CN114094228A - Power battery thermal management system based on phase-change material composite soaking plate - Google Patents
Power battery thermal management system based on phase-change material composite soaking plate Download PDFInfo
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- CN114094228A CN114094228A CN202111264537.5A CN202111264537A CN114094228A CN 114094228 A CN114094228 A CN 114094228A CN 202111264537 A CN202111264537 A CN 202111264537A CN 114094228 A CN114094228 A CN 114094228A
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6554—Rods or plates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/659—Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Automation & Control Theory (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention discloses a power battery thermal management system based on a phase change material composite soaking plate, which comprises a battery module shell, a plurality of battery units, a plurality of phase change material plates, a plurality of soaking plates and a bottom water cooling module, wherein the largest two side surfaces of each battery unit are respectively coated by the phase change material plates, one soaking plate is arranged between every two adjacent phase change material plates, and the condensation end of each soaking plate is embedded into the water cooling plate for strengthening heat dissipation. The invention fully utilizes the phase change latent heat energy storage characteristic of the phase change material, and simultaneously combines the advantages of the efficient heat transfer and water cooling heat dissipation technologies of the soaking plate, thereby meeting the temperature control requirements of the power battery under different working conditions. The invention can effectively improve the space utilization rate and the heat dissipation efficiency of the system, ensure that the power battery is always kept in a proper temperature range, reduce the temperature difference among different battery units, improve the temperature uniformity of the system, and further improve the service performance and the service life of the power battery module.
Description
Technical Field
The invention belongs to the technical field of power battery thermal management, and particularly relates to a power battery thermal management system of a phase change material composite vapor chamber.
Background
The service performance and the service life of the power battery are closely related to the working temperature, the performance of the battery can be optimal only when the power battery works in a proper temperature range, and the thermal safety of the power battery can be ensured. The excessive temperature easily causes thermal runaway of the battery monomer and even the battery module, and further causes safety accidents such as combustion, explosion and the like. And excessively low temperature lowers the electrochemical reaction activity inside the battery, resulting in a sharp drop in the performance of the battery.
Although the traditional battery air cooling technology is simple in technology and low in cost, the low gas thermal conductivity causes low heat dissipation efficiency; although the conventional liquid cooling technology has high heat dissipation efficiency, the application of the conventional liquid cooling technology is greatly limited due to the non-uniformity of heat dissipation, the complex structure, the high cost and the potential leakage risk.
With the continuous driving mileage of electric vehicles and the continuous improvement of the requirements on battery energy and power density, the heat dissipation requirement of power batteries is also continuously improved, so that the development of a high-efficiency and safe power battery thermal management system is urgently needed.
Disclosure of Invention
In order to solve the problems, the invention provides a thermal management system for a power battery of a phase-change material composite soaking plate, which makes full use of the phase-change latent heat energy storage characteristic of the phase-change material, combines the advantages of the efficient heat transfer and water-cooling heat dissipation technologies of the soaking plate, meets the temperature control requirements of the power battery under different working conditions, can effectively improve the space utilization rate and the heat dissipation efficiency of the system, ensures that the power battery is always kept in a proper temperature range, reduces the temperature difference among different battery units, improves the temperature uniformity of the system, and further improves the service performance and the service life of a power battery module.
The invention provides a power battery heat management system based on a phase change material composite soaking plate, which comprises a battery module shell, a plurality of battery units, a phase change material plate, a soaking plate and a water cooling module, wherein the battery units are arranged in the shell after being connected in series or in parallel in a group, the phase change material plate is tightly attached to the side face with the largest battery area, the soaking plate is embedded between the two phase change material plates, and the water cooling module is positioned at the bottom of the whole battery module.
Furthermore, a heat insulation plate and a buffer layer are arranged between the battery unit and the battery module shell and used for preventing the diffusion and spreading when the battery is out of control due to heat.
Furthermore, two side faces of the maximum area of the battery unit are symmetrically and closely provided with phase change material plates, and a soaking plate is embedded between two adjacent phase change material plates.
