Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, and belongs to the technical field of batteries. The battery device comprises a box body, a heat management part, a heat insulation part, a heat conduction part and a plurality of battery monomers, the plurality of battery cells are accommodated in the box body; the thermal management member is located on one side of all the battery cells in the first direction. The heat insulation part is arranged between two adjacent battery monomers along a second direction, and comprises two heat insulation parts arranged along the second direction, and the second direction is perpendicular to the first direction. At least part of the heat conduction piece is arranged between the two heat insulation parts in the second direction, and the heat conduction piece is connected with the heat management component. By adopting the heat insulation piece and the heat conduction piece with the composite structure, a relatively good heat insulation effect can be achieved without increasing the distance between two adjacent battery monomers, so that the phenomenon that heat spreads or is continuously accumulated in the box body can be effectively relieved while the utilization rate of the internal space of the battery device is improved.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. A battery pack consists of a casing and multiple battery cells housed within it. As a core component of new energy vehicles, the battery pack has high requirements in terms of stability, reliability, and lifespan. However, the battery cells generate a significant amount of heat during continuous charging and discharging, especially when thermal runaway occurs. This heat can spread and accumulate within the casing, potentially affecting adjacent battery cells or causing a rapid rise in temperature inside the casing. This severely impacts the battery pack's performance and lifespan, and may even lead to risks such as fire or explosion during use, hindering the improvement of the battery pack's lifespan and reliability. Utility Model Content

[0003] This application provides a battery device and an electrical device that can effectively improve the service life and reliability of the battery device.

[0004] In a first aspect, embodiments of this application provide a battery device, including a housing, a thermal management component, a heat insulation component, a heat conduction component, and a plurality of battery cells; the plurality of battery cells are housed within the housing; the thermal management component is located on one side of all the battery cells in a first direction, and the thermal management component is configured to manage the temperature of the battery cells; the heat insulation component is disposed between two adjacent battery cells along a second direction, and the heat insulation component includes two heat insulation portions arranged along the second direction, the second direction being perpendicular to the first direction; at least a portion of the heat conduction component is disposed between two heat insulation portions in the second direction, and the heat conduction component is connected to the thermal management component.

[0005] In the above technical solution, a heat insulation component is provided between two adjacent battery cells in the second direction, and the heat insulation component includes two heat insulation parts arranged along the second direction, so that the heat insulation component can play a heat insulation role between two adjacent battery cells, thereby reducing the thermal impact and heat spread between multiple battery cells. Specifically, by disposing at least a portion of a heat-conducting component between two heat insulation parts and connecting the heat-conducting component to a thermal management component, the heat-conducting component is a structure sandwiched between the two heat insulation parts of the heat insulation component. Furthermore, the heat insulation component and the heat-conducting component disposed between two adjacent battery cells form a composite structure through mutual cooperation, enabling the heat-conducting component to transfer a portion of the heat penetrating the heat insulation parts to the thermal management component for heat exchange, thereby reducing the thermal impact and heat spread between the battery cells. The heat that the insulation cannot block is carried away, which helps to further reduce the thermal impact and heat spread between multiple battery cells. Therefore, it is not necessary to increase the thickness of the insulation to improve the insulation effect between multiple battery cells. This allows the insulation and heat conduction components with this composite structure to achieve good insulation effect without increasing the spacing between two adjacent battery cells. This helps to improve the utilization of the internal space of the battery device and effectively alleviate the phenomenon of heat spread or continuous accumulation in the box, thereby reducing the risk of fire and explosion during the use of the battery device. In this way, the battery device's energy density can be maintained while improving its service life and reliability.

[0006] In some embodiments, along the second direction, the heat-conducting member includes a body portion located between the two heat-insulating portions, the body portion and the heat-insulating portions being stacked and connected.

[0007] In the above technical solution, by setting the body part of the heat-conducting component located between the two heat insulation parts as a structure that is stacked and connected to the two heat insulation parts, on the one hand, the assembly compactness and assembly stability of the heat insulation and heat-conducting components can be improved, which is conducive to saving the space occupied by the heat insulation and heat-conducting components. On the other hand, the contact area between the heat insulation and heat-conducting components can be increased, which is conducive to improving the effect of the heat-conducting component in transferring part of the heat that penetrates the heat insulation part to the heat management component and exchanging heat.

[0008] In some embodiments, the body portion and the heat insulation portion are bonded together.

[0009] In the above technical solution, by setting the body part and the heat insulation part to be bonded together, it is beneficial to reduce the assembly difficulty between the body part and the heat insulation part, and to improve the assembly reliability and contact area between the body part and the heat insulation part.

[0010] In some embodiments, along the second direction, the total thickness of the body portion and the two heat insulation portions after being stacked is D1, satisfying 0.5mm≤D1≤5mm.

[0011] In the above technical solution, by setting the total thickness of the main body and the two heat insulation parts after being stacked in the second direction to 0.5mm to 5mm, on the one hand, it can alleviate the phenomenon of poor heat insulation effect due to insufficient thickness of the heat insulation and heat conduction parts, thereby reducing the risk of heat influence and heat spread between multiple battery cells. On the other hand, it can alleviate the phenomenon of excessive space occupied by the heat insulation and heat conduction parts, thereby reducing the distance between two adjacent battery cells and improving the energy density of the battery device.

[0012] In some embodiments, along the second direction, the thickness of the heat insulation portion is D2, satisfying 0.1≤D2 / D1≤0.8.

[0013] In the above technical solution, by setting the thickness of the heat insulation part to 0.1 to 0.8 of the total thickness of the main body and the two heat insulation parts after being stacked in the second direction, on the one hand, the thickness ratio of the heat insulation part can be increased to improve the heat insulation effect of the heat insulation part. On the other hand, it can alleviate the phenomenon that the thickness of the main body of the heat conductor is insufficient due to the excessive thickness occupied by the heat insulation part. This can improve the effect of the heat conductor in transferring part of the heat that penetrates the heat insulation part to the thermal management component and exchanging heat. In turn, it can improve the heat insulation effect of the composite structure formed by the heat insulation part and the heat conductor between two adjacent battery cells.

[0014] In some embodiments, along the second direction, the thickness of the heat insulation portion is D2 and the thickness of the body portion is D3, satisfying 0.01≤D3 / D2≤0.5.

[0015] In the above technical solution, on the one hand, setting the thickness of the body of the heat-conducting component to be greater than or equal to 0.01 of the thickness of the heat-insulating component is beneficial to increasing the thickness ratio of the body of the heat-conducting component, thereby improving the effect of the heat-conducting component in transferring part of the heat penetrating the heat-insulating component to the thermal management component for heat exchange. On the other hand, setting the thickness of the body of the heat-conducting component to be less than or equal to 0.5 of the thickness of the heat-insulating component can alleviate the phenomenon that the thickness of the heat-insulating component is too small due to the excessive thickness of the body or that the total thickness of the body and the two heat-insulating components after being stacked in the second direction is too large. This can improve the heat insulation effect between two adjacent battery cells while taking into account the energy density of the battery device.

[0016] In some embodiments, along the first direction, a partition layer is provided at one end of the heat insulation portion away from the thermal management component, and the partition layer connects two heat insulation portions; wherein, the body portion is located on the side of the partition layer facing the thermal management component in the first direction.

[0017] In the above technical solution, by connecting the two heat insulation parts to the end away from the thermal management component in the first direction with a partition layer, and the main body part being disposed on the side of the partition layer facing the thermal management component in the first direction, the partition layer can play a certain role in separating and shielding the main body part of the heat-conducting component. On the one hand, the partition layer can play a certain role in protecting the heat-conducting component, thereby reducing the risk of impact during use. On the other hand, it can reduce the phenomenon of heat transfer in the box after the main body part of the heat-conducting component overlaps with other components, thereby facilitating the heat-conducting component to transfer heat to the thermal management component for heat exchange, thereby further reducing the risk of heat spreading in the box.

[0018] In some embodiments, in a projection plane perpendicular to the first direction, the orthographic projection of the body portion lies within the orthographic projection of the partition layer.

[0019] In the above technical solution, by setting the projection of the main body in the first direction to a structure located within the partition layer, it is beneficial to further improve the partition effect of the partition layer on the main body of the heat-conducting component, thereby further improving the protective effect of the partition layer on the heat-conducting component, further reducing the risk of impact to the heat-conducting component during use, and further reducing the phenomenon of heat transfer within the box after the main body of the heat-conducting component overlaps with other components. This facilitates the heat-conducting component to transfer heat to the thermal management component for heat exchange, and further reduces the risk of heat spreading within the box.

[0020] In some embodiments, the partition layer is connected to the body portion.

[0021] In the above technical solution, by connecting the main body and the partition layer to each other, the partition layer is a structure that connects the main body and the two heat insulation parts, thereby further improving the connection reliability and assembly stability of the main body and the two heat insulation parts.

