Battery device, heat management assembly and power utilization device with battery device

Abstract

The utility model relates to a battery device, a heat management assembly and an electric device with the battery device. The battery device comprises a box body, a battery monomer and the heat management assembly, the box body is provided with an accommodating space for accommodating a battery monomer, the heat management assembly is connected with the box body, and the heat management assembly comprises a bearing plate, a heat management part and a hydrophobic layer. The bearing plate is provided with a first face and a second face which are oppositely arranged in the first direction. The heat management part is arranged on one side of the second face of the bearing plate and fixedly connected with the bearing plate. A fluid channel used for containing a cooling medium is formed between the heat management component and the bearing plate. The hydrophobic layer completely covers the surface of the side, away from the bearing plate, of the heat management component. When the battery device provided by the utility model is mounted on an electric device, the whole heat management component can be protected by the hydrophobic layer in cold winter, so that the phenomenon that the whole heat management component is damaged due to water seepage is reduced, the risk of leakage of a cooling medium is reduced, and the battery is safer in the use process.

Description

Technical Field

[0001] This application relates to the field of battery heat dissipation technology, and in particular to battery devices, thermal management components, and electrical devices having the battery device. Background Technology

[0002] In the use of high-power batteries, cooling is necessary to ensure safety and extend their lifespan. Most related technologies utilize thermal management components equipped with coolant for heat dissipation. However, in cold winter weather, these components are prone to freezing when in contact with water. Prolonged freezing can lead to water leakage and damage, making it difficult to ensure adequate cooling during later battery use, which is dangerous. This also places higher demands on the corrosion resistance of the thermal management components, making their manufacturing process more complex and increasing their cost. Utility Model Content

[0003] In view of the above problems, this application provides a battery device that can alleviate the icing phenomenon of the thermal management component during use when the battery is cooled, reduce the possibility of water leakage damage to the thermal management component, and make the battery safer to use; at the same time, it reduces the corrosion resistance requirements of the thermal management component, effectively reducing the manufacturing difficulty and cost of the thermal management component.

[0004] In a first aspect, this application provides a battery device including a housing, a battery cell, and a thermal management assembly. The housing has a receiving space, in which the battery cell is housed. The thermal management assembly is connected to the housing and includes a support plate, a thermal management component, and a hydrophobic layer. The support plate has a first surface and a second surface disposed opposite to each other along a first direction. The thermal management component is disposed on one side of the second surface of the support plate and is fixedly connected to the support plate. A fluid channel for receiving a cooling medium is formed between the thermal management component and the support plate. The hydrophobic layer completely covers the surface of the thermal management component facing away from the support plate.

[0005] The battery device provided in this embodiment is installed on an electrical device to cool the battery cells during use. In this case, the first surface of the support plate is the side closest to the battery cell, while the hydrophobic layer is in contact with the external environment. During cold winters, because the hydrophobic layer completely covers the thermal management component, the entire component is protected. When the hydrophobic layer comes into contact with water from the external environment, it is difficult for the water to freeze at the hydrophobic layer, thus reducing the risk of water seepage damage to the entire thermal management component and lowering the risk of cooling medium leakage. This allows the battery cells to receive sufficient cooling and heat dissipation during subsequent use, making the process safer. Furthermore, it reduces the corrosion resistance requirements of the thermal management component, effectively lowering the manufacturing difficulty and cost.

[0006] In some embodiments, the hydrophobic layer includes a coating body and a plurality of hydrophobic protrusions, which are spaced apart from each other on the side of the coating body away from the thermal management component.

[0007] By setting the hydrophobic layer as the coating body and the hydrophobic protrusions protruding on the coating body, the entire hydrophobic layer is divided into different blocks by multiple hydrophobic protrusions arranged at intervals, reducing the possibility of water freezing in small pieces on the hydrophobic layer and connecting into large sheets, thus making the hydrophobic layer more effective.

[0008] In some embodiments, the average height h of the plurality of hydrophobic protrusions along a first direction satisfies the condition: 10μm≤h≤20μm; wherein, the first direction is the direction in which the top of the hydrophobic protrusion points to the side of the coating body away from the thermal management component.

[0009] By setting the average height h of multiple hydrophobic protrusions within a range of greater than or equal to 10 μm and less than or equal to 20 μm, the height of the hydrophobic protrusions is kept within a small range, and a dense microstructure is formed on the entire surface of the hydrophobic layer. This size is close to the height of the papillary structure on the surface of a lotus leaf, enabling the hydrophobic layer to achieve a superhydrophobic effect similar to that of a lotus leaf.

[0010] In some embodiments, the average maximum length L of the plurality of hydrophobic protrusions along the second direction satisfies the condition: 6μm≤L≤8μm; the second direction is perpendicular to the first direction.

[0011] By setting the average maximum length L of multiple hydrophobic protrusions along the second direction within a range of greater than or equal to 6 μm and less than or equal to 8 μm, the length of the hydrophobic protrusions in their extension direction, i.e. the second direction, is within a small range. The entire surface of the hydrophobic layer forms a dense microstructure, the size of which is close to the diameter of the papillary structure on the surface of a lotus leaf, enabling the hydrophobic layer to achieve a superhydrophobic effect similar to that of a lotus leaf.

[0012] In some embodiments, the thickness d1 of the coating body satisfies the condition: 20μm≤d1≤200μm.

[0013] By setting the thickness d1 of the coating body within the range of greater than or equal to 20 μm and less than or equal to 200 μm, the overall thickness of the coating body is reduced. While satisfying the hydrophobic effect, the entire battery device is designed to be lightweight, which is beneficial for cost control.

