Battery cells, batteries and electrical devices

Abstract

A battery cell, a battery and an electrical device, belonging to the field of battery technology. The battery cell includes: a shell component, a pole component and an electrode component. The shell component has a housing cavity and includes a shell body that participates in forming the housing cavity. The shell body is an integral part and has an opening at one end. The end of the shell body opposite to the opening is a first shell wall. The pole component is installed on the first shell wall. The electrode component is accommodated in the housing cavity and connected to the pole component. This battery cell is conducive to improving the connection reliability of the shell body and the shell cover. There is no need to increase the wall thickness of the two to increase the connection reliability of the two, which is conducive to reducing weight and material costs and improving the reliability of the battery cell.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. Among them, power batteries include several battery cells. However, the reliability of battery cells needs to be improved, which makes the reliability of power batteries also need to be improved. Utility Model Content

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

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell component, a pole component and an electrode component, the shell component having a accommodating cavity, and comprising a shell body that participates in forming the accommodating cavity, the shell body being an integral piece and having an opening at one end, and the end of the shell body opposite to the opening being a first shell wall; the pole component is mounted on the first shell wall; the electrode component is received in the accommodating cavity and connected to the pole component.

[0005] In the above technical solution, since the electrode component housed in the shell component needs to be connected to the pole component installed on the first shell wall. Therefore, when the battery vibrates or deforms, the pole component connected through the converging component will be pulled. Since the pole component is arranged on the end wall of the shell body opposite to the opening, the force applied to the pole component will be preferentially transmitted to the shell body as an integral part, and will not directly act on the structure matched with the shell body, such as the shell cover, so that not only can the distance of the force transmitted to the connection between the shell body and the shell cover be extended, but also the shell body will preferentially deform when subjected to force to reduce the force applied to the connection between the shell body and the shell cover, thereby effectively reducing the probability of cracking at the connection between the shell body and the shell cover during the use of the battery, and improving the reliability of the battery cell. In addition, the shell body is an integral part, which is not easy to crack due to stress concentration during pulling and vibration, so there is no need to increase the wall thickness of the wall body in order to increase the connection reliability of each wall body, which is conducive to reducing weight and material costs, and is also conducive to miniaturization of battery cells, or improving the energy density of battery cells.

[0006] In some embodiments, the pole component includes a pole body, a transition structure and an insulating structure, the transition structure surrounds the pole body and is connected to the first shell wall, the insulating structure is insulated between the transition structure and the pole body, and the electrode component is connected to the pole body.

[0007] In the above technical solution, the structure of the pole component is simple and easy to process. Since it includes two parts, the pole body and the adapter structure, the shape and size of the pole body and the adapter structure can be separately designed based on different design points. For example, a runway-shaped adapter structure can be used in conjunction with a circular pole body, or a runway-shaped adapter structure can be used in conjunction with a runway-shaped pole body, so as to flexibly adapt to the connection requirements of different forms of shell components and electrode components, thereby increasing the scope of application of the pole component.

[0008] In some embodiments, the transition structure is formed into a long strip extending along the length direction of the first shell wall, and the contour shape of the pole body matches the contour shape of the transition structure; or, the transition structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is arranged at the length center of the transition structure and is circular.

[0009] In the above technical solution, when the contour shape of the pole body is formed into a long strip that matches the contour shape of the adapter structure, the area of ​​the pole body is large, which is conducive to increasing the connection area between the conductive part and the pole body, thereby improving the charging performance. When the pole body is arranged at the length center of the long strip adapter structure and is circular, the connection force between the pole body and the adapter structure can be evenly distributed on the circumference, which can improve the uniformity of the force at the connection between the pole body and the adapter structure, thereby improving the connection reliability between the pole body and the adapter structure.

[0010] In some embodiments, the insulating structure is sealingly fitted between the transition structure and the pole body.

[0011] In the above technical solution, since the shell component needs to have a sealing requirement to prevent the electrolyte from leaking to the outside of the shell component. Therefore, the insulating structure can not only insulate the adapter structure from the pole body, but also make the matching position of the adapter structure and the pole body present a sealed state to achieve the sealing function of the shell component. By sealing the insulating structure between the adapter structure and the pole body, when the battery cell is sealed, it is only necessary to connect the adapter structure to the first shell wall without applying a large pressure to the first shell wall, thereby reducing the force on the first shell wall and playing a role in protecting the shell component, which is conducive to reducing the wall thickness of the shell component and reducing material costs. Moreover, since the first shell wall is the end of the shell body opposite to the opening, the force at the connection between the first shell wall and the second shell wall can be reduced, as well as the force on the second shell wall, which is conducive to ensuring the reliability of the shell body and reducing the wall thickness and cost of the shell body.

[0012] In some embodiments, the insulating structure includes a sealing structure, which is arranged around the peripheral side of the transition structure facing the pole body and is at least partially clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall.

[0013] In the above technical solution, by setting at least part of the sealing structure to be clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall, an axial seal between the transition structure and the pole body is achieved. The axial seal can achieve a more reliable sealing effect and improve the leakage problem at the matching position of the transition structure and the pole body. The embodiment of the present application can reduce the axial force on the first shell wall by integrating the axial seal into the pole component. Moreover, by setting the sealing structure ring on the inner ring of the transition structure, the sealing structure can be close to the matching position of the transition structure and the pole body, which is conducive to sealing the matching position of the transition structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily achieving compression sealing on it. The seal is not easy to fail, and the sealing effect is improved.

[0014] In some embodiments, the pole body includes a peripheral portion, the transition structure is clamped on both sides of the peripheral portion in the inner and outer directions of the first shell wall through the insulating structure, and at least part of the sealing structure is clamped between the side of the peripheral portion facing the electrode component and the transition structure.

[0015] In the above technical solution, the structure of the pole component is simple and easy to process, and the relative fixation and insulation matching between the pole body and the adapter structure can be simply and effectively achieved. The peripheral portion of the pole body and the adapter structure are used to clamp the sealing structure, so that the sealing structure can be in the matching position of the adapter structure and the pole body, which is conducive to sealing the matching position of the adapter structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily achieving compression sealing on it. The seal is not easy to fail, and the sealing effect is improved. Moreover, since at least part of the sealing structure is clamped between the side of the peripheral portion facing the electrode component and the adapter structure, the sealing structure can be sealed from the side of the peripheral portion facing the accommodating cavity, which can more effectively inhibit the leakage of electrolyte from the matching position of the pole body and the adapter structure, thereby improving the sealing effect.

[0016] In some embodiments, the transition structure includes a mating ring portion, the pole body includes a penetration portion passing through the mating ring portion, and an inner limiting portion and an outer limiting portion connected to the penetration portion and clamped on the inner and outer sides of the mating ring portion, and at least a portion of the sealing structure is clamped between the mating ring portion and the inner limiting portion.

[0017] In the above technical solution, the structure of the pole component is simple and easy to process, and the relative fixation and insulation matching between the pole body and the adapter structure can be simply and effectively achieved. The sealing structure is clamped by the matching position of the pole body and the matching ring part, so that the sealing structure can be in the matching position of the adapter structure and the pole body, which is conducive to sealing the matching position of the adapter structure and the pole body in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure, reducing the sealing area, and easily achieving compression sealing on it. The seal is not easy to fail, and the sealing effect is improved. Moreover, since at least part of the sealing structure is clamped between the matching ring part and the inner limit part, the sealing structure can be sealed from the side of the matching ring part facing the accommodating cavity, which can more effectively inhibit the leakage of electrolyte from the matching position of the pole body and the adapter structure, thereby improving the sealing effect.

[0018] In some embodiments, a mounting hole is provided on the first shell wall, a sealing ring is arranged around the mounting hole, and the sealing ring is clamped between the pole component and the first shell wall.

[0019] In the above technical solution, the pole component has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall.

[0020] In some embodiments, a mounting hole is provided on the first shell wall, the pole component is covered in the mounting hole, and an edge of the transition structure overlaps one side of the first shell wall in the wall thickness direction.

[0021] In the above technical solution, the assembly of the adapter structure and the first shell wall is facilitated, and the production efficiency is improved. When the edge of the adapter structure overlaps the side of the first shell wall away from the electrode component, it is convenient to assemble and connect the pole component and the first shell wall, which is conducive to improving the connection reliability between the pole component and the first shell wall. When the edge of the adapter structure overlaps the side of the first shell wall facing the electrode component, the electrode component and the pole component can be installed into the shell body together, and the pole component does not need to pass through the installation hole, thereby reducing the operation steps and reducing the difficulty of operation.

[0022] In some embodiments, the edge of the transition structure overlaps the side of the first shell wall facing away from the electrode component, the first shell wall has a first recessed groove arranged around the mounting hole, the first recessed groove is open in the direction away from the electrode component, and the edge of the transition structure has a flange portion embedded in the first recessed groove.

[0023] In the above technical solution, it is convenient to support and position the connection between the transition structure and the first shell wall, which is beneficial for the welding connection between the two from the outside of the first shell wall.

[0024] In some embodiments, the edge of the transition structure overlaps the side of the first shell wall away from the electrode component, the mounting hole is an elongated hole, and the pole component is formed into an elongated structure matching the shape of the mounting hole.

[0025] In the above technical solution, the space required for the flipping movement of the pole component is relatively small, which can reduce the space required for the flipping of the pole component, thereby shortening the length of the conductive part, saving materials, and reducing costs. It can also reduce the redundancy of the conductive part and reduce the space occupied by the conductive part in the accommodating cavity, which is beneficial to improving the energy density of the battery cell.

[0026] In some embodiments, the edge of the transition structure overlaps the side of the first shell wall facing the electrode component, the edge of the transition structure has a second groove open in the direction away from the electrode component, the first shell wall includes an overlapping portion protruding into the mounting hole, and the overlapping portion is embedded in the second groove.

[0027] In the above technical solution, it is convenient to support and position the connection between the pole component and the first shell wall, which is beneficial for the welding connection between the two from the outside of the first shell wall.

[0028] In some embodiments, the transition structure is connected to the first shell wall by welding.

[0029] In the above technical solution, the adapter structure and the first shell wall are connected by welding, which is convenient for processing and can better ensure the connection reliability between the adapter structure and the first shell wall.

[0030] In some embodiments, a weld formed by welding the transition structure to the first shell wall is exposed on a side of the first shell wall facing away from the electrode component.

[0031] In the above technical solution, welding can be performed from the outside of the first shell wall, thereby facilitating the welding operation and increasing the welding space.

[0032] In some embodiments, the pole component is surrounded by a receiving groove that is recessed relative to the first shell wall in a direction away from the electrode component and open in a direction toward the electrode component. The electrode component is connected to the pole component through a conductive portion, and at least a portion of the conductive portion is received in the receiving groove and connected to the pole body.

[0033] In the above technical solution, by providing a receiving groove to receive the conductive part, the space occupied by the conductive part in the receiving cavity can be reduced, so that the receiving cavity has a larger space to receive the active material coating part, which is conducive to increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell. Moreover, since the receiving groove is open toward the direction of the electrode component, the conductive part can be easily extended into the receiving groove, reducing the difficulty of operation.

[0034] In some embodiments, the accommodating groove is formed on the side of the pole body and the transition structure facing the electrode component, and the transition structure bulges relative to the first shell wall in the direction away from the electrode component so that the accommodating groove is recessed relative to the first shell wall in the direction away from the electrode component.

[0035] In the above technical solution, by processing the adapter structure into a protruding bulge, a part of the accommodating groove is formed on the side of the pole body facing the electrode component, and another part of the accommodating groove is formed on the side of the adapter structure facing the electrode component, and the accommodating groove is in a shape that is recessed relative to the first shell wall in the direction away from the electrode component, so that the side of the pole body facing the electrode component and the side of the adapter structure facing the electrode component both have a space accommodating groove conductive part. In this way, it is not only convenient to accommodate the conductive part to a greater extent, but also conducive to the design of diversified forms of the conductive part.

[0036] In some embodiments, the surface of one end of the pole body facing the electrode component is the inner end surface of the pole body, the inner end surface of the pole body participates in forming the accommodating groove, and the conductive part is connected to the inner end surface of the pole body.

[0037] In the above technical solution, at least part of the receiving groove is surrounded by the surface of the pole body facing the electrode component, and the conductive part received in the receiving groove can be easily contacted and connected to the pole body, thereby improving the connection convenience and simplifying the structure.

[0038] In some embodiments, the position of the inner end face of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, the surrounding area is flush with the inner end face of the pole body, or the inner end face of the pole body protrudes from the surrounding area in the direction of the electrode component, or the surrounding area protrudes from the inner end face of the pole body in the direction of the electrode component.

[0039] In the above technical solution, the relative position of the surrounding area and the inner end surface of the pole body is not limited, and a diverse and flexible design can be achieved.

[0040] In some embodiments, the pole component includes a pole body, the pole body includes a first pole component and a second pole component, the second pole component is installed on the first shell wall and defines a matching hole, the first pole component is installed on the side of the second pole component away from the electrode component and covers the matching hole, and the electrode component is connected to the first pole component through a conductive part extending into the matching hole.

[0041] In the above technical solution, when assembling the battery cell, the first pole member and the conductive part can be connected first, and the second pole member and the first shell wall can be connected, and then the first pole member and the second pole member can be connected, so that the pole member and the electrode member can be installed on the shell body, which is conducive to shortening the pole ear part.

[0042] In some embodiments, the first shell wall has a mounting hole, the second pole piece is passed through the mounting hole and clamped on both inner and outer sides of the first shell wall, and an insulating sealing component is provided between the second pole piece and the first shell wall.

[0043] In the above technical solution, the connection between the second pole piece and the first shell wall is more reliable, and by providing an insulating sealing component, the second pole piece can be made of metal material, which is beneficial to increase the conductive area of ​​the pole body.

[0044] In some embodiments, the pole component includes a pole body, the surface of the pole body facing the electrode component at one end is the inner end surface of the pole body, the electrode component is connected to the inner end surface of the pole body through a conductive part, and the conductive part is partially laid on the inner end surface of the pole body.

[0045] In the above technical solution, by laying at least part of the conductive part on the inner end surface of the pole body, the at least part of the conductive part is in a flat and stretched state, and the projection of at least part of the conductive part falls on the inner end surface of the pole body, which is beneficial to improve the connection reliability between the conductive part and the pole body, and is beneficial to increase the connection area between the conductive part and the pole body, thereby improving the conductivity.

[0046] In some embodiments, the inner end surface of the pole body is inclined relative to the axial cross section of the electrode component, and the axial cross section of the electrode component is perpendicular to the direction of the electrode tab of the electrode component.

[0047] In the above technical solution, before at least part of the conductive part is laid on the inner end face of the pole body, the pole component can be adjusted to the point where the inner end face of the pole body is parallel to the direction of the pole ear of the electrode component, so as to facilitate laying at least part of the conductive part on the inner end face of the pole body, providing a larger welding operation space, and at this time, the connection direction of the two ends of the pole body is inclined to the direction of the pole ear of the electrode component, so that after the conductive part is connected to the pole body, the pole component is flipped as a whole by less than 90°, which can satisfy the solution of making the connection direction of the above-mentioned two ends of the pole body parallel to the first shell wall, thereby reducing the flipping angle of the pole component relative to the solution of paralleling the inner end face of the pole body to the axial section of the electrode component, which is beneficial to shortening the length of the conductive part.

[0048] In some embodiments, the pole component includes a pole body, the electrode component includes an active material coating portion accommodated in the accommodating cavity, and a pole ear portion connected to the active material coating portion, and the pole ear portion extends to the pole body and is connected to the pole body.

[0049] In the above technical solution, the use of the conductive member can be omitted, and the connection process between the conductive member and the pole ear portion can be omitted.

[0050] In some embodiments, the surface of one end of the pole body facing the electrode component is the inner end surface of the pole body, and the pole ear portion includes a gathered portion formed by stacking and connecting multiple layers of pole ear sheets, and at least part of the gathered portion is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body.

[0051] In the above technical solution, by laying at least part of the gathered portion on the inner end surface of the pole body and connecting with the inner end surface of the pole body, it is beneficial to increase the connection area, connection reliability and current carrying capacity between the pole ear and the pole body.

[0052] In some embodiments, the pole component includes a pole body, the electrode component includes an active material coating portion accommodated in the accommodating cavity, and a pole ear portion connected to the active material coating portion, and the pole ear portion is connected to the pole body through a conductive member.

