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 and the wall part are arranged in a spaced mode 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 part comprises a first part, a second part and a third part, the second part and the third part are connected to the first part, the first part is arranged between the electrode terminal and the fixing part to insulate and isolate the electrode terminal and the fixing part, and the second part is located between the fixing part and the wall part in the thickness direction of the wall part; a portion of the electrode terminal is located between the third portion and the wall portion. The projection of the fixing part and the projection of the electrode terminal do not overlap in the thickness direction of the wall part, so that the space occupied by the fixing part in the thickness direction of the wall part is saved.

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 comprises a fixing portion, and the fixing portion is spaced apart from the wall portion along the thickness direction 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 comprises a first part, a second part and a third part, the first part is arranged between the electrode terminal and the fixing member to insulate and isolate the electrode terminal and the fixing member, the second part and the third part are both connected to the first part, and along the thickness direction of the wall portion, the second part is located between the fixing portion and the wall portion, and a part of the electrode terminal is located between the third part and the wall portion; wherein, along the thickness direction of the wall portion, the projection of the fixing portion does not overlap with the projection of the electrode terminal.

[0005] In the above technical solution, a fixing member is connected to the wall portion, and the fixing member has a fixing portion spaced apart from the wall portion in the thickness direction of the wall portion, and the first insulating member is provided with a first portion for insulating and isolating the fixing member and the electrode terminal, and a second portion and a third portion connected to the first portion, and by arranging the second portion of the first insulating member between the wall portion and the fixing portion of the fixing member in the thickness direction of the wall portion, and arranging the portion of the electrode terminal between the third portion of the first insulating member and the wall portion in the thickness direction of the wall portion, the wall portion and the fixing portion of the fixing member can cooperate to assemble the first insulating member, so as to cooperate to limit the movement of the first insulating member along the thickness direction of the wall portion, and the first insulating member can further cooperate with the wall portion to limit the movement of the electrode terminal along the thickness direction of the wall portion, so as to realize the assembly of the electrode terminal on the wall portion, wherein, by setting the fixing portion of the fixing member to a structure in which the projection in the thickness direction of the wall portion does not overlap with the electrode terminal, the fixing portion is a structure through which the first insulating member is spaced apart. The structure of the electrode terminal assembled with the wall portion is connected. The battery cell adopting this structure can realize the assembly and fastening of the electrode terminal without extending part of the electrode terminal to between the fixing portion and the wall portion. On the one hand, the size of the first part of the first insulating member located between the fixing portion and the electrode terminal in the thickness direction of the wall portion will not be limited and constrained by the fixing portion, thereby improving the effect of the first insulating member in insulating and isolating the fixing portion and the electrode terminal of the fixing member. On the other hand, the distance between the fixing portion and the wall portion will not be limited and constrained by the electrode terminal, and 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 member 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 member used to assemble the electrode terminal in the thickness direction of the wall portion, thereby saving 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 and an assembly portion; the main body is electrically connected to the electrode assembly; the assembly portion is protruding from the outer peripheral surface of the main body, and along the thickness direction of the wall, the assembly portion is located between the third part and the wall.

[0007] In the above technical solution, the electrode terminal includes a main body portion and an assembly portion, and the assembly portion of the electrode terminal is a structure protruding from the outer peripheral surface of the main body portion. By setting the assembly portion to be located between the third portion and the wall portion, the assembly portion extends between the wall portion and the third portion of the first insulating member, so that the third portion of the first insulating member can cooperate with the wall portion to limit the movement of the electrode terminal along the thickness direction of the wall portion, so that the fixing portion can indirectly cooperate with the wall portion in the thickness direction of the wall portion through the first insulating member to clamp and limit the assembly portion of the electrode terminal, so as to realize the assembly of the electrode terminal to the wall portion. The structure is simple and easy to assemble.

[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 portion as an annular structure surrounding the outer side of the main body portion, any position of the assembly portion in the circumferential direction of the main body portion can be clamped and restricted by the wall portion and the first insulating member, 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 portion of the electrode terminal between the wall portion and the first insulating member, and is beneficial to improving the stability and reliability of the electrode terminal assembled on the wall portion.

[0010] In some embodiments, along a first direction, a projection of the fixing portion at least partially overlaps with a projection of the mounting portion, and the first direction is perpendicular to a thickness direction of the wall portion.

[0011] In the above technical solution, by setting the projection of the fixing portion of the fixing member in the direction perpendicular to the thickness direction of the wall portion to at least partially overlap with the assembly portion of the electrode terminal, the fixing portion of the fixing member and the assembly portion of the electrode terminal can share part of the space in the thickness direction of the wall portion, thereby further optimizing the size of the fixing member in the thickness direction of the wall portion, and optimizing the size of the electrode terminal in the thickness direction of the wall portion, thereby reducing the space occupied by the electrode terminal and the fixing member for assembling the electrode terminal in the thickness direction of the wall portion, thereby saving 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.

[0012] In some embodiments, the fixing portion is disposed around the main body portion, the fixing portion defines an outlet hole for the main body portion to pass through along a thickness direction of the wall portion, and at least a portion of the assembly portion is located in the outlet hole.

[0013] In the above technical solution, the fixing portion is an annular structure arranged around the main body portion, and the fixing portion defines a lead-out hole for the main body portion to pass through along the thickness direction of the wall portion. By setting at least a portion of the assembly portion of the electrode terminal for assembling and fastening the wall portion and the first insulating member to be located in the lead-out hole, the fixing portion of the fixing member and the assembly portion of the electrode terminal can share part of the space in the thickness direction of the wall portion, thereby further optimizing the size of the fixing member in the thickness direction of the wall portion, and optimizing the size of the electrode terminal in the thickness direction of the wall portion, thereby reducing the space occupied by the electrode terminal and the fixing member for assembling the electrode terminal in the thickness direction of the wall portion, thereby saving 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] In the above technical solution, by protruding the first limiting protrusion on the outer peripheral surface of the main body and setting the first limiting groove 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 improving the current carrying capacity of the electrode terminal.

[0020] In some embodiments, along a first direction, a projection of the fixing portion at least partially overlaps with a projection of the first limiting protrusion, and the first direction is perpendicular to a thickness direction of the wall portion.

[0021] In the above technical solution, by setting the projection of the fixing part of the fixing member in the direction perpendicular to the thickness direction of the wall portion to at least partially overlap with the first limiting protrusion protruding on the outer peripheral surface of the main body portion, the fixing part of the fixing member and the first limiting protrusion can share part of the space in the thickness direction of the wall portion. On the one hand, it can save the space jointly occupied by the fixing part and the first limiting protrusion in the thickness direction of the wall portion, which is beneficial to the size of the battery cell in the thickness direction of the wall portion. On the other hand, it can expand the size of the first limiting protrusion in the thickness direction of the wall portion, which is beneficial to improving the effect of the first limiting protrusion and the first limiting groove in cooperating to limit the electrode terminal and the first insulating member circumferentially.

[0022] In some embodiments, the fixing portion is disposed around the main body portion, the fixing portion defines an outlet hole for the main body portion to pass through along the thickness direction of the wall portion, and at least a portion of the first limiting protrusion is located in the outlet hole.

[0023] In the above technical solution, the fixing portion is an annular structure arranged around the main body portion, and the fixing portion defines a lead-out hole for the main body portion to pass through along the thickness direction of the wall portion. By setting at least a portion of the first limiting protrusion protruding on the outer circumferential surface of the main body portion to be located in the lead-out hole, the fixing portion and the first limiting protrusion of the fixing member can share part of the space in the thickness direction of the wall portion. On the one hand, the space jointly occupied by the fixing portion and the first limiting protrusion in the thickness direction of the wall portion can be saved, which is beneficial to the size of the battery cell in the thickness direction of the wall portion. On the other hand, the size of the first limiting protrusion in the thickness direction of the wall portion can be enlarged, which is beneficial to improving the effect of the first limiting protrusion and the first limiting groove cooperating to limit the electrode terminal and the first insulating member circumferentially.

[0024] 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.

[0025] 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 fixing part of the fixing member, 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 member located between the first limiting protrusion and the fixing part being too small.

[0026] 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 away from the wall portion, and the first limiting groove is provided on the third portion.

[0027] In the above technical solution, by connecting the first limiting protrusion to the side of the assembly portion in the thickness direction of the wall portion away from the wall portion, and correspondingly setting the first limiting groove on the third 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, since the projection of the fixing portion of the fixing member in the thickness direction of the wall portion does not overlap with the electrode terminal, the first limiting protrusion in the thickness direction of the wall portion can utilize the space occupied by the fixing portion, so that the fixing portion and the first limiting protrusion can share part of the space, which is beneficial to optimize the size of the battery cell in the thickness direction of the wall portion.

