Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery cell includes a housing, an electrode assembly, and a first insulator. The electrode assembly is housed within the housing. The first insulator is provided between the wall portion and the electrode assembly. The wall part is provided with a first surface facing the electrode assembly, the first surface is provided with a first groove, the first insulating part is provided with a second surface deviating from the wall part and a third surface facing the wall part, the second surface is provided with a second groove, a first protrusion is formed in the position, corresponding to the second groove, of the third surface, and at least part of the first protrusion is contained in the first groove. The first insulator and the wall portion share a space in the thickness direction of the wall portion while the insulation thickness of the portion, located between the electrode assembly and the wall portion, of the first insulator is met, and the space of the side, facing the electrode assembly, of the first insulator can be enlarged. Therefore, the space for accommodating the electrode assembly in the battery cell is increased.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Battery devices, as core components of new energy vehicles, have high requirements in terms of performance.

[0003] In battery technology, a battery cell typically includes a casing and an electrode assembly housed within the casing. To reduce the risk of short circuits in the battery cell, an insulating component is usually placed between the casing and the electrode assembly. However, existing battery cells have a lot of space occupied by the insulating component and other parts within the casing, which limits the space available for the electrode assembly and thus hinders the improvement of the volumetric energy density of the battery cell. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device, which can effectively improve the volumetric energy density of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode assembly, and a first insulating member; the housing has a wall portion; the electrode assembly is housed within the housing; at least a portion of the first insulating member is located between the wall portion and the electrode assembly; wherein, along the thickness direction of the wall portion, the wall portion has a first surface facing the electrode assembly, the first surface is provided with a first groove, the first insulating member has a second surface facing away from the wall portion and a third surface facing the wall portion, the second surface is provided with a second groove, and the third surface has a first protrusion formed at a position corresponding to the second groove, at least a portion of the first protrusion is housed within the first groove.

[0006] In the above technical solution, a first groove is provided on the first surface of the wall facing the electrode assembly, a second groove is provided on the second surface of the first insulating member away from the wall, and a first protrusion is provided on the third surface of the first insulating member facing the wall and corresponding to the position of the second groove. By setting at least a portion of the first protrusion to be accommodated in the first groove, the insulation thickness of the portion of the first insulating member located between the electrode assembly and the wall is satisfied, while also enabling the first insulating member and the wall to share a portion of space in the thickness direction of the wall, and expanding the space on the side of the first insulating member facing the electrode assembly, thereby effectively increasing the internal space of the battery cell for accommodating the electrode assembly, which is beneficial to improving the internal space utilization rate of the battery cell and thus improving the volumetric energy density of the battery cell.

[0007] In some embodiments, the electrode assembly includes a body portion and a tab, the tab being connected to one end of the body portion facing the wall portion in the thickness direction; the battery cell further includes an electrode lead-out member disposed on the wall portion, the electrode lead-out member including a first connecting portion electrically connected to the tab, and a portion of a first insulating member located between the first connecting portion and the wall portion; wherein, along the thickness direction of the wall portion, at least a portion of the first connecting portion and at least a portion of the tab are both accommodated within a second groove.

[0008] In the above technical solution, the tab of the electrode assembly is disposed at the end of the main body facing the wall, and the first connecting part of the electrode lead is connected to the tab to realize the electrical connection between the electrode lead and the electrode assembly, so that the electrical energy of the battery cell can be input or output through the electrode lead. In this way, by setting at least a portion of the first connecting part and at least a portion of the tab to be accommodated in the second groove, the first insulating member can be used to insulate and isolate the tab and the wall, as well as the first connecting part and the wall, while also achieving the effect of the first insulating member insulating and the wall sharing a portion of space in the thickness direction of the wall. In addition, while ensuring that there is sufficient space between the first insulating member and the main body to accommodate the first connecting part and the tab, the first insulating member and the first connecting part, as well as the first insulating member and the tab, can share a portion of space in the thickness direction of the wall. This reduces the phenomenon of the first insulating member pressing down on the tab and satisfies the insulation and isolation effect between the tab and the wall, while further increasing the internal space of the battery cell for accommodating the main body of the electrode assembly, which is beneficial to further improve the volumetric energy density of the battery cell.

[0009] In some embodiments, a limiting portion is provided on the bottom surface of the second groove, and the limiting portion surrounds the outer periphery of the first connecting portion.

[0010] In the above technical solution, by providing a limiting part protruding from the bottom surface of the second groove, and the limiting part being a structure surrounding the first connecting part, the limiting part can play a certain limiting and positioning role for the first connecting part. On the one hand, it can reduce the shaking phenomenon of the first connecting part during use, which is conducive to improving the stability of the first connecting part in the second groove. On the other hand, it can reduce the difficulty of assembling at least part of the first connecting part into the second groove, thereby reducing the assembly difficulty between the first insulating part and the electrode lead-out part, which is conducive to improving the assembly efficiency of the battery cell.

[0011] In some embodiments, the limiting portion is an annular structure extending circumferentially along the first connecting portion.

[0012] In the above technical solution, by setting the limiting part as a ring structure surrounding the first connecting part, the effect of the limiting part in limiting and positioning the first connecting part can be further improved, and the difficulty of protruding the limiting part on the bottom surface of the second groove can be reduced.

[0013] In some embodiments, the limiting portion is configured to divide the second groove into a first groove and a second groove, the first groove being located inside the limiting portion and the second groove being located outside the limiting portion; wherein at least a portion of the first connecting portion is accommodated in the first groove, at least a portion of the electrode tab is accommodated in the second groove, and the second groove is disposed around the first groove.

[0014] In the above technical solution, the limiting part divides the second groove into a first groove located inside the limiting part and a second groove located outside the limiting part, so that the second groove is a structure surrounding the outside of the first groove, and at least a portion of the first connecting part and at least a portion of the electrode tab are respectively accommodated in the first groove and the second groove, so that the first groove for accommodating the first connecting part and the second groove for accommodating the electrode tab in the second groove are independent structures. The battery cell with this structure can reduce the interference between the first connecting part and the electrode tab, and facilitate the assembly of at least a portion of the first connecting part and at least a portion of the electrode tab into the second groove, which helps to reduce the assembly difficulty between the electrode lead and the first insulating part and the electrode assembly and the first insulating part, thereby improving the assembly efficiency of the battery cell.

[0015] In some embodiments, the tab includes a connecting region and a bending region; the connecting region is located on the side of the first connecting portion away from the wall portion in the thickness direction of the wall portion and is connected to the first connecting portion; the bending region connects the connecting region and the main body portion; wherein, along the thickness direction of the wall portion, at least a portion of the bending region is accommodated within the second groove.

[0016] In the above technical solution, the electrode tab has a connection area located on the side of the first connecting portion away from the wall portion in the thickness direction of the wall portion and connected to the first connecting portion. The electrode tab also has a bending area connecting the connection area and the main body portion to realize the electrical connection between the electrode assembly and the electrode lead-out member. By setting at least a portion of the bending area of ​​the electrode tab to be accommodated in the second groove along the thickness direction of the wall portion, while realizing that the electrode tab and the first insulating member share a portion of space in the thickness direction of the wall portion, it is also possible to realize that there is sufficient space between the first insulating member and the main body portion to accommodate the bending area. On the one hand, it is convenient to bend the electrode tab to realize the connection area of ​​the electrode tab to be connected to the first connecting portion, which helps to reduce the difficulty of bending the electrode tab and the assembly difficulty between the electrode tab and the first connecting portion. On the other hand, it can alleviate the phenomenon of the first insulating member pressing down on the bending area of ​​the electrode tab, which helps to reduce the risk of damage to the bending area of ​​the electrode tab.

[0017] In some embodiments, the bending area is bent to form a plurality of bending segments, which are connected sequentially, and the bending segments located at both ends of the plurality of bending segments are respectively connected to the connecting area and the main body.

[0018] In the above technical solution, the bending area of ​​the electrode tab is set as a structure of multiple bending segments connected in sequence, and the bending segments at both ends of the multiple bending segments are connected to the connecting area and the main body respectively, so as to realize the bending structure of the electrode tab. The battery cell with this structure can reduce the difficulty of forming the bending area of ​​the electrode tab, so as to realize that the electrode tab has a connecting area on the side of the first connecting part away from the wall in the thickness direction of the wall. On the other hand, the bending area can play a certain buffering role between the connecting area and the main body, which helps to reduce the phenomenon of rigid tension between the connecting area and the main body.

[0019] In some embodiments, the battery cell includes two electrode leads, which are spaced apart on the wall portion along a first direction; the electrode assembly includes two tabs of opposite polarity, each tab being connected to one end of the main body portion facing the wall portion in the thickness direction, and the two tabs are spaced apart along the first direction, with each tab connected to the first connecting portion of one of the electrode leads; wherein the bending region and the first connecting portion are arranged along a second direction, and the thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other.

[0020] In the above technical solution, the battery cell is further provided with two electrode leads arranged at intervals along a first direction, and the electrode assembly is correspondingly provided with two tabs arranged at intervals along the first direction. The two tabs are respectively connected to the two electrode leads to realize the input or output of electrical energy of the battery cell. In this way, by setting the bending area of ​​the tab and the first connecting part of the electrode lead to be arranged in a structure along a second direction, the arrangement direction of the bending area and the first connecting part is perpendicular to the arrangement direction of the two tabs. This facilitates the bending of the tabs to form a bending section and reduces the assembly difficulty between the tabs and the first connecting part. On the other hand, it optimizes the internal space arrangement of the battery cell, which is beneficial to improve the internal space utilization of the battery cell and reduces the interference between the bending areas of the two tabs.

[0021] In some embodiments, the bottom surface of the first groove is provided with an electrode lead-out hole, and the electrode lead-out member further includes a lead-out portion and a second connecting portion. Along the thickness direction of the wall portion, the lead-out portion is located on the side of the wall portion away from the electrode assembly, and the second connecting portion passes through the electrode lead-out hole and connects the lead-out portion and the first connecting portion. In other embodiments, the bottom surface of the second groove is provided with a through hole. Along the thickness direction of the wall portion, the through hole is correspondingly provided with the electrode lead-out hole, and the second connecting portion passes through the through hole.

[0022] In the above technical solution, by providing an electrode lead-out hole on the bottom surface of the first groove of the wall and providing a through hole corresponding to the electrode lead-out hole on the bottom surface of the second groove of the first insulating member, the second connecting part of the electrode lead-out member can pass through the electrode lead-out hole and the through hole in sequence along the thickness direction of the wall and connect to the lead-out part and the first connecting part located on both sides of the wall. This enables the electrode lead-out member to be electrically connected to the electrode assembly and to input or output the electrical energy of the battery cell through the electrode lead-out member. The structure is simple and can reduce the assembly difficulty of the first insulating member and the assembly difficulty between the electrode lead-out member and the tab, which is beneficial to improving the assembly efficiency of the battery cell.

[0023] In some embodiments, the second connecting portion is riveted to the lead-out portion.

[0024] In the above technical solution, by setting the second connecting part and the lead-out part as a riveted structure, it is beneficial to improve the connection stability between the second connecting part and the lead-out part, so as to reduce the risk of connection failure of the electrode lead-out part during use, and also to reduce the connection difficulty between the second connecting part and the lead-out part, so as to improve the assembly efficiency of the battery cell.

[0025] In some embodiments, the first connecting portion and the second connecting portion are integrally formed.

[0026] In the above technical solution, by setting the first connecting part and the second connecting part as an integrally formed structure, on the one hand, the connection stability between the first connecting part and the second connecting part can be improved to reduce the risk of connection failure of the electrode lead during use. On the other hand, the assembly and connection process of the first connecting part and the second connecting part can be reduced during the assembly of the battery cell, which is conducive to optimizing the production cycle of the battery cell and improving the assembly efficiency of the battery cell.

[0027] In some embodiments, along the thickness direction of the wall portion, the second connecting portion protrudes from the surface of the first connecting portion facing the wall portion.

[0028] In the above technical solution, by setting the second connecting part as a structure that protrudes from the surface of the first connecting part facing the wall, on the one hand, the assembly difficulty of the second connecting part passing through the through hole and the electrode lead-out hole can be reduced, thereby reducing the assembly difficulty of the battery cell. On the other hand, the space occupied by the first connecting part and the second connecting part in the direction perpendicular to the thickness of the wall can be saved, which is conducive to optimizing the internal space layout of the battery cell.

