Battery device and electric equipment

Abstract

The invention provides a battery device and electric equipment. The battery device includes: a battery assembly including a plurality of battery cells; the battery assembly is provided with a first central area and a first edge area surrounding the first central area; the battery assembly is arranged on the heat exchange piece; the temperature equalizing assembly comprises a plurality of temperature equalizing parts, and the temperature equalizing parts are in contact with at least two battery monomers; the first end of the temperature equalizing piece extends to the first central area, and the second end of the temperature equalizing piece extends to the first edge area; the temperature equalizing piece comprises a shell, a liquid absorbing core, a phase change working medium and an anti-corrosion functional layer, and the shell is provided with a phase change channel; the liquid absorbing core and the phase change working medium are arranged in the phase change channel; the anti-corrosion functional layer comprises a first anti-corrosion functional layer, and the first anti-corrosion functional layer is arranged on the outer wall surface of the wick; the first anti-corrosion functional layer comprises a surface structure layer formed after hydrophobic and / or hydrophilic treatment is conducted on the outer wall face of the liquid absorption core. According to the battery device, the temperature uniformity is improved; and the risk of failure of the temperature equalizing piece can be reduced, and the service life of the temperature equalizing piece is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery device and an electrical equipment. Background Art

[0002] With the leapfrog development of new energy vehicles, the market share of new energy vehicles is getting higher and higher, and the market has higher and higher performance requirements for the battery devices of new energy vehicles.

[0003] The battery device includes a plurality of battery cells. During the charging and discharging process of the battery device, due to factors such as different positions, the temperature difference between the plurality of battery cells is relatively large, resulting in poor overall temperature uniformity of the battery device, thereby reducing the overall performance of the battery device; moreover, for the temperature equalizing member for performing temperature equalizing treatment on the battery device, it is prone to failure problems and has a low service life. Summary of the Invention

[0004] The battery device and the electrical equipment provided by this application aim to solve the problems that the existing battery device has poor overall temperature uniformity, and the temperature equalizing member is prone to failure and has a low service life.

[0005] To solve the above technical problems, a technical solution adopted by this application is: to provide a battery device, which includes: A battery assembly, including 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 member, on which the battery assembly is disposed; A temperature equalizing assembly, including a plurality of temperature equalizing members, the temperature equalizing members are in contact with at least two battery cells; the temperature equalizing member has a first end and a second end, the first end of the temperature equalizing member extends to the first central region, and the second end of the temperature equalizing member extends to the first edge region; the temperature equalizing member includes a housing, a wick, a phase change working fluid and an anti-corrosion functional layer, the housing has a phase change channel; the wick and the phase change working fluid are disposed in the phase change channel; the anti-corrosion functional layer includes a first anti-corrosion functional layer, and the first anti-corrosion functional layer is disposed on the outer wall surface of the wick; the first anti-corrosion functional layer includes a surface structure layer formed by subjecting the outer wall surface of the wick to hydrophobic and / or hydrophilic treatment.

[0006] In the above solution, by providing a temperature equalizing component, the temperature equalizing element of the temperature equalizing component contacts at least two battery cells, facilitating heat transfer between the temperature equalizing element and the battery cells. At the same time, by extending the first end of each temperature equalizing element to the first central region and the second end to the first edge region; in this way, the temperature between the first central region and the first edge region of the battery device can be balanced by the temperature equalizing element, thereby improving the thermal management performance and temperature uniformity of the battery device. In addition, by providing a first anti-corrosion functional layer on the outer wall surface of the wick of the temperature equalizing element, the surface of the wick can be protected by the first anti-corrosion functional layer, thus effectively reducing the risk of chemical reaction between the surface of the wick and the phase change working fluid, resulting in the failure of the temperature equalizing element, and enhancing the service life of the temperature equalizing element. Moreover, using the surface structure layer formed by hydrophobizing and / or hydrophilizing the outer wall surface of the wick as the anti-corrosion functional layer for protecting the wick has less impact on the liquid absorption effect of the wick compared to the solution of directly coating a protective layer on the surface of the wick, and can effectively ensure the liquid guiding effect of the wick on the liquid phase change working fluid.

[0007] In one embodiment, the anti-corrosion functional layer includes a second anti-corrosion functional layer provided on the inner wall surface of the housing; the second anti-corrosion functional layer includes a coating provided 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.

[0008] The above solution can protect the inner wall surface of the housing through the second anti-corrosion functional layer, reducing the risk of chemical reaction between the inner wall surface of the housing and the phase change working fluid; and by protecting the housing with the coating, it can be applied to housings 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. And by surface treating the inner wall surface of the housing to form a passivation layer for protecting the housing, the bonding force between the passivation layer and the housing is strong, the passivation layer is not easily peeled off from the housing, and it has a long service life; and this solution has less impact on the volume of the phase change channel, and can effectively ensure the temperature equalizing effect of the temperature equalizing element.

[0009] In one embodiment, the material of the housing is the same as or similar to the material of the wick. In this way, the possibility of chemical reaction between the housing and the wick is greatly reduced; and the same material can ensure higher stability of the overall structure in high-temperature and high-humidity environments, thereby extending the service life of the temperature equalizing element. In addition, using the same or similar materials can simplify welding, bonding, or other connection processes, simplifying the manufacturing process: and 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 the yield rate. In addition, a phase change working fluid with less corrosion can also be selected according to the materials of the housing and the wick, reducing the risk that the phase change working fluid has strong corrosion on one of the housing and the wick and relatively weak corrosion on the other.

[0010] In one embodiment, in an acidic environment, the phase change working fluid includes acetone; the material of the housing includes Hastelloy; the material of the wick includes sintered nickel powder. In this way, the temperature equalizing member can also have a good anti-corrosion effect under acidic conditions, reducing the risk of failure of the temperature equalizing member and extending the service life of the temperature equalizing member.

[0011] In one embodiment, the heat exchange member 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 exchange member as the center and a preset length as the radius; the phase change channel includes a main channel and a plurality of branch channels, one end of the main channel serves as the first end of the temperature equalizing member, and the first end of the temperature equalizing member extends to the second central region; one ends of the plurality of branch channels are respectively communicated with the main channel, and the other ends of the plurality of branch channels respectively extend to the second edge region and respectively serve as a second end of the temperature equalizing member.

[0012] 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, and these heats are respectively transferred to a plurality of different edge positions through the plurality of branch channels, so as to equalize the temperatures of the battery cells in the first central region and the plurality of different edge positions, improving the temperature equalizing effect of the battery module and the overall performance of the battery device.

[0013] In one embodiment, the heat exchange member includes at least one heat exchange channel, and the heat exchange channel includes a plurality of branch flow channels; there is at least one branch channel between two adjacent branch flow channels. In this way, there is at least one branch channel between two heat exchange channels, and the heat exchange efficiency and temperature equalizing efficiency of the battery cells can be improved by reasonably arranging the temperature equalizing component and the heat exchange member.