[0028] In some embodiments, the fixing member is arranged around the electrode terminal; wherein, one of the fixing portion 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 fixing parts of the first insulating member and the fixing member is provided with a second limiting protrusion, and the other is provided with a second limiting groove, so that the second limiting protrusion is inserted into the second limiting groove to achieve circumferential locking between the fixing member and the first insulating member, 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 fixing portion 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 fixing part of the fixing member, correspondingly, the second limiting protrusion is set on the first insulating member. The battery cell adopting this structure is convenient for setting the second limiting groove on the fixing part and facilitating the second limiting protrusion of the first insulating member to be assembled 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 fixing part, so that the second limiting protrusion does not occupy the space of the fixing part, 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 passes through both sides of the fixing portion, and the second limiting protrusion is convexly arranged on the outer peripheral surface of the first portion.

[0035] In the above technical solution, by setting the second limiting groove to pass through both sides of the fixing part in the thickness direction of the wall part, and setting the second limiting protrusion on the outer peripheral surface of the first part, on the one hand, the difficulty of setting the second limiting groove on the fixing part can be reduced, and the second limiting protrusion on the first insulating part 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 part and the fixing part.

[0036] In some embodiments, the fixing member further includes a connecting portion, wherein the connecting portion connects the wall portion and the fixing portion.

[0037] In the above technical solution, the fixing part is also provided with a connecting part, through which the fixing part and the wall part are connected, so as to realize a structure in which the fixing part and the wall part are arranged at intervals along the thickness direction of the wall part, thereby facilitating the coordinated assembly and restriction of the fixing part and the wall part, and reducing the difficulty of connection between the fixing part and the wall part.

[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 fixing portion; wherein the first connecting segment extends from the second connecting segment in a direction away from the electrode terminal, and the fixing portion 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 fixing portion, and the first connecting section and 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 member is in a "Z" shape. On the one hand, the structure of the fixing member can be optimized, which is conducive to reducing the difficulty of connecting the fixing member to the wall portion. On the other hand, it is convenient to arrange part of the first insulating member between the fixing portion and the wall portion, and the fixing member using such a structure can enhance the effect and stability of the fixing portion pressing the first insulating member 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 surrounds the outer side of 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 its circumferential direction to restrict and assemble the first insulating member, so that during the mutual assembly of the fixing member and the first insulating member, there is no need to position the fixing member or rotate the fixing member to adjust the angle, which is beneficial to reducing the difficulty of partially assembling the first insulating member between the wall portion and 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, the first insulating member also includes a fourth part; the fourth part is connected to the first part, and along the thickness direction of the wall portion, the fourth part is located on the side of the fixing portion away from the second part, and the fourth part and the second part are configured to cooperate to clamp the fixing portion.

[0047] In the above technical solution, the first insulating member is also provided with a fourth part connected to the first part, and the fourth part is located on the side of the fixing part away from the second part in the thickness direction of the wall portion, so that at least part of the fixing part of the fixing member is a structure embedded in the first insulating member, so that the second part and the fourth part of the first insulating member can also clamp the fixing part of the fixing member in the thickness direction of the wall portion, thereby further improving 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, and further effectively reduce the risk of falling off between the first insulating member and the fixing member, which is beneficial to further improve the stability and reliability of the fixing part to assemble the electrode terminal to the wall portion through the first insulating member, and 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 that restricts the first insulating member on 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 first insulating member and the electrode terminal, which is beneficial to reduce the difficulty of assembling the first insulating member and 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 arranging the fixing member and the wall portion as a separate structure, it is helpful to reduce the difficulty of arranging the fixing member on the wall portion, facilitate the assembly of part of the first insulating member between the fixing portion of the fixing member and the wall portion, and facilitate the connection of the first insulating member with the electrode terminal. By arranging the fixing member and the wall portion as an integrally formed structure, the fixing member and the wall portion are an integral structure formed by an integral molding process, thereby improving the connection strength and connection stability between the fixing member and the wall portion, and improving the stability of the fixing portion of the fixing member and the wall portion in clamping and assembling the first insulating member, which is conducive to improving the reliability of assembling the electrode terminal on the wall portion.

[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 and the first insulating 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 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 5A partial enlarged view of the battery cell at A shown;

[0069] Figure 7 A schematic structural diagram of a first insulating member provided in some embodiments of the present application;

[0070] Figure 8 A partial cross-sectional view of a first insulating member provided in some embodiments of the present application;

[0071] Fig. 9 A top view of a fixing member and an electrode terminal after being assembled with each other provided in some embodiments of the present application;

[0072] Fig.10 A schematic diagram of the structure of electrode terminals provided in some embodiments of the present application;

[0073] Fig.11 A top view of an electrode terminal provided in some embodiments of the present application;

[0074] Fig.12 A cross-sectional view of an electrode terminal provided in some embodiments of the present application;

[0075] Fig.13 A partial cross-sectional view of a battery cell perpendicular to its thickness direction provided in some embodiments of the present application;

[0076] Fig.14 for Fig.13 A partial enlarged view of the battery cell at B shown;

[0077] Fig.15 A schematic diagram of the structure of a fixing member provided in some embodiments of the present application;

[0078] Fig.16 A cross-sectional view of a fixing member provided in some embodiments of the present application;

[0079] Fig.17 A top view of a fixing 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] Icons: 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-lead hole; 2312-second limiting groove; 232-connecting part; 2321-first connecting section; 2322-second connecting section; 24-electrode terminal; 241-body; 2411-first limiting protrusion; 242-assembly part; 243-first material layer; 244-second material layer; 25-first insulating member; 251-first part; 252-second part; 253-third part; 254-fourth part; 255-first limiting groove; 256-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; Y-first direction. 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 / 3 O2 (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 0.05O2) 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. In addition, the safety of the battery also needs to be considered.

[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 battery cells occupying more space, an embodiment of the present application provides a battery cell, the battery cell includes 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, and the fixing member includes a fixing portion, and the fixing portion and the wall portion are spaced apart along the thickness direction 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 includes a first part, a second part and a third part, the first part is arranged between the electrode terminal and the fixing member to insulate and isolate the electrode terminal and the fixing member, the second part and the third part are both connected to the first part, and along the thickness direction of the wall portion, the second part is located between the fixing portion and the wall portion, and a part of the electrode terminal is located between the third part and the wall portion. Along the thickness direction of the wall portion, the projection of the fixing portion does not overlap with the projection of the electrode terminal.

[0134] In a battery cell of this structure, a fixing member is connected to the wall portion, and the fixing member has a fixing portion spaced from the wall portion in the thickness direction of the wall portion, and a first insulating member is provided with a first portion for insulating and isolating the fixing member and the electrode terminal, and a second portion and a third portion connected to the first portion, and by arranging the second portion of the first insulating member between the wall portion and the fixing portion of the fixing member in the thickness direction of the wall portion, and arranging a portion of the electrode terminal between the third portion of the first insulating member and the wall portion in the thickness direction of the wall portion, the wall portion and the fixing portion of the fixing member can cooperate to assemble the first insulating member, so as to cooperate to limit the movement of the first insulating member in the thickness direction of the wall portion, and the first insulating member can further cooperate with the wall portion to limit the movement of the electrode terminal in the thickness direction of the wall portion, so as to realize the assembly of the electrode terminal on the wall portion, wherein the fixing portion of the fixing member is set to a structure in which the projection in the thickness direction of the wall portion does not overlap with the electrode terminal, so that the fixing portion is a structure through which the first insulating member is fixed. The structure of indirectly cooperating with the wall to assemble the electrode terminal, the battery cell adopting this structure can realize the assembly and fastening of the electrode terminal without extending part of the electrode terminal to between the fixing part and the wall part. On the one hand, the size of the first part of the first insulating member between the fixing part and the electrode terminal in the thickness direction of the wall part will not be limited and constrained by the fixing part, thereby improving the effect of the first insulating member in insulating and isolating the fixing part and the electrode terminal of the fixing member. On the other hand, the distance between the fixing part and the wall part will not be limited and constrained by the electrode terminal, and the distance between the fixing part and the wall part in the thickness direction of the wall part can be reduced to optimize the size of the fixing part in the thickness direction of the wall part, and the size of the electrode terminal in the thickness direction of the wall part can be optimized, thereby reducing the space occupied by the electrode terminal and the fixing part used to assemble the electrode terminal in the thickness direction of the wall part, thereby saving the space occupied by the battery cell in the thickness direction of the wall part, 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 , Figure 8 and Fig. 9 , 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 the structure of the first insulating member 25 provided in some embodiments of the present application. Figure 8 A partial cross-sectional view of a first insulating member 25 provided in some embodiments of the present application, Fig. 9A top view of the fixing member 23 and the electrode terminal 24 provided in some embodiments of the present application after being assembled with each other. The present application provides a battery cell 20, and the battery cell 20 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 spaced apart from 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 includes a first portion 251, a second portion 252 and a third portion 253. The first portion 251 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 second portion 252 and the third portion 253 are both connected to the first portion 251. Along the thickness direction X of the wall, the second portion 252 is located between the fixing portion 231 and the wall 211, and a portion of the electrode terminal 24 is located between the third portion 253 and the wall 211. The fixing portion 231 and the wall 211 are configured to cooperate to limit the movement of the first insulating member 25 along the thickness direction X of the wall, so as to further limit the movement of the electrode terminal 24 along the thickness direction X of the wall. Along the thickness direction X of the wall, the projection of the fixing portion 231 does not overlap with the projection of the electrode terminal 24.

