Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly, a fixing piece, an electrode terminal and a first insulating piece, the housing has a wall portion. The electrode assembly is housed within the housing. The fixing piece is connected to the wall part and comprises a fixing part, and the fixing part is located on one side of the wall part in the thickness direction of the wall part. The electrode terminal is provided on the wall portion, and the electrode terminal is electrically connected to the electrode assembly. The first insulating piece is arranged between the electrode terminal and the fixing piece so as to insulate and isolate the electrode terminal and the fixing piece. The fixing part comprises a main body area and a thinning area which are connected with each other, the thinning area is farther away from the wall part than the main body area in the thickness direction of the wall part, the electrode terminal is provided with an assembling part extending to the position between the thinning area and the wall part, and the projection of the main body area and the projection of the assembling part are not overlapped; the thinned region is configured to cooperate with the wall portion to restrict movement of the electrode terminal in a thickness direction of the wall portion.

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. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. As the core components of new energy vehicles, batteries have high requirements in terms of performance and endurance. The battery cell of the battery usually includes a shell and an electrode assembly contained in the shell, and the shell is provided with electrode terminals. By electrically connecting the electrode terminals to the electrode assembly, the input or output of electrical energy of the battery cell can be realized. However, the assembly space required for the electrode terminals of the existing battery cells is large, and the size of the electrode terminals is large, which results in a large space occupied by the electrode terminals after being assembled on the shell, which is not conducive to improving the energy density of the battery cell. Utility Model Content

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

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly, a fixing member, an electrode terminal and a first insulating member; the shell has a wall portion; the electrode assembly is accommodated in the shell; the fixing member is connected to the wall portion, the fixing member includes a fixing portion, and along the thickness direction of the wall portion, the fixing portion is located on one side of the wall portion; the electrode terminal is arranged on the wall portion, and the electrode terminal is electrically connected to the electrode assembly; the first insulating member is arranged between the electrode terminal and the fixing member to insulate and isolate the electrode terminal and the fixing member; wherein the fixing portion includes a main body area and a thinning area connected to each other, along the thickness direction of the wall portion, the thinning area is farther away from the wall portion than the main body area, the electrode terminal has an assembly portion extending between the thinning area and the wall portion, the projection of the main body area does not overlap with the projection of the assembly portion, and the thinning area is configured to cooperate with the wall portion to limit the movement of the electrode terminal along the thickness direction of the wall portion.

[0005] In the above technical solution, a fixing part is connected to the wall of the shell, and the fixing part has a fixing part located on one side of the wall in the thickness direction of the wall, and the electrode terminal has an assembly part extending between the thinning area of ​​the fixing part and the wall, so that the fixing part and the wall can cooperate to clamp and limit the assembly part of the electrode terminal in the thickness direction of the wall, so as to realize the assembly of the electrode terminal on the wall, wherein a first insulating part is also arranged between the electrode terminal and the fixing part, so that the first insulating part can insulate and isolate the electrode terminal and the fixing part, and the main area of ​​the fixing part is set to a structure that does not overlap with the projection of the assembly part in the thickness direction of the wall, and the projection of the thinning area in the thickness direction of the wall overlaps with at least part of the assembly part, so that the fixing part is a structure that presses the assembly part of the electrode terminal on the wall through the thinning area, and the thinning area is in the thickness direction of the wall. In the thickness direction, the main body area is farther away from the wall portion, so that the distance between the thinning area and the wall portion in the thickness direction of the wall portion is larger, so that the thickness of the first insulating member between the thinning area of ​​the fixing portion and the assembly portion of the electrode terminal in the thickness direction of the wall portion can be increased, so that the thickness of the portion of the first insulating member located between the thinning area and the assembly portion remains unchanged, and when the insulation isolation of the fixing portion and the assembly portion is met, the distance between the fixing portion and the wall portion in the thickness direction of the wall portion can be reduced to optimize the size of the fixing portion in the thickness direction of the wall portion, and the size of the electrode terminal in the thickness direction of the wall portion can be optimized, thereby reducing the space occupied by the electrode terminal and the fixing portion for assembling the electrode terminal in the thickness direction of the wall portion, so as to save the space occupied by the battery cell in the thickness direction of the wall portion, which is beneficial to improving the energy density of the battery cell.

[0006] In some embodiments, the electrode terminal includes a main body portion; the main body portion is electrically connected to the electrode assembly, and the assembly portion is protruded from the outer peripheral surface of the main body portion; wherein the thinning area is located between the main body area and the main body portion, and a portion of the first insulating member is located between the thinning area and the outer peripheral surface of the main body portion.

[0007] In the above technical solution, the electrode terminal is also provided with a main body portion, the assembly portion of the electrode terminal is a structure protruding from the outer peripheral surface of the main body portion, and the thinning area is a structure connected to the side of the main area facing the main body portion, so as to facilitate the extension of the assembly portion to between the thinning areas of the wall portion and the fixed portion, and facilitate the thinning areas of the wall portion and the fixed portion to cooperate to limit the assembly portion.

[0008] In some embodiments, the mounting portion surrounds the outer side of the main body portion.

[0009] In the above technical solution, by setting the assembly part as an annular structure surrounding the outer side of the main body part, any position of the assembly part in the circumferential direction of the main body part can be clamped and restricted by the thinned area of ​​the wall part and the fixing part, so that during the process of assembling the electrode terminal, there is no need to position or rotate the electrode terminal to adjust the angle, which is beneficial to reducing the difficulty of assembling the assembly part of the electrode terminal between the thinned area of ​​the wall part and the fixing part, and is beneficial to improving the stability and reliability of the electrode terminal assembled on the wall part.

[0010] In some embodiments, one of the main body and the first insulating member is provided with a first limiting protrusion, and the other is provided with a first limiting groove, the first limiting protrusion is accommodated in the first limiting groove, and the first limiting groove and the first limiting protrusion are configured to cooperate to limit the rotation of the electrode terminal relative to the first insulating member.

[0011] In the above technical solution, by providing a first limiting protrusion on one of the main body and the first insulating member, and providing a first limiting groove on the other, the first limiting protrusion can be inserted into the first limiting groove to achieve circumferential locking between the main body and the first insulating member, which is beneficial to alleviate the phenomenon that the electrode terminal rotates relative to the first insulating member around the axis extending along the thickness direction of the wall portion. On the one hand, it can improve the assembly accuracy between the electrode terminal and the first insulating member and reduce the assembly difficulty between the electrode terminal and the first insulating member. On the other hand, it can improve the structural stability of the electrode terminal assembled on the wall portion.

[0012] In some embodiments, there are multiple first limiting protrusions, and the multiple first limiting protrusions are arranged at intervals along the circumference of the main body. The first limiting grooves are correspondingly arranged to the first limiting protrusions, and each of the first limiting grooves is used to accommodate one first limiting protrusion.

[0013] In the above technical solution, by providing a plurality of first limiting protrusions, and the plurality of first limiting protrusions are arranged at intervals along the circumference of the main body, each first limiting protrusion is correspondingly inserted into a first limiting groove. The battery cell adopting this structure can further enhance the limiting effect of the circumferential locking between the electrode terminal and the first insulating member, thereby facilitating further alleviating the phenomenon of the electrode terminal rotating relative to the first insulating member around the axis extending along the thickness direction of the wall.

[0014] In some embodiments, the first limiting protrusion is convexly provided on the outer circumferential surface of the main body, and the first insulating member is provided with the first limiting groove.

[0015] In the above technical solution, the first limiting protrusion is a structure protruding from the outer peripheral surface of the main body, and the first limiting groove is a structure arranged on the first insulating member. The battery cell adopting this structure does not need to be grooved on the main body of the electrode terminal, which is beneficial to improving the structural strength of the electrode terminal and the current carrying capacity of the electrode terminal.

[0016] In some embodiments, a dimension of the first limiting protrusion protruding from the outer circumferential surface of the main body is smaller than a dimension of the assembly portion protruding from the outer circumferential surface of the main body.

[0017] In the above technical solution, by setting the size of the first limiting protrusion protruding from the outer circumferential surface of the main body to be smaller than the size of the assembly part protruding from the outer circumferential surface of the main body, it is helpful to alleviate the interference between the first limiting protrusion and the main area of ​​the fixing part, and can save the space occupied by the first limiting protrusion in the radial direction of the main body, so as to alleviate the phenomenon of poor insulation effect caused by the thickness of the part of the first insulating part located between the first limiting protrusion and the fixing part being too small.

[0018] In some embodiments, along the thickness direction of the wall portion, the first limiting protrusion is connected to the assembly portion, and the first limiting protrusion is located on a side of the assembly portion facing the thinning area.

[0019] In the above technical solution, by connecting the first limiting protrusion to the side of the assembly part facing the thinning area in the thickness direction of the wall portion, on the one hand, the difficulty of setting the first limiting groove on the first insulating member can be reduced, and the difficulty of assembling the electrode terminal and the first insulating member can be reduced; on the other hand, the first limiting protrusion can utilize the space between the assembly part and the thinning area in the thickness direction of the wall portion, and there is no need to increase the distance between the fixing part and the wall portion in order to avoid the first limiting protrusion, which is beneficial to saving the space occupied by the fixing part and the wall portion in the thickness direction of the wall portion, so as to optimize the size of the battery cell in the thickness direction of the wall portion.

[0020] In some embodiments, along the thickness direction of the wall portion, the first limiting protrusion is spaced apart from the thinning area.

[0021] In the above technical solution, the first limiting protrusion and the thinning area are arranged as a spaced-apart structure in the thickness direction of the wall portion to reduce the interference between the first limiting protrusion and the fixing portion, and a first insulating member can be arranged between the first limiting protrusion and the fixing portion to reduce the risk of short circuit between the first limiting protrusion and the fixing portion.

[0022] In some embodiments, along the thickness direction of the wall portion, the minimum distance between the first limiting protrusion and the thinning area is L, satisfying that L≥0.5 mm.

[0023] In the above technical solution, by making the dimensions of the first limiting protrusion and the thinning area in the thickness direction of the wall portion greater than or equal to 0.5 mm, the thickness of the portion of the first insulating member located between the first limiting protrusion and the thinning area can be further increased, which is beneficial to further reduce the difficulty of setting the first insulating member between the first limiting protrusion and the thinning area, and can further enhance the effect of the first insulating member in insulating and isolating the thinning area and the electrode terminal.

[0024] In some embodiments, along the thickness direction of the wall portion, the thickness of the main region is D1, and the thickness of the thinned region is D2, satisfying 1>D2 / D1≥1 / 3.

[0025] In the above technical solution, by setting the ratio of the thickness of the thinning zone of the fixing part to the thickness of the main zone of the fixing part to be greater than or equal to one third, the thickness of the thinning zone is made to be more than one third of the thickness of the main zone, so as to alleviate the phenomenon that the manufacturing difficulty of the thinning zone is too great, and the structural strength of the thinning zone can be improved to alleviate the phenomenon that the thinning zone is deformed or fractured due to insufficient structural strength, which is beneficial to improve the stability and reliability of the electrode terminal assembled in cooperation with the wall portion.

[0026] In some embodiments, one of the electrode terminal and the first insulating member is provided with a first limiting protrusion, and the other is provided with a first limiting groove, the first limiting protrusion is accommodated in the first limiting groove, and the first limiting groove and the first limiting protrusion are configured to cooperate to limit the rotation of the electrode terminal relative to the first insulating member.

[0027] In the above technical solution, by providing a first limiting protrusion on one of the electrode terminal and the first insulating member, and providing a first limiting groove on the other, the first limiting protrusion can be inserted into the first limiting groove to achieve circumferential locking between the electrode terminal and the first insulating member, which is beneficial to alleviate the phenomenon that the electrode terminal rotates relative to the first insulating member around the axis extending along the thickness direction of the wall portion. On the one hand, it can improve the assembly accuracy between the electrode terminal and the first insulating member and reduce the assembly difficulty between the electrode terminal and the first insulating member. On the other hand, it can improve the structural stability of the electrode terminal assembled on the wall portion.

[0028] In some embodiments, the fixing member is arranged around the electrode terminal; wherein, one of the thinning area and the first insulating member is provided with a second limiting groove, and the other is provided with a second limiting protrusion, the second limiting protrusion is accommodated in the second limiting groove, and the second limiting protrusion and the second limiting groove are configured to cooperate to limit the rotation of the fixing member relative to the first insulating member.

[0029] In the above technical solution, the fixing member is arranged as a structure arranged around the electrode terminal, and one of the first insulating member and the thinning area of ​​the fixing portion is provided with a second limiting protrusion, and the other is provided with a second limiting groove, so that after the second limiting protrusion is inserted into the second limiting groove, circumferential locking between the fixing member and the first insulating member can be achieved, which is beneficial to alleviate the phenomenon that the fixing member rotates relative to the first insulating member around the axis extending along the thickness direction of the wall portion. On the one hand, it can improve the assembly accuracy between the fixing member and the first insulating member and reduce the assembly difficulty between the fixing member and the first insulating member. On the other hand, it can improve the structural stability and reliability of the fixing member connected to the wall portion.

[0030] In some embodiments, there are a plurality of second limiting grooves, and the plurality of second limiting grooves are arranged at intervals along the circumference of the fixing member. The second limiting protrusions are arranged corresponding to the second limiting grooves, and each second limiting groove is used to accommodate a second limiting protrusion.

[0031] In the above technical solution, by providing a plurality of second limiting grooves, and the plurality of second limiting grooves are arranged at intervals along the circumference of the fixing member, each second limiting groove is used for inserting a second limiting protrusion. The battery cell adopting this structure can further enhance the circumferential locking limiting effect between the fixing member and the first insulating member, thereby facilitating further alleviating the phenomenon that the fixing member rotates relative to the first insulating member around the axis extending along the thickness direction of the wall portion.

[0032] In some embodiments, the thinning area is provided with the second limiting groove, and the first insulating member is provided with the second limiting protrusion.

[0033] In the above technical solution, by setting the second limiting groove on the thinning area and correspondingly setting the second limiting protrusion on the first insulating member, the battery cell adopting this structure is convenient for processing the second limiting groove on the thinning area and assembling the second limiting protrusion of the first insulating member in the second limiting groove, which is beneficial to reducing the manufacturing difficulty of the battery cell; on the other hand, there is no need to protrude the second limiting protrusion on the thinning area, so that the second limiting protrusion does not occupy the space in the thinning area, which is beneficial to alleviate the interference between the second limiting protrusion and the electrode terminal.

[0034] In some embodiments, along the thickness direction of the wall portion, the second limiting groove runs through both sides of the thinning area.

