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

Abstract

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

Description

[0001] This application is a divisional application of the application with the application number 202410706366.4, the application date of May 31, 2024, and the invention name of the assembling method of battery cell, battery cell, battery and electric device. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to an assembling method of battery cell, battery cell, battery and electric device. BACKGROUND

[0003] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. Among them, the power battery includes a plurality of battery cells. However, the reliability of the battery cell needs to be improved, so that the reliability of the power battery also needs to be improved. SUMMARY

[0004] The embodiments of the present application provide an assembling method of battery cell, battery cell, battery and electric device, which can improve the reliability of the battery cell.

[0005] In a first aspect, the embodiments of the present application provide an assembling method of battery cell. The battery cell includes a shell component, a pole component installed on the shell component, and an electrode component received in the shell component and connected with the pole component. The shell component includes a shell body and a shell cover. The shell body has an opening, and the shell cover closes the opening. The shell body or the shell cover includes a first shell wall. The assembling method includes: connecting the electrode component with the pole component; and installing the pole component connected with the electrode component to the first shell wall.

[0006] In the above technical solution, the connection of the pole component and the electrode component is completed first, and then the connection of the pole component and the shell component is completed, instead of first completing the pre-assembly of the pole component and the shell component, and then connecting the electrode component and the pole component. In this way, it is beneficial to shorten the length of the conductive part connecting the pole component and the electrode component, reduce the redundancy of the conductive part in the shell component, reduce the space occupation of the conductive part in the shell component, improve the energy density of the battery cell, and reduce the risk of the conductive part inserting into the active material coating part of the electrode component and causing short circuit, thereby improving the reliability of the battery cell. In addition, this assembling method can realize the assembly of the battery cell whether the pole component is arranged on the shell body or the shell cover, so that the installation position of the pole component on the shell component can be flexibly selected. When the pole component is arranged on the shell body, it is beneficial to reduce the cracking problem at the connection between the shell body and the shell cover, thereby improving the reliability of the battery cell.

[0007] In some embodiments, the first shell wall has a mounting hole, the pole component includes a pole body, an adapter structure and an insulation structure, the electrode component is connected with the pole body, the adapter structure surrounds the pole body and is connected with the first shell wall, and the insulation structure is in insulation fit between the adapter structure and the pole body; the step of connecting the electrode component with the pole component specifically includes connecting the electrode component with the pole body; and the step of mounting the pole component connected with the electrode component to the first shell wall specifically includes disposing the pole component connected with the electrode component at the mounting hole and connecting the adapter structure with the first shell wall.

[0008] In the above technical solution, the pole component has a simple structure and is easy to process, and because it includes 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 designed separately based on different factors to flexibly adapt to the connection requirements of different forms of shell components and electrode components, thereby increasing the application range of the pole component.

[0009] In some embodiments, the electrode component is connected with the pole body through a conductive part; the step of connecting the electrode component with the pole body specifically includes placing the electrode component and the conductive part connected with the electrode component on the inner side of the first shell wall and passing the conductive part out of the mounting hole to the outer side of the first shell wall; and the step of connecting the conductive part passed out of the mounting hole with the pole body of the pole component placed on the outer side of the first shell wall.

[0010] In the above technical solution, because the conductive part is not connected with the pole component when it passes through the mounting hole, the conductive part is facilitated to pass through the mounting hole, thereby improving the operation convenience. Moreover, because the welding position of the pole component and the conductive part is located on the outer side of the first shell wall, the problem that the conductive scrap formed in the welding process enters the inside of the shell body and damages the electrode component can be improved.

[0011] In some embodiments, the step of disposing the pole component connected with the electrode component at the mounting hole and connecting the adapter structure with the first shell wall specifically includes covering the pole component connected with the conductive part at the mounting hole from the outer side of the first shell wall, so that the adapter structure abuts against the outer side of the first shell wall; and connecting the adapter structure with the first shell wall from the outer side of the first shell wall.

[0012] In the above technical solution, because the pole component is covered at the mounting hole from the outer side of the first shell wall, so that the adapter structure abuts against the outer side of the first shell wall, and the adapter structure is connected with the first shell wall from the outer side of the first shell wall, the assembly and connection of the pole component and the first shell wall are facilitated, and the connection reliability of the pole component and the first shell wall is improved.

[0013] In some embodiments, the end of the shell body opposite to the opening is a first shell wall; the step of placing the electrode component and the conductive part connected to the electrode component inside the first shell wall and making the conductive part pass through the mounting hole to the outside of the first shell wall specifically includes: adjusting the relative positions of the shell body, the electrode component and the conductive part, so that the electrode component is located on the side of the conductive part connected to the electrode component away from the shell body, and the opening of the shell body faces the conductive part; and the electrode component and the conductive part are loaded into the shell body.

[0014] In the above technical solution, by arranging the pole part at the end of the shell body opposite to the opening, the cracking problem at the connection between the shell body and the shell cover is improved, and the reliability of the battery monomer is improved.

[0015] In some embodiments, the shell cover is a first shell wall; the step of placing the electrode component and the conductive part connected to the electrode component inside the first shell wall and making the conductive part pass through the mounting hole to the outside of the first shell wall is between the steps of arranging the pole part connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall, and further includes the steps of: sleeving the shell body outside the electrode component; and connecting the shell body and the shell cover.

[0016] In the above technical solution, by connecting the shell body and the shell cover first and then connecting the pole part to the shell cover, the electrode component can be accommodated by the shell body and the shell cover can be supported, which facilitates the positioning and supporting of the shell cover, facilitates the connection of the shell cover and the adapter structure, and improves the connection reliability of the shell cover and the pole part.

[0017] In some embodiments, the inner side of the shell cover has an insulating support, and the step of connecting the electrode component and the pole body further includes: before the step of sleeving the shell body outside the electrode component, placing the electrode component with the conductive part connected thereto facing downward, and placing the shell cover with the insulating support facing upward; wrapping an insulating film outside the electrode component supported on the top of the insulating support, so that the insulating film is connected to the insulating support; and the step of sleeving the shell body outside the electrode component specifically includes: placing the shell body with the opening facing downward, and sleeving the shell body outside the electrode component wrapped with the insulating film from top to bottom.

[0018] In the above technical solution, when the shell body is sleeved outside the electrode component, the shell cover is not connected to the electrode component, and the insulating support is arranged on the inner side of the shell cover to support the electrode component from the bottom of the electrode component, so that the problem of separation of the electrode component and the shell cover is avoided without the need for other limiting clamps, and thus the assembly process can be simplified and the use of limiting clamps and the like can be reduced.

[0019] In some embodiments, the step of arranging the pole part connected with the electrode part at the mounting hole and connecting the adapter structure with the first shell wall specifically comprises: passing the pole part connected with the electrode part out of the first shell wall from the inner side of the first shell wall to the outer side of the first shell wall through the mounting hole; covering the pole part passed out of the first shell wall from the outer side of the first shell wall to the mounting hole, so that the adapter structure abuts against the outer side of the first shell wall; and connecting the adapter structure with the first shell wall from the outer side of the first shell wall.

[0020] In the above technical solution, the pole part is connected with the electrode part first, and then the pole part is passed through the mounting hole, so that when the electrode part and the pole part are connected, the problem of avoiding the first shell wall does not need to be considered, or in other words, when the electrode part and the pole part are connected, the pole part and the electrode part are not located on the two sides of the first shell wall, thereby facilitating 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 monomer. Moreover, since the welding position of the pole part and the electrode part is located outside the shell body, the problem of the conductive debris formed during welding entering the inside of the shell body and damaging the electrode part can be improved. Furthermore, since the pole part is covered from the outer side of the first shell wall to the mounting hole, so that the adapter structure abuts against the outer side of the first shell wall, and the adapter structure and the first shell wall are connected from the outer side of the first shell wall, the assembly and connection of the pole part and the first shell wall are facilitated, and the connection reliability of the pole part and the first shell wall is improved.

[0021] In some embodiments, the mounting hole is a long strip-shaped hole, and the pole part is formed in a long strip-shaped structure matching the shape of the mounting hole; the step of passing the pole part connected with the electrode part out of the first shell wall from the inner side of the first shell wall to the outer side of the first shell wall through the mounting hole specifically comprises: adjusting the placement angle of the pole part, so that the thickness direction of the pole part matches the width direction of the mounting hole, and the length direction of the pole part forms an angle with the length direction of the mounting hole; and passing the pole part out of the first shell wall from the mounting hole according to the placement angle.

[0022] In the technical solution, the angle of the pole post component is adjusted first, and then the pole post component is inserted through the installation hole, so that the pole post component can be smoothly inserted through the installation hole, the assembly efficiency is improved, and the risk of collision and scratching between the pole post component and the shell component is reduced. Moreover, by setting the pole post component as a long strip structure matching the shape of the installation hole, the pole post component can be adjusted to an angle where the thickness direction of the pole post component is close to the width direction of the installation hole, and then the thickness direction of the pole post component is rotated to be close to the thickness direction of the first shell wall after the pole post component is inserted through the installation hole. Thus, the space required for the turning motion of the pole post component is small, the space required for the turning of the pole post component is reduced, the length of the conductive part is shortened, the material is saved, the cost is reduced, the redundancy of the conductive part is reduced, the space occupation of the conductive part to the accommodation cavity is reduced, and the energy density of the battery monomer is improved.

[0023] In some embodiments, the angle between the length direction of the pole post component and the length direction of the installation hole is specifically that the length direction of the pole post component matches the diagonal direction of the installation hole, or the length direction of the pole post component extends from one end of the length direction of the installation hole to the other end of the length direction of the installation hole and is inclined to the length direction of the installation hole.

[0024] In the technical solution, by adjusting the length direction of the pole post component as above, the pole post component can be smoothly inserted through the installation hole, the assembly efficiency is improved, and the risk of collision and scratching between the pole post component and the shell component is reduced.

[0025] In some embodiments, the end of the shell body opposite to the opening is the first shell wall, and the step of inserting the pole post component connected with the electrode component from the inside of the first shell wall to the outside of the first shell wall through the installation hole specifically includes: adjusting the relative positions of the shell body, the electrode component, and the pole post component, so that the electrode component is located on the side of the pole post component away from the shell body, and the opening of the shell body faces the pole post component; and the electrode component and the pole post component are assembled into the shell body.

[0026] In the technical solution, by setting the pole post component at the end of the shell body opposite to the opening, the cracking problem at the connection between the shell body and the shell cover is improved, and the reliability of the battery monomer is improved.

[0027] In some embodiments, the shell cover is the first shell wall, and after the step of inserting the pole post component connected with the electrode component from the inside of the first shell wall to the outside of the first shell wall through the installation hole, the method further includes the steps of: sleeving the shell body outside the electrode component; and connecting the shell body and the shell cover; and the step of connecting the shell body and the shell cover is performed before the step of covering the pole post component inserted to the outside of the first shell wall with the shell cover from the outside of the first shell wall to make the adapter structure abut against the outside of the first shell wall.

[0028] In the technical solution, the connection of the shell body and the shell cover is completed first, and then the connection of the pole part and the shell cover is completed, so that the shell body can support the shell cover, and the shell cover can be conveniently positioned and supported to facilitate the connection of the shell cover and the adapter structure and improve the connection reliability of the shell cover and the pole part.

[0029] In some embodiments, the shell cover is a first shell wall; after the step of passing the pole part connected with the electrode part from the inner side of the first shell wall to the outside of the first shell wall through the mounting hole, the method further comprises the steps of: sleeving the shell body on the electrode part; connecting the shell body and the shell cover; wherein the step of sleeving the shell body on the electrode part is performed after the step of connecting the adapter structure and the first shell wall from the outside of the first shell wall.

[0030] In the technical solution, the connection of the shell body and the shell cover is completed first, and then the connection of the pole part and the shell cover is completed, so that the shell body can support the shell cover, and the shell cover can be conveniently positioned and supported to facilitate the connection of the shell cover and the adapter structure and improve the connection reliability of the shell cover and the pole part.

[0031] In some embodiments, the pole part connected with the electrode part is arranged at the mounting hole, and the step of connecting the adapter structure and the first shell wall comprises: placing the pole part connected with the electrode part and the electrode part on the inner side of the first shell wall; covering the pole part connected with the electrode part on the mounting hole from the inner side of the first shell wall, so that the adapter structure abuts against the inner side of the first shell wall; and connecting the adapter structure and the first shell wall from the outer side of the first shell wall.

[0032] In the technical solution, the pole part is covered on the mounting hole from the inner side of the first shell wall, so that the conductive part and the pole part do not need to pass through the mounting hole, thereby reducing the processing steps and the operation difficulty. Moreover, the adapter structure and the first shell wall are connected from the outer side of the first shell wall, thereby facilitating the assembly and connection of the pole part and the first shell wall, and improving the connection reliability of the pole part and the first shell wall. In addition, the electrode part and the pole part are connected first, and then the electrode part and the pole part are placed on the inner side of the first shell wall, so that the electrode part and the pole part are not located on both sides of the first shell wall when the electrode part and the pole part are connected, thereby 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 monomer. Moreover, the welding position of the pole part and the electrode part is located outside the shell body, so that the problem of damage to the electrode part caused by the conductive scrap formed during the welding process entering the inside of the shell body can be improved.

[0033] In some embodiments, the first shell wall is opposite to the opening of the shell body; the step of arranging the electrode component and the pole component connected with the electrode component on the inner side of the first shell wall specifically comprises: adjusting the relative positions of the shell body, the electrode component and the pole component, so that the electrode component is located on the side of the pole component connected with the electrode component, away from the shell body, and the opening of the shell body faces the pole component; and the electrode component and the pole component are arranged in the shell body.

[0034] In the above technical solution, the pole component is arranged in the shell body, which is beneficial to improve the cracking problem at the connection between the shell body and the shell cover, and improve the reliability of the battery monomer.

[0035] In some embodiments, the first shell wall is opposite to the opening of the shell body; the step of arranging the electrode component and the pole component connected with the electrode component on the inner side of the first shell wall specifically comprises: adjusting the relative positions of the shell body, the electrode component and the pole component, so that the electrode component is located on the side of the pole component connected with the electrode component, away from the shell body, and the opening of the shell body faces the pole component; and the electrode component and the pole component are arranged in the shell body.

[0036] In the above technical solution, the pole component is arranged in the shell body, which is beneficial to improve the cracking problem at the connection between the shell body and the shell cover, and improve the reliability of the battery monomer.

[0037] In some embodiments, the insulating structure comprises a sealing structure, which is annularly arranged on the circumferential side of the adapter structure facing the pole body, and is at least partially clamped between the adapter structure and the pole body in the inner-outer direction of the first shell wall; the step of connecting the electrode component and the pole body further comprises: providing the pole component.

[0038] In the above technical solution, the pole component is arranged in the shell body, which is beneficial to improve the cracking problem at the connection between the shell body and the shell cover, and improve the reliability of the battery monomer.

[0039] In some embodiments, the pole body includes a peripheral portion, the adapter structure is clamped on both sides of the peripheral portion in the inner-outer direction of the first shell wall by the insulating structure, and at least part of the sealing structure is clamped between the side of the peripheral portion facing the electrode component and the adapter structure; the step of providing the pole component specifically includes: assembling or shaping the adapter structure to complete the clamping of the peripheral portion and the adapter structure on the sealing structure.

[0040] In the above technical solution, only the adapter structure needs to be operated without operating the pole body, so that the pole component can be provided, thereby simplifying the operation, making the processing of the pole component easy, and enabling the relative fixing and insulating cooperation of the pole body and the adapter structure to be achieved simply and effectively. Moreover, the sealing structure can be located at the cooperation position of the adapter structure and the pole body, which is conducive to sealing the cooperation position of the adapter structure and the pole body in a shorter path, improving the reliability of the sealing, and is conducive to reducing the size of the sealing structure, reducing the sealing area, easily realizing compression sealing of the sealing structure, preventing the sealing from being invalid, and improving the sealing effect. Furthermore, since at least part of the sealing structure is clamped between the side of the peripheral portion facing the electrode component and the adapter structure, the sealing structure can be sealed from the side of the peripheral portion facing the accommodation cavity, and the leakage of the electrolyte from the cooperation position of the pole body and the adapter structure can be more effectively inhibited, thereby improving the sealing effect.

[0041] In some embodiments, the adapter structure includes a cooperation ring portion, the pole body includes a penetrating portion penetrating the cooperation ring portion, and an inner limiting portion and an outer limiting portion connected with the penetrating portion and clamped on both sides of the cooperation ring portion in the inner-outer direction, and at least part of the sealing structure is clamped between the cooperation ring portion and the inner limiting portion to provide the pole component; the step of providing the pole component specifically includes: assembling or shaping the pole body to complete the clamping of the cooperation ring portion and the pole body on the sealing structure.

[0042] In the above technical solution, only the pole body needs to be operated without operating the adapter structure, so that the pole component can be provided, thereby simplifying the operation, making the processing of the pole component easy, and enabling the relative fixing and insulating cooperation of the pole body and the adapter structure to be achieved simply and effectively. Moreover, the sealing structure is clamped by the cooperation position of the pole body and the cooperation ring portion, so that the sealing structure can be located at the cooperation position of the adapter structure and the pole body, which is conducive to sealing the cooperation position of the adapter structure and the pole body in a shorter path, improving the reliability of the sealing, and is conducive to reducing the size of the sealing structure, reducing the sealing area, easily realizing compression sealing of the sealing structure, preventing the sealing from being invalid, and improving the sealing effect. Furthermore, since at least part of the sealing structure is clamped between the cooperation ring portion and the inner limiting portion, the sealing structure can be sealed from the side of the cooperation ring portion facing the accommodation cavity, and the leakage of the electrolyte from the cooperation position of the pole body and the adapter structure can be more effectively inhibited, thereby improving the sealing effect.

[0043] In some embodiments, the first shell wall has a mounting hole, and a sealing ring is arranged around the mounting hole, and the sealing ring is clamped between the pole post component and the first shell wall; the pole post component connected with the electrode component is arranged at the mounting hole, and the steps of connecting the adapter structure with the first shell wall specifically include: installing the sealing ring at the mounting hole of the first shell wall; covering the pole post component connected with the electrode component at the mounting hole, so that the sealing ring is clamped between the pole post component and the first shell wall.

[0044] In the above technical solution, the pole post component has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall.

[0045] In some embodiments, the adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the contour shape of the pole post body matches the contour shape of the adapter structure; or the adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the pole post body is arranged at the length center position of the adapter structure and is circular; the steps of connecting the electrode component with the pole post body further include: providing the pole post body and the adapter structure; and assembling the pole post component.

[0046] In the above technical solution, when the contour shape of the pole post body is formed in a long strip shape matching the contour shape of the adapter structure, the area of the pole post body is large, which is beneficial to increase the connection area of the conductive part with the pole post body, thereby improving the charging performance. When the pole post body is arranged at the length center position of the long strip-shaped adapter structure and is circular, it is beneficial to reduce the connection area of the pole post body with the adapter structure, improve the stress uniformity at the connection position of the pole post body with the adapter structure, and thereby improve the connection reliability of the pole post body with the adapter structure.

[0047] In some embodiments, the pole post component includes a pole post body, the pole post body includes a first pole post part and a second pole post part, the second pole post part is mounted to the first shell wall, the first pole post part is mounted to the second pole post part, and the electrode component is connected with the first pole post part; the steps of connecting the electrode component with the pole post component specifically include: connecting the electrode component with the first pole post part; and the steps of mounting the pole post component connected with the electrode component to the first shell wall specifically include: assembling and connecting the first pole post part connected with the electrode component to the second pole post part mounted to the first shell wall.

[0048] In the above technical solution, by dividing the pole post body into two parts for assembly and connection, when assembling the battery monomer, the connection of the first pole post part with the electrode component and the connection of the second pole post part with the first shell wall can be performed first, and then the connection of the first pole post part and the second pole post part is performed, thereby facilitating the shortening of the conductive part, the reduction of redundancy of the conductive part, and the reduction of material cost.

[0049] In some embodiments, the second pole piece defines a fitting hole, and the first pole piece cover is arranged on a side of the second pole piece away from the electrode component and covers the fitting hole; the step of assembling the first pole piece connected with the electrode component to the second pole piece mounted on the first shell wall specifically includes: arranging the first pole piece connected with the electrode component on the fitting hole from the outside of the second pole piece; and connecting the first pole piece from the second pole piece from the outside of the first shell wall.

[0050] In the above technical solution, by arranging the fitting hole, the first pole piece and the second pole piece can be connected from the outside of the pole component, which is beneficial to improve the connection convenience and reliability of the first pole piece and the second pole piece.

[0051] In some embodiments, the step of connecting the electrode component with the first pole piece specifically includes: arranging the electrode component and the conductive part on the inside of the first shell wall, and arranging the conductive part to pass out to the outside of the second pole piece from the fitting hole; and connecting the conductive part passing out to the outside of the first shell wall with the first pole piece arranged on the outside of the first shell wall.

[0052] In the above technical solution, since the conductive part is not connected with the first pole piece when passing through the fitting hole, the conductive part is facilitated to pass through the fitting hole, and the operation convenience is improved. Moreover, since the welding position of the first pole piece and the conductive part is located on the outside of the shell body, the problem that the conductive scrap formed in the welding process enters the inside of the shell body to damage the electrode component can be improved.

[0053] In some embodiments, the step of arranging the first pole piece connected with the electrode component on the fitting hole from the outside of the second pole piece further includes: arranging the electrode component and the first pole piece connected with the electrode component on the inside of the first shell wall; and arranging the first pole piece to pass out to the outside of the second pole piece from the fitting hole.

[0054] In the above technical solution, since the electrode component and the first pole piece are connected first, and then the first pole piece passes through the fitting hole, when the electrode component and the first pole piece are connected, the problem of avoiding the first shell wall does not need to be considered, or when the electrode component and the first pole piece are connected, the second pole piece and the electrode component are not located on the two sides of the first shell wall, which is beneficial to further shorten the length of the conductive part, reduce the redundancy of the conductive part after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery monomer. Moreover, since the welding position of the electrode component and the first pole piece is located on the outside of the shell body, the problem that the conductive scrap formed in the welding process enters the inside of the shell body to damage the electrode component can be improved.

[0055] In some embodiments, the tab part of the electrode component includes a gathered part formed by stacking and connecting multiple tab sheets, and the tab part is connected to the pole part through the gathered part; and the step of connecting the electrode component to the pole part further includes: stacking and connecting the multiple tab sheets in the tab part of the electrode component to form the gathered part.

[0056] In the above technical solution, by connecting the multiple tab sheets in the tab part to form the gathered part, the gathered part can present a sheet shape formed by connecting the multiple tab sheets together and having a certain rigidity, rather than a loose and scattered foil shape, thereby on the one hand facilitating the punching operation of the tab part, such as facilitating the operation of punching or fitting a hole, improving the processing efficiency, and on the other hand making the welding of the gathered part to the pole part more reliable, and a pore is not easy to form in the weld, which can improve the connection reliability and the conductivity of the welding part, and make the conductivity of the electrode component to the pole part more stable and reliable.

[0057] In some embodiments, the electrode component includes multiple electrode assemblies; and the step of connecting the multiple tab sheets in the tab part of the electrode component to form the gathered part specifically includes: stacking the multiple electrode assemblies in the thickness direction of the electrode assemblies; and stacking and connecting the multiple tab sheets of at least two electrode assemblies to form the gathered part.

[0058] In the above technical solution, on the one hand, the total number of the gathered parts can be reduced, and the connection step of the gathered parts to the pole body can be reduced, thereby improving the processing efficiency, and on the other hand, the problem of cracking at the connection position of the tab part to the active material coating part caused by the different movements of the tab sheets of different electrode assemblies out of synchronization when the gathered part is manufactured first and then the electrode assemblies are stacked can be avoided.

[0059] In some embodiments, the tab part of the electrode component includes a gathered part formed by stacking and connecting multiple tab sheets, and the pole part includes a pole body, and the surface of the end of the pole body facing the electrode component is an inner end surface of the pole body; and the step of connecting the electrode component to the pole part specifically includes: laying the gathered part on the inner end surface of the pole body; and connecting the gathered part to the inner end surface of the pole body.

[0060] In the above technical solution, by laying the gathered part on the inner end surface of the pole body, the gathered part is in a flat state, and at least part of the gathered part falls on the inner end surface of the pole body, thereby avoiding damage to the tab part caused by bending the gathered part, improving the charging performance, and facilitating the arrangement of a welding nozzle, thereby improving the connection reliability of the gathered part to the pole body.

[0061] In some embodiments, the shell component has a receiving cavity therein, the pole post component surrounds a receiving slot that is recessed in a direction away from the electrode component relative to the first shell wall and is open in a direction toward the electrode component; the step of laying the folding portion on the inner end surface of the pole post body further comprises: loading the folding portion into the receiving slot.

[0062] In the above technical solution, the receiving slot is arranged to receive the folding portion, so as to reduce the space occupied by the tab portion in the receiving cavity, so that the receiving cavity has a larger space to accommodate the active material coating portion, which is beneficial to increase the volume of the active material coating portion, thereby increasing the energy density of the battery monomer.

[0063] In some embodiments, the electrode component comprises a plurality of electrode assemblies arranged in a stack; the step of laying the folding portion on the inner end surface of the pole post body further comprises: arranging the pole post component on one side of the electrode component protruding the tab portion; adjusting the angle of the pole post component so that the normal direction of the inner end surface of the pole post body approaches the stacking direction of the plurality of electrode assemblies.

[0064] In the above technical solution, the position and angle of the pole post component are first adjusted so that the normal direction of the inner end surface of the pole post body approaches the stacking direction of the plurality of electrode assemblies, and then the folding portion is laid on the inner end surface of the pole post body. Thereafter, the angle of the pole post body does not need to be adjusted again, so that there is enough space near the matching position of the folding portion and the inner end surface of the pole post body for welding operation of the folding portion and the pole post body, thereby simplifying the operation.

[0065] In some embodiments, the pole post component comprises a pole post body, the electrode component is connected to the pole post body through a conductive portion, the conductive portion comprises a tab portion composed of tab pieces of the electrode component, and a conductive piece connected to the tab portion, and the tab portion is connected to the pole post body through the conductive piece; the step of connecting the electrode component and the pole post component comprises: connecting the tab portion and the conductive piece.

[0066] In the above technical solution, the tab portion is connected to the pole post body through the conductive piece, which can shorten the length of the tab portion, improve the problems such as wrinkling, bending and breaking of the tab pieces, and can reduce the connection difficulty and improve the connection convenience of the conductive piece and the pole post body by flexibly designing the shape and material of the conductive piece.

