Battery cell, battery, and electrical apparatus

Abstract

A battery cell (102), a battery (100), and an electrical apparatus, belonging to the technical field of batteries. The battery cell (102) comprises: a casing component (1), a pole component (2), and an electrode component (3), the casing component (1) having an accommodating cavity (13) and comprising a first casing wall (111) which participates in enclosingly forming the accommodating cavity (13). The electrode component (3) is accommodated in the accommodating cavity (13). The pole component (2) and the first casing wall (111) are located on the same side of the electrode component (3) and are mounted on the first casing wall (111). The electrode component (3) is connected to the pole component (2) by means of a conductive portion (4), an accommodating recess (5) in communication with the accommodating cavity (13) is formed at the pole component (2), the accommodating recess (5) is open in the direction facing the electrode component (3) and is at least partially surrounded by the pole component (2), and at least part of the conductive portion (4) is accommodated in the accommodating recess (5).

Description

Battery cell, battery and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0002] In recent years, new energy vehicles have made a great 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 energy density of the battery cell and the power battery needs to be further improved.

[0003] SUMMARY

[0004] The embodiments of the present application provide a battery cell, a battery and an electric device, which can improve the energy density of the battery cell.

[0005] In a first aspect, the embodiments of the present application provide a battery cell, comprising: a shell component, a pole component and an electrode component, the shell component has a receiving cavity and comprises a first shell wall participating in forming the receiving cavity; the electrode component is accommodated in the receiving cavity; the pole component is located on the same side of the electrode component as the first shell wall, and is installed on the first shell wall; the electrode component is connected with the pole component through a conductive part; the pole component is formed with a receiving groove in communication with the receiving cavity, the receiving groove is open in the direction of the electrode component, and at least part of the receiving groove is surrounded by the pole component; and at least part of the conductive part is accommodated in the receiving groove.

[0006] In the above technical solution, the receiving groove is arranged to accommodate the conductive part, 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 conducive to increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell. Moreover, since the receiving groove is open in the direction of the electrode component, the conductive part can easily extend into the receiving groove, reducing the operation difficulty. In addition, the first shell wall and the pole component are arranged on the same side of the electrode component, which can shorten the installation distance of the pole component and improve the reliability of the battery cell.

[0007] In some embodiments, the receiving groove is recessed relative to the first shell wall in a direction away from the electrode component.

[0008] In the above technical solution, at least part of the receiving groove exceeds the first shell wall in the direction of the outer side, so as to further 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 conducive to increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell.

[0009] In some embodiments, the pole column component comprises a pole column body connected with the conductive part, a side surface of the pole column body facing the electrode component is an inner end surface of the pole column body, and the inner end surface of the pole column body participates in surrounding the accommodation groove.

[0010] In the above technical solution, at least part of the accommodation groove is surrounded by the side surface of the pole column body facing the electrode component, and the conductive part accommodated in the accommodation groove can easily contact and connect to the inner end surface of the pole column body, thereby improving the connection convenience and simplifying the structure.

[0011] In some embodiments, the pole column component comprises a pole column body, a first adapter structure and a first insulation structure, the first adapter structure surrounds the pole column body and is connected with the first shell wall, the first insulation structure is insulated and sealingly fitted between the first adapter structure and the pole column body, the conductive part is connected with the pole column body, and the accommodation groove comprises a first accommodation groove surrounded by the pole column component.

[0012] In the above technical solution, since the pole column component comprises, in addition to the pole column body, the first adapter structure connected with the first shell wall, and the first insulation structure serving as insulation and sealing is arranged between the first adapter structure and the pole column body, when the pole column component is mounted to the first shell wall and the first adapter structure is connected with the first shell wall, no sealing member needs to be arranged between the first adapter structure and the first shell wall, and no large sealing pressure needs to be applied to meet the compression degree of the sealing member, thereby reducing the stress on the first shell wall and playing a role in protecting the shell component, thereby facilitating the reduction of the wall thickness of the shell component and the reduction of the material cost. Moreover, the first accommodation groove is surrounded by the pole column component with the above structure, which facilitates the flexible processing of the first accommodation groove and the design of the shape and volume of the first accommodation groove.

[0013] In some embodiments, an outer contour of the orthographic projection of the first accommodation groove on the first shell wall is located at the periphery of an outer contour of the orthographic projection of the pole column body on the first shell wall.

[0014] In the above technical solution, by arranging the orthographic projection of the pole column body on the first wall to fall within the outer contour of the orthographic projection of the first accommodation groove on the first wall, the range of the first accommodation groove is large, which is conducive to accommodating the conductive part to a greater extent and facilitating the connection of the conductive part with the pole column body.

[0015] In some embodiments, the first accommodation groove is formed on the side of the pole column body and the first adapter structure facing the electrode component.

[0016] In the above technical solution, since the first accommodation groove comprises the part formed on the inner side of the pole column body and the part formed on the inner side of the first adapter structure, the orthographic projection of the pole column body on the first wall can fall within the outer contour of the orthographic projection of the first accommodation groove on the first wall, and the first accommodation groove is convenient and easy to process.

[0017] In some embodiments, the first accommodating groove is formed on the side of the pole body and the first adapter structure facing the electrode component, and the first adapter structure is raised relative to the first shell wall in a direction away from the electrode component, so that the first accommodating groove is recessed relative to the first shell wall in a direction away from the electrode component.

[0018] In the above technical solution, by machining the first adapter structure into a raised form protruding outward, a part of the first accommodating groove is formed on the side of the pole body facing the electrode component, and another part of the first accommodating groove is formed on the side of the first adapter structure facing the electrode component, and the first accommodating groove has a shape recessed relative to the first shell wall in a direction away from the electrode component, so that the side of the pole body facing the electrode component and the side of the first adapter structure facing the electrode component both have space to accommodate the conductive part. In this way, not only is it convenient to accommodate the conductive part to a greater extent, but it is also conducive to the form diversity design of the conductive part.

[0019] In some embodiments, the inner end surface of the pole body and the inner end surface of the first adapter structure jointly enclose the first accommodating groove.

[0020] In the above technical solution, the first accommodating groove can be enclosed relatively simply, and the inner end surface of the pole body can constitute a partial groove wall of the first accommodating groove, so that the conductive part accommodated in the first accommodating groove can easily contact and connect to the pole body, improving connection convenience and simplifying the structure.

[0021] In some embodiments, the first adapter structure includes a first adapter ring and a second adapter ring, the second adapter ring is arranged on the side of the first adapter ring away from the electrode component, the outer ring of the first adapter ring is connected to the first shell wall, and the inner ring of the first adapter ring and the inner ring of the second adapter ring jointly hold the pole body through the first insulating structure; the first accommodating groove is formed on the side of the first adapter ring and the pole body facing the electrode component, the first adapter ring is raised relative to the first shell wall in a direction away from the electrode component, so that the first accommodating groove is recessed relative to the first shell wall in a direction away from the electrode component, and the second adapter ring is connected to the raised part of the first adapter ring.

[0022] In the technical solution, the first adapter structure comprises a first adapter ring and a second adapter ring which are arranged inside and outside and assembled together, so that the first adapter structure is assembled with the first insulating structure and the pole body, and the pole part is easy to manufacture. The outer ring of the first adapter ring is connected with the first shell wall, and the second adapter ring is connected with the raised part of the first adapter ring, so that the position where the second adapter ring is connected with the first adapter ring and the position where the first adapter ring is connected with the first shell wall are both away from each other in two spatial dimensions, so that the heat influence of the two positions on each other is reduced, and the connection reliability of the second adapter ring with the first adapter ring and the connection reliability of the first adapter ring with the first shell wall are improved.

[0023] In some embodiments, the pole body comprises a peripheral part, and the first insulating structure comprises a sealing structure; the sealing structure is an integral part and is clamped between the first adapter ring and the peripheral part and between the second adapter ring and the peripheral part; or the first insulating structure further comprises a first insulating part, the sealing structure is clamped between the first adapter ring and the peripheral part, and the second adapter ring is insulated and fixedly connected with the pole body through the first insulating part.

[0024] In the technical solution, the first insulating structure has flexible and various structures, is easy to assemble, and is beneficial to sealing.

[0025] In some embodiments, the first adapter structure comprises a third adapter ring, the outer ring of the third adapter ring is connected with the first shell wall, the third adapter ring comprises a first extension part and a second extension part which are arranged integrally, the second extension part is connected with the first extension part on the side away from the electrode part, and the first extension part and the second extension part are clamped with the pole body through the first insulating structure; the first accommodating groove is formed on the side of the third adapter ring and the pole body which faces the electrode part, and the third adapter ring is raised relative to the first shell wall in the direction away from the electrode part, so that the first accommodating groove is recessed relative to the first shell wall in the direction away from the electrode part.

[0026] In the technical solution, the third adapter ring comprises the first extension part and the second extension part which are arranged integrally, so that the process of connecting the first extension part and the second extension part is omitted, the use of parts is reduced, the first extension part and the second extension part are not easy to separate, and the clamping reliability of the pole body by the first insulating structure is improved.

[0027] In some embodiments, the pole body comprises a peripheral part, and the first insulating structure comprises a sealing structure; the sealing structure is an integral part and is clamped between the first extension part and the peripheral part and between the second extension part and the peripheral part; or the first insulating structure further comprises a first insulating part, the sealing structure is clamped between the first extension part and the peripheral part, and the first insulating part is clamped between the second extension part and the peripheral part.

[0028] In the technical solution, the first insulation structure has flexible structure, is convenient to assemble, and is beneficial to sealing.

[0029] In some embodiments, the first adapter structure includes a fourth adapter ring, the fourth adapter ring includes a fitting ring portion, the pole body is arranged through the fitting ring portion and is clamped on the inner and outer sides of the fitting ring portion by the first insulation structure, the first accommodating groove is formed on the fourth adapter ring and the side of the pole body facing the electrode component, and the fourth adapter ring is raised relative to the first shell wall in a direction away from the electrode component, so that the first accommodating groove is recessed relative to the first shell wall in a direction away from the electrode component.

[0030] In the technical solution, the fourth adapter ring is clamped by the pole body, the structure of the pole component is simple and easy to process, and the relative fixation and insulation cooperation of the pole body and the first adapter structure can be simply and effectively realized.

[0031] In some embodiments, the pole body includes a penetrating portion penetrating the fitting ring portion, and an inner limiting portion and an outer limiting portion connected with the penetrating portion and clamped on the inner and outer sides of the fitting ring portion, the first insulation structure includes a sealing structure, the sealing structure is an integral forming part and is clamped between the inner limiting portion and the fitting ring portion and between the outer limiting portion and the fitting ring portion at the same time, or the first insulation structure further includes a second insulation part, the sealing structure is clamped between the fitting ring portion and the inner limiting portion, and the second insulation part is clamped between the outer limiting portion and the fitting ring portion.

[0032] In the technical solution, the first insulation structure has flexible structure, is convenient to assemble, and is beneficial to sealing.

[0033] In some embodiments, the inner end surface of the pole body and the inner end surface of the first adapter structure both participate in surrounding the first accommodating groove, the position of the inner end surface of the first adapter structure adjacent to the pole body is a surrounding area surrounding the pole body, and the surrounding area is flush with the inner end surface of the pole body.

[0034] In the technical solution, when the inner end surface of the pole body is small, a part of the pole connecting portion of the conductive part can be laid on the inner end surface of the pole body, and the remaining part is laid on the surrounding area, so that the pole connecting portion of the conductive part as a whole can be supported, the pressing of the welding nozzle is facilitated, and the conductive part can be reliably connected with the pole body.

[0035] In some embodiments, the inner end surface of the pole body and the inner end surface of the first adapter structure both participate in surrounding the first accommodating groove, the position of the inner end surface of the first adapter structure adjacent to the pole body is a surrounding area surrounding the pole body, and the inner end surface of the pole body protrudes from the surrounding area in a direction facing the electrode component.

[0036] In the technical solution, the inner end surface of the pole body protrudes towards the electrode component, which is equivalent to inwardly retracting the pole body towards the accommodating cavity, thereby reducing the space occupied by the pole component outside the shell component and reducing the size of the battery monomer in the direction of the pole component.

[0037] In some embodiments, the first adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the profile shape of the pole body matches the profile shape of the first adapter structure.

[0038] In the technical solution, the inner end surface of the pole body is relatively large, which is conducive to laying the pole connecting part of the conductive part on the inner end surface of the pole body, and is conducive to improving the connection area of the conductive part and the pole body, thereby improving the charging performance.

[0039] In some embodiments, the first adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the pole body is arranged at the center of the first adapter structure and has a circular profile.

[0040] In the technical solution, when the first adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the pole body is arranged at the length center position of the adapter structure and has a circular profile, the connection position of the first adapter structure and the pole body is uniformly stressed, the compression amount of the first insulating structure is easily controlled, the reliability of the sealing cooperation of the two is improved, and the sealing area is relatively small and not prone to failure.

[0041] In some embodiments, the first adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the pole body is arranged at the center of the first adapter structure and has a circular profile; the conductive part includes a tab part and a conductive piece connected to the tab part, the conductive piece includes a first conductive segment laid on the inner end surface of the pole body, and a second conductive segment offset from the inner end surface of the pole body, the second conductive segment protrudes in a direction away from the electrode component relative to the first conductive segment, and the tab part is connected to the second conductive segment.

[0042] In the technical solution, when the first adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the pole body is arranged at the length center position of the adapter structure and has a circular profile, the connection position of the first adapter structure and the pole body is uniformly stressed, the compression amount of the first insulating structure is easily controlled, the reliability of the sealing cooperation of the two is improved, and the sealing area is relatively small and not prone to failure. In addition, by arranging the conductive part to include the first conductive segment and the second conductive segment, the second conductive segment of the conductive piece and the tab part can be accommodated by the height difference between the inner end surface of the pole body and the surrounding area, thereby making full use of the space, reducing the space occupied by the conductive part in the accommodating cavity, and improving the energy density of the battery monomer.

[0043] In some embodiments, the outer contour of the orthographic projection of the first accommodating groove on the first shell wall is within the outer contour of the orthographic projection of the pole body on the first shell wall.

[0044] In the above technical solution, the range of the first accommodating groove is relatively small compared to the pole body.

[0045] In some embodiments, the first adapter structure includes a surrounding part located on the side of the pole body close to the electrode component, the surrounding part surrounds an avoiding hole, the pole body covers the side of the avoiding hole away from the electrode component, the first accommodating groove includes a first recess surrounded by the surrounding part and the pole body and recessed towards the side away from the electrode component, the conductive part is connected to the pole body through the first recess, and the outer contour of the orthographic projection of the first recess on the first shell wall is within the outer contour of the orthographic projection of the pole body on the first shell wall.

[0046] In the above technical solution, by setting a difference between the pole body and the surrounding part, the first recess can be naturally formed by the relative position of the pole body and the first adapter structure, and the first recess is easy to obtain.

[0047] In some embodiments, the first adapter structure is raised relative to the first shell wall towards the side away from the electrode component to define a base groove recessed relative to the first shell wall towards the side away from the electrode component, the base groove is open towards the side of the electrode component and communicates with the side of the first recess towards the electrode component, and the conductive part extends into the first recess through the base groove and is connected to the pole body.

[0048] In the above technical solution, the first accommodating groove includes the base groove and the first recess, and the conductive part is connected to the pole body through the base groove and the first recess, so that the volume of the first accommodating groove can be increased, and the space occupation of the conductive part in the accommodating cavity is further reduced.

[0049] In some embodiments, the pole body includes a first pole component and a second pole component, the second pole component is connected to the first adapter structure and defines a fitting hole, the first pole component is assembled on the side of the second pole component away from the electrode component and covers the fitting hole, and the first accommodating groove includes a second recess surrounded by the first pole component and the second pole component, and the outer contour of the orthographic projection of the second recess on the first shell wall is within the outer contour of the orthographic projection of the pole body on the first shell wall.

[0050] In the above technical solution, the pole body is assembled by two parts to define the second recess by itself, so that the second recess is easy to obtain.

[0051] In some embodiments, the first adapter structure protrudes towards a direction away from the electrode component relative to the first shell wall to define a base groove recessed towards the direction away from the electrode component relative to the first shell wall, the base groove opens towards the direction of the electrode component and communicates with a side of the second groove towards the electrode component, and the conductive part extends into the second groove through the base groove and connects with the pole body.

[0052] In the above technical solution, the first accommodating groove includes the base groove and the second groove, and the conductive part connects with the pole body through the base groove and the second groove, so that the volume of the first accommodating groove can be increased, and the space occupation of the conductive part in the accommodating cavity is further reduced.

[0053] In some embodiments, the pole component cover is arranged on a side of the first shell wall away from the electrode component, the pole component includes a pole body, a second adapter structure and a second insulation structure, the second adapter structure surrounds the pole body and connects with the first shell wall, the second insulation structure is in insulating fit between the second adapter structure and the pole body, and the conductive part connects with the pole body; the first shell wall has a mounting hole, a sealing ring is arranged around the mounting hole, the sealing ring is clamped between the pole component and the first shell wall, the pole component and the sealing ring surround a second accommodating groove recessed towards a direction away from the electrode component, and the accommodating groove includes the second accommodating groove.

[0054] In the above technical solution, the pole component has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall, and the second accommodating groove is defined.

[0055] In some embodiments, the pole component includes a pole body, the conductive part connects with the pole body, the pole body includes a first pole part and a second pole part, the second pole part connects with the first shell wall and defines a fit hole, the first pole part is assembled on a side of the second pole part away from the electrode component, and the accommodating groove includes a third accommodating groove surrounded by the first pole part and the second pole part.

[0056] In the above technical solution, the pole body is arranged to be assembled from two parts to define the third accommodating groove by itself, so that the third accommodating groove is facilitated to be obtained.

[0057] In some embodiments, an inner end surface of the pole body includes a fit area participating in defining a groove wall of the accommodating groove, the conductive part connects with the fit area through the accommodating groove, and the fit area is formed as an elongated area extending along a length direction of the first shell wall.

[0058] In the above technical solution, the fit area of the inner end surface of the pole body is relatively large, which is conducive to laying the pole connecting part of the conductive part on the fit area of the inner end surface of the pole body, and is conducive to improving the connection area of the conductive part with the pole body, so as to improve the charging performance.

[0059] In some embodiments, the inner end surface of the pole body includes a matching region participating in defining a groove wall of the accommodation groove, the conductive part includes a tab part and a conductive piece connected with the tab part, and the conductive piece is connected with the matching region through the accommodation groove.

[0060] In the technical solution, the adapter is arranged, so that the form and material of the conductive piece can be flexibly adjusted to adapt to the connection requirements of different positions.

[0061] In some embodiments, the conductive piece includes a first conductive segment laid on the matching region, the conductive piece includes a third conductive segment staggered with the matching region, the third conductive segment protrudes towards the direction of the electrode component relative to the first conductive segment, and the tab part is connected with the third conductive segment.

[0062] In the technical solution, the adapter can meet the connection requirements of the matching region and the tab part.

[0063] In some embodiments, the first shell wall includes a raised structure raised towards the direction away from the electrode component, the raised structure is provided with a mounting hole, the pole component is arranged at the mounting hole and surrounded by the raised structure to form a fourth accommodation groove recessed towards the direction away from the electrode component, and the accommodation groove includes the fourth accommodation groove.

[0064] In the technical solution, the fourth accommodation groove is formed by designing the stepped shape of the first shell wall, so that the design of the pole component can be more diverse.

[0065] In some embodiments, the electrode component includes an active material coated part accommodated in the accommodation cavity, and a tab part connected with the active material coated part, at least part of the tab part is accommodated in the accommodation groove and extends to the pole component and is connected with the pole component.

[0066] In the technical solution, the use of the conductive piece can be omitted, and the connection process of the conductive piece and the tab part can be omitted.