[0022] In some embodiments, the thermal conductivity of the separator is λ1, which satisfies 0.01W / (m·K)≤λ1≤0.5W / (m·K).

[0023] In the above technical solution, by setting the partition layer to a structure with a thermal conductivity of 0.01 W / (m·K) to 0.5 W / (m·K), the partition layer has a good heat insulation effect. Thus, the partition layer can also play a heat insulation role at the end of the heat-conducting component that is away from the heat management component along the first direction, so as to reduce the phenomenon that the heat-conducting component releases heat into the box from the end away from the heat management component, thereby further reducing the risk of heat spread in the box.

[0024] In some embodiments, two of the heat insulation portions are disposed and spaced apart along the second direction.

[0025] In the above technical solution, by setting the heat insulation part as a separate part and arranging it at intervals along the second direction, the difficulty of setting the heat conduction component between the two heat insulation parts can be reduced, and the manufacturing difficulty of the separator can be reduced, thereby reducing the manufacturing difficulty of the battery device and improving the production efficiency of the battery device.

[0026] In some embodiments, the thermal conductivity of the insulation element is λ2, which satisfies 0.003W / (m·K)≤λ2≤0.1W / (m·K).

[0027] In the above technical solution, by setting the heat insulation component to a structure with a thermal conductivity of 0.003 W / (m·K) to 0.1 W / (m·K), the heat insulation component can play a good heat insulation effect between two adjacent battery cells, thereby reducing the thermal impact between multiple battery cells and reducing the phenomenon of heat spread in the box, so as to reduce the risk of fire and explosion of the battery device during use.

[0028] In some embodiments, the thermal conductivity of the heat-conducting element is λ3, which satisfies 50W / (m·K)≤λ3≤5000W / (m·K).

[0029] In the above technical solution, by setting the thermal conductive component to a structure with a thermal conductivity of 50 W / (m·K) to 5000 W / (m·K), the thermal conductive component can play a better role in heat conduction between the two heat insulation parts. This is beneficial to improving the efficiency of the thermal conductive component in transferring part of the heat that penetrates the heat insulation part to the thermal management component for heat exchange. This can further reduce the thermal impact between multiple battery cells and reduce the phenomenon of heat accumulation in the box. In this way, it can reduce the risk of heat spread and temperature rise inside the battery device, thereby improving the service life and reliability of the battery device.

[0030] In some embodiments, the heat-conducting member includes a body portion and an extension portion; the body portion is disposed between two heat-insulating portions in the second direction; the extension portion is connected to the body portion, the extension portion protrudes from one side of the body portion in the second direction, and the extension portion is located at one end of the heat-insulating portion near the thermal management component in the first direction, and the extension portion is connected to the thermal management component.

[0031] In the above technical solution, by setting the heat-conducting component to include a main body located between two heat-insulating parts and an extension connected to the main body, the extension is located in a first direction at the end of the heat-insulating part near the thermal management component and connected to the thermal management component, thereby reducing the assembly difficulty between the heat-conducting component and the thermal management component, which is beneficial to improving the assembly efficiency of the battery device. Furthermore, by setting the extension to a structure that protrudes from one side of the main body in a second direction, the connection area and contact area between the extension and the thermal management component can be increased, thereby increasing the heat exchange area between the heat-conducting component and the thermal management component, thereby improving the heat exchange effect between the heat-conducting component and the thermal management component, which is beneficial to mitigating the risk of heat spreading or continuously accumulating in the box.

[0032] In some embodiments, the extension extends along the second direction between the battery cell and the thermal management component.

[0033] In the above technical solution, by setting the extension to extend between the battery cell and the thermal management component in the second direction, it is beneficial to further increase the connection area and contact area between the extension and the thermal management component, thereby further improving the heat exchange area between the heat-conducting component and the thermal management component, so as to further improve the heat exchange effect between the heat-conducting component and the thermal management component, and further alleviate the risk of heat spreading or continuously accumulating in the box.

[0034] In some embodiments, the heat-conducting member includes a plurality of extensions, all of which are connected to the body portion; wherein, along the second direction, in two adjacent battery cells, at least one of the battery cells located on one side of the body portion is provided with an extension between the battery cell and the thermal management component, and at least one of the battery cells located on the other side of the body portion is provided with an extension between the battery cell and the thermal management component.

[0035] In the above technical solution, by setting multiple extensions on the heat-conducting component, and in each of two adjacent battery cells, at least one extension is provided between the two battery cells and the thermal management component, it is possible to further increase the heat exchange area between the heat-conducting component and the thermal management component, while also ensuring that the assembly height of the two adjacent battery cells in the first direction is the same, which is beneficial to improving the assembly quality of multiple battery cells in the housing.

[0036] In some embodiments, along the second direction, the extension does not extend beyond the surface of the corresponding battery cell on the side opposite to the body portion.

[0037] In the above technical solution, by setting the extension of the heat-conducting component to a structure that does not extend beyond the surface of the corresponding battery cell on the side away from the body of the heat-conducting component in the second direction, the interference between the extension and other components can be reduced, and the assembly difficulty between multiple battery cells and the extension can be reduced.

[0038] In some embodiments, the heat-conducting element is made of metal; wherein, an insulating layer is provided on the extension, and at least a portion of the insulating layer is located between the battery cell and the extension in the first direction to insulate and isolate the battery cell and the extension.

[0039] In the above technical solution, by providing an insulating layer on the extension of the heat-conducting component made of metal, and at least a portion of the insulating layer being located between the battery cell and the extension in a first direction, the insulating layer can achieve insulation isolation between the battery cell and the extension of the heat-conducting component, which helps to reduce the risk of electrical conduction or short circuit between the battery cell and the heat-conducting component, thereby improving the reliability of the battery device.

[0040] In some embodiments, the insulating layer covers the outside of the extension.

[0041] In the above technical solution, by setting the insulating layer as a structure covering the outside of the extension, the insulating layer can further improve the insulating isolation effect between the extension and the battery cell, thereby further reducing the risk of electrical conduction or short circuit between the battery cell and the heat-conducting component, and can achieve insulation isolation between the extension and other components.

[0042] In some embodiments, along the first direction, the extension is connected to one end of the body portion near the thermal management component.

[0043] In the above technical solution, by setting the extension to be connected to the end of the main body near the thermal management component in the first direction, the extension is located at the end of the heat insulation part near the thermal management component in the first direction. This helps to reduce the manufacturing difficulty of the heat-conducting component and the assembly difficulty between the heat-conducting component, the heat insulation component, and the thermal management component, thereby effectively improving the production efficiency of the battery device.

[0044] In some embodiments, along the first direction, an adhesive layer is provided between the thermal management component and the battery cell, the adhesive layer connecting the thermal management component and the battery cell.

[0045] In the above technical solution, by setting an adhesive layer between the thermal management component and the battery cell, and bonding the thermal management component and the battery cell together, the assembly connection between the battery cell and the thermal management component can be realized. This can improve the assembly stability of the battery cell when it is assembled into the housing. On the one hand, it can alleviate the phenomenon of shaking or displacement of the battery cell during use, thereby reducing the risk of impact to the battery cell. On the other hand, it can improve the contact reliability between the battery cell and the thermal management component, thereby improving the heat exchange stability between the thermal management component and the battery cell. This is beneficial to reducing the risk of internal temperature rise in the battery device during use.

[0046] In some embodiments, the thermal conductive member includes a body portion and an extension portion, the body portion being disposed between two of the thermal insulation portions in the second direction, the extension portion being connected to the body portion, and the extension portion extending along the second direction to the space between the battery cell and the thermal management component; wherein, the adhesive layer connects the extension portion and the thermal management component.

[0047] In the above technical solution, the heat-conducting component is provided with an extension extending between the battery cell and the thermal management component. The extension is also connected to the thermal management component through an adhesive layer. This not only increases the heat exchange area between the heat-conducting component and the thermal management component, but also improves the connection reliability between the extension and the thermal management component. This enables the extension and the thermal management component to maintain good contact during use, which is beneficial to improving the heat exchange stability between the heat-conducting component and the thermal management component. This enhances the effect of the heat-conducting component in transferring some of the heat that penetrates the insulation part to the thermal management component for heat exchange.

[0048] In some embodiments, the extension has a first through hole in the region corresponding to the battery cell in the first direction, and the first through hole extends through the extension along the first direction; wherein a portion of the adhesive layer passes through the first through hole and connects the thermal management component and the battery cell.

[0049] In the above technical solution, by opening a first through hole in the extension along the first direction corresponding to the position of the battery cell, and the adhesive layer is a structure that connects the thermal management component and the battery cell after passing through the first through hole, the battery device with this structure can increase the bonding area between the adhesive layer and the battery cell, which is beneficial to improve the connection reliability between the battery cell and the thermal management component. On the other hand, it can improve the assembly reliability between the extension and the adhesive layer, thereby improving the assembly stability of the extension connected between the battery cell and the thermal management component through the adhesive layer.

