Battery cell, battery device, and electric device

Abstract

The present application belongs to the technical field of batteries. Provided are a battery cell, a battery device, and an electric device. The battery cell comprises a casing, an electrode assembly, an electrode terminal, a fixing member and a first insulating member. The electrode assembly is accommodated in the casing. The electrode terminal is disposed on a wall portion of the casing and is electrically connected to the electrode assembly. The fixing member is disposed on the peripheral side of the electrode terminal, and the fixing member comprises a base and a limiting portion, wherein the base is connected to the wall portion, the limiting portion is connected to the base and extends in a direction toward the electrode terminal, and the limiting portion is configured to prevent the electrode terminal from moving away from the electrode assembly in the direction of the thickness of the wall portion. At least part of the first insulating member is disposed between the electrode terminal and the limiting portion. The thickness of the limiting portion is less than the thickness of the base. Thus, a space between the limiting portion and the electrode terminal that accommodates the first insulating member can be enlarged while requirements for the connection strength between the base of the fixing member and the wall portion are met, thereby increasing a creepage distance between the limiting portion and the electrode terminal.

Description

Battery monomer, battery device and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery monomer, a battery device and an electric device. BACKGROUND

[0002] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Battery devices, as core components of new energy vehicles, have high requirements in terms of use performance and endurance. The battery monomer of the battery device usually includes a shell and an electrode assembly contained in the shell. In order to realize the input or output of the electric energy of the battery monomer, an electrode terminal is also insulatively installed on the shell. The electrode terminal is electrically connected with the electrode assembly to realize the input or output of the electric energy of the battery monomer. However, the existing battery monomer is prone to short circuit and other risks during use, resulting in low use reliability of the battery monomer.

[0003] SUMMARY

[0004] The embodiments of the present application provide a battery monomer, a battery device and an electric device, which can effectively improve the use reliability of the battery monomer.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, 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 contained in the shell. The electrode terminal is arranged on the wall portion, and the electrode terminal is electrically connected with the electrode assembly. The fixing member is arranged on the periphery of the electrode terminal. The fixing member includes a base portion and a limiting portion. The base portion is connected to the wall portion, and the limiting portion is connected to the base portion and extends in a direction close to the electrode terminal. 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 part 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 portion.

[0006] In the technical scheme, the wall of the shell is connected with the fixing member, the fixing member is provided with a base and a limiting portion, the base is connected with the wall, the limiting portion is connected with the base and extends towards the electrode terminal, and at least part of the first insulating member is arranged between the limiting portion and the electrode terminal, so that the limiting portion and the wall can clamp and assemble the electrode terminal to limit the movement of the electrode terminal along the thickness direction of the wall 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 portion and the electrode terminal is realized through the first insulating member. In the technical scheme, the thickness of the limiting portion of the fixing member used for limiting the assembly of the electrode terminal is set to be smaller than the thickness of the base of the fixing member used for connecting with the wall, so that the space for accommodating the first insulating member between the limiting portion and the electrode terminal can be expanded while meeting the requirements of the connection quality and the connection strength of the base of the fixing member and the wall, thereby the thickness of the part of the first insulating member arranged between the limiting portion and the electrode terminal can be improved to increase the creepage distance between the limiting portion and the electrode terminal, and the short circuit phenomenon of the limiting portion and the electrode terminal in use can be effectively alleviated, which is beneficial to reduce the short circuit risk of the battery monomer in use and improve the use reliability of the battery monomer.

[0007] In some embodiments, along the thickness direction of the wall, part of the electrode terminal is located between the limiting portion and the wall.

[0008] In the technical scheme, part of the electrode terminal is arranged between the limiting portion and the wall in the thickness direction of the wall, so that part of the limiting portion and part of the wall are respectively located on both sides of the part of the electrode terminal in the thickness direction of the wall, thereby the clamping and assembly effect of the limiting portion and the wall on the electrode assembly can be improved to improve the effect of the limiting portion on limiting the movement of the electrode terminal along the thickness direction of the wall away from the electrode assembly, and the stability and firmness of the assembly of the electrode terminal on the wall can be improved.

[0009] In some embodiments, along the thickness direction of the wall, the surface of the limiting portion facing the wall is farther away from the wall than the surface of the base facing the wall.

[0010] In the technical scheme, the surface of the limiting portion facing the wall is set to be farther away from the wall than the surface of the base facing the wall, so that the part of the electrode terminal located between the limiting portion and the wall can share part of the space in the thickness direction of the wall with the fixing member, thereby the space occupied by the fixing member and the electrode terminal in the thickness direction of the wall can be effectively saved while meeting the creepage distance between the electrode terminal and the limiting portion and the connection reliability between the base and the wall, so as to save the space occupied by the battery monomer in the thickness direction of the wall, and thereby the energy density of the battery monomer can be improved.

[0011] In some embodiments, along the thickness direction of the wall portion, the surface of the limiting portion away from the wall portion is farther away from the wall portion than the surface of the base portion away from the wall portion; wherein the fixing member further comprises a connecting portion connecting the base portion and the limiting portion.

[0012] In the above technical solution, the surface of the limiting portion away from the wall portion is farther away from the wall portion than the surface of the base portion away from the wall portion in the thickness direction of the wall portion, so that the limiting portion is a structure protruding from the side of the base portion away from the wall portion. By arranging the connecting portion between the base portion and the limiting portion, on the one hand, it is beneficial to reduce the connection difficulty between the base portion and the limiting portion, and can improve the connection stability between the base portion and the limiting portion, and on the other hand, while realizing the pressing of the electrode terminal by the limiting portion and meeting the connection quality between the base portion and the wall portion, the thickness of the base portion in the thickness direction of the wall portion does not need to be increased, which is beneficial to reduce the manufacturing cost of the fixing member and can reduce the weight of the fixing member.

[0013] In some embodiments, the limiting portion and the base portion are arranged spaced apart in the thickness direction of the wall portion.

[0014] In the above technical solution, by arranging the limiting portion and the base portion to be spaced apart in the thickness direction of the wall portion, it is beneficial to reduce the difficulty of assembling part of the electrode terminal between the limiting portion and the wall portion, and can reduce the forming difficulty of the connecting portion connecting the limiting portion and the base portion.

[0015] In some embodiments, along a direction perpendicular to the thickness direction of the wall portion, the base portion extends from the connecting portion to a direction away from the electrode terminal, and the limiting portion extends from the connecting portion to a direction close to the electrode terminal.

[0016] In the above technical solution, by arranging the limiting portion to extend from one side of the connecting portion to a direction close to the electrode terminal, and arranging the base portion to extend from the other side of the connecting portion to a direction away from the electrode terminal, the cross section of the fixing member is in a "Z" shape structure, so that on the one hand, the structure of the fixing member can be optimized, which is beneficial to reduce the difficulty of connecting the fixing member to the wall portion, on the other hand, the interference between the base portion and the electrode terminal can be reduced, and the phenomenon that the base portion occupies the space between the wall portion and the limiting portion can be reduced, so that the limiting portion and the wall portion can be conveniently assembled to clamp the electrode terminal, and the space occupied by the fixing member and the electrode terminal in the thickness direction of the wall portion can be optimized.

[0017] In some embodiments, in the same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the connecting portion and the orthographic projection of the electrode terminal do not overlap.

[0018] In the above technical solution, by setting the connecting portion and the electrode terminal to a structure in which the projections of the connecting portion and the electrode terminal in the thickness direction of the wall portion do not overlap, interference between the connecting portion and the electrode terminal can be reduced, the creepage distance between the connecting portion and the electrode terminal can be increased, and the risk of short circuit between the connecting portion and the electrode terminal can be reduced.

[0019] In some embodiments, the connecting portion includes a curved segment connected to the base portion and extending in a direction perpendicular to the thickness direction of the wall portion, and a straight segment connected to the curved segment and extending from the curved segment toward the electrode terminal; wherein the surface of the straight segment 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 away from the wall portion, and the limiting portion is connected to an end of the straight segment facing the electrode terminal in a direction perpendicular to the thickness direction of the wall portion.

[0020] In the above technical solution, the connecting portion is provided with a curved segment and a straight segment connected to each other, the curved segment is connected to the base portion, the straight segment extends from the curved segment toward the electrode terminal in a direction perpendicular to the thickness direction of the wall portion, and the limiting portion is connected to an end of the straight segment facing the electrode terminal, so that the surface of the limiting portion facing the wall portion and the surface of the straight segment facing the wall portion can be farther away from the wall portion than the surface of the base portion facing the wall portion. The fixing member with this structure can facilitate the connection between the connecting portion and the limiting portion, reduce the connection difficulty between the connecting portion and the limiting portion, improve the connection strength between the limiting portion and the connecting portion, make the force of the limiting portion pressing the electrode terminal be a structure acting on the straight segment of the connecting portion, improve the overall structural strength of the fixing member, and improve the effect of the limiting portion of the fixing member pressing the electrode terminal.

[0021] 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 segment facing the wall portion, so as to form a thinning groove on the side of the limiting portion facing the wall portion, and part of the first insulating member is accommodated in the thinning groove.

[0022] In the technical solution, the surface of the limiting portion facing the wall portion is arranged to be farther away from the wall portion in the thickness direction of the wall portion than the surface of the flat section facing the wall portion, so that the side of the limiting portion facing the wall portion can form a thinning groove, 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 in the thickness direction of the wall portion can be expanded, so that the flat section of the connecting portion and the first insulating member share part of the space in the thickness direction of the wall portion, thereby reducing the overall size of the fixing member, the first insulating member and the electrode terminal in the thickness direction of the wall portion, so that the thickness of the part of the first insulating member between the limiting portion and the electrode terminal in the thickness direction of the wall portion remains unchanged, and the insulation isolation of the limiting portion and the electrode terminal is satisfied, the spacing between the limiting portion and the wall portion in the thickness direction of the wall portion can be reduced, the size of the fixing member in the thickness direction of the wall portion is optimized, the size of the electrode terminal in the thickness direction of the wall portion is optimized, and the space occupied by the electrode terminal and the fixing member for assembling the electrode terminal in the thickness direction of the wall portion is reduced, thereby saving the space occupied by the battery monomer in the thickness direction of the wall portion, and the energy density of the battery monomer is improved.

[0023] In some embodiments, along the thickness direction of the wall portion, the surface of the limiting portion away from the wall portion is closer to the wall portion than the surface of the flat section away from the wall portion, and part of the first insulating member is located on the side of the limiting portion away from the wall portion.

[0024] In the technical solution, the surface of the limiting portion away from the wall portion is arranged to be closer to the wall portion in the thickness direction of the wall portion than the surface of the flat section away from the wall portion, so that the side of the limiting portion away from the wall portion can form a thinning groove, and part of the first insulating member is located on the side of the limiting portion away from the wall portion, so that on the one hand, the first insulating member can be arranged 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 improve the assembly stability between the first insulating member and the fixing member, and on the other hand, while improving the insulation isolation effect of the first insulating member on the limiting portion and the electrode terminal, the flat 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 monomer.

[0025] In some embodiments, along the thickness direction of the wall portion, the surface of the limiting portion away from the wall portion is flush with the surface of the base portion away from the wall portion.

[0026] In the technical solution, the surface of the limiting portion away from the wall portion and the surface of the base portion away from the wall portion are arranged to be coplanar, so that the fixing member is partially thinned on the side facing the wall portion to form the limiting portion, and the region of the fixing member that is not thinned is the base portion, thereby achieving that the thickness of the limiting portion is less than the thickness of the base portion, the structure is simple, and the manufacturing is convenient, which is beneficial to reduce the processing difficulty of the fixing member.

[0027] In some embodiments, along the thickness direction of the wall portion, the surface of the limiting portion away from the wall portion is closer to the wall portion than the surface of the base portion away from the wall portion, and part of the first insulating member is located on the side of the limiting portion away from the wall portion.

[0028] In the technical solution, the surface of the limiting portion away from the wall portion is arranged to be closer to the wall portion in the thickness direction of the wall portion than the surface of the base portion away from the wall portion, so that the fixing member is partially thinned on the side away from the wall portion, and part of the first insulating member is located on the side of the limiting portion away from the wall portion, thereby on the one hand, the first insulating member is arranged to cover at least part of the limiting portion, which is beneficial to further improve the insulation and isolation effect between the limiting portion and the electrode terminal, and is beneficial to improve the assembly stability between the first insulating member and the fixing member, and on the other hand, while improving the effect of the first insulating member insulating and isolating the limiting portion and the electrode terminal, the base portion 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 monomer.

[0029] In some embodiments, along the thickness direction of the wall portion, the surface of the limiting portion facing the wall portion is flush with the surface of the base portion facing the wall portion.

[0030] In the technical solution, the surface of the limiting portion away from the wall portion and the surface of the base portion away from the wall portion are arranged to be coplanar, so that the fixing member is partially thinned on the side facing the wall portion to form the limiting portion, and the region of the fixing member that is not thinned is the base portion, thereby achieving that the thickness of the limiting portion is less than the thickness of the base portion, the structure is simple, and the manufacturing is convenient, which is beneficial to reduce the processing difficulty of the fixing member.

[0031] In some embodiments, the electrode terminal comprises a body portion and an assembly portion; the body portion is electrically connected with the electrode assembly; the assembly portion is protruded on the outer peripheral surface of the body portion, and part of the assembly portion is located between the limiting portion and the wall portion in the thickness direction of the wall portion; along the direction perpendicular to the thickness direction of the wall portion, the limiting portion is located between the base portion and the body portion, and part of the first insulating member is located between the limiting portion and the outer peripheral surface of the body portion.

[0032] In the technical scheme, the electrode terminal is provided with a body part and an assembling part, the assembling part of the electrode terminal is a structure protruding on the outer circumferential surface of the body part, and the limiting part is located between the base part and the body part in the direction perpendicular to the thickness direction of the wall part, so that the assembling part is extended between the wall part and the limiting part, and part of the electrode terminal is located between the wall part and the limiting part, the structure is simple, and the wall part and the limiting part are matched to limit the assembling part.

[0033] In some embodiments, the assembling part surrounds the outside of the body part.

[0034] In the technical scheme, the assembling part is arranged in the annular structure surrounding the outside of the body part, so that the wall part and the limiting part can be matched to clamp and limit at any position of the body part in the circumferential direction, so that the electrode terminal does not need to be positioned or rotated to adjust the angle during the assembling of the electrode terminal, thereby facilitating the difficulty of assembling the assembling part of the electrode terminal between the wall part and the limiting part, and facilitating the stability and reliability of the electrode terminal assembled on the wall part.

[0035] In some embodiments, one of the body part and the first insulating part 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.

[0036] In the technical scheme, the first limiting protrusion is arranged on one of the body part and the first insulating part, and the first limiting groove is arranged on the other, so that the first limiting groove and the first limiting protrusion can be matched to limit the rotation of the electrode terminal relative to the first insulating part, to achieve the circumferential locking between the body part and the first insulating part, which facilitates to alleviate the phenomenon that the electrode terminal rotates relative to the first insulating part around the axis extending along the thickness direction of the wall part, on the one hand, the assembling precision between the electrode terminal and the first insulating part can be improved, and the assembling difficulty between the electrode terminal and the first insulating part can be reduced, and on the other hand, the structural stability of the electrode terminal assembled on the wall part can be improved.

[0037] In some embodiments, the first limiting protrusion is a plurality of first limiting protrusions, and the first limiting protrusions are arranged at intervals in the circumferential direction of the body part, and the first limiting groove is correspondingly arranged with the first limiting protrusion, and each first limiting groove is used to accommodate one first limiting protrusion.

[0038] In the technical scheme, the first limiting protrusion is arranged in a plurality of structures, and the first limiting protrusions are arranged at intervals in the circumferential direction of the body part, and each first limiting protrusion is correspondingly inserted into a first limiting groove, and the battery monomer with this structure can further improve the limiting effect of the circumferential locking between the electrode terminal and the first insulating part, thereby facilitating to further alleviate the phenomenon that the electrode terminal rotates relative to the first insulating part around the axis extending along the thickness direction of the wall part.

[0039] In some embodiments, the first limiting protrusion is arranged on the outer circumferential surface of the body portion, and the first insulating member is provided with the first limiting groove.

[0040] In the above technical solution, the first limiting protrusion is arranged on the outer circumferential surface of the body portion, and the first limiting groove is arranged on the first insulating member. The battery monomer with this structure does not need to be slotted on the body portion of the electrode terminal, which is conducive to improving the structural strength of the electrode terminal and the overcurrent capacity of the electrode terminal.

[0041] In some embodiments, the size of the first limiting protrusion protruding from the outer circumferential surface of the body portion is smaller than the size of the assembly portion protruding from the outer circumferential surface of the body portion.

[0042] In the above technical solution, by setting the size of the first limiting protrusion protruding from the outer circumferential surface of the body portion to be smaller than the size of the assembly portion protruding from the outer circumferential surface of the body portion, the interference phenomenon between the first limiting protrusion and the base portion of the fixing member is alleviated, and the space occupied by the first limiting protrusion in the radial direction of the electrode terminal is saved, so as to alleviate the phenomenon that the thickness of the part of the first insulating member between the first limiting protrusion and the fixing member is too small to cause poor insulation effect.

[0043] 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 the side of the assembly portion facing the limiting portion.

[0044] In the above technical solution, by connecting the first limiting protrusion to the side of the assembly portion facing the limiting portion in the thickness direction of the wall portion, on the one hand, the difficulty of arranging the first limiting groove on the first insulating member is reduced, and the assembly difficulty between the electrode terminal and the first insulating member is reduced, and on the other hand, the first limiting protrusion can utilize the space between the assembly portion and the limiting portion in the thickness direction of the wall portion, without increasing the distance between the limiting portion and the wall portion to avoid the first limiting protrusion, thereby saving the space occupied by the fixing member and the wall portion in the thickness direction of the wall portion, and optimizing the size of the battery monomer in the thickness direction of the wall portion.

[0045] In some embodiments, along the thickness direction of the wall portion, the first limiting protrusion is spaced apart from the limiting portion.

[0046] In the above technical solution, by arranging the first limiting protrusion and the limiting portion to be spaced apart in the thickness direction of the wall portion, the interference phenomenon between the first limiting protrusion and the limiting portion is reduced, and the first insulating member can be arranged between the first limiting protrusion and the limiting portion, thereby reducing the short circuit risk between the first limiting protrusion and the fixing member.

[0047] In some embodiments, a projection of the first limiting protrusion in a same plane perpendicular to a thickness direction of the wall portion does not overlap with a projection of the limiting portion.

[0048] In the above technical solution, by setting the first limiting protrusion and the limiting portion as a structure in which projections in a thickness direction of the wall portion do not overlap, on one hand, interference 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.

[0049] In some embodiments, the fixing member surrounds the electrode terminal; 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.

[0050] In the above technical solution, by setting the fixing member as a structure surrounding the electrode terminal, and setting one of the first insulating member and the limiting portion with the second limiting protrusion and the other with the second limiting groove, the second limiting protrusion and the second limiting groove can cooperate to limit rotation of the fixing member relative to the first insulating member, so as to achieve circumferential locking between the fixing member and the first insulating member, which is conducive to relieving the phenomenon of rotation of the fixing member relative to the first insulating member about an axis extending in the thickness direction of the wall portion, on one hand, the assembly precision between the fixing member and the first insulating member can be improved, and the assembly difficulty between the fixing member and the first insulating member can be reduced, and on the other hand, the structural stability and reliability of the fixing member connected to the wall portion can be improved.

