Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly, a supporting part and a binding part, the shell comprises a shell and a first end cover, a first opening is formed in the end part of one side of the shell along a first direction, and the first end cover is connected to the shell and covers the first opening. The electrode assembly is arranged in the shell, the supporting part comprises a first supporting piece and a second supporting piece, the first supporting piece is connected with the second supporting piece, the first supporting piece is arranged between the shell and the electrode assembly, the second supporting piece is arranged between the first end cover and the electrode assembly, and the binding part is at least connected with the first supporting piece and the electrode assembly. According to the invention, the reliability of the battery monomer can be effectively improved.

Description

Technical Field

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

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0003] In the development of battery technology, the reliability of battery cells directly affects the reliability, cost of use, and user experience of end products. Therefore, how to effectively improve the reliability of battery cells is a technical issue that needs continuous improvement in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, which can effectively improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of the present application provide a battery cell, comprising a housing, an electrode assembly, a support component, and a restraining component. The housing comprises a shell and a first end cap, wherein the shell has a first opening at one end thereof along a first direction, and the first end cap is connected to the shell and covers the first opening. The electrode assembly is disposed within the housing, and the support component comprises a first support member and a second support member, wherein the first support member is disposed between the shell and the electrode assembly, and the second support member is disposed between the first end cap and the electrode assembly. The restraining component at least connects the first support member and the electrode assembly.

[0006] The above technical solution introduces a restraining component, which can at least connect and fix the electrode assembly and the first support member so that the first support member, the second support member and the electrode assembly form a whole and restrain each other, thereby reducing the risk of relative displacement between the electrode assembly, the first support member and the second support member when the battery cell is subjected to an external collision impact, and can effectively improve the reliability of the battery cell.

[0007] In some embodiments of the first aspect, the restraining member further connects the first support member and the second support member, which can further improve the connection firmness between the first support member and the second support member.

[0008] In some embodiments of the first aspect, the first support member includes a first plate and a second plate, the second support member connects the first plate and the second plate, the first plate and the second plate are respectively disposed on opposite sides of the electrode assembly along a second direction, and the first direction intersects the second direction. The restraining member connects the first plate, the second plate, and the electrode assembly.

[0009] By introducing the first and second plates to support both sides of the electrode assembly along the second direction, the above technical solution can reduce the structural complexity of the first support member while meeting the support requirements of the electrode assembly, thereby helping to increase the energy density of the battery cell and reduce costs. Furthermore, the first plate, second plate, second support member, and electrode assembly are connected to form a whole via a restraining member, which restrains each other and reduces the risk of relative displacement between the electrode assembly, first plate, second plate, and second support member when the battery cell is subjected to external impact, effectively improving the reliability of the battery cell.

[0010] In some embodiments of the first aspect, the restraining member is bound around the periphery of the first plate, the second plate, and the electrode assembly, and a surrounding axis of the restraining member intersects the second direction.

[0011] The above technical solution can further improve the connection and fixing effect of the restraining component on the first plate, the second plate and the electrode assembly, thereby further improving the reliability of the battery cell.

[0012] In some embodiments of the first aspect, the circumferential axis is perpendicular to the second direction.

[0013] The above technical solution ensures that the binding force applied by the binding component to the first plate and the second plate is roughly parallel to the second direction, which can reduce the component of the binding force applied by the binding component to the first plate and the second plate in the direction intersecting with the second direction, thereby further improving the connection and fixing effect of the binding component on the first plate and the second plate.

[0014] In some embodiments of the first aspect, the surrounding axis is parallel to the first direction, which can reduce the difficulty of setting the restraining component and help reduce costs.

[0015] In some embodiments of the first aspect, the first direction, the second direction, and the thickness direction of the battery cell are perpendicular to each other.

[0016] The above technical solution can reduce the setting volume of the first plate and the second plate, thereby reducing the occupancy rate of the first plate and the second plate to the internal space of the battery, and can improve the energy density of the battery cell and reduce the cost while meeting the support requirements of the electrode assembly.

[0017] In some embodiments of the first aspect, there are multiple restraining members, and the multiple restraining members are arranged along the first direction, which can further improve the connection firmness between the support member and the electrode assembly, thereby further improving the reliability of the battery cell.

[0018] In some embodiments of the first aspect, the housing further comprises a second end cap, the housing having a second opening at the other end along the first direction, the second end cap being connected to the housing and covering the second opening. The support component further comprises a third support member, the first support member and the third support member being connected, the third support member being disposed between the second end cap and the electrode assembly.

[0019] The first support member, the second support member, the third support member and the electrode assembly of the above technical solution can be connected to form a whole by a restraining component, restraining each other, reducing the risk of relative displacement between the electrode assembly, the first support member, the second support member and the third support member when the battery cell is subjected to an external collision impact, and can effectively improve the reliability of the battery cell.

[0020] In some embodiments of the first aspect, the restraining member further connects the first support member and the third support member, which can further improve the connection firmness between the first support member and the third support member.

