Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly, two electrode terminals and a first insulating part, the housing has a wall portion. The electrode assembly is accommodated in the shell, the electrode assembly comprises a main body part and two tabs with opposite polarities, and the two tabs are arranged at one end, close to the wall part, of the main body part in the thickness direction of the wall part. The two electrode terminals are both installed on the wall part in an insulating mode, the two electrode terminals are electrically connected with the two tabs respectively, and each electrode terminal comprises a connecting piece located on the side, away from the electrode assembly, of the wall part. The first insulating part is arranged on the side, away from the electrode assembly, of the wall part, the connecting parts of the two electrode terminals are arranged on the first insulating part at intervals, and at least part of the first insulating part is located between the connecting parts and the wall part. Therefore, the two electrode terminals share the first insulating part, the assembly process of the battery monomer can be optimized, and the short circuit risk of the battery monomer in the use process can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. As core components of new energy vehicles, batteries have high requirements for operational reliability. A battery cell typically includes a housing and an electrode assembly housed within the housing. To enable the input or output of electrical energy from the battery cell, the housing is typically provided with electrode terminals for electrical connection to the electrode assembly. However, existing battery cells are prone to risks such as short circuits during use, resulting in low reliability. Utility Model Content

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

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly, two electrode terminals and a first insulating member; the shell has a wall portion; the electrode assembly is accommodated in the shell, the electrode assembly comprises a main body portion and two pole tabs with opposite polarities, the two pole tabs are respectively a first pole tab and a second pole tab, the first pole tab and the second pole tab are both 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 insulated and mounted on the wall portion, and the two electrode terminals are electrically connected to the first pole tab and the second pole tab respectively, the electrode terminal comprises a connector located on a side of the wall portion away from the electrode assembly, the connectors of the two electrode terminals are respectively a first connector and a second connector; the first insulating member is arranged on a side of the wall portion away from the electrode assembly along the thickness direction of the wall portion; wherein the first connector and the second connector are both arranged on the first insulating member and arranged at intervals, and along the thickness direction of the wall portion, a portion of the first insulating member is located between the first connector and the wall portion and a portion of the first insulating member is located between the second connector and the wall portion.

[0005] In the above technical solution, the two electrode terminals are insulated and installed on the wall, the two electrode terminals are electrically connected to the first pole ear and the second pole ear respectively, and the connectors of the two electrode terminals are both arranged on the first insulating member and spaced apart, so that the electric energy of the battery cell can be coordinated to be input or output through the two electrode terminals. The battery cell adopting this structure can realize that the first connector and the second connector share the first insulating member, thereby reducing the difficulty of assembling the battery cell and optimizing the assembly process of the battery cell, which is beneficial to improving the production efficiency of the battery cell. On the other hand, during the use of the battery cell, the outer shell can be uncharged to alleviate the phenomenon of insufficient creepage distance between the outer shell and the electrode terminals, which is beneficial to reducing the risk of short circuit or leakage between the battery cell and other components. While the first connector and the second connector are insulated and isolated from the wall by the first insulating member, the first connector and the second connector can also be separated to reduce the risk of short circuit between the first connector and the second connector, which is beneficial to improving the reliability of use.

[0006] In some embodiments, along the thickness direction of the wall portion, a mounting groove is provided on a side of the first insulating member facing away from the wall portion, and the first connecting member and the second connecting member are spaced apart and arranged in the mounting groove.

[0007] In the above technical solution, by providing an assembly groove on the side of the first insulating part away from the wall portion, and the first connecting part and the second connecting part are both provided in the assembly groove, on the one hand, the difficulty of providing the first connecting part and the second connecting part on the first insulating part can be reduced, and the assembly stability between the first connecting part and the first insulating part and the second connecting part and the first insulating part can be improved. On the other hand, the first connecting part and the second connecting part can be accommodated in the assembly groove, which is conducive to further improving the effect of the first insulating part in insulating and isolating the first connecting part and the shell, and the second connecting part and the shell.

[0008] In some embodiments, a first partition is provided in the assembly groove, the first partition is provided between the first connector and the second connector, and the first partition is configured to insulate and isolate the first connector and the second connector.

[0009] In the above technical solution, by arranging a first partition in the assembly groove of the first insulating part, and the first partition is located between the first connector and the second connector, the first partition can insulate and separate the connectors of the two electrode terminals. The battery cell adopting this structure can, on the one hand, realize the physical separation between the first connector and the second connector arranged in the assembly groove, so that the overlap between the first connector and the second connector can be reduced during the use of the battery cell, and the short circuit between the first connector and the second connector caused by impurities falling between the connectors of the two electrode terminals can be alleviated. On the other hand, the creepage distance between the first connector and the second connector can be increased, thereby further reducing the risk of short circuit of the battery cell during use.

[0010] In some embodiments, the first partition portion is arranged on the bottom surface of the assembly groove, and the opposite ends of the first partition portion in a direction perpendicular to the thickness direction of the wall portion are connected to the groove side surfaces of the assembly groove to divide the assembly groove into two accommodating grooves; wherein the first connecting member and the second connecting member are respectively arranged in the two accommodating grooves.

[0011] In the above technical solution, by connecting the first partition part to the bottom surface of the assembly groove, and the two opposite ends of the first partition part in the direction perpendicular to the thickness direction of the wall part are connected to the groove side surfaces of the assembly groove, 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 the first partition part in insulating and isolating the first connecting part and the second connecting part, which is beneficial to reducing the risk of short circuit between the first connecting part and the second connecting part during use.

[0012] 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 the first partition portion has a second surface facing away from the wall portion; wherein the first surface is coplanar with the second surface; or, the first surface is closer to the wall portion than the second surface in the thickness direction of the wall portion.

[0013] 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.

[0014] In some embodiments, the first partition part is integrally formed with the first insulating piece.

[0015] 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.

[0016] In some embodiments, the connecting piece extends out of the assembly groove in the thickness direction of the wall part.

[0017] 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.

[0018] 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.

[0019] 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, and improving the electrical clearance between the first connecting piece and the second connecting piece, thereby reducing the risk of overlap between the first connecting piece and the second connecting piece.

[0020] In some embodiments, along a direction perpendicular to the thickness direction of the wall portion, a minimum distance between the first connecting member and the second connecting member is D1, satisfying D1 ≥ 3 mm.

[0021] In the above technical solution, by further setting the minimum distance between the first connector and the second connector in the direction perpendicular to the thickness direction of the wall to be greater than or equal to 3 mm, the creepage distance between the first connector and the second connector is further increased, thereby effectively alleviating the phenomenon of insufficient electrical clearance between the first connector and the second connector when the battery cell is used in high-altitude areas, and effectively alleviating the phenomenon of impurities falling between the first connector and the second connector and causing a short circuit between the first connector and the second connector, thereby reducing the risk of short circuit between the first connector and the second connector.

[0022] In some embodiments, along a direction perpendicular to the thickness direction of the wall portion, a minimum distance between the first connecting member and the second connecting member is D1, satisfying 4 mm ≤ D1 ≤ 8 mm.

[0023] In the above technical solution, by further setting the minimum distance between the first connector and the second connector in a direction perpendicular to the thickness of the wall to be greater than or equal to 4 mm, the creepage distance between the first connector and the second connector is further increased, thereby further alleviating the phenomenon of insufficient electrical clearance between the first connector and the second connector when the battery cell is used in high-altitude areas. It can also further alleviate the phenomenon of impurities falling between the first connector and the second connector causing a short circuit between the first connector and the second connector, thereby further reducing the risk of short circuit between the first connector and the second connector. In addition, by setting the minimum distance between the first connector and the second connector in a direction perpendicular to the thickness of the wall to be less than or equal to 8 mm, the phenomenon of excessive spacing between the first connector and the second connector causing the first connector and the second connector to occupy too much space is alleviated, and the difficulty of assembling the first connector and the first insulating member, and the second connector and the first insulating member, can be reduced.

[0024] 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 arc-shaped.

[0025] In the above technical solution, by setting the first edge of the first surface of the connecting member to a circular arc structure, at least part of the edge of the first surface of the connecting member is a circular arc structure, thereby improving the smoothness of the edge of the first surface of the connecting member and alleviating the collision between the connecting member and other components.

[0026] In some embodiments, in a same plane perpendicular to a thickness direction of the wall portion, an orthographic projection of the wall portion is circular, and the orthographic projection of the wall portion and the orthographic projection of the first edge are concentrically arranged.

[0027] In the above technical solution, by setting the projection of the wall portion in the thickness direction of the wall portion to be circular, 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 to be concentrically arranged, the shapes of the first edge and the edge of the wall portion fit each other. The battery cell adopting this structure can maximize the space utilization of the first surface of the connector on the wall portion, which is beneficial to increase the area of ​​the first surface of the connector, so that when the battery cells are subsequently assembled into groups, the area of ​​the first surface of the connector used for connection with the convergence component can be increased, which is beneficial to improve the flow capacity between the connector and the convergence component.

[0028] In some embodiments, the first connecting member and the second connecting member are arranged opposite to each other and spaced apart along a first direction, the first surface has a first area and a second area arranged and connected along a second direction, and the first direction, the second direction and the thickness direction of the wall portion are perpendicular to each other; wherein, the edge of the first area includes the first edge, and in a plane perpendicular to the thickness direction of the wall portion, the positive projection of the second area is a rectangle, and the edge of the second area includes the second edge, and the second edge is connected to and tangent to the first edge.

[0029] In the above technical solution, the first connector and the second connector are arranged opposite to each other and spaced apart along the first direction. By setting the first surface as the first area and the second area arranged and connected along the second direction, and setting the second edge of the second area to a structure connected to and tangent to the first edge of the first area, the battery cell with this structure can, on the one hand, optimize the spatial layout of the first connector and the second connector to improve the space utilization of the connector on the wall, and on the other hand, further increase the area of ​​the first surface, so that when the battery cells are subsequently assembled into groups, the area of ​​the first surface of the connector for connection with the busbar component can be further increased.

[0030] In some embodiments, the first area further includes a third edge, the second area further includes a fourth edge, the fourth edge and the second edge are arranged opposite to each other 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 collinearly.

[0031] 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, the manufacturing difficulty of the connecting piece of the electrode terminal is reduced, and the spatial layout of the first connecting piece and the second connecting piece is further optimized, so that the space utilization of the connecting piece on the wall portion is further improved.

[0032] In some embodiments, two mounting holes are arranged on the wall portion, the mounting holes penetrate through both sides of the wall portion along the thickness direction of the wall portion, and the electrode terminal corresponds 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 portion and connected with the connecting piece, and the terminal body is electrically connected with the tab.

[0033] 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 portion along the thickness direction of the wall portion, so that one end of the terminal body is located on the side of the wall portion 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 portion 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.

[0034] In some embodiments, two protrusions are arranged on the side of the first insulating piece facing the wall portion along the thickness direction of the wall portion, each protrusion is arranged in a 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 portion and the terminal body.

[0035] In the technical scheme, the protrusion is arranged on the side of the first insulating piece facing the wall portion, the protrusion is arranged in the corresponding mounting hole along the thickness direction of the wall portion, 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 portion, and on the other hand, the protrusion can also 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 portion.

[0036] In some embodiments, the protrusion surrounds the terminal body.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In the technical solution, the first clamping portion is arranged 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, so as to realize the assembly and fixation of the connecting piece on the wall portion, which is simple in structure and convenient to assemble.

[0042] 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 comprises a first hole section and a second hole section arranged in the thickness direction of the wall portion, the hole diameter of the first hole section is greater than the hole diameter of the second hole section, the first hole section is 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 are 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.

[0043] In the above technical solution, a connecting hole is provided on the connecting member which passes through the connecting member along the thickness direction of the wall portion, and the connecting hole is a stepped hole structure including a first hole segment and a second hole segment 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 segment and the hole wall surface of the second hole segment, so that the terminal body and the connecting member can be assembled by inserting the terminal body into the connecting hole and abutting the first clamping portion against the step surface. The structure is simple, easy to implement, and has high stability.

[0044] In some embodiments, the connector has a first surface facing away from the wall portion in the thickness direction of the wall portion, and the connecting hole passes through the first surface; wherein, along the thickness direction of the wall portion, one end of the terminal body inserted in the connecting hole does not protrude from the first surface.

[0045] In the above technical solution, by setting one end of the terminal body inserted in the connecting hole not to protrude from the first surface in the thickness direction of the wall, so that the one end of the terminal body inserted in the connecting hole does not extend out of the end of the connecting hole passing through the first surface, on the one hand, the interference between the terminal body and the busbar component can be reduced when the battery cells are subsequently assembled into groups, and on the other hand, the phenomenon of the terminal body being worn or bumped can be reduced.

[0046] In some embodiments, a second clamping portion is also protruding from the outer peripheral surface of the terminal body. Along 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 member.

[0047] In the above technical solution, a second clamping portion is protruding from the outer peripheral surface of the terminal body, and the second clamping portion is located on the side of the wall portion facing the electrode assembly. By setting at least part of the wall portion to be located between the second clamping portion and the connecting piece, the second clamping portion and the connecting piece can cooperate to clamp and assemble the wall portion, so as to fasten the electrode terminal to the wall portion, thereby enabling the assembly between the electrode terminal and the wall portion to be achieved. The structure is simple, easy to implement, and has high stability.

[0048] In some embodiments, the battery cell further includes two current collecting members; the two current collecting members are both disposed between the wall portion and the main body portion, and one current collecting member is connected to one electrode terminal and one tab.

[0049] In the above technical solution, two current collecting components are provided between the wall portion and the main body portion, and each current collecting component is connected to an electrode terminal and a tab, thereby reducing the difficulty of electrical connection between the tab and the electrode terminal and improving the assembly efficiency of the battery cell.

[0050] In some embodiments, the battery cell further includes a second insulating member disposed between the wall portion and the main body portion; wherein the two current collecting members are spaced apart on the second insulating member, and the second insulating member is configured to insulate and isolate the two current collecting members.

[0051] In the above technical solution, by arranging a second insulating member between the wall portion and the main body, and arranging the two current collecting components on the second insulating member at intervals, the battery cell adopting this structure can, on the one hand, improve the stability of the two current collecting components arranged between the wall portion and the main body, which is beneficial to reducing the risk of shaking of the two current collecting components during use; on the other hand, the second insulating member can insulate and separate the two current collecting components to reduce the risk of short circuit between the two current collecting components, and the two current collecting components can also share the second insulating member, which is beneficial to reducing the difficulty of assembling the battery cell and optimizing the assembly process of the battery cell.

[0052] In some embodiments, a portion of the current collecting member is embedded in the second insulating member.

