Battery device and electric device

Abstract

Embodiments of the present application provide a battery device and an electric device. The battery device comprises battery cells, thermally conductive members, and thermal management components. Each battery cell comprises a casing and electrode assemblies, and the electrode assemblies are accommodated in the casing; thermally conductive members are thermally connected to the casing, and the thermal conductivity coefficient of the thermally conductive members is greater than the thermal conductivity coefficient of the casing; and each thermal management component has an accommodating cavity, the accommodating cavity is used for accommodating a heat exchange medium, the thermal management component is thermally connected to the electrode assemblies by means of the casing and the thermally conductive members, so that the heat exchange medium performs heat exchange with the electrode assemblies. In this way, a faster heat transfer between the electrode assemblies and the thermal management components is enabled, the thermal management efficiency of the thermal management components for the electrode assemblies is improved, and the possibility of temperature runaway of the battery device is reduced.

Description

Battery devices and electrical appliances Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery device and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In battery technology, reducing the possibility of battery temperature runaway is a technical problem that urgently needs to be solved.

[0004] Summary of the Invention

[0005] This application provides a battery device and an electrical device that can reduce the possibility of temperature runaway in the battery device.

[0006] In a first aspect, this application provides a battery device, including a battery cell, a thermally conductive element, and a thermal management component. The battery cell includes a housing and an electrode assembly, with the electrode assembly housed within the housing. The thermally conductive element is thermally connected to the housing, and the thermal conductivity of the thermally conductive element is greater than that of the housing. The thermal management component has a receiving cavity for containing a heat exchange medium. The thermal management component is thermally connected to the electrode assembly via the housing and the thermally conductive element, so that the heat exchange medium and the electrode assembly can exchange heat.

[0007] In the above technical solution, by making the heat-conducting component thermally connected to the outer shell, and the thermal conductivity of the heat-conducting component is greater than that of the outer shell; the thermal management component has a receiving cavity for containing the heat exchange medium; the thermal management component is thermally connected to the electrode assembly via the outer shell and the heat-conducting component, so that the heat exchange medium and the electrode assembly can exchange heat, the heat transfer between the electrode assembly and the thermal management component can be faster, the thermal management efficiency of the thermal management component for the electrode assembly can be improved, thereby reducing the possibility of temperature runaway of the battery device.

[0008] In some embodiments of this application, the thermal conductive element includes a first thermal conductive element disposed inside the housing, and at least a portion of the first thermal conductive element is located between the electrode assembly and the housing.

[0009] In the above technical solution, by placing the first heat-conducting element inside the housing, and with at least a portion of the first heat-conducting element located between the electrode assembly and the housing, the first heat-conducting element is closer to the electrode assembly, and the heat transfer between the first heat-conducting element and the electrode assembly is faster, which helps to further reduce the possibility of temperature runaway of the battery device.

[0010] In some embodiments of this application, the first thermally conductive element is bonded to the electrode assembly and / or the housing.

[0011] In the above technical solution, by bonding the first heat-conducting element to the electrode assembly and / or the outer shell, the possibility of displacement of the first heat-conducting element relative to the electrode assembly and / or the outer shell is reduced, so that the first heat-conducting element maintains heat conduction to the electrode assembly, and the overall structure of the battery device is more stable.

[0012] In some embodiments of this application, the electrode assembly includes a body and a tab, the tab being connected to the body, and the battery cell also includes an electrode terminal disposed on the housing and electrically connected to the tab; a first heat-conducting element is disposed on at least a portion of the surface of the body.

[0013] In the above technical solution, by making the electrode assembly include a body and a tab, with the tab connected to the body, and the battery cell also includes an electrode terminal, which is disposed on the outer shell and electrically connected to the tab, the load can be electrically connected to the electrode assembly through the electrode terminal and the tab; by making the first heat-conducting element disposed on at least a portion of the surface of the body, the heat transfer between the body and the first heat-conducting element is faster, the thermal management component has higher thermal management efficiency for the electrode assembly, and the possibility of temperature runaway of the battery device is lower.

[0014] In some embodiments of this application, the main body includes a first surface and a second surface disposed opposite to each other along a first direction, the first direction being parallel to the thickness direction of the main body, and the first heat-conducting element includes a first sub-heat-conducting element disposed on the first surface and / or the second surface.

[0015] In the above technical solution, since the heat generated in the middle of the electrode assembly body is relatively high during the operation of the battery cell, by making the first heat-conducting element include a first sub-heat-conducting element, the first sub-heat-conducting element is disposed on the first surface and / or the second surface, so that the first sub-heat-conducting element can quickly conduct the heat generated in the middle of the body, thereby reducing the temperature gradient between different parts of the battery cell and improving the service life of the battery cell.

[0016] In some embodiments of this application, the first surface and / or the second surface is the surface with the largest area of ​​the electrode assembly.

[0017] In the above technical solution, by making the first surface and / or the second surface the surface with the largest area of ​​the electrode assembly, the heat exchange area between the first heat-conducting element and the main body can be larger, thereby improving the heat exchange speed and reducing the possibility of temperature runaway of the battery device.

[0018] In some embodiments of this application, the main body further includes a third surface and a fourth surface disposed opposite to each other along a second direction, the second direction being perpendicular to the first direction; a tab is disposed on the third surface and / or the fourth surface; the first heat-conducting element further includes a second sub-heat-conducting element disposed on the third surface and / or the fourth surface.

[0019] In the above technical solution, since the part where the electrode is located in the battery cell generates a lot of heat during the operation, by making the first heat-conducting element also include a second sub-heat-conducting element, which is disposed on the third surface and / or the fourth surface, the second sub-heat-conducting element can quickly conduct heat away from the part where the electrode is located, thereby reducing the temperature gradient between different parts of the battery cell and improving the service life of the battery cell.

[0020] In some embodiments of this application, the first sub-heat-conducting element is connected to the second sub-heat-conducting element.

[0021] In the above technical solution, by connecting the first sub-heat conductor to the second sub-heat conductor, heat can be transferred between the first sub-heat conductor and the second sub-heat conductor, which can further reduce the temperature gradient between different parts of the battery cell and help to further improve the service life of the battery cell.

[0022] In some embodiments of this application, the electrode tab includes a positive electrode tab and a negative electrode tab, which are spaced apart on the fourth surface; at least a portion of the second sub-heat-conducting element is disposed between the positive electrode tab and the negative electrode tab.

[0023] In the above technical solution, by disposing at least a portion of the second sub-heat conductor between the positive electrode tab and the negative electrode tab, the second sub-heat conductor can quickly conduct heat away from the portions where the positive electrode tab and the negative electrode tab are located, thereby reducing the temperature gradient between different parts of the battery cell and improving the service life of the battery cell.

[0024] In some embodiments of this application, the first sub-heat-conducting element and / or the second sub-heat-conducting element are provided with through holes.

[0025] In the above technical solution, by providing through holes in the first sub-heat conductor and / or the second sub-heat conductor, the material of the first heat conductor can be saved, the weight of the battery cell can be reduced, and the first heat conductor has a better heat conduction effect on the electrode assembly.

[0026] In some embodiments of this application, the main body further includes a fifth surface and a sixth surface disposed opposite to each other along a third direction, the third direction being perpendicular to the first direction; the first heat-conducting element further includes a third sub-heat-conducting element disposed on the fifth surface and / or the sixth surface.

[0027] In the above technical solution, by making the first heat-conducting element further include a third sub-heat-conducting element, which is disposed on the fifth surface and / or the sixth surface, the third sub-heat-conducting element can quickly conduct heat generated by the main body, thereby reducing the temperature gradient between different parts of the battery cell and improving the service life of the battery cell.

[0028] In some embodiments of this application, the first sub-heat-conducting element is connected to the third sub-heat-conducting element.

[0029] In the above technical solution, by connecting the first sub-heat conductor to the third sub-heat conductor, heat can be transferred between the first sub-heat conductor and the third sub-heat conductor, which can further reduce the temperature gradient between different parts of the battery cell and help to further improve the service life of the battery cell.

[0030] In some embodiments of this application, the battery cell includes multiple electrode assemblies arranged along a first direction parallel to the thickness direction of the electrode assemblies, and at least a portion of the first thermal conductive element is disposed between two adjacent electrode assemblies.

[0031] In the above technical solution, since more heat is more easily generated between two adjacent electrode components, by disposing at least a portion of the first heat-conducting element between two adjacent electrode components, the heat between the two adjacent electrode components can be discharged through the first heat-conducting element, thereby making the thermal management component more efficient in managing the thermal components of the electrode components and reducing the possibility of temperature runaway of the battery device.

[0032] In some embodiments of this application, multiple first heat-conducting elements are provided, and each of the multiple first heat-conducting elements corresponds to a multiple electrode assembly.

[0033] In the above technical solution, by providing multiple first heat-conducting elements, and each of the multiple first heat-conducting elements corresponding to multiple electrode assemblies, each electrode assembly can conduct heat out through the first heat-conducting elements, thereby reducing the temperature gradient between different parts of the battery cell, which is beneficial to improving the service life of the battery cell and reducing the possibility of temperature runaway of the battery device.

[0034] In some embodiments of this application, a plurality of first heat-conducting elements are connected end to end along a first direction.

[0035] In the above technical solution, by connecting multiple first heat-conducting elements end to end along the first direction, the heat of multiple electrode assemblies can be conducted to each other through the multiple first heat-conducting elements, thereby reducing the temperature gradient between different parts of the battery cell, which is beneficial to improving the service life of the battery cell and reducing the possibility of temperature runaway of the battery device.

[0036] In some embodiments of this application, the thermal conductive element includes a second thermal conductive element disposed outside the housing, and at least a portion of the second thermal conductive element is located between the housing and the thermal management component.

[0037] In the above technical solution, by placing the second heat-conducting element outside the housing, and with at least a portion of the second heat-conducting element located between the housing and the thermal management component, the second heat-conducting element is closer to the thermal management component, and the heat transfer between the second heat-conducting element and the thermal management component is faster, which helps to further reduce the possibility of temperature runaway of the battery device.

[0038] In some embodiments of this application, the second thermally conductive element is bonded to the housing and / or thermal management components.

[0039] In the above technical solution, by bonding the second thermal conductive element to the outer casing and / or thermal management components, the possibility of displacement of the second thermal conductive element relative to the outer casing and / or thermal management components is reduced, so that the second thermal conductive element maintains thermal conductivity to the electrode assembly, and the overall structure of the battery device is more stable.

[0040] In some embodiments of this application, a second heat-conducting element is disposed on at least a portion of the wall of the housing.

[0041] In the above technical solution, by disposing the second heat-conducting element on at least a portion of the outer wall of the casing, the heat transfer between the battery cell and the second heat-conducting element can be faster, the thermal management component has higher thermal management efficiency for the battery cell, and the possibility of temperature runaway of the battery device is lower.

[0042] In some embodiments of this application, the outer casing includes a first wall and a second wall disposed opposite to each other along a first direction, the first direction being parallel to the thickness direction of the outer casing, and the second heat-conducting element includes a first heat-conducting portion disposed on the first wall and / or the second wall.

[0043] In the above technical solution, since the heat generated in the middle of the battery cell is relatively high during the operation of the battery cell, by making the second heat-conducting component include the first heat-conducting part, which is disposed on the first wall and / or the second wall, the first heat-conducting part can quickly conduct the heat generated in the middle of the battery cell, thereby reducing the temperature gradient between different parts of the battery cell and improving the service life of the battery cell.

[0044] In some embodiments of this application, the first wall and / or the second wall are the walls with the largest area of ​​the outer shell.

[0045] In the above technical solution, by making the first wall and / or the second wall the wall with the largest area of ​​the outer shell, the heat exchange area between the second heat-conducting element and the battery cell can be larger, thereby increasing the heat exchange speed and reducing the possibility of temperature runaway of the battery device.