[0014] In one embodiment, the heat exchange member is divided into two heat exchange regions along a first direction; each heat exchange region includes at least one heat exchange channel, and the respective branch flow channels of the heat exchange channel extend along the first direction and are spaced apart along a second direction intersecting the first direction; the branch channels located between two adjacent branch flow channels extend along the first direction to the second edge region of the heat exchange member.

[0015] The above solution can simultaneously perform heat exchange and temperature equalizing treatment for a larger number of battery cells by arranging two heat exchange regions spaced apart in the first direction, reducing the temperature difference between the plurality of battery cells and improving the overall performance of the battery device. In addition, the heat exchange efficiency and temperature equalizing efficiency of the battery cells can be further improved by reasonably arranging the branch channels and the branch flow channels. Moreover, by making the branch flow channels and the branch channels extend along the first direction respectively, the risk of interference between the branch flow channels and the branch channels can be reduced, and the extension path of the branch channels can be shortened, thereby further improving the temperature equalizing efficiency.

[0016] In one embodiment, the bottom wall of the phase change channel is provided with micro-grooves, the wick covers the micro-grooves, and at least a part of the micro-grooves 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 in the first direction.

[0017] In the above solution, the liquid phase change working medium that is not absorbed by the wick can flow along the first direction through the micro-grooves, which makes it easier for the liquid phase change working medium to act on the battery cells arranged in 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.

[0018] In one embodiment, the temperature equalizing member further includes a beam-shaped strip, which is arranged in the phase change channel and clamped between the wick and the top wall of the housing. Wherein, the beam-shaped strip is clamped between the wick and the top wall of the temperature equalizing member, and can limit the excessive deformation of the wick to block at least the redundant space.

[0019] In one embodiment, the part of the phase change channel that is not filled with the wick is used as a redundant space. The wick is attached to the inner side wall of the housing, and the wick encloses to form a redundant space, and the phase change working medium is located in the redundant space. In this way, the risk that the phase change working medium contacts the housing, resulting in a chemical reaction between the phase change working medium and the housing and causing the temperature equalizing member to fail, can be further reduced.

[0020] To solve the above technical problems, another technical solution adopted by this application is: to provide an electrical device, which includes the battery device involved above.

[0021] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the specific embodiments of this application are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of this application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 is a schematic structural diagram of an electrical device provided by an embodiment of this application; Figure 2 is an exploded view of a battery device provided by some embodiments of this application; Figure 3 is a plan view of a temperature equalizing member provided by an embodiment of this application; Figure 4 A schematic cross-sectional structure diagram of the shown temperature equalizing component along the A-A direction provided by an embodiment of the present application; Figure 3 Figure 5 A schematic cross-sectional structure diagram of the shown temperature equalizing component along the A-A direction provided by another embodiment of the present application; Figure 3 Figure 6 A schematic cross-sectional structure diagram of the shown temperature equalizing component along the A-A direction provided by still another embodiment of the present application; Figure 3 Figure 7 A schematic distribution diagram of the temperature equalizing component provided by an embodiment of the present application on the heat exchange component; Figure 8 A schematic cross-sectional structure diagram of the shown structure along the B-B direction provided by an embodiment of the present application; Figure 7 Figure 9 A schematic cross-sectional structure diagram of the shown structure along the B-B direction provided by another embodiment of the present application; Figure 7 Figure 10 A schematic cross-sectional structure diagram of the shown structure along the B-B direction provided by still another embodiment of the present application. Figure 7

[0023] Description of reference numerals 100 Electrical appliance component; 200 Battery device; 10 Battery assembly; 11 Battery cell; 20 Heat exchange component; aa Second central region; 211 Main liquid inlet channel; 212 Branch channel; 213 Main liquid outlet channel; bb Heat exchange region; 22 Fluid inlet; 23 Fluid outlet; 24 Heat exchange lower plate; 25 Heat exchange upper plate; 31 Temperature equalizing component; 310 Phase change channel; 3101 Main channel; 3102 Branch channel; 311 Housing; 312 Liquid absorption core; 313 Phase change working medium; 314 Anticorrosion functional layer; 3141 Second anticorrosion functional layer; 3142 First anticorrosion functional layer; 315 Microgroove; 316 Beam-shaped strip; 317 Redundant space; 40 Battery box; 41 Frame structure; 42 Upper cover plate. Detailed implementation manners Hereinafter, embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and thus are only examples and should not be used to limit the protection scope of the present application.

[0024] ​​​​​​Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0025] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0026] Reference to "embodiment" herein means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0027] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0028] In the description of the embodiments of this application, the term "a plurality of" means more than two (including two). Similarly, "a plurality of groups" means more than two groups (including two groups), and "a plurality of pieces" means more than two pieces (including two pieces).

[0029] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0030] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0031] At present, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in many fields such as aerospace. With the continuous expansion of the application fields of batteries, the market demand is also continuously increasing.

[0032] The battery device includes a plurality of battery cells. During the charging and discharging process of the battery device, due to factors such as different positions, the temperature difference between the plurality of battery cells is relatively large, resulting in poor overall temperature uniformity of the battery device, and thus reducing the overall performance of the battery device. For this reason, in related technologies, a temperature equalizing member is usually provided on the battery device to perform temperature equalizing treatment on the battery device. However, the performance of these temperature equalizing members is limited by the compatibility of the phase change working fluid with the housing and the wick. If a chemical reaction occurs between the phase change working fluids (such as corrosion, gas generation), it will cause the temperature equalizing member to fail and affect the service life of the temperature equalizing member. Moreover, in related technologies, the combination selection of the materials of the phase change working fluid and the housing / wick is relatively single, and the problem of the compatibility of the phase change working fluid with the materials of the housing / wick in high-temperature, low-temperature, or corrosive environments has not been systematically solved.

[0033] Based on this, the embodiments of the present application provide a battery device, which can not only perform temperature equalizing treatment on the battery device, but also reduce the risk of chemical reaction between the temperature equalizing member and the housing and / or the wick, resulting in the failure of the temperature equalizing member, and improve the service life of the temperature equalizing member.

[0034] The following will describe the present application in detail with reference to the drawings and embodiments.

[0035] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the electrical equipment provided by the present application.

[0036] In one embodiment, an electrical equipment is provided. The electrical equipment includes an electrical appliance component 100 and a battery device 200. The battery device 200 is electrically connected to the electrical appliance component 100. The battery device 200 is used to provide electrical energy for the electrical equipment so that the electrical appliance component 100 can work.

[0037] The electrical equipment can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, a range extender vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, a planer, etc.