[0067] In some embodiments, the pole component includes a pole body, a side surface of the pole body towards the electrode component is an inner end surface of the pole body, the inner end surface of the pole body participates in surrounding the accommodation groove, the tab part includes a folded part formed by stacking and connecting a plurality of tab sheets, and at least part of the folded part is laid on the inner end surface of the pole body and connected with the inner end surface of the pole body.

[0068] In the technical solution, at least part of the folded part is laid on the inner end surface of the pole body and connected with the inner end surface of the pole body, so as to facilitate increasing the connection area, connection reliability and current carrying capacity of the tab part and the pole body.

[0069] In some embodiments, the folded part is completely laid on the inner end surface of the pole body.

[0070] In the technical scheme, the folding part can be in a completely flat state, and the projection of the folding part completely falls on the inner end surface of the pole body, so that the folding part is not damaged due to bending, the charging performance of the tab part is improved, the connection area between the inner end surface of the pole body and the folding part is improved, the current passing efficiency is improved, the folding part is compressed by the welding nozzle, and the connection reliability of the folding part and the pole body is improved.

[0071] In some embodiments, the electrode component includes an active material coated part accommodated in the accommodation cavity, and a tab part connected to the active material coated part, the conductive part includes a conductive piece and the tab part, and the tab part is connected to the pole component through the conductive piece, and at least part of the conductive piece is accommodated in the accommodation groove.

[0072] In the technical scheme, the tab part is indirectly connected to the pole component through the conductive piece, the length of the tab part is shortened, the problems such as wrinkling, bending and breaking of the tab sheet are improved, the shape and material of the conductive piece can be flexibly designed, the connection difficulty of the conductive piece and the pole component is reduced, and the connection convenience and reliability of the conductive piece and the pole component are improved.

[0073] In some embodiments, the conductive piece includes a first connecting section, the first connecting section includes two clamping parts, the tab part includes a tab end part, and the tab end part is clamped between the two clamping parts and connected to the clamping parts.

[0074] In the technical scheme, the two clamping parts can be used to limit the tab end part, and the connection reliability of the multiple tab sheets in the tab end part is improved. In addition, in some examples, by providing the two clamping parts, the tab end part clamped between the two clamping parts can be in a laminated state, and the step of connecting the multiple tab sheets in the laminated part to form the folding part can be omitted, thereby simplifying the processing procedure and improving the processing efficiency.

[0075] In some embodiments, the pole component includes a pole body, a surface of one end of the pole body facing the electrode component is an inner end surface of the pole body, the conductive piece includes a second connecting section, the second connecting section is laid on and connected to the inner end surface of the pole body, the conductive piece is bent at the connection position of the first connecting section and the second connecting section, so that the first connecting section is located on the side of the second connecting section away from the pole body, and one of the clamping parts supports the side of the tab end part away from the pole body.

[0076] In the technical scheme, the tab part is supported by the clamping part, the redundancy of the tab part is improved, the risk of short circuit caused by the tab part inserted into the active material coated part is reduced, the bent conductive piece can play a buffering support role, the risk of the electrode component impacting the first shell wall is reduced, and the reliability of the battery monomer is improved.

[0077] In some embodiments, the tab part includes a gathered part formed by stacking and connecting multiple tab sheets, the conductive part includes a first connecting segment, and the gathered part is stacked on one side of the first connecting segment in the thickness direction of the first connecting segment and connected with the first connecting segment.

[0078] In the above technical solution, the first connecting segment is in the form of a sheet, the thickness direction of the first connecting segment is consistent with the thickness direction of the gathered part, and the two are stacked along the thickness direction of the first connecting segment, so that the matching mode of the gathered part and the conductive part is simple, which is conducive to improving the production efficiency.

[0079] In some embodiments, the tab part includes a gathered part formed by stacking and connecting multiple tab sheets, the conductive part includes a first connecting segment, and the gathered part is stacked on one side of the first connecting segment in the thickness direction of the first connecting segment and connected with the first connecting segment.

[0080] In the above technical solution, the first connecting segment is in the form of a sheet, the thickness direction of the first connecting segment is consistent with the thickness direction of the gathered part, and the two are stacked along the thickness direction of the first connecting segment, so that the matching mode of the gathered part and the conductive part is simple, which is conducive to improving the production efficiency.

[0081] In some embodiments, the tab part includes a gathered part formed by stacking and connecting multiple tab sheets, the conductive part includes a first connecting segment, and the gathered part is stacked on one side of the first connecting segment in the thickness direction of the first connecting segment and connected with the first connecting segment.

[0082] In the above technical solution, the first connecting segment is in the form of a sheet, the thickness direction of the first connecting segment is consistent with the thickness direction of the gathered part, and the two are stacked along the thickness direction of the first connecting segment, so that the matching mode of the gathered part and the conductive part is simple, which is conducive to improving the production efficiency.

[0083] In some embodiments, the tab part includes a gathered part formed by stacking and connecting multiple tab sheets, the conductive part includes a first connecting segment, and the gathered part is stacked on one side of the first connecting segment in the thickness direction of the first connecting segment and connected with the first connecting segment.

[0084] In the above technical solution, the first connecting segment is in the form of a sheet, the thickness direction of the first connecting segment is consistent with the thickness direction of the gathered part, and the two are stacked along the thickness direction of the first connecting segment, so that the matching mode of the gathered part and the conductive part is simple, which is conducive to improving the production efficiency.

[0085] In some embodiments, the electrode component includes a plurality of electrode assemblies arranged in a stack, and the tabs of the plurality of electrode assemblies are gathered towards the direction of the accommodation groove.

[0086] In the above technical solution, the accommodation groove can accommodate the conductive part to a greater extent, which can further reduce the space occupation of the conductive part in the accommodation cavity, and can improve the energy density of the battery monomer.

[0087] In some embodiments, the shell component includes a shell body participating in enclosing the accommodation cavity, the shell body is a semi-closed cylinder and has an opening at one end, and the end of the shell body opposite to the opening serves as the first shell wall, or the shell component includes a shell cover participating in enclosing the accommodation cavity, the shell cover is a plate and serves as the first shell wall.

[0088] In the above technical solution, the structure of the shell component is flexible, and the arrangement position of the pole column component is flexible. In addition, when the end of the shell body opposite to the opening serves as the first shell wall, the electrode component accommodated in the shell component is connected with the pole column component mounted on the first shell wall. When the battery is vibrated or deformed, the pole column components connected by the busbar component will pull each other. Since the pole column components are arranged on the end wall of the shell body opposite to the opening, the force acting on the pole column components will be preferentially transmitted to the shell body, and will not directly act on the shell cover. Therefore, not only can the distance of the force transmission to the welding seam of the shell body and the shell cover be prolonged, but also the shell body will preferentially deform when subjected to force, so as to reduce the stress at the welding seam of the shell body and the shell cover, thereby effectively reducing the cracking probability of the welding seam of the shell body and the shell cover during the use of the battery, and improving the reliability of the battery monomer. Moreover, since the connection position of the shell body and the shell cover is not prone to cracking, the wall thickness of the shell body and the shell cover does not need to be increased to increase the connection reliability, thereby facilitating the reduction of weight and material cost, and facilitating the miniaturization of the battery monomer or the improvement of the energy density of the battery monomer.

[0089] In some embodiments, the battery monomer further includes a pressure relief device, and the pressure relief device is arranged on the same side or different side of the pole column component.

[0090] In the above technical solution, when the pressure relief device is on the same side of the pole column component, the design of other shell walls except the first shell wall can be simplified, and the structure and processing of the battery monomer can be simplified. When the pressure relief device is on the different side of the pole column component, the space of the first shell wall occupied by the pressure relief device does not need to be considered, and the volume of the pole column component can be reduced, thereby the shape and volume of the pole column component can be flexibly designed according to the needs.

[0091] In a second aspect, the embodiments of the present application also provide a battery including the battery monomer of any of the above-mentioned solutions.

[0092] In the technical solution, the energy density of the battery cell is improved, so that the energy density of the battery is improved.

[0093] In some embodiments, the battery comprises a box body, the battery cell is multiple and is accommodated in the box body, a bottom of the box body is a box bottom plate, 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.

[0094] In the 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; therefore, the orientation of the battery cell and the box body can be flexibly arranged.

[0095] In the third aspect, the embodiments of the present application also provide a power utilization device comprising the battery of any of the above-mentioned solutions.

[0096] In the technical solution, the performance of the battery is improved, so that the working power performance of the power utilization device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0097] 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 below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0098] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0099] FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

[0100] FIG. 3 is a structural schematic diagram of a battery cell according to some embodiments of the present application;

[0101] FIG. 4 is a sectional view of the battery cell according to some embodiments of the present application;

[0102] FIG. 5 is a partial enlarged view of FIG. 4;

[0103] FIG. 6 is a top view of the battery cell according to some embodiments of the present application;

[0104] FIG. 7 is a sectional view along line A-A in FIG. 6;

[0105] FIG. 8 is a schematic diagram of a pole part according to some embodiments of the present application;

[0106] Fig. 9 is a plan view of the pole piece member shown in Fig. 8;

[0107] Fig. 10 is a view in the direction B shown in Fig. 9;

[0108] Fig. 11 is a sectional view along the line C-C shown in Fig. 9;

[0109] Fig. 12 is a front view of a battery cell employing the pole piece member shown in Fig. 11;

[0110] Fig. 13 is a plan view of the battery cell shown in Fig. 12;

[0111] Fig. 14 is a side view of the battery cell shown in Fig. 12, in which the dotted lines indicate the electrode members inside the case;

[0112] Fig. 15 is a sectional view of a pole piece member according to some embodiments of the present application;

[0113] Fig. 16 is a sectional view of a pole piece member according to some embodiments of the present application;

[0114] Fig. 17 is a sectional view of a pole piece member according to some embodiments of the present application;

[0115] Fig. 18 is a sectional view of a pole piece member according to some embodiments of the present application;

[0116] Fig. 19 is a sectional view of a pole piece member according to some embodiments of the present application;

[0117] Fig. 20 is a sectional view of a pole piece member according to some embodiments of the present application;

[0118] Fig. 21 is a partial sectional view of a battery cell according to some embodiments of the present application;

[0119] Fig. 22 is a partial sectional view of a battery cell according to some embodiments of the present application;

[0120] Fig. 23 is a partial sectional view of a battery cell according to some embodiments of the present application;

[0121] Fig. 24 is a partial sectional view of a battery cell according to some embodiments of the present application;

[0122] Fig. 25 is a partial sectional view of a battery cell according to some embodiments of the present application;

[0123] Fig. 26 is a partial sectional view of a battery cell according to some embodiments of the present application;

[0124] Fig. 27 is a partial sectional view of a battery cell according to some embodiments of the present application;

[0125] FIG. 28 is a partial cross-sectional view of a battery cell, according to some embodiments of the present application;

[0126] FIGS. 29A-29D are exploded views of a battery cell, according to one embodiment of the present application;

[0127] FIGS. 30A-30C are exploded views of a battery cell, according to one embodiment of the present application;

[0128] FIG. 31 is an exploded view of a battery cell, according to some embodiments of the present application.

[0129] Reference Signs: vehicle 1000; battery 100; controller 200; motor 300; box body 101; first box portion 1011; second box portion 1012; battery cell 102; first direction F1; second direction F2; third direction F3; fourth direction F4; fifth direction F5; shell member 1; shell body 11; first shell wall 111; inner end surface of shell wall 1110; protruding structure 1114; mounting hole 112; opening 113; second shell wall 114; shell cover 12; accommodating cavity 13; sealing ring 14; pole column member 2; pole column body 21; inner end surface of pole column body 211; fitting region 211a; peripheral portion 212; penetrating portion 214; riveting portion 2141; inner limiting portion 215; outer limiting portion 216; first pole column member 21a; second pole column member 21b; fitting hole 21b1; first adapter structure 22a; surrounding portion 22a1; inner end surface of first adapter structure 220; surrounding region 2201; first adapter ring 221; first step portion 2211; second adapter ring 222; stop ring portion 2221; third adapter ring 223; first extension portion 2231; second extension portion 2232; second step portion 2233; first insulation structure 23a; sealing structure member 231; first insulation member 232; second insulation member 234; second adapter structure 22b; second insulation structure 23b; fourth adapter ring 227; fitting ring portion 2271; third step portion 2273; third insulation structure 23c; first insulation bracket 241; electrode member 3; electrode assembly 31; tab 311; laminated portion 312; gathered portion 313; active material coating portion 32; tab portion 33; tab end portion 331; conductive member 4; conductive member 41; first connecting segment 411; clamping portion 4110; second connecting segment 412; first conductive segment 415; second conductive segment 416; third conductive segment 417; open slot 42; accommodating slot 5; slot top wall 50; first accommodating slot 51; base slot 511; first recess 512; second recess 513; second accommodating slot 52; third accommodating slot 53; fourth accommodating slot 54; pressure relief device 6. DETAILED DESCRIPTION

[0130] So that the purposes, technical solutions and advantages of the embodiments of the present application are more apparent, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all 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 scope of protection of the present application.

[0131] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing 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, rather than to describe a particular order or primary and secondary relationship.

[0132] In the present application, the term "embodiment" means that the specific features, structures or properties described in conjunction 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 refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0133] 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.

[0134] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents a "or" relationship between the front and rear associated objects.

[0135] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0136] In this application, "multiple" means two or more, including two.

[0137] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, or solid-state batteries, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0138] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. Exemplarily, a battery may include a housing for encapsulating one or more battery cells, or one or more battery modules, the housing preventing liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0139] A single battery cell includes a casing, electrode components, and an electrolyte (which may be a solid electrolyte layer located between the positive and negative electrodes in a solid-state battery). The electrode components include at least one electrode assembly, and both the electrode assembly and the electrolyte are housed within the casing. The electrode assembly includes a positive electrode, a negative electrode, and a separator (this structure can be omitted in solid-state batteries). The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0140] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0141] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP, polypropylene, PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of this application has a wound or stacked structure.

[0142] In the related art, during manufacturing, the tab portion of the electrode assembly is connected with the pole, to ensure normal charging and discharging operation. The tab portion is stacked between the active material coating portion and the pole, and occupies a large space. When the size of the shell is fixed, the size of the active material coating portion cannot be increased, which makes it difficult to improve the energy density of the battery cell. Moreover, when the length of the tab portion is long, if the space between the active material coating portion and the pole is small, the electrode assembly has a redundant tab portion after entering the shell, which is easy to cause the tab portion to be short-circuited with the active material coating portion, and affects the reliability and stability of the battery cell.

[0143] Therefore, in the embodiments of the present application, the accommodation groove is formed at the pole component and is in communication with the accommodation cavity. The accommodation groove is open toward the direction of the electrode component, and is at least partially surrounded by the pole component. At least part of the conductive portion is accommodated in the accommodation groove. In this way, by arranging the accommodation groove to accommodate the conductive portion, the space of the conductive portion in the accommodation cavity can be reduced, so that the accommodation cavity has more space to accommodate the active material coating portion, which is beneficial to increase the volume of the active material coating portion, thereby increasing the energy density of the battery cell. Moreover, since the accommodation groove is open toward the direction of the electrode component, the conductive portion can easily extend into the accommodation groove, which reduces the operation difficulty.

[0144] 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.

[0145] 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 an extended range electric 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.

[0146] In the following embodiments, the electric device is taken as a vehicle for example for convenience of description.

[0147] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. 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.

[0148] 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 startup, navigation, and driving.

[0149] 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.

[0150] Referring to FIG. 2, which is an exploded view of the battery 100 according to some embodiments of the present application, the battery 100 includes a battery cell 102 and a box 101 for accommodating the battery cell 102. The box 101 can be of various structural forms.

[0151] 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 FIG. 2, the first box portion 1011 and the second box portion 1012 can each be a hollow structure with one open side, and the open side of the first box portion 1011 covers 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 that can cover 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.

[0152] 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 connection, where the mixed connection means that the multiple battery cells 102 are connected in series and in parallel. The multiple battery cells 102 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 102 is accommodated in the box 101; of course, the multiple battery cells 102 can first be connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is 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.

[0153] Please refer to FIG. 3, which is a structural schematic diagram of the battery monomer 102 provided by some embodiments of the present application. The battery monomer 102 is in the form of a cuboid, the height direction of the battery monomer 102 is the first direction F1, the thickness direction of the battery monomer 102 is the second direction F2, and the width direction of the battery monomer 102 is the third direction F3, and the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other in pairs.

[0154] Please refer to FIG. 4-FIG. 7, FIG. 4 is a sectional view of the battery monomer 102 provided by some embodiments of the present application, FIG. 5 is a partial enlarged view of FIG. 4, FIG. 6 is a top view of the battery monomer 102 provided by some embodiments of the present application, and FIG. 7 is a sectional view along the line A-A in FIG. 6.

[0155] In combination with FIG. 4, the battery monomer 102 can include a shell component 1, a pole component 2 and an electrode component 3.

[0156] In combination with FIG. 4 and FIG. 5, the pole component 2 is installed on the shell component 1. Exemplarily, the shell component 1 has a receiving cavity 13 therein, the shell component 1 includes a first shell wall 111 participating in surrounding the receiving cavity 13, the first shell wall 111 has a mounting hole 112 thereon, the pole component 2 is installed on the first shell wall 111 and arranged at the mounting hole 112. Wherein, “the pole component 2 is installed on 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 shell component 1 and the pole component 2 are respectively separate components, and the two are assembled and connected, so that the shell component 1 can be processed separately, and the pole component 2 can be processed separately, thereby facilitating the processing of the two, and being beneficial to the processing and manufacturing of the battery monomer 102.

[0157] In combination with FIG. 4 and FIG. 5, the electrode component 3 is received in the shell component 1. Exemplarily, the electrode component 3 includes an active material coating part 32 and a tab part 33, the active material coating part 32 is received in the receiving cavity 13, and the tab part 33 is connected with the active material coating part 32. The electrode component 3 includes one or more electrode assemblies 31, the part of the current collector coated with the active material layer in the electrode assembly 31 constitutes the active material coating part 32, and the part not coated with the active material layer constitutes the tab part 33, and the tab part 33 includes multiple tab pieces 311.

[0158] 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.

[0159] Exemplarily, the shell part 1 can be surrounded by different wall surfaces, one of which is the first shell wall 111. The projection plane perpendicular to the penetration direction of the installation hole 112 is taken as the projection plane. The orthogonal projection of the installation hole 112 on the projection plane completely falls within the orthogonal projection of the first shell wall 111 on the projection plane, and the orthogonal projection area of the installation hole 112 is smaller than the orthogonal 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.

[0160] In combination with FIGS. 5 and 7, 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 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 electrical conduction, so that multiple battery monomers 102 can be connected through the busbar part.

[0161] 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, so as to be easily connected with the aluminum busbar part, and the copper part is easily connected with the copper foil tab of the negative electrode. When the pole part 2 is a positive electrode, the pole body 21 can be an aluminum part, which is easily connected with the aluminum busbar part and is also easily connected with the aluminum foil tab of the positive electrode.

[0162] The connection mode of the conductive part 4 with the pole part 2 is not limited, for example, can include, but is not limited to, ultrasonic welding, combination of ultrasonic pre-welding and laser welding, resistance welding, pressure fusion welding, brazing, cementation, etc.

[0163] For example, referring to FIG. 5, the conductive part 4 can simultaneously include the tab part 33 and the conductive piece 41 connected with the tab part 33, the tab part 33 being indirectly connected with the pole body 21 through the conductive piece 41. The conductive piece 41 can belong to the electrode component 3, or the conductive piece 41 can belong to the pole component 2, or the conductive piece 41 can be independent of the electrode component 3 and the pole component 2.

[0164] In this way, by indirectly connecting the tab part 33 with the pole body 21 through the conductive piece 41, the length of the tab part 33 can be shortened, and the problems such as wrinkling, bending and breaking of the tab sheet 311 can be improved. In addition, by flexibly designing the shape and material of the conductive piece 41, the connection difficulty with the pole body 21 can be reduced, and the connection convenience of the conductive piece 41 with the pole body 21 can be improved.

