Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment. The battery device comprises a box body, a battery monomer assembly, a sampling part and a heat-resistant layer, wherein the box body is provided with an accommodating space, and the box body comprises a first wall body; the battery monomer assembly is arranged in the accommodating space, the battery monomer assembly comprises a plurality of battery monomers, one side, facing the first wall body, of each battery monomer is provided with a pressure relief mechanism, and the pressure relief mechanisms are used for actuating to release the internal pressure when the internal pressure or temperature of the battery monomers reaches a preset threshold value. The sampling part is arranged between the battery monomer assembly and the first wall body, and the heat-resistant layer is an insulating part. And the heat-resistant layer is arranged between the sampling part and the battery monomer assembly. When the single battery is in thermal runaway, the pressure relief mechanism is started to release a high-temperature spraying object, and the heat-resistant layer is arranged between the sampling component and the single battery, so that the possibility that the sampling component is burnt and fails at high temperature can be reduced, and the working reliability of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a battery device and an electric appliance. BACKGROUND

[0002] FPC (Flexible Printed Circuit) and FFC (Flexible Flat Cable) are sampling components for collecting parameters such as battery voltage and temperature, and are usually installed inside a battery. The existing problem is that the sampling components are easily damaged by high temperature and thus fail to sample when the battery is in thermal runaway. CONTENT

[0003] In view of the above problems, the application provides a battery device, which is provided with a heat-resistant layer between a sampling component and a battery cell, so that the possibility of damage of the sampling component by high temperature can be reduced when the battery cell is in thermal runaway.

[0004] In a first aspect, the application provides a battery device, comprising:

[0005] a box body having a containing space, the box body comprising a first wall body;

[0006] a battery cell assembly arranged in the containing space, the battery cell assembly comprising a plurality of battery cells, the side of the battery cells facing the first wall body being provided with a pressure relief mechanism, the pressure relief mechanism being used to actuate to release internal pressure when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the first wall body and the pressure relief mechanism being arranged oppositely along a first direction;

[0007] a sampling component arranged between the battery cell assembly and the first wall body;

[0008] a heat-resistant layer arranged between the sampling component and the battery cell assembly, the heat-resistant layer being an insulating piece;

[0009] In the first direction, the projection of the pressure relief mechanism on the first wall body is arranged in the projection range of the heat-resistant layer on the first wall body.

[0010] When the battery cell is in thermal runaway, the pressure relief mechanism is opened to release high-temperature spray objects. The heat-resistant layer is an insulating piece arranged between the sampling component and the battery cell, which can reduce the possibility of failure of the sampling component caused by high temperature, thereby improving the reliability of the battery device. In the first direction, the projection of the pressure relief mechanism on the first wall body is arranged in the projection range of the heat-resistant layer on the first wall body, so that the heat-resistant layer can shield the pressure relief mechanism. When the battery cell is in thermal runaway, the temperature near the pressure relief mechanism is high. By shielding the pressure relief mechanism with the heat-resistant layer, the possibility of failure of the sampling component caused by high-temperature spray objects in thermal runaway can be reduced.

[0011] In some embodiments, along the first direction, the portion of the sampling component overlapping with the battery monomer assembly is a first portion, and the first portion and the heat-resistant layer are at least partially overlapped in projection on the first wall body, respectively.

[0012] Thus, the heat-resistant layer can shield part or all of the first portion, and can reduce the burning of the sampling component by the high-temperature object ejected by the pressure relief mechanism, so as to reduce the possibility of the sampling component being burned out by the high-temperature ejected object in thermal runaway.

[0013] In some embodiments, the battery device further comprises a busbar, along the first direction, the busbar, the heat-resistant layer and the battery monomer assembly are sequentially arranged, the busbar is arranged between the sampling component and the battery monomer assembly, the side of the battery monomer facing the first wall body is provided with an electrode terminal, the busbar is provided with an electrical connection area, the electrical connection area is electrically connected with the electrode terminal of the battery monomer, and the heat-resistant layer is provided with a relief through hole, along the first direction, the projection of the electrical connection area on the heat-resistant layer is located in the relief through hole.

[0014] The relief through hole is arranged, which can reduce the blocking of the heat-resistant layer when connecting the busbar and the electrode terminal, so as to facilitate the connection. In addition, the relief through hole can be arranged so that the large area of the heat-resistant layer covers the sampling component, so as to improve the heat resistance of the sampling component.

[0015] In some embodiments, the electrical connection area is electrically connected with the electrode terminal through the relief through hole; or the heat-resistant layer is located on the side of the busbar away from the sampling component, and the electrode terminal is electrically connected with the electrical connection area through the relief through hole; or the electrical connection area and part of the electrode terminal are located in the relief through hole.

