CN222214324U

CN222214324U - Battery device and electricity utilization device

Info

Publication number: CN222214324U
Application number: CN202422425930.3U
Authority: CN
Inventors: 杨辉; 王庆; 覃论
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-10-09
Filing date: 2024-10-09
Publication date: 2024-12-20
Anticipated expiration: 2034-10-09

Abstract

The application provides a battery device and an electricity utilization device. The battery device comprises a box body and a battery monomer. An accommodating space is formed in the box body, and the box body is provided with a first box wall. The battery monomer sets up in accommodation space, and the battery monomer includes pressure release mechanism, along the thickness direction of first case wall, pressure release mechanism sets up towards first case 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 the projection of the heat-resistant layer covers the pressure release mechanism along the thickness direction of the first box wall. The heat-resistant layer is arranged in the first tank wall, and the heat-resistant layer can strengthen the heat resistance of the first tank wall. When the single thermal runaway of battery, the inside high temperature emission of battery spouts to first case wall through relief mechanism, and the risk that first case wall damaged has been reduced in the setting of heat-resisting layer to reduce the risk that outside air current got into the box and aggravate thermal runaway, improved battery device's reliability.

Description

Battery device and electricity utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a battery device and an electricity utilization device.

Background

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

The battery device may generally include a case and a battery cell housed in the case. In the manufacturing process of the battery device, the reliability of the battery device is a non-negligible problem. Therefore, how to improve the reliability of the battery device is a technical problem to be solved in the battery technology.

Disclosure of utility model

The embodiment of the application provides a battery device and an electricity utilization device, which can improve the reliability of the battery device.

In a first aspect, an embodiment of the application provides a battery device, which comprises a box body and a battery unit, wherein an accommodating space is formed in the box body, the box body is provided with a first box wall, the battery unit is arranged in the accommodating space, the battery unit comprises a pressure release mechanism, the pressure release mechanism is arranged towards 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 the projection of the heat-resistant layer covers the pressure release mechanism along the thickness direction of the first box wall.

In the above technical scheme, the battery monomer is held in the box, and the box can protect the battery monomer, reduces the interference of external environment to the battery monomer. The heat-resistant layer is arranged in the first tank wall, and the heat-resistant layer can strengthen the heat resistance of the first tank wall. When the single thermal runaway of battery, the inside high temperature emission of battery spouts to first case wall through relief mechanism, and the risk that first case wall damaged has been reduced in the setting of heat-resisting layer to reduce the risk that outside air current got into the box and aggravate thermal runaway, improved battery device's reliability.

In some embodiments, the heat resistant layer has a material damage temperature greater than a material damage temperature of the wall body. Thus, 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 keep sealing of the battery cells, so that the risk that the first box wall is melted by high-temperature emissions to be damaged can be reduced, and the reliability of the battery device is improved.

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

In some embodiments, the first case wall further includes an insulating layer disposed on a side of the wall body facing the battery cell, the insulating layer configured to insulate the partition wall body from the battery cell. Through insulating barrier body and battery monomer of insulating layer, promote the insulating properties of box, reduce the risk of battery monomer insulation failure, improve battery device's reliability.

In some embodiments, the insulating layer and the wall body together define a receiving cavity, and the heat resistant layer is disposed within the receiving cavity. By arranging the heat-resistant layer in the accommodating cavity, the position of the heat-resistant layer can be fixed, and the risk that the heat-resistant layer is separated from the wall body is reduced.

In some embodiments, the wall body has a first surface and a second surface disposed opposite to each other in a thickness direction of the first case wall, the first surface being disposed facing the battery cell, the first surface being provided with a groove. The insulating layer is provided with a third surface, the third surface is connected with the first surface, and the third surface and the wall surface of the groove define a containing cavity. The groove is favorable for limiting the installation position of the heat-resistant layer, the third surface and the groove wall surface of the groove define a containing cavity, the heat-resistant layer is convenient to install, and the risk that the heat-resistant layer is separated from the wall body is reduced.

In some embodiments, the insulating layer and the wall body together define a plurality of receiving cavities, each receiving cavity being provided with at least one heat resistant layer therein, a projection of each heat resistant layer covering the pressure relief mechanism of at least one battery cell in the thickness direction of the first tank wall. Through setting up a plurality of holding the chamber, and set up at least one heat-resistant layer in every holding the chamber, a plurality of heat-resistant layers help covering battery single relief mechanism respectively, reduce the use of heat-resistant layer, practice thrift the cost.

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

In some embodiments, the battery device includes a battery cell assembly including a plurality of battery cells arranged along a first direction, and a projection of each heat resistant layer covers a pressure relief mechanism of the plurality of battery cells of the battery cell assembly along a thickness direction of the first wall, the thickness direction of the first wall being perpendicular to the first direction. Through setting up the single pressure release mechanism of battery of every heat-resisting layer cover a battery cell subassembly, help the setting of heat-resisting layer, also help the location assembly of battery cell and box.

