Battery device and power utilization device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a battery monomer and a heat exchange piece, the battery monomer comprises a shell and an electrode assembly, the electrode assembly is arranged in the shell, and the shell comprises a first wall part and a second wall part which are connected with each other; the heat exchange piece is used for exchanging heat with the first wall part, and the heat conductivity coefficient of the first wall part is larger than that of the second wall part. The heat conductivity coefficient of the first wall part exchanging heat with the heat exchange piece is set to be larger than that of the second wall part, so that the heat conductivity of the first wall part is higher than that of the second wall part, and heat generated by the battery monomers can be quickly transferred to the heat exchange piece through the first wall part; according to the battery device, the heat generated by the battery monomers can be quickly taken away by the heat exchange piece, so that the heat exchange effect of the battery device is improved, and the battery device can realize quick temperature adjustment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery device, in particular to a battery device and a power utilization device. BACKGROUND

[0002] The battery device has the advantages of high specific energy and high power density, and is widely used in electronic equipment and vehicles, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships and electric tools.

[0003] When the battery device works, the battery cells inside the battery device generate heat, which increases the temperature of the battery device and the surrounding environment. In order to enable the battery cells to work stably, heat exchange of the battery cells is usually required. How to improve the heat exchange effect of the battery cells in the battery device and keep the temperature of the battery device stable has been concerned by those skilled in the art. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery device and a power utilization device, which has good heat exchange effect and can realize rapid temperature adjustment.

[0005] In the first aspect, the present application provides a battery device, which comprises a battery cell and a heat exchange member. The battery cell comprises a shell and an electrode assembly, and the electrode assembly is arranged in the shell. The shell comprises a first wall part and a second wall part connected to each other. The heat exchange member is used for heat exchange with the first wall part. The thermal conductivity of the first wall part is greater than that of the second wall part.

[0006] In the above structure, by setting the thermal conductivity of the first wall part for heat exchange with the heat exchange member to be greater than that of the second wall part, the heat transfer capacity of the first wall part is stronger than that of the second wall part. The heat generated by the battery cell can be quickly transferred to the heat exchange member, so that the heat generated by the battery cell can be quickly taken away by the heat exchange member. The heat exchange effect of the battery device is improved, and the battery device can realize rapid temperature adjustment.

[0007] According to the battery device provided by some embodiments of the present application, the first wall part comprises a first structure layer and a first thermal conductivity layer. The first structure layer is connected to the second wall part, and the first thermal conductivity layer is arranged on the outer surface of the first structure layer and / or the inner surface of the first structure layer. The thermal conductivity of the first thermal conductivity layer is greater than that of the second wall part and that of the first structure layer. Therefore, the heat of the first wall part can be quickly transferred to the heat exchange member, and the heat transfer capacity of the first wall part is improved.

[0008] According to the battery device provided by some embodiments of the present application, the thickness of the first heat-conducting layer is H1, the thickness of the first structural layer is H2, and H1 / H2≤10%, so that the first heat-conducting layer is not too thick to affect the heat-conducting capacity of the first wall part.

[0009] According to the battery device provided by some embodiments of the present application, the first heat-conducting layer is in a hexagonal boron nitride structure, a diamond-like structure or a silicon carbide structure. Since the hexagonal boron nitride material, the diamond-like material or the silicon carbide material has a high heat-conducting coefficient, the first heat-conducting layer is made of the hexagonal boron nitride material, the diamond-like material or the silicon carbide material, so that the first heat-conducting layer has a high heat-conducting coefficient to improve the heat-conducting capacity of the first wall part.

[0010] According to the battery device provided by some embodiments of the present application, the outer surface of the first structural layer and the inner surface of the first structural layer are both provided with the first heat-conducting layer, and the thickness of the first heat-conducting layer on the inner surface of the first structural layer is greater than the thickness of the first heat-conducting layer on the outer surface of the first structural layer. By providing the first heat-conducting layer on the outer surface of the first structural layer and the inner surface of the first structural layer, and setting the thickness of the first heat-conducting layer on the inner surface of the first structural layer to be greater than the thickness of the first heat-conducting layer on the outer surface of the first structural layer, the heat inside the battery cell can be quickly transferred to the first wall part, which is conducive to improving the ability of the first wall part to diffuse the heat inside the battery cell outward.

[0011] According to the battery device provided by some embodiments of the present application, the second wall part includes a second structural layer and a second heat-conducting layer, the second structural layer is connected to the first structural layer, the second heat-conducting layer is arranged on the second structural layer and connected to the first heat-conducting layer, the heat-conducting coefficient of the second heat-conducting layer is greater than that of the second structural layer, and the heat-conducting coefficient of the first heat-conducting layer is greater than that of the second heat-conducting layer, so that the first heat-conducting layer can make the first wall part have a stronger heat-conducting capacity than the second wall part, and the heat generated by the battery cell can be quickly transferred to the heat exchange element through the first wall part.

[0012] According to the battery device provided by some embodiments of the present application, the thickness of the first wall part is less than that of the second wall part. By setting the thickness of the first wall part to be less than that of the second wall part, the first wall part has a stronger heat-conducting capacity, so that the heat generated by the battery cell can be better transferred to the heat exchange element after being transferred to the first wall part, which is conducive to improving the heat dissipation capacity of the battery cell.