[0053] In the above technical solution, by partially embedding the current collecting component with the second insulating component, the structural stability and reliability of the current collecting component set on the second insulating component are improved, which is conducive to reducing the risk of short circuit between the current collecting component and other components after it is detached from the second insulating component.

[0054] In some embodiments, the current collecting component includes a first part, a second part and a third part, the first part and the second part are arranged opposite to each other along the thickness direction of the wall portion, and the third part connects the first part and the second part; wherein, part of the first part is embedded in the second insulating member, and the first part is connected to the pole ear, and the second part is located on the side of the second insulating member away from the main body in the thickness direction of the wall portion, and the second part is connected to the electrode terminal.

[0055] In the above technical solution, the current collecting component is provided with a first part, a second part and a third part. The first part and the second part are arranged opposite to each other along the thickness direction of the wall portion, and the third part connects the first part and the second part, so that the current collecting component is bent to form a structure similar to a "U" shape. By embedding the first part in the second insulating member and connecting it to the pole ear, and arranging the second part to be located on the side of the second insulating member facing the wall portion and connected to the electrode terminal, the battery cell adopting this structure can reduce the difficulty of connecting the current collecting component to the electrode terminal and the pole ear, which is conducive to improving the assembly efficiency of the battery cell.

[0056] In some embodiments, the second insulating member includes a mounting portion and a second partition portion, a portion of the first portion is embedded in the mounting portion, the second partition portion is arranged on a 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 components, and the second partition portion is configured to insulate and isolate the second portions of the two current collecting components.

[0057] In the above technical solution, the second insulating part is provided with a mounting portion and a second partitioning portion. By embedding the first part of the current collecting component in the mounting portion and setting the second partitioning portion to be located between the second parts of the two current collecting components, the mounting portion can fix and insulate the first parts of the two current collecting components while also playing the role of insulating and isolating the first parts of the two current collecting components through the second partitioning portion, which is beneficial to further enhance the effect of the second insulating part in insulating and isolating the two current collecting components, so as to reduce the risk of short circuit between the two current collecting components during use.

[0058] In some embodiments, the second portion is provided with a through hole, and the through hole penetrates both sides of the second portion along the thickness direction of the wall portion; wherein, along the thickness direction of the wall portion, the electrode terminal is provided in the through hole.

[0059] In the above technical solution, a through hole is provided on the second part of the current collecting component, which passes through the second part in the thickness direction of the wall portion, so that the electrode terminal can be inserted into the through hole, so that the second part can be sleeved on the outside of the electrode terminal, thereby further improving the connection stability and reliability between the electrode terminal and the second part of the current collecting component, and reducing the difficulty of assembling the electrode terminal and the second part of the current collecting component.

[0060] In some embodiments, the battery cell further includes a third insulating member; the third insulating member is disposed between the wall portion and the current collecting member, and the third insulating member is configured to insulate and isolate the current collecting member from the wall portion.

[0061] In the above technical solution, a third insulating member is provided between the wall and the current collecting member so that the third insulating member can insulate and isolate the current collecting member and the wall, thereby reducing the overlap between the current collecting member and the wall, thereby reducing the risk of short circuit of the battery cell during use.

[0062] In some embodiments, the electrode assembly includes a first electrode piece and a second electrode piece with opposite polarities, the first electrode piece having a first electrode piece body and a first sub-electrode ear, the first sub-electrode ear being connected to one end of the first electrode piece body close to the wall portion in the thickness direction of the wall portion, the second electrode piece having a second electrode piece body and a second sub-electrode ear, the second sub-electrode ear being connected to one end of the second electrode piece body close to the wall portion in the thickness direction of the wall portion, all the first sub-electrodes in the electrode assembly form the first electrode ear, and all the second sub-electrodes in the electrode assembly form the second electrode ear, and the main body includes the first electrode piece body and the second electrode piece body; wherein, along the thickness direction of the wall portion, the second electrode piece body has a first end away from the wall portion, and the first electrode piece body extends beyond the first end.

[0063] In the above technical solution, by setting the first pole piece body of the first pole piece to extend beyond the second pole piece body of the second pole piece at one end away from the wall, the main body of the electrode assembly has a smaller density at one end away from the wall in the thickness direction of the wall. On the one hand, this facilitates the electrolyte in the outer shell to enter the main body of the electrode assembly through capillary action, which is beneficial to improving the electrolyte infiltration effect of the electrode assembly, thereby improving the performance of the battery cell. On the other hand, when thermal runaway occurs in the battery cell, the exhaust smoothness inside the electrode assembly can be improved, which is beneficial to improving the pressure release rate of the battery cell.

[0064] In some embodiments, along the thickness direction of the wall portion, the first pole piece body has a protruding area beyond the first end, and the length of the protruding area is L, satisfying 1.5 mm ≤ L ≤ 5 mm.

[0065] In the above technical solution, by setting the length of the first pole piece body of the first pole piece exceeding the first end of the pole piece body of the second pole piece in the thickness direction of the wall to 1.5mm to 5mm, on the one hand, the length of the less dense area of ​​the main body of the electrode assembly away from one end of the wall in the thickness direction of the wall is greater than or equal to 1.5mm, thereby improving the effect of the electrolyte in the shell entering the main body of the electrode assembly through capillary action, so as to further improve the electrolyte infiltration effect of the electrode assembly, and further improve the exhaust smoothness inside the electrode assembly when thermal runaway occurs in the battery cell, which is beneficial to further improve the pressure release rate of the battery cell. On the other hand, by setting the length of the first pole piece body of the first pole piece exceeding the first end of the pole piece body of the second pole piece in the thickness direction of the wall to less than or equal to 5mm, the phenomenon of excessive waste of the first pole piece causing the energy density of the electrode assembly to be reduced is alleviated.

[0066] In some embodiments, along the thickness direction of the wall portion, the first pole piece body has a protruding area beyond the first end, and the length of the protruding area is L, satisfying 2.5 mm ≤ L ≤ 5 mm.

[0067] In the above technical solution, by further setting the length of the first pole piece body of the first pole piece exceeding the first end of the pole piece body of the second pole piece in the thickness direction of the wall to be greater than or equal to 2.5 mm, so that the length of the less dense area of ​​the main body of the electrode assembly away from one end of the wall in the thickness direction of the wall is greater than or equal to 2.5 mm, the effect of the electrolyte in the outer shell entering the main body of the electrode assembly through capillary action can be further improved, so as to further improve the infiltration effect of the electrolyte of the electrode assembly, and can further improve the exhaust smoothness inside the electrode assembly when thermal runaway occurs in the battery cell, which is conducive to further improving the pressure release rate of the battery cell.

[0068] In some embodiments, the first electrode is a negative electrode, and the second electrode is a positive electrode.

[0069] In the above technical solution, by setting the first electrode sheet as the negative electrode sheet and correspondingly setting the second electrode sheet as the positive electrode sheet, the negative electrode sheet is configured to extend beyond the end of the positive electrode sheet away from the wall in the thickness direction of the wall, thereby reducing the risk of ionic metal precipitation in the electrode assembly during use, thereby improving the stability and reliability of the battery cell.

[0070] In some embodiments, the electrode tab includes a plurality of sub-tabs, each of which includes a root, a bent portion, and a connecting portion, wherein the root is connected to the main body, the bent portion connects the root and the connecting portion, and the connecting portion is electrically connected to the electrode terminal; wherein the root extends along the thickness direction of the wall portion, and the extension direction of the connecting portion intersects with the extension direction of the root.

[0071] In the above technical solution, the pole lug is composed of multiple sub-pole lugs, and the sub-pole lug includes a root portion, a bending portion and a connecting portion connected in sequence. By setting the root portion to a structure extending along the thickness direction of the wall portion, and setting the extension direction of the connecting portion to intersect with the extension direction of the root portion, the sub-pole lug is a locally bent structure, thereby increasing the area of ​​the connecting portion in the sub-pole lug for interconnection with the electrode terminal, which is beneficial to improving the connection stability and current flow capacity between the pole lug and the electrode terminal.

[0072] In some embodiments, the root portion is provided with a reinforcement portion on at least one side thereof in a thickness direction.

[0073] In the above technical solution, a reinforcement portion is provided on at least one side of the root along its thickness direction, so that the structural strength of the root can be improved by the reinforcement portion, thereby reducing the risk of deformation or cracking of the root during use.

[0074] In some embodiments, along the thickness direction of the root portion, the thickness of the reinforcement portion is D2, satisfying 10um≤D2≤80um.

[0075] In the above technical solution, by setting the thickness of the reinforcement part in the thickness direction of the root to 10um to 80um, on the one hand, setting the thickness of the reinforcement part in the thickness direction of the root to be greater than or equal to 10um is beneficial to improving the structural strength of the reinforcement part, so as to enhance the effect of the reinforcement part in reinforcing the structural strength of the root; on the other hand, setting the thickness of the reinforcement part in the thickness direction of the root to be less than or equal to 80um is beneficial to alleviating the phenomenon that the reinforcement part occupies too much space or interferes with other components.

[0076] In some embodiments, along the thickness direction of the root portion, the thickness of the reinforcement portion is D2, satisfying 30um≤D2≤80um.

[0077] In the above technical solution, by further setting the thickness of the reinforcement part in the thickness direction of the root to be greater than or equal to 30um, it is beneficial to further improve the structural strength of the reinforcement part, so as to further improve the effect of the reinforcement part in reinforcing the structural strength of the root.

[0078] In some embodiments, the shell is cylindrical, and the central axis of the shell extends along the thickness direction of the wall portion.

[0079] In the above technical solution, the outer shell is set to be cylindrical to facilitate processing to form a cylindrical battery cell, so that the battery cell has the advantages of high capacity, long cycle life, and a wide range of operating ambient temperatures.

[0080] In some embodiments, the housing includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the electrode assembly is received in the receiving cavity; the end cover closes the opening; wherein the end cover is the wall portion.

[0081] In the above technical solution, by setting the wall portion of the shell as the end cover for closing the opening of the shell, the battery cell adopting this structure is convenient for assembling the electrode terminal and the first insulating member on the end cover, and can reduce the difficulty of electrically connecting the electrode terminal and the tab to each other, thereby helping to reduce the manufacturing difficulty of the battery cell and improve the production efficiency of the battery cell.

[0082] In some embodiments, the outer shell includes a shell and an end cover; the shell includes an integrally formed side wall and a bottom wall, the side wall is arranged around the bottom wall, and along the thickness direction of the wall portion, one end of the side wall is connected to the bottom wall, and the other end is enclosed to form an opening, the side wall and the bottom wall jointly define a accommodating cavity, and the electrode assembly is accommodated in the accommodating cavity; the end cover closes the opening; wherein, the bottom wall is the wall portion.

[0083] In the above technical solution, by setting the wall portion of the outer shell as the bottom wall arranged opposite to the shell and the end cover, the wall portion where the electrode terminal is arranged can be away from the end cover, thereby alleviating the phenomenon that the stress caused by pulling or twisting the electrode terminal by other components is transmitted to the connection position between the end cover and the shell, thereby reducing the risk of connection failure between the end cover and the shell, thereby improving the stability and reliability of the battery cell.

[0084] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0085] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0087] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0088] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0089] Figure 3 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0090] Figure 4 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0091] Figure 5 A cross-sectional view of a battery cell provided in some embodiments of the present application;

[0092] Figure 6 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0093] Figure 7 A front view of a battery cell provided in some embodiments of the present application facing the wall portion in the thickness direction of the wall portion;

[0094] Figure 8 A partial cross-sectional view of an electrode assembly provided in some embodiments of the present application;

[0095] Figure 9 A schematic diagram of the structure of the first electrode piece of the electrode assembly provided in some embodiments of the present application after unfolding;

[0096] Figure 10 A cross-sectional view of a first pole piece of an electrode assembly provided in some embodiments of the present application;

[0097] Figure 11 An exploded view of a local structure of a battery cell provided in some embodiments of the present application;

[0098] Figure 12 A schematic structural diagram of a first insulating member of a battery cell provided in some embodiments of the present application;

[0099] Figure 13 A cross-sectional view of an electrode terminal of a battery cell provided in some embodiments of the present application;

[0100] Figure 14 Schematic diagram of the assembly of the second insulating member and the current collecting member of the battery cell provided in some embodiments of the present application.

[0101] 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

[0102] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are 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 scope of protection of the present application.

[0103] 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".

[0104] Reference throughout this application 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 other embodiments.

[0105] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0106] In this application, the term "and / or", only describes the relationship between the associated objects, which means that there are three kinds of relationships, for example, A and / or B, which means that there are three kinds of situations, A alone, A and B together, and B alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0107] 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.

[0108] "Multiple" appearing in this application means two or more (including two).

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] By way of 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.

[0114] By way of example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a 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 polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0115] By way of example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and respective modified compounds thereof. 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 referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0116] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or the like. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0117] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0118] As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. may be used. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0119] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0120] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0121] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0122] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0123] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0124] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known separator membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0125] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0126] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0127] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0128] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0129] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0130] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0131] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0132] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0133] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0134] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0135] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0136] In some embodiments, the electrode assembly is a laminated structure.

[0137] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0138] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0139] As an example, the positive electrode sheet and the negative electrode sheet are each folded to form a plurality of folded sections which are stacked.

[0140] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode sheet or negative electrode sheet.

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

[0142] In some embodiments, the electrode assembly can have a shape of a cylinder, a flat, a polygonal prism, or the like.

[0143] 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.

[0144] In some embodiments, the battery cell can include a housing. The housing can be used to enclose the electrode assembly and other components such as 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.

[0145] 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, which can include, but are 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.

[0146] The battery referred to in the embodiments of the present application can refer to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0147] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the battery cells can be arranged and fixed to form a battery module.

[0148] In some embodiments, the battery can be a battery pack, which can include a box and battery cells, and the battery cells or battery modules can be contained in the box.

[0149] In some embodiments, the box can be part of the chassis structure of a vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] Based on the above considerations, in order to solve the problem of low reliability of battery cells, an embodiment of the present application provides a battery cell, which includes a housing, an electrode assembly, two electrode terminals, and a first insulating member. The housing has a wall portion. The electrode assembly is housed within the housing, and the electrode assembly includes a main body and two tabs with opposite polarities, the two tabs being a first tab and a second tab, each of which is disposed at one end of the main body near the wall portion in the thickness direction of the wall portion. The two electrode terminals are both insulated and mounted on the wall portion, and are electrically connected to the first tab and the second tab, respectively. The electrode terminals include a connector located on a side of the wall portion facing away from the electrode assembly, the connectors of the two electrode terminals being a first connector and a second connector, respectively. The first insulating member is disposed on a side of the wall portion facing away from the electrode assembly along the thickness direction of the wall portion. The first connector and the second connector are both disposed on the first insulating member and spaced apart from each other, with a portion of the first insulating member located between the first connector and the wall portion, and a portion of the first insulating member located between the second connector and the wall portion, along the thickness direction of the wall portion.

