Electrochemical energy storage waste heat closed circulation comprehensive utilization system and working method thereof

Abstract

According to the electrochemical energy storage waste heat closed circulation comprehensive utilization system and the working method thereof, an electrochemical energy storage heat source and geothermal energy are subjected to advantage complementation, the system is environmentally friendly, and the energy utilization efficiency and economical efficiency can be improved. The input end heat exchanger is connected with a geothermal source buried pipe system; an outlet of the geothermal source buried pipe system is divided into two paths, one path is connected with the input end heat exchanger, and the other path is connected with the temperature control valve through a fourth valve. The compressor is connected with the input end heat exchanger and the output end heat exchanger, and the output end heat exchanger is connected with the input end heat exchanger and the heat preservation water tank. A cooling medium outlet of the battery system is divided into two paths, one path is connected with the geothermal source buried pipe system through a first valve, the other path is connected with an output end heat exchanger through a second valve, and the output end heat exchanger is connected with a temperature control valve through a third valve. The temperature control valve is connected with the cold liquid box and the cooler, the cold liquid box is connected with the battery system, and the cooler is connected with the cold liquid box.

Description

Technical Field

[0001] The invention relates to an electrochemical energy storage waste heat closed cycle comprehensive utilization system and a working method thereof. Background Art

[0002] At present, more and more wind and solar power stations are connected to the power grid, and their large fluctuations in power generation pose a great challenge to the power system. Electrochemical energy storage has become an important force in new energy storage technology with its advantages such as fast response speed, high energy density, no geographical restrictions, and gradually improving economic efficiency, providing strong support for the construction of new power systems.

[0003] Electrochemical energy storage refers to the process of energy storage, release and management completed by batteries. It is mainly composed of battery packs, battery management systems (BMS), energy management systems (EMS), power storage converters (PCS) and other electrical equipment.

[0004] As the capacity of electrochemical energy storage systems increases, more batteries are required, and the battery capacity and power are also greater. Temperature has a huge impact on the performance of lithium-ion batteries, such as capacity, power and safety. A large number of battery packs are closely arranged in a space, and the operating conditions are complex and changeable. Sometimes they run at high rates, and sometimes they run at low rates. This can easily cause problems such as uneven heat generation, uneven temperature distribution, and large temperature differences in battery packs. In the long run, this will inevitably lead to a decline in the charging and discharging performance, capacity, and life of some batteries, thereby affecting the stable operation of the entire system. Lithium-ion batteries generate heat energy during the charging and discharging process. When the heat generated by the battery cannot be dissipated in time, the heat will accumulate in the battery to form high temperature. In severe cases, it will cause thermal runaway and cause accidents. Therefore, effectively controlling the temperature of lithium-ion batteries is a prerequisite for the safe and stable operation of energy storage systems.

[0005] At present, the mainstream thermal management technology routes of electrochemical energy storage systems are divided into air cooling and liquid cooling. However, the existing thermal management technology routes are based on directly dissipating the waste heat generated during the operation of the electrochemical energy storage system without considering its comprehensive utilization, which leads to a reduction in the energy utilization efficiency of the electrochemical energy storage power station and does not meet the goal of green energy conservation. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a reasonably structurally designed electrochemical energy storage waste heat closed-cycle comprehensive utilization system and its working method, which complements the advantages of electrochemical energy storage heat sources and geothermal energy, and comprehensively utilizes waste heat, which is both environmentally friendly and can improve energy utilization efficiency and economy.

