Battery cell, manufacturing method for battery cell, battery and electric device

Abstract

Provided in the present application are a battery cell, a manufacturing method for the battery cell, a battery and an electric device. The battery cell comprises an electrode assembly, a casing and a support member. The casing is configured to accommodate the electrode assembly, and there is a gap between at least part of the outer periphery of the electrode assembly and an inner wall of the casing. The support member is arranged between the electrode assembly and the inner wall of the casing and is configured to fill the gap.

Description

Battery cell, method for manufacturing battery cell, battery, and electric device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411324339.7, filed on September 23, 2024, entitled “Battery cell, method for manufacturing battery cell, battery, and electric device”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, and in particular to a battery cell, a method for manufacturing a battery cell, a battery, and an electric device. BACKGROUND

[0004] With the development of new energy technology, batteries are increasingly widely used, for example, in mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, and electric tools.

[0005] In the development of battery cell technology, the reliability of the battery cell directly affects the reliability, use cost, and user experience of the terminal product. Therefore, how to effectively improve the reliability of the battery cell is a continuous improvement technical problem in the battery technology. SUMMARY

[0006] In view of the above problems, the present application provides a battery cell, a battery, and an electric device, which can effectively improve the reliability of the battery cell.

[0007] In a first aspect, an embodiment of the present application provides a battery cell, the battery cell comprising an electrode assembly, a shell, and a support component, the shell being configured to accommodate the electrode assembly, and a gap being formed between an outer periphery of the electrode assembly and an inner wall of the shell. The support component is disposed between the electrode assembly and the inner wall of the shell and is configured to fill the gap.

[0008] The support component of the above technical solution can support the inner wall of the shell to reduce the risk of wrinkles or collapse of the shell during the manufacturing process of the battery cell, and can effectively improve the reliability of the battery cell.

[0009] In some embodiments of the first aspect, the shell comprises a first end wall, a second end wall, and a first side wall, the first end wall and the second end wall being oppositely disposed along a first direction, the electrode assembly being accommodated in the shell and located between the first end wall and the second end wall, the first side wall being connected to the first end wall and disposed around the electrode assembly, at least a portion of the first side wall being inclined away from the electrode assembly. The support component is disposed along the outer periphery of the electrode assembly, and the support component at least partially conforms to the first side wall.

[0010] The support component can support the first side wall to reduce the risk of the first side wall being wrinkled or collapsed during the manufacturing process of the battery cell, and effectively improve the reliability of the battery cell.

[0011] In some embodiments of the first aspect, the electrode assembly includes a plurality of pole pieces stacked along a first direction. The support component surrounds an outer periphery of the electrode assembly, and an axis of the support component surrounds parallel to the first direction.

[0012] On the one hand, the support effect of the support component can be further improved, thereby further reducing the risk of the first side wall being wrinkled or collapsed. On the other hand, the axis of the support component surrounds parallel to the first direction, so that the support component can fix the plurality of pole pieces stacked along the first direction, thereby improving the stability between the plurality of pole pieces.

[0013] In some embodiments of the first aspect, the electrode assembly includes a plurality of first pole pieces and a plurality of second pole pieces, the first pole pieces and the second pole pieces are alternately arranged along the first direction, and the first pole pieces and the second pole pieces have opposite polarities. The first pole piece includes a first main body region and a first tab extending from the first main body region, the second pole piece includes a second main body region and a second tab extending from the second main body region, a projection of the second main body region in the first direction is located within a projection of the first main body region in the first direction, and there is a gap between the first main body regions of two adjacent first pole pieces. The support component includes a main body portion and an extension portion, the main body portion is arranged along the outer periphery of the electrode assembly, and the extension portion is inserted into the gap.

[0014] The above technical solution not only improves the consistency between the support component and the electrode assembly, but also further improves the fixing effect of the support component on the plurality of first pole pieces and the plurality of second pole pieces.

[0015] In some embodiments of the first aspect, at least part of a side surface of the support component facing the first side wall protrudes in a direction close to the first side wall to form a first convex surface.

[0016] The above technical solution introduces the first convex surface, which can further improve the support effect of the support component on the first side wall, thereby further reducing the risk of the first side wall being wrinkled or collapsed.

[0017] In some embodiments of the first aspect, the first convex surface is a combination of a plurality of planes or an arc surface.

[0018] By setting the first convex surface as a combination of planes, the preparation difficulty of the first convex surface can be reduced, the preparation process can be simplified, and the overall preparation cost of the support component can be reduced. By setting the first convex surface as an arc surface, the first side wall can be smoothly extended, thereby further reducing the risk of the first side wall being wrinkled or collapsed.

[0019] In some embodiments of the first aspect, the support component comprises a first edge portion and a second edge portion, the first edge portion is connected with the second edge portion, and a rounded corner is arranged between the side edge of the first edge portion away from the electrode assembly and the side edge of the second edge portion away from the electrode assembly.

[0020] The above technical solution can further reduce the risk of wrinkles or collapse of the first side wall by arranging a rounded corner between the side edge of the first edge portion of the support component away from the electrode assembly and the side edge of the second edge portion away from the electrode assembly. In addition, the arrangement of the rounded corner can also reduce the risk of the support component piercing the shell, thereby further improving the reliability of the battery monomer.

[0021] In some embodiments of the first aspect, the shell comprises a first shell portion and a second shell portion, the first shell portion and the second shell portion are overlapped with each other along a first direction. The first shell portion comprises a first end wall and a first side wall, and the first end wall and the first side wall define a first cavity. The second shell portion comprises a second end wall and a second side wall, the second side wall is connected to the second end wall and is arranged around the electrode assembly, at least part of the second side wall is inclined away from the electrode assembly, the support component is at least partially attached to the second side wall, the second end wall and the second side wall define a second cavity, and the first cavity and the second cavity cooperate to form a containing cavity for containing the electrode assembly.

[0022] The above technical solution, on the one hand, by forming the first shell portion and the second shell portion first and then overlapping the first shell portion and the second shell portion to form the shell, is conducive to improving the overall preparation efficiency of the shell; on the other hand, the support component can support the second side wall to reduce the risk of wrinkles or collapse of the second side wall during the manufacturing process of the battery monomer, which can effectively improve the reliability of the battery monomer.

[0023] In some embodiments of the first aspect, the support component comprises a first support member and a second support member, the first support member and the second support member are stacked along a first direction, the first support member is at least partially attached to the first side wall, and the second support member is at least partially attached to the second side wall.

[0024] The above technical solution can design the first support member according to the structure and shape of the first side wall, and design the second support member according to the structure and shape of the second side wall, thereby improving the design flexibility and assembly convenience of the support component, thereby facilitating to improve the overall support effect of the support component and the production efficiency of the battery monomer.

[0025] In some embodiments of the first aspect, the first support member comprises a plurality of first sub-components stacked along the first direction, each first sub-component at least partially conforming to the first side wall; and / or the second support member comprises a plurality of second sub-components stacked along the first direction, each second sub-component at least partially conforming to the second side wall.

[0026] By further subdividing the first support member into a plurality of first sub-components, the first support member can be further adapted to the structural shape of the first side wall, thereby facilitating further improvement of the support effect of the first support member on the first side wall. In addition, the design flexibility of the first support member can also be improved. By further subdividing the second support member into a plurality of second sub-components, the second support member can be further adapted to the structural shape of the second side wall, thereby facilitating further improvement of the support effect of the second support member on the second side wall. In addition, the design flexibility of the second support member can also be improved.

[0027] In some embodiments of the first aspect, the housing further comprises a first connecting wall connected to the first side wall at a side facing away from the electrode assembly, the first connecting wall being connected to the second end wall.

[0028] The above technical solution can improve the contact area between the first connecting wall and the second end wall, thereby improving the structural stability of the housing and further improving the reliability of the battery cell.

[0029] In a second aspect, embodiments of the present application provide a manufacturing method of a battery cell, the manufacturing method of the battery cell comprising:

[0030] providing a housing;

[0031] providing an electrode assembly and a support member, and installing the electrode assembly and the support member in the housing, wherein a gap is formed between at least part of the outer periphery of the electrode assembly and the inner wall of the housing, and the support member is arranged between the electrode assembly and the inner wall of the housing and used to fill the gap;

[0032] encapsulating the housing.

[0033] The support member of the above technical solution can support the inner wall of the housing to reduce the risk of wrinkles or collapse of the housing during the manufacturing process of the battery cell, thereby effectively improving the reliability of the battery cell.

[0034] In some embodiments of the second aspect, the step of providing an electrode assembly and a support member, and installing the electrode assembly and the support member in the housing comprises:

[0035] providing an electrode assembly;

[0036] providing a support member, and arranging the support member on the electrode assembly;

[0037] The electrode assembly provided with the support component is installed in the shell.

[0038] The above technical solution first sets the support component on the electrode assembly, and then installs the electrode assembly provided with the support component in the shell, which can reduce the influence of the electrode assembly and the support component on the shell during installation, reduce the risk of shell damage, and improve product yield.

[0039] In some embodiments of the second aspect, the step of providing the support component and setting the support component on the electrode assembly comprises:

[0040] Gluing is performed on a preset position of the electrode assembly to form the support component.

[0041] The above technical solution forms the support component on the electrode assembly by gluing, which can reduce the risk of damage to the electrode assembly due to interference between the electrode assembly and the support component during installation. In addition, the gluing process is simple, which is conducive to reducing the overall production cost of the battery cell.

[0042] In some embodiments of the second aspect, the step of providing the support component and setting the support component on the electrode assembly comprises:

[0043] A mold is provided, and the electrode assembly is placed in the mold, wherein the mold is used to prepare the support component;

[0044] Glue is injected into the mold to form the support component on a preset position of the electrode assembly;

[0045] The electrode assembly provided with the support component is taken out of the mold.

[0046] The above technical solution can effectively improve the forming precision of the support component.

[0047] In some embodiments of the second aspect, the step of providing the shell comprises:

[0048] A first shell part and a second shell part are provided, wherein the first shell part comprises a first end wall and a first side wall, the first end wall and the first side wall defining a first cavity, the second shell part comprises a second end wall and a second side wall, the second side wall being connected to the second end wall, the second end wall and the second side wall defining a second cavity, at least part of the second side wall being outwardly inclined;

[0049] The electrode assembly and the support component are provided, and the step of installing the electrode assembly and the support component in the shell comprises:

[0050] The electrode assembly and the support component are provided, and the step of installing the electrode assembly and the support component in the shell comprises:

[0051] The first shell part and the second shell part are overlapped with each other to form a containing cavity for containing the electrode assembly, wherein the support part is at least partially attached to the second side wall;

[0052] The step of packaging the shell comprises:

[0053] The first side wall and the second side wall are connected to close the containing cavity.

[0054] The above technical solution forms the first shell part and the second shell part first, and then overlaps the first shell part and the second shell part to form the shell, which is beneficial to improve the overall preparation efficiency of the shell. In addition, the support part can support the second side wall to reduce the risk of wrinkles or collapse of the second side wall during the manufacturing process of the battery monomer, which can effectively improve the reliability of the battery monomer.

[0055] In some embodiments of the second aspect, the electrode assembly and the support part are provided, and the step of installing the electrode assembly and the support part in at least one of the first cavity and the second cavity comprises:

[0056] The electrode assembly is provided;

[0057] The first support and the second support are provided, and the first support and the second support are respectively installed in the first cavity and the second cavity, wherein the first support is at least partially attached to the first side wall, and the second support is at least partially attached to the second side wall;

[0058] The electrode assembly is installed in one of the first cavity and the second cavity.