[0165] For example, referring to FIG. 7, the conductive part 4 includes the tab part 33 and is connected with the pole body 21 through the tab part 33, that is, the conductive piece 41 is not needed, and the tab part 33 can be directly connected with the pole body 21. In this way, the use of the conductive piece 41 can be saved, and the connection process of the conductive piece 41 with the tab part 33 can be saved.

[0166] An insulating material piece is arranged between the pole body 21 and the first shell wall 111 to realize the insulation between the first shell wall 111 and the pole body 21, so as to avoid the electrification of the first shell wall 111. For example, the insulating material piece can be part of the pole component 2 (for example, the first insulating structure 23a, the second insulating structure 23b, or the third insulating structure 23c), or for example, the insulating material piece can be arranged between the pole component 2 and the shell component 1.

[0167] The structure of the shell component 1 is not limited. For example, the shell component 1 includes a shell body 11 participating in surrounding the accommodating cavity 13, one end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, or the shell component 1 includes a shell cover 12 participating in surrounding the accommodating cavity 13, and the shell cover 12 is the first shell wall 111. In this way, the structure design of the shell component 1 is flexible, and the arrangement position of the pole component 2 is flexible.

[0168] When the shell cover 12 is the first shell wall 111, for example, in combination with FIGS. 6 and 7, the shell component 1 can include the shell body 11 and the shell cover 12, one end of the shell body 11 has the opening 113, and the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 jointly surround the accommodating cavity 13, and the shell cover 12 serves as the first shell wall 111; or for example, the shell component 1 can include the shell body 11 and two shell covers 12, both ends of the shell body 11 have the openings 113, and each opening 113 is covered by the shell cover 12, the two shell covers 12 and the shell body 11 jointly surround the accommodating cavity 13, and one of the two shell covers 12 serves as the first shell wall 111.

[0169] When the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, the shell member 1 may, for example, in combination with FIG. 4 and FIG. 5, comprise the shell body 11 and the shell cover 12, the shell body 11 has the opening 113 at one end, and the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 jointly enclose the accommodation cavity 13, and the end of the shell body 11 opposite to the opening 113 is the first shell wall 111; or, for example, the shell member 1 may comprise two shell bodies 11, each of which has the opening 113 at one end, 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 enclose the accommodation cavity 13, and the end of one of the shell bodies 11 opposite to the opening 113 is the first shell wall 111.

[0170] In some embodiments of the present application, in combination with FIG. 4 and FIG. 5, the shell member 1 comprises the shell body 11 which participates in enclosing the accommodation cavity 13, the shell body 11 has the opening 113 at one end, and the end of the shell body 11 opposite to the opening 113 is 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 comprises the first shell wall 111 and the 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 the 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 the cavity, which constitutes at least part of the accommodation cavity 13.

[0171] When the shell member 1 comprises the shell body 11 having the opening 113 at one end, the shell member 1 further comprises a mating shell which mates 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 a one-piece member and is in the form of a semi-closed cylinder, and the mating shell is in the form of a flat plate, i.e., the mating shell can be the shell cover 12, at this time, the shell member 1 can be in the form of a combination of the shell body 11 and the shell cover 12, and for another example, the shell body 11 is in the form of a semi-closed cylinder, at this time, the shell member 1 can be in the form of a combination of two semi-closed cylinders with openings opposite to each other. In this way, the shell member has various forms and can adapt to various application scenarios.

[0172] In the above technical solution, since the electrode component 3 accommodated in the shell component 1 is connected with the pole column component 2 mounted on the first shell wall 111, when the battery 100 is vibrated or deformed, the pole column components 2 connected by the busbar component will be pulled by each other. Since the pole column component 2 is arranged on the end wall opposite to the opening 113 of the shell body 11, the force acting on the pole column component 2 will be preferentially transmitted to the shell body 11, and will not directly act on the matched shell (for example, the shell cover 12), thereby not only prolonging the distance of force transmission to the connection between the shell body 11 and the matched shell (for example, the shell cover 12), but also preferentially deforming the shell body 11 when force is applied, so as to reduce the force at the connection between the shell body 11 and the matched shell (for example, the shell cover 12), thereby effectively reducing the probability of cracking at the connection between the shell body 11 and the matched shell (for example, the shell cover 12) during use of the battery 100, and improving the reliability of the battery monomer 102. Moreover, since the connection position of the shell body 11 and the matched shell (for example, the shell cover 12) is not prone to cracking, it is not necessary to increase the wall thickness of the two in order to increase the connection reliability of the two, thereby facilitating the reduction of weight and material cost, and facilitating the miniaturization of the battery monomer 102 or the improvement of the energy density of the battery monomer 102. The connection manner of the shell body 11 and the matched shell is not limited, for example, can be adhesion, welding, etc.

[0173] Exemplarily, when the end wall opposite to the opening 113 of the shell body 11 serves as the first shell wall 111 for mounting the pole column component 2, if the pole column component 2 is first mounted at the mounting hole 112 of the first shell wall 111, and then the electrode component 3 is assembled into the shell body 11, it is difficult to connect the electrode component 3 and the pole column component 2. In some embodiments of the present application, the connection of the electrode component 3 and the pole column component 2 can be performed first, and then the pole column component 2 is assembled and connected to the shell component 1, thereby meeting the connection requirements of the electrode component 3 and the pole column component 2, and also meeting the connection requirements of the pole column component 2 and the shell component 1, thereby improving the reliability and processability of the battery monomer 102. Moreover, such a processing sequence can effectively shorten the length of the conductive part 4, for example, as long as the first connection of the electrode component 3 and the pole column component 2 and the second connection of the pole column component 2 and the shell component 1 can be met, thereby saving the material and cost of the conductive part 4, reducing the redundancy of the conductive part 4, reducing the short circuit risk, and reducing the space occupation of the conductive part 4 in the shell component 1, thereby facilitating the improvement of the energy density of the battery monomer 102.

[0174] The material of the shell component 1 is not limited, for example, including but not limited to aluminum shell, steel shell, aluminum plastic film, plastic or other electrolyte corrosion resistant materials.

[0175] In some embodiments of the present application, referring to Fig. 7 again, the pole part 2 is provided with a receiving groove 5 which is open towards the direction of the electrode part 3 (i.e. towards the direction of the active material coating part 32, or in other words, towards the inner side), so as to communicate with the receiving cavity 13, and at least part of the receiving groove 5 is enclosed by the pole part 2, and at least part of the conductive part 4 is received in the receiving groove 5.

[0176] In the above technical solution, at least part of the receiving groove 5 is enclosed by the pole part 2, which means that at least part of the groove wall of the receiving groove 5 is formed by the pole part 2. For example, the receiving groove 5 can be enclosed by the pole part 2 only, so that all the groove walls of the receiving groove 5 are formed by the pole part 2. Alternatively, for example, the receiving groove 5 can be enclosed by the pole part 2 and the first shell wall 111 together, so that the groove walls of the receiving groove 5 are formed by the pole part 2 and the first shell wall 111 together respectively.

[0177] Therefore, by providing the receiving groove 5 to receive the conductive part 4, the space occupied by the conductive part 4 in the receiving cavity 13 can be reduced, so that the receiving cavity 13 has more 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 monomer 102. Moreover, since the receiving groove 5 is open towards the direction of the electrode part 3, the conductive part 4 can easily extend into the receiving groove 5, thereby reducing the operation difficulty. In addition, the first shell wall 111 and the pole part 2 are arranged on the same side of the electrode part 3, which can shorten the installation distance of the pole part 2 and improve the reliability of the battery monomer 102.

[0178] In some embodiments of the present application, referring to Fig. 7 again, the receiving groove 5 is recessed relative to the first shell wall 111 and away from the direction of the electrode part 3. In the above technical solution, at least part of the receiving groove 5 protrudes out of the first shell wall 111 towards the outer side, so that the space occupied by the conductive part 4 in the receiving cavity 13 can be further reduced, so that the receiving cavity 13 has more 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 monomer 102.

[0179] Exemplarily, the side surface of the first shell wall 111 facing the electrode component 3 is an inner end surface 1110 of the shell wall, and the accommodation groove 5 is recessed relative to the inner end surface 1110 of the shell wall in a direction away from the electrode component 3. The side groove wall of the accommodation groove 5 away from the electrode component 3 (i.e., the side wall surface away from the active material coated portion 32) is a groove top wall 50, the side surface of the first shell wall 111 facing the electrode component 3 (i.e., the side wall surface facing the active material coated portion 32) is the inner end surface 1110 of the shell wall, and the accommodation groove 5 is recessed relative to the inner end surface 1110 of the shell wall in a direction away from the electrode component 3 (i.e., in a direction away from the active material coated portion 32, i.e., recessed towards the outside), so that the groove top wall 50 of the accommodation groove 5 is further away from the electrode component 3 than the inner end surface 1110 of the shell wall.

[0180] In the technical solution described above, at least part of the accommodation groove 5 protrudes towards the outside beyond the plane where the inner end surface 1110 of the shell wall is located, so that the space occupied by the conductive portion 4 in the accommodation cavity 13 can be further reduced, and the accommodation cavity 13 has a larger space to accommodate the active material coated portion 32, which is beneficial to increasing the volume of the active material coated portion 32, thereby increasing the energy density of the battery monomer 102.

[0181] In some embodiments of the present application, please refer to FIG. 7 again, the pole component 2 includes a pole body 21 connected with the conductive portion 4, and the side surface of the pole body 21 facing the electrode component 3 is an inner end surface 211 of the pole body 21, and the inner end surface 211 of the pole body 21 participates in surrounding the accommodation groove 5.

[0182] In the technical solution described above, at least part of the accommodation groove 5 is surrounded by the side surface of the pole body 21 facing the electrode component 3, and the conductive portion 4 received in the accommodation groove 5 can easily contact and connect to the pole body 21, improving the connection convenience and simplifying the structure.

[0183] Exemplarily, the side groove wall of the accommodation groove 5 away from the electrode component 3 (i.e., the side wall surface away from the active material coated portion 32) is a groove top wall 50, the side surface of the pole body 21 facing the electrode component 3 (i.e., the side surface facing the active material coated portion 32) is the inner end surface 211 of the pole body 21, and the inner end surface 211 of the pole body 21 constitutes at least part of the groove top wall 50 of the accommodation groove 5. That is, at least part of the inner end surface 211 of the pole body 21 participates in defining the groove top wall 50 of the accommodation groove 5, or in other words, the inner end surface 211 of the pole body 21 includes a cooperation area 211a participating in defining the groove top wall 50 of the accommodation groove 5. The electrode component 3 is connected with the cooperation area 211a.

[0184] Exemplarily, when at least part of the conductive part 4 is accommodated in the accommodation groove 5, a pole connecting part (e.g. the converging part 313 of the tab part 33 or the second connecting segment 412 or the first conductive segment 415 of the conductive piece 41) of the conductive part 4 (e.g. the tab part 33 or the conductive piece 41) can be laid on the inner end face 211 of the pole body 21 and connected with the inner end face 211 of the pole body 21. During processing, the pole connecting part of the conductive part 4 can be first fitted into the accommodation groove 5, and then laid on the inner end face 211 of the pole body 21 and connected with the inner end face 211 of the pole body 21.

[0185] Exemplarily, the conductive part 4 can include a pole connecting part, which can be a relatively hard plate shape, such as the converging part 313 of the tab part 33 (e.g. an ultrasonic welding mark) or the second connecting segment 412 (e.g. a metal sheet) or the first conductive segment 415 (e.g. a metal sheet) of the conductive piece 41, which will not be deformed downward under the action of gravity.

[0186] The accommodation groove 5 can be flexibly designed and constructed, where the accommodation groove 5 is not limited to being at least partially surrounded by the pole part 2 alone, or at least partially surrounded by the housing part 1 and the pole part 2 together.

[0187] Please refer to FIGS. 8-14, FIG. 8 is a schematic view of a pole part according to some embodiments of the present application; FIG. 9 is a top view of the pole part shown in FIG. 8; FIG. 10 is a view along the direction B shown in FIG. 9; FIG. 11 is a sectional view along the line C-C shown in FIG. 9; FIG. 12 is a front view of a battery cell using the pole part shown in FIG. 11; FIG. 13 is a top view of the battery cell shown in FIG. 12; and FIG. 14 is a side view of the battery cell shown in FIG. 12.

[0188] Please refer to FIGS. 8-14 again. In some embodiments of the present application, the pole part 2 includes a pole body 21, a first adapter structure 22a surrounding the pole body 21 and connected with the first housing wall 111, and a first insulating structure 23a insulatingly and sealingly fitted between the first adapter structure 22a and the pole body 21, the conductive part 4 is connected with the pole body 21, and the accommodation groove 5 includes a first accommodation groove 51 surrounded by the pole part 2.

[0189] The first adapter structure 22a circumferentially surrounds the pole body 21 along the circumference of the mounting hole 112, so that the first adapter structure 22a can connect the pole body 21 and the first shell wall 111 at the outer circumferential region of the pole body 21. The first insulation structure 23a insulates the first adapter structure 22a from the pole body 21 and forms a sealed state at the matching position of the first adapter structure 22a and the pole body 21, so as to isolate the inside and outside of the shell component 1 after the first adapter structure 22a is connected to the first shell wall 111, reduce the risk of leakage of the electrolyte in the shell component 1 to the outside of the shell component 1 from the matching position of the first adapter structure 22a and the pole body 21, and reduce the risk of liquid or dust outside the shell component 1 entering the shell component 1 from the matching position of the first adapter structure 22a and the pole body 21, thereby improving the reliability of the battery cell 102. The connection mode of the first adapter structure 22a and the first shell wall 111 is not limited, for example, can be welded, riveted, punched, bonded, etc.

[0190] In the above technical solution, since the pole component 2 includes the first adapter structure 22a connected to the first shell wall 111 in addition to the pole body 21, and the first insulation structure 23a is arranged between the first adapter structure 22a and the pole body 21 to play an insulation and sealing role, when the pole component 2 is installed to the first shell wall 111 and the first adapter structure 22a is connected to the first shell wall 111, no sealing member needs to be arranged between the first adapter structure 22a and the first shell wall 111, and no large sealing pressure needs to be applied to meet the compression degree of the sealing member, thereby reducing the stress on the first shell wall 111 and playing a role in protecting the shell component 1, thereby facilitating the reduction of the wall thickness of the shell component 1 and the reduction of the material cost. In addition, when the first shell wall 111 is the end of the shell body 11 opposite to the opening 113, the stress at the connection between the first shell wall 111 and the second shell wall 114 can be reduced, and the stress on the second shell wall 114 can be reduced, thereby facilitating the reliability of the shell body 11 and the reduction of the wall thickness and cost of the shell body 11. Moreover, the pole component 2 in this structure forms the first accommodating groove 51, which facilitates flexible processing of the first accommodating groove 51 and easy design of the shape and volume of the first accommodating groove 51.

[0191] For example, when the pole component 2 is delivered or after the pole component 2 is processed, the pole component 2 can be subjected to airtightness detection to determine whether the connection position of the first adapter structure 22a and the pole body 21 forms a reliable seal, and if the seal is reliable, the first adapter structure 22a can be connected to the first shell wall 111.

[0192] The shape of the first adapter structure 22a and the pole body 21 is not limited, for example, either of them can be processed into a circular, oval, rectangular, R-cornered rectangular, etc.

[0193] In some embodiments of the present application, the outer contour of the orthographic projection of the first accommodating groove 51 on the first shell wall 111 (corresponding to the orthographic projection of the first accommodating groove 51 on a projection plane perpendicular to the wall thickness direction of the first shell wall 111) is located at the outer periphery of the orthographic projection of the pole body 21 on the first shell wall 111 (corresponding to the orthographic projection of the pole body 21 on a projection plane perpendicular to the wall thickness direction of the first shell wall 111).

[0194] Thus, by setting the orthographic projection of the pole body 21 on the first wall 111 to fall within the outer contour of the orthographic projection of the first accommodating groove on the first wall, the range of the first accommodating groove 51 is larger, which is conducive to accommodating the conductive part 4 to a greater extent and facilitating the connection of the conductive part 4 with the pole body 21.

[0195] Please refer to Figs. 8-14 again. Exemplarily, the first accommodating groove 51 is formed on the side of the pole body 21 and the first adapter structure 22a facing the electrode component 3 (i.e., the side facing the active material coating part 32).

[0196] Thus, since the first accommodating groove 51 includes both the part formed on the inner side of the pole body 21 (i.e., the side close to the active material coating part 32) and the part formed on the inner side of the first adapter structure 22 (i.e., the side close to the active material coating part 32), the orthographic projection of the pole body 21 on the first wall 111 can fall within the outer contour of the orthographic projection of the first accommodating groove 51 on the first wall 111, so that the first accommodating groove 51 is easy to process.

[0197] Please refer to Figs. 8-14 again. Exemplarily, the first adapter structure 22a is raised relative to the first shell wall 111 in a direction away from the electrode component 3, so that the first accommodating groove 51 is recessed relative to the first shell wall 111 in a direction away from the electrode component 3.

[0198] Thus, by processing the first adapter structure 22a into a raised form protruding outward, a part of the first accommodating groove 51 is formed on the side of the pole body 21 facing the electrode component 3, and another part of the first accommodating groove 51 is formed on the side of the first adapter structure 22a facing the electrode component 3, and the first accommodating groove 51 assumes a shape recessed relative to the first shell wall 111 in a direction away from the electrode component 3, so that the side of the pole body 21 facing the electrode component 3 and the side of the first adapter structure 22a facing the electrode component 3 both have space to accommodate the conductive part 4. In this way, not only is it convenient to accommodate the conductive part 4 to a greater extent, but it is also conducive to the form diversity design of the conductive part 4.

[0199] Exemplarily, the inner end surface 211 of the pole body 21 (i.e. the side surface of the pole body 21 facing the electrode component 3) and the inner end surface 220 of the first adapter structure 22a (i.e. the side surface of the first adapter structure 22a facing the electrode component 3) jointly enclose the first accommodating groove 51. That is, the inner end surface 211 of the pole body 21 can constitute a part of the groove wall of the accommodating groove 5, and the inner end surface 220 of the first adapter structure 22a can constitute the rest of the groove wall of the first accommodating groove 51, so that the first accommodating groove 51 can be enclosed more simply, and the inner end surface 211 of the pole body 21 can constitute a partial groove wall of the first accommodating groove 51, so that the conductive part 4 accommodated in the first accommodating groove 51 can be easily contacted and connected to the pole body 21, improving the connection convenience and simplifying the structure. Alternatively, the first accommodating groove 51 can also be jointly enclosed by the inner end surface 211 of the pole body 21, the inner end surface 220 of the first adapter structure 22a, and the first insulating structure 23a.

[0200] Please refer to FIGS. 8-14 again, the first adapter structure 22a is configured to be raised in a direction away from the electrode component 3 relative to the first shell wall 111, so as to enclose a base groove 511 recessed in the direction away from the electrode component 3 by the first adapter structure 22a, and the first accommodating groove 51 comprises the base groove 511. It is worth mentioning that since the first adapter structure 22a needs to surround the pole body 21, the first adapter structure 22a has a central ring hole, and the part of the base groove 511 opposite to the central ring hole can be occupied by the pole body 21 or not.

[0201] Exemplarily, please refer to FIG. 11, the inner end surface 211 of the pole body 21 and the groove wall enclosing the base groove 511 jointly enclose the first accommodating groove 51. Thus, the first accommodating groove 51 can be enclosed more simply, and the inner end surface 211 of the pole body 21 can constitute a partial top wall 50 of the accommodating groove 5, so that the conductive part 4 accommodated in the accommodating groove 5 can be easily contacted and connected to the pole body 21, improving the connection convenience and simplifying the structure. Alternatively, the first accommodating groove 51 can also be jointly enclosed by the inner end surface 211 of the pole body 21, the groove wall enclosing the base groove 511, and the first insulating structure 23a.