[0147] The housing 21 can also be used to contain electrolytes, such as electrolytes. 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 4 In 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 fasten the first insulating member 25 to the wall portion 211 so as to indirectly fix the electrode terminal 24 to the wall portion 211. The first insulating member 25 serves to connect and insulate the fixing member 23 and the electrode terminal 24 so as to achieve insulation isolation and mutual connection between the electrode terminal 24 and the fixing member 23. The first insulating member 25 serves 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 so as to assemble the electrode terminal 24 on the wall portion 211.

[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] The first insulating member 25 includes a first portion 251 , a second portion 252 and a third portion 253 , that is, the first insulating member 25 includes at least three portions, namely the first portion 251 , the second portion 252 and the third portion 253 .

[0169] The first part 251 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. That is, the first part 251 of the first insulating member 25 can separate the electrode terminal 24 and the fixing member 23 to play the role of insulating and isolating the electrode terminal 24 and the fixing member 23.

[0170] Exemplarily, the first insulating member 25 may be made of various materials, such as rubber, silicone or plastic.

[0171] The second portion 252 and the third portion 253 are both connected to the first portion 251, that is, the first portion 251 of the first insulating member 25 is disposed between the electrode terminal 24 and the fixing member 23, and is respectively connected to the second portion 252 and the third portion 253. Figure 6 and Figure 8 In the radial direction of the electrode terminal 24 , the second portion 252 is connected to a side of the first portion 251 away from the electrode terminal 24 , and the third portion 253 is connected to a side of the first portion 251 facing the electrode terminal 24 .

[0172] Along the thickness direction X of the wall, the second portion 252 is located between the fixing portion 231 and the wall portion 211, that is, the portion of the first insulating member 25 located between the fixing portion 231 and the wall portion 211 in the thickness direction X of the wall is the second portion 252, so that the fixing portion 231 and the wall portion 211 are configured to cooperate to limit the movement of the second portion 252 along the thickness direction X of the wall to limit the movement of the first insulating member 25 along the thickness direction X of the wall, that is, in the thickness direction X of the wall, the second portion 252 of the first insulating member 25 is located between the fixing portion 231 and the wall portion 211, so that the fixing portion 231 and the wall portion 211 can cooperate to clamp the second portion 252 of the first insulating member 25, thereby fastening and limiting the first insulating member 25 to the wall portion 211, and further enabling the fixing portion 231 to indirectly cooperate with the wall portion 211 through the first insulating member 25 to fasten and limit the electrode terminal 24 to the wall portion 211.

[0173] A portion of the electrode terminal 24 is located between the third portion 253 and the wall portion 211, that is, a portion of the electrode terminal 24 extends between the third portion 253 of the first insulating member 25 and the wall portion 211, so that the third portion 253 and the wall portion 211 are configured to cooperate to limit the movement of the electrode terminal 24 along the thickness direction X of the wall portion so as to assemble the electrode terminal 24 onto the wall portion 211.

[0174] Among them, see Figure 6 As shown, the fixing portion 231 of the fixing member 23 and the wall portion 211 are used to cooperate and clamp the second portion 252 of the first insulating member 25 along the thickness direction X of the wall portion to fasten the first insulating member 25 to the wall portion 211. Correspondingly, the electrode terminal 24 has an assembly portion 242 extending between the third portion 253 of the first insulating member 25 and the wall portion 211. That is, in the thickness direction X of the wall portion, the wall portion 211 and the third portion 253 of the first insulating member 25 are respectively located on both sides of the assembly portion 242, so that the third portion 253 of the first insulating member 25 The projection of 253 in the thickness direction X of the wall at least partially overlaps with the projection of the assembly portion 242, and the projection of the wall 211 in the thickness direction X of the wall at least partially overlaps with the projection of the assembly portion 242, so that the clamping force applied by the fixing portion 231 to the second portion 252 of the first insulating member 25 can be indirectly applied to the assembly portion 242 of the electrode terminal 24 through the third portion 253 of the first insulating member 25, thereby achieving that the fixing portion 231 can indirectly press the electrode terminal 24 onto the wall 211 through the first insulating member 25.

[0175] Along the thickness direction X of the wall, the projection of the fixing portion 231 does not overlap with the projection of the electrode terminal 24, that is, the fixing portion 231 and 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 fixing portion 231 and the electrode terminal 24 do not cover each other in the thickness direction X of the wall.

[0176] It should be noted that the wall portion 211 and the assembly portion 242 may also be in direct contact or indirect contact, that is, the wall portion 211 may be a structure in which the assembly portion 242 of the electrode terminal 24 is fastened to the first insulating member 25 through other components. Figure 5 and Figure 6 As shown, the battery cell 20 may also include a second insulating member 27, which 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 wall portion 211 is a structure that contacts the assembly portion 242 through the second insulating member 27, and the wall portion 211 is a structure that fastens the assembly portion 242 of the electrode terminal 24 through the second insulating member 27 and the first insulating member 25, 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.

[0177] 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.

[0178] Exemplarily, the material of the second insulating member 27 may be rubber, silicone or plastic.

[0179] 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.

[0180] Exemplarily, the third insulating member 28 may be made of rubber, silicone or plastic.

[0181] 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.

[0182] exist Figure 3 and Figure 4In 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.

[0183] Among them, the battery cell 20 includes two fixing members 23, two first insulating members 25 and two second insulating members 27. The fixing members 23, the first insulating members 25 and the second insulating members 27 are arranged one by one with the electrode terminals 24. Each electrode terminal 24 is fastened to the wall portion 211 through a fixing member 23. A first insulating member 25 is arranged between each electrode terminal 24 and a fixing member 23, and a second insulating member 27 is arranged between each electrode terminal 24 and the wall portion 211.

[0184] 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.

[0185] 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.

[0186] 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 .

[0187] 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.

[0188] In this embodiment, the wall portion 211 is connected to the fixing member 23, and the fixing member 23 has a fixing portion 231 spaced apart from the wall portion 211 in the thickness direction X of the wall portion. The first insulating member 25 is provided with a first portion 251 for insulating and isolating the fixing member 23 and the electrode terminal 24, and a second portion 252 and a third portion 253 connected to the first portion 251. By arranging the second portion 252 of the first insulating member 25 between the wall portion 211 and the fixing portion 231 of the fixing member 23 in the thickness direction X of the wall portion, the fixing of the wall portion 211 and the fixing member 23 is improved. The fixed portion 231 can cooperate with the first insulating member 25 to assemble, so as to cooperate with limiting the movement of the first insulating member 25 along the thickness direction X of the wall, and enable the first insulating member 25 to further cooperate with the wall 211 to limit the movement of the electrode terminal 24 along the thickness direction X of the wall, so as to realize the assembly of the electrode terminal 24 on the wall 211, wherein, by setting the fixed portion 231 of the fixing member 23 to a structure in which the projection in the thickness direction X of the wall does not overlap with the electrode terminal 24, the fixed portion 231 is indirectly cooperated with the wall 211 through the first insulating member 25 to assemble the electrode terminal The structure of the electrode terminal 24 is such that the battery cell 20 with such a structure can realize the assembly and fastening of the electrode terminal 24 without extending part of the electrode terminal 24 to between the fixing part 231 and the wall part 211. On the one hand, the size of the first part 251 of the first insulating member 25 located between the fixing part 231 and the electrode terminal 24 in the thickness direction X of the wall part will not be limited and constrained by the fixing part 231, thereby improving the effect of the first insulating member 25 insulating and isolating the fixing part 231 of the fixing member 23 and the electrode terminal 24. On the other hand, the fixing part 231 and the wall part 211 are connected to each other. The spacing between 211 will not be limited or constrained by the electrode terminal 24, and the spacing 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 used to assemble the electrode terminal 24 in the thickness direction X of the wall portion, so as to save 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.

[0189] According to some embodiments of the present application, referring to Figure 5 , Figure 6 , Figure 8 and Fig. 9 , and please refer to Fig.10 , Fig.10 A schematic diagram of the structure of the electrode terminal 24 provided in some embodiments of the present application. The electrode terminal 24 may include a body portion 241 and an assembly portion 242. The body portion 241 is electrically connected to the electrode assembly 22. The assembly portion 242 is convexly arranged on the outer peripheral surface of the body portion 241, and along the thickness direction X of the wall portion, the assembly portion 242 is located between the third portion 253 and the wall portion 211, and the wall portion 211 and the third portion 253 of the first insulating member 25 are used to cooperate to limit the movement of the electrode terminal 24 along the thickness direction X of the wall portion.

