PCS and battery cluster series energy-saving liquid cooling system

Abstract

The utility model relates to the technical field of energy storage and temperature control, in particular to a PCS and battery cluster series energy-saving liquid cooling system, which comprises a refrigeration module, a hydraulic module and a battery cluster, the hydraulic module is connected with the battery cluster and is used for taking out heat of the battery cluster; the refrigeration module is connected with the hydraulic module and used for exchanging heat with the hydraulic module; the system further comprises a PCS liquid cooling device and a PCS. The battery cluster is connected with the PCS liquid cooling equipment in series, the hydraulic module is used for conducting heat exchange on the battery cluster and the PCS liquid cooling equipment which are connected in series at the same time, and the PCS liquid cooling equipment is used for conducting heat exchange on the PCS. The battery cluster and the PCS share one liquid cooling system, the functions of compression refrigeration, fluorine pump refrigeration and dehumidification are integrated at the same time, the energy consumption is reduced, the installation space and the cost are saved, the system can be dehumidified while heat dissipation and cooling are met, and the risk of condensation of the system can be effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage temperature control, and more specifically, to a PCS and battery cluster series energy-saving liquid cooling system. Background Art

[0002] With the rapid development of renewable energy generation, smart grid and other fields, the demand for energy storage systems is growing. In current energy storage systems, the number of single cells is generally large, and a large amount of heat is generated during rapid charging and discharging. If effective heat dissipation and cooling are not performed, the heat in the energy storage system will cause the battery pack to overheat, thereby reducing the battery's performance and may even cause serious consequences such as fire and explosion. In addition, continuous high temperature will accelerate battery aging, reduce battery cycle life and the performance of the overall energy storage system. Therefore, how to do a good job of thermal management of the energy storage system has become a major challenge.

[0003] At present, liquid cooling temperature control is gradually becoming the mainstream cooling method for energy storage systems. Compared with air cooling temperature control, liquid cooling temperature control has the advantages of high heat dissipation efficiency and good temperature uniformity, which can increase the life of the battery. Therefore, for energy storage containers with high heat dissipation and high battery charge and discharge rates, the usual practice is to use a PCS liquid cooling system for PCS heat dissipation and a battery cluster liquid cooling system for battery cluster heat dissipation. This liquid cooling method requires multiple sets of liquid cooling systems, which occupy a large space, and have relatively high energy consumption and operating costs. In addition, when a liquid cooling system is used to dissipate heat from the energy storage container, when the surface temperature of the components after the liquid cooling system is too low, the high temperature and high humidity air in the energy storage container is likely to form condensation on the surface of the low-temperature components and circuits, causing safety hazards. Utility Model Content

[0004] The utility model aims to overcome at least one defect (shortcoming) of the above-mentioned prior art and provide a PCS and battery cluster series energy-saving liquid cooling system, which can simultaneously meet the heat dissipation and cooling of the battery pack and the PCS, reduce the energy consumption and operating cost of the liquid cooling system, and save energy on occupied space.

[0005] The technical solution adopted by the utility model is: to provide a PCS and battery cluster series energy-saving liquid cooling system, including a refrigeration module, a hydraulic module and a battery cluster, the hydraulic module is connected to the battery cluster, and is used to take out the heat of the battery cluster; the refrigeration module is connected to the hydraulic module, and is used to perform heat exchange with the hydraulic module; it also includes a PCS liquid cooling device and a PCS, the battery cluster is connected in series with the PCS liquid cooling device, the hydraulic module is used to simultaneously perform heat exchange between the battery cluster and the PCS liquid cooling device connected in series, and the PCS liquid cooling device is used to perform heat exchange on the PCS.

[0006] The utility model brings out the heat of the battery cluster through the hydraulic module, and at the same time brings out the heat of the PCS through the hydraulic module, and performs centralized and unified heat dissipation and cooling processing on the heat brought out by the hydraulic module through the refrigeration module, thereby realizing an integrated solution to the cooling problem and saving energy consumption and space.

