Battery cell, battery apparatus, electrical apparatus and energy storage apparatus

Abstract

Provided in the embodiments of the present application are a battery cell, a battery apparatus, an electrical apparatus and an energy storage apparatus. The present application can improve the use performance of the battery cell. The battery cell comprises: an electrode assembly, a casing, a pressure relief mechanism and a support plate assembly; the casing comprises a first accommodating space, the electrode assembly being accommodated in the first accommodating space; the casing comprises a first wall, the first wall being provided with a pressure relief hole passing through the first wall, and the pressure relief hole leading to the first accommodating space; the pressure relief mechanism is accommodated in the pressure relief hole and connected to the casing; the support plate assembly is fixed in a space between the electrode assembly and the first wall; the support plate assembly comprises a main body part and support parts, the support parts being located at the side of the main body part facing away from the electrode assembly, wherein a gas discharge channel leading to the pressure relief mechanism is formed between the main body part and the first wall, and the melting point of the material of the support parts is higher than the melting point of the material of the main body part.

Description

Battery cells, battery devices, electrical devices, and energy storage devices 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 that cannot be ignored. For example, there are issues such as the detachment or vibration of internal structures within battery cells at high temperatures. If the safety of a battery device cannot be guaranteed, it becomes unusable, reducing its performance. Therefore, improving the performance of individual battery cells has become a pressing technical problem to be solved in this field.

[0004] Summary of the Invention

[0005] 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.

[0006] In a first aspect, this application provides a battery cell comprising: an electrode assembly; a housing including a first receiving space, the electrode assembly being received in the first receiving space, the housing having a first wall, the first wall having a pressure relief hole penetrating the first wall and communicating with the first receiving space; a pressure relief mechanism being received in the pressure relief hole and connected to the housing; and a support plate assembly fixed in the space between the electrode assembly and the first wall, the support plate assembly including a main body and a support portion, the support portion being located on the side of the main body opposite to the electrode assembly, and an exhaust channel communicating with the pressure relief mechanism being formed between the main body and the first wall; wherein the melting point of the material of the support portion is greater than the melting point of the material of the main body.

[0007] In this embodiment, the pressure relief mechanism is configured as a pressure relief hole housed in the first wall, and the battery cell also includes a support plate assembly. The support plate assembly is fixed in the space between the electrode assembly and the first wall. The support plate assembly includes a main body and a support part. The support part is located on the side of the main body away from the electrode assembly, and an exhaust channel communicating with the pressure relief mechanism is formed between the main body and the first wall. The melting point of the material of the support part is greater than that of the material of the main body, so that in the event of thermal runaway of the battery cell, the electrode assembly can be supported by the support part to reduce the impact on the exhaust function of the battery cell. This balances the pressure relief performance of the battery cell and the structural strength of the support plate assembly, thereby improving the performance of the battery cell.

[0008] In some embodiments, the material of the support portion has a melting point greater than or equal to 200°C. Thus, in this embodiment, by setting the melting point of the material of the support portion to be greater than or equal to 200°C, the electrode assembly can be effectively supported by the support portion in the event of thermal runaway of the battery cell, thereby reducing the impact on the venting function of the battery cell, improving the pressure relief performance of the battery cell and the structural strength of the support plate assembly, and thus improving the performance of the battery cell.

[0009] In some embodiments, the main body includes a first main body and a first extension, the first extension being connected to the side of the first main body facing the first wall, and the first extension covering at least a portion of the surface of the support away from the first main body.

[0010] In this embodiment of the application, by configuring the main body to include a first main body and a first extension, and the first extension being connected to the side of the first main body facing the first wall, and the first extension covering at least a portion of the surface of the support away from the first main body, the connection strength between the main body and the support is improved. In the event of thermal runaway of the battery cell, the risk of the main body and the support of the tray assembly falling off due to high temperature is reduced, thereby improving the performance of the battery cell.

[0011] In some embodiments, the first extension covers the entire surface of the support portion away from the first main body portion.

[0012] In this embodiment, by setting the first extension to cover the entire surface of the support portion away from the first main body portion, the connection strength between the main body portion and the support portion is further improved. In the event of thermal runaway of the battery cell, the risk of the main body portion and the support portion of the tray assembly falling off due to high temperature is effectively reduced, thereby improving the performance of the battery cell.

[0013] In some embodiments, the support portion is provided with a first groove opening toward the first main body portion, and / or, the support portion is provided with a first through hole penetrating the support portion along the thickness direction of the support portion, wherein the main body portion includes a second extension portion connected to the side of the first main body portion facing the first wall, at least a portion of the second extension portion is received in the first groove, and / or, at least a portion of the second extension portion is received in the first through hole.

[0014] In this embodiment, by providing a first groove with an opening facing the first main body on the support portion, and / or providing a first through hole penetrating the support portion along the thickness direction of the support portion, and providing a second extension portion, at least a portion of the second extension portion being accommodated in the first groove, and / or at least a portion of the second extension portion being accommodated in the first through hole, the connection strength between the main body portion and the support portion can be effectively improved. In the event of thermal runaway of the battery cell, the risk of the main body portion and the support portion of the tray assembly falling off due to high temperature can be effectively reduced, thereby improving the performance of the battery cell.

[0015] In some embodiments, the first groove and / or the first through hole gradually increase in size in the direction perpendicular to the thickness of the body portion, along the thickness of the body portion and toward the first wall.

[0016] In this embodiment, along the thickness of the main body and toward the first wall, the size of the first groove and / or the first through hole is set to gradually increase in the direction perpendicular to the thickness of the main body, and at least part of the second extension is accommodated in the first groove and / or the second extension is accommodated in the first through hole. This can further improve the connection strength between the main body and the support, and in the event of thermal runaway of the battery cell, effectively reduce the risk of the main body and the support of the tray assembly falling off due to high temperature, thereby improving the performance of the battery cell.

[0017] In some embodiments, the main body and the support are integrally injection molded.

[0018] In this embodiment of the application, by integrally injection molding the main body and the support, the structural strength between the main body and the support of the pallet assembly can be improved, as well as the product consistency can be improved, while reducing processing and manufacturing costs.

[0019] In some embodiments, the minimum thickness of the pallet assembly is greater than or equal to 0.1 mm.

[0020] In this embodiment, by setting the minimum thickness of the pallet assembly to be greater than or equal to 0.1 mm, the integral injection molding between the main body and the support part is facilitated, thereby improving the yield and product consistency of the pallet assembly.

