A thermal management system and method for an energy storage power plant

Abstract

The application provides a thermal management system and method of an energy storage power station, the temperature of an energy storage battery is acquired, when the temperature of the energy storage battery is lower than a preset temperature value, the energy storage battery is heated by using a heat exchange medium in an inner circulation system after heat exchange with a heat exchange medium in an outer heat circulation system, when the temperature of the energy storage battery is higher than the preset temperature value, the energy storage battery is cooled by using the heat exchange medium in the inner circulation system after heat exchange with a heat exchange medium in an outer cold circulation system, the heat exchange medium output by the outer cold circulation system or the outer heat circulation system is used to exchange heat with a battery chamber according to the temperature of the battery chamber, and the battery chamber is kept warm, in the scheme, the energy storage battery is heated or cooled by using the outer cold circulation system and the outer heat circulation system with low energy consumption, and the battery chamber is kept warm by combining an ambient temperature control system, so that high energy consumption modes such as air conditioners or electric heating are avoided, and the purposes of improving thermal management efficiency, reducing cost and saving energy consumption are achieved.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology, specifically to a thermal management system and method for an energy storage power station. Background Technology

[0002] To improve the cycle performance and number of cycles of lithium-ion batteries and avoid issues such as thermal runaway that could affect the safety of energy storage systems, precise thermal management of lithium-ion batteries is necessary during use. For lithium iron phosphate batteries, the battery operates best in the temperature range of 25–45°C. However, the battery generates a lot of heat during operation, and the battery has certain temperature requirements for starting. Temperatures that are too low or too high can prevent the battery from starting and thus prevent it from responding to grid dispatch. Therefore, all lithium-ion battery energy storage systems must be equipped with a thermal management system.

[0003] In existing thermal management systems, there are mainly two solutions: air cooling and liquid cooling. The main problems with air cooling are large temperature differences between different batteries and high air conditioning energy consumption. In particular, during winter heating operations, the liquid cooling medium is heated electrically in low temperatures, which is inefficient and consumes a lot of energy, increasing the operating cost of the energy storage power station.

[0004] Therefore, how to solve the problems of low thermal management efficiency, high energy consumption and high cost in the existing thermal management system is an urgent problem to be solved. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a thermal management system and method for an energy storage power station, so as to improve thermal management efficiency, reduce costs and save energy consumption.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] The first aspect of this invention discloses a thermal management system for an energy storage power station. The system includes: an internal circulation system, an external cooling circulation system, an external heating circulation system, a heating heat exchanger, a cooling heat exchanger, an ambient temperature control system disposed in a battery room, and a liquid cooling plate in contact with the energy storage battery. The battery room includes one or more energy storage battery cabinets, and the energy storage battery is stored in the energy storage battery cabinets.

[0008] The internal circulation system connects the heating heat exchanger, the cooling heat exchanger, and the liquid cooling plate;

[0009] The external heat circulation system is connected to the heating heat exchanger and the ambient temperature control system;

[0010] The external cooling circulation system is connected to the refrigeration heat exchanger and the ambient temperature control system;

[0011] The pipes in the internal circulation system, the external cold circulation system, and the external heat circulation system each contain flowing heat exchange media.

[0012] The external cooling circulation system is used to input the heat exchange medium after cooling circulation treatment into the refrigeration heat exchanger and the ambient temperature control system, and to perform the cooling circulation treatment on the heat exchange medium after heat exchange output by the refrigeration heat exchanger and the ambient temperature control system.

[0013] The external heat circulation system is used to input the heat exchange medium after heat circulation treatment into the heating heat exchanger and the ambient temperature control system, and to perform the heat circulation treatment on the heat exchange medium after heat exchange output by the cooling heat exchanger and the ambient temperature control system.

[0014] The ambient temperature control system is used to acquire and, based on the temperature of the battery compartment, exchange heat with the battery compartment using the heat exchange medium input from the external cooling circulation system to cool the battery compartment, or to exchange heat with the battery compartment using the heat exchange medium input from the external heating circulation system to heat the battery compartment.

[0015] The internal circulation system is used to acquire the temperature of the energy storage battery. When the temperature of the energy storage battery is lower than a preset temperature value, the heat exchange medium in the internal circulation system exchanges heat with the heat exchange medium in the external heat circulation system in the heating heat exchanger, and the heat exchange medium and the liquid cooling plate after heat exchange are used to heat the energy storage battery. When the temperature of the energy storage battery is higher than the preset temperature value, the heat exchange medium in the internal circulation system exchanges heat with the heat exchange medium in the external cooling circulation system in the cooling heat exchanger, and the heat exchange medium and the liquid cooling plate after heat exchange are used to cool the energy storage battery.

[0016] Preferably, the internal circulation system includes: a first electric butterfly valve, a second electric butterfly valve, a control component, a gate valve, a first internal circulation pump, and a second internal circulation pump;

[0017] One end of the first electric butterfly valve is connected to the internal circulation output end of the heating heat exchanger via the first internal circulation pump, and one end of the second electric butterfly valve is connected to the internal circulation output end of the refrigeration heat exchanger via the second internal circulation pump. The other ends of the first electric butterfly valve and the other ends of the second electric butterfly valve are connected to form a first common end.

[0018] One end of the liquid cooling plate is connected to the first common end, and the other end of the liquid cooling plate is connected to the second common end. The second common end is formed by connecting the internal circulation input end of the heating heat exchanger and the internal circulation input end of the refrigeration heat exchanger.

[0019] The control components are respectively communicatively connected to the first electric butterfly valve, the second electric butterfly valve, the first internal circulation pump, and the second internal circulation pump;

[0020] One end of the gate valve is connected to the first common terminal, and the other end is connected to the second common terminal;

[0021] The control component is used to acquire the temperature of the energy storage battery; when the temperature of the energy storage battery is lower than a preset temperature value, it controls the first electric butterfly valve and the first internal circulation pump to open, using the first internal circulation pump to provide power to deliver the heat exchange medium to the heating heat exchanger, where it exchanges heat with the heat exchange medium in the external heat circulation system, and uses the heat exchange medium after heat exchange and the liquid cooling plate to heat the energy storage battery; when the temperature of the energy storage battery is higher than the preset temperature value, it controls the second electric butterfly valve and the second internal circulation pump to open, using the second internal circulation pump to provide power to deliver the heat exchange medium to the cooling heat exchanger, where it exchanges heat with the heat exchange medium in the external cooling circulation system, and uses the heat exchange medium after heat exchange and the liquid cooling plate to cool the energy storage battery;

[0022] The gate valve is used to control the flow rate of the heat exchange medium after heat exchange into the liquid cooling plate.

