Battery cell, battery device, power consuming device, and energy storage device

Abstract

The application provides a battery monomer, a battery device, a power consumption device and an energy storage device, which can improve the use performance of the battery monomer. The battery monomer comprises a shell, an electrode assembly, an end cover assembly, a storage part and a hydrogen storage alloy. The hydrogen storage alloy comprises a first accommodating cavity with an opening at one end, the electrode assembly is accommodated in the first accommodating cavity, the end cover assembly covers the opening, the end cover assembly comprises an end cover and an insulating part, the insulating part is located between the end cover and the electrode assembly, the storage part is fixedly connected to the insulating part, the storage part forms a second accommodating cavity, or the storage part and the insulating part jointly form a second accommodating cavity, and the hydrogen storage alloy is arranged in the second accommodating cavity.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, besides improving the electrical performance of battery devices, safety is also a crucial issue. If the safety of a single battery cell cannot be guaranteed, it becomes unusable, reducing its performance. Therefore, improving the performance of single battery cells has become a pressing technical problem to be solved in this field. Utility Model Content

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

[0005] In a first aspect, a battery cell is provided, comprising: a housing including a first receiving cavity having an opening at one end; an electrode assembly received in the first receiving cavity; an end cap assembly covering the opening, the end cap assembly including an end cap and an insulating member, the insulating member being located between the end cap and the electrode assembly; a storage member fixedly connected to the insulating member, the storage member forming a second receiving cavity, or the storage member and the insulating member together forming a second receiving cavity; and a hydrogen storage alloy disposed in the second receiving cavity.

[0006] In this embodiment, by configuring a storage component and a hydrogen storage alloy in the battery cell, the storage component is fixedly connected to the insulating component, and the storage component itself forms a second receiving cavity, or the storage component and the insulating component together form a second receiving cavity, the hydrogen storage alloy is disposed in the second receiving cavity, and the hydrogen storage alloy is used to absorb hydrogen in the first receiving cavity, so as to reduce the internal pressure of the battery cell during the use of the battery cell, thereby reducing the risk of thermal runaway of the battery cell caused by hydrogen generated in the battery cell and reducing the risk of premature activation of the pressure relief mechanism, thereby improving the performance of the battery cell.

[0007] In some embodiments, the battery cell includes an electrolyte, the electrolyte includes a solvent, the solvent includes at least one of an ether solvent or an ester solvent, the electrode assembly includes a negative electrode sheet, the negative electrode sheet includes a negative current collector and an active material layer disposed on at least one side of the negative current collector, the active material layer including an elemental active metal.

[0008] In this embodiment, by setting the solvent of the electrolyte in the battery cell to include at least one of ether solvents or ester solvents, and setting the negative electrode of the electrode assembly to include a negative current collector and an active material layer disposed on at least one side of the negative current collector, wherein the active material layer includes an elemental active metal, the generation of hydrogen in the battery cell can be effectively reduced during the use of the battery cell, thereby reducing the internal pressure of the battery cell, that is, reducing the risk of thermal runaway of the battery cell caused by hydrogen generated in the battery cell and reducing the risk of premature activation of the pressure relief mechanism, thereby improving the performance of the battery cell.

[0009] In some embodiments, a first latching portion is provided on the side of the storage component facing the insulating component, and a second latching portion is provided on the side of the insulating component facing the storage component, wherein the first latching portion and the second latching portion latch each other.

[0010] In this embodiment, a first latching portion is provided on the side of the storage component facing the insulating component, and a second latching portion is provided on the side of the insulating component facing the storage component. The first latching portion and the second latching portion latch each other to fix the storage component to the insulating component, thereby improving the assembly performance of the end cap assembly and thus improving the assembly performance of the battery cell.

[0011] In some embodiments, the first snap-fit ​​portion includes a protrusion structure projecting toward the insulating member, and the second snap-fit ​​portion includes a groove structure with an opening toward the electrode assembly, wherein at least a portion of the protrusion structure is received within the groove structure.

[0012] In this embodiment, by configuring the first snap-fit ​​portion as a protruding structure protruding toward the insulating component, and the second snap-fit ​​portion as a groove structure with an opening toward the electrode assembly, and at least a portion of the protruding structure being accommodated in the groove structure, the connection strength and assembly performance between the storage component and the insulating component are taken into account, thereby improving the performance of the battery cell.

[0013] In some embodiments, the storage component is fixedly connected to a first surface of the insulating component facing the electrode assembly.

[0014] In this embodiment of the application, by setting the storage component to be fixedly connected to the first surface of the insulating component facing the electrode assembly, during the use of the battery cell, the hydrogen storage alloy in the storage component can absorb the hydrogen in the first accommodating cavity, thereby reducing the internal pressure of the battery cell, that is, reducing the risk of thermal runaway of the battery cell caused by hydrogen generated in the battery cell and reducing the risk of premature activation of the pressure relief mechanism, thereby improving the performance of the battery cell.

[0015] In some embodiments, the storage component includes a first connecting portion and a second connecting portion, the second connecting portion being disposed between the first connecting portion and the first surface, the first connecting portion, the second connecting portion and the first surface forming the second receiving cavity.

[0016] In this embodiment of the application, the storage component is configured to include a first connecting portion and a second connecting portion, with the second connecting portion disposed between the first connecting portion and the first surface. The first connecting portion, the second connecting portion, and the first surface together form the second receiving cavity, which facilitates the processing and manufacturing of the storage component and thereby improves the performance of the battery cell.

[0017] In some embodiments, the first connecting portion is provided with at least one first through hole extending along the thickness direction of the first connecting portion, and the second receiving cavity communicates with other receiving cavities in the first receiving cavity except the second receiving cavity through the first through hole.

[0018] In this embodiment, by providing at least one first through hole extending along the thickness direction of the first connecting portion, and by communicating the second receiving cavity with other receiving cavities in the first receiving cavity through the first through hole, during the use of the battery cell, the hydrogen storage alloy in the storage component can absorb the hydrogen in the first receiving cavity, thereby reducing the internal pressure of the battery cell. This reduces the risk of thermal runaway of the battery cell caused by hydrogen generated in the battery cell and the risk of premature activation of the pressure relief mechanism, thereby improving the performance of the battery cell.

[0019] In some embodiments, the minimum size of the hydrogen storage alloy is greater than the maximum size of the first through hole in the thickness direction perpendicular to the first connection portion.

[0020] In this embodiment of the application, by setting the minimum size of the hydrogen storage alloy to be larger than the maximum size of the first through hole in the thickness direction perpendicular to the first connection portion, the risk of the hydrogen storage alloy falling out of the second receiving cavity from the first through hole can be reduced during the use of the battery cell, thereby improving the performance of the storage component and thus improving the performance of the battery cell.

[0021] In some embodiments, the second connecting portion is provided with at least one second through hole extending along the thickness direction of the second connecting portion, and the second receiving cavity communicates with the receiving cavities other than the second receiving cavity in the first receiving cavity through the second through hole.

[0022] In this embodiment, by providing at least one second through hole extending along the thickness direction of the second connecting portion, and by communicating the second receiving cavity with other receiving cavities in the first receiving cavity through the second through hole, the hydrogen storage alloy in the storage component can absorb hydrogen in the first receiving cavity during the use of the battery cell, thereby reducing the internal pressure of the battery cell. This reduces the risk of thermal runaway of the battery cell caused by hydrogen generated in the battery cell and the risk of premature activation of the pressure relief mechanism, thereby improving the performance of the battery cell.