[0021] In some embodiments of the first aspect, the first support member, the second support member, and the third support member are an integrally formed structure.

[0022] On the one hand, there is no need to connect the first, second, and third support members through an additional connection process, which simplifies the manufacturing process. At the same time, compared with connecting the first, second, and third support members through an additional connection process, the integrated structure of the first, second, and third support members has a higher connection strength.

[0023] In some embodiments of the first aspect, the restraining member covers an outer surface of the electrode assembly; and / or the restraining member covers an outer surface of the support member.

[0024] The above technical solution can not only improve the connection stability of the restraining components, but also improve the reliability of the battery cells.

[0025] In a second aspect, the present application provides a battery device comprising the battery cell provided in any embodiment of the first aspect.

[0026] In a third aspect, the present application provides an electrical device, which includes a battery cell provided by any embodiment of the first aspect or a battery device provided by any embodiment of the second aspect, and the battery cell or the battery device is used to store or provide electrical energy.

[0027] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0029] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0030] Figure 2 A schematic diagram of an exploded structure of a battery device provided in some embodiments of the present application;

[0031] Figure 3 A schematic structural diagram of a battery module provided in some embodiments of the present application;

[0032] Figure 4 A schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0033] Figure 5 for Figure 4 A schematic diagram of the three-dimensional structure of the electrode assembly, support component and restraint component of the battery cell shown;

[0034] Figure 6 A schematic diagram of an exploded structure of another battery cell provided in some embodiments of the present application;

[0035] Figure 7 for Figure 6 A schematic diagram of the three-dimensional structure of the electrode assembly, support component and restraint component of the battery cell shown;

[0036] Figure 8 A schematic diagram of an exploded structure of another battery cell provided in some embodiments of the present application;

[0037] Figure 9 for Figure 8 The diagram shows a three-dimensional structure of the electrode assembly, support component and restraint component of a battery cell.

[0038] The accompanying drawings in the specific implementation manner are as follows:

[0039] 1. Vehicle; 2. Battery device; 3. Controller; 4. Motor; 5. Housing; 5a. First housing portion; 5b. Second housing portion; 5c. Accommodation space; 6. Battery module; 7. Battery cell;

[0040] 10. Housing; 11. Shell; 111. First opening; 112. Second opening; 12. First end cover; 13. Second end cover;

[0041] 20. Electrode assembly;

[0042] 30. Support member; 31. First support member; 311. First plate; 312. Second plate; 32. Second support member; 33. Third support member;

[0043] 40. Binding components;

[0044] X, first direction; Y, second direction; Z, thickness direction. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0047] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0049] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0050] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0051] The term "plurality" used in this application refers to two or more (including two).

[0052] In this application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0053] In the embodiment of the present application, the battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0054] 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., and the embodiments of the present application are not limited to this.

[0055] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode and a negative electrode. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are intercalated and released back and forth between the positive and negative electrodes.

[0056] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0057] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0058] As an example, the positive electrode current collector may be a metal foil, a conductive polymer material, a carbon material or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal may be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0059] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05O2) and at least one of its modified compounds. The modified compound refers to a substance obtained by modifying the above substances by means of doping or coating.

[0060] In some embodiments, a metal foam may be used as the positive electrode. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When the metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, the positive electrode active material may be filled and / or deposited within the metal foam.

[0061] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0062] As an example, the negative electrode current collector may be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, or a surface-treated metal may be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0063] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0064] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0065] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0066] In some embodiments, the negative electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. When the metal foam is used as the negative electrode sheet, the surface of the metal foam may or may not be provided with a negative electrode active material.

[0067] As an example, the negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0068] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0069] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0070] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0071] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. The surface of the separator can also be coated with an inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating.

[0072] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0073] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0074] The liquid electrolyte includes an electrolyte salt and a solvent.

[0075] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0076] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0077] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, or additives capable of improving certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0078] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0079] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0080] As an example, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

[0081] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphide, germanium silver sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0082] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0083] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0084] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0085] In some embodiments, the electrode assembly is a laminate structure.

[0086] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0087] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0088] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0089] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0090] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0091] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0092] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0093] In some embodiments, the battery cell may include an outer shell. The outer shell may 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. In some embodiments, the outer shell may be a sealed structure or a non-sealed structure. As an example, when the outer shell is a non-sealed structure, the outer shell serves to protect the electrode assembly, and a sealing bag is further included between the outer shell and the electrode assembly, which is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the outer shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0094] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include square-shell, blade-shaped, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0095] In some embodiments, the housing includes an end cap and a shell, wherein the shell has an opening and the end cap covers the opening. The shell may have one or more openings. One or more end caps may also be provided.

[0096] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collecting member. The electrode terminal may be provided on an end cap or on the housing.

[0097] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0098] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0099] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing multiple battery cells to form an independent module. As an example, the battery module may be formed by bundling multiple battery cells with a cable tie.

[0100] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0101] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0102] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0103] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0104] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0105] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0106] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and power tools.