[0023] Preferably, the external heat circulation system includes: a heating pipeline network, a local heat exchange station, and a first external circulation pump;

[0024] The heating pipeline network is connected to the local heat exchange station;

[0025] The output end of the local heat exchange station is connected to the external circulation input end of the heating heat exchanger via the first external circulation pump.

[0026] The input end of the local heat exchange station is connected to the external circulation output end of the heating heat exchanger;

[0027] The heating network is used to heat the heat exchange medium to obtain a high-temperature heat exchange medium and transport it to the local heat exchange station.

[0028] The local heat exchange station is used to adjust the temperature, pressure and flow rate of the high-temperature heat exchange medium to obtain the heat exchange medium that meets the requirements, and to transport it to the heating heat exchanger to exchange heat with the heat exchange medium in the internal circulation system to obtain a low-temperature heat exchange medium and transport it back to the heating network.

[0029] The first external circulation pump is used to provide power for conveying the low-temperature heat exchange medium and the high-temperature heat exchange medium.

[0030] Preferably, the external cooling circulation system includes: a water-cooled unit, an air-cooled unit, and a second external circulation pump;

[0031] The water-cooled unit is connected to the air-cooled unit;

[0032] The output end of the water-cooled unit is connected to the external circulation input end of the refrigeration heat exchanger via the second external circulation pump.

[0033] The input end of the water-cooled unit is connected to the external circulation output end of the refrigeration heat exchanger;

[0034] The water-cooled unit is used to dissipate heat from the heat exchange medium using a compressor when the outside temperature is higher than the preset temperature, so as to obtain a low-temperature heat exchange medium that is delivered to the refrigeration heat exchanger to exchange heat with the heat exchange medium in the internal circulation system, thereby obtaining a high-temperature heat exchange medium and performing the same heat dissipation treatment; when the outside temperature is lower than the preset temperature, the high-temperature heat exchange medium is delivered to the air-cooled unit.

[0035] The air-cooled unit uses air to dissipate heat from the high-temperature heat exchange medium, and then returns the low-temperature heat exchange medium to the water-cooled unit.

[0036] The second external circulation pump is used to provide power for conveying the low-temperature heat exchange medium and the high-temperature heat exchange medium.

[0037] Preferably, the system further includes: a pressure regulating device connected to the internal circulation system via a pipeline;

[0038] The pressure regulating device is used to detect the pressure of the heat exchange medium in the internal circulation system in real time, and when the pressure is lower than the preset pressure value, it replenishes the heat exchange medium to the internal circulation system.

[0039] Preferably, the system further includes: a filter disposed in the internal circulation system pipeline;

[0040] The filter is used to filter impurities in the heat exchange medium of the internal circulation system.

[0041] Preferably, the system further includes: a heater disposed in the internal circulation system pipeline;

[0042] The heater is used to heat the heat exchange medium in the internal circulation system when the external heat circulation system fails.

[0043] Preferably, the heat exchange medium in the external cooling circulation system comprises a mixture of water and ethylene glycol.

[0044] Preferably, the heat exchange medium in the external heat circulation system and the internal circulation system includes water.

[0045] A second aspect of this invention discloses a thermal management method for an energy storage power station, applicable to the thermal management system of the energy storage power station according to any one of claims 1 to 9, the method comprising:

[0046] The temperature of the energy storage battery and the temperature of the battery compartment are obtained;

[0047] Depending on the temperature of the battery compartment, the heat exchange medium output by the external cooling circulation system is used to exchange heat with the battery compartment to cool it down, or the heat exchange medium output by the external heating circulation system is used to exchange heat with the battery compartment to heat it up.

[0048] When the temperature of the energy storage battery is lower than the preset temperature value, the heat exchange medium in the internal circulation system is used to exchange heat with the heat exchange medium in the external heat circulation system in the heating heat exchanger.

[0049] The energy storage battery is heated by the heat exchange medium after heat exchange in the heating heat exchanger and the liquid cooling plate in the internal circulation system.

[0050] When the temperature of the energy storage battery is higher than the preset temperature value, the heat exchange medium in the internal circulation system is used to exchange heat with the heat exchange medium in the external cooling circulation system in the refrigeration heat exchanger.

[0051] The energy storage battery is cooled by the heat exchange medium after heat exchange in the refrigeration heat exchanger and the liquid cooling plate in the internal circulation system.

