CN222896740U

CN222896740U - Battery devices and power-consuming devices

Info

Publication number: CN222896740U
Application number: CN202520418651.6U
Authority: CN
Inventors: 陈慧玺; 柯剑煌; 陈世龙; 严岩
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2025-03-11
Filing date: 2025-03-11
Publication date: 2025-05-23
Anticipated expiration: 2035-03-11

Abstract

The present application provides a battery device and an electric device. The battery device includes a box, a battery cell and a heat insulating member. At least two battery cells are contained in the box and arranged along a first direction. The battery cell includes a shell. The shell includes two side walls arranged opposite to each other along the first direction. The side walls include a first wall portion and a second wall portion. The first wall portion is arranged at at least one end of the second wall portion in the second direction. The dimension of the first wall portion in the third direction is smaller than the dimension of the second wall portion in the third direction. The heat insulating member includes a first heat insulating portion. By arranging the first heat insulating portion between the first wall portions of two adjacent battery cells, the problem of mutual influence between the first wall portion of the battery cell and other surrounding devices in terms of temperature is improved, which helps to stabilize the temperature of the battery cell and improve the performance of the battery device.

Description

Battery device and electricity utilization device

Technical Field

The present application relates to the field of batteries, and in particular, to a battery device and an electric device.

Background

Battery devices are widely used in electronic equipment such as cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like.

In the related art, a battery device generally includes a plurality of battery cells disposed in a case, and high temperature generated during operation of the battery cells may affect surrounding devices, resulting in degradation of the battery device, and improvement is desired.

Disclosure of utility model

In view of the above, the present application provides a battery device and an electric device, which can improve the problem that the heat of the battery cell affects the surrounding devices, and is helpful to improve the performance of the battery device.

The application provides a battery device which comprises a box body, battery units and heat insulation pieces, wherein at least two battery units are accommodated in the box body and are arranged along a first direction, each battery unit comprises a shell, each shell comprises two side walls which are oppositely arranged along the first direction, each side wall comprises a first wall part and a second wall part, the first wall parts are arranged at least one end of each second wall part in the second direction, the size of each first wall part in the third direction is smaller than that of each second wall part in the third direction, the first direction, the second direction and the third direction are intersected, and the heat insulation pieces comprise first heat insulation parts, and the first heat insulation parts are arranged between the first wall parts of two adjacent battery units.

In the scheme of the embodiment of the application, the battery device comprises a box body, battery cells and a heat insulating piece, at least two battery cells are accommodated in the box body and are arranged along a first direction, the battery cells comprise a shell, the shell comprises two side walls which are oppositely arranged along the first direction, each side wall comprises a first wall part and a second wall part, the first wall part is arranged at least one end of the second wall part in the second direction, the size of the first wall part in the third direction is smaller than that of the second wall part in the third direction, the heat insulating piece comprises a first heat insulating part, and the first heat insulating part is arranged between the first wall parts of two adjacent battery cells so as to solve the problem that the first wall parts of the battery cells and other surrounding devices are mutually influenced in temperature, thereby being beneficial to stabilizing the temperature of the battery cells and improving the performance of the battery device.

In some embodiments, the battery cell further includes an end cap assembly and an electrode assembly, the housing includes an opening in at least one side of the second direction, the electrode assembly is received in the housing, the end cap assembly includes an end cap plate and an electrode terminal that are connected to each other, the end cap plate covers the opening, the electrode assembly and the electrode terminal are connected, the thermal shield further includes an insulating portion disposed on a side of the end cap plate facing away from the electrode assembly, and the insulating portion is connected to the first thermal shield at least one end of the insulating portion in the first direction.

In the scheme of the embodiment of the application, the heat insulating piece further comprises an insulating part arranged on one side of the end cover plate, which is away from the shell, wherein the insulating part is used for improving the insulating performance of the end cover assembly and surrounding devices, the first heat insulating part is connected to at least one end of the insulating part in the first direction, and the first heat insulating part and the insulating part are integrated together, so that the first heat insulating part can be fixed through the insulating part, the falling risk of the first heat insulating part is reduced, the processing steps of the battery device are simplified, and the productivity of the battery device is improved.

In some embodiments, the end cap plate includes a protrusion and two connection portions, the two connection portions are provided on both sides of the protrusion in a second direction thereof, the electrode terminal is provided on the connection portion, the protrusion is provided protruding in a direction away from the electrode assembly with respect to the connection portion, the second wall portion is connected with the connection portion, the first wall portion is connected with the protrusion, the insulation portion includes a first portion and a second portion that are connected with each other, the first portion is provided on the protrusion, the second portion is provided on the connection portion, and the first heat insulation portion is connected with the first portion.

In the scheme of the embodiment of the application, the protruding part is arranged on the end cover plate to help increase the internal space of the shell, the capacity of the battery cell is improved, the first part is arranged on the protruding part, and the first heat insulation part is connected with the first part, so that the first heat insulation part is conveniently arranged on the first wall part, the size of the first heat insulation part is reduced, and the cost of the heat insulation part is reduced.

In some embodiments, the thermal shield further comprises a second thermal shield, at least a portion of the second thermal shield being disposed between the second wall portions of adjacent two of the battery cells.

In the scheme of the embodiment of the application, the size of the heat insulation piece is increased by arranging the second heat insulation part, so that the influence of the heat of the battery monomer on surrounding devices is reduced, and the performance of the battery device is improved.

In some embodiments, the first and second insulation portions are integrally formed or the first and second insulation portions are integrally formed.

