Battery cell, battery, and electric device

Abstract

A battery cell (102), a battery (100), and an electrical device belong to the field of battery technology. The battery cell (102) includes: a housing component (1), a terminal component (2), and an electrode component (3). The housing component (1) includes a first housing wall (111) with a mounting hole (112) formed on the first housing wall (111). The electrode component (3) is housed in the housing component (1). The terminal component (2) is located on the same side of the electrode component (3) as the first housing wall (111) and is installed at the mounting hole (112). The terminal component (2) includes a terminal body (21), a connecting structure (22), and an insulating and sealing structure (23). The terminal body (21) is connected to the electrode component (3). The connecting structure (22) surrounds the terminal body (21) and is connected to the first housing wall (111). The insulating and sealing structure (23) is insulating and sealingly fitted between the connecting structure (22) and the terminal body (21).

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. A power battery consists of several individual battery cells; however, the material cost of these individual cells needs to be reduced.

[0003] Summary of the Invention

[0004] This application provides a battery cell, a battery, and an electrical device that can reduce the material cost of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including: a housing component, a terminal component, and an electrode component. The housing component includes a first housing wall with a mounting hole formed thereon. The electrode component is housed within the housing component. The terminal component is located on the same side as the first housing wall and is mounted at the mounting hole. The terminal component includes a terminal body, a connecting structure, and an insulating and sealing structure. The terminal body is connected to the electrode component. The connecting structure surrounds the terminal 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 body.

[0006] In the above technical solution, on the one hand, since the electrode post component includes not only the electrode post body connected to the electrode component, but also a transition structure connected to the first shell wall, and an insulating and sealing structure is provided between the transition structure and the electrode post body, it plays an insulating and sealing role at the connection between the electrode post body and the transition structure, making the electrode post component itself self-sealing, which facilitates the installation and mating of the electrode post component and the shell component, and saves installation time and cost; on the other hand, in a conventional structure, the electrode post body needs to be pressed on a sealing element placed on the first shell wall to achieve the sealing of the shell component, but this sealing method, in order to ensure the seal... The required preload force and the pressure exerted on the first shell wall by the terminal post component are relatively large. When the shell thickness is thin, it is easy to cause deformation or damage to the first shell wall. Therefore, with this design, when installing the terminal post component onto the first shell wall, there is no need to consider insulation and sealing issues between the adapter structure and the first shell wall. Only a reliable connection around the entire circumference is required. Thus, it is not necessary to apply a large force to the terminal post component to meet the sealing requirements at the connection between the adapter structure and the first shell wall. This can improve the stress deformation problem of the first shell wall, thereby helping to reduce the shell wall thickness, reduce material costs, reduce the weight of the battery cell, and increase energy density.

[0007] In some embodiments, the insulating sealing structure includes a sealing structure member, at least a portion of which is sandwiched between the adapter structure and the pole body in the inward and outward directions of the first housing wall.

[0008] In the above technical solution, by setting at least a portion of the sealing structure between the adapter structure and the electrode body in the inner and outer directions of the first shell wall, an axial seal is achieved between the adapter structure and the electrode body. This axial seal provides a more reliable sealing effect and improves the electrolyte leakage problem at the mating point of the adapter structure and the electrode body. Furthermore, if the electrode component only includes the electrode body, and an axial seal is provided between the electrode body and the first shell wall, sealing pressure needs to be applied along the axial direction of the mounting hole, which would lead to excessive stress on the first shell wall. However, the embodiments of this application, by integrating the axial seal into the electrode component, can reduce the axial force on the first shell wall, improve the reliability of the first shell wall, and also appropriately thin the first shell wall to reduce cost and increase energy density.

[0009] In some embodiments, the insulating sealing structure includes a sealing structure member disposed around the periphery of the adapter structure near the pole body.

[0010] In the above technical solution, by placing the sealing structure in the inner ring of the transition structure, the sealing structure can be close to the mating position between the transition structure and the pole body. This facilitates sealing the mating position between the transition structure and the pole body with a shorter path, improving the reliability of the seal. It also helps to reduce the size of the sealing structure, reduce the sealing area, and make it easier to achieve compression sealing. The seal is less prone to failure and the sealing effect is improved.

[0011] 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 inward and outward directions of the first shell wall by an insulating sealing structure. The insulating sealing structure includes a sealing structure member that extends circumferentially around the peripheral portion and is clamped between the peripheral portion and the transition structure.

[0012] In the above technical solution, the pole component has a simple structure and is easy to process, enabling simple and effective fixation and insulating fit between the pole body and the adapter structure. Furthermore, the periphery of the pole body clamps the sealing portion with the adapter structure, allowing the sealing portion to be positioned at the mating point between the adapter structure and the pole body. This facilitates sealing at the mating point with a shorter path, improving sealing reliability. It also helps reduce the size and sealing area of ​​the sealing portion, making compression sealing easier, reducing sealing failure, and enhancing the sealing effect.

[0013] In some embodiments, at least a portion of the sealing structure is disposed on the side of the periphery near or away from the electrode component, so as to be clamped between the periphery and the transition structure in the inward and outward directions of the first shell wall.

[0014] In the above technical solutions, the axial seal between the adapter structure and the electrode body can achieve a relatively reliable sealing effect. If the electrode component only includes the electrode body, and an axial seal is provided between the electrode body and the first shell wall, sealing pressure needs to be applied along the axial direction of the mounting hole, which will lead to excessive stress on the first shell wall. However, the embodiments of this application reduce the axial force on the first shell wall by integrating the axial seal into the electrode component. In addition, when at least a portion of the sealing structure is located on the side of the peripheral portion near the electrode component, sealing can be performed from the side of the peripheral portion near the receiving cavity, which can more effectively suppress electrolyte leakage from the mating position between the electrode body and the adapter structure, thereby improving the sealing effect.

[0015] In some embodiments, the insulating sealing structure further includes a first insulating element, and the transition structure is clamped on both sides of the peripheral portion in the inward and outward directions by the first insulating element and the sealing structure element respectively.

[0016] In the above technical solution, since the insulating and sealing structure includes a first insulating component and a sealing structure component that are not integrated into a single piece, the design and processing of the insulating and sealing structure can be simplified. Moreover, depending on the specific requirements for matching with the pole body and the adapter structure, the first insulating component can be set as a basically incompressible insulating component without sealing effect, or it can be set as a compressible sealing component with sealing effect, thereby meeting different practical requirements.

[0017] In some embodiments, the sealing structure is an integral structure with an outer periphery, located on the side of the periphery closer to the electrode component and the side away from the electrode component, respectively, and the adapter structure is clamped on both sides of the periphery in the inward and outward directions by the sealing structure.

[0018] In the above technical solution, since the sealing structure is an integral structure with an outer perimeter, the number of parts and assembly steps can be reduced.

[0019] In some embodiments, the adapter structure includes a first adapter ring and a second adapter ring. The second adapter ring is disposed on the side of the first adapter ring that is 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 ends of the first adapter ring and the second adapter ring that are close to the electrode body are spaced apart in the inward and outward directions to be clamped on both sides of the peripheral portion in the inward and outward directions by an insulating sealing structure. The sealing structure is clamped between at least one of the first adapter ring and the second adapter ring and the peripheral portion.

[0020] In the above technical solution, the adapter structure includes a first adapter ring and a second adapter ring that are arranged internally and externally and assembled together, which facilitates the assembly and connection of the adapter structure with the insulating sealing structure and the pole body, making the pole component easy to process and manufacture, and making it easy to control the compression of the sealing structure component, thereby improving the sealing reliability.

[0021] In some embodiments, the insulating sealing structure further includes a first insulating member, at least a portion of which is sandwiched between the first transition ring and the peripheral portion, and the second transition ring is insulated from and fixedly fitted to the peripheral portion by the first insulating member.

[0022] In the above technical solution, since the insulating and sealing structure includes a first insulating component and a sealing structure component that are not integrated into a single piece, the design and processing of the insulating and sealing structure can be simplified. Moreover, depending on the specific requirements for matching with the pole body and the adapter structure, the first insulating component can be set as a basically incompressible insulating component without sealing effect, or it can be set as a compressible sealing component with sealing effect, thereby meeting different practical requirements.

[0023] In some embodiments, the first insulating member is injection molded to be connected to the pole body, and the first insulating member is injection molded to be connected to the second adapter ring.

[0024] In the above technical solution, the electrode body is easy to process, and a reliable connection and insulation fit between the adapter structure and the electrode body can be achieved.

[0025] 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 in an inward and outward direction.

[0026] In the above technical solution, by setting a second adapter ring connected to the first adapter ring, the first insulating component is clamped by the stop ring part and the peripheral part of the second adapter ring, thereby eliminating the injection molding process.

[0027] In some embodiments, the sealing structure is an integral structure with an outer periphery, located on the side of the periphery near the electrode component and the side away from the electrode component, respectively, and the first adapter ring and the second adapter ring are clamped on the two sides of the sealing structure away from the periphery in the inward and outward directions, respectively.

[0028] In the above technical solution, since the sealing structure is an integral structure with an outer perimeter, the number of parts and assembly steps can be reduced.

[0029] In some embodiments, a first adapter ring is connected to a first housing wall, a second adapter ring is disposed on the side of the first adapter ring away from the electrode component, and at least a portion of the sealing structure is sandwiched between the first adapter ring and the peripheral portion.

[0030] In the above technical solution, sealing can be achieved from the side of the periphery near the receiving cavity, which can more effectively suppress electrolyte leakage from the mating position between the electrode body and the adapter structure, thereby improving the sealing effect. Moreover, with this type of electrode component, the relative positions of each part of the electrode component and the first shell wall can be determined by the structural design of the first adapter ring, so that it can be flexibly designed as needed to reduce the space occupied by the electrode component inside or outside the shell component.

[0031] In some embodiments, the first adapter ring and the second adapter ring are both metal rings and are welded together, and the first adapter ring is welded to the first shell wall.

[0032] 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.

[0033] In some embodiments, the adapter structure further includes a first insulating frame connected to the side of the first adapter ring near the electrode component.

[0034] In the above technical solution, the first insulating frame can be used to insulate between the electrode component and the first adapter ring, which reduces the difficulty of setting up an insulating and sealing structure here.

[0035] In some embodiments, the side surface of the first adapter ring near the second adapter ring has a first annular groove that mates with the second adapter ring, and the second adapter ring is embedded in the first annular groove.

[0036] In the above technical solution, the first annular groove can be used to position the second adapter ring, which facilitates the improvement of the assembly efficiency and connection reliability of the first adapter ring and the second adapter ring.

[0037] In some embodiments, the adapter structure includes a third adapter ring, which includes an integrally formed first extension and a second extension; the ends of the first extension near the pole body and the ends of the second extension near the pole body are spaced apart in the inward and outward directions to be clamped on both sides of the peripheral portion by an insulating sealing structure in the inward and outward directions, and the sealing structure is clamped between at least one of the first extension and the second extension and the peripheral portion.

[0038] In the above technical solution, since the third adapter ring includes an integrally formed first extension and second extension, and the first extension and second extension are integrated into the same structural component, the process of connecting the first extension and the second extension can be eliminated, the use of parts can be reduced, the first extension and the second extension are not easy to separate, and the clamping reliability of the peripheral part through the insulating sealing structure can be improved.

[0039] In some embodiments, the insulating sealing structure further includes a first insulating member, at least a portion of which is sandwiched between the first extension and the peripheral portion, and the second extension is insulated from and fixedly fitted to the peripheral portion by the first insulating member.

[0040] In the above technical solution, since the insulating sealing structure includes a first insulating component and a sealing structure component that are not integrated into one piece, the design and processing of the insulating sealing structure can be simplified.

[0041] In some embodiments, the second extension rivets the first insulating member against the periphery.

[0042] In the above technical solution, the assembly of the third adapter ring with the pole body and the insulating sealing structure can be achieved without the need for assembly and welding processes. Furthermore, when only the second extension is riveted to the first extension, clamping the sealing structure between the first extension and the peripheral portion makes it easy to control the compression amount of the sealing structure, achieving a better compression effect.

[0043] In some embodiments, the first insulating member is injection molded to be connected to the pole body, and the first insulating member is injection molded to be connected to the second extension, wherein the first extension rivets the sealing structure member against the periphery.

[0044] In the above technical solution, the electrode body is easy to process, and a reliable connection and insulation fit between the adapter structure and the electrode body can be achieved.

[0045] In some embodiments, the sealing structure is an integral structure with an outer periphery, located on the side of the periphery close to the electrode component and the side away from the electrode component, respectively, and the first extension and the second extension are respectively clamped on both sides of the sealing structure away from the periphery in the inward and outward directions.

[0046] In the above technical solution, since the sealing structure is an integral structure with an outer perimeter, the number of parts and assembly steps can be reduced.

[0047] In some embodiments, one of the first extension and the second extension rivets the sealing structure against the periphery.

[0048] In the above technical solution, the assembly of the third adapter ring with the pole body and the insulation and sealing structure can be achieved without the need for assembly and welding processes.

[0049] In some embodiments, one of the first extension and the second extension is a preformed part and the other is a riveting part. The fixed end of the preformed part is connected to the first shell wall, and the fixed end of the riveting part is connected to the preformed part. The riveting part rivets the insulating sealing structure against the peripheral part.

[0050] In the above technical solution, the third adapter ring can be clamped around the periphery by an insulating and sealing structure through pre-processing and riveting, thus eliminating the need for assembly and welding processes.

[0051] 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 disposed around the riveting forming portion and the inner ring portion. The inner ring portion and the riveting forming portion are respectively clamped on both sides of the peripheral portion in the inward and outward directions by an insulating sealing structure. The riveting forming portion and the inner ring portion are respectively connected to the outer ring portion.

[0052] In the above technical solution, the third adapter ring has a simple structure and is easy to process and manufacture.

[0053] 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 disposed around the riveting forming portion and the bent portion. The bent portion and the riveting forming portion are respectively clamped on both sides of the peripheral portion in the inward and outward directions by an insulating sealing structure. The bent portion is bent and connected between the riveting forming portion and the outer ring portion.

[0054] In the above technical solution, the wall thickness and support capacity of the riveted forming part and the bent part are easy to guarantee, which can achieve a good effect of compression and sealing.

[0055] In some embodiments, at least a portion of the sealing structure is clamped between the third adapter ring and the side of the peripheral portion near the electrode component.

[0056] In the above technical solution, sealing can be performed from the side of the periphery near the receiving cavity, which can more effectively suppress electrolyte leakage from the mating position between the electrode body and the adapter structure, thereby improving the sealing effect.

[0057] 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.

[0058] In the above technical solution, the third adapter ring has a simple structure, can be constructed as an integral first extension and second extension, has good structural strength, and is suitable for connection with the first shell wall made of metal.

[0059] In some embodiments, the adapter structure further includes a second insulating frame connected to the side of the third adapter ring near the electrode component.

[0060] 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 for an insulating sealing structure.

[0061] In some embodiments, the sealing structure includes a first portion disposed on the side of the peripheral portion near the electrode component and clamped between the peripheral portion and the transition structure in the inward and outward directions.

[0062] In the above technical solution, sealing can be performed from the side of the periphery near the receiving cavity, which can more effectively suppress electrolyte leakage from the mating position between the electrode body and the adapter structure, thereby improving the sealing effect.

[0063] In some embodiments, the electrode body includes a body portion, a peripheral portion surrounding the body portion, the body portion protruding relative to the peripheral portion toward the direction of proximity to the electrode component, and the sealing structure further includes a second portion connected to one end of the first portion near the body portion and extending relative to the first portion toward the direction of proximity to the electrode component, so as to be spaced between the outer peripheral surface of the body portion and the transition structure.

[0064] In the above technical solution, since the main body of the electrode post protrudes towards the electrode component from its peripheral side, it is beneficial to reduce the space occupied by the electrode post on the outside of the housing component and reduce the size of the battery cell in the direction in which the electrode post component is set. Furthermore, by setting the sealing structure to include a second part spaced between the outer peripheral surface of the main body and the transition structure, insulation at this location can be achieved simply and effectively.

[0065] In some embodiments, the sealing structure further includes a third portion, which is connected to one end of the first portion away from the electrode body and extends relative to the first portion toward the outer peripheral region of the peripheral portion in the direction away from the electrode component, and is sealed between the outer peripheral surface of the peripheral portion and the transition structure.

[0066] In the above technical solution, by setting the sealing structure to include a third part between the outer peripheral surface of the peripheral portion and the adapter structure, the sealing performance of the mating position between the pole body and the adapter structure can be further improved, thereby enhancing the sealing effect of the battery cell.

[0067] 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.

[0068] In the above technical solution, the second annular groove can be used to position the sealing structure, which facilitates the improvement of the assembly efficiency and installation reliability of the sealing structure.

[0069] In some embodiments, the adapter structure includes a mating ring portion, the pole body includes a through portion passing through the mating ring portion, and a first limiting portion and a second limiting portion connected to the through portion and clamped on both sides of the mating ring portion, and the insulating sealing structure includes a sealing structure member that extends circumferentially around the mating ring portion and is clamped between the mating ring portion and the pole body.

[0070] In the above technical solution, the pole component has a simple structure and is easy to manufacture, enabling simple and effective fixation and insulating fit between the pole body and the adapter structure. The sealing structure is clamped by the mating position between the pole body and the mating ring, allowing the sealing structure to be positioned at the mating point between the adapter structure and the pole body. This facilitates sealing at the mating point with a shorter path, improving sealing reliability. Furthermore, it allows for a smaller sealing structure and a smaller sealing area, making compression sealing easier, reducing the likelihood of seal failure, and enhancing the sealing effect.

[0071] In some embodiments, at least a portion of the sealing structure is disposed on the side of the mating ring portion near 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 mating ring portion.

[0072] In the above technical solutions, the axial seal between the adapter structure and the electrode body can achieve a relatively reliable sealing effect. If the electrode component only includes the electrode body, and an axial seal is provided between the electrode body and the first shell wall, sealing pressure needs to be applied along the axial direction of the mounting hole, which will lead to excessive stress on the first shell wall. However, the embodiments of this application reduce the axial force on the first shell wall by integrating the axial seal into the electrode component. In addition, when at least a portion of the sealing structure is located on the side of the mating ring near the electrode component, sealing can be performed from the side of the mating ring near the receiving cavity, which can more effectively suppress electrolyte leakage from the mating position between the electrode body and the adapter structure, thereby improving the sealing effect.

[0073] In some embodiments, the insulating sealing structure further includes a second insulating member, a sealing structure member clamped between one of the first limiting portion and the second limiting portion and the mating ring portion, and a second insulating member clamped between the other of the first limiting portion and the mating ring portion.

[0074] In the above technical solution, since the insulating and sealing structure includes a second insulating component and a sealing structure component that are not integrated into a single piece, the design and processing of the insulating and sealing structure can be simplified. Moreover, depending on the specific requirements for matching with the pole body and the adapter structure, the second insulating component can be set as a basically incompressible insulating component without sealing effect, or it can be set as a compressible sealing component with sealing effect, thereby meeting different practical requirements.

[0075] In some embodiments, the sealing structure is an integral structure and surrounds a mating ring portion, located on the side of the mating ring portion closer to the electrode component and the side away from the electrode component, respectively, and the electrode post body is clamped on both sides of the mating ring portion in the inward and outward directions by the sealing structure.

[0076] In the above technical solution, since the sealing structure is an integral structure and is surrounded by a mating ring, the number of parts and assembly steps can be reduced.

[0077] In some embodiments, at least a portion of the sealing structure is clamped between the first limiting portion and the mating ring portion, and the second limiting portion and the through portion are assembled and connected to the mating ring portion on the side opposite to the first limiting portion.

[0078] In the above technical solution, the second limiting part and the through-hole part are set as separate parts and assembled together. The structure of the pole body is simple and easy to assemble and connect with the adapter structure. In addition, when the second limiting part and the mating ring part clamp the second insulating part, and the second limiting part and the through-hole part are welded, the thermal impact on the sealing structure clamped between the first limiting part and the mating ring part can be reduced, and the sealing reliability of the sealing structure can be improved.

[0079] In some embodiments, at least a portion of the sealing structure is sandwiched between the first limiting portion and the mating ring portion, the second limiting portion is integral with the through portion, and the second limiting portion rivets the insulating sealing structure against the mating ring portion.

[0080] In the above technical solution, the assembly connection between the second limiting part and the insulating sealing structure is achieved by riveting. This reduces the thermal impact of the heat generated during the connection between the second limiting part and the insulating sealing structure on the sealing structure sandwiched between the first limiting part and the mating ring, thereby improving the sealing reliability of the sealing structure. Furthermore, when the second insulating component is sandwiched between the second limiting part and the mating ring, riveting the second limiting part makes it easier to control the compression of the sealing structure, achieving a better compression effect.

[0081] In some embodiments, the electrode body includes a first electrode member and a second electrode member. The second electrode member includes a through portion, a first limiting portion and a second limiting portion. The through portion surrounds a mating hole. The first electrode member is installed on the side of the second electrode member away from the electrode component and covers the mating hole. The electrode component is connected to the first electrode member through a conductive portion extending into the mating hole.

[0082] In the above technical solution, by dividing the electrode body into two parts for assembly, when assembling the battery cell, the first electrode can be connected to the electrode component first, and the second electrode can be connected to the first shell wall first, and then the first and second electrode can be connected. This helps to shorten the conductive part, reduce the redundancy of the conductive part, and reduce material costs. Moreover, the mating hole can serve to accommodate the conductive part, reducing the space occupied by the conductive part in the receiving cavity.

[0083] In some embodiments, the first limiting portion is clamped on the side of the mating ring portion near the electrode component, and the sealing structure includes a fifth portion clamped between the mating ring portion and the first limiting portion.

[0084] In the above technical solution, sealing can be performed from the side of the mating ring near the inside of the housing component, which can more effectively suppress electrolyte leakage from the mating position between the electrode body and the adapter structure, thereby improving the sealing effect.

[0085] In some embodiments, the sealing structure further includes a sixth portion, which is connected to one end of the fifth portion near the electrode body and extends relative to the fifth portion in a direction away from the electrode component, so as to be spaced between the outer peripheral surface of the through portion and the inner peripheral surface of the mating ring portion.

[0086] In the above technical solution, by setting the sealing structure to include a sixth part that is spaced between the outer peripheral surface of the through part and the inner peripheral surface of the mating ring, insulation at this position can be achieved simply and effectively.

[0087] In some embodiments, the adapter structure includes a fourth adapter ring, which includes a body ring portion and a mating ring portion. The body ring portion is disposed around the mating ring portion, and the mating ring portion protrudes relative to the 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 near the electrode component. The sealing structure component is mated to the third annular groove.

[0088] In the above technical solution, since the main body ring of the fourth adapter ring protrudes towards the electrode component relative to the mating ring, it helps to reduce the space occupied by the electrode body inside the housing component. Furthermore, the bending of the fourth adapter ring can form a third annular groove, allowing at least a portion of the sealing structure to be recessed into the third annular groove. For example, the thickness of the recessed portion can be equal to, slightly larger than, or slightly smaller than the depth of the third annular groove. Therefore, by providing the third annular groove, the sealing structure can be positioned, facilitating improved assembly efficiency and installation reliability.

[0089] In some embodiments, the sealing structure further includes a seventh portion, which is connected to one end of the fifth portion away from the electrode body and extends relative to the fifth portion toward the direction of the electrode component to seal between the outer peripheral surface of the first limiting portion and the inner peripheral surface of the body ring portion.

[0090] In the above technical solution, by setting the sealing structure to include a seventh part that also seals between the first limiting part and the body ring part, the sealing performance of the mating position between the pole body and the adapter structure can be further improved, thereby enhancing the sealing effect of the battery cell.

[0091] In some embodiments, the adapter structure further includes a fourth adapter ring, which is a metal ring and includes a mating ring portion, and the fourth adapter ring is welded to the first shell wall.