[0154] In a battery cell of this structure, the two electrode terminals are insulated and mounted on the wall, the two electrode terminals are electrically connected to the first pole ear and the second pole ear respectively, and the connectors of the two electrode terminals are both arranged on the first insulating member and spaced apart so that the electric energy of the battery cell can be coordinated to be input or output through the two electrode terminals. On the one hand, a battery cell with this structure can realize that the first connector and the second connector share the first insulating member, thereby reducing the difficulty of assembling the battery cell and optimizing the assembly process of the battery cell, which is beneficial to improving the production efficiency of the battery cell. On the other hand, during the use of the battery cell, the outer shell can be uncharged to alleviate the phenomenon of insufficient creepage distance between the outer shell and the electrode terminals, which is beneficial to reducing the risk of short circuit or leakage between the battery cell and other components. While the first connector and the second connector are insulated and isolated from the wall by the first insulating member, the first connector and the second connector can also be separated to reduce the risk of short circuit between the first connector and the second connector, which is beneficial to improving the reliability of use.

[0155] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to construct such electrical devices. This helps alleviate issues such as short circuits and leakage during battery cell use, thereby improving the reliability of the battery cells.

[0156] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0157] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0158] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0159] In some embodiments of the present application, the battery 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0160] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery 100 provided in some embodiments of the present application. Figure 3 The battery 100 includes a housing 10 and a battery cell 20 , wherein the battery cell 20 is accommodated in the housing 10 .

[0161] The housing 10 is used to provide assembly space for the battery cells 20 and can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 cover each other, and the first housing body 11 and the second housing body 12 jointly define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure. The first housing body 11 covers the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define the assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, and the open side of the first housing body 11 covers the open side of the second housing body 12.

[0162] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube. Figure 2 In the embodiment, the box body 10 is in the shape of a cuboid.

[0163] In the battery 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 10.

[0164] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20 .

[0165] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be in the shape of a cuboid, a cylinder, a prism, or other shapes. For example, Figure 3 In the figure, the battery cell 20 is a cylindrical structure.

[0166] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7 , Figure 4This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 5 A cross-sectional view of a battery cell 20 provided in some embodiments of the present application is provided. Figure 6 This is a front view of the battery cell 20 provided in some embodiments of the present application, facing the wall portion 211 in the thickness direction X of the wall portion. Figure 7 A front view of a battery cell 20 provided in 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 shell 21, an electrode assembly 22, two electrode terminals 23 and a first insulating member 24. The shell 21 has a wall portion 211. The electrode assembly 22 is accommodated in the shell 21, and the electrode assembly 22 includes a main body 221 and two pole tabs 222 with opposite polarities, the two pole tabs 222 are respectively a first pole tab 222a and a second pole tab 222b, and the first pole tab 222a and the second pole tab 222b are both arranged at one end of the main body 221 close to the wall portion 211 in the thickness direction X of the wall portion. Both electrode terminals 23 are insulated and mounted on the wall portion 211, and are electrically connected to the first electrode tab 222a and the second electrode tab 222b, respectively. The electrode terminals 23 include connectors 231 located on the side of the wall portion 211 facing away from the electrode assembly 22. The connectors 231 of the two electrode terminals 23 are respectively a first connector 231a and a second connector 231b. A first insulating member 24 is disposed along the wall portion's thickness direction X on the side of the wall portion 211 facing away from the electrode assembly 22. The first connector 231a and the second connector 231b are both disposed on the first insulating member 24 and spaced apart. Along the wall portion's thickness direction X, a portion of the first insulating member 24 is located between the first connector 231a and the wall portion 211, and a portion of the first insulating member 24 is located between the second connector 231b and the wall portion 211.

[0167] The housing 21 may also be used to contain electrolytes, such as electrolyte, etc. The housing 21 may also be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0168] In some embodiments, the housing 21 can be a sealed structure or a non-sealed structure. As an example, when the housing 21 is a sealed structure, the housing 21 can protect the electrode assembly 22 and prevent electrolyte leakage to a certain extent. When the housing 21 is a non-sealed structure, the housing 21 can also protect the electrode assembly 22. A sealing bag can be included between the housing 21 and the electrode assembly 22 to encapsulate the electrode assembly 22 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film.

[0169] Optionally, the outer shell 21 may include a shell 212 and an end cover 213, and a accommodating cavity is formed inside the shell 212, which is used to accommodate the electrode assembly 22, and the accommodating cavity has an opening 2121. That is, the shell 212 is a hollow structure with an opening 2121 at one end, and the end cover 213 covers the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0170] When assembling the battery cell 20 , the electrode assembly 22 may be placed into the housing 212 first, and the housing 212 may be filled with electrolyte. The end cap 213 may then be placed over the opening 2121 of the housing 212 to complete the assembly of the battery cell 20 .

[0171] The shell 212 can be in various shapes, such as a cylindrical or prismatic structure. The shape of the shell 212 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, a cylindrical shell 212 can be selected. Of course, the structure of the end cap 213 can also be various, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 3 and Figure 4 In the figure, the shell 212 is a cylindrical structure, the central axis of the shell 212 extends along the thickness direction X of the wall, the end cover 213 is a plate-like structure, and the orthographic projection of the end cover 213 in a plane perpendicular to the thickness direction X of the wall is circular.

[0172] It should be noted that the wall portion 211 for mounting the electrode terminal 23 may be the end cover 213 of the housing 21 or a wall of the shell 212. Figure 3 and Figure 4 In the figure, the wall portion 211 is the end cap 213 of the outer shell 21. Of course, the structure of the battery cell 20 is not limited thereto. In other embodiments, the shell 212 may include side walls and a bottom wall. The side walls are arranged around the bottom wall. Along the thickness direction X of the wall portion, the bottom wall and the end cap 213 are arranged opposite each other. One end of the side wall is connected to the bottom wall, and the other end is enclosed to form an opening 2121. The bottom wall may also be the wall portion 211 for mounting the electrode terminal 23.

[0173] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. Figure 4 and Figure 5 , and please refer to Figure 8 、 Figure 9 and Figure 10 , Figure 8 A partial cross-sectional view of an electrode assembly 22 provided in some embodiments of the present application is provided. Figure 9 This is a schematic structural diagram of the first electrode piece 223 of the electrode assembly 22 provided in some embodiments of the present application after being unfolded. Figure 10A cross-sectional view of the first tab 223 of the electrode assembly 22 is provided for some embodiments of the present application. The electrode assembly 22 can include the first tab 223, the separator 224, and the second tab 225, the first tab 223 and the second tab 225 having opposite polarities, and the separator 224 being disposed between the first tab 223 and the second tab 225 to separate the first tab 223 and the second tab 225.

[0174] Optionally, the electrode assembly 22 can have various structures. The electrode assembly 22 can be a wound structure formed by winding the first tab 223, the separator 224, and the second tab 225, or can be a stacked structure formed by stacking the first tab 223, the separator 224, and the second tab 225. For example, the electrode assembly 22 is a wound structure formed by winding the first tab 223, the separator 224, and the second tab 225, and the main body 221 of the electrode assembly 22 has a cylindrical shape, and the central axis of the main body 221 extends in the thickness direction X of the wall portion.

[0175] For example, 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.

[0176] For example, the first tab 223 includes the first tab main body 2231 and a plurality of first sub-tabs 2232, the plurality of first sub-tabs 2232 being connected to one end of the first tab main body 2231 near the wall portion 211 in the thickness direction X of the wall portion, the second tab 225 includes the second tab main body 2251 and a plurality of second sub-tabs 2252, the plurality of second sub-tabs 2252 being connected to one end of the second tab main body 2251 near the wall portion 211 in the thickness direction X of the wall portion, 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, 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, so that the electrode assembly 22 forms two tabs 222 having opposite polarities, i.e., the first tab 222a and the second tab 222b, and the first tab 222a and the second tab 222b respectively input or output the positive and negative electrodes of the electrode assembly 22.

[0177] The main body 221 is the area where the electrode assembly 22 undergoes a chemical reaction within the battery cell 20. The main body 221 is a structure formed by winding the first pole piece body 2231 of the first pole piece 223, the separator 224, and the second pole piece body 2251 of the second pole piece 225, so that the multiple first sub-pole tabs 2232 of the first pole piece 223 are located at one end of the main body 221 close to the wall 211 in the thickness direction X of the wall, and form a first pole tab 222a connected to the end of the main body 221 close to the wall 211. , and the multiple second sub-pole ears 2252 of the second pole piece 225 are located at one end of the main body 221 close to the wall portion 211 in the thickness direction X of the wall portion, and form a second pole ear 222b connected to the end of the main body 221 close to the wall portion 211, so as to realize that the first pole ear 222a and the second pole ear 222b with opposite polarities in the electrode assembly 22 are both arranged at the same end of the main body 221 in the thickness direction X of the wall portion, and are located at the end of the main body 221 facing the wall portion 211 in the thickness direction X of the wall portion.

[0178] In an embodiment of the present application, the first pole piece 223 includes a first current collector and a first coating layer arranged on at least one side of the first current collector, and the first sub-pole tab 2232 is a component of the area cut out of the first current collector and where the first coating layer is not provided. Similarly, the second pole piece 225 includes a second current collector and a second coating layer arranged on at least one side of the second current collector, and the second sub-pole tab 2252 is a component of the area cut out of the second current collector and where the second coating layer is not provided.

[0179] Optionally, the first electrode piece 223 can be a negative electrode piece, and correspondingly, the second electrode piece 225 is a positive electrode piece. Of course, the first electrode piece 223 can also be a positive electrode piece, and correspondingly, the second electrode piece 225 is a negative electrode piece. For example, the first electrode piece 223 is a negative electrode piece, and the first coating layer can be a negative electrode active material layer as a whole. Of course, in other embodiments, the first coating layer can also include a negative electrode active material layer and a first insulating layer, and the first insulating layer is arranged on the edge of the negative electrode active material layer in the thickness direction X of the wall portion close to the first sub-pole ear 2232. Correspondingly, the second electrode piece 225 is a positive electrode piece, and the second coating layer includes a positive electrode active material layer and a second insulating layer. The second insulating layer is arranged on the edge of the positive electrode active material layer in the thickness direction X of the wall portion close to the second sub-pole ear 2252. Of course, in other embodiments, the second coating layer can also be a positive electrode active material layer as a whole.

[0180] 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 poles of the battery monomer 20 through the two electrode terminals 23.

[0181] 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 Figure 6 , and further referring to Figure 11 , Figure 11 A partial structure explosion diagram of the battery monomer 20 is provided for some embodiments of the present application. Two mounting holes 2111 are arranged on the wall portion 211, 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, so that one end of the electrode terminal 23 facing the electrode assembly 22 in the thickness direction X of the wall portion can be electrically connected to one tab 222, and the other end can be electrically connected to the busbar component of the battery 100.

[0182] The electrode terminal 23 includes a connecting piece 231 located 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 located on the side of the wall portion 211 away from the electrode assembly 22 in the thickness direction X of the wall portion. The connecting piece 231 is a component of the electrode terminal 23 for connecting to the busbar component, that is, the electrode terminal 23 has a connecting piece 231 for connecting to the busbar component, and the connecting piece 231 is located on the side of the wall portion 211 away from the electrode assembly 22 in the thickness direction X of the wall portion. The surface of the connecting piece 231 away from the side of the wall portion 211 in the thickness direction X of the wall portion is a first surface 2311 for connecting to the busbar component.

[0183] The electrode terminal 23 further includes a terminal body 232, the terminal body 232 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 near the electrode assembly 22 in the thickness direction X of the wall portion is used for electrical connection with the tab 222, and the other end is connected to the connecting piece 231. Optionally, the connection structure between the terminal body 232 and the connecting piece 231 can be various, such as clamping, riveting, or welding connection.

[0184] The first insulating member 24 insulates and isolates the connector 231 of the electrode terminal 23 from the wall portion 211. The first insulating member 24 can be made of a variety of materials. For example, the first insulating member 24 can be made of at least one of solid insulating materials such as polypropylene, polyimide, and ceramic. Alternatively, the first insulating member 24 can be made of mica, powdered mica, and mica products, glass, fiberglass, and their products, or non-polar solid materials such as insulators and alumina films. The first insulating member 24 preferably has a comparative tracking index (CTI) greater than or equal to 175.

[0185] The first insulating member 24 is arranged on the side of the wall 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 insulating member 24 and arranged at intervals, that is, the first connecting member 231a and the second connecting member 231b are arranged at intervals on the first insulating member 24, so that part of the first insulating member 24 is located between the first connecting member 231a and the wall 211 and part of it is located between the second connecting member 231b and the wall 211, so that the first insulating member 24 is configured to insulate and isolate the wall 211 and the first connecting member 231a and the wall 211 and the second connecting member 231b, and the first insulating 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.

[0186] Optionally, the tab 222 and the electrode terminal 23 may be directly connected, for example, by abutment or welding. Alternatively, the tab 222 and the electrode terminal 23 may be indirectly connected via other components. For example, Figure 6 and Figure 11 In the embodiment, the battery cell 20 may further 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 is connected to a pole ear 222 and a terminal body 232 of an electrode terminal 23. Optionally, the connection structure between the current collecting member 25 and the pole ear 222 and between the current collecting member 25 and the terminal body 232 of the electrode terminal 23 may be various, such as abutment or welding connection.

[0187] In some embodiments, the battery cell 20 may further include a pressure relief component disposed on the housing 21 , and configured to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0188] Optionally, the pressure relief component may be provided on the end cover 213 of the outer shell 21, or may be provided on the shell 212 of the outer shell 21. Similarly, the pressure relief component and the outer shell 21 may be an integrally formed structure, or may be a separately provided structure. If the pressure relief component and the outer shell 21 are separately provided structures, that is, the pressure relief component and the outer shell 21 are split structures, the pressure relief component may be connected to the outer shell 21 by welding or the like, and correspondingly, the pressure relief component may be a component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve; if the pressure relief component and the outer shell 21 are an integrally formed structure, that is, the pressure relief component and the outer shell 21 are an integral structure, the pressure relief component is an area of ​​the outer shell 21 where a weak structure is formed, for example, the pressure relief component is an area of ​​the outer shell 21 where a pressure relief groove is provided.