[0007] Furthermore, the PCS liquid cooling equipment includes a PCS heat exchanger, a PCS water pump and a three-way valve; the PCS, the three-way valve, the PCS heat exchanger and the PCS water pump are connected in sequence to form a first liquid cooling circulation loop; at the same time, the third interface of the three-way valve is connected to the input port of the PCS water pump, so that the PCS, the three-way valve and the PCS water pump are connected in sequence to form a second liquid cooling circulation loop; the three-way valve is used to adjust and distribute the coolant in the PCS liquid cooling equipment to flow to the first liquid cooling circulation loop and the second liquid cooling circulation loop.

[0008] By bypassing part of the PCS return liquid to the PSC inlet through a three-way valve, the liquid cooling temperature on the PCS liquid equipment side can be accurately controlled, avoiding the risk of condensation on the surface of components caused by the hot and humid air in the PCS installation environment due to the low liquid supply temperature of the PCS liquid equipment, thereby effectively avoiding the safety hazards caused by condensation.

[0009] Furthermore, the refrigeration module includes a compression refrigeration unit and a fluorine pump refrigeration unit, and the compression refrigeration unit and the fluorine pump refrigeration unit are connected to the hydraulic module for heat exchange with the hydraulic module.

[0010] Two different refrigeration and heat dissipation units, compression refrigeration unit and fluorine pump refrigeration unit, are used to cool down the PCS and battery cluster. The appropriate refrigeration mode can be selected according to different ambient temperatures, which is more flexible, reliable and energy-saving.

[0011] Furthermore, a dehumidification unit is included, which is connected to the compression refrigeration unit and is used to dehumidify the installation environment of the battery cluster and the PCS.

[0012] By using the dehumidification unit to dehumidify the high-humidity air in the system, the impact of humid air on the electrical components in the energy storage container can be reduced, thereby improving the stability of system operation.

[0013] Furthermore, the dehumidification unit includes a dehumidification evaporator and a second fan; the dehumidification evaporator is connected to the compression refrigeration unit; the second fan is used for convection to make the battery cluster and the PCS exchange heat with the dehumidification evaporator.

[0014] Through the forced convection of the second fan, the high-humidity air inside the container exchanges heat with the dehumidification evaporator, and the moisture in the high-humidity air condenses and precipitates under the heat absorption and evaporation of the refrigerant in the dehumidification evaporator, thereby achieving dehumidification.

[0015] Furthermore, a second expansion valve is provided at the inlet of the dehumidification unit, and the second expansion valve is used to independently control the evaporation pressure of the dehumidification evaporator.

[0016] Furthermore, the dehumidification unit further comprises an air PTC heater, and the air PTC heater is used to provide heat compensation for the air delivered by the dehumidification unit.

[0017] The air PTC heater performs thermal compensation on the dehumidified air, so that the ambient air temperature entering the battery cluster and PCS is maintained within a suitable range, effectively improving the stability and energy efficiency of the energy storage container operation.

[0018] Specifically, the hydraulic module includes a pump and a first PTC heater, and the battery cluster, the pump, and the first PTC heater are connected in sequence through pipelines to form a hydraulic circulation loop; the first PTC heater is used to heat the liquid in the hydraulic circulation loop; an expansion tank is connected to the pipeline between the pump and the battery cluster, and the expansion tank is used to stabilize the pressure of the hydraulic circulation loop; the pipeline between the expansion tank and the battery cluster is connected in series with the PCS heat exchanger, and the liquid in the hydraulic circulation loop is driven by the pump to exchange heat with the battery cluster, and then passes through the PCS heat exchanger and exchanges heat with the PCS heat exchanger, and finally flows through the evaporator and is isolated from the refrigerant in the evaporator for heat exchange.

[0019] Specifically, the compression refrigeration unit includes an evaporator, a compressor, a first one-way valve, a condenser, a liquid storage tank, a second one-way valve and a first expansion valve; the evaporator, the compressor, the first one-way valve, the condenser, the liquid storage tank, the second one-way valve and the first expansion valve are connected in sequence to form a compression refrigeration cycle, and the compression refrigeration unit performs heat exchange with the hydraulic module through the evaporator.

