Battery monomer and processing method thereof, battery and power utilization device

Abstract

The invention discloses a battery monomer, a processing method thereof, a battery and an electric device, and belongs to the technical field of batteries. The battery monomer comprises a shell part, a pole part and a battery core part, the shell part is provided with a containing cavity and comprises a first shell wall participating in limiting of the containing cavity, the pole part is installed on the first shell wall and comprises a pole body, the battery core part comprises a battery core body and an adapter, the battery core body is arranged in the containing cavity, and the end of the battery core body is connected with a tab group. The tab group is electrically connected with the pole main body through the adapter, and the adapter supports the free end of the tab group. Thus, the reliability of the battery cell can be improved.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role.

[0003] In the related technology, the power battery includes battery cells. As the core of new energy vehicles, battery cells have high requirements in terms of reliability. Summary of the invention

[0004] The embodiments of the present application provide a battery cell and a processing method thereof, a battery and an electrical device, which can improve the reliability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell component, having a accommodating cavity and comprising a first shell wall that participates in defining the accommodating cavity; a pole component, installed on the first shell wall and comprising a pole body; a battery cell component, comprising a battery cell body and an adapter, the battery cell body is arranged in the accommodating cavity, and a pole tab group is connected to the end thereof, the pole tab group is electrically connected to the pole body through the adapter, and the adapter supports the free end of the pole tab group.

[0006] In the above technical solution, by arranging the pole lug group to be electrically connected to the pole column body through the adapter, and making the adapter support the free end of the pole lug group, the length of the pole lug group can be shortened and the redundancy of the pole lug group can be improved, which is beneficial to improving the problems of wrinkling, bending and breaking of the pole lug sheets of the pole lug group. At the same time, the support of the free end by the adapter is beneficial to reduce the risk of short circuit caused by the free end of the pole lug group being inserted into the inside of the battery body, or inserted into the root position of the pole lug group adjacent to the battery body, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the tab group includes multiple tab sheets, and the multiple tab sheets of the tab group converge and are connected at a position away from the battery body to form a first gathered portion at the free end, and at least a portion of the first gathered portion is connected to a position on a side of a portion of the adapter away from the battery body.

[0008] In the above technical solution, the first gathering part is connected to the adapter by setting the first gathering part, and the first gathering part has a certain rigidity, so as to improve the connection reliability between the first gathering part and the adapter; and at least part of the first gathering part is connected to the side of a part of the adapter away from the battery cell body, so that the above part of the adapter can support at least part of the first gathering part, and the multi-layer pole ear sheets of the first gathering part are not easy to loosen, which can improve the supporting reliability of the adapter to the free end.

[0009] In some embodiments, the adapter includes a first connecting portion and a second connecting portion, the first connecting portion is connected to the pole component, the second connecting portion is connected to the first gathering portion and supports the first gathering portion, at least part of the orthographic projection of the first gathering portion on the first shell wall is located within the orthographic projection range of the second connecting portion on the first shell wall, and the thickness of the second connecting portion is greater than or equal to the thickness of the first gathering portion.

[0010] In the above technical solution, by arranging that the orthographic projection of the supported part of the first gathering part on the first shell wall is located within the orthographic projection range of the second connection part, and the thickness of the second connection part is greater than or equal to the thickness of the first gathering part, the cross-sectional area of ​​the second connection part can be greater than or equal to the cross-sectional area of ​​the first gathering part, which is beneficial to reducing the resistance at the connection position between the second connection part and the first gathering part, and improving the current flow capacity at the connection position between the second connection part and the first gathering part, thereby facilitating reducing the internal resistance of the battery cell and improving the current flow capacity of the battery cell.

[0011] In some embodiments, multiple tab sheets of the tab group converge near the battery cell body to form a second gathering portion, one end of the second gathering portion is bent and connected to the first gathering portion, and the other end is connected to the battery cell body, and the end surface of the portion where the adapter is connected to the first gathering portion extends to a position close to the bending position of the second gathering portion.

[0012] In the above technical solution, one end of the second gathering portion is connected to the first gathering portion by bending, and the end surface of the portion where the adapter is connected to the first gathering portion extends to a position close to the bending of the second gathering portion, so that the adapter can support the entire first gathering portion and improve the supporting reliability of the free end; at the same time, because the multiple pole ear sheets of the pole ear group are only gathered together but not connected when forming the second gathering portion, the adapter can have a certain indirect pressure effect on the bending position of the second gathering portion, which is convenient for improving the tightness of the second gathering portion, so that the second gathering portion maintains a preset gathering shape and cannot disperse, which is beneficial to reducing the risk of the second gathering portion being inserted upside down into the battery cell body.

[0013] In some embodiments, the tab group is bent to form a first open slot, the free end defines at least a portion of a slot wall of the first open slot close to the pole body, and the adapter extends into the first open slot and abuts against the free end.

[0014] In the above technical solution, by arranging the adapter to extend into the first open groove formed by the bending of the pole ear group and abut against the free end, the supporting reliability of the adapter to the free end can be improved. At the same time, the bent pole ear group can play a buffering role. When the battery cell is used in a vibration environment, the impact of the battery cell body toward the first shell wall can be reduced, thereby protecting the battery cell components and improving the reliability of the battery cell.

[0015] In some embodiments, the adapter is bent to form a second opening slot adjacent to the first opening slot and located on a side of the first opening slot facing the pole body, and the opening directions of the second opening slot and the first opening slot are arranged at an angle.

[0016] In the above technical solution, the conductive part composed of the tab group and the adapter can present a reciprocating serpentine shape, and the conductive part can play a buffering role. When the battery cell is used in a vibration environment, it can reduce the impact of the active material coating part toward the first shell wall, play a role in protecting the battery cell components, and improve the reliability of the battery cell. In addition, since the conductive part does not extend randomly, it can improve the mutual interference and scratching between the tabs in the conductive part, and the risk of the tabs being inserted into the battery cell body, thereby further improving the reliability of the battery cell.

[0017] In some embodiments, the end of the adapter away from the pole body has a clamping structure, which supports the free end and includes two clamping parts arranged opposite to each other. The free end is clamped between the two clamping parts and connected to each clamping part.

[0018] In the above technical solution, by clamping the free end between the two clamping parts, the two clamping parts can be used to limit the free end of the pole lug group, which is conducive to improving the connection reliability of the multiple pole lugs of the pole lug group at the free end. At the same time, one of the two clamping parts arranged adjacent to the battery cell body can support the free end of the pole lug group, and support it on the side of the free end of the pole lug group away from the pole column body, so as to prevent the free end of the pole lug group from moving toward the battery cell body and reduce the risk of reverse insertion. In addition, the two clamping parts can protect the free end to reduce the risk of the pole lug at the free end being easily cracked due to thin thickness, which is conducive to improving the welding quality between the pole lug group and the adapter sheet, and improving the connection reliability between the pole lug group and the adapter sheet.

[0019] In some embodiments, the adapter includes a first connection portion, a bending portion and a second connection portion, the first connection portion and the second connection portion are opposite to each other, the bending portion is bent and connected between the first connection portion and the second connection portion, the first connection portion is connected to the pole body, and the second connection portion supports the free end.

[0020] In the above technical solution, the support of the free end of the pole lug group by the second connecting part can improve the redundancy of the pole lug group and reduce the risk of short circuit caused by the pole lug group being inserted upside down into the battery cell body; and the bent adapter can play a role of buffer support under the premise of achieving reliable support for the free end of the pole lug group, which is beneficial to reduce the risk of the battery cell component hitting the shell component and improve the reliability of the battery cell.

[0021] In some embodiments, the thickness of the bending portion is smaller than the thickness of at least one of the first connection portion and the second connection portion; and / or, in the extension direction of the central axis of the bending portion, the width of the bending portion is smaller than the width of at least one of the first connection portion and the second connection portion.

[0022] In the above technical scheme, by setting the thickness of the bending part to be smaller than the thickness of at least one of the first connection part and the second connection part, and the width of the bending part to be smaller than the width of at least one of the first connection part and the second connection part, the first connection part and the second connection part can be made to have a certain rigidity respectively by reducing the material in the form of thinning the thickness and shortening the width at the bending part, so as to realize the reliable connection between the adapter and the pole body, and the reliable connection between the adapter and the pole lug group, and at the same time, the bending part is weakened, which is convenient for the adapter to bend at the bending part; especially for the case where the structure of the adapter is roughly plate-shaped before assembly and there is a bending position in its structure after assembly, at this time, the adapter can realize a soft connection between the pole body and the battery cell body, which is convenient for the adapter to bend smoothly at the bending part during the assembly process, thereby improving the convenience of assembly.

[0023] In some embodiments, the adapter includes multiple adapter foils, which are stacked and partially connected to form a first connection portion and a second connection portion that are spaced apart. The first connection portion is connected to the pole body, and the second connection portion is connected to the free end.

[0024] In the above technical solution, by setting the adapter to include multiple stacked adapter foils, the number of adapter foils, and the structure and size of a single adapter foil can be flexibly set, so that the adapter has a flexible structure and size design, thereby improving the applicability and practicality of the adapter, which is beneficial to reducing the difficulty of connecting with the pole body, reducing the difficulty of connecting with the pole ear group, and improving the convenience of assembly. In addition, since partial areas of the stacked multiple adapter foils are connected to form the first connecting portion and the second connecting portion that are spaced apart, the surfaces of the two adjacent adapter foils that are opposite to each other are partially connected but not completely connected, which is beneficial to reducing the processing steps of the adapter; moreover, since the thickness of a single adapter foil is smaller than the thickness of the adapter, the multiple adapter foils are equivalent to a multi-layer thin plate, and the adapter formed by the multiple adapter foils is easier to bend than the one-piece molded adapter sheet. At the same time, the rigidity of some areas of the adapter is relatively small, which facilitates the bending of the adapter in the above-mentioned area with smaller rigidity during the assembly process of the battery cell. Therefore, the setting of the above-mentioned adapter facilitates the realization of a soft connection between the pole lug group and the pole body, so that the adapter is bent into a certain shape during the assembly process of the battery cell, thereby meeting the design requirements.

[0025] In some embodiments, a portion of the adapter between the first connection portion and the second connection portion forms a third connection portion, and the third connection portion is bent to connect the first connection portion and the second connection portion.

[0026] In the above technical solution, in the part corresponding to the third connection part of the multiple adapter foils of the adapter, two adjacent adapter foils may not be connected, so the rigidity of the third connection part is less than that of the first connection part and the second connection part, which is convenient for bending at the third connection part, so that when the structural form of the adapter changes during the assembly process, for example, the third connection part is not bent before assembly and the third connection part is bent after assembly, it is convenient to improve the assembly convenience. In addition, the bent adapter can play the role of buffer support under the premise of realizing reliable support for the free end of the tab group, which is conducive to reducing the risk of the battery core component hitting the shell component and improving the reliability of the battery cell.

[0027] In some embodiments, the plurality of transfer foils include at least one first transfer foil and at least one second transfer foil, and the first transfer foil and the second transfer foil are respectively connected to two sides of the thickness of the free end.

[0028] In the above technical solution, by arranging the first adapter foil and the second adapter foil to be respectively connected to the thickness sides of the free end, the free end can be separated from the pressurizing device by the first adapter foil and the second adapter foil to protect the free end, reduce the risk of the tab sheets of the tab group being easily cracked due to thin thickness, etc., which is beneficial to improving the welding quality between the tab group and the adapter, and improving the connection reliability between the tab group and the adapter.

[0029] In some embodiments, a plurality of battery cell bodies arranged in sequence along the second direction constitute a battery cell group, all free ends of the battery cell group extend toward a middle position of the battery cell group in the second direction, and are connected to form a first folded portion, and the adapter supports the first folded portion.

[0030] In the above technical solution, a group of battery cells is formed by arranging multiple battery cell bodies, which is beneficial to improving the voltage and capacity of the battery cell, and all the free ends of the battery cell group extend toward the middle position close to the battery cell group in the second direction, which can reduce the offset of the folded position of the battery cell group's pole tab group relative to the center of the battery cell group A in the first direction as shown in the figure. Since the larger the offset, the longer the required pole tab group, the above arrangement can reduce the length of the pole tab group, improve the redundancy of the pole tab group, and reduce the risk of inverted insertion; moreover, the adapter can support the first folded portion formed by connecting all the free ends of the battery cell group, which is convenient for realizing the electrical connection between all the battery cell bodies of the battery cell group and the pole body, and is beneficial to reducing the number of adapters and simplifying the structure of the battery cell.

[0031] In some embodiments, in the second direction, the midpoint of the battery cell group in the second direction is the midpoint of the middle position, and the size of the middle position is less than or equal to 1 / 2 of the size of a battery cell body.

[0032] In the above technical solution, the middle position is not the midpoint in an absolute sense. The middle position is a small area formed around the midpoint. This setting can take into account different assembly requirements and usage requirements while shortening the length of the tab group, which is conducive to reducing assembly requirements and improving the applicability and practicality of battery cells.

[0033] In some embodiments, there are multiple battery cell groups which are sequentially arranged along the second direction, and the adapter supports all the first folded portions.

[0034] In the above technical solution, by setting up multiple groups of battery cell groups, it is beneficial to further improve the voltage and capacity of the battery single body, and the adapter supports the first folding part of all battery cell groups, which is convenient for realizing the electrical connection between all battery cell bodies of the battery cell group and the pole body, and is beneficial to further reduce the number of adapters and simplify the structure of the battery single body.

[0035] In some embodiments, the adapter includes a main structure and multiple branch structures, the main structure is connected to the pole body, each branch structure is connected to an end of the main structure away from the pole body, and includes at least one level of branch segment, so that the adapter is constructed into a fractal tree structure, and each last level of branch segment of the branch structure supports a first folding portion.

[0036] In the above technical solution, by setting the adapter to be constructed into a fractal tree structure, the adapter can realize the electrical connection between all battery cell bodies and the pole body, and the adapter can connect a larger number of battery cell bodies, and the space occupied by the adapter is relatively small.

[0037] In some embodiments, the adapter includes a first connection portion, a bending portion and a second connection portion, the first connection portion and the second connection portion are opposite to each other, the bending portion is bent and connected between the first connection portion and the second connection portion, and at least a portion of the second connection portion is configured into multiple branch structures.

[0038] In the above technical solution, a bending portion is provided to be bent and connected between the first connection portion and the second connection portion, and at least a portion of the second connection portion is constructed into a plurality of branch structures, so that the second connection portion supports all the pole lug groups, thereby realizing electrical connection between all the pole lug groups and the pole body. The bent adapter can play a role of buffer support on the premise of realizing reliable support for the free end of the pole lug group, which is beneficial to reduce the risk of the battery cell components colliding with the shell components and improving the reliability of the battery cell.

[0039] In some embodiments, the connection position between the main structure and the branch structure is located in the middle of all the battery cell groups in the second direction.

[0040] In the above technical solution, by setting the connection position between the main structure and the branch structure at the middle position of all battery cell groups in the second direction, it is convenient to shorten the length of the branch structure while the branch structure reliably supports the tab group, which is beneficial to reducing the space occupied by the adapter.

[0041] In some embodiments, the number of cell bodies in a cell group is an odd number or an even number; and / or the number of cell bodies in multiple cell groups is equal or unequal.

[0042] In the above technical solution, the design of the battery cell group is flexible, which is convenient for improving the applicability and practicality of the battery cells.

[0043] In some embodiments, the battery cell further includes: an insulating component disposed in the accommodating cavity and having a through hole, the insulating component blocking the portion of the tab group and / or adapter that passes through the through hole to the side of the insulating component away from the battery cell body and the battery cell body.

[0044] In the above technical scheme, the insulating component can be used to isolate the battery cell body from the first shell wall of the shell component, reducing the probability of contact between the battery cell body and the first shell wall of the shell component, thereby reducing the risk of the first shell wall of the shell component being corroded due to leakage of the battery cell body, reducing the risk of failure of the battery cell body itself, and reducing the risk of leakage, thereby improving the reliability and stability of the battery cell; and the insulating component blocks the part of the conductive part that is penetrated through the hole to the side of the insulating component away from the battery cell body and the battery cell body, so as to separate the part of the conductive part that is penetrated to the side of the insulating component away from the battery cell body from the battery cell body, reducing the probability of the conductive part being inserted upside down into the battery cell body due to redundancy, etc., thereby reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell.

[0045] In some embodiments, the insulating component includes: an insulating film that fully covers the battery cell body, a perforation is formed on the insulating film at a position opposite to the first shell wall, and a portion of the insulating film surrounding the perforation is blocked between the portion of the tab group that penetrates through the perforation to the insulating film on the side facing the pole body and the battery cell body.

[0046] In the above technical scheme, since the portion of the insulating film surrounding the perforation is blocked between the portion of the tab group that is penetrated through the perforation to the insulating film on the side facing the pole body and the battery cell body, it is convenient to make the size of the perforation on the insulating film adaptable to the size of the tab group, for example, the size of the first avoidance hole is adapted to the thickness size of the portion of the tab group located at the first avoidance hole. On the one hand, the perforation allows the tab group to be smoothly penetrated to be electrically connected to the pole body. On the other hand, when the tab group is penetrated in the perforation, the insulating film can still cover the multiple tab sheets of the tab group adjacent to the root of the battery cell body, further realizing insulation protection for the battery cell body and reducing the risk of bare leakage of the battery cell body. At the same time, the portion of the tab group that passes through the perforation can be separated from the battery cell body, reducing the probability of the tab group and / or adapter being inserted into the battery cell body due to redundancy, and the tab group adjacent to the root of the battery cell body, which is beneficial to further reduce the risk of short circuit in the battery cell.

[0047] In some embodiments, the insulating component includes: an insulating bracket, which is arranged on the side of the battery body facing the first shell wall, and a through hole is formed in the insulating bracket at a position opposite to the pole component, and the part of the insulating bracket surrounding the through hole is blocked between the adapter and the battery body.

[0048] In the above technical solution, since the insulating bracket surrounds the perforated part and blocks the adapter and the battery cell body, the insulating bracket can play a certain supporting role on the adapter, and the adapter supports the free end of the pole tab group. The insulating bracket can insulate and separate the free end of the pole tab group from the battery cell body, reducing the probability of the free end of the pole tab group being inserted upside down into the battery cell body and the probability of the pole tab group being inserted upside down into the root of the adjacent battery cell body, reducing the risk of short circuit and improving the reliability of the battery cell.

[0049] In some embodiments, the pole component further includes a transition structure and an insulating structure, the transition structure surrounds the pole body and is connected to the first shell wall, and the insulating structure is insulated and fitted between the transition structure and the pole body.

[0050] In the above technical solution, the structure of the pole component is simple and easy to process. Moreover, since it includes two parts, namely the pole body and the adapter structure, the shape and size of the pole body and the shape and size of the adapter structure can be separately designed based on different factors, so as to flexibly adapt to the connection requirements with different forms of shell components and battery cell components, thereby increasing the scope of application of the pole component.

[0051] In some embodiments, the insulating structure includes a sealing structure, which is arranged around the peripheral side of the transition structure facing the pole body and is at least partially clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall.

[0052] In the above technical solution, by setting at least part of the sealing structure to be clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall, an axial seal between the transition structure and the pole body is achieved. The axial seal can achieve a more reliable sealing effect and improve the leakage problem at the matching position of the transition structure and the pole body. The embodiment of the present application can reduce the axial force on the first shell wall by integrating the axial seal into the pole component. Moreover, by setting the sealing structure ring on the inner ring of the transition structure, the sealing structure can be close to the matching position of the transition structure and the pole body, which is conducive to sealing the matching position of the transition structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily achieving compression sealing on it. The seal is not easy to fail, and the sealing effect is improved.

[0053] In some embodiments, the pole body includes a peripheral portion, and the transition structure is clamped on both sides of the peripheral portion in the inner and outer directions of the first shell wall through the insulating structure, and at least part of the sealing structure is clamped between the side of the peripheral portion facing the battery core component and the transition structure.

[0054] In the above technical solution, the structure of the pole component is simple and easy to process, and the relative fixation and insulation matching between the pole body and the adapter structure can be simply and effectively achieved. The peripheral portion of the pole body and the adapter structure are used to clamp the sealing structure, so that the sealing structure can be in the matching position of the adapter structure and the pole body, which is conducive to sealing the matching position of the adapter structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily achieving compression sealing on it. The seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure is clamped between the side of the peripheral portion facing the battery core component and the adapter structure, the sealing structure can be sealed from the side of the peripheral portion facing the accommodating cavity, which can more effectively inhibit the leakage of electrolyte from the matching position of the pole body and the adapter structure, thereby improving the sealing effect.

[0055] In some embodiments, the transition structure includes a mating ring portion, the pole body includes a penetration portion passing through the mating ring portion, and an inner limit portion and an outer limit portion connected to the penetration portion and clamped on both sides of the mating ring portion, and at least a portion of the sealing structure is clamped between the mating ring portion and the inner limit portion.

[0056] In the above technical solution, the structure of the pole component is simple and easy to process, and the relative fixation and insulation matching between the pole body and the adapter structure can be simply and effectively achieved. The sealing structure is clamped by the matching position of the pole body and the matching ring part, so that the sealing structure can be in the matching position of the adapter structure and the pole body, which is conducive to sealing the matching position of the adapter structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily achieving compression sealing on it. The seal is not easy to fail, and the sealing effect is improved. Moreover, since at least part of the sealing structure is clamped between the matching ring part and the inner limit part, the sealing structure can be sealed from the side of the matching ring part facing the accommodating cavity, which can more effectively inhibit the leakage of electrolyte from the matching position of the pole body and the adapter structure, thereby improving the sealing effect.

[0057] In some embodiments, the pole component forms a receiving groove that is recessed relative to the first shell wall in a direction away from the battery core component and open in a direction toward the battery core component, and at least a portion of the adapter is received in the receiving groove.

[0058] In the above technical solution, by providing a receiving groove to receive the adapter, the space occupied by the adapter in the receiving chamber can be reduced, so that the receiving chamber has a larger space to receive the battery body, which is beneficial to increase the volume of the battery body, thereby increasing the energy density of the battery cell. Moreover, since the receiving groove is open toward the direction of the battery component, the adapter can be easily inserted into the receiving groove, reducing the difficulty of operation.

[0059] In some embodiments, the shell component includes a shell body and a shell cover, the shell body is an integral piece and one end is open, the shell cover is arranged at the open end of the shell body, and the end of the shell body opposite to the shell cover is the first shell wall; or, the shell cover is the first shell wall.

[0060] In the above technical solution, the structural design of the shell component is flexible, and the arrangement position of the pole component is flexible.

[0061] In some embodiments, the battery cell further includes: a pressure relief component, which is disposed on the shell component and is located on the same side or on the opposite side as the pole component.

[0062] In the above technical solution, when the pressure relief component and the pole component are located on the same side, the design of other shell walls other than the first shell wall can be simplified, and the structure and processing of the battery cell can be simplified. When the pressure relief component and the pole component are located on different sides, there is no need to consider the space occupied by the pressure relief component on the first shell wall, and the volume of the pole component is reduced, so that the shape and volume of the pole component can be flexibly designed according to needs.

[0063] In the second aspect, an embodiment of the present application provides a processing method, which is used to process the above-mentioned battery cell, and the processing method includes: loading the battery cell component into the accommodating cavity, and arranging one end of the battery cell component where the pole tab group is arranged on the inner side of the first shell wall and opposite to the first shell wall; installing the pole column component on the first shell wall, and connecting the pole tab group to the pole column body through an adapter, and allowing the adapter to support the free end of the pole tab group.

[0064] In the above technical solution, by making the adapter support the free end of the tab group during the assembly process, the free end can be prevented from moving toward the battery cell body, thereby reducing the risk of the tab group moving toward the battery cell body and causing a short circuit due to the inverted insertion of the battery cell body, which is beneficial to improving the reliability of the battery cell.

[0065] In some embodiments, the first shell wall is formed with a mounting hole; the steps of mounting the pole component on the first shell wall, connecting the pole lug group to the pole body through an adapter, and allowing the adapter to support the free end of the pole lug group include: connecting one end of the adapter to the pole lug group, and passing the other end through the mounting hole to the outside of the first shell wall to connect to the pole body; covering the pole component connected with the adapter on the mounting hole from the inside or outside of the first shell wall; or, mounting the pole component on the first shell wall, connecting the pole lug group to the pole body through an adapter, and allowing the adapter to support the free end of the pole lug group to prevent the free end from moving toward the battery cell body include: placing the battery cell component on the inside of the first shell wall, connecting one end of the adapter to the pole lug group, and the other end to the pole body; covering the pole component connected with the adapter on the mounting hole from the inside or outside of the first shell wall after passing the mounting hole.

[0066] In the above technical solution, one end of the adapter is first connected to the pole lug group, and then the other end of the adapter is passed through the mounting hole to the outside of the first shell wall to connect with the pole body. Since the adapter is not yet connected to the pole component when passing through the mounting hole, it is convenient for the adapter to pass through the mounting hole, thereby improving the convenience of operation; and since the welding position of the pole component and the adapter is located on the outside of the first shell wall, it can improve the problem of conductive shavings formed during welding entering the inside of the shell body and damaging the battery cell component. The adapter is first connected to the pole component, and then the pole component is installed on the first shell wall. Since the battery cell component and the pole component are first connected, and then the pole component is passed through the mounting hole, it is not necessary to consider the problem of avoiding the first shell wall when connecting the battery cell component 3 and the pole component, or in other words, when connecting the battery cell component and the pole component, the pole component and the battery cell component are not located on both sides of the first shell wall, which is conducive to further shortening the length of the conductive part, reducing the redundancy of the conductive part after assembly, reducing the risk of reverse insertion, and improving the reliability of the battery cell. Moreover, since the welding position of the pole component and the battery core component is located outside the shell body, the problem of conductive scraps formed during welding entering the inside of the shell body and damaging the battery core component can be improved. In addition, since the pole component is covered on the mounting hole from the outside of the first shell wall, the transition structure stops at the outside of the first shell wall, and the transition structure is connected to the first shell wall from the outside of the first shell wall, so as to facilitate the assembly and connection of the pole component and the first shell wall, which is conducive to improving the connection reliability of the pole component and the first shell wall.

[0067] In some embodiments, the tab group includes a plurality of tab sheets; before connecting the tab group to the adapter, the plurality of tab sheets are gathered together to form a stacked portion at the free end; the step of connecting one end of the adapter to the tab group includes: connecting the plurality of tab sheets of the tab group at the stacked portion position to form a first gathered portion, connecting at least a portion of the first gathered portion to the adapter; or, connecting at least a portion of the stacked portion to the adapter.

[0068] In the above technical solution, the laminated part is pre-connected first, so that the laminated part forms a first gathered part with a certain rigidity, rather than a fluffy and scattered multi-layer foil form, which facilitates the connection between the first gathered part and the adapter, and makes the welding between the pole ear part and the adapter more reliable, and it is not easy to form pores in the weld, which can improve the connection reliability and conductivity of the welding point, and make the conductivity of the battery cell component and the pole component more stable and reliable. The laminated part does not need to be pre-connected, and the laminated part is directly connected to the adapter, which is conducive to simplifying the processing process and improving the processing efficiency. When the laminated part is connected to the adapter, the laminated part forms the first gathered part, which can also achieve a reliable connection between the laminated part and the adapter.

[0069] In some embodiments, the end of the adapter away from the pole body has a clamping structure and includes two oppositely arranged clamping parts; the step of connecting one end of the adapter to the pole lug group includes: clamping the free end with two clamping parts from both sides of the free end; connecting both clamping parts to the free end.