In the scheme of the embodiment of the application, the first heat insulation part and the second heat insulation part are integrally formed, so that the material utilization rate is high and the processing cost is low, or the first heat insulation part and the second heat insulation part are integrally formed, so that the shapes and materials of the first heat insulation part and the second heat insulation part can be conveniently adjusted, and the suitability of the heat insulation part and the battery monomer is better.

In some embodiments, the first and second insulation portions are integrally formed and connected to one another.

In the scheme of the embodiment of the application, when the first heat insulation part and the second heat insulation part are formed and arranged, the first heat insulation part and the second heat insulation part are connected with each other, so that the problem that a gap exists between the first heat insulation part and the second heat insulation part, and the heat of a battery cell is easy to influence surrounding devices by the gap is solved, and the reliability of the heat insulation part is improved.

In some embodiments, the thermal conductivity of the first thermal shield is greater than the thermal conductivity of the second thermal shield.

In the scheme of the embodiment of the application, the heat conductivity coefficient of the first heat insulation part is larger than that of the second heat insulation part, so that the heat dissipation capacity of the first wall part is enhanced, the risk of the heat accumulation of the first wall part, which leads to the performance reduction of the battery cell, is reduced, and the reliability of the heat insulation part is improved.

In some embodiments, the first insulating portion is disposed elastically deformable in the first direction.

In the scheme of the embodiment of the application, the first heat insulation part is arranged along the first direction in an elastically deformable way, so that the first heat insulation part can be used for absorbing errors in the assembly process of the battery cell, buffering the impact of external force on the battery cell, absorbing the expansion extrusion of the battery cell and improving the reliability of the battery device.

In some embodiments, the first insulation portion and at least a portion of the edge of the first wall portion are spaced apart.

In the scheme of the embodiment of the application, the first heat insulation part and at least part of the edges of the first wall part are arranged at intervals, so that the problem of weld joint cracking caused by additional heat stress concentration generated by the existence of the first heat insulation part in the edge weld joint area of the first wall part is solved, and the reliability of the battery device is improved.

In some embodiments, the dimension of the first insulation in the second direction, H ₁, the dimension of the first wall in the second direction, H ₂, meets H ₂-3mm≤H₁＜H₂, and/or the dimension of the first insulation in the third direction, L ₁, the dimension of the first wall in the third direction, L ₂, meets L ₂-3mm≤L₁＜L₂ mm.

In the solution of the embodiment of the present application, when the dimensions of the first heat insulation portion and the first wall portion meet the above conditions, at least part of the outer edge of the first heat insulation portion is located in the first wall portion, so as to improve the risk that thermal stress is concentrated at the edge portion of the first heat insulation portion, resulting in damage to the first heat insulation portion, and help to improve the reliability of the heat insulation member.

In a second aspect, the present application provides an electrical device, including the battery device of the embodiment of the first aspect.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic view of a vehicle according to an embodiment of the present application;

Fig. 2 is a schematic structural view of a battery device according to an embodiment of the present application;

fig. 3 is a schematic structural view of a battery module according to an embodiment of the present disclosure;

Fig. 4 is an exploded view of a battery cell according to an embodiment of the present application;

Fig. 5 is a schematic structural view of a battery device according to an embodiment of the present application;

fig. 6 is a schematic view showing a part of the structure of a battery device according to an embodiment of the present application;

fig. 7 is a front view of a battery cell of a battery device according to an embodiment of the present application;

fig. 8 is a schematic view showing a part of the structure of a battery device according to another embodiment of the present application;

FIG. 9 is an enlarged schematic view of the structure of FIG. 8A;

Fig. 10 is a schematic view showing a part of the structure of a battery device according to still another embodiment of the present application;

Fig. 11 is a schematic view showing a part of the structure of a battery device according to still another embodiment of the present application.

Reference numerals illustrate:

1. 101, motor, 102, controller;

2. Battery device, 201, battery module, 202, box, 2021, first box, 2022, second box;

3. A battery cell;

4. A housing 41, a side wall 42, an end wall 411, a first wall portion 412, a second wall portion;

5. An electrode assembly;

6. End cap assembly 61, end cap plate 62, electrode terminal 611, protrusion 612, connection part;

7. heat insulator 71, first heat insulator 72, second heat insulator 73, insulator 731, first part 732, second part;

8. a pressure release mechanism;

X, a first direction, Y, a second direction, Z and a third direction.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

It should be noted that unless otherwise indicated, technical or scientific terms used in the embodiments of the present application should be given the ordinary meanings as understood by those skilled in the art to which the embodiments of the present application belong.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the embodiments of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

Furthermore, the technical terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

In describing embodiments of the present application, unless explicitly stated or limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.

In the description of embodiments of the application, unless expressly specified and limited otherwise, a first feature "up" or "down" on a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and the like, and a plurality of fields such as military equipment, aerospace, and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

In the related art, a battery device generally includes a plurality of battery cells disposed in a case, and high temperature generated during operation of the battery cells may affect surrounding devices, resulting in degradation of the battery device.

In the related art, in order to improve the size of the inner space of the battery cell casing, a scheme of partially protruding the end cover assembly can be adopted, and after the scheme is adopted, a part of protrusion appears on the side wall of the casing, and the heat insulation pad in the related art cannot be well adapted to the protrusion, so that heat generated by the battery cell can be transferred to the surrounding environment and devices through the protrusion.

Based on the above-mentioned problems, the embodiment of the application provides a battery device, the battery device includes a case, a battery unit and a heat insulation member, at least two battery units are accommodated in the case and arranged along a first direction, the battery unit includes a housing, the housing includes two side walls disposed opposite to each other along the first direction, the side walls include a first wall portion and a second wall portion, the first wall portion is disposed at least one end of the second wall portion in the second direction, the dimension of the first wall portion in the third direction is smaller than the dimension of the second wall portion in the third direction, the heat insulation member includes a first heat insulation portion, and the problem that the first wall portion of the battery unit and other surrounding devices affect each other in temperature is solved by disposing the first heat insulation portion between the first wall portions of two adjacent battery units, so that the temperature of the battery unit is stabilized, and the performance of the battery device is improved.