[0202] Please refer to FIG. 9-14 again, exemplary, the first adapter structure 22a comprises a first adapter ring 221 and a second adapter ring 222, the second adapter ring 222 is arranged on the side of the first adapter ring 221 away from the electrode component 3 (i.e. the side away from the active material coating part 32, or the outer side), the outer ring of the first adapter ring 221 is connected with the first shell wall 111, and the inner ring of the first adapter ring 221 and the inner ring of the second adapter ring 222 are clamped together through the first insulating structure 23a to clamp the pole body 21, so as to limit the relative axial movement between the pole body 21 and the first adapter structure 22a. For example, the first adapter ring 221 and the second adapter ring 222 can be welded, riveted, punched, and bonded, for example, the outer ring of the first adapter ring 221 is welded, riveted, punched, and bonded with the first shell wall 111.

[0203] Therefore, the first adapter structure 22a comprises the first adapter ring 221 and the second adapter ring 222 arranged inside and outside and assembled together, so as to facilitate the assembly of the first adapter structure 22a with the first insulating structure 23a and the pole body 21, and make the pole component 2 easy to process and manufacture.

[0204] Exemplary, the first adapter ring 221 and the second adapter ring 222 are both made of aluminum and are welded together, and the first adapter ring 221 and the first shell wall 111 are both made of aluminum and are welded together, thereby facilitating the improvement of the welding yield.

[0205] In combination with FIG. 11-14, in some embodiments of the present application, the first accommodating groove 51 is formed on the side of the first adapter ring 221 and the pole body 21 facing the electrode component 3, the first adapter ring 221 is raised relative to the first shell wall 111 in the direction away from the electrode component 3, so that the first accommodating groove 51 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3, and the second adapter ring 222 is connected with the raised part of the first adapter ring 221. Therefore, by connecting the outer ring of the first adapter ring 221 with the first shell wall 111 and connecting the second adapter ring 222 with the raised part of the first adapter ring 221, the position where the second adapter ring 222 is connected with the first adapter ring 221 (e.g. the first position P1 in FIG. 11) and the position where the first adapter ring 221 is connected with the first shell wall 111 (e.g. the second position P2 in FIG. 11) are both spaced apart in two spatial dimensions (e.g. the horizontal direction and the vertical direction shown in FIG. 11), thereby reducing the thermal influence of the two positions on each other when welded respectively, improving the connection reliability of the second adapter ring 222 with the first adapter ring 221 and the connection reliability of the first adapter ring 221 with the first shell wall 111.

[0206] With reference to FIGS. 11-14, exemplarily, the first adapter ring 221 includes a first stepped portion 2211 protruding from the pole body 21 and towards the first shell wall 111 in a direction away from the electrode component 3, the first stepped portion 2211 forms a raised portion of the first adapter ring 221, the second adapter ring 222 is connected to the first stepped portion 2211, and a base groove 511 is formed on a side of the first stepped portion 2211 facing the electrode component 3 (i.e., a side facing the active material coating portion 32, or in other words, an inner side). Exemplarily, when the first adapter structure 22a only includes the first adapter ring 221 and the second adapter ring 222 (the surface of the first adapter ring 221 can have an insulating layer, or can also be without), the inner end surface of the first adapter ring 221 constitutes the inner end surface 220 of the first adapter structure 22a to participate in the formation of the first accommodating groove 51; and when the first adapter structure 22a further includes a first insulating support 241 mounted on the inner side of the first adapter ring 221 (i.e., the side close to the active material coating portion 32), the inner end surface of the first insulating support 241 constitutes the inner end surface 220 of the first adapter structure 22a to participate in the formation of the first accommodating groove 51.

[0207] When the first adapter structure 22a includes the first adapter ring 221 and the second adapter ring 222, the form of the first insulating structure 23a that plays an insulating and sealing role is not limited. For example, in some embodiments of the present application, with reference to FIG. 11, the pole body 21 includes a peripheral portion 212, which is an outer peripheral structure of the pole body 21, the first insulating structure 23a includes a sealing structure 231 and a first insulating member 232, the sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212, and the second adapter ring 222 is insulated and fixedly fitted to the pole body 21 through the first insulating member 232.

[0208] Thus, since the first insulating structure 23a includes the first insulating member 232 and the sealing structure 231 that are not integrated into one piece, the design and processing of the first insulating structure 23a can be simplified, the processing of the pole component 2 is facilitated, and reliable connection and insulating fitting of the first adapter structure 22a to the pole body 21 can be achieved. Moreover, according to specific fitting requirements of the pole body 21 and the first adapter structure 22a, the first insulating member 232 can be configured as an insulating member (e.g., a plastic member) that is substantially incompressible and does not have a sealing effect, or can also be configured as a sealing member (e.g., an elastic rubber member) that is compressible and has a sealing effect, so as to meet different actual requirements. In addition, when the first insulating member 232 is an insulating member (e.g., a plastic member) that is substantially incompressible and does not have a sealing effect, the compression amount of the sealing structure 231 can be easily controlled, and the sealing effect is improved.

[0209] Exemplarily, the sealing structure 231 is an integrally formed part, thereby facilitating processing and manufacturing, and when the sealing structure 231 comprises multiple parts, the connection of the multiple parts is more reliable.

[0210] Exemplarily, in combination with FIG. 11, the first insulation 232 can be injection-molded between the pole body 21 and the first adapter ring 221, and between the first insulation 232 and the second adapter ring 222. For example, when the pole part 2 is processed, the pole body 21 and the second adapter ring 222 can be injection-molded together first, and then the sealing structure 231 and the first adapter ring 221 are assembled, and then the first adapter ring 221 and the second adapter ring 222 are connected, and the sealing structure 231 is compressed. In this way, the pole body 21 and the second adapter ring 222 can be insulated and fixedly connected through the first insulation 232.

[0211] Alternatively, exemplarily, in combination with FIG. 15, the second adapter ring 222 can comprise a stop ring part 2221, and the first insulation 232 is clamped between the stop ring part 2221 and the peripheral part 212. In this embodiment, the material of the first insulation 232 is not limited, for example, it can be a plastic part or an elastic rubber part, etc. In this way, by connecting the second adapter ring 222 with the first adapter ring 221, the first insulation 232 is clamped by the stop ring part 2221 and the peripheral part 212 of the second adapter ring 222, so that the injection molding process can be omitted.

[0212] Alternatively, exemplarily, in combination with FIG. 16, the first insulation structure 23a comprises an integrally formed sealing structure 231, a part of the sealing structure 231 is clamped between the first adapter ring 221 and the peripheral part 212, and a part of the sealing structure 231 is clamped between the second adapter ring 222 and the peripheral part 212, the first insulation structure 23a has both sealing and insulation properties, thereby simplifying the processing of the first insulation structure 23a.

[0213] In the above technical solution, when the pole body 21 comprises the peripheral part 212, and the first adapter structure 22a clamps the peripheral part 212 through the first insulation structure 23a, at least part of the sealing structure 231 can be clamped on the side of the peripheral part 212 facing the electrode part 3. In this way, the sealing can be performed from the side of the peripheral part 212 close to the accommodation cavity 13, and the leakage of electrolyte from the connection position of the pole body 21 and the first adapter structure 22a can be more effectively inhibited, thereby improving the sealing effect.

[0214] Please refer to FIG. 17 and FIG. 18, FIG. 17 is a sectional view of a pole piece component provided in some embodiments of the present application, and FIG. 18 is a sectional view of a pole piece component provided in some embodiments of the present application. The first adapter structure 22a can also be provided without the first adapter ring 221 and the second adapter ring 222 assembled together.

[0215] For example, in some embodiments of the present application, referring to FIG. 17 and FIG. 18, the first adapter structure 22a includes a third adapter ring 223, the outer ring of the third adapter ring 223 is connected to the first shell wall 111, and the third adapter ring 223 includes a first extension 2231 and a second extension 2232 integrally provided, that is, the first extension 2231 and the second extension 2232 are different parts of one integral piece, rather than two separate parts assembled together. The connection manner of the third adapter ring 223 to the first shell wall 111 is not limited, for example, it can be welding, riveting, punching, bonding, etc. The second extension 2232 is connected to the side of the first extension 2231 away from the electrode component 3 (i.e., the side away from the active material coated portion 32, or the outer side), and the first extension 2231 and the second extension 2232 together hold the pole body 21 through the first insulating structure 23a to limit the relative axial movement of the pole body 21 and the first adapter structure 22a.

[0216] Therefore, since the third adapter ring 223 includes the first extension 2231 and the second extension 2232 integrally provided, the first extension 2231 and the second extension 2232 are integrated into the same structure, thereby the process of connecting the first extension 2231 and the second extension 2232 can be omitted, the use of parts is reduced, the first extension 2231 and the second extension 2232 are not easy to separate, and the holding reliability of the pole body 21 by the first insulating structure 23a can be improved.

[0217] For example, the third adapter ring 223 and the first shell wall 111 are both made of aluminum and are connected by welding, thereby facilitating the improvement of the welding yield.

[0218] In some embodiments of the present application, referring to FIG. 17 and FIG. 18, the first accommodating groove 51 is formed on the side of the third adapter ring 223 and the pole body 21 facing the electrode component 3, and the third adapter ring 223 is raised relative to the first shell wall 111 in the direction away from the electrode component 3, so that the first accommodating groove 51 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3.

[0219] Exemplarily, referring to FIG. 17 and FIG. 18, the third adapter ring 223 comprises a second stepped portion 2232 protruding towards the direction away from the electrode component 3 relative to the first shell wall 111 and encircling the pole body 21, the second stepped portion 2232 forms a raised portion of the third adapter ring 223, and the base groove 511 is formed on the side of the second stepped portion 2232 facing the electrode component 3. Exemplarily, when the first adapter structure 22a only comprises the third adapter ring 223 (for example, the surface of the third adapter ring 223 can have an insulating layer, or can also be without), the inner end surface of the third adapter ring 223 constitutes the inner end surface 220 of the first adapter structure 22a to participate in the enclosure of the first accommodating groove 51; and when the first adapter structure 22a further comprises a second insulating support installed on the inner side of the third adapter ring 223 (i.e. the side close to the active material coating portion 32), the inner end surface of the second insulating support constitutes the inner end surface 220 of the first adapter structure 22a to participate in the enclosure of the first accommodating groove 51.

[0220] When the first adapter structure 22a comprises the third adapter ring 223, the form of the first insulating structure 23a that plays the role of insulation and sealing is not limited. For example, in some embodiments of the present application, in combination with FIG. 17, the pole body 21 comprises a peripheral portion 212 which is an outer peripheral structure of the pole body 21, and the first insulating structure 23a comprises a sealing structure 231 and a first insulating member 232, the sealing structure 231 is clamped between the first extending portion 2231 and the peripheral portion 212, and the first insulating member 232 is clamped between the second extending portion 2232 and the peripheral portion 212.

[0221] Therefore, since the first insulating structure 23a comprises the first insulating member 232 and the sealing structure 231 which are not integrated as one piece, the design and processing of the first insulating structure 23a can be simplified, the processing of the pole component 2 is easy, and reliable connection and insulation cooperation of the first adapter structure 22a with the pole body 21 can be achieved. Moreover, according to the specific cooperation requirements of the pole body 21 and the first adapter structure 22a, the first insulating member 232 can be set as an insulating member (for example, a plastic member) which is substantially incompressible and does not have sealing effect, or the first insulating member 232 can also be set as a sealing member (for example, an elastic rubber member) which is compressible and has sealing effect, so as to meet different actual requirements. In addition, when the first insulating member 232 is an insulating member (for example, a plastic member) which is substantially incompressible and does not have sealing effect, the compression amount of the sealing structure 231 is easy to control, and the sealing effect is improved.

[0222] Exemplarily, in combination with FIG. 18, the first insulating structure 23a includes a sealing structure 231 integrally formed, and a portion of the sealing structure 231 is clamped between the first extension 2231 and the peripheral portion 212, and a portion of the sealing structure 231 is clamped between the second extension 2232 and the peripheral portion 212. The first insulating structure 23a has both sealing and insulating properties, so that the processing of the first insulating structure 23a can be simplified.

[0223] In the above technical solution, when the pole body 21 includes the peripheral portion 212 and the first adapter structure 22a clamps the peripheral portion 212 through the first insulating structure 23a, at least part of the sealing structure 231 can be clamped on the side of the peripheral portion 212 facing the electrode component 3. In this way, the sealing can be performed from the side of the peripheral portion 212 close to the accommodation cavity 13, and the leakage of the electrolyte from the mating position of the pole body 21 and the first adapter structure 22a can be more effectively inhibited, thereby improving the sealing effect.

[0224] It should be noted that the shape and processing method of the third adapter ring 223 are not limited, for example, the third adapter ring 223 can be processed by stamping, punching, stretching, bending and the like, for example, the third adapter ring 223 can be processed into, but is not limited to, the shape shown in FIG. 17 or FIG. 18.

[0225] In some embodiments of the present application, in combination with FIG. 19 and FIG. 20, the first adapter structure 22a includes a fourth adapter ring 227, the fourth adapter ring 227 includes a mating ring portion 2271, the pole body 21 passes through the mating ring portion 2271 and is clamped on both the inner and outer sides of the mating ring portion 2271 by the first insulating structure 23a; that is, the side of the mating ring portion 2271 facing the active material coating portion 32 and the side of the mating ring portion 2271 facing away from the active material coating portion 32 are both clamped by the first insulating structure 23a. The connection method of the fourth adapter ring 227 and the first shell wall 111 is not limited, for example, the fourth adapter ring 227 and the first shell wall 111 can be welded, riveted, punched, bonded and the like. In the above technical solution, the pole body 21 clamps the fourth adapter ring 227, so that the structure of the pole component 2 is simple and easy to process, and the relative fixation and insulating cooperation of the pole body 21 and the first adapter structure 22a can be simply and effectively achieved.

[0226] Exemplarily, the fourth adapter ring 227 and the first shell wall 111 are both made of aluminum and are welded, so as to facilitate improving the welding yield.

[0227] In some embodiments of the present application, referring to FIG. 19 and FIG. 20, the first accommodation groove 51 is formed on the side of the fourth adapter ring 227 and the pole body 21 facing the electrode component 3, and the fourth adapter ring 227 protrudes relative to the first shell wall 111 in a direction away from the electrode component 3, so that the first accommodation groove 51 is recessed relative to the first shell wall 111 in a direction away from the electrode component 3.

[0228] In combination with FIGS. 19 and 20, the fourth adapter ring 227 includes a third stepped portion 2273 protruding from the pole body 21 and protruding toward the direction away from the electrode component 3 relative to the first shell wall 111, the third stepped portion 2273 forms a raised portion of the fourth adapter ring 227, and the base groove 511 is formed on the side of the third stepped portion 2273 facing the electrode component 3 (i.e., the side facing the active material coating portion 32, or the inner side). The third stepped portion 2273 is arranged around the fitting ring portion 2271, and the third stepped portion 2273 can be flush with the fitting ring portion 2271 (for example, as shown in FIG. 19) or can not be flush with the fitting ring portion 2271 (for example, as shown in FIG. 20).

[0229] For example, when the first adapter structure 22a only includes the fourth adapter ring 227 (for example, the surface of the fourth adapter ring 227 can have an insulating layer, or can also have no insulating layer), the inner end surface of the fourth adapter ring 227 constitutes the inner end surface 220 of the first adapter structure 22a to participate in the formation of the first accommodating groove 51; and when the first adapter structure 22a further includes a third insulating support installed on the inner side of the fourth adapter ring 227 (i.e., the side close to the active material coating portion 32), the inner end surface of the third insulating support constitutes the inner end surface 220 of the first adapter structure 22a to participate in the formation of the first accommodating groove 51.

[0230] For example, in combination with FIGS. 19 and 20, the pole body 21 can include a penetrating portion 214 penetrating the fitting ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetrating portion 214 and clamped on the inner and outer sides of the fitting ring portion 2271; the inner limiting portion 215 is clamped on the inner side of the fitting ring portion 2271 (i.e., the side facing the active material coating portion 32), and the outer limiting portion 216 is clamped on the outer side of the fitting ring portion 2271 (i.e., the side away from the active material coating portion 32). The first insulating structure 23a includes a sealing structure 231, at least part of the sealing structure 231 is clamped between the fitting ring portion 2271 and the inner limiting portion 215.

[0231] Thus, the sealing structure 231 is clamped by the cooperation position of the pole body 21 and the cooperation ring part 2271, so that the sealing structure 231 can be at the cooperation position of the first adapter structure 22a and the pole body 21, which is conducive to sealing the cooperation position of the first adapter structure 22a and the pole body 21 in a shorter path, improves the reliability of the sealing, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, easily realizing compression sealing, and improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the cooperation ring part 2271 and the inner limiting part 215, the sealing can be performed from the side of the cooperation ring part 2271 close to the accommodation cavity 13, which can more effectively prevent the electrolyte from leaking from the cooperation position of the pole body 21 and the first adapter structure 22a, thereby improving the sealing effect.

[0232] It should be noted that when the pole body 21 includes the penetrating part 214 penetrating the cooperation ring part 2271, and the inner limiting part 215 and the outer limiting part 216 connected with the penetrating part 214 and clamped on the inner and outer sides of the cooperation ring part 2271, the first insulation structure 23a is not limited to be an integral piece or a split assembly.

[0233] Exemplarily, in combination with FIG. 19, the first insulation structure 23a includes an integral sealing structure 231, and the sealing structure 231 surrounds the cooperation ring part 2271 and is clamped between the cooperation ring part 2271 and the inner limiting part 215, and is clamped between the cooperation ring part 2271 and the outer limiting part 216. That is, the sealing structure 231 is an integral annular structure, that is, it has insulation and sealing properties. Thus, since the sealing structure 231 is an integral structure and surrounds the cooperation ring part 2271, the number of parts can be reduced and the assembly process can be reduced.

[0234] Exemplarily, in combination with Fig. 20, the first insulation structure 23a comprises a second insulation piece 234 and a sealing structure piece 231. The second insulation piece 234 is clamped between the outer limiting portion 216 and the cooperating ring portion 2271, and the sealing structure piece 231 is clamped between the inner limiting portion 215 and the cooperating ring portion 2271. Thus, since the first insulation structure 23a comprises the second insulation piece 234 and the sealing structure piece 231 which are not integrated as one piece, the design and processing of the first insulation structure 23a can be simplified. Moreover, according to the specific cooperation requirements of the pole body 21 and the first adapter structure 22a, the second insulation piece 234 can be set as an insulation piece (e.g. a plastic piece) which is substantially incompressible and does not have sealing effect, or the second insulation piece 234 can also be set as a sealing piece (e.g. an elastic rubber piece) which is compressible and has sealing effect, so as to meet different actual requirements. In addition, when the second insulation piece 234 is an insulation piece (e.g. a plastic piece) which is substantially incompressible and does not have sealing effect, the compression amount of the sealing structure piece 231 can be easily controlled, and the sealing effect is improved.

[0235] It is worth noting that when the pole body 21 comprises the penetrating portion 214 penetrating the cooperating ring portion 2271, and the inner limiting portion 215 and the outer limiting portion 216 connected with the penetrating portion 214 and clamped on both inner and outer sides of the cooperating ring portion 2271, the shape and processing method of the pole body 21 are not limited, for example. The pole body 21 can be processed by separate welding or riveting, for example, and can be processed into, but is not limited to, the shape shown in Fig. 19 or Fig. 20.

