Battery cells, batteries and electrical devices

Abstract

A battery cell, a battery, and an electrical device are disclosed, belonging to the field of battery technology. The battery cell includes a housing component, a terminal post component, and an electrode component. The housing component includes a first housing wall with mounting holes. The electrode component is housed within the housing component. The terminal post component is located on the same side as the first housing wall and is mounted at the mounting holes. The terminal post component includes a terminal post body, a connecting structure, and an insulating and sealing structure. The terminal post body is connected to the electrode component. The connecting structure surrounds the terminal post body and is connected to the first housing wall. The insulating and sealing structure is insulating and sealingly fitted between the connecting structure and the terminal post body. Therefore, the terminal post component itself has self-sealing properties. Thus, when installing the terminal post component onto the first housing wall, it is not necessary to apply a large force to the terminal post component to ensure a seal at the connection between the connecting structure and the first housing wall, thereby improving the stress deformation problem of the first housing wall.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. Power batteries consist of several battery cells, but the material cost of these cells needs to be reduced. Utility Model Content

[0003] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can reduce the material cost of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell component, a pole component and an electrode component, the shell component comprising a first shell wall, the first shell wall being formed with a mounting hole; the electrode component being accommodated in the shell component; the pole component and the first shell wall being located on the same side of the electrode component and being mounted at the mounting hole, the pole component comprising a pole body, a transition structure and an insulating sealing structure, the pole body being connected to the electrode component, the transition structure surrounding the pole body and being connected to the first shell wall, and the insulating sealing structure being insulated and sealed between the transition structure and the pole body.

[0005] In the above technical solution, on the one hand, since the pole component includes not only the pole body connected to the electrode component, but also the transition structure connected to the first shell wall, and an insulating sealing structure is provided between the transition structure and the pole body, the connection between the pole body and the transition structure plays an insulating and sealing role, so that the pole component itself has self-sealing properties, which can facilitate the installation and matching of the pole component and the shell component, and can save installation time and cost; on the other hand, in the conventional structure, the pole body needs to be pressed on the sealing member placed on the first shell wall to achieve the sealing of the shell component, but this sealing method is difficult to ensure the sealing. The required pre-tightening force is large, and the pressure applied by the pole component to the first shell wall is large. When the shell thickness is thin, it is easy to cause deformation or damage to the first shell wall. Therefore, through such an arrangement, when the pole component is installed on the first shell wall, there is no need to consider the insulation and sealing issues between the adapter structure and the first shell wall. It is only necessary to complete a reliable connection throughout the whole circle. Therefore, there is no need to apply a large force to the pole component in order to meet the sealing requirements of the connection between the adapter structure and the first shell wall, thereby improving the problem of stress deformation of the first shell wall, which is conducive to reducing the wall thickness of the shell, reducing material costs, reducing the weight of the battery cell, and improving energy density.

[0006] In some embodiments, the insulating sealing structure includes a sealing structure, at least a portion of which is clamped between the transition structure and the pole body in the inward and outward directions of the first shell wall.

[0007] In the above technical solution, by providing at least a portion of the sealing structure to be clamped between the transition structure and the pole body in the inward and outward directions of the first shell wall, an axial seal is achieved between the transition structure and the pole body. Utilizing the axial seal can provide a relatively reliable sealing effect, thereby improving the electrolyte leakage problem that occurs at the mating position between the transition structure and the pole body. Furthermore, if the pole component only includes the pole body, providing an axial seal between the pole body and the first shell wall requires applying sealing pressure along the axial direction of the mounting hole, which can result in excessive force on the first shell wall. However, by integrating the axial seal into the pole component, the embodiments of the present application can reduce the axial force acting on the first shell wall, thereby improving the reliability of the first shell wall and appropriately thinning the first shell wall to reduce costs and increase energy density.

[0008] In some embodiments, the insulating sealing structure includes a sealing structural member, which is disposed around a circumferential side of the transition structure close to the pole body.

[0009] In the above technical solution, by arranging the sealing structure around the inner ring of the transition structure, the sealing structure can be close to the matching position of the transition structure and the pole body, which is conducive to sealing the matching position of the transition structure and the pole body in a shorter path, improving the reliability of the seal, and is also conducive to reducing the size of the sealing structure, reducing the sealing area, and easily achieving compression sealing on it, making the seal less likely to fail and improving the sealing effect.

[0010] In some embodiments, the pole body includes a peripheral portion, and the transition structure is clamped on both sides of the peripheral portion in the inner and outer directions of the first shell wall through an insulating sealing structure. The insulating sealing structure includes a sealing structural member, which extends along the circumference of the peripheral portion and is clamped between the peripheral portion and the transition structure.

[0011] In the above technical solution, the pole component has a simple structure and is easy to manufacture, enabling simple and effective relative fixation and insulation between the pole body and the adapter structure. Furthermore, the sealing portion is clamped between the peripheral edge of the pole body and the adapter structure, allowing the sealing portion to be positioned where the adapter structure and the pole body meet. This facilitates sealing the adapter structure and the pole body in a shorter path, improving sealing reliability. Furthermore, the size of the sealing portion and the sealing area are reduced, making compression sealing easier and less likely to fail, thereby improving sealing effectiveness.

[0012] In some embodiments, at least a portion of the sealing structure is disposed on a side of the peripheral portion close to or away from the electrode component, so as to be clamped between the peripheral portion and the transition structure along the inward and outward direction of the first shell wall.

[0013] In the above technical solution, a relatively reliable sealing effect can be achieved between the transition structure and the pole body through axial sealing. If the pole component only includes the pole body, and an axial seal is provided between the pole body and the first shell wall, it is necessary to apply sealing pressure along the axial direction of the mounting hole, which will cause excessive force on the first shell wall. However, the embodiment of the present application can reduce the axial force on the first shell wall by integrating the axial seal into the pole component. In addition, when at least part of the sealing structure is provided on the side of the peripheral portion close to the electrode component, sealing can be performed from the side of the peripheral portion close to the accommodating cavity, which can more effectively suppress the leakage of electrolyte from the matching position of the pole body and the transition structure, thereby improving the sealing effect.

[0014] In some embodiments, the insulating sealing structure further includes a first insulating member, and the transition structure is clamped on both sides of the peripheral portion along the inner and outer directions through the first insulating member and the sealing structure member respectively.

[0015] In the above technical solution, because the insulating and sealing structure includes a first insulating member and a sealing structure that are not integrated into a single piece, the design and processing of the insulating and sealing structure can be simplified. Furthermore, depending on the specific requirements for coordination with the pole body and the transition structure, the first insulating member can be configured as a substantially incompressible insulating member without a sealing effect, or as a compressible sealing member with a sealing effect, thereby meeting different practical requirements.

[0016] In some embodiments, the sealing structure is an integral structure and outwardly surrounds the peripheral portion, so as to be located on the side of the peripheral portion close to the electrode component and the side away from the electrode component respectively, and the transition structure is clamped on both sides of the peripheral portion along the inner and outer directions by the sealing structure.

[0017] In the above technical solution, since the sealing structural member is an integral structural member and the peripheral portion is outsourced, the number of parts and the number of assembly steps can be reduced.

[0018] In some embodiments, the 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 close to or away from the electrode component, the second adapter ring is connected to the first adapter ring, and one of the first adapter ring and the second adapter ring is connected to the first shell wall; the end of the first adapter ring close to the pole body and the end of the second adapter ring close to the pole body are spaced along the inward and outward directions, so as to be clamped on both sides of the peripheral portion along the inward and outward directions by the insulating sealing structure respectively, and the sealing structure is clamped between at least one of the first adapter ring and the second adapter ring and the peripheral portion.

[0019] In the above technical solution, the adapter structure includes a first adapter ring and a second adapter ring that are arranged inside and outside and assembled and connected, thereby facilitating the assembly and connection of the adapter structure with the insulating sealing structure and the pole body, making the pole components easy to process and manufacture, and making it easy to control the compression amount of the sealing structure, thereby improving the sealing reliability.

[0020] In some embodiments, the insulating sealing structure further includes a first insulating member, at least a portion of the sealing structure member is clamped between the first adapter ring and the peripheral portion, and the second adapter ring is insulated and fixedly fitted to the peripheral portion through the first insulating member.

[0021] In the above technical solution, because the insulating and sealing structure includes a first insulating member and a sealing structure that are not integrated into a single piece, the design and processing of the insulating and sealing structure can be simplified. Furthermore, depending on the specific requirements for coordination with the pole body and the transition structure, the first insulating member can be configured as a substantially incompressible insulating member without a sealing effect, or as a compressible sealing member with a sealing effect, thereby meeting different practical requirements.

[0022] In some embodiments, the first insulating member and the pole body, as well as the first insulating member and the second adapter ring are respectively connected by injection molding.

[0023] In the above technical solution, the pole body can be easily processed, and reliable connection and insulation matching between the transition structure and the pole body can be achieved.

[0024] In some embodiments, the second adapter ring includes a stop ring portion, and at least a portion of the first insulating member is clamped between the stop ring portion and the peripheral portion along an inward-outward direction.

[0025] In the above technical solution, the second adapter ring is connected to the first adapter ring, and the first insulating member is clamped by the stop ring portion and the peripheral portion of the second adapter ring, thereby eliminating the injection molding process.

[0026] In some embodiments, the sealing structure is an integral structure and is surrounded by a peripheral portion, so as to be respectively located on a side of the peripheral portion close to the electrode component and a side away from the electrode component, and the first adapter ring and the second adapter ring are respectively clamped on both sides of the sealing structure away from the peripheral portion along the inward and outward directions.

[0027] In the above technical solution, since the sealing structural member is an integral structural member and the peripheral portion is outsourced, the number of parts and the number of assembly steps can be reduced.

[0028] In some embodiments, the first adapter ring is connected to the first shell wall, the second adapter ring is provided on a side of the first adapter ring away from the electrode component, and at least a portion of the sealing structure is clamped between the first adapter ring and the peripheral portion.

[0029] In the above technical solution, sealing can be performed from the side of the peripheral portion closest to the accommodating cavity, which can more effectively prevent electrolyte leakage from the mating position between the terminal body and the adapter structure, thereby improving the sealing effect. Furthermore, the terminal component of this structure can determine the relative positions of various parts of the terminal component and the first shell wall through the structural design of the first adapter ring, allowing for flexible design as needed to reduce the space occupied by the terminal component inside or outside the shell.

[0030] In some embodiments, the first adapter ring and the second adapter ring are both metal rings and are connected by welding, and the first adapter ring is connected by welding to the first shell wall.

[0031] In the above technical solution, the transition structure has good structural strength and is suitable for connection with the first shell wall made of metal material.

[0032] In some embodiments, the adapter structure further includes a first insulating frame connected to a side of the first adapter ring close to the electrode component.

[0033] In the above technical solution, the first insulating frame can be used to insulate between the electrode component and the first adapter ring, thereby reducing the difficulty of providing an insulating sealing structure there.

[0034] In some embodiments, a side surface of the first adapter ring close to the second adapter ring has a first annular groove matched with the second adapter ring, and the second adapter ring is embedded in the first annular groove.

[0035] In the above technical solution, the first annular groove is provided to position the second adapter ring, thereby improving the assembly efficiency and connection reliability of the first adapter ring and the second adapter ring.

[0036] In some embodiments, the adapter structure includes a third adapter ring, which includes a first extension portion and a second extension portion that are integrally arranged; the end of the first extension portion close to the pole body and the end of the second extension portion close to the pole body are spaced along the inward and outward directions, so as to be clamped on both sides of the peripheral portion along the inward and outward directions by the insulating sealing structure respectively, and the sealing structure is clamped between at least one of the first extension portion and the second extension portion and the peripheral portion.

[0037] In the above technical solution, since the third adapter ring includes an integrally arranged first extension portion and a second extension portion, the first extension portion and the second extension portion are integrated into the same structural component, thereby eliminating the process of connecting the first extension portion and the second extension portion, reducing the use of parts, and the first extension portion and the second extension portion are not easy to separate, which can improve the reliability of clamping the peripheral portion through the insulating sealing structure.

[0038] In some embodiments, the insulating sealing structure further includes a first insulating member, at least a portion of the sealing structure member is clamped between the first extension portion and the peripheral portion, and the second extension portion is insulated and fixedly fitted with the peripheral portion by the first insulating member.

[0039] In the above technical solution, since the insulating sealing structure includes the first insulating member and the sealing structure member which are not integrated into one piece, the design and processing of the insulating sealing structure can be simplified.

[0040] In some embodiments, the second extension portion rivets the first insulating member against the peripheral portion.

[0041] In this technical solution, the third adapter ring can be assembled with the pole body and the insulating seal structure without requiring any welding. Furthermore, when only the second extension is riveted to the first and second extensions, clamping the sealing structure between the first extension and the peripheral portion makes it easier to control the compression of the sealing structure, achieving a better compression effect.

[0042] In some embodiments, the first insulating member and the pole body, as well as the first insulating member and the second extension portion, are respectively connected by injection molding, and the first extension portion rivets the sealing structure against the peripheral portion.

[0043] In the above technical solution, the pole body can be easily processed, and reliable connection and insulation matching between the transition structure and the pole body can be achieved.

[0044] In some embodiments, the sealing structure is an integral structure and is surrounded by a peripheral portion, so as to be located on a side of the peripheral portion close to the electrode component and a side away from the electrode component, respectively. The first extension portion and the second extension portion are clamped on both sides of the sealing structure away from the peripheral portion in the inner and outer directions, respectively.

[0045] In the above technical solution, since the sealing structural member is an integral structural member and the peripheral portion is outsourced, the number of parts and the number of assembly steps can be reduced.

[0046] In some embodiments, one of the first extension portion and the second extension portion rivets the sealing structure against the peripheral portion.

[0047] In the above technical solution, the assembly of the third adapter ring, the pole body and the insulating sealing structure can be achieved without the need for an assembly welding process.

[0048] In some embodiments, one of the first extension portion and the second extension portion is a preformed portion, and the other is a riveted formed portion. The fixed end of the preformed portion is connected to the first shell wall, and the fixed end of the riveted formed portion is connected to the preformed portion. The riveted formed portion rivets the insulating sealing structure against the peripheral portion.

[0049] In the above technical solution, the third adapter ring can be clamped on the peripheral portion through the insulating sealing structure by pre-processing and riveting, thereby eliminating the need for assembly and welding processes.

[0050] In some embodiments, the preformed portion includes an outer ring portion and an inner ring portion, the outer ring portion is connected to the first shell wall and is arranged around the riveted forming portion and the inner ring portion, the inner ring portion and the riveted forming portion are respectively clamped on both sides of the peripheral portion along the inner and outer directions through an insulating sealing structure, and the riveted forming portion and the inner ring portion are respectively connected to the outer ring portion.

[0051] In the above technical solution, the third adapter ring has a simple structure and is easy to process and manufacture.

[0052] In some embodiments, the preformed portion includes an outer ring portion and a bent portion. The outer ring portion is connected to the first shell wall and is arranged around the riveted forming portion and the bent portion. The bent portion and the riveted forming portion are respectively clamped on both sides of the peripheral portion along the inner and outer directions through an insulating sealing structure, and the bent portion is bent and connected between the riveted forming portion and the outer ring portion.

[0053] In the above technical solution, the wall thickness and supporting capacity of the riveted forming portion and the bent portion are easy to ensure, which can better achieve the effect of compression and sealing.

[0054] In some embodiments, at least a portion of the sealing structure is clamped between the third adapter ring and a side of the peripheral portion close to the electrode component.

[0055] In the above technical solution, sealing can be performed from the side of the peripheral portion close to the accommodating cavity, which can more effectively prevent the electrolyte from leaking from the matching position of the pole body and the transition structure, thereby improving the sealing effect.

[0056] In some embodiments, the third adapter ring is an integrally formed metal ring, and the third adapter ring is welded to the first shell wall.

[0057] In the above technical solution, the third adapter ring has a simple structure, can construct an integrally arranged first extension portion and second extension portion, has good structural strength, and is suitable for connection with the first shell wall made of metal.

[0058] In some embodiments, the adapter structure further includes a second insulating frame connected to a side of the third adapter ring close to the electrode component.

[0059] In the above technical solution, the second insulating frame can be used to insulate between the electrode component and the third adapter ring, eliminating the need to provide an insulating sealing structure.

[0060] In some embodiments, the sealing structure includes a first portion, which is provided on a side of the peripheral portion close to the electrode component and is clamped between the peripheral portion and the transition structure along an inward-outward direction.

[0061] In the above technical solution, sealing can be performed from the side of the peripheral portion close to the accommodating cavity, which can more effectively prevent the electrolyte from leaking from the matching position of the pole body and the transition structure, thereby improving the sealing effect.

[0062] In some embodiments, the pole body includes a main body portion, a peripheral portion is arranged around the main body portion, and the main body portion protrudes relative to the peripheral portion toward the direction close to the electrode component. The sealing structure also includes a second part, which is connected to one end of the first part close to the main body portion and extends relative to the first part in the direction close to the electrode component to be spaced between the outer peripheral surface of the main body portion and the transition structure.

[0063] In the above technical solution, because the main portion of the terminal body protrudes relative to the peripheral portion toward the electrode component, the terminal body effectively reduces the space occupied by the external portion of the housing, thereby reducing the size of the battery cell in the direction in which the terminal component is disposed. Furthermore, by configuring the sealing structure to include a second portion spaced between the outer circumference of the main portion and the transition structure, insulation at this location can be achieved simply and effectively.

[0064] In some embodiments, the sealing structure also includes a third part, which is connected to the end of the first part that is away from the pole body, and extends to the peripheral area of ​​the peripheral part in the direction away from the electrode component relative to the first part, and is sealed between the outer peripheral surface of the peripheral part and the transition structure.

[0065] In the above technical solution, by setting the sealing structure to also include a third part that is sealed between the outer peripheral surface of the peripheral portion and the transition structure, the sealing performance of the matching position between the pole body and the transition structure can be further improved, thereby improving the sealing effect of the battery cell.

[0066] In some embodiments, the transition structure has a second annular groove that matches the sealing structure, and the sealing structure is embedded in the second annular groove.

[0067] In the above technical solution, the second annular groove is provided to position the sealing structure, thereby improving the assembly efficiency and installation reliability of the sealing structure.

[0068] In some embodiments, the transition structure includes a mating ring portion, the pole body includes a penetration portion passing through the mating ring portion, and a first limiting portion and a second limiting portion connected to the penetration portion and clamped on both sides of the mating ring portion, and the insulating sealing structure includes a sealing structure member, which extends along the circumference of the mating ring portion and is clamped between the mating ring portion and the pole body.

[0069] In the above technical solution, the pole component has a simple structure and is easy to manufacture, enabling simple and effective relative fixation and insulation between the pole body and the adapter structure. Furthermore, the sealing structure is clamped by the mating position between the pole body and the mating ring, allowing the sealing structure to be positioned within the mating position between the adapter structure and the pole body. This facilitates sealing the mating position between the adapter structure and the pole body in a shorter path, improving sealing reliability. Furthermore, the size of the sealing structure is reduced, the sealing area is reduced, and compression sealing is facilitated, making the seal less likely to fail and improving the sealing effect.

[0070] In some embodiments, at least a portion of the sealing structure is disposed on a side of the matching ring portion close to or away from the electrode component, so as to be clamped between the matching ring portion and at least one of the first limiting portion and the second limiting portion.

[0071] In the above technical solution, a relatively reliable sealing effect can be achieved between the transition structure and the pole body through axial sealing. If the pole component only includes the pole body, and an axial seal is provided between the pole body and the first shell wall, it is necessary to apply sealing pressure along the axial direction of the mounting hole, which will cause excessive force on the first shell wall. However, the embodiment of the present application can reduce the axial force on the first shell wall by integrating the axial seal into the pole component. In addition, when at least part of the sealing structure is provided on the side of the mating ring portion close to the electrode component, sealing can be performed from the side of the mating ring portion close to the accommodating cavity, which can more effectively inhibit the leakage of electrolyte from the mating position of the pole body and the transition structure, thereby improving the sealing effect.

[0072] In some embodiments, the insulating sealing structure also includes a second insulating member, a sealing structure member is clamped between one of the first limiting portion and the second limiting portion and the mating ring portion, and a second insulating member is clamped between the other of the first limiting portion and the second limiting portion and the mating ring portion.

[0073] In the above technical solution, because the insulating sealing structure includes a second insulating member and a sealing structure that are not integrated into a single piece, the design and processing of the insulating sealing structure can be simplified. Furthermore, depending on the specific requirements for coordination with the pole body and the transition structure, the second insulating member can be configured as a substantially incompressible insulating member without a sealing effect, or as a compressible sealing member with a sealing effect, thereby meeting different practical requirements.

[0074] In some embodiments, the sealing structure is an integral structure and is surrounded by a mating ring portion, which is located on the side of the mating ring portion close to the electrode component and the side away from the electrode component respectively. The pole body is clamped on both sides of the mating ring portion along the inner and outer directions by the sealing structure.

[0075] In the above technical solution, since the sealing structure is an integrated structure and is surrounded by a matching ring portion, the number of parts and the number of assembly steps can be reduced.

[0076] In some embodiments, at least a portion of the sealing structure is clamped between the first limiting portion and the matching ring portion, and the second limiting portion and the penetration portion are assembled and connected on a side of the matching ring portion facing away from the first limiting portion.

[0077] In the above technical solution, the second limiting portion and the penetration portion are provided as separate components and assembled and connected. This simplifies the structure of the pole body and facilitates assembly and connection with the adapter structure. Furthermore, when the second limiting portion and the mating ring portion sandwich the second insulating member, and the second limiting portion and the penetration portion are welded, the thermal impact on the sealing structure sandwiched between the first limiting portion and the mating ring portion is reduced, thereby improving the sealing reliability of the sealing structure.

[0078] In some embodiments, at least a portion of the sealing structure is clamped between the first limiting portion and the matching ring portion, the second limiting portion and the penetration portion are integrated, and the second limiting portion rivets the insulating sealing structure against the matching ring portion.

[0079] In the above technical solution, the second stopper is riveted to the insulating sealing structure, reducing the thermal impact of heat generated during the connection between the second stopper and the insulating sealing structure on the sealing structure clamped between the first stopper and the mating ring, thereby improving the sealing reliability of the sealing structure. Furthermore, when the second insulating member is clamped between the second stopper and the mating ring, riveting the second stopper facilitates controlling the compression of the sealing structure, achieving a better compression effect.

[0080] In some embodiments, the pole body includes a first pole piece and a second pole piece, the second pole piece includes a penetration portion, a first limiting portion and a second limiting portion, the penetration portion surrounds a matching hole, the first pole piece is installed on the side of the second pole piece away from the electrode component and covers the matching hole, and the electrode component is connected to the first pole piece through a conductive portion extending into the matching hole.

[0081] In the above technical solution, by dividing the terminal body into two parts for assembly and connection, when assembling the battery cell, the first terminal member can be connected to the electrode component and the second terminal member can be connected to the first shell wall first, and then the first and second terminal members can be connected. This helps shorten the conductive part, reducing redundancy and material costs. In addition, the mating hole can serve to accommodate the conductive part, reducing the conductive part's occupation of the accommodating cavity.

[0082] In some embodiments, the first limiting portion is clamped on a side of the matching ring portion close to the electrode component, and the sealing structure includes a fifth portion clamped between the matching ring portion and the first limiting portion.

[0083] In the above technical solution, sealing can be performed from the side of the mating ring portion close to the interior of the shell component, which can more effectively prevent the electrolyte from leaking from the mating position of the pole body and the transition structure, thereby improving the sealing effect.

[0084] In some embodiments, the sealing structure also includes a sixth part, which is connected to an end of the fifth part close to the pole body and extends in a direction away from the electrode component relative to the fifth part to be spaced between the outer peripheral surface of the penetration part and the inner peripheral surface of the mating ring part.

[0085] In the above technical solution, by configuring the sealing structure to further include a sixth portion spaced between the outer circumferential surface of the penetration portion and the inner circumferential surface of the mating ring portion, insulation of this position can be achieved simply and effectively.

[0086] In some embodiments, the adapter structure includes a fourth adapter ring, which includes a main body ring portion and a mating ring portion. The main body ring portion is arranged around the mating ring portion, and the mating ring portion is raised relative to the main body ring portion in a direction away from the electrode component to form a third annular groove on the side of the mating ring portion close to the electrode component, and the sealing structure is matched with the third annular groove.

[0087] In the above technical solution, because the main ring portion of the fourth adapter ring protrudes toward the electrode component relative to the mating ring portion, this helps reduce the space occupied by the electrode body within the housing component. Furthermore, the bending of the fourth adapter ring forms a third annular groove, allowing at least a portion of the sealing structure to be submerged within the third annular groove. For example, the thickness of the submerged portion can be equal to, or slightly larger or smaller than, the depth of the third annular groove. Thus, the provision of the third annular groove serves to position the sealing structure, thereby improving assembly efficiency and installation reliability of the sealing structure.

[0088] In some embodiments, the sealing structure also includes a seventh part, which is connected to the end of the fifth part that is away from the pole body, and extends relative to the fifth part in a direction close to the electrode component, so as to be sealed between the outer peripheral surface of the first limiting portion and the inner peripheral surface of the main body ring portion.

[0089] In the above technical solution, by setting the sealing structure to also include a seventh part that seals between the first limiting portion and the main body ring portion, the sealing performance of the matching position between the pole body and the transition structure can be further improved, thereby improving the sealing effect of the battery cell.

[0090] In some embodiments, the adapter structure further includes a fourth adapter ring, which is a metal ring and includes a matching ring portion, and the fourth adapter ring is welded to the first shell wall.

[0091] In the above technical solution, the transition structure has good structural strength and is suitable for connection with the first shell wall made of metal material.

[0092] In some embodiments, the adapter structure further includes a third insulating frame connected to a side of the fourth adapter ring close to the electrode component.