In some embodiments, the plurality of battery cell assemblies are arranged along the second direction, and the thickness direction of the first case wall, the first direction and the second direction are perpendicular to each other. Through arranging a plurality of battery monomer components along the second direction, each heat-resistant layer corresponds the single pressure release mechanism of battery who covers a battery monomer component, and the location installation of heat-resistant layer of being convenient for saves the material use on heat-resistant layer.

In some embodiments, the wall body has a first surface and a second surface disposed opposite to each other in a thickness direction of the first tank wall, the first surface being provided with a groove, and at least a portion of the heat-resistant layer being accommodated in the groove. Through set up the recess on the wall body, the mounted position of heat-resisting layer can be fixed a position to the recess for the setting of heat-resisting layer is more convenient.

In some embodiments, the second surface is provided with protrusions at positions corresponding to the grooves. Therefore, the protrusions can be correspondingly formed when the grooves are formed, so that the grooves are more convenient to process.

In some embodiments, the first surface is disposed facing the battery cell. Through the first surface towards the battery monomer setting for the heat-resisting layer is closer to the battery monomer than the wall body, and the heat-resisting layer can protect the wall body, slows down the high temperature transmission that the high temperature emission in the battery monomer produced to the wall body, reduces the wall body and is heated the risk of being destroyed.

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

In some embodiments, the wall body is a vickers hardness greater than or equal to 100HV10. Like this, the wall body can promote the intensity of first case wall, reduces the risk that first case wall damaged when receiving external force extrusion.

In some embodiments, the case includes a first case having an opening and a cover closing the opening, the cover and the first case together defining a receiving space, the cover being a first case wall.

The cover body is arranged to be the first box wall, so that the processing of the first box wall is facilitated. The pressure release mechanism of the battery cell exhausts to the cover body, which is helpful for normal pressure release of the battery cell.

In a second aspect, an embodiment of the present application provides an electrical device, including a battery device provided in any one of the embodiments of the first aspect, where the battery device is configured to provide electrical energy to the electrical device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

Fig. 2 is an exploded view of a battery device according to some embodiments of the present application;

FIG. 3 is a cross-sectional view of a battery device provided in some embodiments of the application;

fig. 4 is an exploded view of a battery cell according to some embodiments of the present application;

FIG. 5 is a cross-sectional view of a first wall (illustrating an insulating layer) provided in some embodiments of the application;

FIG. 6 is an enlarged view of a portion of area A of FIG. 5;

FIG. 7 is a schematic view of a portion of a first wall structure (showing a receiving chamber) provided in some embodiments of the application;

fig. 8 is an exploded view of a battery device (illustrating an insulating layer) provided in some embodiments of the present application;

fig. 9 is an exploded view of a battery device according to still other embodiments of the present application.

Icons 1-first case 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 case, 3-cover;

10-box body, 10 a-containing space, 20-battery cell, 201-pressure release mechanism, 202-shell, 2021-shell, 2022-end cover, 203-electrode terminal, 204-electrode component and 20 a-battery cell component;

100-battery device, 200-controller, 300-motor, 1000-vehicle;

x-first direction, Y-second direction, Z-thickness direction of first tank wall.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, 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 in the description of this application in this application are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "comprising" and "having" and any variations thereof in the description of this application and the claims and the above description of the drawings are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate that a exists alone, while a and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

In the embodiment of the application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cells include, but are not limited to, lithium 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 storage batteries, and the like.

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

As examples, the battery cells may be cylindrical battery cells, prismatic battery cells, soft pack battery cells, or battery cells of other shapes, including square casing battery cells, blade-shaped battery cells, polygonal prismatic battery cells, such as hexagonal prismatic battery cells, and the like.

The battery device (Battery Apparatus) as referred to by embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include a plurality of battery cells connected in series, parallel, or series-parallel by a bus bar component.

In some embodiments, the Battery cell assembly (Battery Cell Assembly) is typically formed by arranging a plurality of Battery cells, and by way of example, the Battery cell assembly may be a Battery Module (Battery Module) formed by arranging and fixing a plurality of Battery cells to form a single Module.

As an example, the battery module may be formed by binding a plurality of battery cells by a tie.

In some embodiments, the battery device may be a battery Pack (battery Pack), which may include a case and one or more battery cell assemblies housed in the case.

As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the case in such a manner that the battery module is fixed in the case.

As an example, the battery cell assembly may be accommodated in the case by directly fixing a plurality of battery cells to the case.

As an example, the case may include a first case and a second case. The first box body and the second box body are buckled, so that a closed space is formed inside the box body to accommodate the battery cell assembly. The closing means covering or closing, and can be sealing or unsealing. The first housing may be a top cover or a bottom plate.

As an example, the case may 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 a closed space is formed inside the box body to accommodate the battery cell assembly.

As an example, the tank may be part of the chassis structure of the vehicle. For example, the roof of the tank may become at least part of the floor of the vehicle, or the frame of the tank may become at least part of the cross and longitudinal beams of the vehicle.