[0189] In this embodiment, the two electrode terminals 23 are insulated and installed on the wall 211. The two electrode terminals 23 are electrically connected to the first pole ear 222a and the second pole ear 222b respectively, and the first connecting member 231a and the second connecting member 231b are both arranged on the first insulating member 24 and spaced apart, so that the electric energy of the battery cell 20 can be input or output through the two electrode terminals 23. The battery cell 20 with this structure can realize that the first connecting member 231a and the second connecting member 231b share the first insulating member 24, thereby reducing the difficulty of assembling the battery cell 20 and optimizing the assembly process of the battery cell 20, which is beneficial. In order to improve the production efficiency of the battery cell 20, on the other hand, the shell 21 can be made uncharged during the use of the battery cell 20 to alleviate the phenomenon of insufficient creepage distance between the shell 21 and the electrode terminal 23, which is beneficial to reducing the risk of short circuit or leakage between the battery cell 20 and other components. While the first connecting member 231a and the second connecting member 231b are insulated and isolated from the wall 211 by the first insulating member 24, the first connecting member 231a and the second connecting member 231b can also be separated to reduce the risk of short circuit between the first connecting member 231a and the second connecting member 231b, which is beneficial to improving the reliability of use.

[0190] According to some embodiments of the present application, referring to Figure 6 、 Figure 7 and Figure 11 , and please refer to Figure 12 , Figure 12 Schematic diagram of the structure of the first insulating member 24 of the battery cell 20 provided in 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 facing away from the wall portion 211. The first connecting member 231a and the second connecting member 231b are spaced apart and arranged in the assembly groove 241.

[0191] Among them, an assembly groove 241 is provided on the side of the first insulating member 24 facing away from the wall portion 211, that is, the first insulating member 24 is provided with an assembly groove 241 on the surface of the side facing away from the wall portion 211 in the thickness direction X of the wall portion, and the groove opening of the assembly groove 241 is located on the side of the first insulating member 24 facing away from the wall portion 211, so that the groove side wall of the assembly groove 241 is arranged around the connecting member 231, and the groove bottom wall of the assembly groove 241 is located between the connecting member 231 and the wall portion 211.

[0192] The first connecting member 231a and the second connecting member 231b are spaced apart and arranged in the assembly groove 241. That is, the first connecting member 231a and the second connecting member 231b are both arranged in the assembly groove 241, and the first connecting member 231a and the second connecting member 231b are spaced apart and arranged. Figure 6 and Figure 7 In the embodiment, the first connecting member 231a and the second connecting member 231b are spaced apart in the assembly groove 241 along the first direction Y.

[0193] In this embodiment, by providing an assembly groove 241 on the side of the first insulating member 24 away from the wall portion 211, and the first connecting member 231a and the second connecting member 231b are both provided in the assembly groove 241, on the one hand, the difficulty of providing the first connecting member 231a and the second connecting member 231b on the first insulating member 24 can be reduced, and the assembly stability between the first connecting member 231a and the first insulating member 24 and the second connecting member 231b and the first insulating member 24 can be improved. On the other hand, the connecting member 231 can be accommodated in the assembly groove 241, which is beneficial to further improve the effect of the first insulating member 24 insulated and isolated from the first connecting member 231a and the shell 21 and the second connecting member 231b and the shell 21.

[0194] According to some embodiments of the present application, see Figure 6 、 Figure 7 and Figure 12 As shown, a first partition 242 is provided in the assembly groove 241 . The first partition 242 is provided between the first connector 231 a and the second connector 231 b . The first partition 242 is configured to insulate and isolate the first connector 231 a from the second connector 231 b .

[0195] The first separator 242 serves to insulate and isolate the first connector 231 a from the second connector 231 b . The first separator 242 may be made of rubber, silicone, plastic, or the like.

[0196] The first partition 242 is provided in the assembly groove 241, that is, at least a portion of the first partition 242 is located in the assembly groove 241. The first partition 242 can be a structure interconnected with the groove bottom surface of the assembly groove 241, or a structure interconnected with the groove side surface of the assembly groove 241, or a structure connected to the groove bottom surface of the assembly groove 241 and the groove side surface of the assembly groove 241. For example, in Figure 12 In the embodiment, the first partition portion 242 is protruded from the bottom surface of the assembly groove 241 , and both ends of the first partition portion 242 in the extension direction are connected to the side surfaces of the assembly groove 241 .

[0197] Similarly, the first partition 242 and the first insulating part 24 can be an integrally formed structure. For example, the first partition 242 and the first insulating part 24 can be made by an integral forming process such as injection molding or milling. Of course, the first partition 242 and the first insulating part 24 can also be separately set structures. The first partition 242 can be connected to the assembly groove 241 of the first insulating part 24 by a structure such as bonding or snapping.

[0198] The first partition 242 is provided 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 242 is located between the first connecting member 231a and the second connecting member 231b. For example, Figure 6 and Figure 7 In the figure, the first connecting member 231a and the second connecting member 231b are arranged along the first direction Y, so that the first partition 242 is located directly between the first connecting member 231a and the second connecting member 231b in the first direction Y, and the extension direction of the first partition 242 is the second direction Z, and the first direction Y, the second direction Z and the thickness direction X of the wall are perpendicular to each other.

[0199] In this embodiment, by providing a first partition 242 in the assembly groove 241 of the first insulating member 24, and the first partition 242 is located between the first connector 231a and the second connector 231b, the first partition 242 can insulate and separate the first connector 231a and the second connector 231b. The battery cell 20 adopting this structure can, on the one hand, achieve physical separation between the first connector 231a and the second connector 231b provided in the assembly groove 241, so that during the use of the battery cell 20, the overlap phenomenon between the first connector 231a and the second connector 231b can be reduced, and the short circuit phenomenon between the first connector 231a and the second connector 231b caused by impurities falling between the first connector 231a and the second connector 231b can be alleviated. On the other hand, the creepage distance between the first connector 231a and the second connector 231b can be increased, thereby further reducing the risk of short circuit in the battery cell 20 during use.

[0200] According to some embodiments of this application, please continue to refer to Figure 6 、 Figure 7 and Figure 12 As shown, the first partition portion 242 is arranged on the bottom surface of the assembly groove 241, and the opposite ends of the first partition portion 242 in the direction perpendicular to the thickness direction X of the wall portion are connected to the groove side of the assembly groove 241 to divide the assembly groove 241 into two accommodating grooves 2411, and the first connecting member 231a and the second connecting member 231b are respectively arranged in the two accommodating grooves 2411.

[0201] Among them, the first partition portion 242 is connected to the bottom surface of the assembly groove 241 on the side facing the wall portion 211 in the thickness direction X of the wall portion. For example, the first partition portion 242 is a structure extending along the second direction Z, and both ends of the first partition portion 242 in the second direction Z are connected to the groove side of the assembly groove 241, so that the first partition portion 242 divides the assembly groove 241 into two accommodating grooves 2411 arranged along the first direction Y, and each accommodating groove 2411 is used to accommodate a connecting piece 231 of an electrode terminal 23.

[0202] It should be noted that, in other embodiments, the first partition portion 242 may be a structure in which only one end in the second direction Z is connected to the groove side of the assembly groove 241, or it may be a structure in which both ends of the first partition portion 242 in the second direction Z are spaced apart from the groove side of the assembly groove 241.

[0203] In this embodiment, by connecting the first partition portion 242 to the bottom surface of the assembly groove 241, and connecting the two ends of the first partition portion 242 in the direction perpendicular to the thickness direction X of the wall portion to the side surfaces of the assembly groove 241, the first partition portion 242 can separate the assembly groove 241 of the first insulating member 24 into two accommodating grooves 2411 respectively accommodating the first connecting member 231a and the second connecting member 231b, thereby further improving the effect of the first partition portion 242 in insulating and isolating the first connecting member 231a and the second connecting member 231b, which is beneficial to reducing the risk of short-circuiting between the first connecting member 231a and the second connecting member 231b during use.

[0204] According to some embodiments of the present application, see Figure 6 As shown, along the thickness direction X of the wall portion, the connecting member 231 has a first surface 2311 facing away from the wall portion 211 , and the first partition portion 242 has a second surface 2421 facing away from the wall portion 211 . The first surface 2311 and the second surface 2421 are coplanar.

[0205] The first surface 2311 and the second surface 2421 are coplanar, that is, a side of the connecting member 231 facing away from the wall portion 211 and a side of the first partition portion 242 facing away from the wall portion 211 are flush with each other.

[0206] In this embodiment, by setting the first surface 2311 of the connecting member 231 to be coplanar with the second surface 2421 of the first partition 242, so that the side of the connecting member 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, thereby improving the effect of the first partition 242 in insulating and isolating the first connecting member 231a and the second connecting member 231b while also improving the flatness between the connecting member 231 and the first partition 242, which is beneficial to reducing the interference between the connecting member 231 or the first partition 242 and other components.

[0207] Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the battery cell 20 can also have other structures. For example, along the thickness direction X of the wall portion, the connecting member 231 has a first surface 2311 facing away from the wall portion 211, and the first partition portion 242 has a second surface 2421 facing away from the wall portion 211. The first surface 2311 is closer to the wall portion 211 in the thickness direction X of the wall portion than the second surface 2421.

[0208] The first surface 2311 is closer to the wall 211 than the second surface 2421 in the wall thickness direction X. That is, the first partition 242 protrudes from the side of the connecting member 231 away from the wall 211 in the wall thickness direction X.

[0209] In this embodiment, by setting the first surface 2311 of the connecting member 231 to be closer to the wall portion 211 than the second surface 2421 of the first partition portion 242 in the thickness direction X of the wall portion, so that the first partition portion 242 is a structure that extends beyond the side of the connecting member 231 away from the wall portion 211 in the thickness direction X of the wall portion, the effect of the first partition portion 242 in insulating and isolating the first connecting member 231a and the second connecting member 231b can be improved, thereby reducing the risk of short circuit between the first connecting member 231a and the second connecting member 231b during use.

[0210] In some embodiments, see Figure 6 and Figure 12 As shown, the first partition 242 and the first insulating member 24 are integrally formed, that is, the first partition 242 and the first insulating member 24 are an integrated structure, and the first partition 242 and the first insulating member 24 are structures made by an integral molding process such as injection molding or milling.

[0211] In this embodiment, by setting the first partition 242 and the first insulating member 24 as an integrally formed structure, it is beneficial to improve the connection stability and reliability between the first partition 242 and the first insulating member 24, so as to reduce the risk of the first partition 242 falling off during use, thereby improving the stability and reliability of the first partition 242 in insulating and isolating the first connecting member 231a and the second connecting member 231b.

[0212] In some embodiments, see Figure 6 As shown, along the thickness direction X of the wall, the connecting member 231 extends out of the assembly groove 241 , that is, the connecting member 231 extends in the thickness direction X of the wall out of the surface of the first insulating member 24 provided with the assembly groove 241 .

[0213] In this embodiment, by setting the connecting member 231 to a structure in which the assembly groove 241 of the first insulating member 24 extends in the thickness direction X of the wall portion, part of the connecting member 231 is located in the assembly groove 241 in the thickness direction X of the wall portion, and the other part is located outside the assembly groove 241 in the thickness direction X of the wall portion, thereby reducing the difficulty of connecting the connecting member 231 and the busbar component when the battery cells 20 are subsequently assembled into groups, which is beneficial to improving the efficiency of subsequent assembly of the battery cells 20 into groups.

[0214] According to some embodiments of the present application, see Figure 6 and Figure 7 As shown, along a direction perpendicular to the thickness direction X of the wall portion, the minimum distance between the first connecting member 231a and the second connecting member 231b is D1, satisfying D1≥1.5mm.

[0215] The first connecting piece 231a and the second connecting piece 231b are arranged along the first direction Y, and the minimum distance D1 of the first connecting piece 231a and the second connecting piece 231b in the first direction Y corresponds.

[0216] Exemplarily, the minimum distance D1 of the first connecting piece 231a and the second connecting piece 231b in the first direction Y can be 1.5 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, or 8 mm, etc.

[0217] In the embodiment, by setting the minimum distance of the first connecting piece 231a and the second connecting piece 231b in the direction perpendicular to the thickness direction X of the wall portion to be greater than or equal to 1.5 mm, the creepage distance between the first connecting piece 231a and the second connecting piece 231b is increased, which is beneficial to improve the electrical clearance between the first connecting piece 231a and the second connecting piece 231b, thereby reducing the risk of bridging between the first connecting piece 231a and the second connecting piece 231b.

[0218] In some embodiments, please refer to Figure 7 As shown in the figure, the minimum distance between the first connecting piece 231a and the second connecting piece 231b in the direction perpendicular to the thickness direction X of the wall portion is D1, which satisfies D1≥3 mm.

[0219] In the embodiment, by further setting the minimum distance of the first connecting piece 231a and the second connecting piece 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 piece 231a and the second connecting piece 231b is further increased, which can effectively alleviate the phenomenon of insufficient electrical clearance between the first connecting piece 231a and the second connecting piece 231b when the battery monomer 20 is used in high altitude areas, and can effectively alleviate the phenomenon that impurities falling between the first connecting piece 231a and the second connecting piece 231b cause the short circuit of the first connecting piece 231a and the second connecting piece 231b, thereby reducing the risk of short circuit between the first connecting piece 231a and the second connecting piece 231b.

[0220] In some embodiments, please continue to refer to Figure 7 As shown in the figure, the minimum distance between the first connecting piece 231a and the second connecting piece 231b in the direction perpendicular to the thickness direction X of the wall portion is D1, which satisfies 4 mm≤D1≤8 mm.

[0221] In this embodiment, by further setting the minimum distance between the first connector 231a and the second connector 231b in the direction perpendicular to the thickness direction X of the wall to be greater than or equal to 4 mm, the creepage distance between the first connector 231a and the second connector 231b is further increased, thereby further alleviating the phenomenon of insufficient electrical clearance between the first connector 231a and the second connector 231b when the battery cell 20 is used in high-altitude areas, and further alleviating the phenomenon of impurities falling between the first connector 231a and the second connector 231b and causing a short circuit between the first connector 231a and the second connector 231b, thereby further reducing the risk of short circuit between the first connector 231a and the second connector 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 the first connecting member 231a and the second connecting member 231b occupying too much space due to the large spacing between the first connecting member 231a and the second connecting member 231b can be alleviated, and the difficulty of assembly between the first connecting member 231a and the first insulating member 24 and the second connecting member 231b and the first insulating member 24 can be reduced.

[0222] According to some embodiments of the present application, see Figure 6 and Figure 7 As shown, along the thickness direction X of the wall portion, the connecting member 231 has a first surface 2311 away from the wall portion 211 , and the edge of the first surface 2311 includes a first edge 23111 a , which is arc-shaped.