[0236] Exemplarily, in combination with Fig. 19, when assembled, the connection mode of the penetrating portion 214 and the inner limiting portion 215 is not limited, and the penetrating portion 214 and the inner limiting portion 215 can be one piece or separate pieces connected in advance. The end of the penetrating portion 214 away from the inner limiting portion 215 can have a riveting portion 2141. When the pole body 21 is assembled to the fourth adapter ring 227, the penetrating portion 214 can be penetrated along the direction from the inner limiting portion 215 to the outer limiting portion 216 to the cooperating ring portion 2271 which is cooperated with the first insulation structure 23a (such as the sealing structure piece 231 surrounding the cooperating ring portion 2271, or the second insulation piece 234 and the sealing structure piece 231), and then the riveting portion 2141 is riveted to limit the penetrating portion 214 from being pulled out along the direction from the outer limiting portion 216 to the inner limiting portion 215. Then, the riveting portion 2141 and the outer limiting portion 216 can be welded, so as to facilitate the connection, for example, welding, of the penetrating portion 214 and the outer limiting portion 216. Alternatively, the riveting portion 2141 and the riveting process after the penetrating portion 214 is penetrated can be omitted.

[0237] Exemplarily, in combination with FIG. 20, the penetrating portion 214, the inner limiting portion 215 and the outer limiting portion 216 are an integral piece, when assembling the pole body 21 to the fourth adapter ring 227, the penetrating portion 214 can be first penetrated along the direction from the inner limiting portion 215 to the outer limiting portion 216 to the fitting ring portion 2271 which is fitted with the sealing structure 231, then the second insulating member 234 is assembled (or the second insulating member 234 can be first assembled to the fitting ring portion 2271 and then the penetrating portion 214 is penetrated), and then the outer limiting portion 216 is riveted and pressed, so that the outer limiting portion 216 presses the second insulating member 234 to the fitting ring portion 2271, thereby easily controlling the compression amount of the sealing structure 231.

[0238] In some embodiments of the present application, please refer to FIG. 11, the inner end surface 211 of the pole body 21 and the inner end surface 220 of the first adapter structure 22a both participate in surrounding the first accommodating groove 51, the position of the inner end surface 220 of the first adapter structure 22a adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, that is, the circle of the inner end surface 220 of the first adapter structure 22a closest to the pole body 21 is the surrounding area 2201, and the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21. Wherein, the “inner end surface 211 of the pole body 21” refers to the side surface of the pole body 21 facing the electrode component 3 (i.e. facing the active material coated portion 32), and the “inner end surface 220 of the first adapter structure 22a” refers to the side surface of the first adapter structure 22a facing the electrode component 3 (i.e. facing the active material coated portion 32). Wherein, the inner end surface 220 of the first adapter structure 22a can be a planar structure or a non-planar structure.

[0239] At this time, when the inner end surface 211 of the pole body 21 is small (for example, the first adapter structure 22a is provided in a long strip shape (such as a rectangle, an ellipse, a racetrack shape, etc.) extending along the length direction of the first shell wall 111, and the pole body 21 is arranged at the center of the first adapter structure 22a and has a circular contour, for example, refer to FIG. 9), a part of the pole connecting portion (such as the folding portion 313 of the tab portion 33 described herein, or the second connecting segment 412 or the first conducting segment 415 of the conducting member 41) of the conducting portion 4 can be laid on the inner end surface 211 of the pole body 21, and the remaining part is laid on the surrounding area 2201 (for example, in the case that the pole connecting portion is also in a long strip shape), so that the pole connecting portion of the conducting portion 4 as a whole can be supported, facilitating the compression of the welding pressure, so that the conducting portion 4 can be reliably connected to the pole body 21. The “racetrack shape” is a long circle, which can be generally considered to be composed of a rectangle and two semicircles, and the contour shape of the long circle can be generally considered to be the contour shape of the rectangle after replacing the two short sides of the rectangle with two circular arcs.

[0240] Exemplarily, the conductive part 4 can include a pole connecting part, which can be a relatively hard sheet shape, such as the folding part 313 (e.g., an ultrasonic welding mark) of the tab part 33 or the second connecting segment 412 (e.g., a metal sheet) or the first conductive segment 415 (e.g., a metal sheet) of the conductive piece 41, which will not be deformed downward under the action of gravity.

[0241] In addition, when the surrounding area 2201 is spliced flush with the inner end surface 211 of the pole body 21, the inner end surface 211 of the pole body 21 can also be set to be larger (for example, the first adapter structure 22a is formed in a long strip shape extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the first adapter structure 22a, for example, refer to FIG. 6).

[0242] In addition, when the first adapter structure 22a is formed in a long strip shape (for example, a rectangular shape, an oval shape, a racetrack shape, etc.) extending along the length direction of the first shell wall 111, and the pole body 21 is arranged at the length center position of the adapter structure 22 and is circular. In this way, the connection position of the first adapter structure 22a and the pole body 21 is uniformly stressed, and the compression amount of the first insulating structure 23a is easy to control, so as to improve the reliability of the sealing cooperation between the two, and the sealing area is relatively small and not easy to fail.

[0243] Alternatively, in some embodiments of the present application, referring to FIG. 16, the inner end surface 211 of the pole body 21 and the inner end surface 220 of the first adapter structure 22a both participate in surrounding the first accommodating groove 51, and the position of the inner end surface 220 of the first adapter structure 22a adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, that is, the inner end surface 220 of the first adapter structure 22a closest to the pole body 21 is the surrounding area 2201, and the inner end surface 211 of the pole body 21 protrudes out of the surrounding area 2201 in the direction of the electrode part 3 (i.e., in the direction of the active material coating part 32). Wherein, the "inner end surface 211 of the pole body 21" refers to the side surface of the pole body 21 facing the electrode part 3 (i.e., facing the active material coating part 32), and the "inner end surface 220 of the first adapter structure 22a" refers to the side surface of the first adapter structure 22a facing the electrode part 3 (i.e., facing the active material coating part 32). Wherein, the inner end surface 220 of the first adapter structure 22a can be a planar structure or a non-planar structure.

[0244] Wherein, "the inner end surface 211 of the pole body 21 protrudes out of the surrounding area 2201 in the direction of the electrode part 3" refers to that the inner end surface 211 of the pole body 21 protrudes out of the surrounding area 2201 in the direction of the active material coating part 32. In short, the inner end surface 211 of the pole body 21 protrudes out of the surrounding area 2201 of the inner end surface 220 of the first adapter structure 22a in the inner direction.

[0245] Thus, by setting the inner end surface 211 of the pole body 21 to protrude from the surrounding area 2201 in the direction toward the electrode member 3, the pole body 21 can be inwardly retracted in the direction toward the accommodation cavity 13, while the height of the pole body 21 remains unchanged, so as to reduce the space occupied by the pole member 2 outside the shell member 1 and reduce the size of the battery monomer 102 in the direction in which the pole member 2 is arranged (for example, the first direction F1 shown in FIG. 3).

[0246] In some embodiments of the present application, when the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction toward the electrode member 3, as shown in FIG. 16, if the first adapter structure 22a is set to be long strip-shaped (for example, rectangular, oval, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111, the contour shape of the pole body 21 matches (for example, rectangular, oval, racetrack-shaped, etc.) the contour shape of the first adapter structure 22a. In this way, the inner end surface 211 of the pole body 21 is relatively large, which is conducive to laying the pole connecting part (for example, the folded part 313 of the tab 33 described herein, or the second connecting segment 412 or the first conducting segment 415 of the conducting member 41) of the conducting part 4 on the inner end surface 211 of the pole body 21 (for example, when the pole connecting part is also long strip-shaped), which is conducive to improving the connection area between the conducting part 4 and the pole body 21, thereby improving the charging performance.

[0247] For example, the conducting part 4 can include a pole connecting part, which can be a relatively hard plate shape that does not bend and deform downward under the action of gravity, such as the folded part 313 of the tab 33 described herein (such as an ultrasonic welding mark), or the second connecting segment 412 (such as a metal sheet) or the first conducting segment 415 (such as a metal sheet) of the conducting member 41.

[0248] In some embodiments of the present application, when the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction toward the electrode member 3, as shown in FIG. 8, if the first adapter structure 22a is set to be long strip-shaped extending along the length direction of the first shell wall 111, the pole body 21 is arranged in the center of the first adapter structure 22a and has a circular contour shape. In this way, the inner end surface 211 of the pole body 21 is relatively small. For example, as shown in FIG. 18, the conducting part 4 can be set to include a tab 33 and a conducting member 41 connected to the tab 33, the conducting member 41 including a first conducting segment 415 laid on the inner end surface 211 of the pole body 21, and a second conducting segment 416 offset from the inner end surface 211 of the pole body 21, the second conducting segment 416 protruding in the direction away from the electrode member 3 (i.e., in the direction toward the outside, or in the direction away from the active material coating part 32) relative to the first conducting segment 415, and the tab 33 is connected to the second conducting segment 416.

[0249] Thus, the second conductive section 416 of the conductive member 41 and the tab portion 33 can be accommodated by the height difference between the inner end surface 211 of the pole body 21 and the surrounding area 2201, so that the space can be fully utilized, the space occupancy of the conductive portion 4 to the accommodation cavity 13 can be reduced, and the energy density of the battery monomer 102 can be improved. For example, if the part (such as the folded portion 313 described herein) where the tab portion 33 is connected with the second conductive section 416 is long strip-shaped, the second conductive section 416 can also be provided as long strip-shaped, and the first conductive section 415 can be provided as circular-shaped to match the pole body 21, so that the connection requirements can be met.

[0250] When the conductive member 41 includes the first conductive section 415 and the second conductive section 416, in order to ensure that the second conductive section 416 protrudes in a direction away from the electrode component 3 relative to the first conductive section 415, the conductive member 41 can be made of a material with a certain hardness and thickness, for example, the conductive member 41 can be a metal sheet.

[0251] In addition, when the first adapter structure 22a is formed as a long strip-shaped (such as rectangular, oval, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111, the pole body 21 is arranged at the length center position of the adapter structure 22 and is circular-shaped. Thus, the connection position of the first adapter structure 22a and the pole body 21 is uniformly stressed, the compression amount of the first insulating structure 23a can be easily controlled, the reliability of the sealing fit between the two can be improved, and the sealing area is relatively small and not easy to fail.

[0252] In addition, according to the shape of the accommodation groove 5, the second conductive section 416 can be accommodated in the accommodation groove 5, or the second conductive section 416 can be arranged outside the accommodation groove 5.

[0253] In some embodiments of the present application, the outer contour of the orthographic projection of the first accommodation groove 51 on the first shell wall 111 (equivalent to the orthographic projection of the first accommodation groove 51 on the projection plane perpendicular to the wall thickness direction of the first shell wall 111) is located within the outer contour range of the orthographic projection of the pole body 21 on the first shell wall 111 (equivalent to the orthographic projection of the pole body 21 on the projection plane perpendicular to the wall thickness direction of the first shell wall 111).

[0254] In the above technical solution, it is beneficial to meet the requirement that the range of the first accommodation groove 51 is relatively small relative to the pole body 21.

[0255] With reference to FIG. 21 and FIG. 22, FIG. 21 is a partial cross-sectional view of a battery cell according to some embodiments of the present application; FIG. 22 is a partial cross-sectional view of a battery cell according to some embodiments of the present application; in some embodiments of the present application, the first adapter structure 22a includes a surrounding portion 22a1 located on the side of the pole body 21 close to the electrode component 3, the surrounding portion 22a1 surrounds an avoiding hole 22a2, the pole body 21 covers the side of the avoiding hole 22a2 away from the electrode component 3, the first accommodating groove 51 includes a first recess 512 surrounded by the surrounding portion 22a1 and the pole body 21 and recessed towards the direction away from the electrode component 3, and the conductive portion 4 is connected to the pole body 21 through the first recess 512. That is, at least part of the avoiding hole 22a2 constitutes the first recess 512, and the outer contour of the orthographic projection of the first recess 512 on the first shell wall 111 (equivalent to the orthographic projection of the first recess 512 on the projection plane perpendicular to the wall thickness direction of the first shell wall 111) is located within the outer contour of the orthographic projection of the pole body 21 on the first shell wall 111 (equivalent to the orthographic projection of the pole body 21 on the projection plane perpendicular to the wall thickness direction of the first shell wall 111).

[0256] In some embodiments of the present application, the inner end surface 211 of the pole body 21 is arranged further away from the electrode component 3 relative to the surrounding portion 22a1, so that the first accommodating groove 51 includes the first recess 512 formed between the pole body 21 and the surrounding portion 22a1 of the first adapter structure 22a. In this way, by arranging a drop between the pole body 21 and the surrounding portion 22a1, the first recess 512 can be naturally formed by the relative position of the pole body 21 and the first adapter structure 22a, and the first recess 512 can be easily obtained.

[0257] For example, with reference to FIG. 21 and FIG. 22, when the first adapter structure 22a includes a surrounding portion 22a1 located on the side of the pole body 21 towards the electrode component 3, and the surrounding portion 22a1 and the pole body 21 surround the first recess 512 recessed towards the direction away from the electrode component 3, the first adapter structure 22a can also include a first adapter ring 221 and a second adapter ring 222, the second adapter ring 222 is arranged on the side of the first adapter ring 221 away from the electrode component 3, the outer ring of the first adapter ring 221 is connected to the first shell wall 111, and the inner ring of the first adapter ring 221 and the inner ring of the second adapter ring 222 respectively hold the pole body 21 through the first insulating structure 23a. However, in the present example, the first adapter ring 221 can include a first step portion 2211 (for example, as shown in FIG. 22) surrounding the pole body 21 and protruding towards the direction away from the electrode component 3 relative to the first shell wall 111, and the second adapter ring 222 is connected to the first step portion 2211; or, the first adapter ring 221 can also be a planar structure (for example, as shown in FIG. 21) without the first step portion 2211 surrounding the pole body 21 and protruding towards the direction away from the electrode component 3 relative to the first shell wall 111.

[0258] Alternatively, exemplarily, when the first adapter structure 22a comprises a surrounding portion 22a1 located at the side of the pole body 21 facing the electrode component 3, and the surrounding portion 22a1 and the pole body 21 enclose a first recess 512 recessed toward the direction away from the electrode component 3, the first adapter structure 22a can further comprise a third adapter ring 223, and the first extension 2231 and the second extension 2232 of the third adapter ring 223 are respectively clamped by the first insulating structure 23a. However, in the present example, the third adapter ring 223 can comprise a second step portion 2232 surrounding the pole body 21 and protruding toward the direction away from the electrode component 3 relative to the first shell wall 111, or the third adapter ring 223 can be a planar structure (for example, as shown in FIG. 21) without the second step portion 2232 surrounding the pole body 21 and protruding toward the direction away from the electrode component 3 relative to the first shell wall 111.

[0259] In some embodiments of the present application, referring to FIG. 22, the first adapter structure 22a protrudes toward the direction away from the electrode component 3 relative to the first shell wall 111 to define a base groove 511 recessed toward the direction away from the electrode component 3 relative to the first shell wall 111, and the base groove 511 is open toward the direction of the electrode component 3 and communicates with the side of the first recess 512 facing the electrode component 3, and the conductive part 4 extends into the first recess 512 through the base groove 511 and is connected with the pole body 21.

[0260] The first adapter structure 22a is configured to protrude toward the direction away from the electrode component 3 relative to the first shell wall 111 to enclose the base groove 511 recessed toward the direction away from the electrode component 3, and since the first adapter structure 22a needs to surround the pole body 21, the first adapter structure 22a has a central ring hole (for example, the aforementioned avoiding hole 22a2 can be part of the central ring hole), and the part of the base groove 511 opposite to the central ring hole can be occupied by the pole body 21 or not.

[0261] Therefore, the first accommodating groove 51 comprises the base groove 511 and the first recess 512, and the conductive part 4 is connected with the pole body 21 through the base groove 511 and the first recess 512, so that the volume of the first accommodating groove 51 can be increased, and the space occupation of the conductive part 4 in the accommodating cavity 13 is further reduced.

[0262] In combination with FIG. 23 and FIG. 24, FIG. 23 is a partial cross-sectional view of a battery cell according to some embodiments of the application; FIG. 24 is a partial cross-sectional view of a battery cell according to some embodiments of the application; in some embodiments of the application, the pole post component 2 comprises a pole post body 21, the conductive part 4 is connected to the pole post body 21, the pole post body 21 comprises a first pole post piece 21a and a second pole post piece 21b, the second pole post piece 21b is connected to the first adapter structure 22a and defines a fitting hole 21b1, the first pole post piece 21a is assembled on the second pole post piece 21b and is located on the side of the second pole post piece 21b away from the electrode component 3 and covers the fitting hole 21b1, the first accommodating groove 51 comprises a second recess 513 jointly formed by the first pole post piece 21a and the second pole post piece 21b, the outer contour of the orthographic projection of the second recess 513 on the first shell wall 111 (equivalent to the orthographic projection of the second recess 513 on the projection plane perpendicular to the wall thickness direction of the first shell wall 111) is located within the outer contour of the orthographic projection of the pole post body 21 on the first shell wall 111 (equivalent to the orthographic projection of the pole post body 21 on the projection plane perpendicular to the wall thickness direction of the first shell wall 111). In this way, the pole post body 21 is assembled by two parts to define the second recess 513 by itself, thereby facilitating the obtaining of the second recess 513.

[0263] In addition, in the present embodiment, the configuration of the first adapter structure 22a is not limited, for example, it can be in the form of the fourth adapter ring 227 described above (for example, refer to FIG. 24), the second pole post piece 21b is inserted into the fitting ring part 2271 of the fourth adapter ring 227 and is clamped on the inner and outer sides of the fitting ring part 2271 by the first insulating structure 23a (the fourth adapter ring 227 can comprise a third step part 2273 surrounding the pole post body 21 and protruding away from the electrode component 3 relative to the first shell wall 111, or can also be a planar structure); or it can also be in the form of a combination of the first adapter ring 221 and the second adapter ring 222 described above (the first adapter ring 221 can comprise a first step part 2211 surrounding the pole post body 21 and protruding away from the electrode component 3 relative to the first shell wall 111, or can also be a planar structure); or it can also be in the form of the third adapter ring 223 described above (the third adapter ring 223 can comprise a second step part 2232 surrounding the pole post body 21 and protruding away from the electrode component 3 relative to the first shell wall 111, or can also be a planar structure).

[0264] In some embodiments of the present application, referring to FIG. 24, the first adapter structure 22a is raised relative to the first shell wall 111 in a direction away from the electrode component 3 to define a base groove 511 recessed relative to the first shell wall 111 in a direction away from the electrode component 3, the base groove 511 being open in a direction toward the electrode component 3 and communicating with a side of the second groove 513 facing the electrode component 3, and the conductive part 4 extends into the second groove 513 through the base groove 511 and is connected with the pole body 21.

[0265] The first adapter structure 22a is configured in a shape raised relative to the first shell wall 111 in a direction away from the electrode component 3 to enclose the base groove 511 recessed relative to the first shell wall 111 in a direction away from the electrode component 3 by the first adapter structure 22a, wherein, since the first adapter structure 22a needs to surround the pole body 21, the first adapter structure 22a has a central ring hole, and the part of the base groove 511 opposite to the central ring hole can be occupied by the pole body 21 or not.

[0266] Thus, the first accommodating groove 51 includes the base groove 511 and the second groove 513, and the conductive part 4 is connected with the pole body 21 through the base groove 511 and the second groove 513, so that the volume of the first accommodating groove 51 can be increased, and the space occupation of the conductive part 4 to the accommodating cavity 13 is further reduced.

[0267] In any of the above embodiments, the first insulating structure 23a can include a sealing structure 231, the sealing structure 231 is annularly arranged on the side of the first adapter structure 22a facing the pole body 21, and at least part of the sealing structure 231 is clamped between the first adapter structure 22a and the pole body 21 in the inner-outer direction of the first shell wall 111. In this embodiment, the sealing structure 231 is made of a material that has both sealing and insulating properties, for example, it can be an elastic rubber part.

