Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a box body, a battery monomer and a heat preservation assembly, the battery monomer is accommodated in the box body, the heat preservation assembly is arranged on at least one side, facing the battery monomer, of the box body, and the heat preservation assembly comprises a heat reflection part; and the heat reflecting piece is configured to be capable of reflecting back at least part of heat rays projected to the surface of the heat reflecting piece by the battery monomer. The battery device provided by the utility model is beneficial to improving the thermal insulation performance of the thermal insulation assembly, reducing the influence of the external environment on the temperature control of the battery monomers, conveniently controlling the battery monomers to be kept at a proper temperature, and beneficial to improving the reliability of the battery monomers, so that the reliability of the battery device is improved.

Description

Technical Field

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

[0002] Battery devices are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

[0003] In the development of battery device technology, in addition to improving the performance of the battery device, the reliability of the battery device is also an issue that needs to be considered. Therefore, how to improve the reliability of the battery device is an issue of continuous improvement in battery device technology. Utility Model Content

[0004] The present application provides a battery device and an electrical device to improve the reliability of the battery device.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the battery device provided in an embodiment of the present application includes a casing, a battery cell and a thermal insulation component, wherein the battery cell is accommodated in the casing, the thermal insulation component is arranged on at least one side of the casing facing the battery cell, and the thermal insulation component includes a heat reflecting member, which is configured to reflect back at least part of the heat rays projected onto its surface by the battery cell.

[0007] The battery device provided in the embodiment of the present application, by providing a heat preservation component including a heat reflecting member, and providing the heat preservation component on at least one side of the box body facing the battery cell, can reduce the heat transfer efficiency between the battery cell and the external environment of the battery device through the heat reflecting member. This is beneficial to improving the heat preservation performance of the heat preservation component, reducing the influence of the external environment on the temperature control of the battery cell, facilitating the control of the battery cell to maintain a suitable temperature, and is beneficial to improving the reliability of the battery cell, thereby improving the reliability of the battery device.

[0008] According to some embodiments of the present application, the heat reflecting member includes a metal film.

[0009] In the above scheme, the metal film has good heat reflection performance and can reflect back more infrared and other heat rays projected onto it, which is beneficial to further reduce the heat exchange efficiency between the battery device and the external environment. The metal film also has good structural strength, which is beneficial to improve the reliability of the heat reflection component.

[0010] According to some embodiments of the present application, the thermal insulation assembly further includes an energy storage component, which is disposed between at least a portion of the heat reflecting component and the battery cell, and is configured to absorb heat from the battery cell and release heat to the battery cell.

[0011] In the above scheme, by arranging the thermal insulation component including the energy storage component, and arranging the energy storage component between the heat reflecting component and the battery cell, when the temperature of the battery cell is high, the excess heat can be stored through the energy storage component, and when the temperature of the battery cell is low, the heat is released to the battery cell through the energy storage component, so that the battery cell can be maintained at a suitable temperature for a period of time in a low-temperature shutdown environment, thereby reducing the risk of low-temperature damage to the battery cell.

[0012] According to some embodiments of the present application, the energy storage element includes a first phase change element, which is configured to be convertible between a first state and a second state, wherein the first state and the second state are any two of a solid state, a liquid state, and a gas state.

[0013] In the above scheme, the first phase change element repeatedly absorbs and releases heat by repeatedly switching between the first state and the second state, so that the first phase change element absorbs the heat of the battery cell at a suitable temperature and releases the heat to the battery cell at a suitable temperature, which is conducive to improving the thermal insulation performance between insulation, which is beneficial to improving the accuracy of temperature control of the battery cell during operation, and is beneficial to reducing the risk of damage to the battery cell due to low temperature when in the shutdown state.

[0014] According to some embodiments of the present application, the heat reflecting element is in a bag shape and has a containing space, and the first phase change element is contained in the containing space.

[0015] In the above scheme, the first phase change element can be sealed in the heat reflective element, and the first phase change element can repeatedly undergo phase change in the heat reflective element, which is beneficial to simplify the overall structure of the insulation component and reduce the risk of loss of the first phase change element, so that the first phase change element can be repeatedly used.

[0016] According to some embodiments of the present application, the energy storage component further includes a temperature-averaging component, and the temperature-averaging component is thermally connected to the first phase change component.

[0017] In the above scheme, by arranging the energy storage component to include a temperature equalizing component and arranging the temperature equalizing component to be thermally connected to the first phase change component, it is beneficial to improve the temperature uniformity of the energy storage component, thereby improving the temperature uniformity of the battery cell, and further improving the reliability of the battery device.

