Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly, an electrode terminal, a fixing piece and a first insulating piece, the electrode assembly is housed within the housing. The electrode terminal is disposed on a wall portion of the housing and is electrically connected to the electrode assembly. The fixing piece is arranged on the peripheral side of the electrode terminal, the fixing piece comprises a base part and a limiting part, the base part is connected to the wall part, the limiting part is connected to the base part and extends in the direction close to the electrode terminal, and the limiting part is configured to limit the electrode terminal to move in the direction away from the electrode assembly in the thickness direction of the wall part. And at least part of the first insulating part is arranged between the electrode terminal and the limiting part. The thickness of the limiting part is smaller than that of the base part. Therefore, the space for accommodating the first insulating part between the limiting part and the electrode terminal can be enlarged while the connection strength requirement of the base part and the wall part of the fixing part is met, so that the creepage distance between the limiting part and the electrode terminal can be increased.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery device, 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, battery devices have high requirements in terms of performance and endurance. The battery cells of a battery device usually include a shell and an electrode assembly housed in the shell. In order to realize the input or output of electrical energy of the battery cell, the shell is also insulated and installed 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, existing battery cells are prone to risks such as short circuits during use, resulting in low reliability of the battery cells. Utility Model Content

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

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly, an electrode terminal, a fixing member and a first insulating member; the shell has a wall portion; the electrode assembly is accommodated in the shell; the electrode terminal is arranged on the wall portion, and the electrode terminal is electrically connected to the electrode assembly; the fixing member is arranged on the peripheral side of the electrode terminal, and the fixing member includes a base and a limiting portion, the base is connected to the wall portion, the limiting portion is connected to the base and extends in a direction close to the electrode terminal, and the limiting portion is configured to limit the electrode terminal from moving in a direction away from the electrode assembly along the thickness direction of the wall portion; at least a portion of the first insulating member is arranged between the electrode terminal and the limiting portion; wherein the thickness of the limiting portion is less than the thickness of the base.

[0005] In the above technical solution, a fixing part is connected to the wall of the shell, and the fixing part is provided with a base and a limiting part. The base is connected to the wall, and the limiting part is connected to the base and extends in a direction close to the electrode terminal, and at least a part of the first insulating part is arranged between the limiting part and the electrode terminal, so that the limiting part and the wall can cooperate to clamp and assemble the electrode terminal to limit the movement of the electrode terminal along the thickness direction of the wall in a direction away from the electrode assembly, thereby realizing the assembly and fixation of the electrode terminal on the wall, and the insulation isolation between the limiting part and the electrode terminal can also be achieved through the first insulating part, wherein, by using the fixing part to limit the assembly of the electrode The thickness of the limiting portion of the terminal is set to be smaller than the thickness of the base of the fixing member used to connect to the wall portion, so that while meeting the connection quality and connection strength requirements of the base of the fixing member and the wall portion, the space between the limiting portion and the electrode terminal for accommodating the first insulating member can be expanded, thereby increasing the thickness of the portion of the first insulating member arranged between the limiting portion and the electrode terminal to increase the creepage distance between the limiting portion and the electrode terminal, and thus effectively alleviating the short circuit phenomenon between the limiting portion and the electrode terminal during use, which is beneficial to reducing the short circuit risk of the battery cell during use, so as to improve the reliability of the battery cell.

[0006] In some embodiments, along a thickness direction of the wall portion, a portion of the electrode terminal is located between the limiting portion and the wall portion.

[0007] In the above technical solution, by setting part of the electrode terminal between the upper limit part and the wall part in the thickness direction of the wall part, the part of the limit part and the part of the wall part are respectively located on both sides of the part of the electrode terminal in the thickness direction of the wall part, thereby improving the effect of the limit part and the wall part in clamping and assembling the electrode assembly, thereby improving the effect of the limit part in limiting the movement of the electrode terminal along the thickness direction of the wall part away from the electrode assembly, and thereby improving the stability and reliability of the electrode terminal assembled to the wall part.

[0008] In some embodiments, along the thickness direction of the wall, a surface of the limiting portion facing the wall is farther away from the wall than a surface of the base facing the wall.

[0009] In the above technical solution, by setting the surface of the limiting portion facing the wall to be farther away from the wall than the surface of the base facing the wall, the portion of the electrode terminal located between the limiting portion and the wall can share part of the space with the fixing part in the thickness direction of the wall, thereby meeting the creepage distance between the electrode terminal and the limiting portion and the connection reliability between the base and the wall, and effectively saving the space jointly occupied by the fixing part and the electrode terminal in the thickness direction of the wall, thereby saving the space occupied by the battery cell in the thickness direction of the wall, and thus facilitating improving the energy density of the battery cell.

[0010] In some embodiments, along the thickness direction of the wall, the surface of the limiting portion facing away from the wall is farther away from the wall than the surface of the base facing away from the wall; wherein the fixing member further includes a connecting portion, which connects the base and the limiting portion.

[0011] In the above technical solution, the surface of the limiting portion facing away from the wall is farther away from the wall in the thickness direction of the wall than the surface of the base facing away from the wall, so that the limiting portion is a structure protruding from the side of the base facing away from the wall. By providing a connecting portion between the base and the limiting portion, on the one hand, it is beneficial to reduce the difficulty of connection between the base and the limiting portion, and can improve the connection stability between the base and the limiting portion. On the other hand, while achieving the limiting portion pressing the electrode terminal and meeting the connection quality between the base and the wall, there is no need to increase the thickness of the base in the thickness direction of the wall, which is beneficial to reducing the manufacturing cost of the fixing part and can reduce the weight of the fixing part.

[0012] In some embodiments, the limiting portion and the base portion are spaced apart along a thickness direction of the wall portion.

[0013] In the above technical solution, by setting the limiting portion and the base as a structure spaced apart from each other in the thickness direction of the wall portion, it is helpful to reduce the difficulty of partially assembling the electrode terminal between the limiting portion and the wall portion, and can reduce the difficulty of forming the connecting portion connecting the limiting portion and the base.

[0014] In some embodiments, along a direction perpendicular to the thickness direction of the wall portion, the base portion extends from the connecting portion in a direction away from the electrode terminal, and the limiting portion extends from the connecting portion in a direction close to the electrode terminal.

[0015] In the above technical solution, by setting the limiting portion as a structure extending from one side of the connecting portion toward the direction close to the electrode terminal, and setting the base portion as a structure extending from the other side of the connecting portion toward the direction away from the electrode terminal, the cross-section of the fixing member is made into a "Z"-shaped structure, which can optimize the structure of the fixing member on the one hand, and help reduce the difficulty of connecting the fixing member to the wall portion. On the other hand, it can reduce the interference between the base portion and the electrode terminal, and can reduce the phenomenon that the base portion occupies the space between the wall portion and the limiting portion, thereby facilitating the limiting portion and the wall portion to cooperate in clamping and assembling the electrode terminal, and is conducive to optimizing the space occupied by the fixing member and the electrode terminal in the thickness direction of the wall portion.

[0016] In some embodiments, in the same plane perpendicular to the thickness direction of the wall portion, an orthographic projection of the connecting portion and an orthographic projection of the electrode terminal do not overlap.

[0017] In the above technical solution, by setting the connecting part and the electrode terminal to a structure in which the projections in the thickness direction of the wall part do not overlap, the interference effect between the connecting part and the electrode terminal can be reduced, and the creepage distance between the connecting part and the electrode terminal can be increased, which is beneficial to reducing the risk of short circuit between the connecting part and the electrode terminal.

[0018] In some embodiments, the connecting portion includes a curved section and a straight section, the curved section is connected to the base, and the straight section is connected to the curved section along a direction perpendicular to the thickness direction of the wall portion and extends from the curved section toward the electrode terminal; wherein the surface of the straight section facing away from the wall portion is farther away from the wall portion in the thickness direction of the wall portion than the surface of the base facing away from the wall portion, and the limiting portion is connected to the end of the straight section facing the electrode terminal in a direction perpendicular to the thickness direction of the wall portion.

[0019] In the above technical solution, the connecting portion is provided with a curved section and a straight section connected to each other, the curved section is connected to the base, and the straight section extends from the curved section toward the electrode terminal in a direction perpendicular to the thickness direction of the wall, and the limiting portion is connected to the end of the straight section facing the electrode terminal, so that the surface of the limiting portion facing the wall and the surface of the straight section facing the wall can be farther away from the wall than the surface of the base facing the wall. The fixing part with such a structure, on the one hand, facilitates the connection between the connecting part and the limiting part, which is beneficial to reducing the difficulty of connection between the connecting part and the limiting part; on the other hand, it can improve the connection strength between the limiting part and the connecting part, so that the force of the limiting part pressing the electrode terminal is a structure acting on the straight section of the connecting part, which is beneficial to improving the overall structural strength of the fixing part and can improve the effect of the limiting part of the fixing part pressing the electrode terminal.

[0020] In some embodiments, along the thickness direction of the wall portion, the surface of the limiting portion facing the wall portion is farther away from the wall portion than the surface of the straight section facing the wall portion, so as to form a thinning groove on the side of the limiting portion facing the wall portion, and a portion of the first insulating member is accommodated in the thinning groove.

[0021] In the above technical solution, by setting the surface of the limiting portion facing the wall portion to be farther away from the wall portion in the thickness direction of the wall portion than the surface of the straight section facing the wall portion, a thinning groove can be formed on the side of the limiting portion facing the wall, and part of the first insulating member is accommodated in the thinning groove, so that the space between the limiting portion of the fixing member for assembling the electrode terminal and the electrode terminal can be expanded in the thickness direction of the wall portion, so that the first insulating member can meet the creepage distance between the electrode terminal and the limiting portion while also achieving the straight section of the connecting portion and the first insulating member sharing part of the space in the thickness direction of the wall, thereby reducing the fixing member, the first insulating member and the electrode terminal in the wall. The overall size occupied in the thickness direction of the part is reduced, so that the thickness of the portion of the first insulating part located between the limiting part and the electrode terminal along the thickness direction of the wall portion remains unchanged, and when the insulation isolation between the limiting part and the electrode terminal is satisfied, the distance between the limiting part and the wall portion in the thickness direction of the wall portion can be reduced to optimize the size of the fixing part 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 part for assembling the electrode terminal in the thickness direction of the wall portion, so as to save the space occupied by the battery cell in the thickness direction of the wall portion, which is beneficial to improving the energy density of the battery cell.

[0022] In some embodiments, along the thickness direction of the wall, the surface of the limiting portion facing away from the wall is closer to the wall than the surface of the straight section facing away from the wall, and a portion of the first insulating member is located on the side of the limiting portion facing away from the wall.

[0023] In the above technical solution, by setting the surface of the limiting portion facing away from the wall portion to be closer to the wall portion in the thickness direction of the wall portion than the surface of the straight section facing away from the wall portion, a thinning groove can be formed on the side of the limiting portion facing away from the wall portion, and part of the first insulating member is located on the side of the limiting portion facing away from the wall portion. Therefore, on the one hand, the first insulating member can be configured to cover at least part of the limiting portion, which is beneficial to further improve the insulation isolation effect between the limiting portion and the electrode terminal, and is beneficial to improving the assembly stability between the first insulating member and the fixing member. On the other hand, while improving the insulation isolation effect of the first insulating member between the limiting portion and the electrode terminal, it can also be achieved that the straight section of the connecting portion and the first insulating member share part of the space in the thickness direction of the wall portion, which is beneficial to optimize the space occupied by the fixing member and the first insulating member in the thickness direction of the wall portion, thereby effectively improving the space utilization rate of the battery cell.

[0024] In some embodiments, along the thickness direction of the wall portion, a surface of the limiting portion facing away from the wall portion is flush with a surface of the base portion facing away from the wall portion.

[0025] In the above technical solution, the surface of the limiting portion facing away from the wall and the surface of the base facing away from the wall are arranged to be coplanar, so that the fixing member is locally thinned on the side facing the wall to form a structure of the limiting portion, and the area of ​​the fixing member that is not thinned is the base, so that the thickness of the limiting portion is smaller than the thickness of the base, the structure is simple, and it is easy to manufacture, which is conducive to reducing the processing difficulty of the fixing member.

[0026] In some embodiments, along the thickness direction of the wall, the surface of the limiting portion facing away from the wall is closer to the wall than the surface of the base facing away from the wall, and part of the first insulating member is located on the side of the limiting portion facing away from the wall.

[0027] In the above technical solution, by setting the surface of the limiting portion facing away from the wall portion to be closer to the wall portion in the thickness direction of the wall portion than the surface of the base portion facing away from the wall portion, the side of the fixing member facing away from the wall portion is locally thinned, and part of the first insulating member is located on the side of the limiting portion facing away from the wall portion. Therefore, on the one hand, the first insulating member can be a structure that covers at least part of the limiting portion, which is beneficial to further improve the insulation isolation effect between the limiting portion and the electrode terminal, and is beneficial to improving the assembly stability between the first insulating member and the fixing member. On the other hand, while improving the insulation isolation effect of the first insulating member between the limiting portion and the electrode terminal, it can also be achieved that the base of the fixing member and the first insulating member share part of the space in the thickness direction of the wall portion, which is beneficial to optimize the space occupied by the fixing member and the first insulating member in the thickness direction of the wall portion, thereby effectively improving the space utilization rate of the battery cell.

[0028] In some embodiments, along the thickness direction of the wall portion, a surface of the limiting portion facing the wall portion is flush with a surface of the base portion facing the wall portion.

[0029] In the above technical solution, by arranging the surface of the limiting portion facing the wall and the surface of the base facing the wall into a coplanar structure, the fixing member is locally thinned on the side away from the wall to form a structure of the limiting portion, and the area of ​​the fixing member that is not thinned is the base, so that the thickness of the limiting portion is smaller than the thickness of the base, the structure is simple, and it is easy to manufacture, which is conducive to reducing the processing difficulty of the fixing member.

[0030] 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 a portion of the assembly portion is located between the limiting portion and the wall portion in the thickness direction of the wall portion; wherein, along a direction perpendicular to the thickness direction of the wall portion, the limiting portion is located between the base and the main body, and a portion of the first insulating member is located between the limiting portion and the outer peripheral surface of the main body.

[0031] In the above technical solution, the electrode terminal is provided with a main body portion and an assembly portion. The assembly portion of the electrode terminal is a structure protruding from the outer peripheral surface of the main body portion, and the limiting portion is located between the base portion and the main body portion in a direction perpendicular to the thickness direction of the wall portion, so as to facilitate extending the assembly portion between the wall portion and the limiting portion to realize that part of the electrode terminal is located between the wall portion and the limiting portion. The structure is simple and it is convenient for the wall portion and the limiting portion to cooperate to limit the assembly portion.

[0032] In some embodiments, the assembly portion surrounds the outer side of the main body portion.

[0033] In the above technical solution, by setting the assembly part as an annular structure surrounding the outer side of the main body, the wall part and the limiting part can be matched and clamped and restricted at any position of the assembly part in the circumferential direction of the main body, so that the electrode terminal does not need to be positioned or rotated to adjust the angle during the assembly of the electrode terminal, which is conducive to reducing the difficulty of assembling the assembly part of the electrode terminal between the wall part and the limiting part, and is conducive to improving the stability and reliability of the electrode terminal assembled on the wall part.

[0034] 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, and the first limiting protrusion is accommodated in the first limiting groove.

[0035] In the above technical solution, a first limiting protrusion is provided on one of the main body and the first insulating member, and a first limiting groove is provided on the other, so that the first limiting groove and the first limiting protrusion can cooperate to limit the rotation of the electrode terminal relative to the first insulating member, so as to realize circumferential locking between the main body and the first insulating member, which is conducive to alleviating 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.

[0036] 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 provided to the first limiting protrusions, and each first limiting groove is used to accommodate one first limiting protrusion.

[0037] 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 helping to further alleviate the phenomenon of the electrode terminal rotating relative to the first insulating member around the axis extending along the thickness direction of the wall.

[0038] In some embodiments, 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.

[0039] In the above technical solution, the first limiting protrusion is a structure protruding from the outer peripheral surface of the main body, and the first limiting groove is a structure arranged on the first insulating member. The battery cell adopting this structure does not need to be grooved on the main body of the electrode terminal, which is beneficial to improving the structural strength of the electrode terminal and improving the current-carrying capacity of the electrode terminal.

[0040] In some embodiments, a dimension of the first limiting protrusion protruding from the outer circumference of the main body is smaller than a dimension of the assembly portion protruding from the outer circumference of the main body.

[0041] 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 base of the fixing member, and can save the space occupied by the first limiting protrusion in the radial direction of the electrode terminal, so as to alleviate the phenomenon that the thickness of the part of the first insulating member located between the first limiting protrusion and the fixing member is too small, resulting in poor insulation effect.

[0042] In some embodiments, along the thickness direction of the wall portion, the first limiting protrusion is connected to the assembly portion, and the first limiting protrusion is located on a side of the assembly portion facing the limiting portion.

[0043] In the above technical solution, by connecting the first limiting protrusion to the side of the assembly part facing the limiting part in the thickness direction of the wall portion, on the one hand, the difficulty of setting the first limiting groove on the first insulating part can be reduced, and the difficulty of assembling between the electrode terminal and the first insulating part can be reduced. On the other hand, the first limiting protrusion can utilize the space between the assembly part and the limiting part in the thickness direction of the wall portion, and there is no need to increase the distance between the limiting part and the wall portion in order to avoid the first limiting protrusion, which is beneficial to saving the space occupied by the fixing part and the wall portion in the thickness direction of the wall portion, so as to optimize the size of the battery cell in the thickness direction of the wall portion.

[0044] In some embodiments, along the thickness direction of the wall portion, the first limiting protrusion and the limiting portion are spaced apart.

[0045] In the above technical solution, the first limiting protrusion and the limiting portion are arranged as a spaced-apart structure in the thickness direction of the wall portion to reduce the interference between the first limiting protrusion and the limiting portion, and a first insulating member can be arranged between the first limiting protrusion and the limiting portion to reduce the risk of short circuit between the first limiting protrusion and the fixing member.

[0046] In some embodiments, in the same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the first limiting protrusion does not overlap with the orthographic projection of the limiting portion.

[0047] In the above technical solution, by setting the first limiting protrusion and the limiting portion to a structure in which the projections in the thickness direction of the wall portion do not overlap, on the one hand, the interference effect between the first limiting protrusion and the fixing member can be reduced, and on the other hand, the risk of short circuit between the first limiting protrusion and the fixing member can be reduced.

[0048] In some embodiments, the fixing member is arranged around the electrode terminal; wherein, one of the limiting portion and the first insulating member is provided with a second limiting groove, and the other is provided with a second limiting protrusion, and the second limiting protrusion is accommodated in the second limiting groove.

[0049] In the above technical solution, the fixing member is provided as a structure arranged around the electrode terminal, and one of the first insulating member and the limiting portion is provided with a second limiting protrusion, and the other is provided with a second limiting groove, so that the second limiting protrusion and the second limiting groove can cooperate to limit the rotation of the fixing member relative to the first insulating member, so as to realize circumferential locking between the fixing member and the first insulating member, which is conducive to 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. 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.

