Battery device and electric appliance

Abstract

The application provides a battery device and an electric device. The battery device comprises: a battery assembly comprising a plurality of battery monomers; the battery assembly has a first central region and a first edge region surrounding the first central region; a heat exchange element, the battery assembly is arranged on the heat exchange element; a uniform temperature assembly comprising a plurality of uniform temperature elements, the uniform temperature elements are in contact with at least two battery monomers; a first end of the uniform temperature element extends to the first central region, and a second end of the uniform temperature element extends to the first edge region; the uniform temperature element comprises a shell, a liquid absorption core, a phase change working medium and a corrosion-resistant functional layer, the shell has a phase change channel; the liquid absorption core and the phase change working medium are arranged in the phase change channel; the corrosion-resistant functional layer comprises a first corrosion-resistant functional layer, and the first corrosion-resistant functional layer is arranged on the outer wall surface of the liquid absorption core; the first corrosion-resistant functional layer comprises a surface structure layer formed after the outer wall surface of the liquid absorption core is subjected to hydrophobic and / or hydrophilic treatment. The battery device improves the uniform temperature; and the risk of failure of the uniform temperature element can be reduced, and the service life of the uniform temperature element is prolonged.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery device and electrical equipment. Background Technology

[0002] With the rapid development of new energy vehicles, their market share is increasing, and the market's requirements for the performance of battery devices in new energy vehicles are also getting higher and higher.

[0003] A battery device consists of multiple battery cells. During the charging and discharging process, the temperature difference between the multiple battery cells can be large due to factors such as their different positions, resulting in poor overall temperature uniformity of the battery device and thus reducing the overall performance of the battery device. Moreover, existing temperature equalization components for battery devices are prone to failure and have a short lifespan. Summary of the Invention

[0004] The battery device and electrical equipment provided in this application aim to solve the problems of poor overall temperature uniformity of existing battery devices, and the easy failure and short lifespan of temperature equalization components.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is to provide a battery device, which includes:

[0006] A battery module includes multiple battery cells; the battery module has a first central region and a first edge region surrounding the first central region;

[0007] The heat exchanger is mounted on the battery assembly.

[0008] A temperature equalization assembly includes multiple temperature equalization elements, each in contact with at least two battery cells. Each temperature equalization element has a first end and a second end, with the first end extending to a first central region and the second end extending to a first edge region. The temperature equalization element includes a housing, a liquid absorbent core, a phase change working medium, and an anti-corrosion functional layer. The housing has a phase change channel. The liquid absorbent core and the phase change working medium are disposed within the phase change channel. The anti-corrosion functional layer includes a first anti-corrosion functional layer disposed on the outer wall surface of the liquid absorbent core. The first anti-corrosion functional layer includes a surface structure layer formed on the outer wall surface of the liquid absorbent core after hydrophobic and / or hydrophilic treatment.

[0009] The above-described scheme, by setting up a temperature equalization component, with its temperature equalization element in contact with at least two battery cells, facilitates heat transfer between the temperature equalization component and the battery cells. Simultaneously, by extending the first end of each temperature equalization element to the first central region and the second end to the first edge region, the temperature between the first central region and the first edge region of the battery device can be evenly balanced, thereby improving the thermal management performance and temperature uniformity of the battery device. Furthermore, by providing a first anti-corrosion functional layer on the outer wall surface of the liquid-absorbing core of the temperature equalization component, the surface of the liquid-absorbing core can be protected, effectively reducing the risk of chemical reaction between the surface of the liquid-absorbing core and the phase change working fluid, leading to temperature equalization component failure and extending its service life. Moreover, using a surface structure layer formed by hydrophobic and / or hydrophilic treatment of the outer wall surface of the liquid-absorbing core as an anti-corrosion functional layer has less impact on the liquid absorption effect of the liquid-absorbing core compared to directly coating the surface of the liquid-absorbing core, effectively ensuring the liquid-conducting effect of the liquid-absorbing core on the liquid phase change working fluid.

[0010] In one embodiment, the anti-corrosion functional layer includes a second anti-corrosion functional layer disposed on the inner wall surface of the housing; the second anti-corrosion functional layer includes a coating disposed on the inner wall surface of the housing; and / or the second anti-corrosion functional layer includes a passivation layer formed by surface treatment of the inner wall surface of the housing.

[0011] The above-mentioned solution protects the inner wall of the shell through a second anti-corrosion functional layer, reducing the risk of chemical reaction between the inner wall and the phase change working medium. Furthermore, the coating protects the shell and can be applied to shells of various materials, with the coating's properties (wear resistance, corrosion resistance, insulation, etc.) selectable according to requirements. The coating thickness can also be flexibly adjusted from nanometer to millimeter levels. By surface-treating the inner wall of the shell to form a passivation layer, the shell is protected. The passivation layer has strong adhesion to the shell, is not easily peeled off, and has a long service life. Moreover, this solution has minimal impact on the volume of the phase change channel, effectively ensuring the temperature uniformity of the homogenizer.

[0012] In one embodiment, the shell is made of the same or similar material as the absorbent core. This significantly reduces the likelihood of a chemical reaction between the shell and the absorbent core; moreover, using the same material ensures greater stability of the overall structure under high temperature and high humidity conditions, thereby extending the service life of the temperature equalization component. Furthermore, using the same or similar materials simplifies welding, bonding, or other joining processes, simplifying the manufacturing process; and processing parameters (such as welding temperature and pressure) for the same material are easier to control, helping to reduce production costs and improve yield. Additionally, a less corrosive phase change medium can be selected based on the materials used for the shell and the absorbent core, reducing the risk that one of the phase change mediums is more corrosive to the shell or the absorbent core than to the other.

[0013] In one embodiment, under acidic conditions, the phase change working fluid includes acetone; the shell material includes Hastelloy; and the wicking material includes sintered nickel powder. This allows the isotherm to exhibit good corrosion resistance even under acidic conditions, reducing the risk of isotherm failure and extending its service life.

[0014] In one embodiment, the heat exchanger has a second central region and a second edge region surrounding the second central region; the second central region is a region radiating outward with the center of the heat exchanger as the center and a predetermined length as the radius; the phase change channel includes a main channel and multiple branch channels, one end of the main channel serves as the first end of the heat equalizer, and the first end of the heat equalizer extends to the second central region; one end of each of the multiple branch channels is connected to the main channel, and the other end of each of the multiple branch channels extends to the second edge region and serves as a second end of the heat equalizer.

[0015] The above solution can quickly absorb the heat of the battery cells in the first central region through the first end of the main channel. This heat is then transferred to multiple different edge locations through multiple branch channels, thereby achieving temperature uniformity of the battery cells in the first central region and multiple different edge locations, improving the temperature uniformity of the battery module and the overall performance of the battery device.