[0023] In some embodiments, the minimum dimension of the hydrogen storage alloy is greater than the maximum dimension of the second through hole in the thickness direction perpendicular to the second connection portion.

[0024] In this embodiment of the application, by setting the minimum size of the hydrogen storage alloy to be greater than the maximum size of the second through hole in the thickness direction perpendicular to the second connection portion, the risk of the hydrogen storage alloy falling out of the second receiving cavity from the second through hole can be reduced, thereby improving the performance of the storage component and thus improving the performance of the battery cell.

[0025] In some embodiments, the active metal element includes at least one of the following: lithium, sodium, potassium, zinc, and aluminum.

[0026] In this embodiment of the application, by setting the active metal to include at least one of the following: lithium, sodium, potassium, zinc, and aluminum, the generation of hydrogen in the battery cell can be effectively reduced during the use of the battery cell, thereby reducing the internal pressure of the battery cell. This reduces the risk of thermal runaway of the battery cell caused by hydrogen generated in the battery cell and reduces the risk of premature activation of the pressure relief mechanism, thereby improving the performance of the battery cell.

[0027] In some embodiments, the hydrogen storage alloy includes at least one of zirconium alloy, magnesium alloy, titanium alloy, vanadium alloy or LaxNiyMz, wherein M includes at least one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca or Bi, and 0 < x ≤ 2, 0 ≤ y ≤ 7, 0 ≤ z ≤ 3.

[0028] In this embodiment, by setting the hydrogen storage alloy to include at least one of zirconium alloy, magnesium alloy, titanium alloy, vanadium alloy, or LaxNiyMz, wherein M includes at least one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca, or Bi, and 0 < x ≤ 2, 0 ≤ y ≤ 7, 0 ≤ z ≤ 3, the generation of hydrogen in the battery cell can be effectively reduced during the use of the battery cell, thereby reducing the internal pressure of the battery cell. This reduces the risk of thermal runaway of the battery cell caused by hydrogen generated in the battery cell and the risk of premature activation of the pressure relief mechanism, thereby improving the performance of the battery cell.

[0029] In some embodiments, an electrode tab is provided on the side of the electrode assembly facing the insulating member, and the orthographic projection of the storage member and the orthographic projection of the electrode tab do not overlap on a plane perpendicular to the thickness direction of the end cap assembly.

[0030] In this embodiment, by providing an electrode tab on the side of the electrode assembly facing the insulating component, and ensuring that the orthographic projection of the storage component and the orthographic projection of the electrode tab do not overlap on a plane perpendicular to the thickness direction of the end cap assembly, the mutual influence between the storage component and the electrode tab is reduced, thereby balancing the assembly performance and usability of the storage component and improving the usability of the battery cell.

[0031] In some embodiments, the insulating component further includes an extension connected to the first surface and extending toward the electrode assembly. The maximum dimension of the extension is greater than or equal to the maximum dimension of the storage component along the thickness direction of the end cap assembly. The first surface is the surface of the insulating component facing the electrode assembly.

[0032] In this embodiment, by including an extension portion in the insulating component, the extension portion is connected to the first surface and extends toward the electrode assembly. Along the thickness direction of the end cap assembly, the maximum size of the extension portion is greater than or equal to the maximum size of the storage component, so as to reduce the mutual influence between the extension portion and the storage component, so as to take into account both the assembly performance and the performance of the storage component, thereby improving the performance of the battery cell.

[0033] In a second aspect, a battery device is provided, comprising: a plurality of battery cells, wherein the battery cells are those described in the first aspect or its various implementations.

[0034] Thirdly, an electrical device is provided, including the battery device described in the second aspect, the battery device being used to provide electrical energy to the electrical device.

[0035] In some implementations, the electrical device can be a vehicle, ship, or spacecraft.

[0036] Fourthly, an energy storage device is provided, including the battery device described in the second aspect, the battery device being used to store electrical energy for the energy storage device. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application.

[0039] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application.

[0040] Figure 3 This is an exploded structural diagram of a battery cell provided in an embodiment of this application.

[0041] Figure 4 This is an exploded structural diagram of a battery cell provided in another embodiment of this application.

[0042] Figure 5 This is an exploded structural diagram of an end cap assembly provided in an embodiment of this application.

[0043] Figure 6 This is a schematic diagram of the structure of an insulating component provided in an embodiment of this application.

[0044] Figure 7 This is a schematic diagram of the structure of an insulating component provided in another embodiment of this application.

[0045] Figure 8 This is a schematic diagram of the structure of a storage component provided in an embodiment of this application.

[0046] Figure 9 This is a schematic diagram of the structure of an insulating component provided in another embodiment of this application.

[0047] Figure 10 This is a schematic diagram of the structure of the storage component provided in another embodiment of this application.

[0048] Figure 11 This is a schematic diagram of the structure of the storage component provided in another embodiment of this application.

[0049] Figure 12 This is a schematic diagram of the structure of the storage component provided in another embodiment of this application.

[0050] Figure 13This is a schematic diagram of the structure of the storage component provided in another embodiment of this application.

[0051] Figure 14 This is a partial cross-sectional schematic diagram of a battery cell provided in an embodiment of this application.

[0052] Figure 15 This is a cross-sectional schematic diagram of an insulating component provided in an embodiment of this application.

[0053] Explanation of reference numerals in the attached drawings: 1-Vehicle; 10-Battery unit; 20-Battery cell; 30-Controller; 40-Motor; 11-Casing; 111-First part; 112-Second part; 112a-Base plate; 112b-Side plate; 21-Outer shell; 22-Electrode assembly; 211-Housing shell; 212-End cap assembly; 2121-End cap; 222-Electrode tab; 222a-Positive electrode tab; 222b-Negative electrode tab; 213-Pressure relief mechanism; 214-Electrode terminal; 21 4a - First electrode terminal; 214b - Second electrode terminal; 23 - Connecting member; 50 - First receiving cavity; 2122 - Insulating component; 2123 - First surface; 2124 - Extension; 60 - Storage component; 610 - First connecting part; 611 - First through hole; 620 - Second connecting part; 621 - Second through hole; 630 - First snap-fit ​​part; 631 - Protrusion structure; 640 - Second snap-fit ​​part; 641 - Groove structure; 70 - Second receiving cavity; 80 - Hydrogen storage alloy.

[0054] The accompanying drawings are not drawn to scale. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0057] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0058] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0059] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0060] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0061] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0062] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0063] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0064] 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.

[0065] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0066] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0067] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co At least one of the following: 0.25Mn0.25O2 (also abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.8Co0.15Al0.05O2), and their modified compounds. Modified compounds refer to substances obtained by doping or coating, etc., based on the above-mentioned materials.

[0068] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0069] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0070] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] 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.

[0072] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0073] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as 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.

[0074] In some embodiments, the negative electrode can be made of foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or a foamed alloy, etc. When foamed metal is used as the negative electrode, the surface of the foamed metal may or may not contain a negative electrode active material.

[0075] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0076] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0077] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0078] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0079] As an example, the main 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 single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0080] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0081] 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 impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0082] Liquid electrolytes include electrolyte salts and solvents.

[0083] 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 difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0084] In some embodiments, the solvent may 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, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0085] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve 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.