[0046] In some embodiments of this application, the housing further includes a third wall and a fourth wall disposed opposite to each other along a second direction, the second direction being perpendicular to the first direction; the battery cell further includes an electrode terminal, the electrode terminal being electrically connected to an electrode assembly, the electrode terminal being disposed on the third wall and / or the fourth wall; the second heat-conducting element further includes a second heat-conducting portion, the second heat-conducting portion being disposed on the third wall and / or the fourth wall.

[0047] In the above technical solution, since the part where the electrode terminal is located generates a lot of heat during the operation of the battery cell, by making the second heat-conducting component also include a second heat-conducting part, which is disposed on the third wall and / or the fourth wall, the second heat-conducting part can quickly conduct the heat of the part where the electrode terminal is located, thereby reducing the temperature gradient between different parts of the battery cell and improving the service life of the battery cell.

[0048] In some embodiments of this application, the first heat-conducting part is connected to the second heat-conducting part.

[0049] In the above technical solution, by connecting the first heat-conducting part and the second heat-conducting part, heat can be transferred between the first heat-conducting part and the second heat-conducting part, which can further reduce the temperature gradient between different parts of the battery cell and help to further improve the service life of the battery cell.

[0050] In some embodiments of this application, the electrode terminal includes a positive terminal and a negative terminal, which are spaced apart on the fourth wall; at least a portion of the second heat-conducting part is disposed between the positive terminal and the negative terminal.

[0051] In the above technical solution, by disposing at least part of the second heat-conducting part between the positive terminal and the negative terminal, the second heat-conducting part can quickly conduct heat away from the parts where the positive terminal and the negative terminal are located, thereby reducing the temperature gradient between different parts of the battery cell and improving the service life of the battery cell.

[0052] In some embodiments of this application, the housing further includes a fifth wall and a sixth wall disposed opposite to each other along a third direction, the third direction being perpendicular to the first direction; the second heat-conducting element further includes a third heat-conducting portion disposed on the fifth wall and / or the sixth wall.

[0053] In the above technical solution, by making the second heat-conducting element further include a third heat-conducting part, which is disposed on the fifth wall and / or the sixth wall, the third heat-conducting part can quickly conduct the heat generated by the battery cell, thereby reducing the temperature gradient between different parts of the battery cell and improving the service life of the battery cell.

[0054] In some embodiments of this application, the first heat-conducting part is connected to the third heat-conducting part.

[0055] In the above technical solution, by connecting the first heat-conducting part and the third heat-conducting part, heat can be transferred between the first heat-conducting part and the third heat-conducting part, which can further reduce the temperature gradient between different parts of the battery cell and help to further improve the service life of the battery cell.

[0056] In some embodiments of this application, the battery device includes a plurality of battery cells, a plurality of electrode cells arranged along a first direction parallel to the thickness direction of the battery cells, and at least a portion of a second heat-conducting element disposed between two adjacent battery cells.

[0057] In the above technical solution, since more heat is more easily generated between two adjacent battery cells, by disposing at least a portion of the second heat-conducting element between two adjacent battery cells, the heat between the two adjacent battery cells can be discharged through the second heat-conducting element, thereby making the thermal management component more efficient in managing the thermal of the battery cells and reducing the possibility of temperature runaway in the battery device.

[0058] In some embodiments of this application, multiple second heat-conducting elements are provided, and each of the multiple second heat-conducting elements corresponds to a multiple battery cell.

[0059] In the above technical solution, by setting multiple second heat-conducting elements, each of which corresponds to a single battery cell, each battery cell can dissipate heat through the second heat-conducting elements. This reduces the temperature gradient between different parts of the battery device, which is beneficial for improving the service life of the battery device and reducing the possibility of temperature runaway.

[0060] In some embodiments of this application, multiple second heat-conducting elements are connected end to end along a first direction.

[0061] In the above technical solution, by connecting multiple second heat-conducting elements end to end along the first direction, the heat of multiple battery cells can be conducted to each other through the multiple second heat-conducting elements, thereby reducing the temperature gradient between different parts of the battery device, which is beneficial to improving the service life of the battery device and reducing the possibility of temperature runaway of the battery device.

[0062] In some embodiments of this application, the housing includes a first wall and a second wall disposed opposite to each other along a first direction, the first direction being parallel to the thickness direction of the housing; thermal management components are disposed on the first wall and / or the second wall.

[0063] In the above technical solution, since the heat generated in the middle of the electrode assembly body is relatively high during the operation of the battery cell, by setting thermal management components on the first wall and / or the second wall, the thermal management components can quickly conduct the heat generated in the middle of the battery cell, thereby reducing the temperature gradient between different parts of the battery cell and improving the service life of the battery cell.

[0064] In some embodiments of this application, the first wall and / or the second wall are the walls with the largest area of ​​the outer shell.

[0065] In the above technical solution, by making the first wall and / or the second wall the wall with the largest area of ​​the outer shell, the area for heat exchange between the thermal management component and the battery cell can be larger, thereby increasing the heat exchange speed and reducing the possibility of temperature runaway of the battery device.

[0066] In some embodiments of this application, the housing further includes a third and a fourth wall disposed opposite to each other along a second direction, and a fifth and a sixth wall disposed opposite to each other along a third direction, wherein the first, second, and third directions are perpendicular to each other; at least one of the third, fourth, fifth, and sixth walls is provided with a thermal management component.

[0067] In the above technical solution, by providing thermal management components in at least one of the third wall, fourth wall, fifth wall and sixth wall, the thermal management components can quickly dissipate the heat generated by the battery cell, thereby reducing the temperature gradient between different parts of the battery cell and improving the service life of the battery cell.

[0068] In some embodiments of this application, the thermal conductive element includes a first thermal conductive element and a second thermal conductive element; the first thermal conductive element is disposed inside the housing, and at least a portion of the first thermal conductive element is located between the electrode assembly and the housing; the second thermal conductive element is disposed outside the housing, and at least a portion of the second thermal conductive element is located between the housing and the thermal management component; wherein at least a portion of the first thermal conductive element and the second thermal conductive element are disposed opposite to each other.

[0069] In the above technical solution, by making at least a portion of the first heat-conducting element and the second heat-conducting element arranged opposite to each other, the first heat-conducting element can conduct the heat of the electrode assembly to the outer casing, and the second heat-conducting element can quickly conduct the heat on the outer casing to the thermal management component. This makes the thermal management speed of the heat-conducting element faster and the thermal management efficiency higher, which helps to reduce the possibility of temperature runaway of the battery device and helps to improve the service life of the battery device.

[0070] In some embodiments of this application, the thermal conductivity of the heat-conducting element is greater than or equal to 500 W / (m·K).

[0071] In the above technical solution, by making the thermal conductivity of the heat-conducting component greater than or equal to 500 W / (m·K), the heat conduction efficiency of the heat-conducting component can be higher and the heat conduction effect can be better. This is beneficial to improving the thermal management efficiency of the thermal management component for the battery cell, thereby reducing the possibility of temperature runaway of the battery device.

[0072] In some embodiments of this application, the material of the heat-conducting element includes at least one of graphite, graphene, and carbon nanotubes.

[0073] In the above technical solution, by making the material of the heat-conducting component include at least one of graphite, graphene, and carbon nanotubes, the heat conduction efficiency of the heat-conducting component can be made higher and the heat conduction effect can be better. This is beneficial to improving the thermal management efficiency of the thermal management component for the battery cell, thereby reducing the possibility of temperature runaway of the battery device.

[0074] In some embodiments of this application, an insulating layer is provided on the surface of the heat-conducting element.

[0075] In the above technical solution, by providing an insulating layer on the surface of the heat-conducting component, the insulation performance of the heat-conducting component can be improved, the possibility of short circuit in a single battery cell can be reduced, thereby reducing the possibility of temperature runaway in the battery device.

[0076] Secondly, this application provides an electrical device including the aforementioned battery device, which is used to provide electrical energy. Attached Figure Description

[0077] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0078] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0079] Figure 2 is an exploded structural diagram of a battery device provided in some embodiments of this application;

[0080] Figure 3 is a perspective view of a portion of the structure of a battery device provided in some embodiments of this application;

[0081] Figure 4 is a cross-sectional structural diagram of a battery cell provided in some embodiments of this application;

[0082] Figure 5 is a three-dimensional structural schematic diagram of the main body of the electrode assembly of the battery provided in some embodiments of this application;

[0083] Figure 6 is a perspective view of a portion of the structure of a battery device provided in some other embodiments of this application;

[0084] Figure 7 is a cross-sectional schematic diagram of a portion of the structure of a battery device provided in some other embodiments of this application;

[0085] Figure 8 is a perspective view of a portion of the structure of a battery device provided in some other embodiments of this application;

[0086] Figure 9 is a perspective view of a portion of the structure of a battery device provided in some other embodiments of this application;

[0087] Figure 10 is a cross-sectional schematic diagram of a portion of the structure of a battery device provided in some other embodiments of this application;

[0088] Figure 11 is a perspective view of a portion of the structure of a battery device provided in some other embodiments of this application;

[0089] Figure 12 is a perspective view of a portion of the structure of a battery device provided in some other embodiments of this application;

[0090] Figure 13 is a perspective view of a portion of the structure of a battery device provided in some other embodiments of this application;

[0091] Figure 14 is a perspective view of a portion of the structure of a battery device provided in some other embodiments of this application;

[0092] Figure 15 is a cross-sectional schematic diagram of a portion of the structure of a battery device provided in some other embodiments of this application;

[0093] Figure 16 is a cross-sectional schematic diagram of a portion of the structure of a battery device provided in some other embodiments of this application;

[0094] Figure 17 is an exploded view of a portion of the battery structure provided in some other embodiments of this application;

[0095] Figure 18 is a cross-sectional schematic diagram of a portion of the battery structure provided in some other embodiments of this application;

[0096] Figure 19 is a three-dimensional structural schematic diagram of a battery device provided in some other embodiments of this application;

[0097] Figure 20 is a schematic diagram from one perspective of a partial structure of a battery device provided in some other embodiments of this application;

[0098] Figure 21 is a three-dimensional structural schematic diagram of a battery device provided in some other embodiments of this application.

[0099] Icons: 1000 - Vehicle; 100 - Battery Unit; 10 - Housing; 11 - First Sub-Housing; 12 - Second Sub-Housing; 20 - Battery Cell; 20a - First Battery Cell; 20b - Second Battery Cell; 20c - Third Battery Cell; 210 - Housing; 210a - Main Housing; 210b - End Cap; 211 - First Wall; 212 - Second Wall; 213 - Third Wall; 214 - Fourth Wall; 215 - Fifth Wall; 216 - Sixth Wall; 220 - Electrode Assembly; 220a - First Electrode Assembly; 220b - Second Electrode Assembly; 220c - Third Electrode Assembly; 221 - Main Body; 2211 - First Surface; 2212 - Second Surface; 2213 - Third Surface; 221 4-Fourth surface; 2215-Fifth surface; 2216-Sixth surface; 222-Taper; 2221-Positive electrode tab; 2222-Negative electrode tab; 230-Electrode terminal; 231-Positive terminal; 232-Negative terminal; 310-First thermal conductive element; 311-First sub-thermal conductive element; 312-Second sub-thermal conductive element; 313-Third sub-thermal conductive element; 314-Through hole; 320-Second thermal conductive element; 321-First thermal conductive section; 322-Second thermal conductive section; 323-Third thermal conductive section; 410-First thermal management component; 420-Second thermal management component; 430-Third thermal management component; 200-Controller; 300-Motor; X-First direction; Y-Second direction; Z-Third direction.

[0100] Specific implementation methods

[0101] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0102] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0103] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0104] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0105] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0106] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0107] In this application, "multiple" means two or more (including two).

[0108] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0109] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0110] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0111] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0112] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0113] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0114] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0115] As an example, a battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can pass through without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0116] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0117] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0118] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0119] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, making them an important component of today's new energy development. With the development of the new energy industry, battery devices are gradually moving towards integration and fast charging.