[0067] In some embodiments, the electrode component comprises a plurality of electrode assemblies; the step of connecting the tab portion and the conductive piece further comprises: stacking the plurality of electrode assemblies in the thickness direction of the electrode assemblies; and laminating and gathering the plurality of tab pieces of the at least two electrode assemblies to form a laminated portion.

[0068] In the above technical solution, before connecting the tab part and the conductive part, the stacking of the plurality of electrode assemblies is performed first, and the tab pieces of the same polarity of the plurality of electrode assemblies are gathered together to form a tab part. Compared with the technical solution of separately gathering the tab pieces of each electrode assembly to form a tab part, separately connecting the tab parts of each electrode assembly to the conductive part, and then stacking the plurality of electrode assemblies, on the one hand, the total number of the tab parts and the conductive part can be reduced, the connection steps of the tab parts and the conductive part can be reduced, and the processing efficiency can be improved. On the other hand, when the tab parts are connected to the conductive part first and then the electrode assemblies are stacked, the tab pieces of different electrode assemblies do not move synchronously, which causes tensile stress between the tab pieces, and causes cracking at the connection position of the tab part and the active material coating part.

[0069] In some embodiments, the tab part of the electrode component includes a tab part formed by stacking and gathering a plurality of tab pieces; and before the step of connecting the tab part to the conductive part, the method further includes connecting the plurality of tab pieces in the tab part to form a gathered part.

[0070] In the above technical solution, by pre-connecting the plurality of tab pieces in the tab part to form a gathered part, the gathered part can have a plate shape with a certain rigidity, instead of a loose and scattered foil shape, thereby facilitating the connection of the tab part and the conductive part, and making the welding of the tab part and the conductive part more reliable, and pores are not easily formed in the weld, which can improve the connection reliability and conductivity of the welding part, and make the conductivity of the electrode component and the pole part more stable and reliable.

[0071] In some embodiments, the conductive part includes a first connecting section, and the step of connecting the tab part to the conductive part specifically includes: stacking the gathered part on one side of the first connecting section in the thickness direction of the first connecting section; and connecting the gathered part to the first connecting section.

[0072] In the above technical solution, by setting the first connecting section and the gathered part to have the same thickness, and stacking and connecting the first connecting section and the gathered part in the thickness direction of the first connecting section, the matching mode of the gathered part and the conductive part is simple, which is conducive to improving the production efficiency.

[0073] In some embodiments, the conductive part includes a first connecting section, and the first connecting section includes two clamping parts; and the step of connecting the tab part to the conductive part specifically includes: clamping the tab end part of the tab part between the two clamping parts; and connecting the tab end part of the tab part and the two clamping parts into one body.

[0074] In the technical solution, the two clamping portions can be used to limit the tab portion, thereby improving the connection reliability of the plurality of tab pieces in the tab portion. In some examples, the tab portion clamped between the two clamping portions can be in the state of the laminated portion, that is, the step of connecting the plurality of tab pieces in the laminated portion to form the folded portion can be omitted, thereby simplifying the processing procedure and improving the processing efficiency. Of course, the plurality of tab pieces in the laminated portion can be connected to form the folded portion first, and then the folded portion can be clamped between the two clamping portions and connected to the clamping portions, so that the porosity at the connection between the conductive member and the tab portion can be reduced, and the overcurrent capacity and the connection reliability can be improved.

[0075] In some examples, the step of connecting the electrode component and the tab component further includes adjusting the angle of the tab component so that the inner end surface of the tab body faces the electrode component, and the first connecting segment of the conductive member is supported on the side of the tab portion away from the tab body.

[0076] In the technical solution, the support of the tab portion by the first connecting segment of the conductive member can improve the redundancy of the tab portion and reduce the risk of short circuit caused by the reverse insertion of the active material coating portion. Moreover, the bent conductive member can serve as a buffer support to reduce the risk of the electrode component hitting the first shell wall and improve the reliability of the battery monomer.

[0077] In some examples, the step of connecting the electrode component and the tab component further includes connecting the conductive member and the tab body.

[0078] In the technical solution, the conductive member and the tab body are designed and processed flexibly by being connected as separate parts, thereby improving the diversity of the battery monomer.

[0079] In some examples, the tab component includes a tab body, and the surface of the end of the tab body facing the electrode component is an inner end surface of the tab body. The conductive member includes a second connecting segment. The step of connecting the conductive member and the tab body includes laying the second connecting segment on the inner end surface of the tab body and connecting the second connecting segment to the inner end surface of the tab body.

[0080] In the technical solution, the second connecting segment of the conductive member is laid on the inner end surface of the tab body, so that at least part of the second connecting segment falls on the inner end surface of the tab body and is connected to the inner end surface of the tab body, thereby facilitating the increase of the connection area between the second connecting segment of the conductive member and the tab body and improving the charging performance. Moreover, the welding of the pressure nozzle is facilitated, and the connection reliability between the second connecting segment of the conductive member and the tab body is improved.

[0081] In some embodiments, the pole post component surrounds a receiving groove recessed in a direction away from the electrode component and open in a direction towards the electrode component; the step of laying the second connecting segment on the inner end surface of the pole post body further comprises: loading the second connecting segment into the receiving groove.

[0082] In the above technical solution, the receiving groove is arranged to accommodate the second connecting segment, so as to reduce the space occupied by the conductive part in the receiving cavity, so that the receiving cavity has a larger space to accommodate the active material coating part, which is beneficial to increase the volume of the active material coating part, thereby increasing the energy density of the battery cell. Moreover, since the receiving groove is open in the direction towards the electrode component, the second connecting segment can easily extend into the receiving groove, reducing the operation difficulty.

[0083] In some embodiments, the electrode component comprises a plurality of electrode assemblies arranged in a stack; the step of laying the second connecting segment on the inner end surface of the pole post body further comprises: arranging the pole post component on one side of the electrode component extending from the tab; and adjusting the angle of the pole post component so that the normal of the inner end surface of the pole post body approaches the stacking direction of the plurality of electrode assemblies.

[0084] In the above technical solution, the position and angle of the pole post component are first adjusted so that the normal of the inner end surface of the pole post body approaches the stacking direction of the plurality of electrode assemblies, and then the second connecting segment of the conductive part is laid on the inner end surface of the pole post body. Thereafter, without further adjusting the angle of the pole post body, there is sufficient space near the matching position of the second connecting segment and the inner end surface of the pole post body for welding operation of the second connecting segment and the pole post body, thereby simplifying the operation.

[0085] In some embodiments, the electrode component is connected to the pole post body through a conductive part, the conductive part comprises a tab part composed of a tab sheet of the electrode component, and a conductive part connected to the tab part, the position of the inner end surface of the adapter structure adjacent to the pole post body is a surrounding area surrounding the pole post body, and the inner end surface of the pole post body protrudes in a direction towards the electrode component from the surrounding area; the conductive part comprises a first conductive segment laid on the inner end surface of the pole post body, and a second conductive segment staggered with the inner end surface of the pole post body, the second conductive segment protrudes in a direction away from the electrode component relative to the first conductive segment; the step of connecting the electrode component and the pole post component further comprises: shaping the conductive part so as to comprise the first conductive segment and the second conductive segment; and connecting the tab part to the second conductive segment.

[0086] In the above technical solution, the arrangement of the conductive part can make full use of the space and meet the connection requirements of the pole post body and the conductive part, so that the design of the battery cell is more diverse and flexible.

[0087] In some embodiments, the electrode component is connected with the pole body through the conductive part, the conductive part includes a tab part composed of the tab sheet of the electrode component, and a conductive piece connected with the tab part, the position of the inner end surface of the adapter structure adjacent to the pole body is a surrounding area surrounding the pole body, the surrounding area protrudes from the inner end surface of the pole body in the direction of the electrode component, the inner end surface of the pole body includes a fitting area opposite to the ring hole of the surrounding area; the conductive piece includes a first conductive segment laid on the fitting area, the conductive piece includes a third conductive segment staggered with the fitting area, the third conductive segment protrudes in the direction of the electrode component relative to the first conductive segment, and the tab part is connected with the third conductive segment; the step of connecting the electrode component with the pole component further includes: shaping the conductive piece so that the conductive piece includes the first conductive segment and the third conductive segment; and connecting the tab part to the third conductive segment.

[0088] In the above technical solution, the conductive piece can make full use of space and meet the connection requirements with the pole body and the conductive part, so that the design of the battery monomer is more diverse and flexible.

[0089] In some embodiments, the electrode component includes an active material coating part, the active material coating part is connected with the pole component through the conductive part, the conductive part is bent to form at least two open grooves, the openings of the two adjacent open grooves face different directions and are adjacent in the direction from the pole component to the active material coating part; the step of installing the pole component connected with the electrode component to the first shell wall specifically includes: shaping the conductive part to bend to form at least two open grooves.

[0090] In the above technical solution, the conductive part can present a reciprocatingly bent serpentine shape, the conductive part can play a buffering role, and when the battery monomer is used in a vibrating environment, the active material coating part can be reduced to impact the first shell wall, thereby playing a role in protecting the electrode component and improving the reliability of the battery monomer. Moreover, since the conductive part is not irregularly extended, the mutual interference and scratching between the tab sheets in the conductive part and the risk of the tab sheets being inserted into the active material coating part in the opposite direction can be improved, thereby further improving the reliability of the battery monomer.

[0091] In some embodiments, the step of shaping the conductive part to bend to form at least two open grooves specifically includes: shaping the conductive part to bend to form two open grooves with openings facing opposite directions.

[0092] In the above technical solution, the step can be simplified, the conductive part can present a reciprocatingly bent shape, thereby the length of the conductive part can be shortened, the structure of the conductive part can be simplified, and the processing of the conductive part is facilitated.

[0093] In some embodiments, the battery cell includes a shaping bracket disposed on the side of the electrode component near the terminal post component. The shaping bracket has a perforation. In a state where the conductive part passes through the perforation, the active material coating part connected to the conductive part is located inside the shaping bracket, and the terminal post component connected to the conductive part is located outside the first shell wall, the step of shaping the conductive part to bend the conductive part to form two opening grooves with opposite opening directions specifically includes: with the action of covering the terminal post component in the direction of the first shell wall, the conductive part forms two opening grooves with opposite opening directions on the inside and outside of the shaping bracket.

[0094] In the above technical solution, by setting a shaping bracket, it is easy to bend the conductive part into two opening grooves with opposite opening directions, thus reducing the processing difficulty.

[0095] Secondly, embodiments of this application also provide a battery cell manufactured using the above-described assembly method.

[0096] In the above technical solution, since the battery cell according to the embodiment of this application is processed by the above assembly method, the reliability of the battery cell is improved.

[0097] In some embodiments, the shell body is a semi-closed cylindrical shape with an opening at one end, and the end of the shell body opposite to the opening serves as the first shell wall; or, the shell cover is a flat plate shape and serves as the first shell wall.

[0098] In the above technical solutions, the shell components have various shapes and can adapt to a variety of application scenarios.

[0099] In some embodiments, the battery cell further includes a pressure relief device located on the housing component and on the same side or opposite side as the terminal component.

[0100] In the above technical solutions, when the pressure relief device and the terminal post are located on the same side, the design of other shell walls besides the first shell wall can be simplified, thus simplifying the structure and processing of the battery cell. When the pressure relief device and the terminal post are located on opposite sides, there is no need to consider the space occupied by the pressure relief device in the first shell wall, thereby reducing the volume of the terminal post. This allows for flexible design of the shape and volume of the terminal post as needed.

[0101] Thirdly, embodiments of this application also provide a battery, including a battery cell of any of the above-described solutions.

[0102] In the above technical solution, the reliability of the battery cell according to the embodiment of this application is improved, which is beneficial to improving the performance of the battery.

[0103] In some embodiments, the battery comprises a box body, the battery cells are multiple and are accommodated in the box body, a bottom of the box body is a box bottom plate, and the pole part is arranged on a side of the shell part facing the box bottom plate or a side of the shell part away from the box bottom plate.

[0104] In the above technical solution, when the pole part of the battery cell is arranged on the side of the shell part facing the box bottom plate, the battery cell is in an inverted state, and the product of pressure relief is sprayed in a direction away from the passenger cabin, which is safer; when the pole part of the battery cell is arranged on the side of the shell part close to the box bottom plate, the battery cell is in a normal state, and the electrolyte is not easy to leak; thus, flexible arrangement of the battery cell and the box body can be realized.

[0105] In the fourth aspect, the embodiments of the present application further provide a power utilization device comprising the battery of any of the above-mentioned solutions.

[0106] In the above technical solution, the performance of the battery is improved, and thus the working power utilization performance of the power utilization device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0107] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and thus should not be considered as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0108] Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application; Figure 2 An exploded view of a battery is provided for some embodiments of the present application; Figure 3 A structural schematic diagram of a battery cell is provided for some embodiments of the present application; Figure 4 An exploded view of a part of a battery cell is provided for some embodiments of the present application; Figure 5 A sectional view of a battery cell is provided for some embodiments of the present application; Figure 6 A partial enlarged view of Figure 5 ; Figure 7 An exploded view of a battery cell is provided for some embodiments of the present application; Figure 8 A sectional view of a battery cell is provided for some embodiments of the present application; Figure 9 A step flowchart of an assembling method of a battery cell is provided for some embodiments of the present application; Figures 10A-10D Assembly process diagram of a battery cell according to an embodiment of the application; Figures 11A-11D Assembly process diagram of a battery cell according to an embodiment of the application; Figures 12A-12E Assembly process diagram of a battery cell according to an embodiment of the application; Figures 13A-13E Assembly process diagram of a battery cell according to an embodiment of the application; Figure 14 Assembly process diagram of a battery cell according to an embodiment of the application; Figure 15 Assembly process diagram of a battery cell according to an embodiment of the application; Figure 16 Assembly process diagram of a battery cell according to an embodiment of the application; Figure 17 Assembly process diagram of a battery cell according to an embodiment of the application; Figures 18A-18G Assembly process diagram of a battery cell according to an embodiment of the application; Figure 19 Assembly process diagram of a battery cell according to an embodiment of the application; Figure 20 Assembly process diagram of a battery cell according to an embodiment of the application; Figure 21 Assembly process diagram of a battery cell according to an embodiment of the application; Figure 22 Assembly process diagram of a battery cell according to an embodiment of the application; Figures 23A-23D Assembly process diagram of a battery cell according to an embodiment of the application; Figures 24A-24D Assembly process diagram of a battery cell according to an embodiment of the application; Figure 25 Assembly process diagram of a battery cell according to an embodiment of the application; Figure 26 Assembly process diagram of a battery cell according to an embodiment of the application; Figure 27 Assembly process diagram of a battery cell according to an embodiment of the application; Figure 28 Assembly process diagram of a battery cell according to an embodiment of the application; Figure 29 Step flow chart of the assembly method of the battery cell provided for some embodiments of the present application; Figures 30A-30D Assembly process exploded view of the battery cell provided for an embodiment of the present application; Figures 31A-31D Assembly process exploded view of the battery cell provided for an embodiment of the present application; Figure 32 Step flow chart of the assembly method of the battery cell provided for some embodiments of the present application; Figure 33 Step flow chart of the assembly method of the battery cell provided for some embodiments of the present application; Figures 34A-34D Assembly process exploded view of the battery cell provided for an embodiment of the present application; Figure 35 Step flow chart of the assembly method of the battery cell provided for some embodiments of the present application; Figures 36A-36D Assembly process exploded view of the battery cell provided for an embodiment of the present application; Figure 37 Step flow chart of the assembly method of the battery cell provided for some embodiments of the present application; Figure 38 Step flow chart of the assembly method of the battery cell provided for some embodiments of the present application; Figure 39 Top view of the battery cell provided for some embodiments of the present application; Figure 40 View along the line A-A in Figure 39 ; Figure 41 Schematic view of the pole post component provided for some embodiments of the present application; Figure 42 Top view of the pole post component shown in Figure 41 ; Figure 43 View along the direction B shown in Figure 42 ; Figure 44 Sectional view along the line C-C in Figure 42 ; Figure 45 Step flow chart of the assembly method of the battery cell provided for some embodiments of the present application; Figure 46 Step flow chart of the assembly method of the battery cell provided for some embodiments of the present application; Figure 47 Partial sectional view of the battery cell provided for some embodiments of the present application; Figure 48 Partial cross-sectional view of a battery cell provided for some embodiments of the present application; Figure 49 Partial cross-sectional view of a battery cell provided for some embodiments of the present application; Figure 50 Expedited process of a third adapter ring provided for some embodiments of the present application; Figure 51 Expedited process of a pole post component provided for some embodiments of the present application; Figure 52 Step flow diagram of a method of assembling a battery cell provided for some embodiments of the present application; Figure 53 Partial cross-sectional view of a battery cell provided for some embodiments of the present application; Figure 54 Partial cross-sectional view of a battery cell provided for some embodiments of the present application; Figure 55 Partial cross-sectional view of a battery cell provided for some embodiments of the present application; Figure 56 Step flow diagram of a method of assembling a battery cell provided for some embodiments of the present application; Figure 57 Partial cross-sectional view of a battery cell provided for some embodiments of the present application; Figure 58 Step flow diagram of a method of assembling a battery cell provided for some embodiments of the present application; Figure 59 Step flow diagram of a method of assembling a battery cell provided for some embodiments of the present application; Figures 60A-60D Assembly process exploded view of a battery cell provided for one embodiment of the present application; Figure 61 Step flow diagram of a method of assembling a battery cell provided for some embodiments of the present application; Figure 62 Step flow diagram of a method of assembling a battery cell provided for some embodiments of the present application; Figure 63 Step flow diagram of a method of assembling a battery cell provided for some embodiments of the present application; Figures 64A-64D Assembly process exploded view of a battery cell provided for one embodiment of the present application; Figure 65 Step flow diagram of a method of assembling a battery cell provided for some embodiments of the present application; Figures 66A-66C Expedited process of an electrode component provided for one embodiment of the present application; Figure 67A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 68 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 69 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 70 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 71 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 72 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 73 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 74 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 75 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 76 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 77 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 78 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 79 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 80 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 81 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 82 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 83 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 84 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 85 A step flow chart of the assembling method of the battery cell provided for some embodiments of the present application; Figure 86 A flowchart of steps of a method of assembling a battery cell is provided for some embodiments of the present application.

[0109] Reference signs: Vehicle 1000; Battery 100; Controller 200; Motor 300; Box 101; First box part 1011; Second box part 1012; Battery cell 102; First direction F1; Second direction F2; Third direction F3; Fifth direction F4; Fifth direction F5; Housing part 1; Housing body 11; First housing wall 111; First sink 1111; Lapping part 1112; Mounting hole 112; Opening 113; Second housing wall 114; Housing cover 12; Insulating support 121; Receiving cavity 13; Sealing ring 14; Pole part 2; Pole body 21; Inner end face 211; Through part 214; Riveting part 2141; Inner limiting part 215; Outer limiting part 216; First pole part 21a; Second pole part 21b; Cooperating hole 21b1; Adapter structure 22; Inner ring 2211 of adapter structure; Outer ring 2212 of adapter structure; Inner end face 220 of adapter structure; Surrounding area 2201; Flange part 22a; Second sink 22b; First adapter ring 221; Second adapter ring 222; Stop ring part 2221; First insulating support 224; Third adapter ring 223; Inner extension 2231; Outer extension 2232; Second insulating support 225; Fourth adapter ring 227; Cooperating ring part 2271; Third insulating support 228; Insulating structure 23; Sealing structure part 231; Shaft side part 231a; First insulating part 232; Second insulating part 234; Insulating sealing part 24; Electrode part 3; Electrode assembly 31; Tab 311; Lamella part 312; Furling part 313; Active material coating part 32; tab portion 33; tab end portion 331; conductive portion 4; conductive piece 41; opening groove 42; first opening groove 421; second opening groove 422; first connecting section 411; clamping portion 4110; second connecting section 412; first conductive section 415; second conductive section 416; third conductive section 417; accommodation groove 5; pressure relief device 6; insulating film 7; binding piece 8; shaping support 9; perforation 91. DETAILED DESCRIPTION

[0110] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0111] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by one of ordinary skill in the art to which this application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0112] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0113] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0114] The term "and / or", as used herein, merely describes association between associated objects, and can exist in three forms: for example, A and / or B can mean: A alone, A and B together, or B alone. In addition, the character " / " as used herein generally represents an "or" relationship between the front and rear associated objects.

[0115] In the embodiments of the present application, the same reference signs 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, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0116] "Multiple" appearing in the present application refers to two or more, including two.

[0117] In the present application, the battery cell can include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, or a solid-state battery, etc. The embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a cuboid, or other shapes, etc. The embodiments of the present application are also not limited thereto.

[0118] The battery referred to 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. Exemplarily, the battery can include a box for packaging one or more battery cells, or one or more battery modules, which can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cell.

[0119] The battery cell includes a housing component, an electrode component, and an electrolyte (in a solid-state battery, it can be a solid-state electrolyte layer located between the positive and negative electrode sheets), the electrode component includes at least one electrode assembly, the electrode assembly and the electrolyte are both accommodated in the housing component, the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator film (which can be omitted in a solid-state battery). The battery cell mainly works by moving metal ions between the positive and negative electrode sheets.

[0120] The positive electrode sheet includes a positive current collector and a positive active material layer, the positive active material layer is coated on the surface of the positive current collector, the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer, and the positive current collector without the positive active material layer serves as a positive tab sheet. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc.

[0121] The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. The material of the separator film can be PP, polypropylene or PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of the application is a winding or stacking structure.

[0122] In some battery cells in the related art, the shell includes a shell body and a shell cover, the shell cover is pre-installed with a pole, and when assembling the battery cell, the electrode assembly and the shell cover pre-installed with the pole are respectively laid flat, the electrode assembly is placed on one side in the width direction of the shell cover, then the tab of the electrode assembly is overlapped on the pole pre-installed on the shell cover, and the tab and the pole are welded, then the electrode assembly is turned over to one side in the thickness direction of the shell cover, and then the shell body is sleeved outside the electrode assembly, and the shell body and the shell cover are welded and connected.

[0123] In the above assembly process, the electrode assembly needs to be turned over from one side in the width direction of the shell cover to one side in the thickness direction of the shell cover, so that the length of the tab needs to be relatively long (for example, at least greater than half of the width of the shell cover) to meet the turning over requirement of the electrode assembly. However, due to the relatively long length of the tab, after the assembly is completed, the tab will have a lot of redundancy in the shell, on the one hand, the tab will occupy a lot of space in the shell, affecting the energy density of the battery cell, on the other hand, there is a risk of the tab being inserted into the electrode assembly in reverse, causing a short circuit, affecting the reliability of the battery cell. Moreover, this assembly method is only suitable for the scheme that the pole is pre-installed on the shell cover, if the pole is pre-installed on the shell body, the installation cannot be realized, specifically, if the pole is pre-installed on the shell body, after the electrode assembly is assembled into the shell body, the shell body no longer has space to insert the welding tool, and the welding of the tab and the pole pre-installed on the shell body cannot be performed from the inside of the shell body, and if the welding tool is placed on the outside of the shell body, since the pole has a certain thickness and completely blocks the outside of the tab, the pole and the tab cannot be reliably welded together from the outside of the pole.

[0124] Therefore, the embodiment of the present application proposes a battery cell assembling method, which first completes the connection between the pole post component and the electrode component, and then completes the connection between the pole post component and the shell component, instead of first completing the pre-assembly of the pole post component and the shell component, and then connecting the electrode component and the pole post component. In this way, the length of the conductive part connecting the pole post component and the electrode component can be shortened, the redundancy of the conductive part in the shell component can be reduced, the space occupation of the conductive part in the shell component can be reduced, the energy density of the battery cell can be improved, and the risk of the conductive part being inserted into the active material coating of the electrode component and causing short circuit can be reduced, thereby improving the reliability of the battery cell. In addition, this kind of assembling method can realize the assembly of the battery cell whether the pole post component is arranged on the shell body or the shell cover, so that the installation position of the pole post component on the shell component can be flexibly selected. When the pole post component is arranged on the shell body, the cracking problem of the connection between the shell body and the shell cover can be reduced, and the reliability of the battery cell can be improved.

[0125] The technical solutions described in the embodiments of the present application are suitable for battery cells, batteries containing battery cells, and electric devices using batteries.

[0126] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling 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 electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above electric devices.

[0127] The following embodiments take the electric device as a vehicle for example for convenient description.

[0128] Please refer to Figure 1 , Figure 1 The structural schematic diagram of the vehicle 1000 provided by some embodiments of the present application is shown in FIG. 1. The vehicle 1000 is provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000, etc. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as the operating power supply of the vehicle 1000.

[0129] The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to supply power to the motor 300, for example, for power requirements of the vehicle 1000 during start-up, navigation and travel.

[0130] In some embodiments of the present application, the battery 100 can not only serve as a power source for the operation of the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0131] Please refer to Figure 2 , Figure 2 The battery 100 provided in some embodiments of the present application includes a battery cell 102 and a box 101 for accommodating the battery cell 102. The box 101 can be of various structural forms.

[0132] In some embodiments, the box 101 can include a first box portion 1011 and a second box portion 1012, the first box portion 1011 and the second box portion 1012 being coverable with respect to each other, and the first box portion 1011 and the second box portion 1012 together defining an accommodation space for accommodating the battery cell 102. The connection position of the first box portion 1011 and the second box portion 1012 can also be provided with a sealing member to achieve sealed connection of the first box portion 1011 and the second box portion 1012. For example, referring to Figure 2 , the first box portion 1011 and the second box portion 1012 can each be a hollow structure with one open side, the open side of the first box portion 1011 being coverable with the open side of the second box portion 1012, thereby forming the box 101 with the accommodation space. For another example, the second box portion 1012 can be a hollow structure with one open side, and the first box portion 1011 can be a cover body coverable with the open side of the second box portion 1012. The box 101 can be of various shapes, such as a cylindrical box, a cuboid box, etc.

[0133] In the battery 100, the battery cell 102 can be one or multiple. If the battery cell 102 is multiple, the multiple battery cells 102 can be connected in series, in parallel or in a mixed manner, the mixed manner referring to that the multiple battery cells 102 are connected in both series and parallel. The multiple battery cells 102 can be directly connected in series, in parallel or in a mixed manner, and the whole of the multiple battery cells 102 can be accommodated in the box 101; of course, the multiple battery cells 102 can first be connected in series, in parallel or in a mixed manner to form a battery module, and the multiple battery modules can be connected in series, in parallel or in a mixed manner to form a whole, which can be accommodated in the box 101. In some embodiments, the multiple battery cells 102 can be electrically connected through a busbar component to achieve parallel, series or mixed connection of the multiple battery cells 102.