[0093] In the above technical solution, the third insulating frame can be used to insulate between the electrode component and the fourth adapter ring, eliminating the need to provide an insulating sealing structure.

[0094] In some embodiments, the transition structure is formed into a long strip extending along the length direction of the first shell wall, and the contour shape of the pole body matches the contour shape of the transition structure.

[0095] In the above technical solution, when the contour of the pole body is formed into a long strip that matches the contour of the adapter structure, the area of ​​the pole body is larger, which is conducive to increasing the connection area between the conductive part and the pole body, thereby improving the charging performance.

[0096] In some embodiments, the transition structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is disposed in the center of the transition structure and has a circular outline.

[0097] In the above technical solution, the connection position between the transition structure and the pole body is evenly stressed, and the compression of the insulating sealing structure is easily controlled to improve the reliability of the sealing fit between the two. In addition, the sealing area is relatively small and not prone to failure.

[0098] In some embodiments, the position of the inner end surface of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, and the surrounding area is flush with the inner end surface of the pole body.

[0099] In the above 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 flat on the inner end surface of the pole body, and the remaining part can be laid flat on the surrounding area, so that the pole connecting portion of the conductive part can be supported as a whole, which is convenient for tightening the welding nozzle and enables the conductive part to be reliably connected to the pole body.

[0100] In some embodiments, the position of the inner end surface of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, and the inner end surface of the pole body protrudes from the surrounding area toward the direction approaching the electrode component.

[0101] In the above technical solution, by setting the inner end face of the pole body to protrude from the surrounding area in the direction close to the electrode component, when the height of the pole body is constant, it is equivalent to retracting the pole body in the direction of the accommodating cavity, so as to reduce the space occupied by the pole component outside the shell component and reduce the size of the battery cell in the direction of setting the pole component.

[0102] In some embodiments, the position of the inner end face of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, and the inner end face of the pole body protrudes from the surrounding area in a direction close to the electrode component; the electrode component is connected to the pole component through a conductive portion, the conductive portion includes a pole ear portion and a conductive member connected to the pole ear portion, the conductive member includes a first conductive segment laid on the inner end face of the pole body, and a second conductive segment staggered from the inner end face of the pole body, the second conductive segment protrudes relative to the first conductive segment in a direction away from the electrode component, and the pole ear portion is connected to the second conductive segment.

[0103] In the above technical solution, the height difference between the pole body and the transition structure can be used to accommodate the second conductive segment and the pole ear of the conductive member, thereby fully utilizing the space, reducing the space occupied by the conductive part in the accommodating cavity, and improving the energy density of the battery cell.

[0104] In some embodiments, the pole component is surrounded by a receiving groove that is recessed relative to the first shell wall in a direction away from the electrode component and open in a direction toward the electrode component. The electrode component is connected to the pole component through a conductive portion, and at least a portion of the conductive portion is received in the receiving groove and connected to the pole body.

[0105] In the above technical solution, by providing a receiving groove to accommodate the conductive part, the space occupied by the conductive part in the receiving cavity can be reduced, leaving more room in the receiving cavity to accommodate the active material coating part, which helps to increase the volume of the active material coating part and thus increase the energy density of the battery cell. Moreover, because the receiving groove is open toward the electrode component, the conductive part can be easily inserted into the receiving groove, reducing the difficulty of operation.

[0106] In some embodiments, the accommodating groove is formed on the side of the pole body and the transition structure close to the electrode component, and the transition structure bulges relative to the first shell wall in the direction away from the electrode component, so that the accommodating groove is recessed relative to the first shell wall in the direction away from the electrode component.

[0107] In the above technical solution, by processing the adapter structure into a protruding bulge outward, a part of the accommodating groove is formed on the side of the pole body facing the electrode component, and another part of the accommodating groove is formed on the side of the adapter structure facing the electrode component, and the accommodating groove is in a shape that is concave relative to the first shell wall in the direction away from the electrode component, so that the side of the pole body facing the electrode component and the side of the adapter structure facing the electrode component both have a space accommodating groove conductive part. In this way, it is not only convenient to accommodate the conductive part to a greater extent, but also conducive to the design of diverse forms of the conductive part.

[0108] In some embodiments, the surface of one end of the pole body facing the electrode component is the inner end surface of the pole body, the inner end surface of the pole body participates in forming the accommodating groove, and the conductive portion is connected to the inner end surface of the pole body.

[0109] In the above technical solution, at least part of the accommodating groove is surrounded by the surface of the pole body facing the electrode component. The conductive part received in the accommodating groove can be easily contacted and connected to the pole body, thereby improving the connection convenience and simplifying the structure.

[0110] In some embodiments, the transition structure includes a connection end connected to the first shell wall, the transition structure includes a raised portion protruding relative to the connection end in a direction away from the pole component, and the pole body is mounted on the raised portion.

[0111] In the above technical solution, by installing the pole body on the raised portion, the occupancy of the accommodation cavity by the pole body can be reduced, thereby improving the energy density of the battery cell.

[0112] In some embodiments, a receiving groove is formed on the raised portion and the side of the transition structure close to the electrode component. The electrode component is connected to the pole component through the conductive portion. At least part of the conductive portion is received in the receiving groove and connected to the pole body.

[0113] In the above technical solution, a accommodating groove is formed on the bulge portion and the side of the transition structure close to the electrode component to accommodate the conductive part by arranging the bulge portion, thereby reducing the space occupied by the conductive part in the accommodating cavity, so that the accommodating cavity has a larger space to accommodate the active material coating part, which is beneficial to increase the volume of the active material coating part, thereby increasing the energy density of the battery cell.

[0114] In some embodiments, the transition structure includes a connection end connected to the first shell wall, the transition structure includes a sunken portion recessed relative to the connection end toward the pole component, and the pole body is mounted on the sunken portion.

[0115] In the above technical solution, when the height of the pole body is constant, it is equivalent to retracting the pole body in the direction of the accommodating cavity, which is beneficial to reducing the space occupied by the pole body outside the shell component and reducing the size of the battery cell in the direction of setting the pole component.

[0116] In some embodiments, the side surface of the sunken portion close to the electrode component is a surrounding area surrounding the pole body, and the inner end surface of the pole body protrudes from the surrounding area toward the direction close to the electrode component, or the surrounding area is flush with the inner end surface of the pole body.

[0117] The above technical solution allows for flexible processing to meet various requirements. For example, when the inner end surface of the pole body protrudes beyond the surrounding area toward the electrode component, the space occupied by the pole component outside the housing can be reduced. For example, when the surrounding area is flush with the inner end surface of the pole body, this facilitates connection with the conductive portion, freeing the shape and size of the pole body.

[0118] In some embodiments, a mounting hole is formed on the first shell wall, the pole component is arranged at the mounting hole, and the transition structure includes a connecting end connected to the first shell wall, and one of the connecting end and the first shell wall has a fourth annular groove that is embedded with the other, and the fourth annular groove extends along the entire circumference of the mounting hole and is open in a direction away from the electrode component.

[0119] In the above technical solution, the provision of the fourth annular groove serves as an assembly positioning function, facilitating the assembly and connection of the pole component to the first housing wall. Furthermore, because the fourth annular groove is open toward the outside, the adapter structure and the first housing wall can be welded from the outside of the first housing wall, which facilitates the connection convenience and reliability of the pole component and the first housing wall.

[0120] In some embodiments, the shell component has a accommodating cavity, and the shell component includes a shell body that participates in forming the accommodating cavity, the shell body is semi-closed cylindrical and has an opening at one end, and the end of the shell body opposite to the opening serves as a first shell wall, or the shell component includes a shell cover that participates in forming the accommodating cavity, the shell cover is flat and serves as the first shell wall.

[0121] In the above technical solution, the structural design of the shell component is flexible, and the location of the terminal component can be flexible. Furthermore, when the end of the shell body opposite the opening is a first shell wall, since the electrode component housed in the shell component is connected to the terminal component mounted on the first shell wall, when the battery vibrates or deforms, the terminal components connected by the current collector will be pulled against each other. Since the terminal component is disposed on the end wall of the shell body opposite the opening, the force acting on the terminal component is preferentially transmitted to the shell body, rather than directly acting on the shell cover. This not only extends the distance for the force to be transmitted to the weld between the shell body and the shell cover, but also causes the shell body to deform preferentially when subjected to force, thereby reducing the force applied to the weld between the shell body and the shell cover. This effectively reduces the probability of cracking at the weld between the shell body and the shell cover during battery use, thereby improving the reliability of the battery cell. Furthermore, since the connection between the shell body and the shell cover is less prone to cracking, there is no need to increase the wall thickness of the shell body and the shell cover to increase the reliability of the connection between the two, thereby reducing weight and material costs, and facilitating the miniaturization of the battery cell or increasing the energy density of the battery cell.

[0122] In some embodiments, the electrode component includes an active material coating portion housed in the housing component, and a pole ear portion connected to the active material coating portion, wherein the pole ear portion extends to and is connected to the pole body.

[0123] In the above technical solution, the use of the conductive member can be omitted, and the connection process between the conductive member and the pole ear portion can be omitted.

[0124] In some embodiments, the side surface of the pole body close to the electrode component is the inner end surface of the pole body, and the pole ear portion includes a gathered portion formed by stacking and connecting multiple layers of pole ear sheets, and at least part of the gathered portion is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body.

[0125] In the above technical solution, by laying at least part of the gathered portion on the inner end surface of the pole body and connecting to the inner end surface of the pole body, it is beneficial to increase the connection area, connection reliability and current carrying capacity between the pole ear and the pole body.

[0126] In some embodiments, the electrode component includes an active material coating portion housed in the electrode body, and a pole ear portion connected to the active material coating portion, and the pole ear portion is connected to the electrode body through a conductive member.

[0127] In the above technical solution, the pole ear and the pole body are indirectly connected through a conductive part, which can shorten the length of the pole ear and improve the problems of wrinkling, bending and breaking of the pole ear. In addition, the shape and material of the conductive part can be flexibly designed to reduce the difficulty of connecting the conductive part and the pole body and improve the convenience of connecting the conductive part and the pole body.

[0128] In some embodiments, the conductive member includes a first connecting section, the first connecting section includes two clamping portions, the tab portion includes a tab end portion, and the tab end portion is clamped between the two clamping portions and connected to the clamping portions.

[0129] In the above technical solution, the two clamping portions can be used to limit the tab end, thereby improving the connection reliability of the multiple tab sheets in the tab end. In addition, in some examples, by providing two clamping portions, the tab end clamped between the two clamping portions can be in the state of a laminated portion, which can eliminate the step of connecting the multiple tab sheets in the laminated portion to form a gathered portion, thereby simplifying the processing process and improving processing efficiency.

[0130] In some embodiments, the surface of one end of the pole body close to the electrode component is the inner end surface of the pole body, the conductive member includes a second connecting segment, the second connecting segment is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body, the conductive member is bent at the connection position between the first connecting segment and the second connecting segment, so that the first connecting segment is located on the side of the second connecting segment away from the pole body, and one of the clamping portions is supported on the side of the end of the pole ear away from the pole body.

[0131] In the above technical solution, the clamping portion supports the tab, improving tab redundancy and reducing the risk of short circuits caused by the tab being inserted upside down into the active material coating. Furthermore, the bent conductive member acts as a buffer, reducing the risk of the electrode component impacting the first shell wall and improving the reliability of the battery cell.

[0132] In some embodiments, the tab portion includes a gathered portion formed by stacking and connecting multiple tab sheets, the conductive member includes a first connecting segment, and the gathered portion is stacked on one side of the first connecting segment in a thickness direction and connected to the first connecting segment.

[0133] In the above technical solution, the first connecting section is in the form of a plate, and the thickness direction of the first connecting section is consistent with that of the gathering portion. The two are stacked along the thickness direction of the first connecting section, so that the matching method between the gathering portion and the conductive part is simple, which is conducive to improving production efficiency.

[0134] In some embodiments, the surface of one end of the pole body close to the electrode component is the inner end surface of the pole body, and the first connecting section is supported on the side of the retracted portion facing away from the pole body, so that the retracted portion is clamped between the inner end surface of the pole body and the first connecting section.

[0135] In the above technical solution, the first connecting section supports the gathered portion, thereby improving the redundancy of the pole ear portion and reducing the risk of short circuit caused by the pole ear portion being invertedly inserted into the active material coating portion.

[0136] In some embodiments, the electrode component includes an active material coating portion housed in a shell component, the active material coating portion is connected to the pole body through a conductive portion, and the conductive portion is bent to form at least two open grooves, wherein the opening directions of the two open grooves are different and are adjacent in the direction from the pole body to the active material coating portion.

[0137] In the above technical solution, the conductive portion can have a reciprocating, serpentine shape, acting as a buffer. When the battery cell is used in a vibrating environment, it can reduce the impact of the active material coating portion on the first shell wall, thereby protecting the electrode components and improving the reliability of the battery cell. Moreover, because the conductive portion does not extend randomly, it can reduce the risk of interference and scratching between the tabs in the conductive portion, as well as the risk of the tab being inserted upside down near the active material coating portion, further improving the reliability of the battery cell.

[0138] In some embodiments, the electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion is connected to the pole body through the pole ear portion, and the pole ear portion is bent alone to form two open slots with openings facing opposite and adjacent directions; or, the electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion includes the pole ear portion and a conductive member connected to the pole ear portion, the pole ear portion is connected to the pole body through the conductive member, and the conductive member and the pole ear portion are bent together to form two open slots with openings facing opposite and adjacent directions.

[0139] In the above technical solution, the conductive portion can be in an S-shape that bends back and forth, thereby shortening the length of the conductive portion, simplifying the structure of the conductive portion, and facilitating the processing of the conductive portion.

[0140] In some embodiments, the battery cell further includes a pressure relief device, which is provided on the housing component and is located on the same side or on the opposite side as the pole component.

[0141] In the above technical solution, when the pressure relief device and the terminal component are located on the same side, the design of the housing walls other than the first wall can be simplified, simplifying the structure and processing of the battery cell. When the pressure relief device and the terminal component are located on different sides, there is no need to consider the space occupied by the pressure relief device in the first wall, which reduces the volume of the terminal component and allows for flexible design of the shape and volume of the terminal component as needed.

[0142] In a second aspect, an embodiment of the present application further provides a battery comprising a battery cell according to any of the above solutions.

[0143] In the above technical solution, since the reliability of the battery cell according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery.

[0144] In some embodiments, the battery includes a box body, a plurality of battery cells are housed in the box body, the bottom of the box body is the box body bottom plate, and the electrode component is arranged on the side of the shell component close to the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

[0145] In the above technical solution, when the pole component of the battery cell is arranged on the side of the shell component facing the bottom plate of the box body, the battery cell is in an inverted state, and the decompression product is sprayed in the direction away from the passenger compartment, which is safer; when the pole component of the battery cell is arranged on the side of the shell component close to the bottom plate of the box body, the battery cell is in an upright state, and the electrolyte is not easy to leak; therefore, the orientation of the battery cell and the box body can be flexibly set.

[0146] In a third aspect, an embodiment of the present application further provides an electrical device comprising a battery according to any of the above solutions.

[0147] In the above technical solution, since the performance of the battery is improved, it is beneficial to improve the working power performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0148] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0149] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0150] Figure 2 An exploded view of a battery provided in accordance with some embodiments of the present application;

[0151] Figure 3 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0152] Figure 4 A cross-sectional view of a battery cell provided in some embodiments of the present application;

[0153] Figure 5 for Figure 4 A partial enlarged view of

[0154] Figure 6 A top view of a battery cell provided in some embodiments of the present application;

[0155] Figure 7 For the Figure 6 Cross-sectional view along line AA;

[0156] Figure 8 A schematic structural diagram of a pole component provided in some embodiments of the present application;

[0157] Figure 9 An exploded view of a battery cell provided in some embodiments of the present application;

[0158] Figure 10 for Figure 9 A cross-sectional view of the pole component shown in FIG;

[0159] Figure 11 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0160] Figure 12 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0161] Figure 13 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0162] Figure 14A cross-sectional view of a pole component provided in some embodiments of the present application;

[0163] Figure 15 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0164] Figure 16 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0165] Figure 17 An exploded view of the pre-processing process of the third adapter ring provided in some embodiments of the present application;

[0166] Figure 18 An exploded view of the processing process of a pole component provided in some embodiments of the present application;

[0167] Figure 19 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0168] Figure 20 for Figure 19 A schematic diagram of the pole components shown in ;

[0169] Figure 21 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0170] Figure 22 An exploded view of a pole component provided in some embodiments of the present application;

[0171] Figure 23 for Figure 22 The assembly drawing of the pole parts shown in ;

[0172] Figure 24 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0173] Figure 25 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0174] Figure 26 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0175] Figure 27 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0176] Figure 28 for Figure 27 Cross-sectional view along line BB;

[0177] Figure 29 A cross-sectional view of a pole component provided in some embodiments of the present application;

[0178] Figure 30A partial cross-sectional view of a battery cell provided in some embodiments of the present application, in which the terminal component is in a state before being covered by the first shell wall;

[0179] Figure 31 for Figure 30 FIG . shows a state in which the pole component is covered behind the first shell wall;

[0180] Figure 32 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, in which the terminal component is in a state before being covered by the first shell wall;

[0181] Figure 33 for Figure 32 FIG . shows a state in which the pole component is covered behind the first shell wall;

[0182] Figure 34 An exploded view of a first shell wall and a pole component provided in some embodiments of the present application;

[0183] Figures 35A-35D An exploded view of the processing of a battery cell according to an embodiment of the present application;

[0184] Figures 36A-36C An exploded view of the processing of a battery cell according to an embodiment of the present application;

[0185] Figure 37 A cross-sectional view of a battery cell provided in some embodiments of the present application;

[0186] Figures 38A-38F An exploded view of the processing of a battery cell according to an embodiment of the present application;

[0187] Figures 39A-39D An exploded view of the processing of a battery cell according to an embodiment of the present application;

[0188] Figures 40A-40D An exploded view of the processing of a battery cell according to an embodiment of the present application;

[0189] Figures 41A-41D An exploded view of the processing of a battery cell provided in one embodiment of the present application.

[0190] Reference numerals:

[0191] Vehicles 1000;

[0192] Battery 100; Controller 200; Motor 300;

[0193] Box body 101; first box portion 1011; second box portion 1012; box body bottom plate 1013;

[0194] Battery cell 102; first direction F1; second direction F2; third direction F3;

[0195] fourth direction F4; fifth direction F5;

[0196] Housing component 1; housing body 11; first housing wall 111;

[0197] Shell wall inner end surface 1110; overlap portion 1112;

[0198] Mounting hole 112; opening 113; second shell wall 114;

[0199] Shell cover 12; bracket 121; accommodating chamber 13;

[0200] Pole component 2;

[0201] pole body 21;

[0202] The inner end surface 211 of the pole body;

[0203] Peripheral portion 212; main body portion 213;

[0204] First pole piece 21a; second pole piece 21b;

[0205] Penetrating portion 214; riveting portion 2141; fitting hole 21b1;

[0206] First limiting portion 215; second limiting portion 216;

[0207] Adapter structure 22; inner ring portion 2211 of the adapter structure; outer ring portion 2212 of the adapter structure;

[0208] Connecting end 22a; fourth annular groove C1;

[0209] Raised portion 22b; sunken portion 22c;

[0210] The inner end surface 220 of the transition structure; the surrounding area 2201;

[0211] First adapter ring 221; first annular groove 2213;

[0212] Second adapter ring 222; stop ring portion 2221;

[0213] A third adapter ring 223; a first extension portion 2231; and a second extension portion 2232;

[0214] Preformed portion 223a; fixed end 223a1 of the preformed portion;

[0215] Outer ring portion 223a2; inner ring portion 223a3; bent portion 223a4;

[0216] Riveted forming portion 223b; fixed end 223b1 of the riveted forming portion;

[0217] First insulating frame 224; second insulating frame 225; second annular groove 226;

[0218] Fourth adapter ring 227;

[0219] Matching ring portion 2271; main body ring portion 2272; third annular groove 2273;

[0220] a third insulating frame 228;

[0221] Insulation sealing structure 23;

[0222] Sealing structure 231; shaft side portion 231a; peripheral side portion 231b;

[0223] First part 2311; second part 2312; third part 2313;

[0224] Part 5 2315; Part 6 2316; Part 7 2317;

[0225] First insulating member 232; second insulating member 234; flange portion 241;

[0226] Electrode component 3; electrode assembly 31; electrode tab 311;

[0227] Lamination portion 312; Gathering portion 313;

[0228] active material coating portion 32;

[0229] Pole ear portion 33; Pole ear end portion 331;

[0230] Conductive portion 4; conductive member 41; first connecting section 411; clamping portion 4110;

[0231] Second connecting segment 412; first conductive segment 415; second conductive segment 416;

[0232] Open slot 42;

[0233] Accommodating groove 5; first groove 511; second groove 512; third groove 513;

[0234] Pressure relief device 6; insulating film 7. DETAILED DESCRIPTION

[0235] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0236] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0237] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0238] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood broadly. For example, they can refer to direct connection or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0239] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0240] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0241] The term "plurality" used in this application refers to more than two, including two.

[0242] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, or solid-state batteries, etc., and the embodiments of this application are not limited to this. Battery cells may be cylindrical, rectangular, or in other shapes, etc., and the embodiments of this application are not limited to this.

[0243] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery may include a casing for enclosing one or more battery cells, or one or more battery modules, to prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0244] A battery cell consists of a housing, an electrode assembly, and an electrolyte (in a solid-state battery, this can be a solid electrolyte layer located between the positive and negative electrodes). The electrode assembly includes at least one electrode assembly, both housed in the housing. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator (this structure can be omitted in solid-state batteries). A battery cell primarily operates by the movement of metal ions between the positive and negative electrodes.

[0245] The positive electrode sheet consists of a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer. The positive electrode current collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide.

[0246] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon, etc. The separator can be made of PP, polypropylene, PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of the present application has a wound or laminated structure.

[0247] In the related art, when the pole is installed on the shell, the connection between the pole and the shell must be both insulated and sealed. In order to ensure the sealing of the connection, a sealing ring needs to be provided between the shell and the pole. In order to ensure the sealing of the sealing ring, it is necessary to apply a large pressure to the pole to press the sealing ring together with the shell so that the compression of the sealing ring meets the sealing requirements. However, applying too much force to the pole component can easily cause the shell to deform due to excessive force. In order to improve this problem, it is usually necessary to increase the wall thickness of the shell, which will increase the material cost and increase the weight of the battery cell.

[0248] In view of this, the pole component provided in the embodiment of the present application, on the one hand, in addition to including a pole body connected to the electrode component, also includes a transition structure connected to the shell wall, and an insulating sealing structure is provided between the transition structure and the pole body, which plays an insulating and sealing role at the connection between the pole body and the transition structure, so that the pole component itself has self-sealing properties, which can facilitate the installation and coordination of the pole component and the shell component, and can save installation time and cost; on the other hand, in the conventional structure, the pole body needs to be pressed on the sealing member placed on the first shell wall to achieve the sealing of the shell component, but this sealing method, in order to ensure In order to ensure the pre-tightening force required for sealing, the pressure applied by the pole component to the first shell wall is relatively large. When the shell thickness is relatively thin, it is easy to cause deformation or damage to the first shell wall. Therefore, through such an arrangement, when installing the pole component to the shell wall, there is no need to consider the insulation and sealing issues between the transition structure and the shell wall. It is only necessary to complete a reliable connection throughout the whole circle. Therefore, there is no need to apply a large force to the pole component in order to meet the sealing requirements of the connection between the transition structure and the shell wall, thereby improving the problem of deformation of the shell wall due to force, which is conducive to reducing the wall thickness of the shell, reducing material costs, reducing the weight of the battery cell, and improving energy density.

[0249] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries containing battery cells, and electrical devices using batteries.

[0250] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0251] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0252] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery 100. The battery 100 can be located at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as the operating power source of the vehicle 1000.

[0253] The vehicle 1000 may further include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0254] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0255] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of the present application, wherein the battery 100 includes a battery cell 102 and a housing 101 for accommodating the battery cell 102. The housing 101 may have various structural forms.

[0256] In some embodiments, the box body 101 may include a first box portion 1011 and a second box portion 1012, the first box portion 1011 and the second box portion 1012 cover each other, and the first box portion 1011 and the second box portion 1012 together define a storage space for accommodating the battery cell 102. A seal may also be provided at the connection position between the first box portion 1011 and the second box portion 1012 to achieve a sealed connection between the first box portion 1011 and the second box portion 1012. For example, referring to Figure 2 The first box portion 1011 and the second box portion 1012 can both be hollow structures with one side open, with the open side of the first box portion 1011 covering the open side of the second box portion 1012, thereby forming the box body 101 with a storage space. For another example, the second box portion 1012 can be a hollow structure with one side open, with the first box portion 1011 in the form of a cover that can cover the open side of the second box portion 1012. The box body 101 can have various shapes, such as a cylindrical box body, a rectangular box body, etc.

[0257] In the battery 100, there can be one or more battery cells 102. If there are multiple battery cells 102, the multiple battery cells 102 can be connected in series, in parallel, or in a mixed connection. Mixed connection means that the multiple battery cells 102 are connected both 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 formed by the multiple battery cells 102 is accommodated in the housing 101. Of course, it is also possible that the multiple battery cells 102 are first connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the housing 101. In some embodiments, the multiple battery cells 102 can be electrically connected through a busbar to achieve parallel, series, or mixed connection of the multiple battery cells 102.

[0258] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell 102 provided in some embodiments of the present application. The battery cell 102 is in the form of a rectangular parallelepiped, with the height direction of the battery cell 102 being a first direction F1, the thickness direction of the battery cell 102 being a second direction F2, and the width direction of the battery cell 102 being a third direction F3. The first direction F1, the second direction F2, and the third direction F3 are mutually perpendicular.