[0120] However, the battery device generates a lot of heat during fast charging, causing the internal temperature of the battery device to rise sharply, affecting the performance and lifespan of the battery device, and there is a possibility of temperature runaway of the battery device.

[0121] Based on the above considerations, this application provides a battery device, which includes a battery cell, a heat-conducting component, and a thermal management component. The battery cell includes a housing and an electrode assembly, with the electrode assembly housed within the housing. The heat-conducting component is thermally connected to the housing, and the thermal conductivity of the heat-conducting component is greater than that of the housing. The thermal management component has a receiving cavity for containing a heat exchange medium. The thermal management component is thermally connected to the electrode assembly via the housing and the heat-conducting component to enable heat exchange between the heat exchange medium and the electrode assembly.

[0122] In this application's technical solution, by making the heat-conducting component thermally connected to the outer casing, and the thermal conductivity of the heat-conducting component being greater than that of the outer casing; the thermal management component has a receiving cavity for containing the heat exchange medium; the thermal management component is thermally connected to the electrode assembly via the outer casing and the heat-conducting component, so that the heat exchange medium and the electrode assembly can exchange heat, enabling faster heat transfer between the electrode assembly and the thermal management component, improving the thermal management efficiency of the thermal management component for the electrode assembly, thereby reducing the possibility of temperature runaway in the battery device.

[0123] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0124] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0125] The battery devices described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all electrical devices that use battery devices. However, for the sake of brevity, the following embodiments use a vehicle as an example of an electrical device for illustration.

[0126] Please refer to Figure 1, which is a schematic diagram of the vehicle structure provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0127] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0128] Please refer to Figure 2, which is an exploded structural diagram of a battery device provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can employ various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The first sub-housing 11 may be a hollow structure with one open end, and the second sub-housing 12 may be a plate-like structure, covering the open side of the first sub-housing 11 so that the first sub-housing 11 and the second sub-housing 12 jointly define the space; alternatively, both the first sub-housing 11 and the second sub-housing 12 may be hollow structures with one open side, with the open side of the second sub-housing 12 covering the open side of the first sub-housing 11.

[0129] In some embodiments, the housing 10 can be a cuboid. In other embodiments, the housing 10 can also be a cylinder.

[0130] In some embodiments, the housing 10 may be made of aluminum, aluminum alloy or other metal materials, so that the housing 10 has high load-bearing capacity.

[0131] In other embodiments, the housing 10 may also be made of high-strength non-metallic materials such as carbon fiber or rigid plastic.

[0132] In the battery device 100, there can be one or more battery cells 20. If there are multiple battery cells 20, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the battery cell group composed of multiple battery cells 20 is housed in the housing 10. Of course, the battery cell group can also be formed by first connecting multiple battery cells in series, in parallel, or in a mixed configuration to form a battery cell group module, and then connecting multiple battery cell group modules in series, in parallel, or in a mixed configuration to form a whole, which is then housed in the housing 10. The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component for realizing the electrical connection between multiple battery cells 20. The busbar component can be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0133] Please refer to Figures 3 and 4. Figure 3 is a perspective view of a portion of the structure of a battery device provided in some embodiments of this application; Figure 4 is a cross-sectional view of a battery cell provided in some embodiments of this application.

[0134] Some embodiments of this application provide a battery device 100, including a battery cell 20, a heat-conducting element, and a thermal management component. The battery cell 20 includes a housing 210 and an electrode assembly 220, with the electrode assembly 220 housed within the housing 210. The heat-conducting element is thermally connected to the housing 210, and the thermal conductivity of the heat-conducting element is greater than that of the housing 210. The thermal management component has a receiving cavity for containing a heat exchange medium. The thermal management component is thermally connected to the electrode assembly 220 via the housing 210 and the heat-conducting element, so that the heat exchange medium and the electrode assembly 220 can exchange heat.

[0135] By making the heat-conducting element thermally connected to the housing 210, and the thermal conductivity of the heat-conducting element being greater than that of the housing 210, the thermal management component has a receiving cavity for containing the heat exchange medium. The thermal management component is thermally connected to the electrode assembly 220 via the housing 210 and the heat-conducting element, so that the heat exchange medium and the electrode assembly 220 can exchange heat. This enables faster heat transfer between the electrode assembly 220 and the thermal management component, improves the thermal management efficiency of the thermal management component for the electrode assembly 220, and reduces the possibility of temperature runaway in the battery device 100.

[0136] Thermal conductivity refers to the amount of heat transferred through a 1-meter-thick material with a temperature difference of 1 degree (K or °C) between its two surfaces in 1 second under steady-state heat transfer conditions. The unit is watts per meter-degree (W / (m·K)).

[0137] In some embodiments, the method for testing thermal conductivity may include the steady-state heat flow method (test standards such as ASTM D5470 and GB5598), specifically: the sample to be tested is placed between two metal rods, and a certain force is applied to make the ends of the metal rods adhere tightly to the sample, reducing the air gap and contact thermal resistance between the contact interfaces. Controllable input heat is provided by a heat source, flowing through the metal rods → sample → metal rods. The thermal resistance is measured based on the average heat flow through the sample and the temperature difference, and the thermal conductivity is calculated based on the ratio of thermal resistance to thickness.

[0138] In other embodiments, the test methods for thermal conductivity may also include the pyrometer flow method (test standards such as ASTM C518, ASTM E1530, etc.), the hot wire method (test standards such as ASTM D5334, GB / T10297, etc.), the transient plane heat source method (test standards such as ASTM E1461, GB22588, etc.), etc.

[0139] In some embodiments, the battery cell 20 can be cuboid, so that multiple battery cells 20 can be arranged in a matrix, which is beneficial to improving the energy density of the battery.

[0140] In other embodiments, the battery cell 20 may also be flat, cylindrical or other shapes.

[0141] The battery device 100 exhibits different electrical cycle performance under different ambient temperatures. Excessively high or low ambient temperatures can lead to a decrease in the cycle performance of the battery device 100, and even shorten its lifespan. Battery thermal management, based on the impact of temperature on the performance of the battery device 100, combined with its electrochemical characteristics and heat generation mechanism, and considering its optimal charge / discharge temperature range, is a technology that addresses heat dissipation or temperature runaway issues caused by the battery device 100 operating at excessively high or low temperatures, thereby improving the overall performance of the battery device 100. Thermal management of the battery device 100 can be achieved by incorporating thermal management components.

[0142] The heat exchange medium can be a liquid or a gas. Liquids may include water, ethylene glycol, etc., and gases may include air. Thermal management refers to cooling or heating the battery cell 20. For example, when the battery cell 20 is generating heat or the battery device 100 is in a relatively hot environment, the battery cell 20 can be cooled. Conversely, when the battery device 100 is in a relatively cold environment, the battery cell 20 can be heated.

[0143] In some embodiments, the thermal conductive element includes a first thermal conductive element 310 disposed inside the housing 210, and at least a portion of the first thermal conductive element 310 is located between the electrode assembly 220 and the housing 210.

[0144] By placing the first heat-conducting element 310 inside the housing 210, and with at least a portion of the first heat-conducting element 310 located between the electrode assembly 220 and the housing 210, the first heat-conducting element 310 is closer to the electrode assembly 220, resulting in faster heat transfer between the first heat-conducting element 310 and the electrode assembly 220, which helps to further reduce the possibility of temperature runaway in the battery device 100.

[0145] In some embodiments, the first thermally conductive element 310 is bonded to the electrode assembly 220 and / or the housing 210.

[0146] By bonding the first thermal conductive element 310 to the electrode assembly 220 and / or the housing 210, the possibility of displacement of the first thermal conductive element 310 relative to the electrode assembly 220 and / or the housing 210 is reduced, so that the first thermal conductive element 310 maintains thermal conductivity to the electrode assembly 220, and the overall structural stability of the battery device 100 is higher.

[0147] In some embodiments, the first thermally conductive element 310 can be bonded to the electrode assembly 220 and / or the housing 210 with thermally conductive adhesive, so that heat can be quickly conducted through the thermally conductive adhesive, which is beneficial to improving the heat exchange efficiency between the battery cell 20 and the thermal management component.

[0148] In some embodiments, the electrode assembly 220 includes a body 221 and a tab 222, the tab 222 being connected to the body 221, and the battery cell 20 also includes an electrode terminal 230, the electrode terminal 230 being disposed on the housing 210, and the electrode terminal 230 being electrically connected to the tab 222.

[0149] By making the electrode assembly 220 include a body 221 and a tab 222, with the tab 222 connected to the body 221, and the battery cell 20 also includes an electrode terminal 230, which is disposed on the housing 210 and electrically connected to the tab 222, the load can be electrically connected to the electrode assembly 220 through the electrode terminal 230 and the tab 222.

[0150] In some embodiments, the first heat-conducting element 310 is disposed on at least a portion of the surface of the body 221.

[0151] By disposing the first heat-conducting element 310 on at least a portion of the surface of the main body 221, the heat transfer between the main body 221 and the first heat-conducting element 310 is faster, the thermal management component has higher thermal management efficiency for the electrode assembly 220, and the possibility of temperature runaway in the battery device 100 is lower.

[0152] In some embodiments, the electrode terminal 230 may be made of metal materials such as copper-plated silver, copper-plated zinc, copper, aluminum, or iron, and may serve to conduct electricity and transmit electrical signals.

[0153] In some embodiments, the electrode terminal 230 may be arranged in a cuboid shape.

[0154] In other embodiments, the electrode terminal 230 may also be arranged in the shape of a cylinder, an elliptical cylinder, or the like.

[0155] In some embodiments, the electrode assembly 220 is formed by winding a positive electrode sheet, a separator, and a negative electrode sheet that are stacked together.

[0156] In other embodiments, the electrode assembly 220 may be formed by stacking multiple positive electrode plates, multiple separators and multiple negative electrode plates.

[0157] Please refer to Figures 4 and 5. Figure 5 is a three-dimensional structural schematic diagram of the main body of the electrode assembly of the battery provided in some embodiments of this application.

[0158] In some embodiments, the body 221 includes a first surface 2211 and a second surface 2212 disposed opposite to each other along a first direction X, the first direction X being parallel to the thickness direction of the body 221, and the first heat-conducting element 310 including a first sub-heat-conducting element 311 disposed on the first surface 2211 and / or the second surface 2212.

[0159] Since the battery cell 20 generates a high amount of heat in the middle of the main body 221 of the electrode assembly 220 during operation, by making the first heat conductor 310 include a first sub-heat conductor 311, which is disposed on the first surface 2211 and / or the second surface 2212, the first sub-heat conductor 311 can quickly conduct the heat generated in the middle of the main body 221, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0160] In some embodiments, the first heat-conducting element 310 includes a first sub-heat-conducting element 311, which is disposed on the first surface 2211 or the second surface 2212. This allows the first sub-heat-conducting element 311 to quickly conduct heat generated in the middle of the main body 221 through the first surface 2211 or the second surface 2212, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0161] In some embodiments, the first heat-conducting element 310 includes two first sub-heat-conducting elements 311, which are respectively disposed on the first surface 2211 and the second surface 2212. This allows the two first sub-heat-conducting elements 311 to quickly conduct heat generated in the middle of the main body 221 through the first surface 2211 and the second surface 2212, thereby further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0162] In some embodiments, the first surface 2211 and / or the second surface 2212 are the surfaces of the electrode assembly 220 with the largest area.

[0163] By making the first surface 2211 and / or the second surface 2212 the surfaces with the largest area of ​​the electrode assembly 220, the area for heat exchange between the first heat-conducting element 310 and the main body 221 can be larger, thereby increasing the heat exchange speed and reducing the possibility of temperature runaway of the battery device 100.

[0164] In some embodiments, the main body 221 further includes a third surface 2213 and a fourth surface 2214 disposed opposite to each other along a second direction Y, the second direction Y being perpendicular to the first direction X. A tab 222 is disposed on the third surface 2213 and / or the fourth surface 2214. The first heat-conducting element 310 further includes a second sub-heat-conducting element 312, which is disposed on the third surface 2213 and / or the fourth surface 2214.