[0134] Please refer to Figure 3 , Figure 3 A structural schematic diagram of a battery cell 102 is provided for some embodiments of the present application. The battery cell 102 is in the form of a cuboid, the height direction of the battery cell 102 is a first direction F1, the thickness direction of the battery cell 102 is a second direction F2, and the width direction of the battery cell 102 is a third direction F3, and the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other.

[0135] Please refer to Figures 4-8 , Figure 4 An exploded view of a partial structure of a battery cell is provided for some embodiments of the present application. Figure 5 A cross-sectional view of a battery cell is provided for some embodiments of the present application. Figure 6 A partial enlarged view of Figure 5 A structural schematic diagram of a battery cell is provided for some embodiments of the present application. Figure 7 An exploded view of a battery cell is provided for some embodiments of the present application. Figure 8 A cross-sectional view of a battery cell is provided for some embodiments of the present application.

[0136] In combination with Figures 4-6 , the battery cell 102 can include a housing component 1, a pole component 2 and an electrode component 3.

[0137] In combination with Figures 4-6 , the pole component 2 is mounted to the housing component 1. Illustratively, the housing component 1 has a receiving cavity 13 therein, the housing component 1 includes a first shell wall 111 which participates in enclosing the receiving cavity 13, the first shell wall 111 has a mounting hole 112 thereon, the pole component 2 is mounted to the first shell wall 111 and is arranged at the mounting hole 112. Wherein, “the pole component 2 is mounted to the first shell wall 111” means that the pole component 2 and the first shell wall 111 have an assembly connection relationship, for example, can be welded or riveted, etc. Thus, the housing component 1 and the pole component 2 are respectively separate components, and the two are assembled and connected, so that the housing component 1 can be processed separately, and the pole component 2 can be processed separately, thereby facilitating the processing of the two, and being conducive to the processing and manufacturing of the battery cell 102.

[0138] In combination with Figures 4-6 , the electrode component 3 is received in the housing component 1. Illustratively, the electrode component 3 includes an active material coating portion 32 and a tab portion 33, the active material coating portion 32 is received in the receiving cavity 13, and the tab portion 33 is connected to the active material coating portion 32. The electrode component 3 includes one or more electrode assemblies 31, the portion of the current collector in the electrode assembly 31 which is coated with an active material layer constitutes the active material coating portion 32, and the portion of the current collector which is not coated with an active material layer constitutes the tab portion 33, and the tab portion 33 includes multiple layers of tab pieces 311.

[0139] The pole part 2 is located at the same side of the electrode part 3 as the first shell wall 111, that is, the pole part 2 is arranged at the side where the first shell wall 111 is located, so that the pole part 2 can be installed at the installation hole 112 of the first shell wall 111. For example, when the first shell wall 111 is located above the electrode part 3, the pole part 2 is also located above the electrode part 3; when the first shell wall 111 is located below the electrode part 3, the pole part 2 is also located below the electrode part 3; when the first shell wall 111 is located at the side of the electrode part 3, the pole part 2 is also located at the same side of the electrode part 3.

[0140] Exemplarily, the shell part 1 can be surrounded by different wall surfaces, one of which is the first shell wall 111. Taking a plane perpendicular to the penetrating direction of the installation hole 112 as a projection plane, the orthographic projection of the installation hole 112 on the projection plane completely falls within the orthographic projection of the first shell wall 111 on the projection plane, and the orthographic projection area of the installation hole 112 is smaller than the orthographic projection area of the first shell wall 111. One or more installation holes 112 can be arranged on the first shell wall 111 to meet the installation requirements of one or more pole parts 2.

[0141] In combination Figures 5-8 The electrode part 3 is connected with the pole part 2. The electrode part 3 is connected with the pole part 2 through the conductive part 4. The pole part 2 includes a pole body 21, and the active material coating part 32 is connected with the pole body 21 through the conductive part 4 and forms an electrical conduction. Exemplarily, the battery 100 includes a busbar part located outside the battery monomer 102, and the pole body 21 is connected with the busbar part to form an electrical conduction, so that multiple battery monomers 102 can be connected through the busbar part.

[0142] Exemplarily, when the pole part 2 is a negative electrode, the pole body 21 can be a copper-aluminum composite, which can include an aluminum part and a copper part. The aluminum part is arranged on the side of the copper part away from the active material coating part 32, which is easy to form a reliable connection with the aluminum busbar part and easy to connect with the copper foil tab 311 of the negative electrode. When the pole part 2 is a positive electrode, the pole body 21 can be an aluminum part, which is easy to form a reliable connection with the aluminum busbar part and easy to connect with the aluminum foil tab 311 of the positive electrode.

[0143] The connection mode of the conductive part 4 with the pole part 2 is not limited, for example, but not limited to, ultrasonic welding, ultrasonic pre-welding combined with laser welding, resistance welding, pressure fusion welding, brazing, cementation, etc.

[0144] For example, referring to Figure 6The conductive part 4 may include both a tab 33 and a conductive element 41 connected to the tab 33. The tab 33 is indirectly connected to the electrode body 21 through the conductive element 41. The conductive element 41 may be part of the electrode component 3, or it may be part of the electrode component 2, or it may be independent of both the electrode component 3 and the electrode component 2.

[0145] Therefore, by indirectly connecting the tab 33 and the pole body 21 through the conductive element 41, the length of the tab 33 can be shortened, and problems such as wrinkling, bending and breakage of the tab 311 can be improved. Furthermore, by flexibly designing the shape and material of the conductive element 41, the connection difficulty with the pole body 21 can be reduced, and the connection convenience between the conductive element 41 and the pole body 21 can be improved.

[0146] For example, refer to Figure 8 The conductive part 4 includes a tab 33, which is connected to the electrode body 21. Therefore, the conductive element 41 is not required, and the tab 33 can be directly connected to the electrode body 21. This eliminates the need for the conductive element 41 and the connection process between the conductive element 41 and the tab 33.

[0147] An insulating material is provided between the pole body 21 and the first housing wall 111 to achieve insulation between the first housing wall 111 and the pole body 21, thereby preventing the first housing wall 111 from becoming charged. For example, the insulating material can be part of the pole component 2 (e.g., insulating structure 23) and is insulated from the pole body 21.

[0148] The structure of housing component 1 is not limited. For example, combining... Figure 4 The shell component 1 includes a shell body 11 that forms the receiving cavity 13. One end of the shell body 11 has an opening 113. The shell body 11 includes a first shell wall 111. For example, the end of the shell body 111 opposite to the opening 113 is the first shell wall 111, or the shell wall adjacent to the opening 113 (such as a second shell wall 114) serves as the first shell wall 111. For another example, combined with... Figure 7 The housing component 1 includes a cover 12 that forms the receiving cavity 13, and the cover 12 is the first housing wall 111. Thus, the structural design of the housing component 1 is flexible, and the placement of the pole component 2 is flexible.

[0149] When the end of the shell 11 opposite to the opening 113 is the first shell wall 111, exemplarily, combined with Figure 4 and Figure 5, the shell member 1 can include a shell body 11 and a shell cover 12, the shell body 11 has an opening 113 at one end thereof, the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 jointly define a receiving cavity 13, and the end of the shell body 11 opposite to the opening 113 serves as the first shell wall 111; or, for example, the shell member 1 can include two shell bodies 11, each of the shell bodies 11 has an opening 113 at one end thereof, the openings 113 of the two shell bodies 11 are opposite to each other and cover each other, and the two shell bodies 11 jointly define the receiving cavity 13, and the end of one of the shell bodies 11 opposite to the opening 113 serves as the first shell wall 111.

[0150] When the shell cover 12 is the first shell wall 111, for example, in combination with Figure 7 and Figure 8 , the shell member 1 can include a shell body 11 and a shell cover 12, the shell body 11 has an opening 113 at one end thereof, the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 jointly define a receiving cavity 13, and the shell cover 12 serves as the first shell wall 111; or, for example, the shell member 1 can include a shell body 11 and two shell covers 12, the shell body 11 has openings 113 at two ends thereof, each of the openings 113 is covered by a shell cover 12, and the two shell covers 12 and the shell body 11 jointly define a receiving cavity 13, and one of the shell covers 12 serves as the first shell wall 111.

[0151] In some embodiments of the present application, in combination with Figure 4 and Figure 5 , the shell member 1 includes a shell body 11 participating in defining a receiving cavity 13, the shell body 11 has an opening 113 at one end thereof, and the end of the shell body 11 opposite to the opening 113 serves as the first shell wall 111. It can be understood that the shell body 11 is a one-piece member, i.e., the shell body 11 is a one-piece molded member, and includes the 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 towards one side of 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 the space between the first shell wall 111 and the second shell wall 114 defines a cavity, which constitutes at least part of the receiving cavity 13.

[0152] When the shell member 1 comprises a shell body 11 having an opening 113 at one end, the shell member 1 further comprises a shell body matching structure which matches with the shell body 11 to cover the opening 113 and jointly enclose the accommodation cavity 13 with the shell body 11. For example, the shell body 11 is in a semi-closed cylinder shape, and the shell body matching structure is in a flat plate shape, i.e., the shell body matching structure can be the shell cover 12, at this time, the shell member 1 can be in a combined form of the shell body 11 and the shell cover 12, for another example, the shell body 11 is in a semi-closed cylinder shape, and the shell body matching structure can be in a semi-closed cylinder shape, i.e., the shell body matching structure can be another half shell body 11, at this time, the shell member 1 can be in a combined form of two shell bodies 11, and so on, for another example, the shell body matching structure can be a shell group which is composed of multiple parts. In this way, the shell member has various forms and can be suitable for various application scenarios.

[0153] In the above technical solution, since the electrode members 3 accommodated in the shell member 1 are connected with the pole column members 2 installed on the first shell wall 111, when the battery 100 is vibrated or deformed, the pole column members 2 connected through the busbar member will pull each other, since the pole column members 2 are arranged on the end wall of the shell body 11 opposite to the opening 113, the force acting on the pole column members 2 will be preferentially transmitted to the shell body 11, and will not directly act on the shell body matching structure (for example, the shell cover 12), so that not only the distance of the force transmission to the connection position of the shell body 11 and the shell body matching structure (for example, the shell cover 12) can be prolonged, but also the shell body 11 will preferentially deform when force is applied, so as to reduce the force acting on the connection position of the shell body 11 and the shell body matching structure (for example, the shell cover 12), and further, the probability of the cracking of the connection position of the shell body 11 and the shell body matching structure (for example, the shell cover 12) in the use process of the battery 100 can be effectively reduced, and the reliability of the battery monomer 102 can be improved. Moreover, since the connection position of the shell body 11 and the shell body matching structure (for example, the shell cover 12) is not easy to crack, the wall thickness of the two is not required to be increased in order to increase the connection reliability, so as to be beneficial to reduce the weight and material cost, and be beneficial to realize the miniaturization of the battery monomer 102 or improve the energy density of the battery monomer 102. The connection mode of the shell body 11 and the shell body matching structure is not limited, for example, can be adhesion, welding, and the like.

[0154] The material of the shell member 1 is not limited, for example, includes but is not limited to aluminum shell, steel shell, aluminum plastic film, plastic or other electrolyte corrosion resistant materials.

[0155] In the following, the assembling method of the battery monomer 102 according to some embodiments of the present application is described.

[0156] Please refer to Figure 9 , Figure 9 The step flow chart of the assembling method of the battery monomer provided for some embodiments of the present application is described. In some embodiments of the present application, the assembling method of the battery monomer 102 can comprise the following steps.

[0157] Step S20, connecting the electrode component 3 with the pole piece component 2.

[0158] Exemplarily, the electrode component 3 comprises the tab portion 33, the pole piece component 2 comprises the pole body 21, and “Step S20, connecting the electrode component 3 with the pole piece component 2” can be specifically “directly or indirectly connecting the tab portion 33 with the pole body 21” to realize the electrical conduction between the electrode component 3 and the pole piece component 2.

[0159] Please refer to Figures 10A-10D , Figures 10A-10D The assembly process diagram of the battery cell provided by an embodiment of the present application is shown in FIG. 4. Exemplarily, the tab portion 33 is directly connected with the pole body 21. For example, the tab portion 33 and the pole body 21 can be directly connected by welding (such as laser welding, resistance welding, pressure fusion welding, or brazing, etc.), punching, bonding, etc.

[0160] Please refer to Figures 12A-12E , Figures 13A-13E , Figures 12A-12E The assembly process diagram of the battery cell provided by an embodiment of the present application is shown in FIG. 4. Figures 13A-13E The assembly process diagram of the battery cell provided by an embodiment of the present application is shown in FIG. 4. Exemplarily, the tab portion 33 can be indirectly connected with the pole body 21 through the conductive piece 41. At this time, “Step S20, connecting the electrode component 3 with the pole piece component 2” can comprise at least one of “connecting the conductive piece 41 with the tab portion 33” and “connecting the conductive piece 41 with the pole body 21”. For example, the conductive piece 41 and the tab portion 33 can be directly connected by welding (such as laser welding, resistance welding, pressure fusion welding, or brazing, etc.), punching, bonding, etc. For example, the conductive piece 41 and the pole body 21 can be directly connected by welding (such as laser welding, resistance welding, pressure fusion welding, or brazing, etc.), punching, bonding, etc.

[0161] Step S30, mounting the pole piece component 2 connected with the electrode component 3 to the first shell wall 111.

[0162] The pole piece component 2 can be in various forms, such as a form that cannot be disassembled as a whole, or a form that is assembled after being provided in multiple parts, and therefore “Step S30, mounting the pole piece component 2 connected with the electrode component 3 to the first shell wall 111” is understood in a broad sense, i.e., the part of the pole piece component 2 connected with the electrode component 3 can be mounted to the first shell wall 111.

[0163] Please refer to Figures 10A-10D , Figures 12A-12E , Figures 13A-13EFor example, when the electrode component 2 does not need to be assembled, "step S20, connect the electrode component 3 to the electrode component 2; step S30, install the electrode component 2 connected to the electrode component 3 to the first housing wall 111" can be specifically: "first connect the electrode component 2 to the electrode component 3, and then install the electrode component 2 to the first housing wall 111 (for example, cover the mounting hole 112 on the first housing wall 111 with the electrode component 2, and then connect the electrode component 2 to the first housing wall 111 by welding, riveting, or bonding, etc.)".

[0164] Please refer to Figures 0103A-0103D. Figures 013A-0103D are exploded views of the assembly process of a battery cell provided in one embodiment of this application. Alternatively, by way of example, when the terminal post component 2 needs to be assembled, "step S20, connect the electrode component 3 to the terminal post component 2; step S30, install the terminal post component 2 connected to the electrode component 3 to the first shell wall 111" can also be: "first complete the connection of a part of the terminal post component 2 (e.g., the first terminal post 21a) to the electrode component 3, and the connection of the remaining part of the terminal post component 2 (e.g., the second terminal post 21b) to the first shell wall 111, and then combine and connect the above two parts of the terminal post component 2 (e.g., the first terminal post 21a and the second terminal post 21b).

[0165] In the above technical solution, since the connection between electrode component 3 and terminal component 2 is completed first, and then the assembly connection between terminal component 2 and housing component 1 is completed, instead of pre-assembling the terminal component and housing component first and then connecting the electrode component and terminal component, this is beneficial to shortening the length of the conductive part 4 connecting terminal component 2 and electrode component 3, reducing the redundancy of conductive part 4 in housing component 1, reducing the space occupied by conductive part 4 in housing component 1, which is beneficial to improving the energy density of battery cell 102. Moreover, it is beneficial to reduce the risk of short circuit caused by the conductive part 4 being inserted backward into the active material coating part 32 of electrode component 3, thus improving the reliability of battery cell 102. In addition, this assembly method can achieve the assembly of battery cell 102 whether terminal component 2 is placed on housing body 11 or housing cover 12, so the installation position of terminal component 2 can be flexibly selected on housing component 1. Among them, when terminal component 2 is placed on housing body 11, it is beneficial to reduce the cracking problem at the connection between housing body 11 and housing cover 12, thus improving the reliability of battery cell 102.

[0166] For example, combined Figure 4 and Figure 5When the shell member 1 comprises a shell body 11 and a shell cover 12, the shell body 11 has an opening 113, and the shell cover 12 covers the opening 113, the end wall of the shell body 11 opposite to the opening 113 is the first shell wall 111, the first shell wall 111 has the mounting hole 112, and the pole member 2 is mounted at the mounting hole 112 of the first shell wall 111. If the pole member 2 is mounted at the mounting hole 112 of the first shell wall 111 first, and then the electrode member 3 is installed in the shell body 11, it is difficult to connect the electrode member 3 and the pole member 2. In the embodiment of the application, the connection of the electrode member 3 and the pole member 2 is performed first, and then the connection of the pole member 2 and the shell member 1 is performed, so that the connection requirements of the electrode member 3 and the pole member 2 can be met, and the connection requirements of the pole member 2 and the shell member 1 can also be met.

[0167] When the battery 100 is vibrated or deformed, the pole members 2 connected by the bus member are pulled by each other. Since the pole members 2 are arranged on the first shell wall 111 of the shell body 11 opposite to the opening 113, the force acting on the pole members 2 is preferentially transmitted to the shell body 11, and does not directly act on the shell cover 12, so that not only the distance of the force transmission to the connection (such as the welding seam) between the shell body 11 and the shell cover 12 can be prolonged, but also the shell body 11 preferentially deforms when the force is applied, so as to reduce the force acting on the connection (such as the welding seam) between the shell body 11 and the shell cover 12, thereby effectively reducing the probability of cracking of the connection (such as the welding seam) between the shell body 11 and the shell cover 12 during use of the battery 100, and improving the reliability of the battery monomer 102. Moreover, since the connection (such as the welding seam) between the shell body 11 and the shell cover 12 is not easy to crack, the wall thickness of the connection (such as the welding seam) between the shell body 11 and the shell cover 12 does not need to be increased to improve the connection reliability, so as to reduce the weight and material cost.

[0168] Exemplarily, in combination with Figure 7When the shell member 1 comprises the shell body 11 and the shell cover 12, the shell body 11 has the opening 113, the shell cover 12 covers the opening 113, the shell cover 12 serves as the first shell wall 111, the first shell wall 111 has the mounting hole 112, and the pole member 2 is mounted at the mounting hole 112 of the first shell wall 111. If the pole member 2 is mounted on the shell cover 12 first, and then the pole member 2 is connected with the electrode member 3, when the pole member 2 is connected with the electrode member 3, the length of the conductive part 4 needs to be set relatively long (for example, greater than half of the width of the shell cover 12), so that the electrode member 3 can be located on one side in the width direction of the shell cover 12. In this way, the length of the conductive part 4 is relatively long, and the redundancy of the conductive part 4 after assembly is relatively large, which is prone to cause the risk of inserting into the active material coating part 32 and causing short circuit. In the embodiment of the present application, the pole member 2 is connected with the electrode member 3 first, and then the pole member 2 is mounted on the shell cover 12, so that when the pole member 2 is connected with the electrode member 3, the length of the conductive part 4 is sufficient to enable the electrode member 3 to be located on one side in the width direction of the pole member 2, thereby shortening the length of the conductive part 4 (for example, greater than half of the width of the pole member 2), reducing the redundancy of the conductive part 4 after assembly, reducing the risk of inserting into the active material coating part 32 and causing short circuit of the conductive part 4, improving the reliability of the battery monomer 102, and reducing the material and cost of the conductive part 4.

[0169] In summary, the assembly method of the battery monomer 102 according to the embodiment of the present application enables the assembly position of the pole member 2 on the shell member 1 to be unrestricted, that is, the pole member 2 can be arranged on the shell body 11 or the shell cover 12, and the installation position of the pole member 2 on the shell member 1 can be flexibly selected, which is beneficial to meet the production needs of different types of battery monomers 102. When the pole member 2 is arranged on the shell body 11, it is beneficial 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 monomer 102. When the pole member 2 is arranged on the shell cover 12, it is beneficial to shorten the length of the conductive part 4, reduce the redundancy of the conductive part 4 after assembly, reduce the risk of insertion, and improve the reliability of the battery monomer 102.

[0170] In some embodiments of the present application, in combination with Figure 4 and Figure 7The pole column component 2 comprises a pole column body 21, a transition structure 22 and an insulation structure 23. The electrode component 3 is connected with the pole column body 21. The transition structure 22 surrounds the pole column body 21 and is connected with the first shell wall 111. The insulation structure 23 is insulatively fitted between the transition structure 22 and the pole column body 21. The transition structure 22 surrounds the pole column body 21 along the circumference of the mounting hole 112, so that the transition structure 22 can connect the pole column body 21 and the first shell wall 111 at the outer circumferential region of the pole column body 21. The insulation structure 23 insulates the fitting position of the transition structure 22 and the pole column body 21, so as to prevent the pole column body 21 and the transition structure 22 from conducting and short-circuiting. The connection mode of the transition structure 22 and the first shell wall 111 is not limited, for example, welding, riveting, punching, bonding and the like.

[0171] Please refer to Figure 14 , Figure 14 The step flow chart of the assembling method of the battery cell provided in some embodiments of the present application is provided, and please refer to Figures 10A-10D 、 Figures 12A-12E 、 Figures 13A-13E In some embodiments of the present application, when the pole column component 2 comprises the pole column body 21, the transition structure 22 and the insulation structure 23, the step S20 of connecting the electrode component 3 with the pole column component 2 can specifically comprise the step S20a of connecting the electrode component 3 with the pole column body 21. The step S30 of mounting the pole column component 2 connected with the electrode component 3 to the first shell wall 111 can specifically comprise the step S30a of arranging the pole column component 2 connected with the electrode component 3 at the mounting hole 112 and connecting the transition structure 22 with the first shell wall 111.

[0172] In the above technical solution, the pole column component 2 has a simple structure and is easy to process. Since the pole column component 2 comprises the pole column body 21 and the transition structure 22, the shape and size of the pole column body 21 and the shape and size of the transition structure 22 can be designed separately based on different factors, so as to flexibly adapt to the connection requirements of the shell component 1 and the electrode component 3 of different forms, and increase the application range of the pole column component 2.

[0173] Please refer to Figure 15 , Figure 15 The step flow chart of the assembling method of the battery cell provided in some embodiments of the present application is provided, and please refer to Figures 10A-10DExemplarily, the step S20a of connecting the electrode component 3 with the pole body 21 can specifically include: a step S211 of placing the electrode component 3 and the conductive part 4 connected with the electrode component 3 on the inner side of the first shell wall 111, and passing the conductive part 4 out of the first shell wall 111 to the outer side of the first shell wall 111 through the mounting hole 112; a step S212 of connecting the conductive part 4 passed out of the first shell wall 111 to the outer side of the first shell wall 111 with the pole body 21 of the pole component 2 placed on the outer side of the first shell wall 111.

[0174] The inner side of the first shell wall 111 refers to the side of the first shell wall 111 in the thickness direction that faces the active material coating part 32, and the outer side of the first shell wall 111 refers to the side of the first shell wall 111 in the thickness direction that is away from the active material coating part 32. In this way, since the conductive part 4 is not connected with the pole component 2 when passing through the mounting hole 112, the conductive part 4 is facilitated to pass through the mounting hole 112, and the operation convenience is improved. Moreover, since the welding position of the pole component 2 and the conductive part 4 is located on the outer side of the first shell wall 111, the problem that the conductive debris formed in the welding process enters the inside of the shell body 11 to damage the electrode component 3 can be improved.

[0175] Exemplarily, the mounting hole 112 is a long strip-shaped hole (for example, a rectangle, an ellipse, a racetrack shape, etc.), and the part of the conductive part 4 that needs to pass through the mounting hole 112 is a long strip shape that matches the shape of the mounting hole 112. At this time, the thickness direction of this part of the conductive part 4 can be adjusted to match the width direction of the mounting hole 112, and the length direction of this part of the conductive part 4 can be arranged to form an angle with the length direction of the mounting hole 112. In this way, this part of the conductive part 4 can smoothly pass through the mounting hole 112, the assembly efficiency is improved, and the risk of the conductive part 4 colliding and scratching the shell component 1 is reduced. However, the present application is not limited to this, and the mounting hole 112 and the part of the conductive part 4 that needs to pass through the mounting hole 112 can also be processed into other shapes, such as a circle, a polygon, etc. The "racetrack shape" is a long circle, and the long circle can be generally considered to be composed of a rectangle and two semicircles. The outline shape of the long circle can be generally considered to be the outline shape of the rectangle after the two short sides of the rectangle are replaced by two circular arcs.

[0176] Further, please refer to Figure 16 , Figure 16 The step flow chart of the battery cell assembly method provided by some embodiments of the present application, and again refer to Figures 10A-10D, the step S30a of disposing the pole piece 2 connected with the electrode piece 3 at the mounting hole 112 and connecting the adapter structure 22 with the first shell wall 111 can specifically include: a step S311 of disposing the pole piece 2 connected with the conductive part 4 from the outer side of the first shell wall 111 at the mounting hole 112, so that the adapter structure 22 is abutted on the outer side of the first shell wall 111; and a step S312 of connecting the adapter structure 22 with the first shell wall 111 from the outer side of the first shell wall 111. Here, the adapter structure 22 is abutted on the outer side of the first shell wall 111, which means that a part of the adapter structure 22 is supported on a part of the first shell wall 111 away from the active material coated part 32.

[0177] Therefore, since the pole piece 2 is disposed from the outer side of the first shell wall 111 at the mounting hole 112, so that the adapter structure 22 is abutted on the outer side of the first shell wall 111, and the adapter structure 22 is connected with the first shell wall 111 from the outer side of the first shell wall 111, the assembly and connection of the pole piece 2 with the first shell wall 111 are facilitated, and the connection reliability of the pole piece 2 with the first shell wall 111 is improved.

[0178] For example, referring to Figures 10A-10D In the assembly of the battery cell 102, the multi-layer tab piece 311 in the tab part 33 can be connected to form the gathered part 313 first, then the electrode piece 3 is disposed on the inner side of the first shell wall 111, and the gathered part 313 is led out to the outer side of the first shell wall 111 from the mounting hole 112, the gathered part 313 is connected with the pole piece 2 disposed on the outer side of the first shell wall 111 on the outer side of the first shell wall 111, then the pole piece 2 connected with the gathered part 313 is disposed from the outer side of the first shell wall 111 at the mounting hole 112, and then the adapter structure 22 is welded and connected with the first shell wall 111 from the outer side of the first shell wall 111. The processing steps of the embodiment are applicable to the scenario that the shell cover 12 is the first shell wall 111, and also applicable to the scenario that the shell body 11 includes the first shell wall 111.

