Battery and electric device

Abstract

The utility model provides a battery and a power utilization device, the battery comprises a plurality of battery monomers and a first heat insulation part, and the plurality of battery monomers are stacked along a first direction; the first heat insulation part is positioned between two adjacent battery monomers in the first direction, and the thickness of the first heat insulation part is less than 1mm; the first heat insulation piece comprises a first heat insulation layer and a first phase change layer, the first heat insulation layer is attached to the first phase change layer, and the ratio of the surface area to the volume of the first phase change layer is 10: 1-100: 1. The thickness of the first heat insulation piece is smaller than 1 mm, the occupied size is small, and the size requirement can be met. The first heat insulation piece comprises a first heat insulation layer and a first phase change layer, has the heat insulation capacity and the heat absorption capacity, and can meet the heat diffusion safety protection requirement under the limit design. The first phase change layer is thin-film-shaped, the ratio of the surface area to the volume is high, and the heat exchange efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery and an electrical device. Background Art

[0002] With the development of new energy technologies, batteries are used more and more widely, such as in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric airplanes and power tools.

[0003] As the design of high-volume energy density batteries becomes increasingly limited, some related thermal insulation pads are unable to meet the thermal diffusion safety protection requirements. Utility Model Content

[0004] In view of the above problems, the present application provides a battery and an electrical device, wherein the first thermal insulation component of the battery can insulate and absorb heat by phase change, which is beneficial to heat diffusion safety protection.

[0005] In a first aspect, some embodiments of the present application provide a battery comprising a battery cell and a first thermal insulation member; a plurality of battery cells are stacked along a first direction; the first thermal insulation member is located between two adjacent battery cells in the first direction, and the thickness of the first thermal insulation member is less than 1 mm; the first thermal insulation member comprises a first thermal insulation layer and a first phase change layer, the first thermal insulation layer is bonded to the first phase change layer, and the surface area to volume ratio of the first phase change layer is 10:1 to 100:1.

[0006] In the technical solution of the above embodiment, the first thermal insulation member is attached between the two battery cells in the first direction. The thickness of the first thermal insulation member is less than 1 mm, and the occupied volume is small, which can meet the size requirements. The first thermal insulation member includes a first thermal insulation layer and a first phase change layer. The first thermal insulation layer can insulate between the two battery cells. The first phase change layer can absorb heat when the battery cells reach the phase change temperature. It has both thermal insulation and heat absorption capabilities. When the battery cells diffuse heat, it can effectively block heat transfer and prevent heat from diffusing to adjacent battery cells, thereby meeting the thermal diffusion safety protection requirements under extreme design. The surface area to volume ratio of the first phase change layer is 10:1 to 100:1. It is in the form of a thin film with a high surface area to volume ratio, which is conducive to improving heat exchange efficiency.

[0007] In some embodiments of the present application, the battery comprises two first thermal insulation layers and a single first phase change layer. Along a first direction, the first phase change layer is bonded between the two first thermal insulation layers. The first thermal insulation member is bonded to the battery cell via the two first thermal insulation layers, partially blocking heat transfer, reducing heat transferred to the first phase change layer and increasing the service life of the first phase change layer.

[0008] In some embodiments of the present application, the battery comprises a single first thermal insulation layer and two first phase change layers. Along a first direction, the first thermal insulation layer is bonded between the two first phase change layers. The first thermal insulation member is bonded to the battery cell via the first phase change layer. When the battery cell reaches its phase change temperature, the first phase change layer undergoes a phase transition and absorbs heat, thereby directly reducing heat transfer.

[0009] According to the battery provided in some embodiments of the present application, the ratio of the thickness of the first thermal insulation layer to the thickness of the first phase change layer is 1:1 to 90:1, and the thermal insulation performance and heat absorption performance of the first thermal insulation component can be balanced according to needs.

[0010] According to the battery provided in some embodiments of the present application, the thickness of the first thermal insulation layer ranges from 0.1 mm to 0.9 mm, and the thickness can be selected according to actual working conditions, with a wide range of applications.

[0011] According to the battery provided in some embodiments of the present application, the thickness of the first phase change layer ranges from 0.01 mm to 0.1 mm, which is thin, flexible, light, and easier to fit into battery cells and suitable for various surface shapes.

[0012] In some embodiments of the present application, the battery comprises a first thermal insulation layer comprising a thermal insulation substrate and a thermal insulation packaging film, wherein the thermal insulation substrate is used for insulation and the thermal insulation packaging film is used to encapsulate the thermal insulation substrate. The first phase change layer comprises a phase change substrate and a phase change packaging film, wherein the phase change substrate is used for phase change and heat absorption and the phase change packaging film is used to encapsulate the phase change substrate. The first thermal insulation layer and the first phase change layer are separately packaged, providing good independence and facilitating production.