[0259] Please refer to Figure 4-Figure 7 , Figure 4 A cross-sectional view of a battery cell 102 provided in some embodiments of the present application is provided. Figure 5 for Figure 4 A partial enlarged view of Figure 6 A top view of a battery cell 102 provided in some embodiments of the present application is provided. Figure 7 For the Figure 6 Sectional view along line AA.

[0260] Combine Figure 4 The battery cell 102 may include a housing component 1 , a terminal component 2 and an electrode component 3 .

[0261] Combine Figure 4 and Figure 5, the pole component 2 is installed on the shell component 1. Exemplarily, the shell component 1 has an accommodating cavity 13, and the shell component 1 includes a first shell wall 111. The first shell wall 111 participates in forming the accommodating cavity 13. The first shell wall 111 has a mounting hole 112. The pole component 2 is installed on the first shell wall 111 and is provided at the mounting hole 112. Among them, "the pole component 2 is installed on the first shell wall 111" means that there is an assembly connection relationship between the pole component 2 and the first shell wall 111, such as welding or riveting. Therefore, the shell component 1 and the pole component 2 are separate components, and the two are assembled and connected, so that the shell component 1 can be processed separately, and the pole component 2 can be processed separately, thereby facilitating the processing of the two and facilitating the processing and manufacturing of the battery cell 102.

[0262] Combine Figure 4 and Figure 5 The electrode component 3 is housed in the housing component 1. Exemplarily, the electrode component 3 includes an active material coating portion 32 and a tab portion 33. The active material coating portion 32 is housed in the accommodating cavity 13, and the tab portion 33 is connected to the active material coating portion 32. The electrode component 3 includes one or more electrode assemblies 31. The portion of the current collector in the electrode assembly 31 coated with the active material layer constitutes the active material coating portion 32, and the portion not coated with the active material layer constitutes the tab portion 33. The tab portion 33 includes a multilayer tab sheet 311.

[0263] The pole component 2 and the first housing wall 111 are located on the same side of the electrode component 3, that is, the pole component 2 is provided on the side of the first housing wall 111, so that the pole component 2 can be installed in the installation hole 112 of the first housing wall 111. For example, when the first housing wall 111 is located above the electrode component 3, the pole component 2 is also located above the electrode component 3; when the first housing wall 111 is located below the electrode component 3, the pole component 2 is also located below the electrode component 3; when the first housing wall 111 is located on the side of the electrode component 3, the pole component 2 is also located on the same side of the electrode component 3.

[0264] For example, the housing component 1 can be surrounded by multiple walls with different orientations, one of which is the first housing wall 111. A plane perpendicular to the direction through which the mounting hole 112 passes is used as a projection plane. The orthographic projection of the mounting hole 112 on this projection plane completely falls within the range of the orthographic projection of the first housing wall 111 on this projection plane, and the orthographic projection area of ​​the mounting hole 112 is smaller than the orthographic projection area of ​​the first housing wall 111. One or more mounting holes 112 can be provided on the first housing wall 111 to meet the installation requirements of one or more pole components 2.

[0265] Combine Figure 5 and Figure 7, the electrode component 3 is connected to the pole component 2. The electrode component 3 is connected to the pole component 2 via the conductive portion 4. The pole component 2 includes a pole body 21, and the active material coating portion 32 is connected to the pole body 21 via the conductive portion 4 to form electrical conduction. Exemplarily, the battery 100 includes a busbar component located outside the battery cell 102, and the pole body 21 is connected to the busbar component to form electrical conduction, so that multiple battery cells 102 can be connected via the busbar component.

[0266] Exemplarily, when the pole component 2 is a negative pole, the pole body 21 can be a copper-aluminum composite part, wherein the copper-aluminum composite part can include an aluminum part and a copper part, the aluminum part is arranged on the side of the copper part away from the active material coating part 32, and is easy to form a reliable connection with the aluminum bus component, and the copper part is easy to connect with the copper foil electrode tab of the negative pole; and when the pole component 2 is a positive pole, the pole body 21 can be an aluminum part, and the aluminum part can easily form a reliable connection with the aluminum bus component, and the aluminum part can also easily connect with the aluminum foil electrode tab of the positive pole.

[0267] The connection method between the conductive portion 4 and the pole component 2 is not limited, and may include, but is not limited to, ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure fusion welding, brazing, gluing, etc.

[0268] For example, reference Figure 5 The conductive portion 4 may include a pole ear portion 33 and a conductive member 41 connected to the pole ear portion 33. The pole ear portion 33 is indirectly connected to the pole body 21 through the conductive member 41. The conductive member 41 may be part of the electrode component 3, or may be part of the pole component 2, or may be independent of the electrode component 3 and the pole component 2.

[0269] Therefore, by indirectly connecting the pole ear portion 33 and the pole body 21 through the conductive member 41, the length of the pole ear portion 33 can be shortened, and problems such as wrinkling, bending and breaking of the pole ear piece 311 can be improved. In addition, by flexibly designing the shape and material of the conductive member 41, the difficulty of connection with the pole body 21 can be reduced, and the convenience of connection between the conductive member 41 and the pole body 21 can be improved.

[0270] For example, reference Figure 7 The conductive portion 4 includes a pole ear portion 33 and is connected to the pole body 21 through the pole ear portion 33. That is, the conductive member 41 is not required, and the pole ear portion 33 can be directly connected to the pole body 21. As a result, the use of the conductive member 41 can be omitted, and the connection process of the conductive member 41 and the pole ear portion 33 can be omitted.

[0271] An insulating material member is provided between the pole body 21 and the first shell wall 111 to achieve insulation between the first shell wall 111 and the pole body 21, thereby preventing the first shell wall 111 from being charged. For example, the insulating material member can be a part of the pole component 2 (such as the insulating sealing structure 23) and is insulated from the pole body 21.

[0272] The structure of the shell component 1 is not limited. For example, the shell component 1 includes a shell body 11 that forms a receiving cavity 13, one end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111. For example, Figures 8-10 , Figure 8 A schematic structural diagram of a pole component provided in some embodiments of the present application; Figure 9 An exploded view of a battery cell provided in some embodiments of the present application; Figure 10 for Figure 9 The housing component 1 includes a housing cover 12 that forms an accommodating cavity 13, and the housing cover 12 is a first housing wall 111. As a result, the structural design of the housing component 1 is flexible, and the arrangement position of the pole component 2 is flexible.

[0273] When the shell cover 12 is the first shell wall 111, illustratively, Figure 6 and Figure 7 The shell component 1 may include a shell body 11 and a shell cover 12, one end of the shell body 11 has an opening 113, the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 together form an accommodating cavity 13, and the shell cover 12 serves as the first shell wall 111; or, illustratively, the shell component 1 may include a shell body 11 and two shell covers 12, both ends of the shell body 11 have openings 113, each opening 113 is covered by a shell cover 12, the two shell covers 12 and the shell body 11 together form an accommodating cavity 13, and one of the shell covers 12 serves as the first shell wall 111.

[0274] When the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, for example, Figure 4 and Figure 5 The shell component 1 may include a shell body 11 and a shell cover 12, one end of the shell body 11 has an opening 113, the shell cover 12 covers the opening 113, the shell body 11 and the shell cover 12 together form an accommodating cavity 13, and the end of the shell body 11 opposite to the opening 113 serves as a first shell wall 111; or, illustratively, the shell component 1 may include two shell bodies 11, one end of each shell body 11 has an opening 113, the openings 113 of the two shell bodies 11 are opposite to and cover each other, the two shell bodies 11 together form an accommodating cavity 13, and the end of one shell body 11 opposite to the opening 113 serves as the first shell wall 111.

[0275] In some embodiments of the present application, Figure 4 and Figure 5 The housing component 1 includes a housing body 11 that forms an accommodating cavity 13. One end of the housing body 11 has an opening 113, and the end of the housing body 11 opposite the opening 113 is a first housing wall 111. It is understood that the housing body 11 is a single piece, that is, the housing body 11 is an integrally molded piece, and includes a first housing wall 111 and a second housing wall 114. The second housing wall 114 surrounds the edge of the first housing wall 111 and extends from the edge of the first housing wall 111 toward one side in the thickness direction of the first housing wall 111. The end of the second housing wall 114 facing away from the first housing wall 111 defines the opening 113. A cavity is defined between the first housing wall 111 and the second housing wall 114, and the cavity constitutes at least a portion of the accommodating cavity 13.

[0276] When the shell component 1 includes a shell body 11 with an opening 113 at one end, the shell component 1 also includes a matching shell, which matches the shell body 11 to cover the opening 113 and together with the shell body 11, encloses the accommodating cavity 13. For example, the shell body 11 is an integral part and is semi-enclosed cylindrical, and the matching shell is flat, that is, the matching shell can be the shell cover 12. In this case, the shell component 1 can be a combination of the shell body 11 and the shell cover 12. For another example, the shell body 11 is semi-enclosed cylindrical, and the matching shell can be semi-enclosed cylindrical. In this case, the shell component 1 can be a combination of two semi-enclosed cylindrical openings. As a result, the shell component has various forms and can adapt to various application scenarios.

[0277] In the above technical solution, since the electrode component 3 housed in the shell component 1 is connected to the pole component 2 installed on the first shell wall 111, when the battery 100 vibrates or deforms, the pole components 2 connected by the busbar component will pull each other. Since the pole component 2 is arranged on the end wall of the shell body 11 opposite to the opening 113, the force acting on the pole component 2 will be preferentially transmitted to the shell body 11, and will not directly act on the mating shell (such as the shell cover 12). This not only prolongs the distance for the force to be transmitted to the connection between the shell body 11 and the mating shell (such as the shell cover 12), but also the shell body 11 will preferentially deform when subjected to force, so as to reduce the force at the connection between the shell body 11 and the mating shell (such as the shell cover 12), thereby effectively reducing the probability of cracking at the connection between the shell body 11 and the mating shell (such as the shell cover 12) during use of the battery 100, thereby improving the reliability of the battery cell 102. Furthermore, because the connection between the shell body 11 and the mating shell (e.g., the shell cover 12) is less susceptible to cracking, there is no need to increase the wall thickness of the two to improve the reliability of the connection, thereby reducing weight and material costs, and facilitating miniaturization of the battery cell 102 or increasing the energy density of the battery cell 102. The connection method between the shell body 11 and the mating shell is not limited, and can be, for example, bonding, welding, etc.

[0278] For example, when the end wall of the shell 11 opposite the opening 113 serves as the first shell wall 111 for mounting the pole component 2, if the pole component 2 is first mounted at the mounting hole 112 of the first shell wall 111 and then the electrode component 3 is installed into the shell 11, it will be difficult to connect the electrode component 3 to the pole component 2. In some embodiments of the present application, the electrode component 3 and the pole component 2 can be connected first and then the pole component 2 can be assembled and connected to the shell component 1, thereby meeting the connection requirements between the electrode component 3 and the pole component 2 and the connection requirements between the pole component 2 and the shell component 1, thereby improving the reliability and workability of the battery cell 102. Moreover, this processing sequence can effectively shorten the length of the conductive part 4. For example, as long as the electrode component 3 and the pole component 2 are connected first, and the pole component 2 and the shell component 1 are connected later, it is sufficient to save the material and cost of the conductive part 4, reduce the redundancy of the conductive part 4, reduce the risk of short circuit, and reduce the space occupied by the conductive part 4 in the shell component 1, which is beneficial to improving the energy density of the battery cell 102.

[0279] The material of the housing component 1 is not limited, for example, including but not limited to aluminum shell, steel shell, aluminum-plastic film, plastic or other electrolyte corrosion-resistant materials.

[0280] Please refer to Figures 8-10 In some embodiments of the present application, the pole component 2 includes a pole body 21, a transition structure 22 and an insulating sealing structure 23. The transition structure 22 surrounds the pole body 21 and is connected to the first shell wall 111. The insulating sealing structure 23 is insulated and sealed between the transition structure 22 and the pole body 21. The pole body 21 is connected to the electrode component 3.

[0281] The adapter structure 22 surrounds the entire circumference of the pole body 21 along the circumference of the mounting hole 112, thereby connecting the pole body 21 to the first shell wall 111 in the outer peripheral region of the pole body 21. The insulating sealing structure 23 insulates the adapter structure 22 from the pole body 21 and seals the mating position between the adapter structure 22 and the pole body 21. This isolates the inside and outside of the shell component 1 after the adapter structure 22 is connected to the first shell wall 111, reducing the risk of electrolyte in the shell component 1 leaking out of the shell component 1 from the mating position between the adapter structure 22 and the pole body 21, and reducing the risk of liquid or dust outside the shell component 1 entering the shell component 1 from the mating position between the adapter structure 22 and the pole body 21, thereby improving the reliability of the battery cell 102.

[0282] The connection method between the transition structure 22 and the first shell wall 111 is not limited, for example, welding, riveting, punching, bonding, etc. In addition, the connection between the pole body 21 and the electrode component 3 can be that the electrode component 3 is connected to the pole body 21 via the conductive portion 4. The connection method between the conductive portion 4 and the pole body 21 is not limited, for example, welding, riveting, punching, bonding, etc.

[0283] In summary, when the shell component 1 includes a first shell wall 111, a mounting hole 112 is formed on the first shell wall 111; the electrode component 3 is accommodated in the shell component 1; the pole component 2 and the first shell wall 111 are located on the same side of the electrode component 3 and are installed at the mounting hole 112, the pole component 2 includes a pole body 21, a transition structure 22 and an insulating sealing structure 23, the pole body 21 is connected to the electrode component 3, the transition structure 22 surrounds the pole body 21 and is connected to the first shell wall 111, and the insulating sealing structure 23 When the pole part 2 includes the pole body 21 connected to the electrode part 3, the pole part 2 also includes the transition structure 22 connected to the first shell wall 111, and an insulating sealing structure 23 is provided between the transition structure 22 and the pole body 21. The pole body 21 and the transition structure 22 are connected to each other, and the pole part 2 has a self-sealing property, which is convenient for the installation and matching of the pole part 2 and the shell part 1. On the other hand, when the pole body needs to be pressed against the seal placed on the first shell wall to achieve the sealing of the battery cell, in order to ensure the pre-tightening force required for the sealing, the pressure applied by the pole component to the first shell wall needs to be relatively large. When the shell thickness is thin, it is easy to cause deformation or damage to the first shell wall. Therefore, through such an arrangement, when the pole component 2 is installed on the first shell wall 111, there is no need to consider the insulation and sealing issues between the adapter structure 22 and the first shell wall 111. It is only necessary to complete a reliable connection throughout the whole circle (for example, the adapter structure 22 and the first shell wall 111 can be made of the same material and welded together). Therefore, there is no need to apply a large force to the pole component 2 in order to meet the sealing requirements of the connection between the adapter structure 22 and the first shell wall 111, thereby improving the problem of stress deformation of the first shell wall 111, which is conducive to reducing the wall thickness of the first shell wall 111, reducing material costs, and reducing the weight of the battery cell 102, achieving lightweight production, and improving energy density. In addition, when the first shell wall 111 is the end opposite to the shell body 11 and the opening 113, the force at the connection between the first shell wall 111 and the second shell wall 114 can be reduced, as well as the force on the second shell wall 114, thereby improving the reliability of the shell body 11, reducing the wall thickness and cost of the shell body 11, and reducing the weight of the battery cell 102, thereby achieving lightweight production.

[0284] For example, the pole component 2 can be tested for air tightness when it is received or when the pole component 2 is processed to determine whether a reliable seal is formed at the connection position between the adapter structure 22 and the pole body 21. If the seal is reliable, the pole component 2 can be connected to the first shell wall 111.

[0285] The shapes of the adapter structure 22 and the pole body 21 are not limited. For example, either one of them can be processed into a circle, an ellipse, a rectangle, a rectangle with rounded corners, etc.

[0286] Please refer again Figures 8-10 In some embodiments of the present application, the insulating sealing structure 23 includes a sealing structure member 231, wherein the sealing structure member 231 is made of a material that has both sealing and insulating properties, such as an elastic rubber member, so that the required sealing requirements can be met by designing the shape and position of the sealing structure member 231.

[0287] Please refer again Figures 8-10 In some embodiments of the present application, at least a portion of the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 in the inward and outward directions of the first shell wall 111 (eg, the fifth direction F5 ).

[0288] In the embodiment of the present application, the direction from the inner side of the first shell wall 111 to the outer side of the first shell wall 111, and the direction from the outer side of the first shell wall 111 to the inner side of the first shell wall 111, are collectively referred to as the "inside-outside direction of the first shell wall 111 (e.g., the fifth direction F5)." The "inside of the first shell wall 111" refers to the side of the first shell wall 111 close to the electrode component 3 (or the side close to the active material coating portion 32), and the "outside of the first shell wall 111" refers to the side of the first shell wall 111 facing away from the electrode component 3 (or the side facing away from the active material coating portion 32).

[0289] See again Figure 10 The sealing structure 231 includes at least a shaft side portion 231a, the side of the shaft side portion 231a close to the accommodating cavity 13 is the inner side of the shaft side portion 231a, and the side of the shaft side portion 231a away from the electrode component 3 is the outer side of the shaft side portion 231a. One of the transition structure 22 and the pole body 21 is partially clamped on the outer side of the shaft side portion 231a, and the other part is clamped on the inner side of the shaft side portion 231a, so that the shaft side portion 231a is clamped between the transition structure 22 and the pole body 21 in the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) to achieve axial sealing between the transition structure 22 and the pole body 21.

[0290] Thus, by providing at least a portion of the sealing structure 231 to be clamped between the transition structure 22 and the pole body 21 in the inner and outer directions of the first shell wall 111 (e.g., the fifth direction F5), an axial seal is achieved between the transition structure 22 and the pole body 21. Utilizing the axial seal can provide a relatively reliable sealing effect, thereby improving the electrolyte leakage problem that occurs at the mating position between the transition structure 22 and the pole body 21. In addition, if the pole component only includes the pole body, an axial seal is provided between the pole body and the first shell wall. Therefore, it is necessary to apply sealing pressure along the axial direction of the mounting hole, which will cause excessive force on the first shell wall. However, in the embodiments of the present application, by integrating the axial seal (e.g., the axial side portion 231a) into the pole component, the axial force acting on the first shell wall 111 can be reduced, thereby improving the reliability of the first shell wall 111 and appropriately thinning the first shell wall 111 to reduce costs and increase energy density.

[0291] Please refer again Figure 10 In some embodiments of the present application, a sealing structure 231 is disposed around the circumference of the adapter structure 22 near the pole body 21. In the embodiments of the present application, since the adapter structure 22 is disposed around the pole body 21 and connected to the first shell wall 111, the circumference of the adapter structure 22 near the pole body 21 is referred to as the "inner ring portion 2211 of the adapter structure 22," and the circumference of the adapter structure 22 near the first shell wall 111 is referred to as the "outer ring portion 2212 of the adapter structure 22." Therefore, the sealing structure 231 being disposed around the circumference of the adapter structure 22 near the pole body 21 can be understood as extending along the entire circumference of the inner ring portion of the adapter structure 22. The sealing structure 231 can be located in the annular hole region and / or axial side region (axial side refers to both sides in the direction through the annular hole) of the inner ring portion of the adapter structure 22, thereby ensuring that the sealing structure 231 is disposed around the circumference of the adapter structure 22 near the pole body 21.

[0292] In the above technical solution, by arranging the sealing structure 231 on the inner ring part of the transition structure 22, the sealing structure 231 can achieve a sealing effect throughout the entire circumference, and the arrangement position is close to the matching position of the transition structure 22 and the pole body 21, which is conducive to sealing the matching position of the transition structure 22 and the pole body 21 in a shorter path, thereby improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily achieving compression sealing on it, so that the seal is not easy to fail, thereby improving the sealing effect.

[0293] Please refer again Figure 10In some embodiments of the present application, the pole body 21 includes a peripheral portion 212, and the transition structure 22 is clamped on both sides of the peripheral portion 212 in the inner and outer directions (for example, the fifth direction F5) of the first shell wall 111 through the insulating sealing structure 23, and the sealing structure 231 extends along the circumference of the peripheral portion 212 and is clamped between the peripheral portion 212 and the transition structure 22.

[0294] In this embodiment, the peripheral portion 212 can be the peripheral structure of the pole body 21, the side of the peripheral portion 212 facing away from the electrode component 3 is the outer side of the peripheral portion 212, and the side of the peripheral portion 212 close to the accommodating cavity 13 is the inner side of the peripheral portion 212. The relative position of the sealing structure 231 and the peripheral portion 212 is not limited. For example, at least a portion of the sealing structure 231 (for example Figure 10 The first portion 2311 of the sealing structure 231 shown in the figure is clamped on the side of the peripheral portion 212 close to the accommodating cavity 13, or at least a portion of the sealing structure 231 is clamped on the side of the peripheral portion 212 away from the electrode component 3, or at least a portion of the sealing structure 231 is clamped on the radially outer side of the peripheral portion 212.

[0295] The transition structure 22 is limited to the outside of the peripheral portion 212 by the insulating sealing structure 23 to limit the movement of the pole body 21 relative to the transition structure 22 in the direction away from the electrode component 3. The transition structure 22 is also limited to the inside of the peripheral portion 212 by the insulating sealing structure 23 to limit the movement of the pole body 21 relative to the transition structure 22 in the direction close to the accommodating cavity 13, thereby achieving the transition structure 22 being clamped on both sides of the peripheral portion 212 in the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the insulating sealing structure 23.

[0296] In the above technical solution, the pole component 2 has a simple structure and is easy to process, which can simply and effectively achieve relative fixation and insulation between the pole body 21 and the adapter structure 22. Furthermore, the peripheral portion 212 of the pole body 21 and the adapter structure 22 are used to clamp the sealing structure 231, so that the sealing structure 231 can be positioned at the mating position of the adapter structure 22 and the pole body 21. This facilitates sealing the mating position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal. It also helps to reduce the size of the sealing structure 231, reduce the sealing area, facilitate compression sealing, and reduce the seal failure, thereby improving the sealing effect.

[0297] Please refer again Figure 10, exemplarily, at least a portion of the sealing structure 231 is arranged on a side of the peripheral portion 212 close to or away from the electrode component 3, that is, the sealing structure 231 includes an axial side portion 231a, and the axial side portion 231a is arranged on a side of the peripheral portion 212 close to or away from the electrode component 3, so as to be clamped between the peripheral portion 212 and the transition structure 22 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5).

[0298] In the embodiment of the present application, the "side close to the electrode component 3" refers to the side close to the active material coating portion 32, or the side close to the accommodating cavity 13, or the inner side. The "side away from the electrode component 3" refers to the side away from the active material coating portion 32, or the side away from the electrode component 3, or the outer side.

[0299] When the axial side portion 231a is arranged on the side of the peripheral portion 212 close to the electrode component 3, the peripheral portion 212 is clamped on the outer side of the axial side portion 231a (i.e., the side away from the electrode component 3). At this time, the inner side of the axial side portion 231a (i.e., the side close to the accommodating cavity 13) is clamped by the transition structure 22, so that the axial side portion 231a is clamped between the peripheral portion 212 and the transition structure 22 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5).

[0300] When the axial side portion 231a is arranged on the side of the peripheral portion 212 away from the electrode component 3, the peripheral portion 212 is clamped on the inner side of the axial side portion 231a (i.e., the side close to the accommodating cavity 13). At this time, the outer side of the axial side portion 231a (i.e., the side away from the electrode component 3) is clamped by the transition structure 22, so that the axial side portion 231a is clamped between the peripheral portion 212 and the transition structure 22 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5).

[0301] As a result, a more reliable sealing effect can be achieved between the transition structure 22 and the pole body 21 through axial sealing. If the pole component only includes the pole body, and an axial seal is provided between the pole body and the first shell wall, it is necessary to apply sealing pressure along the axial direction of the mounting hole, which will cause the first shell wall to be subjected to excessive force. However, the embodiment of the present application can reduce the axial force acting on the first shell wall 111 by integrating the axial seal (such as the axial side portion 231a) into the pole component. In addition, when at least part of the sealing structure 231 is provided on the side of the peripheral portion 212 close to the electrode component 3, it can be sealed from the side of the peripheral portion 212 close to the accommodating cavity 13, which can more effectively inhibit the leakage of electrolyte from the matching position of the pole body 21 and the transition structure 22, thereby improving the sealing effect.

[0302] Please refer again Figure 10For example, the insulating sealing structure 23 further includes a first insulating member 232. The transition structure 22 is clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the first insulating member 232 and the sealing structure 231. In this embodiment, the transition structure 22 is not limited in composition and can be a single component or a combination of multiple components (e.g., two or more).

[0303] When at least a portion of the sealing structure 231 (such as the axial side portion 231a) is arranged on the side of the peripheral portion 212 close to the electrode component 3, at least a portion of the first insulating member 232 is arranged on the side of the peripheral portion 212 away from the electrode component 3, the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the first insulating member 232 and the sealing structure 231 respectively.

[0304] When at least a portion of the sealing structure 231 (such as the axial side portion 231a) is arranged on the side of the peripheral portion 212 away from the electrode component 3, at least a portion of the first insulating member 232 is arranged on the side of the peripheral portion 212 close to the electrode component 3, the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the first insulating member 232 and the sealing structure 231 respectively.

[0305] In the above technical solution, since the insulating sealing structure 23 includes a first insulating member 232 and a sealing structure member 231 that are not integrated into one piece, the design and processing of the insulating sealing structure 23 can be simplified. Moreover, according to the specific matching requirements with the pole body 21 and the transition structure 22, the first insulating member 232 can be set to be an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the first insulating member 232 can be set to be a compressible sealing member that has a sealing effect (such as an elastic rubber member), so as to meet different actual requirements. In addition, when the first insulating member 232 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure member 231 and improve the sealing effect.

[0306] Alternatively, please combine Figure 11 , Figure 11This is a cross-sectional view of a pole component provided in some embodiments of the present application. In some other embodiments of the present application, the sealing structure 231 is an integral structure and surrounds the peripheral portion 212, so as to be located on a side of the peripheral portion 212 close to the electrode component 3 and a side away from the electrode component 3, respectively. The adapter structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions of the first shell wall 111 (e.g., the fifth direction F5) by the sealing structure 231. In this embodiment, the configuration of the adapter structure 22 is not limited and can be a single component or a combination of multiple components (e.g., two or more).