[0016] Thus, the position relationship among the heat-resistant layer, the electrical connection area and the electrode terminal can be determined according to the position relationship among the heat-resistant layer, the sampling component and the electrode terminal along the first direction, so as to be flexibly installed as needed.

[0017] In some embodiments, the electrical connection area comprises a first electrical connection area and a second electrical connection area, the first electrical connection area and the second electrical connection area are arranged in the second direction and are electrically connected with the electrode terminals of the two battery monomers one by one, and the relief through hole comprises a first relief through hole and a second relief through hole arranged in the second direction, along the first direction, the projection of the first electrical connection area on the heat-resistant layer is located in the first relief through hole, and the projection of the second electrical connection area on the heat-resistant layer is located in the second relief through hole, and the first direction intersects with the second direction.

[0018] Thus, compared with the communication mode of the first relief through hole and the second relief through hole, the area of the heat-resistant layer can be increased, so as to better protect the sampling component from heat.

[0019] In some embodiments, the first wall body is provided with a first through hole and a second through hole, and in the first direction, a projection of the first electric connection region on the first wall body is located in the first through hole, and a projection of the second electric connection region on the first wall body is located in the second through hole.

[0020] Therefore, in assembly, the busbar, the sampling component and the box body can be integrated first, and finally the electrode terminal is electrically connected with the busbar by passing through the corresponding first through hole and second through hole through the installation tool. Therefore, the first through hole and the second through hole are provided, and modular assembly can be realized to facilitate installation of the battery device.

[0021] In some embodiments, the inside of at least one of the first through hole and the second through hole is filled with an insulating adhesive layer.

[0022] The insulating adhesive layer seals the first through hole and / or the second through hole, which can prevent external water, dust and other impurities from entering the inside of the box body, and can also isolate the busbar from the outside to improve the safety of the battery device.

[0023] In some embodiments, the box body includes a first box body and a second box body, the first box body is covered on the second box body in the first direction and forms a containing space together with the second box body; the first box body has a first wall body, and the first box body is insulated from the sampling component.

[0024] Therefore, the first box body can be prevented from being electrified to improve the safety of the battery device.

[0025] In some embodiments, the melting point of the heat-resistant layer is above 500 DEG C.

[0026] Therefore, the possibility of sampling failure caused by high-temperature burning damage to the sampling component during thermal runaway can be reduced.

[0027] In some embodiments, the heat-resistant layer is an insulating member.

[0028] Therefore, the possibility of short circuit of the battery device can be reduced, and the safety of the battery device can be improved.

[0029] In some embodiments, the heat-resistant layer includes a mica layer; or the heat-resistant layer includes a support layer and an insulating layer, an outer surface of the support layer is wrapped with the insulating layer, and the yield strength of the support layer is greater than the yield strength of the insulating layer.

[0030] Therefore, the sampling component can be protected during thermal runaway of the battery monomer to reduce the possibility of burning damage to the sampling component.

[0031] In some embodiments, the heat-resistant layer is connected with the first wall body; or the heat-resistant layer is connected with the sampling component.

[0032] In a second aspect, the application provides a power consuming device comprising the battery device of the first aspect, the battery device being configured to provide electric energy to the power consuming device.

[0033] Due to the power consuming device comprising all the technical features of the battery device of the first aspect, the effects are the same as described above, which will not be repeated here.

[0034] The above description is only a summary of the technical solutions of the application. In order to enable one skilled in the art to better understand the technical means of the application and implement the same according to the contents of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more apparent and understandable, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0035] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limiting of the application. Moreover, in the drawings, like reference numerals denote same or similar components. In the drawings:

[0036] Figure 1 An exploded view of a battery device according to some embodiments of the application;

[0037] Figure 2 An isometric view of a battery cell in a battery device according to some embodiments of the application;

[0038] Figure 3 A partial exploded view of a battery device according to some embodiments of the application;

[0039] Figure 4 A partial isometric view of a battery device according to some embodiments of the application;

[0040] Figure 5 A partial cross-sectional view of a heat-resistant layer in a battery device according to some embodiments of the application, passing through a first avoiding through hole and a second avoiding through hole;

[0041] Figure 6 A structure view of a power consuming device according to some embodiments of the application, which is a vehicle.

[0042] The reference signs in the detailed description of the embodiments are as follows:

[0043] 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0044] 10, box body; 11, first box body; 111, first through hole; 112, second through hole; 113, first wall body; 12, second box body;

[0045] 20, battery cell assembly; 21, battery cell; 211, electrode terminal; 212, pressure relief mechanism;

[0046] 30, sampling part; 31, electrical connection part;

[0047] 40, busbar;

[0048] 50, heat-resistant layer; 51, support layer; 52, insulating layer; 53, avoidance through hole; 531, first avoidance through hole; 532, second avoidance through hole;

[0049] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0050] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0053] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0055] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0056] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0057] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0058] When the battery is working, the sampling components inside the battery collect the voltage, temperature and other parameters of the battery monomer, and feed back the collected parameters to the BMS (Battery Management System), and the BMS monitors the state of the battery according to the collected parameters to take corresponding execution operation instructions to protect the battery. When the battery is in thermal runaway, the battery monomer will spray a large amount of high-temperature substances, which will spray onto the surface of the sampling components, causing the sampling components to be damaged.