[0086] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0087] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0088] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0089] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0090] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0091] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0092] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0093] In some implementations, the electrode assembly is a stacked structure.

[0094] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0095] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0096] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0097] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0098] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0099] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0100] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0101] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0102] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0103] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0104] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0105] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0106] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0107] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0108] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0109] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0110] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0111] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0112] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0113] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0114] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0115] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0116] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0117] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0118] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0119] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0120] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0121] This application provides an energy storage device including one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery clusters may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0122] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0123] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0124] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0125] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0126] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0127] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes auxiliary battery management units, integrated switches, and other modules.

[0128] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an insulation monitoring module, a main battery management unit, and Ethernet and fiber optic conversion modules.

[0129] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0130] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0131] Currently, energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. In the development of battery technology, besides improving the electrical performance of battery devices, safety is also a significant concern. During the use of a battery cell, as the electrolyte in the cell's internal cavity is continuously consumed, various gases are generated within this cavity. For example, hydrogen gas is generated in sodium-ion or sodium metal battery cells, causing the pressure in the cavity to rise. This can lead to premature activation of the cell's pressure relief mechanism, thereby reducing the cell's performance. If the safety of the battery cell cannot be guaranteed, it becomes unusable, further reducing its performance. Therefore, improving the performance of battery cells has become a pressing technical problem in this field.

[0132] Therefore, embodiments of this application provide a battery cell, a battery device, an electrical device, and an energy storage device. The battery cell includes: a casing, an electrode assembly, an end cap assembly, a storage component, and a hydrogen storage alloy. The alloy includes a first receiving cavity with an opening at one end. The electrode assembly is received in the first receiving cavity. The end cap assembly covers the opening. The end cap assembly includes an end cap and an insulating component. The insulating component is located between the end cap and the electrode assembly. The storage component is fixedly connected to the insulating component. A second receiving cavity is formed between the storage component and the insulating component. The hydrogen storage alloy is disposed in the second receiving cavity. Thus, in this embodiment of the application, by configuring a storage component and a hydrogen storage alloy in the battery cell, the storage component is fixedly connected to the insulating component, and the storage component forms a second receiving cavity, or the storage component and the insulating component together form a second receiving cavity, the hydrogen storage alloy is disposed in the second receiving cavity, and the hydrogen storage alloy is used to absorb hydrogen in the first receiving cavity, so as to reduce the internal pressure of the battery cell during the use of the battery cell, thereby reducing the risk of thermal runaway of the battery cell caused by hydrogen generated in the battery cell and reducing the risk of premature activation of the pressure relief mechanism, thereby improving the performance of the battery cell.

[0133] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0134] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0135] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments will be described in detail using a vehicle as an example of an electrical device.

[0136] For example, such as Figure 1The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0137] To meet different power demands, the battery device 10 in this embodiment may include at least one battery cell assembly, which comprises multiple battery cells. These multiple battery cells can be electrically connected in series, parallel, or a combination thereof to form the battery device 10. A combination of series and parallel connections is used. The battery device 10 may also be referred to as a battery pack. For example, multiple battery cells can first be connected in series, parallel, or a combination to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form the battery device 10. That is, multiple battery cells can directly form the battery device 10, or they can first be assembled into battery modules, and then the battery modules can be assembled into the battery device 10.

[0138] For example, such as Figure 2 The diagram shown is a structural schematic of a battery device 10 according to an embodiment of this application. The battery device 10 may include multiple battery cells 20. The battery device 10 may also include a housing 11 (or cover), which has a hollow interior structure, and the multiple battery cells 20 are housed within the housing 11. For example, the multiple battery cells 20 may be connected in parallel, series, or a mixed configuration and then placed inside the housing 11.

[0139] like Figure 2As shown, the housing 11 may include two parts, referred to here as the first part 111 and the second part 112, which are fastened together. The shapes of the first part 111 and the second part 112 can be determined according to the combined shape of multiple battery cells 20. Both the first part 111 and the second part 112 may have an opening. For example, both the first part 111 and the second part 112 may be hollow cuboids with only one open face. The openings of the first part 111 and the second part 112 are opposite to each other, and the first part 111 and the second part 112 are fastened together to form a housing 11 with a closed cavity. The housing may include a bottom plate 112a, side plates 112b, and beams. Multiple battery cells 20 are connected in parallel, series, or mixed configurations and placed inside the housing 11 formed by the fastening of the first part 111 and the second part 112.

[0140] Optionally, the battery device 10 may also include other structures, which will not be described in detail here. For example, the battery device 10 may also include a busbar component for realizing the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing by a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar component.

[0141] The number of battery cells 20 can be set to any value depending on different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is unlimited and can be set according to requirements.

[0142] In this embodiment, the number of battery cells 20 can be set to any value according to different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is not limited and can be set according to requirements. The battery device 10 may include multiple battery modules, which can be connected in series, parallel, or mixed connection.

[0143] Figure 3This diagram shows an exploded view of the battery cell 20 provided in one embodiment of the present application. Figure 4 An exploded structural diagram of a battery cell 20 according to another embodiment of this application is shown. Figure 3 and Figure 4 As shown, the battery cell 20 in this embodiment may include: a housing 21 and an electrode assembly 22. The housing 21 has a closed receiving space, and the electrode assembly 22 is placed in the receiving space within the housing 21. The housing 21 may include a shell 211 and an end cap assembly 212. The shell 211 is a hollow structure with at least one opening; the end cap assembly 212 is used to fasten with the shell 211 to form the housing 21 with a closed receiving space.

[0144] It should be understood that the battery cell 20 in this application embodiment can be a secondary battery. A secondary battery refers to a battery cell 20 that can be recharged after being discharged to activate the active materials and continue to be used. For example, the battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0145] The electrode assembly 22 in this embodiment includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell 20, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0146] In some embodiments, the end cap assembly 212 may be a plate-like structure used to cover the opening of the housing 211. In other embodiments, the end cap assembly 212 has a similar structure to the housing 211, that is, both the housing 211 and the end cap assembly 212 are hollow structures with one opening, and the two openings are joined together to form an outer shell 21 with a closed receiving space.

[0147] It should be understood that if the end cap assembly 212 is a plate-shaped structure, the housing 211 can be a hollow structure with an opening at one or more ends. For example, if the housing 211 is a hollow structure with an opening at one end, the end cap assembly 212 can be set as one; if the housing 211 is a hollow structure with openings at opposite ends, the end cap assembly 212 can be set as two, and the two end cap assemblies 212 respectively cover the openings at both ends of the housing 211.

[0148] The outer shell 21 can be of various shapes, such as a cylinder, a cuboid, or other polyhedrons. For example, ... Figure 3 and Figure 4 As shown in the embodiments of this application, the description mainly takes the outer shell 21 as a cuboid structure.

[0149] It should be understood that the end cap assembly 212 in this embodiment of the application is used to cooperate with the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap assembly 212 can be adapted to the shape of the housing 211, such as... Figure 3 and Figure 4 As shown, the housing 211 has a cuboid structure, and the end cap assembly 212 has a rectangular plate structure that is adapted to the housing 211.

[0150] The material of the housing 211 in this embodiment may include one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap assembly 212 may also be one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap assembly 212 may be the same as or different from that of the housing 211; the materials of different walls of the housing 211 may also be the same or different.