The technical scheme described by the embodiment of the application is suitable for a battery device and an electric device using the battery device.

The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc., the spacecraft includes an airplane, a rocket, a space plane, a spacecraft, etc., the electric toy includes a fixed or movable electric toy such as a game machine, an electric vehicle toy, an electric ship toy, an electric plane toy, etc., and the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, an electric planer, etc. The embodiment of the application does not limit the electric device in particular.

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 cell may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited by the embodiment of the application. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application.

The battery device according to the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in the present application may include a battery module, a battery pack, or the like. The battery pack generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and a separator. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive plate comprises a positive current collector and a positive active material layer, wherein the positive active material layer is coated on the surface of the positive current collector, the positive current collector comprises a positive current collecting part and a welding part used for connecting a positive lug, the positive current collecting part is coated with the positive active material layer, and the positive lug is not coated with the positive active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector comprises a negative electrode current collecting part and a welding part used for connecting a negative electrode lug, the negative electrode current collecting part is coated with the negative electrode active material layer, and the negative electrode lug is not coated with the negative electrode active material layer. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described battery devices and electric devices, but may be applied to all battery devices including a case and electric devices using the battery devices, but for simplicity of description, the following embodiments are all described by taking an electric vehicle as an example.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1 according to some embodiments of the application. The vehicle 1 can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extending vehicle. The interior of the vehicle 1 is provided with a battery device 2, and the battery device 2 may be provided at the bottom or at the head or at the tail of the vehicle 1. The battery device 2 may be used for power supply of the vehicle 1, for example, the battery device 2 may serve as an operating power source of the vehicle 1. The vehicle 1 may also include a controller 102 and a motor 101, the controller 102 being configured to control a battery to power the motor 101, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1.

In some embodiments of the application, the battery device 2 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1.

Fig. 2 is a schematic view showing the structure of a battery device according to an embodiment of the present application.

The battery device 2 according to embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 3, and the plurality of battery cells 3 are connected in series, parallel, or series-parallel by a bus bar member.

In some embodiments, the battery cell assembly is generally formed by an arrangement of a plurality of battery cells 3.

As an example, the battery cell assembly may be a battery module 201, and the battery module 201 is formed by arranging and fixing a plurality of battery cells 3 into one independent module. As an example, the battery module 201 may be formed by binding a plurality of battery cells 3 by a tie.

In some embodiments, the battery device may be a battery pack including a housing 202 and one or more battery cell assemblies housed in the housing 202.

As an example, the battery cell assembly may be the battery module 201, and the battery cell assembly may be accommodated in the case in such a manner that the battery module 201 is fixed in the case.

As an example, the battery cell assembly may be accommodated in the case 202 by directly fixing the plurality of battery cells 3 to the case 202.

As an example, the tank 202 may include a first tank 2021 and a second tank 2022. The first housing 2021 and the second housing 2022 are fastened together, so that a closed space is formed inside the housing 202 to accommodate the battery cell assembly. The closing means covering or closing, and can be sealing or unsealing. The first housing 2021 may be an end cap or a bottom plate.

As an example, the tank 202 may include an end cap, a frame, and a bottom plate. The end caps and bottom plate are respectively connected with the frame such that an enclosed space is formed inside the case 202 to receive the battery cell assembly.

In some embodiments, the tank 202 may be part of the chassis structure of the vehicle. For example, portions of the tank 202 may become at least a portion of the floor of the vehicle, or portions of the tank 202 may become at least a portion of the cross members and stringers of the vehicle.

Fig. 3 shows a schematic structure of a battery module 201 according to an embodiment of the present application.

In some embodiments, as shown in fig. 2 and 3, the battery cells 3 are plural, and the plural battery cells 3 are connected in series, parallel or series-parallel to form the battery module 201. The plurality of battery modules 201 are connected in series, in parallel or in series-parallel to form a whole, and are accommodated in the case 202.

The plurality of battery cells 3 in the battery module 201 may be electrically connected through a bus member to realize parallel connection or serial connection or series-parallel connection of the plurality of battery cells 3 in the battery module 201.

Fig. 4 is an exploded view of a battery cell according to an embodiment of the present application. The battery cell 3 refers to the smallest unit constituting the battery. As shown in fig. 4, the battery cell 3 includes an end cap assembly 6, a case 4, and an electrode assembly 5.

The electrode assembly 5 is a component in which electrochemical reactions occur in the battery cells 3. One or more electrode assemblies 5 may be contained within the case 4. The electrode assembly 5 is mainly formed by winding or stacking a pole piece, which is divided into a positive pole piece and a negative pole piece, and a separator is generally provided between the positive pole piece and the negative pole piece. The portions of the positive electrode sheet and the negative electrode sheet having active materials constitute an electrode body, and the portions of the positive electrode sheet and the negative electrode sheet having no active materials constitute tabs, respectively. The positive electrode tab and the negative electrode tab may be located at one end of the electrode body together or at two ends of the electrode body respectively. During charge and discharge of the battery cell 3, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected to the electrode terminal to form a current loop.

The electrode assembly 5 may be a wound structure, a laminated structure, or a hybrid structure of wound and laminated structures.

In some embodiments, the electrode assembly 5 is a coiled structure. The positive plate and the negative plate are wound into a winding structure.