[0070] In the above technical solution, the two clamping parts can protect the free end, so as to improve the problem that the free end is easy to crack during the connection process with the clamping structure, and improve the connection reliability between the adapter and the tab group.

[0071] In some embodiments, the adapter includes multiple adapter foils; before connecting one end of the adapter to the pole lug group, it also includes: stacking multiple adapter foils; connecting the stacked partial areas to form a first connection portion; the steps of connecting one end of the adapter to the pole lug group and the other end to the pole body include: connecting the stacked partial areas of the multiple adapter foils to the free end so that the stacked partial areas form a second connection portion spaced apart from the first connection portion; connecting the first connection portion to the pole body.

[0072] In the above technical solution, the stacked partial areas are connected to form the first connection part, so as to realize the connection of multiple adapter foils, improve the compactness of the adapter foil at the first connection part, and facilitate the connection of the adapter and the pole component. "Connecting multiple adapter foils to the free end" and "connecting the stacked partial areas of multiple adapter foils to form the second connection part" can be carried out at the same time, which is conducive to simplifying the processing process.

[0073] In some embodiments, the pole component connected with the adapter is covered on the mounting hole from the inner side or the outer side of the first shell wall, or the pole component connected with the adapter is passed through the mounting hole and then covered on the mounting hole from the inner side or the outer side of the first shell wall: when the pole component is installed on the first shell wall, the part located between the first shell wall and the battery cell body after the connection between the tab group and the adapter is bent.

[0074] In the above technical scheme, the conductive part formed by the pole lug group and the adapter can play a buffering role. When the battery cell is used in a vibration environment, the impact of the battery cell body toward the first shell wall can be reduced, thereby protecting the battery cell components and improving the reliability of the battery cell. In addition, the pole column component is installed before the first shell wall, and the part located between the first shell wall and the battery cell body after the pole lug group and the adapter are connected can be basically in an expanded state, which is convenient for connecting the pole lug group with the adapter and / or the adapter with the pole column body, and is convenient for having sufficient operating space, for example, it is convenient to lay the part of the adapter connected to the pole column body on the pole column body for connection.

[0075] In some embodiments, the battery cell includes an insulating bracket located on the inner side of the first shell wall; when the pole component is installed on the first shell wall, the step of making the portion located between the first shell wall and the battery cell body after the pole lug group and the adapter are connected to be bent includes: when the pole component is installed on the first shell wall, the portion located between the first shell wall and the battery cell body after the pole lug group and the adapter are connected is bent to form a first open groove, and the free end defines at least a portion of the groove wall on one side of the first open groove close to the pole body; a portion of the insulating bracket is inserted into the first open groove.

[0076] In the above technical solution, the insulating bracket can prevent the free end from moving toward the battery cell body, which is beneficial to further reduce the risk of the tab group moving toward the battery cell body and causing a short circuit due to the inverted insertion of the battery cell body, and is beneficial to improving the reliability of the battery cell.

[0077] In some embodiments, the battery cell includes an insulating bracket located on the inner side of the first shell wall; when the pole component is installed on the first shell wall, the step of making the portion located between the first shell wall and the battery cell body after the pole lug group and the adapter are connected to be bent includes: when the pole component is installed on the first shell wall, the portion located between the first shell wall and the battery cell body after the pole lug group and the adapter are connected is bent to form a first opening groove, and a second opening groove adjacent to the first opening groove and located on the side of the first opening groove facing the pole body, the opening directions of the second opening groove and the first opening groove are arranged at an angle; part of the insulating bracket is inserted into the first opening groove and the second opening groove.

[0078] In the above technical solution, the insulating bracket can prevent the free end from moving toward the battery cell body, and the insulating bracket can also prevent the adapter from moving toward the battery cell body, which is beneficial to further reduce the risk of reverse insertion and improve reliability.

[0079] In some embodiments, the step of connecting the other end of the adapter to the pole body includes: adjusting the angle of the pole component so that the normal of the inner end surface of the pole body is close to the stacking direction of multiple battery cell bodies, and the step of covering the pole component connected with the adapter on the mounting hole includes: adjusting the angle of the pole component on the outer side of the first shell wall so that the normal of the inner end surface of the pole body is close to perpendicular to the stacking direction of multiple battery cell bodies, and the pole ear group is bent and deformed to form a first open groove, and the adapter is bent and deformed to form a second open groove, and the opening directions of the first open groove and the second open groove are arranged at an angle.

[0080] In the above technical solution, the position and angle of the pole component are first adjusted so that the normal direction of the inner end face of the pole body is close to the stacking direction of multiple battery cell assemblies, and then the part of the adapter connected to the pole body is laid on the inner end face of the pole body. After that, there is no need to adjust the angle of the pole body, so that there is enough space near the matching position of the part of the adapter connected to the pole body and the inner end face of the pole body for welding the adapter and the pole body, thereby simplifying the operation and making the length of the pole ear shorter. Then, when adjusting the angle of the pole component to connect with the first shell wall, the conductive part can be bent to form the first opening groove and the second opening groove.

[0081] In some embodiments, the shell component includes a shell body and a shell cover, and the shell body has an opening; when the end wall of the shell body opposite to the opening is the first shell wall, the steps of loading the battery core component into the accommodating cavity and arranging the battery core component on the inner side of the first shell wall and opposite to the first shell wall include: loading the battery core component into the accommodating cavity from the opening; extending the pole lug group from the mounting hole so that one end of the battery core component where the pole lug group is arranged is arranged on the inner side of the first shell wall and opposite to the first shell wall; closing the shell cover on the opening; when the shell cover is the first shell wall, the steps of loading the battery core component into the accommodating cavity and arranging one end of the battery core component where the pole lug group is arranged is arranged on the inner side of the first shell wall and opposite to the first shell wall include: supporting the battery core component on the inner side of the shell cover; extending the pole lug group from the mounting hole so that one end of the battery core component where the pole lug group is arranged is arranged on the inner side of the first shell wall and opposite to the first shell wall; sleeve the shell body on the outer side of the battery core component and connect it to the shell cover.

[0082] In the above technical solution, by arranging the pole component at the end of the shell body opposite to the opening, it is helpful to improve the cracking problem at the connection between the shell body and the shell cover, and improve the reliability of the battery cell. By first completing the connection between the shell body and the shell cover, and then connecting the pole component to the shell cover, the shell body can be used to store the battery core components and support the shell cover, which is convenient for positioning and supporting the shell cover, so as to facilitate the connection between the shell cover and the adapter structure, and improve the connection reliability between the shell cover and the pole component.

[0083] In some embodiments, when the end wall of the shell body opposite to the opening is the first shell wall, before the battery cell component is loaded into the accommodating cavity from the opening, it also includes wrapping an insulating film around the outside of the battery cell body; when the shell cover is the first shell wall, before the shell body is sleeved on the outside of the battery cell component, it also includes wrapping an insulating film around the outside of the battery cell body.

[0084] In the above technical solution, the battery cell component and the insulating film are put into the shell together, which is convenient for the arrangement of the insulating film and the insulation arrangement of the battery cell component and the shell component.

[0085] In a third aspect, an embodiment of the present application provides a battery, comprising the above-mentioned battery cell.

[0086] In the above technical solution, the performance of the battery can be improved by adopting the above battery monomer.

[0087] In some embodiments, the battery includes a box body, a plurality of battery cells are accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole is arranged on the side of the shell component facing the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

[0088] In the above technical solution, when the pole component of the battery cell is arranged on the side of the shell component facing the bottom plate of the box body, the battery cell is in an inverted state, and the decompression product is sprayed in the direction away from the passenger compartment, which is safer; when the pole component of the battery cell is arranged on the side of the shell component facing away from the bottom plate of the box body, the battery cell is in an upright state, and the electrolyte is not easy to leak; therefore, the flexible setting of the orientation of the battery cell and the box body can be achieved.

[0089] In a fourth aspect, an embodiment of the present application provides an electrical device comprising the above-mentioned battery.

[0090] In the above technical solution, since the performance of the battery is improved, it is beneficial to improve the working power performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0092] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0093] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0094] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0095] Figure 4 for Figure 3 An exploded view of a battery cell shown in ;

[0096] Figure 5 An exploded view of a battery cell provided for some embodiments of the present application;

[0097] Figure 6 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0098] Figure 7 for Figure 6 A partial schematic diagram of a battery cell shown;

[0099] Figure 8 A schematic diagram of an adapter provided in some embodiments of the present application;

[0100] Fig. 9 A schematic diagram of an adapter provided in some embodiments of the present application;

[0101] Fig.10 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0102] Fig.11 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0103] Fig.12 A cross-sectional view of a battery cell provided in some embodiments of the present application, in which the pole component is in a state before being covered by the first shell wall;

[0104] Fig.13 A cross-sectional view of a battery cell provided in some embodiments of the present application, in which the pole component is in a state before being covered by the first shell wall;

[0105] Fig.14 A cross-sectional view of a battery cell provided in some embodiments of the present application, in which the pole component is in a state before being covered by the first shell wall;

[0106] Fig.15 A schematic diagram of the coating of the insulating film provided in some embodiments of the present application;

[0107] Fig.16 A schematic diagram of the coating of the insulating film provided in some embodiments of the present application;

[0108] Fig.17 A schematic diagram of an insulating bracket provided in some embodiments of the present application;

[0109] Fig.18 for Fig.17 The assembly diagram of the insulating bracket shown in ;

[0110] Fig.19 A schematic diagram of an insulating bracket provided in some embodiments of the present application;

[0111] Fig. 20 for Fig.19 The assembly diagram of the insulating bracket shown in ;

[0112] Fig.21 A schematic diagram of a pole component provided for some embodiments of the present application;

[0113] Fig. 22 for Fig.21 Another schematic diagram of the pole assembly shown in ;

[0114] Fig.23 for Fig. 22 The view from direction B shown in FIG.

[0115] Fig.24 for Fig. 22 Cross-sectional view of CC;

[0116] Fig.25 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0117] Fig.26 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0118] Fig. 27 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0119] Fig.28 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0120] Fig.29 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0121] Fig.30 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0122] Fig.31 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, in which the pole component is in a state before being covered by the first shell wall;

[0123] Fig.32 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0124] Fig.33 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0125] Fig.34 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0126] Fig.35 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0127] Fig.36 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0128] Figure 37A-Figure 37E This is a schematic diagram of the processing decomposition of some embodiments of the present application;

[0129] Fig.38 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0130] Figure 39A-Figure 39D This is a schematic diagram of the processing decomposition of some embodiments of the present application;

[0131] Fig.40 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0132] Fig.41 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0133] Fig.42 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0134] Fig.43 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0135] Fig.44 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0136] Fig.45 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0137] Fig.46 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0138] Fig.47 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0139] Fig.48 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0140] Fig.49 A flow chart of a method for processing a battery cell according to some embodiments of the present application;

[0141] Figure 50A-50F This is a schematic diagram of the processing decomposition of some embodiments of the present application.

[0142] Reference numerals:

[0143] Electric device 1000; battery 100; controller 200; motor 300; housing 101; first housing portion 1011; second housing portion 1012; battery cell 102; first direction F1; second direction F2; third direction F3; fifth direction F5; sixth direction F6; housing component 1; housing body 11; first housing wall 111; first sink 1111; overlap portion 1112; mounting hole 112; opening 113; second housing wall 114; housing cover 12; accommodating cavity 13; sealing ring 14; pole component 2; pole body 21; Inner end surface 211; outer end surface 213; penetration portion 214; riveted portion 2141; inner limit portion 215; outer limit portion 216; first pole piece 21a; second pole piece 21b; matching hole 21b1; adapter structure 22; inner end surface 220 of the adapter structure; surrounding area 2201; flange portion 22a; second sinking groove 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 2 25; fourth adapter ring 227; matching ring portion 2271; third insulating frame 228; insulating structure 23; sealing structure 231; axial side portion 231a; first insulating member 232; second insulating member 234; insulating sealing member 24; battery cell component 3; battery cell assembly 31; pole ear sheet 311; lamination portion 312; battery cell body 32; battery cell group 32A; pole ear group 33; free end 331; first gathering portion 332; second gathering portion 333; first opening groove 334; axial section 34 of battery cell component; adapter 35; adapter foil 350; first transfer foil 3501; second transfer foil 3502; first connection part 351; second connection part 352; bending part 353; second groove 3531; third connection part 354; second opening groove 355; clamping structure 356; clamping part 3561; main structure 357; branch structure 358; branch section 3581; insulating component 4; perforation 40; insulating film 41; tearing structure 411; insulating bracket 42; bracket body 421; first separator 422; accommodating groove 5; pressure relief component 6; binding piece 8. DETAILED DESCRIPTION

[0144] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0145] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0146] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0147] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0148] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0149] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0150] The term "plurality" used in the present application refers to two or more (including two).

[0151] In the present application, battery cells 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 the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0152] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may be a battery module or a battery pack. A battery module generally includes a plurality of battery cells. The battery generally includes a casing for encapsulating one or more battery cells, or one or more battery modules, and the casing can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells; of course, the battery may not include a casing.

[0153] Exemplarily, a battery cell may generally include a shell component, a cell component and an electrolyte (in a solid-state battery, it may be a solid electrolyte layer located between the positive and negative electrodes). The shell is used to accommodate the cell component and the electrolyte, and at least one positive electrode column and at least one negative electrode column are provided on the shell. The cell component includes one or more cell assemblies, and the cell assembly is formed by stacking or winding a positive electrode sheet, a negative electrode sheet and a separator (this structure may be omitted in a solid-state battery). The material of the shell component is not limited, for example, including but not limited to aluminum shell, steel shell, aluminum-plastic film, plastic or other materials resistant to electrolyte corrosion.

[0154] Among them, the positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet, and a plurality of positive electrode tab sheets are stacked together and electrically connected to the positive electrode column. Exemplarily, the plurality of stacked positive electrode tab sheets can be directly welded to the positive electrode column to form an electrical connection; or, the battery cell assembly can also include a positive electrode adapter, the plurality of stacked positive electrode tab sheets are welded to one end of the positive electrode adapter, and the other end of the positive electrode adapter is welded to the positive electrode column, so that the positive electrode tab sheet is electrically connected to the positive electrode column.

[0155] The negative electrode sheet can generally include a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab sheet, and a plurality of negative electrode tab sheets are stacked together and electrically connected to the negative electrode column. Exemplarily, a plurality of negative electrode tab sheets stacked together can be directly welded to the negative electrode column to form an electrical connection; or, the battery cell assembly can also include a negative electrode adapter, a plurality of negative electrode tab sheets stacked together are welded to one end of the negative electrode adapter, and the other end of the negative electrode adapter is welded to the negative electrode column, so that the negative electrode tab sheet is electrically connected to the negative electrode column. The material of the separator is not limited, for example, it can be polypropylene or polyethylene.

[0156] The pressure relief component on the battery cell mentioned in the present application is used to release the gas inside the battery cell when the internal pressure of the battery cell is too high (for example, due to overcharging, etc.), so as to reduce the internal pressure of the battery cell and prevent the internal pressure of the battery cell from being too quickly pressurized, causing the battery cell to explode, etc. For example, the pressure relief component can be an explosion-proof valve, an explosion-proof plate, etc.

[0157] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role. Among them, batteries, as the core of new energy vehicles, have high requirements in terms of reliability.

[0158] In the related art, the tabs of the battery cells are easily inserted upside down into the battery cell body, which causes the battery cells to be short-circuited. The reliability of the battery cells needs to be improved, which hinders the further improvement of the reliability of the battery.

[0159] Based on the above considerations, a battery cell is proposed, which includes a shell component, a pole component and a cell component. The shell component has a accommodating cavity and includes a first shell wall that participates in defining the accommodating cavity. The pole component is installed on the first shell wall, and the pole component includes a pole body. The cell component includes a cell body and an adapter. The cell body is arranged in the accommodating cavity and is connected to a pole lug group at its end. The pole lug group is electrically connected to the pole body through the adapter, and the adapter supports the free end of the pole lug group.

[0160] In the above technical solution, by arranging the pole lug group to be electrically connected to the pole column body through the adapter, and making the adapter support the free end of the pole lug group, the length of the pole lug group can be shortened and the redundancy of the pole lug group can be improved, which is beneficial to improving the problems of wrinkling, bending and breaking of the pole lug sheets of the pole lug group. At the same time, the support of the free end by the adapter is beneficial to reduce the risk of short circuit caused by the free end of the pole lug group being inserted into the inside of the battery body, or inserted into the root position of the pole lug group adjacent to the battery body, thereby improving the reliability of the battery cell.

[0161] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries including battery cells, and electrical devices using batteries.

[0162] The electrical device may be, but is not limited to, a vehicle, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc., the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc.

[0163] For the convenience of description, the following embodiments are described by taking the electric device 1000 as a vehicle as an example.

[0164] Please refer to Figure 1 , Figure 1 The power consumption device 1000 provided for some embodiments of the present application is a structural schematic diagram of a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The vehicle is provided with a battery 100, and the battery 100 can be arranged at the bottom, head or tail of the vehicle. The battery 100 can be used to power the vehicle, for example, the battery 100 can be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery 100 can be used not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0165] Please refer to Figure 2 , Figure 2 An exploded view of the structure of a battery 100 provided for some embodiments of the present application. The battery 100 includes a case 101 and a plurality of battery cells 102, and the battery cells 102 are accommodated in the case 101. Among them, the case 101 is used to provide an assembly space for the battery cells 102, and the case 101 can adopt a variety of structures. In some embodiments, the case 101 may include a first box portion 1011 and a second box portion 1012, and the first box portion 1011 and the second box portion 1012 cover each other, and the first box portion 1011 and the second box portion 1012 jointly define a accommodating cavity for accommodating the battery cells 102. A sealing member can also be provided at the connection position between the first box portion 1011 and the second box portion 1012 to achieve a sealed connection between the first box portion 1011 and the second box portion 1012.

[0166] For example, refer to Figure 2 , the first box part 1011 and the second box part 1012 can also be hollow structures with one side open, and the open side of the first box part 1011 covers the open side of the second box part 1012 to form a box body 101 with a storage space. For another example, the second box part 1012 can be a hollow structure with one end open, the first box part 1011 can be a plate-like structure, and the first box part 1011 covers the open side of the second box part 1012, so that the first box part 1011 and the second box part 1012 jointly define a storage cavity. Of course, the box body 101 formed by the first box part 1011 and the second box part 1012 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0167] In the battery 100, there may be one or more battery cells 102; when there are more than one battery cell 102, the multiple battery cells 102 may be connected in series, in parallel or in a mixed connection, and a mixed connection means that the multiple battery cells 102 are both connected in series and in parallel. The multiple battery cells 102 may be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the multiple battery cells 102 is accommodated in the box 101; or, the battery 100 may also be a battery module formed by connecting multiple battery cells 102 in series, in parallel or in a mixed connection, and then the multiple battery modules are connected in series, in parallel or in a mixed connection to form a whole, and accommodated in the box 101. The battery 100 may also include other structures, for example, the battery 100 may also include a converging component for realizing electrical connection between the multiple battery cells 102.

[0168] Please refer to Figure 3-Figure 5 , Figure 3 A schematic diagram of the structure of a battery cell 102 provided in some embodiments of the present application, Figure 4 for Figure 3 The exploded view of the battery cell shown in Figure 5 An exploded view of a battery cell provided for some embodiments of the present application. The battery cell 102 is a rectangular parallelepiped, the height direction of the battery cell 102 is the first direction F1, the thickness direction of the battery cell 102 is the second direction F2, the width direction of the battery cell 102 is the third direction F3, and the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other. However, it is not limited to this. In other embodiments of the present application, the battery cell 102 can also be a polygonal prism, a flat body or other shapes. The fourth direction F4 described below can be parallel to the second direction, and the fifth direction F5 can be parallel to the first direction.

[0169] Please refer to Figure 6-Figure 7 , Figure 6 A cross-sectional view of a battery cell 102 provided in some embodiments of the present application, Figure 7 For along Figure 6A partial schematic diagram of a battery cell 102 is shown in FIG. In the embodiment of the present application, the battery cell 102 includes a housing component 1 , a pole component 2 and a cell component 3 .

[0170] The pole component 2 is installed on the shell component 1. The shell component 1 has a accommodating cavity 13, and the shell component 1 includes a first shell wall 111. The first shell wall 111 participates in defining the accommodating cavity 13, and the pole component 2 is installed on the first shell wall 111; illustratively, the first shell wall 111 has a mounting hole 112, and the pole component 2 is arranged at the mounting hole. Among them, "the pole component 2 is installed on the first shell wall 111" means that there is an assembly connection relationship between the pole component 2 and the first shell wall 111, for example, welding or riveting. Therefore, the shell component 1 and the pole component 2 are separate parts, and the two are assembled and connected, so that the shell component 1 can be processed separately, and the pole component 2 can be processed separately, which is convenient for the processing of the two, and at the same time, it is conducive to the processing and manufacturing of the battery cell 102.

[0171] The cell component 3 includes a cell body 32, which is disposed in the accommodating cavity 13, and a tab group 33 is connected to the end of the cell body 32, and the tab group 33 is electrically connected to the pole body 21. Exemplarily, the cell component 3 includes one or more cell assemblies 31, each cell assembly 31 includes a cell body 32 and a tab group 33, the portion of the current collector in the cell assembly 31 coated with the active material layer constitutes the cell body 32, and the portion not coated with the active material layer constitutes the tab group 33, the tab group 33 corresponds to the cell body 32 one by one, and the tab group 33 may include a multilayer tab sheet 311.

[0172] The cell component 3 further includes an adapter 35, and the tab group 33 is electrically connected to the pole body 21 through the adapter 35. Exemplarily, the battery 100 further includes a busbar component located outside the battery cell 102, and the busbar component is connected to the pole body 21 to form electrical conduction, so as to realize electrical connection of multiple battery cells 102 through the busbar component. Thus, the pole lug group 33 and the pole column body 21 are indirectly connected through the adapter 35 to form electrical conduction, which can shorten the length of the pole lug group 33 and improve the redundancy of the pole lug group 33, which is beneficial to improving the problems of wrinkling, bending and breaking of the pole lug sheet 311 of the pole lug group 33. At the same time, since the pole lug group 33 is relatively short and the adapter 35 has certain restrictions on the pole lug group 33 due to its connection with the pole lug group 33, it is beneficial to reduce the risk of short circuit caused by the pole lug group 33 being inserted in reverse into the battery cell body 32. The shape and material of the adapter 35 can be flexibly designed to reduce the difficulty of connecting the adapter 35 with the pole column body 21 and the difficulty of connecting the adapter 35 with the pole lug group 33, which is beneficial to improving the assembly convenience of the battery cell 102.

[0173] In addition, the perforation 40 operation of the adapter 35, the connection operation between the adapter 35 and the pole component 2 (which may also be omitted), and the connection operation between the pole component 2 and the shell component 1 are not likely to cause cracks in the connection position between the battery cell body 32 and the tab group 33, thereby improving the reliability of the battery cell 102.

[0174] Exemplarily, when the pole component 2 is a negative pole, the pole body 21 can be an aluminum-copper composite, wherein the copper-aluminum composite can include an aluminum part and a copper part, and the two parts are connected by a physical connection method. The aluminum part is arranged on the side of the copper part away from the battery cell body 32, and is easy to form a reliable connection with the aluminum busbar component, and the copper part is easy to connect with the copper foil pole ear piece 311 of the negative pole or the negative pole adapter 35; and when the pole component 2 is a positive pole, the pole body 21 can be an aluminum part, and the aluminum part is easy to form a reliable connection with the aluminum busbar component, and the aluminum part is also easy to connect with the aluminum foil pole ear piece 311 of the positive pole or the positive pole adapter 35.

[0175] There is no specific restriction on the connection method between the adapter 35 and the pole lug group 33, and there is no specific restriction on the connection method between the adapter 35 and the pole body 21. For example, the adapter 35 and the pole body 21 can be connected by methods including but not limited to ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure fusion welding, brazing, riveting, punching, gluing, etc.

[0176] Combination Figure 7 The adapter 35 supports the free end 331 of the tab group 33. For example, a portion of the adapter 35 can be supported on the side of the free end 331 of the tab group 33 facing the battery body 32, or a portion of the adapter 35 can be supported on the side of the free end 331 of the tab group 33 away from the pole body 21, so that the free end 331 of the tab group 33 is located between the portion of the adapter 35 supporting the free end 331 of the tab group 33 and the inner end surface 211 of the pole body 21. The support setting can prevent the free end 331 of the pole tab group 33 from moving toward the battery cell body 32. For example, when the pole tab group 33 is subjected to external force so that the pole tab group 33 has a tendency to move toward the battery cell body 32, the adapter 35 can apply a reaction force to the free end 331 of the pole tab group 33 to hinder the movement trend of the pole tab group 33 toward the battery cell body 32, thereby reducing the risk of the pole tab group 33 moving toward the battery cell body 32 and causing a short circuit due to the inverted insertion of the battery cell body 32, which is beneficial to improving the reliability of the battery cell 102.

[0177] Among them, "the free end 331 of the tab group 33" can be understood as the end of the tab group 33 away from the battery core component 3 in the extension direction of the tab group 33. The tab group 33 has a first end and a second end in its extension direction. The first end is connected to the battery core component 3, and the second end is the free end 331 of the tab group 33; "the inner end surface 211 of the pole body 21" is the end surface of the pole body 21 facing the battery core component 3. In some examples, the inner end surface 211 of the pole body 21 is electrically connected to the adapter 35, which can reduce the difficulty of assembling and connecting the adapter 35 with the pole body 21, improve the processing efficiency, and compared with the connection of the adapter 35 with other parts of the pole body 21, it is conducive to shortening the length of the adapter 35 and saving materials and costs; of course, in other examples, the adapter 35 can also be electrically connected to other parts of the pole body 21.

[0178] In the above technical solution, by setting the pole lug group 33 to be electrically connected to the pole column body 21 through the adapter 35, and making the adapter 35 support the free end 331 of the pole lug group 33, the length of the pole lug group 33 can be shortened and the redundancy of the pole lug group 33 can be improved, which is beneficial to improving the problems of wrinkling, bending and breaking of the pole lug sheet 311 of the pole lug group 33. At the same time, the support of the free end 331 by the adapter 35 is beneficial to reduce the risk of short circuit caused by the free end 331 of the pole lug group 33 being inserted into the inside of the battery cell body 32 or inserted into the root position of the pole lug group 33 adjacent to the battery cell body 32, thereby improving the reliability of the battery cell 102.

[0179] Please refer to Figure 7 In some embodiments of the present application, the tab group 33 includes a plurality of tab sheets 311, and the plurality of tab sheets 311 of the tab group 33 converge (i.e., gather toward each other) and are connected at a position away from the battery cell body 32 to form a first gathering portion 332 at the free end 331, and at least a portion of the first gathering portion 332 is connected to a portion of the adapter 35 at a position away from the battery cell body 32.

[0180] In the above technical solution, the first gathering portion 332 is provided to be connected to the adapter 35, and the first gathering portion 332 has a certain rigidity, so as to improve the connection reliability between the first gathering portion 332 and the adapter 35; and at least part of the first gathering portion 332 is connected to a side of a part of the adapter 35 away from the battery cell body 32, so that the above part of the adapter 35 can support at least part of the first gathering portion 332, and the multi-layer pole ear sheet 311 of the first gathering portion 332 is not easy to loosen, which can improve the supporting reliability of the adapter 35 to the free end 331.