[0052] A thermal management system and method for an energy storage power station, based on the above embodiments of the present invention, includes: an internal circulation system, an external cold circulation system, an external heat circulation system, a heating heat exchanger, a cooling heat exchanger, an ambient temperature control system disposed in a battery room, and a liquid cooling plate in contact with the energy storage battery; the battery room includes one or more energy storage battery cabinets, and the energy storage battery is stored in the energy storage battery cabinets; the internal circulation system connects the heating heat exchanger, the cooling heat exchanger, and the liquid cooling plate; the external heat circulation system connects the heating heat exchanger and the ambient temperature control system; the external cold circulation system connects the cooling heat exchanger and the ambient temperature control system; flowing heat exchange media exist in the pipes of the internal circulation system, the external cold circulation system, and the external heat circulation system; the external cold circulation system is used to input the heat exchange media after cold circulation treatment into the cooling heat exchanger and the ambient temperature control system, and to perform the cold circulation treatment on the heat exchange media after heat exchange output by the cooling heat exchanger and the ambient temperature control system; the external heat circulation system is used to input the heat exchange media after cold circulation treatment into the heating heat exchanger and the ambient temperature control system. The system inputs the heat exchange medium after heat circulation treatment, and performs heat circulation treatment on the heat exchange medium after heat exchange between the refrigeration heat exchanger and the ambient temperature control system. The ambient temperature control system is used to acquire and, based on the temperature of the battery compartment, use the heat exchange medium input from the external cooling circulation system to exchange heat with the battery compartment to cool the battery compartment, or use the heat exchange medium input from the external cooling circulation system to exchange heat with the battery compartment to heat the battery compartment. The internal circulation system is used to acquire the temperature of the energy storage battery. When the temperature of the energy storage battery is lower than a preset temperature value, the heat exchange medium in the internal circulation system exchanges heat with the heat exchange medium in the external cooling circulation system in the heating heat exchanger, and uses the heat exchange medium after heat exchange and the liquid cooling plate to heat the energy storage battery. When the temperature of the energy storage battery is higher than the preset temperature value, the heat exchange medium in the internal circulation system exchanges heat with the heat exchange medium in the external cooling circulation system in the refrigeration heat exchanger, and uses the heat exchange medium after heat exchange and the liquid cooling plate to cool the energy storage battery. In this solution, a low-energy external cooling circulation system and an external heating circulation system are used to heat or cool the energy storage battery. Combined with an ambient temperature control system, the battery compartment is kept warm, avoiding the use of high-energy-consuming methods such as air conditioning or electric heating. This achieves the goal of improving thermal management efficiency, reducing costs and saving energy. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0054] Figure 1 This is an architectural diagram of a thermal management system for an energy storage power station disclosed in an embodiment of the present invention;

[0055] Figure 2 This is an architectural diagram of another thermal management system for an energy storage power station disclosed in an embodiment of the present invention;

[0056] Figure 3 This is a flowchart of a thermal management method for an energy storage power station disclosed in an embodiment of the present invention. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0059] As can be seen from the background technology, there are two main solutions in the existing thermal management system: air cooling and liquid cooling. The main problems with the air cooling solution are large temperature differences between different batteries and high air conditioning energy consumption. Especially in winter heating conditions, the method of electric heating liquid cooling medium is used in low winter temperatures. This method is inefficient and consumes a lot of energy, which increases the operating cost of energy storage power stations.

[0060] Therefore, this invention discloses a thermal management system and method for an energy storage power station. In this solution, a low-energy-consumption external cooling circulation system and an external heating circulation system are used to heat or cool the energy storage battery. Combined with an ambient temperature control system, the battery compartment is kept warm, avoiding the use of high-energy-consumption methods such as air conditioning or electric heating to control the temperature of the energy storage battery. This achieves the goal of improving thermal management efficiency, reducing costs, and saving energy.

[0061] like Figure 1 The diagram shown is an architecture diagram of a thermal management system for an energy storage power station disclosed in an embodiment of the present invention. The thermal management system includes: an internal circulation system 100, an external cooling circulation system 200, an external heating circulation system 300, a heating heat exchanger 400, a cooling heat exchanger 500, an ambient temperature control system 600, and a liquid cooling plate 700 in contact with the energy storage battery.

[0062] An ambient temperature control system 600 is located in the battery room, which contains one or more energy storage battery cabinets, each storing an energy storage battery.

[0063] The internal circulation system 100 is connected to the heating heat exchanger 400, the cooling heat exchanger 500, and the liquid cooling plate 700.

[0064] The external heat circulation system 300 is connected to the heating heat exchanger 400 and the ambient temperature control system 600.

[0065] The external cooling circulation system 200 is connected to the refrigeration heat exchanger 500 and the ambient temperature control system 600.

[0066] The pipes in the internal circulation system 100, the external cold circulation system 200, and the external heat circulation system 300 contain circulating heat exchange media.

[0067] It should be noted that the heating heat exchanger 400 and the cooling heat exchanger 500 each have two output terminals and two input terminals, which are interconnected internal circulation output terminals and internal circulation input terminals, as well as interconnected external circulation output terminals and external circulation input terminals.

[0068] The heating heat exchanger 400 and the cooling heat exchanger 500 use plate heat exchangers, but can also be replaced with any heat exchange equipment, including but not limited to coils, shell and tube heat exchangers and tube-and-tube heat exchangers.

[0069] Based on the above description of the structures of the heating heat exchanger 400 and the cooling heat exchanger 500, it can be understood that although the internal circulation system 100, the external cooling circulation system 200, and the external heating circulation system 300 are directly or indirectly connected to each other through the cooling heat exchanger 500 or the heating heat exchanger 400, they are not connected to each other. In other words, the heat exchange medium in the internal circulation system 100, the external cooling circulation system 200, and the external heating circulation system 300 circulates independently and will not mix with the heat exchange medium of other systems. The heat exchange medium is only exchanged through the cooling heat exchanger 500 and the heating heat exchanger 400, i.e., heat exchange.

[0070] Specifically, the output end of the internal circulation system 100 is connected to the internal circulation input end of the heating heat exchanger 400, and the input end of the internal circulation system 100 is connected to the internal circulation output end of the heating heat exchanger 400.

[0071] The internal circulation system 100 is used to obtain the temperature of the energy storage battery;

[0072] When the temperature of the energy storage battery is lower than the preset temperature value, the heat exchange medium in the internal circulation system 100 is used to exchange heat with the heat exchange medium in the external heat circulation system 300 in the heating heat exchanger 400, and the heat exchange medium after heat exchange and the liquid cooling plate 700 are used to heat the energy storage battery.

[0073] When the temperature of the energy storage battery is higher than the preset temperature value, the heat exchange medium in the internal circulation system 100 is used to exchange heat with the heat exchange medium in the external cooling circulation system 200 in the cooling heat exchanger 500, and the energy storage battery is cooled by the heat exchange medium after heat exchange and the liquid cooling plate 700.

[0074] It is understandable that the liquid cooling plate 700 is in contact with the energy storage battery. The liquid cooling plate 700 acts as a heat conduction medium, transferring the heat from the heat exchange medium in the internal circulation system 100 to the energy storage battery, or transferring the heat from the energy storage battery to the heat exchange medium in the internal circulation system 100.