[0020] Specifically, the fluorine pump refrigeration unit includes a third one-way valve and a fluorine pump; the evaporator, the third one-way valve, the condenser, the liquid storage tank, the fluorine pump and the first expansion valve are connected in sequence to form a fluorine pump refrigeration cycle, and the fluorine pump refrigeration unit performs heat exchange with the hydraulic module through the evaporator.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] (1) The utility model dissipates heat from the system by using a liquid cooling method using a coolant. The coolant in the liquid cooling system can directly contact the heat source, so the heat dissipation and cooling effect is more efficient, the temperature uniformity is better, and the battery life can be extended.

[0023] (2) The utility model integrates compression refrigeration, fluorine pump refrigeration and dehumidification functions, and can be adapted to different ambient temperatures and different heat dissipation requirements, thereby improving the reliability and energy efficiency of the system and saving installation space and costs.

[0024] (3) The PCS and battery cluster of the utility model are connected in series and share a liquid cooling system for heat dissipation and temperature reduction, which improves energy efficiency, saves installation volume, and reduces weight and cost;

[0025] (4) The PCS liquid cooling device of the utility model adjusts the temperature of the coolant through a three-way valve, which can maintain the PCS at an appropriate operating temperature, achieving energy-saving and high-efficiency effects, while avoiding safety hazards caused by condensation due to too low PCS liquid supply temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a circuit structure diagram of Example 1 of the utility model.

[0027] Figure 2 This is a circuit structure diagram of Example 2 of the present utility model.

[0028] Figure 3 This is a circuit structure diagram of Example 3 of the utility model.

[0029] Figure markings: 1-compressor; 2-first one-way valve; 3-condenser; 4-first fan; 5-liquid storage tank; 6-fluorine pump; 7-second one-way valve; 8-first expansion valve; 9-evaporator; 10-third one-way valve; 11-pump; 12-first PTC heater; 13-three-way valve; 14-battery cluster; 15-PCS; 16-expansion tank; 17-PCS water pump; 18-PCS heat exchanger; 19-second expansion valve; 20-dehumidification evaporator; 21-second fan; 22-air PTC heater. DETAILED DESCRIPTION

[0030] The drawings of the present invention are only used for illustrative purposes and cannot be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0031] Example 1

[0032] like Figure 1 As shown, this embodiment provides a PCS and battery cluster series energy-saving liquid cooling system, including a refrigeration module, a hydraulic module and a battery cluster 14, the hydraulic module is connected to the battery cluster 14, and is used to take out the heat of the heat dissipation object; the refrigeration module is connected to the hydraulic module, and is used to perform heat exchange with the hydraulic module; it also includes a PCS liquid cooling device and PCS15, the battery cluster 14 is connected in series with the PCS liquid cooling device, the hydraulic module is used to simultaneously perform heat exchange between the battery cluster 14 and the PCS liquid cooling device connected in series, and the PCS liquid cooling device is used to perform heat exchange on the PCS15.

[0033] In the specific implementation process, the hydraulic module is connected to the battery cluster 14, and the heat of the battery cluster 14 is taken out through the coolant in the hydraulic module pipeline. After the hydraulic module absorbs the heat of the battery cluster 14, it also passes through the PCS liquid cooling device connected in series with the battery cluster 14, and at the same time takes out the heat of the PCS liquid cooling device. Since the operating temperature range of PCS15 and the battery cluster 14 is quite different, the liquid supply temperature of the battery cluster 14 is generally around 18-22°C, while the liquid supply temperature of the PCS liquid cooling device is generally around 40-55°C, so the PCS liquid cooling device is connected in series with the battery cluster 14, and the hydraulic module is first used to exchange heat with the battery cluster 14. After the heat exchange, the temperature of the coolant in the hydraulic module is still lower than the suitable temperature of PCS15, so the hydraulic module passes through the PCS liquid cooling device again to exchange heat. After the heat exchange, the PCS liquid cooling device can fully meet the heat exchange requirements of PCS15, and finally the cooling module is used for unified heat dissipation and cooling. The PCS 15 and the battery cluster 14 of this embodiment share a refrigeration module for heat dissipation and temperature reduction. Compared with using multiple sets of liquid cooling systems, this reduces the occupied volume and manufacturing cost and improves the energy efficiency ratio of the liquid cooling system.