[0016] In one embodiment, the heat exchanger includes at least one heat exchange channel, which includes multiple branch channels; there is at least one branch channel between two adjacent branch channels. Thus, having at least one branch channel between two heat exchange channels allows for improved heat exchange efficiency and temperature equalization efficiency for individual battery cells through the rational arrangement of the temperature equalization components and the heat exchanger.

[0017] In one embodiment, the heat exchanger is divided into two heat exchange regions along a first direction; each heat exchange region includes at least one heat exchange channel, each branch channel of the heat exchange channel extends along the first direction and is spaced apart along a second direction intersecting the first direction; the branch channel located between two adjacent branch channels extends along the first direction to a second edge region of the heat exchanger.

[0018] The above-described scheme, by arranging two heat exchange zones spaced apart along the first direction, can simultaneously perform heat exchange and temperature equalization for a larger number of battery cells, reducing the temperature difference between multiple battery cells and improving the overall performance of the battery device. Furthermore, the heat exchange efficiency and temperature equalization efficiency for the battery cells can be further improved by rationally arranging the branch channels and branch flow paths. Moreover, extending the branch channels and flow paths along the first direction reduces the risk of mutual interference between them and shortens the extension path of the branch channels, thereby further improving the temperature equalization efficiency.

[0019] In one embodiment, the bottom wall of the phase change channel is provided with microgrooves, the liquid wick covers the microgrooves, and at least a portion of the microgrooves extends along a first direction; wherein at least two battery cells are arranged in the first direction, and each channel contacts at least two battery cells arranged along the first direction.

[0020] The above scheme enables the liquid phase change working medium that is not absorbed by the wick to flow through the microgroove along the first direction, making it easier for the liquid phase change working medium to act on the battery cells arranged along the first direction, further improving the temperature equalization efficiency of the battery cells, reducing the temperature difference between multiple battery cells, and improving the overall performance of the battery device.

[0021] In one embodiment, the temperature equalization element further includes a bundle-shaped strip disposed within the phase change channel and sandwiched between the liquid-absorbing core and the top wall of the housing. The bundle-shaped strip, sandwiched between the liquid-absorbing core and the top wall of the temperature equalization element, can limit excessive deformation of the liquid-absorbing core to block at least the redundant space.

[0022] In one embodiment, the portion of the phase change channel not filled with the wick serves as redundant space. The wick is fitted against the inner wall of the housing, enclosing the redundant space, within which the phase change working fluid resides. This further reduces the risk of the phase change working fluid coming into contact with the housing, leading to a chemical reaction and potential failure of the temperature equalization element.

[0023] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide an electrical device that includes the battery device mentioned above.

[0024] 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

[0025] 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:

[0026] Figure 1 This is a schematic diagram of the structure of an electrical device provided in an embodiment of this application;

[0027] Figure 2 This is a disassembly diagram of a battery device provided in some embodiments of this application;

[0028] Figure 3A plan view of a temperature equalization element provided in an embodiment of this application;

[0029] Figure 4 Provided for an embodiment of this application Figure 3 A schematic diagram of a cross-section of the temperature equalizer along the AA direction is shown.

[0030] Figure 5 Provided for another embodiment of this application Figure 3 A schematic diagram of a cross-section of the temperature equalizer along the AA direction is shown.

[0031] Figure 6 Provided for yet another embodiment of this application Figure 3 A schematic diagram of a cross-section of the temperature equalizer along the AA direction is shown.

[0032] Figure 7 A schematic diagram showing the distribution of the temperature equalization element on the heat exchanger according to an embodiment of this application;

[0033] Figure 8 Provided for an embodiment of this application Figure 7 A schematic diagram of a cross-section of the structure shown along the BB direction;

[0034] Figure 9 Provided for another embodiment of this application Figure 7 A schematic diagram of a cross-section of the structure shown along the BB direction;

[0035] Figure 10 Provided for yet another embodiment of this application Figure 7 The diagram shows a cross-sectional view of the structure along the BB direction.

[0036] Explanation of reference numerals in the attached figures

[0037] 100 Electrical components; 200 Battery device; 10 Battery assembly; 11 Battery cell; 20 Heat exchanger; aa Second central area; 211 Main inlet channel; 212 Branch channel; 213 Main outlet channel; bb Heat exchange area; 22 Fluid inlet; 23 Fluid outlet; 24 Lower heat exchange plate; 25 Upper heat exchange plate; 31 Temperature equalization element; 310 Phase change channel; 3101 Main channel; 3102 Branch channel; 311 Shell; 312 Liquid suction core; 313 Phase change working fluid; 314 Anti-corrosion functional layer; 3141 Second anti-corrosion functional layer; 3142 First anti-corrosion functional layer; 315 Microgroove; 316 Bundle-shaped strip; 317 Redundancy space; 40 Battery housing; 41 Frame structure; 42 Top cover. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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).

[0044] 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.

[0045] 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.

[0046] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0047] A battery device comprises multiple individual cells. During charging and discharging, significant temperature differences can occur between these cells due to factors such as their different positions, resulting in poor overall temperature uniformity and consequently reducing the overall performance of the battery device. To address this, related technologies typically incorporate temperature equalization devices to homogenize the battery. However, the performance of these devices is limited by the compatibility of the phase change medium (PCM) with the casing and wicking core. If the PCM undergoes a chemical reaction (such as corrosion or gas generation), the temperature equalization device may fail, affecting its lifespan. Furthermore, related technologies often rely on limited material combinations for the PCM and the casing / wicking core, failing to systematically address the compatibility issues of the PCM with the casing / wicking core under high-temperature, low-temperature, or corrosive environments.

[0048] Based on this, the present application provides a battery device that can not only perform temperature equalization treatment on the battery device, but also reduce the risk of temperature equalization component failing due to chemical reaction between the temperature equalization component and the casing and / or liquid absorbent core, thereby improving the service life of the temperature equalization component.

[0049] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] Please see Figure 1 , Figure 1 A schematic diagram of the electrical equipment provided in this application.

[0051] In one embodiment, an electrical device is provided, comprising an electrical component 100 and a battery device 200, the battery device 200 being electrically connected to the electrical component 100. The battery device 200 is used to provide electrical energy to the electrical device, enabling the electrical component 100 to operate.

[0052] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0053] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0054] The power-consuming device 100 can be an electrical component or device; the power-consuming device 100 can be a controller and electronic components, etc., and the controller can be a central processing unit (CPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0055] In some examples, the electrical equipment can be a vehicle, and the electrical component 100 can be the vehicle's lights (e.g., headlights, taillights, etc.), display screen, dashboard, control system (e.g., controller), etc. The vehicle may also include a frame, with both the battery device 200 and the electrical component 100 mounted on the vehicle body.

[0056] Please see Figures 2 to 4 , Figure 2 This is a disassembly diagram of the battery device 200 provided in some embodiments of this application; Figure 3 A plan view of a temperature equalization element 31 provided in an embodiment of this application; Figure 4 Provided for an embodiment of this application Figure 3 The diagram shows a cross-sectional view of the temperature equalizer 31 along the AA direction.