[0035] In the above technical solution, by setting the second limiting groove as a structure that passes through both sides of the thinning area in the thickness direction of the wall portion, on the one hand, the difficulty of setting the second limiting groove on the thinning area can be reduced, and the second limiting protrusion on the first insulating member can be easily assembled into the second limiting groove. On the other hand, the space of the second limiting groove for accommodating the second limiting protrusion can be further increased, which is beneficial to improving the limiting effect between the first insulating member and the fixing member.

[0036] In some embodiments, the fixing member further includes a connecting portion, the connecting portion connecting the wall portion and the fixing portion, and along a thickness direction of the wall portion, the fixing portion and the wall portion are spaced apart.

[0037] In the above technical solution, the fixing member is also provided with a connecting portion, through which the fixing portion and the wall portion are connected, so as to realize a structure in which the fixing portion and the wall portion are spaced apart along the thickness direction of the wall portion, thereby facilitating the fixing portion and the wall portion to cooperate with the assembly portion for clamping the electrode terminal, and reducing the difficulty of connection between the fixing member and the wall portion.

[0038] In some embodiments, the connecting portion includes a first connecting segment and a second connecting segment; the first connecting segment is connected to the wall portion, and the first connecting segment and the fixing portion are arranged at intervals along the thickness direction of the wall portion; the second connecting segment connects the first connecting segment and the main body area; wherein the first connecting segment extends from the second connecting segment in a direction away from the electrode terminal, and the main body area extends from the second connecting segment in a direction close to the electrode terminal.

[0039] In the above technical solution, the connecting portion includes a first connecting section and a second connecting section which are connected to each other, the first connecting section is connected to the wall portion, the second connecting section is connected to the main area of ​​the fixing portion, and the first connecting section and the main area of ​​the fixing portion are respectively structures extending from both sides of the second connecting section in a direction away from the second connecting section, so that the cross-section of the fixing piece is in a "Z" shape. On the one hand, the structure of the fixing piece can be optimized, which is conducive to reducing the difficulty of connecting the fixing piece to the wall portion. On the other hand, it is only necessary to connect the thinning area of ​​the fixing part to the end of the main area away from the second connecting section to achieve the thinning area being able to cooperate with the wall portion to clamp the assembly cavity, and the fixing piece using this structure can enhance the effect and stability of the thinning area pressing the assembly portion against the wall portion.

[0040] In some embodiments, along the thickness direction of the wall portion, a mounting groove is provided on a side of the wall portion facing the fixing portion, and at least a portion of the first connecting section is accommodated in the mounting groove.

[0041] In the above technical solution, an assembly groove for accommodating the first connecting section of the connecting part is provided on the side of the wall portion facing the fixing portion, so that part of the connecting part of the fixing member can be inserted into the assembly groove, which is beneficial to further save the space occupied by the fixing member and the wall portion in the thickness direction of the wall portion.

[0042] In some embodiments, the first connecting section abuts against a bottom surface of the assembly slot, and the first connecting section abuts against a side surface of the assembly slot.

[0043] In the above technical solution, by setting the first connecting section of the connecting part of the fixing piece as a structure that abuts against both the bottom surface and the side surface of the assembly groove, the assembly groove can also play a role in limiting and positioning the first connecting section. On the one hand, it can improve the accuracy of the fixing piece being assembled on the wall portion and reduce the difficulty of connection between the fixing piece and the wall portion. On the other hand, it can further improve the structural stability and reliability of the fixing piece being assembled on the wall portion.

[0044] In some embodiments, the fixing portion is disposed around the electrode terminal.

[0045] In the above technical solution, by setting the fixing portion of the fixing member as an annular structure arranged around the electrode terminal, the fixing portion of the fixing member can cooperate with the wall portion at any position in the circumferential direction to clamp, restrict and assemble the assembly portion of the electrode terminal, so that during the mutual assembly of the fixing member and the electrode terminal, there is no need to position the fixing member or rotate to adjust the angle, which is beneficial to reducing the difficulty of assembling the assembly portion of the electrode terminal between the wall portion and the thinning area of ​​the fixing portion, and is beneficial to improving the stability and reliability of the electrode terminal assembled on the wall portion.

[0046] In some embodiments, at least a portion of the fixing portion is embedded in the first insulating member, and along the thickness direction of the wall portion, a portion of the first insulating member is located on a side of the fixing portion away from the wall portion.

[0047] In the above technical solution, by embedding at least part of the fixing portion of the fixing member in the first insulating member, and part of the first insulating member is located on the side of the fixing member away from the wall portion, the first insulating member is made to be a structure covering at least part of the outer side of the fixing member, thereby being able to further improve the connection strength between the fixing member and the first insulating member, so as to improve the assembly stability and reliability between the fixing member and the first insulating member, thereby reducing the risk of falling off between the first insulating member and the fixing member, which is beneficial to improving the assembly quality of the battery cell.

[0048] In some embodiments, along the thickness direction of the wall portion, the fixing portion is located on a side of the wall portion away from the electrode assembly.

[0049] In the above technical solution, by setting the fixing portion of the fixing member to be located on the side of the wall portion away from the electrode assembly in the thickness direction of the wall portion, the fixing member is a structure connected to the side of the wall portion away from the electrode assembly, and the fixing portion of the fixing member is a structure for assembling the electrode terminal to the wall portion from the side of the wall portion away from the electrode assembly. The battery cell adopting this structure can, on the one hand, reduce the difficulty of connecting the fixing member and the wall portion, and on the other hand, facilitate the assembly of the electrode terminal, which is beneficial to reduce the difficulty of assembling the electrode terminal on the wall portion.

[0050] In some embodiments, the battery cell further includes a second insulating member; along the thickness direction of the wall portion, at least a portion of the second insulating member is disposed between the wall portion and the electrode terminal, and the second insulating member is configured to insulate and isolate the wall portion and the electrode terminal.

[0051] In the above technical solution, the battery cell is also provided with a second insulating member, and at least part of the second insulating member is located between the wall portion and the electrode terminal, so that the wall portion and the electrode terminal can be insulated and isolated by the second insulating member, which is beneficial to reduce the risk of short circuit between the electrode terminal and the wall portion.

[0052] In some embodiments, the wall portion is provided with a terminal hole, and the terminal hole penetrates the wall portion along the thickness direction of the wall portion, a portion of the electrode terminal extends into the terminal hole, and the portion of the electrode terminal extending into the terminal hole is electrically connected to the electrode assembly; wherein the second insulating member is arranged around the terminal hole, and the second insulating member is also configured to seal the gap between the wall portion and the electrode terminal.

[0053] In the above technical solution, a terminal hole for inserting the electrode terminal is also provided on the wall portion so as to facilitate electrical connection between the electrode terminal and the electrode assembly contained in the outer shell. By arranging the second insulating member as a structure arranged around the terminal hole, the second insulating member can also play a role in sealing the gap between the wall portion and the electrode terminal, thereby helping to reduce the risk of leakage of the battery cell at the terminal hole.

[0054] In some embodiments, the fixing member and the wall portion are separately provided; or, the fixing member and the wall portion are integrally formed.

[0055] In the above technical solution, by setting the fixing part and the wall part as a separate structure, it is helpful to reduce the difficulty of setting the fixing part on the wall part, and it is convenient to assemble the assembly part of the electrode terminal between the fixing part of the fixing part and the wall part, so as to reduce the difficulty of assembling the electrode terminal on the wall part. By setting the fixing part and the wall part as an integrally formed structure, the fixing part and the wall part are an integral structure formed by an integral forming process, so as to improve the connection strength and connection stability between the fixing part and the wall part, so as to improve the stability of the assembly part of the fixing part of the fixing part and the wall part for clamping and assembling the electrode assembly, and thus help to improve the reliability of the electrode terminal assembly on the wall part.

[0056] In some embodiments, the outer shell includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the receiving cavity is used to receive the electrode assembly; the end cover closes the opening; wherein the end cover is the wall portion.

[0057] In the above technical solution, by setting the wall portion of the outer shell as the end cover of the outer shell for closing the opening of the shell, the battery cell adopting this structure is convenient for assembling the electrode terminal to the wall portion through the fixing part, which is beneficial to reduce the difficulty of assembling the electrode terminal to the wall portion, and is convenient for electrically connecting the electrode terminal to the electrode assembly, which is beneficial to reduce the difficulty of assembling the electrode terminal and the electrode assembly, thereby effectively reducing the difficulty of assembling the battery cell and improving the production efficiency of the battery cell.

[0058] In some embodiments, the shell includes a shell and an end cover; the shell includes an integrally formed side wall and the wall portion, the side wall is arranged around the wall portion, along the thickness direction of the wall portion, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, the side wall and the wall portion jointly define a accommodating cavity for accommodating the electrode assembly; the end cover closes the opening.

[0059] In the above technical solution, by setting the wall portion of the outer shell as a wall of the shell that is arranged opposite to the end cover in the thickness direction of the wall portion, the battery cell adopting this structure can make the wall portion equipped with the electrode terminal and the fixing member away from the end cover, so that there is no direct connection relationship between the wall portion and the end cover, thereby alleviating the phenomenon that the force generated when the electrode terminal and the fixing member pull or twist the wall portion acts on the end cover, thereby reducing the risk of connection failure between the end cover and the shell, and further helping to reduce the risk of leakage of the battery cell during use.

[0060] In a second aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.

[0061] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] 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.

[0063] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0064] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0065] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0066] Figure 4 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0067] Figure 5 A partial cross-sectional view of a battery cell perpendicular to its length direction provided in some embodiments of the present application;

[0068] Figure 6 for Figure 5 A partial enlarged view of the battery cell at A shown;

[0069] Figure 7 A schematic diagram of assembling a fixing member and an electrode terminal provided in some embodiments of the present application;

[0070] Figure 8 A schematic diagram of the structure of a fixing member provided in some embodiments of the present application;

[0071] Fig. 9 A top view of a fixing member provided in some embodiments of the present application;

[0072] Fig.10 A cross-sectional view of a fixing member provided in some embodiments of the present application;

[0073] Fig.11 for Fig.10 A partial enlarged view of the fixing member at B shown;

[0074] Fig.12 A schematic diagram of the structure of electrode terminals provided in some embodiments of the present application;

[0075] Fig.13 A top view of an electrode terminal provided in some embodiments of the present application;

[0076] Fig.14 A cross-sectional view of an electrode terminal provided in some embodiments of the present application;

[0077] Fig.15 A partial cross-sectional view of a battery cell perpendicular to its thickness direction provided in some embodiments of the present application;

[0078] Fig.16 for Fig.15 A partial enlarged view of the battery cell at position C shown;

[0079] Fig.17 A schematic structural diagram of a first insulating member provided in some embodiments of the present application;

[0080] Fig.18 A cross-sectional view of an electrode terminal provided in some further embodiments of the present application.

[0081] Icon: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-housing; 211-wall; 2111-terminal hole; 2112-assembly groove; 212-housing; 2121-opening; 213-end cover; 22-electrode assembly; 221-ear; 23-fixing member; 231-fixing part; 2311-main body area; 2312-thinning area; 2312a-second limiting groove; 2313-lead-out hole; 232-connecting part; 2321-first Connecting section; 2322-second connecting section; 24-electrode terminal; 241-assembly part; 242-main body; 2421-first limiting protrusion; 243-first material layer; 244-second material layer; 25-first insulating member; 251-first limiting groove; 252-second limiting protrusion; 26-current collecting member; 261-protrusion; 27-second insulating member; 271-first extension part; 28-third insulating member; 281-second extension part; 29-pressure relief mechanism; 200-controller; 300-motor; X-thickness direction of the wall. DETAILED DESCRIPTION

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0086] 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.

[0087] 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.

[0088] The term "plurality" used in the present application refers to two or more (including two).

[0089] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0090] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0091] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0092] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0093] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0094] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0095] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0096] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0097] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0098] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0100] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0101] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0102] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0103] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0104] In some embodiments, the separator is a separator membrane. There may be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability may be selected.

[0105] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0106] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0107] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0108] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0109] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0110] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0111] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0112] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0113] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0114] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0115] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0116] In some embodiments, the electrode assembly is a laminate structure.

[0117] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0118] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0119] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0120] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0121] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0122] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0123] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0124] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0125] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc.

[0126] 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.

[0127] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0128] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0129] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0130] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0131] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The development of battery technology must consider many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters.

[0132] For a general battery cell, the outer shell of the battery cell usually includes a shell and an end cap, wherein the end cap covers the opening of the shell, wherein a terminal hole is provided on the end cap. In order to facilitate the assembly of the battery cell, the electrode terminal is usually inserted into the terminal hole of the end cap, and a connecting portion for abutting against the end cap along the thickness direction of the end cap is convexly provided on the outer peripheral surface of the electrode terminal, and a pressure ring is connected to the end cap, which is arranged around the electrode terminal, and the pressure ring has a fixing portion located on the side of the connecting portion of the electrode terminal away from the end cap in the thickness direction of the end cap, so that the connecting portion of the electrode terminal is located between the end cap and the fixing portion of the pressure ring in the thickness direction of the end cap, so that the pressure ring can press the electrode terminal onto the end cap through the fixing portion after being connected to the end cap, so as to realize the assembly of the electrode terminal on the end cap. At the same time, in order to reduce the risk of short circuit between the electrode terminal and the end cap, an insulating ring is usually provided between the pressure ring and the electrode terminal to realize the short circuit between the electrode terminal and the end cap. Insulation isolation is currently provided between the electrode terminal and the pressure ring. However, in order to reduce the risk of short circuit between the pressure ring and the electrode terminal, the battery cell of this structure needs to ensure the thickness of the portion of the insulating ring located between the fixing portion of the pressure ring and the connecting portion of the electrode terminal in the thickness direction of the end cap. As a result, the spacing between the fixing portion of the pressure ring and the connecting portion of the electrode terminal in the thickness direction of the end cap is relatively large, so that the assembly gap between the fixing portion and the end cap for assembling the connecting portion of the electrode terminal is relatively large in the thickness direction of the end cap, resulting in the pressure ring occupying more space in the thickness direction of the end cap. In addition, in order to realize that the electrode terminal passes through the pressure ring along the thickness direction of the end cap and is connected to the current collecting component of the battery, the size of the electrode terminal in the thickness direction of the end cap needs to be enlarged, resulting in the electrode terminal occupying a larger space in the thickness direction of the end cap, thereby causing the battery cell to occupy more space, which is not conducive to improving the energy density of the battery cell.