[0014] In some embodiments, the thickness d1 of the coating body satisfies the condition: 100μm≤d1≤150μm.

[0015] By setting the thickness d1 of the coating body within the range of greater than or equal to 100 μm and less than or equal to 150 μm, the overall thickness of the coating body is reduced. While satisfying the hydrophobic effect, the entire battery device is designed to be lightweight, which is beneficial for cost control.

[0016] In some embodiments, the contact angle θ of the hydrophobic layer surface satisfies the condition: θ≥150°.

[0017] Since the contact angle θ of the hydrophobic layer surface is greater than or equal to 150°, it means that the hydrophobic layer and the droplet retained on its surface form an obtuse angle, and the two do not wet each other. The droplet tends to maintain a spherical shape and is not easy to spread on the hydrophobic layer, which makes the droplet on the hydrophobic layer easy to roll off and difficult to retain.

[0018] In some embodiments, the thermal management component includes a plurality of spacers and a plurality of connecting portions; the spacers are disposed facing the support plate in a first direction, and the connecting portions are connected between two adjacent spacers; the connecting portions are fixedly connected to the support plate, and any two adjacent connecting portions and the spacer located between the two adjacent connecting portions define a fluid channel.

[0019] By setting the thermal management component as multiple spacers and multiple connections, and defining the fluid channel by any two adjacent connections and the spacer between them, the formation of the fluid channel is simpler, more convenient, and easier to process and manufacture.

[0020] In some embodiments, the hydrophobic layer is bonded to the surface of the thermal management component on the side opposite to the support plate.

[0021] By ensuring the hydrophobic layer is fully aligned with the thermal management component, the protection effect on the thermal management component is improved.

[0022] In some embodiments, the thermal management component further includes a sacrificial layer disposed between the hydrophobic layer and the thermal management component.

[0023] If the hydrophobic layer is damaged or scratched during use, the sacrificial layer will be exposed. Since the sacrificial layer contains active elements, and due to the characteristics of metallic materials, the electrode potential of the sacrificial layer will be lower than that of ordinary Al alloy. Therefore, when electrochemical corrosion occurs, the sacrificial layer will corrode preferentially, thereby protecting the thermal management components and improving their corrosion resistance.

[0024] In some embodiments, the thickness d2 of the sacrificial layer satisfies the condition: 50μm≤d2≤250μm.

[0025] By setting the thickness d2 of the sacrificial layer to a range greater than or equal to 50 μm and less than or equal to 250 μm, the thickness range of the sacrificial layer is made more suitable and can meet the battery usage requirements during the normal warranty period.

[0026] In some embodiments, the thermal management component further includes an insulation layer disposed between the hydrophobic layer and the thermal management component.

[0027] By setting an insulation layer between the hydrophobic layer and the thermal management components, the hydrophobic layer is insulated and isolated, reducing the temperature difference between the two sides of the hydrophobic layer. This reduces the formation of condensation on the hydrophobic layer in low-temperature operating environments.

[0028] In some embodiments, the thickness d3 of the insulation layer satisfies the condition: 0.8mm≤d3≤2mm.

[0029] This application sets the thickness d3 of the insulation layer to a range greater than or equal to 0.8 mm and less than or equal to 2 mm, thereby making the thickness range of the insulation layer more suitable and able to meet the battery usage requirements during the normal warranty period.

[0030] In some embodiments, an insulating layer is provided on the first surface.

[0031] By setting an insulating layer on the first surface, the possibility of corrosion damage to the first surface is reduced. Furthermore, due to the improved wear resistance, it is easier to mount and install individual battery cells on its surface, while also making the entire battery device more aesthetically pleasing.

[0032] Secondly, this application also provides a thermal management assembly, which includes a support plate, a thermal management component, and a hydrophobic layer. The support plate has a first surface and a second surface disposed opposite to each other along a first direction; the thermal management component is disposed on one side of the second surface of the support plate and is fixedly connected to the support plate; a fluid channel for accommodating a cooling medium is formed between the thermal management component and the support plate; the hydrophobic layer completely covers the surface of the thermal management component facing away from the support plate.

[0033] The thermal management component provided in this application embodiment is installed on a battery device to cool the individual battery cells during use. In this case, the first surface of the support plate is the side closest to the individual battery cells, while the hydrophobic layer is in contact with the external environment. During cold winters, the entire thermal management component is protected by the hydrophobic layer because it completely covers the component. When the hydrophobic layer comes into contact with water from the external environment, it is difficult for the water to freeze at the hydrophobic layer, thus reducing the risk of water seepage damage to the entire thermal management component and lowering the risk of cooling medium leakage. This allows the battery to receive sufficient cooling and heat dissipation during subsequent use, making the process safer. Furthermore, it reduces the corrosion resistance requirements of the thermal management component, effectively lowering the manufacturing difficulty and cost.

[0034] Thirdly, this application also provides an electrical device comprising the battery device described in any of the above embodiments, the battery device being used to provide electrical energy to the electrical device. The first surface of the support plate is the side closest to the individual battery cells. During use, the hydrophobic layer of the battery device is in contact with the external environment. In colder winters, because the hydrophobic layer completely covers the thermal management components, the entire thermal management component is protected by the hydrophobic layer. When the hydrophobic layer comes into contact with water in the external environment, the water is unlikely to freeze at the hydrophobic layer, thereby reducing the possibility of water seepage damage to the entire thermal management component, reducing the risk of cooling medium leakage, and ensuring that the individual battery cells receive sufficient cooling and heat dissipation during subsequent use, making the process safer. Furthermore, it reduces the corrosion resistance requirements of the thermal management components, thereby effectively reducing the manufacturing difficulty and cost of the thermal management components, resulting in a lower overall cost for the electrical device.

