Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device comprises a box body and a battery monomer. A containing space is formed in the box body, and the box body is provided with a first box wall. The single battery is arranged in the accommodating space and comprises a pressure relief mechanism, and the pressure relief mechanism is arranged towards the first box wall in the thickness direction of the first box wall. Wherein the first box wall comprises a wall body and a heat-resistant layer, the heat-resistant layer is arranged on the wall body, the projection of the heat-resistant layer covers the pressure relief mechanism in the thickness direction of the first box wall. A heat-resistant layer is arranged in the first box wall and can enhance the heat resistance of the first box wall. When the single battery is in thermal runaway, high-temperature emissions in the single battery are sprayed to the first box wall through the pressure relief mechanism, and the risk of damage to the first box wall is reduced by the arrangement of the heat-resistant layer, so that the risk of aggravation of thermal runaway caused by external airflow entering the box body is reduced, and the reliability of the battery device is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] A battery device generally includes a box and a battery cell, wherein the battery cell is contained in the box. In the manufacturing process of the battery device, the reliability of the battery device is an issue that cannot be ignored. Therefore, how to improve the reliability of the battery device is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] The embodiments of the present application provide a battery device and an electrical device, which can improve the reliability of the battery device.

[0005] In a first aspect, an embodiment of the present application provides a battery device, comprising a box body and a battery cell; a accommodating space is formed inside the box body, and the box body has a first box wall; the battery cell is arranged in the accommodating space, and the battery cell includes a pressure relief mechanism, and the pressure relief mechanism is arranged toward the first box wall along the thickness direction of the first box wall; wherein the first box wall includes a wall body and a heat-resistant layer, the heat-resistant layer is arranged on the wall body, and the projection of the heat-resistant layer covers the pressure relief mechanism along the thickness direction of the first box wall.

[0006] In the above technical solution, the battery cell is contained in the box body, which can protect the battery cell and reduce the interference of the external environment on the battery cell. A heat-resistant layer is provided in the first box wall, which can enhance the heat resistance of the first box wall. When the battery cell is in thermal runaway, the high-temperature emissions inside the battery cell are sprayed to the first box wall through the pressure relief mechanism. The provision of the heat-resistant layer reduces the risk of damage to the first box wall, thereby reducing the risk of external airflow entering the box body to aggravate thermal runaway, and improving the reliability of the battery device.

[0007] In some embodiments, the material damage temperature of the heat-resistant layer is greater than the material damage temperature of the wall body. In this way, the heat-resistant layer is more heat-resistant than the wall body, and when the wall body is damaged by heat, the heat-resistant layer can maintain the seal of the battery cell, which can reduce the risk of the first box wall being melted and damaged by high-temperature emissions, thereby improving the reliability of the battery device.

[0008] In some embodiments, the material damage temperature of the heat-resistant layer is greater than or equal to 400° C. By setting the material damage temperature of the heat-resistant layer to be greater than or equal to 400° C., the risk of the heat-resistant layer being damaged by the high temperature of thermal runaway can be reduced, thereby reducing the risk of high-temperature emissions melting the first tank wall and improving the heat resistance of the first tank wall.

[0009] In some embodiments, the first box wall further includes an insulating layer, which is disposed on a side of the wall body facing the battery cell, and is configured to insulate the wall body and the battery cell. The insulating layer insulates the wall body and the battery cell, thereby improving the insulation performance of the box, reducing the risk of insulation failure of the battery cell, and improving the reliability of the battery device.

[0010] In some embodiments, the insulating layer and the wall body together define a receiving cavity, and the heat-resistant layer is disposed in the receiving cavity. By disposing the heat-resistant layer in the receiving cavity, the position of the heat-resistant layer can be fixed, reducing the risk of the heat-resistant layer detaching from the wall body.

[0011] In some embodiments, the wall body has a first surface and a second surface that are arranged opposite to each other along the thickness direction of the first box wall, the first surface is arranged facing the battery cell, and the first surface is provided with a groove. The insulating layer has a third surface, the third surface is connected to the first surface, and the third surface and the groove wall of the groove define a receiving cavity. The groove helps to limit the installation position of the heat-resistant layer, and the third surface and the groove wall of the groove define the receiving cavity, which facilitates the installation of the heat-resistant layer and reduces the risk of the heat-resistant layer detaching from the wall body.

[0012] In some embodiments, the insulating layer and the wall body together define a plurality of accommodating cavities, each of which is provided with at least one heat-resistant layer, and along the thickness direction of the first box wall, the projection of each heat-resistant layer covers the pressure relief mechanism of at least one battery cell. By providing a plurality of accommodating cavities and providing at least one heat-resistant layer in each accommodating cavity, the plurality of heat-resistant layers help to cover the pressure relief mechanisms of the battery cells respectively, reduce the use of heat-resistant layers, and save costs.

[0013] In some embodiments, the insulating layer is made of polyetheretherketone, polyimide or soluble polytetrafluoroethylene.

[0014] In some embodiments, the battery device includes a battery cell assembly, the battery cell assembly includes a plurality of battery cells, the plurality of battery cells are arranged along a first direction, along the thickness direction of the first box wall, the projection of each heat-resistant layer covers the pressure relief mechanism of the plurality of battery cells of a battery cell assembly, and the thickness direction of the first box wall is perpendicular to the first direction. By arranging that each heat-resistant layer covers the pressure relief mechanism of the battery cell of a battery cell assembly, it is helpful to arrange the heat-resistant layer, and also helps to position and assemble the battery cell and the box.