[0107] In the development of battery technology, the reliability of battery cells directly affects the reliability, cost, and user experience of end products. In battery cells, support components are typically located between the outer casing and the electrode assembly to limit the movement of the electrode assembly. However, when a battery cell is subjected to an external impact, the electrode assembly and support components within the cell are susceptible to shock and vibration, resulting in relative displacement between the electrode assembly and the support components. This can easily cause severe localized pressure on the electrode assembly, thereby seriously affecting the reliability of the battery cell.

[0108] Based on the above considerations, an embodiment of the present application provides a battery cell, comprising a housing, an electrode assembly, a support component, and a restraining component. The housing comprises a shell and a first end cap. The shell has a first opening at one end along a first direction. The first end cap is connected to the shell and covers the first opening. The electrode assembly is disposed within the housing. The support component comprises a first support member and a second support member, the first support member and the second support member being connected. The first support member is disposed between the shell and the electrode assembly, and the second support member is disposed between the first end cap and the electrode assembly. The restraining component at least connects the first support member and the electrode assembly.

[0109] The above technical solution introduces a restraining component, which can at least connect and fix the electrode assembly and the first support member so that the first support member, the second support member and the electrode assembly form a whole and restrain each other, thereby reducing the risk of relative displacement between the electrode assembly, the first support member and the second support member when the battery cell is subjected to an external collision impact, and can effectively improve the reliability of the battery cell.

[0110] The battery cells provided in the embodiments of the present application are introduced below with reference to the accompanying drawings.

[0111] Figure 1 A schematic structural diagram of a vehicle provided for some embodiments of the present application.

[0112] Continue to refer Figure 1 The vehicle 1 is provided with a battery device 2 inside. The battery device 2 can be provided at the bottom, head, or tail of the vehicle 1. The battery device 2 can be used to power the vehicle 1. For example, the battery device 2 can serve as an operating power source for the vehicle 1.

[0113] The vehicle 1 may further include a controller 3 and a motor 4 . The controller 3 is used to control the battery device 2 to supply power to the motor 4 , for example, to meet the power requirements of the vehicle 1 during startup, navigation, and driving.

[0114] In some embodiments of the present application, the battery device 2 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0115] Figure 2 Schematic diagram of an explosion of a battery device provided in some embodiments of the present application.

[0116] Continue to refer Figure 2 The battery device 2 includes a box body 5 and a battery cell, and the battery cell is accommodated in the box body 5.

[0117] The housing 5 is used to house battery cells and can have various structures. In some embodiments, the housing 5 can include a first housing portion 5a and a second housing portion 5b. The first housing portion 5a and the second housing portion 5b overlap each other, and the first housing portion 5a and the second housing portion 5b together define a storage space 5c for accommodating the battery cells. The second housing portion 5b can be a hollow structure with one end open. The first housing portion 5a is a plate-like structure, and the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. The first housing portion 5a and the second housing portion 5b can also be hollow structures with one end open. The open side of the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. Of course, the first housing portion 5a and the second housing portion 5b can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0118] In order to improve the sealing performance after the first box body 5a and the second box body 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 5a and the second box body 5b.

[0119] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box body.

[0120] In the battery device 2, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit can be housed within the housing 5. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid connection to form a battery module 6, and then the multiple battery modules 6 can be connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 5.

[0121] Figure 3 for Figure 2 The schematic diagram of the battery module is shown.

[0122] In some embodiments, continue to refer to Figure 3 There are multiple battery cells 7, and the multiple battery cells 7 are first connected in series, in parallel, or in mixed series to form a battery module 6. The multiple battery modules 6 are then connected in series, in parallel, or in mixed series to form a whole, and are accommodated in the box.

[0123] The multiple battery cells 7 in the battery module 6 can be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 7 in the battery module 6 .

[0124] Figure 4 This is a schematic diagram of the explosion structure of a battery cell provided in some embodiments of the present application. Figure 5 for Figure 4 The schematic diagram of the three-dimensional structure of the electrode assembly, support component and restraint component of the battery cell shown in the figure is as follows: Figure 6 This is a schematic diagram of the explosion structure of another battery cell provided in some embodiments of the present application. Figure 7 for Figure 6 The schematic diagram of the three-dimensional structure of the electrode assembly, support component and restraint component of the battery cell shown in the figure is as follows: Figure 8 This is a schematic diagram of an exploded structure of another battery cell provided in some embodiments of the present application. Figure 9 for Figure 8 The diagram shows a three-dimensional structure of the electrode assembly, support component and restraint component of a battery cell.

[0125] Continue to refer Figures 4 to 9 The embodiment of the present application provides a battery cell 7, which includes a housing 10, an electrode assembly 20, a support component 30, and a restraining component 40. The housing 10 includes a shell 11 and a first end cap 12. The shell 11 has a first opening 111 at one end along a first direction X. The first end cap 12 is connected to the shell 11 and covers the first opening 111. The electrode assembly 20 is disposed within the housing 10. The support component 30 includes a first support member 31 and a second support member 32. The first support member 31 and the second support member 32 are connected. The first support member 31 is disposed between the housing 11 and the electrode assembly 20, and the second support member 32 is disposed between the first end cap 12 and the electrode assembly 20. The restraining component 40 connects at least the first support member 31 and the electrode assembly 20.