[0059] In view of this, the present application provides a battery device, by setting a heat-resistant layer between the sampling components and the battery monomer, when the battery monomer is in thermal runaway, the heat resistance of the sampling components can be improved, to reduce the possibility of the sampling components being damaged by high-temperature gas.

[0060] The power consumption equipment provided by the present application can be, but is not limited to, electric vehicles, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes airplanes, rockets, space shuttles and spacecraft, etc.

[0061] The following embodiments are described by taking a battery device 100 of some embodiments of the present application as an example for convenience of description.

[0062] Please refer to Figure 1 The battery device 100 mentioned in the embodiments of the present application can include one or more battery cell assemblies 20 for providing voltage and capacity.

[0063] The battery cell assembly 20 can include a plurality of battery cells 21 connected in series, in parallel, or in a mixed connection through a busbar 40.

[0064] The battery cell assembly 20 is generally formed by arranging a plurality of battery cells 21.

[0065] As an example, the battery cell assembly 20 can be a battery module formed by arranging and fixing a plurality of battery cells 21 into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 21 with a cable tie.

[0066] As an example, the battery cell assembly 20 can also be accommodated in the case 10 by directly fixing a plurality of battery cells 21 to the case 10.

[0067] As an example, the case 10 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that an enclosed space is formed inside the case 10 to accommodate the battery cell assembly 20. The top cover here can be the first case 11. Enclosed means covered or closed, which can be sealed or unsealed.

[0068] The case 10 can be part of the chassis structure of the vehicle. For example, part of the case 10 can become at least part of the floor of the vehicle, or part of the case 10 can become at least part of the cross beam and the longitudinal beam of the vehicle.

[0069] In the embodiments of the present application, the battery cell 21 can be a secondary battery, which means that the battery cell 21 can be activated by charging after discharging to continue to be used.

[0070] The battery cell 21 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which are not limited in the embodiments of the present application.

[0071] The battery cell 21 generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell 21, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator disposed between the positive electrode and the negative electrode can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0072] 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.

[0073] 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.

[0074] 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.).

[0075] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0076] 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 can be filled and / or deposited within the foamed metal.

[0077] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0078] 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.).

[0079] 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.

[0080] 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.

[0081] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 21. 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 cell 21 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0082] 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.

[0083] As an example, negative electrode active materials can be filled and / or deposited within the negative electrode current collector.

[0084] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0085] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0086] 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.

[0087] 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 ceramics. 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.

[0088] 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.

[0089] In some embodiments, the battery cell 21 further 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, which can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0090] Liquid electrolytes include electrolyte salts and solvents.

[0091] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0092] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0093] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell 21, such as additives that improve the overcharge / fast charge performance of the battery cell 21, additives that improve the high-temperature performance of the battery cell 21, additives that improve the low-temperature performance of the battery cell 21, etc.

[0094] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0095] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0096] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0097] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0098] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0099] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0100] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0101] In some embodiments, the electrode assembly has a stacked structure.

[0102] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0103] 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.

[0104] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0105] As an example, multiple separators can be provided, each positioned between any adjacent positive and negative electrode plates.

[0106] As an example, the separator can be continuously arranged between any adjacent positive and negative electrode plates by folding or rolling.

[0107] In some embodiments, the electrode assembly may be cylindrical, flat, or polygonal, etc.

[0108] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0109] In some embodiments, the battery cell 21 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.

[0110] As an example, the battery cell 21 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 21 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.

[0111] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also be provided with one or more.

[0112] In some embodiments, at least one electrode terminal 211 is provided on the housing, and the electrode terminal 211 is electrically connected to the tab. The electrode terminal 211 can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal 211 can be provided on the end cap or on the housing.

[0113] In some embodiments, a pressure relief mechanism is provided on the housing. The pressure relief mechanism is used to release the internal gas of the battery cell 21.

[0114] As an example, when the internal pressure or temperature of the battery cell 21 reaches a predetermined threshold, the pressure relief mechanism is activated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 21 reaches the predetermined threshold, the pressure relief mechanism performs its action, or a weak structure within the pressure relief mechanism is damaged, thereby creating an opening or channel for the release of 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 21.

