Battery device, energy storage device and power utilization device

Abstract

The utility model discloses a battery device, an energy storage device and a power utilization device.The battery device comprises a battery monomer and a box body, the box body comprises a frame and a sealing cover plate, the frame is provided with an opening, the sealing cover plate is connected with the frame to seal the opening to form a containing cavity, the battery monomer is contained in the containing cavity, and the sealing cover plate is attached to the battery monomer; the side, deviating from the battery monomers, of the sealing cover plate is located in the external environment of the box body, a sealing cavity is formed in the sealing cover plate, and the sealing cavity is filled with a phase change working medium. According to the scheme, the leakage risk caused by the liquid cooling technology can be reduced while the efficient heat dissipation capability is reserved, and the system complexity is reduced, so that the cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device, an energy storage device and an electric device. BACKGROUND

[0002] At present, from the development of market situation, the application of battery device is more and more widely. The battery device is not only applied to the energy storage power system of water power, fire power, wind power and solar power station, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles and electric transportation tools, military equipment and aerospace and other fields. With the continuous expansion of the application field of battery device, the demand of its market is also increasing.

[0003] In the use process of the battery device, the battery monomer will generate heat to cause temperature rise. At present, the cooling of battery monomer mainly adopts liquid cooling technology, but the liquid cooling technology system is complex, the cost is high, the maintenance is more complicated, and the risk of leakage always exists. Therefore, a new type of battery thermal management scheme is needed, which can reduce the leakage risk brought by liquid cooling technology while retaining high efficient heat dissipation capacity, and reduce the system complexity to reduce the cost. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide a battery device, an energy storage device and an electric device, so as to reduce the sealing leakage risk brought by liquid cooling technology, and reduce the system complexity to reduce the cost.

[0005] To achieve the above purpose, the first technical scheme provided by the present application is:

[0006] A battery device, comprising a battery monomer and a box body; the box body comprises a frame and a cover plate, the frame is provided with an opening, the cover plate is connected with the frame to block the opening to form a containing cavity, the battery monomer is contained in the containing cavity, the cover plate abuts against the battery monomer, the side of the cover plate away from the battery monomer is located in the external environment of the box body, the inside of the cover plate is provided with a sealed cavity, and the sealed cavity is filled with phase change working medium.

[0007] The battery device provided by the application comprises a box body, the box body comprises a frame and a cover plate, an accommodating cavity is formed by blocking the opening of the frame through the cover plate, the battery monomer can be isolated from the external environment, the cover plate simultaneously serves as a cover part and a heat dissipation part of the box body, a sealed cavity is arranged in the cover plate, the sealed cavity is filled with phase change working medium, when the temperature of the battery monomer abutting against the cover plate rises, the heat of the battery monomer is transferred to one side of the cover plate abutting against the battery monomer, and then is transferred to the phase change working medium in the sealed cavity in the cover plate, so that the phase change working medium evaporates, the steam formed by evaporation fills the sealed cavity and moves randomly in the sealed cavity, when the steam moves to the side of the cover plate away from the battery monomer, the heat of the steam is transferred to the side of the cover plate away from the battery monomer and then is dissipated to the air, the steam is condensed and liquefied due to the temperature reduction, and then flows back to the side of the cover plate abutting against the battery monomer, so that the heat dissipation of the battery device is realized through the above-mentioned circulation, the heat transfer of the battery device is realized through the phase change of the phase change working medium in the cover plate, the passive heat dissipation scheme of realizing the heat dissipation of the battery device through the phase change cycle of the phase change working medium is used to replace the traditional liquid cooling cycle scheme, the structure of the heat dissipation system of the battery device is simplified, the leakage risk and the maintenance cost are significantly reduced, the phase change of the phase change working medium in the cover plate is used to realize the rapid heat diffusion, the heat distribution is more uniform, and the local overheating risk can be reduced.

[0008] In some embodiments, the inner surface of the sealed cavity is provided with microgrooves.

[0009] The microgrooves can increase the area of the inner surface of the sealed cavity, thereby effectively increasing the contact area of the phase change working medium and the inner surface of the sealed cavity, promoting the circulation efficiency of the vapor-liquid phase change in the phase change process, and further improving the heat dissipation efficiency.

[0010] In some embodiments, the sealed cavity comprises a plurality of closed sub-cavities.

[0011] The sealed cavity is composed of a plurality of sub-cavities, each sub-cavity can constitute an independent heat exchange unit, the rapid condensation of the phase change working medium after vaporization can be realized for the local overheating condition, so that the rapid heat diffusion is achieved, and the structure of the plurality of closed sub-cavities can also facilitate the partitioned thermal management of the battery device.

[0012] In some embodiments, the cover plate comprises a plate body and two end plates, a plurality of isolation parts are arranged in the plate body, the plate body defines a plurality of sub-cavities through the plurality of isolation parts, the plurality of sub-cavities respectively extend through the plate body along a first direction, and the plurality of sub-cavities are sequentially and spacedly arranged along a second direction, wherein the first direction and the second direction intersect and respectively intersect with the thickness direction of the cover plate; the two end plates are respectively arranged at the two ends of the plate body along the first direction to close the plurality of sub-cavities.

[0013] The combination of the plate body and the end plate realizes the closure of the sub-cavities. Each sub-cavity is a cavity structure penetrating through the plate body. Therefore, the plate body can be manufactured by an extrusion forming process to form the sub-cavities inside the plate body. Then, the two end plates are capped on the two ends of the plate body to form a closed space for the sub-cavities. The capping plate has this structure, which is beneficial to the molding of the closed sub-cavities, and the manufacturing process is simpler, and the manufacturing and molding can be realized at a low cost.

[0014] In some embodiments, the end portion of the isolation portion is provided with a gap in the first direction, and adjacent sub-cavities are communicated via the gap. The end plate is provided with a liquid injection port communicated with at least one sub-cavity.

[0015] The end portion of the isolation portion is provided with a gap, which forms a communication channel between adjacent sub-cavities. The liquid injection port provided on the end plate maintains a communication relationship with at least one sub-cavity. Therefore, after the end plate is capped on the plate body, the phase change working medium can be injected into the sub-cavity through the liquid injection port. The phase change working medium can be filled into each sub-cavity through the communication of each isolation portion. The filling process of the phase change working medium is simplified.

[0016] In some embodiments, the capping plate includes a first stamping plate and a second stamping plate arranged along the thickness direction thereof. The first stamping plate and the second stamping plate are connected and jointly enclosed to form a sealed cavity. The structure and arrangement of the sealed cavity can be more flexible.

[0017] In some embodiments, the phase change working medium fills part of the sealed cavity, and the volume of the phase change working medium is 30% to 70% of the total volume of the sealed cavity.

[0018] The phase change working medium only fills part of the sealed cavity, but does not completely fill the sealed cavity. The space in the sealed cavity that is not filled with the phase change working medium provides an expansion space for the vapor generated by the phase change, allowing it to expand. This effectively buffers the sharp rise in pressure in the sealed cavity, maintains the internal pressure of the capping plate within the designed safety range, and improves the operation reliability and stability of the battery device. The filling range of 30% to 70% not only improves the sustainability of the phase change cycle, but also reduces the stress of the phase change working medium on the structure of the sealed cavity.

[0019] In some embodiments, the inner surface of the sealed cavity is provided with a heat conduction layer, and the heat conduction layer covers the micro-grooves. The heat conduction layer is used to enhance the heat conduction performance between the capping plate and the phase change working medium, and reduce the thermal resistance.

[0020] In some embodiments, the inner surface of the sealed cavity is provided with a corrosion-resistant layer, and the corrosion-resistant layer covers the heat conduction layer. The core function of the heat conduction layer is to conduct heat from the capping plate to the phase change working medium. The core function of the corrosion-resistant layer is to resist the corrosion of the phase change working medium to the capping plate. Covering the corrosion-resistant layer on the heat conduction layer is equivalent to providing protection for the heat conduction layer, which isolates the heat conduction layer from the phase change working medium, thereby improving the long-term stability of the heat conduction layer.

