Battery cell, battery, and electric device

Abstract

This application provides a battery cell, a battery, and an electrical device, belonging to the field of battery technology. The battery cell includes a casing, an electrode assembly, two electrode terminals, and a first insulating member. The casing has a wall portion. The electrode assembly is housed within the casing and includes a main body and two tabs of opposite polarity, each tab being disposed at an end of the main body near the wall portion in the thickness direction. The two electrode terminals are insulatedly mounted to the wall portion and are electrically connected to the two tabs respectively. Each electrode terminal includes a connector located on the side of the wall portion opposite to the electrode assembly. The first insulating member is disposed on the side of the wall portion opposite to the electrode assembly, and the connectors for the two electrode terminals are spaced apart on the first insulating member, with at least a portion of the first insulating member located between the connector and the wall portion. This allows the two electrode terminals to share the first insulating member, optimizing the battery cell assembly process and reducing the risk of short circuits during use.

Description

Battery monomer, battery and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery monomer, a battery 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. As a core component of new energy vehicles, batteries have high requirements in terms of use reliability. Among them, the battery monomer 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 for electrically connecting with the electrode assembly is usually arranged on the shell. 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 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, comprising a shell, an electrode assembly, two electrode terminals and a first insulating piece; the shell has a wall part; the electrode assembly is contained in the shell, and the electrode assembly comprises a main body part and two polar opposite tabs, the two tabs are respectively a first tab and a second tab, and the first tab and the second tab are both arranged at one end of the main body part close to the wall part in the thickness direction of the wall part; the two electrode terminals are both insulatively mounted on the wall part, and the two electrode terminals are respectively electrically connected with the first tab and the second tab, the electrode terminal comprises a connecting piece located at one side of the wall part away from the electrode assembly, and the connecting pieces of the two electrode terminals are respectively a first connecting piece and a second connecting piece; the first insulating piece is arranged on the side of the wall part away from the electrode assembly in the thickness direction of the wall part; wherein the first connecting piece and the second connecting piece are both arranged on the first insulating piece and are arranged at intervals, and in the thickness direction of the wall part, part of the first insulating piece is located between the first connecting piece and the wall part, and part of the first insulating piece is located between the second connecting piece and the wall part.

[0006] In the technical solution, the two electrode terminals are insulatedly mounted on the wall portion, the two electrode terminals are electrically connected with the first and second tabs respectively, and the connecting members of the two electrode terminals are arranged on the first insulating member and are spaced apart, so that the two electrode terminals can cooperate to input or output the electric energy of the battery monomer. The battery monomer with the structure can realize that the first and second connecting members share the first insulating member, thereby reducing the assembly difficulty of the battery monomer, optimizing the assembly process of the battery monomer, and improving the production efficiency of the battery monomer. In addition, the shell is not electrified during use of the battery monomer, thereby relieving the insufficient creepage distance between the shell and the electrode terminal, reducing the risk of short circuit or electric leakage between the battery monomer and other components, and improving the use reliability.

[0007] In some embodiments, along the thickness direction of the wall portion, the first insulating member is provided with an assembly groove on the side away from the wall portion, and the first and second connecting members are arranged in the assembly groove.

[0008] In the technical solution, the assembly groove is arranged on the side of the first insulating member away from the wall portion, and the first and second connecting members are arranged in the assembly groove. On the one hand, the difficulty of arranging the first and second connecting members on the first insulating member is reduced, and the assembly stability between the first and second connecting members and the first insulating member is improved. On the other hand, the first and second connecting members can be accommodated in the assembly groove, thereby further improving the effect of insulating the first connecting member and the shell and the second connecting member and the shell by the first insulating member.

[0009] In some embodiments, the assembly groove is provided with a first separation portion arranged between the first and second connecting members, and the first separation portion is configured to insulate the first and second connecting members.

[0010] In the technical scheme, the first partition part is arranged in the assembly groove of the first insulating part and located between the first connecting part and the second connecting part, so that the first partition part can insulate and separate the connecting parts of the two electrode terminals. The battery monomer with the structure can realize physical separation between the first connecting part and the second connecting part arranged in the assembly groove, reduce the lap phenomenon between the first connecting part and the second connecting part in the use process of the battery monomer, and relieve the short circuit phenomenon between the first connecting part and the second connecting part caused by impurities falling between the connecting parts of the two electrode terminals. In addition, the structure can increase the creepage distance between the first connecting part and the second connecting part, and further reduce the risk of short circuit of the battery monomer in the use process.

[0011] In some embodiments, the first partition part is arranged on the groove bottom surface of the assembly groove, and opposite ends of the first partition part in a direction perpendicular to the thickness direction of the wall part are connected with the groove side surface of the assembly groove, so as to divide the assembly groove into two accommodating grooves; and the first connecting part and the second connecting part are arranged in the two accommodating grooves respectively.

[0012] In the technical scheme, the first partition part is connected with the groove bottom surface of the assembly groove, and opposite ends of the first partition part in a direction perpendicular to the thickness direction of the wall part are connected with the groove side surface of the assembly groove, so that the first partition part can divide the assembly groove of the first insulating part into two accommodating grooves for accommodating the first connecting part and the second connecting part respectively, thereby further improving the effect of insulating and separating the first connecting part and the second connecting part by the first partition part, and reducing the risk of short circuit of the first connecting part and the second connecting part in the use process.

[0013] In some embodiments, along the thickness direction of the wall part, the connecting part has a first surface away from the wall part, and the first partition part has a second surface away from the wall part; and the first surface is coplanar with the second surface, or the first surface is closer to the wall part in the thickness direction of the wall part than the second surface.

[0014] In the technical solution, the first surface of the connecting piece is arranged to be coplanar with the second surface of the first partition part, so that the side of the connecting piece away from the wall part in the thickness direction of the wall part is flush with the side of the first partition part away from the wall part in the thickness direction of the wall part, thereby improving the flatness between the connecting piece and the first partition part while improving the insulation isolation effect of the first partition part on the first connecting piece and the second connecting piece, and reducing the interference between the connecting piece or the first partition part and other components. Similarly, the first surface of the connecting piece is arranged to be closer to the wall part than the second surface of the first partition part in the thickness direction of the wall part, so that the first partition part is arranged to be beyond the side of the connecting piece away from the wall part in the thickness direction of the wall part, thereby improving the insulation isolation effect of the first partition part on the first connecting piece and the second connecting piece, and reducing the risk of short circuit of the first connecting piece and the second connecting piece during use.

[0015] In some embodiments, the first partition part is integrally formed with the first insulating piece.

[0016] In the technical solution, the first partition part and the first insulating piece are arranged to be integrally formed, thereby improving the connection stability and firmness between the first partition part and the first insulating piece, reducing the risk of falling off of the first partition part during use, and improving the stability and reliability of the insulation isolation of the first partition part on the first connecting piece and the second connecting piece.

[0017] In some embodiments, the connecting piece extends out of the assembly groove in the thickness direction of the wall part.

[0018] In the technical solution, the connecting piece is arranged to extend out of the assembly groove of the first insulating piece in the thickness direction of the wall part, so that part of the connecting piece is located in the assembly groove in the thickness direction of the wall part, and another part is located outside the assembly groove in the thickness direction of the wall part, thereby reducing the connection difficulty between the connecting piece and the busbar component during subsequent assembly of the battery monomers into a group, and improving the efficiency of the subsequent assembly of the battery monomers into a group.

[0019] In some embodiments, the minimum distance between the first connecting piece and the second connecting piece in a direction perpendicular to the thickness direction of the wall part is D1, and D1 is greater than or equal to 1.5 mm.

[0020] In the technical solution, the minimum distance between the first connecting piece and the second connecting piece in a direction perpendicular to the thickness direction of the wall part is greater than or equal to 1.5 mm, thereby increasing the creepage distance between the first connecting piece and the second connecting piece, improving the electrical clearance between the first connecting piece and the second connecting piece, and reducing the risk of lapping between the first connecting piece and the second connecting piece.

[0021] In some embodiments, a minimum distance between the first connecting member and the second connecting member in a direction perpendicular to a thickness direction of the wall portion is D1, and D1 satisfies D1≥3mm.

[0022] In the above technical solution, by further setting the minimum distance between the first connecting member and the second connecting member in the direction perpendicular to the thickness direction of the wall portion to be greater than or equal to 3mm, the creepage distance between the first connecting member and the second connecting member is further increased, so that the phenomenon of insufficient electrical gap between the first connecting member and the second connecting member when the battery monomer is used in high altitude areas can be effectively alleviated, and the phenomenon of short circuit between the first connecting member and the second connecting member caused by impurities falling between the first connecting member and the second connecting member can be effectively alleviated, thereby reducing the risk of short circuit between the first connecting member and the second connecting member.

[0023] In some embodiments, a minimum distance between the first connecting member and the second connecting member in a direction perpendicular to a thickness direction of the wall portion is D1, and D1 satisfies 4mm≤D1≤8mm.

[0024] In the above technical solution, by further setting the minimum distance between the first connecting member and the second connecting member in the direction perpendicular to the thickness direction of the wall portion to be greater than or equal to 4mm, the creepage distance between the first connecting member and the second connecting member is further increased, so that the phenomenon of insufficient electrical gap between the first connecting member and the second connecting member when the battery monomer is used in high altitude areas can be further alleviated, and the phenomenon of short circuit between the first connecting member and the second connecting member caused by impurities falling between the first connecting member and the second connecting member can be further alleviated, thereby further reducing the risk of short circuit between the first connecting member and the second connecting member. In addition, by setting the minimum distance between the first connecting member and the second connecting member in the direction perpendicular to the thickness direction of the wall portion to be less than or equal to 8mm, the phenomenon of excessive space occupied by the first connecting member and the second connecting member caused by excessive spacing between the first connecting member and the second connecting member can be alleviated, and the assembly difficulty between the first connecting member and the first insulating member and between the second connecting member and the first insulating member can be reduced.

[0025] In some embodiments, along the thickness direction of the wall portion, the connecting member has a first surface facing away from the wall portion, and an edge of the first surface includes a first edge, and the first edge is a circular arc shape.

[0026] In the above technical solution, by setting the first edge of the first surface of the connecting member to be a circular arc structure, at least part of the edge of the first surface of the connecting member is a circular arc structure, so as to improve the smoothness of the edge of the first surface of the connecting member, and to alleviate the phenomenon of collision between the connecting member and other components.

[0027] In some embodiments, a projection of the wall portion in a direction perpendicular to the thickness direction of the wall portion is circular, and the projection of the wall portion and the projection of the first edge are concentrically arranged.

[0028] In the above technical solution, by setting the projection of the wall portion in the thickness direction of the wall portion as a circle, and setting the projection of the wall portion in the thickness direction of the wall portion and the projection of the first edge in the thickness direction of the wall portion as concentrically arranged structures, the shapes of the first edge and the edge of the wall portion are matched with each other, and the battery monomer adopting such a structure can maximize the space utilization of the first surface of the connecting piece on the wall portion, which is beneficial to improve the area of the first surface of the connecting piece, so as to improve the area of the first surface of the connecting piece for connecting with the current collecting component when the battery monomer is subsequently assembled into a group, which is beneficial to improve the current carrying capacity between the connecting piece and the current collecting component.

[0029] In some embodiments, the first connecting piece and the second connecting piece are oppositely and spacedly arranged along a first direction, the first surface has a first region and a second region arranged along a second direction and connected with each other, the first direction, the second direction and the thickness direction of the wall portion are perpendicular to each other; wherein an edge of the first region includes the first edge, a projection of the second region in a plane perpendicular to the thickness direction of the wall portion is rectangular, an edge of the second region includes a second edge, and the second edge is connected with and tangent to the first edge.

[0030] In the above technical solution, the first connecting piece and the second connecting piece are oppositely and spacedly arranged along a first direction, by setting the first surface as a first region and a second region arranged along a second direction and connected with each other, and setting the second edge of the second region as connected with and tangent to the first edge of the first region, the battery monomer adopting such a structure can optimize the spatial layout of the first connecting piece and the second connecting piece on one hand, so as to improve the space utilization of the connecting piece on the wall portion, and on the other hand, can further improve the area of the first surface, so as to further improve the area of the first surface of the connecting piece for connecting with the current collecting component when the battery monomer is subsequently assembled into a group.

[0031] In some embodiments, the first region further includes a third edge, the second region further includes a fourth edge, the fourth edge is oppositely arranged with the second edge along the first direction, the third edge connects the fourth edge and the first edge, and the fourth edge and the third edge are arranged in a same line.

[0032] In the technical scheme, the fourth edge opposite to the second edge in the second area is arranged to be connected with the third edge of the first area and to be collinear with the third edge, so that the area of the first surface is increased and the regularity of the shape of the first surface is also increased, which is beneficial to reduce the manufacturing difficulty of the connecting piece of the electrode terminal, and the spatial layout of the first connecting piece and the second connecting piece can be further optimized to further improve the space utilization of the connecting piece on the wall.

[0033] In some embodiments, two mounting holes are arranged on the wall, the mounting holes penetrate through both sides of the wall along the thickness direction of the wall, and the electrode terminals correspond to the mounting holes one by one; wherein the electrode terminal further comprises a terminal body, the terminal body is arranged in the mounting hole along the thickness direction of the wall and connected with the connecting piece, and the terminal body is electrically connected with the tab.

[0034] In the technical scheme, the electrode terminal is further provided with a terminal body, the terminal body is arranged in the mounting hole of the wall along the thickness direction of the wall, one end of the terminal body is located on the side of the wall facing the electrode assembly and can be connected with the tab, and the other end of the terminal body is located on the side of the wall away from the electrode assembly and can be connected with the connecting piece, so as to realize the electrical connection between the electrode terminal and the tab of the electrode assembly, and realize the input or output of the electrical energy of the battery monomer, the structure is simple, and the assembly is convenient.

[0035] In some embodiments, two protrusions are arranged on the side of the first insulating piece facing the wall along the thickness direction of the wall, each protrusion is arranged in a corresponding mounting hole, and the protrusion is located between the terminal body and the hole wall surface of the mounting hole to insulate and isolate the wall and the terminal body.

[0036] In the technical scheme, the protrusion is arranged on the side of the first insulating piece facing the wall, the protrusion is arranged in the corresponding mounting hole along the thickness direction of the wall, and the protrusion extends between the corresponding terminal body and the hole wall surface of the mounting hole. The battery monomer with this structure can position and limit the first insulating piece on one hand, which is beneficial to improve the precision and stability of the assembly of the first insulating piece on the wall, and on the other hand, the protrusion can insulate and isolate the terminal body and the hole wall surface of the mounting hole, which is beneficial to reduce the risk of short circuit between the terminal body and the wall.

[0037] In some embodiments, the protrusion surrounds the terminal body.

[0038] In the technical solution, the protrusion is arranged in a ring structure around the outer side of the terminal body, so as to further improve the effect of insulating the protrusion from the hole wall surface of the mounting hole, and to further reduce the risk of short circuit between the terminal body and the wall portion.

[0039] In some embodiments, the battery cell further comprises two seals corresponding to the electrode terminals, the seals being arranged between the terminal body and the wall portion, and the seals being configured to seal the gap between the terminal body and the hole wall surface of the mounting hole.

[0040] In the technical solution, the seal is arranged between each terminal body and the wall portion, so that the seal can also seal the gap between the corresponding terminal body and the wall portion, thereby reducing the leakage of gas or liquid from the mounting hole of the wall portion in the housing of the battery cell, and reducing the risk of liquid leakage or gas leakage of the battery cell during use.

[0041] In some embodiments, the outer peripheral surface of the terminal body is provided with a first clamping portion, and the first clamping portion abuts against the connecting piece in the thickness direction of the wall portion to limit the connecting piece from being separated from the wall portion in a direction away from the wall portion.

[0042] In the technical solution, the first clamping portion is provided on the outer peripheral surface of the terminal body, and the first clamping portion abuts against the connecting piece in the thickness direction of the wall portion to limit the connecting piece from being separated from the wall portion in a direction away from the wall portion, thereby achieving assembly and fixation of the connecting piece on the wall portion, which is simple in structure and convenient to assemble.

[0043] In some embodiments, the connecting piece is provided with a connecting hole penetrating through the connecting piece in the thickness direction of the wall portion, the connecting hole comprising a first hole section and a second hole section arranged in the thickness direction of the wall portion, the first hole section having a larger hole diameter than the second hole section, the first hole section being located at one end of the second hole section away from the wall portion, and the hole wall surface of the first hole section and the hole wall surface of the second hole section being connected by a stepped surface; wherein the terminal body is inserted into the connecting hole in the thickness direction of the wall portion, and at least part of the first clamping portion is located in the first hole section, and the first clamping portion abuts against the stepped surface in the thickness direction of the wall portion.

[0044] In the technical scheme, the connecting hole is arranged through the connecting piece along the thickness direction of the wall portion, and the connecting hole is a stepped hole structure including a first hole section and a second hole section arranged along the thickness direction of the wall portion, so that a step surface is formed between the hole wall surface of the first hole section and the hole wall surface of the second hole section, and the terminal body is inserted into the connecting hole, and the first clamping portion is abutted on the step surface, so that the assembly between the terminal body and the connecting piece is realized, the structure is simple, the realization is convenient, and the stability is high.