[0035] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0036] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0037] Figure 1 This is a schematic diagram of the structure of a vehicle according to some embodiments of this application.

[0038] Figure 2 for Figure 1An exploded view of the battery housing and individual battery cells in the battery device shown.

[0039] Figure 3 This is a schematic diagram of a thermal management component in a battery device provided in some embodiments of this application.

[0040] Figure 4 for Figure 3 A top view of the thermal management components shown.

[0041] Figure 5 for Figure 4 The cross-sectional view of the thermal management component at point AA is shown.

[0042] Figure 6 A thermal management component provided in an embodiment of this application Figure 5 A magnified view of point B shown.

[0043] Figure 7 Thermal management components provided in other embodiments of this application Figure 5 A magnified view of point B shown.

[0044] Figure 8 Another embodiment of this application provides a thermal management component. Figure 5 A magnified view of point B shown.

[0045] Figure 9 for Figure 3 A schematic diagram of the contact angle of the surface of the hydrophobic layer in the thermal management component shown.

[0046] Figure 10 for Figure 3 A scanning electron microscope (SEM) schematic diagram of the hydrophobic protrusions on the hydrophobic layer in the thermal management component shown.

[0047] The reference numerals in the detailed embodiments are as follows:

[0048] 10000 - Vehicles;

[0049] 1000 - Battery assembly; 1100 - Housing; 1110 - Housing space; 1120 - First section; 1130 - Second section; 1200 - Individual battery cell;

[0050] 2000-Controller;

[0051] 3000-motor;

[0052] 100 - Support plate; 110 - First side; 120 - Second side;

[0053] 200 - Thermal management component; 210 - Fluid passage; 220 - Spacing part; 230 - Connection part;

[0054] 300 - Hydrophobic layer; 310 - Hydrophobic protrusion;

[0055] 400-Sacrificial Layer;

[0056] 500 - Insulation layer;

[0057] 600 - Weld layer. Detailed Implementation

[0058] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0060] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0061] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0063] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0064] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0065] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0066] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0067] When installing high-power battery packs composed of various power batteries in electric vehicles or military equipment, thermal management is required to ensure safety and extend service life. This is achieved through cooling and heat dissipation via thermal management components. Most related technologies utilize thermal management components equipped with coolant to dissipate heat from the battery. However, in cold winter weather, these components are prone to freezing when in contact with water. Prolonged freezing can lead to water leakage and damage, making it difficult to ensure adequate cooling and heat dissipation during extended battery use, which is dangerous. This also places higher demands on the corrosion resistance of the thermal management components, making their manufacturing process more complex and increasing their cost.

[0068] Based on the above considerations, in order to solve the problems that thermal management components are prone to water seepage damage during use, and that the manufacturing difficulty and cost of thermal management components are high, this application designs a battery device that reduces the possibility of water seepage damage to the thermal management component by reducing the possibility of ice formation on the surface of the thermal management component, thereby effectively improving the safety of the battery device during long-term use.

[0069] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. Specifically, the electrical device can be, but is not limited to, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. By using the battery device disclosed in this application to form the power system of the electrical device, it is beneficial to alleviate the icing phenomenon that occurs in the thermal management components of the battery device during use, reduce the possibility of water leakage damage to the thermal management components, and make the use of the battery device safer; at the same time, it also reduces the corrosion resistance requirements of the thermal management components, effectively reducing the manufacturing difficulty and cost of the thermal management components.

[0070] For ease of explanation, the following embodiments will be described using a vehicle 10000 as an example of an electrical device according to an embodiment of this application.

[0071] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 10000 provided in some embodiments of this application. The vehicle 10000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 1000 is installed inside the vehicle 10000, and the battery device 10000 can be located at the bottom, front, or rear of the vehicle 10000. The battery device 1000 can be used to power the vehicle 10000; for example, the battery device 10000 can serve as the operating power source for the vehicle 10000. The vehicle 10000 may also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery device 10000 to supply power to the motor 3000, for example, to meet the power needs of the vehicle 10000 during starting, navigation, and driving. In some embodiments of this application, the battery device 10000 can not only serve as the operating power source for the vehicle 10000, but also as the driving power source for the vehicle 10000, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle 10000.

[0072] Please see Figure 3-Figure 8 , Figure 3A schematic diagram of a thermal management component in a battery device provided in some embodiments of this application is shown. Figure 4 It shows Figure 3 A top view of the thermal management components shown. Figure 5 It shows Figure 4 The cross-sectional view of the thermal management component at point AA is shown. Figure 6 This application illustrates a thermal management component provided in one embodiment. Figure 5 A magnified view of point B shown. Figure 7 This application illustrates a thermal management component provided in another embodiment. Figure 5 A magnified view of point B shown. Figure 8 This application also illustrates a thermal management component according to another embodiment. Figure 5 A magnified view of point B shown.

[0073] The battery device 1000 provided in this application embodiment includes a housing 1100, a battery cell 1200, and a thermal management assembly. The housing 1100 has a receiving space 1110, within which the battery cell 1200 is housed. The thermal management assembly is connected to the housing 1100 and includes a support plate 100, a thermal management component 200, and a hydrophobic layer 300. The support plate 100 has a first surface 110 and a second surface 120 disposed opposite each other along a first direction; specifically, the first direction is... Figures 4-7 The thermal management component 200 is disposed on one side of the second surface 120 of the support plate 100 along the first direction and is fixedly connected to the support plate 100; a fluid channel 210 for accommodating the cooling medium is constructed between the thermal management component 200 and the support plate 100; the hydrophobic layer 300 completely covers the side surface of the thermal management component 200 away from the support plate 100.