[0179] For example, referring to Figure 17 , Figure 17 The step flow chart of the assembly method of the battery cell provided by some embodiments of the application, and referring again to Figures 10A-10DWhen the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, the "step S211, placing the electrode member 3 and the conductive part 4 connected with the electrode member 3 on the inner side of the first shell wall 111, and making the conductive part 4 pass through the mounting hole 112 to the outer side of the first shell wall 111" can specifically include: "step S2111, adjusting the relative positions of the shell body 11, the electrode member 3 and the conductive part 4, so that the electrode member 3 is located on the side of the conductive part 4 connected therewith away from the shell body 11, and the opening 113 of the shell body 11 faces the conductive part", and "step S2112, loading the electrode member 3 and the conductive part 4 into the shell body 11". In this way, by arranging the pole member 2 at the end of the shell body 11 opposite to the opening 113, the cracking problem at the connection between the shell body 11 and the shell cover 12 can be improved, and the reliability of the battery monomer 102 can be improved.

[0180] The "step S2111, adjusting the relative positions of the shell body, the electrode member and the conductive part, so that the electrode member is located on the side of the conductive part connected therewith away from the shell body" can be achieved by adjusting the position of the shell body 11, or by adjusting the positions of the electrode member and the conductive part. The "step S2112, loading the electrode member and the conductive part into the shell body" can be achieved by pushing the electrode member, or by sleeving the shell body.

[0181] Exemplarily, the action of making the conductive part 4 pass through the mounting hole 112 to the outer side of the first shell wall 111 can be achieved by the electrode member 3 being loaded into the shell body 11. That is, the action of the conductive part 4 passing through the mounting hole 112 is completed along with the action of the electrode member 3 being loaded into the shell, so that the operation is convenient and the processing efficiency is improved.

[0182] Exemplarily, the action of making the conductive part 4 pass through the mounting hole 112 to the outer side of the first shell wall 111 can be achieved by the electrode member 3 being loaded into the shell body 11. That is, the action of the conductive part 4 passing through the mounting hole 112 is completed along with the action of the electrode member 3 being loaded into the shell, so that the operation is convenient and the processing efficiency is improved. Figures 10A-10D When assembling the battery monomer 102, the multiple-layer tab pieces 311 in the tab part 33 can be connected to form the gathered part 313 first, and then the electrode member 3 is loaded into the shell body 11 in the direction that the gathered part 313 faces the mounting hole 112 relative to the active material coating part 32. With the movement of the electrode member 3 being loaded into the shell body 11, the gathered part 313 passes out to the outer side of the mounting hole 112, and the gathered part 313 and the pole member 2 placed on the outer side of the first shell wall 111 are connected on the outer side of the first shell wall 111. Then, the pole member 2 connected with the gathered part 313 is covered on the outer side of the first shell wall 111 from the mounting hole 112, and then the pole member 2 covered on the mounting hole 112 is welded and connected with the first shell wall 111.

[0183] Exemplarily, the action of making the conductive part 4 pass through the mounting hole 112 to the outer side of the first shell wall 111 can be achieved by the electrode member 3 being loaded into the shell body 11. That is, the action of the conductive part 4 passing through the mounting hole 112 is completed along with the action of the electrode member 3 being loaded into the shell, so that the operation is convenient and the processing efficiency is improved. Figures 18A-18G , Figures 18A-18G The assembly process diagram of the battery monomer provided by an embodiment of the present application is provided, and reference is made to Figure 19 , Figure 19A flow chart of the assembling method of the battery cell is provided for some embodiments of the present application. Exemplarily, when the shell cover 12 is the first shell wall 111, between "step S211, placing the electrode component 3 and the conductive part 4 connected with the electrode component 3 on the inner side of the first shell wall 111, and passing the conductive part 4 out of the first shell wall 111 to the outer side of the first shell wall 111" and "step S30a, disposing the pole component 2 connected with the electrode component 3 at the mounting hole 112, and connecting the adapter structure 22 with the first shell wall 111", there are further included: "step S43, sleeving the shell body 11 on the electrode component 3", and "step S44, connecting the shell body 11 with the shell cover 12".

[0184] In which, "step S212, connecting the conductive part 4 passed out of the first shell wall 111 with the pole body 21 of the pole component 2 disposed on the outer side of the first shell wall 111" can be performed after "step S44, connecting the shell body 11 with the shell cover 12" (for example, as shown in Figures 18A-18G In other embodiments of the present application, "step S212, connecting the conductive part 4 passed out of the first shell wall 111 with the pole body 21 of the pole component 2 disposed on the outer side of the first shell wall 111" can also be performed before "step S43, sleeving the shell body 11 on the electrode component 3".

[0185] Therefore, by first completing the connection of the shell body 11 with the shell cover 12, and then performing the connection of the pole component 2 with the shell cover 12, the electrode component 3 can be accommodated by the shell body 11 and the shell cover 12 can be supported, which facilitates the positioning and supporting of the shell cover 12, so as to facilitate the connection of the shell cover 12 with the adapter structure 22, and improve the connection reliability of the shell cover 12 with the pole component 2. The connection manner of the shell body 11 with the shell cover 12 is not limited, for example, can be welding, bonding, etc.

[0186] Please refer to Figures 18A-18G again, and refer to Figure 20 , Figure 20The flow chart of the assembling method of the battery cell is provided for some embodiments of the present application. In some embodiments of the present application, when the shell cover 12 is the first shell wall 111, the inner side of the shell cover 12 can have an insulating support 121, and the "step S20a, connecting the electrode component 3 with the pole body 21" can further include the "step S41, placing the electrode component 3 with the conductive part 4 connected thereto downward, and placing the shell cover 12 with the insulating support 121 upward", the "step S42, wrapping the insulating film 7 outside the electrode component 3 supported on the top of the insulating support 121, so that the insulating film 7 is connected with the insulating support 121", which are performed before the "step S43, wrapping the shell body 11 outside the electrode component 3". The "step S43, wrapping the shell body 11 outside the electrode component 3" specifically includes the "step S431, placing the shell body 11 with the opening 113 downward, and wrapping the shell body 11 from top to bottom outside the electrode component 3 wrapped with the insulating film 7".

[0187] The "step S41, placing the electrode component 3 with the conductive part 4 connected thereto downward, and placing the shell cover 12 with the insulating support 121 upward" can be performed before the "step S211, placing the electrode component 3 and the conductive part 4 connected with the electrode component 3 on the inner side of the first shell wall 111, and passing the conductive part 4 out of the mounting hole 112 to the outer side of the first shell wall 111" (i.e., the conductive part 4 can be passed first, and then the relative positions of the two are placed), or can also be performed after the "step S211, placing the electrode component 3 and the conductive part 4 connected with the electrode component 3 on the inner side of the first shell wall 111, and passing the conductive part 4 out of the mounting hole 112 to the outer side of the first shell wall 111" (i.e., the relative positions of the two can be placed first, and then the conductive part 4 is passed downward).

[0188] The "step S42, wrapping the insulating film 7 outside the electrode component 3 supported on the top of the insulating support 121, so that the insulating film 7 is connected with the insulating support 121" is performed in the state that the insulating support 121 is supported on the bottom of the active material coating part 32, and the conductive part 4 is passed out of the mounting hole 112 to the outer side of the first shell wall 111. Because in this state, the electrode component 3 does not need to be supported and limited by other clamps, it is beneficial for quick operation.

[0189] In the above technical solution, when the shell body 11 is wrapped outside the electrode component 3, since the shell cover 12 is not connected with the electrode component 3, by arranging the insulating support 121 on the inner side of the shell cover 12 (i.e., the side away from the active material coating part 32), the electrode component 3 is supported from the bottom of the electrode component 3, so that the problem of separation of the electrode component 3 from the shell cover 2 can be avoided without other limiting clamps, and thus the shell body 11 only needs to be directly wrapped from top to bottom during assembly, so that the assembly process can be simplified, and the use of limiting clamps and the like can be reduced.

[0190] Please refer to again Figures 18A-18G and in combination Figure 21 , Figure 21 A flow chart of the steps of the assembling method of the battery cell provided by some embodiments of the present application; in some embodiments of the present application, when the cover 12 is the first shell wall 111, the assembling of the battery cell 102 can be sequentially performed: "step S41, placing the electrode member 3 with the conductive part 4 connected thereto downward, and placing the cover 12 with the insulating support 121 upward", "step S211, placing the electrode member 3 and the conductive part 4 connected to the electrode member 3 inside the first shell wall 111, and passing the conductive part 4 out of the first shell wall 111 through the mounting hole 112", "step S42, wrapping the electrode member 3 supported on the top of the insulating support 121 with the insulating film 7, so that the insulating film 7 is connected with the insulating support 121", "step S431, placing the shell body 11 with the opening 113 downward, and wrapping the shell body 11 on the electrode member 3 wrapped with the insulating film 7 from top to bottom", "step S44, connecting the shell body 11 with the cover 12", "step S212, connecting the conductive part 4 passed out of the first shell wall 111 with the pole member 2 with the pole body 21 placed outside the first shell wall 111", "step S311, covering the pole member 2 connected with the conductive part 4 with the first shell wall 111 outside the mounting hole 112, so that the adapter structure 22 is stopped against the outside of the first shell wall 111", "step S312, connecting the adapter structure 22 with the first shell wall 111 from the outside of the first shell wall 111".

[0191] Exemplarily, please refer again to Figures 18A-18GIn assembling the battery cell 102, a plurality of electrode assemblies 31 are stacked in the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure), the plurality of electrode assemblies 31 are bundled by the binder 8 (e.g., blue glue), the plurality of electrode assemblies 31 are stacked with the polar multi-layer tab sheet 311 and gathered to form the tab sheet part 312, the tab sheet part 312 is clamped between the two clamping parts 4110 of the conductive part 41, and the tab sheet part 312 and the clamping parts 4110 are welded to obtain the conductive part 4 combined by the tab part 33 and the conductive part 41, the shell cover 12 is placed below the active material coating part 32, the shell cover 12 is placed with the insulating support 121 upward, the active material coating part 32 is supported above the insulating support 121, and then the insulating film 7 is wrapped outside the active material coating part 32, and the lower end of the insulating film 7 is hot-melt connected with the insulating support 121; then, the shell body 11 is placed with the opening 113 downward, the shell body 11 is sleeved outside the active material coating part 32 from top to bottom, and the lower end of the shell body 11 is welded with the shell cover 12. After that, the shell body 11 is placed horizontally, the mounting hole 112 is open to the horizontal direction, the conductive part 4 is connected with the pole part 2 placed outside the shell cover 12 on the outside of the shell cover 12, and then the pole part 2 connected with the conductive part 4 is covered on 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, and the pole part 2 is located at the top of the shell cover 12, and the adapter structure 22 is welded and fixed with the shell cover 12.

[0192] Please refer to Figure 22 , Figure 22 The step flow chart of the assembling method of the battery cell provided for some embodiments of the present application is provided, and reference is made to Figures 23A-23D , Figures 23A-23D The assembly process of the battery cell provided for an embodiment of the present application is shown in the exploded view; for example, the step S30a of "arranging the pole part 2 connected with the electrode part 3 at the mounting hole 112, and connecting the adapter structure 22 with the first shell wall 111" can specifically include: the step S321 of "arranging the pole part 2 connected with the electrode part 3 from the inside of the first shell wall 111 to the outside of the first shell wall 111 through the mounting hole 112"; the step S322 of "covering the pole part 2 arranged on the outside of the first shell wall 111 on the mounting hole 112 from the outside of the first shell wall 111, so that the adapter structure 22 is abutted on the outside of the first shell wall 111"; and the step S323 of "connecting the adapter structure 22 with the first shell wall 111 from the outside of the first shell wall 111".

[0193] Here, "inner side of the first shell wall 111" refers to the side of the first shell wall 111 facing the active material coating portion 32 in the thickness direction; "outer side of the first shell wall 111" refers to the side of the first shell wall 111 away from the active material coating portion 32 in the thickness direction. The transition structure 22 abutting against the outer side of the first shell wall 111 means that the transition structure 22 is partially supported on a localized side of the first shell wall 111 away from the active material coating portion 32.

[0194] Therefore, since the electrode component 3 is connected to the terminal component 2 first, and then the terminal component 2 is passed through the mounting hole 112, there is no need to consider avoiding the first shell wall 111 when connecting the electrode component 3 and the terminal component 2. In other words, when connecting the electrode component 3 and the terminal component 2, the terminal component 2 and the electrode component 3 are not located on opposite sides of the first shell wall 111. This helps to further shorten the length of the conductive part 4, reduce the redundancy of the conductive part 4 after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell 102. Moreover, since the welding position of the terminal component 2 and the electrode component 3 is located on the outside of the shell 11, the problem of conductive debris formed during the welding process entering the interior of the shell 11 and damaging the electrode component 3 can be improved. Furthermore, since the pole piece 2 is installed on the mounting hole 112 from the outside of the first housing wall 111, the adapter structure 22 abuts against the outside of the first housing wall 111, and the adapter structure 22 is connected to the first housing wall 111 from the outside of the first housing wall 111, so as to facilitate the assembly and connection of the pole piece 2 and the first housing wall 111, which helps to improve the connection reliability of the pole piece 2 and the first housing wall 111.

[0195] For example, combined Figures 23A-23D When assembling the battery cell 102, the multi-layered tabs 311 in the tab portion 33 can be connected to form a gathered portion 313. Then, the gathered portion 313 is connected to the terminal post component 2. The terminal post component 2 with the gathered portion 313 is passed from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111. Then, the terminal post component 2 with the gathered portion 313 is placed on the mounting hole 112 from the outside of the first shell wall 111. Finally, the terminal post component 2 placed on the mounting hole 112 is welded to the first shell wall 111. The processing steps of this embodiment are applicable to both scenarios where the shell cover 12 serves as the first shell wall 111 and scenarios where the shell body 11 includes the first shell wall 111.

[0196] Please refer to Figure 25 , Figure 25 The flowchart illustrates the steps of the battery cell assembly method provided in some embodiments of this application, and is referred again to Figures 23A-23DIn some embodiments of this application, the mounting hole 112 is an elongated hole (e.g., rectangular, elliptical, racetrack-shaped, etc.), and the electrode post 2 is formed into an elongated structure that matches the shape of the mounting hole 112. "Step S321, extending the electrode post 2 connected to the electrode post 3 from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111" may specifically include: "Step S3213, adjusting the placement angle of the electrode post 2 so that the thickness direction of the electrode post 2 matches the width direction of the mounting hole 112, and the length direction of the electrode post 2 forms an angle with the length direction of the mounting hole 112"; "Step S3214, extending the electrode post 2 through the mounting hole 112 to the outside of the first shell wall 111 according to the placement angle."

[0197] Therefore, by first adjusting the placement angle of the terminal component 2 and then passing it through the mounting hole 112, the terminal component 2 can pass smoothly through the mounting hole 112, improving assembly efficiency and reducing the risk of collision and scratches between the terminal component 2 and the housing component 1. Furthermore, by setting the terminal component 2 as an elongated structure matching the shape of the mounting hole 112, the terminal component 2 can be adjusted to pass through the mounting hole 112 at an angle close to its thickness direction and width direction. After passing through the mounting hole 112, the thickness direction of the terminal component 2 can be rotated to be close to the thickness direction of the first housing wall 111. This reduces the space required for the flipping movement of the terminal component 2, thereby shortening the length of the conductive part 4, saving materials, reducing costs, and reducing redundancy in the conductive part 4, thus reducing the space occupied by the conductive part 4 in the receiving cavity 13 and improving the energy density of the battery cell 102. However, this application is not limited to this; the mounting hole 112 and the terminal component 2 can also be processed into other shapes, such as circles, polygons, etc.

[0198] Please refer to Figure 26 , Figure 26 This application provides assembly diagrams of mounting holes and pole post components in some embodiments (e.g., Figure 26 This can be understood as the pole piece 2 passing through the mounting hole 112 in a direction perpendicular to the plane of the paper. Specifically, making the length direction of the pole piece 2 form an angle with the length direction of the mounting hole 112 can be achieved by aligning the length direction of the pole piece 2 with the diagonal direction of the mounting hole 112. Therefore, by arranging the length direction of the pole piece 2 as described above, it is beneficial for the pole piece 2 to pass smoothly through the mounting hole 112, improving assembly efficiency and reducing the risk of collision and scratches between the pole piece 2 and the housing component 1.

[0199] Please refer to Figure 27 , Figure 27 This application provides assembly diagrams of mounting holes and pole post components for other embodiments (e.g., Figure 27This can be understood as the pole piece 2 passing through the mounting hole 112 along the direction of the arrow; or, by way of example, the length direction of the pole piece 2 is made at an angle to the length direction of the mounting hole 112. Specifically, the length direction of the pole piece 2 extends from one end of the mounting hole 112 to the other end, and is inclined to the length direction of the mounting hole 112. Thus, by arranging the length direction of the pole piece 2 as described above, it is beneficial for the pole piece 2 to pass smoothly through the mounting hole 112, improving assembly efficiency and reducing the risk of the pole piece 2 bumping or scratching against the housing part 1.

[0200] Please refer to Figure 28 , Figure 28 The flowchart illustrates the steps of a battery cell assembly method provided in some embodiments of this application. In some embodiments of this application, when the end of the housing 11 opposite to the opening 113 is the first housing wall 111; "Step S321, extending the electrode post 2 connected to the electrode component 3 from the inside of the first housing wall 111 through the mounting hole 112 to the outside of the first housing wall 111" may specifically include: "Step S3211, adjusting the relative positions of the housing 11, the electrode component 3, and the electrode post 2, so that the electrode component 3 is located on the side of the electrode post 2 connected to it away from the housing 11, and the opening 113 of the housing 11 faces the electrode post 2"; "Step S3212, installing the electrode component 3 and the electrode post 2 into the housing".

[0201] In the above technical solution, by setting the electrode post 2 at the end opposite to the opening 113 of the housing 11, it is beneficial to improve the cracking problem at the connection between the housing 11 and the cover 12 and improve the reliability of the battery cell 102.

[0202] In some embodiments of this application, please refer again to Figure 28 The step S321, "transferring the electrode component 2 connected to the electrode component 3 from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111", can specifically include the following steps performed sequentially: "Step S3211, adjusting the relative positions of the shell 11, the electrode component 3, and the electrode component 2 so that the electrode component 3 is located on the side of the electrode component 2 connected to it away from the shell 11, and the opening 113 of the shell 11 faces the electrode component 2", "Step S3212, inserting the electrode component 3 and the electrode component 2 into the shell", "Step S3213, adjusting the placement angle of the electrode component 2 so that the thickness direction of the electrode component 2 matches the width direction of the mounting hole 112, and the length direction of the electrode component 2 forms an angle with the length direction of the mounting hole 112", and "Step S3214, allowing the electrode component 2 to pass through the mounting hole 112 to the outside of the first shell wall 111 according to the placement angle". That is, after installing the electrode component 3 and the pole component 2 into the housing, the placement angle of the pole component 2 is then adjusted.

[0203] The execution sequence of "step S321, extending the electrode post component 2 connected to the electrode component 3 from the inside of the first housing wall 111 through the mounting hole 112 to the outside of the first housing wall 111" is not limited to the above embodiment; please refer to [the relevant documentation]. Figure 29 , Figure 29 The flowchart illustrates the steps of the battery cell assembly method provided in some embodiments of this application. For example, the assembly can also be performed in the following order: "Step S3211: Adjust the relative positions of the housing 11, electrode component 3, and terminal component 2, so that the electrode component 3 is located on the side of the terminal component 2 connected to it away from the housing 11, and the opening 113 of the housing 11 faces the terminal component 2"; "Step S3213: Adjust the placement angle of the terminal component 2, so that the thickness direction of the terminal component 2 matches the width direction of the mounting hole 112, and the length direction of the terminal component 2 forms an angle with the length direction of the mounting hole 112"; "Step S3212: Install the electrode component 3 and the terminal component 2 into the housing"; "Step S3214: Make the terminal component 2 protrude through the mounting hole 112 to the outside of the first housing wall 111 according to the placement angle." That is, before installing the electrode component 3 and the terminal component 2 into the housing, the placement angle of the terminal component 2 is adjusted first.

[0204] For example, please refer to Figures 30A-30D , Figures 30A-30D This is an exploded view of the assembly process of a battery cell according to an embodiment of this application; when the end wall opposite the opening 113 of the housing 11 serves as the first housing wall 111, when assembling the battery cell 102, the multi-layered tabs 311 in the tab portion 33 can be connected to form a gathered portion 313, and then the gathered portion 313 can be connected to the terminal post component 2. Next, the terminal post component 2 is placed on the side of the electrode component 3 near the mounting hole 112, so that the terminal post component 2 and the electrode component 3 can be installed into the housing 11. The movement of the electrode component 3 into the housing 11 causes the electrode post component 2 to move close to the mounting hole 112. At this time, the placement angle of the electrode post component 2 can be adjusted to the above state. Then, the electrode component 3 is pushed into the housing 11 so that the electrode post component 2, which meets the placement angle, can pass through the mounting hole 112. Then, the electrode post component 2 connected with the retractable part 313 is placed on the mounting hole 112 from the outside of the first housing wall 111. After that, the electrode post component 2 placed on the mounting hole 112 is connected to the first housing wall 111.

[0205] For example, the action of the electrode post 2 passing through the mounting hole 112 can be completed smoothly as the electrode post 3 enters the housing, thereby making the operation convenient and improving the processing efficiency.

[0206] Please refer to Figures 31A-31D and combined Figure 32 and Figure 33 , Figures 31A-31D An exploded view of the assembly process of a battery cell provided in one embodiment of this application; Figure 32 A flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application; Figure 33 The flowchart illustrates the steps of assembling a battery cell according to some embodiments of this application. In some embodiments of this application, when the cover is the first shell wall 111, after "step S321, passing the electrode post 2 connected to the electrode component 3 from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111", it may also include: "step S43, fitting the shell body 11 over the electrode component 3" and "step S44, connecting the shell body 11 to the cover 12".

[0207] Among them, "step S322, covering the mounting hole 112 with the pole post component 2 protruding to the outside of the first shell wall 111 from the outside of the first shell wall 111, so that the adapter structure 22 abuts against the outside of the first shell wall 111"; "step S323, connecting the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111" can be performed after "step S44, connecting the shell body 11 to the shell cover 12" (e.g.) Figure 32 As shown, since the connection between the shell body 11 and the shell cover 12 is completed first, and then the pole post component 2 is connected to the shell cover 12, the shell body 11 can be used to support the shell cover 12. This facilitates the positioning and support of the shell cover 12, so as to facilitate the connection between the shell cover 12 and the adapter structure 22, and improves the reliability of the connection between the shell cover 12 and the pole post component 2.

[0208] Alternatively, in other embodiments of this application, "step S322, covering the mounting hole 112 with the electrode post 2 extending to the outside of the first shell wall 111 from the outside of the first shell wall 111, so that the adapter structure 22 abuts against the outside of the first shell wall 111"; and "step S323, connecting the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111" can also be performed before "step S43, fitting the shell 11 over the electrode post 3" (e.g., Figure 33 As shown in the figure, when connecting the pole component 2 and the cover 12, since the body 11 and the cover 12 are not yet connected, the force connecting the pole component 2 and the cover 12 will not be transmitted to the connection point of the body 11 and the cover 12, thus improving the cracking problem at the connection point of the body 11 and the cover 12.

[0209] The connection method between the shell body 11 and the shell cover 12 is not limited; for example, it can be welding, bonding, etc.

[0210] Please combine Figures 34A-34D and refer to Figure 35 , Figures 34A-34D An exploded view of the assembly process of a battery cell provided in one embodiment of this application; Figure 35This is a flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application. In some embodiments of this application, "step S30a, placing the electrode post 2 connected to the electrode component 3 at the mounting hole 112 and connecting the adapter structure 22 to the first shell wall 111" may specifically include: "step S331, placing both the electrode post 2 connected to the electrode component 3 and the electrode component 3 inside the first shell wall 111"; "step S332, covering the mounting hole 112 from the inside of the first shell wall 111 with the electrode post 2 connected to the electrode component 3, so that the adapter structure 22 abuts against the inside of the first shell wall 111"; "step S333, connecting the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111".

[0211] In the above technical solution, since the terminal post 2 covers the mounting hole 112 from the inside of the first shell wall 111, neither the conductive part 4 nor the terminal post 2 needs to pass through the mounting hole 112, thereby reducing processing steps and operational difficulty. Furthermore, since the adapter structure 22 connects to the first shell wall 111 from the outside, it facilitates the assembly and connection of the terminal post 2 and the first shell wall 111, improving the connection reliability between the terminal post 2 and the first shell wall 111. In addition, since the electrode part 3 is connected to the terminal post 2 first, and then the terminal post 2 and electrode part 3 are placed inside the first shell wall 111, there is no need to consider avoiding the first shell wall 111 when connecting the electrode part 3 and the terminal post 2. In other words, when connecting the electrode part 3 and the terminal post 2, the terminal post 2 and electrode part 3 are not located on opposite sides of the first shell wall 111, which helps to further shorten the length of the conductive part 4, reduce redundancy of the conductive part 4 after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell 102. Furthermore, since the welding position of the pole piece 2 and the electrode piece 3 is located outside the housing 11, the problem of conductive debris generated during the welding process entering the interior of the housing 11 and damaging the electrode piece 3 can be improved.

[0212] For example, combined Figures 34A-34D When assembling the battery cell 102, the multi-layered tabs 311 in the tab portion 33 can be connected to form a gathered portion 313. Then, the gathered portion 313 is connected to the terminal post component 2. The terminal post component 2 with the electrode component 3 connected to it and the electrode component 3 are placed inside the first shell wall 111. Next, the terminal post component 2 with the electrode component 3 connected to it is placed from the inside of the first shell wall 111 onto the mounting hole 112. Then, the terminal post component 2 placed on the mounting hole 112 is connected to the first shell wall 111. Exemplarily, the processing steps of this embodiment are applicable to both scenarios where the shell cover 12 serves as the first shell wall 111 and scenarios where the shell body 11 includes the first shell wall 111.