[0190] Among them, the main body 241 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 241 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 241 away from the electrode assembly 22 is used to be connected to the collecting component.

[0191] The assembly portion 242 is protruding from the outer circumference of the main body 241 , that is, the assembly portion 242 of the electrode terminal 24 is a structure connected to the outer circumference of the main body 241 and extends radially along the main body 241 so that the assembly portion 242 extends between the first insulating member 25 and the wall portion 211 .

[0192] It should be noted that, in other embodiments, the electrode terminal 24 may not be provided with the assembly portion 242. It is only necessary to lower the height of the main body portion 241 so that the outer peripheral surface of the main body portion 241 is located between the first insulating member 25 and the wall portion 211 to achieve the fixing portion 231 to clamp and restrict the part of the main body portion 241 through the first insulating member 25 and the wall portion 211.

[0193] Along the thickness direction X of the wall, the assembly portion 242 is located between the third portion 253 and the wall portion 211, that is, the third portion 253 of the first insulating member 25 is located on one side of the assembly portion 242 in the thickness direction X of the wall, and a portion of the wall portion 211 is located on the other side of the assembly portion 242 in the thickness direction X of the wall, so that the third portion 253 of the first insulating member 25 and the wall portion 211 can cooperate to clamp and limit the assembly portion 242 along the thickness direction X of the wall to assemble the electrode terminal 24 on the wall portion 211.

[0194] Exemplarily, the fixing portion 231 is an annular structure, and the fixing portion 231 surrounds the outer side of the main body portion 241, so that the fixing portion 231 defines a lead-out hole 2311, and the main body portion 241 of the electrode terminal 24 is penetrated in the lead-out hole 2311 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. In the embodiment in which the fixing portion 231 surrounds the outer side of the main body portion 241 of the electrode terminal 24, the first insulating member 25 is also an annular structure, and correspondingly, the first portion 251 of the first insulating member 25 is located between the electrode terminal 24 and the fixing member 23 in the radial direction of the fixing portion 231, and the first portion 251 is an annular structure surrounding the outer side of the electrode terminal 24, so as to realize that the first portion 251 insulates and separates the electrode terminal 24 and the fixing member 23, the second portion 252 of the first insulating member 25 is connected to the outer peripheral surface of the first portion 251, so that the second portion 252 can be located between the fixing portion 231 of the fixing member 23 and the wall portion 211 in the thickness direction X of the wall portion, and the third portion 253 of the first insulating member 25 is connected to the inner peripheral surface of the first portion 251, so that the third portion 253 can be located on the side of the assembly portion 242 away from the wall portion 211 in the thickness direction X of the wall portion.

[0195] In the present embodiment, the electrode terminal 24 includes a main body portion 241 and an assembly portion 242, and the assembly portion 242 of the electrode terminal 24 is a structure protruding from the outer peripheral surface of the main body portion 241. By setting the assembly portion 242 to be located between the third portion 253 and the wall portion 211, the assembly portion 242 extends to between the wall portion 211 and the third portion 253 of the first insulating member 25, so that the third portion 253 of the first insulating member 25 can cooperate with the wall portion 211 to limit the movement of the electrode terminal 24 along the thickness direction X of the wall, so that the fixing portion 231 can indirectly cooperate with the wall portion 211 in the thickness direction X of the wall through the first insulating member 25 to clamp and limit the assembly portion 242 of the electrode terminal 24, so as to realize the assembly of the electrode terminal 24 to the wall portion 211. The structure is simple and easy to assemble.

[0196] According to some embodiments of the present application, referring to Fig. 9 and Fig.10 , and please refer to Fig.11 and Fig.12 , Fig.11 A top view of an electrode terminal 24 provided in some embodiments of the present application, Fig.12 The sectional view of the electrode terminal 24 provided in some embodiments of the present application. The assembly portion 242 surrounds the outer side of the main body portion 241 .

[0197] The assembly portion 242 surrounds the outside of the main body 241, that is, the assembly portion 242 is an annular structure, and is disposed around the outer circumference of the main body 241. Of course, in other embodiments, the assembly portion 242 may also be a plurality of convex structures disposed on the outer circumference of the main body 241, and the plurality of convex structures are arranged at intervals along the circumference of the main body 241.

[0198] In this embodiment, by setting the assembly portion 242 as an annular structure surrounding the outer side of the main body portion 241, the assembly portion 242 can be clamped and restricted by the wall portion 211 and the first insulating member 25 at any circumferential position of the main body portion 241, 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 242 of the electrode terminal 24 between the wall portion 211 and the first insulating member 25, and helps to improve the stability and reliability of the electrode terminal 24 assembled on the wall portion 211.

[0199] According to some embodiments of the present application, see Figure 5 and Figure 6 As shown, along the first direction Y, the projection of the fixing portion 231 at least partially overlaps with the projection of the assembly portion 242 , and the first direction Y is perpendicular to the thickness direction X of the wall portion.

[0200] Among them, the first direction Y is a direction perpendicular to the thickness direction X of the wall portion. In an embodiment in which the fixing portion 231 is an annular structure, the first direction Y is a radial direction of the fixing portion 231. In an embodiment in which the assembly portion 242 is an annular structure surrounding the outer side of the main body portion 241, the first direction Y is a radial direction of the main body portion 241.

[0201] The projection of the fixing portion 231 overlaps at least partially with the projection of the assembly portion 242, that is, the fixing portion 231 and the assembly portion 242 share a portion of space in the thickness direction X of the wall, that is, the upper surface and / or lower surface of the fixing portion 231 in the thickness direction X of the wall is located between the upper surface and lower surface of the assembly portion 242 in the thickness direction X of the wall, or the upper surface and / or lower surface of the assembly portion 242 in the thickness direction X of the wall is located between the upper surface and lower surface of the fixing portion 231 in the thickness direction X of the wall. For example, Figure 6 In the embodiment, the upper surface of the fitting portion 242 in the thickness direction X of the wall portion is located between the upper surface and the lower surface of the fixing portion 231 in the thickness direction X of the wall portion.

[0202] In this embodiment, by setting the projection of the fixing portion 231 of the fixing member 23 in the direction perpendicular to the thickness direction X of the wall portion to overlap with at least part of the assembly portion 242 of the electrode terminal 24, the fixing portion 231 of the fixing member 23 and the assembly portion 242 of the electrode terminal 24 can share part of the space in the thickness direction X of the wall portion, thereby further optimizing the size of the fixing member 23 in the thickness direction X of the wall portion, and optimizing the size of the electrode terminal 24 in the thickness direction X of the wall portion, 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.

[0203] According to some embodiments of the present application, see Figure 5 , Figure 6 and Fig. 9 As shown, the fixing portion 231 is disposed around the main body 241 , and the fixing portion 231 defines an outlet hole 2311 for the main body 241 to pass through along the thickness direction X of the wall, and at least a portion of the assembly portion 242 is located in the outlet hole 2311 .

[0204] The fixing portion 231 is disposed around the main body 241 , that is, the fixing portion 231 is an annular structure, so that the lead-out hole 2311 is a through hole structure formed around the fixing portion 231 and extending along the thickness direction X of the wall.

[0205] exist Figure 6 and Fig. 9 In the embodiment, the main body 241 is inserted into the lead-out hole 2311 along the thickness direction X of the wall, and the main body 241 protrudes from a side of the fixing portion 231 away from the wall 211 in the thickness direction X of the wall.

[0206] At least part of the assembly portion 242 is located in the lead-out hole 2311, that is, the assembly portion 242 may be partially extended into the lead-out hole 2311, or the entire assembly portion 242 may be located in the lead-out hole 2311. Figure 6 In the embodiment, part of the fitting portion 242 extends into the lead-out hole 2311 along the thickness direction X of the wall portion.

[0207] In the present embodiment, the fixing portion 231 is an annular structure arranged around the main body portion 241, and the fixing portion 231 defines an extraction hole 2311 for the main body portion 241 to pass through along the thickness direction X of the wall portion. By setting at least a portion of the assembly portion 242 of the electrode terminal 24 for assembling and fastening the wall portion 211 and the first insulating member 25 to be located in the extraction hole 2311, the fixing portion 231 of the fixing member 23 and the assembly portion 242 of the electrode terminal 24 can share part of the space in the thickness direction X of the wall portion, thereby further optimizing the size of the fixing member 23 in the thickness direction X of the wall portion, and optimizing the size of the electrode terminal 24 in the thickness direction X of the wall portion, 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.

[0208] According to some embodiments of the present application, referring to Figure 7 , Figure 8 and Fig.10 , and please refer to Fig.13 and Fig.14 , Fig.13 A partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application perpendicular to its thickness direction, Fig.14 for Fig.13 A partial enlarged view of the B portion of the battery cell 20 is shown. One of the body portion 241 and the first insulating member 25 is provided with a first limiting protrusion 2411, and the other is provided with a first limiting groove 255, the first limiting protrusion 2411 is accommodated in the first limiting groove 255, and the first limiting groove 255 and the first limiting protrusion 2411 are configured to cooperate to limit the rotation of the electrode terminal 24 relative to the first insulating member 25.