[0015] In some embodiments, there are multiple battery cell assemblies, and the multiple battery cell assemblies are arranged along the second direction, and the thickness direction of the first box wall, the first direction, and the second direction are perpendicular to each other. By arranging the multiple battery cell assemblies along the second direction, each heat-resistant layer corresponds to the pressure relief mechanism of the battery cell of a battery cell assembly, which facilitates the positioning and installation of the heat-resistant layer and saves the material use of the heat-resistant layer.

[0016] In some embodiments, the wall body has a first surface and a second surface arranged opposite to each other along the thickness direction of the first box wall, and the first surface is provided with a groove, and at least part of the heat-resistant layer is accommodated in the groove. By providing the groove on the wall body, the groove can locate the installation position of the heat-resistant layer, making the installation of the heat-resistant layer more convenient.

[0017] In some embodiments, a protrusion is provided at a position of the second surface corresponding to the groove. In this way, the protrusion can be formed correspondingly when the groove is formed, making the processing of the groove more convenient.

[0018] In some embodiments, the first surface is disposed facing the battery cell. By disposing the first surface facing the battery cell, the heat-resistant layer is closer to the battery cell than the wall body, and the heat-resistant layer can protect the wall body, slow down the high temperature generated by the high-temperature emissions in the battery cell from being transferred to the wall body, and reduce the risk of the wall body being damaged by heat.

[0019] In some embodiments, the heat-resistant layer is made of ceramic fiber cloth, pre-oxidized silk fiber, silica fiber felt or modified polyurethane.

[0020] In some embodiments, the wall body has a Vickers hardness greater than or equal to 100 HV10. In this way, the wall body can improve the strength of the first box wall and reduce the risk of damage to the first box wall when it is squeezed by external force.

[0021] In some embodiments, the box body includes a first box body and a cover body, the first box body has an opening, the cover body closes the opening, and the cover body and the first box body together define a containing space; the cover body is the first box wall.

[0022] By setting the cover body as the first box wall, it is helpful to process the first box wall. The pressure relief mechanism of the battery cell exhausts air toward the cover body, which is helpful for normal pressure relief of the battery cell.

[0023] In a second aspect, an embodiment of the present application provides an electrical device, including a battery device provided by any embodiment of the first aspect, and the battery device is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0026] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0027] Figure 3 A cross-sectional view of a battery device provided for some embodiments of the present application;

[0028] Figure 4 An exploded view of a battery cell provided for some embodiments of the present application;

[0029] Figure 5 A cross-sectional view of a first box wall provided for some embodiments of the present application (showing the insulation layer);

[0030] Figure 6 for Figure 5 A partial enlarged view of the middle A area;

[0031] Figure 7 A partial structural schematic diagram of a first box wall provided for some embodiments of the present application (showing the accommodating cavity);

[0032] Figure 8 An exploded view of a battery device provided for some embodiments of the present application (showing an insulating layer);

[0033] Fig. 9 An exploded view of a battery device provided in accordance with some further embodiments of the present application.

[0034] Icons: 1-first box wall; 11-wall body; 111-first surface; 1111-groove; 112-second surface; 1121-protrusion; 12-heat-resistant layer; 13-insulating layer; 131-third surface; 14-accommodating cavity; 2-first box body; 3-cover body;

[0035] 10-box; 10a-accommodation space; 20-battery cell; 201-pressure relief mechanism; 202-housing; 2021-shell; 2022-end cover; 203-electrode terminal; 204-electrode assembly; 20a-battery cell assembly;

[0036] 100-battery device; 200-controller; 300-motor; 1000-vehicle;

[0037] X-first direction; Y-second direction; Z-thickness direction of the first box wall. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0040] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0041] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0042] In the embodiments of the present application, the same reference numerals represent 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 the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0043] The term “plurality” used in this application refers to two or more (including two).

[0044] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0045] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0046] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0047] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery cell, such as a hexagonal battery cell.

[0048] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar.

[0049] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module.

[0050] As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0051] In some embodiments, the battery device may be a battery pack, which may include a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0052] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0053] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0054] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0055] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0056] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0057] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0058] For battery cells, the main safety hazards come from the charging and discharging process, as well as the appropriate ambient temperature design. In order to effectively avoid unnecessary losses, there are generally at least three protection measures for battery cells. Specifically, the protection measures include at least switching elements, selecting appropriate isolation membrane materials, and pressure relief mechanisms. Switching elements refer to elements that can stop the battery from charging or discharging when the temperature or resistance in the battery cell reaches a certain threshold. The isolation membrane is used to isolate the positive and negative electrodes. When the temperature rises to a certain value, it can automatically dissolve the micron-level (even nano-level) micropores attached to it, so that metal ions cannot pass through the isolation membrane, terminating the internal reaction of the battery cell.