[0133] Based on the above considerations, in order to solve the problem of a large amount of space occupied by a battery cell, an embodiment of the present application provides a battery cell, the battery cell comprising a housing, an electrode assembly, a fixing member, an electrode terminal and a first insulating member. The housing has a wall portion. The electrode assembly is accommodated in the housing. The fixing member is connected to the wall portion, and the fixing member includes a fixing portion, and the fixing portion is located on one side of the wall portion along the thickness direction of the wall portion. The electrode terminal is disposed on the wall portion, and the electrode terminal is electrically connected to the electrode assembly. The first insulating member is disposed between the electrode terminal and the fixing member to insulate and isolate the electrode terminal and the fixing member. The fixing portion includes a main body area and a thinning area that are interconnected, and along the thickness direction of the wall portion, the thinning area is farther away from the wall portion than the main body area, and the electrode terminal has an assembly portion extending between the thinning area and the wall portion, and the projection of the main body area does not overlap with the projection of the assembly portion, and the thinning area is configured to cooperate with the wall portion to limit the movement of the electrode terminal along the thickness direction of the wall portion.

[0134] In a battery cell of this structure, a fixing part is connected to the wall of the shell, and the fixing part has a fixing part located on one side of the wall in the thickness direction of the wall, and the electrode terminal has an assembly part extending between the thinning area of ​​the fixing part and the wall, so that the fixing part and the wall can cooperate to clamp and limit the assembly part of the electrode terminal in the thickness direction of the wall, so as to realize the assembly of the electrode terminal on the wall, wherein a first insulating part is also arranged between the electrode terminal and the fixing part, so that the first insulating part can insulate and isolate the electrode terminal and the fixing part, and the main area of ​​the fixing part is set to a structure that does not overlap with the projection of the assembly part in the thickness direction of the wall, and the projection of the thinning area in the thickness direction of the wall overlaps with at least part of the assembly part, so that the fixing part is a structure that presses the assembly part of the electrode terminal on the wall through the thinning area, and the thinning area is in the wall. In the thickness direction, the thinning area is farther away from the wall portion than the main body area, so that the distance between the thinning area and the wall portion in the thickness direction of the wall portion is larger, so that the thickness of the first insulating member between the thinning area of ​​the fixing portion and the assembly portion of the electrode terminal in the thickness direction of the wall portion can be increased, so that the thickness of the portion of the first insulating member located between the thinning area and the assembly portion remains unchanged, and when the insulation isolation of the fixing portion and the assembly portion is satisfied, the spacing between the fixing portion and the wall portion in the thickness direction of the wall portion can be reduced to optimize the size of the fixing portion in the thickness direction of the wall portion, and the size of the electrode terminal in the thickness direction of the wall portion can be optimized, thereby reducing the space occupied by the electrode terminal and the fixing portion for assembling the electrode terminal in the thickness direction of the wall portion, so as to save the space occupied by the battery cell in the thickness direction of the wall portion, which is beneficial to improving the energy density of the battery cell.

[0135] The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is helpful to alleviate the problem of the battery cells occupying more space and improve the energy density of the battery cells.

[0136] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, 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, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0137] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0138] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 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, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source or a power source for the vehicle 1000, etc. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.

[0139] In some embodiments of the present application, the battery 100 can not only serve as an operating power source or a use 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.

[0140] Please refer to Figure 2 and Figure 3 , Figure 2 The structure explosion diagram of the battery 100 provided in some embodiments of the present application is shown in FIG. Figure 3 The schematic diagram of the structure of the battery cell 20 provided in some embodiments of the present application is as follows: The battery 100 comprises a box body 10 and a battery cell 20 , and the battery cell 20 is used to be accommodated in the box body 10 .

[0141] The box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 may also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0142] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube. Figure 2 In the embodiment, the box body 10 is in the shape of a rectangular parallelepiped.

[0143] In the battery 100, the battery cell 20 disposed in the box 10 may be one or more. When there are more than one battery cell 20 disposed in the box 10, the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 may be accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules may be connected in series, in parallel, or in mixed connection to form a whole, and then the whole may be accommodated in the box 10.

[0144] In some embodiments, the battery 100 may further include other structures, for example, the battery 100 may further include a busbar component (not shown in the figure), which is used to connect multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20. The busbar component plays the role of connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and the material of the busbar component may be copper, iron, aluminum, steel, aluminum alloy, etc.

[0145] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in a rectangular parallelepiped, a cylinder, a prism or other shapes. For example, Figure 3 In the figure, the battery cell 20 is a rectangular parallelepiped structure.

[0146] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , Figure 4 This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 5 A partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application perpendicular to its length direction, Figure 6 for Figure 5 The partial enlarged view of the battery cell 20 at A shown in FIG. Figure 7 This is a schematic diagram of assembling a fixing member 23 and an electrode terminal 24 provided in some embodiments of the present application. Figure 8 A schematic diagram of the structure of a fixing member 23 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a shell 21, an electrode assembly 22, a fixing member 23, an electrode terminal 24 and a first insulating member 25. The shell 21 has a wall portion 211. The electrode assembly 22 is accommodated in the shell 21. The fixing member 23 is connected to the wall portion 211, and the fixing member 23 includes a fixing portion 231, and the fixing portion 231 is located on one side of the wall portion 211 along the thickness direction X of the wall portion. The electrode terminal 24 is disposed on the wall portion 211, and the electrode terminal 24 is electrically connected to the electrode assembly 22. The first insulating member 25 is disposed between the electrode terminal 24 and the fixing member 23 to insulate and isolate the electrode terminal 24 and the fixing member 23. The fixing portion 231 includes a main body area 2311 and a thinning area 2312 which are interconnected. Along the thickness direction X of the wall, the thinning area 2312 is farther away from the wall 211 than the main body area 2311. The electrode terminal 24 has an assembly portion 241 extending between the thinning area 2312 and the wall 211. The projection of the main body area 2311 does not overlap with the projection of the assembly portion 241. The thinning area 2312 is configured to cooperate with the wall 211 to limit the movement of the electrode terminal 24 along the thickness direction X of the wall.

[0147] The housing 21 can also be used to contain electrolyte, such as electrolyte. The housing 21 can be in various structural forms. The housing 21 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0148] In some embodiments, the housing 21 may include a shell 212 and an end cap 213, wherein a accommodating cavity is formed inside the shell 212, and the accommodating cavity has an opening 2121, that is, the shell 212 is a hollow structure with one end open, and the end cap 213 covers the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0149] Optionally, the wall portion 211 for assembling the fixing member 23 and the electrode terminal 24 may be an end cap 213 or one of the multiple walls of the housing 212. Figure 3 and Figure 4In the embodiment, the wall portion 211 is the end cap 213 of the housing 21, so that the thickness direction X of the wall portion is the height direction of the battery cell 20. Of course, in other embodiments, the wall portion 211 may also be the bottom wall of the housing 212 disposed opposite to the end cap 213 in the thickness direction X of the wall portion, or the side wall adjacent to and abutting against the end cap 213.

[0150] When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 212 first, and the housing 212 may be filled with electrolyte. The end cap 213 may then be placed on the opening 2121 of the housing 212 to seal the opening 2121 of the housing 212 .

[0151] The shell 212 can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell 212 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, the shell 212 can be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the shell 212 can be a cuboid structure. Of course, the end cap 213 can also be in various structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 3 and Figure 4 In the embodiment, the housing 212 is a rectangular parallelepiped structure.

[0152] It is understandable that the outer shell 21 is not limited to the above structure, and the outer shell 21 may also be other structures. For example, the outer shell 21 includes a shell body 212 and two end caps 213. The shell body 212 is a hollow structure with openings 2121 on opposite sides. One end cap 213 corresponds to an opening 2121 of the shell body 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0153] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. The structure of the electrode assembly 22 can be of various types. For example, the electrode assembly 22 can be a wound structure formed by winding a positive electrode sheet, an isolation member, and a negative electrode sheet, or a stacked structure formed by stacking a positive electrode sheet, an isolation member, and a negative electrode sheet.

[0154] Exemplarily, the isolation member is an isolation membrane, and the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0155] Among them, the electrode assembly 22 is formed with a pole ear 221 at one end close to the wall portion 211 in the thickness direction X of the wall portion. The pole ear 221 is used to input or output the positive electrode or negative electrode of the electrode assembly 22. The pole ear 221 is used to connect to the electrode terminal 24 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 24. It should be noted that the pole ear 221 of the electrode assembly 22 is a component formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer or a component formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer. If the pole ear 221 is used to output the positive electrode of the electrode assembly 22, the pole ear 221 is a component formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the pole ear 221 is used to output the negative electrode of the electrode assembly 22, the pole ear 221 is a component formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer.

[0156] Exemplarily, the material of the tab 221 may be copper or aluminum.

[0157] Optionally, the number of electrode assemblies 22 contained in the housing 21 may be one or more. Figure 4 In the embodiment, the outer shell 21 of the battery cell 20 is provided with two electrode assemblies 22, and the two electrode assemblies 22 are stacked along the thickness direction thereof, that is, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the electrode assemblies 22 accommodated in the outer shell 21 can be one, three, four, five, six, seven or eight, etc.

[0158] The electrode terminal 24 serves to output or input the electric energy of the battery cell 20 . One end of the electrode terminal 24 is used to connect to the tab 221 of the electrode assembly 22 , and the other end is used to connect to the busbar component to realize the input or output of the electric energy of the battery cell 20 .

[0159] Exemplarily, the electrode terminal 24 may be made of a variety of materials, for example, the electrode terminal 24 may be made of copper, iron, aluminum, steel, aluminum alloy, etc. Of course, in some embodiments, the electrode terminal 24 may also be a composite material, that is, the electrode terminal 24 is formed by composite connection of two metals of different materials, for example, by hot pressing or cold pressing.

[0160] Among them, a terminal hole 2111 is set on the wall portion 211, and the terminal hole 2111 passes through both sides of the wall portion 211 along the thickness direction X of the wall portion. The electrode terminal 24 is inserted into the terminal hole 2111 along the thickness direction X of the wall portion, so that part of the electrode terminal 24 is located in the terminal hole 2111, so that the electrode terminal 24 can be connected to the electrode assembly 22 located inside the outer shell 21, and can also be connected to the busbar component located outside the outer shell 21, so as to realize the input or output of electrical energy of the battery cell 20.

[0161] Optionally, the electrode terminal 24 may be directly connected to the pole ear 221 of the electrode assembly 22, such as by welding or abutment, or may be indirectly connected to the pole ear 221 of the electrode assembly 22 through other components. Similarly, the connection structure between the electrode terminal 24 and the busbar component may be various, such as welding, abutment or clamping.

[0162] In some embodiments, see Figure 4 As shown, the battery cell 20 may further include a current collecting member 26 disposed in the housing 21 , and the current collecting member 26 connects the electrode terminal 24 and the tab 221 of the electrode assembly 22 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 24 .

[0163] Among them, the current collecting component 26 is provided with a protrusion 261 on the side facing the wall portion 211 in the thickness direction X of the wall portion, and the protrusion 261 is inserted into the terminal hole 2111 along the thickness direction X of the wall portion, and the protrusion 261 is used to be connected to the electrode terminal 24 to electrically connect the current collecting component 26 and the electrode terminal 24. The current collecting component 26 with this structure is conducive to reducing the difficulty of connecting the current collecting component 26 and the electrode terminal 24.

[0164] Exemplarily, the protrusion 261 of the current collecting member 26 is welded to the electrode terminal 24, and the current collecting member 26 is welded to the tab 221 of the electrode assembly 22. Of course, in other embodiments, the current collecting member 26 may also be in a structure such as abutting against the electrode terminal 24, and similarly, the current collecting member 26 may also be in a structure such as abutting against the tab 221 of the electrode assembly 22.

[0165] In the embodiment of the present application, the fixing member 23 serves to fix the electrode terminal 24 on the wall portion 211 , and the first insulating member 25 serves to insulate and isolate the fixing member 23 and the electrode terminal 24 to achieve insulation isolation between the electrode terminal 24 and the fixing member 23 .

[0166] The fixing member 23 is connected to the wall portion 211, that is, the fixing member 23 is fastened to the wall portion 211. The fixing member 23 and the wall portion 211 may be an integrally formed structure or a separately arranged structure. For example, Figure 5 and Figure 6 In the embodiment, the fixing member 23 and the wall portion 211 are of a split structure, and the fixing member 23 is welded to the wall portion 211. Of course, in other embodiments, the fixing member 23 may also be bolted, clamped or bonded to the wall portion 211.

[0167] The fixing portion 231 of the fixing member 23 refers to a portion of the fixing member 23 that is located at one side of the wall portion 211 in the thickness direction X of the wall portion and is spaced apart from the wall portion 211 .

[0168] Reference Figure 7 and Figure 8 , and please refer to Fig. 9 , Fig.10 and Fig.11 , Fig. 9 A top view of a fixing member 23 provided in some embodiments of the present application, Fig.10 A cross-sectional view of a fixing member 23 provided in some embodiments of the present application, Fig.11 for Fig.10 The enlarged partial view of the B portion of the fixing member 23 is shown. Along the thickness direction X of the wall portion, the thinning area 2312 is farther away from the wall portion 211 than the main area 2311, that is, the thinning area 2312 of the fixing portion 231 is a structure formed on the side of the fixing portion 231 facing the wall portion 211, so that a local area of ​​the side of the fixing portion 231 facing the wall portion 211 is thinned, that is, the side of the fixing portion 231 facing the wall portion 211 is provided with a thinning groove, and the area of ​​the fixing portion 231 provided with the thinning groove is the thinning area 2312, that is, the bottom wall of the thinning groove is the thinning area 2312, and the area of ​​the fixing portion 231 that is not provided with the thinning groove and is thinned is the main area 2311.

[0169] The electrode terminal 24 has an assembly portion 241 extending between the thinning area 2312 and the wall portion 211, that is, in the thickness direction X of the wall portion, the assembly portion 241 of the electrode terminal 24 is located between the thinning area 2312 of the fixing portion 231 and the wall portion 211, so that the thinning area 2312 and the wall portion 211 are respectively located on both sides of the assembly portion 241, so that the projection of the thinning area 2312 of the fixing portion 231 in the thickness direction X of the wall portion at least partially overlaps with the projection of the assembly portion 241, and the projection of the wall portion 211 in the thickness direction X of the wall portion at least partially overlaps with the projection of the assembly portion 241.

[0170] The projection of the main body area 2311 does not overlap with the projection of the assembly part 241, that is, the main body area 2311 of the fixing part 231 and the assembly part 241 of the electrode terminal 24 are arranged in a spaced-apart structure in a direction perpendicular to the thickness direction X of the wall, so that the main body area 2311 of the fixing part 231 and the assembly part 241 of the electrode terminal 24 do not cover each other in the thickness direction X of the wall.

[0171] The thinning zone 2312 is configured to cooperate with the wall portion 211 to limit the movement of the electrode terminal 24 along the thickness direction X of the wall portion, that is, the thinning zone 2312 and the wall portion 211 are used to cooperate with the assembly portion 241 that clamps the electrode terminal 24 in the thickness direction X of the wall portion to fasten and limit the electrode terminal 24 on the wall portion 211.