[0051] In some embodiments, the second limiting groove is a plurality of second limiting grooves, the plurality of second limiting grooves are arranged at intervals in a circumferential direction of the fixing member, and the second limiting protrusion is correspondingly arranged with the second limiting groove, and each second limiting groove is used for accommodating one second limiting protrusion.

[0052] In the above technical solution, by setting the second limiting groove as a plurality of second limiting grooves arranged at intervals in the circumferential direction of the fixing member, and each second limiting groove is used for inserting one second limiting protrusion, the battery monomer adopting this structure can further improve the limiting effect of circumferential locking between the fixing member and the first insulating member, thereby being conducive to further relieving the phenomenon of rotation of the fixing member relative to the first insulating member about an axis extending in the thickness direction of the wall portion.

[0053] 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.

[0054] In the technical scheme, the second limiting groove is arranged on the limiting portion, and correspondingly, the second limiting protrusion is arranged on the first insulating piece. The battery monomer with the structure has the advantages that: on the one hand, the second limiting groove is easy to be machined on the limiting portion, and the second limiting protrusion on the first insulating piece is easy to be assembled in the second limiting groove, thereby reducing the manufacturing difficulty of the battery monomer; on the other hand, the second limiting protrusion does not occupy the space of the limiting portion, thereby relieving the interference between the second limiting protrusion and the electrode terminal.

[0055] In some embodiments, the second limiting groove penetrates through both sides of the limiting portion along the thickness direction of the wall portion.

[0056] In the technical scheme, the second limiting groove is arranged on the limiting portion, and correspondingly, the second limiting protrusion is arranged on the first insulating piece. The battery monomer with the structure has the advantages that: on the one hand, the second limiting groove is easy to be machined on the limiting portion, and the second limiting protrusion on the first insulating piece is easy to be assembled in the second limiting groove, thereby reducing the manufacturing difficulty of the battery monomer; on the other hand, the second limiting protrusion does not occupy the space of the limiting portion, thereby relieving the interference between the second limiting protrusion and the electrode terminal.

[0057] In some embodiments, the limiting portion is arranged around the electrode terminal, so that the limiting portion encloses the lead-out hole; and the electrode terminal is arranged in the lead-out hole along the thickness direction of the wall portion, and extends out of the side of the limiting portion away from the wall portion.

[0058] In the technical scheme, the electrode terminal is arranged in the lead-out hole along the thickness direction of the wall portion, and extends out of the side of the limiting portion away from the wall portion, so that the electrode terminal is easy to be assembled and connected with other components, thereby reducing the difficulty of the electrode terminal outputting or inputting the electric energy of the battery monomer. In addition, the thickness of the limiting portion is smaller than the thickness of the base portion, so that the size of the part of the electrode terminal arranged in the lead-out hole along the thickness direction of the wall portion is reduced while meeting the connection requirement of the base portion and the wall portion, thereby saving the space occupied by the fixing member and the wall portion along the thickness direction of the wall portion, and optimizing the size of the battery monomer along the thickness direction of the wall portion.

[0059] In some embodiments, the fixing member and the wall portion are arranged separately.

[0060] In the technical scheme, the fixing member and the wall portion are arranged separately, so that the difficulty of arranging the fixing member on the wall portion is reduced, and the first insulating piece is easy to be assembled between the fixing member and the electrode terminal, thereby reducing the assembly difficulty of the battery monomer.

[0061] In some embodiments, the base portion and the wall portion are welded.

[0062] In the 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 assembly difficulty between the fixing member and the wall.

[0063] In some embodiments, the fixing member is integrally formed with the wall.

[0064] In the technical solution, the fixing member and the wall are integrally formed by an integral forming process, which can improve the connection strength and stability between the fixing member and the wall, and improve the stability of the limiting portion of the fixing member and the wall in assembling the electrode terminal, thereby improving the reliability of the electrode terminal assembled on the wall.

[0065] 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.

[0066] In the technical solution, the ratio of the thickness of the limiting portion to the thickness of the base is set to 0.3 to 0.8. On the one hand, the thickness of the limiting portion is set to be greater than or equal to 0.3 times the thickness of the base, which improves the structural strength of the limiting portion and helps to reduce the risk of cracking or deformation of the limiting portion during use, thereby improving the stability and reliability of the fixing member in assembling the electrode terminal. On the other hand, the thickness of the limiting portion is set to be less than or equal to 0.8 times the thickness of the base, which can further expand the space between the limiting portion and the electrode terminal for accommodating the first insulating member, thereby further improving the thickness of the part of the first insulating member between the limiting portion and the electrode terminal, and increasing the creepage distance between the limiting portion and the electrode terminal to further alleviate the short circuit phenomenon of the limiting portion and the electrode terminal during use.

[0067] In some embodiments, the thickness of the limiting portion is D1, satisfying 0.5mm≤D1≤1.5mm.

[0068] In the technical solution, the thickness of the limiting portion is set to 0.5mm to 1.5mm, which can improve the structural strength of the limiting portion to reduce the risk of cracking or deformation of the limiting portion during use, and can save the space occupied by the limiting portion, which is beneficial to optimize the overall size of the fixing member, the first insulating member and the electrode terminal in the thickness direction of the wall, and improve the space utilization of the battery monomer.

[0069] In some embodiments, at least part of the limiting portion is embedded in the first insulating piece, and part of the first insulating piece is located on the side of the limiting portion away from the wall portion along the thickness direction of the wall portion.

[0070] In the above technical solution, by embedding at least part of the limiting portion of the fixing piece in the first insulating piece, and locating part of the first insulating piece on the side of the limiting portion away from the wall portion, the first insulating piece is a structure wrapped on the outside of at least part of the limiting portion, thereby further improving the connection strength of the fixing piece and the first insulating piece, improving the assembly stability and firmness between the fixing piece and the first insulating piece, and further reducing the risk of falling between the first insulating piece and the fixing piece, which is beneficial to improving the assembly quality of the battery monomer.

[0071] In some embodiments, a fitting groove is arranged on the side of the wall portion facing the limiting portion along the thickness direction of the wall portion, and at least part of the base portion is accommodated in the fitting groove.

[0072] In the above technical solution, by arranging the fitting groove for accommodating the base portion on the side of the wall portion facing the limiting portion, at least part of the base portion of the fixing piece can be inserted into the fitting groove, which is beneficial to further saving the space occupied by the fixing piece and the wall portion in the thickness direction of the wall portion, and reducing the assembly difficulty between the wall portion and the base portion of the fixing piece.

[0073] In some embodiments, the base portion abuts against the groove bottom surface of the fitting groove, and the base portion abuts against the groove side surface of the fitting groove.

[0074] In the above technical solution, by arranging the base portion of the fixing piece to abut against the groove bottom surface and the groove side surface of the fitting groove, the fitting groove can also limit and position the base portion of the fixing piece, which can improve the precision of the fixing piece assembled on the wall portion, reduce the connection difficulty between the fixing piece and the wall portion, and further improve the structural stability and reliability of the fixing piece assembled on the wall portion.

[0075] In some embodiments, the fixing piece surrounds the electrode terminal.

[0076] In the above technical solution, by arranging the fixing piece in a ring structure surrounding the electrode terminal, the fixing piece can be matched with the wall portion at any position in the circumferential direction of the fixing piece to assemble the electrode terminal, so that the fixing piece does not need to be positioned or rotated to adjust the angle during the mutual assembly of the fixing piece and the electrode terminal, thereby reducing the assembly difficulty between the fixing piece and the wall portion and between the fixing piece and the electrode terminal, and improving the stability and reliability of the electrode terminal assembled on the wall portion.

[0077] In some embodiments, the base is connected to a side of the wall away from the electrode assembly along a thickness direction of the wall.

[0078] In the above technical solution, the base of the fixing member is connected to the side of the wall away from the electrode assembly, and the limiting portion of the fixing member is configured to assemble the electrode terminal to the wall from the side of the wall away from the electrode assembly. With this structure, the battery monomer can reduce the connection difficulty between the fixing member and the wall, facilitate the assembly of the electrode terminal, and reduce the difficulty of assembling the electrode terminal to the wall.

[0079] In some embodiments, the battery monomer further comprises a second insulating member, and at least part of the second insulating member is arranged between the wall and the electrode terminal along a thickness direction of the wall.

[0080] In the above technical solution, the battery monomer further comprises a second insulating member, and at least part of the second insulating member is arranged between the wall and the electrode terminal, so that the wall and the electrode terminal can be insulated and isolated by the second insulating member, thereby reducing the risk of short circuit between the electrode terminal and the wall.

[0081] In some embodiments, the wall is provided with a terminal hole, the terminal hole penetrates the wall along a thickness direction of the wall, part of the electrode terminal extends into the terminal hole, and the part of the electrode terminal extending into the terminal hole is electrically connected with the electrode assembly; wherein the second insulating member is arranged around the terminal hole, and the second insulating member is further configured to seal the gap between the wall and the electrode terminal.

[0082] In the above technical solution, the wall is further provided with a terminal hole for inserting the electrode terminal, so as to facilitate the electrical connection between the electrode terminal and the electrode assembly accommodated in the shell. The second insulating member is arranged around the terminal hole, so that the second insulating member can also seal the gap between the wall and the electrode terminal, thereby reducing the risk of liquid leakage at the terminal hole of the battery monomer.

[0083] In some embodiments, the fixing member comprises a first material layer and a second material layer connected to each other, part of the first material layer is located in the base, and the part of the first material layer located in the base is connected to the wall; wherein at least part of the second material layer is located in the limiting portion, and the hardness of the second material layer is greater than the hardness of the first material layer.

[0084] In the technical scheme, the fixing member is provided with the first material layer and the second material layer, and the hardness of the second material layer is greater than that of the first material layer, so that the material of the first material layer is the same as or similar to that of the wall portion, the part of the fixing member in the base portion is connected with the wall portion through the first material layer, the connection difficulty between the fixing member and the wall portion is reduced, at least part of the second material layer is arranged in the limiting portion, the structural strength of the limiting portion is further improved, the risk of fracture or deformation of the limiting portion is reduced, the assembly effect of the fixing member on the electrode terminal is improved, and the thickness of the limiting portion is further reduced under the condition that the limiting portion has the same strength, and the size of the fixing member in the thickness direction of the wall portion is further optimized.

[0085] In some embodiments, part of the first material layer is located in the limiting portion, and at least part of the first material layer and the second material layer located in the limiting portion overlap in the thickness direction of the wall portion.

[0086] In the technical scheme, the first material layer and the second material layer are arranged in the limiting portion, and at least part of the first material layer and the second material layer in the thickness direction of the wall portion overlap with each other, which can increase the contact area between the first material layer and the second material layer in the limiting portion, reduce the connection difficulty of the first material layer and the second material layer in the limiting portion, and realize mutual constraint and strengthening of the first material layer and the second material layer in the limiting portion, thereby further improving the structural strength of the limiting portion.

[0087] In some embodiments, part of the second material layer is located in the base portion, and at least part of the first material layer and the second material layer located in the base portion overlap in the thickness direction of the wall portion.

[0088] In the technical scheme, part of the first material layer and part of the second material layer are arranged in the base portion, and at least part of the first material layer and the second material layer located in the base portion overlap with each other, which facilitates mutual connection of the first material layer in the base portion and the wall portion, improves the structural strength of the base portion, and reduces the risk of fracture or deformation of the base portion, thereby improving the overall structural strength of the fixing member.

[0089] In some embodiments, the base portion and the limiting portion are arranged in the thickness direction of the wall portion, the fixing member further comprises a connecting portion connecting the base portion and the limiting portion, part of the first material layer is located in the connecting portion, part of the second material layer is located in the connecting portion, and at least part of the first material layer and the second material layer located in the connecting portion overlap in the thickness direction of the wall portion.

[0090] In the technical solution, the fixing member is further provided with a connecting portion, the limiting portion and the base portion are connected through the connecting portion, so as to facilitate the cooperation of the limiting portion and the wall portion in clamping the electrode terminal and reduce the assembly difficulty between the fixing member and the wall portion. The first material layer and the second material layer are arranged in the connecting portion, and at least part of the first material layer and the second material layer in the connecting portion overlaps, so as to improve the structural strength of the connecting portion, reduce the risk of fracture or deformation of the connecting portion, and improve the overall structural strength of the fixing member.

[0091] In some embodiments, the first material layer and the second material layer overlap at least partially in the same plane perpendicular to the thickness direction of the wall portion.

[0092] In the technical solution, the first material layer and the second material layer are arranged to overlap at least partially in the projection direction of the wall portion. On the one hand, the connection difficulty of the first material layer and the second material layer is reduced, the forming difficulty of the fixing member is reduced, and on the other hand, the first material layer and the second material layer are constrained and strengthened, which is beneficial to improve the overall structural strength of the fixing member.

[0093] In some embodiments, the first material layer and the second material layer overlap completely in the same plane perpendicular to the thickness direction of the wall portion.

[0094] In the technical solution, the first material layer and the second material layer are arranged to overlap completely in the projection direction of the wall portion. On the one hand, the contact area between the first material layer and the second material layer is further increased, the connection difficulty of the first material layer and the second material layer is further reduced, the forming difficulty of the fixing member is further reduced, and on the other hand, the mutual constraint between the first material layer and the second material layer is further strengthened, which is beneficial to further improve the overall structural strength of the fixing member.

[0095] 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 the wall portion.

[0096] In the technical solution, the second material layer is arranged on the side of the first material layer facing the wall portion, which is beneficial to improve the structural strength of the side of the limiting portion facing the wall portion, so as to facilitate the assembly of the fixing member to the electrode terminal and improve the structural stability of the electrode terminal assembled on the wall portion.

[0097] In some embodiments, the second material layer is located on a side of the first material layer away from the wall portion along a thickness direction of the wall portion; the first material layer located in the base portion and the wall portion are connected to form a connection area, and a projection of the connection area and a projection of the second material layer do not overlap in a same plane perpendicular to the thickness direction of the wall portion.

[0098] In the above technical solution, by setting the second material layer on the side of the first material layer away from the wall portion, and setting the connection area formed by the first material layer located in the base portion and the wall portion to have a projection in the thickness direction of the wall portion that does not overlap with the projection of the second material layer, the battery monomer with this structure can on the one hand improve the contact area between the first material layer located in the base portion and the wall portion, which is conducive to improving the connection stability and reliability between the base portion and the wall portion of the fixing member, and on the other hand can reduce the covering and interference of the second material layer on the connection position between the first material layer located in the base portion and the wall portion, which is conducive to reducing the connection difficulty between the first material layer located in the base portion and the wall portion.

[0099] In some embodiments, the first material layer and the second material layer are stacked, and the thickness of the first material layer is greater than the thickness of the second material layer along a stacking direction of the first material layer and the second material layer.

[0100] 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 portion used for mutual connection with the wall portion is improved, thereby improving the connection stability and firmness between the fixing member and the wall portion.

[0101] In some embodiments, the melting point of the first material layer is greater than or equal to 500℃ and less than or equal to 1000℃; the melting point of the second material layer is greater than or equal to 1050℃ and less than or equal to 3500℃; and the melting point of the wall portion is greater than or equal to 500℃ and less than or equal to 1000℃.

[0102] In the above technical solution, by setting the melting point of the first material layer to be similar or the same as the melting point of the wall portion, the assembly connection of the first material layer and the wall portion is facilitated, and the melting point of the second material layer is relatively high, which has a good high-temperature resistance effect and is not easy to be deformed by heat.

[0103] In some embodiments, the hardness of the first material layer is greater than or equal to 30kgf / mm 2 and less than or equal to 170kgf / mm 2 ; and 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 .

[0104] In the technical solution, the hardness of the first material layer is set to 30kgf / mm 2 to 170kgf / mm 2 , so that the first material layer has good deformation resistance, and the hardness of the second material layer is set to 100kgf / mm 2 to 500kgf / mm 2 , so that the second material layer has better deformation resistance relative to the first material layer, and the overall deformation resistance of the structure formed by the cooperation of 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 portion away from the electrode assembly.

[0105] In some embodiments, the first material layer located in the base portion is welded to the wall portion.

[0106] In the technical solution, the first material layer in the wall portion and the base portion is connected by welding, so as to improve the connection strength between the wall portion and the base portion, and reduce the connection difficulty between the first material layer in the wall portion and the base portion.

[0107] In some embodiments, the material of the first material layer is the same as that of the wall portion.

[0108] In the technical solution, the material of the first material layer of the fixing member is set to be the same as that of the wall portion, so as to realize the same material welding structure of the base portion and the wall portion, thereby reducing the welding difficulty between the first material layer in the base portion and the wall portion, and reducing the welding defects and other phenomena between the base portion and the wall portion, and improving the welding quality between the wall portion and the base portion of the fixing member.

[0109] In some embodiments, the first material layer and the second material layer are connected in complex.

[0110] In the technical solution, the first material layer and the second material layer of the fixing member are set to be connected in complex, which can improve the connection stability and firmness between the first material layer and the second material layer of the fixing member, and reduce the forming difficulty of the fixing member, thereby improving the production efficiency of the fixing member.

[0111] In some embodiments, the base metal of the first material layer is the same as that of the second material layer.

[0112] In the technical solution, the base metal of the first material layer is set to be the same as that of the second material layer, so that the first material layer and the second material layer have the same main components, thereby reducing the connection difficulty between the first material layer and the second material layer, and reducing the forming difficulty of the fixing member.

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

[0114] In some embodiments, the material of the first material layer comprises steel or stainless steel, and the material of the second material layer comprises titanium or titanium alloy.

[0115] In some embodiments, the material of the second material layer comprises ceramic, polymer plastic or carbon fiber reinforced composite material.

[0116] In some embodiments, the shell comprises a housing and an end cover; an accommodation cavity with an opening is formed in the interior of the housing, and the electrode assembly is accommodated in the accommodation cavity; the end cover closes the opening; wherein the wall portion is the end cover.

[0117] In the above technical solution, by setting the wall portion of the shell as the end cover used for closing the opening of the housing, the battery monomer with this structure facilitates the assembly of the electrode terminal to the wall portion through the fixing member, is conducive to reducing the assembly difficulty of the electrode terminal to the wall portion, and facilitates the electrical connection between the electrode terminal and the electrode assembly, which is conducive to reducing the assembly difficulty between the electrode terminal and the electrode assembly, thereby effectively reducing the assembly difficulty of the battery monomer, and improving the production efficiency of the battery monomer.

[0118] In some embodiments, the shell comprises a housing and an end cover; the housing comprises an integrally formed side wall and the wall portion, the side wall is arranged around the wall portion, one end of the side wall is connected to the wall portion in the thickness direction of the wall portion, and the other end of the side wall is enclosed to form an opening; the side wall and the wall portion jointly define an accommodation cavity, and the electrode assembly is accommodated in the accommodation cavity; and the end cover closes the opening.

[0119] In the above technical solution, by setting the wall portion of the shell as one wall of the housing opposite to the end cover in the thickness direction of the wall portion, the battery monomer with this structure can make the wall portion provided 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 relieving 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, reducing the risk of connection failure between the end cover and the housing, and further facilitating the reduction of the risk of liquid leakage of the battery monomer in the use process.