[0021] In some embodiments, the battery cell further includes an insulating member that forms a second receiving space with the main body, the electrode assembly is received in the second receiving space, the surface of the support portion opposite to the main body is fixedly connected to the surface of the first wall facing the inside of the battery cell, and the surface of the main body portion opposite to the electrode assembly abuts against the surface of the support portion opposite to the first wall.

[0022] In this embodiment, by providing an insulating member in the battery cell, the insulating member and the main body form a second accommodating space, and the electrode assembly is accommodated in the second accommodating space. The surface of the support portion away from the main body is fixedly connected to the surface of the first wall facing the inside of the battery cell, and the surface of the main body away from the electrode assembly abuts against the surface of the support portion away from the first wall. That is, the main body is connected to the insulating member, and the support portion is fixedly connected to the first wall. In the event of thermal runaway of the battery cell, the risk of the main body or support portion of the tray assembly falling off due to high temperature is effectively reduced, so as to balance the pressure relief performance and manufacturing performance of the battery cell, thereby improving the performance of the battery cell.

[0023] In some embodiments, the main body is integrally formed with the insulating member.

[0024] In this embodiment, by integrally molding the main body and the insulating component, the product consistency of the insulating component is improved, while the processing and manufacturing costs are reduced.

[0025] In some embodiments, the surface of the support portion facing away from the main body portion is welded to the surface of the first wall facing the interior of the battery cell.

[0026] In this embodiment, by setting the surface of the support part away from the main body to be welded to the surface of the first wall facing the inside of the battery cell, the connection strength between the support part and the first wall is effectively improved. In the event of thermal runaway of the battery cell, the risk of the support part of the tray assembly falling off due to high temperature is effectively reduced, thereby improving the performance of the battery cell.

[0027] In some embodiments, the main body portion further includes an exhaust hole extending through the main body portion along its thickness direction, wherein the orthographic projection of the exhaust hole does not overlap with the orthographic projection of the support portion on a plane perpendicular to the thickness direction of the main body portion.

[0028] In this embodiment, by providing an exhaust hole that penetrates the main body along its thickness direction, and ensuring that the orthographic projection of the exhaust hole does not overlap with the orthographic projection of the support portion on a plane perpendicular to the thickness direction of the main body, in the event of thermal runaway of the battery cell, the high-temperature and high-pressure gas generated by the electrode assembly can sequentially pass through the exhaust hole and the exhaust channel between the support plate assembly and the first wall, and be smoothly discharged to the outside of the battery cell through the pressure relief mechanism, thereby improving the pressure relief performance of the battery cell and thus improving the performance of the battery cell.

[0029] In some embodiments, the material of the support includes at least one of the following: aluminum, copper, and stainless steel.

[0030] In this embodiment of the application, the support part is made of at least one of the following materials: aluminum, copper, and stainless steel, so as to improve the support strength of the support part, so as to form an exhaust channel communicating with the pressure relief mechanism between the tray assembly and the first wall, thereby improving the pressure relief performance of the battery cell.

[0031] In some embodiments, the material of the body portion includes polypropylene or polyethylene terephthalate.

[0032] In this embodiment, by setting the material of the main body to include polypropylene or polyethylene terephthalate, the surface of the electrode assembly facing the main body is insulated, thereby reducing the risk of short circuit in the battery cell and improving the performance of the battery cell.

[0033] In some embodiments, the housing is made of steel or titanium.

[0034] In this embodiment of the application, by setting the material of the casing to include steel or titanium, the structural strength and high-temperature performance of the battery cell can be effectively improved when the battery cell is a high-nickel, high-silicon system, so as to balance the pressure relief performance and performance of the battery cell in the event of thermal runaway.

[0035] 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.

[0036] Thirdly, an electrical device is provided, including the battery device described in the first aspect, the battery device being used to provide electrical energy to the electrical device.

[0037] In some implementations, the electrical device can be a vehicle, ship, or spacecraft.

[0038] 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

[0039] 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.

[0040] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application.

[0041] Figure 2 is a schematic diagram of the structure of a battery device provided in an embodiment of this application.

[0042] Figure 3 is a schematic diagram of the structure of a battery cell provided in an embodiment of this application.

[0043] Figure 4 is an exploded structural diagram of a battery cell provided in another embodiment of this application.

[0044] Figure 5 is a partial exploded structural diagram of a battery cell provided in an embodiment of this application.

[0045] Figure 6 is a cross-sectional schematic diagram of a battery cell provided in an embodiment of this application.

[0046] Figure 7 is a schematic diagram of the structure of a pallet assembly provided in an embodiment of this application.

[0047] Figure 8 is a cross-sectional schematic diagram of a pallet assembly provided in an embodiment of this application.

[0048] Figure 9 is a cross-sectional schematic diagram of a pallet assembly provided in another embodiment of this application.

[0049] Figure 10 is a partial cross-sectional schematic diagram of a pallet assembly provided in an embodiment of this application.

[0050] Figure 11 is a partial cross-sectional schematic diagram of a pallet assembly provided in another embodiment of this application.

[0051] Figure 12 is a partial cross-sectional schematic diagram of a pallet assembly provided in another embodiment of this application.

[0052] Figure 13 is a partial cross-sectional schematic diagram of a pallet assembly provided in another embodiment of this application.

[0053] Figure 14 is a partial cross-sectional schematic diagram of a pallet assembly provided in another embodiment of this application.

[0054] Figure 15 is a partial cross-sectional schematic diagram of a pallet assembly provided in another embodiment of this application.

[0055] Figure 16 is a partial cross-sectional schematic diagram of a pallet assembly provided in another embodiment of this application.

[0056] Figure 17 is a partial cross-sectional schematic diagram of a pallet assembly provided in another embodiment of this application.

[0057] Figure 18 is a partial cross-sectional schematic diagram of a pallet assembly provided in another embodiment of this application.

[0058] Figure 19 is a partial cross-sectional schematic diagram of a pallet assembly provided in another embodiment of this application.

[0059] 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-Cover plate; 213-Pressure relief mechanism; 222a-Positive electrode tab; 222b-Negative electrode tab; 214-Electrode terminal; 214a-Positive electrode terminal ; 214b - Negative electrode terminal; 23 - Support plate assembly; 24 - Insulator; 25 - Liquid injection hole; 231 - Main body; 232 - Support part; 2311 - First main body; 2312 - First extension; 2313 - Second extension; 233 - Vent hole; 234 - First groove; 235 - First through hole; 236 - Positioning hole; 50 - First wall; 60 - Pressure relief hole; 26 - First receiving space; 27 - Second receiving space; 70 - Protective component.

[0060] The accompanying drawings are not drawn to scale. Detailed Implementation

[0061] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0069] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0070] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0071] 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.