[0172] It should be noted that the thinning area 2312 and the assembly portion 241 may be in direct or indirect contact. Similarly, the wall portion 211 and the assembly portion 241 may be in direct or indirect contact. That is, the thinning area 2312 and the wall portion 211 may be in a structure that directly clamps and restricts the assembly portion 241, or may be in a structure that indirectly clamps and restricts the assembly portion 241 through other components. For example, see Figure 5 and Figure 6 As shown, the battery cell 20 is provided with a first insulating member 25 and a second insulating member 27. The first insulating member 25 is arranged between the fixing member 23 and the electrode terminal 24 to insulate and isolate the fixing member 23 and the electrode terminal 24. The second insulating member 27 is arranged between the wall portion 211 and the electrode terminal 24 to insulate and isolate the wall portion 211 and the electrode terminal 24, so that the thinning area 2312 of the fixing portion 231 of the fixing member 23 is a structure that contacts the assembly portion 241 through the first insulating member 25, and the wall portion 211 is a structure that contacts the assembly portion 241 through the second insulating member 27, so that the thinning area 2312 and the wall portion 211 are structures that indirectly clamp and limit the assembly portion 241 through the first insulating member 25 and the second insulating member 27, so that the electrode terminal 24 can be insulated and installed on the wall portion 211, that is, no electrical connection is formed between the electrode terminal 24 and the wall portion 211.

[0173] The first insulating member 25 serves to insulate and isolate the fixing member 23 and the electrode terminal 24 . The first insulating member 25 may be made of various materials, such as rubber, silicone or plastic.

[0174] See also Figure 5 and Figure 6 As shown, along the thickness direction X of the wall portion, part of the second insulating member 27 is arranged between the wall portion 211 and the electrode terminal 24 to achieve the insulation isolation of the wall portion 211 and the electrode terminal 24 by the second insulating member 27, and the second insulating member 27 is a structure arranged around the terminal hole 2111, so that the second insulating member 27 is also configured to seal the gap between the electrode terminal 24 and the wall portion 211.

[0175] Exemplarily, the material of the second insulating member 27 may be rubber, silicone or plastic.

[0176] In some embodiments, the battery cell 20 may further include a third insulating member 28, which is disposed on a side of the wall 211 facing the electrode assembly 22 along the thickness direction X of the wall, and a portion of the third insulating member 28 is located between the current collecting member 26 and the wall 211 to insulate and isolate the current collecting member 26 and the wall 211.

[0177] Exemplarily, the third insulating member 28 may be made of rubber, silicone or plastic.

[0178] Alternatively, see Figure 5 and Figure 6 As shown, the second insulating member 27 has a first extension portion 271 extending along the thickness direction X of the wall portion to the terminal hole 2111, and the third insulating member 28 has a second extension portion 281 extending along the thickness direction X of the wall portion to the terminal hole 2111. The second extension portion 281 and the first extension portion 271 abut against each other along the thickness direction X of the wall portion, and the second extension portion 281 and the first extension portion 271 are both annular structures extending along the circumferential direction of the hole wall surface of the terminal hole 2111. The second extension portion 281 and the first extension portion 271 are configured to cooperate with the hole of the insulated isolation electrode terminal 24 and the terminal hole 2111. The wall surface and the protrusion 261 of the current collecting component 26 and the hole wall surface of the terminal hole 2111, so that after the protrusion 261 of the current collecting component 26 is connected to the electrode terminal 24, the first extension portion 271 is located between the protrusion 261 and the hole wall surface of the terminal hole 2111 and the electrode terminal 24 and the hole wall surface of the terminal hole 2111, and the second extension portion 281 is located between the protrusion 261 and the hole wall surface of the terminal hole 2111 and the electrode terminal 24 and the hole wall surface of the terminal hole 2111, so as to insulate and isolate the protrusion 261 and the hole wall surface of the terminal hole 2111 and the electrode terminal 24 and the hole wall surface of the terminal hole 2111.

[0179] exist Figure 3 and Figure 4 In the figure, the battery cell 20 includes two electrode terminals 24 and two current collecting components 26, the two electrode terminals 24 are arranged at intervals on the wall 211, and the two current collecting components 26 are arranged at intervals in the shell 21, and correspondingly, each electrode assembly 22 has two pole ears 221, the two pole ears 221 are arranged at intervals, and the polarities of the two pole ears 221 are opposite, and the two electrode terminals 24 are electrically connected to the two pole ears 221 of the electrode assembly 22 through the two current collecting components 26, so as to realize the input or output of the positive and negative electrodes of the battery cell 20, that is, the two electrode terminals 24 are respectively used to output or input the positive and negative electrodes of the battery cell 20, and correspondingly, the two pole ears 221 are the positive pole ear 221 and the negative pole ear 221 of the electrode assembly 22.

[0180] Among them, the battery cell 20 includes two fixing parts 23, two first insulating parts 25 and two second insulating parts 27. The fixing parts 23, the first insulating parts 25 and the second insulating parts 27 are arranged one by one with the electrode terminals 24. Each electrode terminal 24 is assembled on the wall 211 through a fixing part 23. A first insulating part 25 is arranged between each electrode terminal 24 and a fixing part 23, and a second insulating part 27 is arranged between each electrode terminal 24 and the wall 211.

[0181] Optionally, both electrode terminals 24 are insulated and mounted on the wall 211, and each electrode terminal 24 is electrically connected to a tab 221 of the electrode assembly 22 to output the positive and negative electrodes of the battery cell 20. Of course, in other embodiments, the two electrode terminals 24 can also be mounted on different walls of the housing 21.

[0182] In some embodiments, see Figure 3 and Figure 4 As shown, the battery cell 20 may further include a pressure relief mechanism 29 , which is disposed on the housing 21 and is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0183] The pressure relief mechanism 29 may be disposed on the end cover 213 of the housing 21, or may be disposed on the shell 212 of the housing 21. Figure 4 In the embodiment, the pressure relief mechanism 29 is disposed on the end cover 213 of the housing 21 .

[0184] Optionally, the pressure relief mechanism 29 and the housing 21 may be an integrally formed structure or a separately set structure. If the pressure relief mechanism 29 and the housing 21 are a separate structure, the pressure relief mechanism 29 may be connected to the housing 21 by welding or the like, and correspondingly, the pressure relief mechanism 29 may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve; if the pressure relief mechanism 29 and the housing 21 are an integrally formed structure, the pressure relief mechanism 29 is an area on the housing 21 where a weak structure is formed, for example, an area on the housing 21 where a notch groove is set.

[0185] In this embodiment, a fixing member 23 is connected to the wall portion 211 of the housing 21, and the fixing member 23 has a fixing portion 231 located on one side of the wall portion 211 in the thickness direction X of the wall portion, and the electrode terminal 24 has an assembly portion 241 extending between the thinning area 2312 of the fixing portion 231 and the wall portion 211, so that the fixing portion 231 and the wall portion 211 can cooperate to clamp and restrict the assembly portion 241 of the electrode terminal 24 in the thickness direction X of the wall portion, so as to realize the assembly of the electrode terminal 24 on the wall portion 211, wherein the electrode terminal 24 4 and the fixing member 23, so that the first insulating member 25 can insulate and isolate the electrode terminal 24 and the fixing member 23, by setting the main area 2311 of the fixing portion 231 to a structure that does not overlap with the projection of the assembly portion 241 in the thickness direction X of the wall, and the projection of the thinning area 2312 in the thickness direction X of the wall overlaps with at least part of the assembly portion 241, so that the fixing portion 231 is a structure that presses the assembly portion 241 of the electrode terminal 24 on the wall 211 through the thinning area 2312, The thinning area 2312 is further away from the wall 211 than the main area 2311 in the thickness direction X of the wall, so that the distance between the thinning area 2312 and the wall 211 in the thickness direction X of the wall is larger, so that the thickness of the first insulating member 25 located between the thinning area 2312 of the fixing portion 231 and the assembly portion 241 of the electrode terminal 24 in the thickness direction X of the wall can be increased, so that the thickness of the portion of the first insulating member 25 located between the thinning area 2312 and the assembly portion 241 remains unchanged, and the insulation isolation of the fixing portion 231 is satisfied. In the case of the assembly portion 241, the distance between the fixing portion 231 and the wall portion 211 in the thickness direction X of the wall portion can be reduced to optimize the size of the fixing member 23 in the thickness direction X of the wall portion, and the size of the electrode terminal 24 in the thickness direction X of the wall portion can be optimized, thereby reducing the space occupied by the electrode terminal 24 and the fixing member 23 for assembling the electrode terminal 24 in the thickness direction X of the wall portion, thereby saving the space occupied by the battery cell 20 in the thickness direction X of the wall portion, which is beneficial to improving the energy density of the battery cell 20.

[0186] According to some embodiments of the present application, referring to Figure 6 and Figure 7 , and please refer to Fig.12 , Fig.12 Schematic diagram of the structure of the electrode terminal 24 provided in some embodiments of the present application. The electrode terminal 24 may also include a body portion 242. The body portion 242 is electrically connected to the electrode assembly 22, and the assembly portion 241 is convexly disposed on the outer peripheral surface of the body portion 242. The thinning area 2312 is located between the main body area 2311 and the body portion 242, and a portion of the first insulating member 25 is located between the thinning area 2312 and the outer peripheral surface of the body portion 242.

[0187] Among them, the main body 242 extends along the thickness direction X of the wall to the terminal hole 2111 of the wall 211, and one end of the main body 242 close to the electrode assembly 22 is connected to the protrusion 261 of the collecting component 26 to be electrically connected to the electrode assembly 22 through the collecting component 26, and the end of the main body 242 away from the electrode assembly 22 is used to be connected to the collecting component.

[0188] The assembly portion 241 is protruding from the outer circumference of the main body 242 , that is, the assembly portion 241 of the electrode terminal 24 is a structure connected to the outer circumference of the main body 242 and extends along the radial direction of the main body 242 , so that the assembly portion 241 extends between the thinning area 2312 and the wall portion 211 .

[0189] It should be noted that, in other embodiments, the electrode terminal 24 may not be provided with the assembly portion 241. It is only necessary to lower the height of the main body portion 242 so that the outer peripheral surface of the main body portion 242 is located between the thinning area 2312 of the fixing portion 231 and the wall portion 211 to achieve the thinning area 2312 of the fixing portion 231 and the wall portion 211 to clamp and limit the part of the main body portion 242.

[0190] The thinning zone 2312 is located between the main body zone 2311 and the main body portion 242, and a portion of the first insulating member 25 is located between the thinning zone 2312 and the outer peripheral surface of the main body portion 242. That is, the thinning zone 2312 is connected to the side of the main body zone 2311 facing the main body portion 242 in the radial direction of the main body portion 242, and a portion of the first insulating member 25 is arranged between the thinning zone 2312 and the main body portion 242 to insulate and isolate the thinning zone 2312 and the main body portion 242.

[0191] Exemplarily, the fixing portion 231 is an annular structure, and the fixing portion 231 surrounds the outer side of the main body portion 242, so that the fixing portion 231 defines a lead-out hole 2313, and the main body portion 242 of the electrode terminal 24 is penetrated in the lead-out hole 2313 along the thickness direction X of the wall portion, and extends out of the side of the fixing portion 231 away from the wall portion 211, and correspondingly, the thinning area 2312 is connected to the inner circumferential surface of the main body area 2311, and a portion of the first insulating member 25 is accommodated between the inner circumferential surface of the thinning area 2312 and the outer circumferential surface of the main body portion 242.

[0192] In the present embodiment, the electrode terminal 24 is also provided with a main body portion 242, the assembly portion 241 of the electrode terminal 24 is a structure protruding from the outer peripheral surface of the main body portion 242, and the thinning area 2312 is a structure connected to the side of the main body area 2311 facing the main body portion 242, so as to facilitate the extension of the assembly portion 241 to between the thinning area 2312 of the wall portion 211 and the fixing portion 231, and facilitate the thinning area 2312 of the wall portion 211 and the fixing portion 231 to cooperate with the limiting assembly portion 241.

[0193] According to some embodiments of the present application, referring to Figure 7 and Fig.12 , and please refer to Fig.13 and Fig.14 , Fig.13 A top view of an electrode terminal 24 provided in some embodiments of the present application, Fig.14 The cross-sectional view of the electrode terminal 24 provided in some embodiments of the present application. The assembly portion 241 surrounds the outer side of the main body portion 242.

[0194] The assembly portion 241 surrounds the outside of the main body portion 242, that is, the assembly portion 241 is an annular structure and is disposed around the outer circumference of the main body portion 242. Of course, in other embodiments, the assembly portion 241 may also be a plurality of convex hull structures disposed on the outer circumference of the main body portion 242, and the plurality of convex hull structures are arranged at intervals along the circumference of the main body portion 242.

[0195] In this embodiment, by setting the assembly portion 241 as an annular structure surrounding the outer side of the main body portion 242, the assembly portion 241 can be clamped and restricted by the wall portion 211 and the thinned area 2312 of the fixing portion 231 at any circumferential position of the main body portion 242, so that during the assembly of the electrode terminal 24, there is no need to position or rotate the electrode terminal 24 to adjust the angle, which helps to reduce the difficulty of assembling the assembly portion 241 of the electrode terminal 24 between the wall portion 211 and the thinned area 2312 of the fixing portion 231, and helps to improve the stability and reliability of the electrode terminal 24 assembled on the wall portion 211.

[0196] According to some embodiments of the present application, referring to Fig.12 , Fig.13 and Fig.14 , and please refer to Fig.15 , Fig.16 and Fig.17 , Fig.15 A partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application perpendicular to its thickness direction, Fig.16 for Fig.15 The partial enlarged view of the battery cell 20 at C is shown. Fig.17 A schematic diagram of the structure of the first insulating member 25 provided in some embodiments of the present application. One of the body portion 242 and the first insulating member 25 is provided with a first limiting protrusion 2421, and the other is provided with a first limiting groove 251, the first limiting protrusion 2421 is accommodated in the first limiting groove 251, and the first limiting groove 251 and the first limiting protrusion 2421 are configured to cooperate to limit the rotation of the electrode terminal 24 relative to the first insulating member 25.

[0197] Among them, the first limiting groove 251 and the first limiting protrusion 2421 are configured to cooperate to limit the rotation of the electrode terminal 24 relative to the first insulating member 25, that is, after the first limiting protrusion 2421 is inserted into the first limiting groove 251, circumferential locking between the electrode terminal 24 and the first insulating member 25 can be achieved to limit the rotation of the electrode terminal 24 relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall.