[0050] In some embodiments, there are multiple second limiting grooves, and the multiple 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.

[0051] 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 limiting effect of the circumferential locking between the fixing member and the first insulating member, thereby helping to further alleviate the phenomenon of the fixing member rotating relative to the first insulating member around the axis extending along the thickness direction of the wall portion.

[0052] In some embodiments, the limiting portion is provided with the second limiting groove, and the first insulating member is provided with the second limiting protrusion.

[0053] In the above technical solution, by setting the second limiting groove on the limiting part and correspondingly setting the second limiting protrusion on the first insulating part, the battery cell adopting this structure is convenient for processing the second limiting groove on the limiting part and for assembling the second limiting protrusion of the first insulating part 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 limiting part, so that the second limiting protrusion will not occupy the space of the limiting part, which is beneficial to alleviating the interference between the second limiting protrusion and the electrode terminal.

[0054] In some embodiments, along the thickness direction of the wall portion, the second limiting groove passes through both sides of the limiting portion.

[0055] In the above technical solution, by setting the second limiting groove as a structure that passes through both sides of the limiting part in the thickness direction of the wall part, on the one hand, the difficulty of setting the second limiting groove on the limiting 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.

[0056] In some embodiments, the limiting portion is arranged around the electrode terminal so that the limiting portion encloses a lead-out hole; wherein, along the thickness direction of the wall portion, the electrode terminal is passed through the lead-out hole, and the electrode terminal extends out of the limiting portion on the side away from the wall portion.

[0057] In the above technical solution, by arranging the electrode terminal to be arranged in a structure that passes through the lead-out hole along the thickness direction of the wall portion and extends the limiting portion to the side away from the wall portion, it is convenient to assemble and connect the electrode terminal with other components, which is beneficial to reducing the difficulty of the electrode terminal outputting or inputting electrical energy into the battery cell. In addition, the thickness of the limiting portion is smaller than the thickness of the base portion, so that while meeting the connection requirements between the base portion and the wall portion, the size of the portion of the electrode terminal passing through the lead-out hole in the thickness direction of the wall portion can be reduced, which is beneficial to saving the space occupied by the fixing part and the wall portion in the thickness direction of the wall portion, so as to optimize the size of the battery cell in the thickness direction of the wall portion.

[0058] In some embodiments, the fixing member is separately provided from the wall portion.

[0059] In the above technical solution, by setting the fixing part and the wall part as a separate structure, it is helpful to reduce the difficulty of setting the fixing part on the wall part, and facilitate the assembly of the first insulating part between the fixing part and the electrode terminal, thereby helping to reduce the difficulty of assembling the battery cell.

[0060] In some embodiments, the base portion is connected to the wall portion by welding.

[0061] In the above technical solution, the base and the wall are connected by welding, which can effectively improve the connection stability and reliability between the base and the wall, and reduce the difficulty of assembly between the fixing part and the wall.

[0062] In some embodiments, the fixing member is integrally formed with the wall portion.

[0063] In the above technical solution, by arranging the fixing part and the wall portion as an integrally formed structure, the fixing part 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 part and the wall portion, thereby improving the stability of the electrode terminal assembled in cooperation with the limiting portion of the fixing part and the wall portion, and further facilitating the improvement of the reliability of the electrode terminal being assembled on the wall portion.

[0064] In some embodiments, the thickness of the limiting portion is D1, and the thickness of the base is D2, satisfying 0.3D2≤D1≤0.8D2.

[0065] In the above technical solution, by setting the ratio of the thickness of the limiting part to the thickness of the base to 0.3 to 0.8, on the one hand, the thickness of the limiting part is set to be greater than or equal to 0.3 times the thickness of the base to improve the structural strength of the limiting part, which is beneficial to reducing the phenomenon of breakage or deformation of the limiting part during use, thereby improving the stability and reliability of the electrode terminal assembled with the fixing part; on the other hand, the thickness of the limiting part is set to be less than or equal to 0.8 times the thickness of the base, so that while meeting the requirements of the connection quality and connection strength between the base and the wall of the fixing part, the space between the limiting part and the electrode terminal for accommodating the first insulating part can be further expanded, which is beneficial to further improve the thickness of the part of the first insulating part arranged between the limiting part and the electrode terminal, thereby increasing the creepage distance between the limiting part and the electrode terminal, and further alleviating the phenomenon of short circuit between the limiting part and the electrode terminal during use.

[0066] In some embodiments, the thickness of the limiting portion is D1, satisfying 0.5 mm ≤ D1 ≤ 1.5 mm.

[0067] In the above technical solution, by setting the thickness of the limiting part to 0.5mm to 1.5mm, on the one hand, the structural strength of the limiting part can be improved to reduce the risk of breakage or deformation of the limiting part during use; on the other hand, the space occupied by the limiting part can be saved, which is conducive to optimizing the overall dimensions of the fixing part, the first insulating part and the electrode terminal in the thickness direction of the wall portion, so as to improve the space utilization of the battery cell.

[0068] In some embodiments, at least a portion of the limiting portion is embedded in the first insulating member, and along the thickness direction of the wall portion, a portion of the first insulating member is located on a side of the limiting portion away from the wall portion.

[0069] In the above technical solution, by embedding at least a portion of the limiting portion of the fixing member in the first insulating member, and a portion of the first insulating member is located on the side of the limiting member away from the wall portion, the first insulating member is made to be a structure covering at least a portion of the outer side of the limiting member, thereby further improving the connection strength between the fixing member and the first insulating member, thereby improving the assembly stability and reliability between the fixing member and the first insulating member, and further reducing the risk of falling off between the first insulating member and the fixing member, which is beneficial to improving the assembly quality of the battery cell.

[0070] 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 limiting portion, and at least a portion of the base portion is accommodated in the mounting groove.

[0071] In the above technical solution, an assembly groove for accommodating the base is provided on the side of the wall portion facing the limiting portion, so that at least a portion of the base 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, and can reduce the difficulty of assembly between the wall portion and the base of the fixing member.

[0072] In some embodiments, the base abuts against a bottom surface of the assembly slot, and the base abuts against a side surface of the assembly slot.

[0073] In the above technical solution, by setting the base of the fixing part to a structure that abuts against the bottom and side surfaces of the assembly groove, the assembly groove can also play a role in limiting and positioning the base of the fixing part. On the one hand, it can improve the accuracy of the fixing part being assembled on the wall and reduce the difficulty of connecting the fixing part to the wall. On the other hand, it can further improve the structural stability and reliability of the fixing part being assembled on the wall.

[0074] In some embodiments, the fixing member is disposed around the electrode terminal.

[0075] In the above technical solution, by setting the fixing part as an annular structure arranged around the electrode terminal, the fixing part can cooperate with the wall portion to assemble the electrode terminal at any position in its circumferential direction, so that the fixing part does not need to be positioned or rotated to adjust the angle during the mutual assembly of the fixing part and the electrode terminal, which is conducive to reducing the difficulty of assembly between the fixing part and the wall portion and between the fixing part and the electrode terminal, and is conducive to improving the stability and reliability of the electrode terminal assembled on the wall portion.

[0076] In some embodiments, along a thickness direction of the wall portion, the base portion is connected to a side of the wall portion facing away from the electrode assembly.

[0077] In the above technical solution, by setting the base of the fixing member to a structure connected to the side of the wall portion facing away from the electrode assembly, the fixing member is a structure connected to the side of the wall portion facing away from the electrode assembly, and the limiting portion of the fixing member is a structure for assembling the electrode terminal to the wall portion from the side of the wall portion facing away from the electrode assembly. The battery cell adopting this structure can, on the one hand, reduce the difficulty of connecting the fixing member and the wall portion, and on the other hand, facilitate the assembly of the electrode terminal, which is beneficial to reducing the difficulty of assembling the electrode terminal on the wall portion.

[0078] In some embodiments, the battery cell further includes a second insulating member; 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.

[0079] 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.

[0080] In some embodiments, the wall portion is provided with a terminal hole, and the terminal hole passes through 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.

[0081] In the above technical solution, a terminal hole for inserting the electrode terminal is also provided on the wall portion, so that the electrode terminal can be electrically connected to the electrode assembly contained in the outer shell. By setting the second insulating member to 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.

[0082] In some embodiments, the fixing member includes a first material layer and a second material layer connected to each other, a portion of the first material layer is located within the base, and the portion of the first material layer located within the base is connected to the wall portion; wherein, at least a portion of the second material layer is located within the limiting portion, and the hardness of the second material layer is greater than the hardness of the first material layer.

[0083] In the above technical solution, by setting the fixing part to a composite structure including a first material layer and a second material layer and the hardness of the second material layer is greater than the hardness of the first material layer, the fixing part can adjust the material of the first material layer to be the same or similar to the material of the wall portion, so that the fixing part is connected to the wall portion through the part of the first material layer located in the base portion, which is beneficial to reducing the difficulty of connection between the fixing part and the wall portion, and at least part of the second material layer is set to be located in the limiting portion, thereby reducing the difficulty of connection between the fixing part and the wall portion while further improving the structural strength of the limiting portion, which is beneficial to reducing the risk of breakage or deformation of the limiting portion, so as to improve the assembly effect of the fixing part on the electrode terminal, and in the case of limiting portions of the same strength, the thickness of the limiting portion can be further reduced, which is beneficial to further optimize the size of the fixing part in the thickness direction of the wall portion.

[0084] In some embodiments, a portion of the first material layer is located within the limiting portion, and along a thickness direction of the wall portion, at least a portion of the first material layer and the second material layer located within the limiting portion overlap.

[0085] In the above technical solution, by arranging the first material layer and the second material layer in the limiting portion, and the first material layer and the second material layer located in the limiting portion at least partially overlap with each other in the thickness direction of the wall portion, on the one hand, the contact area between the first material layer and the second material layer in the limiting portion can be increased to reduce the difficulty of connecting the first material layer and the second material layer in the limiting portion, and on the other hand, the first material layer and the second material layer in the limiting portion can be mutually constrained and reinforced, which is conducive to further improving the structural strength of the limiting portion.

[0086] In some embodiments, a portion of the second material layer is located within the base portion, and along a thickness direction of the wall portion, at least a portion of the first material layer and the second material layer located within the base portion overlap.

[0087] In the above technical solution, by arranging part of the first material layer and part of the second material layer in the base, and at least part of the first material layer and the second material layer located in the base overlap, on the one hand, it is convenient for the first material layer in the base to be connected to the wall, and on the other hand, it can improve the structural strength of the base, which is beneficial to reduce the risk of breakage or deformation of the base, so as to improve the overall structural strength of the fixing part.

[0088] In some embodiments, the base and the limiting portion are spaced apart along the thickness direction of the wall portion, and the fixing member further includes a connecting portion, which connects the base and the limiting portion; wherein, a portion of the first material layer is located in the connecting portion, and a portion of the second material layer is located in the connecting portion, and along the thickness direction of the wall portion, the first material layer and the second material layer located in the connecting portion at least partially overlap.

[0089] In the above technical solution, the fixing member is further provided with a connecting portion, which connects the limiting portion and the base portion through the connecting portion, so as to facilitate the connection of the limiting portion and the wall portion to cooperate in clamping the electrode terminal, and can reduce the difficulty of assembly between the fixing member and the wall portion. Specifically, by arranging part of the first material layer and part of the second material layer in the connecting portion, and at least part of the first material layer and the second material layer located in the connecting portion overlap, the structural strength of the connecting portion can be improved, which is beneficial to reducing the risk of breakage or deformation of the connecting portion, so as to improve the overall structural strength of the fixing member.

[0090] In some embodiments, in a same plane perpendicular to a thickness direction of the wall portion, an orthographic projection of the first material layer and an orthographic projection of the second material layer at least partially overlap.

[0091] In the above technical solution, by setting the first material layer and the second material layer to a structure in which the projections in the thickness direction of the wall portion at least partially overlap, on the one hand, the difficulty of connecting the first material layer and the second material layer can be reduced, thereby reducing the difficulty of forming the fixing part; on the other hand, the first material layer and the second material layer can be mutually constrained and reinforced, which is beneficial to improving the overall structural strength of the fixing part.

[0092] In some embodiments, in the same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the first material layer and the orthographic projection of the second material layer completely overlap.

[0093] In the above technical solution, by setting the first material layer and the second material layer to a completely overlapping structure in the projection in the thickness direction of the wall portion, on the one hand, the contact area between the first material layer and the second material layer can be further increased to further reduce the difficulty of connecting the first material layer and the second material layer, thereby further reducing the difficulty of forming the fixing part; on the other hand, the mutual constraint between the first material layer and the second material layer can be further strengthened, which is conducive to further improving the overall structural strength of the fixing part.

[0094] In some embodiments, along the thickness direction of the wall portion, the second material layer is located on a side of the first material layer facing the wall portion.

[0095] In the above technical solution, by setting the second material layer to be located on the side of the first material layer facing the wall, it is beneficial to improve the structural strength of the side of the limiting portion facing the wall, thereby facilitating the assembly of the electrode terminal by the fixing part, and is beneficial to improving the structural stability of the electrode terminal assembled on the wall.

[0096] In some embodiments, along the thickness direction of the wall portion, the second material layer is located on the side of the first material layer facing away from the wall portion; wherein, the first material layer located in the base is connected to the wall portion to form a connection area, and in the same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the connection area and the orthographic projection of the second material layer do not overlap.

[0097] In the above technical solution, by setting the second material layer to be located on the side of the first material layer away from the wall portion, and setting the connection area formed by the mutual connection of the first material layer and the wall portion in the base portion so that the projection in the thickness direction of the wall portion does not overlap with the projection of the second material layer, the battery cell adopting this structure can, on the one hand, increase the contact area between the first material layer in the base portion and the wall portion, which is beneficial to improving the connection stability and reliability between the base portion and the wall portion of the fixing part; on the other hand, it can reduce the coverage and interference effect of the second material layer on the connection position between the first material layer in the base portion and the wall portion, which is beneficial to reducing the difficulty of connection between the first material layer in the base portion and the wall portion.

[0098] In some embodiments, the first material layer and the second material layer are stacked, and along a stacking direction of the first material layer and the second material layer, a thickness of the first material layer is greater than a thickness of the second material layer.

[0099] In the above technical solution, by setting the thickness of the first material layer to be greater than the thickness of the second material layer, the thickness of the area of ​​the base used for interconnection with the wall portion is increased, thereby facilitating the connection stability and reliability between the fixing member and the wall portion.

[0100] In some embodiments, the melting point of the first material layer is greater than or equal to 500°C and less than or equal to 1000°C; the melting point of the second material layer is greater than or equal to 1050°C and less than or equal to 3500°C; the melting point of the wall portion is greater than or equal to 500°C and less than or equal to 1000°C.

[0101] In the above technical solution, the melting point of the first material layer is set to be close to or the same as the melting point of the wall, so as to facilitate the assembly connection of the first material layer and the wall. The second material layer has a higher melting point, has better high temperature resistance, and is not easily deformed by heat.

[0102] In some embodiments, the hardness of the first material layer is greater than or equal to 30 kgf / mm 2 , and less than or equal to 170kgf / mm 2 ; The hardness of the second material layer is greater than or equal to 100kgf / mm 2 , and less than or equal to 500kgf / mm 2 .

[0103] In the above technical solution, by setting the hardness of the first material layer to 30kgf / mm 2 Up to 170kgf / mm 2 , so that the first material layer has better anti-deformation ability, and the hardness of the second material layer is set to 100kgf / mm 2 Up to 500kgf / mm 2 , so that the second material layer has better anti-deformation ability than the first material layer, and the overall anti-deformation ability of the structure formed by the second material layer and the first material layer is better, so as to limit the movement of the electrode terminal relative to the wall away from the electrode assembly.

[0104] In some embodiments, the first material layer located in the base is connected to the wall portion by welding.

[0105] In the above technical solution, a welding connection structure is used to connect the wall and the first material layer in the base to improve the connection strength between the wall and the base and reduce the difficulty of connecting the wall and the first material layer in the base.

[0106] In some embodiments, the material of the first material layer is the same as the material of the wall portion.

[0107] In the above technical solution, by setting the material of the first material layer of the fixing part to the same structure as the material of the wall part, a structure in which the base and the wall part are welded with the same material is achieved, which is beneficial to reducing the difficulty of welding between the first material layer in the base and the wall part, and can reduce the occurrence of welding defects between the base and the wall part, which is beneficial to improving the welding quality between the wall part and the base of the fixing part.

[0108] In some embodiments, the first material layer and the second material layer are compositely connected.

[0109] In the above technical solution, by setting the first material layer and the second material layer of the fixing part as a composite connection structure, on the one hand, the connection stability and reliability between the first material layer and the second material layer of the fixing part can be improved, and on the other hand, the molding difficulty of the fixing part can be reduced, which is conducive to improving the production efficiency of the fixing part.

[0110] In some embodiments, the base metal of the first material layer and the base metal of the second material layer are the same.

[0111] In the above technical solution, by setting the base metal of the first material layer and the base metal of the second material layer to the same structure, so that the first material layer and the second material layer have the same main components, the connection difficulty between the first material layer and the second material layer can be reduced, thereby reducing the difficulty of forming the fixing part.

[0112] In some embodiments, the material of the first material layer is aluminum or an aluminum alloy, and the material of the second material layer is steel, stainless steel, copper, a copper alloy, titanium or a titanium alloy.

[0113] In some embodiments, the first material layer is made of steel or stainless steel, and the second material layer is made of titanium or titanium alloy.

[0114] In some embodiments, the second material layer is made of ceramic, polymer plastic or carbon fiber reinforced composite material.

[0115] In some embodiments, the housing includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the electrode assembly is received in the receiving cavity; the end cover closes the opening; wherein the end cover is the wall portion.

[0116] In the above technical solution, by setting the wall portion of the shell as the end cover for closing the opening of the shell, the battery cell adopting this structure is convenient for assembling the electrode terminal to the wall portion through the fixing part, which is beneficial to reducing 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 reducing the difficulty of assembling between the electrode terminal and the electrode assembly, thereby effectively reducing the difficulty of assembling the battery cell and improving the production efficiency of the battery cell.

[0117] In some embodiments, the outer 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, 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, the side wall and the wall portion jointly define a accommodating cavity, and the electrode assembly is accommodated in the accommodating cavity; the end cover closes the opening.

[0118] 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.

[0119] In a second aspect, an embodiment of the present application further provides a battery device comprising the above-mentioned battery cell.