In some embodiments, the battery device refers to an energy storage device that includes a housing with a door on at least one side of the housing. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

For the battery cells, the main safety hazard comes from the charging and discharging process, and at the same time, the battery cells are generally provided with at least three protection measures for effectively avoiding unnecessary loss due to the proper environmental temperature design. In particular, the protective measures comprise at least a switching element, a selection of a suitable isolating membrane material and a pressure relief mechanism. The switching element is an element capable of stopping charging or discharging the battery when the temperature or resistance in the battery cell reaches a certain threshold. The isolating film is used for isolating the positive electrode plate and the negative electrode plate, and can automatically dissolve micro-scale (even nano-scale) micropores attached to the positive electrode plate and the negative electrode plate when the temperature rises to a certain value, so that metal ions cannot pass through the isolating film, and the internal reaction of the battery monomer is stopped.

A pressure relief mechanism refers to an element or component that actuates to relieve the internal pressure or temperature of a battery cell when the internal pressure or temperature reaches a predetermined threshold. The threshold design varies according to design requirements. The threshold value may depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell. The pressure release mechanism may take the form of, for example, an explosion-proof valve, an explosion-proof sheet, a gas valve, a pressure release valve, or a safety valve, and may specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure release mechanism performs an action or a weak structure provided in the pressure release mechanism is broken, thereby forming an opening or passage through which the internal pressure or temperature can be released.

The term "actuated" as used herein refers to the pressure relief mechanism being actuated or activated to a state such that the internal pressure and temperature of the battery cells are relieved. The action by the pressure relief mechanism may include, but is not limited to, at least a portion of the pressure relief mechanism breaking, crushing, tearing or opening, and the like. When the pressure release mechanism is actuated, high-temperature and high-pressure substances inside the battery cell are discharged outwards from the actuated position as emissions. In this way, the pressure and temperature of the battery cell can be relieved under the condition of controllable pressure or temperature, so that the occurrence of a potential serious accident is avoided.

Emissions from the battery cells referred to in the present application include, but are not limited to, electrolytes, dissolved or split positive and negative electrode sheets, fragments of separator films, high temperature and pressure gases generated by the reaction, flames, etc.

The pressure release mechanism on the battery cell has an important influence on the safety of the battery device. For example, when a short circuit, overcharge, or the like occurs, thermal runaway may occur inside the battery cell, and thus pressure or temperature rises. In this case, the internal pressure and temperature can be released outwards by actuating the pressure release mechanism, so that the risks of explosion and ignition of the battery cells are reduced. The technical scheme described in the embodiment of the application is applicable to various electric devices using battery monomers and battery devices, such as mobile phones, portable equipment, notebook computers, battery cars, electric toys, electric tools, vehicles, ships, spacecraft and the like, and for example, the spacecraft comprises planes, rockets, spaceships, spacecraft and the like.

For the battery device, in order to promote the performance stability of the battery monomer, the interference of external components to the normal use of the battery monomer is reduced, the battery monomer can be arranged in a box body, the box body can seal the battery monomer, the protection is provided for the battery monomer, and the service performance of the battery monomer is improved. When thermal runaway occurs in the battery cells in the tank, the pressure relief mechanism of the battery cells is actuated to spray the high temperature emissions onto the walls of the tank. However, the high-temperature discharge of the battery monomer is sprayed to the tank wall, so that the tank wall is easily heated and melted to be damaged, external air flow easily enters the inside of the tank body through the damaged part of the tank wall, the thermal runaway of the battery monomer is increased, and the risk of ignition and explosion of the battery device is increased.

In view of this, in order to reduce the risk of fire and explosion of the battery device, the embodiment of the application provides a battery device, which includes a case and a battery cell, the case has a first case wall, and a pressure release mechanism of the battery cell is disposed toward the first case wall. The first tank wall comprises a wall body and a heat-resistant layer, and the projection of the heat-resistant layer covers the pressure release mechanism along the thickness direction of the first tank wall.

Through setting up first case wall, when battery monomer thermal runaway, the inside high temperature emission of battery monomer spouts to first case wall through relief mechanism, and the heat resistance of first case wall can be strengthened to the heat-resisting layer, reduces the risk that first case wall damaged to reduce outside air current and get into the inside risk of aggravating thermal runaway of box, improved battery device's reliability.

For convenience of explanation, the following embodiments take electric equipment as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The battery device 100 is provided in the interior of the vehicle 1000, and the battery device 100 may be provided at the bottom or at the head or at the tail of the vehicle 1000. The battery device 100 may be used for power supply of the vehicle 1000, for example, the battery device 100 may serve as an operating power source of the vehicle 1000.

The vehicle 1000 may further include a controller 200 and a motor 300, the controller 200 being configured to control the battery device 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, the battery device 100 may not only serve as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery device 100 according to some embodiments of the present application, the battery device 100 may include a case 10 and a battery cell 20, where the case 10 is used to accommodate the battery cell 20.