[0268] The direction from the inner side of the first shell wall 111 to the outer side of the first shell wall 111, and the direction from the outer side of the first shell wall 111 to the inner side of the first shell wall 111, are collectively referred to as the "inner-outer direction of the first shell wall 111" (for example, the fifth direction F5 shown in FIG. 11). 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.

[0269] Thus, by arranging at least part of the sealing structure 231 to be clamped between the first adapter structure 22a and the pole body 21 in the inner-outer direction of the first shell wall 111 (for example, the fifth direction F5 shown in FIG. 11), axial sealing between the first adapter structure 22a and the pole body 21 is achieved, and the axial sealing can achieve a more reliable sealing effect, improving the problem of leakage at the fitting position of the first adapter structure 22a and the pole body 21.

[0270] In addition, if the pole part only includes the pole body, and an axial sealing member is arranged between the pole body and the first shell wall, a sealing pressure needs to be applied in the axial direction of the mounting hole, which can cause excessive stress on the first shell wall. However, by integrating the axial sealing (such as the sealing structure 231) into the pole part 2, the axial force on the first shell wall 111 can be reduced. Moreover, by arranging the sealing structure 231 around the inner ring of the first adapter structure 22a, the sealing structure 231 can approach the fitting position of the first adapter structure 22a and the pole body 21, which is conducive to sealing the fitting position of the first adapter structure 22a and the pole body 21 in a shorter path, improving the reliability of the sealing, and is conducive to reducing the size of the sealing structure 231 and the sealing area, facilitating compression sealing, reducing the risk of sealing failure, and improving the sealing effect.

[0271] For example, referring to FIG. 6, the ratio of the width W2 of the pole part 2 to the length L2 of the pole part 2 satisfies 10% to 60%, which is applicable to both the positive pole part 2 and the negative pole part 2. Further, the ratio of the width W2 of the pole part 2 to the length L2 of the pole part 2 can also satisfy 25% to 40%, for example, the width W2 of the pole part 2 is about 21 mm, for example, the length L2 of the pole part 2 is about 63 mm, and the ratio of the width W2 of the pole part 2 to the length L2 of the pole part 2 is about 33%.

[0272] Thus, by setting the ratio of the width W2 of the pole part 2 to the length L2 of the pole part 2 to satisfy 10% to 60%, the overall area of the pole part 2 can be relatively large, which is conducive to meeting the relatively large requirement for the electrical connection area between the pole part 2 and the electrode part 3. At the same time, the width of the pole part 2 is relatively small compared to the length, so that when connecting the pole part 2 and the electrode part 3, the pole part 2 can be placed with one side edge in the width direction facing the active material coating part 32. Since the width of the pole part 2 is small, the distance between the pole part 2 and the active material coating part 32 can be shortened, thereby shortening the length of the conductive part 4 and reducing the redundancy of the conductive part 4.

[0273] Exemplarily, referring to FIG. 6, the ratio of the width W2 of the pole piece 2 to the width W1 of the first shell wall 111 can be 20% to 90%, which is applicable to both the pole piece 2 of the positive electrode and the pole piece 2 of the negative electrode. Further, the ratio of the width W2 of the pole piece 2 to the width W1 of the first shell wall 111 can be 70% to 80%, for example, the width W2 of the pole piece 2 is about 21 mm, the width W1 of the first shell wall 111 is about 28 mm, and the ratio of the width W2 of the pole piece 2 to the width W1 of the first shell wall 111 is about 75%. In this way, the pole piece 2 can make full use of the space in the width direction of the first shell wall 111. Exemplarily, the width W1 of the first shell wall 111 is consistent with the size of the battery monomer 102 in the width direction of the first shell wall 111, for example, the width of the first shell wall 111 shown in FIG. 3 is consistent with the size of the battery monomer 102 in the second direction F2.

[0274] Exemplarily, referring to FIG. 6, when two pole pieces 2 are arranged on the first shell wall 111 and spaced apart along the length direction of the first shell wall 111, the ratio of the length L2 of the pole piece 2 to the length L1 of the first shell wall 111 can be 25% ± 15% (i.e. 10% to 40%), which is applicable to both the pole piece 2 of the positive electrode and the pole piece 2 of the negative electrode. Further, the ratio of the length L2 of the pole piece 2 to the length L1 of the first shell wall 111 can be 15% to 30%, for example, the length L2 of the pole piece 2 is about 63 mm, the length L1 of the first shell wall 111 is about 297 mm, and the ratio of the length L2 of the pole piece 2 to the length L1 of the first shell wall 111 is about 21%. In this way, the pole piece 2 can make full use of the space in the length direction of the first shell wall 111. In this way, the pole piece 2 can make full use of the space in the length direction of the first shell wall 111. Exemplarily, the length L1 of the first shell wall 111 is consistent with the size of the battery monomer 102 in the length direction of the first shell wall 111, for example, the length of the first shell wall 111 shown in FIG. 3 is consistent with the size of the battery monomer 102 in the third direction F3.

[0275] Exemplarily, referring to FIG. 31, which is an exploded view of part of the battery monomer provided by some embodiments of the present application, the shape of the mounting hole 112 matches the contour shape of the pole piece 2, for example, when the pole piece 2 includes the first adapter structure 22a, the contour shape of the first adapter structure 22a (i.e. the outer shape of the first adapter structure 22a) matches the shape of the mounting hole 112, thereby facilitating the connection of the pole piece 2 and the first shell wall 111, and facilitating the pole piece 2 to expose more area in the direction of the accommodation cavity 13, which is conducive to accommodating the conductive part 4 and / or connecting with the conductive part 4.

[0276] Exemplarily, the shape of the mounting hole 112 matches the profile shape of the pole part 2, and in a normal projection of the mounting hole 112 on a projection plane perpendicular to the thickness direction of the first shell wall 111, the normal projection of the mounting hole 112 on the projection plane completely falls within the normal projection range of the pole part 2 on the projection plane, so that the first shell wall 111 and the pole part 2 have a certain overlapping area, which is beneficial to the simple and reliable connection of the two.

[0277] Exemplarily, the mounting hole 112 is a long strip-shaped hole (for example, rectangular, oval or track-shaped, etc.), and the pole part 2 is formed as a long strip-shaped structure (for example, rectangular, oval or track-shaped, etc.) matching the shape of the mounting hole 112. When the connection of the electrode part 3 and the pole part 2 is performed first, then the pole part 2 is extended from the mounting hole 112 to the outside of the first shell wall 111, and then the pole part 2 is flipped from the outside of the first shell wall 111 to cover the mounting hole 112, and then the connection of the pole part 2 and the first shell wall 111 is performed, if the pole part 2 is set as a long strip-shaped structure matching the shape of the mounting hole 112, the pole part 2 can be adjusted to an angle close to the width direction of the mounting hole 112 in the thickness direction of the pole part 2 to pass through the mounting hole 112, and after the pole part 2 passes through the mounting hole 112, the thickness direction of the pole part 2 is rotated to be close to the thickness direction of the first shell wall 111, so that the space required for the flipping movement of the pole part 2 is small, which can reduce the space required for the flipping of the pole part 2, thereby being beneficial to shortening the length of the conductive part 4, saving materials and reducing costs, and reducing the redundancy of the conductive part 4, reducing the space occupation of the conductive part 4 to the accommodation cavity 13, and being beneficial to improving the energy density of the battery monomer 102.

[0278] Please refer to FIG. 25, which is a partial sectional view of a battery monomer provided in some embodiments of the present application; in some embodiments of the present application, the pole part 2 is covered on the side of the first shell wall 111 away from the electrode part 3, the pole part 2 includes a pole body 21, a second adapter structure 22b and a second insulation structure 23b, the second adapter structure 22b surrounds the pole body 21 and is connected with the first shell wall 111. The second insulation structure 23b is in insulating fit between the second adapter structure 22b and the pole body 21, and the conductive part 4 is connected with the pole body 21. For example, the outer ring of the second adapter structure 22b and the first shell wall 111 can be connected by welding, riveting, punching or bonding.

[0279] Exemplarily, referring to FIG. 25, the first shell wall 111 is provided with a mounting hole 112, and a sealing ring 14 is arranged around the mounting hole 112. The sealing ring 14 is clamped between the pole piece 2 and the first shell wall 111. The pole piece 2 and the sealing ring 14 form a second accommodating groove 52 which is recessed towards the direction away from the electrode piece 3. The accommodating groove 5 includes the second accommodating groove 52. In this way, the pole piece 2 has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall 111, and the second accommodating groove 52 is defined.

[0280] Referring to FIG. 26, FIG. 26 is a partial sectional view of a battery cell provided in some embodiments of the present application. In some embodiments of the present application, the pole body 21 includes a first pole piece 21a and a second pole piece 21b. The second pole piece 21b is connected with the first shell wall 111, and the second pole piece 21b defines a fitting hole 21b1. The first pole piece 21a is assembled on the side of the second pole piece 21b away from the electrode piece 3. The accommodating groove 5 includes a third accommodating groove 53 which is jointly formed by the first pole piece 21a and the second pole piece 21b. For example, the second pole piece 21b can be connected with the first shell wall 111 by welding, riveting, punching, or bonding. In this way, the pole body 21 is provided in two parts to define the third accommodating groove 53 by itself, thereby facilitating the obtaining of the third accommodating groove 53.

[0281] Exemplarily, referring to FIG. 26, the second pole piece 21b defines the fitting hole 21b1. The first pole piece 21a is assembled on the side of the second pole piece 21b away from the electrode piece 3 and covers the fitting hole 21b1. The side surface of the first pole piece 21a towards the electrode piece 3 is a plane. The space in the fitting hole 21b1 on the side of the first pole piece 21a towards the electrode piece 3 is the third accommodating groove 53. Alternatively, exemplarily, the first pole piece 21a itself defines a recessed groove towards the direction away from the electrode piece 3. The recessed groove and the fitting hole 21b1 jointly form the third accommodating groove 53.

[0282] For any of the cases that the accommodating groove 5 includes at least the above-mentioned first recessed groove 512, or at least the above-mentioned second recessed groove 513, or at least the above-mentioned second accommodating groove 52, or at least the above-mentioned third accommodating groove 53, in some embodiments, referring again to FIG. 21, the inner end surface 211 of the pole body 21 includes a fitting area 211a which participates in defining the groove wall of the accommodating groove 5. The conductive part 4 is connected with the fitting area 211a through the accommodating groove 5. In combination with FIG. 6, the fitting area 211a is formed as an elongated area (for example, a rectangle, an ellipse, a racetrack, etc.) extending along the length direction of the first shell wall 111.

[0283] In this way, the fitting area 211a of the inner end surface 211 of the pole body 21 is relatively large, which is conducive to laying the pole connecting part (for example, the folded part 313 of the tab 33 described herein, or the second connecting segment 412 or the first conductive segment 415 of the conductive member 41) of the conductive part 4 on the fitting area 211a of the inner end surface 211 of the pole body 21 (for example, when the pole connecting part is also long strip-shaped), which is conducive to improving the connection area between the conductive part 4 and the pole body 21, thereby improving the charging performance.

[0284] Illustratively, the conductive part 4 can include a pole connecting part, which can be a relatively hard plate shape, such as not being bent and deformed downward under the action of gravity, for example, the folded part 313 (such as an ultrasonic welding mark) of the tab 33 described herein, or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0285] Illustratively, in combination with FIG. 21, when the accommodation groove 5 at least includes the first groove 512 described above, the side groove wall of the first groove 512 away from the electrode component 3 is the fitting area 211a. The first groove 512 can be set as a long strip-shaped groove, and the fitting area 211a is a long strip-shaped area. The pole connecting part (for example, the folded part 313 of the tab 33 described herein, or the second connecting segment 412 or the first conductive segment 415 of the conductive member 41) can be extended into the first groove 512 and laid on the fitting area 211a connected with the fitting area 211a.

[0286] Illustratively, in combination with FIG. 23, when the accommodation groove 5 at least includes the second groove 513 described above, the side groove wall of the second groove 513 away from the electrode component 3 is the fitting area 211a. The second groove 513 can be set as a long strip-shaped groove, and the fitting area 211a is a long strip-shaped area. The pole connecting part can be extended into the second groove 513 and laid on the fitting area 211a connected with the fitting area 211a.

[0287] Illustratively, in combination with FIG. 25, when the accommodation groove 5 at least includes the second accommodation groove 52 described above, the side groove wall of the second accommodation groove 52 away from the electrode component 3 is the fitting area 211a. The second accommodation groove 52 can be set as a long strip-shaped groove, and the fitting area 211a is a long strip-shaped area. The pole connecting part can be extended into the second accommodation groove 52 and laid on the fitting area 211a connected with the fitting area 211a.

[0288] Exemplarily, in combination with FIG. 26, when the accommodation groove 5 at least comprises the third accommodation groove 53 described above, the side groove wall of the third accommodation groove 53 away from the electrode component 3 is the matching area 211a, the third accommodation groove 53 can be arranged as an elongated groove, the matching area 211a is an elongated area, and the pole post connecting part can be extended into the third accommodation groove 53 and laid on the matching area 211a connected with the matching area 211a.

[0289] For any one of the cases that the accommodation groove 5 at least comprises the first groove 512 described above, at least comprises the second groove 513 described above, at least comprises the second accommodation groove 52 described above, or at least comprises the third accommodation groove 53 described above, in some embodiments, referring to FIG. 22 again, the inner end face 211 of the pole post body 21 comprises the matching area 211a which participates in defining the groove wall of the accommodation groove 5, the conductive part 4 comprises the lug part 33 and the conductive piece 41 connected with the lug part 33, and the conductive piece 41 is connected with the matching area 211a through the accommodation groove 5.

[0290] Therefore, by arranging the adapter piece 41, the form and material of the conductive piece 41 can be flexibly adjusted to adapt to the connection requirements of different positions. For example, when the matching area 211a of the inner end face 211 of the pole post body 21 is relatively small (for example, the matching area 211a is only a circular area), the pole post connecting part of the adapter piece 41 can also be arranged to be relatively small, so that the pole post connecting part can be extended into the accommodation groove 5 and laid on the matching area 211a connected with the matching area 211a.

[0291] Exemplarily, if the part (such as the folded part 313 described herein) of the lug part 33 connected with the adapter piece 41 is elongated, the pole post connecting part of the adapter piece 41 can be arranged to be in the shape (for example, circular) matched with the matching area 211a, which can meet the connection requirements.

[0292] Exemplarily, the conductive part 4 can comprise the pole post connecting part, which can be a relatively hard plate shape, such as the folded part 313 (such as the ultrasonic welding mark) of the lug part 33 described herein or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive piece 41, which will not be deformed downward under the action of gravity.

[0293] Exemplarily, in combination with FIG. 22, when the accommodation groove 5 at least comprises the first groove 512 described above, the side groove wall of the first groove 512 away from the electrode component 3 is the matching area 211a, and the conductive piece 41 is connected with the matching area 211a through the first groove 512. For example, when the first groove 512 is a circular groove, the matching area 211a is a circular area, and the pole post connecting part of the adapter piece 41 can also be arranged to be relatively small, so that the pole post connecting part can be extended into the first groove 512 and laid on the matching area 211a connected with the matching area 211a.

[0294] For example, in combination with FIG. 24, when the accommodation groove 5 includes at least the second recess 513, the side groove wall of the second recess 513 facing away from the electrode component 3 is the matching area 211a, and the conductive piece 41 is connected with the matching area 211a through the second recess 513. For example, when the second recess 513 is a circular groove, the matching area 211a is a circular area, and the pole connecting part of the adapter 41 can be relatively small, so that the pole connecting part can extend into the second recess 513 and be laid on the matching area 211a.

[0295] For example, in combination with FIG. 24, when the accommodation groove 5 includes at least the second recess 513, the side groove wall of the second recess 513 facing away from the electrode component 3 is the matching area 211a, and the conductive piece 41 is connected with the matching area 211a through the second recess 513. For example, when the second recess 513 is a circular groove, the matching area 211a is a circular area, and the pole connecting part of the adapter 41 can be relatively small, so that the pole connecting part can extend into the second recess 513 and be laid on the matching area 211a.

[0296] For example, in combination with FIG. 24, when the accommodation groove 5 includes at least the second recess 513, the side groove wall of the second recess 513 facing away from the electrode component 3 is the matching area 211a, and the conductive piece 41 is connected with the matching area 211a through the second recess 513. For example, when the second recess 513 is a circular groove, the matching area 211a is a circular area, and the pole connecting part of the adapter 41 can be relatively small, so that the pole connecting part can extend into the second recess 513 and be laid on the matching area 211a.

[0297] In addition, when the adapter 41 is used, the matching area 211a can also be relatively large, for example, it can be a relatively large area shape such as a long strip-shaped area extending along the length direction of the first shell wall 111, etc.

[0298] For any of the cases that the accommodation groove 5 includes at least the first recess 512, or at least the second recess 513, or at least the second accommodation groove 52, or at least the third accommodation groove 53, in some embodiments, referring again to FIG. 22, the conductive piece 41 can include a first conductive section 415 laid on the matching area 211a, and the conductive piece 41 includes a third conductive section 417 offset from the matching area 211a, the third conductive section 417 protrudes towards the direction of the electrode component 3 relative to the first conductive section 415, and the pole lug part 33 is connected with the third conductive section 417.

[0299] Therefore, the adapter 41 can meet the connection requirement with the matching area 211a and easily meet the connection requirement with the tab portion 33. In addition, when the conductive piece 41 comprises the first conductive segment 415 and the third conductive segment 417, in order to ensure that the third conductive segment 417 protrudes towards the electrode component 3 relative to the first conductive segment 415, the conductive piece 41 can be processed by using a material with certain hardness and thickness, for example, the conductive piece 41 can be a metal sheet.

[0300] Exemplarily, if the part of the tab portion 33 connected with the third conductive segment 417 (for example, the folded portion 313 described herein) is a long strip shape, the third conductive segment 417 can also be set as a long strip shape, and the first conductive segment 415 can be set as a shape matched with the shape of the matching area 211a (for example, a circular shape), which can meet the connection requirement.

[0301] In addition, according to different shapes of the accommodation groove 5, the third conductive segment 417 can be accommodated in the accommodation groove 5, or the third conductive segment 417 can be arranged outside the accommodation groove 5.

[0302] Please refer to FIG. 27, which is a partial sectional view of a battery cell provided in some embodiments of the present application; in some embodiments of the present application, the first shell wall 111 comprises a raised structure 1114 raised towards a direction away from the electrode component 3 (i.e. a direction away from the active material coated portion 32), and the mounting hole 112 is through the raised structure 1114, the pole component 2 is arranged at the mounting hole 112 and surrounds the raised structure 1114 to form a fourth accommodation groove 54 recessed towards a direction away from the electrode component 3 (i.e. a direction away from the active material coated portion 32), and the accommodation groove 5 comprises the fourth accommodation groove 54. Therefore, by designing the stepped shape of the first shell wall 111 to form the fourth accommodation groove 54, the design of the pole component 2 can be more diverse. In addition, in the present embodiment, the type of the pole component 2 is not limited, which can be any of the pole components in the above-mentioned embodiments, and different connection modes can be selected according to the type of the pole component 2, for example, cover welding, or riveting, etc., which are not described herein. Exemplarily, referring to FIG. 27, the pole component 2 can comprise a pole body 21 and a third insulating structure 23c, and the third insulating structure 23c is insulatively matched between the pole body 21 and the raised structure 1114.

[0303] In the embodiments of the present application, the accommodation groove 5 can also be a combination of any one of the above-mentioned first accommodation groove 51, the second accommodation groove 52, the third accommodation groove 53 and the fourth accommodation groove 54, thereby facilitating to increase the volume of the accommodation groove 5, and the diversity of the accommodation groove 5 can be realized.

[0304] Further, the first adapter structure 22a (e.g. the first adapter ring 221, the third adapter ring 223 or the fourth adapter ring 227) or the first shell wall 111 can be configured to have a shape of bulging towards a direction away from the electrode component 3 relative to the first shell wall 111 by a stamping process.