In some embodiments, electrode assembly 5 is a lamination stack. As an example, the positive electrode sheet, the negative electrode sheet may be provided in plurality, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be alternately stacked, the separator may be provided in plurality and provided between any adjacent positive electrode sheets or negative electrode sheets, respectively, or the separator may be provided continuously and provided between any adjacent positive electrode sheets or negative electrode sheets by folding.

In some embodiments, the electrode assembly 5 may have a cylindrical shape, a flat shape, a polygonal column shape, or the like.

In some embodiments, the electrode assembly 5 is provided with tabs that can conduct current away from the electrode assembly. The tab includes a positive tab and a negative tab.

The battery cell 3 may include a case. The case 4 is an assembly for mating with the end cap assembly 6 to form an internal environment of the battery cell 3, wherein the formed internal environment may be used to house the electrode assembly 5, an electrolyte (not shown in the drawings), and other components. The shell 4 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. In some embodiments, the housing 4 may be a sealed structure or a non-sealed structure. As an example, when the case 4 is of a non-sealing structure, the case 4 plays a role of protecting the electrode assembly 5, and a sealing pouch for sealing the electrode assembly and the electrolyte is further included between the case 4 and the electrode assembly 5. In particular, the sealed bag may be a bag-like insulating member or an aluminum plastic film. When the case 4 has a sealed structure, the case is used to encapsulate the electrode assembly 5, the electrolyte, and other components.

As an example, the battery cell 3 may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, and the prismatic battery cell includes a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, etc., and the present application is not particularly limited.

The housing 4 and the end cap assembly 6 may be separate components, and one or more openings may be provided in the housing 4, with the one or more end cap assemblies 6 covering the openings to form the internal environment of the battery cell 3. Alternatively, the end cap assembly 6 and the housing 4 may be integrated. Alternatively, the end cap assembly 6 and the housing 4 may be formed with a common connection surface prior to insertion of the other components into the housing, and the end cap assembly 6 is then allowed to cover the housing 4 when it is desired to encapsulate the interior of the housing 4.

In some embodiments, the electrode terminal 62 may be disposed on the end cap assembly 6 or on the case 4, and the electrode terminal 62 is electrically connected to the tab. The electrode terminal 62 may be directly connected to the tab, or may be indirectly connected to the tab via a switching mechanism.

Referring to fig. 5 and 6, fig. 5 is a schematic structural diagram of a battery device according to an embodiment of the application, and fig. 6 is a schematic structural diagram of a portion of the battery device according to an embodiment of the application.

In a first aspect, as shown in fig. 5 and 6, the present application provides a battery device 2, the battery device 2 includes a case 202, battery cells 3 and a heat insulator 7, at least two battery cells 3 are accommodated in the case 202 and arranged along a first direction X, the battery cells 3 includes a case 4, the case 4 includes two side walls 41 disposed opposite to each other along the first direction X, the side walls 41 include a first wall 411 and a second wall 412, the first wall 411 is disposed at least one end of the second wall 412 in a second direction Y, a dimension of the first wall 411 in a third direction Z is smaller than a dimension of the second wall 412 in the third direction Z, the first direction X, the second direction Y and the third direction Z intersect each other, and the heat insulator 7 includes a first heat insulator 71, the first heat insulator 71 is disposed between the first walls 411 of two adjacent battery cells 3.

In the solution of the embodiment of the present application, the battery device 2 includes a case 202, the battery cells 3 and the heat insulation member 7, at least two battery cells 3 are accommodated in the case 202 and arranged along the first direction X, the battery cells 3 include a housing 4, the housing 4 includes two side walls 41 disposed opposite to each other along the first direction X, the side walls 41 include a first wall 411 and a second wall 412, the first wall 411 is disposed at least one end of the second wall 412 in the second direction Y, the dimension of the first wall 411 in the third direction Z is smaller than the dimension of the second wall 412 in the third direction Z, the heat insulation member 7 includes a first heat insulation portion 71, so as to help stabilize the temperature of the battery cells 3 and improve the performance of the battery device 2 by disposing the first heat insulation portion 71 between the first wall 411 of two adjacent battery cells 3 and other surrounding devices.

Optionally, a plurality of battery cells 3 may be disposed in the case 202, where the plurality of battery cells 3 are distributed in n rows and m columns along the first direction X and the third direction Z, where n is greater than or equal to 2, and m is greater than or equal to 1.

Optionally, the first wall 411 and the second wall 412 are integrally formed, so as to reduce the problem that there is a splice between the two, which affects the sealing performance of the housing 4.

Alternatively, the housing 4 includes two side walls 41 and two end walls 42 connected to each other, the two side walls 41 being disposed opposite each other in the first direction X, the two end walls 42 being disposed opposite each other in the second direction Y, the heat insulating member 7 being disposed only on the side walls 41, or the heat insulating member being disposed on the side walls 41 and the end walls 42.

Alternatively, the side wall 41 comprises a first wall portion 411 and a second wall portion 412, the first wall portion 411 being disposed at either end of the second wall portion 412 in the second direction Y, or the side wall 41 comprises two first wall portions 411 and a second wall portion 412, the two first wall portions 411 being disposed at both ends of the second wall portion 412 in the second direction Y.

Alternatively, the specific dimensions of the first wall 411 and the second wall 412 in the third direction Z may be designed by itself, and the relative positions of the first wall 411 and the second wall 412 in the third direction Z may be exemplified by the first wall 411 being centrally disposed in the second wall 412 in the third direction Z.