[0050] In some embodiments, in a projection plane perpendicular to the first direction, the orthographic projection of the hole wall of the first through hole lies within the orthographic projection of the battery cell.

[0051] In the above technical solution, by setting the projection of the hole wall surface of the first through hole in the first direction to a structure located inside the battery cell, the area where the first through hole is set in the extension is a structure that is only set in the first direction corresponding to the battery cell. This avoids the phenomenon of waste caused by the opening area of ​​the first through hole being too large. In this way, the connection reliability between the battery cell and the thermal management component, as well as between the extension and the thermal management component, can be improved, while the phenomenon of excessive reduction in the contact area between the extension and the thermal management component can also be reduced.

[0052] In some embodiments, the battery cell includes a housing and an insulating member, the housing having a first outer surface facing the thermal management component in the first direction, and at least a portion of the insulating member being connected to the first outer surface; wherein the insulating member is provided with a second through hole, the second through hole penetrating the insulating member along the first direction, and a portion of the adhesive layer passing through the first through hole and the second through hole and connecting the thermal management component and the first outer surface.

[0053] In the above technical solution, an insulating component is provided on the first outer surface of the battery cell's casing facing the thermal management component in the first direction. This insulating component can insulate and isolate the first outer surface from the thermal management component or its extension, thereby reducing the risk of short circuit between the battery cell and other components. By providing a second through hole on the insulating component, and having the adhesive layer pass through the first and second through holes and connect the thermal management component and the first outer surface, the adhesive layer can be made to directly contact and bond with the battery cell's casing. This improves the bonding quality between the battery cell and the adhesive layer, further enhancing the assembly stability between the battery cell and the thermal management component.

[0054] In some embodiments, in a projection plane perpendicular to the first direction, the orthographic projection of the hole wall of the second through hole is located inside the orthographic projection of the hole wall of the first through hole.

[0055] In the above technical solution, by setting the projection of the hole wall surface of the second through hole in the first direction to be located inside the first through hole, the opening area of ​​the second through hole is smaller than that of the first through hole, and the extension and the outer shell are separated by an insulating component. This can alleviate the phenomenon of direct overlap between the extension and the outer shell at the second through hole, and help reduce the risk of electrical conduction or short circuit between the battery cell and the extension.

[0056] Secondly, embodiments of this application also provide an electrical device, including the battery device described above. Attached Figure Description

[0057] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0059] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0060] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0061] Figure 4 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application;

[0062] Figure 5 This is an assembly diagram of the heat insulation and heat conduction components of a battery device provided in some embodiments of this application;

[0063] Figure 6 A partial structural schematic diagram of a battery device provided for some embodiments of this application;

[0064] Figure 7 A front view of a battery cell facing a first outer surface in a first direction, provided for some embodiments of this application;

[0065] Figure 8 A front view in a first direction of a battery cell and an extension after assembly and connection according to some embodiments of this application.

[0066] Icons: 1000 - Vehicle; 100 - Battery unit; 10 - Housing; 11 - First housing body; 12 - Second housing body; 20 - Thermal management component; 30 - Heat insulation component; 31 - Heat insulation section; 40 - Heat conduction component; 41 - Body section; 42 - Extension section; 421 - Insulating layer; 422 - First through hole; 50 - Battery cell; 51 - Housing; 511 - First outer surface; 52 - Electrode terminal; 53 - Insulating component; 531 - Second through hole; 60 - Separator layer; 70 - Adhesive layer; 200 - Controller; 300 - Motor; X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0068] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0069] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0070] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0071] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0072] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0073] In this application, "multiple" means two or more (including two).

[0074] 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.

[0075] 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 the embodiments of this application are not limited to this.

[0076] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0077] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0078] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0079] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0080] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0081] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0082] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0083] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0084] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0085] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0086] In some implementations, the electrode assembly has a stacked structure.

[0087] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0088] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0089] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0090] As an example, a battery cell 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, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0091] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0092] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0093] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0094] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0095] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0096] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0097] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0098] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0099] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0100] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0101] For typical battery devices, to increase energy density and achieve high power output, multiple battery cells are usually stacked within the battery housing. However, these cells generate significant heat during continuous charging and discharging. To mitigate the heat spread within the battery housing, heat insulation pads are typically placed between adjacent cells to reduce heat exchange. While these pads offer some insulation, their efficiency is limited. To meet the insulation requirements between adjacent cells, further measures are needed. The need to increase the thickness of the heat insulation pad results in lower internal space utilization of the battery pack, which severely impacts the energy density. If the heat insulation pad is insufficiently thick, some heat will still dissipate or spread, potentially affecting adjacent battery cells and causing heat to accumulate inside the pack. This leads to an increase in the internal temperature of the battery pack, and the stacked structure of multiple battery cells exacerbates this phenomenon. Consequently, the performance and lifespan of the battery pack are severely affected, and there is even a risk of fire or explosion during use. Therefore, it is impossible to simultaneously improve the energy density, lifespan, and reliability of the battery pack.

[0102] Based on the above considerations, in order to solve the problem of the inability to simultaneously achieve high energy density and reliable operation in a battery device, this application provides a battery device including a housing, a thermal management component, a heat insulation component, a heat-conducting component, and multiple battery cells. The multiple battery cells are housed within the housing. The thermal management component is located on one side of all the battery cells in a first direction and is configured to manage the temperature of the battery cells. The heat insulation component is disposed between two adjacent battery cells along a second direction, and includes two heat-insulating portions arranged along the second direction, which is perpendicular to the first direction. At least a portion of the heat-conducting component is disposed between the two heat-insulating portions in the second direction, and the heat-conducting component is connected to the thermal management component.

[0103] In this battery device structure, a heat insulation element is provided between two adjacent battery cells in the second direction. The heat insulation element includes two heat-insulating portions arranged along the second direction, enabling it to provide heat insulation between adjacent battery cells and reduce thermal impact and heat spread between multiple battery cells. A heat-conducting element is positioned at least partially between the two heat-insulating portions and connected to a thermal management component. This results in the heat-conducting element being sandwiched between the two heat-insulating portions of the heat insulation element. The heat insulation element and the heat-conducting element, arranged between adjacent battery cells, cooperate to form a composite structure, allowing the heat-conducting element to transfer some of the heat penetrating the heat insulation portions to the thermal management component for heat exchange. By removing heat that the insulation cannot block, it helps to further reduce the thermal impact and heat spread between multiple battery cells. Therefore, it is not necessary to increase the thickness of the insulation to improve the insulation effect between multiple battery cells. This allows the insulation and heat conduction components with this composite structure to achieve good insulation effect without increasing the spacing between two adjacent battery cells. This helps to improve the utilization of the internal space of the battery device and effectively alleviate the phenomenon of heat spread or continuous accumulation in the box, thereby reducing the risk of fire and explosion during the use of the battery device. In this way, it can improve the lifespan and reliability of the battery device while taking into account the energy density of the battery device.

[0104] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be composed of the battery device disclosed in this application. This helps to improve the utilization of the internal space of the battery device while mitigating the problem of heat spread and accumulation within the battery compartment during use, thus balancing the energy density and reliability of the battery device.

[0105] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0106] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0107] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0108] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0109] According to some embodiments of this application, refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery cell 50 provided in some embodiments of this application. Figure 4 This is a partial structural schematic diagram of the battery device 100 provided in some embodiments of this application. Figure 5 This is a schematic diagram illustrating the assembly of the heat insulation element 30 and the heat conduction element 40 of a battery device 100 provided in some embodiments of this application. Embodiments of this application provide a battery device 100, which includes a housing 10, a thermal management component 20, a heat insulation element 30, a heat conduction element 40, and a plurality of battery cells 50. The plurality of battery cells 50 are housed within the housing 10. The thermal management component 20 is located on one side of all the battery cells 50 in a first direction X, and is configured to manage the temperature of the battery cells 50. The heat insulation element 30 is disposed between two adjacent battery cells 50 along a second direction Y, and includes two heat insulation portions 31 arranged along the second direction Y, which is perpendicular to the first direction X. At least a portion of the heat conduction element 40 is disposed between the two heat insulation portions 31 in the second direction Y, and the heat conduction element 40 is connected to the thermal management component 20.

[0110] The housing 10 provides assembly space for the battery cell 50, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 50. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0111] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0112] In the battery device 100, the multiple battery cells 50 housed within the housing 10 can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration means that the multiple battery cells 50 are connected in both series and parallel configurations. The multiple battery cells 50 can be directly connected in series, parallel, or in a hybrid configuration, and then the entire assembly of the multiple battery cells 50 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 50 first connected in series, parallel, or in a hybrid configuration to form a battery module, and then the multiple battery modules are connected in series, parallel, or in a hybrid configuration to form a whole, which is then housed within the housing 10.

[0113] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 50 to achieve electrical connection between the multiple battery cells 50.