[0007] The technical solution adopted by the present invention to solve the above-mentioned problems is: an electrochemical energy storage waste heat closed-cycle comprehensive utilization system, including an electrochemical energy storage heat source system and a geothermal source buried pipe system, the electrochemical energy storage heat source system includes a battery system; it is characterized in that: it also includes a heat pump system and a user terminal system; the electrochemical energy storage heat source system also includes a cold liquid tank, a cooler, a temperature control valve, a No. 1 valve, a No. 2 valve, a No. 3 valve and a No. 4 valve; the heat pump system includes an input end heat exchanger, a compressor, an expansion valve and an output end heat exchanger; the user terminal system includes an insulated water tank; the hot runner outlet of the input end heat exchanger is connected to the inlet of the geothermal source buried pipe system; the outlet of the geothermal source buried pipe system is divided into two paths, one path is connected to the hot runner inlet of the input end heat exchanger, and the other path is connected to the inlet of the temperature control valve through the No. 4 valve; the inlet of the compressor is connected to the input end heat exchanger. The outlet of the cold runner of the heat exchanger is connected, the outlet of the compressor is connected to the first hot runner inlet of the output end heat exchanger, and the first hot runner outlet of the output end heat exchanger is connected to the cold runner inlet of the input end heat exchanger through an expansion valve; the cold runner inlet and the cold runner outlet of the output end heat exchanger are both connected to the insulation water tank; the cooling medium outlet of the battery system is divided into two routes, one route is connected to the inlet of the geothermal source buried pipe system through valve No. 1, and the other route is connected to the second hot runner inlet of the output end heat exchanger through valve No. 2, and the second hot runner outlet of the output end heat exchanger is connected to the inlet of the temperature control valve through valve No. 3; the first outlet of the temperature control valve is connected to the inlet of the cold liquid tank, and the outlet of the cold liquid tank is connected to the cooling medium inlet of the battery system; the second outlet of the temperature control valve is connected to the inlet of the cooler, and the outlet of the cooler is connected to the inlet of the cold liquid tank.

[0008] The electrochemical energy storage heat source system of the present invention further comprises a cold liquid pump, and the outlet of the cold liquid tank is connected to the cooling medium inlet of the battery system through the cold liquid pump.

[0009] The heat pump system of the present invention further comprises a liquid extraction pump, and one path of the outlet of the geothermal source buried pipe system is connected to the hot runner inlet of the input-end heat exchanger through the liquid extraction pump.

[0010] The heat pump system of the present invention further comprises a water pump, and the cold flow channel inlet of the output end heat exchanger is connected to the heat preservation water tank through the water pump.

[0011] The valve No. 1, valve No. 2, valve No. 3 and valve No. 4 described in the present invention are all electric valves.

[0012] A working method of an electrochemical energy storage waste heat closed cycle comprehensive utilization system, characterized by: comprising a winter medium circulation process of an energy storage heat source system and a summer medium circulation process of an energy storage heat source system; (1) Winter medium circulation process of energy storage heat source system: In winter, the user terminal has a large demand for heating, and valves No. 1 and No. 4 are closed, and valves No. 2 and No. 3 are opened; the heat generated during the operation of the battery system is transferred to the cooling medium, and the cooling medium is sent to the output end heat exchanger of the heat pump system to heat the water transported into the output end heat exchanger in the insulation water tank; the cooled cooling medium is sent to the temperature control valve, and after the temperature control valve detects that the temperature meets the use requirements, it is sent to the cold liquid tank for storage, and then sent back to the battery system for cooling; if the temperature control valve detects that the cooling medium temperature does not meet the electrochemical energy storage cooling requirements, the cooling medium is sent to the cooler through the temperature control valve for secondary cooling and then stored in the cold liquid tank, and then sent to the battery system for cooling; (2) Summer medium circulation process of the energy storage heat source system: In summer, the user terminal has a large demand for cooling, so valves No. 2 and No. 3 are closed and valves No. 1 and No. 4 are opened; the heat generated during the operation of the battery system is transferred to the cooling medium, and the cooling medium is sent to the geothermal source buried pipe system to cool the cooling medium; after the cooled cooling medium is tested by the temperature control valve and the temperature meets the use requirements, it is sent to the cold liquid tank for storage and then sent to the battery system for cooling; if the temperature control valve detects that the cooling medium temperature does not meet the electrochemical energy storage cooling requirements, the cooling medium is sent to the cooler through the temperature control valve for secondary cooling and then stored in the cold liquid tank, and then sent to the battery system for cooling.