[0018] According to some embodiments of the present application, the thermal insulation assembly further includes a thermal insulation member, and the thermal insulation member is disposed on a side of the heat reflecting member that is away from the battery cell.

[0019] In the above scheme, the heat insulation member is arranged between the heat reflecting member and the wall of the box body to prevent heat conduction between the battery cell and the external environment, which is further beneficial to reduce the heat exchange coefficient between the battery cell and the external environment and improve the thermal insulation performance of the thermal insulation component.

[0020] According to some embodiments of the present application, the thermal conductivity K of the thermal insulation element satisfies: K≤0.2W / m·K.

[0021] In the above scheme, by setting K≤0.2W / m·K, it is beneficial to improve the insulation effect of the insulation component and further reduce the coefficient of heat transfer between the battery cell and the external environment. When the battery device is shut down in a low temperature environment, the battery cell can be maintained at a suitable temperature for a period of time, further reducing the risk of low-temperature damage to the battery cell.

[0022] According to some embodiments of the present application, the thermal insulation member includes a polyurethane foam member, a polystyrene foam member, a polyisocyanurate foam member, or a vacuum insulation member.

[0023] In the above scheme, the polyurethane foam parts, polystyrene foam parts, polyisocyanurate foam parts and vacuum insulation parts all have good thermal insulation effects and are light in weight, which is beneficial to improving the energy density of the battery cell.

[0024] According to some embodiments of the present application, the battery device includes multiple battery cells, and the insulation components are arranged on both sides of the multiple battery cells along the first direction, the second direction and the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0025] In the above scheme, insulation components are provided on the walls on the two sides opposite to each other along the first direction, the walls on the two sides opposite to each other along the second direction, and the walls on the two sides opposite to each other along the third direction of the box body. The insulation components can be arranged around the circumference of multiple battery cells to insulate the circumference of the battery cells in multiple directions, which is beneficial to improving the insulation effect of the insulation components on the battery cells.

[0026] According to some embodiments of the present application, the battery device further includes a thermal insulation cover, which is provided on a plurality of battery cells, and the thermal insulation cover is at least partially located between the battery cells and the thermal insulation assembly, and the thermal insulation cover and the battery cells are in contact with each other.

[0027] In the above scheme, the thermal insulation cover is located between the thermal insulation assembly and the battery cell, and the thermal insulation cover and the battery cell are in close contact with each other, which can provide a certain thermal insulation effect for the battery cell and further reduce the heat exchange efficiency between the battery cell and the external environment.

[0028] According to some embodiments of the present application, the battery device also includes a second phase change element, which is disposed between two adjacent battery cells and is configured to be able to switch between a third state and a fourth state, wherein the third state and the fourth state are any two of solid, liquid and gaseous states.

[0029] In the above scheme, by arranging the second phase change element between the battery cells, it is beneficial to improve the efficiency of heat transfer between the second phase change element and the battery cells, and facilitate the second phase change element to efficiently absorb heat and efficiently release heat, so that the cells can maintain a suitable temperature, further reducing the risk of damage to the battery cells due to low temperature.

[0030] According to some embodiments of the present application, the battery device further includes a heating element, which is thermally connected to the second phase change element.

[0031] In the above solution, by providing a heating element thermally connected to the second phase change element, the second phase change element can be heated by the heating element, so that the second phase change element stores heat and releases the heat to the battery cell at an appropriate time.

[0032] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device provided in any of the above embodiments.

[0033] The electric device provided in the embodiment of the present application has the same technical effect as the battery device provided in the above embodiment, and thus will not be described in detail here.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0038] Figure 3 A schematic diagram of the structure of a battery module in a battery device provided in an embodiment of the present application;

[0039] Figure 4A schematic diagram of the explosion structure of a battery cell in a battery device provided in an embodiment of the present application;

[0040] Figure 5 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0041] Figure 6 for Figure 5 A partial enlarged view of the middle A;

[0042] Figure 7 Another schematic diagram of the structure of the battery device provided in the embodiment of the present application;

[0043] Figure 8 A schematic diagram of another structure of a battery device provided in an embodiment of the present application;

[0044] Fig. 9 This is a schematic diagram of the structure of the battery device provided in an embodiment of the present application with some structures omitted.

[0045] In the drawings, the figures are not necessarily drawn to scale.