[0307] That is, the sealing structure 231 is an integral annular structure that provides both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on both the inner and outer sides of the peripheral portion 212, and the axial side portions 231a on the inner and outer sides of the peripheral portion 212 are connected by a peripheral side portion 231b located on the outer circumference of the peripheral portion 212. In this way, the transition structure 22 can be clamped by the two axial side portions 231a of the sealing structure 231 on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111. In the above technical solution, because the sealing structure 231 is an integral structure and outstrips the peripheral portion 212, the number of parts and assembly steps can be reduced.

[0308] Please refer again Figures 8-10 In some embodiments of the present application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is disposed on a side of the first adapter ring 221 that is close to or away from the electrode component 3. The second adapter ring 222 is connected to the first adapter ring 221, and one of the first adapter ring 221 and the second adapter ring 222 is connected to the first shell wall 111. For example, the first adapter ring 221 and the second adapter ring 222 can be connected by welding, riveting, punching, or gluing. For example, the outer ring portion of one of the first adapter ring 221 and the second adapter ring 222 is connected to the first shell wall 111 by welding, riveting, punching, or gluing.

[0309] The end of the first adapter ring 221 close to the pole body 21 (i.e., the inner ring portion of the first adapter ring 221) and the end of the second adapter ring 222 close to the pole body 21 (i.e., the inner ring portion of the second adapter ring 222) are spaced apart along the inward and outward directions of the first shell wall 111 (e.g., the fifth direction F5), so as to be clamped on both sides of the peripheral portion 212 along the inward and outward directions of the first shell wall 111 (e.g., the fifth direction F5) through the insulating sealing structure 23, and the sealing structure 231 is clamped between at least one of the first adapter ring 221 and the second adapter ring 222 and the peripheral portion 212.

[0310] That is, the second adapter ring 222 is disposed on the inner side or the outer side of the first adapter ring 221, and the inner ring portions of the first adapter ring 221 and the second adapter ring 222 are respectively clamped on the inner and outer sides of the peripheral portion 212 via the insulating sealing structure 23. For example, the sealing structure 231 may include an axial side portion 231a clamped between the inner ring portion of the first adapter ring 221 and the peripheral portion 212 in the in-outward direction (e.g., the fifth direction F5) of the first shell wall 111, and / or an axial side portion 231a clamped between the inner ring portion of the second adapter ring 222 and the peripheral portion 212 in the in-outward direction (e.g., the fifth direction F5) of the first shell wall 111.

[0311] For example, combined with Figure 10 The second adapter ring 222 is arranged on the side of the first adapter ring 221 away from the electrode component 3 (that is, the second adapter ring 222 is arranged on the outside of the first adapter ring 221). At this time, the inner ring part of the second adapter ring 222 is clamped on the outside of the peripheral portion 212 through the insulating sealing structure 23, and the inner ring part of the first adapter ring 221 is clamped on the inner side of the peripheral portion 212 through the insulating sealing structure 23. At this time, the sealing structure 231 in the insulating sealing structure 23 can be clamped between the inner ring part of the first adapter ring 221 and the peripheral portion 212, and can also be clamped between the inner ring part of the second adapter ring 222 and the peripheral portion 212.

[0312] For another example, the second adapter ring 222 is arranged on the side of the first adapter ring 221 close to the electrode component 3 (that is, the second adapter ring 222 is arranged on the inner side of the first adapter ring 221). At this time, the inner ring part of the second adapter ring 222 is clamped on the inner side of the peripheral portion 212 through the insulating sealing structure 23, and the inner ring part of the first adapter ring 221 is clamped on the outer side of the peripheral portion 212 through the insulating sealing structure 23. At this time, the sealing structure 231 in the insulating sealing structure 23 can be clamped between the inner ring part of the first adapter ring 221 and the peripheral portion 212, and can also be clamped between the inner ring part of the second adapter ring 222 and the peripheral portion 212.

[0313] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 that are arranged inside and outside and assembled and connected, thereby facilitating the assembly connection of the adapter structure 22 with the insulating sealing structure 23 and the pole body 21, making the pole component 2 easy to process and manufacture, and easy to control the compression amount of the sealing structure 231, thereby improving the sealing reliability.

[0314] Illustratively, 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, which is beneficial to improving the welding yield.

[0315] Please refer again Figures 8-10In some embodiments of the present application, the insulating sealing structure 23 also includes a first insulating member 232, at least a portion of the sealing structure member 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 with the peripheral portion 212 through the first insulating member 232.

[0316] Combine Figure 10 The sealing structure 231 extends along the entire circumference of the inner ring portion of the first adapter ring 221 to be clamped between the inner ring portion of the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated from and fixedly engaged with the peripheral portion 212 by the first insulating member 232. Exemplarily, the sealing structure 231 may include an axial side portion 231a that is clamped between the inner ring portion of the first adapter ring 221 and the peripheral portion 212 in the inward-outward direction (e.g., the fifth direction F5) of the first housing wall 111.

[0317] In the above technical solution, since the insulating sealing structure 23 includes a first insulating member 232 and a sealing structure member 231 that are not integrated into one piece, the design and processing of the insulating sealing structure 23 can be simplified. In addition, according to the specific matching requirements with the pole body 21 and the transition structure 22, the first insulating member 232 can be set to be an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the first insulating member 232 can be set to be a compressible sealing member that has a sealing effect (such as an elastic rubber member), so as to meet different actual requirements. In addition, when the first insulating member 232 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure member 231 and improve the sealing effect.

[0318] The second adapter ring 222 is insulated and fixedly fitted with the peripheral portion 212 by the first insulating member 232 in any manner.

[0319] For example, refer again to Figures 8-10 When the sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212 , the first insulating member 232 and the pole body 21 , as well as the first insulating member 232 and the second adapter ring 222 , can be connected by injection molding respectively.

[0320] Illustratively, the first insulating member 232 is an injection-molded part and is injection-molded together with the pole body 21 and the second adapter ring 222. This ensures that the pole body 21 and the second adapter ring 222 are insulated and securely mated via the first insulating member 232. For example, when processing the pole component 2, the pole body 21 and the second adapter ring 222 can first be injection-molded together, followed by assembling the sealing structure 231 and the first adapter ring 221. Finally, the first adapter ring 221 and the second adapter ring 222 are connected (e.g., welded), and the sealing structure 231 is compressed.

[0321] Therefore, the pole component 2 can be easily processed, and reliable connection and insulation matching between the transition structure 22 and the pole body 21 can be achieved.

[0322] For another example, please refer to Figure 12 , Figure 12 This is a cross-sectional view of a pole component provided in some embodiments of the present application. When the sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212, the second adapter ring 222 may include a stop ring portion 2221. At least a portion of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 along the inward-outward direction (e.g., the fifth direction F5) of the first shell wall 111. In this embodiment, the material of the first insulating member 232 is not limited and may be, for example, a plastic member or an elastic rubber member.

[0323] Therefore, by providing the second adapter ring 222 connected to the first adapter ring 221 and utilizing the stop ring portion 2221 of the second adapter ring 222 and the peripheral portion 212 to clamp the first insulating member 232 , the injection molding process can be omitted.

[0324] In some embodiments of the present application, the first insulating member 232 may not be provided. For example, please refer to Figure 11 The sealing structure 231 is an integral structure and outstrips the peripheral portion 212, so as to be respectively located on the side of the peripheral portion 212 close to the electrode component 3 and the side away from the electrode component 3. The first adapter ring 221 and the second adapter ring 222 are respectively clamped on both sides of the sealing structure 231 away from the peripheral portion 212 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5).

[0325] That is, the sealing structure 231 is an integral annular structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the peripheral portion 212, and the axial side portions 231a on the inner and outer sides of the peripheral portion 212 are connected by the peripheral side portions 231b located on the peripheral side of the peripheral portion 212. In this way, one of the first adapter ring 221 and the second adapter ring 222 is clamped on the outer side of the axial side portion 231a on the outer side of the peripheral portion 212, and the other is clamped on the inner side of the axial side portion 231a on the inner side of the peripheral portion 212.

[0326] In the above technical solution, since the sealing structural member 231 is an integral structural member and outsources the peripheral portion 212 , the number of parts and the number of assembly steps can be reduced.

[0327] Please refer again Figure 10-12In some embodiments of the present application, the first adapter ring 221 is connected to the first shell wall 111, and the second adapter ring 222 is disposed on the side of the first adapter ring 221 facing away from the electrode component 3. That is, the second adapter ring 222 is disposed outside the first adapter ring 221, and at least a portion of the sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212. For example, the insulating sealing structure 23 of this embodiment can be a combination of the first insulating member 232 and the sealing structure 231, or the sealing structure 231 can be an integral structure that surrounds the peripheral portion 212.

[0328] Thus, sealing can be achieved from the side of the peripheral portion 212 closest to the accommodating cavity 13, more effectively preventing leakage of electrolyte from the mating position between the pole body 21 and the adapter structure 22, thereby improving the sealing effect. Furthermore, the pole component 2 of this structure can determine the relative positions of various parts of the pole component 2 and the first shell wall 111 through the structural design of the first adapter ring 221, allowing for flexible design as needed to reduce the space occupied by the pole component 2 inside or outside the shell component 1.

[0329] Exemplarily, when the first adapter ring 221 is connected to the first shell wall 111, the second adapter ring 222 is arranged on the side of the first adapter ring 221 facing away from the electrode component 3, and at least a portion of the sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212, at least a portion of the sealing structure 231 can be clamped between the peripheral portion 212 and the first adapter ring 221 along the inward and outward directions of the first shell wall 111 (for example, the fifth direction F5), that is, the sealing structure 231 includes an axial side portion 231a clamped between the peripheral portion 212 and the first adapter ring 221 along the inward and outward directions, thereby achieving an axial sealing effect.

[0330] Please refer again Figure 10 In some embodiments of the present application, the first adapter ring 221 and the second adapter ring 222 are both metal rings and are welded together, and the first adapter ring 221 is welded to the first shell wall 111. As a result, the adapter structure 22 has good structural strength and is suitable for connection with the first shell wall 111 made of metal.

[0331] Please refer again Figure 10 Exemplarily, the adapter structure 22 further includes a first insulating frame 224, which is connected to the side of the first adapter ring 221 near the electrode component 3. Thus, the first insulating frame 224 can be used to insulate between the electrode component 3 and the first adapter ring 221, reducing the difficulty of providing an insulating sealing structure. Exemplarily, the first insulating frame 224 has a pin, and the first adapter ring 221 has a socket. The pin is inserted into the socket through an interference fit to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0332] Please refer again Figure 10-12 In some embodiments of the present application, a surface of the first adapter ring 221 adjacent to the second adapter ring 222 has a first annular groove 2213 that matches the shape of the second adapter ring 222, and the second adapter ring 222 is embedded in the first annular groove 2213. That is, the shape of the first annular groove 2213 matches the shape of the corresponding portion of the second adapter ring 222, and at least a portion of the second adapter ring 222 is sunken into the first annular groove 2213. For example, the thickness of the sunken portion can be equal to, or slightly larger or smaller than, the depth of the first annular groove 2213.

[0333] For example, when the second adapter ring 222 is disposed on the outside of the first adapter ring 221, the first adapter ring 221 has a first annular groove 2213 on a side surface facing away from the electrode component 3 (i.e., the outer surface). For another example, when the second adapter ring 222 is disposed on the inside of the first adapter ring 221, the first adapter ring 221 has a first annular groove 2213 on a side surface close to the electrode component 3 (i.e., the inner surface).

[0334] Therefore, the first annular groove 2213 can be provided to position the second adapter ring 222 , thereby improving the assembly efficiency and connection reliability of the first adapter ring 221 and the second adapter ring 222 .

[0335] Please refer to Figure 13 , Figure 13 A cross-sectional view of a pole assembly provided in some embodiments of the present application. In some embodiments of the present application, the adapter structure 22 includes a third adapter ring 223, which includes an integral first extension portion 2231 and a second extension portion 2232. In other words, the first extension portion 2231 and the second extension portion 2232 are distinct parts of a single, integrated component, rather than two separate parts connected by an assembly. The third adapter ring 223 can be connected to the first housing wall 111 in any manner, including welding, riveting, punching, bonding, and the like.

[0336] Among them, the end of the first extension portion 2231 close to the pole body 21 (i.e., the inner ring portion of the first extension portion 2231) and the end of the second extension portion 2232 close to the pole body 21 (i.e., the inner ring portion of the second extension portion 2232) are spaced along the inner and outer directions, so as to be clamped on both sides of the peripheral portion 212 along the inner and outer directions (for example, the fifth direction F5) of the first shell wall 111 through the insulating sealing structure 23, and the sealing structure 231 is clamped between at least one of the first extension portion 2231 and the second extension portion 2232 and the peripheral portion 212.

[0337] That is, the first extension portion 2231 and the second extension portion 2232 are respectively clamped on the inner and outer sides of the peripheral portion 212 by the insulating sealing structure 23. For example, the sealing structure 231 may include an axial side portion 231a clamped between the inner ring portion of the first extension portion 2231 and the peripheral portion 212 in the inner-outer direction of the first shell wall 111 (e.g., the fifth direction F5), and / or an axial side portion 231a clamped between the inner ring portion of the second extension portion 2232 and the peripheral portion 212 in the inner-outer direction of the first shell wall 111 (e.g., the fifth direction F5).

[0338] For example, combined with Figure 13 The second extension portion 2232 is arranged on the side of the first extension portion 2231 away from the electrode component 3 (that is, the second extension portion 2232 is arranged on the outside of the first extension portion 2231). At this time, the inner ring portion of the second extension portion 2232 is clamped on the outside of the peripheral portion 212 through the insulating sealing structure 23, and the inner ring portion of the first extension portion 2231 is clamped on the inner side of the peripheral portion 212 through the insulating sealing structure 23. At this time, the sealing structure 231 in the insulating sealing structure 23 can be clamped between the inner ring portion of the first extension portion 2231 and the peripheral portion 212, or between the inner ring portion of the second extension portion 2232 and the peripheral portion 212.

[0339] For another example, the second extension portion 2232 is arranged on the side of the first extension portion 2231 close to the electrode component 3 (that is, the second extension portion 2232 is arranged on the inner side of the first extension portion 2231). At this time, the inner ring portion of the second extension portion 2232 is clamped on the inner side of the peripheral portion 212 through the insulating sealing structure 23, and the inner ring portion of the first extension portion 2231 is clamped on the outer side of the peripheral portion 212 through the insulating sealing structure 23. At this time, the sealing structure 231 in the insulating sealing structure 23 can be clamped between the inner ring portion of the first extension portion 2231 and the peripheral portion 212, or can be clamped between the inner ring portion of the second extension portion 2232 and the peripheral portion 212.

[0340] Therefore, since the third adapter ring 223 includes the first extension portion 2231 and the second extension portion 2232 that are integrally arranged, the first extension portion 2231 and the second extension portion 2232 are integrated into the same structural component, thereby eliminating the process of connecting the first extension portion 2231 and the second extension portion 2232, reducing the use of parts, and the first extension portion 2231 and the second extension portion 2232 are not easy to separate, which can improve the reliability of clamping the peripheral portion 212 through the insulating sealing structure 23.

[0341] Exemplarily, the third adapter ring 223 and the first shell wall 111 are both made of aluminum and are welded together, which helps to improve the welding yield.

[0342] Please refer again Figure 13In some embodiments of the present application, the insulating sealing structure 23 also includes a first insulating member 232, at least a portion of the sealing structure member 231 is clamped between the first extension portion 2231 and the peripheral portion 212, and the second extension portion 2232 is insulated and fixedly fitted with the peripheral portion 212 through the first insulating member 232.

[0343] Combine Figure 13 The sealing structure 231 extends along the entire circumference of the first extension portion 2231 to be clamped between the inner ring portion of the first extension portion 2231 and the peripheral portion 212. The second extension portion 2232 is insulated from and fixedly engaged with the peripheral portion 212 by the first insulating member 232. Exemplarily, the sealing structure 231 may include an axial side portion 231a clamped between the inner ring portion of the first extension portion 2231 and the peripheral portion 212 in the inward-outward direction (e.g., the fifth direction F5) of the first housing wall 111.

[0344] In the above technical solution, since the insulating sealing structure 23 includes a first insulating member 232 and a sealing structure member 231 that are not integrated into one piece, the design and processing of the insulating sealing structure 23 can be simplified. In addition, according to the specific matching requirements with the pole body 21 and the transition structure 22, the first insulating member 232 can be set to be an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the first insulating member 232 can be set to be a compressible sealing member that has a sealing effect (such as an elastic rubber member), so as to meet different actual requirements. In addition, when the first insulating member 232 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure member 231 and improve the sealing effect.

[0345] The matching manner between the first insulating member 232 and the second extending portion 2232 is not limited.

[0346] For example, refer again to Figure 13 , the second extension portion 2232 rivets the first insulating member 232 against the peripheral portion 212. That is, the second extension portion 2232 presses the first insulating member 232 through the riveting process, so that the first insulating member 232 is clamped between the peripheral portion 212 and the second extension portion 2232, thereby realizing the assembly of the third adapter ring 223 with the pole body 21 and the insulating sealing structure 23 without the need for an assembly welding process. In this embodiment, the material of the first insulating member 232 is not limited, for example, it can be a plastic member or an elastic rubber member. For example, when only the second extension portion 2232 of the first extension portion 2231 and the second extension portion 2232 is riveted, the sealing structure 231 is clamped between the first extension portion 2231 and the peripheral portion 212, which makes it easy to control the compression amount of the sealing structure 231 and achieve a better compression effect.

[0347] Please refer to Figure 14 , Figure 14 A cross-sectional view of a pole component provided in some embodiments of the present application; in some embodiments of the present application, the first insulating member 232 and the pole body 21, as well as the first insulating member 232 and the second extension portion 2232 are respectively injection-molded, and the first extension portion 2231 rivets the sealing structure 231 against the peripheral portion 212.

[0348] Illustratively, the first insulating member 232 is an injection-molded part and is injection-molded together with the pole body 21 and the second extension 2232. This ensures that the pole body 21 and the second extension 2232 are insulated and securely mated via the first insulating member 232. When manufacturing the pole component 2, the pole body 21 and the third adapter ring 223 can first be injection-molded together, followed by the assembly of the sealing structure 231. Finally, the first extension 2231 is riveted to secure the sealing structure 231. This facilitates the processing of the pole component 2 and ensures a secure connection and insulation between the adapter structure 22 and the pole body 21.

[0349] Please refer to Figure 15 , Figure 15 A cross-sectional view of a pole component provided for some embodiments of the present application; in some embodiments of the present application, the sealing structure 231 is an integral structure and outwardly surrounds the peripheral portion 212, so as to be respectively located on the side of the peripheral portion 212 close to the electrode component 3 and the side away from the electrode component 3, and the first extension portion 2231 and the second extension portion 2232 are respectively clamped on both sides of the sealing structure 231 away from the peripheral portion 212 in the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5).

[0350] That is, the sealing structure 231 is an integral annular structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the peripheral portion 212, and the axial side portions 231a on the inner and outer sides of the peripheral portion 212 are connected by the peripheral side portions 231b located on the peripheral side of the peripheral portion 212. In this way, one of the first extension portion 2231 and the second extension portion 2232 is clamped on the outer side of the axial side portion 231a on the outer side of the peripheral portion 212, and the other is clamped on the inner side of the axial side portion 231a on the inner side of the peripheral portion 212.

[0351] In the above technical solution, since the sealing structural member 231 is an integral structural member and outsources the peripheral portion 212 , the number of parts and the number of assembly steps can be reduced.

[0352] Please refer again Figure 15 In some embodiments of the present application, one of the first extension portion 2231 and the second extension portion 2232 rivets the sealing structure 231 against the peripheral portion 212 .

[0353] That is, the first extension portion 2231 or the second extension portion 2232 is pressed against the sealing structure 231 through a riveting process, so that the first extension portion 2231 and the second extension portion 2232 are respectively clamped on both sides of the peripheral portion 212 through the sealing structure 231, thereby assembling the third adapter ring 223 with the pole body 21 and the insulating sealing structure 23 without the need for an assembly welding process.

[0354] Please refer again Figure 13 、 Figure 14 and Figure 15 In some embodiments of the present application, one of the first extension portion 2231 and the second extension portion 2232 is a preformed portion 223a, and the other is a riveted portion 223b. For example, when the first extension portion 2231 is the preformed portion 223a, the second extension portion 2232 is the riveted portion 223b. For another example, when the second extension portion 2232 is the preformed portion 223a, the first extension portion 2231 is the riveted portion 223b. The fixed end 223a1 of the preformed portion 223a is connected to the first shell wall 111 (e.g., by welding, riveting, punching, or adhesive bonding), and the fixed end 223b1 of the riveted portion 223b is connected to the preformed portion 223a. The riveted portion 223b rivets the insulating sealing structure 23 against the peripheral portion 212. Therefore, the third adapter ring 223 can clamp the peripheral portion 212 through the insulating sealing structure 23 by pre-processing and riveting, thereby eliminating the need for assembly and welding processes.

[0355] For example, the preformed portion 223a can be formed by processes such as stamping, thinning, stretching, and bending. During the assembly of the third adapter ring 223 with the insulating sealing structure 23 and the pole body 21, the preformed portion 223a no longer deforms, while the riveted portion 223b deforms relative to the preformed portion 223a through riveting, thereby compressing the insulating sealing structure 23 through riveting, allowing the third adapter ring 223 to clamp the peripheral portion 212 through the insulating sealing structure 23. During the riveting process, the fixed end 223b1 of the riveted portion 223b remains connected to the preformed portion 223a, and their relative positions remain unchanged.

[0356] Please refer again Figure 13-Figure 17In some embodiments of the present application, the preformed portion 223a includes an outer ring portion 223a2 and an inner ring portion 223a3. The outer ring portion 223a2 is connected to the first housing wall 111 and surrounds the riveted portion 223b and the inner ring portion 223a3. The inner ring portion 223a3 and the riveted portion 223b are respectively clamped on either side of the peripheral portion 212 along the inner-outer direction (e.g., the fifth direction F5) of the first housing wall 111 via the insulating sealing structure 23. The riveted portion 223b and the inner ring portion 223a3 are respectively connected to the outer ring portion 223a2. As a result, the third adapter ring 223 has a simple structure and is easy to process and manufacture.

[0357] Exemplarily, the pre-formed portion 223a includes an outer ring portion 223a2 and an inner ring portion 223a3, the outer ring portion of the outer ring portion 223a2 is connected to the first shell wall 111 (for example, welded), the fixed end 223b1 of the riveted forming portion 223b and the outer ring portion of the inner ring portion 223a3 are respectively connected to the inner ring portion of the outer ring portion 223a2 (for example, integrally formed), the inner ring portion of the inner ring portion 223a3 and the inner ring portion of the riveted forming portion 223b extend close to the inner and outer sides of the peripheral portion 212, respectively, and are clamped on the inner and outer sides of the peripheral portion 212 by the insulating sealing structure 23, respectively.

[0358] For example, combined with Figure 13 The inner ring portion 223a3 is clamped on one side of the inner and outer sides of the peripheral portion 212 by the sealing structure 231, and the inner ring portion of the riveted forming portion 223b is clamped on the other side of the inner and outer sides of the peripheral portion 212 by the first insulating member 232. Figure 14 The inner ring portion of the inner ring part 223a3 is clamped on one side of the inner side and the outer side of the peripheral portion 212 by the first insulating member 232, and the inner ring portion of the riveted forming portion 223b is clamped on the other side of the inner side and the outer side of the peripheral portion 212 by the sealing structure 231.

[0359] Please refer to Figure 15 and Figure 16 , Figure 16A cross-sectional view of a pole component provided in some embodiments of the present application; in some embodiments of the present application, the preformed portion 223a includes an outer ring portion 223a2 and a bent portion 223a4. The outer ring portion 223a2 is connected to the first shell wall 111 (e.g., welded) and is disposed around the riveted portion 223b and the bent portion 223a4. The bent portion 223a4 and the riveted portion 223b are respectively clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the insulating sealing structure 23, and the bent portion 223a4 is bent and connected between the riveted portion 223b and the outer ring portion 223a2. As a result, the wall thickness and support capacity of the riveted portion 223b and the bent portion 223a4 are easily guaranteed, which can effectively achieve a tight sealing effect.

[0360] Exemplarily, the pre-formed portion 223a includes an outer ring portion 223a2 and a bent portion 223a4, the outer ring portion of the outer ring portion 223a2 is connected to the first shell wall 111, the bent portion 223a4 is connected between the outer ring portion 223a2 and the riveted forming portion 223b, and the bent portion 223a4 extends from the inner ring portion of the outer ring portion 223a2 in the direction close to the peripheral portion 212, then turns back in the direction close to the outer ring portion 223a2, and extends to be connected to the fixed end 223b1 of the riveted forming portion 223b.

[0361] For example, combined with Figure 15 The inner ring portion of the bent portion 223a4 and the inner ring portion of the riveted forming portion 223b are respectively clamped on the inner side and the outer side of the peripheral portion 212 by the sealing structure 231. Figure 16 The inner ring portion of the bent portion 223a4 is clamped on one side of the inner and outer sides of the peripheral portion 212 by the sealing structure 231, and the inner ring portion of the riveted forming portion 223b is clamped on the other side of the inner and outer sides of the peripheral portion 212 by the first insulating member 232.

[0362] Please refer again Figure 13 、 Figure 14 、 Figure 15 and Figure 16 For example, at least a portion of the sealing structure 231 is clamped between the third adapter ring 223 and the side of the peripheral portion 212 close to the electrode component 3. Thus, sealing can be performed from the side of the peripheral portion 212 close to the accommodating cavity 13, which can more effectively prevent electrolyte leakage from the mating position between the electrode body 21 and the adapter structure 22, thereby improving the sealing effect.