[0072] 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.

[0073] 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.).

[0074] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, 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.

[0075] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0076] 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.).

[0077] 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.

[0078] 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.

[0079] 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.

[0080] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0081] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0082] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0083] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] Liquid electrolytes include electrolyte salts and solvents.

[0089] 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.

[0090] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0091] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0092] As an example, the polymers of polymer solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0093] 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-sulfur, sulfosilium-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0094] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0095] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0096] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0097] In some implementations, the electrode assembly is a stacked structure.

[0098] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0099] 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.

[0100] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0101] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0102] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0103] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0111] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0128] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] 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.

[0134] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0135] 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, such as the potential for structural detachment or vibration within battery cells at high temperatures. For example, in the case of thermal runaway within a high-nickel, high-silicon battery device, the internal temperature can rapidly reach over 500°C. Since existing support structures within battery cells are typically formed by bonding insulating plates and metal blocks, these components are prone to detachment at high temperatures, affecting the performance of the battery cells and impacting the safety and industrial feasibility of the entire battery device. If the safety of the battery device cannot be guaranteed, it becomes unusable, reducing its performance. Therefore, improving the performance of battery cells has become a pressing technical problem in this field.

[0136] Therefore, embodiments of this application provide a battery cell, a battery device, an electrical device, and an energy storage device. The battery cell includes: an electrode assembly, a housing, a pressure relief mechanism, and a tray assembly. The housing includes a first receiving space, in which the electrode assembly is received. The housing has a first wall, and the first wall is provided with a pressure relief hole penetrating the first wall and communicating with the first receiving space. The pressure relief mechanism is received in the pressure relief hole and connected to the housing. The tray assembly is fixed in the space between the electrode assembly and the first wall. The tray assembly includes a main body and a support portion. The support portion is located on the side of the main body away from the electrode assembly. An exhaust channel communicating with the pressure relief mechanism is formed between the main body and the first wall. The melting point of the material of the support portion is greater than that of the material of the main body. Thus, in this embodiment of the application, by setting the pressure relief mechanism as a pressure relief hole accommodated in the first wall, and the battery cell further includes a support plate assembly, the support plate assembly is fixed in the space between the electrode assembly and the first wall, the support plate assembly includes a main body and a support part, the support part is located on the side of the main body away from the electrode assembly, and an exhaust channel communicating with the pressure relief mechanism is formed between the main body and the first wall, and the melting point of the material of the support part is greater than that of the material of the main body, so that in the event of thermal runaway of the battery cell, the electrode assembly can be supported by the support part to reduce the impact on the exhaust function of the battery cell, and to balance the pressure relief performance of the battery cell and the structural strength of the support plate assembly, thereby improving the performance of the battery cell.

[0137] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0138] Electrical equipment 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 equipment.

[0139] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical equipment 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 electrical equipment.

[0140] For example, as shown in Figure 1, which is a structural schematic diagram of a vehicle 1 according to an embodiment of this application, vehicle 1 can be a gasoline vehicle, a natural gas 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 is used to control 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, for the electrical system of vehicle 1, such as for the power requirements of vehicle 1's 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.

[0141] 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.

[0142] For example, as shown in Figure 2, which is a structural schematic diagram of a battery device 10 according to an embodiment of this application, the battery device 10 may include a plurality of battery cells 20. The battery device 10 may also include a housing 11 (or cover), the housing 11 having a hollow structure, and the plurality of battery cells 20 are housed within the housing 11. For example, the plurality of battery cells 20 may be connected in parallel, in series, or in a mixed configuration and then placed within the housing 11.

[0143] As shown in Figure 2, the housing 11 may include two parts, referred to here as the first structure 111 and the second structure 112, which are fastened together. The shapes of the first structure 111 and the second structure 112 can be determined according to the combined shape of multiple battery cells 20. Both the first structure 111 and the second structure 112 may have an opening. For example, both the first structure 111 and the second structure 112 can be hollow cuboids with only one open face. The openings of the first structure 111 and the second structure 112 are arranged opposite to each other, and the first structure 111 and the second structure 112 are fastened together to form a housing 11 with a closed cavity. The second structure 112 may include a bottom plate 112a, a side plate 112b, and a beam. 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 structure 111 and the second structure 112.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] Figure 3 shows a structural schematic diagram of a battery cell 20 provided in one embodiment of this application, and Figure 4 shows an exploded structural schematic diagram of a battery cell 20 provided in another embodiment of this application. As shown in Figures 3 and 4, the battery cell 20 of 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 a cover plate 212. The shell 211 is a hollow structure with at least one opening; the cover plate 212 is used to fasten with the shell 211 to form a housing 21 with a closed receiving space.

[0148] In some embodiments, the cover plate 212 may be a plate-like structure used to cover the opening of the housing 211. In other embodiments, the cover plate 212 has a similar structure to the housing 211, that is, both the housing 211 and the cover plate 212 are hollow structures with one opening, and the two openings are joined together to form an outer shell 21 with a closed accommodating space.

[0149] It should be understood that if the cover plate 212 is a plate-shaped structure, the shell 211 can be a hollow structure with an opening at one or more ends. For example, if the shell 211 is a hollow structure with an opening at one end, the cover plate 212 can be set as one; if the shell 211 is a hollow structure with openings at opposite ends, the cover plate 212 can be set as two, and the two cover plates 212 respectively cover the openings at both ends of the shell 211.

[0150] The outer shell 21 can be of various shapes, such as a cylinder, a cuboid, or other polyhedrons. For example, as shown in Figures 3 and 4, in this embodiment of the application, the outer shell 21 is mainly described as a cuboid structure.

[0151] It should be understood that the cover plate 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 cover plate 212 can be adapted to the shape of the housing 211, as shown in Figures 3 and 4. The housing 211 is a cuboid structure, and the cover plate 212 is a rectangular plate structure adapted to the housing 211.

[0152] In some embodiments, the housing 211 may be a hollow structure with an opening at at least one end, and the shape of the cover plate 212 may be adapted to the shape of the housing 211. The cover plate 212 is used to cover the opening of the housing 211 so that the housing 21 isolates the internal environment of the battery cell 20 from the external environment. If the housing 211 is a hollow structure with an opening at one end, the cover plate 212 may be provided as one.

[0153] The shell 211 in this embodiment may be made of one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The cover plate 212 may also be made of one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate 212 may be the same as or different from that of the shell 211; the materials of the different walls of the shell 211 may also be the same or different.