[0092] 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.

[0093] In some embodiments, the adapter structure further includes a third insulating frame connected to the side of the fourth adapter ring near the electrode component.

[0094] 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 for an insulating sealing structure.

[0095] In some embodiments, the transition structure is formed as an elongated strip extending along the length of the first shell wall, and the outline shape of the pole body matches the outline shape of the transition structure.

[0096] In the above technical solution, when the outline shape of the electrode body is formed into an elongated shape that matches the outline shape of the adapter structure, the area of ​​the electrode body is larger, which is beneficial to increasing the connection area between the conductive part and the electrode body, thereby improving the charging performance.

[0097] In some embodiments, the transition structure is formed as an elongated strip extending along the length of the first shell wall, and the pole body is located in the center of the transition structure and has a circular outline.

[0098] In the above technical solution, the connection position between the adapter structure and the pole body is subjected to uniform force, making it easy to control the compression of the insulation and sealing structure, thereby improving the reliability of the sealing fit between the two. Moreover, the sealing area is relatively small, making it less prone to failure.

[0099] In some embodiments, the position of the inner end face of the adapter structure adjacent to the pole body is a surrounding area around the pole body, and the surrounding area is flush with the inner end face of the pole body.

[0100] In the above technical solution, when the inner end face of the electrode body is small, a part of the electrode connection part of the conductive part can be laid flat on the inner end face of the electrode body, and the rest can be laid flat on the surrounding area, so that the electrode connection part of the conductive part can be supported as a whole, which facilitates the clamping of the welding nozzle and enables the conductive part to be reliably connected to the electrode body.

[0101] In some embodiments, the position of the inner end face of the adapter structure adjacent to the electrode body is a surrounding region around the electrode body, and the inner end face of the electrode body protrudes out of the surrounding region in a direction close to the electrode component.

[0102] In the above technical solution, by setting the inner end face of the electrode body to protrude out of the surrounding area in the direction close to the electrode component, it is equivalent to the electrode body being retracted inward in the direction of the receiving cavity when the height of the electrode body is constant, so as to reduce the space occupied by the electrode component on the outside of the housing component and reduce the size of the battery cell in the direction of setting the electrode component.

[0103] In some embodiments, the position of the inner end face of the adapter structure adjacent to the electrode body is a surrounding area around the electrode body, and the inner end face of the electrode body protrudes from the surrounding area in a direction close to the electrode component; the electrode component is connected to the electrode component through a conductive part, the conductive part including an electrode tab and a conductive element connected to the electrode tab, the conductive element including a first conductive segment laid on the inner end face of the electrode body, and a second conductive segment offset from the inner end face of the electrode body, the second conductive segment protruding from the first conductive segment in a direction away from the electrode component, and the electrode tab being connected to the second conductive segment.

[0104] In the above technical solution, the height difference between the electrode body and the transition structure can be used to accommodate the second conductive section and the tab of the conductive component, thereby making full use of the space, reducing the space occupied by the conductive part in the cavity, and improving the energy density of the battery cell.

[0105] In some embodiments, the electrode post component forms a receiving groove that is recessed relative to the first shell wall in a direction away from the electrode component and open in a direction towards the electrode component. The electrode component is connected to the electrode post component through a conductive portion, at least a portion of which is received in the receiving groove and connected to the electrode post body.

[0106] In the above technical solution, by setting a receiving groove to accommodate the conductive part, the space occupied by the conductive part in the receiving cavity can be reduced, allowing the receiving cavity to have a larger space to accommodate the active material coating part. This is beneficial to increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell. Moreover, since the receiving groove is open towards the electrode components, the conductive part can be easily inserted into the receiving groove, reducing the difficulty of operation.

[0107] In some embodiments, a receiving groove is formed on the side of the electrode component of the electrode post body and the adapter structure, and the adapter structure protrudes relative to the first shell wall in a direction away from the electrode component, so that the receiving groove is recessed relative to the first shell wall in a direction away from the electrode component.

[0108] In the above technical solution, by processing the adapter structure into an outwardly protruding bulge, a portion of the receiving groove is formed on the side of the pole body facing the electrode component, and another portion of the receiving groove is formed on the side of the adapter structure facing the electrode component. The receiving groove has a shape that is concave relative to the first shell wall in the direction away from the electrode component. Thus, both the side of the pole body facing the electrode component and the side of the adapter structure facing the electrode component have a space receiving groove conductive part. This not only facilitates the storage of conductive parts to a greater extent, but also facilitates the design of diverse forms of conductive parts.

[0109] In some embodiments, the surface of the electrode body facing the electrode component is the inner end face of the electrode body, the inner end face of the electrode body participates in forming a receiving groove, and the conductive part is connected to the inner end face of the electrode body.

[0110] In the above technical solution, at least a portion of the receiving groove is surrounded by the side surface of the electrode body facing the electrode component. The conductive part housed in the receiving groove can easily contact and connect to the electrode body, improving connection convenience and simplifying the structure.

[0111] In some embodiments, the adapter structure includes a connection end connected to the first shell wall, and the adapter structure includes a raised portion protruding relative to the connection end in a direction away from the pole member, and the pole body is mounted on the raised portion.

[0112] In the above technical solution, by installing the electrode body on the raised part, the occupation of the cavity by the electrode body can be reduced, thereby increasing the energy density of the battery cell.

[0113] In some embodiments, a receiving groove is formed on the side of the raised portion and the transition structure near 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.

[0114] In the above technical solution, by setting a raised portion, a receiving groove is formed on the raised portion and the side of the transition structure near the electrode component to receive the conductive part, thereby reducing the space occupied by the conductive part in the receiving cavity, so that the receiving cavity has a larger space to accommodate the active material coating part, which is beneficial to increase the volume of the active material coating part, thereby increasing the energy density of the battery cell.

[0115] In some embodiments, the adapter structure includes a connection end connected to the first shell wall, and the adapter structure includes an inner recessed portion recessed relative to the connection end toward the pole member, the pole body being mounted on the inner recessed portion.

[0116] In the above technical solution, when the height of the electrode body is constant, it is equivalent to the electrode body being retracted inward towards the cavity, which helps to reduce the space occupied by the electrode body on the outside of the housing component and reduce the size of the battery cell in the direction of setting the electrode component.

[0117] In some embodiments, the side surface of the recessed portion near the electrode component is a surrounding region surrounding the electrode body, and the inner end face of the electrode body protrudes from the surrounding region in the direction close to the electrode component, or the surrounding region is flush with the inner end face of the electrode body.

[0118] The above technical solutions allow for flexible processing to meet various needs. For example, when the inner end face of the electrode body protrudes from the surrounding area towards the electrode component, the space occupied by the electrode component on the exterior of the housing component can be reduced. For example, when the surrounding area is flush with the inner end face of the electrode body, it facilitates the connection of the conductive parts, making the shape and size of the electrode body unrestricted.

[0119] In some embodiments, a mounting hole is formed on the first housing wall, an electrode post is disposed at the mounting hole, and the adapter structure includes a connecting end connected to the first housing wall. One of the connecting end and the first housing wall has a fourth annular groove that fits into the other. The fourth annular groove extends around the entire circumference of the mounting hole and opens in a direction away from the electrode post.

[0120] In the above technical solution, the fourth annular groove serves as a positioning element for assembly, facilitating the assembly and connection of the pole post component with the first housing wall. Furthermore, because the fourth annular groove is open towards the outer side, the transition structure can be welded to the first housing wall from the outside, improving the ease and reliability of the connection between the pole post component and the first housing wall.

[0121] In some embodiments, the housing component has a receiving cavity, the housing component includes a shell body that participates in forming the receiving 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 housing component includes a shell cover that participates in forming the receiving cavity, the shell cover is flat and serves as a first shell wall.

[0122] In the above technical solution, the structural design of the casing component is flexible, and the placement of the terminal components is also flexible. Furthermore, when the end of the casing opposite the opening is the first casing wall, since the electrode components housed in the casing component are connected to the terminal components mounted on the first casing wall, when the battery vibrates or deforms, the terminal components connected through the busbar component will pull against each other. Because the terminal components are located on the end wall opposite the opening of the casing, the force on the terminal components will be preferentially transmitted to the casing body, rather than directly acting on the casing cover. This not only extends the distance the force is transmitted to the weld between the casing body and the casing cover, but also causes the casing body to deform preferentially under stress, reducing the stress at the weld between the casing body and the casing cover. This effectively reduces the probability of cracking at the weld between the casing body and the casing cover during battery use, improving the reliability of the battery cell. Moreover, since the connection between the casing body and the casing cover is less prone to cracking, there is no need to increase the wall thickness of either to improve the connection reliability, thus helping to reduce weight and material costs, and facilitating the miniaturization of the battery cell or increasing its energy density.

[0123] In some embodiments, the electrode component includes an active material coating portion housed in the housing component and an electrode tab portion connected to the active material coating portion, the electrode tab portion extending to and connected to the electrode post body.

[0124] In the above technical solution, the use of conductive components can be omitted, as can the connection process between the conductive components and the electrode tabs.

[0125] In some embodiments, the side surface of the electrode body near the electrode component is the inner end face of the electrode body, and the tab includes a gathering portion formed by stacking and connecting multiple layers of tab sheets. At least a portion of the gathering portion is laid on the inner end face of the electrode body and connected to the inner end face of the electrode body.

[0126] In the above technical solution, by laying at least a portion of the gathering part on the inner end face of the pole body and connecting it to the inner end face of the pole body, it is beneficial to increase the connection area between the pole ear and the pole body, the connection reliability and the current carrying capacity.

[0127] In some embodiments, the electrode component includes an active material coating portion housed in the electrode post body, and an electrode tab portion connected to the active material coating portion, the electrode tab portion being connected to the electrode post body via a conductive element.

[0128] In the above technical solution, the electrode tab and the electrode post body are indirectly connected by a conductive component, which can shorten the length of the electrode tab, improve the problems of wrinkling, bending and breaking of the electrode tab, and reduce the difficulty of connecting the conductive component and the electrode post body by flexibly designing the shape and material of the conductive component, thereby improving the convenience of connecting the conductive component and the electrode post body.

[0129] In some embodiments, the conductive element includes a first connecting segment, the first connecting segment includes two clamping portions, and the electrode portion includes an electrode end, the electrode end being clamped between the two clamping portions and connected to the clamping portions.

[0130] In the above technical solution, two clamping parts can be used to limit the position of the tab end, improving the connection reliability of the multi-layer tab pieces in the tab end. In addition, in some examples, by setting two clamping parts, the tab end clamped between the two clamping parts can be in a stacked state, which can eliminate the step of connecting the multi-layer tab pieces in the stacked part to form a closing part, thereby simplifying the processing steps and improving processing efficiency.

[0131] In some embodiments, the surface of the electrode body near the electrode component is the inner end face of the electrode body. The conductive element includes a second connecting segment, which is laid on the inner end face of the electrode body and connected to the inner end face of the electrode body. The conductive element 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 electrode body. One of the clamping portions is supported on the side of the electrode tab end away from the electrode body.

[0132] In the above technical solution, the support of the tabs by the clamping part can improve the redundancy of the tabs and reduce the risk of short circuits caused by the tabs being inserted into the active material coating part. Moreover, the bent conductive parts can act as a buffer support, reducing the risk of the electrode components hitting the first shell wall and improving the reliability of the battery cell.

[0133] In some embodiments, the tab portion includes a folded portion formed by stacking and connecting multiple tab sheets, and the conductive element includes a first connecting segment, the folded portion being stacked on one side of the first connecting segment in the thickness direction and connected to the first connecting segment.

[0134] In the above technical solution, the first connecting section is in the form of a plate. The thickness direction of the first connecting section is consistent with that of the gathering part. The two are stacked along the thickness direction of the first connecting section, so the way the gathering part and the conductive part are matched is simple, which is conducive to improving production efficiency.

[0135] In some embodiments, the surface of the electrode body near the electrode component is the inner end face of the electrode body, and the first connecting section is supported on the side of the folding portion away from the electrode body, so that the folding portion is clamped between the inner end face of the electrode body and the first connecting section.

[0136] In the above technical solution, the support of the gathering part by the first connecting section can improve the redundancy of the electrode tab and reduce the risk of short circuit caused by the electrode tab being inserted into the active material coating part.

[0137] In some embodiments, the electrode component includes an active material coating portion housed in the housing component. The active material coating portion is connected to the electrode body via a conductive portion. The conductive portion is bent to form at least two opening slots, wherein the openings of the two opening slots face different directions and are adjacent in the direction from the electrode body to the active material coating portion.

[0138] In the above technical solution, the conductive part can exhibit a serpentine, reciprocating bending shape. This conductive part acts as a buffer, reducing the impact of the active material coating near the first shell wall when the battery cell is used in a vibration environment, thus protecting the electrode components and improving the reliability of the battery cell. Furthermore, because the conductive part does not extend irregularly, it reduces interference and friction between the tabs within the conductive part, as well as the risk of the tabs being inserted backwards near the active material coating, further enhancing the reliability of the battery cell.

[0139] In some embodiments, the electrode component includes a tab connected to the active material coating portion, and a conductive portion is connected to the electrode post body through the tab. The tab is bent independently to form two adjacent opening slots with opposite opening orientations. Alternatively, the electrode component includes a tab connected to the active material coating portion, and the conductive portion includes a tab and a conductive element connected to the tab. The tab is connected to the electrode post body through the conductive element, and the conductive element and the tab are bent together to form two adjacent opening slots with opposite opening orientations.

[0140] In the above technical solution, the conductive part can take the form of a reciprocating S-shape, which can shorten the length of the conductive part, simplify the structure of the conductive part, and facilitate the processing of the conductive part.

[0141] In some embodiments, the battery cell further includes a pressure relief device located on the housing component and on the same side or opposite side as the terminal component.

[0142] In the above technical solutions, when the pressure relief device and the terminal post are located on the same side, the design of other shell walls besides the first shell wall can be simplified, thus simplifying the structure and processing of the battery cell. When the pressure relief device and the terminal post are located on opposite sides, there is no need to consider the space occupied by the pressure relief device in the first shell wall, thereby reducing the volume of the terminal post. This allows for flexible design of the shape and volume of the terminal post as needed.

[0143] Secondly, embodiments of this application also provide a battery, including a battery cell of any of the above-described solutions.

[0144] In the above technical solution, the reliability of the battery cell according to the embodiment of this application is improved, which is beneficial to improving the performance of the battery.

[0145] In some embodiments, the battery includes a housing, multiple battery cells are housed in the housing, the bottom of the housing is a housing bottom plate, and electrode components are disposed on the side of the housing component near the housing bottom plate or on the side of the housing component away from the housing bottom plate.

[0146] In the above technical solution, when the terminal post of the battery cell is located on the side of the housing component facing the bottom plate of the box, the battery cell is in an inverted state, and the depressurized products are ejected in the direction away from the passenger compartment, which is safer; when the terminal post of the battery cell is located on the side of the housing component close to the bottom plate of the box, the battery cell is in an upright state, and the electrolyte is not easy to leak; therefore, the flexible setting of the battery cell and the box orientation can be realized.

[0147] Thirdly, embodiments of this application also provide an electrical device including a battery from any of the above-described solutions.

[0148] In the above technical solution, the improved battery performance is beneficial to enhancing the power consumption performance of the electrical device. Attached Figure Description

[0149] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0150] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0151] Figure 2 is an exploded view of a battery provided in some embodiments of this application;

[0152] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0153] Figure 4 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0154] Figure 5 is a magnified view of a portion of Figure 4;

[0155] Figure 6 is a top view of a battery cell provided in some embodiments of this application;

[0156] Figure 7 is a cross-sectional view along line AA in Figure 6;

[0157] Figure 8 is a schematic diagram of the structure of the pole post component provided in some embodiments of this application;

[0158] Figure 9 is an exploded view of a battery cell provided in some embodiments of this application;

[0159] Figure 10 is a cross-sectional view of the pole post component shown in Figure 9;

[0160] Figure 11 is a cross-sectional view of a pole post component provided in some embodiments of this application;

[0161] Figure 12 is a cross-sectional view of the pole post component provided in some embodiments of this application;

[0162] Figure 13 is a cross-sectional view of the pole post component provided in some embodiments of this application;

[0163] Figure 14 is a cross-sectional view of the pole post component provided in some embodiments of this application;

[0164] Figure 15 is a cross-sectional view of a pole post component provided in some embodiments of this application;

[0165] Figure 16 is a cross-sectional view of a pole post component provided in some embodiments of this application;

[0166] Figure 17 is an exploded view of the pre-processing of the third adapter ring provided in some embodiments of this application;

[0167] Figure 18 is an exploded view of the manufacturing process of the pole post component provided in some embodiments of this application;

[0168] Figure 19 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0169] Figure 20 is a schematic diagram of the pole post component shown in Figure 19;

[0170] Figure 21 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0171] Figure 22 is an exploded view of the pole post component provided in some embodiments of this application;

[0172] Figure 23 is an assembly diagram of the pole post component shown in Figure 22;

[0173] Figure 24 is a cross-sectional view of the pole post component provided in some embodiments of this application;

[0174] Figure 25 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0175] Figure 26 is a cross-sectional view of the pole post component provided in some embodiments of this application;

[0176] Figure 27 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0177] Figure 28 is a cross-sectional view along line BB in Figure 27;

[0178] Figure 29 is a cross-sectional view of the pole post component provided in some embodiments of this application;

[0179] Figure 30 is a partial cross-sectional view of a battery cell provided in some embodiments of this application, in which the electrode component is in a state before being covered by the first shell wall;

[0180] Figure 31 is a diagram showing the pole post component shown in Figure 30 after it is covered by the first shell wall;

[0181] Figure 32 is a partial cross-sectional view of a battery cell provided in some embodiments of this application, in which the terminal component is in a state before being covered by the first shell wall;

[0182] Figure 33 is a diagram showing the pole post component shown in Figure 32 after it is covered by the first shell wall;

[0183] Figure 34 is an exploded view of the first shell wall and pole post components provided in some embodiments of this application;

[0184] Figures 35A-35D are exploded views of the manufacturing process of a battery cell according to an embodiment of this application;

[0185] Figures 36A-36C are exploded views of the processing of a battery cell according to an embodiment of this application;

[0186] Figure 37 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0187] Figures 38A-38F are exploded views of the manufacturing process of a battery cell according to an embodiment of this application;

[0188] Figures 39A-39D are exploded views of the processing of a battery cell according to an embodiment of this application;

[0189] Figures 40A-40D are exploded views of the processing of a battery cell according to an embodiment of this application;

[0190] Figures 41A-41D are exploded views of the processing of a battery cell according to an embodiment of this application.

[0191] Reference numerals: Vehicle 1000; Battery 100; Controller 200; Motor 300; Housing 101; First housing section 1011; Second housing section 1012; Housing bottom plate 1013; Battery cell 102; First direction F1; Second direction F2; Third direction F3; Fourth direction F4; Fifth direction F5; Housing component 1; Housing body 11; First housing wall 111; Inner end face of housing wall 1110; Overlapping part 1112; Mounting hole 112; Opening 113; Second housing wall 114; Housing cover 12; Bracket 121; Receiving cavity 13; Terminal component 2; Terminal body 21; Inner end face of terminal body 211; Peripheral part 212; Body part 213; First terminal component 21a; Second terminal component 21b; Through part 214; Riveting part 2141; Mating hole 21b1; First limiting part 215; Second limiting part 216; Adapter structure 22; Inner ring part 2211 of the adapter structure; Outer ring part 2212 of the adapter structure; Connecting end 22a; Fourth annular groove C1; Raised part 22b; Inwardly recessed part 22c; Inner end face 220 of the adapter structure; Surrounding area 2201; First adapter ring 221; First annular groove 2213; Second adapter ring 222; Stop ring part 2221; Third adapter ring 223; First extension part 2231; Second extension part 2232; Preformed part 223a; Fixed end 223a1 of the preformed part; Outer ring part 223a2; Inner ring part 223a3; Bending part 223a4; Riveting forming part 223b; Fixed end 223b1 of the riveting forming part; First insulating frame 224; Second insulating frame 225; Second annular groove 226; Fourth adapter ring 227; mating ring 2271; body ring 2272; third annular groove 2273; third insulating frame 228; insulating sealing structure 23; sealing structure component 231; axial side portion 231a; peripheral side portion 231b; first part 2311; second part 2312; third part 2313; fifth part 2315; sixth part 2316; seventh part 2317; first insulating component 232; second insulating component 234; flange portion 241; electrode component 3; electrode assembly 31; electrode tab 311; stacked portion 312; gathering portion 313; active material coating portion 32; electrode tab portion 33; electrode tab end 331; conductive portion 4; conductive component 41; first connecting section 411; clamping portion 4110; second connecting section 412; first conductive section 415; second conductive section 416; opening groove 42; 5. Receiving groove; 511. First groove; 512. Third groove; 513. Pressure relief device; 6. Insulating film; 7. Detailed Implementation

[0192] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0193] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0194] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0195] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0196] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0197] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0198] In this application, "multiple" means two or more, including two.

[0199] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, or solid-state batteries, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0200] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. Exemplarily, a battery may include a housing for encapsulating one or more battery cells, or one or more battery modules, the housing preventing liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0201] A single battery cell includes a casing, electrode components, and an electrolyte (which may be a solid electrolyte layer located between the positive and negative electrodes in a solid-state battery). The electrode components include at least one electrode assembly, and both the electrode assembly and the electrolyte are housed within the casing. The electrode assembly includes a positive electrode, a negative electrode, and a separator (this structure can be omitted in solid-state batteries). The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0202] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0203] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as a negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP, polypropylene, PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of this application has a wound or stacked structure.

[0204] In related technologies, when mounting the terminals onto the casing, the connection between the terminals and the casing must be both insulated and sealed. To ensure the seal, a sealing ring is required between the casing and the terminals. To guarantee the seal's effectiveness, a significant pressure needs to be applied to the terminals to compress the sealing ring together with the casing, ensuring the compression meets sealing requirements. However, applying excessive force to the terminals can easily cause the casing to deform due to excessive stress. To address this issue, the casing wall thickness is typically increased, which raises material costs and increases the weight of the battery cell.

[0205] In view of this, the electrode post component provided in this application embodiment, on the one hand, includes not only the electrode post body connected to the electrode component, but also a transition structure connected to the housing wall, and provides an insulating and sealing structure between the transition structure and the electrode post body, which serves to insulate and seal at the connection between the electrode post body and the transition structure, making the electrode post component itself self-sealing, which facilitates the installation and mating of the electrode post component and the housing component, and saves installation time and cost; on the other hand, in conventional structures, the electrode post body needs to be pressed against a sealing element placed on the first housing wall to achieve sealing of the housing component, but this sealing method, in order to ensure The pre-tightening force required for sealing results in a relatively large pressure exerted on the first shell wall by the terminal post component. When the shell thickness is thin, this can easily cause deformation or damage to the first shell wall. Therefore, with this design, when installing the terminal post component onto the shell wall, there is no need to consider insulation and sealing issues between the adapter structure and the shell wall. Only a reliable connection around the entire circumference needs to be achieved. Thus, it is not necessary to apply a large force to the terminal post component to meet the sealing requirements at the connection between the adapter structure and the shell wall. This can improve the stress deformation problem of the shell wall, thereby helping to reduce the shell wall thickness, reduce material costs, reduce the weight of the battery cell, and increase energy density.

[0206] The technical solutions described in the embodiments of this application are applicable to battery cells, batteries containing battery cells, and electrical devices using batteries.

[0207] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0208] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0209] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 is equipped with a battery 100, which can be located at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000.

[0210] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0211] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0212] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a battery cell 102 and a housing 101 for housing the battery cell 102. The housing 101 can have various structural forms.