[0126] Exemplarily, the housing 10 is a component used to create an internal environment for the battery cell 7. This internal environment can accommodate the electrode assembly 20, electrolyte, and other components. Optionally, the housing 10 can be made of, but is not limited to, metal or non-metallic materials. For example, metal materials can include copper, aluminum, or stainless steel; non-metallic materials can include polyethylene, polypropylene, or polyvinyl chloride.

[0127] The electrode assembly 20 is the component in the battery cell 7 where the electrochemical reaction occurs. The electrode assembly 20 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active materials constitute the main body of the electrode assembly 20, and the portions of the positive and negative electrode sheets without active materials each constitute the tabs. The positive and negative electrode tabs can be located together at one end of the main body or separately at both ends of the main body. During the battery's charge and discharge process, the positive and negative electrode active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current circuit.

[0128] The support component 30 is used to support the electrode assembly 20. The support component 30 is placed between the inner wall of the outer shell 10 and the outer surface of the electrode assembly 20. The number of support components 30 is at least one, and can be one, two, three or more. The shape of the support component 30 corresponds to the shape of the outer surface of the electrode assembly 20. For example, the outer surface of the electrode assembly 20 includes a first surface, and the shape of the first surface is a rectangle. The shape of the support component 30 adjacent to the first surface is a corresponding rectangular plate. When the battery cell 7 is subjected to an external impact, the support component 30 can absorb part of the impact force and reduce the impact of the impact force on the electrode assembly 20.

[0129] In some examples, the outer surface of the electrode assembly 20 and the inner wall of the housing 10 are interferingly fitted to clamp the support member 30. This allows the housing 10, the electrode assembly 20, and the support member 30 to be securely connected, thereby allowing the support member 30 to better support the electrode assembly 20.

[0130] The support member 30 may be disposed between any pair of opposing surfaces of the electrode assembly 20 and the housing 10 .

[0131] As some examples, the electrode assembly 20 and the housing 10 are both rectangular structures. The electrode assembly 20 includes a first surface, a second surface, a third surface, and a fourth surface along its circumference. The housing 10 includes a first inner wall surface, a second inner wall surface, a third inner wall surface, and a fourth inner wall surface along its circumference. The first surface is opposite to the first inner wall surface, the second surface is opposite to the second inner wall surface, the third surface is opposite to the third inner wall surface, and the fourth surface is opposite to the fourth inner wall surface. The support member 30 can be arranged between the first surface and the first inner wall surface, and / or between the second surface and the second inner wall surface, and / or between the third surface and the third inner wall surface, and / or between the fourth surface and the fourth inner wall surface.

[0132] As another example, the electrode assembly 20 and the housing 10 are both rectangular structures. The electrode assembly 20 includes a first end surface and a second end surface along its own axis, and the housing 10 includes a first inner end surface and a second inner end surface along its own axis. The first end surface and the first inner end surface are opposite, and the second end surface and the second inner end surface are opposite. The support member 30 can be disposed between the first end surface and the first inner end surface, and / or between the second end surface and the second inner end surface.

[0133] Optionally, the supporting component 30 may be, but is not limited to, a plate-shaped structure, a block-shaped structure, a frame or a columnar structure.

[0134] Optionally, the support component 30 may be made of, but is not limited to, metal or non-metal materials. For example, the metal material may be copper, aluminum, or stainless steel; the non-metal material may be polyethylene, polypropylene, or polyvinyl chloride.

[0135] The restraining member 40 is used to connect the electrode assembly 20 and the support member 30 to ensure relative fixation between the electrode assembly 20 and the support member 30. The restraining member 40 can be directly connected to the electrode assembly 20 and the support member 30, or it can be restrained to the electrode assembly 20 and the support member 30 by other components. As an example, the restraining member 40 is bonded to the electrode assembly 20, and the restraining member 40 is bonded to the support member 30.

[0136] Optionally, the restraining member 40 may be, but is not limited to, an adhesive tape or a heat shrink film. For example, the adhesive tape may be, but is not limited to, polyethylene tape, polypropylene tape, polyvinyl chloride tape, polyester tape, paper tape, cloth tape, or foam tape; the heat shrink film may be, but is not limited to, polyethylene heat shrink film, polyvinyl chloride heat shrink film, polyolefin heat shrink film, or polyethylene terephthalate heat shrink film.

[0137] By introducing the restraining component 40, the restraining component 40 can connect and fix the electrode assembly 20 and the support component 30 so that the electrode assembly 20 and the support component 30 form a whole and restrain each other, thereby reducing the risk of relative displacement between the electrode assembly 20 and the support component 30 when the battery cell 7 is subjected to an external collision impact, and can effectively improve the reliability of the battery cell 7.