Wherein a closed space for accommodating the battery cell 20 is formed inside the case 10. The case 10 may take a variety of configurations. In some embodiments, the case 10 may include a first case 2 and a cover 3, where the first case 2 and the cover 3 are fastened to each other. The first casing 2 and the cover 3 may be of various shapes, such as a rectangular parallelepiped, a cylinder, and the like. The first casing 2 may have a hollow structure with one side opened, and the cover 3 may have a hollow structure with one side opened, and the open side of the cover 3 and the open side of the first casing 2 are fastened to each other to form the casing 10 having a closed space. The first case 2 may have a hollow structure with one side opened, and the cover 3 may have a plate-like structure, and the cover 3 may be fastened to the open side of the first case 2 to form the case 10 having the accommodation space 10 a.

In the battery device 100, the number of battery cells 20 may be one or more. If there are multiple battery cells 20, the multiple battery cells 20 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to that there are both series connection and parallel connection among the multiple battery cells 20. The battery modules can be formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and then the battery modules are connected in series or parallel or series-parallel connection to form a whole and are accommodated in the box body 10. All the battery cells 20 may be directly connected in series, parallel or series-parallel, and then the whole body formed by all the battery cells 20 is accommodated in the case 10. Illustratively, as shown in fig. 2, the first case 2 has a hollow structure with one side opened, the cover 3 has a plate-like structure, and the cover 3 is fastened to the open side of the first case 2 to form a case 10 having a receiving space 10 a. A plurality of battery cells 20 are accommodated in the accommodation space 10 a.

In some embodiments, the battery device 100 may further include a bus member through which the plurality of battery cells 20 may be electrically connected to each other to realize serial connection or parallel connection or series-parallel connection of the plurality of battery cells 20. The bus member may be a metal conductor such as copper, iron, aluminum, stainless steel, aluminum alloy, or the like.

Referring to fig. 2-4, fig. 3 is a cross-sectional view of a battery device 100 according to some embodiments of the present application, and fig. 4 is an exploded view of a battery cell 20 according to some embodiments of the present application. The embodiment of the application provides a battery device 100, which comprises a box body 10 and a battery cell 20. The housing 10 has a housing space 10a formed therein, and the housing 10 has a first wall 1. The battery cell 20 is disposed in the accommodating space 10a, and the battery cell 20 includes a pressure release mechanism 201, and the pressure release mechanism 201 is disposed toward the first case wall 1 along the thickness direction Z of the first case wall. The first tank wall 1 includes a wall body 11 and a heat-resistant layer 12, the heat-resistant layer 12 is disposed on the wall body 11, and a projection of the heat-resistant layer 12 covers the pressure release mechanism 201 along a thickness direction Z of the first tank wall.

The first casing 2 and the cover 3 may be bonded, clamped or welded to form a casing 10 having an accommodating space 10 a. The first tank wall 1 may be a wall portion of the first tank 2, or the first tank wall 1 may be a wall portion of the lid 3.

The number of the battery cells 20 may be one or more.

In an embodiment in which the battery cell 20 is one, the pressure relief mechanism 201 of the battery cell 20 is arranged towards the first tank wall 1.

In the embodiment where there are a plurality of battery cells 20, there may be one heat-resistant layer 12, and the projection of one heat-resistant layer 12 covers the pressure release mechanisms 201 of a plurality of battery cells 20 along the thickness direction Z of the first wall, and there may be a plurality of heat-resistant layers 12, and the projection of each heat-resistant layer 12 covers at least one pressure release mechanism 201 of a battery cell 20 along the thickness direction Z of the first wall.

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 disposed in the housing 202, the electrode terminal 203 is electrically connected with the electrode assembly 204, and the electrode assembly 204 is electrically connected with external components through the electrode terminal 203 to achieve charging or discharging of the battery cell 20. The pressure release mechanism 201 and the electrode terminal 203 may be provided on the same wall portion of the case 202 or may be provided on different wall portions. As an example, as shown in fig. 3 and 4, the case 202 includes a case 2021 and an end cap 2022, the case 2021 has a mouth, the end cap 2022 closes the mouth of the case 2021, so that the end cap 2022 and the case 2021 form a receiving chamber that receives the electrode assembly 204, the pressure release mechanism 201 and the electrode terminal 203 of the battery cell 20 are both provided at the end cap 2022, and the end cap 2022 is provided toward the first case wall 1, so that the pressure release mechanism 201 is provided toward the first case wall 1.

The heat-resistant layer 12 may be disposed on a side of the wall body 11 facing away from the battery cell 20, or the heat-resistant layer 12 may be disposed on a side of the wall body 11 facing toward 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 is clamped to the wall body 11, or the heat-resistant layer 12 may be indirectly connected to the wall body 11, for example, the heat-resistant layer 12 is bonded to the wall body 11 through heat-resistant glue.