[0181] In the above technical solution, the multiple tab sheets 311 of the tab group 33 are not only gathered together but also connected into an integrated structure when forming the first gathered portion 332. For example, the multiple tab sheets 311 of the tab group 33 can be connected into an integrated plate structure by welding (such as ultrasonic welding) to form the first gathered portion 332, and the multiple tab sheets 311 of the tab group 33 can also be gathered and connected to form the first gathered portion 332 by conductive adhesive bonding or other methods, which will not be described in detail here.

[0182] It should be noted that, in the embodiment of the present application, the pole tab sheets 311 are divided into the positive pole tab sheets 311 and the negative pole tab sheets 311. The positive pole tab sheets 311 that need to be gathered together are stacked together and connected (for example, ultrasonic pre-welding) to form the first gathered portion 332 of the positive electrode, which can reduce the interlayer gap of the free end 331 of the pole tab group 33, so that the fluffy multiple positive pole tab sheets 311 form a plate structure with a certain rigidity at the free end 331. Similarly, the negative pole tab sheets 311 that need to be gathered together are stacked together and connected (for example, ultrasonic pre-welding) to form the first gathered portion 332 of the negative electrode, which can reduce the interlayer gap of the free end 331 of the pole tab group 33, so that the fluffy multiple negative pole tab sheets 311 form a plate structure with a certain rigidity at the free end 331.

[0183] Please refer to Figure 7 In some embodiments of the present application, the adapter 35 includes a first connecting portion 351 and a second connecting portion 352. The first connecting portion 351 is connected to the pole component 2, and the second connecting portion 352 is connected to the first gathering portion 332. The second connecting portion 352 supports the first gathering portion 332. The second connecting portion 352 can not only realize the connection between the adapter 35 and the pole lug group 33, but also realize the support of the free end 331 of the pole lug group 33.

[0184] The orthographic projection of at least part of the first gathered portion 332 on the first shell wall 111 is within the orthographic projection range of the second connecting portion 352 on the first shell wall 111 , and the thickness t2 of the second connecting portion 352 is greater than or equal to the thickness t4 of the first gathered portion 332 .

[0185] In the above technical solution, by setting the orthographic projection of the supported part of the first gathering portion 332 on the first shell wall 111 to be located within the orthographic projection range of the second connection portion 352, and the thickness of the second connection portion 352 is greater than or equal to the thickness of the first gathering portion 332, the cross-sectional area of ​​the second connection portion 352 can be made greater than or equal to the cross-sectional area of ​​the first gathering portion 332, which is beneficial to reducing the resistance at the connection position between the second connection portion 352 and the first gathering portion 332, and improving the current flow capacity at the connection position between the second connection portion 352 and the first gathering portion 332, thereby facilitating reducing the internal resistance of the battery cell 102 and improving the current flow capacity of the battery cell 102.

[0186] Exemplarily, the first direction is perpendicular to the first shell wall 111, the surface where the first shell wall 111 is located is taken as the projection surface, and the first direction is taken as the projection direction. The orthographic projection of the part of the first gathering portion 332 supported by the adapter 35 is located within the orthographic projection range of the first connecting portion 352. Then, the size of the first gathering portion 332 in the second direction is less than or equal to the size of the second connecting portion 352 in the second direction, and the size of the first gathering portion 332 in the third direction is less than or equal to the size of the second connecting portion 352 in the third direction.

[0187] Please refer to Figure 7 In some embodiments of the present application, multiple pole tabs 311 of the pole tab group 33 converge near the battery body 32 to form a second gathering portion 333, one end of the second gathering portion 333 is bent and connected to the first gathering portion 332, and the other end of the second gathering portion 333 is connected to the battery body 32, and the end surface of the portion where the adapter 35 is connected to the first gathering portion 332 extends to a position close to the bending position of the second gathering portion 333.

[0188] In the above technical solution, the second gathering portion 333 is bent and connected to the first gathering portion 332, so that the tab group 33 can be bent to form the first opening groove 334. The first gathering portion 332 and the second gathering portion 333 are respectively the two side groove walls opposite to each other of the first opening groove 334. The end surface of the portion of the adapter 35 used to support the free end 331 extends to a position close to the bending position of the second gathering portion 333, so that the end surface of the portion of the adapter 35 used to support the free end 331 extends beyond the first gathering portion 332, so that the adapter 35 supports the entire first gathering portion 332.

[0189] In the above technical scheme, by setting one end of the second gathering portion 333 to be bent and connected to the first gathering portion 332, the end surface of the portion where the adapter 35 is connected to the first gathering portion 332 extends to a position close to the bending of the second gathering portion 333, so that the adapter 35 can support the entire first gathering portion 332 and improve the supporting reliability of the free end 331; at the same time, because the multiple pole ear sheets 311 of the pole ear group 33 are only gathered together but not connected when forming the second gathering portion 333, the adapter 35 can have a certain indirect pressure effect on the bending position of the second gathering portion 333, so as to improve the tightness of the second gathering portion 33, so that the second gathering portion 333 maintains the preset gathering shape and cannot be dispersed, which is beneficial to reduce the risk of the second gathering portion 333 being inserted upside down into the battery cell body 31.

[0190] In the embodiment of the present application, “the multiple tabs 311 of the tab group 33 converge and connect at a position close to the battery cell body 32 to form a first gathering portion 332, and the multiple tabs 311 of the tab group 33 converge at a position away from the battery cell body 32 to form a second gathering portion 333” is intended to illustrate that: along the extension direction of the tab 311, the second gathering portion 333 and the first gathering portion 332 are sequentially arranged along the direction away from the battery cell body 32, and the specific positions of the first gathering portion 332 and the second gathering portion 333 are not limited, that is, it is not required that the second gathering portion 333 is close to the battery cell body 32, nor is it required that the first gathering portion 332 is far from the battery cell body 32. In some optional examples, the current collector of the battery cell body 32 and the tab 311 can be an integral part, for example, for the positive electrode sheet, it can be an integrally formed aluminum foil, and for example, for the negative electrode sheet, it can be an integrally formed copper foil, and so on.

[0191] Please refer to Figure 7 In some embodiments of the present application, the tab group 33 is bent to form a first opening groove 334, and at least a portion of the tab group 33 is roughly formed into a C-shape, and the free end 331 defines at least a portion of a side groove wall of the first opening groove 334 close to the pole body 21, and the adapter 35 extends into the first opening groove 334, and the adapter 35 abuts against the free end 331.

[0192] In the above technical solution, by setting the adapter 35 to extend into the first open groove 334 formed by the bending of the pole ear group 33 and abut against the free end 331, the supporting reliability of the adapter 35 on the free end 331 can be improved. At the same time, the bent pole ear group 33 can play a buffering role. When the battery cell 102 is used in a vibration environment, the impact of the battery cell body 32 toward the first shell wall 111 can be reduced, thereby protecting the battery cell component 3 and improving the reliability of the battery cell 102.

[0193] It can be seen that in the embodiment of the present application, the tab group 33 can be bent to form one open slot or multiple open slots. When the tab group 33 is bent to form one open slot, the open slot is the first open slot 334; when the tab group 33 is bent to form multiple open slots, the multiple open slots include the first open slot 334 and the third open slot, and the opening directions of two adjacent open slots can be arranged at an angle, for example, the opening directions of two adjacent open slots are at an obtuse angle, or the opening directions of two adjacent openings are at an angle of 180°.

[0194] Please refer to Figure 7 In some embodiments of the present application, the adapter 35 is bent to form a second opening groove 355, the second opening groove 355 is adjacent to the first opening groove 334, and the second opening groove 355 is located on the side of the first opening groove 334 facing the pole body 21, and the opening directions of the second opening groove 355 and the first opening groove 334 are arranged at an angle.

[0195] It can be seen that in the direction from the pole body 21 to the battery cell body 32, the first opening groove 334 and the second opening groove 355 are arranged adjacent to each other (for example Figure 7 As shown, the first opening slot 334 and the second opening slot 355 are adjacent to each other vertically, the opening of the first opening slot 334 is generally facing left, and the opening of the second opening slot 355 is generally facing right).

[0196] Thus, the conductive part 4 composed of the tab group 33 and the adapter 35 can present a reciprocating serpentine shape, and the conductive part 4 can play a buffering role. When the battery cell 102 is used in a vibration environment, the impact of the battery cell body 32 toward the first shell wall 111 can be reduced, which plays a role in protecting the battery cell component 3 and improving the reliability of the battery cell 102. In addition, since the conductive part 4 does not extend randomly, the mutual interference and scratching between the tab pieces 311 in the conductive part 4 and the risk of the tab piece 311 being inserted into the live battery cell body 32 can be reduced, thereby further improving the reliability of the battery cell 102.

[0197] For example, please refer again to Figure 7 The tab assembly 33 includes a first folded portion 332 and a second folded portion 333 connected by bending, and the first folded portion 332 and the second folded portion 333 respectively form the groove walls on the opposite sides of the first opening groove 334; the adapter 35 includes a first connecting portion 351 and a second connecting portion 352 connected by bending, and the first connecting portion 351 and the second connecting portion 352 respectively form the groove walls on the opposite sides of the second opening groove 355. Thus, the conductive portion 4 can present a reciprocatingly bent S shape, thereby shortening the length of the conductive portion 4, simplifying the structure of the conductive portion 4, and facilitating the processing of the conductive portion 4.

[0198] Please refer to Figure 7-Figure 9 In some embodiments of the present application, the end of the adapter 35 away from the pole body 21 has a clamping structure 356, the clamping structure 356 supports the free end 331, and the clamping structure 356 includes two oppositely arranged clamping parts 3561, the free end 331 is clamped between the two clamping parts 3561, and the free end 331 is connected to each clamping part 3561, then the two clamping parts 3561 are respectively arranged on both sides of the thickness of the free end 331.

[0199] For example, one end of the adapter 35 having the clamping structure 356 may be substantially in a Y-shaped structure, and the two forks of the Y-shaped structure may respectively form two clamping portions 3561 , the free end 331 is clamped between the two forks, and the free end 331 is electrically connected to each fork.

[0200] In the above technical solution, by clamping the free end 331 between the two clamping parts 3561, the two clamping parts 3561 can be used to limit the free end 331 of the pole lug group 33, which is beneficial to improve the connection reliability of the multiple pole lug sheets 311 of the pole lug group 33 at the free end 331. At the same time, one of the two clamping parts 3561 that is arranged adjacent to the battery cell body 32 can support the free end 331 of the pole lug group 33, and support it on the side of the free end 331 of the pole lug group 33 away from the pole column body 21, so as to prevent the free end 331 of the pole lug group 33 from moving toward the battery cell body 32, thereby reducing the risk of inverted insertion.

[0201] In addition, when the free end 331 is fixed to each clamping portion 3561 (for example, by welding), the free end 331 can be first fitted between the two clamping portions 3561, and then pressure is applied to the opposite sides of the two clamping portions 3561 to achieve connection, so that the two clamping portions 3561 can separate the free end 331 of the tab group 33 from the pressure-applying device, so as to protect the free end 331 of the tab group 33, and the pressure-applying device will not contact the free end 331 of the tab group 33, so as to reduce the risk of cracking of the tab sheet 311 of the tab group 33 due to its thin thickness, which is conducive to improving the welding quality between the tab group 33 and the adapter 35, and improving the connection reliability between the tab group 33 and the adapter 35. In particular, when the thickness of the clamping portion 3561 is greater than the thickness of a single tab sheet 311, the clamping portion 3561 can effectively protect the tab sheet 311 and reduce the risk of cracking when the tab sheet 311 is connected.

[0202] In some examples, for the structure in which the free end 331 of the tab group 33 is clamped between the two clamping portions 3561: during the processing of the battery cell 102, the free end 331 of the tab group 33 can first form a first gathered portion 332, and then at least a portion of the first gathered portion 332 is disposed between the two clamping portions 3561, and the first gathered portion 332 is connected to both clamping portions 3561. In short, the plurality of tab sheets 311 of the tab group 33 are first pre-connected (e.g., pre-welded) at the free end 331 to form the first gathered portion 332, and then the first gathered portion 332 is connected to the clamping structure 356; or, the free end 331 of the tab group 33 can first be gathered to The stacking part is formed, at least part of the stacking part is arranged between the two clamping parts 3561, and the stacking part is connected to both the clamping parts 3561. It can be seen that when the stacking part is connected to the two clamping parts 3561, the connection of the multiple tabs 311 of the stacking part is realized, so that the free end 331 of the tab group 33 simultaneously forms the first gathered part 332. In short, the multiple tabs 311 of the tab group 33 are only gathered at the free end 331 to form the stacking part, and when the stacking part is connected to the clamping structure 356, the multiple tabs 311 of the stacking part are connected to form the first gathered part 332. This method can save the pre-connection process of the multiple tabs 311 at the free end 331. Among them, the multiple tabs 311 of the tab group 33 are only gathered together but not connected when the stacking part is formed at the free end 331.

[0203] Of course, in other embodiments of the present application, the end of the adapter 35 away from the pole body 21 may not be provided with the clamping structure 356. For example, the end of the adapter 35 away from the pole body 21 is formed as a flat plate structure, and the flat plate structure can be supported on the end of the free end 331 of the pole lug group 33 away from the pole body 21. Similarly, the adapter 35 can support the free end 331 of the pole lug group 33, so as to achieve the purpose of preventing the free end 331 of the pole lug group 33 from moving toward the battery cell body 32.

[0204] Please refer to Figure 7-Figure 9 In some embodiments of the present application, the adapter 35 includes a first connection portion 351, a bending portion 353 and a second connection portion 352. The first connection portion 351 and the second connection portion 352 are opposite to each other, the bending portion 353 is bent and connected between the first connection portion 351 and the second connection portion 352, the first connection portion 351 is connected to the pole body 21, and the second connection portion 352 supports the free end 331 of the pole ear group 33.

[0205] Therefore, by supporting the free end 331 of the tab group 33 through the second connecting portion 352, the redundancy of the tab group 33 can be improved, and the risk of short circuit caused by the tab group 33 being inserted upside down into the battery cell body 32 can be reduced; and the bent adapter 35 can play a role of buffer support under the premise of achieving reliable support for the free end 331 of the tab group 33, which is beneficial to reduce the risk of the battery cell component 3 colliding with the shell component 1 and improve the reliability of the battery cell 102.

[0206] In some examples, combined Figure 7 , the adapter 35 is roughly C-shaped or U-shaped, the first connection part 351 is roughly a flat plate structure, and the first connection part 351 is laid on the inner end face 211 of the pole body 21, the surface of the first connection part 351 on one side of the thickness is connected to the inner end face 211 of the pole body 21, the area of ​​the inner end face 211 of the pole body 21 is greater than or equal to the area of ​​the surface of the first connection part 351 on one side of the thickness, and the first connection part 351 can completely fall on the inner end face 211 of the pole body 21, which is conducive to increasing the connection area between the inner end face 211 of the pole body 21 and the first connection part 351, and improving the current passing efficiency. In some other examples, the adapter 35 is roughly L-shaped, the first connection part 351 is roughly a flat plate structure, and the end face of the first connection part 351 away from the second connection part 352 is connected to the inner end face 211 of the pole body 21.

[0207] It should be noted that, in the embodiment of the present application, the adapter 35 supports the free end 331 of the tab group 33, so that the free end 331 of the tab group 33 is located between the portion of the adapter 35 used to support the free end 331 and the inner end surface 211 of the pole body 21, and the free end 331 of the tab group 33 and the inner end surface 211 of the pole body 21 can be arranged in contact or spaced apart. When the free end 331 of the tab group 33 is spaced apart from the inner end surface 211 of the pole body 21, a portion of the adapter 35 (such as the first connecting portion 351 described above) can be arranged between the free end 331 of the tab group 33 and the inner end surface 211 of the pole body 21, or, no portion of the adapter 35 is arranged between the free end 331 of the tab group 33 and the inner end surface 211 of the pole body 21.

[0208] In some examples, combined Figure 7-Figure 9, the second connection portion 352 is configured as a clamping structure 356, and the second connection portion 352 includes two clamping portions 3561 arranged opposite to each other, the thickness of the second connection portion 352 is the thickness of the clamping structure 356, that is, the sum of the thicknesses t5 of the two clamping portions 3561, the free end 331 is clamped between the two clamping portions 3561, and the free end 331 is connected to each clamping portion 3561. Of course, in some other examples, the second connection portion 352 can also be configured as a flat plate structure, and the second connection portion 352 is supported on the side of the free end 331 of the tab group 33 away from the pole body 21, so that the free end 331 of the tab group 33 is located between the second connection portion 352 and the pole body 21.

[0209] Please refer to Figure 7 and Figure 8 In some embodiments of the present application, the thickness of the bending portion 353 is smaller than the thickness of at least one of the first connection portion 351 and the second connection portion 352; and / or, in the extension direction of the central axis of the bending portion 353, the width of the bending portion 353 is smaller than the width of at least one of the first connection portion 351 and the second connection portion 352.

[0210] For example, combined with Figure 8 , the thickness of the bending portion 353 is t3, the thickness of the first connecting portion 351 is t1, the thickness of the second connecting portion 352 is t2, t3<t1 and / or t3<t2; and / or, the width of the bending portion 353 is d3, the width of the first connecting portion 351 is d1, the width of the second connecting portion 352 is d2, d3<d1 and / or d3<d2.

[0211] In the above technical solution, by setting the thickness of the bending portion 353 to be smaller than the thickness of at least one of the first connection portion 351 and the second connection portion 352, and the width of the bending portion 353 to be smaller than the width of at least one of the first connection portion 351 and the second connection portion 352, the first connection portion 351 and the second connection portion 352 can be made to have a certain rigidity respectively by reducing the thickness and width of the bending portion 353, so as to realize the reliable connection between the adapter 35 and the pole body 21, and the reliable connection between the adapter 35 and the pole lug group 33. At the same time, the bending portion 353 is weakened, so that the adapter 35 is convenient to bend at the bending portion 353. In particular, for the case where the structure of the adapter 35 is roughly plate-shaped before assembly and there is a bending position in its structure after assembly, the adapter 35 can realize a soft connection between the pole body 21 and the battery cell body 32, so that the adapter 35 is convenient to bend smoothly at the bending portion 353 during the assembly process, thereby improving the assembly convenience.

[0212] Of course, the shape of the adapter 35 before and after assembly can also be the same. For example, the adapter 35 is configured such that the bending portion 353 is bent to connect the first connection portion 351 and the second connection portion 352 before and after assembly. At this time, the adapter 35 can realize a hard connection between the pole body 21 and the battery cell body 32. It can be seen that in the embodiment of the present application, whether the adapter 35 is used to realize a soft connection or a hard connection, it can support the free end 331 of the tab group 33.

[0213] In some examples, the thickness of the first connection portion 351 and the second connection portion 352 is greater than the thickness of the bending portion 353, and in this case, a first groove may be formed on at least one side of the thickness of the bending portion 353 to reduce the thickness of the bending portion 353. In some other examples, the width of the first connection portion 351 and the second connection portion 352 is greater than the width of the bending portion 353, and in this case, a second groove may be formed on at least one side of the width of the bending portion 353 to reduce the width of the bending portion 353.

[0214] Please refer to Figure 8 and Fig. 9 In some embodiments of the present application, the adapter 35 includes a plurality of adapter foils 350, which are stacked and partially connected to form a first connection portion 351 and a second connection portion 352. The first connection portion 351 and the second connection portion 352 are spaced apart, the first connection portion 351 is connected to the pole body 21, and the second connection portion 352 is connected to the free end 331.

[0215] It should be noted that, for the first connecting portion 351, any two adjacent transfer foils 350 among the multiple transfer foils 350 are directly connected or indirectly connected; for the second connecting portion 352, any two adjacent transfer foils 350 among the multiple transfer foils 350 are directly connected or indirectly connected, for example, two adjacent transfer foils 350 are indirectly connected through the free end 331 of the tab group 33.

[0216] Exemplarily, partial areas of multiple stacked transition foils 350 are directly connected to form a first connection portion 351, and another partial area of ​​the multiple stacked transition foils 350 is directly connected to a second connection portion 352, and the second connection portion 352 is connected to the free end 331 of the tab group 33. At this time, the portions of the multiple transition foils 350 corresponding to the second connection portion 352 are all located on the same side of the free end 331 of the tab group 33; or, the adapter 35 includes two transition foils 350, and partial areas of the two stacked transition foils 350 are directly connected to form a first connection portion 351, and another partial area of ​​the two stacked transition foils 350 is indirectly connected through the free end 331 of the tab group 33, so that the adapter 35 forms a second connection portion 352, and at this time, the two transition foils 350 corresponding to the second connection portion 352 are respectively located at the free ends 331 of the tab group 33. On opposite sides of 331; or, the adapter 35 includes four adapter foils 350, and a portion of the stacked areas of the four adapter foils 350 are connected to form a second connecting portion 352. At this time, two of the adapter foils 350 corresponding to the second connecting portion 352 are located on one side of the thickness of the free end 331 of the pole tab group 33, and the remaining two adapter foils 350 corresponding to the second connecting portion 352 are located on the other side of the thickness of the free end 331 of the pole tab group 33. Then, the two adapter foils 350 of the second connecting portion 352 located on the same side of the free end 331 of the pole tab group 33 are directly connected, and the adapter foil 350 of the second connecting portion 352 located on the opposite side of the free end 331 of the pole tab group 33 is indirectly connected through the free end 331 of the pole tab group 33; of course, the number of the adapter foils 350 of the adapter 35 is not limited to two or four, and can also be three, five or more than five.

[0217] In the above technical solution, by setting the adapter 35 to include a plurality of stacked adapter foils 350, the number of adapter foils 350 and the structure and size of a single adapter foil 350 can be flexibly set, so that the adapter 35 has a flexible structure and size design, thereby improving the applicability and practicality of the adapter 35, which is beneficial to reducing the difficulty of connecting with the pole body 21 and reducing the difficulty of connecting with the pole ear group 33, thereby improving the convenience of assembly.

[0218] In addition, since partial areas of the stacked multiple adapter foils 350 are connected to form the first connecting portion 351 and the second connecting portion 352 that are spaced apart, the surfaces of the two adjacent adapter foils 350 that are opposite to each other are partially connected but not completely connected, which is beneficial to reducing the processing steps of the adapter 35; moreover, since the thickness of a single adapter foil 350 is smaller than the thickness of the adapter 35, the multiple adapter foils 350 are equivalent to a multi-layer thin plate, and the adapter 35 formed by the multiple adapter foils 350 is easier to bend than an integrally formed adapter sheet. At the same time, the rigidity of some areas of the adapter 35 is relatively small, which facilitates the bending of the adapter 35 in the above-mentioned area with smaller rigidity during the assembly process of the battery cell 102, so that the setting of the above-mentioned adapter 35 facilitates the realization of a soft connection between the pole lug group 33 and the pole body 21, so that the adapter 35 is bent into a certain shape during the assembly process of the battery cell 102, thereby meeting the design requirements. For example, the plurality of transfer foils 350 may be welded at several key locations by ultrasonic welding or the like, so as to connect the plurality of transfer foils 350 together.

[0219] Please refer to Figure 7 and Figure 8 In some embodiments of the present application, the portion of the adapter 35 between the first connection portion 351 and the second connection portion 352 forms a third connection portion, and the third connection portion 354 is bent to connect the first connection portion 351 and the second connection portion 352 .

[0220] It is understandable that in the portion of the adapter 35 corresponding to the third connection portion 354 of the multiple adapter foils 350, if two adjacent adapter foils 350 are not connected, the rigidity of the third connection portion 354 is less than that of the first connection portion 351 and the second connection portion 352, so that it is easy to bend at the third connection portion 354, so that when the structural form of the adapter 35 changes during the assembly process, for example, the third connection portion 354 is not bent before assembly, and the third connection portion 354 is bent to form a bent portion 353 after assembly, it is easy to improve the convenience of assembly. In addition, the bent adapter 35 can play a role of buffer support under the premise of achieving reliable support for the free end 331 of the tab group 33, which is conducive to reducing the risk of the battery core component 3 hitting the shell component 1 and improving the reliability of the battery cell 102.

[0221] Please refer to Figure 8 In some embodiments of the present application, the plurality of transition foils 350 include at least one first transition foil 3501 and at least one second transition foil 3502 , and the first transition foil 3501 and the second transition foil 3502 are respectively connected to two sides of the thickness of the free end 331 .

[0222] In the above technical solution, by arranging the first adapter foil 3501 and the second adapter foil 3502 to be respectively connected to the thickness sides of the free end 331, the free end 331 can be separated from the pressurizing device by the first adapter foil 3501 and the second adapter foil 3502, so as to protect the free end 331, reduce the risk of the tab sheet 311 of the tab group 33 being easily cracked due to the thin thickness, etc., which is beneficial to improve the welding quality between the tab group 33 and the adapter 35, and improve the connection reliability between the tab group 33 and the adapter 35.

[0223] It can be understood that the number of the first transition foils 3501 and the number of the second transition foils 3502 may be equal or unequal, and the number of all the transition foils 350 of the transition element 35 may be an odd number or an even number.

[0224] Exemplarily, the plurality of transfer foils 350 include at least one first transfer foil 3501 and at least one second transfer foil 3502, the first transfer foil 3501 and the second transfer foil 3502 are respectively connected to both sides of the thickness of the free end 331, all the first transfer foils 3501 located on the same side of the thickness of the free end 331 can be constructed into a clamping portion 3561, and all the second transfer foils 3502 located on the same side of the thickness of the free end 331 can be constructed into a clamping portion 3561, to facilitate the forming of the clamping structure 356.

[0225] Please refer to Figure 10-Figure 14 In some embodiments, a plurality of battery cell bodies 32 arranged in sequence along the second direction constitute a battery cell group 32A, all free ends 331 of the battery cell group 32A extend toward a middle position of the battery cell group 32A in the second direction, and all free ends 331 of the battery cell group 32A are connected to form a first gathering portion 332, and the adapter 35 supports the first gathering portion 332.

[0226] Among them, the middle position of the battery cell group 32A in the second direction can correspond to the gathering area R, in the second direction, the center of the gathering area R can be the center of the battery cell group 32A, all free ends 331 of the battery cell group 32A extend to the gathering area R, and in the second direction, at least part of the first gathering portion 332 is located in the gathering area R.

[0227] It is understandable that, for the battery cell 102 , its battery cell group 32A may have one or more groups.

[0228] In the above technical solution, a group of cell groups 32A is formed by setting a plurality of cell bodies 32, which is beneficial to improving the voltage and capacity of the battery cell 102, and all free ends 331 of the cell group 32A extend toward the middle position close to the cell group 32A in the second direction, which can reduce the offset of the folded position of the tab group 33 of the cell group 32A relative to the center of the cell group 32A in the second direction. Since the larger the offset, the longer the required length of the tab group 33, the above setting can reduce the length of the tab group 33, improve the redundancy of the tab group 33, and reduce the risk of inverted insertion; moreover, the adapter 35 can support the first folded portion 332 formed by connecting all the free ends 331 of the cell group 32A, which is convenient for realizing the electrical connection between all the cell bodies 32 of the cell group 32A and the pole body 21, and is beneficial to reducing the number of adapters 35 and simplifying the structure of the battery cell 102.

[0229] Please refer to Fig.10 and Fig.11 In some embodiments, in the second direction, the midpoint of the cell group 32A in the second direction is the midpoint of the middle position, that is, the midpoint of the cell group 32A in the second direction is the midpoint of the gathered area R, and the size of the middle position is less than or equal to 1 / 2 of the size of a cell body 32, then the size of the gathered area R in the second direction is less than or equal to 1 / 2 of the size of a cell body 32 in the second direction. Therefore, under the premise of shortening the length of the tab group 33, it is convenient to take into account different assembly requirements and use requirements, which is conducive to reducing assembly requirements and improving the applicability and practicality of the battery cell 102.