[0213] In some embodiments, the housing 101 may include a first housing portion 1011 and a second housing portion 1012, which overlap each other, and together define a receiving space for accommodating the battery cell 102. A sealing element may also be provided at the connection point between the first housing portion 1011 and the second housing portion 1012 to achieve a sealed connection. For example, referring to FIG2, the first housing portion 1011 and the second housing portion 1012 may both be hollow structures with an opening on one side, with the opening side of the first housing portion 1011 covering the opening side of the second housing portion 1012, thus forming a housing 101 with a receiving space. As another example, the second housing portion 1012 may be a hollow structure with an opening on one side, and the first housing portion 1011 may be a cover that covers the opening side of the second housing portion 1012. Box 101 can be in various shapes, such as cylindrical box, cuboid box, etc.

[0214] In battery 100, there can be one or more battery cells 102. If there are multiple battery cells 102, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 102 are connected in both series and parallel configurations. Multiple battery cells 102 can be directly connected in series, in parallel, or in a mixed configuration, and then the whole assembly of multiple battery cells 102 is housed in housing 101. Alternatively, multiple battery cells 102 can first be connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed configuration to form a whole assembly, which is then housed in housing 101. In some embodiments, multiple battery cells 102 can be electrically connected through a busbar component to achieve parallel, series, or mixed configurations of multiple battery cells 102.

[0215] Please refer to Figure 3, which is a schematic diagram of the structure of a battery cell 102 provided in some embodiments of this application. The battery cell 102 is in the form of a cuboid. The height direction of the battery cell 102 is the first direction F1, the thickness direction of the battery cell 102 is the second direction F2, and the width direction of the battery cell 102 is the third direction F3. The first direction F1, the second direction F2, and the third direction F3 are all perpendicular to each other.

[0216] Please refer to Figures 4-7. Figure 4 is a cross-sectional view of the battery cell 102 provided in some embodiments of this application. Figure 5 is a partial enlarged view of Figure 4. Figure 6 is a top view of the battery cell 102 provided in some embodiments of this application. Figure 7 is a cross-sectional view along line AA in Figure 6.

[0217] Referring to Figure 4, the battery cell 102 may include a housing component 1, a terminal component 2, and an electrode component 3.

[0218] Referring to Figures 4 and 5, the terminal post 2 is mounted on the housing component 1. Exemplarily, the housing component 1 has a receiving cavity 13. The housing component 1 includes a first housing wall 111, which forms the receiving cavity 13. The first housing wall 111 has a mounting hole 112, and the terminal post 2 is mounted on the first housing wall 111 and located at the mounting hole 112. Here, "the terminal post 2 is mounted on the first housing wall 111" means that the terminal post 2 and the first housing wall 111 have an assembly connection relationship, such as welding or riveting. Therefore, the housing component 1 and the terminal post 2 are separate components, assembled together. This allows for the separate processing of the housing component 1 and the terminal post 2, facilitating their processing and the manufacturing of the battery cell 102.

[0219] Referring to Figures 4 and 5, the electrode component 3 is housed within the housing component 1. Exemplarily, the electrode component 3 includes an active material coating portion 32 and a tab portion 33. The active material coating portion 32 is housed within the receiving cavity 13, and the tab portion 33 is connected to the active material coating portion 32. The electrode component 3 includes one or more electrode assemblies 31. The portion of the electrode assembly 31 coated with an active material layer forms the active material coating portion 32, and the portion without an active material layer forms the tab portion 33. The tab portion 33 includes multiple layers of tab sheets 311.

[0220] The electrode post 2 and the first housing wall 111 are located on the same side of the electrode post 3. That is, the electrode post 2 is located on the side where the first housing wall 111 is located, so that the electrode post 2 can be installed in the mounting hole 112 of the first housing wall 111. For example, when the first housing wall 111 is above the electrode post 3, the electrode post 2 is also above the electrode post 3; when the first housing wall 111 is below the electrode post 3, the electrode post 2 is also below the electrode post 3; when the first housing wall 111 is on the side of the electrode post 3, the electrode post 2 is also on the same side of the electrode post 3.

[0221] For example, the housing component 1 can be surrounded by multiple walls facing different directions, one of which is a first housing wall 111. The projection plane perpendicular to the through direction of the mounting hole 112 is used as the projection plane. The orthographic projection of the mounting hole 112 on this projection plane falls entirely within the range of the orthographic projection of the first housing wall 111 on the same projection plane, and the orthographic projection area of ​​the mounting hole 112 is smaller than the orthographic projection area of ​​the first housing wall 111. One or more mounting holes 112 can be provided on the first housing wall 111 to meet the installation requirements of one or more pole post components 2.

[0222] Referring to Figures 5 and 7, electrode component 3 is connected to terminal component 2. Electrode component 3 is connected to terminal component 2 via conductive portion 4. Terminal component 2 includes terminal body 21, and active material coating portion 32 is connected to terminal body 21 via conductive portion 4, forming electrical conductivity. Exemplarily, battery 100 includes a current-collecting component located outside battery cell 102, and terminal body 21 is connected to the current-collecting component to form electrical conductivity, thereby allowing multiple battery cells 102 to be connected via the current-collecting component.

[0223] For example, when the electrode post 2 is the negative electrode, the electrode post body 21 can be a copper-aluminum composite component, wherein the copper-aluminum composite component can include an aluminum part and a copper part. The aluminum part is located on the side of the copper part away from the active material coating part 32, and can easily form a reliable connection with the aluminum busbar component. The copper part can easily connect with the copper foil material tab of the negative electrode. When the electrode post 2 is the positive electrode, the electrode post body 21 can be an aluminum component. The aluminum component can easily form a reliable connection with the aluminum busbar component, and the aluminum component can also easily connect with the aluminum foil material tab of the positive electrode.

[0224] The connection method between the conductive part 4 and the electrode component 2 is not limited, and may include, but is not limited to, ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure welding, brazing, bonding, etc.

[0225] For example, referring to Figure 5, the conductive part 4 may include both a tab 33 and a conductive element 41 connected to the tab 33. The tab 33 is indirectly connected to the electrode post body 21 through the conductive element 41. The conductive element 41 may be part of the electrode component 3, or it may be part of the electrode post component 2, or it may be independent of both the electrode component 3 and the electrode post component 2.

[0226] Therefore, by indirectly connecting the tab 33 and the pole body 21 through the conductive element 41, the length of the tab 33 can be shortened, and problems such as wrinkling, bending and breakage of the tab 311 can be improved. Furthermore, by flexibly designing the shape and material of the conductive element 41, the connection difficulty with the pole body 21 can be reduced, and the connection convenience between the conductive element 41 and the pole body 21 can be improved.

[0227] For example, referring to Figure 7, the conductive part 4 includes a tab 33, and is connected to the electrode body 21 through the tab 33. That is, the conductive element 41 is not required, and the tab 33 can be directly connected to the electrode body 21. Thus, the use of the conductive element 41 can be eliminated, and the connection process between the conductive element 41 and the tab 33 can be eliminated.

[0228] An insulating material is provided between the pole body 21 and the first housing wall 111 to achieve insulation between the first housing wall 111 and the pole body 21, thereby preventing the first housing wall 111 from becoming charged. For example, the insulating material can be a part of the pole component 2 (e.g., the insulating sealing structure 23) and is insulated from the pole body 21.

[0229] The structure of housing component 1 is not limited. For example, housing component 1 includes a shell body 11 that helps to form the receiving cavity 13, one end of the shell body 11 having an opening 113, and the end of the shell body 11 opposite to the opening 113 being a first shell wall 111. For another example, referring to Figures 8-10, Figure 8 is a structural schematic diagram of the electrode post component provided in some embodiments of this application; Figure 9 is an exploded view of a battery cell provided in some embodiments of this application; Figure 10 is a cross-sectional view of the electrode post component shown in Figure 9; housing component 1 includes a shell cover 12 that helps to form the receiving cavity 13, and the shell cover 12 is the first shell wall 111. Therefore, the structural design of housing component 1 is flexible, and the placement of electrode post component 2 is flexible.

[0230] When the cover 12 is the first shell wall 111, for example, referring to Figures 6 and 7, the shell component 1 may include a shell body 11 and a cover 12. One end of the shell body 11 has an opening 113, and the cover 12 is closed on the opening 113. The shell body 11 and the cover 12 together form a receiving cavity 13, and the cover 12 serves as the first shell wall 111. Alternatively, for example, the shell component 1 may include a shell body 11 and two covers 12. Both ends of the shell body 11 have openings 113, and each opening 113 is covered by a cover 12. The two covers 12 and the shell body 11 together form a receiving cavity 13, and one of the covers 12 serves as the first shell wall 111.

[0231] When the end of the shell 11 opposite to the opening 113 is the first shell wall 111, for example, referring to Figures 4 and 5, the shell component 1 may include a shell 11 and a shell cover 12. One end of the shell 11 has an opening 113, and the shell cover 12 covers the opening 113. The shell 11 and the shell cover 12 together form a receiving cavity 13, and the end of the shell 11 opposite to the opening 113 serves as the first shell wall 111. Alternatively, for example, the shell component 1 may include two shells 11, each shell 11 having an opening 113 at one end. The openings 113 of the two shells 11 are opposite to each other and cover each other. The two shells 11 together form a receiving cavity 13, and the end of one shell 11 opposite to the opening 113 serves as the first shell wall 111.

[0232] In some embodiments of this application, referring to Figures 4 and 5, the housing component 1 includes a shell body 11 that participates in forming a receiving cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111. It is understood that the shell body 11 is a single piece, that is, the shell body 11 is a single molded part, and includes a first shell wall 111 and a second shell wall 114. The second shell wall 114 surrounds the edge of the first shell wall 111, and the second shell wall 114 extends from the edge of the first shell wall 111 toward one side in the thickness direction of the first shell wall 111. The end of the second shell wall 114 opposite to the first shell wall 111 defines the opening 113, and a cavity is defined between the first shell wall 111 and the second shell wall 114, the cavity constituting at least a portion of the receiving cavity 13.

[0233] When the housing component 1 includes a housing body 11 with an opening 113 at one end, the housing component 1 also includes a mating shell. The mating shell mates with the housing body 11 to cover the opening 113 and together with the housing body 11, forms a receiving cavity 13. For example, the housing body 11 is a single piece and is semi-closed cylindrical, while the mating shell is flat, i.e., the mating shell can be a cover 12. In this case, the housing component 1 can be a combination of the housing body 11 and the cover 12. Or, for example, the housing body 11 is semi-closed cylindrical, and the mating shell can also be semi-closed cylindrical. In this case, the housing component 1 can be a combination of two semi-closed cylindrical openings. Thus, the housing component has diverse forms and can adapt to various application scenarios.

[0234] In the above technical solution, since the electrode component 3 housed in the housing component 1 is connected to the terminal component 2 installed on the first housing wall 111, when the battery 100 vibrates or deforms, the terminal components 2 connected by the busbar component will pull on each other. Since the terminal component 2 is set on the end wall opposite to the opening 113 of the housing body 11, the force on the terminal component 2 will be preferentially transmitted to the housing body 11, and will not directly act on the mating shell (e.g., the shell cover 12). This not only extends the distance of force transmission to the connection between the housing body 11 and the mating shell (e.g., the shell cover 12), but also causes the housing body 11 to deform preferentially when subjected to force, thereby reducing the force on the connection between the housing body 11 and the mating shell (e.g., the shell cover 12). This can effectively reduce the probability of cracking at the connection between the housing body 11 and the mating shell (e.g., the shell cover 12) during the use of the battery 100, and improve the reliability of the battery cell 102. Furthermore, since the connection between the casing 11 and the mating shell (e.g., the cover 12) is less prone to cracking, there is no need to increase the wall thickness of either component to improve the reliability of the connection. This helps reduce weight and material costs, and facilitates the miniaturization of the battery cell 102 or increases its energy density. The connection method between the casing 11 and the mating shell is not limited; for example, it can be bonding, welding, etc.

[0235] For example, when the end wall of the housing 11 opposite to the opening 113 serves as the first housing wall 111 for mounting the terminal post component 2, if the terminal post component 2 is first installed in the mounting hole 112 of the first housing wall 111 and then the electrode component 3 is installed into the housing 11, it is difficult to connect the electrode component 3 and the terminal post component 2. In some embodiments of this application, 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. This satisfies the connection requirements between the electrode component 3 and the terminal post component 2, as well as the connection requirements between the terminal post component 2 and the housing component 1, thereby improving the reliability and manufacturability of the battery cell 102. Moreover, this processing sequence allows the length of the conductive part 4 to be effectively shortened. For example, as long as the electrode component 3 and the terminal component 2 are connected first, and the terminal component 2 is connected to the housing component 1 later, the material and cost of the conductive part 4 can be saved, the redundancy of the conductive part 4 can be reduced, the risk of short circuit can be reduced, and the space occupied by the conductive part 4 in the housing component 1 can be reduced, which is beneficial to improving the energy density of the battery cell 102.

[0236] The material of the housing component 1 is not limited, including but not limited to aluminum shell, steel shell, aluminum-plastic film, plastic or other materials resistant to electrolyte corrosion.

[0237] Please refer to Figures 8-10. In some embodiments of this application, the electrode component 2 includes an electrode body 21, a transition structure 22, and an insulating sealing structure 23. The transition structure 22 surrounds the electrode 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 electrode body 21. The electrode body 21 is connected to the electrode component 3.

[0238] The adapter structure 22 surrounds the entire circumference of the terminal body 21 along the mounting hole 112, thereby connecting the terminal body 21 and the first shell wall 111 in the outer peripheral area of ​​the terminal body 21. The insulating and sealing structure 23 insulates the adapter structure 22 from the terminal body 21 and seals the mating position of the adapter structure 22 and the terminal 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 leakage from the mating position of the adapter structure 22 and the terminal body 21 to the outside of the shell component 1, and reducing the risk of liquids or dust from outside the shell component 1 entering the shell component 1 from the mating position of the adapter structure 22 and the terminal body 21, thereby improving the reliability of the battery cell 102.

[0239] The connection method between the adapter structure 22 and the first shell wall 111 is not limited, such as welding, riveting, drilling, bonding, etc. In addition, the connection between the electrode body 21 and the electrode component 3 can be that the electrode component 3 is connected to the electrode body 21 through the conductive part 4. The connection method between the conductive part 4 and the electrode body 21 is not limited, such as welding, riveting, drilling, bonding, etc.

[0240] In summary, when the housing component 1 includes a first housing wall 111 with a mounting hole 112 formed thereon; the electrode component 3 is housed within the housing component 1; the electrode post component 2 is located on the same side of the electrode component 3 as the first housing wall 111 and is installed at the mounting hole 112; the electrode post component 2 includes an electrode post body 21, a connecting structure 22, and an insulating sealing structure 23; the electrode post body 21 is connected to the electrode component 3; the connecting structure 22 surrounds the electrode post body 21 and is connected to the first housing wall 111; and the insulating sealing structure 23 is insulatingly and sealingly fitted between the connecting structure 22 and the electrode post body 21, since the electrode post component 2 includes not only the electrode post body 21 connected to the electrode component 3 but also the connecting structure 22 connected to the first housing wall 111, and the insulating sealing structure 23 is provided between the connecting structure 22 and the electrode post body 21, the connection between the electrode post body 21 and the connecting structure 22 serves to insulate and seal, thus ensuring the electrode post component 2... The self-sealing property facilitates the installation and mating of the terminal post 2 and the housing 1, saving installation time and costs. On the other hand, when the terminal post body needs to press against the sealing element placed on the first housing wall to achieve the sealing of the battery cell, the pressure applied by the terminal post to the first housing wall needs to be relatively large in order to ensure the pre-tightening force required for the seal. When the housing thickness is thin, it is easy to cause deformation or damage to the first housing wall. Therefore, with this configuration, when installing the terminal post 2 onto the first housing wall 111, there is no need to consider insulation and sealing issues between the adapter structure 22 and the first housing wall 111. Only a reliable connection around the entire circumference is required (for example, the adapter structure 22 and the first housing wall 111 can be made of the same material and welded together). Therefore, it is not necessary to apply a large force to the terminal post 2 to meet the sealing requirements at the connection between the adapter structure 22 and the first housing wall 111, thereby improving the stress deformation problem of the first housing wall 111. This facilitates a reduction in the wall thickness of the first shell wall 111, lowering material costs and the weight of the battery cell 102, enabling lightweight production and increasing energy density. Furthermore, when the first shell wall 111 is the end of the shell body 11 opposite the opening 113, it reduces the stress at the connection between the first shell wall 111 and the second shell wall 114, as well as the stress on the second shell wall 114. This improves the reliability of the shell body 11, reduces its wall thickness and cost, and further reduces the weight of the battery cell 102, achieving lightweight production.

[0241] For example, the airtightness of the pole component 2 can be tested when the pole component 2 is received or after the pole component 2 is processed, in order to determine whether the connection position between the adapter structure 22 and the pole body 21 forms a reliable seal. If the seal is reliable, the pole component 2 can be connected to the first shell wall 111.

[0242] The shapes of the adapter structure 22 and the pole body 21 are not limited. For example, either one can be processed into a circle, ellipse, rectangle, or rectangle with R-angle.

[0243] Please refer again to Figures 8-10. In some embodiments of this application, the insulating sealing structure 23 includes a sealing structure 231, wherein the sealing structure 231 is made of a material that has both sealing and insulating properties, such as an elastic rubber component. Thus, the required sealing requirements can be met by designing the shape and position of the sealing structure 231.

[0244] Please refer again to Figures 8-10. In some embodiments of this application, at least a portion of the sealing structure 231 is clamped between the adapter structure 22 and the pole body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111.

[0245] In the embodiments of this application, the directions from the inner side to the outer side of the first shell wall 111, and the directions from the outer side to the inner side of the first shell wall 111, are collectively referred to as "the inner and outer directions of the first shell wall 111 (e.g., the fifth direction F5)". "The inner side of the first shell wall 111" refers to the side of the first shell wall 111 closest to the electrode component 3 (or the side closest to the active material coating portion 32), and "the outer side of the first shell wall 111" refers to the side of the first shell wall 111 away from the electrode component 3 (or the side away from the active material coating portion 32).

[0246] Referring again to Figure 10, the sealing structure 231 includes at least a axial side portion 231a. The side of the axial side portion 231a closest to the receiving cavity 13 is the inner side of the axial side portion 231a, and the side of the axial side portion 231a away from the electrode component 3 is the outer side of the axial side portion 231a. One of the transition structure 22 and the electrode body 21 is partially clamped on the outer side of the axial side portion 231a, and the other is partially clamped on the inner side of the axial side portion 231a. Thus, the axial side portion 231a is clamped between the transition structure 22 and the electrode body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111 to achieve an axial seal between the transition structure 22 and the electrode body 21.

[0247] Therefore, by setting at least a portion of the sealing structure 231 to be clamped between the adapter structure 22 and the electrode body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111, an axial seal is achieved between the adapter structure 22 and the electrode body 21. The axial seal provides a more reliable sealing effect and improves the electrolyte leakage problem at the mating position of the adapter structure 22 and the electrode body 21. In addition, if the electrode component only includes the electrode body, and an axial seal is provided between the electrode body and the first shell wall, sealing pressure needs to be applied along the axial direction of the mounting hole, which will lead to excessive stress on the first shell wall. However, the embodiments of this application integrate the axial seal (such as the axial side portion 231a) into the electrode component, which can reduce the axial force on the first shell wall 111, improve the reliability of the first shell wall 111, and also appropriately thin the first shell wall 111 to reduce costs and increase energy density.

[0248] Please refer again to Figure 10. In some embodiments of this application, the sealing structure 231 is circumferentially disposed around the periphery of the adapter structure 22 near the pole body 21. In the embodiments of this application, since the adapter structure 22 is disposed around the pole body 21 and connected to the first shell wall 111, the periphery of the adapter structure 22 near the pole body 21 is the "inner ring portion 2211 of the adapter structure 22", and the periphery of the adapter structure 22 near the first shell wall 111 is the "outer ring portion 2212 of the adapter structure 22". Therefore, the sealing structure 231 being circumferentially disposed around the periphery of the adapter structure 22 near the pole body 21 can be understood as: the sealing structure 231 extends around the entire circumference of the inner ring portion of the adapter structure 22, and the sealing structure 231 can be located in the annular hole area and / or axial side area (axial side refers to both sides in the direction of penetrating the annular hole) of the inner ring portion of the adapter structure 22, so as to realize that the sealing structure 231 is circumferentially disposed around the periphery of the adapter structure 22 near the pole body 21.

[0249] In the above technical solution, by circumferentially placing the sealing structure 231 around the inner ring of the transition structure 22, the sealing structure 231 can achieve a sealing effect throughout the entire circumference. Moreover, its placement is close to the mating position between the transition structure 22 and the pole body 21, which facilitates sealing the mating position between the transition structure 22 and the pole body 21 through a shorter path, thereby improving the reliability of the seal. Furthermore, it helps to reduce the size of the sealing structure 231, reduce the sealing area, and make it easier to achieve compression sealing, thus reducing the likelihood of seal failure and improving the sealing effect.

[0250] Please refer again to Figure 10. In some embodiments of this application, the pole body 21 includes a peripheral portion 212. The transition structure 22 is clamped on both sides of the peripheral portion 212 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111 by an insulating sealing structure 23. The sealing structure 231 extends around the circumference of the peripheral portion 212 and is clamped between the peripheral portion 212 and the transition structure 22.

[0251] In this embodiment, the peripheral portion 212 can be the outer peripheral structure of the electrode body 21. The side of the peripheral portion 212 away from the electrode component 3 is the outer side of the peripheral portion 212, and the side of the peripheral portion 212 near the receiving 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 (e.g., the first portion 2311 of the sealing structure 231 shown in FIG. 10) is clamped on the side of the peripheral portion 212 near the receiving 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.

[0252] The adapter structure 22 is limited to the outside of the peripheral portion 212 by the insulating sealing structure 23 to restrict the movement of the electrode body 21 relative to the adapter structure 22 toward the direction away from the electrode component 3. The adapter structure 22 is also limited to the inside of the peripheral portion 212 by the insulating sealing structure 23 to restrict the movement of the electrode body 21 relative to the adapter structure 22 toward the receiving cavity 13. Thus, the adapter structure 22 is clamped on both sides of the peripheral portion 212 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111 by the insulating sealing structure 23.

[0253] In the above technical solution, the pole component 2 has a simple structure and is easy to process, which can easily and effectively achieve the relative fixation and insulating fit between the pole body 21 and the adapter structure 22. The sealing structure 231 is clamped between the peripheral portion 212 of the pole body 21 and the adapter structure 22, 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 with a shorter path, improving the reliability of the seal. Furthermore, it helps to reduce the size of the sealing structure 231, reduce the sealing area, and easily achieve compression sealing, making the seal less prone to failure and improving the sealing effect.

[0254] Referring again to Figure 10, by way of example, at least a portion of the sealing structure 231 is disposed on the side of the peripheral portion 212 that is close to or away from the electrode component 3. That is, the sealing structure 231 includes an axial portion 231a, which is disposed on the side of the peripheral portion 212 that is close to or away from the electrode component 3, so as to be clamped between the peripheral portion 212 and the transition structure 22 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111.

[0255] In the embodiments of this application, "the side closer to the electrode component 3" refers to the side closer to the active material coating portion 32, or the side closer to the receiving 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.

[0256] When the axial side portion 231a is provided on the side of the peripheral portion 212 near the electrode component 3, the peripheral portion 212 is clamped on the outside 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 near the receiving 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 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111.

[0257] When the axial side portion 231a is located 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 receiving 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 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111.

