Battery cell, battery device, and electric device

Abstract

The present application provides a battery cell, a battery device, and an electric device. The battery cell comprises a casing, an electrode assembly, and a thermally conductive assembly. The casing comprises an opening in a first direction. The electrode assembly and the thermally conductive assembly are accommodated in the casing. The thermal conductivity of the thermally conductive assembly is greater than the thermal conductivity of the casing. The casing comprises a thermally conductive wall configured to be connected to a heat exchange mechanism. The casing is easier to exchange heat with the heat exchange mechanism at the thermally conductive wall. The electrode assembly is connected to the thermally conductive wall by means of a thermally conductive portion, so as to facilitate the exchange of heat between the electrode assembly and the heat exchange mechanism. Thus, the rate of heat exchange between an internal environment and an external environment of the battery cell is improved, so as to better balance the temperature of the battery cell, thereby improving the performance of the battery cell and prolonging its service life.

Description

Battery cells, battery packs and electrical devices Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] However, in actual operation, excessively high or low internal temperatures of a battery cell can adversely affect its lifespan and performance. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can enhance the thermal conductivity of the battery cell to balance the internal temperature of the battery cell and improve the performance and service life of the battery cell.

[0005] In a first aspect, this application provides a battery cell, comprising: a housing including an opening in a first direction; an electrode assembly housed within the housing; and a thermally conductive assembly housed within the housing, the thermally conductive assembly including a thermally conductive portion, the thermal conductivity of the thermally conductive assembly being greater than the thermal conductivity of the housing, wherein the housing includes a thermally conductive wall for connection with a heat exchange mechanism, and the thermally conductive portion is connected between the inner surfaces of the electrode assembly and the thermally conductive wall.

[0006] In the embodiments of this application, the battery cell includes a housing, an electrode assembly, and a heat-conducting assembly. The housing includes an opening in a first direction. The electrode assembly and the heat-conducting assembly are housed within the housing. The thermal conductivity of the heat-conducting assembly is greater than that of the housing. The housing includes a heat-conducting wall for connection with a heat exchange mechanism. The housing facilitates heat exchange with the heat exchange mechanism at the heat-conducting wall. The electrode assembly is connected to the heat-conducting wall via a heat-conducting part to facilitate heat exchange between the electrode assembly and the heat exchange mechanism, thereby improving the heat exchange rate between the internal and external environments of the battery cell, better balancing the temperature of the battery cell, and improving the performance and lifespan of the battery cell.

[0007] In some embodiments, multiple electrode assemblies are provided, and the multiple electrode assemblies are stacked along the second direction, with at least a portion of the heat-conducting portion disposed between two adjacent electrode assemblies.

[0008] In the embodiments of this application, multiple electrode components are stacked along the second direction to increase the capacity of the battery cell. The temperature between adjacent electrode components is relatively high. At least some heat-conducting parts are disposed between two adjacent electrode components so that the heat-conducting parts can conduct heat between adjacent electrode components and the casing, thereby better regulating the temperature of the battery cell and improving the performance and service life of the battery cell.

[0009] In some embodiments, a heat-conducting wall is disposed on at least one side of the housing in a third direction, wherein the first direction, the second direction, and the third direction intersect each other, and the heat-conducting portion extends along the third direction and is interconnected with the inner surface of the heat-conducting wall.

[0010] In the embodiments of this application, a heat-conducting wall is disposed on at least one side of the housing in a third direction. The heat-conducting part extends between adjacent electrode components in the third direction and is connected to the heat-conducting wall, so that the heat between adjacent electrode components can be conducted to the heat-conducting wall through the heat-conducting part, and heat exchange can be carried out through the heat-conducting wall and the heat exchange mechanism, so as to improve the heat exchange rate between the internal environment and the external environment of the battery cell, so as to better balance the temperature of the battery cell and improve the performance and service life of the battery cell.

[0011] In some embodiments, two heat-conducting walls are disposed on two sides of the housing in a third direction, and the heat-conducting part extends from both ends of the electrode assembly in a third direction and is connected to the two heat-conducting walls respectively.

[0012] In the embodiment of this application, two heat-conducting walls are respectively disposed on both sides of the housing in the third direction to increase the contact area between the battery cell and the heat exchange mechanism. The heat-conducting part extends from both ends of the electrode assembly in the third direction and is connected to the two heat-conducting walls respectively, so that the heat between adjacent electrode assemblies can be transferred to the two heat-conducting walls through the heat-conducting part and exchanged with the two heat exchange mechanisms respectively, thereby improving the heat exchange rate between the internal and external environments of the battery cell, so as to better balance the temperature of the battery cell and improve the performance and service life of the battery cell.

[0013] In some embodiments, the heat-conducting component further includes an extension portion disposed at one end of the heat-conducting portion, the extension portion being disposed on the inner surface of the heat-conducting wall and extending along a second direction, and the heat-conducting portion being connected to the extension portion to be connected to the heat-conducting wall through the extension portion.

[0014] In the embodiment of this application, the heat-conducting component further includes an extension disposed at one end of the heat-conducting part. The extension is disposed on the inner surface of the heat-conducting wall and extends along the second direction. The heat-conducting part is connected to the heat-conducting wall through the extension. The extension increases the contact area between the heat-conducting component and the heat-conducting wall, thereby improving the heat exchange rate between the heat-conducting component and the heat-conducting wall, so as to better balance the internal temperature of the battery cell and improve the performance and service life of the battery cell.

[0015] In some embodiments, the thermally conductive assembly further includes a first connection portion connected to at least one end of the extension portion in a second direction. The first connection portion is disposed between the housing and the electrode assembly in the second direction, and at least one of the housing and the electrode assembly is connected to the first connection portion.

[0016] In the embodiments of this application, the heat-conducting component further includes a first connecting portion connected to at least one end of the extension in the second direction. The first connecting portion is disposed between the housing and the electrode assembly along the second direction. The first connecting portion is connected to the housing to increase the contact area between the heat-conducting component and the housing, thereby improving the heat exchange rate between the heat-conducting component and the housing. And / or the first connecting portion is connected to the electrode assembly to increase the contact area between the heat-conducting component and the electrode assembly, thereby improving the heat exchange rate between the heat-conducting component and the electrode assembly, so as to better balance the internal temperature of the battery cell and improve the performance and service life of the battery cell.

[0017] In some embodiments, the thermally conductive assembly further includes a second connection portion connected to one end of the extension portion away from the opening in a first direction. The second connection portion is disposed between the housing and the electrode assembly in the first direction, and at least one of the housing and the electrode assembly is connected to the second connection portion.

[0018] In the embodiments of this application, the heat-conducting component further includes a second connecting portion connected to one end of the extension portion away from the opening in a first direction. The second connecting portion is disposed between the housing and the electrode assembly in the first direction. The second connecting portion is connected to the housing to increase the contact area between the heat-conducting component and the housing, thereby improving the heat exchange rate between the heat-conducting component and the housing. And / or the second connecting portion is connected to the electrode assembly to increase the contact area between the heat-conducting component and the electrode assembly, thereby improving the heat exchange rate between the heat-conducting component and the electrode assembly, so as to better balance the internal temperature of the battery cell and improve the performance and service life of the battery cell.

[0019] In some embodiments, a heat-conducting wall is disposed on at least one side of the housing in a second direction, the first direction and the second direction intersect, the heat-conducting portion includes a first segment and a second segment, the first segment is disposed between two adjacent electrode assemblies, the second segment is connected to at least one end of the first segment, and the second segment extends along the second direction between the housing and the electrode assembly and is connected to the heat-conducting wall.

[0020] In the embodiment of this application, a heat-conducting wall is disposed on at least one side of the housing in a second direction. The heat-conducting part includes a first segment and a second segment. The first segment is disposed between two adjacent electrode assemblies, and the second segment is connected to one end of the first segment and connected to the heat-conducting wall. This allows the heat between adjacent electrode assemblies to be conducted to the heat-conducting wall through the heat-conducting part, and heat exchange occurs through the heat-conducting wall and the heat exchange mechanism. This improves the heat exchange rate between the internal and external environments of the battery cell, thereby better balancing the temperature of the battery cell and improving its performance and lifespan.

[0021] In some embodiments, two heat-conducting walls are disposed on both sides of the housing in the second direction, and the second segment is connected to the two heat-conducting walls at both ends in the second direction.

[0022] In the embodiment of this application, two heat-conducting walls are respectively disposed on both sides of the housing in the second direction to increase the contact area between the battery cell and the heat exchange mechanism. The two ends of the second segment are respectively connected to the two heat-conducting walls so that the heat between adjacent electrode components can be transferred to the two heat-conducting walls through the heat-conducting part and exchanged with the two heat exchange mechanisms respectively, thereby improving the heat exchange rate between the internal environment and the external environment of the battery cell, so as to better balance the temperature of the battery cell and improve the performance and service life of the battery cell.

