A method for converting a dehumidification system of a secondary circuit thermal management system for an energy storage device into a series dehumidification system

Abstract

The present invention relates to a method for converting a parallel dehumidification system of a secondary circuit thermal management system for an energy storage device into a series dehumidification system. The method comprises a compressor, a water-cooled condenser, an EXV, a chiller, a fan, a heat dissipation water tank, two four-way water valves, two electronic water pumps, and a dehumidification module. The battery is arranged in a battery cabinet, the fan is arranged on the heat dissipation water tank, and the compressor, water-cooled condenser, EXV, chiller, and compressor are sequentially connected to form a refrigerant circulation loop; the dehumidification module is connected to the dehumidification channel of the battery cabinet to improve the temperature and humidity environment of the battery cabinet and increase its operating efficiency and service life. The method arranges the dehumidification module on the thermal management system in series or parallel, so that the humid air is dried by passing through the dehumidification module of the thermal management system unit. The method has a simple structure, saves energy consumption, and effectively improves the degree of air dryness.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump experiments, and in particular to a method for converting a dehumidification system of a secondary circuit thermal management system used in an energy storage device into a series dehumidification system. Background Art

[0002] Current battery thermal management systems for electric vehicles or energy storage systems using heat pump systems have two basic operating modes: heat pump mode and cooling mode. In heat pump mode, the refrigerant absorbs heat from the outside environment through an outdoor heat exchanger, then exchanges the heat to the coolant through a liquid-cooled condenser, ultimately providing the heat to the battery cabinet. In cooling mode, the battery cabinet transfers heat through the coolant to the refrigerant in the battery heat exchanger, which then releases the heat to the outside environment through the outdoor heat exchanger. The heat pump and cooling modes of battery thermal management maintain the battery's operating temperature, thereby ensuring efficient charging and discharging and ensuring a long battery life.

[0003] With the rapid development of energy storage technology, the energy density of energy storage batteries is increasing. However, they still require a certain temperature environment to operate efficiently. Excessively high or low ambient temperatures can severely reduce the battery's service life and pose serious safety risks. Therefore, highly efficient battery thermal management systems have become a key development direction for energy storage technology. Liquid cooling thermal management technology, with its advantages of high heat dissipation efficiency and precise temperature control, has gradually become a mainstream solution. However, liquid cooling units generally lack active dehumidification capabilities. Long-term exposure to environmental influences in battery cabinets can cause condensation, which can easily cause internal wiring short circuits and accelerate corrosion of the cold plate, affecting the normal operation of the batteries.

[0004] To address the dehumidification problem in liquid-cooled units, existing technologies typically place desiccants or absorbent materials inside the battery cabinet. However, this method loses its effectiveness once the absorbent material becomes saturated. Some manufacturers incorporate an additional dehumidifier within the system to perform dehumidification, but this approach not only increases equipment costs but also produces suboptimal dehumidification results.

[0005] Therefore, there is an urgent need to design a secondary circuit thermal management system with dehumidification function for energy storage devices to meet market demand. Summary of the Invention

[0006] In order to overcome the shortcomings of the existing technology, optimize the dehumidification effect, improve the temperature and humidity environment of the battery cabinet, and increase its operating efficiency and service life. The purpose of the present invention is to provide a series dehumidification system for a secondary circuit thermal management system of an energy storage device, comprising a compressor, a water-cooled condenser, an EXV, a chiller, an evaporator and a fan, a heat dissipation water tank, a four-way water valve, and an electronic water pump. The battery is arranged in the battery cabinet, and the fan is arranged on the heat dissipation water tank.

[0007] The compressor, water-cooled condenser, EXV, Chiller and compressor are connected in sequence to form a first refrigerant circuit;

[0008] The four ports of the four-way water valve are respectively connected to the coolant port of the battery cabinet, the coolant port of the water-cooled condenser, the coolant port of the chiller and the inlet and outlet of the electronic water pump;

[0009] The four ports of the four-way water valve are respectively connected to the coolant port of the water-cooled condenser, the inlet and outlet of the electronic water pump, the coolant port of the chiller and the coolant port of the radiator;

[0010] The inlet and outlet of the electronic water pump are respectively connected to the coolant port of the radiator water tank and the four-way water valve;

[0011] The inlet and outlet of the electronic water pump are respectively connected to the coolant port and the four-way water valve of the battery cabinet;

[0012] A dehumidification module is also provided, including an evaporator and a fan, which is arranged between the EXV and the Chiller and forms part of the refrigerant circulation circuit;

[0013] It is also connected to a dehumidification channel of the battery cabinet, which is composed of the battery cabinet and the evaporator. The fan is arranged in the dehumidification channel and blows air toward the surface of the evaporator.