[0059] On the one hand, the first support and the second support are respectively installed in the first cavity and the second cavity, and then the electrode assembly is installed in one of the first cavity and the second cavity, which can reduce the influence of the electrode assembly, the first support and the second support on the electrode assembly during installation, reduce the risk of the electrode assembly of the shell, and improve the product yield. On the other hand, the first support can be designed according to the structure and shape of the first side wall, and the second support can be designed according to the structure and shape of the second side wall, thereby improving the design flexibility and assembly convenience of the support part, thereby facilitating the improvement of the overall support effect of the support part and the production efficiency of the battery monomer.

[0060] In some embodiments of the second aspect, the first support and the second support are provided, and the step of installing the first support and the second support in the first cavity and the second cavity respectively comprises:

[0061] Glue is applied on the predetermined positions of the first cavity and the second cavity to form the first support and the second support.

[0062] The technical solution above forms the first support member and the second support member on the preset positions of the first cavity and the second cavity through the gluing manner, which can reduce the risk of damage of the shell. In addition, the gluing process is simple, which is conducive to reducing the overall production cost of the battery monomer.

[0063] In some embodiments of the second aspect, the steps of providing the electrode assembly and the support component and mounting the electrode assembly and the support component in the shell include:

[0064] providing the electrode assembly;

[0065] providing the first support member and the second support member, and mounting the first support member and the second support member on the electrode assembly in the first direction;

[0066] mounting the electrode assembly provided with the first support member and the second support member in one of the first cavity and the second cavity;

[0067] wherein the first support member at least partially fits the first side wall, and the second support member at least partially fits the second side wall.

[0068] On the one hand, the first support member and the second support member are first arranged on the electrode assembly, and then the electrode assembly provided with the first support member and the second support member is mounted in the shell, which can reduce the influence of the electrode assembly, the first support member and the second support member on the shell during the mounting process, reduce the risk of damage of the shell, and improve the product yield. On the other hand, the first support member can be designed according to the structure and shape of the first side wall, and the second support member can be designed according to the structure and shape of the second side wall, thereby improving the design flexibility and assembly convenience of the support component, thereby facilitating the improvement of the overall support effect of the support component and the production efficiency of the battery monomer.

[0069] In some embodiments of the second aspect, the steps of providing the first support member and the second support member and mounting the first support member and the second support member on the electrode assembly include:

[0070] providing a plurality of first sub-components, and mounting the plurality of first sub-components on the electrode assembly in sequence, wherein the plurality of first sub-components are stacked in the first direction;

[0071] providing a plurality of second sub-components, and mounting the plurality of second sub-components on the electrode assembly in sequence, wherein the plurality of second sub-components are stacked in the first direction;

[0072] wherein each first sub-component at least partially fits the first side wall, and each second sub-component at least partially fits the second side wall.

[0073] The technical solution can further improve the fine degree of the structure shape adaptation of the first support to the first side wall, thereby facilitating further improvement of the support effect of the first support to the first side wall. In addition, the design flexibility of the first support can be improved. The technical solution can further improve the fine degree of the structure shape adaptation of the second support to the second side wall, thereby facilitating further improvement of the support effect of the second support to the second side wall. In addition, the design flexibility of the second support can be improved.

[0074] In some embodiments of the second aspect, the step of providing the electrode assembly comprises:

[0075] providing a first number of first poles and a first number of second poles;

[0076] providing a second number of first poles and a second number of second poles;

[0077] wherein the first poles and the second poles have opposite polarities;

[0078] providing a plurality of first sub-components, the step of sequentially mounting the plurality of first sub-components to the electrode assembly comprises:

[0079] providing a first number of first sub-components;

[0080] assembling the first number of first poles, the first number of second poles, and the first number of first sub-components to obtain a first assembly component, wherein the first assembly component comprises a first number of first assembly members stacked along a first direction, in each first assembly member, the first pole and the second pole are arranged in a stacked manner along the first direction, and the first sub-component is connected to at least one of the first pole and the second pole;

[0081] providing a plurality of second sub-components, the step of sequentially mounting the plurality of second sub-components to the electrode assembly comprises:

[0082] providing a second number of second sub-components;

[0083] assembling the second number of second poles, the second number of second poles, and the second number of second sub-components to obtain a second assembly component, wherein the second assembly component comprises a second number of second assembly members, in each second assembly member, the first pole and the second pole are arranged in a stacked manner along the first direction, and the second sub-component is connected to at least one of the first pole and the second pole;

[0084] wherein the second assembly component is arranged in a stacked manner along the first direction with the first assembly component.

[0085] The technical scheme can improve the assembly precision between the support component and the electrode assembly by assembling the first sub-component and the pole piece layer by layer and assembling the second sub-component and the pole piece layer by layer.

[0086] In a third aspect, the present application provides a battery including the battery cell according to any one of the embodiments of the first aspect.

[0087] In a fourth aspect, the present application provides a power consuming device including the battery according to any one of the embodiments of the second aspect, and the battery is used to provide electric energy.

[0088] The above description is only a summary of the technical scheme of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0089] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Furthermore, the same reference numerals are used throughout the several views that follow. In the drawings:

[0090] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0091] FIG. 2 is an exploded structural schematic diagram of a battery according to some embodiments of the present application;

[0092] FIG. 3 is an exploded structural schematic diagram of a battery cell according to some embodiments of the present application;

[0093] FIG. 4 is a top view structural schematic diagram of the battery cell shown in FIG. 3;

[0094] FIG. 5 is a cross-sectional structural schematic diagram of FIG. 4 along A-A;

[0095] FIG. 6 is a top view structural schematic diagram of the cooperation between an electrode assembly and a support component of a battery cell according to some embodiments of the present application;

[0096] FIG. 7 is a cross-sectional structural schematic diagram of FIG. 6 along B-B;

[0097] FIG. 8 is a top view structural schematic diagram of the cooperation between an electrode assembly and a support component of another battery cell according to some embodiments of the present application;

[0098] FIG. 9 is a cross-sectional structural schematic diagram of FIG. 8 along C-C;

[0099] Figure 10 is a top view structural schematic diagram of the cooperation of an electrode assembly and a support component of yet another battery cell according to some embodiments of the present application;

[0100] Figure 11 is a sectional view structural schematic diagram of Figure 10 along D-D;

[0101] Figure 12 is a top view structural schematic diagram of the cooperation of an electrode assembly and a support component of still another battery cell according to some embodiments of the present application;

[0102] Figure 13 is a sectional view structural schematic diagram of Figure 12 along E-E;

[0103] Figure 14 is a top view structural schematic diagram of the cooperation of an electrode assembly and a support component of still another battery cell according to some embodiments of the present application;

[0104] Figure 15 is an exploded view structural schematic diagram of still another battery cell according to some embodiments of the present application;

[0105] Figure 16 is a top view structural schematic diagram of the battery cell shown in Figure 15;

[0106] Figure 17 is a sectional view structural schematic diagram of Figure 16 along F-F;

[0107] Figure 18 is a top view structural schematic diagram of the cooperation of an electrode assembly and a support component of still another battery cell according to some embodiments of the present application;

[0108] Figure 19 is a sectional view structural schematic diagram of Figure 18 along G-G;

[0109] Figure 20 is a top view structural schematic diagram of the cooperation of an electrode assembly and a support component of still another battery cell according to some embodiments of the present application;

[0110] Figure 21 is a sectional view structural schematic diagram of Figure 20 along H-H;

[0111] Figure 22 is a top view structural schematic diagram of the cooperation of an electrode assembly and a support component of still another battery cell according to some embodiments of the present application;

[0112] Figure 23 is a sectional view structural schematic diagram of Figure 21 along K-K;

[0113] Figure 24 is an exploded view structural schematic diagram of a housing of still another battery cell according to some embodiments of the present application;

[0114] Figure 25 is an exploded view structural schematic diagram of a housing of still another battery cell according to some embodiments of the present application;

[0115] Figure 26 is a top view structural schematic diagram of a housing of still another battery cell according to some embodiments of the present application;

[0116] FIG. 27 is a process flow diagram of another method of manufacturing a battery cell, according to some embodiments of the present application.

[0117] The reference signs in the detailed description of the embodiments are as follows: 1, vehicle; 2, battery; 3, controller; 4, motor; 5, case; 5a, first case portion; 5b, second case portion; 5c, accommodation space; 6, battery module; 7, battery cell; 10, electrode assembly; 11, electrode tab; 12, first electrode tab; 121, first main body region; 122, first tab; 13, second electrode tab; 131, second main body region; 132, second tab; 20, housing; 20a, first housing portion; 20b, second housing portion; 21, first end wall; 22, second end wall; 23, first side wall; 24, second side wall; 25, first cavity; 26, second cavity; 27, first connecting wall; 28, second connecting wall; 30, support member; 31, main body portion; 32, extension portion; 33, first edge portion; 34, second edge portion; 35, rounded corner; 36, first support; 361, first sub-member; 37, second support; 371, second sub-member; X, first direction. DETAILED DESCRIPTION

[0118] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0119] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0120] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to the other embodiments.

[0121] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "attachment" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0122] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0123] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0124] "Multiple" appearing in the present application means more than two (including two).

[0125] The term "parallel" in the present application not only includes the case of absolute parallel, but also includes the case of approximate parallel which is generally recognized in engineering; at the same time, "vertical" also not only includes the case of absolute vertical, but also includes the case of approximate vertical which is generally recognized in engineering.

[0126] In the embodiments of the present application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging to continue to use.

[0127] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead-acid battery cell, etc. The embodiments of the present application are not limited thereto.

[0128] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode.

[0129] In some embodiments, the electrode assembly further includes a separator, which is arranged between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0130] In some embodiments, the cathode can be a cathode sheet, which can include a cathode current collector and a cathode active material layer disposed on at least one surface of the cathode current collector.

[0131] In some embodiments, the anode can be an anode sheet, which can include an anode current collector and an anode active material layer disposed on at least one surface of the anode current collector.

[0132] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the cathode and the anode. The type of electrolyte is not specifically limited in the present application and can be selected as desired. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0133] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0134] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorobis(oxalato)borate, lithium bis(oxalato)borate, lithium difluorobis(oxalato)phosphate, and lithium tetrafluorobis(oxalato)phosphate.

[0135] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butanedisulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and a crown ether.

[0136] The gel-state electrolyte includes a polymer as a backbone network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0137] The solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0138] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, etc.

[0139] As an example, the inorganic solid-state electrolyte can be one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0140] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0141] In some embodiments, the electrode assembly is a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0142] In some embodiments, the electrode assembly is a stack structure.

[0143] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0144] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments that are stacked. One positive electrode sheet is clamped between adjacent folded segments.

[0145] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments that are stacked.

[0146] As an example, a plurality of separators can be provided, and each of the plurality of separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0147] As an example, the separators can be continuously provided and provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0148] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape.

[0149] In some embodiments, the electrode assembly can be provided with a tab. The tab can guide current out of the electrode assembly. The tab can include a positive tab and a negative tab.

[0150] In some embodiments, the battery cell can include a housing. The housing can be used to encapsulate the electrode assembly and other components such as the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

[0151] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of another shape. The prismatic battery cell can include a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, such as a hexagonal prismatic battery cell, and the like.

[0152] The battery mentioned in the embodiments of the present application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0153] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0154] In some embodiments, the battery can be a battery pack, and the battery pack comprises a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0155] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and longitudinal beam of the vehicle.

[0156] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0157] With the development of new energy technology, batteries are increasingly widely used, such as in mobile phones, laptops, electric cars, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, and electric tools.

[0158] In the development of battery cell technology, the reliability of the battery cell directly affects the reliability, use cost and user experience of the terminal product. In the manufacturing process of the battery cell, the shell of the battery cell often exerts a certain pressure on the electrode assembly located inside the shell, which is easy to cause damage to the electrode assembly and affect the reliability of the battery cell.