[0115] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0116] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0117] The term "actuation" as used in this application refers to the pressure relief mechanism being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 21. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the pressure relief mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism, etc. When the pressure relief mechanism is actuated, the high-temperature, high-pressure substances inside the battery cell 21 are discharged outwards from the actuated portion as waste. This method allows for pressure and temperature relief of the battery cell 21 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0118] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for discharging gas inside the battery cell 21.

[0119] The emissions from the battery cell 21 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.

[0120] In some embodiments, please refer to Figures 1-4 The battery device 100 includes a housing 10, a battery cell assembly 20, a sampling component 30, and a heat-resistant layer 50. The housing 10 has a receiving space and includes a first wall 113. The battery cell assembly 20 is disposed within the receiving space and includes multiple battery cells 21. Each battery cell 21 has a pressure relief mechanism 212 on its side facing the first wall 113. The pressure relief mechanism 212 is actuated to release internal pressure when the internal pressure or temperature of the battery cell 21 reaches a predetermined threshold. The first wall 113 and the pressure relief mechanism 212 are arranged opposite each other along a first direction X. The sampling component 30 is disposed between the battery cell assembly 20 and the first wall 113. The heat-resistant layer 50 is disposed between the sampling component 30 and the battery cell assembly 20.

[0121] The heat-resistant layer 50 refers to the structural layer disposed between the sampling component 30 and the battery cell 21 that can be prevented from being melted by high temperature in the event of thermal runaway.

[0122] The first wall 113 can be the top wall, bottom wall, or side wall of the housing 10. Taking the first wall 113 as a side wall as an example, the battery cell 21 can be a blade battery cell, and its pressure relief mechanism 212 is arranged facing the side wall.

[0123] The sampling component 30 refers to a module used to acquire parameters such as battery voltage or temperature. Specifically, it may include at least one of a pressure sensor or a temperature sensor, such as integrating the pressure sensor and / or temperature sensor on a circuit board to acquire the temperature and / or voltage of the battery cell 21. For example, the sampling component 30 can be an FPC or an FFC.

[0124] Taking FPC or FFC as an example, the heat-resistant layer 50 can be disposed on the side of the FPC or FFC facing the battery cell 21, and can be fixed to the surface of the FPC or FFC busbar by means of adhesive bonding or screw connection. The heat-resistant layer 50 can also be a high-temperature resistant insulating coating, formed on the surface of the FPC or FFC by spraying. For example, it can be one of an alumina coating or a silicon oxide coating.

[0125] When the battery cell 21 experiences thermal runaway, the pressure relief mechanism 212 is activated to release the high-temperature ejected object. The heat-resistant layer 50 is located between the sampling component 30 and the battery cell 21, which can reduce the possibility of the sampling component 30 being burned and failing at high temperatures, thereby improving the reliability of the battery device 100.

[0126] In some embodiments, the housing 10 is provided with a pressure relief component, which may have the same or different structure as the pressure relief mechanism 212. For example, the pressure relief component may be an explosion-proof valve. The pressure relief component may be located on the top wall, bottom wall, or side wall of the housing 10. When the battery cell 21 experiences thermal runaway, the pressure relief mechanism 212 opens to spray a high-temperature object into the housing 10 after reaching a preset pressure. When the pressure inside the housing 10 reaches the set pressure, the pressure relief component opens to discharge the high-temperature object.

[0127] In some embodiments, along the first direction X, the projection of the pressure relief mechanism 212 onto the first wall 113 is located within the projection range of the heat-resistant layer 50 onto the first wall 113.

[0128] Along the first direction X, the projection of the pressure relief mechanism 212 on the first wall 113 is located within the projection range of the heat-resistant layer 50 on the first wall 113, meaning that the projection of the pressure relief mechanism 212 on the first wall 113 is located within the boundary of the projection of the heat-resistant layer 50 on the first wall 113, and its projection edge may or may not coincide with the boundary portion of the projection of the heat-resistant layer 50 on the first wall 113.

[0129] Therefore, the heat-resistant layer 50 can shield the pressure relief mechanism 212. When the battery cell 21 is thermally runaway, the temperature near the pressure relief mechanism 212 is high. By shielding the pressure relief mechanism 212 with the heat-resistant layer 50, the possibility of the high-temperature jet object from thermal runaway burning the sampling component 30 can be reduced.

[0130] In some embodiments, along the first direction X, the portion of the sampling component 30 that overlaps with the battery cell assembly 20 is a first portion, and the first portion and the heat-resistant layer 50 at least partially overlap in the projection of the first wall 113.

[0131] Along the first direction X, the portion of the sampling component 30 that overlaps with the battery cell assembly 20 refers to the portion of the sampling component 30 whose projection on the first wall 113 corresponds to the projection of the battery cell assembly 20 on the first wall 113.