[0120] 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

[0121] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0122] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0123] Figure 2 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0124] Figure 3 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0125] Figure 4 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0126] Figure 5 A partial cross-sectional view of a battery cell perpendicular to its length direction provided in some embodiments of the present application;

[0127] Figure 6 for Figure 5 A partial enlarged view of the battery cell at point A shown;

[0128] Figure 7 A cross-sectional view of a fixing member provided in some embodiments of the present application;

[0129] Figure 8 for Figure 7 A partial enlarged view of position B of the fixing member shown;

[0130] Figure 9 Cross-sectional views of fixing members provided in some other embodiments of the present application;

[0131] Figure 10 for Figure 9 A partial enlarged view of position C of the fixing member shown;

[0132] Figure 11 A cross-sectional view of a fixing member provided in some further embodiments of the present application;

[0133] Figure 12 Cross-sectional views of fixing members provided in other embodiments of the present application;

[0134] Figure 13 Schematic diagram of the assembly of the fixing member and the electrode terminal provided in some embodiments of the present application;

[0135] Figure 14 A schematic diagram of the structure of electrode terminals provided in some embodiments of the present application;

[0136] Figure 15 A front view of an electrode terminal provided in some embodiments of the present application in a thickness direction of a wall portion;

[0137] Figure 16 A cross-sectional view of an electrode terminal provided in some embodiments of the present application;

[0138] Figure 17 A partial cross-sectional view of a battery cell perpendicular to its thickness direction provided in some embodiments of the present application;

[0139] Figure 18 for Figure 17 A partial enlarged view of a battery cell at position D is shown;

[0140] Figure 19 A schematic structural diagram of a first insulating member provided in some embodiments of the present application;

[0141] Figure 20 A schematic structural diagram of a fixing member provided in some embodiments of the present application;

[0142] Figure 21 A front view of a fixing member provided in some embodiments of the present application in the thickness direction of a wall portion;

[0143] Figure 22 Partial cross-sectional views of battery cells perpendicular to their length direction provided in some other embodiments of the present application;

[0144] Figure 23 for Figure 22 A partial enlarged view of the battery cell at position E shown;

[0145] Figure 24 Cross-sectional views of fixing members provided in some further embodiments of the present application.

[0146] Icons: 1000-vehicle; 100-battery device; 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-base; 232-limiting portion; 2321-second limiting groove; 2322-lead-out hole; 233-connecting portion; 2331-bend section; 2332- Straight section; 234-thinning groove; 235-first material layer; 236-second material layer; 24-electrode terminal; 241-main body; 2411-first limiting protrusion; 242-assembly portion; 25-first insulating member; 251-first limiting groove; 252-second limiting protrusion; 26-current collecting component; 261-protruding portion; 27-second insulating member; 271-first extension portion; 28-third insulating member; 281-second extension portion; 29-pressure relief mechanism; 200-controller; 300-motor; X-thickness direction of the wall. DETAILED DESCRIPTION

[0147] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0148] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0149] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0150] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0151] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0152] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0153] The term "plurality" used in this application refers to two or more (including two).

[0154] 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.

[0155] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0156] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0157] In some embodiments, the positive electrode may be a positive electrode sheet, which 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.

[0158] 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 provided on either or both of the two facing surfaces of the positive electrode current collector.

[0159] 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 layer 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.).

[0160] 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 battery positive electrode active materials may also be used. These positive electrode active materials may 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 at least one of its modified compounds, etc.

[0161] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or the like. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0162] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0163] As an example, the negative electrode current collector may be a metal foil, a metal foam, 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 metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, etc. The composite current collector may include a polymer material base layer 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.).

[0164] 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.

[0165] 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 provided on either or both of the two facing surfaces of the negative electrode current collector.

[0166] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well 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.

[0167] 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.

[0168] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0169] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known separator membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0170] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0171] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0172] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0173] 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 bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0174] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl 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.

[0175] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0176] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0177] 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, or the like.

[0178] 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.

[0179] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0180] 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.

[0181] In some embodiments, the electrode assembly is a laminated structure.

[0182] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0183] 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.

[0184] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0185] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0186] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0187] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0188] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0189] In some embodiments, a 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 (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0190] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include but are not limited to square-shell, blade-shaped, and polygonal batteries, such as hexagonal batteries.

[0191] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0192] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is a battery module formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0193] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0194] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0195] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0196] As an example, the housing may include a first housing body and a second housing body. The first and second housing bodies engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first housing body may be a top cover or a bottom plate.

[0197] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0198] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0199] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0200] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are a crucial component of today's new energy development. The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, battery safety must be considered.

[0201] For a general battery cell, the outer shell of the battery cell usually includes a shell and an end cover, and the end cover covers the opening of the shell, wherein a terminal hole is provided on the end cover. In order to facilitate the assembly of the battery cell, the electrode terminal is usually inserted into the terminal hole of the end cover, and a pressure ring is connected to the end cover. The pressure ring is arranged around the electrode terminal. By arranging a part of the electrode terminal to be located between the pressure ring and the end cover, the end cover and the pressure ring can cooperate to press the electrode terminal onto the end cover, so that the electrode terminal is assembled on the end cover. At the same time, in order to reduce the risk of short circuit between the electrode terminal and the end cover, a pressure ring is usually placed between the pressure ring and the electrode terminal. An insulating ring is provided to achieve insulation isolation between the electrode terminal and the pressure ring through the insulating ring. However, in order to improve the connection reliability between the pressure ring and the end cover and to save the space occupied by the pressure ring and the electrode terminal in the thickness direction of the end cover, the battery cell in the related art makes the space between the pressure ring and the electrode terminal for assembling the insulating ring smaller, resulting in insufficient creepage distance between the pressure ring and the electrode terminal, which makes it easy for the electrode terminal and the pressure ring to short-circuit with each other during use of the battery cell, causing the risk of short circuit during use of the battery cell, which is not conducive to improving the reliability of the battery cell.

[0202] Based on the above considerations, in order to solve the problem of low reliability of battery cells, an embodiment of the present application provides a battery cell, which includes a shell, an electrode assembly, an electrode terminal, a fixing member and a first insulating member. The shell has a wall portion. The electrode assembly is accommodated in the shell. The electrode terminal is arranged on the wall portion, and the electrode terminal is electrically connected to the electrode assembly. The fixing member is arranged on the peripheral side of the electrode terminal, and the fixing member includes a base and a limiting portion, the base is connected to the wall portion, the limiting portion is connected to the base and extends in a direction close to the electrode terminal, and the limiting portion is configured to limit the movement of the electrode terminal in a direction away from the electrode assembly along the thickness direction of the wall portion. At least a portion of the first insulating member is arranged between the electrode terminal and the limiting portion. The thickness of the limiting portion is less than the thickness of the base.

[0203] In a battery cell of this structure, a fixing part is connected to the wall of the shell, and the fixing part is provided with a base and a limiting part. The base is connected to the wall, and the limiting part is connected to the base and extends in a direction close to the electrode terminal. At least a part of the first insulating part is arranged between the limiting part and the electrode terminal, so that the limiting part and the wall can cooperate to clamp and assemble the electrode terminal to limit the movement of the electrode terminal in the direction away from the electrode assembly along the thickness direction of the wall, thereby achieving the assembly and fixation of the electrode terminal on the wall, and the insulation isolation between the limiting part and the electrode terminal can also be achieved by the first insulating part, wherein the fixing part is used to limit the assembly The thickness of the limiting portion of the electrode terminal is set to be smaller than the thickness of the base of the fixing member used to connect to the wall portion, so that while meeting the connection quality and connection strength requirements of the base of the fixing member and the wall portion, the space between the limiting portion and the electrode terminal for accommodating the first insulating member can be expanded, thereby increasing the thickness of the portion of the first insulating member arranged between the limiting portion and the electrode terminal to increase the creepage distance between the limiting portion and the electrode terminal, and further effectively alleviate the short circuit phenomenon between the limiting portion and the electrode terminal during use, which is beneficial to reducing the short circuit risk of the battery cell during use, so as to improve the reliability of the battery cell.

[0204] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and battery devices disclosed in this application can be used to alleviate the problem of short circuits in the battery cells during use, thereby improving the reliability of the battery cells.

[0205] The embodiments of the present application provide an electrical device that uses a battery cell or battery device as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. 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. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0206] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0207] Please refer to Figure 1 , Figure 1A schematic structural diagram 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. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 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 device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0208] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0209] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of the present application. Figure 3 The battery device 100 includes a housing 10 and a battery cell 20 , wherein the battery cell 20 is accommodated in the housing 10 .

[0210] The housing 10 is used to provide assembly space for the battery cells 20 and can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 cover each other, and the first housing body 11 and the second housing body 12 jointly define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure. The first housing body 11 covers the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define the assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, and the open side of the first housing body 11 covers the open side of the second housing body 12.

[0211] 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 cuboid.

[0212] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire assembly formed by the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single assembly, which is then housed within the housing 10.

[0213] In some embodiments, the battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component, which is used to connect the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20 .

[0214] 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 the shape of a cuboid, a cylinder, a prism, or other shapes. For example, Figure 3 In the figure, the battery cell 20 is a rectangular parallelepiped structure.

[0215] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , Figure 4 This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 5 A partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application, perpendicular to its length direction, Figure 6 for Figure 5 The partial enlarged view of the battery cell 20 at A is shown. Figure 7 A cross-sectional view of a fixing member 23 provided in some embodiments of the present application, Figure 8 for Figure 7A partial enlarged view of a portion B of the fixing member 23 is shown. The present application provides a battery cell 20, comprising a housing 21, an electrode assembly 22, a fixing member 23, an electrode terminal 24, and a first insulating member 25. The housing 21 has a wall portion 211. The electrode assembly 22 is housed within the housing 21. The electrode terminal 24 is disposed on the wall portion 211 and is electrically connected to the electrode assembly 22. The fixing member 23 is disposed around the electrode terminal 24 and includes a base 231 and a stopper 232. The base 231 is connected to the wall portion 211. The stopper 232 is connected to the base 231 and extends in a direction approaching the electrode terminal 24. The stopper 232 is configured to limit movement of the electrode terminal 24 in a direction away from the electrode assembly 22 along a thickness direction X of the wall portion. At least a portion of the first insulating member 25 is disposed between the electrode terminal 24 and the stopper 232. The thickness of the stopper 232 is less than that of the base 231.

[0216] The housing 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms. The housing 21 can also be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0217] In some embodiments, the housing 21 may include a shell 212 and an end cover 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 cover 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.

[0218] Optionally, the wall portion 211 for connecting the fixing member 23 and the assembly electrode terminal 24 may be the 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, such 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 the end cap 213 in the thickness direction X of the wall portion, or a side wall adjacent to and abutting the end cap 213.

[0219] When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 212 , 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 .

[0220] 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 shell 212 is a rectangular parallelepiped structure, and correspondingly, the end cover 213 is a rectangular plate-shaped structure.

[0221] It is understandable that the outer shell 21 is not limited to the above structure. The outer shell 21 can also be other structures. For example, the outer shell 21 includes a shell body 212 and two end covers 213. The shell body 212 is a hollow structure with openings 2121 on opposite sides. One end cover 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.

[0222] 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 various. For example, the electrode assembly 22 can be a wound structure formed by winding the positive electrode sheet, the separator and the negative electrode sheet, or it can be a stacked structure formed by stacking the positive electrode sheet, the separator and the negative electrode sheet.

[0223] Illustratively, the separator is an isolation membrane, and a main material of the isolation membrane may be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0224] The electrode assembly 22 has a tab 221 formed at one end near the wall 211 in the thickness direction X of the wall. The tab 221 is used to input or output the positive or negative electrode of the electrode assembly 22. The tab 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 tab 221 of the electrode assembly 22 is formed by the stacked connection of the regions of the positive electrode sheet not coated with the positive electrode active material layer, or the stacked connection of the regions of the negative electrode sheet not coated with the negative electrode active material layer. If the tab 221 is used to output the positive electrode of the electrode assembly 22, the tab 221 is formed by the stacked connection of the regions of the positive electrode sheet not coated with the positive electrode active material layer; if the tab 221 is used to output the negative electrode of the electrode assembly 22, the tab 221 is formed by the stacked connection of the regions of the negative electrode sheet not coated with the negative electrode active material layer.

[0225] Optionally, the number of electrode assemblies 22 contained in the housing 21 may be one or more. Figure 4In 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.

[0226] The electrode terminal 24 serves to output or input electrical 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 electrical energy of the battery cell 20 .

[0227] For example, the electrode terminal 24 can be made of a variety of materials, for example, copper, iron, aluminum, steel, aluminum alloy, etc. Of course, in some embodiments, the electrode terminal 24 can also be made of a composite material, that is, the electrode terminal 24 is formed by connecting two metals of different materials together, for example, by hot pressing or cold pressing.

[0228] Among them, a terminal hole 2111 is provided 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 to realize the input or output of electrical energy of the battery cell 20.

[0229] Optionally, the electrode terminal 24 may be directly connected to the tab 221 of the electrode assembly 22, such as by welding or abutting, or may be indirectly connected to the tab 221 of the electrode assembly 22 via other components. Similarly, the connection structure between the electrode terminal 24 and the busbar component may also be various, such as welding, abutting, or clamping.

[0230] 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 . 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 .

[0231] 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. 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.

[0232] Illustratively, 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.

[0233] In the embodiment of the present application, the fixing member 23 plays the role of fixing the electrode terminal 24 on the wall portion 211. 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 can 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 split structures, and the fixing member 23 is welded to the wall portion 211. Of course, in other embodiments, the fixing member 23 can also be screwed, clamped or bonded to the wall portion 211.

[0234] The fixing part 23 is arranged on the peripheral side of the electrode terminal 24, that is, the fixing part 23 is a structure arranged on the outer peripheral side of the electrode terminal 24. The fixing part 23 can be an annular structure arranged around the electrode terminal 24, or an intermittent structure arranged around the electrode terminal 24, or an arc structure extending along the circumference of the electrode terminal 24.

[0235] The base 231 of the fixing member 23 is a portion of the fixing member 23 for connecting with the wall portion 211, and the limiting portion 232 of the fixing portion is a portion of the fixing member 23 for limiting the movement of the electrode terminal 24 along the thickness direction X of the wall portion in a direction away from the electrode assembly 22. The limiting portion 232 of the fixing member 23 limits the movement of the electrode terminal 24 along the thickness direction X of the wall portion in a direction away from the electrode assembly 22. There may be various structures, for example, Figure 6 In the embodiment, part of the electrode terminal 24 is located between the limiting portion 232 and the wall portion 211 in the thickness direction X of the wall portion, so that the limiting portion 232 and the wall portion 211 are structures that cooperate to clamp the electrode terminal 24 to limit the movement of the electrode terminal 24 in the thickness direction X of the wall portion in the direction away from the electrode assembly 22, wherein part of the first insulating member 25 abuts between the limiting portion 232 and the electrode terminal 24 in the thickness direction X of the wall portion. Of course, in other embodiments, the limiting portion 232 and the electrode terminal 24 may also be structures in which the projections in the thickness direction X of the wall portion do not overlap, that is, the limiting portion 232 is a structure that indirectly presses the electrode terminal 24 onto the wall portion 211 through the first insulating member 25.

[0236] The limiting portion 232 is connected to the base 231 and extends in a direction close to the electrode terminal 24 . That is, the limiting portion 232 is connected to the inner circumference of the base 231 and extends in a direction perpendicular to the thickness direction X of the wall.

[0237] The thickness of the limiting portion 232 is smaller than the thickness of the base 231, that is, the wall thickness of the limiting portion 232 is smaller than the wall thickness of the base 231. Figure 6 、 Figure 7 and Figure 8 In the figure, the thickness direction of the limiting portion 232 and the thickness direction of the base 231 are both the thickness direction X of the wall. Correspondingly, the thickness of the limiting portion 232 is D1, and the thickness of the base 231 is D2, that is, D1 is smaller than D2.

[0238] Among them, a first insulating member 25 can also be arranged between the fixing member 23 and the electrode terminal 24. The first insulating member 25 is at least partially arranged between the electrode terminal 24 and the limiting portion 232, so that the first insulating member 25 can play the role of insulating and isolating the limiting portion 232 of the fixing member 23 and the electrode terminal 24, so as to achieve insulation isolation between the electrode terminal 24 and the limiting portion 232 of the fixing member 23.

[0239] For example, the first insulating member 25 can be made of various materials, such as rubber, silicone, or plastic.

[0240] In an embodiment of the present application, the limiting portion 232 is configured to cooperate with the wall portion 211 to limit the movement of the electrode terminal 24 along the thickness direction X of the wall portion, wherein the electrode terminal 24 includes a main body portion 241 and an assembly portion 242 protruding from the outer peripheral surface of the main body portion 241, and the assembly portion 242 extends between the limiting portion 232 and the wall portion 211, so that the portion of the assembly portion 242 in the thickness direction X of the wall portion is located between the limiting portion 232 and the wall portion 211, so that the limiting portion 232 and the wall portion 211 can cooperate with the assembly portion 242 of the electrode terminal 24 in the thickness direction X of the wall portion to clamp the electrode terminal 24, so as to fasten and limit the electrode terminal 24 on the wall portion 211.

[0241] It should be noted that the limiting portion 232 and the assembly portion 242 may be in direct or indirect contact. Similarly, the wall portion 211 and the assembly portion 242 may also be in direct or indirect contact. In other words, the limiting portion 232 and the wall portion 211 may be in a structure that directly clamps and limits the assembly portion 242, or they may be in a structure that indirectly clamps and limits the assembly portion 242 through other components. For example, see Figure 5 and Figure 6As shown, the battery cell 20 is provided with a first insulating member 25 and a second insulating member 27. Part of the first insulating member 25 is arranged between the limiting portion 232 of the fixing member 23 and the electrode terminal 24 to insulate and isolate the fixing member 23 and the electrode terminal 24. The second insulating member 27 is arranged between the wall portion 211 and the electrode terminal 24 to insulate and isolate the wall portion 211 and the electrode terminal 24, so that the limiting portion 232 of the fixing member 23 is a structure that contacts the assembly portion 242 through the first insulating member 25, and the wall portion 211 is a structure that contacts the assembly portion 242 through the second insulating member 27, so that the limiting portion 232 and the wall portion 211 are a structure that indirectly clamps and limits the assembly portion 242 through the first insulating member 25 and the second insulating member 27, so that the electrode terminal 24 can be insulated and installed on the wall portion 211, that is, no electrical connection is formed between the electrode terminal 24 and the wall portion 211.

[0242] 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.

[0243] For example, the second insulating member 27 may be made of rubber, silicone, plastic, or the like.

[0244] In some embodiments, the battery cell 20 may further include a third insulating member 28. Along the thickness direction X of the wall, the third insulating member 28 is arranged on the side of the wall 211 facing the electrode assembly 22. Part 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.

[0245] For example, the third insulating member 28 may be made of rubber, silicone, plastic, or the like.

[0246] Alternatively, see Figure 5 and Figure 6As 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 wall surface of the terminal hole 2111 to insulate and isolate the electrode terminal 24. 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.

[0247] exist Figure 3 and Figure 4 In the figure, the battery cell 20 includes two electrode terminals 24 and two current collecting components 26. The two electrode terminals 24 are arranged at intervals on the wall 211, and the two current collecting components 26 are arranged at intervals in the shell 21. 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. 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 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. Correspondingly, the two pole ears 221 are respectively the positive and negative electrodes of the electrode assembly 22.