[0038] For the convenience of description, the following embodiments will take the electrical equipment as a vehicle as an example for illustration.

[0039] The electrical component 100 can be an element or device that can use electricity; the electrical component 100 can be a controller and electronic components, etc., and the controller can be a central processing unit (CPU for short), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0040] In some examples, the electrical equipment can be a vehicle, and the electrical component 100 can be a vehicle lamp (such as a headlamp, a taillight, etc.), a display screen, an instrument panel, a control system (such as a controller), etc. The vehicle can also include a vehicle frame, and both the battery device 200 and the electrical component 100 are installed on the vehicle body.

[0041] Please refer to Figures 2 to 4 , Figure 2 which is a disassembled schematic diagram of the battery device 200 provided by some embodiments of the present application; Figure 3 which is a plan view of the temperature equalizing part 31 provided by an embodiment of the present application; Figure 4 which is provided by an embodiment of the present application Figure 3 A sectional structure schematic diagram of the temperature equalizing part 31 shown along the A-A direction.

[0042] In one embodiment, a battery device 200 is provided. The battery device 200 includes a battery assembly 10, a heat exchange member 20, and a temperature equalizing 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 exchange member 20. The temperature equalizing assembly includes a plurality of temperature equalizing members 31. The temperature equalizing members 31 are in contact with at least two battery cells 11; the temperature equalizing members 31 have a first end and a second end. The first end of the temperature equalizing member 31 extends to the first central region, and the second end of the temperature equalizing member 31 extends to the first edge region; the temperature equalizing member 31 includes a housing 311, a wick 312, a phase change working fluid 313, and an anti-corrosion functional layer 314. The housing 311 has a phase change channel 310; the wick 312 and the phase change working fluid 313 are disposed in the phase change channel 310; the anti-corrosion functional layer 314 includes a first anti-corrosion functional layer 3142, and the first anti-corrosion functional layer 3142 is disposed on the outer wall surface of the wick 312; the first anti-corrosion functional layer 3142 includes a surface structure layer formed by subjecting the outer wall surface of the wick 312 to hydrophobic and / or hydrophilic treatment.

[0043] Wherein, the first central region may be a region radiating outward with the center of the battery assembly 10 as the center of a circle and a preset length as the radius.

[0044] As an example, the battery assembly 10 has a temperature equalizing contact surface, and the temperature equalizing contact surface of the battery assembly 10 is configured to be in contact with the temperature equalizing assembly. The first central region and the first edge region of the battery assembly 10 specifically refer to the first central region and the first edge region of the temperature equalizing contact surface of the battery assembly 10. Among them, the first central region may 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 may be a square region, a triangular region, a hexagonal region, etc.

[0045] Exemplarily, the area of the first central region is less than or equal to the sum of the bottom or top areas of four battery cells 11. As an example, the area of the first central region may be the same as the sum of the bottom or top areas of one, two, three, or four battery cells 11.

[0046] Exemplarily, the ratio range 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.

[0047] A plurality of battery cells 11 can form a battery assembly 10 by series connection, parallel connection, or a combination of series and parallel connections. In some other embodiments, a plurality of battery cells 11 can also be first connected in series, parallel, or in a combination of series and parallel, and then arranged and fixed to form a battery assembly 10. In still other embodiments, a plurality of battery cells 11 can also be first connected in series, parallel, or in a combination of series and parallel, and then arranged and fixed to form a plurality of components, and the plurality of components are then connected in series, parallel, or in a combination of series and parallel to form an integral body.

[0048] As an example, a plurality of battery cells 11 can be fixed by cable ties or the like to form a battery assembly 10. As an example, a plurality of battery cells 11 can also be fixed by end plates, side plates, etc. to form a battery assembly 10.

[0049] The battery cell 11 involved in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. Among them, 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 in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0050] The battery cell 11 can include a housing, an electrode assembly, and other functional components. The housing includes an end cap and a bottom case. The end cap refers to a component that covers the opening of the bottom case to isolate the internal environment of the battery cell 11 from the external environment. Without limitation, the shape of the end cap can be adapted to the shape of the bottom case to cooperate with the bottom case. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap is not easily deformed when subjected to extrusion and collision, enabling the battery cell 11 to have higher structural strength and improved safety performance.

[0051] Functional components such as electrode terminals can be provided on the end cap. The electrode terminals can be used for electrically connecting with the electrode assembly to output or input the electric energy of the battery cell 11. In some embodiments, the electrode terminals can include pole columns. The pole columns can include a positive pole column and a negative pole column, which are used for the output of current and connection with an external circuit. In some embodiments, an explosion-proof component for discharging the internal pressure when the internal pressure or temperature of the battery cell 11 reaches a threshold can also be provided on the end cap. The material of the end cap can also be various. For example, the material of the end cap includes but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating component can also be provided on the inner side of the end cap. The insulating component can be used to isolate the electrical connection components in the bottom case from the end cap to reduce the risk of short circuit. Exemplarily, the insulating component can be plastic, rubber, etc. The bottom case is a component used to cooperate with the end cap to form the internal environment of the battery cell 11. Among them, the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The bottom case and the end cap can be independent components. An opening can be provided on the bottom case, and the end cap is covered on the opening to form the internal environment of the battery cell 11. Without limitation, the end cap and the bottom case can also be integrated. Specifically, the end cap and the bottom case can first form a common connection surface before other components are put into the case, and when the inside of the bottom case needs to be encapsulated, the end cap is then covered on the bottom case. The bottom case can be of various shapes and sizes. For example, it can be cuboid-shaped, cylindrical-shaped, hexagonal prism-shaped, etc. Specifically, the shape of the bottom case can be determined according to the specific shape and size of the electrode assembly. The material of the bottom case can be various. For example, the material of the bottom case includes but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The electrode assembly is a component in the battery cell 11 where an electrochemical reaction occurs. One or more electrode assemblies can be included in the bottom case. The electrode assembly is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and generally, a separator is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active substances constitute the main body part of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active substances respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located at one end of the main body part together or at both ends of the main body part respectively. During the charging and discharging process of the battery, the positive active substance and the negative active substance react with the electrolyte, and the electrode tabs are connected to the electrode terminals to form a current loop.

[0052] In some embodiments, the battery device 200 further includes a battery box body 40. The battery box body 40 is formed with a receiving groove, and the battery assembly 10 is disposed in the receiving groove. As Figure 2As shown, the battery box body 40 may include a frame structure 41 and an upper cover plate 42. The frame structure 41 may be arranged in a ring shape, and the upper cover plate 42 may be covered at an opening position of the frame structure 41 to form a receiving groove of the battery box body 40, and the battery assembly 10 is arranged in the receiving groove. In some embodiments, the battery box body 40 may further include a bottom guard plate, and the bottom guard plate may be located on a side of the battery assembly 10 away from the upper cover plate 42. The bottom guard plate is fixedly connected to the frame structure 41, thereby playing a better protective role for the temperature equalizing assembly.