[0057] In one embodiment, a battery device 200 is provided, the battery device 200 including a battery assembly 10, a heat exchanger 20, and a temperature equalization assembly. The battery assembly 10 includes a plurality of battery cells 11; the battery assembly 10 has a first central region and a first edge region surrounding the first central region; the battery assembly 10 is disposed on the heat exchanger 20. The temperature equalization assembly includes multiple temperature equalization elements 31, each of which is in contact with at least two battery cells 11. Each temperature equalization element 31 has a first end and a second end, with the first end extending to a first central region and the second end extending to a first edge region. Each temperature equalization element 31 includes a housing 311, a liquid absorbent core 312, a phase change working medium 313, and an anti-corrosion functional layer 314. The housing 311 has a phase change channel 310. The liquid absorbent core 312 and the phase change working medium 313 are disposed within the phase change channel 310. The anti-corrosion functional layer 314 includes a first anti-corrosion functional layer 3142, which is disposed on the outer wall surface of the liquid absorbent core 312. The first anti-corrosion functional layer 3142 includes a surface structure layer formed by hydrophobic and / or hydrophilic treatment of the outer wall surface of the liquid absorbent core 312.

[0058] The first central region can be a region radiating outward from the center of the battery assembly 10 with a preset length as the radius.

[0059] As an example, the battery assembly 10 has a temperature-equalizing contact surface configured to contact a temperature-equalizing component. Specifically, the first central region and the first edge region of the battery assembly 10 refer to the first central region and the first edge region of the temperature-equalizing contact surface. The first central region can be a circular region or a polygonal region; the straight-line distance (i.e., the radius mentioned above) between each side of the polygonal region and the center of the first central region is the same. The polygonal region can be a square region, a triangular region, or a hexagonal region, etc.

[0060] For example, the area of ​​the first central region is less than or equal to the sum of the areas of the bottom or top surfaces of the four battery cells 11. As an example, the area of ​​the first central region may be the same as the sum of the areas of the bottom or top surfaces of one, two, three, or four battery cells 11.

[0061] For example, the ratio of the area of ​​the first central region to the area of ​​the entire temperature-equalizing contact surface of the battery assembly 10 is greater than or equal to 0.1 and less than or equal to 0.15. For example, the ratio may be 0.1, 0.11, 0.12, 0.13, 0.14 or 0.15.

[0062] Multiple battery cells 11 can be connected in series, parallel, or mixed to form a battery module 10. In other embodiments, multiple battery cells 11 can also be connected in series, parallel, or mixed first, and then arranged in a fixed manner to form a battery module 10. In still other embodiments, multiple battery cells 11 can also be connected in series, parallel, or mixed first, and then arranged in a fixed manner to form multiple modules, which are then connected in series, parallel, or mixed to form a whole.

[0063] As an example, multiple battery cells 11 can be fixed together to form a battery assembly 10 using cable ties or the like. As another example, multiple battery cells 11 can also be fixed together to form a battery assembly 10 using end plates, side plates, or the like.

[0064] The battery cell 11 involved in this application refers to the smallest unit for storing and outputting electrical energy. The battery cell 11 can be a secondary battery or a primary battery. The battery cell 11 can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 11 can be cylindrical, flat, cuboid, or other shapes.

[0065] The battery cell 11 may include a casing, electrode assemblies, and other functional components. The casing includes an end cap and a bottom shell. The end cap is a component that closes onto the opening of the bottom shell to isolate the internal environment of the battery cell 11 from the external environment. In any case, the shape of the end cap may be adapted to the shape of the bottom shell. Optionally, the end cap may be made of a material with a certain degree of hardness and strength (such as aluminum alloy), so that the end cap is less prone to deformation under pressure and impact, giving the battery cell 11 higher structural strength and improved safety performance.

[0066] The end cap may be provided with functional components such as electrode terminals. The electrode terminals can be used for electrical connection with the electrode assembly to output or input electrical energy to the battery cell 11. In some embodiments, the electrode terminals may include terminals. Terminals may include positive and negative terminals for current output and connection to external circuits. In some embodiments, the end cap may also be provided with an explosion-proof component for releasing internal pressure when the internal pressure or temperature of the battery cell 11 reaches a threshold. The end cap can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating component may be provided on the inner side of the end cap to isolate the electrical connection components within the bottom shell from the end cap, reducing the risk of short circuits. For example, the insulating component may be plastic, rubber, etc. The bottom shell is an assembly used to cooperate with the end cap to form the internal environment of the battery cell 11, wherein the formed internal environment can accommodate the electrode assembly, electrolyte, and other components. The bottom shell and end cap can be independent components. An opening can be provided on the bottom shell, and the end cap closes the opening to form the internal environment of the battery cell 11. Alternatively, the end cap and bottom shell can be integrated. Specifically, the end cap and bottom shell can form a common connection surface before other components are installed. When it is necessary to encapsulate the interior of the bottom shell, the end cap closes the bottom shell. The bottom shell can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the bottom shell can be determined according to the specific shape and size of the electrode assembly. The bottom shell can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The electrode assembly is the component in the battery cell 11 where the electrochemical reaction occurs. The bottom shell can contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking positive and negative electrode plates, and usually a separator is provided between the positive and negative electrode plates. The portions of the positive and negative electrodes containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrodes without active material each constitute a tab. The positive and negative tabs can be located together at one end of the main body or separately at both ends. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0067] In some embodiments, the battery device 200 further includes a battery housing 40, which has a receiving groove in which the battery assembly 10 is disposed. Figure 2As shown, the battery housing 40 may include a frame structure 41 and a top cover 42. The frame structure 41 may be arranged in a ring shape, and the top cover 42 may cover an opening in the frame structure 41 to form a receiving groove in the battery housing 40, in which the battery assembly 10 is disposed. In some embodiments, the battery housing 40 may further include a bottom protective plate, which may be located on the side of the battery assembly 10 away from the top cover 42. The bottom protective plate is fixedly connected to the frame structure 41, thereby providing better protection for the temperature-equalizing assembly.

[0068] Each temperature equalization element 31 is independent of the others, thus allowing for more flexible arrangement of the temperature equalization elements 31, and resulting in better temperature equalization and sealing performance.

[0069] The temperature equalization element 31 has a first end and a second end. The end of the temperature equalization element 31 corresponding to the battery cell 11 with a higher temperature is defined as the high-temperature end, and the end of the temperature equalization element 31 corresponding to the battery cell 11 with a lower temperature is defined as the low-temperature end. In this embodiment, the first end of the temperature equalization element 31 is the high-temperature end, and the second end is the low-temperature end.