[0034] Specifically, the PCS liquid cooling equipment includes a PCS heat exchanger 18 and a PCS water pump 17. PCS15, PCS heat exchanger 18, and PCS water pump 17 are connected in sequence through pipelines to form a liquid cooling circulation loop, and the PCS liquid cooling equipment performs heat exchange with the hydraulic module through the PCS heat exchanger 18. In order to more accurately control the temperature of PCS15, a three-way valve 13 can also be set at the outlet of PCS15. In a specific implementation, PCS15, the three-way valve 13, the PCS heat exchanger 18, and the PCS water pump 17 are connected in sequence to form a first liquid cooling circulation loop; at the same time, the third interface of the three-way valve 13 is connected to the input port of the PCS water pump 17, so that PCS15, the three-way valve 13, and the PCS water pump 17 are connected in sequence to form a second liquid cooling circulation loop.

[0035] Typically, the battery cluster 14 includes a plurality of battery packs connected in parallel, which are connected in series with the PCS liquid cooling device after being connected in parallel. The coolant in the hydraulic module pipeline drives the pump 11 to remove the heat from the battery cluster 14 and the PCS 15. The coolant in the hydraulic module pipeline exchanges heat with the refrigeration module and then enters the battery cluster 14. The coolant is shunted to the branches of each battery pack in the battery cluster 14 to cool down each battery pack. The coolant after the shunted heat exchange is collected and then enters the PCS heat exchanger 18 through the series pipeline to further release the cold, thereby completing the hydraulic module coolant circulation.

[0036] The three-way valve 13 is mainly used to regulate and distribute the coolant in the PCS liquid cooling equipment to the first liquid cooling circulation loop and the second liquid cooling circulation loop. The PCS heat exchanger 18 of the first liquid cooling circulation loop exchanges heat with the hydraulic module to cool the coolant in the first circulation loop. The coolant in the second liquid cooling circulation loop maintains a high temperature because it has not been cooled. The coolant in the first circulation loop and the second circulation loop merges in front of the inlet of the PCS water pump 17 so that the merged coolant maintains a certain temperature.

[0037] In actual application, the opening of the three-way valve 13 can be adjusted according to actual needs to distribute the coolant flow of the first circulation loop and the second circulation loop, so as to more accurately control the temperature of the coolant entering the PCS15, avoiding the safety hazard caused by condensation of the PCS15 due to the low liquid supply temperature of the PCS liquid cooling equipment.

[0038] The refrigeration module of this embodiment includes a compression refrigeration unit and a fluorine pump refrigeration unit, and the compression refrigeration unit and the fluorine pump refrigeration unit are connected to the hydraulic module for heat exchange with the hydraulic module.

[0039] Specifically, the compression refrigeration unit includes an evaporator 9, a compressor 1, a first one-way valve 2, a condenser 3, a liquid storage tank 5, a second one-way valve 7 and a first expansion valve 8; the evaporator 9, the compressor 1, the first one-way valve 2, the condenser 3, the liquid storage tank 5, the second one-way valve 7 and the first expansion valve 8 are connected in sequence to form a compression refrigeration cycle, and the compression refrigeration unit performs heat exchange with the hydraulic module through the evaporator 9.

[0040] The fluorine pump refrigeration unit includes a third one-way valve 10 and a fluorine pump 6; a fluorine pump 6 refrigeration cycle is formed by connecting the evaporator 9, the third one-way valve 10, the condenser 3, the liquid storage tank 5, the fluorine pump 6 and the first expansion valve 8 in sequence, and the fluorine pump refrigeration unit performs heat exchange with the hydraulic module through the evaporator 9.

[0041] The refrigeration module is also provided with a first fan 4, which is used to accelerate the air flow on the surface of the condenser 3 by forced convection. As the airflow generated by the first fan 4 continuously blows through the condenser 3, the heat on the condenser 3 is quickly taken away and discharged to the outdoor environment, thereby achieving effective heat dissipation of the entire system. In actual application, the first fan 4 can be set near the condenser 3, for example, behind the condenser 3. The specific setting position can be determined according to actual conditions, and only examples are given here for specific explanation.