[0198] For example, in Fig.12 , Fig.16 and Fig.17 In the embodiment, the first limiting protrusion 2421 is convexly provided on the outer circumference of the body portion 242 of the electrode terminal 24, and correspondingly, the first limiting groove 251 is provided on the inner circumference of the first insulating member 25. Of course, in other embodiments, the first limiting groove 251 may be provided on the outer circumference of the body portion 242, and correspondingly, the first limiting protrusion 2421 is convexly provided on the inner circumference of the first insulating member 25.

[0199] In this embodiment, by providing a first limiting protrusion 2421 on one of the main body 242 and the first insulating member 25, and providing a first limiting groove 251 on the other, the first limiting protrusion 2421 can be inserted into the first limiting groove 251 to achieve circumferential locking between the main body 242 and the first insulating member 25, which is beneficial to alleviate the phenomenon that the electrode terminal 24 rotates relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall. On the one hand, it can improve the assembly accuracy between the electrode terminal 24 and the first insulating member 25 and reduce the assembly difficulty between the electrode terminal 24 and the first insulating member 25. On the other hand, it can improve the structural stability of the electrode terminal 24 assembled on the wall 211.

[0200] In some embodiments, see Fig.12 and Fig.13 as well as Fig.17 As shown, there are multiple first limiting protrusions 2421, and the multiple first limiting protrusions 2421 are arranged at intervals along the circumference of the main body 242, and the first limiting grooves 251 are correspondingly provided to the first limiting protrusions 2421, and each first limiting groove 251 is used to accommodate a first limiting protrusion 2421.

[0201] Exemplarily, a plurality of first limiting protrusions 2421 are convexly provided on the outer circumferential surface of the main body 242, and the plurality of first limiting protrusions 2421 are arranged at intervals along the circumference of the main body 242. Correspondingly, a plurality of first limiting grooves 251 are provided on the inner circumferential surface of the first insulating member 25, and the plurality of first limiting grooves 251 are arranged around the main body 242 so that each first limiting protrusion 2421 can be inserted into a first limiting groove 251.

[0202] Exemplarily, six first limiting protrusions 2421 are convexly provided on the outer circumferential surface of the main body 242, and correspondingly, six first limiting grooves 251 are provided on the inner circumferential surface of the first insulating member 25. Of course, in other embodiments, the number of the first limiting protrusions 2421 and the first limiting grooves 251 can also be two, three, four, five or seven, etc.

[0203] In this embodiment, by providing a plurality of first limiting protrusions 2421, and the plurality of first limiting protrusions 2421 are arranged at intervals along the circumference of the main body 242, each first limiting protrusion 2421 is correspondingly inserted into a first limiting groove 251. The battery cell 20 adopting this structure can further enhance the limiting effect of the circumferential locking between the electrode terminal 24 and the first insulating member 25, thereby facilitating further alleviating the phenomenon of the electrode terminal 24 rotating relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall.

[0204] In some embodiments, see Fig.12 , Fig.14 , Fig.16 and Fig.17 As shown, a first limiting protrusion 2421 is convexly provided on the outer circumferential surface of the main body 242 , and a first limiting groove 251 is provided on the first insulating member 25 .

[0205] The first limiting protrusion 2421 is convexly disposed on the outer circumference of the main body 242 , and the first limiting groove 251 is disposed on the inner circumference of the first insulating member 25 .

[0206] In this embodiment, the first limiting protrusion 2421 is a structure protruding from the outer peripheral surface of the main body 242, and the first limiting groove 251 is a structure arranged on the first insulating member 25. The battery cell 20 adopting this structure does not need to be grooved on the main body 242 of the electrode terminal 24, which is beneficial to improving the structural strength of the electrode terminal 24 and improving the current carrying capacity of the electrode terminal 24.

[0207] In some embodiments, see Fig.12 , Fig.13 , Fig.14 and Fig.16 As shown, the dimension of the first limiting protrusion 2421 protruding from the outer circumference of the body part 242 is smaller than the dimension of the assembly part 241 protruding from the outer circumference of the body part 242. In other words, the length of the first limiting protrusion 2421 protruding in the radial direction of the body part 242 is smaller than the length of the assembly part 241 protruding in the radial direction of the body part 242, so that the projection of the first limiting protrusion 2421 in the thickness direction X of the wall part is located between the outer circumference of the body part 242 and the outer circumference of the assembly part 241.

[0208] In this embodiment, by setting the dimension of the first limiting protrusion 2421 protruding from the outer circumferential surface of the main body 242 to be smaller than the dimension of the assembly portion 241 protruding from the outer circumferential surface of the main body 242, it is helpful to alleviate the interference between the first limiting protrusion 2421 and the main area 2311 of the fixing portion 231, and can save the space occupied by the first limiting protrusion 2421 in the radial direction of the main body 242, so as to alleviate the phenomenon of poor insulation effect caused by the thickness of the part of the first insulating member 25 located between the first limiting protrusion 2421 and the fixing portion 231 being too small.

[0209] According to some embodiments of the present application, see Figure 7 , Fig.12 and Fig.16 As shown, along the thickness direction X of the wall portion, the first limiting protrusion 2421 is connected to the assembly portion 241, and the first limiting protrusion 2421 is located on the side of the assembly portion 241 facing the thinning area 2312. In other words, the first limiting protrusion 2421 is connected to the surface of the assembly portion 241 on the side away from the wall portion 211 in the thickness direction X of the wall portion, so that the first limiting protrusion 2421 is a structure convexly arranged on the side of the assembly portion 241 facing the thinning area 2312.

[0210] In this embodiment, by connecting the first limiting protrusion 2421 to the side of the assembly portion 241 facing the thinning area 2312 in the thickness direction X of the wall portion, on the one hand, the difficulty of setting the first limiting groove 251 on the first insulating member 25 can be reduced, and the difficulty of assembling the electrode terminal 24 and the first insulating member 25 can be reduced. On the other hand, the first limiting protrusion 2421 can utilize the space between the assembly portion 241 and the thinning area 2312 in the thickness direction X of the wall portion, and there is no need to increase the distance between the fixing portion 231 and the wall portion 211 to avoid the first limiting protrusion 2421, which is beneficial to saving the space occupied by the fixing portion 231 and the wall portion 211 in the thickness direction X of the wall portion, so as to optimize the size of the battery cell 20 in the thickness direction X of the wall portion.

[0211] According to some embodiments of the present application, see Figure 7 As shown, along the thickness direction X of the wall portion, the first limiting protrusion 2421 and the thinning area 2312 are arranged at intervals.

[0212] In this embodiment, the first limiting protrusion 2421 and the thinning area 2312 are arranged as a spaced-apart structure in the thickness direction X of the wall portion to reduce the interference between the first limiting protrusion 2421 and the fixing portion 231, and a first insulating member 25 can be arranged between the first limiting protrusion 2421 and the fixing portion 231 to reduce the risk of short circuit between the first limiting protrusion 2421 and the fixing portion 231.

[0213] In some embodiments, see Figure 7 As shown, along the thickness direction X of the wall, the minimum distance between the first limiting protrusion 2421 and the thinning area 2312 is L, satisfying that L≥0.5 mm.

[0214] Exemplarily, the minimum distance L between the first limiting protrusion 2421 and the thinning area 2312 can be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, etc.

[0215] In this embodiment, by making the dimensions of the first limiting protrusion 2421 and the thinning zone 2312 in the thickness direction X of the wall portion greater than or equal to 0.5 mm, the thickness of the portion of the first insulating member 25 located between the first limiting protrusion 2421 and the thinning zone 2312 can be further increased, which is beneficial to further reduce the difficulty of setting the first insulating member 25 between the first limiting protrusion 2421 and the thinning zone 2312, and can further enhance the effect of the first insulating member 25 in insulating and isolating the thinning zone 2312 and the electrode terminal 24.

[0216] According to some embodiments of the present application, see Fig.10 and Fig.11 As shown, along the thickness direction X of the wall, the thickness of the main area 2311 is D1, and the thickness of the thinned area 2312 is D2, satisfying 1>D2 / D1≥1 / 3.

[0217] The thickness of the main area 2311 is D1, and the thickness of the thinned area 2312 is D2, that is, the thickness of the area of ​​the fixing portion 231 that is not thinned is D1, and the thickness of the area of ​​the fixing portion 231 that is thinned is D2.

[0218] Exemplarily, the thickness D2 of the thinned area 2312 may be 1 / 3 times, 0.35 times, 0.4 times, 0.45 times, 0.5 times, 0.55 times, 0.6 times, 0.65 times, 0.7 times, 0.8 times, 0.9 times, etc., of the thickness D1 of the main area 2311 .

[0219] In this embodiment, by setting the ratio of the thickness of the thinning area 2312 of the fixing portion 231 to the thickness of the main area 2311 of the fixing portion 231 to be greater than or equal to one third, the thickness of the thinning area 2312 is made more than one third of the thickness of the main area 2311, so as to alleviate the phenomenon that the manufacturing difficulty of the thinning area 2312 is too great, and the structural strength of the thinning area 2312 can be improved, so as to alleviate the phenomenon that the thinning area 2312 is deformed or broken due to insufficient structural strength, thereby facilitating improving the stability and reliability of the thinning area 2312 and the wall portion 211 in assembling the electrode terminal 24.

[0220] According to some embodiments of the present application, see Fig.12 , Fig.16 and Fig.17 As shown, one of the electrode terminal 24 and the first insulating member 25 is provided with a first limiting protrusion 2421, and the other is provided with a first limiting groove 251. The first limiting protrusion 2421 is accommodated in the first limiting groove 251. The first limiting groove 251 and the first limiting protrusion 2421 are configured to cooperate to limit the rotation of the electrode terminal 24 relative to the first insulating member 25.

[0221] Among them, the first limiting groove 251 and the first limiting protrusion 2421 are configured to cooperate to limit the rotation of the electrode terminal 24 relative to the first insulating member 25, that is, after the first limiting protrusion 2421 is inserted into the first limiting groove 251, circumferential locking between the electrode terminal 24 and the first insulating member 25 can be achieved to limit the rotation of the electrode terminal 24 relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall.

[0222] Exemplarily, the first limiting protrusion 2421 is protrudingly provided on the outer circumference of the body portion 242 of the electrode terminal 24 , and correspondingly, the first limiting groove 251 is provided on the inner circumference of the first insulating member 25 .

[0223] In this embodiment, by providing a first limiting protrusion 2421 on one of the electrode terminal 24 and the first insulating member 25, and providing a first limiting groove 251 on the other, the first limiting protrusion 2421 can be inserted into the first limiting groove 251 to achieve circumferential locking between the electrode terminal 24 and the first insulating member 25, which is beneficial to alleviate the phenomenon that the electrode terminal 24 rotates relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall portion. On the one hand, it can improve the assembly accuracy between the electrode terminal 24 and the first insulating member 25 and reduce the assembly difficulty between the electrode terminal 24 and the first insulating member 25. On the other hand, it can improve the structural stability of the electrode terminal 24 assembled on the wall portion 211.

[0224] According to some embodiments of the present application, see Figure 8 , Fig. 9 , Fig.16 and Fig.17 As shown, the fixing member 23 is arranged around the electrode terminal 24. One of the thinned area 2312 and the first insulating member 25 is provided with a second limiting groove 2312a, and the other is provided with a second limiting protrusion 252, and the second limiting protrusion 252 is accommodated in the second limiting groove 2312a. The second limiting protrusion 252 and the second limiting groove 2312a are configured to cooperate to limit the fixing member 23 from rotating relative to the first insulating member 25.

[0225] The fixing member 23 is disposed around the electrode terminal 24 , that is, the fixing member 23 is an annular structure and surrounds the outer side of the electrode terminal 24 .

[0226] The second limiting protrusion 252 and the second limiting groove 2312a are configured to cooperate to limit the rotation of the fixing member 23 relative to the first insulating member 25, that is, after the second limiting protrusion 252 is inserted into the second limiting groove 2312a, circumferential locking between the fixing member 23 and the first insulating member 25 can be achieved to limit the rotation of the fixing member 23 relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall.

[0227] Exemplarily, the second limiting protrusion 252 is convexly provided on the outer circumference of the first insulating member 25, and correspondingly, the second limiting groove 2312a is provided on the inner circumference of the thinning area 2312 of the fixing portion 231. Of course, in other embodiments, the second limiting groove 2312a may be provided on the outer circumference of the first insulating member 25, and correspondingly, the second limiting protrusion 252 is convexly provided on the inner circumference of the thinning area 2312 of the fixing portion 231.

[0228] In this embodiment, the fixing member 23 is arranged to be a structure arranged around the electrode terminal 24, and one of the first insulating member 25 and the thinning area 2312 of the fixing portion 231 is provided with a second limiting protrusion 252, and the other is provided with a second limiting groove 2312a, so that after the second limiting protrusion 252 is inserted into the second limiting groove 2312a, circumferential locking between the fixing member 23 and the first insulating member 25 can be achieved, which is beneficial to alleviate the phenomenon that the fixing member 23 rotates relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall portion. On the one hand, it can improve the assembly accuracy between the fixing member 23 and the first insulating member 25, and can reduce the assembly difficulty between the fixing member 23 and the first insulating member 25. On the other hand, it can improve the structural stability and reliability of the fixing member 23 connected to the wall portion 211.

[0229] In some embodiments, see Figure 8 , Fig. 9 and Fig.17 As shown, there are multiple second limiting grooves 2312a, which are arranged at intervals along the circumference of the fixing member 23, and the second limiting protrusions 252 are correspondingly arranged to the second limiting grooves 2312a, and each second limiting groove 2312a is used to accommodate a second limiting protrusion 252.

[0230] Exemplarily, a plurality of second limiting protrusions 252 are convexly provided on the outer circumferential surface of the first insulating member 25, and the plurality of second limiting protrusions 252 are arranged at intervals along the circumference of the first insulating member 25. Correspondingly, a plurality of second limiting grooves 2312a are provided on the thinning area 2312, and the plurality of second limiting grooves 2312a are arranged around the main body 242 so that each second limiting protrusion 252 can be inserted into a second limiting groove 2312a.

[0231] Exemplarily, six second limiting grooves 2312a are provided on the thinning area 2312, and correspondingly, six second limiting protrusions 252 are convexly provided on the outer peripheral surface of the first insulating member 25. Of course, in other embodiments, the number of the second limiting grooves 2312a and the second limiting protrusions 252 can also be two, three, four, five or seven, etc.

[0232] In this embodiment, by providing a plurality of second limiting grooves 2312a, and the plurality of second limiting grooves 2312a are arranged at intervals along the circumference of the fixing member 23, each second limiting groove 2312a is used for inserting a second limiting protrusion 252. The battery cell 20 adopting this structure can further enhance the circumferential locking limiting effect between the fixing member 23 and the first insulating member 25, thereby facilitating further alleviating the phenomenon that the fixing member 23 rotates relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall.