[0074] Please refer to Figure 2 , Figure 2 It shows Figure 1The diagram shows an exploded view of the battery device 1000. The battery device 1000 includes a housing 1100 and individual battery cells 1200. The housing 1100 has a receiving space 1110, within which the individual battery cells 1200 are housed. The housing 1100 can have various structures. In some embodiments, the housing 1100 may include a first portion 1120 and a second portion 1130, which overlap each other, and together define the receiving space 1110 for accommodating the individual battery cells 1200. The second part 1130 can be a hollow structure with one end open, and the first part 1120 can be a plate-like structure. The first part 1120 covers the open side of the second part 1130 so that the first part 1120 and the second part 1130 together define the receiving space 1110. Alternatively, the first part 1120 and the second part 1130 can both be hollow structures with one side open, and the open side of the first part 1120 covers the open side of the second part 1130. Of course, the box 1100 formed by the first part 1120 and the second part 1130 can be of various shapes, such as a cylinder, a cuboid, etc.

[0075] In the battery device 1000, there can be multiple battery cells 1200. These multiple battery cells 1200 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that the multiple battery cells 1200 are connected in both series and parallel. The multiple battery cells 1200 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 1200 is housed within the housing 1100. Alternatively, the battery device 1000 can also consist of multiple battery cells 1200 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 1100. The battery device 1000 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 1200.

[0076] Each battery cell 1200 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 1200 can be cylindrical, flat, cuboid, or other shapes.

[0077] The thermal management component can be directly housed within the receiving space 1110 of the housing 1100 and fixedly connected to the frame beam of the housing 1100. This allows the thermal management component to directly form the base plate of the housing 1100, providing thermal management and load-bearing support for the battery cells 1200 housed within the receiving space 1110. This eliminates the need for an additional base plate in the housing 1100 of the battery device 1000, resulting in a lighter overall structure. Alternatively, when the housing 1100 itself has a base plate, the thermal management component can also be housed within the receiving space 1110 and positioned between the base plate and the battery cells 1200, thereby performing thermal management operations on the battery cells 1200.

[0078] The support plate 100 and the thermal management component 200 can be made of 3xxx series aluminum-magnesium-manganese alloy. This gives the sidewalls of the fluid channel 210 excellent rust prevention and anodizing properties.

[0079] In one specific embodiment, the support plate 100 and the thermal management component 200 are made of 3003 Mod alloy. Since 3003 Mod alloy is made by adding copper to 3003 alloy, the strength of the plate is improved. This results in high strength for the support plate 100 and the thermal management component 200, making them less prone to deformation during use and capable of supporting the large volume and weight of the battery device 1000.

[0080] The hydrophobic layer 300 can be directly sprayed onto the thermal management component 200 using a spraying process. The hydrophobic layer 300 can be made of spraying materials such as polytetrachloroethylene, polydimethylsiloxane, or polyaniline.

[0081] The battery device 1000 provided in this embodiment is installed on the battery device 1000 to cool the battery cells 1200 in the battery device 1000 during use. At this time, the first surface 110 is the side close to the battery cell 1200, while the hydrophobic layer 300 is in contact with the external environment. In cold winters, since the hydrophobic layer 300 completely covers the thermal management component 200, the entire thermal management component 200 is protected by the hydrophobic layer 300. When the hydrophobic layer 300 comes into contact with water in the external environment, the water is unlikely to freeze at the hydrophobic layer 300, thereby reducing the possibility of water seepage damage to the entire management component 200, reducing the risk of cooling medium leakage, and ensuring that the battery cell 1200 can receive sufficient cooling and heat dissipation during subsequent use, making the use process safer. It also reduces the corrosion resistance requirements of the thermal management component 200, thereby effectively reducing the manufacturing difficulty and cost of the thermal management component 200.

[0082] The specific structure of the battery device 1000 is described below.

[0083] In some embodiments, the hydrophobic layer 300 includes a coating body and a plurality of hydrophobic protrusions 310, which are spaced apart from each other on the side of the coating body away from the thermal management component 200.

[0084] The hydrophobic protrusions 310 can be designed to mimic the papillary structure of a lotus leaf, thereby promoting the detachment of droplets from the surface of the hydrophobic layer 300, preventing water droplet accumulation and condensation, and further enhancing the anti-icing capability of the surface of the hydrophobic layer 300.

[0085] By setting the hydrophobic layer 300 as the coating body and the hydrophobic protrusions 310 protruding on the coating body, the entire hydrophobic layer 300 is divided into different blocks by the multiple hydrophobic protrusions 310 arranged at intervals, reducing the possibility of water freezing in small pieces on the hydrophobic layer 300 and connecting into large sheets, thus making the hydrophobic effect of the hydrophobic layer 300 better.

[0086] Please see Figure 10 , Figure 10 It shows Figure 3 A scanning electron microscope (SEM) schematic diagram of the hydrophobic protrusions 310 on the hydrophobic layer 300 in the thermal management component shown. In some embodiments, the average height h of the plurality of hydrophobic protrusions 310 along a first direction satisfies the condition: 10 μm ≤ h ≤ 20 μm; wherein, the first direction is when the top of the hydrophobic protrusion 310 points to the side surface of the coating body opposite to the thermal management component 200.

[0087] The average height h of the multiple hydrophobic protrusions 310 can be calculated as follows: The heights of the top of each hydrophobic protrusion 310 from the surface of the coating body facing away from the thermal management component 200 are summed. Then, the sum is divided by the number of hydrophobic protrusions 310 to obtain the average height h of the multiple hydrophobic protrusions 310. Optionally, the height of each hydrophobic protrusion 310 can be obtained using a 3D modeling device such as a Zygo laser interferometer.