[0258] Therefore, the axial seal between the adapter structure 22 and the electrode body 21 can achieve a relatively reliable sealing effect. If the electrode component only includes the electrode body, and an axial seal is provided between the electrode body and the first housing wall, sealing pressure needs to be applied along the axial direction of the mounting hole, which would result in excessive stress on the first housing wall. However, the embodiments of this application integrate the axial seal (such as the axial side portion 231a) into the electrode component, which can reduce the axial force on the first housing wall 111. In addition, when at least a portion of the sealing structure 231 is provided on the side of the peripheral portion 212 near the electrode component 3, sealing can be performed from the side of the peripheral portion 212 near the receiving cavity 13, which can more effectively suppress electrolyte leakage from the mating position between the electrode body 21 and the adapter structure 22, thereby improving the sealing effect.

[0259] Referring again to Figure 10, exemplarily, the insulating sealing structure 23 further includes a first insulating member 232. The transition structure 22 is clamped to both sides of the peripheral portion 212 along the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111 via the first insulating member 232 and the sealing structure member 231. In this embodiment, the configuration of the transition structure 22 is not limited; it can be a single component or a combination of multiple components (e.g., two or more).

[0260] When at least a portion of the sealing structure 231 (such as the axial portion 231a) is provided on the side of the peripheral portion 212 near the electrode component 3, at least a portion of the first insulating member 232 is provided on the side of the peripheral portion 212 away from the electrode component 3, and the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the first insulating member 232 and the sealing structure 231 respectively.

[0261] When at least a portion of the sealing structure 231 (such as the axial portion 231a) is provided 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 provided on the side of the peripheral portion 212 close to the electrode component 3, and the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the first insulating member 232 and the sealing structure 231 respectively.

[0262] In the above technical solution, since the insulating sealing structure 23 includes a first insulating component 232 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulating sealing structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the first insulating component 232 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. In addition, when the first insulating component 232 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0263] Alternatively, please refer to Figure 11, which is a cross-sectional view of the pole member provided in some embodiments of this application. In some other embodiments of this application, the sealing structure 231 is an integral structure and is surrounded by a peripheral portion 212, located on the side of the peripheral portion 212 near the electrode member 3 and the side away from the electrode member 3, respectively. The adapter structure 22 can be clamped on both sides of the peripheral portion 212 by the sealing structure 231 along the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111. In this embodiment, the configuration of the adapter structure 22 is not limited; it can be a single part or a combination of multiple parts (e.g., two or more).

[0264] 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 a peripheral side portion 231b located on the outer periphery of the peripheral portion 212. In this way, the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure and is wrapped around the peripheral portion 212, the number of parts and assembly processes can be reduced.

[0265] Please refer again to Figures 8-10. In some embodiments of this application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is disposed on the side of the first adapter ring 221 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 welded, riveted, drilled, or bonded together. For example, the outer ring portion of one of the first adapter ring 221 and the second adapter ring 222 can be welded, riveted, drilled, or bonded together to the first shell wall 111.

[0266] The end of the first adapter ring 221 near 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 near the pole body 21 (i.e., the inner ring portion of the second adapter ring 222) are spaced apart along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111, so as to be clamped on both sides of the peripheral portion 212 by the insulating sealing structure 23 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111, 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.

[0267] That is, the second adapter ring 222 is disposed on the inner or outer side of the first adapter ring 221, and the inner ring portion of the first adapter ring 221 and the inner ring portion of the second adapter ring 222 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 portion 231a clamped between the inner ring portion of the first adapter ring 221 and the peripheral portion 212 in the inward and outward direction (e.g., the fifth direction F5) of the first housing wall 111, and / or an axial portion 231a clamped between the inner ring portion of the second adapter ring 222 and the peripheral portion 212 in the inward and outward direction (e.g., the fifth direction F5) of the first housing wall 111.

[0268] For example, referring to Figure 10, the second adapter ring 222 is located on the side of the first adapter ring 221 away from the electrode component 3 (i.e., the second adapter ring 222 is located on the outside of the first adapter ring 221). In this case, the inner ring portion of the second adapter ring 222 is clamped on the outside of the peripheral portion 212 by the insulating sealing structure 23, and the inner ring portion of the first adapter ring 221 is clamped on the inside of the peripheral portion 212 by 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 adapter ring 221 and the peripheral portion 212, or it can be clamped between the inner ring portion of the second adapter ring 222 and the peripheral portion 212.

[0269] For example, the second adapter ring 222 is located on the side of the first adapter ring 221 near the electrode component 3 (i.e., the second adapter ring 222 is located inside the first adapter ring 221). In this case, the inner ring portion of the second adapter ring 222 is clamped to the inner side of the peripheral portion 212 by the insulating sealing structure 23, and the inner ring portion of the first adapter ring 221 is clamped to the outer side of the peripheral portion 212 by the insulating sealing structure 23. In this case, the sealing structure 231 in the insulating sealing structure 23 can be clamped between the inner ring portion of the first adapter ring 221 and the peripheral portion 212, or it can be clamped between the inner ring portion of the second adapter ring 222 and the peripheral portion 212.

[0270] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 that are arranged internally and externally and assembled together, which facilitates the assembly and connection of the adapter structure 22 with the insulating sealing structure 23 and the pole body 21, making the pole component 2 easy to process and manufacture, and making it easy to control the compression of the sealing structure component 231, thereby improving the sealing reliability.

[0271] For example, both the first adapter ring 221 and the second adapter ring 222 are made of aluminum and are welded together. The first adapter ring 221 and the first shell wall 111 are both made of aluminum and are welded together, which helps to improve the welding yield.

[0272] Please refer again to Figures 8-10. In some embodiments of this application, the insulating sealing structure 23 further includes a first insulating member 232. At least a portion of the sealing structure member 231 is sandwiched between the first transition ring 221 and the peripheral portion 212. The second transition ring 222 is insulated from and fixedly fitted to the peripheral portion 212 through the first insulating member 232.

[0273] Referring to Figure 10, the sealing structure 231 extends around the entire circumference of the inner ring portion of the first transition ring 221 to be clamped between the inner ring portion of the first transition ring 221 and the peripheral portion 212. The second transition ring 222 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232. Exemplarily, the sealing structure 231 may include an axial portion 231a clamped between the inner ring portion of the first transition ring 221 and the peripheral portion 212 in the inward or outward direction (e.g., the fifth direction F5) of the first housing wall 111.

[0274] In the above technical solution, since the insulating sealing structure 23 includes a first insulating component 232 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulating sealing structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the first insulating component 232 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. Moreover, when the first insulating component 232 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0275] The method by which the second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232 is not limited.

[0276] For example, referring again to Figures 8-10, when the sealing structure 231 is clamped between the first transition 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 transition ring 222, can be injection molded to connect them respectively.

[0277] For example, the first insulating member 232 is an injection-molded part, and it is injection-molded together with the pole body 21 and the second adapter ring 222. Thus, the pole body 21 and the second adapter ring 222 can be insulated from and fixedly fitted together by the first insulating member 232. For example, when processing the pole component 2, the pole body 21 and the second adapter ring 222 can be injection-molded together first, then the sealing structure 231 and the first adapter ring 221 can be assembled, and then the first adapter ring 221 and the second adapter ring 222 can be connected (e.g., welded), and the sealing structure 231 can be pressed tightly.

[0278] Therefore, the electrode component 2 is easy to process, and a reliable connection and insulation fit between the adapter structure 22 and the electrode body 21 can be achieved.

[0279] For example, please refer to Figure 12, which is a cross-sectional view of the pole member provided in some embodiments of this application; when the sealing structure 231 is clamped between the first transition ring 221 and the peripheral portion 212, the second transition ring 222 may include a stop ring portion 2221, and at least a portion of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 along the inward and outward directions (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, for example, it may be a plastic part or an elastic rubber part.

[0280] Therefore, by connecting the second adapter ring 222 to the first adapter ring 221, the first insulating member 232 can be clamped by the stop ring portion 2221 and the peripheral portion 212 of the second adapter ring 222, thereby eliminating the need for the injection molding process.

[0281] In some embodiments of this application, the first insulating member 232 may not be provided. For example, referring to FIG11, the sealing structure member 231 is an integral structure member and is surrounded by a peripheral portion 212, which is located on the side of the peripheral portion 212 near the electrode member 3 and the side away from the electrode member 3, respectively. The first transition ring 221 and the second transition ring 222 are respectively clamped on the two sides of the sealing structure member 231 away from the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111.

[0282] That is, the sealing structure 231 is an integral ring structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the peripheral portion 212, and the axial side portions 231a on the inner and outer sides of the peripheral portion 212 are connected by axial side portions 231b located on the periphery of the peripheral portion 212. In this way, one of the first transition ring 221 and the second transition 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.

[0283] In the above technical solution, since the sealing structure 231 is an integral structure and has an outer periphery 212, the number of parts and assembly processes can be reduced.

[0284] Please refer again to Figures 10-12. In some embodiments of this 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 away from the electrode component 3, that is, the second adapter ring 222 is disposed on the outside of the first adapter ring 221. At least a portion of the sealing structure 231 is sandwiched 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 component 232 and the sealing structure 231, or the sealing structure 231 can be an integral structure with the peripheral portion 212 enclosing it.

[0285] Therefore, sealing can be achieved from the side of the peripheral portion 212 near the receiving cavity 13, which can more effectively suppress electrolyte leakage from the mating position between the electrode body 21 and the transition structure 22, thereby improving the sealing effect. Moreover, with this structure, the relative positions of each part of the electrode component 2 and the first shell wall 111 can be determined by the structural design of the first transition ring 221, so that it can be flexibly designed as needed to reduce the space occupied by the electrode component 2 inside or outside the shell component 1.

[0286] For example, when 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 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 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111. That is, the sealing structure 231 includes an axial side portion 231a clamped between the peripheral portion 212 and the first adapter ring 221 in the inward and outward directions, thereby achieving the effect of axial sealing.

[0287] Please refer again to Figure 10. In some embodiments of this application, the first adapter ring 221 and the second adapter ring 222 are both metal rings and welded together, and the first adapter ring 221 is welded to the first shell wall 111. Thus, the adapter structure 22 has good structural strength and is suitable for connection with the metal first shell wall 111.

[0288] Referring again to Figure 10, the adapter structure 22, by way of example, further includes a first insulating frame 224, which is connected to the side of the first adapter ring 221 near the electrode component 3. Thus, the first insulating frame 224 can serve as insulation between the electrode component 3 and the first adapter ring 221, reducing the difficulty of setting up an insulating sealing structure here. By way of example, the first insulating frame 224 has a pin, and the first adapter ring 221 has a hole; the pin is interference-fitted into the hole to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0289] Please refer again to Figures 10-12. In some embodiments of this application, the surface of the first adapter ring 221 near the second adapter ring 222 has a first annular groove 2213 that matches 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 part of the second adapter ring 222, and at least a portion of the second adapter ring 222 is recessed into the first annular groove 2213. For example, the thickness of the recessed portion can be equal to, slightly larger than, or slightly smaller than the groove depth of the first annular groove 2213.

[0290] For example, when the second adapter ring 222 is located outside the first adapter ring 221, the surface of the first adapter ring 221 facing away from the electrode component 3 (i.e., the outer surface) has a first annular groove 2213. As another example, when the second adapter ring 222 is located inside the first adapter ring 221, the surface of the first adapter ring 221 closest to the electrode component 3 (i.e., the inner surface) has a first annular groove 2213.

[0291] Therefore, by setting the first annular groove 2213, the second adapter ring 222 can be positioned, which facilitates the improvement of the assembly efficiency and connection reliability of the first adapter ring 221 and the second adapter ring 222.

[0292] Please refer to Figure 13, which is a cross-sectional view of the pole post component provided in some embodiments of this application. In some embodiments of this application, the adapter structure 22 includes a third adapter ring 223, which includes an integrally formed first extension 2231 and a second extension 2232. That is, the first extension 2231 and the second extension 2232 are different parts of a single integral component, rather than two separate parts assembled together. The connection method between the third adapter ring 223 and the first shell wall 111 is not limited, for example, it can be welded, riveted, drilled, glued, etc.

[0293] The end of the first extension 2231 near the pole body 21 (i.e., the inner ring portion of the first extension 2231) and the end of the second extension 2232 near the pole body 21 (i.e., the inner ring portion of the second extension 2232) are spaced apart in the inward and outward directions, respectively, by the insulating sealing structure 23 along the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111, and the sealing structure 231 is sandwiched between at least one of the first extension 2231 and the second extension 2232 and the peripheral portion 212.

[0294] That is, the first extension 2231 and the second extension 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 2231 and the peripheral portion 212 in the inward and 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 extension 2232 and the peripheral portion 212 in the inward and outward direction (e.g., the fifth direction F5) of the first shell wall 111.

[0295] For example, referring to Figure 13, the second extension 2232 is located on the side of the first extension 2231 away from the electrode component 3 (i.e., the second extension 2232 is located on the outside of the first extension 2231). In this case, the inner ring portion of the second extension 2232 is clamped on the outside of the peripheral portion 212 by the insulating sealing structure 23, and the inner ring portion of the first extension 2231 is clamped on the inside of the peripheral portion 212 by 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 2231 and the peripheral portion 212, or it can be clamped between the inner ring portion of the second extension 2232 and the peripheral portion 212.

[0296] For example, the second extension 2232 is located on the side of the first extension 2231 near the electrode component 3 (i.e., the second extension 2232 is located inside the first extension 2231). In this case, the inner ring portion of the second extension 2232 is clamped inside the peripheral portion 212 by the insulating sealing structure 23, and the inner ring portion of the first extension 2231 is clamped outside the peripheral portion 212 by the insulating sealing structure 23. In this case, the sealing structure 231 in the insulating sealing structure 23 can be clamped between the inner ring portion of the first extension 2231 and the peripheral portion 212, or it can be clamped between the inner ring portion of the second extension 2232 and the peripheral portion 212.

[0297] Therefore, since the third adapter ring 223 includes an integrally formed first extension 2231 and second extension 2232, and the first extension 2231 and second extension 2232 are integrated into the same structural component, the process of connecting the first extension 2231 and the second extension 2232 can be eliminated, the use of parts can be reduced, and the first extension 2231 and the second extension 2232 are not easily separated, which can improve the clamping reliability of the peripheral portion 212 through the insulating sealing structure 23.

[0298] For example, 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.

[0299] Please refer again to Figure 13. In some embodiments of this application, the insulating sealing structure 23 further includes a first insulating member 232. At least a portion of the sealing structure member 231 is sandwiched between the first extension 2231 and the peripheral portion 212. The second extension 2232 is insulated from and fixedly engaged with the peripheral portion 212 by the first insulating member 232.

[0300] Referring to Figure 13, the sealing structure 231 extends around the entire circumference of the first extension 2231 to be clamped between the inner ring portion and the peripheral portion 212 of the first extension 2231. The second extension 2232 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232. Exemplarily, the sealing structure 231 may include an axial portion 231a clamped between the inner ring portion and the peripheral portion 212 of the first extension 2231 in the inward or outward direction (e.g., the fifth direction F5) of the first housing wall 111.

[0301] In the above technical solution, since the insulating sealing structure 23 includes a first insulating component 232 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulating sealing structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the first insulating component 232 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. Moreover, when the first insulating component 232 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0302] The way the first insulating member 232 and the second extension 2232 are coupled is not limited.

[0303] For example, referring again to Figure 13, the second extension 2232 rivets the first insulating member 232 against the peripheral portion 212. That is, the second extension 2232 presses the first insulating member 232 tightly through a riveting process, so that the first insulating member 232 is clamped between the peripheral portion 212 and the second extension 2232. This eliminates the need for assembly welding, allowing the third adapter ring 223 to be assembled with the pole body 21 and the insulating sealing structure 23. In this embodiment, the material of the first insulating member 232 is not limited; for example, it can be a plastic part or an elastic rubber part. Exemplarily, when only the second extension 2232 is riveted between the first extension 2231 and the second extension 2232, the sealing structure 231 is clamped between the first extension 2231 and the peripheral portion 212, making it easy to control the compression amount of the sealing structure 231 and achieve a better compression effect.

[0304] Please refer to Figure 14, which is a cross-sectional view of the pole post component provided in some embodiments of this application. In some embodiments of this application, the first insulating member 232 and the pole post body 21, as well as the first insulating member 232 and the second extension 2232 are respectively injection molded. The first extension 2231 rivets the sealing structure member 231 against the peripheral portion 212.

[0305] For example, the first insulating member 232 is an injection-molded part, and it is injection-molded together with the pole body 21 and the second extension 2232. This allows the pole body 21 and the second extension 2232 to be insulated from and fixedly fitted together by the first insulating member 232. When processing the pole component 2, the pole body 21 and the third adapter ring 223 can be injection-molded together first, then the sealing structure 231 can be assembled, and finally the first extension 2231 can be riveted to press the sealing structure 231. This makes the processing of the pole component 2 easy and allows for a reliable connection and insulating fit between the adapter structure 22 and the pole body 21.

[0306] Please refer to Figure 15, which is a cross-sectional view of the pole member provided in some embodiments of this application. In some embodiments of this application, the sealing structure 231 is an integral structure and is surrounded by a peripheral portion 212, which is located on the side of the peripheral portion 212 near the electrode member 3 and on the side away from the electrode member 3, respectively. The first extension portion 2231 and the second extension portion 2232 are respectively clamped on the two sides of the sealing structure 231 away from the peripheral portion 212 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111.

[0307] That is, the sealing structure 231 is an integral ring structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the peripheral portion 212, and the axial side portions 231a on the inner and outer sides of the peripheral portion 212 are connected by circumferential side portions 231b located on the periphery 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.

[0308] In the above technical solution, since the sealing structure 231 is an integral structure and has an outer periphery 212, the number of parts and assembly processes can be reduced.

[0309] Please refer again to Figure 15. In some embodiments of this application, one of the first extension 2231 and the second extension 2232 rivets the sealing structure 231 against the peripheral portion 212.

[0310] That is, the first extension 2231 or the second extension 2232 is pressed into the sealing structure 231 by riveting, so that the first extension 2231 and the second extension 2232 are respectively clamped on both sides of the peripheral part 212 by the sealing structure 231, 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 assembly and welding process.

[0311] Please refer again to Figures 13, 14, and 15. In some embodiments of this application, one of the first extension 2231 and the second extension 2232 is a pre-formed portion 223a, and the other is a riveted portion 223b. For example, when the first extension 2231 is the pre-formed portion 223a, the second extension 2232 is the riveted portion 223b; and for another example, when the second extension 2232 is the pre-formed portion 223a, the first extension 2231 is the riveted portion 223b. The fixed end 223a1 of the pre-formed portion 223a is connected to the first shell wall 111 (e.g., by welding, riveting, drilling, or bonding), and the fixed end 223b1 of the riveted portion 223b is connected to the pre-formed portion 223a. The riveted portion 223b rivets the insulating sealing structure 23 against the peripheral portion 212. Therefore, the third adapter ring 223 can be clamped by the insulating sealing structure 23 to the peripheral part 212 through pre-processing and riveting, thus eliminating the need for assembly and welding processes.

[0312] For example, the preformed part 223a can be processed by stamping, thinning, stretching, bending and other processes. During the assembly of the third transition ring 223 with the insulating sealing structure 23 and the pole body 21, the preformed part 223a no longer deforms, while the riveting forming part 223b deforms relative to the preformed part 223a through riveting, so as to press the insulating sealing structure 23 tightly through riveting, so that the third transition ring 223 can clamp the peripheral part 212 through the insulating sealing structure 23. During the riveting process, the fixed end 223b1 of the riveting forming part 223b is always connected to the preformed part 223a and the relative position remains unchanged.

[0313] Please refer again to Figures 13-17. In some embodiments of this 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 shell wall 111 and is arranged around the riveting forming portion 223b and the inner ring portion 223a3. The inner ring portion 223a3 and the riveting forming 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 an insulating sealing structure 23. The riveting forming portion 223b and the inner ring portion 223a3 are respectively connected to the outer ring portion 223a2. Thus, the structure of the third transition ring 223 is simple and easy to process and manufacture.

[0314] For example, the preformed part 223a includes an outer ring part 223a2 and an inner ring part 223a3. The outer ring portion of the outer ring part 223a2 is connected to the first shell wall 111 (e.g., welded). The fixed end 223b1 of the riveted forming part 223b and the outer ring portion of the inner ring part 223a3 are respectively connected to the inner ring portion of the outer ring part 223a2 (e.g., integrally formed). The inner ring portion of the inner ring part 223a3 and the inner ring portion of the riveted forming part 223b extend close to the inner and outer sides of the peripheral part 212, respectively, and are clamped to the inner and outer sides of the peripheral part 212 by the insulating sealing structure 23.

[0315] For example, referring to FIG13, the inner ring portion of the inner ring portion 223a3 is clamped to 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 riveting forming portion 223b is clamped to the other side of the inner and outer sides of the peripheral portion 212 by the first insulating member 232. For example, referring to FIG14, the inner ring portion of the inner ring portion 223a3 is clamped to one side of the inner and outer sides of the peripheral portion 212 by the first insulating member 232, and the inner ring portion of the riveting forming portion 223b is clamped to the other side of the inner and outer sides of the peripheral portion 212 by the sealing structure 231.

[0316] Please refer to Figures 15 and 16. Figure 16 is a cross-sectional view of the pole post component provided in some embodiments of this application. In some embodiments of this 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 the outer ring portion 223a2 surrounds the riveted forming portion 223b and the bent portion 223a4. The bent portion 223a4 and the riveted forming portion 223b are respectively clamped on both sides of the peripheral portion 212 by an insulating sealing structure 23 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111. The bent portion 223a4 is bent and connected between the riveted forming portion 223b and the outer ring portion 223a2. Thus, the wall thickness and support capacity of the riveted forming portion 223b and the bent portion 223a4 are easily guaranteed, and a good compression and sealing effect can be achieved.

[0317] For example, the preformed part 223a includes an outer ring part 223a2 and a bent part 223a4. The outer ring portion of the outer ring part 223a2 is connected to the first shell wall 111. The bent part 223a4 is connected between the outer ring part 223a2 and the riveting part 223b. The bent part 223a4 extends from the inner ring portion of the outer ring part 223a2 in a direction close to the peripheral portion 212, then folds back in a direction close to the outer ring part 223a2, and extends to connect with the fixed end 223b1 of the riveting part 223b.

[0318] For example, referring to FIG15, the inner ring portion of the bent portion 223a4 and the inner ring portion of the riveting forming portion 223b are respectively clamped to the inner and outer sides of the peripheral portion 212 by the sealing structure 231. As another example, referring to FIG16, the inner ring portion of the bent portion 223a4 is clamped to 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 riveting forming portion 223b is clamped to the other side of the inner and outer sides of the peripheral portion 212 by the first insulating member 232.

[0319] Referring again to Figures 13, 14, 15, and 16, exemplarily, at least a portion of the sealing structure 231 is clamped between the third transition ring 223 and the side of the peripheral portion 212 near the electrode component 3. This allows for sealing from the side of the peripheral portion 212 near the receiving cavity 13, more effectively suppressing electrolyte leakage from the mating position between the electrode body 21 and the transition structure 22, thereby improving the sealing effect.

[0320] For example, the sealing structure 231 includes an axial portion 231a located on the side of the peripheral portion 212 near the electrode component 3 and sandwiched in the inward and outward directions between the peripheral portion 212 and the first extension portion 2231 or the second extension portion 2232, thereby achieving an axial sealing effect.

[0321] For example, referring to Figure 14, the third adapter ring 223 is an integrally formed metal ring, and the third adapter ring 223 is welded to the first shell wall 111. Thus, the third adapter ring 223 has a simple structure, can be constructed with an integrally formed first extension 2231 and second extension 2232, has good structural strength, and is suitable for connection with the metal first shell wall 111.