[0013] According to the battery device provided by some embodiments of the present application, the first wall part is a high polymer material structure containing hexagonal boron nitride, diamond-like or silicon carbide. By making the high polymer material structure contain hexagonal boron nitride, diamond-like or silicon carbide, the first wall part has a high heat-conducting coefficient to improve the heat-conducting capacity of the first wall part.

[0014] According to the battery device provided by some embodiments of the present application, the shell comprises a shell body and a cover body, the shell body forms a cavity with an opening, the electrode assembly is arranged in the cavity, and the cover body covers the opening. The first wall part is arranged in the shell body. By arranging the first wall part as at least part of the wall structure in the shell body, the heat exchange element is less likely to exchange heat with the cover body, thereby reducing the possibility that the heat exchange element affects the electrode terminals, the liquid injection hole and other functional structures arranged on the cover body.

[0015] According to the battery device provided by some embodiments of the present application, the shell comprises a third wall body, two first wall bodies arranged opposite to each other along a first direction, and two second wall bodies arranged opposite to each other along a second direction. The second wall bodies are connected between the two first wall bodies. The first wall bodies and the second wall bodies form a cavity with an opening at an end in a third direction on the third wall body. The first direction, the second direction and the third direction are perpendicular to each other, so that the battery monomer is a square shell battery monomer. This not only makes the internal components of the battery monomer easy to arrange, but also makes the heat exchange element easy to contact and fit with the wall body of the battery monomer, so that the heat exchange between the heat exchange element and the battery monomer is facilitated.

[0016] According to the battery device provided by some embodiments of the present application, the area of the first wall body is greater than the area of the second wall body, and the area of the first wall body is greater than the area of the third wall body. At least one first wall body is configured as a first wall part, so that the wall structure with the largest area in the shell body exchanges heat with the heat exchange element. This is conducive to increasing the heat exchange area of the shell and the heat exchange element, increasing the heat exchange amount between the battery monomer and the heat exchange element, and making the heat exchange element and the battery monomer have good heat exchange effect.

[0017] According to the battery device provided by some embodiments of the present application, the third wall body is configured as a first wall part, so that the heat exchange element can exchange heat with the shell from the outside opposite to the cover body. The heat exchange element can be arranged on the side of the battery monomer away from the cover body, so that the arrangement of the heat exchange element in the battery device is facilitated.

[0018] According to the battery device provided by some embodiments of the present application, the area of the first wall body is greater than the area of the second wall body. At least one second wall body is configured as a first wall part, so that the heat exchange element can exchange heat with the shell from the outside of the side wall arranged in the second direction. The heat exchange element can be clamped between two adjacent battery monomers along the second direction, which is convenient for the arrangement of the heat exchange element.

[0019] According to the battery device provided by some embodiments of the present application, two of the first wall body, the second wall body and the third wall body are configured as first wall parts, so that the shell can transfer heat to the heat exchange element from two directions, thereby improving the ability of the battery monomer to dissipate heat to the outside through the shell.

[0020] In a third aspect, the present application provides a power consuming device, which comprises the battery device provided in any of the technical solutions above, and the battery device is used to provide electric energy.

[0021] The technical solutions provided by the embodiments of the present application bring at least the following beneficial effects:

[0022] The present application provides a battery device, which comprises a battery monomer and a heat exchange element, the battery monomer comprises a shell and an electrode assembly, the electrode assembly is arranged in the shell, the shell comprises a first wall part and a second wall part connected with each other; the heat exchange element is used to exchange heat with the first wall part, and the thermal conductivity of the first wall part is greater than that of the second wall part. By setting the thermal conductivity of the first wall part that exchanges heat with the heat exchange element to be greater than that of the second wall part, the heat conduction capacity of the first wall part is stronger than that of the second wall part, the heat generated by the battery monomer can be quickly transferred to the heat exchange element through the first wall part, so that the heat generated by the battery monomer can be quickly taken away by the heat exchange element, the heat exchange effect of the battery device is improved, and the battery device can realize rapid temperature adjustment.

[0023] The above description is only a summary of the technical solutions of the present application, in order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to depict only preferred embodiments of the application, and therefore should not be considered to limit the scope of the application in any way. Furthermore, the drawings are merely intended to show one possible implementation of the application and are not therefore to be considered to be limiting of its scope.

[0025] Figure 1 Structure diagram of a vehicle provided by some embodiments of the present application;

[0026] Figure 2 Split diagram of a battery device provided by some embodiments of the present application;

[0027] Figure 3 Split diagram of a battery monomer provided by some embodiments of the present application;

[0028] Figure 4 Structure diagram of a battery monomer provided by some embodiments of the present application;

[0029] Figure 5 Sectional view of a first wall part in a battery monomer provided by some embodiments of the present application;

[0030] Figure 6A cross-sectional view of a first wall portion in a battery cell according to some embodiments of the present application;

[0031] Figure 7 A cross-sectional view of a partial housing in a battery cell according to some embodiments of the present application;

[0032] Figure 8 A cross-sectional view of a partial housing in a battery cell according to some embodiments of the present application;

[0033] Figure 9 A structural schematic view of a housing in a battery cell according to some embodiments of the present application.

