Electric device, battery device and thermal management assembly thereof

Abstract

The utility model provides a power utilization device, a battery device and a heat management assembly of the battery device. The battery device comprises a battery monomer, a soaking part and a heat exchange part, the soaking part is in heat conduction connection with the lower part of the battery monomer along the gravity direction, the soaking part comprises a first outer shell and a first working medium, the first outer shell is provided with a first hollow cavity, and the first working medium is accommodated in the first hollow cavity and is configured to be capable of switching between a liquid state and a vapor state. And the heat exchange piece is arranged on one side of the soaking piece back to the battery monomers and is in heat conduction connection with the soaking piece. The first outer shell is provided with a first wall, the first wall is arranged on the side, facing the heat exchange piece, of the first hollow cavity, the soaking piece further comprises a hydrophobic layer, the hydrophobic layer is arranged on the side, facing the first hollow cavity, of the first wall, and the hydrophobic layer is configured to enable the first working medium in the liquid state to be condensed into liquid drops. According to the battery device provided by the embodiment of the invention, the heat exchange efficiency of the heat exchange piece and the battery monomers is improved, 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 an electrical device, a battery device and a thermal management component thereof. 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 an electrical device, a battery device and a thermal management component thereof 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 by the embodiment of the present application includes a battery cell, a heat spreader and a heat exchanger. The heat spreader is thermally connected to the lower side of the battery cell along the direction of gravity, and the heat spreader includes a first outer shell and a first working medium, and the first outer shell has a first hollow cavity, and the first working medium is accommodated in the first hollow cavity and is configured to be able to switch between liquid and vapor states. The heat exchanger is arranged on the side of the heat spreader facing away from the battery cell, and is thermally connected to the heat spreader. The first outer shell has a first wall, and the first wall is arranged on the side of the first hollow cavity facing the heat exchanger, and the heat spreader also includes a hydrophobic layer, and the hydrophobic layer is arranged on the side of the first wall facing the first hollow cavity, and the hydrophobic layer is configured to enable the liquid first working medium to condense into droplets.

[0007] The battery device provided in the embodiment of the present application, by arranging a hydrophobic layer on the side of the first wall facing the first hollow cavity, so that the liquid first working fluid in the first hollow cavity drips onto the hydrophobic layer on the first wall under the action of gravity and condenses into droplets on the hydrophobic layer, which is beneficial to reducing the thermal resistance of heat transfer between the heat exchange component and the battery cell, and improving the heat transfer efficiency between the heat exchange component and the battery cell, and further helps to increase the rate of cooling or heating of the battery cell, and timely cool or heat the battery cell, so that the battery cell works at a suitable temperature, which is beneficial to improve the reliability performance of the battery device.

[0008] According to some embodiments of the present application, the first outer shell also has a second wall, which is arranged on the side of the first hollow cavity facing away from the first wall. The heat equalizing element also includes a capillary structure, which is arranged on the side of the second wall facing the first hollow cavity and is spaced apart from the hydrophobic layer.

[0009] In the above scheme, by setting a capillary structure to perform capillary adsorption and storage on the droplets condensed on the hydrophobic layer, it is beneficial to further reduce the risk of the liquid first working medium forming a thin liquid layer on the side of the first hollow cavity close to the heat transfer element, further help to reduce the thermal resistance between the heat transfer element and the battery cell, help to improve the heat exchange efficiency between the heat transfer element and the battery cell, and further help to improve the reliability of the battery device.

[0010] According to some embodiments of the present application, the capillary structure includes at least one of a metal mesh, a groove structure, and a sintered ceramic.

[0011] In the above solution, the capillary structure includes at least one of a metal mesh, a groove structure and a sintered ceramic, which is beneficial to improving the structural stability of the capillary structure, so as to improve the reliability of the capillary structure in absorbing and storing the liquid first working medium.

[0012] According to some embodiments of the present application, the heat exchange element further includes a hydrophilic layer, and the hydrophilic layer is disposed between the capillary structure and the second wall.

[0013] In the above scheme, the hydrophilic layer has good hydrophilicity and is arranged between the capillary structure and the second wall. After the capillary structure adsorbs the liquid first working fluid, the hydrophilic layer generates an attraction for the liquid first working fluid in the capillary structure, so that the liquid first working fluid can be more stably retained in the capillary structure, further reducing the risk of accumulation of the liquid first working fluid at the bottom of the first hollow cavity.

[0014] According to some embodiments of the present application, the hydrophilic layer includes at least one of a polyvinyl alcohol layer, a polyacrylic acid layer, and a hydrophilic oxide layer.

[0015] In the above scheme, the polyvinyl alcohol layer, the polyacrylic acid layer and the hydrophilic oxide layer have good attraction for the liquid first working medium in the capillary structure, so that the liquid first working medium can be more stably retained in the capillary structure.

[0016] According to some embodiments of the present application, the hydrophobic layer includes at least one of a fluorosilane coating layer and a super-hydrophobic nanolayer.

[0017] In the above solution, while reducing the production cost of the battery device, it is also helpful to further reduce the risk of the liquid first working fluid spreading on the bottom of the first hollow cavity.

[0018] According to some embodiments of the present application, the first working fluid includes deionized water.

[0019] In the above solution, the first working medium is set to include deionized water, so that the deionized water can be evaporated and condensed in time, and the battery cells can be cooled or heated in time, so as to more accurately balance the temperature of the battery cells in different areas.

[0020] According to some embodiments of the present application, the heat exchange element includes a second outer shell and a phase change element, the second outer shell has a second hollow cavity, the phase change element is disposed in the second hollow cavity, and the phase change element is configured to be able to switch between solid and liquid states.