[0088] By setting the average height h of multiple hydrophobic protrusions 310 within a range of greater than or equal to 10 μm and less than or equal to 20 μm, the height of the hydrophobic protrusions 310 is kept within a small range, and a dense microstructure is formed on the entire surface of the hydrophobic layer 300. The size of this microstructure is close to the diameter of the papillary structure on the surface of a lotus leaf, enabling the hydrophobic layer 300 to achieve a superhydrophobic effect similar to that of a lotus leaf.

[0089] In one specific embodiment, the average height h of the plurality of hydrophobic protrusions 310 is 10 μm. In another specific embodiment, the average height h of the plurality of hydrophobic protrusions 310 is 20 μm. In yet another specific embodiment, the average height h of the plurality of hydrophobic protrusions 310 is 15 μm.

[0090] Please see Figure 10 In some embodiments, the average maximum length L of the plurality of hydrophobic protrusions 310 along the second direction satisfies the condition: 6μm≤L≤8μm; the second direction is perpendicular to the first direction. Specifically, the second direction is the extension direction of the hydrophobic protrusions 310, which is parallel to the side surface of the coating body facing away from the thermal management component 200.

[0091] The average maximum length L of the multiple hydrophobic protrusions 310 can be calculated as follows: The lengths of the roots of each hydrophobic protrusion 310 in the extending direction are summed, and then the sum is divided by the number of hydrophobic protrusions 310 to obtain the average maximum length L. Alternatively, the length of each hydrophobic protrusion 310 in the extending direction can be obtained using a 3D modeling device such as a Zygo laser interferometer to determine the base area of ​​each hydrophobic protrusion 310. The internal program can then directly calculate the length of the roots of each hydrophobic protrusion 310 in the extending direction, ultimately yielding the average maximum length L.

[0092] By setting the average maximum length L of multiple hydrophobic protrusions 310 within the range of greater than or equal to 6 μm and less than or equal to 8 μm, the length of the hydrophobic protrusions 310 in their extension direction is within a small range, and a dense microstructure is formed on the entire surface of the hydrophobic layer 300. The size of this microstructure is close to the diameter of the papillary structure on the surface of a lotus leaf, enabling the hydrophobic layer 300 to achieve a superhydrophobic effect similar to that of a lotus leaf.

[0093] In one specific embodiment, the average maximum length L of the plurality of hydrophobic protrusions 310 is 6 μm. In another specific embodiment, the average maximum length L of the plurality of hydrophobic protrusions 310 is 8 μm. In yet another specific embodiment, the average maximum length L of the plurality of hydrophobic protrusions 310 is 7 μm.

[0094] In some embodiments, the thickness d1 of the coating body satisfies the condition: 20μm≤d1≤200μm.

[0095] The thickness h of the coating body can be obtained using 3D modeling equipment such as the Zygo laser interferometer.

[0096] By setting the thickness d1 of the coating body within the range of greater than or equal to 20 μm and less than or equal to 200 μm, the overall thickness of the coating body is reduced. While satisfying the hydrophobic effect, the entire battery device is designed to be lightweight, which is beneficial for cost control.

[0097] In one specific embodiment, the thickness d1 of the coating body is 20 μm. In another specific embodiment, the thickness d1 of the coating body is 200 μm. In yet another specific embodiment, the thickness d1 of the coating body is 100 μm.

[0098] In some embodiments, the thickness d1 of the coating body satisfies the condition: 100μm≤d1≤150μm.

[0099] By setting the thickness d1 of the coating body within the range of greater than or equal to 100μm and less than or equal to 150μm, the overall thickness of the coating body is reduced. While satisfying the hydrophobic effect, the entire battery device is designed to be lightweight, which is beneficial for cost control.

[0100] In one specific embodiment, the thickness d1 of the coating body is 150 μm. In another specific embodiment, the thickness d1 of the coating body is 110 μm. In yet another specific embodiment, the thickness d1 of the coating body is 130 μm.

[0101] Please see Figure 9 In some of these embodiments, Figure 9 It shows Figure 3 This diagram illustrates the contact angle of the surface of the hydrophobic layer 300 in the thermal management assembly. In some embodiments, the contact angle θ of the surface of the hydrophobic layer 300 satisfies the condition: θ ≥ 150°.

[0102] The contact angle θ is the angle at which the edge of a liquid droplet is tangent to the solid surface when the droplet lands on it. It measures the angle between the liquid-solid interface (the surface of the hydrophobic layer 300 facing away from the thermal management component 200) and the gas-liquid interface (the surface of the hydrophobic layer 300 where the water droplet contacts the air).

[0103] Since the contact angle θ of the hydrophobic layer 300 is greater than or equal to 150°, it means that the hydrophobic layer 300 and the droplet retained on its surface form an obtuse angle. The two do not wet each other, and the droplet tends to maintain a spherical shape, making it difficult to spread on the hydrophobic layer 300. As a result, the droplet on the hydrophobic layer 300 is easy to roll off and difficult to retain.

[0104] Please see Figure 5-Figure 7 In some embodiments, the thermal management component 200 includes a plurality of spacers 220 and a plurality of connecting portions 230; the spacers 220 are disposed facing the support plate 100 in a first direction; specifically, the first direction is... Figure 5-Figure 7The yy' direction in the middle; the connecting part 230 is connected between two adjacent spacers 220; the connecting part 230 is fixedly connected to the support plate 100, and any two adjacent connecting parts 230 and the spacer 220 located between the two adjacent connecting parts 230 define and form a fluid channel 210.

