CN116404304A - Thermoelectric pre-cooling system for power battery - Google Patents

Abstract

The invention provides a thermoelectric precooling system for a power battery, which comprises a battery module, an air cooling module and a thermoelectric cooling module, wherein the air cooling module comprises an air cooling radiator and first cooling fluid, the air cooling radiator is used for carrying out first cooling treatment on the first cooling fluid, the thermoelectric cooling module comprises a first pipeline unit and a semiconductor refrigerator, a heat absorption end of the semiconductor refrigerator is contacted with the first pipeline unit, the first pipeline unit is used for conveying the first cooling fluid to the battery module, and a heat absorption end of the semiconductor refrigerator is used for carrying out second cooling treatment on the first cooling fluid; in the thermoelectric precooling system for the power battery, the first cooling fluid in heat exchange with the battery module is subjected to cooling treatment twice, so that the working temperature of the battery module is cooled to a proper temperature, and the electrical performance of the battery module is improved.

Description

Thermoelectric pre-cooling system for power battery

technical field

The invention relates to the technical field of power battery energy storage, in particular to a thermoelectric precooling system for power batteries.

Background technique

For the electric vehicle power battery, the power battery at high temperature may have thermal runaway, which will not only shorten the service life of the power battery, but also pose a threat to the safety of the vehicle, and the cruising range of the power battery at low temperature cannot be guaranteed ; thus, effective management of battery heat is critical to improving the range and safety of electric vehicles.

At present, research at home and abroad mainly focuses on the battery cooling system. The existing battery thermal management systems mainly include the following types: air cooling system, heat pipe cooling system, and phase change material cooling system. Air cooling Due to the low heat transfer coefficient of air forced convection, this method cannot meet the heat dissipation requirements of the battery when it operates in a high-power and high-temperature environment. The shape of the heat pipe itself in the heat pipe cooling system cannot match the shape of the battery well, and the service life of the heat pipe is low, which affects the life of the battery system. In the phase change material cooling system, the heat management effect is not ideal due to the limitations of the material itself and the volume of the battery module.

Therefore, there is an urgent need for a thermoelectric precooling system for power batteries to solve the above technical problems.

Contents of the invention

The purpose of the present invention is to provide a thermoelectric pre-cooling system for a power battery, which is used to improve the technical problem of low heat dissipation efficiency of the existing power battery cooling system.

In order to solve the above technical problems, the present invention provides a thermoelectric precooling system for power batteries, including a battery module, an air cooling module connected to the battery module, and a thermoelectric cooling module connected to the air cooling module. A cold radiator and a first cooling fluid, the air-cooled radiator is used to perform a first cooling treatment on the first cooling fluid;

Wherein, the thermoelectric cooling module includes a first pipeline unit and a semiconductor refrigerator, the heat absorption end of the semiconductor refrigerator is in contact with the first pipeline unit, the first pipeline unit is used to deliver the first cooling fluid to the battery module, and the semiconductor refrigerator The heat absorbing end of the refrigerator is used for second cooling treatment on the first cooling fluid.

In the thermoelectric pre-cooling system for power batteries provided by the embodiment of the present invention, the air-cooled module further includes a coolant expansion tank and an electric coolant pump connected to the coolant expansion tank, and the outlet of the coolant expansion tank is connected to the air-cooled heat dissipation The inlet of the coolant expansion tank is connected to the battery module;

Wherein, the coolant expansion tank is used to store the first cooling fluid, and the electric coolant pump is used to pump the first cooling fluid out of the coolant expansion tank.

In the thermoelectric pre-cooling system for power batteries provided by the embodiment of the present invention, the thermoelectric cooling module further includes a second pipeline unit that is not connected to the first pipeline unit, and the heat dissipation between the second pipeline unit and the semiconductor refrigerator end-to-end contact;

Wherein, the second pipeline unit is used to deliver the second cooling fluid, and the second cooling fluid is used as a coolant at the heat release end of the semiconductor refrigerator.

In the thermoelectric pre-cooling system for the power battery provided in the embodiment of the present invention, the thermoelectric cooling module further includes a heat conduction plate, and the heat conduction plate is arranged between the heat absorption end of the semiconductor refrigerator and the heat discharge end of the semiconductor refrigerator;

Wherein, the heat conduction plate is used to improve the heat conduction capacity of the second pipeline unit and the first pipeline unit and the heat conduction capacity of the hot end cooling unit.