[0059] The pressure relief mechanism refers to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode sheet, negative electrode sheet, electrolyte and isolation membrane in the battery cell. The pressure relief mechanism can take the form of an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve or a safety valve, and can specifically adopt pressure-sensitive or temperature-sensitive elements or structures, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or the weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0060] The "actuation" mentioned in this application means that the pressure relief mechanism is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action produced by the pressure relief mechanism may include but is not limited to: at least a part of the pressure relief mechanism is ruptured, broken, torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged from the actuated part as emissions. In this way, the pressure and temperature of the battery cell can be relieved under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0061] The emissions from the battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode sheets, fragments of the isolation membrane, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0062] The pressure relief mechanism on the battery cell has an important impact on the safety of the battery device. For example, when short circuit, overcharging, etc. occur, thermal runaway may occur inside the battery cell, resulting in a sudden increase in pressure or temperature. In this case, the internal pressure and temperature can be released outward by actuating the pressure relief mechanism to reduce the risk of explosion and fire of the battery cell. The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0063] For battery devices, in order to promote the stable performance of battery cells and reduce the interference of external components on the normal use of battery cells, the battery cells can be placed in a box body, which can seal the battery cells and provide protection for the battery cells, thereby improving the performance of the battery cells. When thermal runaway occurs in the battery cells in the box body, the pressure relief mechanism of the battery cells is actuated to spray high-temperature emissions onto the box wall of the box body. However, the high-temperature emissions of the battery cells sprayed onto the box wall can easily cause the box wall to melt and break due to heat, and the external airflow can easily enter the interior of the box through the damaged part of the box wall, exacerbating the thermal runaway of the battery cells and increasing the risk of fire and explosion of the battery device.

[0064] In view of this, in order to reduce the risk of fire and explosion of the battery device, an embodiment of the present application provides a battery device, the battery device includes a box body and a battery cell, the box body has a first box wall, and the pressure relief mechanism of the battery cell is arranged toward the first box wall. The first box wall includes a wall body and a heat-resistant layer, and along the thickness direction of the first box wall, the projection of the heat-resistant layer covers the pressure relief mechanism.

[0065] By setting the first box wall, when the battery cell thermally runs away, the high-temperature emissions inside the battery cell are sprayed toward the first box wall through the pressure relief mechanism. The heat-resistant layer can enhance the heat resistance of the first box wall and reduce the risk of damage to the first box wall, thereby reducing the risk of external airflow entering the box body and aggravating thermal runaway, thereby improving the reliability of the battery device.

[0066] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0067] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery device 100 inside, and the battery device 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000.

[0068] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0069] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0070] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 may include a case 10 and a battery cell 20 . The case 10 is used to accommodate the battery cell 20 .

[0071] Among them, a closed space for accommodating the battery cell 20 is formed inside the box body 10. The box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 2 and a cover body 3, and the first box body 2 and the cover body 3 are buckled with each other. The first box body 2 and the cover body 3 can be in various shapes, such as a cuboid, a cylinder, etc. The first box body 2 can be a hollow structure with one side open, and the cover body 3 can also be a hollow structure with one side open. The open side of the cover body 3 and the open side of the first box body 2 are buckled with each other to form a box body 10 with a closed space. It is also possible that the first box body 2 is a hollow structure with one side open, and the cover body 3 is a plate-like structure. The cover body 3 is buckled on the open side of the first box body 2, so as to form a box body 10 with a accommodating space 10a.

[0072] In the battery device 100, there can be one or more battery cells 20. If there are more than one battery cell 20, the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection to form a battery module, and the multiple battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. Alternatively, all battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all battery cells 20 can be accommodated in the box 10. For example, Figure 2 As shown, the first box body 2 is a hollow structure with one side open, and the cover body 3 is a plate-shaped structure, which is buckled with the open side of the first box body 2 to form a box body 10 with a receiving space 10a. A plurality of battery cells 20 are received in the receiving space 10a.

[0073] In some embodiments, the battery device 100 may further include a busbar, through which multiple battery cells 20 may be electrically connected to each other, so as to realize series connection, parallel connection or mixed connection of multiple battery cells 20. The busbar may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0074] Please refer to Figure 2-Figure 4 , Figure 3 A cross-sectional view of a battery device 100 provided in some embodiments of the present application; Figure 4 An exploded view of a battery cell 20 provided in some embodiments of the present application. The embodiments of the present application provide a battery device 100, comprising a box body 10 and a battery cell 20. A accommodating space 10a is formed inside the box body 10, and the box body 10 has a first box wall 1. The battery cell 20 is arranged in the accommodating space 10a, and the battery cell 20 includes a pressure relief mechanism 201, and the pressure relief mechanism 201 is arranged toward the first box wall 1 along the thickness direction Z of the first box wall. Among them, the first box wall 1 includes a wall body 11 and a heat-resistant layer 12, and the heat-resistant layer 12 is arranged on the wall body 11, and along the thickness direction Z of the first box wall, the projection of the heat-resistant layer 12 covers the pressure relief mechanism 201.

[0075] The first box body 2 and the cover body 3 can be bonded, clamped or welded to form a box body 10 with a receiving space 10a. The first box wall 1 can be a wall portion of the first box body 2 or a wall portion of the cover body 3.

[0076] The number of the battery cell 20 may be one or more.

[0077] In the embodiment with one battery cell 20 , the pressure relief mechanism 201 of the battery cell 20 is disposed toward the first box wall 1 .

[0078] In the embodiment where there are multiple battery cells 20, there can be one heat-resistant layer 12, and along the thickness direction Z of the first box wall, the projection of one heat-resistant layer 12 covers the pressure relief mechanisms 201 of multiple battery cells 20; there can also be multiple heat-resistant layers 12, and along the thickness direction Z of the first box wall, the projection of each heat-resistant layer 12 covers at least one pressure relief mechanism 201 of the battery cell 20.