[0013] According to the battery provided in some embodiments of the present application, along the first direction, the laminated thermal insulation packaging film and the phase change packaging film are hot-melt-molded into one body, so that the first thermal insulation layer and the first phase change layer can be laminated more tightly.

[0014] According to the battery provided in some embodiments of the present application, the first thermal insulation member also includes an adhesive layer, which is located between the first thermal insulation layer and the first phase change layer, and bonds the first thermal insulation layer and the first phase change layer to improve the connection strength between the first thermal insulation layer and the first phase change layer.

[0015] According to the battery provided in some embodiments of the present application, the first thermal insulation layer uses a material with a thermal conductivity coefficient of less than 0.04 W / m·K. The first thermal insulation layer is one of a foam plastic layer, an aerogel layer, a vacuum insulation board layer, a cellulose layer, a glass wool layer, a rock wool layer, or a composite film layer thereof, which can take into account both lightness and thermal insulation performance.

[0016] According to the battery provided in some embodiments of the present application, the phase change temperature range of the first phase change layer is 25°C to 80°C. The first phase change layer is one of a paraffin layer, a fatty acid layer, a salt hydrate layer, a polymer phase change material layer, or a composite film layer thereof. When the temperature of the battery cell approaches or exceeds the ideal operating temperature, the phase change absorbs heat to maintain the ideal operating temperature of the battery cell.

[0017] In some embodiments of the present application, multiple battery cells are arranged side by side along the second direction; a first thermal insulator is positioned between two adjacent rows of battery cells; and the first and second directions are arranged perpendicularly. The battery can be directly integrated with the battery cells to increase volumetric energy density, and the first thermal insulator can insulate and absorb heat from the sides of the battery cells.

[0018] According to some embodiments of the present application, the battery further includes a battery module, wherein a plurality of battery modules are arranged side by side along a first direction and / or a second direction; the battery module includes a plurality of battery cells. The battery cells are first formed into a battery module, and the plurality of battery modules are then formed into a battery, facilitating battery assembly.

[0019] According to the batteries provided in some embodiments of the present application, a first thermal insulation member is provided between adjacent battery modules, which can separate and absorb heat between the battery modules, thereby achieving safety protection against heat diffusion between the battery modules.

[0020] According to some embodiments of the present application, a second thermal insulator is provided between adjacent battery modules. The second thermal insulator includes a second thermal insulation layer and a second phase change layer, each of which is multi-layered and alternately stacked. The surface area to volume ratio of the second phase change layer is 10:1 to 100:1. The second thermal insulator comprises multiple layers of the second thermal insulation layer and the second phase change layer, which improves thermal insulation and heat absorption capabilities. The high surface area to volume ratio of the second phase change layer contributes to improved heat exchange efficiency.

[0021] In a second aspect, some embodiments of the present application provide an electrical device, which includes the battery provided by the above technical solution.

[0022] The technical solutions provided by the embodiments of the present disclosure bring at least the following beneficial effects:

[0023] Some embodiments of the present application provide a battery and an electrical device, wherein the first thermal insulation member of the battery is less than 1 mm thick, occupies a small volume, and can meet size requirements. The first thermal insulation member includes a first thermal insulation layer and a first phase change layer, which has both thermal insulation and heat absorption capabilities. When the battery cell diffuses heat, it can effectively block heat transfer and prevent heat from diffusing to adjacent battery cells, thereby meeting the thermal diffusion safety protection requirements under extreme design. The surface area to volume ratio of the first phase change layer is 10:1 to 100:1, and it is in the form of a thin film. The high surface area to volume ratio is conducive to improving heat exchange efficiency.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. Throughout the accompanying drawings, the same reference numerals are used to denote the same components.

[0026] Figure 1 A simplified schematic diagram of a vehicle provided in some embodiments of the present application;

[0027] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0028] Figure 3 Schematic diagram of the structure of batteries provided in other embodiments of the present application;

[0029] Figure 4 A schematic diagram of stacking battery cells provided in some embodiments of the present application;

[0030] Figure 5 A schematic diagram of the positional relationship between a battery cell and a first thermal insulation member provided in some embodiments of the present application;

[0031] Figure 6 A cross-sectional view of a first thermal insulation member provided in some embodiments of the present application;

[0032] Figure 7 A cross-sectional view of a first thermal insulation member provided in some other embodiments of the present application;

[0033] Figure 8 A cross-sectional view of a first thermal insulation member provided in some other embodiments of the present application;

[0034] Figure 9 A cross-sectional view of a second thermal insulation component provided in some embodiments of the present application.