[0209] Among them, the first limiting groove 255 and the first limiting protrusion 2411 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 2411 is inserted into the first limiting groove 255, it can achieve circumferential locking between the electrode terminal 24 and the first insulating member 25, so as 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.

[0210] For example, in Figure 7 , Figure 8 , Fig.10 and Fig.14In the embodiment, the first limiting protrusion 2411 is convexly provided on the outer circumference of the body portion 241 of the electrode terminal 24, and correspondingly, the first limiting groove 255 is provided on the inner circumference of the first insulating member 25. Of course, in other embodiments, the first limiting groove 255 may be provided on the outer circumference of the body portion 241, and correspondingly, the first limiting protrusion 2411 is convexly provided on the inner circumference of the first insulating member 25.

[0211] In this embodiment, by providing a first limiting protrusion 2411 on one of the main body 241 and the first insulating member 25, and providing a first limiting groove 255 on the other, the first limiting protrusion 2411 can be inserted into the first limiting groove 255 to achieve circumferential locking between the main body 241 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.

[0212] In some embodiments, see Fig.10 , Fig.11 and Fig.14 As shown, there are multiple first limiting protrusions 2411 , which are arranged at intervals along the circumference of the main body 241 , and the first limiting grooves 255 are correspondingly provided to the first limiting protrusions 2411 , and each first limiting groove 255 is used to accommodate a first limiting protrusion 2411 .

[0213] Exemplarily, a plurality of first limiting protrusions 2411 are convexly provided on the outer circumferential surface of the main body 241, and the plurality of first limiting protrusions 2411 are arranged at intervals along the circumference of the main body 241. Correspondingly, a plurality of first limiting grooves 255 are provided on the inner circumferential surface of the first insulating member 25, and the plurality of first limiting grooves 255 are arranged around the main body 241 so that each first limiting protrusion 2411 can be inserted into a first limiting groove 255.

[0214] Exemplarily, six first limiting protrusions 2411 are convexly provided on the outer circumferential surface of the main body 241, and correspondingly, six first limiting grooves 255 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 2411 and the first limiting grooves 255 can also be two, three, four, five or seven, etc.

[0215] In this embodiment, by providing a plurality of first limiting protrusions 2411, and the plurality of first limiting protrusions 2411 are arranged at intervals along the circumference of the main body 241, each first limiting protrusion 2411 is correspondingly inserted into a first limiting groove 255. 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.

[0216] In some embodiments, see Figure 7 , Fig.10 , Fig.12 and Fig.14 As shown, a first limiting protrusion 2411 is convexly provided on the outer circumferential surface of the main body 241 , and a first limiting groove 255 is provided on the first insulating member 25 .

[0217] The first limiting protrusion 2411 is convexly disposed on the outer circumference of the main body 241 , and the first limiting groove 255 is disposed on the inner circumference of the first insulating member 25 .

[0218] Optionally, the first limiting groove 255 may be disposed on the first portion 251 of the first insulating member 25 , or may be disposed on the second portion 252 of the first insulating member 25 .

[0219] In this embodiment, by protruding the first limiting protrusion 2411 on the outer peripheral surface of the main body 241 and setting the first limiting groove 255 on the first insulating member 25, the battery cell 20 adopting this structure does not need to be grooved on the main body 241 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.

[0220] According to some embodiments of the present application, see Fig.13 and Fig.14 As shown, along the first direction Y, the projection of the fixing portion 231 at least partially overlaps with the projection of the first limiting protrusion 2411 , and the first direction Y is perpendicular to the thickness direction X of the wall portion.

[0221] The first direction Y is a direction perpendicular to the thickness direction X of the wall portion. In an embodiment where the fixing portion 231 is an annular structure, the first direction Y is a radial direction of the fixing portion 231 .

[0222] The projection of the fixing portion 231 overlaps at least partially with the projection of the first limiting protrusion 2411, that is, the first limiting protrusion 2411 and the assembly portion 242 share part of the space in the thickness direction X of the wall, that is, the upper surface and / or lower surface of the fixing portion 231 in the thickness direction X of the wall is located between the upper surface and lower surface of the first limiting protrusion 2411 in the thickness direction X of the wall, or the upper surface and / or lower surface of the first limiting protrusion 2411 in the thickness direction X of the wall is located between the upper surface and lower surface of the fixing portion 231 in the thickness direction X of the wall. For example, Fig.14 In the embodiment, the upper surface and the lower surface of the first limiting protrusion 2411 in the thickness direction X of the wall portion are both located between the upper surface and the lower surface of the fixing portion 231 in the thickness direction X of the wall portion.

[0223] In this embodiment, by setting the projection of the fixing portion 231 of the fixing member 23 in the direction perpendicular to the thickness direction X of the wall portion to at least partially overlap with the first limiting protrusion 2411 protruding on the outer peripheral surface of the main body portion 241, the fixing portion 231 of the fixing member 23 and the first limiting protrusion 2411 can share part of the space in the thickness direction X of the wall portion, thereby, on the one hand, saving the space jointly occupied by the fixing portion 231 and the first limiting protrusion 2411 in the thickness direction X of the wall portion, which is beneficial to the size of the battery cell 20 in the thickness direction X of the wall portion, and on the other hand, expanding the size of the first limiting protrusion 2411 in the thickness direction X of the wall portion, which is beneficial to improving the effect of the first limiting protrusion 2411 and the first limiting groove 255 cooperating to limit the electrode terminal 24 and the first insulating member 25 circumferentially.

[0224] According to some embodiments of the present application, see Figure 6 , Fig. 9 and Fig.14 As shown, the fixing portion 231 is disposed around the main body 241 , and defines an outlet hole 2311 for the main body 241 to pass through along the thickness direction X of the wall, and at least a portion of the first limiting protrusion 2411 is located in the outlet hole 2311 .

[0225] The fixing portion 231 is disposed around the main body 241 , that is, the fixing portion 231 is an annular structure, so that the lead-out hole 2311 is a through hole structure formed around the fixing portion 231 and extending along the thickness direction X of the wall.

[0226] exist Figure 6 In the embodiment, the main body 241 is inserted into the lead-out hole 2311 along the thickness direction X of the wall, and the main body 241 protrudes from a side of the fixing portion 231 away from the wall 211 in the thickness direction X of the wall.

[0227] At least a portion of the first limiting protrusion 2411 is located in the lead-out hole 2311, that is, the first limiting protrusion 2411 may be partially extended into the lead-out hole 2311, or may be entirely located in the lead-out hole 2311. Figure 6 and Fig.14 As shown, the entire first limiting protrusion 2411 is located in the lead-out hole 2311 .

[0228] In the present embodiment, the fixing portion 231 is an annular structure arranged around the main body portion 241, and the fixing portion 231 defines an outlet hole 2311 for the main body portion 241 to pass through along the thickness direction X of the wall portion. By setting at least a portion of the first limiting protrusion 2411 protruding on the outer peripheral surface of the main body portion 241 to be located in the outlet hole 2311, the fixing portion 231 and the first limiting protrusion 2411 of the fixing member 23 can share part of the space in the thickness direction X of the wall portion, thereby, on the one hand, saving the space jointly occupied by the fixing portion 231 and the first limiting protrusion 2411 in the thickness direction X of the wall portion, which is beneficial to the size of the battery cell 20 in the thickness direction X of the wall portion, and on the other hand, expanding the size of the first limiting protrusion 2411 in the thickness direction X of the wall portion, which is beneficial to improving the effect of the first limiting protrusion 2411 and the first limiting groove 255 cooperating to limit the electrode terminal 24 and the first insulating member 25 in the circumferential direction.

[0229] According to some embodiments of the present application, see Fig.10 , Fig.11 , Fig.12 and Fig.14 As shown, the dimension of the first limiting protrusion 2411 protruding from the outer circumference of the main body 241 is smaller than the dimension of the assembly portion 242 protruding from the outer circumference of the main body 241. In other words, the length of the first limiting protrusion 2411 protruding in the radial direction of the main body 241 is smaller than the length of the assembly portion 242 protruding in the radial direction of the main body 241, so that the projection of the first limiting protrusion 2411 in the thickness direction X of the wall is located between the outer circumference of the main body 241 and the outer circumference of the assembly portion 242.

[0230] In this embodiment, by setting the dimension of the first limiting protrusion 2411 protruding from the outer circumferential surface of the main body 241 to be smaller than the dimension of the assembly portion 242 protruding from the outer circumferential surface of the main body 241, it is helpful to alleviate the interference between the first limiting protrusion 2411 and the fixing portion 231 of the fixing member 23, and can save the space occupied by the first limiting protrusion 2411 in the radial direction of the main body 241, 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 2411 and the fixing portion 231 being too small.