[0045] In some embodiments, the connecting piece has a first surface away from the wall portion in the thickness direction of the wall portion, and the connecting hole penetrates the first surface; wherein, in the thickness direction of the wall portion, one end of the terminal body inserted into the connecting hole does not protrude from the first surface.

[0046] In the technical scheme, one end of the terminal body inserted into the connecting hole is arranged not to protrude from the first surface in the thickness direction of the wall portion, so that the one end of the terminal body inserted into the connecting hole does not extend out of the one end of the connecting hole penetrating the first surface, which can reduce the interference between the terminal body and the busbar component when the battery monomer is subsequently assembled into a group, and can reduce the phenomenon of wear or collision of the terminal body.

[0047] In some embodiments, the outer circumferential surface of the terminal body further protrudes a second clamping portion, and in the thickness direction of the wall portion, the second clamping portion is located on the side of the wall portion facing the electrode assembly, and at least part of the wall portion is located between the second clamping portion and the connecting piece.

[0048] In the technical scheme, the second clamping portion is protruded on the outer circumferential surface of the terminal body, and the second clamping portion is located on the side of the wall portion facing the electrode assembly, and at least part of the wall portion is arranged between the second clamping portion and the connecting piece, so that the second clamping portion and the connecting piece can cooperate to clamp and assemble the wall portion, so as to realize the fastening of the electrode terminal on the wall portion, thereby realizing the assembly between the electrode terminal and the wall portion, the structure is simple, the realization is convenient, and the stability is high.

[0049] In some embodiments, the battery monomer further comprises two current collecting members; both of the two current collecting members are arranged between the wall portion and the body portion, and one of the current collecting members connects one of the electrode terminals and one of the tabs.

[0050] In the technical scheme, two current collecting members are arranged between the wall portion and the body portion, and each current collecting member connects one electrode terminal and one tab, so that the difficulty of electrical connection between the tab and the electrode terminal is reduced, and the assembly efficiency of the battery monomer is improved.

[0051] In some embodiments, the battery cell further comprises a second insulating member; the second insulating member is arranged between the wall portion and the main body portion; wherein two current collecting members are arranged on the second insulating member in a spaced manner, and the second insulating member is configured to insulate and separate the two current collecting members.

[0052] In the above technical solution, by arranging the second insulating member between the wall portion and the main body portion, and arranging the two current collecting members on the second insulating member in a spaced manner, the battery cell with this structure can improve the stability of the two current collecting members arranged between the wall portion and the main body portion, which is conducive to reducing the risk of shaking of the two current collecting members during use. On the other hand, the second insulating member can insulate and separate the two current collecting members to reduce the risk of short circuit between the two current collecting members, and the two current collecting members can also share the second insulating member, which is conducive to reducing the assembly difficulty of the battery cell and optimizing the assembly process of the battery cell.

[0053] In some embodiments, part of the current collecting member is embedded in the second insulating member.

[0054] In the above technical solution, by embedding part of the current collecting member in the second insulating member, the structural stability and reliability of the current collecting member arranged on the second insulating member are improved, which is conducive to reducing the risk of short circuit between the current collecting member and other components after the current collecting member is separated from the second insulating member.

[0055] In some embodiments, the current collecting member comprises a first portion, a second portion and a third portion, the first portion and the second portion are arranged opposite to each other along the thickness direction of the wall portion, and the third portion connects the first portion and the second portion; wherein part of the first portion is embedded in the second insulating member, and the first portion is connected with the tab, and the second portion is located on the side of the second insulating member away from the main body portion in the thickness direction of the wall portion, and the second portion is connected with the electrode terminal.

[0056] In the above technical solution, the current collecting member is provided with a first portion, a second portion and a third portion, the first portion and the second portion are arranged opposite to each other along the thickness direction of the wall portion, and the third portion connects the first portion and the second portion, so that the current collecting member is in a bent structure similar to a "U" shape. By embedding the first portion in the second insulating member and connecting it with the tab, and arranging the second portion on the side of the second insulating member facing the wall portion and connecting it with the electrode terminal, the battery cell with this structure can reduce the difficulty of connecting the current collecting member with the electrode terminal and the tab, which is conducive to improving the assembly efficiency of the battery cell.

[0057] In some embodiments, the second insulating member comprises a mounting portion and a second partition portion, the first portion is embedded in the mounting portion, the second partition portion is arranged on the side of the mounting portion facing the wall portion in the thickness direction of the wall portion, and the second partition portion is located between the second portions of the two current collecting members, and the second partition portion is configured to insulate the second portions of the two current collecting members.

[0058] In the above technical solution, the second insulating member is provided with a mounting portion and a second partition portion. By embedding the first portion of the current collecting member in the mounting portion and arranging the second partition portion between the second portions of the two current collecting members, the mounting portion can not only fix and insulate the first portions of the two current collecting members, but also insulate the first portions of the two current collecting members through the second partition portion. This helps to further improve the insulation effect of the second insulating member on the two current collecting members, thereby reducing the risk of short circuit of the two current collecting members during use.

[0059] In some embodiments, the second portion is provided with a through hole penetrating through both sides of the second portion in the thickness direction of the wall portion; and the electrode terminal is arranged in the through hole in the thickness direction of the wall portion.

[0060] In the above technical solution, by arranging a through hole penetrating through the second portion in the thickness direction of the wall portion on the second portion of the current collecting member, the electrode terminal can be arranged in the through hole. This allows the second portion to be arranged outside the electrode terminal, thereby further improving the connection stability and firmness between the electrode terminal and the second portion of the current collecting member, and reducing the assembly difficulty between the electrode terminal and the second portion of the current collecting member.

[0061] In some embodiments, the battery cell further comprises a third insulating member; the third insulating member is arranged between the wall portion and the current collecting member, and the third insulating member is configured to insulate the current collecting member and the wall portion.

[0062] In the above technical solution, by arranging a third insulating member between the wall portion and the current collecting member, the third insulating member can insulate the current collecting member and the wall portion. This can reduce the lap phenomenon between the current collecting member and the wall portion, thereby reducing the risk of short circuit of the battery cell during use.

[0063] In some embodiments, the electrode assembly includes first and second polar pieces of opposite polarity, the first polar piece having a first polar piece body and a first sub-tab connected to the first polar piece body near one end of the wall portion in the thickness direction of the wall portion, the second polar piece having a second polar piece body and a second sub-tab connected to the second polar piece body near one end of the wall portion in the thickness direction of the wall portion, all of the first sub-tabs in the electrode assembly forming the first tab, all of the second sub-tabs in the electrode assembly forming the second tab, the body portion including the first polar piece body and the second polar piece body; wherein, in the thickness direction of the wall portion, the second polar piece body has a first end away from the wall portion, and the first polar piece body extends beyond the first end.

[0064] In the above technical solution, by setting the first polar piece body of the first polar piece to extend beyond the first end of the second polar piece body away from the wall portion, the density of the body portion of the electrode assembly at the end of the wall portion in the thickness direction of the wall portion is small, which on the one hand can facilitate the electrolyte in the shell to enter the body portion of the electrode assembly by capillary action, is conducive to improving the wettability of the electrolyte of the electrode assembly, to improve the use performance of the battery monomer, and on the other hand can improve the smoothness of the exhaust inside the electrode assembly when the battery monomer is in thermal runaway, which is conducive to improving the pressure relief rate of the battery monomer.

[0065] In some embodiments, in the thickness direction of the wall portion, the first polar piece body has an extension zone extending beyond the first end, the length of the extension zone being L, satisfying 1.5mm≤L≤5mm.

[0066] In the above technical solution, by setting the length of the first polar piece body of the first polar piece extending beyond the first end of the polar piece body of the second polar piece in the thickness direction of the wall portion to be 1.5mm to 5mm, on the one hand, the length of the region where the density of the body portion of the electrode assembly at the end of the wall portion in the thickness direction of the wall portion is small is greater than or equal to 1.5mm, which can improve the effect of the electrolyte in the shell entering the body portion of the electrode assembly by capillary action, to further improve the wettability of the electrolyte of the electrode assembly, and when the battery monomer is in thermal runaway, it can further improve the smoothness of the exhaust inside the electrode assembly, which is conducive to further improving the pressure relief rate of the battery monomer, and on the other hand, by setting the length of the first polar piece body of the first polar piece extending beyond the first end of the polar piece body of the second polar piece in the thickness direction of the wall portion to be less than or equal to 5mm, to alleviate the phenomenon of energy density reduction of the electrode assembly caused by excessive waste of the first polar piece.

[0067] In some embodiments, the first tab body has an overhanging region beyond the first end along the thickness direction of the wall portion, the length of the overhanging region being L, satisfying 2.5mm≤L≤5mm.

[0068] In the above technical solution, by further setting the length of the first tab body of the first tab beyond the first end of the tab body of the second tab along the thickness direction of the wall portion to be greater than or equal to 2.5mm, the length of the region where the main body portion of the electrode assembly is away from the end of the wall portion and has a small density along the thickness direction of the wall portion is greater than or equal to 2.5mm, thereby further improving the effect of the electrolyte in the shell entering the main body portion of the electrode assembly through capillary action, further improving the electrolyte wetting effect of the electrode assembly, and further improving the smoothness of the exhaust inside the electrode assembly when the battery monomer is in thermal runaway, which is beneficial to further improve the pressure relief rate of the battery monomer.

[0069] In some embodiments, the first tab is a negative tab, and the second tab is a positive tab.

[0070] In the above technical solution, by setting the first tab as a negative tab and correspondingly setting the second tab as a positive tab, the negative tab is arranged to be away from the positive tab along the thickness direction of the wall portion, thereby reducing the risk of ion metal precipitation of the electrode assembly during use, and improving the use stability and reliability of the battery monomer.

[0071] In some embodiments, the tab includes a plurality of sub-tabs, each sub-tab including a root portion, a bending portion, and a connecting portion, the root portion being connected to the main body portion, the bending portion connecting the root portion and the connecting portion, and the connecting portion being electrically connected to the electrode terminal; wherein the root portion extends along the thickness direction of the wall portion, and the extension direction of the connecting portion intersects the extension direction of the root portion.

[0072] In the above technical solution, the tab is composed of a plurality of sub-tabs, each sub-tab including a root portion, a bending portion, and a connecting portion connected in sequence, the root portion is arranged to extend along the thickness direction of the wall portion, and the extension direction of the connecting portion is arranged to intersect the extension direction of the root portion, so that the sub-tab is a locally curved structure, thereby improving the area of the connecting portion in the sub-tab for mutual connection with the electrode terminal, and improving the connection stability and current-carrying capacity between the tab and the electrode terminal.

[0073] In some embodiments, the root portion is provided with a reinforcing portion on at least one side thereof along the thickness direction.

[0074] In the technical solution, the reinforcing portion is arranged on at least one side of the root in the thickness direction of the root, so that the structural strength of the root is improved by the reinforcing portion, thereby reducing the risk of deformation or cracking of the root during use.

[0075] In some embodiments, the thickness of the reinforcing portion in the thickness direction of the root is D2, and 10um≤D2≤80um is satisfied.

[0076] In the technical solution, the thickness of the reinforcing portion in the thickness direction of the root is set to 10um to 80um. On the one hand, the thickness of the reinforcing portion in the thickness direction of the root is greater than or equal to 10um, which is beneficial to improve the structural strength of the reinforcing portion and improve the effect of the reinforcing portion reinforcing the structural strength of the root. On the other hand, the thickness of the reinforcing portion in the thickness direction of the root is less than or equal to 80um, which is beneficial to alleviate the phenomenon that the reinforcing portion occupies too much space or interferes with other components.

[0077] In some embodiments, the thickness of the reinforcing portion in the thickness direction of the root is D2, and 30um≤D2≤80um is satisfied.

[0078] In the technical solution, the thickness of the reinforcing portion in the thickness direction of the root is further set to be greater than or equal to 30um, which is beneficial to further improve the structural strength of the reinforcing portion and further improve the effect of the reinforcing portion reinforcing the structural strength of the root.

[0079] In some embodiments, the shell is cylindrical, and the central axis of the shell extends in the thickness direction of the wall portion.

[0080] In the technical solution, the shell is cylindrical, which is convenient for processing the cylindrical battery cell structure, so that the battery cell has the advantages of high capacity, long cycle life, and wide use environment temperature.

[0081] In some embodiments, the shell includes a shell body and an end cover; the shell body has an accommodating cavity with an opening formed inside, and the electrode assembly is accommodated in the accommodating cavity; and the end cover closes the opening; wherein the end cover is the wall portion.

[0082] In the technical solution, the wall portion of the shell is set as the end cover for closing the opening of the shell. The battery cell with this structure is convenient for assembling the electrode terminal and the first insulating piece on the end cover, and can reduce the difficulty of electrical connection between the electrode terminal and the tab, thereby reducing the manufacturing difficulty of the battery cell and improving the production efficiency of the battery cell.

[0083] In some embodiments, the shell comprises a shell body and an end cover; the shell body comprises an integrally formed side wall and a bottom wall, the side wall being arranged around the bottom wall, one end of the side wall being connected to the bottom wall, and the other end of the side wall being arranged to form an opening, the side wall and the bottom wall together defining a receiving cavity, and the electrode assembly being received in the receiving cavity; and the end cover is arranged to close the opening; wherein the bottom wall is the wall portion.

[0084] In the above technical solution, by arranging the wall portion of the shell as the bottom wall opposite to the end cover, the wall portion provided with the electrode terminal can be arranged away from the end cover, so that the phenomenon that the stress generated by the pulling or twisting of the electrode terminal by other components is transmitted to the connection position of the end cover and the shell body can be alleviated, and thus the risk of connection failure of the end cover and the shell body can be reduced, so as to improve the use stability and reliability of the battery monomer.

[0085] In a second aspect, the embodiments of the present application further provide a battery comprising the battery monomer described above.

[0086] In a third aspect, the embodiments of the present application further provide a power consumption device comprising the battery monomer described above, and the battery monomer is used to provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0087] 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 embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0088] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0089] FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

[0090] FIG. 3 is a structural schematic diagram of a battery monomer according to some embodiments of the present application;

[0091] FIG. 4 is an exploded view of a battery monomer according to some embodiments of the present application;

[0092] FIG. 5 is a sectional view of a battery monomer according to some embodiments of the present application;

[0093] FIG. 6 is a partial sectional view of a battery monomer according to some embodiments of the present application;

[0094] FIG. 7 is a front view of a battery monomer according to some embodiments of the present application, which is in the thickness direction of the wall portion and faces the wall portion;

[0095] Figure 8 is a partial cross-sectional view of an electrode assembly according to some embodiments of the present application;

[0096] Figure 9 is a structural schematic diagram of a first tab of an electrode assembly according to some embodiments of the present application in an unfolded state;

[0097] Figure 10 is a cross-sectional view of the first tab of the electrode assembly according to some embodiments of the present application;

[0098] Figure 11 is a partial structural exploded view of a battery cell according to some embodiments of the present application;

[0099] Figure 12 is a structural schematic diagram of a first insulating member of a battery cell according to some embodiments of the present application;

[0100] Figure 13 is a cross-sectional view of an electrode terminal of a battery cell according to some embodiments of the present application;

[0101] Figure 14 is an assembly schematic diagram of a second insulating member and a current collecting member of a battery cell according to some embodiments of the present application.

[0102] Icon: 1000-vehicle; 100-battery; 10-box body; 11-first box body; 12-second box body; 20-battery cell; 21-outer shell; 211-wall part; 2111-mounting hole; 212-housing; 2121-opening; 213-end cover; 22-electrode assembly; 221-main body part; 222-tab; 222a-first tab; 222b-second tab; 2221-sub-tab; 2221a-root part; 2221b-bent part; 2221c-connection part; 2221d-strengthening part; 223-first pole piece; 2231-first pole piece main body; 2231a-excess area; 2232-first sub-tab; 224-separator; 225-second pole piece; 2251-second pole piece main body; 2251a-first end; 2252-second sub-tab; 23-electrode terminal; 231-connection piece; 231a-first connection piece; 231b-second connection piece; 2311-first surface; 23111-first area; 23111a-first edge; 23111b-third edge; 23112-second area; 23112a-second edge; 23112b-fourth edge; 23112c-fifth edge; 2312-connection hole; 2312a-first hole section; 2312b-second hole section; 2312c-step surface; 232-terminal main body; 2321-first clamping part; 2322-second clamping part; 24-first insulating piece; 241-fitting groove; 2411-receiving groove; 242-first separation part; 2421-second surface; 243-protrusion; 25-current collecting member; 251-first part; 252-second part; 2521-through hole; 253-third part; 26-sealing piece; 27-second insulating piece; 271-mounting part; 272-second separation part; 28-third insulating piece; 200-controller; 300-motor; X-thickness direction of wall part; Y-first direction; Z-second direction. DETAILED DESCRIPTION

[0103] 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 clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0104] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as 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 particular embodiments only and is not intended to be limiting of the application. The articles 'a', 'an', and 'the' each followed by'some or more' or 'one or more' of an element are intended to include one or more articles of the described element and do not exclude other additional elements. The terms "comprises", "comprising", "includes", "including", "has", "having" and the like are inclusive and are used as equivalents of the term "consisting of".