The projection of the heat-resistant layer 12 in the thickness direction Z of the first tank wall may be entirely overlapped with the projection of the wall body 11 in the thickness direction Z of the first tank wall, or the projection of the heat-resistant layer 12 in the thickness direction Z of the first tank wall may be overlapped with only a part of the projection of the wall body 11 in the thickness direction Z of the first tank wall. The projection of the heat resistant layer 12 covers the pressure relief mechanism 201, i.e. in a projection plane perpendicular to the thickness direction Z of the first tank 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 tank wall, only a part of the projection of the pressure release mechanism 201 may overlap with the projection of the heat-resistant layer 12, or the projection of the pressure release mechanism 201 may completely overlap with the projection of the heat-resistant layer 12.

The heat-resistant layer 12 may be polyimide, aluminosilicate ceramic, ceramic fiber cloth, pre-oxidized fiber, silica fiber felt or modified polyurethane.

In the embodiment of the application, the battery cell 20 is accommodated in the box 10, and the box 10 can protect the battery cell 20 and reduce interference of external environment to the battery cell 20. The heat-resistant layer 12 is provided in the first tank wall 1, and the heat-resistant layer 12 can enhance the heat resistance of the first tank wall 1. When the battery monomer 20 is in thermal runaway, high-temperature emissions inside the battery monomer 20 are sprayed to the first tank wall 1 through the pressure release mechanism 201, the heat resistance of the first tank wall 1 can be enhanced by the heat resistant layer 12, the risk of damage to the first tank wall 1 is reduced, the risk of external air flow entering the tank body 10 to exacerbate the thermal runaway is reduced, and the reliability of the battery device 100 is improved. 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 compression.

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.

The melting point of the material may be used as the material damage temperature, or the decomposition temperature of the material may be used as the material damage temperature. If the material has a melting point and no decomposition temperature, the melting point is the material damage temperature, if the material has a decomposition temperature and no melting point, the decomposition temperature is the material damage temperature, and if the material has both the melting point and the decomposition temperature, the smaller of the melting point and the decomposition temperature is the material damage temperature.

Taking polyimide with melting point and decomposition temperature as an example of the material of the heat-resistant layer 12, the melting point of the heat-resistant layer 12 is 430 ℃, the decomposition temperature of the heat-resistant layer 12 is 510 ℃, and the melting point of the heat-resistant layer is less than the decomposition temperature of the heat-resistant layer, the melting point of the heat-resistant layer 12 is the material damage temperature of the heat-resistant layer 12.

Further, taking the aluminosilicate ceramic having only the decomposition temperature as an example of the material of the heat-resistant layer 12, the decomposition temperature of the heat-resistant layer 12 is the material damage temperature of the heat-resistant layer 12 when the heat-resistant layer 12 has no melting point.

In the present 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, and when the wall body 11 is damaged by heat, the heat-resistant layer 12 can maintain the seal of the battery cell 20, and the risk of damage of the first case wall 1 by melting of high-temperature emissions can be reduced, thereby improving the reliability of the battery device 100.

In some embodiments, the material damage temperature of the heat resistant layer 12 is greater than or equal to 400 ℃.

The material damage temperature of the heat resistant layer 12 may be 400 ℃, 500 ℃, 600 ℃, 700 ℃, 800 ℃, 900 ℃, 1000 ℃, 1100 ℃, 1200 ℃, 1300 ℃, 1400 ℃, 1500 ℃, 1600 ℃, 1700 ℃, 1800 ℃, 1900 ℃, 2000 ℃, etc. The heat resistant layer 12 may be a metallic material or a non-metallic material, and for example, the heat resistant layer 12 may be ceramic, nickel alloy or asbestos. In an embodiment in which 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 the heat-resistant layer 12 from the battery cell 20.

By setting the material damage temperature of the heat-resistant layer 12 to 400 ℃ or higher, the risk of the heat-resistant layer 12 being damaged by the thermal runaway high temperature can be reduced. When thermal runaway occurs in the battery cell 20, high-temperature emissions in the battery cell 20 are sprayed from the pressure release mechanism 201 to the first tank wall 1, and the heat-resistant layer 12 can resist the high temperature of the high-temperature emissions, so that the risk that the high-temperature emissions melt the first tank wall 1 is reduced, and the heat resistance of the first tank wall 1 is improved. In an embodiment in which the material damage temperature of the heat-resistant layer 12 is greater than that of the wall body 11, the heat-resistant layer 12 can maintain the sealing of the battery cells 20 within the case 10 even if the wall body 11 is partially melted by the high temperature, reducing the risk of exacerbation of thermal runaway of the battery cells 20.

In some embodiments, referring to fig. 5, fig. 5 is a cross-sectional view of a first wall 1 (illustrating an insulating layer 13) according to some embodiments of the present application. The first case wall 1 further includes an insulating layer 13, the insulating layer 13 being disposed on a side of the wall body 11 facing the battery cell 20, the insulating layer 13 being configured to insulate the wall body 11 from the battery cell 20.