[0151] The end cap assembly 212 in this embodiment can be any wall of the housing 21. For example, the end cap assembly 212 can be the wall with the largest area among the multiple walls included in the housing 21, or the wall with the smallest area, or it can be other walls. This embodiment is not limited to this. Alternatively, the end cap assembly 212 can also be other structures. For example, the end cap assembly 212 can also be a groove structure with an opening to cover the opening of the housing 211. This embodiment is not limited to this.

[0152] It should be understood that the battery cell 20 also includes electrode terminals 214. In this embodiment, the electrode terminals 214 are used for electrical connection with the electrode assembly 22 inside the battery cell 20 to output the electrical energy of the battery cell 20. Figure 3 to Figure 4As shown, the battery cell 20 may include at least two electrode terminals 214, which may include at least one first electrode terminal 214a and at least one second electrode terminal 214b. Exemplarily, if the first electrode terminal 214a is a positive electrode terminal, it is used for electrical connection to the positive electrode tab 222a of the electrode assembly 22; if the second electrode terminal 214b is a negative electrode terminal, it is used for electrical connection to the negative electrode tab 222b of the electrode assembly 22. The first electrode terminal 214a and the positive electrode tab 222a may be directly connected or indirectly connected, as may the negative electrode terminal 214b and the negative electrode tab 222b. Exemplarily, the first electrode terminal 214a may be electrically connected to the positive electrode tab 222a via a connecting member 23, and the second electrode terminal 214b may be electrically connected to the negative electrode tab 222b via a connecting member 23. It should be understood that in the embodiments of this application, the positive electrode tab 222a and the negative electrode tab 222b can be collectively referred to as electrode tab 222.

[0153] In this embodiment, the wall of the housing 211 and the wall of the end cap assembly 212 are both referred to as the wall of the battery cell 20, wherein for Figure 3 and Figure 4 The rectangular battery cell 20 shown has a housing 211 with a bottom wall and four side walls. The housing 211 is shaped according to the combination of one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one face of the housing 211 has an opening to allow one or more electrode assemblies 22 to be placed inside. For example, when the housing 211 is a hollow cuboid or cube, one plane of the housing 211 is an open face, meaning that this plane has no wall, allowing communication between the inside and outside of the housing 211. When the housing 211 can be a hollow cylinder, the end face of the housing 211 is an open face, meaning that this end face has no wall, allowing communication between the inside and outside of the housing 211. An end cap assembly 212 covers the opening and connects to the housing 211 to form a closed cavity for placing the electrode assemblies 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0154] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or multiple. For example, as... Figure 4 As shown, two electrode assemblies 22 are provided inside the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure. If the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure.

[0155] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or multiple. For example, as... Figure 4 As shown, two electrode assemblies 22 are disposed within the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure. In this embodiment, the material of the housing 211 may include the following materials: copper, iron, aluminum, steel, aluminum alloy, etc.

[0156] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0157] The pressure relief mechanism 213 can be any of the possible pressure relief mechanisms 213. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0158] In some implementations, an insulating element may also be provided in the battery cell 20. The insulating element is disposed in the accommodating space of the housing 211, and the insulating element may be a hollow structure with one or more openings. The accommodating space in the hollow structure is used to accommodate the electrode assembly 22 to improve the insulation performance of the battery cell 20.

[0159] Figure 5 An exploded view of the end cap assembly 212 provided in one embodiment of this application is shown. Figure 6 A schematic diagram of the structure of an insulating component 2122 provided in an embodiment of this application is shown. Figure 7 A schematic diagram of the structure of an insulating component 2122 provided in another embodiment of this application is shown. Figure 8 A schematic diagram of the structure of a storage component 60 provided in an embodiment of this application is shown.

[0160] For example, Figure 6 The insulating component 2122 shown in the figure is fixedly connected to the storage component 60. Figure 7 The insulating component 2122 shown in the figure does not have the storage component 60.

[0161] In some implementations, such as Figure 6 to Figure 8As shown, this application embodiment provides a battery cell 20, which includes: a housing 211, an electrode assembly 22, an end cap assembly 212, a storage component 60, and a hydrogen storage alloy 80. The housing 211 includes a first receiving cavity 50 with an opening at one end. The electrode assembly 22 is received in the first receiving cavity 50. The end cap assembly 212 covers the opening. The end cap assembly 212 includes an end cap 2121 and an insulating component 2122. The insulating component 2122 is located between the end cap 2121 and the electrode assembly 22. The storage component 60 is fixedly connected to the insulating component 2122. The storage component 60 forms a second receiving cavity 70, or the storage component 60 and the insulating component 2122 together form a second receiving cavity 70. The hydrogen storage alloy 80 is disposed in the second receiving cavity 70.

[0162] It should be understood that the housing 211 in this embodiment includes a receiving cavity 50 with an opening at one end, which can be used to receive the electrode assembly 22. That is, the housing 211 can be a hollow structure with an opening, and the electrode assembly 22 is received inside the hollow structure. It should also be understood that the shape of the opening of the housing 211 can be set to circular, square, or polygonal, etc. Specifically, the shape of the opening can be matched according to the shape of the housing 211. For example, when the housing 211 is set as follows... Figure 3 or Figure 4 In the case of the square structure shown, the opening at one end of the housing 211 can be set to be square.

[0163] It should also be understood that the end cap assembly 212 can close onto the opening to allow the electrode assembly 22 to be accommodated within the housing 211. The end cap assembly 212 may include an end cap 2121 and an insulating member 2122, the insulating member 2122 being located between the end cap 2121 and the electrode assembly 22. In embodiments of this application, the insulating member 2122 may also be referred to as the lower plastic. The end cap 2121 and the insulating member 2122 can be connected by one of the following methods: snap-fit ​​connection, adhesive connection, or welding connection. In other implementations, the end cap 2121 and the insulating member 2122 can be integrally injection molded.

[0164] It should also be understood that the storage component 60 in this embodiment is fixedly connected to the insulating component 2122, which can mean that the storage component 60 and the insulating component 2122 are connected by snap-fit, bolt, or weld. The storage component 60 may itself form the second receiving cavity 70, that is, the storage component 60 includes a second receiving cavity 70 that communicates with the interior of the housing 211 of the battery cell 20, or the storage component 60 and the insulating component 2122 together form the second receiving cavity 70, which can mean that the storage component 60 and the insulating component 2122 can enclose and form the second receiving cavity 70, and the second receiving cavity 70 can communicate with other receiving cavities in the first receiving cavity 50 besides the second receiving cavity 70.

[0165] It should also be understood that the hydrogen storage alloy 80 in this embodiment refers to an alloy capable of reacting with hydrogen gas to absorb it. The reaction process between the hydrogen storage alloy and hydrogen gas is as follows: First, hydrogen gas is catalyzed and decomposed into hydrogen atoms on the surface of the hydrogen storage alloy 80. Then, the hydrogen atoms enter the interior of the hydrogen storage alloy 80 lattice to generate metal hydrides, thereby achieving the purpose of hydrogen storage. When the internal pressure of the alkali metal battery is relatively low, the hydrogen absorption plateau pressure of the hydrogen storage alloy 80 can be reached. By controlling the hydrogen absorption plateau pressure of the hydrogen storage alloy 80 to be low, the energy barrier for the combination of metal elements in the hydrogen storage alloy 80 with hydrogen atoms in the hydrogen gas is low. After the combination of each alloy element in the hydrogen storage alloy 80 with hydrogen atoms in the hydrogen gas, the alloy tends to be stable, and the structure of the hydrogen storage alloy 80 is stable after combining with hydrogen in the hydrogen gas. Specifically, the material of the hydrogen storage alloy 80 can be determined using an X-ray diffractometer.