[0231] According to some embodiments of the present application, see Figure 8 , Fig.10, Fig.12 and Fig.14 As shown, along the thickness direction X of the wall portion, the first limiting protrusion 2411 is connected to the assembly portion 242, and the first limiting protrusion 2411 is located on the side of the assembly portion 242 away from the wall portion 211, and the first limiting groove 255 is provided on the third portion 253 of the first insulating member 25. In other words, the first limiting protrusion 2411 is connected to the surface of the assembly portion 242 on the side away from the wall portion 211 in the thickness direction X of the wall portion, so that the first limiting protrusion 2411 is a structure protruding on the side of the assembly portion 242 away from the wall portion 211.

[0232] In the implementation where the first insulating member 25 is an annular structure disposed around the electrode terminal 24 , the first limiting groove 255 is disposed on the inner circumferential surface of the third portion 253 of the first insulating member 25 .

[0233] In this embodiment, by connecting the first limiting protrusion 2411 to the side of the assembly portion 242 that is away from the wall portion 211 in the thickness direction X of the wall portion, and correspondingly setting the first limiting groove 255 on the third portion 253, on the one hand, the difficulty of setting the first limiting groove 255 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, since the projection of the fixing portion 231 of the fixing member 23 in the thickness direction X of the wall portion does not overlap with the electrode terminal 24, the first limiting protrusion 2411 in the thickness direction X of the wall portion can utilize the space occupied by the fixing portion 231, so that the fixing portion 231 and the first limiting protrusion 2411 can share part of the space, which is beneficial to optimize the size of the battery cell 20 in the thickness direction X of the wall portion.

[0234] According to some embodiments of the present application, referring to Figure 7 , Figure 8 and Fig.14 , and please refer to Fig.15 , Fig.16 and Fig.17 , Fig.15 This is a schematic diagram of the structure of the fixing member 23 provided in some embodiments of the present application. Fig.16 A cross-sectional view of a fixing member 23 provided in some embodiments of the present application, Fig.17 A top view of a fixing member 23 provided in some embodiments of the present application. The fixing member 23 is arranged around the electrode terminal 24. One of the fixing portion 231 and the first insulating member 25 is provided with a second limiting groove 2312, and the other is provided with a second limiting protrusion 256, and the second limiting protrusion 256 is accommodated in the second limiting groove 2312. The second limiting protrusion 256 and the second limiting groove 2312 are configured to cooperate to limit the fixing member 23 from rotating relative to the first insulating member 25.

[0235] 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 .

[0236] The second limiting protrusion 256 and the second limiting groove 2312 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 256 is inserted into the second limiting groove 2312, 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.

[0237] Exemplarily, the second limiting protrusion 256 is convexly provided on the outer circumference of the first insulating member 25, and correspondingly, the second limiting groove 2312 is provided on the inner circumference of the fixing portion 231 of the fixing member 23. Of course, in other embodiments, the second limiting groove 2312 may be provided on the outer circumference of the first insulating member 25, and correspondingly, the second limiting protrusion 256 is convexly provided on the inner circumference of the fixing portion 231 of the fixing member 23.

[0238] 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 fixing portion 231 of the fixing member 23 is provided with a second limiting protrusion 256, and the other is provided with a second limiting groove 2312, so that after the second limiting protrusion 256 is inserted into the second limiting groove 2312, 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.

[0239] In some embodiments, see Figure 7 , Fig.15 and Fig.17 As shown, there are multiple second limiting grooves 2312 , which are arranged at intervals along the circumference of the fixing member 23 , and the second limiting protrusions 256 are arranged corresponding to the second limiting grooves 2312 , and each second limiting groove 2312 is used to accommodate a second limiting protrusion 256 .

[0240] Exemplarily, a plurality of second limiting protrusions 256 are convexly provided on the outer circumferential surface of the first insulating member 25, and the plurality of second limiting protrusions 256 are arranged at intervals along the circumference of the first insulating member 25. Correspondingly, a plurality of second limiting grooves 2312 are provided on the fixing portion 231, and the plurality of second limiting grooves 2312 are arranged around the main body portion 241 so that each second limiting protrusion 256 can be inserted into a second limiting groove 2312.

[0241] Exemplarily, six second limiting grooves 2312 are provided on the fixing portion 231, and correspondingly, six second limiting protrusions 256 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 2312 and the second limiting protrusions 256 may also be two, three, four, five or seven, etc.

[0242] In this embodiment, a plurality of second limiting grooves 2312 are provided, and the plurality of second limiting grooves 2312 are arranged at intervals along the circumference of the fixing member 23, each second limiting groove 2312 is used for inserting a second limiting protrusion 256. The battery cell 20 adopting such a structure can further enhance the limiting effect of the circumferential locking 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.

[0243] In some embodiments, see Figure 7 , Figure 8 , Fig.14 , Fig.15 and Fig.16 As shown, the fixing portion 231 is provided with a second limiting groove 2312 , and the first insulating member 25 is provided with a second limiting protrusion 256 .

[0244] The second limiting groove 2312 is disposed on the inner circumference of the fixing portion 231 of the fixing member 23, and the second limiting protrusion 256 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 241, and the fixing portion 231 defines the lead-out hole 2311, the second limiting groove 2312 is disposed on the hole wall surface of the lead-out hole 2311.

[0245] Optionally, the second limiting protrusion 256 may be disposed on the first portion 251 of the first insulating member 25 , or may be disposed on the second portion 252 of the first insulating member 25 .

[0246] In this embodiment, by setting the second limiting groove 2312 on the fixing portion 231 of the fixing member 23, correspondingly, the second limiting protrusion 256 is set on the first insulating member 25. The battery cell 20 adopting this structure is convenient for setting the second limiting groove 2312 on the fixing portion 231, and is convenient for assembling the second limiting protrusion 256 of the first insulating member 25 in the second limiting groove 2312, 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 256 on the fixing portion 231, so that the second limiting protrusion 256 does not occupy the space of the fixing portion 231, which is beneficial to alleviate the interference between the second limiting protrusion 256 and the electrode terminal 24.

[0247] According to some embodiments of the present application, see Fig.14 , Fig.15 , Fig.16 and Fig.17 As shown, along the thickness direction X of the wall portion, the second limiting groove 2312 passes through both sides of the fixing portion 231 , and the second limiting protrusion 256 is protruded on the outer peripheral surface of the first portion 251 .

[0248] Among them, along the thickness direction X of the wall, the second limiting groove 2312 passes through both sides of the fixing part 231, that is, the two ends of the second limiting groove 2312 in the thickness direction X of the wall extend to the surfaces of the fixing part 231 on both sides of the wall in the thickness direction X.

[0249] Exemplarily, the second limiting protrusion 256 is protruded on the outer peripheral surface of the first part 251 away from the third part 253, and one end of the second limiting protrusion 256 close to the third part 253 in the thickness direction X of the wall is connected to the third part 253.

[0250] Among them, see Fig. 9 As shown, along the circumference of the main body 241, the two opposite side surfaces of the first limiting protrusion 2411 are located between the two opposite groove side surfaces of the second limiting groove 2312, so that the first limiting protrusion 2411 is a structure corresponding to the second limiting groove 2312, thereby being able to further alleviate the interference phenomenon between the first limiting protrusion 2411 and the fixing portion 231, and being able to increase the thickness of the portion of the first insulating member 25 located between the fixing portion 231 and the first limiting protrusion 2411, 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.

[0251] It should be noted that, in other embodiments, the second limiting groove 2312 may also be a structure that is only arranged on the inner circumferential surface of the fixing portion 231 and does not penetrate through both sides of the fixing portion 231 in the thickness direction X of the wall portion. Of course, the second limiting groove 2312 may also be a structure that only penetrates through one side of the fixing portion 231 in the thickness direction X of the wall portion.

[0252] In this embodiment, by setting the second limiting groove 2312 to pass through both sides of the fixing portion 231 in the thickness direction X of the wall portion, and setting the second limiting protrusion 256 on the outer peripheral surface of the first portion 251, on the one hand, the difficulty of setting the second limiting groove 2312 on the fixing portion 231 can be reduced, and the second limiting protrusion 256 on the first insulating member 25 can be easily assembled into the second limiting groove 2312. On the other hand, the space of the second limiting groove 2312 for accommodating the second limiting protrusion 256 can be further increased, which is beneficial to improving the limiting effect between the first insulating member 25 and the fixing member 23.

[0253] According to some embodiments of the present application, see Figure 6 , Fig.15 and Fig.16 As shown, the fixing member 23 may further include a connecting portion 232 , and the connecting portion 232 connects the wall portion 211 and the fixing portion 231 .

[0254] 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. Fig.15 and Fig.16 In 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.

[0255] 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.

[0256] In this 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 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 fitting and limiting of the first insulating member 25 between the fixing portion 231 and the wall portion 211, and reducing the difficulty of connection between the fixing member 23 and the wall portion 211.