[0023] In some embodiments, the heat-conducting component further includes an extension connected to the end of the second segment in the second direction, the extension being disposed on the heat-conducting wall and extending along the third direction, the heat-conducting component being connected to the heat-conducting wall through the extension, and the first direction, the second direction and the third direction intersecting each other.

[0024] In the embodiment of this application, the heat-conducting component further includes an extension connected to the end of the second segment in the second direction. The extension is disposed on the heat-conducting wall and extends in the third direction. The heat-conducting component is connected to the heat-conducting wall through the extension. The extension increases the contact area between the heat-conducting component and the heat-conducting wall, thereby improving the heat exchange rate between the heat-conducting component and the heat-conducting wall, so as to better balance the internal temperature of the battery cell and improve the performance and service life of the battery cell.

[0025] Thirdly, embodiments of this application provide a battery device, including a housing, a heat exchange mechanism, and a battery cell as described in the first aspect embodiment. The battery cell and the heat exchange mechanism are housed within the housing, and the heat exchange mechanism and the housing are thermally connected.

[0026] In the embodiments of this application, the battery device includes a housing, a heat exchange mechanism, and battery cells. The heat exchange mechanism and battery cells are housed within the housing. The heat exchange mechanism and the housing are thermally connected so that the heat from the electrode assembly can be transferred to the heat exchange mechanism through the heat-conducting components and the housing. The heat exchange mechanism balances the temperature of the battery cells, thereby improving the performance of the battery device.

[0027] In some embodiments, the housing includes a heat-conducting wall, a heat exchange mechanism, and a heat-conducting assembly, which are respectively connected to two sides of the heat-conducting wall in its thickness direction.

[0028] In the embodiment of this application, the heat exchange mechanism and the heat conduction component are respectively connected to the two sides of the heat conduction wall in the thickness direction, so that the heat of the heat conduction component can be transferred to the heat exchange mechanism through the heat conduction wall, thereby improving the temperature regulation effect of the heat exchange mechanism on the battery cells, so as to better balance the temperature of the battery cells and improve the performance of the battery device.

[0029] In some embodiments, the thermal conductivity per unit fluid volume of the heat exchange mechanism is K, satisfying 10 -8 W / (mm 3 ·K)≤K≤10 -4 W / (mm 3 K is directly proportional to the thickness of the thermally conductive component and the contact area between the thermally conductive component and the electrode component, and inversely proportional to the contact area between the thermally conductive component and the thermally conductive wall and the average fluid volume of the battery cell in contact with the heat exchange mechanism.

[0030] In the embodiment of this application, when the thermal conductivity per unit fluid volume of the heat exchange mechanism is K, which satisfies the above conditions, the heat exchange mechanism can effectively transfer the heat of the heat-conducting components to regulate the temperature of the battery cells, without wasting the excess fluid volume of the heat exchange mechanism, thus avoiding the loss of cost of the heat exchange mechanism and energy density of the battery device.

[0031] In some embodiments, the thickness T of the heat-conducting component, the thermal conductivity D of the heat-conducting component, the contact area A1 between the heat-conducting component and the electrode component, the contact area A2 between the heat-conducting component and the heat-conducting wall, and the average fluid volume V of the battery cell in contact with the heat exchange mechanism are K = (T*D*A1) / (A2*V).

[0032] In the embodiments of this application, by adjusting parameters such as the thickness T of the heat-conducting component, the thermal conductivity D of the heat-conducting component, the contact area A1 between the heat-conducting component and the electrode component, the contact area A2 between the heat-conducting component and the heat-conducting wall, and the average fluid volume V of the battery cell in contact with the heat exchange mechanism, the thermal conductivity of the heat exchange medium per unit volume can be maintained within a suitable range. The heat exchange mechanism can effectively transfer the heat of the heat-conducting component to regulate the temperature of the battery cell without wasting excess fluid volume of the heat exchange mechanism, thus avoiding cost loss of the heat exchange mechanism and energy density loss of the battery device.

[0033] Thirdly, embodiments of this application provide an electrical device, including the battery device described in the second aspect of the embodiment above. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0035] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application;

[0036] Figure 2 is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0037] Figure 3 is a schematic diagram of the structure of a battery module provided in one embodiment of the application;

[0038] Figure 4 is an exploded view of a single battery cell provided in an embodiment of this application;

[0039] Figure 5 is an exploded view of a battery device provided in an embodiment of this application;

[0040] Figure 6 is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0041] Figure 7 is a cross-sectional view at point AA in Figure 6 in one embodiment of this application;

[0042] Figure 8 is a cross-sectional view at point AA in Figure 6 in another embodiment of this application;

[0043] Figure 9 is a cross-sectional view at BB in Figure 6 in one embodiment of this application;

[0044] Figure 10 is an exploded view of a battery device provided in another embodiment of this application;

[0045] Figure 11 is a schematic diagram of the structure of a battery cell provided in another embodiment of this application;

[0046] Figure 12 is a cross-sectional view at CC in Figure 11 of an embodiment of this application;

[0047] Figure 13 is a cross-sectional view at CC in Figure 11 of another embodiment of this application.

[0048] Figure label:

[0049] 1. Vehicle; 101. Motor; 102. Controller; 2. Battery Unit; 201. Battery Module; 202. Housing; 2021. First Housing; 2022. Second Housing;

[0050] 3. Battery cells;

[0051] 4. Shell; 41. Opening; 42. Heat-conducting wall;

[0052] 5. Electrode assembly; 51. Electrode tab; 52. Electrode body;

[0053] 6. Top cover assembly; 61. Electrode terminals;

[0054] 7. Thermally conductive component; 71. Thermally conductive part; 72. Extension part; 73. First connecting part; 74. Second connecting part; 711. First segment; 712. Second segment;

[0055] 8. Heat exchange mechanism;

[0056] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0057] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0058] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0059] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0060] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0061] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0062] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0064] Excessive temperature differences between the inside and outside of a battery cell during use can lead to a decrease in the cell's performance and lifespan.

[0065] The reason for the above problems is that during the operation of a battery cell, the electrode assembly undergoes an electrochemical reaction and generates heat. This heat needs to be exchanged between the casing and the external environment. Due to the limited thermal conductivity of the casing, the internal temperature of the battery cell cannot be quickly conducted to the outside, causing the internal temperature to accumulate and rise. The electrode assembly is prone to lithium plating due to excessive temperature. In low-temperature environments, it is also difficult for the external environment to heat the electrode assembly, resulting in a decrease in capacity and pulse performance of the battery cell due to low temperature, thus affecting the performance of the battery cell.

[0066] To address the aforementioned issues, this application provides a battery cell comprising a housing, an electrode assembly, and a heat-conducting assembly. The housing has an opening in a first direction, and the electrode assembly and heat-conducting assembly are housed within the housing. The thermal conductivity of the heat-conducting assembly is greater than that of the housing. The housing includes a heat-conducting wall for connection with a heat exchange mechanism. The housing facilitates heat exchange with the heat exchange mechanism at the heat-conducting wall. The electrode assembly is connected to the heat-conducting wall via a heat-conducting portion to facilitate heat exchange between the electrode assembly and the heat exchange mechanism, thereby improving the heat exchange rate between the internal and external environments of the battery cell, better balancing the temperature of the battery cell, and improving the performance and lifespan of the battery cell.

[0067] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0068] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0069] 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.

[0070] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either.

[0071] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or a battery pack. A battery pack generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0072] A single battery cell includes electrode components and an electrolyte. The electrode components include 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 components. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector includes a positive current-collecting section and a positive electrode tab connected to it. The current-collecting section is coated with the positive active material layer, while the tab is not. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section. The negative current collection section is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0073] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0074] Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1 provided in some embodiments of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 102 and a motor 101. The controller 102 is used to control the battery to supply power to the motor 101, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0075] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0076] Figure 2 shows a schematic diagram of the structure of a battery device according to an embodiment of this application.

[0077] The battery device 2 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 3, which are connected in series, parallel, or mixed connections via a busbar.

[0078] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 3.

[0079] As an example, the battery cell assembly can be a battery module 201, which is formed by arranging and fixing multiple battery cells 3 to form an independent module. As an example, the battery module 201 can be formed by binding multiple battery cells 3 together with cable ties.

[0080] In some embodiments, the battery device may be a battery pack, which includes a housing 202 and one or more battery cell assemblies housed in the housing 202.

[0081] As an example, the battery cell assembly can be a battery module 201, which can be housed in the housing by fixing the battery module 201 in the housing.

[0082] As an example, the battery cell assembly can also be housed in the housing 202 by directly fixing multiple battery cells 3 to the housing 202.