[0070] At least two battery cells 11 are in contact with different positions on the temperature equalization element 31. These two cells can exchange heat with the temperature equalization element 31. For example, the projections of the two battery cells 11 onto the temperature equalization element 31 at least partially overlap with the projection of the liquid absorber 312 onto the temperature equalization element 31. When a significant temperature difference exists between the two battery cells 11, the liquid phase change working fluid 313 within the temperature equalization element 31 can vaporize due to the temperature influence of the hotter battery cell 11. The vaporized phase change working fluid 313 can then... Within the phase change channel 310, the gaseous phase change working medium 313 moves to the location of the battery cell 11 with a lower temperature. The gaseous phase change working medium 313 in the temperature equalization element 31 can be liquefied by the temperature of the battery cell 11 with a lower temperature. The liquefied phase change working medium 313 can wet the liquid absorber 312 and diffuse to the location of the battery cell 11 with a higher temperature under the action of the liquid absorber 312. The gaseous phase change working medium 313 and the liquid phase change working medium 313 circulate within the phase change channel 310, realizing heat conduction of the battery cell 11 and reducing the temperature difference between battery cells 11 with different temperatures.

[0071] The shell 311 may have a hollow structure, and a phase change channel 310 is formed inside the shell 311. The phase change channel 310 is a sealed space. The shell 311 may be made of aluminum, copper, stainless steel, titanium alloy, nickel-based alloy or Hastelloy.

[0072] The phase change working medium 313 may include, but is not limited to, water, ammonia, acetone, and liquid metal (such as sodium-potassium alloy). The phase change working medium 313 may be in either liquid or gaseous state. The gaseous phase change working medium 313 can be liquefied at low temperatures, and the liquid phase change working medium 313 can be vaporized at high temperatures.

[0073] The wick 312 may have specific porosity and permeability. The wick 312 can absorb the liquid phase change working medium 313, which can permeate through the wick 312 and flow back to the high-temperature end of the temperature equalizer 31. The wick 312 can be fixed within the phase change channel 310 by welding, bonding, or other methods. Materials for the wick 312 include sintered copper powder, stainless steel wire mesh, and titanium fiber.

[0074] In one example, combined Figure 4 The entire outer wall surface of the absorbent core 312 is provided with a first anti-corrosion functional layer 3142. In another example, a portion of the outer wall surface of the absorbent core 312 is provided with the first anti-corrosion functional layer 3142, while the remaining outer wall surfaces are not provided with the first anti-corrosion functional layer 3142. For example, the outer wall surface of the absorbent core 312 that contacts the housing 311 may not be provided with the first anti-corrosion functional layer 3142, while the other outer wall surfaces are all provided with the first anti-corrosion functional layer 3142.

[0075] As an example, the first anti-corrosion functional layer 3142 includes a surface structure layer formed by hydrophobic treatment of the outer wall surface of the absorbent core 312. Hydrophobic treatment is a technique that alters the surface properties of a material to give it the ability to repel water molecules. This technique is widely used in waterproofing, antifouling, and anti-corrosion applications. Hydrophobic treatment methods include coating, micro / nanostructure fabrication, and chemical modification. Coating involves applying a low surface energy material (such as fluorides or siloxanes) to the surface of the absorbent core 312 to form a superhydrophobic coating. Micro / nanostructure fabrication mimics superhydrophobic phenomena in nature (such as the lotus effect) by constructing a rough structure on the surface of the absorbent core 312 using micro / nano processing technology, combining it with low surface energy materials to form a superhydrophobic surface. Chemical modification introduces low surface energy functional groups into the molecular chains of the absorbent core 312 surface through chemical reactions, thereby endowing the absorbent core 312 with hydrophobicity.

[0076] As an example, the first anti-corrosion functional layer 3142 includes a surface structure layer formed by hydrophilic treatment of the outer wall surface of the absorbent core 312. Hydrophilic treatment is a technique that alters the surface properties of a material to make it more susceptible to adsorption of water molecules. This technique can effectively reduce the adsorption of corrosive media (such as oxygen, chloride ions, etc.) on the material surface, thereby improving anti-corrosion performance. Hydrophilic treatment methods include coating, surface oxidation, and hydroxylation modification. Coating involves applying a layer of hydrophilic material with high surface energy (such as hydroxylated siloxanes, polyethylene glycol, etc.) to the surface of the absorbent core 312 to form a hydrophilic coating. Surface oxidation involves generating a dense oxide film on the absorbent core 312 through chemical or electrochemical methods. This oxide film possesses hydrophilicity and good anti-corrosion properties. Examples include anodic oxidation or chemical passivation. Hydroxylation modification involves introducing hydroxyl groups (-OH) into the surface molecular chains of the absorbent core 312 through a chemical reaction, imparting hydrophilicity. Examples include acid-base treatment or plasma treatment.

[0077] Of course, in other embodiments, the first anti-corrosion functional layer 3142 may also be a coating structure disposed on the surface of the liquid-absorbing core 312.

[0078] In this embodiment, by contacting the temperature equalization element 31 with at least two battery cells 11, heat transfer between the temperature equalization element 31 and the battery cells 11 is facilitated. Furthermore, by extending a first end of each temperature equalization element 31 to a first central region and a second end to a first edge region, the temperature equalization assembly can balance the temperature between the first central region and the first edge region of the battery device 200, thereby improving the overall thermal management performance and temperature uniformity of the battery device 200. Additionally, by providing a first anti-corrosion functional layer 3142 on the outer wall surface of the liquid-absorbing core 312 of the temperature equalization element 31, the surface of the liquid-absorbing core 312 can be protected, effectively reducing the risk of chemical reaction between the surface of the liquid-absorbing core 312 and the phase change working fluid 313, which could lead to failure of the temperature equalization element 31, and extending the service life of the temperature equalization element 31. Furthermore, the surface structure layer formed by treating the outer wall of the liquid absorber 312 with hydrophobic and / or hydrophilic agents serves as the anti-corrosion functional layer 314 to protect the liquid absorber 312. Compared with the scheme of directly coating the protective layer on the surface of the liquid absorber 312, this has less impact on the liquid absorption effect of the liquid absorber 312 and can effectively ensure the liquid conduction effect of the liquid absorber 312 on the liquid phase change working medium 313.

[0079] The temperature balance between the first central region and the first edge region of the battery device 200 means that the temperature difference between the first central region and the first edge region of the battery device 200 is no greater than 5°.

[0080] See Figure 5 , Figure 5Provided for another embodiment of this application Figure 3 The diagram shows a cross-sectional view of the temperature equalizer 31 along the AA direction.

[0081] In one embodiment, the anti-corrosion functional layer 314 further includes a second anti-corrosion functional layer 3141, which is disposed on the inner wall surface of the housing 311; the second anti-corrosion functional layer 3141 includes a coating disposed on the inner wall surface of the housing 311; and / or the second anti-corrosion functional layer 3141 includes a passivation layer formed by surface treatment of the inner wall surface of the housing 311.

[0082] The inner wall surface of the housing 311 is the side surface of the housing 311 facing the phase change channel 310. As an example, the second anti-corrosion functional layer 3141 covers the entire inner wall surface of the housing 311 to protect the entire inner wall surface of the housing 311.