[0257] In some embodiments, see Figure 6 , Fig.15 and Fig.16 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 fixing portion 231. The first connecting segment 2321 extends from the second connecting segment 2322 in a direction away from the electrode terminal 24, and the fixing portion 231 extends from the second connecting segment 2322 in a direction close to the electrode terminal 24.

[0258] The second connection segment 2322 of the connection portion 232 is connected between the first connection segment 2321 and the fixing portion 231 , and one end of the second connection segment 2322 is connected to the first connection segment 2321 , and the other end is connected to an end of the fixing portion 231 away from the electrode terminal 24 .

[0259] 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 in a radial direction of the body portion 241 away from the second connection segment 2322 .

[0260] The fixing portion 231 extends from the second connection segment 2322 toward the electrode terminal 24 . That is, the fixing portion 231 is a structure extending from one end connected to the second connection segment 2322 along the radial direction of the body portion 241 away from the second connection segment 2322 .

[0261] 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 fixing portion 231, and the inner circumference of the fixing portion 231 is arranged facing the outer circumference of the main body portion 241.

[0262] Exemplarily, the first connecting section 2321 and the second connecting section 2322 of the connecting portion 232 are an integrally formed structure.

[0263] Exemplarily, the first connecting section 2321 is connected to the wall portion 211 by welding.

[0264] In this embodiment, the connecting portion 232 includes a first connecting section 2321 and a second connecting section 2322 which 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 fixing portion 231. The first connecting section 2321 and 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 can optimize the structure of the fixing member 23 on the one hand, which is conducive to reducing the difficulty of connecting the fixing member 23 to the wall portion 211. On the other hand, it is convenient to set part of the first insulating member 25 between the fixing portion 231 and the wall portion 211. The fixing member 23 with such a structure can improve the effect and stability of the fixing portion 231 pressing the first insulating member 25 against the wall portion 211.

[0265] 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 .

[0266] 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 .

[0267] 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.

[0268] 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.

[0269] 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 241 abuts against the groove side surface of the assembly groove 2112.

[0270] 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 .

[0271] 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.

[0272] According to some embodiments of the present application, see Figure 6 , Fig. 9 , Fig.15 and Fig.16 As shown, the fixing portion 231 surrounds the outer side of the electrode terminal 24. In other words, the fixing portion 231 is an annular structure surrounding the outer side of the body portion 241 of the electrode terminal 24.

[0273] Among them, the fixing portion 231 is arranged around the main body portion 241, and the fixing portion 231 defines a lead-out hole 2311. Along the thickness direction X of the wall portion, the main body portion 241 of the electrode terminal 24 is inserted into the lead-out hole 2311, and one end of the main body portion 241 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 241 of the electrode terminal 24 protruding from the fixing portion 231 is used to be connected to the busbar component.

[0274] 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 restrict and assemble the first insulating member 25, so that during the mutual assembly of the fixing member 23 and the first insulating member 25, there is no need to position the fixing member 23 or rotate the fixing member 23 to adjust the angle, which is conducive to reducing the difficulty of partially assembling the first insulating member 25 between the wall portion 211 and the fixing portion 231, and is conducive to improving the stability and reliability of the electrode terminal 24 assembled on the wall portion 211.

[0275] According to some embodiments of the present application, see Figure 6 , Figure 7 and Figure 8 As shown, the first insulating member 25 may further include a fourth portion 254. The fourth portion 254 is connected to the first portion 251, and along the thickness direction X of the wall, the fourth portion 254 is located on the side of the fixing portion 231 away from the second portion 252, and the fourth portion 254 and the second portion 252 are configured to cooperate with the fixing portion 231 to clamp.

[0276] Among them, the fourth part 254 is connected to the side of the first part 251 away from the third part 253 in the first direction Y. In an embodiment in which the first insulating member 25 is an annular structure surrounding the outer side of the electrode terminal 24, the fourth part 254 is connected to the outer peripheral surface of the first part 251 away from the third part 253. Correspondingly, the third part 253 is connected to the inner peripheral surface of the first part 251.

[0277] That is, the second portion 252 and the fourth portion 254 of the first insulating member 25 are respectively located on both sides of the fixing portion 231 in the thickness direction X of the wall portion, so that at least part of the fixing portion 231 is embedded in the first insulating member 25.

[0278] For example, in Figure 7 and Figure 8In the embodiment in which the first insulating member 25 is provided with a second limiting protrusion 256 and the second limiting protrusion 256 is protruded on the outer peripheral surface of the first part 251, the two ends of the second limiting protrusion 256 in the thickness direction X of the wall portion can be respectively connected to the second part 252 and the fourth part 254.

[0279] For example, in Figure 7 and Figure 8 In the embodiment, the first part 251, the second part 252, the third part 253 and the fourth part 254 of the first insulating member 25 are an integrally formed structure, and the first part 251, the second part 252, the third part 253 and the fourth part 254 can be formed by an injection molding process. Of course, in other embodiments, the first part 251, the second part 252, the third part 253 and the fourth part 254 can also be a separately arranged structure, and the second part 252, the third part 253 and the fourth part 254 can be connected to the first part 251 by structures such as bonding.

[0280] For example, in Figure 7 In the embodiment, the first portion 251, the second portion 252, the third portion 253 and the fourth portion 254 of the first insulating member 25 are all annular structures.

[0281] In the present embodiment, the first insulating member 25 is further provided with a fourth portion 254 connected to the first portion 251, and the fourth portion 254 is located on the side of the fixing portion 231 away from the second portion 252 in the thickness direction X of the wall portion, so that at least a portion of the fixing portion 231 of the fixing member 23 is a structure embedded in the first insulating member 25, so that the second portion 252 and the fourth portion 254 of the first insulating member 25 can also clamp the fixing portion 231 of the fixing member 23 in the thickness direction X of the wall portion, thereby further improving the connection strength between the fixing member 23 and the first insulating member 25, so as to improve the assembly stability and reliability between the fixing member 23 and the first insulating member, and further effectively reduce the risk of falling off between the first insulating member 25 and the fixing member 23, which is beneficial to further improve the stability and reliability of the fixing portion 231 assembling the electrode terminal 24 to the wall portion 211 through the first insulating member 25, and is beneficial to improving the assembly quality of the battery cell 20.

[0282] According to some embodiments of this application, see Figure 5 and Figure 6 as well as Fig.13 and Fig.14 As shown, along the thickness direction X of the wall portion, the fixing portion 231 is located on a side of the wall portion 211 away from the electrode assembly 22 .

[0283] 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.

[0284] 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 that restricts the first insulating member 25 on 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 first insulating member 25 and the electrode terminal 24, which is beneficial to reduce the difficulty of assembling the first insulating member 25 and the electrode terminal 24 on the wall portion 211.

[0285] According to some embodiments of the present application, see Figure 5 and Figure 6 as well as Fig.13 and Fig.14 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 .

[0286] Among them, the assembly portion 242 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 242 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.

[0287] Exemplarily, the material of the second insulating member 27 may be rubber, plastic, or silicone.

[0288] 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.

[0289] In some embodiments, see Figure 5 and Figure 6 as well as Fig.13 and Fig.14As 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.

[0290] 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.

[0291] 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.

[0292] 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 .

[0293] 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.

[0294] 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, facilitate the assembly of part of the first insulating member 25 between the fixing portion 231 of the fixing member 23 and the wall portion 211, and facilitate the connection of the first insulating member 25 with the electrode terminal 24.

[0295] 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.

[0296] 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 in clamping and assembling the first insulating member 25, thereby facilitating improving the reliability of the electrode terminal 24 being assembled on the wall portion 211.

[0297] 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.

[0298] Among them, the end cover 213 is a 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 fixing portion 231 of the fixing member 23 is a structure that cooperates with the end cover 213 of the shell 21 through the first insulating member 25 to clamp the assembly portion 242 of the electrode terminal 24.

[0299] 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 and the first insulating member 25, 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 to the electrode assembly 22, which is beneficial to reducing the difficulty of assembling the electrode terminal 24 to the electrode assembly 22, thereby reducing the difficulty of assembling the battery cell 20 and improving the production efficiency of the battery cell 20.

[0300] It should be noted that the structure of the battery cell 20 is not limited thereto. In some 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 fixing portion 231 of the fixing member 23 is a structure in which the assembly portion 242 of the electrode terminal 24 is clamped and assembled by the first insulating member 25 and the bottom wall of the shell 212.

[0301] 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.

[0302] 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.

[0303] 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.

[0304] 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.

[0305] 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.

[0306] 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.

[0307] 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.

[0308] 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.

[0309] In some embodiments, 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 .

[0310] In which, in an embodiment where the electrode terminal 24 includes a main body portion 241 and an assembly portion 242, and the assembly portion 242 is protruded from the outer peripheral surface of the main body portion 241, the connection interface between the first material layer 243 and the second material layer 244 can be only on the main body portion 241, or on the main body portion 241 and the assembly portion 242.