[0105] The multiple spacers 220 and multiple connectors 230 on the thermal management component 200 can be formed by bending and stamping on the thermal management component 200. The size and shape of the connectors 230 on the spacers 220 on the thermal management component 200 can be adaptively adjusted according to the shape and size of the fluid channel 210.

[0106] The connecting part 230 and the support plate 100 can be fixedly connected by a welding layer 600.

[0107] By setting the thermal management component 200 to a plurality of spacers 220 and a plurality of connecting parts 230, and defining the fluid channel 210 by any two adjacent connecting parts 230 and the spacers 220 located between the two adjacent connecting parts 230, the formation of the fluid channel 210 is relatively simple and convenient, and easy to process and manufacture.

[0108] Please see Figure 5-Figure 7 In some embodiments, the hydrophobic layer 300 is attached to the surface of the thermal management component 200 on the side opposite to the support plate 100.

[0109] The hydrophobic layer 300 is applied by spraying onto the side of the thermal management component 200 facing away from the support plate 100. This ensures that the entire outer surface of the thermal management component 200, regardless of its irregular shape, is coated with the hydrophobic layer 300 on the side facing away from the support plate 100. In other words, the hydrophobic layer 300 is completely aligned with the thermal management component 200, thus providing good protection for the thermal management component 200.

[0110] Please see Figure 6 In some embodiments, the thermal management component further includes a sacrificial layer 400 disposed between the hydrophobic layer 300 and the thermal management component 200.

[0111] The sacrificial layer 400 can be a Zn sacrificial layer, specifically, it can be an aluminum alloy with a Zn content of 0.8-3%.

[0112] If the hydrophobic layer 300 is damaged or scratched during use, the sacrificial layer 400 will be exposed. Since the sacrificial layer 400 contains active elements such as Zn, due to the characteristics of metallic materials, the electrode potential of the sacrificial layer 400 will be lower than that of ordinary Al alloy. Therefore, when electrochemical corrosion occurs, the sacrificial layer 400 will be preferentially corroded, thereby protecting the thermal management component 200 and improving the corrosion resistance of the thermal management component 200.

[0113] Specifically, when the sacrificial layer 400 is a Zn sacrificial layer, if the hydrophobic layer 300 is damaged or scratched during use, the Zn sacrificial layer will be exposed. Since the Zn sacrificial layer contains Zn, due to the characteristics of metallic materials, the electrode potential of the Al-Zn alloy will be lower than that of ordinary Al alloy. Therefore, when electrochemical corrosion occurs, the Zn sacrificial layer will be preferentially corroded, thereby protecting the thermal management component 200 made of 3003 alloy body, thus improving the corrosion resistance of the thermal management component 200.

[0114] In some embodiments, the thickness d2 of the sacrificial layer 400 satisfies the condition: 50 μm ≤ d2 ≤ 250 μm.

[0115] The design thickness of the sacrificial layer 400 is related to the warranty period of the battery device 1000. In applications such as aerospace or new energy vehicles, where a longer service life is required, a longer warranty period is also needed, thus necessitating a larger thickness for the sacrificial layer 400. Conversely, in applications such as electric toys or power tools, where the service life is shorter, and therefore the warranty period is also shorter, the thickness of the sacrificial layer 400 is set to a smaller value.

[0116] By setting the thickness d2 of the sacrificial layer 400 to a range of greater than or equal to 50 μm and less than or equal to 250 μm, the thickness range of the sacrificial layer 400 is made more suitable and can meet the usage requirements of the battery device 1000 under normal warranty period.

[0117] In one specific embodiment, the thickness d2 of the sacrificial layer 400 is 50 μm. In another specific embodiment, the thickness d2 of the sacrificial layer 400 is 250 μm. In yet another specific embodiment, the thickness d2 of the sacrificial layer 400 is 200 μm.

[0118] Please see Figure 7 In some embodiments, the thermal management component further includes an insulation layer 500 disposed between the hydrophobic layer 300 and the thermal management component 200.

[0119] The insulation layer 500 can be made of polyvinyl chloride foam board (foamed PVC).

[0120] By setting an insulation layer 500 between the hydrophobic layer 300 and the thermal management component 200, the hydrophobic layer 300 is insulated and isolated, reducing the temperature difference between the two sides of the hydrophobic layer 300, thereby reducing the formation of condensate on the hydrophobic layer 300 in low-temperature operating environments.

[0121] In some embodiments, the thickness d3 of the insulation layer 500 satisfies the condition: 0.8mm≤d3≤2mm.

[0122] The thickness of the insulation layer 500 is adaptively adjusted according to the capacity of the battery cells 1200 that the battery device 1000 needs to cool. When the capacity of the battery cells 1200 that need to be cooled is large, and it is a high-power battery device 1000, more heat will be generated during charging and discharging, thus requiring a thicker insulation layer 500 for heat insulation. Conversely, when the capacity of the battery cells 1200 that need to be cooled is small, and it is a low-power battery device 1000, less heat will be generated during charging and discharging, thus requiring only a thinner insulation layer 500 for heat insulation.

[0123] This application sets the thickness d3 of the insulation layer 500 to a range greater than or equal to 0.8 mm and less than or equal to 2 mm, thereby making the thickness range of the insulation layer 500 more suitable and able to meet the usage requirements of the battery device 1000 during the normal warranty period.

[0124] In one specific embodiment, the thickness d3 of the insulation layer 500 is 0.8 mm. In another specific embodiment, the thickness d3 of the insulation layer 500 is 2 mm. In yet another specific embodiment, the thickness d3 of the insulation layer 500 is 1.5 mm.