[0013] The present invention also includes a heat pump working medium circulation process: In winter, if the heat generated during the operation of the battery system does not meet the heating demand of the user terminal, it is necessary to start the heat pump working medium circulation process. The heat pump working medium in this working condition flows forward, and the heat in the heat pump working medium circulation process is taken from the ground source heat. The ground source heat here already includes two parts, one is the original geothermal heat of nature, and the other is the waste heat retained in the ground by the battery system through the summer medium circulation process of the energy storage heat source system; the heat pump working medium absorbs the ground source heat in the ground source buried pipe system through the input end heat exchanger; the heat pump working medium after absorbing the ground source heat evaporates into gas, and is then pressurized into high-temperature and high-pressure gas by the compressor. These high-temperature and high-pressure gases enter the output end heat exchanger to heat the liquid transported into the output end heat exchanger by the insulation water tank; the heat pump working medium after releasing the heat itself changes into a low-temperature liquid, and then changes into a low-pressure liquid through throttling and pressure reduction by the thermal expansion valve and enters the input end heat exchanger; In summer, the battery system works in the summer medium circulation process state of the energy storage heat source system. The heat generated during the operation of the battery system no longer enters the output end heat exchanger, but directly enters the geothermal source vertical buried pipe system for heat dissipation; and the cooling demand of the user terminal is met by the reverse flow of the heat pump working medium, that is, the heat pump working medium absorbs the heat of the water in the insulated water tank through the output end heat exchanger, so that the water temperature in the insulated water tank is reduced, and the heat pump working medium itself evaporates into gas, completing the heat exchange process; the heat pump working medium that has become high-temperature gas is pressurized by the compressor into high-temperature and high-pressure gas and enters the input end heat exchanger, exchanges heat with the low-temperature medium in the geothermal source buried pipe system, completes the condensation process, and then passes through the expansion valve to throttle and reduce the pressure to become a low-temperature and low-pressure liquid and enter the output end heat exchanger.

[0014] The present invention realizes heat exchange between the water in the insulated water tank and the output end heat exchanger in the heat pump system, and provides the water in the insulated water tank to the user to realize the utilization of heat gradient; the water in the insulated water tank can be replenished by tap water.

[0015] Compared with the prior art, the present invention has the following advantages and effects: 1) In winter, the waste heat generated by the operation of the electrochemical energy storage system can be used in a gradient manner through the heat pump system, thereby improving the efficiency of the electrochemical energy storage system; 2) In summer, the electrochemical energy storage system is cooled by taking advantage of the fact that the temperature of underground soil or surface water or groundwater is lower than the ambient temperature, thereby reducing the power consumption of the energy storage system and improving the overall efficiency and economy; 3) The electrochemical energy storage system and ground source heat pump system realize comprehensive closed-loop utilization, do not produce substances harmful to the environment, do not cause damage to groundwater resources and the environment, and have significant benefits; 4) The coordinated use and unified control of electrochemical energy storage systems and ground-source thermal energy means that more cooling or heating can be obtained by consuming less electricity, which meets the requirements of energy conservation and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0018] 1. The electrochemical energy storage waste heat closed-cycle comprehensive utilization system of the embodiment of the present invention includes four subsystems, namely, the electrochemical energy storage heat source system, the geothermal source buried pipe system 10, the heat pump system and the user terminal system.

[0019] The electrochemical energy storage heat source system includes a battery system 1, a cold liquid pump 2, a cold liquid tank 3, a cooler 4, a temperature control valve 5, Valve No. 1 6, valve No. 2 7, valve No. 3 8 and valve No. 4 9. The heat pump system includes a liquid pump 11, an input end heat exchanger 12, a compressor 13, an expansion valve 14, an output end heat exchanger 15 and a water pump 16. The user terminal system includes an insulated water tank 17. Valve No. 1 6, valve No. 2 7, valve No. 3 8 and valve No. 4 9 are all electric valves.