[0120] In a second aspect, the embodiments of the present application also provide a battery device comprising the battery monomer described above.

[0121] In a third aspect, the embodiments of the present application also provide a power utilization device comprising the battery monomer described above, and the battery monomer is used to provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0122] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0123] Fig. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0124] Fig. 2 is a structural exploded view of a battery device provided by some embodiments of the present application;

[0125] Fig. 3 is a structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0126] Fig. 4 is a structural exploded view of a battery cell provided by some embodiments of the present application;

[0127] Fig. 5 is a partial sectional view of a battery cell provided by some embodiments of the present application, perpendicular to the length direction thereof;

[0128] Fig. 6 is a partial enlarged view of A in the battery cell shown in Fig. 5;

[0129] Fig. 7 is a sectional view of a fixing member provided by some embodiments of the present application;

[0130] Fig. 8 is a partial enlarged view of B in the fixing member shown in Fig. 7;

[0131] Fig. 9 is a sectional view of a fixing member provided by some other embodiments of the present application;

[0132] Fig. 10 is a partial enlarged view of C in the fixing member shown in Fig. 9;

[0133] Fig. 11 is a sectional view of a fixing member provided by some other embodiments of the present application;

[0134] Fig. 12 is a sectional view of a fixing member provided by some other embodiments of the present application;

[0135] Fig. 13 is an assembly schematic diagram of a fixing member and an electrode terminal provided by some embodiments of the present application;

[0136] Fig. 14 is a structural schematic diagram of an electrode terminal provided by some embodiments of the present application;

[0137] Fig. 15 is a front view of an electrode terminal in the thickness direction of a wall portion provided by some embodiments of the present application;

[0138] Fig. 16 is a sectional view of an electrode terminal provided by some embodiments of the present application;

[0139] FIG. 17 is a partial cross-sectional view of a battery cell according to some embodiments of the present application, taken perpendicular to the thickness direction of the battery cell;

[0140] FIG. 18 is a partial enlarged view of D of the battery cell shown in FIG. 17;

[0141] FIG. 19 is a structural schematic view of a first insulating member according to some embodiments of the present application;

[0142] FIG. 20 is a structural schematic view of a fixing member according to some embodiments of the present application;

[0143] FIG. 21 is a front view of the fixing member according to some embodiments of the present application, taken in the thickness direction of the wall portion;

[0144] FIG. 22 is a partial cross-sectional view of a battery cell according to some other embodiments of the present application, taken perpendicular to the length direction of the battery cell;

[0145] FIG. 23 is a partial enlarged view of E of the battery cell shown in FIG. 22;

[0146] FIG. 24 is a cross-sectional view of a fixing member according to yet some other embodiments of the present application.

[0147] FIG. 24 is a cross-sectional view of a fixing member according to yet some other embodiments of the present application. DETAILED DESCRIPTION

[0148] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0149] Unless otherwise defined, all technical and scientific terms used in the application have the same meanings as those commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing the particular embodiments only and is not intended to be limiting of the application; the terms "include" and "comprising" and variations thereof as used in enlisting the specification and claims of the application are intended to cover the same objects as the terms "consist of and "consisting of" respectively. The terms "first", "second", and the like in the description of the application do not necessarily indicate that two or more objects so described are in a required sequence.

[0150] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0151] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0152] In the application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. In addition, the character " / " in the application generally represents that the front and rear associated objects have an "or" relationship.

[0153] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the application.

[0154] "Multiple" appearing in the application means two or more (including two).

[0155] In the embodiments of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0156] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0157] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can function to prevent short circuiting of the positive and negative electrodes while allowing the active ions to pass through.

[0158] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0159] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0160] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a high molecular material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high molecular material base material (e.g., a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0161] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone or in combination of two or more. Examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (e.g., LiFePO4 (which can also be referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3O2(also can be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2(also can be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2(also can be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2(also can be referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2(also can be referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and modified compounds thereof.

[0162] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. When the foam metal is used as the positive electrode, the surface of the foam metal can not be provided with a positive electrode active material, or of course can be provided with a positive electrode active material. As an example, the foam metal can also be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0163] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0164] As an example, the negative electrode current collector can employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, silver surface treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, nickel, or titanium, or the like can be employed. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. The composite current collector can include a high polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0165] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0166] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two surfaces of the negative current collector.

[0167] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative active material can also be used. These negative active materials can be used alone or in combination of two or more.

[0168] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0169] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0170] In some embodiments, the separator is a separator film. The separator film can be of various types, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0171] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0172] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive and negative electrodes.

[0173] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0174] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluorophosphoric oxalate, and lithium tetrafluorophosphoric oxalate.

[0175] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from ether solvents. The ether solvents can 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, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0176] In some embodiments, the gel-state electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0177] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0178] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, a cellulose, or the like.

[0179] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0180] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0181] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0182] In some embodiments, the electrode assembly is in a stacked structure.

[0183] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0184] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked, and one positive electrode sheet can be interposed between adjacent folded segments.

[0185] As an example, the positive electrode sheet and the negative electrode sheet are each folded to form a plurality of folded segments which are stacked.

[0186] As an example, a plurality of separators can be provided, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0187] As an example, the separators can be provided continuously, and provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0188] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prismatic shape, etc.

[0189] In some embodiments, the electrode assembly can be provided with tabs, which can conduct current out of the electrode assembly. The tabs can include positive tabs and negative tabs.

[0190] In some embodiments, the battery cell can include a housing. The housing can be used to enclose components such as the electrode assembly and the electrolyte. The housing can be a steel case, an aluminum case, a plastic case (such as polypropylene), a composite metal case (such as a copper-aluminum composite case), or an aluminum-plastic film, etc.

[0191] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell can include, but is not limited to, a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0192] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0193] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0194] In some embodiments, the battery apparatus can be a battery pack, which includes a box and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box.

[0195] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0196] As an example, the battery cell assembly can also be housed in the box by directly fixing a plurality of battery cells to the box.

[0197] As an example, the box can include a first box body and a second box body. The first box body and the second box body are fastened so that an enclosed space is formed inside the box to accommodate the battery cell assembly. The enclosed here means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0198] As an example, the box can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are connected with the frame respectively, so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0199] As an example, the box can be part of the chassis structure of the vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0200] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0201] The battery device has the outstanding advantages of high energy density, small environmental pollution, large power density, long service life, wide adaptation range, small self-discharge coefficient, etc., and is an important part of the development of new energy today. The development of battery technology needs to consider many design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters, in addition, the safety of the battery device also needs to be considered.

[0202] For a general battery monomer, the shell of the battery monomer usually includes a shell and an end cover, the end cover covers the opening of the shell, wherein the end cover is provided with a terminal hole, in order to facilitate the assembly of the battery monomer, the electrode terminal is usually inserted into the terminal hole of the end cover, and the compression ring is connected on the end cover, the compression ring is arranged around the electrode terminal, by setting part of the electrode terminal between the compression ring and the end cover, the end cover and the compression ring can cooperate to compress the electrode terminal on the end cover, so as to realize the assembly of the electrode terminal on the end cover, and in order to reduce the risk of short circuit between the electrode terminal and the end cover, an insulating ring is usually arranged between the compression ring and the electrode terminal, so as to realize the insulation isolation between the electrode terminal and the compression ring, however, in order to improve the connection reliability between the compression ring and the end cover and to save the space occupied by the compression ring and the electrode terminal in the thickness direction of the end cover, the space for assembling the insulating ring between the compression ring and the electrode terminal is small, which leads to insufficient creepage distance between the compression ring and the electrode terminal, thereby causing the electrode terminal and the compression ring to be easily short-circuited in the use process of the battery monomer, which causes the risk of short circuit of the battery monomer in the use process, and is not conducive to improving the use reliability of the battery monomer.

[0203] Based on the above consideration, in order to solve the problem of low use reliability of the battery monomer, the embodiment of the present application provides a battery monomer, the battery monomer includes a shell, an electrode assembly, an electrode terminal, a fixing piece and a first insulating piece. The shell has a wall part. The electrode assembly is contained in the shell. The electrode terminal is arranged on the wall part, and the electrode terminal is electrically connected with the electrode assembly. The fixing piece is arranged on the periphery of the electrode terminal, and the fixing piece includes a base part and a limiting part, the base part is connected to the wall part, and 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 movement of the electrode terminal in the thickness direction of the wall part away from the electrode assembly. At least part of the first insulating piece is arranged between the electrode terminal and the limiting part. The thickness of the limiting part is less than the thickness of the base part.

[0204] In the battery cell with the structure, the wall of the shell is connected with a fixing member, the fixing member is provided with a base and a limiting portion, the base is connected with the wall, the limiting portion is connected with the base and extends towards the electrode terminal, at least part of the first insulating member is arranged between the limiting portion and the electrode terminal, the limiting portion and the wall can clamp the electrode terminal to limit the electrode terminal from moving away from the electrode assembly along the thickness direction of the wall, so that the electrode terminal is assembled and fixed on the wall, and the limiting portion and the electrode terminal are insulated by the first insulating member, wherein the thickness of the limiting portion for limiting the electrode terminal is set to be smaller than the thickness of the base of the fixing member for connecting with the wall, so that the space between the limiting portion and the electrode terminal for accommodating the first insulating member is enlarged while meeting the requirements of the connection quality and strength of the base of the fixing member with the wall, the thickness of the part of the first insulating member arranged between the limiting portion and the electrode terminal can be increased to increase the creepage distance between the limiting portion and the electrode terminal, so that the short circuit between the limiting portion and the electrode terminal in use can be effectively alleviated, the risk of short circuit of the battery cell in use is reduced, and the use reliability of the battery cell is improved.

[0205] The battery cell disclosed in the embodiments of the application can be used in an electric device such as a vehicle, a ship or an aircraft, but is not limited thereto. The power supply system of the electric device can be composed of the battery cell and the battery device disclosed in the application, so that the short circuit of the battery cell in use can be alleviated, and the use reliability of the battery cell is improved.

[0206] The embodiments of the application provide an electric device using the battery cell or the battery device as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0207] The following embodiments are described with reference to a vehicle as an example of an electric device of an embodiment of the application for convenience of description.

[0208] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged 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 can be used to supply power for the vehicle 1000, for example, the battery device 100 can be used as an operating power source or a usage power source of the vehicle 1000, etc. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 is used to control the battery device 100 to supply power for the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0209] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source or a usage power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0210] Please refer to FIG. 2 and FIG. 3, FIG. 2 is an exploded structural diagram of the battery device 100 provided by some embodiments of the present application, and FIG. 3 is a structural schematic diagram of a battery cell 20 provided by some embodiments of the present application. The battery device 100 includes a box body 10 and the battery cell 20, and the battery cell 20 is used to be accommodated in the box body 10.

[0211] The box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 are mutually covered, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-shaped structure, which is covered on the open side of the second box body 12 to jointly define the assembly space with the second box body 12; 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 is covered on the open side of the second box body 12.

[0212] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can have various shapes, such as a cylinder, a cuboid, or a square, etc. Exemplarily, in FIG. 2, the shape of the box body 10 is a cuboid.

[0213] In the battery device 100, the battery cell 20 arranged in the case 10 can be one or multiple. When the battery cell 20 arranged in the case 10 is multiple, the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 20 is accommodated in the case 10. Of course, the battery device 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is accommodated in the case 10.

[0214] In some embodiments, the battery device 100 can further include other structures. For example, the battery device 100 can further include a busbar component for connecting the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0215] Each battery cell 20 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can have a cuboid, a cylinder, a prism, or other shapes. For example, in FIG. 3, the battery cell 20 has a cuboid structure.

[0216] According to some embodiments of the present application, referring to FIG. 3, and further referring to FIG. 4, FIG. 5, FIG. 6, FIG. 7, and FIG. 8, FIG. 4 is an exploded view of the structure of the battery cell 20 according to some embodiments of the present application, FIG. 5 is a partial cross-sectional view of the battery cell 20 perpendicular to the length direction thereof according to some embodiments of the present application, FIG. 6 is a partial enlarged view of A of the battery cell 20 shown in FIG. 5, FIG. 7 is a cross-sectional view of the fixing member 23 according to some embodiments of the present application, and FIG. 8 is a partial enlarged view of B of the fixing member 23 shown in FIG. 7. The present application provides a battery cell 20, which includes 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 accommodated in the housing 21. The electrode terminal 24 is arranged on the wall portion 211, and the electrode terminal 24 is electrically connected to the electrode assembly 22. The fixing member 23 is arranged on the circumferential side of the electrode terminal 24, and the fixing member 23 includes a base portion 231 and a limiting portion 232. The base portion 231 is connected to the wall portion 211, and the limiting portion 232 is connected to the base portion 231 and extends in a direction close to the electrode terminal 24. The limiting portion 232 is configured 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. At least part of the first insulating member 25 is arranged between the electrode terminal 24 and the limiting portion 232. The thickness of the limiting portion 232 is smaller than the thickness of the base portion 231.

[0217] The shell 21 can also be used to contain electrolyte, such as electrolyte solution. The shell 21 can be of various structures. The shell 21 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0218] In some embodiments, the shell 21 can include a shell body 212 and an end cover 213. The shell body 212 has an internal space formed therein, and the internal space has an opening 2121, i.e., the shell body 212 is a hollow structure with one end open. The end cover 213 is attached to the opening 2121 of the shell body 212 and forms a sealed connection, so as to form a sealed space for containing the electrode assembly 22 and the electrolyte.

[0219] Optionally, the wall portion 211 for connecting the fixing member 23 and the electrode terminal 24 can be the end cover 213, or can be one of the walls of the shell body 212. In the examples of FIGS. 3 and 4, the wall portion 211 is the end cover 213 of the shell 21, so that the thickness direction X of the wall portion is the height direction of the battery cell 20. Of course, in other embodiments, the wall portion 211 can also be a bottom wall of the shell body 212 opposite the end cover 213 in the thickness direction X of the wall portion, or a side wall adjacent to the end cover 213 and abutting against each other.

[0220] In assembling the battery cell 20, the electrode assembly 22 can be first placed in the shell body 212, and the electrolyte is then filled into the shell body 212. The end cover 213 is then attached to the opening 2121 of the shell body 212 to close the opening 2121 of the shell body 212.

[0221] The shell body 212 can be of various shapes, such as a cylinder, a cuboid, etc. The shape of the shell body 212 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is of a cylindrical structure, the shell body 212 can be of a cylindrical structure; if the electrode assembly 22 is of a cuboid structure, the shell body 212 can be of a cuboid structure. Of course, the end cover 213 can also be of various structures, such as a plate structure or a hollow structure with one end open, etc. In the examples of FIGS. 3 and 4, the shell body 212 is of a cuboid structure, and correspondingly, the end cover 213 is of a rectangular plate structure.

[0222] It can be understood that the shell 21 is not limited to the above structure, and the shell 21 can also be of other structures, such as the shell 21 including a shell body 212 and two end covers 213. The shell body 212 is a hollow structure with two opposite openings 2121. One end cover 213 is attached to one of the openings 2121 of the shell body 212 and forms a sealed connection, so as to form a sealed space for containing the electrode assembly 22 and the electrolyte.

[0223] The electrode assembly 22 is a component in which an electrochemical reaction occurs in the battery cell 20, and the structure of the electrode assembly 22 can be various, for example, the electrode assembly 22 can be a jelly-roll structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or can be a stacked structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet.

[0224] For example, the separator is a separator film, and the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0225] The electrode assembly 22 is a component in which an electrochemical reaction occurs in the battery cell 20, and the structure of the electrode assembly 22 can be various, for example, the electrode assembly 22 can be a jelly-roll structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or can be a stacked structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet.

[0226] Optionally, the electrode assembly 22 accommodated in the shell 21 can be one or multiple. For example, in FIG. 4, the 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 assembly 22 accommodated in the shell 21 can be one, three, four, five, six, seven, or eight, etc.

[0227] The electrode terminal 24 serves to output or input the electric energy of the battery cell 20, one end of the electrode terminal 24 is used to be connected with the tab 221 of the electrode assembly 22, and the other end is used to be connected with a bus component, so as to realize the input or output of the electric energy of the battery cell 20.

[0228] For example, the material of the electrode terminal 24 can be various, for example, the material of the electrode terminal 24 can be copper, iron, aluminum, steel, aluminum alloy, etc. Of course, in some embodiments, the electrode terminal 24 can also be a composite material, that is, the electrode terminal 24 is connected by composite connection of two different materials, such as hot pressing or cold pressing, etc.

[0229] The wall portion 211 is provided with a terminal hole 2111 penetrating through the wall portion 211 along the thickness direction X of the wall portion, and 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 inside the shell 21 and also connected to the busbar component outside the shell 21, so as to realize the input or output of the electric energy of the battery monomer 20.

[0230] Optionally, the electrode terminal 24 can be directly connected to the tab 221 of the electrode assembly 22, such as welding or abutting, etc., and can also be indirectly connected to the tab 221 of the electrode assembly 22 through other components. Similarly, the connection structure of the electrode terminal 24 and the busbar component can also be various, such as welding, abutting or clamping, etc.

[0231] In some embodiments, referring to FIG. 4, the battery monomer 20 can also include a current collecting member 26, which is arranged in the shell 21, and the current collecting member 26 connects the electrode terminal 24 and the tab 221 of the electrode assembly 22, so as to realize the electrical connection between the electrode assembly 22 and the electrode terminal 24.

[0232] The current collecting member 26 protrudes in the thickness direction X of the wall portion to form a protruding portion 261 facing one side of the wall portion 211, the protruding portion 261 is inserted into the terminal hole 2111 along the thickness direction X of the wall portion, and the protruding portion 261 is used to connect the electrode terminal 24, so as to electrically connect the current collecting member 26 and the electrode terminal 24. The current collecting member 26 with this structure is beneficial to reduce the connection difficulty between the current collecting member 26 and the electrode terminal 24.

[0233] For example, the protruding portion 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 can also be in abutting structure with the electrode terminal 24, and the current collecting member 26 can also be in abutting structure with the tab 221 of the electrode assembly 22.

[0234] In the embodiments of the present application, the fixing member 23 plays a role of fixing the electrode terminal 24 on the wall portion 211, and the fixing member 23 is connected to the wall portion 211, i.e. the fixing member 23 is fastened to the wall portion 211. The fixing member 23 and the wall portion 211 can be an integral structure, or can be a separate structure. For example, in FIGS. 5 and 6, the fixing member 23 and the wall portion 211 are a separate structure, 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.

[0235] The fixing member 23 is arranged on the peripheral side of the electrode terminal 24, that is, the fixing member 23 is arranged on the outer peripheral side of the electrode terminal 24, and the fixing member 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-shaped structure extending along the circumference of the electrode terminal 24.