[0114] In this embodiment of the application, the battery cell 50 may include a housing 51 and an electrode assembly (not shown in the figure). The electrode assembly is housed in the housing 51. Correspondingly, the battery cell 50 may also include an electrode terminal 52, which is mounted on the housing 51 and electrically connected to the electrode assembly to realize the input or output of electrical energy of the battery cell 50.

[0115] For example, the battery cell 50 includes two electrode terminals 52 with opposite polarities, both of which are electrically connected to an electrode assembly to facilitate the input or output of electrical energy into or out of the battery cell 50.

[0116] In some embodiments, the battery cell 50 may further include an insulating element 53, which is a structure covering the outer surface of the housing 51 to insulate and isolate the battery cell 50 from other components, thereby reducing the risk of leakage and short circuit of the battery cell 50.

[0117] For example, the insulating element 53 is bonded to the outer surface of the housing 51, and the insulating element 53 is an insulating film covering the outer surface of the housing 51. Optionally, the insulating element 53 can be made of various materials, such as plastic, rubber or silicone.

[0118] Each battery cell 50 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 50 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 50 has a rectangular structure.

[0119] For example, in this embodiment of the application, multiple battery cells 50 are arranged in a manner within the housing 10, that is, the battery device 100 includes multiple rows of battery cells 50, which are arranged along a third direction Z. Each row of battery cells 50 includes multiple battery cells 50 stacked along a second direction Y. Correspondingly, the multiple battery cells 50 are located on one side of the thermal management component 20 in the first direction X, that is, the battery cells 50 and the thermal management component 20 are arranged along the first direction X. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. Optionally, the first direction X is the height direction of the battery cell 50, the second direction Y is the thickness direction of the battery cell 50, and the third direction Z is the length direction of the battery cell 50.

[0120] In this embodiment, the thermal management component 20 is used to contain the heat exchange medium, thereby enabling heat exchange with the battery cell 50 to manage the temperature of the battery cell 50.

[0121] Optionally, the thermal management component 20 may have internally formed channels for the flow of a heat exchange medium to achieve heat exchange with the battery cell 50. Correspondingly, the heat exchange medium may be a gas, such as air or hydrogen, or a liquid, such as water, a brine solution, or liquid nitrogen. Of course, in other embodiments, the thermal management component 20 may also have internally formed cavities to accommodate the heat exchange medium to achieve heat exchange with the battery cell 50. Correspondingly, the heat exchange medium may also be a solid, such as paraffin wax. The heat exchange function can be achieved through the phase change of the heat exchange medium. For example, when paraffin wax changes from solid to liquid, it can absorb heat to achieve the effect of cooling the battery cell 50.

[0122] In this embodiment of the application, the heat insulation member 30 is disposed between two adjacent battery cells 50 along the second direction Y. Correspondingly, the heat insulation member 30 plays a role in heat insulation between two adjacent battery cells 50 to reduce the thermal impact between the two adjacent battery cells 50.

[0123] The heat insulation component 30 includes two heat insulation portions 31 arranged along the second direction Y. That is, the heat insulation component 30 has two parts arranged along the second direction Y, namely two heat insulation portions 31, and the thickness direction of the two heat insulation portions 31 is also the second direction Y. It should be noted that the two heat insulation portions 31 can be a separate structure, that is, the two heat insulation portions 31 are two independent components and are arranged at intervals along the second direction Y. Of course, the two heat insulation portions 31 can also be an integrally formed structure. Correspondingly, the two heat insulation portions 31 are two heat insulation portions 31 stacked along the second direction Y after the heat insulation component 30 is folded in half, that is, the two heat insulation portions 31 are interconnected.

[0124] Alternatively, the material of the heat insulation component 30 may be an aerogel layer or a porous vacuum silicone layer, etc.

[0125] In this embodiment of the application, at least a portion of the heat-conducting element 40 is disposed between two heat-insulating portions 31 in the second direction Y, and the heat-conducting element 40 is connected to the thermal management component 20. That is, at least a portion of the heat-conducting element 40 is sandwiched between two heat-insulating portions 31 of the heat-insulating element 30 in the second direction Y, and the heat-conducting element 40 is connected to the thermal management component 20 so that the heat-conducting element 40 can transfer the heat penetrating the heat-insulating portion 31 to the thermal management component 20 for heat exchange.

[0126] It should be noted that the heat-conducting component 40 and the thermal management component 20 can be directly connected or indirectly connected through other components.

[0127] The heat-conducting component 40 includes a body portion 41 and an extension portion 42 connected to each other. The body portion 41 is disposed between two heat-insulating portions 31 in the second direction Y, that is, the two heat-insulating portions 31 are respectively located on both sides of the body portion 41 in the second direction Y, and the thickness direction of the body portion 41 and the thickness direction of the heat-insulating portions 31 are both in the second direction Y. The extension portion 42 is located on the outside of the two heat-insulating portions 31, that is, the extension portion 42 is located on one side of the heat-insulating portions 31 in the first direction X, and the extension portion 42 is connected to the thermal management component 20.

[0128] Optionally, the heat-conducting component 40 can be made of metal, such as gold, silver, copper, aluminum or iron, or non-metallic materials, such as aluminum nitride, boron carbide, silicon carbide, deionized boron, diamond or graphene.

[0129] In this embodiment, a heat insulation member 30 is provided between two adjacent battery cells 50 in the second direction Y, and the heat insulation member 30 includes two heat insulation portions 31 arranged along the second direction Y, so that the heat insulation member 30 can play a heat insulation role between two adjacent battery cells 50, thereby reducing the heat influence and heat spread between multiple battery cells 50. At least a portion of the heat-conducting member 40 is disposed between the two heat insulation portions 31, and the heat-conducting member 40 is connected to the thermal management component 20, making the heat-conducting member 40 a structure sandwiched between the two heat insulation portions 31 of the heat insulation member 30. The heat insulation member 30 and the heat-conducting member 40 disposed between two adjacent battery cells 50 cooperate to form a composite structure, so that the heat-conducting member 40 can transfer a portion of the heat penetrating the heat insulation portion 31 to the thermal management component 20 for heat treatment. Heat exchange removes heat that the insulation component 30 cannot block, which helps to further reduce the thermal impact and heat spread between multiple battery cells 50. Therefore, it is not necessary to increase the thickness of the insulation component 30 to improve the insulation effect between multiple battery cells 50. This allows the insulation component 30 and the heat conductor 40 with this composite structure to achieve good insulation effect without increasing the distance between two adjacent battery cells 50. This helps to improve the utilization rate of the internal space of the battery device 100 and effectively alleviate the phenomenon of heat spread or continuous accumulation in the housing 10, thereby reducing the risk of fire and explosion of the battery device 100 during use. In this way, the lifespan and reliability of the battery device 100 can be improved while taking into account the energy density of the battery device 100.

[0130] According to some embodiments of this application, see Figure 4 and Figure 5 As shown, along the second direction Y, the heat-conducting member 40 includes a body portion 41 located between two heat-insulating portions 31, and the body portion 41 and the heat-insulating portions 31 are stacked and connected.

[0131] The main body 41 is the part of the heat-conducting element 40 located between the two heat-insulating parts 31 in the second direction Y. The main body 41 and the heat-insulating parts 31 are stacked and connected, that is, the thickness direction of the main body 41 and the thickness direction of the heat-insulating parts 31 are both the second direction Y.

[0132] Alternatively, the connection structure between the body part 41 and the heat insulation part 31 can be various, such as adhesive bonding or heat fusion bonding.

[0133] In this embodiment, by setting the body portion 41 of the heat-conducting element 40 located between the two heat-insulating portions 31 as a structure that is stacked and connected to the two heat-insulating portions 31, on the one hand, the assembly compactness and assembly stability of the heat-insulating element 30 and the heat-conducting element 40 can be improved, which is beneficial to saving the space occupied by the heat-insulating element 30 and the heat-conducting element 40. On the other hand, the contact area between the heat-insulating element 30 and the heat-conducting element 40 can be increased, which is beneficial to improving the effect of the heat-conducting element 40 in transferring part of the heat penetrating the heat-insulating portion 31 to the heat management component 20 for heat exchange.

[0134] In some embodiments, the body portion 41 and the heat insulation portion 31 are bonded together.

[0135] For example, the body part 41 and the heat insulation part 31 are bonded together by structural adhesive. Optionally, the structural adhesive can be made of epoxy resin, polyurethane resin, amine compound, etc.

[0136] In this embodiment, by setting the body part 41 and the heat insulation part 31 to an adhesive connection, it is beneficial to reduce the assembly difficulty between the body part 41 and the heat insulation part 31, and to improve the assembly reliability and contact area between the body part 41 and the heat insulation part 31.

[0137] According to some embodiments of this application, see Figure 5 As shown, along the second direction Y, the total thickness of the body part 41 and the two heat insulation parts 31 after being stacked is D1, which satisfies 0.5mm≤D1≤5mm.