[0075] It should be noted that the preset temperature value is determined according to the actual situation within the temperature range of 25℃ to 45℃. Alternatively, the preset temperature value can be replaced with a preset temperature range, that is, if the temperature is higher than the preset temperature range, cooling will be performed, and if the temperature is lower than the preset temperature range, heating will be performed, so that the energy storage battery is kept in the temperature range of 25℃ to 45℃.

[0076] The external cooling circulation system 200 is used to input the heat exchange medium after cooling circulation into the refrigeration heat exchanger 500 and the ambient temperature control system 600, and to perform cooling circulation on the heat exchange medium after heat exchange output from the refrigeration heat exchanger 500 and the ambient temperature control system 600.

[0077] In a specific implementation, the heat exchange medium after cold circulation is input into the refrigeration heat exchanger 500, and heat exchange is performed with the heat exchange medium in the internal circulation system 100. The heat exchange medium after heat exchange is then subjected to cold circulation.

[0078] And for supplying the low-temperature heat exchange medium obtained after the heat exchange medium has been cold-circulated to the ambient temperature control system 600, using the low-temperature heat exchange medium to exchange heat with the battery chamber, and cold-circulating the high-temperature heat exchange medium obtained from the heat exchange.

[0079] In one embodiment, the external cooling circulation system 200 consists of an air-cooled unit and a water-cooled unit connected to each other.

[0080] Specifically, the output end of the water chiller is connected to the external circulation input end of the refrigeration heat exchanger 500, the input end of the water chiller is connected to the external circulation output end of the refrigeration heat exchanger 500, another branch from the output end of the water chiller is connected to the input end of the ambient temperature control system 600, and the output end of the ambient temperature control system 600 is connected to the input end of the water chiller.

[0081] The cold cycle process is as follows:

[0082] The heat exchange medium in the external cooling circulation system 200 absorbs heat from the high-temperature heat exchange medium in the internal circulation system 100 in the refrigeration heat exchanger 500, or absorbs heat from the battery compartment in the ambient temperature control system 600, to obtain a high-temperature heat exchange medium. Then, the high-temperature heat exchange medium is cooled by an air-cooled unit or a water-cooled unit to obtain a low-temperature heat exchange medium. Finally, the low-temperature heat exchange medium is transported back to the refrigeration heat exchanger 500 to achieve cold circulation processing.

[0083] The heat dissipation process of air-cooled units and water-cooled units is as follows:

[0084] When the ambient temperature is lower than the preset temperature, the external cooling circulation system 200 uses the air-cooled unit to dissipate heat. The air-cooled unit uses low-temperature air to absorb the heat from the high-temperature heat exchange medium output from the heat exchanger, thus obtaining a low-temperature heat exchange medium.

[0085] When the ambient temperature is higher than the preset temperature, the external cooling circulation system 200 uses a water-cooled unit to dissipate heat. The water-cooled unit turns on the compressor to absorb the heat from the high-temperature heat exchange medium output from the heat exchanger, thus obtaining a low-temperature heat exchange medium.

[0086] Correspondingly, an ambient temperature control system 600, used to acquire and adjust the battery compartment temperature based on the temperature of the battery compartment, utilizes the heat exchange medium input from the external cooling circulation system 200 to exchange heat with the battery compartment, thereby cooling the battery compartment, or utilizes the heat exchange medium input from the external heating circulation system 300 to exchange heat with the battery compartment, thereby heating the battery compartment, is specifically used for:

[0087] The temperature of the battery compartment is obtained. When the temperature of the battery compartment exceeds the preset temperature range of the battery compartment, a low-temperature heat exchange medium is used to exchange heat with the battery compartment to cool down the battery compartment.

[0088] Preferably, the preset temperature range of the battery compartment is 23℃-28℃.

[0089] Preferably, water is used as the heat exchange medium in the internal circulation system 100 and the external heat circulation system 300, and a mixture of water and ethylene glycol is used as the heat exchange medium in the external cold circulation system 200, which can prevent freezing in winter.

[0090] Preferably, a second external circulation pump is installed in the piping of the external cooling circulation system 200, and the output end of the water-cooled unit is connected to the external circulation input end of the refrigeration heat exchanger 500 via the second external circulation pump.

[0091] The second external circulation pump is used to provide power for the transfer of heat exchange medium in water-cooled and air-cooled units.

[0092] The external heat circulation system is used to input the heat exchange medium after heat circulation treatment into the heating heat exchanger 400 and the ambient temperature control system 600, and to perform heat circulation treatment on the heat exchange medium after heat exchange output from the cooling heat exchanger 400 and the ambient temperature control system 600.

[0093] In a specific implementation, the heat exchange medium after heat circulation is input into the heating heat exchanger 400, and heat exchange is performed with the heat exchange medium in the internal circulation system 100. The heat exchange medium after heat exchange is then subjected to heat circulation treatment.

[0094] And for supplying a high-temperature heat exchange medium obtained by heat exchange medium thermal cycling treatment to an ambient temperature control system 600, using the high-temperature heat exchange medium to exchange heat with the battery chamber, and performing thermal cycling treatment on the low-temperature heat exchange medium obtained by heat exchange.

[0095] In one embodiment, the external heat circulation system 300 is composed of a heating network connected to a local heat exchange station.

[0096] Specifically, the output end of the local heat exchange station is connected to the external circulation input end of the heating heat exchanger 400, the input end of the local heat exchange station is connected to the external circulation output end of the heating heat exchanger 400, another branch from the output end of the local heat exchange station is connected to the input end of the ambient temperature control system 600, and the output end of the ambient temperature control system 600 is connected to the input end of the local heat exchange station.

[0097] The thermal cycling process is as follows:

[0098] The heat source of the external heat circulation system 300 comes from the heating network or boiler. Since the heat exchange medium in the heating network is usually at a high temperature and the temperature, pressure and flow rate are unstable, it is not suitable to be directly supplied to the heating heat exchanger 400 and the ambient temperature control system 600. Therefore, the heating network supplies the heated high-temperature heat exchange medium to the local heat exchange station. The local heat exchange station adjusts the high-temperature heat exchange medium to a suitable temperature, pressure and flow rate to obtain a heat exchange medium that meets the requirements.