[0046] Description of reference numerals:

[0047] 1-Vehicle; 1a-Motor; 1b-Controller;

[0048] 10-battery device; 11-box; 111-first sub-box; 112-second sub-box;

[0049] 20-battery module;

[0050] 30 - battery cell; 31 - shell; 311 - housing; 312 - end cap; 32 - electrode assembly; 321 - electrode body; 322 - pole ear; 33 - electrode terminal;

[0051] 40-heat-insulating component; 41-heat-reflecting component; 42-energy-storing component; 43-heat-insulating component;

[0052] 50-Insulation cover;

[0053] 60- second phase change element;

[0054] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0057] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0058] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0060] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0061] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0062] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0063] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0064] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0065] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0066] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0067] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0068] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0069] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0070] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0071] The battery device needs to work within a suitable temperature range to have good cycle performance. Usually, the battery device performs thermal management on the battery cells through its own thermal management components to control the temperature of the battery cells. The battery cells inevitably exchange heat with the external environment through heat conduction, heat convection or heat radiation. Therefore, in order to improve the accuracy of battery cell temperature control, a thermal insulation component is usually provided to reduce the heat exchange efficiency between the battery cells and the external environment, so that the battery management system can more accurately control the temperature of the battery cells and facilitate the battery cells to maintain a suitable temperature range regardless of high or low temperature environments.

[0072] However, in the related art, the thermal insulation performance of the thermal insulation component for the battery cell is poor. In a high temperature environment, the heat in the environment will be easily transferred to the battery cell. In a low temperature environment, after the battery device stops running, the temperature of the battery cell drops rapidly, causing irreversible damage to the battery cell, thus seriously affecting the reliability of the battery device.

[0073] In view of this, the battery device provided in the embodiment of the present application includes a box body, a battery cell and a thermal insulation component, the battery cell is accommodated in the box body, the thermal insulation component is arranged on at least one side of the box body facing the battery cell, and the thermal insulation component includes a heat reflecting member, which is configured to reflect back at least part of the heat rays projected onto its surface by the battery cell.

[0074] The battery device provided in the embodiment of the present application, by providing a heat preservation component including a heat reflecting member, and providing the heat preservation component on at least one side of the box body facing the battery cell, can reduce the heat transfer efficiency between the battery cell and the external environment of the battery device through the heat reflecting member. This is beneficial to improving the heat preservation performance of the heat preservation component, reducing the influence of the external environment on the temperature control of the battery cell, facilitating the control of the battery cell to maintain a suitable temperature, and is beneficial to improving the reliability of the battery cell, thereby improving the reliability of the battery device.

[0075] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0076] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. The battery device disclosed in the present application can be used to form a power supply system of the electrical device.

[0077] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0078] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device in an embodiment of the present application.

[0079] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided in an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1, and the battery device 10 may be provided at the bottom, head or tail of the vehicle 1. The battery device 10 may be used to power the vehicle 1, for example, the battery device 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1.

[0080] The vehicle 1 may further include a controller 1b and a motor 1a, wherein the controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, to meet the power requirements of starting, navigating, and driving the vehicle 1.

[0081] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1 , but also serve 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 .

[0082] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in an embodiment of the present application. Figure 3Schematic diagram of the structure of the battery cell 30 in the battery device 10 provided in the embodiment of the present application. The battery device 10 includes a box 11 and a battery cell 30, and the battery cell 30 is accommodated in the box 11. Among them, the box 11 is used to provide a storage space for the battery cell 30, and the box 11 can adopt a variety of structures. In some embodiments, the box 11 may include a first sub-box 111 and a second sub-box 112, the first sub-box 111 and the second sub-box 112 cover each other, and the first sub-box 111 and the second sub-box 112 jointly define a storage space for accommodating the battery cell 30. The second sub-box 112 may be a hollow structure with one end open, and the first sub-box 111 may be a plate-like structure, and the first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 may also be hollow structures both with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0083] In the battery device 10, there may be multiple battery cells 30, and the multiple battery cells 30 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 30 are both connected in series and in parallel. The multiple battery cells 30 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 30 is accommodated in the box 11; of course, the battery device 10 may also be a battery module 20 in the form of multiple battery cells 30 connected in series, in parallel, or in a mixed connection, and then the multiple battery modules 20 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery device 10 may also include other structures, for example, the battery device 10 may also include a busbar component for realizing electrical connection between the multiple battery cells 30.