[0042] By setting up a compression refrigeration unit and a fluorine pump refrigeration unit, the refrigeration module has two different refrigeration modes: compression refrigeration mode and fluorine pump refrigeration mode, so that the system can flexibly adapt to different ambient temperatures and heat dissipation requirements, thereby improving the accuracy of temperature control and the energy efficiency of refrigeration. At the same time, the compression refrigeration unit and the fluorine pump refrigeration unit share some pipelines, such as the shared condenser 3, the first fan 4, the liquid storage tank 5, the first expansion valve 8 and the evaporator 9, etc., saving space and manufacturing costs. It should be noted that the compression refrigeration mode is to start the compression refrigeration unit; the fluorine pump refrigeration mode is to start the fluorine pump refrigeration unit.

[0043] The compression refrigeration unit can adopt an air-cooled variable frequency direct expansion refrigeration system. When the ambient temperature is greater than the preset switching temperature, the compression refrigeration mode is turned on to ensure that at least one branch works in the same period. During operation, the coolant of the hydraulic module absorbs the heat of the battery cluster 14 and PCS15, and transfers the heat of the coolant to the refrigerant in the evaporator 9 through the evaporator 9. The refrigerant in the evaporator 9 absorbs heat and evaporates and returns to the compressor 1. The compressor 1 compresses the low-temperature and low-pressure gas into high-temperature and high-pressure gas, which enters the condenser 3 through the first one-way valve 2 and dissipates the heat to the outdoor environment through the first fan 4 forced convection, thereby condensing the high-temperature and high-pressure gas into medium-temperature and high-pressure liquid, which enters the first expansion valve 8 through the liquid storage tank 5 and the second one-way valve 7 to throttle and reduce the pressure into a low-temperature and low-pressure gas-liquid mixture, and then enters the evaporator 9 to absorb heat and evaporate into a low-temperature and low-pressure gas, thereby forming a closed compression refrigeration cycle.

[0044] The fluorine pump refrigeration mode mainly uses the latent heat of phase change of the refrigerant to take away the heat of the battery cluster 14 and the PCS 15. When using the fluorine pump refrigeration mode, there is no need to start the compressor 1. Compared with the compression refrigeration mode, it is more efficient and energy-saving and suitable for use in low temperature climates. When the ambient temperature is less than or equal to the preset switching temperature, the fluorine pump refrigeration mode is started and the compression refrigeration mode is turned off to ensure that at least one branch is working in the same period. When the fluorine pump refrigeration mode is turned on, the refrigerant in the refrigeration system is pumped into the first expansion valve 8 by the running fluorine pump 6, and a low-temperature and low-pressure gas-liquid mixture is formed after throttling and reducing the pressure of the first expansion valve 8. The gas-liquid mixture then enters the evaporator 9 and is isolated from the coolant of the hydraulic module that absorbs the heat of the battery cluster 14 and the PCS 15 for heat exchange. After the refrigerant absorbs heat and evaporates, it enters the condenser 3 through the third one-way valve 10 and dissipates the heat of the system to the outdoor environment through the first fan 4 through forced convection, forming a medium-temperature and high-pressure refrigerant liquid through the liquid storage tank 5, and then the refrigerant is pumped into the first expansion valve 8 through the fluorine pump 6 to throttle and reduce the pressure to form a low-temperature and low-pressure gas-liquid mixture and return to the evaporator 9, thereby forming a fluorine pump refrigeration closed cycle. The refrigeration system adopts a design of integrated compression refrigeration and fluorine pump refrigeration. When in use, different refrigeration modes can be turned on according to different ambient temperatures and heat dissipation requirements, making the refrigeration system of this embodiment more efficient and energy-saving, improving the system's low-temperature startup performance, enhancing environmental adaptability, and more helpful in extending the service life of the compressor 1 and the battery.