[0053] In the above technical solution, the pole ear part and the pole body are indirectly connected by a conductive part, which can shorten the length of the pole ear part and improve the problems of wrinkling, bending and breaking of the pole ear piece. Moreover, the shape and material of the conductive part can be flexibly designed to reduce the difficulty of connecting the conductive part and the pole body and improve the convenience of connecting the conductive part and the pole body.

[0054] In some embodiments, the conductive member includes a first connecting section, the first connecting section includes two clamping portions, the pole lug portion includes a pole lug end portion, the pole lug end portion is clamped between the two clamping portions and connected to the clamping portions.

[0055] In the above technical solution, the two clamping parts can be used to limit the end of the pole ear, thereby improving the connection reliability of the multi-layer pole ear sheets in the end of the pole ear. In addition, in some examples, by providing two clamping parts, the end of the pole ear clamped between the two clamping parts can be in the state of a laminated part, and the step of connecting the multi-layer pole ear sheets in the laminated part to form a gathered part can be omitted, thereby simplifying the processing process and improving the processing efficiency.

[0056] In some embodiments, the surface of one end of the pole body facing the electrode component is the inner end surface of the pole body, the conductive member includes a second connecting segment, the second connecting segment is laid on the inner end surface of the pole body and connected to the inner end surface of the pole body, the conductive member is bent at the connection position between the first connecting segment and the second connecting segment, so that the first connecting segment is located on the side of the second connecting segment away from the pole body, and one of the clamping portions is supported on the side of the end of the pole ear away from the pole body.

[0057] In the above technical solution, the redundancy of the pole ear portion can be improved by the clamping portion supporting the pole ear portion, and the risk of short circuit caused by the pole ear portion being inserted into the active material coating portion can be reduced. In addition, the bent conductive member can play a role of buffer support, reducing the risk of the electrode component hitting the first shell wall, and improving the reliability of the battery cell.

[0058] In some embodiments, the pole ear portion includes a gathered portion formed by stacking and connecting multiple pole ear sheets, the conductive member includes a first connecting segment, the gathered portion is stacked on one side of the first connecting segment in a thickness direction and connected to the first connecting segment.

[0059] In the above technical solution, the first connecting section is in the form of a plate, and the thickness direction of the first connecting section is consistent with that of the gathering portion, and the two are overlapped along the thickness direction of the first connecting section, so that the matching mode between the gathering portion and the conductive part is simple, which is conducive to improving production efficiency.

[0060] In some embodiments, the surface of one end of the pole body facing the electrode component is the inner end surface of the pole body, and the first connecting section is supported on the side of the gathering portion facing away from the pole body, so that the gathering portion is clamped between the inner end surface of the pole body and the first connecting section.

[0061] In the above technical solution, the redundancy of the pole ear portion can be improved by supporting the gathered portion through the first connecting section, and the risk of short circuit caused by the inverted insertion of the pole ear portion into the active material coating portion can be reduced.

[0062] In some embodiments, the pole component includes a pole body, the electrode component includes an active material coating portion accommodated in a receiving cavity, the active material coating portion is connected to the pole body through a conductive portion, the conductive portion is bent to form at least two open grooves, wherein the opening directions of the two open grooves are different and they are adjacent in the direction from the pole body to the active material coating portion.

[0063] In the above technical solution, the conductive part can be in a reciprocating serpentine shape, and the conductive part can play a buffering role. When the battery cell is used in a vibration environment, it can reduce the impact of the active material coating part toward the first shell wall, play a role in protecting the electrode components, and improve the reliability of the battery cell. In addition, since the conductive part does not extend randomly, it can improve the mutual interference and scratching between the pole tabs in the conductive part, and the risk of the pole tabs being inserted into the active material coating part, thereby further improving the reliability of the battery cell.

[0064] In some embodiments, the electrode component includes a pole ear portion connected to the active material coating portion, the pole ear portion constitutes a conductive portion to extend to the pole body and is connected to the pole body, and the pole ear portion is bent alone to form two open grooves with openings facing opposite and adjacent to each other; or, the electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion includes the pole ear portion and a conductive member connected to the pole ear portion, the pole ear portion is connected to the pole body through the conductive member, and the conductive member and the pole ear portion are bent together to form two open grooves with openings facing opposite and adjacent to each other.

[0065] In the above technical solution, the conductive part can be in an S-shape that bends back and forth, thereby shortening the length of the conductive part, simplifying the structure of the conductive part, and facilitating the processing of the conductive part.

[0066] In some embodiments, the shell component also includes a matching shell, the shell body is in a semi-closed cylindrical shape, and the matching shell cover is arranged at the opening; wherein, the matching shell is in a flat plate shape or a semi-closed cylindrical shape.

[0067] In the above technical solution, the shell components have various shapes and can adapt to various application scenarios.

[0068] In some embodiments, the battery cell further includes a pressure relief device, which is disposed on the housing component and is located on the same side or on the opposite side as the pole component.

[0069] In the above technical solution, when the pressure relief device and the pole component are located on the same side, the design of the shell walls other than the first shell wall can be simplified, and the structure and processing of the battery cell can be simplified. When the pressure relief device and the pole component are located on different sides, there is no need to consider the space occupied by the pressure relief device on the first shell wall, and the volume of the pole component can be reduced, so that the shape and volume of the pole component can be flexibly designed according to needs.

[0070] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell of any of the above-mentioned solutions.

[0071] In the above technical solution, since the reliability of the battery cell according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery.

[0072] In some embodiments, the battery includes a box body, a plurality of battery cells are accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole component is arranged on the side of the shell component facing the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

[0073] In the above technical solution, when the pole component of the battery cell is arranged on the side of the shell component facing the bottom plate of the box body, the battery cell is in an inverted state, and the depressurized product is sprayed in the direction away from the passenger compartment, which is safer; when the pole component of the battery cell is arranged on the side of the shell component close to the bottom plate of the box body, the battery cell is in an upright state, and the electrolyte is not easy to leak; therefore, the flexible setting of the orientation of the battery cell and the box body can be achieved.

[0074] In a third aspect, an embodiment of the present application further provides an electrical device, comprising a battery according to any of the above solutions.

[0075] In the above technical solution, since the performance of the battery is improved, it is beneficial to improve the working power performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0077] Figure 1A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0078] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0079] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0080] Figure 4 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0081] Figure 5 for Figure 4 A partial enlarged view of

[0082] Figure 6 A top view of a battery cell provided for some embodiments of the present application;

[0083] Figure 7 For along Figure 6 Sectional view along line AA;

[0084] Figure 8 A schematic diagram of a pole component provided for some embodiments of the present application;

[0085] Fig. 9 for Figure 8 A top view of the pole component shown in ;

[0086] Fig.10 For along Fig. 9 The view from direction B shown in FIG.

[0087] Fig.11 For along Fig. 9 Sectional view of the mid-CC line;

[0088] Fig.12 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0089] Fig.13 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0090] Fig.14 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0091] Fig.15 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0092] Fig.16 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0093] Fig.17A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0094] Fig.18 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, in which the pole component is in a state before being covered by the first shell wall;

[0095] Fig.19 for Fig.18 The state diagram of the pole component covered after the first shell wall is shown in FIG.

[0096] Fig. 20 An exploded view of a battery cell provided in some embodiments of the present application;

[0097] Fig.21 A partial cross-sectional view of a battery cell provided in some embodiments of the present application, in which the pole component is in a state before being covered by the first shell wall;

[0098] Fig. 22 for Fig.21 The state diagram of the pole component covered after the first shell wall is shown in FIG.

[0099] Figure 23A-23D An exploded view of the processing of a battery cell provided by one embodiment of the present application;

[0100] Figure 24A-24B An exploded view of the processing of a battery cell provided by one embodiment of the present application;

[0101] Figure 25A-Figure 25C An exploded view of the processing process of an electrode component provided by one embodiment of the present application;

[0102] Figure 26A-26D An exploded view of the processing of a battery cell provided by one embodiment of the present application;

[0103] Figure 27A-27C An exploded view of the processing of a battery cell provided by one embodiment of the present application;

[0104] Figure 28A-Figure 28D An exploded view of the processing of a battery cell provided by one embodiment of the present application;

[0105] Figure 29A-Figure 29D An exploded view of the processing of a battery cell provided by one embodiment of the present application;

[0106] Figures 30A-30D An exploded view of the processing of a battery cell provided by one embodiment of the present application;

[0107] Figure 31A-Figure 31E An exploded view of the processing of a battery cell provided in accordance with an embodiment of the present application.

[0108] Reference numerals:

[0109] Vehicles 1000;

[0110] Battery 100; Controller 200; Motor 300;

[0111] Box body 101; first box part 1011; second box part 1012;

[0112] Battery cell 102; first direction F1; second direction F2; third direction F3;

[0113] Fifth direction F5;

[0114] Shell component 1; shell body 11; first shell wall 111;

[0115] First sink 1111; overlapping portion 1112;

[0116] Mounting hole 112; opening 113; second shell wall 114;

[0117] Shell cover 12; accommodating chamber 13; sealing ring 14;

[0118] Pole component 2;

[0119] Pole body 21; inner end surface 211; outer end surface 213;

[0120] The penetration portion 214; the riveting portion 2141;

[0121] Inner limiting portion 215; outer limiting portion 216;

[0122] First pole piece 21a; second pole piece 21b; matching hole 21b1;

[0123] Transfer structure 22;

[0124] The inner end surface 220 of the transition structure; the surrounding area 2201;

[0125] flange portion 22a; second sinking groove 22b;

[0126] First adapter ring 221; second adapter ring 222; stop ring portion 2221

[0127] A first insulating frame 224;

[0128] A third adapter ring 223; an inner extension portion 2231; an outer extension portion 2232;

[0129] The second insulating frame 225

[0130] Fourth adapter ring 227; matching ring portion 2271;

[0131] A third insulating frame 228;

[0132] Insulation structure 23;

[0133] Sealing structure 231; Shaft side portion 231a;

[0134] A first insulating member 232; a second insulating member 234;

[0135] Insulating sealing member 24;

[0136] Electrode component 3; electrode assembly 31; pole tab 311;

[0137] Lamination portion 312; Gathering portion 313;

[0138] Active material coating portion 32;

[0139] Pole ear portion 33; Pole ear end portion 331;

[0140] Axial section 34 of the electrode component;

[0141] Conductive portion 4; conductive member 41; open slot 42;

[0142] First connecting section 411; clamping portion 4110; second connecting section 412;

[0143] A first conductive segment 415; a second conductive segment 416; a third conductive segment 417;

[0144] Receiving tank 5; pressure relief device 6. DETAILED DESCRIPTION

[0145] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0146] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0147] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0148] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0149] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0150] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0151] The term "plurality" used in the present application refers to more than two, including two.

[0152] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery or a solid-state battery, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, rectangular or in other shapes, etc., and the embodiments of the present application do not limit this.

[0153] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery may include a box for encapsulating one or more battery cells, or one or more battery modules, and the box may prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0154] The battery cell includes a shell component, an electrode component and an electrolyte (in a solid-state battery, it can be a solid electrolyte layer located between the positive and negative electrodes). The electrode component includes at least one electrode assembly. The electrode assembly and the electrolyte are both contained in the shell component. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator (this structure can be omitted in a solid-state battery). The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.

[0155] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab sheet. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0156] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. The material of the isolation film may be PP, polypropylene or PE, polyethylene, etc. The electrode assembly mentioned in the embodiment of the present application is a winding or laminated structure.

[0157] In the related art, the shell of a battery cell includes a shell body and a shell cover, the electrode assembly is loaded into the shell body through the opening of the shell body, the shell cover is arranged at the opening of the shell body and welded to the shell body, and a pole is arranged on the shell body. In the battery, multiple battery cells are connected by a busbar, which is located outside the shell and connected to the pole. When the battery vibrates or deforms, the poles connected by the busbar will be pulled against each other. Since the poles are arranged on the shell cover, the force acting on the poles will be preferentially transmitted to the welding place between the shell cover and the shell body, causing cracking at the connection between the shell body and the shell cover.

[0158] In view of this, the embodiment of the present application arranges the pole component on the end wall of the shell body opposite to the opening. When the battery vibrates or deforms, the pole component connected by the current collecting component will be pulled. Since the pole component is arranged on the end wall of the shell body opposite to the opening, the force applied to the pole component will be preferentially transmitted to the shell body as an integral part, and will not directly act on the structure matched with the shell body, such as the shell cover, so that not only can the distance of the force applied to the connection between the shell body and the shell cover be extended, but also the shell body will preferentially deform when subjected to force to reduce the force applied to the connection between the shell body and the shell cover, thereby effectively reducing the probability of cracking at the connection between the shell body and the shell cover during the use of the battery, and improving the reliability of the battery cell. In addition, the shell body is an integral part, which is not easy to crack due to stress concentration during pulling and vibration, so there is no need to increase the wall thickness of the wall body in order to increase the connection reliability of each wall body, which is conducive to reducing weight and material costs, and is also conducive to miniaturization of battery cells, or improving the energy density of battery cells.

[0159] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries including battery cells, and electrical devices using batteries.

[0160] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0161] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0162] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery 100, and the battery 100 can be provided at a position such as 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 be used as an operating power source for the vehicle 1000.

[0163] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0164] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0165] Please refer to Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of the present application includes a battery cell 102 and a box 101 for accommodating the battery cell 102. The box 101 can be in various structural forms.

[0166] In some embodiments, the box body 101 may include a first box portion 1011 and a second box portion 1012, the first box portion 1011 and the second box portion 1012 cover each other, and the first box portion 1011 and the second box portion 1012 jointly define a storage space for accommodating the battery cell 102. A sealing member may also be provided at the connection position between the first box portion 1011 and the second box portion 1012 to achieve a sealed connection between the first box portion 1011 and the second box portion 1012. For example, referring to Figure 2 , the first box part 1011 and the second box part 1012 can both be hollow structures with one side open, and the open side of the first box part 1011 covers the open side of the second box part 1012, thereby forming a box body 101 with a storage space. For another example, the second box part 1012 can be a hollow structure with one side open, and the first box part 1011 is in the form of a cover and can cover the open side of the second box part 1012. The box body 101 can be in various shapes, such as a cylindrical box body, a rectangular box body, etc.

[0167] In the battery 100, there may be one or more battery cells 102. If there are more than one battery cell 102, the battery cells 102 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 102 are connected in series and in parallel. The battery cells 102 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the battery cells 102 may be accommodated in the box 101; of course, the battery cells 102 may be connected in series, in parallel, or in a mixed connection to form a battery module, and then the battery modules may be connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 101. In some embodiments, the battery cells 102 may be electrically connected through a busbar component to achieve parallel, series, or mixed connection of the battery cells 102.

[0168] Please refer to Figure 3 , Figure 3 The schematic diagram of the structure of the battery cell 102 provided in some embodiments of the present application. The battery cell 102 is in the form of a rectangular parallelepiped, the height direction of the battery cell 102 is the first direction F1, the thickness direction of the battery cell 102 is the second direction F2, the width direction of the battery cell 102 is the third direction F3, and the first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other.

[0169] Please refer to Figure 4-Figure 7 , Figure 4 A cross-sectional view of a battery cell 102 provided in some embodiments of the present application, Figure 5 for Figure 4 A partial enlarged view of Figure 6 A top view of a battery cell 102 provided in some embodiments of the present application, Figure 7 For along Figure 6 Section view along line AA.

[0170] Combination Figure 4 The battery cell 102 may include a housing component 1 , a pole component 2 and an electrode component 3 .

[0171] Combination Figure 4 and Figure 5 , the pole component 2 is installed on the shell component 1. Exemplarily, the shell component 1 has a accommodating cavity 13, and the shell component 1 includes a first shell wall 111, the first shell wall 111 participates in forming the accommodating cavity 13, and the first shell wall 111 has a mounting hole 112, and the pole component 2 is installed on the first shell wall 111, and is arranged at the mounting hole 112. Among them, "the pole component 2 is installed on the first shell wall 111" means that there is an assembly connection relationship between the pole component 2 and the first shell wall 111, for example, welding or riveting. Therefore, the shell component 1 and the pole component 2 are separate components, and the two are assembled and connected, so that the shell component 1 can be processed separately, and the pole component 2 can be processed separately, so that the processing of the two is convenient, and it is conducive to the processing and manufacturing of the battery cell 102.