[0084] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0085] Please refer to Figure 4 , Figure 4 Schematic diagram of the exploded structure of the battery cell 30 in the battery device 10 provided in the embodiment of the present application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32 and an electrode terminal 33. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0086] The shell 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte and other components. The shell 311 and the end cap 312 can be independent components. The shell 311 can be of various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0087] The end cap 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the shell 311 to match the shell 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 312 is not easily deformed when squeezed and collided, so that the battery cell 30 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminal 33 can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy of the battery cell 30. The material of the end cap 312 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 312, and the insulating structure may be used to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0088] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 32 may be included in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body 321 of the electrode assembly 32, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tabs 322. The positive tab and the negative tab may be located together at one end of the electrode body 321 or at both ends of the electrode body 321, respectively. During the charge and discharge process of the battery cell 30, the positive active material and the negative active material react with the electrolyte, and the tabs 322 are connected to the electrode terminals 33 to form a current loop.

[0089] First, as Figure 5 and Figure 6As shown, the battery device 10 provided in the embodiment of the present application includes a box body 11, a battery cell 30 and a heat preservation component 40, the battery cell 30 is accommodated in the box body 11, the heat preservation component 40 is arranged on at least one side of the box body 11 facing the battery cell 30, and the heat preservation component 40 includes a heat reflection member 41, and the heat reflection member 41 is configured to be able to reflect back at least part of the heat rays projected onto its surface by the battery cell 30.

[0090] The box body 11 can be in the shape of a rectangular parallelepiped, and the thermal insulation component 40 is arranged on at least one side of the box body 11 facing the battery cell 30. The thermal insulation component 40 can be arranged on any side, any two sides, any three sides, any four sides, or any five sides of the box body 11 facing the battery cell 30, or the thermal insulation component 40 can be arranged on all six sides of the box body 11 facing the battery cell 30.

[0091] The box body 11 may include a box body and a cover body, the cover body is covered on the box body 11, the insulation component 40 may be arranged on the cover body, or the insulation component 40 may be arranged around the intersection of the box body and the cover body, or the insulation component 40 may be arranged on the cover body and around the intersection of the box body and the cover body.

[0092] Optionally, the insulation component 40 can be arranged between the wall of the box body 11 and the battery cell 30, or the insulation component 40 and the box body 11 can be integrated into one body to utilize the space of the wall of the box body 11 to set the insulation component 40, thereby reducing the space occupied by the insulation component 40, which is beneficial to improving the energy density of the battery device 10.

[0093] The thermal insulation component 40 has a thermal insulation function. Specifically, the thermal insulation component 40 can prevent the external environment of the battery cell 30 from undergoing heat exchange. In this way, when the battery device 10 is working in a high-temperature environment, due to the thermal insulation effect of the thermal insulation component 40, the external environment is not easy to exchange heat with the battery cell 30. The battery device 10 controls the temperature of the battery cell 30 through its own thermal management components, and can more accurately control the temperature of the battery cell 30 to maintain the normal circulation of the battery cell 30.

[0094] When the battery device 10 is working in a low-temperature environment, due to the heat preservation effect of the heat preservation component 40, the heat of the battery cell 30 is not easy to dissipate to the outside of the battery device 10. The battery device 10 can more accurately control the temperature of the battery cell 30 through the internal thermal management component to maintain it at a suitable working temperature. After the battery device 10 stops working in a low-temperature environment, due to the heat preservation effect of the heat preservation component 40, the heat of the battery cell 30 is slowly dissipated to the external environment, and the heat can be maintained for a long time, which is conducive to reducing the risk of irreversible damage to the battery cell 30 at low temperatures.

[0095] The heat-insulating assembly 40 includes a heat-reflecting member 41, which is configured to reflect back at least part of the heat rays projected onto its surface by the battery cell. The heat rays may be infrared rays, etc. Thus, at least part of the heat rays emitted by the battery cell 30 can be reflected by the heat-reflecting member 41 and then returned to the battery cell 30. Alternatively, at least part of the heat rays in the external environment can be reflected by the heat-reflecting member 41 and then returned to the external environment. In other words, the heat-reflecting member 41 can prevent at least part of the heat radiation between the battery cell 30 and the external environment, which is beneficial to improving the heat-insulating performance of the heat-insulating assembly 40 and reducing the heat exchange efficiency between the battery cell 30 and the external environment.

[0096] Optionally, the heat reflecting member 41 may include a metal film, such as a double-sided aluminum foil, or the heat reflecting member 41 may be a metal coating or an organic coating.