[0014] Furthermore, in cooling mode, when the battery cabinet needs cooling, the system enters cooling mode. The refrigerant circuit: the refrigerant is pressurized by the compressor and enters the water-cooled condenser. After transferring heat to the coolant in the water-cooled condenser, the refrigerant flows into the EXV for throttling and pressure reduction. It then enters the evaporator and chiller to absorb heat from the coolant in the chiller and evaporator. The refrigerant then enters the compressor for further pressurization, thus completing the refrigerant cycle.

[0015] Coolant circuit: The coolant heated in the water-cooled condenser enters the electronic water pump through the four-way water valve, and then enters the radiator through the electronic water pump. The radiator and the fan transfer heat to the outside air, and the cooled coolant then enters the water-cooled condenser through the four-way water valve to absorb heat.

[0016] The coolant cooled in the chiller flows through a four-way water valve into the electronic water pump, and then flows into the battery cabinet through the electronic water pump to dissipate heat from the battery cabinet. After absorbing heat, the coolant flows out of the battery cabinet, flows through the four-way water valve into the chiller, and is cooled by the refrigerant.

[0017] Dehumidification circuit: The high-temperature and high-humidity air pumped from the battery cabinet is cooled and dehumidified by the evaporator of the dehumidification module, and then the air is dried by the fan and sent to the battery cabinet.

[0018] Furthermore, in heating mode, when the battery cabinet needs to be heated, the thermal management system enters heat pump mode;

[0019] Coolant circuit: The coolant that absorbs heat in the water-cooled condenser enters the electronic water pump through a four-way water valve, flows into the battery cabinet through the electronic water pump to heat the battery cabinet, and then the coolant that releases heat flows from the battery cabinet through the four-way water valve into the water-cooled condenser to absorb heat.

[0020] The cooled coolant in the chiller enters the radiator through a four-way valve. The low-temperature coolant absorbs heat from the outside air through the radiator and the fan. After absorbing the heat, the coolant enters the four-way valve through an electronic water pump, and then enters the chiller through the four-way valve to transfer the heat to the refrigerant.

[0021] Dehumidification circuit: The high-temperature and high-humidity air pumped from the battery cabinet is cooled and dehumidified by the evaporator of the dehumidification module, and then the air is dried by the fan and sent to the battery cabinet.

[0022] Furthermore, it also includes a natural air cooling mode. When the battery cabinet has a heat dissipation demand and the external ambient temperature is relatively suitable, the thermal management system enters the natural air cooling mode, and the refrigerant side does not work at this time;

[0023] Coolant circuit: The coolant flowing out of the battery cabinet flows through the four-way water valve into the chiller, then flows through the four-way water valve into the heat dissipation water tank. The heat dissipation water tank and the fan transfer heat to the outside air. The cooled coolant passes through the electronic water pump and the four-way water valve and flows into the water-cooled condenser. It then passes through the four-way water valve into the electronic water pump and finally flows into the battery cabinet. The coolant absorbs heat from the battery cabinet before flowing out.

[0024] Alternatively, the coolant flowing out of the battery cabinet flows through the four-way water valve into the water-cooled condenser, then flows through the four-way water valve into the heat dissipation water tank. The heat is transferred to the outside air through the heat dissipation water tank and the fan. The cooled coolant flows through the electronic water pump and the four-way water valve into the chiller, then through the four-way water valve into the electronic water pump and finally into the battery cabinet. The coolant absorbs heat from the battery cabinet before flowing out.

[0025] Alternatively, the coolant flowing out of the battery cabinet flows through the four-way water valve and the electronic water pump before entering the heat dissipation water tank. The heat is transferred to the outside air through the heat dissipation water tank and the fan. The cooled coolant flows through the four-way water valve and then flows into the electronic water pump and finally into the battery cabinet. The coolant absorbs heat from the battery cabinet before flowing out.

[0026] Alternatively, a fan is provided near the water-cooled condenser and chiller and blows directly towards the water-cooled condenser and chiller;

[0027] Dehumidification circuit: The high-temperature and high-humidity air pumped from the battery cabinet is cooled and dehumidified by the evaporator of the dehumidification module, and then the air is dried by the fan and sent to the battery cabinet.