In the thermoelectric precooling system for power batteries provided in the embodiment of the present invention, the thermoelectric precooling system further includes a fluid cooling unit connected to the second pipeline unit and a power unit connected to the fluid cooling unit;

Wherein, the fluid cooling unit is used for cooling the heat release end of the semiconductor refrigerator, and the power unit is used for pumping the second cooling fluid from the fluid cooling unit.

In the thermoelectric pre-cooling system for power batteries provided by the embodiments of the present invention, the fluid cooling unit includes a fluid storage tank and a current device, the fluid storage tank is used to store the second cooling fluid, and the current generated by the current device is used to store the second cooling fluid in the fluid. A magnetic field is provided in the box.

In the thermoelectric pre-cooling system for a power battery provided by an embodiment of the present invention, the power unit includes a magnetic pump and a peristaltic pump, the magnetic pump is used to control the continuous flow of the second cooling fluid in the second pipeline unit, and the peristaltic pump is used to The pulse flow of the second cooling fluid in the second pipeline unit is controlled.

In the thermoelectric precooling system for power batteries provided in the embodiment of the present invention, the first cooling fluid is water, the second cooling fluid is ferromagnetic fluid, and the percentage range of ferromagnetic solid particles in the second cooling fluid is 0.005 % to 0.015%.

In the thermoelectric pre-cooling system for a power battery provided in the embodiment of the present invention, the pipelines in the first pipeline unit and the second pipeline unit are of serpentine flow channel structure.

In the thermoelectric precooling system for power batteries provided by the embodiment of the present invention, both the air cooling module and the thermoelectric cooling module are used to reduce the operating temperature of the battery module to a preset range, and the preset range is 20 degrees Celsius to 40 degrees Celsius .

The beneficial effects of the present invention are: different from the situation of the prior art, the present invention provides a thermoelectric precooling system for power batteries, including a battery module, an air-cooled module connected to the battery module, and an air-cooled module connected to the air-cooled module. A thermoelectric cooling module, the air-cooling module includes an air-cooled radiator and a first cooling fluid, and the air-cooled radiator is used for cooling the first cooling fluid for the first time, wherein the thermoelectric cooling module includes a first pipeline unit and a semiconductor refrigerator , the heat-absorbing end of the semiconductor refrigerator is in contact with the first pipeline unit, the first pipeline unit is used to deliver the first cooling fluid to the battery module, and the heat-absorbing end of the semiconductor refrigerator is used for performing the first cooling fluid on the first cooling fluid. Secondary cooling treatment: the above-mentioned thermoelectric pre-cooling system for power batteries performs the first cooling treatment on the first cooling fluid through the air-cooled radiator in the air-cooled module, and then passes through the heat-absorbing end of the semiconductor cooler in the thermoelectric cooling module The second cooling treatment is performed on the first cooling fluid, so that the first cooling fluid that has undergone two cooling treatments performs heat exchange treatment on the battery module, so that the working temperature of the battery module is cooled to an appropriate temperature, thereby improving the performance of the battery module. electrical properties.

Description of drawings

Fig. 1 is a working principle diagram of a thermoelectric precooling system for a power battery provided by an embodiment of the present invention;

Fig. 2 is a block diagram of a fluid cooling unit in a thermoelectric precooling system for a power battery provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a thermoelectric cooling module in a thermoelectric precooling system for a power battery provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of the first pipeline unit or the second pipeline unit in the thermoelectric cooling module provided by the embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view at A1A2 of FIG. 4 .

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Referring to FIGS. 1 to 5 , the present invention provides a thermoelectric precooling system 100 for power batteries, including a battery module 10 , an air cooling module 20 connected to the battery module 10 and a thermoelectric cooling module connected to the air cooling module 20 Module 30, the air-cooled module 20 includes an air-cooled radiator 21 and a first cooling fluid, and the air-cooled radiator 21 is used to perform a first cooling treatment on the first cooling fluid;

Wherein, the thermoelectric cooling module 30 includes a first pipeline unit 31 and a semiconductor refrigerator 33, the heat absorption end 331 of the semiconductor refrigerator 33 is in contact with the first pipeline unit 31, and the first pipeline unit 31 is used to cool the first The fluid is delivered to the battery module 10 , and the heat-absorbing end 331 of the semiconductor cooler 33 is used to perform a second cooling treatment on the first cooling fluid.