[0021] In some embodiments, a plurality of layers of mesh frameworks are arranged in the sealed cavity, and the plurality of layers of mesh frameworks form capillary flow channels for the phase change working medium.

[0022] The capillary flow channels formed by the plurality of layers of mesh frameworks can significantly improve the circulation efficiency of the phase change working medium in the sealed cavity, and make the heat evenly and rapidly spread in the sealed cavity.

[0023] In some embodiments, the cover plate includes a body and a heat dissipation fin, the sealed cavity is arranged in the body, the body is arranged against the battery monomer, and the heat dissipation fin is arranged on a side of the body away from the battery monomer.

[0024] The heat dissipation fin can increase the contact area with air, that is, increase the heat dissipation area of the cover plate. After the heat of the battery monomer is transferred to the side of the cover plate away from the heat dissipation fin, the phase change working medium in the cover plate absorbs the heat and vaporizes, the steam moves towards the side of the heat dissipation fin, the heat is transferred to the heat dissipation fin, and then the heat is dissipated. Through the arrangement of the heat dissipation fin, the heat dissipation capacity of the cover plate is improved.

[0025] In some embodiments, the cover plate is arranged against the side of the battery monomer away from the electrode terminal.

[0026] The cover plate directly contacts the non-electrode terminal side of the battery monomer, which increases the contact area of the cover plate and the battery monomer and improves the heat dissipation capacity of the cover plate for the battery monomer.

[0027] In some embodiments, the phase change working medium includes a composite refrigerant, the composite refrigerant includes a phase change refrigerant and a phase change temperature regulator, the volume proportion of the phase change refrigerant is greater than the volume proportion of the phase change temperature regulator, and the evaporation temperature of the phase change refrigerant is lower than the phase change temperature of the composite refrigerant.

[0028] The phase change working medium adopts the composite refrigerant. In the composite refrigerant, the refrigerant usually has strong heat absorption capacity, and the addition of the phase change temperature regulator can change the phase change temperature of the composite refrigerant. Through the volume ratio control of the phase change refrigerant and the phase change temperature regulator, more efficient heat absorption and temperature regulation can be achieved, so that the composite refrigerant can adapt to the working temperature requirement of the battery device.

[0029] In some embodiments, the phase change temperature of the composite refrigerant is between 45℃ and 55℃.

[0030] By setting the phase change temperature of the composite refrigerant to be between 45℃ and 55℃, a more accurate match with the working temperature range of the battery device can be formed. When the temperature of the battery monomer exceeds 45℃, the composite refrigerant immediately starts the vaporization phase change heat absorption mechanism, effectively inhibits the local overheating phenomenon, and realizes rapid heat dissipation of the battery monomer. At the same time, the temperature difference of each battery monomer can be controlled within a preset temperature difference range.

[0031] To achieve the above object, the second technical solution provided by the present application is: an energy storage device comprising the battery device of any of the above solutions.

[0032] The energy storage device provided by the present application has the same beneficial effects as the battery device, which will not be repeated here.

[0033] To achieve the above object, the third technical solution provided by the present application is: an electric device comprising the battery device of any of the above solutions.

[0034] The electric device provided by the present application has the same beneficial effects as the battery device, which will not be repeated here.

[0035] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will describe the specific embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings, wherein:

[0037] Figure 1 is a structural schematic diagram of the energy storage device provided by one or more embodiments of the present application;

[0038] Figure 2 is a structural schematic diagram of the vehicle provided by one or more embodiments of the present application;

[0039] Figure 3 is a perspective structural schematic diagram of the battery device provided by one or more embodiments of the present application;

[0040] Figure 4 is a plan structural schematic diagram of the battery device of Figure 3 ;

[0041] Figure 5 is a cross-sectional schematic diagram of A-A in Figure 4 ;

[0042] Figure 6 is a partial enlarged view of Figure 5 ;

[0043] Figure 7 is a partial sectional view of the cover plate in the battery device provided by one or more embodiments of the present application;

[0044] Figure 8 is a split structure plane schematic diagram of a cover plate in a battery device provided by one or more embodiments of the present application;

[0045] Figure 9 is a partial cross-sectional schematic diagram of a cover plate in a battery device provided by one or more embodiments of the present application;

[0046] Figure 10 is a partial cross-sectional schematic diagram of a cover plate in a battery device provided by one or more embodiments of the present application.

[0047] Legend of reference signs:

[0048] 1000, energy storage device; 200, cabinet body;

[0049] 2000, vehicle; 300, controller; 400, motor;

[0050] 100, battery device;

[0051] 10, battery cell; 101, electrode terminal;

[0052] 20, cabinet; 201, containing cavity; 21, frame; 210, opening; 22, cover plate; 220, sealed cavity; 2200, micro groove; 2201, heat conduction layer; 2202, corrosion prevention layer; 221, sub-cavity; 222, plate body; 2220, isolation part; 2221, notch; 223, end plate; 2230, liquid injection port; 2231, plug; 224, heat dissipation fin; 225, body; x1, first direction; x2, second direction. DETAILED DESCRIPTION

[0053] The embodiments of the technical solutions of the present application will be described in detail below in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0054] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0056] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0058] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0059] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0060] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing", and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0061] The term "parallel" in the present application includes not only the case of absolute parallel, but also the case of approximate parallel which is generally recognized in engineering. Meanwhile, the term "perpendicular" also includes not only the case of absolute perpendicular, but also the case of approximate perpendicular which is generally recognized in engineering. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0062] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0063] In the use process of the battery device, the battery monomer in the battery device will generate heat, and if the heat is too high, it will have an adverse effect on the performance and service life of the battery device. At present, for the battery device with high power density and energy density, the liquid cooling technology has become the mainstream of active cooling scheme. This technology uses cooling liquid as the cooling medium, and the cooling liquid can use glycol-water mixture. The pump provides power to drive the cooling liquid to circulate in the entire closed loop system. The cooling liquid flowing through the internal flow channel of the liquid cooling plate carries away the heat generated by the battery, and finally dissipates the heat to the external environment through the external radiator (such as condenser). The liquid cooling technology needs to use water pump, radiator, and many precise components such as pipelines and joints to form a closed loop system for the circulation of cooling liquid, which relies on a complex pipeline network. The system is complex, has many components, high cost, and maintenance is relatively cumbersome, and the risk of liquid leakage always exists.

[0064] Based on the above considerations, in order to reduce the sealing leakage risk brought by the liquid cooling technology, and to reduce the complexity of the system and thus reduce the cost, the first aspect of the present application provides a battery device, which comprises a battery monomer and a box body. The box body comprises a frame and a cover plate. The frame is provided with an opening, and the cover plate is connected with the frame to block the opening to form a containing cavity. The battery monomer is contained in the containing cavity, and the cover plate abuts against the battery monomer. The side of the cover plate away from the battery monomer is located in the external environment of the box body. The cover plate is internally provided with a sealed cavity, and the sealed cavity is filled with a phase change working medium.

[0065] The battery device provided in the application comprises a frame and a cover plate. The cover plate seals the opening of the frame to form a containing cavity, so that the battery monomer can be isolated from the external environment. The cover plate serves as a sealing component of the battery device and also as a heat dissipation component. A sealed cavity is arranged inside the cover plate and filled with phase change working medium. When the temperature of the battery monomer increases, the heat of the battery monomer is transferred to one side of the cover plate that is in contact with the battery monomer, and then to the phase change working medium in the sealed cavity inside the cover plate. The phase change working medium absorbs heat and evaporates. The vapor formed by evaporation fills the sealed cavity and moves randomly in the sealed cavity. When the vapor moves to the side of the cover plate that is away from the battery monomer, the vapor condenses and liquefies due to the cold. The heat of the vapor is transferred to the side of the cover plate that is away from the battery monomer and then dissipated to the air. The liquid phase change working medium formed by the condensation of the vapor returns to the side of the cover plate that is in contact with the battery monomer, and the process is repeated to achieve heat dissipation of the battery device. The battery device of the application uses the phase change of the phase change working medium inside the cover plate for heat transfer. The passive heat dissipation scheme of the battery device, which is achieved by the phase change cycle of the phase change working medium, replaces the traditional liquid cooling cycle scheme. The structure of the heat dissipation system of the battery device is simplified, the risk of leakage and maintenance cost are significantly reduced, and the phase change of the phase change working medium inside the cover plate is used to achieve rapid heat diffusion and more uniform heat distribution, thereby reducing the risk of local overheating.