[0034] In the drawings:

[0035] 1, vehicle; 2, battery device; 3, controller; 4, motor; 5, box; 5a, first box portion; 5b, second box portion; 5c, accommodation space; 6, heat exchange member; 7, battery cell; 72, outer shell; 720, cavity; 721, first wall portion; 7211, first structure layer; 7212, first heat conduction layer; 722, second wall portion; 7221, second structure layer; 7222, second heat conduction layer; 723, housing; 7231, first wall body; 7232, second wall body; 7233, third wall body; 7234, opening; 724, cover body; 725, electrode assembly; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0036] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0038] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0039] In addition, the technical terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more (including two), unless otherwise explicitly specified and limited.

[0040] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0041] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0042] At present, from the development of market situation, the application of battery device is more and more widely. The battery device is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields.

[0043] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cell assemblies to provide higher voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel or mixed connection through busbar components.

[0044] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0045] The battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging the battery cell.

[0046] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead-acid battery cell, etc.

[0047] The battery cell generally includes an electrode assembly and a case. The electrode assembly located in the case includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time, can allow the active ions to pass through.

[0048] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0049] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shapes of battery cells, the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery, such as a hexagonal prismatic battery, etc.

[0050] In some embodiments, the battery device can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0051] In some embodiments, the battery device can be a battery pack, and the battery pack includes a box body and a battery cell, and the battery cell or the battery module is contained in the box body.

[0052] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0053] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0054] The battery cell usually generates heat during operation, which causes the temperature of the battery cell itself and the surrounding environment to rise. Heat management components such as heat exchange components are usually arranged in the battery device to exchange heat with the battery cell to control the temperature. Generally, the heat generated by the battery cell is transferred to the nearby heat exchange component through the case, so that the heat exchange medium circulating in the heat exchange component carries away the heat generated by the battery cell. In the prior art, the heat exchange component usually exchanges heat with part of the wall in the case, and the other part of the wall cannot directly exchange heat with the heat exchange component, which is not conducive to improving the heat exchange effect of the battery device.

[0055] To improve the heat exchange effect of a battery device, this application provides a battery device including a battery cell and a heat exchanger. The battery cell includes a housing and an electrode assembly, with the electrode assembly disposed within the housing. The housing includes a first wall and a second wall connected to each other. The heat exchanger exchanges heat with the first wall, and the thermal conductivity of the first wall is greater than that of the second wall. By setting the thermal conductivity of the first wall, which exchanges heat with the heat exchanger, to be greater than that of the second wall, the heat conduction capacity of the first wall is stronger than that of the second wall. This allows the heat generated by the battery cell to be quickly transferred to the heat exchanger through the first wall, enabling the heat generated by the battery cell to be rapidly carried away by the heat exchanger. This improves the heat exchange effect of the battery device and allows for rapid temperature regulation.

[0056] The battery device described in the embodiments of this application is applicable to electrical devices that use battery devices.

[0057] Electrical devices can include vehicles, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0058] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0059] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0060] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0061] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0062] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0063] Figure 2 A split view of a battery device is provided for some embodiments of the present application. As shown in Figure 2 , the battery device 2 includes a box 5, a heat exchange member 6, and a battery cell assembly, the heat exchange member 6 and the battery cell assembly being housed in the box 5. The battery cell assembly includes a plurality of battery cells 7, the battery cell 7 being the smallest unit constituting a battery and exchanging heat with the heat exchange member 6.

[0064] The box 5 is used to house the battery cell 7, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box part 5a and a second box part 5b, the first box part 5a and the second box part 5b being mutually coverable, the first box part 5a and the second box part 5b together defining a housing space 5c for housing the battery cell assembly. The second box part 5b can be a hollow structure with one end open, and the first box part 5a can be a plate-like structure, the first box part 5a being coverable on the open side of the second box part 5b to form the box 5 with the housing space 5c; or both the first box part 5a and the second box part 5b can be hollow structures with one side open, the open side of the first box part 5a being coverable on the open side of the second box part 5b to form the box 5 with the housing space 5c. Of course, the first box part 5a and the second box part 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0065] To improve the sealing performance of the first box part 5a and the second box part 5b after being connected, a sealing member, such as a sealing glue, a sealing ring, etc., can be arranged between the first box part 5a and the second box part 5b.

[0066] Supposing that the first box part 5a is coverable on the top of the second box part 5b, the first box part 5a can also be referred to as an upper box cover, and the second box part 5b can also be referred to as a lower box.

[0067] A plurality of battery cell assemblies can be arranged in the battery device. The plurality of battery cells 7 in the battery cell assembly can be connected in series, in parallel, or in a mixed manner, the mixed manner referring to that the plurality of battery cells 7 are connected in series and in parallel.

[0068] The technical solutions of the battery device and the power utilization device provided by the specific embodiments of the present application will be further described below.

[0069] Some embodiments of the present application provide a battery device 2, which includes a battery cell 7 and a heat exchange member 6, as shown in Figure 3 , the battery cell 7 includes a shell 72 and an electrode assembly 725, the electrode assembly 725 being arranged in the shell 72, as shown in Figure 4The shell 72 comprises a first wall portion 721 and a second wall portion 722 connected to each other; the heat exchange member 6 is configured to exchange heat with the first wall portion 721, and the first wall portion 721 has a thermal conductivity greater than that of the second wall portion 722.