[0099] The local heat exchange station delivers the qualified heat exchange medium to the heating heat exchanger 400 and the ambient temperature control system 600, so that the qualified heat exchange medium can exchange heat with the heat exchange medium in the internal circulation system 100 and the battery chamber. The low-temperature heat exchange medium obtained after heat exchange is re-input into the heating network through the local heat exchange station for heating, thereby realizing heat circulation.

[0100] Preferably, the heat exchange medium in the external heat circulation system 300 is water, and the required temperature range of the heat exchange medium is 50℃-60℃.

[0101] Correspondingly, an ambient temperature control system 600, used to acquire and adjust the battery compartment temperature based on the temperature of the battery compartment, utilizes the heat exchange medium input from the external cooling circulation system 200 to exchange heat with the battery compartment, thereby cooling the battery compartment, or utilizes the heat exchange medium input from the external heating circulation system 300 to exchange heat with the battery compartment, thereby heating the battery compartment, is specifically used for:

[0102] The temperature of the battery compartment is obtained. When the temperature of the battery compartment is lower than the preset temperature range of the battery compartment, a high-temperature heat exchange medium is used to exchange heat with the battery compartment, so that the temperature of the battery compartment is raised.

[0103] Preferably, a second external circulation pump is installed in the pipeline of the external heat circulation system 300, and the output end of the local heat exchange station is connected to the external circulation input end of the heating heat exchanger via the first external circulation pump.

[0104] The second external circulation pump is used to provide power for conveying low-temperature and high-temperature heat exchange media.

[0105] According to the above-described embodiments of the present invention, a thermal management system for an energy storage power station includes the following steps: When the temperature of the energy storage battery is lower than a preset temperature value, the heat exchange medium in the internal circulation system exchanges heat with the heat exchange medium in the external heat circulation system in a heating heat exchanger; the heat exchange medium after heat exchange in the heating heat exchanger and the liquid cooling plate in the internal circulation system heat the energy storage battery; when the temperature of the energy storage battery is higher than the preset temperature value, the heat exchange medium in the internal circulation system exchanges heat with the heat exchange medium in the external cooling circulation system in a cooling heat exchanger; the heat exchange medium after heat exchange in the cooling heat exchanger and the liquid cooling plate in the internal circulation system cool the energy storage battery; depending on the temperature of the battery compartment, the heat exchange medium output from the external cooling circulation system exchanges heat with the battery compartment to cool the battery compartment, or the heat exchange medium output from the external heat circulation system exchanges heat with the battery compartment to heat the battery compartment. In this solution, a low-energy external cooling circulation system and an external heating circulation system are used to heat or cool the energy storage battery. Combined with an ambient temperature control system, the battery compartment is kept warm, avoiding the use of high-energy-consuming methods such as air conditioning or electric heating to control the temperature of the energy storage battery. This achieves the goal of improving thermal management efficiency, reducing costs and saving energy.

[0106] A thermal management system for an energy storage power station disclosed in the above embodiments of the present invention, such as Figure 2 The diagram shown is an architecture diagram of another thermal management system for an energy storage power station disclosed in an embodiment of the present invention.

[0107] Specifically, the internal circulation system 100 includes: a first electric butterfly valve 1, a second electric butterfly valve 2, a control component 3, a gate valve 4, a first internal circulation pump 5, and a second internal circulation pump 6.

[0108] One end of the first electric butterfly valve 1 is connected to the internal circulation output end of the heating heat exchanger 400 via the first internal circulation pump 5, and one end of the second electric butterfly valve 2 is connected to the internal circulation output end of the refrigeration heat exchanger 500 via the second internal circulation pump 6. The other ends of the first electric butterfly valve 1 and the other ends of the second electric butterfly valve 2 are connected to form the first common end.

[0109] One end of the liquid cooling plate 700 is connected to the first common end, and the other end of the liquid cooling plate 700 is connected to the second common end. The second common end is formed by connecting the internal circulation input end of the heating heat exchanger 400 and the internal circulation input end of the cooling heat exchanger 500.

[0110] It should be noted that when performing thermal management on multiple energy storage batteries, multiple liquid cooling plates 700 that come into contact with the energy storage batteries are required. For each liquid cooling plate 700, one end is connected to a branch leading out from the first common terminal, and the other end is connected to a branch leading out from the second common terminal.

[0111] The control component 3 is communicatively connected to the first electric butterfly valve 1, the second electric butterfly valve 2, the first internal circulation pump 5, and the second internal circulation pump 6, wherein the connection method is preferably wireless connection.

[0112] It should be noted that, except for the notes (e.g., communication connections), all connection relationships in the embodiments of the present invention are pipe connections.

[0113] The control component 3 is used to control the first electric butterfly valve 1 and the first internal circulation pump 5 to open when the temperature of the energy storage battery is lower than the preset temperature value, and at the same time, control the second electric butterfly valve 2 and the second internal circulation pump 6 to close.

[0114] Then, the first internal circulation pump 5 provides power to deliver the heat exchange medium to the heating heat exchanger 500, and the heat exchange medium in the heating heat exchanger 500 exchanges heat with the heat exchange medium in the external heat circulation system 300. The heat exchange medium after heat exchange and the liquid cooling plate 700 are used to heat the energy storage battery.

[0115] In the specific implementation process, the first internal circulation pump 5 transports the heat exchange medium in the internal circulation system 100 pipeline to the heating heat exchanger 500, where it exchanges heat with the heat exchange medium in the external heat circulation system 300. The heating heat exchanger 500 then transports the high-temperature heat exchange medium after heat exchange to the liquid cooling plate 700, which contacts the energy storage battery. This allows the heat in the high-temperature heat exchange medium to be transferred to the energy storage battery. After the heat transfer, the high-temperature heat exchange medium becomes a low-temperature heat exchange medium and is then reintroduced into the heating heat exchanger 500 by the first internal circulation pump 5, thus realizing the heating internal circulation process.

[0116] The control component 3 is used to control the second electric butterfly valve 2 and the second internal circulation pump 6 to open when the temperature of the energy storage battery is higher than the preset temperature value, and at the same time control the first electric butterfly valve 1 and the first internal circulation pump 5 to close.