[0020] The hot runner outlet of the input-end heat exchanger 12 is connected to the inlet of the geothermal source buried pipe system 10; the outlet of the geothermal source buried pipe system 10 is divided into two paths, one of which is connected to the hot runner inlet of the input-end heat exchanger 12 through the liquid extraction pump 11, and the other is connected to the inlet of the temperature control valve 5 through the No. 4 valve 9.

[0021] The inlet of the compressor 13 is connected to the cold runner outlet of the input end heat exchanger 12, the outlet of the compressor 13 is connected to the first hot runner inlet of the output end heat exchanger 15, and the first hot runner outlet of the output end heat exchanger 15 is connected to the cold runner inlet of the input end heat exchanger 12 through the expansion valve 14.

[0022] The cold channel inlet of the output end heat exchanger 15 is connected to the insulation water tank 17 through a water pump 16, and the cold channel outlet of the output end heat exchanger 15 is also connected to the insulation water tank 17. The water in the insulation water tank 17 enters the output end heat exchanger 15 through the water pump 16 as a cold source, and returns to the insulation water tank 17 after being heated.

[0023] The cooling medium outlet of the battery system 1 is divided into two routes, one of which is connected to the inlet of the geothermal source buried pipe system 10 through the No. 1 valve 6, and the other is connected to the second hot runner inlet of the output end heat exchanger 15 through the No. 2 valve 7. The second hot runner outlet of the output end heat exchanger 15 is connected to the inlet of the temperature control valve 5 through the No. 3 valve 8. The first outlet of the temperature control valve 5 is connected to the inlet of the cold liquid tank 3, and the outlet of the cold liquid tank 3 is connected to the cooling medium inlet of the battery system 1 through the cold liquid pump 2. The second outlet of the temperature control valve 5 is connected to the inlet of the cooler 4, and the outlet of the cooler 4 is connected to the inlet of the cold liquid tank 3.

[0024] 2. The working method of the electrochemical energy storage waste heat closed-cycle comprehensive utilization system of the embodiment of the present invention includes four closed cycles, namely the winter medium circulation process of the energy storage heat source system, the summer medium circulation process of the energy storage heat source system, the underground heat exchange medium circulation and the heat pump working medium circulation process, and there is also a set of multi-purpose user terminal system that can provide domestic hot water to buildings and adjust the temperature inside buildings.

[0025] (1) Winter medium circulation process of energy storage heat source system: In winter, user terminals have a large demand for heating. In order to improve energy utilization, valves 1 and 4 are closed, and valves 2 and 3 are opened. The heat generated during the operation of the electrochemical energy storage in the battery system 1 is transferred to the cooling medium, and the cooling medium is sent to the output end heat exchanger 15 in the heat pump system through the heat medium pipeline, and the water transported into the output end heat exchanger 15 by the heat preservation water tank 17 is heated; the cooled cooling medium is sent to the temperature control valve 5 through the refrigerant pipeline, and after the temperature is detected by the temperature control valve 5 to meet the use requirements, it is sent to the cold liquid tank 3 for storage, and then sent back to the battery system 1 by the cold night pump 2 for cooling, thus achieving the goal of utilizing the waste heat from the operation of the electrochemical energy storage. If the temperature of the cooling medium detected by the temperature control valve 5 does not meet the cooling requirements of the electrochemical energy storage, the cooling medium is sent to the cooler 4 through the temperature control valve 5 for secondary cooling and then stored in the cold liquid tank 3, and then sent to the battery system 1 by the cold night pump 2 for cooling.