[0021] In the above solution, the heat exchange element includes a second outer shell and a phase change element, which is beneficial to simplify the structure of the battery device and facilitate timely cooling of the battery cells, so as to further improve the reliability of the battery device.

[0022] According to some embodiments of the present application, the phase change element includes at least one of paraffin or expanded graphite.

[0023] In the above solution, the phase change element is provided to include at least one of paraffin wax or expanded graphite, which is beneficial to reducing the production cost of the battery device and facilitates the phase change element to cool down the battery cells in time, further helping to improve the reliability of the battery device.

[0024] According to some embodiments of the present application, an orthographic projection of the hydrophobic layer along the gravity direction covers at least a portion of the phase change element.

[0025] In the above scheme, a hydrophobic layer is arranged to cover at least part of the phase change element along the gravity direction. In the process of the heat exchange element absorbing the heat of the battery cell through the phase change element, it is beneficial to reduce the thermal resistance on the heat exchange path between the battery cell and the phase change element, and further helps to improve the heat exchange efficiency between the phase change element and the battery cell.

[0026] According to some embodiments of the present application, the battery device includes a plurality of battery cells, and an orthographic projection of a first hollow cavity along the gravity direction covers the plurality of battery cells.

[0027] In the above scheme, a first hollow cavity is provided whose orthographic projection along the gravity direction covers multiple battery cells, and the first working medium in the corresponding first hollow cavity can balance the temperature of the corresponding multiple battery cells, which is beneficial to further improve the temperature uniformity of the multiple battery cells.

[0028] According to some embodiments of the present application, the first wall has a first surface, the first surface is located on a side of the first wall facing the first hollow cavity, and the hydrophobic layer covers the entire first surface.

[0029] In the above scheme, due to the hydrophobicity of the hydrophobic layer, the liquid first working fluid condenses into droplets on the hydrophobic layer instead of spreading into a thin layer, which is beneficial to further reduce the thermal resistance on the heat transfer path between the heat exchanger and the battery cell, so as to improve the efficiency of heat exchange between the battery cell and the heat exchanger.

[0030] In the second aspect, the thermal management component provided in the embodiment of the present application is used for a battery device, and the thermal management component includes a heat spreader and a heat exchanger. The heat spreader is thermally connected to the bottom of the battery cell along the gravity direction. The heat spreader includes a first outer shell and a first working medium. The first outer shell has a first hollow cavity. The first working medium is accommodated in the first hollow cavity and is configured to be able to switch between liquid and vapor states. The heat exchanger is arranged on the side of the heat spreader facing away from the battery cell and is thermally connected to the heat exchanger. The first outer shell has a first wall, and the first wall is arranged on the side of the first hollow cavity facing the heat exchanger. The heat spreader also includes a hydrophobic layer, which is arranged on the side of the first wall facing the first hollow cavity. The hydrophobic layer is configured to enable the liquid first working medium to condense into droplets.

[0031] The thermal management component provided in the embodiment of the present application has a hydrophobic layer arranged on the side of the first wall facing the first hollow cavity. When the thermal management component is applied to a battery device, the liquid first working fluid in the first hollow cavity drips onto the hydrophobic layer on the first wall under the action of gravity and condenses into droplets on the hydrophobic layer, which is beneficial to reducing the thermal resistance of heat transfer between the heat exchange component and the battery cell, improving the heat transfer efficiency between the heat exchange component and the battery cell, and further beneficial to increasing the rate of cooling or heating the battery cell, and timely cooling or heating the battery cell, so that the battery cell works at a suitable temperature, which is beneficial to improving the reliability performance of the battery device.

[0032] According to some embodiments of the present application, the first outer shell also has a second wall, which is arranged on the side of the first hollow cavity facing away from the first wall. The heat equalizing element also includes a capillary structure, which is arranged on the side of the second wall facing the first hollow cavity and is spaced apart from the hydrophobic layer.

[0033] In the above scheme, by setting a capillary structure to perform capillary adsorption and storage on the droplets condensed on the hydrophobic layer, it is beneficial to further reduce the risk of the liquid first working medium forming a thin liquid layer on the side of the first hollow cavity close to the heat transfer element, further help to reduce the thermal resistance between the heat transfer element and the battery cell, help to improve the heat exchange efficiency between the heat transfer element and the battery cell, and further help to improve the reliability of the battery device.

[0034] According to some embodiments of the present application, the heat exchange element further includes a hydrophilic layer, and the hydrophilic layer is disposed between the capillary structure and the second wall.

[0035] In the above scheme, after the capillary structure adsorbs the liquid first working medium, the hydrophilic layer generates an attraction for the liquid first working medium in the capillary structure, so that the liquid first working medium can be more stably retained in the capillary structure, further reducing the risk of the liquid first working medium accumulating at the bottom of the first hollow cavity.

[0036] In a third aspect, the electrical device provided in the embodiments of the present application includes the battery device provided in any of the above embodiments.

[0037] 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.

[0038] 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

[0039] 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.

[0040] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0042] Figure 3 A schematic diagram of the structure of a battery module in a battery device provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of the explosion structure of a battery cell in a battery device provided in an embodiment of the present application;

[0044] Figure 5 A schematic diagram of the exploded structure of a battery device provided in an embodiment of the present application;

[0045] Figure 6 A partial cross-sectional view of a heat spreader in a battery device provided in an embodiment of the present application;

[0046] Figure 7 A partial cross-sectional view of another heat spreader in a battery device provided in an embodiment of the present application;

[0047] Figure 8 A partial cross-sectional view of another heat spreader in a battery device provided in an embodiment of the present application;

[0048] Fig. 9 A partial cross-sectional view of a heat exchange component in a battery device provided in an embodiment of the present application.