[0154] The cover plate 212 in this embodiment can be any wall of the outer shell 21. For example, the cover plate 212 can be the wall with the largest area among the multiple walls included in the outer shell 21, or the wall with the smallest area, or it can be other walls. This embodiment is not limited to this. Alternatively, the cover plate 212 can also be other structures. For example, the cover plate 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.

[0155] 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 electrical energy from the battery cell 20. As shown in Figures 3 and 4, the battery cell 20 may include at least two electrode terminals 214, which may include at least one positive electrode terminal 214a and at least one negative electrode terminal 214b. The positive electrode terminal 214a is used for electrical connection with the positive electrode tab 222a of the electrode assembly 22, and the negative electrode terminal 214b is used for electrical connection with the negative electrode tab 222b of the electrode assembly 22. The positive electrode terminal 214a and the positive electrode tab 222a can be directly connected or indirectly connected, and the negative electrode terminal 214b and the negative electrode tab 222b can be directly connected or indirectly connected. For example, the positive electrode terminal 214a can be electrically connected to the positive electrode tab 222a through a connecting member (not shown in the figure), and the negative electrode terminal 214b can be electrically connected to the negative electrode tab 222b through a connecting member.

[0156] In this embodiment, the walls of the housing 211 and the cover plate 212 are both referred to as the walls of the battery cell 20. For the cuboid battery cell 20 shown in Figures 3 and 4, the walls of the housing 211 include a bottom wall and four side walls. The shape of the housing 211 depends on the shape of the combined 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 so that one or more electrode assemblies 22 can be placed inside the housing 211. For example, when the housing 211 is a hollow cuboid or cube, one plane of the housing 211 is an open face, that is, this plane does not have a 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, that is, this end face does not have a wall, allowing communication between the inside and outside of the housing 211. The cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The casing 211 is filled with an electrolyte, such as an electrolyte solution.

[0157] In some implementations, the battery cell 20 further includes a tray assembly 23 disposed inside the housing 211, with the side of the tray assembly 23 away from the electrode assembly 22 attached to the side of the bottom wall of the housing 211 facing the electrode assembly 22. Exemplarily, the tray assembly 23 may be fixedly connected to or not fixedly connected to the side of the bottom wall of the housing 211 facing the electrode assembly 22; for example, the side of the tray assembly 23 away from the electrode assembly 22 may be bonded to the side of the bottom wall of the housing 211 facing the electrode assembly 22.

[0158] In some implementations, the cover plate 212 of the battery cell 20 is provided with an injection hole 25, through which electrolyte is injected into the battery cell 20 to replenish the electrolyte in the battery cell 20.

[0159] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on the actual usage requirements, the electrode assembly 22 inside the casing 211 can be one or more. For example, as shown in Figure 4, 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 casing 211 can also be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the casing 211 can also be a cuboid structure.

[0160] In some implementations, the battery cell 20 may also include an insulating member 24 disposed within the receiving space of the housing 211. The insulating member 24 may be a hollow structure with openings at one or more ends. The receiving space within this hollow structure is used to accommodate the electrode assembly 22, thereby improving the insulation performance of the battery cell 20. It should also be understood that in some implementations, the battery cell 20 further includes an adhesive member, which may be disposed between the insulating member 24 and the support plate assembly 23 for fixedly connecting the insulating member 24 and the support plate assembly 23. For example, the adhesive member may be an L-shaped structure.

[0161] In some implementations, the battery cell 20 may also include other structures, which will not be described in detail here. For example, the battery cell 20 may also include a busbar (not shown in the figure), which is used to realize the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through the housing 11 through a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar.

[0162] Figure 5 shows an exploded structural diagram of a battery cell 20 according to another embodiment of this application. Figure 6 shows a cross-sectional schematic diagram of a battery cell 20 according to an embodiment of this application. Figure 7 shows a structural schematic diagram of a tray assembly 23 according to an embodiment of this application. Figure 8 shows a cross-sectional schematic diagram of a tray assembly 23 according to an embodiment of this application. Figure 9 shows a cross-sectional schematic diagram of a tray assembly 23 according to another embodiment of this application. Exemplarily, the cross-sectional schematic diagram of the tray assembly 23 shown in Figure 8 may be a cross-sectional schematic diagram of the tray assembly 23 facing away from the first wall 50 on a plane perpendicular to the thickness direction of the tray assembly 23. The cross-sectional schematic diagram of the tray assembly 23 shown in Figure 9 may be a cross-sectional schematic diagram of the tray assembly 23 facing the first wall 50 on a plane perpendicular to the thickness direction of the tray assembly 23.

[0163] In some implementations, as shown in Figures 5 to 9, the battery cell 20 includes: an electrode assembly 22, a housing 211, a pressure relief mechanism 213, and a support plate assembly 23; the housing 211 includes a first receiving space 26, in which the electrode assembly 22 is received; the housing 211 has a first wall 50, and the first wall 50 is provided with a pressure relief hole 60 penetrating the first wall 50, the pressure relief hole 60 communicating with the first receiving space 26; the pressure relief mechanism 213 is received within the pressure relief... The hole 60 is connected to the housing 211; the tray assembly 23 is fixed in the space between the electrode assembly 22 and the first wall 50. The tray assembly 23 includes a main body 231 and a support 232. The support 232 is located on the side of the main body 231 away from the electrode assembly 22. An exhaust channel communicating with the pressure relief mechanism 213 is formed between the main body 231 and the first wall 50; wherein, the melting point of the material of the support 232 is greater than the melting point of the material of the main body 231.

[0164] It should be understood that the battery cell 20 in this application embodiment can be a polyhedral structure of any shape, that is, the housing 211 in the battery cell 20 can include multiple walls, and the first wall 50 can be any one wall of the housing 211 of the battery cell 20, that is, the pressure relief mechanism 213 can be located on any one wall of the housing 211 of the battery cell 20.

[0165] For example, the first wall 50 may include, but is not limited to, the following: the first wall 50 may be the wall with the smallest area of ​​the housing 211 of the battery cell 20; the first wall 50 may also be the wall with the largest area of ​​the housing 211 of the battery cell 20; the first wall 50 may be the wall of the housing 211 of the battery cell 20 on which the electrode terminals 214 are provided; the first wall 50 may be the wall adjacent to the wall of the battery cell 20 on which the electrode terminals 214 are provided; the first wall may be the wall opposite to the wall of the battery cell 20 on which the electrode terminals 214 are provided.