[0028] A parallel dehumidification system for a secondary circuit thermal management system of an energy storage device includes the same components and connection methods as a series dehumidification system for a secondary circuit thermal management system of an energy storage device. On this basis,

[0029] A parallel second refrigerant circuit is also provided, and the compressor, water-cooled condenser, EXV, evaporator and fan are connected in sequence to form the parallel second refrigerant circuit.

[0030] Furthermore, in the cooling mode, the refrigerant circuit: the refrigerant is pressurized by the compressor and enters the water-cooled condenser. After transferring the heat to the coolant in the water-cooled condenser, the refrigerant flows into the first and second refrigerant circuits respectively; in the first and second refrigerant circuits, it passes through EXV and throttling to reduce the pressure, and then enters the chiller and evaporator respectively to absorb the heat of the coolant in the chiller and evaporator. Then the refrigerant in the chiller and evaporator enters the compressor and is pressurized again, thus completing the circulation on the refrigerant side.

[0031] Furthermore, in the heating mode, when the battery cabinet needs to be heated, the thermal management system enters the heat pump mode.

[0032] Furthermore, in the natural air cooling mode, when the battery cabinet has a heat dissipation demand and the external ambient temperature is relatively suitable, the thermal management system enters the natural air cooling mode, and the refrigerant side does not work at this time.

[0033] Furthermore, the refrigerant circuit also includes a liquid storage tank, which is arranged between the water-cooled condenser and the EXV.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows: the purpose of the present invention is to provide a working method of a series-connected dehumidification system for a secondary circuit thermal management system of an energy storage device, wherein the thermal management system housing and the battery cabinet housing form an air duct isolated from the outside world; an air inlet and an air outlet for humid air are provided on the thermal management system, and through logical judgment, when the dehumidification mode needs to be turned on, the fan draws in the humid air in the battery cabinet, and after drying by the evaporator of the dehumidification module, the dry air is sent back to the battery cabinet.

[0035] The method arranges the dehumidification module on the thermal management system in series or parallel, so that the humid air is dried by the dehumidification module of the thermal management system unit. The method has a simple structure, saves energy consumption, and effectively improves the air drying degree.

[0036] During the natural cooling process, two four-way water valves and two electric water pumps cleverly connect the water-cooled condenser and chiller (with or without fans) as piping (compared to a system without water-cooled condensers and chillers), allowing the coolant to dissipate heat naturally. Natural cooling originally relied solely on a heat sink and fan, but the addition of a water-cooled condenser and chiller effectively adds two additional heat sinks and fans. This cleverly utilizes the structural characteristics of the water-cooled condenser and chiller, which are characterized by their large surface area. Even without refrigerant, the coolant, operating on the outer surface and coupled with the fan (or lack thereof), maintains extensive contact with the refrigerant, which is not flowing internally. Because the coolant is at medium temperature, and the refrigerant is always lower in temperature than the medium-temperature coolant, even when the refrigerant is not flowing, the medium-temperature coolant flowing through the water-cooled condenser and chiller still exchanges heat with the refrigerant inside. Therefore, through the guiding role of water pumps and water valves, the cooling effect is improved without adding new equipment and new energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a system diagram of the present invention in series mode.

[0038] Figure 2 It is a system diagram of the present invention in parallel mode. DETAILED DESCRIPTION

[0039] Example

[0040] In cooling mode, when the battery cabinet 16 needs to cool, the system enters cooling mode. The refrigerant circuit: the refrigerant is pressurized by compressor 1 and enters the water-cooled condenser 2. After transferring heat to the coolant in the water-cooled condenser 2, the refrigerant flows into EXV3 for throttling and pressure reduction. It then enters the evaporator 15 and chiller 4 to absorb heat from the coolant in the chiller 4 and evaporator 15. The refrigerant then enters compressor 1 to be pressurized again, completing the refrigerant cycle.

[0041] Coolant circuit: The coolant heated in the water-cooled condenser 2 enters the electronic water pump 9 through the four-way water valve 7, and then enters the heat dissipation water tank 6 through the electronic water pump 9. The medium-temperature coolant transfers heat to the outside air through the heat dissipation water tank 6 and the fan 5. The cooled coolant then enters the water-cooled condenser 2 through the four-way water valve 8 to absorb heat.