[0138] The first end cap 12 refers to a component that covers the first opening 111 of the shell 11 to isolate the internal environment of the battery cell 7 from the external environment. Optionally, the shape of the first end cap 12 can be adapted to the shape of the shell 11 to match the shell 11. Optionally, the first end cap 12 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the first end cap 12 is not easily deformed when squeezed or collided, so that the battery cell 7 can have a higher structural strength and improved reliability. Functional components such as terminal groups can be arranged on the first end cap 12. The material of the first end cap 12 can also be various. For example, the first end cap 12 can be but not limited to being made of metal or non-metallic materials. For example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metallic material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0139] The shell 11 is a component used to cooperate with the first end cover 12 to form the internal environment of the battery cell 7. The internal environment formed can be used to accommodate the electrode assembly 20, electrolyte and other components. The shell 11 and the first end cover 12 can be independent components. A first opening 111 can be set on the shell 11, and the internal environment of the battery cell 7 can be formed by covering the first end cover 12 with the first opening 111 at the first opening 111. Optionally, the first end cover 12 and the shell 11 can also be integrated. Specifically, the first end cover 12 and the shell 11 can form a common connection surface before other components are put into the shell. When the interior of the shell 11 needs to be encapsulated, the first end cover 12 is covered with the shell 11. The shell 11 can be of various shapes and sizes, such as rectangular, cylindrical, hexagonal, etc. Specifically, the shape of the shell 11 can be determined according to the specific shape and size of the electrode assembly 20. The shell 11 can be made of various materials. For example, the shell 11 can be but is not limited to being made of metal or non-metal materials. For example, the metal material can be copper, aluminum or stainless steel; the non-metal material can be polyethylene, polypropylene or polyvinyl chloride.

[0140] Optionally, the first end cap 12 may be detachably connected to the housing 11 or may be integrally provided on the housing 11. The first end cap 12 may be directly connected to the housing 11 or may be secured to the housing 11 by other components. As an example, the connection between the first end cap 12 and the housing 11 may be, but is not limited to, welding, riveting, or bonding.

[0141] The first support member 31 is used to support the side of the electrode assembly 20 facing the housing 11, and the second support member 32 is used to support the side of the electrode assembly 20 facing the first end cap 12. The first support member 31 can be detachably connected to the second support member 32, or can be integrally provided on the second support member 32. The first support member 31 can be directly connected to the second support member 32, or can be restrained to the second support member 32 by other components. As an example, the connection method between the first support member 31 and the second support member 32 can be, but is not limited to, bolting, welding, plugging, riveting, or bonding.

[0142] The restraining member 40 connects at least the first support member 31 and the electrode assembly 20. For example, the restraining member 40 may connect the first support member 31 and the electrode assembly 20, or may connect both the first support member 31 and the electrode assembly 20 and the second support member 32 and the electrode assembly 20.

[0143] By introducing the first support member 31 and the second support member 32, the above technical solution can more specifically support different positions of the electrode assembly 20, which is conducive to improving the supporting effect of the support member 30. In addition, the first support member 31, the second support member 32, and the electrode assembly 20 can be connected to form a whole by the restraining member 40, and restrain each other, reducing the risk of relative displacement between the electrode assembly 20, the first support member 31, and the second support member 32 when the battery cell 7 is subjected to an external collision impact, and can effectively improve the reliability of the battery cell 7.

[0144] In some embodiments, the restraining member 40 further connects the first support member 31 and the second support member 32 , which can further improve the connection firmness between the first support member 31 and the second support member 32 .

[0145] The restraining member 40 may be directly connected to the first support member 31 and the second support member 32 , or may be restricted on the first support member 31 and the second support member 32 through other components.

[0146] In some embodiments, the first support member 31 and the second support member 32 are integrally formed. This simplifies the manufacturing process by eliminating the need for an additional joining process. Furthermore, the integral structure provides a stronger connection between the first and second support members 31, 32 than would be achieved by an additional joining process.

[0147] In some embodiments, the first support member 31 includes a first plate 311 and a second plate 312. The second support member 32 connects the first plate 311 and the second plate 312. The first plate 311 and the second plate 312 are respectively disposed on opposite sides of the electrode assembly 20 along the second direction Y. The first direction X intersects the second direction Y. The restraining member 40 connects the first plate 311, the second plate 312, and the electrode assembly 20.

[0148] Exemplarily, the second support member 32 extends approximately along the second direction Y, and the two ends of the second support member 32 along the second direction Y are respectively connected to the first plate 311 and the second plate 312, the first plate 311 extends approximately along the first direction X, and the second plate 312 extends approximately along the first direction X.

[0149] In some examples, the restraining member 40 may be an integral structure, where the restraining member 40 connects the first plate 311 , the second plate 312 , and the electrode assembly 20 .

[0150] In other examples, the restraining component 40 may also be a split structure, and the split restraining component 40 includes a first restraining member and a second restraining member, the first restraining member connects the first plate 311 and the electrode assembly 20, and the second restraining member connects the second plate 312 and the electrode assembly 20.