[0079] The battery cell 20 may include a pressure relief mechanism 201, a housing 202, an electrode terminal 203, and an electrode assembly 204. The electrode assembly 204 is accommodated in the housing 202, the pressure relief mechanism 201 and the electrode terminal 203 are both arranged in the housing 202, the electrode terminal 203 is electrically connected to the electrode assembly 204, and the electrode assembly 204 is electrically connected to external components through the electrode terminal 203 to realize the charging or discharging of the battery cell 20. The pressure relief mechanism 201 and the electrode terminal 203 may be arranged on the same wall of the housing 202, or may be arranged on different walls. As an example, Figure 3 and Figure 4 As shown, the shell 202 includes a shell 2021 and an end cover 2022, the shell 2021 has an opening, and the end cover 2022 closes the opening of the shell 2021 so that the end cover 2022 and the shell 2021 form a receiving cavity for accommodating the electrode assembly 204, and the pressure relief mechanism 201 and the electrode terminal 203 of the battery cell 20 are both arranged on the end cover 2022, and the end cover 2022 is arranged toward the first box wall 1, so that the pressure relief mechanism 201 is arranged toward the first box wall 1.

[0080] The heat-resistant layer 12 may be disposed on the side of the wall body 11 away from the battery cell 20; or the heat-resistant layer 12 may be disposed on the side of the wall body 11 facing the battery cell 20. The heat-resistant layer 12 may be directly connected to the wall body 11, for example, the heat-resistant layer 12 and the wall body 11 are clamped; or the heat-resistant layer 12 and the wall body 11 may be indirectly connected, for example, the heat-resistant layer 12 and the wall body 11 are bonded by heat-resistant adhesive.

[0081] The projection of the heat-resistant layer 12 along the thickness direction Z of the first box wall may completely overlap with the projection of the wall body 11 along the thickness direction Z of the first box wall; or the projection of the heat-resistant layer 12 along the thickness direction Z of the first box wall may only partially overlap with the projection of the wall body 11 along the thickness direction Z of the first box wall. The projection of the heat-resistant layer 12 covers the pressure relief mechanism 201, that is, in the projection plane perpendicular to the thickness direction Z of the first box wall, the projection of the pressure relief mechanism 201 is located in the projection of the heat-resistant layer 12. In the projection plane perpendicular to the thickness direction Z of the first box wall, the projection of the pressure relief mechanism 201 may only partially overlap with the projection of the heat-resistant layer 12; or the projection of the pressure relief mechanism 201 may completely overlap with the projection of the heat-resistant layer 12.

[0082] The material of the heat-resistant layer 12 can be polyimide, aluminosilicate ceramics, ceramic fiber cloth, pre-oxidized silk fiber, silica fiber felt or modified polyurethane.

[0083] In the embodiment of the present application, the battery cell 20 is contained in the box body 10, and the box body 10 can protect the battery cell 20 and reduce the interference of the external environment on the battery cell 20. A heat-resistant layer 12 is provided in the first box wall 1, and the heat-resistant layer 12 can enhance the heat resistance of the first box wall 1. When the battery cell 20 is in thermal runaway, the high-temperature emissions inside the battery cell 20 are sprayed toward the first box wall 1 through the pressure relief mechanism 201. The heat-resistant layer 12 can enhance the heat resistance of the first box wall 1 and reduce the risk of damage to the first box wall 1, thereby reducing the risk of external airflow entering the box body 10 to aggravate thermal runaway, and improving the reliability of the battery device 100. The heat-resistant layer 12 is provided on the wall body 11, and the heat-resistant layer 12 can also enhance the strength of the wall body 11 and reduce the risk of the wall body 11 being damaged by pressure.

[0084] In some embodiments, the material damage temperature of the heat-resistant layer 12 is greater than the material damage temperature of the wall body 11 .

[0085] The material damage temperature can be the melting point of the material or the decomposition temperature of the material. If the material has a melting point but no decomposition temperature, the melting point is the material damage temperature; if the material has a decomposition temperature but no melting point, the decomposition temperature is the material damage temperature; if the material has both a melting point and a decomposition temperature, the smaller of the melting point and the decomposition temperature is the material damage temperature.

[0086] Taking the material of the heat-resistant layer 12 as polyimide with a melting point and a decomposition temperature as an example, the melting point of the heat-resistant layer 12 is 430°C, and the decomposition temperature of the heat-resistant layer 12 is 510°C. The melting point of the heat-resistant layer is lower than the decomposition temperature of the heat-resistant layer. Therefore, the melting point of the heat-resistant layer 12 is the material damage temperature of the heat-resistant layer 12.

[0087] Taking the case where the material of the heat-resistant layer 12 is an aluminosilicate ceramic having only a decomposition temperature as an example, the heat-resistant layer 12 has no melting point, and the decomposition temperature of the heat-resistant layer 12 is the material damage temperature of the heat-resistant layer 12 .

[0088] In this embodiment, the material damage temperature of the heat-resistant layer 12 is greater than the material damage temperature of the wall body 11, so that the heat-resistant layer 12 is more heat-resistant than the wall body 11. When the wall body 11 is damaged by heat, the heat-resistant layer 12 can maintain the seal of the battery cell 20, which can reduce the risk of the first box wall 1 being melted and damaged by high-temperature emissions, thereby improving the reliability of the battery device 100.

[0089] In some embodiments, the material damage temperature of the heat-resistant layer 12 is greater than or equal to 400°C.