[0083] As an example, the housing 202 may include a first housing 2021 and a second housing 2022. The first housing 2021 and the second housing 2022 are fastened together, forming a closed space inside the housing 202 to house the battery cell assembly. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 2021 may be a top cover or a bottom plate.

[0084] As an example, the housing 202 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 202 forms an enclosed space to accommodate the battery cell assembly.

[0085] In some embodiments, the housing 202 may be part of the vehicle's chassis structure. For example, a portion of the housing 202 may be at least a portion of the vehicle's floor, or a portion of the housing 202 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0086] Figure 3 shows a schematic diagram of the structure of a battery module 201 according to an embodiment of this application.

[0087] In some embodiments, as shown in Figures 2 and 3, there are multiple battery cells 3, which are first connected in series, parallel, or mixed to form a battery module 201. The multiple battery modules 201 are then connected in series, parallel, or mixed to form a whole and housed in a housing 202.

[0088] Multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 3 in the battery module 201.

[0089] Figure 4 is an exploded view of a battery cell according to an embodiment of this application. The battery cell 3 refers to the smallest unit that makes up the battery. As shown in Figure 4, the battery cell 3 includes a top cover assembly 6, a housing 4, and an electrode assembly 5.

[0090] Electrode assembly 5 is the component in the battery cell 3 where the electrochemical reaction occurs. The casing 4 may contain one or more electrode assemblies 5. Electrode assembly 5 is mainly formed by winding or stacking electrode sheets, which are divided into positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body 52, while the portions of the positive and negative electrode sheets without active material each constitute a tab 51. The positive and negative tabs can be located together at one end of the electrode body 52 or separately at both ends of the electrode body 52. ​​During the charging and discharging process of the battery cell 3, the positive and negative active materials react with the electrolyte, and the tabs 51 connect to the electrode terminals to form a current loop.

[0091] The electrode assembly 5 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0092] In some embodiments, the electrode assembly 5 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0093] In some embodiments, the electrode assembly 5 is a stacked structure. As an example, multiple positive and negative electrodes can be provided, with multiple positive and multiple negative electrodes stacked alternately. Multiple spacers can be provided and respectively provided between any adjacent positive or negative electrodes. Alternatively, the spacers can be provided continuously and provided between any adjacent positive or negative electrodes by folding.

[0094] In some embodiments, the electrode assembly 5 may be cylindrical, flat, or polygonal, etc.

[0095] In some embodiments, the electrode assembly 5 is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0096] The battery cell 3 may include a housing. The housing 4 is an assembly used to cooperate with the top cover assembly 6 to form the internal environment of the battery cell 3, wherein the formed internal environment can accommodate the electrode assembly 5, electrolyte (not shown in the figure), and other components. The housing 4 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing 4 can be a sealed structure or a non-sealed structure. As an example, when the housing 4 is a non-sealed structure, the housing 4 serves to protect the electrode assembly 5, and a sealing bag is also included between the housing 4 and the electrode assembly 5. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 4 is a sealed structure, it is used to encapsulate the electrode assembly 5 and electrolyte, etc.

[0097] As an example, the battery cell 3 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0098] The housing 4 and the top cover assembly 6 can be independent components. One or more openings 41 can be provided on the housing 4, and one or more top cover assemblies 6 can close the openings 41 to form the internal environment of the battery cell 3. Optionally, the top cover assembly 6 and the housing 4 can also be integrated. Optionally, the top cover assembly 6 and the housing 4 can form a common connection surface before other components are inserted into the housing, and the top cover assembly 6 closes the housing 4 when it is necessary to encapsulate the interior of the housing 4.

[0099] In some embodiments, the electrode terminal 61 can be disposed on the top cover assembly 6 or on the housing 4, and the electrode terminal 61 is electrically connected to the tab 51. The electrode terminal 61 can be directly connected to the tab 51 or indirectly connected to the tab 51 through an adapter mechanism.

[0100] Please refer to Figures 5 to 7. Figure 5 is an exploded view of a battery device 2 provided in an embodiment of this application; Figure 6 is a structural schematic diagram of a battery cell 3 provided in an embodiment of this application; Figure 7 is a cross-sectional view at point AA in Figure 6 in an embodiment of this application.

[0101] In a first aspect, as shown in Figures 4 to 7, this application provides a battery cell 3, which includes a housing 4, an electrode assembly 5, and a heat-conducting assembly 7. The housing 4 includes an opening 41 in a first direction X. The electrode assembly 5 is housed within the housing 4. The heat-conducting assembly 7 is housed within the housing 4 and includes a heat-conducting portion 71. The thermal conductivity of the heat-conducting assembly 7 is greater than that of the housing 4. The housing 4 includes a heat-conducting wall 42, which is used to connect with a heat exchange mechanism 8. The heat-conducting portion 71 is connected between the inner surfaces of the electrode assembly 5 and the heat-conducting wall 42.

[0102] In the embodiment of this application, the battery cell 3 includes a housing 4, an electrode assembly 5, and a heat-conducting assembly 7. The housing 44 includes an opening 41 in the first direction X. The electrode assembly 5 and the heat-conducting assembly 7 are housed within the housing 44. The thermal conductivity of the heat-conducting assembly 7 is greater than that of the housing 4. The housing includes a heat-conducting wall 42 for connection with a heat exchange mechanism 8. The housing 4 can more easily exchange heat with the heat exchange mechanism 8 at the heat-conducting wall 42. The electrode assembly 5 is connected to the heat-conducting wall 42 through a heat-conducting part 71 to facilitate heat exchange between the electrode assembly 5 and the heat exchange mechanism 8, thereby improving the heat exchange rate between the internal and external environments of the battery cell 3, better balancing the temperature of the battery cell 3, and improving the performance and service life of the battery cell 3.

[0103] The electrode assembly 5 is formed by winding or stacking a diaphragm, a positive electrode plate and a negative electrode plate. The housing 4 includes an opening 41 at one end in the first direction X, and the tab 51 extends from the electrode assembly 5 toward the end of the opening 41; or the housing 4 includes openings 41 at both ends in the first direction X, and the tab 51 extends from both ends of the electrode assembly 5 in the first direction X.

[0104] The heat-conducting part 71 is connected between the electrode assembly 5 and the housing 4 so that the heat generated by the electrode assembly 5 during the operation of the battery cell 3 can be transferred to the housing 4 via the heat-conducting part 7, and then transferred to the external environment by the housing 4, thereby improving the problem of the electrode assembly 5 being too hot; or in a low-temperature environment, the heat-conducting part 7 can conduct external heat to the electrode assembly 5 through the housing 4.

[0105] Optionally, the heat-conducting part 71 is in contact with the electrode assembly 5 and the housing 4 to reduce the thermal resistance between the heat-conducting part 7, the housing 4 and the electrode assembly 5. At least one of the electrode assembly 5 and the housing 4 is bonded to the heat-conducting part 71 to improve the connection reliability between the heat-conducting part 7 and the electrode assembly 5, and / or the heat-conducting part 7 and the housing 4. Alternatively, under the weight of the electrode assembly 5, the heat-conducting part 71 is pressed against the housing 4 by the heat-conducting part 7, reducing the difficulty of setting up the heat-conducting part 7. Alternatively, during the use of the battery cell 3, the electrode assembly 5 will expand to press the heat-conducting part 71 against the inner surface of the housing 4, reducing the difficulty of setting up the heat-conducting part 7 and allowing the heat-conducting part 7 to have a more flexible setting position.

[0106] Optionally, the heat-conducting component 7 can be in the form of a strip, a flat plate, or a mesh, etc. The heat-conducting component 7 can be rectangular, circular, or rhomboid, etc. The specific shape and size of the heat-conducting component 7 can be flexibly designed.

[0107] The thermal conductivity of the heat-conducting component 7 is greater than that of the housing 4. The heat-conducting component 7 may include copper, copper alloy, silver, silver alloy, graphite, graphene, carbon nanotubes, or silicon carbide, etc.

[0108] 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)).

[0109] In some embodiments, the method for testing thermal conductivity may include the steady-state heat flow method (test standards such as ASTM D5470 and GB 5598), 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.

[0110] 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.

[0111] Optionally, the thermally conductive component 7 includes a thermally conductive material layer and an insulating material layer disposed on the surface of the thermally conductive material layer, so as to insulate the thermally conductive component 7, the electrode component 5, and the housing 4 from each other.

[0112] Optionally, at least two heat-conducting parts 71 are spaced apart and connected to the electrode assembly 5 and the housing 4 respectively to improve the heat conduction capacity of the heat-conducting parts 71.