[0165] Since the part of the battery cell 20 where the tab 222 is located generates a lot of heat during operation, by making the first heat-conducting element 310 also include a second sub-heat-conducting element 312, which is disposed on the third surface 2213 and / or the fourth surface 2214, the second sub-heat-conducting element 312 can quickly conduct heat away from the part where the tab 222 is located, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0166] In some embodiments, the first sub-heat conductor 311 is connected to the second sub-heat conductor 312.

[0167] By connecting the first sub-heat conductor 311 and the second sub-heat conductor 312, heat can be transferred between the first sub-heat conductor 311 and the second sub-heat conductor 312, which can further reduce the temperature gradient between different parts of the battery cell 20 and help to further improve the service life of the battery cell 20.

[0168] In some embodiments, the first sub-heat conductor 311 and the second sub-heat conductor 312 can be integrally formed. This makes the overall structure of the first heat conductor 310 more stable.

[0169] In other embodiments, the first sub-heat conductor 311 and the second sub-heat conductor 312 may also be bonded, heat-fused, or otherwise connected.

[0170] Referring to Figures 4 and 5, in some embodiments, the first heat-conducting element 310 includes two first sub-heat-conducting elements 311 and one second sub-heat-conducting element 312. The two first sub-heat-conducting elements 311 are respectively disposed on the first surface 2211 and the second surface 2212, and the second sub-heat-conducting element 312 is disposed on the third surface 2213. The second sub-heat-conducting element 312 connects the two first sub-heat-conducting elements 311. This allows the two first sub-heat-conducting elements 311 to quickly transfer the heat generated in the middle of the main body 221 to the sides of the main body 221, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. Furthermore, the heat from the main body 221 can be further transferred to the second sub-heat-conducting element 312 located on the third surface 2213, further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0171] In other embodiments, the first heat-conducting element 310 includes two first sub-heat-conducting elements 311 and one second sub-heat-conducting element 312. The two first sub-heat-conducting elements 311 are respectively disposed on the first surface 2211 and the second surface 2212, and the second sub-heat-conducting element 312 is disposed on the fourth surface 2214. The second sub-heat-conducting element 312 connects the two first sub-heat-conducting elements 311. This allows the two first sub-heat-conducting elements 311 to quickly transfer the heat generated in the middle of the main body 221 to the sides of the main body 221, and allows the heat generated by the tab 222 to be quickly transferred to other parts through the second sub-heat-conducting element 312 located on the fourth surface 2214. This reduces the temperature gradient between different parts of the battery cell 20 and helps to improve the service life of the battery cell 20.

[0172] In some embodiments, the first heat-conducting element 310 includes a first sub-heat-conducting element 311 and a second sub-heat-conducting element 312. The first sub-heat-conducting element 311 is disposed on the first surface 2211 or the second surface 2212, and the second sub-heat-conducting element 312 is disposed on the third surface 2213 or the fourth surface 2214. The first sub-heat-conducting element 311 and the second sub-heat-conducting element 312 are connected. This allows the first sub-heat-conducting element 311 to quickly transfer the heat generated in the middle of the main body 221 to the sides of the main body 221, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. Similarly, the heat generated by the tab 222 can be quickly transferred to other parts through the second sub-heat-conducting element 312 located on the fourth surface 2214, or the heat of the main body 221 can be further transferred to the second sub-heat-conducting element 312 located on the third surface 2213, further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0173] Please refer to Figures 6 and 7. Figure 6 is a perspective view of a portion of the structure of a battery device provided in some embodiments of this application; Figure 7 is a cross-sectional view of a portion of the structure of a battery device provided in some embodiments of this application.

[0174] In some embodiments, the first heat-conducting element 310 includes two first sub-heat-conducting elements 311 and two second sub-heat-conducting elements 312. The two first sub-heat-conducting elements 311 are respectively disposed on the first surface 2211 and the second surface 2212, and the two second sub-heat-conducting elements 312 are respectively disposed on the third surface 2213 and the fourth surface 2214. Each second sub-heat-conducting element 312 is connected to the two first sub-heat-conducting elements 311. The two first sub-heat conductors 311 can quickly transfer the heat generated in the middle of the main body 221 to the sides of the main body 221, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20; the heat generated by the tab 222 can be quickly transferred to other parts through the second sub-heat conductor 312 located on the fourth surface 2214, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20; the heat of the main body 221 can be further transferred to the second sub-heat conductor 312 located on the third surface 2213, further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0175] In some embodiments, the tab 222 includes a positive tab 2221 and a negative tab 2222, which are spaced apart on the fourth surface 2214. At least a portion of the second sub-heat conductor 312 is disposed between the positive tab 2221 and the negative tab 2222.

[0176] By disposing at least a portion of the second sub-heat conductor 312 between the positive electrode tab 2221 and the negative electrode tab 2222, the second sub-heat conductor 312 can quickly conduct heat away from the portions where the positive electrode tab 2221 and the negative electrode tab 2222 are located, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0177] Please refer to Figure 8, which is a perspective view of a portion of the structure of a battery device provided in some other embodiments of this application.

[0178] In some embodiments, the first sub-heat conductor 311 and / or the second sub-heat conductor 312 are provided with through holes 314.

[0179] By providing through holes 314 in the first sub-heat conductor 311 and / or the second sub-heat conductor 312, the material of the first heat conductor 310 can be saved, the weight of the battery cell 20 can be reduced, and the first heat conductor 310 has a better heat conduction effect on the electrode assembly 220.

[0180] In some embodiments, the through hole 314 is a strip-shaped hole that extends along the second direction Y, which enables the heat of the first sub-heat conductor 311 to be quickly conducted to the second sub-heat conductor 312 along the second direction Y, thereby improving the heat conduction efficiency of the first heat conductor 310.

[0181] In some embodiments, the number of through holes 314 is multiple, and the multiple through holes 314 are spaced apart along the third direction Z, which can further reduce the weight of the battery cell 20.

[0182] Please refer to Figures 5, 9 to 11. Figure 9 is a perspective view of a partial structure of a battery device provided in some embodiments of this application; Figure 10 is a cross-sectional view of a partial structure of a battery device provided in some embodiments of this application; and Figure 11 is a perspective view of a partial structure of a battery device provided in some embodiments of this application.

[0183] In some embodiments, the main body 221 further includes a fifth surface 2215 and a sixth surface 2216 disposed opposite each other along a third direction Z, the third direction Z being perpendicular to the first direction X. The first heat-conducting element 310 further includes a third sub-heat-conducting element 313 disposed on the fifth surface 2215 and / or the sixth surface 2216.

[0184] Among them, the fifth surface 2215 and the sixth surface 2216 are not provided with tabs 222.

[0185] By including a third sub-heat conductor 313 in the first heat conductor 310, the third sub-heat conductor 313 is disposed on the fifth surface 2215 and / or the sixth surface 2216, so that the third sub-heat conductor 313 can quickly conduct heat generated by the main body 221, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0186] In some embodiments, the first sub-heat conductor 311 is connected to the third sub-heat conductor 313.

[0187] By connecting the first sub-heat conductor 311 and the third sub-heat conductor 313, heat can be transferred between the first sub-heat conductor 311 and the third sub-heat conductor 313, which can further reduce the temperature gradient between different parts of the battery cell 20 and help to further improve the service life of the battery cell 20.

[0188] In some embodiments, the first sub-heat conductor 311 and the third sub-heat conductor 313 can be integrally formed. This makes the overall structure of the first heat conductor 310 more stable.

[0189] In other embodiments, the first sub-heat conductor 311 and the third sub-heat conductor 313 may also be bonded, heat-fused, or otherwise connected.

[0190] In some embodiments, the first heat-conducting element 310 includes two first sub-heat-conducting elements 311 and two third sub-heat-conducting elements 313. The two first sub-heat-conducting elements 311 are respectively disposed on the first surface 2211 and the second surface 2212, and the two third sub-heat-conducting elements 313 are respectively disposed on the fifth surface 2215 and the sixth surface 2216. Each third sub-heat-conducting element 313 connects to the two first sub-heat-conducting elements 311. This allows the two first sub-heat-conducting elements 311 to quickly transfer the heat generated in the middle of the main body 221 to the sides of the main body 221, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. Furthermore, the heat from the main body 221 can be further transferred to the two third sub-heat-conducting elements 313, further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0191] In some embodiments, the first heat-conducting element 310 includes two first sub-heat-conducting elements 311 and one third sub-heat-conducting element 313. The two first sub-heat-conducting elements 311 are respectively disposed on the first surface 2211 and the second surface 2212, and the third sub-heat-conducting element 313 is disposed on the fifth surface 2215 or the sixth surface 2216. The third sub-heat-conducting element 313 connects the two first sub-heat-conducting elements 311. This allows the two first sub-heat-conducting elements 311 to quickly transfer the heat generated in the middle of the main body 221 to the sides of the main body 221, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. Furthermore, the heat from the main body 221 can be further transferred to the third sub-heat-conducting element 313 located on the fifth surface 2215 or the sixth surface 2216, further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0192] In other embodiments, the first heat-conducting element 310 includes a first sub-heat-conducting element 311 and a third sub-heat-conducting element 313. The first sub-heat-conducting element 311 is disposed on the first surface 2211 or the second surface 2212, and the third sub-heat-conducting element 313 is disposed on the fifth surface 2215 or the sixth surface 2216. The first sub-heat-conducting element 311 and the third sub-heat-conducting element 313 are connected. This allows the first sub-heat-conducting element 311 to quickly transfer heat generated in the middle of the main body 221 to the sides of the main body 221, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. Furthermore, the heat from the main body 221 can be further transferred to the third sub-heat-conducting element 313 located on the fifth surface 2215 or the sixth surface 2216, further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0193] Please refer to Figure 12, which is a perspective view of a portion of the structure of a battery device provided in some other embodiments of this application.

[0194] In some embodiments, the through hole 314 is a strip-shaped hole that extends along the third direction Z, which enables the heat of the first sub-heat conductor 311 to be quickly conducted to the third sub-heat conductor 313 along the third direction Z, thereby improving the heat conduction efficiency of the first heat conductor 310.

[0195] In some embodiments, the number of through holes 314 is multiple, and the multiple through holes 314 are spaced apart along the second direction Y, which can further reduce the weight of the battery cell 20.

[0196] Please refer to Figures 13 and 14. Figure 13 is a perspective view of a partial structure of a battery device provided in some other embodiments of this application; Figure 14 is a perspective view of a partial structure of a battery device provided in some other embodiments of this application.

[0197] In some embodiments, the first heat-conducting element 310 includes two first sub-heat-conducting elements 311, two second sub-heat-conducting elements 312, and two third sub-heat-conducting elements 313. The two first sub-heat-conducting elements 311 are respectively disposed on the first surface 2211 and the second surface 2212. The two second sub-heat-conducting elements 312 are respectively disposed on the third surface 2213 and the fourth surface 2214. The two third sub-heat-conducting elements 313 are respectively disposed on the fifth surface 2215 and the sixth surface 2216. Each second sub-heat-conducting element 312 is connected to the two first sub-heat-conducting elements 311, and each third sub-heat-conducting element 313 is connected to the two first sub-heat-conducting elements 311 and the two second sub-heat-conducting elements 312. The two first sub-heat conductors 311 can quickly transfer the heat generated in the middle of the main body 221 to the sides of the main body 221, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20; the heat generated by the tab 222 can be quickly transferred to other parts through the second sub-heat conductor 312 located on the fourth surface 2214, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20; the heat of the main body 221 can be further transferred to the second sub-heat conductor 312 and the two third sub-heat conductors 313 located on the fourth surface 2214, further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0198] In some embodiments, the second sub-heat conductor 312 is connected to the third sub-heat conductor 313.