[0236] The base 231 of the fixing member 23 is a part of the fixing member 23 for connecting with the wall 211, and the limiting part 232 of the fixing part is a part of the fixing member 23 for limiting the movement of the electrode terminal 24 in the thickness direction X of the wall away from the electrode assembly 22, and the structure of the limiting part 232 of the fixing member 23 for limiting the movement of the electrode terminal 24 in the thickness direction X of the wall away from the electrode assembly 22 can be various, for example, in FIG. 6, part of the electrode terminal 24 is located between the limiting part 232 and the wall 211 in the thickness direction X of the wall, so that the limiting part 232 and the wall 211 are structures for clamping the electrode terminal 24 to limit the movement of the electrode terminal 24 in the thickness direction X of the wall away from the electrode assembly 22, wherein part of the first insulating member 25 abuts between the limiting part 232 and the electrode terminal 24 in the thickness direction X of the wall, of course, in other embodiments, the limiting part 232 and the electrode terminal 24 can also be a structure in which the projections in the thickness direction X of the wall do not overlap, that is, the limiting part 232 is a structure for indirectly pressing the electrode terminal 24 on the wall 211 by the first insulating member 25.

[0237] The limiting part 232 is connected to the base 231 and extends in the direction close to the electrode terminal 24, that is, the limiting part 232 is a structure connected to the inner peripheral side of the base 231 and extending in a direction perpendicular to the thickness direction X of the wall.

[0238] The thickness of the limiting part 232 is smaller than the thickness of the base 231, that is, the wall thickness of the limiting part 232 is smaller than the wall thickness of the base 231, for example, in FIGS. 6, 7 and 8, the thickness direction of the limiting part 232 and the thickness direction of the base 231 are both the thickness direction X of the wall, and correspondingly, the thickness of the limiting part 232 is D1, and the thickness of the base 231 is D2, that is, D1 is smaller than D2.

[0239] In which, the first insulating member 25 can also be arranged between the fixing member 23 and the electrode terminal 24, and the first insulating member 25 is at least partially arranged between the electrode terminal 24 and the limiting part 232, so that the first insulating member 25 can play a role of insulating and isolating the limiting part 232 of the fixing member 23 and the electrode terminal 24, to realize the insulation and isolation between the electrode terminal 24 and the limiting part 232 of the fixing member 23.

[0240] For example, the material of the first insulating member 25 can be various, such as rubber, silicone or plastic, etc.

[0241] In the embodiment of the present application, the limiting portion 232 is configured to cooperate with the wall portion 211 to limit the electrode terminal 24 from moving along the thickness direction X of the wall portion, wherein the electrode terminal 24 comprises a body portion 241 and a fitting portion 242 protruding on the outer circumferential surface of the body portion 241, the fitting portion 242 extends to between the limiting portion 232 and the wall portion 211, so that the part of the fitting 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 to clamp the fitting portion 242 of the electrode terminal 24 in the thickness direction X of the wall portion, so as to fasten and limit the electrode terminal 24 on the wall portion 211.

[0242] It should be noted that the limiting portion 232 and the fitting portion 242 can be in direct contact or indirect contact structure, similarly, the wall portion 211 and the fitting portion 242 can also be in direct contact or indirect contact structure, that is, the limiting portion 232 and the wall portion 211 can be a structure of directly clamping and limiting the fitting portion 242, or a structure of indirectly clamping and limiting the fitting portion 242 through other components. Exemplarily, referring to FIGS. 5 and 6, the battery monomer 20 is provided with a first insulating piece 25 and a second insulating piece 27, part of the first insulating piece 25 is arranged between the limiting portion 232 of the fixing piece 23 and the electrode terminal 24 to insulate and isolate the fixing piece 23 and the electrode terminal 24, and the second insulating piece 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 piece 23 is in contact with the fitting portion 242 through the first insulating piece 25, and the wall portion 211 is in contact with the fitting portion 242 through the second insulating piece 27, so that the limiting portion 232 and the wall portion 211 are in a structure of indirectly clamping and limiting the fitting portion 242 through the first insulating piece 25 and the second insulating piece 27, thereby achieving the insulation installation of the electrode terminal 24 on the wall portion 211, that is, no electrical connection is formed between the electrode terminal 24 and the wall portion 211.

[0243] Referring to FIGS. 5 and 6, along the thickness direction X of the wall portion, part of the second insulating piece 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, and the second insulating piece 27 is arranged in a structure surrounding the terminal hole 2111, so that the second insulating piece 27 is also configured to seal the gap between the electrode terminal 24 and the wall portion 211.

[0244] Exemplarily, the material of the second insulating piece 27 can be rubber, silicone or plastic, etc.

[0245] In some embodiments, the battery cell 20 can further include a third insulating member 28, which is arranged on a side of the wall portion 211 facing the electrode assembly 22 along the thickness direction X of the wall portion, and a portion of the third insulating member 28 is located between the current collecting member 26 and the wall portion 211 to insulate and separate the current collecting member 26 and the wall portion 211.

[0246] Exemplarily, the third insulating member 28 can be made of rubber, silicone or plastic.

[0247] Optionally, referring to FIGS. 5 and 6, the second insulating member 27 has a first extending portion 271 extending into the terminal hole 2111 along the thickness direction X of the wall portion, and the third insulating member 28 has a second extending portion 281 extending into the terminal hole 2111 along the thickness direction X of the wall portion, the second extending portion 281 and the first extending portion 271 abut each other along the thickness direction X of the wall portion, and the second extending portion 281 and the first extending portion 271 are both annular structures extending along the circumferential direction of the hole wall surface of the terminal hole 2111, and are configured to insulate and separate the electrode terminal 24 and the hole wall surface of the terminal hole 2111 and the protruding portion 261 of the current collecting member 26 and the hole wall surface of the terminal hole 2111, so that after the protruding portion 261 of the current collecting member 26 is connected to the electrode terminal 24, the first extending portion 271 is located between the protruding portion 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 extending portion 281 is located between the protruding portion 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.

[0248] In FIGS. 3 and 4, the battery cell 20 includes two electrode terminals 24 and two current collecting members 26, the two electrode terminals 24 are arranged on the wall portion 211 with a spacing, and the two current collecting members 26 are arranged in the housing 21 with a spacing, and correspondingly, each electrode assembly 22 has two tabs 221 arranged with a spacing and having opposite polarities, and the two electrode terminals 24 are respectively electrically connected to the two tabs 221 of the electrode assembly 22 through the two current collecting members 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, and correspondingly, the two tabs 221 are respectively the positive tab and the negative tab of the electrode assembly 22.

[0249] The battery monomer 20 comprises two fixing members 23, two first insulation members 25 and two second insulation members 27, the fixing members 23, the first insulation members 25 and the second insulation members 27 are arranged in one-to-one correspondence with the electrode terminals 24, each electrode terminal 24 is assembled on the wall portion 211 by one fixing member 23, one first insulation member 25 is arranged between each electrode terminal 24 and the fixing member 23, and one second insulation member 27 is arranged between each electrode terminal 24 and the wall portion 211.

[0250] Optionally, the two electrode terminals 24 are insulated and mounted on the wall portion 211, each electrode terminal 24 is electrically connected with one tab 221 of the electrode assembly 22 to output the positive and negative poles of the battery monomer 20. Of course, in other embodiments, the two electrode terminals 24 can also be mounted on different walls of the shell 21.

[0251] In some embodiments, referring to FIGS. 3 and 4, the battery monomer 20 can further comprise a pressure relief mechanism 29 arranged on the shell 21, the pressure relief mechanism 29 is used to release the pressure inside the battery monomer 20 when the internal pressure or temperature of the battery monomer 20 reaches a predetermined value.

[0252] The pressure relief mechanism 29 can be arranged on the end cover 213 of the shell 21 or on the shell body 212 of the shell 21. For example, in FIG. 4, the pressure relief mechanism 29 is arranged on the end cover 213 of the shell 21.

[0253] Optionally, the pressure relief mechanism 29 and the shell 21 can be an integrally formed structure or a split structure. If the pressure relief mechanism 29 and the shell 21 are a split structure, the pressure relief mechanism 29 can be connected to the shell 21 by welding or the like. Correspondingly, the pressure relief mechanism 29 can be a pressure relief component such as an explosion-proof valve, an explosion-proof sheet, an air valve, a pressure relief valve or a safety valve. If the pressure relief mechanism 29 and the shell 21 are an integrally formed structure, the pressure relief mechanism 29 is a region with a weak structure formed on the shell 21, for example, a region provided with a notch groove on the shell 21.

[0254] In the embodiment, the wall portion 211 of the shell 21 is connected with the fixing member 23, the fixing member 23 is provided with a base portion 231 and a limiting portion 232, the base portion 231 is connected with the wall portion 211, the limiting portion 232 is connected with the base portion 231 and extends towards the electrode terminal 24, and at least part of the first insulating member 25 is arranged 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 movement of the electrode terminal 24 along the thickness direction X of the wall portion away from the electrode assembly 22, 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. By setting the thickness of the limiting portion 232 of the fixing member 23 for limiting the assembly of the electrode terminal 24 to be less than the thickness of the base portion 231 of the fixing member 23 for connecting with the wall portion 211, the space for accommodating the first insulating member 25 between the limiting portion 232 and the electrode terminal 24 can be enlarged while meeting the requirements of the connection quality and strength of the base portion 231 of the fixing member 23 with the wall portion 211, so that the thickness of the part of the first insulating member 25 arranged between the limiting portion 232 and the electrode terminal 24 can be increased to increase the creepage distance between the limiting portion 232 and the electrode terminal 24, thereby effectively alleviating the short circuit phenomenon of the limiting portion 232 and the electrode terminal 24 in use, which is beneficial to reduce the risk of short circuit of the battery monomer 20 in use, thereby improving the use reliability of the battery monomer 20.

[0255] According to some embodiments of the present application, as shown in FIGS. 5 and 6, part of the electrode terminal 24 is located between the limiting portion 232 and the wall portion 211 along the thickness direction X of the wall portion. That is, part of the electrode terminal 24 extends between the limiting portion 232 and the wall portion 211 of the fixing member 23, so that the limiting portion 232 and the wall portion 211 are respectively located on both sides of the part of the electrode terminal 24 along the thickness direction X of the wall portion, thereby making the projection of the limiting portion 232 of the fixing member 23 along the thickness direction X of the wall portion overlap with part of the projection of the electrode terminal 24, and making the projection of the wall portion 211 along the thickness direction X of the wall portion overlap with part of the projection of the electrode terminal 24.

[0256] For example, the electrode terminal 24 includes a body portion 241 and an assembly portion 242 protruding on the outer circumferential surface of the body portion 241, the assembly portion 242 extends between the limiting portion 232 and the wall portion 211 of the fixing member 23, so that part of the assembly portion 242 along the thickness direction X of the wall portion is located between the limiting portion 232 and the wall portion 211 of the fixing member 23, thereby achieving the part of the electrode terminal 24 located between the limiting portion 232 and the wall portion 211.

[0257] In the embodiment, by setting the portion of the electrode terminal 24 between the limiting portion 232 and the wall portion 211 in the thickness direction X of the wall portion, the portion of the limiting 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, so that the effect of the limiting portion 232 and the wall portion 211 cooperating to clamp the electrode assembly 22 can be improved, the effect of the limiting portion 232 limiting the movement of the electrode terminal 24 in the thickness direction X of the wall portion away from the electrode assembly 22 can be improved, and the stability and firmness of the electrode terminal 24 assembled on the wall portion 211 can be improved.

[0258] According to some embodiments of the present application, referring to FIGS. 6, 7 and 8, and further referring to FIGS. 9, 10 and 11, FIG. 9 is a sectional view of the fixing member 23 according to some other embodiments of the present application, FIG. 10 is a partial enlarged view of C of the fixing member 23 shown in FIG. 9, and FIG. 11 is a sectional view of the fixing member 23 according to some other embodiments of the present application. In the thickness direction X of the wall portion, 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 portion 231 facing the wall portion 211. That is, the side of the fixing member 23 facing the wall portion 211 in the thickness direction X of the wall portion is a stepped structure, so that the side of the fixing member 23 facing the wall portion 211 in the thickness direction X of the wall portion is formed with a receiving groove for accommodating the first insulating member 25.

[0259] It should be noted that the structure in which 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 portion 231 facing the wall portion 211 in the thickness direction X of the wall portion can be various, such as the structure in which the limiting portion 232 and the base portion 231 are spaced apart in the thickness direction X of the wall portion, and the limiting portion 232 is farther away from the wall portion 211 than the base portion 231 in the thickness direction X of the wall portion, so as to achieve 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 portion 231 facing the wall portion 211, or the structure in which the side of the fixing member 23 facing the wall portion 211 is partially thinned, so that the thinned region of the fixing member 23 is the limiting portion 232, and the non-thinned region of the fixing member 23 is the base portion 231, so as to achieve 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 portion 231 facing the wall portion 211.

[0260] In the 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 portion 231 facing the wall portion 211, the part of the electrode terminal 24 located between the limiting portion 232 and the wall portion 211 can share part of the space in the thickness direction X of the wall portion with the fixing member 23, thereby effectively saving the space in the thickness direction X of the wall portion that is jointly occupied by the fixing member 23 and the electrode terminal 24, saving the space in the thickness direction X of the wall portion that is occupied by the battery monomer 20, and further facilitating the improvement of the energy density of the battery monomer 20.

[0261] According to some embodiments of the present application, referring to FIGS. 7 and 8 and FIGS. 9 and 10, along the thickness direction X of the wall portion, 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 portion 231 facing away from the wall portion 211. The fixing member 23 further comprises a connecting portion 233 connecting the base portion 231 and the limiting portion 232.

[0262] Wherein, along the thickness direction X of the wall portion, 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 portion 231 facing away from the wall portion 211, that is, the limiting portion 232 is convex on the side of the base portion 231 facing away from the wall portion 211 in the thickness direction X of the wall portion, so that the limiting portion 232 and the base portion 231 have a height difference in the thickness direction X of the wall portion, and the limiting portion 232 is farther away from the wall portion 211 than the base portion 231.

[0263] 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, and the structure of the connecting portion 233 can be various, such as in FIGS. 7 and 8, the connecting portion 233 is a bending structure connected between the base portion 231 and the limiting portion 232, and the limiting portion 232 and the base portion 231 are connected to two ends of the connecting portion 233, and in FIGS. 9 and 10, the connecting portion 233 comprises two segments, which are a bending segment 2331 and a straight segment 2332 connected to each other, the bending segment 2331 is connected to the base portion 231, and the straight segment 2332 is connected to the limiting portion 232, and the straight segment 2332 and the limiting portion 232 are parallel to each other. Correspondingly, the fixing member 23 shown in FIGS. 7 and 8 is a structure in which the connecting portion 233 only comprises the bending segment 2331.

[0264] In the embodiment, the surface of the limiting portion 232 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 portion 231 away from the wall portion 211, so that the limiting portion 232 is a structure protruding from the side of the base portion 231 away from the wall portion 211. By arranging the connecting portion 233 between the base portion 231 and the limiting portion 232, on the one hand, the connection difficulty between the base portion 231 and the limiting portion 232 is reduced, and the connection stability between the base portion 231 and the limiting portion 232 is improved. On the other hand, while achieving the pressing of the electrode terminal 24 by the limiting portion 232 and the connection quality between the base portion 231 and the wall portion 211, the thickness of the base portion 231 in the thickness direction X of the wall portion does not need to be increased, which is conducive to reducing the manufacturing cost of the fixing piece 23 and reducing the weight of the fixing piece 23.

[0265] In some embodiments, please continue to refer to FIGS. 7 and 8 and FIGS. 9 and 10, the limiting portion 232 and the base portion 231 are arranged in the thickness direction X of the wall portion.

[0266] In the embodiment, by arranging the limiting portion 232 and the base portion 231 to be spaced apart from each other in the thickness direction X of the wall portion, the difficulty of assembling part of the electrode terminal 24 between the limiting portion 232 and the wall portion 211 is reduced, and the difficulty of forming the connecting portion 233 connecting the limiting portion 232 and the base portion 231 is reduced.

[0267] According to some embodiments of the present application, please refer to FIGS. 7 and 8 and FIGS. 9 and 10, in a direction perpendicular to the thickness direction X of the wall portion, the base portion 231 extends from the connecting portion 233 to a direction away from the electrode terminal 24, and the limiting portion 232 extends from the connecting portion 233 to a direction close to the electrode terminal 24.

[0268] In the embodiment, the base portion 231 extends from the connecting portion 233 to a direction away from the electrode terminal 24, that is, the base portion 231 is a structure extending from one end connected to the connecting portion 233 to a direction away from the electrode terminal 24 along the radial direction of the electrode terminal 24. The limiting portion 232 extends from the connecting portion 233 to a direction close to the electrode terminal 24, that is, the limiting portion 232 is a structure extending from one end connected to the connecting portion 233 to a direction close to the electrode terminal 24 along the radial direction of the electrode terminal 24. Therefore, the base portion 231 and the limiting portion 232 are parallel to each other, and the base portion 231 and the limiting portion 232 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 a direction in which the center of the electrode terminal 24 points to the outer edge of the electrode terminal 24 or the outer edge of the electrode terminal 24 points to the center of the electrode terminal 24 in a plane perpendicular to the thickness direction X of the wall portion.

[0269] In the embodiment, by setting the limiting portion 232 to extend from one side of the connecting portion 233 to the direction close to the electrode terminal 24, and setting the base portion 231 to extend from the other side of the connecting portion 233 to the direction away from the electrode terminal 24, the cross section of the fixing member 23 is in a "Z" shape structure, so on one hand, the structure of the fixing member 23 can be optimized, which is beneficial to reduce the difficulty of connecting the fixing member 23 to the wall portion 211, on the other hand, the interference between the base portion 231 and the electrode terminal 24 can be reduced, and the phenomenon that the base portion 231 occupies the space between the wall portion 211 and the limiting portion 232 can be reduced, so as to facilitate the limiting portion 232 and the wall portion 211 to clamp and assemble the electrode terminal 24, and it is beneficial to optimize the space occupied by the fixing member 23 and the electrode terminal 24 in the thickness direction X of the wall portion.

[0270] In some embodiments, referring to FIG. 6, 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. That is, the connecting portion 233 and the electrode terminal 24 are arranged in a spaced structure in the radial direction of the electrode terminal 24, so that the connecting portion 233 and the electrode terminal 24 do not cover each other in the thickness direction X of the wall portion.

[0271] In the embodiment, by setting the connecting portion 233 and the electrode terminal 24 to be in a structure that the projections in the thickness direction X of the wall portion do not overlap, the interference 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 reduce the risk of short circuit between the connecting portion 233 and the electrode terminal 24.

[0272] According to some embodiments of the present application, referring to FIGS. 9 and 10, the connecting portion 233 can include a curved segment 2331 and a straight segment 2332, the curved segment 2331 is connected to the base portion 231, and the straight segment 2332 is connected to the curved segment 2331 and extends from the curved segment 2331 to the direction close to the electrode terminal 24 in the direction perpendicular to the thickness direction X of the wall portion. The surface of the straight segment 2332 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 portion 231 away from the wall portion 211, and the limiting portion 232 is connected to the end of the straight segment 2332 facing the electrode terminal 24 in the direction perpendicular to the thickness direction X of the wall portion.

[0273] Among them, the straight segment 2332 is a structure connected to the end of the curved segment 2331 away from the base portion 231 and extending to the direction close to the electrode terminal 24 in the radial direction of the electrode terminal 24, so that the straight segment 2332 and the base portion 231 are in a parallel structure.