[0070] The battery cell 7 can be the smallest unit capable of charging and discharging in the battery device 2. The electrode assembly 725 is a component in the battery cell 7 where electrochemical reactions occur. One or more electrode assemblies 725 can be contained in the shell 72. The electrode assembly 725 can include an electrode body and a tab extending from one side of the electrode body, and the tab is configured to connect with an electrode terminal on the cover shell 72, so that the electrode assembly 725 can be electrically connected to external electrical devices or charging devices through the electrode terminal.

[0071] The electrode assembly 725 can include a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet and the negative electrode sheet can serve as a positive electrode and a negative electrode, respectively. During charging and discharging of the battery cell 7, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode, and heat is generated in the electrode assembly 725 during this process. The separator is arranged between the positive electrode sheet and the negative electrode sheet, and is configured to separate the positive electrode sheet and the negative electrode sheet, while allowing the active ions to pass through, thereby preventing short circuiting of the positive and negative electrodes.

[0072] The shell 72 can be a component of the battery cell 7 for enclosing a sealed space, and is configured to accommodate the electrode assembly 725 and other components in the battery cell 7.

[0073] The first wall portion 721 and the second wall portion 722 are two different parts of the shell 72, and are connected to each other to form the shell 72, which can enclose a sealed cavity 720 for accommodating the electrode assembly 725. The thermal conductivity of the first wall portion 721 is greater than that of the second wall portion 722, so that the first wall portion 721 has a stronger heat conduction capacity than other parts of the shell 72, and the first wall portion 721 can quickly transfer heat from the inside of the battery cell 7 to the outside.

[0074] The heat exchange member 6 can be a component of the battery device 2 for contacting the battery cell 7 to exchange heat. The heat exchange member 6 is provided with a heat exchange flow channel, and a heat exchange medium can circulate through the heat exchange flow channel into the heat exchange member 6, so that the heat exchange member 6 can maintain a temperature difference with the battery cell 7, and the heat exchange member 6 can continuously and efficiently exchange heat with the battery cell 7. For example, the heat exchange member 6 can include a heat exchange plate or a heat exchange sheet provided with a heat exchange flow channel, and a person skilled in the art can set the type of the heat exchange member 6 according to the actual situation, so that the heat exchange member 6 can be in good contact with the battery cell 7 for efficient heat exchange.

[0075] The heat exchange member 6 is used for heat exchange with the first wall portion 721, which can mean that the heat exchange member 6 exchanges heat with the first wall portion 721 to make the heat exchange member 6 exchange heat with the battery monomer 7. Exemplarily, the heat exchange member 6 can be attached to the outer surface of the first wall portion 721, so that the heat generated by the battery monomer 7 can be directly transferred to the heat exchange member 6; the heat exchange member 6 can also be attached to the outer surface of the first wall portion 721 by a heat-conducting adhesive, so that the heat exchange member 6 can be connected as a whole structure with the battery monomer 7, which is conducive to improving the overall structural strength of the battery device 2.

[0076] Since the first wall portion 721 has a stronger heat conduction capacity than other parts in the shell 72, the heat generated by the battery monomer 7 can be quickly diffused outward through the first wall portion 721. The heat generated by the battery monomer 7 is quickly transferred to the heat exchange member 6 through the first wall portion 721, so that the heat generated by the battery monomer 7 can be quickly taken away by the heat exchange member 6.

[0077] In the above structure, by setting the thermal conductivity coefficient of the first wall portion 721 that exchanges heat with the heat exchange member 6 to be greater than the thermal conductivity coefficient of the second wall portion 722, the heat conduction capacity of the first wall portion 721 is stronger than that of the second wall portion 722, the heat generated by the battery monomer 7 can be quickly transferred to the heat exchange member 6 through the first wall portion 721, so that the heat generated by the battery monomer 7 can be quickly taken away by the heat exchange member 6, which improves the heat exchange effect of the battery device 2, so that the battery device 2 can realize rapid temperature adjustment.

[0078] In some embodiments, referring to Figure 5 and Figure 6 , the first wall portion 721 includes a first structure layer 7211 and a first heat conduction layer 7212, the first structure layer 7211 is connected to the second wall portion 722, the first heat conduction layer 7212 is arranged on the outer surface of the first structure layer 7211 and / or the inner surface of the first structure layer 7211, and the thermal conductivity coefficient of the first heat conduction layer 7212 is greater than the thermal conductivity coefficient of the second wall portion 722 and the thermal conductivity coefficient of the first structure layer 7211.

[0079] The first structure layer 7211 can be a base structure in the first wall portion 721, which is connected to the second wall portion 722 as a main part of the first wall portion 721, so that the first wall portion 721 and the second wall portion 722 form the shell 72 to enclose the cavity 720 accommodating the electrode assembly 725.