[0166] It should also be understood that the first wall 50 is provided with a pressure relief hole 60, which communicates with the receiving cavity of the housing 211. In other words, a through-hole structure can be provided on the first wall 50 to serve as the pressure relief hole 60. The shape of the pressure relief hole 60 on the plane perpendicular to the thickness direction of the first wall 50 can be set according to actual needs. For example, the shape of the pressure relief hole 60 on the plane perpendicular to the thickness direction of the first wall 50 can be circular, elliptical, polygonal, rectangular, etc. As an example, this application embodiment does not limit this.

[0167] It should also be understood that the pressure relief mechanism 213 in this embodiment refers to an element or component that is actuated when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold to release the internal pressure or temperature. This threshold design varies depending on 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 20.

[0168] The term "actuation" as used in this application refers to the pressure relief mechanism 213 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the pressure relief mechanism 213 may include, but are not limited to, at least a portion of the pressure relief mechanism 213 rupturing, breaking, tearing, or opening. During the actuation process of the pressure relief mechanism 213, the high-temperature and high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as waste. This method enables the battery cell 20 to release pressure and temperature under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0169] The emissions from the battery cell 20 mentioned in this application embodiment include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0170] For example, the pressure relief mechanism 213 may be disposed on the bottom wall of the battery cell 20, or, for example, on the bottom wall of the housing 211. The pressure relief mechanism 213 can be various possible pressure relief mechanisms. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism 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 configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0171] It should also be understood that the battery cell 20 in this embodiment further includes a protective member 70, which is accommodated in the pressure relief hole 60 and connected to the housing 211. On a plane perpendicular to the thickness direction of the first wall 50, the orthographic projection of the protective member 70 can cover the orthographic projection of the pressure relief mechanism 213. The protective member 70 serves to protect the pressure relief mechanism 213, reducing the risk of wear or damage during use and improving the stability of the pressure relief mechanism 213. The material of the protective member 70 includes, but is not limited to, plastic, rubber, or silicone. The shape of the protective member 70 can be set according to actual needs; for example, the shape of the protective member 70 can be set according to the shape of the pressure relief mechanism 213.

[0172] It should also be understood that the first accommodating space 26 included in the housing 211 in the embodiments of this application can be used to accommodate the electrode assembly 22. The first accommodating space 26 can be an open accommodating space with an opening at one or both ends. Specifically, the first accommodating space 26 can be sealed by the cover plate 212.

[0173] It should also be understood that the space between the electrode assembly 22 and the first wall 50 where the tray assembly 23 is fixed means that, in the event of thermal runaway of the battery cell 20 or under different operating conditions, the main body 231 and the support 232 of the tray assembly 23 can be fixed inside the battery cell 20 without falling off or shaking. Furthermore, the main body 231 and the support 232 can be fixedly connected, or they can be in direct contact but not fixedly connected. It should also be understood that the surface of the tray assembly 23 is provided with at least one positioning hole 236 to facilitate the assembly of the tray assembly 23.

[0174] It should also be understood that the exhaust channel formed between the main body 231 and the first wall 50 and communicating with the pressure relief mechanism 213 means that in the event of thermal runaway of the battery cell 20, the high-temperature and high-pressure gas generated inside the battery cell 20 can be discharged to the outside of the battery cell 20 through the exhaust channel between the main body 231 and the first wall 50 and the pressure relief mechanism 213.

[0175] It should also be understood that the melting point of the material of the support portion 232 being greater than that of the material of the main body portion 231 means that in the event of thermal runaway of the battery cell 20, that is, as the internal temperature of the battery cell 20 rises and the main body portion 231 melts, the support portion 232 can support the electrode assembly 22 to reduce the impact on the venting function of the battery cell 20 and enable the pressure relief mechanism 213 to operate normally.

[0176] In this embodiment, the pressure relief mechanism 213 is configured as a pressure relief hole 60 housed in the first wall 50, and the battery cell 20 further includes a support plate assembly 23. The support plate assembly 23 is fixed in the space between the electrode assembly 22 and the first wall 50. The support plate assembly 23 includes a main body 231 and a support part 232. The support part 232 is located on the side of the main body 231 away from the electrode assembly 22, and the melting point of the material of the support part 232 is greater than the melting point of the material of the main body 231. An exhaust channel communicating with the pressure relief mechanism 213 is formed between the main body 231 and the first wall 50. In the event of thermal runaway of the battery cell 20, the support part 232 can support the electrode assembly 22 to reduce the impact on the exhaust function of the battery cell 20, thus balancing the pressure relief performance of the battery cell 20 and the structural strength of the support plate assembly 23, thereby improving the performance of the battery cell 20.

[0177] In some implementations, the melting point of the material of the support portion 232 is greater than or equal to 200°C. For example, the melting point of the material of the support portion 232 may be set to: 200°C, 250°C, 300°C, 350°C, 400°C, 450°C, 500°C, 550°C, 600°C, 650°C, 700°C, etc., or its value may be within the range obtained by any combination of the above two values.

[0178] In this embodiment, by setting the melting point of the material of the support portion 232 to be greater than or equal to 200°C, the electrode assembly 22 can be effectively supported by the support portion 232 in the event of thermal runaway of the battery cell 20, thereby reducing the impact on the venting function of the battery cell 20, improving the pressure relief performance of the battery cell 20 and the structural strength of the support plate assembly 23, and thus improving the performance of the battery cell 20.

[0179] Figure 10 shows a cross-sectional schematic diagram of a pallet assembly 23 provided in one embodiment of this application. Figure 11 shows a cross-sectional schematic diagram of a pallet assembly 23 provided in another embodiment of this application.

[0180] In some implementations, as shown in Figures 10 and 11, the main body 231 includes a first main body 2311 and a first extension 2312. The first extension 2312 is connected to the side of the first main body 2311 facing the first wall 50 and covers at least a portion of the surface of the support 232 away from the first main body 2311.

[0181] It should be understood that the first main body portion 2311 and the first extension portion 2312 in the embodiments of this application can be integrally formed or separately formed. When the first main body portion 2311 and the first extension portion 2312 are integrally formed, the main body portion 231 can be integrally injection molded, and the materials of the first main body portion 2311 and the first extension portion 2312 can be set to the same material. Alternatively, in some implementations, the first main body portion 2311, the first extension portion 2312 and the support portion 232 can be integrally injection molded.

[0182] In this embodiment, by configuring the main body 231 to include a first main body 2311 and a first extension 2312, and the first extension 2312 being connected to the side of the first main body 2311 facing the first wall 50, and the first extension 2312 covering at least a portion of the surface of the support 232 away from the first main body 2311, the connection strength between the main body 231 and the support 232 is improved. In the event of thermal runaway of the battery cell 20, the risk of the main body 231 and the support 232 of the tray assembly 23 being detached due to high temperature is reduced, thereby improving the performance of the battery cell 20.