[0172] Combination Figure 4 and Figure 5 , the electrode component 3 is accommodated in the shell component 1. Exemplarily, the electrode component 3 includes: an active material coating portion 32 and a pole ear portion 33, the active material coating portion 32 is accommodated in the accommodating cavity 13, and the pole ear portion 33 is connected to the active material coating portion 32. The electrode component 3 includes one or more electrode assemblies 31, and the portion of the current collector coated with the active material layer in the electrode assembly 31 constitutes the active material coating portion 32, and the portion not coated with the active material layer constitutes the pole ear portion 33, and the pole ear portion 33 includes a multilayer pole ear sheet 311.

[0173] Combination Figure 5 and Figure 7, the electrode component 3 is connected to the pole component 2. The electrode component 3 is connected to the pole component 2 through the conductive part 4. The pole component 2 includes a pole body 21, and the active material coating part 32 is connected to the pole body 21 through the conductive part 4 to form electrical conduction. Exemplarily, the battery 100 includes a busbar component located outside the battery cell 102, and the pole body 21 is connected to the busbar component to form electrical conduction, so that a plurality of battery cells 102 can be connected through the busbar component.

[0174] Exemplarily, when the pole component 2 is a negative pole, the pole body 21 can be a copper-aluminum composite part, wherein the copper-aluminum composite part can include an aluminum part and a copper part, the aluminum part is arranged on the side of the copper part away from the active material coating part 32, and is easy to form a reliable connection with the aluminum runner component, and the copper part is easy to connect with the copper foil material of the negative pole lug; and when the pole component 2 is a positive pole, the pole body 21 can be an aluminum part, the aluminum part is easy to form a reliable connection with the aluminum runner component, and the aluminum part is also easy to connect with the aluminum foil material of the positive pole lug.

[0175] The connection method between the conductive part 4 and the pole component 2 is not limited, for example, it may include, but not limited to, ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure fusion welding, brazing, gluing, etc.

[0176] For example, refer to Figure 5 The conductive part 4 may include a pole ear part 33 and a conductive member 41 connected to the pole ear part 33, and the pole ear part 33 is indirectly connected to the pole body 21 through the conductive member 41. The conductive member 41 may be a part of the electrode component 3, or the conductive member 41 may be a part of the pole component 2, or the conductive member 41 may be independent of the electrode component 3 and the pole component 2.

[0177] Therefore, by indirectly connecting the pole ear portion 33 and the pole body 21 through the conductive member 41, the length of the pole ear portion 33 can be shortened, and the problems of wrinkling, bending and breaking of the pole ear piece 311 can be improved. Moreover, by flexibly designing the shape and material of the conductive member 41, the difficulty of connection with the pole body 21 can be reduced, and the convenience of connection between the conductive member 41 and the pole body 21 can be improved.

[0178] For example, refer to Figure 7 The conductive part 4 includes the pole ear part 33, and is connected to the pole body 21 through the pole ear part 33, that is, the conductive member 41 is not required, and the pole ear part 33 can be directly connected to the pole body 21. Therefore, the use of the conductive member 41 can be omitted, and the connection process of the conductive member 41 and the pole ear part 33 can be omitted.

[0179] An insulating material piece is disposed between the pole body 21 and the first shell wall 111 to achieve insulation between the first shell wall 111 and the pole body 21, thereby preventing the first shell wall 111 from being charged. For example, the insulating material piece may be a part of the pole component 2 (e.g., the insulating structure 23), or, for another example, the insulating material piece may be disposed between the pole component 2 and the shell component 1.

[0180] In some embodiments of the present application, the shell component 1 includes a shell body 11 that forms a receiving cavity 13 , one end of the shell body 11 has an opening 113 , and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111 .

[0181] The shell body 11 is an integral piece, that is, the shell body 11 is an integrally molded piece, 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 facing away from the first shell wall 111 defines an opening 113, and a cavity is defined between the first shell wall 111 and the second shell wall 114, and the cavity constitutes at least a part of the accommodating cavity 13.

[0182] When the shell component 1 includes a shell body 11 with an opening 113 at one end, the shell component 1 also includes a matching shell, which matches the shell body 11 to cover the opening 113 and together with the shell body 11, encloses the accommodating cavity 13. For example, the shell body 11 is semi-closed cylindrical, and the matching shell is flat, that is, the matching shell can be a shell cover 12. In this case, the shell component 1 can be a combination of the shell body 11 and the shell cover 12. For another example, the shell body 11 is semi-closed cylindrical, and the matching shell is also semi-closed cylindrical. In this case, the shell component 1 can be a combination of two semi-closed cylindrical openings. As a result, the shell component has various forms and can adapt to a variety of application scenarios.

[0183] In the above technical solution, the electrode component housed in the shell component 1 needs to be connected to the pole component 2 installed on the first shell wall 111. Therefore, when the battery 100 vibrates or deforms, the pole component 2 connected through the busbar component will be pulled. Since the pole component 2 is arranged on the end wall of the shell body 11 opposite to the opening 113, the force applied to the pole component 2 will be preferentially transmitted to the shell body 11 as an integral part, and will not directly act on the matching shell that matches the shell body, such as the shell cover 12, so that not only can the distance for the force to be transmitted to the connection between the shell body 11 and the shell cover 12 be extended, but also the shell body 11 will preferentially deform when subjected to force, so as to reduce the force applied to the connection between the shell body 11 and the shell cover 12, thereby effectively reducing the probability of cracking at the connection between the shell body 11 and the shell cover 12 during the use of the battery 100, and improving the reliability of the battery cell 102. Furthermore, the shell body 11 is an integral piece and is not prone to cracking due to stress concentration during pulling and vibration, so there is no need to increase the wall thickness to increase the connection reliability of each wall, which is beneficial to reducing weight and material costs, and is also beneficial to miniaturizing the battery cell 102 or improving the energy density of the battery cell 102.

[0184] Exemplarily, when the end wall of the shell body 11 opposite to the opening 113 is used as the first shell wall 111 for mounting the pole component 2, if the pole component 2 is first mounted at the mounting hole 112 of the first shell wall 111, and then the electrode component 3 is installed in the shell body 11, it is difficult to connect the electrode component 3 with the pole component 2. In some embodiments of the present application, the electrode component 3 and the pole component 2 can be connected first, and then the pole component 2 can be assembled and connected to the shell component 1, so that the connection requirements of the electrode component 3 and the pole component 2 can be met, and the connection requirements of the pole component 2 and the shell component 1 can also be met, thereby improving the reliability and processability of the battery cell 102.

[0185] Moreover, this processing sequence can effectively shorten the length of the conductive part 4. For example, as long as the electrode component 3 and the pole component 2 are connected first, and the pole component 2 and the shell component 1 are connected later, the material and cost of the conductive part 4 can be saved, the redundancy of the conductive part 4 can be reduced, the risk of short circuit can be reduced, and the space occupied by the conductive part 4 in the shell component 1 can be reduced, which is beneficial to improving the energy density of the battery cell 102.

[0186] The material of the housing component 1 is not limited, for example, including but not limited to aluminum shell, steel shell, aluminum-plastic film, plastic or other materials resistant to electrolyte corrosion.

[0187] Please refer to Figure 8-Figure 11 , Figure 8 A schematic diagram of a pole component provided for some embodiments of the present application; Fig. 9 for Figure 8 A top view of the pole component shown in ; Fig.10 For along Fig. 9 The view from direction B shown in FIG. Fig.11 For along Fig. 9 Cross-sectional view along the CC line; in some embodiments of the present application, the pole component 2 includes a pole body 21, a transition structure 22 and an insulating structure 23, the transition structure 22 surrounds the pole body 21, and the transition structure 22 is connected to the first shell wall 111, the insulating structure 23 is insulated and fitted between the transition structure 22 and the pole body 21, and the electrode component 3 is connected to the pole body 21.

[0188] The adapter structure 22 surrounds the entire circumference of the pole body 21 along the circumference of the mounting hole 112, so that the adapter structure 22 can play a role in connecting the pole body 21 and the first shell wall 111 in the outer peripheral area of ​​the pole body 21, and the insulating structure 23 insulates the matching position of the adapter structure 22 and the pole body 21 to prevent the pole body 21 and the adapter structure 22 from being electrically short-circuited. Among them, the connection method of the adapter structure 22 and the first shell wall 111 is not limited, for example, it can be welding, riveting, punching, bonding, etc. In addition, the pole body 21 is connected to the electrode component 3, and the electrode component 3 can be connected to the pole body 21 through the conductive part 4, and the connection method of the conductive part 4 and the pole body 21 is not limited, for example, it can be welding, riveting, punching, bonding, etc.

[0189] In the above technical solution, the structure of the pole component 2 is simple and easy to process. Since it includes the pole body 21 and the adapter structure 22, the shape and size of the pole body 21 and the adapter structure 22 can be designed separately based on different design points. For example, a runway-shaped adapter structure 22 can be used to match the circular pole body 21, or a runway-shaped adapter structure 22 can be used to match the runway-shaped pole body 21, so as to flexibly adapt to the connection requirements of different forms of shell components 1 and electrode components 3, and increase the application range of the pole component 2. "Runway shape" is an oblong circle, in which the oblong circle can be roughly considered to be composed of a rectangle and two semicircles, and the outline shape of the oblong circle can be roughly considered to be the outline shape of the rectangle after the two short sides of the rectangle are replaced by two arcs.

[0190] Exemplarily, the adapter structure 22 can be set to match the shape of the mounting hole 112, and the shape of the mounting hole 112 can be designed to be a long strip that is convenient for the pole component 2 to pass through and makes the flipping angle of the pole component 2 smaller. At the same time, the pole body 21 can be designed to be a long strip that matches the shape of the adapter structure 22, so that the pole body 21 has a larger area to connect with the conductive part 4, or the pole body 21 can be designed to be a circle that does not match the shape of the adapter structure 22, so as to help reduce the connection area between the pole body 21 and the adapter structure 22, improve the force uniformity at the connection between the pole body 21 and the adapter structure 22, and thus improve the connection reliability between the pole body 21 and the adapter structure 22.

[0191] Please refer to Figure 6 In some embodiments of the present application, the adapter structure 22 is formed into a long strip (e.g., a rectangle, an ellipse, a racetrack, etc.) extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22 (e.g., a rectangle, an ellipse, a racetrack, etc.). As mentioned above, the electrode component 3 is connected to the pole component 2 through the conductive portion 4. When the contour shape of the pole body 21 is formed into a long strip that matches the contour shape of the adapter structure 22, the area of ​​the pole body 21 is larger, which is conducive to increasing the connection area between the conductive portion 4 and the pole body 21, thereby improving the charging performance.

[0192] Please refer to Figure 8 In some other embodiments of the present application, the adapter structure 22 is formed into a long strip (such as a rectangle, an ellipse, a racetrack, etc.) extending along the length direction of the first shell wall 111, and the pole body 21 is arranged at the length center position of the adapter structure 22 and is circular. Therefore, when the pole body 21 is arranged at the length center position of the long strip adapter structure 22 and is circular, it is beneficial to reduce the connection area between the pole body 21 and the adapter structure 22, and the connection force between the pole body 21 and the adapter structure 22 can be evenly distributed on the circumference, thereby improving the force uniformity at the connection between the pole body 21 and the adapter structure 22, thereby improving the connection reliability between the pole body 21 and the adapter structure 22.

[0193] Please refer to Figure 8-Figure 11 In some embodiments of the present application, the insulating structure 23 is also sealed and matched between the adapter structure 22 and the pole body 21. Since the shell component needs to have a sealing requirement to prevent the electrolyte from leaking to the outside of the shell component. Therefore, in some embodiments of the present application, the insulating structure 23 is set to not only insulate the adapter structure 22 from the pole body 21, but also to make the matching position of the adapter structure 22 and the pole body 21 present a sealed state, so as to isolate the inside and outside of the shell component 1 after the adapter structure 22 is connected to the first shell wall 111, reduce the risk of the electrolyte in the shell component 1 leaking from the matching position of the adapter structure 22 and the pole body 21 to the outside of the shell component 1, and reduce the risk of liquid or dust outside the shell component 1 entering the shell component 1 from the matching position of the adapter structure 22 and the pole body 21, thereby improving the reliability of the battery cell 102.

[0194] If the pole body needs to be pressed on the seal placed on the first shell wall to achieve the seal between the first shell wall and the pole component through the seal, the pressure applied by the pole component to the first shell wall is likely to be large, and in the case of a thin shell body wall thickness, it is easy to cause the risk of deformation or damage to the first shell wall. In the above technical solution, by sealing the insulating structure 23 between the adapter structure 22 and the pole body 21, when the battery cell 102 is sealed, it is only necessary to connect the adapter structure 22 to the first shell wall 111, and there is no need to apply a large pressure to the first shell wall 111, so that the force on the first shell wall 111 can be reduced, which plays a role in protecting the shell component 1, thereby helping to reduce the wall thickness of the shell component 1 and reduce material costs. Moreover, since the first shell wall 111 is the end of the shell body 11 opposite to the opening 113, the force at the connection between the first shell wall 111 and the second shell wall 114 can be reduced, and the force on the second shell wall 114 can be reduced, thereby helping to ensure the reliability of the shell body 11 and reduce the wall thickness and cost of the shell body 11.

[0195] Please refer again Figure 8-Figure 11 In some embodiments of the present application, the insulating structure 23 includes a sealing structure 231. In the embodiments of the present application, the sealing structure 231 is made of a material having both sealing and insulating properties, such as an elastic rubber member.

[0196] Please refer again Figure 8-Figure 11 Exemplarily, at least a portion of the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 in the inner and outer directions (eg, the fifth direction F5 ) of the first shell wall 111 .

[0197] In the embodiment of the present application, the direction from the inner side of the first shell wall 111 to the outer side of the first shell wall 111, and the direction from the outer side of the first shell wall 111 to the inner side of the first shell wall 111 are collectively referred to as “inside-outside directions of the first shell wall 111 (e.g., the fifth direction F5)”. “Inside of the first shell wall 111” refers to the side of the first shell wall 111 facing the electrode component 3, and “outside of the first shell wall 111” refers to the side of the first shell wall 111 facing away from the electrode component 3.

[0198] The sealing structure 231 at least includes a shaft side portion 231a, the side of the shaft side portion 231a facing the accommodating cavity 13 is the inner side of the shaft side portion 231a, and the side of the shaft side portion 231a away from the electrode component 3 is the outer side of the shaft side portion 231a, and one of the transition structure 22 and the pole body 21 is partially clamped on the outer side of the shaft side portion 231a, and the other part is clamped on the inner side of the shaft side portion 231a, so that the shaft side portion 231a is clamped between the transition structure 22 and the pole body 21 in the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) to achieve axial sealing between the transition structure 22 and the pole body 21.

[0199] Thus, by setting at least part of the sealing structure 231 to be clamped between the transition structure 22 and the pole body 21 in the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111, an axial seal between the transition structure 22 and the pole body 21 is achieved, and the axial seal can achieve a more reliable sealing effect, thereby improving the leakage problem at the matching position of the transition structure 22 and the pole body 21. Moreover, the embodiment of the present application can reduce the axial force on the first shell wall 111 by integrating the axial seal (e.g., the shaft side portion 231a) into the pole component.

[0200] Please refer again Figure 8-Figure 11 Exemplarily, the sealing structure 231 is arranged around the peripheral side of the adapter structure 22 facing the pole body 21 (i.e., the inner ring of the adapter structure 22). In the embodiment of the present application, since the adapter structure 22 is arranged around the pole body 21 and connected to the first shell wall 111, the peripheral side of the adapter structure 22 facing the pole body 21 is the "inner ring 2211 of the adapter structure 22", and the peripheral side of the adapter structure 22 facing the first shell wall 111 is the "outer ring 2212 of the adapter structure 22". In the above technical solution, by arranging the sealing structure 231 around the inner ring of the adapter structure 22, the sealing structure 231 can be close to the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily realizing compression sealing thereof, and the seal is not easy to fail, thereby improving the sealing effect.

[0201] In addition, when the insulating structure 23 includes a sealing structure 231, the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 so that the transition structure 22 and the pole body 21 are sealed and matched, and the transition structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is arranged at the length center position of the transition structure 22 and is circular, since the connection position of the transition structure 22 and the pole body 21 is subjected to uniform force, it is easy to control the compression amount of the sealing structure 231 to improve the reliability of the sealing cooperation between the transition structure 22 and the pole body 21, and the sealing area is relatively small and not easy to fail.

[0202] Please refer again Figure 8-Figure 11 In some embodiments of the present application, the pole body 21 includes a peripheral portion 212, and the transition structure 22 is clamped on both sides of the peripheral portion 212 in the inner and outer directions of the first shell wall 111 through the insulating structure 23, and at least a portion of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the electrode component 3 and the transition structure 22.