[0322] Referring to Figure 14, the adapter structure 22, by way of example, 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 serve as insulation between the electrode component 3 and the third adapter ring 223, eliminating the need for an insulating sealing structure. By way of example, the second insulating frame 225 has a pin, and the third adapter ring 223 has a hole; the pin is interference-fitted into the hole to achieve the connection between the second insulating frame 225 and the third adapter ring 223.

[0323] Please refer to Figure 17, which is an exploded view of the processing of the third adapter ring 223 provided in some embodiments of this application. For example, when the adapter structure 22 includes the third adapter ring 223, and the third adapter ring 223 has an inner extension 2231 and an outer extension 2232, the shaping steps of the adapter structure 22 can be as follows: first, a metal plate is provided, then a convex bulge is stamped out on the metal plate, then the periphery outside the convex bulge is thinned to obtain one of the inner extension 2231 and the outer extension 2232, and then a hole is punched at the position of the convex bulge to obtain the other of the inner extension 2231 and the outer extension 2232.

[0324] Please refer to Figure 18, which is an exploded view of the manufacturing process of the pole piece provided in some embodiments of this application. Exemplarily, when the pole piece 2 is manufactured using the third adapter ring 223, the third adapter ring 223 is first manufactured, for example, as shown in Figure 17. Then, the third adapter ring 223 is injection molded to the pole piece body 21 to obtain the first insulating member 232. Next, the sealing structure member 231 is assembled. Then, through a riveting process, the inner extension 2231 presses against the sealing structure member 231. Finally, the second insulating frame 225 is assembled onto the third adapter ring 223. Thus, by shaping the third adapter ring 223, the clamping of the sealing structure member 231 by the peripheral portion 212 and the inner extension 2231 of the adapter structure 22 is completed.

[0325] Referring again to Figure 10, in some embodiments of this application, the sealing structure 231 includes a first portion 2311, which is located on the side of the peripheral portion 212 near the electrode component 3 and is clamped between the peripheral portion 212 and the transition structure 22 along the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111. That is, the axial 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 near the receiving cavity 13). Thus, sealing can be achieved from the side of the peripheral portion 211 near the receiving cavity 13, which can more effectively suppress electrolyte leakage from the mating position of the electrode body 21 and the transition structure 22, thereby improving the sealing effect.

[0326] Please refer again to Figures 10 and 13. By way of example, the pole body 21 includes a body portion 213 and a peripheral portion 212 disposed around the body portion 213. The body portion 213 protrudes relative to the peripheral portion 212 toward the direction of proximity to the electrode component 3 (i.e., closer to the inside, or closer to the electrode component 3). The sealing structure 231 also includes a second portion 2312. The second portion 2312 is connected to one end of the first portion 2311 near the body portion 213 (i.e., the inner ring portion of the first portion 2311) and extends relative to the first portion toward the direction of proximity to the electrode component 3 (i.e., closer to the inside, or closer to the electrode component 3), so that the second portion 2312 is spaced between the outer peripheral surface of the body portion 213 and the transition structure 22.

[0327] Therefore, since the main body portion 213 of the electrode post body 21 protrudes towards the electrode component 3 (i.e., towards the inside, or towards the electrode component 3) relative to the peripheral portion 212, it is beneficial to reduce the space occupied by the electrode post body 21 on the exterior of the housing component 1, and reduce the size of the battery cell 102 in the direction in which the electrode post component 2 is set (e.g., the first direction F1 shown in FIG3). Furthermore, by setting the sealing structure 231 to include a second portion 2312 spaced between the outer peripheral surface of the main body portion 213 and the transition structure 22, insulation at this location can be achieved simply and effectively.

[0328] Referring again to Figure 13, by way of example, the sealing structure 231 further includes a third part 2313, which is connected to one end of the first part 2311 away from the electrode post body 21 (i.e., the outer ring portion of the first part 2311), and extends to the outer peripheral area of ​​the peripheral portion 212 relative to the first part 2311 in the direction away from the electrode component 3 (i.e., close to the outside, or in other words, in the direction away from the electrode component 3), and is sealed between the outer peripheral surface of the peripheral portion 212 and the transition structure 22.

[0329] Therefore, by setting the sealing structure 231 to 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 mating position between the pole body 21 and the transition structure 22 can be further improved, thereby enhancing the sealing effect of the battery cell 102.

[0330] For example, the sealing structure 231 is a one-piece molded part, which facilitates processing and manufacturing, and when the sealing structure 231 includes multiple parts, the connection of the multiple parts is more reliable.

[0331] Referring again to Figure 10, in some embodiments of this application, the adapter structure 22 has a second annular groove 226 that matches 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 part of the sealing structure 231, and at least a portion of the sealing structure 231 is recessed into the second annular groove 226. For example, the thickness of the recessed portion can be equal to, slightly larger than, or slightly smaller than the groove depth of the second annular groove 226. Thus, by providing the second annular groove 226, the sealing structure 231 can be positioned, which facilitates the improvement of the assembly efficiency and installation reliability of the sealing structure 231.

[0332] For example, referring to Figure 10, the second annular groove 226 can be a partially thinned area of ​​the transition structure 22. As another example, referring to Figure 11, the second annular groove 226 can also be a stepped surface formed by a partial bend in the transition structure 22. When the sealing structure 231 includes a first portion 2311 located on the side of the peripheral portion 212 near the electrode component 3 and sandwiched between the peripheral portion 212 and the transition structure 22 in the inward and outward directions, bending the portion of the transition structure 22 (e.g., the first transition ring 221 or the third transition ring 223) located on the side of the first portion 2311 near the electrode component 3 towards the direction near the electrode component 3 to form a sunken stepped surface to construct the second annular groove 226 helps reduce the space occupied by the electrode post body 21 on the exterior of the housing component 1 and reduces the size of the battery cell 102 in the direction where the electrode post component 2 is located (e.g., the first direction F1 shown in Figure 3).

[0333] Please refer to Figures 19 and 20. Figure 19 is a partial cross-sectional view of a battery cell provided in some embodiments of this application; Figure 20 is a schematic diagram of the terminal post component shown in Figure 19. In some embodiments of this application, the adapter structure 22 includes a mating ring portion 2271, the terminal post body 21 includes a through portion 214 passing through the mating ring portion 2271, and a first limiting portion 215 and a second limiting portion 216 connected to the through portion 214 and clamped on both sides of the mating ring portion 2271. The sealing structure 231 extends circumferentially around the mating ring portion 2271 and is clamped between the mating ring portion 2271 and the terminal post body 21.

[0334] 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 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 axial portion 231a. For example, the axial portion 231a is clamped between the mating ring portion 2271 and the first limiting portion 215 in an inward and outward direction; another example, the axial portion 231a is clamped between the mating ring portion 2271 and the second limiting portion 216 in an inward and outward direction; yet another example, the axial portion 231a is clamped between the mating ring portion 2271 and the second limiting portion 216 in an inward and outward direction; and simultaneously, the axial portion 231a is also clamped between the mating ring portion 2271 and the first limiting portion 215 in an inward and outward direction.

[0335] In the above technical solution, the pole piece 2 has a simple structure and is easy to process, which can easily and effectively achieve the relative fixation and insulating fit between the pole piece body 21 and the adapter structure 22. The sealing structure 231 is clamped by the mating position of the pole piece body 21 and the mating ring 2271, so that the sealing structure 231 can be positioned at the mating position between the adapter structure 22 and the pole piece body 21. This facilitates sealing the mating position between the adapter structure 22 and the pole piece body 21 with a shorter path, improving the reliability of the seal. Furthermore, it helps to reduce the size of the sealing structure 231, reduce the sealing area, and easily achieve compression sealing, making the seal less prone to failure and improving the sealing effect.

[0336] Referring again to Figures 19 and 20, by way of example, at least a portion of the sealing structure 231 is disposed on the side of the mating ring portion 2271 near 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 mating ring portion 2271. That is, the sealing structure 231 includes a axial portion 231a, which is disposed on the side of the mating ring portion 2271 near 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 mating ring portion 2271.

[0337] For example, referring to Figures 19 and 20, when the first limiting part 215 is clamped on the side of the mating ring part 2271 near the electrode component 3 (i.e., the inner side), and the second limiting part 216 is clamped on the side of the mating ring part 2271 away from the electrode component 3 (i.e., the outer side), the axial side part 231a can be provided on the side of the mating ring part 2271 near the electrode component 3, the mating ring part 2271 is clamped on the outer side of the axial side part 231a (i.e., the side away from the electrode component 3), and the inner side of the axial side part 231a (i.e., the side near the receiving cavity 13) is clamped by the first limiting part 215, so that the axial side part 231a is clamped between the mating ring part 2271 and the first limiting part 215 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111.

[0338] Alternatively, by way of example, when the first limiting part 215 is clamped on the side of the mating ring part 2271 near the electrode component 3 (i.e., the inner side), and the second limiting part 216 is clamped on the side of the mating ring part 2271 away from the electrode component 3 (i.e., the outer side), the axial side part 231a can be provided on the side of the mating ring part 2271 away from the electrode component 3, the mating ring part 2271 is clamped on the inner side of the axial side part 231a (i.e., the side near the receiving cavity 13), and the outer side of the axial side part 231a (i.e., the side away from the electrode component 3) is clamped by the second limiting part 216, so that the axial side part 231a is clamped between the mating ring part 2271 and the second limiting part 216 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111.

[0339] Alternatively, by way of example, when the first limiting part 215 is clamped on the side of the mating ring part 2271 near the electrode component 3 (i.e., the inner side), and the second limiting part 216 is clamped on the side of the mating ring part 2271 away from the electrode component 3 (i.e., the outer side), the side of the mating ring part 2271 near the electrode component 3 (i.e., the inner side) may be provided with an axial side part 231a, which is clamped between the mating ring part 2271 and the first limiting part 215 along the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111. The side of the mating ring part 2271 away from the electrode component 3 (i.e., the outer side) may also be provided with an axial side part 231a, which is clamped between the mating ring part 2271 and the second limiting part 216 along the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111.

[0340] Therefore, the axial seal between the adapter structure 22 and the electrode body 21 can achieve a relatively reliable sealing effect. If the electrode component only includes the electrode body, and an axial seal is provided between the electrode body and the first housing wall, sealing pressure needs to be applied along the axial direction of the mounting hole, which would result in excessive stress on the first housing wall. However, the embodiment of this application integrates the axial seal (such as the axial side portion 231a) into the electrode component 2, which can reduce the axial force on the first housing wall 111. In addition, when at least a portion of the sealing structure 231 is provided on the side of the mating ring portion 2271 near the electrode component 3, sealing can be performed from the side of the mating ring portion 2271 near the receiving cavity 13, which can more effectively suppress electrolyte leakage from the mating position between the electrode body 21 and the adapter structure 22, thereby improving the sealing effect.

[0341] Please refer again to FIG20. In some embodiments of this application, the insulating sealing structure 23 further includes a second insulating member 234. One of the first limiting portion 215 and the second limiting portion 216 clamps the sealing structure member 231 between the mating ring portion 2271, and the other of the first limiting portion 215 and the second limiting portion 216 clamps the second insulating member 234 between the mating ring portion 2271.

[0342] The mating ring portion 2271 clamps the second insulating member 234 and the sealing structure member 231 on both sides along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111. When the sealing structure member 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 member 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.

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

[0344] Alternatively, please refer to Figure 21, which is a partial cross-sectional view of a battery cell provided in some embodiments of this application; in some other embodiments of this application, the sealing structure 231 may also be an integral structure and surround a mating ring 2271, located on the side of the mating ring 2271 near the electrode component 3 and the side away from the electrode component 3, respectively. The electrode body 21 is clamped on both sides of the mating ring 2271 by the sealing structure 231 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111.

[0345] 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 mating ring portion 2271, and the axial side portions 231a on the inner and outer sides of the mating ring portion 2271 are connected by a peripheral side portion 231b located on the inner circumference of the mating ring portion 2271. In this way, the transition structure 22 can be clamped 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 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure and surrounds the mating ring portion 2271, the number of parts and assembly steps can be reduced.

[0346] In the embodiments of this application, when the pole body 21 includes a through portion 214, and a first limiting portion 215 and a second limiting portion 216 connected to the through portion 214 and clamped on both sides of the mating ring portion 2271, the configuration of the pole body 21 is not limited. It can be a single part or a combination of multiple parts (such as two or more).

[0347] For example, referring again to FIG20, at least a portion of the sealing structure 231 is sandwiched between the first limiting portion 215 and the mating ring portion 2271, and the second limiting portion 216 and the through portion 214 are assembled and connected on the side of the mating ring portion 2271 opposite to the first limiting portion 215. In this embodiment, the insulating sealing structure 23 may or may not include the second insulating member 234. The assembly and connection method of the second limiting portion 216 and the through portion 214 is not limited, such as welding, drilling, adhesive bonding, etc. Assembly and connection refers to the connection of two parts together through a connection process.

[0348] Therefore, by designing the second limiting part 216 and the through part 214 as separate components and assembling them together, the structure of the pole body 21 is simple and easy to assemble with the adapter structure 22. Furthermore, when the second limiting part 216 and the mating ring part 227 clamp the second insulating member 234, and the second limiting part 216 and the through part 214 are welded together, the thermal impact on the sealing structure 231 clamped between the first limiting part 215 and the mating ring 227 can be reduced, thereby improving the sealing reliability of the sealing structure 231.

[0349] In the above embodiments, the connection method between the through-hole portion 214 and the first limiting portion 215 is not limited; they can be an integral part or separate parts pre-connected together. For example, the end of the through-hole portion 214 facing away from the first limiting portion 215 may include a riveting portion 2141. During assembly, the through-hole portion 214 can be inserted through the mating ring portion 2271 fitted with the insulating sealing structure 23 along the direction from the first limiting portion 215 to the second limiting portion 216. Then, the riveting portion 2141 is riveted to restrict the through-hole portion 214 from disengaging along the direction from the second limiting portion 216 to the first limiting portion 215. Afterward, the riveting portion 2141 and the second limiting portion 216 can be connected, facilitating the connection between the through-hole portion 214 and the second limiting portion 216, for example, by welding. Alternatively, the riveting portion 2141 can be omitted, eliminating the riveting process after the through-hole portion 214 is inserted.

[0350] For example, please refer to Figures 21, 22, and 23. Figure 22 is an exploded view of the pole member provided in some embodiments of this application; Figure 23 is an assembly diagram of the pole member shown in Figure 22. In some other embodiments of this application, at least a portion of the sealing structure 231 is sandwiched between the first limiting portion 215 and the mating ring portion 2271, the second limiting portion 216 is integral with the through portion 214, 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 or may not include the second insulating member 234.

[0351] In the above technical solution, the assembly connection between the second limiting part 216 and the insulating sealing structure 23 is achieved by riveting. This reduces the thermal impact of the heat generated when the second limiting part 216 and the insulating sealing structure 23 are connected on the sealing structure 231 sandwiched between the first limiting part 215 and the mating ring part 2271, thereby improving the sealing reliability of the sealing structure 231. Furthermore, when the second insulating part 234 is sandwiched between the second limiting part 216 and the mating ring part 2271, the compression of the sealing structure 231 can be easily controlled by riveting the second limiting part 216, achieving a better compression effect.

[0352] In the above embodiments, the connection method between the through-hole portion 214 and the first limiting portion 215 is not limited; they can be an integral part or separate parts pre-connected together. For example, during assembly, the through-hole portion 214 can be threaded through the mating ring portion 2271 fitted 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 restrict the relative movement between the pole member 21 and the transition structure 22.

[0353] When the sealing structure 231 is an integral structure and surrounds the mating ring 2271, with the mating ring 2271 located on the side of the mating ring 2271 close to the electrode component 3 and the side away from the electrode component 3 respectively, and the pole body 21 is clamped on both sides of the mating ring 2271 in the inward and outward directions by the sealing structure 231, the pole body 21 can be in the form of the above-mentioned separate connection or in the form of the above-mentioned integral and riveted connection, which will not be elaborated here.

[0354] For example, referring to Figure 21, the electrode body 21 includes a first electrode member 21a and a second electrode member 21b. The second electrode member 21b is composed of a through portion 214, a first limiting portion 215, and a second limiting portion 216, and is installed on the first housing wall 111. The through portion 214 surrounds a mating hole 21b1 that extends through the inner and outer directions of the first housing wall 111. The first electrode member 21a is fitted onto the side of the second electrode member 21b away from the electrode component 3 and covers the mating hole 21b1. A portion of the conductive part 4 can extend into the mating hole 21b1 and connect to the first electrode member 21a. Thus, the electrode body 21 can serve to house the conductive part 4, thereby reducing the space occupied by the conductive part 4 in the receiving cavity 13 and improving the energy density of the battery cell 102.

[0355] Referring again to Figures 19 and 20, in some embodiments of this application, the first limiting portion 215 is clamped on the side of the mating ring portion 2271 near 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 axial portion 231a includes the fifth portion 2315, the mating ring portion 2271 is clamped on the outer side 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 inner side of the fifth portion 2315 (i.e., the side near the receiving cavity 13). Thus, sealing can be achieved from the side of the mating ring portion 2271 near the inside of the housing component 1, which can more effectively suppress electrolyte leakage from the mating position of the electrode body 21 and the transition structure 22, thereby improving the sealing effect.

[0356] Referring again to Figures 19 and 20, by way of example, the sealing structure 231 further includes a sixth portion 2316, which is connected to one end of the fifth portion 2315 near the pole body 21 (i.e., the inner ring portion of the fifth portion 2315), and extends relative to the fifth portion 2315 in a direction away from the electrode component 3 (i.e., closer to the outside, or in other words, in a direction away from the electrode component 3), so as to be spaced between the outer peripheral surface of the through portion 214 and the inner peripheral surface of the mating ring portion 2271.

[0357] In the above technical solution, by setting the sealing structure 231 to include a sixth part 2316 that is spaced between the outer peripheral surface of the through part 214 and the inner peripheral surface of the mating ring part 2271, insulation at this position can be achieved simply and effectively.

[0358] Please refer to Figures 22 and 23. In some embodiments of this application, the adapter structure 22 includes a fourth adapter ring 227. The fourth adapter ring 227 includes a mating ring portion 2271, and 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 connection method between the fourth adapter ring 227 and the first shell wall 111 is not limited; for example, it can be welded, riveted, drilled, glued, etc.

[0359] For example, 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.

[0360] Referring, as exemplarily to Figures 22 and 23, the fourth adapter ring 227 may include a body ring portion 2272 and a mating ring portion 2271. The body ring portion 2272 is disposed around the mating ring portion 2271. The mating ring portion 2271 protrudes relative to the body ring portion 2272 in a direction away from the electrode component 3, so as to form a third annular groove 2273 on the side of the mating ring portion 2271 near the electrode component 3. The sealing structure 231 is fitted into the third annular groove 2273. Exemplarily, when the fourth adapter ring 227 is connected to the first housing wall 111, the outer ring portion of the body ring portion 2272 may be connected to the first housing wall 111.

[0361] Therefore, since the main body 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 in other words, closer to the electrode component 3), it helps to reduce the space occupied by the electrode post body 21 inside the housing component 1. Furthermore, the bending of the fourth adapter ring 227 can form a third annular groove 2273, allowing at least a portion of the sealing structure component 231 to be recessed into the third annular groove 2273. For example, the thickness of the recessed portion can be equal to, slightly larger than, or slightly smaller than the depth of the third annular groove 2273. Thus, by providing the third annular groove 2273, the sealing structure component 231 can be positioned, facilitating improved assembly efficiency and installation reliability.

[0362] Referring again to Figures 22 and 23, by way of example, the sealing structure 231 further includes a seventh part 2317, which is connected to one end of the fifth part 2315 away from the electrode body 21 (i.e., the outer ring portion of the fifth part 2315) and extends relative to the fifth part 2315 toward the direction of the electrode component 3 (i.e., toward the inside, or toward the receiving cavity 13) to seal between the outer peripheral surface of the first limiting part 215 and the inner peripheral surface of the body ring 2272.

[0363] Therefore, by setting the sealing structure 231 to include a seventh part 2317 that also seals between the first limiting part 215 and the body ring part 2272, the sealing performance of the mating position between the pole body 21 and the adapter structure 22 can be further improved, thereby enhancing the sealing effect of the battery cell 102.

[0364] Referring again to Figures 21 and 20, in some embodiments of this application, the transition structure 22 further includes a fourth transition ring 227. The fourth transition ring 227 is a metal ring and includes a mating ring portion 2271. The fourth transition ring 227 is welded to the first shell wall 111. Therefore, the transition structure 22 has good structural strength and is suitable for connection with the metal first shell wall 111. In this embodiment, the fourth transition ring 227 may include a body ring portion 2272 that is bent and connected to the mating ring portion 2271, or it may not include the body ring portion 2272 that is bent and connected to the mating ring portion 2271.

[0365] Referring again to Figure 20, the adapter structure 22, by way of example, 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 serve as insulation between the electrode component 3 and the fourth adapter ring 227, eliminating the need for an insulating sealing structure. By way of example, the third insulating frame 228 has a pin, and the fourth adapter ring 227 has a socket; the pin is interference-fitted into the socket to achieve the connection between the third insulating frame 228 and the fourth adapter ring 227.

[0366] In some embodiments of this application, please refer again to Figures 6 and 7. The transition structure 22 is formed as an elongated strip (e.g., rectangle, ellipse, racetrack shape, etc.) extending along the length direction of the first shell wall 111. The outline shape of the electrode body 21 matches the outline shape of the transition structure 22 (e.g., rectangle, ellipse, racetrack shape, etc.). As mentioned above, the electrode component 3 is connected to the electrode component 2 via the conductive part 4. When the outline shape of the electrode body 21 is formed as an elongated strip that matches the outline shape of the transition structure 22, the area of ​​the electrode body 21 is larger, which is beneficial to increasing the connection area between the conductive part 4 and the electrode body 21, thereby improving the charging performance. "Racetrack shape" refers to an elongated oval shape, which can be generally considered to be composed of a rectangle and two semicircles. The outline shape of the elongated oval can be generally considered to be the outline shape of the rectangle after the two short sides of the rectangle are replaced by two arcs.

[0367] In other embodiments of this application, please refer again to Figures 8-10. The transition structure 22 is formed as an elongated strip (e.g., rectangular, elliptical, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111. The pole body 21 is located at the center of the length of the transition structure 22 and is circular. As a result, the connection between the transition structure 22 and the pole body 21 is subjected to uniform force, making it easier to control the compression of the insulating sealing structure 23, thereby improving the reliability of the sealing fit between the two. Moreover, the sealing area is relatively small, making it less prone to failure.

[0368] In some embodiments of this application, referring to FIG24, FIG24 is a cross-sectional view of the electrode post component provided in some embodiments of this application; the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode post body 21 is a surrounding region 2201 surrounding the electrode post body 21, that is, the circle of the inner end face 220 of the adapter structure 22 closest to the electrode post body 21 is the surrounding region 2201, and the inner end face 211 of the electrode post body 21 (that is, the side surface of the electrode post body 21 near the active material coating portion 32) protrudes out of the surrounding region 2201 in the direction close to the electrode component 3 (that is, in the direction close to the active material coating portion 32). In short, the inner end face 211 of the electrode post body 21 protrudes inwardly from the surrounding region 2201 of the inner end face 220 of the adapter structure 22.

[0369] The term "inner end face 211 of the electrode body 21" refers to the surface of the electrode body 21 closest to the electrode component 3 (i.e., closest to the active material coating portion 32). The term "inner end face 220 of the transition structure 22" refers to the surface of the transition structure 22 closest to the electrode component 3 (i.e., closest to the active material coating portion 32). The term "the inner end face 211 of the electrode body 21 protrudes from the surrounding region 2201 in the direction close to the electrode component 3" means that the inner end face 211 of the electrode body 21 protrudes from the surrounding region 2201 in the direction close to the active material coating portion 32. The inner end face 220 of the transition structure 22 can be planar or non-planar.