[0049] In the drawings, the figures are not necessarily drawn to scale.

[0050] Description of reference numerals:

[0051] 1-Vehicle; 1a-Motor; 1b-Controller;

[0052] 10-battery device; 11-box; 111-first sub-box; 112-second sub-box;

[0053] 20-battery module;

[0054] 30 - battery cell; 31 - shell; 311 - housing; 312 - end cap; 32 - electrode assembly; 321 - electrode body; 322 - pole ear; 33 - electrode terminal;

[0055] 40-heat equalizing member; 41-first outer shell; 41a-first hollow cavity; 411-first wall; 411a-first surface; 412-second wall; 42-hydrophobic layer; 43-capillary structure; 44-hydrophilic layer;

[0056] 50- heat exchange member; 51- second outer shell; 51a- second hollow cavity; 52- phase change member;

[0057] G - direction of gravity. DETAILED DESCRIPTION

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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).

[0064] The battery apparatus 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 multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0065] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0074] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0075] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0076] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium with surface silver plating may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used.

[0078] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0079] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, carbon electrode, carbon, nickel or titanium.

[0080] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0081] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0082] In some embodiments, the diaphragm is an isolation membrane. The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0083] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0084] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0085] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0086] In some embodiments, the electrode assembly is a laminate structure.

[0087] In some embodiments, the battery cell 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.

[0088] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0089] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collector. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0090] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0091] 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.

[0092] During the cycle operation of the battery device, the battery cells will generate heat. Usually, a heat spreader is provided to balance the temperature of multiple battery cells. The first working fluid inside the heat spreader is condensed or evaporated to transfer heat with the battery cells, so that the temperature difference of multiple battery cells is as small as possible. The heat exchange between the heat exchanger and the heat spreader can cool down or heat up the battery cells.

[0093] However, in the related art, the liquid first working fluid of the heat spreader is usually spread flat inside the heat spreader, forming thermal resistance on the heat transfer path between the heat spreader and the heat exchanger, reducing the heat transfer efficiency between the heat spreader and the heat exchanger, and failing to cool or heat the battery cell in time, seriously affecting the reliability performance of the battery device.

[0094] In view of this, the battery device provided in the embodiment of the present application includes a battery cell, a heat spreader and a heat exchanger. The heat spreader is thermally connected to the lower side of the battery cell along the direction of gravity. The heat spreader includes a first outer shell and a first working medium. The first outer shell has a first hollow cavity. The first working medium is accommodated in the first hollow cavity and is configured to be able to switch between liquid and vapor states. The heat exchanger is arranged on the side of the heat spreader facing away from the battery cell, and the heat spreader is thermally connected. The first outer shell has a first wall, and the first wall is arranged on the side of the first hollow cavity facing the heat exchanger. The heat spreader also includes a hydrophobic layer, and the hydrophobic layer is arranged on the side of the first wall facing the first hollow cavity. The hydrophobic layer is configured to enable the liquid first working medium to condense into droplets.

[0095] The battery device provided in the embodiment of the present application, by arranging a hydrophobic layer on the side of the first wall facing the first hollow cavity, so that the liquid first working fluid in the first hollow cavity drips onto the hydrophobic layer on the first wall under the action of gravity and condenses into droplets on the hydrophobic layer, which is beneficial to reducing the thermal resistance of heat transfer between the heat exchange component and the battery cell, and improving the heat transfer efficiency between the heat exchange component and the battery cell, and further helps to increase the rate of cooling or heating of the battery cell, and timely cool or heat the battery cell, so that the battery cell works at a suitable temperature, which is beneficial to improve the reliability performance of the battery device.

[0096] The technical solutions described in the embodiments of the present application are applicable to battery devices, thermal management components of battery devices, and electrical devices using battery devices.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] Please refer to Figure 1 , Figure 1A 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.

[0101] 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.

[0102] 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 .

[0103] 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 3 Schematic 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] The electrode assembly 32 is a component in the battery cell 30 where electrochemical reactions occur. 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 connect the electrode terminals 33 to form a current loop.

[0110] First, as Figure 5 and Figure 6As shown, the battery device 10 provided in the embodiment of the present application includes a battery cell 30, a heat spreader 40 and a heat exchanger 50. The heat spreader 40 is thermally connected to the lower side of the battery cell 30 along the gravity direction G. The heat spreader 40 includes a first outer shell 41 and a first working medium. The first outer shell 41 has a first hollow cavity 41a. The first working medium is accommodated in the first hollow cavity 41a and is configured to be able to switch between liquid and gaseous states. The heat exchanger 50 is arranged on the side of the heat spreader 40 facing away from the battery cell 30 and is thermally connected to the heat spreader 40. The first outer shell 41 has a first wall 411, which is arranged on the side of the first hollow cavity 41a facing the heat exchanger 50. The heat spreader 40 also includes a hydrophobic layer 42, which is arranged on the side of the first wall 411 facing the first hollow cavity 41a. The hydrophobic layer 42 is configured to enable the liquid first working medium to condense into droplets.

[0111] The battery device 10 may have a housing 11, and the battery cells 30, the heat spreader 40 and the heat exchanger 50 may be accommodated in the housing 11. Alternatively, the heat exchanger 50 may be integrated with the housing 11, and of course, the heat spreader 40 and the heat exchanger 50 may also be integrated on the housing 11.