Furthermore, the two sides of each phase change material plate are provided with concave cavities, the concave cavity on one side is attached to the corresponding side face of the battery unit, and the concave cavity on the other side is attached to the corresponding soaking plate, so that the positioning and assembling of the heat management system are facilitated.
Further, the phase change material plate is of a structure that a flexible graphene film covers a phase change material, the phase change material is composed of 80-90% of low-melting-point paraffin and 10-20% of expanded graphite by mass, and the melting point of the phase change paraffin is 30-40 ℃.
The preparation method of the phase change material plate comprises the following steps: heating and stirring a certain amount of low-melting-point paraffin and expanded graphite in a water bath at 70 ℃ for 1h until the molten paraffin is melted into gaps of the expanded graphite, and placing the cooled paraffin-expanded graphite mixture into a mold to be integrally pressed and molded with a graphene film.
The phase-change material has higher latent heat value and thermal conductivity, and the fluffy and porous expanded graphite pores can contain paraffin in a molten state, so that the phase-change material plate keeps good shaping capacity. The graphene film coated on the surface not only prevents paraffin from leaking, but also has high heat conductivity coefficient, which is beneficial to increasing the heat transfer between the battery module and the phase-change material, and has good temperature equalization effect.
Furthermore, the vapor chamber comprises an upper shell plate, a lower shell plate, a liquid absorption core, a supporting body and a working medium, wherein a hollow cavity is formed between the upper shell plate and the lower shell plate in a sealed mode, the supporting body with a three-dimensional structure is arranged inside the hollow cavity, the working medium is filled in the hollow cavity, and the liquid absorption core is arranged in the hollow cavity.
Furthermore, the soaking plate is in a sheet shape, the thickness of the soaking plate is 0.2-0.5mm, the upper shell plate and the lower shell plate are made of metal or alloy materials with high heat conductivity coefficients, the inside of the soaking plate is vacuumized to form a hollow cavity, and the working medium is one or a mixture of methanol, ethanol, acetone, deionized water, ammonia and freon.
Further, the liquid absorption core is a capillary structure with loose and porous structures, and the liquid absorption core is one or more of a wire mesh, fibers, powder and foam materials of metal and alloy materials.
Furthermore, the part of the soaking plate, which is in contact with the phase change material plate, is an evaporation end, and the part of the soaking plate, which extends downwards and is embedded in the groove of the water cooling module, is a condensation end.
Furthermore, the water cooling device comprises a water cooling plate at the bottom, a temperature detector for detecting the temperature of the battery module, and a control module for controlling the flow rate of cooling water. The temperature detection module is placed on the middle surface inside the battery module, and the control module is connected with the temperature detector. When the temperature that detects battery module is higher than suitable operating temperature interval, control module controls the start of water-cooling module to adjust cooling water flow according to the temperature rise condition, with the water-cooling module of battery module internal temperature rapid transfer to bottom, give off the heat through convection heat transfer fast.
Further, the water-cooling module is formed by processing an aluminum alloy material, a plurality of independent longitudinal runners are processed inside the water-cooling module, a water inlet and a water outlet are formed in two ends of each longitudinal runner respectively, a groove used for embedding a vapor chamber condensation end and a rectangular groove used for installing and positioning a battery module are processed on the water-cooling module, and the vapor chamber grooves and the longitudinal runners are arranged at intervals.
Further, when the ambient temperature is lower than zero or the ambient temperature is lower than the phase transition temperature of the phase change material plate, the phase change material plate releases the latent heat of the phase change material plate to be used for heat preservation of the battery unit.
Compared with the prior art, the invention can realize the following beneficial effects:
(1) the invention fully utilizes the phase change latent heat energy storage characteristic of the phase change material, and simultaneously combines the advantages of the efficient heat transfer and water cooling heat dissipation technology of the soaking plate, thereby meeting the temperature control requirements of the power battery under different working conditions.
(2) The invention can effectively improve the space utilization rate and the heat dissipation efficiency of the system, ensure that the power battery is always kept in a proper temperature range, reduce the temperature difference among different battery units, improve the temperature uniformity of the system, and further improve the service performance and the service life of the power battery module.