[0159] For example, in the current solid-state battery cell, an aluminum plastic film is used to directly package the electrode assembly. Specifically, the aluminum plastic film is provided with a pit, the electrode assembly is installed in the pit of the aluminum plastic film, and then the inside of the aluminum plastic film is vacuumized and the aluminum plastic film is heat-sealed to obtain a solid-state battery cell. However, after the electrode assembly is installed in the pit of the aluminum plastic film, there is often a gap between the electrode assembly and the inner wall of the pit, and there is no electrolyte in the solid-state battery cell. Therefore, after the inside of the aluminum plastic film is vacuumized, there is no support at the gap between the electrode assembly and the inner wall of the pit, so that the aluminum plastic film will wrinkle and collapse. The wrinkled and collapsed aluminum plastic film will exert a certain pressure on the electrode assembly, which is easy to cause damage to the electrode assembly and affect the reliability of the solid-state battery cell.

[0160] Based on the above considerations, the embodiments of the present application provide a battery cell. The shell is used to accommodate the electrode assembly, and the outer periphery of the electrode assembly has a gap with the inner wall of the shell at least in part. A support component is arranged between the electrode assembly and the inner wall of the shell and is used to fill the gap.

[0161] The technical solution described above sets the support component, which can support the inner wall of the shell to reduce the risk of the shell being wrinkled or collapsed during the manufacturing process of the battery monomer, and can effectively improve the reliability of the battery monomer.

[0162] The technical solution described in the embodiments of the present application is applicable to batteries and electric devices using batteries.

[0163] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above electric devices.

[0164] It should be understood that the technical solution described in the embodiments of the present application is not only limited to the above described batteries and electric devices, but can also be applied to all batteries including a battery box and electric devices using batteries, but for the sake of simplicity, the following embodiments are described taking an electric vehicle as an example.

[0165] FIG. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application.

[0166] With continued reference to FIG. 1, the inside of the vehicle 1 is provided with a battery 2, which can be arranged at the bottom, the head, or the tail of the vehicle 1. The battery 2 can be used for power supply of the vehicle 1, for example, the battery 2 can be used as an operating power source of the vehicle 1.

[0167] The vehicle 1 can further include a controller 3 and a motor 4, and the controller 3 is used to control the battery 2 to supply power to the motor 4, for example, to meet the power demand of the vehicle 1 during starting, navigation, and driving.

[0168] In some embodiments of the present application, the battery 2 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0169] FIG. 2 is an exploded structural schematic diagram of a battery provided by some embodiments of the present application.

[0170] With continued reference to FIG. 2, the battery 2 includes a box 5 and a battery monomer, and the battery monomer is contained in the box 5.

[0171] The box 5 is used to accommodate the battery cell, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box part 5a and a second box part 5b, the first box part 5a and the second box part 5b are mutually coverable, and the first box part 5a and the second box part 5b jointly define an accommodation space 5c for accommodating the battery cell. The second box part 5b can be a hollow structure with one end open, and the first box part 5a is a plate-like structure, which is coverable on the open side of the second box part 5b to form the box 5 with the accommodation space 5c; or the first box part 5a and the second box part 5b can both be hollow structures with one side open, and the open side of the first box part 5a is coverable on the open side of the second box part 5b to form the box 5 with the accommodation space 5c. Of course, the first box part 5a and the second box part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0172] To improve the sealing performance of the first box part 5a and the second box part 5b after being connected, a sealing member such as sealing glue, a sealing ring, etc. can be arranged between the first box part 5a and the second box part 5b.

[0173] Suppose that the first box part 5a is coverable on the top of the second box part 5b, the first box part 5a can also be referred to as an upper box cover, and the second box part 5b can also be referred to as a lower box.

[0174] In the battery 2, the battery cell can be one or multiple. If the battery cell is multiple, the multiple battery cells can be connected in series, in parallel or in a mixed manner, and the mixed manner means that the multiple battery cells are connected in series and in parallel. The multiple battery cells can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells is accommodated in the box 5; of course, the multiple battery cells can be first connected in series, in parallel or in a mixed manner to form a battery module 6, and then the multiple battery modules 6 are connected in series, in parallel or in a mixed manner to form a whole, which is accommodated in the box 5.

[0175] FIG. 3 is an exploded structural schematic view of a battery cell according to some embodiments of the present application, FIG. 4 is a top structural schematic view of the battery cell shown in FIG. 3, and FIG. 5 is a sectional structural schematic view of FIG. 4 along A-A.

[0176] Referring to FIGS. 3 to 5, the present embodiments provide a battery cell 7, which includes an electrode assembly 10, an outer shell 20 and a support member 30. The outer shell 20 is used to accommodate the electrode assembly 10, and a gap is present between the outer periphery of the electrode assembly 10 and the inner wall of the outer shell 20. The support member 30 is arranged between the electrode assembly 10 and the inner wall of the outer shell 20, and is used to fill the gap.

[0177] Exemplarily, the shell 20 is a component for forming an internal environment of the battery cell 7. The formed internal environment can be used to accommodate the electrode assembly 10, the electrolyte or other components. Optionally, the shell 20 can be made of, but is not limited to, a metal or a non-metal material. For example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metal material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0178] The shell 20 can be a sealed structure or a non-sealed structure. Exemplarily, when the shell 20 is a sealed structure, the shell 20 can play a role in protecting the electrode assembly 10 and preventing electrolyte leakage to some extent. When the shell 20 is a non-sealed structure, the shell 20 can play a role in protecting the electrode assembly 10, and a sealing bag can be further included between the shell 20 and the electrode assembly 10, which is used to package the electrode assembly 10 and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum plastic film.

[0179] The electrode assembly 10 is a component in which an electrochemical reaction occurs in the battery cell 7. The electrode assembly 10 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting an electrode body of the electrode assembly 10, and a portion without active material constituting a tab of each of the positive electrode sheet and the negative electrode sheet. The positive electrode tab and the negative electrode tab can be located together at one end of the electrode body or respectively at two ends of the electrode body.

[0180] The inner wall of the shell 20 refers to a side wall surface of the shell 20 facing the electrode assembly 10, and the outer wall of the shell 20 refers to a side wall surface of the shell 20 facing away from the electrode assembly 10.

[0181] In some examples, the battery cell 7 of the embodiment of the present application is a solid-state battery cell 7, and the shell 20 is an aluminum plastic film.

[0182] It can be understood that, during the forming of the shell 20, the internal space of the shell 20 is usually slightly larger than the volume of the electrode assembly 10, so as to facilitate the assembly of the electrode assembly 10 and improve the preparation yield of the shell 20. After the electrode assembly 10 is installed into the shell 20, a gap is formed between the outer periphery of the electrode assembly 10 and the inner wall of the shell 20 at least in part. Due to the existence of the gap, the shell 20 is prone to wrinkles and collapse after packaging. The wrinkled and collapsed shell 20 will generate a certain pressure on the electrode assembly 10, which is easy to cause damage to the electrode assembly 10.

[0183] Therefore, the above technical solution can reduce the risk of wrinkles or collapse of the shell 20 in the manufacturing process of the battery cell 7 by arranging the support component 30 to support the inner wall of the shell 20, thereby effectively improving the reliability of the battery cell 7.

[0184] In some embodiments, the housing 20 comprises a first end wall 21, a second end wall 22 and a first side wall 23, the first end wall 21 and the second end wall 22 are oppositely arranged along the first direction X, the electrode assembly 10 is accommodated in the housing 20 and located between the first end wall 21 and the second end wall 22, the first side wall 23 is connected to the first end wall 21 and arranged around the electrode assembly 10, at least part of the first side wall 23 is inclined away from the electrode assembly 10. The support member 30 is accommodated in the housing 20 and arranged along the outer periphery of the electrode assembly 10, the support member 30 is at least partially attached to the first side wall 23.

[0185] The first side wall 23 is connected to the first end wall 21 and arranged around the electrode assembly 10. Exemplarily, the first side wall 23 can be detachably connected to the first end wall 21, or integrally provided on the first end wall 21, the first side wall 23 can be directly connected to the first end wall 21, or limited on the first end wall 21 by other components. The first side wall 23 is used to connect the second end wall 22. The first side wall 23 can be directly connected to the second end wall 22, or limited on the second end wall 22 by other components.

[0186] In some examples, the first end wall 21 and the second end wall 22 are both plate-like structures, the first side wall 23 is integrally formed with the first end wall 21, the first side wall 23 and the first end wall 21 jointly define an accommodation cavity for accommodating the electrode assembly 10 and an opening, the opening is opposite to the first end wall 21. In the manufacturing process of the battery cell 7, the electrode assembly 10 is first placed in the accommodation cavity, and then the second end wall 22 is covered on the opening and connected to the first side wall 23 to close the accommodation cavity.

[0187] At least part of the first side wall 23 is inclined away from the electrode assembly 10. It should be noted that the housing 20 is formed by stamping the first end wall 21 and the first side wall 23, the first end wall 21 and the first side wall 23 surround the first cavity 25, the first side wall 23 will have a certain inclination, in other words, the included angle between the first side wall 23 and the first end wall 21 is obtuse, so as to reduce the risk of breaking at the connection between the first end wall 21 and the first side wall 23 in the stamping process, and improve the product yield of the housing 20.

[0188] In the manufacturing process of the battery cell 7, after the electrode assembly 10 is installed in the first cavity 25 surrounded by the first end wall 21 and the first side wall 23, there is a gap between the electrode assembly 10 and the first side wall 23. After the housing 20 is processed, for example, the inside of the housing 20 is vacuumed, the housing 20 is prone to wrinkles and collapse, and the wrinkled and collapsed housing 20 will generate a certain pressure on the electrode assembly 10, which is easy to cause damage to the electrode assembly 10.

[0189] The support member 30 is arranged along the outer periphery of the electrode assembly 10, in other words, the support member 30 is arranged along the periphery of the side wall. Exemplarily, the support member 30 can be arranged as a plurality of support members 30 which are arranged along the outer periphery of the electrode assembly 10 at intervals, or the support member 30 can be arranged as one support member 30 which surrounds the outer periphery of the electrode assembly 10.

[0190] The support member 30 is at least partially attached to the first side wall 23, which can be understood as that the entire support member 30 is attached to a part of the first side wall 23, or a part of the support member 30 is attached to a part of the first side wall 23, or a part of the support member 30 is attached to the entire first side wall 23, and the entire support member 30 is attached to the entire first side wall 23.

[0191] In some examples, the support member 30 can be detachably connected to the electrode assembly 10, or can be integrally arranged on the electrode assembly 10. The first side wall 23 can be directly connected to the electrode assembly 10, or can be limited on the electrode assembly 10 by other components.

[0192] In some examples, the support member 30 can be detachably connected to the housing 20, or can be integrally arranged on the housing 20. The first side wall 23 can be directly connected to the housing 20, or can be limited on the housing 20 by other components.

[0193] Optionally, the support member 30 can be made of an insulating material, for example, polyethylene, polypropylene, epoxy resin, polyurethane, silicone rubber, polyimide, or polyethylene terephthalate, etc.

[0194] The support member 30 of the above technical solution can support the first side wall 23, so as to reduce the risk of wrinkles or collapse of the first side wall 23 in the manufacturing process of the battery cell 7, and can effectively improve the reliability of the battery cell 7.

[0195] FIG. 6 is a top view structural schematic diagram of the electrode assembly 10 and the support member 30 of a battery cell 7 provided by some embodiments of the present application, and FIG. 7 is a sectional view structural schematic diagram of FIG. 6 along B-B.