[0203] In this embodiment, the peripheral portion 212 can be the outer peripheral structure of the pole body 21 . Since the sealing structure 231 is arranged around the peripheral side of the transition structure 22 facing the pole body 21 , the sealing structure 231 can be clamped between the peripheral portion 212 and the transition structure 22 .

[0204] In this embodiment, the side of the peripheral portion 212 facing away from the electrode component 3 is the outer side of the peripheral portion 212, and the side of the peripheral portion 212 facing the accommodating cavity 13 is the inner side of the peripheral portion 212. The transition structure 22 is limited to the outer side of the peripheral portion 212 by the insulating structure 23 to limit the movement of the pole body 21 relative to the transition structure 22 in the direction away from the electrode component 3. The transition structure 22 is also limited to the inner side of the peripheral portion 212 by the insulating structure 23 to limit the movement of the pole body 21 relative to the transition structure 22 toward the accommodating cavity 13, thereby achieving the transition structure 22 being clamped on both sides of the peripheral portion 212 in the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the insulating structure 23.

[0205] In the above technical solution, the structure of the pole part 2 is simple and easy to process, and the relative fixation and insulation matching between the pole body 21 and the adapter structure 22 can be simply and effectively achieved. The peripheral portion 212 of the pole body 21 and the adapter structure 22 are used to clamp the sealing structure 231, so that the sealing structure 231 can be in the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily achieving compression sealing on it, and the seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the electrode part 3 and the adapter structure 22, the sealing structure 231 can be sealed from the side of the peripheral portion 212 facing the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking out of the matching position between the pole body 21 and the adapter structure 22, thereby improving the sealing effect.

[0206] Please refer again Fig.11 , illustratively, the insulating structure 23 further includes a first insulating member 232, and the transition structure 22 is clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 through the first insulating member 232 and the sealing structure 231. In this embodiment, the transition structure 22 is not limited in composition, and can be a single part or a combination of multiple parts (e.g., two or more).

[0207] Since at least a portion of the sealing structure 231 (such as the axial side portion 231a) is arranged on the side of the peripheral portion 212 facing the electrode component 3, at least a portion of the first insulating member 232 is arranged on the side of the peripheral portion 212 away from the electrode component 3, and the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5) through the first insulating member 232 and the sealing structure 231 respectively.

[0208] In the above technical solution, since the insulating structure 23 includes the first insulating member 232 and the sealing structure member 231 which are not integrated into one piece, the design and processing of the insulating structure 23 can be simplified. Moreover, according to the specific matching requirements with the pole body 21 and the adapter structure 22, the first insulating member 232 can be set as an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the first insulating member 232 can be set as a compressible sealing member that has a sealing effect (such as an elastic rubber member), so as to meet different actual requirements. In addition, when the first insulating member 232 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure member 231 and improve the sealing effect.

[0209] Alternatively, in some other embodiments of the present application, the sealing structure 231 can also be an integral structure and outsource the peripheral portion 212, so as to be respectively located on the side of the peripheral portion 212 facing the electrode component 3 and the side 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 sealing structure 231. That is, the sealing structure 231 is an integral annular structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a respectively located on the inner and outer sides of the peripheral portion 212, so that the transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure and outsources the peripheral portion 212, it is possible to reduce parts and assembly processes.

[0210] Please refer again Figure 8-Figure 11 In some embodiments of the present application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is arranged on the side of the first adapter ring 221 away from the electrode component 3. The second adapter ring 222 is connected to the first adapter ring 221, and the first adapter ring 221 is connected to the first shell wall 111. The sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232.

[0211] For example, the first adapter ring 221 and the second adapter ring 222 can be connected by welding, riveting, punching, or bonding. For example, the outer ring of the first adapter ring 221 is connected to the first shell wall 111 by welding, riveting, punching, or bonding. Exemplarily, the first adapter ring 221 and the second adapter ring 222 are both made of aluminum and welded, and the first adapter ring 221 and the first shell wall 111 are both made of aluminum and welded, which is conducive to improving the welding yield.

[0212] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 which are arranged inside and outside and assembled and connected, so as to facilitate the assembly connection between the adapter structure 22 and the insulating structure 23 and the pole body 21, so that the pole component 2 is easy to process and manufacture, and it is easy to control the compression amount of the sealing structure 231, thereby improving the sealing reliability.

[0213] The second adapter ring 222 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232 in any manner. Figure 8-Figure 11 The first insulating member 232 and the second adapter ring 222 and the peripheral portion 212 can be connected by injection molding. Fig.12 , Fig.12 A cross-sectional view of a pole component provided for some embodiments of the present application; the second adapter ring 222 may include a stop ring portion 2221, and at least a portion of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 along the inner and outer directions of the first shell wall 111 (for example, the fifth direction F5), wherein the material of the first insulating member 232 is not limited, for example, it may be a plastic member or an elastic rubber member.

[0214] Please refer again Fig.11 , exemplarily, the adapter structure 22 further includes a first insulating frame 224, and the first insulating frame 224 is connected to the side of the first adapter ring 221 facing the electrode component 3. Therefore, the first insulating frame 224 can be used to insulate between the electrode component 3 and the first adapter ring 221, reducing the difficulty of setting the insulation structure here. Exemplarily, the first insulating frame 224 has a plug, and the first adapter ring 221 has a socket, and the plug is inserted into the socket by interference fit to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0215] Please refer to Fig.13 , Fig.13 A cross-sectional view of a pole component provided in some embodiments of the present application; in some embodiments of the present application, the adapter structure 22 includes a third adapter ring 223, and the third adapter ring 223 includes an integrally arranged inner extension portion 2231 and an outer extension portion 2232. That is, the inner extension portion 2231 and the outer extension portion 2232 are different parts of an integral piece, rather than two separate parts assembled and connected.

[0216] The end of the inner extension 2231 facing the pole body 21 (i.e., the inner ring of the inner extension 2231) and the end of the outer extension 2232 facing the pole body 21 (i.e., the inner ring of the outer extension 2232) are spaced in the inner-outer direction, so as to be clamped on both sides of the peripheral portion 212 along the inner-outer direction (e.g., the fifth direction F5) of the first shell wall 111 by the insulating structure 23. The sealing structure 231 is clamped between the inner extension 2231 and the peripheral portion 212, and the outer extension 2232 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232.

[0217] The third adapter ring 223 and the first shell wall 111 may be connected in any manner, such as welding, riveting, punching, bonding, etc. For example, the third adapter ring 223 and the first shell wall 111 are both made of aluminum and welded, which is beneficial to improving welding yield.

[0218] The outer extension portion 2232 is insulated and fixedly matched with the peripheral portion 212 by the first insulating member 232 in any manner. Fig.13 The outer extension 2232 rivets the first insulating member 232 against the peripheral portion 212, wherein the material of the first insulating member 232 is not limited, for example, it can be a plastic member or an elastic rubber member. For another example, please refer to Fig.14 , Fig.14 A cross-sectional view of a pole component provided in some embodiments of the present application; the first insulating member 232 and the pole body 21 , as well as the first insulating member 232 and the outer extension portion 2232 are respectively connected by injection molding, and the inner extension portion 2231 rivets the sealing structure 231 against the peripheral portion 212 .

[0219] For example, please refer again to Fig.14 The adapter structure 22 further includes a second insulating frame 225, which is connected to the side of the third adapter ring 223 facing the electrode component 3. Therefore, the second insulating frame 225 can be used to insulate between the electrode component 3 and the third adapter ring 223, eliminating the need to provide an insulating structure. Exemplarily, the second insulating frame 225 has a plug, and the third adapter ring 223 has a socket, and the plug is inserted into the socket by interference fit to achieve the connection between the second insulating frame 225 and the third adapter ring 223.

[0220] Please refer to Fig.15 and Fig.16 , Fig.15 A cross-sectional view of a battery cell provided for some embodiments of the present application; Fig.16A cross-sectional view of a battery cell provided in some embodiments of the present application. In some embodiments of the present application, the adapter structure 22 includes a matching ring portion 2271, the pole body 21 includes a penetration portion 214 penetrated through the matching ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetration portion 214 and clamped on both inner and outer sides of the matching ring portion 2271, and at least a portion of the sealing structure 231 is clamped between the matching ring portion 2271 and the inner limiting portion 215.

[0221] Exemplarily, the adapter structure 22 includes a fourth adapter ring 227, the fourth adapter ring 227 includes a matching ring portion 2271, and the fourth adapter ring 227 is connected to the first shell wall 111, for example, the outer ring of the fourth adapter ring 227 is connected to the first shell wall 111. The connection method between the fourth adapter ring 227 and the first shell wall 111 is not limited, for example, welding, riveting, punching, bonding, etc. Exemplarily, the fourth adapter ring 227 and the first shell wall 111 are both made of aluminum and are welded, which is conducive to improving the welding yield.

[0222] In the above technical solution, the structure of the pole component 2 is simple and easy to process, and the relative fixation and insulation matching of the pole body 21 and the adapter structure 22 can be simply and effectively achieved. The sealing structure 231 is clamped by the matching position of the pole body 21 and the matching ring part 2271, so that the sealing structure 231 can be in the matching position of the adapter structure 22 and the pole body 21, which is conducive to sealing the matching position of the adapter structure 22 and the pole body 21 in a shorter path, improving the reliability of the seal, and is conducive to reducing the size of the sealing structure 231, reducing the sealing area, and easily achieving compression sealing on it, and the seal is not easy to fail, thereby improving the sealing effect. Moreover, since at least part of the sealing structure 231 is clamped between the matching ring part 2271 and the inner limit part 215, the sealing structure 231 can be sealed from the side of the matching ring part 2271 facing the accommodating cavity 13, which can more effectively inhibit the electrolyte from leaking out of the matching position of the pole body 21 and the adapter structure 22, thereby improving the sealing effect.

[0223] Please refer again Fig.15 The insulating structure 23 may further include a second insulating member 234 , wherein at least a portion of the sealing structure member 231 is clamped between the inner limiting portion 215 and the mating ring portion 2271 , and at least a portion of the second insulating member 234 is clamped between the outer limiting portion 216 and the mating ring portion 2271 .

[0224] In the above technical solution, since the insulating structure 23 includes the second insulating member 234 and the sealing structure 231 which are not integrated into one piece, the design and processing of the insulating structure 23 can be simplified. Moreover, according to the specific matching requirements with the pole body 21 and the adapter structure 22, the second insulating member 234 can be set as an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), or the second insulating member 234 can be set as a compressible sealing member that has a sealing effect (such as an elastic rubber member), so as to meet different actual requirements. In addition, when the second insulating member 234 is an insulating member that is basically incompressible and does not have a sealing effect (such as a plastic member), it is easy to control the compression amount of the sealing structure 231 and improve the sealing effect.

[0225] Alternatively, please combine Fig.16 In some other embodiments of the present application, the sealing structure 231 can also be an integral structure and surround the matching ring 2271, so as to be respectively located on the side of the matching ring 2271 facing the electrode component 3 and the side away from the electrode component 3, and the pole body 21 is clamped on both sides of the matching ring 2271 along the inner and outer directions (for example, the fifth direction F5) of the first shell wall 111 through the sealing structure 231. That is, the sealing structure 231 is an integral annular structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a respectively located on the inner and outer sides of the matching ring 2271. In this way, the transition structure 22 can be clamped on both sides of the matching ring 2271 along the inner and outer directions (for example, the fifth direction F5) of the first shell wall 111 through the two 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 matching ring 2271, the number of parts and the assembly process can be reduced.

[0226] In an embodiment of the present application, when the pole body 21 includes a penetration portion 214, and an inner limiting portion 215 and an outer limiting portion 216 connected to the penetration portion 214 and clamped on both sides of the mating ring portion 2271, the structure of the pole body 21 is not limited, and it can be a single part or a combination of multiple parts (such as two or more).

[0227] For example, please refer again to Fig.15, the outer limiting portion 216 and the penetration portion 214 are assembled and connected on the side of the matching ring portion 2271 away from the inner limiting portion 215. Among them, the method of assembling and connecting the outer limiting portion 216 and the penetration portion 214 is not limited, such as welding, punching, adhesive connection, etc., and the assembly connection refers to the connection of two parts together through a connection process. Therefore, the outer limiting portion 216 and the penetration portion 214 are set as separate parts and assembled and connected, and the structure of the pole body 21 is simple and easy to assemble and connect with the adapter structure 22. In addition, when the outer limiting portion 216 and the penetration portion 214 are welded, the thermal impact on the sealing structure 231 clamped between the inner limiting portion 215 and the matching ring portion 227 can be reduced, and the sealing reliability of the sealing structure 231 can be improved.

[0228] In the above embodiment, the connection method between the penetration portion 214 and the inner limiting portion 215 is not limited, and can be an integral part, or can be a split part and pre-connected together. Exemplarily, the end of the penetration portion 214 that is away from the inner limiting portion 215 can include a riveted portion 2141. During assembly, the penetration portion 214 can be penetrated along the direction from the inner limiting portion 215 to the outer limiting portion 216 through the matching ring portion 2271 with the insulating structure 23, and then the riveted portion 2141 is riveted to limit the penetration portion 214 from coming out along the direction from the outer limiting portion 216 to the inner limiting portion 215. After that, the riveted portion 2141 can be connected to the outer limiting portion 216, so as to facilitate the connection between the penetration portion 214 and the outer limiting portion 216, such as welding. Alternatively, the riveted portion 2141 can be omitted, and the riveting process after the penetration of the penetration portion 214 is omitted.

[0229] For example, please combine again Fig.16 In some other embodiments of the present application, the outer limiting portion 216 and the penetration portion 214 are an integral part, and the outer limiting portion 216 rivets the second insulating member 234 against the matching ring portion 2271. In the above technical solution, the assembly connection of the outer limiting portion 216 with the insulating structure 23 and the transition structure 22 is achieved by riveting, which reduces the thermal impact of the heat generated when the outer limiting portion 216 is connected with the insulating structure 23 and the transition structure 22 on the sealing structure 231, thereby improving the sealing reliability of the sealing structure 231. In addition, by riveting the outer limiting portion 216 to press the second insulating member 234 against the matching ring portion 2271, it is easy to control the compression amount of the sealing structure 231 and achieve a better compression effect.

[0230] In the above embodiment, the connection method of the penetration portion 214 and the inner limiting portion 215 is not limited, and can be an integral piece, or can be a separate piece and pre-connected together. Exemplarily, during assembly, the penetration portion 214 can be penetrated by the matching ring portion 2271 matched with the insulating structure 23 along the direction from the inner limiting portion 215 to the outer limiting portion 216, and then the outer limiting portion 216 is riveted to limit the relative movement of the pole component 21 and the adapter structure 22.

[0231] The pole body 21 is a solid structure or a hollow structure. For example, when the pole body 21 is a hollow structure, please refer to Fig.16 The pole body 21 includes a first pole piece 21a and a second pole piece 21b. The second pole piece 21b is composed of a penetration portion 214, an inner limiting portion 215 and an outer limiting portion 216, and is mounted on the first shell wall 111. The penetration portion 214 surrounds a matching hole 21b1 that penetrates along the inner and outer directions of the first shell wall 111. The first pole piece 21a is assembled on the side of the second pole piece 21b that is away from the electrode component 3 and covers the matching hole 21b1, so as to form a receiving space open toward the direction of the electrode component 3 between the first pole piece 21a and the second pole piece 21b. A part of the conductive part 4 can extend into the receiving space and be connected to the first pole piece 21a, so that the pole body 21 can play the role of accommodating the conductive part 4, so as to reduce the space occupied by the conductive part 4 in the receiving cavity 13, which is conducive to improving the energy density of the battery cell 102.

[0232] Please refer again Fig.15 In some embodiments of the present application, the adapter structure 22 further includes a third insulating frame 228, and the third insulating frame 228 is connected to the side of the fourth adapter ring 227 facing the electrode component 3. Therefore, the third insulating frame 228 can be used to insulate between the electrode component 3 and the fourth adapter ring 227, eliminating the need to set an insulating structure here. Exemplarily, the third insulating frame 228 has a plug, and the fourth adapter ring 227 has a socket, and the plug is inserted into the socket by interference fit to achieve the connection between the third insulating frame 228 and the fourth adapter ring 227.