[0080] The first heat conduction layer 7212 can be a structural layer of the first wall portion 721 for improving the heat conduction coefficient of the first wall portion 721. The first heat conduction layer 7212 is arranged on the outer surface of the first structural layer 7211 and / or the inner surface of the first structural layer 7211. This means that the first heat conduction layer 7212 can be arranged on the outer surface of the first structural layer 7211, or the first heat conduction layer 7212 can be arranged on the inner surface of the first structural layer 7211, or the first heat conduction layer 7212 can be arranged on both the outer surface of the first structural layer 7211 and the inner surface of the first structural layer 7211.

[0081] With reference to the above description, Figure 5 By arranging the first heat conduction layer 7212 on the outer surface of the first structural layer 7211 and making the heat conduction coefficient of the first heat conduction layer 7212 greater than the heat conduction coefficient of the second wall portion 722 and the heat conduction coefficient of the first structural layer 7211, the first heat conduction layer 7212 can exchange heat with the heat exchange member 6, so that the heat of the first wall portion 721 can be quickly transferred to the heat exchange member 6, thereby improving the heat conduction capacity of the first wall portion 721.

[0082] By arranging the first heat conduction layer 7212 on the inner surface of the first structural layer 7211 and making the heat conduction coefficient of the first heat conduction layer 7212 greater than the heat conduction coefficient of the second wall portion 722 and the heat conduction coefficient of the first structural layer 7211, the heat inside the battery monomer 7 can be quickly transferred to the first wall portion 721, thereby improving the heat conduction capacity of the first wall portion 721.

[0083] With reference to the above description, Figure 6 By arranging the first heat conduction layer 7212 on both the outer surface of the first structural layer 7211 and the inner surface of the first structural layer 7211 and making the heat conduction coefficient of the first heat conduction layer 7212 greater than the heat conduction coefficient of the second wall portion 722 and the heat conduction coefficient of the first structural layer 7211, the first heat conduction layer 7212 can exchange heat with the heat exchange member 6, so that the heat inside the battery monomer 7 can be quickly transferred to the first wall portion 721, and the heat of the first wall portion 721 can be quickly transferred to the heat exchange member 6, thereby improving the heat conduction capacity of the first wall portion 721.

[0084] Exemplarily, the sum of the thickness of the first structural layer 7211 and the thickness of the first heat conduction layer 7212 is equal to the thickness of the second wall portion 722, and the thermal conductivity coefficient of the first structural layer 7211 is equal to the thermal conductivity coefficient of the first wall portion 721. That is, by replacing part of the first wall portion 721 with the first heat conduction layer 7212 having a larger thermal conductivity coefficient, the first wall portion 721 and the second wall portion 722 in the shell 72 are arranged to have the same thickness, which is conducive to making the structures of different parts of the shell 72 similar, and at the same time, the thermal conductivity coefficient of the first wall portion 721 can be improved. In some embodiments, the first structural layer 7211 and the first wall portion 721 are both made of aluminum structures, and the shell 72 has good heat dissipation capacity and structural strength.

[0085] The first structural layer 7211 is connected to the second wall portion 722. The first structural layer 7211 can be connected to the surface of the second wall portion 722 by adhesion or other means, or the first structural layer 7211 can be connected to the second wall portion 722 by a connecting member such as a rivet, or the first structural layer 7211 can be connected to the surface of the second wall portion 722 by coating.

[0086] In some embodiments, the thickness of the first heat conduction layer 7212 is H1, and the thickness of the first structural layer 7211 is H2, and H1 / H2≤10%.

[0087] By setting the relationship between the thickness H1 of the first heat conduction layer 7212 and the thickness H2 of the first structural layer 7211 as H1 / H2≤10%, the first heat conduction layer 7212 is not prone to being too thick to affect the heat dissipation capacity of the first wall portion 721 due to the thickness of the first wall portion 721 being too thick.

[0088] In some embodiments, the first heat conduction layer 7212 is a hexagonal boron nitride structure, a diamond-like structure, or a silicon carbide structure.

[0089] The first heat conduction layer 7212 is a hexagonal boron nitride structure, a diamond-like structure, or a silicon carbide structure, which means that the first heat conduction layer 7212 is made of hexagonal boron nitride material, diamond-like material, or silicon carbide material. Since hexagonal boron nitride material, diamond-like material, or silicon carbide material has a high thermal conductivity coefficient, by making the first heat conduction layer 7212 from hexagonal boron nitride material, diamond-like material, or silicon carbide material, the first heat conduction layer 7212 can have a high thermal conductivity coefficient to improve the heat dissipation capacity of the first wall portion 721.

[0090] Exemplarily, the first heat conduction layer 7212 can be formed by coating hexagonal boron nitride slurry, diamond-like slurry, or silicon carbide slurry on the surface of the first structural layer 7211 and drying.

[0091] In some embodiments, the outer surface of the first structural layer 7211 and the inner surface of the first structural layer 7211 are both provided with the first heat-conducting layer 7212, and the thickness of the first heat-conducting layer 7212 on the inner surface of the first structural layer 7211 is greater than the thickness of the first heat-conducting layer 7212 on the outer surface of the first structural layer 7211.

[0092] By providing the first heat-conducting layer 7212 on the outer surface of the first structural layer 7211 and the inner surface of the first structural layer 7211, and setting the thickness of the first heat-conducting layer 7212 on the inner surface of the first structural layer 7211 to be greater than the thickness of the first heat-conducting layer 7212 on the outer surface of the first structural layer 7211, the heat inside the battery monomer 7 can be transmitted to the first wall part 721 more quickly, which is conducive to improving the ability of the first wall part 721 to diffuse the heat inside the battery monomer 7 outward.