[0166] It should also be understood that the shape and quantity of the hydrogen storage alloy 80 in the embodiments of this application can be set according to actual needs. As an example, the embodiments of this application do not limit this.

[0167] In this embodiment, the battery cell 20 is configured to include a storage component 60 and a hydrogen storage alloy 80. The storage component 60 is fixedly connected to the insulating component 2122, and a second receiving cavity 70 is formed between the storage component 60 and the insulating component 2122. The hydrogen storage alloy 80 is disposed in the second receiving cavity 70 and is used to absorb hydrogen in the first receiving cavity 50. This reduces the internal pressure of the battery cell 20 during use, thereby reducing the risk of thermal runaway of the battery cell 20 due to hydrogen generated in the battery cell 20 and reducing the risk of premature activation of the pressure relief mechanism 213, thus improving the performance of the battery cell 20.

[0168] In some implementations, the battery cell 20 includes an electrolyte, which includes a solvent, which includes at least one of an ether solvent or an ester solvent. The electrode assembly 22 includes a negative electrode sheet, which includes a negative current collector and an active material layer disposed on at least one side of the negative current collector. The active material layer includes an elemental active metal.

[0169] It should be understood that in the embodiments of this application, ether solvents refer to organic solvents containing ether groups, and ester solvents refer to organic solvents containing ester groups. Ether solvents and ester solvents have good compatibility with the hydrogen storage alloy 80 of the embodiments of this application, and hydrogen gas will be generated during the cycling process of the alkali metal battery device 10, which will be absorbed by the hydrogen storage alloy 80, thereby reducing the internal pressure of the alkali metal battery device 10 and extending the life of the alkali metal battery device 10.

[0170] For example, when the solvent includes an ether solvent, the ether solvent includes at least one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxane. This ether solvent is compatible with various alkali metal battery devices 10 and has good compatibility with the hydrogen storage alloy 80 of this application embodiment. During the cycling process of the alkali metal battery device 10, hydrogen gas is generated, which is absorbed by the hydrogen storage alloy 80, reducing the internal pressure of the alkali metal battery device 10 and extending its service life.

[0171] For example, when the solvent includes an ester solvent, the ester solvent may include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, or diethyl sulfone.

[0172] It should also be understood that the active metal in the embodiments of this application refers to a metal that can provide active metal ions. For example, the active metal of the lithium alkali metal battery device 10 is elemental lithium, and the active metal of the sodium alkali metal battery device 10 is elemental sodium. Specifically, the alkali metal battery device 10 refers to a battery device 10 with an active metal as the negative electrode, such as lithium metal or sodium metal. In the above-mentioned types of alkali metal battery devices 10, the active metal ions such as lithium and sodium on the negative electrode are relatively active and will undergo side reactions with water, solvents in the electrolyte and residual alkali in the positive electrode active material, resulting in a large amount of gas production, and the proportion of H2 in the gas is >90%. For the above-mentioned battery device 10 that mainly produces hydrogen gas, by setting a hydrogen storage alloy 80 in the battery device 10, the hydrogen gas produced in the battery device 10 is absorbed, reducing the risk of excessive internal pressure in the alkali metal battery device 10 and improving the cycle life of the alkali metal battery device 10.

[0173] In this embodiment, by setting the solvent of the electrolyte in the battery cell 20 to include at least one of ether solvents or ester solvents, and setting the negative electrode of the electrode assembly 22 to include a negative current collector and an active material layer disposed on at least one side of the negative current collector, the active material layer including an elemental active metal, the generation of hydrogen in the battery cell 20 can be effectively reduced during the use of the battery cell 20, thereby reducing the internal pressure of the battery cell 20, that is, reducing the risk of thermal runaway of the battery cell 20 caused by hydrogen generated in the battery cell 20 and reducing the risk of premature activation of the pressure relief mechanism 213, thereby improving the performance of the battery cell 20.

[0174] In some implementations, such as Figure 7 and Figure 8 As shown, the storage component 60 has a first latching portion 630 on the side facing the insulating component 2122, and the insulating component 2122 has a second latching portion 640 on the side facing the storage component 60. The first latching portion 630 and the second latching portion 640 are latched together.

[0175] It should be understood that the first latching portion 630 provided on the side of the storage component 60 facing the insulating component 2122 can be integrally formed with the storage component 60 or separately formed. For example, when the storage component 60 and the first latching portion 630 are integrally formed, the storage component 60 and the first latching portion 630 can be welded or bonded together; or, when the storage component 60 and the first latching portion 630 are separately formed, the storage component 60 and the first latching portion 630 can be integrally injection molded.

[0176] It should also be understood that the second latching portion 640 of the insulating component 2122, located on the side facing the storage component 60, can be integrally formed with the insulating component 2122 or separately formed. For example, when the insulating component 2122 and the second latching portion 640 are integrally formed, they can be welded or bonded together; or, when the insulating component 2122 and the second latching portion 640 are separately formed, they can be integrally injection molded.

[0177] It should also be understood that the first snap-fit ​​portion 630 and the second snap-fit ​​portion 640 in the embodiments of this application are snap-fitted together, which means that the first snap-fit ​​portion 630 and the second snap-fit ​​portion 640 are snap-fitted together so that the storage component 60 is fixed to the insulating component 2122, and a second receiving cavity 70 for accommodating the hydrogen storage alloy 80 is formed between the storage component 60 and the insulating component 2122.

[0178] In this embodiment, a first latching portion 630 is provided on the side of the storage component 60 facing the insulating component 2122, and a second latching portion 640 is provided on the side of the insulating component 2122 facing the storage component 60. The first latching portion 630 and the second latching portion 640 are latched together to fix the storage component 60 to the insulating component 2122, thereby improving the assembly performance of the end cap assembly 212 and thus improving the assembly performance of the battery cell 20.

[0179] In some implementations, such as Figure 7 and Figure 8 As shown, the first snap-fit ​​portion 630 includes a protrusion structure 631 protruding toward the insulating member 2122, and the second snap-fit ​​portion 640 includes a groove structure 641 with an opening toward the electrode assembly 22, at least a portion of the protrusion structure 631 being accommodated in the groove structure 641.

[0180] It should be understood that the shape of the protruding structure 631 of the first snap-fit ​​portion 630 protruding toward the insulating member 2122 can be set according to actual needs. For example, the protruding structure 631 can be set as a hook portion.

[0181] It should also be understood that the second snap-fit ​​portion 640 includes a groove structure 641 with an opening facing the electrode assembly 22. The interior of the groove structure 641 may be provided with a mating part that engages with the protrusion structure 631. That is, the protrusion structure 631 or the hooking part can engage with the mating part to achieve a snap-fit ​​connection between the first snap-fit ​​portion 630 and the second snap-fit ​​portion 640.

[0182] It should also be understood that the shape of the groove structure 641 on the plane perpendicular to the thickness direction of the end cap assembly 212 can be set according to actual needs. For example, the shape of the groove structure 641 can be set as a circle, a rectangle or a polygon.