The above-mentioned thermoelectric precooling system 100 for power batteries performs the first cooling treatment on the first cooling fluid through the air-cooled radiator 21 in the air-cooled module 20 , and then passes through the heat-absorbing end of the semiconductor cooler 33 in the thermoelectric cooling module 30 331 performs a second cooling treatment on the first cooling fluid, so that the first cooling fluid that has undergone two cooling treatments performs heat exchange treatment on the battery module 10, so that the working temperature of the battery module 10 is cooled to an appropriate temperature, thereby improving the Electrical performance of the battery module 10 .

The technical solution of the present application will now be described in conjunction with specific embodiments.

Please refer to Fig. 1 to Fig. 5, Fig. 1 is a working principle diagram of a thermoelectric pre-cooling system 100 for a power battery provided by an embodiment of the present invention; Fig. 2 is a thermoelectric pre-cooling system for a power battery provided by an embodiment of the present invention A schematic diagram of the module of the fluid cooling unit 40 in 100; FIG. 3 is a schematic structural diagram of the thermoelectric cooling module 30 in the thermoelectric precooling system 100 for power batteries provided by the embodiment of the present invention; FIG. 4 is a thermoelectric cooling module provided by the embodiment of the present invention 30 is a schematic structural view of the first pipeline unit 31 or the second pipeline unit 32; FIG. 5 is a schematic cross-sectional view at A1A2 in FIG. 4 .

Specifically, referring to FIG. 1, a thermoelectric precooling system 100 includes a battery module 10, an air cooling module 20 connected to the battery module 10, and a thermoelectric cooling module 30 connected to the air cooling module 20, and the air cooling module 20 includes an air cooling radiator 21 and the first cooling fluid, the air-cooled radiator 21 is used to perform the first cooling treatment on the first cooling fluid;

Wherein, the thermoelectric cooling module 30 includes a first pipeline unit 31 and a semiconductor refrigerator 33, the heat absorption end 331 of the semiconductor refrigerator 33 is in contact with the first pipeline unit 31, and the first pipeline unit 31 is used to cool the first The fluid is delivered to the battery module 10 , and the heat-absorbing end 331 of the semiconductor cooler 33 is used to perform a second cooling treatment on the first cooling fluid.

In the embodiment of the present invention, the battery module 10 can be used as a power battery of an electric vehicle, and the battery module 10 can be a flow battery.

In the embodiment of the present invention, a semiconductor refrigerator 33 (Thermoelectric cooler) refers to a device that utilizes the Peltier effect of semiconductor materials to obtain cold energy, and is also called a thermoelectric cooler. Connect two pieces of different metals with a conductor, connect direct current, then the temperature at one junction will drop, and the temperature at the other junction will rise; semiconductor refrigerator 33 is used between the first pipeline unit 31 and the second pipeline unit 32 heat exchange.

In the embodiment of the present invention, the air-cooled module 20 further includes a coolant expansion tank 22 and an electric coolant pump 23 connected to the coolant expansion tank 22, the outlet of the coolant expansion tank 22 is connected to the air-cooled radiator 21, and the coolant The inlet of the expansion tank 22 is connected to the battery module 10;

Wherein, the coolant expansion tank 22 is used for storing the first cooling fluid, and the electric coolant pump 23 is used for pumping the first cooling fluid out of the coolant expansion tank 22 .

Specifically, referring to FIGS. 3 to 5 , the thermoelectric cooling module 30 further includes a second pipeline unit 32 that is not connected to the first pipeline unit 31 , and the second pipeline unit 32 is connected to the heat release end 332 of the semiconductor refrigerator 33 contact;

Wherein, the second pipeline unit 32 is used to transport the second cooling fluid, and the second cooling fluid is used to serve as the coolant of the heat release end 332 of the semiconductor refrigerator 33; The two pipeline units 32 are in contact, and the heat absorption end 331 of the semiconductor refrigerator 33 is in contact with the first pipeline unit 31 .

Further, referring to FIG. 3 , the thermoelectric cooling module 30 further includes a heat conduction plate 34 , and the heat conduction plate 34 is disposed between the heat absorption end 331 of the semiconductor cooler 33 and the heat release end 332 of the semiconductor cooler 33 ;

Wherein, the heat conduction plate 34 is used to improve the heat conduction capacity between the second pipeline unit 32 and the first pipeline unit 31 .