[0151] The first plate 311 and the second plate 312 may have the same structure, shape and material, or may have different structures, shapes and materials. For example, the first plate 311 and the second plate have the same structure, shape and material, which is beneficial to simplifying the manufacturing process and reducing costs.

[0152] The above technical solution, by introducing the first plate 311 and the second plate 312 to support both sides of the electrode assembly 20 along the second direction Y, can reduce the structural complexity of the first support member 31 while meeting the support requirements of the electrode assembly 20, thereby helping to improve the energy density of the battery cell 7 and reduce costs. In addition, the first plate 311, the second plate 312, the second support member 32, and the electrode assembly 20 can be connected to form an integral whole via the restraining member 40, thereby restraining each other and reducing the risk of relative displacement between the electrode assembly 20, the first plate 311, the second plate 312, and the second support member 32 when the battery cell 7 is subjected to an external impact, thereby effectively improving the reliability of the battery cell 7.

[0153] In some embodiments, the binding member 40 is bound around the first plate 311 , the second plate 312 , and the outer circumference of the electrode assembly 20 , and the surrounding axis of the binding member 40 intersects with the second direction Y.

[0154] For example, the binding member 40 may be a closed loop structure, and the binding member 40 in the closed loop structure binds the first plate 311 , the second plate 312 and the electrode assembly 20 from the outside.

[0155] The above technical solution can further improve the connection and fixing effect of the restraining component 40 on the first plate 311 , the second plate 312 and the electrode assembly 20 , thereby further improving the reliability of the battery cell 7 .

[0156] In some embodiments, the surrounding axis of the restraining component 40 is perpendicular to the second direction Y, so that the restraining force applied by the restraining component 40 to the first plate 311 and the second plate 312 is roughly parallel to the second direction Y, which can reduce the component of the restraining force applied by the restraining component 40 to the first plate 311 and the second plate 312 in the direction intersecting with the second direction Y, thereby further improving the connection and fixing effect of the restraining component 40 on the first plate 311 and the second plate 312.

[0157] In some embodiments, the surrounding axis of the restraining component 40 is parallel to the first direction X, which can reduce the difficulty of setting the restraining component 40 and help reduce costs.

[0158] In some embodiments, the first direction X, the second direction Y, and the thickness direction Z of the battery cell 7 are perpendicular to each other.

[0159] For example, the first direction X can be understood as the length direction of the battery cell 7, and the second direction Y can be understood as the width direction of the battery cell 7. The two opposite surfaces of the electrode assembly 20 along the thickness direction Z of the battery cell 7 can be understood as the large surface, and the two opposite surfaces of the electrode assembly 20 along the second direction Y can be understood as the small surface. The large surface refers to the side of the electrode assembly 20 with a larger area, and the small surface refers to the side of the electrode assembly 20 with a smaller area.

[0160] The above technical solution can reduce the setting volume of the first plate 311 and the second plate 312, thereby reducing the occupancy rate of the first plate 311 and the second plate 312 to the internal space of the battery, and can improve the energy density of the battery cell 7 and reduce the cost while meeting the support requirements of the electrode assembly 20.

[0161] In some embodiments, there are multiple restraining members 40 , and the multiple restraining members 40 are arranged along the first direction X. This can further improve the connection strength between the supporting member 30 and the electrode assembly 20 , thereby further improving the reliability of the battery cell 7 .

[0162] In some embodiments, the binding member 40 is bound around the first plate 311 , the second plate 312 , and the second support member 32 , and the binding axis of the binding member 40 is parallel to the first direction X.

[0163] Exemplarily, the binding component 40 can be a closed loop structure, the first plate 311 is connected to the outer surface of one side of the second support member 32 along the second direction Y, and the second plate 312 is connected to the outer surface of the other side of the second support member 32 along the second direction Y. The binding component 40 with a closed loop structure binds the first plate 311, the second plate 312 and the second support member 32 from the outside.

[0164] The above technical solution can further improve the connection stability between the first plate 311 , the second plate 312 and the second support member 32 , thereby further improving the reliability of the battery cell 7 .

[0165] In some embodiments, the housing 10 further includes a second end cap 13. The housing 11 has a second opening 112 at the other end portion along the first direction X. The second end cap 13 is connected to the housing 11 and covers the second opening 112. The support component 30 further includes a third support member 33. The first support member 31 and the third support member 33 are connected, and the third support member 33 is disposed between the second end cap 13 and the electrode assembly 20.