[0097] Optionally, the heat preservation component 40 may only include the heat reflection member 41. Of course, the heat preservation component 40 may also include other structures, such as heat insulation materials, etc., to further reduce the heat transfer efficiency between the battery cell 30 and the external environment.

[0098] The battery device 10 provided in the embodiment of the present application is provided with a heat preservation component 40 including a heat reflection component 41, and the heat preservation component 40 is provided on at least one side of the box body 11 facing the battery cell 30. The heat reflection component 41 can reduce the heat transfer efficiency between the battery cell 30 and the external environment of the battery device 10. This is beneficial to improving the heat preservation performance of the heat preservation component 40, reducing the influence of the external environment on the temperature control of the battery cell 30, facilitating the control of the battery cell 30 to maintain it at a suitable temperature, and is beneficial to improving the reliability of the battery cell 30, thereby improving the reliability of the battery device 10.

[0099] In some embodiments, the heat reflecting member 41 includes a metal film.

[0100] The metal film can be double-sided aluminum foil or double-sided copper foil, etc.

[0101] The metal film has good heat reflection performance and can reflect back more infrared and other heat rays projected onto it, which is beneficial to further reduce the heat exchange efficiency between the battery device 10 and the external environment. The metal film also has good structural strength, which is beneficial to improve the reliability of the heat reflection member 41.

[0102] In some embodiments, Figure 5 and Figure 6As shown, the heat preservation assembly 40 further includes an energy storage component 42 , which is disposed between at least a portion of the heat reflection component 41 and the battery cell 30 , and is configured to absorb heat from the battery cell 30 and release heat to the battery cell 30 .

[0103] Alternatively, the energy storage member 42 may include a material with high specific heat capacity, such as water, etc., to store or release heat by increasing or decreasing the temperature. Alternatively, the energy storage member 42 may include a phase change material, such as paraffin, etc., to store or release heat by changing the state.

[0104] The energy storage component 42 can store or release heat. In this way, when the temperature of the battery cell 30 is high, the energy storage component 42 can absorb and store the heat of the battery cell 30. As the temperature of the battery cell 30 decreases, the energy storage component 42 can release heat to the battery cell 30. In particular, in a low temperature environment, after the battery device 10 stops working, the heat stored in the energy storage component 42 can be used to heat the battery cell 30, so as to reduce the risk of irreversible damage to the battery cell 30 due to excessively low temperature.

[0105] The energy storage component 42 is disposed between at least a portion of the heat reflector 41 and the battery cell 30. The energy storage component 42 may be disposed between the entire heat reflector 41 and the battery cell 30, or the energy storage component 42 may be disposed between a portion of the heat reflector 41 and the battery cell 30. In other words, the energy storage component 42 may not be disposed between a portion of the heat reflector 41 and the battery cell. In this way, after the heat released by the energy storage component 42 is radiated to the surface of the heat reflector 41, at least a portion of the heat will be reflected back by the heat reflector 41, so as to reduce the energy loss inside the battery device 10.

[0106] By providing the heat preservation assembly 40 including the energy storage component 42, and arranging the energy storage component 42 between the heat reflecting component 41 and the battery cell 30, when the temperature of the battery cell 30 is high, the excess heat can be stored through the energy storage component 42, and when the temperature of the battery cell 30 is low, the heat is released to the battery cell 30 through the energy storage component 42, so that the battery cell 30 can be maintained at a suitable temperature for a period of time in a low-temperature shutdown environment, thereby reducing the risk of low-temperature damage to the battery cell 30.

[0107] In some embodiments, the energy storage element 42 includes a first phase-change element, which is configured to be switchable between a first state and a second state, wherein the first state and the second state are any two of a solid state, a liquid state, and a gas state.

[0108] Alternatively, the first state may be one of a solid state and a liquid state, the second state may be the other of the solid state and the liquid state, the first phase change element absorbs and stores heat in the process of converting from a solid state to a liquid state, and the first phase change element releases heat in the process of converting from a liquid state to a solid state. Alternatively, the first state may be one of a liquid state and a gaseous state, the second state may be the other of the liquid state and the gaseous state, the first phase change element absorbs and stores heat in the process of converting from a liquid state to a gaseous state, and releases heat in the process of converting from a gaseous state to a liquid state.

[0109] The first phase change element may be set to have a suitable phase change point according to actual needs. Exemplarily, the phase change point of the first phase change element is between 30°C and 35°C.