[0132] Therefore, the heat-resistant layer 50 partially or completely blocks the first part, which can reduce the burning of the sampling component 30 by the high-temperature object ejected by the pressure relief mechanism 212, thereby reducing the possibility of the sampling component 30 being burned and failing due to thermal runaway high-temperature ejected object.

[0133] In some embodiments, please refer to Figures 1-4 The battery device 100 also includes a busbar 40. Along the first direction X, the busbar 40, the heat-resistant layer 50 and the battery cell assembly 20 are arranged in sequence. The busbar 40 is located between the sampling component 30 and the battery cell assembly 20. The battery cell 21 has an electrode terminal 211 on the side facing the first wall 113. The busbar 40 has an electrical connection area, which is electrically connected to the electrode terminal 211 of the battery cell 21. The heat-resistant layer 50 has a clearance through hole 53. Along the first direction X, the projection of the electrical connection area on the heat-resistant layer 50 is located in the clearance through hole 53.

[0134] The electrical connection area refers to the part of the busbar 40 that is electrically connected to the electrode terminal 211.

[0135] Busbar 40 refers to a conductive component that collects and conducts current, and can be made of copper or aluminum by stamping or bending.

[0136] The sampling component 30 can be electrically connected to the busbar 40. Taking the sampling component 30 as an FPC or FFC as an example, the sampling component 30 includes an electrical connection part 31, which is electrically connected to the busbar 40. Specifically, it can be fixed to the busbar 40 by welding.

[0137] Taking the welding of electrode terminal 211 and busbar 40 as an example, during welding, the busbar 40, sampling component 30, and heat-resistant layer 50 can be integrated into the first wall 113 first. After the battery cell assembly 20 is installed into the housing 10 and the housing 10 is encapsulated, the busbar 40 and electrode terminal 211 are welded. Optionally, the area of ​​the avoidance through holes 53 is larger than the welding area between the electrode terminal 211 and the busbar 40, so as to reduce the possibility of burning the first wall 113 and causing damage to the first wall 113 during welding. Alternatively, the busbar 40, sampling component 30, and heat-resistant layer 50 can be placed on top of the electrode terminal 211, and the busbar 40, sampling component 30, and electrode terminal 211 can be welded together. Finally, the housing 10 is encapsulated.

[0138] In another example, the electrode terminal 211 and the busbar 40 are connected by screws. Specifically, a threaded hole is provided on the surface of the electrode terminal 211, and a corresponding hole is made in the busbar 40. The busbar 40 is then fixed to the surface of the electrode terminal 211 by screws. In this case, the clearance through hole 53 is mainly to allow clearance for installation tools and screws, thus facilitating installation.

[0139] The avoidance of the through hole 53 reduces the obstruction of the heat-resistant layer 50 when connecting the busbar 40 and the electrode terminal 211, thus facilitating the connection. Furthermore, the avoidance of the through hole 53 allows a large area of ​​the heat-resistant layer 50 to cover the sampling component 30, thereby improving the heat resistance of the sampling component 30.

[0140] In some embodiments, the electrical connection area passes through the clearance through-hole 53 and is electrically connected to the electrode terminal 211; or, the heat-resistant layer 50 is located on the side of the busbar 40 away from the sampling component 30, and the electrode terminal 211 passes through the clearance through-hole 53 and is electrically connected to the electrical connection area; or, the electrical connection area and part of the electrode terminal 211 are both located within the clearance through-hole 53.

[0141] Therefore, the positional relationship between the heat-resistant layer 50, the electrical connection area, and the electrode terminal 211 can be determined based on the positional relationship of the heat-resistant layer 50, the sampling component 30, and the electrode terminal 211 along the first direction X, so as to allow for flexible installation as needed.

[0142] In some embodiments, please refer to Figure 1 , Figure 3 and Figure 4 The electrical connection area includes a first electrical connection area and a second electrical connection area. The first electrical connection area and the second electrical connection area are spaced apart along the second direction Y and are electrically connected to the electrode terminals 211 of the two battery cells 21. The clearance through hole 53 includes a first clearance through hole 531 and a second clearance through hole 532 spaced apart along the second direction Y. Along the first direction X, the projection of the first electrical connection area on the heat-resistant layer 50 is located in the first clearance through hole 531, and the projection of the second electrical connection area on the heat-resistant layer 50 is located in the second clearance through hole 532. The first direction X intersects the second direction Y.

[0143] The shapes of the first clearance through hole 531 and the second clearance through hole 532 can be, but are not limited to, circular, square, or elliptical shapes.

[0144] The first direction X and the second direction Y can be perpendicular or not.

[0145] The first clearance through hole 531 and the second clearance through hole 532 can be closed or open. Here, a closed opening refers to an opening whose edges form a continuous closed loop, and an open opening refers to an opening that lacks an edge on one side.