[0042] The coolant cooled in Chiller 4 passes through the four-way water valve 8 and enters the electronic water pump 10. Then, it flows into the battery cabinet 16 through the electronic water pump 10 to dissipate heat from the battery cabinet 16. After absorbing the heat, the coolant flows out of the battery cabinet 16, passes through the four-way water valve 7, and enters Chiller 4 to be cooled by the refrigerant.

[0043] In heating mode, when the battery cabinet 16 has a heating demand, the thermal management system enters heat pump mode;

[0044] Coolant circuit: The coolant that absorbs heat in the water-cooled condenser 2 enters the electronic water pump 10 through the four-way water valve 8, flows into the battery cabinet 16 through the electronic water pump 10 to heat the battery cabinet 16, and then the coolant that has released heat flows from the battery cabinet 16 through the four-way water valve 7 into the water-cooled condenser 2 to absorb heat.

[0045] The cooled coolant in Chiller 4 enters the heat dissipation water tank 6 through the four-way water valve 8. The low-temperature coolant absorbs heat from the outside air through the action of the heat dissipation water tank 6 and the fan 5. The coolant after absorbing the heat then enters the four-way water valve 7 through the electronic water pump 9, and then enters Chiller 4 through the four-way water valve 7 to transfer the heat to the refrigerant.

[0046] Natural air cooling mode: When the battery cabinet 16 needs to dissipate heat and the ambient temperature is relatively suitable (for example, 15°C-20°C), the thermal management system enters natural air cooling mode, and the refrigerant side does not work;

[0047] Coolant circuit: The medium-temperature coolant flowing out of the battery cabinet 16 flows through the four-way water valve 7 into the chiller 4, then flows through the four-way water valve 8 and enters the heat dissipation water tank 6. The medium-temperature coolant transfers heat to the outside air through the heat dissipation water tank 6 and the fan 5. The cooled coolant flows through the electronic water pump 9 and the four-way water valve 7, then flows into the water-cooled condenser 2, then passes through the four-way water valve 8 and enters the electronic water pump 10, and finally flows into the battery cabinet 16. The coolant absorbs heat from the battery cabinet 16 before flowing out.

[0048] Alternatively, the medium-temperature coolant flowing out of the battery cabinet 16 flows through the four-way water valve 7 into the water-cooled condenser 2, then flows through the four-way water valve 8 and enters the heat dissipation water tank 6. The medium-temperature coolant transfers heat to the outside air through the heat dissipation water tank 6 and the fan 5. The cooled coolant flows through the electronic water pump 9 and the four-way water valve 7 and then flows into the chiller 4. Then, it passes through the four-way water valve 8 and enters the electronic water pump 10 and finally flows into the battery cabinet 16. The coolant absorbs heat from the battery cabinet 16 before flowing out.

[0049] Alternatively, the medium-temperature coolant flowing out of the battery cabinet 16 flows through the four-way water valve 7 and the electronic water pump 9 before entering the heat dissipation water tank 6. The medium-temperature coolant transfers heat to the outside air through the heat dissipation water tank 6 and the fan 5. The cooled coolant passes through the four-way water valve 8 and enters the electronic water pump 10 and finally flows into the battery cabinet 16. The coolant absorbs heat from the battery cabinet 16 before flowing out.

[0050] The high-temperature, high-humidity air from battery cabinet 1 is cooled and dehumidified by evaporator 15, dried by fan 14, and then transported back to battery cabinet 16. Fan 14 is located in the dehumidified air duct between battery cabinet 16 and evaporator 15, blowing air toward the surface of evaporator 15. This serves to force air circulation, drawing the high-temperature air from battery cabinet 16 through the duct to evaporator 15. Furthermore, because the duct is arranged in a loop, fan 14 creates a driving force for forced air circulation within the duct. This allows for forced drawing of high-temperature air from battery cabinet 16 through the duct to evaporator 15, while also forcibly blowing dry, low-temperature air from evaporator 15 into battery cabinet 16. On the other hand, the high-temperature air pumped from the battery cabinet 16 is first cooled down by the refrigerant inside the evaporator 15 at the evaporator 15. After the high-humidity air is cooled down, the water content decreases, and water droplets are formed on the surface of the evaporator 15 in the air. Then, under the external force of the fan 14, the water droplets are blown off the surface of the evaporator 15 before they are completely reintegrated into the air, and are collected by the water collection tray at the bottom of the evaporator 15 (the evaporator generally has a water collection tray, but the water droplets on the surface of the ordinary evaporator fall to the water collection tray by gravity, and the speed is relatively slow. The water droplets are easily reintegrated into the air, resulting in a poor dehumidification effect). Thirdly, the fan 14 blows the evaporator 15, which speeds up the heat exchange between the refrigerant in the evaporator 15 and the high-temperature and high-humidity air on the surface of the evaporator 15, and speeds up the heat exchange rate between the wet air and the refrigerant (because the refrigerant is forced to run inside the evaporator 15 by the compressor 1, and the wet air is forced to run in the dehumidification pipe by the fan 14, and the contact time between the two is limited, and it is necessary to maximize heat exchange within the limited time, so the fan 14 blows air towards the surface of the evaporator 15, which speeds up the heat exchange rate between the two, enhances the heat exchange efficiency of the evaporator 15, and improves the dehumidification efficiency).