[0110] In this way, the first phase change element repeatedly absorbs and releases heat by repeatedly switching between the first state and the second state, so that the first phase change element absorbs the heat of the battery cell 30 at a suitable temperature, and releases the heat to the battery cell 30 at a suitable temperature, which is conducive to improving the thermal insulation performance between insulation, which is beneficial to improving the accuracy of temperature control of the battery cell 30 during operation, and is beneficial to reducing the risk of damage to the battery cell 30 due to excessively low temperature when in the shutdown state.

[0111] In some embodiments, the heat reflecting element 41 is in a bag shape and has a containing space, and the first phase change element is contained in the containing space.

[0112] In this way, the first phase change element can be sealed in the heat reflecting element 41, and the first phase change element can repeatedly change phase in the heat reflecting element 41, which is beneficial to simplify the overall structure of the insulation component 40 and reduce the risk of loss of the first phase change element, so that the first phase change element can be repeatedly used.

[0113] In some embodiments, the energy storage element 42 further includes a temperature-averaging element, which is thermally connected to the first phase-change element.

[0114] The temperature-uniform component may have a relatively high thermal conductivity so that heat can be quickly transferred within the first phase-change component, thereby improving the temperature uniformity of the first phase-change component.

[0115] Exemplarily, the first phase change member may include paraffin, the temperature uniformity member may include carbon nano powder, and the carbon nano powder may be uniformly mixed in the first phase change member.

[0116] The energy storage element 42 includes a temperature-uniform element, and the temperature-uniform element is thermally connected to the first phase change element, which is beneficial to improving the temperature uniformity of the energy storage element 42 , thereby improving the temperature uniformity of the battery cell 30 , and further improving the reliability of the battery device 10 .

[0117] In some embodiments, Figure 5 and Figure 6As shown, the heat preservation assembly 40 further includes a heat insulating member 43 , and the heat insulating member 43 is disposed on a side of the heat reflecting member 41 facing away from the battery cell 30 .

[0118] The heat insulating member 43 may be made of a heat insulating material so that the heat insulating member 43 can reduce heat conduction between the battery cell 30 and the external environment.

[0119] The heat insulating member 43 is arranged on the side of the heat reflecting member 41 facing away from the battery cell 30, and the heat insulating member 43 is arranged between the heat reflecting member 41 and the wall of the box body 11 to prevent heat conduction between the battery cell 30 and the external environment, which is further beneficial to reduce the heat exchange coefficient between the battery cell 30 and the external environment and improve the thermal insulation performance of the thermal insulation component 40.

[0120] In some embodiments, the thermal conductivity K of the thermal insulation member 43 satisfies: K≤0.2 W / m·K.

[0121] Optionally, the thermal conductivity K of the thermal insulation member 43 can be 0.2W / m·K, 0.15W / m·K, 0.1W / m·K or 0.05W / m·K, etc. The smaller K is, the greater the effect of the thermal insulation member 43 in blocking the battery cell 30 from the external environment, which is beneficial to improving the thermal insulation effect of the thermal insulation component 40. Combined with the multiple functions of the heat reflection member 41 and the energy storage member 42, the battery device 10 can maintain a suitable ambient temperature for the battery cell 30 for 4 to 6 hours when it is shut down in a low-temperature environment. In this way, the risk of low-temperature damage to the battery cell 30 is reduced during the shutdown period of the battery device 10.

[0122] Therefore, by setting K≤0.2W / m·K, it is beneficial to improve the insulation effect of the insulation component 40, further reduce the coefficient of heat transfer between the battery cell 30 and the external environment, and when the battery device 10 is shut down in a low temperature environment, the battery cell 30 can be maintained at a suitable temperature for a period of time, further reducing the risk of low-temperature damage to the battery cell 30.

[0123] In some embodiments, the thermal insulation member 43 includes a polyurethane foam member, a polystyrene foam member, a polyisocyanurate foam member, or a vacuum insulation member.

[0124] The polyurethane foam piece, the polystyrene foam piece, the polyisocyanurate foam piece and the vacuum insulation piece all have good heat preservation effect and are light in weight, which is beneficial to improving the energy density of the battery cell 30 .