[0117] Then, the second internal circulation pump 6 provides power to deliver the heat exchange medium to the refrigeration heat exchanger 500, and the heat exchange medium in the refrigeration heat exchanger 500 exchanges heat with the heat exchange medium in the external cooling circulation system 200. The heat exchange medium after heat exchange and the liquid cooling plate 700 are used to cool the energy storage battery.

[0118] In the specific implementation process, the second internal circulation pump 6 transports the heat exchange medium in the internal circulation system 100 pipeline to the refrigeration heat exchanger 400, where it exchanges heat with the heat exchange medium in the external cooling circulation system 200. The refrigeration heat exchanger 400 then transports the low-temperature heat exchange medium after heat exchange to the liquid cooling plate 700, which contacts the energy storage battery. This allows the low-temperature heat exchange medium to absorb heat from the energy storage battery. After absorption, the low-temperature heat exchange medium becomes a high-temperature heat exchange medium, which is then reintroduced into the refrigeration heat exchanger 400 by the second internal circulation pump 6, thus realizing the internal circulation process of refrigeration.

[0119] The control component 3 includes at least a controller and a temperature sensor. The controller is communicatively connected to the temperature sensor, the first electric butterfly valve 1, the second electric butterfly valve 2, the first internal circulation pump 5, and the second internal circulation pump 6. The temperature sensor is mounted on the energy storage battery.

[0120] Specifically, the controller determines whether the temperature of the energy storage battery is higher or lower than the preset temperature value based on the temperature detected by the temperature sensor, and then controls the first electric butterfly valve 1, the second electric butterfly valve 2, the first internal circulation pump 5 and the second internal circulation pump 6 to open or close.

[0121] In one embodiment, one end of the gate valve 4 is connected to a first common terminal, and the other end is connected to a second common terminal.

[0122] Gate valve 4 is used to control the flow rate of the heat exchange medium after heat exchange into the liquid cooling plate 700.

[0123] It should be noted that after the gate valve 4 is opened, the pipeline where the gate valve 4 is located is connected. If the first electric butterfly valve 1 is opened and the second electric butterfly valve 2 is closed, the internal circulation input end and the internal circulation output end of the heating heat exchanger 500 are connected, thereby reducing the flow rate of the high-temperature heat exchange medium flowing to the liquid cooling plate 700, reducing the speed of heating the energy storage battery, and avoiding the energy storage battery temperature from becoming too high.

[0124] If the first electric butterfly valve 1 is closed and the second electric butterfly valve 2 is opened, the internal circulation input end and the internal circulation output end of the refrigeration heat exchanger 400 are connected, thereby reducing the flow rate of the low-temperature heat exchange medium to the liquid cooling plate 700, reducing the cooling speed of the energy storage battery, and preventing the energy storage battery temperature from becoming too low.

[0125] By controlling the opening degree of gate valve 4, the flow rate of low-temperature or high-temperature heat exchange medium flowing through liquid cooling plate 700 can be controlled more precisely.

[0126] In one embodiment, a pipe branch is drawn from the inner circulation input end and the inner circulation output end of the heating heat exchanger 500 to connect the inner circulation input end and the inner circulation output end of the heating heat exchanger 500, and an electric gate valve 7 is installed in the connected pipe.

[0127] The electric gate valve 7 is used to control the opening or closing of the pipeline connecting the inner circulation input end and the inner circulation output end of the heating heat exchanger 500, thereby controlling the flow rate of the heat exchange medium flowing into the heating heat exchanger 500 from the inner circulation system 100 and realizing the control of the heat exchange speed.

[0128] In one embodiment, a pipe branch is drawn from the external circulation input end and the external circulation output end of the heating heat exchanger 500 to connect the external circulation input end and the external circulation output end of the heating heat exchanger 500, and an electric gate valve 8 is installed in the connected pipe.

[0129] The electric gate valve 8 is used to control the opening or closing of the pipeline connecting the external circulation input end and the internal circulation output end of the heating heat exchanger 500, thereby controlling the flow rate of the heat exchange medium flowing from the external heat circulation system 300 into the heating heat exchanger 500 and realizing the control of the heat exchange speed.

[0130] In one embodiment, the thermal management system of the energy storage power station further includes a pressure regulating device 9 connected to the internal circulation system 100 via a pipeline.

[0131] The pressure regulating device 9 is used to detect the pressure of the heat exchange medium in the pipeline of the internal circulation system 100 in real time. When the pressure is lower than the preset pressure value, the heat exchange medium is added to the pipeline of the internal circulation system 100.

[0132] It is understandable that the heat exchange medium in the internal circulation system 100 pipeline will be consumed naturally. When the heat exchange medium is insufficient, that is, when the pressure is too low, the heat exchange medium needs to be replenished to maintain the pressure in the internal circulation system 100 pipeline.

[0133] In one embodiment, the thermal management system of the energy storage power station further includes a filter 10 disposed in the pipeline of the internal circulation system 100.

[0134] Filter 10 is used to filter impurities in the heat exchange medium in the internal circulation system 100 pipeline.

[0135] It should be noted that the heat exchange medium is filtered through filter 10 to ensure the cleanliness of the heat exchange medium. Filter 10 should be able to perform filtration without interrupting the flow of the heat exchange medium.

[0136] In one embodiment, the thermal management system of the energy storage power station further includes a heater 11 disposed in the pipeline of the internal circulation system 100.

[0137] Heater 11 is used to heat the heat exchange medium in the internal circulation system 100 when the external heat circulation system 300 fails.

[0138] In one embodiment, the thermal management system of the energy storage power station further includes a gate valve 12 disposed in the pipeline of the internal circulation system 100, for controlling the connection or closure of the pipeline of the internal circulation system.

[0139] In one embodiment, the thermal management system of the energy storage power station further includes: a flow transfer table 13 disposed between the external circulation input end of the refrigeration heat exchanger 500 and the output end of the external cooling circulation system 200, for monitoring the flow rate of the heat exchange medium input from the external cooling circulation system 200 to the refrigeration heat exchanger 500.

[0140] In one embodiment, the thermal management system of the energy storage power station further includes a pressure valve 14 disposed in the pipeline of the internal circulation system 100 for monitoring the pressure of the heat exchange medium in the pipeline of the internal circulation system 100.