[0029] In some embodiments, the first connecting portion and the second connecting portion are separately disposed.

[0030] In the above technical solution, by setting the first connecting part and the second connecting part as separate structures, it is beneficial to improve the assembly flexibility of the electrode lead-out parts, so that the positions of the first connecting part and the second connecting part can be adjusted according to the actual assembly situation to meet the assembly application scenarios of different battery cells.

[0031] In some embodiments, the first connecting portion and the second connecting portion are welded together.

[0032] In the above technical solution, by setting the first connecting part and the second connecting part to be welded to each other, the connection stability between the first connecting part and the second connecting part can be improved, thereby reducing the risk of connection failure of the electrode lead during use.

[0033] In some embodiments, the battery cell further includes a second insulating member, at least a portion of which is disposed between the wall portion and the lead-out portion.

[0034] In the above technical solution, the battery cell is further provided with a second insulating member, and at least a portion of the second insulating member is disposed between the wall portion and the lead portion, so that the second insulating member can achieve insulation isolation between the wall portion and the lead portion of the electrode lead, thereby reducing the risk of short circuit between the wall portion and the lead portion during use and improving the reliability of the battery cell.

[0035] In some embodiments, the wall portion has a fourth surface facing away from the electrode assembly in the thickness direction of the wall portion, the fourth surface is provided with a mounting groove, the mounting groove and the first groove are correspondingly provided along the thickness direction of the wall portion, and the electrode lead-out hole communicates the mounting groove and the first groove; wherein, along the thickness direction of the wall portion, at least a portion of the second insulating member is accommodated in the mounting groove.

[0036] In the above technical solution, by providing an assembly groove on the fourth surface of the wall, and at least a portion of the second insulating member being accommodated in the assembly groove along the thickness direction of the wall, the battery cell with this structure can, on the one hand, limit and position the second insulating member through the assembly groove, which helps to reduce the difficulty of assembling the second insulating member between the wall and the lead-out part, and can reduce the phenomenon of shaking or displacement of the second insulating member during use, which helps to improve the assembly stability of the second insulating member. On the other hand, it can realize that the second insulating member and the wall share part of the space in the thickness direction of the wall, which helps to optimize the volume of the battery cell.

[0037] In some embodiments, along the thickness direction of the wall portion, the minimum distance between the bottom surface of the mounting groove and the bottom surface of the first groove is L2, satisfying 0.5mm≤L2≤3mm.

[0038] In the above technical solution, by setting the minimum distance between the bottom surface of the assembly groove and the bottom surface of the first groove to 0.5mm to 3mm, the minimum distance in the thickness direction of the portion of the wall located between the bottom surface of the assembly groove and the bottom surface of the first groove is 0.5mm to 3mm. On the one hand, this can improve the structural strength of the portion of the wall located between the bottom surface of the assembly groove and the bottom surface of the first groove, which helps to alleviate deformation or cracking in the area of ​​the wall used for assembling electrode leads, thereby improving the reliability of the battery cell. On the other hand, it can save the space occupied by the portion of the wall located between the bottom surface of the assembly groove and the bottom surface of the first groove in the thickness direction of the wall, thereby optimizing the length dimension of the second connecting part of the electrode lead in the thickness direction of the wall, so as to facilitate the second connecting part to be inserted into the electrode lead hole, and reduce the manufacturing cost of the second connecting part.

[0039] In some embodiments, the battery cell further includes a seal; the seal is disposed between the second connection portion and the wall portion, and the seal is configured to seal the gap between the second connection portion and the wall surface of the electrode lead-out hole.

[0040] In the above technical solution, the battery cell is also provided with a sealing element. By placing the sealing element between the wall and the second connecting part of the electrode lead, the sealing element can seal the gap between the second connecting part of the electrode lead and the hole wall of the electrode lead, thereby reducing the risk of leakage at the electrode lead of the battery cell and improving the stability and reliability of the battery cell.

[0041] In some embodiments, the wall portion has a fourth surface facing away from the electrode assembly in the thickness direction of the wall portion, the distance between the fourth surface and the first surface is D in the thickness direction of the wall portion, and the groove depth of the first groove is H, satisfying 0.05≤H / D≤0.875.

[0042] In the above technical solution, by setting the ratio of the groove depth of the first groove to the distance between the first surface and the fourth surface to 0.05 to 0.875, the groove depth of the first groove is 0.05 to 0.875 of the wall thickness of the area where the first groove is set in the wall. On the one hand, this can improve the effect of the first groove in accommodating the first protrusion of the first insulating member, which is conducive to increasing the shared space between the wall and the first insulating member in the thickness direction of the wall, thereby improving the internal space utilization of the battery cell. On the other hand, it can alleviate the phenomenon of weak structural strength in the area where the first groove is set in the wall, which is conducive to improving the structural strength of the area where the first groove is set in the wall, thereby reducing the risk of deformation or cracking of the wall during use.

[0043] In some embodiments, 1mm ≤ D ≤ 4mm.

[0044] In the above technical solution, by setting the distance between the first surface and the fourth surface to 1mm to 4mm, the wall thickness of the area of ​​the wall portion used to set the first groove is 1mm to 4mm. On the one hand, it can improve the structural strength of the wall portion, reduce the risk of deformation or cracking during use, and reduce the difficulty of opening the first groove on the first surface of the wall portion. On the other hand, it can save the space occupied by the wall portion and reduce the weight of the wall portion, which is beneficial to improving the energy density of the battery cell.

[0045] In some embodiments, the housing includes a shell and an end cap; the interior of the shell has an opening in a receiving cavity in which the electrode assembly is received; the end cap closes the opening; wherein the end cap is the wall portion.

[0046] In the above technical solution, by setting the wall of the outer casing as an end cap for closing the opening of the casing, the battery cell with this structure is easy to assemble electrode leads on the wall and can reduce the assembly difficulty between the tab and the first connection part of the electrode lead, thereby helping to reduce the manufacturing difficulty of the battery cell and improve the production efficiency of the battery cell.

[0047] In some embodiments, at least a portion of the wall portion is inserted into the receiving cavity from the opening, the wall portion having a first outer peripheral surface that abuts against the inner peripheral surface of the housing, and the wall portion being welded to the housing; wherein, the minimum distance between the groove side surface of the first groove and the first outer peripheral surface is L1, satisfying 1mm≤L1≤5mm.

[0048] In the above technical solution, at least a portion of the wall is inserted into the receiving cavity, and the wall and the shell are welded together to achieve a closed opening of the wall. By setting the minimum distance between the side surface of the first groove and the first outer peripheral surface of the wall to 1mm to 5mm, on the one hand, the thickness of the portion of the wall located between the side surface of the first groove and the first outer peripheral surface can be increased, thereby reducing the influence of the first groove on the welding position of the wall and the shell, which can effectively improve the welding penetration between the wall and the shell, and is conducive to improving the welding stability and welding quality between the wall and the shell. On the other hand, it can alleviate the phenomenon that the area where the first groove is set on the wall is limited due to the excessive minimum distance between the side surface of the first groove and the first outer peripheral surface of the wall, thereby reducing the difficulty of setting the first groove on the first surface of the wall and reducing the difficulty of assembling the first protrusion into the first groove.

[0049] In some embodiments, 1.5mm ≤ L1 ≤ 4mm.

[0050] In the above technical solution, by further setting the minimum distance between the side surface of the first groove and the first outer peripheral surface of the wall to 1.5mm to 4mm, on the one hand, the thickness of the part of the wall located between the side surface of the first groove and the first outer peripheral surface can be further increased, so as to further reduce the influence of the first groove on the welding position of the wall and the shell, thereby further improving the welding penetration between the wall and the shell, which is conducive to further improving the welding stability and welding quality between the wall and the shell. On the other hand, it can further alleviate the phenomenon of the limited area of ​​the wall where the first groove is set, thereby further reducing the difficulty of setting the first groove on the first surface of the wall, and further reducing the difficulty of assembling the first protrusion into the first groove.

[0051] In some embodiments, the wall portion includes a body portion and an edge portion; along the thickness direction of the wall portion, a portion of the body portion is inserted into the receiving cavity through the opening, the body portion having a first outer peripheral surface and the body portion having a first surface; the edge portion protrudes from the first outer peripheral surface, and the edge portion abuts against the end of the housing having the opening along the thickness direction of the wall portion.

[0052] In the above technical solution, the wall portion is provided with a body portion and an edge portion. The body portion has a first outer peripheral surface that abuts against the inner peripheral surface of the shell and a first surface for providing a first groove. By setting the edge portion of the wall portion to be protruding from the first outer peripheral surface and abutting against the end of the shell with an opening along the thickness direction of the wall portion, the body portion of the wall portion can close the opening and provide the first groove, while the edge portion can also play a certain limiting and positioning role for the body portion. This helps to reduce the assembly difficulty between the wall portion and the shell and improve the assembly quality between the wall portion and the shell.

[0053] In some embodiments, the edge portion is an annular structure surrounding the body portion.

[0054] In the above technical solution, by setting the edge portion as a ring structure surrounding the outer side of the main body portion, the effect of the edge portion in limiting and positioning the main body portion can be further improved. On the one hand, it can further reduce the assembly difficulty between the wall portion and the housing, and further improve the assembly quality between the wall portion and the housing. On the other hand, it can also improve the sealing effect of the wall portion on the opening of the housing, so as to reduce the risk of leakage of the battery cell during use.

[0055] In some embodiments, the housing includes a shell and an end cap; the shell includes an integrally formed sidewall and a bottom wall, the sidewall surrounding the bottom wall, one end of the sidewall being connected to the bottom wall along the thickness direction of the wall portion, and the other end forming an opening, the sidewall and the bottom wall together defining a receiving cavity, the electrode assembly being received within the receiving cavity; the end cap closes the opening; wherein, the bottom wall is the wall portion.

[0056] In the above technical solution, by setting the wall of the outer casing as the bottom wall opposite to the end cap, the wall with the electrode lead can be moved away from the end cap. This can alleviate the stress caused by the pulling or twisting of the electrode lead by other components and transmit it to the connection position of the end cap and the casing. In this way, the risk of connection failure of the end cap and the casing during use can be reduced, thereby improving the stability and reliability of the battery cell.

[0057] In some embodiments, the electrode assembly includes a main body and an electrode tab, the electrode tab being connected to one end of the main body facing the wall in the thickness direction of the wall; wherein, a second protrusion is provided on the second surface, and the second protrusion abuts against the main body along the thickness direction of the wall.

[0058] In the above technical solution, by providing a second protrusion on the second surface of the first insulating member where the second groove is provided, and the second protrusion having a structure that abuts against the main body of the electrode assembly in the thickness direction of the wall portion, the first insulating member and the main body of the electrode assembly can also play a role in mutual positioning and stabilization, thereby improving the stability of the first insulating member between the main body and the wall portion, and improving the stability of the electrode assembly inside the housing, which helps to reduce the risk of shaking or displacement of the first insulating member and the electrode assembly during use.

[0059] In some embodiments, the Vickers hardness of the area of ​​the wall portion on the first surface where the first groove is not provided is HV1, and the Vickers hardness of the area of ​​the wall portion on the first surface where the first groove is provided is HV2, satisfying that 1≤HV2-HV1≤10.

[0060] In the above technical solution, by setting the Vickers hardness of the area where the first groove is formed on the first surface of the wall to be 1 to 10 greater than the Vickers hardness of the area where the first groove is not formed on the first surface of the wall, the structure of the area where the first groove is formed on the wall can be formed by stamping. The battery cell with this structure can reduce the forming difficulty of the wall, thereby reducing the manufacturing difficulty of the battery cell. On the other hand, it can effectively improve the structural strength of the area where the wall is thinned, thereby reducing the risk of deformation or cracking in the area where the first groove is set on the wall during use.

[0061] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0062] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell or battery device. Attached Figure Description

[0063] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0064] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0065] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0066] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0067] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0068] Figure 5 A partial cross-sectional view of a battery cell perpendicular to a first direction, provided for some embodiments of this application;

[0069] Figure 6 for Figure 5 A magnified view of part A of the shown battery cell;

[0070] Figure 7 A schematic diagram of the structure of the wall portion of the housing provided in some embodiments of this application;

[0071] Figure 8 This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application;

[0072] Figure 9 Axonal view of a first insulating element provided for some embodiments of this application;

[0073] Figure 10 A cross-sectional view of the wall portion of the housing provided in some embodiments of this application, perpendicular to a first direction;

[0074] Figure 11 This is an exploded view of the structure of the electrode leads of a battery cell provided in some embodiments of this application.