[0146] Taking a number of battery cell modules 20 as an example, the multiple battery cell modules 20 are arranged along a third direction Z, and the multiple battery cells 21 of the same battery cell module 20 are arranged along a second direction Y. The second direction Y and the third direction Z intersect, and the plane where the two are located intersects with the first direction X. In the same battery cell module 20, each battery cell 21's electrode terminal 211 is electrically connected to a busbar 40, and the electrical connection area of ​​each busbar 40 is projected into the heat-resistant layer 50 within the clearance through hole 53.

[0147] Optionally, the first direction X, the second direction Y, and the third direction Z are mutually perpendicular.

[0148] Therefore, compared to the method of connecting the first clearance through-hole 531 and the second clearance through-hole 532, the area of ​​the heat-resistant layer 50 can be increased to better protect the sampling component 30 from heat. In other embodiments, along the first direction X, the projections of the first electrical connection area and the second electrical connection area on the heat-resistant layer 50 are respectively located within the same clearance through-hole 53, that is, the first clearance through-hole 531 and the second clearance through-hole 532 are connected to form a clearance through-hole 53.

[0149] In some embodiments, please refer to Figure 1 , Figure 3 and Figure 4 The first wall 113 is provided with a first through hole 111 and a second through hole 112. Along the first direction X, the projection of the first electrical connection area on the first wall 113 is located in the first through hole 111, and the projection of the second electrical connection area on the first wall 113 is located in the second through hole 112.

[0150] The shape of the first through hole 111 and the shape of the second through hole 112 can be, but are not limited to, circular, square or elliptical.

[0151] Therefore, during assembly, the busbar 40, sampling component 30, and housing 10 can be integrated together first, and then the electrode terminal 211 can be electrically connected to the busbar 40 by passing an installation tool through the corresponding first through hole 111 and second through hole 112. Thus, the design of the first through hole 111 and second through hole 112 enables modular assembly, facilitating the installation of the battery device 100.

[0152] In some embodiments, at least one of the first through hole 111 and the second through hole 112 is filled with an insulating adhesive layer.

[0153] The insulating adhesive layer refers to a cured layer of gel-like material with electrical insulating function formed in the first through hole 111 and the second through hole 112 through processes such as coating or potting.

[0154] The materials of the insulating adhesive layer include, but are not limited to, epoxy resin insulating adhesive, silicone insulating adhesive, polyimide insulating adhesive, or phenolic resin insulating adhesive.

[0155] The insulating adhesive layer seals the first through hole 111 and / or the second through hole 112, which can prevent external water, dust and other impurities from entering the housing 10. At the same time, it can isolate the busbar 40 from the outside, thereby improving the safety of the battery device 100.

[0156] In some embodiments, please refer to Figure 1 The housing 10 includes a first housing 11 and a second housing 12. The first housing 11 covers the second housing 12 along the first direction X and together with the second housing 12 forms an accommodating space. The first housing 11 has a first wall 113 and is insulated from the sampling component 30.

[0157] The first housing 11 can be made of metal or insulating material, for example, it can be made of plastic or composite material made of fiber-reinforced resin matrix.

[0158] Taking the first housing 11 as an example of being made of metal, the sampling component 30 can be insulated and encapsulated with resin and then connected to the first wall 113 to achieve an insulated connection.

[0159] The connection methods between the sampling component 30 and the first wall 113 include, but are not limited to, bonding, snap-fitting, or screw connection.

[0160] This prevents the first housing 11 from becoming energized, thereby improving the safety of the battery device 100.

[0161] In some embodiments, the melting point of the heat-resistant layer 50 is above 500°C.

[0162] The insulating and heat-resistant layer 50 is a single or composite structural layer that simultaneously possesses electrical insulation and high-temperature resistance. Here, a single structural layer refers to a structural layer formed from only one material, while a composite structural layer refers to a structural layer formed from two or more materials. For example, the insulating and heat-resistant layer 50 includes a first layer and a second layer, with the second layer covering the outer surface of the first layer. The first layer can be a conductive material layer or an insulating material layer, and the second layer is an insulating material layer. In this way, when the insulating and heat-resistant layer 50 overlaps between two conductive components, electrical insulation can be achieved.

[0163] Therefore, the possibility of sampling failure due to high temperature burning of sampling component 30 during thermal runaway can be reduced.

[0164] In some embodiments, the heat-resistant layer 50 is an insulating element.

[0165] This reduces the likelihood of a short circuit in the battery device 100 and improves the safety of the battery device 100.

[0166] The heat-resistant layer 50 can be made of, but is not limited to, one of oxide materials or silicate materials. Specifically, it can be ceramic fiber, alumina ceramic, or magnesium oxide.