[0274] The flat section 2332 is further away from the wall portion 211 in the thickness direction X of the wall portion than the surface of the base portion 231 facing the wall portion 211, that is, the flat section 2332 of the connecting portion 233 is a structure protruding from the side of the base portion 231 facing the wall portion 211 in the thickness direction X of the wall portion, and in an example, the flat section 2332 is spaced apart from the base portion 231 in the thickness direction X of the wall portion, and the flat section 2332 is further away from the wall portion 211 than the base portion 231.

[0275] The limiting portion 232 is connected to the end of the flat 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 one end of the flat section 2332 facing the electrode terminal 24 in the radial direction of the electrode terminal 24, and in an example, the flat 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 flat section 2332.

[0276] In this embodiment, the connecting portion 233 is provided with the curved section 2331 and the flat section 2332 connected to each other, the curved section 2331 is connected to the base portion 231, the flat section 2332 extends from the curved section 2331 in a direction close to 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 flat section 2332 facing the electrode terminal 24, so that the surface of the limiting portion 232 facing the wall portion 211 and the surface of the flat section 2332 facing the wall portion 211 can be further away from the wall portion 211 than the surface of the base portion 231 facing the wall portion 211. The fixing member 23 with this structure can facilitate the connection of the connecting portion 233 and the limiting portion 232 on the one hand, which is conducive to reducing the connection difficulty between the connecting portion 233 and the limiting portion 232, and on the other hand, can improve the connection strength between the limiting portion 232 and the connecting portion 233, so that the force of the limiting portion 232 pressing the electrode terminal 24 is a structure acting on the flat section 2332 of the connecting portion 233, which is conducive to improving the overall structural strength of the fixing member 23, and can improve the effect of the limiting portion 232 of the fixing member 23 pressing the electrode terminal 24.

[0277] In some embodiments, referring to FIG. 10, along the thickness direction X of the wall portion, 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 flat section 2332 facing the wall portion 211, so as to form a thinned groove 234 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 thinned groove 234.

[0278] The thinning groove 234 is a structure in which the surface of the wall portion 211 facing the limiting portion 232 in the thickness direction X of the wall portion and the end surface of the electrode terminal 24 facing the flat section 2332 in the radial direction of the electrode terminal 24 are collectively defined, and the portion of the first insulating member 25 is accommodated in the thinning groove 234, that is, the portion of the first insulating member 25 between the limiting portion 232 and the electrode terminal 24 in the thickness direction X of the wall portion is inserted into the thinning groove 234.

[0279] Exemplarily, in FIG. 10, along the thickness direction X of the wall portion, the surface of the limiting portion 232 facing the wall portion 211 and the surface of the flat section 2332 facing the wall portion 211 are flush.

[0280] In the present 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 flat section 2332 facing the wall portion 211, the side of the limiting portion 232 facing the wall portion 211 can form the thinning groove 234, and the portion of the first insulating member 25 is accommodated in the thinning groove 234, so that the space between the limiting portion 232 of the fixing member 23 for assembling the electrode terminal 24 and the electrode terminal 24 in the thickness direction X of the wall portion can be expanded, so that the flat section 2332 of the connecting portion 233 and the portion of the first insulating member 25 in the thickness direction X of the wall portion can share the space at the same time while meeting the creepage distance between the electrode terminal 24 and the limiting portion 232, so as to reduce the overall size of the fixing member 23, the first insulating member 25 and the electrode terminal 24 in the thickness direction X of the wall portion, thereby reducing the distance between the limiting portion 232 and the wall portion 211 in the thickness direction X of the wall portion while the thickness of the portion of the first insulating member 25 between the limiting portion 232 and the electrode terminal 24 in the thickness direction X of the wall portion is unchanged and the insulation isolation between the limiting portion 232 and the electrode terminal 24 is met, so as to optimize the size of the fixing member 23 in the thickness direction X of the wall portion, and to optimize the size of the electrode terminal 24 in the thickness direction X of the wall portion, and further to reduce 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, so as to save the space occupied by the battery monomer 20 in the thickness direction X of the wall portion, which is beneficial to improving the energy density of the battery monomer 20.

[0281] Of course, the structure of the fixing member 23 is not limited to this, and in other embodiments, the fixing member 23 can also be other structures, for example, along the thickness direction X of the wall portion, the surface of the limiting portion 232 away from the wall portion 211 is closer to the wall portion 211 than the surface of the flat section 2332 away from the wall portion 211, and part of the first insulating member 25 is located on the side of the limiting portion 232 away from the wall portion 211. That is, the thinning groove 234 is a structure jointly defined by the surface of the limiting portion 232 away from the wall portion 211 in the thickness direction X of the wall portion and the end face of the electrode terminal 24 facing the electrode terminal 24 in the radial direction of the electrode terminal 24, and part of the first insulating member 25 is arranged on both sides of the limiting portion 232 in the thickness direction X of the wall portion, so that at least part of the limiting portion 232 is a structure embedded in the first insulating member 25.

[0282] In this embodiment, by arranging the surface of the limiting portion 232 away from the wall portion 211 to be closer to the wall portion 211 in the thickness direction X of the wall portion than the surface of the flat section 2332 away from the wall portion 211, the side of the limiting portion 232 away from the wall portion 211 can form the 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 arranged to cover at least part of the limiting portion 232, which is beneficial to further improve the insulation and isolation effect between the limiting portion 232 and the electrode terminal 24, and is beneficial to improve the assembly stability between the first insulating member 25 and the fixing member 23, and on the other hand, while improving the effect of the first insulating member 25 insulating and isolating the limiting portion 232 and the electrode terminal 24, the flat section 2332 of the connecting portion 233 and the first insulating member 25 can also share part of the space in the thickness direction X of the wall portion, 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 portion, thereby effectively improving the space utilization of the battery monomer 20.

[0283] According to some embodiments of the present application, the fixing member 23 can also be other structures, as shown in FIG. 11, along the thickness direction X of the wall portion, the surface of the limiting portion 232 away from the wall portion 211 is flush with the surface of the base portion 231 away from the wall portion 211. In this embodiment, the fixing member 23 is a structure that is thinned in the local area of the side facing the wall portion 211 in the thickness direction X of the wall portion, 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 portion 231.

[0284] In the embodiment, the fixing member 23 is partially thinned on the side facing the wall portion 211, and the surface of the limiting portion 232 facing away from the wall portion 211 is arranged to be coplanar with the surface of the base portion 231 facing away from the wall portion 211, so that the limiting portion 232 is formed by partially thinning the fixing member 23 on the side facing the wall portion 211, and the base portion 231 is the region of the fixing member 23 that is not thinned, thereby achieving that the thickness of the limiting portion 232 is smaller than the thickness of the base portion 231, and the structure is simple and easy to manufacture, and is conducive to reducing the processing difficulty of the fixing member 23.

[0285] According to some embodiments of the present application, the fixing member 23 can also have other structures, for example, referring to FIG. 12, which is a sectional view of the fixing member 23 provided by some other embodiments of the present application. Along the thickness direction X of the wall portion, 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 base portion 231 facing away from the wall portion 211, 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. That is, the side of the fixing member 23 facing away from the wall portion 211 in the thickness direction X of the wall portion is a stepped structure, so that the side of the fixing member 23 facing away from the wall portion 211 in the thickness direction X of the wall portion is formed with a receiving groove for accommodating the first insulating member 25.

[0286] In the 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 thickness direction X of the wall portion than the surface of the base portion 231 facing away from the wall portion 211, so that the fixing member 23 is partially thinned on the side facing the wall portion 211, 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, thereby on the one hand, the first insulating member 25 can be arranged to cover at least part of the limiting portion 232, which is conducive to further improving the insulation and isolation effect between the limiting portion 232 and the electrode terminal 24, and is conducive to improving the assembly stability between the first insulating member 25 and the fixing member 23, and on the other hand, while improving the effect of the first insulating member 25 insulating and isolating 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 also share part of the space in the thickness direction X of the wall portion, which is conducive to optimizing the space occupied by the fixing member 23 and the first insulating member 25 in the thickness direction X of the wall portion, thereby effectively improving the space utilization rate of the battery monomer 20.

[0287] In some embodiments, please continue to refer to FIG. 12, along the thickness direction X of the wall portion, the surface of the limiting portion 232 facing the wall portion 211 is flush with the surface of the base portion 231 facing the wall portion 211. That is, the fixing member 23 is a structure in which a local region on the side facing away from the wall portion 211 in the thickness direction X of the wall portion is thinned, so that the thinned region of the fixing member 23 is the limiting portion 232, and the region of the fixing member 23 that is not thinned is the base portion 231.

[0288] In the embodiment, the surface of the limiting portion 232 facing the wall portion 211 and the surface of the base portion 231 facing the wall portion 211 are arranged to be coplanar, the fixing member 23 is partially thinned on the side away from the wall portion 211 to form the limiting portion 232, and the area of the fixing member 23 that is not thinned is the base portion 231, so that the thickness of the limiting portion 232 is less than the thickness of the base portion 231, the structure is simple, and the fixing member 23 is easy to manufacture, which is conducive to reducing the processing difficulty of the fixing member 23.

[0289] According to some embodiments of the present application, referring to FIG. 6, and further referring to FIG. 13 and FIG. 14, FIG. 13 is an assembly schematic view of the fixing member 23 and the electrode terminal 24 provided by some embodiments of the present application, and FIG. 14 is a structural schematic view of the electrode terminal 24 provided by some embodiments of the present application. The electrode terminal 24 includes a body portion 241 and an assembly portion 242. The body portion 241 is electrically connected to the electrode assembly 22. The assembly portion 242 is protruded on the outer circumferential surface of the body portion 241, and part 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 the direction perpendicular to the thickness direction X of the wall portion, the limiting portion 232 is located between the base portion 231 and the body portion 241, and part of the first insulating member 25 is located between the outer circumferential surface of the limiting portion 232 and the body portion 241.

[0290] The body portion 241 extends into the terminal hole 2111 of the wall portion 211 in the thickness direction X of the wall portion, and the end of the body portion 241 close to the electrode assembly 22 is connected to the protruding portion 261 of the current collecting member 26 to be electrically connected to the electrode assembly 22 through the current collecting member 26, and the end of the body portion 241 away from the electrode assembly 22 is used to be connected to the busbar.

[0291] The assembly portion 242 is protruded on the outer circumferential surface of the body portion 241, that is, the assembly portion 242 of the electrode terminal 24 is a structure connected to the outer circumferential surface of the body portion 241 and extending in 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.

[0292] It should be noted that in other embodiments, the electrode terminal 24 can also not be provided with the assembly portion 242, and only the height of the body portion 241 is reduced, so that the outer circumferential surface of the body portion 241 is located between the limiting portion 232 and the wall portion 211 to realize the cooperation of the limiting portion 232 and the wall portion 211 to clamp part of the body portion 241.

[0293] In the direction perpendicular to the thickness direction X of the wall portion, the limiting portion 232 is located between the base portion 231 and the body portion 241, that is, the limiting portion 232 is connected to the end of the base portion 231 close to the body portion 241 in the radial direction of the electrode terminal 24, and exemplarily, in FIG. 6, the limiting portion 232 is a structure indirectly connected to the end of the base portion 231 close to the body portion 241 through the connecting portion 233.

[0294] In the direction perpendicular to the thickness direction X of the wall portion, the portion of the first insulating member 25 is located between the limiting portion 232 and the outer circumferential surface of the body portion 241, that is, the portion of the first insulating member 25 is arranged between the limiting portion 232 and the body portion 241 in the radial direction of the electrode terminal 24 to insulate and separate the limiting portion 232 and the body portion 241.

[0295] Exemplarily, the limiting portion 232 of the fixing member 23 is in a ring structure, and the limiting portion 232 is arranged outside the body portion 241, so that the limiting portion 232 defines a lead-out hole 2322, and the body portion 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 limiting portion 232 away from the wall portion 211. Correspondingly, the inner circumferential surface of the limiting portion 232 and the outer circumferential surface of the body portion 241 accommodate a portion of the first insulating member 25.

[0296] In the embodiment, the electrode terminal 24 is provided with the body portion 241 and the fitting portion 242, the fitting portion 242 of the electrode terminal 24 is a structure protruding on the outer circumferential surface of the body portion 241, and the limiting portion 232 is located between the base portion 231 and the body portion 241 in the direction perpendicular to the thickness direction X of the wall portion, so as to facilitate the extension of the fitting portion 242 between the wall portion 211 and the limiting portion 232, so that the portion of the electrode terminal 24 is located between the wall portion 211 and the limiting portion 232, which is simple in structure and facilitates the cooperation of the wall portion 211 and the limiting portion 232 to limit the fitting portion 242.

[0297] According to some embodiments of the present application, referring to FIG. 13 and FIG. 14, and further referring to FIG. 15 and FIG. 16, FIG. 15 is a front view of the electrode terminal 24 in the thickness direction X of the wall portion according to some embodiments of the present application, and FIG. 16 is a sectional view of the electrode terminal 24 according to some embodiments of the present application. The fitting portion 242 is arranged outside the body portion 241.

[0298] The fitting portion 242 is arranged outside the body portion 241, that is, the fitting portion 242 is in a ring structure and is arranged on the outer circumferential surface of the body portion 241. Of course, in other embodiments, the fitting portion 242 can also be a plurality of convex structures arranged on the outer circumferential surface of the body portion 241, and the plurality of convex structures are arranged at intervals along the circumferential direction of the body portion 241.

[0299] In the embodiment, by setting the assembly portion 242 as an annular structure surrounding the outer side of the body portion 241, the assembly portion 242 can be clamped and limited by the wall portion 211 and the limiting portion 232 at any position in the circumferential direction of the body portion 241, so that the electrode terminal 24 does not need to be positioned or adjusted in angle during the assembly of the electrode terminal 24, thereby facilitating to reduce the difficulty of assembling the assembly portion 242 of the electrode terminal 24 between the wall portion 211 and the limiting portion 232, and to improve the stability and reliability of the electrode terminal 24 assembled on the wall portion 211.

[0300] According to some embodiments of the present application, referring to FIG. 14, FIG. 15 and FIG. 16, and further referring to FIG. 17, FIG. 8 and FIG. 19, FIG. 17 is a partial sectional view of the battery cell 20 perpendicular to the thickness direction thereof according to some embodiments of the present application, FIG. 18 is a partial enlarged view of D of the battery cell 20 shown in FIG. 17, and FIG. 19 is a structural schematic view of the first insulating member 25 according to some embodiments of the present application. One of the body portion 241 and the first insulating member 25 is provided with a first limiting protrusion 2411, and the other is provided with a first limiting groove 251, and the first limiting protrusion 2411 is accommodated in the first limiting groove 251.

[0301] The first limiting groove 251 and the first limiting protrusion 2411 are configured to limit the rotation of the electrode terminal 24 relative to the first insulating member 25, i.e., after the first limiting protrusion 2411 is inserted into the first limiting groove 251, the circumferential locking between the electrode terminal 24 and the first insulating member 25 can be achieved to limit the rotation of the electrode terminal 24 relative to the first insulating member 25 about the axis extending along the thickness direction X of the wall portion.

[0302] For example, in FIG. 14, FIG. 18 and FIG. 19, the first limiting protrusion 2411 is protruded on the outer circumferential surface of the body portion 241 of the electrode terminal 24, and correspondingly, the first limiting groove 251 is arranged on the inner circumferential surface of the first insulating member 25. Of course, in other embodiments, the first limiting groove 251 can be arranged on the outer circumferential surface of the body portion 241, and correspondingly, the first limiting protrusion 2411 is protruded on the inner circumferential surface of the first insulating member 25.

[0303] In the embodiment, the first limiting protrusion 2411 is arranged on one of the body portion 241 and the first insulating member 25, and the first limiting groove 251 is arranged on the other one, 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, to achieve the circumferential locking between the body portion 241 and the first insulating member 25, which is conducive to relieving the phenomenon that the electrode terminal 24 rotates relative to the first insulating member 25 about the axis extending along the thickness direction X of the wall portion, on the one hand, the assembly precision between the electrode terminal 24 and the first insulating member 25 can be improved, and the assembly difficulty between the electrode terminal 24 and the first insulating member 25 can be reduced, on the other hand, the structural stability of the electrode terminal 24 assembled on the wall portion 211 can be improved.

[0304] In some embodiments, referring to FIGS. 14 and 15 and FIG. 19, the first limiting protrusion 2411 is a plurality, the plurality of first limiting protrusions 2411 are arranged at intervals along the circumference of the body portion 241, and the first limiting groove 251 is arranged correspondingly to the first limiting protrusion 2411, each first limiting groove 251 is used to accommodate one first limiting protrusion 2411.

[0305] For example, a plurality of first limiting protrusions 2411 are protruded on the outer circumferential surface of the body portion 241, the plurality of first limiting protrusions 2411 are arranged at intervals along the circumference of the body portion 241, correspondingly, a plurality of first limiting grooves 251 are arranged on the inner circumferential surface of the first insulating member 25, the plurality of first limiting grooves 251 are arranged around the body portion 241, so that each first limiting protrusion 2411 can be inserted into one first limiting groove 251.

[0306] For example, six first limiting protrusions 2411 are protruded on the outer circumferential surface of the body portion 241, correspondingly, six first limiting grooves 251 are arranged on the inner circumferential surface of the first insulating member 25, of course, in other embodiments, the number of first limiting protrusions 2411 and first limiting grooves 251 can also be two, three, four, five or seven, etc.

[0307] In the embodiment, by arranging the first limiting protrusion 2411 as a plurality, and the plurality of first limiting protrusions 2411 are arranged at intervals along the circumference of the body portion 241, each first limiting protrusion 2411 is correspondingly inserted into one first limiting groove 251, the battery monomer 20 adopting this structure can further improve the limiting effect of the circumferential locking between the electrode terminal 24 and the first insulating member 25, thereby being conducive to further relieving the phenomenon that the electrode terminal 24 rotates relative to the first insulating member 25 about the axis extending along the thickness direction X of the wall portion.

[0308] In some embodiments, referring to FIGS. 14, 16, 18 and 19, the outer circumferential surface of the body portion 241 is provided with a first limiting protrusion 2411, and the first insulating member 25 is provided with a first limiting groove 251.

[0309] The first limiting protrusion 2411 is provided on the outer circumferential surface of the body portion 241, and the first limiting groove 251 is provided on the inner circumferential surface of the first insulating member 25.

[0310] In the present embodiment, the first limiting protrusion 2411 is a structure provided on the outer circumferential surface of the body portion 241, and the first limiting groove 251 is a structure provided on the first insulating member 25. The battery cell 20 adopting such a structure does not need to be slotted on the body portion 241 of the electrode terminal 24, which is conducive to improving the structural strength of the electrode terminal 24 and the overcurrent capacity of the electrode terminal 24.

[0311] In some embodiments, referring to FIGS. 14, 15, 16 and 18, the size of the first limiting protrusion 2411 protruding from the outer circumferential surface of the body portion 241 is smaller than the size of the assembly portion 242 protruding from the outer circumferential surface of the body portion 241. That is, 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 assembly 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 body portion 241 and the outer circumferential surface of the assembly portion 242.