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 be indirectly connected to the wall body 11, for example, the insulating layer 13 may be bonded to the wall body 11 by a heat-resistant adhesive. Along the thickness direction Z of the first 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 a direction away from the wall body 11 and pass through the insulating layer 13 so that a portion of the heat-resistant layer 12 is closer to the battery cell 20 than the insulating layer 13.

Insulating layer 13 insulates partition wall body 11 and battery cell 20, improves the insulating properties of box 10, reduces the risk of battery cell 20 insulation failure, improves the reliability of battery device 100.

In some embodiments, please refer to fig. 5-7, fig. 6 is a partially enlarged view of a region a in fig. 5, and fig. 7 is a schematic view of a portion of the first wall 1 (illustrating the accommodating cavity 14) according to some embodiments of the present application. The insulating layer 13 and the wall body 11 together define a receiving chamber 14, and the heat-resistant layer 12 is disposed within the receiving chamber 14.

The insulating layer 13 may have a recess, and the housing chamber 14 may be 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 the housing chamber 14 may be formed between the wall surface of the recess and the outer surface of the insulating layer 13, or the housing chamber 14 may be formed between the wall surfaces of the insulating layer 13 and the wall body 11.

The number of the accommodating chambers 14 may be one or a plurality. At least one heat resistant layer 12 is disposed in the receiving chamber 14. The heat-resistant layer 12 may occupy part of the space of the accommodating chamber 14, or the heat-resistant layer 12 may fill the accommodating chamber 14.

By disposing the heat-resistant layer 12 in the accommodation chamber 14, the position of the heat-resistant layer 12 can be fixed, reducing the risk of the heat-resistant layer 12 coming off the wall body 11. The heat-resistant layer 12 is closer to the battery cell 20 than the wall body 11, and when the battery cell 20 is thermally out of control, high-temperature emissions in the battery cell 20 are sprayed to the first tank wall 1, and the heat-resistant layer 12 can shield the wall body 11, so that the risk of damage to the wall body 11 is reduced. In the embodiment in which the heat-resistant layer 12 fills the accommodating chamber 14, the connection between the heat-resistant layer 12 and the wall body 11 is tighter, and the filled accommodating chamber 14 is less likely to be dented when the first tank wall 1 is pressed by an external force, thereby reducing the risk of damage to the first tank wall 1.

In some embodiments, please continue to refer to fig. 5 and 7. The wall body 11 has a first surface 111 and a second surface 112 that are disposed opposite to each other in the thickness direction Z of the first case wall, the first surface 111 being disposed facing the battery cell 20, the first surface 111 being provided with a groove 1111. The insulating layer 13 has a third surface 131, the third surface 131 being connected to the first surface 111, the third surface 131 and the wall surface of the recess 1111 defining the accommodation chamber 14. The first surface 111 and the first surface 111 may be planar or curved. The number of grooves 1111 in the first surface 111 may be one or more. In embodiments in which there are a plurality of grooves 1111, the wall surface of each groove 1111 and the third surface 131 form a receiving cavity 14. The third surface 131 may be bonded to the first surface 111, or the third surface 131 may be bonded to the first surface 111.

The groove 1111 is a recess provided in the wall body 11. The first surface 111 is disposed 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 a groove 1111, and a notch of the groove 1111 is located on the first surface 111. The notch of the groove 1111 abuts against the third surface 131 to define the accommodating chamber 14, and the heat resistant layer 12 is accommodated in the accommodating chamber 14.

In the present 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 surface of the groove 1111 define the accommodation chamber 14, which facilitates the installation of the heat-resistant layer 12, and reduces the risk of the heat-resistant layer 12 being detached 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.

In some embodiments, referring to fig. 8, fig. 8 is an exploded view of a battery device 100 (illustrating an insulating layer 13) according to some embodiments of the present application. The insulating layer 13 and the wall body 11 together define a plurality of receiving cavities 14, each receiving cavity 14 being provided with at least one heat resistant layer 12, the projection of each heat resistant layer 12 covering the pressure relief mechanism 201 of at least one battery cell 20 in the thickness direction Z of the first tank wall.

One heat-resistant layer 12 may be provided in one accommodation chamber 14, or a plurality of heat-resistant layers 12 may be provided in one accommodation chamber 14. In the embodiment in which the plurality of heat resistant layers 12 are provided in the accommodation chamber 14, the plurality of heat resistant layers 12 are provided at intervals. In the thickness direction Z of the first case wall, the pressure release mechanism 201 may be formed by covering only one battery cell 20 per heat-resistant layer 12, or the pressure release mechanism 201 may be formed by covering a plurality of battery cells 20 with an inner heat-resistant layer 12. By providing a plurality of receiving chambers 14, and providing at least one heat resistant layer 12 in each receiving chamber 14, the plurality of heat resistant layers 12 facilitate the respective covering of the pressure relief mechanisms 201 of the battery cells 20, reducing the use of the heat resistant layers 12, and saving costs. Compared with the heat-resistant layer 12 covering the whole first surface 111 of the wall body 11, the material usage of the heat-resistant layer 12 can be reduced and the weight of the first tank wall 1 can be reduced by arranging the plurality of accommodating cavities 14, so that the material cost of the first tank wall 1 is saved and the mass energy density of the first tank wall 1 is improved.