[0035] In the attached figure:

[0036] 1-Vehicle; 2-Controller; 3-Battery; 4-Motor;

[0037] 5-box; 5a-first box; 5b-second box; 5c-placement space;

[0038] 6 - battery cell; 7 - battery module; 8 - first thermal insulation member; 81 - first thermal insulation layer; 82 - first phase change layer; 9 - second thermal insulation member; 91 - second thermal insulation layer; 92 - second phase change layer;

[0039] X-first direction; Y-second direction. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0041] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0043] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0044] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0045] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0046] The battery cell 6 mentioned in the embodiment of the present application may be a secondary battery cell. A secondary battery cell refers to a battery cell 6 that can be continuously used by activating active materials by charging after the battery cell 6 is discharged.

[0047] The battery cell 6 may be an ion battery cell, including but not limited to a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a magnesium ion battery cell, and a calcium ion battery cell.

[0048] A battery cell 6 typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 6, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes and provides ion channels for the active ions to pass through.

[0049] In some embodiments, the battery cell 6 further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The electrolyte may be in liquid, gel, or solid form.

[0050] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0051] In some embodiments, the battery cell 6 may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0052] As an example, the battery cell 6 may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal batteries. Polygonal batteries are, for example, hexagonal batteries.

[0053] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 6 to provide higher voltage and capacity.

[0054] In some embodiments, the battery may be a battery module 7 . When there are multiple battery cells 6 , the multiple battery cells 6 are arranged and fixed to form a battery module 7 .

[0055] In some embodiments, the battery may be a battery pack, which includes a box body and battery cells 6 , wherein the battery cells 6 or battery modules 7 are housed in the box body.

[0056] In some embodiments, the box body can be used as part of the chassis structure of the vehicle 1. For example, part of the box body can become at least part of the floor of the vehicle 1, or part of the box body can become at least part of the cross member and longitudinal member of the vehicle 1.

[0057] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0058] As the design of high-volume energy density batteries becomes increasingly extreme, some related thermal insulation pads, while providing a certain degree of thermal diffusion safety protection, are relatively thick (greater than 1.2mm), resulting in low space utilization and difficulty meeting the thermal diffusion safety protection requirements under extreme design conditions. Some related thermal insulation pads (such as ultra-thin glass fiber aerogel insulation pads) are less than 1mm thick, but their thermal insulation performance cannot achieve the thermal diffusion-free performance required for high-volume energy density batteries.

[0059] In view of this, an embodiment of the present application provides a technical solution, wherein the battery includes a battery cell 6 and a first thermal insulation member 8. The thickness of the first thermal insulation member 8 is less than 1 mm, and the occupied volume is small, which can meet the size requirements. The first thermal insulation member 8 includes a first thermal insulation layer 81 and a first phase change layer 82, which have both thermal insulation and heat absorption capabilities, can effectively block heat transfer, thereby meeting the thermal diffusion safety protection requirements under extreme design. The surface area to volume ratio of the first phase change layer 82 is 10:1 to 100:1. The high surface area to volume ratio is conducive to improving heat exchange efficiency.

[0060] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries, which may be vehicles 1, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicle 1 may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and a new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. Spacecraft include aircraft, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0061] The battery described in the embodiments of the present application is not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0062] Please refer to Figure 1 , Figure 1 The following is a simplified schematic diagram of a vehicle provided in some embodiments of the present application. Vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery is provided inside the vehicle 1, and the battery can be provided at the bottom, head or tail of the vehicle 1. Battery 3 can be used to power the vehicle 1, for example, the battery can serve as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 2 and a motor 4, and the controller 2 is used to control the battery to power the motor 4, for example, for starting, navigating and operating power requirements of the vehicle 1 during driving.

[0063] In some embodiments of the present application, the battery 3 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0064] Please refer to Figure 2 and Figure 3 , Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application; Figure 3 Schematic diagram of the structure of batteries provided in other embodiments of the present application.

[0065] like Figure 2As shown, the battery 3 includes a housing and a battery cell 6, and the battery cell 6 is accommodated in the housing 5. The housing 5 is used to provide a storage space for the battery cell 6. There can be multiple battery cells 6 in the battery 3, and the multiple battery cells 6 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 6 are both connected in series and in parallel. The multiple battery cells 6 can be directly connected in series, in parallel, or in mixed connection, and then the whole composed of the multiple battery cells 6 is accommodated in the housing; of course, as shown in FIG. Figure 3 As shown, the battery 3 may also be a battery module 7 formed by connecting multiple battery cells 6 in series, in parallel or in hybrid connection, and then the multiple battery modules 7 are connected in series, in parallel or in hybrid connection to form a whole and accommodated in the box 5 .