[0305] Referring to Fig. 7 again, in some embodiments of the present application, at least part of the tab portion 33 is accommodated in the accommodation groove 5 and extends to and connects with the pole component 2, for example, welded together, or bonded together by conductive glue, or connected by punching, etc. At this time, the conductive portion 4 can only include the tab portion 33, and the conductive piece 41 extending from the tab portion 33 to the pole body 21 can be omitted, saving the material cost of the conductive piece 41 and the connection step of the conductive piece 41 and the tab portion 33.

[0306] In some embodiments of the present application, referring to Fig. 7, the tab portion 33 includes a gathered portion 313 formed by laminating and connecting multiple tab sheets 311.

[0307] Exemplarily, the tab portion 33 of the electrode component 3 includes a laminated portion 312 formed by laminating and gathering multiple tab sheets 311, and the multiple tab sheets 311 in the laminated portion 312 are connected to form the gathered portion 313. Among them, the electrode component 3 includes one or more electrode assemblies 31, and the electrode assembly 31 has positive tab sheets 311 and negative tab sheets 311. Multiple tab sheets 311 of the same polarity are laminated and gathered to form the laminated portion 312, thereby facilitating the pretreatment of the tab portion 33 or the connection operation with other components.

[0308] Exemplarily, the multiple tab sheets 311 in the laminated portion 312 can belong to the same electrode assembly 31, or can belong to different electrode assemblies 31, that is, the same electrode assembly 31 can gather several layers of tab sheets 311 of the same polarity to form the laminated portion 312, or different electrode assemblies 31 can gather several layers of tab sheets 311 of the same polarity to form the laminated portion 312. Exemplarily, all tab sheets 311 of the same polarity in the electrode component 3 can be gathered to form the laminated portion 312, which can reduce the number of laminated portions 312.

[0309] In the technical solution, the plurality of layers of the tab pieces 311 in the folding part 313 are connected to form the folding part 313, so that the plurality of layers of the tab pieces 311 in the folding part 313 are electrically connected, that is, the plurality of layers of the tab pieces 311 in the folding part 313 not only have a stacked relationship, but also have a connected and conductive relationship. The connection mode of the plurality of layers of the tab pieces 311 in the folding part 313 is not limited, for example, it can be welding (such as ultrasonic welding, ultrasonic pre-welding, and laser welding, resistance welding, pressure fusion welding, or brazing), or perforation connection, or adhesion by conductive glue. Exemplarily, the plurality of layers of the tab pieces 311 with the same polarity can be ultrasonic welded, and the ultrasonic welding mark formed is the folding part 313.

[0310] Exemplarily, the plurality of layers of the tab pieces 311 in the folding part 313 can belong to the same electrode assembly 31, or can belong to different electrode assemblies 31, that is, the plurality of layers of the tab pieces 311 with the same polarity in the same electrode assembly 31 can be connected to form the folding part 313, or the plurality of layers of the tab pieces 311 with the same polarity in different electrode assemblies 31 can be connected to form the folding part 313. Exemplarily, all the tab pieces 311 with the same polarity in the electrode component 3 can be connected to form the folding part 313, which can reduce the number of the folding parts 313.

[0311] In the technical solution, the plurality of layers of the tab pieces 311 in the folding part 313 are connected to form the folding part 313, so that the plurality of layers of the tab pieces 311 in the folding part 313 are electrically connected, that is, the plurality of layers of the tab pieces 311 in the folding part 313 not only have a stacked relationship, but also have a connected and conductive relationship. The connection mode of the plurality of layers of the tab pieces 311 in the folding part 313 is not limited, for example, it can be welding (such as ultrasonic welding, ultrasonic pre-welding, and laser welding, resistance welding, pressure fusion welding, or brazing), or perforation connection, or adhesion by conductive glue. Exemplarily, the plurality of layers of the tab pieces 311 with the same polarity can be ultrasonic welded, and the ultrasonic welding mark formed is the folding part 313.

[0312] Exemplarily, during processing, a plurality of electrode assemblies 31 can be stacked first, and the plurality of layers of the tab pieces 311 with the same polarity in the plurality of electrode assemblies 31 are ultrasonic welded to form the folding part 313, so as to improve the tensile stress between the tab pieces 311 caused by the asynchronization of the electrode assemblies 31, and to avoid the cracking problem of the folding part 313 in the form of an ultrasonic welding mark.

[0313] In some embodiments of the present application, referring to FIG. 5, the electrode component 3 comprises a plurality of electrode assemblies 31 arranged in a stack, and the tabs 311 of the plurality of electrode assemblies 31 are gathered towards the direction of the accommodation groove 5. For example, when the battery cell 102 is processed, the plurality of electrode assemblies 31 can be stacked along the thickness direction (e.g., the fourth direction F4 shown in the figure) of the electrode assembly 31, and the plurality of electrode assemblies 31 in the stack can be bound by a binding member (e.g., blue glue), and a lamination portion 312 can be formed at the gathering position. In this case, since the side of the accommodation groove 5 facing the electrode component 31 forms a space for accommodation, the tabs 311 are gathered towards the space, which is conducive to making full use of the space, facilitating the accommodation groove 5 to accommodate the conductive part 4 to a greater extent, facilitating the further reduction of the space occupation of the conductive part 4 in the accommodation cavity 13, and facilitating the improvement of the energy density of the battery cell 102.

[0314] However, the present application is not limited thereto. For example, when the tab portion 33 is connected to the second conductive section 416 of the conductive member 41, the tabs 311 of the plurality of electrode assemblies 31 can be gathered towards the direction of the second conductive section 416. In this case, the second conductive section 416 can be located in the accommodation groove 5 or outside the accommodation groove 5. When the second conductive section 416 is located in the accommodation groove 5, the tabs 311 of the plurality of electrode assemblies 31 are equivalent to being gathered towards the direction of the accommodation groove 5. However, when the second conductive section 416 is located outside the accommodation groove 5, the tabs 311 of the plurality of electrode assemblies 31 are gathered towards the direction outside the accommodation groove 5.

[0315] For example, when the tab portion 33 is connected to the third conductive section 417 of the conductive member 41, the tabs 311 of the plurality of electrode assemblies 31 can be gathered towards the direction of the third conductive section 417. In this case, the third conductive section 417 can be located in the accommodation groove 5 or outside the accommodation groove 5. When the third conductive section 417 is located in the accommodation groove 5, the tabs 311 of the plurality of electrode assemblies 31 are equivalent to being gathered towards the direction of the accommodation groove 5. However, when the third conductive section 417 is located outside the accommodation groove 5, the tabs 311 of the plurality of electrode assemblies 31 are gathered towards the direction outside the accommodation groove 5.

[0316] Referring again to FIG. 7, in some embodiments of the present application, the side surface of the pole body 21 facing the electrode component 3 is the inner end surface 211 of the pole body 21, and the inner end surface 211 of the pole body 21 participates in forming the accommodation groove 5. At least part of the gathering portion 313 is laid on and connected (e.g., welded, bonded, or connected by punching) to the inner end surface 211 of the pole body 21. In this case, “laying” refers to that at least part of the side surface in the thickness direction of the gathering portion 313 is in face-to-face contact with the inner end surface 211 of the pole body 21.

[0317] Thus, by pre-connecting (e.g. ultrasonic welding) the multi-layer tab sheet 311 in the tab portion 33 to form the gathered portion 313, the gathered portion 313 can present a sheet shape in which the multi-layer tab sheet 311 is connected together and has a certain rigidity, rather than a fluffy and loose multi-layer foil shape, thereby facilitating the mating connection of the tab portion 33 with the pole body 21, making the welding of the tab portion 33 with the pole body 21 more reliable, and the welding seam less likely to form pores, which can improve the connection reliability and conductivity of the welding, making the conduction of the electrode component 3 with the pole component 2 more stable and reliable. Moreover, by laying at least part of the gathered portion 313 on the inner end face 211 of the pole body 21, the connection area of the tab portion 33 with the pole body 21 can be increased, improving the connection reliability and current carrying capacity.

[0318] Please refer to Fig. 7 again, in some embodiments of the present application, the gathered portion 313 is completely laid on the inner end face 211 of the pole body 21. That is, the inner end face 211 of the pole body 21 is greater than or equal to the area of the gathered portion 313, so that the gathered portion 313 can completely fall on the inner end face 211 of the pole body 21, so that the gathered portion 313 can be in a completely flat and flat state, and the projection of the gathered portion 313 completely falls on the inner end face 211 of the pole body 21, so that the tab portion 33 is not damaged due to bending the gathered portion 313, improving the charging performance of the tab portion 33, and facilitating the increase of the connection area of the inner end face 211 of the pole body 21 with the gathered portion 313, improving the current carrying efficiency, and facilitating the compression of the gathered portion 313 by the welding nozzle, improving the connection reliability of the gathered portion 313 with the pole body 21.

[0319] Exemplarily, referring to Fig. 28, Fig. 28 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application; when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, and the inner end face 211 of the pole body 21 is smaller than the area of the gathered portion 313, a part of the gathered portion 313 can be laid on the inner end face 211 of the pole body 21, and the rest part can be laid on the surrounding area 2201, at this time, the gathered portion 313 can also be in a completely flat and flat state.

[0320] In some embodiments of the present application, please refer to Fig. 5 again, the tab portion 33 is connected with the pole body 21 through the conductive piece 41, and at least part of the conductive piece 41 is accommodated in the accommodation groove 5. Thus, by indirectly connecting the tab portion 33 with the pole body 21 through the conductive piece 41, the length of the tab portion 33 can be shortened, and the problems such as wrinkling, bending and breaking of the tab sheet 311 can be improved, and by flexibly designing the shape and material of the conductive piece 41, the connection difficulty of the conductive piece 41 with the pole body 21 can be reduced, and the connection convenience of the conductive piece 41 with the pole body 21 can be improved.

[0321] Exemplarily, the lamination part 312 can be connected with the conductive member 41, so that the step of connecting the lamination part 312 to form the gathering part 313 can be omitted. Alternatively, exemplarily, the gathering part 313 can be formed by connecting the multiple layers of the tab sheet 311 in the lamination part 312, and then the gathering part 313 can be connected with the conductive member 41, so that the structure of the conductive member 41 can be designed flexibly and diversely.

[0322] Exemplarily, referring to FIG. 5 again, the conductive member 41 can be connected with the inner end surface 211 of the pole body 21, so that the length of the conductive member 41 can be shortened. For example, the conductive member 41 can include a second connecting section 412, which can be laid on and connected with the inner end surface 211 of the pole body 21, so that the connection reliability and charging performance of the conductive member 41 and the pole body 21 can be improved. Alternatively, exemplarily, the conductive member 41 can be connected with other positions of the pole body 21, for example, the conductive member 41 can be embedded in the pole body 21, or can be penetrated through the pole body 21 to be connected with the pole body 21, and the like.

[0323] In some embodiments of the present application, referring to FIGS. 29A-29D, which are process flow diagrams of a battery cell provided in an embodiment of the present application, the conductive member 41 includes a first connecting section 411, which includes two clamping parts 4110, and the tab part 33 includes a tab end part 331, which is clamped between the two clamping parts 4110 and connected (for example, welded, connected by punching, connected by conductive glue, and the like) with the clamping parts 4110. The tab end part 331 can be the lamination part 312 or the gathering part 313. In this way, the two clamping parts 4110 can be used to limit the tab end part 331, so that the connection reliability of the multiple layers of the tab sheet 311 in the tab end part 331 can be improved. In addition, in some examples, by arranging the two clamping parts 4110, the tab end part 331 clamped between the two clamping parts 4110 can be in the state of the lamination part 312, so that the step of connecting the multiple layers of the tab sheet 311 in the lamination part 312 to form the gathering part 313 can be omitted, thereby simplifying the processing procedure and improving the processing efficiency.

[0324] Please refer to FIG. 29A-29D again, exemplarily, the conductive piece 41 comprises a second connecting segment 412, the second connecting segment 412 is laid on and connected with the inner end face 211 of the pole body 21, and the conductive piece 41 is bent at the connecting position of the first connecting segment 411 and the second connecting segment 412, so that the first connecting segment 411 is located at the side of the second connecting segment 412 which is away from the pole body 21 (or the side which is towards the active material coating part 32), and one clamping part 4110 is supported at the side of the tab end part 331 which is away from the pole body 21 (or the side which is towards the active material coating part 32). Thus, through the support of the clamping part 4110 to the tab part 33, the redundancy of the tab part 33 can be improved, and the risk of short circuit caused by the tab part 33 being inserted into the active material coating part 32 in reverse can be reduced. Moreover, the bent conductive piece 41 can play a role of buffering support, the risk of the electrode part 3 hitting the first shell wall 111 can be reduced, and the reliability of the battery monomer 102 can be improved.

[0325] In addition, in order to facilitate bending, the conductive piece 41 can be provided in a form of material reduction at the connecting position of the first connecting segment 411 and the second connecting segment 412, for example, the width can be reduced, or the thickness can be thinned, etc., so that the first connecting segment 411 and the second connecting segment 412 can have certain rigidity respectively, the connection of the first connecting segment 411 with the tab part 33 is facilitated, the connection of the second connecting segment 412 with the pole body 21 is facilitated, and the bending of the conductive piece 41 at the connecting position of the first connecting segment 411 and the second connecting segment 412 is facilitated.

[0326] In some embodiments of the present application, please refer to FIG. 30A-30C, which are the process exploded view of the battery monomer provided by an embodiment of the present application, the tab part 33 comprises a folding part 313 formed by stacking and connecting multiple tab sheets 311, and the conductive piece 41 comprises a first connecting segment 411, the folding part 313 is stacked on one side of the first connecting segment 411 in the thickness direction and connected with the first connecting segment 411. Among them, the first connecting segment 411 is in the form of a sheet, the thickness direction of the first connecting segment 411 is consistent with that of the folding part 313, and the two are stacked along the thickness direction of the first connecting segment 411, so that the folding part 313 and the conductive piece 41 are matched in a simple way, which is conducive to improving the production efficiency.

[0327] Please refer to FIG. 30A-30C again, exemplarily, the first connecting segment 411 is supported at the side of the folding part 313 which is away from the pole body 21, so that the folding part 313 is clamped between the inner end face 211 of the pole body 21 and the first connecting segment 411. Thus, through the support of the first connecting segment 411 to the folding part 313, the redundancy of the tab part 33 can be improved, and the risk of short circuit caused by the tab part 33 being inserted into the active material coating part 32 in reverse can be reduced.

[0328] In some embodiments of the present application, referring to Fig. 5 again, the conductive part 4 is bent to form at least two open grooves 42, the openings of the two open grooves 42 are opposite to each other and adjacent in the direction from the pole body 21 to the active material coated part 32 (for example, as shown in Fig. 5, the opening of one of the two open grooves 42 adjacent to each other is to the left, and the opening of the other is to the right). In this way, the conductive part 4 can present a reciprocatingly bent serpentine shape, and the conductive part 4 can play a buffering role, which can reduce the impact of the active material coated part 32 on the first shell wall 111 in a vibrating environment, thereby protecting the electrode component 3 and improving the reliability of the battery monomer 102. Moreover, since the conductive part 4 is not irregularly extended, the risk of mutual interference and scratching between the tab 311 and the tab 311 in the conductive part 4, as well as the risk of the tab 311 being inserted into the active material coated part 32, can be reduced, thereby further improving the reliability of the battery monomer 102.

[0329] Exemplarily, referring to Fig. 5 again, when the conductive part 4 includes the tab part 33 and the conductive piece 41 connected with the tab part 33, and the tab part 33 is connected with the pole body 21 through the conductive piece 41, the conductive piece 41 and the tab part 33 are bent to form two open grooves 42 with opposite openings and adjacent to each other, for example, an open groove 42 is defined between the first connecting segment 411 and the second connecting segment 412, and the first connecting segment 411 and the tab part 33 define another open groove 42. In this way, the conductive part 4 can present a reciprocatingly bent S shape, thereby shortening the length of the conductive part 4, simplifying the structure of the conductive part 4, and facilitating the processing of the conductive part 4. Alternatively, referring to Fig. 23, when the conductive part 4 is connected with the pole body 21 through the tab part 33, the tab part 33 is bent to form two open grooves 42 with opposite openings and adjacent to each other.

[0330] In some embodiments of the present application, referring to Fig. 3 again, the battery monomer 102 further comprises a pressure relief device 6, and the pressure relief device 6 is arranged in the shell component 1. Exemplarily, the pressure relief device 6 can be an explosion-proof valve mounted on the shell component 1, or a thinned area integrally formed on the shell component 1. In this way, by arranging the pressure relief device 6, when the pressure in the shell component 1 exceeds a predetermined value, the pressure relief device 6 can be used to direct the pressure relief, thereby improving the safety and reliability of the battery monomer 102.

[0331] Exemplarily, in combination with FIG. 3, the pressure relief device 6 and the pole part 2 are located on the same side. Since the pole part 2 is arranged on the first shell wall 111, when the pressure relief device 6 is also arranged on the first shell wall 111, the pressure relief device 6 and the pole part 2 are located on the same side, for example, both are arranged on the top of the battery monomer 102, or both are arranged on the bottom of the battery monomer 102, or both are arranged on the same side of the battery monomer 102, etc. Thus, the design of other shell walls except the first shell wall 111 can be simplified, and the structure and processing of the battery monomer 102 are simplified. Among them, the shell part 1 can be surrounded by multiple non-coplanar walls, for example, the cuboid-shaped shell part 1 is surrounded by six walls, one of which is the first shell wall 111. Arranging the pressure relief device 6 and the pole part 2 on the same wall can make them located on the same side.

[0332] Exemplarily, in combination with FIG. 6, the pressure relief device 6 and the pole part 2 are located on different sides. Since the pole part 2 is arranged on the first shell wall 111, when the pressure relief device 6 is arranged on other walls of the shell part 1 except the first shell wall 111, for example, the first shell wall 111 is arranged at the end of the shell body 11 opposite to the opening 113, the pressure relief device 6 is arranged on the second shell wall 114, or the pressure relief device 6 is arranged on the shell cover 12, the pressure relief device 6 and the pole part 2 are located on different sides. Thus, without considering the space occupied by the pressure relief device 6 on the first shell wall 111 to reduce the volume of the pole part 2, the shape and area of the pole part 2 can be flexibly designed as needed. Among them, the shell part 1 can be surrounded by multiple non-coplanar walls, for example, the cuboid-shaped shell part 1 is surrounded by six walls, one of which is the first shell wall 111. Arranging the pressure relief device 6 on any other wall except the first shell wall 111 and arranging the pole part 2 on the first shell wall 111 can make them located on different sides.

[0333] According to the second aspect of the present application, the embodiments of the present application also provide a battery 100 comprising the battery monomer 102 of any of the above-mentioned schemes. It is worth noting that the battery 100 according to the embodiments of the present application can include a box body 101, or can not include a box body 101. Thus, since the reliability of the battery monomer 102 according to the embodiments of the present application is improved, the performance of the battery 100 is improved.

[0334] Exemplarily, the battery 100 can further comprise a busbar part, and the plurality of battery monomers 102 are electrically connected by the busbar part. Thus, the series and / or parallel connection of the plurality of battery monomers 102 can be realized. For example, when the plurality of battery monomers 102 are connected in series, the pole part 2 of the negative electrode of one battery monomer 102 and the pole part 2 of the positive electrode of the next battery monomer 102 are connected by one busbar part, and at the same time, the pole part 2 of the positive electrode of the battery monomer 102 and the pole part 2 of the negative electrode of the previous battery monomer 102 are connected by another busbar part.

[0335] Exemplarily, in combination with FIG. 2, the battery 100 includes a box body 101, the battery cells 102 are multiple and are contained in the box body 101, a bottom of the box body 101 is a box bottom plate 1013. The pole part 2 is arranged at a side of the shell part 1 facing the box bottom plate 1013, or is arranged at a side of the shell part 1 away from the box bottom plate 1013.