[0183] In some implementations, as shown in FIG11, the first extension 2312 covers the entire surface of the support portion 232 that is away from the first main body portion 2311. Thus, in this embodiment of the application, by setting the first extension 2312 to cover the entire surface of the support portion 232 that is away from the first main body portion 2311, the connection strength between the main body portion 231 and the support portion 232 is further improved. In the event of thermal runaway of the battery cell 20, the risk of the main body portion 231 and the support portion 232 detaching due to high temperature is effectively reduced, thereby improving the performance of the battery cell 20.

[0184] Figure 12 shows a cross-sectional schematic diagram of a pallet assembly 23 provided in one embodiment of this application. Figure 13 shows a cross-sectional schematic diagram of a pallet assembly 23 provided in another embodiment of this application.

[0185] In some implementations, as shown in Figures 12 and 13, the support portion 232 is provided with a first groove 234 opening toward the first main body portion 2311, and / or, the support portion 232 is provided with a first through hole 235 penetrating the support portion 232 along its thickness direction. The main body portion 231 includes a second extension portion 2313 connected to the side of the first main body portion 2311 facing the first wall 50. At least a portion of the second extension portion 2313 is accommodated in the first groove 234, and / or, at least a portion of the second extension portion 2313 is accommodated in the first through hole 235.

[0186] It should be understood that the shape of the first groove 234 with an opening facing the first main body 2311 provided on the support portion 232 can be set according to actual needs. On a plane perpendicular to the thickness direction of the support portion 232, the shape of the first groove 234 can be circular, elliptical, polygonal, rectangular, etc. It should also be understood that the number of first grooves 234 provided on the support portion 232 can be set according to actual needs. For example, the support portion 232 can be provided with one or more of the above-mentioned first grooves 234.

[0187] It should also be understood that the shape of the first through hole 235 extending through the support portion 232 along its thickness direction can be configured according to actual needs. On a plane perpendicular to the thickness direction of the support portion 232, the shape of the first through hole 235 can be circular, elliptical, polygonal, rectangular, etc. It should also be understood that the number of first through holes 235 provided on the support portion 232 can be configured according to actual needs; for example, the support portion 232 can be provided with one or more of the aforementioned first through holes 235.

[0188] It should also be understood that the first main body 2311 and the second extension 2313 in the embodiments of this application can be integrally formed or separately formed. When the first main body 2311 and the second extension 2313 are integrally formed, the main body 231 can be integrally injection molded, and the materials of the first main body 2311 and the second extension 2313 can be set to the same material.

[0189] It should also be understood that at least a portion of the second extension 2313 being accommodated in the first groove 234, and / or at least a portion of the second extension 2313 being accommodated in the first through hole 235, can mean that the second extension 2313 is engaged, bonded, or interference-fitted with the first groove 234 and / or the first through hole 235. Alternatively, in some implementations, the first main body 2311, the second extension 2313, and the support 232 can be integrally injection molded.

[0190] In this embodiment, by providing a first groove 234 with an opening facing the first main body 2311 on the support portion 232, and / or providing a first through hole 235 penetrating the support portion 232 along the thickness direction of the support portion 232, and providing a second extension portion 2313 on the main body 231, at least a portion of the second extension portion 2313 being accommodated in the first groove 234, and / or at least a portion of the second extension portion 2313 being accommodated in the first through hole 235, the connection strength between the main body 231 and the support portion 232 can be effectively improved. In the event of thermal runaway of the battery cell 20, the risk of the main body 231 and the support portion 232 falling off due to high temperature can be effectively reduced, thereby improving the performance of the battery cell 20.

[0191] Figure 14 shows a cross-sectional schematic diagram of a pallet assembly 23 provided in one embodiment of this application. Figure 15 shows a cross-sectional schematic diagram of a pallet assembly 23 provided in another embodiment of this application. Figure 16 shows a cross-sectional schematic diagram of a pallet assembly 23 provided in one embodiment of this application. Figure 17 shows a cross-sectional schematic diagram of a pallet assembly 23 provided in another embodiment of this application.

[0192] In some implementations, as shown in Figures 14 to 17, the dimensions of the first groove 234 and / or the first through hole 235 gradually increase in the direction perpendicular to the thickness of the main body 231 and toward the first wall 50.

[0193] It should be understood that the gradual increase in the size of the first groove 234 and / or the first through hole 235 in the direction perpendicular to the thickness of the main body 231 can mean, as shown in Figures 14 and 15, that the size of the first groove 234 and / or the first through hole 235 increases continuously in the direction perpendicular to the thickness of the main body 231; or, as shown in Figures 16 and 17, that the size of the first groove 234 and / or the first through hole 235 increases in a stepped manner in the direction perpendicular to the thickness of the main body 231.

[0194] In this embodiment, along the thickness of the main body 231 and toward the first wall 50, the dimensions of the first groove 234 and / or the first through hole 235 are set to gradually increase in the direction perpendicular to the thickness of the main body 231, and at least a portion of the second extension 2313 is accommodated in the first groove 234 and / or at least a portion of the second extension 2313 is accommodated in the first through hole 235. This can further improve the connection strength between the main body 231 and the support 232, and in the event of thermal runaway of the battery cell 20, effectively reduce the risk of the main body 231 and the support 232 of the tray assembly 23 falling off due to high temperature, thereby improving the performance of the battery cell 20.

[0195] Figure 18 shows a cross-sectional schematic diagram of a pallet assembly 23 provided in one embodiment of this application. Figure 19 shows a cross-sectional schematic diagram of a pallet assembly 23 provided in another embodiment of this application.

[0196] In some implementations, as shown in FIG18, the support portion 232 of the pallet assembly 23 shown in FIG18 is provided with a first groove 234 opening toward the first main body portion 2311, and the main body portion 231 includes a first main body portion 2311 and a second extension portion 2313. The second extension portion 2313 is connected to the side of the first main body portion 2311 facing the first wall 50, and at least a portion of the second extension portion 2313 is accommodated in the first groove 234. The main body portion 231 also includes a first extension portion 2312, which is connected to the side of the first main body portion 2311 facing the first wall 50 and covers the entire surface of the support portion 232 away from the first main body portion 2311.

[0197] In some implementations, as shown in FIG19, the support portion 232 of the pallet assembly 23 shown in FIG19 is provided with a first through hole 235 extending through the support portion 232 along the thickness direction of the support portion 232, and the main body portion 231 includes a first main body portion 2311 and a second extension portion 2313. The second extension portion 2313 is connected to the side of the first main body portion 2311 facing the first wall 50, and at least a portion of the second extension portion 2313 is accommodated in the first through hole 235. The main body portion 231 also includes a first extension portion 2312, which is connected to the side of the first main body portion 2311 facing the first wall 50 and covers the entire surface of the support portion 232 away from the first main body portion 2311.