[0370] Therefore, by setting the inner end face 211 of the electrode body 21 to protrude from the surrounding area 2201 in the direction close to the electrode component 3, the electrode body 21 can be retracted inward in the direction of the receiving cavity 13 when the height of the electrode body 21 is constant, so as to reduce the space occupied by the electrode component 2 on the outside of the housing component 1 and reduce the size of the battery cell 102 in the direction of setting the electrode component 2 (for example, the first direction F1 shown in FIG3).

[0371] In some embodiments of this application, referring to FIG24, when the inner end face 211 of the electrode body 21 protrudes from the surrounding region 2201 in the direction close to the electrode component 3, referring to FIG6, if the adapter structure 22 is set as an elongated shape (e.g., rectangular, elliptical, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111, the outline shape of the electrode body 21 matches the outline shape of the adapter structure 22 (e.g., rectangular, elliptical, racetrack-shaped, etc.). In this way, the inner end face 211 of the electrode body 21 is relatively large, which is beneficial for laying the electrode connection portion of the conductive part 4 (e.g., the closing portion 313 of the electrode tab 33 described herein, or the second connection segment 412 or the first conductive segment 415 of the conductive component 41) flat on the inner end face 211 of the electrode body 21 (e.g., the electrode connection portion is also elongated), which is beneficial for increasing the connection area between the conductive part 4 and the electrode body 21, thereby improving the charging performance.

[0372] For example, the conductive part 4 may include a pole connection part, which may be a relatively rigid plate-shaped part that will not bend or deform downward under the action of gravity, such as the closing part 313 of the tab 33 described herein (such as an ultrasonic weld), or the second connecting section 412 (such as a metal sheet) or the first conductive section 415 (such as a metal sheet) of the conductive member 41.

[0373] In some embodiments of this application, referring to FIG25, FIG25 is a partial cross-sectional view of a battery cell provided in some embodiments of this application; when the inner end face 211 of the electrode body 21 protrudes from the surrounding area 2201 in the direction close to the electrode component 3, referring to FIG8, if the adapter structure 22 is set as an elongated strip extending along the length direction of the first shell wall 111, the electrode body 21 is located in the center of the adapter structure 22 and has a circular outline. Thus, the inner end face 211 of the electrode body 21 is relatively small. For example, in conjunction with FIG25, the conductive part 4 can be configured to include an electrode tab 33 and a conductive member 41 connected to the electrode tab 33. The conductive member 41 includes a first conductive segment 415 laid on the inner end face 211 of the electrode body 21 and a second conductive segment 416 offset from the inner end face 211 of the electrode body 21. The second conductive segment 416 protrudes relative to the first conductive segment 415 in a direction away from the electrode component 3 (i.e., close to the outside, or in other words, in a direction away from the active material coating part 32). The electrode tab 33 is connected to the second conductive segment 416.

[0374] Therefore, the height difference between the electrode body 21 and the transition structure 22 can be used to accommodate the second conductive segment 416 of the conductive element 41 and the tab 33, thereby making full use of space, reducing the space occupied by the conductive part 4 in the receiving cavity 13, and improving the energy density of the battery cell 102. For example, if the part where the tab 33 connects to the second conductive segment 416 (such as the folding part 313 described herein) is elongated, the second conductive segment 416 can also be set to be elongated, while the first conductive segment 415 can be set to be circular to match the electrode body 21, which can meet the connection requirements.

[0375] When the conductive part 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 the direction away from the electrode component 3, a material with a certain hardness and thickness can be selected to process the conductive part 4. For example, the conductive part 4 can be a metal sheet.

[0376] In some embodiments of this application, in conjunction with FIG26, FIG26 is a cross-sectional view of the pole piece provided in some embodiments of this application; the position of the inner end face 220 of the adapter structure 22 adjacent to the pole piece body 21 is a surrounding area 2201 surrounding the pole piece body 21, that is, the circle of the inner end face 220 of the adapter structure 22 closest to the pole piece body 21 is the surrounding area 2201, and the surrounding area 2201 is flush with the inner end face 211 of the pole piece body 21 (that is, the side surface of the pole piece body 21 near the active material coating part 32). At this time, when the inner end face 211 of the pole body 21 is small (for example, when the transition structure 22 is set as a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is located in the center of the transition structure 22 and has a circular outline), a part of the pole connection part of the conductive part 4 (for example, the folding part 313 of the pole tab 33 described herein, or the second connection section 412 or the first conductive section 415 of the conductive member 41) can be laid flat on the inner end face 211 of the pole body 21, and the rest can be laid flat on the surrounding area 2201 (for example, when the pole connection part is also long strip), so that the pole connection part of the conductive part 4 can be supported as a whole, which is convenient for the welding nozzle to be pressed, so that the conductive part 4 can be reliably connected to the pole body 21.

[0377] For example, the conductive part 4 may include a pole connection part, which may be a relatively rigid plate-shaped part that will not bend or deform downward under the action of gravity, such as the closing part 313 of the tab 33 described herein (such as an ultrasonic weld), or the second connecting section 412 (such as a metal sheet) or the first conductive section 415 (such as a metal sheet) of the conductive member 41.

[0378] In addition, when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, the inner end face 211 of the pole body 21 can also be set to be larger (for example, the transition structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 111, and the outline shape of the pole body 21 matches the outline shape of the transition structure 22).

[0379] For example, referring to FIG26, when the surrounding region 2201 is flush with the inner end face 211 of the electrode body 21, the inner end face 220 of the transition structure 22 can be formed as a plane, thereby facilitating the processing of the transition structure 22. Alternatively, for example, referring to FIG27 and FIG28, FIG27 is a structural schematic diagram of a battery cell provided in some embodiments of this application, and FIG28 is a cross-sectional view along line BB in FIG27; when the inner end face 220 of the transition structure 22 includes the surrounding region 2201, and the surrounding region 2201 is flush with the inner end face 211 of the electrode body 21, the transition structure 22 can be configured such that the portion surrounding the electrode body 21 protrudes in a direction away from the electrode component 3, so that the inner end face 220 of the transition structure 22 defines a first groove 511 that opens in a direction close to the electrode component 3. Thus, at least a portion of the conductive part 4 can be accommodated using the first groove 511, thereby reducing the space occupied by the conductive part 4 in the receiving cavity 13 and increasing the energy density of the battery cell 102.

[0380] In some embodiments of this application, referring again to FIG5, the electrode post 2 forms a receiving groove 5 that is recessed relative to the first shell wall 111 in a direction away from the electrode post 3 and open in a direction towards the electrode post 3. The electrode post 3 is connected to the electrode post 2 via a conductive part 4, at least a portion of which is accommodated in the receiving groove 5 and connected to the electrode post body 21. That is, the electrode post 2 forms the receiving groove 5, the groove wall of the receiving groove 5 is formed by the electrode post 2, the receiving groove 5 is recessed in a direction away from the active material coating part 32, and the receiving groove 5 is open in a direction towards the active material coating part 32, so that the receiving groove 5 communicates with the receiving cavity 13.

[0381] Therefore, by providing a receiving groove 5 to accommodate the conductive part 4, the space occupied by the conductive part 4 in the receiving cavity 13 can be reduced, allowing the receiving cavity 13 to have a larger space to accommodate the active material coating part 32. This is beneficial for increasing the volume of the active material coating part 32, thereby increasing the energy density of the battery cell 102. Moreover, since the receiving groove 5 is open towards the electrode component 13, the conductive part 4 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0382] For example, referring again to FIG5, the receiving groove 5 is formed on the side of the electrode component 3 (i.e. the side facing the active material coating portion 32) of the electrode body 21 and the transition structure 22. The transition structure 22 protrudes relative to the first shell wall 111 in the direction away from the electrode component 3 (i.e. the direction away from the active material coating portion 32), so that the receiving groove 5 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3.

[0383] Therefore, by processing the adapter structure 22 into an outwardly protruding shape, a portion of the receiving groove 5 is formed on the side of the pole body 21 facing the electrode component 3, and another portion of the receiving groove 5 is formed on the side of the adapter structure 22 facing the electrode component 3. The receiving groove 5 has a shape that is concave relative to the first shell wall 111 in the direction away from the electrode component 3. Thus, both the side of the pole body 21 facing the electrode component 3 and the side of the adapter structure 22 facing the electrode component 3 have a space receiving groove conductive part 4. This not only facilitates the storage of the conductive part 4 to a greater extent, but also facilitates the design of diverse forms of the conductive part 4.

[0384] In other embodiments of this application, referring to FIG14, when the adapter structure 22 does not bulge 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), the receiving groove 5 can be defined by the height difference between the adapter structure 22 and the electrode body 21 in the direction away from the electrode component 3 relative to the first shell wall 111.

[0385] In some embodiments of this application, referring again to FIG5, the surface of the end of the electrode body 21 facing the electrode component 3 is the inner end face 211 of the electrode body 21. The inner end face 211 of the electrode body 21 forms the receiving groove 5, and the conductive part 4 is connected to the inner end face 211 of the electrode body 21. That is, at least a portion of the inner end face 211 of the electrode body 21 defines the groove wall of the receiving groove 5, and the conductive part 4 is connected to the portion of the inner end face 211 of the electrode body 21 that serves as the groove wall of the receiving groove 5. In the above technical solution, at least a portion of the receiving groove 5 is formed by the side surface of the electrode body 21 facing the electrode component 3, and the conductive part 4 housed in the receiving groove 5 can easily contact and connect to the electrode body 21, improving connection convenience and simplifying the structure.

[0386] For example, when at least a portion of the conductive part 4 is accommodated in the receiving groove 5, the pole connecting portion of the conductive part 4 (e.g., the tab 33 or conductive member 41) (e.g., the folding portion 313 of the tab 33 described herein, or the second connecting segment 412 or the first conductive segment 415 of the conductive member 41) can be laid on the inner end face 211 of the pole body 21 and connected to the inner end face 211 of the pole body 21. During processing, the pole connecting portion of the conductive part 4 can be first inserted into the receiving groove 5, and then the pole connecting portion can be laid on the inner end face 211 of the pole body 21 and connected to the inner end face 211 of the pole body 21.

[0387] The configuration of the receiving tank 5 is not limited and can be flexibly designed and constructed.

[0388] Referring again to Figures 8-10, exemplarily, the adapter structure 22 is constructed as a raised shape relative to the first shell wall 111 in the direction away from the electrode component 3, so that the adapter structure 22 surrounds a first recess 511 in the direction away from the electrode component 3, and the receiving groove 5 includes the first recess 511. Thus, by processing the adapter structure 22 into an outwardly protruding raised form, the first recess 511 can be surrounded by the adapter structure 22, and the first recess 511 is easy to process. 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 described above, or the third adapter ring 223 described above, or the fourth adapter ring 227 described above, etc.

[0389] It is worth noting that, since the adapter structure 22 needs to surround the electrode body 21, the adapter structure 22 has a central annular hole. The portion of the first groove 511 opposite to the central annular hole can be partially occupied by the electrode body 21 (for example, the inner end face 211 of the electrode body 21 protrudes from the surrounding area 2201 in the direction of the electrode component 3), or it can be left unoccupied by the electrode body 21 (for example, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is the surrounding area 2201 surrounding the electrode body 21; referring to Figure 29, the surrounding area 2201 is flush with the inner end face 211 of the electrode body 21, or, referring to Figure 29, the surrounding area 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction of the electrode component 3).

[0390] For example, the transition structure 22 (e.g., the first transition ring 221, the third transition ring 223, or the fourth transition ring 227) can be constructed by a stamping process into a shape that protrudes relative to the first shell wall 111 in a direction away from the electrode component 3.

[0391] Referring again to Figure 14, by way of example, 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 form a second groove 512 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. The receiving groove 5 includes the second groove 512.

[0392] That is, the inner end face 211 of the electrode body 21 is positioned further away from the electrode component 3 relative to the surrounding portion 22a1, so that the receiving groove 5 includes a second groove 512 formed between the electrode body 21 and the surrounding portion 22a1 of the transition structure 22. Thus, by providing a height difference between the electrode body 21 and the surrounding portion 22a1, the second groove 512 can be naturally formed by the relative position of the electrode body 21 and the transition structure 22, making it easy to obtain. In this embodiment, the configuration of the transition structure 22 is not limited; for example, it can be a combination of the first transition ring 221 and the second transition ring 222 described above, or the third transition ring 223 described above, etc.

[0393] In some embodiments of this application, referring to FIG29, the transition structure 22 protrudes relative to the first shell wall 111 in the direction away from the electrode component 3 to form a first groove 511. Simultaneously, the transition structure 22 includes a surrounding portion 22a1 located on the side of the electrode body 21 near the electrode component 3. The surrounding portion 22a1 and the electrode body 21 form a second groove 512 recessed in the direction away from the electrode component 3. The second groove 512 communicates with the side of the first groove 511 away from the electrode component 3. The receiving groove 5 includes the first groove 511 and the second groove 512. The conductive part 4 is connected to the electrode body 21 through the first groove 511 and the second groove 512. Therefore, the volume of the receiving groove 5 can be increased, further reducing the space occupied by the conductive part 4 in the receiving cavity 13.

[0394] Referring to Figure 21, in some embodiments of this application, the electrode component 2 includes an electrode body 21, and a conductive part 4 is connected to the electrode body 21. The electrode body 21 includes a first electrode member 21a and a second electrode member 21b. The second electrode member 21b is connected to the adapter structure 22 and defines a mating hole 21b1. The first electrode member 21a is mounted on the second electrode member 21b and is located on the side of the second electrode member 21b opposite to the electrode component 3 and covers the mating hole 21b1. The receiving groove 5 includes a third groove 513 formed by the first electrode member 21a and the second electrode member 21b. Thus, the electrode body 21 is configured to be assembled from two parts, defining the third groove 513 by itself, thereby facilitating the acquisition of the third groove 513. In this embodiment, the configuration of the transition structure 22 is not limited. For example, it can be a combination of the first transition ring 221 and the second transition ring 222, or the third transition ring 223, or the fourth transition ring 227, etc.

[0395] In some embodiments of this application, the adapter structure 22 protrudes relative to the first shell wall 111 towards the direction away from the electrode component 3 to form a first groove 511. Simultaneously, the electrode body 21, through the first electrode component 21a and the second electrode component 21b, forms a third groove 513 recessed towards the direction away from the electrode component 3. The third groove 513 connects to the side of the first groove 511 away from the electrode component 3. The receiving groove 5 includes the first groove 511 and the third groove 513. The conductive part 4 is connected to the first electrode component 21a through the first groove 511 and the third groove 513. This increases the volume of the receiving groove 5 and further reduces the space occupied by the conductive part 4 in the receiving cavity 13.

[0396] Referring to Figure 29, which is a cross-sectional view of the electrode post component provided in some embodiments of this application; in some embodiments of this 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 protruding from the connection end 22a in a direction away from the electrode post component 3 (i.e., away from the active material coating portion 32), and the electrode post body 21 is mounted on the raised portion 22b. Therefore, by setting the raised portion 22b to mount the electrode post body 21, the space occupied by the electrode post body 21 in the receiving cavity 13 can be reduced, thereby improving the energy density of the battery cell 102.

[0397] For example, referring to FIG29, a receiving groove 5 is formed on the side of the raised portion 22b and the transition structure 22 near the electrode component 3. The electrode component 3 is connected to the terminal 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 terminal body 21. Thus, by providing the raised portion 22b and forming the receiving groove 5 on the side of the raised portion 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, so that the receiving cavity 13 has a larger space to accommodate the active material coating portion 32, which is beneficial to increase the volume of the active material coating portion 32, thereby increasing the energy density of the battery cell 102.

[0398] For example, referring to FIG29, a first groove 511 is formed on the side of the raised portion 22b near 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 transition structure 22 protrudes 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 first groove 511 is formed on the inner side of the raised portion 22b (i.e., the side near the active material coating portion 32). Thus, by providing the first groove 511 to accommodate the conductive portion 4, the space occupied by the conductive portion 4 in the receiving cavity 13 can be reduced, so that the receiving cavity 13 has a larger space to accommodate the active material coating portion 32, which is beneficial to increase the volume of the active material coating portion 32, thereby increasing the energy density of the battery cell 102.

[0399] In some embodiments of this application, referring to FIG24, the adapter structure 22 includes a connecting end 22a connected to the first shell wall 111, and the adapter structure 22 includes an indented portion 22c recessed relative to the connecting end 22a toward the direction near the electrode post component 3 (i.e., toward the direction near the active material coating portion 32), and the electrode post body 21 is mounted in the indented portion 22c. Thus, when the height of the electrode post body 21 is constant, it is equivalent to the electrode post body 21 being recessed inward toward the direction of the receiving cavity 13 (i.e., toward the direction near the active material coating portion 32), which helps to reduce the space occupied by the electrode post body 21 on the outside of the shell component 1 and reduce the size of the battery cell 102 in the direction of setting the electrode post component 2 (e.g., the first direction F1 shown in FIG3).

[0400] For example, referring to FIG24, the surface of the recessed portion 22c near the electrode component 3 is a surrounding region 2201 that surrounds the electrode body 21. The inner end face 211 of the electrode body 21 protrudes from the surrounding region 2201 in the direction near the electrode component 3, or the surrounding region 2201 is flush with the inner end face 211 of the electrode body 21. Thus, flexible processing can be achieved to meet various needs.

[0401] For example, referring to the above, by setting the inner end face 211 of the electrode body 21 to protrude from the surrounding area 2201 in the direction close to the electrode component 3, the electrode body 21 can be retracted inward in the direction of the receiving cavity 13 when the height of the electrode body 21 is constant, so as to reduce the space occupied by the electrode component 2 on the outside of the housing component 1 and reduce the size of the battery cell 102 in the direction of setting the electrode component 2 (e.g., the first direction F1 shown in FIG3).

[0402] For example, referring to the above, when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, if the inner end face 211 of the pole body 21 is small (for example, when the transition structure 22 is set as a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is located in the center of the transition structure 22 and has a circular outline), a part of the pole connection part of the conductive part 4 (for example, the gathering part 313 of the pole ear part 33 described herein, or the second connection section 412 or the first conductive section 415 of the conductive member 41) can be laid flat on the inner end face 211 of the pole body 21, and the rest can be laid flat on the surrounding area 2201 (for example, when the pole connection part is also long strip), so that the pole connection part of the conductive part 4 can be supported as a whole, which is convenient for the welding nozzle to be pressed, so that the conductive part 4 can be reliably connected to the pole body 21.

[0403] Referring to Figures 30-33, Figure 30 is a partial cross-sectional view of a battery cell provided in some embodiments of this application, in which the terminal component is in a state before being covered by the first shell wall; Figure 31 is a state diagram of the terminal component shown in Figure 30 after being covered by the first shell wall; Figure 32 is a partial cross-sectional view of a battery cell provided in some embodiments of this application, in which the terminal component is in a state before being covered by the first shell wall; Figure 33 is a state diagram of the terminal component shown in Figure 32 after being covered by the first shell wall.

[0404] In some embodiments of this application, the adapter structure 22 includes a connecting end 22a connected to the first shell wall 111. One of the connecting 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 circumferentially along the mounting hole 112 and opens towards the direction away from the electrode component 3 (i.e., close to the outer side of the first shell wall 111). The location of the fourth annular groove C1 can be chosen flexibly depending on whether the electrode component 2 is installed on the first shell wall 111 from the outside or the inside.

[0405] Therefore, the fourth annular groove C1 serves as an assembly positioning feature, facilitating the assembly and connection of the pole post component 2 and the first housing wall 111. Furthermore, since the fourth annular groove C1 is open near the outer side, the transition structure 22 and the first housing wall 111 can be welded from the outside of the first housing wall 111, which improves the ease and reliability of the connection between the pole post component 2 and the first housing wall 111.

[0406] For example, referring to Figures 30 and 31, during the processing of the battery cell 102, the electrode component 3 and the terminal component 2 can be connected first, and then the terminal component 2 can be connected to the housing component 1. For example, the terminal 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 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 part 4 can be extended from the mounting hole 112 to the outside of the first housing wall 111 and connected to the terminal component 2 that is pre-set on the outer side of the first housing wall 111. In summary, when the electrode post 2 is connected to the electrode component 3 and the electrode post 2 is located outside the first shell wall 111, the electrode post 2 can be placed over the mounting hole 112 of the first shell wall 111 from the outside (i.e., the side away from the active material coating portion 32). At this time, the edge of the electrode post 2 can be supported on the side of the first shell wall 111 away from the electrode component 3. Therefore, since the electrode post 2 is placed over the first shell wall 111 from the outside, it facilitates the assembly and connection of the electrode post 2 and the first shell wall 111, which helps to improve the reliability of the connection between the electrode post 2 and the first shell wall 111.

[0407] Referring again to Figures 30 and 31, exemplarily, the first shell wall 111 has a fourth annular groove C1 surrounding the mounting hole 112. The fourth annular groove C1 opens in the direction away from the electrode component 3 (that is, the fourth annular groove C1 opens in the direction away from the active material coating portion 32). The edge of the electrode post component 2 has a flange portion 241 surrounding the electrode post component 2, and the flange portion 241 is embedded in the fourth annular groove C1. This facilitates the support and positioning of the connection between the electrode post component 2 and the first shell wall 111, and is beneficial for welding the two together from the outside of the first shell wall 111 (that is, the side away from the active material coating portion 32).

[0408] Referring again to Figures 30 and 31, exemplarily, the thickness of the flange 241 matches the groove depth T1 of the fourth annular groove C1. Here, "matching" means that the thickness of the flange 241 is substantially the same as the groove depth of the fourth annular groove C1. This facilitates welding the flange 241 to the first shell wall 111. The thickness of the flange 241 is not too large relative to the groove depth of the fourth annular groove C1, reducing unnecessary space occupation; nor is the thickness of the flange 241 too small relative to the groove depth of the fourth annular groove C1, meeting the welding strength requirements.

[0409] For example, referring to Figure 6, and in conjunction with Figures 30 and 31, the ratio of the width W2 of the electrode post 2 to its length L2 satisfies 10% to 60%, a range applicable to both the positive and negative electrode post 2. Further, the ratio of the width W2 to the length L2 of the electrode post 2 can also satisfy 25% to 40%, for example, if the width W2 of the electrode post 2 is approximately 21 mm and the length L2 is approximately 63 mm, the ratio of the width W2 to the length L2 of the electrode post 2 is approximately 33%.

[0410] Therefore, by setting the ratio of the width W2 of the electrode component 2 to the length L2 of the electrode component 2 to be 10% to 60%, the overall area of ​​the electrode component 2 can be relatively large, which is beneficial to ensure that the electrical connection area between the electrode component 2 and the electrode component 3 can meet the relatively large requirements. At the same time, the width of the electrode component 2 is relatively small compared to its length. Thus, when connecting the electrode component 2 and the electrode component 3, the electrode component 2 can be placed with one edge of its width facing the active material coating part 32. Since the width of the electrode component 2 is small, it is beneficial to shorten the distance between the electrode component 2 and the active material coating part 32, thereby shortening the length of the conductive part 4 and reducing the redundancy of the conductive part 4.

[0411] For example, referring to Figure 6, the terminal component 2 can be configured such that the ratio of the width W2 of the terminal component 2 to the width W1 of the first shell wall 111 is 20% to 90%, a range applicable to both the positive and negative terminal components 2. Further, the ratio of the width W2 of the terminal component 2 to the width W1 of the first shell wall 111 is 70% to 80%, for example, the width W2 of the terminal component 2 is approximately 21 mm, and the width W1 of the first shell wall 111 is approximately 28 mm, resulting in a ratio of approximately 75%. This facilitates full utilization of the space in the width direction of the first shell wall 111 by the terminal component 2. For example, the width W1 of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the width direction of the first shell wall 111, for example, as shown in Figure 3, the width of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the second direction F2.