[0066] Compared with the traditional liquid cooling cycle scheme, the battery device of the application achieves heat dissipation through the phase change of the phase change working medium inside the cover plate. The water pump, pipeline and other moving parts in the traditional liquid cooling cycle system are eliminated, thereby significantly reducing the risk of leakage and maintenance cost.

[0067] The battery device of the application can be used in energy storage devices, electric devices and the like. The power supply system of the energy storage device can be composed of the battery device of the application. The power supply system of the electric device can also be composed of the battery device of the application.

[0068] The energy storage device using the battery device as a power supply system in the embodiments of the application can be used in energy storage power stations, wind power systems, solar power systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at appropriate times. For example, the energy storage device can store electrical energy during the low electricity consumption period and provide electrical energy for related users or electric devices during the peak electricity consumption period. The energy storage device provided in the embodiments of the application can be any power system that needs to use an energy storage device.

[0069] The power consumption device using the battery device as a power source in the embodiments of the present application can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0070] The following embodiments are described by taking a kind of energy storage device in an embodiment of the present application as an example for convenience of description. Figure 1 , Figure 1 The structural schematic diagram of the energy storage device provided in one or more embodiments of the present application is shown. The energy storage device 1000 includes a cabinet 200 and one or more battery clusters, which are accommodated in the cabinet 200. The battery cluster can include a plurality of battery devices 100, which are connected in series through a busbar component to increase the voltage of the energy storage device 1000. When the energy storage device 1000 includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device 1000.

[0071] In some embodiments, the energy storage device 1000 is an energy storage container or an energy storage cabinet, and the battery device 100 applied to the energy storage device can also be referred to as an energy storage battery.

[0072] In addition, the battery device 100 provided in the embodiments of the present application is also applicable to a power consumption device. For the sake of brevity of description, the following embodiments are described by taking a vehicle as an example. Please refer to Figure 2 , Figure 2 The structural schematic diagram of the vehicle 2000 of one or more embodiments of the present application is shown schematically. The vehicle 2000 can be a fuel car, a gas car or a new energy car, which can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle 2000 is internally provided with a battery device 100, which can be arranged at the bottom, the head or the tail of the vehicle 2000. The battery device 100 can be used for power supply of the vehicle 2000, for example, the battery device 100 can be used as an operating power source of the vehicle 2000. The vehicle 2000 can further include a controller 300 and a motor 400, the controller 300 is used to control the battery device 100 to supply power to the motor 400, for example, to meet the power demand of the vehicle 2000 during starting, navigation and driving, and the battery device 100 applied to the power consumption device such as the vehicle 2000 can also be referred to as a power battery.

[0073] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 2000, but also be used as a driving power source of the vehicle 2000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 2000.

[0074] The battery device provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0075] Please refer to Figures 3 to 6 , Figure 3 is a perspective structural schematic diagram of the battery device 100 provided by one or more embodiments of the present application, Figure 4 is a planar structural schematic diagram of the battery device 100 of Figure 3 , Figure 5 is a schematic diagram of the A-A cross section in Figure 4 , Figure 6 is a partial enlarged view of Figure 5 . According to some embodiments of the present application, the present application provides a battery device 100, which comprises a battery monomer 10 and a box body 20, the box body 20 comprises a frame 21 and a cover plate 22, the frame 21 is provided with an opening 210, the cover plate 22 is connected with the frame 21 to block the opening 210 to form a containing cavity 201, the battery monomer 10 is contained in the containing cavity 201, the cover plate 22 abuts against the battery monomer 10, the side of the cover plate 22 away from the battery monomer 10 is located in the external environment of the box body 20, and the inside of the cover plate 22 is provided with a sealed cavity 220, which is filled with a phase change working medium.

[0076] Among them, the battery monomer 10 refers to the smallest unit that constitutes the battery device 100. In the battery device 100, the battery monomer 10 can be multiple, and the multiple battery monomers 10 can be connected in series or in parallel or in mixed connection, and the mixed connection means that there are both series connection and parallel connection among the multiple battery monomers 10. The multiple battery monomers 10 can be directly connected in series or in parallel or in mixed connection together, and then the whole composed of the multiple battery monomers 10 is contained in the box body 20; of course, the battery device 100 can also be that the multiple battery monomers 10 are first connected in series or in parallel or in mixed connection to form a battery module, and multiple battery modules are connected in series or in parallel or in mixed connection to form a whole, and are contained in the box body 20. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current combing component for realizing the electrical connection between the multiple battery monomers 10.

[0077] The manufacturing method of the battery monomer 10 includes the laminated type and the winding type, that is, the battery monomer 10 is divided into two types of laminated battery and winding battery. The laminated battery has uniform current collection effect, smaller battery internal resistance, and larger specific power, but in order to improve the precision, the mold precision requirement is extremely high, the equipment investment is high, and the process is relatively complex, and the production efficiency is low. The winding battery is simple to manufacture, the equipment precision requirement in the manufacturing and assembling process is general, the production efficiency is high, and the cost is relatively low. In terms of performance, the winding battery has excellent high and low temperature performance, very fast charging, super long life, stable high output voltage, and strong structure and shock resistance.

[0078] The battery cell 10 can be a secondary battery, which refers to a battery cell 10 that can be activated by charging after discharging. The battery cell 10 can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto. As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell 10 of other shapes, including a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0079] The battery cell 10 can include a housing, an electrode assembly, and other functional components, the housing including a cap and a case.

[0080] The cap refers to a component that covers the opening of the case to isolate the internal environment of the battery cell 10 from the external environment of the battery cell 10. The external environment of the battery cell 10 can refer to the environmental space outside the housing of the battery cell 10. The shape of the cap can be adapted to the shape of the case to fit the case. Alternatively, the cap can be made of a material with certain hardness and strength, such as aluminum alloy, so that the cap is not easily deformed when subjected to extrusion and impact, allowing the battery cell 10 to have higher structural strength and improved safety performance. The cap can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly for output or input of the electrical energy of the battery cell 10. In some embodiments, the electrode terminals can include a pole. The pole can include a positive pole and a negative pole for output of current and connection with external circuits. In some embodiments, the cap can also be provided with a pressure relief device for relieving internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. The material of the cap can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member can also be provided on the inner side of the cap, which can be used to isolate the electrical connection components in the case from the cap to reduce the risk of short circuit. The insulating member can be plastic, rubber, etc.

[0081] The shell is a component for fitting the end cap to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell and end cap can be independent components, and an opening can be provided on the shell, and the end cap is fitted to cover the opening to form the internal environment of the battery cell 10. Without limitation, the end cap and the shell can also be integrated, specifically, the end cap and the shell can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell, the end cap is fitted to cover the shell. The shell can be various shapes and various sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell can be determined according to the specific shape and size of the electrode assembly. The material of the shell can be various, such as the material of the shell including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0082] The electrode assembly is a component where electrochemical reactions occur in the battery cell 10. One or more electrode assemblies can be contained in the shell. The electrode assembly is mainly formed by winding or stacking the positive and negative electrode sheets, and an insulating member is usually provided between the positive and negative electrode sheets. The positive and negative electrode sheets have a portion of active material constituting the main body of the electrode assembly, and a portion of the positive and negative electrode sheets without active material each constitutes a tab. The positive and negative tabs can be located together at one end of the main body or at two ends of the main body, respectively. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0083] In some embodiments, the electrode assembly includes a positive electrode, a negative electrode, and an insulating member. During the charging and discharging process of the battery cell 10, active ions (such as lithium ions) are embedded and extracted between the positive and negative electrodes. The insulating member is provided between the positive and negative electrodes, which can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0084] In some embodiments, the battery cell 10 further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state or a solid state.