[0196] With reference to FIGS. 6-7, in some embodiments, the electrode assembly 10 includes a plurality of electrode plates 11 stacked along a first direction X. The support member 30 surrounds the outer periphery of the electrode assembly 10, and the surrounding axis of the support member 30 is parallel to the first direction X.

[0197] On the one hand, the supporting effect of the supporting component 30 can be further improved, thereby further reducing the risk of wrinkles or collapse of the first side wall 23; on the other hand, the surrounding axis of the supporting component 30 is parallel to the first direction X, so that the supporting component 30 can fix the plurality of pole pieces 11 stacked along the first direction X to improve the stability between the plurality of pole pieces 11.

[0198] FIG. 8 is a top view structural schematic diagram of another electrode assembly 10 and supporting component 30 of a battery cell 7 provided by some embodiments of the present application, and FIG. 9 is a sectional view structural schematic diagram of FIG. 8 along C-C.

[0199] With continued reference to FIGS. 8-9, in some embodiments, the electrode assembly 10 includes a plurality of first pole pieces 12 and a plurality of second pole pieces 13, the first pole pieces 12 and the second pole pieces 13 are alternately stacked along the first direction X, and the first pole pieces 12 and the second pole pieces 13 are opposite in polarity. The first pole piece 12 includes a first body region 121 and a first tab 122 extending from the first body region 121, and the second pole piece 13 includes a second body region 131 and a second tab 132 extending from the second body region 131, a projection of the second body region 131 in the first direction X is located within a projection of the first body region 121 in the first direction X, and there is a gap between the first body regions 121 of two adjacent first pole pieces 12. The supporting component 30 includes a main body portion 31 and an extension portion 32, the main body portion 31 is arranged along the outer periphery of the electrode assembly 10, and the extension portion 32 is inserted into the gap.

[0200] The first pole pieces 12 and the second pole pieces 13 are opposite in polarity, for example, the first pole pieces 12 are negative pole pieces, and the second pole pieces 13 are positive pole pieces. The projection of the second body region 131 in the first direction X is located within the projection of the first body region 121 in the first direction X, so that the positive pole pieces can more easily completely cover the negative pole pieces, and during the charging and discharging process of the battery, the risk of short circuit caused by misalignment of the pole pieces 11 or manufacturing tolerance can be reduced.

[0201] For example, the first pole pieces 12 and the second pole pieces 13 are both in a sheet structure, and the first pole pieces 12 and the second pole pieces 13 are alternately stacked along the first direction X to form a laminated structure. The first body region 121 is a portion of the first pole piece 12 coated with an active material layer, and the first tab 122 is a portion of the first pole piece 12 not coated with an active material layer. The second body region 131 is a portion of the second pole piece 13 coated with an active material layer, and the second tab 132 is a portion of the second pole piece 13 not coated with an active material layer.

[0202] In some examples, the electrode assembly 10 further includes a separator for separating the first pole pieces 12 and the second pole pieces 13.

[0203] The extension part 32 can be provided separately from the main body part 31, or integrally provided on the main body part 31. The extension part 32 can be directly connected to the main body part 31, or limited on the main body part 31 by other components.

[0204] In some examples, the main body part 31 and the extension part 32 are integrally formed. In one aspect, the main body part 31 and the extension part 32 do not need to be connected by an additional connection process, simplifying the manufacturing process flow. At the same time, compared with connecting the main body part 31 and the extension part 32 by an additional connection process, the main body part 31 and the extension part 32 in an integrated structure have higher connection firmness.

[0205] The above technical solutions not only improve the consistency between the support component 30 and the electrode assembly 10, but also further improve the fixing effect of the support component 30 on the plurality of first pole pieces 12 and the plurality of second pole pieces 13.

[0206] In some embodiments, the support component 30 is provided with a relief structure for avoiding the first lug 122 and the second lug 132. Exemplarily, the relief structure can be a through hole, and the first lug 122 and the second lug 132 pass through the through hole.

[0207] By providing the relief structure for avoiding the first lug 122 and the second lug 132 on the support component 30, the risk of the support component 30 interfering with the first lug 122 and the second lug 132 to affect the electrical performance of the battery monomer 7 can be reduced.

[0208] FIG. 10 is a top view of another electrode assembly 10 and support component 30 of a battery monomer 7 according to some embodiments of the present application, FIG. 11 is a cross-sectional view of FIG. 10 along D-D, FIG. 12 is a top view of another electrode assembly 10 and support component 30 of a battery monomer 7 according to some embodiments of the present application, and FIG. 13 is a cross-sectional view of FIG. 12 along E-E.

[0209] With reference to FIGS. 10-13, in some embodiments, at least part of the side surface of the support component 30 facing the first side wall 23 protrudes in a direction close to the first side wall 23 to form a first convex surface 40.

[0210] Exemplarily, part of the side surface of the support component 30 facing the first side wall 23 can protrude in a direction close to the first side wall 23 to form the first convex surface 40, or all of the side surface of the support component 30 facing the first side wall 23 can protrude in a direction close to the first side wall 23 to form the first convex surface 40.

[0211] The technical solution above can further improve the supporting effect of the supporting component 30 on the first side wall 23 by introducing the first convex surface 40, thereby further reducing the risk of wrinkles or collapse of the first side wall 23.

[0212] In some embodiments, the first convex surface 40 is a combination of multiple planes, in other words, the first convex surface 40 includes multiple planes connected to each other.

[0213] For example, the first convex surface 40 includes a first plane and a second plane, the first plane and the second plane are arranged along the first direction X, and the first plane and the second plane are both inclined in a direction away from the electrode assembly 10, and the first plane and the second plane intersect.

[0214] The technical solution above can reduce the difficulty of manufacturing the first convex surface 40, simplify the manufacturing process, and reduce the overall manufacturing cost of the supporting component 30 by arranging the first convex surface 40 as a combination of planes.

[0215] In some embodiments, the first convex surface 40 is a curved surface. During the manufacturing process of the battery cell 7, the first side wall 23 can be smoothly extended, thereby further reducing the risk of wrinkles or collapse of the first side wall 23.

[0216] In some examples, the first convex surface 40 is a circular arc surface.

[0217] FIG. 14 is a top view structural schematic diagram of the cooperation between the electrode assembly 10 and the supporting component 30 of another battery cell 7 provided in some embodiments of the present application.

[0218] Continuing to refer to FIG. 14, in some embodiments, the supporting component 30 includes adjacent first and second edge portions 33 and 34, the first edge portion 33 is connected to the second edge portion 34, and a rounded corner 35 is arranged between the side edge of the first edge portion 33 away from the electrode assembly 10 and the side edge of the second edge portion 34 away from the electrode assembly 10.

[0219] For example, the electrode assembly 10 and the shell 20 are substantially cuboids, in other words, the projection of the electrode assembly 10 and the shell 20 along the first direction X is substantially rectangular. The first and second edge portions 33 and 34 extend along two adjacent edge portions of the electrode assembly 10 respectively, and the rounded corner 35 is arranged at the top corner of the electrode assembly 10.

[0220] In some examples, the supporting component 30 can be arranged in multiple, the multiple supporting components 30 are arranged at intervals along the outer periphery of the electrode assembly 10, and each supporting component 30 includes one first edge portion 33 and one second edge portion 34. For example, the supporting component 30 is arranged in four, and the four supporting components 30 are arranged at the four top corners of the electrode assembly 10 respectively.

[0221] In some examples, the support member 30 is provided as one, and the support member 30 is provided around the outer periphery of the electrode assembly 10, the support member 30 comprises two first side portions 33 and two second side portions 34, the two first side portions 33 are oppositely provided, and the two second side portions 34 are oppositely provided.

[0222] It can be understood that, in the manufacturing process of the battery monomer 7, after the inside of the shell 20 is vacuumized, the shell 20 has a greater risk of being wrinkled or collapsed at the top corners of the electrode assembly 10 than other areas.

[0223] Therefore, the above technical solution can further reduce the risk of the first side wall 23 being wrinkled or collapsed by providing the fillet 35 between the side edge of the first side portion 33 of the support member 30 away from the electrode assembly 10 and the side edge of the second side portion 34 away from the electrode assembly 10. In addition, the provision of the fillet 35 can also reduce the risk of the support member 30 piercing the shell 20, thereby further improving the reliability of the battery monomer 7.

[0224] FIG. 15 is an exploded structural schematic view of another battery monomer 7 provided by some embodiments of the present application, FIG. 16 is a top structural schematic view of the battery monomer 7 shown in FIG. 15, and FIG. 17 is a sectional structural schematic view of FIG. 16 along F-F.

[0225] With reference to FIGS. 15 to 17, in some embodiments, the shell 20 comprises a first shell portion 20a and a second shell portion 20b, and the first shell portion 20a and the second shell portion 20b are overlapped with each other along the first direction X. The first shell portion 20a comprises a first end wall 21 and a first side wall 23, and the first end wall 21 and the first side wall 23 define a first cavity 25. The second shell portion 20b comprises a second end wall 22 and a second side wall 24, the second side wall 24 is connected to the second end wall 22 and is provided around the electrode assembly 10, at least part of the second side wall 24 is inclined away from the electrode assembly 10, the support member 30 is at least partially attached to the second side wall 24, and the second end wall 22 and the second side wall 24 define a second cavity 26, the first cavity 25 and the second cavity 26 cooperate to form a containing cavity for containing the electrode assembly 10.

[0226] For example, the second side wall 24 can be detachably connected to the second end wall 22, or can be integrally provided on the second end wall 22, and the second side wall 24 can be directly connected to the second end wall 22 or can be limited on the second end wall 22 by other components.

[0227] The second side wall 24 is used to connect the first side wall 23. For example, the second side wall 24 can be directly connected to the first side wall 23, or can be limited on the first side wall 23 by other components.

[0228] In some examples, the first end wall 21 and the second end wall 22 are both plate-shaped structures, the first side wall 23 is integrally formed with the first end wall 21, the second side wall 24 is integrally formed with the second end wall 22, the first end wall 21 and the first side wall 23 define a first cavity 25, the second end wall 22 and the second side wall 24 define a second cavity 26, and the first cavity 25 and the second cavity 26 cooperate to form a receiving cavity for receiving the electrode assembly 10. During the manufacturing process of the battery cell 7, the electrode assembly 10 is first placed in one of the first cavity 25 and the second cavity 26, and then the first side wall 23 and the second side wall 24 are connected to close the receiving cavity.

[0229] The support member 30 at least partially abuts the second side wall 24. It can be understood that the entire support member 30 abuts a portion of the second side wall 24, or a portion of the support member 30 abuts a portion of the second side wall 24, or a portion of the support member 30 abuts the entire second side wall 24, and the entire support member 30 abuts the entire second side wall 24.

[0230] At least a portion of the second side wall 24 is inclined away from the electrode assembly 10. It should be noted that the second end wall 22 and the second side wall 24 of the shell 20 are formed by stamping, the second end wall 22 and the second side wall 24 surround the second cavity 26, and the second side wall 24 has a certain inclination, in other words, the included angle between the second side wall 24 and the second end wall 22 is obtuse, so as to reduce the risk of breakage of the connection between the second end wall 22 and the second side wall 24 during stamping, and improve the product yield of the shell 20.

[0231] During the manufacturing process of the battery cell 7, after the electrode assembly 10 is installed in the second cavity 26 surrounded by the second end wall 22 and the second side wall 24, a gap exists between the electrode assembly 10 and the second side wall 24. After the shell 20 is processed, for example, the inside of the shell 20 is vacuumed, the shell 20 is prone to wrinkles and collapse, and the wrinkled and collapsed shell 20 will generate a certain pressure on the electrode assembly 10, which is prone to damage the electrode assembly 10.