[0233] Please refer to Fig.17 , Fig.17 A cross-sectional view of a battery cell provided in some embodiments of the present application; in some embodiments of the present application, a mounting hole 112 is provided on the first shell wall 111, a sealing ring 14 is provided around the mounting hole 112, and the sealing ring 14 is clamped between the pole component 2 and the first shell wall 111. Therefore, the pole component 2 has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall 111.

[0234] In some embodiments of the present application, a mounting hole 112 is provided on the first shell wall 111, the pole component 2 covers the mounting hole 112, and the edge of the adapter structure 22 overlaps one side of the first shell wall 111 in the wall thickness direction. In this way, by covering the adapter structure 22 on one side of the first shell wall 111 in the wall thickness direction, that is, the adapter structure 22 is covered on the outer side of the first shell wall 111, or is covered on the inner side of the first shell wall 111, the assembly of the adapter structure 22 and the first shell wall 111 is facilitated.

[0235] Exemplarily, the adapter structure 22 is connected to the first shell wall 111 by welding. For example, after the adapter structure 22 is covered on the first shell wall 111, the adapter structure 22 and the first shell wall 111 can be connected by welding, so as to facilitate processing and better ensure the connection reliability between the adapter structure 22 and the first shell wall 111. For example, welding can be performed from the outside of the first shell wall 111 so that the weld formed by the connection between the two is exposed on the side of the first shell wall 111 away from the electrode component 3 (i.e., the side away from the active material coating portion 32), so as to facilitate welding operation and increase welding space. The present application is not limited to this. For example, in some other embodiments of the present application, the adapter structure 22 can also be set to be penetrated in the mounting hole 112 and riveted to the first shell wall 111.

[0236] Please refer to Fig.18 and Fig.19 , Fig.18 A partial cross-sectional view of a battery cell 102 provided in some embodiments of the present application, in which the pole component 2 is in a state before being covered by the first shell wall 111; Fig.19 for Fig.18 The pole component 2 shown in FIG. 1 is a state diagram after being covered with the first shell wall 111.

[0237] Please refer to Fig.18 and Fig.19In some embodiments, when the electrode component 3 is first connected to the pole component 2 and then the pole component 2 is assembled and connected to the first shell wall 111, after the electrode component 3 is connected to the pole component 2 (for example, the pole component 2 and the electrode component 3 can be connected first, then installed into the shell body 11 together, and then the pole component 2 is extended from the mounting hole 112 to the outside of the first shell wall 111; or for another example, the electrode component 3 is installed into the shell body 11, the conductive part 4 is passed through the mounting hole 112, and connected to the pole component 2 pre-arranged on the outside of the first shell wall 111), the pole component 2 is covered on the mounting hole 112 of the first shell wall 111 from the outside of the first shell wall 111 (that is, the side away from the active material coating part 32). At this time, the edge of the transition structure 22 overlaps the side of the first shell wall 111 away from the electrode component 3. Therefore, since the pole component 2 covers the first shell wall 111 from the outside, it is convenient to assemble and connect the pole component 2 with the first shell wall 111, which is beneficial to improve the connection reliability between the pole component 2 and the first shell wall 111.

[0238] Please refer to Fig.18 and Fig.19 In some embodiments of the present application, when the edge of the adapter structure 22 overlaps the side of the first shell wall 111 away from the electrode component 3, the first shell wall 111 may be provided with a first sinking groove 1111 arranged around the mounting hole 112, the first sinking groove 1111 is open in the direction away from the electrode component 3 (that is, the first sinking groove 1111 is open in the direction away from the active material coating portion 32), and the edge of the adapter structure 22 is embedded in the first sinking groove 1111, wherein the edge of the adapter structure 22 has a flange portion 22a surrounding the adapter structure 22, and the flange portion 22a is embedded in the first sinking groove 1111. Thus, it is convenient to support and position the connection between the adapter structure 22 and the first shell wall 111, which is conducive to the welding connection between the two from the outside of the first shell wall 111 (that is, the side away from the active material coating portion 32).

[0239] Please refer again Fig.18 and Fig.19 For example, the thickness of the flange portion 22a matches the groove depth T1 of the first groove 1111, where "matching" means that the thickness of the flange portion 22a is substantially consistent with the groove depth of the first groove 1111. Thus, it is convenient to weld the flange portion 22a to the first shell wall 111, the thickness of the flange portion 22a is not too large relative to the groove depth of the first groove 1111, and unnecessary space occupation can be reduced, and the thickness of the flange portion 22a is not too small relative to the groove depth of the first groove 1111, and the welding strength requirement can be met.

[0240] For example, please refer to Figure 6 , and combined with Fig.18 and Fig.19, the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 satisfies 10% to 60%, and this range is applicable to both the positive pole component 2 and the negative pole component 2. Further, the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 can also satisfy 25% to 40%, for example, the width W2 of the pole component 2 is about 21 mm, the length L2 of the pole component 2 is about 63 mm, and the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 is about 33%.

[0241] Therefore, by setting the ratio of the width W2 of the pole component 2 to the length L2 of the pole component 2 to meet 10% to 60%, the overall area of ​​the pole component 2 can be relatively large, which is beneficial for the electrical connection area between the pole component 2 and the electrode component 3 to meet relatively large requirements. At the same time, the width of the pole component 2 is relatively small relative to the length. In this way, when connecting the pole component 2 and the electrode component 3, the pole component 2 can be placed with one side edge in the width direction facing the active material coating portion 32. Since the width of the pole component 2 is small, it is beneficial to shorten the distance between the pole component 2 and the active material coating portion 32, thereby shortening the length of the conductive portion 4 and reducing the redundancy of the conductive portion 4.

[0242] For example, please refer to Figure 6 , the pole component 2 can be set to: the ratio of the width W2 of the pole component 2 to the width W1 of the first shell wall 111 is 20% to 90%, and this range is applicable to both the positive pole component 2 and the negative pole component 2. Further, the ratio of the width W2 of the pole component 2 to the width W1 of the first shell wall 111 is 70% to 80%. For example, the width W2 of the pole component 2 is about 21mm, the width W1 of the first shell wall 111 is about 28m, and the ratio of the width W2 of the pole component 2 to the width W1 of the first shell wall 111 is about 75%. Thereby, it is beneficial for the pole component 2 to make full use of the space in the width direction of the first shell wall 111. Exemplarily, the width W1 of the first shell wall 111 is consistent with the size of the battery cell 102 in the width direction of the first shell wall 111, for example Figure 3 The width of the first shell wall 111 shown in FIG. 1 is consistent with the size of the battery cell 102 in the second direction F2 .

[0243] For example, please refer to Figure 6When two pole components 2 are arranged on the first shell wall 111 and are spaced apart along the length direction of the first shell wall 111, the ratio of the length L2 of the pole component 2 to the length L1 of the first shell wall 111 is 25%±15% (i.e., 10% to 40%), and this range is applicable to both the positive pole component 2 and the negative pole component 2. Further, the ratio of the length L2 of the pole component 2 to the length L1 of the first shell wall 111 is 15% to 30%. For example, the length L2 of the pole component 2 is about 63 mm, the length L1 of the first shell wall 111 is about 297 mm, and the ratio of the length L2 of the pole component 2 to the length L1 of the first shell wall 111 is about 21%. Thus, it is beneficial for the pole component 2 to make full use of the space in the length direction of the first shell wall 111. Thus, it is beneficial for the pole component 2 to make full use of the space in the length direction of the first shell wall 111. Exemplarily, the length L1 of the first shell wall 111 is consistent with the size of the battery cell 102 in the length direction of the first shell wall 111, for example Figure 3 The length of the first shell wall 111 shown in FIG. 1 is consistent with the dimension of the battery cell 102 in the third direction F3 .

[0244] For example, please refer to Fig. 20 The shape of the mounting hole 112 matches the contour shape of the pole component 2. For example, when the pole component 2 includes the adapter structure 22, the contour shape of the adapter structure 22 (that is, the outer ring shape of the adapter structure 22) matches the shape of the mounting hole 112, thereby facilitating the connection between the pole component 2 and the first shell wall 111, and facilitating the pole component 2 to expose more area toward the accommodating cavity 13, which is conducive to accommodating the conductive part 4 and / or connecting with the conductive part 4.

[0245] Exemplarily, the shape of the mounting hole 112 matches the contour shape of the pole component 2, and is orthographically projected on a projection plane perpendicular to the thickness direction of the first shell wall 111. The orthographic projection of the mounting hole 112 on the projection plane completely falls within the orthographic projection range of the pole component 2 on the projection plane, so that the first shell wall 111 and the pole component 2 have a certain overlapping area, which is conducive to the simple and reliable connection between the two.

[0246] Fig. 20 An exploded view of a battery cell provided in some embodiments of the present application; Figure 18-Figure 20In some embodiments of the present application, the mounting hole 112 is an elongated hole (e.g., a rectangle, an ellipse, or a racetrack, etc.), and the pole component 2 is formed into an elongated structure (e.g., a rectangle, an ellipse, or a racetrack, etc.) that matches the shape of the mounting hole 112. When the electrode component 3 is first connected to the pole component 2, and then the pole component 2 and the electrode component 3 are installed into the shell body 11 together, and then the pole component 2 is extended from the mounting hole 112 to the outside of the first shell wall 111, and then the pole component 2 is turned over from the outside of the first shell wall 111 to cover the pole component 2 at the mounting hole 112, and then the pole component 2 is connected to the first shell wall 111, if the pole component 2 is set to a long strip structure that matches the shape of the mounting hole 112, the pole component 2 can be adjusted to a thickness direction that is equal to the width direction of the mounting hole 112 (e.g., Fig. 20 After the pole component 2 passes through the mounting hole 112, the thickness direction of the pole component 2 is rotated to the thickness direction of the first shell wall 111 (for example, Fig. 20 The first direction F1) shown in the figure is close, so that the space required for the flipping movement of the pole component 2 is smaller, and the space required for the flipping of the pole component 2 can be reduced, which is beneficial to shortening the length of the conductive part 4, saving materials, and reducing costs. It can also reduce the redundancy of the conductive part 4 and reduce the space occupied by the conductive part 4 in the accommodating cavity 13, which is beneficial to improving the energy density of the battery cell 102.

[0247] Please refer to Fig.21 and Fig. 22 , Fig.21 A partial cross-sectional view of a battery cell 102 provided in some embodiments of the present application, in which the pole component 2 is in a state before being covered by the first shell wall 111; Fig. 22 for Fig.21 The pole component 2 shown in FIG. 1 is a state diagram after being covered with the first shell wall 111.

[0248] Please refer to Fig.21 and Fig. 22In some embodiments, when the electrode component 3 is first connected to the pole component 2 and then the pole component 2 is assembled and connected to the first shell wall 111, the electrode component 3 and the pole component 2 can be installed together into the shell body 11 after the electrode component 3 and the pole component 2 are connected, so that the pole component 2 can be covered at the mounting hole 112 of the first shell wall 111 from the inner side of the first shell wall 111 (i.e., the side facing the active material coating portion 32), and at this time, the edge of the transition structure 22 overlaps the side of the first shell wall 111 facing the electrode component 3. Therefore, since the pole component 2 is set at the mounting hole 112 from the inner side of the first shell wall 111, the electrode component 3 and the pole component 2 can be installed together into the shell body 11, and the pole component 2 does not need to pass through the mounting hole 112, thereby reducing the operation steps and reducing the difficulty of operation.

[0249] Please refer to Fig.21 and Fig. 22 In some embodiments of the present application, when the edge of the transition structure 22 overlaps the side of the first shell wall 111 facing the electrode component 3, the edge of the transition structure 22 has a second sinking groove 22b that is open in the direction away from the electrode component 3 (that is, the second sinking groove 22b is open in the direction away from the active material coating portion 32), and the first shell wall 111 includes a lap portion 1112 protruding from the mounting hole 112, and the lap portion 1112 is embedded in the second sinking groove 22b. As a result, it is convenient to support and position the connection between the pole component 2 and the first shell wall 111, which is conducive to the welding connection between the two from the outside of the first shell wall 111 (that is, the side away from the active material coating portion 32).

[0250] Please refer again Fig.21 and Fig. 22 , exemplarily, the thickness of the overlap portion 1112 matches the groove depth T2 of the second groove 22b, wherein "matching" means that the thickness of the overlap portion 1112 is substantially consistent with the groove depth of the second groove 22b. Thus, it is convenient to weld the overlap portion 1112 to the first shell wall 111, the thickness of the overlap portion 1112 is not too large relative to the groove depth of the second groove 22b, which can reduce unnecessary space occupation, and the thickness of the overlap portion 1112 is not too small relative to the groove depth of the second groove 22b, which can meet the welding strength requirements.

[0251] In some embodiments of this application, please refer to Figure 5, the pole component 2 forms a receiving groove 5 which is recessed in the direction away from the electrode component 3 relative to the first shell wall 111 and is open in the direction of the electrode component 3, the electrode component 3 is connected to the pole component 2 through the conductive portion 4, and at least part of the conductive portion 4 is accommodated in the receiving groove 5 and is connected to the pole body 21. That is, the pole component 2 forms a receiving groove 5, the groove wall of the receiving groove 5 is formed by the pole component 2, the receiving groove 5 is recessed in the direction away from the active material coating portion 32, and the receiving groove 5 is open in the direction of the active material coating portion 32, so that the receiving groove 5 is connected to the receiving cavity 13.

[0252] Thus, by providing the receiving groove 5 to receive the conductive part 4, the space occupied by the conductive part 4 in the receiving chamber 13 can be reduced, so that the receiving chamber 13 has a larger space to receive the active material coating part 32, which is beneficial to increase the volume of the active material coating part 32, thereby increasing the energy density of the battery cell 102. Moreover, since the receiving groove 5 is open toward the electrode component 13, the conductive part 4 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0253] For example, please refer again to Figure 5 The receiving groove 5 is formed on the side of the pole body 21 and the transition structure 22 facing the electrode component 3 (i.e., the side facing the active material coating portion 32), and the transition structure 22 is raised relative to the first shell wall 111 in the direction away from the electrode component 3 (i.e., the direction away from the active material coating portion 32), so that the receiving groove 5 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3.

[0254] Therefore, by processing the adapter structure 22 into a protruding bulge, a part of the accommodating groove 5 is formed on the side of the pole body 21 facing the electrode component 3, and another part of the accommodating groove 5 is formed on the side of the adapter structure 22 facing the electrode component 3, and the accommodating groove 5 is in a shape that is recessed relative to the first shell wall 111 in the direction away from the electrode component 3, so that the side of the pole body 21 facing the electrode component 3 and the side of the adapter structure 22 facing the electrode component 3 both have a space accommodating groove conductive part 4, which not only facilitates the storage of the conductive part 4 to a greater extent, but also facilitates the design of the conductive part 4 in a variety of forms.

[0255] In other embodiments of the present application, Fig.14 When the adapter structure 22 does not protrude in the direction away from the electrode component 3 (i.e., away from the active material coating portion 32) relative to the first shell wall 111, the height difference between the adapter structure 22 and the pole body 21 can also define a receiving groove 5 that is recessed in the direction away from the electrode component 3 relative to the first shell wall 111.

[0256] In some embodiments of this application, please refer to Figure 5, the surface of one end of the pole body 21 facing the electrode component 3 is the inner end face 211 of the pole body 21, the inner end face 211 of the pole body 21 participates in forming the receiving groove 5, and the conductive part 4 is connected to the inner end face 211 of the pole body 21. That is, at least part of the inner end face 211 of the pole body 21 participates in defining the groove wall of the receiving groove 5, and the conductive part 4 is connected to the part of the inner end face 211 of the pole body 21 that serves as the groove wall of the receiving groove 5. In the above technical solution, at least part of the receiving groove 5 is surrounded by the surface of one side of the pole body 21 facing the electrode component 3, and the conductive part 4 received in the receiving groove 5 can be easily contacted and connected to the pole body 21, thereby improving the connection convenience and simplifying the structure.

[0257] Exemplarily, when at least part of the conductive portion 4 is accommodated in the accommodating groove 5, the pole connecting portion (e.g., the gathered portion 313 of the pole ear portion 33 described herein, or the second connecting segment 412 or the first conductive segment 415 of the conductive member 41) of the conductive portion 4 (e.g., the pole ear portion 33 or the conductive member 41) can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21. During processing, the pole connecting portion of the conductive portion 4 can be first loaded into the accommodating groove 5, and then the pole connecting portion can be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21.