[0113] The battery cell 3, the heat exchange mechanism 8, and other devices are housed in the housing 202 to form the battery device 2. The heat exchange mechanism 8 contains a circulating heat exchange medium, and the heat of the battery cell 3 can be exchanged to the external environment through the heat exchange medium to maintain the temperature balance of the battery cell 3.

[0114] For example, the heat exchange mechanism 8 can be a water-cooled plate or a phase change heat sink, etc.

[0115] Optionally, the housing 4 of the battery cell 3 includes several wall panels that enclose the chamber. The wall panel that is in direct contact with the heat exchange mechanism 8 is a heat-conducting wall 42. The projection of the heat exchange mechanism 8 onto the battery cell 3 coincides with the heat-conducting wall 42, and the heat exchange mechanism 8 and the heat-conducting wall 42 are arranged facing each other.

[0116] For example, if the battery cell 3 is a cylindrical battery cell 3, then the housing 4 may include a bottom plate and a side plate connected to the bottom plate. If the side plate of the cylindrical battery cell 3 is connected to the heat exchange mechanism 8, then its side plate is a heat-conducting wall 42; or if the bottom plate of the cylindrical battery cell 3 is connected to the heat exchange mechanism 8, then its bottom plate is a heat-conducting wall 42.

[0117] For example, if the battery cell 3 is a square-shell battery cell 3, then the housing 4 may include a bottom plate, a first side plate and a second side plate. The two first side plates are arranged opposite each other along the second direction Y, and the two second side plates are arranged opposite each other along the third direction Z. The wall plate in the first side plate, the second side plate or the bottom plate that is in direct contact with the heat exchange mechanism 8 is a heat-conducting wall 42.

[0118] During the operation of the battery cell 3, the heat-conducting wall 42 of the housing 4 is in contact with the heat exchange mechanism 8, while other parts of the housing 4 are in contact with the air. Therefore, the temperature difference between the electrode assembly 5 and the heat-conducting wall 42 is relatively larger than the temperature difference between the electrode assembly 5 and other parts of the housing 4. When the heat-conducting component 7 is connected to the electrode assembly 5 and the heat-conducting wall 42, compared to when the heat-conducting component 7 is connected to the electrode assembly 5 and other parts of the housing 4, the heat from the electrode assembly 5 can be transferred to the heat-conducting wall 42 at a faster rate due to the larger temperature difference between the electrode assembly 5 and the heat-conducting wall 42, thus more quickly equalizing the temperature of the battery cell 3.

[0119] In some embodiments, as shown in Figures 5 to 7, multiple electrode assemblies 5 are provided, and the multiple electrode assemblies 5 are stacked along the second direction Y, with at least a portion of the heat-conducting portion 71 disposed between two adjacent electrode assemblies 5.

[0120] In these embodiments, multiple electrode assemblies 5 are stacked along the second direction Y to increase the capacity of the battery cell 3. The temperature between adjacent electrode assemblies 5 is relatively high. At least a portion of the heat-conducting part 71 is disposed between two adjacent electrode assemblies 5 so that the heat-conducting part 71 can conduct heat between adjacent electrode assemblies 5 and the casing 4, so as to better regulate the temperature of the battery cell 3 and improve the performance and service life of the battery cell 3.

[0121] For example, the housing 4 is provided with two, three or four isoelectric assemblies 5.

[0122] Since heat between adjacent electrode components 5 is not easily exchanged with the outside through the housing 4, in this embodiment, a heat-conducting part 71 is provided between adjacent electrode components 5. The heat-conducting part 71 transfers the heat between adjacent electrode components 5 to the housing 4 and exchanges it with the external environment.

[0123] Optionally, the heat-conducting part 71 is bonded to at least one electrode assembly 5 to ensure a stable connection between the electrode assembly 5 and the heat-conducting part 71; or the heat-conducting part 71 is pressed between two electrode assemblies 5 to reduce the difficulty of setting the heat-conducting part 71.

[0124] Optionally, the electrode assembly 5 includes a first side facing another electrode assembly 5, and a heat-conducting part 71 is disposed between the two first sides of the two adjacent electrode assemblies 5. The heat-conducting part 71 covers the entire first side to increase the contact area between the heat-conducting assembly 7 and the electrode assembly 5 and improve the heat conduction efficiency between the heat-conducting assembly 7 and the electrode assembly 5.

[0125] Optionally, the heat-conducting part 71 can be in the form of a strip, a flat plate, or a mesh, etc. The heat-conducting part 71 can be rectangular, circular, or rhomboid, etc. The specific shape and size of the heat-conducting part 71 can be flexibly designed.

[0126] In some embodiments, as shown in Figures 5 to 7, a heat-conducting wall 42 is disposed on at least one side of the housing 4 in the third direction Z, wherein the first direction X, the second direction Y and the third direction Z intersect each other, and the heat-conducting part 71 extends along the third direction Z and is connected to the inner surface of the heat-conducting wall 42.

[0127] In these embodiments, a heat-conducting wall 42 is disposed on at least one side of the housing 4 in the third direction Z. A heat-conducting part 71 extends between adjacent electrode assemblies 5 in the third direction Z and is connected to the heat-conducting wall 42, so that the heat between adjacent electrode assemblies 5 can be conducted to the heat-conducting wall 42 through the heat-conducting part 71 and exchanged through the heat-conducting wall 42 and the heat exchange mechanism 8, so as to improve the heat exchange rate between the internal environment and the external environment of the battery cell 3, so as to better balance the temperature of the battery cell 3 and improve the performance and service life of the battery cell 3.

[0128] A heat-conducting wall 42 is disposed on one side of the housing 4 in the third direction Z, and a heat exchange mechanism 8 and a battery cell 3 are arranged along the third direction Z; or the heat-conducting wall 42 is disposed on both sides of the housing 4 in the third direction Z, and two heat exchange mechanisms 8 are disposed at both ends of the battery cell 3 in the third direction Z.

[0129] The heat-conducting part 71 extends along the third direction Z between adjacent electrode assemblies 5. One end of the heat-conducting part 71 in the third direction Z is located between adjacent electrode assemblies 5, and the other end of the heat-conducting part 71 in the third direction Z is connected to the heat-conducting wall 42 so that the heat-conducting part 71 can transfer heat between the electrode assembly 5 and the heat-conducting wall 42.

[0130] Optionally, during the process of inserting the electrode assembly 5 into the housing, in order to reduce the difficulty of inserting into the housing and to reserve expansion space for the electrode assembly 5 in the housing 4, there is a gap between the electrode assembly 5 and the housing 4 in the third direction Z. One end of the heat-conducting part 71 is between adjacent electrode assemblies 5, and the other end extends out after the electrode assembly 5, extending in the gap to connect with the housing 4.

[0131] In some embodiments, as shown in Figures 5 to 7, two heat-conducting walls 42 are respectively disposed on both sides of the housing 4 in the third direction Z, and the heat-conducting part 71 extends out from both ends of the electrode assembly 5 along the third direction Z and is connected to the two heat-conducting walls 42 respectively.

[0132] In these embodiments, two heat-conducting walls 42 are respectively disposed on both sides of the housing 4 in the third direction Z to increase the contact area between the battery cell 3 and the heat exchange mechanism 8. The heat-conducting part 71 extends from both ends of the electrode assembly 5 in the third direction Z and is connected to the two heat-conducting walls 42 respectively, so that the heat between adjacent electrode assemblies 5 is transferred to the two heat-conducting walls 42 through the heat-conducting part 71 and heat exchanged with the two heat exchange mechanisms 8 respectively, so as to improve the heat exchange rate between the internal environment and the external environment of the battery cell 3, so as to better balance the temperature of the battery cell 3 and improve the performance and service life of the battery cell 3.

[0133] Two heat-conducting walls 42 are respectively located on both sides of the housing 4 in the third direction Z, and two heat exchange mechanisms 8 are located on both sides of the housing 4 in the third direction Z. The heat between adjacent heat-conducting components 7 is transferred to the two heat-conducting walls 42 through heat conduction, and heat is exchanged between the two heat-conducting walls 42 and the two heat exchange mechanisms 8.

[0134] In some embodiments, as shown in Figures 5 to 7, the heat-conducting component 7 further includes an extension 72, which is disposed at one end of the heat-conducting part 71, is disposed on the inner surface of the heat-conducting wall 42 and extends along the second direction Y, and the heat-conducting part 71 is connected to the extension 72 to be connected to the heat-conducting wall 42 through the extension 72.

[0135] In these embodiments, the heat-conducting component 7 further includes an extension 72 disposed at one end of the heat-conducting part 71. The extension 72 is disposed on the inner surface of the heat-conducting wall 42 and extends along the second direction Y. The heat-conducting part 71 is connected to the heat-conducting wall 42 through the extension 72. The extension 72 increases the contact area between the heat-conducting component 7 and the heat-conducting wall 42, thereby improving the heat exchange rate between the heat-conducting component 7 and the heat-conducting wall 42, so as to better balance the internal temperature of the battery cell 3 and improve the performance and service life of the battery cell 3.