[0112] The heat spreader 40 is thermally connected to the lower part of the battery cell 30 along the gravity direction G, and the heat spreader 40 can be thermally connected to the lower part of the battery cell 30 along the gravity direction G. For example, the heat spreader 40 can be directly attached to the battery cell 30, or the heat spreader 40 can be thermally connected to the bottom of the battery cell 30 along the gravity direction G through a related heat conductive structure. The heat spreader 40 is thermally connected to the battery cell 30, and the heat spreader 40 can exchange heat with the battery cell 30. In this way, when the temperature of the battery cell 30 is high, the heat spreader 40 can cool the battery cell 30, and when the temperature of the battery cell 30 is low, the heat spreader 40 can heat the battery cell 30.

[0113] The heat exchange member 50 is disposed on the side of the heat spreader 40 facing away from the battery cell 30, and the heat exchange member 50 is disposed below the heat spreader 40 along the gravity direction G. The heat exchange member 50 is thermally connected to the heat spreader 40, and the heat exchange member 50 can exchange heat with the heat spreader 40. Since the heat spreader 40 can exchange heat with the battery cell 30, the heat exchange member 50 can exchange heat with the battery cell 30 through the heat spreader 40, so that the battery cell 30 works at a suitable temperature.

[0114] The heat exchanger 50 is connected to the heat equalizer 40 by heat conduction. Optionally, the heat exchanger 50 and the heat equalizer 40 can be processed and formed separately and then directly attached together, or connected to each other through a heat conduction structure. Alternatively, the heat exchanger 50 and the heat equalizer 40 can be integrally formed.

[0115] The heat spreader 40 includes a first outer shell 41, and the first outer shell 41 has a hollow cavity. Optionally, the first outer shell 41 may have one hollow cavity, or the first outer shell 41 may have multiple hollow cavities, and the orthographic projection of one hollow cavity along the gravity direction G may cover multiple battery cells 30. Exemplarily, the heat spreader 40 may have only one hollow cavity, and the orthographic projection of one hollow cavity along the gravity direction G covers all battery cells 30 in the battery device 10.

[0116] The heat equalizing member 40 includes a first working medium, which is contained in the first hollow cavity 41a and is configured to be convertible between liquid and vapor. In this way, in the area where the temperature of the battery cell 30 is higher, the first working medium in the corresponding hollow cavity evaporates, converts from liquid to vapor, and absorbs the heat in the battery cell 30. Since the first working medium in vapor state can flow in the first hollow cavity 41a, the first working medium in vapor state will condense when it flows to the area corresponding to the battery cell 30 with lower temperature, and release heat to the battery cell 30 to heat the battery cell 30. In this way, the first working medium evaporates and flows repeatedly in the first hollow cavity 41a, and condenses in the area where the temperature of the battery cell 30 is lower. The first working medium repeatedly absorbs and releases heat to balance the temperature of the battery cells 30 in different areas, so that the temperature of the battery cells 30 in different areas is more uniform, which is conducive to improving the temperature uniformity and reliability of the battery cells 30.

[0117] In addition, since the heat exchange component 50 is thermally connected to the heat equalizing component 40, the heat equalizing component 40 can be heated or cooled by heat exchange between the heat exchange component 50 and the heat equalizing component 40, and then the heat equalizing component 40 heats and cools the battery cell 30 through heat exchange with the battery cell 30. Therefore, the heat equalizing component 40 can also play a role in heat transfer between the heat exchange component 50 and the battery cell 30, so that the heat exchange component 50 can heat or cool the battery cell 30 through the heat equalizing component 40.

[0118] Therefore, the heat equalizing element 40 in the present application can not only balance the temperature of the battery cells 30 in different regions, but also transfer heat between the heat exchange element 50 and the battery cells 30 .

[0119] The first working medium may be ordinary water, or may be plasma water, etc. The first hollow cavity 41a may be closed, and the first working medium is closed in the first hollow cavity 41a.

[0120] The first outer shell 41 has a first wall 411, which is disposed on the side of the first hollow cavity 41a facing the heat exchanger 50, and is located below the first outer shell 41 and is thermally connected to the heat exchanger 50. The first wall 411 is a part of the heat transfer path between the heat exchanger 50 and the battery cell 30.

[0121] The hydrophobic layer 42 is arranged on the side of the first wall 411 facing the first hollow cavity 41a. After the first working medium in the first hollow cavity 41a is condensed into droplets, it will drip onto the hydrophobic layer 42 under the action of gravity. The hydrophobic layer 42 is hydrophobic. The droplet-shaped first working medium has a large contact angle with the hydrophobic layer 42, and it is difficult to spread into a thin layer on the first wall 411, but condenses into larger droplets. In this way, it is helpful to reduce the risk of the liquid first working medium spreading into a layer on the hydrophobic layer 42, and then it is helpful to reduce the thermal resistance of the heat exchange between the heat exchange element 50 and the heat equalizing element 40, and then it is helpful to improve the efficiency of the heat exchange between the heat exchange element 50 and the battery cell 30, and it can timely cool or heat the battery cell 30, so as to improve the reliability of the battery cell 30.

[0122] Optionally, a hydrophobic layer 42 may be provided on the surface of the first wall 411 facing the first hollow cavity 41a, or a hydrophobic layer 42 may be provided on a partial area of ​​the surface of the first wall 411 facing the first hollow cavity 41a, while the hydrophobic layer 42 may not be provided in other areas, which can be selected according to specific needs.