[0075] Icons: 1000 - Vehicle; 100 - Battery assembly; 10 - Housing; 11 - First housing body; 12 - Second housing body; 20 - Battery cell; 21 - Housing; 211 - Wall; 2111 - Body; 2111a - First surface; 2111b - First groove; 2111c - Electrode lead-out hole; 2111d - Fourth surface; 2111e - First outer peripheral surface; 2111f - Assembly groove; 2112 - Edge; 212 - Housing; 2121 - Opening; 2122 - Bottom wall; 2123 - Side wall; 213 - End cap; 22 - Electrode assembly; 221 - Main body; 222 - Tab; 2221 - 2222-Bending area; 2222a-Bending section; 23-Electrode lead-out; 231-First connecting part; 232-Lead-out part; 2321-Rivet hole; 233-Second connecting part; 24-First insulating part; 241-Second surface; 2411-Second groove; 2411a-First groove; 2411b-Second groove; 2412-Second protrusion; 242-Third surface; 2421-First protrusion; 243-Limiting part; 244-Through hole; 25-Second insulating part; 26-Sealing part; 200-Controller; 300-Motor; X-Thickness direction of the wall; Y-First direction; Z-Second direction. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0077] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0078] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0079] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0080] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0081] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0082] In this application, "multiple" means two or more (including two).

[0083] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0084] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0085] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0086] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0087] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0088] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors 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 substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0089] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0090] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0091] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0092] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can 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.).

[0093] 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.

[0094] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0095] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0096] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0097] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0098] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0099] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0100] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0101] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0102] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0103] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0104] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0105] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0106] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0107] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0108] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0109] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0110] In some implementations, the electrode assembly has a stacked structure.

[0111] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0112] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0113] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0114] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0115] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0116] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0117] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0118] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0119] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0120] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0121] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0122] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0123] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0124] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0125] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0126] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0127] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0128] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0129] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0130] For a typical battery cell, it includes a casing and an electrode assembly housed within the casing. The end cap of the casing has electrode leads. By connecting the electrode leads to the tabs of the electrode assembly, the battery cell can input or output electrical energy. To reduce the risk of short circuits between the electrode assembly and the end cap, an insulating component is typically placed between them. The insulating component has a receiving groove on its side facing the electrode assembly, with the tabs extending into this groove and the electrode leads located within it. This allows the electrode leads to connect to the tabs while simultaneously providing insulation between the tabs and the end cap. In related technologies, to ensure sufficient bending space for the tabs to better fit within the receiving groove of the insulating component and connect with the electrode leads, the insulating component is typically thickened. This increases the depth of the receiving groove while maintaining insulation between the tabs and the end cap. However, this structure results in the insulating component occupying a significant amount of space inside the casing, limiting the space available for accommodating the electrode assembly and hindering the improvement of the battery cell's volumetric energy density.

[0131] Based on the above considerations, in order to solve the problem of low volumetric energy density of battery cells, embodiments of this application provide a battery cell including a casing, an electrode assembly, and a first insulating member. The casing has a wall. The electrode assembly is housed within the casing. At least a portion of the first insulating member is located between the wall and the electrode assembly. Along the thickness direction of the wall, the wall has a first surface facing the electrode assembly, and the first surface is provided with a first groove. The first insulating member has a second surface facing away from the wall and a third surface facing the wall. The second surface is provided with a second groove, and the third surface has a first protrusion formed at a position corresponding to the second groove. At least a portion of the first protrusion is accommodated within the first groove.

[0132] In this battery cell structure, a first groove is provided on the first surface of the wall facing the electrode assembly, a second groove is provided on the second surface of the first insulating member away from the wall, and a first protrusion is provided on the third surface of the first insulating member facing the wall at the position corresponding to the second groove. By setting at least a portion of the first protrusion to be accommodated in the first groove, the insulation thickness of the portion of the first insulating member located between the electrode assembly and the wall is satisfied, while also enabling the first insulating member and the wall to share a portion of space in the thickness direction of the wall. Furthermore, the space on the side of the first insulating member facing the electrode assembly can be expanded, thereby effectively increasing the internal space of the battery cell for accommodating the electrode assembly. This is beneficial for improving the internal space utilization rate of the battery cell and thus increasing the volumetric energy density of the battery cell.

[0133] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices disclosed in this application can be used to construct such an electrical device. This helps alleviate the problem of limited space within the casing for accommodating electrode components, thereby increasing the volumetric energy density of the battery cells.

[0134] This application provides an electrical device that uses a single battery cell or battery assembly as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0135] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0136] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0137] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0138] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0139] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0140] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0141] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0142] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0143] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0144] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 , Figure 6 , Figure 7, Figure 8 and Figure 9 , Figure 4 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 5 This is a partial cross-sectional view of a battery cell 20 provided in some embodiments of this application, perpendicular to the first direction Y. Figure 6 for Figure 5 A magnified view of part A of the battery cell 20 shown. Figure 7 This is a schematic diagram of the structure of the wall portion 211 of the outer casing 21 provided in some embodiments of this application. Figure 8 This is a schematic diagram of the structure of the first insulating member 24 provided in some embodiments of this application. Figure 9 This is an axial view of a first insulating member 24 provided in some embodiments of this application. This application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, an electrode lead-out member 23, and a first insulating member 24. The housing 21 has a wall portion 211. The electrode assembly 22 is housed within the housing 21 and includes a body portion 221 and a tab 222. The tab 222 is connected to one end of the body portion 221 facing the wall portion 211 in the thickness direction X of the wall portion. The electrode lead-out member 23 is disposed on the wall portion 211 and is electrically connected to the tab 222 of the electrode assembly 22. The first insulating member 24 is disposed within the housing 21, and at least a portion of the first insulating member 24 is located between the wall portion 211 and the electrode assembly 22. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2111a facing the electrode assembly 22, and the first surface 2111a is provided with a first groove 2111b. The first insulating member 24 has a second surface 241 facing away from the wall portion 211 and a third surface 242 facing the wall portion 211. The second surface 241 is provided with a second groove 2411, and the third surface 242 is formed with a first protrusion 2421 at a position corresponding to the second groove 2411. At least a portion of the first protrusion 2421 is accommodated in the first groove 2111b.

[0145] The outer shell 21 can also be used to contain electrolytes, such as electrolyte solution. The outer shell 21 can have various structural forms, such as a cylinder or a cuboid. Similarly, the outer shell 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0146] 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, it can protect the electrode assembly 22 and prevent, to some extent, electrolyte leakage. When the housing 21 is a non-sealed structure, it can still protect the electrode assembly 22, and a sealing bag may be included between the housing 21 and the electrode assembly 22. The sealing bag is used to encapsulate the electrode assembly 22 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film.

[0147] Optionally, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity for accommodating the electrode assembly 22 and has an opening 2121. That is, the housing 212 is a hollow structure with an opening 2121 at one end. The end cap 213 covers the opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0148] The housing 212 includes a bottom wall 2122 and a side wall 2123. The bottom wall 2122 is disposed opposite to the end cap 213. The side wall 2123 surrounds the bottom wall 2122, and one end of the side wall 2123 is connected to the bottom wall 2122, while the other end forms an opening 2121.

[0149] It should be noted that the wall portion 211 with the first groove 2111b and for mounting the electrode lead 23 can be the end cap 213 of the housing 21, or it can be a wall of the housing 212 of the housing 21. For example, in Figure 3 and Figure 4 In this embodiment, the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be the bottom wall 2122 of the housing 212 and the end cap 213 being disposed opposite to each other, or the wall portion 211 can also be the side wall 2123 of the housing 212 and the end cap 213 being adjacent to and connected to each other.

[0150] When assembling the battery cell 20, the electrode assembly 22 can be placed into the housing 212 first, and the electrolyte can be filled into the housing 212. Then, the end cap 213 can be closed onto the opening 2121 of the housing 212 to complete the assembly of the battery cell 20.

[0151] The housing 212 can have various shapes, such as a cylinder, cuboid, or prism. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylinder, a cylindrical housing 212 can be used; if the electrode assembly 22 is a cuboid, a cuboid housing 212 can be used. Of course, the end cap 213 can also have various structures, such as a plate-like structure or a hollow structure open at one end. For example, in… Figure 3 and Figure 4 In the middle, the shell 212 has a cuboid structure.

[0152] Of course, it is understandable that the outer casing 21 is not limited to the structure described above. The outer casing 21 can also be other structures. For example, the outer casing 21 can include a housing 212 and two end caps 213. The housing 212 is a hollow structure with openings 2121 formed on both opposite sides. One end cap 213 is fitted onto one opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the housing 212 has openings 2121 formed on both opposite sides, and the two end caps 213 are fitted onto both sides of the housing 212 to close the corresponding openings 2121.

[0153] Optionally, the structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a wound structure formed by winding a positive electrode, an insulating element and a negative electrode, or a stacked structure formed by arranging a positive electrode, an insulating element and a negative electrode in layers.

[0154] For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0155] The electrode assembly 22 includes a main body 221 and tabs 222. The main body 221 is the primary component of the electrode assembly 22 used for electrochemical reactions to occur in the battery cell 20. For example, in... Figure 4 and Figure 5 In the middle, the electrode tab 222 is connected to one end of the main body 221 facing the wall 211 in the thickness direction X of the wall portion, that is, in the thickness direction X of the wall portion, the electrode tab 222 is located between the main body 221 and the wall portion 211 so that the electrode tab 222 can be connected to the electrode lead-out member 23.

[0156] It should be noted that the tabs 222 of the electrode assembly 22 are either formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer, or by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer. If the tab 222 is the positive tab of the electrode assembly 22, then the tab 222 is formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer; if the tab 222 is the negative tab of the electrode assembly 22, then the tab 222 is formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer.

[0157] Optionally, the electrode assembly 22 housed within the housing 21 can be one or more. For example, in... Figure 4In this embodiment, the outer casing 21 of the battery cell 20 is provided with only one electrode assembly 22. Of course, in other embodiments, multiple electrode assemblies 22 can also be provided inside the outer casing 21 of the battery cell 20. The multiple electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. For example, the number of electrode assemblies 22 contained in the outer casing 21 of the battery cell 20 can be two, three, four, five or six, etc.

[0158] Wherein, the thickness direction X of the wall is the height direction of the battery cell 20, the first direction Y is the length direction of the battery cell 20, and the second direction Z is the thickness direction of the battery cell 20. The thickness direction X, the first direction Y, and the second direction Z of the wall are perpendicular to each other.

[0159] In this embodiment, the electrode lead-out member 23 serves to electrically connect to the electrode assembly 22, acting as the output or input electrode of the battery cell 20, thereby enabling the output or input of electrical energy from the battery cell 20.

[0160] The electrode lead-out member 23 is insulated and mounted on the wall portion 211, meaning that no electrical connection is formed between the electrode lead-out member 23 and the wall portion 211 of the outer casing 21.

[0161] The electrode lead-out member 23 includes a first connecting portion 231, which is connected to the tab 222. That is, part of the electrode lead-out member 23 is a structure that passes through the wall portion 211, and the part of the electrode lead-out member 23 that connects to the tab 222 of the electrode assembly 22 is the first connecting portion 231. For example, the first connecting portion 231 of the electrode lead-out member 23 is disposed on the side of the wall portion 211 facing the electrode assembly 22.

[0162] See Figure 6 and Figure 7 As shown, an electrode lead-out hole 2111c is provided on the wall portion 211. The electrode lead-out hole 2111c penetrates the wall portion 211 along the thickness direction X. A portion of the electrode lead-out member 23 is inserted into the electrode lead-out hole 2111c, such that the electrode lead-out member 23 has a first connecting portion 231 located on the side of the wall portion 211 facing the electrode assembly 22. For example, the electrode lead-out hole 2111c is provided on the bottom surface of the first groove 2111b, that is, one end of the electrode lead-out hole 2111c in the thickness direction X of the wall portion penetrates the bottom surface of the first groove 2111b.