[0083] The coating can be applied to the inner wall surface of the housing 311 by deposition or coating. The passivation layer can be applied to the inner wall surface of the housing 311 by chemical nickel plating, anodizing, or other methods to form a dense oxide or passivation film on the surface of the housing 311, thereby improving the corrosion resistance of the inner wall surface of the housing 311.

[0084] Electroless nickel plating is a technique that deposits a nickel-phosphorus (or nickel-boron) alloy layer on the surface of the casing 311 through an autocatalytic reaction, significantly improving the wear resistance, corrosion resistance, and surface finish of the casing 311. The applicability and effectiveness of electroless nickel plating vary slightly depending on the material of the casing 311 (e.g., aluminum alloy, stainless steel, titanium alloy, Hastelloy). For example, if the casing 311 is made of aluminum alloy, because aluminum alloys are prone to oxidation or corrosion, a special activation solution (such as a fluoride-containing solution) is usually required during the electroless nickel plating process. If the casing 311 is made of stainless steel, it is suitable for most electroless nickel plating processes, but care must be taken to avoid hydrogen embrittlement. If the casing 311 is made of titanium alloy, due to the strong chemical inertness of titanium, special activation treatment may be required. If the casing 311 is made of Hastelloy, Hastelloy has good corrosion resistance and is suitable for electroless nickel plating in high-temperature environments.

[0085] Anodizing is an electrochemical process mainly used to generate a dense oxide film on the surface of metals to improve their corrosion resistance and wear resistance.

[0086] The method of forming the second anti-corrosion functional layer 3141 on the inner wall surface of the housing 311 varies depending on the material of the housing 311. For example, aluminum alloy housings 311 generally form a passivation layer on the inner wall surface of the housing 311 by anodizing. Stainless steel housings 311 generally form a passivation layer on the inner wall surface of the housing 311 by chemical nickel plating. Titanium alloy housings 311 generally use laser cladding of titanium nitride coating to electrochemically passivate the inner wall surface of the housing 311 to form a passivation layer, thereby further improving the service life of the temperature distribution element 31.

[0087] In this embodiment, by providing a second anti-corrosion functional layer 3141 on the inner wall surface of the housing 311, the inner wall surface of the housing 311 can be protected, reducing the risk of chemical reaction between the inner wall surface of the housing 311 and the phase change working medium 313. Furthermore, the coating provided on the inner wall surface of the housing 311 for protection can be applied to housings 311 made of various materials, and the coating can be selected according to requirements for functions such as wear resistance, corrosion resistance, and insulation; moreover, the thickness of the coating can be flexibly adjusted from the nanometer level to the millimeter level. By surface treating the inner wall surface of the housing 311 to form a passivation layer for protection, the passivation layer has a strong bond with the housing 311, is not easily peeled off, and has a long service life; moreover, this solution has minimal impact on the volume of the phase change channel 310, effectively ensuring the temperature uniformity of the temperature equalization component 31.

[0088] Understandable, Figure 5 In the corresponding embodiment, the anti-corrosion functional layer 314 includes a first anti-corrosion functional layer 3142 and a second anti-corrosion functional layer 3141; the inner wall surface of the shell 311 is provided with the second anti-corrosion functional layer 3141, and the outer wall surface of the liquid-absorbing core 312 is provided with the first anti-corrosion functional layer 3142. Of course, in other embodiments, see... Figure 6 , Figure 6 Provided for yet another embodiment of this application Figure 3 The diagram shows a cross-sectional view of the temperature equalizer 31 along the AA direction. The anti-corrosion functional layer 314 may include a second anti-corrosion functional layer 3141, but does not include the first anti-corrosion functional layer 3142. That is, of the housing 311 and the liquid-absorbing core 312, only the inner wall surface of the housing 311 is provided with the second anti-corrosion functional layer 3141. Or, as... Figure 4 As shown, the anti-corrosion functional layer 314 may include a first anti-corrosion functional layer 3142, but does not include a second anti-corrosion functional layer 3141. That is, among the housing 311 and the liquid-absorbing core 312, only the outer wall surface of the liquid-absorbing core 312 is provided with the first anti-corrosion functional layer 3142.

[0089] In one embodiment, the material of the housing 311 is the same as or similar to the material of the absorbent core 312.

[0090] For example, both the housing 311 and the absorbent core 312 are made of stainless steel; or, the housing 311 is made of aluminum alloy and the absorbent core 312 is made of aluminum wire mesh.

[0091] In this embodiment, the housing 311 and the wick 312 are made of the same or similar materials. On the one hand, the possibility of chemical reaction between the housing 311 and the wick 312 is greatly reduced, especially during the circulation of the phase change working fluid 313 (such as water, ethanol, etc.). This effectively avoids degradation problems caused by electrochemical corrosion or contact with dissimilar materials, thus effectively reducing the risk of corrosion. On the other hand, using the same material ensures that the overall structure has higher stability in high-temperature and high-humidity environments, thereby extending the service life of the heat spreader 31. Furthermore, using the same or similar materials simplifies welding, bonding, or other connection processes, simplifying the manufacturing process. Moreover, the processing parameters (such as welding temperature, pressure, etc.) of the same material are easier to control, which helps to reduce production costs and improve yield. In addition, the wick 312 and the housing 311, made of the same or similar materials, can work together better, ensuring the consistency and efficiency of the heat conduction path and reducing the risk of increased thermal resistance due to material differences. Moreover, this consistency can optimize the overall heat dissipation performance of the heat spreader 31. Furthermore, depending on the materials used for the housing 311 and the liquid suction core 312, a phase change working medium 313 with less corrosiveness can be selected to reduce the risk that the phase change working medium 313 has a stronger corrosiveness to one of the housing 311 and the liquid suction core 312 and a relatively weaker corrosiveness to the other.

[0092] In one embodiment, under acidic conditions, the phase change working fluid 313 includes acetone; the shell 311 is made of Hastelloy; and the wick 312 is made of sintered nickel powder. This allows the temperature equalizer 31 to have good corrosion resistance even under acidic conditions, reducing the risk of failure and extending its service life.

[0093] Hastelloy is a type of corrosion-resistant nickel-based high-temperature alloy with excellent corrosion resistance and high-temperature strength. Nickel powder is sintered to form a porous liquid-absorbing core 312, which can generate strong capillary action and effectively promote the reflux of the phase change working medium 313 (such as water or ammonia); and nickel itself has good corrosion resistance, especially in alkaline environments.

[0094] In other examples, the corrosion-resistant heat exchanger 20 may also use Freon or water as its phase change medium 313.

[0095] In some examples, the heat exchanger 20 can also be matched with a phase change medium 313 according to its operating temperature range, and then the materials of the shell 311 and the wick 312 can be matched according to different phase change mediums 313, thereby improving the compatibility between the phase change medium 313 and the shell 311 / wick 312, making the heat exchanger 20 suitable for different extreme temperatures and corrosive environments, reducing the risk of corrosion of the heat exchanger 20, and extending the service life of the heat exchanger 20.