[0090] The material damage temperature of the heat-resistant layer 12 may be 400°C, 500°C, 600°C, 700°C, 800°C, 900°C, 1000°C, 1100°C, 1200°C, 1300°C, 1400°C, 1500°C, 1600°C, 1700°C, 1800°C, 1900°C, 2000°C, etc. The heat-resistant layer 12 may be a metal material or a non-metal material; for example, the heat-resistant layer 12 may be ceramic, nickel alloy or asbestos. In the embodiment where the heat-resistant layer 12 is a metal material, an insulating material may be added between the heat-resistant layer 12 and the battery cell 20 to insulate and isolate the heat-resistant layer 12 and the battery cell 20.

[0091] By setting the material damage temperature of the heat-resistant layer 12 to be greater than or equal to 400°C, the risk of the heat-resistant layer 12 being damaged by the high temperature of thermal runaway can be reduced. When thermal runaway occurs in the battery cell 20, the high-temperature emissions in the battery cell 20 are sprayed from the pressure relief mechanism 201 to the first box wall 1, and the heat-resistant layer 12 can resist the high temperature of the high-temperature emissions, thereby reducing the risk of the high-temperature emissions melting the first box wall 1 and improving the heat resistance of the first box wall 1. In an embodiment where the material damage temperature of the heat-resistant layer 12 is greater than the material damage temperature of the wall body 11, even if the wall body 11 is partially melted due to the high temperature, the heat-resistant layer 12 can maintain the seal of the battery cell 20 in the box body 10, reducing the risk of aggravated thermal runaway of the battery cell 20.

[0092] In some embodiments, please refer to Figure 5 , Figure 5 A cross-sectional view of the first box wall 1 provided for some embodiments of the present application (showing the insulating layer 13). The first box wall 1 also includes an insulating layer 13, which is disposed on the side of the wall body 11 facing the battery cell 20, and is configured to insulate and separate the wall body 11 and the battery cell 20.

[0093] The insulating layer 13 may be directly connected to the wall body 11; for example, the insulating layer 13 is an insulating coating sprayed on the wall body 11. The insulating layer 13 may also be indirectly connected to the wall body 11; for example, the insulating layer 13 is bonded to the wall body 11 by heat-resistant glue. Along the thickness direction Z of the first box wall, the insulating layer 13 may be closer to the battery cell 20 than the heat-resistant layer 12; or the heat-resistant layer 12 may protrude in the direction away from the wall body 11 and pass through the insulating layer 13, so that part of the heat-resistant layer 12 is closer to the battery cell 20 than the insulating layer 13.

[0094] The insulating layer 13 insulates the isolation wall body 11 and the battery cell 20 , thereby improving the insulation performance of the box body 10 , reducing the risk of insulation failure of the battery cell 20 , and improving the reliability of the battery device 100 .

[0095] In some embodiments, please refer to Figure 5-Figure 7 , Figure 6for Figure 5 A partial enlarged view of the middle A area; Figure 7 A partial structural schematic diagram of the first box wall 1 provided in some embodiments of the present application (showing the accommodating cavity 14 ). The insulating layer 13 and the wall body 11 together define the accommodating cavity 14 , and the heat-resistant layer 12 is disposed in the accommodating cavity 14 .

[0096] The insulating layer 13 may have a recess, and a receiving cavity 14 is formed between the wall surface of the recess and the outer surface of the wall body 11; the wall body 11 may have a recess, and a receiving cavity 14 is formed between the wall surface of the recess and the outer surface of the insulating layer 13; or both the insulating layer 13 and the outer surface of the wall body 11 may have recesses, and a receiving cavity 14 is formed between the walls of the two recesses.

[0097] There may be one or more accommodating cavities 14. At least one heat-resistant layer 12 is disposed in the accommodating cavity 14. The heat-resistant layer 12 may occupy part of the accommodating cavity 14, or the heat-resistant layer 12 may fill the accommodating cavity 14 completely.

[0098] By arranging the heat-resistant layer 12 in the accommodating cavity 14, the position of the heat-resistant layer 12 can be fixed, and the risk of the heat-resistant layer 12 being separated from the wall body 11 can be reduced. The heat-resistant layer 12 is closer to the battery cell 20 than the wall body 11. When the battery cell 20 is in thermal runaway, the high-temperature emissions in the battery cell 20 are sprayed toward the first box wall 1. The heat-resistant layer 12 can shield the wall body 11, thereby reducing the risk of the wall body 11 being damaged. In the embodiment where the heat-resistant layer 12 fills the accommodating cavity 14, the connection between the heat-resistant layer 12 and the wall body 11 is tighter, and when the first box wall 1 is squeezed by external force, the filled accommodating cavity 14 is not easy to dent, thereby reducing the risk of damage to the first box wall 1.

[0099] In some embodiments, please refer to Figure 5 and Figure 7 . The wall body 11 has a first surface 111 and a second surface 112 which are arranged opposite to each other along the thickness direction Z of the first box wall. The first surface 111 is arranged facing the battery cell 20, and the first surface 111 is provided with a groove 1111. The insulating layer 13 has a third surface 131, and the third surface 131 is connected to the first surface 111. The third surface 131 and the groove wall surface of the groove 1111 define a accommodating cavity 14. The first surface 111 and the first surface 111 can be planes or curved surfaces. The groove 1111 of the first surface 111 can be one or more. In the embodiment where there are multiple grooves 1111, the groove wall surface of each groove 1111 and the third surface 131 form an accommodating cavity 14. The third surface 131 can be in contact with the first surface 111, or the third surface 131 can be adhesively connected to the first surface 111.