[0213] Please refer to Figures 36A-36D and combined Figure 37 , Figures 36A-36D An exploded view of the assembly process of a battery cell provided in one embodiment of this application; Figure 37 This is a flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application. In some embodiments of this application, when the end of the housing 11 opposite to the opening 113 is the first housing wall 111, "step S331, placing both the electrode post 2 connected to the electrode component 3 and the electrode component 3 inside the first housing wall 111" may specifically include: "step S3311, adjusting the relative positions of the housing 11, the electrode component 3, and the electrode post 2, so that the electrode component 3 is located on the side of the electrode post 2 connected to it away from the housing 11, and the opening 113 of the housing 11 faces the electrode post 2"; "step S3312, inserting the electrode component 3 and the electrode post 2 into the housing 11".

[0214] Therefore, by placing the terminal component 2 on the housing 11, it is beneficial to improve the cracking problem at the connection between the housing 11 and the cover 12 and improve the reliability of the battery cell 102.

[0215] For example, please refer to Figures 36A-36D When the end wall opposite the opening 113 of the housing 11 is used as the first housing wall 111, when assembling the battery cell 102, the multi-layer electrode tabs 311 in the tab portion 33 can be connected to form a folding portion 313. Then, the folding portion 313 is connected to the terminal component 2. Next, the terminal component 2 is placed on the side of the electrode component 3 near the mounting hole 112 so that the electrode component 3 and the terminal component 2 are installed into the housing 11. As the terminal component 2 and the electrode component 3 are installed into the housing 11, the terminal component 2 moves to a position close to the mounting hole 112. At this time, the angle of the terminal component 2 can be adjusted to cover the mounting hole 112. Then, the electrode component 3 is pushed into the housing 11 so that the terminal component 2 can cover the mounting hole 112 from the inside of the first housing wall 111. After that, the terminal component 2 located in the mounting hole 112 is welded to the first housing wall 111 from the outside of the first housing wall 111. In this way, the action of covering the mounting hole 112 with the electrode component 2 is completed simultaneously with the action of inserting the electrode component 3 into the housing, making the operation convenient and improving the processing efficiency.

[0216] Please refer to Figure 38 , Figure 38 This is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; when the cover 12 is the first shell wall 111, after "step S333, connect the adapter structure 22 to the first shell wall 111 from the outside", the following steps may also be included: "step S43, put the shell body 11 on the outside of the electrode component 3" and "step S44, connect the shell body 11 to the cover 12".

[0217] Therefore, by first connecting the electrode post 2 to the cover 12, and then assembling the housing 11 to the cover 12, when connecting the electrode post 2 and the cover 12, since the outer side of the electrode post 3 is not yet covered by the housing 11, it can contact the electrode post 3. By applying force to the electrode post 3, the electrode post 2 can be held against the cover 12. Alternatively, the conductive part 4 can be lengthened to apply force directly to the electrode post 2 from the inside of the cover 12, so that the electrode post 2 is held against the cover 12. This ensures a reliable and effective connection between the electrode post 2 and the cover 12. The method of connecting the housing 11 and the cover 12 is not limited; for example, it can be welding, bonding, etc.

[0218] Please refer to Figures 39-40 , Figure 39 A top view of a battery cell provided in some embodiments of this application; Figure 40 For along Figure 39 A cross-sectional view of the AA line; In some embodiments of this application, the insulating structure 23 is also sealed between the adapter structure 22 and the terminal body 21. Thus, the insulating structure 23 not only insulates the adapter structure 22 from the terminal body 21, but also seals the mating position of the adapter structure 22 and the terminal body 21. This isolates the inside and outside of the housing component 1 after the adapter structure 22 is connected to the first housing wall 111, reducing the risk of electrolyte leakage from the mating position of the adapter structure 22 and the terminal body 21 to the outside of the housing component 1, and reducing the risk of liquids or dust from outside the housing component 1 entering the housing component 1 from the mating position of the adapter structure 22 and the terminal body 21, thereby improving the reliability of the battery cell 102.

[0219] In the above technical solution, since the insulating structure 23 is also sealed between the transition structure 22 and the pole body 21, when the pole component 2 is installed on the first shell wall 111 and the transition structure 22 is connected to the first shell wall 111, there is no need to set a seal between the transition structure 22 and the first shell wall 111. This eliminates the need to apply a large sealing pressure to meet the compression requirements of the seal, thereby reducing the stress on the first shell wall 111 and protecting the shell component 1. This helps to reduce the wall thickness of the shell component 1 and lower material costs. Furthermore, when the first shell wall 111 is the end opposite the shell body 11 and the opening 113, the stress at the connection between the first shell wall 111 and the second shell wall 114, as well as the stress on the second shell wall 114, can be reduced. This helps to ensure the reliability of the shell body 11 and lower the wall thickness and cost of the shell body 11.

[0220] Please refer to Figures 39-40In some embodiments of this application, the insulating structure 23 includes a sealing structure 231. In embodiments of this application, the sealing structure 231 is made of a material that is both sealing and insulating, such as an elastic rubber element. At least a portion of the sealing structure 231 is clamped between the adapter structure 22 and the pole body 21 in the inward or outward direction (e.g., the fifth direction F5) of the first housing wall 111.

[0221] In the embodiments of this application, the directions from the inner side to the outer side of the first shell wall 111, and the directions from the outer side to the inner side of the first shell wall 111, are collectively referred to as "the inner and outer directions of the first shell wall 111 (e.g., the fifth direction F5)". "The inner side of the first shell wall 111" refers to the side of the first shell wall 111 facing the electrode component 3, and "the outer side of the first shell wall 111" refers to the side of the first shell wall 111 away from the electrode component 3.

[0222] The sealing structure 231 includes at least a axial side portion 231a. The side of the axial side portion 231a facing the receiving cavity 13 is the inner side of the axial side portion 231a, and the side of the axial side portion 231a away from the electrode component 3 is the outer side of the axial side portion 231a. One of the transition structure 22 and the electrode body 21 is partially clamped on the outer side of the axial side portion 231a, and the other is partially clamped on the inner side of the axial side portion 231a. Thus, the axial side portion 231a is clamped between the transition structure 22 and the electrode body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111 to achieve an axial seal between the transition structure 22 and the electrode body 21.

[0223] Therefore, by setting at least a portion of the sealing structure 231 to be clamped between the transition structure 22 and the pole body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111, an axial seal is achieved between the transition structure 22 and the pole body 21. This axial seal provides a more reliable sealing effect and improves the leakage problem at the mating position of the transition structure 22 and the pole body 21. Furthermore, by integrating the axial seal (such as the axial side portion 231a) into the pole component, the axial force on the first shell wall 111 can be reduced in the embodiments of this application.

[0224] Please refer to Figures 41-44 , Figure 41 A schematic diagram of the pole post component provided in some embodiments of this application; Figure 42 for Figure 41 A top view of the pole piece shown; Figure 43 For along Figure 42 The view shown is in direction B. Figure 44 For along Figure 42A cross-sectional view along line CC; exemplarily, the sealing structure 231 is circumferentially disposed on the side of the adapter structure 22 facing the pole body 21 (i.e., the inner ring of the adapter structure 22). In the embodiments of this application, since the adapter structure 22 is disposed around the pole body 21 and connected to the first shell wall 111, the side of the adapter structure 22 facing the pole body 21 is the "inner ring 2211 of the adapter structure 22", and the 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 circumferentially disposing the sealing structure 231 on the inner ring of the adapter structure 22, the sealing structure 231 can approach the mating position of the adapter structure 22 and the pole body 21, which is beneficial to sealing the mating position of the adapter structure 22 and the pole body 21 with a shorter path, improving the reliability of the seal, and also helps to reduce the size of the sealing structure 231, reduce the sealing area, make it easier to achieve compression sealing, and make the seal less prone to failure, thus improving the sealing effect.

[0225] Please refer to this again. Figures 41-44 For example, when the insulating structure 23 includes a sealing structure 231, which is sandwiched between the transition structure 22 and the pole body 21 to make the transition structure 22 and the pole body 21 seal together, and the transition structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 111, and the pole body 21 is located at the center of the length of the transition structure 22 and is circular, the force at the connection position between the transition structure 22 and the pole body 21 is uniform, making it easy to control the compression of the sealing structure 231, thereby improving the reliability of the seal between the transition structure 22 and the pole body 21. Moreover, the sealing area is relatively small and is not prone to failure.

[0226] Please refer to Figure 45 , Figure 45 A flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application; and in conjunction with Figures 39-44 In some embodiments of this application, before "step S20a, connecting the electrode component 3 to the electrode body 21", the following step may be included: "step S50, providing the electrode component 2", such that the electrode component 2 includes the electrode body 21, the transition structure 22 and the insulating structure 23, the electrode component 3 is connected to the electrode body 21, the transition structure 22 surrounds the electrode body 21 and is connected to the first shell wall 111, the insulating structure 23 is insulatingly fitted between the transition structure 22 and the electrode body 21, the insulating structure 23 includes a sealing structure 231, the sealing structure 231 is circumferentially disposed on the side of the transition structure 22 facing the electrode body 21, and at least partially clamped between the transition structure 22 and the electrode body 21 in the inward and outward directions of the first shell wall 111.

[0227] Therefore, by processing the electrode component 2 into a form where the transition structure 22 and the electrode body 21 are sealed together by the sealing structure 231 before "step S20a, connecting the electrode component 3 to the electrode body 21", the sealing structure 231 can be used to seal the electrode component 22 to the electrode body 21. In the subsequent "step S30a, placing the electrode component 2 connected to the electrode component 3 at the mounting hole 112 and connecting the transition structure 22 to the first shell wall 111", a sealing element is no longer needed between the transition structure 22 and the first shell wall 111. This eliminates the need to apply significant sealing pressure to meet the compression requirements of the sealing element, thereby reducing the stress on the first shell wall 111. Furthermore, when the first shell wall 111 is the end opposite the opening 113 of the shell body 11, the stress at the connection between the first shell wall 111 and the second shell wall 114, as well as the stress on the second shell wall 114, can be reduced. This helps ensure the reliability of the shell body 11 and reduces the wall thickness and cost of the shell body 11.

[0228] Exemplary, the electrode post component 2 used in the battery cell 102 processed by the assembly method of any of the above embodiments can be in the form of including the sealing structure 231 in this embodiment. For example, as shown in FIG11 (the conductive part 4 of the electrode component 3 first passes through the mounting hole 112, the conductive part 4 is welded to the electrode post component 2 outside the mounting hole 112, and the electrode post component 2 then covers the mounting hole 112 from the outside of the first shell wall 111), or Figure 30A-28 As shown in diagram D (the electrode component 3 and the electrode post component 2 are first welded together, and after the electrode post component 2 passes through the mounting hole 112, the mounting hole 112 is covered from the outside of the first shell wall 111 in an assembly method), or Figure 34A-32 As shown in D (the electrode component 3 and the pole component 2 are welded first, the pole component 2 does not pass through the mounting hole 112, and the mounting hole 112 is covered from the inside of the first shell wall 111), the pole component 2 including the sealing structure 231 in this embodiment can be used.

[0229] Please refer to Figure 44 and Figure 46 , Figure 46This is a flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application. In some embodiments of this application, the terminal body 21 includes a peripheral portion 212, and the adapter structure 22 is clamped on both sides of the peripheral portion 212 in the inward and outward directions of the first shell wall 111 by an insulating structure 23. At least a portion of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the electrode component 3 and the adapter structure 22. "Step S50, providing the terminal component 2" may specifically include: "Step S51, assembling or shaping the adapter structure 22 to complete the clamping of the peripheral portion 212 and the sealing structure 231 by the adapter structure 22." Thus, only the adapter structure 22 needs to be operated on, without operating the terminal body 21, to complete the provision of the terminal component 2, thereby simplifying the operation, making the processing of the terminal component 2 easier, and achieving a simple and effective relative fixation and insulating fit between the terminal body 21 and the adapter structure 22.

[0230] refer to Figure 44 The peripheral portion 212 can be the outer peripheral structure of the pole body 21. Since the sealing structure 231 is arranged around the periphery of the transition structure 22 facing the pole body 21, the sealing structure 231 can be clamped between the peripheral portion 212 and the transition structure 22. The side of the peripheral portion 212 facing away from the electrode component 3 is the outer side of the peripheral portion 212, and the side of the peripheral portion 212 facing the receiving cavity 13 is the inner side of the peripheral portion 212. The transition structure 22 is limited to the outer side of the peripheral portion 212 by the insulating structure 23 to restrict the movement of the electrode body 21 relative to the transition structure 22 in the direction away from the electrode component 3. The transition structure 22 is also limited to the inner side of the peripheral portion 212 by the insulating structure 23 to restrict the movement of the electrode body 21 relative to the transition structure 22 in the direction towards the receiving cavity 13. Thus, the transition structure 22 is clamped on both sides of the peripheral portion 212 by the insulating structure 23 in the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111.

[0231] In the above technical solution, the sealing structure 231 is clamped between the peripheral portion 212 of the electrode body 21 and the transition structure 22. This allows the sealing structure 231 to be positioned at the mating point between the transition structure 22 and the electrode body 21, facilitating a shorter path for sealing the mating point and improving sealing reliability. Furthermore, it reduces the size of the sealing structure 231, decreases the sealing area, and makes compression sealing easier, reducing the likelihood of seal failure and improving sealing performance. Moreover, since at least a portion of the sealing structure 231 is clamped between the peripheral portion 212 facing the electrode component 3 and the transition structure 22, the sealing structure 231 can seal from the peripheral portion 212 facing the receiving cavity 13, more effectively suppressing electrolyte leakage from the mating point between the electrode body 21 and the transition structure 22, thereby improving the sealing effect.

[0232] Please refer to this again. Figure 44 For example, 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 via the first insulating member 232 and the sealing structure member 231. In this embodiment, the configuration of the transition structure 22 is not limited; it can be a single part or a combination of multiple parts (e.g., two or more).

[0233] Since at least a portion of the sealing structure 231 (such as the axial portion 231a) is located on the side of the peripheral portion 212 facing the electrode component 3, at least a portion of the first insulating member 232 is located on the side of the peripheral portion 212 away from the electrode component 3. The transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the first insulating member 232 and the sealing structure 231 respectively.

[0234] In the above technical solution, since the insulation structure 23 includes a first insulating component 232 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulation structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the first insulating component 232 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. In addition, when the first insulating component 232 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0235] Alternatively, in some other embodiments of this application, the sealing structure 231 can also be a single-piece structure with an outer periphery 212, located on the side of the periphery 212 facing the electrode component 3 and the side facing away from the electrode component 3, respectively. The transition structure 22 can be clamped on both sides of the periphery 212 along the inward and outward directions of the first shell wall 111 by the sealing structure 231. That is, the sealing structure 231 is a single-piece annular structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the periphery 212, respectively. In this way, the transition structure 22 can be clamped on both sides of the periphery 212 along the inward and outward directions of the first shell wall 111 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is a single-piece structure with an outer periphery 212, the number of parts and assembly processes can be reduced.

[0236] Please refer to this again. Figure 44In some embodiments of this application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is disposed on the side of the first adapter ring 221 away from the electrode component 3. The second adapter ring 222 is connected to the first adapter ring 221, and the first adapter ring 221 is connected to the first shell wall 111. The sealing structure 231 is sandwiched between the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232.

[0237] For example, the first adapter ring 221 and the second adapter ring 222 can be welded, riveted, drilled, or bonded together. For instance, the first adapter ring 221 can be welded, riveted, drilled, or bonded to the first shell wall 111. Exemplarily, both the first adapter ring 221 and the second adapter ring 222 are made of aluminum and are welded together, and both the first adapter ring 221 and the first shell wall 111 are made of aluminum and are welded together, which helps to improve the welding yield.

[0238] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 that are arranged internally and externally and assembled together, which facilitates the assembly and connection of the adapter structure 22 with the insulation structure 23 and the pole body 21, making the pole component 2 easy to process and manufacture, and making it easy to control the compression of the sealing structure component 231, thereby improving the sealing reliability.

[0239] The method by which the second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232 is not limited.

[0240] For example, please refer to again Figure 44 The first insulating component 232 and the second transition ring 222 can be injection molded separately to insulate the periphery 212. For example, when processing the pole component 2, the pole body 21 and the second transition ring 222 can be injection molded together to obtain the first insulating component 232, and then the sealing structure 231 and the first transition ring 221 can be assembled, and then the first transition ring 221 and the second transition ring 222 can be connected (e.g., welded) to press the sealing structure 231.

[0241] For example, please refer to Figure 47 , Figure 47This is a cross-sectional view of the pole component provided in some embodiments of this application; the second adapter ring 222 may include a stop ring portion 2221, and at least a portion of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111. The material of the first insulating member 232 is not limited, and it may be a plastic part or an elastic rubber part. For example, when processing the pole component 2, the pole body 21, the sealing structure 231 and the first adapter ring 221 can be assembled first, and then the first insulating member 232 and the second adapter ring 222 can be assembled. Then, the first adapter ring 221 and the second adapter ring 222 can be connected (e.g., welded), and the sealing structure 231 can be pressed tightly.

[0242] Please refer to this again. Figure 44 For example, the adapter structure 22 further includes a first insulating frame 224, which is connected to the side of the first adapter ring 221 facing the electrode component 3. Thus, the first insulating frame 224 can serve as insulation between the electrode component 3 and the first adapter ring 221, reducing the difficulty of setting up the insulation structure here. For example, the first insulating frame 224 has a pin, and the first adapter ring 221 has a hole; the pin is interference-fitted into the hole to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0243] Please refer to Figure 48 and Figure 49 , Figure 48 This is a cross-sectional view of the pole member provided in some embodiments of this application. Figure 49 The image shows a cross-sectional view of a pole member provided in some embodiments of this application. In some embodiments of this application, the adapter structure 22 includes a third adapter ring 223, which includes an integrally formed inner extension 2231 and an outer extension 2232. That is, the inner extension 2231 and the outer extension 2232 are different parts of a single integral component, rather than two separate parts that are assembled together.

[0244] The inner extension 2231, facing the pole body 21 (i.e., the inner ring of the inner extension 2231), and the outer extension 2232, facing the pole body 21 (i.e., the inner ring of the outer extension 2232), are spaced apart in the inner and outer directions, respectively, by the insulating structure 23 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111, and clamped on both sides of the peripheral portion 212. The sealing structure 231 is clamped between the inner extension 2231 and the peripheral portion 212, and the outer extension 2232 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232.

[0245] The connection method between the third adapter ring 223 and the first shell wall 111 is not limited; for example, it can be welded, riveted, drilled, or bonded. For example, both the third adapter ring 223 and the first shell wall 111 are made of aluminum and are welded together, which helps to improve the welding yield.

[0246] The way in which the outer extension 2232 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232 is not limited.

[0247] For example, please refer to again Figure 48 The outer extension 2232 rivets and presses the first insulating member 232 against the peripheral portion 212. The material of the first insulating member 232 is not limited; for example, it can be a plastic part or an elastic rubber part. For example, when processing the pole component 2, the pole body 21, the sealing structure 231 and the third adapter ring 223 can be assembled first, and then the outer extension 2232 of the third adapter ring 223 can be riveted, so that the outer extension 2232 rivets and presses the first insulating member 232 against the peripheral portion 212, thus pressing the sealing structure 231 tightly.

[0248] For example, please refer to Figure 49 The first insulating member 232 is injection molded to connect with the pole body 21, and the first insulating member 232 is injection molded to connect with the outer extension 2232. The inner extension 2231 rivets the sealing structure 231 against the peripheral portion 212. For example, when processing the pole component 2, the pole body 21 and the third adapter ring 223 can be injection molded together to obtain the first insulating member 232, and then the sealing structure 231 can be assembled. After that, the outer extension 2232 of the third adapter ring 223 is riveted so that the outer extension 2232 rivets the sealing structure 231 against the peripheral portion 212.

[0249] For example, please refer again Figure 49 The adapter structure 22 also includes a second insulating frame 225, which is connected to the side of the third adapter ring 223 facing the electrode component 3. Thus, the second insulating frame 225 can serve as insulation between the electrode component 3 and the third adapter ring 223, eliminating the need for a separate insulating structure. Exemplarily, the second insulating frame 225 has a pin, and the third adapter ring 223 has a hole; the pin is interference-fitted into the hole to connect the second insulating frame 225 and the third adapter ring 223.

[0250] Please refer to Figure 50 , Figure 50This is an exploded view of the processing of the third adapter ring provided in some embodiments of this application; exemplarily, when the adapter structure 22 includes a third adapter ring 223, and the third adapter ring 223 has an inner extension 2231 and an outer extension 2232, the shaping steps of the adapter structure 22 can be: first, a metal plate is provided, then a convex bulge is stamped out of the metal plate, then the periphery outside the convex bulge is thinned to obtain one of the inner extension 2231 and the outer extension 2232, and then a hole is punched at the position of the convex bulge to obtain the other of the inner extension 2231 and the outer extension 2232.

[0251] Please refer to Figure 51 , Figure 51 This is an exploded view of the manufacturing process of the pole post component provided in some embodiments of this application; exemplarily, when the pole post component 2 is manufactured using the third adapter ring 223, the third adapter ring 223 is manufactured first, for example, referring to... Figure 50 The process involves injection molding the third adapter ring 223 to the pole body 21 to obtain the first insulating component 232. Then, the sealing structure component 231 is assembled, followed by a riveting process to press the inner extension 2231 against the sealing structure component 231. Finally, the second insulating frame 225 is assembled onto the third adapter ring 223. Thus, by shaping the third adapter ring 223, the clamping of the sealing structure component 231 by the peripheral portion 212 and the inner extension 2231 of the adapter structure 22 is completed.

[0252] Please refer to Figure 52 and Figure 53 , Figure 52 A flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application; Figure 53 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application. In some embodiments of this application, the adapter structure 22 includes a mating ring portion 2271, and the terminal body 21 includes a through portion 214 passing through the mating ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the through portion 214 and clamped on the inner and outer sides of the mating ring portion 2271. At least a portion of the sealing structure 231 is clamped between the mating ring portion 2271 and the inner limiting portion 215. "Step S50, providing the terminal component 2" may specifically include: "Step S52, assembling or shaping the terminal body 21 to complete the clamping of the sealing structure 231 by the mating ring portion 2271 and the terminal body 21." Therefore, only the pole body 21 needs to be operated, without operating the adapter structure 22, to complete the provision of the pole component 2, thereby simplifying the operation, making the processing of the pole component 2 easy, and achieving a simple and effective relative fixation and insulating fit between the pole body 21 and the adapter structure 22.

[0253] In the above technical solution, the sealing structure 231 is clamped at the mating position of the electrode body 21 and the mating ring 2271. This allows the sealing structure 231 to be positioned at the mating position of the transition structure 22 and the electrode body 21, facilitating a shorter path for sealing the mating position and improving sealing reliability. Furthermore, it reduces the size of the sealing structure 231, decreases the sealing area, and makes compression sealing easier, reducing the likelihood of seal failure and improving sealing performance. Moreover, since at least a portion of the sealing structure 231 is clamped between the mating ring 2271 and the inner limiting portion 215, the sealing structure 231 can seal from the side of the mating ring 2271 facing the receiving cavity 13, more effectively suppressing electrolyte leakage from the mating position of the electrode body 21 and the transition structure 22, thereby improving the sealing effect.

[0254] refer to Figure 53 The adapter structure 22 includes a fourth adapter ring 227, which includes a mating ring portion 2271 and is connected to the first shell wall 111, for example, the outer ring of the fourth adapter ring 227 is connected to the first shell wall 111. The connection method between the fourth adapter ring 227 and the first shell wall 111 is not limited; for example, it can be welded, riveted, drilled, or bonded. For example, both the fourth adapter ring 227 and the first shell wall 111 are made of aluminum and are welded together, which helps to improve the welding yield.

[0255] Please refer to this again. Figure 53 The insulating structure 23 may further include a second insulating member 234, wherein at least a portion of the sealing structure 231 is clamped between the inner limiting portion 215 and the mating ring portion 2271, and at least a portion of the second insulating member 234 is clamped between the outer limiting portion 216 and the mating ring portion 2271.

[0256] In the above technical solution, since the insulation structure 23 includes a second insulating component 234 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulation structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the second insulating component 234 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. In addition, when the second insulating component 234 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0257] Please combine Figure 54 , Figure 54This is a partial cross-sectional view of a battery cell provided in some embodiments of this application; or, in some other embodiments of this application, the sealing structure 231 may also be an integral structure and surround a mating ring 2271, located on the side of the mating ring 2271 facing the electrode component 3 and the side facing away from the electrode component 3, respectively. The electrode post body 21 is clamped on both sides of the mating ring 2271 by the sealing structure 231 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111. That is, the sealing structure 231 is an integral ring structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the mating ring 2271, respectively. In this way, the transition structure 22 can be clamped on both sides of the mating ring 2271 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure and surrounds the mating ring 2271, the number of parts and assembly steps can be reduced.

[0258] In the embodiments of this application, when the pole body 21 includes a through portion 214, and an inner limiting portion 215 and an outer limiting portion 216 connected to the through portion 214 and clamped on both sides of the mating ring portion 2271, the configuration of the pole body 21 is not limited. It can be a single part or a combination of multiple parts (such as two or more).

[0259] Please refer to this again. Figure 53 For example, the outer limiting part 216 and the through part 214 are assembled and connected on the side of the mating ring part 2271 opposite to the inner limiting part 215. The assembly and connection method of the outer limiting part 216 and the through part 214 is not limited; for example, welding, drilling, adhesive bonding, etc., assembly connection refers to the connection of two parts together through a connection process. Therefore, by setting the outer limiting part 216 and the through part 214 as separate parts and assembling them, the structure of the pole body 21 is simple and easy to assemble and connect with the transition structure 22. Furthermore, when the outer limiting part 216 and the through part 214 are welded, the thermal impact on the sealing structure 231 clamped between the inner limiting part 215 and the mating ring part 227 can be reduced, improving the sealing reliability of the sealing structure 231.

[0260] In the above embodiments, the connection method between the through-hole portion 214 and the inner limiting portion 215 is not limited; they can be an integral part or separate parts pre-connected together. For example, the end of the through-hole portion 214 facing away from the inner limiting portion 215 may include a riveting portion 2141. During assembly, the through-hole portion 214 can be inserted through the mating ring portion 2271 fitted with the insulating structure 23 along the direction from the inner limiting portion 215 to the outer limiting portion 216. Then, the riveting portion 2141 is riveted to restrict the through-hole portion 214 from disengaging along the direction from the outer limiting portion 216 to the inner limiting portion 215. Afterward, the riveting portion 2141 and the outer limiting portion 216 can be connected, facilitating the connection between the through-hole portion 214 and the outer limiting portion 216, for example, by welding. Alternatively, the riveting portion 2141 can be omitted, eliminating the riveting process after the through-hole portion 214 is inserted.