[0141] Based on the thermal management system of an energy storage power station disclosed in the above embodiments of the present invention, in this solution, the internal circulation system is connected to the external heat circulation system and the external cold circulation system through a heat exchanger. The control components in the internal circulation system control the opening of the corresponding electric butterfly valves and circulation pumps, thereby controlling the internal circulation system to exchange heat with the external heat circulation system or the external cold circulation system, transferring heat from the energy storage battery to the external system or delivering heat to the energy storage battery, avoiding the use of air conditioning or electric heating to maintain the temperature of the energy storage battery, thereby achieving the purpose of improving thermal management efficiency, reducing costs and saving energy consumption.

[0142] A thermal management system for an energy storage power station disclosed in the above embodiments of the present invention, such as Figure 3 The diagram shows a flowchart of a thermal management method for an energy storage power station disclosed in an embodiment of the present invention. This method is applicable to the thermal management system of any energy storage power station disclosed in the above-described embodiment of the present invention, and mainly includes the following steps:

[0143] Step S301: Obtain the temperature of the energy storage battery and the temperature of the battery compartment.

[0144] In step S301, the temperature of the energy storage battery can be collected by the internal circulation system 100 through a temperature sensor, or it can be sent to the internal circulation system by the battery management system.

[0145] Step S302: Based on the temperature of the battery compartment, the heat exchange medium input from the external cooling circulation system 200 is used to exchange heat with the battery compartment to cool it down, or the heat exchange medium input from the external heating circulation system 300 is used to exchange heat with the battery compartment to heat it up.

[0146] In step S302, when the temperature of the battery compartment exceeds the preset temperature range, the heat exchange medium input by the external cooling circulation system 200 is used to exchange heat with the battery compartment to cool it down. When the temperature of the battery compartment is lower than the preset temperature range, the heat exchange medium input by the external heating circulation system 300 is used to exchange heat with the battery compartment to heat it up, so that the temperature of the battery compartment is maintained within the preset temperature range.

[0147] It should be noted that step S302 can be executed in real time.

[0148] Step S303: Determine whether the temperature of the energy storage battery is lower or higher than the preset temperature value.

[0149] When the temperature of the energy storage battery is lower than the preset temperature value, step S304 is executed; when the temperature of the energy storage battery is higher than the preset temperature value, step S306 is executed.

[0150] Step S304: Using the heat exchange medium in the internal circulation system 100, heat exchange is performed between the heat exchange medium in the heating heat exchanger 400 and the heat exchange medium in the external heat circulation system 300.

[0151] In step S304, the heat exchange medium in the external heat circulation system 300 is a high-temperature heat exchange medium that has undergone heat circulation treatment before heat exchange, and becomes a low-temperature heat exchange medium after heat exchange, which is then heat-circulated by the external heat circulation system 300.

[0152] Step S305: The energy storage battery is heated by the heat exchange medium after heat exchange in the heating heat exchanger 400 and the liquid cooling plate 700 in the internal circulation system 100.

[0153] Step S306: Using the heat exchange medium in the internal circulation system 100, heat exchange is performed between the heat exchange medium in the refrigeration heat exchanger 500 and the heat exchange medium in the external cooling circulation system 200.

[0154] In step S306, the heat exchange medium in the external cooling circulation system 200 is a low-temperature heat exchange medium that has undergone cold circulation treatment before heat exchange, and becomes a high-temperature heat exchange medium after heat exchange. The external cooling circulation system 200 performs cold circulation treatment on the high-temperature heat exchange medium.

[0155] Step S307: The energy storage battery is cooled by the heat exchange medium after heat exchange in the cooling heat exchanger 500 and the liquid cooling plate 700 in the internal circulation system 100.

[0156] In one embodiment, the thermal management method of the energy storage power station further includes: using a pressure regulating device 9 connected to the internal circulation system 100 to detect the pressure of the heat exchange medium in the pipeline of the internal circulation system 100 in real time, and when the pressure is lower than the preset pressure value, replenishing the heat exchange medium in the pipeline of the internal circulation system 100.

[0157] In one embodiment, the thermal management method of the energy storage power station further includes: using a filter installed in the internal circulation system 100 pipeline to filter impurities in the heat exchange medium in the internal circulation system 100 pipeline.

[0158] In one embodiment, the thermal management method of the energy storage power station further includes: using a heater installed in the pipeline of the internal circulation system 100 to heat the heat exchange medium in the internal circulation system 100 when the external heat circulation system 300 fails.

[0159] The embodiments of the present invention are method embodiments corresponding to the thermal management system of the energy storage power station disclosed in the above embodiments of the present invention. The explanation of the method part can be referred to the above embodiments of the present invention, and will not be repeated here.

[0160] According to the above-described embodiments of the present invention, a thermal management method for an energy storage power station includes the following steps: When the temperature of the energy storage battery is lower than a preset temperature value, the heat exchange medium in the internal circulation system exchanges heat with the heat exchange medium in the external heat circulation system in a heating heat exchanger; the heat exchange medium after heat exchange in the heating heat exchanger and the liquid cooling plate in the internal circulation system heat the energy storage battery; when the temperature of the energy storage battery is higher than the preset temperature value, the heat exchange medium in the internal circulation system exchanges heat with the heat exchange medium in the external cooling circulation system in a cooling heat exchanger; the heat exchange medium after heat exchange in the cooling heat exchanger and the liquid cooling plate in the internal circulation system cool the energy storage battery; depending on the temperature of the battery compartment, the heat exchange medium output from the external cooling circulation system exchanges heat with the battery compartment to cool the battery compartment, or the heat exchange medium output from the external heat circulation system exchanges heat with the battery compartment to heat the battery compartment. In this solution, a low-energy external cooling circulation system and an external heating circulation system are used to heat or cool the energy storage battery. Combined with an ambient temperature control system, the battery compartment is kept warm, avoiding the use of high-energy-consuming methods such as air conditioning or electric heating to control the temperature of the energy storage battery. This achieves the goal of improving thermal management efficiency, reducing costs and saving energy.