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

The insulating layer 13 can absorb heat of high temperature discharge of the battery cell 20, reduce risk of damage to the wall body 11, and the insulating layer 13 can also have good plasticity, facilitating installation of the heat-resistant layer 12.

In some embodiments, referring to fig. 5-9, fig. 9 is an exploded view of a battery device 100 according to still other embodiments of the present application. The wall body 11 has a first surface 111 and a second surface 112 that are disposed opposite to each other in the thickness direction Z of the first tank wall, the first surface 111 being provided with a groove 1111, and at least part of the heat-resistant layer 12 being accommodated in the groove 1111.

The groove 1111 may be disposed on a side of the wall body 11 facing away from the battery cell 20, or may be disposed on a side of the wall body 11 facing the battery cell 20. It is possible that the heat-resistant layer 12 is entirely accommodated in the groove 1111, or that only a part of the heat-resistant layer 12 is accommodated in the groove 1111 and another part protrudes from the first surface 111. The heat-resistant layer 12 may be adhered in the groove 1111, or the heat-resistant layer 12 may be in interference fit with the wall surface of the groove 1111, so as to fix the heat-resistant layer 12. It is understood that the side of the wall body 11 facing the battery cell 20 may be provided with the insulating layer 13 or may not be provided with the insulating layer 13.

By providing the groove 1111 on the wall body 11, the groove 1111 can locate the installation position of the heat resistant layer 12, so that the installation of the heat resistant layer 12 is 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.

In some embodiments, please continue to refer to fig. 5-9. The second surface 112 is provided with protrusions 1121 at positions corresponding to the grooves 1111.

The second surface 112 is partially protruded in a direction away from the battery cell 20 to form a protrusion 1121. It is possible to press the first surface 111 of the wall body 11 to form the groove 1111 in the first surface 111 and the protrusion 1121 in the second surface 112.

In the present embodiment, by providing the protrusions 1121 at the positions of the second surface 112 corresponding to the grooves 1111, the protrusions 1121 can enhance the strength of the wall body 11, and the protrusions 1121 can be correspondingly formed when the grooves 1111 are formed, so that the processing of the grooves 1111 is more convenient. The projection 1121 can indicate the position of the recess 1111, facilitating the installation of the first tank wall 1.

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

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, 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 discharge of the battery cell 20 is sprayed toward the first case wall 1, the heat-resistant layer 12 can shield the high-temperature discharge, reducing the risk of the wall body 11 contacting the heat-resistant layer 12 to be damaged by heat.

In some embodiments, please continue to refer to fig. 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, a projection of each heat-resistant layer 12 covers a pressure release mechanism 201 of the battery cell 20 of the battery cell assembly 20a along a thickness direction Z of the first case wall, and the thickness direction Z of the first case wall is perpendicular to the first direction X.

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

By providing the pressure release mechanism 201 of the battery cells 20 with each heat resistant layer 12 covering one battery cell assembly 20a, the arrangement of the heat resistant layers 12 is facilitated, as well as the positioning assembly of the battery cells 20 and the case 10. The heat-resistant layer 12 is arranged corresponding to the pressure release mechanisms 201 of the plurality of battery cells 20 of the battery cell assembly 20a, so that the material use of the heat-resistant layer 12 can be saved, the heat-resistant layer 12 can shield high-temperature emissions sprayed by the pressure release mechanisms 201 of the battery cells 20, and the material cost of the first box wall 1 can be saved.

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

As an example, as shown in fig. 8, the insulating layer 13 and the wall body 11 together define four accommodation chambers 14, and the four accommodation chambers 14 are disposed at intervals in the second direction. One heat-resistant layer 12 is provided in each accommodation chamber 14, and each heat-resistant layer 12 extends in the first direction. The plurality of battery cells 20 are arranged along the first direction X to form a battery cell assembly 20a, the four battery cell assemblies 20a are arranged along the second direction Y, and each heat-resistant layer 12 covers the pressure release mechanism 201 of the plurality of battery cells 20 of one battery cell assembly 20a along the thickness direction Z of the first case cover. Through arranging a plurality of battery cell assemblies 20a along the second direction Y, each heat-resistant layer 12 corresponds to the pressure release mechanism 201 of the battery cell 20 covering one battery cell assembly 20a, so that the positioning and the installation of the heat-resistant layer 12 are facilitated, the material use of the heat-resistant layer 12 is saved, and the quality energy density of the battery device 100 is improved.

In some embodiments, the heat resistant layer 12 is made of ceramic fiber cloth, pre-oxidized 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.

In some embodiments, the wall body 11 is a vickers hardness greater than or equal to 100HV10.