[0261] Please combine Figure 54 and Figure 55 , Figure 55 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application. In some other embodiments of this application, the outer limiting part 216 and the through part 214 are integral, and the outer limiting part 216 rivets the second insulating member 234 against the mating ring part 2271. In the above technical solution, the assembly connection between the outer limiting part 216 and the insulating structure 23 and the transition structure 22 is achieved by riveting, which reduces the thermal impact of the heat generated when the outer limiting part 216 is connected to the insulating structure 23 and the transition structure 22 on the sealing structure member 231, and improves the sealing reliability of the sealing structure member 231. In addition, by riveting the outer limiting part 216 to press the second insulating member 234 against the mating ring part 2271, the compression amount of the sealing structure member 231 can be easily controlled, achieving a better compression effect.

[0262] In the above embodiments, the connection method between the through portion 214 and the inner limiting portion 215 is not limited, and they can be a single piece (e.g., Figure 54 (as shown), or they can be separate components pre-connected (e.g.) Figure 55 (As shown). For example, during assembly, the inserting portion 214 can be inserted along the direction from the inner limiting portion 215 to the outer limiting portion 216, and the mating ring portion 2271 with the insulating structure 23 can be inserted, and then the outer limiting portion 216 can be riveted to restrict the relative movement between the pole member 21 and the adapter structure 22.

[0263] Among them, the pole body 21 is a solid structure (e.g. Figure 53 and Figure 55 As shown), it can also be a hollow structure (e.g. Figure 54 (As shown). For example, please refer to Figure 54When the electrode body 21 is a hollow structure, the electrode body 21 includes a first electrode member 21a and a second electrode member 21b. The second electrode member 21b is composed of a through portion 214, an inner limiting portion 215, and an outer limiting portion 216, and is installed on the first shell wall 111. The through portion 214 surrounds a mating hole 21b1 that extends through the inner and outer directions of the first shell wall 111. The first electrode member 21a is fitted onto the side of the second electrode member 21b away from the electrode component 3 and covers the mating hole 21b1, so as to form an accommodating space open towards the electrode component 3 between the first electrode member 21a and the second electrode member 21b. A portion of the conductive part 4 can extend into the accommodating space and connect to the first electrode member 21a. Thus, the electrode body 21 can serve to accommodate the conductive part 4, thereby reducing the space occupied by the conductive part 4 in the accommodating cavity 13 and improving the energy density of the battery cell 102.

[0264] Please refer to this again. Figure 53 In some embodiments of this application, the adapter structure 22 further includes a third insulating frame 228, which is connected to the side of the fourth adapter ring 227 facing the electrode component 3. Thus, the third insulating frame 228 can serve as insulation between the electrode component 3 and the fourth adapter ring 227, eliminating the need for a separate insulating structure. Exemplarily, the third insulating frame 228 has a pin, and the fourth adapter ring 227 has a socket; the pin is interference-fitted into the socket to connect the third insulating frame 228 and the fourth adapter ring 227.

[0265] Please combine Figure 56 and Figure 57 , Figure 56 A flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application; Figure 57 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application; the first shell wall 111 has a mounting hole 112, and a sealing ring 14 is provided around the mounting hole 112, the sealing ring 14 is clamped between the electrode post 2 and the first shell wall 111; "Step S30a, setting the electrode post 2 connected to the electrode post 3 at the mounting hole 112, and connecting the adapter structure 22 to the first shell wall 111" may specifically include the steps: "Step S34, installing the sealing ring 14 at the mounting hole 112 of the first shell wall 111"; "Step S35, covering the mounting hole 112 with the electrode post 2 connected to the electrode post 3, so that the sealing ring 14 is clamped between the electrode post 2 and the first shell wall 111".

[0266] When the electrode post 2, connected to the electrode post 3, is placed over the mounting hole 112 so that the sealing ring 14 is sandwiched between the electrode post 2 and the first housing wall 111, the edge of the transition structure 22 overlaps one side of the first housing wall 111 in the wall thickness direction. Thus, by placing the transition structure 22 over one side of the first housing wall 111 in the wall thickness direction—that is, placing the transition structure 22 over the outside of the first housing wall 111 or over the inside of the first housing wall 111—it is convenient to assemble the transition structure 22 with the first housing wall 111. Therefore, the electrode post 2 has a simple structure, is easy to manufacture, and is easy to assemble and connect with the first housing wall 111.

[0267] For example, the adapter structure 22 is welded to the first shell wall 111. For instance, after the adapter structure 22 is placed over the first shell wall 111, the adapter structure 22 and the first shell wall 111 can be connected by welding, which facilitates processing and ensures a reliable connection between the adapter structure 22 and the first shell wall 111. For example, welding can be performed from the outside of the first shell wall 111, so that the weld seam formed by the connection is exposed on the side of the first shell wall 111 away from the electrode component 3 (i.e., the side away from the active material coating portion 32), thereby facilitating welding operations and increasing the welding space.

[0268] The execution order of "step S34, installing the sealing ring 14 into the mounting hole 112 of the first shell wall 111" can be flexibly set. It can be set before or after the conductive part 4 or the electrode component 2 passes through the mounting hole 112. When the electrode component 2 needs to pass through the mounting hole (for example, as shown in Figure 23), the execution order of "step S20a, connecting the electrode component 3 to the electrode body 21" and "step S34, installing the sealing ring 14 into the mounting hole 112 of the first shell wall 111" is not limited. They can be performed one after the other or simultaneously.

[0269] Referring to Figure 10, in some embodiments, the phrase "step S35, covering the mounting hole 112 with the electrode post 2 connected to the electrode post 3 so that the sealing ring 14 is sandwiched between the electrode post 2 and the first housing wall 111" can specifically be: "step S311, covering the mounting hole 112 with the electrode post 2 connected to the conductive part 4 from the outside of the first housing wall 111 so that the adapter structure 22 abuts against the outside of the first housing wall 111". For example, referring to FIG10, when assembling the battery cell 102, the following steps can be performed sequentially: "Step S34, install the sealing ring 14 into the mounting hole 112 of the first housing wall 111"; "Step S211, place the electrode component 3 and the conductive part 4 connected to the electrode component 3 on the inner side of the first housing wall 111, and extend the conductive part 4 through the mounting hole 112 to the outer side of the first housing wall 111"; "Step S212, extend the conductive part 4 through the mounting hole 112 to the outer side of the first housing wall 111"; "Part 4 is connected to the pole body 21 of the pole member 2 located on the outside of the first shell wall 111"; "Step S311, the pole member 2 connected to the conductive part 4 is covered by the mounting hole 112 from the outside of the first shell wall 111 so that the adapter structure 22 abuts against the outside of the first shell wall 111", and the sealing ring 14 is sandwiched between the pole member 2 and the first shell wall 111; "Step S312, the adapter structure 22 is connected to the first shell wall 111 from the outside of the first shell wall 111".

[0270] Alternatively, referring to Figure 23, in some embodiments, the phrase "step S35, covering the mounting hole 112 with the pole member 2 connected to the electrode member 3 so that the sealing ring 14 is sandwiched between the pole member 2 and the first shell wall 111" can specifically be: "step S322, covering the mounting hole 112 with the pole member 2 that extends to the outside of the first shell wall 111 from the outside of the first shell wall 111 so that the transition structure 22 abuts against the outside of the first shell wall 111." For example, referring to FIG23, when assembling the battery cell 102, the following steps can be performed sequentially: "Step S20a, connect the electrode component 3 to the terminal body 21"; "Step S34, install the sealing ring 14 at the mounting hole 112 of the first shell wall 111"; "Step S321, pass the terminal component 2 connected to the electrode component 3 from the inside of the first shell wall 111 through the mounting hole 112 to the outside of the first shell wall 111"; "Step S322, cover the mounting hole 112 with the terminal component 2 that has passed to the outside of the first shell wall 111 from the outside of the first shell wall 111, so that the adapter structure 22 abuts against the outside of the first shell wall 111", and the sealing ring 14 is sandwiched between the terminal component 2 and the first shell wall 111; "Step S323, connect the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111".

[0271] Alternatively, in some embodiments, the phrase "the pole member 2 connected to the electrode member 3 is covered in the mounting hole 112 in step S35, so that the sealing ring 14 is sandwiched between the pole member 2 and the first shell wall 111" can be specifically described as: "Step S332, the pole member 2 connected to the electrode member 3 is covered in the mounting hole 112 from the inside of the first shell wall 111 so that the adapter structure 22 abuts against the inside of the first shell wall 111".

[0272] In some embodiments of this application, combined with Figure 4 and Figure 5 The transition structure 22 is formed as an elongated strip (e.g., rectangular, elliptical, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111. The pole body 21 is located at the center of the length of the transition structure 22 and is circular. Therefore, when the pole body 21 is located at the center of the length of the elongated transition structure 22 and is circular, it is beneficial to reduce the connection area between the pole body 21 and the transition structure 22, and to make the connection force between the pole body 21 and the transition structure 22 evenly distributed on the circumference, thereby improving the uniformity of the force at the connection between the pole body 21 and the transition structure 22, and thus improving the connection reliability between the pole body 21 and the transition structure 22.

[0273] In other embodiments of this application, combined with Figure 39 and Figure 40 The adapter structure 22 is formed as an elongated strip (e.g., rectangular, elliptical, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111. The outline shape of the electrode body 21 matches the outline shape of the adapter structure 22 (e.g., rectangular, elliptical, racetrack-shaped, etc.). The electrode component 3 is connected to the electrode component 2 via the conductive part 4. When the outline shape of the electrode body 21 is formed as an elongated strip that matches the outline shape of the adapter structure 22, the area of ​​the electrode body 21 is larger, which is beneficial to increasing the connection area between the conductive part 4 and the electrode body 21, thereby improving the charging performance.

[0274] In some embodiments of this application, combined with Figure 58 , Figure 58 This is a flowchart illustrating the assembly method of a battery cell provided in some embodiments of this application. Before "step S20a, connecting the electrode component 3 to the terminal body 21," the method further includes: step S53, providing the terminal body 21 and the adapter structure 22; and step S54, assembling the terminal component 2. That is, the desired terminal body 21 and adapter structure 22 are provided, and then the terminal body 21, adapter structure 22, and insulation structure 23 are assembled together to obtain the terminal component 2.

[0275] For example, when the insulating structure 23 includes the sealing structure 231, "step S50, providing the pole component 2" may include: step S53, providing the pole body 21 and the transition structure 22; step S54, assembling the pole component 2. Specifically, "step S54, assembling the pole component 2" may be: "step S51, assembling or shaping the transition structure 22 to complete the clamping of the sealing structure 231 by the peripheral portion 212 and the transition structure 22"; or, "step S54, assembling the pole component 2" may also be specifically "step S52, assembling or shaping the pole body 21 to complete the clamping of the sealing structure 231 by the mating ring portion 2271 and the pole body 21".

[0276] For example, in "step S311, the electrode post component 2 connected to the conductive part 4 is covered from the outside of the first shell wall 111 onto the mounting hole 112, so that the adapter structure 22 abuts against the outside of the first shell wall 111"; "step S312, the adapter structure 22 is connected to the first shell wall 111 from the outside of the first shell wall 111"; and in "step S321, the electrode post component 2 connected to the electrode component 3 is passed from the inside of the first shell wall 111 through the mounting hole 112 to the first..." "Outer side of shell wall 111"; "Step S322, cover the mounting hole 112 with the electrode post component 2 that protrudes to the outer side of the first shell wall 111 from the outer side of the first shell wall 111, so that the adapter structure 22 abuts against the outer side of the first shell wall 111"; "Step S323, connect the adapter structure 22 to the first shell wall 111 from the outer side of the first shell wall 111", in which the edges of the adapter structure 22 can overlap the side of the first shell wall 111 away from the electrode component 3, for example, refer to Figure 11A-11D as well as Figure 30A-30D A first recess 1111 can be provided on the first shell wall 111, surrounding the mounting hole 112. The first recess 1111 opens in the direction away from the electrode component 3 (that is, the first recess 1111 opens in the direction away from the active material coating part 32). The edge of the adapter structure 22 is embedded in the first recess 1111, wherein the edge of the adapter structure 22 has a flange 22a surrounding the adapter structure 22, and the flange 22a is embedded in the first recess 1111. This facilitates the support and positioning of the connection between the adapter structure 22 and the first shell wall 111, and is beneficial for welding the two together from the outside of the first shell wall 111 (that is, the side away from the active material coating part 32).

[0277] For example, the thickness of the flange portion 22a matches the groove depth T1 of the first groove 1111, where "matching" means that the thickness of the flange portion 22a and the groove depth of the first groove 1111 are substantially the same. This facilitates welding of the flange portion 22a to the first shell wall 111. The thickness of the flange portion 22a is not too large relative to the groove depth of the first groove 1111, reducing unnecessary space occupation, and the thickness of the flange portion 22a is not too small relative to the groove depth of the first groove 1111, thus meeting welding strength requirements.

[0278] For example, in "step S331, placing both the electrode post 2 connected to the electrode component 3 and the electrode component 3 inside the first shell wall 111"; "step S332, covering the mounting hole 112 from the inside of the first shell wall 111 with the electrode post 2 connected to the electrode component 3, so that the adapter structure 22 abuts against the inside of the first shell wall 111"; "step S333, connecting the adapter structure 22 to the first shell wall 111 from the outside of the first shell wall 111", the edge of the adapter structure 22 overlaps the side of the first shell wall 111 facing the electrode component 3. Please refer again to... Figure 34A-32 D. The edge of the adapter structure 22 has a second recess 22b that opens towards the direction away from the electrode component 3 (that is, the second recess 22b opens towards the direction away from the active material coating portion 32). The first shell wall 111 includes an overlapping portion 1112 protruding into the mounting hole 112, and the overlapping portion 1112 is embedded in the second recess 22b. This facilitates the support and positioning of the connection between the electrode component 2 and the first shell wall 111, and is beneficial for welding the two together from the outside of the first shell wall 111 (that is, the side away from the active material coating portion 32).

[0279] For example, the thickness of the overlapping portion 1112 matches the groove depth T2 of the second sinker 22b, where "matching" means that the thickness of the overlapping portion 1112 and the groove depth of the second sinker 22b are substantially the same. This facilitates welding the overlapping portion 1112 to the first shell wall 111. The thickness of the overlapping portion 1112 is not too large relative to the groove depth of the second sinker 22b, reducing unnecessary space occupation, and the thickness of the overlapping portion 1112 is not too small relative to the groove depth of the second sinker 22b, thus meeting the welding strength requirements.

[0280] In other embodiments of this application, please refer to Figure 59 , Figure 60A-60D , Figure 59 A flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application; Figure 60A-60DThis is an exploded view of the assembly process of a battery cell according to an embodiment of this application; the terminal body 21 includes a first terminal member 21a and a second terminal member 21b, the second terminal member 21b is mounted on the first housing wall 111, the first terminal member 21a is mounted on the second terminal member 21b, and the electrode component 3 is connected to the first terminal member 21a. "Step S20, connecting the electrode component 3 to the terminal member 2" specifically includes: "Step S20b, connecting the electrode component 3 to the first terminal member 21a"; "Step S30, installing the terminal member 2 connected to the electrode component 3 to the first housing wall 111" specifically includes: "Step S30b, assembling the first terminal member 21a connected to the electrode component 3 to the second terminal member 21b mounted on the first housing wall 111".

[0281] In the above technical solution, by dividing the electrode body 21 into two parts for assembly and connection, when assembling the battery cell, the first electrode 21a can be connected to the electrode component 3 first, and the second electrode 21b can be connected to the first shell wall 111 first, and then the first electrode 21a and the second electrode 21b can be connected. This helps to shorten the conductive part 4, reduce the redundancy of the conductive part 4 and the material cost.

[0282] Please refer to Figure 60 again, and combine it with... Figure 61 , Figure 61 This is a flowchart illustrating the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, the second electrode post 21b defines a mating hole 21b1, and the first electrode post 21a covers the side of the second electrode post 21b opposite to the electrode component 3 and seals the mating hole 21b1. The step "step S30b, assembling the first electrode post 21a connected to the electrode component 3 to the second electrode post 21b installed on the first housing wall 111" may specifically include: "step S30b21, covering the mating hole 21b1 from the outside of the second electrode post 21b with the first electrode post 21a connected to the electrode component 3", and "step S30b22, connecting the first electrode post 21a from the outside of the first housing wall 111 to the second electrode post 21b".

[0283] In the above technical solution, by setting the mating hole 21b1, the first pole piece 21a and the second pole piece 21b can be connected from the outside of the pole piece 2, which is beneficial to improving the connection convenience and connection reliability of the first pole piece 21a and the second pole piece 21b.

[0284] Please refer to Figure 60 again, and combine it with... Figure 62 , Figure 62The following is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; in some embodiments of this application, "step S20b, connecting the electrode component 3 with the first electrode post 21a" may specifically include: "step S20b11, placing the electrode component 3 and the conductive part 4 on the inner side of the first shell wall 111, and passing the conductive part 4 through the mating hole 21b1 to the outer side of the second electrode post 21b"; "step S20b12, connecting the conductive part 4 that passes through the outer side of the first shell wall 111 with the first electrode post 21a placed on the outer side of the first shell wall 111".

[0285] That is, when processing the above-mentioned battery cell 102, the following steps can be performed sequentially: Step S20b11, placing the electrode component 3 and the conductive part 4 inside the first shell wall 111, and passing the conductive part 4 through the mating hole 21b1 to the outside of the second electrode post 21b; Step S20b12, connecting the conductive part 4 that passes through the outside of the first shell wall 111 to the first electrode post 21a placed on the outside of the first shell wall 111; Step S30b21, covering the mating hole 21b1 with the first electrode post 21a connected to the electrode component 3 from the outside of the second electrode post 21b; Step S30b22, connecting the first electrode post 21a from the outside of the first shell wall 111 to the second electrode post 21b.

[0286] In the above technical solution, since the conductive part 4 is not yet connected to the first electrode post 21a when it passes through the mating hole 21b1, it is convenient for the conductive part 4 to pass through the mating hole 21b1, thus improving the ease of operation. Moreover, since the welding position between the first electrode post 21a and the conductive part 4 is located on the outside of the first shell wall 111, the problem of conductive debris formed during the welding process entering the interior of the shell 11 and damaging the electrode component 3 can be improved.

[0287] In the above embodiments, the first shell wall 111 can be either the shell cover 12 or a part of the shell body 11. The specific assembly sequence can be referred to the above description. For example, when the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, the above description can be used as a reference. Figure 17 The settings for the corresponding steps S2111 and S2112, for example, when the shell cover 12 is the first shell wall 111, can be referred to the above. Figure 19-21 The corresponding steps S41, S42, S43, and S44 are set.

[0288] Please refer to Figure 63 , Figure 64A-64D , Figure 63 A flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application; Figure 64A-64DThis is an exploded view of the assembly process of a battery cell provided in one embodiment of this application; in some embodiments of this application, before "step S30b21, covering the mating hole 21b1 with the first electrode post 21a connected to the electrode component 3 from the outside of the second electrode post 21b", the method further includes: "step S30b11, placing the electrode component 3 and the first electrode post 21a connected to the electrode component 3 on the inside of the first shell wall 111"; "step S30b12, passing the first electrode post 21a through the mating hole 21b1 to the outside of the second electrode post 21b".

[0289] That is, when processing the above-mentioned battery cell 102, the following steps can be performed sequentially: Step S20b, connecting the electrode component 3 to the first terminal 21a; Step S30b11, placing the electrode component 3 and the first terminal 21a connected to the electrode component 3 inside the first shell wall 111; Step S30b12, passing the first terminal 21a through the mating hole 21b1 to the outside of the second terminal 21b; Step S30b21, covering the mating hole 21b1 with the first terminal 21a connected to the electrode component 3 from the outside of the second terminal 21b; Step S30b22, connecting the first terminal 21a from the outside of the first shell wall 111 to the second terminal 21b.

[0290] In the above technical solution, since the electrode component 3 is connected to the first terminal post 21a first, and then the first terminal post 21a is passed through the mating hole 21b1, there is no need to consider avoiding the first shell wall 111 when connecting the electrode component 3 and the first terminal post 21a. In other words, when connecting the electrode component 3 and the first terminal post 21a, the second terminal post 21b and the electrode component 3 are not located on opposite sides of the first shell wall 111. This helps to further shorten the length of the conductive part 4, reduce the redundancy of the conductive part 4 after assembly, reduce the risk of reverse insertion, and improve the reliability of the battery cell 102. Moreover, since the welding position of the electrode component 3 and the first terminal post 21a is located on the outside of the shell 11, the problem of conductive debris formed during the welding process entering the interior of the shell 11 and damaging the electrode component 3 can be improved.

[0291] In the above embodiments, the first shell wall 111 can be either the shell cover 12 or a part of the shell body 11. The specific assembly sequence can be referred to the above description. For example, when the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, the above description can be used as a reference. Figure 29 The settings for the corresponding steps S3211 and S3212, for example, when the shell cover 12 is the first shell wall 111, can be referred to the above. Figure 32 and Figure 33 The corresponding steps S43 and S44 are set.

[0292] The execution order of "installing the second electrode post 21b onto the first housing wall 111" can be flexibly set. It can be set before or after the conductive part 4 or the first electrode post 21a through the mating hole 21b1. When the first electrode post 21a needs to pass through the mating hole 21b1 (for example, as shown in Figure 64), the execution order of "connecting the electrode component 3 to the first electrode post 21a" and "installing the second electrode post 21b onto the first housing wall 111" is not limited; they can be performed one after the other or simultaneously.

[0293] Referring again to Figure 60, the first shell wall 111 has a mounting hole 112. The second pole piece 21b passes through the mounting hole 112 and is clamped on both the inner and outer sides of the first shell wall 111. An insulating sealing component 24 is provided between the second pole piece 21b and the first shell wall 111. Therefore, the connection between the second pole piece 21b and the first shell wall 111 is relatively reliable. Furthermore, by providing the insulating sealing component 24, the connection between the second pole piece 21b and the first shell wall 111 is both insulated and sealed. The second pole piece 21b can be made of metal, which helps to increase the conductive area of ​​the pole body 21. For example, the second pole piece 21b can be riveted to the first shell wall 111, thereby eliminating the welding process, improving processing efficiency, and avoiding the impact of welding heat on the insulating sealing component 24. The composition of the insulating sealing component 24 is not limited; for example, it can be a single part or composed of multiple parts, such as elastic rubber parts, plastic parts, etc. In other embodiments of this application, the second pole piece 21b may be configured as a multi-part welded assembly, or the second pole piece 21b may be made of a non-metallic material and connected to the first shell wall 111 by means of bonding, injection molding, etc.

[0294] Please combine Figure 65 , Figure 66A-66C , Figure 65 A flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application; Figure 66A-66C This is an exploded view of the manufacturing process of an electrode component provided in one embodiment of this application. In some embodiments of this application, the tab 33 of the electrode component 3 includes a gathered portion 313 formed by stacking and connecting multiple layers of tabs 311. The tab 33 is connected to the pole component 2 through the gathered portion 313, so that the conductive part 4 only includes the tab 33. The tab 33 is directly connected to the pole component 2. In this case, before "step S20, connecting the electrode component 3 to the pole component 2", the process may include: step S14 stacking and connecting multiple layers of tabs 311 in the tab 33 of the electrode component 3 to form the gathered portion 313.

[0295] When the tab 33 is directly connected to the pole post component 2 via the retracting portion 313, the assembly sequence for any of the above embodiments is suitable, for example... Figure 10A-10D As shown (the conductive part 4 of the electrode component 3 first passes through the mounting hole 112, the conductive part 4 is welded to the electrode component 2 outside the mounting hole 112, and the electrode component 2 then covers the mounting hole 112 from the outside of the first shell wall 111), or Figure 23A-23D As shown (the assembly method in which electrode component 3 and electrode post component 2 are first welded together, and after electrode post component 2 passes through mounting hole 112, mounting hole 112 is covered from the outside of the first shell wall 111), or Figure 34A-34D The electrode component 3 and the pole component 2 are first welded together. The pole component 2 does not pass through the mounting hole 112 and the mounting hole 112 is covered from the inside of the first shell wall 111.

[0296] Exemplarily, the electrode component 3 includes one or more electrode assemblies 31. Each electrode assembly 31 has a positive electrode tab 311 and a negative electrode tab 311. Multiple layers of tabs 311 of the same polarity are stacked and brought together to form a stacked portion 312. The multiple layers of tabs 311 in the stacked portion 312 are connected to form a gathered portion 313. The multiple layers of tabs 311 in the gathered portion 313 are electrically conductive; that is, the multiple layers of tabs 311 in the gathered portion 313 not only have a stacked arrangement but are also connected and conductive. The connection method of the multiple layers of tabs 311 in the gathered portion 313 is not limited. For example, it can be welding such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure welding, or brazing, or through-hole connection, or bonding with conductive adhesive. Exemplarily, the multiple layers of tabs 311 of the same polarity can be ultrasonically welded, and the resulting ultrasonic weld mark is the gathered portion 313.

[0297] The multiple layers of tabs 311 in the gathering portion 313 can belong to the same electrode assembly 31 or to different electrode assemblies 31. That is, several layers of tabs 311 of the same polarity in the same electrode assembly 31 can be connected to form the gathering portion 313, or several layers of tabs 311 of the same polarity in different electrode assemblies 31 can be connected to form the gathering portion 313. For example, all the tabs 311 of the same polarity in the electrode component 3 can be connected to form the gathering portion 313, which can reduce the number of gathering portions 313.

[0298] Therefore, by connecting multiple layers of tabs 311 in the tab portion 33 to form a gathered portion 313, the gathered portion 313 can present a plate shape with multiple layers of tabs 311 connected together and having a certain rigidity, rather than a loose and scattered multi-layer foil shape. This facilitates the perforation operation of the tab portion 33, such as the operation of passing the tab portion 33 through the mounting hole 112 or mating hole 21b1, improving processing efficiency. On the other hand, it makes the welding of the gathered portion 313 and the pole piece 2 (such as the pole piece body 21 or the first pole piece 21a) more reliable, and it is not easy for pores to form in the weld. This can improve the connection reliability and conductivity of the weld, making the conductivity of the electrode piece 3 and the pole piece 2 more stable and reliable.