[0096] For example, when the heat exchanger 20 operates in a low-temperature range of -50℃ to 80℃; as an example, the phase change refrigerant 313 can be ammonia (NH3); the corresponding shell 311 can be made of aluminum alloy; and the wick 312 can be made of aluminum wire mesh. As another example, the phase change refrigerant 313 can be Freon; the corresponding shell 311 can be made of aluminum alloy / or copper; and the wick 312 can be made of aluminum wire mesh / or sintered copper powder. Of course, in other examples, the phase change refrigerant 313 can also be Freon, acetone (C3H6O), alcohol, or hydrocarbon refrigerants.

[0097] When the heat exchanger 20 operates in the medium temperature range of 20℃ to 200℃, as an example, the phase change working fluid 313 can be deionized water; the corresponding shell 311 can be made of 304 stainless steel or copper; and the wick 312 can be made of stainless steel wire or sintered copper powder. As another example, the phase change working fluid 313 can be mercury; the corresponding shell 311 can be made of nickel or its alloys; and the wick 312 can be made of sintered nickel powder. Of course, in other examples, the phase change working fluid 313 can also be made of thermally conductive materials such as mercury, cesium, or sulfur.

[0098] When the heat exchanger 20 operates in a high-temperature range of 300℃ to 800℃, as an example, the phase change working fluid 313 can be made of sodium-potassium alloy; the corresponding shell 311 can be made of titanium alloy; and the wicking core 312 can be made of stainless steel fiber braiding. As another example, the phase change working fluid 313 can be made of lithium; the corresponding shell 311 can be made of nickel or its alloys; and the wicking core 312 can be made of sintered nickel powder. Of course, in other examples, the phase change working fluid 313 can also be made of sodium, potassium, lithium, or silver.

[0099] See Figure 7 , Figure 7 This is a schematic diagram showing the distribution of the temperature equalization element 31 on the heat exchange element 20 according to an embodiment of this application.

[0100] In one embodiment, the heat exchanger 20 has a second central region aa and a second edge region surrounding the second central region aa; the second central region aa is a region radiating outward with the center of the heat exchanger 20 as the center and a predetermined length as the radius. The phase change channel 310 includes a main channel 3101 and a plurality of branch channels 3102. One end of the main channel 3101 serves as the first end of the temperature equalizer 31, and the first end of the temperature equalizer 31 extends to the second central region aa; one end of each of the plurality of branch channels 3102 is connected to the main channel 3101, and the other end of each of the plurality of branch channels 3102 extends to the second edge region and serves as a second end of the temperature equalizer 31.

[0101] In this embodiment, the temperature equalization element 31 is disposed on the heat exchange element 20 and is attached to the temperature equalization contact surface of the battery assembly 10.

[0102] In this configuration, when the battery assembly 10 is mounted on the heat exchanger 20, the first central region of the battery assembly 10 corresponds to the second central region aa of the heat exchanger 20, and the first edge region of the battery assembly 10 corresponds to the second edge region of the heat exchanger 20. Furthermore, the first central region and the second central region aa can have the same shape and size; the first edge region and the second edge region can also have the same shape and size. Alternatively, the orthographic projection of the first edge region onto the heat exchanger 20 can also be located within the second edge region, ensuring that the temperature equalization element 31 mounted on the heat exchanger 20 extends at least to the first edge region of the battery assembly 10, thereby achieving a better temperature equalization effect on the battery assembly 10.

[0103] It is understood that when the battery assembly 10 is disposed on the heat exchanger 20, the heat equalization component is in contact with the heat equalization contact surface of the battery assembly 10, and the first end of the heat equalization component 31 extends to the first central region of the battery assembly 10 to quickly absorb the heat of the battery cell 11 in the first central region. The second end of the heat equalization component 31 extends at least to the first edge region to balance the temperature of the battery cell 11 in the first central region and the first edge region of the battery assembly 10.

[0104] The heat exchanger 20 has a heat exchange contact surface configured to face the battery assembly 10. Specifically, the second central region aa and the second edge region of the heat exchanger 20 refer to the second central region aa and the second edge region of the heat exchange contact surface of the heat exchanger 20. The second central region aa can be a circular region or a polygonal region; the straight-line distance (i.e., the radius mentioned above) between each side of the polygonal region and the center of the second central region aa is the same. The polygonal region can be a square region, a triangular region, or a hexagonal region, etc.

[0105] For example, the area of ​​the second central region aa is less than or equal to the sum of the areas of the bottom or top surfaces of the four battery cells 11. As an example, the area of ​​the second central region aa may be the same as the sum of the areas of the bottom or top surfaces of one, two, three, or four battery cells 11.

[0106] Each heat exchanger 31 has a phase change channel 310 including a main channel 3101 and a plurality of branch channels 3102 respectively connected to the main channel 3101. One end of the main channel 3101 extends to the second central region aa of the heat exchanger 20, one of the plurality of branch channels 3102 is connected to the other end of the main channel 3101, and the remaining branch channels 3102 are connected between the two ends of the main channel 3101. It can be understood that in this embodiment, the heat exchanger 31 includes a first end extending to the second central region aa and a plurality of second ends extending to the second edge region.

[0107] For example, the heat exchanger 20 has a first centerline O along the first direction Y. The temperature equalization assembly includes four temperature equalization elements 31, which are symmetrically distributed about the first centerline O; two temperature equalization elements 31 located on the same side of the first centerline O are spaced apart along a second direction X that intersects the first direction Y; the second direction X may be perpendicular to the first direction Y.

[0108] In this embodiment, the heat of the battery cell 11 in the first central region can be quickly absorbed through the first end of the main channel 3101. This heat is transferred to multiple different edge positions through multiple branch channels 3102, thereby uniformizing the temperature of the battery cell 11 in the first central region and multiple different edge positions, improving the temperature uniformity of the battery assembly 10 and the overall performance of the battery device 200.

[0109] In one embodiment, please refer to... Figure 7 The heat exchanger 20 includes at least one heat exchange channel, which includes multiple branch channels 212; there is at least one branch channel 3102 between two adjacent branch channels 212.

[0110] The number and shape of the branch channels 212 in each heat exchange channel can be set according to the actual situation. For example, the number of branch channels 212 may include, but is not limited to, two, three, four, five, or other numbers. The multiple branch channels 212 can be arranged in a specific pattern or in a random pattern. The multiple branch channels 212 can be interconnected, so that the heat exchange fluid in the multiple branch channels 212 can flow to each other.

[0111] Each heat exchanger 20 has multiple branch channels 3102, which can be spaced apart from each other. There may be at least one branch channel 3102 between two branch channels 212, or there may be one branch channel 3102 between every two branch channels 212, or there may be multiple branch channels 3102 spaced apart between every two branch channels 212.