[0125] In some embodiments, Figure 5 As shown, the battery device 10 includes a plurality of battery cells 30, and the heat preservation assembly 40 is disposed on both sides of the plurality of battery cells 30 along the first direction X, the second direction Y and the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0126] In this way, the wall portions on the two sides opposite to each other along the first direction X, the wall portions on the two sides opposite to each other along the second direction Y, and the wall portions on the two sides opposite to each other along the third direction Z of the box body 11 are provided with insulation components 40. The insulation components 40 can be arranged around the circumference of multiple battery cells 30 to insulate the circumference of the battery cells 30 in multiple directions, which is beneficial to improving the insulation effect of the insulation components 40 on the battery cells 30.

[0127] In some embodiments, Figure 7 As shown, the battery device 10 further includes a heat preservation cover 50 , which covers the plurality of battery cells 30 , and at least a portion of the heat preservation cover 50 is located between the battery cells 30 and the heat preservation assembly 40 , and the heat preservation cover 50 and the battery cells 30 are in contact with each other.

[0128] Optionally, the thermal insulation cover 50 may include a flame retardant polyimide film, a flame retardant gas-gel composite material, a flame retardant silicone rubber film or a flame retardant fiber material. The flame retardant polyimide film has excellent flexibility and high temperature resistance, and is suitable for use in environments requiring electrical insulation and flame retardancy. The flame retardant gas-gel composite material can provide efficient thermal insulation performance and can be made into a flexible film form. The flame retardant silicone rubber film is soft and has a certain degree of elasticity, and has good waterproof and sealing properties. Flame retardant fiber materials, such as aramid fibers, can be made into lightweight, soft fiber felts or films to provide reliable thermal insulation and flame retardant protection.

[0129] The heat preservation cover 50 is at least partially located between the heat preservation assembly 40 and the battery cell 30, and the heat preservation cover 50 and the battery cell 30 are in contact with each other, so the heat preservation cover 50 can provide a certain heat preservation effect for the battery cell 30, further reducing the heat exchange efficiency between the battery cell 30 and the external environment.

[0130] In some embodiments, Figure 8 and Fig. 9 As shown, the battery device 10 further includes a second phase change element 60 , which is disposed between two adjacent battery cells 30 and is configured to be switchable between a third state and a fourth state, wherein the third state and the fourth state are any two of a solid state, a liquid state and a gaseous state.

[0131] Alternatively, the third state may be one of a solid state and a liquid state, and the fourth state may be the other of the solid state and the liquid state; or the third state may be one of a liquid state and a gaseous state, and the fourth state may be the other of the liquid state and the gaseous state.

[0132] Optionally, the second phase change element 60 may be disposed between some of the battery cells 30 , or the second phase change element 60 may be disposed between all of the battery cells 30 .

[0133] By arranging the second phase change element 60 between the battery cells 30, it is helpful to improve the efficiency of heat transfer between the second phase change element 60 and the battery cells 30, and facilitate the second phase change element 60 to efficiently absorb heat and efficiently release heat, so that the cells can maintain a suitable temperature, further reducing the risk of damage to the battery cells 30 due to low temperature.

[0134] In some embodiments, the battery device 10 further includes a heating element, which is thermally connected to the second phase change element 60 .

[0135] The heating element is thermally connected to the second phase change element 60, and the heating element can be directly attached to the second phase change element 60, or the heating element can be indirectly thermally connected to the second phase change element 60 through an intermediate heat conductive element. Optionally, the phase change element can be a heating film or other structure.

[0136] By providing a heating element in thermal connection with the second phase change element 60 , the second phase change element 60 can be heated by the heating element, so that the second phase change element 60 stores heat and releases the heat to the battery cell 30 at an appropriate time.

[0137] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device 10 provided in any of the above embodiments, and the battery device 10 is used to provide electrical energy.