[0125] In some embodiments, the first surface 110 is provided with an insulating layer.

[0126] The insulating layer can be sprayed onto the first surface 110 of the support plate 100 using a spraying process. The insulating layer can be a powder-coated insulating layer, thereby improving the wear resistance, corrosion resistance, and aesthetics of the first surface 110. The insulating layer can be made of spraying materials such as epoxy resin, polyurethane resin, or acrylic resin.

[0127] By providing an insulating layer on the first surface 110, the possibility of corrosion damage to the first surface 110 is reduced. Furthermore, due to the improved wear resistance, it is easier to mount the battery cell 1200 on its surface, and the entire battery device 1000 is also more aesthetically pleasing.

[0128] The battery device 1000 provided in this application embodiment includes a housing 1100, a battery cell 1200, and a thermal management component. The housing 1100 is configured with a receiving space 1110, in which the battery cell 1200 is housed. The thermal management component is connected to the housing 1100 and includes a support plate 100, a thermal management component 200, a sacrificial layer 400, an insulation layer 500, and a hydrophobic layer 300. The support plate 100 has a first surface 110 and a second surface 120 disposed opposite each other along a first direction; a thermal management component 200 is disposed on one side of the second surface 120 of the support plate 100 along the first direction and is fixedly connected to the support plate 100; the thermal management component 200 includes a plurality of spacers 220 and a plurality of connecting portions 230; the spacers 220 are disposed facing the support plate 100 in the first direction, and the connecting portions 230 are connected between two adjacent spacers 220; the connecting portions 230 are fixedly connected to the support plate 100, and any two adjacent connecting portions 230 and the spacers 220 located between the two adjacent connecting portions 230 define a fluid channel 210. A hydrophobic layer 300 completely covers the surface of the thermal management component 200 facing away from the support plate 100; and the hydrophobic layer 300 is in contact with the surface of the thermal management component 200 facing away from the support plate 100. The hydrophobic layer 300 includes a coating body and a plurality of hydrophobic protrusions 310, which are spaced apart from each other on the side of the coating body away from the thermal management component 200. The sacrificial layer 400 is disposed between the hydrophobic layer 300 and the thermal management component 200. The thermal insulation layer 500 is also disposed between the hydrophobic layer 300 and the thermal management component 200.

[0129] When the battery device 1000 provided in this embodiment is installed on an electrical device, it is used to cool the battery cells 1200 in the battery device 1000 during use. At this time, the first surface 110 is the side closest to the battery cell 1200, while the hydrophobic layer 300 is in contact with the external environment. In colder winters, because the hydrophobic layer 300 completely covers the thermal management component 200 and its orientation is perfectly aligned with the thermal management component 200, the protection effect on the thermal management component 200 is good. Therefore, the entire thermal management component 200 can be protected by the hydrophobic layer 300. When the hydrophobic layer 300 comes into contact with water from the external environment, it is difficult for the water to freeze at the hydrophobic layer 300, thereby reducing the possibility of water seepage damage to the entire thermal management component 200, reducing the risk of cooling medium leakage, and ensuring that the battery cell 1200 receives sufficient cooling and heat dissipation during subsequent use, making the use process safer. Furthermore, it reduces the corrosion resistance requirements of the thermal management component 200, thereby effectively reducing the manufacturing difficulty and cost of the thermal management component 200. In addition, since this application uses the hydrophobic layer 300 as a coating body and hydrophobic protrusions 310 protruding from the coating body, the multiple hydrophobic protrusions 310 spaced apart divide the entire hydrophobic layer 300 into different blocks, further reducing the possibility of water freezing in small pieces on the hydrophobic layer 300 and merging into large sheets, resulting in better hydrophobic properties of the hydrophobic layer 300. Simultaneously, the thermal management component 200 is configured with multiple spacers 220 and multiple connecting parts 230, and a fluid channel 210 is formed by defining any two adjacent connecting parts 230 and the spacers 220 located between these two adjacent connecting parts 230, making the formation of the fluid channel 210 simpler, more convenient, and easier to process and manufacture. Furthermore, when the hydrophobic layer 300 is damaged or scratched during use, the sacrificial layer 400, which is located between the thermal management component 200 and the hydrophobic layer 300, will be exposed. Because the sacrificial layer 400 contains active elements, and due to the characteristics of metallic materials, the electrode potential of the sacrificial layer 400 will be lower than that of ordinary Al alloys. Therefore, during electrochemical corrosion, the sacrificial layer 400 will corrode preferentially, thereby protecting the thermal management component 200 and improving its corrosion resistance. Simultaneously, the insulation layer 500, located between the hydrophobic layer 300 and the thermal management component 200, provides thermal insulation and isolation for the hydrophobic layer 300, reducing the temperature difference across the hydrophobic layer 300. This, in lower-temperature operating environments, reduces the formation of condensate on the hydrophobic layer 300.

[0130] This application also provides a thermal management assembly, which includes a support plate 100, a thermal management component 200, and a hydrophobic layer 300. The support plate 100 has a first surface 110 and a second surface 120 disposed opposite to each other along a first direction; specifically, the first direction is... Figures 4-7The thermal management component 200 is disposed on one side of the second surface 120 of the support plate 100 along the first direction and is fixedly connected to the support plate 100; a fluid channel 210 for accommodating the cooling medium is constructed between the thermal management component 200 and the support plate 100; the hydrophobic layer 300 completely covers the side surface of the thermal management component 200 away from the support plate 100.