[0051] In this embodiment, the method of connecting the dehumidification module in series with the thermal management system has the following advantages:

[0052] 1. Simplicity: The series design has a simple structure, saving an expansion valve. The arrangement order of each structural unit is clear and easy to install;

[0053] 2. Reliability: During equipment operation, the series connection method is easy to maintain and troubleshoot.

[0054] Example

[0055] Compared with the first embodiment, the second embodiment includes the components and connection methods of the series dehumidification system in the first embodiment, and on this basis,

[0056] A second parallel refrigerant circuit is also provided. The compressor 1, the water-cooled condenser 2, the EXV 13, the evaporator 15 and the fan 14 are sequentially connected to form the second parallel refrigerant circuit.

[0057] In cooling mode, the refrigerant is pressurized by compressor 1 and enters water-cooled condenser 2. After transferring heat to the coolant in water-cooled condenser 2, the refrigerant flows into the first and second refrigerant circuits respectively. In the first and second refrigerant circuits, the refrigerant is throttled and reduced in pressure by EXV3 and 13 respectively, and then enters chiller 4 and evaporator 15 respectively to absorb heat from the coolant in chiller 4 and evaporator 15. The refrigerant in chiller 4 and evaporator 15 then enters compressor 1 to be pressurized again, thus completing the refrigerant cycle.

[0058] The working methods of the coolant circuit and the dehumidification circuit are the same as those in the first embodiment.

[0059] Heating mode: When the battery cabinet 16 needs to be heated, the thermal management system enters the heat pump mode;

[0060] The working methods of the coolant circuit and the dehumidification circuit are the same as those in the first embodiment.

[0061] Natural air cooling mode: When the battery cabinet 16 has a heat dissipation requirement and the ambient temperature is relatively suitable, the thermal management system enters the natural air cooling mode, and the refrigerant side does not work at this time;

[0062] The working methods of the coolant circuit and the dehumidification circuit are the same as those in the first embodiment.

[0063] In this embodiment, the method of connecting the dehumidification module in parallel with the thermal management system has the following advantages:

[0064] 1. Adjustability: The parallel structure design enables independent adjustment of dehumidification and temperature control, facilitating system commissioning and enabling precise temperature and humidity control. Compared to existing technologies, this system can independently control humidity (humid air originates from the battery cabinet 16 and is dehumidified by the evaporator 5) or temperature (the liquid discharged from the battery cabinet 16 returns to the battery cabinet 16 after heat exchange in the chiller 4 or the radiator (including the heat dissipation tank 6 and fan 5).

[0065] 2. Safety: Since the dehumidification module operates independently and has an independent refrigerant system, it will not affect the operation of the thermal management system, and the overall safety is better.

[0066] 3. It is convenient to inspect and repair the internal refrigeration pipeline. Figure 2 As you can see, this thermal management system only requires the second refrigerant circuit to operate in order to dehumidify the battery cabinet 16. Therefore, when the coolant lines need to be repaired, this can be done conveniently in a parallel system (or by temporarily converting a series system to a parallel system—the modification method is discussed below). In this case, the dehumidification of the battery cabinet 16 does not stop for the repair.

[0067] Both of the above methods can simultaneously control humidity and the temperature within the battery cabinet 16. Within the same system structure, the addition of one or more parallel branches can be considered as appropriate. (Since the pipe joints all use three-way or four-way connectors with shutoff functions, simply controlling the closing or opening of certain branches can convert parallel connections to series connections, and vice versa.)