Drawings
FIG. 1: and the structural schematic diagram of the power battery thermal management system.
FIG. 2: the structure of the power battery thermal management system is shown in an explosion diagram.
FIG. 3: three views and a cross section of the water cooling plate.
Shown in the attached drawings: 1-battery module shell, 2-battery unit, 3-phase change material plate, 4-vapor chamber and 5-water cooling module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention
Fig. 1 and 2 show a thermal management system for a power battery based on a phase-change material composite soaking plate, which is provided by the invention, and comprises a battery module shell 1, a plurality of battery units 2 uniformly and longitudinally arranged in the battery module shell 1, a plurality of phase-change material plates 3, a plurality of soaking plates 4 and a water cooling module 5.
In some embodiments of the present invention, each of the battery cells 2 is shaped like a rectangular parallelepiped, and a plurality of battery cells 2 are connected in series or in parallel to form a battery module.
In some embodiments of the present invention, a thermal insulation plate and a buffer layer are disposed between the battery cell 2 and the battery module case 1 to prevent diffusion and spreading when thermal runaway occurs in the battery.
In the invention, two side surfaces of each battery unit 2 are respectively coated with a phase change material plate 3, a soaking plate 4 is arranged between two adjacent phase change material plates 3, and the condensation end of each soaking plate 4 is downwards embedded into a water cooling module 5 for heat dissipation.
In some embodiments of the present invention, the side of each battery unit 2 with the largest area is installed in a cavity of a phase change material plate 3, the adjacent surfaces of two adjacent phase change material plates 3 are provided with cavities, the depth of each cavity is half of the thickness of a soaking plate 4, the soaking plates 4 are embedded in the cavities, and the condensation ends of the soaking plates 4 extend downwards to a water cooling module 5 at the bottom of the battery module for enhanced heat dissipation.
In some embodiments of the present invention, the phase-change material plate 3 is a graphene film-coated phase-change material structure, the phase-change material includes 80 to 90 mass% of low-melting-point paraffin with a melting point of 30 to 40 ℃ and 10 to 20 mass% of expanded graphite, a predetermined amount of the low-melting-point paraffin and the expanded graphite are heated and stirred in a water bath at 70 ℃ for 1 hour, and the cooled paraffin-expanded graphite mixture is placed in a mold and integrally pressed with the graphene film to form the phase-change material plate 3.
In some embodiments of the present invention, the bottom of the phase change material plate 3 is flush with the bottom of the battery cell 2, so that the phase change material plate 3 can completely cover the side of the battery cell 2, and can be placed on the water-cooling plate, which is convenient for assembly.
In some embodiments of the present invention, the vapor chamber 4 is in a sheet shape, has a thickness of 0.2-0.5mm, and comprises an upper shell plate, a lower shell plate, a support body, a wick having a porous capillary structure, and a working medium, wherein a hollow cavity is formed between the upper shell plate and the lower shell plate in a sealed manner, the upper end and the lower end of the support body are respectively connected with the upper shell plate and the lower shell plate to prevent collapse of the cavity due to pressure difference between the inside and the outside of the cavity, the working medium is filled in the hollow cavity, and the wick is disposed in the hollow cavity and immersed in the working medium.
The upper shell plate and the lower shell plate are both made of metal or alloy materials with high heat conductivity coefficient, and a hollow cavity formed inside is vacuumized. In some embodiments of the invention, the metal includes, but is not limited to, copper, aluminum. Alloy materials include, but are not limited to, copper alloys, aluminum alloys.
In some embodiments of the invention, the working medium is one or more mixtures of methanol, ethanol, acetone, deionized water, ammonia, freon.
In some embodiments of the invention, the wick is one or more of a mesh, fiber, powder, and foam of metal and alloy materials having a porous, capillary structure. The support body is a columnar or strip-shaped structure made of metal materials.
The part of the soaking plate 4, which is in contact with the phase change material plate 3, is an evaporation end, and the part of the soaking plate, which extends downwards and is embedded in the soaking plate groove of the water cooling plate, is a condensation end.