[0123] The heat exchanger 50 can be selected in a structural form according to actual needs. For example, a flow channel can be provided in the heat exchanger 50 to heat or cool the battery cell 30 through the fluid flowing through the flow channel. Alternatively, an energy storage component can be provided in the heat exchanger 50 to cool the battery cell 30 by absorbing heat from the energy storage component, or to heat the battery cell 30 by releasing heat from the energy storage component.

[0124] The battery device 10 provided in the embodiment of the present application is provided with a hydrophobic layer 42 on the side of the first wall 411 facing the first hollow cavity 41a, so that the liquid first working fluid in the first hollow cavity 41a drips onto the hydrophobic layer 42 on the first wall 411 under the action of gravity and condenses into droplets on the hydrophobic layer 42, which is beneficial to reducing the thermal resistance of heat transfer between the heat exchange component 50 and the battery cell 30, and improving the heat transfer efficiency between the heat exchange component 50 and the battery cell 30, and further beneficial to increasing the rate of cooling or heating of the battery cell 30, and timely cooling or heating the battery cell 30, so that the battery cell 30 works at a suitable temperature, which is beneficial to improving the reliability performance of the battery device 10.

[0125] In some embodiments, Figure 5 and Figure 7 As shown, the first outer shell 41 also has a second wall 412, which is arranged on the side of the first hollow cavity 41a facing away from the first wall 411. The heat equalizing member 40 also includes a capillary structure 43, which is arranged on the side of the second wall 412 facing the first hollow cavity 41a and is spaced apart from the hydrophobic layer 42.

[0126] The capillary structure 43 may include a plurality of capillary channels and may generate a capillary action. Thus, after the liquid first working medium on the hydrophobic layer 42 condenses into droplets, as the droplets gradually grow, the droplets gradually contact the capillary structure 43, and under the capillary action of the capillary structure 43 on the droplets, the capillary structure 43 generates an attraction for the droplets, and the liquid first working medium moves upward along the gravity direction G and is stored in the capillary channel of the capillary structure 43. Thus, the liquid first working medium is adsorbed and stored by the capillary structure 43, the amount of the liquid first working medium remaining on the first wall 411 is reduced, and the risk of forming a thin layer of liquid on the first wall 411 is further reduced, thereby reducing the thermal resistance between the heat transfer element and the battery cell 30.

[0127] It is understandable that after the liquid first working medium is stored in the capillary structure 43, when the monomer temperature is high, the liquid first working medium in the capillary structure 43 will evaporate and emit from the capillary structure 43 and flow in the first hollow cavity 41a.

[0128] Therefore, by setting up a capillary structure 43 to perform capillary adsorption and storage on the droplets condensed on the hydrophobic layer 42, it is beneficial to further reduce the risk of the liquid first working medium forming a liquid thin layer on the side of the first hollow cavity 41a close to the heat transfer element, which is further beneficial to reducing the thermal resistance between the heat transfer element and the battery cell 30, which is beneficial to improving the heat exchange efficiency between the heat transfer element and the battery cell 30, and further beneficial to improving the reliability performance of the battery device 10.

[0129] In some embodiments, the capillary structure 43 includes at least one of a metal mesh, a groove structure, and a sintered ceramic.

[0130] The metal mesh, the groove structure and the sintered ceramic structure can form more microscopic capillary channels, and the structure of the formed capillary channels is relatively stable, so that the capillary structure 43 can still provide a stable capillary effect after the battery device 10 cycles for many times. Moreover, more microscopic capillary channels can capillarily adsorb more droplets of the first working fluid.

[0131] Therefore, providing the capillary structure 43 with at least one of a metal mesh, a groove structure and a sintered ceramic is beneficial to improving the structural stability of the capillary structure 43 , so as to improve the reliability of the capillary structure 43 in absorbing and storing the liquid first working medium.

[0132] In some embodiments, Figure 5 and Figure 8 As shown, the heat exchange element 50 further includes a hydrophilic layer 44 , and the hydrophilic layer 44 is disposed between the capillary structure 43 and the second wall 412 .

[0133] The hydrophilic layer 44 has good hydrophilicity. The hydrophilic layer 44 is arranged between the capillary structure 43 and the second wall 412. After the capillary structure 43 adsorbs the liquid first working medium, the hydrophilic layer 44 generates an attraction for the liquid first working medium in the capillary structure 43, so that the liquid first working medium can be more stably retained in the capillary structure 43, further reducing the risk of the liquid first working medium accumulating at the bottom of the first hollow cavity 41a.

[0134] In some embodiments, the hydrophilic layer 44 includes at least one of a polyvinyl alcohol layer, a polyacrylic acid layer, and a hydrophilic oxide layer.

[0135] It can be understood that polyvinyl alcohol, polyacrylic acid and hydrophilic oxide have good hydrophilicity. Therefore, the polyvinyl alcohol layer, polyacrylic acid layer and hydrophilic oxide layer have good attraction for the liquid first working medium in the capillary structure 43, so that the liquid first working medium can be more stably retained in the capillary structure 43.

[0136] In some embodiments, the hydrophobic layer 42 includes at least one of a fluorosilane coating layer and a super-hydrophobic nano-layer.

[0137] Fluorosilane coating and super-hydrophobic nanomaterials are relatively cheap and easy to obtain. The fluorosilane coating layer and super-hydrophobic nanolayer formed by them have good hydrophobicity, so that the liquid first working medium has a larger contact angle with the hydrophobic layer 42, which makes it easier for the liquid first working medium to condense into larger droplets on the hydrophobic layer 42. In this way, while reducing the production cost of the battery device 10, it is also beneficial to further reduce the risk of the liquid first working medium spreading on the bottom of the first hollow cavity 41a.