[0068] For example, in this embodiment, closing the parallel branch from evaporator 15 to compressor 1 and EXV 13 and opening the branch from evaporator 15 to chiller 4 and EXV 3 converts the parallel system into a series system. Therefore, this system can conveniently switch between series and parallel operation by closing or opening a three-way or four-way connector, achieving the effect of switching between different systems as needed. For example, switching from a parallel system to a series system can facilitate maintenance and troubleshooting of certain pipelines.

[0069] Since the thermal management system has many pipes and the maintenance work is complicated, a series-parallel structure that can be converted to each other is designed to facilitate maintenance and repair.

Claims

1. A method for converting a parallel dehumidification system of a secondary circuit thermal management system for an energy storage device into a series dehumidification system, comprising a parallel dehumidification system of a secondary circuit thermal management system for an energy storage device, comprising a compressor (1), a water-cooled condenser (2), an EXV (3), a chiller (4), an evaporator (15), a first fan (14), a second fan (5), a heat dissipation water tank (6), first and second four-way water valves (7, 8), and an electronic water pump (9, 10), wherein a battery is arranged in a battery cabinet (16), and the second fan (5) is arranged on the heat dissipation water tank (6); The compressor (1), the water-cooled condenser (2), the EXV (3), the chiller (4) and the compressor (1) are sequentially connected to form a first refrigerant circuit; The four ports of the first four-way water valve (7) are respectively connected to the coolant port of the battery cabinet (16), the coolant port of the water-cooled condenser (2), the coolant port of the chiller (4), and the inlet and outlet of the electronic water pump (9); The four ports of the second four-way water valve (8) are respectively connected to the coolant port of the water-cooled condenser (2), the inlet and outlet of the electronic water pump (10), the coolant port of the chiller (4) and the coolant port of the heat dissipation water tank (6); The inlet and outlet of the electronic water pump (9) are respectively connected to the coolant port of the heat dissipation water tank (6) and the first four-way water valve (7); The inlet and outlet of the electronic water pump (10) are respectively connected to the coolant port of the battery cabinet (16) and the second four-way water valve (8); A dehumidification module is also provided, comprising an evaporator (15) and a first fan (14), which is arranged between the EXV (3) and the chiller (4) and forms part of a refrigerant circulation circuit; It is also connected to a dehumidification channel of the battery cabinet (16), the dehumidification channel consisting of the battery cabinet (16) and the evaporator (15), and the first fan (14) is arranged in the dehumidification channel and blows air toward the surface of the evaporator (5); A parallel second refrigerant circuit is also provided, wherein the compressor (1), the water-cooled condenser (2), the EXV (13), the evaporator (15) and the first fan (14) are sequentially connected to form the parallel second refrigerant circuit; Its characteristics are: A multi-way valve with a shut-off function is provided at the front and rear ends of the evaporator (15), and is connected to the chiller (4), the compressor (1), and the EXV (3, 13) respectively. The parallel branch from the evaporator (15) to the compressor (6) and the EXV (13) is closed, and the pipeline from the evaporator (15) to the chiller (4) and the EXV (3) is opened, so that the parallel system becomes a series system.

2. The method for converting a parallel dehumidification system of a secondary circuit thermal management system for an energy storage device into a series dehumidification system according to claim 1, characterized in that: In cooling mode, when the battery cabinet (16) has a cooling demand, the system enters cooling mode, and the refrigerant circuit: the refrigerant is pressurized by the compressor (1) and enters the water-cooled condenser (2). After transferring heat to the coolant in the water-cooled condenser (2), the refrigerant flows into the EXV (3) for throttling and pressure reduction, and then enters the evaporator (15) and the chiller (4) to absorb the heat of the coolant in the chiller (4) and the evaporator (15). The refrigerant then enters the compressor (1) and is pressurized again, thereby completing the circulation on the refrigerant side; Cooling liquid circuit: The cooling liquid heated in the water-cooled condenser (2) enters the electronic water pump (9) through the first four-way water valve (7), and enters the heat dissipation water tank (6) through the electronic water pump (9). The cooling liquid transfers heat to the outside air through the heat dissipation water tank (6) and the second fan (5). The cooled cooling liquid then enters the water-cooled condenser (2) through the second four-way water valve (8) to absorb heat. The cooling liquid cooled in the chiller (4) passes through the second four-way water valve (8) and enters the electronic water pump (10), and then flows into the battery cabinet (16) through the electronic water pump (10) to dissipate heat for the battery cabinet (16). After absorbing the heat, the cooling liquid flows out of the battery cabinet (16), passes through the first four-way water valve (7), and enters the chiller (4) to be cooled by the refrigerant. Dehumidification circuit: The high-temperature and high-humidity air pumped from the battery cabinet (16) by the first fan (14) is cooled and dehumidified by the dehumidification module evaporator (15), and then blown dry by the first fan (14) and sent back to the battery cabinet (16).