[0258] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 of the pole ear portion 33 described herein (such as an ultrasonic weld), or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0259] For example, refer to Figure 5 Regardless of whether the adapter structure 22 bulges relative to the first shell wall 111 in a direction away from the electrode component 3, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is a surrounding area 2201 surrounding the pole body 21, and the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21. The inner end surface 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a bulging shape, and the circle of the inner end surface 220 of the adapter structure 22 that is most facing the pole body 21 is the surrounding area 2201.

[0260] For example, in combination Figure 6 and Figure 7When the inner end surface 211 of the pole body 21 is set to be larger (for example, the adapter structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the adapter structure 22), and when the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, the pole connecting part of the conductive part 4 (for example, the retracted part 313 of the pole ear part 33 described in this article, or the second connecting section 412 of the conductive member 41) can be completely laid flat on the inner end surface 211 of the pole body 21.

[0261] For example, in combination Figure 8 and Fig.12 When the inner end surface 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is arranged as a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is arranged in the center of the adapter structure 22 and has a circular outline), and when the surrounding area 2201 is flush with the inner end surface 211 of the pole body 21, a part of the pole connection part of the conductive part 4 (for example, the retracted part 313 of the pole ear part 33 described in this article, or the second connection section 412 of the conductive member 41) can be laid flat on the inner end surface 211 of the pole body 21, and the rest of the part can be laid flat on the surrounding area 2201, so that the pole connection part of the conductive part 4 (for example, the case where the pole connection part is also a long strip) can be supported as a whole, which is convenient for the pressing of the welding nozzle, so that the conductive part 4 can be reliably connected to the pole body 21.

[0262] Exemplarily, the conductive portion 4 may include a pole connecting portion, which may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 of the pole ear portion 33 described herein (such as an ultrasonic weld), or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0263] For example, refer to Fig.13 Regardless of whether the adapter structure 22 bulges relative to the first shell wall 111 in the direction away from the electrode component 3, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is the surrounding area 2201 surrounding the pole body 21, and the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction toward the electrode component 3. The inner end surface 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a bulging shape, and the circle of the inner end surface 220 of the adapter structure 22 that is most facing the pole body 21 is the surrounding area 2201.

[0264] Thus, by setting the inner end surface 211 of the pole body 21 to protrude from the surrounding area 2201 toward the direction of the electrode component 3, when the height of the pole body 21 is constant, the pole body 21 can be retracted in the direction of the accommodating cavity 13, so as to reduce the space occupied by the pole component 2 outside the shell component 1, and reduce the battery cell 102 in the direction of setting the pole component 2 (for example Figure 3 The dimension in the first direction F1) shown in FIG.

[0265] Exemplarily, when the inner end face 211 of the pole body 21 is set to be larger (for example, the transition structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the transition structure 22), and when the inner end face 211 of the pole body 21 protrudes from the surrounding area 2201 in the direction of the electrode component 3, the pole connecting portion of the conductive portion 4 (for example, the retracted portion 313 of the pole ear portion 33 described in this article, or the second connecting section 412 of the conductive member 41) can be completely laid flat on the inner end face 211 of the pole body 21.

[0266] For example, in combination Fig.13When the inner end surface 211 of the pole body 21 is relatively small (for example, the transition structure 22 is arranged as a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is arranged in the center of the transition structure 22 and has a circular outline), and when the inner end surface 211 of the pole body 21 protrudes from the surrounding area 2201 toward the direction of the electrode component 3, the conductive portion 4 can be arranged to include a pole ear portion 33 and a conductive member 41 connected to the pole ear portion 33, the conductive member 41 includes a first conductive segment 415 laid on the inner end surface 211 of the pole body 21, and a second conductive segment 416 staggered from the inner end surface 211 of the pole body 21, the second conductive segment 416 protrudes relative to the first conductive segment 415 toward a direction away from the electrode component 3 (that is, toward the outside, or toward a direction away from the active material coating portion 32), and the pole ear portion 33 is connected to the second conductive segment 416. Thus, the height difference between the inner end surface 211 of the pole body 21 and the surrounding area 2201 can be used to accommodate the second conductive segment 416 and the pole ear portion 33 of the conductive member 41, so that the space can be fully utilized, the space occupation of the conductive portion 4 in the accommodating cavity 13 can be reduced, and the energy density of the battery cell 102 can be improved. For example, if the portion where the pole ear portion 33 is connected to the second conductive segment 416 (such as the retracted portion 313 described herein) is in the shape of a long strip, the second conductive segment 416 can also be set to a long strip, and the first conductive segment 415 can be set to a circular shape that matches the pole body 21, which can meet the connection requirements. In addition, when the conductive member 41 includes the first conductive segment 415 and the second conductive segment 416, in order to ensure that the second conductive segment 416 protrudes relative to the first conductive segment 415 in the direction away from the electrode component 3, the conductive member 41 can be processed with a material having a certain hardness and thickness, for example, the conductive member 41 can be a metal sheet.

[0267] For example, refer to Fig.14 Regardless of whether the adapter structure 22 bulges relative to the first shell wall 111 in the direction away from the electrode component 3, the position of the inner end surface 220 of the adapter structure 22 adjacent to the pole body 21 is the surrounding area 2201 surrounding the pole body 21, and the surrounding area 2201 protrudes from the inner end surface 211 of the pole body 21 in the direction of the electrode component 3. Among them, the inner end surface 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a bulging shape, and the circle of the inner end surface 220 of the adapter structure 22 that is most facing the pole body 21 is the surrounding area 2201.

[0268] For example, refer to Fig.16When the inner end face 211 of the pole body 21 is set to be larger (for example, the transition structure 22 is formed into a long strip extending along the length direction of the first shell wall 111, and the contour shape of the pole body 21 matches the contour shape of the transition structure 22), and when the surrounding area 2201 protrudes from the inner end face 211 of the pole body 21 toward the electrode component 3, the pole connecting part of the conductive part 4 (for example, the retracted part 313 of the pole ear part 33 described in this article, or the second connecting section 412 of the conductive member 41) can be completely laid flat on the inner end face 211 of the pole body 21.

[0269] For example, in combination Fig.14 When the inner end face 211 of the pole body 21 is relatively small (for example, the adapter structure 22 is configured to be a long strip extending along the length direction of the first shell wall 111, and the pole body 21 is provided at the center of the adapter structure 22 and has a circular outline), and when the surrounding area 2201 protrudes from the inner end face 211 of the pole body 21 in the direction of the electrode component 3, the conductive member 41 can be configured to include a first conductive segment 415 laid on the inner end face 211 of the pole body 21, and a third conductive segment 417 staggered from the inner end face 211 of the pole body 21, the third conductive segment 417 protrudes relative to the first conductive segment 415 in the direction of the electrode component 3, and the pole ear portion 33 is connected to the third conductive segment 417. Thus, the adapter 41 can meet the connection requirements with the inner end face 211 of the pole body 21 and easily meet the connection requirements with the pole ear portion 33. In addition, when the conductive member 41 includes the first conductive segment 415 and the third conductive segment 417, in order to ensure that the third conductive segment 417 protrudes relative to the first conductive segment 415 toward the direction of the electrode component 3, the conductive member 41 can be processed with a material having a certain hardness and thickness, for example, the conductive member 41 can be a metal sheet. Exemplarily, if the portion where the pole ear portion 33 is connected to the third conductive segment 417 (such as the gathered portion 313 described herein) is in the shape of a long strip, the third conductive segment 417 can also be set to a long strip, and the first conductive segment 415 can be set to a shape that matches the matching area 211a (such as a circle), which can meet the connection requirements.

[0270] Please combine Figures 23A-23D , Figure 23A-23D An exploded view of the processing process of a battery cell provided for one embodiment of the present application. In some embodiments of the present application, the pole component 2 includes a pole body 21, the pole body 21 includes a first pole piece 21a and a second pole piece 21b, the second pole piece 21b is mounted on the first shell wall 111 and defines a matching hole 21b1, the first pole piece 21a is mounted on a side of the second pole piece 21b away from the electrode component 3 and covers the matching hole 21b1, and the electrode component 3 is connected to the first pole piece 21a through the conductive portion 4 extending into the matching hole 21b1.

[0271] Therefore, during assembly, the first pole component 21a can be connected to the conductive part 4, and the second pole component 21b can be connected to the first shell wall 111, and then the first pole component 21a and the second pole component 21b can be connected, so that the pole component 2 and the electrode component 3 can be installed on the shell body 11, which is conducive to shortening the pole ear part 33.

[0272] Please combine again Figures 23A-23D , exemplarily, the first shell wall 111 has a mounting hole 112, the second pole piece 21b is penetrated through the mounting hole 112 and clamped on the inner and outer sides of the first shell wall 111, and an insulating sealing component 24 is provided between the second pole piece 21b and the first shell wall 111. As a result, the connection between the second pole piece 21b and the first shell wall 111 is more reliable, and by providing the insulating sealing component 24, the connection between the second pole piece 21b and the first shell wall 111 can be both insulated and sealed, and the second pole piece 21b can be made of a metal material, which is beneficial to increase the conductive area of ​​the pole body 21. Exemplarily, the second pole piece 21b can be riveted to the first shell wall 111, thereby eliminating the welding process, improving the processing efficiency, and avoiding the influence of welding heat on the insulating sealing component 24. Among them, the composition of the insulating sealing component 24 is not limited, for example, it can be a single part, or it can be composed of multiple parts, for example, it can include elastic rubber parts, plastic parts, etc.

[0273] In some other embodiments of the present application, the second pole piece 21b can also be configured to be composed of multiple welded parts, or the second pole piece 21b can also be configured to be made of non-metallic material and connected to the first shell wall 111 by bonding, injection molding, etc.

[0274] Please refer again Figure 5 and Figure 7 In some embodiments of the present application, the surface of one end of the pole body 21 facing the electrode component 3 (i.e., the surface facing the active material coating portion 32) is the inner end face 211 of the pole body 21, and the electrode component 3 is connected to the inner end face 211 of the pole body 21 through the conductive portion 4 (e.g., the pole ear portion 33 or the conductive member 41). As a result, the difficulty of assembling and connecting the conductive portion 4 with the pole body 21 can be reduced, the processing efficiency can be improved, and compared with connecting with other parts of the pole body 21, it is conducive to shortening the length of the conductive portion 4, saving materials and costs.

[0275] Please refer again Figure 5 and Figure 7In some embodiments of the present application, part of the conductive portion 4 (such as the pole ear portion 33 or the conductive member 41) is laid on the inner end surface 211 of the pole body 21. In this way, by laying part of the conductive portion 4 on the inner end surface 211 of the pole body 21, the part of the conductive portion 4 is flattened, and the projection of the part falls on the inner end surface 211 of the pole body 21, which is conducive to improving the connection reliability between the conductive portion 4 and the pole body 21, and is conducive to increasing the connection area between the conductive portion 4 and the pole body 21, and improving the conductivity.

[0276] Exemplarily, the conductive portion 4 may include a pole connecting portion, at least part of which is laid on the inner end surface 211 of the pole body 21, and the pole connecting portion may be in the shape of a relatively hard plate, such as one that will not bend downward under the action of gravity, such as the retracted portion 313 of the pole ear portion 33 described herein (such as an ultrasonic weld), or the second connecting segment 412 (such as a metal sheet) or the first conductive segment 415 (such as a metal sheet) of the conductive member 41.

[0277] Please refer again Figure 18-19 , illustratively, when the battery cell 102 is in an assembled state (eg Fig.19 ), the inner end surface 211 of the pole body 21 is parallel to the axial section 34 of the electrode component 3, the axial section 34 of the electrode component 3 is perpendicular to the direction of the pole ear of the electrode component 3, and the direction of the pole ear of the pole electrode component 3 is the direction in which the active material coating portion 32 extends out of the pole ear portion 33 (for example Fig.19 The fifth direction F5 shown in FIG. 1 is perpendicular to the first shell wall 111. Thus, the processing and design of the pole body 21 are facilitated.

[0278] Please refer to Figure 24A-24B , Figure 24A-24B The processing diagram of a battery cell provided in one embodiment of the present application is an exploded view. For example, when the battery cell 102 is in an assembled state (for example Fig. 24B ), the inner end surface 211 of the pole body 21 is inclined relative to the axial section 34 of the electrode component 3, the axial section 34 of the electrode component 3 is perpendicular to the direction of the pole ear of the electrode component 3, and the direction of the pole ear of the pole electrode component 3 is the direction in which the active material coating portion 32 extends out of the pole ear portion 33 (for example Fig. 24B A fifth direction F5 is shown in FIG. 1 ), which is perpendicular to the first shell wall 111 .

[0279] Thus, before laying a part of the conductive portion 4 on the inner end surface 211 of the pole body 21, the pole component 2 can be adjusted so that the inner end surface 211 of the pole body 21 is parallel to the direction of the pole ear of the pole electrode component 3 (for example, Fig.24AThe state shown in the figure) makes it easy to lay the conductive part 4 partially on the inner end surface 211 of the pole body 21, which has a larger welding operation space. At this time, the outer end surface 213 of the pole body 21 (i.e., the side surface away from the electrode component 3) is inclined to the direction of the electrode ear of the electrode component 3 (e.g. Fig.24A In the fifth direction F5 shown in the figure, after the conductive part 4 is connected to the pole body 21, the pole component 2 is flipped as a whole by less than 90°, which can satisfy the requirement that the pole body 21 is covered on the first shell wall 111, and the outer end face 213 of the pole body 21 is parallel to the first shell wall 111, thereby the inner end face 211 of the pole body 21 is parallel to the axial section 34 of the electrode component 3, which can reduce the flipping angle of the pole component 2 during assembly, which is beneficial to shortening the length of the conductive part 4.

[0280] Figure 25A-Figure 25C This is an exploded view of the processing of an electrode component provided in one embodiment of the present application. Please refer to Figure 25A-25B In some embodiments of the present application, the pole ear portion 33 of the electrode component 3 includes a stacked portion 312 formed by stacking and gathering multiple pole ear sheets 311. Exemplarily, the electrode component 3 includes one or more electrode assemblies 31, and the electrode assembly 31 has a positive pole ear sheet 311 and a negative pole ear sheet 311. Multiple pole ear sheets 311 of the same polarity are stacked and gathered to form the stacked portion 312, so as to facilitate the pretreatment of the pole ear portion 33 or the connection operation with other components.

[0281] Exemplarily, the multiple layers of tab sheets 311 in the stacking section 312 may belong to the same electrode assembly 31, or may respectively belong to different electrode assemblies 31, that is, several layers of tab sheets 311 of the same polarity in the same electrode assembly 31 may be gathered together to form the stacking section 312, or several layers of tab sheets 311 of the same polarity in different electrode assemblies 31 may be gathered together to form the stacking section 312. Exemplarily, all the tab sheets 311 of the same polarity in the electrode component 3 may be gathered together to form the stacking section 312, so that the number of stacking sections 312 can be reduced.

[0282] For example, please refer to Figure 25B-Figure 25C, the multi-layered pole tabs 311 in the lamination part 312 are connected to form a gathering part 313, that is, the pole tab part 33 includes a gathering part 313 formed by stacking and connecting the multi-layered pole tabs 311. In this way, by connecting the multi-layered pole tabs 311 in the lamination part 312 to form the gathering part 313, the multi-layered pole tabs 311 in the gathering part 313 are electrically conductive, that is, the multi-layered pole tabs 311 in the gathering part 313 not only present a stacked arrangement relationship, but also have a connection and conductive relationship. Among them, the connection method of the multi-layered pole tabs 311 in the gathering part 313 is not limited, for example, it can be welding (such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure melting welding, or brazing, etc.), or perforation connection, or bonding by conductive adhesive, etc. For example, the multi-layered pole tabs 311 of the same polarity can be ultrasonically welded, and the ultrasonic weld mark formed is the gathering part 313.

[0283] Exemplarily, the multiple layers of tab sheets 311 in the gathered portion 313 may belong to the same electrode assembly 31, or may respectively belong to different electrode assemblies 31, that is, several layers of tab sheets 311 of the same polarity in the same electrode assembly 31 may be connected to form the gathered portion 313, or several layers of tab sheets 311 of the same polarity in different electrode assemblies 31 may be connected to form the gathered portion 313. Exemplarily, all tab sheets 311 of the same polarity in the electrode component 3 may be connected to form the gathered portion 313, so that the number of the gathered portions 313 may be reduced.