[0053] Each temperature equalizing member 31 is independent of each other. In this way, the setting method of the temperature equalizing member 31 is more flexible, and both the temperature equalizing performance and the sealing performance are better.

[0054] The temperature equalizing member 31 has a first end and a second end. One end of the temperature equalizing member 31 corresponding to the battery cell 11 with a higher temperature is defined as the high temperature end, and one end of the temperature equalizing member 31 corresponding to the battery cell 11 with a lower temperature is defined as the low temperature end. In the embodiment of the present application, the first end of the temperature equalizing member 31 is the high temperature end, and the second end is the low temperature end.

[0055] At least two battery cells 11 are in contact with different positions of the temperature equalizing member 31. At least two battery cells 11 can perform heat exchange with the temperature equalizing member 31. For example, the projections of at least two battery cells 11 on the temperature equalizing member 31 and the projection of the liquid absorption core 312 on the temperature equalizing member 31 at least partially overlap. When there is an obvious temperature difference between at least two battery cells 11, when the battery cell 11 with a higher temperature contacts the temperature equalizing member 31, the liquid phase change working medium 313 in the temperature equalizing member 31 can be vaporized under the influence of the temperature of the battery cell 11 with a higher temperature. The vaporized phase change working medium 313 can move to the position of the battery cell 11 with a lower temperature in the phase change channel 310. The gaseous phase change working medium 313 in the temperature equalizing member 31 can be liquefied under the influence of the temperature of the battery cell 11 with a lower temperature. The liquefied phase change working medium 313 can infiltrate the liquid absorption core 312 and diffuse to the position of the battery cell 11 with a higher temperature under the action of the liquid absorption core 312. The gaseous phase change working medium 313 and the liquid phase change working medium 313 circulate in the phase change channel 310 to realize the heat conduction of the battery cells 11 and reduce the temperature difference between the battery cells 11 at different temperatures.

[0056] The housing 311 may be in a hollow structure, and a phase change channel 310 is formed inside the housing 311. The phase change channel 310 is a closed space. The material of the housing 311 includes aluminum, copper, stainless steel, titanium alloy, nickel-based alloy or Hastelloy.

[0057] The phase change working medium 313 may include, but is not limited to, water, ammonia, acetone, liquid metal (such as sodium-potassium alloy). The phase change working medium 313 may include two states, liquid or gas. The gaseous phase change working medium 313 can be liquefied under the action of low temperature, and the liquid phase change working medium 313 can be vaporized under the action of high temperature.

[0058] The wick 312 may have a specific porosity and permeability. The wick 312 can absorb the liquid phase change working fluid 313. The liquid phase change working fluid 313 can permeate through the wick 312 and return to the high-temperature end of the temperature equalizing member 31 through the wick 312. The wick 312 can be fixed in the phase change channel 310 by means of welding, bonding, etc. The material of the wick 312 includes sintered copper powder, stainless steel wire mesh, titanium fiber, etc.

[0059] In one example, combined with Figure 4 , a first anti-corrosion functional layer 3142 is provided on the entire outer wall surface of the wick 312. In another example, a first anti-corrosion functional layer 3142 is provided on a part of the outer wall surface of the wick 312, and the remaining outer wall surface is not provided with the first anti-corrosion functional layer 3142. Exemplarily, the first anti-corrosion functional layer 3142 may not be provided on the outer wall surface of the side where the wick 312 contacts the housing 311, and the other outer wall surfaces are all provided with the first anti-corrosion functional layer 3142.

[0060] 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 wick 312. Hydrophobic treatment is a technology that changes the surface properties of materials to make them have the ability to repel water molecules. This technology is widely used in the fields of waterproofing, anti-fouling, anti-corrosion, etc. The solutions for hydrophobic treatment include coating method, micro-nano structure manufacturing, chemical modification, etc. Among them, the coating method is to coat a layer of material with low surface energy (such as fluoride, siloxane, etc.) on the surface of the wick 312 to form a superhydrophobic coating. Micro-nano structure manufacturing is to imitate the superhydrophobic phenomenon in nature (such as the lotus effect), and construct a rough structure on the surface of the wick 312 through micro-nano processing technology, and combine with low surface energy substances to form a superhydrophobic surface. Chemical modification is to introduce low surface energy functional groups into the surface molecular chain of the wick 312 through chemical reactions, so as to endow the wick 312 with hydrophobicity.

[0061] As an example, the first anti-corrosion functional layer 3142 includes a surface structure layer formed on the outer wall surface of the liquid absorption core 312 after hydrophilic treatment. Hydrophilic treatment is a technique that changes the surface properties of a material to make it easier to adsorb water molecules. This technique can effectively reduce the adsorption of corrosive media (such as oxygen, chloride ions, etc.) on the material surface, thereby improving the anti-corrosion performance. The solutions for hydrophilic treatment include coating method, surface oxidation treatment, hydroxylation modification, etc. Among them, the coating method is to coat a layer of hydrophilic material with high surface energy (such as hydroxylated siloxane, polyethylene glycol, etc.) on the surface of the liquid absorption core 312 to form a hydrophilic coating. Surface oxidation treatment is to generate a dense oxide film on the liquid absorption core 312 through chemical or electrochemical methods. This oxide film has hydrophilicity and good anti-corrosion performance. For example, anodic oxidation method or chemical passivation method. Hydroxylation modification is to introduce hydroxyl groups (-OH) into the surface molecular chain of the liquid absorption core 312 through chemical reactions to endow it with hydrophilicity. For example, acid-base treatment or plasma treatment.

[0062] Of course, in other embodiments, the first anti-corrosion functional layer 3142 can also be a coating structure provided on the surface of the liquid absorption core 312.

[0063] In this embodiment, by making the temperature equalizing member 31 contact at least two battery cells 11, it is convenient for heat transfer between the temperature equalizing member 31 and the battery cells 11; further, by making the first end of each temperature equalizing member 31 extend to the first central region and the second end extend to the first edge region; in this way, the temperature equalizing 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. In addition, by providing the first anti-corrosion functional layer 3142 on the outer wall surface of the liquid absorption core 312 of the temperature equalizing member 31, the surface of the liquid absorption core 312 can be protected by the first anti-corrosion functional layer 3142, thereby effectively reducing the risk of chemical reaction between the surface of the liquid absorption core 312 and the phase change working fluid 313, resulting in the failure of the temperature equalizing member 31, and improving the service life of the temperature equalizing member 31. Moreover, using the surface structure layer formed by hydrophobic and / or hydrophilic treatment of the outer wall surface of the liquid absorption core 312 as the anti-corrosion functional layer 314 for protecting the liquid absorption core 312 has less influence on the liquid absorption effect of the liquid absorption core 312 compared with the scheme of directly coating a protective layer on the surface of the liquid absorption core 312, and can effectively ensure the liquid guiding effect of the liquid absorption core 312 on the liquid phase change working fluid 313.