[0230] For example, the size of the retracted region R in the second direction is 1 / 5, 1 / 4, 1 / 3 or 1 / 2 of the size of one battery cell body 32 in the second direction.

[0231] Please refer to Fig.11 and Fig.14 In some embodiments, there are multiple battery cell groups 32A, and the multiple battery cell groups 32A are arranged in sequence along the second direction, and the adapter 35 supports all the first folding portions 332 .

[0232] In the above technical solution, by setting up multiple groups of battery cell groups 32A, it is beneficial to further improve the voltage and capacity of the battery single body 102, and the adapter 35 supports the first folding part 332 of all battery cell groups 32A, which is convenient for realizing the electrical connection between all battery cell bodies 32 of the battery cell group 32A and the pole body 21, and is beneficial to further reduce the number of adapters 35 and simplify the structure of the battery single body 102.

[0233] Please refer to Fig.11 and Fig.14In some embodiments, the adapter 35 includes a main structure 357 and multiple branch structures 358. The main structure 357 is connected to the pole body 21. Each branch structure 358 is connected to an end of the main structure 357 away from the pole body 21, and each branch structure 358 includes at least one level of branch segment 3581, so that the adapter 35 is constructed into a fractal tree structure, and each last level of branch segment 3581 of the branch structure 358 supports a first folding portion 332.

[0234] Exemplarily, each branch structure 358 includes a first-level branch segment 3581 to a p-th-level branch segment 3581 arranged in sequence from the part of the adapter 35 connected to the pole body 21 toward the part of the adapter 35 connected to the pole lug group 33, each p-th-level branch segment 3581 supports a first folding portion 332, the main structure 357 is connected to multiple first-level branch segments 3581, each upper-level branch segment 3581 is connected to multiple lower-level branch segments 3581, for example, each first-level branch segment 3581 is connected to multiple second-level branch segments 3581, each (q-1)-th-level branch segment 3581 is connected to multiple q-th-level branch segments 3581, and p and q are positive integers respectively. For example, in combination Fig.11 Each branch structure 358 includes a first-level branch segment 3581, namely a first-level branch segment 3581, and the first-level branch segment 3581 supports the first gathering portion 332; for another example, each branch structure 358 includes two-level branch segments 3581, namely a first-level branch segment 3581 and a second-level branch segment 3581, each first-level branch segment 3581 is connected to multiple second-level branch segments 3581, and the second-level branch segment 3581 of each branch structure 358 supports the first gathering portion 332.

[0235] In the above technical solution, by setting the adapter 35 to form a fractal tree structure, the adapter 35 can realize the electrical connection between all battery cell bodies 32 and the pole body 21, and the adapter 35 can connect a larger number of battery cell bodies 32, and the space occupied by the adapter 35 is relatively small.

[0236] Exemplarily, the adapter 35 is constructed into a fractal tree structure, the number of the battery cell bodies 32 of the battery cells 102 can be two, three, four, five, six, seven or eight, etc., and the thickness of the battery cell component 3 can be extended to a maximum of 120 mm.

[0237] Please refer to Fig.11 In some embodiments, the adapter 35 includes a first connection portion 351, a bending portion 353 and a second connection portion 352. The first connection portion 351 and the second connection portion 352 are opposite to each other, the bending portion 353 is bent and connected between the first connection portion 351 and the second connection portion 352, and at least a portion of the second connection portion 352 is configured into multiple branch structures 358.

[0238] In the above technical solution, a bending portion 353 is provided to be bent and connected between the first connection portion 351 and the second connection portion 352, and at least a portion of the second connection portion 352 is constructed into a plurality of branch structures 358, so that the second connection portion 352 supports all the pole lug groups 33, thereby realizing electrical connection between all the pole lug groups 33 and the pole body 21, and the bent adapter 35 can play a role of buffer support on the premise of realizing reliable support for the free end 331 of the pole lug group 33, which is beneficial to reduce the risk of the battery cell component 3 colliding with the shell component 1 and improve the reliability of the battery cell 102.

[0239] In the above technical solution, if a part of the second connecting part 352 is constructed into multiple branch structures 358, the dividing line between the main structure 357 and the branch structure 358 (or the connection position between the main structure 357 and the branch structure 358) is located on the second connecting part 352; if the second connecting part 352 is constructed into multiple branch structures 358, the dividing line between the main structure 357 and the branch structure 358 can be located at the connection position between the second connecting part 352 and the bending part 353.

[0240] Please refer to Fig.11 In some embodiments, the connection position between the main structure 357 and the branch structure 358 is located in the middle position of all the battery cell groups 32A in the second direction. The middle position of all the battery cell groups 32A in the second direction may correspond to region R'. In the second direction, the center of region R' may be the center of all the battery cell groups 32A. In the second direction, the connection position between the main structure 357 and the branch structure 358 is located within region R'.

[0241] In the above technical solution, by setting the connection position between the main structure 357 and the branch structure 358 at the middle position of all battery cell groups 32A in the second direction, it is convenient to shorten the length of the branch structure 358 while the branch structure 358 reliably supports the tab group 33, which is beneficial to reducing the space occupied by the adapter 35.

[0242] Optionally, the size of the region R′ in the second direction is less than or equal to 1 / 2 of the size of one battery cell body 32 in the second direction; but the present invention is not limited thereto.

[0243] Please refer to Figure 10-Figure 14 In some embodiments, the number of the battery cell bodies 32 of the battery cell group 32A is an odd number or an even number; and / or the number of the battery cell bodies 32 of the multiple battery cell groups 32A is equal or unequal. Therefore, the design of the battery cell group 32A is flexible, which is convenient for improving the applicability and practicality of the battery cell 102.

[0244] For example, combined with Fig.10 and Fig.12For example, the cell group 32A is a group, and the cell group 32A includes two cell bodies 32 arranged along the second direction; for example, the cell group 32A is a group, and the cell group 32A includes three cell bodies 32 arranged along the second direction; for example, the combination Fig.13 , the battery cell group 32A is a group, and the battery cell group 32A includes four battery cell bodies 32 arranged along the second direction; for example, in combination Fig.11 and Fig.14 For example, there are two battery cell groups 32A, each battery cell group 32A includes four battery cell bodies 32 arranged along the second direction; for another example, there are two battery cell groups 32A, one of which includes three battery cell bodies 32, and the other includes five battery cell bodies 32; for another example, there are two battery cell groups 32A, one of which includes one battery cell body 32, and the other includes two battery cell bodies 32.

[0245] Please refer to Fig.15 and Fig.16 In some embodiments of the present application, the battery cell 102 also includes an insulating component 4, which is arranged in the accommodating cavity 13, and the insulating component 4 is formed with a through hole 40, and the insulating component 4 blocks the portion of the insulating component 4 that is away from the battery cell body 32 and the battery cell body 32 through the through hole 40 of the pole tab group 33 and / or the adapter 35. Then the insulating component 4 blocks the portion of the insulating component 4 that is away from the battery cell body 32 and the battery cell body 32 through the through hole 40 of the pole tab group 33, and / or the insulating component 4 blocks the portion of the adapter 35 that is away from the battery cell body 32 and the battery cell body 32 through the through hole 40.

[0246] It can be seen that at least a portion of the insulating component 4 is arranged between the end of the connecting pole lug group 33 of the battery cell body 32 and the pole post body 21, and the through hole 40 can be provided for the pole lug group 33 and / or the adapter 35 to pass through, so that the pole lug group 33 and / or the adapter 35 can be passed through the insulating component 4 to the side away from the battery cell body 32 to be electrically connected to the pole post body 21. Therefore, the insulating component 4 can be used to isolate the battery cell body 32 from the first shell wall 111 of the shell part 1, and reduce the probability of the battery cell body 32 contacting the first shell wall 111 of the shell part 1, thereby reducing the risk of the first shell wall 111 of the shell part 1 being corroded due to leakage of the battery cell body 32, reducing the risk of failure of the battery cell body 32 itself, and reducing the risk of leakage, thereby improving the reliability and stability of the battery cell 102.

[0247] Moreover, if a conductive part 4 is connected to the end of the battery cell body 32, the conductive part 4 is electrically connected to the pole body 21, and the conductive part 4 includes a pole ear group 33 and a adapter 35. Since the insulating component 4 is blocked between the pole ear group 33 and / or the adapter 35 through the perforation 40 to the part of the insulating component 4 away from the battery cell body 32 and the battery cell body 32, the insulating component 4 is blocked between the part of the conductive part that is penetrated through the perforation 40 to the side of the insulating component 4 away from the battery cell body 32 and the battery cell body 32, so that the part of the conductive part that is penetrated to the side of the insulating component 4 away from the battery cell body 32 is separated from the battery cell body 32, thereby reducing the probability of the conductive part being invertedly inserted into the battery cell body 32 due to redundancy, etc., thereby reducing the risk of short circuit in the battery cell 102 and improving the reliability of the battery cell 102.

[0248] Exemplarily, if the tab group 33 is passed through the through-hole 40, a portion of the tab group 33 is passed through the through-hole 40 to the side of the insulating component 4 facing away from the cell body 32, and the adapter 35 can be located as a whole on the side of the insulating component 4 facing away from the cell body 32 through the through-hole 40. At this time, the insulating component 4 can be blocked between the portion of the tab group 33 passed through the insulating component 4 on the side facing away from the cell body 32 and the cell body 32, and / or blocked between the adapter 35 and the cell body 32; if the adapter 35 is passed through the through-hole 40, a portion of the adapter 35 and the tab group 33 are located on the side of the insulating component 4 facing the cell body 32, and another portion of the adapter 35 is located on the side of the insulating component 4 facing away from the cell body 32. At this time, the insulating component 4 can be blocked between the above-mentioned other portion of the adapter 35 and the cell body 32.

[0249] Please refer to Fig.15 and Fig.16 In some embodiments of the present application, the insulating component 4 includes an insulating film 41, and the insulating film 41 completely covers the battery cell body 32. The insulating film 41 covers all surfaces of the battery cell body 32, so that the insulating film 41 can isolate the outer surface of the battery cell body 32 from the shell component 1, reduce the risk of the shell component 1 being corroded due to leakage of the battery cell body 32, reduce the risk of failure of the battery cell body 32 itself, and reduce the risk of leakage, thereby improving the reliability and stability of the battery cell 102.

[0250] Among them, a through hole 40 is formed at a position of the insulating film 41 opposite to the first shell wall 111, and the part of the insulating film 41 surrounding the through hole 40 is blocked between the part of the pole tab group 33 that penetrates through the through hole 40 to the side of the insulating film 41 facing the pole body 21 and the battery cell body 32, and the part of the insulating film 41 surrounding the through hole 40 is blocked between the part of the pole tab group 33 that penetrates through the through hole 40 to the side of the insulating film 41 that is away from the battery cell body 32 and the battery cell body 32.

[0251] In the above technical solution, since the portion of the insulating film 41 surrounding the through hole 40 is blocked between the portion of the tab group 33 that passes through the through hole 40 to the insulating film 41 facing the pole body 21 and the battery body 32, it is convenient to make the size of the through hole 40 on the insulating film 41 adaptable to the size of the tab group 33. For example, the size of the first avoidance hole is adapted to the thickness of the portion of the tab group 33 located at the first avoidance hole. On the one hand, the through hole 40 allows the tab group 33 to be smoothly penetrated to be electrically connected to the pole body 21, and on the other hand, the tab group 33 is penetrated at When the hole 40 is in the state, the insulating film 41 can still cover the multiple pole tab sheets 311 of the pole tab group 33 near the root of the battery cell body 32, further realizing insulation protection for the battery cell body 32 and reducing the risk of bare leakage of the battery cell body 32. At the same time, the portion of the pole tab group 33 passing through the hole 40 can be separated from the battery cell body 32, reducing the redundancy of the pole tab group 33 and / or the adapter 35, etc., which may cause them to be inserted upside down into the battery cell body 32, as well as the probability of the pole tab group 33 near the root of the battery cell body 32, which is beneficial to further reduce the risk of short circuit of the battery cell 102.

[0252] In some examples, the perforations 40 on the insulating film 41 are normally open holes adapted to the size of the tab group 33, that is, when the insulating film 41 is in a natural state (a state where the insulating film 41 is not squeezed by the tab group 33), the size of the perforations 40 is greater than zero. As a result, the tab group 33 can quickly pass through the insulating film 41, which is conducive to improving the efficiency of the insulating film 41 wrapping the battery body 32, thereby improving the assembly efficiency of the battery cell 102, and the tab group 33 can avoid the insulating film 41 during the process of passing through the insulating film 41, thereby reducing the probability of deformation of the tab group 33, reducing the operation steps for shaping the tab group 33, and further improving the assembly efficiency of the battery cell 102.

[0253] In some other examples, a tearing structure 411 is provided at a position of the insulating film 41 opposite to the first shell wall 111, and the tearing structure 411 is suitable for being torn under the action of the tab group 33 to form a perforation 40. For example, in the process of covering the outer side of the battery cell body 32 with the insulating film 41, when the tab group 33 pushes the tearing structure 411 on the insulating film 41, a perforation 40 that can be opened and closed can be formed on the insulating film 41, so that the tab group 33 can be smoothly penetrated through the perforation 40, and because the perforation 40 has a self-closing characteristic, after the tab group 33 is penetrated in place, the perforation 40 can gradually tend to close, so that the insulating film 41 can cover at least a portion of the root of the multiple tab sheets 311 of the tab group 33 adjacent to the battery cell body 32.

[0254] Therefore, by setting the tearing structure 411, insulation protection can be formed for the roots of the multiple pole tabs 311 of the pole tab group 33 adjacent to the battery cell body 32, so that the part of the pole tab group 33 passing through the perforation 40 is separated from the roots of the multiple pole tabs 311 of the pole tab group 33 adjacent to the battery cell body 32, thereby reducing the probability of the pole tab group 33 being invertedly inserted into the interior of the battery cell body 32 due to redundancy and the probability of the multiple pole tabs 311 of the pole tab group 33 being invertedly inserted into the roots of the battery cell body 32, thereby reducing the risk of short circuit in the battery cell 102.

[0255] Please refer to Figure 17-Figure 20 In some embodiments of the present application, the insulating component 4 includes an insulating bracket 42, which is arranged on the side of the battery cell body 32 facing the first shell wall 111, so that the battery cell body 32 is supported by the insulating bracket 42, and the battery cell body 32 is separated from the first shell wall 111, thereby reducing the probability of contact between the battery cell body 32 and the first shell wall 111, which is beneficial to reducing the risk of the first shell wall 111 being corroded due to leakage of the battery cell body 32, reducing the risk of leakage, and improving the reliability and stability of the battery cell 102.

[0256] Among them, a through hole 40 is formed at the position of the insulating bracket 42 opposite to the pole component 2, and the part of the insulating bracket 42 surrounding the through hole 40 is blocked between the adapter 35 and the battery cell body 32. At this time, the adapter 35 can be located on the side of the insulating bracket 42 away from the battery cell body 32, and the pole ear group 33 is passed through the through hole 40 on the insulating bracket 42.

[0257] In the above technical solution, since the part of the insulating bracket 42 surrounding the through hole 40 is blocked between the adapter 35 and the battery cell body 32, the insulating bracket 42 can play a certain supporting role on the adapter 35, and the adapter 35 supports the free end 331 of the pole tab group 33. The insulating bracket 42 can insulate and separate the free end 331 of the pole tab group 33 from the battery cell body 32, reducing the probability of the free end 331 of the pole tab group 33 being inserted into the battery cell body 32, and the probability of the pole tab group 33 being inserted into the root of the battery cell body 32 adjacent to the battery cell body 32, thereby reducing the risk of short circuit and improving the reliability of the battery cell 102.

[0258] Furthermore, the insulating bracket 42 abuts against one end of the adapter 35 facing the battery cell body 32, and the insulating bracket 42 can play a certain indirect supporting role on the free end 331 of the pole tab group 33 through the adapter 35, thereby improving the supporting reliability of the free end 331 of the pole tab group 33, and further reducing the probability of the pole tab group 33 being inserted upside down into the battery cell body 32, and the probability of the pole tab group 33 being inserted upside down into the root of the battery cell body 32 adjacent to the battery cell body 32, thereby reducing the risk of short circuit and improving the reliability of the battery cell 102.

[0259] Please refer to Fig.17 and Fig.18In some embodiments of the present application, the insulating component 4 includes an insulating bracket 42, and the through hole 40 on the insulating bracket 42 has a first hole wall and a second hole wall arranged opposite to each other in the width direction of the pole body 21. The insulating bracket 42 includes a bracket body 421 and a first separator 422. The bracket body 421 is arranged at one end of the battery cell body 32 facing the first shell wall 111, and the first separator 422 is arranged at the first hole wall, and the first separator 422 is connected to the bracket body 421. The first separator 422 extends in a direction close to the center of the through hole 40, and the first separator 422 is blocked between the adapter 35 and the battery cell body 32; at this time, the insulating bracket 42 does not include the second separator 423 described below.

[0260] It can be understood that the first separator 422 can be parallel to the width direction of the pole body 21 , or can be inclined relative to the width direction of the pole body 21 .

[0261] Please refer to Fig.19 and Fig. 20 In some embodiments of the present application, the insulating component 4 includes an insulating bracket 42, and the through hole 40 on the insulating bracket 42 has a first hole wall and a second hole wall arranged opposite to each other in the width direction of the pole body 21. The insulating bracket 42 includes a bracket body 421, a first separator 422, and a second separator 423. The bracket body 421 is arranged at one end of the battery body 32 facing the first shell wall 111, the first separator 422 is arranged at the first hole wall, and the first separator 422 is connected to the bracket body 421, and the first separator 422 extends in a direction close to the center of the through hole 40. The first separator 422 is blocked between the adapter 35 and the battery body 32, and the second separator 423 is arranged at the second hole wall, and the second separator 423 is connected to the bracket body 421, and the second separator 423 extends in a direction close to the center of the through hole 40. It can be seen that the first separator 422 and the second separator 423 are arranged at intervals to form a through hole 40 between the two.

[0262] It is understandable that the second separator 423 may be parallel to the width direction of the pole body 21 , or may be inclined relative to the width direction of the pole body 21 .

[0263] In some embodiments of the present application, the insulating component 4 includes an insulating film 41 and an insulating bracket 42, the insulating film 41 completely covers the battery cell body 32, a through hole 40 is formed at a position of the insulating film 41 opposite to the first shell wall 111, and a portion of the insulating film 41 surrounding the through hole 40 is blocked between the portion of the tab group 33 that passes through the through hole 40 to the side of the insulating film 41 facing the pole body 21 and the battery cell body 32, the insulating bracket 42 is arranged on the side of the battery cell body 32 facing the first shell wall 111, and a through hole 40 is formed at a position of the insulating bracket 42 opposite to the pole component 2, and a portion of the insulating bracket 42 surrounding the through hole 40 is blocked between the adapter 35 and the battery cell body 32. Among them, the through hole 40 on the insulating bracket 42 and the through hole 40 on the insulating film 41 can be arranged opposite to each other, and the insulating bracket 42 can cover at least a portion of the insulating film 41 on one end of the battery cell body 32 facing the first shell wall 111.

[0264] An insulating material piece is disposed between the pole body 21 and the first shell wall 111 to achieve insulation between the first shell wall 111 and the pole body 21. For example, the insulating material piece may be a part of the pole component 2 (e.g., the insulating structure 23), or, for another example, the insulating material piece may be disposed between the pole component 2 and the shell component 1.

[0265] Please refer to Figure 21-24 In some embodiments of the present application, the pole component 2 also includes a transition structure 22 and an insulating structure 23. The transition structure 22 surrounds the pole body 21, and the transition structure 22 is connected to the first shell wall 111. The insulating structure 23 is insulated and fitted between the transition structure 22 and the pole body 21.

[0266] The adapter structure 22 surrounds the entire circumference of the pole body 21 along the circumference of the mounting hole 112, so that the adapter structure 22 can play a role in connecting the pole body 21 and the first shell wall 111 in the outer peripheral area of ​​the pole body 21, and the insulating structure 23 insulates the matching position of the adapter structure 22 and the pole body 21 to prevent the pole body 21 and the adapter structure 22 from being electrically short-circuited. The connection method between the adapter structure 22 and the first shell wall 111 is not limited, for example, welding, riveting, punching, bonding, etc. can be used.

[0267] In the above technical solution, the pole component 2 has a simple structure and is easy to process. Moreover, since it includes two parts, namely the pole body 21 and the adapter structure 22, the shape and size of the pole body 21 and the shape and size of the adapter structure 22 can be designed separately based on different factors, so as to flexibly adapt to the connection requirements with different forms of shell components 1 and battery core components 3, thereby increasing the scope of application of the pole component 2.

[0268] Exemplarily, the adapter structure 22 can be set to match the shape of the mounting hole 112, and the shape of the mounting hole 112 can be designed to be a long strip that is convenient for the pole component 2 to pass through and makes the flipping angle of the pole component 2 smaller. At the same time, the pole body 21 can be designed to be a long strip that matches the shape of the adapter structure 22, so that the pole body 21 has a larger area to connect with the adapter 35, or the pole body 21 can be designed to be a circle that does not match the shape of the adapter structure 22, so as to help reduce the connection area between the pole body 21 and the adapter structure 22, improve the force uniformity at the connection between the pole body 21 and the adapter structure 22, and thus improve the connection reliability between the pole body 21 and the adapter structure 22.

[0269] For example, the adapter structure 22 is formed into a long strip (such as a rectangle or a racetrack) extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22 (such as a rectangle or a racetrack). As mentioned above, the battery cell component 3 is connected to the pole component 2 through the conductive portion 4. When the contour shape of the pole body 21 is formed into a long strip that matches the contour shape of the adapter structure 22, the area of ​​the pole body 21 is larger, which is conducive to increasing the connection area between the adapter 35 and the pole body 21, thereby improving the conductive performance.

[0270] Exemplarily, when the pole component 2 includes the above-mentioned pole body 21, the adapter structure 22 and the insulating structure 23, during the assembly process of the battery cell 102, "connecting the battery cell component 3 with the pole component 2" can specifically include: connecting the battery cell component 3 with the pole body 21; setting the pole component 2 connected to the battery cell component 3 at the mounting hole 112, and connecting the adapter structure 22 with the first shell wall 111.

[0271] Please refer to Figure 21-24 In some embodiments of the present application, the insulating structure 23 is also sealed and matched between the adapter structure 22 and the pole body 21. Therefore, the insulating structure 23 can not only insulate the adapter structure 22 from the pole body 21, but also make the matching position of the adapter structure 22 and the pole body 21 present a sealed state, so as to isolate the inside and outside of the shell component 1 after the adapter structure 22 is connected to the first shell wall 111, reduce the risk of the electrolyte in the shell component 1 leaking from the matching position of the adapter structure 22 and the pole body 21 to the outside of the shell component 1, and reduce the risk of liquid or dust outside the shell component 1 entering the shell component 1 from the matching position of the adapter structure 22 and the pole body 21, thereby improving the reliability of the battery cell 102.

[0272] In the above technical solution, since the insulating structure 23 is also sealed and matched between the transition structure 22 and the pole body 21, when the pole component 2 is installed on the first shell wall 111 and the transition structure 22 and the first shell wall 111 are connected, there is no need to set a seal between the transition structure 22 and the first shell wall 111, and there is no need to apply a large sealing pressure to meet the compression degree of the seal there, so that the force on the first shell wall 111 can be reduced, and the role of protecting the shell component 1 can be played, which is conducive to reducing the wall thickness of the shell component 1 and reducing material costs. In addition, since the first shell wall 111 is the end of the shell body 11 opposite to the opening 113, the force at the connection between the first shell wall 111 and the second shell wall 114 can be reduced, and the force on the second shell wall 114 can be reduced, which is conducive to ensuring the reliability of the shell body 11 and reducing the wall thickness and cost of the shell body 11.

[0273] Please refer again Figure 21-24 In some embodiments of the present application, the insulating structure 23 includes a sealing structure 231. In the embodiments of the present application, the sealing structure 231 is made of a material having both sealing and insulating properties, such as an elastic rubber member.

[0274] Please refer again Figure 21-24 Exemplarily, at least a portion of the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 in the inner and outer directions (eg, the fifth direction) of the first shell wall 111 .

[0275] In the embodiment of the present application, the direction from the inner side of the first shell wall 111 to the outer side of the first shell wall 111, and the direction from the outer side of the first shell wall 111 to the inner side of the first shell wall 111 are collectively referred to as "the inner and outer directions of the first shell wall 111 (e.g., the fifth direction)". The "inner side of the first shell wall 111" refers to the side of the first shell wall 111 facing the battery core component 3, and the "outer side of the first shell wall 111" refers to the side of the first shell wall 111 facing away from the battery core component 3.

[0276] The sealing structure 231 at least includes an axial side portion 231a, the side of the axial side portion 231a facing the accommodating cavity 13 is the inner side of the axial side portion 231a, and the side of the axial side portion 231a away from the battery cell component 3 is the outer side of the axial side portion 231a, and one of the transition structure 22 and the pole body 21 is partially clamped on the outer side of the axial side portion 231a, and the other part is clamped on the inner side of the axial side portion 231a, so that the axial side portion 231a is clamped between the transition structure 22 and the pole body 21 in the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) to achieve axial sealing between the transition structure 22 and the pole body 21.

[0277] Thus, by setting at least part of the sealing structure 231 to be clamped between the transition structure 22 and the pole body 21 in the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111, an axial seal between the transition structure 22 and the pole body 21 is achieved, and the axial seal can achieve a more reliable sealing effect, thereby improving the leakage problem at the matching position of the transition structure 22 and the pole body 21. Moreover, the embodiment of the present application can reduce the axial force on the first shell wall 111 by integrating the axial seal (e.g., the shaft side portion 231a) into the pole component.

[0278] Please refer again Figure 21-24 Exemplarily, the sealing structure 231 is arranged around the peripheral side of the adapter structure 22 facing the pole body 21 (i.e., the inner ring of the adapter structure 22). In the embodiment of the present application, since the adapter structure 22 is arranged around the pole body 21 and connected to the first shell wall 111, the peripheral side of the adapter structure 22 facing the pole body 21 is the "inner ring 2211 of the adapter structure 22", and the peripheral side of the adapter structure 22 facing the first shell wall 111 is the "outer ring 2212 of the adapter structure 22". In the above technical solution, by arranging the sealing structure 231 around the inner ring of the adapter structure 22, the sealing structure 231 can be close to the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily realizing compression sealing thereof, and the seal is not easy to fail, thereby improving the sealing effect.

[0279] In addition, when the insulating structure 23 includes a sealing structure 231, the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 so that the transition structure 22 and the pole body 21 are sealed and matched, and the transition structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is arranged at the length center position of the transition structure 22 and is circular, since the connection position of the transition structure 22 and the pole body 21 is subjected to uniform force, it is easy to control the compression amount of the sealing structure 231 to improve the reliability of the sealing cooperation between the transition structure 22 and the pole body 21, and the sealing area is relatively small and not easy to fail.

[0280] Please refer again Figure 21-24 In some embodiments of the present application, the pole body 21 includes a peripheral portion 212, and the transition structure 22 is clamped on both sides of the peripheral portion 212 in the inner and outer directions of the first shell wall 111 through the insulating structure 23, and at least a portion of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the battery core component 3 and the transition structure 22.