[0363] Exemplarily, the sealing structure 231 includes an axial side portion 231a located on one side of the peripheral portion 212 close to the electrode component 3 and clamped between the peripheral portion 212 and the first extension portion 2231 or the second extension portion 2232 in the inward and outward directions, thereby achieving an axial sealing effect.

[0364] For example, please refer to Figure 14 The third adapter ring 223 is an integrally formed metal ring, and is welded to the first housing wall 111. Thus, the third adapter ring 223 has a simple structure, can construct an integrally arranged first extension portion 2231 and second extension portion 2232, and has good structural strength, and is suitable for connection to the metal first housing wall 111.

[0365] Please refer to Figure 14 Exemplarily, the adapter structure 22 further includes a second insulating frame 225, which is connected to the side of the third adapter ring 223 near the electrode component 3. Thus, the second insulating frame 225 can be used to insulate between the electrode component 3 and the third adapter ring 223, eliminating the need for an insulating sealing structure. Exemplarily, the second insulating frame 225 has a latch, and the third adapter ring 223 has a socket. The latch is inserted into the socket through an interference fit to achieve the connection between the second insulating frame 225 and the third adapter ring 223.

[0366] Please refer to Figure 17 , Figure 17 A decomposition diagram of the processing process of the third adapter ring 223 provided for some embodiments of the present application; illustratively, when the adapter structure 22 includes the third adapter ring 223, and the third adapter ring 223 has an inner extension portion 2231 and an outer extension portion 2232, the steps of shaping the adapter structure 22 may be: first providing a metal plate, then punching a bulge out of the metal plate, then thinning the periphery outside the bulge to obtain one of the inner extension portion 2231 and the outer extension portion 2232, and then punching a hole at the position of the bulge to obtain the other of the inner extension portion 2231 and the outer extension portion 2232.

[0367] Please refer to Figure 18 , Figure 18 Exploded view of the processing process of the pole component provided in some embodiments of the present application; For example, when the third adapter ring 223 is used to make the pole component 2, the third adapter ring 223 is first made, for example, Figure 17In the manner shown, the third adapter ring 223 is then injection-molded to the pole body 21 to obtain the first insulating member 232. The sealing structure 231 is then assembled. Then, through a riveting process, the inner extension 2231 is pressed against the sealing structure 231. Finally, the second insulating frame 225 is assembled onto the third adapter ring 223. Thus, by shaping the third adapter ring 223, the peripheral portion 212 and the inner extension 2231 of the adapter structure 22 are clamped to the sealing structure 231.

[0368] Please refer again Figure 10 In some embodiments of the present application, the sealing structure 231 includes a first portion 2311, which is provided on the side of the peripheral portion 212 close to the electrode component 3 and is clamped between the peripheral portion 212 and the transition structure 22 along the inner and outer directions of the first shell wall 111 (e.g., the fifth direction F5). That is, the axial side portion 231a includes the first portion 2311, the peripheral portion 212 is clamped on the outer side of the first portion 2311 (i.e., the side away from the electrode component 3), and the transition structure 22 is clamped on the inner side of the first portion 2311 (i.e., the side close to the accommodating cavity 13). In this way, sealing can be performed from the side of the peripheral portion 211 close to the accommodating cavity 13, which can more effectively suppress leakage of electrolyte from the mating position of the pole body 21 and the transition structure 22, thereby improving the sealing effect.

[0369] Please refer again Figure 10 and Figure 13 Exemplarily, the pole body 21 includes a main body portion 213, and the peripheral portion 212 is arranged around the main body portion 213. The main body portion 213 protrudes relative to the peripheral portion 212 toward the direction close to the electrode component 3 (that is, close to the inside, or the direction close to the electrode component 3). The sealing structure 231 also includes a second part 2312, which is connected to one end of the first part 2311 close to the main body portion 213 (that is, the inner ring portion of the first part 2311), and extends relative to the first part toward the direction close to the electrode component 3 (that is, close to the inside, or the direction close to the electrode component 3), so that the second part 2312 is spaced between the outer peripheral surface of the main body portion 213 and the transition structure 22.

[0370] Therefore, since the main body 213 of the pole body 21 protrudes relative to the peripheral portion 212 toward the direction close to the electrode component 3 (i.e., close to the inside, or in other words, close to the electrode component 3), it is beneficial to reduce the space occupied by the pole body 21 outside the shell component 1, and reduce the battery cell 102 in the direction of setting the pole component 2 (e.g., Figure 3 Furthermore, by configuring the sealing structure 231 to further include a second portion 2312 spaced between the outer circumference of the main body 213 and the transition structure 22, insulation at this position can be achieved simply and effectively.

[0371] Please refer again Figure 13 Exemplarily, the sealing structure 231 also includes a third part 2313, which is connected to the end of the first part 2311 that is away from the pole body 21 (that is, the outer ring part of the first part 2311), and extends to the outer peripheral area of ​​the peripheral part 212 relative to the first part 2311 in the direction away from the electrode component 3 (that is, close to the outside, or in the direction away from the electrode component 3), and is sealed between the outer peripheral surface of the peripheral part 212 and the transition structure 22.

[0372] Therefore, by setting the sealing structure 231 to also include a third part 2313 that is sealed between the outer peripheral surface of the peripheral portion 212 and the transition structure 22, the sealing performance of the matching position between the pole body 21 and the transition structure 22 can be further improved, thereby improving the sealing effect of the battery cell 102.

[0373] Illustratively, the sealing structure 231 is an integrally formed part, which is convenient for processing and manufacturing, and when the sealing structure 231 includes multiple parts, the connection between the multiple parts is more reliable.

[0374] Please refer again Figure 10 In some embodiments of the present application, the adapter structure 22 has a second annular groove 226 that matches the shape of the sealing structure 231, and the sealing structure 231 is embedded in the second annular groove 226. That is, the shape of the second annular groove 226 matches the shape of the corresponding portion of the sealing structure 231, and at least a portion of the sealing structure 231 is sunken into the second annular groove 226. For example, the thickness of the sunken portion can be equal to, slightly larger than, or slightly smaller than the groove depth of the second annular groove 226. Therefore, the provision of the second annular groove 226 can play a role in positioning the sealing structure 231, thereby improving the assembly efficiency and installation reliability of the sealing structure 231.

[0375] For example, combined with Figure 10 , the second annular groove 226 can be a local thinning area of ​​the transition structure 22. For example, in combination Figure 11 , the second annular groove 226 can also be a step surface formed by the partial bending of the adapter structure 22. When the sealing structure 231 includes a first portion 2311 located on the side of the peripheral portion 212 close to the electrode component 3 and clamped between the peripheral portion 212 and the adapter structure 22 in the inward and outward directions, the portion of the adapter structure 22 (such as the first adapter ring 221 or the third adapter ring 223) located on the side of the first portion 2311 close to the electrode component 3 is bent toward the direction close to the electrode component 3 to form a sunken step surface to construct the second annular groove 226, which is beneficial to reduce the space occupied by the pole body 21 on the outside of the shell component 1 and reduce the battery cell 102 in the direction of setting the pole component 2 (for example Figure 3 The dimensions in the first direction F1) shown in FIG.

[0376] Please refer to Figure 19 and Figure 20 , Figure 19 A partial cross-sectional view of a battery cell provided in some embodiments of the present application; Figure 20 for Figure 19 , in the schematic diagram of the pole component shown in , in some embodiments of the present application, the transition structure 22 includes a mating ring portion 2271, the pole body 21 includes a penetration portion 214 penetrated by the mating ring portion 2271, and a first limiting portion 215 and a second limiting portion 216 connected to the penetration portion 214 and clamped on both sides of the mating ring portion 2271, and the sealing structure 231 extends along the circumference of the mating ring portion 2271 and is clamped between the mating ring portion 2271 and the pole body 21.

[0377] Exemplarily, one of the first limiting portion 215 and the second limiting portion 216 is clamped on the side of the mating ring portion 2271 facing away from the electrode component 3 (i.e., clamped on the outside of the mating ring portion 2271), and the other is clamped on the side of the mating ring portion 2271 close to the electrode component 3 (i.e., clamped on the inside of the mating ring portion 2271). Exemplarily, the sealing structure 231 includes a shaft side portion 231a, for example, the shaft side portion 231a is clamped between the mating ring portion 2271 and the first limiting portion 215 along the inner and outer directions, and for another example, the shaft side portion 231a is clamped between the mating ring portion 2271 and the second limiting portion 216 along the inner and outer directions, and for another example, the shaft side portion 231a is clamped between the mating ring portion 2271 and the second limiting portion 216 along the inner and outer directions, and at the same time, the shaft side portion 231a is also clamped between the mating ring portion 2271 and the first limiting portion 215 along the inner and outer directions.

[0378] In the above technical solution, the pole component 2 has a simple structure and is easy to process, which can simply and effectively achieve relative fixation and insulation between the pole body 21 and the adapter structure 22. The sealing structure 231 is clamped by the mating position between the pole body 21 and the mating ring portion 2271, so that the sealing structure 231 can be positioned at the mating position between the adapter structure 22 and the pole body 21. This facilitates sealing the mating position between the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal. It also helps to reduce the size of the sealing structure 231, reduce the sealing area, facilitate compression sealing, and reduce the seal failure, thereby improving the sealing effect.

[0379] Please refer again Figure 19 and Figure 20Exemplarily, at least a portion of the sealing structure 231 is disposed on a side of the matching ring portion 2271 close to or away from the electrode component 3, so as to be clamped between at least one of the first limiting portion 215 and the second limiting portion 216 and the matching ring portion 2271. That is, the sealing structure 231 includes a shaft side portion 231a, which is disposed on a side of the matching ring portion 2271 close to or away from the electrode component 3, so as to be clamped between at least one of the first limiting portion 215 and the second limiting portion 216 and the matching ring portion 2271.

[0380] For example, refer to Figure 19 and Figure 20 When the first limiting portion 215 is clamped on the side of the mating ring portion 2271 close to the electrode component 3 (i.e., the inner side), and the second limiting portion 216 is clamped on the side of the mating ring portion 2271 away from the electrode component 3 (i.e., the outer side), the shaft side portion 231a can be arranged on the side of the mating ring portion 2271 close to the electrode component 3, the mating ring portion 2271 is clamped on the outer side of the shaft side portion 231a (i.e., the side away from the electrode component 3), and the inner side of the shaft side portion 231a (i.e., the side close to the accommodating cavity 13) is clamped by the first limiting portion 215, so that the shaft side portion 231a is clamped between the mating ring portion 2271 and the first limiting portion 215 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5).

[0381] Alternatively, for example, when the first limiting portion 215 is clamped on the side of the mating ring portion 2271 close to the electrode component 3 (i.e., the inner side), and the second limiting portion 216 is clamped on the side of the mating ring portion 2271 away from the electrode component 3 (i.e., the outer side), the shaft side portion 231a can be arranged on the side of the mating ring portion 2271 away from the electrode component 3, the mating ring portion 2271 is clamped on the inner side of the shaft side portion 231a (i.e., the side close to the accommodating cavity 13), and the outer side of the shaft side portion 231a (i.e., the side away from the electrode component 3) is clamped by the second limiting portion 216, so that the shaft side portion 231a is clamped between the mating ring portion 2271 and the second limiting portion 216 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5).

[0382] Alternatively, for example, when the first limiting portion 215 is clamped on the side of the mating ring portion 2271 close to the electrode component 3 (i.e., the inner side), and the second limiting portion 216 is clamped on the side of the mating ring portion 2271 away from the electrode component 3 (i.e., the outer side), the side of the mating ring portion 2271 close to the electrode component 3 (i.e., the inner side) can be provided with an axial side portion 231a, which is clamped between the mating ring portion 2271 and the first limiting portion 215 along the inner and outer directions of the first shell wall 111 (e.g., the fifth direction F5), and the side of the mating ring portion 2271 away from the electrode component 3 (i.e., the outer side) can also be provided with an axial side portion 231a, which is clamped between the mating ring portion 2271 and the second limiting portion 216 along the inner and outer directions of the first shell wall 111 (e.g., the fifth direction F5).

[0383] As a result, a more reliable sealing effect can be achieved between the transition structure 22 and the pole body 21 through axial sealing. If the pole component only includes the pole body, and an axial seal is provided between the pole body and the first shell wall, it is necessary to apply sealing pressure along the axial direction of the mounting hole, which will cause the first shell wall to be subjected to excessive force. However, the embodiment of the present application can reduce the axial force acting on the first shell wall 111 by integrating the axial seal (such as the shaft side portion 231a) into the pole component 2. In addition, when at least a portion of the sealing structure 231 is provided on the side of the mating ring portion 2271 close to the electrode component 3, it can be sealed from the side of the mating ring portion 2271 close to the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking out of the mating position between the pole body 21 and the transition structure 22, thereby improving the sealing effect.

[0384] Please refer again Figure 20 In some embodiments of the present application, the insulating sealing structure 23 also includes a second insulating member 234, the sealing structure member 231 is clamped between one of the first limiting portion 215 and the second limiting portion 216 and the mating ring portion 2271, and the second insulating member 234 is clamped between the other of the first limiting portion 215 and the second limiting portion 216 and the mating ring portion 2271.

[0385] The second insulating member 234 and the sealing structure 231 are respectively clamped on either side of the mating ring portion 2271 along the inward-outward direction (e.g., the fifth direction F5) of the first housing wall 111. When the sealing structure 231 is clamped between the first limiting portion 215 and the mating ring portion 2271, the second insulating member 234 is clamped between the second limiting portion 216 and the mating ring portion 2271. When the sealing structure 231 is clamped between the second limiting portion 216 and the mating ring portion 2271, the second insulating member 234 is clamped between the first limiting portion 215 and the mating ring portion 2271.

[0386] In the above technical solution, since the insulating sealing structure 23 includes a second insulating member 234 and a sealing structure member 231 that are not integrated into one piece, the design and processing of the insulating sealing structure 23 can be simplified. Moreover, according to the specific matching requirements with the pole body 21 and the transition structure 22, the second insulating member 234 can be set to be an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the second insulating member 234 can be set to be a compressible sealing member that has a sealing effect (such as an elastic rubber member), so as to meet different actual requirements. In addition, when the second insulating member 234 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure member 231 and improve the sealing effect.

[0387] Alternatively, please combine Figure 21 , Figure 21 A partial cross-sectional view of a battery cell provided for some embodiments of the present application; in some other embodiments of the present application, the sealing structure 231 can also be an integral structure and surround a mating ring portion 2271, so as to be respectively located on the side of the mating ring portion 2271 close to the electrode component 3 and the side away from the electrode component 3, and the pole body 21 is clamped on both sides of the mating ring portion 2271 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the sealing structure 231.

[0388] That is, the sealing structure 231 is an integral annular structure that provides both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the mating ring portion 2271, respectively. The axial side portions 231a on the inner and outer sides of the mating ring portion 2271 are connected by a circumferential side portion 231b located on the inner circumference of the mating ring portion 2271. In this way, the adapter structure 22 can be clamped by the two axial side portions 231a of the sealing structure 231 on both sides of the mating ring portion 2271 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111. In the above technical solution, because the sealing structure 231 is an integral structure and surrounds the mating ring portion 2271, the number of parts and assembly steps can be reduced.

[0389] In an embodiment of the present application, when the pole body 21 includes a penetration portion 214, and a first limiting portion 215 and a second limiting portion 216 connected to the penetration portion 214 and clamped on both sides of the mating ring portion 2271, the composition of the pole body 21 is not limited, and it can be a single part or a combination of multiple parts (such as two or more).

[0390] For example, please refer again to Figure 20At least a portion of the sealing structure 231 is clamped between the first limiting portion 215 and the mating ring portion 2271. The second limiting portion 216 is assembled and connected to the penetration portion 214 on the side of the mating ring portion 2271 facing away from the first limiting portion 215. In this embodiment, the insulating sealing structure 23 may include or exclude the second insulating member 234. The second limiting portion 216 and the penetration portion 214 may be assembled and connected in any manner, such as welding, punching, or adhesive bonding. Assembled connection refers to the connection of two components through a connection process.

[0391] Thus, the second limiting portion 216 and the penetration portion 214 are provided as separate parts and assembled and connected, which simplifies the structure of the pole body 21 and facilitates assembly and connection with the adapter structure 22. In addition, when the second insulating member 234 is clamped between the second limiting portion 216 and the matching ring portion 227, and the second limiting portion 216 and the penetration portion 214 are welded, the thermal impact on the sealing structure 231 clamped between the first limiting portion 215 and the matching ring portion 227 can be reduced, thereby improving the sealing reliability of the sealing structure 231.

[0392] In the above embodiment, the connection method of the penetration portion 214 and the first limiting portion 215 is not limited, and can be an integral part, or can be a split part and pre-connected together. For example, the end of the penetration portion 214 facing away from the first limiting portion 215 can include a riveted portion 2141. During assembly, the penetration portion 214 can be penetrated along the direction from the first limiting portion 215 to the second limiting portion 216 through the matching ring portion 2271 equipped with the insulating sealing structure 23, and then the riveted portion 2141 is riveted to limit the penetration portion 214 from being disengaged along the direction from the second limiting portion 216 to the first limiting portion 215. After that, the riveted portion 2141 and the second limiting portion 216 can be connected, thereby facilitating the connection between the penetration portion 214 and the second limiting portion 216, such as welding. Alternatively, the riveted portion 2141 can be omitted, thereby eliminating the riveting process after the penetration portion 214 is penetrated.

[0393] For example, please combine Figure 21 、 Figure 22 and Figure 23 , Figure 22 An exploded view of a pole component provided in some embodiments of the present application; Figure 23 for Figure 22 ; in some other embodiments of the present application, at least a portion of the sealing structure 231 is clamped between the first limiting portion 215 and the mating ring portion 2271, the second limiting portion 216 and the penetration portion 214 are integrally formed, and the second limiting portion 216 rivets the insulating sealing structure 23 against the mating ring portion 2271. In this embodiment, the insulating sealing structure 23 may include a second insulating member 234 or may not include the second insulating member 234.

[0394] In the above technical solution, the assembly connection between the second limiting portion 216 and the insulating sealing structure 23 is achieved through riveting, which reduces the thermal impact of the heat generated when the second limiting portion 216 is connected to the insulating sealing structure 23 on the sealing structure 231 clamped between the first limiting portion 215 and the mating ring portion 2271, thereby improving the sealing reliability of the sealing structure 231. In addition, when the second insulating member 234 is clamped between the second limiting portion 216 and the mating ring portion 2271, the riveting of the second limiting portion 216 makes it easier to control the compression of the sealing structure 231, achieving a better compression effect.

[0395] In the above embodiment, the connection method between the penetration portion 214 and the first limiting portion 215 is not limited. They can be a single piece, or they can be separate pieces that are pre-connected. For example, during assembly, the penetration portion 214 can be passed through the matching ring portion 2271 equipped with the insulating sealing structure 23 along the direction from the first limiting portion 215 to the second limiting portion 216, and then the second limiting portion 216 can be riveted to limit the relative movement between the pole component 21 and the adapter structure 22.

[0396] When the sealing structure 231 is an integral structure and is surrounded by a mating ring portion 2271, so as to be respectively located on the side of the mating ring portion 2271 close to the electrode component 3 and the side away from the electrode component 3, and the pole body 21 is clamped on both sides of the mating ring portion 2271 along the inward and outward directions by the sealing structure 231, the pole body 21 can be in the form of the above-mentioned split connection or in the form of the above-mentioned integral and riveted connection, which will not be elaborated here.

[0397] For example, please refer to Figure 21 The pole body 21 includes a first pole member 21a and a second pole member 21b. The second pole member 21b is composed of a penetration portion 214, a first limiting portion 215, and a second limiting portion 216, and is mounted on the first shell wall 111. The penetration portion 214 surrounds a mating hole 21b1 that penetrates along the inward and outward directions of the first shell wall 111. The first pole member 21a is assembled on the side of the second pole member 21b that faces away from the electrode component 3 and covers the mating hole 21b1. A portion of the conductive portion 4 can extend into the mating hole 21b1 and connect to the first pole member 21a. As a result, the pole body 21 can accommodate the conductive portion 4, thereby reducing the space occupied by the conductive portion 4 in the accommodating cavity 13, which is beneficial for improving the energy density of the battery cell 102.

[0398] Please refer again Figure 19 and Figure 20In some embodiments of the present application, the first limiting portion 215 is clamped on the side of the mating ring portion 2271 close to the electrode component 3, and the sealing structure 231 includes a fifth portion 2315 clamped between the mating ring portion 2271 and the first limiting portion 215. That is, the shaft side portion 231a includes the fifth portion 2315, the mating ring portion 2271 is clamped on the outside of the fifth portion 2315 (i.e., the side away from the electrode component 3), and the first limiting portion 215 is clamped on the inside of the fifth portion 2315 (i.e., the side close to the accommodating cavity 13). In this way, sealing can be performed from the side of the mating ring portion 2271 close to the interior of the shell component 1, which can more effectively suppress the leakage of electrolyte from the mating position between the pole body 21 and the transition structure 22, thereby improving the sealing effect.

[0399] Please refer again Figure 19 and Figure 20 Exemplarily, the sealing structure 231 also includes a sixth part 2316, which is connected to the end of the fifth part 2315 close to the pole body 21 (i.e., the inner ring part of the fifth part 2315), and extends relative to the fifth part 2315 in a direction away from the electrode component 3 (i.e., close to the outside, or in a direction away from the electrode component 3), so as to be spaced between the outer peripheral surface of the penetration portion 214 and the inner peripheral surface of the mating ring portion 2271.

[0400] In the above technical solution, by configuring the sealing structure 231 to further include a sixth portion 2316 spaced between the outer circumference of the penetration portion 214 and the inner circumference of the matching ring portion 2271 , insulation of this position can be achieved simply and effectively.

[0401] Please refer to Figure 22 and Figure 23 In some embodiments of the present application, the adapter structure 22 includes a fourth adapter ring 227, which includes a mating ring portion 2271. The fourth adapter ring 227 is connected to the first shell wall 111, for example, the outer ring portion of the fourth adapter ring 227 is connected to the first shell wall 111. The fourth adapter ring 227 and the first shell wall 111 can be connected in any manner, such as welding, riveting, punching, bonding, etc.

[0402] Exemplarily, the fourth adapter ring 227 and the first shell wall 111 are both made of aluminum and are welded together, which helps to improve the welding yield.

[0403] For example, please refer to Figure 22 and Figure 23The fourth adapter ring 227 may include a main body ring portion 2272 and a mating ring portion 2271. The main body ring portion 2272 is disposed around the mating ring portion 2271. The mating ring portion 2271 is raised relative to the main body ring portion 2272 in a direction away from the electrode component 3, thereby forming a third annular groove 2273 on the side of the mating ring portion 2271 near the electrode component 3. The sealing structure 231 is engaged with the third annular groove 2273. For example, when the fourth adapter ring 227 is connected to the first shell wall 111, the outer ring portion of the main body ring portion 2272 may be connected to the first shell wall 111.

[0404] Thus, because the main ring portion 2272 of the fourth adapter ring 227 protrudes relative to the mating ring portion 2271 in the direction closer to the electrode component 3 (i.e., closer to the inside, or closer to the electrode component 3), it is beneficial to reduce the space occupied by the pole body 21 inside the shell component 1. In addition, the bending of the fourth adapter ring 227 can form a third annular groove 2273, so that at least a portion of the sealing structure 231 is sunk into the third annular groove 2273. For example, the thickness of the sunken portion can be equal to the groove depth of the third annular groove 2273, or slightly larger or smaller. Therefore, by providing the third annular groove 2273, it can play a role in positioning the sealing structure 231, thereby facilitating the improvement of the assembly efficiency and installation reliability of the sealing structure 231.

[0405] Please refer again Figure 22 and Figure 23 Exemplarily, the sealing structure 231 also includes a seventh part 2317, which is connected to the end of the fifth part 2315 that is away from the pole body 21 (that is, the outer ring part of the fifth part 2315), and extends relative to the fifth part 2315 toward the direction close to the electrode component 3 (that is, close to the inside, or close to the accommodating cavity 13) to seal between the outer peripheral surface of the first limiting portion 215 and the inner peripheral surface of the main body ring portion 2272.

[0406] Therefore, by setting the sealing structure 231 to also include a seventh part 2317 that seals between the first limiting portion 215 and the main body ring portion 2272, the sealing performance of the matching position between the pole body 21 and the transition structure 22 can be further improved, thereby improving the sealing effect of the battery cell 102.

[0407] Please refer again Figure 21 and Figure 20In some embodiments of the present application, the adapter structure 22 further includes a fourth adapter ring 227. The fourth adapter ring 227 is a metal ring and includes a mating ring portion 2271. The fourth adapter ring 227 is welded to the first shell wall 111. Thus, the adapter structure 22 has good structural strength and is suitable for connection to the metal first shell wall 111. In this embodiment, the fourth adapter ring 227 may include a main body ring portion 2272 that is bent and connected to the mating ring portion 2271, or it may not include the main body ring portion 2272 that is bent and connected to the mating ring portion 2271.

[0408] Please refer again Figure 20 Exemplarily, the adapter structure 22 further includes a third insulating frame 228, which is connected to the side of the fourth adapter ring 227 near the electrode component 3. Thus, the third insulating frame 228 can be used to insulate between the electrode component 3 and the fourth adapter ring 227, eliminating the need for an insulating sealing structure. Exemplarily, the third insulating frame 228 has a latch, and the fourth adapter ring 227 has a socket. The latch is interference-fitted into the socket to achieve the connection between the third insulating frame 228 and the fourth adapter ring 227.