[0312] In the present embodiment, by setting the size of the first limiting protrusion 2411 protruding from the outer circumferential surface of the body portion 241 to be smaller than the size of the assembly portion 242 protruding from the outer circumferential surface of the body portion 241, the interference phenomenon between the first limiting protrusion 2411 and the base portion 231 of the fixing member 23 is alleviated, and the space occupied by the first limiting protrusion 2411 in the radial direction of the electrode terminal 24 is saved, 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 to cause poor insulation effect.

[0313] According to some embodiments of the present application, referring to FIGS. 13, 14, 16 and 18, 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. That is, the first limiting protrusion 2411 and the assembly portion 242 are connected to each other on the surface of the side of the wall portion 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 provided on the side of the assembly portion 242 facing the limiting portion 232.

[0314] In the 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 providing the first limiting groove 251 on the first insulating piece 25 can be reduced, and the assembly difficulty between the electrode terminal 24 and the first insulating piece 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, without increasing the distance between the limiting portion 232 and the wall portion 211 in order to avoid the first limiting protrusion 2411, thereby facilitating to save the space occupied by the fixing piece 23 and the wall portion 211 in the thickness direction X of the wall portion, so as to optimize the size of the battery monomer 20 in the thickness direction X of the wall portion.

[0315] According to some embodiments of the application, as shown in FIG. 13, the first limiting protrusion 2411 is spaced apart from the limiting portion 232 along the thickness direction X of the wall portion.

[0316] In the embodiment, by setting the first limiting protrusion 2411 and the limiting portion 232 to be spaced apart in the thickness direction X of the wall portion, the interference phenomenon between the first limiting protrusion 2411 and the limiting portion 232 can be reduced, and the first insulating piece 25 can be arranged between the first limiting protrusion 2411 and the limiting portion 232, so as to reduce the risk of short circuit between the first limiting protrusion 2411 and the fixing piece 23.

[0317] According to some embodiments of the application, as shown in FIG. 14, FIG. 15, FIG. 18 and FIG. 19, the orthographic projection of the first limiting protrusion 2411 and the orthographic projection of the limiting portion 232 do not overlap in the same plane perpendicular to the thickness direction X of the wall portion.

[0318] 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 overlap in the thickness direction X of the wall portion.

[0319] Exemplarily, refer to FIG. 15 and FIG. 18, and further refer to FIG. 20 and FIG. 21, FIG. 20 is a structural schematic view of the fixing member 23 provided by some embodiments of the present application, and FIG. 21 is a front view of the fixing member 23 in the thickness direction X of the wall portion. The second limiting groove 2321 is arranged on the limiting portion 232, and in the embodiment in which the second limiting groove 2321 penetrates the limiting portion 232 along the thickness direction X of the wall portion, the first limiting protrusion 2411 is arranged in one-to-one correspondence with the second limiting groove 2321, and the projection of the first limiting protrusion 2411 in the thickness direction X of the wall portion is located in the second limiting groove 2321, so as to realize that the front projection of the first limiting protrusion 2411 and the limiting portion 232 in the same plane perpendicular to the thickness direction X of the wall portion does not overlap.

[0320] In the present embodiment, by arranging the first limiting protrusion 2411 and the limiting portion 232 in a structure in which the projections in the thickness direction X of the wall portion do not overlap, on the one hand, the interference 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.

[0321] According to some embodiments of the present application, refer to FIG. 18, FIG. 19, FIG. 20 and FIG. 21, 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 the second limiting groove 2321, and the other is provided with the second limiting protrusion 252, and the second limiting protrusion 252 is accommodated in the second limiting groove 2321.

[0322] Wherein, the fixing member 23 is arranged around the electrode terminal 24, that is, the fixing member 23 is in a ring structure and surrounds the outside of the electrode terminal 24.

[0323] 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, the circumferential locking between the fixing member 23 and the first insulating member 25 can be realized, so as to limit the rotation of the fixing member 23 relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall portion.

[0324] Exemplarily, the second limiting protrusion 252 is protruded on the outer circumferential surface of the first insulating member 25, and correspondingly, the second limiting groove 2321 is arranged on the inner circumferential surface of the limiting portion 232. Of course, in other embodiments, the second limiting groove 2321 can be arranged on the outer circumferential surface of the first insulating member 25, and correspondingly, the second limiting protrusion 252 is protruded on the inner circumferential surface of the limiting portion 232.

[0325] In the embodiment, by setting the fixing member 23 as a structure surrounding the electrode terminal 24, and one of the first insulating member 25 and the limiting portion 232 is provided with the second limiting protrusion 252, and the other is provided with the 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, to achieve the circumferential locking between the fixing member 23 and the first insulating member 25, which is beneficial to alleviate the phenomenon that the fixing member 23 rotates relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall portion. On the one hand, it can improve the assembly precision between the fixing member 23 and the first insulating member 25, and can reduce the assembly difficulty between the fixing member 23 and the first insulating member 25, on the other hand, it can improve the structural stability and reliability of the fixing member 23 connected to the wall portion 211.

[0326] In some embodiments, referring to FIGS. 19, 20 and 21, the second limiting groove 2321 is a plurality of second limiting grooves 2321, and the plurality of second limiting grooves 2321 are arranged in a circumferential direction of the fixing member 23. The second limiting protrusion 252 is correspondingly arranged. Each second limiting groove 2321 is used to accommodate one second limiting protrusion 252.

[0327] For example, a plurality of second limiting protrusions 252 are protruded on the outer circumferential surface of the first insulating member 25, and the plurality of second limiting protrusions 252 are arranged in a circumferential direction of the first insulating member 25. Correspondingly, a plurality of second limiting grooves 2321 are arranged on the limiting portion 232, and the plurality of second limiting grooves 2321 are arranged around the body portion 241, so that each second limiting protrusion 252 can be inserted into one second limiting groove 2321.

[0328] For example, six second limiting grooves 2321 are arranged on the limiting portion 232, and correspondingly, six second limiting protrusions 252 are protruded on the outer circumferential surface of the first insulating member 25. Of course, in other embodiments, the number of second limiting grooves 2321 and second limiting protrusions 252 can also be two, three, four, five or seven, etc.

[0329] In the embodiment, by setting the second limiting groove 2321 as a plurality of second limiting grooves 2321, and the plurality of second limiting grooves 2321 are arranged in a circumferential direction of the fixing member 23. Each second limiting groove 2321 is used for inserting one second limiting protrusion 252. The battery monomer 20 adopting this structure can further improve the limiting effect of the circumferential locking between the fixing member 23 and the first insulating member 25, thereby further alleviating the phenomenon that the fixing member 23 rotates relative to the first insulating member 25 around the axis extending along the thickness direction X of the wall portion.

[0330] In some embodiments, referring to FIGS. 18, 19, 20 and 21, the limiting portion 232 is provided with a second limiting groove 2321, and the first insulating piece 25 is provided with a second limiting protrusion 252.

[0331] The second limiting groove 2321 is arranged on the inner circumferential surface of the limiting portion 232, and the second limiting protrusion 252 is arranged on the outer circumferential surface of the first insulating piece 25. It should be noted that in the embodiment in which the limiting portion 232 of the fixing piece 23 is arranged in a ring structure around the body portion 241, and the limiting portion 232 defines the lead-out hole 2322, the second limiting groove 2321 is arranged on the hole wall surface of the lead-out hole 2322.

[0332] In the present embodiment, by arranging the second limiting groove 2321 on the limiting portion 232, and correspondingly arranging the second limiting protrusion 252 on the first insulating piece 25, the battery monomer 20 with such a structure is convenient for machining the second limiting groove 2321 on the limiting portion 232, and convenient for assembling the second limiting protrusion 252 of the first insulating piece 25 in the second limiting groove 2321, which is conducive to reducing the manufacturing difficulty of the battery monomer 20, and on the other hand, without arranging the second limiting protrusion 252 on the limiting portion 232, the second limiting protrusion 252 will not occupy the space of the limiting portion 232, which is conducive to relieving the interference phenomenon between the second limiting protrusion 252 and the electrode terminal 24.

[0333] According to some embodiments of the present application, referring to FIGS. 7, 18, 20 and 21, along the thickness direction X of the wall portion, the second limiting groove 2321 penetrates through both sides of the limiting portion 232. That is, the two ends of the second limiting groove 2321 in the thickness direction X of the wall portion extend to the surfaces of both sides of the limiting portion 232 in the thickness direction X of the wall portion, respectively.

[0334] The first limiting protrusion 2411 is arranged between the two opposite groove sides of the second limiting groove 2321 along the circumferential direction of the body portion 241, and the first limiting protrusion 2411 corresponds to the second limiting groove 2321 one by one, so that the first limiting protrusion 2411 is arranged corresponding to the second limiting groove 2321, which can further relieve the interference phenomenon between the first limiting protrusion 2411 and the limiting portion 232, and can improve the thickness of the part of the first insulating piece 25 between the limiting portion 232 and the first limiting protrusion 2411, which is conducive to improving the effect of insulating and isolating the electrode terminal 24 and the fixing piece 23 of the first insulating piece 25.

[0335] It should be noted that in other embodiments, the second limiting groove 2321 can also be a structure that is only arranged on the inner circumferential surface of the limiting portion 232 and does not penetrate both sides of the limiting portion 232 in the thickness direction X of the wall portion, and of course, the second limiting groove 2321 can also be a structure that only penetrates one side of the limiting portion 232 in the thickness direction X of the wall portion.

[0336] In the present embodiment, by arranging the second limiting groove 2321 as a structure that penetrates both sides of the limiting portion 232 in the thickness direction X of the wall portion, on the one hand, the difficulty of arranging the second limiting groove 2321 on the limiting portion 232 can be reduced, and the second limiting protrusion 252 on the first insulating piece 25 can be easily assembled into the second limiting groove 2321, on the other hand, the space for accommodating the second limiting protrusion 252 of the second limiting groove 2321 can be further increased, which is beneficial to improve the limiting effect between the first insulating piece 25 and the fixing piece 23.

[0337] According to some embodiments of the present application, as shown in FIGS. 6, 7 and 13, the limiting portion 232 is arranged around the electrode terminal 24, so that the limiting portion 232 encloses the lead-out hole 2322. In the thickness direction X of the wall portion, the electrode terminal 24 is arranged in the lead-out hole 2322, and the electrode terminal 24 extends out of the limiting portion 232 away from one side of the wall portion 211.

[0338] The electrode terminal 24 includes a body portion 241 and an assembly portion 242, the assembly portion 242 is protruding on the outer circumferential surface of the body portion 241, one end of the body portion 241 close to the electrode assembly 22 in the thickness direction X of the wall portion is used for electrical connection with the electrode assembly 22, and the body portion 241 is arranged in the lead-out hole 2322 in the thickness direction X of the wall portion and extends out of the limiting portion 232 away from one side of the wall portion 211, so that one end of the body portion 241 away from the electrode assembly 22 in the thickness direction X of the wall portion is assembled and connected with the busbar.

[0339] In the present embodiment, by arranging the electrode terminal 24 as a structure that is arranged in the lead-out hole 2322 in the thickness direction X of the wall portion and extends out of the limiting portion 232 away from one side of the wall portion 211, the electrode terminal 24 and other components can be easily assembled and connected with each other, which is beneficial to reduce the difficulty of the electrode terminal 24 outputting or inputting the electric energy of the battery monomer 20. In addition, the thickness of the limiting portion 232 is smaller than the thickness of the base portion 231, so that while meeting the connection needs of the base portion 231 and the wall portion 211, the size of the part of the electrode terminal 24 arranged in 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 piece 23 and the wall portion 211 in the thickness direction X of the wall portion, and optimizing the size of the battery monomer 20 in the thickness direction X of the wall portion.

[0340] According to some embodiments of the present application, referring to FIG. 5 and FIG. 6, the fixing member 23 is provided separately from the wall portion 211. That is, the fixing member 23 and the wall portion 211 are provided in a separate structure, and the fixing member 23 is connected to the wall portion 211.

[0341] Exemplarily, in the structure in which the fixing member 23 is provided separately from the wall portion 211, the structure in which the fixing member 23 is connected to the wall portion 211 can be various, such as welding connection, adhesion, clamping, or bolted connection, etc.

[0342] In the present embodiment, by providing the fixing member 23 and the wall portion 211 in a separate structure, it is beneficial to reduce the difficulty of providing the fixing member 23 on the wall portion 211, and facilitate the assembly of the first insulating member 25 between the fixing member 23 and the electrode terminal 24, thereby facilitating the assembly difficulty of the battery monomer 20.

[0343] In some embodiments, the base portion 231 is welded to the wall portion 211.

[0344] Exemplarily, the base portion 231 and the wall portion 211 are welded by laser welding.

[0345] In the present embodiment, the base portion 231 and the wall portion 211 are connected by welding, which can effectively improve the connection stability and reliability between the base portion 231 and the wall portion 211, and reduce the assembly difficulty between the fixing member 23 and the wall portion 211.

[0346] Of course, the structure of the battery monomer 20 is not limited to this, and in other embodiments, the battery monomer 20 can also be other structures, such as referring to FIG. 22 and FIG. 23, FIG. 22 is a partial sectional view of the battery monomer 20 perpendicular to the length direction thereof according to some other embodiments of the present application, and FIG. 23 is a partial enlarged view of E of the battery monomer 20 shown in FIG. 22. The fixing member 23 is integrally formed with the wall portion 211.

[0347] In which, the fixing member 23 is integrally formed with the wall portion 211, that is, the fixing member 23 and the wall portion 211 are provided in an integrated structure, that is, the fixing member 23 and the wall portion 211 are formed by an integral molding process, such as stamping, casting, or milling, etc.

[0348] It should be noted that, in the structure in which the fixing member 23 and the wall portion 211 are integrally formed, referring to FIG. 23, the fixing member 23 can only include the base portion 231 and the limiting portion 232, the base portion 231 is connected to the wall portion 211 and is provided in an acute angle with the thickness direction X of the wall portion, and correspondingly, the limiting portion 232 is arranged in the thickness direction X of the wall portion 211, and the limiting portion 232 is parallel to the wall portion 211.

[0349] In the embodiment, the fixing member 23 and the wall portion 211 are integrally formed, so that the fixing member 23 and the wall portion 211 are an integral structure formed by an integral forming process, thereby improving the connection strength and stability between the fixing member 23 and the wall portion 211, and improving the stability of the limiting portion 232 of the fixing member 23 and the wall portion 211 in assembling the electrode terminal 24, thereby facilitating the reliability of the electrode terminal 24 assembled on the wall portion 211.

[0350] According to some embodiments of the present application, as shown in FIGS. 6, 7 and 8, the thickness of the limiting portion 232 is D1, and the thickness of the base portion 231 is D2, satisfying 0.3D2≤D1≤0.8D2.

[0351] Wherein, the limiting portion 232 and the base portion 231 are structures extending in the direction perpendicular to the thickness direction X of the wall portion, and correspondingly, the thickness D1 of the limiting portion 232 is the size of the limiting portion 232 in the thickness direction X of the wall portion, and the thickness D2 of the base portion 231 is the size of the base portion 231 in the thickness direction X of the wall portion.

[0352] Exemplarily, the ratio of the thickness D1 of the limiting portion 232 to the thickness D2 of the base portion 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.

[0353] In the embodiment, by setting the ratio of the thickness of the limiting portion 232 to the thickness of the base portion 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 portion 231, to improve the structural strength of the limiting portion 232, and facilitate the reduction of the phenomenon of fracture or deformation of the limiting portion 232 during use, thereby improving the stability and reliability of the fixing member 23 in assembling the electrode terminal 24, and on the other hand, the thickness of the limiting portion 232 is set to be less than or equal to 0.8 times the thickness of the base portion 231, so that while meeting the requirements of the connection quality and strength of the base portion 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 further expanded, which is conducive to further improving the thickness of the part of the first insulating member 25 arranged between the limiting portion 232 and the electrode terminal 24, thereby increasing the creepage distance between the limiting portion 232 and the electrode terminal 24, to further alleviate the phenomenon of short circuit of the limiting portion 232 and the electrode terminal 24 during use.

[0354] In some embodiments, referring to FIG. 8, the thickness of the limiting portion 232 is D1, which satisfies 0.5mm≤D1≤1.5mm.

[0355] For example, 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.

[0356] In the present embodiment, by setting the thickness of the limiting portion 232 to 0.5mm to 1.5mm, on the one hand, the structural strength of the limiting portion 232 can be improved, so as to reduce the risk of fracture or deformation of the limiting portion 232 during use, and on the other hand, the space occupied by the limiting portion 232 can be saved, which is conducive to optimizing the overall size 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 rate of the battery monomer 20.

[0357] According to some embodiments of the present application, referring to FIGS. 5 and 6 and FIGS. 17 and 18, at least part of the limiting portion 232 is embedded in the first insulating member 25, and part of the first insulating member 25 is located on the side of the limiting portion 232 away from the wall portion 211 along the thickness direction X of the wall portion.

[0358] In the present embodiment, by embedding at least part of the limiting portion 232 of the fixing member 23 in the first insulating member 25, and locating part of the first insulating member 25 on the side of the limiting portion 232 away from the wall portion 211, the first insulating member 25 is a structure wrapped on the outside of at least part of the limiting portion 232, so as to further improve the connection strength between the fixing member 23 and the first insulating member 25, so as to improve the assembly stability and firmness between the fixing member 23 and the first insulating member 25, thereby reducing the risk of falling off between the first insulating member 25 and the fixing member 23, which is conducive to improving the assembly quality of the battery monomer 20.

[0359] According to some embodiments of the present application, referring to FIGS. 5 and 6, along the thickness direction X of the wall portion, the side of the wall portion 211 facing the limiting portion 232 is provided with an assembly groove 2112, and at least part of the base portion 231 is accommodated in the assembly groove 2112.

[0360] Wherein, the terminal hole 2111 is arranged on the groove bottom surface of the assembly groove 2112, and the terminal penetrates the groove bottom wall of the assembly groove 2112 to communicate the inside and outside of the shell 21.

[0361] 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 can be entirely accommodated in the assembly groove 2112. For example, in FIG. 6, the base 231 of the fixing member 23 is entirely accommodated in the assembly groove 2112, that is, the base 231 does not protrude beyond the groove of the assembly groove 2112 in the thickness direction X of the wall portion.

[0362] In the present embodiment, by arranging the assembly groove 2112 for accommodating the base 231 on the side of the wall portion 211 facing the limiting portion 232, at least part of the base 231 of the fixing member 23 can be inserted into the assembly groove 2112, which is advantageous for further saving 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 assembly difficulty between the wall portion 211 and the base 231 of the fixing member 23.

[0363] In some embodiments, referring to FIG. 6, the base 231 abuts against the groove bottom surface of the assembly groove 2112, and the base 231 abuts against the groove side surface of the assembly groove 2112. That is, the surface of the base 231 facing the side of the groove bottom surface of the assembly groove 2112 in the thickness direction X of the wall portion abuts against the groove bottom surface of the assembly groove 2112, and the surface of the base 231 away from one end of the electrode terminal 24 in the radial direction of the electrode terminal 24 abuts against the groove side surface of the assembly groove 2112.

[0364] It should be noted that in the embodiment in which the fixing member 23 is in a ring structure surrounding the outer side of the electrode terminal 24, the annular groove of the assembly groove 2112 corresponds to the outer circumferential surface of the base 231 abutting against the groove side surface of the assembly groove 2112.