[0232] The above technical solution, on the one hand, forms the first shell part 20a and the second shell part 20b first, and then covers the first shell part 20a and the second shell part 20b with each other to form the shell 20, which is beneficial to improve the overall preparation efficiency of the shell 20; on the other hand, the support member 30 can support the second side wall 24 to reduce the risk of wrinkles or collapse of the second side wall 24 during the manufacturing process of the battery cell 7, and can effectively improve the reliability of the battery cell 7.

[0233] In some embodiments, at least a portion of the side surface of the support member 30 facing the second side wall 24 protrudes in a direction close to the second side wall 24 to form a second convex surface.

[0234] Exemplarily, a part of the side surface of the support member 30 facing the second side wall 24 can be convex in the direction close to the second side wall 24 to form the second convex surface, or the whole of the side surface of the support member 30 facing the second side wall 24 can be convex in the direction close to the second side wall 24 to form the second convex surface.

[0235] The above technical solution can further improve the support effect of the support member 30 on the second side wall 24 by introducing the second convex surface, thereby further reducing the risk of wrinkles or collapse of the second side wall 24.

[0236] In some embodiments, the second convex surface is a combination of multiple planes, in other words, the second convex surface includes multiple planes, and the multiple planes are connected to each other.

[0237] Exemplarily, the second convex surface includes a third plane and a fourth plane, the third plane and the fourth plane are arranged along the first direction X, and the third plane and the fourth plane are both inclined in the direction away from the electrode assembly 10, and the third plane and the fourth plane intersect.

[0238] The above technical solution can reduce the difficulty of manufacturing the second convex surface, simplify the manufacturing process, and reduce the manufacturing cost of the support member 30 as a whole by setting the second convex surface as a combination of planes.

[0239] In some embodiments, the second convex surface is an arc surface. During the manufacturing process of the battery cell 7, the second side wall 24 can be smoothly extended, thereby further reducing the risk of wrinkles or collapse of the second side wall 24.

[0240] In some examples, the second convex surface is a circular arc surface.

[0241] In some embodiments, the first shell part 20a and the second shell part 20b are an integrally formed structure. The manufacturing efficiency of the shell 20 as a whole can be improved.

[0242] In some embodiments, the first shell part 20a and the second shell part 20b are a split structure.

[0243] FIG. 18 is a top view structural schematic diagram of the electrode assembly 10 and the support member 30 of another battery cell 7 provided in some embodiments of the present application, FIG. 19 is a sectional view structural schematic diagram of FIG. 18 along G-G, FIG. 20 is a top view structural schematic diagram of the electrode assembly 10 and the support member 30 of another battery cell 7 provided in some embodiments of the present application, and FIG. 21 is a sectional view structural schematic diagram of FIG. 20 along H-H.

[0244] With reference back to FIGS. 18-21, in some embodiments, the support component 30 includes a first support 36 and a second support 37, the first support 36 and the second support 37 are stacked along the first direction X, the first support 36 is at least partially fitted with the first side wall 23, and the second support 37 is at least partially fitted with the second side wall 24.

[0245] For example, the first support 36 is at least partially fitted with the first side wall 23, which can be understood as that the entire first support 36 is fitted with a part of the first side wall 23, or a part of the first support 36 is fitted with a part of the first side wall 23, or a part of the first support 36 is fitted with the entire first side wall 23, or the entire first support 36 is fitted with the entire first side wall 23.

[0246] The second support 37 is at least partially fitted with the second side wall 24, which can be understood as that the entire second support 37 is fitted with a part of the second side wall 24, or a part of the second support 37 is fitted with a part of the second side wall 24, or a part of the second support 37 is fitted with the entire second side wall 24, or the entire second support 37 is fitted with the entire second side wall 24.

[0247] The structure shape of the first support 36 and the structure shape of the second support 37 can be the same or different. The material of the first support 36 and the material of the second support 37 can be the same or different.

[0248] In some embodiments, the structure shape of the first support 36 and the structure shape of the second support 37 are the same, and the first support 36 and the second support 37 are symmetrically arranged along the first direction X, and the material of the first support 36 and the material of the second support 37 are the same, which is conducive to simplifying the preparation process and reducing the cost.

[0249] The above technical solution can design the first support 36 according to the structure shape of the first side wall 23 and design the second support 37 according to the structure shape of the second side wall 24, thereby improving the design flexibility and assembly convenience of the support component 30, and thereby improving the overall support effect of the support component 30 and improving the production efficiency of the battery monomer 7.

[0250] FIG. 22 is a top view of another electrode assembly 10 and support component 30 of a battery monomer 7 according to some embodiments of the present application, and FIG. 23 is a sectional view of FIG. 21 along K-K.

[0251] With reference back to FIGS. 22-23, in some embodiments, the first support 36 includes a plurality of first sub-components 361, and the plurality of first sub-components 361 are stacked along the first direction X, and each first sub-component 361 is at least partially fitted with the first side wall 23.

[0252] By further subdividing the first support 36 into a plurality of first sub-components 361, the first support 36 can be further improved in terms of the degree of structural shape adaptation to the first side wall 23, thereby facilitating further improvement in the supporting effect of the first support 36 on the first side wall 23. In addition, the design flexibility of the first support 36 can also be improved.

[0253] In some embodiments, the second support 37 comprises a plurality of second sub-components 371 stacked along the first direction X, each second sub-component 371 being at least partially fitted to the second side wall 24.

[0254] By further subdividing the second support 37 into a plurality of second sub-components 371, the second support 37 can be further improved in terms of the degree of structural shape adaptation to the second side wall 24, thereby facilitating further improvement in the supporting effect of the second support 37 on the second side wall 24. In addition, the design flexibility of the second support 37 can also be improved.

[0255] It should be noted that the surfaces of the plurality of first sub-components 361 facing the first side wall 23 are connected to form the surface of the first support 36 facing the first side wall 23. Among them, it can be that the surfaces of each first sub-component 361 facing the first side wall 23 are first processed according to a predetermined structure, and then the plurality of first sub-components 361 are assembled along the first direction X; or it can be that the plurality of first sub-components 361 are first assembled along the first direction X, and then the surface of the whole formed by the plurality of first sub-components 361 facing the first side wall 23 is processed according to a predetermined structure.

[0256] The surfaces of the plurality of second sub-components 371 facing the second side wall 24 are connected to form the surface of the second support 37 facing the first side wall 23. Among them, it can be that the surfaces of each second sub-component 371 facing the second side wall 24 are first processed according to a predetermined structure, and then the plurality of second sub-components 371 are assembled along the first direction X; or it can be that the plurality of second sub-components 371 are first assembled along the first direction X, and then the surface of the whole formed by the plurality of second sub-components 371 facing the second side wall 24 is processed according to a predetermined structure.

[0257] In some embodiments, the electrode assembly 10 comprises a plurality of first tabs 12 and a plurality of second tabs 13, the first tabs 12 and the second tabs 13 are alternately stacked along the first direction X, and the first tabs 12 and the second tabs 13 are opposite in polarity. The first tab 12 comprises a first body region 121 and a first tab lug 122 extending from the first body region 121, and the second tab 13 comprises a second body region 131 and a second tab lug 132 extending from the second body region 131, the projection of the second body region 131 in the first direction X is located within the projection of the first body region 121 in the first direction X, and there is a gap between the first body regions 121 of two adjacent first tabs 12.

[0258] The first sub-component 361 is provided with a first recess, the first recess is recessed relative to the first sub-component 361 towards the side surface of the first tab 12, the first tab 12 is arranged in the first recess, and a part of the first sub-component 361 is arranged in the gap.

[0259] The second sub-component 371 is provided with a second recess, the second recess is recessed relative to the second sub-component 371 towards the side surface of the first tab 12, the first tab 12 is arranged in the second recess, and a part of the second sub-component 371 is arranged in the gap.

[0260] The above technical solution can improve the stability between the support component 30 and the electrode assembly 10.

[0261] In some examples, the part of the first sub-component 361 arranged in the gap and the part of the second sub-component 371 arranged in the gap jointly constitute the extension 32 of the support component 30. The part of the first sub-component 361 arranged along the outer periphery of the first tab 12 and the part of the second sub-component 371 arranged along the outer periphery of the first tab 12 jointly constitute the body 31 of the support component 30.

[0262] FIG. 24 is an exploded structural schematic diagram of another shell 20 of a battery cell 7 provided in some embodiments of the application.

[0263] With continued reference to FIG. 24, in some embodiments, the shell 20 further comprises a first connecting wall 27 connected to the side of the first side wall 23 away from the electrode assembly 10, and the first connecting wall 27 is connected with the second end wall 22.

[0264] Exemplarily, the first side wall 23, the first end wall 21 and the first connecting wall 27 are integrally formed, the first side wall 23 and the first end wall 21 jointly define a receiving cavity for accommodating the electrode assembly 10 and an opening opposite to the first end wall 21, the first connecting wall 27 is connected to a side of the first side wall 23 away from the receiving cavity and extends in a direction away from the receiving cavity, and the first connecting wall 27 is used to be connected to the second end wall 22. In the manufacturing process of the battery monomer 7, the electrode assembly 10 is first placed in the receiving cavity, and then the second end wall 22 is covered on the opening and connected to the first connecting wall 27 to close the receiving cavity. Wherein, after the battery monomer 7 is formed, the first connecting wall 27 is connected to a side of the first side wall 23 away from the receiving cavity and extends in a direction away from the receiving cavity, which can also be described as, the first connecting wall 27 is connected to a side of the first side wall 23 away from the electrode assembly 10 and extends in a direction away from the electrode assembly 10.

[0265] The first connecting wall 27 can be directly connected to the second end wall 22, or can be limited on the second end wall 22 through other components.

[0266] In some examples, the first connecting wall 27 is a plate-shaped structure.

[0267] The above technical solution can improve the contact area between the first connecting wall 27 and the second end wall 22 by introducing the first connecting wall 27, thereby improving the structural stability of the shell 20 and further improving the reliability of the battery monomer 7.

[0268] FIG. 25 is an exploded structural schematic diagram of another shell 20 of a battery monomer 7 provided by some embodiments of the present application.

[0269] With continuous reference to FIG. 25, in some embodiments, the shell 20 further includes a second connecting wall 28, the second connecting wall 28 is connected to a side of the second side wall 24 away from the electrode assembly 10, and the second connecting wall 28 is connected to the first connecting wall 27.

[0270] Exemplarily, the first side wall 23, the first end wall 21 and the first connecting wall 27 are integrally formed, the first end wall 21 and the first side wall 23 define a first cavity 25, and the first connecting wall 27 is connected to a side of the first side wall 23 away from the first cavity 25 and extends in a direction away from the first cavity 25. The second side wall 24, the second end wall 22 and the second connecting wall 28 are integrally formed, the second end wall 22 and the second side wall 24 define a second cavity 26, and the second connecting wall 28 is connected to a side of the second side wall 24 away from the second cavity 26 and extends in a direction away from the second cavity 26. The first cavity 25 and the second cavity 26 cooperate to form a receiving cavity for accommodating the electrode assembly 10.

[0271] In the manufacturing process of the battery cell 7, the electrode assembly 10 is first placed in one of the first cavity 25 and the second cavity 26, and then the second connecting wall 28 is connected with the first connecting wall 27 to close the accommodation cavity. In this case, after the battery cell 7 is formed, the first connecting wall 27 is connected to the first side wall 23 on the side away from the first cavity 25, and extends in the direction away from the first cavity 25. Alternatively, the first connecting wall 27 is connected to the first side wall 23 on the side away from the electrode assembly 10, and extends in the direction away from the electrode assembly 10. The second connecting wall 28 is connected to the second side wall 24 on the side away from the second cavity 26, and extends in the direction away from the second cavity 26. Alternatively, the second connecting wall 28 is connected to the second side wall 24 on the side away from the electrode assembly 10, and extends in the direction away from the electrode assembly 10.