[0026] (2) Summer medium circulation process of energy storage heat source system: In summer, user terminals have a large amount of cooling demand. In order to reduce energy consumption, valves 2 and 3 are closed, and valves 1 and 4 are opened. The heat generated during the operation of the electrochemical energy storage of the battery system 1 is transferred to the cooling medium, and the cooling medium is sent to the geothermal source buried pipe system 10 through the heat medium pipeline. The cooling medium is cooled by taking advantage of the fact that the temperature of underground soil or surface water or groundwater is lower than the ambient temperature. The cooled cooling medium passes through the refrigerant pipeline, and after the temperature is detected by the temperature control valve 5 to meet the use requirements, it is sent to the cold liquid tank 3 for storage, and then sent to the battery system 1 by the cold night pump 2 for cooling. If the temperature of the cooling medium detected by the temperature control valve 5 does not meet the cooling requirements of the electrochemical energy storage, the cooling medium is sent to the cooler 4 through the temperature control valve 5 for secondary cooling and then stored in the cold liquid tank 3, and then sent to the battery system 1 by the cold night pump 2 for cooling.

[0027] (3) Heat pump working medium circulation process: In winter, the battery system 1 works in the winter medium circulation process state of the energy storage heat source system. If the heat generated during the operation of the battery system 1 meets the heating demand of the user terminal, it is not necessary to start the heat pump working medium circulation process; if the heat generated during the operation of the battery system 1 does not meet the heating demand of the user terminal, it is necessary to start the heat pump working medium circulation process. The heat pump working medium in this working condition flows forward. The heat in the heat pump working medium circulation process is taken from the ground source heat. The ground source heat here already includes two parts, one part is the original geothermal heat of nature, and the other part is the waste heat retained in the ground by the battery system 1 through the summer medium circulation process of the energy storage heat source system. The heat pump working medium absorbs the ground source heat in the ground source buried pipe system 10 through the input end heat exchanger 12. After absorbing the ground source heat, the heat pump working medium evaporates into gas, and is then pressurized into high temperature and high pressure gas by the compressor 13. These high temperature and high pressure gases enter the output end heat exchanger 15, heat the liquid transported into the output end heat exchanger 15 by the thermal insulation water tank 17, and release heat to the building heating system. After releasing heat, the working medium of the heat pump changes into a low-temperature liquid, and then changes into a low-pressure liquid through throttling and pressure reduction by the thermal expansion valve 14 and enters the input end heat exchanger 12. This cycle "transports" underground heat, thereby continuously meeting the heating needs of user terminals.

[0028] In summer, considering that the underground temperature is relatively stable, usually between 5°C and 20°C, it can provide a stable source of cold for the user terminal and the battery system 1 at the same time. The battery system 1 works in the summer medium circulation process state of the energy storage heat source system. The heat generated during the operation of the battery system 1 no longer enters the output end heat exchanger 15, but directly enters the geothermal source vertical buried pipe system 10 through the valve for heat dissipation. For details of this process, see the summer medium circulation process of the energy storage heat source system. The cooling demand of the user terminal is met by the reverse flow of the heat pump working medium, that is, the heat pump working medium absorbs the heat of the water in the insulation water tank 17 through the output end heat exchanger 15, so that the water temperature in the insulation water tank 17 is reduced, and the heat pump working medium itself evaporates into gas to complete the heat exchange process. The heat pump working medium that has become a high-temperature gas is pressurized by the compressor 13 into a high-temperature and high-pressure gas and enters the input end heat exchanger 12, exchanges heat with the low-temperature medium in the geothermal source buried pipe system 10, completes the condensation process, and then passes through the expansion valve 14 to throttle and reduce the pressure to become a low-temperature and low-pressure liquid and enter the output end heat exchanger 15. This cycle "transports" the underground cold, thereby continuously meeting the cooling needs of user terminals.

[0029] (4) Underground heat exchange medium circulation: Taking advantage of the fact that the temperature of underground soil or surface water or groundwater is lower than the ambient temperature in summer and higher than the ambient temperature in winter, the heat of the user terminal is absorbed by the reverse circulation of the working medium of the heat pump in summer (for details, see the working medium circulation process of the heat pump in summer), and after being combined with the electrochemical energy storage heat (for details, see the medium circulation process of the energy storage heat source system in summer), it is transferred to the geothermal source buried pipe system 10 through the heat medium pipeline to cool the battery system 1 and the user terminal, and at the same time store the waste heat generated by the battery system 1 for winter use.