[0365] In the present embodiment, by arranging the base 231 of the fixing member 23 to abut against both the groove bottom surface and the groove side surface of the assembly groove 2112, the assembly groove 2112 can also limit and position the base 231 of the fixing member 23, which can improve the precision of the fixing member 23 assembled on the wall portion 211, reduce the connection difficulty between the fixing member 23 and the wall portion 211, and further improve the structural stability and reliability of the fixing member 23 assembled on the wall portion 211.

[0366] According to some embodiments of the present application, referring to FIGS. 6, 7, 20 and 21, the fixing member 23 surrounds the electrode terminal 24.

[0367] In the present embodiment, the fixing member 23 is in a ring structure surrounding the outer side of the body portion 241 of the electrode terminal 24, and the limiting portion 232 is a structure connected to the inner circumferential surface of the base 231 through the connecting portion 233, and correspondingly, the limiting portion 232 is connected to the inner circumferential surface of the connecting portion 233.

[0368] In the embodiment, the fixing member 23 is arranged in a ring structure surrounding the electrode terminal 24, so that the fixing member 23 can be assembled with the electrode terminal 24 at any position in the circumferential direction of the fixing member 23, and the fixing member 23 does not need to be positioned or adjusted in angle during the assembly of the fixing member 23 and the electrode terminal 24, thereby facilitating the assembly of the fixing member 23 and the wall portion 211 and the electrode terminal 24, and improving the stability and reliability of the electrode terminal 24 assembled on the wall portion 211.

[0369] According to some embodiments of the present application, as shown in FIGS. 5 and 6 and FIGS. 17 and 18, along the thickness direction X of the wall portion, the base portion 231 is connected to the side of the wall portion 211 away from the electrode assembly 22. That is, the fixing member 23 is connected to the side of the wall portion 211 away from the electrode assembly 22, so that the limiting portion 232 of the fixing member 23 is a structure for assembling the electrode terminal 24 on the outer side of the shell 21 and with the wall portion 211, so as to enable the limiting portion 232 to limit the electrode terminal 24 from moving in the thickness direction X of the wall portion away from the electrode assembly 22.

[0370] In the embodiment, the fixing member 23 is arranged in a ring structure surrounding the electrode terminal 24, so that the fixing member 23 can be assembled with the electrode terminal 24 at any position in the circumferential direction of the fixing member 23, and the fixing member 23 does not need to be positioned or adjusted in angle during the assembly of the fixing member 23 and the electrode terminal 24, thereby facilitating the assembly of the fixing member 23 and the wall portion 211 and the electrode terminal 24, and improving the stability and reliability of the electrode terminal 24 assembled on the wall portion 211.

[0371] In the embodiment, the fixing member 23 is arranged in a ring structure surrounding the electrode terminal 24, so that the fixing member 23 can be assembled with the electrode terminal 24 at any position in the circumferential direction of the fixing member 23, and the fixing member 23 does not need to be positioned or adjusted in angle during the assembly of the fixing member 23 and the electrode terminal 24, thereby facilitating the assembly of the fixing member 23 and the wall portion 211 and the electrode terminal 24, and improving the stability and reliability of the electrode terminal 24 assembled on the wall portion 211.

[0372] According to some embodiments of the present application, as shown in FIGS. 5 and 6 and FIGS. 17 and 18, the battery monomer 20 can further include a second insulating member 27, and at least part of the second insulating member 27 is arranged between the wall portion 211 and the electrode terminal 24 along the thickness direction X of the wall portion.

[0373] 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 separate the wall portion 211 and the electrode terminal 24.

[0374] For example, the material of the second insulating member 27 can be rubber, plastic, or silicone.

[0375] In this embodiment, the battery monomer 20 is also provided with the 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 separated by the second insulating member 27, which is conducive to reducing the risk of short circuit between the electrode terminal 24 and the wall portion 211.

[0376] In some embodiments, as shown in FIGS. 5 and 6 and FIGS. 17 and 18, the wall portion 211 is provided with a terminal hole 2111, which penetrates the wall portion 211 in 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 arranged around the terminal hole 2111, and the second insulating member 27 is also configured to seal the gap between the wall portion 211 and the electrode terminal 24.

[0377] The second insulating member 27 is arranged around the terminal hole 2111, that is, the second insulating member 27 has an annular structure extending in the circumferential direction of the terminal.

[0378] Optionally, referring to FIG. 5 and FIG. 6, the second insulating member 27 has a first extending portion 271 extending into the terminal hole 2111 along the thickness direction X of the wall portion, and the third insulating member 28 has a second extending portion 281 extending into the terminal hole 2111 along the thickness direction X of the wall portion. The second extending portion 281 and the first extending portion 271 abut each other along the thickness direction X of the wall portion. The second extending portion 281 and the first extending portion 271 are annular structures extending along the circumferential direction of the hole wall surface of the terminal hole 2111. The second extending portion 281 and the first extending portion 271 are configured to insulate and separate the electrode terminal 24 and the hole wall surface of the terminal hole 2111, and the protruding portion 261 of the current collecting member 26 and the hole wall surface of the terminal hole 2111. After the protruding portion 261 of the current collecting member 26 is connected to the electrode terminal 24, the first extending portion 271 is located between the protruding portion 261 and the hole wall surface of the terminal hole 2111, and between the electrode terminal 24 and the hole wall surface of the terminal hole 2111. The second extending portion 281 is located between the protruding portion 261 and the hole wall surface of the terminal hole 2111, and between the electrode terminal 24 and the hole wall surface of the terminal hole 2111, so as to insulate and separate the protruding portion 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.

[0379] In the present embodiment, the wall portion 211 is further provided with a terminal hole 2111 for inserting the electrode terminal 24, so as to facilitate the electrical connection between the electrode terminal 24 and the electrode assembly 22 accommodated in the shell 21. By configuring the second insulating member 27 to surround the terminal hole 2111, the second insulating member 27 can also seal the gap between the wall portion 211 and the electrode terminal 24, thereby reducing the risk of liquid leakage at the terminal hole 2111 of the battery monomer 20.

[0380] According to some embodiments of the present application, referring to FIG. 24, FIG. 24 is a sectional view of the fixing member 23 provided by some other embodiments of the present application. The fixing member 23 comprises a first material layer 235 and a second material layer 236 connected to each other. The first material layer 235 is partially located in the base portion 231, and the portion of the first material layer 235 located in the base portion 231 is connected to the wall portion 211. At least a portion of the second material layer 236 is located in the limiting portion 232, and the hardness of the second material layer 236 is greater than the hardness of the first material layer 235.

[0381] The connection structure between the portion of the first material layer 235 located in the base portion 231 and the wall portion 211 can be various, such as welding connection or adhesive connection, etc. Similarly, the connection structure between the first material layer 235 and the second material layer 236 can also be various, such as adhesive connection, welding connection or composite connection, etc.

[0382] Exemplarily, in FIG. 24, 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 outer side 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 circumferential side of the first material layer 235.

[0383] At least part of the second material layer 236 is located in the limiting portion 232, that is, the second material layer 236 can be only partially located in the limiting portion 232, or all of the second material layer 236 can be located in the limiting portion 232, that is, only the limiting portion 232 contains the second material layer 236. Exemplarily, in FIG. 24, the first material layer 235 and the second material layer 236 are structures that are integrally stacked in the thickness direction X of the wall portion. Correspondingly, the base portion 231 and 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.

[0384] It should be noted that the hardness is an inherent property of the material itself. Therefore, the hardness of the second material layer 236 being greater than the hardness of the first material layer 235 means that 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.

[0385] In this embodiment, by setting the fixing member 23 to have a composite structure including the first material layer 235 and the second material layer 236 and the hardness of the second material layer 236 being greater than the hardness 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 part of the first material layer 235 located in the base portion 231, which is conducive to reducing the connection difficulty between the fixing member 23 and the wall portion 211. At least part of the second material layer 236 is located in the limiting portion 232, so as to further improve the structural strength of the limiting portion 232 while reducing the connection difficulty between the fixing member 23 and the wall portion 211, which is conducive to reducing the risk of fracture or deformation of the limiting portion 232, thereby improving the assembly effect of the fixing member 23 on the electrode terminal 24. In the case of the limiting portion 232 having the same strength, the thickness of the limiting portion 232 can be further reduced, which is conducive to further optimizing the size of the fixing member 23 in the thickness direction X of the wall portion.

[0386] In some embodiments, referring to FIG. 24, part of the first material layer 235 is located in the limiting portion 232, and at least part of the first material layer 235 and the second material layer 236 located in the limiting portion 232 overlap in the thickness direction X of the wall portion.

[0387] Part of the first material layer 235 is located in the limiting portion 232, that is, the limiting portion 232 contains both the first material layer 235 and the second material layer 236.

[0388] Along the thickness direction X of the wall portion, at least part of the first material layer 235 and the second material layer 236 located in the limiting portion 232 overlap, that is, at least part of 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 overlap in the same plane perpendicular to the thickness direction X of the wall portion. For example, in FIG. 24, 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.

[0389] In this embodiment, by arranging the first material layer 235 and the second material layer 236 in the limiting portion 232, and at least part of the first material layer 235 and the second material layer 236 located in the limiting portion 232 overlap 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, so as to reduce the connection difficulty of the first material layer 235 and the second material layer 236 in the limiting portion 232, 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 strengthened, which is beneficial to further improve the structural strength of the limiting portion 232.

[0390] In some embodiments, referring to FIG. 24, part of the second material layer 236 is located in the base portion 231, and along the thickness direction X of the wall portion, at least part of the first material layer 235 and the second material layer 236 located in the base portion 231 overlap.

[0391] Part of the first material layer 235 is located in the base portion 231, and part of the second material layer 236 is located in the base portion 231, that is, the base portion 231 contains both the first material layer 235 and the second material layer 236.

[0392] Along the thickness direction X of the wall portion, at least part of the first material layer 235 and the second material layer 236 located in the base portion 231 overlap, that is, at least part of the orthographic projection of the first material layer 235 located in the base portion 231 and the orthographic projection of the second material layer 236 located in the base portion 231 overlap in the same plane perpendicular to the thickness direction X of the wall portion. For example, in FIG. 24, the first material layer 235 and the second material layer 236 located in the base portion 231 completely overlap in the thickness direction X of the wall portion.

[0393] In the embodiment, by arranging the part of the first material layer 235 and the 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 in the base 231 overlap, on the one hand, the first material layer 235 in the base 231 is connected with the wall 211, and on the other hand, the structural strength of the base 231 is improved, which is beneficial to reduce the risk of cracking or deformation of the base 231, so as to improve the overall structural strength of the fixing piece 23.

[0394] In some embodiments, please continue to refer to FIG. 24, the base 231 and the limiting portion 232 are arranged along the thickness direction X of the wall, and the fixing piece 23 can further include a connecting portion 233 connecting the base 231 and the limiting portion 232. The part of the first material layer 235 is located in the connecting portion 233, and the part of the second material layer 236 is located in the connecting portion 233. Along the thickness direction X of the wall, at least part of the first material layer 235 and the second material layer 236 in the connecting portion 233 overlap.

[0395] Among them, the part of the first material layer 235 is located in the connecting portion 233, and the part of the second material layer 236 is located in the connecting portion 233, that is, the connecting portion 233 of the fixing piece 23 contains both the first material layer 235 and the second material layer 236.

[0396] Along the thickness direction X of the wall, at least part of the first material layer 235 and the second material layer 236 in the connecting portion 233 overlap, that is, in the same plane perpendicular to the thickness direction X of the wall, at least part of the orthographic projection of the first material layer 235 in the connecting portion 233 and the orthographic projection of the second material layer 236 in the connecting portion 233 overlap. For example, in FIG. 24, the first material layer 235 and the second material layer 236 in the connecting portion 233 completely overlap in the thickness direction X of the wall.

[0397] It should be noted that in the embodiment in which the connecting portion 233 includes the curved section 2331 and the straight section 2332, the part of the first material layer 235 is located in the curved section 2331, the part of the second material layer 236 is located in the curved section 2331, the part of the first material layer 235 is located in the straight section 2332, and the part of the second material layer 236 is located in the straight section 2332.

[0398] In the embodiment, the fixing member 23 is further provided with a connecting portion 233 connecting the limiting portion 232 and the base portion 231, so as to facilitate the cooperation of the limiting portion 232 and the wall portion 211 to clamp the electrode terminal 24, and reduce the assembly difficulty between the fixing member 23 and the wall portion 211. By arranging the first material layer 235 and the second material layer 236 in the connecting portion 233, and at least partially overlapping the first material layer 235 and the second material layer 236 in the connecting portion 233, the structural strength of the connecting portion 233 is improved, which is beneficial to reduce the risk of fracture or deformation of the connecting portion 233, and improve the overall structural strength of the fixing member 23.

[0399] According to some embodiments of the present application, referring to FIG. 24, 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. That is, the first material layer 235 and the second material layer 236 are at least partially overlapped in the thickness direction X of the wall portion.

[0400] It should be noted that the first material layer 235 and the second material layer 236 can be only partially overlapped in the thickness direction X of the wall portion, for example, only the first material layer 235 and the second material layer 236 are arranged in the limiting portion 232, and the first material layer 235 and the second material layer 236 in the limiting portion 232 are arranged in the thickness direction X of the wall portion. Of course, the first material layer 235 and the second material layer 236 can also be completely overlapped in the thickness direction X of the wall portion.

[0401] In the embodiment, by arranging the first material layer 235 and the second material layer 236 to be at least partially overlapped in the thickness direction X of the wall portion, on the one hand, the connection difficulty of the first material layer 235 and the second material layer 236 is reduced, and the forming difficulty of the fixing member 23 is reduced, on the other hand, the first material layer 235 and the second material layer 236 are constrained and strengthened, which is beneficial to improve the overall structural strength of the fixing member 23.

[0402] In some embodiments, referring to FIG. 24, 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.

[0403] In the embodiment, by setting the first material layer 235 and the second material layer 236 as a completely overlapped structure in the thickness direction X of the wall portion, on 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 connection difficulty of the first material layer 235 and the second material layer 236, thereby further reducing the forming difficulty of the fixing member 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 beneficial to further improve the overall structural strength of the fixing member 23.

[0404] According to some embodiments of the present application, as shown in FIG. 24, 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. That is, the first material layer 235 and the second material layer 236 are arranged in a stacked structure along the thickness direction X of the wall portion, and the second material layer 236 is arranged to face the wall portion 211 in the thickness direction X of the wall portion.

[0405] In the embodiment, by arranging the second material layer 236 on the side of the first material layer 235 facing the wall portion 211, the structural strength of the side of the limiting portion 232 facing the wall portion 211 can be improved, so as to facilitate the assembly of the electrode terminal 24 by the fixing member 23, and improve the structural stability of the electrode terminal 24 assembled on the wall portion 211.

[0406] Of course, the structure of the battery monomer 20 is not limited to this, and in some embodiments, the battery monomer 20 can also have other structures, for example, 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 away from the wall portion 211, the first material layer 235 located in the base portion 231 is connected with the wall portion 211 to form a connection area, and the orthographic projection of the connection area and the orthographic projection of the second material layer 236 do not overlap in the same plane perpendicular to the thickness direction X of the wall portion.

[0407] Among them, the first material layer 235 located in the base portion 231 is welded with the wall portion 211 to form a welding mark, and the welding mark is a connection area formed by the mutual connection of the first material layer 235 located in the base portion 231 and the wall portion 211. Correspondingly, the projection of the welding mark formed by the welding connection of the first material layer 235 located in the base portion 231 and the wall portion 211 in the thickness direction X of the wall portion and the projection of the second material layer 236 in the thickness direction X of the wall portion do not overlap.

[0408] In the 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 projection of the connecting region formed by the mutual connection of the first material layer 235 located in the base portion 231 and the wall portion 211 in the thickness direction X of the wall portion to not overlap with the projection of the second material layer 236, the battery monomer 20 adopting the structure can on one hand improve the contact area between the first material layer 235 located in the base portion 231 and the wall portion 211, and is beneficial to improving the connection stability and reliability between the base portion 231 and the wall portion 211 of the fixing member 23, and on the other hand can reduce the covering and interference of the second material layer 236 on the connecting position between the first material layer 235 located in the base portion 231 and the wall portion 211, and is beneficial to reducing the connection difficulty between the first material layer 235 located in the base portion 231 and the wall portion 211.

[0409] According to some embodiments of the present application, please continue to refer to FIG. 24, the first material layer 235 and the second material layer 236 are stacked, and the thickness of the first material layer 235 is greater than the thickness of the second material layer 236 along the stacking direction of the first material layer 235 and the second material layer 236.

[0410] Exemplarily, the first material layer 235 and the second material layer 236 are stacked along the thickness direction X of the wall portion.

[0411] In the 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 beneficial to improve the thickness of the region of the base portion 231 for mutual connection with the wall portion 211, thereby improving the connection stability and reliability between the fixing member 23 and the wall portion 211.

[0412] According to some embodiments of the present application, the melting point of the first material layer 235 is greater than or equal to 500℃ and less than or equal to 1000℃. The melting point of the second material layer 236 is greater than or equal to 1050℃ and less than or equal to 3500℃. The melting point of the wall portion 211 is greater than or equal to 500℃ and less than or equal to 1000℃.

[0413] The melting point of the first material layer 235 can be any one of 500℃, 550℃, 600℃, 650℃, 700℃, 750℃, 800℃, 850℃, 900℃, 950℃ or 1000℃, or a range between any two of them.

[0414] 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.

[0415] The melting point of the wall portion 211 can 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.

[0416] Optionally, the melting point of the first material layer 235 can be the same as or similar to that of the wall portion 211, so as to facilitate welding of the first material layer 235 to the wall portion 211, and thus stable connection of the first material layer 235 to the wall portion 211.

[0417] In the present embodiment, the melting point of the first material layer 235 is set to be similar to or the same as that of the wall portion 211, so as to facilitate assembly connection of the first material layer 235 to the wall portion 211, and the melting point of the second material layer 236 is relatively high, thus having a good high-temperature resistance effect and being less likely to be deformed by heat.

[0418] 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 170 kgf / 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 500 kgf / mm 2 .

[0419] Optionally, the hardness of the first material layer 235 can be 30 kgf / mm 2 , 40 kgf / mm 2 , 50 kgf / mm 2 , 60 kgf / mm 2 , 70 kgf / mm 2 , 80 kgf / mm 2 , 90 kgf / mm 2 , 100 kgf / mm 2 , 110 kgf / mm 2 , 120 kgf / mm 2 , 130 kgf / mm2 140 kgf / mm 2 150 kgf / mm 2 160 kgf / mm 2 or 170 kgf / mm 2 or a range between any one of them and any other one of them.

[0420] Optionally, the hardness of the second material layer 236 can be 100 kgf / mm 2 120 kgf / mm 2 140 kgf / mm 2 160 kgf / mm 2 180 kgf / mm 2 200 kgf / mm 2 220 kgf / mm 2 240 kgf / mm 2 260 kgf / mm 2 280 kgf / mm 2 300 kgf / mm 2 320 kgf / mm 2 340 kgf / mm 2 360 kgf / mm 2 380 kgf / mm 2 400 kgf / mm 2 420 kgf / mm 2 440 kgf / mm 2 460 kgf / mm 2 480 kgf / mm 2 or 500 kgf / mm 2 or a range between any one of them and any other one of them.