[0105] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0106] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection", "attaching" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; 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.

[0107] The term "and / or" in the application is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the application generally represents that the front and rear associated objects have an "or" relationship.

[0108] 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.

[0109] "Multiple" appearing in the application means more than two (including two).

[0110] 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 to continue to use.

[0111] 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.

[0112] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from shorting to some extent, while allowing the active ions to pass through.

[0113] 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.

[0114] 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.

[0115] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a 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 polymer 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 polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0116] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination with two or more. Among them, examples of lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP for short)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of lithium transition metal oxides can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn1 / 3 O2(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.

[0117] 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 the positive electrode active material, or of course can be provided with the 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.

[0118] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0119] 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 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 polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0120] 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.

[0121] 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.

[0122] 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.

[0123] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0124] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0133] 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.

[0134] 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.

[0135] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0136] 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.

[0137] In some embodiments, the electrode assembly is in a stacked structure.

[0138] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0139] 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.

[0140] As an example, the positive electrode sheet and the negative electrode sheet are each folded to form a plurality of folded segments that are stacked.

[0141] As an example, the separator can be provided in plurality, and each of the plurality of separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0142] As an example, the separator can be provided in plurality, and each of the plurality of separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0143] In some embodiments, the electrode assembly can have a shape of a cylinder, a flat, a polygonal prism, or the like.

[0144] In some embodiments, the electrode assembly can be provided with tabs, which can lead current out of the electrode assembly. The tabs can include positive tabs and negative tabs.

[0145] 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 (e.g., polypropylene), a composite metal case (e.g., a copper-aluminum composite case), an aluminum-plastic film, or the like.

[0146] 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 polygonal prism battery cell (e.g., a hexagonal prism battery cell), or the like.

[0147] The battery referred to in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

[0148] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0149] In some embodiments, the battery can be a battery pack, and the battery pack can include a box and battery cells or battery modules, which are accommodated in the box.

[0150] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, part of the box can be at least part of a floor of the vehicle, or part of the box can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0151] In some embodiments, the battery can be an energy storage device. The energy storage device can include an energy storage container, an energy storage cabinet, or the like.

[0152] The battery has the advantages of high energy density, small environmental pollution, large power density, long service life, wide adaptation range, small self-discharge coefficient and the like, and is an important part of the development of new energy at present. 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, and in addition, the reliability of the battery also needs to be considered.

[0153] For a general battery monomer, the battery monomer usually includes a shell and an electrode assembly contained in the shell, the shell includes an end cover and an integrally formed shell body, the end cover covers one end of the shell body, and the electrode assembly is usually provided with two tabs, namely a positive tab and a negative tab, the two tabs are used to cooperate with the output or input of the electric energy of the electrode assembly, in order to save the space occupied by the electrode assembly in the shell and improve the energy density of the battery monomer, especially in the battery monomer with a cylindrical structure, in the related art, the two tabs of the electrode assembly are usually arranged at the same end of the electrode assembly, and the electrode terminal is insulatively mounted on the end cover, so that one of the positive tab and the negative tab of the electrode assembly is electrically connected with the electrode terminal, and the other is electrically connected with the shell, so as to cooperate with the input or output of the electric energy of the battery monomer through the shell and the electrode terminal, but in the battery monomer with such a structure, the shell will be charged, on the one hand, it will cause the battery monomer to be easily short-circuited or leaked with other components during use, on the other hand, it will cause the creepage distance between the shell and the electrode terminal with opposite charges to be short, which cannot meet the electrical clearance between the shell and the electrode terminal, especially in the case of use in high altitude areas or in the case of particle falling between the shell and the electrode terminal during production, the short circuit phenomenon between the shell and the electrode terminal of the battery monomer is extremely easy to occur, thereby causing a certain use risk of the battery monomer during use, which is not conducive to improving the use reliability of the battery monomer.

[0154] In view of the above, in order to solve the problem of low use reliability of the battery monomer, the application provides a battery monomer, which comprises a shell, an electrode assembly, two electrode terminals and a first insulating piece. The shell has a wall portion. The electrode assembly is accommodated in the shell and comprises a main body portion and two polar opposite tabs, i.e., a first tab and a second tab, which are arranged at one end of the main body portion close to the wall portion in the thickness direction of the wall portion. The two electrode terminals are both insulatedly mounted on the wall portion and are electrically connected to the first tab and the second tab, respectively. The electrode terminals comprise connecting pieces on the side of the wall portion away from the electrode assembly, and the connecting pieces of the two electrode terminals are a first connecting piece and a second connecting piece, respectively. The first insulating piece is arranged on the side of the wall portion away from the electrode assembly in the thickness direction of the wall portion. The first connecting piece and the second connecting piece are both arranged on the first insulating piece and are spaced apart, and in the thickness direction of the wall portion, part of the first insulating piece is located between the first connecting piece and the wall portion, and part of the first insulating piece is located between the second connecting piece and the wall portion.

[0155] In the battery monomer with the above structure, the two electrode terminals are both insulatedly mounted on the wall portion, the two electrode terminals are electrically connected to the first tab and the second tab, respectively, and the connecting pieces of the two electrode terminals are both arranged on the first insulating piece and are spaced apart, so that the battery monomer can cooperate with the two electrode terminals to input or output electric energy. On the one hand, the battery monomer with the above structure can realize that the first connecting piece and the second connecting piece share the first insulating piece, thereby reducing the assembly difficulty of the battery monomer, optimizing the assembly process of the battery monomer, and improving the production efficiency of the battery monomer. On the other hand, the shell is not electrified during use of the battery monomer, thereby relieving the insufficient creepage distance between the shell and the electrode terminals, reducing the risk of short circuit or electric leakage between the battery monomer and other components, and separating the first connecting piece and the second connecting piece while insulating the first connecting piece and the second connecting piece from the wall portion by the first insulating piece, thereby reducing the short circuit risk between the first connecting piece and the second connecting piece and improving the use reliability.

[0156] The battery monomer disclosed in the application can be used in an electric device such as a vehicle, a ship or an aircraft, etc. The power supply system of the electric device can be composed of the battery monomer and a battery disclosed in the application, so as to relieve the problem of short circuit and electric leakage of the battery monomer during use and improve the use reliability of the battery monomer.

[0157] The embodiments of the present application provide a power consumption device using a battery as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft and the like. 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 and the like. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft and the like.

[0158] The following embodiments are described by taking a power consumption device as a vehicle in an embodiment of the present application as an example for convenience of description.

[0159] 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. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile. The vehicle 1000 is internally provided with a battery 100. The battery 100 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 100 can be used to supply power for the vehicle 1000, for example, the battery 100 can be used as an operating power supply or a use power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power for the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0160] In some embodiments of the present application, the battery 100 can not only be used as an operating power supply or a use power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0161] Please refer to FIG. 2 and FIG. 3. FIG. 2 is an exploded structural diagram of the battery 100 provided by some embodiments of the present application. FIG. 3 is a structural schematic diagram of a battery monomer 20 provided by some embodiments of the present application. The battery 100 includes a box body 10 and the battery monomer 20. The battery monomer 20 is used to be accommodated in the box body 10.

[0162] The box 10 is configured to provide an assembly space for the battery cell 20. The box 10 can have various structures. In some embodiments, the box 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 coupled to each other to 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 structure. The first box body 11 is coupled to the open end of the second box body 12 to define the assembly space together with the second box body 12. Alternatively, the first box body 11 and the second box body 12 can both be hollow structures with one end open. The open end of the first box body 11 is coupled to the open end of the second box body 12.

[0163] The box 10 formed by the first box body 11 and the second box body 12 can have various shapes, such as a cylinder, a cuboid, a square, etc. For example, as shown in FIG. 2, the box 10 has a cuboid shape.

[0164] In the battery 100, the battery cell 20 disposed in the box 10 can be one or a plurality of battery cells. When the battery cell 20 disposed in the box 10 is a plurality of battery cells, the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the plurality of battery cells 20 can be accommodated in the box 10. Alternatively, the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed connection to form a battery module, and then a plurality of battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box 10.

[0165] In some embodiments, the battery 100 can further include other structures. For example, the battery 100 can further include a busbar member configured to connect the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20.

[0166] Each of the battery cells 20 can be a secondary battery or a primary battery, and can 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, as shown in FIG. 3, the battery cell 20 has a cylindrical shape.

[0167] According to some embodiments of the present application, referring to FIG. 3, and further referring to FIG. 4, FIG. 5, FIG. 6 and FIG. 7, FIG. 4 is an exploded view of a structure of a battery cell 20 according to some embodiments of the present application, FIG. 5 is a sectional view of the battery cell 20 according to some embodiments of the present application, FIG. 6 is a front view of the battery cell 20 according to some embodiments of the present application, facing the wall portion 211 in the thickness direction X of the wall portion, and FIG. 7 is a front view of the battery cell 20 according to some embodiments of the present application, facing the wall portion 211 in the thickness direction X of the wall portion. The present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, two electrode terminals 23 and a first insulating member 24. The housing 21 has a wall portion 211. The electrode assembly 22 is accommodated in the housing 21, and the electrode assembly 22 includes a main body portion 221 and two tabs 222 of opposite polarity, which are a first tab 222a and a second tab 222b respectively, and both of which are arranged at one end of the main body portion 221 close to the wall portion 211 in the thickness direction X of the wall portion. Both of the two electrode terminals 23 are insulatively mounted on the wall portion 211, and both of the two electrode terminals 23 are electrically connected to the first tab 222a and the second tab 222b respectively. The electrode terminal 23 includes a connecting piece 231 located on the side of the wall portion 211 away from the electrode assembly 22, and the connecting pieces 231 of the two electrode terminals 23 are the first connecting piece 231a and the second connecting piece 231b respectively. The first insulating member 24 is arranged on the side of the wall portion 211 away from the electrode assembly 22 in the thickness direction X of the wall portion, and both of the first connecting piece 231a and the second connecting piece 231b are arranged on the first insulating member 24 and are spaced apart. In the thickness direction X of the wall portion, part of the first insulating member 24 is located between the first connecting piece 231a and the wall portion 211, and part of the first insulating member 24 is located between the second connecting piece 231b and the wall portion 211.

[0168] The housing 21 can also be used to accommodate electrolyte, such as electrolyte solution, etc. The material of the housing 21 can also be various, such as copper, iron, aluminum, steel or aluminum alloy, etc.

[0169] In some embodiments, the housing 21 can be a sealed structure, or can be a non-sealed structure. As an example, when the housing 21 is a sealed structure, the housing 21 can play a role in protecting the electrode assembly 22 and preventing electrolyte leakage to some extent. When the housing 21 is a non-sealed structure, the housing 21 can play a role in protecting the electrode assembly 22, and a sealing bag can be further included between the housing 21 and the electrode assembly 22, which is used to package the electrode assembly 22 and electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum plastic film.

[0170] Optionally, the shell 21 can include a shell body 212 and an end cover 213, the shell body 212 has an inner portion formed with a receiving cavity for receiving the electrode assembly 22, and the receiving cavity has an opening 2121, that is, the shell body 212 is a hollow structure with one end open at the opening 2121, and the end cover 213 is attached to the opening 2121 of the shell body 212 and forms a sealed connection to form a sealed space for receiving the electrode assembly 22 and the electrolyte.

[0171] In the assembly of the battery cell 20, the electrode assembly 22 can be first placed in the shell body 212, and the electrolyte is filled into the shell body 212, and then the end cover 213 is attached to the opening 2121 of the shell body 212 to complete the assembly of the battery cell 20.

[0172] The shell body 212 can have various shapes, such as a cylindrical structure or a prismatic structure, 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 a cylindrical structure, a cylindrical shell body 212 can be selected. Of course, the structure of the end cover 213 can also be various, such as a plate-like structure or a hollow structure with one end open, etc. Exemplarily, in FIGS. 3 and 4, the shell body 212 is a cylindrical structure, the central axis of the shell body 212 extends along the thickness direction X of the wall portion, and the end cover 213 is a plate-like structure, and the orthogonal projection of the end cover 213 in the plane perpendicular to the thickness direction X of the wall portion is circular.

[0173] It should be noted that the wall portion 211 for mounting the electrode terminal 23 can be the end cover 213 of the shell 21, or a wall of the shell body 212. Exemplarily, in FIGS. 3 and 4, the wall portion 211 is the end cover 213 of the shell 21. Of course, the structure of the battery cell 20 is not limited thereto, and in other embodiments, the shell body 212 can include a side wall and a bottom wall, the side wall is arranged around the bottom wall, the bottom wall is arranged opposite to the end cover 213 along the thickness direction X of the wall portion, one end of the side wall is connected to the bottom wall, and the other end of the side wall is closed to form the opening 2121, and the bottom wall can also be the wall portion 211 for mounting the electrode terminal 23.

[0174] The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. Referring to FIGS. 4 and 5, and further referring to FIGS. 8, 9 and 10, FIG. 8 is a partial cross-sectional view of the electrode assembly 22 provided by some embodiments of the present application, FIG. 9 is a structure schematic view of the first electrode tab 223 of the electrode assembly 22 after being unfolded, and FIG. 10 is a cross-sectional view of the first electrode tab 223 of the electrode assembly 22. The electrode assembly 22 can include a first electrode tab 223, a separator 224 and a second electrode tab 225, the first electrode tab 223 and the second electrode tab 225 have opposite polarities, and the separator 224 is arranged between the first electrode tab 223 and the second electrode tab 225 to separate the first electrode tab 223 and the second electrode tab 225.

[0175] Optionally, the structure of the electrode assembly 22 can be various, and the electrode assembly 22 can be a winding structure formed by winding the first tab 223, the separator 224 and the second tab 225, or can be a laminated structure formed by laminating the first tab 223, the separator 224 and the second tab 225. Illustratively, the electrode assembly 22 is a winding structure formed by winding the first tab 223, the separator 224 and the second tab 225, and the main body part 221 of the electrode assembly 22 is in a cylindrical shape, and the central axis of the main body part 221 extends along the thickness direction X of the wall part.

[0176] Illustratively, the separator 224 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.

[0177] In the first tab 223, the first tab main body 2231 and the plurality of first sub-tabs 2232 are connected to one end of the first tab main body 2231 close to the wall part 211 in the thickness direction X of the wall part, and in the second tab 225, the second tab main body 2251 and the plurality of second sub-tabs 2252 are connected to one end of the second tab main body 2251 close to the wall part 211 in the thickness direction X of the wall part. The plurality of first sub-tabs 2232 form the first tab 222a of the electrode assembly 22, and the plurality of second sub-tabs 2252 form the second tab 222b of the electrode assembly 22. That is, each of the tabs 222 of the electrode assembly 22 includes a plurality of sub-tabs 2221, and the first sub-tab 2232 is a sub-tab 2221 of the first tab 222a of the electrode assembly 22, and the second sub-tab 2252 is a sub-tab 2221 of the second tab 222b of the electrode assembly 22. Thus, the electrode assembly 22 is formed with two tabs 222 having opposite polarities, i.e., the first tab 222a and the second tab 222b, so that the first tab 222a and the second tab 222b respectively input or output the positive and negative electrodes of the electrode assembly 22.

[0178] The main body part 221 is a region where the electrode assembly 22 chemically reacts within the battery cell 20. The main body part 221 is a structure in which the first tab main body 2231 of the first electrode tab 223, the separator 224, and the second tab main body 2251 of the second electrode tab 225 are wound such that the plurality of first sub-electrode tabs 2232 of the first electrode tab 223 are located at one end of the main body part 221 in the thickness direction X of the wall part 211 and form the first electrode tab 222a connected to the one end of the main body part 221, and such that the plurality of second sub-electrode tabs 2252 of the second electrode tab 225 are located at the one end of the main body part 221 in the thickness direction X of the wall part 211 and form the second electrode tab 222b connected to the one end of the main body part 221, so that the first electrode tab 222a and the second electrode tab 222b having opposite polarities in the electrode assembly 22 are both disposed at the same end of the main body part 221 in the thickness direction X of the wall part 211 and face the one end of the main body part 221 in the thickness direction X of the wall part 211.

[0179] In the embodiment of the present application, the first electrode tab 223 includes a first current collector and a first coating layer disposed on at least one side of the first current collector, and the first sub-electrode tab 2232 is a part of a region of the first current collector cut out and not provided with the first coating layer. Similarly, the second electrode tab 225 includes a second current collector and a second coating layer disposed on at least one side of the second current collector, and the second sub-electrode tab 2252 is a part of a region of the second current collector cut out and not provided with the second coating layer.