[0163] For example, the electrode lead 23 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0164] exist Figure 3 and Figure 4In the battery cell 20, there are two electrode leads 23. The two electrode leads 23 are spaced apart on the wall portion 211 along the first direction Y. Correspondingly, each electrode assembly 22 has two tabs 222. The two tabs 222 are connected to the end of the main body portion 221 facing the wall portion 211 in the thickness direction X of the wall portion. The two tabs 222 have opposite polarities and are spaced apart along the first direction Y. That is, the two tabs 222 are the positive tab and the negative tab of the electrode assembly 22, respectively. The two electrode leads 23 are electrically connected to the two tabs 222 of the electrode assembly 22, respectively, so as to realize the input or output of electrical energy of the battery cell 20.

[0165] In this embodiment, the first insulating member 24 is housed within the housing 21, and at least a portion of the first insulating member 24 is located between the wall portion 211 and the electrode assembly 22, so as to serve to insulate and isolate the wall portion 211 and the electrode assembly 22.

[0166] For example, the material of the first insulating element 24 can be various, such as rubber, plastic or silicone.

[0167] The first surface 2111a is the inner surface of the wall portion 211 facing the electrode assembly 22 in the thickness direction X of the wall portion.

[0168] The first surface 2111a is provided with a first groove 2111b, that is, the first groove 2111b is provided on the surface of the wall portion 211 facing the electrode assembly 22.

[0169] The second surface 241 is the surface of the first insulating member 24 facing the electrode assembly 22 in the thickness direction X of the wall portion, and correspondingly, the third surface 242 is the surface of the first insulating member 24 facing away from the electrode assembly 22 in the thickness direction X of the wall portion.

[0170] The second surface 241 is provided with a second groove 2411, and the third surface 242 is provided with a first protrusion 2421 corresponding to the position of the second groove 2411. That is, the surface of the first insulating member 24 facing the electrode assembly 22 is provided with a second groove 2411, and the surface of the first insulating member 24 away from the electrode assembly 22 is provided with a first protrusion 2421 corresponding to the position of the second groove 2411, so that the first insulating member 24 has a structure in which the second groove 2411 is formed on one side and the first protrusion 2421 is formed on the other side.

[0171] At least a portion of the first protrusion 2421 is accommodated within the first groove 2111b, that is, at least a portion of the first protrusion 2421 protruding from the third surface 242 of the first insulating member 24 is inserted into the first groove 2111b along the thickness direction X of the wall portion.

[0172] In some embodiments, the battery cell 20 may further include a pressure relief component for releasing the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0173] Optionally, the pressure relief component can be disposed on the end cap 213 of the outer casing 21 or on the housing 212 of the outer casing 21. Similarly, the pressure relief component and the outer casing 21 can be integrally formed or separately disposed. If the pressure relief component and the outer casing 21 are separately disposed, the pressure relief component can be connected to the outer casing 21 by welding or other means. Correspondingly, the pressure relief component can be a component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve or safety valve. If the pressure relief component and the outer casing 21 are integrally formed, the pressure relief component is an area on the outer casing 21 with a weak structure, such as an area on the outer casing 21 with a groove.

[0174] In this embodiment, a first groove 2111b is provided on the first surface 2111a of the wall portion 211 facing the electrode assembly 22, and a second groove 241 is provided on the second surface 241 of the first insulating member 24 facing away from the wall portion 211. A first protrusion 2421 is provided on the third surface 242 of the first insulating member 24 facing the wall portion 211 and corresponding to the position of the second groove 2411. By setting at least a portion of the first protrusion 2421 to be accommodated in the first groove 2111b, the insulation thickness of the portion of the first insulating member 24 located between the electrode assembly 22 and the wall portion 211 is satisfied, while also enabling the first insulating member 24 and the wall portion 211 to share a portion of the space in the thickness direction X of the wall portion. Furthermore, the space on the side of the first insulating member 24 facing the electrode assembly 22 can be expanded, thereby effectively increasing the internal space of the battery cell 20 for accommodating the electrode assembly 22. This is beneficial to improving the internal space utilization rate of the battery cell 20 and thus increasing the volumetric energy density of the battery cell 20.

[0175] According to some embodiments of this application, in conjunction with Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the electrode assembly 22 includes a main body 221 and a tab 222. The tab 222 is connected to one end of the main body 221 facing the wall 211 in the thickness direction X of the wall. The battery cell 20 may also include an electrode lead 23 disposed in the wall 211. The electrode lead 23 includes a first connecting portion 231, which is electrically connected to the tab 222. A portion of the first insulating member 24 is located between the first connecting portion 231 and the wall 211. At least a portion of the first connecting portion 231 and at least a portion of the tab 222 are accommodated in a second groove 2411 along the thickness direction X of the wall.

[0176] The first connecting part 231 is electrically connected to the electrode tab 222 to realize the electrical connection between the electrode assembly 22 and the electrode lead 23. Correspondingly, the first connecting part 231 and the electrode tab 222 can be directly connected, such as by welding or abutting. Of course, the first connecting part 231 and the electrode tab 222 can be indirectly connected through other components.

[0177] A portion of the first insulating member 24 is disposed between the wall portion 211 and the first connecting portion 231 to serve as an insulating barrier between the wall portion 211 and the first connecting portion 231. A portion of the first insulating member 24 is disposed between the wall portion 211 and the tab 222, so that the first insulating member 24 can also serve as an insulating barrier between the wall portion 211 and the tab 222.

[0178] Along the thickness direction X of the wall portion, at least a portion of the first connecting portion 231 and at least a portion of the tab 222 are both accommodated in the second groove 2411. That is, the first connecting portion 231 of the electrode lead-out member 23 and the electrode assembly 22 are both located on the side of the first insulating member 24 away from the wall portion 211, and at least a portion of the first connecting portion 231 is inserted into the second groove 2411 provided on the second surface 241 of the first insulating member 24 along the thickness direction X of the wall portion, and at least a portion of the tab 222 is inserted into the second groove 2411 provided on the second surface 241 of the first insulating member 24 along the thickness direction X of the wall portion.

[0179] It should be noted that, in combination Figure 4 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, in an embodiment where the battery cell 20 is provided with two electrode leads 23 and the electrode assembly 22 is provided with two tabs 222, the wall portion 211 is provided with two first grooves 2111b, and each first groove 2111b has an electrode lead hole 2111c correspondingly provided on its bottom surface. Each electrode lead 23 is correspondingly inserted into an electrode lead hole 2111c. The first insulating member 24 is provided with two second grooves 2411 and two first protrusions 2421. Each second groove 2411 is used to accommodate at least a portion of the first connecting portion 231 of an electrode lead 23 and at least a portion of a tab 222. At least a portion of each first protrusion 2421 is accommodated in a first groove 2111b along the thickness direction X of the wall portion.

[0180] In this embodiment, the tab 222 of the electrode assembly 22 is disposed at the end of the main body 221 facing the wall portion 211, and the first connecting portion 231 of the electrode lead 23 is connected to the tab 222 to realize the electrical connection between the electrode lead 23 and the electrode assembly 22, so that the electrical energy of the battery cell 20 can be input or output through the electrode lead 23. Specifically, by configuring at least a portion of the first connecting portion 231 and at least a portion of the tab 222 to be accommodated within the second groove 2411, the first insulating member 24 can achieve the effect of insulating and isolating the tab 222 and the wall portion 211, as well as the first connecting portion 231 and the wall portion 211, while also achieving the effect of the first insulating member 24 and the wall portion 211. The wall portion 211 shares a portion of space in the thickness direction X of the wall portion. While ensuring sufficient space between the first insulating member 24 and the main body portion 221 to accommodate the first connecting portion 231 and the electrode tab 222, it also enables the first insulating member 24 and the first connecting portion 231, as well as the first insulating member 24 and the electrode tab 222, to share a portion of space in the thickness direction X of the wall portion. This reduces the phenomenon of the first insulating member 24 pressing down on the electrode tab and satisfies the insulation and isolation effect between the electrode tab 222 and the wall portion 211. At the same time, it can further increase the space inside the battery cell 20 for accommodating the main body portion 221 of the electrode assembly 22, which is beneficial to further improve the volumetric energy density of the battery cell 20.

[0181] According to some embodiments of this application, see Figure 6 and Figure 9 As shown, a limiting part 243 is protruding from the bottom surface of the second groove 2411, and the limiting part 243 surrounds the outer periphery of the first connecting part 231.

[0182] In this embodiment, the limiting part 243 and the first insulating member 24 are integrally formed. Of course, in other embodiments, the limiting part 243 and the first insulating member 24 can also be separate structures. The limiting part 243 can be connected to the bottom surface of the second groove 2411 by bonding or snap-fitting. Exemplarily, in this embodiment, the first insulating member 24 is formed by injection molding.

[0183] The limiting part 243 surrounds the outer periphery of the first connecting part 231, that is, the limiting part 243 is a structure that surrounds the first connecting part 231. Optionally, the limiting part 243 can be a variety of structures. For example, the limiting part 243 can be an annular structure that surrounds the first connecting part 231 and is connected end to end. Of course, the limiting part 243 can also include multiple convex hull structures that are arranged at intervals along the circumference of the first connecting part 231, and the multiple convex hull structures surround the first connecting part 231.

[0184] In this embodiment, by providing a limiting part 243 protruding from the bottom surface of the second groove 2411, and the limiting part 243 being a structure surrounding the first connecting part 231, the limiting part 243 can play a certain limiting and positioning role for the first connecting part 231. On the one hand, it can reduce the shaking phenomenon of the first connecting part 231 during use, which is conducive to improving the stability of the first connecting part 231 in the second groove 2411. On the other hand, it can reduce the difficulty of assembling at least part of the first connecting part 231 into the second groove 2411, thereby reducing the assembly difficulty between the first insulating member 24 and the electrode lead-out member 23, which is conducive to improving the assembly efficiency of the battery cell 20.

[0185] According to some embodiments of this application, see Figure 9 As shown, the limiting part 243 is a ring structure that extends circumferentially along the first connecting part 231. In other words, the limiting part 243 is a ring structure that surrounds the first connecting part 231 and is connected end to end.

[0186] In this embodiment, by setting the limiting part 243 as an annular structure surrounding the first connecting part 231, the effect of the limiting part 243 in limiting and positioning the first connecting part 231 can be further improved, and the difficulty of protruding the limiting part 243 on the bottom surface of the second groove 2411 can be reduced.

[0187] In some embodiments, see Figure 6 and Figure 9 As shown, the limiting portion 243 is configured to divide the second groove 2411 into a first groove 2411a and a second groove 2411b. The first groove 2411a is located inside the limiting portion 243, and the second groove 2411b is located outside the limiting portion 243, and the second groove 2411b is disposed around the first groove 2411a. At least a portion of the first connecting portion 231 is accommodated in the first groove 2411a, and at least a portion of the electrode tab 222 is accommodated in the second groove 2411b.

[0188] The first groove 2411a is a groove structure formed by the bottom surface of the second groove 2411 and the inner peripheral surface of the limiting part 243. Correspondingly, the first groove 2411a is also the part located inside the limiting part 243 in the internal space of the second groove 2411. Similarly, the second groove 2411b is a groove structure formed by the bottom surface of the second groove 2411, the side surface of the second groove 2411, and the outer peripheral surface of the limiting part 243. Correspondingly, the second groove 2411b is also the part located outside the limiting part 243 in the internal space of the second groove 2411. Thus, the second groove 2411b is an annular groove structure surrounding the outside of the first groove 2411a.

[0189] It should be noted that the second groove 2411 of the first insulating member 24 is a structure provided on the second surface 241 of the first insulating member 24. If the limiting part 243 protrudes from the second surface 241 in the first direction Y, or the end face of the limiting part 243 away from the bottom surface of the groove of the second groove 2411 is flush with the second surface 241, then the groove depth of the first groove 2411a and the groove depth of the second groove 2411b are the same as the groove depth of the second groove 2411. If the limiting part 243 does not extend beyond the second surface 241 in the first direction Y and is spaced apart from the second surface 241, then the groove depth of the first groove 2411a and the groove depth of the second groove 2411b are both less than the groove depth of the second groove 2411.

[0190] At least a portion of the first connecting portion 231 is accommodated in the first groove 2411a, that is, at least a portion of the first connecting portion 231 is inserted into the second groove 2411 along the thickness direction X of the wall and is located on the inner peripheral side of the limiting portion 243.