[0064] Among them, the balance of the temperature 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 not greater than 5°.

[0065] See Figure 5 , Figure 5Provided for another embodiment of the present application Figure 3 A schematic cross-sectional structure diagram of the temperature equalizing member 31 along the A-A direction as shown

[0066] In one embodiment, the anti-corrosion functional layer 314 further includes a second anti-corrosion functional layer 3141, and the second anti-corrosion functional layer 3141 is provided on the inner wall surface of the housing 311; the second anti-corrosion functional layer 3141 includes a coating provided 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

[0067] The inner wall surface of the housing 311 is the 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

[0068] Among them, the coating can be provided on the inner wall surface of the housing 311 by means of deposition or coating. The passivation layer can be used to perform surface treatment on the inner wall surface of the housing 311 by means of electroless nickel plating, anodic oxidation, etc., so as to generate 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

[0069] Electroless nickel plating is a technology for depositing a nickel-phosphorus (or nickel-boron) alloy layer on the surface of the housing 311 through an autocatalytic reaction, which can significantly improve the wear resistance, corrosion resistance and surface finish of the housing 311. Among them, when the housing 311 is made of different materials (such as aluminum alloy, stainless steel, titanium alloy, Hastelloy), the applicability and effect of electroless nickel plating are slightly different. For example, if the material of the housing 311 is aluminum alloy, because aluminum alloy is prone to oxidation or corrosion, a special activation solution (such as a solution containing fluoride) is usually required during electroless nickel plating. If the material of the housing 311 is stainless steel, it is applicable to most electroless nickel plating processes, but attention should be paid to avoiding hydrogen embrittlement. If the material of the housing 311 is titanium alloy, due to the strong chemical inertness of titanium, special activation treatment may be required. If the material of the housing 311 is Hastelloy, Hastelloy has good corrosion resistance and is suitable for electroless nickel plating in high-temperature environments

[0070] Anodic oxidation is an electrochemical treatment process mainly used to generate a dense oxide film on the metal surface to improve its corrosion resistance and wear resistance

[0071] Among them, the second anti-corrosion functional layer 3141 is formed on the inner wall surface of the shell 311 in different ways according to the different materials of the shell 311. For example, the aluminum alloy shell 311 generally forms a passivation layer on the inner wall surface of the shell 311 by anodizing. The stainless steel shell 311 generally forms a passivation layer on the inner wall surface of the shell 311 by chemical nickel plating. The titanium alloy shell 311 generally adopts laser cladding titanium nitride coating, and electrochemical passivation treatment is performed on the inner wall surface of the shell 311 to form a passivation layer, thereby further improving the service life of the temperature equalizer 31.

[0072] In this embodiment, by providing a second anti-corrosion functional layer 3141 on the inner wall surface of the shell 311, the inner wall surface of the shell 311 can be protected by the second anti-corrosion functional layer 3141, thereby reducing the risk of chemical reaction between the inner wall surface of the shell 311 and the phase change medium 313. Moreover, a coating is provided on the inner wall surface of the shell 311 to protect the shell 311, which can be applied to shells 311 of various materials, and the coating can be selected according to the needs to have functions such as wear resistance, corrosion resistance, and insulation; and the thickness of the coating can be flexibly adjusted from nanometer level to millimeter level. By performing surface treatment on the inner wall surface of the shell 311 to form a passivation layer to protect the shell 311, the bonding force between the passivation layer and the shell 311 is strong, the passivation layer is not easy to peel off from the shell 311, and the service life is long; and this solution has little effect on the volume of the phase change channel 310, which can effectively ensure the temperature equalization effect of the temperature equalizer 31.

[0073] Understandably, 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 wick 312 is provided with the first anti-corrosion functional layer 3142. Of course, in other embodiments, see Figure 6 , Figure 6 Another embodiment of the present application provides Figure 3 The schematic diagram of the cross-section structure of the temperature equalizing member 31 along the AA direction is shown. The anti-corrosion functional layer 314 may include a second anti-corrosion functional layer 3141, but not a first anti-corrosion functional layer 3142. That is, among the shell 311 and the liquid wick 312, only the inner wall surface of the shell 311 is provided with the second anti-corrosion functional layer 3141. Alternatively, as Figure 4 As shown, the anti-corrosion functional layer 314 may include a first anti-corrosion functional layer 3142, but not a second anti-corrosion functional layer 3141. That is, among the shell 311 and the liquid absorbent core 312, only the outer wall surface of the liquid absorbent core 312 is provided with the first anti-corrosion functional layer 3142.

[0074] In one embodiment, the material of the shell 311 is the same as or similar to the material of the wick 312 .

[0075] Exemplarily, both the housing 311 and the wick 312 are made of stainless steel; alternatively, the housing 311 is made of aluminum alloy and the wick 312 is made of aluminum wire mesh.

[0076] 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.), it can effectively avoid degradation problems caused by electrochemical corrosion or contact between heterogeneous materials, and can effectively reduce the corrosion risk. On the other hand, the same material can ensure that the overall structure has higher stability in high-temperature and high-humidity environments, thereby extending the service life of the temperature equalizing member 31. Moreover, using the same or similar materials can simplify welding, bonding or other connection processes, simplifying the manufacturing process. And 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 the yield. In addition, the wick 312 and the housing 311 made of the same or similar materials can work better together, ensuring the consistency and efficiency of the heat conduction path, and reducing the risk of increased thermal resistance caused by material differences. And this consistency can optimize the overall heat dissipation performance of the temperature equalizing member 31. Moreover, a phase change working fluid 313 with less corrosion can also be selected according to the materials of the housing 311 and the wick 312, reducing the risk that the phase change working fluid 313 has strong corrosion to one of the housing 311 and the wick 312 and relatively weak corrosion to the other.

[0077] In one embodiment, in an acidic environment, the phase change working fluid 313 includes acetone; the material of the housing 311 includes Hastelloy; the material of the wick 312 includes sintered nickel powder. In this way, the temperature equalizing member 31 can also have good anti-corrosion effect under acidic conditions, reducing the risk of failure of the temperature equalizing member 31 and extending the service life of the temperature equalizing member 31.

[0078] Among them, Hastelloy is a type of corrosion-resistant nickel-based superalloy, which has excellent anti-corrosion performance and high-temperature strength. The nickel powder is sintered to form a porous structure of the wick 312, which can generate a strong capillary action, effectively promoting the reflux of the phase change working fluid 313 (such as water or ammonia); and nickel itself has good corrosion resistance, especially excellent in an alkaline environment.