[0299] Please refer to this again. Figure 66A-66C and combined Figure 67 , Figure 67 This is a flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application. In some embodiments, when the electrode component 3 includes multiple electrode assemblies 31, "step S14 connecting the multiple layers of tabs 311 in the tab portion 33 of the electrode component 3 to form a closing portion 313" specifically includes: step S141 stacking multiple electrode assemblies 31 along the thickness direction of the electrode assembly 31; step S142 connecting the multiple layers of tabs 311 of at least two electrode assemblies 31 to form a closing portion 313. Since multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31, the stacking direction of the electrode assemblies 31 (e.g., ...) is... Figure 66A The fourth direction F4 shown is consistent with the thickness direction of the electrode assembly 31.

[0300] In the above technical solution, before connecting the electrode component 3 and the electrode post component 2, multiple electrode components 31 are stacked first, and several tabs 311 of the same polarity of multiple electrode components 31 are connected together to form a gathering part 313. Compared with the technical solution of connecting the tabs 311 of each electrode component 31 separately to form a gathering part 313, connecting the gathering part 313 of each electrode component 31 separately to the electrode post component 2, and then stacking multiple electrode components 31, on the one hand, the total number of gathering parts 313 can be reduced, the connection steps between the gathering part 313 and the electrode post body 21 can be reduced, and the processing efficiency can be improved. On the other hand, it can avoid the problem of cracking at the connection position between the tab 33 and the active material coating part 32 caused by the asynchronous movement of the tabs 311 of different electrode components 31 when the gathering part 313 is manufactured first and then the electrode components 31 are stacked.

[0301] When the electrode component 3 includes a gathering portion 313 formed by connecting multiple layers of electrode tabs 311 (regardless of whether steps S141 and S142 are performed beforehand, i.e., the multiple layers of electrode tabs 311 in the gathering portion 313 can belong to one electrode assembly 31 or multiple electrode assemblies 31 at the same time), please refer to Figure 68 , Figure 68 This is a flowchart illustrating the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, "step S20, connecting the electrode component 3 to the terminal component 2" may specifically include: step S243, laying the gathering portion 313 on the inner end face 211 of the terminal body 21; step S244, connecting the gathering portion 313 to the inner end face 211 of the terminal body 21. The surface of the terminal body 21 facing the electrode component 3 (i.e., facing the active material coating portion 32) is the inner end face 211 of the terminal body 21.

[0302] In the above technical solution, by laying the folding part 313 on the inner end face 211 of the pole body 21, the folding part 313 is laid flat and flat. At least part of the folding part 313 falls on the inner end face 211 of the pole body 21, so that the tab part 33 will not be damaged due to bending of the folding part 313, thus improving the charging performance. It also facilitates the setting of the welding nozzle and improves the connection reliability between the folding part 313 and the pole body 21.

[0303] For example, please combine again Figure 39 and Figure 40 When the inner end face 211 of the pole body 21 is large, for example, if the inner end face 211 of the pole body 21 is elongated, such as rectangular, elliptical, or racetrack-shaped, the gathering part 313 can be completely laid flat on the inner end face 211 of the pole body 21. Or, for example, please refer to Figure 47 When the inner end face 211 of the pole body 21 is small, the position of the inner end face 220 of the adapter structure 22 adjacent to the pole body 21 is the surrounding area 2201 of the pole body 21. The surrounding area 2201 can be set to be flush with the inner end face 211 of the pole body 21. At this time, a part of the gathering part 313 can be laid flat on the inner end face 211 of the pole body 21, and the rest can be laid flat on the surrounding area 2201, so that the gathering part 313 (for example, the gathering part 313 is also long strip) can be supported as a whole, which is convenient for the welding nozzle to be pressed, so that the gathering part 313 can be reliably connected to the pole body 21.

[0304] In some embodiments of this application, please refer again to Figure 6The electrode post component 2 forms a receiving groove 5 that is recessed relative to the first shell wall 111 in the direction away from the electrode component 3 and open in the direction towards the electrode component 3. The electrode component 3 is connected to the electrode post component 2 via a conductive part 4. At least a portion of the conductive part 4 is accommodated in the receiving groove 5 and connected to the electrode post body 21. That is, the electrode post component 2 forms the receiving groove 5, the groove wall of the receiving groove 5 is formed by the electrode post component 2, the receiving groove 5 is recessed in the direction away from the active material coating part 32, and the receiving groove 5 is open in the direction towards the active material coating part 32, so that the receiving groove 5 communicates with the receiving cavity 13.

[0305] Therefore, by providing a receiving groove 5 to accommodate the conductive part 4, the space occupied by the conductive part 4 in the receiving cavity 13 can be reduced, allowing the receiving cavity 13 to have a larger space to accommodate the active material coating part 32. This is beneficial for increasing the volume of the active material coating part 32, thereby increasing the energy density of the battery cell 102. Moreover, since the receiving groove 5 is open towards the electrode component 13, the conductive part 4 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0306] For example, please refer again Figure 6 When the electrode post component 2 is constructed in any of the above embodiments including the electrode post body 21 and the adapter structure 22, the receiving groove 5 is formed on the side of the electrode post body 21 and the adapter structure 22 facing the electrode component 3 (i.e. the side facing the active material coating portion 32). The adapter structure 22 can be raised relative to the first shell wall 111 in the direction away from the electrode component 3 (i.e. the direction away from the active material coating portion 32), so that the receiving groove 5 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3.

[0307] Therefore, by processing the adapter structure 22 into an outwardly protruding shape, a portion of the receiving groove 5 is formed on the side of the pole body 21 facing the electrode component 3, and another portion of the receiving groove 5 is formed on the side of the adapter structure 22 facing the electrode component 3. The receiving groove 5 has a shape that is concave relative to the first shell wall 111 in the direction away from the electrode component 3. Thus, both the side of the pole body 21 facing the electrode component 3 and the side of the adapter structure 22 facing the electrode component 3 have space to accommodate the conductive part 4. This not only facilitates the storage of the conductive part 4 to a greater extent, but also facilitates the design of diverse forms of the conductive part 4.

[0308] In other embodiments of this application, referring to FIG10, when the adapter structure 22 does not bulge relative to the first shell wall 111 in a direction away from the electrode component 3 (i.e., away from the active material coating portion 32), the height difference between the adapter structure 22 and the electrode post body 21 can define a receiving groove 5 that is recessed relative to the first shell wall 111 in a direction away from the electrode component 3. Alternatively, in conjunction with Figure 54The receiving groove 5 can also be defined by the first pole piece 21a and the second pole piece 21b.

[0309] In some embodiments of this application, please refer again to Figure 6 The surface of the electrode body 21 facing the electrode component 3 is the inner end face 211 of the electrode body 21. The inner end face 211 of the electrode body 21 helps to form the receiving groove 5, and the conductive part 4 is connected to the inner end face 211 of the electrode body 21. That is, at least a portion of the inner end face 211 of the electrode body 21 helps to define the groove wall of the receiving groove 5, and the conductive part 4 is connected to the portion of the inner end face 211 of the electrode body 21 that serves as the groove wall of the receiving groove 5. In the above technical solution, at least a portion of the receiving groove 5 is formed by the side surface of the electrode body 21 facing the electrode component 3, and the conductive part 4 housed in the receiving groove 5 can easily contact and connect to the electrode body 21, improving connection convenience and simplifying the structure. For example, combined with Figure 54 When the electrode body 21 includes a first electrode member 21a and a second electrode member 21b, the surface of the first electrode member 21a facing the electrode component 3 is the inner end face 211 of the electrode body 21.

[0310] Please refer to this again. Figure 39-40 and combined Figure 69 , Figure 69 The flowchart illustrates the steps of assembling a battery cell according to some embodiments of this application. When the terminal post 2 forms a receiving groove 5 that is recessed relative to the first shell wall 111 in the direction away from the electrode post 3 and open in the direction towards the electrode post 3, in some embodiments of this application, before "step S243 laying the gathering part 313 on the inner end face 211 of the terminal post body 21", the following steps may be included: step S242, inserting the gathering part 313 into the receiving groove 5.

[0311] Therefore, by providing a receiving groove 5 to accommodate the gathering part 313, the space occupied by the tab part 33 in the receiving cavity 13 can be reduced, so that the receiving cavity 13 has a larger space to accommodate the active material coating part 32, which is beneficial to increase the volume of the active material coating part 32, thereby increasing the energy density of the battery cell 102.

[0312] Please refer to this again. Figure 23A-23D and combined Figure 70 , Figure 70The flowchart illustrates the steps of a battery cell assembly method provided in some embodiments of this application. When the electrode component 3 includes multiple stacked electrode assemblies 31, in some embodiments of this application, before "step S243 laying the gathering portion 313 on the inner end face 211 of the electrode post body 21", the method may further include: step S2411, placing the electrode post component 2 on one side of the protruding electrode tab 33 of the electrode component 3; step S2412, adjusting the angle of the electrode post component 2 so that the normal of the inner end face 211 of the electrode post body 21 is close to the stacking direction of the multiple electrode assemblies 31 (e.g., ...). Figure 23B (F4 shown in the diagram). In this embodiment, the stacking step of the electrode assembly 31 can be performed before connecting the gathering portion 313 to the electrode post component 2, or after connecting the gathering portion 313 to the electrode post component 2. That is, the gathering portion 313 can be formed by stacking and connecting the multilayer tabs 311 of at least two electrode assemblies 31, or it can be formed by stacking and connecting the multilayer tabs 311 of only one electrode assembly 31.

[0313] The phrase "the normal of the inner end face 211 of the electrode post body 21 is close to the stacking direction of the multiple electrode components 31" means that the normal of the inner end face 211 of the electrode post body 21 is consistent with or substantially consistent with the stacking direction of the multiple electrode components 31. "Substantially consistent" can be understood as a small angle between them, for example, less than 10°. The phrase "setting the electrode post component 2 on one side of the protruding tab 33 of the electrode component 3" can be understood as: the tab 33 is located on one side of the active material coating portion 32. Setting the electrode post component 2 and the tab 33 on the same side of the active material coating portion 32 helps to shorten the length of the tab 33. In the above technical solution, the "length of the tab 33" ensures that when the normal of the inner end face 211 of the electrode post body 21 is close to the stacking direction of the multiple electrode components 31, the electrode post component 2 can be located on one side of the protruding tab 33 of the electrode component 3, and the closing portion 313 can be laid on the inner end face 211 of the electrode post body 21.

[0314] In the above technical solution, by first adjusting the position and angle of the pole piece 2 so that the normal of the inner end face 211 of the pole piece body 21 is close to the stacking direction of the multiple electrode components 31, and then laying the gathering part 313 on the inner end face 211 of the pole piece body 21, there is no need to adjust the angle of the pole piece body 21. This allows sufficient space near the mating position of the gathering part 313 and the inner end face 211 of the pole piece body 21 for welding operations, thereby simplifying the operation. Moreover, this allows the length of the electrode tab 33 to be shorter.

[0315] Please refer to this again. Figure 23A-23D and combined Figure 70For example, when the electrode post component 2 has a receiving groove 5, the following steps can be performed first: "Step S2411: Set the electrode post component 2 on one side of the protruding electrode tab 33 of the electrode component 3; Step S2412: Adjust the angle of the electrode post component 2 so that the normal of the inner end face is close to the stacking direction of the multiple electrode assemblies 31", and then "Step S242: Insert the gathering part 313 into the receiving groove 5". In this way, after the gathering part 313 is inserted into the receiving groove 5 and laid on the inner end face 211 of the electrode post body 21, there is no need to adjust the angle of the electrode post body 21. This allows sufficient space near the mating position of the gathering part 313 and the inner end face 211 of the electrode post body 21 for welding operations, thereby simplifying the operation.

[0316] Please refer to this again. Figure 6 and combined Figure 71 , Figure 71 This is a flowchart illustrating the assembly method of a battery cell according to some embodiments of this application. In some embodiments of this application, the terminal component 2 includes a terminal body 21, and the electrode component 3 is connected to the terminal body 21 via a conductive part 4. The conductive part 4 includes a tab 33 composed of tabs 311 of the electrode component 3, and a conductive element 41 connected to the tab 33. The tab 33 is connected to the terminal body 21 via the conductive element 41. The step "connecting the electrode component 3 to the terminal component 2" specifically includes: step S251, connecting the tab 33 to the conductive element 41. The connection method between the tab 33 and the conductive element 41 is not limited, and can include welding such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure welding, or brazing, or through-hole connection, or bonding with conductive adhesive, etc.

[0317] Therefore, by connecting the tab 33 and the pole body 21 through the conductive element 41, the length of the tab 33 can be shortened, and problems such as wrinkling, bending and breakage of the tab 311 can be improved. Furthermore, by flexibly designing the shape and material of the conductive element 41, the connection difficulty with the pole body 21 can be reduced, and the connection convenience between the conductive element 41 and the pole body 21 can be improved.

[0318] When the tab 33 is indirectly connected to the electrode body 21 via the conductive element 41, the assembly sequence for any of the above embodiments is suitable, for example... Figure 12A-12E As shown (the conductive part 4 of the electrode component 3 first passes through the mounting hole 112, the conductive part 4 is welded to the electrode component 2 outside the mounting hole 112, and the electrode component 2 then covers the mounting hole 112 from the outside of the first shell wall 111), or Figure 24A-24DThe assembly method shown is as follows: (electrode component 3 and electrode post component 2 are welded first, and after the electrode post component 2 passes through the mounting hole 112, the mounting hole 112 is covered from the outside of the first shell wall 111) or the assembly method shown is as follows: (electrode component 3 and electrode post component 2 are welded first, and the electrode post component 2 does not pass through the mounting hole 112, and the mounting hole 112 is covered from the inside of the first shell wall 111).

[0319] Please refer to this again. Figure 66A-66C and combined Figure 72 , Figure 72 This is a flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application. In some embodiments, when the electrode component 3 includes multiple electrode assemblies 31, before "step S251 connecting the tab 33 to the conductive element 41", the method further includes: step S151 stacking multiple electrode assemblies 31 along the thickness direction of the electrode assembly 31; and step S152 stacking and aggregating the multilayer tabs 311 of at least two electrode assemblies 31 to form a stacked portion 312. Since multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31, the stacking direction of the electrode assembly 31 (e.g., ...) is... Figure 66A The fourth direction F4 shown is consistent with the thickness direction of the electrode assembly 31.

[0320] In the above technical solution, before connecting the tab 33 to the conductive element 41, multiple electrode assemblies 31 are stacked first, and several tabs 311 of the same polarity of multiple electrode assemblies 31 are gathered together to form a stacked portion 312. Compared with the technical solution of gathering the tabs 311 of each electrode assembly 31 separately to form a stacked portion 312, connecting the stacked portion 312 of each electrode assembly 31 to the conductive element 41 separately, and then stacking multiple electrode assemblies 31, on the one hand, it can reduce the total number of stacked portions 312 and conductive elements 41, reduce the connection steps between the stacked portions 312 and the conductive element 41, and improve processing efficiency. On the other hand, it can avoid the problem of cracking at the connection position between the tab 33 and the active material coating portion 32 due to the asynchronous movement of the tabs 311 of different electrode assemblies 31 when connecting the stacked portion 312 to the conductive element 41 first and then stacking the electrode assemblies 31.

[0321] When the electrode part 33 of the electrode component 3 includes a stacked part 312 formed by stacking and gathering multiple layers of electrode tabs 311 (regardless of whether steps S151 and S152 are performed beforehand, i.e., the multiple layers of electrode tabs 311 in the gathering part 313 can belong to one electrode assembly 31 or multiple electrode assemblies 31 at the same time), please refer to Figure 73 , Figure 73This is a flowchart illustrating the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, before "step S251 connecting the tab 33 to the conductive member 41", the method further includes: step S153 connecting the multiple layers of tabs 311 in the stacked portion 312 to form a gathered portion 313. Thus, the tab 33 can be connected to the conductive member 41 through the gathered portion 313.

[0322] The multilayer tabs 311 in the gathering portion 313 are electrically conductive, meaning that the multilayer tabs 311 in the gathering portion 313 not only have a stacked arrangement but are also connected and conductive. The connection method of the multilayer tabs 311 in the gathering portion 313 is not limited; for example, it can be welding such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure welding, or brazing, or through-hole connection, or bonding with conductive adhesive, etc. For example, multilayer tabs 311 of the same polarity can be ultrasonically welded, and the resulting ultrasonic weld mark constitutes the gathering portion 313.

[0323] Therefore, by pre-connecting the multiple layers of tabs 311 in the stacked portion 312 to form a gathered portion 313, the gathered portion 313 can present a plate shape with multiple layers of tabs 311 connected together and having a certain rigidity, rather than a loose and scattered multi-layer foil shape. This facilitates the connection between the tab portion 33 and the conductive component 41, and makes the welding between the tab portion 33 and the conductive component 41 more reliable. It is not easy for pores to form in the weld, which can improve the connection reliability and conductivity of the weld, and make the conductivity between the electrode component 3 and the pole component 2 more stable and reliable.

[0324] Please refer to this again. Figure 13A-13E and combined Figure 74 , Figure 74 This is a flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application. In some embodiments of this application, the conductive component 41 includes a first connecting segment 411. The step "connecting the tab 33 to the conductive component 41 in step S251" specifically includes: step S251011 stacking the gathering portion 313 on one side of the thickness direction of the first connecting segment 411; and step S251012 connecting the gathering portion 313 to the first connecting segment 411. The conductive component 41 has a first connecting segment 411, and the thickness direction of the first connecting segment 411 is consistent with that of the gathering portion 313. The two are stacked and connected (e.g., by welding) along the thickness direction of the first connecting segment 411, thus simplifying the connection between the gathering portion 313 and the conductive component 41 and improving production efficiency.

[0325] Please refer to this again. Figure 12A-12E and combined Figure 75 , Figure 75This is a flowchart illustrating the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, the conductive member 41 has a first connecting section 411, which includes two clamping portions 4110. The tab end 331 of the tab 33 (such as the gathering portion 313 or the stacked portion 312) is clamped between the two clamping portions 4110. The step "connecting the tab 33 to the conductive member 41 in step S251" specifically includes: step S251021 clamping the tab end 331 (such as the gathering portion 313 or the stacked portion 312) of the tab 33 between the two clamping portions 4110; step S251022 connecting the tab end 331 (such as the gathering portion 313 or the stacked portion 312) of the tab 33 to the two clamping portions 4110 as a whole.

[0326] Therefore, the two clamping portions 4110 can be used to limit the electrode tab 33, improving the connection reliability of the multi-layer electrode tabs 311 in the electrode tab 33. In some examples, by providing two clamping portions 4110, the electrode tab 33 clamped between the two clamping portions 4110 can be in the state of a stacked portion 312, thus eliminating the step of connecting the multi-layer electrode tabs 311 in the stacked portion 312 to form a gathered portion 313, thereby simplifying the processing steps and improving processing efficiency. Alternatively, the multi-layer electrode tabs 311 in the stacked portion 312 can be connected to form a gathered portion 313 first, and then the gathered portion 313 can be clamped between the two clamping portions 4110 and connected to the clamping portions 4110. This can reduce the porosity at the connection between the conductive element 41 and the electrode tab 33, improving the current carrying capacity and connection reliability.

[0327] Please refer to this again. Figure 76 and Figure 77 , Figure 76 This is a flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application. Figure 77 This is a flowchart of the assembly method of a battery cell provided in some embodiments of this application; in some embodiments of this application, after "step S251 connecting the tab 33 to the conductive member 41", the method may further include: step S252, adjusting the angle of the electrode post member 2 so that the inner end face 211 of the electrode post body 21 faces the electrode member 3 (i.e., faces the active material coating part 32), and the first connecting section 411 of the conductive member 41 is supported on the side of the tab 33 away from the electrode post body 211.

[0328] The phrase “the first connecting segment 411 of the conductive element 41 is supported on the side of the tab 33 away from the pole body 211” means that at least a portion of the first connecting segment 411 is supported on the side of the portion of the tab 33 connected to the first connecting segment 411 that is away from the inner end face 211 of the pole body 21.

[0329] For example, please refer to again Figure 13A-13Eand combined Figure 76 After “step S251011 stacking the gathering part 313 on one side of the thickness direction of the first connecting section 411; step S251012 connecting the gathering part 313 to the first connecting section 411”, step S252 can specifically be: the angle of the pole member 2 can be adjusted so that the inner end face 211 of the pole body 21 faces the electrode member 3, and the first connecting section 411 of the conductive member 41 is supported on the side of the gathering part 313 away from the inner end face 211 of the pole body 21.

[0330] For example, please refer to again. Figure 12A-12E and combined Figure 77 After "step S251021 clamping the tab end 331 (such as the gathering part 313 or the stacked part 312) of the tab 33 between the two clamping parts 4110; step S251022 connecting the tab end 331 (such as the gathering part 313 or the stacked part 312) of the tab 33 to the two clamping parts 4110 into one piece", step S252 can specifically be: the angle of the pole member 2 can be adjusted so that the inner end face 211 of the pole body 21 faces the electrode member 3, and a clamping part 4110 of the first connecting section 411 of the conductive member 41 is supported on the side of the tab end 331 (such as the gathering part 313 or the stacked part 312) away from the inner end face 211 of the pole body 21.

[0331] In the above technical solution, the support of the tab 33 by the first connecting section 411 of the conductive component 41 can improve the redundancy of the tab 33 and reduce the risk of short circuit caused by the tab 33 being inserted into the active material coating part 32. Moreover, the bent conductive component 41 can play a buffer support role, reducing the risk of the electrode component 3 hitting the first shell wall 111 and improving the reliability of the battery cell 102.

[0332] Please refer to this again. Figure 12A-12E and combined Figure 78 , Figure 78 This is a flowchart illustrating the assembly method of a battery cell according to some embodiments of this application. In some embodiments of this application, "step S20, connecting the electrode component 3 with the terminal component 2" may further include: step S253, connecting the conductive component 41 with the terminal body 21. That is, the conductive component 41 and the terminal body 21 are separate components but are assembled and connected, thereby allowing for flexible design and processing of the conductive component 41 and the terminal body 21, improving the diversity of the battery cell 102.

[0333] The connection method between the conductive element 41 and the electrode body 21 is not limited. For example, it can be welding, such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure welding, or brazing, or through-hole connection, or bonding with conductive adhesive, etc. Of course, this application is not limited to this. For example, in some other embodiments of this application, such as combining... Figure 13A-13E Alternatively, the conductive component 41 and the electrode body 21 can be integrated into one unit without the need for assembly and connection processes.

[0334] Please refer to this again. Figure 12A-12E and combined Figure 79 , Figure 79 The flowchart illustrates the assembly method of a battery cell 102 provided in some embodiments of this application. In some embodiments of this application, the conductive element 41 includes a second connecting segment 412. The step "connecting the conductive element 41 to the electrode body 21 in step S253" specifically includes: step S2534 laying the second connecting segment 412 on the inner end face 211 of the electrode body 21; and step S2535 connecting the second connecting segment 412 to the inner end face 211 of the electrode body 21.

[0335] In the above technical solution, by laying the second connecting segment 412 of the conductive element 41 on the inner end face 211 of the electrode body 21, at least a portion of the second connecting segment 412 falls on and connects with the inner end face 211 of the electrode body 21. This helps to increase the connection area between the second connecting segment 412 of the conductive element 41 and the electrode body 21, thereby improving charging performance. Furthermore, it facilitates the setting of the welding nozzle, improving the connection reliability between the second connecting segment 412 of the conductive element 41 and the electrode body 21.

[0336] For example, when the inner end face 211 of the pole body 21 is large, for example, when the inner end face 211 of the pole body 21 is long and narrow, such as rectangular, elliptical, racetrack-shaped, etc., the second connecting segment 412 can be completely laid flat on the inner end face 211 of the pole body 21. Alternatively, for example, when the inner end face 211 of the pole body 21 is small, the position of the inner end face 220 of the adapter structure 22 adjacent to the pole body 21 is the surrounding area 2201 of the pole body 21. The surrounding area 2201 can be set to be flush with the inner end face 211 of the pole body 21. In this case, a part of the second connecting segment 412 can be laid flat on the inner end face 211 of the pole body 21, and the rest can be laid flat on the surrounding area 2201, so that the second connecting segment 412 (for example, the second connecting segment 412 is also long strip) can be supported as a whole, which is convenient for the welding nozzle to be pressed, so that the second connecting segment 412 can be reliably connected to the pole body 21.

[0337] Please refer to this again. Figure 12A-12E and combined Figure 80 ,Figure 80 This is a flowchart illustrating the assembly method of a battery cell provided in some embodiments of this application. In some embodiments of this application, the terminal post 2 forms a receiving groove 5 that is recessed relative to the first shell wall 111 in a direction away from the electrode post 3 and open in a direction towards the electrode post 3. The electrode post 3 is connected to the terminal post 2 via a conductive part 4, and at least a portion of the conductive part 4 is accommodated in the receiving groove 5 and connected to the terminal post body 21. That is, the terminal post 2 forms the receiving groove 5, the groove wall of the receiving groove 5 is formed by the terminal post 2, the receiving groove 5 is recessed in a direction away from the active material coating part 32, and the receiving groove 5 is open in a direction towards the active material coating part 32, so that the receiving groove 5 communicates with the receiving cavity 13. At this time, before "step S2534 laying the second connecting segment 412 on the inner end face 211 of the terminal post body 21", the method further includes: step S2533, inserting the second connecting segment 412 into the receiving groove 5.

[0338] Therefore, by providing a receiving groove 5 to accommodate the second connecting section 412 of the conductive component 41, the space occupied by the conductive component 41 in the receiving cavity 13 can be reduced, allowing the receiving cavity 13 to have a larger space to accommodate the active material coating portion 32. This is beneficial for increasing the volume of the active material coating portion 32, thereby increasing the energy density of the battery cell 102. Moreover, since the receiving groove 5 is open towards the electrode component 13, the second connecting section 412 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0339] For example, when the second connecting segment 412 is housed in the receiving groove 5, the configuration of the receiving groove 5 is not limited.

[0340] For example, the receiving groove 5 is formed on the side of the electrode body 21 and the transition structure 22 facing the electrode component 3 (i.e., the side facing the active material coating portion 32). The transition structure 22 can protrude relative to the first shell wall 111 in the direction away from the electrode component 3 (i.e., the direction away from the active material coating portion 32), so that the receiving groove 5 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3. Thus, by processing the transition structure 22 into an outwardly protruding shape, a portion of the receiving groove 5 is formed on the side of the electrode body 21 facing the electrode component 3, and another portion of the receiving groove 5 is formed on the side of the transition structure 22 facing the electrode component 3. The receiving groove 5 has a shape that is recessed relative to the first shell wall 111 in the direction away from the electrode component 3, so that both the side of the electrode body 21 facing the electrode component 3 and the side of the transition structure 22 facing the electrode component 3 have a spatial second connecting section 412. This not only facilitates the storage of the second connecting section 412 to a greater extent, but also facilitates the design of diverse forms of the second connecting section 412.