[0183] In this embodiment, by configuring the first latching portion 630 as a protruding structure 631 protruding toward the insulating component 2122, and the second latching portion 640 as a groove structure 641 with an opening toward the electrode assembly 22, and at least a portion of the protruding structure 631 being accommodated in the groove structure 641, the connection strength and assembly performance between the storage component 60 and the insulating component 2122 are balanced, thereby improving the performance of the battery cell 20.

[0184] In some implementations, such as Figure 6 As shown, the storage component 60 is fixedly connected to the first surface 2123 of the insulating component 2122 facing the electrode assembly 22.

[0185] It should be understood that the storage component 60 is fixedly connected to the first surface 2123 of the insulating component 2122 facing the electrode assembly 22, so that the storage component 60 is located in the first receiving cavity 50 on the side close to the electrode assembly 22, so that the hydrogen storage alloy 80 in the storage component 60 can absorb the hydrogen in the first receiving cavity 50.

[0186] In this embodiment, by configuring the storage component 60 as a first surface 2123 fixedly connected to the insulating component 2122 on the side facing the electrode assembly 22, during the use of the battery cell 20, the hydrogen storage alloy in the storage component 60 can absorb the hydrogen in the first receiving cavity 50, thereby reducing the internal pressure of the battery cell 20. This reduces the risk of thermal runaway of the battery cell 20 caused by hydrogen generated in the battery cell 20 and reduces the risk of premature activation of the pressure relief mechanism 213, thereby improving the performance of the battery cell 20.

[0187] In some implementations, such as Figure 8 As shown, the storage component 60 includes a first connecting portion 610 and a second connecting portion 620. The second connecting portion 620 is disposed between the first connecting portion 610 and the first surface 2123. The first connecting portion 610, the second connecting portion 620 and the first surface 2123 together form the second receiving cavity 70.

[0188] It should be understood that in the embodiments of this application, the first connecting portion 610 may be fixedly connected to or detachably connected to the second connecting portion 620. When the first connecting portion 610 and the second connecting portion 620 are fixedly connected, the first connecting portion 610 may be bonded or welded to the second connecting portion 620; or, when the first connecting portion 610 and the second connecting portion 620 are detachably connected, the first connecting portion 610 may be bolted or snap-fitted to the second connecting portion 620.

[0189] In this embodiment of the application, the storage component 60 is configured to include a first connecting portion 610 and a second connecting portion 620. The second connecting portion 620 is disposed between the first connecting portion 610 and the first surface 2123. The first connecting portion 610, the second connecting portion 620 and the first surface 2123 enclose and form the second receiving cavity 70, so as to facilitate the processing and manufacturing of the storage component 60, thereby improving the performance of the battery cell 20.

[0190] Figure 9 A schematic diagram of the structure of an insulating component 2122 provided in another embodiment of this application is shown. Figure 10 A schematic diagram of the structure of a storage component 60 provided in another embodiment of this application is shown.

[0191] In other implementations, such as Figure 9 and Figure 10 As shown, the second connecting portion 620 may not be connected to the first connecting portion 610; that is, the second connecting portion 620 may be connected to the insulating component 2122. Exemplarily, the second connecting portion 620 may be integrally formed with the insulating component 2122 or separately formed. If the second connecting portion 620 is integrally formed with the insulating component 2122, the insulating component 2122 and the second connecting portion 620 can be integrally formed by injection molding. Alternatively, if the second connecting portion 620 is separately formed with the insulating component 2122, the second connecting portion 620 and the insulating component 2122 can be connected by snap-fit ​​or adhesive bonding.

[0192] Figure 11 A schematic diagram of the structure of a storage component 60 provided in another embodiment of this application is shown.

[0193] In some implementations, such as Figure 11 As shown, the first connecting portion 610 is provided with at least one first through hole 611 extending along the thickness direction of the first connecting portion 610, and the second receiving cavity 70 communicates with the receiving cavities other than the second receiving cavity 70 in the first receiving cavity 50 through the first through hole 611.

[0194] It should be understood that the shape of the first through hole 611 in the embodiments of this application can be set according to actual needs. For example, the cross-sectional shape of the first through hole 611 on the plane perpendicular to the thickness direction of the first connecting part 610 can be set as a circle, an ellipse or a polygon, etc.

[0195] It should also be understood that the number of first through holes 611 in the embodiments of this application can be set according to actual needs. For example, the number of first through holes 611 provided on the first connecting part 610 can be set to one or more.

[0196] In this embodiment, by providing at least one first through hole 611 extending through the thickness direction of the first connecting portion 610, and by having the second receiving cavity 70 communicate with other receiving cavities in the first receiving cavity 70 through the first through hole 611, during the use of the battery cell 20, the hydrogen storage alloy in the storage component 60 can absorb the hydrogen in the first receiving cavity 50, thereby reducing the internal pressure of the battery cell 20. This reduces the risk of thermal runaway of the battery cell 20 caused by hydrogen generated in the battery cell 20 and the risk of premature activation of the pressure relief mechanism, thereby improving the performance of the battery cell 20.

[0197] In some implementations, the minimum dimension of the hydrogen storage alloy 80 is greater than the maximum dimension of the first through hole 611 in the thickness direction perpendicular to the first connection portion 610.

[0198] It should be understood that the fact that the minimum size of the hydrogen storage alloy 80 is greater than the maximum size of the first through hole 611 in the thickness direction perpendicular to the first connecting portion 610 means that during the use of the battery cell 20, the hydrogen storage alloy 80 is unlikely to fall out of the second receiving cavity 70 through the first through hole 611, so as to reduce the impact on the performance of the battery cell 20.

[0199] In this embodiment of the application, by setting the minimum size of the hydrogen storage alloy 80 to be larger than the maximum size of the first through hole 611 in the thickness direction perpendicular to the first connecting portion 610, the risk of the hydrogen storage alloy 80 falling out of the second receiving cavity 70 from the first through hole 611 can be reduced during the use of the battery cell 20, thereby improving the performance of the storage component 60 and thus improving the performance of the battery cell 20.

[0200] Figure 12 A schematic diagram of the structure of a storage component 60 provided in another embodiment of this application is shown. Figure 13 A schematic diagram of the structure of a storage component 60 provided in another embodiment of this application is shown.

[0201] In some implementations, such as Figure 12 andFigure 13 As shown, the second connecting portion 620 is provided with at least one second through hole 621 extending along the thickness direction of the second connecting portion 620, and the second receiving cavity 70 communicates with the receiving cavities other than the second receiving cavity 70 in the first receiving cavity 50 through the second through hole 621.

[0202] It should be understood that the shape of the second through hole 621 in the embodiments of this application can be set according to actual needs. For example, the cross-sectional shape of the second through hole 621 on the plane perpendicular to the thickness direction of the second connecting part 620 can be set as a circle, an ellipse or a polygon, etc.

[0203] It should also be understood that the number of second through holes 621 in the embodiments of this application can be set according to actual needs. For example, the number of second through holes 621 provided on the second connecting part 620 can be set to one or more.

[0204] It should also be understood that in some other implementations, such as Figure 13 As shown, the first connecting portion 610 in the storage component 60 may be provided with at least one first through hole 611, and the second connecting portion 620 in the storage component 60 may be provided with at least one second through hole 621, so that the hydrogen storage alloy 80 in the storage component 60 can effectively absorb the hydrogen in the first receiving cavity 50, thereby reducing the internal pressure of the battery cell 20.