[0112] In the manufacturing process of heat exchanger 20, the lower heat exchanger plate 24 (see below) can be stamped. Figure 8 To form the first tank corresponding to the heat exchange channel, and then through a heat exchange upper plate 25 (see below) Figure 8 A heat exchanger 20 with a heat exchange channel is obtained by covering one side of the lower heat exchange plate 24 to block the opening of the first groove. It can be understood that in this embodiment, the housing 311 of the heat exchanger 31 includes a portion of the lower heat exchange plate 24 and a portion of the upper heat exchange plate 25.

[0113] Of course, in other embodiments, heat exchange channels can also be provided on the heat exchanger 20 in other forms, such as embedding a flexible tube on the outside of the heat exchanger 20 to form a heat exchange channel in the flexible tube. The heat exchange channel can be used to supply heat exchange fluid, which can include, but is not limited to, airflow, cooling water, cooling oil, or deionized water. When it is necessary to cool the battery cell 11, a heat exchange fluid with a temperature lower than that of the battery cell 11 can be injected into the heat exchange channel; when it is necessary to heat the battery cell 11, a heat exchange fluid with a temperature higher than that of the battery cell 11 can be injected into the heat exchange channel. Thus, the heat exchanger 20 is provided with heat exchange channels for supplying heat exchange fluid. Multiple battery cells 11 are in contact with the heat exchanger 20, and the heat exchange fluid in the heat exchange channels can cool or heat the multiple battery cells 11, thereby improving the heat exchange efficiency of the battery device 200.

[0114] The heat exchanger 20 and the temperature equalization element 31 can be set separately or integrally formed.

[0115] When the heat exchanger 20 and the heat equalizer 31 are set separately, multiple branch channels 212 can be opened in the heat exchanger 20, and then the heat equalizer 31 is fixed on the surface of the heat exchanger 20, and the orthographic projection of the branch channel 3102 of the heat equalizer 31 on the heat exchanger 20 is located between two branch channels 212, so that there is at least one branch channel 3102 between the two branch channels 212.

[0116] When the heat exchanger 20 and the temperature equalizer 31 are integrally formed, at least one branch channel 3102 can be processed between every two adjacent branch channels 212. For example, the heat exchange channel and the phase change channel 310 can be formed by integrally stamping the lower heat exchanger plate 24. During manufacturing, the lower heat exchanger plate 24 can be stamped to form a first groove corresponding to the heat exchange channel and a second groove corresponding to the phase change channel 310. Then, an upper heat exchanger plate 25 is placed over one side of the stamped lower heat exchanger plate 24 to simultaneously seal the openings of the first groove and the second groove, resulting in an integral component with the heat exchange channel and the phase change channel 310. The phase change channel 310 and the heat exchange channel are spaced apart, allowing them to act independently on the battery cell 11. Thus, the integrally formed heat exchanger 20 and the temperature equalizer 31, with the heat exchange channel and the phase change channel 310 spaced apart, improve the production efficiency of the heat exchanger 20 and the temperature equalizer 31, as well as the assembly efficiency of the battery device 200, etc.

[0117] In this embodiment, by having at least one branch channel 3102 between the two heat exchange channels, the heat exchange efficiency and temperature equalization efficiency of the battery cell 11 can be improved by reasonably arranging the temperature equalization component and the heat exchange element 20.

[0118] In one embodiment, please refer to... Figure 7 The heat exchanger 20 is divided into two heat exchange regions bb along the first direction Y; each heat exchange region bb includes at least one heat exchange channel, and each branch flow channel 212 of the heat exchange channel extends along the first direction Y and is spaced apart along the second direction X intersecting the first direction Y; the branch channel 3102 located between two adjacent branch flow channels 212 extends along the first direction Y to the second edge region of the heat exchanger 20.

[0119] The heat exchanger 20 is further provided with a fluid inlet 22 and a fluid outlet 23, which are respectively connected to the heat exchange channel. The fluid inlet 22 and the fluid outlet 23 are located on one side of the heat exchange region bb in the second direction X. The fluid inlet 22 can be used to allow the heat exchange fluid to flow into the heat exchange channel, and the fluid outlet 23 can be used to allow the heat exchange fluid to flow out of the heat exchange channel.

[0120] Two heat exchange zones bb are distributed on both sides of the first centerline O. For example, each heat exchange zone bb includes a heat exchange channel comprising a main inlet channel 211, multiple branch channels 212, and a main outlet channel 213. The multiple branch channels 212 are respectively connected to the fluid inlet 22 through the main inlet channel 211, and the multiple branch channels 212 are respectively connected to the fluid outlet 23 through the main outlet channel 213. The main inlet channel 211 and the main outlet channel 213 can extend along the second direction X. The length dimensions of each branch channel 212 along the first direction Y can be the same or different, or partially the same and partially different.

[0121] In this embodiment, by arranging two heat exchange regions bb spaced apart along the first direction Y, heat exchange and temperature equalization can be performed simultaneously for a larger number of battery cells 11, reducing the temperature difference between multiple battery cells 11 and improving the overall performance of the battery device 200. Furthermore, by rationally arranging the branch channels 3102 and branch flow channels 212, the heat exchange efficiency and temperature equalization efficiency for the battery cells 11 can be further improved. Additionally, by extending the branch flow channels 212 and 3102 along the first direction Y, the risk of mutual interference between the branch flow channels 212 and 3102 can be reduced, and the extension path of the branch channels 3102 can be shortened, thereby further improving the temperature equalization efficiency.

[0122] See Figure 8 , Figure 8 Provided for an embodiment of this application Figure 7 The diagram shows a cross-sectional view of the structure along the BB direction.

[0123] In one embodiment, the bottom wall of the phase change channel 310 is provided with a microgroove 315, and the liquid absorption core 312 covers the microgroove 315. At least a portion of the microgroove 315 extends along the first direction Y. At least two battery cells 11 are arranged in the first direction Y, and each channel 3102 contacts the at least two battery cells 11 arranged along the first direction Y.

[0124] The microgrooves 315 can be V-shaped, and there can be multiple microgrooves 315. The multiple microgrooves 315 can be spaced apart from each other along a direction perpendicular to the first direction Y. Of course, the microgrooves 315 can also be semi-circular or arc-shaped.

[0125] In this embodiment, by setting microgrooves 315 and extending them along the first direction Y, liquid phase change working fluid 313 that is not absorbed by the wick 312 can flow through the microgrooves 315 along the first direction Y. This makes it easier for the liquid phase change working fluid 313 to act on the battery cells 11 arranged along the first direction Y, further improving the temperature homogenization efficiency of the battery cells 11, reducing the temperature difference between multiple battery cells 11, and improving the overall performance of the battery device 200. In addition, by making each channel 3102 contact at least two battery cells 11 arranged along the first direction Y, the channel 3102 can perform temperature homogenization treatment on each battery cell 11 arranged along the first direction Y that it contacts, and the microgrooves 315 improve the temperature homogenization efficiency.

[0126] See Figure 9 , Figure 9 Provided for another embodiment of this application Figure 7 The diagram shows a cross-sectional view of the structure along the BB direction.