[0093] In some embodiments, referring to Figure 7 and Figure 8 , the second wall part 722 includes a second structural layer 7221 and a second heat-conducting layer 7222, the second structural layer 7221 is connected to the first structural layer 7211, the second heat-conducting layer 7222 is arranged on the second structural layer 7221 and connected to the first heat-conducting layer 7212, the thermal conductivity of the second heat-conducting layer 7222 is greater than the thermal conductivity of the second structural layer 7221, and the thermal conductivity of the first heat-conducting layer 7212 is greater than the thermal conductivity of the second heat-conducting layer 7222.

[0094] The second structural layer 7221 can be a base structure in the second wall part 722, which is connected to the first structural layer 7211 as the main part of the second wall part 722, so that the first wall part 721 and the second wall part 722 form the shell 72 to enclose the cavity 720 for accommodating the electrode assembly 725.

[0095] The second heat-conducting layer 7222 can be a structural layer in the second wall part 722 for improving the thermal conductivity of the second wall part 722. The second heat-conducting layer 7222 is arranged on the second structural layer 7221 and connected to the first heat-conducting layer 7212, which means that the second heat-conducting layer 7222 and the first heat-conducting layer 7212 are arranged on the same side (the inner side or the outer side of the shell 72) of the shell 72 and connected to each other. Since the thermal conductivity of the second heat-conducting layer 7222 is greater than the thermal conductivity of the second structural layer 7221 and the thermal conductivity of the first heat-conducting layer 7212 is greater than the thermal conductivity of the first structural layer 7211, the second heat-conducting layer 7222 and the first heat-conducting layer 7212 can improve the overall heat-conducting capacity of the shell 72, which is conducive to improving the overall heat-dissipating capacity of the battery monomer 7.

[0096] By setting the thermal conductivity of the first thermal conductive layer 7212 to be greater than the thermal conductivity of the second thermal conductive layer 7222, the first thermal conductive layer 7212 can make the first wall portion 721 have a stronger thermal conductive capacity than the second wall portion 722, so that the heat generated by the battery cell 7 can be quickly transferred to the heat exchange member 6 through the first wall portion 721.

[0097] In some embodiments, the thickness of the first wall portion 721 is less than the thickness of the second wall portion 722.

[0098] By setting the thickness of the first wall portion 721 to be less than the thickness of the second wall portion 722, the first wall portion 721 has a stronger heat transfer capacity, so that the heat generated by the battery cell 7 can be better transferred to the heat exchange member 6 after being transferred to the first wall portion 721, which is conducive to improving the heat dissipation capacity of the battery cell 7.

[0099] In some embodiments, the first wall portion 721 is a high polymer material structure containing hexagonal boron nitride, diamond-like or silicon carbide.

[0100] The high polymer material structure can be a structure made of high polymer material. Since the hexagonal boron nitride material, diamond-like material or silicon carbide material has a high thermal conductivity, by making the high polymer material structure contain hexagonal boron nitride, diamond-like or silicon carbide, the first wall portion 721 can have a high thermal conductivity to improve the heat conductive capacity of the first wall portion 721.

[0101] For example, the first wall portion 721 can be a plastic (such as polypropylene) structure containing hexagonal boron nitride, diamond-like or silicon carbide.

[0102] In some embodiments, continuing to refer to Figure 3 , the shell 72 includes a shell body 723 and a cover body 724, the shell body 723 forms a cavity 720 with an opening 7234, the electrode assembly 725 is arranged in the cavity 720, the cover body 724 is covered on the opening 7234, and the first wall portion 721 is arranged in the shell body 723.

[0103] The shell body 723 and the cover body 724 are two parts connected with each other in the shell 72, wherein the shell body 723 surrounds the cavity 720 with the opening 7234, not only enabling the components such as the electrode assembly 725 to be arranged in the cavity 720, but also enabling the components such as the electrode assembly 725 to be conveniently loaded into the cavity 720 from the opening 7234; the cover body 724 can be a part for sealing and plugging the opening 7234, which is sealingly covered on the shell body 723 to form a sealed space in the cavity 720.

[0104] Among them, the cover body 724 can be provided with functional structures such as electrode terminals and liquid injection holes.

[0105] The first wall portion 721 is arranged in the shell 723, and can be arranged as at least part of a wall structure in the shell 723. By arranging the first wall portion 721 as at least part of a wall structure in the shell 723, the heat exchange member 6 is less likely to exchange heat with the cover 724, reducing the possibility of the heat exchange member 6 affecting the electrode terminals, liquid injection holes and other functional structures arranged on the cover 724.

[0106] In some embodiments, with reference to Figure 9 The shell 723 includes a third wall 7233, two first walls 7231 arranged opposite to each other along a first direction X, and two second walls 7232 arranged opposite to each other along a second direction Y, the second walls 7232 being connected between the two first walls 7231, the first walls 7231 and the second walls 7232 forming a cavity 720 with an opening 7234 at an end in a third direction Z around the third wall 7233, the first direction X, the second direction Y and the third direction Z being perpendicular to each other.