Referring to FIG. 1 , the thermoelectric precooling system 100 also includes a fluid cooling unit 40 connected to the second pipeline unit 32 and a power unit 50 connected to the fluid cooling unit 40 ;

Wherein, the fluid cooling unit 40 is used for cooling the heat release end 332 of the semiconductor refrigerator 33 , and the power unit 50 is used for pumping the second cooling fluid from the fluid cooling unit 40 .

Specifically, the power unit 50 includes a magnetic pump 51 and a peristaltic pump 52. The magnetic pump 51 is used to control the continuous flow of the second cooling fluid in the second pipeline unit 32. The peristaltic pump 52 is used to control the flow of the second cooling fluid in the second pipeline unit 32. The circuit unit 32 pulses the flow.

Please refer to FIG. 2, the fluid cooling unit 40 includes a fluid storage tank 41 and a current device 42, the fluid storage tank 41 is used to store the second cooling fluid, and the current generated by the current device 42 is used to provide a magnetic field in the fluid storage tank 41;

In an embodiment of the present invention, the first cooling fluid is water, the second cooling fluid is ferromagnetic fluid, and the percentage of ferromagnetic solid particles in the second cooling fluid ranges from 0.005% to 0.015%;

Among them, ferrofluid is a new type of functional material, which has both the fluidity of liquid and the magnetism of solid magnetic materials. It is a stable colloidal liquid formed by mixing magnetic solid particles with a diameter of nanometers (below 10 nanometers), a basic fluid (also called a medium) and a surfactant. The fluid has no magnetic attraction when it is static, and it shows magnetism when an external magnetic field is applied.

Further, the relationship between the thermal conductivity of ferrofluid and the concentration satisfies the following formula:

为第二冷却流体中铁磁性固体颗粒的百分含量比。where _kw is the thermal conductivity of the base fluid, _kp is the thermal conductivity of ferromagnetic solid particles, _knf is the thermal conductivity of ferromagnetic fluid,

is the percentage of ferromagnetic solid particles in the second cooling fluid.

越大，铁磁流体的导热系数k_nf越小，不易于导热。所以，一定浓度的铁磁流体的冷却效果较好，优选为0.005％～0.015％。Specifically, it can be seen from the above formula that under certain conditions, the concentration of ferrofluid

The larger , the smaller the thermal conductivity k _nf of ferrofluid, and it is not easy to conduct heat. Therefore, a certain concentration of ferrofluid has a better cooling effect, preferably 0.005% to 0.015%.

Further, when the current device 42 generates a current, there is a magnetic field in the fluid storage tank 41, and the ferrofluid in the fluid storage tank 41 has the same magnetic moment orientation under the action of the magnetic field, the magnetic entropy decreases, and the ferrofluid releases outward. heat, the temperature is lowered, and then it can serve as a coolant for the heat release end 332 of the peltier cooler 33 in the thermoelectric cooling module 30 .

At the same time, the ferrofluid behaves without the action of the magnetic field: the magnetic moment changes from order to disorder along the direction of the magnetic field, the magnetic entropy increases, and heat is absorbed from the outside. In this way, the ferrofluid acts as a cooling agent to meet the needs of secondary cooling.

In the embodiment of the present invention, the pipeline outlet 302 of the first pipeline unit 31 or the pipeline inlet 301 of the second pipeline unit 32 is not on the same side; the pipes in the first pipeline unit 31 and the second pipeline unit 32 The roads are all serpentine runner structures, as shown in Figure 4 and Figure 5. Wherein, the above-mentioned design can increase the flow paths of the first cooling fluid or the second cooling fluid, thereby enabling the first pipeline unit 31 and the second pipeline unit 32 to obtain better heat dissipation capabilities.

In the embodiment of the present invention, both the air cooling module 20 and the thermoelectric cooling module 30 are used to reduce the operating temperature of the battery module 10 to a preset range, and the preset range is 20 degrees Celsius to 40 degrees Celsius. Among them, when the temperature of the battery module 10 is greater than 40 degrees Celsius, thermal runaway may occur, which will not only shorten the service life of the power battery, but also pose a threat to the safety of the vehicle; when the temperature of the battery module 10 is lower than 20 degrees Celsius, the battery module 10 Therefore, effective management of battery heat is crucial to improve the range and safety of electric vehicles.