[0167] In some embodiments, the heat-resistant layer 50 may include a mica layer; or, please refer to Figure 5 The heat-resistant layer 50 includes a support layer 51 and an insulating layer 52. The outer surface of the support layer 51 is covered with the insulating layer 52, and the yield strength of the support layer 51 is greater than the yield strength of the insulating layer 52.

[0168] The mica layer can be formed by attaching mica paper to the sampling component 30.

[0169] When the heat-resistant layer 50 has clearance holes 53, the surface of the clearance holes 53 is covered by an insulating layer 52 and forms a connection with the surface of the support layer 51. In other words, the inner walls of the clearance holes 53 are all formed by the insulating layer 52. The support layer 51 mainly serves to improve the strength of the heat-resistant layer 50. Specifically, it can be a structural layer formed of a conductive material or a structural layer formed of an insulating material. For example, the material of the support layer 51 can be graphite or metal mesh.

[0170] Therefore, the sampling component 30 can be protected in the event of thermal runaway of the battery cell 21, thereby reducing the possibility of the sampling component 30 being burned and damaged.

[0171] In some embodiments, the heat-resistant layer 50 is connected to the first wall 113; or, the heat-resistant layer 50 is connected to the sampling component 30.

[0172] For ease of explanation, the following embodiments use an electrical device from some embodiments of this application as an example.

[0173] The electrical equipment includes the battery device 100 of the above embodiments, which is used to provide electrical energy to the electrical equipment.

[0174] The electrical equipment includes the battery device 100 of the above embodiments, which is used to provide electrical energy to the electrical equipment.

[0175] Please refer to Figure 6 , Figure 6This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0176] Since the electrical equipment includes all the technical features of the battery device 100 in the above embodiments, the effect is the same as described above, and will not be repeated here.

[0177] Since the electrical equipment includes all the technical features of the battery device 100 in the above embodiments, the effect is the same as described above, and will not be repeated here.

[0178] In one specific alternative embodiment of the battery device 100, please refer to Figures 1-4The battery device 100 includes a housing 10, a busbar 40, a battery cell assembly 20, a sampling component 30, and a heat-resistant layer 50. The housing 10 includes a first housing 11 and a second housing 12, which are connected and define a receiving space. The first housing 11 is located on top of the second housing 12 and includes a first wall 113. The first housing 11 is an insulator. The battery cell assembly 20 is disposed within the receiving space and includes multiple battery cells 21. Each battery cell 21 has a pressure relief mechanism 212 on the side facing the first wall 113. The pressure relief mechanism 212 is actuated to release internal pressure when the internal pressure or temperature of the battery cell 21 reaches a predetermined threshold. The sampling component 30 is disposed between the battery cell assembly 20 and the first wall 113. The heat-resistant layer 50 is disposed between the sampling component 30 and the battery cell assembly 20. Along the first direction X, the projection of the pressure relief mechanism 212 onto the first wall 113 falls within the projection range of the heat-resistant layer 50 onto the first wall 113. The portion of the sampling component 30 that overlaps with the battery cell assembly 20 is the first part, and the first part and the heat-resistant layer 50 at least partially overlap in their projections onto the first wall 113. The heat-resistant layer 50 is connected to the sampling component 30, and the sampling component 30 is connected to the first wall 113. A busbar 40 is disposed between the sampling component 30 and the battery cell assembly 20. The side of the battery cell 21 facing the first wall 113 has an electrode terminal 211. The busbar 40 has an electrical connection area, which includes a first electrical connection area and a second electrical connection area. The first electrical connection area and the second electrical connection area are spaced apart along the second direction Y and are welded to the electrode terminals 211 of the two battery cells 21 one by one. The clearance through holes 53 include a first clearance through hole 531 and a second clearance through hole 532 spaced apart along the second direction Y. Along the first direction X, the projection of the first electrical connection area on the heat-resistant layer 50 is located in the first clearance through hole 531, and the projection of the second electrical connection area on the heat-resistant layer 50 is located in the second clearance through hole 532. The first direction X intersects the second direction Y. The first wall 113 is provided with a first through hole 111 and a second through hole 112. Along the first direction X, the projection of the first electrical connection area on the first wall 113 is located in the first through hole 111, and the projection of the second electrical connection area on the first wall 113 is located in the second through hole 112. The interior of both the first through hole 111 and the second through hole 112 is filled with an insulating adhesive layer. The heat-resistant layer 50 is an insulating component with a melting point above 500°C. The sampling component 30 includes an electrical connection part 31, which is welded to the busbar 40.