[0107] The first walls 7231, the second walls 7232 and the third wall 7233 are different wall structures connected to each other in the shell 723. Among them, two first walls 7231 are arranged opposite to each other along the first direction X, and two second walls 7232 are arranged opposite to each other along the second direction Y.

[0108] The two second walls 7232 are connected between the two first walls 7231, and the first walls 7231 and the second walls 7232 are arranged around the third wall 7233, so that the shell 723 forms the cavity 720 with the opening 7234 at the end in the third direction Z, the third wall 7233 and the opening 7234 being arranged opposite to each other in the third direction Z.

[0109] The first direction X, the second direction Y and the third direction Z are perpendicular to each other, so that the battery cell 7 is a square battery cell 7, which not only facilitates the arrangement of the internal components of the battery cell 7, but also facilitates the contact of the heat exchange member 6 with the wall of the battery cell 7, so that the heat exchange between the heat exchange member 6 and the battery cell 7 is facilitated.

[0110] In some embodiments, the area of the first wall 7231 is greater than the area of the second wall 7232, the area of the first wall 7231 is greater than the area of the third wall 7233, and at least one first wall 7231 is configured as the first wall portion 721.

[0111] By setting the area of the first wall 7231 to be greater than the area of the second wall 7232 and setting the area of the first wall 7231 to be greater than the area of the third wall 7233, the first wall 7231 is the largest wall structure in the shell 723.

[0112] The at least one first wall body 7231 is configured as the first wall portion 721. This can mean that one of the two first wall bodies 7231 is configured as the first wall portion 721, and the one of the two first wall bodies 7231 exchanges heat with the heat exchange member 6. This can also mean that both of the two first wall bodies 7231 are configured as the first wall portion 721, and both of the two first wall bodies 7231 exchange heat with the heat exchange member 6.

[0113] By configuring the at least one first wall body 7231 as the first wall portion 721, the wall body structure with the largest area in the shell 723 exchanges heat with the heat exchange member 6, which is beneficial to increase the heat exchange area of the shell 723 and the heat exchange member 6, increase the heat exchange amount between the battery monomer 7 and the heat exchange member 6, and make the heat exchange member 6 and the battery monomer 7 have a good heat exchange effect.

[0114] In some embodiments, the third wall body 7233 is configured as the first wall portion 721.

[0115] Since the third wall body 7233 is arranged opposite to the opening 7234, by configuring the third wall body 7233 as the first wall portion 721, the heat exchange member 6 can exchange heat with the shell 723 from the outside opposite to the cover body 724, the heat exchange member 6 can be arranged on the side of the battery monomer 7 away from the cover body 724, and the arrangement of the heat exchange member 6 in the battery device 2 is convenient.

[0116] In some embodiments, the area of the first wall body 7231 is greater than the area of the second wall body 7232, and the at least one second wall body 7232 is configured as the first wall portion 721.

[0117] The area of the first wall body 7231 is greater than the area of the second wall body 7232, which can mean that the second wall body 7232 is a wall body structure with a smaller area in the peripheral wall of the shell 723. The at least one second wall body 7232 is configured as the first wall portion 721, which can mean that one of the two second wall bodies 7232 is configured as the first wall portion 721, and the one of the two second wall bodies 7232 exchanges heat with the heat exchange member 6. This can also mean that both of the two second wall bodies 7232 are configured as the first wall portion 721, and both of the two second wall bodies 7232 exchange heat with the heat exchange member 6.

[0118] By configuring the at least one second wall body 7232 as the first wall portion 721, the heat exchange member 6 can exchange heat with the shell 723 from the outside of the side wall arranged in the second direction Y, and the heat exchange member 6 can be clamped between two adjacent battery monomers 7 along the second direction Y, which is beneficial to the arrangement of the heat exchange member 6.

[0119] In some embodiments, two of the first wall body 7231, the second wall body 7232, and the third wall body 7233 are configured as the first wall portion 721.

[0120] Two of the first wall body 7231, the second wall body 7232 and the third wall body 7233 are configured as the first wall part 721. The third wall body 7233 and one of the first wall body 7231 can be the first wall part 721 to exchange heat with the heat exchange member 6, so that the shell 723 can transfer heat to the heat exchange member 6 from the first direction X and the third direction Z, thereby improving the ability of the battery monomer 7 to dissipate heat to the outside through the shell 723. The third wall body 7233 and one of the second wall body 7232 can be the first wall part 721 to exchange heat with the heat exchange member 6, so that the shell 723 can transfer heat to the heat exchange member 6 from the second direction Y and the third direction Z, thereby improving the ability of the battery monomer 7 to dissipate heat to the outside through the shell 723. One of the first wall body 7231 and one of the second wall body 7232 can be the first wall part 721 to exchange heat with the heat exchange member 6, so that the shell 723 can transfer heat to the heat exchange member 6 from the second direction Y and the first direction X, thereby improving the ability of the battery monomer 7 to dissipate heat to the outside through the shell 723.

[0121] Some embodiments of the present application also provide an electric device, which comprises the battery device 2 provided by the foregoing technical solutions, and the battery device 2 is used to provide electric energy.