[0248] Among them, the battery cell 20 includes two fixing parts 23, two first insulating parts 25 and two second insulating parts 27. The fixing parts 23, the first insulating parts 25 and the second insulating parts 27 are all arranged in a one-to-one correspondence with the electrode terminals 24. Each electrode terminal 24 is assembled on the wall 211 through a fixing part 23. A first insulating part 25 is arranged between each electrode terminal 24 and a fixing part 23, and a second insulating part 27 is arranged between each electrode terminal 24 and the wall 211.

[0249] Optionally, both electrode terminals 24 are insulated and mounted on the wall portion 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 may also be mounted on different walls of the housing 21 .

[0250] 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 configured to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0251] The pressure relief mechanism 29 may be provided on the end cover 213 of the housing 21 or on the shell 212 of the housing 21. Figure 4 In the embodiment, the pressure relief mechanism 29 is provided on the end cover 213 of the housing 21 .

[0252] Optionally, the pressure relief mechanism 29 and the housing 21 may be integrally formed or separately formed. If the pressure relief mechanism 29 and the housing 21 are separate structures, the pressure relief mechanism 29 may be connected to the housing 21 by welding or other methods. Accordingly, the pressure relief mechanism 29 may be a pressure relief component such as an explosion-proof valve, explosion-proof disk, air valve, pressure relief valve, or safety valve. If the pressure relief mechanism 29 and the housing 21 are integrally formed, the pressure relief mechanism 29 may be an area of ​​the housing 21 where a weak structure is formed, such as an area of ​​the housing 21 where a notch is provided.

[0253] In this embodiment, a fixing member 23 is connected to the wall portion 211 of the shell 21, and the fixing member 23 is provided with a base 231 and a limiting portion 232. The base 231 is connected to the wall portion 211, and the limiting portion 232 is connected to the base 231 and extends in a direction close to the electrode terminal 24. At least a portion of the first insulating member 25 is provided between the limiting portion 232 and the electrode terminal 24, so that the limiting portion 232 and the wall portion 211 can cooperate to clamp and assemble the electrode terminal 24 to limit the electrode terminal 24 from moving in a direction away from the electrode assembly 22 along the thickness direction X of the wall portion, thereby achieving the assembly and fixation of the electrode terminal 24 on the wall portion 211, and the insulation isolation between the limiting portion 232 and the electrode terminal 24 can also be achieved through the first insulating member 25, wherein, by using the fixing member 23 to The thickness of the limiting portion 232 that limits the assembly of the electrode terminal 24 is set to be smaller than the thickness of the base 231 of the fixing member 23 used to connect to the wall portion 211, so that while meeting the connection quality and connection strength requirements of the base 231 of the fixing member 23 and the wall portion 211, the space between the limiting portion 232 and the electrode terminal 24 for accommodating the first insulating member 25 can be expanded, thereby increasing the thickness of the portion of the first insulating member 25 arranged between the limiting portion 232 and the electrode terminal 24 to increase the creepage distance between the limiting portion 232 and the electrode terminal 24, and further effectively alleviate the short circuit phenomenon between the limiting portion 232 and the electrode terminal 24 during use, which is beneficial to reducing the short circuit risk of the battery cell 20 during use, so as to improve the reliability of the battery cell 20.

[0254] 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 portion of the electrode terminal 24 is located between the stop portion 232 and the wall portion 211. In other words, a portion of the electrode terminal 24 extends between the stop portion 232 of the fixing member 23 and the wall portion 211, so that the stop portion 232 and the wall portion 211 are respectively located on either side of the portion of the electrode terminal 24 in the thickness direction X of the wall portion. This causes the projection of the stop portion 232 of the fixing member 23 in the thickness direction X of the wall portion to partially overlap with the projection of the electrode terminal 24, and causes the projection of the wall portion 211 in the thickness direction X of the wall portion to partially overlap with the projection of the electrode terminal 24.

[0255] Exemplarily, the electrode terminal 24 includes a main body portion 241 and an assembly portion 242 protruding from the outer peripheral surface of the main body portion 241, and the assembly portion 242 extends between the limiting portion 232 of the fixing member 23 and the wall portion 211, so that the portion of the assembly portion 242 in the thickness direction X of the wall portion is located between the limiting portion 232 of the fixing member 23 and the wall portion 211, so as to realize that a portion of the electrode terminal 24 is located between the limiting portion 232 and the wall portion 211.

[0256] In this embodiment, by setting a portion of the electrode terminal 24 between the upper limit portion 232 and the wall portion 211 in the thickness direction X of the wall portion, the portion of the limit portion 232 and the portion of the wall portion 211 are respectively located on both sides of the portion of the electrode terminal 24 in the thickness direction X of the wall portion, thereby improving the effect of the limit portion 232 and the wall portion 211 in cooperating to clamp and assemble the electrode assembly 22, thereby improving the effect of the limit portion 232 in limiting the movement of the electrode terminal 24 along the thickness direction X of the wall portion in the direction away from the electrode assembly 22, and thereby improving the stability and reliability of the electrode terminal 24 assembled to the wall portion 211.

[0257] According to some embodiments of the present application, referring to Figure 6 、 Figure 7 and Figure 8 , and please refer to Figure 9 、 Figure 10 and Figure 11 , Figure 9 This is a cross-sectional view of a fixing member 23 provided in some embodiments of the present application. Figure 10 for Figure 9 The partial enlarged view of the fixing member 23 at C is shown. Figure 11 This is a cross-sectional view of a fixing member 23 provided in some further embodiments of the present application. Along the wall thickness direction X, the surface of the stopper 232 facing the wall 211 is further away from the wall 211 than the surface of the base 231 facing the wall 211. In other words, the side of the fixing member 23 facing the wall 211 in the wall thickness direction X is a stepped structure, forming a receiving groove for accommodating the first insulating member 25 on the side of the fixing member 23 facing the wall 211 in the wall thickness direction X.

[0258] It should be noted that, along the thickness direction X of the wall, the surface of the limiting portion 232 facing the wall 211 is farther away from the wall 211 than the surface of the base 231 facing the wall 211. There may be various structures, for example, see 8 and Figure 10 As shown, the limiting portion 232 and the base portion 231 may be spaced apart in the thickness direction X of the wall portion, and the limiting portion 232 is further away from the wall portion 211 than the base portion 231 in the thickness direction X of the wall portion, so that the surface of the limiting portion 232 facing the wall portion 211 is further away from the wall portion 211 than the surface of the base portion 231 facing the wall portion 211, see Figure 11 As shown, the structure may also be one in which a local area of ​​the side of the fixing member 23 facing the wall portion 211 is thinned, so that the thinned area of ​​the fixing member 23 is the limiting portion 232, and the non-thinned area of ​​the fixing member 23 is the base 231, so that the surface of the limiting portion 232 facing the wall portion 211 is farther away from the wall portion 211 than the surface of the base 231 facing the wall portion 211.

[0259] In this embodiment, by setting the surface of the limiting portion 232 facing the wall portion 211 to be farther away from the wall portion 211 than the surface of the base 231 facing the wall portion 211, the portion of the electrode terminal 24 located between the limiting portion 232 and the wall portion 211 can share part of the space with the fixing member 23 in the thickness direction X of the wall portion, thereby effectively saving the space jointly occupied by the fixing member 23 and the electrode terminal 24 in the thickness direction X of the wall portion while meeting the creepage distance between the electrode terminal 24 and the limiting portion 232 and the connection reliability between the base 231 and the wall portion 211, thereby saving the space occupied by the battery cell 20 in the thickness direction X of the wall portion, and thus facilitating the improvement of the energy density of the battery cell 20.

[0260] According to some embodiments of the present application, see Figure 7 and Figure 8 as well as Figure 9 and Figure 10 As shown, along the thickness direction X of the wall, the surface of the limiting portion 232 facing away from the wall 211 is farther away from the wall 211 than the surface of the base 231 facing away from the wall 211. The fixing member 23 further includes a connecting portion 233 connecting the base 231 and the limiting portion 232.

[0261] Among them, along the thickness direction X of the wall, the surface of the limiting portion 232 facing away from the wall portion 211 is farther away from the wall portion 211 than the surface of the base 231 facing away from the wall portion 211. That is, the limiting portion 232 protrudes from the side of the base 231 facing away from the wall portion 211 in the thickness direction X of the wall, so that there is a height difference between the limiting portion 232 and the base 231 in the thickness direction X of the wall, and the limiting portion 232 is farther away from the wall portion 211 than the base 231.

[0262] The connecting portion 233 of the fixing member 23 is a structure connecting the base portion 231 and the limiting portion 232 in the fixing member 23. The structure of the connecting portion 233 can be various, for example, Figure 7 and Figure 8 In the embodiment, the connecting portion 233 is a bending structure connected between the base 231 and the limiting portion 232, and the limiting portion 232 and the base 231 are respectively connected to the two ends of the connecting portion 233, at 9 and Figure 10 In the embodiment, the connecting portion 233 includes two sections, namely a curved section 2331 and a straight section 2332 connected to each other, the curved section 2331 is connected to the base 231, the straight section 2332 is connected to the limiting portion 232, and the straight section 2332 and the limiting portion 232 are parallel to each other. Correspondingly, Figure 7 and Figure 8 The fixing member 23 shown in FIG has a structure in which the connecting portion 233 only includes a bent section 2331 .

[0263] In this embodiment, the surface of the limiting portion 232 facing away from the wall portion 211 is farther away from the wall portion 211 in the thickness direction X of the wall portion than the surface of the base 231 facing away from the wall portion 211, so that the limiting portion 232 is a structure protruding from the side of the base 231 facing away from the wall portion 211. By providing a connecting portion 233 between the base 231 and the limiting portion 232, on the one hand, it is beneficial to reduce the difficulty of connecting between the base 231 and the limiting portion 232, and can improve the connection stability between the base 231 and the limiting portion 232. On the other hand, while achieving the limiting portion 232 pressing the electrode terminal 24 and meeting the connection quality between the base 231 and the wall portion 211, there is no need to increase the thickness of the base 231 in the thickness direction X of the wall portion, which is beneficial to reducing the manufacturing cost of the fixing member 23 and can reduce the weight of the fixing member 23.

[0264] In some embodiments, see Figure 7 and Figure 8 as well as Figure 9 and Figure 10 As shown, the limiting portion 232 and the base portion 231 are spaced apart along the thickness direction X of the wall portion.

[0265] In this embodiment, by setting the limiting portion 232 and the base 231 as a structure spaced apart from each other in the thickness direction X of the wall, it is helpful to reduce the difficulty of partially assembling the electrode terminal 24 between the limiting portion 232 and the wall 211, and can reduce the difficulty of forming the connecting portion 233 connecting the limiting portion 232 and the base 231.

[0266] According to some embodiments of this application, see Figure 7 and Figure 8 as well as Figure 9 and Figure 10 As shown, along a direction perpendicular to the thickness direction X of the wall, the base portion 231 extends from the connecting portion 233 in a direction away from the electrode terminal 24 , and the limiting portion 232 extends from the connecting portion 233 in a direction close to the electrode terminal 24 .

[0267] The base portion 231 extends from the connection portion 233 away from the electrode terminal 24. Specifically, the base portion 231 extends from one end connected to the connection portion 233 and radially away from the electrode terminal 24. The stopper portion 232 extends from the connection portion 233 toward the electrode terminal 24. Specifically, the stopper portion 232 extends from one end connected to the connection portion 233 and radially toward the electrode terminal 24. This allows the base portion 231 and the stopper portion 232 to be parallel to each other and extend in opposite directions in the radial direction of the electrode terminal 24. It should be noted that the radial direction of the electrode terminal 24 is the direction from the center of the electrode terminal 24 toward the outer edge of the electrode terminal 24, or vice versa, within a plane perpendicular to the thickness direction X of the wall.

[0268] In this embodiment, by setting the limiting portion 232 as a structure extending from one side of the connecting portion 233 in a direction close to the electrode terminal 24, and setting the base 231 as a structure extending from the other side of the connecting portion 233 in a direction away from the electrode terminal 24, the cross-section of the fixing member 23 is made into a "Z"-shaped structure, which can optimize the structure of the fixing member 23 on the one hand, and help reduce the difficulty of connecting the fixing member 23 to the wall portion 211. On the other hand, it can reduce the interference between the base 231 and the electrode terminal 24, and can reduce the phenomenon that the base 231 occupies the space between the wall portion 211 and the limiting portion 232, thereby facilitating the limiting portion 232 and the wall portion 211 to cooperate in clamping and assembling the electrode terminal 24, and is conducive to optimizing the space occupied by the fixing member 23 and the electrode terminal 24 in the thickness direction X of the wall.

[0269] In some embodiments, see Figure 6 As shown, in the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the connecting portion 233 and the orthographic projection of the electrode terminal 24 do not overlap. In other words, the connecting portion 233 and the electrode terminal 24 are arranged in a radial direction of the electrode terminal 24 with an interval, so that the connecting portion 233 and the electrode terminal 24 do not overlap each other in the thickness direction X of the wall portion.

[0270] In this embodiment, by setting the connecting portion 233 and the electrode terminal 24 to a structure in which the projections in the thickness direction X of the wall portion do not overlap, the interference effect between the connecting portion 233 and the electrode terminal 24 can be reduced, and the creepage distance between the connecting portion 233 and the electrode terminal 24 can be increased, which is beneficial to reducing the risk of short circuit between the connecting portion 233 and the electrode terminal 24.

[0271] According to some embodiments of the present application, see Figure 9 and Figure 10As shown, the connecting portion 233 may include a curved section 2331 and a straight section 2332. The curved section 2331 is connected to the base portion 231 and extends perpendicularly to the wall thickness direction X. The straight section 2332 is connected to the curved section 2331 and extends from the curved section 2331 toward the electrode terminal 24. The surface of the straight section 2332 facing away from the wall 211 is farther away from the wall 211 in the wall thickness direction X than the surface of the base portion 231 facing away from the wall 211. The stopper 232 is connected to the end of the straight section 2332 facing the electrode terminal 24 in the direction perpendicular to the wall thickness direction X.

[0272] The straight section 2332 is a structure in the connecting portion 233 that is connected to the end of the curved section 2331 away from the base 231 and extends radially toward the electrode terminal 24 , so that the straight section 2332 and the base 231 are parallel to each other.

[0273] The surface of the straight section 2332 facing away from the wall 211 is further away from the wall 211 in the thickness direction X of the wall than the surface of the base 231 facing away from the wall 211. That is, the straight section 2332 of the connecting portion 233 is a structure that protrudes from the side of the base 231 facing away from the wall 211 in the thickness direction X of the wall. For example, Figure 10 In the embodiment, the straight section 2332 and the base 231 are spaced apart in the thickness direction X of the wall, and the straight section 2332 is farther away from the wall 211 than the base 231 .

[0274] The limiting portion 232 is connected to the end of the straight section 2332 facing the electrode terminal 24 in a direction perpendicular to the thickness direction X of the wall portion, that is, the limiting portion 232 is connected to the end of the straight section 2332 facing the electrode terminal 24 in the radial direction of the electrode terminal 24. Exemplarily, the straight section 2332 is an annular structure arranged around the electrode terminal 24, and correspondingly, the limiting portion 232 is connected to the inner circumferential surface of the straight section 2332.

[0275] In this embodiment, the connecting portion 233 is provided with a curved section 2331 and a straight section 2332 connected to each other, the curved section 2331 is connected to the base 231, and the straight section 2332 extends from the curved section 2331 toward the electrode terminal 24 in a direction perpendicular to the thickness direction X of the wall portion, and the limiting portion 232 is connected to the end of the straight section 2332 facing the electrode terminal 24, so that the surface of the limiting portion 232 facing the wall 211 and the surface of the straight section 2332 facing the wall 211 can be compared with the surface of the base 231 facing the wall 211. Further away from the wall portion 211, the fixing part 23 adopting this structure is convenient for connecting the connecting part 233 with the limiting part 232, which is beneficial to reducing the connection difficulty between the connecting part 233 and the limiting part 232. On the other hand, it can improve the connection strength between the limiting part 232 and the connecting part 233, so that the force of the limiting part 232 pressing the electrode terminal 24 is the structure acting on the straight section 2332 of the connecting part 233, which is beneficial to improving the overall structural strength of the fixing part 23 and can improve the effect of the limiting part 232 of the fixing part 23 pressing the electrode terminal 24.

[0276] In some embodiments, see Figure 10 As shown, along the thickness direction X of the wall, the surface of the limiting portion 232 facing the wall 211 is farther away from the wall 211 than the surface of the straight section 2332 facing the wall 211, so as to form a thinning groove 234 on the side of the limiting portion 232 facing the wall 211, and a portion of the first insulating member 25 is accommodated in the thinning groove 234.

[0277] Among them, the thinning groove 234 is a structure jointly defined by the surface of the limiting portion 232 facing the wall portion 211 in the thickness direction X of the wall portion and the end surface of the straight section 2332 facing the electrode terminal 24 in the radial direction of the electrode terminal 24. Part of the first insulating member 25 is accommodated in the thinning groove 234, that is, the part of the first insulating member 25 located between the limiting portion 232 and the electrode terminal 24 in the thickness direction X of the wall portion is inserted in the thinning groove 234.

[0278] For example, in Figure 10 In the thickness direction X of the wall portion, the surface of the limiting portion 232 facing away from the wall portion 211 is flush with the surface of the straight section 2332 facing away from the wall portion 211 .

[0279] In this embodiment, by setting the surface of the limiting portion 232 facing the wall portion 211 to be farther away from the wall portion 211 in the thickness direction X of the wall portion than the surface of the straight section 2332 facing the wall portion 211, a thinning groove 234 can be formed on the side of the limiting portion 232 facing the wall portion 211, and part of the first insulating member 25 is accommodated in the thinning groove 234, so that in the thickness direction X of the wall portion, the space between the limiting portion 232 of the fixing member 23 for assembling the electrode terminal 24 and the electrode terminal 24 can be expanded, so that the first insulating member 25 can meet the creepage distance between the electrode terminal 24 and the limiting portion 232 while also achieving the straight section 2332 of the connecting portion 233 and the first insulating member 25 sharing part of the space in the thickness direction X of the wall portion, thereby reducing the fixing member 23 and the first insulating member. The overall size occupied by the first insulating member 25 and the electrode terminal 24 in the thickness direction X of the wall portion is reduced, so that the thickness of the portion of the first insulating member 25 located between the limiting portion 232 and the electrode terminal 24 along the thickness direction X of the wall portion remains unchanged, and when the insulation isolation between the limiting portion 232 and the electrode terminal 24 is met, the spacing between the limiting portion 232 and the wall portion 211 in the thickness direction X of the wall portion can be reduced to optimize the size of the fixing member 23 in the thickness direction X of the wall portion, and the size of the electrode terminal 24 in the thickness direction X of the wall portion can be optimized, thereby reducing the space occupied by the electrode terminal 24 and the fixing member 23 for assembling the electrode terminal 24 in the thickness direction X of the wall portion, thereby saving the space occupied by the battery cell 20 in the thickness direction X of the wall portion, which is beneficial to improving the energy density of the battery cell 20.