[0191] At least a portion of the tab 222 is accommodated in the second groove 2411b, that is, at least a portion of the tab 222 is inserted into the second groove 2411 along the thickness direction X of the wall and is located on the outer periphery of the limiting portion 243.

[0192] In this embodiment, the limiting part 243 divides the second groove 2411 into a first groove 2411a located inside the limiting part 243 and a second groove 2411b located outside the limiting part 243, so that the second groove 2411b is a structure surrounding the outside of the first groove 2411a, and at least a portion of the first connecting part 231 and at least a portion of the tab 222 are respectively accommodated in the first groove 2411a and the second groove 2411b, so that the first groove 241a in the second groove 2411 is used to accommodate the first connecting part 231. 1a and the second groove 2411b for accommodating the tab 222 are independent structures. The battery cell 20 with this structure can reduce the interference between the first connecting part 231 and the tab 222. On the other hand, it can facilitate the assembly of at least a part of the first connecting part 231 and at least a part of the tab 222 into the second groove 2411. This helps to reduce the assembly difficulty between the electrode lead 23 and the first insulating part 24 and the electrode assembly 22 and the first insulating part 24, thereby improving the assembly efficiency of the battery cell 20.

[0193] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 6As shown, the tab 222 includes a connecting region 2221 and a bending region 2222. The connecting region 2221 is located on the side of the first connecting portion 231 opposite to the wall portion 211 in the thickness direction X of the wall portion and is connected to the first connecting portion 231. The bending region 2222 connects the connecting region 2221 and the main body portion 221. At least a portion of the bending region 2222 is accommodated in the second groove 2411 along the thickness direction X of the wall portion.

[0194] The connecting area 2221 is the region of the tab 222 located on the side of the first connecting portion 231 away from the wall portion 211 in the thickness direction X of the wall portion and connected to the first connecting portion 231. The bending area 2222 is the bending structure of the tab 222 connecting the connecting area 2221 and the main body portion 221 of the electrode assembly 22.

[0195] For example, the connecting area 2221 and the first connecting portion 231 are stacked and welded together along the thickness direction X of the wall. Of course, in other embodiments, the connection structure between the connecting area 2221 and the first connecting portion 231 can also be abutment or snap-fit, etc.

[0196] At least a portion of the bending area 2222 is accommodated in the second groove 2411 along the thickness direction X of the wall portion. That is, the area of ​​the tab 222 bent to form the bending area 2222 is inserted into the second groove 2411 along the thickness direction X of the wall portion. It should be noted that in the embodiment where the first insulating member 24 is provided with a limiting part 243 and the limiting part 243 divides the second groove 2411 into a first groove 2411a and a second groove 2411b, at least a portion of the bending area 2222 of the tab 222 is inserted into the second groove 2411 along the thickness direction X of the wall portion and is located in the second groove 2411b.

[0197] In this embodiment, the tab 222 has a connection area 2221 located on the side of the first connecting portion 231 away from the wall portion 211 in the thickness direction X of the wall portion and connected to the first connecting portion 231. The tab 222 also has a bending area 2222 connecting the connection area 2221 and the main body portion 221 to realize the electrical connection between the electrode assembly 22 and the electrode lead 23. By setting at least a portion of the bending area 2222 of the tab 222 to be accommodated in the second groove 2411 along the thickness direction X of the wall portion, the connection between the tab 222 and the first insulating member 24 in the thickness direction of the wall portion is realized. While sharing a portion of the space, X also allows for sufficient space between the first insulating member 24 and the main body 221 to accommodate the bending area 2222. This facilitates bending the tab 222 to connect the connection area 2221 of the tab 222 with the first connecting part 231, reducing the difficulty of bending the tab 222 and the assembly difficulty between the tab 222 and the first connecting part 231. On the other hand, it alleviates the phenomenon of the first insulating member 24 pressing down on the bending area 2222 of the tab 222, thus reducing the risk of damage to the bending area 2222 of the tab 222.

[0198] In some embodiments, see Figure 6 As shown, the bending area 2222 is bent to form multiple bending segments 2222a, which are connected in sequence. The bending segments 2222a at both ends of the multiple bending segments 2222a are connected to the connecting area 2221 and the main body 221, respectively.

[0199] The bending area 2222 is bent into multiple bending segments 2222a, which are connected in sequence. In other words, the bending area 2222 is a structure of bending in a local area, so that the bending area 2222 forms multiple bending segments 2222a connected in sequence, and each pair of adjacent bending segments 2222a is set at an acute angle, a right angle or an obtuse angle.

[0200] For example, in Figure 6 In the bending region 2222, four bending segments 2222a are formed by bending in sequence. The two bending segments 2222a at both ends of the four bending segments 2222a are connected to the connecting region 2221 and the main body 221, respectively. Of course, in other embodiments, the number of bending segments 2222a formed by bending in the bending region 2222 can also be two, three, five or six, etc.

[0201] In this embodiment, the bending area 2222 of the tab 222 is configured to be bent to form a plurality of sequentially connected bending segments 2222a, and the bending segments 2222a at both ends of the plurality of bending segments 2222a are respectively connected to the connecting area 2221 and the main body 221 to realize the bending structure of the tab 222. The battery cell 20 with this structure can reduce the difficulty of forming the bending area 2222 of the tab 222, so as to realize that the tab 222 has a connecting area 2221 on the side of the first connecting part 231 away from the wall part 211 in the thickness direction X of the wall part. On the other hand, the bending area 2222 can play a certain buffering role between the connecting area 2221 and the main body 221, which helps to reduce the phenomenon of rigid tension between the connecting area 2221 and the main body 221.

[0202] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 6 As shown, the battery cell 20 includes two electrode leads 23, which are spaced apart on the wall portion 211 along a first direction Y. The electrode assembly 22 includes two tabs 222 with opposite polarities. Both tabs 222 are connected to one end of the main body portion 221 facing the wall portion 211 in the thickness direction X of the wall portion, and the two tabs 222 are spaced apart along the first direction Y. Each tab 222 is connected to a first connecting portion 231 of an electrode lead 23. The bending region 2222 and the first connecting portion 231 are arranged along a second direction Z. The thickness direction X of the wall portion, the first direction Y, and the second direction Z are perpendicular to each other.

[0203] The electrode assembly 22 is provided with two tabs 222 of opposite polarity, namely a positive tab and a negative tab. Correspondingly, each tab 222 is connected to the first connection part 231 of an electrode lead 23 to realize the input or output of electrical energy of the battery cell 20.

[0204] For example, in this embodiment of the application, the battery cell 20 is cuboid, and correspondingly, the wall portion 211 is rectangular. The length direction of the wall portion 211 is the first direction Y, and the width direction of the wall portion 211 is the second direction Z. Correspondingly, the two electrode leads 23 and the two tabs 222 are both structures that are spaced apart along the length direction of the wall portion 211. The bending area 2222 of the tab 222 and the first connecting portion 231 of the corresponding electrode lead 23 are arranged along the width direction of the wall portion 211. That is, the bending area 2222 of the tab 222 is located on one side of the first connecting portion 231 of the corresponding electrode lead 23 in the second direction Z.

[0205] In this embodiment, the battery cell 20 is further provided with two electrode leads 23 arranged at intervals along the first direction Y, and the electrode assembly 22 is correspondingly provided with two tabs 222 arranged at intervals along the first direction Y. The two tabs 222 are respectively connected to the two electrode leads 23 to realize the input or output of electrical energy of the battery cell 20. In this embodiment, by setting the bending area 2222 of the tab 222 and the first connecting part 231 of the electrode lead 23 to be arranged along the second direction Z, the arrangement direction of the bending area 2222 and the first connecting part 231 is perpendicular to the arrangement direction of the two tabs 222. This facilitates the bending of the tabs 222 to form the bending section 2222a and reduces the assembly difficulty between the tabs 222 and the first connecting part 231. On the other hand, it optimizes the internal space arrangement of the battery cell 20, which is beneficial to improve the internal space utilization of the battery cell 20 and reduces the interference between the bending areas 2222 of the two tabs 222.

[0206] According to some embodiments of this application, refer to Figure 6 , Figure 7 , Figure 8 and Figure 9 Please refer to further details. Figure 10 and Figure 11 , Figure 10 A cross-sectional view of the wall portion 211 of the housing 21 provided in some embodiments of this application, perpendicular to the first direction Y. Figure 11 This is an exploded view of the structure of the electrode lead-out member 23 of the battery cell 20 provided in some embodiments of this application. The bottom surface of the first groove 2111b is provided with an electrode lead-out hole 2111c. The electrode lead-out member 23 may further include a lead-out portion 232 and a second connecting portion 233. Along the thickness direction X of the wall portion, the lead-out portion 232 is located on the side of the wall portion 211 away from the electrode assembly 22. The second connecting portion 233 passes through the electrode lead-out hole 2111c and connects the lead-out portion 232 and the first connecting portion 231. The bottom surface of the second groove 2411 is provided with a through hole 244. Along the thickness direction X of the wall portion, the through hole 244 is correspondingly provided with the electrode lead-out hole 2111c, and the second connecting portion 233 passes through the through hole 244.

[0207] Among them, the bottom surface of the first groove 2111b is provided with an electrode lead-out hole 2111c, that is, the electrode lead-out hole 2111c provided on the wall 211 has a structure that penetrates the bottom surface of the first groove 2111b along the thickness direction X of the wall.

[0208] Along the thickness direction X of the wall portion, the lead-out portion 232 is located on the side of the wall portion 211 opposite to the electrode assembly 22. That is, the lead-out portion 232 and the first connecting portion 231 of the electrode lead-out member 23 are respectively located on both sides of the wall portion 211. This results in the electrode lead-out member 23 having a first connecting portion 231 located inside the outer casing 21 and connected to the tab 222 of the electrode assembly 22, and the electrode lead-out member 23 having a lead-out portion 232 located outside the outer casing 21 and electrically connected to other components, so as to realize the input or output of electrical energy of the battery cell 20. Correspondingly, the second connecting portion 233 is a component in which the electrode lead-out member 23 is inserted into the electrode lead-out hole 2111c along the thickness direction X of the wall portion and connects the lead-out portion 232 and the first connecting portion 231.

[0209] The bottom surface of the second groove 2411 is provided with a through hole 244, that is, the through hole 244 provided on the first insulating member 24 is a structure that penetrates the bottom surface of the second groove 2411 along the thickness direction X of the wall portion, and the through hole 244 penetrates the surface of the first protrusion 2421 away from the electrode assembly 22 along the thickness direction X of the wall portion.

[0210] Along the thickness direction X of the wall portion, the through hole 244 and the electrode lead-out hole 2111c are correspondingly provided. That is, in the projection plane perpendicular to the thickness direction X of the wall portion, the area defined by the orthographic projection of the hole wall surface of the through hole 244 and the area defined by the orthographic projection of the hole wall surface of the electrode lead-out hole 2111c overlap by at least a portion, thereby facilitating the second connecting portion 233 of the electrode lead-out member 23 to pass through the electrode lead-out hole 2111c and the through hole 244 sequentially along the thickness direction X of the wall portion.

[0211] It should be noted that in the embodiment where the end cap 213 is a wall portion 211, the wall portion 211 includes a body portion 2111 and an edge portion 2112, and the body portion 2111 has a first surface 2111a, the electrode lead-out hole 2111c is provided on the body portion 2111.

[0212] It should be noted that in an embodiment where a limiting part 243 is provided on the bottom surface of the second groove 2411 of the first insulating member 24, and the limiting part 243 is configured to divide the second groove 2411 into a first groove 2411a located inside the limiting part 243 and a second groove 2411b located outside the limiting part 243, the through hole 244 is connected to the first groove 2411a. Correspondingly, the projection of the hole wall surface of the through hole 244 in the thickness direction X of the wall is located in the first groove 2411a.