[0079] In other examples, for the corrosion-resistant heat exchange member 20, the phase change working fluid 313 can also be selected as Freon or water.

[0080] In some examples, the heat exchange member 20 can also select a matching phase change working fluid 313 according to the working temperature range it is in, and then match the corresponding materials of the housing 311 and the wick 312 according to different phase change working fluids 313, so as to improve the compatibility between the phase change working fluid 313 and the housing 311 / wick 312, make the heat exchange member 20 applicable to different extreme temperatures and corrosive environments, reduce the risk of corrosion of the heat exchange member 20, and extend the service life of the heat exchange member 20.

[0081] For example, when the heat exchange member 20 is in the low-temperature working temperature range of -50°C to 80°C; as an example, the phase change working fluid 313 can be ammonia (NH3); the material of the corresponding housing 311 can be selected as aluminum alloy; the wick 312 can be selected as aluminum wire mesh. As another example, the phase change working fluid 313 can be Freon; the material of the corresponding housing 311 can be selected as aluminum alloy / or copper; the wick 312 can be selected as aluminum wire mesh / or copper powder sintering. Of course, in other examples, the phase change working fluid 313 can also be Freon, acetone (C3H6O), alcohol or hydrocarbon refrigerant.

[0082] When the heat exchange member 20 is in the medium-temperature working temperature range of 20°C to 200°C; as an example, the phase change working fluid 313 can be deionized water; the material of the corresponding housing 311 can be selected as 304 stainless steel or copper; the wick 312 can be selected as stainless steel wire or copper powder sintering. As another example, the phase change working fluid 313 can be mercury; the material of the corresponding housing 311 can be selected as nickel and its alloys; the wick 312 can be selected as nickel powder sintering. Of course, in other examples, the phase change working fluid 313 can also be Therminol, mercury, cesium or sulfur.

[0083] When the heat exchange member 20 is in the high-temperature working temperature range of 300°C to 800°C; as an example, the phase change working fluid 313 can be sodium-potassium alloy; the material of the corresponding housing 311 can be selected as titanium alloy; the wick 312 can be selected as stainless steel fiber braiding. As another example, the phase change working fluid 313 can be lithium; the material of the corresponding housing 311 can be selected as nickel and its alloys; the wick 312 can be selected as nickel powder sintering. Of course, in other examples, the phase change working fluid 313 can also be sodium, potassium, lithium or silver.

[0084] See Figure 7 , Figure 7 which is a schematic diagram of the distribution of the temperature equalizing member 31 provided in an embodiment of the present application on the heat exchange member 20.

[0085] In one embodiment, the heat exchange member 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 exchange member 20 as the center and a preset 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 equalizing member 31, and the first end of the temperature equalizing member 31 extends to the second central region aa; one ends of the plurality of branch channels 3102 are respectively communicated with the main channel 3101, and the other ends of the plurality of branch channels 3102 respectively extend to the second edge region and respectively serve as a second end of the temperature equalizing member 31.

[0086] In this embodiment, the temperature equalizing member 31 is disposed on the heat exchange member 20 and is in close contact with the temperature equalizing contact surface of the battery assembly 10.

[0087] Among them, when the battery assembly 10 is disposed on the heat exchange member 20, the first central region of the battery assembly 10 is correspondingly disposed with the second central region aa of the heat exchange member 20, and the first edge region of the battery assembly 10 is correspondingly disposed with the second edge region of the heat exchange member 20; and the shapes and sizes of the first central region and the second central region aa can be the same; the shapes and sizes of the first edge region and the second edge region can be the same. Of course, the orthographic projection of the first edge region on the heat exchange member 20 can also be located within the second edge region to ensure that the temperature equalizing member 31 disposed on the heat exchange member 20 at least extends to the first edge region of the battery assembly 10, so as to better achieve the temperature equalizing effect on the battery assembly 10.

[0088] It can be understood that when the battery assembly 10 is disposed on the heat exchange member 20, the temperature equalizing assembly is in contact with the temperature equalizing contact surface of the battery assembly 10, and the first end of the temperature equalizing member 31 also 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, and the second end of the temperature equalizing member 31 at least extends to the first edge region to balance the temperatures of the battery cells 11 in the first central region and the first edge region of the battery assembly 10.

[0089] The heat exchange member 20 has a heat exchange contact surface configured to face the battery assembly 10. The second central region aa and the second edge region of the heat exchange member 20 specifically refer to the second central region aa and the second edge region of the heat exchange contact surface of the heat exchange member 20. Among them, the second central region aa can be a circular region or a polygonal region; the linear distances (i.e., the above-mentioned radius) between the respective sides of the polygonal region and the center of the second central region aa are the same. The polygonal region can be a square region, a triangular region, a hexagonal region, etc.

[0090] Exemplarily, the area of the second central region aa is less than or equal to the sum of the bottom or top areas of four battery cells 11. As an example, the area of the second central region aa may be the same as the sum of the bottom or top areas of one, two, three, or four battery cells 11.

[0091] Each temperature equalizing member 31 has a phase change channel 310 including a main channel 3101 and a plurality of branch channels 3102 respectively communicating with the main channel 3101. One end of the main channel 3101 extends to the second central region aa of the heat exchange member 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 temperature equalizing member 31 includes a first end extending to the second central region aa and a plurality of second ends extending to the second edge region.

[0092] Exemplarily, the heat exchange member 20 has a first center line O along the first direction Y. The temperature equalizing assembly includes four temperature equalizing members 31 symmetrically distributed about the first center line O. Two temperature equalizing members 31 on the same side of the first center line O are spaced apart along a second direction X intersecting the first direction Y. The second direction X may be perpendicular to the first direction Y.

[0093] In this embodiment, the heat of the battery cells 11 in the first central region can be quickly absorbed through the first end of the main channel 3101, and these heats are respectively transferred to a plurality of different edge positions through the plurality of branch channels 3102, thereby equalizing the temperatures of the battery cells 11 in the first central region and the plurality of different edge positions, improving the temperature equalizing effect of the battery assembly 10 and the overall performance of the battery device 200.

[0094] In one embodiment, please continue to refer to Figure 7 , the heat exchange member 20 includes at least one heat exchange channel, and the heat exchange channel includes a plurality of branch flow channels 212. There is at least one branch channel 3102 between two adjacent branch flow channels 212.

[0095] Wherein, the number and corresponding shape of the branch flow channels 212 in each heat exchange channel can be set according to actual situations. For example, the branch flow channels 212 may include, but are not limited to, two, three, four, five, or other quantities, etc. The plurality of branch flow channels 212 may be arranged in a specific pattern or arranged disorderly, etc. The plurality of branch flow channels 212 may communicate with each other, so that the heat exchange fluids in the plurality of branch flow channels 212 can all flow with each other.