[0136] The heat-conducting part 71 is connected to the heat-conducting wall 42 through the extension part 72. The extension part 72 increases the contact area between the heat-conducting component 7 and the heat-conducting wall 42 to improve the heat exchange rate between the heat-conducting component 7 and the heat-conducting wall 42.

[0137] Optionally, the extension 72 and the heat-conducting part 71 are prepared separately and connected to each other to facilitate adjustment of the dimensions of the extension 72 and the heat-conducting part 71; or the extension 72 and the heat-conducting part 71 are prepared from the same substrate and obtained by bending to reduce the processing difficulty of the heat-conducting component 7.

[0138] Optionally, the extension 72 can be strip-shaped, flat, or mesh-like, and can be rectangular, circular, or rhomboid. The specific shape and size of the extension 72 can be flexibly designed.

[0139] Optionally, the extension 72 has an extension dimension of L1 in the second direction Y, and the inner surface of the heat-conducting wall 42 has a dimension of L2 in the second direction Y, satisfying L1≤L2, so as to increase the contact area between the heat-conducting component 7 and the heat-conducting wall 42 and improve the heat conduction rate between the heat-conducting component 7 and the heat-conducting wall 42.

[0140] Optionally, the extension 72 covers the entire heat-conducting wall 42 to increase the contact area between the heat-conducting component 7 and the heat-conducting wall 42, thereby improving the heat conduction rate between the heat-conducting component 7 and the heat-conducting wall 42.

[0141] Optionally, the extension 72 is attached to the heat-conducting wall 42 on one side of its thickness direction and to the electrode assembly 5 on the other side to enhance the heat conduction capability of the heat-conducting assembly 7 between the electrode assembly 5 and the heat-conducting wall 42.

[0142] Optionally, two heat-conducting walls 42 are respectively disposed on both sides of the housing 4 in the third direction Z, and two extensions 72 are respectively disposed at both ends of the heat-conducting part 71 and in contact with the heat-conducting walls 42 to improve the heat conduction rate of the heat-conducting assembly 7. Optionally, the two extensions 72 in contact with the two heat-conducting walls 42 may have the same or different dimensions and shapes.

[0143] Please refer to Figure 8, which is a cross-sectional view at point AA in Figure 6 in another embodiment of this application.

[0144] In some embodiments, as shown in FIG5, FIG6 and FIG8, the heat-conducting component 7 further includes a first connecting portion 73, which is connected to at least one end of the extension 72 in the second direction Y. The first connecting portion 73 is disposed between the housing 4 and the electrode assembly 5 along the second direction Y, and at least one of the housing 4 and the electrode assembly 5 is connected to the first connecting portion 73.

[0145] In these embodiments, the heat-conducting component 7 further includes a first connecting portion 73 connected to at least one end of the extension 72 in the second direction Y. The first connecting portion 73 is disposed between the housing 4 and the electrode assembly 5 along the second direction Y. The first connecting portion 73 is connected to the housing 4 to increase the contact area between the heat-conducting component 7 and the housing 4, thereby improving the heat exchange rate between the heat-conducting component 7 and the housing 4. And / or the first connecting portion 73 is connected to the electrode assembly 5 to increase the contact area between the heat-conducting component 7 and the electrode assembly 5, thereby improving the heat exchange rate between the heat-conducting component 7 and the electrode assembly 5, so as to better balance the internal temperature of the battery cell 3 and improve the performance and service life of the battery cell 3.

[0146] The first connecting portion 73 is connected to the extension portion 72. The first connecting portion 73 extends in the third direction Z between the housing 4 and the electrode assembly 5. The first connecting portion 73 is connected to the housing 4 and / or the electrode assembly 5 to improve the heat conduction rate between the heat-conducting assembly 7 and the housing 4 and / or the electrode assembly 5.

[0147] Optionally, the extension 72 and the first connecting part 73 are respectively prepared and connected to each other to facilitate adjustment of the size of the extension 72 and the first connecting part 73; or the extension 72 and the first connecting part 73 are prepared from the same substrate and obtained by bending to reduce the processing difficulty of the heat-conducting component 7.

[0148] Optionally, the first connecting part 73 can be strip-shaped, flat, or mesh-shaped, etc., and the first connecting part 73 can be rectangular, circular, or rhomboid, etc. The specific shape and size of the first connecting part 73 can be flexibly designed.

[0149] Optionally, the first connecting portion 73 is bonded to the housing 4 and / or the electrode assembly 5; or the first connecting portion 73 is pressed against the housing 4 by the electrode assembly 5.

[0150] Optionally, the two extensions 72 are respectively disposed at both ends of the heat-conducting part 71, and the first connecting part 73 is connected to the ends of the two extensions 72 to increase the size of the extensions 72 and improve the heat conduction capacity of the heat-conducting component 7; or the two extensions 72 are respectively disposed at both ends of the heat-conducting part 71, and the first connecting part 73 is connected to one first connecting part 73 and is independent of the other first connecting part 73, so as to reduce the risk of the heat-conducting component 7 being squeezed and damaged during the expansion of the electrode component 5.

[0151] Please refer to Figure 9, which is a cross-sectional view at BB in Figure 6 in one embodiment of this application.

[0152] In some embodiments, as shown in Figures 5 to 7 and 9, the heat-conducting component 7 further includes a second connecting portion 74, which is connected to one end of the extension 72 that is away from the opening 41 in the first direction X. The second connecting portion 74 is disposed between the housing 4 and the electrode assembly 5 in the first direction X, and at least one of the housing 4 and the electrode assembly 5 is connected to the first connecting portion 73.

[0153] In these embodiments, the heat-conducting component 7 further includes a second connecting portion 74 connected to one end of the extension 72 facing away from the opening 41 in the first direction X. The second connecting portion 74 is disposed between the housing 4 and the electrode assembly 5 along the first direction X. The second connecting portion 74 is connected to the housing 4 to increase the contact area between the heat-conducting component 7 and the housing 4, thereby improving the heat exchange rate between the heat-conducting component 7 and the housing 4, and / or the second connecting portion 74 is connected to the electrode assembly 5 to increase the contact area between the heat-conducting component 7 and the electrode assembly 5, thereby improving the heat exchange rate between the heat-conducting component 7 and the electrode assembly 5, so as to better balance the internal temperature of the battery cell 3 and improve the performance and service life of the battery cell 3.

[0154] The first connecting portion 73 is connected to the extension portion 72. The first connecting portion 73 extends in the third direction Z between the housing 4 and the electrode assembly 5. The first connecting portion 73 is connected to the housing 4 and / or the electrode assembly 5 to improve the heat conduction rate between the heat-conducting assembly 7 and the housing 4 and / or the electrode assembly 5.

[0155] Optionally, the heat-conducting component 7 includes a heat-conducting part 71, an extension part 72, a first connecting part 73, and a second connecting part 74 to increase the heat-conducting area of ​​the heat-conducting component 7 and improve the heat-conducting performance of the heat-conducting component 7.

[0156] Optionally, the extension 72 and the second connecting portion 74 are respectively prepared and connected to each other to facilitate adjustment of the dimensions of the extension 72 and the second connecting portion 74; or the extension 72 and the second connecting portion 74 are prepared from the same substrate and obtained by bending to reduce the processing difficulty of the heat-conducting component 7.

[0157] Optionally, the second connecting part 74 can be strip-shaped, flat, or mesh-shaped, etc., and the second connecting part 74 can be rectangular, circular, or rhomboid, etc. The specific shape and size of the second connecting part 74 can be flexibly designed.

[0158] Optionally, the second connecting portion 74 is bonded to the housing 4 and / or the electrode assembly 5; or the second connecting portion 74 is pressed against the housing 4 by the electrode assembly 5.

[0159] Optionally, the second connection portion 74 extends to one end surface of the electrode assembly 5 in the first direction X, or the second connection portion 74 extends to the inner surface of the housing 4 in the first direction X, so as to increase the size of the second connection portion 74 and improve the performance of the heat conduction assembly 7.

[0160] Please refer to Figures 10, 11, 12 and 13. Figure 10 is an exploded view of the battery device 2 provided in another embodiment of this application; Figure 11 is a structural schematic diagram of the battery cell 3 provided in another embodiment of this application; Figure 12 is a cross-sectional view at CC in Figure 11 in one embodiment of this application; Figure 13 is a cross-sectional view at CC in Figure 11 in another embodiment of this application.

