathering portion is stacked on one side of the first connecting segment in the thickness direction; Connect the folding part to the first connecting segment.

35. The assembly method according to any one of claims 31-33, wherein, The conductive component includes a first connecting segment, which includes two clamping portions; the step of connecting the electrode portion to the conductive component specifically includes: The electrode end of the electrode portion is clamped between the two clamping portions; The electrode end of the electrode is connected to the two clamping parts as one unit.

36. The assembly method according to claim 34 or 35, wherein, After the step of connecting the electrode portion to the conductive element, the following is also included: Adjust the angle of the electrode component so that the inner end face of the electrode body faces the electrode component, and so that the first connecting section of the conductive element is supported on the side of the electrode ear away from the electrode body.

37. The assembly method according to any one of claims 31-36, wherein, The step of connecting the electrode component to the pole component further includes: Connect the conductive element to the electrode body.

38. The assembly method according to claim 37, wherein, The electrode component includes an electrode body, and the surface of the electrode body facing the electrode component is the inner end face of the electrode body; the conductive element includes a second connecting segment, and the step of connecting the conductive element to the electrode body specifically includes: The second connecting section is laid on the inner end face of the pole body; The second connecting segment is connected to the inner end face of the pole body.

39. The assembly method according to claim 38, wherein, The electrode post component forms 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 towards the electrode component; Before the step of laying the second connecting segment on the inner end face of the pole body, the following steps are also included: The second connecting segment is inserted into the receiving groove.

40. The assembly method according to claim 38 or 39, wherein, The electrode component includes multiple electrode assemblies stacked together; prior to the step of laying the second connecting segment on the inner end face of the electrode body, the method further includes: The electrode post component is positioned on the side of the electrode component that extends out of the electrode tab; Adjust the angle of the electrode component so that the normal of the inner end face of the electrode body is close to the stacking direction of the plurality of electrode assemblies.

41. The assembly method according to any one of claims 2-21, wherein, The electrode component is connected to the electrode body via a conductive part. The conductive part includes an electrode tab formed by the electrode tabs of the electrode component and a conductive element connected to the electrode tab. The position of the inner end face of the adapter structure adjacent to the electrode body is a surrounding area around the electrode body. The inner end face of the electrode body protrudes from the surrounding area in the direction of the electrode component. The conductive element includes a first conductive segment laid on the inner end face of the electrode body, and a second conductive segment offset from the inner end face of the electrode body, wherein 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 further includes: The conductive element is shaped to include the first conductive segment and the second conductive segment; Connect the tab to the second conductive segment.

42. The assembly method according to any one of claims 2-21, wherein, The electrode component is connected to the electrode body via a conductive part. The conductive part includes an electrode tab formed by the electrode tabs of the electrode component and a conductive element connected to the electrode tab. The position of the inner end face of the adapter structure adjacent to the electrode body is a surrounding area around the electrode body. The surrounding area protrudes from the inner end face of the electrode body in the direction towards the electrode component. The inner end face of the electrode body includes a mating area opposite to the annular hole of the surrounding area. The conductive element includes a first conductive segment laid in the mating area, and a third conductive segment offset from the mating area. The third conductive segment protrudes relative to the first conductive segment toward the electrode component, and the tab is connected to the third conductive segment. The step of connecting the electrode component to the pole component further includes: The conductive element is shaped to include the first conductive segment and the third conductive segment; Connect the tab to the third conductive segment.

43. The assembly method according to any one of claims 1-40, wherein, The electrode component includes an active material coating portion, which is connected to the electrode post component via a conductive portion. The conductive portion is bent to form at least two open slots, with adjacent slots having different opening orientations and being adjacent in the direction from the electrode post component to the active material coating portion. The step of installing the electrode post component connected to the electrode component to the first housing wall specifically includes: The conductive portion is shaped to bend it and form the at least two opening slots.

44. The assembly method according to claim 43, wherein, The step of shaping the conductive portion to bend it and form the at least two opening grooves specifically includes: The conductive portion is shaped to bend it into two opening grooves with openings facing opposite directions.

45. The assembly method according to claim 44, wherein, The battery cell includes a shaping bracket disposed on the side of the electrode component near the terminal post component. The shaping bracket has a perforation. With the conductive portion passing through the perforation, the active material coating portion connected to the conductive portion located inside the shaping bracket, and the terminal post component connected to the conductive portion located outside the first shell wall, the step of shaping the conductive portion to bend it into two opening grooves with opposite opening directions specifically includes: As the pole piece is covered toward the first shell wall, the conductive part forms two opening slots with opposite opening directions on the inner and outer sides of the shaping bracket.

46. ​​A single battery cell, wherein, It is manufactured using the assembly method according to any one of claims 1-45.

47. The battery cell according to claim 46, wherein, The shell body is semi-enclosed cylindrical and has the opening at one end. The end of the shell body opposite to the opening serves as the first shell wall. Alternatively, the shell cover is flat and serves as the first shell wall.

48. The battery cell according to claim 46 or 47, wherein, It also includes a pressure relief device, which is located on the housing component and on the same side or opposite side as the pole component.

49. A battery, wherein, Includes the battery cell according to any one of claims 46-48.

50. The battery according to claim 50, wherein, The battery includes a housing, and the battery cells are multiple and housed in the housing. The bottom of the housing is a housing bottom plate. The terminal post is located on the side of the housing component facing the housing bottom plate, or on the side of the housing component away from the housing bottom plate.

51. An electrical device, wherein, Includes the battery as described in claim 49 or 50.

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