[0096] The number of branch channels 3102 of each heat exchange member 20 is multiple, and the multiple branch channels 3102 can be arranged at intervals from each other. It can be that there is at least one branch channel 3102 between some two branch flow channels 212, or there can be one branch channel 3102 between every two branch flow channels 212, or there can be multiple branch channels 3102 arranged at intervals between every two branch flow channels 212.

[0097] Among them, in the manufacturing process of the heat exchange member 20, the lower heat exchange plate 24 (see below Figure 8 ) can be stamped to form a first groove corresponding to the heat exchange channel, and then a heat exchange upper plate 25 (see below Figure 8 ) is covered on one side of the lower heat exchange plate 24 to block the notch of the first groove, so as to obtain the heat exchange member 20 with a heat exchange channel. It can be understood that in this embodiment, the housing 311 of the temperature equalizing member 31 includes a part of the lower heat exchange plate 24 and a part of the upper heat exchange plate 25.

[0098] Of course, in other embodiments, the heat exchange channel can also be arranged on the heat exchange member 20 in other forms. For example, a hose can be embedded on the outer side of the heat exchange member 20 to form a heat exchange channel in the hose, etc. The heat exchange channel can be used for the flow of the heat exchange fluid. The heat exchange fluid can include but is not limited to air flow, cooling water, cooling oil, deionized water, etc. 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 exchange member 20 is provided with a heat exchange channel for the flow of the heat exchange fluid. The multiple battery cells 11 are in contact with the heat exchange member 20, and the heat exchange fluid in the heat exchange channel can be used to cool or heat the multiple battery cells 11, improving the heat exchange efficiency of the battery device 200.

[0099] Among them, the heat exchange member 20 and the temperature equalizing member 31 can be arranged separately or integrally formed.

[0100] When the heat exchange member 20 and the temperature equalizing member 31 are arranged separately, a plurality of branch flow channels 212 can be opened in the heat exchange member 20, and then the temperature equalizing member 31 is fixed on the surface of the heat exchange member 20, and the positive projection of the branch channels 3102 of the temperature equalizing member 31 on the heat exchange member 20 is located between two branch flow channels 212, so that there is at least one branch channel 3102 between the two branch flow channels 212.

[0101] When the heat exchange member 20 and the temperature equalizing member 31 are integrally formed, at least one branch channel 3102 can be processed between every two adjacent branch channels 212. Exemplarily, the heat exchange lower plate 24 can be integrally stamped to form the heat exchange channel and the phase change channel 310. During the manufacturing process, the heat exchange lower 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, and then a heat exchange upper plate 25 is covered on one side of the stamped heat exchange lower plate 24 to simultaneously block the notch of the first groove and the notch of the second groove, obtaining an integral member having the heat exchange channel and the phase change channel 310. The phase change channel 310 and the heat exchange channel are arranged at intervals, so that the phase change channel 310 and the heat exchange channel can act on the battery cell 11 independently of each other. Thus, the heat exchange member 20 and the temperature equalizing member 31 are integrally formed, the heat exchange channel and the phase change channel 310 are spaced apart from each other, improving the production efficiency of the heat exchange member 20 and the temperature equalizing member 31, as well as the assembly efficiency of the battery device 200, etc.

[0102] In this embodiment, by having at least one branch channel 3102 between two heat exchange channels, the heat exchange efficiency and the temperature equalizing efficiency of the battery cell 11 can be improved by reasonably arranging the temperature equalizing assembly and the heat exchange member 20.

[0103] In one embodiment, please continue to refer to Figure 7 , the heat exchange member 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 channel 212 of the heat exchange channel extends along the first direction Y and is arranged at intervals along the second direction X intersecting the first direction Y; the branch channel 3102 located between two adjacent branch channels 212 extends along the first direction Y to the second edge region of the heat exchange member 20.

[0104] Wherein, the heat exchange member 20 is further provided with a fluid inlet 22 and a fluid outlet 23, the fluid inlet 22 and the fluid outlet 23 are respectively communicated with the heat exchange channel, and 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 for the heat exchange fluid to flow into the heat exchange channel, and the fluid outlet 23 can be used for the heat exchange fluid to flow out of the heat exchange channel.

[0105] The two heat exchange regions bb are distributed on both sides of the first center line O. Exemplarily, each heat exchange region bb includes a heat exchange channel, and the heat exchange channel includes a main inlet channel 211, a plurality of branch channels 212 and a main outlet channel 213. The plurality of branch channels 212 are respectively communicated with the fluid inlet 22 through the main inlet channel 211, and the plurality of branch channels 212 are respectively communicated with the fluid outlet 23 through the main outlet channel 213. Wherein, the main inlet channel 211 and the main outlet channel 213 can extend along the second direction X. The length dimensions of the respective branch channels 212 along the first direction Y can be the same or different, or partially the same and partially different.

[0106] In this embodiment, by arranging two heat exchange regions bb spaced apart in 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 the multiple battery cells 11 and improving the overall performance of the battery device 200. Moreover, by reasonably arranging the branch channels 3102 and the branch flow channels 212, the heat exchange efficiency and the temperature equalization efficiency for the battery cells 11 can be further improved. Additionally, by extending the branch flow channels 212 and the branch channels 3102 along the first direction Y respectively, the risk of interference between the branch flow channels 212 and the branch channels 3102 can be reduced, and the extended path of the branch channels 3102 can be shortened, thereby further improving the temperature equalization efficiency.

[0107] See Figure 8 , Figure 8 a schematic cross-sectional structure diagram along the B-B direction of the structure provided in an embodiment of the present application Figure 7 shown in

[0108] In one embodiment, micro-grooves 315 are provided on the bottom wall of the phase change channel 310, the wick 312 covers the micro-grooves 315, and at least a part of the micro-grooves 315 extends along the first direction Y; wherein, at least two battery cells 11 are arranged in the first direction Y, and each branch channel 3102 is in contact with at least two battery cells 11 arranged in the first direction Y.

[0109] The micro-grooves 315 can be in a V-shaped structure, the number of the micro-grooves 315 can be multiple, and the multiple micro-grooves 315 can be spaced apart from each other in a direction perpendicular to the first direction Y. Of course, the micro-grooves 315 can also be in a semi-circular or arc-shaped structure.