[0066] The housing 5 may include a first housing 5a and a second housing 5b. The first housing 5a and the second housing 5b may overlap to define a storage space 5c for accommodating the battery cells 6. The first housing 5a and the second housing 5b may have various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first housing 5a may be a hollow structure with one side open, and the second housing 5b may also be a hollow structure with one side open. The open side of the second housing 5b overlaps the open side of the first housing 5a, thereby forming a housing with the storage space 5c.

[0067] The battery 3 may further include other structures. For example, the battery may further include a busbar component for achieving electrical connection between the plurality of battery cells 6 .

[0068] Please refer to Figures 4 to 9 ,in, Figure 4 A schematic diagram of stacking battery cells provided in some embodiments of the present application; Figure 5 A schematic diagram of the positional relationship between a battery cell and a first thermal insulation member provided in some embodiments of the present application; Figure 6 A cross-sectional view of a first thermal insulation member provided in some embodiments of the present application; Figure 7 A cross-sectional view of a first thermal insulation member provided in some other embodiments of the present application; Figure 8 A cross-sectional view of a first thermal insulation member provided in some other embodiments of the present application; Figure 9 A cross-sectional view of a second thermal insulation component provided in some embodiments of the present application.

[0069] First, as Figures 4 to 6 As shown, some embodiments of the present application provide a battery 3, including a battery cell 6 and a first thermal insulation member 8; a plurality of battery cells 6 are stacked along a first direction X; the first thermal insulation member 8 is located between two adjacent battery cells 6 in the first direction X, and the thickness of the first thermal insulation member 8 is less than 1 mm; the first thermal insulation member 8 includes a first thermal insulation layer 81 and a first phase change layer 82, the first thermal insulation layer 81 is bonded to the first phase change layer 82, and the surface area to volume ratio of the first phase change layer 82 is 10:1 to 100:1.

[0070] The battery cell 6 may be a square-shell battery cell 6 , and the side surface surrounded by the height and length of the square-shell battery cell 6 is perpendicular to the first direction X.

[0071] The first thermal insulation member 8 is attached between two adjacent battery cells 6 . The first thermal insulation member 8 may be a rectangular pad attached to two side surfaces of the battery cell 6 to provide insulation, isolation and buffering.

[0072] The surface area of ​​the first thermal insulation member 8 perpendicular to the first direction X may be greater than, less than, or equal to the surface area of ​​the battery cell 6 perpendicular to the first direction X.

[0073] Along the first direction X, the first thermal insulation layer 81 is attached to the first phase change layer 82 , and further, the battery cell 6 may be attached to either the first thermal insulation layer 81 or the first phase change layer 82 .

[0074] The surface area to volume ratio of the first phase change layer 82 is 10:1 to 100:1, and can be 10:1, 20:1, 30:1, 40:1, 50:1, 60:1, 70:1, 80:1, 90:1, 100:1, or any intermediate value between any two adjacent values.

[0075] In the technical solution of the above embodiment, the first thermal insulation member 8 is attached between the two battery cells 6 in the first direction X. The thickness of the first thermal insulation member 8 is less than 1 mm, and the volume occupied is small, which can meet the size requirements under the battery's extreme design. The first thermal insulation member 8 includes a first thermal insulation layer 81 and a first phase change layer 82. The first thermal insulation layer 81 can insulate between the two battery cells 6. The first phase change layer 82 can absorb heat by phase change when the battery cell 6 reaches the phase change temperature. It has both thermal insulation and heat absorption capabilities. When the battery cell 6 diffuses heat, it can effectively block heat transfer and prevent heat from diffusing to adjacent battery cells 6, thereby meeting the thermal diffusion safety protection requirements under extreme design. The first phase change layer 82 has a surface area to volume ratio of 10:1 to 100:1, is in the form of a thin film, and has a high surface area to volume ratio, which is conducive to improving heat exchange efficiency.

[0076] In some embodiments of the present application, Figure 7 As shown, the first thermal insulation layer 81 is composed of two layers, and the first phase change layer 82 is composed of one layer; along the first direction X, the first phase change layer 82 is attached between the two layers of the first thermal insulation layer 81 .

[0077] Along the first direction X, the first thermal insulation member 8 comprises, in order, a first thermal insulation layer 81, a first phase change layer 82, and a first thermal insulation layer 81. Two layers of first thermal insulation layers 81 are located on either side, sandwiching the first phase change layer 82. The thickness of the two first thermal insulation layers 81 can be the same or different. The surface area of ​​adjacent first phase change layers 82 and first thermal insulation layers 81 in contact can be the same or different.