[0280] Of course, the structure of the fixing member 23 is not limited to this. In other embodiments, the fixing member 23 may also have other structures. For example, along the wall thickness direction X, the surface of the limiting portion 232 facing away from the wall portion 211 is closer to the wall portion 211 than the surface of the straight section 2332 facing away from the wall portion 211, and a portion of the first insulating member 25 is located on the side of the limiting portion 232 facing away from the wall portion 211. In other words, the thinning groove 234 is a structure defined by the surface of the limiting portion 232 facing away from the wall portion 211 in the wall thickness direction X and the end surface of the straight section 2332 facing the electrode terminal 24 in the radial direction of the electrode terminal 24. Portions of the first insulating member 25 are provided on both sides of the limiting portion 232 in the wall thickness direction X, so that at least a portion of the limiting portion 232 is embedded in the first insulating member 25.

[0281] In this embodiment, the surface of the limiting portion 232 away from the wall portion 211 is set to be closer to the wall portion 211 in the thickness direction X of the wall portion than the surface of the straight section 2332 away from the wall portion 211, so that the side of the limiting portion 232 away from the wall portion 211 can form a thinning groove 234, and part of the first insulating member 25 is located on the side of the limiting portion 232 away from the wall portion 211, so that on the one hand, the first insulating member 25 can be realized as a structure that covers at least part of the limiting portion 232, which is conducive to further improving the limiting portion 232 and the electrode. The insulation isolation effect between the terminals 24 is improved, and it is beneficial to improve the assembly stability between the first insulating member 25 and the fixing member 23. On the other hand, while improving the insulation isolation effect of the first insulating member 25 and the electrode terminal 24, it can also achieve that the straight section 2332 of the connecting portion 233 and the first insulating member 25 share part of the space in the thickness direction X of the wall, which is beneficial to optimize the space occupied by the fixing member 23 and the first insulating member 25 in the thickness direction X of the wall, thereby effectively improving the space utilization of the battery cell 20.

[0282] According to some embodiments of the present application, the fixing member 23 may also be other structures, see Figure 11 As shown, along the wall thickness direction X, the surface of the stopper 232 facing away from the wall 211 is flush with the surface of the base 231 facing away from the wall 211. In this embodiment, the fixing member 23 has a structure in which a local area on the side facing the wall 211 in the wall thickness direction X is thinned, so that the thinned area of ​​the fixing member 23 is the stopper 232, and the area of ​​the fixing member 23 that is not thinned is the base 231.

[0283] In this embodiment, the surface of the limiting portion 232 facing away from the wall portion 211 and the surface of the base 231 facing away from the wall portion 211 are arranged to be coplanar, so that the fixing member 23 is locally thinned on the side facing the wall portion 211 to form the structure of the limiting portion 232, and the area of ​​the fixing member 23 that is not thinned is the base 231, so that the thickness of the limiting portion 232 is smaller than the thickness of the base 231, the structure is simple, and easy to manufacture, which is conducive to reducing the processing difficulty of the fixing member 23.

[0284] According to some embodiments of the present application, the fixing member 23 may also be other structures, for example, please refer to Figure 12 , Figure 12The following are cross-sectional views of fixing members 23 provided in other embodiments of the present application. Along the wall thickness direction X, the surface of the stopper 232 facing away from the wall 211 is closer to the wall 211 than the surface of the base 231 facing away from the wall 211, and a portion of the first insulating member 25 is located on the side of the stopper 232 facing away from the wall 211. In other words, the side of the fixing member 23 facing away from the wall 211 in the wall thickness direction X is a stepped structure, forming a receiving groove for accommodating the first insulating member 25 on the side of the fixing member 23 facing away from the wall 211 in the wall thickness direction X.

[0285] In this embodiment, the surface of the limiting portion 232 facing away from the wall portion 211 is arranged to be closer to the wall portion 211 in the wall thickness direction X than the surface of the base portion 231 facing away from the wall portion 211, so that the side of the fixing member 23 facing away from the wall portion 211 is locally thinned, and part of the first insulating member 25 is located on the side of the limiting portion 232 facing away from the wall portion 211. Therefore, on the one hand, the first insulating member 25 can be configured to cover at least a portion of the limiting portion 232, which is beneficial for further improving the insulation isolation effect between the limiting portion 232 and the electrode terminal 24, and is beneficial for improving the assembly stability between the first insulating member 25 and the fixing member 23. On the other hand, while improving the insulation isolation effect of the first insulating member 25 between the limiting portion 232 and the electrode terminal 24, the base portion 231 of the fixing member 23 and the first insulating member 25 can share a portion of the space in the wall thickness direction X, which is beneficial for optimizing the space occupied by the fixing member 23 and the first insulating member 25 in the wall thickness direction X, thereby effectively improving the space utilization of the battery cell 20.

[0286] In some embodiments, see Figure 12 As shown, along the wall thickness direction X, the surface of the stopper 232 facing the wall 211 is flush with the surface of the base 231 facing the wall 211. In other words, the fixing member 23 has a structure in which a local area on the side facing away from the wall 211 in the wall thickness direction X is thinned, so that the thinned area of ​​the fixing member 23 is the stopper 232, and the area of ​​the fixing member 23 that is not thinned is the base 231.

[0287] In this embodiment, the surface of the limiting portion 232 facing the wall portion 211 and the surface of the base 231 facing the wall portion 211 are arranged to be coplanar, so that the fixing member 23 is locally thinned on the side away from the wall portion 211 to form the structure of the limiting portion 232, and the area of ​​the fixing member 23 that is not thinned is the base 231, so that the thickness of the limiting portion 232 is smaller than the thickness of the base 231, the structure is simple, and easy to manufacture, which is conducive to reducing the processing difficulty of the fixing member 23.

[0288] According to some embodiments of the present application, referring to Figure 6 , and please refer to Figure 13and Figure 14 , Figure 13 Schematic diagram of the assembly of the fixing member 23 and the electrode terminal 24 provided in some embodiments of the present application, Figure 14 Schematic diagram of the structure of the electrode terminal 24 provided in some embodiments of the present application. The electrode terminal 24 includes a main body 241 and an assembly portion 242. The main body 241 is electrically connected to the electrode assembly 22. The assembly portion 242 is protruding from the outer peripheral surface of the main body 241, and a portion of the assembly portion 242 is located between the limiting portion 232 and the wall portion 211 in the thickness direction X of the wall portion. In a direction perpendicular to the thickness direction X of the wall portion, the limiting portion 232 is located between the base 231 and the main body 241, and a portion of the first insulating member 25 is located between the limiting portion 232 and the outer peripheral surface of the main body 241.

[0289] 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 the 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.

[0290] The assembly portion 242 is protruding from the outer peripheral surface of the main body 241 , that is, the assembly portion 242 of the electrode terminal 24 is a structure connected to the outer peripheral surface of the main body 241 and extending along the radial direction of the electrode terminal 24 , so that the assembly portion 242 extends between the limiting portion 232 and the wall portion 211 .

[0291] 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 limiting portion 232 and the wall portion 211 to achieve the limiting portion 232 and the wall portion 211 to clamp and limit the part of the main body portion 241.

[0292] Along the direction perpendicular to the thickness direction X of the wall, the limiting portion 232 is located between the base portion 231 and the main body portion 241. That is, the limiting portion 232 is connected to one end of the base portion 231 close to the main body portion 241 in the radial direction of the electrode terminal 24. For example, Figure 6 In the embodiment, the limiting portion 232 is a structure indirectly connected to one end of the base portion 231 close to the main body portion 241 through the connecting portion 233 .

[0293] Along the direction perpendicular to the thickness direction X of the wall portion, a portion of the first insulating member 25 is located between the limiting portion 232 and the outer peripheral surface of the main body portion 241, that is, a portion of the first insulating member 25 is arranged between the limiting portion 232 and the main body portion 241 in the radial direction of the electrode terminal 24 to insulate and isolate the limiting portion 232 and the main body portion 241.

[0294] Exemplarily, the limiting portion 232 of the fixing member 23 is an annular structure, and the limiting portion 232 surrounds the outer side of the main body 241, so that the limiting portion 232 defines the lead-out hole 2322. The main body 241 of the electrode terminal 24 is arranged in the lead-out hole 2322 along the thickness direction X of the wall portion, and extends out of the side of the limiting portion 232 away from the wall portion 211. Correspondingly, a portion of the first insulating member 25 is accommodated between the inner circumferential surface of the limiting portion 232 and the outer circumferential surface of the main body 241.

[0295] In this embodiment, the electrode terminal 24 is provided with a main body portion 241 and an assembly portion 242. The assembly portion 242 of the electrode terminal 24 is a structure protruding from the outer peripheral surface of the main body portion 241, and the limiting portion 232 is located between the base 231 and the main body portion 241 in a direction perpendicular to the thickness direction X of the wall portion, so as to facilitate extending the assembly portion 242 to between the wall portion 211 and the limiting portion 232, so as to realize that part of the electrode terminal 24 is located between the wall portion 211 and the limiting portion 232. The structure is simple, and it is convenient for the wall portion 211 and the limiting portion 232 to cooperate with each other to limit the assembly portion 242.

[0296] According to some embodiments of the present application, referring to Figure 13 and Figure 14 , and please refer to Figure 15 and Figure 16 , Figure 15 This is a front view of the electrode terminal 24 provided in some embodiments of the present application in the thickness direction X of the wall portion. Figure 16 FIG2 is a cross-sectional view of an electrode terminal 24 according to some embodiments of the present application. The assembly portion 242 surrounds the outer side of the main body portion 241 .

[0297] 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 can 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.

[0298] 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 limiting portion 232 at any circumferential position of the main body portion 241, so that there is no need to position or rotate the electrode terminal 24 to adjust the angle during the assembly of the electrode terminal 24, which is conducive to reducing the difficulty of assembling the assembly portion 242 of the electrode terminal 24 between the wall portion 211 and the limiting portion 232, and is conducive to improving the stability and reliability of the electrode terminal 24 assembled on the wall portion 211.

[0299] According to some embodiments of the present application, referring to Figure 14 、 Figure 15 and Figure 16 , and please refer to Figure 17 、 Figure 8 and Figure 19 , Figure 17 A partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application, perpendicular to its thickness direction, Figure 18 for Figure 17 The partial enlarged view of the battery cell 20 at D is shown. Figure 19 Schematic diagram of the structure of the first insulating member 25 provided in some embodiments of the present application. One of the main body 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 251, and the first limiting protrusion 2411 is accommodated in the first limiting groove 251.

[0300] Among them, the first limiting groove 251 and the first limiting protrusion 2411 are configured to cooperate to limit the rotation of the electrode terminal 24 relative to the first insulating part 25, that is, after the first limiting protrusion 2411 is inserted into the first limiting groove 251, it can achieve circumferential locking between the electrode terminal 24 and the first insulating part 25, so as to limit the rotation of the electrode terminal 24 relative to the first insulating part 25 around the axis extending along the thickness direction X of the wall.

[0301] For example, in Figure 14 、 Figure 18 and Figure 19 In the embodiment, the first limiting protrusion 2411 is provided on the outer circumferential surface of the main body 241 of the electrode terminal 24, and correspondingly, the first limiting groove 251 is provided on the inner circumferential surface of the first insulating member 25. Of course, in other embodiments, the first limiting groove 251 may be provided on the outer circumferential surface of the main body 241, and correspondingly, the first limiting protrusion 2411 is provided on the inner circumferential surface of the first insulating member 25.

[0302] In this embodiment, a first limiting protrusion 2411 is provided on one of the main body 241 and the first insulating member 25, and a first limiting groove 251 is provided on the other, so that the first limiting groove 251 and the first limiting protrusion 2411 can cooperate to limit the rotation of the electrode terminal 24 relative to the first insulating member 25, so as to realize circumferential locking between the main body 241 and the first insulating member 25, which is conducive to alleviating the phenomenon that the electrode terminal 24 rotates relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall portion. On the one hand, it can improve the assembly accuracy between the electrode terminal 24 and the first insulating member 25 and reduce the assembly difficulty between the electrode terminal 24 and the first insulating member 25. On the other hand, it can improve the structural stability of the electrode terminal 24 assembled on the wall portion 211.

[0303] In some embodiments, see Figure 14 and Figure 15 as well as Figure 19As shown, there are multiple first limiting protrusions 2411, and the multiple first limiting protrusions 2411 are arranged at intervals along the circumference of the main body 241. The first limiting grooves 251 are correspondingly arranged to the first limiting protrusions 2411, and each first limiting groove 251 is used to accommodate a first limiting protrusion 2411.

[0304] Exemplarily, a plurality of first limiting protrusions 2411 are 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 251 are provided on the inner circumferential surface of the first insulating member 25, and the plurality of first limiting grooves 251 are arranged around the main body 241 so that each first limiting protrusion 2411 can be inserted into a first limiting groove 251.

[0305] Exemplarily, six first limiting protrusions 2411 are provided on the outer circumference of the main body 241, and correspondingly, six first limiting grooves 251 are provided on the inner circumference of the first insulating member 25. Of course, in other embodiments, the number of the first limiting protrusions 2411 and the first limiting grooves 251 can also be two, three, four, five or seven, etc.

[0306] 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 251. The battery cell 20 adopting this structure can further enhance the limiting effect of the circumferential locking between the electrode terminal 24 and the first insulating member 25, thereby helping to further alleviate 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.

[0307] In some embodiments, see Figure 14 、 Figure 16 、 Figure 18 and Figure 19 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 251 is provided on the first insulating member 25 .

[0308] The first limiting protrusion 2411 is protrudingly provided on the outer circumference of the main body 241 , and the first limiting groove 251 is provided on the inner circumference of the first insulating member 25 .

[0309] In this embodiment, the first limiting protrusion 2411 is a structure protruding from the outer peripheral surface of the main body 241, and the first limiting groove 251 is a structure arranged on the first insulating member 25. The battery cell 20 adopting this structure does not need to be grooved on the main body 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.

[0310] In some embodiments, see Figure 14 、 Figure 15 、 Figure 16 and Figure 18 As shown, the dimension of the first limiting protrusion 2411 protruding from the outer circumferential surface of the main body 241 is smaller than the dimension of the mounting portion 242 protruding from the outer circumferential surface of the main body 241. In other words, the length of the first limiting protrusion 2411 protruding in the radial direction of the electrode terminal 24 is smaller than the length of the mounting portion 242 protruding in the radial direction of the electrode terminal 24, so that the projection of the first limiting protrusion 2411 in the thickness direction X of the wall portion is located between the outer circumferential surface of the main body 241 and the outer circumferential surface of the mounting portion 242.

[0311] In this embodiment, by setting the size of the first limiting protrusion 2411 protruding from the outer circumferential surface of the main body 241 to be smaller than the size 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 base 231 of the fixing member 23, and can save the space occupied by the first limiting protrusion 2411 in the radial direction of the electrode terminal 24, so as to alleviate the phenomenon that the thickness of the part of the first insulating member 25 located between the first limiting protrusion 2411 and the fixing member 23 is too small, resulting in poor insulation effect.

[0312] According to some embodiments of the present application, see Figure 13 、 Figure 14 、 Figure 16 and Figure 18 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 facing the limiting portion 232. In other words, the first limiting protrusion 2411 is connected to the surface of the assembly portion 242 on the side facing 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 that is protruded from the side of the assembly portion 242 facing the limiting portion 232.

[0313] In this embodiment, by connecting the first limiting protrusion 2411 to the side of the assembly portion 242 facing the limiting portion 232 in the thickness direction X of the wall portion, on the one hand, the difficulty of setting the first limiting groove 251 on the first insulating member 25 can be reduced, and the difficulty of assembling the electrode terminal 24 and the first insulating member 25 can be reduced. On the other hand, the first limiting protrusion 2411 can utilize the space between the assembly portion 242 and the limiting portion 232 in the thickness direction X of the wall portion, and there is no need to increase the distance between the limiting portion 232 and the wall portion 211 to avoid the first limiting protrusion 2411, which is beneficial to saving the space occupied by the fixing member 23 and the wall portion 211 in the thickness direction X of the wall portion, so as to optimize the size of the battery cell 20 in the thickness direction X of the wall portion.

[0314] According to some embodiments of the present application, see Figure 13 As shown, along the thickness direction X of the wall portion, the first limiting protrusion 2411 and the limiting portion 232 are spaced apart.

[0315] In this embodiment, the first limiting protrusion 2411 and the limiting portion 232 are arranged as a spaced-apart structure in the thickness direction X of the wall portion to reduce the interference between the first limiting protrusion 2411 and the limiting portion 232, and a first insulating member 25 can be arranged between the first limiting protrusion 2411 and the limiting portion 232 to reduce the risk of short circuit between the first limiting protrusion 2411 and the fixing member 23.

[0316] According to some embodiments of the present application, see Figure 14 、 Figure 15 、 Figure 18 and Figure 19 As shown, in the same plane perpendicular to the thickness direction X of the wall, the orthographic projection of the first limiting protrusion 2411 does not overlap with the orthographic projection of the limiting portion 232 .

[0317] Among them, the first limiting protrusion 2411 is arranged on the side of the assembly portion 242 of the electrode terminal 24 facing the limiting portion 232 in the thickness direction X of the wall portion. Correspondingly, in the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the first limiting protrusion 2411 and the orthographic projection of the limiting portion 232 do not overlap, that is, the projections of the first limiting protrusion 2411 and the limiting portion 232 in the thickness direction X of the wall portion do not overlap, that is, the first limiting protrusion 2411 and the limiting portion 232 do not cover each other in the thickness direction X of the wall portion.

[0318] For example, see Figure 15 and Figure 18 , and please further combine Figure 20 and Figure 21 As shown, Figure 20 This is a schematic diagram of the structure of the fixing member 23 provided in some embodiments of the present application. Figure 21 This is a front view of the fixing member 23 provided in some embodiments of the present application, along the wall thickness direction X. In embodiments where a second limiting groove 2321 is provided on the limiting portion 232, and the second limiting groove 2321 extends through the limiting portion 232 along the wall thickness direction X, the first limiting protrusion 2411 is provided in a one-to-one correspondence with the second limiting groove 2321, and the projection of the first limiting protrusion 2411 along the wall thickness direction X is located within the second limiting groove 2321, so that the orthographic projections of the first limiting protrusion 2411 and the limiting portion 232 in the same plane perpendicular to the wall thickness direction X do not overlap.

[0319] In this embodiment, by setting the first limiting protrusion 2411 and the limiting portion 232 to a structure in which the projections in the thickness direction X of the wall portion do not overlap, on the one hand, the interference effect between the first limiting protrusion 2411 and the fixing member 23 can be reduced, and on the other hand, the risk of short circuit between the first limiting protrusion 2411 and the fixing member 23 can be reduced.

[0320] According to some embodiments of the present application, see Figure 18 、 Figure 19 、 Figure 20 and Figure 21 As shown, the fixing member 23 is arranged around the electrode terminal 24, one of the limiting portion 232 and the first insulating member 25 is provided with a second limiting groove 2321, and the other is provided with a second limiting protrusion 252, and the second limiting protrusion 252 is accommodated in the second limiting groove 2321.