[0412] For example, referring to Figure 6, when two pole pieces 2 are provided on the first shell wall 111 at intervals along its length, the ratio of the length L2 of the pole piece 2 to the length L1 of the first shell wall 111 is 25% ± 15% (i.e., 10% to 40%). This range applies to both the positive and negative pole pieces 2. Further, the ratio of the length L2 of the pole piece 2 to the length L1 of the first shell wall 111 is 15% to 30%. For example, if the length L2 of the pole piece 2 is approximately 63 mm and the length L1 of the first shell wall 111 is approximately 297 mm, the ratio is approximately 21%. This allows the pole piece 2 to fully utilize the space along the length of the first shell wall 111. For example, the length L1 of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the length direction of the first shell wall 111. For example, as shown in FIG3, the length of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the third direction F3.

[0413] For example, referring to FIG34, the shape of the mounting hole 112 matches the outline shape of the pole member 2. For example, when the pole member 2 includes the adapter structure 22, the outline shape of the adapter structure 22 (i.e. the outer ring shape of the adapter structure 22) matches the shape of the mounting hole 112, which facilitates the connection between the pole member 2 and the first shell wall 111, and facilitates the pole member 2 to expose more area in the direction of the receiving cavity 13, which is conducive to accommodating the conductive part 4 and / or connecting to the conductive part 4.

[0414] For example, the shape of the mounting hole 112 matches the outline shape of the pole member 2, and is orthographically projected onto a projection plane perpendicular to the thickness direction of the first shell wall 111. The orthographic projection of the mounting hole 112 on the projection plane falls completely within the orthographic projection range of the pole member 2 on the projection plane, thereby making the first shell wall 111 and the pole member 2 have a certain overlapping area, which is beneficial to the simple and reliable connection between the two.

[0415] In some embodiments of this application, referring to FIG34, which is an exploded view of the first shell wall and the electrode post component provided in some embodiments of this application; the mounting hole 112 is an elongated hole, and the electrode post component 2 is formed into an elongated structure that matches the shape of the mounting hole 112. The specific shape of the elongated shape is not limited, for example, it can be rectangular, elliptical, racetrack-shaped, etc. This is beneficial to increasing the area of ​​the electrode post component 2, thereby increasing the connection area between the electrode post component 2 and the electrode component 3, and thus improving the current carrying capacity. Furthermore, referring to Figures 30 and 31, when the terminal component 2 needs to extend from the mounting hole 112 to the outside of the first shell wall 111, and then the terminal component 2 is flipped from the outside of the first shell wall 111 to cover the mounting hole 112, and then the terminal component 2 is connected to the first shell wall 111, if the terminal component 2 is set as an elongated structure that matches the shape of the mounting hole 112, the terminal component 2 can be adjusted to pass through the mounting hole 112 at an angle close to the width direction of the mounting hole 112. After passing through the mounting hole 112, the thickness direction of the terminal 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 terminal component 2 is smaller, which can reduce the space required for the flipping of the terminal component 2, thereby helping to shorten the length of the conductive part 4, save materials, reduce costs, and reduce the redundancy of the conductive part 4, reduce the space occupied by the conductive part 4 in the receiving cavity 13, and help to improve the energy density of the battery cell 102.

[0416] For example, referring to Figures 32 and 33, during the processing of the battery cell 102, the electrode component 3 and the terminal component 2 can be connected first, and then the terminal component 2 can be assembled and connected to the housing component 1. For example, after the electrode component 3 and the terminal component 2 are connected, the electrode component 3 and the terminal component 2 can be placed together on the inner side of the first housing wall 111. In this way, the terminal component 2 can be covered by the mounting hole 112 of the first housing wall 111 from the inner side (i.e., the side near the active material coating portion 32). At this time, the edge of the terminal component 2 is supported by the side of the first housing wall 111 near the electrode component 3. Thus, since the terminal component 2 is covered by the first housing wall 111 from the inner side, the electrode component 3 and the terminal component 2 can be placed together on the inner side of the first housing wall 111. The terminal 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.

[0417] Referring again to Figures 32 and 33, exemplarily, the edge of the electrode post 2 has a fourth annular groove C1 that opens towards the direction away from the electrode post 3 (i.e., the fourth annular groove C1 opens towards the direction away from the active material coating portion 32). The first shell wall 111 includes an overlapping portion 1112 surrounding the mounting hole 112, and the overlapping portion 1112 is embedded in the fourth annular groove C1. This facilitates the support and positioning of the connection between the electrode post 2 and the first shell wall 111, and allows for welding the two together from the outside of the first shell wall 111 (i.e., the side away from the active material coating portion 32).

[0418] Referring again to Figures 32 and 33, exemplarily, the thickness of the overlapping portion 1112 matches the groove depth T2 of the fourth annular groove C1. Here, "matching" means that the thickness of the overlapping portion 1112 is substantially the same as the groove depth of the fourth annular groove C1. This facilitates welding the overlapping portion 1112 to the first shell wall 111. The thickness of the overlapping portion 1112 relative to the groove depth of the fourth annular groove C1 is not too large, reducing unnecessary space occupation; nor is the thickness of the overlapping portion 1112 relative to the groove depth of the fourth annular groove C1 too small, thus meeting welding strength requirements.

[0419] Please refer again to Figure 7. In some embodiments of this application, the tab 33 extends to and connects to the electrode body 21, for example, by welding, bonding with conductive adhesive, or connecting by drilling. In this case, the conductive part 4 may only include the tab 33, eliminating the need for the conductive element 41 extending from the tab 33 to the electrode body 21, thus saving material costs for the conductive element 41 and the connection steps between the conductive element 41 and the tab 33.

[0420] In some embodiments of this application, referring to FIG7, the tab portion 33 includes a gathering portion 313 formed by stacking and connecting multiple tab pieces 311.

[0421] For example, the tab portion 33 of the electrode component 3 includes a stacked portion 312 formed by stacking and gathering multiple layers of tabs 311, and the multiple layers of tabs 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 electrode assembly having a positive electrode tab 311 and a negative electrode tab 311. Stacking and gathering multiple layers of tabs 311 of the same polarity to form the stacked portion 312 facilitates pre-processing of the tab portion 33 or connection operations with other components.

[0422] For example, the multiple layers of tabs 311 in the stacked portion 312 may belong to the same electrode assembly 31 or to different electrode assemblies 31. That is, several layers of tabs 311 of the same polarity in the same electrode assembly 31 can be gathered to form the stacked portion 312, or several layers of tabs 311 of the same polarity in different electrode assemblies 31 can be gathered to form the stacked portion 312. For example, all the tabs 311 of the same polarity in the electrode component 3 can be gathered to form the stacked portion 312, which can reduce the number of stacked portions 312.

[0423] In the above technical solution, by connecting the multi-layered tabs 311 in the stacked portion 312 to form a gathered portion 313, 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 not only have a stacked arrangement, but also have a connected and conductive relationship. The connection method of the multi-layered tabs 311 in the gathered portion 313 is not limited, and can be welding (such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure welding, or brazing, etc.), through-hole connection, or bonding with conductive adhesive, etc. For example, multi-layered tabs 311 of the same polarity can be ultrasonically welded, and the resulting ultrasonic weld mark is the gathered portion 313.

[0424] For example, the multiple layers of tabs 311 in the gathering portion 313 may belong to the same electrode assembly 31 or to different electrode assemblies 31. That is, several layers of tabs 311 of the same polarity in the same electrode assembly 31 can be connected to form the gathering portion 313, or several layers of tabs 311 of the same polarity in different electrode assemblies 31 can be connected to form the gathering portion 313. For example, all the tabs 311 of the same polarity in the electrode component 3 can be connected to form the gathering portion 313, which can reduce the number of gathering portions 313.

[0425] In the above technical solution, by pre-connecting multiple layers of tabs 311 in the tab portion 33 to form a gathering portion 313, the gathering portion 313 can present a plate shape with multiple layers of tabs 311 connected together and having a certain rigidity, rather than a loose and scattered multi-layer foil shape. This facilitates the assembly and connection operations of the tab portion 33 with other components, such as perforation and welding operations. This makes it less likely for pores to form in the weld seam formed by the tab portion 33 and other components, which can improve the connection reliability and conductivity of the weld, and make the conductivity between the electrode component 3 and the pole component 2 more stable and reliable.

[0426] For example, during processing, multiple electrode assemblies 31 can be stacked first, and multiple layers of tabs 311 of the same polarity of the multiple electrode assemblies 31 can be ultrasonically welded to form a condensation portion 313. This improves the problem of tensile stress between the tabs 311 caused by the asynchrony of the electrode assemblies 31, which leads to cracking of the condensation portion 313 in the form of ultrasonic weld.

[0427] Please refer again to Figure 7. In some embodiments of this application, the tab portion 33 includes a gathering portion 313 formed by stacking and connecting multiple layers of tab pieces 311. At least a portion of the gathering portion 313 is laid on the inner end face 211 of the pole body 21 and connected to the inner end face 211 of the pole body 21 (e.g., by welding, bonding, drilling, etc.). Here, "laid" means that at least a portion of one side surface of the gathering portion 313 in the thickness direction is in face-to-face contact with the inner end face 211 of the pole body 21.

[0428] Therefore, by pre-connecting (e.g., ultrasonically welding) the multiple layers of tabs 311 in the tab portion 33 to form a gathered portion 313, the gathered portion 313 can present a plate-like shape with a certain rigidity, where the multiple layers of tabs 311 are connected together, rather than a loose, scattered multi-layered foil shape. This facilitates the mating connection between the tab portion 33 and the electrode post body 21, making the welding between the tab portion 33 and the electrode post body 21 more reliable. It also reduces the likelihood of voids forming in the weld, improving the connection reliability and conductivity at the weld joint, and making the conductivity between the electrode component 3 and the electrode post component 2 more stable and reliable. Furthermore, by laying at least a portion of the gathered portion 313 on the inner end face 211 of the electrode post body 21, the connection area between the tab portion 33 and the electrode post body 21 can be increased, improving connection reliability and current carrying capacity.

[0429] Please refer again to Figure 7. In some embodiments of this application, the retractable portion 313 is completely laid on the inner end face 211 of the electrode body 21. That is, the area of ​​the inner end face 211 of the electrode body 21 is greater than or equal to that of the retractable portion 313, so that the retractable portion 313 can completely fall on the inner end face 211 of the electrode body 21. Thus, the retractable portion 313 can be in a completely flat and laid-out state, and the projection of the retractable portion 313 falls completely on the inner end face 211 of the electrode body 21. This prevents damage to the tab portion 33 due to bending of the retractable portion 313, improves the charging performance of the tab portion 33, and also helps to increase the connection area between the inner end face 211 of the electrode body 21 and the retractable portion 313, improves the current carrying efficiency, and facilitates the clamping of the welding nozzle to tighten the retractable portion 313, thereby improving the connection reliability between the retractable portion 313 and the electrode body 21.

[0430] For example, referring to FIG28, when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, and the inner end face 211 of the pole body 21 is smaller than the area of ​​the gathering part 313, a part of the gathering part 313 can be laid on the inner end face 211 of the pole body 21, and the rest can be laid on the surrounding area 2201. At this time, the gathering part 313 can also be in a completely flat and unfolded state.

[0431] In some embodiments of this application, please refer again to FIG5, the tab 33 is connected to the electrode body 21 via a conductive element 41. Therefore, by indirectly connecting the tab 33 and the electrode body 21 via the conductive element 41, the length of the tab 33 can be shortened, improving issues such as wrinkling, bending, and breakage of the tab 311. Furthermore, by flexibly designing the shape and material of the conductive element 41, the connection difficulty with the electrode body 21 can be reduced, improving the ease of connection between the conductive element 41 and the electrode body 21.

[0432] For example, the laminated portion 312 can be connected to the conductive element 41, thereby eliminating the step of connecting the laminated portion 312 to form the closing portion 313. Alternatively, for example, the multilayer tabs 311 in the laminated portion 312 can be connected to form the closing portion 313 before connecting the closing portion 313 to the conductive element 41, thereby allowing for flexible and diverse design of the structural form of the conductive element 41.

[0433] For example, referring again to Figure 5, the conductive element 41 can be connected to the inner end face 211 of the electrode body 21, thereby shortening the length of the conductive element 41. For instance, the conductive element 41 may include a second connecting segment 412, which can be laid on and connected to the inner end face 211 of the electrode body 21, thereby improving the connection reliability and charging performance between the conductive element 41 and the electrode body 21. Alternatively, for example, the conductive element 41 can also be connected to other locations on the electrode body 21, such as pre-embedding the conductive element 41 in the electrode body 21 or passing through the electrode body 21 for connection.

[0434] In some embodiments of this application, referring to Figures 35A-35D, the conductive element 41 includes a first connecting segment 411, which includes two clamping portions 4110. The electrode tab portion 33 includes an electrode tab end 331, which is clamped between the two clamping portions 4110 and connected to the clamping portions 4110 (e.g., by welding, drilling, or bonding with conductive adhesive). The electrode tab end 331 can be a stacked portion 312 or a gathered portion 313. Thus, the two clamping portions 4110 can be used to limit the electrode tab end 331, improving the connection reliability of the multiple electrode tabs 311 in the electrode tab end 331. In addition, in some examples, by setting two clamping parts 4110, the tab end 331 clamped between the two clamping parts 4110 can be in the state of a stacked part 312, which can eliminate the step of connecting the multiple layers of tabs 311 in the stacked part 312 to form a gathering part 313, thereby simplifying the processing procedure and improving processing efficiency.

[0435] Please refer again to Figures 35A-35D. Exemplarily, the conductive element 41 includes a second connecting segment 412, which is laid on and connected to the inner end face 211 of the electrode body 21. The conductive element 41 is bent at the connection point 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 away from the electrode body 21 (or closer to the active material coating portion 32). A clamping portion 4110 supports the tab end 331 on the side away from the electrode body 21 (or closer to the active material coating portion 32). Thus, by supporting the tab portion 33 with the clamping portion 4110, the redundancy of the tab portion 33 can be improved, reducing the risk of a short circuit caused by the tab portion 33 being inserted backwards into the active material coating portion 32. Moreover, the bent conductive part 41 can act as a buffer and support, reducing the risk of the electrode part 3 hitting the first shell wall 111 and improving the reliability of the battery cell 102.

[0436] In addition, to facilitate bending, the conductive element 41 can be made in a way that reduces the material at the connection position between the first connecting segment 411 and the second connecting segment 412, for example, by reducing the width or the thickness. 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 electrode tab 33, and the connection between the second connecting segment 412 and the electrode body 21. At the same time, it also facilitates the bending of the conductive element 41 at the connection position between the first connecting segment 411 and the second connecting segment 412.

[0437] 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 layers of tab sheets 311. The conductive element 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, and its thickness direction is consistent with that of the gathered portion 313. The two are stacked along the thickness direction of the first connecting segment 411, thus simplifying the connection between the gathered portion 313 and the conductive element 41 and improving production efficiency.

[0438] Referring again to Figures 36A-36C, exemplarily, the first connecting segment 411 supports the side of the retractable portion 313 facing away from the electrode body 21, so that the retractable portion 313 is clamped between the inner end face 211 of the electrode body 21 and the first connecting segment 411. Thus, by supporting the retractable portion 313 with the first connecting segment 411, the redundancy of the tab portion 33 can be improved, reducing the risk of short circuit caused by the tab portion 33 being inserted backwards into the active material coating portion 32.

[0439] In some embodiments of this application, referring again to FIG5, the conductive portion 4 is bent to form at least two opening slots 42, wherein the openings of the two opening slots 42 have different orientations and are adjacent in the direction from the electrode body 21 to the active material coating portion 32 (for example, as shown in FIG5, one of the two adjacent opening slots 42 faces left and the other faces right). Thus, the conductive portion 4 can present a serpentine shape with reciprocating bending. The conductive portion 4 can act as a buffer, reducing the impact of the active material coating portion 32 toward the first shell wall 111 when the battery cell 102 is used in a vibration environment, thereby protecting the electrode component 3 and improving the reliability of the battery cell 102. Moreover, since the conductive portion 4 does not extend irregularly, it can improve the mutual interference and scratching between the tabs 311 in the conductive portion 4, as well as the risk of the tabs 311 being inserted backwards into the active material coating portion 32, thereby further improving the reliability of the battery cell 102.

[0440] For example, referring again to FIG5, when the conductive part 4 includes a tab 33 and a conductive member 41 connected to the tab 33, and the tab 33 is connected to the pole body 21 via the conductive member 41, the conductive member 41 and the tab 33 are bent together to form two adjacent opening slots 42 with opposite opening orientations. For example, one opening slot 42 is defined between the first connecting segment 411 and the second connecting segment 412, and the first connecting segment 411 and the tab 33 define another opening slot 42. Thus, the conductive part 4 can present a reciprocating S-shape, thereby shortening the length of the conductive part 4, simplifying the structure of the conductive part 4, and facilitating the processing of the conductive part 4. Alternatively, for example, referring to FIG21, when the conductive part 4 is connected to the pole body 21 via the tab 33, the tab 33 is bent alone to form two adjacent opening slots 42 with opposite opening orientations.

[0441] In some embodiments of this application, referring again to FIG3, the battery cell 102 further includes a pressure relief device 6, which is disposed on the housing component 1. Exemplarily, the pressure relief device 6 may be an explosion-proof valve installed on the housing component 1, or it may be integrally formed on a thinned area of ​​the housing component 1. Thus, by providing the pressure relief device 6, when the pressure inside the housing component 1 exceeds a preset value, the pressure can be directionally released through the pressure relief device 6, thereby improving the safety and reliability of the battery cell 102.

[0442] For example, referring to Figure 3, the pressure relief device 6 and the terminal post component 2 are located on the same side. Since the terminal post component 2 is located on the first shell wall 111, when the pressure relief device 6 is also located on the first shell wall 111, the pressure relief device 6 and the terminal post component 2 are located on the same side, for example, both can be located on the top of the battery cell 102, or both can be located on the bottom of the battery cell 102, or both can be located on the same side of the battery cell 102, etc. This simplifies the design of the other shell walls besides the first shell wall 111, and simplifies the structure and processing of the battery cell 102. The shell component 1 can be formed by multiple non-coplanar walls. For example, a cuboid shell component 1 is formed by six walls, one of which is the first shell wall 111. By placing the pressure relief device 6 and the terminal post component 2 on the same wall, they are located on the same side.

[0443] For example, the pressure relief device 6 and the pole member 2 are located on opposite sides. Since the pole member 2 is located on the first shell wall 111, when the pressure relief device 6 is located on a wall of the shell member 1 other than the first shell wall 111, for example, the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, and the pressure relief device 6 is located on the second shell wall 114, or the pressure relief device 6 is located on the shell cover 12, then the pressure relief device 6 and the pole member 2 are located on opposite sides. Thus, there is no need to consider the space occupied by the pressure relief device 6 in the first shell wall 111, thereby reducing the volume of the pole member 2, and the shape and area of ​​the pole member 2 can be flexibly designed as needed. The shell member 1 can be surrounded by multiple non-coplanar walls. For example, a cuboid shell member 1 is surrounded by six walls, one of which is the first shell wall 111. The pressure relief device 6 is located on any other wall other than the first shell wall 111, and the pole member 2 is located on the first shell wall 111, then the two are located on opposite sides.

[0444] According to a second aspect of this application, this application also provides a battery 100, including a battery cell 102 of any of the above-described embodiments. It is worth noting that the battery 100 according to this application embodiment may or may not include a casing 101. Therefore, since the reliability of the battery cell 102 according to this application embodiment is improved, it is beneficial to improve the performance of the battery 100.

[0445] For example, the battery 100 may further include a busbar, and multiple battery cells 102, at least two of which are electrically connected through the busbar. This allows for the series and / or parallel connection of multiple battery cells 102. For instance, when multiple battery cells 102 are connected in series, the negative terminal 2 of one battery cell 102 is connected to the positive terminal 2 of the next battery cell 102 through a busbar, while the positive terminal 2 of the same battery cell 102 is connected to the negative terminal 2 of the previous battery cell 102 through another busbar.

[0446] For example, referring to FIG2, the battery 100 includes a housing 101, and multiple battery cells 102 are housed in the housing 101. The bottom of the housing 101 is a housing bottom plate 1013. The terminal post 2 is disposed on the side of the housing component 1 near the housing bottom plate 1013, or on the side of the housing component 1 away from the housing bottom plate 1013.

[0447] During the use of the battery 100, such as in vehicle use, the bottom plate 1013 of the casing is located at the bottom of the casing 101 in the direction of gravity. Therefore, when the terminal post 2 is located on the side of the casing 1 closest to the bottom plate 1013, it means that the terminal post 2 is located at the bottom of the casing 1 in the direction of gravity; conversely, when the terminal post 2 is located on the side of the casing 1 away from the bottom plate 1013, it means that the terminal post 2 is located at the top of the casing 1 in the direction of gravity. Thus, the relative position of the terminal post 2 and the bottom plate 1013 is not limited, allowing for flexible arrangement of the battery cell 102 and the casing 101.

[0448] Specifically, when the terminal post 2 of the battery cell 102 is located on the side of the housing component 1 facing the bottom plate 1013 of the box, the battery cell 102 is in an inverted state, and the depressurized products are ejected in the direction away from the passenger compartment, which is safer; when the terminal post 2 of the battery cell 102 is located on the side of the housing component 1 close to the bottom plate 1013 of the box, the battery cell 102 is in an upright state, and the electrolyte is not easy to leak.

[0449] According to a third aspect of this application, this application also provides an electrical device including a battery 100 of any of the above-described embodiments, the battery 100 being used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems using the battery 100. Because the performance of the battery 100 is improved, it is beneficial to improve the power consumption performance of the electrical device.

[0450] Below, some specific embodiments according to this application are described.

[0451] Example 1

[0452] Referring to Figures 37 and 38A-38F, the housing component 1 has a receiving cavity 13. The housing component 1 includes a housing body 11 and a housing cover 12. One end of the housing body 11 has an opening 113. The housing cover 12 covers the opening 113 of the housing body 11 to form the receiving cavity 13 together with the housing body 11. The housing cover 12 is a first housing wall 111, and the first housing wall 111 has a mounting hole 112. The pole post component 2 is mounted on the first housing wall 111 and is located at the mounting hole 112.

[0453] Referring to Figures 37 and 38A-38F, the pole piece 2 is a simplified self-sealing type, including a pole body 21, a connecting structure 22, and an insulating sealing structure 23. The connecting structure 22 surrounds the pole body 21, and the insulating sealing structure 23 is insulatingly fitted between the pole body 21 and the connecting structure 22, and includes a sealing structure 231 that seals the pole body 21 and the connecting structure 22. The connecting structure 22 is connected to the first shell wall 111.

[0454] Referring to Figures 37 and 38A-38F, the electrode component 3 includes a stack of multiple electrode assemblies 31 to have an active material coating portion 32 housed in a receiving cavity 13, and an electrode tab portion 33 connected to the active material coating portion 32. The electrode tab portion 33 is connected to the electrode post body 21 via a conductive member 41.

[0455] Referring to Figures 37 and 38A-38F, the conductive element 41 includes a first connecting segment 411 and a second connecting segment 412. The first connecting segment 411 includes two clamping portions 4110. The tab end 331 of the tab portion 33 is clamped between the two clamping portions 4110 and connected to the clamping portions 4110. The second connecting segment 412 is laid on the inner end face 211 of the pole body 21 and connected to the inner end face 211 of the pole body 21. The conductive element 41 is bent at the connection position 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 away from the pole body 21. One of the clamping portions 4110 supports the side of the tab end 331 away from the pole body 21.