[0421] In the present embodiment, by setting the hardness of the first material layer 235 to 30 kgf / mm 2 to 170 kgf / mm 2 , the first material layer 235 has better anti-deformation ability, and by setting the hardness of the second material layer 236 to 100 kgf / mm 2 to 500 kgf / mm 2 , the second material layer 236 has better anti-deformation ability relative to the first material layer 235, and the overall anti-deformation ability of the structure formed by the cooperation of 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.

[0422] According to some embodiments of the present application, referring to FIG. 24, the first material layer 235 in the base 231 is welded to the wall 211. That is, the first material layer 235 in the base 231 is welded to the wall 211 in the fixing member 23, so as to connect the fixing member 23 to the wall 211.

[0423] In the present embodiment, the first material layer 235 in the base 231 is welded to the wall 211, so as to improve the connection strength between the wall 211 and the base 231, and reduce the difficulty of connecting the first material layer 235 in the base 231 to the wall 211.

[0424] In some embodiments, the material of the first material layer 235 is the same as that of the wall 211.

[0425] It should be noted that the material of the first material layer 235 is the same as that of the wall 211, which means that the main components of the first material layer 235 are the same as those of the wall 211. For example, if the first material layer 235 and the wall 211 are single materials, such as copper or aluminum, the first material layer 235 and the wall 211 are composed of the same metal elements. If the first material layer 235 and the wall 211 are alloy materials or mixed materials, such as aluminum alloy or steel, the material of the first material layer 235 is the same as that of the wall 211, which means that the main components of the first material layer 235 are the same as those of the wall 211. If the first material layer 235 and the wall 211 only differ in the content of the components, they are still the same material.

[0426] In the present embodiment, the material of the first material layer 235 of the fixing member 23 is the same as that of the wall 211, so as to weld the base 231 and the wall 211 with the same material, thereby reducing the welding difficulty between the first material layer 235 in the base 231 and the wall 211, and reducing the welding defects between the base 231 and the wall 211, and improving the welding quality between the wall 211 and the base 231 of the fixing member 23.

[0427] According to some embodiments of the present application, referring to FIG. 24, the first material layer 235 is connected to the second material layer 236. That is, the fixing member 23 is a composite material formed by the first material layer 235 and the second material layer 236 through composite connection, that is, the fixing member 23 is formed by composite connection of two different materials, such as hot pressing or cold pressing.

[0428] In the embodiment, by setting the first material layer 235 and the second material layer 236 of the fixing member 23 as a composite connection structure, on the one hand, the connection stability and firmness between the first material layer 235 and the second material layer 236 of the fixing member 23 can be improved, and on the other hand, the forming difficulty of the fixing member 23 can be reduced, which is beneficial to improve the production efficiency of the fixing member 23.

[0429] 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.

[0430] 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.

[0431] 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.

[0432] In some embodiments, the material of the first material layer 235 can include aluminum or aluminum alloy, and correspondingly, the material of the second material layer 236 can include steel, stainless steel, copper, copper alloy, titanium or titanium alloy.

[0433] In some embodiments, the material of the first material layer 235 can include steel or stainless steel, and correspondingly, the material of the second material layer 236 can include titanium or titanium alloy.

[0434] It should be noted that the structure of the fixing member 23 is not limited to this, and in other embodiments, the second material layer 236 of the fixing member 23 can also be a non-metal material with a relatively large hardness, for example, the material of the second material layer 236 can also include ceramic, high molecular plastic, or carbon fiber reinforced composite material.

[0435] According to some embodiments of the present application, referring to FIGS. 3 and 4, the shell 21 can include a housing 212 and an end cover 213, the inside of the housing 212 forms a containing cavity with an opening 2121, and the electrode assembly 22 is contained in the containing cavity. The end cover 213 closes the opening 2121, and the end cover 213 is the wall portion 211.

[0436] The end cover 213 is the wall portion 211, that is, the fixing member 23 and the electrode terminal 24 are arranged on the end cover 213 of the shell 21, and the limiting portion 232 of the fixing member 23 is a structure for clamping and assembling the assembly portion 242 of the electrode terminal 24 in cooperation with the end cover 213 of the shell 21.

[0437] In this embodiment, by arranging the wall portion 211 of the shell 21 as the end cover 213 used to close the opening 2121 of the housing 212, the battery monomer 20 with this structure facilitates the assembly of the electrode terminal 24 to the wall portion 211 through the fixing member 23, which is conducive to reducing the assembly difficulty of the electrode terminal 24 to the wall portion 211, and facilitates the electrical connection between the electrode terminal 24 and the electrode assembly 22, which is conducive to reducing the assembly difficulty between the electrode terminal 24 and the electrode assembly 22, thereby effectively reducing the assembly difficulty of the battery monomer 20 to improve the production efficiency of the battery monomer 20.

[0438] It should be noted that the structure of the battery monomer 20 is not limited to this, and in other embodiments, the battery monomer 20 can also have other structures, for example, the shell 21 can include a housing 212 and an end cover 213, the housing 212 includes an integrally formed side wall and wall portion 211, the side wall is arranged around the wall portion 211, one end of the side wall is connected to the wall portion 211 in the thickness direction X of the wall portion, the other end of the side wall is closed to form the opening 2121, and the side wall and the wall portion 211 jointly define a containing cavity, the electrode assembly 22 is contained in the containing cavity, and the end cover 213 closes the opening 2121. That is, the fixing member 23 and the electrode terminal 24 are arranged on the bottom wall of the housing 212 opposite to the end cover 213 in the thickness direction X of the wall portion, and the limiting portion 232 of the fixing member 23 is a structure for clamping and assembling the assembly portion 242 of the electrode terminal 24 in cooperation with the bottom wall of the housing 212.

[0439] The housing 212 includes an integrally formed side wall and wall portion 211, that is, the side wall and the wall portion 211 are an integrated structure, and the side wall and the wall portion 211 of the housing 212 are structures made by an integral molding process, such as stamping or casting.

[0440] In the present embodiment, by setting the wall portion 211 of the shell 21 as one wall of the housing 212 opposite to the end cover 213 in the thickness direction X of the wall portion, the battery monomer 20 adopting such a structure can make the wall portion 211, to which the electrode terminal 24 and the fixing member 23 are assembled, 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 being able to alleviate 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, so as to reduce the risk of connection failure between the end cover 213 and the housing 212, and further to facilitate reducing the risk of liquid leakage of the battery monomer 20 in use.

[0441] According to some embodiments of the present application, the present application further provides a battery device 100, which comprises the battery monomer 20 of any one of the above solutions.

[0442] Wherein, referring to FIG. 2, the battery device 100 can further comprise a box body 10, and the battery monomer 20 is contained in the box body 10.

[0443] In some embodiments, the box body 10 can comprise a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 are mutually covered, and the first box body 11 and the second box body 12 jointly define an assembly space for containing the battery monomer 20.

[0444] 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-shaped structure, the first box body 11 is covered on the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the 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 is covered on the open side of the second box body 12.

[0445] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be various shapes, such as a cylinder or a cuboid, etc. Exemplarily, in FIG. 2, the box body 10 is a cuboid structure.

[0446] Optionally, the battery cell 20 arranged in the box 10 can be one or multiple. Exemplarily, in FIG. 2, multiple battery cells 20 are arranged in the box 10 of the battery device 100, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and the whole of the multiple battery cells 20 is accommodated in the box 10. Of course, the battery device 100 can also be that the multiple battery cells 20 are connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box 10.

[0447] The battery device 100 can further include other structures, for example, the battery device 100 can further include a busbar component connected to the multiple battery cells 20 to realize electrical connection between the multiple battery cells 20.

[0448] It should be noted that in some embodiments, the battery device 100 can also not be provided with the box 10, and the battery device 100 includes the multiple battery cells 20, and the battery device 100 composed of the multiple battery cells 20 can be directly assembled to the electric device to provide electric energy for the electric device by the multiple battery cells 20. That is, the box 10 can be part of the electric device. Taking the vehicle 1000 as an example of the electric device, the box 10 can be part of the chassis structure of the vehicle 1000, for example, part of the box 10 can be at least part of the floor of the vehicle 1000, or part of the box 10 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0449] According to some embodiments of the present application, the present application also provides an electric device, which includes the battery cell 20 of any of the above solutions, and the battery cell 20 is used to provide electric energy for the electric device.

[0450] The electric device can be any of the devices or systems to which the battery cell 20 is applied.

[0451] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0452] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, comprising: a housing having a wall portion; an electrode assembly accommodated in the housing; an electrode terminal provided to the wall portion, the electrode terminal being electrically connected to the electrode assembly; a fixing member provided to a peripheral side of the electrode terminal, the fixing member including a base portion connected to the wall portion and a limiting portion 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 thickness direction of the wall portion away from the electrode assembly; and a first insulating member at least partially provided between the electrode terminal and the limiting portion; wherein a thickness of the limiting portion is smaller than a thickness of the base portion. a portion of the electrode terminal is located between the limiting portion and the wall portion in 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 in the thickness direction of the wall portion. a surface of the limiting portion facing away from the wall portion is farther away from the wall portion than a surface of the base portion facing away from the wall portion in the thickness direction of the wall portion; wherein the fixing member further includes a connecting portion connecting the base portion and the limiting portion. the limiting portion and the base portion are spaced apart in 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 approaching the electrode terminal in a direction perpendicular to the thickness direction of the wall portion. a footprint of the connecting portion and a footprint of the electrode terminal do not overlap in a same plane perpendicular to the thickness direction of the wall portion. the connecting portion includes a curved segment connected to the base portion and a straight segment connected to the curved segment and extending from the curved segment in a direction approaching the electrode terminal in a direction perpendicular to the thickness direction of the wall portion; wherein a surface of the straight segment facing away from the wall portion is farther away from the wall portion than a surface of the base portion facing away from the wall portion in the thickness direction of the wall portion, and the limiting portion is connected to an end of the straight segment facing the electrode terminal in a direction perpendicular to 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 straight segment facing the wall portion in the thickness direction of the wall portion, so as to form a thinning groove on a side of the limiting portion facing the wall portion, and a portion of the first insulating member is accommodated in the thinning groove. a surface of the limiting portion facing away from the wall portion is closer to the wall portion than a surface of the straight segment facing away from the wall portion in the thickness direction of the wall portion, and a portion of the first insulating member is located on a side of the limiting portion facing away from 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 in the thickness direction of the wall portion. a surface of the limiting portion facing away from the wall portion is closer to the wall portion than a surface of the base portion facing away from the wall portion in the thickness direction of the wall portion, and a portion of the first insulating member is located on a side of the limiting portion facing away from the wall portion. ​ ​ ​ ​ ​ ​ ​ 2. The battery cell of claim 1, wherein, ​ 3. The battery cell of claim 2, wherein, ​ 4. The battery cell of claim 3, wherein, ​ ​ 5. The battery cell of claim 4, wherein, ​ 6. The battery cell of claim 4 or 5, wherein, ​ 7. The battery cell of any one of claims 4-6, wherein, ​ 8. The battery cell of any one of claims 4-7, wherein, ​ ​ 9. The battery cell of claim 8, wherein, ​ 10. The battery cell of claim 8 or 9, wherein, ​ 11. The battery cell of claim 3, wherein, ​ 12. The battery cell of claim 2, wherein, ​ 13. The battery cell of claim 12, wherein, The surface of the limiting portion facing the wall portion is flush with the surface of the base portion facing the wall portion along the thickness direction of the wall portion.

14. The battery cell of any one of claims 2-13, wherein, The electrode terminal comprises: The body portion is electrically connected with the electrode assembly; The assembling portion is protruded on the outer circumferential surface of the body portion, and part of the assembling portion is located between the limiting portion and the wall portion along the thickness direction of the wall portion; The limiting portion is located between the base portion and the body portion along a direction perpendicular to the thickness direction of the wall portion, and part of the first insulating member is located between the limiting portion and the outer circumferential surface of the body portion.

15. The battery cell of claim 14, wherein, The assembling portion surrounds the outside of the body portion.

16. The battery cell of claim 14 or 15, wherein, One of the body portion 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.

17. The battery cell of claim 16, wherein, The first limiting protrusion is a plurality of first limiting protrusions, and the first limiting protrusions are arranged at intervals along the circumference of the body portion. The first limiting groove is correspondingly arranged with the first limiting protrusion, and each first limiting groove is used to accommodate one first limiting protrusion.

18. The battery cell of claim 16 or 17, wherein, The first limiting protrusion is protruded on the outer circumferential surface of the body portion, and the first insulating member is provided with the first limiting groove.

19. The battery cell of claim 18, wherein, The size of the first limiting protrusion protruding from the outer circumferential surface of the body portion is smaller than the size of the assembling portion protruding from the outer circumferential surface of the body portion.

20. The battery cell of claim 18 or 19, wherein, Along the thickness direction of the wall portion, the first limiting protrusion is connected to the assembling portion, and the first limiting protrusion is located on the side of the assembling portion facing the limiting portion.

21. The battery cell of claim 20, wherein, Along the thickness direction of the wall portion, the first limiting protrusion is arranged at intervals with the limiting portion.

22. The battery cell of claim 20 or 21, wherein, 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 of any one of claims 1-22, wherein, The fixing member surrounds the electrode terminal; 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 of claim 23, wherein, The second limiting groove is a plurality of second limiting grooves, and the second limiting grooves are arranged at intervals along the circumference of the fixing member. The second limiting protrusion is correspondingly arranged with the second limiting groove, and each second limiting groove is used to accommodate one second limiting protrusion.

25. The battery cell of claim 23 or 24, wherein, 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 of claim 25, wherein, Along the thickness direction of the wall portion, the second limiting groove penetrates through both sides of the limiting portion.

27. The battery cell of any one of claims 1-26, wherein, The limiting portion surrounds the electrode terminal to form a lead-out hole. Along the thickness direction of the wall portion, the electrode terminal is arranged in 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 of any one of claims 1-27, wherein, The fixing member is separately arranged with the wall portion.

29. The battery cell of claim 28, wherein, The base portion is welded with the wall portion.

30. The battery cell of any one of claims 1-27, wherein, The fixing member is integrally formed with the wall portion.

31. The battery cell of any one of claims 1-30, wherein, The thickness of the limiting portion is D1, and the thickness of the base portion is D2, and 0.3D2≤D1≤0.8D2 is satisfied.

32. The battery cell of claim 31, wherein, 0.5mm≤D1≤1.5mm.

33. The battery cell of any one of claims 1-32, wherein, At least part of the limiting portion is embedded in the first insulating member, and part of the first insulating member is located on the side of the limiting portion away from the wall portion along the thickness direction of the wall portion.

34. The battery cell of any one of claims 1-33, wherein, A fitting groove is arranged on the side of the wall portion facing the limiting portion along the thickness direction of the wall portion, and at least part of the base portion is accommodated in the fitting groove.

35. The battery cell of claim 34, wherein, The base portion abuts against the groove bottom surface of the fitting groove, and the base portion abuts against the groove side surface of the fitting groove.

36. The battery cell of any one of claims 1-35, wherein, The fixing member surrounds the electrode terminal.

37. The battery cell of any one of claims 1-36, wherein, The base portion is connected to the side of the wall portion away from the electrode assembly along the thickness direction of the wall portion.

38. The battery cell of any one of claims 1-37, wherein, The battery monomer further comprises: A second insulating member is arranged between the wall portion and the electrode terminal along the thickness direction of the wall portion.

39. The battery cell of claim 38, wherein, The wall portion is provided with a terminal hole penetrating through the wall portion along the thickness direction of the wall portion, part of the electrode terminal extends into the terminal hole, and the part of the electrode terminal extending into the terminal hole is electrically connected with the electrode assembly; The second insulating member surrounds the terminal hole, and the second insulating member is further configured to seal the gap between the wall portion and the electrode terminal.

40. The battery cell of any one of claims 1-39, wherein, The fixing member comprises a first material layer and a second material layer connected with each other, part of the first material layer is located in the base portion, and the part of the first material layer located in the base portion is connected with the wall portion; The hardness of the second material layer is greater than that of the first material layer.

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

42. The battery cell of claim 40 or 41, wherein, Part of the second material layer is located in the base portion, and at least part of the first material layer and the second material layer located in the base portion overlap along the thickness direction of the wall portion.

43. The battery cell of any one of claims 40-42, wherein, The base portion and the limiting portion are arranged in a spaced manner along the thickness direction of the wall portion, and the fixing member further comprises a connecting portion connecting 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, and at least part of the first material layer and the second material layer located in the connecting portion overlap along the thickness direction of the wall portion.

44. The battery cell of any one of claims 40-43, wherein, At least part of the orthographic projection of the first material layer and the orthographic projection of the second material layer overlap in the same plane perpendicular to the thickness direction of the wall portion.

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

46. The battery cell of claim 44 or 45, wherein, The second material layer is located on the side of the first material layer facing the wall portion along the thickness direction of the wall portion.

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

48. The battery cell of any one of claims 40-47, wherein, The first material layer and the second material layer are arranged in a stack, and along the stacking direction of the first material layer and the second material layer, the thickness of the first material layer is greater than the thickness of the second material layer.

49. The battery cell of any one of claims 40-48, wherein, 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 part is greater than or equal to 500°C and less than or equal to 1000°C.

50. The battery cell of any one of claims 40-49, wherein, The hardness of the first material layer is greater than or equal to 30 kgf / mm 2 and less than or equal to 170 kgf / 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 500 kgf / mm 2 .

51. The battery cell of any one of claims 40-50, wherein, The first material layer located in the base part is welded to the wall part.

52. The battery cell of claim 51, wherein, The material of the first material layer is the same as the material of the wall part.

53. The battery cell of any one of claims 40-52, wherein, The first material layer and the second material layer are connected in a composite manner.

54. The battery cell of any one of claims 40-53, wherein, The base metal of the first material layer and the base metal of the second material layer are the same.

55. The battery cell of any one of claims 40-53, wherein, The material of the first material layer includes aluminum or aluminum alloy, and the material of the second material layer includes steel, stainless steel, copper, copper alloy, titanium, or titanium alloy.

56. The battery cell of any one of claims 40-53, wherein, The material of the first material layer includes steel or stainless steel, and the material of the second material layer includes titanium or titanium alloy.

57. The battery cell of any one of claims 40-53, wherein, The material of the second material layer includes ceramic, polymer plastic, or carbon fiber reinforced composite material.

58. The battery cell of any one of claims 1-57, wherein, The shell comprises: a housing, an accommodating cavity with an opening is formed inside, and the electrode assembly is accommodated in the accommodating cavity; an end cover, which closes the opening; wherein the end cover is the wall part.

59. The battery cell of any one of claims 1-57, wherein, The shell comprises: a housing, which comprises an integrally formed side wall and the wall part, the side wall is arranged around the wall part, one end of the side wall is connected to the wall part along the thickness direction of the wall part, and the other end of the side wall is closed to form an opening, the side wall and the wall part jointly define an accommodating cavity, and the electrode assembly is accommodated in the accommodating cavity; an end cover, which closes the opening.

60. A battery device comprising the battery cell of any one of claims 1-59.

61. An electric device comprising the battery cell of any one of claims 1-59, the battery cell being used to provide electric energy.

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