[0198] In some implementations, the main body 231 and the support 232 are integrally injection molded. For example, as shown in Figures 10 and 11, the first main body 2311, the first extension 2312, and the support 232 can be integrally injection molded. As shown in Figures 12 to 17, the first main body 2311, the second extension 2313, and the support 232 can be integrally injection molded. As shown in Figures 18 and 19, the first main body 2311, the first extension 2312, the second extension 2313, and the support 232 can be integrally injection molded.

[0199] In this embodiment of the application, by integrally injection molding the main body 231 and the support 232, the structural strength between the main body 231 and the support 232 of the pallet assembly 23 can be improved, as well as the product consistency can be improved, while reducing processing and manufacturing costs.

[0200] In some implementations, the minimum thickness of the pallet assembly 23 is greater than or equal to 0.1 mm.

[0201] For example, the minimum thickness of the pallet assembly 23 can be set to: 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, etc., or its value is within the range obtained by any combination of the above two values.

[0202] In this embodiment of the application, by setting the minimum thickness of the pallet assembly 23 to be greater than or equal to 0.1 mm, the integral injection molding between the main body 231 and the support 232 is facilitated, thereby improving the yield and product consistency of the pallet assembly 23.

[0203] In some implementations, as shown in FIG4, the battery cell 20 further includes an insulating member 24, which together with the main body 231 forms a second receiving space 27. The electrode assembly 22 is received in the second receiving space 27. The surface of the support portion 232 facing away from the main body 231 is fixedly connected to the surface of the first wall 50 facing the interior of the battery cell 20. The surface of the main body 231 facing away from the electrode assembly 22 abuts against the surface of the support portion 232 facing away from the first wall 50.

[0204] It should be understood that the insulating member 24 in this embodiment may be a hollow insulating structure with openings at both ends. This hollow insulating structure is used to enclose the electrode assembly 22 to improve the insulation performance of the battery cell 20. The main body 231 may be located on the side of the electrode assembly 22 facing the first wall 50 and connected to the insulating member 24 to form a second receiving space 27 for accommodating the electrode assembly 22. It should also be understood that the insulating member 24 and the main body 231 may be integrally formed or separately formed. In the case where the insulating member 24 and the main body 231 are integrally formed, the insulating member 24 and the main body 231 may be integrally injection molded.

[0205] In this embodiment, by providing an insulating member 24 in the battery cell 20, the insulating member 24 and the main body 231 enclose a second receiving space 27, the electrode assembly 22 is accommodated in the second receiving space 27, the surface of the support portion 232 facing away from the main body 231 is fixedly connected to the surface of the first wall 50 facing the inside of the battery cell 20, and the surface of the main body 231 facing away from the electrode assembly 22 abuts against the surface of the support portion 232 facing away from the first wall 50. That is, the main body 231 is connected to the insulating member 24, and the support portion 232 is fixedly connected to the first wall 50. In the event of thermal runaway of the battery cell 20, the risk of the main body 231 or the support portion 232 of the tray assembly 23 falling off due to high temperature is effectively reduced, so as to balance the pressure relief performance and manufacturing performance of the battery cell 20, thereby improving the performance of the battery cell 20.

[0206] In some implementations, the main body 231 and the insulating member 24 are integrally formed. Exemplarily, the main body 231 and the insulating member 24 can be prepared by integral injection molding or thermoforming.

[0207] In this embodiment of the application, by integrally molding the main body 231 with the insulating member 24, the product consistency of the insulating member 24 is improved, while the processing and manufacturing costs are reduced.

[0208] In some implementations, the surface of the support portion 232 facing away from the main body 231 is welded to the surface of the first wall 50 facing inwards towards the battery cell 20. Thus, in this embodiment, by welding the surface of the support portion 232 facing away from the main body 231 to the surface of the first wall 50 facing inwards towards the battery cell 20, the connection strength between the support portion 232 and the first wall 50 is effectively improved. In the event of thermal runaway of the battery cell 20, the risk of the support portion 232 of the tray assembly 23 detaching due to high temperature is effectively reduced, thereby improving the performance of the battery cell 20.

[0209] In some implementations, as shown in Figures 7 to 9, the main body 231 also includes an exhaust hole 233 that extends through the main body 231 along its thickness direction. On a plane perpendicular to the thickness direction of the main body 231, the orthographic projection of the exhaust hole 233 does not overlap with the orthographic projection of the support 232.

[0210] It should be understood that in the event of thermal runaway of the battery cell 20, the high-temperature and high-pressure gas generated inside the battery cell 20 can sequentially enter the exhaust channel through the vent 233 and be discharged to the outside of the battery cell 20 through the pressure relief mechanism 213. It should also be understood that the shape of the vent 233 on a plane perpendicular to the thickness direction of the main body 231 can be circular, elliptical, polygonal, rectangular, etc. Furthermore, the number of vents 233 on the main body 231 can be set according to actual heat dissipation or pressure relief requirements.

[0211] In this embodiment, by providing an exhaust hole 233 that penetrates the main body 231 along its thickness direction, and by ensuring that the orthographic projection of the exhaust hole 233 does not overlap with the orthographic projection of the support portion 232 on a plane perpendicular to the thickness direction of the main body 231, in the event of thermal runaway of the battery cell 20, the high-temperature and high-pressure gas generated by the electrode assembly 22 can pass sequentially through the exhaust hole 233 and the exhaust channel between the support plate assembly 23 and the first wall 50, and be smoothly discharged to the outside of the battery cell 20 through the pressure relief mechanism 213, thereby improving the pressure relief performance of the battery cell 20 and thus improving the performance of the battery cell 20.

[0212] In some implementations, the material of the support 232 includes at least one of the following materials: aluminum, copper, and stainless steel.

[0213] In this embodiment of the application, the support strength of the support 232 is improved by setting the material of the support 232 to at least one of the following materials: aluminum, copper, and stainless steel, so as to form an exhaust channel communicating with the pressure relief mechanism 213 between the tray assembly 23 and the first wall 50, thereby improving the pressure relief performance of the battery cell 20.

[0214] In some implementations, the material of the main body 231 includes polypropylene or polyethylene terephthalate. Thus, in this embodiment, by setting the material of the main body 231 to include polypropylene or polyethylene terephthalate, the surface of the electrode assembly 22 facing the main body 231 is insulated, reducing the risk of short circuits in the battery cell 20 and improving the performance of the battery cell 20.