[0180] Alternatively, the first electrode tab 223 can be a negative electrode tab, and correspondingly, the second electrode tab 225 is a positive electrode tab. Of course, the first electrode tab 223 can also be a positive electrode tab, and correspondingly, the second electrode tab 225 is a negative electrode tab. Exemplarily, the first electrode tab 223 is a negative electrode tab, and the first coating layer can be a negative active material layer as a whole. Of course, in other embodiments, the first coating layer can also include a negative active material layer and a first insulating layer disposed on an edge of the negative active material layer at the one end of the wall part in the thickness direction X of the wall part 211. Correspondingly, the second electrode tab 225 is a positive electrode tab, and the second coating layer includes a positive active material layer and a second insulating layer disposed on an edge of the positive active material layer at the one end of the wall part in the thickness direction X of the wall part 211. Of course, in other embodiments, the second coating layer can also be a positive active material layer as a whole.

[0181] The electrode terminal 23 serves to output or input the electric energy of the battery monomer 20, and can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. Two electrode terminals 23 are arranged on the wall portion 211, and are electrically connected to the first and second tabs 222a and 222b, respectively, to input or output the positive and negative electrodes of the battery monomer 20 through the two electrode terminals 23.

[0182] Both of the electrode terminals 23 are insulatively mounted on the wall portion 211, that is, no electrical connection is formed between the two electrode terminals 23 and the wall portion 211. In some embodiments, referring to FIG. 6 and further referring to FIG. 11, which is an exploded view of a partial structure of the battery monomer 20 according to some embodiments of the present application, two mounting holes 2111 are arranged on the wall portion 211, and the mounting holes 2111 penetrate through both sides of the wall portion 211 along the thickness direction X of the wall portion. One electrode terminal 23 is arranged in one mounting hole 2111 along the thickness direction X of the wall portion, and both ends of the electrode terminal 23 in the thickness direction X of the wall portion extend out of the mounting hole 2111, so that both ends of the electrode terminal 23 in the thickness direction X of the wall portion protrude from both sides of the wall portion 211. Thus, one end of the electrode terminal 23 in the thickness direction X of the wall portion facing the electrode assembly 22 can be electrically connected to one tab 222, and the other end can be electrically connected to the busbar component of the battery 100.

[0183] The electrode terminal 23 includes a connecting piece 231 on the side of the wall portion 211 away from the electrode assembly 22, that is, the electrode terminal 23 includes the connecting piece 231, and the connecting piece 231 is on the side of the wall portion 211 away from the electrode assembly 22 in the thickness direction X of the wall portion. The connecting piece 231 is a component of the electrode terminal 23 for connecting to the busbar component, that is, the electrode terminal 23 has the connecting piece 231 for connecting to the busbar component, and the connecting piece 231 is on the side of the wall portion 211 away from the electrode assembly 22 in the thickness direction X of the wall portion. The surface of the connecting piece 231 on the side of the wall portion 211 away from the wall portion 211 in the thickness direction X of the wall portion is a first surface 2311 for connecting to the busbar component.

[0184] The electrode terminal 23 further includes a terminal body 232, which is arranged in the mounting hole 2111 along the thickness direction X of the wall portion, and both ends of the terminal body 232 in the thickness direction X of the wall portion extend out of the surfaces of both sides of the wall portion 211. One end of the terminal body 232 in the thickness direction X of the wall portion close to the electrode assembly 22 is used for electrically connecting to the tab 222, and the other end is connected to the connecting piece 231. Optionally, the connecting structure between the terminal body 232 and the connecting piece 231 can be various, such as clamping, riveting, or welding connection.

[0185] The first insulation member 24 serves to insulate and separate the connecting member 231 of the electrode terminal 23 and the wall portion 211, and the material of the first insulation member 24 can be various, for example, the material of the first insulation member 24 can be at least one of polypropylene, polyimide, ceramic, and other solid insulation materials, or one of mica, powdered mica, mica products, glass, glass fiber and products thereof, and non-polar solid materials such as electric porcelain and alumina film. Among them, the first insulation member 24 has a comparative tracking index CTI greater than or equal to 175.

[0186] The first insulation member 24 is arranged on the side of the wall portion 211 away from the electrode assembly 22, and the first connecting member 231a and the second connecting member 231b are both arranged on the first insulation member 24 and spaced apart, that is, the first connecting member 231a and the second connecting member 231b are arranged on the first insulation member 24 and spaced apart, so that part of the first insulation member 24 is located between the first connecting member 231a and the wall portion 211, and part of the first insulation member 24 is located between the second connecting member 231b and the wall portion 211, so that the first insulation member 24 is configured to insulate and separate the wall portion 211 and the first connecting member 231a, and the wall portion 211 and the second connecting member 231b, and the first insulation member 24 can also provide assembly space for the first connecting member 231a and the second connecting member 231b, so that the first connecting member 231a and the second connecting member 231b are spaced apart from each other to form an electrical gap between the first connecting member 231a and the second connecting member 231b.

[0187] Optionally, the tab 222 and the electrode terminal 23 can be directly connected, such as abutting or welding connection, and the tab 222 and the electrode terminal 23 can also be indirectly connected through other components, for example, in FIGS. 6 and 11, the battery monomer 20 can also include two current collecting members 25, both of which are arranged between the wall portion 211 and the electrode assembly 22, and each current collecting member 25 connects one tab 222 and one terminal body 232 of the electrode terminal 23. Optionally, the connection structure between the current collecting member 25 and the tab 222 and the connection structure between the current collecting member 25 and the terminal body 232 of the electrode terminal 23 can be various, such as abutting or welding connection.

[0188] In some embodiments, the battery monomer 20 can also include a pressure relief component arranged on the shell 21, and the pressure relief component 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.

[0189] Optionally, the pressure relief component can be arranged on the end cover 213 of the shell 21, or arranged on the shell body 212 of the shell 21. Similarly, the pressure relief component and the shell 21 can be an integrally formed structure, or a separately arranged structure. If the pressure relief component and the shell 21 are a separately arranged structure, i.e. a split structure, the pressure relief component can be connected to the shell 21 by welding or the like, and the pressure relief component can be a component such as a rupture disc, a rupture plate, a gas valve, a pressure relief valve, or a safety valve. If the pressure relief component and the shell 21 are an integrally formed structure, i.e. a unitary structure, the pressure relief component is a region of the shell 21 that has a weak structure, for example, the pressure relief component is a region of the shell 21 that is provided with a pressure relief groove.

[0190] In the present embodiment, the two electrode terminals 23 are both insulatively mounted on the wall portion 211, and the two electrode terminals 23 are respectively electrically connected to the first tab 222a and the second tab 222b. The first connecting member 231a and the second connecting member 231b are both arranged on the first insulating member 24 and are spaced apart, so that the two electrode terminals 23 can cooperate to input or output the electrical energy of the battery monomer 20. The battery monomer 20 adopting this structure can have the following advantages. On the one hand, the first connecting member 231a and the second connecting member 231b can share the first insulating member 24, thereby reducing the assembly difficulty of the battery monomer 20, optimizing the assembly process of the battery monomer 20, and improving the production efficiency of the battery monomer 20. On the other hand, the shell 21 can be uncharged during use of the battery monomer 20, thereby alleviating the insufficient creepage distance between the shell 21 and the electrode terminals 23, reducing the risk of short circuit or electric leakage between the battery monomer 20 and other components, and improving the use reliability.

[0191] According to some embodiments of the present application, referring to FIGS. 6, 7 and 11, and further referring to FIG. 12, which is a structural schematic view of the first insulating member 24 of the battery monomer 20 according to some embodiments of the present application. Along the thickness direction X of the wall portion, the first insulating member 24 is provided with an assembly groove 241 on the side away from the wall portion 211, and the first connecting member 231a and the second connecting member 231b are spaced apart and arranged in the assembly groove 241.

[0192] The first insulating piece 24 is provided with an assembly groove 241 on the side away from the wall portion 211, that is, the surface of the first insulating piece 24 on the side away from the wall portion 211 in the thickness direction X of the wall portion is provided with the assembly groove 241, and the groove opening of the assembly groove 241 is located on the side of the first insulating piece 24 away from the wall portion 211, so that the groove side wall of the assembly groove 241 surrounds the connecting piece 231, and the groove bottom wall of the assembly groove 241 is located between the connecting piece 231 and the wall portion 211.

[0193] The first connecting piece 231a and the second connecting piece 231b are arranged in the assembly groove 241, that is, the first connecting piece 231a and the second connecting piece 231b are arranged in the assembly groove 241, and the first connecting piece 231a and the second connecting piece 231b are arranged in the assembly groove 241. For example, in FIGS. 6 and 7, the first connecting piece 231a and the second connecting piece 231b are arranged in the assembly groove 241 in the first direction Y.

[0194] In this embodiment, by arranging the assembly groove 241 on the side of the first insulating piece 24 away from the wall portion 211, and arranging the first connecting piece 231a and the second connecting piece 231b in the assembly groove 241, on the one hand, the difficulty of arranging the first connecting piece 231a and the second connecting piece 231b on the first insulating piece 24 can be reduced, and the assembly stability between the first connecting piece 231a and the first insulating piece 24 and between the second connecting piece 231b and the first insulating piece 24 can be improved. On the other hand, the connecting piece 231 can be accommodated in the assembly groove 241, which is conducive to further improving the effect of insulating and isolating the first connecting piece 231a and the second connecting piece 231b from the shell 21 by the first insulating piece 24.

[0195] According to some embodiments of the present application, referring to FIGS. 6, 7 and 12, the assembly groove 241 is provided with a first partition portion 242, the first partition portion 242 is arranged between the first connecting piece 231a and the second connecting piece 231b, and the first partition portion 242 is configured to insulate and isolate the first connecting piece 231a and the second connecting piece 231b.

[0196] The first partition portion 242 insulates and isolates the first connecting piece 231a and the second connecting piece 231b, and the material of the first partition portion 242 can be rubber, silicone or plastic.

[0197] The first partition portion 242 is arranged in the assembly groove 241, that is, at least a part of the first partition portion 242 is arranged in the assembly groove 241. The first partition portion 242 can be connected to the bottom surface of the assembly groove 241, or connected to the side surface of the assembly groove 241, or connected to both the bottom surface and the side surface of the assembly groove 241. In the example shown in FIG. 12, the first partition portion 242 is arranged on the bottom surface of the assembly groove 241, and both ends of the first partition portion 242 in the extending direction are connected to the side surface of the assembly groove 241.

[0198] Similarly, the first partition portion 242 and the first insulating member 24 can be integrally formed. For example, the first partition portion 242 and the first insulating member 24 can be integrally formed by injection molding or milling. Alternatively, the first partition portion 242 and the first insulating member 24 can be separately arranged. The first partition portion 242 can be connected to the assembly groove 241 of the first insulating member 24 by bonding or clamping.

[0199] The first partition portion 242 is arranged between the first connecting member 231a and the second connecting member 231b. That is, in the arrangement direction of the first connecting member 231a and the second connecting member 231b, the first partition portion 242 is arranged between the first connecting member 231a and the second connecting member 231b. In the example shown in FIGS. 6 and 7, the first connecting member 231a and the second connecting member 231b are arranged in the first direction Y, so that the first partition portion 242 is arranged between the first connecting member 231a and the second connecting member 231b in the first direction Y. The extending direction of the first partition portion 242 is the second direction Z, and the first direction Y, the second direction Z, and the thickness direction X of the wall portion are perpendicular to each other.

[0200] In this embodiment, by arranging the first partition portion 242 in the assembly groove 241 of the first insulating member 24 and arranging the first partition portion 242 between the first connecting member 231a and the second connecting member 231b, the first partition portion 242 can insulate and separate the first connecting member 231a and the second connecting member 231b. The battery monomer 20 with this structure can achieve physical separation between the first connecting member 231a and the second connecting member 231b arranged in the assembly groove 241, which can reduce the overlap between the first connecting member 231a and the second connecting member 231b during use of the battery monomer 20, and can alleviate the short circuit between the first connecting member 231a and the second connecting member 231b caused by impurities falling between the first connecting member 231a and the second connecting member 231b. In addition, the creepage distance between the first connecting member 231a and the second connecting member 231b can be increased, which can further reduce the risk of short circuit of the battery monomer 20 during use.

[0201] According to some embodiments of the present application, please continue to refer to FIGS. 6, 7 and 12, the first partition portion 242 is arranged on the groove bottom surface of the assembly groove 241, and the first partition portion 242 is connected with the groove side surface of the assembly groove 241 at both ends in the direction perpendicular to the thickness direction X of the wall portion, so as to divide the assembly groove 241 into two accommodating grooves 2411, and the first connecting piece 231a and the second connecting piece 231b are arranged in the two accommodating grooves 2411 respectively.

[0202] The first partition portion 242 is connected with the groove bottom surface of the assembly groove 241 at one side of the wall portion 211 in the thickness direction X of the wall portion, and the first partition portion 242 is connected with the groove side surface of the assembly groove 241 at both ends in the second direction Z, so as to divide the assembly groove 241 into two accommodating grooves 2411 arranged in the first direction Y, and each accommodating groove 2411 is used for accommodating a connecting piece 231 of an electrode terminal 23.

[0203] It should be noted that in other embodiments, the first partition portion 242 can also be a structure connected with the groove side surface of the assembly groove 241 at only one end in the second direction Z, or a structure in which the first partition portion 242 is arranged spaced apart from the groove side surface of the assembly groove 241 at both ends in the second direction Z.

[0204] In the present embodiment, by connecting the first partition portion 242 with the groove bottom surface of the assembly groove 241, and connecting the first partition portion 242 with the groove side surface of the assembly groove 241 at both ends in the direction perpendicular to the thickness direction X of the wall portion, the first partition portion 242 can divide the assembly groove 241 of the first insulating piece 24 into two accommodating grooves 2411 for accommodating the first connecting piece 231a and the second connecting piece 231b respectively, so as to further improve the effect of the first partition portion 242 in insulating and separating the first connecting piece 231a and the second connecting piece 231b, and facilitate to reduce the risk of short circuit of the first connecting piece 231a and the second connecting piece 231b during use.

[0205] According to some embodiments of the present application, please refer to FIG. 6, along the thickness direction X of the wall portion, the connecting piece 231 has a first surface 2311 facing away from the wall portion 211, the first partition portion 242 has a second surface 2421 facing away from the wall portion 211, and the first surface 2311 is coplanar with the second surface 2421.

[0206] The first surface 2311 is coplanar with the second surface 2421, that is, the side of the connecting piece 231 facing away from the wall portion 211 is flush with the side of the first partition portion 242 facing away from the wall portion 211.

[0207] In the embodiment, by setting the first surface 2311 of the connecting piece 231 to be coplanar with the second surface 2421 of the first partition 242, the side of the connecting piece 231 away from the wall portion 211 in the thickness direction X of the wall portion and the side of the first partition 242 away from the wall portion 211 in the thickness direction X of the wall portion are flush with each other, so that the effect of the first partition 242 insulating the first connecting piece 231a and the second connecting piece 231b is improved, and the flatness between the connecting piece 231 and the first partition 242 is also improved, which is beneficial to reducing the interference between the connecting piece 231 or the first partition 242 and other components.

[0208] Of course, 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, along the thickness direction X of the wall portion, the connecting piece 231 has a first surface 2311 away from the wall portion 211, the first partition 242 has a second surface 2421 away from the wall portion 211, and the first surface 2311 is closer to the wall portion 211 than the second surface 2421 in the thickness direction X of the wall portion.

[0209] That is, the first partition 242 protrudes away from the side of the connecting piece 231 away from the wall portion 211 in the thickness direction X of the wall portion.

[0210] In the embodiment, by setting the first surface 2311 of the connecting piece 231 to be closer to the wall portion 211 than the second surface 2421 of the first partition 242 in the thickness direction X of the wall portion, the first partition 242 is configured to protrude beyond the side of the connecting piece 231 away from the wall portion 211 in the thickness direction X of the wall portion, so that the effect of the first partition 242 insulating the first connecting piece 231a and the second connecting piece 231b is improved, and the risk of short circuit of the first connecting piece 231a and the second connecting piece 231b during use is reduced.

[0211] In some embodiments, referring to FIGS. 6 and 12, the first partition 242 is integrally formed with the first insulating piece 24, that is, the first partition 242 and the first insulating piece 24 are an integral structure, and the first partition 242 and the first insulating piece 24 are structures made by an integral molding process such as injection molding or milling.

[0212] In the embodiment, by arranging the first partition portion 242 and the first insulating member 24 in an integrated structure, the connection stability and reliability between the first partition portion 242 and the first insulating member 24 are improved, the risk of the first partition portion 242 falling off during use is reduced, and the stability and reliability of the first partition portion 242 in insulating the first connecting member 231a and the second connecting member 231b are improved.

[0213] In some embodiments, as shown in FIG. 6, the connecting member 231 extends out of the assembly groove 241 along the thickness direction X of the wall portion, that is, the connecting member 231 extends out of the surface of the first insulating member 24 where the assembly groove 241 is arranged along the thickness direction X of the wall portion.