[0284] In the above technical solution, the multi-layer pole ear sheets 311 in the pole ear portion 33 are pre-connected to form a gathered portion 313. The gathered portion 313 can present the form of a plate in which the multi-layer pole ear sheets 311 are connected together and have a certain rigidity, rather than a fluffy multi-layer foil form, thereby facilitating the assembly and connection operations between the pole ear portion 33 and other components, such as punching operations and welding operations, etc., so that pores are not easily formed in the weld formed by the pole ear portion 33 and other components, which can improve the connection reliability and conductivity of the welding point, and make the conductivity of the electrode component 3 and the pole column component 2 more stable and reliable.

[0285] Please refer again Figure 7In some embodiments of the present application, the pole component 2 includes a pole body 21, the electrode component 3 includes an active material coating portion 32 accommodated in the accommodating cavity 13, and a pole ear portion 33 connected to the active material coating portion 32, and the pole ear portion 33 extends to the pole body 21 and is connected to the pole body 21. Thus, the conductive portion 4 may only include the pole ear portion 33, and the pole ear portion 33 is directly connected to the pole body 21, so that the use of the conductive member 41 can be omitted, and the step of connecting the conductive member 41 with the pole ear portion 33 can be omitted. Moreover, by pre-connecting the multiple layers of pole ear sheets 311 in the pole ear portion 33 to form a gathered portion 313, the gathered portion 313 can present the form of a plate in which the multiple layers of pole ear sheets 311 are connected together and have a certain rigidity, rather than a fluffy and scattered multiple layers of foil, thereby facilitating the coordinated connection between the pole ear portion 33 and the pole body 21, making the welding of the pole ear portion 33 and the pole body 21 more reliable, and less likely to form pores in the weld, which can improve the connection reliability and conductivity of the welding point, making the conductivity between the electrode component 3 and the pole component 2 more stable and reliable.

[0286] Please refer again Figure 7 and Fig.12 , exemplarily, the surface of one end of the pole body 21 facing the electrode component 3 is the inner end face 211 of the pole body 21, and the pole ear portion 33 includes a gathering portion 313 formed by stacking and connecting multiple pole ear sheets 311, and 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. Thus, by laying at least a portion of the gathering portion 313 on the inner end face 211 of the pole body 21, the gathering portion 313 is in a flattened state, and at least a portion of the gathering portion 313 falls on the inner end face 211 of the pole body 21, so that the pole ear portion 33 will not be damaged due to the bending of the gathering portion 313, thereby improving the conductive performance, and facilitating the welding pressure nozzle to press the gathering portion 313, thereby improving the connection reliability between the gathering portion 313 and the pole body 21. Moreover, by laying at least part of the gathered portion 313 on the inner end surface 211 of the pole body 21 and connecting to the inner end surface 211 of the pole body 21 , it is helpful to increase the connection area, connection reliability and current carrying capacity between the pole ear portion 33 and the pole body 21 .

[0287] Please refer again Figure 7 In some embodiments of the present application, the entirety of the gathered portion 313 is laid on the inner end surface 211 of the pole body 21. That is, the inner end surface 211 of the pole body 21 is greater than or equal to the area of ​​the gathered portion 313, so that the gathered portion 313 can completely fall on the inner end surface 211 of the pole body 21, thereby facilitating the increase of the connection area between the inner end surface 211 of the pole body 21 and the gathered portion 313, and improving the current passing efficiency.

[0288] In some embodiments of this application, please refer to Figure 5, the pole component 2 includes a pole body 21, the electrode component 3 includes an active material coating portion 32 accommodated in the accommodating cavity 13, and a pole ear portion 33 connected to the active material coating portion 32, and the pole ear portion 33 is connected to the pole body 21 through a conductive member 41. Therefore, by indirectly connecting the pole ear portion 33 and the pole body 21 through the conductive member 41, the length of the pole ear portion 33 can be shortened, and the problems of wrinkling, bending and breaking of the pole ear sheet 311 can be improved. Moreover, by flexibly designing the shape and material of the conductive member 41, the difficulty of connecting with the pole body 21 can be reduced, and the convenience of connecting the conductive member 41 with the pole body 21 can be improved. In addition, the perforation operation of the conductive portion 4, the connection operation of the conductive portion 4 with the pole component 2 (which may not be required), and the connection operation of the pole component 2 with the shell component 1 are not likely to cause cracking at the connection position between the active material coating portion 32 and the pole ear portion 33, thereby improving the reliability of the battery cell 102.

[0289] By way of example, the laminated part 312 may be connected to the conductive member 41, thereby eliminating the step of connecting the laminated part 312 to form the gathered part 313. Alternatively, by way of example, the gathered part 313 may be connected to the conductive member 41 after the multilayered tabs 311 in the laminated part 312 are connected to form the gathered part 313, thereby flexibly and diversely designing the structural form of the conductive member 41.

[0290] Exemplarily, the conductive member 41 may be connected to the inner end surface 211 of the pole body 21, thereby shortening the length of the conductive member 41. For example, the conductive member 41 may include a second connection segment 412, which may be laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21, thereby improving the connection reliability and conductive performance of the conductive member 41 and the pole body 21. Alternatively, exemplarily, the conductive member 41 may also be connected to other positions of the pole body 21, for example, the conductive member 41 may be pre-buried in the pole body 21, or may be penetrated in the pole body 21 to be connected to the pole body 21, etc.

[0291] Figure 26A-26D A processing diagram of a battery cell provided in one embodiment of the present application is shown in FIG. Figure 26A-26D, the conductive member 41 includes a first connecting section 411, the first connecting section 411 includes two clamping parts 4110, the pole ear portion 33 includes a pole ear end 331, and the pole ear end 331 is clamped between the two clamping parts 4110 and connected to the clamping part 4110. Among them, the pole ear end 331 can be a laminated part 312 or a gathered part 313. Therefore, the two clamping parts 4110 can be used to limit the pole ear end 331, thereby improving the connection reliability of the multi-layer pole ear sheets 311 in the pole ear end 331. In addition, in some examples, by providing two clamping parts 4110, the pole ear end 331 clamped between the two clamping parts 4110 can be in the state of the laminated part 312, and the step of connecting the multi-layer pole ear sheets 311 in the laminated part 312 to form the gathered part 313 can be omitted, thereby simplifying the processing process and improving the processing efficiency.

[0292] Combination Figure 26A-26D , exemplarily, the conductive member 41 includes a second connecting segment 412, the second connecting segment 412 is laid on the inner end surface 211 of the pole body 21 and connected to the inner end surface 211 of the pole body 21, and the conductive member 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, and one of the clamping portions 4110 is supported on the side of the pole ear end 331 away from the pole body 21 (for example Fig.26D As shown). Thus, the support of the pole ear portion 33 by the clamping portion 4110 can improve the redundancy of the pole ear portion 33 and reduce the risk of short circuit caused by the pole ear portion 33 being inserted into the active material coating portion 32. In addition, the bent conductive member 41 can play a role of buffer support, reduce the risk of the electrode component 3 hitting the shell component 1, and improve the reliability of the battery cell 102.

[0293] In addition, in order to facilitate bending, the conductive member 41 can be set to be in the form of reduced material at the connection position between the first connecting segment 411 and the second connecting segment 412, for example, the width can be shortened, or the thickness can be thinned, etc. In this way, the first connecting segment 411 and the second connecting segment 412 can respectively have a certain rigidity, which is convenient for the first connecting segment 411 to be connected to the pole ear portion 33, and to facilitate the connection between the second connecting segment 412 and the pole body 21, and at the same time, it is also convenient for the conductive member 41 to be bent at the connection position between the first connecting segment 411 and the second connecting segment 412.

[0294] Figure 27A-27C This is an exploded view of the processing of a battery cell provided in one embodiment of the present application. In some embodiments of the present application, please refer to Figure 27A-27CThe pole ear portion 33 includes a gathered portion 313 formed by stacking and connecting multiple pole ear sheets 311, and the conductive member 41 includes a first connecting segment 411. The gathered portion 313 is stacked on one side of the first connecting segment 411 in the thickness direction and connected to the first connecting segment 411. The first connecting segment 411 is in the form of a plate, and the first connecting segment 411 and the gathered portion 313 have the same thickness direction. The two are stacked along the thickness direction of the first connecting segment 411, so that the matching mode of the gathered portion 313 and the conductive member 41 is simple, which is conducive to improving production efficiency.

[0295] Please refer again Fig.27C For example, the first connecting section 411 is supported on the side of the gathering portion 313 away from the pole body 21, so that the gathering portion 313 is sandwiched between the inner end surface 211 of the pole body 21 and the first connecting section 411. Thus, the redundancy of the pole ear portion 33 can be improved by supporting the gathering portion 313 by the first connecting section 411, and the risk of short circuit caused by the pole ear portion 33 being inserted into the active material coating portion 32 can be reduced.

[0296] In some embodiments of this application, please refer to Figure 5 The pole component 2 includes a pole body 21, and the electrode component 3 includes an active material coating portion 32 accommodated in the accommodating cavity 13. The active material coating portion 32 is connected to the pole body 21 through the conductive portion 4. The conductive portion 4 is bent to form at least two open grooves 42, wherein the openings of the two open grooves 42 are in different directions and are adjacent in the direction from the pole body 21 to the active material coating portion 32 (for example Figure 5 As shown, one of the two upper and lower adjacent open slots 42 has an opening facing left, and the other opening facing right). As a result, the conductive portion 4 can present a reciprocating serpentine shape, and the conductive portion 4 can play a buffering role. When the battery cell 102 is used in a vibration environment, the impact of the active material coating portion 32 toward the first shell wall 111 can be reduced, which plays a role in protecting the electrode component 3 and improving the reliability of the battery cell 102. Moreover, since the conductive portion 4 does not extend irregularly, the mutual interference and scratching between the pole tabs 311 and the pole tabs 311 in the conductive portion 4, as well as the risk of the pole tabs 311 being inserted upside down into the active material coating portion 32 can be improved, thereby further improving the reliability of the battery cell 102.

[0297] For example, please refer again to Figure 5When the conductive portion 4 includes the pole ear portion 33 and the conductive member 41 connected to the pole ear portion 33, and the pole ear portion 33 is connected to the pole body 21 through the conductive member 41, the conductive member 41 and the pole ear portion 33 are bent together to form two opening grooves 42 with opposite opening directions and adjacent to each other. For example, an opening groove 42 is defined between the first connecting section 411 and the second connecting section 412, and another opening groove 42 is defined between the first connecting section 411 and the pole ear portion 33. Thus, the conductive portion 4 can present a reciprocatingly bent S shape, thereby shortening the length of the conductive portion 4, simplifying the structure of the conductive portion 4, and facilitating the processing of the conductive portion 4. Alternatively, for example, please refer to Fig.16 When the pole ear portion 33 constitutes the conductive portion 4 to extend to the pole body 21 and is connected to the pole body 21, the pole ear portion 33 is bent alone to form two opening slots 42 with openings facing opposite and adjacent to each other, the pole ear portion 33 is bent alone to form two opening slots 42 with openings facing opposite and adjacent to each other.

[0298] In some embodiments of this application, please refer to Figure 3 The battery cell 102 further includes a pressure relief device 6, which is provided on the housing component 1. Exemplarily, the pressure relief device 6 may be an explosion-proof valve installed on the housing component 1, or may be integrally formed in a thinned area of ​​the housing component 1. Thus, by providing the pressure relief device 6, when the pressure in the housing component 1 exceeds a preset value, the pressure may be released in a directional manner through the pressure relief device 6, thereby improving the safety and reliability of the battery cell 102.

[0299] For example, in combination Figure 3 , the pressure relief device 6 is located on the same side as the pole component 2. Since the pole component 2 is provided on the first shell wall 111, when the pressure relief device 6 is also provided on the first shell wall 111, the pressure relief device 6 is located on the same side as the pole component 2. Thus, the design of other shell walls other than the first shell wall 111 can be simplified, and the structure and processing of the battery cell 102 can be simplified.

[0300] Exemplarily, the pressure relief device 6 is located on the opposite side from the pole component 2. Since the pole component 2 is arranged on the first shell wall 111, when the pressure relief device 6 is also arranged on other walls of the housing component 1 except 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 arranged on the second shell wall 114, or the pressure relief device 6 is arranged on the shell cover 12, then the pressure relief device 6 is located on the opposite side from the pole component 2. Therefore, there is no need to consider that the pressure relief device 6 occupies the space of the first shell wall 111 and reduces the volume of the pole component 2, so that the shape and area of ​​the pole component 2 can be flexibly designed as needed.

[0301] For example, in combination Figure 6, the pressure relief device 6 and the pole component 2 are located on different sides. Since the pole component 2 is arranged on the first shell wall 111, when the pressure relief device 6 is arranged on other walls of the housing component 1 except 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, the pressure relief device 6 is arranged on the second shell wall 114, or the pressure relief device 6 is arranged on the shell cover 12, then the pressure relief device 6 and the pole component 2 are located on different sides. Therefore, there is no need to consider that the pressure relief device 6 occupies the space of the first shell wall 111 and reduces the volume of the pole component 2, so that the shape and area of ​​the pole component 2 can be flexibly designed according to needs.

[0302] The shell component 1 can be surrounded by multiple non-coplanar walls. For example, the rectangular shell component 1 is surrounded by six walls, one of which is the first shell wall 111. The pressure relief device 6 is arranged on any other wall other than the first shell wall 111, and the pole component 2 is arranged on the first shell wall 111, and the two are located on different sides.

[0303] According to the second aspect of the present application, the present application also provides a battery 100, including a battery cell 102 of any of the above solutions. It is worth noting that the battery 100 according to the embodiment of the present application may include a box body 101, or may not include a box body 101. Therefore, since the reliability of the battery cell 102 according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery 100.

[0304] Exemplarily, the battery 100 may further include a busbar component, and the battery cells 102 are multiple and at least two are electrically connected through the busbar component. Thus, the series connection and / or parallel connection of multiple battery cells 102 can be achieved. For example, when multiple battery cells 102 are connected in series, the pole component 2 of the negative electrode of one battery cell 102 is connected to the pole component 2 of the positive electrode of the next battery cell 102 through a busbar component, and at the same time, the pole component 2 of the positive electrode of the battery cell 102 is connected to the pole component 2 of the negative electrode of the previous battery cell 102 through another busbar component.

[0305] For example, in combination Figure 2 The battery 100 includes a box body 101, a plurality of battery cells 102 are contained in the box body 101, and the bottom of the box body 101 is a box body bottom plate 1013. The pole component 2 is arranged on the side of the shell component 1 facing the box body bottom plate 1013, or on the side of the shell component 1 away from the box body bottom plate 1013.

[0306] When the battery 100 is in use, for example, when it is used in a vehicle, the box bottom plate 1013 is located at the bottom of the box 101 in the direction of gravity. Thus, when the pole component 2 is arranged on the side of the shell component 1 facing the box bottom plate 1013, it means that the pole component 2 is located at the bottom of the shell component 1 in the direction of gravity; and when the pole component 2 is arranged on the side of the shell component 1 away from the box bottom plate 1013, it means that the pole component 2 is located at the top of the shell component 1 in the direction of gravity. Therefore, the relative position of the pole component 2 and the box bottom plate 1013 is not limited, and the orientation of the battery cell 102 and the box 101 can be flexibly set.

[0307] Among them, when the pole component 2 of the battery cell 102 is arranged on the side of the shell component 1 facing the box bottom plate 1013, the battery cell 102 is in an inverted state, and the pressure relief product is sprayed in the direction away from the passenger compartment, which is safer; when the pole component 2 of the battery cell 102 is arranged on the side of the shell component 1 close to the box bottom plate 1013, the battery cell 102 is in an upright state, and the electrolyte is not easy to leak.

[0308] According to the third aspect of the present application, the present application also provides an electric device, including the battery 100 of any of the above solutions, and the battery 100 is used to provide power to the electric device. The electric device can be any of the above-mentioned devices or systems using the battery 100. Since the performance of the battery 100 is improved, it is beneficial to improve the working power performance of the electric device.

[0309] Some specific embodiments according to the present application are described below.

[0310] Embodiment 1

[0311] Combination Figure 28A-Figure 28D The shell component 1 has a receiving cavity 13, and includes a shell body 11 that participates in forming the receiving cavity 13, one end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111, and the first shell wall 111 has a mounting hole 112; the pole component 2 is installed on the first shell wall 111, and is covered at the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31, so as to have an active material coating portion 32 accommodated in the receiving cavity 13, and a pole ear portion 33 connected to the active material coating portion 32, and the pole ear portion 33 is connected to the pole component 2. The pole component 2 includes a pole body 21, a transition structure 22, and an insulating structure 23, the transition structure 22 surrounds the pole body 21, the insulating structure 23 is insulated and matched between the pole body 21 and the transition structure 22, the transition structure 22 is connected to the first shell wall 111, and the pole body 21 is connected to the pole ear portion 33.