[0127] In one embodiment, the temperature equalization element 31 further includes a bundle-shaped strip 316, which is disposed in the phase change channel 310 and sandwiched between the liquid absorption core 312 and the top wall of the housing 311.

[0128] The bundle-shaped strip 316 extends along the first direction Y and is used to limit excessive deformation of the liquid-absorbing core 312. When the temperature equalization component 31 and the heat exchange component 20 are integrally formed, the bundle-shaped strip 316 is sandwiched between the liquid-absorbing core 312 and the upper heat exchange plate 25. During manufacturing, a groove can be stamped into the lower heat exchange plate 24, and the liquid-absorbing core 312 can be installed in the groove. The bundle-shaped strip 316 is installed on the side of the liquid-absorbing core 312 facing away from the bottom wall of the groove. Finally, the upper heat exchange plate 25 presses the bundle-shaped strip 316 onto the side facing away from the liquid-absorbing core 312 and seals the groove opening to form the temperature equalization assembly.

[0129] The dimension of the bundle strip 316 along the second direction X can be the same as or slightly smaller than the dimension of the absorbent core 312 along the second direction X.

[0130] In this embodiment, the bundle-shaped strip 316 is sandwiched between the liquid-absorbing core 312 and the top wall of the temperature equalization element 31, and can limit the excessive deformation of the liquid-absorbing core 312 to block at least part of the redundant space 317. The redundant space 317 is the part of the phase change channel 310 that is not filled with the liquid-absorbing core 312.

[0131] See Figure 10 , Figure 10 Provided for yet another embodiment of this application Figure 7 The diagram shows a cross-sectional view of the structure along the BB direction.

[0132] In one embodiment, the portion of the phase change channel 310 that is not filled with the liquid-absorbing core 312 serves as a redundant space 317. The liquid-absorbing core 312 is fitted to the inner wall of the housing 311, and the liquid-absorbing core 312 encloses the redundant space 317, where the phase change working fluid 313 is located.

[0133] The liquid suction core 312 and the redundant space 317 extend in the same direction as the phase change channel 310. That is, the liquid suction core 312 and the redundant space 317 located in the main channel 3101 extend along the extension direction of the main channel 3101. The liquid suction core 312 and the redundant space 317 located in the branch channel 3102 extend along the first direction Y.

[0134] The liquid suction core 312 can be in the shape of a U-shape. The specific shape and thickness of the liquid suction core 312 can be set according to the specific structure and required size of the phase change channel 310.

[0135] In this embodiment, by fitting the liquid-absorbing core 312 against the inner wall of the phase change channel 310 and surrounding the redundant space 317, it is easier for the liquid phase change working fluid 313 to vaporize and smoothly enter the redundant space 317, and for the gaseous phase change working fluid 313 to be absorbed by the liquid-absorbing core 312 after liquefaction. This improves the stability of the liquid-absorbing core 312 within the phase change channel 310 and mitigates the risk of decreased temperature homogenization efficiency due to deformation of the liquid-absorbing core 312. Simultaneously, it further reduces the risk of the phase change working fluid 313 contacting the shell 311, leading to a chemical reaction and potential failure of the temperature homogenization element 31.

[0136] 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 by, The battery device comprises: a battery assembly comprising a plurality of battery cells; the battery assembly has a first central region and a first edge region surrounding the first central region; a heat exchange element on which the battery assembly is arranged; a uniform temperature assembly comprising a plurality of uniform temperature elements in contact with at least two of the battery cells; the uniform temperature element has a first end and a second end, the first end of the uniform temperature element extends to the first central region, and the second end of the uniform temperature element extends to the first edge region; the uniform temperature element comprises a shell, a wick, a phase change working medium, a corrosion-resistant functional layer, and a bundle-shaped strip; the shell has a phase change channel; the wick and the phase change working medium are arranged in the phase change channel; the wick is a reticular structure and absorbs the liquid phase change working medium through pores; the phase change working medium can chemically react with the wick; the corrosion-resistant functional layer comprises a first corrosion-resistant functional layer and a second corrosion-resistant functional layer; the first corrosion-resistant functional layer is arranged on the outer wall surface of the wick and is used to reduce the probability of chemical reaction between the outer wall surface of the wick and the phase change working medium; the first corrosion-resistant functional layer comprises a surface structure layer formed after the outer wall surface of the wick is treated to be hydrophobic or hydrophilic; the second corrosion-resistant functional layer is arranged on the inner wall surface of the shell; and the bundle-shaped strip is arranged in the phase change channel and is clamped between the wick and the top wall of the shell. The bottom wall of the phase change channel is provided with a micro groove, the wick covers the micro groove, and at least part of the micro groove extends in a first direction; wherein at least two of the battery cells are arranged in the first direction. The part of the phase change channel not filled with the wick serves as a redundant space, the liquid phase change working medium enters the redundant space after vaporization, and the bundle-shaped strip limits excessive deformation of the wick to block at least part of the redundant space.

2. The battery device according to claim 1, wherein the second corrosion-resistant functional layer comprises a coating layer arranged on the inner wall surface of the shell; and / or the second corrosion-resistant functional layer comprises a passivation layer formed by surface treatment of the inner wall surface of the shell.

3. The battery device according to claim 1, wherein the material of the shell is the same as or similar to the material of the wick.

4. The battery device according to claim 3, wherein in an acidic environment, the phase change working medium comprises acetone; the material of the shell comprises hastelloy; and the material of the wick comprises nickel powder sintering.

5. The battery device according to any one of claims 1-4, wherein the heat exchange element has a second central region and a second edge region surrounding the second central region; the second central region is a region radially outward from the center of the heat exchange element with a preset length as the radius. The phase change channel comprises a main channel and a plurality of branch channels, one end of the main channel serving as a first end of the uniform temperature piece, the first end of the uniform temperature piece extending to the second central region; one end of each of the plurality of branch channels is in communication with the main channel, and the other end of each of the plurality of branch channels extends to the second edge region and serves as a second end of the uniform temperature piece.

6. The battery device according to claim 5, wherein The heat exchange piece comprises at least one heat exchange channel, the heat exchange channel comprising a plurality of branch flow passages; and at least one branch channel is arranged between two adjacent branch flow passages.

7. The battery device according to claim 6, wherein The heat exchange piece is divided into two heat exchange regions along a first direction; each heat exchange region comprises at least one heat exchange channel, each branch flow passage of the heat exchange channel extends along the first direction and is arranged in a spaced manner along a second direction intersecting the first direction; and the branch channel between two adjacent branch flow passages extends to a second edge region of the heat exchange piece along the first direction.

8. The battery device according to any one of claims 1-4, wherein The liquid absorbing core is arranged in abutment with the inner side wall of the shell, the liquid absorbing core encloses the redundant space, and the phase change working medium is located in the redundant space.

9. An electric device, characterized by The battery device comprises the battery device according to any one of claims 1-8.

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