[0272] FIG. 26 is a top view of another battery cell 7 according to some embodiments of the present application;

[0273] With reference to FIG. 26, in some embodiments, the housing 20 includes a first housing part 20a and a second housing part 20b, which are integrally formed and cover each other in the first direction X. The first housing part 20a includes the first end wall 21, the first side wall 23, and the first connecting wall 27, and the second housing part 20b includes the second end wall 22, the second side wall 24, and the second connecting wall 28.

[0274] For example, the first housing part 20a and the second housing part 20b are integrally formed by stamping on a substrate.

[0275] Based on the battery cell 7 according to the embodiments of the present application, a manufacturing method of the battery cell 7 is also provided. FIG. 27 is a process flow diagram of another manufacturing method of the battery cell 7 according to some embodiments of the present application. With reference to FIG. 27, the manufacturing method of the battery cell 7 can include steps 01, 02, and 03.

[0276] Step 01, providing the housing 20;

[0277] Step 02, providing the electrode assembly 10 and the support member 30, and installing the electrode assembly 10 and the support member 30 in the housing 20, wherein the electrode assembly 10 has a gap between the outer periphery and the inner wall of the housing 20, and the support member 30 is arranged between the electrode assembly 10 and the inner wall of the housing 20 and used to fill the gap;

[0278] Step 03, encapsulating the housing 20.

[0279] The above steps are described in detail as follows.

[0280] Firstly, in relation to the above step 01, the shell 20 is a component for forming an internal environment of the battery cell 7, wherein the formed internal environment can be used to accommodate the electrode assembly 10, the electrolyte or other components.

[0281] Next, in relation to the above step 02, the support component 30 can be first installed on the electrode assembly 10, and then the electrode assembly 10 with the support component 30 installed is installed in the shell 20; or the support component 30 can be first installed in the shell 20, and then the electrode assembly 10 is installed in the shell 20; or the electrode assembly 10 can be first installed in the shell 20, and then the support component 30 is installed in the shell 20.

[0282] Next, in relation to the above step 03, the purpose of packaging the shell 20 is to close the shell 20 to provide a closed internal environment for the operation of the electrode assembly.

[0283] It can be understood that, during the forming of the shell 20, the internal space of the shell 20 is usually slightly larger than the volume of the electrode assembly 10, so as to facilitate the assembly of the electrode assembly 10 and improve the preparation yield of the shell 20, so that after the electrode assembly 10 is installed in the shell 20, there is a gap between the outer periphery of the electrode assembly 10 and the inner wall of the shell 20 at least in part. Due to the existence of the gap, the shell 20 is prone to wrinkles and collapse after being packaged, and the wrinkled and collapsed shell 20 will generate a certain pressure on the electrode assembly 10, which is easy to cause damage to the electrode assembly 10.

[0284] Thus, the above technical solution sets the support component 30, which can support the inner wall of the shell 20 to reduce the risk of wrinkles or collapse of the shell 20 during the manufacturing process of the battery cell 7, and can effectively improve the reliability of the battery cell 7.

[0285] In some embodiments, the shell 20 includes a first end wall 21, a second end wall 22 and a first side wall 23, the first end wall 21 and the second end wall 22 are oppositely arranged along the first direction X, the electrode assembly 10 is accommodated in the shell 20 and located between the first end wall 21 and the second end wall 22, the first side wall 23 is connected to the first end wall 21 and arranged around the electrode assembly 10, at least part of the first side wall 23 is inclined away from the electrode assembly 10. The support component 30 is accommodated in the shell 20 and arranged along the outer periphery of the electrode assembly 10, and the support component 30 is at least partially attached to the first side wall 23.

[0286] Exemplarily, the shell 20 can be formed by stamping the first end wall 21 and the first side wall 23, the first end wall 21 and the first side wall 23 surrounding the first cavity 25, and the first side wall 23 having a certain slope, in other words, the included angle between the first side wall 23 and the first end wall 21 being obtuse, so as to reduce the risk of breakage of the joint between the first end wall 21 and the first side wall 23 in the stamping process and improve the product yield of the shell 20. The first side wall 23 can be directly connected to the second end wall 22 or be limited on the second end wall 22 by other components. Exemplarily, the first side wall 23 can be bonded to the second end wall 22 or be connected to the second end wall 22 by a heat sealing method.

[0287] The support component 30 can support the first side wall 23, so as to reduce the risk of wrinkles or collapse of the first side wall 23 in the manufacturing process of the battery monomer 7 and effectively improve the reliability of the battery monomer 7.

[0288] In some embodiments, the step 02 of providing the electrode assembly 10 and the support component 30 and installing the electrode assembly 10 and the support component 30 in the shell 20 comprises:

[0289] providing the electrode assembly 10;

[0290] providing the support component 30 and arranging the support component 30 on the electrode assembly 10;

[0291] installing the electrode assembly 10 provided with the support component 30 in the shell 20.

[0292] The above technical solution first arranges the support component 30 on the electrode assembly 10 and then installs the electrode assembly 10 provided with the support component 30 in the shell 20, which can reduce the influence of the electrode assembly 10 and the support component 30 on the shell 20 in the installation process, reduce the risk of damage to the shell 20 and improve the product yield.

[0293] In some embodiments, the step of providing the support component 30 and arranging the support component 30 on the electrode assembly 10 comprises:

[0294] applying glue on a preset position of the electrode assembly 10 to form the support component 30.

[0295] Exemplarily, the preset position of the electrode assembly 10 can be a part of the outer periphery of the electrode assembly 10 or the entire outer periphery of the electrode assembly 10. The glue can be applied manually by an operator or by using a glue applying device.

[0296] The technical solution above forms the support component 30 on the electrode assembly 10 by means of gluing, which can reduce the risk of damage to the electrode assembly 10 due to interference between the electrode assembly 10 and the support component 30 during installation. In addition, the gluing process is simple, which is conducive to reducing the overall production cost of the battery monomer 7.

[0297] In some embodiments, the step of providing the support component 30 and arranging the support component 30 on the electrode assembly 10 includes:

[0298] providing a mold, and placing the electrode assembly 10 in the mold, wherein the mold is used to prepare the support component 30;

[0299] gluing into the mold to form the support component 30 at a predetermined position of the electrode assembly 10;

[0300] taking out the electrode assembly 10 provided with the support component 30 from the mold.

[0301] Exemplarily, the mold includes a placement cavity for accommodating the electrode assembly 10 and a forming cavity arranged along the outer periphery of the placement cavity and used for forming the support component 30. An inlet is also provided on the mold, which is communicated with the forming cavity and the external environment, and the preparation material required for preparing the support component 30 can enter the forming cavity through the inlet.

[0302] The technical solution above can effectively improve the forming precision of the support component 30.

[0303] In some embodiments, the step 01 of providing the shell 20 includes:

[0304] providing a first shell part 20a and a second shell part 20b, wherein the first shell part 20a includes a first end wall 21 and a first side wall 23, the first end wall 21 and the first side wall 23 defining a first cavity 25, and the second shell part 20b includes a second end wall 22 and a second side wall 24, the second side wall 24 being connected to the second end wall 22, the second end wall 22 and the second side wall 24 defining a second cavity 26, at least part of the second side wall 24 being outwardly inclined;

[0305] The step 02 of providing the electrode assembly 10 and the support component 30 and installing the electrode assembly 10 and the support component 30 in the shell 20 includes:

[0306] providing the electrode assembly 10 and the support component 30, and installing the electrode assembly 10 and the support component 30 in at least one of the first cavity 25 and the second cavity 26;

[0307] The first shell part 20a and the second shell part 20b are overlapped with each other to make the first cavity 25 and the second cavity 26 cooperate to form a containing cavity for containing the electrode assembly 10, wherein the support part 30 is at least partially attached to the second side wall 24;

[0308] The packaging shell 20 of the above step 03 comprises:

[0309] The first side wall 23 and the second side wall 24 are connected to close the containing cavity.

[0310] Exemplarily, the first shell part 20a and the second shell part 20b can be integrally formed, or can be separately formed.

[0311] The electrode assembly 10 and the support part 30 are installed in at least one of the first cavity 25 and the second cavity 26, which can be understood as that the electrode assembly 10 and the support part 30 are respectively installed in the first cavity 25 and the second cavity 26, or the electrode assembly 10 and the support part 30 are both installed in the first cavity 25, or the electrode assembly 10 and the support part 30 are both installed in the second cavity 26.

[0312] In some examples, the electrode assembly 10 and the support part 30 are respectively installed in the first cavity 25 and the second cavity 26. It can be that the electrode assembly 10 is first installed in the first cavity 25, and then the support part 30 is installed in the second cavity 26; or it can be that the support part 30 is first installed in the second cavity 26, and then the electrode assembly 10 is installed in the first cavity 25; or it can be that the electrode assembly 10 and the support part 30 are simultaneously installed in the first cavity 25 and the second cavity 26, respectively.

[0313] In some examples, the electrode assembly 10 and the support part 30 are both installed in the first cavity 25. It can be that the electrode assembly 10 is first installed in the first cavity 25, and then the support part 30 is installed in the second cavity 26; or it can be that the support part 30 is first installed in the first cavity 25, and then the electrode assembly 10 is installed in the first cavity 25; or it can be that the support part 30 is first installed on the electrode assembly 10, and then the electrode assembly 10 provided with the support part 30 is installed in the first cavity 25.

[0314] Optionally, the first side wall 23 and the second side wall 24 can be connected by adhesion, or can be connected by heat sealing, or can be connected by riveting.

[0315] The technical solution has the advantages that the first shell part 20a and the second shell part 20b are formed first, and then the first shell part 20a and the second shell part 20b are overlapped with each other to form the shell 20, thereby facilitating improvement of the manufacturing efficiency of the shell 20 as a whole. In addition, the support part 30 can support the second side wall 24, thereby reducing the risk of wrinkles or collapse of the second side wall 24 in the manufacturing process of the battery monomer 7, and effectively improving the reliability of the battery monomer 7.

[0316] In some embodiments, the step of providing the electrode assembly 10 and the support part 30, and installing the electrode assembly 10 and the support part 30 in at least one of the first cavity 25 and the second cavity 26 comprises:

[0317] providing the electrode assembly 10;

[0318] providing the first support 36 and the second support 37, and installing the first support 36 and the second support 37 in the first cavity 25 and the second cavity 26, respectively, wherein the first support 36 is at least partially attached to the first side wall 23, and the second support 37 is at least partially attached to the second side wall 24;

[0319] installing the electrode assembly 10 in one of the first cavity 25 and the second cavity 26.

[0320] For example, the first support 36 can be installed in the first cavity 25 first, and then the second support 37 can be installed in the second cavity 26; or the second support 37 can be installed in the second cavity 26 first, and then the first support 36 can be installed in the first cavity 25; or the first support 36 and the second support 37 can be installed in the first cavity 25 and the second cavity 26, respectively, at the same time.

[0321] On the one hand, the first support 36 and the second support 37 are installed in the first cavity 25 and the second cavity 26, respectively, and then the electrode assembly 10 is installed in one of the first cavity 25 and the second cavity 26, thereby reducing the influence of the electrode assembly 10, the first support 36 and the second support 37 on the electrode assembly 10 during installation, reducing the risk of the electrode assembly 10 of the shell 20, and improving the product yield. On the other hand, the first support 36 can be designed according to the structure and shape of the first side wall 23, and the second support 37 can be designed according to the structure and shape of the second side wall 24, thereby improving the design flexibility and assembly convenience of the support part 30, thereby facilitating improvement of the overall support effect of the support part 30 and the production efficiency of the battery monomer 7.