[0085] The box 20 is a component for packaging the battery cell 10, which functions to protect the battery cell 10 and reduce the influence of liquid or other foreign matter on the charging or discharging of the battery cell 10. The box 20 can adopt various structures, and the box 20 can be a simple solid structure such as a cuboid or a cylinder or a sphere, or a complex solid structure composed of a cuboid or a cylinder or a sphere. The material of the box 20 can be an alloy material such as an aluminum alloy or an iron alloy, or a high polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin.

[0086] The box 20 comprises a frame 21 and a cover plate 22, the frame 21 is provided with an opening 210 through which the battery cell 10 can be encapsulated into the box 20, the cover plate 22 is connected to the frame 21 and seals the opening 210, so that the battery cell 10 is sealed and encapsulated in the box 20, the frame 21 and the cover plate 22 jointly constitute a plurality of walls of the box 20, thereby constituting the overall structure of the box 20. In some specific embodiments, the frame 21 is provided with an opening 210 on both sides in the axial direction X of the box 20, and generally, the cover plate 22 has two, and the two cover plates 22 are respectively covered on both ends of the frame 21 to respectively close the two openings 210 of the frame 21, so that the frame 21 and the two cover plates 22 jointly form a closed box 20, therefore, the cover plate 22 of the embodiment of the present application refers to one of the walls in the axial direction X of the box 20, and the thickness direction of the cover plate 22 is the axial direction X of the box 20. Among them, the two cover plates 22 of the box 20 can also be called the cover plate and the bottom plate of the box 20, the box 20 has opposite top and bottom in the axial direction X, the cover plate is arranged on the top of the box 20, and the bottom plate is arranged on the bottom of the box 20, the cover plate is generally arranged on the side of the electrode terminal 101 of the battery cell 10, and the bottom plate is generally arranged away from the side of the electrode terminal of the battery cell 10, when the battery device 100 is installed to the energy storage device or the power consumption device, the battery device is generally installed in an inverted manner, that is, the cover plate is downward and the bottom plate is upward, the present application also does not exclude the installation in a normal manner, that is, the cover plate is upward and the bottom plate is downward.

[0087] The frame 21 extends along the circumferential direction of the box 20, and the frame 21 of the box 20 is part of the box 20 in the axial direction X of the box 20, and the frame 21 mainly plays a supporting role in the axial direction X of the box 20, and the frame 21 can be a ring-shaped frame structure, for example, a ring-shaped frame 21 with an outer shape similar to a rectangle, and a receiving cavity 201 for accommodating the battery cell 10 is formed in the center of the ring-shaped frame 21.

[0088] The cover plate 22 serves as a wall of the box 20 along the axial direction X, and is used to cover the frame 21 and abut against the battery cell 10 in the box 20 to exchange heat with the battery cell 10, thereby achieving heat dissipation of the battery cell 10, reducing the heat generated by the battery cell 10 during use of the battery device 100, and slowing down the adverse effects of excessive heat of the battery cell 10 on the performance and service life of the battery device 100. In order to increase the contact area of the cover plate 22 and the battery cell 10, thereby improving the heat dissipation effect of the battery cell 10, the cover plate 22 can be arranged to abut against the side of the battery cell 10 away from the electrode terminal, in other words, the cover plate 22 is used as the bottom plate of the box 20 itself. The side of the cover plate 22 away from the battery cell 10 is located in the external environment of the box 20, and it should be noted that the external environment of the box 20 refers to the environmental space outside the box 20, and the cooperation of the cover plate 22 and the frame 21 can isolate the battery cell 10 in the box 20 from the external environment of the box 20.

[0089] The cover plate 22 is a hollow structure, and the sealed cavity 220 inside the cover plate 22 is used to fill the phase change working medium. The phase change working medium refers to a working medium that can change phase under temperature conditions. For example, the phase change working medium can be a refrigerant or a composite refrigerant doped with an additive. Specifically, the cover plate 22 has a first surface and a second surface opposite to each other in the thickness direction of the cover plate 22. The first surface and the second surface are respectively located on opposite sides of the sealed cavity 220. The first surface abuts against the battery cell 10, and the cover plate 22 exchanges heat with the battery cell 10 through the first surface. The second surface forms part of the outer surface of the box 20, and the heat of the cover plate 22 is dissipated to the outside of the box 20 through the second surface. The phase change of the phase change working medium inside the cover plate 22 can achieve heat transfer from the first surface to the second surface of the cover plate 22.

[0090] Because the temperature of the cover plate 22 is not the same everywhere, when the battery cell 10 is working, the battery cell 10 generates heat, causing the temperature of the area abutting against the battery cell 10 to be relatively high, and the temperature of the area away from the battery cell 10 to be relatively low. When the temperature of the battery cell 10 rises, the heat of the battery cell 10 is transferred to the phase change working medium. The phase change working medium absorbs heat from the battery cell 10 in the area abutting against the battery cell 10. After absorbing heat, the phase change working medium changes phase, for example, from liquid to gas. The gaseous phase change working medium can move in the sealed cavity 220, and when it moves to the area away from the battery cell 10 of the cover plate 22, which has a relatively low temperature, it releases heat and condenses to form a liquid. After the heat is transferred to the area away from the battery cell 10 of the cover plate 22, it is dissipated to the air, thereby achieving dissipation of the heat of the battery cell 10 to the outside of the box 20. The liquid phase change working medium formed after condensation flows back to the area abutting against the battery cell 10 under the action of gravity, and thus circulates continuously, achieving continuous heat dissipation of the battery cell 10.

[0091] The battery device 100 provided in this application includes a housing 20 and a battery cell 10. The housing 20 includes a frame 21 and a cover plate 22. The cover plate 22 seals the opening 210 of the frame 21 to form a receiving cavity 201, which can isolate the battery cell 10 from the external environment. The cover plate 22 serves as both a cover and a heat dissipation component for the housing 20. The sealed cavity 220 inside the cover plate 22 is filled with a phase change working fluid. When the temperature of the battery cell 10 against which the cover plate 22 is in contact rises, the heat of the battery cell 10 is transferred to the side of the cover plate 22 against which the battery cell 10 is in contact, and then to the phase change working fluid inside the sealed cavity 220 of the cover plate 22, causing the phase change working fluid to evaporate. The vapor formed by the evaporation fills the sealed cavity 220 and moves randomly within the sealed cavity 220. When the vapor moves to the side of the cover plate 22 away from the battery cell 10, the heat of the vapor is transferred to the side of the cover plate 22 away from the battery cell 10 and then dissipated into the air. The vapor condenses and liquefies due to the decrease in temperature and flows back to the side of the cover plate 22 that is in contact with the battery cell. This cycle repeats to dissipate heat from the battery device 100. The battery device 100 of this application uses the phase change working medium inside the cover plate 22 for heat transfer. The passive heat dissipation scheme of the battery device 100, which achieves heat dissipation through the phase change cycle of the phase change working medium, replaces the traditional liquid cooling cycle scheme. The heat dissipation system structure of the battery device 100 is simplified, significantly reducing the risk of leakage and maintenance costs. At the same time, the phase change of the phase change working medium inside the cover plate 22 achieves rapid heat diffusion, resulting in a more uniform heat distribution and reducing the risk of local overheating.

[0092] like Figure 7 As shown, Figure 7 This is a partial cross-sectional schematic diagram of the cover plate 22 in the battery device 100 provided in one or more embodiments of this application. In some embodiments, the inner surface of the sealing cavity 220 is provided with microgrooves 2200.