[0205] In this embodiment, by providing at least one second through hole 621 extending through the thickness direction of the second connecting portion 620, and by having the second receiving cavity 70 communicate with the receiving cavities other than the second receiving cavity 70 in the first receiving cavity 50 through the second through hole 621, during the use of the battery cell 20, the hydrogen storage alloy 80 in the storage component 60 can absorb the hydrogen in the first receiving cavity 50, thereby reducing the internal pressure of the battery cell 20. This reduces the risk of thermal runaway of the battery cell 20 due to hydrogen generated in the battery cell 20 and the risk of premature activation of the pressure relief mechanism 213, thereby improving the performance of the battery cell 20.

[0206] In some implementations, the minimum dimension of the hydrogen storage alloy 80 is greater than the maximum dimension of the second through hole 621 in the thickness direction perpendicular to the second connection portion 620.

[0207] It should be understood that the fact that the minimum size of the hydrogen storage alloy 80 is greater than the maximum size of the second through hole 621 in the thickness direction perpendicular to the second connection portion 620 means that during the use of the battery cell 20, the hydrogen storage alloy 80 is unlikely to fall out of the second receiving cavity 70 through the second through hole 621, so as to reduce the impact on the performance of the battery cell 20.

[0208] In this embodiment of the application, by setting the minimum size of the hydrogen storage alloy 80 to be larger than the maximum size of the second through hole 621 in the thickness direction perpendicular to the second connection portion 620, the risk of the hydrogen storage alloy 80 falling out of the second receiving cavity 70 from the second through hole 621 can be reduced, thereby improving the performance of the storage component 60 and thus improving the performance of the battery cell 20.

[0209] In some implementations, the active metal element includes at least one of the following: lithium, sodium, potassium, zinc, and aluminum.

[0210] It should be understood that the alkali metal battery device 10 includes at least one of lithium metal battery device, sodium metal battery device, potassium metal battery device, zinc metal battery device, or aluminum metal battery device. The active metal ions in the aforementioned alkali metal battery device 10 are relatively reactive and will undergo side reactions with the electrolyte, producing a large amount of gas, with H2 accounting for >90% of the gas. For the aforementioned battery device 10, where the main gas produced is hydrogen, by incorporating a hydrogen storage alloy 80 within the battery device 10, the hydrogen produced in the battery device 10 is absorbed, reducing the risk of excessive internal pressure in the alkali metal battery device 10 and improving its cycle life.

[0211] In this embodiment of the application, by setting the active metal to include at least one of the following: lithium, sodium, potassium, zinc, and aluminum, the generation of hydrogen in the battery cell 20 can be effectively reduced during the use of the battery cell 20, thereby reducing the internal pressure of the battery cell 20. This reduces the risk of thermal runaway of the battery cell 20 caused by the hydrogen generated in the battery cell 20 and reduces the risk of premature activation of the pressure relief mechanism 213, thereby improving the performance of the battery cell 20.

[0212] In some implementations, the hydrogen storage alloy 80 includes at least one of zirconium alloys, magnesium alloys, titanium alloys, vanadium alloys, or LaxNiyMz, wherein M includes at least one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca, or Bi, and 0 < x ≤ 2, 0 ≤ y ≤ 7, and 0 ≤ z ≤ 3.

[0213] For example, in the embodiments of this application, x can refer to 0.1-1.9, 0.3-1.7, 0.5-1.5, 0.8-1.3, 1-1.2, etc., and in other embodiments of this application, 0.3≤x≤1.

[0214] For example, y in the embodiments of this application can be 1-6.9, 2-6, 3-5, etc., and in other embodiments of this application, 1≤y≤5.

[0215] For example, z in the embodiments of this application can be 0.1-2.9, 0.5-2.5, 1-2, etc., and in other embodiments of this application, 0≤z≤1.

[0216] It should be understood that Ti and Co elements can improve the service life and kinetics of hydrogen storage alloy 80, Mg elements can increase the hydrogen absorption capacity of hydrogen storage alloy 80, Mn and Al elements can construct the framework of hydrogen storage alloy 80 and reduce costs, Y elements can reduce the hydrogen absorption plateau pressure of hydrogen storage alloy 80, Fe, Ca and Bi elements can increase the hydrogen desorption plateau pressure of hydrogen storage alloy 80, and Fe elements can increase the hydrogen absorption plateau pressure of hydrogen storage alloy 80, while Cu elements can increase the hydrogen absorption rate of hydrogen storage alloy 80.

[0217] In this embodiment, by setting the hydrogen storage alloy 80 to include at least one of zirconium alloy, magnesium alloy, titanium alloy, vanadium alloy, or LaxNiyMz, wherein M includes at least one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca, or Bi, and 0 < x ≤ 2, 0 ≤ y ≤ 7, 0 ≤ z ≤ 3, the generation of hydrogen in the battery cell 20 can be effectively reduced during the use of the battery cell 20, thereby reducing the internal pressure of the battery cell 20. This reduces the risk of thermal runaway of the battery cell 20 caused by hydrogen generated in the battery cell 20 and the risk of premature activation of the pressure relief mechanism 213, thereby improving the performance of the battery cell 20.

[0218] Figure 14 A partial cross-sectional schematic diagram of a battery cell 20 provided in an embodiment of this application is shown.

[0219] In some implementations, such as Figure 14 As shown, an electrode tab 222 is provided on the side of the electrode assembly 22 facing the insulating component 2122. On a plane perpendicular to the thickness direction of the end cap assembly 212, the orthographic projection of the storage component 60 does not overlap with the orthographic projection of the electrode tab 222.

[0220] It should be understood that the orthographic projection of the storage component 60 and the orthographic projection of the electrode tab 222 do not overlap on a plane perpendicular to the thickness direction of the end cap assembly 212. This can mean that during the processing, manufacturing and assembly of the battery cell 20, the mutual influence between the storage component 60 and the electrode tab 222 is reduced, so as to balance the assembly performance and performance of the storage component 60, and at the same time improve the performance of the battery cell 20.

[0221] In this embodiment, by providing an electrode tab 222 on the side of the electrode assembly 22 facing the insulating component 2122, and ensuring that the orthographic projection of the storage component 60 and the orthographic projection of the electrode tab 222 do not overlap on a plane perpendicular to the thickness direction of the end cap assembly 212, the mutual influence between the storage component 60 and the electrode tab 222 is reduced, thereby balancing the assembly performance and usability of the storage component 60 and improving the usability of the battery cell 20.

[0222] Figure 15 A cross-sectional schematic diagram of an insulating component 2122 provided in an embodiment of this application is shown.

[0223] In some implementations, such as Figure 15 As shown, the insulating component 2122 also includes an extension 2124, which is connected to the first surface 2123 and extends toward the electrode assembly 22. Along the thickness direction of the end cap assembly 212, the maximum size of the extension 2124 is greater than or equal to the maximum size of the storage component 60. The first surface 2123 is the surface of the insulating component 2122 facing the electrode assembly 22.

[0224] Exemplary, along the thickness direction of the end cap assembly 212, the size and number of the extensions 2124 in this embodiment can be set according to actual needs. Exemplary, such as Figure 15 As shown, the first surface 2123 of the insulating component 2122 may be provided with three extensions 2124.