[0281] In this embodiment, the peripheral portion 212 can be the outer peripheral structure of the pole body 21. Since the sealing structure 231 is arranged around the peripheral side of the transition structure 22 facing the pole body 21, the sealing structure 231 can be clamped between the peripheral portion 212 and the transition structure 22.

[0282] In this embodiment, the side of the peripheral portion 212 facing away from the battery cell component 3 is the outer side of the peripheral portion 212, and the side of the peripheral portion 212 facing the accommodating cavity 13 is the inner side of the peripheral portion 212. The transition structure 22 is limited to the outer side of the peripheral portion 212 by the insulating structure 23 to limit the movement of the pole body 21 relative to the transition structure 22 in the direction away from the battery cell component 3. The transition structure 22 is also limited to the inner side of the peripheral portion 212 by the insulating structure 23 to limit the movement of the pole body 21 relative to the transition structure 22 toward the accommodating cavity 13, thereby achieving the transition structure 22 being clamped on both sides of the peripheral portion 212 in the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the insulating structure 23.

[0283] In the above technical solution, the structure of the pole component 2 is simple and easy to process, and the relative fixation and insulation matching between the pole body 21 and the adapter structure 22 can be simply and effectively achieved. The peripheral portion 212 of the pole body 21 and the adapter structure 22 are used to clamp the sealing structure 231, so that the sealing structure 231 can be in the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily achieving compression sealing on it, and the seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the battery core component 3 and the adapter structure 22, the sealing structure 231 can be sealed from the side of the peripheral portion 212 facing the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking out of the matching position between the pole body 21 and the adapter structure 22, thereby improving the sealing effect.

[0284] Please refer again Fig.24 , illustratively, the insulating structure 23 further includes a first insulating member 232, and the transition structure 22 is clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 through the first insulating member 232 and the sealing structure 231. In this embodiment, the transition structure 22 is not limited in composition, and can be a single part or a combination of multiple parts (e.g., two or more).

[0285] Since at least a portion of the sealing structure 231 (such as the axial side portion 231a) is arranged on the side of the peripheral portion 212 facing the battery cell component 3, at least a portion of the first insulating member 232 is arranged on the side of the peripheral portion 212 away from the battery cell component 3. The transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the first insulating member 232 and the sealing structure 231 respectively.

[0286] In the above technical solution, since the insulating structure 23 includes the first insulating member 232 and the sealing structure member 231 which are not integrated into one piece, the design and processing of the insulating structure 23 can be simplified. Moreover, according to the specific matching requirements with the pole body 21 and the adapter structure 22, the first insulating member 232 can be set as an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the first insulating member 232 can be set as a compressible sealing member that has a sealing effect (such as an elastic rubber member), so as to meet different actual requirements. In addition, when the first insulating member 232 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure member 231 and improve the sealing effect.

[0287] Alternatively, in some other embodiments of the present application, the sealing structure 231 can also be an integral structure and outwardly wrap the peripheral portion 212, so as to be respectively located on the side of the peripheral portion 212 facing the battery core component 3 and the side away from the battery core component 3, and 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 sealing structure 231. That is, the sealing structure 231 is an integral annular structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a respectively located on the inner and outer sides of the peripheral portion 212, so that the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions (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 outwardly wraps the peripheral portion 212, it is possible to reduce the number of components and assembly processes.

[0288] Please refer again Figure 21-24 In some embodiments of the present application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is arranged on a side of the first adapter ring 221 that is away from the battery core component 3. The second adapter ring 222 is connected to the first adapter ring 221, and the first adapter ring 221 is connected to the first shell wall 111. The sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232.

[0289] For example, the first adapter ring 221 and the second adapter ring 222 can be welded, riveted, punched, or bonded. For example, the outer ring of one of the first adapter ring 221 and the second adapter ring 222 is welded, riveted, punched, or bonded to the first shell wall 111. Exemplarily, the first adapter ring 221 and the second adapter ring 222 are both made of aluminum and welded, and the first adapter ring 221 and the first shell wall 111 are both made of aluminum and welded, which is conducive to improving the welding yield.

[0290] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 which are arranged inside and outside and assembled and connected, so as to facilitate the assembly connection between the adapter structure 22 and the insulating structure 23 and the pole body 21, so that the pole component 2 is easy to process and manufacture, and it is easy to control the compression amount of the sealing structure 231, thereby improving the sealing reliability.

[0291] The second adapter ring 222 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232 in any manner. Figure 21-24 The first insulating member 232 and the second adapter ring 222 can be connected by injection molding. Fig.25 , Fig.25 A cross-sectional view of a pole component provided for some embodiments of the present application; the second adapter ring 222 may include a stop ring portion 2221, and at least a portion of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5), wherein the material of the first insulating member 232 is not limited, for example, it may be a plastic member or an elastic rubber member.

[0292] Please refer again Fig.24 , exemplarily, the adapter structure 22 further includes a first insulating frame 224, and the first insulating frame 224 is connected to the side of the first adapter ring 221 facing the battery core component 3. Therefore, the first insulating frame 224 can be used to insulate between the battery core component 3 and the first adapter ring 221, reducing the difficulty of setting the insulation structure here. Exemplarily, the first insulating frame 224 has a pin, and the first adapter ring 221 has a socket, and the pin is inserted into the socket by interference fit to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0293] Please refer to Fig.26 , Fig.26 A cross-sectional view of a pole component provided in some embodiments of the present application; in some embodiments of the present application, the adapter structure 22 includes a third adapter ring 223, and the third adapter ring 223 includes an integrally arranged inner extension portion 2231 and an outer extension portion 2232. That is, the inner extension portion 2231 and the outer extension portion 2232 are different parts of an integral piece, rather than two separate parts assembled and connected.

[0294] The end of the inner extension 2231 facing the pole body 21 (i.e., the inner ring of the inner extension 2231) and the end of the outer extension 2232 facing the pole body 21 (i.e., the inner ring of the outer extension 2232) are spaced in the inner-outer direction, so as to be clamped on both sides of the peripheral portion 212 along the inner-outer direction (e.g., the fifth direction F5) of the first shell wall 111 by the insulating structure 23. The sealing structure 231 is clamped between the inner extension 2231 and the peripheral portion 212, and the outer extension 2232 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232.

[0295] The third adapter ring 223 and the first shell wall 111 may be connected in any manner, such as welding, riveting, punching, bonding, etc. For example, the third adapter ring 223 and the first shell wall 111 are both made of aluminum and welded, which is beneficial to improving welding yield.

[0296] The outer extension portion 2232 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232 in any manner. Fig.26 The outer extension portion 2232 rivets the first insulating member 232 against the peripheral portion 212. For another example, please refer to Fig. 27 , Fig. 27 A cross-sectional view of a pole component provided in some embodiments of the present application; the first insulating member 232 and the pole body 21 , as well as the first insulating member 232 and the outer extension portion 2232 are respectively connected by injection molding, and the inner extension portion 2231 rivets the sealing structure 231 against the peripheral portion 212 .

[0297] For example, please refer again to Fig. 27 , 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 battery core component 3. Therefore, the second insulating frame 225 can be used to insulate between the battery core component 3 and the third adapter ring 223, eliminating the need to provide an insulating structure. Exemplarily, the second insulating frame 225 has a plug, and the third adapter ring 223 has a socket, and the plug is inserted into the socket by interference fit to achieve the connection between the second insulating frame 225 and the third adapter ring 223.

[0298] Please refer to Figure 28-Figure 29 In some embodiments of the present application, the transition structure 22 includes a mating ring portion 2271, the pole body 21 includes a penetration portion 214 penetrated through the mating ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetration portion 214 and clamped on the inner and outer sides of the mating ring portion 2271, and at least a portion of the sealing structure 231 is clamped between the mating ring portion 2271 and the inner limiting portion 215.

[0299] Exemplarily, the adapter structure 22 includes a fourth adapter ring 227, the fourth adapter ring 227 includes a matching ring portion 2271, and the fourth adapter ring 227 is connected to the first shell wall 111, for example, the outer ring of the fourth adapter ring 227 is connected to the first shell wall 111. The connection method between the fourth adapter ring 227 and the first shell wall 111 is not limited, for example, welding, riveting, punching, bonding, etc. Exemplarily, the fourth adapter ring 227 and the first shell wall 111 are both made of aluminum and are welded, which is conducive to improving the welding yield.

[0300] In the above technical solution, the structure of the pole component 2 is simple and easy to process, and the relative fixation and insulation matching between the pole body 21 and the adapter structure 22 can be simply and effectively achieved. The sealing structure 231 is clamped by the matching position of the pole body 21 and the matching ring part 2271, so that the sealing structure 231 can be in the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily achieving compression sealing on it, and the seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the matching ring part 2271 and the inner limit part 215, the sealing structure 231 can be sealed from the side of the matching ring part 2271 facing the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking out of the matching position between the pole body 21 and the adapter structure 22, thereby improving the sealing effect.

[0301] Please refer again Fig.28 The insulating structure 23 may further include a second insulating member 234 , wherein at least a portion of the sealing structure member 231 is clamped between the inner limiting portion 215 and the mating ring portion 2271 , and at least a portion of the second insulating member 234 is clamped between the outer limiting portion 216 and the mating ring portion 2271 .

[0302] In the above technical solution, since the insulating structure 23 includes the second insulating member 234 and the sealing structure 231 which are not integrated into one piece, the design and processing of the insulating structure 23 can be simplified. Moreover, according to the specific matching requirements with the pole body 21 and the adapter structure 22, the second insulating member 234 can be set as an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the second insulating member 234 can be set as a compressible sealing member (such as an elastic rubber member) with a sealing effect, so as to meet different actual requirements. In addition, when the second insulating member 234 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure 231 and improve the sealing effect.

[0303] Alternatively, please combine Fig.29In some other embodiments of the present application, the sealing structure 231 can also be an integral structure and surround the matching ring 2271, so as to be respectively located on the side of the matching ring 2271 facing the battery core component 3 and the side away from the battery core component 3, and the pole body 21 is clamped on both sides of the matching ring 2271 along the inner and outer directions (for example, the fifth direction F5) of the first shell wall 111 through the sealing structure 231. That is, the sealing structure 231 is an integral annular structure, which has both insulation and sealing properties. The sealing structure 231 includes shaft side portions 231a respectively located on the inner and outer sides of the matching ring 2271, so that the adapter structure 22 can be clamped on both sides of the matching ring 2271 along the inner and outer directions (for example, the fifth direction F5) of the first shell wall 111 through the two shaft 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 matching ring 2271, the number of parts and the assembly process can be reduced.

[0304] In an embodiment of the present application, when the pole body 21 includes a penetration portion 214, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetration portion 214 and clamped on both sides of the mating ring portion 2271, the structure of the pole body 21 is not limited, and it can be a single part or a combination of multiple parts (such as two or more).

[0305] For example, please refer again to Fig.28 , the outer limiting portion 216 and the penetration portion 214 are assembled and connected on the side of the matching ring portion 2271 away from the inner limiting portion 215. Among them, the method of assembling and connecting the outer limiting portion 216 and the penetration portion 214 is not limited, such as welding, punching, adhesive connection, etc., and the assembly connection refers to the connection of two parts together through a connection process. Therefore, the outer limiting portion 216 and the penetration portion 214 are set as separate parts and assembled and connected, and the structure of the pole body 21 is simple and easy to assemble and connect with the adapter structure 22. In addition, when the outer limiting portion 216 and the penetration portion 214 are welded, the thermal impact on the sealing structure 231 clamped between the inner limiting portion 215 and the matching ring portion 227 can be reduced, and the sealing reliability of the sealing structure 231 can be improved.

[0306] In the above embodiment, the connection method between the penetration portion 214 and the inner limiting portion 215 is not limited, and can be an integral part, or can be a split part and pre-connected together. Exemplarily, the end of the penetration portion 214 that is away from the inner limiting portion 215 can include a riveted portion 2141. During assembly, the penetration portion 214 can be penetrated along the direction from the inner limiting portion 215 to the outer limiting portion 216 through the matching ring portion 2271 with the insulating structure 23, and then the riveted portion 2141 is riveted to limit the penetration portion 214 from coming out along the direction from the outer limiting portion 216 to the inner limiting portion 215. After that, the riveted portion 2141 can be connected to the outer limiting portion 216, so as to facilitate the connection between the penetration portion 214 and the outer limiting portion 216, such as welding. Alternatively, the riveted portion 2141 can be omitted, and the riveting process after the penetration of the penetration portion 214 is omitted.

[0307] For example, please combine again Fig.29 In some other embodiments of the present application, the outer limiting portion 216 and the penetration portion 214 are an integral part, and the outer limiting portion 216 rivets the second insulating member 234 against the matching ring portion 2271. In the above technical solution, the assembly connection of the outer limiting portion 216 with the insulating structure 23 and the transition structure 22 is achieved by riveting, which reduces the thermal impact of the heat generated when the outer limiting portion 216 is connected with the insulating structure 23 and the transition structure 22 on the sealing structure 231, thereby improving the sealing reliability of the sealing structure 231. In addition, by riveting the outer limiting portion 216 to press the second insulating member 234 against the matching ring portion 2271, it is easy to control the compression amount of the sealing structure 231 and achieve a better compression effect.

[0308] In the above embodiment, the connection method of the penetration portion 214 and the inner limiting portion 215 is not limited, and can be an integral piece, or can be a separate piece and pre-connected together. Exemplarily, during assembly, the penetration portion 214 can be penetrated by the matching ring portion 2271 matched 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 is riveted to limit the relative movement of the pole component 21 and the adapter structure 22.

[0309] The pole body 21 is a solid structure or a hollow structure. For example, when the pole body 21 is a hollow structure, please refer to Fig.29The pole body 21 includes a first pole piece 21a and a second pole piece 21b. The second pole piece 21b is composed of a penetration portion 214, an inner limit portion 215 and an outer limit portion 216, and is mounted on the first shell wall 111. The penetration portion 214 surrounds a matching hole 21b1 that penetrates along the inner and outer directions of the first shell wall 111. The first pole piece 21a is assembled on the side of the second pole piece 21b that is away from the battery cell component 3 and covers the matching hole 21b1, so as to form a receiving space open toward the battery cell component 3 between the first pole piece 21a and the second pole piece 21b. A part of the conductive part 4 can extend into the receiving space and be connected to the first pole piece 21a, so that the pole body 21 can play the role of accommodating the conductive part 4, so as to reduce the space occupied by the conductive part 4 in the receiving cavity 13, which is conducive to improving the energy density of the battery cell 102.

[0310] Please refer again Fig.28 In some embodiments of the present application, the adapter structure 22 further includes a third insulating frame 228, and the third insulating frame 228 is connected to the side of the fourth adapter ring 227 facing the battery core component 3. Therefore, the third insulating frame 228 can be used to insulate between the battery core component 3 and the fourth adapter ring 227, eliminating the need to set an insulating structure here. Exemplarily, the third insulating frame 228 has a pin, and the fourth adapter ring 227 has a socket, and the pin is inserted into the socket by interference fit to achieve the connection between the third insulating frame 228 and the fourth adapter ring 227.

[0311] Please refer to Fig.30 In some embodiments of the present application, the first shell wall 111 has a mounting hole 112, and a sealing ring 14 is arranged around the mounting hole 112. The sealing ring 14 is clamped between the pole component 2 and the first shell wall 111. Therefore, the pole component 2 has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall 111.

[0312] In some embodiments of the present application, a mounting hole 112 is provided on the first shell wall 111, the pole component 2 covers the mounting hole 112, and the edge of the adapter structure 22 overlaps one side of the first shell wall 111 in the wall thickness direction. In this way, by covering the adapter structure 22 on one side of the first shell wall 111 in the wall thickness direction, that is, the adapter structure 22 is covered on the outer side of the first shell wall 111, or is covered on the inner side of the first shell wall 111, the assembly of the adapter structure 22 and the first shell wall 111 is facilitated.

[0313] Exemplarily, the adapter structure 22 is connected to the first shell wall 111 by welding. For example, after the adapter structure 22 is covered on the first shell wall 111, the adapter structure 22 and the first shell wall 111 can be connected by welding, so as to facilitate processing and better ensure the connection reliability between the adapter structure 22 and the first shell wall 111. For example, welding can be performed from the outside of the first shell wall 111 so that the weld formed by the connection between the two is exposed on the side of the first shell wall 111 away from the battery core component 3 (i.e., the side away from the battery core body 32), so as to facilitate welding operation and increase welding space. The present application is not limited to this. For example, in some other embodiments of the present application, the adapter structure 22 can also be set to be penetrated in the mounting hole 112 and riveted to the first shell wall 111.

[0314] Please refer to Fig.31 and Fig.32 , Fig.31 The middle pole component 2 is in a state of being covered before the first shell wall 111; Fig.32 for Fig.31 The pole component 2 shown in FIG. 1 is a state diagram after being covered with the first shell wall 111.

[0315] Please refer to Fig.31 and Fig.32 In some embodiments, when the battery cell component 3 is first connected to the pole component 2 and then the pole component 2 is assembled and connected to the first shell wall 111, after the battery cell component 3 is connected to the pole component 2 (for example, the pole component 2 and the battery cell component 3 can be connected first, then installed into the shell body 11 together, and then the pole component 2 is extended from the mounting hole 112 to the outside of the first shell wall 111; or for another example, the battery cell component 3 is installed into the shell body 11, the conductive part 4 is passed through the mounting hole 112, and connected to the pole component 2 pre-arranged on the outside of the first shell wall 111), the pole component 2 is covered on the mounting hole 112 of the first shell wall 111 from the outside of the first shell wall 111 (that is, the side away from the battery cell body 32). At this time, the edge of the adapter structure 22 overlaps the side of the first shell wall 111 away from the battery cell component 3. Therefore, since the pole component 2 covers the first shell wall 111 from the outside, it is convenient to assemble and connect the pole component 2 with the first shell wall 111, which is beneficial to improve the connection reliability between the pole component 2 and the first shell wall 111.

[0316] Please refer to Fig.31 and Fig.32In some embodiments of the present application, when the edge of the adapter structure 22 overlaps the side of the first shell wall 111 away from the battery core component 3, the first shell wall 111 may be provided with a first sinking groove 1111 arranged around the mounting hole 112, the first sinking groove 1111 is open in the direction away from the battery core component 3 (that is, the first sinking groove 1111 is open in the direction away from the battery core body 32), and the edge of the adapter structure 22 is embedded in the first sinking groove 1111, wherein the edge of the adapter structure 22 has a flange portion 22a surrounding the adapter structure 22, and the flange portion 22a is embedded in the first sinking groove 1111. Thus, it is convenient to support and position the connection between the adapter structure 22 and the first shell wall 111, which is conducive to the welding connection between the two from the outside of the first shell wall 111 (that is, the side away from the battery core body 32).

[0317] Please refer again Fig.31 and Fig.32 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 is substantially consistent with the groove depth of the first groove 1111. Thus, it is convenient to weld the flange portion 22a to the first shell wall 111, the thickness of the flange portion 22a is not too large relative to the groove depth of the first groove 1111, and unnecessary space occupation can be reduced, and the thickness of the flange portion 22a is not too small relative to the groove depth of the first groove 1111, and the welding strength requirement can be met.

[0318] Combination Figure 31-Figure 33 In some embodiments of the present application, the mounting hole 112 is an elongated hole (e.g., a rectangle, an ellipse, or a racetrack), and the pole component 2 is formed into an elongated structure (e.g., a rectangle, an ellipse, or a racetrack) that matches the shape of the mounting hole 112. When the battery cell component 3 is first connected to the pole component 2, and then the pole component 2 and the battery cell component 3 are installed into the shell body 11, and then the pole component 2 is extended from the mounting hole 112 to the outside of the first shell wall 111, and then the pole component 2 is turned over from the outside of the first shell wall 111 to cover the pole component 2 at the mounting hole 112, and then the pole component 2 is connected to the first shell wall 111, if the pole component 2 is set to a long strip structure that matches the shape of the mounting hole 112, the pole component 2 can be adjusted to the thickness direction thereof and the width direction of the mounting hole 112. The pole component 2 is passed through the mounting hole 112 at an angle close to the second direction F2. After the pole component 2 passes through the mounting hole 112, the thickness direction of the pole component 2 is rotated to be close to the thickness direction of the first shell wall 111 (for example, the first direction). In this way, the space required for the flipping movement of the pole component 2 is smaller, which can reduce the space required for the flipping of the pole component 2, thereby shortening the length of the conductive part 4, saving materials, and reducing costs. It can also reduce the redundancy of the conductive part 4 and reduce the space occupied by the conductive part 4 in the accommodating cavity 13, which is beneficial to improving the energy density of the battery cell 102.

[0319] Please refer to Fig.33 and Fig.34 In some embodiments, when the connection between the cell component 3 and the pole component 2 is first performed, and then the pole component 2 is assembled and connected to the first shell wall 111, the cell component 3 and the pole component 2 can be installed into the shell body 11 together after the connection between the cell component 3 and the pole component 2, so that the pole component 2 can be covered at the mounting hole 112 of the first shell wall 111 from the inner side of the first shell wall 111 (i.e., the side facing the cell body 32), and at this time, the edge of the transition structure 22 overlaps the side of the first shell wall 111 facing the cell component 3. Therefore, since the pole component 2 is set at the mounting hole 112 from the inner side of the first shell wall 111, the cell component 3 and the pole component 2 can be installed into the shell body 11 together, and the pole component 2 does not need to pass through the mounting hole 112, thereby reducing the operation steps and reducing the difficulty of operation.

[0320] Please refer to Fig.33 and Fig.34 In some embodiments of the present application, when the edge of the transfer structure 22 overlaps the side of the first shell wall 111 facing the battery core component 3, the edge of the transfer structure 22 has a second sunken groove 22b open in the direction away from the battery core component 3 (that is, the second sunken groove 22b is open in the direction away from the battery core body 32), and the first shell wall 111 includes a lap portion 1112 protruding into the mounting hole 112, and the lap portion 1112 is embedded in the second sunken groove 22b. As a result, it is convenient to support and position the connection between the pole component 2 and the first shell wall 111, which is conducive to the welding connection between the two from the outside of the first shell wall 111 (that is, the side away from the battery core body 32).

[0321] Please refer again Fig.33 and Fig.34 , exemplarily, the thickness of the overlap portion 1112 matches the groove depth T2 of the second groove 22b, wherein "matching" means that the thickness of the overlap portion 1112 is substantially consistent with the groove depth of the second groove 22b. Thus, it is convenient to weld the overlap portion 1112 to the first shell wall 111, the thickness of the overlap portion 1112 is not too large relative to the groove depth of the second groove 22b, which can reduce unnecessary space occupation, and the thickness of the overlap portion 1112 is not too small relative to the groove depth of the second groove 22b, which can meet the welding strength requirements.

[0322] In some embodiments of this application, please refer to Figure 7The pole component 2 forms a receiving groove 5 which is recessed relative to the first shell wall 111 in a direction away from the battery core component 3 and is open in a direction toward the battery core component 3, and at least a portion of the adapter 35 is accommodated in the pole body of the receiving groove 5. That is, the pole component 2 forms a receiving groove 5, the groove wall of the receiving groove 5 is formed by the pole component 2, the receiving groove 5 is recessed in a direction away from the battery core body 32, and the receiving groove 5 is open in a direction toward the battery core body 32, so that the receiving groove 5 is connected with the receiving cavity 13.

[0323] Therefore, by providing the receiving groove 5 to receive the adapter 35, the space occupied by the adapter 35 in the receiving chamber 13 can be reduced, so that the receiving chamber 13 has a larger space to receive the battery cell body 32, which is beneficial to increase the volume of the battery cell body 32, thereby increasing the energy density of the battery cell 102. Moreover, since the receiving groove 5 is open toward the direction of the battery cell component 3, the adapter 35 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0324] For example, please refer again to Figure 7 The accommodating groove 5 is formed on the side of the pole body 21 and the adapter structure 22 facing the battery cell component 3 (i.e., the side facing the battery cell body 32), and the adapter structure 22 is raised relative to the first shell wall 111 in the direction away from the battery cell component 3 (i.e., the direction away from the battery cell body 32), so that the accommodating groove 5 is recessed relative to the first shell wall 111 in the direction away from the battery cell component 3.

[0325] Therefore, by processing the adapter structure 22 into an outwardly protruding bulge, a part of the accommodating groove 5 is formed on the side of the pole body 21 facing the battery cell component 3, and another part of the accommodating groove 5 is formed on the side of the adapter structure 22 facing the battery cell component 3, and the accommodating groove 5 is in a shape that is recessed relative to the first shell wall 111 in the direction away from the battery cell component 3, so that the side of the pole body 21 facing the battery cell component 3 and the side of the adapter structure 22 facing the battery cell component 3 both have a space accommodating groove conductive part 4, so that it is not only convenient to accommodate the conductive part 4 to a greater extent, but also conducive to the design of a variety of forms of the conductive part 4.

[0326] In other embodiments of the present application, Fig. 27 When the adapter structure 22 does not bulge in the direction away from the battery cell component 3 (i.e., away from the battery cell body 32) relative to the first shell wall 111, the height difference between the adapter structure 22 and the pole body 21 can also define a receiving groove 5 that is recessed in the direction away from the battery cell component 3 relative to the first shell wall 111.

[0327] In some embodiments of this application, please refer to Figure 7, the surface of one end of the pole body 21 facing the battery cell component 3 is the inner end face 211 of the pole body 21, the inner end face 211 of the pole body 21 participates in forming the accommodating groove 5, and the conductive part 4 is connected to the inner end face 211 of the pole body 21. That is, at least part of the inner end face 211 of the pole body 21 participates in defining the groove wall of the accommodating groove 5, and the conductive part 4 is connected to the part of the inner end face 211 of the pole body 21 that serves as the groove wall of the accommodating groove 5. In the above technical solution, at least part of the accommodating groove 5 is surrounded by the surface of one side of the pole body 21 facing the battery cell component 3, and the conductive part 4 received in the accommodating groove 5 can be easily contacted and connected to the pole body 21, thereby improving the connection convenience and simplifying the structure.

[0328] Exemplarily, when at least part of the conductive portion 4 is accommodated in the accommodating groove 5, the pole connecting portion (e.g., the folded portion 313 of the pole tab group 33 described herein, or the second connecting segment 412 or the first conductive segment 415 of the conductive member 41) of the conductive portion 4 (e.g., the pole tab group 33 or the conductive member 41) can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21. During processing, the pole connecting portion of the conductive portion 4 can be first loaded into the accommodating groove 5, and then the pole connecting portion can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21.

[0329] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 (such as an ultrasonic weld) of the pole lug group 33 described herein, or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0330] For example, refer to Figure 7 Regardless of whether the adapter structure 22 bulges relative to the first shell wall 111 in a direction away from the battery core component 3, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, and the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21. The inner end surface 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a bulging shape, and the circle of the inner end surface 220 of the adapter structure 22 that is most facing the pole body 21 is the surrounding area 2201.

[0331] Exemplarily, when the inner end face 211 of the pole body 21 is set to be larger (for example, the transition structure 22 is formed as a long strip extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the transition structure 22), and when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, the pole connecting part of the conductive part 4 (for example, the retracted part 313 of the pole ear group 33 described in this article, or the second connecting section 412 of the conductive part 41) can be completely laid flat on the inner end face 211 of the pole body 21.