[0093] In this embodiment, the microgrooves 2200 are mainly used to increase the area of ​​the inner surface of the sealing cavity 220, thereby effectively increasing the contact area between the phase change working fluid and the inner surface of the sealing cavity 220, promoting the circulation efficiency of the vapor-liquid phase change during the phase change process, and thus improving the heat dissipation efficiency.

[0094] The micro-grooves 2200 can be formed by machining, chemical etching or laser engraving, and can have a depth of millimeter or micrometer. The micro-grooves 2200 can be distributed in a dot shape or in a long groove structure, and can have a rectangular, trapezoidal or semicircular cross-sectional shape. The structure and distribution of the micro-grooves 2200 can be various, as long as the area of the inner surface of the sealed cavity 220 can be increased. The micro-grooves 2200 can be distributed on the entire inner surface of the sealed cavity 220 to increase the contact area between the phase change working medium and the inner surface of the sealed cavity 220 as much as possible. The micro-grooves 2200 can also be distributed on part of the inner surface of the sealed cavity 220 without covering the entire inner surface of the sealed cavity 220.

[0095] In some embodiments, referring to Figure 4 , the sealed cavity 220 includes a plurality of spaced and sealed sub-cavities 221.

[0096] In this embodiment, the sealed cavity 220 is composed of a plurality of sub-cavities 221. Each sub-cavity 221 can constitute an independent heat exchange unit, and can realize rapid condensation of the phase change working medium after vaporization for local overheating, so as to achieve rapid heat dispersion. The structure of the plurality of sealed sub-cavities 221 can also facilitate the partitioned thermal management of the battery device 100.

[0097] In addition, since the inner part of the cover plate 22 is a multi-cavity structure, compared with a single-cavity structure, the multi-cavity structure has better mechanical properties. For example, the multi-cavity structure can provide a certain structural strength of the cover plate 22 in the thickness direction, so that the bending strength, rigidity and compression resistance of the cover plate 22 can be improved to a certain extent. In addition, since the cover plate 22 needs to absorb the heat of the battery monomer 10, when the temperature of the battery monomer 10 changes, the thermal expansion and contraction of the cover plate 22 will be caused to a certain extent. The multi-cavity structure of the cover plate 22 can cause the deformation of each region of the cover plate 22 to mutually restrict each other, reduce the amplitude of the overall deformation of the cover plate 22, and improve the long-term stability of the overall size of the cover plate 22. In addition, the multi-cavity structure contains more divided and sealed air units, which can also improve the heat and sound insulation performance compared with the single-cavity structure.

[0098] The shape of the sub-cavity 221 can be various, such as rectangular, circular, triangular, etc. The arrangement of the plurality of sub-cavities 221 can also be various, such as linear arrangement or matrix arrangement. The area and number of the sub-cavities 221 can be adjusted according to actual needs, such as four to twelve sub-cavities 221 can be arranged according to the heat dissipation demand and strength demand.

[0099] The cover plate 22 can be made of materials such as, but not limited to, aluminum alloy, to improve heat transfer efficiency. The aluminum alloy grade can be, but is not limited to, 6061-T6. This grade means that the base material is an aluminum-magnesium-silicon alloy, and the processing state is solution treated and artificially aged. It is a heat-treatable aluminum alloy with high strength, good corrosion resistance, and excellent processing performance. In a specific embodiment, the area of ​​the cover plate 22 can be 1200mm × 800mm, the overall thickness of the cover plate 22 can be set to 20mm, and the wall thickness of the cover plate 22 can be set to 1.5 ± 0.1mm.

[0100] like Figure 8 As shown, Figure 8 This is a schematic plan view of the split structure of the cover plate 22 in the battery device 100 provided in one or more embodiments of this application. In some embodiments, the cover plate 22 includes a plate body 222 and two end plates 223. The plate body 222 has a plurality of isolation portions 2220, which define a plurality of sub-cavities 221. The plurality of sub-cavities 221 extend through the plate body 222 along a first direction x1, and are arranged at intervals along a second direction x2. The first direction x1 and the second direction x2 intersect each other and are respectively intersecting the thickness direction of the cover plate 22. The two end plates 223 are respectively covered at both ends of the plate body 222 along the first direction x1 to close the plurality of sub-cavities 221. Exemplarily, the first direction x1, the second direction x2 and the thickness direction of the cover plate 22 are perpendicular to each other.

[0101] In this embodiment, the sub-cavities 221 are closed by the combination structure of the plate body 222 and the end plate 223. Each sub-cavity 221 is a cavity structure that penetrates the plate body 222. Therefore, the plate body 222 can be made by extrusion molding to form each sub-cavity 221 inside it. Then, the two end plates 223 are used to seal the two ends of the plate body 222, so that the sub-cavities 221 form a closed space. The sealing plate 22 adopts this structure, which is conducive to the molding of the closed sub-cavities 221. Its manufacturing process is simpler and can achieve low-cost manufacturing.

[0102] After the main body 222 is formed, the end plate 223 can be fastened with bolts or welded to the main body 222. To further improve the sealing performance, a sealant can be used to seal the joint surface between the end plate 223 and the main body 222. The sealant can be a self-healing coating such as EP42HT-2NSF.

[0103] Continue reading Figure 8In some embodiments, the isolation portion 2220 is provided with a notch 2221 at an end thereof along the first direction x1, and the adjacent sub-cavities 221 are in communication via the notch 2221, and the end plate 223 is provided with a liquid injection opening 2230 in communication with at least one of the sub-cavities 221.

[0104] In the present embodiment, the end of the isolation portion 2220 is provided with the notch 2221, which forms a communication passage between the adjacent sub-cavities 221, and the liquid injection opening 2230 provided on the end plate 223 is in a communication relationship with at least one of the sub-cavities 221, so that after the end plate 223 is capped on the plate body 222, the phase change working medium can be injected into the sub-cavities 221 through the liquid injection opening 2230, and the phase change working medium can be filled into each of the sub-cavities 221 through the communication of each of the isolation portions 2220, and the filling process of the phase change working medium is simplified.

[0105] The notch 2221 can be arc-shaped, zigzag-shaped or stepped-shaped, and the notch 2221 can be machined before the end plate 223 is capped on the plate body 222, and the liquid injection opening 2230 can be machined on the end plate 223 after the end plate 223 is capped on the plate body 222 for injection of the phase change working medium, and the liquid injection opening 2230 can be closed by a plug 2231, and the plug 2231 is opened before the phase change working medium is injected, and the plug 2231 is closed after the phase change working medium is injected into the sub-cavities 221, so that a sealed cavity is formed inside the capping plate 22.

[0106] In some embodiments, for the convenience of injection of the phase change working medium, the sealed cavity 220 can be subjected to vacuumizing treatment through the liquid injection opening 2230 before the phase change working medium is injected, so that the sealed cavity 220 is a vacuum chamber, and the phase change working medium in the storage tank can automatically flow into the sealed cavity 220, so that the sealed cavity 220 is filled with the phase change working medium.

[0107] In some embodiments, the capping plate 22 includes a first stamping plate and a second stamping plate arranged along the thickness direction thereof, and the first stamping plate and the second stamping plate are connected and jointly enclosed to form the sealed cavity 220.

[0108] The first stamping plate and the second stamping plate can be manufactured by a stamping forming process. The opposite surfaces of the first stamping plate and the second stamping plate each have a groove structure. When the first stamping plate and the second stamping plate are butted, the first stamping plate and the second stamping plate jointly form the cover plate 22, and the grooves of the first stamping plate and the second stamping plate jointly form the sealing cavity 220 of the cover plate 22. The connection mode of the first stamping plate and the second stamping plate can be welding. Specifically, welding is performed along the circumferences of the first stamping plate and the second stamping plate. The welding mode can be, for example, brazing. Specifically, brazing utilizes filler metal to realize welding. The melting point of the filler metal is lower than the melting point of the first stamping plate and the second stamping plate (the first stamping plate and the second stamping plate can be referred to as base metal). The base metal is heated to a temperature higher than the melting point of the filler metal but lower than the melting point of the base metal. The molten liquid filler metal wets, spreads, and fills the gap between the base metal, and is mutually dissolved and diffused with the base metal, thereby realizing firm connection between the base metal. By using the brazing process for connection, the first stamping plate and the second stamping plate have small deformation and good appearance quality. In addition, the filler metal can penetrate the base metal by capillary action, thereby being able to provide excellent welding sealing performance. In addition, because the heating temperature is relatively low, and the entire workpiece of the base metal is usually uniformly heated, the great thermal stress and deformation caused by local high-temperature melting are reduced, and the size precision and geometric shape of the cover plate 22 formed after brazing can be well maintained.