[0045] In this embodiment, the hydraulic module includes a pump 11 and a first PTC heater 12. The battery cluster 14, the pump 11, and the first PTC heater 12 are connected in sequence through pipelines to form a hydraulic circulation loop. The first PTC heater 12 is used to heat the liquid in the hydraulic circulation loop; an expansion tank 16 is connected to the pipeline between the pump 11 and the battery cluster 14, and the expansion tank 16 is used to stabilize the pressure of the hydraulic circulation loop; the pipeline between the expansion tank 16 and the battery cluster 14 is connected in series with the PCS heat exchanger 18, and the liquid in the hydraulic circulation loop exchanges heat with the battery cluster 14 through the drive of the pump 11, and then passes through the PCS heat exchanger 18 and exchanges heat with the PCS heat exchanger 18, and finally flows through the evaporator 9 and exchanges heat with the refrigerant in the evaporator 9 in isolation. When the temperature of the liquid in the hydraulic circulation loop is too low, the first PTC heater 12 can be turned on to heat the liquid in the hydraulic circulation loop.

[0046] In this embodiment, the heat of the battery cluster 14 and the PCS 15 is removed by the hydraulic module, and the heat removed by the hydraulic module is centrally and uniformly dissipated and cooled by the compression refrigeration unit and the fluorine pump refrigeration unit, thereby achieving an integrated solution to the cooling problem and saving the system's energy consumption and occupied space.

[0047] Example 2

[0048] like Figure 2As shown, this embodiment provides a PCS and battery cluster series energy-saving liquid cooling system. Different from Embodiment 1, the compression refrigeration unit of this embodiment leads out a branch as a dehumidification unit, which is used to control the air humidity of related electrical components and circuits such as the battery cluster 14 and PCS 15, thereby improving the safety and reliability of the entire energy storage system. The dehumidification unit includes a dehumidification evaporator 20 and a second fan 21; the inlet of the dehumidification evaporator 20 is connected between the second one-way valve 7 and the first expansion valve 8, and the outlet of the dehumidification evaporator 20 is connected to the inlet of the compressor 1; the second fan 21 is used for convection to make the heat dissipation object and the dehumidification evaporator 20 exchange heat. A second expansion valve 19 is also provided at the inlet of the dehumidification unit, and the second expansion valve 19 is used to independently control the evaporation pressure of the dehumidification evaporator 20. When dehumidification is required, the system switches to compression refrigeration mode, i.e., the compression refrigeration unit is started and the fluorine pump refrigeration unit is turned off at the same time. The second fan 21 forces convection, so that the high-humidity air inside the energy storage container exchanges heat with the dehumidification evaporator 20. The moisture carried by the high-humidity air condenses and precipitates under the heat absorption and evaporation of the refrigerant in the dehumidification evaporator 20, and the low-temperature and low-humidity air after the heat exchange is sent to the battery cluster 14 and PCS 15, thereby realizing the dehumidification function of the system. Using an integrated compression refrigeration and dehumidification system to realize the refrigeration and dehumidification functions can reduce the impact of humid air on the electrical components and electronic circuits of the energy storage container, improve the stability of the energy storage system operation, save a certain amount of space and cost, and facilitate installation and operation and maintenance.

[0049] Example 3

[0050] like Figure 3 As shown, this embodiment provides a PCS and battery cluster series energy-saving liquid cooling system. Based on Example 2, this embodiment superimposes an air PTC heater 22 on the dehumidification evaporator 20. When the air temperature after heat exchange with the dehumidification evaporator 20 is too low, the low-temperature air will reduce the working performance of the battery cluster 14 and the PCS 15. At this time, the low-temperature and low-humidity air after heat exchange with the dehumidification evaporator 20 can be thermally compensated by the air PTC heater 22, thereby further controlling the air temperature and humidity sent to the battery cluster 14 and the PCS 15, so that the battery cluster 14 and the PCS 15 can maintain efficient operation within a suitable temperature range. This embodiment can control whether to turn on the air PTC heater 22 for thermal compensation according to the air temperature and humidity in the battery cluster 14 and the PCS 15, further improving the reliability and working performance of the energy storage container, while optimizing the energy efficiency of the energy storage system.

[0051] Obviously, the above embodiments of the utility model are only examples for clearly explaining the technical solution of the utility model, and are not intended to limit the specific implementation methods of the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. A PCS and battery cluster series energy-saving liquid cooling system, comprising a refrigeration module, a hydraulic module and a battery cluster; the hydraulic module is connected to the battery cluster to remove the heat of the battery cluster; the refrigeration module is connected to the hydraulic module to perform heat exchange with the hydraulic module, characterized in that: It also includes a PCS liquid cooling device and a PCS, the battery cluster is connected in series with the PCS liquid cooling device, the hydraulic module is used to simultaneously perform heat exchange between the battery cluster and the PCS liquid cooling device connected in series, and the PCS liquid cooling device is used to perform heat exchange on the PCS.