[0225] It should be understood that the maximum size of the extension 2124 along the thickness direction of the end cap assembly 212 is greater than or equal to the maximum size of the storage component 60. This can mean that during the processing, manufacturing and assembly of the battery cell 20, the mutual influence between the extension 2124 and the storage component 60 is reduced, so as to take into account both the assembly performance and the performance of the storage component 60, and at the same time improve the performance of the battery cell 20.

[0226] In this embodiment, by including an extension 2124 in the insulating component 2122, the extension 2124 is connected to the first surface 2123 and extends toward the electrode assembly 22. Along the thickness direction of the end cap assembly 212, the maximum size of the extension 2124 is greater than or equal to the maximum size of the storage component 60, so as to reduce the mutual influence between the extension 2124 and the storage component 60, so as to balance the assembly performance and use performance of the storage component 60, thereby improving the use performance of the battery cell 20.

[0227] According to some embodiments of this application, this application also provides a battery device 10, including a plurality of battery cells 20, wherein the battery cell 20 is the battery cell 20 in any of the above embodiments.

[0228] According to some embodiments of this application, this application also provides an electrical device, including the battery device 10 in any of the above embodiments, the battery device 10 being used to provide electrical energy to the electrical device. Specifically, the electrical device can be the above... Figure 1 The vehicle 1 shown can also be any electrical device that uses the battery device 10.

[0229] The power supply device can be any of the aforementioned devices or systems that utilize battery device 10.

[0230] According to some embodiments of this application, this application also provides an energy storage device, including the battery device 10 in any of the above embodiments, the battery device 10 being used to store electrical energy for the energy storage device.

[0231] Based on some embodiments of this application, see again the above. Figure 6 to Figure 15 A battery cell 20 is provided, comprising: a housing 211, an electrode assembly 22, an end cap assembly 212, a storage component 60, and a hydrogen storage alloy 80. The housing 211 includes a first receiving cavity 50 with an opening at one end, the electrode assembly 22 is received in the first receiving cavity 50, the end cap assembly 212 covers the opening, the end cap assembly 212 includes an end cap 2121 and an insulating component 2122, the insulating component 2122 is located between the end cap 2121 and the electrode assembly 22, the storage component 60 is fixedly connected to the insulating component 2122, the storage component 60 forms a second receiving cavity 70, or the storage component 60 and the insulating component 2122 together form a second receiving cavity 70, and the hydrogen storage alloy 80 is disposed in the second receiving cavity 70. The battery cell 20 includes an electrolyte, which includes a solvent, including at least one of an ether solvent or an ester solvent. The electrode assembly 22 includes a negative electrode, which includes a negative current collector and an active material layer disposed on at least one side of the negative current collector, the active material layer including an elemental active metal. The storage component 60 has a first engaging portion 630 on the side facing the insulating component 2122, and a second engaging portion 640 on the side facing the storage component 60 of the insulating component 2122, the first engaging portion 630 and the second engaging portion 640 engaging with each other. The storage component 60 is fixedly connected to the first surface 2123 of the insulating component 2122 on the side facing the electrode assembly 22.

[0232] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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, characterized in that, include: The housing (211) includes a first receiving cavity (50) having an opening at one end; Electrode assembly (22) is housed in the first receiving cavity (50); An end cap assembly (212) covers the opening, the end cap assembly (212) including an end cap (2121) and an insulating component (2122) located between the end cap (2121) and the electrode assembly (22); Storage component (60) is fixedly connected to the insulating component (2122). The storage component (60) forms a second receiving cavity (70), or the storage component (60) and the insulating component (2122) together form a second receiving cavity (70). Hydrogen storage alloy (80) is disposed in the second receiving cavity (70).

2. The battery cell according to claim 1, characterized in that, The battery cell includes an electrolyte, and the electrolyte includes a solvent, which includes an ether solvent or an ester solvent. The electrode assembly includes a negative electrode sheet, the negative electrode sheet includes a negative current collector and an active material layer disposed on at least one side of the negative current collector, the active material layer including an elemental active metal.

3. The battery cell according to claim 2, characterized in that, The storage component (60) has a first latching portion (630) on the side facing the insulating component (2122), and the insulating component (2122) has a second latching portion (640) on the side facing the storage component (60). The first latching portion (630) and the second latching portion (640) latch each other.

4. The battery cell according to claim 3, characterized in that, The first snap-fit ​​portion (630) includes a protrusion structure (631) protruding toward the insulating member (2122), and the second snap-fit ​​portion (640) includes a groove structure (641) with an opening toward the electrode assembly (22), at least a portion of the protrusion structure (631) being received in the groove structure (641).

5. The battery cell according to claim 2, characterized in that, The storage component (60) is fixedly connected to the first surface (2123) of the insulating component (2122) facing the electrode assembly (22).

6. The battery cell according to claim 5, characterized in that, The storage component (60) includes a first connecting part (610) and a second connecting part (620). The second connecting part (620) is disposed between the first connecting part (610) and the first surface (2123). The first connecting part (610), the second connecting part (620) and the first surface (2123) together form the second receiving cavity (70).

7. The battery cell according to claim 6, characterized in that, The first connecting portion (610) is provided with at least one first through hole (611) extending through the thickness direction of the first connecting portion (610), and the second receiving cavity (70) communicates with the receiving cavities other than the second receiving cavity (70) in the first receiving cavity (50) through the first through hole (611).

8. The battery cell according to claim 7, characterized in that, In the thickness direction perpendicular to the first connecting portion (610), the minimum size of the hydrogen storage alloy (80) is greater than the maximum size of the first through hole (611).

9. The battery cell according to claim 6, characterized in that, The second connecting portion (620) is provided with at least one second through hole (621) extending through the thickness direction of the second connecting portion (620), and the second receiving cavity (70) communicates with the receiving cavities other than the second receiving cavity (70) in the first receiving cavity (50) through the second through hole (621).

10. The battery cell according to claim 9, characterized in that, In the thickness direction perpendicular to the second connection portion (620), the minimum size of the hydrogen storage alloy (80) is greater than the maximum size of the second through hole (621).

11. The battery cell according to claim 2, characterized in that, The active metal element includes one of the following: lithium, sodium, potassium, zinc, and aluminum.

12. The battery cell according to any one of claims 1 to 11, characterized in that, The hydrogen storage alloy (80) includes one of the following: zirconium alloy, magnesium alloy, titanium alloy, and vanadium alloy.

13. The battery cell according to any one of claims 1 to 11, characterized in that, The electrode assembly (22) has an electrode tab (222) on the side facing the insulating component (2122). On a plane perpendicular to the thickness direction of the end cap assembly (212), the orthographic projection of the storage component (60) does not overlap with the orthographic projection of the electrode tab (222).

14. The battery cell according to any one of claims 1 to 11, characterized in that, The insulating component (2122) further includes an extension (2124) connected to the first surface (2123) and extending toward the electrode assembly (22) along the thickness direction of the end cap assembly (212). The maximum size of the extension (2124) is greater than or equal to the maximum size of the storage component (60). The first surface (2123) is the surface of the insulating component (2122) facing the electrode assembly (22).

15. A battery device, characterized in that, include: Multiple battery cells, wherein the battery cells are as described in any one of claims 1 to 14.

16. An electrical appliance, characterized in that, include: The battery device of claim 15, wherein the battery device is used to provide electrical energy to the electrical device.

17. An energy storage device, characterized in that, include: The battery device of claim 15, wherein the battery device is used to store electrical energy for the energy storage device.

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