[0199] In some embodiments, the second sub-heat conductor 312 and the third sub-heat conductor 313 can be integrally formed. This makes the overall structure of the first heat conductor 310 more stable.

[0200] In other embodiments, the second sub-heat conductor 312 and the third sub-heat conductor 313 can be bonded together, heat-fused together, etc.

[0201] In some embodiments, the battery cell 20 includes a plurality of electrode assemblies 220, which are arranged along a first direction X, which is parallel to the thickness direction of the electrode assembly 220, and at least a portion of the first heat-conducting element 310 is disposed between two adjacent electrode assemblies 220.

[0202] Since more heat is more easily generated between two adjacent electrode assemblies 220, by disposing at least a portion of the first heat-conducting element 310 between two adjacent electrode assemblies 220, the heat between the two adjacent electrode assemblies 220 can be discharged through the first heat-conducting element 310, thereby making the thermal management component more efficient in managing the thermal of the electrode assemblies 220 and reducing the possibility of temperature runaway in the battery device 100.

[0203] Referring to Figure 13, in some embodiments, a first heat-conducting element 310 is provided, and the first heat-conducting element 310 covers a plurality of electrode assemblies 220.

[0204] Referring to Figure 9, in some embodiments, multiple first heat-conducting elements 310 are provided, and multiple first heat-conducting elements 310 are provided in a one-to-one correspondence with multiple electrode assemblies 220.

[0205] By providing multiple first heat-conducting elements 310, and each of the multiple first heat-conducting elements 310 corresponding to a multiple electrode assembly 220, each electrode assembly 220 can conduct heat through the first heat-conducting element 310, thereby reducing the temperature gradient between different parts of the battery cell 20, which is beneficial to improving the service life of the battery cell 20 and reducing the possibility of temperature runaway of the battery device 100.

[0206] Please refer to Figure 15, which is a cross-sectional schematic diagram of a portion of the structure of a battery device provided in some other embodiments of this application.

[0207] In some embodiments, a plurality of first heat-conducting elements 310 are connected end to end along a first direction X.

[0208] By connecting multiple first heat-conducting elements 310 end to end along the first direction X, the heat of multiple electrode assemblies 220 can be conducted to each other through the multiple first heat-conducting elements 310, thereby reducing the temperature gradient between different parts of the battery cell 20, which is beneficial to improving the service life of the battery cell 20 and reducing the possibility of temperature runaway of the battery device 100.

[0209] For example, in some embodiments, the battery cell 20 includes a first electrode assembly 220a, a second electrode assembly 220b, and a third electrode assembly 220c arranged sequentially along a first direction X. The first heat-conducting element 310 corresponding to the first electrode assembly 220a includes two first sub-heat-conducting elements 311 disposed on a first surface 2211 and a second surface 2212 of the main body 221, and a third sub-heat-conducting element 313 disposed on a sixth surface 2216 of the main body 221, with the third sub-heat-conducting element 313 connecting the two first sub-heat-conducting elements 311. The first heat-conducting element 310 corresponding to the second electrode assembly 220b includes a first sub-heat-conducting element 311 disposed on the second surface 2212 of the main body 221, and a third sub-heat-conducting element 313 disposed on a fifth surface 2215 of the main body 221, and is located on the second electrode assembly. The third sub-heat conductor 313 of the fifth surface 2215 of 220b is connected to the first sub-heat conductor 311 located on the second surface 2212 of the first electrode assembly 220a and the first sub-heat conductor 311 located on the second surface 2212 of the second electrode assembly 220b; the first heat conductor 310 of the corresponding third electrode assembly 220c includes the first sub-heat conductor 311 disposed on the second surface 2212 of the main body 221 and the third sub-heat conductor 313 disposed on the sixth surface 2216 of the main body 221, and the third sub-heat conductor 313 located on the sixth surface 2216 of the third electrode assembly 220c is connected to the first sub-heat conductor 311 located on the second surface 2211 of the second electrode assembly 220b and the first sub-heat conductor 311 located on the second surface 2211 of the third electrode assembly 220c.

[0210] Please refer to Figure 16, which is a cross-sectional schematic diagram of a portion of the structure of a battery device provided in some other embodiments of this application.

[0211] In some embodiments, the battery cell 20 includes an electrode assembly 220. This allows the heat generated by the electrode assembly 220 to be quickly dissipated through the first heat-conducting element 310 and the housing 210, resulting in better heat dissipation of the battery cell 20 and reducing the possibility of temperature runaway in the battery device 100.

[0212] Please refer to Figure 17, which is an exploded view of a portion of the battery structure provided in some other embodiments of this application.

[0213] In some embodiments, the outer casing 210 includes a main casing 210a (composed of a first wall 211, a second wall 212, a third wall 213, a fifth wall 215, and a sixth wall 216) and an end cap 210b (i.e., a fourth wall 214). The main casing 210a is a hollow structure with an opening on one side, and the end cap 210b is plate-shaped, closing the opening of the main casing 210a. Here, "closing" refers to covering or shutting off, and can be either sealed or unsealed.

[0214] The main housing 210a can have various shapes, such as cylindrical or cuboid. The main housing 210a can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The end cap 210b can be shaped to match the main housing 210a. For example, if the main housing 210a is a cuboid, the end cap 210b can be a rectangular plate structure that matches it; or, if the main housing 210a is a cylinder, the end cap 210b can be a circular plate structure that matches it. The end cap 210b can also be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The end cap 210b and the main housing 210a can be made of the same or different materials.

[0215] In an embodiment where the main housing 210a has an opening at one end, one end cap 210b may be provided. In an embodiment where the main housing 210a has openings at opposite ends, two end caps 210b may be provided, with the two end caps 210b respectively closing the two openings of the main housing 210a, and the two end caps 210b and the main housing 210a together defining the receiving space.

[0216] In some embodiments, the main housing 210a and the end cap 210b can be connected by welding.

[0217] In other embodiments, the main housing 210a and the end cap 210b can also be fixedly connected by means of bonding, interference fit, etc.

[0218] In other embodiments, both the main housing 210a and the end cap 210b can be hollow structures with an opening on one side, and the opening side of the end cap 210b covers the opening side of the main housing 210a to jointly form an accommodating space.

[0219] In some embodiments, the housing 210 may be made of aluminum, aluminum alloy or other metal materials, which can enable the battery cell 20 to have higher stress performance.

[0220] Please refer to Figures 17 and 18. Figure 18 is a cross-sectional schematic diagram of a portion of the battery structure provided in some other embodiments of this application.

[0221] In some embodiments, the thermal conductive element includes a second thermal conductive element 320 disposed outside the housing 210, and at least a portion of the second thermal conductive element 320 is located between the housing 210 and the thermal management component.

[0222] By placing the second heat conductor 320 outside the housing 210, and with at least a portion of the second heat conductor 320 located between the housing 210 and the thermal management component, the second heat conductor 320 is closer to the thermal management component, and the heat transfer between the second heat conductor 320 and the thermal management component is faster, which helps to further reduce the possibility of temperature runaway of the battery device 100.

[0223] In some embodiments, the second thermal conductive element 320 is bonded to the housing 210 and / or the thermal management component.

[0224] By bonding the second thermal conductive element 320 to the housing 210 and / or the thermal management component, the possibility of displacement of the second thermal conductive element 320 relative to the housing 210 and / or the thermal management component is reduced, so that the second thermal conductive element 320 maintains thermal conductivity to the electrode assembly 220, and the overall structural stability of the battery device 100 is higher.

[0225] In some embodiments, the second thermal conductive element 320 can be bonded to the housing 210 and / or the thermal management component by thermally conductive adhesive, so that heat can be quickly conducted through the thermally conductive adhesive, which is beneficial to improving the heat exchange efficiency between the battery cell 20 and the thermal management component.

[0226] In some embodiments, the second heat-conducting element 320 is disposed on at least a portion of the wall of the housing 210.

[0227] By disposing the second heat-conducting element 320 on at least a portion of the wall of the housing 210, the heat transfer between the battery cell 20 and the second heat-conducting element 320 can be faster, the thermal management component can achieve higher thermal management efficiency for the battery cell 20, and the possibility of temperature runaway in the battery device 100 is lower.

[0228] In some embodiments, the housing 210 includes a first wall 211 and a second wall 212 disposed opposite to each other along a first direction X, the first direction X being parallel to the thickness direction of the housing 210, and the second heat-conducting member 320 includes a first heat-conducting portion 321 disposed on the first wall 211 and / or the second wall 212.

[0229] Since the battery cell 20 generates a lot of heat in the middle during operation, the second heat-conducting element 320 includes a first heat-conducting part 321, which is disposed on the first wall 211 and / or the second wall 212. This allows the first heat-conducting part 321 to quickly conduct the heat generated in the middle of the battery cell 20, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0230] In some embodiments, the first wall 211 is disposed opposite to the first surface 2211, that is, along the first direction X, the projections of the first wall 211 and the first surface 2211 at least partially overlap; the second wall 212 is disposed opposite to the second surface 2212, that is, along the first direction X, the projections of the second wall 212 and the second surface 2212 at least partially overlap. This allows the first surface 2211 and / or the second surface 2212 to conduct heat from the electrode assembly 220 to the housing 210, and then the first wall 211 and / or the second wall 212 can quickly conduct heat from the housing 210 to the thermal management component. This results in faster thermal management and higher thermal management efficiency, which helps reduce the possibility of temperature runaway in the battery device 100 and improves the service life of the battery device 100.

[0231] In some embodiments, the second heat-conducting element 320 includes a first heat-conducting portion 321, which is disposed on the first wall 211 or the second wall 212. This allows the first heat-conducting portion 321 to quickly conduct heat generated in the middle of the battery cell 20 through the first wall 211 or the second wall 212, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0232] In some embodiments, the second heat-conducting element 320 includes two first heat-conducting portions 321, which are respectively disposed on the first wall 211 and the second wall 212. This allows the two first heat-conducting portions 321 to quickly dissipate heat generated in the middle of the battery cell 20 through the first wall 211 and the second wall 212, thereby further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0233] In some embodiments, the first wall 211 and / or the second wall 212 are the walls with the largest area of ​​the outer casing 210.

[0234] By making the first wall 211 and / or the second wall 212 the walls with the largest area of ​​the outer casing 210, the area for heat exchange between the second heat-conducting element 320 and the battery cell 20 can be larger, thereby increasing the heat exchange rate and reducing the possibility of temperature runaway in the battery device 100.

[0235] In some embodiments, the housing 210 further includes a third wall 213 and a fourth wall 214 disposed opposite each other along a second direction Y, the second direction Y being perpendicular to the first direction X. The battery cell 20 further includes an electrode terminal 230 electrically connected to the electrode assembly 220, the electrode terminal 230 being disposed on the third wall 213 and / or the fourth wall 214; the second heat-conducting element 320 further includes a second heat-conducting portion 322, the second heat-conducting portion 322 being disposed on the third wall 213 and / or the fourth wall 214.

[0236] Electrode terminal 230 is used for electrical connection with tab 222 of electrode assembly 220 to input or output electrical energy of battery cell 20. Electrode terminal 230 and tab 222 can be directly connected, for example, by soldering electrode terminal 230 to tab 222. Electrode terminal 230 and tab 222 can also be indirectly connected, for example, through a current collector. The current collector can be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy.

[0237] Since the portion of the battery cell 20 where the electrode terminal 230 is located generates a high amount of heat during operation, the second heat-conducting element 320 further includes a second heat-conducting part 322. The second heat-conducting part 322 is disposed on the third wall 213 and / or the fourth wall 214, so that the second heat-conducting part 322 can quickly conduct heat away from the portion where the electrode terminal 230 is located, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0238] In some embodiments, the third wall 213 is disposed opposite to the third surface 2213, that is, along the second direction Y, the projections of the third wall 213 and the third surface 2213 at least partially overlap; the fourth wall 214 is disposed opposite to the fourth surface 2214, that is, along the second direction Y, the projections of the fourth wall 214 and the fourth surface 2214 at least partially overlap. This allows the third surface 2213 and / or the fourth surface 2214 to conduct heat from the electrode assembly 220 to the housing 210, and then the third wall 213 and / or the fourth wall 214 can quickly conduct heat from the housing 210 to the thermal management component. This results in faster thermal management and higher thermal management efficiency, which helps reduce the possibility of temperature runaway in the battery device 100 and improves the service life of the battery device 100.