[0138] In some embodiments, the first working fluid includes deionized water.

[0139] Deionized water has a relatively stable boiling point and condensation point under a specific pressure. Setting the first working medium to include deionized water facilitates timely evaporation and condensation of the deionized water, and timely cooling or heating of the battery cells 30, so as to more accurately balance the temperature of the battery cells 30 in different areas.

[0140] In some embodiments, Figure 5 and Fig. 9 As shown, the heat exchange element 50 includes a second outer shell 51 and a phase change element 52. The second outer shell 51 has a second hollow cavity 51a. The phase change element 52 is disposed in the second hollow cavity 51a. The phase change element 52 is configured to be able to switch between solid and liquid states.

[0141] Optionally, the second outer shell 51 and the first outer shell 41 may be formed separately and then connected by thermal conduction, or the second outer shell 51 and the first outer shell 41 may be integrated together to simplify the structure of the battery device 10 .

[0142] The phase change member 52 is disposed in the second hollow cavity 51a and can be converted between solid and liquid states. The phase change member 52 absorbs heat in the process of converting from solid to liquid. When the temperature of the battery cell 30 is high, the heat of the battery cell 30 is transferred to the phase change member 52 through the heat spreader 40. The phase change member 52 absorbs heat and converts from solid to liquid. In this way, the battery cell 30 is cooled by the phase change of the phase change member 52.

[0143] Optionally, the second outer shell 51 may have a second hollow cavity 51a, and the phase change element 52 may be filled in the hollow cavity. Alternatively, the second outer shell 51 may have a plurality of second hollow cavities 51a arranged at intervals, and each second hollow cavity 51a may be filled with a phase change element 52.

[0144] For example, the second hollow cavity 51a may be arranged to cover the first hollow cavity 41a along the gravity direction G, and the phase change member 52 may be arranged to fill each area in the second hollow cavity 51a, so that when the temperature of the battery cell 30 in any area is too high, the heat can be transferred to the phase change member 52. Alternatively, the second hollow cavity 51a may be arranged in an area where the battery cell 30 is prone to high temperature, and the phase change member 52 may be filled in the hollow cavity, so that when the temperature of the battery cell 30 in the corresponding area is high, the battery cell 30 can be cooled down in time through the phase change member 52 in the corresponding area.

[0145] The phase change element 52 can be sealed and stored in the second hollow cavity 51 a . When the phase change element 52 cools the battery cell 30 , the heat exchange element 50 does not need to exchange heat with external related mechanisms, which helps to simplify the structure of the battery device 10 .

[0146] Therefore, the heat exchange element 50 including the second outer shell 51 and the phase change element 52 is provided, which is beneficial to simplifying the structure of the battery device 10 and facilitating timely cooling of the battery cells 30 to further improve the reliability of the battery device 10 .

[0147] In some embodiments, the phase change member 52 includes at least one of paraffin wax or expanded graphite.

[0148] It is understandable that paraffin wax and expanded graphite are relatively cheap and easy to obtain, which is conducive to reducing the production cost of the battery device 10. Paraffin wax and expanded graphite have a relatively suitable melting point, so that when the temperature of the battery cell 30 is high, the phase change element 52 is promptly converted from solid to liquid and absorbs heat, so as to facilitate timely cooling of the battery cell 30.

[0149] Therefore, configuring the phase change element 52 to include at least one of paraffin wax or expanded graphite is beneficial to reducing the production cost of the battery device 10 , and facilitates the phase change element 52 to cool down the battery cells 30 in a timely manner, which is further beneficial to improving the reliability of the battery device 10 .

[0150] In some embodiments, the orthographic projection of the hydrophobic layer 42 along the gravity direction G covers at least a portion of the phase change element 52 .

[0151] Optionally, the orthographic projection of the hydrophobic layer 42 along the gravity direction G may cover all the phase change elements 52 , or the orthographic projection of the hydrophobic layer 42 along the gravity direction G may cover part of the phase change elements 52 .

[0152] It is understandable that the droplets of the first working fluid in the first hollow cavity 41a can condense into droplets on the hydrophobic layer 42 instead of being spread into a thin layer. The hydrophobic layer 42 is arranged to cover at least part of the phase change element 52 along the gravity direction G. In the process of the heat exchange element 50 absorbing the heat of the battery cell 30 through the phase change element 52, it is beneficial to reduce the thermal resistance of the heat exchange path between the battery cell 30 and the phase change element 52, and further help to improve the heat exchange efficiency between the phase change element 52 and the battery cell 30.

[0153] In some embodiments, the battery device 10 includes a plurality of battery cells 30 , and an orthographic projection of one first hollow cavity 41 a along the gravity direction G covers the plurality of battery cells 30 .

[0154] After evaporating into a vapor state, the first working medium in a hollow cavity can flow freely in the first hollow cavity 41 a . The flow of the vapor state first working medium in the first hollow cavity 41 a can balance the temperature of the battery cell 30 corresponding to the first hollow cavity 41 a .

[0155] Therefore, a first hollow cavity 41a is provided whose orthographic projection along the gravity direction G covers multiple battery cells 30 , and the first working medium in the corresponding first hollow cavity 41a can balance the temperature of the corresponding multiple battery cells 30 , which is beneficial to further improve the temperature uniformity of the multiple battery cells 30 .