[0078] In the technical solution of the above embodiment, the first thermal insulation member 8 is adhered to the battery cell 6 through two first thermal insulation layers 81 respectively. The first thermal insulation layer 81 can block part of the heat transfer, reduce the heat transferred to the first phase change layer 82, and thereby reduce the phase change amount and / or phase change frequency of the first phase change layer 82, thereby improving the service life of the first phase change layer 82.

[0079] In some embodiments of the present application, Figure 8 As shown, the first heat insulation layer 81 is one layer, and the first phase change layer 82 is two layers; along the first direction X, the first heat insulation layer 81 is attached between the two first phase change layers 82.

[0080] Along the first direction X, the first thermal insulation member 8 comprises, in order, a first phase change layer 82, a first thermal insulation layer 81, and a first phase change layer 82. Two first phase change layers 82 are located on opposite sides of the first thermal insulation layer 81, sandwiching the first thermal insulation layer 81. The thickness of the two first phase change layers 82 can be the same or different. The surface area of ​​adjacent first phase change layers 82 and first thermal insulation layers 81 in contact can be the same or different.

[0081] In the technical solution of the above embodiment, the first thermal insulation member 8 is adhered to the battery cell 6 through the first phase change layer 82. When the battery cell 6 reaches the phase change temperature, the first phase change layer 82 can phase change (for example, from solid to liquid) to absorb heat, thereby directly reducing the heat transferred to the first thermal insulation layer 81 and reducing the heat load of the first thermal insulation layer.

[0082] In some embodiments of the present application, the ratio of the thickness of the first thermal insulation layer 81 to the thickness of the first phase change layer 82 is 1:1 to 90:1.

[0083] Optionally, the ratio of the thickness of the first thermal insulation layer 81 to the thickness of the first phase change layer 82 can be 1:1, 10:1, 20:1, 30:1, 40:1, 50:1, 60:1, 70:1, 80:1, or 90:1, or any intermediate value between any two adjacent values, such as 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, or 9:1. The thickness of the first thermal insulation layer 81 is not less than the thickness of the first phase change layer 82.

[0084] In the technical solution of the above embodiment, the ratio of the thickness of the first thermal insulation layer 81 to the thickness of the first phase change layer 82 can be selected to balance the thermal insulation and heat absorption performance of the first thermal insulation member 8 as required. The thickness of the first thermal insulation layer 81 is not less than the thickness of the first phase change layer 82, which can improve the thermal insulation performance of the first thermal insulation member 8.

[0085] In some embodiments of the present application, the thickness of the first thermal insulation layer 81 ranges from 0.1 mm to 0.9 mm.

[0086] Along the first direction X, the thickness of the first thermal insulation layer 81 is consistent at all locations. The thickness of the first thermal insulation layer 81 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or any intermediate value between any two adjacent values ​​mentioned above.

[0087] In the technical solution of the above embodiment, the thickness of the first heat insulation layer 81 can be designed according to actual working conditions such as the expected heat generation and temperature value of the battery cell 6, and has a wide range of applications.

[0088] In some embodiments of the present application, the thickness of the first phase change layer 82 ranges from 0.01 mm to 0.1 mm.

[0089] Along the first direction X, the thickness of the first phase change layer 82 is consistent at all locations. The thickness of the first phase change layer 82 can be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, or any intermediate value between any two adjacent values ​​mentioned above.

[0090] In the technical solution of the above embodiment, the thickness of the first phase change layer 82 does not exceed 0.1 mm. It is thin, flexible, and lightweight, making it easier to adhere to the battery cell 6 and suitable for various surface shapes of the battery cell 6. When combined with the first thermal insulation layer 81, the first phase change layer 82 further enhances the protective effect without increasing the thickness, weight, or volume.

[0091] In some embodiments of the present application, the first thermal insulation layer 81 includes a thermal insulation substrate and a thermal insulation packaging film; the first phase change layer 82 includes a phase change substrate and a phase change packaging film.

[0092] The thermal insulation packaging film is placed around the outside of the thermal insulation substrate to encapsulate the thermal insulation substrate, providing thermal insulation. The phase change packaging film is placed around the outside of the phase change substrate to encapsulate the phase change substrate, allowing the phase change substrate to undergo a phase change within the film and absorb heat. The thickness of the thermal insulation packaging film and / or the phase change packaging film can be in the micrometer range.

[0093] On a plane perpendicular to the first direction X, the projected area of ​​the thermal insulation packaging film can be the same as the projected area of ​​the thermal insulation substrate, that is, the thermal insulation packaging film is encapsulated along the edge of the thermal insulation substrate; the projected area of ​​the thermal insulation packaging film can also be slightly larger than the projected area of ​​the thermal insulation substrate.