[0322] In some embodiments, the step of providing the first support 36 and the second support 37, and installing the first support 36 and the second support 37 in the first cavity 25 and the second cavity 26, respectively, comprises:

[0323] The first support 36 and the second support 37 are formed by gluing at the preset positions of the first cavity 25 and the second cavity 26.

[0324] For example, the preset position of the first cavity 25 can be a part of the outer periphery of the first cavity 25, or the entire outer periphery of the first cavity 25. The preset position of the second cavity 26 can be a part of the outer periphery of the second cavity 26, or the entire outer periphery of the second cavity 26. The gluing can be performed manually by an operator, or by using a gluing device.

[0325] The above technical solution forms the first support 36 and the second support 37 at the preset positions of the first cavity 25 and the second cavity 26 by gluing, which can reduce the risk of damage to the shell 20. In addition, the gluing process is simple, which is conducive to reducing the overall production cost of the battery monomer 7.

[0326] In some embodiments, the above steps of providing the electrode assembly 10 and the support component 30, and installing the electrode assembly 10 and the support component 30 in the shell 20 include:

[0327] providing the electrode assembly 10;

[0328] providing the first support 36 and the second support 37, and installing the first support 36 and the second support 37 on the electrode assembly 10 in the first direction X;

[0329] installing the electrode assembly 10 provided with the first support 36 and the second support 37 in one of the first cavity 25 and the second cavity 26;

[0330] wherein the first support 36 at least partially fits the first side wall 23, and the second support 37 at least partially fits the second side wall 24.

[0331] For example, the first support 36 can be installed on the electrode assembly 10 first, and then the second support 37 is installed on the electrode assembly 10. Alternatively, the second support 37 can be installed on the electrode assembly 10 first, and then the first support 36 is installed on the electrode assembly 10. Alternatively, the first support 36 and the second support 37 can be installed on the electrode assembly 10 at the same time.

[0332] On one hand, the first support member 36 and the second support member 37 are arranged on the electrode assembly 10 first, and then the electrode assembly 10 provided with the first support member 36 and the second support member 37 is installed in the shell 20, which can reduce the influence of the electrode assembly 10, the first support member 36 and the second support member 37 on the shell 20 during installation, reduce the risk of damage to the shell 20, and improve product yield. On the other hand, the first support member 36 can be designed according to the structure and shape of the first side wall 23, and the second support member 37 can be designed according to the structure and shape of the second side wall 24, thereby improving the design flexibility and assembly convenience of the support member 30, thereby facilitating to improve the overall support effect of the support member 30 and the production efficiency of the battery monomer 7.

[0333] In some embodiments, the above step of providing the first support member 36 and the second support member 37 and installing the first support member 36 and the second support member 37 on the electrode assembly 10 comprises:

[0334] providing a plurality of first sub-components 361, and sequentially installing the plurality of first sub-components 361 on the electrode assembly 10, wherein the plurality of first sub-components 361 are stacked along the first direction X;

[0335] providing a plurality of second sub-components 371, and sequentially installing the plurality of second sub-components 371 on the electrode assembly 10, wherein the plurality of second sub-components 371 are stacked along the first direction X;

[0336] wherein each first sub-component 361 at least partially fits the first side wall 23, and each second sub-component 371 at least partially fits the second side wall 24.

[0337] Exemplarily, the plurality of first sub-components 361 can be sequentially stacked and installed on the electrode assembly 10 from low to high, and the plurality of first sub-components 361 can also be sequentially stacked to form the first support member 36 from low to high first, and then the first support member 36 is installed on the electrode assembly 10. The plurality of second sub-components 371 can be sequentially stacked and installed on the electrode assembly 10 from low to high, and the plurality of second sub-components 371 can also be sequentially stacked to form the second support member 37 from low to high first, and then the second support member 37 is installed on the electrode assembly 10.

[0338] In some examples, the plurality of first sub-components 361 can be sequentially stacked and installed on the electrode assembly 10 from low to high, and the plurality of second sub-components 371 can be sequentially stacked and installed on the electrode assembly 10 from low to high based on the plurality of first sub-components 361.

[0339] The technical solution has the advantages that: by further subdividing the first support member 36 into a plurality of first sub-components 361, the first support member 36 can be further improved in the degree of adaptation to the structural shape of the first side wall 23, thereby facilitating further improvement in the supporting effect of the first support member 36 on the first side wall 23. In addition, the design flexibility of the first support member 36 can also be improved. By further subdividing the second support member 37 into a plurality of second sub-components 371, the second support member 37 can be further improved in the degree of adaptation to the structural shape of the second side wall 24, thereby facilitating further improvement in the supporting effect of the second support member 37 on the second side wall 24. In addition, the design flexibility of the second support member 37 can also be improved.

[0340] In some embodiments, the above step of providing the electrode assembly 10 comprises:

[0341] providing a first number of first pole pieces 12 and a first number of second pole pieces 13;

[0342] providing a second number of first pole pieces 12 and a second number of second pole pieces 13;

[0343] wherein the first pole pieces 12 and the second pole pieces 13 have opposite polarities;

[0344] The above step of providing a plurality of first sub-components 361 and sequentially mounting the plurality of first sub-components 361 to the electrode assembly 10 comprises:

[0345] providing a first number of first sub-components 361;

[0346] assembling the first number of first pole pieces 12, the first number of second pole pieces 13, and the first number of first sub-components 361 to obtain a first assembly component, wherein the first assembly component comprises a first number of first assembly members stacked along the first direction X, and in each first assembly member, the first pole pieces 12 and the second pole pieces 13 are arranged in a stacked manner along the first direction X, and the first sub-components 361 are connected to at least one of the first pole pieces 12 and the second pole pieces 13;

[0347] The above step of providing a plurality of second sub-components 371 and sequentially mounting the plurality of second sub-components 371 to the electrode assembly 10 comprises:

[0348] providing a second number of second sub-components 371;

[0349] assembling the second number of first pole pieces 12, the second number of second pole pieces 13, and the second number of second sub-components 371 to obtain a second assembly component, wherein the second assembly component comprises a second number of second assembly members, and in each second assembly member, the first pole pieces 12 and the second pole pieces 13 are arranged in a stacked manner along the first direction X, and the second sub-components 371 are connected to at least one of the first pole pieces 12 and the second pole pieces 13;

[0350] The second assembly component is stacked with the first assembly component along the first direction X.

[0351] Exemplarily, the first pole piece 12 and the second pole piece 13 are opposite in polarity, one of the first pole piece 12 and the second pole piece 13 is a positive pole piece, and the other is a negative pole piece; one of the first pole piece 12 and the second pole piece 13 is a negative pole piece, and the other is a positive pole piece. As an example, the first pole piece 12 is a negative pole piece, and the second pole piece 13 is a positive pole piece.

[0352] In some examples, a first assembly component is assembled by assembling a first number of the first pole pieces 12, a first number of the second pole pieces 13 and a first number of the first sub-components 361, a second assembly component is assembled by assembling a second number of the second pole pieces 13, a second number of the second pole pieces 13 and a second number of the second sub-components 371, and the first assembly component and the second assembly component are stacked along the first direction X to obtain the support component 30.

[0353] In some examples, a second assembly component is assembled by assembling a second number of the second pole pieces 13, a second number of the second pole pieces 13 and a second number of the second sub-components 371, a first assembly component is assembled by assembling a first number of the first pole pieces 12, a first number of the second pole pieces 13 and a first number of the first sub-components 361, and the first assembly component and the second assembly component are stacked along the first direction X to obtain the support component 30.

[0354] In some examples, a first assembly component is assembled by assembling a first number of the first pole pieces 12, a first number of the second pole pieces 13 and a first number of the first sub-components 361, and a second assembly component is assembled on the basis of the first assembly component by assembling a second number of the second pole pieces 13, a second number of the second pole pieces 13 and a second number of the second sub-components 371, that is, the second assembly component is obtained at the same time that the support component 30 is formed.

[0355] Exemplarily, a first assembly component is assembled by assembling a first number of the first pole pieces 12, a first number of the second pole pieces 13 and a first number of the first sub-components 361, specifically, one first pole piece 12 is provided first, then one second pole piece 13 is provided, the second pole piece 13 is stacked on the first pole piece 12 to obtain a first stack group, then one first sub-component 361 is provided, and the first sub-component 361 is arranged on the first stack group to obtain a first assembly component. The above steps are repeated for a first number of times to obtain a first number of first assembly components, and the first number of first assembly components are stacked along the first direction X to form a first assembly component group. The first number of first sub-components 361 stacked along the first direction X constitute the first support 36.

[0356] The first number of first assembly components can be formed sequentially from low to high along the first direction X.

[0357] As an example, each first assembly component includes a first electrode 12, a second electrode 13, and a first sub-component 361. The first electrode 12 and the second electrode 13 are stacked along a first direction X. The first sub-component 361 may be connected to the first electrode 12, or it may be connected to the second electrode 13. The first sub-component 361 may also be connected to both the first electrode 12 and the second electrode 13.

[0358] For example, a second assembly is obtained by assembling a second number of first electrode plates 12, a second number of second electrode plates 13, and a second number of second sub-components 371. Specifically, a first electrode plate 12 is provided first, followed by a second electrode plate 13. The second electrode plate 13 is stacked on top of the first electrode plate 12 to obtain a second stack. Then, a second sub-component 371 is provided and disposed on the second stack to obtain a second assembly. By repeating the above steps a second number of times, a second number of second assembly components are obtained. The second number of second assembly components are stacked along the first direction X to form a second assembly assembly. The second number of second sub-components 371 stacked along the first direction X constitute a second support member 37.

[0359] The second number of second assembly components can be formed sequentially from low to high along the first direction X. Further, the second number of second assembly components can be formed sequentially from low to high along the first direction X based on the first assembly component.

[0360] As an example, each second assembly component includes a first electrode 12, a second electrode 13, and a second sub-component 371. The first electrode 12 and the second electrode 13 are stacked along a first direction X. The second sub-component 371 may be connected to the first electrode 12, or it may be connected to the second electrode 13. Alternatively, the second sub-component 371 may be connected to both the first electrode 12 and the second electrode 13.

[0361] It should be noted that the first quantity and the second quantity can be the same or different. As an example, the first quantity can be, but is not limited to, one, two, three, four or more, and the second quantity can be, but is not limited to, one, two, three, four or more.

[0362] In some examples, the first quantity and the second quantity are the same.

[0363] The above technical solution improves the assembly accuracy between the support component 30 and the electrode assembly 10 by assembling the first sub-component 361 and the electrode 11 layer by layer and assembling the second sub-component 371 and the electrode 11 layer by layer.

[0364] It can be understood that the manufacturing method of the battery cell 7 provided in the embodiments of the present application can be used to realize the battery cell 7 provided in any of the embodiments of the present application. The specific details of the battery cell 7 realized by each step of the manufacturing method of the battery cell 7 can be referred to the description of the corresponding part of the battery cell 7 provided in the embodiments of the present application. For the sake of brevity, the description is not repeated here.

[0365] In addition, the corresponding structural features in the battery cell 7 provided in any of the embodiments of the present application can be made by using the same or similar preparation methods mentioned in the embodiments of the present application. For the sake of brevity, the description is not repeated here.

[0366] According to some embodiments of the present application, the present application further provides a battery comprising the battery cell 7 of any of the above-mentioned schemes.

[0367] According to some embodiments of the present application, the present application further provides a battery comprising the battery cell 7 of any of the above-mentioned schemes.