[0161] In some embodiments, as shown in Figures 10 to 13, a heat-conducting wall 42 is disposed on at least one side of the housing 4 in the second direction Y, where the first direction X and the second direction Y intersect. The heat-conducting portion 71 includes a first segment 711 and a second segment 712. The first segment 711 is disposed between two adjacent electrode assemblies 5, and the second segment 712 is connected to at least one end of the first segment 711. The second segment 712 extends along the second direction Y between the housing 4 and the electrode assembly 5 and is connected to the heat-conducting wall 42.

[0162] In these embodiments, a heat-conducting wall 42 is disposed on at least one side of the housing 4 in the second direction Y. The heat-conducting part 71 includes a first segment 711 and a second segment 712. The first segment 711 is disposed between two adjacent electrode assemblies 5, and the second segment 712 is connected to one end of the first segment 711 and connected to the heat-conducting wall 42, so that the heat between adjacent electrode assemblies 5 can be conducted to the heat-conducting wall 42 through the heat-conducting part 71, and heat exchange can be carried out through the heat-conducting wall 42 and the heat exchange mechanism 8, so as to improve the heat exchange rate between the internal environment and the external environment of the battery cell 3, so as to better balance the temperature of the battery cell 3 and improve the performance and service life of the battery cell 3.

[0163] Optionally, the heat-conducting part 71 includes a first segment 711 and a second segment 712, which are respectively prepared and connected to each other to facilitate adjustment of the size of the first segment 711 and the second segment 712; or the first segment 711 and the second segment 712 are prepared from the same substrate and obtained by bending to reduce the processing difficulty of the heat-conducting component 7.

[0164] Optionally, the second segment 712 is connected to the housing 4 to increase the contact area between the heat-conducting component 7 and the housing 4, thereby improving the heat exchange rate between the heat-conducting component 7 and the housing 4, and / or the second segment 712 is connected to the electrode assembly 5 to increase the contact area between the heat-conducting component 7 and the electrode assembly 5, thereby improving the heat exchange rate between the heat-conducting component 7 and the electrode assembly 5.

[0165] For example, the heat-conducting wall 42 is disposed on one side of the housing 4 in the second direction Y, the first segment 711 is located between two adjacent electrode assemblies 5, one end of the second segment 712 is connected to the first segment 711, and the other end extends toward the heat-conducting wall 42 and is connected to the heat-conducting wall 42.

[0166] Optionally, the heat-conducting wall 42 is disposed on one side of the housing 4 in the second direction Y, and two second segments 712 are respectively disposed at both ends of the first segment 711 in the third direction Z and extend toward the heat-conducting wall 42.

[0167] In some embodiments, as shown in Figures 10 to 13, two heat-conducting walls 42 are respectively disposed on both sides of the housing 4 in the second direction Y, and the second segment 712 is respectively connected to the two heat-conducting walls 42 at both ends in the second direction Y.

[0168] In these embodiments, two heat-conducting walls 42 are respectively disposed on both sides of the housing 4 in the second direction Y to increase the contact area between the battery cell 3 and the heat exchange mechanism 8. The two ends of the second segment 712 are respectively connected to the two heat-conducting walls 42 so that the heat between adjacent electrode components 5 is transferred to the two heat-conducting walls 42 through the heat-conducting part 71 and heat exchanged with the two heat exchange mechanisms 8 respectively, so as to improve the heat exchange rate between the internal environment and the external environment of the battery cell 3, so as to better balance the temperature of the battery cell 3 and improve the performance and service life of the battery cell 3.

[0169] Optionally, as shown in Figure 12, the second segment 712 is disposed at at least one end of the first segment 711 in the third direction Z, the first segment 711 is connected to the middle of the second segment 712, the second segment 712 extends along the second direction Y, and its two ends in the second direction Y are connected to the heat-conducting wall 42; or as shown in Figure 13, the second segment 712 includes two sub-segments disposed at the two ends of the first segment 711 in the third direction Z, one end of the two sub-segments is connected to the first segment 711, and the other ends of the two sub-segments extend in opposite directions in the second direction Y and are respectively connected to a heat-conducting wall 42.

[0170] Optionally, the second segment 712 is disposed at both ends of the first segment 711 in the third direction Z. The first segment 711 is connected to the middle of the second segment 712. The second segment 712 extends along the second direction Y and is connected to the heat-conducting wall 42 at both ends in the second direction Y, so as to increase the contact area between the heat-conducting component 7 and the heat-conducting wall 42.

[0171] In some embodiments, as shown in Figures 10 to 13, the heat-conducting component 7 further includes an extension 72, which is connected to the end of the second segment 712 in the second direction Y. The extension 72 is disposed on the heat-conducting wall 42 and extends along the third direction Z. The heat-conducting part 71 is connected to the heat-conducting wall 42 through the extension 72. The first direction X, the second direction Y and the third direction Z intersect each other.

[0172] In these embodiments, the heat-conducting component 7 further includes an extension 72 connected to the end of the second segment 712 in the second direction Y. The extension 72 is disposed on the heat-conducting wall 42 and extends in the third direction Z. The heat-conducting part 71 is connected to the heat-conducting wall 42 through the extension 72. The extension 72 increases the contact area between the heat-conducting component 7 and the heat-conducting wall 42, thereby improving the heat exchange rate between the heat-conducting component 7 and the heat-conducting wall 42, so as to better balance the internal temperature of the battery cell 3 and improve the performance and service life of the battery cell 3.

[0173] Optionally, the extension 72 covers the entire heat-conducting wall 42 to increase the contact area between the heat-conducting component 7 and the heat-conducting wall 42, thereby improving the heat conduction rate between the heat-conducting component 7 and the heat-conducting wall 42.

[0174] Optionally, the extension 72 is attached to the heat-conducting wall 42 on one side of its thickness direction and to the electrode assembly 5 on the other side to enhance the heat conduction capability of the heat-conducting assembly 7 between the electrode assembly 5 and the heat-conducting wall 42. Exemplarily, the extension 72 is pressed against the heat-conducting wall 42 by the electrode assembly 5.

[0175] Optionally, two heat-conducting walls 42 are respectively disposed on both sides of the housing 4 in the third direction Z, and at least two extensions 72 are respectively disposed at both ends of the second segment 712 and in contact with the heat-conducting walls 42 to improve the heat conduction rate of the heat-conducting component 7.

[0176] Secondly, as shown in Figures 5 to 7, this application provides a battery device 2, which includes a housing 202, a heat exchange mechanism 8, and a battery cell 3 as described in the first aspect embodiment. The battery cell 3 and the heat exchange mechanism 8 are housed in the housing 202, and the heat exchange mechanism 8 and the housing 4 are thermally connected.

[0177] In the embodiment of this application, the battery device 2 includes a housing 202, a heat exchange mechanism 8, and a battery cell 3. The heat exchange mechanism 8 and the battery cell 3 are housed in the housing 202. The heat exchange mechanism 8 and the housing 4 are thermally connected so that the heat of the electrode assembly 5 can be transferred to the heat exchange mechanism 8 through the heat-conducting component 7 and the housing 4. The heat exchange mechanism 8 balances the temperature of the battery cell 3 and improves the performance of the battery device 2.

[0178] The housing 202 houses a heat exchange mechanism 8 and a battery cell 3. The heat-conducting component 7 inside the battery cell 3 is connected to the electrode assembly 5 and the housing 4. Heat from the electrode assembly 5 is transferred to the housing 4, where it exchanges heat with the external environment. By incorporating the heat exchange mechanism 8 within the housing 202, which contains a heat exchange medium, the temperature difference between the internal and external environments of the battery cell 3 is increased, thereby accelerating the temperature exchange rate and better balancing the temperature of the battery cell 3.

[0179] For example, the heat exchange mechanism 8 can be a water-cooled plate or a phase change heat exchange plate, etc.

[0180] In some embodiments, as shown in Figures 5 to 7, the housing 4 includes a heat-conducting wall 42, and a heat exchange mechanism 8 and a heat-conducting component 7 are respectively connected to the two sides of the heat-conducting wall 42 in the thickness direction.

[0181] In these embodiments, the heat exchange mechanism 8 and the heat conduction component 7 are respectively connected to the two sides of the heat conduction wall 42 in the thickness direction, so that the heat of the heat conduction component 7 can be transferred to the heat exchange mechanism 8 through the heat conduction wall 42, thereby improving the temperature regulation effect of the heat exchange mechanism 8 on the battery cell 3, so as to better balance the temperature of the battery cell 3 and improve the performance of the battery device 2.