Referring to Figures 1 to 5, the working process of the thermoelectric precooling system 100 for power batteries provided by the present invention is as follows:

When the battery module 10 is working normally, the electric coolant pump 23 pumps the first cooling fluid out of the coolant expansion tank 22. After the first cooling fluid is cooled by the air-cooled radiator 21 for the first time, it is then subjected to thermoelectric cooling. The first pipeline unit 31 of the module 30 exchanges heat with the heat-absorbing end 331 of the semiconductor refrigerator 33 to perform second cooling. The first cooling fluid flows out through the first pipeline unit 31 and then flows through the battery module 10 to cooling the battery module 10;

At the same time, the second cooling fluid in the fluid storage tank 41 is under the influence of the magnetic field generated by the current from the current device 42, the orientation of the magnetic moment of the ferromagnetic substance in the second cooling fluid tends to be consistent gradually, and the magnetic moment From disorder to order along the direction of the magnetic field, the magnetic entropy decreases, the temperature of the second cooling fluid decreases and flows through the second pipeline unit 32 of the thermoelectric cooling module 30 to exchange heat with the heat release end 332 of the semiconductor refrigerator 33, Then it is stored in the fluid storage tank 41 ; wherein, the continuous flow of the second cooling fluid in the second pipeline unit 32 is completed by the magnetic pump 51 , and the pulse flow is completed by the peristaltic pump 52 .

In the embodiment of the present invention, the thermoelectric pre-cooling system 100 includes a cold-side fluid circuit and a hot-side fluid circuit, and the cold-side fluid circuit includes the battery module 10, the air-cooled module 20 and the first pipeline unit 31 in the thermoelectric cooling module 30, The hot side fluid circuit includes the second pipeline unit 32 in the thermoelectric cooling module 30 , the fluid cooling unit 40 and the power unit 50 connected to the fluid cooling unit 40 .

In the embodiment of the present invention, the heat exchange process of the entire thermoelectric cooling module 30 is as follows: the heat-absorbing end 331 of the semiconductor cooler 33 is used to cool the first cooling fluid flowing through the first pipeline unit 31, and the heat-absorbing end 331 of the semiconductor cooler 33 The heat release end 332 is cooled by the second cooling fluid flowing through the second pipeline unit 32 .

The present invention mainly adopts two times of liquid cooling technology to cool the battery module 10, and through the combination of the air-cooled radiator 21 and thermoelectric cooling, the first cooling fluid that needs to be used to cool the battery module 10 is cooled twice, reducing the amount of fluid entering the battery. The temperature of the module 10 increases the cooling capacity of the first cooling fluid.

In view of the deficiencies of the existing battery thermal management technology, such as the large proportion of heat dissipation structure space, low heat dissipation efficiency, and poor cooling effect, the present invention provides a ferrofluid using the principle of magnetocaloric effect as a coolant, a liquid A thermoelectric pre-cooling system 100 for power batteries that combines cold and thermoelectric cooling, with air-cooled radiator 21 as auxiliary heat dissipation, compact structure, safe and reliable, good heat dissipation capacity, and high efficiency. Due to the magnetic refrigeration technology based on the magnetocaloric effect, it has the advantages of high efficiency, low noise and low vibration.

In summary, different from the situation of the prior art, the present invention has the following beneficial effects:

The first cooling fluid in the cold-side fluid circuit in the thermoelectric pre-cooling system 100 for power batteries provided by the present invention passes through the semiconductor refrigerator 33 in the thermoelectric cooling module 30 after being cooled once by the air-cooled radiator 21 The heat-absorbing end 331 is cooled for the second time, so that the temperature of the first cooling fluid flowing into the battery module 10 is lower and the cooling effect is better; while the hot-side fluid circuit in the thermoelectric cooling module 30 uses ferrofluid as the coolant, The cooling process of the two loops is safe and reliable with high cooling efficiency.