[0094] On a plane perpendicular to the first direction X, the projected area of ​​the phase change packaging film can be the same as the projected area of ​​the phase change substrate, that is, the phase change packaging film is encapsulated along the edge of the phase change substrate; the projected area of ​​the phase change packaging film can also be slightly larger than the projected area of ​​the phase change substrate.

[0095] In the technical solution of the above embodiment, the first thermal insulation layer 81 and the first phase change layer 82 are separately encapsulated. Firstly, they are independent, allowing the first thermal insulation layer 81 and the first phase change layer 82 to function independently, particularly preventing the first phase change layer 82 from intruding into the first thermal insulation layer 81 during phase change. Secondly, during production, the first thermal insulation layer 81 and the first phase change layer 82 can form a composite layer, facilitating processing and manufacturing.

[0096] In some embodiments of the present application, along the first direction X, the heat-insulating packaging film and the phase-change packaging film that are bonded to each other are hot-melt-molded into one piece.

[0097] Hot melt is used as a hot melt connection, and the contact surface of the thermal insulation packaging film and the phase change packaging film is melted by heating, and then cooled and solidified under pressure.

[0098] In the technical solution of the above embodiment, the first thermal insulation layer 81 and the first phase change layer 82 are combined into one by a hot melt process, which can achieve close fitting between the first thermal insulation layer 81 and the first phase change layer 82 and improve the consistency of the performance of the first thermal insulation component 8 at various locations in the first direction X.

[0099] In some embodiments of the present application, the first thermal insulation member 8 further includes an adhesive layer, which is located between the first thermal insulation layer 81 and the first phase change layer 82 and bonds the first thermal insulation layer 81 and the first phase change layer 82 .

[0100] Optionally, the adhesive layer may be double-sided tape with a thickness of less than 10 microns. When the adhesive layer is bonded to the first thermal insulation layer 81, it may be bonded to the entire surface in contact with the first thermal insulation layer 81, or it may be bonded to a portion of the surface in contact with the first thermal insulation layer 81. When the adhesive layer is bonded to the first phase change layer 82, it may be bonded to the entire surface in contact with the first phase change layer 82, or it may be bonded to a portion of the surface in contact with the first phase change layer 82.

[0101] In the technical solution of the above embodiment, by providing an adhesive layer between the first thermal insulation layer 81 and the first phase change layer 82 , the connection strength between the first thermal insulation layer 81 and the first phase change layer 82 can be improved.

[0102] In some embodiments of the present application, the first insulation layer 81 is made of a material with a thermal conductivity of less than 0.04 W / m·K. The insulation base material of the first insulation layer 81 includes any one or a combination of foam plastics, aerogel, vacuum insulation panel, cellulose, glass wool, rock wool.

[0103] Optionally, the thermal insulation substrate layer may be a foam plastic layer, an aerogel layer, a vacuum insulation board layer, a cellulose layer, a glass wool layer, a rock wool layer, or a composite film layer thereof.

[0104] Optionally, when the first thermal insulation layer 81 is multi-layered, the thermal insulation materials of the thermal insulation substrates of different layers can be the same or different. The substrate of the same first thermal insulation layer 81 can be a single thermal insulation material or a combination of multiple thermal insulation materials.

[0105] Optionally, the foam plastic may be polyurethane foam, polystyrene foam, etc.; the aerogel may be ceramic fiber aerogel, glass fiber aerogel, etc.

[0106] In the technical solution of the above embodiment, the first thermal insulation layer 81 is made of a material with a thermal conductivity coefficient below 0.04W / m·K, which can take into account both lightness and thermal insulation performance, and improve the thermal insulation performance while meeting the battery's maximum design size requirements.

[0107] In some embodiments of the present application, the phase change temperature range of the first phase change layer 82 is 25°C to 80°C, and the first phase change layer 82 is one of a paraffin layer, a fatty acid layer, a salt hydrate layer, a polymer phase change material layer, or a composite film layer thereof.

[0108] The first phase-change layer 82 is a thin, flexible phase-change cold storage membrane. When the temperature rises to near the phase-change temperature, it changes from solid to liquid, absorbing heat. When the temperature drops to near the phase-change temperature, it changes from liquid to solid. Throughout the phase-change process, the material's temperature fluctuates little, forming a relatively stable temperature platform, which is particularly beneficial for maintaining a constant temperature environment.

[0109] When the battery cell 6 is a lithium-ion battery cell 6 , the ideal operating temperature is 25° C. to 52° C., and the phase change temperature range of the first phase change layer 82 is 25° C. to 80° C., which is close to or exceeds the ideal operating temperature of the battery cell 6 .

[0110] The phase change temperature of the first phase change layer 82 can be 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, or any intermediate value between any two adjacent values ​​above, such as 51°C, 52°C, 53°C, 54°C.