[0110] In this embodiment, by providing the micro-grooves 315 and making the micro-grooves 315 extend along the first direction Y, the liquid phase change working fluid 313 that is not absorbed by the wick 312 can flow along the first direction Y through the micro-grooves 315, making it easier for the liquid phase change working fluid 313 to act on the battery cells 11 arranged in the first direction Y, further improving the temperature equalization efficiency for the battery cells 11, reducing the temperature difference between the multiple battery cells 11, and improving the overall performance of the battery device 200. Additionally, by making each branch channel 3102 in contact with at least two battery cells 11 arranged in the first direction Y, temperature equalization can be performed on each of the battery cells 11 arranged in the first direction Y that is in contact with the branch channel 3102 through the branch channel 3102, and the temperature equalization efficiency can be improved through the micro-grooves 315.

[0111] See Figure 9 , Figure 9 a schematic cross-sectional structure diagram along the B-B direction of the structure provided in another embodiment of the present application Figure 7 shown in

[0112] In one embodiment, the temperature-averaging member 31 further includes a beam-shaped strip 316 , which is disposed in the phase change channel 310 and sandwiched between the liquid-absorbing core 312 and the top wall of the shell 311 .

[0113] The beam strip 316 can be extended along the first direction Y, and the beam strip 316 is used to limit the excessive deformation of the liquid absorbent core 312. When the temperature-averaging component 31 and the heat exchange component 20 are integrally formed, the beam strip 316 is sandwiched between the liquid absorbent core 312 and the heat exchange upper plate 25. During the manufacturing process, a groove can be punched on the heat exchange lower plate 24, and then the liquid absorbent core 312 is installed in the groove, and the beam strip 316 is installed on the side of the liquid absorbent core 312 away from the bottom wall of the groove. Finally, the heat exchange upper plate 25 is pressed on the side of the beam strip 316 away from the liquid absorbent core 312 and the notch of the groove is blocked to form a temperature-averaging component.

[0114] The dimension of the tie strip 316 along the second direction X may be the same as or slightly smaller than the dimension of the absorbent core 312 along the second direction X.

[0115] In this embodiment, the tie bar 316 is sandwiched between the wick 312 and the top wall of the temperature equalizer 31, and the tie bar 316 can limit the excessive deformation of the wick 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 wick 312.

[0116] See also Figure 10 , Figure 10 Another embodiment of the present application provides Figure 7 The structure shown is a schematic cross-sectional view along the BB direction.

[0117] In one embodiment, the portion of the phase change channel 310 not filled with the wick 312 serves as a redundant space 317 . The wick 312 is disposed in contact with the inner wall of the shell 311 . The wick 312 encloses the redundant space 317 . The phase change medium 313 is located in the redundant space 317 .

[0118] The extension direction of the wick 312 and the redundant space 317 is the same as the extension direction of the phase change channel 310, that is, the wick 312 and the redundant space 317 located in the main channel 3101 extend along the extension direction of the main channel 3101. The wick 312 and the redundant space 317 located in the branch channel 3102 extend along the first direction Y.

[0119] The absorbent core 312 may be in the shape of a U-shaped letter "U", and the specific shape and thickness of the absorbent core 312 may be set according to the specific structure and required size of the phase change channel 310 .

[0120] In this embodiment, by arranging the liquid absorption core 312 to be attached to the inner side wall of the phase change channel 310, and arranging the liquid absorption core 312 around the redundant space 317, it is easier for the vaporized liquid phase change working medium 313 to smoothly enter the redundant space 317, and for the liquefied gaseous phase change working medium 313 to be absorbed by the liquid absorption core 312, improving the stability of the liquid absorption core 312 in the phase change channel 310 and alleviating the risk of the temperature equalization efficiency deteriorating due to the deformation of the liquid absorption core 312. At the same time, the risk of the phase change working medium 313 contacting the housing 311, resulting in a chemical reaction between the phase change working medium 313 and the housing 311 and causing the temperature equalization component 31 to fail, can also be further reduced.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: A battery assembly including 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 member, on which the battery assembly is disposed; A temperature equalizing assembly including a plurality of temperature equalizing members, the temperature equalizing members being in contact with at least two of the battery cells; the temperature equalizing members have a first end and a second end, the first end of the temperature equalizing member extends to the first central region, and the second end of the temperature equalizing member extends to the first edge region; the temperature equalizing member includes a housing, a wick, a phase change working fluid, and an anti-corrosion functional layer, the housing has a phase change channel; the wick and the phase change working fluid are disposed in the phase change channel; the anti-corrosion functional layer includes a first anti-corrosion functional layer, and the first anti-corrosion functional layer is disposed on the outer wall surface of the wick; the first anti-corrosion functional layer includes a surface structure layer formed by subjecting the outer wall surface of the wick to hydrophobic and / or hydrophilic treatment.

2. The battery device according to claim 1, wherein The anti-corrosion functional layer includes a second anti-corrosion functional layer, and the second anti-corrosion functional layer is 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.

3. The battery device according to claim 1, wherein The material of the housing 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 fluid includes acetone; the material of the housing includes Hastelloy; the material of the wick includes sintered nickel powder.

5. The battery device according to any one of claims 1-4, wherein The heat exchange member 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 exchange member as the center and a preset length as the radius; The phase change channel includes a main channel and a plurality of branch channels, one end of the main channel serves as the first end of the temperature equalizing member, and the first end of the temperature equalizing member extends to the second central region; one ends of the plurality of branch channels are respectively communicated with the main channel, and the other ends of the plurality of branch channels respectively extend to the second edge region and respectively serve as a second end of the temperature equalizing member.

6. The battery device according to claim 5, wherein The heat exchange member includes at least one heat exchange channel, and the heat exchange channel includes a plurality of branch flow channels; there is at least one of the branch channels between adjacent two of the branch flow channels.

7. The battery device according to claim 6, wherein The heat exchange member is divided into two heat exchange regions along a first direction; each of the heat exchange regions includes at least one of the heat exchange channels, and the branch flow channels of the heat exchange channel extend along the first direction and are spaced apart along a second direction intersecting the first direction; the branch channels located between adjacent two of the branch flow channels extend along the first direction to the second edge region of the heat exchange member.

8. The battery device according to claim 5, wherein a micro-groove is provided on the bottom wall of the phase change channel, the wick covers the micro-groove, and at least a part of the micro-groove extends along a first direction; wherein, at least two of the battery monomers are arranged in the first direction, and each of the branch channels is in contact with at least two of the battery monomers arranged along the first direction.

9. The battery device according to any one of claims 1-4, wherein the temperature equalizing member further includes a beam-shaped strip, the beam-shaped strip is disposed in the phase change channel and is clamped between the wick and the top wall of the housing.

10. The battery device according to any one of claims 1-4, wherein a part of the phase change channel not filled with the wick serves as a redundant space, the wick is attached to the inner side wall of the housing, the wick encloses to form the redundant space, and the phase change working fluid is located in the redundant space.

11. An electrical device, characterized in that, Comprising the battery device according to any one of claims 1-10.

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