The heat insulation member 7 is used for blocking heat conducted to the battery cell 3 from the outside, reducing the risk of overheat runaway of the battery cell 3, blocking heat generated by the battery cell 3, and reducing the influence of the heat of the battery cell 3 on the surrounding environment, adjacent battery cells 3 and other devices. By way of example, the material of the insulating element 7 may be ceramic fibers, silica gel, glass fibers, rubber, aerogel, etc.

By way of example, other devices may be other cells 3, connecting harnesses, boxes, etc., around the cell 3.

Alternatively, the first heat insulating part 71 may be used to block the high temperature of the first wall part 411 from heating other surrounding devices, and the first heat insulating part 71 may improve the problem of the heat of the first wall part 411 from heating other battery cells 3, connecting the wire harness, etc., and the first heat insulating part 71 may also be used to block the high temperature of the surrounding devices to slow down the temperature rise of the first wall part 411, and the first heat insulating part 71 may block the heat of the surrounding other battery cells 3, connecting the wire harness, and the box to slow down the temperature rise of the first wall part 411, for example.

Alternatively, the first heat insulating portion 71 is disposed between the first wall portions 411 of the adjacent two battery cells 3, that is, at least a partial orthographic projection of the first heat insulating portion 71 in the first direction X coincides with the first wall portions 411.

Alternatively, the shape and size of the first heat insulating portion 71 may be designed by itself, and illustratively, the shapes of the first heat insulating portion 71 and the first wall portion 411 are matched with each other, or the first heat insulating portion 71 is rectangular or trapezoidal, or the like.

Alternatively, one first heat insulating portion 71 is disposed between two adjacent first wall portions 411, so as to reduce the cost of the heat insulating member 7, or two first heat insulating portions 71 are respectively disposed on two adjacent first wall portions 411, so as to improve the heat insulating effect of the heat insulating member 7.

Optionally, the first insulating portion 71 is adhered to the first wall portion 411 by a heat conductive gel or an insulating gel, so as to reduce the risk of the first insulating portion 71 falling off.

In some embodiments, as shown in fig. 5 and 6, the first insulating portion 71 is provided elastically deformable in the first direction X.

In these embodiments, the first heat-insulating portion 71 is elastically deformable along the first direction X, so that the first heat-insulating portion 71 can be used to absorb errors in the assembly process of the battery cell 3, buffer the impact of external force on the battery cell 3, and absorb expansion and extrusion of the battery cell 3, so as to improve the reliability of the battery device 2.

For example, the material of the first heat insulation portion 71 may be a specific heat insulation material such as silica gel, rubber, aerogel, and the like, and an elastic material.

Optionally, the heat insulating member 7 is made of an insulating material, or an insulating layer is provided on the outer surface of the heat insulating member 7, and the heat insulating member 7 can be used to improve the insulating performance of the adjacent battery cells 3.

Referring to fig. 7, fig. 7 is a front view of a battery cell of a battery device according to an embodiment of the application.

Alternatively, as shown in fig. 5 to 7, the dimension H ₁ of the first wall portion 411 in the second direction Y of the first heat insulating portion 71, the dimension H ₂ of the first wall portion 411 in the second direction Y satisfies H ₂-5mm≤H₁≤H₂ +5mm, the dimension L ₁ of the first heat insulating portion 71 in the third direction Z, and the dimension L ₂ of the first wall portion 411 in the third direction Z satisfy L ₂-3mm≤L₁≤L₂ +1mm.

In some embodiments, as shown in fig. 5-7, the first insulating portion 71 and at least a portion of the edge of the first wall portion 411 are spaced apart.

In these embodiments, the first heat insulating portion 71 and at least part of the edge of the first wall portion 411 are spaced apart to improve the problem of seam cracking caused by additional thermal stress concentration in the edge seam region of the first wall portion 411 due to the presence of the first heat insulating portion 71, thereby improving the reliability of the battery device 2.

Specifically, the first wall 411 and the second wall 412 are separately disposed, so that the edge of the first wall 411 is welded to the second wall 412 and the end cap assembly 6, respectively, or the first wall 411 and the second wall 412 are integrally disposed, so that the edge of the first wall 411 is welded to the end cap assembly 6. The first heat insulating portion 71 and at least part of the edge of the first wall portion 411 are disposed at intervals, meaning that at least part of the edge of the first wall portion 411 is not covered by the first heat insulating portion 71.

Optionally, the first insulating portion 71 is disposed at intervals along the second direction Y and the edge of the first wall portion 411, and/or the first insulating portion 71 is disposed at intervals along the third direction Z and the edge of the first wall portion 411.

In some embodiments, as shown in fig. 5-7, a dimension H ₁ of the first insulating portion 71 in the second direction Y, a dimension H ₂ of the first wall portion 411 in the second direction Y, satisfies H ₂-3mm≤H₁＜H₂, and/or a dimension L ₁ of the first insulating portion 71 in the third direction Z, a dimension L ₂ of the first wall portion 411 in the third direction Z, satisfies L ₂-3mm≤L₁＜L₂ mm.

In these embodiments, when the first heat insulating portion 71 and the first wall portion 411 are sized to satisfy the above conditions, at least part of the outer edge of the first heat insulating portion 71 is positioned in the first wall portion 411 to improve the risk of thermal stress concentrating at the edge portion of the first heat insulating portion 71, resulting in damage to the first heat insulating portion 71, which contributes to the improvement of the reliability of the heat insulating member 7.

Illustratively, the dimension H ₁ of the first insulating portion 71 in the second direction Y may be H ₂-3mm、H₂-2mm、H₂ -1mm or the like, and the dimension L ₁ of the first insulating portion 71 in the third direction Z may be L ₂-3mm、L₂-2mm、L₂ -1mm or the like.

Referring to fig. 8, fig. 8 is a schematic view illustrating a portion of a battery device according to another embodiment of the application.