[0336] During use of the battery 100, for example, vehicle-mounted use, the box bottom plate 1013 is at a bottom of the box body 101 in a gravity direction, so that when the pole part 2 is arranged at the side of the shell part 1 facing the box bottom plate 1013, it is indicated that the pole part 2 is at a bottom of the shell part 1 in the gravity direction; and when the pole part 2 is arranged at the side of the shell part 1 away from the box bottom plate 1013, it is indicated that the pole part 2 is at a top of the shell part 1 in the gravity direction. Thus, the relative position of the pole part 2 and the box bottom plate 1013 is not limited, and flexible setting of the orientation of the battery cells 102 and the box body 101 can be realized.

[0337] Among them, when the pole part 2 of the battery cell 102 is arranged at the side of the shell part 1 facing the box bottom plate 1013, the battery cell 102 is in an inverted state, and the product of pressure relief is sprayed towards the direction away from the passenger compartment, which is safer; when the pole part 2 of the battery cell 102 is arranged at the side of the shell part 1 close to the box bottom plate 1013, the battery cell 102 is in a normal state, and the electrolyte is not easy to leak.

[0338] According to the third aspect embodiment of the present application, the present application further provides a power utilization device, which includes the battery 100 of any of the above-mentioned schemes, and the battery 100 is used to provide power for the power utilization device. The power utilization device can be any of the above-mentioned devices or systems using the battery 100. Since the performance of the battery 100 is improved, the working power performance of the power utilization device is improved.

[0339] Next, the battery cell 102 according to one specific embodiment of the present application is described.

[0340] In combination with FIG. 5, the shell part 1 has a containing cavity 13, the shell part 1 includes a shell body 11 and a shell cover 12, one end of the shell body 11 has an opening 113, the shell cover 12 is arranged on the opening 113 of the shell body 11 to jointly form the containing cavity 13 with the shell body 11, and the first shell wall 111 has a mounting hole 112; the pole part 2 is mounted on the first shell wall 111 and is arranged at the mounting hole 112, and the end of the shell body 11 opposite to the opening 113 is the first shell wall 111. Alternatively, the shell cover 12 can also be the first shell wall 111.

[0341] The pole post component 2 is in a simple self-sealing form, and includes a pole post body 21, a first adapter structure 22a and a first insulation structure 23a. The outer ring of the adapter structure 22 is welded to the first shell wall 111. The first adapter structure 22a surrounds the pole post body 21 and is connected to the first shell wall 111. The first insulation structure 23a is insulated and sealingly fitted between the first adapter structure 22a and the pole post body 21.

[0342] The first adapter structure 22a is raised relative to the first shell wall 111 in a direction away from the electrode component 3, so as to form a first accommodating groove 51 around the pole post component 2, which is concave in a direction away from the active material coating portion 32 and open in a direction towards the active material coating portion 32. A side surface of the pole post body 21 towards the active material coating portion 32 is an inner end surface 211 of the pole post body 21, which forms a partial groove wall of the first accommodating groove 51.

[0343] The electrode component 3 includes a plurality of electrode assemblies 31 stacked together, so as to have the active material coating portion 32 accommodated in the accommodating cavity 13, and a tab portion 33 connected to the active material coating portion 32. The tab portion 33 is connected to the pole post body 21 through a conductive member 41, at least a portion of which is located in the first accommodating groove 51 and connected to the inner end surface 211 of the pole post body 21.

[0344] The conductive member 41 includes a first connecting section 411 and a second connecting section 412. The first connecting section 411 includes two clamping portions 4110, and the tab end portion 331 of the tab portion 33 is clamped between the two clamping portions 4110 and welded to the clamping portions 4110. The second connecting section 412 is laid on the inner end surface 211 of the pole post body 21 and welded to the inner end surface 211 of the pole post body 21. The conductive member 41 is bent at the connecting position of the first connecting section 411 and the second connecting section 412, so that the first connecting section 411 is located on a side of the second connecting section 412 away from the pole post body 21, and one of the clamping portions 4110 is supported on a side of the tab end portion 331 away from the pole post body 21.

[0345] In the process of processing, the plurality of electrode assemblies 31 can be stacked first, and the plurality of electrode assemblies 31 are gathered together with the same polarity of the tab 311 and welded with the first connecting section 411 of the conductive part 41 at the same time, so as to improve the problem that the tab 311 is caused to form tensile stress between the tabs 311 due to the asynchronization of the electrode assemblies 31, and the welding position of the tab part 33 and the first connecting section 411 is cracked. Then, the electrode part 3 is installed in the shell body 11, the second connecting section 412 of the pole body 21 is extended from the mounting hole 112 on the shell body 11, and then the second connecting section 412 is installed in the first accommodating groove 51 outside the shell body 11 and welded with the inner end surface 211 of the pole body 21, and then the pole part 2 is arranged on the mounting hole 112 outside the shell body 11, and the pole part 2 is welded with the first shell wall 111, and the sealing of the mounting hole 112 is completed after the welding is completed.

[0346] Therefore, by arranging the accommodating groove 5 to accommodate the conductive part 4, the space occupied by the conductive part 4 in the accommodating cavity 13 can be reduced, so that the accommodating cavity 13 has more 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 monomer 102. Moreover, since the accommodating groove 5 is open towards the direction of the electrode part 3, the conductive part 4 can easily extend into the accommodating groove 5, thereby reducing the operation difficulty.

[0347] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0348] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, wherein, The application relates to a shell component, an electrode component and a post component. The shell component has a receiving cavity and comprises a first shell wall participating in forming the receiving cavity. The electrode component is accommodated in the receiving cavity. The post component is located on the same side of the first shell wall as the electrode component and is mounted on the first shell wall. The post component is connected with the electrode component through a conductive part.

2. The battery cell of claim 1, wherein, The post component is provided with a receiving groove in communication with the receiving cavity.

3. The battery cell of claim 1 or 2, wherein, The receiving groove is open towards the electrode component and is at least partially formed by the post component.

4. The battery cell of any one of claims 1-3, wherein, The receiving groove is recessed relative to the first shell wall away from the electrode component.

5. The battery cell of claim 4, wherein, The post component comprises a post body connected with the conductive part.

6. The battery cell of claim 5, wherein, The inner end surface of the post body towards the electrode component is an inner end surface of the post body.

7. The battery cell of claim 6, wherein, The inner end surface of the post body and the inner end surface of the first adapter structure jointly form the receiving groove.

8. The battery cell of claim 7, wherein, The first adapter structure surrounds the post body and is connected with the first shell wall.

9. The battery cell of claim 7 or 8, wherein, The first insulating structure is insulatingly and sealingly fitted between the first adapter structure and the post body. The conductive part is connected with the post body.

10. The battery cell of claim 9, wherein, The receiving groove comprises a first receiving groove formed by the post body and the first adapter structure. The outer contour of the orthographic projection of the first receiving groove on the first shell wall is located at the periphery of the outer contour of the orthographic projection of the post body on the first shell wall. The first receiving groove is formed on the side of the post body and the first adapter structure towards the electrode component. The first adapter structure is raised relative to the first shell wall away from the electrode component so that the first receiving groove is recessed relative to the first shell wall away from the electrode component. The inner end surface of the post body and the inner end surface of the first adapter structure jointly form the first receiving groove. The first adapter structure comprises a first adapter ring and a second adapter ring. The second adapter ring is arranged on the side of the first adapter ring away from the electrode component. The outer ring of the first adapter ring is connected with the first shell wall. The inner ring of the first adapter ring and the inner ring of the second adapter ring jointly hold the post body through the first insulating structure. The first receiving groove is formed on the side of the first adapter ring and the post body towards the electrode component. The first adapter ring is raised relative to the first shell wall away from the electrode component so that the first receiving groove is recessed relative to the first shell wall away from the electrode component. The second adapter ring is connected with the raised part of the first adapter ring. The post body comprises a peripheral part. The first insulating structure comprises a sealing structure. The sealing structure is an integral part and is simultaneously held between the first adapter ring and the peripheral part and between the second adapter ring and the peripheral part. The first insulating structure further comprises a first insulating part. The sealing structure is held between the first adapter ring and the peripheral part. The second adapter ring is insulatingly and fixedly fitted with the post body through the first insulating part.

11. The battery cell of claim 7 or 8, wherein, The first adapter structure comprises a third adapter ring, an outer ring of the third adapter ring is connected with the first shell wall, the third adapter ring comprises a first extension and a second extension which are integrally arranged, the second extension is connected on a side of the first extension which is away from the electrode component, the first extension and the second extension are clamped on the pole body through the first insulation structure; The first accommodating groove is formed on a side of the third adapter ring and the pole body which is towards the electrode component, the third adapter ring is raised relative to the first shell wall in a direction away from the electrode component, so that the first accommodating groove is recessed relative to the first shell wall in a direction away from the electrode component.

12. The battery cell of claim 11, wherein, The pole body comprises a peripheral portion, and the first insulation structure comprises a sealing structure; The sealing structure is an integrally formed member, and is clamped between the first extension and the peripheral portion, and between the second extension and the peripheral portion; or The first insulation structure further comprises a first insulation member, the sealing structure is clamped between the first extension and the peripheral portion, and the first insulation member is clamped between the second extension and the peripheral portion.

13. The battery cell of claim 7 or 8, wherein, The first adapter structure comprises a fourth adapter ring, the fourth adapter ring comprises a fitting ring portion, the pole body is arranged in the fitting ring portion and is clamped on both inner and outer sides of the fitting ring portion through the first insulation structure; The first accommodating groove is formed on a side of the fourth adapter ring and the pole body which is towards the electrode component, the fourth adapter ring is raised relative to the first shell wall in a direction away from the electrode component, so that the first accommodating groove is recessed relative to the first shell wall in a direction away from the electrode component.

14. The battery cell of claim 13, wherein, The pole body comprises a penetrating portion which is arranged in the fitting ring portion, and an inner limiting portion and an outer limiting portion which are connected with the penetrating portion and are clamped on both inner and outer sides of the fitting ring portion; the first insulation structure comprises a sealing structure; The sealing structure is an integrally formed member, and is clamped between the inner limiting portion and the fitting ring portion, and between the outer limiting portion and the fitting ring portion; or The first insulation structure further comprises a second insulation member, the sealing structure is clamped between the fitting ring portion and the inner limiting portion, and the second insulation member is clamped between the outer limiting portion and the fitting ring portion.

15. The battery cell of any one of claims 4-14, wherein, Both the inner end surface of the pole body and the inner end surface of the first adapter structure participate in surrounding the first accommodating groove, a surrounding area of the first adapter structure which is adjacent to the pole body is a surrounding area of the pole body, and the surrounding area is flush with the inner end surface of the pole body.

16. The battery cell of any one of claims 4-14, wherein, Both the inner end surface of the pole body and the inner end surface of the first adapter structure participate in surrounding the first accommodating groove, a surrounding area of the first adapter structure which is adjacent to the pole body is a surrounding area of the pole body, and the inner end surface of the pole body protrudes from the surrounding area in a direction towards the electrode component.

17. The battery cell of any one of claims 4-16, wherein, The first adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the profile shape of the pole body matches the profile shape of the first adapter structure.

18. The battery cell of claim 15, wherein, The first adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the pole body is arranged in the center of the first adapter structure and has a circular profile.

19. The battery cell of claim 16, wherein, The first adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the pole body is arranged in the center of the first adapter structure and has a circular profile. The conductive part includes a tab part and a conductive member connected with the tab part, the conductive member includes a first conductive segment laid on the inner end surface of the pole body, and a second conductive segment staggered with the inner end surface of the pole body, the second conductive segment protrudes in a direction away from the electrode component relative to the first conductive segment, and the tab part is connected with the second conductive segment.

20. The battery cell of claim 4, wherein, The outer contour of the orthographic projection of the first accommodating groove on the first shell wall is within the outer contour range of the orthographic projection of the pole body on the first shell wall.

21. The battery cell according to claim 4, wherein, The first adapter structure includes a surrounding part on the side of the pole body close to the electrode component, the surrounding part surrounds an avoiding hole, the pole body is arranged on the side of the avoiding hole away from the electrode component, the first accommodating groove includes a first recess formed by the surrounding part and the pole body and recessed in a direction away from the electrode component, the conductive part is connected with the pole body through the first recess, and the outer contour of the orthographic projection of the first recess on the first shell wall is within the outer contour range of the orthographic projection of the pole body on the first shell wall.

22. The battery cell of claim 21, wherein, The first adapter structure protrudes in a direction away from the electrode component relative to the first shell wall to define a base groove recessed in a direction away from the electrode component relative to the first shell wall, the base groove is open in a direction toward the electrode component and is connected on the side of the first recess toward the electrode component, and the conductive part extends into the first recess through the base groove and is connected with the pole body.

23. The battery cell of claim 4, wherein, The pole body includes a first pole member and a second pole member, the second pole member is connected with the first adapter structure and defines a fitting hole, the first pole member is arranged on the side of the second pole member away from the electrode component and covers the fitting hole, the first accommodating groove includes a second recess formed by the first pole member and the second pole member, and the outer contour of the orthographic projection of the second recess on the first shell wall is within the outer contour range of the orthographic projection of the pole body on the first shell wall.

24. The battery cell of claim 23, wherein, The first adapter structure protrudes in a direction away from the electrode component relative to the first shell wall to define a base groove recessed in a direction away from the electrode component relative to the first shell wall, the base groove is open in a direction toward the electrode component and is connected on the side of the second recess toward the electrode component, and the conductive part extends into the second recess through the base groove and is connected with the pole body.

25. The battery cell of any one of claims 1-3, wherein, The pole piece cover is arranged on a side of the first shell wall away from the electrode piece, the pole piece includes a pole body, a second adapter structure and a second insulation structure, the second adapter structure surrounds the pole body and is connected with the first shell wall, the second insulation structure is insulatively fitted between the second adapter structure and the pole body, and the conductive part is connected with the pole body; The first shell wall has a mounting hole, a sealing ring is arranged around the mounting hole, the sealing ring is clamped between the pole piece and the first shell wall, the pole piece and the sealing ring surround a second accommodating groove recessed in a direction away from the electrode piece, and the accommodating groove includes the second accommodating groove.

26. The battery cell of any one of claims 1-3, wherein, The pole piece includes a pole body, the conductive part is connected with the pole body, the pole body includes a first pole piece and a second pole piece, the second pole piece is connected with the first shell wall and defines a fitting hole, the first pole piece is assembled on a side of the second pole piece away from the electrode piece, and the accommodating groove includes a third accommodating groove surrounded by the first pole piece and the second pole piece.

27. The battery cell of claim 3, wherein, An inner end surface of the pole body includes a fitting area participating in defining a groove wall of the accommodating groove, the conductive part is connected with the fitting area through the accommodating groove, and the fitting area is formed as an elongated area extending along a length direction of the first shell wall.

28. The battery cell of claim 3, wherein, An inner end surface of the pole body includes a fitting area participating in defining a groove wall of the accommodating groove, the conductive part includes a tab part and a conductive piece connected with the tab part, and the conductive piece is connected with the fitting area through the accommodating groove.

29. The battery cell of claim 28, wherein, 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 a direction of the electrode piece relative to the first conductive segment, and the tab part is connected with the third conductive segment.

30. The battery cell of any one of claims 1-29, wherein, The first shell wall includes a raised structure raised in a direction away from the electrode piece, the mounting hole is formed through the raised structure, the pole piece is arranged at the mounting hole and surrounds a fourth accommodating groove recessed in a direction away from the electrode piece with the raised structure, and the accommodating groove includes the fourth accommodating groove.

31. The battery cell of claim 1, wherein, The electrode piece includes an active material coated part accommodated in the accommodating cavity, and a tab part connected with the active material coated part, at least part of the tab part is accommodated in the accommodating groove and extends to the pole piece and is connected with the pole piece.

32. The battery cell of claim 31, wherein, The pole piece includes a pole body, an inner end surface of the pole body on a side facing the electrode piece is an inner end surface of the pole body, the inner end surface of the pole body participates in surrounding the accommodating groove, the tab part includes a gathered part formed by stacking and connecting a plurality of tab sheets, and at least part of the gathered part is laid on and connected with the inner end surface of the pole body.

33. The battery cell of claim 32, wherein, The gathered part is completely laid on the inner end surface of the pole body.

34. The battery cell of claim 1, wherein, The electrode component includes an active material coated portion accommodated in the accommodation cavity, and a tab portion connected to the active material coated portion, the conductive portion includes a conductive member and the tab portion, the tab portion is connected to the pole post component through the conductive member, and at least part of the conductive member is accommodated in the accommodation groove.

35. The battery cell of claim 34, wherein, The conductive member includes a first connecting section, the first connecting section includes two clamping portions, the tab portion includes a tab end portion, the tab end portion is clamped between the two clamping portions, and the tab end portion is connected to the clamping portions.

36. The battery cell of claim 35, wherein, The pole post component includes a pole post body, a surface of an end of the pole post body facing the electrode component is an inner end surface of the pole post body, the conductive member includes a second connecting section, the second connecting section is laid on and connected to the inner end surface of the pole post body, the conductive member is bent at a connecting position of the first connecting section and the second connecting section, so that the first connecting section is located on a side of the second connecting section away from the pole post body, and one of the clamping portions is supported on a side of the tab end portion away from the pole post body.

37. The battery cell of claim 34, wherein, The tab portion includes a folded portion formed by stacking and connecting multiple tab sheets, the conductive member includes a first connecting section, and the folded portion is stacked on one side of the first connecting section in a thickness direction and connected to the first connecting section.

38. The battery cell of claim 37, wherein, The pole post component includes a pole post body, a surface of an end of the pole post body facing the electrode component is an inner end surface of the pole post body, the first connecting section is supported on a side of the folded portion away from the pole post body, so that the folded portion is clamped between the inner end surface of the pole post body and the first connecting section.

39. The battery cell of any one of claims 1-38, wherein, The pole post component includes a pole post body, the electrode component includes an active material coated portion accommodated in the accommodation cavity, the active material coated portion is connected to the pole post body through the conductive portion, the conductive portion is bent to form at least two open grooves, openings of the two open grooves face different directions and are adjacent in a direction from the pole post body to the active material coated portion.

40. The battery cell of claim 39, wherein, The electrode component includes a tab portion connected to the active material coated portion, the conductive portion is connected to the pole post body through the tab portion, the tab portion is bent to form two open grooves with openings facing opposite directions and being adjacent; or, the electrode component includes a tab portion connected to the active material coated portion, the conductive portion includes the tab portion and a conductive member connected to the tab portion, the tab portion is connected to the pole post body through the conductive member, and the conductive member and the tab portion are bent to form two open grooves with openings facing opposite directions and being adjacent.

41. The battery cell of any one of claims 1-40, wherein, The electrode component includes multiple electrode assemblies stacked, and tab sheets of the multiple electrode assemblies are gathered in a direction of the accommodation groove.

42. The battery cell of any one of claims 1-41, wherein, The shell component includes a shell body participating in surrounding the accommodation cavity, the shell body is a semi-closed cylinder and has an opening at one end, and an end of the shell body opposite to the opening serves as the first shell wall; or, the shell component includes a shell cover participating in surrounding the accommodation cavity, the shell cover is a flat plate and serves as the first shell wall.

43. The battery cell of any one of claims 1-42, wherein, A pressure relief device is also included, which is provided on the housing member and is located on the same side or on the opposite side of the pole member.

44. A battery, wherein, The battery includes a plurality of battery cells according to any one of claims 1-43.

45. The battery of claim 44, wherein, The battery includes a box body, the battery cells are accommodated in the box body, a bottom of the box body is a box bottom plate, the pole member is provided on a side of the housing member facing the box bottom plate or on a side of the housing member facing away from the box bottom plate.

46. An electrical device, comprising: The battery includes a plurality of battery cells according to any one of claims 44 or 45.

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