[0213] In this embodiment, by providing an electrode lead-out hole 2111c on the bottom surface of the first groove 2111b of the wall portion 211, and providing a through hole 244 corresponding to the electrode lead-out hole 2111c on the bottom surface of the second groove 2411 of the first insulating member 24, the second connecting portion 233 of the electrode lead-out member 23 can pass through the electrode lead-out hole 2111c and the through hole 244 in sequence along the thickness direction X of the wall portion and connect to the lead-out portion 232 and the first connecting portion 231 located on both sides of the wall portion 211. This enables the electrode lead-out member 23 to be electrically connected to the electrode assembly 22 and to input or output the electrical energy of the battery cell 20 through the electrode lead-out member 23. The structure is simple and can reduce the assembly difficulty of the first insulating member 24 and the assembly difficulty between the electrode lead-out member 23 and the tab 222, which is beneficial to improving the assembly efficiency of the battery cell 20.

[0214] According to some embodiments of this application, see Figure 5 , Figure 6 and Figure 11 As shown, the second connecting part 233 is riveted to the lead-out part 232.

[0215] For example, the lead-out portion 232 is provided with a riveting hole 2321, which penetrates the surfaces of both sides of the lead-out portion 232 along the thickness direction X of the wall portion. Correspondingly, the second connecting portion 233 is inserted into the riveting hole 2321 and riveted to the lead-out portion 232.

[0216] It should be noted that in other embodiments, the lead-out portion 232 and the second connecting portion 233 may also be connected to each other by welding or snap-fitting structures.

[0217] In this embodiment, by setting the second connecting part 233 and the lead-out part 232 as a riveted structure, it is beneficial to improve the connection stability between the second connecting part 233 and the lead-out part 232, thereby reducing the risk of connection failure of the electrode lead-out part 23 during use, and also reducing the connection difficulty between the second connecting part 233 and the lead-out part 232, thereby improving the assembly efficiency of the battery cell 20.

[0218] According to some embodiments of this application, see Figure 5 , Figure 6 and Figure 11 As shown, the first connecting portion 231 and the second connecting portion 233 are integrally formed. That is, the first connecting portion 231 and the second connecting portion 233 of the electrode lead-out member 23 are structures manufactured by an integral forming process, such as casting, stamping or milling.

[0219] In this embodiment, by setting the first connecting part 231 and the second connecting part 233 as an integrally formed structure, on the one hand, the connection stability between the first connecting part 231 and the second connecting part 233 can be improved, thereby reducing the risk of connection failure of the electrode lead 23 during use. On the other hand, the assembly and connection process of the first connecting part 231 and the second connecting part 233 can be reduced during the assembly process of the battery cell 20, which is conducive to optimizing the production cycle of the battery cell 20 and improving the assembly efficiency of the battery cell 20.

[0220] In some embodiments, please continue to see Figure 5 , Figure 6 and Figure 11 As shown, along the thickness direction X of the wall portion, the second connecting portion 233 protrudes from the surface of the first connecting portion 231 facing the wall portion 211. That is, the second connecting portion 233 and the first connecting portion 231 are arranged along the thickness direction X of the wall portion, and the end of the second connecting portion 233 near the first connecting portion 231 is connected to the surface of the first connecting portion 231 facing the wall portion 211.

[0221] For example, in the projection plane perpendicular to the thickness direction X of the wall, the orthographic projection of the second connecting portion 233 is located within the orthographic projection of the first connecting portion 231.

[0222] In this embodiment, by setting the second connecting part 233 as a structure that protrudes from the surface of the first connecting part 231 facing the wall part 211, on the one hand, the assembly difficulty of the second connecting part 233 passing through the through hole 244 and the electrode lead-out hole 2111c can be reduced, thereby reducing the assembly difficulty of the battery cell 20. On the other hand, the space occupied by the first connecting part 231 and the second connecting part 233 in the direction perpendicular to the thickness direction X of the wall part can be saved, which is beneficial to optimizing the internal space layout of the battery cell 20.

[0223] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures, such as the first connecting part 231 and the second connecting part 233 being separately arranged. That is, the first connecting part 231 and the second connecting part 233 of the electrode lead-out member 23 are two independent components, and the first connecting part 231 and the second connecting part 233 are connected to each other. For example, the first connecting part 231 can be an adapter piece or a current collector component disposed between the second connecting part 233 and the tab 222.

[0224] In this embodiment, by setting the first connecting part 231 and the second connecting part 233 as separate structures, it is beneficial to improve the assembly flexibility of the electrode lead 23, so that the positions of the first connecting part 231 and the second connecting part 233 can be adjusted according to the actual assembly situation to meet the assembly application scenarios of different battery cells 20.

[0225] In an embodiment where the first connecting part 231 and the second connecting part 233 are separately provided, the first connecting part 231 and the second connecting part 233 are welded together.

[0226] Of course, in other embodiments, the first connecting part 231 and the second connecting part 233 may also be abutting or snapping with each other.

[0227] In this embodiment, by setting the first connecting part 231 and the second connecting part 233 to be welded together, the connection stability between the first connecting part 231 and the second connecting part 233 can be improved, thereby reducing the risk of connection failure of the electrode lead 23 during use.

[0228] According to some embodiments of this application, see Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the battery cell 20 may also include a second insulating member 25, at least a portion of which is disposed between the wall portion 211 and the lead-out portion 232.

[0229] The second insulating member 25 serves as both the insulating isolation wall 211 and the lead-out portion 232 of the electrode lead-out member 23. The material of the second insulating member 25 can be various, such as silicone, rubber, or plastic.

[0230] At least a portion of the second insulating member 25 is disposed between the wall portion 211 and the lead-out portion 232. That is, the second insulating member 25 can be a structure in which the entire portion is located between the wall portion 211 and the lead-out portion 232, or it can be a structure in which only a portion is located between the wall portion 211 and the lead-out portion 232. For example, in Figure 5 and Figure 6 In this case, only a portion of the second insulating member 25 is located between the wall portion 211 and the lead-out portion 232.

[0231] In this embodiment, the battery cell 20 is further provided with a second insulating member 25, and at least a portion of the second insulating member 25 is disposed between the wall portion 211 and the lead portion 232, so that the second insulating member 25 can achieve insulation isolation between the wall portion 211 and the lead portion 232 of the electrode lead 23, thereby reducing the risk of short circuit between the wall portion 211 and the lead portion 232 during use, which is beneficial to improving the reliability of the battery cell 20.

[0232] According to some embodiments of this application, see Figure 4 , Figure 5 , Figure 6 and Figure 10 As shown, the wall portion 211 has a fourth surface 2111d facing away from the electrode assembly 22 in the thickness direction X of the wall portion. The fourth surface 2111d is provided with a mounting groove 2111f. The mounting groove 2111f and the first groove 2111b are correspondingly provided along the thickness direction X of the wall portion, and the electrode lead-out hole 2111c communicates with the mounting groove 2111f and the first groove 2111b. At least a portion of the second insulating member 25 is accommodated in the mounting groove 2111f along the thickness direction X of the wall portion.

[0233] Among them, the fourth surface 2111d is the outer surface of the wall portion 211 that is away from the electrode assembly 22 in the thickness direction X of the wall portion, and correspondingly, the mounting groove 2111f is provided on the surface of the wall portion 211 that is away from the electrode assembly 22.

[0234] The assembly groove 2111f and the first groove 2111b are respectively arranged along the thickness direction X of the wall. That is, in the projection plane perpendicular to the thickness direction X of the wall, at least part of the orthographic projection of the bottom surface of the assembly groove 2111f and the orthographic projection of the bottom surface of the first groove 2111b overlap.

[0235] The electrode lead-out hole 2111c connects the assembly groove 2111f and the first groove 2111b. That is, the electrode lead-out hole 2111c has a structure in which both ends of the wall in the thickness direction X penetrate the bottom surface of the assembly groove 2111f and the bottom surface of the first groove 2111b, respectively.

[0236] Along the thickness direction X of the wall portion, at least a portion of the second insulating member 25 is accommodated within the mounting groove 2111f. That is, the second insulating member 25 can be a structure entirely accommodated within the mounting groove 2111f, or a structure only partially accommodated within the mounting groove 2111f. For example, in... Figure 6 In this process, only a portion of the second insulating element 25 is accommodated within the assembly groove 2111f.

[0237] In this embodiment, by providing an assembly groove 2111f on the fourth surface 2111d of the wall portion 211, and at least a portion of the second insulating member 25 being accommodated in the assembly groove 2111f along the thickness direction X of the wall portion, the battery cell 20 with this structure can, on the one hand, limit and position the second insulating member 25 through the assembly groove 2111f, which helps to reduce the difficulty of assembling the second insulating member 25 between the wall portion 211 and the lead-out portion 232, and can reduce the phenomenon of shaking or displacement of the second insulating member 25 during use, which helps to improve the assembly stability of the second insulating member 25. On the other hand, it can realize that the second insulating member 25 and the wall portion 211 share a part of the space in the thickness direction X of the wall portion, which helps to optimize the volume of the battery cell 20.

[0238] According to some embodiments of this application, see Figure 10 As shown, along the thickness direction X of the wall, the minimum distance between the bottom surface of the mounting groove 2111f and the bottom surface of the first groove 2111b is L2, which satisfies 0.5mm≤L2≤3mm.

[0239] The minimum distance between the bottom surface of the assembly groove 2111f and the bottom surface of the first groove 2111b is L2. That is, the wall thickness of the portion of the wall 211 located between the bottom surface of the assembly groove 2111f and the bottom surface of the first groove 2111b in the thickness direction X of the wall is L2.

[0240] For example, the minimum distance L2 between the bottom surface of the mounting groove 2111f and the bottom surface of the first groove 2111b can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, etc.

[0241] In this embodiment, by setting the minimum distance between the bottom surface of the assembly groove 2111f and the bottom surface of the first groove 2111b to 0.5mm to 3mm, the minimum distance in the thickness direction X of the portion of the wall portion 211 located between the bottom surface of the assembly groove 2111f and the bottom surface of the first groove 2111b is 0.5mm to 3mm. This improves the structural strength of the portion of the wall portion 211 located between the bottom surface of the assembly groove 2111f and the bottom surface of the first groove 2111b, and helps to alleviate the structural stress of the wall portion 211 used for... Deformation or cracking occurs in the area where the electrode lead-out member 23 is assembled, which improves the reliability of the battery cell 20. On the other hand, it can save the space occupied by the portion of the wall portion 211 located between the bottom surface of the assembly groove 2111f and the bottom surface of the first groove 2111b in the thickness direction X of the wall portion. This optimizes the length of the second connecting portion 233 of the electrode lead-out member 23 in the thickness direction X of the wall portion, so that the second connecting portion 233 can be inserted into the electrode lead-out hole 2111c, and the manufacturing cost of the second connecting portion 233 can be reduced.

[0242] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 6 As shown, the battery cell 20 may also include a seal 26, which is disposed between the second connection portion 233 and the wall portion 211. The seal 26 is configured to seal the gap between the second connection portion 233 and the wall surface of the electrode lead-out hole 2111c.

[0243] The sealing element 26 serves to seal the gap between the second connecting part 233 and the hole wall of the electrode lead-out hole 2111c. The sealing element 26 can be made of various materials, such as rubber, plastic or silicone.

[0244] For example, in Figure 6 In this process, the sealing member 26 is sleeved on the outside of the second connecting part 233, and a portion of the sealing member 26 is located inside the electrode lead-out hole 2111c, such that a portion of the sealing member 26 is located between the second connecting part 233 and the hole wall surface of the electrode lead-out hole 2111c.

[0245] In this embodiment, the battery cell 20 is also provided with a sealing member 26. By placing the sealing member 26 between the wall portion 211 and the second connecting portion 233 of the electrode lead 23, the sealing member 26 can seal the gap between the second connecting portion 233 of the electrode lead 23 and the hole wall surface of the electrode lead hole 2111c, thereby reducing the risk of leakage of the battery cell 20 at the electrode lead hole 2111c, which is beneficial to improving the stability and reliability of the battery cell 20.

[0246] According to some embodiments of this application, please refer to Figure 6, Figure 7 and Figure 10 As shown, the wall portion 211 has a fourth surface 2111d that is opposite to the electrode assembly 22 in the thickness direction X of the wall portion. The distance between the fourth surface 2111d and the first surface 2111a along the thickness direction X of the wall portion is D, and the groove depth of the first groove 2111b is H, which satisfies 0.05≤H / D≤0.875.

[0247] Among them, the fourth surface 2111d is the outer surface of the wall portion 211 that is away from the electrode assembly 22 in the thickness direction X of the wall portion.