In some embodiments, as shown in fig. 5 and 8, the battery cell 3 further includes an end cap assembly 6 and an electrode assembly 5, the case 4 includes an opening at least at one side in the second direction Y, the electrode assembly 5 is received in the case 4, the end cap assembly 6 includes an end cap plate 61 and an electrode terminal 62 connected to each other, the end cap plate 61 covers the opening, the electrode assembly 5 and the electrode terminal 62 are connected, the heat insulator 7 further includes an insulating part 73, the insulating part 73 is disposed at one side of the end cap plate 61 facing away from the electrode assembly 5, and the insulating part 73 is connected with a first heat insulating part 71 at least one end in the first direction X thereof.

In these embodiments, the heat insulating member 7 further includes an insulating portion 73 disposed on a side of the end cover plate 61 facing away from the housing 4, the insulating portion 73 is used to enhance insulation performance of the end cover assembly 6 and surrounding devices, the first heat insulating portion 71 is connected to at least one end of the insulating portion 73 in the first direction X, and by integrating the first heat insulating portion 71 with the insulating portion 73, the first heat insulating portion 71 can be fixed by the insulating portion 73, so that the risk of falling off the first heat insulating portion 71 is reduced, and the processing steps of the battery device 2 are simplified, which is helpful for enhancing productivity of the battery device 2.

The heat insulating member 7 includes an insulating portion 73 and a first heat insulating portion 71 connected to each other, the insulating portion 73 covering at least a part of the surface of the side of the end cover plate 61 facing away from the housing 4 to enhance the insulating performance of the end cover assembly 6, and the first heat insulating portion 71 and the insulating portion 73 are connected and bent to extend to the first wall portion 411.

The insulating portion 73 and the end cover 61 are connected by adhesion, heat fusion, or the like, for example.

Optionally, the insulating part 73 and the first heat insulating part 71 are integrally formed to reduce the processing difficulty of the two, or the insulating part 73 and the first heat insulating part 71 are separately arranged and integrated together to facilitate adjustment of materials of the insulating part 73 and the first heat insulating part 71, and the integrated insulating part 73 and the first heat insulating part 71 are assembled together in the battery cell 3, so that the processing steps of the battery device 2 are simplified.

Optionally, two first heat insulation portions 71 are disposed on two sides of the insulating portion 73 in the first direction X, and each first wall portion 411 is provided with an independent first heat insulation portion 71 to enhance the heat insulation effect of the heat insulation member 7, or each first heat insulation portion 71 is disposed on one side of the insulating portion 73 in the first direction X, and two adjacent first wall portions 411 share one first heat insulation portion 71, so as to reduce the material cost of the heat insulation member 7.

Optionally, the first heat insulating portion 71 may further cover at least part of the second wall portion 412 to enhance the heat insulating effect of the first heat insulating portion 71.

Optionally, the battery unit 3 further includes a pressure release mechanism 8, where the pressure release mechanism 8 is disposed on the end cover assembly 6, and the insulating portion 73 is provided with a through hole to expose the pressure release mechanism 8.

Referring to fig. 9, fig. 9 is an enlarged schematic view of fig. 8 a.

In some embodiments, as shown in fig. 5, 8 and 9, the end cap plate 61 includes a protrusion 611 and two connection parts 612, the two connection parts 612 are disposed at both sides of the protrusion 611 in the second direction Y thereof, the electrode terminal 62 is disposed at the connection part 612, the protrusion 611 is convexly disposed with respect to the connection part 612 in a direction away from the electrode assembly 5, the second wall part 412 is connected with the connection part 612, the first wall part 411 is connected with the protrusion 611, the insulation part 73 includes a first part 731 and a second part 732 connected with each other, the first part 731 is disposed at the protrusion 611, the second part 732 is disposed at the connection part 612, and the first heat insulation part 71 is connected with the first part 731.

In these embodiments, the provision of the protrusion 611 on the end cover plate 61 helps to increase the internal space of the case 4, to increase the capacity of the battery cell 3, and the first portion 731 is provided on the protrusion 611, and the first heat insulating portion 71 and the first portion 731 are connected, which facilitates both the provision of the first heat insulating portion 71 on the first wall 411 and the reduction in the size of the first heat insulating portion 71, and reduces the cost of the heat insulating member 7.

Specifically, the middle region of the end cover plate 61 protrudes with respect to the connection portion 612 in a direction away from the case 4 to form a protruding portion 611, the electrode terminals are separately provided at the two connection portions 612, the insulating portion 73 includes a first portion 731 and a second portion 732, the first portion 731 is disposed at an outer surface of the protruding portion 611, and the second portion 732 is disposed at an outer surface of the connection portion 612.

The protruding portion 611 protrudes away from the housing 4 and is formed with a groove at a side thereof facing the housing 4, the groove including a port in the first direction X, the first wall portion 411 being connected to the protruding portion 611, that is, a part of an edge of the first wall portion 411 being connected to the port edge, and a part of an edge of the second wall portion 412 being connected to the connecting portion 612 at a side of the second direction Y.

Alternatively, the port includes a first edge at one end in the second direction Y and a second edge connected to the first edge and disposed opposite to the first edge in the third direction Z, and the first insulating portion 71 is connected to the first edge. Illustratively, the first insulating portion 71 is connected to the first edge and abuts the second edge such that the first insulating portion 71 is in sufficient contact with the first wall portion 411.

Referring to fig. 10 and 11, fig. 10 is a schematic view of a portion of a battery device according to another embodiment of the application, and fig. 11 is a schematic view of a portion of a battery device according to another embodiment of the application.