[0409] In some embodiments of this application, please refer to Figure 6 and Figure 7 , the transition structure 22 is formed into a long strip (such as a rectangle, an ellipse, a racetrack, etc.) extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the transition structure 22 (such as a rectangle, an ellipse, a racetrack, etc.). As mentioned above, the electrode component 3 is connected to the pole component 2 through the conductive part 4. When the contour shape of the pole body 21 is formed into a long strip that matches the contour shape of the transition structure 22, the area of ​​the pole body 21 is larger, which is conducive to increasing the connection area between the conductive part 4 and the pole body 21, thereby improving the charging performance. "Racetrack shape" is an oblong circle, in which the oblong circle can be roughly considered to be composed of a rectangle and two semicircles. The contour shape of the oblong circle can be roughly considered to be the contour shape of the rectangle after the two short sides of the rectangle are replaced by two arcs.

[0410] In some other embodiments of this application, please refer to Figures 8-10 The transition structure 22 is formed into an elongated strip (e.g., rectangular, oval, or racetrack-shaped) extending along the length of the first shell wall 111. The pole body 21 is located at the center of the length of the transition structure 22 and has a circular shape. This ensures uniform force at the connection between the transition structure 22 and the pole body 21, making it easier to control the compression of the insulating sealing structure 23, thereby improving the reliability of the sealing fit between the two. Furthermore, the sealing area is relatively small, making it less susceptible to failure.

[0411] In some embodiments of the present application, Figure 24 , Figure 24 This is a cross-sectional view of a pole component provided in some embodiments of the present application; the portion of the inner end surface 220 of the transition structure 22 adjacent to the pole body 21 forms a surrounding region 2201 surrounding the pole body 21. That is, the area of ​​the inner end surface 220 of the transition structure 22 closest to the pole body 21 is the surrounding region 2201. The inner end surface 211 of the pole body 21 (i.e., the surface of the pole body 21 adjacent to the active material coating portion 32) protrudes from the surrounding region 2201 toward the electrode component 3 (i.e., toward the active material coating portion 32). In short, the inner end surface 211 of the pole body 21 protrudes inward from the surrounding region 2201 of the inner end surface 220 of the transition structure 22.

[0412] The "inner end surface 211 of the pole body 21" refers to the surface of the pole body 21 on the side close to the electrode component 3 (i.e., close to the active material coating portion 32), and the "inner end surface 220 of the transition structure 22" refers to the surface of the transition structure 22 on the side close to the electrode component 3 (i.e., close to the active material coating portion 32). The "inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction close to the electrode component 3" means that the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction close to the active material coating portion 32. The inner end surface 220 of the transition structure 22 can be a planar structure or a non-planar structure.

[0413] Thus, by setting the inner end surface 211 of the pole body 21 to protrude from the surrounding area 2201 toward the direction close to the electrode component 3, when the height of the pole body 21 is constant, it is equivalent to retracting the pole body 21 toward the direction of the accommodating cavity 13, so as to reduce the space occupied by the pole component 2 outside the shell component 1, and reduce the battery cell 102 in the direction of setting the pole component 2 (for example Figure 3 The dimensions in the first direction F1) shown in FIG.

[0414] In some embodiments of the present application, Figure 24 When the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 toward the direction close to the electrode component 3, ... Figure 6If the adapter structure 22 is configured as an elongated strip (e.g., rectangular, elliptical, or racetrack-shaped) extending along the length of the first shell wall 111, the contour of the pole body 21 matches the contour of the adapter structure 22 (e.g., rectangular, elliptical, or racetrack-shaped). Thus, the inner end surface 211 of the pole body 21 is relatively large, which facilitates laying the pole connection portion of the conductive portion 4 (e.g., the gathered portion 313 of the pole ear portion 33 described herein, or the second connection segment 412 or the first conductive segment 415 of the conductive member 41) flat on the inner end surface 211 of the pole body 21 (e.g., when the pole connection portion is also elongated), thereby increasing the connection area between the conductive portion 4 and the pole body 21, thereby improving charging performance.

[0415] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be a relatively hard plate-shaped portion that will not bend downward under the action of gravity, such as the retracted portion 313 of the pole ear portion 33 described in this article (such as an ultrasonic weld mark), 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.

[0416] In some embodiments of the present application, Figure 25 , Figure 25 A partial cross-sectional view of a battery cell provided in some embodiments of the present application; when the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 toward the direction close to the electrode component 3, combined with Figure 8 If the transition structure 22 is set to be a long strip extending along the length direction of the first shell wall 111, the pole body 21 is set in the center of the transition structure 22 and has a circular outline. In this way, the inner end surface 211 of the pole body 21 is relatively small. For example, it can be combined with Figure 25 The conductive portion 4 is configured to include a pole ear portion 33 and a conductive member 41 connected to the pole ear portion 33. The conductive member 41 includes a first conductive segment 415 laid on the inner end surface 211 of the pole body 21, and a second conductive segment 416 staggered from the inner end surface 211 of the pole body 21. The second conductive segment 416 protrudes relative to the first conductive segment 415 in a direction away from the electrode component 3 (i.e., close to the outside, or in a direction away from the active material coating portion 32). The pole ear portion 33 is connected to the second conductive segment 416.

[0417] Thus, the height difference between the pole body 21 and the adapter structure 22 can be utilized to accommodate the second conductive segment 416 and the tab portion 33 of the conductive member 41, thereby fully utilizing the space, reducing the space occupied by the conductive portion 4 in the accommodating cavity 13, and improving the energy density of the battery cell 102. For example, if the portion connecting the tab portion 33 and the second conductive segment 416 (such as the gathered portion 313 described herein) is elongated, the second conductive segment 416 can also be configured as an elongated strip, while the first conductive segment 415 can be configured as a circular shape that matches the shape of the pole body 21 to meet the connection requirements.

[0418] When the conductive portion 4 includes a first conductive segment 415 and a second conductive segment 416 , in order to ensure that the second conductive segment 416 protrudes relative to the first conductive segment 415 in a direction away from the electrode component 3 , the conductive portion 4 can be processed from a material with a certain hardness and thickness. For example, the conductive portion 4 can be a metal sheet.

[0419] In some embodiments of the present application, Figure 26 , Figure 26 A cross-sectional view of a pole component provided in some embodiments of the present application; the position of the inner end face 220 of the transition structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, that is, the circle of the inner end face 220 of the transition structure 22 closest to the pole body 21 is the surrounding area 2201, and the surrounding area 2201 is flush with the inner end face 211 of the pole body 21 (that is, the side surface of the pole body 21 close to the active material coating portion 32). At this time, when the inner end surface 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is configured as a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is arranged in the center of the adapter structure 22 and has a circular outline), a portion of the pole connection portion of the conductive part 4 (for example, the retracted portion 313 of the pole ear portion 33 described in this article, or the second connection segment 412 or the first conductive segment 415 of the conductive member 41) can be laid flat on the inner end surface 211 of the pole body 21, and the remaining portion can be laid flat on the surrounding area 2201 (for example, the case where the pole connection portion is also a long strip), so that the pole connection portion of the conductive part 4 can be supported as a whole, which is convenient for the pressing of the welding nozzle, so that the conductive part 4 can be reliably connected to the pole body 21.

[0420] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be a relatively hard plate-shaped portion that will not bend downward under the action of gravity, such as the retracted portion 313 of the pole ear portion 33 described in this article (such as an ultrasonic weld mark), 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.

[0421] In addition, when the surrounding area 2201 is 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 transition structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the transition structure 22).

[0422] For example, in combination Figure 26 When the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, the inner end surface 220 of the transition structure 22 can be formed into a plane, thereby facilitating the processing of the transition structure 22. Alternatively, for example, Figure 27 and Figure 28 , Figure 27 This is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application. Figure 28 for Figure 27 Cross-sectional view along line BB; when the inner end surface 220 of the adapter structure 22 includes a surrounding area 2201, and the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, the adapter structure 22 can be configured so that the portion surrounding the pole body 21 protrudes in a direction away from the electrode component 3, so that the inner end surface 220 of the adapter structure 22 defines a first groove 511 that is open in a direction close to the electrode component 3. As a result, the first groove 511 can be used to accommodate at least a portion of the conductive portion 4, thereby reducing the space occupied by the conductive portion 4 in the accommodating cavity 13 and improving the energy density of the battery cell 102.

[0423] In some embodiments of this application, please refer to Figure 5 The pole component 2 defines a receiving groove 5 that is recessed relative to the first shell wall 111 in a direction away from the electrode component 3 and open toward the electrode component 3. The electrode component 3 is connected to the pole component 2 via the conductive portion 4. At least a portion of the conductive portion 4 is accommodated in the receiving groove 5 and connected to the pole body 21. In other words, the pole component 2 defines a receiving groove 5, the groove wall of which is formed by the pole component 2. The receiving groove 5 is recessed in a direction away from the active material coating portion 32 and open toward the active material coating portion 32, so that the receiving groove 5 is in communication with the accommodating cavity 13.

[0424] Thus, by providing the receiving groove 5 to accommodate the conductive portion 4, the space occupied by the conductive portion 4 in the receiving chamber 13 can be reduced, leaving the receiving chamber 13 with more space to accommodate the active material coating portion 32, thereby increasing the volume of the active material coating portion 32 and thereby increasing the energy density of the battery cell 102. Furthermore, because the receiving groove 5 is open toward the electrode component 13, the conductive portion 4 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0425] For example, please refer again to Figure 5The accommodating groove 5 is formed on the side of the pole body 21 and the transition structure 22 facing the electrode component 3 (i.e., the side facing the active material coating portion 32), and the transition structure 22 is raised relative to the first shell wall 111 in the direction away from the electrode component 3 (i.e., the direction away from the active material coating portion 32), so that the accommodating groove 5 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3.

[0426] Therefore, by processing the adapter structure 22 into an outwardly protruding bulge, a part of the accommodating groove 5 is formed on the side of the pole body 21 facing the electrode component 3, and another part of the accommodating groove 5 is formed on the side of the adapter structure 22 facing the electrode component 3, and the accommodating groove 5 is in a shape that is concave relative to the first shell wall 111 in the direction away from the electrode component 3, so that the side of the pole body 21 facing the electrode component 3 and the side of the adapter structure 22 facing the electrode component 3 both have a space accommodating groove conductive part 4. In this way, it is not only convenient to accommodate the conductive part 4 to a greater extent, but also conducive to the design of diverse forms of the conductive part 4.

[0427] In other embodiments of the present application, Figure 14 When the transition structure 22 does not bulge in the direction away from the electrode component 3 (i.e., away from the active material coating portion 32) relative to the first shell wall 111, the height difference between the transition structure 22 and the pole body 21 can also be used to define a receiving groove 5 that is recessed in the direction away from the electrode component 3 relative to the first shell wall 111.

[0428] In some embodiments of this application, please refer to Figure 5 , the surface of the end of the pole body 21 facing the electrode component 3 is the inner end surface 211 of the pole body 21, the inner end surface 211 of the pole body 21 participates in forming the accommodating groove 5, and the conductive portion 4 is connected to the inner end surface 211 of the pole body 21. That is, at least a portion of the inner end surface 211 of the pole body 21 participates in defining the groove wall of the accommodating groove 5, and the conductive portion 4 is connected to the portion of the inner end surface 211 of the pole body 21 that serves as the groove wall of the accommodating groove 5. In the above technical solution, at least a portion of the accommodating groove 5 is surrounded by the surface of the side of the pole body 21 facing the electrode component 3, and the conductive portion 4 received in the accommodating groove 5 can be easily contacted and connected to the pole body 21, thereby improving the connection convenience and simplifying the structure.

[0429] For example, when at least a portion of the conductive portion 4 is accommodated in the accommodating groove 5, the pole connecting portion of the conductive portion 4 (e.g., the pole ear portion 33 or the conductive member 41) (e.g., the gathered portion 313 of the pole ear portion 33 described herein, or the second connecting segment 412 or the first conductive segment 415 of the conductive member 41) can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21. During processing, the pole connecting portion of the conductive portion 4 can first be installed in the accommodating groove 5, and then the pole connecting portion can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21.

[0430] The configuration of the receiving groove 5 is not limited and can be flexibly designed and constructed.

[0431] Please combine again Figures 8-10 For example, the adapter structure 22 is configured to be convex relative to the first shell wall 111 in a direction away from the electrode component 3, so that the adapter structure 22 encloses a first groove 511 that is recessed in a direction away from the electrode component 3, and the receiving groove 5 includes the first groove 511. Therefore, by processing the adapter structure 22 into an outwardly protruding convex shape, the first groove 511 can be enclosed by the adapter structure 22, and the first groove 511 is easy to process. In this embodiment, the configuration of the adapter structure 22 is not limited, and for example, it can be a combination of the first adapter ring 221 and the second adapter ring 222, or the third adapter ring 223, or the fourth adapter ring 227, etc.

[0432] It is worth noting that, since the adapter structure 22 needs to surround the pole body 21, the adapter structure 22 has a central annular hole, and the portion of the first groove 511 opposite to the central annular hole may be partially occupied by the pole body 21 (for example, the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 toward the electrode component 3), or may not be occupied by the pole body 21 (for example, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is the surrounding area 2201 surrounding the pole body 21, combined with the inner end surface 220 of the adapter structure 22). Figure 29 The surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, or, combined with Figure 29 The surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 toward the electrode component 3)

[0433] For example, the adapter structure 22 (eg, the first adapter ring 221 , the third adapter ring 223 , or the fourth adapter ring 227 ) can be configured by a stamping process to be bulged relative to the first shell wall 111 in a direction away from the electrode component 3 .

[0434] Please combine again Figure 14For example, the transition structure 22 includes a surrounding portion 22a1 located on the side of the pole body 21 close to the electrode component 3, the surrounding portion 22a1 and the pole body 21 form a second groove 512 that is recessed in the direction away from the electrode component 3, the conductive portion 4 is connected to the pole body 21 through the second groove 512, and the accommodating groove 5 includes the second groove 512.

[0435] That is, the inner end surface 211 of the pole body 21 is positioned further away from the electrode component 3 than the surrounding portion 22a1, so that the accommodating groove 5 includes a second groove 512 formed between the pole body 21 and the surrounding portion 22a1 of the adapter structure 22. Thus, by providing a step between the pole body 21 and the surrounding portion 22a1, the second groove 512 is naturally formed by the relative positions of the pole body 21 and the adapter structure 22, making it easy to obtain the second groove 512. In this embodiment, the configuration of the adapter structure 22 is not limited; for example, it can be a combination of the first adapter ring 221 and the second adapter ring 222, or the third adapter ring 223.

[0436] In some embodiments of the present application, Figure 29 The adapter structure 22 protrudes relative to the first shell wall 111 in a direction away from the electrode component 3 to form a first groove 511. Simultaneously, the adapter structure 22 includes a surrounding portion 22a1 located on the side of the pole body 21 near the electrode component 3. The surrounding portion 22a1 and the pole body 21 enclose a second groove 512 that is recessed in a direction away from the electrode component 3. The second groove 512 communicates with the side of the first groove 511 that is away from the electrode component 3. The accommodating groove 5 includes a first groove 511 and a second groove 512. The conductive portion 4 is connected to the pole body 21 via the first groove 511 and the second groove 512. This increases the volume of the accommodating groove 5 and further reduces the space occupied by the conductive portion 4 in the accommodating cavity 13.

[0437] Combine Figure 21In some embodiments of the present application, the pole component 2 includes a pole body 21, the conductive portion 4 is connected to the pole body 21, and the pole body 21 includes a first pole member 21a and a second pole member 21b. The second pole member 21b is connected to the adapter structure 22 and defines a mating hole 21b1. The first pole member 21a is assembled on the second pole member 21b and is located on the side of the second pole member 21b facing away from the electrode component 3 and covers the mating hole 21b1. The receiving groove 5 includes a third groove 513 enclosed by the first pole member 21a and the second pole member 21b. Thus, the pole body 21 is configured to be assembled from two parts, thereby defining the third groove 513 and facilitating the formation of the third groove 513. In this embodiment, the configuration of the adapter structure 22 is not limited and can, for example, be a combination of the first adapter ring 221 and the second adapter ring 222, the third adapter ring 223, or the fourth adapter ring 227.

[0438] In some embodiments of the present application, the adapter structure 22 is raised relative to the first shell wall 111 in a direction away from the electrode component 3 to form a first groove 511. Simultaneously, the pole body 21 is formed by the first pole member 21a and the second pole member 21b to form a third groove 513 that is recessed in a direction away from the electrode component 3. The third groove 513 is connected to the side of the first groove 511 that is away from the electrode component 3. The accommodating groove 5 includes the first groove 511 and the third groove 513. The conductive portion 4 is connected to the first pole member 21a via the first groove 511 and the third groove 513. Thus, the volume of the accommodating groove 5 can be increased, further reducing the space occupied by the conductive portion 4 in the accommodating cavity 13.

[0439] Combine Figure 29 , Figure 29 Cross-sectional views of the terminal components provided in some embodiments of the present application; in some embodiments of the present application, the adapter structure 22 includes a connection end 22a connected to the first shell wall 111, and the adapter structure 22 includes a raised portion 22b that protrudes relative to the connection end 22a in a direction away from the terminal component 3 (i.e., away from the active material coating portion 32). The terminal body 21 is mounted on the raised portion 22b. Thus, by providing the raised portion 22b to mount the terminal body 21, the space occupied by the terminal body 21 in the accommodating cavity 13 can be reduced, thereby increasing the energy density of the battery cell 102.

[0440] For example, in combination Figure 29The ridge 22b and the side of the transition structure 22 near the electrode component 3 form a receiving groove 5. The electrode component 3 is connected to the pole component 2 via the conductive portion 4. At least a portion of the conductive portion 4 is received in the receiving groove 5 and connected to the pole body 21. Thus, by providing the ridge 22b and forming the receiving groove 5 on the side of the ridge 22b and the transition structure 22 near the electrode component 3 to receive the conductive portion 4, the space occupied by the conductive portion 4 in the receiving cavity 13 can be reduced, leaving the receiving cavity 13 with more space to accommodate the active material coating portion 32, which is beneficial for increasing the volume of the active material coating portion 32, thereby increasing the energy density of the battery cell 102.

[0441] For example, in combination Figure 29 , a first groove 511 is formed on the side of the raised portion 22b close to the electrode component 3, and at least a portion of the conductive portion 4 is accommodated in the first groove 511. That is, when the adapter structure 22 is raised relative to the first shell wall 111 in a direction away from the electrode component 3 to form the first groove 511, the raised portion 22b can be a raised portion, and the inner side of the raised portion 22b (i.e., the side close to the active material coating portion 32) forms the above-mentioned first groove 511. Therefore, by providing the first groove 511 to accommodate the conductive portion 4, the space occupied by the conductive portion 4 in the accommodating cavity 13 can be reduced, so that the accommodating cavity 13 has a larger space to accommodate the active material coating portion 32, which is conducive to increasing the volume of the active material coating portion 32, thereby increasing the energy density of the battery cell 102.

[0442] In some embodiments of the present application, Figure 24 The transition structure 22 includes a connection end 22a connected to the first shell wall 111, and the transition structure 22 includes a sunken portion 22c that is recessed relative to the connection end 22a toward the direction close to the pole component 3 (i.e., the direction close to the active material coating portion 32). The pole body 21 is installed in the sunken portion 22c. Therefore, when the height of the pole body 21 is constant, it is equivalent to retracting the pole body 21 toward the direction of the accommodating cavity 13 (i.e., the direction close to the active material coating portion 32), which is beneficial to reducing the space occupied by the pole body 21 outside the shell component 1 and reducing the battery cell 102 in the direction of setting the pole component 2 (e.g., Figure 3 The dimensions in the first direction F1) shown in FIG.

[0443] For example, in combination Figure 24 The side surface of the sunken portion 22c close to the electrode component 3 is a surrounding area 2201 surrounding the pole body 21. The inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 toward the electrode component 3, or the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21. This allows for flexible processing to meet various needs.

[0444] For example, referring to the above, by setting the inner end surface 211 of the pole body 21 to protrude from the surrounding area 2201 in the direction close to the electrode component 3, when the height of the pole body 21 is constant, it is equivalent to retracting the pole body 21 in the direction of the accommodating cavity 13, so as to reduce the space occupied by the pole component 2 on the outside of the shell component 1, and reduce the battery cell 102 in the direction of setting the pole component 2 (for example Figure 3 The dimensions in the first direction F1) shown in FIG.

[0445] For example, referring to the above, when the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, if the inner end surface 211 of the pole body 21 is small (for example, the adapter structure 22 is configured as a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is arranged in the center of the adapter structure 22 and has a circular outline), a portion of the pole connection portion of the conductive part 4 (for example, the retracted portion 313 of the pole ear portion 33 described herein, or the second connection segment 412 or the first conductive segment 415 of the conductive member 41) can be laid flat on the inner end surface 211 of the pole body 21, and the remaining portion can be laid flat on the surrounding area 2201 (for example, when the pole connection portion is also in the shape of a long strip), so that the pole connection portion of the conductive part 4 can be supported as a whole, which is convenient for pressing the welding nozzle, so that the conductive part 4 can be reliably connected to the pole body 21.

[0446] Combine Figure 30-Figure 33 , Figure 30 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, in which the terminal component is in a state before being covered by the first shell wall; Figure 31 for Figure 30 FIG . shows a state in which the pole component is covered behind the first shell wall; Figure 32 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, in which the terminal component is in a state before being covered by the first shell wall; Figure 33 for Figure 32 FIG shows a state in which the pole component is covered behind the first housing wall.

[0447] In some embodiments of the present application, the adapter structure 22 includes a connection end 22a connected to the first shell wall 111. One of the connection end 22a and the first shell wall 111 has a fourth annular groove C1 that mates with the other. The fourth annular groove C1 extends along the entire circumference of the mounting hole 112 and opens in a direction away from the electrode component 3 (i.e., toward the outside of the first shell wall 111). The location of the fourth annular groove C1 can be selected based on whether the pole component 2 is mounted on the first shell wall 111 from the outside or from the inside, providing design flexibility.

[0448] Thus, the provision of the fourth annular groove C1 can serve as an assembly positioning function, facilitating the assembly and connection of the pole component 2 with the first shell wall 111. Furthermore, because the fourth annular groove C1 is open near the outside, the adapter structure 22 and the first shell wall 111 can be welded from the outside of the first shell wall 111, which is beneficial to improving the convenience and reliability of the connection between the pole component 2 and the first shell wall 111.

[0449] For example, please refer to Figure 30 and Figure 31 During processing of the battery cell 102, the electrode component 3 and the terminal post component 2 can be connected first, and then the terminal post component 2 and the housing component 1 can be connected. For example, the terminal post component 2 and the electrode component 3 can be connected first, and then placed together on the inner side of the first housing wall 111, and then the terminal post component 2 can be extended from the mounting hole 112 to the outside of the first housing wall 111; or the electrode component 3 can be placed on the inner side of the first housing wall 111 first, and the conductive portion 4 can be extended from the mounting hole 112 to the outside of the first housing wall 111 to connect with the terminal post component 2 pre-installed on the outside of the first housing wall 111. In short, when the terminal post component 2 and the electrode component 3 are connected and the terminal post component 2 is located outside the first housing wall 111, the terminal post component 2 can be installed on the mounting hole 112 of the first housing wall 111 from the outside of the first housing wall 111 (i.e., the side facing away from the active material coating portion 32). At this time, the edge of the terminal post component 2 can be supported on the side of the first housing wall 111 facing away from the electrode component 3. Therefore, since the pole component 2 covers the first shell wall 111 from the outside, the pole component 2 and the first shell wall 111 are easily assembled and connected, which is beneficial to improving the connection reliability between the pole component 2 and the first shell wall 111.

[0450] Please refer again Figure 30 and Figure 31 For example, the first housing wall 111 has a fourth annular groove C1 surrounding the mounting hole 112. The fourth annular groove C1 is open in a direction away from the electrode component 3 (i.e., the fourth annular groove C1 is open in a direction away from the active material coating portion 32). The edge of the pole component 2 has a flange portion 241 surrounding the pole component 2, and the flange portion 241 is embedded in the fourth annular groove C1. This facilitates supporting and positioning the connection between the pole component 2 and the first housing wall 111, facilitating welding the two from the outside of the first housing wall 111 (i.e., the side facing away from the active material coating portion 32).

[0451] Please refer again Figure 30 and Figure 31For example, the thickness of the flange portion 241 matches the groove depth T1 of the fourth annular groove C1, where "matching" means that the thickness of the flange portion 241 is substantially consistent with the groove depth of the fourth annular groove C1. This facilitates welding of the flange portion 241 to the first shell wall 111. The thickness of the flange portion 241 is not too large relative to the groove depth of the fourth annular groove C1, thereby reducing unnecessary space occupation. The thickness of the flange portion 241 is also not too small relative to the groove depth of the fourth annular groove C1, thereby meeting welding strength requirements.

[0452] For example, please refer to Figure 6 , and combined with Figure 30 and Figure 31 The ratio of the width W2 of the pole component 2 to its length L2 satisfies 10% to 60%. This range applies to both the positive and negative pole components 2. Furthermore, the ratio of the width W2 of the pole component 2 to its length L2 can also be 25% to 40%. For example, if the width W2 of the pole component 2 is approximately 21 mm and the length L2 of the pole component 2 is approximately 63 mm, the ratio of the width W2 of the pole component 2 to its length L2 is approximately 33%.

[0453] Therefore, by setting the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 to meet 10% to 60%, the overall area of ​​the pole component 2 can be relatively large, which is conducive to ensuring that the electrical connection area between the pole component 2 and the electrode component 3 can meet relatively large requirements. At the same time, the width of the pole component 2 is relatively small relative to the length. In this way, when connecting the pole component 2 and the electrode component 3, the pole component 2 can be placed with one side edge in the width direction facing the active material coating portion 32. Since the width of the pole component 2 is small, it is conducive to shortening the distance between the pole component 2 and the active material coating portion 32, thereby shortening the length of the conductive portion 4 and reducing the redundancy of the conductive portion 4.