Specifically, firstly, liquid cooling has an impact on the heat removal performance of the battery module 10 , reduces heat accumulation inside the battery module 10 , and increases the safety of the battery system. Secondly, the hot-side fluid circuit uses a certain concentration of ferrofluid as the cooling liquid. Under the action of the magnetic field, the principle of the magneto-caloric effect is used to reduce its own temperature, which enhances the cooling effect, and can better conduct heat in the thermoelectric cooling module 30. exchange. Again, the air-cooled radiator 21 is used to cool the first cooling fluid in the cold-side fluid circuit. Finally, the liquid cooling effect is related to the temperature flowing into the battery module 10. The lower the temperature, the better the cooling effect. After the first cooling fluid is cooled twice, the cooling effect is better, and the temperature of the battery module 10 will be lower, which improves performance.

It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own emphasis. For details not described in individual embodiments, reference may be made to the descriptions in other embodiments.

The above examples only express the implementation manner of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. A thermoelectric precooling system for power batteries, characterized in that the thermoelectric precooling system includes a battery module, an air cooling module connected to the battery module, and a thermoelectric cooling module connected to the air cooling module , the air-cooled module includes an air-cooled radiator and a first cooling fluid, and the air-cooled radiator is used to perform a first cooling treatment on the first cooling fluid; Wherein, the thermoelectric cooling module includes a first pipeline unit and a semiconductor refrigerator, the heat absorption end of the semiconductor refrigerator is in contact with the first pipeline unit, and the first pipeline unit is used to The first cooling fluid is delivered to the battery module, and the heat-absorbing end of the semiconductor cooler is used to perform a second cooling treatment on the first cooling fluid. 2. The thermoelectric precooling system for power batteries according to claim 1, wherein the air-cooled module further comprises a coolant expansion tank and an electric coolant pump connected to the coolant expansion tank, so The outlet of the coolant expansion tank is connected to the air-cooled radiator, and the inlet of the coolant expansion tank is connected to the battery module; Wherein, the coolant expansion tank is used to store the first cooling fluid, and the electric coolant pump is used to pump the first cooling fluid out of the coolant expansion tank. 3. The thermoelectric pre-cooling system for power batteries according to claim 1, wherein the thermoelectric cooling module further comprises a second pipeline unit that is not connected to the first pipeline unit, and the first pipeline unit is The second pipeline unit is in contact with the exothermic end of the semiconductor refrigerator; Wherein, the second pipeline unit is used for transporting a second cooling fluid, and the second cooling fluid is used as a coolant for a heat release end of the semiconductor refrigerator. 4. The thermoelectric pre-cooling system for power batteries according to claim 3, wherein the thermoelectric cooling module further comprises a heat conduction plate, and the heat conduction plate is arranged between the heat-absorbing end of the semiconductor refrigerator and the between the exothermic ends of the semiconductor refrigerator; Wherein, the heat conduction plate is used to improve the heat conduction capacity of the second pipeline unit and the first pipeline unit and the heat conduction capacity of the hot end cooling unit. 5. The thermoelectric precooling system for power batteries according to claim 3, characterized in that, the thermoelectric precooling system further comprises a fluid cooling unit connected to the second pipeline unit and a fluid cooling unit connected to the fluid cooling unit. power unit to which the unit is connected; Wherein, the fluid cooling unit is used to cool the heat release end of the semiconductor refrigerator, and the power unit is used to pump the second cooling fluid from the fluid cooling unit. 6. The thermoelectric precooling system for power batteries according to claim 5, wherein the fluid cooling unit includes a fluid storage tank and a current device, and the fluid storage tank is used to store the second cooling fluid , the electrical current generated by the current means is used to provide a magnetic field in the fluid storage tank. 7. The thermoelectric precooling system for a power battery according to claim 5, wherein the power unit includes a magnetic pump and a peristaltic pump, and the magnetic pump is used to control the flow of the second cooling fluid in the The second pipeline unit flows continuously, and the peristaltic pump is used to control the pulse flow of the second cooling fluid in the second pipeline unit. 8. The thermoelectric precooling system for power batteries according to claim 3, wherein the first cooling fluid is water, the second cooling fluid is ferrofluid, and iron in the second cooling fluid The percentage ratio of the magnetic solid particles ranges from 0.005% to 0.015%. 9 . The thermoelectric precooling system for power batteries according to claim 3 , wherein the pipelines in the first pipeline unit and the second pipeline unit are of serpentine flow channel structure. 10 . 10. The thermoelectric pre-cooling system for power batteries according to claim 1, wherein the air cooling module and the thermoelectric cooling module are both used to reduce the operating temperature of the battery module to a preset range Within, the preset range is 20 degrees Celsius to 40 degrees Celsius.

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