[0131] The thermal management component provided in this embodiment is installed on the battery device 1000 to cool the battery cells 1200 in the battery device 1000 during use. At this time, the first surface 110 is the side closest to the battery cell 1200, while the hydrophobic layer 300 is in contact with the external environment. In colder winters, because the hydrophobic layer 300 completely covers the thermal management component 200, the entire thermal management component 200 is protected by the hydrophobic layer 300. When the hydrophobic layer 300 comes into contact with water from the external environment, water is unlikely to freeze at the hydrophobic layer 300, thereby reducing the possibility of water seepage damage to the entire thermal management component 200, reducing the risk of cooling medium leakage, and ensuring that the battery cell 1200 receives sufficient cooling and heat dissipation during subsequent use, making the use safer. Furthermore, it reduces the corrosion resistance requirements of the thermal management component 200, thereby effectively reducing the manufacturing difficulty and cost of the thermal management component 200.

[0132] This application also provides an electrical device, which includes a battery device 1000 and the battery device 1000 described in any of the above embodiments. The first surface 110 of the battery device 1000 is used to support the battery device 1000. In use, the hydrophobic layer 300 of the battery device 1000 is in contact with the external environment. In colder winters, because the hydrophobic layer 300 completely covers the thermal management component 200, the entire thermal management component 200 is protected by the hydrophobic layer 300. When the hydrophobic layer 300 comes into contact with water from the external environment, it is difficult for the water to freeze at the hydrophobic layer 300, thereby reducing the possibility of water seepage damage to the entire thermal management component, reducing the risk of cooling medium leakage, and ensuring that the battery cell 1200 can receive sufficient cooling and heat dissipation during subsequent use, making the use safer. Furthermore, it reduces the corrosion resistance requirements of the thermal management component 200, thereby effectively reducing the manufacturing difficulty and cost of the thermal management component 200, resulting in a lower overall cost.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, The battery device includes: The box (1100) has a storage space (1110). A battery cell (1200) is housed within the receiving space (1110); and A thermal management component, connected to the housing (1100), the thermal management component comprising: The support plate (100) has a first surface (110) and a second surface (120) disposed opposite to each other along a first direction. A thermal management component (200) is disposed along a first direction on one side of the second surface (120) of the support plate (100) and is fixedly connected to the support plate (100); a fluid channel (210) for accommodating a cooling medium is formed between the thermal management component (200) and the support plate (100); and A hydrophobic layer (300) completely covers the side surface of the thermal management component (200) facing away from the support plate (100).

2. The battery device according to claim 1, characterized in that, The hydrophobic layer (300) includes: The coating body; and Multiple hydrophobic protrusions (310) are provided at intervals on the side of the coating body away from the thermal management component (200).

3. The battery device according to claim 2, characterized in that, The average height h of the plurality of hydrophobic protrusions (310) along the first direction satisfies the condition: 10μm≤h≤20μm; The first direction is where the top of the hydrophobic protrusion (310) points to the side of the coating body away from the thermal management component (200).

4. The battery device according to claim 3, characterized in that, The average maximum length L of the plurality of hydrophobic protrusions (310) along the second direction satisfies the following condition: 6μm≤L≤8μm; The second direction is perpendicular to the first direction.

5. The battery device according to claim 2, characterized in that, The thickness d1 of the coating body satisfies the following condition: 20μm≤d1≤200μm.

6. The battery device according to claim 5, characterized in that, The thickness d1 of the coating body satisfies the following condition: 100μm≤d1≤150μm.

7. The battery device according to claim 1, characterized in that, The contact angle θ of the surface of the hydrophobic layer (300) satisfies the following condition: θ≥150°.

8. The battery device according to claim 1, characterized in that, The thermal management component (200) includes a plurality of spacers (220) and a plurality of connecting parts (230). The spacer (220) is disposed facing the support plate (100) in a first direction, and the connecting part (230) connects two adjacent spacers (220); The connecting portion (230) is fixedly connected to the support plate (100), and any two adjacent connecting portions (230) and the spacer portion (220) located between the two adjacent connecting portions (230) define and form the fluid channel (210).

9. The battery device according to claim 8, characterized in that, The hydrophobic layer (300) is attached to the surface of the thermal management component (200) on the side opposite to the support plate (100).

10. The battery device according to any one of claims 1-9, characterized in that, The thermal management component also includes a sacrificial layer (400); The sacrificial layer (400) is disposed between the hydrophobic layer (300) and the thermal management component (200).

11. The battery device according to claim 10, characterized in that, The thickness d2 of the sacrificial layer (400) satisfies the following condition: 50μm≤d2≤250μm.

12. The battery device according to any one of claims 1-9, characterized in that, The thermal management component also includes an insulation layer (500); The insulation layer (500) is disposed between the hydrophobic layer (300) and the thermal management component (200).

13. The battery device according to claim 12, characterized in that, The thickness d3 of the insulation layer (500) meets the following condition: 0.8mm≤d3≤2mm.

14. The battery device according to any one of claims 1-9, characterized in that, The first surface (110) is provided with an insulating layer.

15. A thermal management component, characterized in that, include: The support plate (100) has a first surface (110) and a second surface (120) disposed opposite to each other along a first direction. as well as A thermal management component (200) is disposed along a first direction on one side of the second surface (120) of the support plate (100) and is fixedly connected to the support plate (100); a fluid channel (210) for accommodating a cooling medium is formed between the thermal management component (200) and the support plate (100); and A hydrophobic layer (300) completely covers the side surface of the thermal management component (200) facing away from the support plate (100).

16. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1-14, wherein the battery device is used to provide electrical energy to the electrical device.

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