[0182] During the operation of the battery cell 3, the heat-conducting wall 42 of the housing 4 is in contact with the heat exchange mechanism 8, while other parts of the housing 4 are in contact with the air. Therefore, the temperature difference between the electrode assembly 5 and the heat-conducting wall 42 is relatively larger than the temperature difference between the electrode assembly 5 and other parts of the housing 4. When the heat-conducting component 7 is connected to the electrode assembly 5 and the heat-conducting wall 42, compared to when the heat-conducting component 7 is connected to the electrode assembly 5 and other parts of the housing 4, the heat from the electrode assembly 5 can be transferred to the heat-conducting wall 42 at a faster rate due to the larger temperature difference between the electrode assembly 5 and the heat-conducting wall 42, thus more quickly equalizing the temperature of the battery cell 3.

[0183] In some embodiments, as shown in Figures 5 to 7, the thermal conductivity per unit fluid volume of the heat exchange mechanism 8 is K, satisfying 10 -8 W / (mm 3 ·K)≤K≤10 -4 W / (mm 3 K) is directly proportional to the thickness of the heat-conducting component 7 and the contact area between the heat-conducting component 7 and the electrode component 5, and inversely proportional to the contact area between the heat-conducting component 7 and the heat-conducting wall 42 and the average fluid volume of the battery cell 3 in contact with the heat exchange mechanism 8.

[0184] In these embodiments, when the thermal conductivity per unit fluid volume of the heat exchange mechanism 8 meets the above conditions, the heat exchange mechanism 8 can effectively transfer the heat of the heat conduction component 7 to regulate the temperature of the battery cell 3, without wasting the excess fluid volume of the heat exchange mechanism 8, thus avoiding the loss of cost of the heat exchange mechanism 8 and energy density of the battery device 2.

[0185] A single heat exchange mechanism 8 is in contact with n battery cells 3, where n ≥ 1. The fluid volume of the heat exchange mechanism 8 is V0. Then, the average fluid volume of each battery cell 3 in contact with the heat exchange mechanism 8 is V = V0 / n.

[0186] For example, if the battery cell 3 includes a heat-conducting wall 42, then V0 refers to the fluid volume of a heat exchange mechanism 8 in contact with the heat-conducting wall 42; or if the battery cell 3 includes two heat-conducting walls 42, then V0 refers to the sum of the fluid volumes of the two heat exchange mechanisms 8 in contact with the two heat-conducting walls 42.

[0187] The heat exchange mechanism 8 provides a thermal conductivity of K*V for a single battery cell 3. By adjusting the value of K, the thermal conductivity provided by the heat exchange mechanism 8 for a single battery cell 3 can be adjusted. When K is within the above range, the heat exchange mechanism 8 can stabilize the temperature of the battery cell 3 within the preset range, thereby improving the performance of the battery cell 3. Furthermore, the heat exchange mechanism 8 will not suffer a loss in cost or energy density due to the waste of thermal conductivity.

[0188] For example, both sides of the heat exchange mechanism 8 in the thickness direction are in contact with the battery cells 3, and the fluid volume of the heat exchange mechanism 8 is evenly distributed to all the battery cells 3 in contact with it. The fluid volume of the heat exchange mechanism 8 is 36000 mm². 3 Since the heat exchange mechanism 8 contacts both battery cells 3, the average fluid volume of each battery cell 3 in contact with the heat exchange mechanism 8 is 18000 mm³. 3 .

[0189] For example, one side of the heat exchange mechanism 8 in the thickness direction contacts two battery cells 3, and the fluid volume of the heat exchange mechanism 8 is 36000 mm². 3 The average fluid volume of each battery cell 3 in contact with the heat exchange mechanism 8 is 18000 mm³. 3 .

[0190] For example, K can be 1*10 -8 W / (mm 3 ·K), 1*10 -6 W / (mm 3 ·K), 5*10 -5 W / (mm 3 ·K) or 1*10 -4 W / (mm 3 ·K) etc.

[0191] In some embodiments, as shown in Figures 5 to 7, the thickness T of the heat-conducting component 7, the thermal conductivity D of the heat-conducting component 7, the contact area A1 between the heat-conducting component 7 and the electrode component 5, the contact area A2 between the heat-conducting component 7 and the heat-conducting wall 42, and the average fluid volume V of the battery cell 3 in contact with the heat exchange mechanism 8 are K = (T*D*A1) / (A2*V).

[0192] In these embodiments, by adjusting parameters such as the thickness T of the heat-conducting component 7, the thermal conductivity D of the heat-conducting component 7, the contact area A1 between the heat-conducting component 7 and the electrode component 5, the contact area A2 between the heat-conducting component 7 and the heat-conducting wall 42, and the average fluid volume V of the battery cell 3 in contact with the heat exchange mechanism 8 using the above formulas, the thermal conductivity of the heat exchange medium per unit volume can be maintained within a suitable range. The heat exchange mechanism 8 can effectively transfer the heat from the heat-conducting component 7 to regulate the temperature of the battery cell 3 without wasting excess fluid volume of the heat exchange mechanism 8, thus avoiding cost loss of the heat exchange mechanism 8 and energy density loss of the battery device 2.

[0193] The thermal conductivity of the heat-conducting component 7 is related to the specific material of the heat-conducting component 7. The thermal conductivity value of the heat-conducting component 7 can be adjusted by adjusting the material of the heat-conducting component 7. For example, the thermal conductivity D of the heat-conducting component 7 satisfies 300W / (m·K)≤D≤3000W / (m·K).

[0194] Optionally, if the thermal conductive component 7 is an isotropic material, such as a metal material, and its thermal conductivity is the same in all directions, then the thermal conductivity of the thermal conductive component 7 can be obtained by referring to the thermal conductivity test method provided in the above embodiment.

[0195] If the thermally conductive component 7 is an anisotropic material, such as graphite or carbon fiber composite material, its thermal conductivity will vary significantly in different directions. In this case, the thermal conductivity of the thermally conductive component 7 is the thermal conductivity in the direction of heat transfer during actual use, or the thermal conductivity in its extension direction. When the thermally conductive component 7 is anisotropic, its thermal conductivity can be tested using the transient planar heat source method (test standards include ASTM E1461, GB22588, etc.).

[0196] K = (T*D*A1) / (A2*V), where K*V is the thermal conductivity of the heat exchange mechanism 8 acting on the heat-conducting wall 42 of a single battery cell 3; T*D*A1 is the heat conducted from the electrode assembly 5 to the heat-conducting assembly 7; (T*D*A1) / A2 is the heat transferred per unit contact area from the heat-conducting assembly 7 to the heat-conducting wall 42; and (T*D*A1) / (A2*V) is the ratio of the heat per unit area on the heat-conducting wall 42 to the fluid volume distributed in the battery cell 3, which is the ability of the heat exchange mechanism 8 to conduct heat from the heat-conducting wall 42. By adjusting the value of K, the overall heat dissipation capacity of the heat exchange mechanism 8 can be adjusted to regulate the temperature of the battery cell 3, so that the battery cell 3 operates within a suitable temperature range.

[0197] For example, as shown in Figure 5, the heat-conducting component 7 uses a 0.2 mm thick superconducting material with a thermal conductivity of 1500 W / (m·K), and its contact area with the electrode component 5 is 43218 mm². 2The contact area between the heat-conducting component 7 and the heat-conducting wall 42 is 12348 mm². 2 The average fluid volume of the battery cell 3 in contact with the heat exchange mechanism 8 is 47250 mm³. 3 Therefore, the thermal conductivity per unit fluid volume of heat exchange mechanism 8 is 2.22 * 10⁻⁶. -5 W / (mm 3 •K). The highest temperature of battery cell 3 was measured to be 45℃ when it was charged from 10% SOC (State of Charge) to 80% SOC.

[0198] For example, the heat-conducting component 7 uses a 0.04 mm thick superconducting material with a thermal conductivity of 300 W / (m·K), and its contact area with the electrode component 5 is 24570 mm². 2 The contact area between the heat-conducting component 7 and the heat-conducting wall 42 is 24570 mm². 2 The average fluid volume of the battery cell 3 in contact with the heat exchange mechanism 8 is 71400 mm³. 3 Therefore, the thermal conductivity per unit fluid volume of heat exchange mechanism 8 is 1.18 * 10⁻⁶. -7 W / (mm3·K). The highest temperature of battery cell 3 was measured to be 49℃ when it was charged from 10% SOC to 80% SOC.

[0199] For example, the heat-conducting component 7 uses a 0.3 mm thick superconducting material with a thermal conductivity of 3000 W / (m·K), and its contact area with the electrode component 5 is 24570 mm². 2 The contact area between the heat-conducting component 7 and the heat-conducting wall 42 is 24570 mm². 2 The average fluid volume of the battery cell 3 in contact with the heat exchange mechanism 8 is 71400 mm³. 3 Therefore, the thermal conductivity per unit fluid volume of heat exchange mechanism 8 is 1.26 * 10⁻⁶. -5 W / (mm3·K). The highest temperature of battery cell 3 was measured to be 46℃ when it was charged from 10% SOC to 80% SOC.