[0138] The total thickness of the main body 41 and the two heat insulation parts 31 after being stacked in the second direction Y is D1. That is, D1 is the thickness dimension of the overall structure formed by stacking and connecting the main body 41 and the two heat insulation parts 31 in the second direction Y in the second direction Y.

[0139] For example, the total thickness D1 of the body portion 41 and the two heat insulation portions 31 after being stacked in the second direction Y can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm or 5mm, etc.

[0140] In this embodiment, by setting the total thickness of the main body 41 and the two heat insulation parts 31 stacked in the second direction Y to 0.5mm to 5mm, on the one hand, it can alleviate the phenomenon of poor heat insulation effect caused by insufficient thickness of the heat insulation part 30 and the heat conduction part 40, thereby reducing the risk of heat influence and heat spread between multiple battery cells 50. On the other hand, it can alleviate the phenomenon of excessive space occupied by the heat insulation part 30 and the heat conduction part 40, thereby reducing the distance between two adjacent battery cells 50 and improving the energy density of the battery device 100.

[0141] In some embodiments, see Figure 5 As shown, along the second direction Y, the thickness of the heat insulation part 31 is D2, which satisfies 0.1≤D2 / D1≤0.8. That is, the thickness of the heat insulation part 31 in the second direction Y can be 10% to 80% of the overall structure formed by the body part 41 and the two heat insulation parts 31 being stacked and connected in the second direction Y.

[0142] It should be noted that the thickness of the two insulation parts 31 can be the same or different.

[0143] For example, D2 / D1 can be 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8, etc.

[0144] In this embodiment, by setting the thickness of the heat insulation portion 31 to 0.1 to 0.8 of the total thickness of the body portion 41 and the two heat insulation portions 31 stacked in the second direction Y, the thickness ratio of the heat insulation portion 31 can be increased to improve the heat insulation effect of the heat insulation portion 31. On the other hand, it can alleviate the phenomenon that the thickness of the body portion 41 of the heat conductor 40 is insufficient due to the excessive thickness occupied by the heat insulation portion 31. This can improve the effect of the heat conductor 40 in transferring part of the heat penetrating the heat insulation portion 31 to the thermal management component 20 for heat exchange, thereby improving the heat insulation effect of the composite structure formed by the heat insulation portion 30 and the heat conductor 40 between two adjacent battery cells 50.

[0145] In some embodiments, please continue to see Figure 5 As shown, along the second direction Y, the thickness of the heat insulation part 31 is D2, and the thickness of the body part 41 is D3, satisfying 0.01≤D3 / D2≤0.5.

[0146] For example, D3 / D2 can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.35, 0.38, 0.4, 0.42, 0.45, 0.48, or 0.5, etc.

[0147] In this embodiment, on the one hand, the thickness of the body portion 41 of the heat-conducting component 40 is set to be greater than or equal to 0.01 of the thickness of the heat insulation portion 31, which is beneficial to increase the thickness ratio of the body portion 41 of the heat-conducting component 40. This can improve the effect of the heat-conducting component 40 in transferring part of the heat penetrating the heat insulation portion 31 to the thermal management component 20 for heat exchange. On the other hand, the thickness of the body portion 41 of the heat-conducting component 40 is set to be less than or equal to 0.5 of the thickness of the heat insulation portion 31, so as to alleviate the phenomenon that the thickness of the heat insulation portion 31 is too small due to the excessive thickness of the body portion 41 or the excessive total thickness of the body portion 41 and the two heat insulation portions 31 after being stacked in the second direction Y. This can improve the heat insulation effect between two adjacent battery cells 50 while taking into account the energy density of the battery device 100.

[0148] According to some embodiments of this application, see Figure 4 and Figure 5 As shown, along the first direction X, a partition layer 60 is provided at the end of the heat insulation part 31 away from the thermal management component 20, and the partition layer 60 connects the two heat insulation parts 31. The main body part 41 is located on the side of the partition layer 60 facing the thermal management component 20 in the first direction X.

[0149] Along the first direction X, a partition layer 60 is provided at the end of the heat insulation part 31 away from the thermal management component 20, and the partition layer 60 connects the two heat insulation parts 31. That is, the partition layer 60 and the thermal management component 20 are respectively located at the two ends of the heat insulation part 31 in the first direction X, so that the heat insulation part 31 is a structure located between the partition layer 60 and the thermal management component 20 in the first direction X, and both heat insulation parts 31 are connected to the partition layer 60.

[0150] The main body 41 is located on the side of the partition layer 60 facing the thermal management component 20 in the first direction X, that is, the main body 41 is also a structure located between the partition layer 60 and the thermal management component 20 in the first direction X.

[0151] It should be noted that, in this embodiment of the application, the separator 60 is a sealant disposed on one end of the heat insulation part 31, and the separator 60 is an insulating and heat-insulating material, so that the separator 60 can play a good role in insulating and heat-insulating while sealing and separating one end of the main body part 41. For example, the material of the separator 60 can be polyurethane, acrylic or epoxy resin, etc.

[0152] In this embodiment, by connecting the two heat insulation parts 31 to the end away from the thermal management component 20 in the first direction X with the partition layer 60, and the main body part 41 is disposed on the side of the partition layer 60 facing the thermal management component 20 in the first direction X, the partition layer 60 can play a certain role in separating and shielding the main body part 41 of the heat-conducting component 40. On the one hand, the partition layer 60 can play a certain role in protecting the heat-conducting component 40, thereby reducing the risk of bumping the heat-conducting component 40 during use. On the other hand, it can reduce the phenomenon of heat transfer within the housing 10 after the main body part 41 of the heat-conducting component 40 overlaps with other components, thereby facilitating the heat-conducting component 40 to transfer heat to the thermal management component 20 for heat exchange, thereby further reducing the risk of heat spreading within the housing 10.

[0153] In some embodiments, see Figure 5 As shown, in a projection plane perpendicular to the first direction X, the orthographic projection of the body portion 41 lies within the orthographic projection of the partition layer 60. That is, the partition layer 60 is a structure that covers the body portion 41 of the heat-conducting member 40 in the first direction X.

[0154] In this embodiment, by setting the projection of the main body 41 in the first direction X as a structure located within the partition layer 60, it is beneficial to further improve the separation effect of the partition layer 60 on the main body 41 of the heat-conducting component 40, thereby further improving the protection effect of the partition layer 60 on the heat-conducting component 40, further reducing the risk of impact to the heat-conducting component 40 during use, and further reducing the phenomenon of heat transfer within the housing 10 after the main body 41 of the heat-conducting component 40 overlaps with other components. This facilitates the heat-conducting component 40 to transfer heat to the thermal management component 20 for heat exchange, further reducing the risk of heat spread within the housing 10.

[0155] In some embodiments, please continue to see Figure 5 As shown, the partition layer 60 is connected to the main body 41, that is, both heat insulation parts 31 and the main body 41 of the heat conduction element 40 are connected to the partition layer 60.

[0156] In this embodiment, by connecting the main body 41 and the partition layer 60 to each other, the partition layer 60 is structured to connect the main body 41 and the two heat insulation parts 31, thereby further improving the connection reliability and assembly stability of the main body 41 and the two heat insulation parts 31.

[0157] In some embodiments, the thermal conductivity of the separator 60 is λ1, which satisfies 0.01W / (m·K)≤λ1≤0.5W / (m·K).

[0158] For example, the thermal conductivity λ1 of the separator 60 can be 0.01 W / (m·K), 0.02 W / (m·K), 0.03 W / (m·K), 0.04 W / (m·K), 0.05 W / (m·K), 0.06 W / (m·K), 0.07 W / (m·K), 0.08 W / (m·K), 0.09 W / (m·K), 0.1 W / (m·K), 0.12 W / (m·K), 0.15 W / (m·K), 0. .18W / (m·K), 0.2W / (m·K), 0.22W / (m·K), 0.25W / (m·K), 0.28W / (m·K), 0.3W / (m·K), 0.32W / (m·K), 0 .35W / (m·K), 0.38W / (m·K), 0.4W / (m·K), 0.42W / (m·K), 0.45W / (m·K), 0.48W / (m·K) or 0.5W / (m·K), etc.

[0159] In this embodiment, by setting the partition layer 60 to a structure with a thermal conductivity of 0.01 W / (m·K) to 0.5 W / (m·K), the partition layer 60 has a good heat insulation effect. Thus, the partition layer 60 can also play a heat insulation role at the end of the body part 41 of the heat conductor 40 away from the heat management component 20 along the first direction X, so as to reduce the phenomenon of heat being released from the end of the body part 41 of the heat conductor 40 away from the heat management component 20 into the box 10, thereby further reducing the risk of heat spread in the box 10.

[0160] According to some embodiments of this application, see Figure 4 and Figure 5 As shown, the two heat insulation parts 31 are separately arranged and spaced apart along the second direction Y. That is, the two heat insulation parts 31 are two independent components and are not directly connected to each other.