[0341] Alternatively, by way of example, when the adapter structure 22 does not bulge relative to the first shell wall 111 in a direction away from the electrode component 3 (i.e., away from the active material coating portion 32), the height difference between the adapter structure 22 and the electrode body 21 can define a receiving groove 5 that is recessed relative to the first shell wall 111 in a direction away from the electrode component 3. Alternatively, the receiving groove 5 can also be defined by the first electrode component 21a and the second electrode component 21b.

[0342] For example, the surface of the electrode body 21 facing the electrode component 3 is the inner end face 211 of the electrode body 21. The inner end face 211 of the electrode body 21 helps to form the receiving groove 5, and the second connecting segment 412 is connected to the inner end face 211 of the electrode body 21. That is, at least a portion of the inner end face 211 of the electrode body 21 helps to define the groove wall of the receiving groove 5, and the second connecting segment 412 is connected to the portion of the inner end face 211 of the electrode body 21 that serves as the groove wall of the receiving groove 5. In the above technical solution, at least a portion of the receiving groove 5 is formed by the side surface of the electrode body 21 facing the electrode component 3, and the second connecting segment 412 housed in the receiving groove 5 can easily contact and connect to the electrode body 21, improving connection convenience and simplifying the structure. For example, when the electrode body 21 includes a first electrode member 21a and a second electrode member 21b, the surface of the first electrode member 21a facing the electrode component 3 is the inner end face 211 of the electrode body 21.

[0343] Please refer to this again. Figure 12A-12E and combined Figure 81 , Figure 81 The following is a flowchart of the assembly method for a battery cell provided in some embodiments of this application; in some embodiments of this application, when the electrode component 3 includes multiple electrode assemblies 31 stacked together, before "step S2534 laying the second connecting segment 412 on the inner end face 211 of the electrode post body 21", the method further includes: step S2531, placing the electrode post component 2 on one side of the electrode component 3 extending from the tab 33; step S2532, adjusting the angle of the electrode post component 2 so that the normal of the inner end face 211 of the electrode post body 21 is close to the stacking direction of the multiple electrode assemblies 31 (e.g., ...). Figure 12C (F4 shown in the diagram). In this embodiment, the stacking step of the electrode assembly 31 can be performed before connecting the gathering portion 313 to the electrode post component 2, or after connecting the gathering portion 313 to the electrode post component 2. That is, the gathering portion 313 can be formed by stacking and connecting the multilayer tabs 311 of at least two electrode assemblies 31, or it can be formed by stacking and connecting the multilayer tabs 311 of only one electrode assembly 31.

[0344] The phrase "the normal of the inner end face 211 of the electrode body 21 is close to the stacking direction of the multiple electrode components 31" means that the normal of the inner end face 211 of the electrode body 21 is consistent with or substantially consistent with the stacking direction of the multiple electrode components 31. "Substantially consistent" can be understood as the included angle between the two being small, for example, less than 10°. The phrase "setting the electrode component 2 on one side of the protruding tab 33 of the electrode component 3" can be understood as: the tab 33 is located on one side of the active material coating portion 32. Setting the electrode component 2 and the tab 33 on the same side of the active material coating portion 32 helps to shorten the total length of the conductive portion 4, save materials, and reduce costs. In the above technical solution, the "total length of the conductive part 4" is such that when the normal of the inner end face 211 of the electrode body 21 is close to the stacking direction of the multiple electrode components 31, the electrode part 2 can be located on the side of the protruding tab 33 of the electrode component 3, and the second connecting section 412 of the conductive member 41 can be laid on the inner end face 211 of the electrode body 21.

[0345] In the above technical solution, by first adjusting the position and angle of the electrode component 2 so that the normal of the inner end face 211 of the electrode body 21 is close to the stacking direction of the multiple electrode components 31, and then laying the second connecting segment 412 of the conductive component 41 on the inner end face 211 of the electrode body 21, there is no need to adjust the angle of the electrode body 21 again. This ensures that there is sufficient space near the mating position of the second connecting segment 412 and the inner end face 211 of the electrode body 21 for welding operations, thereby simplifying the operation.

[0346] For example, please refer again Figure 81 Before "step S2534, laying the second connecting segment 412 on the inner end face 211 of the electrode body 21", the procedure also includes "step S2533, inserting the second connecting segment 412 into the receiving groove 5". Before "step S2533, inserting the second connecting segment 412 into the receiving groove 5", the procedure can be "step S2531, setting the electrode component 2 on one side of the protruding tab 33 of the electrode component 3; step S2532, adjusting the angle of the electrode component 2 so that the normal of the inner end face 211 of the electrode body 21 is close to the stacking direction of the multiple electrode assemblies 31". This way, after inserting the second connecting segment 412 into the receiving groove 5 and laying it on the inner end face 211 of the electrode body 21, there is no need to adjust the angle of the electrode body 21 again. This ensures sufficient space near the mating position of the second connecting segment 412 and the inner end face 211 of the electrode body 21 for welding operations, thus simplifying the operation.

[0347] The form of the conductive element 41 is not limited to the above embodiments. For example, the design of the conductive element 41 can also have at least the following two embodiments.

[0348] In some embodiments, refer toFigure 48 The inner end face 220 of the adapter structure 22, adjacent to the electrode body 21, forms a surrounding region 2201 around the electrode body 21. The inner end face 211 of the electrode body 21 protrudes from the surrounding region 2201 in the direction of the electrode component 3. The inner end face 220 of the adapter structure 22 can be planar or non-planar, such as a raised shape. The outermost ring of the inner end face 220 of the adapter structure 22, facing the electrode body 21, forms the surrounding region 2201.

[0349] Therefore, by setting the inner end face 211 of the electrode post body 21 to protrude from the surrounding area 2201 in the direction of the electrode component 3, it is equivalent to the electrode post body 21 being drawn inward toward the receiving cavity 13 when the height of the electrode post body 21 is constant, thereby reducing the space occupied by the electrode post component 2 on the outside of the housing component 1 and reducing the space occupied by the battery cell 102 in the direction of setting the electrode post component 2 (e.g., Figure 3 The dimensions in the first direction F1 shown.

[0350] In some embodiments, refer to Figure 48 , combined Figure 82 , Figure 82 The flowchart illustrates the assembly method of a battery cell provided in some embodiments of this application. The conductive component 41 includes a first conductive segment 415 disposed on the inner end face 211 of the electrode post body 21, and a second conductive segment 416 offset from the inner end face 211 of the electrode post body 21. The second conductive segment 416 protrudes relative to the first conductive segment 415 in a direction away from the electrode component 3 (i.e., outwards, or in other words, in a direction away from the active material coating portion 32). The tab portion 33 is connected to the second conductive segment 416. In this case, "step S20, connecting the electrode component to the electrode post component" further includes: step S261, shaping the conductive component 41 to include the first conductive segment 415 and the second conductive segment 416; and step S262, connecting the tab portion 33 to the second conductive segment 416.

[0351] Thus, when the inner end face 211 of the electrode body 21 is small (for example, the transition structure 22 is set as an elongated strip extending along the length direction of the first shell wall 111, and the electrode body 21 is located in the center of the transition structure 22 and has a circular outline), the height difference between the inner end face 211 of the electrode body 21 and the surrounding area 2201 can be used to accommodate the second conductive segment 416 of the conductive element 41 and the tab 33, thereby making full use of the space, reducing the space occupied by the conductive part 4 in the receiving cavity 13, and improving the energy density of the battery cell 102. For example, if the part where the tab 33 connects to the second conductive segment 416 (such as the folding part 313 in this article) is elongated, the second conductive segment 416 can also be set as elongated, while the first conductive segment 415 can be set as a circle that matches the electrode body 21, which can meet the connection requirements.

[0352] In addition, when the conductive element 41 includes a first conductive segment 415 and a second conductive segment 416, in order to ensure that the second conductive segment 416 protrudes relative to the first conductive segment 415 in the direction away from the electrode component 3, a material with a certain hardness and thickness can be selected to process the conductive element 41. For example, the conductive element 41 can be a metal sheet.

[0353] In some embodiments, refer to Figure 49 The position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 that surrounds the electrode body 21. The surrounding region 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction of the electrode component 3. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a raised shape. The outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0354] Therefore, by setting the surrounding area 2201 to protrude from the inner end face 211 of the electrode body 21 in the direction of the electrode component 3, a space for accommodating the conductive part 4 can be formed between the surrounding area 2201 and the inner end face 211 of the electrode body 21, thereby reducing the space occupied by the conductive part 4 in the accommodating cavity 13 and improving the energy density of the battery cell 102.

[0355] In some embodiments, refer to Figure 49 , combined Figure 83 , Figure 83 This is a flowchart illustrating the assembly method of a battery cell provided in some embodiments of this application. The inner end face 211 of the electrode post body 21 includes a mating region 211a opposite to the annular hole of the surrounding region 2201. The conductive member 41 includes a first conductive segment 415 laid in the mating region 211a and a third conductive segment 417 offset from the mating region 211a. The third conductive segment 417 protrudes relative to the first conductive segment 415 toward the electrode component 3 (i.e., toward the inward side, or toward the active material coating portion 32). The tab portion 33 is connected to the third conductive segment 417. At this time, "step S20, connecting the electrode component and the electrode post component" further includes: step S271, shaping the conductive member 41 so that the conductive member 41 includes the first conductive segment 415 and the third conductive segment 417; step S272, connecting the tab portion 33 to the third conductive segment 417.

[0356] Thus, when the inner end face 211 of the pole body 21 is small (for example, the adapter structure 22 is configured as an elongated strip extending along the length direction of the first shell wall 111, and the pole body 21 is located in the center of the adapter structure 22 with a circular outline), by setting the first conductive segment 415 to be small (e.g., circular) so that it can extend into the annular hole surrounding the region 2201 and be laid in the mating region 211a, the adapter 41 can satisfy both the connection requirements with the inner end face 211 of the pole body 21 and the connection requirements with the tab 33. For example, if the portion of the tab 33 connected to the third conductive segment 417 (such as the retracted portion 313 described herein) is elongated, the third conductive segment 417 can also be set as elongated, thereby increasing the connection area between the two. At the same time, setting the first conductive segment 415 to a shape that matches the mating region 211a (e.g., circular) can satisfy the connection requirements.

[0357] Furthermore, when the conductive element 41 includes a first conductive segment 415 and a third conductive segment 417, in order to ensure that the third conductive segment 417 protrudes relative to the first conductive segment 415 toward the electrode component 3, a material with a certain hardness and thickness can be selected to process the conductive element 41. For example, the conductive element 41 can be a metal sheet.

[0358] In some embodiments of this application, when the adapter structure 22 is formed as an elongated strip (e.g., rectangular, elliptical, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111, and the outline shape of the pole body 21 matches the outline shape of the adapter structure 22 (e.g., rectangular, elliptical, racetrack-shaped, etc.), any of the above-mentioned connection schemes between the conductive part 4 and the pole body 21 can be selected. For example, regardless of whether the surrounding region 2201 is flush with the inner end face 211 of the electrode body 21 (the surrounding region 2201 is flush with the inner end face 211 of the electrode body 21), concave (the inner end face 211 of the electrode body 21 protrudes from the surrounding region 2201 in the direction of the electrode component 3), or convex (the surrounding region 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction of the electrode component 3), the electrode connection portion of the electrical part 4 (e.g., the tab 33 or the conductive member 41) (e.g., the folding portion 313 of the tab 33 in this article, or the second connection segment 412 or the first conductive segment 415 of the conductive member 41) can be set as an elongated strip that matches the contour shape of the inner end face 211 of the electrode body 21 and laid on the inner end face 211 of the electrode body 21, thereby increasing the connection area between the conductive part 4 and the electrode body 21 and improving the charging performance.

[0359] For example, the conductive part 4 may include a pole connection part, which may be a relatively rigid plate shape, such as one that will not bend or deform downward under the action of gravity, such as the folding part 313 of the tab 33 described herein (such as an ultrasonic weld), or the second connecting section 412 (such as a metal sheet) or the first conductive section 415 (such as a metal sheet) of the conductive member 41.

[0360] In some embodiments of this application, please refer again to Figure 6 The electrode component 3 includes an active material coating portion 32 housed in the receiving cavity 13. The active material coating portion 32 is connected to the electrode body 21 via a conductive portion 4. The conductive portion 4 is bent to form at least two opening grooves 42, wherein the openings of the two opening grooves 42 face different directions and are adjacent in the direction from the electrode body 21 to the active material coating portion 32 (e.g., Figure 6 As shown, one of the two adjacent opening slots 42 faces left and the other faces right, making the conductive part 4 roughly "S" shaped. Thus, the conductive part 4 can exhibit a serpentine, reciprocating shape, acting as a buffer. When the battery cell 102 is used in a vibration environment, it reduces the impact of the active material coating part 32 towards the first shell wall 111, protecting the electrode components 3 and improving the reliability of the battery cell 102. Furthermore, since the conductive part 4 does not extend irregularly, it reduces interference and friction between the tabs 311 and the risk of the tabs 311 being inserted backwards into the active material coating part 32, further enhancing the reliability of the battery cell 102.

[0361] For example, please refer again Figure 6 When the conductive part 4 includes a tab 33 and a conductive member 41 connected to the tab 33, and the tab 33 is connected to the pole body 21 via the conductive member 41, the conductive member 41 and the tab 33 are bent together to form two adjacent opening slots 42 with opposite opening orientations. For example, the first connecting segment 411 and the tab 33 define another opening slot 42 (e.g., the first opening slot 421), and an opening slot 42 (e.g., the second opening slot 422) is defined between the first connecting segment 411 and the second connecting segment 412. Thus, the conductive part 4 can present a reciprocating S-shape, thereby shortening the length of the conductive part 4, simplifying the structure of the conductive part 4, and facilitating the processing of the conductive part 4.

[0362] Alternatively, for example, please refer to Figure 10DWhen the tab 33 forms the conductive part 4, extending to and connecting to the electrode body 21, and the tab 33 is bent alone to form two adjacent opening slots 42 with opposite opening directions, the conductive part 4 can thus exhibit a reciprocating S-shape, thereby shortening the length of the conductive part 4, simplifying its structure, and facilitating its processing.

[0363] Combination Figure 10A-10D , Figure 12A-1 0E, and refer to Figure 84 , Figure 84 This is a flowchart illustrating the steps of a battery cell assembly method provided in some embodiments of this application. In some embodiments of this application, when the conductive portion 4 is bent to form at least two opening slots 42, and the openings of two adjacent opening slots 42 have different orientations and are adjacent in the direction from the electrode post 2 to the active material coating portion 32, "step S30, installing the electrode post 2 connected to the electrode post 3 to the first shell wall 111" may specifically include: "step S30c, shaping the conductive portion 4 to bend the conductive portion 4 to form the aforementioned at least two opening slots 42." The method and time of shaping the conductive portion 4 are not limited. For example, it can be performed concurrently with the covering action of the electrode post 2 onto the first shell wall 111, or concurrently with the covering action of the first electrode post 21a onto the second electrode post 21b, thereby improving processing efficiency.

[0364] For example, please refer to Figure 85 , Figure 85 The flowchart of the assembly method for a battery cell provided in some embodiments of this application shows that "step S30c, shaping the conductive portion 4 to bend the conductive portion 4 to form the above-mentioned at least two opening grooves 42" can specifically be: step S30c1, bending the portion of the conductive portion 4 located between the terminal post component 2 and the active material coating portion 32 to form two opening grooves 42 with opposite opening directions, such as a first opening groove 421 and a second opening groove 422. This simplifies step S30c, and the conductive portion 4 can exhibit a reciprocating S-shape, thereby shortening the length of the conductive portion 4, simplifying its structure, and facilitating its processing.

[0365] For example, please combine Figure 12A-1 0E, and refer to Figure 86 , Figure 86This is a flowchart of the assembly method of a battery cell provided in some embodiments of this application. The battery cell 102 includes a shaping bracket 9 disposed on the side of the electrode component 3 near the terminal post component 2. The shaping bracket 9 has a through hole 91. In the state where the conductive part 4 passes through the through hole 91, the active material coating part 32 connected to the conductive part 4 is located inside the shaping bracket 9, and the terminal post component 2 connected to the conductive part 4 is located outside the first shell wall 111, "step S30c1, making the conductive part 4 located between the terminal post component 2 and the active material coating part 32, and the active material coating part 3 ... The bending and deformation of the portion between the material coating parts 32 to form two opening grooves 42 with opposite opening directions may specifically include: Step S30c11, accompanying the action of covering the electrode post 2 towards the first shell wall 111, causing the conductive part 4 to form two opening grooves 42 with opposite opening directions on the inner and outer sides of the shaping bracket 9, that is, the conductive part 4 forms one opening groove (i.e., the first opening groove 421) on the inner side of the shaping bracket 9, and the conductive part 4 forms another opening groove (i.e., the second opening groove 422) on the outer side of the shaping bracket 9. Thus, by setting the shaping bracket 9, it is easy for the conductive part 4 to bend into two opening grooves 42 with opposite opening directions, reducing the processing difficulty. This solution is applicable when the conductive part 4 is composed solely of the electrode tab 33, and it is also applicable when the conductive part 4 is composed of both the electrode tab 33 and the conductive member 41.

[0366] For example, please refer to Figure 39 The ratio of the width W2 to the length L2 of the electrode post 2 is between 10% and 60%, and this range applies to both the positive and negative electrode post 2. Furthermore, the ratio of the width W2 to the length L2 of the electrode post 2 can also be between 25% and 40%. For example, if the width W2 of the electrode post 2 is approximately 21 mm and the length L2 is approximately 63 mm, the ratio of the width W2 to the length L2 of the electrode post 2 is approximately 33%.

[0367] Therefore, by setting the ratio of the width W2 of the electrode component 2 to the length L2 of the electrode component 2 to be 10%~60%, the overall area of ​​the electrode component 2 can be relatively large, which is beneficial to ensure that the electrical connection area between the electrode component 2 and the electrode component 3 can meet the relatively large requirements. At the same time, the width of the electrode component 2 is relatively small compared to its length. Thus, when connecting the electrode component 2 and the electrode component 3, the electrode component 2 can be placed with one edge of its width facing the active material coating part 32. Since the width of the electrode component 2 is small, it is beneficial to shorten the distance between the electrode component 2 and the active material coating part 32, thereby shortening the length of the conductive part 4 and reducing the redundancy of the conductive part 4.

[0368] For example, please refer to Figure 39The electrode post 2 can be configured such that the ratio of its width W2 to the width W1 of the first shell wall 111 is 20% to 90%, a range applicable to both the positive and negative electrode posts 2. Further, the ratio of the width W2 of the electrode post 2 to the width W1 of the first shell wall 111 is 70% to 80%, for example, the width W2 of the electrode post 2 is approximately 21 mm, and the width W1 of the first shell wall 111 is approximately 28 mm, resulting in a ratio of approximately 75%. This allows the electrode post 2 to fully utilize the space in the width direction of the first shell wall 111. For example, the width W1 of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the width direction of the first shell wall 111, for example... Figure 3 The width of the first shell wall 111 shown is the same as the size of the battery cell 102 in the second direction F2.

[0369] For example, please refer to Figure 39 When two electrode members 2 are provided on the first shell wall 111 at intervals along the length direction of the first shell wall 111, the ratio of the length L2 of the electrode member 2 to the length L1 of the first shell wall 111 is 25% ± 15% (i.e., 10% to 40%). This range applies to both the positive electrode member 2 and the negative electrode member 2. Further, the ratio of the length L2 of the electrode member 2 to the length L1 of the first shell wall 111 is 15% to 30%. For example, if the length L2 of the electrode member 2 is approximately 63 mm and the length L1 of the first shell wall 111 is approximately 297 mm, the ratio of the length L2 of the electrode member 2 to the length L1 of the first shell wall 111 is approximately 21%. This allows the electrode member 2 to fully utilize the space along the length direction of the first shell wall 111. For example, the length L1 of the first shell wall 111 is consistent with the dimension of the battery cell 102 along the length direction of the first shell wall 111. Figure 3 The length of the first shell wall 111 shown is the same as the size of the battery cell 102 in the third direction F3.

[0370] For example, please refer to Figure 4 The shape of the mounting hole 112 matches the outline shape of the pole member 2. For example, when the pole member 2 includes a transition structure 22, the outline shape of the transition structure 22 (i.e., the outer ring shape of the transition structure 22) matches the shape of the mounting hole 112, which is beneficial to the connection between the pole member 2 and the first shell wall 111, and also beneficial to expose more area of ​​the pole member 2 in the direction of the receiving cavity 13, which is beneficial to the reception of the conductive part 4 and / or connection with the conductive part 4.

[0371] For example, the shape of the mounting hole 112 matches the outline shape of the pole member 2, and is orthographically projected onto a projection plane perpendicular to the thickness direction of the first shell wall 111. The orthographic projection of the mounting hole 112 on the projection plane falls completely within the orthographic projection range of the pole member 2 on the projection plane, thereby making the first shell wall 111 and the pole member 2 have a certain overlapping area, which is beneficial to the simple and reliable connection between the two.

[0372] Please refer to Figure 4 In some embodiments of this application, the mounting hole 112 is an elongated hole (e.g., rectangular, elliptical, or racetrack-shaped), and the electrode post 2 is formed as an elongated structure (e.g., rectangular, elliptical, or racetrack-shaped) that matches the shape of the mounting hole 112. When the electrode post 2 is first connected to the electrode post 3, then the electrode post 2 and electrode post 3 are installed together into the housing 11, and then the electrode post 2 extends from the mounting hole 112 to the outside of the first housing wall 111, and then the electrode post 2 is flipped over from the outside of the first housing wall 111 to cover the mounting hole 112, and then the electrode post 2 is connected to the first housing wall 111, if the electrode post 2 is set as an elongated structure that matches the shape of the mounting hole 112, the electrode post 2 can be adjusted so that its thickness direction is parallel to the width direction of the mounting hole 112 (e.g., [missing information]). Figure 4 The second direction F2 shown in the figure passes through the mounting hole 112 at an angle close to the mounting hole 112. After the pole post component 2 passes through the mounting hole 112, the thickness direction of the pole post component 2 is rotated to be close to the thickness direction of the first shell wall 111 (e.g., Figure 4 As shown in the first direction F1), the space required for the flipping movement of the electrode component 2 is smaller, which can reduce the space required for the flipping of the electrode component 2, thereby shortening the length of the conductive part 4, saving materials, reducing costs, and reducing the redundancy of the conductive part 4, reducing the space occupied by the conductive part 4 in the cavity 13, which is beneficial to improving the energy density of the battery cell 102.

[0373] According to a second aspect of the present application, the present application also provides a battery cell 102, which is manufactured using the assembly method of any of the above embodiments, thereby improving the reliability of the battery cell 102.

[0374] For example, the shell body 11 is a semi-closed cylindrical shape with an opening 113 at one end, and the end of the shell body 11 opposite to the opening 113 serves as the first shell wall 111; or, the shell cover 12 is flat and serves as the first shell wall 111. Thus, the shell component 1 has various shapes and can adapt to various application scenarios.

[0375] In some embodiments of this application, please refer again to Figure 3The battery cell 102 also includes a pressure relief device 6, which is disposed on the housing component 1. Exemplarily, the pressure relief device 6 can be an explosion-proof valve installed on the housing component 1, or it can be integrally formed on a thinned area of ​​the housing component 1. Thus, by providing the pressure relief device 6, when the pressure inside the housing component 1 exceeds a preset value, the pressure can be directionally released through the pressure relief device 6, thereby improving the safety and reliability of the battery cell 102.

[0376] For example, combined Figure 3 The pressure relief device 6 and the terminal post component 2 are located on the same side. Since the terminal post component 2 is located on the first housing wall 111, when the pressure relief device 6 is also located on the first housing wall 111, the pressure relief device 6 and the terminal post component 2 are located on the same side. As a result, the design of the other housing walls besides the first housing wall 111 can be simplified, and the structure and processing of the battery cell 102 can be simplified.

[0377] For example, the pressure relief device 6 and the pole member 2 are located on opposite sides. Since the pole member 2 is located on the first shell wall 111, when the pressure relief device 6 is also located on another wall of the shell member 1 other than the first shell wall 111, for example, the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, and the pressure relief device 6 is located on the second shell wall 114, or the pressure relief device 6 is located on the shell cover 12, then the pressure relief device 6 and the pole member 2 are located on opposite sides. Therefore, there is no need to consider reducing the volume of the pole member 2 by occupying the space of the first shell wall 111, so that the shape and area of ​​the pole member 2 can be flexibly designed as needed.

[0378] For example, the pressure relief device 6 and the pole member 2 are located on opposite sides. Since the pole member 2 is located on the first shell wall 111, when the pressure relief device 6 is located on a wall of the shell member 1 other than the first shell wall 111, for example, the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, and the pressure relief device 6 is located on the second shell wall 114, or the pressure relief device 6 is located on the shell cover 12, then the pressure relief device 6 and the pole member 2 are located on opposite sides. Therefore, there is no need to consider reducing the volume of the pole member 2 by occupying the space of the first shell wall 111, so that the shape and area of ​​the pole member 2 can be flexibly ...

Claims

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

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

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

4. The assembly method according to claim 3, characterized in that, The steps of placing the electrode post component connected to the electrode component at the mounting hole and connecting the adapter structure to the first shell wall specifically include: The electrode component connected to the conductive part is covered by the mounting hole from the outside of the first shell wall so that the adapter structure abuts against the outside of the first shell wall; The transition structure is connected to the first shell wall from the outside of the first shell wall.

5. The assembly method according to claim 3 or 4, characterized in that, The end of the housing opposite the opening is the first housing wall; the step of placing the electrode component and the conductive part connected to the electrode component inside the first housing wall, and extending the conductive part through the mounting hole to the outside of the first housing wall specifically includes: Adjust the relative positions of the housing, the electrode component, and the conductive part so that the electrode component is located on the side of the conductive part connected to it away from the housing, and the opening of the housing faces the conductive part; The electrode components and the conductive parts are installed into the housing.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

39. The assembly method according to claim 38, characterized in that, The electrode post component forms a receiving groove that is recessed relative to the first shell wall in a direction away from the electrode component and open in a direction towards the electrode component; Before the step of laying the second connecting segment on the inner end face of the pole body, the following steps are also included: The second connecting segment is inserted into the receiving groove.

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

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

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

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

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

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

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

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

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

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

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

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

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