In some embodiments of the present invention, the water-cooling module 5 includes a water-cooling plate located at the bottom, a plurality of independent water flow channels are arranged inside the water-cooling plate at the bottom, water inlets and water outlets are respectively arranged at two ends of the water flow channels, a soaking plate groove for embedding a condensing end of the soaking plate and a battery unit groove for installing and positioning a battery unit are processed on the water-cooling plate, and the soaking plate groove and the water flow channels are arranged at intervals to ensure that each soaking plate has two corresponding water flow channels for heat dissipation. The soaking plate 4 is inserted into the soaking plate groove on the water-cooling plate, and then the heat is transferred to the internal water through the water-cooling plate to dissipate the heat.
The water-cooling board is made by aluminum alloy material, as shown in fig. 3, the inside processing of water-cooling board has fore-and-aft rivers way, and the both ends of fore-and-aft rivers way are water inlet and delivery port respectively, and 5 upper surface processing of water-cooling board have be used for inlaying the soaking plate slot of establishing 4 condensation ends of soaking plate and be used for installing the battery unit slot that is the rectangle of battery module casing 1, soaking plate slot and longitudinal runner interval arrangement.
In some embodiments of the present invention, the water cooling module 5 further includes a temperature detector for detecting a temperature of the battery unit and a control module for controlling a flow rate of cooling water, the temperature detector is disposed on a middle surface inside the battery module (i.e., the temperature detector is disposed on a surface of the battery unit located in the middle), when the temperature of the battery module is detected to be higher than a preset working temperature range, the control module controls the start of the water cooling module, adjusts a flow rate of the cooling water according to a temperature rise condition, rapidly transfers the temperature inside the battery module to the water cooling module at the bottom, and rapidly dissipates heat through convective heat transfer.
In the working process of the power battery management system, when the battery module is under the low-rate charge-discharge condition, the heat generation quantity of the battery unit 2 is less, the phase change material plate 3 can be used for absorbing latent heat to control the temperature of the battery unit 2, and at the moment, even if the soaking plate 4 and the water cooling plate at the bottom do not work, the temperature of the battery module is still maintained in a proper range; when the battery module is at high multiplying power charge-discharge or when being in higher ambient temperature, the heat that the battery module produced is difficult to give off fast, phase change material board 3 absorbed latent heat may exhaust and lead to the thermal management system to become invalid, the thermodetector of bottom water-cooling module monitors the temperature and is higher than after presetting the temperature, control module starts the water-cooling board and dispels the heat to the condensation end of soaking board 4, the water-cooling board that heat 3 accumulations of phase change material board transferred to the bottom fast dispels the heat, thereby guarantee that the battery module works in suitable temperature range all the time, reduce the heat dissipation energy consumption simultaneously. When the ambient temperature is lower than the phase change temperature of the phase change material plate 3 (or when the ambient temperature is lower than zero), the phase change material plate 3 can release a large amount of latent heat for the heat preservation of the battery module, thereby avoiding the rapid reduction of the service performance caused by the rapid reduction of the battery temperature and improving the service performance of the battery module under the low-temperature condition.
The invention fully utilizes the energy storage advantage of the phase-change material and the high thermal conductivity of the graphene film, and simultaneously combines the advantages of the efficient heat transfer of the vapor chamber and the water-cooling heat dissipation technology, thereby meeting the heat dissipation requirements of the power battery under different working conditions and the heat preservation effect under the low-temperature condition. The power battery thermal management system provided by the invention improves the space utilization rate of the system, enhances the heat dissipation efficiency of the battery, and improves the temperature uniformity of the system. The system ensures that the power battery stably works for a long time in a proper temperature range, prolongs the service life of the power battery, reduces the heat dissipation energy consumption, and has the characteristics of energy conservation and high efficiency.