[0311] 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 241 and the assembly part 242, that is, the main body 241 includes both the first material layer 243 and the second material layer 244, and the assembly part 242 also includes both the first material layer 243 and the second material layer 244.

[0312] 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.

[0313] 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.

[0314] Among them, see Figure 2 As shown, the battery 100 may further include a housing 10 , in which the battery cells 20 are accommodated.

[0315] 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 .

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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 .

[0320] 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.

[0321] 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.

[0322] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0323] 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 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 arranged 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 and connected to the side of the wall portion 211 away from the electrode assembly 22. Along the thickness direction X of the wall portion, the first connecting segment 2321 is spaced apart from the fixing portion 231, and the second connecting segment 2322 connects the first connecting segment 2321 and the fixing portion 231. The first connecting segment 2321 extends from the second connecting segment 2322 in a direction away from the electrode terminal 24, and the fixing portion 231 extends from the second connecting segment 2322 in a direction close to the electrode terminal 24. Along the thickness direction X of the wall, a mounting groove 2112 is provided on one side of the wall 211 facing the fixing portion 231. At least a portion of the first connecting section 2321 is accommodated in the mounting groove 2112. The first connecting section 2321 abuts against the bottom surface of the mounting groove 2112, and the first connecting section 2321 abuts against the side surface of the mounting groove 2112. The first insulating member 25 includes a first portion 251, a second portion 252, a third portion 253 and a fourth portion 254. The first portion 251 is provided between the electrode terminal 24 and the fixing member 23 to insulate and isolate the electrode terminal 24 and the fixing member 23. The first portion 251 is an annular structure surrounding the outer side of the electrode terminal 24. The second portion 252 and the fourth portion 254 are both connected to the outer circumference of the first portion 251. The third portion 253 is connected to the inner circumference of the first portion 251. The second portion 252, the third portion 253 and the fourth portion 254 are all annular structures.Along the thickness direction X of the wall, the second portion 252 is located between the fixing portion 231 and the wall portion 211, and part of the electrode terminal 24 is located between the third portion 253 and the wall portion 211. The fixing portion 231 and the wall portion 211 are configured to cooperate to limit the movement of the first insulating member 25 along the thickness direction X of the wall, so as to limit the movement of the electrode terminal 24 along the thickness direction X of the wall. The fourth portion 254 is located on the side of the fixing portion 231 away from the second portion 252 in the thickness direction X of the wall. The fourth portion 254 and the second portion 252 are configured to cooperate to clamp the fixing portion 231. Along the thickness direction X of the wall, the projection of the fixing portion 231 does not overlap with the projection of the electrode terminal 24. The electrode terminal 24 includes a body portion 241 and an assembly portion 242. The body portion 241 is inserted into the terminal hole 2111 along the thickness direction X of the wall portion, and the body portion 241 is electrically connected to the electrode assembly 22. The assembly portion 242 is convexly arranged on the outer peripheral surface of the body portion 241 and is arranged around the body portion 241. Along the thickness direction X of the wall portion, the assembly portion 242 is located between the third portion 253 and the wall portion 211. The wall portion 211 and the first insulating member 25 are used to cooperate to limit the movement of the electrode terminal 24 along the thickness direction X of the wall portion. The fixing portion 231 is arranged around the body portion 241, and the fixing portion 231 defines a lead-out hole 2311 for the body portion 241 to pass through along the thickness direction X of the wall portion. At least part of the assembly portion 242 is located in the lead-out hole 2311. A plurality of first limiting protrusions 2411 are convexly provided on the outer circumference of the body portion 241, and at least a portion of the first limiting protrusions 2411 is located in the lead-out hole 2311. A plurality of first limiting grooves 255 are provided on the inner circumference of the third portion 253 of the first insulating member 25. The plurality of first limiting protrusions 2411 are arranged at intervals along the circumference of the body portion 241, and the first limiting grooves 255 are provided corresponding to the first limiting protrusions 2411. Each first limiting groove 255 is used to accommodate a first limiting protrusion 2411, and the first limiting grooves 255 and the first limiting protrusions 2411 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 2411 protruding from the outer circumference of the body portion 241 is smaller than the dimension of the assembly portion 242 protruding from the outer circumference of the body portion 241. Along the thickness direction X of the wall portion, the first limiting protrusion 2411 is connected to the assembly portion 242, and the first limiting protrusion 2411 is located on the side of the assembly portion 242 away from the wall portion 211. A plurality of second limiting grooves 2312 are provided on the inner circumferential surface of the fixing portion 231, and the second limiting grooves 2312 penetrate both sides of the fixing portion 231 along the thickness direction X of the wall portion. A plurality of second limiting protrusions 256 are provided on the outer circumferential surface of the first portion 251 of the first insulating member 25, and the plurality of second limiting grooves 2312 are arranged at intervals along the circumferential direction of the fixing member 23, and the second limiting protrusions 256 are correspondingly arranged with the second limiting grooves 2312, and each second limiting groove 2312 is used to accommodate a second limiting protrusion 256, and the second limiting protrusion 256 and the second limiting groove 2312 are configured to cooperate to limit the fixing member 23 from rotating relative to the first insulating member 25.The current collecting member 26 is disposed in the housing 21 and is located between the wall portion 211 and the electrode assembly 22. A protrusion 261 is convexly provided on the side of the current collecting member 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 body portion 241 of the electrode terminal 24. The side of the current collecting member 26 facing away from the wall portion 211 is welded to the tab 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 disposed 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 disposed around the terminal hole 2111. The second insulating member 27 is also configured to seal the gap between the wall portion 211 and the electrode terminal 24.

[0324] 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.

[0325] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: 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 spaced apart from the wall portion along a 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, comprising a first portion, a second portion and a third portion, wherein the first portion is disposed between the electrode terminal and the fixing member to insulate and isolate the electrode terminal and the fixing member, the second portion and the third portion are both connected to the first portion, and along the thickness direction of the wall portion, the second portion is located between the fixing portion and the wall portion, and a portion of the electrode terminal is located between the third portion and the wall portion; Wherein, along the thickness direction of the wall portion, the projection of the fixing portion does not overlap with the projection of the electrode terminal.

2. The battery cell according to claim 1, characterized in that: The electrode terminal comprises: A main body portion, electrically connected to the electrode assembly; The assembly portion is protrudingly arranged on the outer peripheral surface of the main body portion, and is located between the third portion and the wall portion along the thickness direction of the wall portion.

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

4. The battery cell according to claim 2, characterized in that: Along a first direction, a projection of the fixing portion overlaps at least partially with a projection of the fitting portion, and the first direction is perpendicular to a thickness direction of the wall portion.

5. The battery cell according to claim 2, characterized in that: The fixing portion is arranged around the main body portion, and the fixing portion defines an outlet hole for the main body portion to pass through along the thickness direction of the wall portion, and at least a part of the assembly portion is located in the outlet hole.

6. The battery cell according to claim 2, 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.

7. The battery cell according to claim 6, 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.

8. The battery cell according to claim 6, 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.

9. The battery cell according to claim 8, characterized in that: Along a first direction, a projection of the fixing portion at least partially overlaps with a projection of the first limiting protrusion, and the first direction is perpendicular to a thickness direction of the wall portion.

10. The battery cell according to claim 8, characterized in that: The fixing portion is disposed around the main body portion, and the fixing portion defines an outlet hole for the main body portion to pass through along the thickness direction of the wall portion, and at least a portion of the first limiting protrusion is located in the outlet hole.

11. The battery cell according to claim 8, 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.

12. The battery cell according to claim 8, 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 away from the wall portion, and the first limiting groove is arranged on the third portion.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The fixing member is arranged around the electrode terminal; Among them, one of the fixing part 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, 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, characterized in that: The fixing portion 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, characterized in that: Along the thickness direction of the wall portion, the second limiting groove passes through two sides of the fixing portion, and the second limiting protrusion is convexly arranged on the outer peripheral surface of the first portion.

17. The battery cell according to claim 1, characterized in that: The fixing member further includes a connecting portion, and the connecting portion connects the wall portion and the fixing portion.

18. The battery cell according to claim 17, 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 fixing portion; The first connecting section extends from the second connecting section in a direction away from the electrode terminal, and the fixing portion extends from the second connecting section in a direction close to the electrode terminal.

19. The battery cell according to claim 18, 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, 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, characterized in that: The fixing portion surrounds the outer side of the electrode terminal.

22. The battery cell according to claim 1, characterized in that: The first insulating member further comprises: The fourth part is connected to the first part. Along the thickness direction of the wall, the fourth part is located on the side of the fixing part away from the second part. The fourth part and the second part are configured to cooperate and clamp the fixing part.

23. The battery cell according to claim 1, 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, 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, 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, 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, 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, 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, characterized in that: Comprising the battery cell according to any one of claims 1-28.

30. An electrical device, 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.

Images