[0321] The fixing member 23 is disposed around the electrode terminal 24 , that is, the fixing member 23 is a ring-shaped structure and surrounds the outer side of the electrode terminal 24 .

[0322] The second limiting protrusion 252 and the second limiting groove 2321 are configured to cooperate to limit the rotation of the fixing member 23 relative to the first insulating member 25, that is, after the second limiting protrusion 252 is inserted into the second limiting groove 2321, 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 in the thickness direction X of the wall.

[0323] For example, the second limiting protrusion 252 is provided on the outer circumference of the first insulating member 25, and correspondingly, the second limiting groove 2321 is provided on the inner circumference of the limiting portion 232. Of course, in other embodiments, the second limiting groove 2321 may be provided on the outer circumference of the first insulating member 25, and correspondingly, the second limiting protrusion 252 is provided on the inner circumference of the limiting portion 232.

[0324] In this embodiment, the fixing member 23 is set to a structure arranged around the electrode terminal 24, and one of the first insulating member 25 and the limiting portion 232 is provided with a second limiting protrusion 252, and the other is provided with a second limiting groove 2321, so that the second limiting protrusion 252 and the second limiting groove 2321 can cooperate to limit the rotation of the fixing member 23 relative to the first insulating member 25, so as to achieve circumferential locking between the fixing member 23 and the first insulating member 25, which is conducive to 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 portion. On the one hand, it can improve the assembly accuracy between the fixing member 23 and the first insulating member 25 and 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.

[0325] In some embodiments, see Figure 19 、 Figure 20 and Figure 21 As shown, there are multiple second limiting grooves 2321, and the multiple second limiting grooves 2321 are arranged at intervals along the circumference of the fixing member 23, and the second limiting protrusions 252 are correspondingly arranged to the second limiting grooves 2321, and each second limiting groove 2321 is used to accommodate a second limiting protrusion 252.

[0326] Exemplarily, a plurality of second limiting protrusions 252 are provided on the outer peripheral surface of the first insulating member 25, and the plurality of second limiting protrusions 252 are arranged at intervals along the circumference of the first insulating member 25. Correspondingly, a plurality of second limiting grooves 2321 are provided on the limiting portion 232, and the plurality of second limiting grooves 2321 are arranged around the main body portion 241 so that each second limiting protrusion 252 can be inserted into a second limiting groove 2321.

[0327] Exemplarily, six second limiting grooves 2321 are provided on the limiting portion 232, and correspondingly, six second limiting protrusions 252 are convexly provided on the outer peripheral surface of the first insulating member 25. Of course, in other embodiments, the number of the second limiting grooves 2321 and the second limiting protrusions 252 can also be two, three, four, five or seven, etc.

[0328] In this embodiment, by providing a plurality of second limiting grooves 2321, and the plurality of second limiting grooves 2321 are arranged at intervals along the circumference of the fixing member 23, each second limiting groove 2321 is used for inserting a second limiting protrusion 252. The battery cell 20 adopting this structure can further enhance the limiting effect of the circumferential locking between the fixing member 23 and the first insulating member 25, thereby helping to further alleviate the phenomenon of the fixing member 23 rotating relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall.

[0329] In some embodiments, see Figure 18 、 Figure 19 、 Figure 20 and Figure 21 As shown, the limiting portion 232 is provided with a second limiting groove 2321 , and the first insulating member 25 is provided with a second limiting protrusion 252 .

[0330] The second limiting groove 2321 is provided on the inner circumferential surface of the limiting portion 232, and the second limiting protrusion 252 is provided on the outer circumferential surface of the first insulating member 25. It should be noted that in the embodiment where the limiting portion 232 of the fixing member 23 is an annular structure provided around the main body 241 and the limiting portion 232 defines the lead-out hole 2322, the second limiting groove 2321 is provided on the wall surface of the lead-out hole 2322.

[0331] In this embodiment, by setting the second limiting groove 2321 on the limiting portion 232 and correspondingly setting the second limiting protrusion 252 on the first insulating member 25, the battery cell 20 adopting this structure is convenient for processing the second limiting groove 2321 on the limiting portion 232, and is convenient for assembling the second limiting protrusion 252 of the first insulating member 25 in the second limiting groove 2321, which is beneficial to reducing the manufacturing difficulty of the battery cell 20. On the other hand, there is no need to protrude the second limiting protrusion 252 on the limiting portion 232, so that the second limiting protrusion 252 will not occupy the space of the limiting portion 232, which is beneficial to alleviating the interference between the second limiting protrusion 252 and the electrode terminal 24.

[0332] According to some embodiments of the present application, see Figure 7 、 Figure 18 、 Figure 20 and Figure 21 As shown, along the thickness direction X of the wall, the second limiting groove 2321 passes through both sides of the limiting portion 232. That is, both ends of the second limiting groove 2321 in the thickness direction X of the wall extend to the surfaces of both sides of the limiting portion 232 in the thickness direction X of the wall.

[0333] Among them, 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 2321, and the first limiting protrusion 2411 corresponds one-to-one to the second limiting groove 2321, so that the first limiting protrusion 2411 is a structure corresponding to the second limiting groove 2321, thereby further alleviating the interference phenomenon between the first limiting protrusion 2411 and the limiting portion 232, and increasing the thickness of the part of the first insulating member 25 located between the limiting portion 232 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 member 23.

[0334] It should be noted that, in other embodiments, the second limiting groove 2321 may also be a structure that is only arranged on the inner circumferential surface of the limiting portion 232 and does not penetrate through both sides of the limiting portion 232 in the thickness direction X of the wall portion. Of course, the second limiting groove 2321 may also be a structure that only penetrates one side of the limiting portion 232 in the thickness direction X of the wall portion.

[0335] In this embodiment, by setting the second limiting groove 2321 as a structure that passes through both sides of the limiting portion 232 in the thickness direction X of the wall portion, on the one hand, the difficulty of setting the second limiting groove 2321 on the limiting portion 232 can be reduced, and the second limiting protrusion 252 on the first insulating member 25 is facilitated to be assembled into the second limiting groove 2321. On the other hand, the space of the second limiting groove 2321 for accommodating the second limiting protrusion 252 can be further increased, which is beneficial to improving the limiting effect between the first insulating member 25 and the fixing member 23.

[0336] According to some embodiments of the present application, see Figure 6 、 Figure 7 and Figure 13 As shown, the limiting portion 232 is arranged around the electrode terminal 24 to form an extraction hole 2322. The electrode terminal 24 is inserted into the extraction hole 2322 along the thickness direction X of the wall portion and extends out of the side of the limiting portion 232 away from the wall portion 211.

[0337] Among them, the electrode terminal 24 includes a main body 241 and an assembly portion 242, the assembly portion 242 is protruded on the outer peripheral surface of the main body 241, and the main body 241 is close to the electrode assembly 22 at one end in the thickness direction X of the wall for electrical connection with the electrode assembly 22, and the main body 241 is passed through the lead-out hole 2322 along the thickness direction X of the wall, and extends the limiting portion 232 to the side away from the wall 211, so that the main body 241 is assembled and connected with the busbar component at one end away from the electrode assembly 22 in the thickness direction X of the wall.

[0338] In this embodiment, the electrode terminal 24 is arranged to be inserted into the lead-out hole 2322 along the thickness direction X of the wall portion and extend out of the limiting portion 232 on the side away from the wall portion 211, thereby facilitating the mutual assembly and connection of the electrode terminal 24 with other components, thereby reducing the difficulty of the electrode terminal 24 in outputting or inputting electrical energy into the battery cell 20. In addition, the thickness of the limiting portion 232 is smaller than the thickness of the base 231, so that while meeting the connection requirements between the base 231 and the wall portion 211, the size of the portion of the electrode terminal 24 inserted into the lead-out hole 2322 in the thickness direction X of the wall portion can be reduced, thereby saving the space occupied by the fixing member 23 and the wall portion 211 in the thickness direction X of the wall portion, thereby optimizing the size of the battery cell 20 in the thickness direction X of the wall portion.

[0339] 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 provided separately. In other words, the fixing member 23 and the wall portion 211 are separate structures, and the fixing member 23 is connected to the wall portion 211.

[0340] For example, in a structure where the fixing member 23 and the wall portion 211 are separately provided, the fixing member 23 may be connected to the wall portion 211 in various structures, such as welding, bonding, clamping or bolting.

[0341] In this embodiment, by setting the fixing member 23 and the wall portion 211 as a separate structure, it is helpful to reduce the difficulty of setting the fixing member 23 on the wall portion 211, and it is convenient to assemble the first insulating member 25 between the fixing member 23 and the electrode terminal 24, thereby helping to reduce the difficulty of assembling the battery cell 20.

[0342] In some embodiments, the base portion 231 is connected to the wall portion 211 by welding.

[0343] Exemplarily, the base portion 231 and the wall portion 211 are welded together by laser welding.

[0344] In this embodiment, the base 231 and the wall 211 are connected by welding, which can effectively improve the connection stability and reliability between the base 231 and the wall 211, and can reduce the difficulty of assembly between the fixing member 23 and the wall 211.

[0345] Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 may also have other structures. For example, Figure 22 and Figure 23 , Figure 22 A partial cross-sectional view of a battery cell 20 perpendicular to its length direction provided in some other embodiments of the present application, Figure 23 for Figure 22 The battery cell 20 is shown in a partially enlarged view at point E. The fixing member 23 is integrally formed with the wall portion 211 .

[0346] The fixing member 23 and the wall portion 211 are integrally formed, that is, the fixing member 23 and the wall portion 211 are an integrated structure, that is, the fixing member 23 and the wall portion 211 are a structure formed by an integrated molding process, such as stamping, casting or milling.

[0347] It should be noted that in the structure where the fixing member 23 and the wall portion 211 are integrally formed, see Figure 23 As shown, the fixing member 23 may only include a base 231 and a limiting portion 232, wherein the base 231 is a structure connected to the wall portion 211 and extending in a direction that is set at an acute angle to the thickness direction X of the wall portion. Correspondingly, the limiting portion 232 and the wall portion 211 are arranged at intervals in the thickness direction X of the wall portion, and the limiting portion 232 is parallel to the wall portion 211.

[0348] 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 improving the connection strength and connection stability between the fixing member 23 and the wall portion 211, thereby improving the stability of the limiting portion 232 of the fixing member 23 and the wall portion 211 in assembling the electrode terminal 24, and further facilitating the improvement of the reliability of the electrode terminal 24 being assembled on the wall portion 211.

[0349] According to some embodiments of the present application, see Figure 6 、 Figure 7 and Figure 8 As shown, the thickness of the limiting portion 232 is D1, and the thickness of the base 231 is D2, satisfying 0.3D2≤D1≤0.8D2.

[0350] Among them, the limiting portion 232 and the base 231 are structures extending in a direction perpendicular to the thickness direction X of the wall. Correspondingly, the thickness D1 of the limiting portion 232 is the dimension of the limiting portion 232 in the thickness direction X of the wall, and the thickness D2 of the base 231 is the dimension of the base 231 in the thickness direction X of the wall.

[0351] Exemplarily, the ratio of the thickness D1 of the limiting portion 232 to the thickness D2 of the base 231 can be 0.3, 0.31, 0.32, 0.33, 0.35, 0.37, 0.4, 0.42, 0.45, 0.48, 0.5, 0.52, 0.55, 0.58, 0.6, 0.62, 0.65, 0.68, 0.7, 0.71, 0.72, 0.75, 0.76, 0.78, 0.79 or 0.8, etc.

[0352] In this embodiment, by setting the ratio of the thickness of the limiting portion 232 to the thickness of the base 231 to 0.3 to 0.8, on the one hand, the thickness of the limiting portion 232 is set to be greater than or equal to 0.3 times the thickness of the base 231 to improve the structural strength of the limiting portion 232, which is conducive to reducing the phenomenon of breakage or deformation of the limiting portion 232 during use, thereby improving the stability and reliability of the fixing member 23 assembling the electrode terminal 24. On the other hand, the thickness of the limiting portion 232 is set to be less than or equal to the thickness of the base 231. 0.8 times, so that while meeting the requirements of connection quality and connection strength between the base 231 of the fixing part 23 and the wall part 211, the space between the limiting part 232 and the electrode terminal 24 for accommodating the first insulating part 25 can be further expanded, which is beneficial to further increase the thickness of the part of the first insulating part 25 arranged between the limiting part 232 and the electrode terminal 24, thereby increasing the creepage distance between the limiting part 232 and the electrode terminal 24, so as to further alleviate the short circuit phenomenon between the limiting part 232 and the electrode terminal 24 during use.

[0353] In some embodiments, see Figure 8 As shown, the thickness of the limiting portion 232 is D1, which satisfies 0.5 mm ≤ D1 ≤ 1.5 mm.

[0354] Exemplarily, the thickness D1 of the limiting portion 232 can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm or 1.5mm, etc.

[0355] In this embodiment, by setting the thickness of the limiting portion 232 to 0.5 mm to 1.5 mm, on the one hand, the structural strength of the limiting portion 232 can be improved to reduce the risk of breakage or deformation of the limiting portion 232 during use; on the other hand, the space occupied by the limiting portion 232 can be saved, which is beneficial to optimizing the overall dimensions of the fixing member 23, the first insulating member 25 and the electrode terminal 24 in the thickness direction X of the wall portion, so as to improve the space utilization of the battery cell 20.

[0356] According to some embodiments of the present application, see Figure 5 and Figure 6 as well as Figure 17 and Figure 18 As shown, at least a portion of the limiting portion 232 is embedded in the first insulating member 25 . Along the thickness direction X of the wall, a portion of the first insulating member 25 is located on a side of the limiting portion 232 away from the wall 211 .

[0357] In this embodiment, by embedding at least a portion of the limiting portion 232 of the fixing member 23 in the first insulating member 25, and a portion of the first insulating member 25 is located on the side of the limiting portion 232 away from the wall portion 211, the first insulating member 25 is a structure that covers at least a portion of the outer side of the limiting portion 232, thereby further improving the connection strength between the fixing member 23 and the first insulating member 25, thereby improving the assembly stability and reliability between the fixing member 23 and the first insulating member 25, and further reducing the risk of falling off between the first insulating member 25 and the fixing member 23, which is beneficial to improving the assembly quality of the battery cell 20.

[0358] 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 limiting portion 232 , and at least a portion of the base portion 231 is accommodated in the mounting groove 2112 .

[0359] The terminal hole 2111 is provided on the bottom surface of the assembly groove 2112 , and the terminal passes through the bottom wall of the assembly groove 2112 to connect the inside and outside of the housing 21 .

[0360] At least part of the base 231 is accommodated in the assembly groove 2112, that is, the base 231 can be partially accommodated in the assembly groove 2112, or the base 231 can be accommodated in the assembly groove 2112 as a whole. Figure 6 In the embodiment, the base 231 of the fixing member 23 is entirely accommodated in the assembly groove 2112 , that is, the base 231 does not exceed the notch of the assembly groove 2112 in the thickness direction X of the wall.

[0361] In this embodiment, an assembly groove 2112 for accommodating the base 231 is provided on the side of the wall portion 211 facing the limiting portion 232, so that at least a portion of the base 231 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, and can reduce the difficulty of assembly between the wall portion 211 and the base 231 of the fixing member 23.

[0362] In some embodiments, see Figure 6 As shown, the base portion 231 abuts against the bottom surface of the assembly groove 2112, and the base portion 231 abuts against the side surface of the assembly groove 2112. In other words, the surface of the base portion 231 facing the bottom surface of the assembly groove 2112 in the thickness direction X of the wall portion abuts against the bottom surface of the assembly groove 2112, and the surface of the base portion 231 at one end away from the electrode terminal 24 in the radial direction of the electrode terminal 24 abuts against the side surface of the assembly groove 2112.

[0363] 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 base 231 correspondingly abut against the groove side surface of the assembly groove 2112 .

[0364] In this embodiment, by setting the base 231 of the fixing member 23 to a structure that abuts against the bottom and side surfaces of the assembly groove 2112, the assembly groove 2112 can also limit and position the base 231 of the fixing member 23. 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 being assembled on the wall portion 211.

[0365] According to some embodiments of the present application, see Figure 6 、 Figure 7 、 Figure 20 and Figure 21As shown, the fixing member 23 is arranged around the electrode terminal 24.

[0366] Among them, the fixing member 23 is an annular structure surrounding the outer side of the main body 241 of the electrode terminal 24, and the limiting portion 232 is a structure connected to the inner circumference of the base 231 through the connecting portion 233. Correspondingly, the limiting portion 232 is connected to the inner circumference of the connecting portion 233.

[0367] In this embodiment, the fixing member 23 is provided as an annular structure arranged around the electrode terminal 24, so that the fixing member 23 can cooperate with the wall portion 211 at any position in its circumferential direction to assemble the electrode terminal 24, so that during the mutual assembly of the fixing member 23 and the electrode terminal 24, there is no need to position the fixing member 23 or rotate the fixing member 23 to adjust the angle, thereby reducing the difficulty of assembly between the fixing member 23 and the wall portion 211 and between the fixing member 23 and the electrode terminal 24, and improving the stability and reliability of the electrode terminal 24 assembled on the wall portion 211.

[0368] According to some embodiments of the present application, see Figure 5 and Figure 6 as well as Figure 17 and Figure 18 As shown, along the thickness direction X of the wall portion, the base portion 231 is connected to the side of the wall portion 211 facing away from the electrode assembly 22. In other words, the fixing member 23 is connected to the side of the wall portion 211 facing away from the electrode assembly 22, so that the limiting portion 232 of the fixing member 23 is located outside the housing 21 and cooperates with the wall portion 211 to assemble the electrode terminal 24, so that the limiting portion 232 can limit the movement of the electrode terminal 24 in the thickness direction X of the wall portion in a direction away from the electrode assembly 22.

[0369] The fixing member 23 is located on the side of the wall portion 211 facing away from the electrode assembly 22 in the thickness direction X of the wall portion, and the base 231 is connected to the side of the wall portion 211 facing away from the electrode assembly 22. In an embodiment in which the wall portion 211 is provided with a mounting groove 2112, the mounting groove 2112 is provided on the surface of the wall portion 211 facing away from the electrode assembly 22.

[0370] In this embodiment, by setting the base 231 of the fixing member 23 as a structure connected to the side of the wall portion 211 away from the electrode assembly 22, the fixing member 23 is a structure connected to the side of the wall portion 211 away from the electrode assembly 22, and the limiting portion 232 of the fixing member 23 is a structure for assembling the electrode terminal 24 to the wall portion 211 from the side of the wall portion 211 away from the electrode assembly 22. The battery cell 20 adopting this structure can, on the one hand, reduce the difficulty of connecting the fixing member 23 and the wall portion 211, and on the other hand, facilitate the assembly of the electrode terminal 24, which is beneficial to reducing the difficulty of assembling the electrode terminal 24 on the wall portion 211.

[0371] According to some embodiments of this application, see Figure 5 and Figure 6 as well as Figure 17 and Figure 18 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.