[0166] The second end cover 13 refers to a component that covers the second opening 112 of the shell 11 to isolate the internal environment of the battery cell 7 from the external environment. Optionally, the shape of the second end cover 13 can be adapted to the shape of the shell 11 to match the shell 11. Optionally, the second end cover 13 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the second end cover 13 is not easily deformed when squeezed or collided, so that the battery cell 7 can have a higher structural strength and improved reliability. Functional components such as terminal groups can be arranged on the second end cover 13. The material of the second end cover 13 can also be various. For example, the second end cover 13 can be but not limited to being made of metal or non-metallic materials. For example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metallic material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0167] The shell 11 and the second end cap 13 can be independent components. A second opening 112 can be provided on the shell 11. The second end cap 13 is covered with the second opening 112 at the second opening 112 to form the internal environment of the battery cell 7. Optionally, the second end cap 13 and the shell 11 can be integrated. Specifically, the second end cap 13 and the shell 11 can form a common connection surface before other components are put into the shell. When the interior of the shell 11 needs to be encapsulated, the second end cap 13 is covered with the shell 11. The shell 11 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 11 can be determined according to the specific shape and size of the electrode assembly 20. The material of the shell 11 can be various. For example, the shell 11 can be made of, but not limited to, metal or non-metallic materials. For example, the metal material can be copper, aluminum, or stainless steel, etc.; the non-metallic material can be polyethylene, polypropylene, or polyvinyl chloride, etc.

[0168] Optionally, the second end cap 13 may be detachably connected to the housing 11 or may be integrally provided on the housing 11. The second end cap 13 may be directly connected to the housing 11 or may be secured to the housing 11 by other components. As an example, the second end cap 13 and the housing 11 may be connected by, but is not limited to, welding, riveting, or bonding.

[0169] The third support member 33 is used to support the side of the electrode assembly 20 facing the second end cap 13. The first support member 31 can be detachably connected to the third support member 33 or integrally provided on the third support member 33. The first support member 31 can be directly connected to the third support member 33 or restrained to the third support member 33 by other components. As an example, the connection method between the first support member 31 and the third support member 33 can be, but is not limited to, bolting, welding, plugging, riveting, or bonding.

[0170] The first support member 31, the second support member 32, the third support member 33 and the electrode assembly 20 of the above technical solution can be connected to form a whole through the restraining member 40, restraining each other, reducing the risk of relative displacement between the electrode assembly 20, the first support member 31, the second support member 32 and the third support member 33 when the battery cell 7 is subjected to an external collision impact, and can effectively improve the reliability of the battery cell 7.

[0171] In some embodiments, the restraining member 40 further connects the first support member 31 and the third support member 33 , thereby further improving the connection strength between the first support member 31 and the third support member 33 .

[0172] The restraining member 40 may be directly connected to the first support member 31 and the third support member 33 , or may be restricted on the first support member 31 and the third support member 33 through other components.

[0173] In some embodiments, the binding member 40 is bound around the first plate 311 , the second plate 312 , and the second support member 32 , and the binding axis of the binding member 40 is parallel to the first direction X.

[0174] Exemplarily, the binding component 40 can be a closed loop structure, the first plate 311 is connected to the outer surface of one side of the second support member 32 along the second direction Y, and the second plate 312 is connected to the outer surface of the other side of the second support member 32 along the second direction Y. The binding component 40 with a closed loop structure binds the first plate 311, the second plate 312 and the second support member 32 from the outside.

[0175] The above technical solution can further improve the connection stability between the first plate 311 , the second plate 312 and the second support member 32 , thereby further improving the reliability of the battery cell 7 .

[0176] In some embodiments, the first support member 31 , the second support member 32 and the third support member 33 are an integrally formed structure.

[0177] On the one hand, there is no need to use an additional connection process to connect the first support member 31, the second support member 32, and the third support member 33, which simplifies the manufacturing process. At the same time, compared with connecting the first support member 31, the second support member 32, and the third support member 33 through an additional connection process, the integrated structure of the first support member 31, the second support member 32, and the third support member 33 has a higher connection strength.

[0178] In some embodiments, the restraining member 40 covers the outer surface of the electrode assembly 20. This increases the contact area between the restraining member 40 and the electrode assembly 20, thereby enhancing the connection stability of the restraining member 40. Furthermore, the restraining member 40 protects the electrode assembly 20, reducing the risk of damage to the electrode assembly 20 and improving the reliability of the battery cell 7.

[0179] In some embodiments, the restraining member 40 covers the outer surface of the support member 30. This increases the contact area between the restraining member 40 and the support member 30, thereby enhancing the connection stability of the restraining member 40. Furthermore, the restraining member 40 protects the support member 30, reducing the risk of damage to the support member 30 and improving the reliability of the battery cell 7.

[0180] In some embodiments, the restraining member 40 covers both the outer surface of the electrode assembly 20 and the outer surface of the supporting member 30 , thereby further improving the connection stability of the restraining member 40 and the reliability of the battery cell 7 .

[0181] In some embodiments, the second support member 32 includes a first main body portion and a first clamping portion, the first clamping portion protrudes from the outer surface of the first main body portion along the second direction, and at least one of the first plate 311 and the second plate 312 abuts against the first clamping portion in the first direction.

[0182] During the assembly process of the first support member 31 and the second support member 32, the first clamping portion can play a positioning role, thereby improving the assembly accuracy between the first support member 31 and the second support member 32 and reducing the difficulty of assembly positioning. In addition, the first clamping portion can also limit the movement of the first support member 31 in the first direction, thereby improving the stability of the first support member 31.