[0454] For example, please refer to Figure 6 , the pole component 2 can be set to: the ratio of the width W2 of the pole component 2 to the width W1 of the first shell wall 111 is 20% to 90%, and this range is applicable to both the positive pole component 2 and the negative pole component 2. Furthermore, the ratio of the width W2 of the pole component 2 to the width W1 of the first shell wall 111 is 70% to 80%. For example, the width W2 of the pole component 2 is about 21mm, the width W1 of the first shell wall 111 is about 28m, and the ratio of the width W2 of the pole component 2 to the width W1 of the first shell wall 111 is about 75%. As a result, it is beneficial for the pole component 2 to make full use of the space in the width direction of the first shell wall 111. For example, the width W1 of the first shell wall 111 is consistent with the size of the battery cell 102 in the width direction of the first shell wall 111, for example Figure 3The width of the first shell wall 111 shown in FIG. 1 is consistent with the dimension of the battery cell 102 in the second direction F2 .

[0455] For example, please refer to Figure 6 When two pole components 2 are provided on the first shell wall 111 and are spaced apart along the length direction of the first shell wall 111, the ratio of the length L2 of the pole component 2 to the length L1 of the first shell wall 111 is 25%±15% (i.e., 10% to 40%). This range is applicable to both the positive pole component 2 and the negative pole component 2. Furthermore, the ratio of the length L2 of the pole component 2 to the length L1 of the first shell wall 111 is 15% to 30%. For example, the length L2 of the pole component 2 is approximately 63 mm, the length L1 of the first shell wall 111 is approximately 297 mm, and the ratio of the length L2 of the pole component 2 to the length L1 of the first shell wall 111 is approximately 21%. Thus, it is beneficial for the pole component 2 to fully utilize the space in the length direction of the first shell wall 111. Thus, it is beneficial for the pole component 2 to fully utilize the space in the length direction of the first shell wall 111. For example, the length L1 of the first shell wall 111 is consistent with the size of the battery cell 102 in the length direction of the first shell wall 111, for example Figure 3 The length of the first shell wall 111 shown in FIG. 1 is consistent with the dimension of the battery cell 102 in the third direction F3 .

[0456] For example, please refer to Figure 34 The shape of the mounting hole 112 matches the contour of the pole component 2. For example, when the pole component 2 includes the adapter structure 22, the contour of the adapter structure 22 (that is, the outer ring shape of the adapter structure 22) matches the shape of the mounting hole 112, thereby facilitating the connection between the pole component 2 and the first shell wall 111, and facilitating the pole component 2 to expose more area toward the accommodating cavity 13, which is conducive to accommodating the conductive part 4 and / or connecting with the conductive part 4.

[0457] Exemplarily, the shape of the mounting hole 112 matches the contour of the pole component 2, and when an orthographic projection is made on a projection plane perpendicular to the thickness direction of the first shell wall 111, the orthographic projection of the mounting hole 112 on the projection plane completely falls within the orthographic projection range of the pole component 2 on the projection plane, thereby making the first shell wall 111 and the pole component 2 have a certain overlapping area, which is conducive to a simple and reliable connection between the two.

[0458] In some embodiments of the present application, Figure 34 , Figure 34Exploded view of the first shell wall and the pole component provided in some embodiments of the present application; the mounting hole 112 is a long strip hole, and the pole component 2 is formed into a long strip structure that matches the shape of the mounting hole 112. The specific shape of the long strip is not limited, for example, it can be rectangular, elliptical, runway-shaped, etc. Therefore, it is beneficial to increase the area of ​​the pole component 2, so as to increase the connection area between the pole component 2 and the electrode component 3, thereby improving the current passing capacity. In addition, combined with Figure 30 and Figure 31 , when the pole component 2 needs to extend from the mounting hole 112 to the outside of the first shell wall 111, the pole component 2 is then flipped from the outside of the first shell wall 111 to cover the pole component 2 at the mounting hole 112, and then the pole component 2 is connected to the first shell wall 111. If the pole component 2 is set to a long strip structure that matches the shape of the mounting hole 112, the pole component 2 can be adjusted to an angle where its thickness direction is close to the width direction of the mounting hole 112 and passes through the mounting hole 112. After passing through the mounting hole 112, the thickness direction of the pole component 2 is rotated to be close to the thickness direction of the first shell wall 111. In this way, the space required for the flipping movement of the pole component 2 is smaller, which can reduce the space required for the flipping of the pole component 2, thereby shortening the length of the conductive part 4, saving materials and reducing costs, and reducing the redundancy of the conductive part 4, reducing the space occupied by the conductive part 4 in the accommodating cavity 13, which is conducive to improving the energy density of the battery cell 102.

[0459] For example, please refer to Figure 32 and Figure 33 During the processing of the battery cell 102, the electrode component 3 and the terminal post component 2 can be connected first, and then the terminal post component 2 can be assembled and connected to the housing component 1. For example, after the electrode component 3 and the terminal post component 2 are connected, the electrode component 3 and the terminal post component 2 can be placed together on the inner side of the first housing wall 111. In this way, the terminal post component 2 can be covered on the mounting hole 112 of the first housing wall 111 from the inner side of the first housing wall 111 (i.e., the side close to the active material coating portion 32). At this time, the edge of the terminal post component 2 is supported on the side of the first housing wall 111 close to the electrode component 3. Therefore, since the terminal post component 2 is covered on the first housing wall 111 from the inner side of the first housing wall 111, the electrode component 3 and the terminal post component 2 can be placed together on the inner side of the first housing wall 111, and the terminal post component 2 does not need to pass through the mounting hole 112, thereby reducing the number of operation steps and reducing the difficulty of operation.

[0460] Please refer again Figure 32 and Figure 33For example, the edge of the pole component 2 has a fourth annular groove C1 that opens away from the electrode component 3 (i.e., the fourth annular groove C1 opens away from the active material coating portion 32). The first shell wall 111 includes an overlap portion 1112 surrounding the mounting hole 112, and the overlap portion 1112 is embedded in the fourth annular groove C1. This facilitates supporting and positioning the connection between the pole component 2 and the first shell wall 111, facilitating welding of the two from the outside of the first shell wall 111 (i.e., the side facing away from the active material coating portion 32).

[0461] Please refer again Figure 32 and Figure 33 For example, the thickness of the overlapping portion 1112 matches the groove depth T2 of the fourth annular groove C1, where "matching" means that the thickness of the overlapping portion 1112 is substantially consistent with the groove depth of the fourth annular groove C1. This facilitates welding of the overlapping portion 1112 to the first shell wall 111. The thickness of the overlapping portion 1112 is not too large relative to the groove depth of the fourth annular groove C1, thereby reducing unnecessary space occupation. The thickness of the overlapping portion 1112 is also not too small relative to the groove depth of the fourth annular groove C1, thereby meeting welding strength requirements.

[0462] Please refer again Figure 7 In some embodiments of the present application, the tab portion 33 extends to the pole body 21 and is connected to the pole body 21, for example, by welding, bonding with conductive adhesive, or punching. In this case, the conductive portion 4 may only include the tab portion 33, and the conductive member 41 extending from the tab portion 33 to the pole body 21 may be omitted, thereby reducing the material cost of the conductive member 41 and eliminating the step of connecting the conductive member 41 to the tab portion 33.

[0463] In some embodiments of the present application, reference is made to Figure 7 The tab portion 33 includes a gathered portion 313 formed by stacking and connecting multiple tab sheets 311 .

[0464] Exemplarily, the tab portion 33 of the electrode component 3 includes a stacked portion 312 formed by stacking and gathering multiple tab sheets 311. The multiple tab sheets 311 in the stacked portion 312 are connected to form a gathered portion 313. The electrode component 3 includes one or more electrode assemblies 31, each of which has a positive tab sheet 311 and a negative tab sheet 311. Multiple tab sheets 311 of the same polarity are stacked and gathered to form the stacked portion 312, thereby facilitating pre-processing of the tab portion 33 or connection with other components.

[0465] For example, the multiple layers of tabs 311 in the stacking section 312 may belong to the same electrode assembly 31 or may belong to different electrode assemblies 31. That is, multiple layers of tabs 311 of the same polarity in the same electrode assembly 31 may be gathered together to form the stacking section 312, or multiple layers of tabs 311 of the same polarity in different electrode assemblies 31 may be gathered together to form the stacking section 312. For example, all tabs 311 of the same polarity in the electrode component 3 may be gathered together to form the stacking section 312, thereby reducing the number of stacking sections 312.

[0466] In the above technical solution, the multi-layered tabs 311 in the stacked portion 312 are connected to form a gathered portion 313, so that the multi-layered tabs 311 in the gathered portion 313 are electrically conductive. That is, the multi-layered tabs 311 in the gathered portion 313 are not only stacked, but also connected and conductive. The connection method of the multi-layered tabs 311 in the gathered portion 313 is not limited, and can be, for example, welding (such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure fusion welding, or brazing, etc.), perforation connection, or bonding with conductive adhesive, etc. For example, ultrasonic welding can be performed on multi-layered tabs 311 of the same polarity, and the ultrasonic weld mark formed is the gathered portion 313.

[0467] Illustratively, the multiple layers of tabs 311 in the gathered portion 313 may belong to the same electrode assembly 31 or may belong to different electrode assemblies 31. That is, multiple layers of tabs 311 of the same polarity in the same electrode assembly 31 may be connected to form the gathered portion 313, or multiple layers of tabs 311 of the same polarity in different electrode assemblies 31 may be connected to form the gathered portion 313. Illustratively, all tabs 311 of the same polarity in the electrode component 3 may be connected to form the gathered portion 313, thereby reducing the number of gathered portions 313.

[0468] In the above technical solution, the multi-layered pole ear sheets 311 in the pole ear portion 33 are pre-connected to form a gathered portion 313. The gathered portion 313 can be in the form of a plate with a certain rigidity in which the multi-layered pole ear sheets 311 are connected together, rather than in the form of a fluffy multi-layered foil. This facilitates the assembly and connection operations between the pole ear portion 33 and other components, such as punching operations and welding operations, so that pores are not easily formed in the weld formed between the pole ear portion 33 and other components, thereby improving the connection reliability and conductivity of the weld, and making the conductivity of the electrode component 3 and the pole column component 2 more stable and reliable.

[0469] For example, during processing, multiple electrode assemblies 31 can be stacked first, and the multi-layered tabs 311 of the same polarity of the multiple electrode assemblies 31 can be ultrasonically welded to form a gathered portion 313, thereby improving the problem of tensile stress between the tabs 311 caused by the asynchrony of the electrode assemblies 31, which causes the gathered portion 313 to crack in the form of ultrasonic weld marks.

[0470] Please refer again Figure 7 In some embodiments of the present application, the tab portion 33 includes a gathered portion 313 formed by stacking and connecting multiple tab sheets 311. At least a portion of the gathered portion 313 is laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21 (e.g., by welding, bonding, punching, etc.). The term "laid" means that at least a portion of one side surface of the gathered portion 313 in the thickness direction is in face-to-face contact with the inner end surface 211 of the pole body 21.

[0471] Thus, by pre-connecting (e.g., ultrasonically welding) the multiple layers of tab sheets 311 in the tab portion 33 to form the gathered portion 313, the gathered portion 313 can take the form of a plate with a certain degree of rigidity, rather than a loose, multi-layered foil. This facilitates the mating connection between the tab portion 33 and the pole body 21, making the welding of the tab portion 33 and the pole body 21 more reliable and less prone to the formation of pores in the weld. This can improve the connection reliability and conductivity of the weld, making the electrical conduction between the electrode component 3 and the pole component 2 more stable and reliable. Furthermore, by laying at least a portion of the gathered portion 313 on the inner end surface 211 of the pole body 21, the connection area between the tab portion 33 and the pole body 21 can be increased, thereby improving the connection reliability and current carrying capacity.

[0472] Please refer again Figure 7 In some embodiments of the present application, the gathered portion 313 is completely laid on the inner end surface 211 of the pole body 21. That is, the inner end surface 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 surface 211 of the pole body 21, so that the gathered portion 313 can be completely flattened, and the projection of the gathered portion 313 completely falls on the inner end surface 211 of the pole body 21. In this way, the pole ear 33 will not be damaged due to bending the gathered portion 313, thereby improving the charging performance of the pole ear 33, and it is beneficial to increase the connection area between the inner end surface 211 of the pole body 21 and the gathered portion 313, thereby improving the current flow efficiency, and facilitating the welding pressure nozzle to press the gathered portion 313 tightly, thereby improving the connection reliability between the gathered portion 313 and the pole body 21.

[0473] For example, referring to Figure 28 When the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21 and the inner end surface 211 of the pole body 21 is smaller than the area of ​​the gathered portion 313, a portion of the gathered portion 313 can be laid on the inner end surface 211 of the pole body 21, and the remaining portion can be laid on the surrounding area 2201. At this time, the gathered portion 313 can also be in a completely flat and extended state.

[0474] In some embodiments of this application, please refer to Figure 5 The pole ear portion 33 is connected to the pole body 21 through the conductive member 41. Thus, by indirectly connecting the pole ear portion 33 and the pole body 21 through the conductive member 41, the length of the pole ear portion 33 can be shortened, and problems such as wrinkling, bending, and breaking of the pole ear piece 311 can be improved. Furthermore, by flexibly designing the shape and material of the conductive member 41, the difficulty of connecting to the pole body 21 can be reduced, and the convenience of connecting the conductive member 41 and the pole body 21 can be improved.

[0475] For example, the laminate portion 312 can be connected to the conductive member 41, thereby eliminating the step of connecting the laminate portion 312 to form the gathered portion 313. Alternatively, for example, the gathered portion 313 can be connected to the conductive member 41 after the multiple layers of tabs 311 in the laminate portion 312 are connected to form the gathered portion 313, thereby allowing for flexible and diverse design of the structural form of the conductive member 41.

[0476] For example, please refer again to Figure 5 , the conductive member 41 can be connected to the inner end surface 211 of the pole body 21, thereby shortening the length of the conductive member 41. For example, the conductive member 41 may include a second connecting section 412, which can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21, thereby improving the connection reliability and charging performance of the conductive member 41 and the pole body 21. Alternatively, for example, the conductive member 41 can also be connected to other locations of the pole body 21, for example, the conductive member 41 can be pre-embedded in the pole body 21, or penetrated through the pole body 21 to connect to the pole body 21, etc.

[0477] In some embodiments of this application, please refer to Figures 35A-35D The conductive member 41 includes a first connecting section 411, which includes two clamping portions 4110. The tab portion 33 includes a tab end 331, which is clamped between the two clamping portions 4110 and connected to the clamping portions 4110 (e.g., welded, punched, or bonded with conductive adhesive). The tab end 331 can be either a laminated portion 312 or a gathered portion 313. Thus, the two clamping portions 4110 can be used to limit the tab end 331, thereby improving the connection reliability of the multiple layers of tab sheets 311 in the tab end 331. Furthermore, in some examples, by providing two clamping portions 4110, the tab end 331 clamped between the two clamping portions 4110 can be in the state of a laminated portion 312, eliminating the step of connecting the multiple layers of tab sheets 311 in the laminated portion 312 to form a gathered portion 313, thereby simplifying the processing steps and improving processing efficiency.

[0478] Please refer again Figures 35A-35DExemplarily, the conductive member 41 includes a second connecting segment 412, which is laid on and connected to the inner end surface 211 of the electrode body 21. The conductive member 41 is bent at the connection between the first connecting segment 411 and the second connecting segment 412, so that the first connecting segment 411 is located on the side of the second connecting segment 412 facing away from the electrode body 21 (or on the side closer to the active material coating portion 32). One of the clamping portions 4110 supports the side of the tab end 331 facing away from the electrode body 21 (or on the side closer to the active material coating portion 32). Thus, the support provided by the clamping portion 4110 on the tab portion 33 improves the redundancy of the tab portion 33 and reduces the risk of a short circuit caused by the tab portion 33 being inserted upside down into the active material coating portion 32. Furthermore, the bent conductive member 41 can act as a buffer, reducing the risk of the electrode component 3 impacting the first shell wall 111 and improving the reliability of the battery cell 102.

[0479] In addition, in order to facilitate bending, the conductive member 41 can be set to be in the form of reduced material at the connection position between the first connecting segment 411 and the second connecting segment 412, for example, the width can be shortened, or the thickness can be thinned, etc. In this way, the first connecting segment 411 and the second connecting segment 412 can each have a certain rigidity, which facilitates the connection between the first connecting segment 411 and the pole ear portion 33, and facilitates the connection between the second connecting segment 412 and the pole body 21, and also facilitates the conductive member 41 to bend at the connection position between the first connecting segment 411 and the second connecting segment 412.

[0480] In some embodiments of this application, please refer to Figures 36A-36C The tab portion 33 includes a gathered portion 313 formed by stacking and connecting multiple tab sheets 311. The conductive member 41 includes a first connecting segment 411. The gathered portion 313 is stacked on one side of the first connecting segment 411 in the thickness direction and connected to the first connecting segment 411. The first connecting segment 411 is in the form of a plate. The thickness direction of the first connecting segment 411 and the gathered portion 313 are consistent. The two are stacked along the thickness direction of the first connecting segment 411. This simplifies the coordination between the gathered portion 313 and the conductive member 41, which is conducive to improving production efficiency.

[0481] Please refer again Figures 36A-36C For example, the first connecting segment 411 supports the side of the gathered portion 313 facing away from the pole body 21, so that the gathered portion 313 is clamped between the inner end surface 211 of the pole body 21 and the first connecting segment 411. Thus, the support of the gathered portion 313 by the first connecting segment 411 can improve the redundancy of the pole lug 33 and reduce the risk of a short circuit caused by the pole lug 33 being inserted upside down into the active material coating portion 32.

[0482] In some embodiments of this application, please refer to Figure 5The conductive portion 4 is bent to form at least two opening slots 42, wherein the openings of the two opening slots 42 are oriented in different directions and are adjacent in the direction from the pole body 21 to the active material coating portion 32 (eg Figure 5 As shown, one of the two adjacent open slots 42 faces left, and the other faces right. Thus, the conductive portion 4 can present a serpentine shape that bends back and forth. The conductive portion 4 can act as a buffer. When the battery cell 102 is used in a vibrating environment, it can reduce the impact of the active material coating portion 32 against the first shell wall 111, thereby protecting the electrode component 3 and improving the reliability of the battery cell 102. Furthermore, because the conductive portion 4 does not extend randomly, it can reduce the risk of interference and scratching between the tabs 311 in the conductive portion 4, as well as the risk of the tab 311 being inserted upside down into the active material coating portion 32, thereby further improving the reliability of the battery cell 102.

[0483] For example, please refer again to Figure 5 When the conductive portion 4 includes a pole ear portion 33 and a conductive member 41 connected to the pole ear portion 33, and the pole ear portion 33 is connected to the pole body 21 through the conductive member 41, the conductive member 41 and the pole ear portion 33 are bent together to form two adjacent opening slots 42 with openings facing opposite directions. For example, an opening slot 42 is defined between the first connecting segment 411 and the second connecting segment 412, and another opening slot 42 is defined between the first connecting segment 411 and the pole ear portion 33. As a result, the conductive portion 4 can present an S-shape that bends back and forth, thereby shortening the length of the conductive portion 4, simplifying the structure of the conductive portion 4, and facilitating the processing of the conductive portion 4. Alternatively, for example, please refer to Figure 21 When the conductive portion 4 is connected to the pole body 21 through the pole ear portion 33 , the pole ear portion 33 is bent alone to form two adjacent opening slots 42 with openings facing opposite directions.

[0484] In some embodiments of this application, please refer to Figure 3 The battery cell 102 further includes a pressure relief device 6, which is disposed within the housing component 1. For example, the pressure relief device 6 can be an explosion-proof valve mounted on the housing component 1, or can be integrally formed within a thinned region of the housing component 1. Thus, by providing the pressure relief device 6, when the pressure within the housing component 1 exceeds a preset value, the pressure can be released in a targeted manner through the pressure relief device 6, thereby improving the safety and reliability of the battery cell 102.

[0485] For example, in combination Figure 3, the pressure relief device 6 and the pole component 2 are located on the same side. Since the pole component 2 is provided on the first shell wall 111, when the pressure relief device 6 is also provided on the first shell wall 111, the pressure relief device 6 and the pole component 2 are located on the same side, for example, both are provided on the top of the battery cell 102, or both are provided on the bottom of the battery cell 102, or both are provided on the same side of the battery cell 102, etc. In this way, the design of other shell walls other than the first shell wall 111 can be simplified, and the structure and processing of the battery cell 102 can be simplified. Among them, the shell component 1 can be surrounded by multiple non-coplanar walls. For example, a rectangular shell component 1 is surrounded by six walls, one of which is the first shell wall 111. If the pressure relief device 6 and the pole component 2 are provided on the same wall, the two are located on the same side.

[0486] Exemplarily, the pressure relief device 6 and the pole component 2 are located on opposite sides. Since the pole component 2 is located on the first shell wall 111, when the pressure relief device 6 is located on a wall of the housing component 1 other than the first shell wall 111, for example, if the end of the housing 11 opposite the opening 113 is the first shell wall 111, and the pressure relief device 6 is located on the second shell wall 114, or if the pressure relief device 6 is located on the housing cover 12, then the pressure relief device 6 and the pole component 2 are located on opposite sides. Thus, there is no need to consider the space occupied by the pressure relief device 6 on the first shell wall 111 to reduce the volume of the pole component 2, thereby allowing the shape and area of ​​the pole component 2 to be flexibly designed as needed. The housing component 1 can be formed by multiple non-coplanar walls. For example, a rectangular housing component 1 is formed by six walls, one of which is the first shell wall 111. If the pressure relief device 6 is located on any wall other than the first shell wall 111 and the pole component 2 is located on the first shell wall 111, then the two are located on opposite sides.

[0487] According to the second embodiment of the present application, the present embodiment further provides a battery 100, comprising a battery cell 102 according to any of the above-described solutions. It is worth noting that the battery 100 according to the embodiment of the present application may or may not include a housing 101. Therefore, since the reliability of the battery cell 102 according to the embodiment of the present application is improved, the performance of the battery 100 is thereby improved.

[0488] For example, the battery 100 may further include a busbar component, and there are multiple battery cells 102, and at least two of them are electrically connected via the busbar component. This allows for the series and / or parallel connection of multiple battery cells 102. For example, when multiple battery cells 102 are connected in series, the negative pole component 2 of one battery cell 102 is connected to the positive pole component 2 of the next battery cell 102 via one busbar component, while the positive pole component 2 of the battery cell 102 is connected to the negative pole component 2 of the previous battery cell 102 via another busbar component.

[0489] For example, in combination Figure 2 The battery 100 includes a housing 101, a plurality of battery cells 102 housed in the housing 101, and a bottom plate 1013 at the bottom of the housing 101. The pole component 2 is disposed on a side of the housing component 1 close to the bottom plate 1013, or on a side of the housing component 1 facing away from the bottom plate 1013.

[0490] During use of the battery 100, for example, when it is used in a vehicle, the housing bottom plate 1013 is located at the bottom of the housing 101 in the direction of gravity. Thus, when the pole component 2 is located on the side of the housing 1 close to the housing bottom plate 1013, it indicates that the pole component 2 is located at the bottom of the housing 1 in the direction of gravity. When the pole component 2 is located on the side of the housing 1 away from the housing bottom plate 1013, it indicates that the pole component 2 is located at the top of the housing 1 in the direction of gravity. Thus, the relative position of the pole component 2 and the housing bottom plate 1013 is not limited, allowing for flexible configuration of the orientation of the battery cells 102 and the housing 101.

[0491] Among them, when the pole component 2 of the battery cell 102 is arranged on the side of the shell component 1 facing the box bottom plate 1013, the battery cell 102 is in an inverted state, and the decompression product is sprayed in the direction away from the passenger compartment, which is safer; when the pole component 2 of the battery cell 102 is arranged on the side of the shell component 1 close to the box bottom plate 1013, the battery cell 102 is in an upright state, and the electrolyte is not easy to leak.

[0492] According to a third embodiment of the present application, an electrical device is provided, comprising a battery 100 according to any of the aforementioned solutions, wherein the battery 100 is configured to provide electrical energy to the electrical device. The electrical device may be any of the aforementioned devices or systems employing the battery 100. The improved performance of the battery 100 facilitates improved operating performance of the electrical device.

[0493] Below, some specific embodiments according to the present application are described.

[0494] Example 1

[0495] Combine Figure 37 and Figures 38A-38F The shell component 1 has an accommodating cavity 13. The shell component 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 covers the opening 113 of the shell body 11 to form an accommodating cavity 13 together with the shell body 11. The shell cover 12 is a first shell wall 111, and the first shell wall 111 has a mounting hole 112. The pole component 2 is installed on the first shell wall 111 and is provided at the mounting hole 112.

[0496] Combine Figure 37 and Figures 38A-38FThe pole component 2 is a minimalist self-sealing structure, comprising a pole body 21, a transition structure 22, and an insulating sealing structure 23. The transition structure 22 surrounds the pole body 21. The insulating sealing structure 23 is insulated and fitted between the pole body 21 and the transition structure 22, and includes a sealing structure 231 that seals the pole body 21 and the transition structure 22. The transition structure 22 is connected to the first shell wall 111.

[0497] Combine Figure 37 and Figures 38A-38F The electrode component 3 includes a plurality of stacked electrode assemblies 31 , having an active material coating portion 32 accommodated in the accommodating cavity 13 , and a pole ear portion 33 connected to the active material coating portion 32 , and the pole ear portion 33 is connected to the pole body 21 through a conductive member 41 .

[0498] Combine Figure 37 and Figures 38A-38F 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. The pole ear end 331 of the pole ear portion 33 is clamped between the two clamping portions 4110 and connected to the clamping portions 4110. The second connecting section 412 is laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21. The conductive member 41 is bent at the connection position between the first connecting section 411 and the second connecting section 412 so that the first connecting section 411 is located on the side of the second connecting section 412 facing away from the pole body 21, and one of the clamping portions 4110 is supported on the side of the pole ear end 331 facing away from the pole body 21.