[0372] In which, the assembly portion 242 of the electrode terminal 24 is located on the side of the wall portion 211 away from the electrode assembly 22 in the thickness direction X of the wall portion, and a portion of the second insulating member 27 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.

[0373] For example, the second insulating member 27 may be made of rubber, plastic, or silicone.

[0374] In this embodiment, the battery cell 20 is further 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.

[0375] In some embodiments, see Figure 5 and Figure 6 as well as Figure 17 and Figure 18 As shown, the wall portion 211 is provided with a terminal hole 2111. The terminal hole 2111 penetrates the wall portion 211 along the thickness direction X of the wall portion. 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 provided around the terminal hole 2111 and is further configured to seal the gap between the wall portion 211 and the electrode terminal 24.

[0376] 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.

[0377] Alternatively, see Figure 5 and Figure 6As 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. Correspondingly, 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 wall surface of the terminal hole 2111 to insulate and isolate the electrode terminal 24 from the terminal hole 2111. 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.

[0378] In this embodiment, a terminal hole 2111 is further provided on the wall portion 211 for inserting the electrode terminal 24, so that the electrode terminal 24 can be electrically connected to the electrode assembly 22 contained in the outer shell 21. By setting the second insulating member 27 to 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, thereby helping to reduce the risk of leakage of the battery cell 20 at the terminal hole 2111.

[0379] According to some embodiments of this application, please refer to Figure 24 , Figure 24 This is a cross-sectional view of a fixing member 23 provided in yet other embodiments of the present application. The fixing member 23 includes a first material layer 235 and a second material layer 236 that are interconnected. The first material layer 235 is partially located within the base 231, and the portion of the first material layer 235 located within the base 231 is connected to the wall portion 211. At least a portion of the second material layer 236 is located within the retaining portion 232, and the second material layer 236 has a greater hardness than the first material layer 235.

[0380] The connection structure between the portion of the first material layer 235 located within the base 231 and the wall portion 211 can be various, such as welding or bonding. Similarly, the connection structure between the first material layer 235 and the second material layer 236 can also be various, such as bonding, welding, or a composite connection.

[0381] For example, in Figure 24In the embodiment, the first material layer 235 and the second material layer 236 are stacked along the thickness direction X of the wall portion. The first material layer 235 and the second material layer 236 are both annular structures surrounding the outside of the electrode terminal 24, and the second material layer 236 is located on the side of the first material layer 235 facing the wall portion 211. Of course, in other embodiments, the second material layer 236 can also be located on the side of the first material layer 235 away from the wall portion 211. Similarly, the second material layer 236 can also be a structure connected to the inner circumference of the first material layer 235.

[0382] At least part of the second material layer 236 is located in the limiting portion 232, that is, the second material layer 236 may be only partially located in the limiting portion 232, or may be entirely located in the limiting portion 232, that is, only the limiting portion 232 contains the second material layer 236. For example, Figure 24 In the figure, the first material layer 235 and the second material layer 236 are integrally stacked in the thickness direction X of the wall. Correspondingly, the base 231, the limiting portion 232 and the connecting portion 233 of the fixing member 23 all contain the first material layer 235 and the second material layer 236.

[0383] It should be noted that hardness is an inherent property of the material itself. Therefore, the hardness of the second material layer 236 is greater than the hardness of the first material layer 235 because the hardness of the material of the second material layer 236 is greater than the hardness of the material of the first material layer 235 .

[0384] In this embodiment, by configuring the fixing member 23 to have a composite structure including a first material layer 235 and a second material layer 236, wherein the hardness of the second material layer 236 is greater than that of the first material layer 235, the fixing member 23 can adjust the material of the first material layer 235 to be the same as or similar to the material of the wall portion 211, so that the fixing member 23 is connected to the wall portion 211 through the portion of the first material layer 235 located within the base 231, which helps to reduce the difficulty of connecting the fixing member 23 and the wall portion 211. In addition, at least a portion of the second material layer 236 is configured to be located within the limiting portion 232, thereby reducing the difficulty of connecting the fixing member 23 to the wall portion 211 while further improving the structural strength of the limiting portion 232, thereby reducing the risk of breakage or deformation of the limiting portion 232, thereby improving the assembly effect of the fixing member 23 on the electrode terminal 24. In addition, when the limiting portion 232 has the same strength, the thickness of the limiting portion 232 can be further reduced, which helps to further optimize the size of the fixing member 23 in the thickness direction X of the wall portion.

[0385] In some embodiments, see Figure 24 As shown, part of the first material layer 235 is located in the limiting portion 232 , and along the thickness direction X of the wall, at least part of the first material layer 235 and the second material layer 236 located in the limiting portion 232 overlap.

[0386] Part of the first material layer 235 is located in the limiting portion 232 , that is, the limiting portion 232 includes both the first material layer 235 and the second material layer 236 .

[0387] Along the thickness direction X of the wall portion, the first material layer 235 and the second material layer 236 located in the limiting portion 232 at least partially overlap, that is, in the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the first material layer 235 located in the limiting portion 232 and the orthographic projection of the second material layer 236 located in the limiting portion 232 at least partially overlap. For example, Figure 24 In the embodiment, the first material layer 235 and the second material layer 236 located in the limiting portion 232 completely overlap in the thickness direction X of the wall portion.

[0388] In this embodiment, by arranging the first material layer 235 and the second material layer 236 in the limiting portion 232, and the first material layer 235 and the second material layer 236 located in the limiting portion 232 at least partially overlap with each other in the thickness direction X of the wall portion, on the one hand, the contact area between the first material layer 235 and the second material layer 236 in the limiting portion 232 can be increased to reduce the difficulty of connecting the first material layer 235 and the second material layer 236 in the limiting portion 232, and on the other hand, the first material layer 235 and the second material layer 236 in the limiting portion 232 can be mutually constrained and reinforced, which is conducive to further improving the structural strength of the limiting portion 232.

[0389] In some embodiments, see Figure 24 As shown, part of the second material layer 236 is located in the base 231 , and along the thickness direction X of the wall, at least part of the first material layer 235 and the second material layer 236 located in the base 231 overlap.

[0390] Part of the first material layer 235 is located in the base 231 , and part of the second material layer 236 is located in the base 231 . That is, the base 231 includes both the first material layer 235 and the second material layer 236 .

[0391] Along the thickness direction X of the wall, the first material layer 235 and the second material layer 236 located in the base 231 at least partially overlap, that is, in the same plane perpendicular to the thickness direction X of the wall, the orthographic projection of the first material layer 235 located in the base 231 and the orthographic projection of the second material layer 236 located in the base 231 at least partially overlap. For example, Figure 24 In the embodiment, the first material layer 235 and the second material layer 236 located in the base 231 completely overlap in the thickness direction X of the wall.

[0392] In this embodiment, by arranging part of the first material layer 235 and part of the second material layer 236 in the base 231, and at least part of the first material layer 235 and the second material layer 236 located in the base 231 overlap, on the one hand, it is convenient for the first material layer 235 in the base 231 to be connected to the wall 211, and on the other hand, it can improve the structural strength of the base 231, which is beneficial to reduce the risk of breakage or deformation of the base 231, thereby improving the overall structural strength of the fixing member 23.

[0393] In some embodiments, see Figure 24 As shown, the base portion 231 and the limiting portion 232 are spaced apart along the thickness direction X of the wall portion. The fixing member 23 may further include a connecting portion 233 connecting the base portion 231 and the limiting portion 232. The first material layer 235 is partially located within the connecting portion 233, and the second material layer 236 is partially located within the connecting portion 233. Along the thickness direction X of the wall portion, the first material layer 235 and the second material layer 236 located within the connecting portion 233 at least partially overlap.

[0394] Part of the first material layer 235 is located in the connecting portion 233 , and part of the second material layer 236 is located in the connecting portion 233 . That is, the connecting portion 233 of the fixing member 23 includes both the first material layer 235 and the second material layer 236 .

[0395] Along the thickness direction X of the wall portion, the first material layer 235 and the second material layer 236 located in the connecting portion 233 at least partially overlap, that is, in the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the first material layer 235 located in the connecting portion 233 and the orthographic projection of the second material layer 236 located in the connecting portion 233 at least partially overlap. For example, Figure 24 In the embodiment, the first material layer 235 and the second material layer 236 located in the connecting portion 233 completely overlap in the thickness direction X of the wall portion.

[0396] It should be noted that in the embodiment where the connecting portion 233 includes a curved section 2331 and a straight section 2332, a portion of the first material layer 235 is located within the curved section 2331, a portion of the second material layer 236 is located within the curved section 2331, and a portion of the first material layer 235 is located within the straight section 2332, and a portion of the second material layer 236 is located within the straight section 2332.

[0397] In this embodiment, the fixing member 23 is further provided with a connecting portion 233, which connects the limiting portion 232 and the base 231 through the connecting portion 233, so as to facilitate the connection of the limiting portion 232 and the wall portion 211 to cooperate in clamping the electrode terminal 24, and can reduce the difficulty of assembly between the fixing member 23 and the wall portion 211, wherein, by arranging part of the first material layer 235 and part of the second material layer 236 in the connecting portion 233, and at least part of the first material layer 235 and the second material layer 236 located in the connecting portion 233 overlap, the structural strength of the connecting portion 233 can be improved, which is beneficial to reducing the risk of breakage or deformation of the connecting portion 233, so as to improve the overall structural strength of the fixing member 23.

[0398] According to some embodiments of the present application, see Figure 24 As shown, in the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the first material layer 235 and the orthographic projection of the second material layer 236 at least partially overlap. In other words, the first material layer 235 and the second material layer 236 are arranged in a structure that is at least partially stacked on top of each other in the thickness direction X of the wall portion.

[0399] It should be noted that the first material layer 235 and the second material layer 236 can be a structure that is only partially stacked in the thickness direction X of the wall. For example, the first material layer 235 and the second material layer 236 are only arranged in the limiting portion 232, and the first material layer 235 and the second material layer 236 located in the limiting portion 232 are stacked along the thickness direction X of the wall. Of course, the first material layer 235 and the second material layer 236 can also be a structure that is completely stacked in the thickness direction X of the wall.

[0400] In this embodiment, by setting the first material layer 235 and the second material layer 236 to a structure in which the projections in the thickness direction X of the wall portion at least partially overlap, on the one hand, the difficulty of connecting the first material layer 235 and the second material layer 236 can be reduced, thereby reducing the difficulty of forming the fixing part 23; on the other hand, the first material layer 235 and the second material layer 236 can be mutually constrained and reinforced, which is beneficial to improving the overall structural strength of the fixing part 23.

[0401] In some embodiments, see Figure 24 As shown, in the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the first material layer 235 and the orthographic projection of the second material layer 236 completely overlap.

[0402] In this embodiment, by setting the first material layer 235 and the second material layer 236 to a completely overlapping structure in the projection in the thickness direction X of the wall, on the one hand, the contact area between the first material layer 235 and the second material layer 236 can be further increased, so as to further reduce the difficulty of connecting the first material layer 235 and the second material layer 236, thereby further reducing the difficulty of forming the fixing part 23. On the other hand, the mutual constraint between the first material layer 235 and the second material layer 236 can be further strengthened, which is conducive to further improving the overall structural strength of the fixing part 23.

[0403] According to some embodiments of the present application, see Figure 24 As shown, along the thickness direction X of the wall portion, the second material layer 236 is located on the side of the first material layer 235 facing the wall portion 211. In other words, the first material layer 235 and the second material layer 236 are stacked along the thickness direction X of the wall portion, and the second material layer 236 is disposed facing the wall portion 211 in the thickness direction X of the wall portion.

[0404] In this embodiment, by setting the second material layer 236 to be located on the side of the first material layer 235 facing the wall portion 211, it is beneficial to improve the structural strength of the side of the limiting portion 232 facing the wall portion 211, thereby facilitating the assembly of the electrode terminal 24 by the fixing part 23, and helping to improve the structural stability of the electrode terminal 24 assembled on the wall portion 211.

[0405] Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, along the thickness direction X of the wall, the second material layer 236 is located on the side of the first material layer 235 away from the wall 211, and the first material layer 235 located in the base 231 is connected to the wall 211 to form a connection area. In the same plane perpendicular to the thickness direction X of the wall, the orthographic projection of the connection area and the orthographic projection of the second material layer 236 do not overlap.

[0406] Among them, the first material layer 235 located in the base 231 is welded to the wall portion 211 to form a weld mark, and the weld mark is the connection area formed by the first material layer 235 located in the base 231 and the wall portion 211 being connected to each other. Correspondingly, the projection of the weld mark formed by the welding connection between the first material layer 235 located in the base 231 and the wall portion 211 in the thickness direction X of the wall does not overlap with the projection of the second material layer 236 in the thickness direction X of the wall.

[0407] In this embodiment, by setting the second material layer 236 to be located on the side of the first material layer 235 away from the wall portion 211, and setting the connection area formed by the first material layer 235 and the wall portion 211 located in the base 231 to be connected to each other so that the projection in the thickness direction X of the wall portion does not overlap with the projection of the second material layer 236, the battery cell 20 adopting this structure can, on the one hand, increase the contact area between the first material layer 235 located in the base 231 and the wall portion 211, which is beneficial to improving the connection stability and reliability between the base 231 of the fixing member 23 and the wall portion 211; on the other hand, it can reduce the coverage and interference effect of the second material layer 236 on the connection position between the first material layer 235 located in the base 231 and the wall portion 211, which is beneficial to reducing the difficulty of connection between the first material layer 235 located in the base 231 and the wall portion 211.

[0408] According to some embodiments of this application, please continue to refer to Figure 24 As shown, the first material layer 235 and the second material layer 236 are stacked. Along the stacking direction of the first material layer 235 and the second material layer 236 , the thickness of the first material layer 235 is greater than the thickness of the second material layer 236 .

[0409] Exemplarily, the first material layer 235 and the second material layer 236 are stacked along the thickness direction X of the wall portion.

[0410] In this embodiment, by setting the thickness of the first material layer 235 to be greater than the thickness of the second material layer 236, it is helpful to increase the thickness of the area of ​​the base 231 used for interconnection with the wall portion 211, thereby helping to improve the connection stability and reliability between the fixing member 23 and the wall portion 211.

[0411] According to some embodiments of the present application, the melting point of the first material layer 235 is greater than or equal to 500° C. and less than or equal to 1000° C. The melting point of the second material layer 236 is greater than or equal to 1050° C. and less than or equal to 3500° C. The melting point of the wall portion 211 is greater than or equal to 500° C. and less than or equal to 1000° C.

[0412] The melting point of the first material layer 235 may be any one of 500° C., 550° C., 600° C., 650° C., 700° C., 750° C., 800° C., 850° C., 900° C., 950° C., or 1000° C., or a range between any two of them.

[0413] The melting point of the second material layer 236 can be any one of 1050°C, 1150°C, 1250°C, 1350°C, 1450°C, 1550°C, 1650°C, 1750°C, 1850°C, 1950°C, 2050°C, 2150°C, 2250°C, 2350°C, 2450°C, 2550°C, 2650°C, 2750°C, 2850°C, 2950°C, 3050°C, 3150°C, 3250°C, 3350°C, 3450°C or 3500°C, or a range between any two of them.

[0414] The melting point of the wall portion 211 may be any one of 500°C, 550°C, 600°C, 650°C, 700°C, 750°C, 800°C, 850°C, 900°C, 950°C or 1000°C, or a range between any two of them.

[0415] Optionally, the melting point of the first material layer 235 can be the same as the melting point of the wall portion 211, or the melting point of the first material layer 235 can be close to the melting point of the wall portion 211, so as to facilitate welding of the first material layer 235 and the wall portion 211, so that the connection between the first material layer 235 and the wall portion 211 is stable.

[0416] In this embodiment, the melting point of the first material layer 235 is set to be close to or the same as the melting point of the wall portion 211, so as to facilitate the assembly connection of the first material layer 235 and the wall portion 211, and the second material layer 236 has a higher melting point, has better high temperature resistance, and is not easily deformed by heat.

[0417] According to some embodiments of the present application, the hardness of the first material layer 235 is greater than or equal to 30 kgf / mm 2 , and less than or equal to 170kgf / mm 2 The hardness of the second material layer 236 is greater than or equal to 100 kgf / mm 2 , and less than or equal to 500kgf / mm 2 .

[0418] Optionally, the hardness of the first material layer 235 can be 30 kgf / mm 2 、40kgf / mm 2 、50kgf / mm 2 、60kgf / mm 2 、70kgf / mm 2 、80kgf / mm 2 、90kgf / mm 2 、100kgf / mm 2 、110kgf / mm 2 、120kgf / mm 2 、130kgf / mm2 、140kgf / mm 2 、150kgf / mm 2 、160kgf / mm 2 or 170kgf / mm 2 Any one of them or the range between any two of them.

[0419] Optionally, the hardness of the second material layer 236 can be 100 kgf / mm 2 、120kgf / mm 2 、140kgf / mm 2 、160kgf / mm 2 、180kgf / mm 2 , 200kgf / mm 2 , 220kgf / mm 2 , 240kgf / mm 2 、260kgf / mm 2 、280kgf / mm 2 、300kgf / mm 2 、320kgf / mm 2 、340kgf / mm 2 、360kgf / mm 2 、380kgf / mm 2 , 400kgf / mm 2 、420kgf / mm 2 、440kgf / mm 2 、460kgf / mm 2 、480kgf / mm 2 or 500kgf / mm 2 Any one of them or the range between any two of them.

[0420] In this embodiment, by setting the hardness of the first material layer 235 to 30 kgf / mm 2 Up to 170kgf / mm 2 , so that the first material layer 235 has better anti-deformation ability, and the hardness of the second material layer 236 is set to 100kgf / mm 2 Up to 500kgf / mm 2 , so that the second material layer 236 has better anti-deformation ability than the first material layer 235, and the overall anti-deformation ability of the structure formed by the second material layer 236 and the first material layer 235 is better, so as to limit the movement of the electrode terminal 24 relative to the wall portion 211 in the direction away from the electrode assembly 22.

[0421] According to some embodiments of the present application, see Figure 24As shown, the first material layer 235 in the base 231 is welded to the wall 211. That is, the fixing member 23 has a structure in which the first material layer 235 in the base 231 and the wall 211 are welded to each other to achieve connection of the fixing member 23 to the wall 211.

[0422] In this embodiment, a welding connection structure is used to connect the wall portion 211 and the first material layer 235 in the base 231 to improve the connection strength between the wall portion 211 and the base 231 and reduce the difficulty of connecting the wall portion 211 and the first material layer 235 in the base 231.

[0423] In some embodiments, the material of the first material layer 235 is the same as that of the wall portion 211 .

[0424] It should be noted that the material of the first material layer 235 is the same as the material of the wall portion 211, which means that the main component of the first material layer 235 is the same as the main component of the wall portion 211. For example, if the first material layer 235 and the wall portion 211 are both made of a single material, such as copper or aluminum, then the first material layer 235 and the wall portion 211 are composed of the same metal elements; if the first material layer 235 and the wall portion 211 are alloy materials or mixed materials, such as aluminum alloy or steel, then the material of the first material layer 235 and the wall portion 211 is the same, which means that the main components of the first material layer 235 and the wall portion 211 are the same. If the first material layer 235 and the wall portion 211 are different only in the content of the components, then they are also the same material.