[0239] In some embodiments, the first heat-conducting part 321 is connected to the second heat-conducting part 322.

[0240] By connecting the first heat-conducting part 321 and the second heat-conducting part 322, heat can be transferred between the first heat-conducting part 321 and the second heat-conducting part 322, which can further reduce the temperature gradient between different parts of the battery cell 20 and help to further improve the service life of the battery cell 20.

[0241] In some embodiments, the first heat-conducting part 321 and the second heat-conducting part 322 can be integrally formed. This makes the overall structure of the second heat-conducting part 320 more stable.

[0242] In other embodiments, the first heat-conducting part 321 and the second heat-conducting part 322 can be bonded together, heat-fused together, etc.

[0243] In some embodiments, the second heat-conducting element 320 includes two first heat-conducting portions 321 and two second heat-conducting portions 322. The two first heat-conducting portions 321 are respectively disposed on the first wall 211 and the second wall 212, and the two second heat-conducting portions 322 are respectively disposed on the third wall 213 and the fourth wall 214. Each second heat-conducting portion 322 connects to the two first heat-conducting portions 321. This allows the two first heat-conducting portions 321 to quickly transfer the heat generated in the middle of the battery cell 20 to the sides of the battery cell 20, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. It also allows the heat generated in the electrode terminals 230 to be quickly transferred to other parts through the second heat-conducting portions 322 located on the fourth wall 214, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. Furthermore, it allows the heat from the battery cell 20 to be further transferred to the second heat-conducting portions 322 located on the third wall 213, further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0244] In other embodiments, the second heat-conducting element 320 includes two first heat-conducting parts 321 and one second heat-conducting part 322. The two first heat-conducting parts 321 are respectively disposed on the first wall 211 and the second wall 212, and the second heat-conducting part 322 is disposed on the third wall 213. The second heat-conducting part 322 connects the two first heat-conducting parts 321. This allows the two first heat-conducting parts 321 to quickly transfer the heat generated in the middle of the battery cell 20 to the sides of the battery cell 20, thereby reducing the temperature gradient between the heat-conducting parts of the battery cell 20 and improving the service life of the battery cell 20. Furthermore, the heat from the battery cell 20 can be further transferred to the second heat-conducting part 322 located on the third wall 213, further reducing the temperature gradient between the heat-conducting parts of the battery cell 20 and improving the service life of the battery cell 20.

[0245] In other embodiments, the second heat-conducting element 320 includes two first heat-conducting parts 321 and one second heat-conducting part 322. The two first heat-conducting parts 321 are respectively disposed on the first wall 211 and the second wall 212, and the second heat-conducting part 322 is disposed on the fourth wall 214, connecting the two first heat-conducting parts 321. This allows the two first heat-conducting parts 321 to quickly transfer the heat generated in the middle of the battery cell 20 to the sides of the battery cell 20, and allows the heat generated by the tab 222 to be quickly transferred to other heat-conducting parts through the second heat-conducting part 322 located on the fourth wall 214. This reduces the temperature gradient between the heat-conducting parts of the battery cell 20, which is beneficial to improving the service life of the battery cell 20.

[0246] In other embodiments, the first heat-conducting element 310 includes a first heat-conducting part 321 and a second heat-conducting part 322. The first heat-conducting part 321 is disposed on the first wall 211 or the second wall 212, and the second heat-conducting part 322 is disposed on the third wall 213 or the fourth wall 214. The first heat-conducting part 321 and the second heat-conducting part 322 are connected. This allows the two first heat-conducting parts 321 to quickly transfer the heat generated in the middle of the battery cell 20 to the sides of the battery cell 20. Similarly, the heat generated by the tab 222 can be quickly transferred to other heat-conducting parts through the second heat-conducting part 322 located on the fourth wall 214, or the heat from the battery cell 20 can be further transferred to the second heat-conducting part 322 located on the third wall 213. This reduces the temperature gradient between the heat-conducting parts of the battery cell 20, which is beneficial for improving the service life of the battery cell 20.

[0247] In some embodiments, the electrode terminal 230 includes a positive terminal 231 and a negative terminal 232, which are spaced apart on the fourth wall 214. At least a portion of the second heat-conducting portion 322 is disposed between the positive terminal 231 and the negative terminal 232.

[0248] By disposing at least a portion of the second heat-conducting part 322 between the positive terminal 231 and the negative terminal 232, the second heat-conducting part 322 can quickly dissipate the heat from the portions where the positive terminal 231 and the negative terminal 232 are located, thereby reducing the temperature gradient between the various parts of the battery cell 20 and improving the service life of the battery cell 20.

[0249] In some embodiments, the housing 210 further includes a fifth wall 215 and a sixth wall 216 disposed opposite each other along a third direction Z, the third direction Z being perpendicular to the first direction X. The second heat-conducting member 320 further includes a third heat-conducting portion 323 disposed on the fifth wall 215 and / or the sixth wall 216.

[0250] Among them, the fifth wall 215 and the sixth wall 216 are not provided with electrode terminals 230.

[0251] By including a third heat-conducting part 323 in the second heat-conducting element 320, the third heat-conducting part 323 is disposed on the fifth wall 215 and / or the sixth wall 216, so that the third heat-conducting part 323 can quickly conduct the heat generated by the battery cell 20, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0252] In some embodiments, the fifth wall 215 is disposed opposite to the fifth surface 2215, i.e., along the third direction Z, the projections of the fifth wall 215 and the fifth surface 2215 at least partially overlap; the sixth wall 216 is disposed opposite to the sixth surface 2216, i.e., along the third direction Z, the projections of the sixth wall 216 and the sixth surface 2216 at least partially overlap. This allows the fifth surface 2215 and / or the sixth surface 2216 to conduct heat from the electrode assembly 220 to the housing 210, and then the fifth wall 215 and / or the sixth wall 216 can quickly conduct heat from the housing 210 to the thermal management component. This results in faster thermal management and higher thermal management efficiency, which helps reduce the possibility of temperature runaway in the battery device 100 and improves the service life of the battery device 100.

[0253] In some embodiments, the first heat-conducting part 321 is connected to the third heat-conducting part 323.

[0254] By connecting the first heat-conducting part 321 and the third heat-conducting part 323, heat can be transferred between the first heat-conducting part 321 and the third heat-conducting part 323, which can further reduce the temperature gradient between different parts of the battery cell 20 and help to further improve the service life of the battery cell 20.

[0255] In some embodiments, the first heat-conducting part 321 and the third heat-conducting part 323 can be integrally formed. This makes the overall structure of the second heat-conducting element 320 more stable.

[0256] In other embodiments, the first heat-conducting part 321 and the third heat-conducting part 323 can be bonded together, heat-fused together, etc.

[0257] Referring to Figures 17 and 18, in some embodiments, the second heat-conducting element 320 includes two first heat-conducting portions 321 and two third heat-conducting portions 323. The two first heat-conducting portions 321 are respectively disposed on the first wall 211 and the second wall 212, and the two third heat-conducting portions 323 are respectively disposed on the fifth wall 215 and the sixth wall 216. Each third heat-conducting portion 323 connects to the two first heat-conducting portions 321. This allows the two first heat-conducting portions 321 to quickly transfer the heat generated in the middle of the battery cell 20 to the sides of the battery cell 20, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. Furthermore, the heat from the battery cell 20 can be further transferred to the two third heat-conducting portions 323, further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0258] In other embodiments, the second heat-conducting element 320 includes two first heat-conducting parts 321 and one third heat-conducting part 323. The two first heat-conducting parts 321 are respectively disposed on the first wall 211 and the second wall 212, and the third heat-conducting part 323 is disposed on the fifth wall 215 or the sixth wall 216. The third heat-conducting part 323 connects the two first heat-conducting parts 321. This allows the two first heat-conducting parts 321 to quickly transfer the heat generated in the middle of the battery cell 20 to the sides of the battery cell 20, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. Furthermore, the heat from the battery cell 20 can be further transferred to the third heat-conducting part 323 located on the fifth wall 215 or the sixth wall 216, further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0259] In other embodiments, the second heat-conducting element 320 includes a first heat-conducting part 321 and a third heat-conducting part 323. The first heat-conducting part 321 is disposed on the first wall 211 or the second wall 212, and the third heat-conducting part 323 is disposed on the fifth wall 215 or the sixth wall 216. The first heat-conducting part 321 and the third heat-conducting part 323 are connected. This allows the first heat-conducting part 321 to quickly transfer the heat generated in the middle of the battery cell 20 to the sides of the battery cell 20, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. Furthermore, the heat from the battery cell 20 can be further transferred to the third heat-conducting part 323 located on the fifth wall 215 or the sixth wall 216, further reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0260] In some other embodiments, the second heat-conducting element 320 includes two first heat-conducting parts 321, two second heat-conducting parts 322, and two third heat-conducting parts 323. The two first heat-conducting parts 321 are respectively disposed on the first wall 211 and the second wall 212, the two second heat-conducting parts 322 are respectively disposed on the third wall 213 and the fourth wall 214, and the two third heat-conducting parts 323 are respectively disposed on the fifth wall 215 and the sixth wall 216. Each second heat-conducting part 322 is connected to the two first heat-conducting parts 321, and each third sub-heat-conducting element 313 is connected to the two first heat-conducting parts 321 and the two second heat-conducting parts 322. The two first heat-conducting parts 321 can quickly transfer the heat generated in the middle of the battery cell 20 to the sides of the battery cell 20, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. The heat generated in the electrode terminal 230 can be quickly transferred to other parts through the second heat-conducting part 322 located on the fourth wall 214, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20. The heat of the battery cell 20 can be further transferred to the second heat-conducting part 322 and the two third heat-conducting parts 323 located on the fourth wall 214, which can further reduce the temperature gradient between different parts of the battery cell 20 and improve the service life of the battery cell 20.

[0261] In some embodiments, the second heat-conducting part 322 is connected to the third heat-conducting part 323.

[0262] In some embodiments, the second heat-conducting part 322 and the third heat-conducting part 323 can be integrally formed. This makes the overall structure of the second heat-conducting element 320 more stable.

[0263] In other embodiments, the second heat-conducting part 322 and the third heat-conducting part 323 can be bonded together, heat-fused together, etc.

[0264] Please refer to Figure 19, which is a three-dimensional structural schematic diagram of a battery device provided in some other embodiments of this application.

[0265] In some embodiments, the battery device 100 includes a plurality of battery cells 20, a plurality of electrode cells arranged along a first direction X, the first direction X being parallel to the thickness direction of the battery cells 20, and at least a portion of a second heat-conducting member 320 disposed between two adjacent battery cells 20.

[0266] Since more heat is more easily generated between two adjacent battery cells 20, by disposing at least a portion of the second heat-conducting element 320 between two adjacent battery cells 20, the heat between the two adjacent battery cells 20 can be dissipated through the second heat-conducting element 320, thereby making the thermal management component more efficient in managing the thermal of the battery cells 20 and reducing the possibility of temperature runaway in the battery device 100.

[0267] In some embodiments, multiple second heat-conducting elements 320 are provided, and each of the multiple second heat-conducting elements 320 corresponds to a multiple battery cell 20.

[0268] By providing multiple second heat-conducting elements 320, with each second heat-conducting element 320 corresponding to a multiple battery cell 20, each battery cell 20 can dissipate heat through the second heat-conducting element 320. This reduces the temperature gradient between different parts of the battery device 100, which helps to improve the service life of the battery device 100 and reduces the possibility of temperature runaway in the battery device 100.