[0312] Combination Figure 28A-Figure 28DWhen processing the battery cell 102, a plurality of electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (for example, the fourth direction F4 shown in the figure), and the multi-layered pole ear sheets 311 of the plurality of electrode assemblies 31 with the same polarity are stacked and connected to form a gathering portion 313, and then the gathering portion 313 is connected to the pole body 21, and the electrode component 3 is installed into the shell body 11 in the direction of the pole ear portion 33 relative to the active material coating portion 32 toward the mounting hole 112. As the electrode component 3 moves into the shell body 11, the gathering portion 313 passes through to the outside of the mounting hole 112, and the gathering portion 313 is connected to the pole column component 2 disposed on the outside of the first shell wall 111 on the outside of the first shell wall 111, and then the pole column component 2 connected with the gathering portion 313 is covered with the mounting hole 112 from the outside of the first shell wall 111, and then the adapter structure 22 is welded and fixed to the first shell wall 111.

[0313] The welding position between the pole component 2 and the retracted portion 313 is located outside the shell body 11 , which can improve the problem of conductive chips generated during welding entering the shell body 11 and causing damage to the electrode component 3 .

[0314] Embodiment 2

[0315] Combination Figure 29A-Figure 29D The shell component 1 has a receiving cavity 13, and includes a shell body 11 that participates in forming the receiving cavity 13, one end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111, and the first shell wall 111 has a mounting hole 112; the pole component 2 is installed on the first shell wall 111, and is covered at the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31, so as to have an active material coating portion 32 accommodated in the receiving cavity 13, and a pole ear portion 33 connected to the active material coating portion 32, and the pole ear portion 33 is connected to the pole component 2. The pole component 2 includes a pole body 21, a transition structure 22, and an insulating structure 23, the transition structure 22 surrounds the pole body 21, the insulating structure 23 is insulated and matched between the pole body 21 and the transition structure 22, the transition structure 22 is connected to the first shell wall 111, and the pole body 21 is connected to the pole ear portion 33.

[0316] Combination Figure 29A-Figure 29DWhen processing the battery cell 102, a plurality of electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (for example, the fourth direction F4 shown in the figure), and the multi-layered pole tabs 311 of the plurality of electrode assemblies 31 with the same polarity are stacked and connected to form a gathering portion 313, and then the gathering portion 313 is connected to the pole body 21, and the electrode component 3 and the pole component 2 connected to the gathering portion 313 are installed into the shell body 11 according to the direction of the pole component 2 relative to the active material coating portion 32 toward the mounting hole 112. As the electrode component 3 moves into the shell body 11, the pole component 2 passes through the mounting hole 112 to the outside of the first shell wall 111, and then the pole component 2 connected with the gathering portion 313 is covered with the mounting hole 112 from the outside of the first shell wall 111, and then the adapter structure 22 is welded and fixed to the first shell wall 111.

[0317] The pole component 2 and the retracted portion 313 are not yet installed in the shell body 11 during welding, which can improve the problem of conductive chips formed during welding entering the shell body 11 and causing damage to the electrode component 3.

[0318] Embodiment 3

[0319] Combination Figures 30A-30D The shell component 1 has a receiving cavity 13, and includes a shell body 11 that participates in forming the receiving cavity 13, one end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111, and the first shell wall 111 has a mounting hole 112; the pole component 2 is installed on the first shell wall 111, and is covered at the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31, so as to have an active material coating portion 32 accommodated in the receiving cavity 13, and a pole ear portion 33 connected to the active material coating portion 32, and the pole ear portion 33 is connected to the pole component 2. The pole component 2 includes a pole body 21, a transition structure 22, and an insulating structure 23, the transition structure 22 surrounds the pole body 21, the insulating structure 23 is insulated and matched between the pole body 21 and the transition structure 22, the transition structure 22 is connected to the first shell wall 111, and the pole body 21 is connected to the pole ear portion 33.

[0320] Combination Figures 30A-30D When processing the battery cell 102, a plurality of electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (for example, the fourth direction F4 shown in the figure), and the multi-layered pole tabs 311 of the plurality of electrode assemblies 31 with the same polarity are stacked and connected to form a gathering portion 313, and then the gathering portion 313 is connected to the pole body 21, and the electrode component 3 and the pole component 2 connected to the gathering portion 313 are installed into the shell body 11 according to the direction of the pole component 2 relative to the active material coating portion 32 toward the mounting hole 112, and then the pole component 2 is covered with the mounting hole 112 from the inner side of the first shell wall 111, and then the adapter structure 22 is welded and fixed to the first shell wall 111.

[0321] The pole component 2 and the retracted portion 313 are not yet installed in the shell body 11 during welding, which can improve the problem of conductive chips formed during welding entering the shell body 11 and causing damage to the electrode component 3.

[0322] Embodiment 4

[0323] Combination Figure 31A-Figure 31E The shell component 1 has a housing cavity 13 and includes a shell body 11 that participates in forming the housing 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 component 2 is mounted on the first shell wall 111 and blocked at the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31, so as to have an active material coating portion 32 accommodated in the housing cavity 13, and a pole ear portion 33 connected to the active material coating portion 32. The pole ear portion 33 is connected to the pole component 2. The pole component 2 includes a pole body 21 and an insulating sealing component 24. The pole body 21 includes a first pole piece 21a and a second pole piece 21b. The second pole piece 21b defines a matching hole 21b1. The first pole piece 21a is arranged on a side of the second pole piece 21b away from the electrode component 3 and covers the matching hole 21b1. The second pole piece 21b is connected to the first shell wall 111, and the first pole piece 21a is connected to the pole ear portion 33.

[0324] Combination Figure 31A-Figure 31E When processing the battery cell 102, a plurality of electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure), and the multi-layered pole tabs 311 of the plurality of electrode assemblies 31 with the same polarity are stacked and connected to form a gathered portion 313. Then, on one hand, the gathered portion 313 is connected to the first pole piece 21a, and on the other hand, the second pole piece 21b is assembled to the first shell wall 111 by riveting, and the insulating sealing component 24 is clamped between the second pole piece 21b and the first shell wall 111. Thereafter, the electrode component 3 and the first pole component 21a connected to the gathering portion 313 can be installed into the shell body 11 in the direction of the first pole component 21a relative to the active material coating portion 32 toward the mounting hole 112. As the electrode component 3 moves into the shell body 11, the first pole component 21a passes through the matching hole 21b1 to the outside of the first shell wall 111. Then, the first pole component 21a connected to the gathering portion 313 is covered with the matching hole 21b1 from the outside of the first shell wall 111, and then the first pole component 21a and the second pole component 21b are welded and fixed.

[0325] The retracted portion 313 is not yet installed in the shell body 11 when being welded to the first pole piece 21 a , which can improve the problem of conductive scraps formed during welding entering the shell body 11 and damaging the electrode component 3 .

[0326] Embodiment 5

[0327] Combination Figures 23A-23D The difference between the fifth embodiment and the fourth embodiment is that the gathered portion 313 is first passed through the matching hole 21b1, and then the gathered portion 313 and the first pole piece 21a are welded, which will not be described here.

[0328] It is worth noting that the above-mentioned embodiments 1 to 5 are intended to illustrate the processing sequence of the battery cell 102, but the specific structure of the electrode cell 102 is not limited. For example, the pole ear portion 33 and the pole column component 2 in the above-mentioned embodiments 1 to 5 can be directly connected, or can be connected through the conductive member 41 of the embodiment of the present application. For another example, the form of the transition structure 22 of the pole column component 2 in the above-mentioned embodiments 1 to 3 is not limited, the form of the insulating structure 23 is not limited, and the form of the pole body 21 is not limited. All of them can refer to any of the above-mentioned embodiments of the present application and will not be repeated here.

[0329] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0330] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: The shell component has a receiving cavity and includes a shell body that participates in surrounding the receiving cavity, the shell body is an integral piece and has an opening at one end, and the end of the shell body opposite to the opening is a first shell wall; A pole component, mounted on the first shell wall; The electrode component is accommodated in the accommodating cavity and connected to the pole component.

2. The battery cell according to claim 1, characterized in that: The pole component comprises a pole body, a transition structure and an insulating structure. The transition structure surrounds the pole body and is connected to the first shell wall. The insulating structure is insulated and fitted between the transition structure and the pole body. The electrode component is connected to the pole body.

3. The battery cell according to claim 2, characterized in that: The transition structure is formed into a long strip extending along the length direction of the first shell wall, and the contour shape of the pole body matches the contour shape of the transition structure; Alternatively, the transition structure is formed into a long strip extending along the length direction of the first shell wall, and the pole body is arranged at the length center position of the transition structure and is circular.

4. The battery cell according to claim 2, characterized in that: The insulating structure is sealed and fitted between the transition structure and the pole body.

5. The battery cell according to claim 4, characterized in that: The insulating structure comprises a sealing structure, which is arranged around the peripheral side of the transition structure facing the pole body and is at least partially clamped between the transition structure and the pole body in the inner and outer directions of the first shell wall.

6. The battery cell according to claim 5, characterized in that: The pole body includes a peripheral portion, the transition structure is clamped on both sides of the peripheral portion in the inner and outer directions of the first shell wall through the insulating structure, and at least part of the sealing structure is clamped between the peripheral portion facing the electrode component and the transition structure.

7. The battery cell according to claim 5, characterized in that: The transition structure includes a mating ring portion, the pole body includes a penetration portion passing through the mating ring portion, and an inner limit portion and an outer limit portion connected to the penetration portion and clamped on the inner and outer sides of the mating ring portion, and at least a portion of the sealing structure is clamped between the mating ring portion and the inner limit portion.

8. The battery cell according to claim 2, characterized in that: The first shell wall has a mounting hole, a sealing ring is arranged around the mounting hole, and the sealing ring is clamped between the pole component and the first shell wall.

9. The battery cell according to claim 2, characterized in that: The first shell wall is provided with a mounting hole, the pole component is covered in the mounting hole, and the edge of the transition structure is overlapped on one side of the first shell wall in the wall thickness direction.

10. The battery cell according to claim 9, characterized in that: The edge of the transition structure overlaps the side of the first shell wall away from the electrode component. The first shell wall has a first recessed groove arranged around the mounting hole. The first recessed groove is open in a direction away from the electrode component. The edge of the transition structure has a flange portion embedded in the first recessed groove.

11. The battery cell according to claim 9, characterized in that: The edge of the transition structure overlaps the side of the first shell wall away from the electrode component, the mounting hole is a long strip hole, and the pole component is formed into a long strip structure matching the shape of the mounting hole.

12. The battery cell according to claim 9, characterized in that: The edge of the transition structure overlaps the side of the first shell wall facing the electrode component, and the edge of the transition structure has a second recessed groove open in a direction away from the electrode component. The first shell wall includes a overlapping portion protruding into the mounting hole, and the overlapping portion is embedded in the second recessed groove.

13. The battery cell according to claim 9, characterized in that: The transition structure is connected to the first shell wall by welding.

14. The battery cell according to claim 13, characterized in that: A weld formed by welding the transition structure to the first shell wall is exposed on a side of the first shell wall away from the electrode component.

15. The battery cell according to claim 2, characterized in that: The pole component is surrounded by a receiving groove which is recessed relative to the first shell wall in a direction away from the electrode component and is open in a direction toward the electrode component. The electrode component is connected to the pole component through a conductive part, and at least part of the conductive part is received in the receiving groove and connected to the pole body.

16. The battery cell according to claim 15, characterized in that: The accommodating groove is formed on the side of the pole body and the transition structure facing the electrode component, and the transition structure bulges relative to the first shell wall in a direction away from the electrode component, so that the accommodating groove is recessed relative to the first shell wall in a direction away from the electrode component.

17. The battery cell according to claim 15, characterized in that: The surface of one end of the pole body facing the electrode component is the inner end surface of the pole body, the inner end surface of the pole body participates in forming the accommodating groove, and the conductive part is connected to the inner end surface of the pole body.

18. The battery cell according to claim 17, characterized in that: The position of the inner end surface of the transition structure adjacent to the pole body is a surrounding area surrounding the pole body, and the surrounding area is flush with the inner end surface of the pole body, or the inner end surface of the pole body protrudes from the surrounding area in the direction of the electrode component, or the surrounding area protrudes from the inner end surface of the pole body in the direction of the electrode component.

19. The battery cell according to claim 1, characterized in that: The pole component includes a pole body, and the pole body includes a first pole component and a second pole component. The second pole component is installed on the first shell wall and defines a matching hole. The first pole component is installed on a side of the second pole component away from the electrode component and covers the matching hole. The electrode component is connected to the first pole component via a conductive portion extending into the matching hole.

20. The battery cell according to claim 19, characterized in that: The first shell wall has a mounting hole, the second pole piece is passed through the mounting hole and clamped at the inner and outer sides of the first shell wall, and an insulating sealing component is provided between the second pole piece and the first shell wall.

21. The battery cell according to claim 1, characterized in that: The pole component includes a pole body, a surface of the pole body facing one end of the electrode component is the inner end surface of the pole body, the electrode component is connected to the inner end surface of the pole body through a conductive part, and a part of the conductive part is laid on the inner end surface of the pole body.

22. The battery cell according to claim 21, characterized in that: The inner end surface of the pole body is inclined relative to the axial cross section of the electrode component, and the axial cross section of the electrode component is perpendicular to the direction of the electrode tab of the electrode component.

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

24. The battery cell according to claim 23, characterized in that: The surface of one end of the pole body facing the electrode component is the inner end face of the pole body, and the pole ear portion includes a gathered portion formed by stacking and connecting multiple layers of pole ear sheets, and at least part of the gathered portion is laid on the inner end face of the pole body and connected to the inner end face of the pole body.

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

26. The battery cell according to claim 25, characterized in that: The conductive member includes a first connecting section, the first connecting section includes two clamping parts, the pole lug portion includes a pole lug end portion, the pole lug end portion is clamped between the two clamping parts and connected to the clamping parts.

27. The battery cell according to claim 26, characterized in that: The surface of one end of the pole body facing the electrode component is the inner end face of the pole body, the conductive member includes a second connecting segment, the second connecting segment is laid on the inner end face of the pole body and connected to the inner end face of the pole body, the conductive member is bent at the connecting position between the first connecting segment and the second connecting segment, so that the first connecting segment is located on the side of the second connecting segment away from the pole body, and one of the clamping portions is supported on the side of the pole ear end away from the pole body.

28. The battery cell according to claim 25, characterized in that: The pole ear portion includes a gathered portion formed by stacking and connecting multiple pole ear sheets, and the conductive member includes a first connecting segment. The gathered portion is stacked on one side of the first connecting segment in a thickness direction and connected to the first connecting segment.

29. The battery cell according to claim 28, characterized in that: The surface of one end of the pole body facing the electrode component is the inner end surface of the pole body, and the first connecting section is supported on the side of the gathering portion away from the pole body so that the gathering portion is clamped between the inner end surface of the pole body and the first connecting section.

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

31. The battery cell according to claim 30, characterized in that: The electrode component includes a pole ear portion connected to the active material coating portion, the pole ear portion constitutes the conductive portion to extend to the pole body and is connected to the pole body, and the pole ear portion is bent alone to form two adjacent opening grooves with openings facing opposite directions; or, the electrode component includes a pole ear portion connected to the active material coating portion, the conductive portion includes the pole ear portion and a conductive member connected to the pole ear portion, the pole ear portion is connected to the pole body through the conductive member, and the conductive member and the pole ear portion are bent together to form two adjacent opening grooves with openings facing opposite directions.

32. The battery cell according to claim 1, characterized in that The housing component further comprises a matching shell, the shell body is in a semi-closed cylindrical shape, and the matching shell cover is arranged on the opening; Wherein, the matching shell is in the shape of a flat plate or a semi-closed cylinder.

33. The battery cell according to any one of claims 1 to 32, characterized in that: It also includes a pressure relief device, which is arranged on the shell component and is located on the same side or the opposite side as the pole component.

34. A battery, characterized in that: Comprising a battery cell according to any one of claims 1-33.

35. The battery according to claim 34, characterized in that The battery comprises a box body, the battery cells are multiple and are accommodated in the box body, the bottom of the box body is the box body bottom plate, and the pole component is arranged on the side of the shell component facing the box body bottom plate, or on the side of the shell component away from the box body bottom plate.

36. An electrical device, characterized in that: Comprising a battery according to claim 34 or 35.

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