[0214] In the embodiment, by arranging the connecting member 231 to extend out of the assembly groove 241 of the first insulating member 24 along the thickness direction X of the wall portion, part of the connecting member 231 is located inside the assembly groove 241 along the thickness direction X of the wall portion, and the other part is located outside the assembly groove 241 along the thickness direction X of the wall portion, so that the connection difficulty between the connecting member 231 and the busbar component is reduced when the battery monomers 20 are subsequently assembled into a group, and the efficiency of the subsequent assembly of the battery monomers 20 into a group is improved.

[0215] According to some embodiments of the present application, as shown in FIGS. 6 and 7, the minimum distance between the first connecting member 231a and the second connecting member 231b along the direction perpendicular to the thickness direction X of the wall portion is D1, which satisfies D1≥1.5mm.

[0216] Among them, the first connecting member 231a and the second connecting member 231b are arranged along the first direction Y, and correspondingly, D1 is the minimum distance between the first connecting member 231a and the second connecting member 231b along the first direction Y.

[0217] For example, the minimum distance D1 between the first connecting member 231a and the second connecting member 231b along the first direction Y can be 1.5mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm or 8mm, etc.

[0218] In the embodiment, by arranging the minimum distance between the first connecting member 231a and the second connecting member 231b along the direction perpendicular to the thickness direction X of the wall portion to be greater than or equal to 1.5mm, the creepage distance between the first connecting member 231a and the second connecting member 231b is increased, the electrical gap between the first connecting member 231a and the second connecting member 231b is improved, and the risk of the first connecting member 231a and the second connecting member 231b being overlapped is reduced.

[0219] In some embodiments, as shown in FIG. 7, the minimum distance between the first connecting member 231a and the second connecting member 231b in the direction perpendicular to the thickness direction X of the wall portion is D1, which satisfies D1≥3 mm.

[0220] In the present embodiment, by further setting the minimum distance between the first connecting member 231a and the second connecting member 231b in the direction perpendicular to the thickness direction X of the wall portion to be greater than or equal to 3 mm, the creepage distance between the first connecting member 231a and the second connecting member 231b is further increased, so that the phenomenon of insufficient electrical clearance between the first connecting member 231a and the second connecting member 231b when the battery monomer 20 is used in high-altitude areas can be effectively alleviated, and the phenomenon of short-circuiting of the first connecting member 231a and the second connecting member 231b caused by impurities falling between the first connecting member 231a and the second connecting member 231b can be effectively alleviated, thereby reducing the risk of short-circuiting between the first connecting member 231a and the second connecting member 231b.

[0221] In some embodiments, as shown in FIG. 7, the minimum distance between the first connecting member 231a and the second connecting member 231b in the direction perpendicular to the thickness direction X of the wall portion is D1, which satisfies 4 mm≤D1≤8 mm.

[0222] In the present embodiment, by further setting the minimum distance between the first connecting member 231a and the second connecting member 231b in the direction perpendicular to the thickness direction X of the wall portion to be greater than or equal to 4 mm, the creepage distance between the first connecting member 231a and the second connecting member 231b is further increased, so that the phenomenon of insufficient electrical clearance between the first connecting member 231a and the second connecting member 231b when the battery monomer 20 is used in high-altitude areas can be further alleviated, and the phenomenon of short-circuiting of the first connecting member 231a and the second connecting member 231b caused by impurities falling between the first connecting member 231a and the second connecting member 231b can be further alleviated, thereby further reducing the risk of short-circuiting between the first connecting member 231a and the second connecting member 231b. In addition, by setting the minimum distance between the first connecting member 231a and the second connecting member 231b in the direction perpendicular to the thickness direction X of the wall portion to be less than or equal to 8 mm, the phenomenon of excessive space occupied by the first connecting member 231a and the second connecting member 231b caused by excessive spacing between the first connecting member 231a and the second connecting member 231b can be alleviated, and the assembly difficulty between the first connecting member 231a and the first insulating member 24 and between the second connecting member 231b and the first insulating member 24 can be reduced.

[0223] According to some embodiments of the present application, referring to FIGS. 6 and 7, along the thickness direction X of the wall portion, the connecting piece 231 has a first surface 2311 facing away from the wall portion 211, and an edge of the first surface 2311 includes a first edge 23111a which is in a circular arc shape.

[0224] The edge of the first surface 2311 includes the first edge 23111a which is in a circular arc shape, that is, at least part of the edge of the first surface 2311 of the connecting piece 231 is in a circular arc shape.

[0225] In the present embodiment, by setting the first edge 23111a of the first surface 2311 of the connecting piece 231 to be in a circular arc shape, at least part of the edge of the first surface 2311 of the connecting piece 231 is in a circular arc shape, so as to improve the smoothness of the edge of the first surface 2311 of the connecting piece 231, and to alleviate the phenomenon of collision between the connecting piece 231 and other components.

[0226] In some embodiments, referring to FIG. 7, in the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the wall portion 211 is in a circular shape, and the orthographic projection of the wall portion 211 and the orthographic projection of the first edge 23111a are concentrically arranged.

[0227] The shell 21 of the battery cell 20 is in a cylindrical shape, and the central axis of the shell 21 extends along the thickness direction X of the wall portion, so that the wall portion 211 is one end wall of the shell 21 in a cylindrical shape, so that the wall portion 211 is in a circular plate shape, that is, the orthographic projection of the wall portion 211 in the plane perpendicular to the thickness direction X of the wall portion is in a circular shape.

[0228] In the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the wall portion 211 and the orthographic projection of the first edge 23111a are concentrically arranged, that is, the center of the orthographic projection of the wall portion 211 in the plane perpendicular to the thickness direction X of the wall portion and the center of the orthographic projection of the first edge 23111a in the plane perpendicular to the thickness direction X of the wall portion coincide in the thickness direction X of the wall portion.

[0229] Exemplarily, the center of the orthographic projection of the wall portion 211 in the plane perpendicular to the thickness direction X of the wall portion and the center of the orthographic projection of the first edge 23111a in the plane perpendicular to the thickness direction X of the wall portion are both located on the central axis of the shell 21.

[0230] In the present embodiment, by setting the projection of the wall portion 211 in the thickness direction X of the wall portion as a circular shape, and setting the projection of the wall portion 211 in the thickness direction X of the wall portion and the projection of the first edge 23111a in the thickness direction X of the wall portion as a concentric structure, the shape of the first edge 23111a and the edge of the wall portion 211 are matched with each other, and the battery cell 20 adopting such a structure can maximize the space utilization of the first surface 2311 of the connecting piece 231 on the wall portion 211, which is beneficial to improve the area of the first surface 2311 of the connecting piece 231, so as to improve the area of the first surface 2311 of the connecting piece 231 for connecting with the busbar component when the battery cell 20 is subsequently assembled into a group, which is beneficial to improve the overcurrent capacity between the connecting piece 231 and the busbar component.

[0231] According to some embodiments of the present application, please refer to FIG. 7, the first connecting piece 231a and the second connecting piece 231b are oppositely and spacedly arranged along the first direction Y, and the first surface 2311 has a first region 23111 and a second region 23112 which are arranged along the second direction Z and are connected with each other, and the first direction Y, the second direction Z and the thickness direction X of the wall portion are perpendicular to each other. The edge of the first region 23111 includes the first edge 23111a, and the orthographic projection of the second region 23112 in a plane perpendicular to the thickness direction X of the wall portion is a rectangle, and the edge of the second region 23112 includes the second edge 23112a which is connected with and tangent to the first edge 23111a.

[0232] Wherein, the second edge 23112a is connected with and tangent to the first edge 23111a, that is, one straight edge of the second region 23112 of the first surface 2311 is connected with and tangent to the arc edge of the first region 23111 of the first surface 2311, so that the second edge 23112a is a structure perpendicular to the normal direction of the connecting position of the first edge 23111a and the second edge 23112a. Exemplarily, the second edge 23112a extends along the second direction Z.

[0233] Exemplarily, in FIG. 7, the second edge 23112a of the second region 23112 of the first surface 2311 of the connecting piece 231 of one electrode terminal 23 is located on the side of the second region 23112 away from the other electrode terminal 23 in the first direction Y.

[0234] In the embodiment, the first connecting member 231a and the second connecting member 231b are oppositely and spacedly arranged along the first direction Y, by arranging the first surface 2311 as the first region 23111 and the second region 23112 which are arranged along the second direction Z and connected, and arranging the second edge 23112a of the second region 23112 as connected and tangent to the first edge 23111a of the first region 23111, the battery monomer 20 adopting the structure can optimize the spatial layout of the first connecting member 231a and the second connecting member 231b, improve the space utilization of the connecting member 231 on the wall portion 211, and further improve the area of the first surface 2311, so as to further improve the area of the first surface 2311 of the connecting member 231 for connecting with the busbar component when the battery monomer 20 is subsequently assembled into a group.

[0235] In some embodiments, as shown in FIG. 7, the first region 23111 further includes a third edge 23111b, and the second region 23112 further includes a fourth edge 23112b, the fourth edge 23112b is oppositely arranged with the second edge 23112a along the first direction Y, the third edge 23111b connects the fourth edge 23112b and the first edge 23111a, and the fourth edge 23112b and the third edge 23111b are arranged in a same line.

[0236] In some embodiments, as shown in FIG. 7, the first region 23111 further includes a third edge 23111b, and the second region 23112 further includes a fourth edge 23112b, the fourth edge 23112b is oppositely arranged with the second edge 23112a along the first direction Y, the third edge 23111b connects the fourth edge 23112b and the first edge 23111a, and the fourth edge 23112b and the third edge 23111b are arranged in a same line.

[0237] In FIG. 7, the end of the second region 23112 away from the first region 23111 along the second direction Z is a fifth edge 23112c of the second region 23112, the fifth edge 23112c is connected between the second edge 23112a and the fourth edge 23112b of the second region 23112 along the first direction Y, it should be noted that the fifth edge 23112c and the second edge 23112a can be directly connected to form a right angle structure, or indirectly connected through a rounded edge to form a circular arc transition structure, for example, in FIG. 7, the fifth edge 23112c and the fourth edge 23112b are directly connected to form a right angle structure, and the fifth edge 23112c and the second edge 23112a are connected through a rounded edge to form a circular arc transition structure, that is, a rounded structure is formed between the fifth edge 23112c and the second edge 23112a.

[0238] The fourth edge 23112b and the third edge 23111b are arranged in line, i.e., the fourth edge 23112b and the third edge 23111b are connected to each other and parallel, and exemplarily, the third edge 23111b and the fourth edge 23112b both extend along the second direction Z.

[0239] Exemplarily, in FIG. 7, the third edges 23111b of the first surfaces 2311 of the connecting pieces 231 of the two electrode terminals 23 are arranged to face each other in the first direction Y, and the fourth edges 23112b of the first surfaces 2311 of the connecting pieces 231 of the two electrode terminals 23 are arranged to face each other in the first direction Y.

[0240] In the present embodiment, by arranging the fourth edge 23112b opposite to the second edge 23112a in the second region 23112 to be connected to the third edge 23111b of the first region 23111 and in line with each other, the regularity of the shape of the first surface 2311 can be improved while the area of the first surface 2311 is increased, which is beneficial to reduce the manufacturing difficulty of the connecting piece 231 of the electrode terminal 23, and further optimize the spatial layout of the first connecting piece 231a and the second connecting piece 231b to further improve the space utilization of the connecting piece 231 on the wall portion 211.

[0241] According to some embodiments of the present application, referring to FIG. 6 and FIG. 11, and further referring to FIG. 13, which is a sectional view of the electrode terminal 23 of the battery cell 20 provided by some embodiments of the present application. The wall portion 211 is provided with two mounting holes 2111, which extend through both sides of the wall portion 211 along the thickness direction X of the wall portion, and the electrode terminal 23 corresponds to the mounting hole 2111 one by one. The electrode terminal 23 further comprises a terminal body 232, which is arranged in the mounting hole 2111 along the thickness direction X of the wall portion and connected to the connecting piece 231, and the terminal body 232 is electrically connected to the tab 222.

[0242] Among them, the mounting hole 2111 is a structure extending along the thickness direction X of the wall portion, and the two ends of the mounting hole 2111 in the thickness direction X of the wall portion respectively extend to the surfaces of the two sides of the wall portion 211 in the thickness direction X of the wall portion.

[0243] The electrode terminal 23 corresponds to the mounting hole 2111 one by one, i.e., each electrode terminal 23 is fitted into one mounting hole 2111.

[0244] In the embodiments of the present application, the terminal body 232 is the main part of the electrode terminal 23, and mainly serves to electrically connect the tab 222 and the bus member. The terminal body 232 is inserted into the corresponding mounting hole 2111 along the thickness direction X of the wall portion, and the two ends of the terminal body 232 in the thickness direction X of the wall portion protrude from the surfaces on both sides of the wall portion 211, so that one end of the terminal body 232 in the thickness direction X of the wall portion located in the shell 21 can be electrically connected with the tab 222, and the other end of the terminal body 232 in the thickness direction X of the wall portion located outside the shell 21 can be connected with the connecting piece 231, so as to realize the input or output of the electric energy of the battery monomer 20.

[0245] Optionally, the connection structure between the terminal body 232 and the connecting piece 231 can be various, such as riveting, welding connection, clamping or bonding, etc. Similarly, the connection structure between the terminal body 232 and the tab 222 can also be various, and the terminal body 232 can be directly connected with the tab 222, such as welding connection or abutting, etc. Of course, the terminal body 232 can also be indirectly connected with the tab 222 through other components, such as the terminal body 232 being connected with the tab 222 through the current collecting member 25.

[0246] In the embodiments of the present application, the electrode terminal 23 is also provided with the terminal body 232, which is inserted into the mounting hole 2111 of the wall portion 211 along the thickness direction X of the wall portion, so that one end of the terminal body 232 is located on the side of the wall portion 211 facing the electrode assembly 22 and can be connected with the tab 222, and the other end of the terminal body 232 is located on the side of the wall portion 211 away from the electrode assembly 22 and can be connected with the connecting piece 231, so as to realize the electrical connection of the electrode terminal 23 with the tab 222 of the electrode assembly 22, and realize the input or output of the electric energy of the battery monomer 20 by the electrode terminal 23, which is simple in structure and convenient to assemble.

[0247] According to some embodiments of the present application, as shown in FIG. 6, along the thickness direction X of the wall portion, the first insulating member 24 protrudes two protrusions 243 on the side facing the wall portion 211, each protrusion 243 is inserted into one mounting hole 2111, and the protrusion 243 is located between the terminal body 232 and the hole wall surface of the mounting hole 2111, so as to insulate and isolate the wall portion 211 and the terminal body 232.

[0248] The protrusions 243 are protruded on the surface of the first insulating member 24 abutting against the wall portion 211, each of the protrusions 243 is inserted into the corresponding mounting hole 2111 along the thickness direction X of the wall portion, the protrusions 243 and the first insulating member 24 can be an integrally formed structure, for example, the protrusions 243 and the first insulating member 24 can be integrally formed by injection molding or milling, of course, the protrusions 243 and the first insulating member 24 can also be a separate structure, the protrusions 243 can be connected to the surface of the side of the first insulating member 24 facing the wall portion 211 by bonding or clamping.

[0249] The protrusions 243 are located between the terminal body 232 and the hole wall surface of the mounting hole 2111, so as to insulate and separate the wall portion 211 and the terminal body 232, that is, at least part of the protrusions 243 is located between the outer circumferential surface of the terminal body 232 and the hole wall surface of the mounting hole 2111, so that the protrusions 243 can insulate and separate the wall portion 211 and the terminal body 232.

[0250] In the embodiment, by protruding the protrusions 243 on the side of the first insulating member 24 facing the wall portion 211, the protrusions 243 are inserted into the corresponding mounting hole 2111 along the thickness direction X of the wall portion, and the protrusions 243 extend between the corresponding terminal body 232 and the hole wall surface of the mounting hole 2111. The battery monomer 20 with such a structure can play a certain positioning and limiting role on the first insulating member 24 through the cooperation of the protrusions 243 and the mounting hole 2111, which is beneficial to improve the precision and stability of the first insulating member 24 assembled to the wall portion 211, on the other hand, the protrusions 243 can also play an insulating and separating role between the terminal body 232 and the hole wall surface of the mounting hole 2111, which is beneficial to reduce the risk of short circuit between the terminal body 232 and the wall portion 211.

[0251] In some embodiments, please continue to refer to FIG. 6, the protrusions 243 are arranged around the terminal body 232, that is, the protrusions 243 are annular structures around the outside of the terminal body 232.

[0252] In the embodiment, by arranging the protrusions 243 as annular structures around the outside of the terminal body 232, the effect of the protrusions 243 insulating and separating the terminal body 232 and the hole wall surface of the mounting hole 2111 is further improved, which is beneficial to further reduce the risk of short circuit between the terminal body 232 and the wall portion 211.