[0161] Of course, in other embodiments, the two heat insulation parts 31 can also be integrally formed, that is, the two heat insulation parts 31 are formed by folding the heat insulation member 30 to form two heat insulation parts 31 stacked along the second direction Y.

[0162] In this embodiment, by setting the heat insulation part 31 as a separate part and arranged at intervals along the second direction Y, the difficulty of setting the heat conduction member 40 between the two heat insulation parts 31 can be reduced, and the manufacturing difficulty of the separator can be reduced, thereby reducing the manufacturing difficulty of the battery device 100 and improving the production efficiency of the battery device 100.

[0163] According to some embodiments of this application, the thermal conductivity of the heat insulation element 30 is λ2, which satisfies 0.003W / (m·K)≤λ2≤0.1W / (m·K).

[0164] For example, the thermal conductivity λ2 of the insulation element 30 can be 0.003 W / (m·K), 0.004 W / (m·K), 0.005 W / (m·K), 0.006 W / (m·K), 0.007 W / (m·K), 0.008 W / (m·K), 0.009 W / (m·K), 0.01 W / (m·K), 0.02 W / (m·K), 0.03 W / (m·K), 0.04 W / (m·K), 0.05 W / (m·K), 0.06 W / (m·K), 0.07 W / (m·K), 0.08 W / (m·K), 0.09 W / (m·K), or 0.1 W / (m·K), etc.

[0165] In this embodiment, by setting the heat insulation component 30 to a structure with a thermal conductivity of 0.003 W / (m·K) to 0.1 W / (m·K), the heat insulation component 30 can play a good heat insulation effect between two adjacent battery cells 50, thereby reducing the thermal impact between multiple battery cells 50 and reducing the phenomenon of heat spreading in the housing 10, so as to reduce the risk of fire and explosion of the battery device 100 during use.

[0166] According to some embodiments of this application, the thermal conductivity of the heat-conducting element 40 is λ3, which satisfies 50W / (m·K)≤λ3≤5000W / (m·K).

[0167] For example, the thermal conductivity λ3 of the heat-conducting element 40 can be 50 W / (m·K), 60 W / (m·K), 70 W / (m·K), 80 W / (m·K), 90 W / (m·K), 100 W / (m·K), 200 W / (m·K), 300 W / (m·K), 400 W / (m·K), 500 W / (m·K), 600 W / (m·K), 700 W / (m·K). W / (m·K), 800W / (m·K), 900W / (m·K), 1000W / (m·K), 1500W / (m·K), 2000W / (m·K), 2500W / (m·K), 3000W / (m·K), 3500W / (m·K), 4000W / (m·K), 4500W / (m·K) or 5000W / (m·K), etc.

[0168] In this embodiment, by setting the thermal conductive element 40 to a structure with a thermal conductivity of 50 W / (m·K) to 5000 W / (m·K), the thermal conductive element 40 can play a better role in heat conduction between the two heat insulation parts 31. This is beneficial to improving the efficiency of the thermal conductive element 40 in transferring part of the heat that penetrates the heat insulation part 31 to the thermal management component 20 for heat exchange. This can further reduce the thermal impact between multiple battery cells 50 and reduce the phenomenon of heat accumulation in the housing 10. In this way, the risk of heat spread and temperature rise inside the battery device 100 can be reduced, thereby improving the service life and reliability of the battery device 100.

[0169] According to some embodiments of this application, see Figure 4 and Figure 5 As shown, the heat-conducting component 40 may include a body portion 41 and an extension portion 42. The body portion 41 is disposed between two heat-insulating portions 31 in the second direction Y. The extension portion 42 is connected to the body portion 41, protruding from one side of the body portion 41 in the second direction Y, and the extension portion 42 is located at the end of the heat-insulating portion 31 near the thermal management component 20 in the first direction X, and the extension portion 42 is connected to the thermal management component 20.

[0170] The main body 41 is the portion of the heat-conducting element 40 disposed between the two heat-insulating portions 31 in the second direction Y, while the extension portion 42 is the portion of the heat-conducting element 40 located outside the heat-insulating portion 31 in the first direction X, and the main body 41 and the extension portion 42 are interconnected.

[0171] For example, the thickness direction of the body portion 41 is the second direction Y, and correspondingly, the extension portion 42 is a structure that extends along the second direction Y, such that the thickness direction of the extension portion 42 is the first direction X.

[0172] Optionally, the main body 41 and the extension 42 are integrally formed, or they can be separate but connected. For example, in the embodiment of this application, the main body 41 and the extension 42 are integrally formed, and the extension 42 is connected to one end of the main body 41 in the first direction X, so that the main body 41 and the extension 42 are formed by bending the heat-conducting member 40, so that the heat-conducting member 40 has an L-shaped cross section in the third direction Z perpendicular to the third direction.

[0173] The extension 42 is located at the end of the heat insulation part 31 near the thermal management component 20 in the first direction X, that is, the extension 42 is located between the heat insulation part 31 and the thermal management component 20 in the first direction X, so that the extension 42 and the heat insulation part 31 are arranged along the first direction X.

[0174] The extension 42 is connected to the thermal management component 20. That is, the part where the heat-conducting component 40 and the thermal management component 20 are connected is the extension 42 of the heat-conducting component 40. Optionally, the extension 42 and the thermal management component 20 can be directly connected or indirectly connected.

[0175] In this embodiment, by configuring the heat-conducting component 40 as including a body portion 41 located between two heat-insulating portions 31 and an extension portion 42 connected to the body portion 41, the extension portion 42 is located at one end of the heat-insulating portion 31 near the thermal management component 20 in the first direction X and is connected to the thermal management component 20, thereby reducing the assembly difficulty between the heat-conducting component 40 and the thermal management component 20, which is beneficial to improving the assembly efficiency of the battery device 100. Furthermore, by configuring the extension portion 42 as a structure that protrudes from one side of the body portion 41 in the second direction Y, the connection area and contact area between the extension portion 42 and the thermal management component 20 can be increased, thereby increasing the heat exchange area between the heat-conducting component 40 and the thermal management component 20, thereby improving the heat exchange effect between the heat-conducting component 40 and the thermal management component 20, which is beneficial to mitigating the risk of heat spreading or continuously accumulating in the housing 10.

[0176] According to some embodiments of this application, in conjunction with Figure 4 and Figure 5 As shown, along the second direction Y, the extension 42 extends between the battery cell 50 and the thermal management component 20. That is, at least a portion of the extension 42 is a structure located between the corresponding battery cell 50 and the thermal management component 20 in the first direction X.

[0177] In this embodiment, by setting the extension 42 to extend in the second direction Y between the battery cell 50 and the thermal management component 20, it is beneficial to further increase the connection area and contact area between the extension 42 and the thermal management component 20, thereby further improving the heat exchange area between the heat conductor 40 and the thermal management component 20, so as to further improve the heat exchange effect between the heat conductor 40 and the thermal management component 20, and further alleviate the risk of heat spreading or continuously accumulating in the housing 10.

[0178] According to some embodiments of this application, refer to Figure 6 As shown, Figure 6This is a partial structural schematic diagram of a battery device 100 provided in some embodiments of this application. The heat-conducting element 40 may include a plurality of extensions 42, all of which are connected to the body portion 41. Along the second direction Y, in two adjacent battery cells 50, at least one extension 42 is provided between the battery cell 50 located on one side of the body portion 41 and the thermal management component 20, and at least one extension 42 is provided between the battery cell 50 located on the other side of the body portion 41 and the thermal management component 20. That is, at least two of the plurality of extensions 42 connected to the body portion 41 extend from the body portion 41 in opposite directions along the second direction Y to the space between the corresponding battery cell 50 and the thermal management component 20.

[0179] In this embodiment, by providing multiple extensions 42 on the heat-conducting component 40, and by providing at least one extension 42 between each of the two adjacent battery cells 50 and the thermal management component 20, it is possible to further increase the heat exchange area between the heat-conducting component 40 and the thermal management component 20, while also ensuring that the assembly height of the two adjacent battery cells 50 is the same in the first direction X, which is beneficial to improving the assembly quality of multiple battery cells 50 in the housing 10.

[0180] According to some embodiments of this application, see Figure 4 as well as Figure 6 As shown, along the second direction Y, the extension 42 does not extend beyond the surface of the corresponding battery cell 50 on the side opposite to the main body 41. That is, the end of the extension 42 away from the main body 41 in the second direction Y is located between the corresponding battery cell 50 and the thermal management component 20 in the first direction X.

[0181] In this embodiment, by setting the extension 42 of the heat-conducting member 40 to not extend beyond the surface of the corresponding battery cell 50 on the side away from the body portion 41 of the heat-conducting member 40 in the second direction Y, the interference between the extension 42 and other components can be reduced, and the assembly difficulty between multiple battery cells 50 and the extension 42 can be reduced.