[0179] The heat-resistant layer 50 is set as an insulating component with a melting point above 500°C and is located on the side of the sampling component 30 facing the battery cell 21. When the thermal runaway relief mechanism 212 of the battery cell 21 is activated, it can prevent the sampling component 30 from being damaged or malfunctioning by high-temperature substances. Furthermore, the busbar 40, sampling component 30, heat-resistant layer 50, and first wall 113 can be integrated together. After the battery cell assembly 20 is installed inside the housing 10, the first housing 11 and the second housing 12 are closed. Due to the avoidance of the busbar 40 by the first and second clearance through holes 531 and 532, the first electrical connection area and the second electrical connection area are electrically connected to the electrode terminals 211 of the two battery cells 21 one-to-one by welding through the first through hole 111 and the second through hole 112. Finally, glue is injected into the first through hole 111 and the second through hole 112 to form a glue layer for sealing, thereby realizing modular assembly for easy installation. Moreover, by using this method of installation, the first wall 113 can be closer to the battery cell 21 along the first direction X. Under the premise that the size of the housing 10 along the first direction X remains unchanged, the volume of the battery cell 21 can be made larger, which is beneficial to improving the volumetric energy density of the battery device 100.

[0180] 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 device, characterized in that, include: A housing having a receiving space, the housing including a first wall; A battery cell assembly is disposed within the receiving space. The battery cell assembly includes multiple battery cells. Each battery cell has a pressure relief mechanism on the side facing the first wall. The pressure relief mechanism is actuated to release the internal pressure when the internal pressure or temperature of the battery cell reaches a predetermined threshold. The first wall and the pressure relief mechanism are arranged opposite to each other along a first direction. A sampling component is disposed between the battery cell assembly and the first wall. A heat-resistant layer is disposed between the sampling component and the battery cell assembly, and the heat-resistant layer is an insulating component; Along the first direction, the projection of the pressure relief mechanism onto the first wall is located within the projection range of the heat-resistant layer onto the first wall.

2. The battery device according to claim 1, characterized in that, Along the first direction, the portion of the sampling component that overlaps with the battery cell assembly is the first portion, and the projections of the first portion and the heat-resistant layer on the first wall body at least partially overlap.

3. The battery device according to claim 1, characterized in that, The battery device further includes a busbar. Along the first direction, the busbar, the heat-resistant layer, and the battery cell assembly are arranged sequentially. The battery cell has an electrode terminal on the side facing the first wall. The busbar has an electrical connection area that is electrically connected to the electrode terminal of the battery cell. The heat-resistant layer has a clearance through hole. Along the first direction, the projection of the electrical connection area on the heat-resistant layer is located within the clearance through hole.

4. The battery device according to claim 3, characterized in that, The electrical connection area passes through the clearance through-hole and is electrically connected to the electrode terminal; or... The heat-resistant layer is located on the side of the busbar opposite to the sampling component, and the electrode terminal passes through the clearance hole and is electrically connected to the electrical connection area; or... The electrical connection area and part of the electrode terminals are located within the clearance through hole.

5. The battery device according to claim 3, characterized in that, The electrical connection area includes a first electrical connection area and a second electrical connection area, which are spaced apart along a second direction and are electrically connected to the electrode terminals of the two battery cells respectively. The clearance through hole includes a first clearance through hole and a second clearance through hole spaced apart along the second direction. Along the first direction, the projection of the first electrical connection area on the heat-resistant layer is located in the first clearance through hole, and the projection of the second electrical connection area on the heat-resistant layer is located in the second clearance through hole. The second direction intersects with the first direction.

6. The battery device according to claim 5, characterized in that, The first wall has a first through hole and a second through hole. Along the first direction, the projection of the first electrical connection area onto the first wall is located in the first through hole, and the projection of the second electrical connection area onto the first wall is located in the second through hole.

7. The battery device according to claim 6, characterized in that, At least one of the first through hole and the second through hole is filled with an insulating adhesive layer.

8. The battery device according to any one of claims 1-7, characterized in that, The sampling component is insulated from the first wall.

9. The battery device according to claim 8, characterized in that, The enclosure includes a first enclosure and a second enclosure, wherein the first enclosure covers the second enclosure along the first direction and together with the second enclosure forms the accommodating space; the first enclosure has the first wall and is insulated from the sampling component.

10. The battery device according to any one of claims 1-7, characterized in that, The melting point of the heat-resistant layer is above 500°C.

11. The battery device according to any one of claims 1-7, characterized in that, The heat-resistant layer includes a mica layer; or... The heat-resistant layer includes a support layer and an insulating layer. The outer surface of the support layer is covered with the insulating layer, and the yield strength of the support layer is greater than the yield strength of the insulating layer.

12. The battery device according to any one of claims 1-7, characterized in that, The heat-resistant layer is connected to the first wall; or, the heat-resistant layer is connected to the sampling component.

13. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-12, the battery device being used to provide electrical energy to the electrical equipment.

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