[0223] The edge of the first surface 2311 includes a first edge 23111 a , and the first edge 23111 a is arc-shaped. That is, at least part of the edge of the first surface 2311 of the connecting member 231 is arc-shaped.

[0224] In this embodiment, the first edge 23111a of the first surface 2311 of the connecting member 231 is set to an arc-shaped structure, so that at least part of the edge of the first surface 2311 of the connecting member 231 is an arc-shaped structure, thereby improving the smoothness of the edge of the first surface 2311 of the connecting member 231 and alleviating the collision between the connecting member 231 and other components.

[0225] In some embodiments, see Figure 7 As shown, in the same plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the wall portion 211 is circular, and the orthographic projection of the wall portion 211 and the orthographic projection of the first edge 23111 a are concentrically arranged.

[0226] Among them, the shell 21 of the battery cell 20 is cylindrical, 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 an end wall of the shell 21 of the cylindrical structure, so that the wall portion 211 is a circular plate-like structure, that is, the orthographic projection of the wall portion 211 in a plane perpendicular to the thickness direction X of the wall portion is circular.

[0227] 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.

[0228] Exemplarily, the center of the orthographic projection of the wall portion 211 in a plane perpendicular to the thickness direction X of the wall portion and the center of the orthographic projection of the first edge 23111a in a plane perpendicular to the thickness direction X of the wall portion are both located on the central axis of the shell 21.

[0229] In this embodiment, by setting the projection of the wall portion 211 in the thickness direction X of the wall portion to be circular, 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 to be concentrically arranged, so that the shapes of the first edge 23111a and the edge of the wall portion 211 fit each other, the battery cell 20 adopting this structure can maximize the space utilization of the first surface 2311 of the connector 231 on the wall portion 211, which is beneficial to increasing the area of ​​the first surface 2311 of the connector 231, so that when the battery cells 20 are subsequently assembled into groups, the area of ​​the first surface 2311 of the connector 231 used for connection with the convergence component can be increased, which is beneficial to improving the flow capacity between the connector 231 and the convergence component.

[0230] According to some embodiments of this application, see Figure 7 As shown, the first connecting member 231a and the second connecting member 231b are arranged opposite each other and spaced apart along the first direction Y. The first surface 2311 has a first region 23111 and a second region 23112 arranged and connected along the second direction Z. 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 a first edge 23111a. In a plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the second region 23112 is rectangular. The edge of the second region 23112 includes a second edge 23112a, which is connected to and tangent to the first edge 23111a.

[0231] The second edge 23112a is connected to and tangent to the first edge 23111a. That is, a straight edge of the second region 23112 of the first surface 2311 is connected to and tangent to the arc edge of the first region 23111 of the first surface 2311. This allows the second edge 23112a to be perpendicular to the normal direction of the connection between the first edge 23111a and the second edge 23112a. Exemplarily, the second edge 23112a extends along the second direction Z.

[0232] For example, in Figure 7 In the embodiment, the second edge 23112a of the second region 23112 of the first surface 2311 of the connector 231 of one electrode terminal 23 is located in the first direction Y on a side of the second region 23112 away from the other electrode terminal 23 .

[0233] In this embodiment, the first connector 231a and the second connector 231b are arranged opposite to each other and spaced apart along the first direction Y. By setting the first surface 2311 as a first area 23111 and a second area 23112 arranged and connected along the second direction Z, and setting the second edge 23112a of the second area 23112 to a structure connected to and tangent to the first edge 23111a of the first area 23111, the battery cell 20 with this structure can, on the one hand, optimize the spatial layout of the first connector 231a and the second connector 231b to improve the space utilization of the connector 231 on the wall 211, and on the other hand, further increase the area of ​​the first surface 2311, so that when the battery cells 20 are subsequently assembled into groups, the area of ​​the first surface 2311 of the connector 231 used for connection with the busbar component can be further increased.

[0234] In some embodiments, see Figure 7 As shown, the first area 23111 also includes a third edge 23111b, and the second area 23112 also includes a fourth edge 23112b. The fourth edge 23112b and the second edge 23112a are arranged opposite to each other 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 collinearly.

[0235] Among them, the second edge 23112a and the fourth edge 23112b are two straight edges that are opposite and parallel to each other in the first direction Y of the second area 23112 with a rectangular structure, and the third edge 23111b is a straight edge in the first area 23111 connecting the first edge 23111a and the fourth edge 23112b.

[0236] exist Figure 7In some embodiments, the fifth edge 23112c of the second region 23112 is connected to the second edge 23112a and the fourth edge 23112b of the second region 23112 in the first direction Y, and it is to be noted that the fifth edge 23112c and the second edge 23112a and the fifth edge 23112c and the fourth edge 23112b can be directly connected to form a right angle structure, or indirectly connected through a rounded edge to form a circular arc transition structure, and exemplarily, in Figure 7 In some embodiments, 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.

[0237] The fourth edge 23112b and the third edge 23111b are arranged in line, that is, 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 in the second direction Z.

[0238] Exemplarily, in Figure 7 In some embodiments, the third edge 23111b of the first surface 2311 of the connecting piece 231 of the two electrode terminals 23 is arranged to face each other in the first direction Y, and the fourth edge 23112b of the first surface 2311 of the connecting piece 231 of the two electrode terminals 23 is arranged to face each other in the first direction Y.

[0239] 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 area of the first surface 2311 is increased while the regularity of the shape of the first surface 2311 is also improved, 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.

[0240] According to some embodiments of the present application, referring to Figure 6 and Figure 11 , and further referring to Figure 13 , Figure 13This figure shows a cross-sectional view of an electrode terminal 23 of a battery cell 20 provided in some embodiments of the present application. Two mounting holes 2111 are provided in the wall portion 211. The mounting holes 2111 extend through both sides of the wall portion 211 along the thickness direction X of the wall portion. The electrode terminals 23 correspond one-to-one with the mounting holes 2111. The electrode terminal 23 also includes a terminal body 232. The terminal body 232 extends through the mounting holes 2111 along the thickness direction X of the wall portion and is connected to the connector 231. The terminal body 232 is electrically connected to the tab 222.

[0241] The mounting hole 2111 is a structure extending along the thickness direction X of the wall portion, and both ends of the mounting hole 2111 in the thickness direction X of the wall portion extend to the surfaces of both sides of the wall portion 211 in the thickness direction X of the wall portion.

[0242] The electrode terminals 23 correspond to the mounting holes 2111 one by one, that is, each electrode terminal 23 is assembled in one mounting hole 2111 .

[0243] In the embodiment of the present application, the terminal body 232 is the main part of the electrode terminal 23. The terminal body 232 mainly serves to electrically connect the pole ear 222 and the busbar component. 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 respectively, so that the end of the terminal body 232 located inside the shell 21 in the thickness direction X of the wall portion can be electrically connected to the pole ear 222, and the end of the terminal body 232 located outside the shell 21 in the thickness direction X of the wall portion can be connected to the connector 231 to realize the input or output of electrical energy of the battery cell 20.

[0244] Optionally, the connection structure between the terminal body 232 and the connector 231 can be various, such as riveting, welding, clamping or bonding, etc. Similarly, the connection structure between the terminal body 232 and the tab 222 can also be various. The terminal body 232 can be a structure directly connected to the tab 222, such as welding or abutment, etc. Of course, the terminal body 232 can also be a structure indirectly connected to the tab 222 through other components, for example, the terminal body 232 is connected to the tab 222 through the current collecting member 25.

[0245] In this embodiment, the electrode terminal 23 is also provided with a terminal body 232, and the terminal body 232 is passed through 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 to the pole ear 222, and the other end is located on the side of the wall portion 211 away from the electrode assembly 22 and can be connected to the connector 231, so as to realize the electrical connection of the electrode terminal 23 to the pole ear 222 of the electrode assembly 22, and to realize the electrode terminal 23 inputting or outputting the electrical energy of the battery cell 20. The structure is simple and easy to assemble.

[0246] According to some embodiments of the present application, see Figure 6 As shown, along the thickness direction X of the wall portion, two protrusions 243 are protruded on the side of the first insulating member 24 facing the wall portion 211, each protrusion 243 is inserted into a mounting hole 2111, and the protrusion 243 is located between the terminal body 232 and the hole wall surface of the mounting hole 2111 to insulate and isolate the wall portion 211 and the terminal body 232.

[0247] Among them, the protrusion 243 is protruded from the surface where the first insulating member 24 and the wall portion 211 abut against each other, and each protrusion 243 is inserted into the corresponding mounting hole 2111 along the thickness direction X of the wall portion. The protrusion 243 and the first insulating member 24 can be an integrally formed structure. For example, the protrusion 243 and the first insulating member 24 can be made by an integral forming process such as injection molding or milling. Of course, the protrusion 243 and the first insulating member 24 can also be a separate structure. The protrusion 243 can be connected to the surface of the first insulating member 24 facing the wall portion 211 by a structure such as bonding or clamping.

[0248] The protrusion 243 is located between the terminal body 232 and the hole wall surface of the mounting hole 2111 to insulate the separation wall portion 211 and the terminal body 232. That is, at least part of the protrusion 243 is located between the outer peripheral surface of the terminal body 232 and the hole wall surface of the mounting hole 2111, so that the protrusion 243 can insulate the separation wall portion 211 and the terminal body 232.

[0249] In this embodiment, a protrusion 243 is provided on the side of the first insulating member 24 facing the wall portion 211, and the protrusion 243 is inserted into the corresponding mounting hole 2111 in the thickness direction X of the wall portion, and the protrusion 243 extends between the corresponding terminal body 232 and the hole wall surface of the mounting hole 2111. The battery cell 20 adopting this structure can, on the one hand, play a certain positioning and limiting role on the first insulating member 24 through the cooperation between the protrusion 243 and the mounting hole 2111, which is beneficial to improving the accuracy and stability of the first insulating member 24 assembled on the wall portion 211. On the other hand, the protrusion 243 can also play a role of insulation isolation between the terminal body 232 and the hole wall surface of the mounting hole 2111, which is beneficial to reducing the risk of short circuit between the terminal body 232 and the wall portion 211.

[0250] In some embodiments, see Figure 6 As shown, the protrusion 243 is disposed around the terminal body 232 , that is, the protrusion 243 is an annular structure surrounding the outer side of the terminal body 232 .

[0251] In this embodiment, by setting the protrusion 243 as an annular structure surrounding the outer side of the terminal body 232, the effect of the protrusion 243 in insulating and separating the terminal body 232 and the hole wall of the mounting hole 2111 is further enhanced, which helps to further reduce the risk of short circuit between the terminal body 232 and the wall portion 211.

[0252] According to some embodiments of the present application, see Figure 6 As shown, the battery cell 20 may further include two seals 26 , which correspond one to one with the electrode terminals 23 . The seals 26 are disposed between the terminal body 232 and the wall portion 211 . The seals 26 are configured to seal the gap between the terminal body 232 and the wall surface of the mounting hole 2111 .

[0253] The seal 26 seals the gap between the terminal body 232 and the wall of the mounting hole 2111 . The seal 26 can be made of various materials, for example, rubber, plastic, or silicone.

[0254] For example, see Figure 6 and Figure 13As shown, the sealing member 26 is arranged between the wall portion 211 and the second clamping portion 2322 of the terminal body 232, so as to indirectly seal the gap between the terminal body 232 and the hole wall surface of the mounting hole 2111 through the gap between the sealing wall portion 211 and the second clamping portion 2322 of the terminal body 232. Of course, in other embodiments, the sealing member 26 can also be arranged in the mounting hole 2111, that is, the sealing member 26 is arranged between the outer peripheral surface of the terminal body 232 and the hole wall surface of the mounting hole 2111, so as to seal the gap between the terminal body 232 and the hole wall surface of the mounting hole 2111.

[0255] In this embodiment, a seal 26 is provided between each terminal body 232 and the wall portion 211, so that the seal 26 can also seal the gap between the corresponding terminal body 232 and the wall portion 211, thereby reducing the phenomenon of gas or liquid in the outer shell 21 of the battery cell 20 leaking from the mounting hole 2111 of the wall portion 211, thereby reducing the risk of liquid or gas leakage of the battery cell 20 during use.

[0256] According to some embodiments of the present application, Figure 6 and Figure 13 As shown, a first clamping portion 2321 is protruded from the outer peripheral surface of the terminal body 232 . Along the thickness direction X of the wall, the first clamping portion 2321 abuts against the connector 231 to limit the connector 231 from separating from the wall 211 in a direction away from the wall 211 .

[0257] Among them, the first clamping portion 2321 serves to limit the connection member 231 from detaching from the wall portion 211 in the direction away from the wall portion 211 in the thickness direction X of the wall portion. The first clamping portion 2321 abuts against the connection member 231 along the thickness direction X of the wall portion, that is, at least a portion of the connection member 231 is located between the first clamping portion 2321 and the wall portion 211 in the thickness direction X of the wall portion.

[0258] In this embodiment, a first clamping portion 2321 is protruded on the outer peripheral surface of the terminal body 232, and the first clamping portion 2321 can abut against the connecting member 231 in the thickness direction X of the wall portion to limit the connecting member 231 from detaching from the wall portion 211 along the thickness direction X of the wall portion, thereby realizing the assembly and fixing of the connecting member 231 on the wall portion 211, which has a simple structure and is easy to assemble.

[0259] According to some embodiments of the present application, see Figure 13As shown, the connector 231 is provided with a connecting hole 2312, which passes through the connector 231 along the wall thickness direction X. The connecting hole 2312 includes a first hole section 2312a and a second hole section 2312b arranged along the wall thickness direction X. The first hole section 2312a has a larger diameter than 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 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 stepped surface 2312c. The terminal body 232 is inserted into the connecting hole 2312 along the wall thickness direction X, and at least a portion of the first clamping portion 2321 is located in the first hole section 2312a. The first clamping portion 2321 abuts against the stepped surface 2312c in the wall thickness direction X.

[0260] Among them, the connecting hole 2312 includes a first hole segment 2312a and a second hole segment 2312b arranged along the thickness direction X of the wall portion, and the aperture of the first hole segment 2312a is larger than the aperture of the second hole segment 2312b. That is, the connecting hole 2312 is a stepped hole structure having a first hole segment 2312a and a second hole segment 2312b, and the projection of the second hole segment 2312b in the thickness direction X of the wall portion is located within the first hole segment 2312a.

[0261] The first hole segment 2312a is located at an end of the second hole segment 2312b away from the wall portion 211 , that is, the first hole segment 2312a is farther away from the wall portion 211 than the second hole segment 2312b in the thickness direction X of the wall portion.