[0111] Optionally, when the first phase change layer 82 is multi-layered, the phase change substrates of different first phase change layers 82 can be the same or different. The phase change substrate of the same first phase change layer 82 can be a single phase change material or a combination of multiple phase change materials. The polymer phase change material can be polyethylene glycol, a polymer, or the like.

[0112] In the technical solution of the above embodiment, the first phase change layer 82 can undergo phase change and absorb heat when the battery cell 6 approaches or exceeds the ideal operating temperature, thereby maintaining an ideal operating environment for the battery cell 6 .

[0113] In some embodiments of the present application, Figure 2 As shown, a plurality of battery cells 6 are arranged side by side along the second direction Y; the first thermal insulation member 8 is located between two adjacent rows of battery cells 6; and the first direction X and the second direction Y are arranged perpendicularly.

[0114] In the first direction X, the plurality of battery cells 6 are stacked and arranged; in the second direction Y, the plurality of battery cells 6 are arranged side by side, and the battery is integrated by the plurality of battery cells 6 .

[0115] Between two adjacent rows of battery cells 6, the first thermal insulation member 8 may be fitted in its entirety; or there may be multiple first thermal insulation members 8, with one first thermal insulation member 8 arranged between every two battery cells 6; or multiple first thermal insulation members 8 may be arranged end to end along the first direction X between two adjacent rows of battery cells 6.

[0116] In the technical solution of the above embodiment, the battery is directly integrated with the battery cells 6, which can improve the volume energy density of the battery. The first thermal insulation member 8 is arranged between two adjacent rows of battery cells 6, which can insulate and absorb heat on the side of the battery cells 6.

[0117] In some embodiments of the present application, Figure 3 As shown, it also includes a battery module 7 , and multiple battery modules 7 are arranged side by side along the first direction X and / or the second direction Y; the battery module 7 includes multiple battery cells 6 .

[0118] The battery cells 6 can first be combined into battery modules 7, and then multiple battery modules 7 can be assembled into a battery 3. The multiple battery modules 7 are arranged side by side in the battery, and can be arranged side by side along the first direction X, along the second direction Y, or along both the first direction X and the second direction Y.

[0119] In the technical solution of the above embodiment, a plurality of battery cells 6 are first assembled into a battery module 7 , and then the plurality of battery modules 7 are assembled into a battery, which can facilitate assembly operations during the production process of the battery 3 .

[0120] In some embodiments of the present application, a first thermal insulation member 8 is provided between adjacent battery modules 7 .

[0121] The first thermal insulation member 8 is disposed between adjacent battery modules 7 and is in contact with corresponding surfaces (part of the side surfaces or all of the side surfaces) of the battery modules 7. It may cover the corresponding surfaces of the entire battery module or partially cover the corresponding surfaces of the battery module.

[0122] In the technical solution of the above embodiment, a first thermal insulation member 8 is provided between adjacent battery modules 7. The first thermal insulation member 8 can isolate and absorb heat among the battery modules 7, thereby realizing safety protection of heat diffusion between the battery modules.

[0123] In some embodiments of the present application, Figure 3 and Figure 9 As shown, a second thermal insulation member 9 is provided between adjacent battery modules 7; the second thermal insulation member 9 includes a second thermal insulation layer 91 and a second phase change layer 92, and the second thermal insulation layer 91 and the second phase change layer 92 are both multi-layered and alternately stacked; the surface area to volume ratio of the second phase change layer 92 is 10:1 to 100:1.

[0124] The thickness of the second thermal insulation layer 91 can be the same as or different from the thickness of the first thermal insulation layer 81. The material of the second thermal insulation layer 91 can be the same as or different from the material of the first thermal insulation layer 81. The thickness of the second phase change layer 92 can be the same as or different from the thickness of the first phase change layer 82. The material of the second phase change layer 92 can be the same as or different from the material of the first phase change layer 82.

[0125] Optionally, the second thermal insulation layer 91 is the same as the first thermal insulation layer 81 (thickness and material), and the second phase change layer 92 is the same as the first phase change layer 82 (thickness and material), which can improve interchangeability.

[0126] In the technical solution of the above embodiment, the second thermal insulation member 9 includes multiple layers of second thermal insulation layer 91 and second phase change layer 92, which can enhance the thermal insulation and heat absorption capabilities and improve the heat exchange efficiency.

[0127] In a second aspect, some embodiments of the present application provide an electrical device, which includes a battery provided by any of the above embodiments, and the battery is used to provide electrical energy.

[0128] The electrical device provided in the embodiment of the present application has all the beneficial effects of the battery in any embodiment of the first aspect described above. For details, please refer to the specific description of the battery in the above embodiments, and this embodiment will not be repeated here.