Compared with the prior art, the phase change material plate has the advantages of being simple in structure and reasonable in design, the phase change material plate 3 coated outside the battery unit 2 increases the effective heat dissipation area of the battery, reduces the temperature difference between the electrode of the battery unit 2 and the side face, improves the temperature uniformity of the battery, and can dissipate heat stored in the phase change material plate in time due to the arrangement of the soaking plate 4, so that leakage of the phase change material plate due to overheating melting is effectively prevented, meanwhile, the dissipation of heat under extreme working conditions is guaranteed due to the arrangement of the water cooling plate, and the problem of thermal runaway caused by overhigh temperature of the battery is avoided. And the battery units, the phase change material plates and the soaking plates are sequentially embedded in the water cooling plate to be compactly arranged, so that the battery module heat dissipation systems of different numbers of battery units can be conveniently arranged, and meanwhile, the whole volume of the module is greatly reduced.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a power battery thermal management system based on compound soaking plate of phase change material which characterized in that: comprises a battery module shell, a plurality of battery units, a plurality of phase change material plates, a plurality of vapor chambers and a water cooling module,
a plurality of battery units are arranged in a battery module shell after being connected in series or in parallel in groups, two side faces of each battery unit are respectively coated with a phase change material plate, a soaking plate is arranged between every two adjacent phase change material plates, and a condensation end of each soaking plate is embedded into the water cooling module downwards to dissipate heat.
2. The phase change material composite soaking plate-based power battery thermal management system according to claim 1, characterized in that: phase change material plates are arranged on two side faces of the largest area of each battery unit in a clinging mode, and a soaking plate is embedded between every two adjacent phase change material plates.
3. The phase change material composite soaking plate-based power battery thermal management system according to claim 1, characterized in that: and the two sides of each phase change material plate are respectively provided with a concave cavity, one side of each concave cavity is attached to the corresponding side surface of the battery unit, and the other side of each concave cavity is attached to the corresponding soaking plate.
4. The phase change material composite soaking plate-based power battery thermal management system according to claim 1, characterized in that: the phase change material plate is of a structure that a flexible graphene film covers a phase change material, wherein the phase change material comprises 80-90% of paraffin and 10-20% of expanded graphite by mass, and the melting point of the paraffin is 30-40 ℃.
5. The phase change material composite soaking plate-based power battery thermal management system according to claim 1, characterized in that: the vapor chamber comprises an upper shell plate, a lower shell plate, a liquid absorbing core, a supporting body and a working medium, wherein a hollow cavity is formed between the upper shell plate and the lower shell plate in a sealed mode, the working medium is filled in the hollow cavity, and the liquid absorbing core is arranged in the hollow cavity.
6. The phase change material composite soaking plate-based power battery thermal management system according to claim 5, characterized in that: the working medium is one or a mixture of methanol, ethanol, acetone, deionized water, ammonia and freon, the upper shell plate and the lower shell plate are made of metal or alloy materials, the liquid absorption core is one or more of a wire mesh, fiber, powder and foam material of metal and alloy materials with a loose porous capillary structure, and the support body is a columnar or strip-shaped structure of metal materials.
7. The phase change material composite soaking plate-based power battery thermal management system according to claim 1, characterized in that: the bottom of the phase change material plate is flush with the bottom of the battery cell.
8. The phase change material composite soaking plate-based power battery thermal management system according to claim 1, characterized in that: the water-cooling module is including being located the water-cooling board of bottom, the inside rivers that are provided with a plurality of independence of water-cooling board are said, and the both ends of rivers way are water inlet and delivery port respectively, and processing has the cell unit slot that is used for inlaying the soaking plate slot of establishing the soaking plate condensation end and is used for cell unit installation location on the water-cooling module, soaking plate slot and rivers way interval arrangement.
9. The phase change material composite soaking plate-based power battery thermal management system according to claim 8, characterized in that: the water-cooling module still include the temperature-sensing ware that is used for detecting the battery unit temperature and be used for controlling the control module of cooling water velocity of flow, temperature-sensing ware sets up in the surface of the battery unit in the middle, control module with temperature-sensing ware is connected.
10. The phase change material composite soaking plate-based power battery thermal management system according to any one of claims 1 to 9, wherein: when the ambient temperature is lower than zero or the ambient temperature is lower than the phase change temperature of the phase change material plate, the phase change material plate releases the latent heat of the phase change material plate to be used for heat preservation of the battery unit.
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