[0368] In order to better understand the battery cell 7 provided in the embodiments of the present application, based on the same inventive concept, the embodiments of the above-mentioned battery cell 7 in practical application are provided for description.

[0369] The embodiments of the present application provide a battery cell 7, which comprises an electrode assembly 10, a shell 20 and a support component 30. The shell 20 comprises a first shell part 20a and a second shell part 20b, and the first shell part 20a and the second shell part 20b are overlapped with each other along a first direction X. The first shell part 20a comprises a first end wall 21 and a first side wall 23, and the first end wall 21 and the first side wall 23 define a first cavity 25. The second shell part 20b comprises a second end wall 22 and a second side wall 24, and the second end wall 22 and the second side wall 24 define a second cavity 26. The first cavity 25 and the second cavity 26 cooperate to form a receiving cavity for accommodating the electrode assembly 10.

[0370] The electrode assembly 10 is accommodated in the shell 20 and located between the first end wall 21 and the second end wall 22. The first side wall 23 is connected to the first end wall 21 and arranged around the electrode assembly 10, and at least part of the first side wall 23 is inclined away from the electrode assembly 10. The second side wall 24 is connected to the second end wall 22 and arranged around the electrode assembly 10, and at least part of the second side wall 24 is inclined away from the electrode assembly 10.

[0371] The support component 30 is accommodated in the shell 20 and arranged along the outer periphery of the electrode assembly 10. The support component 30 is at least partially attached to the first side wall 23, and the support component 30 is at least partially attached to the second side wall 24.

[0372] The support component 30 can support the first side wall 23 and the second side wall 24 to reduce the risk of the first side wall 23 and the second side wall 24 being wrinkled or collapsed during the manufacturing process of the battery cell 7, and effectively improve the reliability of the battery cell 7.

[0373] The embodiment of the present application provides another manufacturing method of a battery cell 7. The manufacturing method of the battery cell 7 can include:

[0374] The first shell part 20a includes the first end wall 21 and the first side wall 23, and the first end wall 21 and the first side wall 23 define the first cavity 25. The second shell part 20b includes the second end wall 22 and the second side wall 24, and the second side wall 24 is connected to the second end wall 22. The second end wall 22 and the second side wall 24 define the second cavity 26. At least part of the first side wall 23 is outwardly inclined. At least part of the second side wall 24 is outwardly inclined.

[0375] The electrode assembly 10 and the support component 30 are provided, and the electrode assembly 10 and the support component 30 are installed in at least one of the first cavity 25 and the second cavity 26.

[0376] The first shell part 20a and the second shell part 20b are overlapped with each other to cooperate the first cavity 25 and the second cavity 26 to form a containing cavity for containing the electrode assembly 10. The first end wall 21 and the second end wall 22 are oppositely arranged along the first direction X. The electrode assembly 10 is located between the first end wall 21 and the second end wall 22. The support component 30 is at least partially attached to the first side wall 23. The support component 30 is at least partially attached to the second side wall 24.

[0377] The first side wall 23 and the second side wall 24 are connected to close the containing cavity.

[0378] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0379] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, comprising: an electrode assembly; a housing for accommodating the electrode assembly, a gap being defined between an outer periphery of the electrode assembly and an inner wall of the housing; and a support member arranged between the electrode assembly and the inner wall of the housing and configured to fill the gap. The housing comprises a first end wall, a second end wall and a first side wall, the first end wall and the second end wall are oppositely arranged along a first direction, the electrode assembly is accommodated in the housing and located between the first end wall and the second end wall, the first side wall is connected to the first end wall and arranged around the electrode assembly, at least a portion of the first side wall is inclined away from the electrode assembly. The support member is arranged along an outer periphery of the electrode assembly, and the support member is at least partially attached to the first side wall. The electrode assembly comprises a plurality of electrode sheets stacked along the first direction.

2. The battery cell of claim 1, wherein, The support member surrounds an outer periphery of the electrode assembly, and an axis of the support member is parallel to the first direction. The electrode assembly comprises a plurality of first electrode sheets and a plurality of second electrode sheets, the first electrode sheets and the second electrode sheets are alternately arranged and stacked along the first direction, and polarities of the first electrode sheets and the second electrode sheets are opposite.

3. The battery cell of claim 2, wherein, The first electrode sheet comprises a first main body region and a first tab extending from the first main body region, the second electrode sheet comprises a second main body region and a second tab extending from the second main body region, a projection of the second main body region in the first direction is located within a projection of the first main body region in the first direction, and a gap is defined between the first main body regions of two adjacent first electrode sheets. The support member comprises a main body portion and an extension portion, the main body portion is arranged along an outer periphery of the electrode assembly, and the extension portion is inserted into the gap.

4. The battery cell of claim 2 or 3, wherein, At least a portion of a side surface of the support member facing the first side wall is convex in a direction close to the first side wall to form a first convex surface. The first convex surface is a combination of a plurality of planes or an arc surface. The support member comprises adjacent first and second edge portions, the first edge portion is connected to the second edge portion, and a rounded corner is defined between a side edge of the first edge portion away from the electrode assembly and a side edge of the second edge portion away from the electrode assembly.

5. The battery cell of any one of claims 2-4, wherein, The housing comprises a first housing portion and a second housing portion, the first housing portion and the second housing portion are overlapped with each other along the first direction.

6. The battery cell of claim 5, wherein, The first housing portion comprises the first end wall and the first side wall, and the first end wall and the first side wall define a first cavity.

7. The battery cell of any one of claims 2-6, wherein, The second housing portion comprises the second end wall and a second side wall, the second side wall is connected to the second end wall and arranged around the electrode assembly, at least a portion of the second side wall is inclined away from the electrode assembly, the support member is at least partially attached to the second side wall, the second end wall and the second side wall define a second cavity, and the first cavity and the second cavity cooperate to form an accommodation cavity for accommodating the electrode assembly.

8. The battery cell of any one of claims 2-7, wherein, ​ ​ ​ 9. The battery cell of claim 8, wherein, The support component comprises a first support and a second support, the first support and the second support are stacked along the first direction, the first support is at least partially attached to the first side wall, and the second support is at least partially attached to the second side wall.

10. The battery cell of claim 9, wherein, The first support comprises a plurality of first sub-components, the plurality of first sub-components are stacked along the first direction, and each of the first sub-components is at least partially attached to the first side wall; and / or, The second support comprises a plurality of second sub-components, the plurality of second sub-components are stacked along the first direction, and each of the second sub-components is at least partially attached to the second side wall.

11. The battery cell of any one of claims 2-10, wherein, The housing further comprises a first connecting wall, the first connecting wall is connected to a side of the first side wall away from the electrode assembly, and the first connecting wall is connected to the second end wall.

12. A method for manufacturing a battery cell, comprising: providing a housing; providing an electrode assembly and a support component, and installing the electrode assembly and the support component in the housing, wherein a gap is formed between an outer periphery of the electrode assembly and an inner wall of the housing, and the support component is arranged between the electrode assembly and the inner wall of the housing and used to fill the gap; encapsulating the housing.

13. The method for manufacturing a battery cell according to claim 12, wherein the step of providing an electrode assembly and a support component, and installing the electrode assembly and the support component in the housing comprises: providing the electrode assembly; providing the support component, and arranging the support component on the electrode assembly; installing the electrode assembly provided with the support component in the housing.

14. The method of manufacturing a battery cell according to claim 13, wherein, the step of providing the support component, and arranging the support component on the electrode assembly comprises: applying glue on a preset position of the electrode assembly to form the support component.

15. The method of manufacturing a battery cell according to claim 13, wherein, the step of providing the support component, and arranging the support component on the electrode assembly comprises: providing a mold, and placing the electrode assembly in the mold, wherein the mold is used to prepare the support component; injecting glue into the mold to form the support component on a preset position of the electrode assembly; taking out the electrode assembly provided with the support component from the mold.

16. The method for manufacturing a battery cell according to claim 12, wherein the step of providing a housing comprises: providing a first housing part and a second housing part, wherein the first housing part comprises a first end wall and a first side wall, the first end wall and the first side wall define a first cavity, the second housing part comprises a second end wall and a second side wall, the second side wall is connected to the second end wall, and the second end wall and the second side wall define a second cavity, and at least part of the second side wall is outwardly inclined; the step of providing an electrode assembly and a support component, and installing the electrode assembly and the support component in the housing comprises: providing an electrode assembly and a support component, and installing the electrode assembly and the support component in at least one of the first cavity and the second cavity. The first shell part and the second shell part are overlapped with each other to make the first cavity and the second cavity cooperate to form a containing cavity for containing the electrode assembly, wherein the support member is at least partially attached to the second side wall; The step of packaging the shell comprises: The first side wall and the second side wall are connected to close the containing cavity.

17. The method of claim 16, wherein The step of providing the electrode assembly and the support member and installing the electrode assembly and the support member in at least one of the first cavity and the second cavity comprises: The electrode assembly is provided; The first support member and the second support member are provided and installed in the first cavity and the second cavity, respectively, wherein the first support member is at least partially attached to the first side wall and the second support member is at least partially attached to the second side wall; The electrode assembly is installed in one of the first cavity and the second cavity.

18. The method of claim 17, wherein The step of providing the first support member and the second support member and installing the first support member and the second support member in the first cavity and the second cavity, respectively, comprises: The first support member and the second support member are formed by gluing at predetermined positions of the first cavity and the second cavity.

19. The method of claim 16, wherein The step of providing the electrode assembly and the support member and installing the electrode assembly and the support member in the shell comprises: The electrode assembly is provided; The first support member and the second support member are provided and installed in the first cavity and the second cavity, respectively, wherein the first support member is at least partially attached to the first side wall and the second support member is at least partially attached to the second side wall.

20. The method of claim 19, wherein The step of providing the first support member and the second support member and installing the first support member and the second support member in the electrode assembly comprises: A plurality of first sub-members are provided and installed in the electrode assembly in sequence, wherein the plurality of first sub-members are stacked in the first direction; A plurality of second sub-members are provided and installed in the electrode assembly in sequence, wherein the plurality of second sub-members are stacked in the first direction; Wherein each of the first sub-members is at least partially attached to the first side wall and each of the second sub-members is at least partially attached to the second side wall.

21. The method of claim 20, wherein The step of providing the electrode assembly comprises: A first number of first pole pieces and a first number of second pole pieces are provided; A second number of first pole pieces and a second number of second pole pieces are provided; ​ ​ The first pole piece and the second pole piece are opposite in polarity. The steps of providing a plurality of first sub-components and sequentially mounting the plurality of first sub-components to the electrode assembly include: providing the first number of the first sub-components; assembling the first number of the first pole pieces, the first number of the second pole pieces, and the first number of the first sub-components to obtain a first assembly component, wherein the first assembly component comprises the first number of first assembly members stacked along the first direction, and in each of the first assembly members, the first pole piece and the second pole piece are stacked along the first direction, and the first sub-component is connected to at least one of the first pole piece and the second pole piece; The steps of providing a plurality of second sub-components and sequentially mounting the plurality of second sub-components to the electrode assembly include: providing the second number of the second sub-components; assembling the second number of the second pole pieces, the second number of the second pole pieces, and the second number of the second sub-components to obtain a second assembly component, wherein the second assembly component comprises the second number of second assembly members, and in each of the second assembly members, the first pole piece and the second pole piece are stacked along the first direction, and the second sub-component is connected to at least one of the first pole piece and the second pole piece; The second assembly component and the first assembly component are stacked along the first direction.

22. A battery comprising a plurality of battery cells according to any one of claims 1-11.

23. An electric device comprising a battery cell according to any one of claims 1-11, wherein the battery cell is configured to provide electric energy.

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