[0262] The hole wall surface of the first hole segment 2312a and the hole wall surface of the second hole segment 2312b are connected by a step surface 2312c. The step surface 2312c is a plane connecting the hole wall surface of the first hole segment 2312a and the hole wall surface of the second hole segment 2312b. Exemplarily, the step surface 2312c is perpendicular to the thickness direction X of the wall portion.

[0263] In this embodiment, a connecting hole 2312 is provided on the connecting member 231, which passes through the connecting member 231 along the thickness direction X of the wall portion, and the connecting hole 2312 is a stepped hole structure including a first hole segment 2312a and a second hole segment 2312b arranged along the thickness direction X of the wall portion, so that a step surface 2312c is formed between the hole wall surface of the first hole segment 2312a and the hole wall surface of the second hole segment 2312b, so that the terminal body 232 and the connecting member 231 can be assembled by inserting the terminal body 232 into the connecting hole 2312 and abutting the first clamping portion 2321 against the step surface 2312c. The structure is simple, easy to implement, and has high stability.

[0264] In some embodiments, see Figure 13As shown, the connector 231 has a first surface 2311 facing away from the wall 211 in the thickness direction X of the wall, and the connection hole 2312 passes through the first surface 2311. Along the thickness direction X of the wall, the end of the terminal body 232 inserted into the connection hole 2312 does not protrude from the first surface 2311.

[0265] Among them, one end of the terminal body 232 inserted in the connecting hole 2312 does not protrude from the first surface 2311, that is, the terminal body 232 is inserted in the connecting hole 2312, and the terminal body 232 does not extend out of the connecting hole 2312 away from the wall portion 211 in the thickness direction X of the wall portion. For example, the first clamping portion 2321 is entirely located in the first hole section 2312a.

[0266] In this embodiment, by setting one end of the terminal body 232 inserted into the connecting hole 2312 so as not to protrude from the first surface 2311 in the thickness direction X of the wall, so that the end of the terminal body 232 inserted into the connecting hole 2312 does not extend out of the end of the connecting hole 2312 passing through the first surface 2311, on the one hand, the interference between the terminal body 232 and the convergence component can be reduced when the battery cells 20 are subsequently assembled into groups, and on the other hand, the phenomenon of the terminal body 232 being worn or bumped can be reduced.

[0267] According to some embodiments of the present application, Figure 6 and Figure 13 As shown, a second clamping portion 2322 is also protruding from the outer peripheral surface of the terminal body 232. Along the thickness direction X of the wall, the second clamping portion 2322 is located on the side of the wall 211 facing the electrode assembly 22, and at least part of the wall 211 is located between the second clamping portion 2322 and the connecting member 231.

[0268] The connecting piece 231 and the second clamping portion 2322 are respectively located on both sides of the wall portion 211 in the thickness direction X of the wall portion, so that a portion of the wall portion 211 is located between the connecting piece 231 and the second clamping portion 2322, so that the connecting piece 231 and the second clamping portion 2322 can cooperate to clamp the wall portion 211, thereby achieving the fastening and assembly of the electrode terminal 23 on the wall portion 211. It should be noted that the connecting piece 231 and the second clamping portion 2322 can be a structure that directly clamps the wall portion 211 or a structure that indirectly clamps the wall portion 211. For example, in Figure 6 In the embodiment, the connecting member 231 and the second clamping portion 2322 are structures for indirectly clamping the wall portion 211 . The connecting member 231 is in indirect contact with the wall portion 211 through the first insulating member 24 , and the second clamping portion 2322 is in indirect contact with the wall portion 211 through the sealing member 26 and the third insulating member 28 .

[0269] Exemplarily, the first clamping portion 2321 and the second clamping portion 2322 are both annular structures surrounding the outer circumference of the terminal body 232 .

[0270] In this embodiment, a second clamping portion 2322 is protruded on the outer peripheral surface of the terminal body 232, and the second clamping portion 2322 is located on the side of the wall portion 211 facing the electrode assembly 22. By setting at least a portion of the wall portion 211 to be located between the second clamping portion 2322 and the connecting member 231, the second clamping portion 2322 and the connecting member 231 can cooperate to clamp and assemble the wall portion 211, so as to fasten the electrode terminal 23 to the wall portion 211, thereby enabling the assembly between the electrode terminal 23 and the wall portion 211 to be realized. The structure is simple, easy to implement, and has high stability.

[0271] According to some embodiments of the present application, see Figure 6 and Figure 11 As shown, the battery cell 20 may further include two current collecting members 25 . Both current collecting members 25 are disposed between the wall portion 211 and the main body portion 221 . One current collecting member 25 is connected to one electrode terminal 23 and one tab 222 .

[0272] The current collecting member 25 connects the electrode terminal 23 and the tab 222. The current collecting member 25 can be made of a variety of materials, such as copper, iron, aluminum, steel, or an aluminum alloy. Similarly, the connection structures 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 or abutment.

[0273] It should be noted that, in the embodiment where the electrode terminal 23 includes a terminal body 232 and a connector 231 , the current collecting member 25 is a structure that connects the tab 222 and the terminal body 232 of the electrode terminal 23 .

[0274] In this embodiment, two current collecting components 25 are provided between the wall portion 211 and the main body portion 221 , and each current collecting component 25 is connected to an electrode terminal 23 and a tab 222 , thereby reducing the difficulty of electrical connection between the tab 222 and the electrode terminal 23 and improving the assembly efficiency of the battery cell 20 .

[0275] According to some embodiments of the present application, referring to Figure 6 and Figure 11 , and please refer to Figure 14 , Figure 14Schematic diagram of the assembly of the second insulating member 27 and the current collecting member 25 of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 may also include a second insulating member 27, which is disposed between the wall portion 211 and the main body 221. The two current collecting members 25 are spaced apart on the second insulating member 27, and the second insulating member 27 is configured to insulate and separate the two current collecting members 25.

[0276] Among them, the two current collecting components 25 are arranged at intervals on the second insulating component 27, that is, the two current collecting components 25 are assembled on the second insulating component 27 and are arranged at intervals from each other, so that the second insulating component 27 can not only provide assembly and fixation for the two current collecting components 25, but also play the role of insulating and isolating the two current collecting components 25.

[0277] Exemplarily, the second insulating member 27 can be made of various materials, such as rubber, silicone, or plastic.

[0278] In this embodiment, by arranging a second insulating member 27 between the wall portion 211 and the main body portion 221, and spacing the two current collecting components 25 on the second insulating member 27, the battery cell 20 adopting this structure can, on the one hand, improve the stability of the two current collecting components 25 arranged between the wall portion 211 and the main body portion 221, which is beneficial to reducing the risk of shaking of the two current collecting components 25 during use; on the other hand, the second insulating member 27 can insulate and separate the two current collecting components 25 to reduce the risk of short circuit between the two current collecting components 25, and the two current collecting components 25 can also share the second insulating member 27, which is beneficial to reducing the assembly difficulty of the battery cell 20 and optimizing the assembly process of the battery cell 20.

[0279] In some embodiments, see Figure 6 and Figure 14 As shown, part of the current collecting member 25 is embedded in the second insulating member 27 . That is, the second insulating member 27 covers the outer side of the part of the current collecting member 25 , so that the part of the current collecting member 25 is located inside the second insulating member 27 .

[0280] It should be noted that, in other embodiments, the assembly structure between the current collecting component 25 and the second insulating component 27 may also be other structures. For example, the current collecting component 25 may also be assembled on the second insulating component 27 by bonding, bolting, or clamping.

[0281] In this embodiment, the current collecting member 25 is partially embedded in the second insulating member 27 to improve the structural stability and reliability of the current collecting member 25 set on the second insulating member 27, which is beneficial to reduce the risk of short circuit between the current collecting member 25 and other components after it is detached from the second insulating member 27.

[0282] According to some embodiments of the present application, see Figure 14 As shown, the current collecting member 25 may include a first portion 251, a second portion 252, and a third portion 253. The first portion 251 and the second portion 252 are arranged opposite each other 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 is connected to the electrode tab 222. The second portion 252 is located on a side of the second insulating member 27 away from the main body 221 in the thickness direction X of the wall portion and is connected to the electrode terminal 23.

[0283] Among them, the first part 251, the third part 253 and the second part 252 of the current collecting component 25 are structures connected in sequence, that is, the third part 253 is connected between the first part 251 and the second part 252, and the first part 251 and the second part 252 are relatively arranged along the thickness direction X of the wall, that is, the first part 251 and the second part 252 are structures spaced apart along the thickness direction X of the wall, so that the third part 253 is a curved structure.

[0284] For example, in Figure 14 In the embodiment, the first part 251, the second part 252 and the third part 253 of the current collecting component 25 are an integrally formed structure, that is, part of the current collecting component 25 is bent to form the third part 253, so that the current collecting component 25 is a "U"-shaped structure, and the first part 251 and the second part 252 are formed in the thickness direction X of the wall. Of course, in other embodiments, the first part 251, the second part 252 and the third part 253 of the current collecting component 25 can also be a separately arranged structure, and the connection structure between the first part 251, the second part 252 and the third part 253 of the current collecting component 25 can be various, such as welding connection or clamping, etc.

[0285] Part of the first portion 251 is embedded in the second insulating member 27 , and the first portion 251 is connected to the pole tab 222 . That is, the first portion 251 of the current collecting component 25 is the area where the current collecting component 25 and the pole tab 222 are connected to each other, and the first portion 251 of the current collecting component 25 is the portion embedded in the second insulating member 27 .

[0286] The second portion 252 is located on the side of the second insulating member 27 away from the main body 221 in 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 the area 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 in 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 in the thickness direction X of the wall portion.

[0287] In this embodiment, the current collecting component 25 is provided with a first part 251, a second part 252 and a third part 253. The first part 251 and the second part 252 are arranged opposite to each other along the thickness direction X of the wall portion, and the third part 253 connects the first part 251 and the second part 252, so that the current collecting component 25 is bent to form a structure similar to a "U" shape. By embedding the first part 251 in the second insulating member 27 and connecting it to the pole ear 222, and setting the second part 252 to be located on the side of the second insulating member 27 facing the wall portion 211 and connected to the electrode terminal 23, the battery cell 20 adopting this structure can reduce the difficulty of connecting the current collecting component 25 to the electrode terminal 23 and the pole ear 222, which is conducive to improving the assembly efficiency of the battery cell 20.

[0288] According to some embodiments of the present application, see Figure 6 and Figure 14 As shown, the second insulating member 27 may include a mounting portion 271 and a second partition portion 272, a portion of the first portion 251 is embedded in the mounting portion 271, the second partition 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 partition portion 272 is located between the second portions 252 of the two current collecting components 25, and the second partition portion 272 is configured to insulate and isolate the second portions 252 of the two current collecting components 25.

[0289] Among them, the mounting portion 271 and the second partition portion 272 of the second insulating member 27 are structures arranged along the thickness direction X of the wall portion, and the second partition 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 partition portion 272 of the second insulating member 27 can be structures that are not connected to each other, that is, the mounting plate and the second partition portion 272 can be separated from each other. Of course, the mounting portion 271 and the second partition portion 272 of the second insulating member 27 can also be structures that are connected to each other. If the mounting portion 271 and the second partition portion 272 of the second insulating member 27 are connected to each other, then the connection structure between the mounting portion 271 and the second partition portion 272 of the second insulating member 27 can be various, such as bonding or snapping.

[0290] For example, in the embodiment of the present application, the mounting portion 271 and the second partition portion 272 of the second insulating member 27 are structures that are not connected to each other.

[0291] The second separator 272 is located between the second portions 252 of the two current collecting members 25 and is configured to insulate and isolate the second portions 252 of the two current collecting members 25. In other words, the second separator 272 is a component of the second insulating member 27 that plays a role of separating the second portions 252 of the two current collecting members 25. Figure 6In the embodiment, 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. Correspondingly, the second portions 252 of the two current collecting members 25 are spaced apart along the first direction Y, so that the second partition 272 of the second insulating member 27 is located between the second portions 252 of the two current collecting members 25 in the first direction Y. For example, in Figure 6 In the embodiment, one end of the second portion 252 of the current collecting member 25 close to the second partition 272 in the first direction Y is embedded in the second portion 252 .

[0292] In this embodiment, the second insulating member 27 is provided with a mounting portion 271 and a second partition portion 272. By embedding the first part 251 of the current collecting component 25 in the mounting portion 271 and setting the second partition portion 272 to be located between the second parts 252 of the two current collecting components 25, the mounting portion 271 can fix and insulate the first parts 251 of the two current collecting components 25 while also playing the role of insulating and separating the first parts 251 of the two current collecting components 25 through the second partition portion 272, which is beneficial to further enhance the effect of the second insulating member 27 in insulating and isolating the two current collecting components 25, so as to reduce the risk of short circuit between the two current collecting components 25 during use.

[0293] In some embodiments, combined Figure 6 and Figure 14 As shown, the second portion 252 is provided with a through hole 2521 , which passes through both sides of the second portion 252 along the wall thickness direction X. The electrode terminal 23 is passed through the through hole 2521 along the wall thickness direction X.

[0294] Among them, the through hole 2521 is a structure that penetrates the surfaces of both sides of the second part 252 of the current collecting component 25 in the thickness direction X of the wall, and the electrode terminal 23 is arranged in the through hole 2521 along the thickness direction X of the wall, so that the second part 252 is a structure that is sleeved on the outside of the electrode terminal 23.

[0295] It should be noted that, in the embodiment where the electrode terminal 23 includes a terminal body 232, the terminal body 232 is structured to pass through the through hole 2521 along the thickness direction X of the wall. Of course, in the embodiment where a second clamping portion 2322 is convexly provided on the outer peripheral surface of the terminal body 232, the second clamping portion 2322 is located on the side of the second part 252 away from the wall 211 in the thickness direction X of the wall, that is, the second clamping portion 2322 is located between the first part 251 and the second part 252 of the current collecting component 25 in the thickness direction X of the wall, so that the second part 252 is located between the second clamping portion 2322 and the wall 211 in the thickness direction X of the wall. The battery cell 20 adopting this structure can further improve the assembly stability and reliability between the electrode terminal 23 and the current collecting component 25.

[0296] In the present embodiment, by arranging the through hole 2521 penetrating the second portion 252 along 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 arranged 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.

[0297] According to some embodiments of the present application, as shown in Figure 5 , Figure 6 and Figure 11 , the battery monomer 20 can further include a third insulating piece 28 arranged between the wall portion 211 and the current collecting member 25, and the third insulating piece 28 is configured to insulate and separate the current collecting member 25 and the wall portion 211.

[0298] 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, etc.

[0299] 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.