In some embodiments, as shown in fig. 5, 10 and 11, the heat insulator 7 further includes a second heat insulating portion 72, at least a portion of the second heat insulating portion 72 being disposed between the second wall portions 412 of the adjacent two battery cells 3.

In these embodiments, by providing the second heat insulating portion 72, the heat insulating member 7 is increased in size to reduce the influence of the heat of the battery cell 3 on surrounding devices, and the performance of the battery device 2 is improved.

Alternatively, the material of the second heat insulation portion 72 may be ceramic fiber, silica gel, glass fiber, rubber, aerogel, or the like.

Alternatively, the shape and size of the second insulating portion 72 may be self-designed, and, illustratively, the shape of the second insulating portion 72 matches the second wall portion 412.

Optionally, the second insulating portion 72 is connected to the second wall portion 412 by an adhesive or a hot-melt manner, so as to improve the stability of the second insulating portion 72.

Alternatively, one second heat insulating portion 72 is disposed between two adjacent second wall portions 412, the second heat insulating portion 72 is connected to the two adjacent second wall portions 412, or two second heat insulating portions 72 are disposed between two adjacent second wall portions 412, and the two second heat insulating portions 72 are connected to the two second wall portions 412, respectively.

Alternatively, the second heat insulating portion 72 may be elastically deformable in the first direction X, so that the second heat insulating portion 72 can cushion an impact force applied to the battery cell 3 in the first direction X and absorb an assembly tolerance of the battery cell 3 in the first direction X.

Optionally, a second insulation portion 72 may be provided on the end wall 42 to lift the insulation 7 area and enhance the insulation capacity of the insulation 7.

In some embodiments, as shown in fig. 5, 10 and 11, the first and second heat insulating portions 71 and 72 are integrally formed, or the first and second heat insulating portions 71 and 72 are separately formed.

In these embodiments, the first and second heat insulating parts 71 and 72 are integrally formed with high material utilization and low processing cost, or the first and second heat insulating parts 71 and 72 are separately formed to facilitate the adjustment of the shapes and materials of the first and second heat insulating parts 71 and 72 so that the suitability of the heat insulating member 7 and the battery cell 3 is better.

Alternatively, the first heat insulating portion 71 and the second heat insulating portion 72 are provided separately, and the materials of the first heat insulating portion 71 and the second heat insulating portion 72 are the same or different.

In some embodiments, as shown in fig. 5 and 11, the first and second heat insulating portions 71 and 72 are separately formed and connected to each other.

In these embodiments, when the first heat insulating portion 71 and the second heat insulating portion 72 are formed separately, they are connected to each other, so that the problem that the heat of the battery cell 3 easily affects surrounding devices through the gap between the first heat insulating portion 71 and the second heat insulating portion 72 is improved, and the reliability of the heat insulating member 7 is improved.

Alternatively, the first heat insulating portion 71 and the second heat insulating portion 72 may be connected by abutting, bonding, or hot melt connection.

In some embodiments, as shown in fig. 5 and 11, the thermal conductivity of the first thermal insulation portion 71 is greater than the thermal conductivity of the second thermal insulation portion 72.

In these embodiments, the thermal conductivity of the first heat insulating portion 71 is greater than that of the second heat insulating portion 72 to enhance the heat radiation capability at the first wall portion 411, reduce the risk of heat accumulation at the first wall portion 411, resulting in degradation of the performance of the battery cell 3, and improve the reliability of the heat insulating member 7.

The temperature of the end of the battery cell 3 near the end cap assembly 6 in the second direction Y is higher, so that the heat conductivity coefficient of the first heat insulation part 71 is larger than that of the second heat insulation part 72, which is helpful to conduct the heat at the first wall part 411 to the air through the first heat insulation part 71, thereby improving the problem of heat accumulation at the first wall part 411 and improving the overall heat insulation capacity.

Alternatively, the first heat insulating portion 71 and the second heat insulating portion 72 are formed separately, and the materials of the first heat insulating portion 71 and the second heat insulating portion 72 are different, and illustratively, the first heat insulating portion 71 includes a phase change material, and absorbs and conducts heat of the first wall portion 411 through the phase change material, or the first heat insulating portion 71 is a composite material, specifically includes two layers of heat insulating materials and a metal heat conducting material sandwiched between the two layers of heat insulating materials, and the heat conducting performance of the first heat insulating portion 71 is improved through the metal heat conducting material, or the first heat insulating portion 71 and the second heat insulating portion 72 are integrally provided, and the first heat insulating portion 71 and the second heat insulating portion 72 are made of the same substrate, and the substrate may be FGM (functional GRADIENT MATERIALS; gradient functional material) so that the heat conducting coefficient of the first heat insulating portion 71 is greater than that of the second heat insulating portion 72.