[0156] In some embodiments, Figure 8 As shown, the first wall 411 has a first surface 411 a , which is located on a side of the first wall 411 facing the first hollow cavity 41 a , and the hydrophobic layer 42 covers the entire first surface 411 a .

[0157] The hydrophobic layer 42 covers the entire first surface 411a, and the liquid first working medium in the first hollow cavity 41a falls onto the hydrophobic layer 42 under the action of gravity. Due to the hydrophobicity of the hydrophobic layer 42, the liquid first working medium condenses into droplets on the hydrophobic layer 42 instead of being spread into a thin layer, which is beneficial to further reduce the thermal resistance on the heat transfer path between the heat exchange component 50 and the battery cell 30, so as to improve the efficiency of heat exchange between the battery cell 30 and the heat exchange component 50.

[0158] In the second aspect, the thermal management component provided in the embodiment of the present application is used for the battery device 10, and the thermal management component includes a heat spreader 40 and a heat exchanger 50. The heat spreader 40 is thermally connected to the lower side of the battery cell 30 along the gravity direction G. The heat spreader 40 includes a first outer shell 41 and a first working medium. The first outer shell 41 has a first hollow cavity 41a. The first working medium is accommodated in the first hollow cavity 41a and is configured to be able to switch between liquid and gaseous states. The heat exchanger 50 is arranged on the side of the heat spreader 40 facing away from the battery cell 30 and is thermally connected to the heat exchanger 50. The first outer shell 41 has a first wall 411, which is arranged on the side of the first hollow cavity 41a facing the heat exchanger 50. The heat spreader 40 also includes a hydrophobic layer 42, which is arranged on the side of the first wall 411 facing the first hollow cavity 41a. The hydrophobic layer 42 is configured to enable the liquid first working medium to condense into droplets.

[0159] The thermal management component provided in the embodiment of the present application is provided with a hydrophobic layer 42 on the side of the first wall 411 facing the first hollow cavity 41a. When the thermal management component is applied to the battery device 10, the liquid first working fluid in the first hollow cavity 41a drips onto the hydrophobic layer 42 on the first wall 411 under the action of gravity and condenses into droplets on the hydrophobic layer 42, which is beneficial to reduce the thermal resistance of heat transfer between the heat exchange component 50 and the battery cell 30, and improve the heat transfer efficiency between the heat exchange component 50 and the battery cell 30, which is beneficial to increase the rate of cooling or heating of the battery cell 30, and timely cool or heat the battery cell 30, so that the battery cell 30 works at a suitable temperature, which is beneficial to improve the reliability performance of the battery device 10.

[0160] In some embodiments, the first outer shell 41 also has a second wall 412, which is arranged on the side of the first hollow cavity 41a facing away from the first wall 411. The heat equalizing member 40 also includes a capillary structure 43, which is arranged on the side of the second wall 412 facing the first hollow cavity 41a and is spaced apart from the hydrophobic layer 42.

[0161] By providing a capillary structure 43 to perform capillary adsorption and storage on the droplets condensed on the hydrophobic layer 42, it is beneficial to further reduce the risk of the liquid first working medium forming a thin liquid layer on the side of the first hollow cavity 41a close to the heat transfer element, further help to reduce the thermal resistance between the heat transfer element and the battery cell 30, help to improve the heat exchange efficiency between the heat transfer element and the battery cell 30, and further help to improve the reliability performance of the battery device 10.

[0162] In some embodiments, the heat exchange element 50 further includes a hydrophilic layer 44 , which is disposed between the capillary structure 43 and the second wall 412 .

[0163] The hydrophilic layer 44 has good hydrophilicity. The hydrophilic layer 44 is arranged between the capillary structure 43 and the second wall 412. After the capillary structure 43 adsorbs the liquid first working medium, the hydrophilic layer 44 generates an attraction for the liquid first working medium in the capillary structure 43, so that the liquid first working medium can be more stably retained in the capillary structure 43, further reducing the risk of the liquid first working medium accumulating at the bottom of the first hollow cavity 41a.

[0164] In a third 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.

[0165] 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.

[0166] In some embodiments, Figures 5 to 9As shown, the battery device 10 includes a battery cell 30, a heat spreader 40 and a heat exchanger 50. The heat spreader 40 is thermally connected to the lower side of the battery cell 30 along the gravity direction G. The heat spreader 40 includes a first outer shell 41, a capillary structure 43, a hydrophobic layer 42, a hydrophilic layer 44 and a first working medium. The first outer shell 41 has a first hollow cavity 41a. The first working medium is contained in the first hollow cavity 41a and is configured to be able to switch between liquid and gaseous states. The heat exchanger 50 is arranged on the side of the heat spreader 40 facing away from the battery cell 30 and is thermally connected to the heat spreader 40. The first outer shell 41 has a first wall 411 and a second wall 412. The first wall 411 is arranged on the side of the first hollow cavity 41a facing the heat exchanger 50. The hydrophobic layer 42 is arranged on the side of the first wall 411 facing the first hollow cavity 41a. The hydrophobic layer 42 is configured to enable the liquid first working medium to condense into droplets. The second wall 412 is arranged on the side of the first hollow cavity 41a facing away from the first wall 411, the capillary structure 43 is arranged on the side of the second wall 412 facing the first hollow cavity 41a, and is spaced apart from the hydrophobic layer 42, and the hydrophilic layer 44 is arranged between the capillary structure 43 and the second wall 412. The capillary structure 43 includes at least one of a metal mesh, a groove structure and a sintered ceramic, the hydrophilic layer 44 includes at least one of a polyvinyl alcohol layer, a polyacrylic acid layer and a hydrophilic oxide layer, the hydrophobic layer 42 includes at least one of a fluorosilane coating layer and a super-hydrophobic nanolayer, and the first working medium includes deionized water. The heat exchanger 50 includes a second outer shell 51 and a phase change member 52, the second outer shell 51 has a second hollow cavity 51a, the phase change member 52 is arranged in the second hollow cavity 51a, the phase change member 52 is configured to be able to switch between solid and liquid states, and the phase change member 52 includes at least one of paraffin and expanded graphite. The orthographic projection of the hydrophobic layer 42 along the gravity direction G covers at least a portion of the phase change element 52 . The orthographic projection of one first hollow cavity 41 a along the gravity direction G covers a plurality of battery cells 30 .