[0300] According to some embodiments of the present application, in combination with Figure 5 , Figure 8 and Figure 9As shown, the electrode assembly 22 includes a first electrode piece 223 and a second electrode piece 225 with opposite polarities, the first electrode piece 223 has a first electrode piece body 2231 and a first sub-electrode ear 2232, the first sub-electrode ear 2232 is connected to the first electrode piece body 2231 in the thickness direction X of the wall portion, one end close to the wall portion 211, the second electrode piece 225 has a second electrode piece body 2251 and a second sub-electrode ear 2252, the second sub-electrode ear 2252 is connected to the second electrode piece body 2251 in the thickness direction X of the wall portion, one end close to the wall portion 211, all the first sub-electrode ears 2232 in the electrode assembly 22 form a first electrode ear 222a, all the second sub-electrode ears 2252 in the electrode assembly 22 form a second electrode ear 222b, and the main body 221 includes a first electrode piece body 2231 and a second electrode piece body 2251. Along the thickness direction X of the wall portion, the second pole piece body 2251 has a first end 2251 a away from the wall portion 211 , and the first pole piece body 2231 extends beyond the first end 2251 a .

[0301] The first pole piece 223 has a plurality of first sub-pole tabs 2232, each of which is connected to one end of the first pole piece body 2231 in the thickness direction X of the wall portion, close to the wall portion 211. The plurality of first sub-pole tabs 2232 form the first pole tab 222a of the electrode assembly 22, i.e., the first sub-pole tab 2232 is a plurality of sub-pole tabs 2221 of the first pole tab 222a of the two pole tabs 222 of the electrode assembly 22. Similarly, the second pole piece 225 has a plurality of second sub-pole tabs 2252, each of which is connected to one end of the second pole piece body 2251 in the thickness direction X of the wall portion, close to the wall portion 211. The plurality of second sub-pole tabs 2252 form the second pole tab 222b of the electrode assembly 22, i.e., the second sub-pole tab 2252 is a plurality of sub-pole tabs 2221 of the second pole tab 222b of the two pole tabs 222 of the electrode assembly 22.

[0302] The main body 221 includes a first pole piece body 2231 and a second pole piece body 2251, that is, the main body 221 of the electrode assembly 22 includes at least the first pole piece body 2231 of the first pole piece 223 and the second pole piece body 2251 of the second pole piece 225. In the embodiment of the present application, the electrode assembly 22 also includes an isolating member 224, which is arranged between the first pole piece 223 and the second pole piece 225 to separate the first pole piece body 2231 of the first pole piece 223 and the second pole piece body 2251 of the second pole piece 225. The first pole piece body 2231, the isolating member 224 and the second pole piece body 2251 are wound to form the main body 221 of the electrode assembly 22.

[0303] Along the thickness direction X of the wall, the second pole piece body 2251 has a first end 2251a away from the wall 211, and the first pole piece body 2231 exceeds the first end 2251a, that is, the first pole piece body 2231 of the first pole piece 223 extends in the thickness direction X of the wall to extend the end of the second pole piece body 2251 of the second pole piece 225 away from the wall 211.

[0304] In this embodiment, by setting the first pole piece body 2231 of the first pole piece 223 to extend beyond the second pole piece body 2251 of the second pole piece 225 and away from the wall portion 211, the main body 221 of the electrode assembly 22 has a smaller density at the end away from the wall portion 211 in the thickness direction X of the wall portion. On the one hand, this facilitates the electrolyte in the outer shell 21 to enter the main body 221 of the electrode assembly 22 through capillary action, which is beneficial to improving the infiltration effect of the electrolyte of the electrode assembly 22, thereby improving the performance of the battery cell 20. On the other hand, when the battery cell 20 suffers from thermal runaway, it can improve the exhaust smoothness inside the electrode assembly 22, which is beneficial to improving the pressure relief rate of the battery cell 20.

[0305] According to some embodiments of the present application, see Figure 8 As shown, along the thickness direction X of the wall portion, the first pole piece body 2231 has a protruding area 2231a that protrudes from the first end 2251a. The length of the protruding area 2231a is L, satisfying 1.5 mm ≤ L ≤ 5 mm.

[0306] The exceeding region 2231 a of the first pole piece body 2231 is a portion of the first pole piece body 2231 of the first pole piece 223 that exceeds the first end 2251 a of the second pole piece body 2251 in the thickness direction X of the wall.

[0307] The length of the excess area 2231a is L, that is, the first pole piece body 2231 of the first pole piece 223 extends in the thickness direction X of the wall portion, and the dimension of the second pole piece body 2251 of the second pole piece 225 away from the wall portion 211 is L. Exemplarily, the length L of the excess 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.

[0308] In this embodiment, by setting the length of the first electrode body 2231 of the first electrode 223 beyond the first end 2251a of the electrode body of the second electrode 225 in the thickness direction X of the wall to 1.5mm to 5mm, on the one hand, the length of the less dense area of ​​the main body 221 of the electrode assembly 22 away from the end of the wall 211 in the thickness direction X of the wall is greater than or equal to 1.5mm, thereby improving the effect of the electrolyte in the shell 21 entering the main body 221 of the electrode assembly 22 through capillary action, so as to further The electrolyte infiltration effect of the electrode assembly 22 is improved in one step, and the exhaust smoothness inside the electrode assembly 22 can be further improved when the battery cell 20 has thermal runaway, which is beneficial to further improve the pressure relief rate of the battery cell 20. On the other hand, the length of the first pole piece body 2231 of the first pole piece 223 exceeding the first end 2251a of the pole piece body of the second pole piece 225 in the thickness direction X of the wall is set to be less than or equal to 5mm, so as to alleviate the phenomenon that the energy density of the electrode assembly 22 is reduced due to excessive waste of the first pole piece 223.

[0309] In some embodiments, see Figure 8 As shown, along the thickness direction X of the wall portion, the first pole piece body 2231 has a protruding area 2231 a that protrudes from the first end 2251 a . The length of the protruding area 2231 a is L, satisfying 2.5 mm ≤ L ≤ 5 mm.

[0310] In this embodiment, by further setting the length of the first pole piece body 2231 of the first pole piece 223 exceeding the first end 2251a of the pole piece body of the second pole piece 225 in the thickness direction X of the wall to be greater than or equal to 2.5 mm, so that the length of the less dense area of ​​the main body 221 of the electrode assembly 22 away from the wall 211 in the thickness direction X of the wall is greater than or equal to 2.5 mm, the effect of the electrolyte in the outer shell 21 entering the main body 221 of the electrode assembly 22 through capillary action can be further improved, so as to further improve the infiltration effect of the electrolyte of the electrode assembly 22, and can further improve the exhaust smoothness inside the electrode assembly 22 when thermal runaway occurs in the battery cell 20, which is conducive to further improving the pressure relief rate of the battery cell 20.

[0311] According to some embodiments of the present application, the first electrode 223 is a negative electrode, and the second electrode 225 is a positive electrode. Of course, in other embodiments, the first electrode 223 can also be the positive electrode of the electrode assembly 22, and correspondingly, the second electrode 225 is the negative electrode of the electrode assembly 22.

[0312] In this embodiment, by setting the first electrode sheet 223 as a negative electrode sheet and correspondingly setting the second electrode sheet 225 as a positive electrode sheet, the negative electrode sheet is configured to extend beyond the positive electrode sheet in the thickness direction X of the wall and away from one end of the wall 211, thereby reducing the risk of ionic metal precipitation in the electrode assembly 22 during use, thereby improving the stability and reliability of the battery cell 20.

[0313] According to some embodiments of the present application, see Figure 8 、 Figure 9 and Figure 10 As shown, the tab 222 includes a plurality of sub-tabs 2221, each of which includes a root portion 2221a, a bent portion 2221b, and a connecting portion 2221c. The root portion 2221a is connected to the main body 221, the bent portion 2221b connects the root portion 2221a and the connecting portion 2221c, and the connecting portion 2221c is electrically connected to the electrode terminal 23. The root portion 2221a extends along the thickness direction X of the wall portion, and the extending direction of the connecting portion 2221c intersects with the extending direction of the root portion 2221a.

[0314] Among them, the pole ear 222 includes multiple sub-pole ears 2221, that is, the pole ear 222 of the electrode assembly 22 is a structure formed by multiple sub-pole ears 2221, that is, the first pole ear 222a of the two pole ears 222 of the electrode assembly 22 is a structure formed by multiple first sub-pole ears 2232 of the first pole piece 223, and the second pole ear 222b is a structure formed by multiple second sub-pole ears 2252 of the second pole piece 225.

[0315] The bent portion 2221b of the sub-electrode tab 2221 is a structure formed by partially bending the sub-electrode tab 2221, so that the sub-electrode tab 2221 forms a root portion 2221a connected to the main body 221, and forms a connecting portion 2221c connected to the electrode terminal 23. Correspondingly, the bent portion 2221b is connected between the root portion 2221a and the connecting portion 2221c. In the embodiment where the first pole piece 223 includes a first pole piece body 2231, the root portion 2221a of the first sub-electrode tab 2232 of the first pole piece 223 is a structure connected to the first pole piece body 2231. Similarly, in the embodiment where the second pole piece 225 includes a second pole piece body 2251, the root portion 2221a of the second sub-electrode tab 2252 of the second pole piece 225 is a structure connected to the second pole piece body 2251.

[0316] The root 2221a extends along the thickness direction X of the wall, and the extension direction of the connecting portion 2221c intersects with the extension direction of the root 2221a. That is, the extension direction of the root 2221a of the sub-pole ear 2221 is consistent with the thickness direction X of the wall, and the extension direction of the connecting portion 2221c and the extension direction of the root 2221a are structures that are arranged at an acute angle, an obtuse angle or a right angle. For example, in an embodiment of the present application, the extension direction of the connecting portion 2221c and the extension direction of the root 2221a are perpendicular or approximately perpendicular to each other.

[0317] In this embodiment, the pole lug 222 is composed of multiple sub-pole lugs 2221, and the sub-pole lug 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 a structure extending 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-pole lug 2221 is a locally bent structure, thereby increasing the area of ​​the connecting portion 2221c in the sub-pole lug 2221 for interconnecting with the electrode terminal 23, which is beneficial to improving the connection stability and current flow capacity between the pole lug 222 and the electrode terminal 23.

[0318] According to some embodiments of the present application, see Figure 8 、 Figure 9 and Figure 10 As shown, the root portion 2221a is provided with a reinforcement portion 2221d on at least one side thereof in the thickness direction.

[0319] The root 2221a may have a reinforcement portion 2221d provided on only one side in the thickness direction of the root 2221a, or may have reinforcement portions 2221d provided on both sides. For example, the root 2221a may have reinforcement portions 2221d provided on both sides in the thickness direction.

[0320] It should be noted that the structure of the reinforcing portion 2221d can be various. If the reinforcing portion 2221d is provided on the root 2221a of the first sub-pole ear 2232 on the first pole piece 223, and in the embodiment where the first pole piece 223 is a negative pole piece, the reinforcing portion 2221d can be a structure in which the negative electrode active material layer of the first pole piece 223 extends to the root 2221a of the first sub-pole ear 2232. Of course, the reinforcing portion 2221d can also be a ceramic layer coated on the root 2221a, or can be bonded to the root 2221a. tape or plastic strip on the root 2221a of the second sub-pole ear 2252 on the second pole piece 225; if a reinforcing portion 2221d is provided on the root 2221a of the second sub-pole ear 2252 on the second pole piece 225, and in the embodiment where the second pole piece 225 is a positive pole piece, the reinforcing portion 2221d can be a structure in which the second insulating layer in the second coating layer of the second pole piece 225 extends to the root 2221a of the second sub-pole ear 2252. Of course, the reinforcing portion 2221d can also be a ceramic layer coated on the root 2221a, or a tape or plastic strip bonded to the root 2221a.

[0321] In some embodiments, see Figure 8 and Figure 10 As shown, the reinforcement portion 2221d is connected to the main body 221 at one end close to the main body 221 in the thickness direction X of the wall portion. Correspondingly, if the reinforcement portion 2221d is arranged on the first pole piece 223, the reinforcement portion 2221d is a structure connected to the first pole piece main body 2231 of the first pole piece 223; if the reinforcement portion 2221d is arranged on the second pole piece 225, the reinforcement portion 2221d is a structure connected to the second pole piece main body 2251 of the second pole piece 225.

[0322] In which, in an embodiment where the electrode assembly 22 also includes an isolation member 224, the isolation member 224 extends beyond the first pole piece body 2231 of the first pole piece 223 and the second pole piece body 2251 of the second pole piece 225 in the thickness direction X of the wall portion, close to one end of the wall portion 211. Correspondingly, one end of the reinforcement portion 2221d is located within the isolation member 224, and the other end extends beyond the end of the isolation member 224 in the thickness direction X of the wall portion, close to one end of the wall portion 211.

[0323] In this embodiment, a reinforcement portion 2221d is provided on at least one side of the root portion 2221a in its thickness direction, so that the structural strength of the root portion 2221a can be improved by the reinforcement portion 2221d, thereby reducing the risk of deformation or cracking of the root portion 2221a during use.

[0324] According to some embodiments of the present application, see Figure 10 As shown, along the thickness direction of the root portion 2221a, the thickness of the reinforcement portion 2221d is D2, satisfying 10um≤D2≤80um.

[0325] Exemplarily, the thickness D2 of the reinforcement portion 2221d can be 10um, 12um, 15um, 18um, 20um, 25um, 30um, 35um, 40um, 45um, 50um, 55um, 60um, 65um, 70um, 75um or 80um, etc.

[0326] It should be noted that if the reinforcement portion 2221d is set on the root 2221a of the first sub-pole ear 2232 of the first pole piece 223, the thickness of the reinforcement portion 2221d is less than or equal to the thickness of the first coating layer of the first pole piece 223; if the reinforcement portion 2221d is set on the root 2221a of the second sub-pole ear 2252 of the second pole piece 225, the thickness of the reinforcement portion 2221d is less than or equal to the thickness of the second coating layer of the second pole piece 225.

[0327] In this embodiment, by setting the thickness of the reinforcement portion 2221d in the thickness direction of the root 2221a to 10um to 80um, on the one hand, setting the thickness of the reinforcement portion 2221d in the thickness direction of the root 2221a to be greater than or equal to 10um is beneficial to improving the structural strength of the reinforcement portion 2221d, so as to enhance the effect of the reinforcement portion 2221d in reinforcing the structural strength of the root 2221a; on the other hand, setting the thickness of the reinforcement portion 2221d in the thickness direction of the root 2221a to be less than or equal to 80um is beneficial to alleviating the phenomenon that the reinforcement portion 2221d occupies too much space or interferes with other components.