2. The PCS and battery cluster series energy-saving liquid cooling system according to claim 1, characterized in that: The PCS liquid cooling equipment includes a PCS heat exchanger, a PCS water pump and a three-way valve; the PCS, the three-way valve, the PCS heat exchanger and the PCS water pump are connected in sequence to form a first liquid cooling circulation loop; at the same time, the third interface of the three-way valve is connected to the input port of the PCS water pump, so that the PCS, the three-way valve and the PCS water pump are connected in sequence to form a second liquid cooling circulation loop; the three-way valve is used to adjust and distribute the coolant in the PCS liquid cooling equipment to flow to the first liquid cooling circulation loop and the second liquid cooling circulation loop.

3. The PCS and battery cluster series energy-saving liquid cooling system according to claim 2, characterized in that: The refrigeration module comprises a compression refrigeration unit and a fluorine pump refrigeration unit, and the compression refrigeration unit and the fluorine pump refrigeration unit are connected to the hydraulic module for heat exchange with the hydraulic module.

4. A PCS and battery cluster series energy-saving liquid cooling system according to claim 3, characterized in that: A dehumidification unit is also included, which is connected to the compression refrigeration unit and is used to dehumidify the installation environment of the battery cluster and the PCS.

5. The PCS and battery cluster series energy-saving liquid cooling system according to claim 4, characterized in that: The dehumidification unit includes a dehumidification evaporator and a second fan; the dehumidification evaporator is connected to the compression refrigeration unit; the second fan is used for convection to make the battery cluster and the PCS exchange heat with the dehumidification evaporator.

6. The PCS and battery cluster series energy-saving liquid cooling system according to claim 5, characterized in that: The inlet of the dehumidification unit is also provided with a second expansion valve, and the second expansion valve is used to independently control the evaporation pressure of the dehumidification evaporator.

7. A PCS and battery cluster series energy-saving liquid cooling system according to any one of claims 4 to 6, characterized in that: The dehumidification unit further comprises an air PTC heater, and the air PTC heater is used to provide heat compensation for the air delivered by the dehumidification unit.

8. A PCS and battery cluster series energy-saving liquid cooling system according to any one of claims 3 to 6, characterized in that: The compression refrigeration unit includes an evaporator, a compressor, a first one-way valve, a condenser, a liquid storage tank, a second one-way valve and a first expansion valve; the evaporator, the compressor, the first one-way valve, the condenser, the liquid storage tank, the second one-way valve and the first expansion valve are connected in sequence to form a compression refrigeration cycle, and the compression refrigeration unit performs heat exchange with the hydraulic module through the evaporator.

9. A PCS and battery cluster series energy-saving liquid cooling system according to claim 8, characterized in that: The hydraulic module includes a pump and a first PTC heater, and the battery cluster, the pump, and the first PTC heater are connected in sequence through pipelines to form a hydraulic circulation loop; the first PTC heater is used to heat the liquid in the hydraulic circulation loop; an expansion tank is connected to the pipeline between the pump and the battery cluster, and the expansion tank is used to stabilize the pressure of the hydraulic circulation loop; the pipeline between the expansion tank and the battery cluster is connected in series with the PCS heat exchanger, and the liquid in the hydraulic circulation loop exchanges heat with the battery cluster through the drive of the pump, then passes through the PCS heat exchanger and exchanges heat with the PCS heat exchanger, and finally flows through the evaporator and exchanges heat with the refrigerant in the evaporator in isolation.

10. A PCS and battery cluster series energy-saving liquid cooling system according to claim 9, characterized in that: The fluorine pump refrigeration unit includes a third one-way valve and a fluorine pump; the evaporator, the third one-way valve, the condenser, the liquid storage tank, the fluorine pump and the first expansion valve are connected in sequence to form a fluorine pump refrigeration cycle, and the fluorine pump refrigeration unit performs heat exchange with the hydraulic module through the evaporator.

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