[0253] According to some embodiments of the present application, referring to FIG. 6, the battery monomer 20 can also include two sealing members 26, the sealing members 26 correspond one-to-one to the electrode terminals 23, the sealing members 26 are arranged between the terminal body 232 and the wall portion 211, and the sealing members 26 are configured to seal the gap between the terminal body 232 and the hole wall surface of the mounting hole 2111.

[0254] The sealing member 26 can be made of various materials, such as rubber, plastic, or silicone, and the like.

[0255] For example, referring to FIGS. 6 and 13, the sealing member 26 is arranged between the wall portion 211 and the second clamping portion 2322 of the terminal body 232 to indirectly seal the gap between the terminal body 232 and the hole wall surface of the mounting hole 2111 by sealing the gap between the wall portion 211 and the second clamping portion 2322 of the terminal body 232. Of course, in other embodiments, the sealing member 26 can be arranged in the mounting hole 2111, i.e., the sealing member 26 is arranged between the outer circumferential surface of the terminal body 232 and the hole wall surface of the mounting hole 2111 to seal the gap between the terminal body 232 and the hole wall surface of the mounting hole 2111.

[0256] In this embodiment, the sealing member 26 is arranged between each terminal body 232 and the wall portion 211, so that the sealing member 26 can also seal the gap between the corresponding terminal body 232 and the wall portion 211, thereby reducing the leakage of gas or liquid from the mounting hole 2111 of the wall portion 211, and reducing the risk of liquid leakage or gas leakage of the battery monomer 20 during use.

[0257] According to some embodiments of the present application, referring to FIGS. 6 and 13, the outer circumferential surface of the terminal body 232 protrudes with a first clamping portion 2321, and the first clamping portion 2321 abuts against the connecting member 231 along the thickness direction X of the wall portion to limit the connecting member 231 from separating from the wall portion 211 in a direction away from the wall portion 211.

[0258] The first clamping portion 2321 limits the connecting member 231 from separating from the wall portion 211 in a direction away from the wall portion 211 along the thickness direction X of the wall portion, and the first clamping portion 2321 abuts against the connecting member 231 along the thickness direction X of the wall portion, i.e., at least part of the connecting member 231 is located between the first clamping portion 2321 and the wall portion 211 along the thickness direction X of the wall portion.

[0259] In this embodiment, the first clamping portion 2321 is protruded on the outer circumferential surface of the terminal body 232, and the first clamping portion 2321 can abut against the connecting member 231 along the thickness direction X of the wall portion to limit the connecting member 231 from separating from the wall portion 211 in a direction away from the wall portion 211 along the thickness direction X of the wall portion, thereby achieving the assembly and fixation of the connecting member 231 on the wall portion 211, which is simple in structure and convenient to assemble.

[0260] According to some embodiments of the present application, referring to FIG. 13, the connecting piece 231 is provided with a connecting hole 2312 penetrating the connecting piece 231 along the thickness direction X of the wall portion, the connecting hole 2312 comprises a first hole section 2312a and a second hole section 2312b arranged along the thickness direction X of the wall portion, the hole diameter of the first hole section 2312a is larger than the hole diameter of the second hole section 2312b, the first hole section 2312a is located at the end of the second hole section 2312b away from the wall portion 211, and the hole wall surface of the first hole section 2312a and the hole wall surface of the second hole section 2312b are connected by a step surface 2312c. The terminal body 232 is inserted into the connecting hole 2312 along the thickness direction X of the wall portion, and at least part of the first clamping portion 2321 is located in the first hole section 2312a, and the first clamping portion 2321 abuts on the step surface 2312c in the thickness direction X of the wall portion.

[0261] The connecting hole 2312 comprises a first hole section 2312a and a second hole section 2312b arranged along the thickness direction X of the wall portion, the hole diameter of the first hole section 2312a is larger than the hole diameter of the second hole section 2312b, that is, the connecting hole 2312 is a stepped hole structure with the first hole section 2312a and the second hole section 2312b, and the projection of the second hole section 2312b in the thickness direction X of the wall portion is located in the first hole section 2312a.

[0262] The first hole section 2312a is located at the end of the second hole section 2312b away from the wall portion 211, that is, the first hole section 2312a is farther away from the wall portion 211 in the thickness direction X of the wall portion than the second hole section 2312b.

[0263] The hole wall surface of the first hole section 2312a and the hole wall surface of the second hole section 2312b are connected by a step surface 2312c, the step surface 2312c is a plane connecting the hole wall surface of the first hole section 2312a and the hole wall surface of the second hole section 2312b, and the step surface 2312c is perpendicular to the thickness direction X of the wall portion.

[0264] In the present embodiment, by providing the connecting piece 231 with a connecting hole 2312 penetrating the connecting piece 231 along the thickness direction X of the wall portion, and the connecting hole 2312 being a stepped hole structure comprising a first hole section 2312a and a second hole section 2312b arranged along the thickness direction X of the wall portion, a step surface 2312c is formed between the hole wall surface of the first hole section 2312a and the hole wall surface of the second hole section 2312b, so that by inserting the terminal body 232 into the connecting hole 2312 and abutting the first clamping portion 2321 on the step surface 2312c, the assembly between the terminal body 232 and the connecting piece 231 can be achieved, which is simple in structure, easy to implement, and has high stability.

[0265] In some embodiments, please continue to refer to FIG. 13, the connecting piece 231 has a first surface 2311 facing away from the wall portion 211 in the thickness direction X of the wall portion. The connecting hole 2312 penetrates the first surface 2311. In the thickness direction X of the wall portion, one end of the terminal body 232 inserted into the connecting hole 2312 does not protrude out of the first surface 2311.

[0266] In some embodiments, please continue to refer to FIG. 13, the connecting piece 231 has a first surface 2311 facing away from the wall portion 211 in the thickness direction X of the wall portion. The connecting hole 2312 penetrates the first surface 2311. In the thickness direction X of the wall portion, one end of the terminal body 232 inserted into the connecting hole 2312 does not protrude out of the first surface 2311.

[0267] In some embodiments, please continue to refer to FIG. 13, the connecting piece 231 has a first surface 2311 facing away from the wall portion 211 in the thickness direction X of the wall portion. The connecting hole 2312 penetrates the first surface 2311. In the thickness direction X of the wall portion, one end of the terminal body 232 inserted into the connecting hole 2312 does not protrude out of the first surface 2311.

[0268] In some embodiments, please continue to refer to FIG. 13, the connecting piece 231 has a first surface 2311 facing away from the wall portion 211 in the thickness direction X of the wall portion. The connecting hole 2312 penetrates the first surface 2311. In the thickness direction X of the wall portion, one end of the terminal body 232 inserted into the connecting hole 2312 does not protrude out of the first surface 2311.

[0269] In some embodiments, please continue to refer to FIG. 13, the connecting piece 231 has a first surface 2311 facing away from the wall portion 211 in the thickness direction X of the wall portion. The connecting hole 2312 penetrates the first surface 2311. In the thickness direction X of the wall portion, one end of the terminal body 232 inserted into the connecting hole 2312 does not protrude out of the first surface 2311.

[0270] In some embodiments, please continue to refer to FIG. 13, the connecting piece 231 has a first surface 2311 facing away from the wall portion 211 in the thickness direction X of the wall portion. The connecting hole 2312 penetrates the first surface 2311. In the thickness direction X of the wall portion, one end of the terminal body 232 inserted into the connecting hole 2312 does not protrude out of the first surface 2311.

[0271] In the embodiment, the second clamping portion 2322 is protruded on the outer circumferential surface of the terminal body 232, and is located on the side of the wall portion 211 facing the electrode assembly 22. By arranging at least part of the wall portion 211 between the second clamping portion 2322 and the connecting piece 231, the second clamping portion 2322 and the connecting piece 231 can clamp and assemble the wall portion 211, so as to fasten the electrode terminal 23 to the wall portion 211, thereby realizing the assembly between the electrode terminal 23 and the wall portion 211, which is simple in structure, easy to realize, and high in stability.

[0272] According to some embodiments of the present application, referring to FIGS. 6 and 11, the battery monomer 20 can further include two current collecting members 25, both of which are arranged between the wall portion 211 and the body portion 221, and one current collecting member 25 connects one electrode terminal 23 and one tab 222.

[0273] The current collecting member 25 serves to connect the electrode terminal 23 and the tab 222, and the material of the current collecting member 25 can be various, such as copper, iron, aluminum, steel, or aluminum alloy, etc. Similarly, the connection structure between the current collecting member 25 and the tab 222 and between the current collecting member 25 and the electrode terminal 23 can also be various, such as welding connection or abutment, etc.

[0274] It should be noted that in the embodiment in which the electrode terminal 23 includes the terminal body 232 and the connecting piece 231, the current collecting member 25 is a structure connecting the tab 222 and the terminal body 232 of the electrode terminal 23.

[0275] In the embodiment, by arranging two current collecting members 25 between the wall portion 211 and the body portion 221, and connecting one current collecting member 25 with one electrode terminal 23 and one tab 222, the difficulty of electrical connection between the tab 222 and the electrode terminal 23 can be reduced, so as to improve the assembly efficiency of the battery monomer 20.

[0276] According to some embodiments of the present application, referring to FIGS. 6 and 11, and further referring to FIG. 14, which is an assembly schematic view of the second insulating member 27 and the current collecting member 25 of the battery monomer 20 provided by some embodiments of the present application. The battery monomer 20 can further include a second insulating member 27 arranged between the wall portion 211 and the body portion 221. The two current collecting members 25 are arranged on the second insulating member 27 in a spaced manner, and the second insulating member 27 is configured to insulate and isolate the two current collecting members 25.

[0277] The two current collecting members 25 are arranged on the second insulating member 27 in a spaced manner, that is, the two current collecting members 25 are arranged on the second insulating member 27 in a spaced manner, so that the second insulating member 27 can provide the functions of assembling and fixing the two current collecting members 25 and insulating the two current collecting members 25.

[0278] For example, the second insulating member 27 can be made of rubber, silica gel or plastic.

[0279] In this embodiment, by arranging the second insulating member 27 between the wall portion 211 and the body portion 221 and arranging the two current collecting members 25 on the second insulating member 27 in a spaced manner, the battery monomer 20 with this structure can improve the stability of the two current collecting members 25 arranged between the wall portion 211 and the body portion 221, which is beneficial to reduce the risk of shaking of the two current collecting members 25 during use. On the other hand, the second insulating member 27 can insulate and separate the two current collecting members 25 to reduce the risk of short circuit between the two current collecting members 25, and the two current collecting members 25 can also share the second insulating member 27, which is beneficial to reduce the assembly difficulty of the battery monomer 20 and optimize the assembly process of the battery monomer 20.

[0280] In some embodiments, referring to FIGS. 6 and 14, part of the current collecting member 25 is embedded in the second insulating member 27. That is, the second insulating member 27 covers the outside of part of the current collecting member 25, so that part of the current collecting member 25 is located inside the second insulating member 27.

[0281] It should be noted that in other embodiments, the assembly structure between the current collecting member 25 and the second insulating member 27 can also be other structures, for example, the current collecting member 25 can also be assembled on the second insulating member 27 by bonding, bolting or clamping.

[0282] In this embodiment, by embedding part of the current collecting member 25 in the second insulating member 27, the structural stability and reliability of the current collecting member 25 arranged on the second insulating member 27 are improved, which is beneficial to reduce the risk of short circuit between the current collecting member 25 and other components after the current collecting member 25 is separated from the second insulating member 27.

[0283] According to some embodiments of the present application, referring to FIG. 14, the current collecting member 25 can include a first portion 251, a second portion 252, and a third portion 253, the first portion 251 and the second portion 252 are oppositely arranged along the thickness direction X of the wall portion, and the third portion 253 connects the first portion 251 and the second portion 252. The first portion 251 is partially embedded in the second insulating member 27, and the first portion 251 is connected to the tab 222. The second portion 252 is located on the side of the second insulating member 27 away from the main body portion 221 along the thickness direction X of the wall portion, and the second portion 252 is connected to the electrode terminal 23.

[0284] The first portion 251, the third portion 253, and the second portion 252 of the current collecting member 25 are sequentially connected, that is, the third portion 253 is connected between the first portion 251 and the second portion 252, and the first portion 251 and the second portion 252 are oppositely arranged along the thickness direction X of the wall portion, that is, the first portion 251 and the second portion 252 are arranged in a spaced manner along the thickness direction X of the wall portion, so that the third portion 253 is a curved structure.

[0285] Exemplarily, in FIG. 14, the first portion 251, the second portion 252, and the third portion 253 of the current collecting member 25 are integrally formed, that is, the current collecting member 25 is partially bent to form the third portion 253, so that the current collecting member 25 has a "U" shape structure, and the first portion 251 and the second portion 252 are arranged in a spaced manner along the thickness direction X of the wall portion. Of course, in other embodiments, the first portion 251, the second portion 252, and the third portion 253 of the current collecting member 25 can also be arranged in a separate manner, and the connection structure between the first portion 251, the second portion 252, and the third portion 253 of the current collecting member 25 can be various, such as welding connection or clamping, etc.

[0286] The first portion 251 is partially embedded in the second insulating member 27, and the first portion 251 is connected to the tab 222, that is, the first portion 251 of the current collecting member 25 is a region where the current collecting member 25 and the tab 222 are connected to each other, and the first portion 251 of the current collecting member 25 is a portion embedded in the second insulating member 27.

[0287] The second portion 252 is located on the side of the second insulating member 27 away from the main body portion 221 along the thickness direction X of the wall portion, and the second portion 252 is connected to the electrode terminal 23, that is, the second portion 252 of the current collecting member 25 is a region where the current collecting member 25 and the electrode terminal 23 are connected to each other, and the second portion 252 of the current collecting member 25 is located on the side of the second insulating member 27 facing the wall portion 211 along the thickness direction X of the wall portion, so that the second portion 252 of the current collecting member 25 is a structure located on the side of the first portion 251 facing the wall portion 211 along the thickness direction X of the wall portion.

[0288] In the embodiment, the current collecting member 25 is provided with a first portion 251, a second portion 252 and a third portion 253, the first portion 251 and the second portion 252 are oppositely arranged along the thickness direction X of the wall portion, and the third portion 253 connects the first portion 251 and the second portion 252, so that the current collecting member 25 is bent to form a structure similar to a "U" shape. By embedding the first portion 251 in the second insulating piece 27 and connecting it with the tab 222, and arranging the second portion 252 on the side of the second insulating piece 27 facing the wall portion 211 and connecting it with the electrode terminal 23, the battery monomer 20 with such a structure can reduce the difficulty of connecting the current collecting member 25 with the electrode terminal 23 and the tab 222, and is beneficial to improving the assembly efficiency of the battery monomer 20.

[0289] According to some embodiments of the present application, referring to FIGS. 6 and 14, the second insulating piece 27 can include a mounting portion 271 and a second separation portion 272, part of the first portion 251 is embedded in the mounting portion 271, the second separation portion 272 is arranged on the side of the mounting portion 271 facing the wall portion 211 in the thickness direction X of the wall portion, and the second separation portion 272 is located between the second portions 252 of the two current collecting members 25, and the second separation portion 272 is configured to insulate the second portions 252 of the two current collecting members 25.

[0290] Among them, the mounting portion 271 and the second separation portion 272 of the second insulating piece 27 are structures arranged along the thickness direction X of the wall portion, and the second separation portion 272 is located on the side of the mounting portion 271 facing the wall portion 211. It should be noted that the mounting portion 271 and the second separation portion 272 of the second insulating piece 27 can be a structure not connected to each other, that is, the mounting plate and the second separation portion 272 can be separated from each other. Of course, the mounting portion 271 and the second separation portion 272 of the second insulating piece 27 can also be a structure connected to each other. If the mounting portion 271 and the second separation portion 272 of the second insulating piece 27 are connected to each other, the connection structure between the mounting portion 271 and the second separation portion 272 of the second insulating piece 27 can be various, such as bonding or clamping, etc.

[0291] Exemplarily, in the embodiments of the present application, the mounting portion 271 and the second separation portion 272 of the second insulating piece 27 are a structure not connected to each other.

[0292] The second partition portion 272 is located between the second portions 252 of the two current collecting members 25, and is configured to insulatingly separate the second portions 252 of the two current collecting members 25, that is, the second partition portion 272 is a component of the second insulating member 27 that plays a partitioning role between the second portions 252 of the two current collecting members 25. In FIG. 6, the two current collecting members 25 are spaced apart along the first direction Y on the mounting portion 271 of the second insulating member 27, and correspondingly, the second portions 252 of the two current collecting members 25 are arranged in a spaced apart manner along the first direction Y, so that the second partition portion 272 of the second insulating member 27 is located between the second portions 252 of the two current collecting members 25 along the first direction Y. Exemplarily, in FIG. 6, the second portion 252 of the current collecting member 25 is embedded in the second portion 252 at one end close to the second partition portion 272 along the first direction Y.