[0138] The electric device provided in the embodiment of the present application has the same technical effect as the battery device 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0139] In some embodiments, Figures 5 to 9As shown, the battery device 10 provided in the embodiment of the present application includes a box body 11, a plurality of battery cells 30, a heat preservation component 40, a heat preservation cover 50, a heating element and a second phase change element 60, and the battery cells 30 are accommodated in the box body 11. The heat preservation component 40 is arranged on at least one side of the box body 11 facing the battery cells 30, and the heat preservation component 40 includes a heat reflection component 41, an energy storage component 42 and a heat insulation component 43. The heat reflection component 41 is configured to be able to reflect back at least part of the heat rays projected onto its surface, and the heat reflection component 41 includes a metal film. The energy storage component 42 is arranged between at least part of the heat reflection component 41 and the battery cells 30, and the energy storage component 42 is configured to be able to absorb the heat of the battery cells 30 and release the heat to the battery cells 30. The energy storage component 42 includes a first phase change component and a temperature equalization component, and the first phase change component is configured to be able to switch between a first state and a second state, and the temperature equalization component is thermally connected to the first phase change component. The heat insulating member 43 is arranged on the side of the heat reflecting member 41 facing away from the battery cell 30, and includes a polyurethane foam member, a polystyrene foam member, a polyisocyanurate foam member or a vacuum insulation member. The thermal conductivity K of the heat insulating member 43 satisfies: K≤0.2W / m·K. The heat preservation assembly 40 is arranged on both sides of the plurality of battery cells 30 along the first direction X, along both sides of the second direction Y, and along both sides of the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The heat preservation cover 50 is arranged on the plurality of battery cells 30, and the heat preservation cover 50 is at least partially located between the battery cell 30 and the heat preservation assembly 40, and the heat preservation cover 50 and the battery cell 30 are in contact with each other. The second phase change member 60 is arranged between two adjacent battery cells 30, and is configured to be able to switch between the third state and the fourth state, and the heating element is thermally connected to the second phase change member 60.

[0140] The battery device 10 provided in the embodiment of the present application is provided with a heat preservation component 40 including a heat reflection component 41, and the heat preservation component 40 is provided on at least one side of the box body 11 facing the battery cell 30. The heat reflection component 41 can reduce the heat transfer efficiency between the battery cell 30 and the external environment of the battery device 10. This is beneficial to improving the heat preservation performance of the heat preservation component 40, reducing the influence of the external environment on the temperature control of the battery cell 30, facilitating the control of the battery cell 30 to maintain it at a suitable temperature, and is beneficial to improving the reliability of the battery cell 30, thereby improving the reliability of the battery device 10.

[0141] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Box; A battery cell is contained in the box; The heat preservation component is arranged on at least one side of the box body facing the battery cell, and the heat preservation component includes a heat reflection member, and the heat reflection member is configured to reflect back at least part of the heat rays projected onto the surface of the battery cell.

2. The battery device according to claim 1, characterized in that: The heat reflecting member includes a metal film.

3. The battery device according to claim 1, characterized in that: The heat preservation assembly further includes an energy storage component, which is disposed between at least a portion of the heat reflecting component and the battery cell, and is configured to absorb heat from the battery cell and release heat to the battery cell.

4. The battery device according to claim 3, characterized in that: The energy storage element includes a first phase change element, wherein the first phase change element is configured to be switchable between a first state and a second state, wherein the first state and the second state are any two of a solid state, a liquid state, and a gas state.

5. The battery device according to claim 4, characterized in that: The heat reflecting member is in a bag shape and has a containing space, and the first phase change member is contained in the containing space.

6. The battery device according to claim 4, characterized in that: The energy storage component further includes a temperature-averaging component, and the temperature-averaging component is thermally connected to the first phase-change component.

7. The battery device according to claim 1, characterized in that: The heat preservation component further comprises a heat insulating member, and the heat insulating member is arranged on a side of the heat reflecting member facing away from the battery cell.

8. The battery device according to claim 7, characterized in that: The thermal conductivity K of the thermal insulation component satisfies: K≤0.2W / m·K.

9. The battery device according to claim 7, characterized in that: The heat insulating member includes a polyurethane foam member, a polystyrene foam member, a polyisocyanurate foam member or a vacuum insulation member.

10. The battery device according to any one of claims 1 to 9, characterized in that: The battery device includes a plurality of battery cells, and the heat preservation components are arranged on both sides of the plurality of battery cells along a first direction, a second direction, and a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other.

11. The battery device according to any one of claims 1 to 9, characterized in that: The battery device further comprises a heat preservation cover, which is arranged on the plurality of battery cells and at least partly located between the battery cells and the heat preservation assembly, and the heat preservation cover and the battery cells are attached to each other.

12. The battery device according to any one of claims 1 to 9, characterized in that: The battery device further includes a second phase change element, which is disposed between two adjacent battery cells and is configured to be switchable between a third state and a fourth state, wherein the third state and the fourth state are any two of a solid state, a liquid state and a gaseous state.

13. The battery device according to claim 12, characterized in that: The battery device further includes a heating element, which is thermally connected to the second phase change element.

14. An electrical device, characterized in that: The battery device comprises a battery device as claimed in any one of claims 1 to 13, wherein the battery device is used to provide electrical energy.

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