[0030] In winter, the heat in the underground soil is transferred to the user terminal through the positive circulation of the heat pump working medium (for details, please refer to the heat pump working medium circulation process in winter) to heat the user terminal and store cold energy for summer use. The earth's soil provides a good source of free energy storage, thus realizing the seasonal conversion of energy.

[0031] (5) User terminal system: mainly refers to the energy demand of users. Through the water pump 16, the water in the insulated water tank 17 is exchanged with the output end heat exchanger 15 of the heat pump system to provide users with domestic hot water, air conditioning, floor heating, etc. to realize the utilization of heat gradient. The water in the insulated water tank 17 can be replenished with tap water.

[0032] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. An electrochemical energy storage waste heat closed cycle comprehensive utilization system, comprising an electrochemical energy storage heat source system and a geothermal source buried pipe system, wherein the electrochemical energy storage heat source system comprises a battery system; characterized in that: It also includes a heat pump system and a user terminal system; the electrochemical energy storage heat source system also includes a cold liquid tank, a cooler, a temperature control valve, a valve No. 1, a valve No. 2, a valve No. 3 and a valve No. 4; the heat pump system includes an input end heat exchanger, a compressor, an expansion valve and an output end heat exchanger; the user terminal system includes a thermal insulation water tank; The hot runner outlet of the input-end heat exchanger is connected to the inlet of the geothermal source buried pipe system; the outlet of the geothermal source buried pipe system is divided into two routes, one route is connected to the hot runner inlet of the input-end heat exchanger, and the other route is connected to the inlet of the temperature control valve through the No. 4 valve; the inlet of the compressor is connected to the cold runner outlet of the input-end heat exchanger, the outlet of the compressor is connected to the first hot runner inlet of the output-end heat exchanger, and the first hot runner outlet of the output-end heat exchanger is connected to the cold runner inlet of the input-end heat exchanger through the expansion valve; the cold runner inlet and the cold runner outlet of the output-end heat exchanger are connected. The outlets are all connected to the insulation water tank; the cooling medium outlet of the battery system is divided into two routes, one route is connected to the inlet of the geothermal source buried pipe system through valve No. 1, and the other route is connected to the inlet of the second hot runner of the output end heat exchanger through valve No. 2, and the outlet of the second hot runner of the output end heat exchanger is connected to the inlet of the temperature control valve through valve No. 3; the first outlet of the temperature control valve is connected to the inlet of the cold liquid tank, and the outlet of the cold liquid tank is connected to the cooling medium inlet of the battery system; the second outlet of the temperature control valve is connected to the inlet of the cooler, and the outlet of the cooler is connected to the inlet of the cold liquid tank.

2. The electrochemical energy storage waste heat closed cycle comprehensive utilization system according to claim 1 is characterized by: The electrochemical energy storage heat source system also includes a cold liquid pump, and the outlet of the cold liquid tank is connected to the cooling medium inlet of the battery system through the cold liquid pump.

3. The electrochemical energy storage waste heat closed cycle comprehensive utilization system according to claim 1 is characterized by: The heat pump system further comprises a liquid extraction pump, and one path of the outlet of the geothermal source buried pipe system is connected to the hot runner inlet of the input end heat exchanger through the liquid extraction pump.

4. The electrochemical energy storage waste heat closed cycle comprehensive utilization system according to claim 1 is characterized by: The heat pump system also includes a water pump, and the cold flow channel inlet of the output end heat exchanger is connected to the insulation water tank through the water pump.

5. The electrochemical energy storage waste heat closed cycle comprehensive utilization system according to claim 1 is characterized by: The valve No. 1, valve No. 2, valve No. 3 and valve No. 4 are all electric valves.