[0100] The groove 1111 is a recessed portion provided in the wall body 11. The first surface 111 is provided facing the insulating layer 13, and the insulating layer 13 is closer to the battery cell 20 than the wall body 11. The first surface 111 is recessed in a direction away from the battery cell 20 to form the groove 1111, and the notch of the groove 1111 is located on the first surface 111. The notch of the groove 1111 is abutted against the third surface 131 to define the accommodating cavity 14, and the heat-resistant layer 12 is accommodated in the accommodating cavity 14.

[0101] In this embodiment, the groove 1111 helps to limit the installation position of the heat-resistant layer 12, and the third surface 131 and the groove wall of the groove 1111 define the accommodating cavity 14, which is convenient for the installation of the heat-resistant layer 12 and reduces the risk of the heat-resistant layer 12 being separated from the wall body 11. By providing the groove 1111, the heat-resistant layer 12 can be completely accommodated in the groove 1111, reducing the risk of interference with the battery cell 20 due to the protrusion of the groove 1111 toward the battery cell 20.

[0102] In some embodiments, please refer to Figure 8 , Figure 8 An exploded view of a battery device 100 provided in some embodiments of the present application (showing the insulating layer 13). The insulating layer 13 and the wall body 11 together define a plurality of accommodating cavities 14, each of which is provided with at least one heat-resistant layer 12, and along the thickness direction Z of the first box wall, the projection of each heat-resistant layer 12 covers the pressure relief mechanism 201 of at least one battery cell 20.

[0103] One heat-resistant layer 12 may be provided in one accommodating cavity 14, or multiple heat-resistant layers 12 may be provided in one accommodating cavity 14. In the embodiment in which multiple heat-resistant layers 12 are provided in the accommodating cavity 14, the multiple heat-resistant layers 12 are arranged at intervals. Along the thickness direction Z of the first box wall, each heat-resistant layer 12 may only cover the pressure relief mechanism 201 of one battery cell 20; or each heat-resistant layer 12 may cover the pressure relief mechanism 201 of multiple battery cells 20. By providing multiple accommodating cavities 14 and providing at least one heat-resistant layer 12 in each accommodating cavity 14, multiple heat-resistant layers 12 help to cover the pressure relief mechanisms 201 of the battery cells 20 respectively, reduce the use of the heat-resistant layers 12, and save costs. Compared with the heat-resistant layer 12 covering the first surface 111 of the entire wall body 11, by providing multiple accommodating cavities 14, the material use of the heat-resistant layer 12 can be reduced, and the weight of the first box wall 1 can also be reduced, which not only saves the material cost of the first box wall 1, but also improves the mass energy density of the first box wall 1.

[0104] In some embodiments, the insulating layer 13 is made of polyetheretherketone, polyimide or soluble polytetrafluoroethylene.

[0105] The insulating layer 13 can absorb the heat of the high-temperature exhaust of the battery cells 20 , reducing the risk of damage to the wall body 11 . The insulating layer 13 can also have good plasticity, which is beneficial to the installation of the heat-resistant layer 12 .

[0106] In some embodiments, please refer to Figure 5-Figure 9 , Fig. 9 The wall body 11 has a first surface 111 and a second surface 112 arranged opposite to each other along the thickness direction Z of the first box wall. The first surface 111 is provided with a groove 1111. At least part of the heat-resistant layer 12 is accommodated in the groove 1111.

[0107] The groove 1111 may be disposed on the side of the wall body 11 facing away from the battery cell 20, or on the side of the wall body 11 facing the battery cell 20. The heat-resistant layer 12 may be completely contained in the groove 1111; or only a portion of the heat-resistant layer 12 may be contained in the groove 1111, and the other portion may protrude from the first surface 111. The heat-resistant layer 12 may be bonded to the groove 1111, or the heat-resistant layer 12 may be interference-fitted with the groove wall of the groove 1111 to achieve the fixation of the heat-resistant layer 12. It is understood that the insulating layer 13 may be disposed on the side of the wall body 11 facing the battery cell 20, or may not be disposed.

[0108] By providing the groove 1111 on the wall body 11, the groove 1111 can locate the installation position of the heat-resistant layer 12, making the installation of the heat-resistant layer 12 more convenient. By providing the groove 1111, the heat-resistant layer 12 can be embedded in the groove 1111, so that the heat-resistant layer 12 is further away from the battery cell 20, reducing the risk of interference between the heat-resistant layer 12 and the battery cell 20.

[0109] In some embodiments, please refer to Figure 5-Figure 9 A protrusion 1121 is disposed at a position of the second surface 112 corresponding to the groove 1111 .

[0110] The second surface 112 partially protrudes away from the battery cell 20 to form a protrusion 1121. The first surface 111 of the wall body 11 may be pressed to form a groove 1111 on the first surface 111 and a protrusion 1121 on the second surface 112 accordingly.

[0111] In this embodiment, by providing a protrusion 1121 at a position corresponding to the groove 1111 on the second surface 112, the protrusion 1121 can enhance the strength of the wall body 11, and the protrusion 1121 can be formed correspondingly when the groove 1111 is formed, so that the processing of the groove 1111 is more convenient. The protrusion 1121 can indicate the position of the groove 1111, which is conducive to the installation of the first box wall 1.

[0112] In some embodiments, the first surface 111 is disposed facing the battery cell 20 .

[0113] The first surface 111 is disposed facing the battery cell 20, that is, the heat-resistant layer 12 is disposed between the battery cell 20 and the wall body 11, and the heat-resistant layer 12 is closer to the battery cell 20 than the wall body 11, and the heat-resistant layer 12 can protect the wall body 11. When the high-temperature emissions of the battery cell 20 are sprayed toward the first box wall 1, the heat-resistant layer 12 can shield the high-temperature emissions, reducing the risk of the wall body 11 contacting the heat-resistant layer 12 and being damaged by heat.