[0167] The battery device 10 provided in the embodiment of the present application is provided with a hydrophobic layer 42 on the side of the first wall 411 facing the first hollow cavity 41a, so that the liquid first working fluid in the first hollow cavity 41a drips onto the hydrophobic layer 42 on the first wall 411 under the action of gravity and condenses into droplets on the hydrophobic layer 42, which is beneficial to reducing the thermal resistance of heat transfer between the heat exchange component 50 and the battery cell 30, and improving the heat transfer efficiency between the heat exchange component 50 and the battery cell 30, and further beneficial to increasing the rate of cooling or heating of the battery cell 30, and timely cooling or heating the battery cell 30, so that the battery cell 30 works at a suitable temperature, which is beneficial to improving the reliability performance of the battery device 10.

[0168] 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: Battery cells; A heat spreader, thermally connected to the lower side of the battery cell along the gravity direction, the heat spreader comprising a first outer shell and a first working medium, the first outer shell having a first hollow cavity, the first working medium being accommodated in the first hollow cavity and configured to be convertible between liquid and vapor states; A heat exchange member, disposed on a side of the heat spreader facing away from the battery cell and thermally connected to the heat spreader; The first outer shell has a first wall, which is arranged on a side of the first hollow cavity facing the heat exchange element. The heat equalizing element also includes a hydrophobic layer, which is arranged on a side of the first wall facing the first hollow cavity. The hydrophobic layer is configured to enable the liquid first working medium to condense into droplets.

2. The battery device according to claim 1, characterized in that: The first outer shell also has a second wall, which is arranged on the side of the first hollow cavity facing away from the first wall. The heat spreader also includes a capillary structure, which is arranged on the side of the second wall facing the first hollow cavity and is spaced apart from the hydrophobic layer.

3. The battery device according to claim 2, characterized in that: The capillary structure includes at least one of a metal mesh, a groove structure, and sintered ceramics.

4. The battery device according to claim 2, characterized in that: The heat exchange element further includes a hydrophilic layer, and the hydrophilic layer is arranged between the capillary structure and the second wall.

5. The battery device according to claim 4, characterized in that: The hydrophilic layer includes at least one of a polyvinyl alcohol layer, a polyacrylic acid layer, and a hydrophilic oxide layer.

6. The battery device according to claim 1, characterized in that: The hydrophobic layer includes at least one of a fluorosilane coating layer and a super-hydrophobic nano-layer.

7. The battery device according to claim 1, characterized in that: The first working medium includes deionized water.

8. The battery device according to any one of claims 1 to 7, characterized in that: The heat exchange element comprises a second outer shell and a phase change element. The second outer shell has a second hollow cavity. The phase change element is arranged in the second hollow cavity. The phase change element is configured to be convertible between a solid state and a liquid state.

9. The battery device according to claim 8, characterized in that: The phase change member includes at least one of paraffin wax and expanded graphite.

10. The battery device according to claim 8, characterized in that: The orthographic projection of the hydrophobic layer along the gravity direction covers at least a portion of the phase change element.

11. The battery device according to any one of claims 1 to 7, characterized in that: The battery device includes a plurality of battery cells, and an orthographic projection of one first hollow cavity along the gravity direction covers the plurality of battery cells.

12. The battery device according to any one of claims 1 to 7, characterized in that: The first wall has a first surface, the first surface is located on a side of the first wall facing the first hollow cavity, and the hydrophobic layer covers the entire first surface.

13. A thermal management component, characterized in that: For a battery device, the thermal management component comprises: a heat spreader, thermally connected to the lower side of the battery cell of the battery device along the gravity direction, the heat spreader comprising a first outer shell and a first working medium, the first outer shell having a first hollow cavity, the first working medium being accommodated in the first hollow cavity and configured to be convertible between liquid and vapor; A heat exchange member, disposed on a side of the heat distribution member facing away from the battery cell and thermally connected to the heat exchange member; The first outer shell has a first wall, which is arranged on a side of the first hollow cavity facing the heat exchange element. The heat equalizing element also includes a hydrophobic layer, which is arranged on a side of the first wall facing the first hollow cavity. The hydrophobic layer is configured to enable the liquid first working medium to condense into droplets.

14. The thermal management assembly according to claim 13, characterized in that The first outer shell also has a second wall, which is arranged on the side of the first hollow cavity facing away from the first wall. The heat spreader also includes a capillary structure, which is arranged on the side of the second wall facing the first hollow cavity and is spaced apart from the hydrophobic layer.

15. The thermal management assembly of claim 14, wherein: The heat exchange element further includes a hydrophilic layer, and the hydrophilic layer is arranged between the capillary structure and the second wall.

16. An electrical device, characterized in that: The invention comprises a battery device as claimed in any one of claims 1 to 12, wherein the battery device is used to provide electrical energy.

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