The wall body 11 may have a vickers hardness of 100HV10 or more than 100HV10.

The wall body 11 may have a vickers hardness of 100HV10、120HV10、140HV10、160HV10、180HV10、200HV10、250HV10、300HV10、350HV10、400HV10、450HV10、500HV10、600HV10、700HV10、800HV10、900HV10、1000HV10、2000HV10 or the like.

In the present embodiment, the wall body 11 has a vickers hardness of 100HV10 or more, so that the wall body 11 has sufficient structural strength, thereby improving the strength of the first tank wall 1 and reducing the risk of damage to the first tank wall 1 when pressed by an external force.

In some embodiments, the case 10 includes a first case 2 and a cover 3, the first case 2 having an opening, the cover 3 closing the opening, the cover 3 and the first case 2 together defining a receiving space 10a. The cover 3 is a first tank wall 1.

The cover 3 may be located at the top of the first casing 2 or may be located at the bottom of the first casing 2.

By providing the cover 3 as the first tank wall 1, processing of the first tank wall 1 is facilitated. The pressure release mechanism 201 of the battery cell 20 exhausts to the cover 3, which is helpful for normal pressure release of the battery cell 20. In the embodiment in which the cover 3 is located at the top of the first case 2, the pressure relief mechanism 201 is disposed upward, and the pressure relief mechanism 201 can normally relieve pressure through the accommodating space 10a between the battery cell 20 and the first case wall 1, so as to reduce the risk of the pressure relief mechanism 201 being blocked.

The embodiment of the application provides an electric device, which comprises the battery device 100 provided by any one of the embodiments, wherein the battery device 100 is used for providing electric energy for the electric device.

Please continue to refer to fig. 5-8. The embodiment of the application provides a battery device 100, which comprises a box body 10 and a battery cell 20. The housing 10 has a housing space 10a formed therein, and the housing 10 has a cover 3. The battery cell 20 is disposed in the accommodating space 10a, and the battery cell 20 includes a pressure release mechanism 201, and the pressure release mechanism 201 is disposed toward the cover 3 along the thickness direction of the cover 3. The cover 3 includes a wall body 11 and a heat-resistant layer 12, the heat-resistant layer 12 is disposed on the wall body 11, and a projection of the heat-resistant layer 12 covers the pressure release mechanism 201 along a thickness direction of the cover 3. The wall body 11 further comprises an insulating layer 13, the insulating layer 13 and the wall body 11 together defining a receiving cavity 14, the heat resistant layer 12 being disposed within the receiving cavity 14. 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, and along a thickness direction Z of a first wall, a projection of each heat-resistant layer 12 covers a pressure release mechanism 201 of the battery cell 20 of the battery cell assembly 20 a.

In the above embodiment, when the battery cell 20 is thermally out of control, the high-temperature exhaust inside the battery cell 20 is sprayed to the first tank wall 1 through the pressure release mechanism 201, and the heat-resistant layer 12 can enhance the heat resistance of the first tank wall 1, reduce the risk of damage to the first tank wall 1, and thereby reduce the risk of external air flow entering the interior of the tank 10 to exacerbate thermal out of control. Insulating layer 13 insulates partition wall body 11 and battery cell 20, improves the insulating properties of box 10, reduces the risk of battery cell 20 insulation failure, improves the reliability of battery device 100. The arrangement of the heat-resistant layer 12 is facilitated by the pressure release mechanism 201 of the plurality of battery cells 20, which is provided with the heat-resistant layer 12 covering one battery cell assembly 20a, and the positioning assembly of the battery cells 20 and the case 10 is also facilitated.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

The above embodiments are only for illustrating the technical solution of the present application, and are not intended to limit the present application, and various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery device, comprising:

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 , wherein a material damage temperature of the heat-resistant layer is greater than a material damage temperature of the wall body.

3 . The battery device according to claim 1 , wherein the material damage temperature of the heat-resistant layer is greater than or equal to 400° C. 4 .

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

5 . The battery device according to claim 4 , wherein the insulating layer and the wall body jointly define a receiving cavity, and the heat-resistant layer is disposed in the receiving cavity.

6. The battery device according to claim 5, characterized in that 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, 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 as described in claim 5 is characterized in that the insulating layer and the wall body jointly define a plurality of accommodating cavities, each of which is provided with at least one of the heat-resistant layers, and 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 , wherein the insulating layer is made of polyetheretherketone, polyimide or soluble polytetrafluoroethylene.

9. A battery device as described in any one of claims 1-8, characterized in that 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 mechanisms 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 , wherein there are a plurality of battery cell assemblies, the plurality of battery cell assemblies are arranged along a second direction, and a 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, characterized in that 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, 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 , wherein a protrusion is provided at a position of the second surface corresponding to the groove.

13 . The battery device according to claim 11 , wherein the first surface is disposed facing the battery cell.

14. The battery device according to any one of claims 1 to 8, characterized in that the heat-resistant layer is made of 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, 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, 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, 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 for the electrical device.