[0114] In some embodiments, please refer to Figure 8 The battery device 100 includes a battery cell assembly 20a, the battery cell assembly 20a includes a plurality of battery cells 20, the plurality of battery cells 20 are arranged along a first direction X, along a thickness direction Z of a first box wall, the projection of each heat-resistant layer 12 covers a pressure relief mechanism 201 of a battery cell 20 of the battery cell assembly 20a, and the thickness direction Z of the first box wall is perpendicular to the first direction X.

[0115] The pressure relief mechanism 201 of each battery cell 20 of the battery cell assembly 20a faces the first box wall 1. Along the thickness direction Z of the first box wall, the projection of one heat-resistant layer 12 covers the pressure relief mechanism 201 of each battery cell 20 of one battery cell assembly 20a.

[0116] By arranging each heat-resistant layer 12 to cover the pressure relief mechanism 201 of a battery cell 20 of a battery cell assembly 20a, it is helpful to arrange the heat-resistant layer 12, and it is also helpful to position and assemble the battery cell 20 and the box body 10. The heat-resistant layer 12 is arranged corresponding to the pressure relief mechanism 201 of multiple battery cells 20 of the battery cell assembly 20a, which can save the material use of the heat-resistant layer 12, so that the heat-resistant layer 12 can shield the high-temperature emissions sprayed by the pressure relief mechanism 201 of the battery cell 20, and can save the material cost of the first box wall 1.

[0117] In some embodiments, there are multiple battery cell assemblies 20a, and the multiple battery cell assemblies 20a are arranged along the second direction Y, and the thickness direction Z of the first box wall, the first direction X, and the second direction Y are perpendicular to each other.

[0118] As an example, Figure 8As shown, the insulating layer 13 and the wall body 11 jointly define four accommodating cavities 14, and the four accommodating cavities 14 are arranged at intervals along the second direction. A heat-resistant layer 12 is arranged in each accommodating cavity 14, and each heat-resistant layer 12 extends along the first direction. A plurality of battery cells 20 are arranged along the first direction X to form a battery cell assembly 20a, and four battery cell assemblies 20a are arranged along the second direction Y. Along the thickness direction Z of the first box cover, each heat-resistant layer 12 covers the pressure relief mechanism 201 of the plurality of battery cells 20 of a battery cell assembly 20a. By arranging the plurality of battery cell assemblies 20a along the second direction Y, each heat-resistant layer 12 correspondingly covers the pressure relief mechanism 201 of the battery cell 20 of a battery cell assembly 20a, which facilitates the positioning and installation of the heat-resistant layer 12, saves the material use of the heat-resistant layer 12, and improves the mass energy density of the battery device 100.

[0119] In some embodiments, the heat-resistant layer 12 is made of ceramic fiber cloth, pre-oxidized silk fiber, silica fiber felt or modified polyurethane. The heat-resistant layer 12 can have strong heat resistance, reduce the risk of the heat-resistant layer 12 being damaged by high temperature, and improve the reliability of the battery device 100.

[0120] In some embodiments, the wall body 11 has a Vickers hardness greater than or equal to 100 HV10.

[0121] The Vickers hardness of the wall body 11 may be 100 HV10 or greater than 100 HV10.

[0122] The Vickers hardness of the wall body 11 may be 100 HV10, 120 HV10, 140 HV10, 160 HV10, 180 HV10, 200 HV10, 250 HV10, 300 HV10, 350 HV10, 400 HV10, 450 HV10, 500 HV10, 600 HV10, 700 HV10, 800 HV10, 900 HV10, 1000 HV10, 2000 HV10, or the like.

[0123] In this embodiment, the wall body 11 has a Vickers hardness greater than or equal to 100 HV10, which can ensure that the wall body 11 has sufficient structural strength, thereby improving the strength of the first box wall 1 and reducing the risk of damage to the first box wall 1 when squeezed by external force.

[0124] In some embodiments, the box 10 includes a first box 2 and a cover 3, the first box 2 has an opening, the cover 3 closes the opening, and the cover 3 and the first box 2 together define a receiving space 10a. The cover 3 is the first box wall 1.

[0125] The cover 3 may be located at the top of the first box body 2 , or may be located at the bottom of the first box body 2 .

[0126] By setting the cover 3 as the first box wall 1, it is helpful to process the first box wall 1. The pressure relief mechanism 201 of the battery cell 20 exhausts air to the cover 3, which is helpful for normal pressure relief of the battery cell 20. In the embodiment where the cover 3 is located at the top of the first box body 2, the pressure relief mechanism 201 is arranged upward, and the pressure relief mechanism 201 can normally relieve pressure through the accommodating space 10a between the battery cell 20 and the first box wall 1, reducing the risk of the pressure relief mechanism 201 being blocked.

[0127] An embodiment of the present application provides an electrical device, including the battery device 100 provided by any one of the above embodiments, and the battery device 100 is used to provide electrical energy to the electrical device.