[0182] According to some embodiments of this application, the heat-conducting element 40 is made of metal, combined with... Figure 4 and Figure 5 As shown, an insulating layer 421 is provided on the extension 42, and at least a portion of the insulating layer 421 is located between the battery cell 50 and the extension 42 in the first direction X, so as to insulate and isolate the battery cell 50 and the extension 42.

[0183] The heat-conducting component 40 is made of metal, and the material of the heat-conducting component 40 can be gold, silver, copper, aluminum or iron, etc.

[0184] An insulating layer 421 is provided on the extension 42, and at least a portion of the insulating layer 421 is located between the battery cell 50 and the extension 42 in the first direction X. That is, the outer surface of the extension 42 is coated with the insulating layer 421, and the insulating layer 421 has a structure in which at least a portion is located on the side of the extension 42 facing the battery cell 50 in the first direction X, so that the insulating layer 421 can play the role of insulating and isolating the battery cell 50 and the extension 42.

[0185] For example, the insulating layer 421 can be an organic insulating polymer, such as at least one of polyethylene, polypropylene and other polyolefins, polyethylene terephthalate, polyimide, polyethylene oxide, polyvinylidene fluoride and silicone rubber. Of course, the insulating layer 421 can also be an inorganic insulating material, such as at least one of alumina, silicon oxide, magnesium oxide and zirconium oxide.

[0186] In this embodiment, by providing an insulating layer 421 on the extension 42 of the heat-conducting component 40 made of metal, and at least a portion of the insulating layer 421 being located between the battery cell 50 and the extension 42 in the first direction X, the insulating layer 421 can achieve insulation isolation between the battery cell 50 and the extension 42 of the heat-conducting component 40, which helps to reduce the risk of electrical conduction or short circuit between the battery cell 50 and the heat-conducting component 40, thereby improving the reliability of the battery device 100.

[0187] In some embodiments, see Figure 5 As shown, the insulating layer 421 covers the outer side of the extension 42.

[0188] In this embodiment, by setting the insulating layer 421 to cover the outside of the extension 42, the insulating layer 421 can further improve the insulating isolation effect between the extension 42 and the battery cell 50, thereby further reducing the risk of electrical conduction or short circuit between the battery cell 50 and the heat conductor 40, and can achieve insulation isolation between the extension 42 and other components.

[0189] In some embodiments, see Figure 4 and Figure 5 As shown, along the first direction X, the extension 42 is connected to one end of the body portion 41 near the thermal management component 20, so that the heat conduction component 40 is L-shaped. Of course, in other embodiments, the extension 42 may also be a structure connected to the surface of one side of the body portion 41 in the second direction Y.

[0190] In this embodiment, by setting the extension 42 to be connected to the end of the main body 41 near the thermal management component 20 along the first direction X, the extension 42 is located at the end of the heat insulation part 31 near the thermal management component 20 in the first direction X. This helps to reduce the manufacturing difficulty of the heat conductor 40 and reduces the assembly difficulty between the heat conductor 40, the heat insulation part 30, and the thermal management component 20, thereby effectively improving the production efficiency of the battery device 100.

[0191] According to some embodiments of this application, see Figure 4 as well as Figure 6 As shown, along the first direction X, an adhesive layer 70 is provided between the thermal management component 20 and the battery cell 50, and the adhesive layer 70 connects the thermal management component 20 and the battery cell 50.

[0192] The adhesive layer 70 is disposed between the thermal management component 20 and the battery cell 50 to connect the thermal management component 20 and the battery cell 50. For example, the adhesive layer 70 can be made of various materials, such as epoxy resin, polyurethane resin or amine compound.

[0193] In this embodiment, by providing an adhesive layer 70 between the thermal management component 20 and the battery cell 50, and by bonding the thermal management component 20 and the battery cell 50 together, the assembly connection between the battery cell 50 and the thermal management component 20 is achieved. This improves the assembly stability of the battery cell 50 assembled into the housing 10. On the one hand, it can alleviate the phenomenon of shaking or displacement of the battery cell 50 during use, thereby reducing the risk of impact to the battery cell 50. On the other hand, it can improve the contact reliability between the battery cell 50 and the thermal management component 20, thereby improving the heat exchange stability between the thermal management component 20 and the battery cell 50. This helps to reduce the risk of internal temperature rise in the battery device 100 during use.

[0194] According to some embodiments of this application, in conjunction with Figure 4 and Figure 5 As shown, the heat-conducting component 40 may include a body portion 41 and an extension portion 42. The body portion 41 is disposed between two heat-insulating portions 31 in the second direction Y. The extension portion 42 is connected to the body portion 41 and extends along the second direction Y to the space between the battery cell 50 and the thermal management component 20. The adhesive layer 70 connects the extension portion 42 and the thermal management component 20.

[0195] The extension 42 extends between the battery cell 50 and the thermal management component 20, such that the extension 42 is at least partially embedded in the adhesive layer 70, and the adhesive layer 70 can also connect the extension 42 and the thermal management component 20.

[0196] In this embodiment, the heat-conducting component 40 is provided with an extension 42 extending between the battery cell 50 and the thermal management component 20. The extension 42 is also connected to the thermal management component 20 through the adhesive layer 70. This increases the heat exchange area between the heat-conducting component 40 and the thermal management component 20, while also improving the connection reliability between the extension 42 and the thermal management component 20. This ensures that the extension 42 and the thermal management component 20 maintain good contact during use, which is beneficial to improving the heat exchange stability between the heat-conducting component 40 and the thermal management component 20. This enhances the effect of the heat-conducting component 40 in transferring part of the heat that penetrates the heat insulation part 31 to the thermal management component 20 for heat exchange.

[0197] According to some embodiments of this application, in conjunction with Figure 4 and Figure 5 As shown, the extension 42 has a first through hole 422 in the first direction X corresponding to the area of ​​the battery cell 50, and the first through hole 422 extends through the extension 42 along the first direction X. A portion of the adhesive layer 70 passes through the first through hole 422 and connects the thermal management component 20 and the battery cell 50.

[0198] The extension 42 is provided with a first through hole 422 in the region corresponding to the battery cell 50 in the first direction X. That is, at least part of the projection of the battery cell 50 in the first direction X is located in the first through hole 422. The first through hole 422 is a structure that penetrates the surfaces of both sides of the extension 42 along the first direction X, so that the adhesive layer 70 can fill the first through hole 422 and pass through the first through hole 422 to connect the thermal management component 20 and the battery cell 50, as well as the extension 42 and the thermal management component 20.

[0199] It should be noted that the structure in which the insulating layer 421 is covered on the outside of the extension 42 can be a structure in which the first through hole 422 penetrates the region on both sides of the extension 42 along the first direction X through the insulating layer 421, or a structure in which the insulating layer 421 is also coated on the hole wall surface of the first through hole 422.

[0200] In this embodiment, by opening a first through hole 422 in the extension 42 at the position corresponding to the battery cell 50 along the first direction X, and by having part of the adhesive layer 70 pass through the first through hole 422 and connect the thermal management component 20 and the battery cell 50, the battery device 100 with this structure can increase the bonding area between the adhesive layer 70 and the battery cell 50, which is beneficial to improving the connection reliability between the battery cell 50 and the thermal management component 20. On the other hand, it can improve the assembly reliability between the extension 42 and the adhesive layer 70, thereby improving the assembly stability of the extension 42 connected between the battery cell 50 and the thermal management component 20 through the adhesive layer 70.

[0201] In some embodiments, in a projection plane perpendicular to the first direction X, the orthographic projection of the hole wall of the first through hole 422 lies within the orthographic projection of the battery cell 50. That is, the battery cell 50 has a structure that covers the first through hole 422 in the first direction X.

[0202] In this embodiment, by setting the projection of the hole wall surface of the first through hole 422 in the first direction X as a structure located within the battery cell 50, the area where the extension 42 is provided with the first through hole 422 is a structure that is only provided in the first direction X corresponding to the battery cell 50. This avoids the phenomenon of the first through hole 422 being too large and thus being wasted. In this way, the connection reliability between the battery cell 50 and the thermal management component 20, as well as between the extension 42 and the thermal management component 20, can be improved, while also reducing the phenomenon of excessive reduction in the contact area between the extension 42 and the thermal management component 20.

[0203] According to some embodiments of this application, refer to Figure 3 and Figure 5 Please refer to further details. Figure 7 and Figure 8 , Figure 7 This is a front view of a battery cell 50 provided in some embodiments of this application, facing the first outer surface 511 in the first direction X. Figure 8 This is a front view of the battery cell 50 and extension 42 after assembly in a first direction X, according to some embodiments of this application. The battery cell 50 may include a housing 51 and an insulator 53. The housing 51 has a first outer surface 511 facing the thermal management component 20 in the first direction X. At least a portion of the insulator 53 is connected to the first outer surface 511. The insulator 53 is provided with a second through hole 531 that penetrates the insulator 53 along the first direction X. A portion of the adhesive layer 70 passes through the first through hole 422 and the second through hole 531 and connects the thermal management component 20 and the first outer surface 511.