[0200] For example, the heat-conducting component 7 uses a 0.3 mm thick superconducting material with a thermal conductivity of 3000 W / (m·K), and its contact area with the electrode component 5 is 32000 mm². 2 The contact area between the heat-conducting component 7 and the heat-conducting wall 42 is 16000 mm². 2 The average fluid volume of the battery cell 3 in contact with the heat exchange mechanism 8 is 47250 mm³. 3 Therefore, the thermal conductivity per unit fluid volume of heat exchange mechanism 8 is 2.14 * 10⁻⁶. -5 W / (mm 3•K). The highest temperature of battery cell 3 was measured to be 45℃ when it was charged from 10% SOC to 80% SOC.

[0201] It should be noted that the other unspecified conditions in the above four embodiments are the same.

[0202] Thirdly, embodiments of this application provide an electrical device, including the battery device described in the second aspect of the embodiment above.

[0203] In some embodiments, as shown in Figures 1 to 13, this application provides a battery device 2. The battery device 2 includes a housing 202, a heat exchange mechanism 8, and a battery cell 3 as described in the first aspect embodiment. The battery cell 3 and the heat exchange mechanism 8 are housed within the housing 202. The heat exchange mechanism 8 and the housing 4 are thermally connected. The battery cell 3 includes a housing 4, an electrode assembly 5, and a heat-conducting assembly 7. The housing 4 includes an opening 41 in a first direction X. The electrode assembly 5 is housed within the housing 4. The heat-conducting assembly 7 is housed within the housing 4 and includes a heat-conducting portion 71. Connecting the inner surfaces of the electrode assembly 5 and the housing 4, the thermal conductivity of the heat-conducting component 7 is greater than that of the housing 4. The housing 4 includes a heat-conducting wall 42. The heat exchange mechanism 8 and the heat-conducting component 7 are respectively connected to the two sides of the heat-conducting wall 42 in its thickness direction. The thickness T of the heat-conducting component 7, the thermal conductivity D of the heat-conducting component 7, the contact area A1 between the heat-conducting component 7 and the electrode assembly 5, the contact area A2 between the heat-conducting component 7 and the heat-conducting wall 42, and the average fluid volume V of the battery cell 3 in contact with the heat exchange mechanism 8, K = (T*D*A1) / (A2*V), satisfying 10. -8 W / (mm 3 ·K)≤K≤10 -4 W / (mm 3 ·K), multiple electrode assemblies 5 are provided, and the multiple electrode assemblies 5 are stacked along the second direction Y. At least a portion of the heat-conducting part 71 is provided between two adjacent electrode assemblies 5. The heat-conducting wall 42 is provided on at least one side of the housing 4 in the third direction Z. The first direction X, the second direction Y and the third direction Z intersect each other. The heat-conducting part 71 extends along the third direction Z and is connected to the inner surface of the heat-conducting wall 42. The two heat-conducting walls 42 are respectively provided on both sides of the housing 4 in the third direction Z. The heat-conducting part 71 extends from both ends of the electrode assembly 5 along the third direction Z and is connected to the two heat-conducting walls 42 respectively. The heat-conducting assembly 7 also includes an extension part 72. The extension part 72 is provided at one end of the heat-conducting part 71. The extension part 72 is provided on the inner surface of the heat-conducting wall 42 and extends along the second direction Y. The heat-conducting part 71 is connected to the extension part 72 so as to be connected to the heat-conducting wall 42 through the extension part 72.

[0204] In the embodiment of this application, the battery cell 3 includes a housing 4, an electrode assembly 5, and a heat-conducting assembly 7. The housing 44 includes an opening 41 in the first direction X. The electrode assembly 5 and the heat-conducting assembly 7 are housed within the housing 4. The thermal conductivity of the heat-conducting assembly 7 is greater than that of the housing 4. The housing 4 includes a heat-conducting wall 42 for connection with a heat exchange mechanism 8. The housing 4 can more easily exchange heat with the heat exchange mechanism 8 at the heat-conducting wall 42. The electrode assembly 5 is connected to the heat-conducting wall 42 through a heat-conducting part 71 to facilitate heat exchange between the electrode assembly 5 and the heat exchange mechanism 8, thereby improving the heat exchange rate between the internal and external environments of the battery cell 3, better balancing the temperature of the battery cell 3, and improving the performance and service life of the battery cell 3.

[0205] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A single battery cell, comprising: The housing includes an opening in the first direction; Electrode assembly, housed within the housing; A thermally conductive component, housed within the housing, includes a thermally conductive portion, and the thermal conductivity of the thermally conductive component is greater than that of the housing. The housing includes a heat-conducting wall for connection with a heat exchange mechanism, and the heat-conducting part is connected between the electrode assembly and the inner surface of the heat-conducting wall.

2. The battery cell according to claim 1, wherein, Multiple electrode assemblies are provided, and the multiple electrode assemblies are stacked along the second direction. At least a portion of the heat-conducting portion is disposed between two adjacent electrode assemblies.

3. The battery cell according to claim 2, wherein, The heat-conducting wall is disposed on at least one side of the housing in a third direction, wherein the first direction, the second direction, and the third direction intersect each other, and the heat-conducting part extends along the third direction and is connected to the inner surface of the heat-conducting wall.

4. The battery cell according to claim 3, wherein, The two heat-conducting walls are respectively disposed on both sides of the housing in the third direction, and the heat-conducting part extends from both ends of the electrode assembly in the third direction and is respectively connected to the two heat-conducting walls.

5. The battery cell according to claim 3 or 4, wherein, The heat-conducting component further includes an extension portion disposed at one end of the heat-conducting portion, the extension portion being disposed on the inner surface of the heat-conducting wall and extending along the second direction, and the heat-conducting portion being connected to the extension portion to be connected to the heat-conducting wall through the extension portion.

6. The battery cell according to claim 5, wherein, The heat-conducting component further includes a first connecting portion, which is connected to at least one end of the extension in the second direction. The first connecting portion is disposed between the housing and the electrode assembly along the second direction, and at least one of the housing and the electrode assembly is connected to the first connecting portion.

7. The battery cell according to claim 5 or 6, wherein, The heat-conducting component further includes a second connecting portion, which is connected to one end of the extension portion that is away from the opening in the first direction. The second connecting portion is disposed between the housing and the electrode assembly along the first direction, and at least one of the housing and the electrode assembly is connected to the second connecting portion.

8. The battery cell according to claim 2, wherein, The heat-conducting wall is disposed on at least one side of the housing in the second direction, where the first direction and the second direction intersect. The heat-conducting part includes a first segment and a second segment. The first segment is disposed between two adjacent electrode assemblies, and the second segment is connected to at least one end of the first segment. The second segment extends along the second direction between the housing and the electrode assembly and is connected to the heat-conducting wall.

9. The battery cell according to claim 8, wherein, The two heat-conducting walls are respectively disposed on both sides of the housing in the second direction, and the two ends of the second segment in the second direction are respectively connected to the two heat-conducting walls.

10. The battery cell according to claim 8 or 9, wherein, The heat-conducting component further includes an extension portion connected to the end of the second segment in the second direction. The extension portion is disposed on the heat-conducting wall and extends along a third direction. The heat-conducting portion is connected to the heat-conducting wall through the extension portion. The first direction, the second direction, and the third direction intersect each other.

11. A battery device comprising a housing, a heat exchange mechanism, and a battery cell as described in any one of claims 1-10, wherein the battery cell and the heat exchange mechanism are housed within the housing, and the heat exchange mechanism is thermally connected to the housing.

12. The battery device according to claim 11, wherein, The housing includes a heat-conducting wall, and the heat exchange mechanism and the heat-conducting assembly are respectively connected to the two sides of the heat-conducting wall in its thickness direction.

13. The battery device according to claim 12, wherein, The heat exchange mechanism has a thermal conductivity of K per unit fluid volume, which satisfies 10. -8 W / (mm 3 ·K)≤K≤10 -4 W / (mm 3 ·K), K is directly proportional to the thickness of the thermally conductive component and the contact area between the thermally conductive component and the electrode component, and inversely proportional to the contact area between the thermally conductive component and the thermally conductive wall and the average fluid volume of the battery cell in contact with the heat exchange mechanism.

14. The battery device according to claim 13, wherein, The thickness T of the heat-conducting component, the thermal conductivity D of the heat-conducting component, the contact area A1 between the heat-conducting component and the electrode component, the contact area A2 between the heat-conducting component and the heat-conducting wall, and the average fluid volume V of the battery cell in contact with the heat exchange mechanism are given by K = (T*D*A1) / (A2*V).

15. An electrical device comprising the battery device according to any one of claims 11-14.

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