[0233] In some embodiments, see Figure 8 , Fig. 9 , Fig.16 and Fig.17 As shown, the thinning area 2312 is provided with a second limiting groove 2312 a, and the first insulating member 25 is provided with a second limiting protrusion 252 .

[0234] The second limiting groove 2312a is disposed on the inner circumference of the thinning area 2312, and the second limiting protrusion 252 is convexly disposed on the outer circumference of the first insulating member 25. It should be noted that in the embodiment where the fixing portion 231 is an annular structure disposed around the body portion 242, and the fixing portion 231 defines the lead-out hole 2313, the second limiting groove 2312a is disposed on the hole wall surface of the lead-out hole 2313.

[0235] In this embodiment, by setting the second limiting groove 2312a on the thinning area 2312 and correspondingly setting the second limiting protrusion 252 on the first insulating member 25, the battery cell 20 adopting this structure is convenient for processing the second limiting groove 2312a on the thinning area 2312 and assembling the second limiting protrusion 252 of the first insulating member 25 in the second limiting groove 2312a, which is beneficial to reducing the manufacturing difficulty of the battery cell 20. On the other hand, there is no need to protrude the second limiting protrusion 252 on the thinning area 2312, so that the second limiting protrusion 252 does not occupy the space of the thinning area 2312, which is beneficial to alleviate the interference between the second limiting protrusion 252 and the electrode terminal 24.

[0236] According to some embodiments of the present application, see Figure 8 , Fig. 9 , Fig.10 and Fig.16As shown, along the thickness direction X of the wall, the second limiting groove 2312a runs through both sides of the thinning area 2312. That is, both ends of the second limiting groove 2312a in the thickness direction X of the wall extend to the surfaces of both sides of the thinning area 2312 in the thickness direction X of the wall.

[0237] Among them, along the circumference of the main body 242, the two opposite side surfaces of the first limiting protrusion 2421 are located between the two opposite groove side surfaces of the second limiting groove 2312a, so that the first limiting protrusion 2421 is a structure corresponding to the second limiting groove 2312a, thereby being able to further alleviate the interference phenomenon between the first limiting protrusion 2421 and the thinning area 2312, and being able to increase the thickness of the portion of the first insulating member 25 located between the thinning area 2312 and the first limiting protrusion 2421, which is beneficial to improving the effect of the first insulating member 25 in insulating and isolating the electrode terminal 24 and the fixing portion 231.

[0238] It should be noted that, in other embodiments, the second limiting groove 2312a may also be a structure that is only arranged on the inner circumferential surface of the thinning zone 2312 and does not penetrate both sides of the thinning zone 2312 in the thickness direction X of the wall portion. Of course, the second limiting groove 2312a may also be a structure that only penetrates one side of the thinning zone 2312 in the thickness direction X of the wall portion.

[0239] In this embodiment, by setting the second limiting groove 2312a as a structure that passes through both sides of the thinning area 2312 in the thickness direction X of the wall portion, on the one hand, the difficulty of setting the second limiting groove 2312a on the thinning area 2312 can be reduced, and it is convenient to assemble the second limiting protrusion 252 on the first insulating member 25 into the second limiting groove 2312a. On the other hand, the space of the second limiting groove 2312a for accommodating the second limiting protrusion 252 can be further increased, which is beneficial to improving the limiting effect between the first insulating member 25 and the fixing member 23.

[0240] According to some embodiments of the present application, see Figure 6 , Figure 7 , Figure 8 and Fig.10 As shown, the fixing member 23 may further include a connecting portion 232 , wherein the connecting portion 232 connects the wall portion 211 and the fixing portion 231 , and along the thickness direction X of the wall portion, the fixing portion 231 is spaced apart from the wall portion 211 .

[0241] The connecting portion 232 serves to connect the fixing portion 231 and the wall portion 211, so that the fixing portion 231 can be located on one side of the wall portion 211 and spaced apart from the wall portion 211. The connecting portion 232 and the fixing portion 231 can be an integrally formed structure or a separately arranged structure. Figure 8 and Fig.10In the embodiment, the connecting portion 232 and the fixing portion 231 are an integrally formed structure, so that the connecting portion 232 and the fixing portion 231 of the fixing member 23 can be made by an integral forming process such as stamping or casting. Of course, in other embodiments, the connecting portion 232 and the fixing portion 231 can also be a separately arranged structure, and the connecting portion 232 and the fixing portion 231 can be connected to each other by welding or clamping.

[0242] Optionally, the connection structure between the connection portion 232 and the wall portion 211 may be various, such as welding connection, clamping connection or bolt connection.

[0243] In the present embodiment, the fixing member 23 is further provided with a connecting portion 232, and the fixing portion 231 and the wall portion 211 are connected by the connecting portion 232, so as to realize a structure in which the fixing portion 231 and the wall portion 211 are spaced apart along the thickness direction X of the wall portion, thereby facilitating the fixing portion 231 and the wall portion 211 to cooperate with the assembly portion 241 of the electrode terminal 24, and reducing the difficulty of connection between the fixing member 23 and the wall portion 211.

[0244] In some embodiments, please see Figure 6 , Figure 7 , Figure 8 and Fig.10 As shown, the connecting portion 232 may include a first connecting segment 2321 and a second connecting segment 2322. The first connecting segment 2321 is connected to the wall portion 211, and along the thickness direction X of the wall portion, the first connecting segment 2321 and the fixing portion 231 are arranged at intervals. The second connecting segment 2322 connects the first connecting segment 2321 and the main body region 2311. The first connecting segment 2321 extends from the second connecting segment 2322 in a direction away from the electrode terminal 24, and the main body region 2311 extends from the second connecting segment 2322 in a direction close to the electrode terminal 24.

[0245] The second connecting section 2322 of the connecting portion 232 is connected between the first connecting section 2321 and the fixing portion 231 , and one end of the second connecting section 2322 is connected to the first connecting section 2321 , and the other end is connected to one end of the main area 2311 away from the thinning area 2312 .

[0246] The first connection segment 2321 extends from the second connection segment 2322 in a direction away from the electrode terminal 24 . That is, the first connection segment 2321 is a structure extending from one end connected to the second connection segment 2322 along the radial direction of the body portion 242 away from the second connection segment 2322 .

[0247] The main body area 2311 extends from the second connecting section 2322 in a direction close to the electrode terminal 24, that is, the main body area 2311 of the fixing portion 231 is a structure extending from one end connected to the second connecting section 2322 along the radial direction of the main body portion 242 away from the second connecting section 2322, and the thinning area 2312 of the fixing portion 231 is connected to one end of the main body area 2311 away from the second connecting section 2322.

[0248] It should be noted that, in the annular structure in which the fixing member 23 is arranged around the electrode terminal 24, one end of the second connecting section 2322 is connected to the inner circumference of the first connecting section 2321, and the other end is connected to the outer circumference of the main body area 2311, and the thinning area 2312 is connected to the inner circumference of the main body area 2311.

[0249] Exemplarily, the first connecting section 2321 and the second connecting section 2322 of the connecting portion 232 are an integrally formed structure.

[0250] Exemplarily, the first connecting section 2321 is connected to the wall portion 211 by welding.

[0251] In this embodiment, the connecting portion 232 includes a first connecting section 2321 and a second connecting section 2322 that are connected to each other. The first connecting section 2321 is connected to the wall portion 211, and the second connecting section 2322 is connected to the main area 2311 of the fixing portion 231. The first connecting section 2321 and the main area 2311 of the fixing portion 231 are respectively structures extending from both sides of the second connecting section 2322 in a direction away from the second connecting section 2322, so that the cross-section of the fixing member 23 is a "Z"-shaped structure, which on the one hand can optimize the structure of the fixing member 23, which is conducive to reducing the difficulty of connecting the fixing member 23 to the wall portion 211. On the other hand, it is only necessary to connect the thinning area 2312 of the fixing portion 231 to the end of the main area 2311 away from the second connecting section 2322 to achieve that the thinning area 2312 can cooperate with the wall portion 211 to clamp the assembly cavity, and the fixing member 23 using this structure can improve the effect and stability of the thinning area 2312 pressing the assembly portion 241 on the wall portion 211.

[0252] According to some embodiments of the present application, see Figure 5 and Figure 6 As shown, along the thickness direction X of the wall portion, a mounting groove 2112 is provided on one side of the wall portion 211 facing the fixing portion 231 , and at least a portion of the first connecting section 2321 is accommodated in the mounting groove 2112 .

[0253] The terminal hole 2111 is disposed on the bottom surface of the assembly groove 2112 , and the terminal hole 2111 passes through the bottom wall of the assembly groove 2112 to connect the inside and the outside of the housing 21 .

[0254] At least a portion of the first connecting section 2321 is accommodated in the assembly groove 2112, that is, the first connecting section 2321 may be partially accommodated in the assembly groove 2112, or may be entirely accommodated in the assembly groove 2112. Figure 6 In the embodiment, the first connecting section 2321 of the connecting portion 232 is entirely accommodated in the assembly groove 2112 , that is, the first connecting section 2321 does not exceed the notch of the assembly groove 2112 in the thickness direction X of the wall.

[0255] In this embodiment, an assembly groove 2112 for accommodating the first connecting section 2321 of the connecting portion 232 is provided on the side of the wall portion 211 facing the fixing portion 231, so that part of the connecting portion 232 of the fixing member 23 can be inserted into the assembly groove 2112, which is beneficial to further save the space occupied by the fixing member 23 and the wall portion 211 in the thickness direction X of the wall portion.

[0256] In some embodiments, see Figure 6 As shown, the first connecting section 2321 abuts against the groove bottom surface of the assembly groove 2112, and the first connecting section 2321 abuts against the groove side surface of the assembly groove 2112. In other words, the surface of the first connecting section 2321 facing the groove bottom surface of the assembly groove 2112 in the thickness direction X of the wall portion abuts against the groove bottom surface of the assembly groove 2112, and the surface of the first connecting section 2321 facing away from the electrode terminal 24 in the radial direction of the body portion 242 abuts against the groove side surface of the assembly groove 2112.

[0257] It should be noted that in the embodiment where the fixing member 23 is an annular structure surrounding the outer side of the electrode terminal 24 , the annular groove of the assembly groove 2112 and the outer peripheral surface of the first connecting section 2321 correspondingly abut against the groove side surface of the assembly groove 2112 .

[0258] In this embodiment, by setting the first connecting section 2321 of the connecting portion 232 of the fixing member 23 as a structure that abuts against both the bottom surface and the side surface of the assembly groove 2112, the assembly groove 2112 can also play a role in limiting and positioning the first connecting section 2321. On the one hand, it can improve the accuracy of the fixing member 23 being assembled on the wall portion 211 and reduce the difficulty of connecting the fixing member 23 and the wall portion 211. On the other hand, it can further improve the structural stability and reliability of the fixing member 23 assembled on the wall portion 211.

[0259] According to some embodiments of the present application, see Figure 6 , Figure 8 , Fig. 9 and Fig.10 As shown, the fixing portion 231 is disposed around the electrode terminal 24 .

[0260] The fixing portion 231 is an annular structure surrounding the outer side of the main body portion 242 of the electrode terminal 24 , and the thinned area 2312 of the fixing portion 231 is a structure connected to the inner circumference of the main body area 2311 of the fixing portion 231 .

[0261] exist Figure 6 and Figure 7 In the figure, the fixing portion 231 is arranged around the main body portion 242, and the fixing portion 231 defines a lead-out hole 2313. Along the thickness direction X of the wall portion, the main body portion 242 of the electrode terminal 24 is passed through the lead-out hole 2313, and one end of the main body portion 242 away from the electrode assembly 22 protrudes from the side of the fixing portion 231 away from the wall portion 211, so that the end of the main body portion 242 of the electrode terminal 24 protruding from the fixing portion 231 is used to be connected to the busbar component.

[0262] In the present embodiment, the fixing portion 231 of the fixing member 23 is arranged as an annular structure arranged around the electrode terminal 24, so that the fixing portion 231 of the fixing member 23 at any position in its circumferential direction can cooperate with the wall portion 211 to clamp, restrict and assemble the assembly portion 241 of the electrode terminal 24, so that during the mutual assembly of the fixing member 23 and the electrode terminal 24, there is no need to position the fixing member 23 or rotate to adjust the angle, which helps to reduce the difficulty of assembling the assembly portion 241 of the electrode terminal 24 between the wall portion 211 and the thinning area 2312 of the fixing portion 231, and helps to improve the stability and reliability of the electrode terminal 24 assembled on the wall portion 211.

[0263] According to some embodiments of the present application, see Figure 5 and Figure 6 as well as Fig.15 and Fig.16 As shown, at least a portion of the fixing portion 231 is embedded in the first insulating member 25 , and along the thickness direction X of the wall, a portion of the first insulating member 25 is located on a side of the fixing portion 231 away from the wall 211 .

[0264] In this embodiment, by embedding at least a portion of the fixing portion 231 of the fixing member 23 in the first insulating member 25, and a portion of the first insulating member 25 is located on the side of the fixing portion 231 away from the wall portion 211, the first insulating member 25 is a structure that covers at least a portion of the outer side of the fixing portion 231, thereby further improving the connection strength between the fixing member 23 and the first insulating member 25, thereby improving the assembly stability and reliability between the fixing member 23 and the first insulating member, and further reducing the risk of the first insulating member 25 and the fixing member 23 falling off, which is beneficial to improving the assembly quality of the battery cell 20.

[0265] According to some embodiments of this application, please continue to refer to Figure 5 and Figure 6 as well as Fig.15 and Fig.16 As shown, along the thickness direction X of the wall, the fixing portion 231 is located on the side of the wall 211 away from the electrode assembly 22. That is, the fixing member 23 is connected to the side of the wall 211 away from the electrode assembly 22, so that the fixing portion 231 is located outside the housing 21 and is spaced apart from the wall 211.

[0266] It should be noted that, in the embodiment where the fixing member 23 includes a connecting portion 232, the connecting portion 232 is a structure connected to the side of the wall portion 211 away from the electrode assembly 22. And in the embodiment where the wall portion 211 is provided with an assembly groove 2112, the assembly groove 2112 is provided on the surface of the side of the wall portion 211 away from the electrode assembly 22.