[0293] In the present embodiment, the second insulating member 27 is provided with the mounting portion 271 and the second partition portion 272, by embedding the first portions 251 of the current collecting members 25 in the mounting portion 271 and arranging the second partition portion 272 between the second portions 252 of the two current collecting members 25, so that the mounting portion 271 can insulatingly separate the first portions 251 of the two current collecting members 25 while also playing an insulating partitioning role between the first portions 251 of the two current collecting members 25 through the second partition portion 272, which is conducive to further improving the effect of the second insulating member 27 insulatingly separating the two current collecting members 25, so as to reduce the risk of short circuit of the two current collecting members 25 during use.

[0294] In some embodiments, as shown in FIGS. 6 and 14, the second portion 252 is provided with a through hole 2521 that penetrates through both sides of the second portion 252 along the thickness direction X of the wall portion. Along the thickness direction X of the wall portion, the electrode terminal 23 is inserted into the through hole 2521.

[0295] Among them, the through hole 2521 is a structure that penetrates through the surfaces of both sides of the second portion 252 of the current collecting member 25 along the thickness direction X of the wall portion, and the electrode terminal 23 is inserted into the through hole 2521 along the thickness direction X of the wall portion, so that the second portion 252 is a structure that is sleeved on the outside of the electrode terminal 23.

[0296] It should be noted that, in the embodiment in which the electrode terminal 23 includes the terminal body 232, the terminal body 232 is arranged in the through hole 2521 in the thickness direction X of the wall portion, and of course, in the embodiment in which the second clamping portion 2322 is protruded from the outer circumferential surface of the terminal body 232, the second clamping portion 2322 is located on the side of the second portion 252 away from the wall portion 211 in the thickness direction X of the wall portion, that is, the second clamping portion 2322 is located between the first portion 251 and the second portion 252 of the current collecting member 25 in the thickness direction X of the wall portion, so that the second portion 252 is located between the second clamping portion 2322 and the wall portion 211 in the thickness direction X of the wall portion. The battery monomer 20 with such a structure can further improve the assembly stability and firmness between the electrode terminal 23 and the current collecting member 25.

[0297] In the present embodiment, by providing the through hole 2521 penetrating the second portion 252 in the thickness direction X of the wall portion on the second portion 252 of the current collecting member 25, the electrode terminal 23 can be arranged in the through hole 2521, so that the second portion 252 can be sleeved outside the electrode terminal 23, thereby further improving the connection stability and firmness between the electrode terminal 23 and the second portion 252 of the current collecting member 25, and reducing the assembly difficulty between the electrode terminal 23 and the second portion 252 of the current collecting member 25.

[0298] According to some embodiments of the present application, referring to FIGS. 5, 6 and 11, the battery monomer 20 can further include a third insulating piece 28, which is arranged between the wall portion 211 and the current collecting member 25, and is configured to insulate and separate the current collecting member 25 and the wall portion 211.

[0299] The third insulating piece 28 is located on the side of the wall portion 211 facing the electrode assembly 22 in the thickness direction X of the wall portion, and at least part of the third insulating piece 28 is located between the current collecting member 25 and the wall portion 211, so that the third insulating piece 28 can insulate and separate the current collecting member 25 and the wall portion 211. The material of the third insulating piece 28 can be various, such as rubber, silicone or plastic.

[0300] In the present embodiment, by arranging the third insulating piece 28 between the wall portion 211 and the current collecting member 25, the third insulating piece 28 can insulate and separate the current collecting member 25 and the wall portion 211, thereby reducing the lap phenomenon between the current collecting member 25 and the wall portion 211, and reducing the risk of short circuit of the battery monomer 20 during use.

[0301] According to some embodiments of the present application, as shown in FIG. 5, FIG. 8 and FIG. 9, the electrode assembly 22 includes first and second polar pieces 223 and 225 having opposite polarities, the first polar piece 223 has a first polar piece body 2231 and a first sub-tab 2232 connected to the first polar piece body 2231 at one end thereof in the thickness direction X of the wall portion 211, the second polar piece 225 has a second polar piece body 2251 and a second sub-tab 2252 connected to the second polar piece body 2251 at one end thereof in the thickness direction X of the wall portion 211, all the first sub-tabs 2232 in the electrode assembly 22 form the first tab 222a, all the second sub-tabs 2252 in the electrode assembly 22 form the second tab 222b, and the body portion 221 includes the first polar piece body 2231 and the second polar piece body 2251. In the thickness direction X of the wall portion, the second polar piece body 2251 has a first end 2251a away from the wall portion 211, and the first polar piece body 2231 extends beyond the first end 2251a.

[0302] In the first polar piece 223, a plurality of first sub-tabs 2232 are connected to the first polar piece body 2231 at one end thereof in the thickness direction X of the wall portion 211, and the plurality of first sub-tabs 2232 form the first tab 222a of the electrode assembly 22, i.e., the first sub-tab 2232 is a plurality of sub-tabs 2221 of the first tab 222a of the two tabs 222 of the electrode assembly 22. Similarly, in the second polar piece 225, a plurality of second sub-tabs 2252 are connected to the second polar piece body 2251 at one end thereof in the thickness direction X of the wall portion 211, and the plurality of second sub-tabs 2252 form the second tab 222b of the electrode assembly 22, i.e., the second sub-tab 2252 is a plurality of sub-tabs 2221 of the second tab 222b of the two tabs 222 of the electrode assembly 22.

[0303] The body portion 221 includes the first polar piece body 2231 and the second polar piece body 2251, i.e., the body portion 221 of the electrode assembly 22 at least includes the first polar piece body 2231 of the first polar piece 223 and the second polar piece body 2251 of the second polar piece 225, and in the embodiments of the present application, the electrode assembly 22 further includes a separator 224 arranged between the first polar piece 223 and the second polar piece 225 to separate the first polar piece body 2231 of the first polar piece 223 and the second polar piece body 2251 of the second polar piece 225, and the first polar piece body 2231, the separator 224 and the second polar piece body 2251 are wound to form the body portion 221 of the electrode assembly 22.

[0304] In the thickness direction X of the wall portion, the second tab body 2251 has a first end 2251a away from the wall portion 211, and the first tab body 2231 extends beyond the first end 2251a, that is, the first tab body 2231 of the first tab 223 extends beyond the second tab body 2251 of the second tab 225 in the thickness direction X of the wall portion.

[0305] In the embodiment, by arranging the first tab body 2231 of the first tab 223 to extend beyond the end of the second tab body 2251 of the second tab 225 away from the wall portion 211, the density of the main body portion 221 of the electrode assembly 22 at the end of the wall portion 211 in the thickness direction X of the wall portion is reduced, which on one hand facilitates the electrolyte in the shell 21 to enter the main body portion 221 of the electrode assembly 22 by capillary action, and is beneficial to improve the electrolyte wetting effect of the electrode assembly 22, so as to improve the use performance of the battery monomer 20, and on the other hand, when the battery monomer 20 is in thermal runaway, the exhaust smoothness inside the electrode assembly 22 is improved, which is beneficial to improve the pressure relief rate of the battery monomer 20.

[0306] According to some embodiments of the present application, as shown in FIG. 8, in the thickness direction X of the wall portion, the first tab body 2231 has an overhanging area 2231a beyond the first end 2251a, and the length L of the overhanging area 2231a satisfies 1.5mm≤L≤5mm.

[0307] The overhanging area 2231a of the first tab body 2231 is the part of the first tab body 2231 of the first tab 223 that extends beyond the first end 2251a of the second tab body 2251 in the thickness direction X of the wall portion.

[0308] The length L of the overhanging area 2231a is the dimension of the first tab body 2231 of the first tab 223 extending beyond the end of the second tab body 2251 of the second tab 225 away from the wall portion 211 in the thickness direction X of the wall portion. Exemplarily, the length L of the overhanging area 2231a can be 1.5mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm.

[0309] In the present embodiment, by setting the length of the first tab body 2231 of the first tab 223 to exceed the first end 2251a of the tab body of the second tab 225 in the thickness direction X of the wall portion to be 1.5 mm to 5 mm, on the one hand, the length of the body portion 221 of the electrode assembly 22 away from the region of lower density of the one end of the wall portion 211 in the thickness direction X of the wall portion is greater than or equal to 1.5 mm, so that the effect of the electrolyte in the shell 21 entering the body portion 221 of the electrode assembly 22 by capillary action can be improved, so as to further improve the electrolyte wetting effect of the electrode assembly 22, and further improve the smoothness of the exhaust inside the electrode assembly 22 when the battery monomer 20 is in thermal runaway, which is beneficial to further improve the pressure relief rate of the battery monomer 20. On the other hand, by setting the length of the first tab body 2231 of the first tab 223 to exceed the first end 2251a of the tab body of the second tab 225 in the thickness direction X of the wall portion to be less than or equal to 5 mm, the phenomenon of energy density reduction of the electrode assembly 22 caused by excessive waste of the first tab 223 can be alleviated.

[0310] In some embodiments, please continue to refer to FIG. 8, along the thickness direction X of the wall portion, the first tab body 2231 has an exceeding area 2231a exceeding the first end 2251a, and the length L of the exceeding area 2231a satisfies 2.5 mm≤L≤5 mm.

[0311] In the present embodiment, by further setting the length of the first tab body 2231 of the first tab 223 to exceed the first end 2251a of the tab body of the second tab 225 in the thickness direction X of the wall portion to be greater than or equal to 2.5 mm, the length of the body portion 221 of the electrode assembly 22 away from the region of lower density of the one end of the wall portion 211 in the thickness direction X of the wall portion is greater than or equal to 2.5 mm, so that the effect of the electrolyte in the shell 21 entering the body portion 221 of the electrode assembly 22 by capillary action can be further improved, so as to further improve the electrolyte wetting effect of the electrode assembly 22, and further improve the smoothness of the exhaust inside the electrode assembly 22 when the battery monomer 20 is in thermal runaway, which is beneficial to further improve the pressure relief rate of the battery monomer 20.

[0312] According to some embodiments of the present application, the first tab 223 is a negative tab, and the second tab 225 is a positive tab. Of course, in other embodiments, the first tab 223 can also be a positive tab of the electrode assembly 22, and correspondingly, the second tab 225 is a negative tab of the electrode assembly 22.

[0313] In the present embodiment, by setting the first tab 223 as a negative tab and correspondingly setting the second tab 225 as a positive tab, the negative tab is configured to protrude away from one end of the wall portion 211 in the thickness direction X of the wall portion, thereby reducing the risk of ion metal precipitation of the electrode assembly 22 during use, so as to improve the use stability and reliability of the battery monomer 20.

[0314] According to some embodiments of the present application, as shown in FIGS. 8, 9 and 10, the tab 222 includes a plurality of sub-tabs 2221, the sub-tab 2221 includes a root portion 2221a, a bending portion 2221b and a connecting portion 2221c, the root portion 2221a is connected with the main body portion 221, the bending portion 2221b connects the root portion 2221a and the connecting portion 2221c, and the connecting portion 2221c is electrically connected with the electrode terminal 23. The root portion 2221a extends along the thickness direction X of the wall portion, and the extension direction of the connecting portion 2221c intersects with the extension direction of the root portion 2221a.

[0315] In the present embodiment, the tab 222 includes a plurality of sub-tabs 2221, that is, the tab 222 of the electrode assembly 22 is configured as a structure formed by a plurality of sub-tabs 2221, that is, the first tab 222a of the two tabs 222 of the electrode assembly 22 is configured as a structure formed by a plurality of first sub-tabs 2232 of the first tab 223, and the second tab 222b is configured as a structure formed by a plurality of second sub-tabs 2252 of the second tab 225.

[0316] The bending portion 2221b of the sub-tab 2221 is configured as a structure formed by local bending of the sub-tab 2221, so that the sub-tab 2221 is formed with the root portion 2221a connected with the main body portion 221, and is formed with the connecting portion 2221c connected with the electrode terminal 23, and correspondingly, the bending portion 2221b is connected between the root portion 2221a and the connecting portion 2221c. In the embodiment in which the first tab 223 includes the first tab main body 2231, the root portion 2221a of the first sub-tab 2232 of the first tab 223 is configured as a structure connected with the first tab main body 2231. Similarly, in the embodiment in which the second tab 225 includes the second tab main body 2251, the root portion 2221a of the second sub-tab 2252 of the second tab 225 is configured as a structure connected with the second tab main body 2251.

[0317] The root portion 2221a extends along the thickness direction X of the wall portion, and the extension direction of the connecting portion 2221c intersects with the extension direction of the root portion 2221a, that is, the extension direction of the root portion 2221a of the sub-tab 2221 is consistent with the thickness direction X of the wall portion, and the extension direction of the connecting portion 2221c and the extension direction of the root portion 2221a are structures arranged at an acute angle, an obtuse angle or a right angle, and exemplarily, in the embodiment of the present application, the extension direction of the connecting portion 2221c and the extension direction of the root portion 2221a are perpendicular or approximately perpendicular to each other.

[0318] In the embodiment, the tab 222 is composed of a plurality of sub-tabs 2221, and each sub-tab 2221 includes a root portion 2221a, a bending portion 2221b and a connecting portion 2221c connected in sequence. By setting the root portion 2221a to extend along the thickness direction X of the wall portion, and setting the extension direction of the connecting portion 2221c to intersect with the extension direction of the root portion 2221a, the sub-tab 2221 is a locally bent structure, so as to increase the area of the connecting portion 2221c in the sub-tab 2221 for connecting with the electrode terminal 23, and to improve the connection stability and the overcurrent capacity between the tab 222 and the electrode terminal 23.

[0319] According to some embodiments of the present application, referring to FIGS. 8, 9 and 10, the root portion 2221a is provided with a reinforcing portion 2221d on at least one side in the thickness direction thereof.

[0320] The root portion 2221a can be provided with the reinforcing portion 2221d on only one side in the thickness direction thereof, or can be provided with the reinforcing portion 2221d on both sides, and exemplarily, the root portion 2221a is provided with the reinforcing portion 2221d on both sides in the thickness direction thereof.

[0321] It should be noted that the structure of the reinforcing portion 2221d can be various. In the embodiment in which the reinforcing portion 2221d is arranged on the root 2221a of the first sub-tab 2232 on the first tab 223 and the first tab 223 is a negative tab, the reinforcing portion 2221d can be a structure in which the negative active material layer of the first tab 223 extends to the root 2221a of the first sub-tab 2232. Of course, the reinforcing portion 2221d can also be a ceramic layer coated on the root 2221a, and can also be a tape or plastic strip bonded to the root 2221a. In the embodiment in which the reinforcing portion 2221d is arranged on the root 2221a of the second sub-tab 2252 on the second tab 225 and the second tab 225 is a positive tab, the reinforcing portion 2221d can be a structure in which the second insulating layer in the second coating layer of the second tab 225 extends to the root 2221a of the second sub-tab 2252. Of course, the reinforcing portion 2221d can also be a ceramic layer coated on the root 2221a, and can also be a tape or plastic strip bonded to the root 2221a.

[0322] In some embodiments, referring to FIGS. 8 and 10, the reinforcing portion 2221d is connected to the main body portion 221 at one end of the main body portion 221 in the thickness direction X of the wall portion. Correspondingly, if the reinforcing portion 2221d is arranged on the first tab 223, the reinforcing portion 2221d is a structure connected to the first tab main body 2231 of the first tab 223. If the reinforcing portion 2221d is arranged on the second tab 225, the reinforcing portion 2221d is a structure connected to the second tab main body 2251 of the second tab 225.

[0323] In the embodiment in which the electrode assembly 22 further includes the separator 224, the separator 224 extends beyond the first tab main body 2231 of the first tab 223 and the second tab main body 2251 of the second tab 225 to be close to one end of the wall portion 211 in the thickness direction X of the wall portion. Correspondingly, one end of the reinforcing portion 2221d is located in the separator 224, and the other end of the reinforcing portion 2221d extends beyond the separator 224 to be close to one end of the wall portion 211 in the thickness direction X of the wall portion.

[0324] In the present embodiment, the reinforcing portion 2221d is arranged on at least one side of the root 2221a in the thickness direction thereof, so that the structural strength of the root 2221a can be improved by the reinforcing portion 2221d, thereby reducing the risk of deformation or cracking of the root 2221a during use.

[0325] According to some embodiments of the present application, referring to FIG. 10, the thickness of the reinforcing portion 2221d in the thickness direction of the root 2221a is D2, which satisfies 10 um≤D2≤80 um.

[0326] Exemplarily, the thickness D2 of the reinforcing portion 2221d can be 10 um, 12 um, 15 um, 18 um, 20 um, 25 um, 30 um, 35 um, 40 um, 45 um, 50 um, 55 um, 60 um, 65 um, 70 um, 75 um, or 80 um, etc.

[0327] It should be noted that if the reinforcing portion 2221d is arranged on the root 2221a of the first sub-tab 2232 of the first tab 223, the thickness of the reinforcing portion 2221d is less than or equal to the thickness of the first coating layer of the first tab 223; if the reinforcing portion 2221d is arranged on the root 2221a of the second sub-tab 2252 of the second tab 225, the thickness of the reinforcing portion 2221d is less than or equal to the thickness of the second coating layer of the second tab 225.