6. A working method of the electrochemical energy storage waste heat closed cycle comprehensive utilization system according to any one of claims 1 to 5, characterized in that: Including the winter medium circulation process of the energy storage heat source system and the summer medium circulation process of the energy storage heat source system; (1) Winter medium circulation process of energy storage heat source system: In winter, the user terminal has a large demand for heating, and valves No. 1 and No. 4 are closed, and valves No. 2 and No. 3 are opened; the heat generated during the operation of the battery system is transferred to the cooling medium, and the cooling medium is sent to the output end heat exchanger of the heat pump system to heat the water transported into the output end heat exchanger in the insulation water tank; the cooled cooling medium is sent to the temperature control valve, and after the temperature control valve detects that the temperature meets the use requirements, it is sent to the cold liquid tank for storage, and then sent back to the battery system for cooling; if the temperature control valve detects that the cooling medium temperature does not meet the electrochemical energy storage cooling requirements, the cooling medium is sent to the cooler through the temperature control valve for secondary cooling and then stored in the cold liquid tank, and then sent to the battery system for cooling; (2) Summer medium circulation process of the energy storage heat source system: In summer, the user terminal has a large demand for cooling, so valves No. 2 and No. 3 are closed and valves No. 1 and No. 4 are opened; the heat generated during the operation of the battery system is transferred to the cooling medium, and the cooling medium is sent to the geothermal source buried pipe system to cool the cooling medium; after the cooled cooling medium is tested by the temperature control valve and the temperature meets the use requirements, it is sent to the cold liquid tank for storage and then sent to the battery system for cooling; if the temperature control valve detects that the cooling medium temperature does not meet the electrochemical energy storage cooling requirements, the cooling medium is sent to the cooler through the temperature control valve for secondary cooling and then stored in the cold liquid tank, and then sent to the battery system for cooling.

7. The working method according to claim 6, characterized in that: It also includes the heat pump working medium circulation process: In winter, if the heat generated during the operation of the battery system does not meet the heating demand of the user terminal, it is necessary to start the heat pump working medium circulation process. The heat pump working medium in this working condition flows forward, and the heat in the heat pump working medium circulation process is taken from the ground source heat. The ground source heat here already includes two parts, one is the original geothermal heat of nature, and the other is the waste heat retained in the ground by the battery system through the summer medium circulation process of the energy storage heat source system; the heat pump working medium absorbs the ground source heat in the ground source buried pipe system through the input end heat exchanger; the heat pump working medium after absorbing the ground source heat evaporates into gas, and is then pressurized into high-temperature and high-pressure gas by the compressor. These high-temperature and high-pressure gases enter the output end heat exchanger to heat the liquid transported into the output end heat exchanger by the insulation water tank; the heat pump working medium after releasing the heat itself changes into a low-temperature liquid, and then changes into a low-pressure liquid through throttling and pressure reduction by the thermal expansion valve and enters the input end heat exchanger; In summer, the battery system works in the summer medium circulation process state of the energy storage heat source system. The heat generated during the operation of the battery system no longer enters the output end heat exchanger, but directly enters the geothermal source vertical buried pipe system for heat dissipation; and the cooling demand of the user terminal is met by the reverse flow of the heat pump working medium, that is, the heat pump working medium absorbs the heat of the water in the insulated water tank through the output end heat exchanger, so that the water temperature in the insulated water tank is reduced, and the heat pump working medium itself evaporates into gas, completing the heat exchange process; the heat pump working medium that has become high-temperature gas is pressurized by the compressor into high-temperature and high-pressure gas and enters the input end heat exchanger, exchanges heat with the low-temperature medium in the geothermal source buried pipe system, completes the condensation process, and then passes through the expansion valve to throttle and reduce the pressure to become a low-temperature and low-pressure liquid and enter the output end heat exchanger.

8. The working method according to claim 6, characterized in that: The water in the insulated water tank is heat exchanged with the output end heat exchanger in the heat pump system, and the water in the insulated water tank is provided to the user to realize the utilization of heat gradient; the water in the insulated water tank can be replenished with tap water.

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