[0215] In some implementations, the material of the housing 211 includes steel or titanium. Thus, in this embodiment, by setting the material of the housing 211 to include steel or titanium, when the battery cell 20 is a high-nickel, high-silicon system battery cell 20, the structural strength and high-temperature performance of the battery cell 20 can be effectively improved, so as to balance the pressure relief performance and usability of the battery cell 20 in the event of thermal runaway.

[0216] 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.

[0217] 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 vehicle 1 shown in FIG1 above, or any electrical device using the battery device 10.

[0218] The power supply device can be any of the aforementioned devices or systems that utilize battery device 10.

[0219] 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.

[0220] According to some embodiments of this application, referring to Figures 3 to 17, this application provides a battery cell 20, which includes: an electrode assembly 22, a housing 211, a pressure relief mechanism 213, and a support plate assembly 23; the housing 211 includes a first receiving space 26, in which the electrode assembly 22 is received; the housing 211 has a first wall 50, and the first wall 50 is provided with a pressure relief hole 60 penetrating the first wall 50, the pressure relief hole 60 communicating with the first receiving space 26; the pressure relief mechanism... 213 is accommodated in the pressure relief hole 60 and connected to the housing 211; the support plate assembly 23 is fixed in the space between the electrode assembly 22 and the first wall 50. The support plate assembly 23 includes a main body 231 and a support portion 232. The support portion 232 is located on the side of the main body 231 away from the electrode assembly 22. An exhaust channel communicating with the pressure relief mechanism 213 is formed between the main body 231 and the first wall 50; wherein, the melting point of the material of the support portion 232 is greater than the melting point of the material of the main body 231. The melting point of the material of the support portion 232 is greater than or equal to 200°C. The main body 231 includes a first main body 2311 and a first extension 2312. The first extension 2312 is connected to the side of the first main body 2311 facing the first wall 50, and the first extension 2312 covers the entire surface of the support portion 232 away from the first main body 2311. The support portion 232 is provided with a first groove 234 opening towards the first main body portion 2311, and / or, the support portion 232 is provided with a first through hole 235 penetrating the support portion 232 along its thickness direction. The main body portion 231 includes a second extension portion 2313 connected to the side of the first main body portion 2311 facing the first wall 50. At least a portion of the second extension portion 2313 is accommodated in the first groove 234, and / or, at least a portion of the second extension portion 2313 is accommodated in the first through hole 235. The main body portion 231 and the support portion 232 are integrally injection molded.

[0221] 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 by, include: Electrode assembly (22); The housing (211) includes a first receiving space (26), the electrode assembly (22) is received in the first receiving space (26), the housing (211) has a first wall (50), the first wall (50) is provided with a pressure relief hole (60) penetrating the first wall (50), the pressure relief hole (60) is connected to the first receiving space (26); A pressure relief mechanism (213) is housed in the pressure relief hole (60) and connected to the housing (211); A tray assembly (23) is fixed in the space between the electrode assembly (22) and the first wall (50). The tray assembly (23) includes a main body (231) and a support (232). The support (232) is located on the side of the main body (231) away from the electrode assembly (22). An exhaust channel communicating with the pressure relief mechanism (213) is formed between the main body (231) and the first wall (50). The material of the support part (232) has a higher melting point than the material of the main body part (231).

2. The battery cell of claim 1, wherein, The material of the support part (232) has a melting point greater than or equal to 200°C.

3. The battery cell according to claim 1 or 2, characterized in that, The main body (231) includes a first main body (2311) and a first extension (2312), the first extension (2312) being connected to the side of the first main body (2311) facing the first wall (50), and the first extension (2312) covering at least a portion of the surface of the support (232) away from the first main body (2311).

4. The battery cell of claim 3, wherein, The first extension (2312) covers the entire surface of the support (232) away from the first main body (2311).

5. The battery cell according to claim 3 or 4, characterized in that, The support portion (232) is provided with a first groove (234) opening towards the first main body portion (2311), and / or, the support portion (232) is provided with a first through hole (235) penetrating the support portion (232) along the thickness direction of the support portion (232). The main body (231) includes a second extension (2313), the second extension... (2313) is connected to the side of the first main body (2311) facing the first wall (50), at least a portion of the second extension (2313) is received in the first groove (234), and / or, at least a portion of the second extension (2313) is received in the first through hole (235).

6. The battery cell of claim 5, wherein, Along the thickness of the main body (231) and toward the first wall (50), the first groove (234) and / or the first through hole (235) gradually increase in size in the direction perpendicular to the thickness of the main body (231).

7. The battery cell according to any one of claims 3 to 6, characterized in that, The main body (231) and the support (232) are integrally injection molded.

8. The battery cell of claim 7, wherein, The minimum thickness of the pallet assembly (23) is greater than or equal to 0.1 mm.

9. The battery cell according to claim 1 or 2, characterized in that, The battery cell also includes an insulating member (24), which, together with the main body (231), forms a second receiving space (27). The electrode assembly (22) is received in the second receiving space (27). The surface of the support (232) facing away from the main body (231) is fixedly connected to the surface of the first wall (50) facing the inside of the battery cell. The surface of the main body (231) facing away from the electrode assembly (22) abuts against the surface of the support (232) facing away from the first wall (50).

10. The battery cell of claim 9, wherein, The main body (231) and the insulating component (24) are integrally formed.

11. The battery cell according to claim 9 or 10, characterized in that The surface of the support (232) facing away from the main body (231) is welded to the surface of the first wall (50) facing the inside of the battery cell.

12. The battery cell of any one of claims 1 to 11, wherein, The main body (231) also includes an exhaust hole (233) that penetrates the main body (231) along the thickness direction of the main body (231). On a plane perpendicular to the thickness direction of the main body (231), the orthographic projection of the exhaust hole (233) does not overlap with the orthographic projection of the support (232).

13. The battery cell of any one of claims 1 to 12, wherein, The material of the support (232) includes at least one of the following materials: aluminum, copper, and stainless steel.

14. The battery cell of any one of claims 1 to 13, wherein, The material of the main body (231) includes polypropylene or polyethylene terephthalate.

15. The battery cell of any one of claims 1 to 14, wherein, The material of the housing (211) includes steel or titanium.

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

17. An electrical device, comprising: include: The battery device of claim 16, wherein the battery device is used to provide electrical energy to the electrical device.

18. An energy storage device, characterized by include: The battery device of claim 16, wherein the battery device is used to store electrical energy for the energy storage device.

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