[0109] In the embodiment, the first stamping plate and the second stamping plate are connected and jointly enclosed to form the sealing cavity 220, and the structure and arrangement mode of the sealing cavity 220 can be more flexibly arranged.

[0110] In some embodiments, the phase change working medium fills part of the sealing cavity 220, and the volume of the phase change working medium is 30% to 70% of the total volume of the sealing cavity 220. For example, the volume of the phase change working medium is 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, or 70% of the total volume of the sealing cavity.

[0111] In the embodiment, because the volume of the phase change material sharply expands when the phase change material absorbs heat to generate liquid-gas phase change, the phase change working medium only fills part of the sealing cavity 220, and does not completely fill the sealing cavity 220. The space in the sealing cavity 220 that is not filled by the phase change working medium provides an expansion space for the vapor generated by the phase change, allowing the vapor to expand. This effectively buffers the sharp rise in pressure in the sealing cavity 220, maintains the internal pressure of the cover plate 22 within a designed safe range, and improves the operation reliability and stability of the battery device 100. If the filling volume of the phase change working medium is too low, the heat absorption capacity of the phase change may be insufficient, and if the filling volume is too high, the free diffusion of the gas-phase refrigerant may be hindered. The filling range of 30% to 70% improves the continuity of the phase change cycle and reduces the stress of the phase change working medium on the structure of the sealing cavity 220.

[0112] Please refer to Figure 9 , Figure 9is a partial cross-sectional view of the cover plate 22 in the battery device 100 provided by one or more embodiments of the present application. In some embodiments, a heat-conducting layer 2201 is arranged on the inner surface of the sealed cavity 220. The heat-conducting layer 2201 is used to enhance the heat-conducting performance between the cover plate 22 and the phase-change working medium, and reduce the thermal resistance. Exemplarily, the heat-conducting layer 2201 can be made of aluminum nitride material. The aluminum nitride has a very high thermal conductivity, and can establish numerous micro heat bridges at the contact interface between the cover plate 22 and the phase-change working medium, provide a better heat passage, greatly reduce the contact thermal resistance between the interface, achieve the interface enhancement effect, and has a high thermal stability and good chemical inertness, can withstand high-temperature working environment, and improve the long-term stability and reliability of the interface performance. The thickness of the heat-conducting layer 2201 can be nanoscale or micrometer scale, and the heat-conducting layer 2201 can be made by spraying, chemical vapor deposition or vacuum filling process.

[0113] In some embodiments, when the micro-groove 2200 is arranged on the inner surface of the sealed cavity 220, the heat-conducting layer 2201 also covers the micro-groove 2200.

[0114] Please refer to Figure 10 , Figure 10 is a partial cross-sectional view of the cover plate 22 in the battery device 100 provided by one or more embodiments of the present application. In some embodiments, a corrosion-resistant layer 2202 is arranged on the inner surface of the sealed cavity 220. The corrosion-resistant layer 2202 is used to isolate the cover plate 22 from the phase-change working medium filled in the sealed cavity 220, reduce the corrosion of the phase-change working medium to the cover plate 22, and thus reduce the risk of sealing failure caused by corrosion. The thickness of the corrosion-resistant layer 2202 can be nanoscale or micrometer scale, and the corrosion-resistant layer 2202 can be made by spraying, chemical vapor deposition or vacuum plating process. It should be noted that the material selection of the corrosion-resistant layer 2202 needs to be compatible with the material of the phase-change working medium, and can remain stable at the working temperature.

[0115] The corrosion-resistant layer 2202 is compatible with the phase-change working medium means that the corrosion-resistant layer 2202 and the phase-change working medium need to have good chemical compatibility, and it is difficult for the two to react chemically. The corrosion-resistant layer 2202 and the phase-change working medium also need to have good physical compatibility, and the phase-change working medium basically cannot cause the physical state of the corrosion-resistant layer 2202 to change, for example, the liquid molecules of the phase-change working medium are difficult to penetrate into the corrosion-resistant layer 2202 to cause the corrosion-resistant layer to expand or soften. Therefore, the contact between the phase-change working medium and the corrosion-resistant layer 2202 is difficult to cause the corrosion-resistant layer 2202 to peel off, wrinkle or fall off from the inner surface of the sealed cavity 220, and the phase-change working medium is also difficult to erode the corrosion-resistant layer 2202 to cause the corrosion-resistant layer 2202 to lose its density and affect the corrosion-resistant effect of the corrosion-resistant layer 2202.

[0116] In some embodiments, the inner surface of the sealed cavity 220 is provided with both the heat-conducting layer 2201 and the anticorrosion layer 2202, and the anticorrosion layer 2202 covers the heat-conducting layer 2201. In other words, the anticorrosion layer 2202 directly contacts the phase-change working medium in the sealed cavity 220, and the heat-conducting layer 2201 directly contacts the cover plate 22. Since the core function of the heat-conducting layer 2201 is to conduct heat from the cover plate 22 to the phase-change working medium, it needs to have good bonding force with the cover plate 22, while the core function of the anticorrosion layer 2202 is to resist corrosion of the phase-change working medium to the cover plate 22, which needs to have better compatibility and chemical stability with the phase-change working medium. Therefore, the anticorrosion layer 2202 is arranged to cover the heat-conducting layer 2201, which is equivalent to providing protection for the heat-conducting layer 2201, so that the heat-conducting layer 2201 is isolated from the phase-change working medium, thereby improving the long-term stability of the heat-conducting layer 2201. In addition, with this laminated structure, the heat transfer path is cover plate 22→ heat-conducting layer 2201→ anticorrosion layer 2202→ phase-change working medium, and the high heat-conducting performance of the heat-conducting layer 2201 improves the smoothness of heat transfer along the path from the cover plate 22 to the anticorrosion layer 2202, and the total thermal resistance of the entire path is low.

[0117] In some embodiments, a multi-layer mesh skeleton (not shown in the figure) is arranged in the sealed cavity 220, and the multi-layer mesh skeleton forms a capillary flow channel for the phase-change working medium to flow.

[0118] The multi-layer mesh skeleton can form a three-dimensional skeleton together with a plurality of mesh sheets, the porosity of the mesh sheets can be controlled to about 85%, the wire diameter can be controlled to about 0.3 mm, the mesh size can be adjusted according to the characteristics of the phase-change working medium, and the material can be selected from metal materials with high heat conductivity such as copper and nickel. The mesh skeleton can be connected to the inner wall of the sealed cavity 220 through a vacuum diffusion welding process to form a multi-stage flow channel with capillary action. The capillary flow channel is formed depending on the gap channels between the mesh sheets and the surface tension effect, so that the phase-change working medium circulates directionally in the sealed cavity 220.

[0119] In this embodiment, the capillary flow channel formed by the multi-layer mesh skeleton can significantly improve the circulation efficiency of the phase-change working medium in the sealed cavity 220, so that heat is evenly and quickly spread in the sealed cavity 220.

[0120] In some embodiments, the cover plate 22 includes a body 225 and a heat dissipation fin 224, the sealed cavity 220 is arranged in the body 225, the body 225 is arranged to abut against the battery monomer 10, and the heat dissipation fin 224 is arranged on the side of the body 225 away from the battery monomer 10.