[0248] Along the thickness direction X of the wall portion, the distance between the fourth surface 2111d and the first surface 2111a is D. That is, the wall thickness of the area of ​​the wall portion 211 used to provide the first groove 2111b is D. In the embodiment where the wall portion 211 includes the body portion 2111 and the edge portion 2112, D is the wall thickness of the body portion 2111.

[0249] 0.05≤H / D≤0.875, that is, the groove depth of the first groove 2111b provided on the first surface 2111a is 0.05 to 0.875 of the wall thickness of the body portion 2111 of the wall portion 211.

[0250] For example, H / D can be 0.05, 0.06, 0.08, 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.35, 0.38, 0.4, 0.42, 0.45, 0.48, 0.5, 0.52, 0.55, 0.58, 0.6, 0.62, 0.65, 0.68, 0.7, 0.72, 0.75, 0.78, 0.8, 0.81, 0.82, 0.85, 0.86, 0.87, or 0.875, etc.

[0251] In this embodiment, by setting the ratio of the groove depth of the first groove 2111b to the distance between the first surface 2111a and the fourth surface 2111d to 0.05 to 0.875, the groove depth of the first groove 2111b is 0.05 to 0.875 of the wall thickness of the area where the first groove 2111b is located. On the one hand, this can improve the effect of the first groove 2111b in accommodating the first protrusion 2421 of the first insulating member 24, which is conducive to increasing the shared space of the wall 211 and the first insulating member 24 in the thickness direction X of the wall, thereby improving the internal space utilization of the battery cell 20. On the other hand, it can alleviate the phenomenon of weak structural strength in the area where the first groove 2111b is located in the wall 211, which is conducive to improving the structural strength of the area where the first groove 2111b is located in the wall 211, thereby reducing the risk of deformation or cracking of the wall 211 during use.

[0252] In some embodiments, see Figure 10 As shown, 1mm≤D≤4mm. That is to say, the wall thickness of the main body 2111 of the wall portion 211 in the thickness direction X of the wall portion is 1mm to 4mm.

[0253] For example, D can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, or 4mm, etc.

[0254] In this embodiment, by setting the distance between the first surface 2111a and the fourth surface 2111d to 1mm to 4mm, the wall thickness of the area of ​​the wall portion 211 used to set the first groove 2111b is 1mm to 4mm. On the one hand, this can improve the structural strength of the wall portion 211, thereby reducing the risk of deformation or cracking of the wall portion 211 during use, and also reduce the difficulty of opening the first groove 2111b on the first surface 2111a of the wall portion 211. On the other hand, it can save the space occupied by the wall portion 211 and reduce the weight of the wall portion 211, which is beneficial to improving the energy density of the battery cell 20.

[0255] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 5 As shown, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity with an opening 2121, in which the electrode assembly 22 is housed. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0256] The end cap 213 is a wall portion 211, that is, the electrode lead-out member 23 is disposed on the end cap 213 of the outer shell 21. Correspondingly, the first groove 2111b is disposed on the surface of the end cap 213 facing the electrode assembly 22, and the first insulating member 24 is disposed between the end cap 213 and the first connecting portion 231.

[0257] In this embodiment, by setting the wall portion 211 of the outer casing 21 as an end cap 213 for closing the opening 2121 of the casing 212, the battery cell 20 with this structure is convenient to assemble the electrode lead 23 on the wall portion 211, and can reduce the assembly difficulty between the tab 222 and the first connection portion 231 of the electrode lead 23, thereby reducing the manufacturing difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0258] According to some embodiments of this application, see Figure 6 ,Figure 7 and Figure 10 As shown, at least a portion of the wall portion 211 is inserted into the receiving cavity through the opening 2121. The wall portion 211 has a first outer peripheral surface 2111e that abuts against the inner peripheral surface of the housing 212, and the wall portion 211 is welded to the housing 212. The minimum distance between the groove side surface of the first groove 2111b and the first outer peripheral surface 2111e is L1, which satisfies 1mm≤L1≤5mm.

[0259] Wherein, the first outer peripheral surface 2111e is the surface on which the portion of the wall portion 211 inserted into the receiving cavity of the housing 212 abuts against the inner peripheral surface of the housing 212.

[0260] The minimum distance between the side surface of the first groove 2111b and the first outer peripheral surface 2111e is L1, that is, the minimum distance between the surface of the part of the wall 211 inserted into the receiving cavity of the housing 212 and the inner peripheral surface of the housing 212 and the side surface of the first groove 2111b in the direction perpendicular to the thickness direction X of the wall is L1.

[0261] It should be noted that in the embodiment where the end cap 213 is a wall portion 211, the wall portion 211 includes a body portion 2111 and an edge portion 2112, and the body portion 2111 is inserted into the receiving cavity, the outer peripheral surface of the body portion 2111 is the first outer peripheral surface 2111e. Correspondingly, L1 is the minimum distance between the outer peripheral surface of the body portion 2111 and the groove side surface of the first groove 2111b in the direction perpendicular to the thickness direction X of the wall portion.

[0262] For example, the minimum distance L1 between the groove side surface of the first groove 2111b and the first outer peripheral surface 2111e can be 1mm, 1.1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 4.9mm, or 5mm, etc.

[0263] In this embodiment, at least a portion of the wall portion 211 is inserted into the receiving cavity, and the wall portion 211 and the housing 212 are welded together to achieve the closure of the opening 2121 by the wall portion 211. By setting the minimum distance between the groove side surface of the first groove 2111b and the first outer peripheral surface 2111e of the wall portion 211 to 1mm to 5mm, the thickness of the portion of the wall portion 211 located between the groove side surface of the first groove 2111b and the first outer peripheral surface 2111e can be increased, thereby reducing the influence of the first groove 2111b on the welding position of the wall portion 211 and the housing 212. This can effectively increase the welding penetration between the wall portion 211 and the shell 212, which is beneficial to improving the welding stability and welding quality between the wall portion 211 and the shell 212. On the other hand, it can alleviate the phenomenon that the minimum distance between the groove side of the first groove 2111b and the first outer peripheral surface 2111e of the wall portion 211 is too large, which restricts the area where the first groove 2111b is set in the wall portion 2111. This can reduce the difficulty of setting the first groove 2111b on the first surface 2111a of the wall portion 211, and reduce the difficulty of assembling the first protrusion 2421 into the first groove 2111b.

[0264] In some embodiments, see Figure 10 As shown, 1.5mm≤L1≤4mm.

[0265] In this embodiment, by further setting the minimum distance between the groove side surface of the first groove 2111b and the first outer peripheral surface 2111e of the wall portion 211 to 1.5mm to 4mm, on the one hand, the thickness of the portion of the wall portion 211 located between the groove side surface of the first groove 2111b and the first outer peripheral surface 2111e can be further increased, thereby further reducing the influence of the first groove 2111b on the welding position of the wall portion 211 and the shell 212, thereby further improving the welding penetration between the wall portion 211 and the shell 212, which is beneficial to further improving the welding stability and welding quality between the wall portion 211 and the shell 212. On the other hand, it can further alleviate the phenomenon of limited area for setting the first groove 2111b in the wall portion 211, thereby further reducing the difficulty of setting the first groove 2111b on the first surface 2111a of the wall portion 211, and further reducing the difficulty of assembling the first protrusion 2421 into the first groove 2111b.

[0266] According to some embodiments of this application, see Figure 6 , Figure 7 and Figure 10As shown, the wall portion 211 may include a body portion 2111 and an edge portion 2112. Along the thickness direction X of the wall portion, a portion of the body portion 2111 is inserted into the receiving cavity through the opening 2121. The body portion 2111 has a first outer peripheral surface 2111e and a first surface 2111a. The edge portion 2112 protrudes from the first outer peripheral surface 2111e and abuts against the end of the housing 212 where the opening 2121 is located along the thickness direction X of the wall portion.

[0267] The body portion 2111 has a first outer peripheral surface 2111e, that is, the body portion 2111 is the part of the wall portion 211 inserted into the receiving cavity, and the outer peripheral surface of the body portion 2111 is the surface on which the wall portion 211 and the inner peripheral surface of the housing 212 abut against each other.

[0268] The body portion 2111 has a first surface 2111a, that is, the inner surface of the body portion 2111 facing the electrode assembly 22 in the thickness direction X of the wall portion is the first surface 2111a of the wall portion 2111. Similarly, the outer surface of the body portion 2111 facing away from the electrode assembly 22 in the thickness direction X of the wall portion is the fourth surface 2111d of the wall portion 2111.

[0269] It should be noted that the first outer peripheral surface 2111e and the first surface 2111a can be directly connected or indirectly connected. For example, in Figure 10 In the middle, the first outer peripheral surface 2111e and the first surface 2111a are connected by a chamfered surface.

[0270] The edge portion 2112 protrudes from the first outer peripheral surface 2111e, that is, the edge portion 2112 is a structure that is connected to the first outer peripheral surface 2111e of the body portion 2111 and protrudes from the first outer peripheral surface 2111e.

[0271] The edge portion 2112 abuts against the end of the housing 212 where the opening 2121 is provided along the thickness direction X of the wall portion. That is, in the thickness direction X of the wall portion, the end face of the end of the housing 212 where the opening 2121 is provided abuts against the edge portion 2112.

[0272] For example, in Figure 10 In the middle, along the thickness direction X of the wall portion, the wall portion 211 has a fourth surface 2111d that is away from the electrode assembly 22, and the surface of the edge portion 2112 on the side away from the housing 212 is coplanar with the fourth surface 2111d.

[0273] In this embodiment, the wall portion 211 is provided with a body portion 2111 and an edge portion 2112. The body portion 2111 has a first outer peripheral surface 2111e that abuts against the inner peripheral surface of the housing 212 and a first surface 2111a for providing a first groove 2111b. By setting the edge portion 2112 of the wall portion 211 to be protruding on the first outer peripheral surface 2111e and abutting against the end of the housing 212 with an opening 2121 along the thickness direction X of the wall portion, the body portion 2111 of the wall portion 211 can close the opening 2121 and provide the first groove 2111b, while the edge portion 2112 can also play a certain limiting and positioning role for the body portion 2111. This helps to reduce the assembly difficulty between the wall portion 211 and the housing 212 and improves the assembly quality between the wall portion 211 and the housing 212.

[0274] In some embodiments, see Figure 7 and Figure 10 As shown, the edge portion 2112 is a ring-shaped structure surrounding the body portion 2111. That is, the edge portion 2112 is a ring-shaped structure that extends circumferentially along the body portion 2111 and is connected end to end.

[0275] It should be noted that in other embodiments, the edge portion 2112 may also be other structures. For example, the edge portion 2112 may be a plurality of convex structures protruding from the first outer peripheral surface 2111e, and the plurality of convex structures are arranged at intervals along the circumferential direction of the body portion 2111.

[0276] In this embodiment, by setting the edge portion 2112 as an annular structure surrounding the outer side of the body portion 2111, the effect of the edge portion 2112 in limiting and positioning the body portion 2111 can be further improved. On the one hand, it can further reduce the assembly difficulty between the wall portion 211 and the housing 212, and further improve the assembly quality between the wall portion 211 and the housing 212. On the other hand, it can also improve the sealing effect of the wall portion 211 on the opening 2121 of the housing 212, so as to reduce the risk of leakage of the battery cell 20 during use.

[0277] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the outer casing 21 can include a housing 212 and an end cap 213. The housing 212 includes an integrally formed side wall 2123 and a bottom wall 2122. The side wall 2123 surrounds the bottom wall 2122. Along the thickness direction X of the wall, one end of the side wall 2123 is connected to the bottom wall 2122, and the other end forms an opening 2121. The side wall 2123 and the bottom wall 2122 together define a receiving cavity. The electrode assembly 22 is received in the receiving cavity. The end cap 213 closes the opening 2121, and the bottom wall 2122 is a wall 211.

[0278] The shell 212 includes an integrally formed side wall 2123 and bottom wall 2122, that is, the side wall 2123 and bottom wall 2122 of the shell 212 are structures made by an integral forming process, such as stamping or casting.

[0279] The bottom wall 2122 is a wall portion 211, that is, the electrode lead-out member 23 is disposed on the bottom wall 2122 of the housing 212. Correspondingly, the first groove 2111b is disposed on the surface of the bottom wall 2122 of the housing 212 facing the electrode assembly 22, and the first insulating member 24 is disposed between the bottom wall 2122 of the housing 212 and the first connecting portion 231.