[0204] Wherein, the first outer surface 511 is the outer surface of the outer shell 51 of the battery cell 50 facing a wall of the thermal management component 20 in the first direction X. Correspondingly, at least a portion of the insulating member 53 is connected to the first outer surface 511, that is, the first outer surface 511 is a structure that is at least partially covered by the insulating member 53. In the embodiments of this application, the insulating member 53 is an insulating film covering the outside of the outer shell 51 of the battery cell 50. For example, the material of the insulating member 53 can be silicone, rubber or plastic, etc.

[0205] The second through hole 531 is a structure that is disposed on the insulating member 53 and penetrates the insulating member 53. The second through hole 531 is a structure that is disposed on the region of the insulating member 53 corresponding to the first outer surface 511 in the first direction X. That is, at least a portion of the projection of the first outer surface 511 in the first direction X is located in the first through hole 422.

[0206] Along the first direction X, a portion of the adhesive layer 70 passes through the first through hole 422 and the second through hole 531 and connects the thermal management component 20 and the first outer surface 511. That is, the first through hole 422 is filled with a portion of the adhesive layer 70, and the second through hole 531 is also filled with a portion of the adhesive layer 70. The portion of the adhesive layer 70 passing through the second through hole 531 is a structure connected to the first surface of the outer casing 51.

[0207] In this embodiment, an insulating member 53 is provided on the first outer surface 511 of the outer casing 51 of the battery cell 50 facing the thermal management component 20 in the first direction X. The insulating member 53 can insulate and isolate the first outer surface 511 from the thermal management component 20 or the extension 42, thereby reducing the risk of short circuit between the battery cell 50 and other components. By providing a second through hole 531 on the insulating member 53, and by having part of the adhesive layer 70 pass through the first through hole 422 and the second through hole 531 and connect the thermal management component 20 and the first outer surface 511, part of the adhesive layer 70 can be in direct contact with and bonded to the outer casing 51 of the battery cell 50. This improves the bonding quality between the battery cell 50 and the adhesive layer 70, thereby further improving the assembly stability between the battery cell 50 and the thermal management component 20.

[0208] In some embodiments, see Figure 8 As shown, in a projection plane perpendicular to the first direction X, the orthographic projection of the wall surface of the second through hole 531 is located inside the orthographic projection of the wall surface of the first through hole 422. That is, the area defined by the projection of the wall surface of the second through hole 531 in the first direction X is a structure located within the first through hole 422, such that in a projection plane perpendicular to the first direction X, the orthographic projection of the wall surface of the first through hole 422 is a structure surrounding the outside of the orthographic projection of the wall surface of the second through hole 531.

[0209] In this embodiment, by setting the projection of the hole wall surface of the second through hole 531 in the first direction X to be located inside the first through hole 422, the opening area of ​​the second through hole 531 is smaller than the opening area of ​​the first through hole 422, and the extension 42 and the outer shell 51 are separated by the insulating member 53. This can alleviate the phenomenon of the extension 42 and the outer shell 51 directly overlapping at the second through hole 531, and help reduce the risk of electrical conduction or short circuit between the battery cell 50 and the extension 42.

[0210] According to some embodiments of this application, this application also provides an electrical device, which includes a battery device 100 of any of the above schemes, and the battery device 100 is used to provide electrical energy to the electrical device.

[0211] The electrical device can be any of the aforementioned devices or systems that utilize battery device 100.

[0212] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0213] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized by, include: Box; Multiple battery cells are housed within the housing; A thermal management component is located on one side of all the battery cells in a first direction, and the thermal management component is configured to manage the temperature of the battery cells; A heat insulation component is disposed between two adjacent battery cells along a second direction, and the heat insulation component includes two heat insulation portions arranged along the second direction, the second direction being perpendicular to the first direction; as well as A heat-conducting element is disposed at least partially between the two heat-insulating portions in the second direction, and the heat-conducting element is connected to the thermal management component.

2. The battery device according to claim 1, characterized by Along the second direction, the heat-conducting element includes a body portion located between the two heat-insulating portions, the body portion and the heat-insulating portions being stacked and connected.

3. The battery device of claim 2, wherein The main body and the heat insulation part are bonded together.

4. The battery device of claim 2, wherein Along the second direction, the total thickness of the body and the two heat insulation parts after being stacked is D1, which satisfies 0.5mm≤D1≤5mm.

5. The battery device of claim 4, wherein Along the second direction, the thickness of the heat insulation part is D2, which satisfies 0.1≤D2 / D1≤0.

8.

6. The battery device of claim 4, wherein Along the second direction, the thickness of the heat insulation part is D2, and the thickness of the body part is D3, satisfying 0.01≤D3 / D2≤0.

5.

7. The battery device of claim 2, wherein Along the first direction, a partition layer is provided at the end of the heat insulation part away from the thermal management component, and the partition layer connects the two heat insulation parts; The main body is located on the side of the partition layer facing the thermal management component in the first direction.

8. The battery device of claim 7, wherein, In a projection plane perpendicular to the first direction, the orthographic projection of the main body is located within the orthographic projection of the partition layer.

9. The battery device according to claim 7, characterized in that, The partition layer is connected to the main body.

10. The battery device of claim 7, wherein, The thermal conductivity of the separator is λ1, which satisfies 0.01W / (m·K)≤λ1≤0.5W / (m·K).

11. The battery device of claim 1, wherein The two heat insulation components are disposed and arranged at intervals along the second direction.

12. The battery device of claim 1, wherein, The thermal conductivity of the insulation component is λ2, which satisfies 0.003W / (m·K)≤λ2≤0.1W / (m·K).

13. The battery device of claim 1, wherein, The thermal conductivity of the heat-conducting component is λ3, which satisfies 50W / (m·K)≤λ3≤5000W / (m·K).

14. The battery device of any one of claims 1-13, wherein, The heat-conducting component includes: The main body is disposed between the two heat insulation portions in the second direction; An extension is connected to the main body, the extension protrudes from one side of the main body in the second direction, and the extension is located at the end of the heat insulation portion near the thermal management component in the first direction, the extension being connected to the thermal management component.

15. The battery device of claim 14, wherein, Along the second direction, the extension extends between the battery cell and the thermal management component.

16. The battery device of claim 15, wherein, The heat-conducting component includes a plurality of the extensions, all of which are connected to the main body. In the second direction, among two adjacent battery cells, at least one extension is provided between one battery cell located on one side of the body portion and the thermal management component, and at least one extension is provided between one battery cell located on the other side of the body portion and the thermal management component.

17. The battery device of claim 15, wherein, Along the second direction, the extension does not extend beyond the surface of the corresponding battery cell on the side opposite to the body portion.

18. The battery device of claim 15, wherein, The heat-conducting component is made of metal. The extension is provided with an insulating layer, and at least a portion of the insulating layer is located between the battery cell and the extension in the first direction to insulate and isolate the battery cell and the extension.

19. The battery device of claim 18, wherein, The insulating layer covers the outside of the extension.

20. The battery device of claim 14, wherein, Along the first direction, the extension is connected to one end of the body portion near the thermal management component.

21. The battery device of any one of claims 1-13, wherein, Along the first direction, an adhesive layer is provided between the thermal management component and the battery cell, the adhesive layer connecting the thermal management component and the battery cell.

22. The battery device of claim 21, wherein, The heat-conducting component includes a body portion and an extension portion. The body portion is disposed between the two heat-insulating portions in the second direction. The extension portion is connected to the body portion and extends along the second direction to the space between the battery cell and the thermal management component. The adhesive layer connects the extension and the thermal management component.

23. The battery device of claim 22, wherein, The extension has a first through hole in the region corresponding to the battery cell in the first direction, and the first through hole penetrates the extension along the first direction; The adhesive layer passes through the first through hole and connects the thermal management component and the battery cell.

24. The battery device of claim 23, wherein, In a projection plane perpendicular to the first direction, the orthographic projection of the hole wall of the first through hole lies within the orthographic projection of the battery cell.

25. The battery device of claim 23, wherein, The battery cell includes a housing and an insulating component. The housing has a first outer surface facing the thermal management component in the first direction, and at least a portion of the insulating component is connected to the first outer surface. The insulating component is provided with a second through hole. Along the first direction, the second through hole penetrates the insulating component, and a portion of the adhesive layer passes through the first through hole and the second through hole and connects the thermal management component and the first outer surface.

26. The battery device of claim 25, wherein, In a projection plane perpendicular to the first direction, the orthographic projection of the wall surface of the second through hole is located inside the orthographic projection of the wall surface of the first through hole.

27. An electrical device, comprising: Includes the battery device as described in any one of claims 1-26.

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