[0122] Some embodiments of the present application provide a battery device 2, the battery device 2 comprises a battery cell 7 and a heat exchange element 6, the battery cell 7 comprises a shell 72 and an electrode assembly 725, the electrode assembly 725 is arranged in the shell 72, the shell 72 divided into a first wall part 721 and a second wall part 722 comprises a shell body 723 and a cover body 724, the shell body 723 forms a cavity 720 with an opening 7234, the electrode assembly 725 is arranged in the cavity 720, and the cover body 724 covers the opening 7234. The shell body 723 comprises a third wall body 7233, two first wall bodies 7231 arranged opposite in a first direction X, and two second wall bodies 7232 arranged opposite in a second direction Y, the second wall body 7232 is connected between the two first wall bodies 7231, and the first wall body 7231 and the second wall body 7232 form the cavity 720 around the third wall body 7233 with the opening 7234 at the end of the third direction Z, the area of the first wall body 7231 is greater than the area of the second wall body 7232 and the area of the third wall body 7233, and at least one first wall body 7231 is configured as the first wall part 721. The first wall part 721 comprises a first structural layer 7211 and a first heat conduction layer 7212, the first heat conduction layer 7212 is arranged on the outer surface of the first structural layer 7211 and the inner surface of the first structural layer 7211, and the thermal conductivity of the first heat conduction layer 7212 is greater than the thermal conductivity of the first structural layer 7211 and the thermal conductivity of the second wall part 722. By setting the thermal conductivity of the first wall part 721 which exchanges heat with the heat exchange element 6 to be greater than the thermal conductivity of the second wall part 722, the heat conduction capacity of the first wall part 721 is stronger than that of the second wall part 722, the heat generated by the battery cell 7 can be quickly transferred to the heat exchange element 6 through the first wall part 721, so that the heat generated by the battery cell 7 can be quickly taken away by the heat exchange element 6, thereby improving the heat exchange effect of the battery device 2, and enabling the battery device 2 to quickly adjust the temperature.

[0123] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, The battery device comprises: a battery cell comprising a shell and an electrode assembly, the electrode assembly being arranged in the shell, the shell comprising a first wall portion and a second wall portion connected to each other; a heat exchange member for exchanging heat with the first wall portion, the first wall portion having a thermal conductivity greater than that of the second wall portion.

2. The battery device according to claim 1, characterized by The first wall portion comprises a first structural layer connected to the second wall portion and a first thermal conductivity layer arranged on an outer surface of the first structural layer and / or an inner surface of the first structural layer, the first thermal conductivity layer having a thermal conductivity greater than that of the second wall portion and that of the first structural layer.

3. The battery device of claim 2, wherein, The first thermal conductivity layer has a thickness of H1 and the first structural layer has a thickness of H2, and H1 / H2≤10%.

4. The battery device according to claim 2 or 3, characterized by The first thermal conductivity layer has a hexagonal boron nitride structure, a diamond-like structure or a silicon carbide structure.

5. The battery device according to any one of claims 2 to 4, characterized by, The first thermal conductivity layer is arranged on both the outer surface of the first structural layer and the inner surface of the first structural layer, and the first thermal conductivity layer on the inner surface of the first structural layer has a thickness greater than that on the outer surface of the first structural layer.

6. The battery device according to any one of claims 2 to 5, characterized by, The second wall portion comprises a second structural layer connected to the first structural layer and a second thermal conductivity layer arranged on the second structural layer and connected to the first thermal conductivity layer, the second thermal conductivity layer having a thermal conductivity greater than that of the second structural layer, and the first thermal conductivity layer having a thermal conductivity greater than that of the second thermal conductivity layer.

7. The battery device according to any one of claims 1 to 6, characterized by, The first wall portion has a thickness less than that of the second wall portion.

8. The battery device of claim 1, wherein, The first wall portion has a polymer material structure containing hexagonal boron nitride, diamond-like or silicon carbide.

9. The battery device according to any one of claims 1 to 8, characterized by, The shell comprises a shell body and a cover body, the shell body forming a cavity having an opening, the electrode assembly being arranged in the cavity, the cover body being arranged on the opening, and the first wall portion being arranged on the shell body.

10. The battery device of claim 9, wherein, The shell body comprises a third wall body arranged opposite to the cover body, two first wall bodies arranged opposite in a first direction, and two second wall bodies arranged opposite in a second direction, the second wall bodies being connected between the two first wall bodies, the first wall bodies and the second wall bodies forming the cavity having the opening at an end portion in a third direction around the third wall body, and the first direction, the second direction and the third direction being perpendicular to each other.

11. The battery device of claim 10, wherein, The first wall bodies have an area greater than that of the second wall bodies, the first wall bodies have an area greater than that of the third wall body, and at least one of the first wall bodies is configured as the first wall portion.

12. The battery device of claim 10, wherein, The third wall body is configured as the first wall portion.

13. The battery device of claim 10, wherein, The first wall bodies have an area greater than that of the second wall bodies, and at least one of the second wall bodies is configured as the first wall portion.

14. The battery device of claim 10, wherein, Two of the first wall bodies, the second wall bodies and the third wall body are configured as the first wall portion.

15. An electrical device, comprising: The battery device comprises the battery device as claimed in any one of claims 1 to 14, and is configured to provide electric energy.

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