[0332] For example, in combination Fig.25 When the inner end surface 211 of the pole body 21 is small (for example, the adapter structure 22 is set to be a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is arranged in the center of the adapter structure 22 and has a circular outline), and when the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, a part of the pole connection part of the conductive part 4 (for example, the retracted part 313 of the pole ear group 33 described in this article, or the second connection section 412 of the conductive member 41) can be laid flat on the inner end surface 211 of the pole body 21, and the remaining part can be laid flat on the surrounding area 2201, so that the pole connection part of the conductive part 4 (for example, the case where the pole connection part is also a long strip) can be supported as a whole, which is convenient for the pressing of the welding nozzle, so that the conductive part 4 can be reliably connected to the pole body 21.

[0333] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 (such as an ultrasonic weld) of the pole lug group 33 described herein, or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0334] For example, refer to Fig.26 Regardless of whether the adapter structure 22 bulges relative to the first shell wall 111 in a direction away from the battery cell component 3, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is the surrounding area 2201 surrounding the pole body 21, and the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction of the battery cell component 3. The inner end surface 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a bulging shape, and the circle of the inner end surface 220 of the adapter structure 22 that is most facing the pole body 21 is the surrounding area 2201.

[0335] Therefore, by setting the inner end surface 211 of the pole body 21 to protrude from the surrounding area 2201 toward the direction of the battery core component 3, when the height of the pole body 21 is constant, it is equivalent to retracting the pole body 21 in the direction of the accommodating cavity 13, so as to reduce the space occupied by the pole component 2 outside the shell component 1, and reduce the battery cell 102 in the direction of setting the pole component 2 (for example Figure 3 The dimension in the first direction F1) shown in FIG.

[0336] Exemplarily, when the inner end face 211 of the pole body 21 is set to be larger (for example, the transition structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the transition structure 22), and when the inner end face 211 of the pole body 21 protrudes out of the surrounding area 2201 in the direction of the battery core component 3, the pole connecting part of the conductive part 4 (for example, the retracted part 313 of the pole ear group 33 described in this article, or the second connecting section 412 of the conductive part 41) can be completely laid flat on the inner end face 211 of the pole body 21.

[0337] For example, in combination Fig.26When the inner end surface 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is arranged as a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is arranged in the center of the adapter structure 22 and has a circular outline), and when the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 toward the direction of the battery core component 3, the conductive part 4 can be arranged to include a pole lug group 33 and a conductive member 41 connected to the pole lug group 33, the conductive member 41 includes a first conductive segment 415 laid on the inner end surface 211 of the pole body 21, and a second conductive segment 416 staggered from the inner end surface 211 of the pole body 21, the second conductive segment 416 protrudes relative to the first conductive segment 415 toward a direction away from the battery core component 3 (that is, toward the outside, or toward a direction away from the battery core body 32), and the pole lug group 33 is connected to the second conductive segment 416. Thus, the height difference between the inner end surface 211 of the pole body 21 and the surrounding area 2201 can be used to accommodate the second conductive segment 416 of the conductive member 41 and the tab group 33, so that the space can be fully utilized, the space occupation of the conductive part 4 in the accommodating cavity 13 can be reduced, and the energy density of the battery cell 102 can be improved. Exemplarily, if the portion where the tab group 33 is connected to the second conductive segment 416 (such as the retracted portion 313 described herein) is in the shape of a long strip, the second conductive segment 416 can also be set to a long strip, and the first conductive segment 415 can be set to a circular shape that matches the shape of the pole body 21, which can meet the connection requirements. In addition, when the conductive member 41 includes the first conductive segment 415 and the 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 battery core component 3, the conductive member 41 can be processed with a material having a certain hardness and thickness, for example, the conductive member 41 can be a metal sheet.

[0338] For example, refer to Fig. 27 Regardless of whether the adapter structure 22 bulges relative to the first shell wall 111 in a direction away from the battery cell component 3, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, and the surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 in the direction of the battery cell component 3. The inner end surface 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a bulge, and the inner end surface 220 of the adapter structure 22 that is most facing the pole body 21 is the surrounding area 2201.

[0339] For example, refer to Fig.29When the inner end face 211 of the pole body 21 is set to be larger (for example, the adapter structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22), and when the surrounding area 2201 protrudes from the inner end face 211 of the pole body 21 toward the direction of the battery core component 3, the pole connecting part of the conductive part 4 (for example, the retracted part 313 of the pole ear group 33 described in this article, or the second connecting section 412 of the conductive member 41) can be completely laid flat on the inner end face 211 of the pole body 21.

[0340] For example, in combination Fig. 27 When the inner end face 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is configured to be a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is disposed at the center of the adapter structure 22 and has a circular outline), and when the surrounding area 2201 protrudes from the inner end face 211 of the pole body 21 toward the direction of the battery core component 3, the conductive member 41 can be configured to include a first conductive segment 415 laid on the inner end face 211 of the pole body 21, and a third conductive segment 417 staggered from the inner end face 211 of the pole body 21, the third conductive segment 417 protrudes relative to the first conductive segment 415 toward the direction of the battery core component 3, and the tab group 33 is connected to the third conductive segment 417. Thus, the adapter 41 can meet the connection requirements with the inner end face 211 of the pole body 21 and easily meet the connection requirements with the tab group 33. In addition, when the conductive member 41 includes the first conductive segment 415 and the third conductive segment 417, in order to ensure that the third conductive segment 417 protrudes relative to the first conductive segment 415 toward the direction of the battery core component 3, the conductive member 41 can be processed with a material having a certain hardness and thickness, for example, the conductive member 41 can be a metal sheet. Exemplarily, if the portion where the tab group 33 is connected to the third conductive segment 417 (such as the gathered portion 313 described herein) is in the shape of a long strip, the third conductive segment 417 can also be set to a long strip, and the first conductive segment 415 can be set to a shape that matches the matching area 211a (such as a circle), which can meet the connection requirements.

[0341] Please refer to Figure 4 and Figure 5 In some embodiments, the housing component 1 includes a housing body 11 and a housing cover 12. The housing body 11 is an integral piece, and one end of the housing body 11 is open. The housing cover 12 is disposed at the open end of the housing body 11. Exemplarily, the open end of the housing body 11 has an opening 113, and the housing cover 12 is disposed on the opening 113. The housing body 11 and the housing cover 12 together form a receiving cavity 13. Figure 4 , the first shell wall 111 is located at the end of the shell body 11 away from the shell cover 12, that is, the shell wall at the end of the shell body 11 opposite to the opening 113 is the first shell wall 111; or, in combination Figure 5, the first shell wall 111 is formed on the shell cover 12 , and the shell cover 12 serves as the first shell wall 111 .

[0342] Of course, in other examples, the shell component 1 can also include two shell bodies 11, one end of each shell body 11 is open to form an opening 113, the openings 113 of the two shell bodies 11 are opposite to and cover each other, and the two shell bodies 11 together form a accommodating cavity 13, and the shell wall at one end of one of the shell bodies 11 opposite to the opening 113 is the first shell wall 111.

[0343] In some embodiments, in combination Figure 4 The shell component 1 includes a shell body 11 that participates in forming an accommodating cavity 13. One end of the shell body 11 is open to form an opening 113. The shell wall at one end of the shell body 11 opposite to the opening 113 is a first shell wall 111. It can be understood that the shell body 11 is an integrally formed part, and includes a first shell wall 111 and a second shell wall 114. The second shell wall 114 surrounds the edge of the first shell wall 111, and the second shell wall 114 extends from the edge of the first shell wall 111 toward one side in the thickness direction of the first shell wall 111. The end of the second shell wall 114 away from the first shell wall 111 defines the opening 113, and a cavity is defined between the first shell wall 111 and the second shell wall 114, and the cavity constitutes at least part of the accommodating cavity 13.

[0344] When the shell component 1 includes a shell body 11 with an opening 113 at one end, the shell component 1 also includes a shell body matching structure, which matches the shell body 11 to cover the opening 113 and together with the shell body 11, encloses a accommodating chamber 13. For example, the shell body 11 is in a semi-closed cylindrical shape, and the shell body matching structure is in a flat plate shape, that is, the shell body matching structure can be a shell cover 12. At this time, the shell component 1 can be a combination of the shell body 11 and the shell cover 12. For another example, the shell body 11 is in a semi-closed cylindrical shape, and the shell body matching structure can be a semi-closed cylindrical shape, that is, the shell body matching structure can be the other half of the shell body 11. At this time, the shell component 1 can be a combination of two shell bodies 11, etc. For another example, the shell body matching structure can be a shell group, which is composed of multiple parts. As a result, the shell component has various forms and can adapt to a variety of application scenarios.

[0345] For example, in combination Figure 4 The shell component 1 may include a shell body 11 and a shell cover 12, one end of the shell body 11 has an opening 113, the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 together form a accommodating cavity 13, and the end of the shell body 11 opposite to the opening 113 serves as a first shell wall 111; or, exemplarily, the shell component 1 may include two shell bodies 11, one end of each shell body 11 has an opening 113, the openings 113 of the two shell bodies 11 are opposite to and cover each other, the two shell bodies 11 together form a accommodating cavity 13, and the end of one shell body 11 opposite to the opening 113 serves as the first shell wall 111.

[0346] In the above technical solution, when the shell wall at one end of the shell body 11 opposite to the opening is the first shell wall 111, since the electric core component 3 accommodated in the shell component 1 is connected to the pole component 2 installed on the first shell wall 111, when the battery 100 vibrates or deforms, the pole components 2 connected by the busbar component will be pulled against each other. Since the pole component 2 is arranged on the end wall of the shell body 11 opposite to the opening 113, the force acting on the pole component 2 will be preferentially transmitted to the shell body 11, and will not directly act on the shell body matching structure (such as the shell cover 12), thereby not only extending the distance for the force to be transmitted to the connection between the shell body 11 and the shell body matching structure (such as the shell cover 12), but also the shell body 11 will preferentially deform when subjected to force, so as to reduce the force at the connection between the shell body 11 and the shell body matching structure (such as the shell cover 12), thereby effectively reducing the probability of cracking at the connection between the shell body 11 and the shell body matching structure (such as the shell cover 12) during the use of the battery 100, and improving the reliability of the battery cell 102. Furthermore, since the connection position between the shell body 11 and the shell body matching structure (such as the shell cover 12) is not prone to cracking, there is no need to increase the wall thickness of the two in order to increase the reliability of the connection between the two, which is beneficial to reducing weight and material costs, and is beneficial to miniaturizing the battery cell 102, or improving the energy density of the battery cell 102. The connection method between the shell body 11 and the shell body matching structure is not limited, for example, it can be bonding, welding, etc.

[0347] Exemplarily, when the end wall of the shell body 11 opposite to the opening 113 is used as the first shell wall 111 for installing the pole component 2, if the pole component 2 is first installed at the installation hole 112 of the first shell wall 111, and then the battery cell component 3 is installed in the shell body 11, it is difficult to connect the battery cell component 3 with the pole component 2. In some embodiments of the present application, the battery cell component 3 and the pole component 2 can be connected first, and then the pole component 2 can be assembled and connected to the shell component 1, so that the connection requirements of the battery cell component 3 and the pole component 2 can be met, and the connection requirements of the pole component 2 and the shell component 1 can also be met, thereby improving the reliability and processability of the battery cell 102.

[0348] Moreover, this processing sequence can effectively shorten the length of the conductive part 4. For example, as long as the battery cell component 3 and the pole component 2 are connected first, and the pole component 2 and the shell component 1 are connected later, the material and cost of the conductive part 4 can be saved, the redundancy of the conductive part 4 can be reduced, the risk of short circuit can be reduced, and the space occupied by the conductive part 4 in the shell component 1 can be reduced, which is beneficial to improving the energy density of the battery cell 102.

[0349] Please refer to Figure 3In some embodiments of the present application, the battery cell 102 further includes a pressure relief component 6, which is disposed on the shell component 1. Exemplarily, the pressure relief component 6 may be an explosion-proof valve mounted on the shell component 1, or may be integrally formed in a thinned area of ​​the shell component 1. Thus, by providing the pressure relief component 6, when the pressure in the shell component 1 exceeds a preset value, the pressure may be directionally relieved through the pressure relief component 6, thereby improving the reliability of the battery cell 102. The pressure relief component 6 may be disposed on the first shell wall 111, or on other shell walls other than the first shell wall 111, and the first shell wall 111 may be one or more.

[0350] For example, in combination Figure 3 , the pressure relief component 6 and the pole component 2 are located on the same side. Since the pole component 2 is provided on the first shell wall 111, when the pressure relief component 6 is also provided on the first shell wall 111, the pressure relief component 6 and the pole component 2 are located on the same side. Thus, the design of other shell walls other than the first shell wall 111 can be simplified, and the structure and processing of the battery cell 102 can be simplified.

[0351] Exemplarily, the pressure relief component 6 is located on the opposite side from the pole component 2. Since the pole component 2 is provided on the first shell wall 111, when the pressure relief component 6 is provided on other walls of the housing component 1 except the first shell wall 111, for example, the pressure relief device 6 is provided on the second shell wall 114, or the pressure relief device 6 is provided on the shell cover 12, the pressure relief device 6 is located on the opposite side from the pole component 2. Therefore, there is no need to consider that the pressure relief component 6 occupies the space of the first shell wall 111 and reduces the volume of the pole component 2, so that the shape and volume of the pole component 2 can be flexibly designed as needed.

[0352] For example, the shell component 1 can be surrounded by multiple non-coplanar shell walls, for example, a rectangular shell wall component is surrounded by six shell walls, one of which is the first shell wall 111, and the pressure relief component 6 is arranged on any other shell wall other than the first shell wall 111, and the pole component 2 is arranged on the first shell wall 111, then the two are located on different sides.

[0353] In a second aspect, the present application provides a processing method, which is used to process the above-mentioned battery cell 102. Fig.35 , processing methods include:

[0354] Step S20, the battery core component 3 is loaded into the accommodating cavity 13, and one end of the battery core component 3 where the tab group 33 is arranged is arranged inside the first shell wall 111 and opposite to the first shell wall 111;

[0355] Step S30, installing the pole component 2 on the first shell wall 111, and connecting the pole tab group 33 to the pole body 21 through the adapter 35, and making the adapter 35 support the free end 331 of the pole tab group 33, so that the adapter 35 can prevent the free end 331 from moving toward the battery body 32.

[0356] “The inner side of the first shell wall 111 ” refers to the side of the first shell wall 111 facing the battery cell body 32 in the thickness direction. Similarly, “the outer side of the first shell wall 111 ” refers to the side of the first shell wall 111 away from the battery cell body 32 in the thickness direction.

[0357] The present application does not limit the order of "installing the pole component 2 on the first shell wall 111" and "connecting the pole lug group 33 to the pole body 21 through the adapter 35". The pole component 2 can be installed on the first shell wall 111 first, and then the pole lug group 33 can be connected to the pole body 21 through the adapter 35, or the pole lug group 33 can be connected to the pole body 21 through the adapter 35 first, and then the pole component 2 can be installed on the first shell wall 111. Regardless of the above order, the adapter 35 can support the free end 331 of the pole lug group 33.

[0358] Thus, the pole lug group 33 and the pole column body 21 are indirectly connected through the adapter 35 to form electrical conduction, which can shorten the length of the pole lug group 33 and improve the redundancy of the pole lug group 33, which is beneficial to improving the problems of wrinkling, bending and breaking of the pole lug sheet 311 of the pole lug group 33. At the same time, since the pole lug group 33 is relatively short and the adapter 35 has certain restrictions on the pole lug group 33 due to its connection with the pole lug group 33, it is beneficial to reduce the risk of short circuit caused by the pole lug group 33 being inserted in reverse into the battery cell body 32. The shape and material of the adapter 35 can be flexibly designed to reduce the difficulty of connecting the adapter 35 with the pole column body 21 and the difficulty of connecting the adapter 35 with the pole lug group 33, which is beneficial to improving the assembly convenience of the battery cell 102.

[0359] Moreover, the adapter 35 supports the free end 331 of the tab group 33. For example, a portion of the adapter 35 can be supported on the side of the free end 331 of the tab group 33 facing the battery body 32, or a portion of the adapter 35 can be supported on the side of the free end 331 of the tab group 33 away from the pole body 21, so that the free end 331 of the tab group 33 is located between the portion of the adapter 35 supporting the free end 331 of the tab group 33 and the inner end surface 211 of the pole body 21. The supporting arrangement can prevent the free end 331 of the pole tab group 33 from moving toward the battery cell body 32. For example, when the pole tab group 33 is subjected to an external force so that the pole tab group 33 has a tendency to move toward the battery cell body 32, the adapter 35 can apply a reaction force to the free end 331 of the pole tab group 33 to hinder the movement tendency of the pole tab group 33 toward the battery cell body 32, thereby reducing the risk of the pole tab group 33 moving toward the battery cell body 32 and causing a short circuit due to the inverted insertion into the battery cell body 32, which is beneficial to improving the reliability of the battery cell 102.

[0360] It can be understood that in the step of “installing the pole component 2 on the first shell wall 111, and connecting the pole lug group 33 to the pole body 21 through the adapter 35, and making the adapter 35 support the free end 331 of the pole lug group 33”, the pole lug group 33 is first connected to the pole body 21 through the adapter 35, and then the pole component 2 is installed on the first shell wall 111, then the battery cell component 3 is first connected to the pole component 2, and then the pole component 3 connected to the battery cell component 3 is installed to the first shell wall 111. Since the pole component 2 has various forms, it can be a form in which the incoming material is inseparable as a whole, or it can be a form in which the incoming material is assembled in multiple parts. At this time, “installing the pole component 2 connected to the battery cell component 3 to the first shell wall 111” is understood in a broad sense, that is, the part connecting the pole component 2 to the battery cell component 3 can be assembled to the first shell wall 111.

[0361] Exemplarily, when the pole component 2 does not need to be assembled, "connect the battery cell component 3 with the pole component 2; install the pole component 2 connected to the battery cell component 3 to the first shell wall 111" can be specifically: "first connect the pole component 2 with the battery cell component 3, and then install the pole component 2 to the first shell wall 111 (for example, cover the pole component 2 at the installation hole 112 on the first shell wall 111, and then connect the pole component 2 to the first shell wall 111 such as welding, riveting, or bonding)".

[0362] Exemplarily, when the pole component 2 needs to be assembled, "connect the battery cell component 3 with the pole component 2; install the pole component 2 connected to the battery cell component 3 to the first shell wall 111" can also be: "first complete the connection of a part of the pole component 2 (for example, the first pole component) with the battery cell component 3, and the remaining part of the pole component 2 (for example, the second pole component) with the first shell wall 111, and then combine and connect the above two parts of the pole component 2".

[0363] Since the connection between the cell component 3 and the pole component 2 is completed first, and then the pole component 2 and the shell component 1 are assembled and connected, rather than pre-installing the pole component and the shell component first and then connecting the cell component and the pole component, it is beneficial to shorten the length of the conductive part 4 connecting the pole component 2 and the cell component 3, reduce the redundancy of the conductive part 4 in the shell component 1, and reduce the space occupied by the conductive part 4 in the shell component 1, which is beneficial to improve the energy density of the battery cell 102, and is beneficial to reduce the risk of the conductive part 4 being inserted into the cell body 32 of the cell component 3 and causing a short circuit, thereby improving the reliability of the battery cell 102. In addition, this assembly method can realize the assembly of the battery cell 102 regardless of whether the pole component 2 is set on the shell body 11 or the pole component 2 is set on the shell cover 12, so the installation position of the pole component 2 can be flexibly selected on the shell component 1. Among them, when the pole component 2 is set on the shell body 11, it is beneficial to reduce the cracking problem at the connection between the shell body 11 and the shell cover 12, and improve the reliability of the battery cell 102.

[0364] In the embodiment of the present application, the execution order of each step of the processing method is not based on the step number if there is no conflict, that is, the step number does not constitute a restriction on the execution order of each step.

[0365] Please refer to Figure 36-37E In some embodiments, the first shell wall 111 is formed with a mounting hole 112, and step S20, "mounting the pole component 2 on the first shell wall 111, and connecting the pole lug group 33 to the pole body 21 through the adapter 35, and making the adapter 35 support the free end 331 of the pole lug group 33" includes: step S31, connecting one end of the adapter 35 to the pole lug group 33, and the other end passes through the mounting hole 112 to the outside of the first shell wall 111 and is connected to the pole body 21; step S32, covering the pole component 2 connected with the adapter 35 on the mounting hole 112 from the inner side or the outer side of the first shell wall 111.

[0366] It can be seen that the above scheme can be understood as the adapter 35 first passes through the mounting hole 112, the adapter 35 is welded to the pole component 2 outside the mounting hole 112, and the pole component 2 then covers the mounting hole 112 from the outside or inside of the first shell wall 111. It can be understood that in the above scheme, when the pole component 2 covers the mounting hole 11 from the inside of the first shell wall 111, the pole component 2 can pass through the mounting hole 112 again so that the pole component 2 is located on the inside of the first shell wall 111, so as to connect the pole component 2 to the first shell wall 111.

[0367] For example, in step S31, "connect one end of the adapter 35 to the pole lug group 33, and the other end passes through the mounting hole 112 to the outside of the first shell wall 111 to connect with the pole body 21", first connect one end of the adapter 35 to the pole lug group 33, then pass the other end of the adapter 35 through the mounting hole 112 to the outside of the first shell wall 111, and then connect the adapter 35 that has passed to the outside of the first shell wall 111 to the pole body 21 of the pole component 2 placed on the outside of the first shell wall 111. Therefore, since the adapter 35 is not connected to the pole component 2 when passing through the mounting hole 112, it is convenient for the adapter 35 to pass through the mounting hole 112, thereby improving the convenience of operation. Moreover, since the welding position between the pole component 2 and the adapter 35 is located on the outside of the first shell wall 111, the problem of conductive chips formed during welding entering the interior of the shell body 11 and damaging the battery core component 3 can be improved.

[0368] Exemplarily, the mounting hole 112 is an elongated hole (e.g., rectangular, oval, track-shaped, etc.), and the portion of the adapter 35 that needs to pass through the mounting hole 112 is an elongated shape that matches the shape of the mounting hole 112. At this time, the thickness direction of this portion of the adapter 35 can be adjusted to match the width direction of the mounting hole 112, and the length direction of this portion of the conductive portion 4 is at an angle to the length direction of the mounting hole 112. In this way, this portion of the adapter 35 can pass through the mounting hole 112 smoothly, thereby improving assembly efficiency and reducing the risk of collision and scratching between the adapter 35 and the housing component 1. However, the present application is not limited to this, and the mounting hole 112 and the portion of the adapter 35 that needs to pass through the mounting hole 112 can also be processed into other shapes, such as a circle, a polygon, etc.

[0369] In the above scheme, the adapter 35 first passes through the mounting hole 112, connects the adapter 35 to the pole component 2 outside the mounting hole 112, and then covers the pole component 2 connected with the adapter 35 with the mounting hole 112. This scheme is suitable for the scenario where the shell cover 12 serves as the first shell wall 111, the scenario where the shell body 11 includes the first shell wall 111, and the scenario where the free end 331 described later is connected to the adapter 35 in the form of the laminated portion 312 or the first retracted portion 332.

[0370] Please refer to Figure 38-39DIn some embodiments, the first shell wall 111 is formed with a mounting hole 112, and step S30, "mounting the pole component 2 on the first shell wall 111, and connecting the pole lug group 33 to the pole body 21 through the adapter 35, and allowing the adapter 35 to support the free end 331 of the pole lug group 33" includes: step S33, placing the battery core component 3 on the inner side of the first shell wall 111, connecting one end of the adapter 35 to the pole lug group 33, and connecting the other end to the pole body 21; step S34, passing the pole component 2 connected with the adapter 35 through the mounting hole 112 and covering the mounting hole 112 from the inner side or outer side of the first shell wall 111.

[0371] It can be seen that the above scheme can be understood as the adapter 35 is first connected to the pole component 2, that is, the battery cell component 3 is first connected to the pole component 2, and then the pole component 2 is passed through the mounting hole 112, and the mounting hole 11 is covered from the outside or inside of the first shell wall 111, and the assembly of the battery cell component 3 and the pole component 2, and the pole component 2 and the first shell wall 111 can also be realized. It can be understood that in the above scheme, when the pole component 2 connected with the adapter 35 is covered with the mounting hole 11 from the inside of the first shell wall 111, the pole component 2 connected with the adapter 35 does not need to pass through the mounting hole 112, and the mounting hole 112 is covered from the inside of the first shell wall 111; or, the pole component 2 connected with the adapter 35 passes through the mounting hole 112 again so that the pole component 2 is located on the inside of the first shell wall 111, so as to connect the pole component 2 connected with the adapter 35 to the first shell wall 111.

[0372] In the above scheme, the adapter 35 is first connected to the pole component 2, and then the pole component 2 is installed on the first shell wall 111. It is suitable for the scenario where the shell cover 12 serves as the first shell wall 111, and is also suitable for the scenario where the shell body 11 includes the first shell wall 111. It is also suitable for the scenario where the free end 331 described later is connected to the adapter 35 in the form of a laminated portion 312 or a first retracted portion 332.

[0373] Exemplarily, the pole component 2 includes a pole body 21 and a transition structure 22, and “installing the pole component 2 on the first shell wall 111” can be understood as installing the pole component 2 connected to the battery cell component 3 on the first shell wall 111, which can specifically include: setting the pole component 2 connected to the battery cell component 3 at the mounting hole 112, and connecting the transition structure 22 to the first shell wall 111.

[0374] Among them, “setting the pole component 2 connected to the battery cell component 3 at the mounting hole 112, and connecting the adapter structure 22 to the first shell wall 111” may specifically include: passing the pole component 2 connected to the battery cell component 3 from the inner side of the first shell wall 111 through the mounting hole 112 to the outer side of the first shell wall 111; covering the pole component 2 that has passed through the outer side of the first shell wall 111 with the mounting hole 112 from the outer side of the first shell wall 111, so that the adapter structure 22 stops at the outer side of the first shell wall 111; connecting the adapter structure 22 and the first shell wall 111 from the outer side of the first shell wall 111. The adapter structure 22 stops at the outer side of the first shell wall 111, which means that the adapter structure 22 is partially supported on the side of the first shell wall 111 away from the battery cell body 32.

[0375] Therefore, since the battery cell component 3 and the pole component 2 are connected first and then the pole component 2 is passed through the mounting hole 112, there is no need to consider avoiding the first shell wall 111 when connecting the battery cell component 3 and the pole component 2. In other words, when connecting the battery cell component 3 and the pole component 2, the pole component 2 and the battery cell component 3 are not located on both sides of the first shell wall 111, which is conducive to further shortening the length of the conductive part 4, reducing the redundancy of the conductive part 4 after assembly, reducing the risk of reverse insertion, and improving the reliability of the battery cell 102. In addition, since the welding position of the pole component 2 and the battery cell component 3 is located outside the shell body 11, the problem of conductive chips formed during welding entering the inside of the shell body 11 and damaging the battery cell component 3 can be improved. Furthermore, since the pole component 2 is covered on the mounting hole 112 from the outside of the first shell wall 111, the adapter structure 22 is stopped at the outside of the first shell wall 111, and the adapter structure 22 is connected to the first shell wall 111 from the outside of the first shell wall 111, so as to facilitate the assembly and connection of the pole component 2 and the first shell wall 111, which is beneficial to improve the connection reliability of the pole component 2 and the first shell wall 111.

[0376] Please refer to Fig.40 and Fig.41 In some embodiments, the tab group 33 includes a plurality of tab sheets 311; before connecting the tab group 33 to the adapter 35 in step S31, step S10a is also included, in which the plurality of tab sheets 311 are gathered together to form a stacked portion 312 at the free end 331, wherein the stacked portion 312 refers to the plurality of tab sheets 311 that are only gathered together at the free end 331 but not connected, so as to achieve the shaping of the tab group 33 and facilitate the subsequent connection with the adapter 35.