[0129] The embodiment of the present application provides a battery 3, comprising a battery cell 6 and a first thermal insulation member 8; a plurality of battery cells 6 are stacked along a first direction X; the first thermal insulation member 8 is located between two adjacent battery cells 6 in the first direction X, and the thickness of the first thermal insulation member 8 is less than 1 mm; the first thermal insulation member 8 comprises a first thermal insulation layer 81 and a first phase change layer 82, the first thermal insulation layer 81 is bonded to the first phase change layer 82, and the surface area to volume ratio of the first phase change layer 82 is 10:1 to 100:1. The first thermal insulation member 8 occupies a small volume and can meet the size requirements under the extreme design of the battery. The first thermal insulation layer 81 can insulate between the two battery cells 6, and the first phase change layer 82 can absorb heat through phase change, having both thermal insulation and heat absorption capabilities, meeting the thermal diffusion safety protection requirements under the extreme design. The first phase change layer 82 is in the form of a thin film with a high surface area to volume ratio, which is conducive to improving the heat exchange efficiency.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery, characterized in that: include: Battery cells, a plurality of which are stacked along a first direction; a first thermal insulation member, located between two adjacent battery cells in the first direction, wherein the thickness of the first thermal insulation member is less than 1 mm; The first thermal insulation component includes a first thermal insulation layer and a first phase change layer. The first thermal insulation layer is bonded to the first phase change layer. The surface area to volume ratio of the first phase change layer is 10:1 to 100:

1.

2. The battery according to claim 1, characterized in that The first heat insulation layer is two layers, and the first phase change layer is one layer; Along the first direction, the first phase change layer is attached between two first heat insulation layers.

3. The battery according to claim 1, characterized in that The first heat insulation layer is one layer, and the first phase change layer is two layers; Along the first direction, the first heat insulation layer is attached between two layers of the first phase change layers.

4. The battery according to claim 1, characterized in that The ratio of the thickness of the first heat insulation layer to the thickness of the first phase change layer is 1:1 to 90:

1.

5. The battery according to claim 1, characterized in that The thickness of the first heat insulation layer ranges from 0.1 mm to 0.9 mm.

6. The battery according to claim 1, characterized in that The thickness of the first phase change layer ranges from 0.01 mm to 0.1 mm.

7. The battery according to claim 1, characterized in that The first heat-insulating layer comprises a heat-insulating substrate and a heat-insulating packaging film, wherein the heat-insulating substrate is used for heat insulation, and the heat-insulating packaging film is used for packaging the heat-insulating substrate; The first phase change layer includes a phase change substrate and a phase change packaging film. The phase change substrate is used for phase change and heat absorption, and the phase change packaging film is used for packaging the phase change substrate.

8. The battery according to claim 7, characterized in that Along the first direction, the heat-insulating packaging film and the phase-change packaging film that are bonded to each other are hot-melt-molded into one body.

9. The battery according to claim 1, characterized in that The first thermal insulation member further includes an adhesive layer, which is located between the first thermal insulation layer and the first phase change layer and is used to bond the first thermal insulation layer and the first phase change layer.

10. The battery according to claim 1, characterized in that The first thermal insulation layer is made of a material with a thermal conductivity coefficient below 0.04W / m·K. The first thermal insulation layer is one of a foam plastic layer, an aerogel layer, a vacuum insulation board layer, a cellulose layer, a glass wool layer, a rock wool layer, or a composite film layer thereof.

11. The battery according to claim 1, characterized in that The phase change temperature range of the first phase change layer is 25° C. to 80° C. The first phase change layer is a paraffin layer, a fatty acid layer, a salt hydrate layer, a polymer phase change material layer, or a composite film layer thereof.

12. The battery according to claim 1, characterized in that The plurality of battery cells are arranged side by side along the second direction; The first thermal insulation member is located between two adjacent rows of battery cells; The first direction is perpendicular to the second direction.

13. The battery according to claim 12, characterized in that Also included are battery modules, wherein a plurality of the battery modules are arranged side by side along the first direction and / or the second direction; The battery module includes a plurality of the battery cells.

14. The battery according to claim 13, characterized in that The first thermal insulation member is provided between adjacent battery modules.

15. The battery according to claim 13, characterized in that A second thermal insulation member is provided between adjacent battery modules; The second thermal insulation member includes a second thermal insulation layer and a second phase change layer, wherein the second thermal insulation layer and the second phase change layer are both multi-layer and alternately stacked; The surface area to volume ratio of the second phase change layer is 10:1 to 100:

1.

16. An electrical device, characterized in that: Comprising the battery according to any one of claims 1 to 15.

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