[0269] In other embodiments, only one second heat-conducting element 320 may be provided, and the second heat-conducting element 320 may cover multiple battery cells 20.

[0270] Please refer to Figure 20, which is a schematic diagram from one perspective of a partial structure of a battery device provided in some other embodiments of this application.

[0271] In some embodiments, a plurality of second heat-conducting elements 320 are connected end to end along a first direction X.

[0272] By connecting multiple second heat-conducting elements 320 end to end along the first direction X, the heat of multiple battery cells 20 can be conducted to each other through the multiple second heat-conducting elements 320, thereby reducing the temperature gradient between different parts of the battery device 100, which is beneficial to improving the service life of the battery device 100 and reducing the possibility of temperature runaway of the battery device 100.

[0273] For example, in some embodiments, the battery device 100 includes a first battery cell 20a, a second battery cell 20b, and a third electrode assembly 220c arranged sequentially along a first direction X. A first heat-conducting element 310 corresponding to the first battery cell 20a includes two first heat-conducting portions 321 disposed on a first wall 211 and a second wall 212 of the housing 210, and a third heat-conducting portion 323 disposed on a sixth wall 216 of the housing 210, with the third heat-conducting portion 323 connecting the two first heat-conducting portions 321. A first heat-conducting element 310 corresponding to the second battery cell 20b includes a first heat-conducting portion 321 disposed on a second wall 212 of the housing 210, and a third heat-conducting portion 323 disposed on a fifth wall 215 of the housing 210, and is located on the second battery cell 20b. The third heat-conducting part 323 of the fifth wall 215 of the battery cell 20b is connected to the first heat-conducting part 321 of the second wall 212 of the first battery cell 20a and the first heat-conducting part 321 of the second wall 212 of the second battery cell 20b; the first heat-conducting member 310 corresponding to the third electrode assembly 220c includes the first heat-conducting part 321 of the second wall 212 of the housing 210 and the third heat-conducting part 323 of the sixth wall 216 of the housing 210, and the third heat-conducting part 323 of the sixth wall 216 of the third electrode assembly 220c is connected to the first heat-conducting part 321 of the second surface 2211 of the second battery cell 20b and the first heat-conducting part 321 of the second surface 2211 of the third electrode assembly 220c.

[0274] In some embodiments, the electrode assembly 220 is housed within the housing 210. The main body 221 of the electrode assembly 220 includes a first surface 2211 and a second surface 2212 disposed opposite to each other along a first direction X, a third surface 2213 and a fourth surface 2214 disposed opposite to each other along a second direction Y, and a fifth surface 2215 and a sixth surface 2216 disposed opposite to each other along a third direction Z. The housing 210 includes a first wall 211 and a second wall 212 disposed opposite to each other along a first direction X, a third wall 213 and a fourth wall 214 disposed opposite to each other along a second direction Y, and a fifth wall 215 and a sixth wall 216 disposed opposite to each other along a third direction Z. The first surface 2211 is adjacent to the first wall 211, the second surface 2212 is adjacent to the second wall 212, the third surface 2213 is adjacent to the third wall 213, the fourth surface 2214 is adjacent to the fourth wall 214, the fifth surface 2215 is adjacent to the fifth wall 215, and the sixth surface 2216 is adjacent to the sixth wall 216.

[0275] In some embodiments, the thermal conductive element includes a first thermal conductive element 310 and a second thermal conductive element 320. The first thermal conductive element 310 is disposed inside the housing 210, and at least a portion of the first thermal conductive element 310 is located between the electrode assembly 220 and the housing 210. The second thermal conductive element 320 is disposed outside the housing 210, and at least a portion of the second thermal conductive element 320 is located between the housing 210 and the thermal management component. At least a portion of the first thermal conductive element 310 and the second thermal conductive element 320 are arranged opposite to each other, i.e., along at least one of a first direction X, a second direction Y, and a third direction Z, the projections of the first thermal conductive element 310 and the second thermal conductive element 320 at least partially overlap. This allows the first thermal conductive element 310 to conduct heat from the electrode assembly 220 to the housing 210, and the second thermal conductive element 320 to quickly conduct heat from the housing 210 to the thermal management component. This results in faster and more efficient thermal management, reducing the possibility of temperature runaway in the battery device 100 and improving the lifespan of the battery device 100.

[0276] For example, in some embodiments, the first heat-conducting element 310 includes two first sub-heat-conducting elements 311 and two second sub-heat-conducting elements 312, the two first sub-heat-conducting elements 311 being disposed on the first surface 2211 and the second surface 2212 respectively, and the two second sub-heat-conducting elements 312 being disposed on the third surface 2213 and the fourth surface 2214 respectively; the second heat-conducting element 320 includes two first heat-conducting portions 321 and two second heat-conducting portions 322, the two first heat-conducting portions 321 being disposed on the first wall 211 and the second wall 212 respectively, and the two second heat-conducting portions 322 being disposed on the third wall 213 and the fourth wall 214 respectively. The heat generated by the electrode assembly 220 can be conducted through the two first sub-thermal conductive elements 311 of the first thermal conductive element 310 to the first wall 211 and the second wall 212 of the outer shell 210, and then directly conducted through the first wall 211 and the second wall 212 to the two first thermal conductive parts 321 of the second thermal conductive element 320; the heat generated by the electrode assembly 220 can be conducted through the two second sub-thermal conductive elements 312 of the first thermal conductive element 310 to the third wall 213 and the second wall of the outer shell 210, and then directly conducted through the third wall 213 and the second wall to the two second thermal conductive parts 322 of the second thermal conductive element 320; the heat conduction path is short and the conduction speed is fast.

[0277] In some embodiments, the housing 210 includes a first wall 211 and a second wall 212 disposed opposite to each other along a first direction X, the first direction X being parallel to the thickness direction of the housing 210. Thermal management components are disposed on the first wall 211 and / or the second wall 212.

[0278] Since the battery cell 20 generates a lot of heat in the middle of the body 221 of the electrode assembly 220 during operation, by providing thermal management components on the first wall 211 and / or the second wall 212, the thermal management components can quickly conduct the heat generated in the middle of the battery cell 20, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0279] Referring to Figure 3, in some embodiments, the thermal management component includes a first thermal management component 410, which is disposed on a first wall 211 or a second wall 212.

[0280] In other embodiments, the thermal management component includes two first thermal management components 410, which are respectively disposed on the first wall 211 and the second wall 212. By providing two first thermal management components 410, the two first thermal management components 410 can simultaneously exchange heat with the first wall 211 and the second wall 212 of the casing 210, which can quickly dissipate the heat of the battery cell 20, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0281] In some embodiments, the first wall 211 and / or the second wall 212 are the walls with the largest area of ​​the outer casing 210.

[0282] By making the first wall 211 and / or the second wall 212 the walls with the largest area of ​​the outer casing 210, the area for heat exchange between the thermal management components and the battery cells 20 can be increased, thereby improving the heat exchange rate and reducing the possibility of temperature runaway in the battery device 100.

[0283] In some embodiments, the housing 210 further includes a third wall 213 and a fourth wall 214 disposed opposite each other along the second direction Y, and a fifth wall 215 and a sixth wall 216 disposed opposite each other along the third direction Z, wherein the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. At least one of the third wall 213, the fourth wall 214, the fifth wall 215, and the sixth wall 216 is provided with a thermal management component.

[0284] By providing a thermal management component to at least one of the third wall 213, the fourth wall 214, the fifth wall 215, and the sixth wall 216, the thermal management component can quickly dissipate the heat generated by the battery cell 20, thereby reducing the temperature gradient between different parts of the battery cell 20 and improving the service life of the battery cell 20.

[0285] Referring to Figure 19, in some embodiments, the thermal management component includes a second thermal management component 420, which is disposed on the third wall 213 and / or the fourth wall 214. The second thermal management component 420 can be thermally connected to multiple battery cells 20, making the thermal management efficiency of the thermal management component for multiple battery cells 20 higher, and further reducing the possibility of temperature runaway of the battery device 100.

[0286] Please refer to Figure 21, which is a three-dimensional structural schematic diagram of a battery device provided in some other embodiments of this application.

[0287] In some embodiments, the thermal management component includes a third thermal management component 430, which is disposed on the fifth wall 215 and / or the sixth wall 216. The third thermal management component 430 can be thermally connected to multiple battery cells 20, making the thermal management component more efficient in managing the thermal of multiple battery cells 20, and further reducing the possibility of temperature runaway of the battery device 100.

[0288] In some embodiments, the battery device 100 includes a second thermal conductive element 320, at least a portion of which overlaps with a thermal management component. This allows the second thermal conductive element 320 to quickly conduct heat from the housing 210 to the thermal management component, resulting in faster and more efficient thermal management. This helps reduce the possibility of temperature runaway in the battery device 100 and improves the lifespan of the battery device 100.

[0289] For example, in some embodiments, the second heat-conducting element 320 includes two first heat-conducting portions 321 and two second heat-conducting portions 322. The two first heat-conducting portions 321 are respectively disposed on the first wall 211 and the second wall 212, and the two second heat-conducting portions 322 are respectively disposed on the third wall 213 and the fourth wall 214. The thermal management component includes two first thermal management components 410 and two second thermal management components 420. The two first thermal management components 410 are respectively disposed on the two first heat-conducting portions 321, and the two second thermal management components 420 are respectively disposed on the two second heat-conducting portions 322. This allows the heat generated by the battery cell 20 to be conducted to the first thermal management component 410 through the two first heat-conducting portions 321 of the second heat-conducting element 320; and allows the heat generated by the battery cell 20 to be conducted to the second thermal management component 420 through the two second heat-conducting portions 322 of the second heat-conducting element 320; the heat conduction path is short and the conduction speed is fast.

[0290] In some embodiments, the thermal conductivity of the heat-conducting element is greater than or equal to 500 W / (m·K). For example, the thermal conductivity of the heat-conducting element can be 500 W / (m·K), 800 W / (m·K), or 1000 W / (m·K), etc.

[0291] By making the thermal conductivity of the heat-conducting component greater than or equal to 500 W / (m·K), the heat conduction efficiency of the heat-conducting component can be made higher and the heat conduction effect can be better. This is beneficial to improving the thermal management efficiency of the thermal management component for the battery cell 20, thereby reducing the possibility of temperature runaway of the battery device 100.

[0292] In some embodiments, the material of the heat-conducting component includes at least one of graphite, graphene, and carbon nanotubes. The graphite may be supercrystalline graphite.

[0293] By including at least one of graphite, graphene, and carbon nanotubes in the material of the heat-conducting component, the heat conduction efficiency of the heat-conducting component can be improved and the heat conduction effect can be better. This is beneficial to improving the thermal management efficiency of the thermal management component for the battery cell 20, thereby reducing the possibility of temperature runaway of the battery device 100.

[0294] In some embodiments, an insulating layer (not shown) is provided on the surface of the heat-conducting element.

[0295] By providing an insulating layer on the surface of the heat-conducting component, the insulation performance of the heat-conducting component can be improved, reducing the possibility of short circuit in the battery cell 20, thereby reducing the possibility of temperature runaway in the battery device 100.

[0296] In some embodiments, the insulating layer is made of at least one of polyethylene, polypropylene, polyimide, or polyester resin. This improves the insulation effect of the insulating layer, enhances the insulation performance of the thermally conductive component, and further reduces the possibility of short circuits in the battery cell 20.

[0297] Some embodiments of this application provide an electrical device, including the battery device 100 described in any of the above embodiments, the battery device 100 being used to provide electrical energy.

[0298] The electrical device can be any of the aforementioned systems or devices that use battery device 100.

[0299] Referring to Figures 3 to 5, some embodiments of this application provide a battery device 100, including a battery cell 20, a heat-conducting element, and a thermal management component. The battery cell 20 includes a housing 210 and an electrode assembly 220, with the electrode assembly 220 housed within the housing 210. The heat-conducting element is thermally connected to the housing 210, and the thermal conductivity of the heat-conducting element is greater than that of the housing 210. The thermal management component has a receiving cavity for containing a heat exchange medium. The thermal management component is thermally connected to the electrode assembly 220 via the housing 210 and the heat-conducting element, enabling heat exchange between the heat exchange medium and the electrode assembly 220.