[0121] In this embodiment, the cover plate 22 is provided with a heat dissipation fin 224, which can increase the contact area with air, that is, increase the heat dissipation area of the cover plate 22. After the heat of the battery monomer 10 is transferred to the side of the cover plate 22 away from the heat dissipation fin 224, the phase change working medium inside the cover plate 22 absorbs heat and vaporizes, the steam moves towards the side of the heat dissipation fin 224, transfers heat to the heat dissipation fin 224, and then dissipates heat. Through the setting of the heat dissipation fin 224, the heat dissipation capacity of the cover plate 22 is improved.

[0122] Wherein, the body 225 refers to the hollow plate-shaped part of the cover plate 22 excluding the heat dissipation fin 224. The heat dissipation fin 224 and the body 225 can be integrally arranged; the heat dissipation fin 224 and the body 225 can also be arranged separately. When the heat dissipation fin 224 and the body 225 are arranged separately, a thermal interface material layer can be arranged between the heat dissipation fin 224 and the body 225. The thermal interface material layer can be made of materials such as thermal silicone grease, thermal adhesive, thermal pad or thermal gel. The thermal interface material layer fills the gap between the surfaces of the heat dissipation fin 224 and the body 225, which can effectively reduce the contact thermal resistance, thereby improving the efficiency of heat transfer from the body 225 to the heat dissipation fin 224, and further improving the heat dissipation capacity of the cover plate 22.

[0123] The heat dissipation fin 224 can be densely arranged along the entire surface of the cover plate 22 to further improve the heat dissipation capacity of the cover plate 22.

[0124] In some embodiments, the battery device 100 can also include a fan, which can be arranged adjacent to the cover plate 22, and the air outlet of the fan is arranged towards the cover plate 22. When the cover plate 22 is provided with a heat dissipation fin 224, the air outlet of the fan can be arranged towards the heat dissipation fin 224 to improve the heat dissipation effect.

[0125] The fan can be started as needed. When the heat dissipation demand is small, the fan can be kept in a closed state to achieve natural cooling. When the heat dissipation demand is large, the fan can be started to achieve forced air cooling, thereby improving the heat dissipation capacity. Through the setting of the fan, the battery device 100 of the present application can meet different heat dissipation demands. The number of fans can be selected as needed to meet the required heat dissipation effect.

[0126] In some embodiments, the cover plate 22 abuts the side of the battery monomer 10 away from the electrode terminal 101.

[0127] Wherein, the side of the battery monomer 10 away from the electrode terminal 101 refers to the other side of the battery monomer 10 on which no electrode lead is arranged. The cover plate 22 directly contacts the non-electrode terminal side of the battery monomer 10, thereby increasing the contact area between the cover plate 22 and the battery monomer 10, and improving the heat dissipation capacity of the cover plate 22 to the battery monomer 10.

[0128] To further improve the heat transfer efficiency of the cover plate 22 and the battery monomer 10, a thermal interface material layer can also be provided between the cover plate 22 and the battery monomer 10. The thermal interface material layer can be made of materials such as thermal silicone grease, thermal adhesive, thermal pad or thermal gel. The thermal interface material layer fills the gap between the cover plate 22 and the battery monomer 10, effectively reduces the contact thermal resistance, improves the efficiency of heat transfer from the battery monomer 10 to the cover plate 22, and further improves the heat dissipation capacity.

[0129] In some embodiments, the phase change working medium includes a composite refrigerant, the composite refrigerant includes a phase change refrigerant and a phase change temperature regulator, the volume ratio of the phase change refrigerant is greater than that of the phase change temperature regulator, and the evaporation temperature of the phase change refrigerant is lower than the phase change temperature of the composite refrigerant.

[0130] In this embodiment, the phase change working medium uses a composite refrigerant. In the composite refrigerant, the refrigerant generally has strong heat absorption capacity, and the addition of the phase change temperature regulator can change the phase change temperature of the composite refrigerant. Through the volume ratio control of the phase change refrigerant and the phase change temperature regulator, more efficient heat absorption and temperature regulation can be achieved, so that the composite refrigerant can adapt to the working temperature requirements of the battery device 100.

[0131] For example, the volume of the phase change refrigerant is 70% of the total volume of the composite refrigerant, and the volume of the phase change temperature regulator is 30% of the total volume of the composite refrigerant. The volume ratio of the phase change refrigerant and the phase change temperature regulator can be adjusted according to the phase change temperature required by the composite refrigerant. The greater the volume ratio of the phase change temperature regulator, the higher the phase change temperature of the composite refrigerant. By doping the phase change temperature regulator, the phase change of the composite refrigerant under normal pressure can be realized. Of course, the application also does not exclude the phase change of the composite refrigerant under negative pressure.

[0132] For example, the phase change refrigerant can use R1233zd. R1233zd is a new type of hydrofluoroalkene refrigerant, the chemical name is trans-1-chloro-3,3,3-trifluoropropene, and the molecular formula is CF3CH=CHCl. It is non-flammable, non-toxic, and has good safety performance. Its GWP (Global Warming Potential: Global Warming Potential) is only 1, which is much lower than that of traditional refrigerants, and has good environmental protection performance. The boiling point of R1233zd under one standard atmosphere (1 atm) is 19℃, which can evaporate easily at low temperature.

[0133] For example, the phase change temperature regulating material can use octacosane (Octacosane), which has the chemical structure CH3(CH2)26CH3 and the molecular formula C28H58. It is a white powder or scaly crystal at room temperature, with a melting point (under one standard atmosphere) of 57-62℃ and a boiling point of 278℃ (under 15mmHg pressure).

[0134] The phase change of the embodiment of the present application can be realized under normal pressure by using the combination of R1233zd and octacosane. The phase change working medium of the embodiment of the present application is not limited to the combination of R1233zd and octacosane, but other types of refrigerants and other types of phase change temperature adjusting materials can also be used. Through the combination of different refrigerants and phase change temperature adjusting materials, the phase change temperature of the phase change working medium can finally be kept at the preset phase change temperature.

[0135] In some embodiments, the phase change temperature of the composite refrigerant is between 45℃ and 55℃. Exemplarily, the phase change temperature of the composite refrigerant is 45℃, 48℃, 50℃, 52℃ or 55℃.

[0136] By setting the phase change temperature of the composite refrigerant between 45℃ and 55℃, a more accurate match with the temperature range of the battery device 100 can be formed. When the temperature of the battery monomer 10 exceeds 45℃, the composite refrigerant immediately starts the vaporization phase change endothermic mechanism, effectively inhibits the local overheating phenomenon, realizes the rapid heat dissipation of the battery monomer 10, and at the same time can control the temperature difference of each battery monomer 10 within the preset temperature difference range.

[0137] The second aspect of the present application also provides a energy storage device, the energy storage device includes any battery device 100 of the first aspect of the present application, the battery device 100 is used for storing electric energy, for the detailed introduction of the battery device 100, see the full text, this place no longer repeat. Since the energy storage device has the battery device 100 of the first aspect as above, the energy storage device has the same beneficial effects as the battery device 100 of the first aspect as above, and the present application will not be described here.

[0138] The third aspect of the present application also provides a power consuming device, which comprises any battery device 100 of the first aspect of the present application, and the battery device 100 is used to provide electric energy. For details of the battery device 100, please refer to the full text, which will not be repeated here. Since the power consuming device has the battery device 100 of the first aspect as above, the power consuming device has the same beneficial effects as the battery device 100 of the first aspect as above, which will not be repeated here. It should be noted that since the battery device 100 of the present application adopts the sealing cover plate 22 for heat dissipation, it belongs to a passive heat dissipation system, and is more suitable for scenes with small heat dissipation requirements, such as hybrid cars, extended range cars, etc. In actual application, it can also be further matched with a fan to realize forced air cooling to adapt to different heat dissipation requirements. In addition, it should be noted that since the battery device 100 provided by the present application realizes independent heat dissipation of the battery device 100 through the phase change of the phase change working medium inside the sealing cover plate 22, the battery device 100 does not need to be connected to the cooling system of the whole vehicle to realize heat dissipation, and therefore it is more suitable for vehicles with quick-change batteries. Quick-change batteries are usually also called battery replacement technology, which refers to a technology that through a full-automatic or semi-automatic battery replacement station, a battery device with insufficient power on a vehicle is taken off as a whole in a short time (usually 3-5 minutes), and immediately replaced with a battery device that has been fully charged.