[0280] In this embodiment, by setting the wall portion 211 of the outer casing 21 as the bottom wall 2122 opposite to the end cap 213, the wall portion 211 where the electrode lead 23 is provided can be moved away from the end cap 213. This can alleviate the phenomenon that the stress generated by the pulling or twisting of the electrode lead 23 by other components is transmitted to the connection position of the end cap 213 and the outer casing 212, thereby reducing the risk of connection failure of the end cap 213 and the outer casing 212 during use, and improving the stability and reliability of the battery cell 20.

[0281] According to some embodiments of this application, see Figure 5 , Figure 8 and Figure 9 As shown, the electrode assembly 22 includes a main body 221 and an electrode tab 222. The electrode tab 222 is connected to one end of the main body 221 facing the wall 211 in the thickness direction X of the wall. A second protrusion 2412 is provided on the second surface 241, and the second protrusion 2412 abuts against the main body 221 along the thickness direction X of the wall.

[0282] The second surface 241 is provided with a second protrusion 2412, that is, the second protrusion 2412 protrudes from the surface of the first insulating member 24 where the second groove 2411 is provided.

[0283] Along the thickness direction X of the wall portion, the second protrusion 2412 abuts against the main body portion 221, that is, the second protrusion 2412 and the main body portion 221 of the electrode assembly 22 are arranged along the thickness direction X of the wall portion and abut against each other.

[0284] Optionally, the second protrusion 2412 protruding from the second surface 241 can be one or more. For example, in Figure 9In this embodiment, four second protrusions 2412 are provided on the second surface 241, and at least some of the four second protrusions 2412 are spaced apart along the first direction Y. Of course, in other embodiments, the second protrusions 2412 provided on the second surface 241 can also be two, three, five, six, seven or eight, etc.

[0285] In this embodiment, by providing a second protrusion 2412 on the second surface 241 of the first insulating member 24 where the second groove 2411 is provided, and the second protrusion 2412 having abuts against the main body 221 of the electrode assembly 22 in the thickness direction X of the wall portion, the first insulating member 24 and the main body 221 of the electrode assembly 22 can also play a role in mutual positioning and stabilization, thereby improving the stability of the first insulating member 24 between the main body 221 and the wall portion 211, and improving the stability of the electrode assembly 22 within the housing 21, which helps to reduce the risk of shaking or displacement of the first insulating member 24 and the electrode assembly 22 during use.

[0286] According to some embodiments of this application, see Figure 7 As shown, the Vickers hardness of the area of ​​the wall portion 211 where the first groove 2111b is not provided on the first surface 2111a is HV1, and the Vickers hardness of the area of ​​the wall portion 211 where the first groove 2111b is provided on the first surface 2111a is HV2, satisfying 1≤HV2-HV1≤10.

[0287] Wherein, HV1 is the Vickers hardness of the area of ​​the wall portion 211 corresponding to the first surface 2111a where the first groove 2111b is not provided. In the embodiment where the end cap 213 is the wall portion 211, the wall portion 211 includes the body portion 2111 and the edge portion 2112, and the body portion 2111 has the first surface 2111a, then HV1 is the Vickers hardness of the area of ​​the body portion 2111 corresponding to the first surface 2111a where the first groove 2111b is not provided, and HV2 is the Vickers hardness of the bottom wall of the first groove 2111b.

[0288] For example, HV1 is 32-34 and HV2 is 35-39.

[0289] In this embodiment, by setting the Vickers hardness of the area of ​​the wall portion 211 corresponding to the first surface 2111a where the first groove 2111b is formed to be 1 to 10 greater than the Vickers hardness of the area of ​​the wall portion 211 corresponding to the first surface 2111a where the first groove 2111b is not formed, the structure of the area of ​​the wall portion 211 where the first groove 2111b is formed can be formed by stamping. The battery cell 20 with this structure can reduce the forming difficulty of the wall portion 211, thereby reducing the manufacturing difficulty of the battery cell 20. On the other hand, it can effectively improve the structural strength of the thinned area of ​​the wall portion 211, thereby reducing the risk of deformation or cracking in the area of ​​the wall portion 211 where the first groove 2111b is set during use.

[0290] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 of any of the above schemes.

[0291] Among them, see Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0292] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0293] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together 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 covers the open side of the second box body 12.

[0294] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0295] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in... Figure 2In the battery device 100, multiple battery cells 20 are arranged inside the housing 10. The multiple battery cells 20 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 20 is housed in the housing 10. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in the housing 10.

[0296] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0297] It should be noted that in some embodiments, the battery device 100 may not have a housing 10. The battery device 100 includes multiple battery cells 20, and the battery device 100 composed of multiple battery cells 20 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0298] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 or a battery device 100 of any of the above schemes.

[0299] The electrical device can be any of the aforementioned devices or systems that use a single battery cell 20 or a battery device 100.

[0300] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0301] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer shell has walls; Electrode assembly, housed within the housing; as well as A first insulating element is at least partially disposed between the wall portion and the electrode assembly; Along the thickness direction of the wall portion, the wall portion has a first surface facing the electrode assembly, the first surface is provided with a first groove, the first insulating member has a second surface away from the wall portion and a third surface facing the wall portion, the second surface is provided with a second groove, and the third surface is formed with a first protrusion at a position corresponding to the second groove, at least a portion of the first protrusion is accommodated in the first groove.

2. The battery cell according to claim 1, characterized in that, The electrode assembly includes a main body and an electrode tab, wherein the electrode tab is connected to one end of the main body facing the wall in the thickness direction of the wall; The battery cell also includes an electrode lead-out member disposed on the wall portion. The electrode lead-out member includes a first connecting portion connected to the tab, and a portion of the first insulating member is located between the first connecting portion and the wall portion. Wherein, along the thickness direction of the wall portion, at least a portion of the first connecting portion and at least a portion of the electrode tab are both accommodated within the second groove.

3. The battery cell according to claim 2, characterized in that, The bottom surface of the second groove is provided with a limiting part, which surrounds the outer periphery of the first connecting part.

4. The battery cell according to claim 3, characterized in that, The limiting part is a ring structure that extends circumferentially along the first connecting part.

5. The battery cell according to claim 4, characterized in that, The limiting portion is configured to divide the second groove into a first groove and a second groove, the first groove being located inside the limiting portion and the second groove being located outside the limiting portion, and the second groove being arranged around the first groove; Wherein, at least a portion of the first connecting portion is accommodated in the first groove, and at least a portion of the electrode tab is accommodated in the second groove.

6. The battery cell according to claim 2, characterized in that, The electrode includes: A connecting region is located on the side of the first connecting portion away from the wall portion in the thickness direction of the wall portion and is connected to the first connecting portion; A bending area connects the connecting area and the main body. Wherein, at least a portion of the bending area is accommodated within the second groove along the thickness direction of the wall portion.

7. The battery cell according to claim 6, characterized in that, The bending area is bent into multiple bending segments, which are connected sequentially, and the bending segments at both ends are respectively connected to the connecting area and the main body.

8. The battery cell according to claim 6, characterized in that, The battery cell includes two electrode leads, which are spaced apart on the wall portion along a first direction; The electrode assembly includes two tabs with opposite polarities. Both tabs are connected to one end of the main body facing the wall in the thickness direction of the wall. The two tabs are arranged at intervals along the first direction. Each tab is connected to the first connecting portion of an electrode lead-out. The bending area and the first connecting portion are arranged along the second direction, and the thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other.

9. The battery cell according to claim 2, characterized in that, The bottom surface of the first groove is provided with an electrode lead-out hole. The electrode lead-out component also includes a lead-out part and a second connecting part. Along the thickness direction of the wall, the lead-out part is located on the side of the wall away from the electrode assembly. The second connecting part passes through the electrode lead-out hole and connects the lead-out part and the first connecting part. The bottom surface of the second groove is provided with a through hole, and the through hole is provided corresponding to the electrode lead-out hole along the thickness direction of the wall, and the second connecting part passes through the through hole.

10. The battery cell according to claim 9, characterized in that, The second connecting part is riveted to the lead-out part.

11. The battery cell according to claim 9, characterized in that, The first connecting part and the second connecting part are integrally formed.

12. The battery cell according to claim 11, characterized in that, Along the thickness direction of the wall portion, the second connecting portion protrudes from the surface of the first connecting portion facing the wall portion.

13. The battery cell according to claim 9, characterized in that, The first connecting part and the second connecting part are separately provided.

14. The battery cell according to claim 13, characterized in that, The first connecting part and the second connecting part are welded together.

15. The battery cell according to claim 9, characterized in that, The battery cell further includes a second insulating member, at least a portion of which is disposed between the wall portion and the lead-out portion.

16. The battery cell according to claim 15, characterized in that, The wall portion has a fourth surface facing away from the electrode assembly in the thickness direction of the wall portion. The fourth surface is provided with an assembly groove. The assembly groove and the first groove are correspondingly provided along the thickness direction of the wall portion, and the electrode lead-out hole connects the assembly groove and the first groove. Wherein, at least a portion of the second insulating member is accommodated within the assembly groove along the thickness direction of the wall portion.

17. The battery cell according to claim 16, characterized in that, Along the thickness direction of the wall portion, the minimum distance between the bottom surface of the mounting groove and the bottom surface of the first groove is L2, which satisfies 0.5mm≤L2≤3mm.

18. The battery cell according to claim 9, characterized in that, The battery cell also includes: A seal is disposed between the second connecting portion and the wall portion, the seal being configured to seal the gap between the second connecting portion and the wall surface of the electrode lead-out hole.

19. The battery cell according to claim 1, characterized in that, The wall portion has a fourth surface facing away from the electrode assembly in the thickness direction of the wall portion. The distance between the fourth surface and the first surface is D in the thickness direction of the wall portion, and the groove depth of the first groove is H, satisfying 0.05≤H / D≤0.

875.

20. The battery cell according to claim 19, characterized in that, 1mm≤D≤4mm.

21. The battery cell according to any one of claims 1-20, characterized in that, The outer casing includes: The housing has an internally formed receiving cavity with an opening, and the electrode assembly is received within the receiving cavity; End cap, to close the opening; The end cap is the wall portion.

22. The battery cell according to claim 21, characterized in that, At least a portion of the wall portion is inserted into the receiving cavity from the opening, the wall portion has a first outer peripheral surface that abuts against the inner peripheral surface of the housing, and the wall portion is welded to the housing; The minimum distance between the side surface of the first groove and the first outer peripheral surface is L1, which satisfies 1mm≤L1≤5mm.

23. The battery cell according to claim 22, characterized in that, 1.5mm≤L1≤4mm.

24. The battery cell according to claim 22, characterized in that, The wall portion includes: The body portion, along the thickness direction of the wall portion, is partially inserted into the receiving cavity through the opening, the body portion having the first outer peripheral surface, and the body portion having the first surface; An edge portion protrudes from the first outer peripheral surface, and the edge portion abuts against the end of the housing where the opening is provided along the thickness direction of the wall portion.

25. The battery cell according to claim 24, characterized in that, The edge portion is a ring structure surrounding the body portion.

26. The battery cell according to any one of claims 1-20, characterized in that, The outer casing includes: The housing includes an integrally formed sidewall and a bottom wall. The sidewall surrounds the bottom wall. Along the thickness direction of the wall portion, one end of the sidewall is connected to the bottom wall, and the other end forms an opening. The sidewall and the bottom wall together define a receiving cavity, in which the electrode assembly is received. End cap, to close the opening; The bottom wall is the wall portion.

27. The battery cell according to claim 1, characterized in that, The electrode assembly includes a main body and an electrode tab, wherein the electrode tab is connected to one end of the main body facing the wall in the thickness direction of the wall; The second surface is provided with a second protrusion, which abuts against the main body along the thickness direction of the wall portion.

28. The battery cell according to claim 1, characterized in that, The Vickers hardness of the area of ​​the wall portion on the first surface where the first groove is not provided is HV1, and the Vickers hardness of the area of ​​the wall portion on the first surface where the first groove is provided is HV2, satisfying 1≤HV2-HV1≤10.

29. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-28.

30. An electrical device, characterized in that, Includes a battery cell as described in any one of claims 1-28 or a battery device as described in claim 29.

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