In some embodiments, as shown in fig. 1 to 11, the battery device 2 includes a case 202, battery cells 3, and a heat insulator 7, at least two battery cells 3 are accommodated in the case 202 and arranged in a first direction X, and the battery cells 3 include a case 4, End cap assembly 6 and electrode assembly 5, case 4 includes two side walls 41 oppositely disposed along first direction X, two side walls 41 are disposed on both sides of case 4 in first direction X, case 4 includes an opening on at least one side in second direction Y, electrode assembly 5 is accommodated in case 4, end cap assembly 6 includes end cap plate 61 and electrode terminal 62 connected with each other, end cap plate 61 covers the opening, electrode assembly 5 and electrode terminal 62 are connected, side wall 41 includes first wall 411 and second wall 412, first wall 411 is disposed on at least one end of second wall 412 in second direction Y, first wall 411 is smaller in size than second wall 412 in third direction Z, end cap plate 61 includes projecting portion 611 and connecting portion 612, two connecting portions 612 are respectively connected to both ends of projecting portion 611 in third direction Z, projecting portion 611 is disposed with respect to connecting portion 612 in a direction away from case 4, second wall 412 is connected with connecting portion 612, first wall 411 is connected with projecting portion 611, and heat insulating member 7 includes first heat insulating portion 71, The second heat insulating part 72 and the insulating part 73, the first heat insulating part 71 is arranged between the first wall parts 411 of two adjacent battery cells 3, the insulating part 73 is arranged on one side of the end cover plate, which faces away from the shell 4, the insulating part 73 comprises a first part 731 and a second part 732 which are mutually connected, the first part 731 is arranged on the protruding part 611, the second part 732 is arranged on the connecting part 612, the first heat insulating part 71 is connected with the first part 731, the second heat insulating part 72 is arranged between the second wall parts 412 of two adjacent battery cells 3, the first heat insulating part 71 and the second heat insulating part 72 are mutually connected, the heat conductivity coefficient of the first heat insulating part 71 is larger than that of the second heat insulating part 72, the first heat insulating part 71 is arranged in a first direction X in a flexible mode, the first heat insulating part 71 is in the size H ₁ of the second direction Y, the size H ₂ of the first wall part 411 in the second direction Y meets H ₂-3mm≤H₁＜H₂, and/or the size L ₁ of the first heat insulating part 71 in the third direction Z meets the size L ₁ of the first wall part in the third direction Z, the first wall part meets the size 3525 mm.

In these embodiments, the battery device 2 includes the case 202, the battery cells 3 and the heat insulating member 7, at least two battery cells 3 are accommodated in the case 202 and arranged along the first direction X, the battery cells 3 include the case 4, the case 4 includes two side walls 41 disposed opposite to each other along the first direction X, the side walls 41 include a first wall 411 and a second wall 412, the first wall 411 is disposed at least one end of the second wall 412 in the second direction Y, the dimension of the first wall 411 in the third direction Z is smaller than the dimension of the second wall 412 in the third direction Z, the heat insulating member 7 includes the first heat insulating portion 71, and by disposing the first heat insulating portion 71 between the first wall 411 of two adjacent battery cells 3, the problem that the first wall 411 of the battery cells 3 and other surrounding devices affect each other in terms of temperature is improved, which helps to stabilize the temperature of the battery cells 3 and improve the performance of the battery device 2.

It should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit the technical solution of the present application, and although the detailed description of the present application is given with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application, and all the modifications or substitutions are included in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery device, comprising:

Box;

A battery cell, at least two of the battery cells are accommodated in the box and arranged along a first direction, the battery cell comprises a shell, the shell comprises two side walls arranged opposite to each other along the first direction, the side walls comprise a first wall portion and a second wall portion, the first wall portion is arranged at least at one end of the second wall portion in the second direction, the dimension of the first wall portion in the third direction is smaller than the dimension of the second wall portion in the third direction, and the first direction, the second direction and the third direction intersect each other;

The heat insulating member comprises a first heat insulating portion, wherein the first heat insulating portion is arranged between the first wall portions of two adjacent battery cells.

2. The battery device according to claim 1, characterized in that the battery cell further comprises an end cap assembly and an electrode assembly, the shell comprises an opening on at least one side of the second direction, the electrode assembly is accommodated in the shell, the end cap assembly comprises an end cap plate and an electrode terminal connected to each other, the end cap plate covers the opening, the electrode assembly and the electrode terminal are connected,

The thermal insulation member further comprises an insulating portion, which is arranged on a side of the end cover plate away from the electrode assembly, and the insulating portion is connected to the first thermal insulation portion at at least one end thereof in the first direction.

3. The battery device according to claim 2 is characterized in that the end cover plate comprises a protruding portion and two connecting portions, the two connecting portions are arranged on both sides of the protruding portion in the second direction thereof, the electrode terminal is arranged on the connecting portion, the protruding portion is protruded relative to the connecting portion in a direction away from the electrode assembly, the second wall portion is connected to the connecting portion, and the first wall portion is connected to the protruding portion.

The insulating portion includes a first portion and a second portion connected to each other, the first portion is disposed on the protruding portion, the second portion is disposed on the connecting portion, and the first heat insulating portion is connected to the first portion.

4 . The battery device according to claim 1 , wherein the heat insulating member further comprises a second heat insulating portion, and at least a portion of the second heat insulating portion is disposed between the second wall portions of two adjacent battery cells.

5 . The battery device according to claim 4 , wherein the first heat insulating portion and the second heat insulating portion are integrally formed or separately formed.

6 . The battery device according to claim 5 , wherein the first heat insulating portion and the second heat insulating portion are separately formed and connected to each other.

7 . The battery device according to claim 4 , wherein a thermal conductivity of the first thermal insulation portion is greater than a thermal conductivity of the second thermal insulation portion.

8. The battery device according to any one of claims 1 to 7, characterized in that the first heat insulating portion is elastically deformable along the first direction.

9 . The battery device according to claim 1 , wherein the first heat insulating portion and at least a portion of the edges of the first wall portion are spaced apart from each other.

10. The battery device according to claim 9, wherein a dimension _H1 of the first heat insulating portion in the second direction and _a dimension _H2 of the first wall portion in the second direction satisfy _H2-3mm≤H1 ＜ _H2 ,

And/or, a dimension L ₁ of the first heat insulating portion in the third direction and a dimension L ₂ of the first wall portion in the third direction satisfy L ₂ -3 mm ≤ L ₁ < L ₂ .

11. An electrical device, characterized in that it comprises the battery device according to any one of claims 1 to 10.