[0300] In some embodiments, the thermal conductive element includes a first thermal conductive element 310 disposed inside the housing 210, and at least a portion of the first thermal conductive element 310 is located between the electrode assembly 220 and the housing 210.

[0301] In some embodiments, the electrode assembly 220 includes a body 221 and a tab 222. The tab 222 is connected to the body 221. The body 221 includes a first surface 2211 and a second surface 2212 disposed opposite each other along a first direction X, a third surface 2213 and a fourth surface 2214 disposed opposite each other along a second direction Y, and a fifth surface 2215 and a sixth surface 2216 disposed opposite each other along a third direction Z. The first direction X is parallel to the thickness direction of the body 221. The tab 222 is disposed on the fourth surface 2214. The battery cell 20 also includes an electrode terminal 230 disposed on the housing 210 and electrically connected to the tab 222.

[0302] Referring to Figures 13 and 14, the first heat-conducting element 310 includes two first sub-heat-conducting elements 311, two second sub-heat-conducting elements 312, and two third sub-heat-conducting elements 313. The two first sub-heat-conducting elements 311 are respectively disposed on the first surface 2211 and the second surface 2212. The two second sub-heat-conducting elements 312 are respectively disposed on the third surface 2213 and the fourth surface 2214. The two third sub-heat-conducting elements 313 are respectively disposed on the fifth surface 2215 and the sixth surface 2216. Each second sub-heat-conducting element 312 is connected to two first sub-heat-conducting elements 311, and each third sub-heat-conducting element 313 is connected to two first sub-heat-conducting elements 311 and two second sub-heat-conducting elements 312.

[0303] In some embodiments, the tab 222 includes a positive tab 2221 and a negative tab 2222, which are spaced apart on the fourth surface 2214. A second sub-heat conductor 312 is disposed between the positive tab 2221 and the negative tab 2222.

[0304] In some embodiments, the first sub-heat conductor 311 and the second sub-heat conductor 312 are provided with through holes 314, which are strip-shaped holes that extend along the second direction Y or the third direction Z.

[0305] In some embodiments, the battery cell 20 includes a plurality of electrode assemblies 220 arranged along a first direction X, which is parallel to the thickness direction of the electrode assemblies 220. At least a portion of a first thermal conductive element 310 is disposed between two adjacent electrode assemblies 220. A plurality of first thermal conductive elements 310 are provided, and each of the plurality of first thermal conductive elements 310 corresponds to one of the plurality of electrode assemblies 220.

[0306] Referring to Figures 17 and 18, in some embodiments, the heat conductor includes a second heat conductor 320 disposed outside the housing 210, and at least a portion of the second heat conductor 320 is located between the housing 210 and the thermal management component.

[0307] In some embodiments, the housing 210 includes a first wall 211 and a second wall 212 disposed opposite each other along a first direction X, a third wall 213 and a fourth wall 214 disposed opposite each other along a second direction Y, and a fifth wall 215 and a sixth wall 216 disposed opposite each other along a third direction Z. The electrode terminal 230 is disposed on the fourth wall 214. The second heat-conducting element 320 includes a first heat-conducting portion 321 and a third heat-conducting portion 323. The first heat-conducting portion 321 is disposed on the first wall 211 and / or the second wall 212, and the third heat-conducting portion 323 is disposed on the fifth wall 215 and / or the sixth wall 216. Each third sub-heat-conducting element 313 connects to two first heat-conducting portions 321.

[0308] Referring to Figure 19, in some embodiments, the battery device 100 includes a plurality of battery cells 20, and a plurality of electrode cells are arranged along a first direction X, which is parallel to the thickness direction of the battery cells 20. At least a portion of a second heat-conducting element 320 is disposed between two adjacent battery cells 20. A plurality of second heat-conducting elements 320 are provided, and each of the plurality of second heat-conducting elements 320 corresponds to one of the plurality of battery cells 20.

[0309] Referring to Figure 3, in some embodiments, a first thermal management component 410 is provided on the first wall 211 and / or the second wall 212.

[0310] Please refer to Figure 19. A second thermal management component 420 is provided on the third wall 213 and / or the fourth wall 214.

[0311] Please refer to Figure 21. A third thermal management component 430 is provided on the fifth wall 215 and / or the sixth wall 216.

[0312] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0313] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: A battery cell includes a housing and an electrode assembly, wherein the electrode assembly is housed within the housing; A heat-conducting component is thermally connected to the outer casing, and the thermal conductivity of the heat-conducting component is greater than that of the outer casing; A thermal management component has a receiving cavity for containing a heat exchange medium. The thermal management component is thermally connected to the electrode assembly via the housing and the thermally conductive element to enable heat exchange between the heat exchange medium and the electrode assembly.

2. The battery device according to claim 1, characterized in that, The thermal conductive element includes a first thermal conductive element disposed inside the housing, and at least a portion of the first thermal conductive element is located between the electrode assembly and the housing.

3. The battery device according to claim 2, characterized in that, The first thermally conductive element is bonded to the electrode assembly and / or the housing.

4. The battery device according to claim 2 or 3, characterized in that, The electrode assembly includes a body and a tab, the tab being connected to the body. The battery cell also includes an electrode terminal, which is disposed on the housing and electrically connected to the tab. The first heat-conducting element is disposed on at least a portion of the surface of the body.

5. The battery device according to claim 4, characterized in that, The main body includes a first surface and a second surface disposed opposite to each other along a first direction, the first direction being parallel to the thickness direction of the main body, and the first heat-conducting element includes a first sub-heat-conducting element disposed on the first surface and / or the second surface.

6. The battery device according to claim 5, characterized in that, The first surface and / or the second surface is the surface with the largest area of ​​the electrode assembly.

7. The battery device according to claim 5 or 6, characterized in that, The main body further includes a third surface and a fourth surface disposed opposite to each other along a second direction, the second direction being perpendicular to the first direction; The electrode tab is disposed on the third surface and / or the fourth surface; The first heat-conducting element further includes a second sub-heat-conducting element, which is disposed on the third surface and / or the fourth surface.

8. The battery device according to claim 7, characterized in that, The first sub-heat-conducting component is connected to the second sub-heat-conducting component.

9. The battery device according to claim 7 or 8, characterized in that, The electrode tab includes a positive electrode tab and a negative electrode tab, and the positive electrode tab and the negative electrode tab are disposed at intervals on the fourth surface; At least a portion of the second sub-heat-conducting element is disposed between the positive electrode tab and the negative electrode tab.

10. The battery device according to any one of claims 7-9, characterized in that, The first sub-heat-conducting component and / or the second sub-heat-conducting component are provided with through holes.

11. The battery device according to any one of claims 5-10, characterized in that, The main body also includes a fifth surface and a sixth surface disposed opposite to each other along a third direction, the third direction being perpendicular to the first direction; The first heat-conducting element further includes a third sub-heat-conducting element, which is disposed on the fifth surface and / or the sixth surface.

12. The battery device according to claim 11, characterized in that, The first sub-heat-conducting component is connected to the third sub-heat-conducting component.

13. The battery device according to any one of claims 2-12, characterized in that, The battery cell includes a plurality of electrode assemblies, which are arranged along a first direction parallel to the thickness direction of the electrode assemblies. At least a portion of the first thermal conductive element is disposed between two adjacent electrode assemblies.

14. The battery device according to claim 13, characterized in that, Multiple first heat-conducting elements are provided, and each of the multiple first heat-conducting elements corresponds to one of the multiple electrode assemblies.

15. The battery device according to claim 14, characterized in that, Along the first direction, multiple first heat-conducting components are connected end to end.

16. The battery device according to any one of claims 1-15, characterized in that, The thermal conductive element includes a second thermal conductive element disposed outside the housing, and at least a portion of the second thermal conductive element is located between the housing and the thermal management component.

17. The battery device according to claim 16, characterized in that, The second thermally conductive element is bonded to the housing and / or the thermal management component.

18. The battery device according to claim 15 or 16, characterized in that, The second heat-conducting element is disposed on at least a portion of the wall of the housing.

19. The battery device according to claim 18, characterized in that, The outer casing includes a first wall and a second wall disposed opposite to each other along a first direction, the first direction being parallel to the thickness direction of the outer casing. The second heat-conducting element includes a first heat-conducting portion disposed on the first wall and / or the second wall.

20. The battery device according to claim 19, characterized in that, The first wall and / or the second wall are the walls with the largest area of ​​the outer shell.

21. The battery device according to claim 19 or 20, characterized in that, The outer casing further includes a third wall and a fourth wall disposed opposite to each other along a second direction, the second direction being perpendicular to the first direction; The battery cell also includes an electrode terminal, which is electrically connected to the electrode assembly, and the electrode terminal is disposed on the third wall and / or the fourth wall; The second heat-conducting component further includes a second heat-conducting portion disposed on the third wall and / or the fourth wall.

22. The battery device according to claim 21, characterized in that, The first heat-conducting part is connected to the second heat-conducting part.

23. The battery device according to claim 21 or 22, characterized in that, The electrode terminal includes a positive terminal and a negative terminal, which are spaced apart on the fourth wall. At least a portion of the second heat-conducting part is disposed between the positive terminal and the negative terminal.

24. The battery device according to any one of claims 19-23, characterized in that, The outer casing also includes a fifth wall and a sixth wall disposed opposite to each other along a third direction, the third direction being perpendicular to the first direction; The second heat-conducting component further includes a third heat-conducting part, which is disposed on the fifth wall and / or the sixth wall.

25. The battery device according to claim 24, characterized in that, The first heat-conducting part is connected to the third heat-conducting part.

26. The battery device according to any one of claims 16-25, characterized in that, The battery device includes a plurality of battery cells, and the plurality of electrode cells are arranged along a first direction parallel to the thickness direction of the battery cells. At least a portion of the second heat-conducting element is disposed between two adjacent battery cells.

27. The battery device according to claim 26, characterized in that, Multiple second heat-conducting components are provided, and each of the multiple second heat-conducting components corresponds to one of the multiple battery cells.

28. The battery device according to claim 27, characterized in that, Along the first direction, multiple second heat-conducting components are connected end to end.

29. The battery device according to any one of claims 1-28, characterized in that, The outer casing includes a first wall and a second wall disposed opposite to each other along a first direction, the first direction being parallel to the thickness direction of the outer casing; The thermal management component is disposed on the first wall and / or the second wall.

30. The battery device according to claim 29, characterized in that, The first wall and / or the second wall are the walls with the largest area of ​​the outer shell.

31. The battery device according to claim 29 or 30, characterized in that, The outer shell also includes a third wall and a fourth wall arranged opposite to each other along the second direction, and a fifth wall and a sixth wall arranged opposite to each other along the third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; At least one of the third wall, the fourth wall, the fifth wall, and the sixth wall is provided with the thermal management component.

32. The battery device according to claim 1, characterized in that, The heat-conducting component includes a first heat-conducting component and a second heat-conducting component; The first thermal conductive element is disposed inside the housing, and at least a portion of the first thermal conductive element is located between the electrode assembly and the housing; The second thermal conductive element is disposed outside the housing, and at least a portion of the second thermal conductive element is located between the housing and the thermal management component; The first heat-conducting element and the second heat-conducting element are arranged opposite each other.

33. The battery device according to any one of claims 1-32, characterized in that, The thermal conductivity of the heat-conducting component is greater than or equal to 500 W / (m·K).

34. The battery device according to any one of claims 1-33, characterized in that, The material of the heat-conducting component includes at least one of graphite, graphene, and carbon nanotubes.

35. The battery device according to any one of claims 1-34, characterized in that, An insulating layer is provided on the surface of the heat-conducting component.

36. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1 to 35, the battery device being used to provide electrical energy.

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