3. The method for converting a parallel dehumidification system of a secondary circuit thermal management system for an energy storage device into a series dehumidification system according to claim 2, characterized in that: In the heating mode, when the battery cabinet (16) has a heating demand, the thermal management system enters the heat pump mode; Cooling liquid circuit: the cooling liquid that absorbs heat in the water-cooled condenser (2) enters the electronic water pump (10) through the second four-way water valve (8), flows into the battery cabinet (16) through the electronic water pump (10), and heats the battery cabinet (16). The cooling liquid that releases heat enters the water-cooled condenser (2) through the first four-way water valve (7) from the battery cabinet (16) to absorb heat; The cooled coolant in the chiller (4) passes through the second four-way water valve (8) and enters the heat dissipation water tank (6). The low-temperature coolant absorbs heat from the outside air through the action of the heat dissipation water tank (6) and the second fan (5). The coolant after absorbing the heat then passes through the electronic water pump (9) and enters the first four-way water valve (7). Then, it passes through the first four-way water valve (7) and enters the chiller (4) to transfer the heat to the refrigerant. Dehumidification circuit: The high-temperature and high-humidity air pumped from the battery cabinet (16) by the first fan (14) is cooled and dehumidified by the dehumidification module evaporator (15), and then blown dry by the first fan (14) and sent back to the battery cabinet (16).

4. A method for converting a parallel dehumidification system of a secondary circuit thermal management system for an energy storage device into a series dehumidification system according to claim 2 or 3, characterized in that: It also includes a natural wind cooling mode. When the battery cabinet (16) has a heat dissipation demand and the external ambient temperature is relatively suitable, the thermal management system enters the natural wind cooling mode, and the refrigerant side does not work at this time; Cooling liquid circuit: The cooling liquid flowing out of the battery cabinet (16) flows through the first four-way water valve (7) into the chiller (4), then flows through the second four-way water valve (8) and enters the heat dissipation water tank (6), and then transfers heat to the outside air through the action of the heat dissipation water tank (6) and the second fan (5). The cooled cooling liquid flows through the electronic water pump (9) and the first four-way water valve (7) into the water-cooled condenser (2), then passes through the second four-way water valve (8) into the electronic water pump (10) and finally flows into the battery cabinet (16). The cooling liquid absorbs heat from the battery cabinet (16) and then flows out; Alternatively, the coolant flowing out of the battery cabinet (16) enters the water-cooled condenser (2) through the first four-way water valve (7), then flows through the second four-way water valve (8) and then enters the heat dissipation water tank (6), and heat is transferred to the outside air through the heat dissipation water tank (6) and the second fan (5). The cooled coolant flows into the chiller (4) after passing through the electronic water pump (9) and the first four-way water valve (7), then enters the electronic water pump (10) through the second four-way water valve (8) and finally flows into the battery cabinet (16), and the coolant absorbs heat from the battery cabinet (16) and then flows out; Alternatively, the coolant flowing out of the battery cabinet (16) flows through the first four-way water valve (7) and the electronic water pump (9) and then enters the heat dissipation water tank (6). The heat is transferred to the outside air through the action of the heat dissipation water tank (6) and the second fan (5). The cooled coolant flows through the second four-way water valve (8) and then flows into the electronic water pump (10) and finally flows into the battery cabinet (16). The coolant absorbs heat from the battery cabinet (16) and then flows out. Dehumidification circuit: The high-temperature and high-humidity air pumped from the battery cabinet (16) by the first fan (14) is cooled and dehumidified by the dehumidification module evaporator (15), and then the first fan (14) blows the dry air into the battery cabinet (16).

5. The method for converting a parallel dehumidification system of a secondary circuit thermal management system for an energy storage device into a series dehumidification system according to claim 4, characterized in that: The refrigerant circuit also includes a liquid storage tank (11), which is arranged between the water-cooled condenser (2) and the EXV (3) or the EXV (13).

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