[0183] In some embodiments, the third support member 33 includes a second main body portion and a second clamping portion, the second clamping portion protrudes from the outer surface of the second main body portion along the second direction, and at least one of the first plate 311 and the second plate 312 abuts against the second clamping portion in the first direction.

[0184] During the assembly process of the first support member 31 and the third support member 33, the second clamping portion can play a positioning role, thereby improving the assembly accuracy between the first support member 31 and the third support member 33 and reducing the difficulty of assembly positioning. In addition, the second clamping portion can also limit the movement of the first support member 31 in the first direction, thereby improving the stability of the first support member 31.

[0185] According to some embodiments of the present application, the present application further provides a battery device, comprising a battery cell 7 according to any of the above solutions.

[0186] According to some embodiments of the present application, the present application further provides an electrical device, comprising a battery cell 7 or a battery device according to any of the above schemes, wherein the battery cell 7 or the battery device is used to store or provide electrical energy.

[0187] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. All technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0188] In order to better understand the battery cell 7 provided in the embodiment of the present application, based on the same inventive concept, an embodiment of the above-mentioned battery cell 7 in actual application is provided here for illustration.

[0189] The embodiment of the present application provides a battery cell 7, which includes a housing 10, an electrode assembly 20, a support member 30, and a restraining member 40. The electrode assembly 20 is disposed within the housing 10. The housing 10 includes a shell 11, a first end cap 12, and a second end cap 13. The shell 11 has a first opening 111 at one end along a first direction X and a second opening 112 at the other end along the first direction X. The first end cap 12 is connected to the shell 11 and covers the first opening 111. The second end cap 13 is connected to the shell 11 and covers the second opening 112. The support member 30 includes a first support member 31, a second support member 32, and a third support member 33. The first support member 31 is disposed between the shell 11 and the electrode assembly 20, the second support member 32 is disposed between the first end cap 12 and the electrode assembly 20, and the third support member 33 is disposed between the second end cap 13 and the electrode assembly 20. The first support member 31 includes a first plate 311 and a second plate 312. The second support member 32 connects the first plate 311 and the second plate 312. The third support member 33 connects the first plate 311 and the second plate 312. The first plate 311 and the second plate 312 are respectively disposed on opposite sides of the electrode assembly 20 along the second direction Y. The first direction X intersects the second direction Y. The restraining member 40 connects the first plate 311, the second plate 312, and the electrode assembly 20. The restraining member 40 connects at least the first support member 31 and the electrode assembly 20.

[0190] The above technical solution introduces a restraining component 40, which can connect and fix the electrode assembly 20 and the support component 30 so that the electrode assembly 20 and the support component 30 form a whole and restrain each other, thereby reducing the risk of relative displacement between the electrode assembly 20 and the support component 30 when the battery cell 7 is subjected to an external collision impact, and can effectively improve the reliability of the battery cell 7.

[0191] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises a shell and a first end cover, wherein the shell has a first opening at one end portion along a first direction, and the first end cover is connected to the shell and covers the first opening; an electrode assembly, disposed in the housing; a support member, comprising a first support member and a second support member, wherein the first support member and the second support member are connected, the first support member is disposed between the housing and the electrode assembly, and the second support member is disposed between the first end cover and the electrode assembly; A restraining component connects at least the first supporting member and the electrode assembly.

2. The battery cell according to claim 1, wherein: The tie member also connects the first support member and the second support member.

3. The battery cell according to claim 1, wherein: The first support member includes a first plate and a second plate, the second support member connects the first plate and the second plate, the first plate and the second plate are respectively arranged on both sides of the electrode assembly along a second direction, and the first direction intersects the second direction; The tie member connects the first plate, the second plate, and the electrode assembly.

4. The battery cell according to claim 3, characterized in that The binding member is bound around the first plate, the second plate, and the outer circumference of the electrode assembly, and a surrounding axis of the binding member intersects with the second direction.

5. The battery cell according to claim 4, characterized in that The circumferential axis is perpendicular to the second direction.

6. The battery cell according to claim 4, characterized in that The circumferential axis is parallel to the first direction.

7. The battery cell according to claim 3, characterized in that The first direction, the second direction, and the thickness direction of the battery cell are perpendicular to each other.

8. The battery cell according to claim 3, characterized in that There are multiple restraining components, and the multiple restraining components are arranged along the first direction.

9. The battery cell according to claim 1, characterized in that The housing further includes a second end cover, the other end portion of the housing along the first direction having a second opening, the second end cover being connected to the housing and covering the second opening; The support component further includes a third support member, the first support member and the third support member are connected, and the third support member is disposed between the second end cover and the electrode assembly.

10. The battery cell according to claim 9, characterized in that: The tie member also connects the first support member and the third support member.

11. The battery cell according to claim 9, characterized in that The first support member, the second support member and the third support member are an integrally formed structure.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The restraining member covers the outer surface of the electrode assembly; and / or, The restraining member covers an outer surface of the supporting member.

13. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 12.

14. An electrical device, characterized in that: The battery cell according to any one of claims 1 to 12 or the battery device according to claim 13 is used to store or provide electrical energy.

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