[0328] In this embodiment, by setting the thickness of the reinforcing portion 2221d in the thickness direction of the root 2221a to 10 um to 80 um, on the one hand, the thickness of the reinforcing portion 2221d in the thickness direction of the root 2221a is greater than or equal to 10 um, which is beneficial to improve the structural strength of the reinforcing portion 2221d, so as to improve the effect of the reinforcing portion 2221d on the structural strength of the root 2221a, and on the other hand, the thickness of the reinforcing portion 2221d in the thickness direction of the root 2221a is less than or equal to 80 um, which is beneficial to alleviate the phenomenon that the reinforcing portion 2221d occupies too much space or interferes with other components.

[0329] In some embodiments, please continue to refer to FIG. 10, along the thickness direction of the root 2221a, the thickness of the reinforcing portion 2221d is D2, which satisfies 30 um≤D2≤80 um.

[0330] In this embodiment, by further setting the thickness of the reinforcing portion 2221d in the thickness direction of the root 2221a to be greater than or equal to 30 um, the structural strength of the reinforcing portion 2221d is further improved, so as to further improve the effect of the reinforcing portion 2221d on the structural strength of the root 2221a.

[0331] According to some embodiments of the present application, referring to FIGS. 3 and 4, the shell 21 is cylindrical, and the central axis of the shell 21 extends along the thickness direction X of the wall portion.

[0332] Among them, the shell body 212 of the shell 21 is cylindrical, and correspondingly, the end cover 213 is a circular plate structure.

[0333] It should be noted that in other embodiments, the shape of the shell 21 can also be cuboid, square or prism, etc.

[0334] In the embodiment, the shell 21 is provided in a cylindrical shape to facilitate the processing of the battery cell 20 in a cylindrical structure, so that the battery cell 20 has advantages of high capacity, long cycle life, wide use environment temperature, etc.

[0335] According to some embodiments of the present application, referring to FIGS. 3, 4 and 5, the shell 21 can include a housing 212 and an end cover 213, the housing 212 has an accommodating cavity with an opening 2121 formed inside, the electrode assembly 22 is accommodated in the accommodating cavity, and the end cover 213 closes the opening 2121, and the end cover 213 is the wall portion 211.

[0336] In the embodiment, the end cover 213 is the wall portion 211, that is, the electrode terminal 23 is insulated and mounted on the end cover 213 of the shell 21, and correspondingly, the first tab 222a and the second tab 222b of the electrode assembly 22 are arranged on one end of the main body portion 221 of the electrode assembly 22 facing the end cover 213 in the thickness direction X of the wall portion, and the first insulating member 24 is located on the side of the end cover 213 away from the electrode assembly 22.

[0337] In the embodiment, by providing 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 cell 20 adopting such a structure facilitates the assembly of the electrode terminal 23 and the first insulating member 24 on the end cover 213, and can reduce the difficulty of the electrical connection between the electrode terminal 23 and the tab 222, thereby facilitating the reduction of the manufacturing difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0338] It should be noted that the structure of the battery cell 20 is not limited thereto, and in some embodiments, the battery cell 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 a bottom wall, the side wall is arranged around the bottom wall, and along the thickness direction X of the wall portion, one end of the side wall is connected to the bottom wall, and the other end encloses the opening 2121, the side wall and the bottom wall jointly define the accommodating cavity, the electrode assembly 22 is accommodated in the accommodating cavity, the end cover 213 closes the opening 2121, and the bottom wall is the wall portion 211.

[0339] In the embodiment, the housing 212 includes an integrally formed side wall and a bottom wall, that is, the housing 212 is processed by an integrally forming process, such as stamping, casting or extrusion forming, etc., that is, the side wall and the bottom wall of the housing 212 are of an integral structure.

[0340] The bottom wall is the wall portion 211, that is, the wall portion 211 is a wall of the shell 212 arranged opposite to the end cover 213 in the thickness direction X of the wall portion. Correspondingly, the electrode terminal 23 is insulatedly mounted on the bottom wall of the shell 212, and the first and second tabs 222a and 222b of the electrode assembly 22 are arranged on one end of the main body portion 221 of the electrode assembly 22 facing the bottom wall of the shell 212 in the thickness direction X of the wall portion.

[0341] In the embodiment, by arranging the wall portion 211 of the shell 21 as the bottom wall of the shell 212 arranged opposite to the end cover 213, the wall portion 211 provided with the electrode terminal 23 can be away from the end cover 213, so that the phenomenon that the stress generated by the pulling or twisting of other components on the electrode terminal 23 is transmitted to the connection position of the end cover 213 and the shell 212 can be relieved, and the risk of connection failure of the end cover 213 and the shell 212 can be reduced, so as to improve the use stability and reliability of the battery monomer 20.

[0342] According to some embodiments of the present application, the present application also provides a battery 100, which comprises the battery monomer 20 of any of the above schemes.

[0343] As shown in FIG. 2, the battery 100 can further comprise a box body 10, and the battery monomer 20 is contained in the box body 10.

[0344] 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 covered with each other, and the first box body 11 and the second box body 12 jointly define an assembly space for containing the battery monomer 20.

[0345] 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, 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.

[0346] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid. Exemplarily, in FIG. 2, the box body 10 is a cuboid structure.

[0347] 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 100, and the multiple battery cells 20 can be in series connection, parallel connection or mixed connection, where the mixed connection means that the multiple battery cells 20 are in both series connection and parallel connection. The multiple battery cells 20 can be directly connected in series, parallel or mixed connection, and the whole of the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be that the multiple battery cells 20 are first connected in series, parallel or mixed connection to form a battery module, and the multiple battery modules are connected in series, parallel or mixed connection to form a whole, which is accommodated in the box 10.

[0348] The battery 100 can further include other structures, for example, the battery 100 can further include a busbar component connected to the multiple battery cells 20 to realize electrical connection between the multiple battery cells 20.

[0349] It should be noted that in some embodiments, the battery 100 can also not be provided with the box 10, and the battery 100 includes the multiple battery cells 20, and the battery 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 longitudinal beam of the vehicle 1000.

[0350] 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.

[0351] The electric device can be any of the devices or systems to which the battery cell 20 is applied.

[0352] 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.

[0353] The above is only the preferred embodiments of the present application and is not used to limit the present application. The present application can have various changes and modifications for those skilled in the art. 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, the electrode assembly including a main body portion and two tabs of opposite polarity, the two tabs being a first tab and a second tab respectively, the first tab and the second tab are both arranged at an end of the main body portion close to the wall portion in a thickness direction of the wall portion; two electrode terminals, each insulatedly mounted on the wall portion, and each electrically connected to the first tab and the second tab respectively, the electrode terminals including a connecting piece on a side of the wall portion away from the electrode assembly, the connecting pieces of the two electrode terminals being a first connecting piece and a second connecting piece respectively; and a first insulating piece arranged on a side of the wall portion away from the electrode assembly in the thickness direction of the wall portion; wherein the first connecting piece and the second connecting piece are both arranged on the first insulating piece and are spaced apart, and in the thickness direction of the wall portion, a part of the first insulating piece is between the first connecting piece and the wall portion and a part of the first insulating piece is between the second connecting piece and the wall portion.

2. The battery cell of claim 1, wherein, In the thickness direction of the wall portion, a side of the first insulating piece away from the wall portion is provided with a fitting groove, and the first connecting piece and the second connecting piece are arranged in the fitting groove.

3. The battery cell of claim 2, wherein, The fitting groove is provided with a first partition portion arranged between the first connecting piece and the second connecting piece, and the first partition portion is configured to insulate and separate the first connecting piece and the second connecting piece.

4. The battery cell of claim 3, wherein, The first partition portion is arranged on a groove bottom surface of the fitting groove, and opposite ends of the first partition portion in a direction perpendicular to the thickness direction of the wall portion are both connected to groove side surfaces of the fitting groove, so as to divide the fitting groove into two accommodation grooves; wherein the first connecting piece and the second connecting piece are arranged in the two accommodation grooves respectively.

5. The battery cell of claim 3 or 4, wherein, In the thickness direction of the wall portion, the connecting piece has a first surface away from the wall portion, and the first partition portion has a second surface away from the wall portion; wherein the first surface and the second surface are coplanar; or the first surface is closer to the wall portion than the second surface in the thickness direction of the wall portion.

6. The battery cell of any one of claims 3-5, wherein, The first partition portion is integrally formed with the first insulating piece.

7. The battery cell of any one of claims 2-6, wherein, In the thickness direction of the wall portion, the connecting piece extends out of the fitting groove.

8. The battery cell of any one of claims 1-7, wherein, In the direction perpendicular to the thickness direction of the wall portion, the minimum distance between the first connecting piece and the second connecting piece is D1, and D1≥1.5 mm.

9. The battery cell of claim 8, wherein, D1≥3 mm.

10. The battery cell of claim 9, wherein, 4 mm≤D1≤8 mm.

11. The battery cell of any one of claims 1-10, wherein, In the thickness direction of the wall portion, the connecting piece has a first surface away from the wall portion, and an edge of the first surface includes a first edge, and the first edge is a circular arc shape.

12. The battery cell of claim 11, wherein, In the same plane perpendicular to the thickness direction of the wall portion, the wall portion is projected as a circle, and the projection of the wall portion and the projection of the first edge are concentrically arranged.

13. The battery cell of claim 11 or 12, wherein, The first connecting member and the second connecting member are oppositely arranged along a first direction, and the first surface has a first region and a second region arranged along a second direction and connected to each other, the first direction, the second direction and the thickness direction of the wall portion being perpendicular to each other; The edge of the first region includes the first edge, the second region has a rectangular orthographic projection in a plane perpendicular to the thickness direction of the wall portion, the edge of the second region includes a second edge extending along the second direction, and the second edge is connected to and tangent to the first edge.

14. The battery cell of claim 13, wherein, The first region further includes a third edge, and the second region further includes a fourth edge oppositely arranged to the second edge along the first direction, the third edge connecting the fourth edge and the first edge, and the fourth edge and the third edge being arranged in a same line.

15. The battery cell of any one of claims 1-14, wherein, The wall portion is provided with two mounting holes penetrating through both sides of the wall portion along the thickness direction of the wall portion, and the electrode terminals correspond to the mounting holes one by one. The electrode terminal further includes a terminal body arranged in the mounting hole along the thickness direction of the wall portion and connected to the connecting member, and the terminal body is electrically connected to the tab.

16. The battery cell of claim 15, wherein, Along the thickness direction of the wall portion, two protrusions are arranged on the side of the first insulating member facing the wall portion, each of the protrusions is arranged in one of the mounting holes, and the protrusions are located between the terminal body and the hole wall surface of the mounting hole to insulate and separate the wall portion and the terminal body.

17. The battery cell of claim 16, wherein, The protrusions surround the terminal body.

18. The battery cell of any one of claims 15-17, wherein, The battery monomer further includes two sealing members corresponding to the electrode terminals, the sealing members are arranged between the terminal body and the wall portion, and the sealing members are configured to seal the gap between the terminal body and the hole wall surface of the mounting hole.

19. The battery cell of any one of claims 15-18, wherein, The outer circumferential surface of the terminal body is provided with a first clamping portion, and along the thickness direction of the wall portion, the first clamping portion abuts against the connecting member to limit the connecting member from moving away from the wall portion.

20. The battery cell of claim 19, wherein, The connecting member is provided with a connecting hole penetrating through the connecting member along the thickness direction of the wall portion, the connecting hole includes a first hole section and a second hole section arranged along the thickness direction of the wall portion, the hole diameter of the first hole section is larger than that of the second hole section, the first hole section is located at the end of the second hole section away from the wall portion, and the hole wall surface of the first hole section and the hole wall surface of the second hole section are connected by a step surface; The terminal body is arranged in the connecting hole along the thickness direction of the wall portion, and at least part of the first clamping portion is located in the first hole section, and the first clamping portion abuts against the step surface in the thickness direction of the wall portion.

21. The battery cell of claim 20, wherein, The connecting member has a first surface facing away from the wall portion in the thickness direction of the wall portion, and the connecting hole penetrates through the first surface; Along the thickness direction of the wall portion, one end of the terminal body arranged in the connecting hole does not protrude from the first surface.

22. The battery cell of any one of claims 19-21, wherein, The outer circumferential surface of the terminal body is further provided with a second clamping portion, which is located on the side of the wall portion facing the electrode assembly along the thickness direction of the wall portion, and at least part of the wall portion is located between the second clamping portion and the connecting piece.

23. The battery cell of any one of claims 1-22, wherein, The battery monomer further comprises: Two current collecting members are arranged between the wall portion and the body portion, and one of the current collecting members is connected to one of the electrode terminals and one of the tabs.

24. The battery cell of claim 23, wherein, The battery monomer further comprises: A second insulating member is arranged between the wall portion and the body portion; Among them, two current collecting members are arranged on the second insulating member, and the second insulating member is configured to insulate and separate the two current collecting members.

25. The battery cell of claim 24, wherein, Part of the current collecting member is embedded in the second insulating member.

26. The battery cell of claim 25, wherein, The current collecting member comprises a first part, a second part and a third part, the first part and the second part are arranged opposite along the thickness direction of the wall portion, and the third part connects the first part and the second part; Among them, part of the first part is embedded in the second insulating member, and the first part is connected to the tab, and the second part is located on the side of the second insulating member away from the body portion in the thickness direction of the wall portion, and the second part is connected to the electrode terminal.

27. The battery cell of claim 26, wherein, The second insulating member comprises a mounting portion and a second separation portion, part of the first part is embedded in the mounting portion, the second separation portion is arranged on the side of the mounting portion facing the wall portion in the thickness direction of the wall portion, and the second separation portion is located between the second parts of the two current collecting members, and the second separation portion is configured to insulate and separate the second parts of the two current collecting members.

28. The battery cell of claim 26 or 27, wherein, The second part is provided with a through hole, and the through hole penetrates through both sides of the second part along the thickness direction of the wall portion; Among them, along the thickness direction of the wall portion, the electrode terminal is arranged in the through hole.

29. The battery cell of any one of claims 23-28, wherein, The battery monomer further comprises: A third insulating member is arranged between the wall portion and the current collecting member, and the third insulating member is configured to insulate and separate the current collecting member and the wall portion.

30. The battery cell of any one of claims 1-29, wherein, The electrode assembly comprises first and second polar plates with opposite polarities, the first polar plate has a first polar plate body and a first sub-tab connected to one end of the first polar plate body close to the wall portion in the thickness direction of the wall portion, the second polar plate has a second polar plate body and a second sub-tab connected to one end of the second polar plate body close to the wall portion in the thickness direction of the wall portion, all the first sub-tabs in the electrode assembly form the first tab, all the second sub-tabs in the electrode assembly form the second tab, and the body portion comprises the first and second polar plate bodies; Among them, along the thickness direction of the wall portion, the second polar plate body has a first end away from the wall portion, and the first polar plate body exceeds the first end.

31. The battery cell of claim 30, wherein, Along the thickness direction of the wall portion, the first polar plate body has an exceeding area exceeding the first end, and the length of the exceeding area is L, which satisfies 1.5mm≤L≤5mm.

32. The battery cell of claim 31, wherein, 2.5mm ≤ L ≤ 5mm.

33. The battery cell of any one of claims 30-32, wherein, The first tab is a negative tab, and the second tab is a positive tab.

34. The battery cell of any one of claims 1-33, wherein, The tab includes a plurality of sub-tabs, each of the sub-tab including a root, a bending portion, and a connecting portion, the root being connected to the main body portion, the bending portion connecting the root and the connecting portion, and the connecting portion being electrically connected to the electrode terminal. The root extends along a thickness direction of the wall portion, and the connecting portion extends in a direction intersecting the extending direction of the root.

35. The battery cell of claim 34, wherein, The root is provided with a reinforcing portion on at least one side thereof in the thickness direction.

36. The battery cell of claim 35, wherein, The reinforcing portion has a thickness D2 in the thickness direction of the root, and 10um ≤ D2 ≤ 80um is satisfied.

37. The battery cell of claim 36, wherein, 30um ≤ D2 ≤ 80um.

38. The battery cell of any one of claims 1-37, wherein, The housing is cylindrical, and a central axis of the housing extends along a thickness direction of the wall portion.

39. The battery cell of any one of claims 1-38, wherein, The housing includes: a housing body having an accommodating cavity with an opening formed therein, the electrode assembly being accommodated in the accommodating cavity; an end cover closing the opening; wherein the end cover is the wall portion.

40. The battery cell of any one of claims 1-38, wherein, The housing includes: a housing body including an integrally formed side wall and a bottom wall, the side wall being arranged around the bottom wall, one end of the side wall being connected to the bottom wall along a thickness direction of the wall portion, and the other end of the side wall being closed to form an opening, the side wall and the bottom wall together defining an accommodating cavity, the electrode assembly being accommodated in the accommodating cavity; an end cover closing the opening; wherein the bottom wall is the wall portion.

41. A battery including the battery cell according to any one of claims 1-40.

42. An electric device including the battery cell according to any one of claims 1-40, the battery cell being used to provide electric energy.

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