[0377] For example, the step of connecting one end of the adapter 35 to the tab group 33 in step S31 includes: step S311, connecting multiple tab sheets 311 of the tab group 33 at the position of the laminated portion 312 to form a first gathered portion 332; step S312, connecting at least part of the first gathered portion 332 to the adapter 35. It can be seen that the laminated portion 312 is pre-connected first, so that the laminated portion 312 forms a first gathered portion 332 with a certain rigidity, rather than a fluffy and scattered multi-layer foil form, which facilitates the connection between the first gathered portion 332 and the adapter 35, and makes the welding between the tab portion 33 and the adapter 35 more reliable, and it is not easy to form pores in the weld, which can improve the connection reliability and conductivity of the weld, and make the conductivity of the battery cell component 3 and the pole column component 2 more stable and reliable. The multi-layered electrode tabs 311 in the first gathered portion 332 are electrically connected, that is, the multi-layered electrode tabs 311 in the first gathered portion 332 are not only stacked, but also connected and conductive.

[0378] For another example, the step of connecting one end of the adapter 35 to the tab group 33 in step S31 includes: step S313, connecting at least part of the laminated portion 312 to the adapter 35. It can be seen that the laminated portion 312 can also be directly connected to the adapter 35 without pre-connection, which is conducive to simplifying the processing process and improving the processing efficiency. When the laminated portion 312 is connected to the adapter 35, the laminated portion 312 forms the first gathered portion 332, which can also achieve reliable connection between the laminated portion 312 and the adapter 35.

[0379] It can be understood that in the above scheme, no matter whether the first gathering portion 332 is connected to the adapter 35 or the stacked portion 312 is connected to the adapter 35, the connection position can make it possible for at least a portion of the first gathering portion 332 to be connected to a side of a portion of the adapter 35 that is away from the battery cell body 32 after the pole component 2 is installed on the first shell wall 111, so that the adapter 35 can prevent the free end 331 from moving toward the battery cell body 32.

[0380] In addition, in the above scheme, when there is only one battery cell body 32, all the pole tabs 311 of the battery cell body 32 are gathered to form a stacking portion 312 at the free end 331; when multiple battery cell bodies 32 constitute a group of battery cell groups 32A, and the battery cell groups 32A are a group, the pole tabs 311 of the battery cell groups 32A are gathered to form a stacking portion 312 at the free end 331; and when there are multiple groups of battery cell groups 32A, the pole tabs 311 of each group of battery cell groups 32A are gathered to form a stacking portion 312 at the free end 331, and at this time, there can be multiple stacking portions 312, each of which is connected to the adapter 35, or each stacking portion 312 forms a first gathering portion 332 and then is connected to the adapter 35.

[0381] In the above scheme, if there are multiple battery cell bodies 32, before connecting the tab resistor 3 with the adapter 35, multiple battery cell bodies 32 are stacked first, and several tab sheets 311 of the same polarity of multiple battery cell bodies 32 in the same battery cell group 32A are gathered together to form a stacking portion 312. Compared with the technical scheme of individually gathering the tab sheets 311 of each battery cell body 32 to form a stacking portion 312, and individually connecting the stacking portion 312 of each battery cell assembly 31 to the conductive member 41, and then stacking multiple battery cell bodies 32, on the one hand, the total number of stacking portions 312 and adapters 35 can be reduced, the connection steps of the stacking portion 312 and the adapter 35 can be reduced, and the processing efficiency can be improved. On the other hand, it can avoid the problem of tensile stress formed between the tab sheets 311 of different battery cell bodies 32 when the stacking portion 312 and the conductive member 41 are connected first and the battery cell bodies 32 are stacked, which causes cracks at the connection position between the tab group 33 and the battery cell body 32.

[0382] It can be understood that no matter the free end 331 is connected to the adapter 35 in the form of the stacked portion 312 or in the form of the first gathered portion 332, the free end 331 and the adapter 35 can be stacked along the thickness direction of the free end 331 to facilitate the matching and connection between the free end 331 and the adapter 35.

[0383] In the above scheme, no matter there are one or more battery cell bodies 32 and in what form the free end 331 is connected to the adapter 35 , it is applicable to both the scenario where the shell cover 12 serves as the first shell wall 111 and the scenario where the shell body 11 includes the first shell wall 111 .

[0384] Please refer to Fig.37A , Fig.37B and Fig.42 In some embodiments, the end of the adapter 35 away from the pole body 21 has a clamping structure 356, and the clamping structure 356 includes two clamping parts 3561 arranged opposite to each other; at this time, the step of connecting one end of the adapter 35 to the pole lug group 33 in step S31 includes: step S314, clamping the free end 331 with the two clamping parts 3561 from both sides of the free end 331; step S315, connecting both clamping parts 3561 to the free end 331.

[0385] It is understandable that the free end 331 can cooperate with the clamping structure 356 in the form of the laminated portion 312, or in the form of the first gathered portion 332. Thus, the two clamping portions 3561 can protect the free end 331, so as to improve the problem that the free end 331 is easy to crack during the connection process with the clamping structure 356, and improve the connection reliability between the adapter 35 and the tab assembly 33.

[0386] Exemplarily, before the clamping structure 356 is engaged with the free end 331, the two clamping parts 3561 are first opened, for example, one of the clamping parts 3561 is flipped in a direction away from the other clamping part 3561 to increase the angle between the two clamping parts 3561, so as to facilitate the free end 331 to be quickly engaged between the two clamping parts 3561; then the free end 331 is engaged between the two clamping parts 3561, and the angle between the two clamping parts 3561 is reduced, so that the two clamping parts 3561 are clamped on both sides of the thickness of the free end 331, and then the clamping structure 356 is connected to the free end 331.

[0387] Please refer to Fig.43 In some embodiments, the adapter 35 includes a plurality of adapter foils 350. At this time, before connecting one end of the adapter 35 to the tab group 33 in step S31, it also includes: step S10b, stacking the plurality of adapter foils 350; step S10c, connecting the stacked partial areas to form a first connection portion 351, so as to achieve the connection of the plurality of adapter foils 350, improve the compactness of the adapter foil 350 in the first connection portion 351, and facilitate the connection of the adapter 35 to the pole component 2. Step S31, connecting one end of the adapter 35 to the tab group 33 and the other end to the pole body 21 includes: step S316, connecting the stacked partial areas of the plurality of adapter foils 350 to the free end 331, so that the stacked partial areas form a second connection portion 352 spaced from the first connection portion 351; step S317, connecting the first connection portion 351 to the pole body 21.

[0388] It can be seen that in the above scheme, "connecting the plurality of transition foils 350 to the free end 331" and "connecting the stacked partial areas of the plurality of transition foils 350 to form the second connection portion 351" can be performed simultaneously, which is conducive to simplifying the processing process. The order of "forming the second connection portion 352" (connecting the stacked partial areas of the plurality of transition foils 350 to the free end 331 so that the stacked partial areas form the second connection portion 352 spaced from the first connection portion 351) and "connecting the first connection portion 351 to the pole body 21" is not specifically limited.

[0389] Of course, in other embodiments of the present application, when the adapter 35 includes multiple adapter foils 350, the step of connecting one end of the adapter 35 to the pole lug group 33 and the other end to the pole body 21 can also be constructed to include: connecting the stacked partial areas of the multiple adapter foils 350 to form a second connection part 352, and then connecting the second connection part 352 to the free end 331; that is, "connecting the multiple adapter foils 350 to the free end 331" and "connecting the stacked partial areas of the multiple adapter foils 350 to form the second connection part 351" are performed separately and successively.

[0390] It can be understood that, in the above scheme, whether the stacked partial area of ​​the plurality of transfer foils 350 is connected to the free end 331 so that the stacked partial area forms a second connection portion 352 spaced apart from the first connection portion 351, or the second connection portion 352 is formed first and then the second connection portion 352 is connected to the free end 331, the free end 331 can be connected in the form of a stacked portion 312, or the free end 331 can also be connected in the form of a first gathered portion 332.

[0391] Please refer to Fig.37E , Fig.39D and Fig.44 In some embodiments, step S32, the step of covering the pole component 2 connected with the adapter 35 in the mounting hole 112 from the inner side or the outer side of the first shell wall 111, includes step S30a, when the pole component 2 is installed in the first shell wall 111, the portion located between the first shell wall 111 and the battery body 32 after the pole lug group 33 and the adapter 35 are connected is bent. In some other embodiments, step S34, the step of covering the pole component 2 connected with the adapter 35 in the mounting hole 112 from the inner side or the outer side of the first shell wall 111 after passing through the mounting hole 112, includes step S30a, when the pole component 2 is installed in the first shell wall 111, the portion located between the first shell wall 111 and the battery body 32 after the pole lug group 33 and the adapter 35 are connected is bent.

[0392] Therefore, no matter which of the above situations is the case, the conductive part 4 formed by the pole lug group 33 and the adapter 35 can play a buffering role. When the battery cell 102 is used in a vibration environment, the impact of the battery cell body 32 toward the first shell wall 111 can be reduced, thereby protecting the battery cell component 3 and improving the reliability of the battery cell 102. In addition, the pole component 2 is installed before the first shell wall 111, and the part located between the first shell wall 111 and the battery cell body 32 after the pole lug group 33 and the adapter 35 are connected can be basically in an unfolded state, which is convenient for connecting the pole lug group 33 with the adapter 35, and / or, the adapter 35 with the pole body 21, and is convenient for having sufficient operating space, for example, it is convenient to lay the part of the adapter 35 connected to the pole body 21 on the pole body 21 for connection.

[0393] In the above scheme, when the pole component 2 is installed on the first shell wall 111, the portion between the first shell wall 111 and the battery body 32 after the pole lug group 33 and the adapter 35 are connected is bent, which may include but is not limited to shaping the portion between the pole lug group 33 and the adapter 35 between the first shell wall 111 and the battery body 32 so that the above portion is bent. The shaping method and time are not limited. For example, it can be performed in conjunction with the covering action of the pole component 2 to the first shell wall 111, or in conjunction with the covering action of the first pole component 21a to the second pole component 21b, thereby improving the processing efficiency. Of course, when the pole component 2 is installed on the first shell wall 111, it is also unnecessary to shape the portion between the pole lug group 33 and the adapter 35 between the first shell wall 111 and the battery body 32. Since the installation of the pole component 2 reduces the space, the pole lug group 33 and the adapter 35 are subjected to external force and bend at a relatively weak position.

[0394] It can be understood that after the tab group 33 and the adapter 35 are connected, the portion between the first shell wall 111 and the battery body 32 is bent. After the process is completed, the current state of the battery cell 102 can be: the tab group 33 is bent to form at least one open groove (including the first open groove 334), and / or the adapter 35 is bent to form the second open groove 355. For example, after the above process is completed, the tab group 33 is bent to form the first open groove 334, and the adapter 35 is bent to form the second open groove 355, and the conductive part 4 is roughly in a reciprocating serpentine shape, which can simplify the above steps, shorten the length of the conductive part 4, simplify the structure of the conductive part 4, and facilitate the processing of the conductive part 4.

[0395] Please combine Figure 37A-Figure 37E , Fig.45 In some embodiments, the battery cell 102 includes an insulating support 42 located on the inner side of the first shell wall 111. The insulating support 42 can be arranged on a side of the battery cell component 3 close to the pole component 2. The insulating support 42 has a through hole 40, and the tab group 33 is arranged in the through hole 91. At this time, step S30a, when the pole component 2 is installed on the first shell wall 111, the step of making the portion located between the first shell wall 111 and the battery cell body 32 after the tab group 33 and the adapter 35 are connected to be bent includes: step S30a. Step S301, when the pole component 2 is installed on the first shell wall 111, the portion located between the first shell wall 111 and the battery cell body 32 after the pole lug group 33 and the adapter 35 are connected is bent to form a first opening groove 334, and the free end 331 defines at least a portion of the groove wall on one side of the first opening groove 334 close to the pole body 21; Step S302, a portion of the insulating bracket 42 is inserted into the first opening groove 334, so that the insulating bracket 42 can prevent the free end 331 from moving toward the battery cell body 32.

[0396] Exemplarily, “bending the portion between the first shell wall 111 and the battery cell body 32 after the tab group 33 and the adapter 35 are connected to form the first opening groove 334 ” and “partially inserting the insulating bracket 42 into the first opening groove 334 ” can be performed simultaneously.

[0397] Please refer to Fig.37D , Fig.37E and Fig.46 In some embodiments, the battery cell 102 includes an insulating bracket 42 located inside the first shell wall 111; step S30a, when the pole component 2 is installed on the first shell wall 111, the portion located between the first shell wall 111 and the battery body 32 after the pole lug group 33 and the adapter 35 are connected is bent to form a first portion. An opening groove 334, and a second opening groove 355 adjacent to the first opening groove 334 and located on the side of the first opening groove 334 facing the pole body 21, the opening directions of the second opening groove 355 and the first opening groove 334 are arranged at an angle; step S304, part of the insulating bracket 42 is inserted into the first opening groove 334 and the second opening groove 355, so that the insulating bracket 42 can prevent the free end 331 from moving toward the battery cell body 32, and at the same time, the insulating bracket 42 can also prevent the adapter 35 from moving toward the battery cell body 32.

[0398] Exemplarily, when the cell body 32 connected to the conductive part 4 is located on the inner side of the insulating bracket 42, and the pole part 2 connected to the conductive part 4 is located on the outer side of the first shell wall 111, "making the conductive part 4 located between the pole part 2 and the cell body 32 bend and deform into a first opening groove 334 and a second opening groove 355 with openings facing in opposite directions" may specifically include: accompanying the action of covering the pole part 2 in the direction of the first shell wall 111, the conductive part 4 forms two opening grooves 42 with openings facing in opposite directions on the inner and outer sides of the insulating bracket 42, that is, the conductive part 4 forms an opening groove (i.e., the first opening groove 421) on the inner side of the insulating bracket 42, and the conductive part 4 forms another opening groove (i.e., the second opening groove 422) on the outer side of the insulating bracket 42. Thus, by providing the insulating bracket 42, it is convenient for the conductive part 4 to bend out the first opening groove 334 and the second opening groove 355 with openings facing in opposite directions, thereby reducing the difficulty of processing.

[0399] Please refer to Fig.47In some embodiments, in step S31 and / or step S33, the step of connecting the other end of the adapter 35 to the pole body 21 includes: step S30b, adjusting the angle of the pole component 2 so that the normal direction of the inner end surface 211 of the pole body 21 is close to the stacking direction of the multiple battery cell bodies 32. In step S32 and / or step S34, the step of covering the pole component 2 connected with the adapter 35 on the mounting hole 112 includes: step S30c, adjusting the angle of the pole component 2 on the outer side of the first shell wall 111 so that the normal direction of the inner end surface 211 of the pole body 21 is close to the stacking direction (for example, the fourth direction F4) of the multiple battery cell bodies 32, and the tab group 33 is bent and deformed to form the first opening groove 334, and the adapter 35 is bent and deformed to form the second opening groove 355, and the opening directions of the first opening groove 334 and the second opening groove 355 are arranged at an angle, so that the conductive part 4 is roughly in a serpentine shape.

[0400] In this embodiment, the step of stacking the plurality of battery cell bodies 32 may be performed before the adapter 35 is connected to the pole component 2 , or may be performed after the adapter 35 is connected to the pole component 2 .

[0401] The “normal direction of the inner end face 211 of the pole body 21 is close to the stacking direction of the multiple battery cell bodies 32” means that the normal direction of the inner end face 211 of the pole body 21 is consistent or substantially consistent with the stacking direction of the multiple battery cell bodies 32. Substantially consistent can be understood as a small angle between the two, for example, less than 10°. The “arrangement of the pole component 2 on the side of the protruding pole ear group 33 of the battery cell component 3” can be understood as: the pole ear group 33 is located on one side of the battery cell body 32, and the pole component 2 and the pole ear group 33 are arranged on the same side of the battery cell body 32, which is conducive to shortening the length of the pole ear portion 33. In the above technical solution, the “length of the pole ear portion 33” is such that: when the normal direction of the inner end face 211 of the pole body 21 of the pole component 2 is close to the stacking direction of the multiple battery cell assemblies 31, the pole component 2 can be located on the side of the protruding pole ear portion 33 of the battery cell component 3, and the adapter 35 can be laid on the inner end face 211 of the pole body 21.

[0402] In the above technical solution, the position and angle of the pole component 2 are first adjusted so that the normal direction of the inner end face 211 of the pole body 21 is close to the stacking direction of multiple battery cell assemblies 31, and then the part of the adapter 35 connected to the pole body 21 is laid on the inner end face 211 of the pole body 21. After that, there is no need to adjust the angle of the pole body 21, so that there is enough space near the matching position between the part of the adapter 35 connected to the pole body 21 and the inner end face 211 of the pole body 21 for welding the adapter 35 and the pole body 21, thereby simplifying the operation and making the length of the pole ear portion 33 shorter. Then, when the angle of the pole component 2 is adjusted to connect with the first shell wall 111, the conductive portion 4 can be bent to form the first opening groove 334 and the second opening groove 355.

[0403] Please refer again Fig.48 In some embodiments, the shell component 1 includes a shell body 11 and a shell cover 12, and the shell body 11 has an opening 113; when the end wall of the shell body 11 opposite to the opening 113 is the first shell wall 111, step S20, loading the battery core component 3 into the accommodating cavity 13, and arranging the battery core component 3 on the inner side of the first shell wall 111 and opposite to the first shell wall 111 includes: step S21, loading the battery core component 3 into the accommodating cavity 13 from the opening 113; step S22, extending the pole lug group 33 from the mounting hole 113, so that one end of the battery core component 3 where the pole lug group 33 is arranged is on the inner side of the first shell wall 111 and opposite to the first shell wall 111; step S23, covering the shell cover 12 on the opening 113.

[0404] In the above scheme, “loading the battery core component 3 into the accommodating cavity 13, and arranging the battery core component 3 on the inner side of the first shell wall 111 and opposite to the first shell wall 111” may include: adjusting the relative positions of the shell body 11, the battery core component 3 and the conductive part 4 so that the battery core component 3 is located on the side of the adapter 35 connected thereto away from the shell body 11, and the opening 113 of the shell body 11 faces the adapter 35, and then loading the battery core component 3 and the adapter 35 into the shell body 11 from the opening 113. There is no specific restriction on the order of “loading the battery core component 3 into the accommodating cavity 13 from the opening 113” and “extending the tab group 33 from the mounting hole 113 so that one end of the battery core component 3 where the tab group 33 is arranged is on the inner side of the first shell wall 111 and opposite to the first shell wall 111”, for example, both can be performed simultaneously.

[0405] Therefore, by arranging the pole component 2 at the end of the shell body 11 opposite to the opening 113, it is helpful to improve the cracking problem at the connection between the shell body 11 and the shell cover 12, and improve the reliability of the battery cell 102. Among them, "adjusting the relative positions of the shell body 11, the battery core component 3 and the conductive part 4" can be achieved by adjusting the position of the shell body 11, and can also be achieved by adjusting the positions of the battery core component and the conductive part; "installing the battery core component 3 and the adapter 35 into the shell body 11 from the opening 113" can be achieved by pushing the battery core component, and can also be achieved by inserting the shell body.

[0406] For example, the action of the adapter 35 passing through the mounting hole 112 to the outside of the first shell wall 111 can be achieved as the battery core component 3 is installed into the shell body 11. That is, the action of the adapter 35 passing through the mounting hole 112 is completed as the battery core component 3 is installed into the shell body 11, which makes the operation convenient and improves the processing efficiency.

[0407] Exemplarily, when assembling the battery cell 102, the tab group 33 can be first connected to the adapter 35 to form the conductive part 4, and then the battery cell component 3 is installed into the shell body 11 with the conductive part 4 facing the mounting hole 112 relative to the battery cell body 32. As the battery cell component 3 moves into the shell body 11, the conductive part 4 passes through to the outside of the mounting hole 112, and the conductive part 4 is connected to the pole column component 2 disposed on the outside of the first shell wall 111 on the outside of the first shell wall 111. Then, the pole column component 2 connected with the conductive part 4 is covered on the mounting hole 112 from the outside of the first shell wall 111, and then the pole column component 2 covering the mounting hole 112 is connected to the first shell wall 111.

[0408] Please refer to Fig.49 , Figure 50A-50F In some embodiments, the shell component 1 includes a shell body 11 and a shell cover 12, and the shell body 11 has an opening 113; when the shell cover 12 is a first shell wall 111, step S20, loading the battery core component 3 into the accommodating cavity 13, and arranging the battery core component 3 on the inner side of the first shell wall 111 and opposite to the first shell wall 111 includes: step S24, supporting the battery core component 3 on the inner side of the shell cover 12; step S25, extending the pole ear group 33 from the mounting hole 112, so that one end of the battery core component 3 where the pole ear group 33 is arranged is on the inner side of the first shell wall 111 and opposite to the first shell wall 111; step S26, sleeve the shell body 11 on the outer side of the battery core component 3, and connect the shell body 11 to the shell cover 12.

[0409] For example, “connecting the adapter 35 extending outward from the first shell wall 111 to the pole body 21 of the pole component 2 disposed outside the first shell wall 111” can be performed after “connecting the shell body 11 to the shell cover 12” (e.g. Figure 50A-50Fas shown); or, in other embodiments of the present application, "connecting the conductive portion 4 extending outward from the first shell wall 111 to the pole body 21 of the pole component 2 disposed on the outside of the first shell wall 111" may also be performed before "putting the shell body 11 on the outside of the battery core component 3".

[0410] Thus, by first completing the connection between the shell body 11 and the shell cover 12, and then connecting the pole component 2 to the shell cover 12, the shell body 11 can be used to store the battery core component 3 and support the shell cover 12, so that it is convenient to position and support the shell cover 12, so as to facilitate the connection between the shell cover 12 and the adapter structure 22, and improve the connection reliability between the shell cover 12 and the pole component 2. Among them, the connection method between the shell body 11 and the shell cover 12 is not limited, for example, it can be welding, bonding, etc.

[0411] Exemplarily, “passing the adapter 35 through the mounting hole 112 to the outside of the first shell wall and connecting it to the pole body 21” can be performed after “connecting the shell body 11 to the shell cover 12”; or, in other embodiments of the present application, “connecting the adapter 35 passing through the outside of the first shell wall 111 to the pole body 21 of the pole component 2 disposed on the outside of the first shell wall 111” can also be performed before “putting the shell body 11 on the outside of the battery cell component 3”.

[0412] Therefore, by first completing the connection between the shell body 11 and the shell cover 12, and then connecting the pole component 2 to the shell cover 12, the shell body 11 can be used to store the battery core component 3 and support the shell cover 12, which makes it easy to position and support the shell cover 12, so as to facilitate the connection between the shell cover 12 and the adapter structure 22, thereby improving the connection reliability between the shell cover 12 and the pole component 2.

[0413] Please refer to Fig.48 In some embodiments, when the end wall of the shell body 11 opposite to the opening 113 is the first shell wall 111, before the cell component 3 is loaded into the accommodating cavity 13 from the opening in step S20, the method further includes step S27 of wrapping the insulating film 41 around the outer side of the cell body 32. Thus, the cell component 3 and the insulating film 41 are loaded into the shell together, which facilitates the installation of the insulating film 41 and facilitates the insulation installation of the cell component 3 and the shell component 1.

[0414] Please refer to Fig.49 In some embodiments, when the shell cover 12 is the first shell wall 111, before the shell body 11 is sleeved on the outer side of the battery core component 3 in step S26, a step S28 is further included to wrap the insulating film 41 on the outer side of the battery core body 32. In this way, the battery core component 3 and the insulating film 41 can be put into the shell together with the shell body 11 to facilitate the setting of the insulating film 41 and facilitate the insulation setting of the battery core component 3 and the shell component 1.

[0415] It can be understood that, when the shell cover 12 is the first shell wall 111, the order of "supporting the battery cell component 3 on the inner side of the shell cover 12" and "extending the pole tab group 33 from the mounting hole 112 so that one end of the battery cell component 3 on which the pole tab group 33 is arranged is arranged on the inner side of the first shell wall 111 and opposite to the first shell wall 111" and "wrapping the insulating film 41 on the outer side of the battery cell body 32" is not specifically limited, and it is only necessary to complete the covering of the insulating film 41 before the shell body 11 is sleeved on the outside of the battery cell component 3.

[0416] For example, please refer again to Figure 50A-50F In some embodiments of the present application, when the shell cover 12 is the first shell wall 111, the inner side of the shell cover 12 may have an insulating bracket 42. Before the shell body 11 is put on the outside of the battery cell component 3, the battery cell component 3 is placed so that the conductive part 4 connected to it faces downward, and the shell cover 12 is placed so that the insulating bracket 42 faces upward; the insulating film 41 is coated on the outside of the battery cell component 3 supported on the top of the insulating bracket 42, and the insulating film 41 is connected to the insulating bracket 42. At this time, the step of "putting the shell body 11 on the outside of the battery cell component 3" specifically includes: "placing the shell body 11 so that the opening 113 faces downward, and putting the shell body 11 on the outside of the battery cell component 3 coated with the insulating film 41 from top to bottom".

[0417] Among them, the step of "placing the battery core component 3 so that the conductive part 4 connected to it faces downward, and placing the shell cover 12 so that the insulating bracket 42 faces upward" can be performed before "the other end of the adapter 35 passes through the mounting hole 112 to the outside of the first shell wall 111", or, it can also be performed after "the other end of the adapter 35 passes through the mounting hole 112 to the outside of the first shell wall 111".

[0418] The process of “covering the insulating film 41 on the outer surface of the cell component 3 supported on the top of the insulating support 42 so as to connect the insulating film 41 with the insulating support 42” is performed when the insulating support 42 is supported on the bottom of the cell body 32 and the adapter 35 passes through the mounting hole 112 to the outside of the first shell wall 111. In this state, the cell component 3 does not need other clamps to support and limit, which is conducive to quick operation.

[0419] In the above technical solution, when the shell cover 12 is the first shell wall 111, when the shell body 11 is inserted into the outer surface of the battery core component 3, since the shell cover 12 is not connected to the battery core component 3, an insulating bracket 42 is provided on the inner side of the shell cover 12 (i.e., the side away from the battery core body 32) to support the battery core component 3 from the bottom of the battery core component 3. In this way, no other limiting clamps are required, and the problem of separation of the battery core component 3 and the shell cover 2 can be avoided. Therefore, during assembly, it is only necessary to directly insert the shell body 11 from top to bottom, thereby simplifying the assembly process and reducing the use of limiting clamps and the like.

[0420] Please refer again Figure 50A-50FIn some embodiments of the present application, when the shell cover 12 is the first shell wall 111, when assembling the battery cell 102, the following steps can be performed in sequence: "place the battery cell component 3 so that the conductive part 4 connected to it faces downward, and place the shell cover 12 so that the insulating bracket 42 faces upward", "place the battery cell component 3 and the conductive part 4 connected to the battery cell component 3 on the inner side of the first shell wall 111, and pass the conductive part 4 through the mounting hole 112 to the outer side of the first shell wall 111", "cover the battery cell component 3 supported on the top of the insulating bracket 42 with the insulating film 41, so that the insulating film 41 is connected to the insulating bracket 42 ... insulating bracket 42" The shell body 11 is placed so that the opening 113 faces downward, and the shell body 11 is put on the outside of the battery core component 3 covered with the insulating film 41 from top to bottom", "the shell body 11 is connected to the shell cover 12", "the conductive part 4 that passes through the outside of the first shell wall 111 is connected to the pole body 21 of the pole component 2 placed on the outside of the first shell wall 111", "the pole component 2 connected to the conductive part 4 is covered on the mounting hole 112 from the outside of the first shell wall 111, so that the adapter structure 22 stops at the outside of the first shell wall 111", "the adapter structure 22 is connected to the first shell wall 111 from the outside".