[0499] Combine Figure 37 and Figures 38A-38FWhen processing the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (for example, the fourth direction F4 shown in the figure), and the stacked multiple electrode assemblies 31 are bound with a binding member (such as blue glue). The multiple layers of pole tabs 311 of the multiple electrode assemblies 31 with the same polarity are stacked and gathered to form a stacking portion 312. The stacking portion 312 serves as the pole tab end 331. The stacking portion 312 is clamped between the two clamping portions 4110, and the stacking portion 312 and the clamping portion 4110 are welded. Then, the conductor is installed in the direction of the pole tab 33 relative to the active material coating portion 32 toward the mounting hole 112. At least the second connecting section 412 of the electrical component 41 passes through the mounting hole 112 from the inner side of the shell cover 12 to the outer side of the shell cover 12; the shell cover 12 is placed under the active material coating part 32, and the top of the shell cover 12 is integrally formed with a bracket 121, and the lower end of the active material coating part 32 is supported on the bracket 121, and then the insulating film 7 is coated on the outside of the active material coating part 32, and the lower end of the insulating film 7 is hot-melt connected to the bracket 121; then, the shell body 11 is placed so that the opening 113 faces downward, and the shell body 11 is put on the outside of the active material coating part 32 from top to bottom, and the lower end of the shell body 11 is welded to the shell cover 12. Afterwards, the shell body 11 is laid flat, the mounting hole 112 is opened horizontally, and the second connecting section 412 of the conductive member 41 is connected to the pole component 2 placed on the outside of the shell cover 12 on the outside of the shell cover 12. Then, the pole component 2 is connected to the mounting hole 112 from the outside of the shell cover 12. Afterwards, the shell body 11 is turned over so that the shell cover 12 is located above the shell body 11 and the pole component 2 is located on the top of the shell cover 12. The adapter structure 22 is welded and fixed to the shell cover 12.

[0500] Example 2

[0501] The shell component 1 has an accommodating cavity 13 and includes a shell body 11 that participates in forming the accommodating cavity 13. One end of the shell body 11 has an opening 113. The end of the shell body 11 opposite to the opening 113 is a first shell wall 111, and the first shell wall 111 has a mounting hole 112. The pole component 2 is installed on the first shell wall 111 and is provided at the mounting hole 112.

[0502] Combine Figures 39A-39D The pole component 2 is a minimalist self-sealing structure, comprising a pole body 21, a transition structure 22, and an insulating sealing structure 23. The transition structure 22 surrounds the pole body 21. The insulating sealing structure 23 is insulated and fitted between the pole body 21 and the transition structure 22, and includes a sealing structure 231 that seals the pole body 21 and the transition structure 22. The transition structure 22 is connected to the first shell wall 111.

[0503] The electrode component 3 includes a plurality of stacked electrode assemblies 31 , and has an active material coating portion 32 accommodated in the accommodation cavity 13 , and a pole ear portion 33 connected to the active material coating portion 32 . The pole ear portion 33 is directly connected to the pole body 21 .

[0504] Combine Figures 39A-39D When processing the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (for example, the fourth direction F4 shown in the figure), and the multiple layers of electrode tabs 311 of the multiple electrode assemblies 31 with the same polarity are stacked and connected to form a gathered portion 313. Then, the electrode component 3 is installed into the shell body 11 with the electrode tab portion 33 facing the mounting hole 112 relative to the active material coating portion 32. As the electrode component 3 moves into the shell body 11, the gathered portion 313 passes through the outside of the mounting hole 112 and is connected to the pole column component 2 located outside the first shell wall 111 on the outside of the first shell wall 111. Then, the pole column component 2 connected with the gathered portion 313 is covered with the mounting hole 112 from the outside of the first shell wall 111, and then the adapter structure 22 is welded and fixed to the first shell wall 111.

[0505] The welding position between the pole component 2 and the conductive portion 4 is located outside the shell body 11 , which can prevent conductive chips generated during the welding process from entering the shell body 11 and causing damage to the electrode component 3 .

[0506] Example 3

[0507] The housing component 1 has an accommodating cavity 13 and includes a first housing wall 111 that forms the accommodating cavity 13. The first housing wall 111 has a mounting hole 112. The pole component 2 is mounted on the first housing wall 111 and is located at the mounting hole 112. In this embodiment, the specific structure of the first housing wall 111 is not limited. For example, it can be a wall surface of the housing body 11 or the housing cover 12.

[0508] Combine Figures 40A-40D The pole component 2 is a minimalist self-sealing structure, comprising a pole body 21, a transition structure 22, and an insulating sealing structure 23. The transition structure 22 surrounds the pole body 21. The insulating sealing structure 23 is insulated and fitted between the pole body 21 and the transition structure 22, and includes a sealing structure 231 that seals the pole body 21 and the transition structure 22. The transition structure 22 is connected to the first shell wall 111.

[0509] The electrode component 3 includes a plurality of stacked electrode assemblies 31 , and has an active material coating portion 32 accommodated in the accommodation cavity 13 , and a pole ear portion 33 connected to the active material coating portion 32 . The pole ear portion 33 is directly connected to the pole body 21 .

[0510] Combine Figures 40A-40DWhen processing the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (for example, the fourth direction F4 shown in the figure), and the multi-layer electrode tabs 311 of the multiple electrode assemblies 31 with the same polarity are stacked and connected to form a gathering portion 313. Then, the gathering portion 313 is connected to the pole component 2, and the pole component 2 connected with the gathering portion 313 is passed through the mounting hole 112 from the inner side of the first shell wall 111 to the outer side of the first shell wall 111. Then, the pole component 2 connected with the gathering portion 313 is covered with the mounting hole 112 from the outer side of the first shell wall 111, and then the adapter structure 22 is welded and fixed to the first shell wall 111.

[0511] Example 4

[0512] The housing component 1 has an accommodating cavity 13 and includes a first housing wall 111 that forms the accommodating cavity 13. The first housing wall 111 has a mounting hole 112. The pole component 2 is mounted on the first housing wall 111 and is located at the mounting hole 112. In this embodiment, the specific structure of the first housing wall 111 is not limited. For example, it can be a wall surface of the housing body 11 or the housing cover 12.

[0513] Combine Figures 41A-41D The pole component 2 is a minimalist self-sealing structure, comprising a pole body 21, a transition structure 22, and an insulating sealing structure 23. The transition structure 22 surrounds the pole body 21. The insulating sealing structure 23 is insulated and fitted between the pole body 21 and the transition structure 22, and includes a sealing structure 231 that seals the pole body 21 and the transition structure 22. The transition structure 22 is connected to the first shell wall 111.

[0514] The electrode component 3 includes a plurality of stacked electrode assemblies 31 , and has an active material coating portion 32 accommodated in the accommodation cavity 13 , and a pole ear portion 33 connected to the active material coating portion 32 . The pole ear portion 33 is directly connected to the pole body 21 .

[0515] Combine Figures 41A-41D When processing the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (for example, the fourth direction F4 shown in the figure), and the multi-layer electrode tabs 311 of the multiple electrode assemblies 31 with the same polarity are stacked and connected to form a gathered portion 313. Then, the gathered portion 313 is connected to the pole component 2, and the pole component 2 connected with the electrode component 3 and the electrode component 3 are placed on the inner side of the first shell wall 111. Then, the pole component 2 connected with the electrode component 3 is covered with the mounting hole 112 from the inner side of the first shell wall 111, and then the adapter structure 22 is welded and fixed to the first shell wall 111.

[0516] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0517] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include: The housing component comprises a first housing wall, wherein a mounting hole is formed on the first housing wall; An electrode component, housed in the housing component; A pole component is located on the same side of the electrode component as the first shell wall and is installed at the installation hole. The pole component includes a pole body, a transition structure and an insulating sealing structure. The pole body is connected to the electrode component, the transition structure surrounds the pole body and is connected to the first shell wall, and the insulating sealing structure is insulated and sealed between the transition structure and the pole body.

2. The battery cell according to claim 1, characterized in that: The insulating sealing structure comprises a sealing structure component, at least a portion of which is clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall.

3. The battery cell according to claim 1, characterized in that: The insulating sealing structure comprises a sealing structure member, and the sealing structure member is arranged around the peripheral side of the transition structure close to the pole body.

4. The battery cell according to claim 1, characterized in that: The pole body comprises a peripheral portion, and the transition structure is clamped on both sides of the peripheral portion in the inner and outer directions of the first shell wall through the insulating sealing structure; The insulating sealing structure includes a sealing structure member, which extends along the entire circumference of the peripheral portion and is clamped between the peripheral portion and the transition structure.

5. The battery cell according to claim 4, characterized in that: At least a portion of the sealing structure is disposed on a side of the peripheral portion close to or away from the electrode component, so as to be clamped between the peripheral portion and the transition structure along the inner and outer directions of the first shell wall.

6. The battery cell according to claim 5, characterized in that: The insulating sealing structure further includes a first insulating member, and the transition structure is clamped on both sides of the peripheral portion along the inner and outer directions through the first insulating member and the sealing structure member respectively.

7. The battery cell according to claim 5, characterized in that: The sealing structure is an integral structure and surrounds the peripheral portion, so as to be respectively located on a side of the peripheral portion close to the electrode component and a side away from the electrode component. The transition structure is clamped on both sides of the peripheral portion along the inner and outer directions by the sealing structure.

8. The battery cell according to claim 4, characterized in that: The adapter structure includes a first adapter ring and a second adapter ring, wherein the second adapter ring is arranged on a side of the first adapter ring close to or away from the electrode component, the second adapter ring is connected to the first adapter ring, and one of the first adapter ring and the second adapter ring is connected to the first shell wall; The end of the first adapter ring close to the pole body and the end of the second adapter ring close to the pole body are spaced along the inner-outer direction so as to be clamped on both sides of the peripheral portion along the inner-outer direction by the insulating sealing structure respectively, and the sealing structure is clamped between at least one of the first adapter ring and the second adapter ring and the peripheral portion.

9. The battery cell according to claim 8, characterized in that: The insulating sealing structure further includes a first insulating member, at least a portion of the sealing structure member is clamped between the first adapter ring and the peripheral portion, and the second adapter ring is insulated and fixedly matched with the peripheral portion through the first insulating member.

10. The battery cell according to claim 9, characterized in that: The first insulating member and the pole body, as well as the first insulating member and the second adapter ring are respectively connected by injection molding.

11. The battery cell according to claim 9, characterized in that: The second adapter ring includes a stop ring portion, and at least a portion of the first insulating member is clamped between the stop ring portion and the peripheral portion along the inner-outer direction.

12. The battery cell according to claim 8, characterized in that: The sealing structure is an integral structure and outstrips the peripheral portion so as to be respectively located on a side of the peripheral portion close to the electrode component and a side away from the electrode component, and the first adapter ring and the second adapter ring are respectively clamped along the inner and outer directions on both sides of the sealing structure away from the peripheral portion.

13. The battery cell according to claim 8, characterized in that: The first adapter ring is connected to the first shell wall, the second adapter ring is arranged on a side of the first adapter ring away from the electrode component, and at least a portion of the sealing structure is clamped between the first adapter ring and the peripheral portion.

14. The battery cell according to claim 13, characterized in that: The first adapter ring and the second adapter ring are both metal rings and are connected by welding, and the first adapter ring is connected by welding to the first shell wall.

15. The battery cell according to claim 8, characterized in that: The adapter structure also includes a first insulating frame, which is connected to a side of the first adapter ring close to the electrode component.

16. The battery cell according to claim 8, characterized in that: A first annular groove matching with the second adapter ring is formed on one side surface of the first adapter ring close to the second adapter ring, and the second adapter ring is embedded in the first annular groove.

17. The battery cell according to claim 4, characterized in that: The adapter structure includes a third adapter ring, and the third adapter ring includes a first extension portion and a second extension portion that are integrally arranged; The end of the first extension portion close to the pole body and the end of the second extension portion close to the pole body are spaced along the inner and outer directions so as to be clamped on both sides of the peripheral portion along the inner and outer directions by the insulating sealing structure respectively, and the sealing structure is clamped between at least one of the first extension portion and the second extension portion and the peripheral portion.

18. The battery cell according to claim 17, characterized in that: The insulating sealing structure further includes a first insulating member, at least a portion of the sealing structure member is clamped between the first extending portion and the peripheral portion, and the second extending portion is insulated and fixedly matched with the peripheral portion through the first insulating member.

19. The battery cell according to claim 18, characterized in that: The second extending portion rivets and presses the first insulating member against the peripheral portion.

20. The battery cell according to claim 18, characterized in that: The first insulating member and the pole body, as well as the first insulating member and the second extending portion are respectively connected by injection molding, and the first extending portion rivets the sealing structure against the peripheral portion.

21. The battery cell according to claim 17, characterized in that: The sealing structure is an integral structure and outstrips the peripheral portion so as to be respectively located on a side of the peripheral portion close to the electrode component and a side away from the electrode component, and the first extension portion and the second extension portion are respectively clamped on both sides of the sealing structure away from the peripheral portion in the inner and outer directions.

22. The battery cell according to claim 21, characterized in that: One of the first extension portion and the second extension portion rivets the sealing structure against the peripheral edge portion.

23. The battery cell according to claim 17, characterized in that: One of the first extension part and the second extension part is a preformed part, and the other is a riveted formed part. The fixed end of the preformed part is connected to the first shell wall, and the fixed end of the riveted formed part is connected to the preformed part. The riveted formed part rivets the insulating sealing structure against the peripheral edge.

24. The battery cell according to claim 23, characterized in that: The preformed portion includes an outer ring portion and an inner ring portion, the outer ring portion is connected to the first shell wall and is arranged around the riveted forming portion and the inner ring portion, the inner ring portion and the riveted forming portion are respectively clamped on both sides of the peripheral portion along the inner and outer directions through the insulating sealing structure, and the riveted forming portion and the inner ring portion are respectively connected to the outer ring portion.

25. The battery cell according to claim 23, characterized in that: The preformed portion includes an outer ring portion and a bent portion, the outer ring portion is connected to the first shell wall and is arranged around the riveted forming portion and the bent portion, the bent portion and the riveted forming portion are respectively clamped on both sides of the peripheral portion along the inner and outer directions by the insulating sealing structure, and the bent portion is bent and connected between the riveted forming portion and the outer ring portion.

26. The battery cell according to claim 17, characterized in that: At least a portion of the sealing structure is clamped between the third adapter ring and a side of the peripheral portion close to the electrode component.

27. The battery cell according to claim 17, characterized in that: The third adapter ring is an integrally formed metal ring, and the third adapter ring is connected to the first shell wall by welding.

28. The battery cell according to claim 17, characterized in that: The adapter structure also includes a second insulating frame, which is connected to a side of the third adapter ring close to the electrode component.

29. The battery cell according to claim 4, characterized in that: The sealing structure comprises a first portion, which is arranged on a side of the peripheral portion close to the electrode component and is clamped between the peripheral portion and the transition structure along the inner and outer directions.

30. The battery cell according to claim 29, characterized in that The pole body includes a main body portion, the peripheral portion is arranged around the main body portion, and the main body portion protrudes relative to the peripheral portion toward the direction close to the electrode component. The sealing structure also includes a second part, which is connected to an end of the first part close to the main body portion and extends relative to the first part toward the direction close to the electrode component to be spaced between the outer peripheral surface of the main body portion and the transition structure.

31. The battery cell according to claim 29, characterized in that: The sealing structure also includes a third part, which is connected to the end of the first part away from the pole body, and extends to the peripheral area of ​​the peripheral part in a direction away from the electrode component relative to the first part, and is sealed between the outer peripheral surface of the peripheral part and the transition structure.

32. The battery cell according to claim 4, characterized in that: The transition structure has a second annular groove that matches the sealing structure, and the sealing structure is embedded in the second annular groove.

33. The battery cell according to claim 1, characterized in that: The transition structure includes a matching ring portion, and the pole body includes a penetration portion penetrated through the matching ring portion, and a first limiting portion and a second limiting portion connected to the penetration portion and clamped on both sides of the matching ring portion; The insulating sealing structure includes a sealing structure member, which extends along the entire circumference of the matching ring portion and is clamped between the matching ring portion and the pole body.

34. The battery cell according to claim 33, characterized in that: At least a portion of the sealing structure is disposed on a side of the matching ring portion close to or away from the electrode component, so as to be clamped between at least one of the first limiting portion and the second limiting portion and the matching ring portion.

35. The battery cell according to claim 34, characterized in that: The insulating sealing structure also includes a second insulating member, wherein the sealing structure member is clamped between one of the first limiting portion and the second limiting portion and the matching ring portion, and the second insulating member is clamped between the other of the first limiting portion and the second limiting portion and the matching ring portion.

36. The battery cell according to claim 34, characterized in that The sealing structure is an integral structure and surrounds the mating ring portion so as to be respectively located on a side of the mating ring portion close to the electrode component and a side away from the electrode component. The pole body is clamped on both sides of the mating ring portion along the inner and outer directions of the first shell wall by the sealing structure.

37. The battery cell according to claim 33, characterized in that: At least a portion of the sealing structure is clamped between the first limiting portion and the matching ring portion, and the second limiting portion is assembled and connected with the penetration portion at a side of the matching ring portion away from the first limiting portion.

38. The battery cell according to claim 33, characterized in that: At least a portion of the sealing structure is clamped between the first limiting portion and the matching ring portion, the second limiting portion and the penetration portion are integrated, and the second limiting portion rivets the insulating sealing structure against the matching ring portion.

39. The battery cell according to claim 38, characterized in that The pole body includes a first pole piece and a second pole piece, the second pole piece includes the penetration portion, the first limiting portion and the second limiting portion, the penetration portion surrounds a matching hole, the first pole piece is installed on a side of the second pole piece away from the electrode component and covers the matching hole, and the electrode component is connected to the first pole piece via a conductive portion extending into the matching hole.

40. The battery cell according to claim 33, characterized in that The first limiting portion is clamped on a side of the matching ring portion close to the electrode component, and the sealing structure includes a fifth portion clamped between the matching ring portion and the first limiting portion.

41. The battery cell according to claim 40, characterized in that The sealing structure also includes a sixth part, which is connected to an end of the fifth part close to the pole body and extends in a direction away from the electrode component relative to the fifth part to be spaced between the outer circumference of the penetration part and the inner circumference of the matching ring part.

42. The battery cell according to claim 40, characterized in that The adapter structure includes a fourth adapter ring, which includes a main body ring portion and the mating ring portion. The main body ring portion is arranged around the mating ring portion, and the mating ring portion is raised relative to the main body ring portion in a direction away from the electrode component to form a third annular groove on a side of the mating ring portion close to the electrode component, and the sealing structure is matched with the third annular groove.

43. The battery cell according to claim 42, characterized in that The sealing structure also includes a seventh part, which is connected to an end of the fifth part away from the pole body and extends relative to the fifth part toward the electrode component to seal between the outer circumference of the first limiting part and the inner circumference of the main body ring part.

44. The battery cell according to claim 33, characterized in that The adapter structure further includes a fourth adapter ring, which is a metal ring and includes the matching ring portion, and the fourth adapter ring is connected to the first shell wall by welding.

45. The battery cell according to claim 44, characterized in that The adapter structure also includes a third insulating frame, and the third insulating frame is connected to a side of the fourth adapter ring close to the electrode component.

46. ​​The battery cell according to claim 1, characterized in that The transition structure is formed into a long strip extending along the length direction of the first shell wall, and the contour shape of the pole body matches the contour shape of the transition structure.

47. The battery cell according to claim 1, characterized in that The transition structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is arranged at the center of the transition structure and has a circular outline.

48. The battery cell according to claim 1, characterized in that The position of the inner end surface of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, and the surrounding area is flush with the inner end surface of the pole body.

49. The battery cell according to claim 1, characterized in that The position of the inner end surface of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, and the inner end surface of the pole body protrudes from the surrounding area in a direction close to the electrode component.

50. The battery cell according to claim 47, characterized in that The position of the inner end surface of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, and the inner end surface of the pole body protrudes from the surrounding area in a direction close to the electrode component; The electrode component is connected to the pole component through a conductive portion, the conductive portion includes a pole ear portion and a conductive member connected to the pole ear portion, the conductive member 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 relative to the first conductive segment in a direction away from the electrode component, and the pole ear portion is connected to the second conductive segment.

51. The battery cell according to claim 1, characterized in that The pole component is surrounded by a receiving groove which is recessed relative to the first shell wall in a direction away from the electrode component and is open in a direction toward the electrode component. The electrode component is connected to the pole component through a conductive part, and at least part of the conductive part is received in the receiving groove and connected to the pole body.

52. The battery cell according to claim 51, characterized in that The accommodating groove is formed on one side of the pole body and the transition structure close to the electrode component, and the transition structure bulges relative to the first shell wall in a direction away from the electrode component, so that the accommodating groove is recessed relative to the first shell wall in a direction away from the electrode component.

53. The battery cell according to claim 51, characterized in that The surface of one end of the pole body facing the electrode component is the inner end surface of the pole body, the inner end surface of the pole body participates in forming the accommodating groove, and the conductive part is connected to the inner end surface of the pole body.

54. The battery cell according to claim 1, characterized in that The transition structure includes a connection end connected to the first shell wall, and the transition structure includes a raised portion protruding relative to the connection end in a direction away from the pole component, and the pole body is mounted on the raised portion.

55. The battery cell according to claim 54, characterized in that The raised portion and the transition structure are formed with a receiving groove on one side close to the electrode component. The electrode component is connected to the pole component via a conductive portion. At least a portion of the conductive portion is received in the receiving groove and connected to the pole body.

56. The battery cell according to claim 1, characterized in that The transition structure includes a connection end connected to the first shell wall, and the transition structure includes an inwardly sunken portion that is recessed relative to the connection end toward a direction close to the pole component, and the pole body is mounted on the inwardly sunken portion.

57. The battery cell according to claim 56, characterized in that A side surface of the sunken portion close to the electrode component is a surrounding area surrounding the pole body, and the inner end surface of the pole body protrudes from the surrounding area toward the direction close to the electrode component, or the surrounding area is flush with the inner end surface of the pole body.

58. The battery cell according to claim 1, characterized in that The transition structure includes a connection end connected to the first shell wall, one of the connection end and the first shell wall has a fourth annular groove that fits with the other, and the fourth annular groove extends along the entire circumference of the mounting hole and is open in a direction away from the electrode component.

59. The battery cell according to claim 1, characterized in that The shell component has a accommodating cavity, and the shell component includes a shell body that participates in forming the accommodating cavity, the shell body is a semi-closed cylindrical shape 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 that participates in forming the accommodating cavity, and the shell cover is a flat plate and serves as the first shell wall.

60. The battery cell according to claim 1, characterized in that The electrode component includes an active material coating portion accommodated in the housing component, and a pole ear portion connected to the active material coating portion, wherein the pole ear portion extends to the pole body and is connected to the pole body.

61. The battery cell according to claim 60, characterized in that The surface of one side of the pole body close to the electrode component is the inner end surface of the pole body, and the pole ear portion includes a gathered portion formed by stacking and connecting multiple layers of pole ear sheets, and at least part of the gathered portion is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body.

62. The battery cell according to claim 1, characterized in that The electrode component includes an active material coating portion accommodated in the shell component, and a pole ear portion connected to the active material coating portion, and the pole ear portion is connected to the pole body through a conductive member.

63. The battery cell according to claim 62, characterized in that The conductive member includes a first connecting section, the first connecting section includes two clamping parts, the pole lug portion includes a pole lug end portion, the pole lug end portion is clamped between the two clamping parts and connected to the clamping parts.

64. The battery cell according to claim 63, characterized in that The surface of one end of the pole body close to the electrode component is the inner end face of the pole body, the conductive member includes a second connecting segment, the second connecting segment is laid on the inner end face of the pole body and connected to the inner end face of the pole body, the conductive member is bent at the connection position between the first connecting segment and the second connecting segment, so that the first connecting segment is located on the side of the second connecting segment away from the pole body, and one of the clamping portions is supported on the side of the pole ear end away from the pole body.

65. The battery cell according to claim 62, characterized in that The pole ear portion includes a gathered portion formed by stacking and connecting multiple pole ear sheets, and the conductive member includes a first connecting segment. The gathered portion is stacked on one side of the first connecting segment in a thickness direction and connected to the first connecting segment.

66. The battery cell according to claim 65, characterized in that The surface of one end of the pole body close to the electrode component is the inner end surface of the pole body, and the first connecting section is supported on the side of the gathering portion away from the pole body, so that the gathering portion is clamped between the inner end surface of the pole body and the first connecting section.

67. The battery cell according to claim 1, characterized in that The electrode component includes an active material coating portion housed in the shell component, the active material coating portion is connected to the pole body via a conductive portion, the conductive portion is bent to form at least two open grooves, wherein the openings of the two open grooves are in different directions and are adjacent to each other in the direction from the pole body to the active material coating portion.

68. The battery cell according to claim 67, characterized in that The electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion is connected to the pole column body through the pole ear portion, and the pole ear portion is bent alone to form two adjacent opening grooves with openings facing opposite directions; or, the electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion includes the pole ear portion and a conductive member connected to the pole ear portion, the pole ear portion is connected to the pole column body through the conductive member, and the conductive member and the pole ear portion are bent together to form two adjacent opening grooves with openings facing opposite directions.

69. The battery cell according to any one of claims 1 to 68, characterized in that: It also includes a pressure relief device, which is arranged on the shell component and is located on the same side or the opposite side as the pole component.

70. A battery, characterized in that: Comprising a battery cell according to any one of claims 1-69.

71. The battery according to claim 70, characterized in that The battery comprises a box body, the battery cells are multiple and are accommodated in the box body, the bottom of the box body is a box body bottom plate, and the pole component is arranged on a side of the shell component close to the box body bottom plate, or on a side of the shell component away from the box body bottom plate.

72. An electrical device, characterized in that: Comprising a battery according to claim 70 or 71.

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