[0328] In some embodiments, see Figure 10 As shown, along the thickness direction of the root portion 2221a, the thickness of the reinforcement portion 2221d is D2, satisfying 30um≤D2≤80um.

[0329] 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 30um, it is beneficial to further improve the structural strength of the reinforcing portion 2221d, so as to further improve the effect of the reinforcing portion 2221d in reinforcing the structural strength of the root 2221a.

[0330] According to some embodiments of the present application, see Figure 3 and Figure 4 As shown, the housing 21 is cylindrical, and the central axis of the housing 21 extends along the thickness direction X of the wall.

[0331] The shell 212 of the outer shell 21 is cylindrical, and correspondingly, the end cover 213 is a circular plate-shaped structure.

[0332] It should be noted that, in other embodiments, the shape of the housing 21 may also be a cuboid, a cube, or a prism.

[0333] In this embodiment, the outer shell 21 is configured to be cylindrical, so as to facilitate processing to form a cylindrical battery cell 20 , so that the battery cell 20 has the advantages of high capacity, long cycle life, and wide operating temperature range.

[0334] According to some embodiments of the present application, see Figure 3 、 Figure 4 and Figure 5 As shown, the housing 21 may include a shell 212 and an end cover 213 . A receiving cavity with an opening 2121 is formed inside the shell 212 . The electrode assembly 22 is received in the receiving cavity. The end cover 213 closes the opening 2121 . The end cover 213 is a wall portion 211 .

[0335] Among them, the end cover 213 is the wall portion 211, that is, the electrode terminal 23 is insulated and installed on the end cover 213 of the outer shell 21. Correspondingly, the first pole ear 222a and the second pole ear 222b of the electrode assembly 22 are both arranged on the main body 221 of the electrode assembly 22 facing the end cover 213 in the thickness direction X of the wall portion. Similarly, the first insulating member 24 is located on the side of the end cover 213 away from the electrode assembly 22.

[0336] In this embodiment, by setting the wall portion 211 of the outer shell 21 as the end cover 213 of the outer shell 21 for closing the opening 2121 of the shell 212, the battery cell 20 adopting this structure is convenient for assembling the electrode terminal 23 and the first insulating member 24 on the end cover 213, and can reduce the difficulty of electrically connecting the electrode terminal 23 and the tab 222 to each other, thereby helping to reduce the manufacturing difficulty of the battery cell 20 and improve the production efficiency of the battery cell 20.

[0337] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 may also have other structures. For example, the outer shell 21 may include a shell 212 and an end cover 213. The shell 212 includes an integrally formed side wall and a bottom wall. The side wall is arranged around the bottom wall. 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 is enclosed to form an opening 2121. The side wall and the bottom wall jointly define a 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.

[0338] The shell 212 includes an integrally formed side wall and bottom wall, that is, the shell 212 is manufactured using an integral molding process, such as an integral molding process such as stamping, casting or extrusion molding. In other words, the side wall and bottom wall of the shell 212 are an integral structure.

[0339] 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 the 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.

[0340] In the present 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 alleviated, 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.

[0341] 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.

[0342] As shown in Figure 2 , the battery 100 can further comprise a box body 10, and the battery monomer 20 is accommodated in the box body 10.

[0343] In some embodiments, the box body 10 can comprise a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 are mutually covered, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery monomer 20.

[0344] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-shaped structure, the first box body 11 is covered on the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 is covered on the open side of the second box body 12.

[0345] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be various shapes, such as a cylinder or a cuboid, etc. Exemplarily, in Figure 2 , the box body 10 is a cuboid structure.

[0346] Optionally, the battery monomer 20 arranged in the box body 10 can be one or multiple. Exemplarily, in Figure 2In the battery 100, a plurality of battery cells 20 are arranged in the box 10, and the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are 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 the plurality of battery cells 20 are accommodated in the box 10. Of course, the battery 100 can also be in a form that the plurality of battery cells 20 are connected in series, in parallel, or in a mixed connection to form a battery module, and the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and the whole is accommodated in the box 10.

[0347] The battery 100 can further include other structures. For example, the battery 100 can further include a busbar component connected to the plurality of battery cells 20 to realize electrical connection between the plurality of battery cells 20.

[0348] It should be noted that in some embodiments, the battery 100 can also not be provided with the box 10. The battery 100 includes the plurality of battery cells 20, and the battery 100 composed of the plurality of battery cells 20 can be directly assembled to the electric device to provide electric energy for the electric device by the plurality of battery cells 20. That is, the box 10 can be part of the electric device. Taking the vehicle 1000 as an example, the box 10 can be part of the chassis structure of the vehicle 1000. For example, part of the box 10 can be at least part of the floor of the vehicle 1000, or part of the box 10 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0349] According to some embodiments of the present application, the present application also provides an electric device including the battery cell 20 of any one of the above solutions, and the battery cell 20 is used to provide electric energy for the electric device.

[0350] The electric device can be any one of the devices or systems to which the battery cell 20 is applied.

[0351] 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.

[0352] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: a housing having a wall portion; an electrode assembly housed in the housing, the electrode assembly comprising a main body and two tabs with opposite polarities, the two tabs being a first tab and a second tab, the first tab and the second tab being disposed at one end of the main body close to the wall in a thickness direction of the wall; two electrode terminals, both insulated and mounted on the wall portion, and electrically connected to the first electrode tab and the second electrode tab, respectively, the electrode terminals comprising a connector located on a side of the wall portion away from the electrode assembly, the connectors of the two electrode terminals being a first connector and a second connector, respectively; and a first insulating member, disposed along a thickness direction of the wall portion and on a side of the wall portion facing away from the electrode assembly; Wherein, the first connecting member and the second connecting member are both arranged on the first insulating member and arranged at intervals. Along the thickness direction of the wall portion, part of the first insulating member is located between the first connecting member and the wall portion, and part of the first insulating member is located between the second connecting member and the wall portion.

2. The battery cell according to claim 1, wherein: Along the thickness direction of the wall portion, a mounting groove is provided on a side of the first insulating member facing away from the wall portion, and the first connecting member and the second connecting member are spaced apart and arranged in the mounting groove.

3. The battery cell according to claim 2, characterized in that: A first partition is provided in the assembly groove, the first partition is provided between the first connector and the second connector, and the first partition is configured to insulate and isolate the first connector and the second connector.

4. The battery cell according to claim 3, characterized in that The first partition is provided on the bottom surface of the assembly groove, and opposite ends of the first partition in a direction perpendicular to the thickness direction of the wall portion are connected to the groove side surface of the assembly groove to divide the assembly groove into two receiving grooves; Wherein, the first connecting member and the second connecting member are respectively arranged in the two accommodating grooves.

5. The battery cell according to claim 3, characterized in that: Along the thickness direction of the wall portion, the connecting member has a first surface facing away from the wall portion, and the first partition has a second surface facing 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 according to claim 3, characterized in that The first partition and the first insulating member are integrally formed.

7. The battery cell according to claim 2, characterized in that: The connecting piece extends out of the assembly groove along the thickness direction of the wall portion.

8. The battery cell according to claim 1, wherein: Along a direction perpendicular to the thickness direction of the wall portion, a minimum distance between the first connecting member and the second connecting member is D1, satisfying D1 ≥ 1.5 mm.

9. The battery cell according to claim 8, characterized in that D1≥3mm.

10. The battery cell according to claim 9, characterized in that 4mm≤D1≤8mm.

11. The battery cell according to claim 1, characterized in that 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 arc-shaped.

12. The battery cell according to claim 11, characterized in that In the same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the wall portion is circular, and the orthographic projection of the wall portion and the orthographic projection of the first edge are concentrically arranged.

13. The battery cell according to claim 11, characterized in that The first connecting member and the second connecting member are opposite to each other and spaced apart along a first direction, the first surface has a first area and a second area arranged along a second direction and connected to each other, and the first direction, the second direction and the thickness direction of the wall portion are perpendicular to each other; The edge of the first area includes the first edge, and in a plane perpendicular to the thickness direction of the wall portion, the positive projection of the second area is rectangular, and the edge of the second area includes a second edge, the second edge extends along the second direction, and the second edge is connected to and tangent to the first edge.

14. The battery cell according to claim 13, characterized in that The first area further includes a third edge, and the second area further includes a fourth edge. The fourth edge and the second edge are arranged opposite to each other 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 collinearly.

15. The battery cell according to any one of claims 1 to 14, characterized in that: The wall portion is provided with two mounting holes, the 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, which is inserted into the mounting hole along the thickness direction of the wall portion and is connected to the connector, and the terminal body is electrically connected to the tab.

16. The battery cell according to claim 15, characterized in that Along the thickness direction of the wall portion, two protrusions are protruded from the side of the first insulating member facing the wall portion, each of the protrusions is inserted into one of the mounting holes, and the protrusions are located between the terminal body and the hole wall of the mounting hole to insulate and isolate the wall portion and the terminal body.

17. The battery cell according to claim 16, characterized in that The protrusion is arranged around the terminal body.

18. The battery cell according to claim 15, characterized in that The battery cell further includes two seals, each corresponding to the electrode terminal. The seals are disposed between the terminal body and the wall portion and are configured to seal a gap between the terminal body and a wall surface of the mounting hole.

19. The battery cell according to claim 15, characterized in that A first clamping portion is convexly provided on the outer peripheral surface of the terminal body. Along the thickness direction of the wall portion, the first clamping portion abuts against the connecting member to limit the connecting member from being separated from the wall portion in a direction away from the wall portion.

20. The battery cell according to claim 19, characterized in that The connecting member is provided with a connecting hole, which passes through the connecting member along the thickness direction of the wall portion, and the connecting hole includes a first hole segment and a second hole segment arranged along the thickness direction of the wall portion, the hole diameter of the first hole segment is larger than the hole diameter of the second hole segment, the first hole segment is located at an end of the second hole segment away from the wall portion, and the hole wall surface of the first hole segment and the hole wall surface of the second hole segment are connected by a step surface; The terminal body is inserted into the connection hole along the thickness direction of the wall portion, and at least a portion 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 according to claim 20, characterized in that 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 passes through the first surface; Wherein, along the thickness direction of the wall portion, one end of the terminal body inserted into the connection hole does not protrude from the first surface.

22. The battery cell according to claim 19, characterized in that The outer peripheral surface of the terminal body is also provided with a second clamping portion. Along 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 member.

23. The battery cell according to claim 1, characterized in that The battery cell further comprises: Two current collecting components are both arranged between the wall portion and the main body portion, and one current collecting component is connected to one electrode terminal and one electrode tab.

24. The battery cell according to claim 23, characterized in that The battery cell further comprises: a second insulating member, disposed between the wall portion and the main body portion; The two current collecting components are spaced apart and arranged on the second insulating component, and the second insulating component is configured to insulate and isolate the two current collecting components.

25. The battery cell according to claim 24, characterized in that Part of the current collecting component is embedded in the second insulating member.

26. The battery cell according to claim 25, characterized in that The current collecting member includes 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; Part of the first portion is embedded in the second insulating member, and the first portion is connected to the tab; the second portion is located on a side of the second insulating member away from the main body in the thickness direction of the wall portion, and the second portion is connected to the electrode terminal.

27. The battery cell according to claim 26, characterized in that The second insulating member includes a mounting portion and a second partition portion, a portion of the first part is embedded in the mounting portion, the second partition portion is arranged on a 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 components, and the second partition portion is configured to insulate and isolate the second portions of the two current collecting components.

28. The battery cell according to claim 26, characterized in that The second portion is provided with a through hole, and the through hole passes through both sides of the second portion along the thickness direction of the wall portion; Wherein, along the thickness direction of the wall portion, the electrode terminal is penetrated into the through hole.

29. The battery cell according to claim 23, characterized in that The battery cell further comprises: A third insulating member is disposed between the wall portion and the current collecting member, and is configured to insulate and isolate the current collecting member from the wall portion.

30. The battery cell according to claim 1, characterized in that The electrode assembly includes a first electrode piece and a second electrode piece with opposite polarities, the first electrode piece having a first electrode piece body and a first sub-electrode tab, the first sub-electrode tab being connected to one end of the first electrode piece body close to the wall in the thickness direction of the wall portion, the second electrode piece having a second electrode piece body and a second sub-electrode tab, the second sub-electrode tab being connected to one end of the second electrode piece body close to the wall in the thickness direction of the wall portion, all the first sub-electrode tabs in the electrode assembly forming the first electrode tab, and all the second sub-electrode tabs in the electrode assembly forming the second electrode tab, and the main body including the first electrode piece body and the second electrode piece body; Wherein, along the thickness direction of the wall portion, the second pole piece body has a first end away from the wall portion, and the first pole piece body exceeds the first end.

31. The battery cell according to claim 30, characterized in that Along the thickness direction of the wall portion, the first pole piece body has a protruding area beyond the first end, and the length of the protruding area is L, which satisfies 1.5 mm ≤ L ≤ 5 mm.

32. The battery cell according to claim 31, characterized in that 2.5mm≤L≤5mm.

33. The battery cell according to claim 30, characterized in that The first electrode is a negative electrode, and the second electrode is a positive electrode.

34. The battery cell according to claim 1, characterized in that The tab includes a plurality of sub-tabs, each of which includes a root portion, a bent portion, and a connecting portion, wherein the root portion is connected to the main portion, the bent portion connects the root portion and the connecting portion, and the connecting portion is electrically connected to the electrode terminal; The root portion extends along a thickness direction of the wall portion, and an extending direction of the connecting portion intersects with an extending direction of the root portion.

35. The battery cell according to claim 34, characterized in that The root portion is provided with a reinforcement portion on at least one side thereof in a thickness direction.

36. The battery cell according to claim 35, characterized in that Along the thickness direction of the root, the thickness of the reinforcement portion is D2, satisfying 10um≤D2≤80um.

37. The battery cell according to claim 36, characterized in that 30um≤D2≤80um.

38. The battery cell according to claim 1, characterized in that The shell is cylindrical, and the central axis of the shell extends along the thickness direction of the wall portion.

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

40. The battery cell according to claim 1, wherein The housing comprises: The housing includes an integrally formed side wall and a bottom wall, wherein the side wall is disposed around the bottom wall, and along the thickness direction of the wall portion, one end of the side wall is connected to the bottom wall, and the other end is enclosed to form an opening, and the side wall and the bottom wall jointly define a receiving cavity, and the electrode assembly is received in the receiving cavity; an end cap for closing the opening; Wherein, the bottom wall is the wall portion.

41. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 40.

42. An electrical device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 40, wherein the battery cell is used to provide electrical energy.

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