[0421] For example, please refer again to Figure 50A-50F When assembling the battery cell 102, a plurality of electrode assemblies 31 are stacked along the thickness direction (e.g., the fourth direction F4) of the electrode assembly 31, and a binding member 8 (e.g., blue glue) is used to bind the stacked plurality of electrode assemblies 31, and a plurality of multi-layered pole tabs 311 of the plurality of electrode assemblies 31 with the same polarity are stacked and gathered to form a stacked portion 312, and the stacked portion 312 is sandwiched between two clamping portions 4110 of the conductive member 41, and the stacked portion 312 and the clamping portion 4110 are welded and connected, thereby obtaining a structure consisting of the pole tab portion 312. 3 and the conductive member 41, the shell cover 12 is placed below the battery body 32, and the shell cover 12 is placed so that the insulating support 42 faces upward, the battery body 32 is supported above the insulating support 42, and then the insulating film 41 is covered on the outside of the battery body 32, and the lower end of the insulating film 41 is connected to the insulating support 42 by hot melting; then, the shell body 11 is placed so that the opening 113 faces downward, the shell body 11 is put on the outside of the battery body 32 from top to bottom, and the lower end of the shell body 11 is welded to the shell cover 12. Afterwards, the shell body 11 is laid flat, the mounting hole 112 is opened in the horizontal direction, the conductive part 4 is connected to the pole component 2 placed on the outside of the shell cover 12 on the outside of the shell cover 12, and then the pole component 2 connected to the conductive part 4 is covered in the mounting hole 112 from the outside of the shell cover 12; then the shell body 11 is turned over so that the shell cover 12 is located above the shell body 11, the pole component 2 is located on the top of the shell cover 12, and the adapter structure 22 is welded and fixed to the shell cover 12.

[0422] In addition, in the embodiment of the present application, since the connection between the cell component 3 and the pole component 2 is completed first, and then the pole component 2 and the shell component 1 are assembled and connected, rather than pre-installing the pole component and the shell component first and then connecting the cell component and the pole component, this is conducive to shortening the length of the conductive part 4 connecting the pole component 2 and the cell component 3, reducing the redundancy of the conductive part 4 in the shell component 1, and reducing the space occupied by the conductive part 4 in the shell component 1, which is conducive to improving the energy density of the battery cell 102, and is conducive to reducing the risk of the conductive part 4 being inserted into the cell body 32 of the cell component 3 and causing a short circuit, thereby improving the reliability of the battery cell 102. In addition, this assembly method can realize the assembly of the battery cell 102 regardless of whether the pole component 2 is set on the shell body 11 or the pole component 2 is set on the shell cover 12, so the installation position of the pole component 2 can be flexibly selected on the shell component 1. When the pole component 2 is disposed on the shell body 11 , it is beneficial to reduce the cracking problem at the connection between the shell body 11 and the shell cover 12 , and improve the reliability of the battery cell 102 .

[0423] When the end wall of the shell body 11 opposite to the opening 113 is used as the first shell wall 111, if the pole component is first installed on the first shell wall and then the battery core component is installed into the shell body, it is difficult to connect the battery core component with the pole component. In the embodiment of the present application, the connection between the cell component 3 and the pole component 2 is first performed, and then the pole component 2 is connected to the shell component 1, so that the connection requirements between the cell component 3 and the pole component 2 and the connection requirements between the pole component 2 and the shell component 1 can be met; when the battery 100 vibrates or deforms, the pole components 2 connected by the busbar component will be pulled against each other. Since the pole component 2 is arranged on the first shell wall 111 opposite to the shell body 11 and the opening 113, the force applied to the pole component 2 will be preferentially transmitted to the shell body 11, and will not directly act on the shell cover 12, so that not only can the distance for the force to be transmitted to the connection between the shell body 11 and the shell cover 12 (such as the weld) be extended, but also the shell body 11 will preferentially deform when subjected to force, so as to reduce the force applied to the connection between the shell body 11 and the shell cover 12, thereby effectively reducing the probability of cracking at the connection between the shell cover 12 and the shell body 11 during the use of the battery 100, and improving the reliability of the battery cell 102. Furthermore, since the connection between the shell body 11 and the shell cover 12 is not prone to cracking, there is no need to increase the wall thickness of the shell body 11 and the shell cover 12 in order to increase the reliability of the connection between the two, which is beneficial to reducing weight and material costs.

[0424] When the shell cover 12 is used as the first shell wall 111, if the pole component is first installed on the shell cover, and then the pole component and the battery cell component are connected, when connecting the pole component and the battery cell component, the length of the conductive part needs to be set relatively long (for example, greater than half the width of the shell cover), so that the battery cell component can be located on one side in the width direction of the shell cover, so that the length of the conductive part is longer, and the redundancy of the conductive part after assembly is more, which is easy to cause the risk of reverse insertion into the active material coating part and causing a short circuit. In the embodiment of the present application, by first connecting the pole component 2 and the battery cell component 3, and then installing the pole component 2 on the shell cover 12, when connecting the pole component 2 and the battery cell component 3, the length of the conductive part 4 is such that the battery cell component 3 can be located on one side in the width direction of the pole component 2, thereby shortening the length of the conductive part 4 (for example, greater than half the width of the pole component 2), reducing the redundancy of the conductive part 4 after assembly, reducing the risk of reverse insertion of the conductive part 4 into the battery cell body 32 and causing a short circuit, improving the reliability of the battery cell 102, and reducing the material and cost of the conductive part 4.

[0425] It can be seen that the above-mentioned arrangement of the embodiment of the present application makes the assembly position of the pole component 2 on the shell component 1 unrestricted. The pole component 2 can be set on the shell body 11 or on the shell cover 12. The installation position of the pole component 2 can be flexibly selected on the shell component 1, which is conducive to meeting the production requirements of different types of battery cells 102. Among them, when the pole component 2 is set on the shell body 11, it is conducive to improving the cracking problem at the connection between the shell body 11 and the shell cover 12, and improving the reliability of the battery cell 102. Among them, when the pole component 2 is set on the shell cover 12, it is conducive to shortening the length of the conductive part 4, reducing the redundancy of the conductive part 4 after assembly, reducing the risk of reverse insertion, and improving the reliability of the battery cell 102.

[0426] In a third aspect, the embodiment of the present application provides a battery 100, including the above-mentioned battery cell 102. It is worth noting that the battery 100 according to the embodiment of the present application may include a box body 101, or may not include a box body 101. Since the reliability of the battery cell 102 according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery 100.

[0427] Exemplarily, the battery 100 may further include a busbar component, and the battery cells 102 are multiple and at least two are electrically connected through the busbar component. Thus, the series connection and / or parallel connection of multiple battery cells 102 can be achieved. For example, when multiple battery cells 102 are connected in series, the pole component 2 of the positive electrode of one battery cell 102 is connected to the pole component 2 of the negative electrode of the next battery cell 102 through a busbar component, and at the same time, the pole component 2 of the negative electrode of the battery cell 102 is connected to the pole component 2 of the positive electrode of the previous battery cell 102 through another busbar component.

[0428] For example, in combination Figure 2 The battery 100 includes a box body 101, a plurality of battery cells 102 are contained in the box body 101, and the bottom of the box body 101 is a box body bottom plate 1013. The battery core component 3 is arranged on the side of the shell component 1 facing the box body bottom plate 1013, or on the side of the shell component 1 away from the box body bottom plate 1013.

[0429] When the battery 100 is in use, for example, when it is used in a vehicle, the bottom plate 1013 of the box is located at the bottom of the box 101 in the direction of gravity. Thus, when the battery cell component 3 is arranged on the side of the shell component 1 facing the bottom plate 1013 of the box, it means that the battery cell component 3 is located at the bottom of the shell component 1 in the direction of gravity; and when the battery cell component 3 is arranged on the side of the shell component 1 away from the bottom plate 1013 of the box, it means that the battery cell component 3 is located at the top of the shell component 1 in the direction of gravity. Therefore, the relative position of the pole component 2 and the bottom plate 1013 of the box is not limited, and the orientation of the battery cell 102 and the box 101 can be flexibly set.

[0430] In a fourth aspect, an embodiment of the present application provides an electric device 1000, comprising a battery 100 of any of the above solutions, and the battery 100 is used to provide electric energy to the electric device 1000. The electric device 1000 may be any of the above-mentioned devices or systems using the battery 100. Since the performance of the battery 100 is improved, it is beneficial to improve the working power performance of the electric device 1000.

[0431] The following describes several specific embodiments of the battery cell 102 and the assembly method thereof.

[0432] Embodiment 1

[0433] Combination Figure 37A-Figure 37E The shell component 1 has a receiving cavity 13, and includes a shell body 11 that participates in forming the receiving cavity 13, one end of the shell body 11 has an opening 113, the shell cover 12 is flat and covers the opening 113, the end of the shell body 11 opposite to the opening 113 is a first shell wall 111, and the first shell wall 111 has a mounting hole 112; the pole component 2 is mounted on the first shell wall 111, and covers the mounting hole 112. The battery core component 3 includes a plurality of stacked battery core assemblies 31, so as to have a battery core body 32 accommodated in the receiving cavity 13, and a tab group 33 connected to the battery core body 32, the tab group 33 is connected to the pole component 2 through an adapter 5, and a part of the adapter 5 is received in the receiving groove 5 surrounded by the pole component 2. The pole component 2 is in a very simple form, including a pole body 21, a transition structure 22, and an insulating structure 23. The transition structure 22 surrounds the pole body 21, and the insulating structure 23 is insulated and fitted between the pole body 21 and the transition structure 22. The transition structure 22 is connected to the first shell wall 111, and the pole body 21 is connected to the pole lug group 33.

[0434] Combination Figure 37A-Figure 37E When processing the battery cell 102, a plurality of battery cell assemblies 31 are stacked along the thickness direction of the battery cell assembly 31 (for example, the fourth direction F4), and the multi-layered pole tab sheets 311 of the plurality of battery cell assemblies 31 with the same polarity are stacked and connected to form a first gathering portion 332, and then the first gathering portion 332 is connected to the adapter 35, and the battery cell component 3 is installed into the shell body 11 according to the direction of the pole tab group 33 relative to the battery cell body 32 toward the mounting hole 112. As the battery cell component 3 moves into the shell body 11, the adapter 35 is passed out to the outside of the mounting hole 112, and the adapter 35 is connected to the pole column component 2 disposed on the outside of the first shell wall 111 on the outside of the first shell wall 111, and then the pole column component 2 connected with the adapter 35 is covered with the mounting hole 112 from the outside of the first shell wall 111, and then the adapter structure 22 is welded and fixed to the first shell wall 111.

[0435] The welding position between the pole component 2 and the retracted portion 313 is located outside the shell body 11 , which can improve the problem of conductive scraps formed during welding entering the shell body 11 and causing damage to the battery core component 3 .

[0436] Embodiment 2

[0437] Combination Figure 39A-Figure 39D The shell component 1 has a receiving cavity 13, and includes a shell body 11 that participates in forming the 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, and the first shell wall 111 has a mounting hole 112; the pole component 2 is installed on the first shell wall 111, and the cover is arranged at the mounting hole 112. The battery core component 3 includes a plurality of stacked battery core assemblies 31, so as to have a battery core body 32 accommodated in the receiving cavity 13, and a tab group 33 connected to the battery core body 32, and the tab group 33 is connected to the pole component 2. The pole component 2 includes a pole core body 21, a transition structure 22, and an insulating structure 23, the transition structure 22 surrounds the pole core body 21, the insulating structure 23 is insulated and matched between the pole core body 21 and the transition structure 22, the transition structure 22 is connected to the first shell wall 111, and the pole core body 21 is connected to the tab group 33.

[0438] Combination Figure 39A-Figure 39DWhen processing the battery cell 102, a plurality of battery cell assemblies 31 are stacked along the thickness direction of the battery cell assembly 31 (for example, the fourth direction F4), and the multi-layered pole ear sheets 311 of the plurality of battery cell assemblies 31 with the same polarity are stacked and connected to form a first gathering portion 332, and then the first gathering portion 332 is connected to the pole component 2 through the adapter 35, and the battery cell component 3 and the pole component 2 connected to the first gathering portion 332 are installed into the shell body 11 according to the direction of the pole component 2 relative to the battery cell body 32 toward the mounting hole 112. As the battery cell component 3 moves into the shell body 11, the pole component 2 passes through the mounting hole 112 to the outside of the first shell wall 111, and then the pole component 2 connected with the gathering portion 313 is covered with the mounting hole 112 from the outside of the first shell wall 111, and then the adapter structure 22 is welded and fixed to the first shell wall 111.

[0439] The pole component 2 and the retracted portion 313 are not yet installed in the shell body 11 during welding, which can improve the problem of conductive chips formed during welding entering the shell body 11 and causing damage to the battery core component 3.

[0440] It is worth noting that the form of the transition structure 22 of the pole component 2 in the above embodiment is not limited, the form of the insulating structure 23 is not limited, and the form of the pole body 21 is not limited. Any of the above embodiments of the present application can be referred to and will not be elaborated here.

[0441] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0442] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A shell component having a receiving cavity and comprising a first shell wall participating in defining the receiving cavity; A pole component, mounted on the first shell wall, and comprising a pole body; The battery core component comprises a battery core body and an adapter. The battery core body is arranged in the accommodating cavity and is connected to a tab group at its end. The tab group is electrically connected to the pole column body through the adapter. The adapter supports the free end of the tab group.

2. The battery cell according to claim 1, characterized in that: The tab group includes a plurality of tab sheets, which are gathered and connected at a position away from the battery cell body to form a first gathered portion at the free end, and at least a portion of the first gathered portion is connected to a portion of the adapter at a position away from the battery cell body.

3. The battery cell according to claim 2, characterized in that: The adapter includes a first connecting portion and a second connecting portion, wherein the first connecting portion is connected to the pole component, and the second connecting portion is connected to the first retracted portion and supports the first retracted portion. The orthographic projection of at least a portion of the first gathered portion on the first shell wall is located within the orthographic projection range of the second connecting portion on the first shell wall, and the thickness of the second connecting portion is greater than or equal to the thickness of the first gathered portion.

4. The battery cell according to claim 2 or 3, characterized in that: The multiple pole tabs of the pole tab group converge near the position of the battery cell body to form a second gathering portion, one end of the second gathering portion is bent and connected to the first gathering portion, and the other end is connected to the battery cell body, and the end surface of the portion of the adapter connected to the first gathering portion extends to a position close to the bending position of the second gathering portion.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The tab group is bent to form a first open slot, the free end defines at least a portion of a slot wall of the first open slot close to the pole body, and the adapter extends into the first open slot and abuts against the free end.

6. The battery cell according to claim 5, characterized in that: The adapter is bent to form a second opening slot adjacent to the first opening slot and located on a side of the first opening slot facing the pole body, and the opening directions of the second opening slot and the first opening slot are arranged at an angle.

7. The battery cell according to any one of claims 1 to 6, characterized in that: One end of the adapter away from the pole body has a clamping structure, the clamping structure supports the free end and includes two clamping parts arranged opposite to each other, the free end is clamped between the two clamping parts and connected to each of the clamping parts.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The adapter includes a first connection portion, a bending portion and a second connection portion, the first connection portion and the second connection portion are opposite to each other, the bending portion is bent and connected between the first connection portion and the second connection portion, the first connection portion is connected to the pole body, and the second connection portion supports the free end.

9. The battery cell according to claim 8, characterized in that: The thickness of the bending portion is smaller than the thickness of at least one of the first connecting portion and the second connecting portion; and / or, In an extending direction of a central axis of the bending portion, a width of the bending portion is smaller than a width of at least one of the first connecting portion and the second connecting portion.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The adapter comprises a plurality of adapter foils, which are stacked and partially connected to form a first connection portion and a second connection portion which are spaced apart. The first connection portion is connected to the pole body, and the second connection portion is connected to the free end.

11. The battery cell according to claim 10, characterized in that: The portion of the adapter between the first connecting portion and the second connecting portion forms a third connecting portion, and the third connecting portion is bent to connect the first connecting portion and the second connecting portion.

12. The battery cell according to claim 10 or 11, characterized in that: The plurality of transfer foils include at least one first transfer foil and at least one second transfer foil, wherein the first transfer foil and the second transfer foil are respectively connected to two sides of the thickness of the free end.

13. The battery cell according to any one of claims 1 to 12, characterized in that: A plurality of battery cell bodies sequentially arranged along the second direction constitute a battery cell group, all of the free ends of the battery cell group extend toward a middle position of the battery cell group in the second direction, and are connected to form a first gathering portion, and the adapter supports the first gathering portion.

14. The battery cell according to claim 13, characterized in that: In the second direction, the midpoint of the battery cell group in the second direction is taken as the midpoint of the middle position, and the size of the middle position is less than or equal to 1 / 2 of the size of one of the battery cell bodies.

15. The battery cell according to claim 13 or 14, characterized in that: The battery cell groups are multiple and are arranged in sequence along the second direction, and the adapter supports all the first folded parts.

16. The battery cell according to claim 15, characterized in that: The adapter includes a main structure and a plurality of branch structures, wherein the main structure is connected to the pole body, each of the branch structures is connected to an end of the main structure away from the pole body, and includes at least one level of branch segments, so that the adapter is constructed into a fractal tree structure, and each last level of the branch segments of the branch structures supports one of the first retracted portions.

17. The battery cell according to claim 16, characterized in that: The adapter includes a first connecting portion, a bending portion and a second connecting portion, the first connecting portion and the second connecting portion are opposite to each other, the bending portion is bent and connected between the first connecting portion and the second connecting portion, and at least a portion of the second connecting portion is configured into the multiple branch structures.

18. The battery cell according to claim 16 or 17, characterized in that: The connection position between the main structure and the branch structure is located in the middle of all the battery cell groups in the second direction.

19. The battery cell according to any one of claims 13 to 18, characterized in that: The number of the battery cell bodies in the battery cell group is an odd number or an even number; and / or, The numbers of the battery cell bodies in the plurality of battery cell groups are equal or different.

20. The battery cell according to any one of claims 1 to 19, characterized in that: Also includes: An insulating component is disposed in the accommodating cavity and is formed with a through hole. The insulating component blocks the battery body from the portion of the tab group and / or the adapter that passes through the through hole to the insulating component away from the battery body.

21. The battery cell according to claim 20, characterized in that: The insulating component comprises: An insulating film completely covers the battery cell body, the insulating film is formed with the through hole at a position opposite to the first shell wall, and the portion of the insulating film surrounding the through hole blocks the portion of the tab group that passes through the through hole to the insulating film on the side facing the pole body and the battery cell body.

22. The battery cell according to claim 20 or 21, characterized in that: The insulating component comprises: An insulating bracket is arranged on the side of the battery body facing the first shell wall, the through hole is formed at a position of the insulating bracket opposite to the pole component, and a portion of the insulating bracket surrounding the through hole is blocked between the adapter and the battery body.

23. The battery cell according to any one of claims 1 to 22, characterized in that: The pole component further includes a transition structure and an insulating structure. The transition structure surrounds the pole body and is connected to the first shell wall. The insulating structure is insulated and fitted between the transition structure and the pole body.

24. The battery cell according to claim 23, characterized in that: The insulating structure comprises a sealing structure, which is arranged around the peripheral side of the transition structure facing the pole body and is at least partially clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall.

25. The battery cell according to claim 24, characterized in that: The pole body includes a peripheral portion, the transition structure is clamped on both sides of the peripheral portion in the inner and outer directions of the first shell wall by the insulating structure, and the sealing structure is clamped between the peripheral portion facing the battery core component and the transition structure.

26. The battery cell according to claim 24, characterized in that: The transition structure includes a mating ring portion, the pole body includes a penetration portion passing through the mating ring portion, and an inner limit portion and an outer limit portion connected to the penetration portion and clamped on both sides of the mating ring portion, and at least a portion of the sealing structure is clamped between the mating ring portion and the inner limit portion.

27. The battery cell according to any one of claims 1 to 26, characterized in that: The pole component forms a receiving groove which is recessed relative to the first shell wall in a direction away from the battery core component and is open in a direction toward the battery core component. At least a portion of the adapter is received in the receiving groove.

28. The battery cell according to any one of claims 1 to 27, characterized in that: The shell component comprises a shell body and a shell cover, wherein the shell body is an integral piece and one end of the shell body is open, and the shell cover is arranged at the open end of the shell body. The end of the shell body opposite to the shell cover is the first shell wall; Alternatively, the shell cover is the first shell wall.

29. The battery cell according to any one of claims 1 to 28, characterized in that: Also includes: The pressure relief component is arranged on the housing component and is located on the same side or on the opposite side as the pole component.

30. A processing method, characterized in that: The processing method is used for processing the battery monomer according to any one of claims 1 to 29, and the processing method comprises: The battery core component is installed into the accommodating cavity, and one end of the battery core component where the tab group is arranged is arranged on the inner side of the first shell wall and opposite to the first shell wall; The pole component is mounted on the first shell wall, and the pole tab group is connected to the pole body through the adapter, and the adapter supports the free end of the pole tab group.

31. The processing method according to claim 30, characterized in that: The first shell wall is formed with a mounting hole; The steps of installing the pole component on the first shell wall, connecting the pole lug group to the pole body through the adapter, and allowing the adapter to support the free end of the pole lug group include: One end of the adapter is connected to the pole lug group, and the other end passes through the mounting hole to the outside of the first shell wall to be connected to the pole body; Covering the pole component connected with the adapter on the mounting hole from the inner side or the outer side of the first shell wall; or, The steps of installing the pole component on the first shell wall, connecting the pole lug group to the pole body through the adapter, and allowing the adapter to support the free end of the pole lug group include: Placing the battery core component on the inner side of the first shell wall, connecting one end of the adapter to the pole lug group, and the other end to the pole body; The pole component connected with the adapter is passed through the mounting hole and then covered on the mounting hole from the inner side or the outer side of the first shell wall.

32. The processing method according to claim 31, characterized in that: The tab group includes a plurality of tab sheets; Before connecting the tab group to the adapter, the method further includes gathering a plurality of tab sheets to form a stacked sheet portion at the free end; The step of connecting one end of the adapter to the tab group comprises: Connecting the plurality of tab sheets of the tab group at the stacked portion to form the first gathered portion, and connecting at least a portion of the first gathered portion to the adapter; or, At least a portion of the laminations are connected to the adapter.

33. The processing method according to claim 31 or 32, characterized in that: The end of the adapter away from the pole body has a clamping structure, and includes two clamping parts arranged opposite to each other; The step of connecting one end of the adapter to the tab group comprises: Clamp the free end with the two clamping parts from both sides of the free end; Both of the clamping parts are connected to the free end.

34. The processing method according to any one of claims 31 to 33, characterized in that: The adapter comprises a plurality of adapter foils; Before connecting one end of the adapter to the tab group, the method further includes: stacking a plurality of the transfer foils; connecting partial regions of the stack to form a first connection portion; The step of connecting one end of the adapter to the tab group and the other end to the pole body comprises: Connecting a stacked partial area of ​​a plurality of the transfer foils to the free end so that the stacked partial area forms a second connection portion spaced apart from the first connection portion; The first connection portion is connected to the pole body.

35. The processing method according to any one of claims 31 to 34, characterized in that: In the step of covering the mounting hole with the pole component connected with the adapter from the inner side or the outer side of the first shell wall, or covering the mounting hole with the pole component connected with the adapter from the inner side or the outer side of the first shell wall after passing through the mounting hole: When the pole component is installed on the first shell wall, the portion of the pole tab group and the adapter that are connected and located between the first shell wall and the battery cell body is bent.

36. The processing method according to claim 35, characterized in that: The battery cell includes an insulating bracket located inside the first shell wall; When the pole component is installed on the first shell wall, the step of making the portion located between the first shell wall and the battery cell body after the pole tab group and the adapter are connected to be bent includes: When the pole component is installed on the first shell wall, the portion of the pole lug group and the adapter that is connected and located between the first shell wall and the battery cell body is bent to form a first open groove, and the free end defines at least a portion of a groove wall on one side of the first open groove close to the pole body; A portion of the insulating support is inserted into the first opening groove.

37. The processing method according to claim 35, characterized in that: The battery cell includes an insulating bracket located inside the first shell wall; When the pole component is installed on the first shell wall, the step of making the portion located between the first shell wall and the battery cell body after the pole tab group and the adapter are connected to be bent includes: When the pole component is installed on the first shell wall, the portion of the pole lug group and the adapter that is connected and located between the first shell wall and the battery cell body is bent to form a first opening groove, and a second opening groove that is adjacent to the first opening groove and located on a side of the first opening groove that faces the pole body, and the opening directions of the second opening groove and the first opening groove are arranged at an angle; Part of the insulating support is inserted into the first opening groove and the second opening groove.

38. The processing method according to any one of claims 35 to 37, characterized in that: The step of connecting the other end of the adapter to the pole body comprises: The angle of the pole component is adjusted so that the normal direction of the inner end surface of the pole body is close to the stacking direction of the plurality of battery cell bodies. The step of placing the pole component connected with the adapter on the mounting hole comprises: The angle of the pole component is adjusted on the outer side of the first shell wall so that the normal of the inner end surface of the pole body is close to perpendicular to the stacking direction of the multiple battery cell bodies, and the pole ear group is bent and deformed to form a first opening groove, and the adapter is bent and deformed to form a second opening groove, and the opening directions of the first opening groove and the second opening groove are arranged at an angle.

39. The processing method according to any one of claims 30 to 38, characterized in that: The housing component comprises a housing body and a housing cover, wherein the housing body has an opening; When the end wall of the shell body opposite to the opening is the first shell wall, the steps of loading the battery core component into the accommodating cavity and arranging one end of the battery core component of the tab group on the inner side of the first shell wall and opposite to the first shell wall include: Installing the battery core component into the accommodating cavity from the opening; The tab group is extended from the mounting hole so that one end of the battery core component where the tab group is arranged is arranged on the inner side of the first shell wall and opposite to the first shell wall; Closing the shell cover on the opening; When the shell cover is the first shell wall, the steps of placing the battery core component into the accommodating cavity and arranging one end of the battery core component where the tab group is arranged on the inner side of the first shell wall and opposite to the first shell wall include: Supporting the battery core component on the inner side of the shell cover; The tab group is extended from the mounting hole so that one end of the battery core component where the tab group is arranged is arranged on the inner side of the first shell wall and opposite to the first shell wall; The shell body is sleeved on the outer side of the battery core component and connected to the shell cover.

40. The processing method according to claim 39, characterized in that: When the end wall of the shell body opposite to the opening is the first shell wall, before the battery core component is loaded into the accommodating cavity from the opening, it also includes wrapping an insulating film on the outside of the battery core body; When the shell cover is the first shell wall, before the shell body is sleeved on the outer side of the battery core component, the method further includes wrapping an insulating film on the outer side of the battery core body.

41. A battery, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 29.

42. The battery according to claim 41, characterized in that The battery comprises a box body, the battery cells are multiple and are accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole component is arranged on the side of the shell component facing the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

43. An electrical device, characterized in that: Comprising a battery according to claim 41 or 42.

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