[0128] Please continue to refer to Figure 5-Figure 8 . The embodiment of the present application provides a battery device 100, including a case 10 and a battery cell 20. A accommodating space 10a is formed inside the case 10, and the case 10 has a cover 3. The battery cell 20 is arranged in the accommodating space 10a, and the battery cell 20 includes a pressure relief mechanism 201, and the pressure relief mechanism 201 is arranged toward the cover 3 along the thickness direction of the cover 3. Among them, the cover 3 includes a wall body 11 and a heat-resistant layer 12, and the heat-resistant layer 12 is arranged on the wall body 11, and the projection of the heat-resistant layer 12 covers the pressure relief mechanism 201 along the thickness direction of the cover 3. The wall body 11 also includes an insulating layer 13, and the insulating layer 13 and the wall body 11 jointly define a accommodating cavity 14, and the heat-resistant layer 12 is arranged in the accommodating cavity 14. The battery device 100 includes a battery cell assembly 20a, which includes multiple battery cells 20. The multiple battery cells 20 are arranged along a first direction X. Along the thickness direction Z of the first box wall, the projection of each heat-resistant layer 12 covers the pressure relief mechanism 201 of the battery cell 20 of a battery cell assembly 20a.

[0129] In the above embodiment, when the battery cell 20 is in thermal runaway, the high-temperature emissions inside the battery cell 20 are sprayed toward the first box wall 1 through the pressure relief mechanism 201, and the heat-resistant layer 12 can enhance the heat resistance of the first box wall 1, reduce the risk of damage to the first box wall 1, and thus reduce the risk of external airflow entering the box body 10 to aggravate thermal runaway. The insulating layer 13 insulates the isolation wall body 11 and the battery cell 20, thereby improving the insulation performance of the box body 10, reducing the risk of insulation failure of the battery cell 20, and improving the reliability of the battery device 100. The pressure relief mechanism 201 of the multiple battery cells 20 of a battery cell assembly 20a provided by the heat-resistant layer 12 is helpful for the setting of the heat-resistant layer 12, and also helps in the positioning and assembly of the battery cell 20 and the box body 10.

[0130] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0131] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, It is characterized in that include: A box body, with a containing space formed inside, and the box body has a first box wall; A battery cell is disposed in the accommodation space, wherein the battery cell comprises a pressure relief mechanism, and the pressure relief mechanism is disposed toward the first box wall along the thickness direction of the first box wall; The first box wall comprises a wall body and a heat-resistant layer, the heat-resistant layer is arranged on the wall body, and along the thickness direction of the first box wall, the projection of the heat-resistant layer covers the pressure relief mechanism.

2. The battery device according to claim 1, It is characterized in that The material damage temperature of the heat-resistant layer is greater than the material damage temperature of the wall body.

3. The battery device according to claim 1, It is characterized in that The material damage temperature of the heat-resistant layer is greater than or equal to 400°C.

4. The battery device according to claim 1, It is characterized in that The first box wall further includes an insulating layer, which is disposed on a side of the wall body facing the battery cell, and is configured to insulate and isolate the wall body from the battery cell.

5. The battery device according to claim 4, It is characterized in that The insulating layer and the wall body together define a containing cavity, and the heat-resistant layer is arranged in the containing cavity.

6. The battery device according to claim 5, It is characterized in that The wall body has a first surface and a second surface which are arranged opposite to each other along the thickness direction of the first box wall, the first surface is arranged facing the battery cell, and the first surface is provided with a groove; The insulating layer has a third surface, the third surface is connected to the first surface, and the third surface and the groove wall surface of the groove define the accommodating cavity.

7. The battery device according to claim 5, It is characterized in that The insulating layer and the wall body together define a plurality of accommodating cavities, each of which is provided with at least one of the heat-resistant layers. Along the thickness direction of the first box wall, the projection of each of the heat-resistant layers covers the pressure relief mechanism of at least one of the battery cells.

8. The battery device according to claim 4, It is characterized in that The insulating layer is made of polyetheretherketone, polyimide or soluble polytetrafluoroethylene.

9. The battery device according to any one of claims 1 to 8, It is characterized in that The battery device includes a battery cell assembly, and the battery cell assembly includes a plurality of battery cells. The plurality of battery cells are arranged along a first direction. Along the thickness direction of the first box wall, the projection of each heat-resistant layer covers the pressure relief mechanism of the plurality of battery cells of one battery cell assembly, and the thickness direction of the first box wall is perpendicular to the first direction.

10. The battery device according to claim 9, It is characterized in that There are a plurality of battery cell assemblies, and the plurality of battery cell assemblies are arranged along the second direction, and the thickness direction of the first box wall, the first direction, and the second direction are perpendicular to each other.

11. The battery device according to any one of claims 1 to 8, It is characterized in that The wall body comprises a first surface and a second surface which are arranged opposite to each other along the thickness direction of the first box wall. The first surface is provided with a groove, and at least a part of the heat-resistant layer is accommodated in the groove.

12. The battery device according to claim 11, It is characterized in that A protrusion is arranged at a position of the second surface corresponding to the groove.

13. The battery device according to claim 11, It is characterized in that The first surface is disposed facing the battery cell.

14. The battery device according to any one of claims 1 to 8, It is characterized in that The material of the heat-resistant layer is ceramic fiber cloth, pre-oxidized silk fiber, silica fiber felt or modified polyurethane.

15. The battery device according to any one of claims 1 to 8, It is characterized in that The wall body has a Vickers hardness greater than or equal to 100 HV10.

16. The battery device according to any one of claims 1 to 8, It is characterized in that The box body comprises a first box body and a cover body, the first box body has an opening, the cover body closes the opening, and the cover body and the first box body jointly define the accommodation space; The cover body is the first box wall.

17. An electrical device, It is characterized in that It comprises a battery device as described in any one of claims 1 to 16, wherein the battery device is used to provide electrical energy to the electrical device.

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