[0267] In this embodiment, by setting the fixing portion 231 of the fixing member 23 to be located on the side of the wall portion 211 away from the electrode assembly 22 in the thickness direction X of the wall portion, the fixing member 23 is a structure connected to the side of the wall portion 211 away from the electrode assembly 22, and the fixing portion 231 of the fixing member 23 is a structure for assembling the electrode terminal 24 to the wall portion 211 from the side of the wall portion 211 away from the electrode assembly 22. The battery cell 20 adopting this structure can, on the one hand, reduce the difficulty of connecting the fixing member 23 and the wall portion 211, and on the other hand, facilitate the assembly of the electrode terminal 24, which is beneficial to reduce the difficulty of assembling the electrode terminal 24 on the wall portion 211.

[0268] According to some embodiments of the present application, see Figure 5 and Figure 6 as well as Fig.15 and Fig.16 As shown, the battery cell 20 may further include a second insulating member 27 . At least a portion of the second insulating member 27 is disposed between the wall portion 211 and the electrode terminal 24 along the thickness direction X of the wall portion, and the second insulating member 27 is configured to insulate and isolate the wall portion 211 and the electrode terminal 24 .

[0269] Among them, the assembly portion 241 of the electrode terminal 24 is located on one side of the wall portion 211 in the thickness direction X of the wall portion, and part of the first insulating member 25 is arranged between the assembly portion 241 and the wall portion 211 in the thickness direction X of the wall portion to insulate and isolate the wall portion 211 and the electrode terminal 24.

[0270] Exemplarily, the material of the second insulating member 27 may be rubber, plastic, or silicone.

[0271] In this embodiment, the battery cell 20 is also provided with a second insulating member 27, and at least a portion of the second insulating member 27 is located between the wall portion 211 and the electrode terminal 24, so that the wall portion 211 and the electrode terminal 24 can be insulated and isolated by the second insulating member 27, which is beneficial to reducing the risk of short circuit between the electrode terminal 24 and the wall portion 211.

[0272] In some embodiments, see Figure 5 and Figure 6 as well as Fig.15 and Fig.16 As shown, the wall portion 211 is provided with a terminal hole 2111, and the terminal hole 2111 penetrates the wall portion 211 along the thickness direction X of the wall portion, and a portion of the electrode terminal 24 extends into the terminal hole 2111, and the portion of the electrode terminal 24 extending into the terminal hole 2111 is electrically connected to the electrode assembly 22. The second insulating member 27 is arranged around the terminal hole 2111, and the second insulating member 27 is also configured to seal the gap between the wall portion 211 and the electrode terminal 24.

[0273] The second insulating member 27 is disposed around the terminal hole 2111 , that is, the second insulating member 27 is an annular structure extending along the circumference of the terminal.

[0274] In this embodiment, a terminal hole 2111 for inserting the electrode terminal 24 is further provided on the wall portion 211, so that the electrode terminal 24 can be electrically connected to the electrode assembly 22 accommodated in the outer shell 21. By setting the second insulating member 27 as a structure arranged around the terminal hole 2111, the second insulating member 27 can also play a role in sealing the gap between the wall portion 211 and the electrode terminal 24, which is beneficial to reduce the risk of leakage of the battery cell 20 at the terminal hole 2111.

[0275] According to some embodiments of the present application, see Figure 5 and Figure 6 As shown, the fixing member 23 and the wall portion 211 are separately provided, that is, the fixing member 23 and the wall portion 211 are a split structure, and the fixing member 23 is connected to the wall portion 211 .

[0276] Exemplarily, the connection portion 232 of the fixing member 23 is connected to the wall portion 211 by welding. Of course, in other embodiments, the fixing member 23 may also be connected to the wall portion 211 by a structure such as a snap connection or a bolt connection.

[0277] In this embodiment, by setting the fixing member 23 and the wall portion 211 as a separate structure, it is helpful to reduce the difficulty of setting the fixing member 23 on the wall portion 211, and it is convenient to assemble the assembly portion 241 of the electrode terminal 24 between the fixing portion 231 of the fixing member 23 and the wall portion 211, thereby helping to reduce the difficulty of assembling the electrode terminal 24 to the wall portion 211.

[0278] Of course, in some embodiments, the battery cell 20 may also be other structures, for example, the fixing member 23 and the wall portion 211 are integrally formed. That is, the fixing member 23 and the wall portion 211 are structures made by an integral forming process, such as casting, stamping or milling.

[0279] In this embodiment, the fixing member 23 and the wall portion 211 are arranged as an integrally formed structure, so that the fixing member 23 and the wall portion 211 are an integral structure formed by an integral molding process, thereby being able to improve the connection strength and connection stability between the fixing member 23 and the wall portion 211, thereby improving the stability of the fixing portion 231 of the fixing member 23 and the wall portion 211 that cooperates to clamp the assembly portion 241 of the electrode assembly 22, thereby facilitating improving the reliability of the electrode terminal 24 being assembled on the wall portion 211.

[0280] According to some embodiments of the present application, see Figure 3 and Figure 4 As shown, the housing 21 may include a shell 212 and an end cap 213. The shell 212 has an accommodation cavity with an opening 2121 formed inside, and the accommodation cavity is used to accommodate the electrode assembly 22. The end cap 213 closes the opening 2121, and the end cap 213 is a wall portion 211.

[0281] Among them, the end cover 213 is the wall portion 211, that is, the fixing member 23 and the electrode terminal 24 are both arranged on the end cover 213 of the shell 21, and the thinning area 2312 of the fixing portion 231 of the fixing member 23 is a structure that cooperates with the end cover 213 of the shell 21 to clamp the assembly portion 241 of the electrode terminal 24.

[0282] In this embodiment, by setting the wall portion 211 of the outer shell 21 as the end cover 213 of the outer shell 21 for closing the opening 2121 of the shell 212, the battery cell 20 adopting this structure is convenient for assembling the electrode terminal 24 to the wall portion 211 through the fixing member 23, which is beneficial to reducing the difficulty of assembling the electrode terminal 24 to the wall portion 211, and is convenient for electrically connecting the electrode terminal 24 with the electrode assembly 22, which is beneficial to reducing the difficulty of assembling the electrode terminal 24 with the electrode assembly 22, thereby effectively reducing the difficulty of assembling the battery cell 20 and improving the production efficiency of the battery cell 20.

[0283] It should be noted that the structure of the battery cell 20 is not limited thereto. In other embodiments, the battery cell 20 may also be other structures. For example, the housing 21 may include a shell 212 and an end cap 213. The shell 212 includes an integrally formed side wall and a wall portion 211. The side wall is arranged around the wall portion 211. Along the thickness direction X of the wall portion, one end of the side wall is connected to the wall portion 211, and the other end is enclosed to form an opening 2121. The side wall and the wall portion 211 jointly define a receiving cavity for accommodating the electrode assembly 22, and the end cap 213 closes the opening 2121. In other words, the fixing member 23 and the electrode terminal 24 are both arranged on the bottom wall of the shell 212 that is arranged opposite to the end cap 213 in the thickness direction X of the wall portion, and the thinned area 2312 of the fixing portion 231 of the fixing member 23 is a structure that cooperates with the bottom wall of the shell 212 to clamp the assembly portion 241 of the electrode terminal 24.

[0284] In the present embodiment, by setting the wall portion 211 of the outer shell 21 as a wall of the shell 212 that is arranged opposite to the end cover 213 in the thickness direction X of the wall portion, the battery cell 20 adopting such a structure can make the wall portion 211 equipped with the electrode terminal 24 and the fixing member 23 away from the end cover 213, so that there is no direct connection relationship between the wall portion 211 and the end cover 213, thereby alleviating the phenomenon that the force generated when the electrode terminal 24 and the fixing member 23 pull or twist the wall portion 211 acts on the end cover 213, thereby reducing the risk of connection failure between the end cover 213 and the shell 212, and further helping to reduce the risk of leakage of the battery cell 20 during use.

[0285] According to some embodiments of the present application, referring to Fig.18 , Fig.18 The cross-sectional view of the electrode terminal 24 provided in some other embodiments of the present application. The electrode terminal 24 includes a first material layer 243 and a second material layer 244 which are compounded with each other. The first material layer 243 is connected to the pole ear 221 of the electrode assembly 22, and the second material layer 244 is used to be connected to the confluence component. The material of the first material layer 243 is different from the material of the second material layer 244. The material of the first material layer 243 is the same as the material of the pole ear 221 of the electrode assembly 22, and the material of the second material layer 244 is the same as the material of the confluence component.

[0286] Among them, the electrode terminal 24 includes a first material layer 243 and a second material layer 244 that are composited with each other. The material of the first material layer 243 and the material of the second material layer 244 are different. That is, the electrode terminal 24 is composed of a first material layer 243 and a second material layer 244 of different materials that are composited and connected to each other. Optionally, the first material layer 243 and the second material layer 244 of the electrode terminal 24 can be connected by a composite process such as hot pressing or cold pressing.

[0287] The first material layer 243 is connected to the tab 221 of the electrode assembly 22, and the material of the first material layer 243 is the same as the material of the tab 221 of the electrode assembly 22, that is, the electrode terminal 24 is a structure in which the first material layer 243 and the tab 221 are connected to each other, and the material of the first material layer 243 is the same as the material of the tab 221, so as to realize that the material used for welding the electrode terminal 24 to the tab 221 is the same. It should be noted that in the embodiment in which the electrode terminal 24 is connected to the tab 221 through the current collecting member 26, the materials of the correspondingly connected first material layer 243, the current collecting member 26 and the tab 221 are all the same, so as to reduce the welding connection between the electrode terminal 24 and the current collecting member 26 and between the current collecting member 26 and the tab 221, and improve the welding quality.

[0288] The second material layer 244 is used to be connected to the busbar component, and the material of the second material layer 244 is the same as that of the busbar component, that is, the second material layer 244 and the busbar component are interconnected in the electrode terminal 24, and the material of the second material layer 244 is the same as that of the busbar component, so that the material of the portion of the electrode terminal 24 used for welding with the busbar component is the same, which is beneficial to reduce the difficulty of welding and can improve the welding quality.

[0289] It should be noted that the material of the first material layer 243 and the material of the pole lug 221 being the same means that the main component of the first material layer 243 is the same as the main component of the pole lug 221. For example, if the first material layer 243 and the pole lug 221 are both made of a single material, such as copper or aluminum, then the first material layer 243 and the pole lug 221 are composed of the same metal element; if the first material layer 243 and the pole lug 221 are alloy materials or mixed materials, such as aluminum alloy or steel, then the material of the first material layer 243 and the pole lug 221 being the same means that the main components of the first material layer 243 and the pole lug 221 are the same; if the first material layer 243 and the pole lug 221 are different only in the content of the components, then they are also the same material. Similarly, the material of the second material layer 244 is the same as the material of the convergence component means that the main component of the second material layer 244 is the same as the main component of the convergence component. For example, if the second material layer 244 and the convergence component are both made of a single material, such as copper or aluminum, then the second material layer 244 and the convergence component are composed of the same metal element; if the second material layer 244 and the convergence component are alloy materials or mixed materials, such as aluminum alloy or steel, then the material of the second material layer 244 and the convergence component is the same means that the main components of the second material layer 244 and the convergence component are the same; if the second material layer 244 and the convergence component only differ in the content of the components, then they are also the same material.

[0290] Exemplarily, in the application embodiment, the current collecting component is made of aluminum, and the electrode assembly 22 includes two pole ears 221, which are respectively a positive pole ear 221 and a negative pole ear 221, the positive pole ear 221 is made of aluminum, and the negative pole ear 221 is made of copper. Among the two current collecting components 26, the current collecting component 26 connected to the positive pole ear 221 is made of aluminum, and the current collecting component 26 connected to the negative pole ear 221 is made of copper. Therefore, in the two electrode terminals 24 of the battery cell 20, the first material layer 243 and the second material layer 244 of the electrode terminal 24 electrically connected to the positive pole ear 221 are both made of aluminum, while the first material layer 243 of the electrode terminal 24 connected to the negative pole ear 221 is copper, and the second material layer 244 is aluminum.

[0291] In this embodiment, the electrode terminal 24 is configured to be composed of a first material layer 243 and a second material layer 244 which are compositely connected to each other, and the material of the first material layer 243 is the same as the material of the pole ear 221 of the electrode assembly 22, and the material of the second material layer 244 is the same as the material of the busbar component, so that the electrode terminal 24 can be connected to the pole ear 221 of the electrode assembly 22 of the same material, and the second material layer 244 of the electrode terminal 24 can be connected to the busbar component of the same material, so that the electrode terminal 24 of this structure can realize the connection between the pole ear 221 of the electrode assembly 22 of different materials and the busbar component, which is beneficial to improving the current flow effect and can alleviate the quality problems caused by the mutual assembly and connection between different materials.

[0292] In some embodiments, please see Fig.18 As shown, the first material layer 243 and the second material layer 244 are stacked along the thickness direction X of the wall portion, and the first material layer 243 is located on a side of the second material layer 244 facing the electrode assembly 22 .

[0293] In which, in an embodiment where the electrode terminal 24 includes a main body portion 242 and an assembly portion 241, and the assembly portion 241 is protruded from the outer peripheral surface of the main body portion 242, the connection interface between the first material layer 243 and the second material layer 244 can be only on the main body portion 242, or on the main body portion 242 and the assembly portion 241.

[0294] For example, in Fig.18 In the figure, the connection interface between the first material layer 243 and the second material layer 244 is located on the main body 242 and the assembly part 241, that is, the main body 242 includes both the first material layer 243 and the second material layer 244, and the assembly part 241 also includes both the first material layer 243 and the second material layer 244.

[0295] By arranging the first material layer 243 and the second material layer 244 of the electrode terminal 24 as a structure stacked along the thickness direction X of the wall, and the first material layer 243 is located on the side of the second material layer 244 facing the electrode assembly 22, the electrode terminal 24 with such a structure can, on the one hand, realize the facing arrangement of the first material layer 243 and the first terminal portion, so that the first material layer 243 is assembled and connected with the pole ear 221 of the electrode assembly 22 through the current collecting component 26, and on the other hand, it is convenient to compositely connect the first material and the second material layer 244 together, which is beneficial to reduce the difficulty of compositely connecting the first material layer 243 and the second material layer 244.

[0296] According to some embodiments of the present application, the present application further provides a battery 100, and the battery 100 includes a battery cell 20 of any of the above schemes.

[0297] Among them, see Figure 2 As shown, the battery 100 may further include a housing 10 , in which the battery cells 20 are accommodated.

[0298] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12 . The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20 .

[0299] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also be hollow structures both with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0300] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid. Figure 2 In the embodiment, the box body 10 is a rectangular parallelepiped structure.

[0301] Optionally, the number of battery cells 20 disposed in the box body 10 may be one or more. Figure 2 In the embodiment, a plurality of battery cells 20 are arranged in the box 10 of the battery 100, and the plurality of battery cells 20 can be connected in series, in parallel or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are both connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by first connecting the plurality of battery cells 20 in series, in parallel or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 10.