[0139] Finally, in a specific application scenario, in view of the problems of sealing leakage risk and system complexity and high cost caused by the liquid cooling technology of the existing battery device, a battery device is provided, comprising a battery monomer 10 and a box body 20, the box body 20 comprises a frame 21 and a cover plate 22, the frame 21 is provided with an opening 210, the cover plate 22 is connected with the frame 21 to block the opening 210 to form a containing cavity 201, the battery monomer 10 is contained in the containing cavity 201, the cover plate 22 abuts against the battery monomer 10, the inside of the cover plate 22 is provided with a sealed cavity 220, and the sealed cavity 220 is filled with a phase change working medium. The phase change working medium fills part of the sealed cavity 220, the volume of the phase change working medium is 60% of the total volume of the sealed cavity 220, the phase change working medium comprises a composite refrigerant, the composite refrigerant comprises a phase change refrigerant and a phase change temperature regulator, the volume of the phase change refrigerant is 70% of the total volume of the composite refrigerant, the volume of the phase change temperature regulator is 30% of the total volume of the composite refrigerant, and the phase change temperature of the composite refrigerant is between 45℃ and 55℃. The inner surface of the sealed cavity 220 is provided with a micro groove 2200, the sealed cavity 220 comprises a plurality of spaced and sealed sub-cavities 221, the cover plate 22 comprises a plate body 222 and two end plates 223, the plate body 222 is provided with a plurality of isolation portions 2220, the plate body 222 defines a plurality of sub-cavities 221 through the plurality of isolation portions 2220, the plurality of sub-cavities 221 respectively extend through the plate body 222 along a first direction x1, and the plurality of sub-cavities 221 are sequentially and spacedly arranged along a second direction x2, wherein the first direction x1 and the second direction x2 intersect and respectively intersect with the thickness direction of the cover plate 22; the two end plates 223 are respectively arranged on both ends of the plate body 222 along the first direction x1 to close the plurality of sub-cavities 221. The end portion of the isolation portion 2220 along the first direction x1 is provided with a notch 2221, the adjacent sub-cavities 221 are communicated through the notch 2221, and the end plate 223 is provided with a liquid injection opening 2230 communicated with at least one sub-cavity 221. The inner surface of the sealed cavity 220 is provided with a heat conduction layer 2201 and a corrosion-resistant layer 2202, and the corrosion-resistant layer 2202 covers the heat conduction layer 2201. The sealed cavity 220 is provided with a plurality of layers of net skeletons, and the plurality of layers of net skeletons form capillary flow channels for the phase change working medium to flow. The cover plate 22 comprises a body 225 and a heat dissipation fin 224, the sealed cavity 220 is arranged in the body 225, the body 225 abuts against the battery monomer 10, and the heat dissipation fin 224 is arranged on the side of the body 225 away from the battery monomer 10. The cover plate 22 abuts against the side of the battery monomer 10 away from the electrode terminal 101.

[0140] By the above manner, the cover plate 22 blocks the opening 210 of the frame 21 to form the containing cavity 201, which can isolate the battery monomer 10 from the external environment. The cover plate 22 serves as a cover component of the box 20 and also as a heat dissipation component. The sealed cavity 220 arranged inside the cover plate 22 is filled with phase change working medium. When the temperature of the battery monomer 10 to which the cover plate 22 is attached rises, the heat of the battery monomer 10 is transferred to the side of the cover plate 22 attached to the battery monomer 10, and then to the phase change working medium in the sealed cavity 220 inside the cover plate 22, so that the phase change working medium evaporates. The steam formed by evaporation fills the sealed cavity 220 and moves randomly in the sealed cavity 220. When the steam moves to the side of the cover plate 22 away from the battery monomer 10, the heat of the steam is transferred to the side of the cover plate 22 away from the battery monomer 10 and then dissipated into the air. The steam condenses and liquefies due to the decrease in temperature, and then flows back to the side of the cover plate 22 attached to the battery monomer. The above process is repeated to achieve heat dissipation of the battery device 100. The battery device 100 of the present application uses the phase change of the phase change working medium inside the cover plate 22 to transfer heat. The passive heat dissipation scheme of the battery device 100, which realizes heat dissipation through the phase change cycle of the phase change working medium, replaces the traditional liquid cooling cycle scheme. The heat dissipation system structure of the battery device 100 is simplified, the risk of leakage and maintenance cost are significantly reduced, and the phase change of the phase change working medium inside the cover plate 22 is used to achieve rapid heat diffusion and more uniform heat distribution, which can reduce the risk of local overheating.

[0141] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0142] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A battery device, characterized by, The battery device comprises: a battery cell; a box body comprising a frame provided with an opening and a cover plate connected with the frame to seal the opening to form a containing cavity, the battery cell is contained in the containing cavity, the cover plate abuts against the battery cell, the side of the cover plate away from the battery cell is located in the external environment of the box body, and a sealed cavity is arranged in the cover plate and filled with phase change working medium.

2. The battery device according to claim 1, wherein an inner surface of the sealed cavity is provided with micro grooves.

3. The battery device according to claim 1 or 2, wherein the sealed cavity comprises a plurality of spaced and sealed sub-cavities.

4. The battery device according to claim 3, wherein the cover plate comprises a plate body and two end plates, the plate body is provided with a plurality of isolation portions, the plate body defines a plurality of sub-cavities through the isolation portions, the sub-cavities extend through the plate body along a first direction respectively, and the sub-cavities are arranged in sequence along a second direction, wherein the first direction and the second direction intersect and each intersects with the thickness direction of the cover plate; and the two end plates are respectively arranged on both ends of the plate body along the first direction to close the sub-cavities.

5. The battery device according to claim 4, wherein an end portion of the isolation portion along the first direction is provided with a notch, adjacent sub-cavities are communicated through the notch, and the end plate is provided with a liquid injection port communicated with at least one sub-cavity.

6. The battery device according to claim 3, wherein the cover plate comprises a first stamping plate and a second stamping plate arranged along the thickness direction thereof, and the first stamping plate and the second stamping plate are connected and jointly enclosed to form the sealed cavity.

7. The battery device according to claim 1, wherein the phase change working medium fills part of the sealed cavity, and the volume of the phase change working medium is 30% to 70% of the total volume of the sealed cavity.

8. The battery device according to claim 2, wherein a heat conduction layer is arranged on the inner surface of the sealed cavity, and the heat conduction layer covers the micro grooves.

9. The battery device according to claim 8, wherein a corrosion-resistant layer is arranged on the heat conduction layer.

10. The battery device according to claim 1 or 2, wherein a plurality of layers of mesh skeletons are arranged in the sealed cavity, and the mesh skeletons form capillary flow channels for the phase change working medium.

11. The battery device according to claim 1 or 2, wherein the cover plate comprises a body and a heat dissipation fin, the sealed cavity is arranged in the body, the body abuts against the battery cell, and the heat dissipation fin is arranged on the side of the body away from the battery cell.

12. The battery device according to claim 1 or 2, wherein the cover plate abuts against the side of the battery cell away from the electrode terminal.

13. The battery device according to claim 1, wherein The phase change working medium comprises a composite refrigerant, the composite refrigerant comprises a phase change refrigerant and a phase change temperature modifier, and the volume ratio of the phase change refrigerant is greater than that of the phase change temperature modifier. The evaporation temperature of the phase change refrigerant is lower than the phase change temperature of the composite refrigerant.

14. The battery device according to claim 13, wherein The phase change temperature of the composite refrigerant is between 45 DEG C and 55 DEG C.

15. An energy storage device, comprising the battery device according to any one of claims 1 to 14.

16. An electric device, comprising the battery device according to any one of claims 1 to 14. ​ ​

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