[0456] Referring to Figures 37 and 38A-38F, during the processing of the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). The stacked electrode assemblies 31 are bound together using a binding agent (such as blue adhesive). Multiple electrode assemblies 311 of the same polarity are stacked and brought together to form a stacked portion 312, which serves as the electrode tab end 331. The stacked portion 312 is clamped between two clamping portions 4110, and the stacked portion 312 is welded to the clamping portions 4110. Then, the electrode tab 33 is aligned with the active material coating portion 32 facing the mounting hole 1. In the direction of 12, at least the second connecting segment 412 of the conductive element 41 is passed through the mounting hole 112 from the inside of the shell cover 12 to the outside of the shell cover 12; the shell cover 12 is placed below the active material coating part 32, the top of the shell cover 12 is integrally formed with a bracket 121, the lower end of the active material coating part 32 is supported on the bracket 121, and then an insulating film 7 is wrapped around the active material coating part 32, the lower end of the insulating film 7 is heat-fused to the bracket 121; then, the shell body 11 is placed with the opening 113 facing down, and the shell body 11 is fitted over 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. Next, lay the shell 11 flat, with the mounting hole 112 open in the horizontal direction. Connect the second connecting section 412 of the conductive component 41 to the pole member 2 located on the outside of the shell cover 12 on the outside of the shell cover 12. Then, cover the mounting hole 112 with the pole member 2 connected to it from the outside of the shell cover 12. Then flip the shell 11 so that the shell cover 12 is above the shell 11 and the pole member 2 is on top of the shell cover 12. Weld the adapter structure 22 to the shell cover 12 and fix it.

[0457] Example 2

[0458] The housing component 1 has a receiving cavity 13 and includes a shell body 11 that forms the receiving 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. The first shell wall 111 has a mounting hole 112. The pole post component 2 is mounted on the first shell wall 111 and is located at the mounting hole 112.

[0459] Referring to Figures 39A-39D, the pole component 2 is a simplified self-sealing type, including a pole body 21, a connecting structure 22, and an insulating sealing structure 23. The connecting structure 22 surrounds the pole body 21, and the insulating sealing structure 23 is insulatingly fitted between the pole body 21 and the connecting structure 22, and includes a sealing structure 231 that seals the pole body 21 and the connecting structure 22. The connecting structure 22 is connected to the first shell wall 111.

[0460] The electrode component 3 includes a plurality of stacked electrode assemblies 31, having an active material coating portion 32 housed in a receiving cavity 13, and an electrode tab portion 33 connected to the active material coating portion 32, the electrode tab portion 33 being directly connected to the electrode post body 21.

[0461] Referring to Figures 39A-39D, during the processing of the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). Multiple electrode assemblies 31 are stacked and connected with the same polarity of the multilayer tabs 311 to form a gathering portion 313. Then, the electrode component 3 is installed into the housing 11 with the tabs 33 facing the active material coating portion 32 toward the mounting hole 112. As the electrode component 3 is installed into the housing 11, the gathering portion 313 passes through to the outside of the mounting hole 112. The gathering portion 313 is connected to the pole component 2 placed on the outside of the first housing wall 111. Then, the pole component 2 connected with the gathering portion 313 covers the mounting hole 112 from the outside of the first housing wall 111. Finally, the adapter structure 22 is welded and fixed to the first housing wall 111.

[0462] The welding position between the electrode component 2 and the conductive part 4 is located outside the housing 11, which can prevent conductive debris formed during the welding process from entering the housing 11 and damaging the electrode component 3.

[0463] Example 3

[0464] The housing component 1 has a receiving cavity 13 and includes a first housing wall 111 that forms the receiving cavity 13. The first housing wall 111 has a mounting hole 112. The pole post component 2 is mounted on the first housing wall 111 and is located at the mounting hole 112. In this embodiment, the specific location of the first housing wall 111 is not limited. For example, it can be a wall of the housing body 11 or a housing cover 12.

[0465] Referring to Figures 40A-40D, the pole piece 2 is a simplified self-sealing type, including a pole body 21, a connecting structure 22, and an insulating sealing structure 23. The connecting structure 22 surrounds the pole body 21, and the insulating sealing structure 23 is insulatingly fitted between the pole body 21 and the connecting structure 22, and includes a sealing structure 231 that seals the pole body 21 and the connecting structure 22. The connecting structure 22 is connected to the first shell wall 111.

[0466] The electrode component 3 includes a plurality of stacked electrode assemblies 31, having an active material coating portion 32 housed in a receiving cavity 13, and an electrode tab portion 33 connected to the active material coating portion 32, the electrode tab portion 33 being directly connected to the electrode post body 21.

[0467] Referring to Figures 40A-40D, during the processing of the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). The multiple electrode assemblies 31 are stacked and connected with multilayer tabs 311 of the same polarity to form a gathering portion 313. Then, the gathering portion 313 is connected to the pole post component 2. The pole post component 2 connected with the gathering portion 313 is passed through the mounting hole 112 from the inside of the first shell wall 111 to the outside of the first shell wall 111. Then, the pole post component 2 connected with the gathering portion 313 is covered by the mounting hole 112 from the outside of the first shell wall 111. Finally, the adapter structure 22 is welded and fixed to the first shell wall 111.

[0468] Example 4

[0469] The housing component 1 has a receiving cavity 13 and includes a first housing wall 111 that forms the receiving cavity 13. The first housing wall 111 has a mounting hole 112. The pole post component 2 is mounted on the first housing wall 111 and is located at the mounting hole 112. In this embodiment, the specific location of the first housing wall 111 is not limited. For example, it can be a wall of the housing body 11 or a housing cover 12.

[0470] Referring to Figures 41A-41D, the pole piece 2 is a simplified self-sealing type, including a pole body 21, a connecting structure 22, and an insulating sealing structure 23. The connecting structure 22 surrounds the pole body 21, and the insulating sealing structure 23 is insulatingly fitted between the pole body 21 and the connecting structure 22, and includes a sealing structure 231 that seals the pole body 21 and the connecting structure 22. The connecting structure 22 is connected to the first shell wall 111.

[0471] The electrode component 3 includes a plurality of stacked electrode assemblies 31, having an active material coating portion 32 housed in a receiving cavity 13, and an electrode tab portion 33 connected to the active material coating portion 32, the electrode tab portion 33 being directly connected to the electrode post body 21.

[0472] Referring to Figures 41A-41D, during the processing of the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). Multiple electrode assemblies 31 are stacked and connected with multilayer tabs 311 of the same polarity to form a gathering part 313. Then, the gathering part 313 is connected to the terminal post 2. The terminal post 2 with the electrode assembly 3 connected and the electrode assembly 3 are placed inside the first shell wall 111. Then, the terminal post 2 with the electrode assembly 3 connected is covered with the mounting hole 112 from the inside of the first shell wall 111. After that, the adapter structure 22 is welded and fixed to the first shell wall 111.

[0473] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0474] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, wherein, include: The housing component includes a first housing wall on which mounting holes are formed; Electrode components are housed within the housing component; The electrode post component is located on the same side as the first housing wall of the electrode component and is installed at the mounting hole. The electrode post component includes an electrode post body, a transition structure, and an insulating and sealing structure. The electrode post body is connected to the electrode component. The transition structure surrounds the electrode post body and is connected to the first housing wall. The insulating and sealing structure is insulating and sealingly fitted between the transition structure and the electrode post body.

2. The battery cell according to claim 1, wherein, The insulating sealing structure includes a sealing structure member, at least a portion of which is sandwiched between the adapter structure and the pole body in the inward and outward directions of the first shell wall.

3. The battery cell according to claim 1 or 2, wherein, The insulating sealing structure includes a sealing structure component, which is arranged around the periphery of the adapter structure near the pole body.

4. The battery cell according to any one of claims 1-3, wherein, The pole body includes a peripheral portion, and the adapter structure is clamped on both sides of the peripheral portion in the inward and outward directions of the first shell wall by the insulating sealing structure; The insulating sealing structure includes a sealing structure member that extends circumferentially around the periphery and is held between the periphery and the transition structure.

5. The battery cell according to claim 4, wherein, At least a portion of the sealing structure is disposed on the side of the peripheral portion near or away from the electrode component, so as to be clamped between the peripheral portion and the transition structure along the inward and outward directions of the first shell wall.

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

7. The battery cell according to claim 5, wherein, The sealing structure is an integral structure and is wrapped around the peripheral portion, located on the side of the peripheral portion closer to the electrode component and the side away from the electrode component, respectively. The adapter structure is clamped on both sides of the peripheral portion along the inward and outward directions by the sealing structure.

8. The battery cell according to claim 4 or 5, wherein, The adapter structure includes a first adapter ring and a second adapter ring. The second adapter ring is disposed on the side of the first adapter ring that is 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 ends of the first adapter ring near the pole body and the ends of the second adapter ring near the pole body are spaced apart along the inner and outer directions, so as to be clamped on both sides of the peripheral portion by the insulating sealing structure along the inner and outer directions, 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, wherein, The insulating sealing structure further includes a first insulating member, at least a portion of which is clamped between the first transition ring and the peripheral portion, and the second transition ring is insulated from and fixedly fitted to the peripheral portion through the first insulating member.

10. The battery cell according to claim 9, wherein, The first insulating component is injection molded to connect with the pole body, and the first insulating component is injection molded to connect with the second adapter ring.

11. The battery cell according to claim 9, wherein, 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 inward and outward directions.

12. The battery cell according to claim 8, wherein, The sealing structure is an integral structure and is wrapped around the peripheral portion, with the first and second adapter rings respectively located on the side of the peripheral portion close to the electrode component and the side away from the electrode component. The first adapter ring and the second adapter ring are respectively clamped on the two sides of the sealing structure away from the peripheral portion along the inward and outward directions.

13. The battery cell according to any one of claims 8-12, wherein, The first adapter ring is connected to the first shell wall, the second adapter ring is disposed on the 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, wherein, Both the first adapter ring and the second adapter ring are metal rings and are welded together, and the first adapter ring is welded to the first shell wall.

15. The battery cell according to any one of claims 8-14, wherein, The adapter structure also includes a first insulating frame, which is connected to the side of the first adapter ring near the electrode component.

16. The battery cell according to any one of claims 8-15, wherein, The first adapter ring has a first annular groove on the side surface near the second adapter ring that matches the second adapter ring, and the second adapter ring is embedded in the first annular groove.

17. The battery cell according to claim 4 or 5, wherein, The adapter structure includes a third adapter ring, which includes an integrally formed first extension and a second extension. The ends of the first extension near the pole body and the ends of the second extension near the pole body are spaced apart 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, and the sealing structure is clamped between at least one of the first extension and the second extension and the peripheral portion.

18. The battery cell according to claim 17, wherein, The insulating sealing structure further includes a first insulating member, at least a portion of which is sandwiched between the first extension and the peripheral portion, and the second extension is insulated from and fixedly fitted to the peripheral portion by the first insulating member.

19. The battery cell according to claim 18, wherein, The second extension rivets the first insulating member against the peripheral portion.

20. The battery cell according to claim 18, wherein, The first insulating member is injection molded to be connected to the pole body, and the first insulating member is injection molded to be connected to the second extension. The first extension rivets the sealing structure to the peripheral portion.

21. The battery cell according to claim 17, wherein, The sealing structure is an integral structure and is wrapped around the peripheral portion, with the first extension and the second extension respectively located on the side of the peripheral portion close to the electrode component and the side away from the electrode component. The first extension and the second extension are respectively clamped in the inward and outward directions on both sides of the sealing structure away from the peripheral portion.

22. The battery cell according to claim 21, wherein, One of the first extension and the second extension rivets the sealing structure against the peripheral portion.

23. The battery cell according to any one of claims 17-22, wherein, One of the first extension and the second extension is a pre-formed part, and the other is a riveting part. The fixed end of the pre-formed part is connected to the first shell wall, and the fixed end of the riveting part is connected to the pre-formed part. The riveting part rivets the insulating and sealing structure against the peripheral part.

24. The battery cell according to claim 23, wherein, The preformed part includes an outer ring part and an inner ring part. The outer ring part is connected to the first shell wall and is arranged around the riveting part and the inner ring part. The inner ring part and the riveting part are respectively clamped on both sides of the peripheral part along the inner and outer directions by the insulating sealing structure. The riveting part and the inner ring part are respectively connected to the outer ring part.

25. The battery cell according to claim 23, wherein, The preformed part 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 riveting forming part and the bent portion. The bent portion and the riveting forming part are respectively clamped on both sides of the peripheral part along the inner and outer directions by the insulating sealing structure. The bent portion is bent and connected between the riveting forming part and the outer ring portion.

26. The battery cell according to any one of claims 17-25, wherein, At least a portion of the sealing structure is sandwiched between the third adapter ring and the side of the peripheral portion closest to the electrode component.

27. The battery cell according to any one of claims 17-26, wherein, The third adapter ring is an integrally formed metal ring, and the third adapter ring is welded to the first shell wall.

28. The battery cell according to any one of claims 17-27, wherein, The adapter structure also includes a second insulating frame, which is connected to the side of the third adapter ring near the electrode component.

29. The battery cell according to any one of claims 4-28, wherein, The sealing structure includes a first part, which is disposed on the side of the peripheral portion near the electrode component and is sandwiched between the peripheral portion and the transition structure along the inward and outward directions.

30. The battery cell according to claim 29, wherein, The electrode body includes a body portion, a peripheral portion surrounding the body portion, and the body portion protruding relative to the peripheral portion toward the electrode component. The sealing structure further includes a second portion connected to one end of the first portion near the body portion and extending relative to the first portion toward the electrode component, thereby spacing between the outer peripheral surface of the body portion and the transition structure.

31. The battery cell according to claim 29 or 30, wherein, The sealing structure further includes a third part, which is connected to the end of the first part that is away from the electrode body, and extends relative to the first part in a direction away from the electrode component to the outer peripheral region of the peripheral portion, and is sealed between the outer peripheral surface of the peripheral portion and the transition structure.

32. The battery cell according to any one of claims 4-31, wherein, The adapter 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 any one of claims 1-3, wherein, The adapter structure includes a mating ring portion, and the pole body includes a through portion passing through the mating ring portion, and a first limiting portion and a second limiting portion connected to the through portion and clamped on both sides of the mating ring portion. The insulating sealing structure includes a sealing structure that extends circumferentially around the mating ring and is held between the mating ring and the pole body.

34. The battery cell according to claim 33, wherein, At least a portion of the sealing structure is disposed on the side of the mating ring portion near 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 mating ring portion.

35. The battery cell according to claim 34, wherein, The insulating sealing structure further includes a second insulating member, wherein one of the first limiting portion and the second limiting portion clamps the sealing structure member between the mating ring portion, and the other of the first limiting portion and the second limiting portion clamps the second insulating member between the mating ring portion.

36. The battery cell according to claim 34, wherein, The sealing structure is an integral structure that surrounds the mating ring portion, with the sealing structure positioned on the side of the mating ring portion closer to the electrode component and the side away from the electrode component, respectively. The electrode post body is clamped on both sides of the mating ring portion along the inward and outward directions by the sealing structure.

37. The battery cell according to any one of claims 33-36, wherein, At least a portion of the sealing structure is clamped between the first limiting portion and the mating ring portion, and the second limiting portion and the through portion are assembled and connected to the mating ring portion on the side opposite to the first limiting portion.

38. The battery cell according to any one of claims 33-36, wherein, At least a portion of the sealing structure is clamped between the first limiting portion and the mating ring portion, the second limiting portion is integral with the through portion, and the second limiting portion rivets the insulating sealing structure against the mating ring portion.

39. The battery cell according to claim 38, wherein, The electrode body includes a first electrode component and a second electrode component. The second electrode component includes the through portion, the first limiting portion and the second limiting portion. The through portion surrounds a mating hole. The first electrode component is installed on the side of the second electrode component away from the electrode component and covers the mating hole. The electrode component is connected to the first electrode component through a conductive portion extending into the mating hole.

40. The battery cell according to claim 33, wherein, The first limiting portion is clamped on the side of the mating ring portion near the electrode component, and the sealing structure includes a fifth portion clamped between the mating ring portion and the first limiting portion.

41. The battery cell according to claim 40, wherein, The sealing structure further includes a sixth part, which is connected to the end of the fifth part near the electrode body and extends relative to the fifth part in a direction away from the electrode component, so as to be spaced between the outer peripheral surface of the through portion and the inner peripheral surface of the mating ring portion.

42. The battery cell according to claim 40 or 41, wherein, The adapter structure includes a fourth adapter ring, which includes a body ring portion and a mating ring portion. The body ring portion is disposed around the mating ring portion, and the mating ring portion protrudes relative to the 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 near the electrode component. The sealing structure component is fitted into the third annular groove.

43. The battery cell according to claim 42, wherein, The sealing structure further includes a seventh part, which is connected to the end of the fifth part that is away from the electrode body and extends toward the electrode component relative to the fifth part, so as to seal between the outer peripheral surface of the first limiting part and the inner peripheral surface of the body ring.

44. The battery cell according to any one of claims 33-43, wherein, The adapter structure further includes a fourth adapter ring, which is a metal ring and includes the mating ring portion. The fourth adapter ring is welded to the first shell wall.

45. The battery cell according to any one of claims 33-44, wherein, The adapter structure also includes a third insulating frame, which is connected to the side of the fourth adapter ring near the electrode component.

46. ​​The battery cell according to any one of claims 1-45, wherein, The adapter structure is formed as an elongated strip extending along the length of the first shell wall, and the outline shape of the pole body matches the outline shape of the adapter structure.

47. The battery cell according to any one of claims 1-45, wherein, The transition structure is formed as an elongated strip extending along the length of the first shell wall, and the pole body is located in the center of the transition structure and has a circular outline.

48. The battery cell according to any one of claims 1-47, wherein, The position of the inner end face of the adapter structure adjacent to the pole body is a surrounding area around the pole body, and the surrounding area is flush with the inner end face of the pole body.

49. The battery cell according to any one of claims 1-47, wherein, The inner end face of the adapter structure is located near the electrode body in a surrounding area, and the inner end face of the electrode body protrudes from the surrounding area in a direction close to the electrode component.

50. The battery cell according to claim 47, wherein, The position of the inner end face of the adapter structure adjacent to the electrode body is a surrounding area around the electrode body, and the inner end face of the electrode body protrudes from the surrounding area in a direction close to the electrode component. The electrode component is connected to the electrode post component via a conductive part. The conductive part includes an electrode tab and a conductive element connected to the electrode tab. The conductive element includes a first conductive segment laid on the inner end face of the electrode post body and a second conductive segment offset from the inner end face of the electrode post body. The second conductive segment protrudes relative to the first conductive segment in a direction away from the electrode component. The electrode tab is connected to the second conductive segment.

51. The battery cell according to any one of claims 1-50, wherein, The electrode post component forms a receiving groove that is recessed relative to the first shell wall in a direction away from the electrode component and open in a direction towards the electrode component. The electrode component is connected to the electrode post component through a conductive part. At least a portion of the conductive part is received in the receiving groove and connected to the electrode post body.

52. The battery cell according to claim 51, wherein, The receiving groove is formed on the side of the electrode body and the adapter structure near the electrode component. The adapter structure protrudes relative to the first shell wall in a direction away from the electrode component, so that the receiving 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 or 52, wherein, The surface of the electrode body facing the electrode component is the inner end face of the electrode body, and the inner end face of the electrode body participates in forming the receiving groove. The conductive part is connected to the inner end face of the electrode body.

54. The battery cell according to claim 1, wherein, The adapter structure includes a connecting end connected to the first shell wall, and the adapter structure includes a raised portion protruding relative to the connecting end in a direction away from the pole member, and the pole body is mounted on the raised portion.

55. The battery cell according to claim 54, wherein, The raised portion and the side of the transition structure near the electrode component have a receiving groove. The electrode component is connected to the pole component through a conductive part. At least a portion of the conductive part is received in the receiving groove and connected to the pole body.

56. The battery cell according to claim 1, wherein, The adapter structure includes a connecting end connected to the first shell wall, and the adapter structure includes an inner recessed portion that is recessed relative to the connecting end toward the pole member, and the pole body is installed in the inner recessed portion.

57. The battery cell according to claim 56, wherein, The inner recessed portion has a surface near the electrode component that forms a surrounding area around the electrode body. The inner end face of the electrode body protrudes from the surrounding area in the direction close to the electrode component, or the surrounding area is flush with the inner end face of the electrode body.

58. The battery cell according to any one of claims 1-57, wherein, The adapter structure includes a connecting end that connects to the first shell wall, the connecting end having a fourth annular groove that fits into the other of the first shell wall, the fourth annular groove extending around the circumference of the mounting hole and opening in a direction away from the electrode component.

59. The battery cell according to any one of claims 1-58, wherein, The housing component has a receiving cavity, and the housing component includes a shell body that participates in forming the receiving cavity. The shell body is semi-closed cylindrical and has an opening at one end. The end of the shell body opposite to the opening serves as the first shell wall. Alternatively, the housing component includes a shell cover that participates in forming the receiving cavity. The shell cover is flat and serves as the first shell wall.

60. The battery cell according to any one of claims 1-59, wherein, The electrode component includes an active material coating portion housed in the housing component, and an electrode tab portion connected to the active material coating portion, the electrode tab portion extending to the electrode post body and connected to the electrode post body.

61. The battery cell according to claim 60, wherein, The side surface of the electrode body closest to the electrode component is the inner end face of the electrode body. The tab portion includes a gathered portion formed by stacking and connecting multiple layers of tab sheets. At least a portion of the gathered portion is laid on the inner end face of the electrode body and connected to the inner end face of the electrode body.

62. The battery cell according to any one of claims 1-59, wherein, The electrode component includes an active material coating portion housed in the housing component, and an electrode tab portion connected to the active material coating portion, the electrode tab portion being connected to the electrode post body via a conductive element.

63. The battery cell according to claim 62, wherein, The conductive component includes a first connecting segment, which includes two clamping portions. The electrode portion includes an electrode end, which is clamped between the two clamping portions and connected to the clamping portions.

64. The battery cell according to claim 63, wherein, The surface of the electrode body near the electrode component is the inner end face of the electrode body. The conductive element includes a second connecting segment, which is laid on the inner end face of the electrode body and connected to the inner end face of the electrode body. The conductive element 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 electrode body. One of the clamping portions is supported on the side of the electrode tab end away from the electrode body.

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

66. The battery cell according to claim 65, wherein, The surface of the electrode body near the electrode component is the inner end face of the electrode body. The first connecting section is supported on the side of the folding part away from the electrode body, so that the folding part is clamped between the inner end face of the electrode body and the first connecting section.

67. The battery cell according to any one of claims 1-59, wherein, The electrode component includes an active material coating portion housed within the housing component. The active material coating portion is connected to the electrode body via a conductive portion. The conductive portion is bent to form at least two opening slots, wherein the openings of the two opening slots face different directions and are adjacent in the direction from the electrode body to the active material coating portion.

68. The battery cell according to claim 67, wherein, The electrode component includes a tab connected to the active material coating portion, and the conductive portion is connected to the electrode post body through the tab. The tab is bent independently to form two adjacent opening slots with opposite opening directions. Alternatively, the electrode component includes a tab connected to the active material coating portion, and the conductive portion includes the tab and a conductive element connected to the tab. The tab is connected to the electrode post body through the conductive element, and the conductive element and the tab are bent together to form two adjacent opening slots with opposite opening directions.

69. The battery cell according to any one of claims 1-68, wherein, It also includes a pressure relief device, which is located on the housing component and on the same side or opposite side as the pole component.

70. A battery, wherein, Includes the battery cell according to any one of claims 1-69.

71. The battery according to claim 70, wherein, The battery includes a housing, and multiple battery cells are housed within the housing. The bottom of the housing is a bottom plate. The terminal post is located on the side of the housing component near the bottom plate of the housing, or on the side of the housing component away from the bottom plate of the housing.

72. An electrical appliance, wherein, Includes the battery according to claim 70 or 71.

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