[0302] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which connects electrode terminals 24 with the same polarity in a plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0303] It should be noted that, in some embodiments, the battery 100 may not be provided with a box 10, and the battery 100 includes a plurality of battery cells 20, and the battery 100 composed of a plurality of battery cells 20 may be directly assembled on an electrical device to provide electrical energy to the electrical device through the plurality of battery cells 20. In other words, the box 10 may be used as a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box 10 may be used as a part of the chassis structure of the vehicle 1000, for example, a part of the box 10 may become at least a part of the floor of the vehicle 1000, or a part of the box 10 may become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0304] According to some embodiments of the present application, the present application further provides an electrical device, which includes a battery cell 20 according to any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0305] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0306] According to some embodiments of the present application, see Figures 3 to 17As shown, the present application provides a battery cell 20, which includes a shell 21, an electrode assembly 22, a fixing member 23, an electrode terminal 24, a first insulating member 25, a current collecting member 26, and a second insulating member 27. The shell 21 has a wall portion 211, and the shell 21 includes a shell 212 and an end cover 213. The shell 212 has a receiving cavity with an opening 2121 formed inside, and the end cover 213 closes the opening 2121. The end cover 213 is the wall portion 211. The wall portion 211 is provided with an assembly groove 2112 on one side away from the receiving cavity, and the bottom surface of the assembly groove 2112 is provided with a terminal hole 2111, and the terminal hole 2111 penetrates the wall portion 211 along the thickness direction X of the wall portion. The electrode assembly 22 is accommodated in the receiving cavity. The fixing member 23 is separately provided from the wall portion 211, and the fixing member 23 includes a fixing portion 231 and a connecting portion 232. The fixing portion 231 is located on the side of the wall portion 211 away from the electrode assembly 22 and is spaced apart from the wall portion 211. The fixing portion 231 includes a main body area 2311 and a thinning area 2312 connected to each other. Along the thickness direction X of the wall portion, the thinning area 2312 is farther away from the wall portion 211 than the main body area 2311. Along the thickness direction X of the wall portion, the thickness of the main body area 2311 is D1, and the thickness of the thinning area 2312 is D2, satisfying 1>D2 / D1≥1 / 3. The electrode terminal 24 is provided on the wall portion 211, and the electrode terminal 24 is electrically connected to the electrode assembly 22. The fixing member 23 is provided around the electrode terminal 24. The connecting portion 232 includes a first connecting segment 2321 and a second connecting segment 2322. The first connecting segment 2321 is welded to the wall portion 211. The first connecting segment 2321 and the fixing portion 231 are arranged at intervals along the thickness direction X of the wall portion. The second connecting segment 2322 connects the first connecting segment 2321 and the main body region 2311. The first connecting segment 2321 extends from the second connecting segment 2322 in a direction away from the electrode terminal 24, and the main body region 2311 extends from the second connecting segment 2322 in a direction close to the electrode terminal 24. Along the thickness direction X of the wall portion, a mounting groove 2112 is provided on one side of the wall portion 211 facing the fixing portion 231. At least a portion of the first connecting segment 2321 is accommodated in the mounting groove 2112. The first connecting segment 2321 abuts against the bottom surface of the mounting groove 2112, and the first connecting segment 2321 abuts against the side surface of the mounting groove 2112. The first insulating member 25 is arranged between the electrode terminal 24 and the fixing member 23 to insulate and isolate the electrode terminal 24 and the fixing member 23. At least a portion of the fixing portion 231 is embedded in the first insulating member 25. Along the thickness direction X of the wall, a portion of the first insulating member 25 is located on the side of the fixing portion 231 away from the wall portion 211.The electrode terminal 24 includes a main body portion 242 and an assembly portion 241. The main body portion 242 is inserted into the terminal hole 2111 along the thickness direction X of the wall portion, and the main body portion 242 is electrically connected to the electrode assembly 22. The assembly portion 241 is protruded on the outer peripheral surface of the main body portion 242 and is arranged around the main body portion 242. The assembly portion 241 extends between the thinning area 2312 and the wall portion 211. The projection of the main body area 2311 does not overlap with the projection of the assembly portion 241. The thinning area 2312 is configured to cooperate with the wall portion 211 to limit the movement of the electrode terminal 24 along the thickness direction X of the wall portion. The thinning area 2312 is located between the main body area 2311 and the main body portion 242, and part of the first insulating member 25 is located between the thinning area 2312 and the outer peripheral surface of the main body portion 242. A plurality of first limiting protrusions 2421 are convexly provided on the outer circumference of the body portion 242, and a plurality of first limiting grooves 251 are provided on the inner circumference of the first insulating member 25. The plurality of first limiting protrusions 2421 are arranged at intervals along the circumference of the body portion 242, and the first limiting grooves 251 are provided correspondingly to the first limiting protrusions 2421. Each first limiting groove 251 is used to accommodate a first limiting protrusion 2421, and the first limiting grooves 251 and the first limiting protrusions 2421 are configured to cooperate to limit the rotation of the electrode terminal 24 relative to the first insulating member 25. The dimension of the first limiting protrusion 2421 protruding from the outer circumference of the body portion 242 is smaller than the dimension of the assembly portion 241 protruding from the outer circumference of the body portion 242. Along the thickness direction X of the wall, the first limiting protrusion 2421 is connected to the assembly portion 241 and is located on the side of the assembly portion 241 facing the thinning area 2312 . The minimum distance between the first limiting protrusion 2421 and the thinning area 2312 is L, satisfying L≥0.5mm. A plurality of second limiting grooves 2312a are provided on the inner circumferential surface of the thinning zone 2312, and the second limiting grooves 2312a penetrate both sides of the thinning zone 2312 along the thickness direction X of the wall portion. A plurality of second limiting protrusions 252 are provided on the outer circumferential surface of the first insulating member 25, and the plurality of second limiting grooves 2312a are arranged at intervals along the circumferential direction of the fixing member 23, and the second limiting protrusions 252 are provided corresponding to the second limiting grooves 2312a, and each second limiting groove 2312a is used to accommodate a second limiting protrusion 252, and the second limiting protrusion 252 and the second limiting groove 2312a are configured to cooperate to limit the rotation of the fixing member 23 relative to the first insulating member 25. The current collecting component 26 is arranged in the outer shell 21 and is located between the wall portion 211 and the electrode assembly 22. A protrusion 261 is protruded from the side of the current collecting component 26 facing the wall portion 211. The protrusion 261 is inserted into the terminal hole 2111 along the thickness direction X of the wall portion and is welded to the main body 242 of the electrode terminal 24. The side of the current collecting component 26 facing away from the wall portion 211 is welded to the pole ear 221 of the electrode assembly 22 to electrically connect the electrode assembly 22 and the electrode terminal 24.Along the thickness direction X of the wall portion, at least a portion of the second insulating member 27 is arranged between the wall portion 211 and the electrode terminal 24, the second insulating member 27 is configured to insulate and isolate the wall portion 211 and the electrode terminal 24, and the second insulating member 27 is arranged around the terminal hole 2111, and the second insulating member 27 is also configured to seal the gap between the wall portion 211 and the electrode terminal 24.

[0307] 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.

[0308] 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, It is characterized in that include: a housing having a wall portion; an electrode assembly, contained in the housing; A fixing member connected to the wall portion, the fixing member comprising a fixing portion, and the fixing portion is located at one side of the wall portion along the thickness direction of the wall portion; an electrode terminal, disposed on the wall portion, the electrode terminal being electrically connected to the electrode assembly; as well as A first insulating member is disposed between the electrode terminal and the fixing member to insulate and isolate the electrode terminal from the fixing member; In which, the fixing portion includes a main body area and a thinning area that are interconnected. Along the thickness direction of the wall portion, the thinning area is farther away from the wall portion than the main body area. The electrode terminal has an assembly portion extending between the thinning area and the wall portion. The projection of the main body area does not overlap with the projection of the assembly portion. The thinning area is configured to cooperate with the wall portion to limit the movement of the electrode terminal along the thickness direction of the wall portion.

2. The battery cell according to claim 1, It is characterized in that The electrode terminal comprises: A main body portion, electrically connected to the electrode assembly, wherein the assembly portion is protrudingly disposed on an outer peripheral surface of the main body portion; The thinning area is located between the main body area and the main body portion, and a portion of the first insulating member is located between the thinning area and an outer peripheral surface of the main body portion.

3. The battery cell according to claim 2, It is characterized in that The assembly portion surrounds the outer side of the main body portion.

4. The battery cell according to claim 2, It is characterized in that One of the main body and the first insulating member is provided with a first limiting protrusion, and the other is provided with a first limiting groove, the first limiting protrusion is accommodated in the first limiting groove, and the first limiting groove and the first limiting protrusion are configured to cooperate to limit the rotation of the electrode terminal relative to the first insulating member.

5. The battery cell according to claim 4, It is characterized in that There are multiple first limiting protrusions, and the multiple first limiting protrusions are arranged at intervals along the circumference of the main body. The first limiting grooves are correspondingly arranged to the first limiting protrusions, and each of the first limiting grooves is used to accommodate one first limiting protrusion.

6. The battery cell according to claim 4, It is characterized in that The first limiting protrusion is convexly provided on the outer peripheral surface of the main body, and the first insulating member is provided with the first limiting groove.

7. The battery cell according to claim 6, It is characterized in that The dimension of the first limiting protrusion protruding from the outer circumferential surface of the main body is smaller than the dimension of the assembling portion protruding from the outer circumferential surface of the main body.

8. The battery cell according to claim 6, It is characterized in that Along the thickness direction of the wall portion, the first limiting protrusion is connected to the assembly portion, and the first limiting protrusion is located on a side of the assembly portion facing the thinning area.

9. The battery cell according to claim 8, It is characterized in that Along the thickness direction of the wall portion, the first limiting protrusion is spaced apart from the thinning area.

10. The battery cell according to claim 9, It is characterized in that Along the thickness direction of the wall portion, the minimum distance between the first limiting protrusion and the thinning area is L, satisfying that L≥0.5 mm.

11. The battery cell according to claim 1, It is characterized in that Along the thickness direction of the wall portion, the thickness of the main body region is D 1 , the thickness of the thinned area is D 2 , satisfying, 1>D 2 / D 1 ≥1 / 3.

12. The battery cell according to claim 1, It is characterized in that One of the electrode terminal and the first insulating member is provided with a first limiting protrusion, and the other is provided with a first limiting groove, the first limiting protrusion is accommodated in the first limiting groove, and the first limiting groove and the first limiting protrusion are configured to cooperate to limit the rotation of the electrode terminal relative to the first insulating member.

13. The battery cell according to any one of claims 1 to 12, It is characterized in that The fixing member is arranged around the electrode terminal; Among them, one of the thinning area and the first insulating member is provided with a second limiting groove, and the other is provided with a second limiting protrusion, the second limiting protrusion is accommodated in the second limiting groove, and the second limiting protrusion and the second limiting groove are configured to cooperate to limit the rotation of the fixing member relative to the first insulating member.

14. The battery cell according to claim 13, It is characterized in that There are a plurality of the second limiting grooves, which are arranged at intervals along the circumference of the fixing member. The second limiting protrusions are arranged corresponding to the second limiting grooves, and each of the second limiting grooves is used to accommodate one second limiting protrusion.

15. The battery cell according to claim 13, It is characterized in that The thinning area is provided with the second limiting groove, and the first insulating member is provided with the second limiting protrusion.

16. The battery cell according to claim 15, It is characterized in that Along the thickness direction of the wall portion, the second limiting groove runs through both sides of the thinning area.

17. The battery cell according to claim 1, It is characterized in that The fixing member further includes a connecting portion, which connects the wall portion and the fixing portion. Along a thickness direction of the wall portion, the fixing portion is spaced apart from the wall portion.

18. The battery cell according to claim 17, It is characterized in that The connecting portion comprises: A first connecting section connected to the wall portion, wherein the first connecting section and the fixing portion are arranged at intervals along a thickness direction of the wall portion; a second connecting section, connecting the first connecting section and the main body area; The first connecting section extends from the second connecting section in a direction away from the electrode terminal, and the main body region extends from the second connecting section in a direction close to the electrode terminal.

19. The battery cell according to claim 18, It is characterized in that Along the thickness direction of the wall portion, a mounting groove is provided on one side of the wall portion facing the fixing portion, and at least a portion of the first connecting section is accommodated in the mounting groove.

20. The battery cell according to claim 19, It is characterized in that The first connecting section abuts against the bottom surface of the assembly groove, and the first connecting section abuts against the side surface of the assembly groove.

21. The battery cell according to claim 1, It is characterized in that The fixing portion is disposed around the electrode terminal.

22. The battery cell according to claim 1, It is characterized in that At least a portion of the fixing portion is embedded in the first insulating member, and along the thickness direction of the wall portion, a portion of the first insulating member is located at a side of the fixing portion away from the wall portion.

23. The battery cell according to claim 1, It is characterized in that Along the thickness direction of the wall portion, the fixing portion is located at a side of the wall portion away from the electrode assembly.

24. The battery cell according to claim 1, It is characterized in that The battery cell further comprises: A second insulating member is provided along a thickness direction of the wall portion, at least a portion of the second insulating member is disposed between the wall portion and the electrode terminal, and the second insulating member is configured to insulate and isolate the wall portion from the electrode terminal.

25. The battery cell according to claim 24, It is characterized in that The wall portion is provided with a terminal hole, the terminal hole penetrates the wall portion along the thickness direction of the wall portion, a portion of the electrode terminal extends into the terminal hole, and the portion of the electrode terminal extending into the terminal hole is electrically connected to the electrode assembly; The second insulating member is disposed around the terminal hole, and is further configured to seal a gap between the wall portion and the electrode terminal.

26. The battery cell according to claim 1, It is characterized in that The fixing member is separately arranged from the wall portion; or The fixing member is integrally formed with the wall portion.

27. The battery cell according to claim 1, It is characterized in that The housing comprises: A shell body, wherein a receiving cavity with an opening is formed inside, and the receiving cavity is used to receive the electrode assembly; an end cap for closing the opening; Wherein, the end cover is the wall portion.

28. The battery cell according to claim 1, It is characterized in that The housing comprises: A shell, comprising an integrally formed side wall and the wall portion, wherein the side wall is disposed around the wall portion, and along the thickness direction of the wall portion, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define a housing cavity for housing the electrode assembly; An end cap closes the opening.

29. A battery, It is characterized in that Comprising the battery cell according to any one of claims 1-28.

30. An electrical device, It is characterized in that The invention comprises a battery cell as claimed in any one of claims 1 to 28, wherein the battery cell is used to provide electrical energy.

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