[0425] In this embodiment, by setting the material of the first material layer 235 of the fixing member 23 to the same structure as the material of the wall portion 211, the base 231 and the wall portion 211 are welded with the same material, which is beneficial to reducing the difficulty of welding between the first material layer 235 in the base 231 and the wall portion 211, and can reduce the occurrence of welding defects between the base 231 and the wall portion 211, which is beneficial to improving the welding quality between the wall portion 211 and the base 231 of the fixing member 23.

[0426] According to some embodiments of the present application, see Figure 24 As shown, the first material layer 235 is compositely connected to the second material layer 236. In other words, the fixing member 23 is a composite material formed by compositely connecting the first material layer 235 and the second material layer 236. That is, the fixing member 23 is formed by compositely connecting two metals of different materials, for example, by hot pressing or cold pressing.

[0427] In this embodiment, by setting the first material layer 235 and the second material layer 236 of the fixing part 23 as a composite connection structure, on the one hand, the connection stability and reliability between the first material layer 235 and the second material layer 236 of the fixing part 23 can be improved, and on the other hand, the molding difficulty of the fixing part 23 can be reduced, which is conducive to improving the production efficiency of the fixing part 23.

[0428] In some embodiments, the base metal of the first material layer 235 and the base metal of the second material layer 236 are the same.

[0429] Among them, the base metal of the first material layer 235 and the base metal of the second material layer 236 are the same, that is, the first material layer 235 and the second material layer 236 are both alloy material structures, but the main components of the materials of the first material layer 235 and the second material layer 236 are the same, while the other components or contents are different. That is to say, if the first material layer 235 and the second material layer 236 are both single materials, then the first material layer 235 and the second material layer 236 are structures with different material hardness. If the first material layer 235 and the second material layer 236 are both alloy materials, then the first material layer 235 and the second material layer 236 can be structures with the same base metal or structures with different base metals. Similarly, if one of the first material layer 235 and the second material layer 236 is a single material and the other is an alloy material, then the base metal of the alloy material can be the same as or different from the metal of the single material. For example, if the first material layer 235 is aluminum, then the second material layer 236 can be an aluminum alloy with the same base metal, or it can be steel, copper alloy or titanium alloy with different base metals.

[0430] In this embodiment, by setting the base metal of the first material layer 235 and the base metal of the second material layer 236 to the same structure, so that the first material layer 235 and the second material layer 236 have the same main components, the connection difficulty between the first material layer 235 and the second material layer 236 can be reduced, thereby reducing the difficulty of forming the fixing part 23.

[0431] In some embodiments, the material of the first material layer 235 may be aluminum or an aluminum alloy, and correspondingly, the material of the second material layer 236 may be steel, stainless steel, copper, a copper alloy, titanium or a titanium alloy.

[0432] In some embodiments, the first material layer 235 may be made of steel or stainless steel, and correspondingly, the second material layer 236 may be made of titanium or a titanium alloy.

[0433] It should be noted that the structure of the fixing member 23 is not limited to this. In other embodiments, the second material layer 236 of the fixing member 23 can also be a non-metallic material with greater hardness. For example, the material of the second material layer 236 can also be ceramic, polymer plastic or carbon fiber reinforced composite material.

[0434] 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 interior forming a receiving cavity with an opening 2121 , and the electrode assembly 22 is received in the receiving cavity. The end cap 213 closes the opening 2121 and is a wall portion 211 .

[0435] Among them, the end cover 213 is the wall portion 211, that is, the fixing member 23 and the electrode terminal 24 are both arranged on the end cover 213 of the shell 21, and the limiting portion 232 of the fixing member 23 is a structure that cooperates with the end cover 213 of the shell 21 to clamp the assembly portion 242 of the electrode terminal 24.

[0436] In this embodiment, by setting the wall portion 211 of the outer shell 21 as the end cover 213 of the outer shell 21 for closing the opening 2121 of the shell 212, the battery cell 20 adopting this structure is convenient for assembling the electrode terminal 24 to the wall portion 211 through the fixing member 23, which is beneficial to reducing the assembly difficulty of 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 assembly difficulty between the electrode terminal 24 and the electrode assembly 22, thereby effectively reducing the assembly difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0437] It should be noted that the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 may also have other structures. For example, the outer shell 21 may include a shell 212 and an end cap 213. The shell 212 includes an integrally formed sidewall and wall portion 211. The sidewall is disposed around the wall portion 211. Along the thickness direction X of the wall portion, one end of the sidewall is connected to the wall portion 211, and the other end encloses an opening 2121. The sidewall and wall portion 211 jointly define a receiving cavity, and the electrode assembly 22 is received in the receiving cavity. The end cap 213 closes the opening 2121. In other words, the fixing member 23 and the electrode terminal 24 are both disposed on the bottom wall of the shell 212, which is disposed opposite the end cap 213 in the thickness direction X of the wall portion. The retaining portion 232 of the fixing member 23 is a structure that cooperates with the bottom wall of the shell 212 to clamp the assembly portion 242 of the electrode terminal 24.

[0438] The shell 212 includes an integrally formed side wall and wall portion 211 , that is, the side wall and wall portion 211 are an integral structure, and the side wall and wall portion 211 of the shell 212 are a structure made by an integral molding process, such as stamping or casting.

[0439] In this embodiment, by setting the wall portion 211 of the outer shell 21 as a wall of the shell 212 opposite to the end cover 213 in the thickness direction X of the wall portion, the battery cell 20 adopting this 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.

[0440] According to some embodiments of the present application, the present application further provides a battery device 100 , which includes a battery cell 20 according to any of the above solutions.

[0441] Among them, see Figure 2 As shown, the battery device 100 may further include a box body 10 , in which the battery cells 20 are accommodated.

[0442] 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 .

[0443] 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, 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 can 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.

[0444] 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 rectangular parallelepiped. Figure 2 In the embodiment, the box body 10 is a rectangular parallelepiped structure.

[0445] Optionally, the number of battery cells 20 disposed in the box 10 may be one or more. Figure 2In the embodiment, a battery device 100 is provided with a plurality of battery cells 20 within the housing 10. The plurality of battery cells 20 may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a configuration in which the plurality of battery cells 20 are connected both in series and in parallel. The plurality of battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery device 20 is housed within the housing 10. Alternatively, the battery device 100 may be formed by first connecting the plurality of battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, and then the plurality of battery modules are further connected in series, in parallel, or in a hybrid configuration to form an entire battery device, which is then housed within the housing 10.

[0446] The battery device 100 may further include other structures. For example, the battery device 100 may further include a busbar component, which connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0447] It should be noted that, in some embodiments, the battery device 100 may not be provided with a housing 10. The battery device 100 includes a plurality of battery cells 20. The battery device 100 composed of a plurality of battery cells 20 can 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 housing 10 can serve as part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the housing 10 can serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can become at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 can become at least a portion of the crossbeam and longitudinal beam of the vehicle 1000.

[0448] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery cell 20 of any of the above solutions, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0449] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0450] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0451] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include: a housing having a wall portion; an electrode assembly housed in the housing; an electrode terminal, disposed on the wall portion, the electrode terminal being electrically connected to the electrode assembly; a fixing member disposed on a peripheral side of the electrode terminal, the fixing member comprising a base portion and a limiting portion, the base portion being connected to the wall portion, the limiting portion being connected to the base portion and extending in a direction approaching the electrode terminal, the limiting portion being configured to limit movement of the electrode terminal in a direction away from the electrode assembly along a thickness direction of the wall portion; as well as a first insulating member, at least partially disposed between the electrode terminal and the limiting portion; Wherein, the thickness of the limiting portion is smaller than the thickness of the base.

2. The battery cell according to claim 1, wherein: Along the thickness direction of the wall portion, a portion of the electrode terminal is located between the limiting portion and the wall portion.

3. The battery cell according to claim 2, characterized in that: Along the thickness direction of the wall portion, a surface of the limiting portion facing the wall portion is farther away from the wall portion than a surface of the base portion facing the wall portion.

4. The battery cell according to claim 3, characterized in that Along the thickness direction of the wall portion, the surface of the limiting portion facing away from the wall portion is further away from the wall portion than the surface of the base portion facing away from the wall portion; Wherein, the fixing member further includes a connecting portion, and the connecting portion connects the base and the limiting portion.

5. The battery cell according to claim 4, characterized in that The limiting portion and the base portion are spaced apart from each other along a thickness direction of the wall portion.

6. The battery cell according to claim 4, characterized in that Along a direction perpendicular to the thickness direction of the wall portion, the base portion extends from the connecting portion in a direction away from the electrode terminal, and the limiting portion extends from the connecting portion in a direction close to the electrode terminal.

7. The battery cell according to claim 4, characterized in that In the same plane perpendicular to the thickness direction of the wall portion, an orthographic projection of the connecting portion and an orthographic projection of the electrode terminal do not overlap.

8. The battery cell according to claim 4, characterized in that The connecting portion includes a curved section and a straight section, the curved section is connected to the base portion, and the straight section is connected to the curved section and extends from the curved section toward the electrode terminal in a direction perpendicular to the thickness direction of the wall portion; In which, the surface of the straight section facing away from the wall portion is farther away from the wall portion in the thickness direction of the wall portion than the surface of the base portion facing away from the wall portion, and the limiting portion is connected to the end of the straight section facing the electrode terminal in a direction perpendicular to the thickness direction of the wall portion.

9. The battery cell according to claim 8, characterized in that Along the thickness direction of the wall portion, the surface of the limiting portion facing the wall portion is farther away from the wall portion than the surface of the straight section facing the wall portion, so as to form a thinning groove on the side of the limiting portion facing the wall portion, and a portion of the first insulating member is accommodated in the thinning groove.

10. The battery cell according to claim 8, characterized in that Along the thickness direction of the wall, the surface of the limiting portion facing away from the wall is closer to the wall than the surface of the straight section facing away from the wall, and part of the first insulating member is located on the side of the limiting portion facing away from the wall.

11. The battery cell according to claim 3, characterized in that Along the thickness direction of the wall portion, a surface of the limiting portion facing away from the wall portion is flush with a surface of the base portion facing away from the wall portion.

12. The battery cell according to claim 2, characterized in that: Along the thickness direction of the wall, the surface of the limiting portion facing away from the wall is closer to the wall than the surface of the base facing away from the wall, and part of the first insulating member is located on the side of the limiting portion facing away from the wall.

13. The battery cell according to claim 12, characterized in that: Along the thickness direction of the wall portion, a surface of the limiting portion facing the wall portion is flush with a surface of the base portion facing the wall portion.

14. The battery cell according to claim 2, characterized in that The electrode terminal includes: a main body portion, electrically connected to the electrode assembly; an assembly portion protruding from the outer peripheral surface of the main body, wherein a portion of the assembly portion is located between the limiting portion and the wall portion in the thickness direction of the wall portion; Wherein, along a direction perpendicular to the thickness direction of the wall portion, the limiting portion is located between the base portion and the main body portion, and a portion of the first insulating member is located between the limiting portion and the outer peripheral surface of the main body portion.

15. The battery cell according to claim 14, characterized in that The assembly portion surrounds the outer side of the main body portion.

16. The battery cell according to claim 14, 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, wherein the first limiting protrusion is accommodated in the first limiting groove.

17. The battery cell according to claim 16, 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 provided to the first limiting protrusions, and each first limiting groove is used to accommodate one first limiting protrusion.

18. The battery cell according to claim 16, characterized in that The first limiting protrusion is convexly provided on the outer peripheral surface of the main body, and the first limiting groove is provided on the first insulating member.

19. The battery cell according to claim 18, 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.

20. The battery cell according to claim 18, characterized in that Along the thickness direction of the wall portion, the first limiting protrusion is connected to the assembly portion, and the first limiting protrusion is located on a side of the assembly portion facing the limiting portion.

21. The battery cell according to claim 20, characterized in that Along the thickness direction of the wall portion, the first limiting protrusion and the limiting portion are spaced apart.

22. The battery cell according to claim 20, characterized in that In the same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the first limiting protrusion does not overlap with the orthographic projection of the limiting portion.

23. The battery cell according to claim 1, characterized in that The fixing member is arranged around the electrode terminal; Wherein, one of the limiting portion and the first insulating member is provided with a second limiting groove, and the other is provided with a second limiting protrusion, and the second limiting protrusion is accommodated in the second limiting groove.

24. The battery cell according to claim 23, characterized in that There are multiple second limiting grooves, and the multiple second limiting grooves are arranged at intervals along the circumference of the fixing member. The second limiting protrusions are correspondingly provided to the second limiting grooves, and each second limiting groove is used to accommodate one second limiting protrusion.

25. The battery cell according to claim 23, characterized in that The limiting portion is provided with the second limiting groove, and the first insulating member is provided with the second limiting protrusion.

26. The battery cell according to claim 25, characterized in that Along the thickness direction of the wall portion, the second limiting groove passes through both sides of the limiting portion.

27. The battery cell according to claim 1, characterized in that The limiting portion is arranged around the electrode terminal so that the limiting portion encloses and forms a lead-out hole; Wherein, along the thickness direction of the wall portion, the electrode terminal is inserted into the lead-out hole, and the electrode terminal extends out of the side of the limiting portion away from the wall portion.

28. The battery cell according to claim 1, characterized in that The fixing member is separately provided with the wall portion.

29. The battery cell according to claim 28, characterized in that The base portion is connected to the wall portion by welding.

30. The battery cell according to claim 1, characterized in that The fixing member is integrally formed with the wall portion.

31. The battery cell according to claim 1, characterized in that The thickness of the limiting portion is D1, and the thickness of the base portion is D2, satisfying 0.3D2≤D1≤0.8D2.

32. The battery cell according to claim 31, characterized in that 0.5mm≤D1≤1.5mm.

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

34. The battery cell according to claim 1, 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 limiting portion, and at least a portion of the base portion is accommodated in the mounting groove.

35. The battery cell according to claim 34, characterized in that The base is in contact with the bottom surface of the assembly groove, and the base is in contact with the side surface of the assembly groove.

36. The battery cell according to claim 1, characterized in that The fixing member is arranged around the electrode terminal.

37. The battery cell according to claim 1, characterized in that Along the thickness direction of the wall portion, the base portion is connected to a side of the wall portion facing away from the electrode assembly.

38. 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, and at least a portion of the second insulating member is provided between the wall portion and the electrode terminal.

39. The battery cell according to claim 38, characterized in that The wall portion is provided with a terminal hole, the terminal hole penetrating the wall portion along the thickness direction of the wall portion, a portion of the electrode terminal extending 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.

40. The battery cell according to any one of claims 1 to 39, characterized in that: The fixing member includes a first material layer and a second material layer connected to each other, a portion of the first material layer is located in the base, and a portion of the first material layer located in the base is connected to the wall; At least a portion of the second material layer is located within the limiting portion, and the hardness of the second material layer is greater than that of the first material layer.

41. The battery cell according to claim 40, characterized in that Part of the first material layer is located in the limiting portion, and along the thickness direction of the wall portion, at least parts of the first material layer and the second material layer located in the limiting portion overlap.

42. The battery cell according to claim 40, characterized in that A portion of the second material layer is located within the base portion, and along a thickness direction of the wall portion, at least a portion of the first material layer and the second material layer located within the base portion overlap.

43. The battery cell according to claim 40, characterized in that The base portion and the limiting portion are spaced apart along the thickness direction of the wall portion, and the fixing member further comprises a connecting portion, which connects the base portion and the limiting portion; Part of the first material layer is located in the connecting portion, and part of the second material layer is located in the connecting portion. Along the thickness direction of the wall portion, at least part of the first material layer and the second material layer located in the connecting portion overlap.

44. The battery cell according to claim 40, characterized in that In the same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the first material layer and the orthographic projection of the second material layer at least partially overlap.

45. The battery cell according to claim 44, characterized in that In the same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the first material layer and the orthographic projection of the second material layer completely overlap.

46. ​​The battery cell according to claim 44, characterized in that Along the thickness direction of the wall portion, the second material layer is located on a side of the first material layer facing the wall portion.

47. The battery cell according to claim 44, characterized in that Along the thickness direction of the wall portion, the second material layer is located on a side of the first material layer away from the wall portion; The first material layer in the base is connected to the wall to form a connection area, and in the same plane perpendicular to the thickness direction of the wall, the orthographic projection of the connection area and the orthographic projection of the second material layer do not overlap.

48. The battery cell according to claim 40, characterized in that The first material layer and the second material layer are stacked, and along a stacking direction of the first material layer and the second material layer, a thickness of the first material layer is greater than a thickness of the second material layer.

49. The battery cell according to claim 40, characterized in that The melting point of the first material layer is greater than or equal to 500° C. and less than or equal to 1000° C.; The melting point of the second material layer is greater than or equal to 1050° C. and less than or equal to 3500° C.; The melting point of the wall portion is greater than or equal to 500°C and less than or equal to 1000°C.

50. The battery cell according to claim 40, characterized in that The hardness of the first material layer is greater than or equal to 30 kgf / mm 2 , and less than or equal to 170kgf / mm 2 ; The hardness of the second material layer is greater than or equal to 100 kgf / mm 2 , and less than or equal to 500kgf / mm 2 .

51. The battery cell according to claim 40, characterized in that The first material layer located in the base is connected to the wall portion by welding.

52. The battery cell according to claim 51, characterized in that The material of the first material layer is the same as that of the wall portion.

53. The battery cell according to claim 40, characterized in that The first material layer and the second material layer are compositely connected.

54. The battery cell according to claim 40, characterized in that The base metal of the first material layer is the same as the base metal of the second material layer.

55. The battery cell according to claim 40, characterized in that The material of the first material layer is aluminum or aluminum alloy, and the material of the second material layer is steel, stainless steel, copper, copper alloy, titanium or titanium alloy.

56. The battery cell according to claim 40, characterized in that The first material layer is made of steel or stainless steel, and the second material layer is made of titanium or titanium alloy.

57. The battery cell according to claim 40, characterized in that The second material layer is made of ceramic, polymer plastic or carbon fiber reinforced composite material.

58. The battery cell according to claim 1, characterized in that The housing comprises: A housing having an opening formed therein, wherein the electrode assembly is accommodated in the housing; an end cap for closing the opening; Wherein, the end cover is the wall portion.

59. The battery cell according to claim 1, characterized in that The housing comprises: The housing includes an integrally formed sidewall and the wall portion, the sidewall being disposed around the wall portion, one end of the sidewall being connected to the wall portion along the thickness direction of the wall portion, and the other end of the sidewall being enclosed to form an opening, the sidewall and the wall portion jointly defining a housing cavity, and the electrode assembly being accommodated in the housing cavity; An end cap closes the opening.

60. A battery device, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 59.

61. An electrical device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 59, wherein the battery cell is used to provide electrical energy.

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