[0161] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and relevant parts can be referred to the descriptions in the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0162] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0163] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thermal management system for an energy storage power station, characterized in that, The system includes: an internal circulation system, an external cooling circulation system, an external heating circulation system, a heating heat exchanger, a cooling heat exchanger, an ambient temperature control system installed in the battery chamber, and a liquid cooling plate in contact with the energy storage battery; the battery chamber contains one or more energy storage battery cabinets, and the energy storage battery is stored in the energy storage battery cabinets. The internal circulation system connects the heating heat exchanger, the cooling heat exchanger, and the liquid cooling plate; The external heat circulation system is connected to the heating heat exchanger and the ambient temperature control system; The external cooling circulation system is connected to the refrigeration heat exchanger and the ambient temperature control system; The pipes in the internal circulation system, the external cold circulation system, and the external heat circulation system each contain flowing heat exchange media. The external cooling circulation system is used to input the heat exchange medium after cooling circulation treatment into the refrigeration heat exchanger and the ambient temperature control system, and to perform the cooling circulation treatment on the heat exchange medium after heat exchange output by the refrigeration heat exchanger and the ambient temperature control system. The external heat circulation system is used to input the heat exchange medium after heat circulation treatment into the heating heat exchanger and the ambient temperature control system, and to perform the heat circulation treatment on the heat exchange medium after heat exchange output by the cooling heat exchanger and the ambient temperature control system. The ambient temperature control system is used to acquire and, based on the temperature of the battery compartment, exchange heat with the battery compartment using the heat exchange medium input from the external cooling circulation system to cool the battery compartment, or to exchange heat with the battery compartment using the heat exchange medium input from the external heating circulation system to heat the battery compartment. The internal circulation system is used to acquire the temperature of the energy storage battery. When the temperature of the energy storage battery is lower than a preset temperature value, the heat exchange medium in the internal circulation system exchanges heat with the heat exchange medium in the external heat circulation system in the heating heat exchanger, and the heat exchange medium and the liquid cooling plate after heat exchange are used to heat the energy storage battery. When the temperature of the energy storage battery is higher than the preset temperature value, the heat exchange medium in the internal circulation system exchanges heat with the heat exchange medium in the external cooling circulation system in the cooling heat exchanger, and the heat exchange medium and the liquid cooling plate after heat exchange are used to cool the energy storage battery.

2. The system according to claim 1, characterized in that, The internal circulation system includes: a first electric butterfly valve, a second electric butterfly valve, a control component, a gate valve, a first internal circulation pump, and a second internal circulation pump; One end of the first electric butterfly valve is connected to the internal circulation output end of the heating heat exchanger via the first internal circulation pump, and one end of the second electric butterfly valve is connected to the internal circulation output end of the refrigeration heat exchanger via the second internal circulation pump. The other ends of the first electric butterfly valve and the other ends of the second electric butterfly valve are connected to form a first common end. One end of the liquid cooling plate is connected to the first common end, and the other end of the liquid cooling plate is connected to the second common end. The second common end is formed by connecting the internal circulation input end of the heating heat exchanger and the internal circulation input end of the refrigeration heat exchanger. The control components are respectively communicatively connected to the first electric butterfly valve, the second electric butterfly valve, the first internal circulation pump, and the second internal circulation pump; One end of the gate valve is connected to the first common terminal, and the other end is connected to the second common terminal; The control component is used to acquire the temperature of the energy storage battery; when the temperature of the energy storage battery is lower than a preset temperature value, it controls the first electric butterfly valve and the first internal circulation pump to open, using the first internal circulation pump to provide power to deliver the heat exchange medium to the heating heat exchanger, where it exchanges heat with the heat exchange medium in the external heat circulation system, and uses the heat exchange medium after heat exchange and the liquid cooling plate to heat the energy storage battery; when the temperature of the energy storage battery is higher than the preset temperature value, it controls the second electric butterfly valve and the second internal circulation pump to open, using the second internal circulation pump to provide power to deliver the heat exchange medium to the cooling heat exchanger, where it exchanges heat with the heat exchange medium in the external cooling circulation system, and uses the heat exchange medium after heat exchange and the liquid cooling plate to cool the energy storage battery; The gate valve is used to control the flow rate of the heat exchange medium after heat exchange into the liquid cooling plate.

3. The system according to claim 1, characterized in that, The external heat circulation system includes: a heating network, a local heat exchange station, and a first external circulation pump; The heating pipeline network is connected to the local heat exchange station; The output end of the local heat exchange station is connected to the external circulation input end of the heating heat exchanger via the first external circulation pump. The input end of the local heat exchange station is connected to the external circulation output end of the heating heat exchanger; The heating network is used to heat the heat exchange medium to obtain a high-temperature heat exchange medium and transport it to the local heat exchange station. The local heat exchange station is used to adjust the temperature, pressure and flow rate of the high-temperature heat exchange medium to obtain the heat exchange medium that meets the requirements, and to transport it to the heating heat exchanger to exchange heat with the heat exchange medium in the internal circulation system to obtain a low-temperature heat exchange medium and transport it back to the heating network. The first external circulation pump is used to provide power for conveying the low-temperature heat exchange medium and the high-temperature heat exchange medium.

4. The system according to claim 1, characterized in that, The external cooling circulation system includes: a water-cooled unit, an air-cooled unit, and a second external circulation pump; The water-cooled unit is connected to the air-cooled unit; The output end of the water-cooled unit is connected to the external circulation input end of the refrigeration heat exchanger via the second external circulation pump. The input end of the water-cooled unit is connected to the external circulation output end of the refrigeration heat exchanger; The water-cooled unit is used to dissipate heat from the heat exchange medium using a compressor when the outside temperature is higher than the preset temperature, so as to obtain a low-temperature heat exchange medium that is delivered to the refrigeration heat exchanger to exchange heat with the heat exchange medium in the internal circulation system, thereby obtaining a high-temperature heat exchange medium and performing the same heat dissipation treatment; when the outside temperature is lower than the preset temperature, the high-temperature heat exchange medium is delivered to the air-cooled unit. The air-cooled unit uses air to dissipate heat from the high-temperature heat exchange medium, and then returns the low-temperature heat exchange medium to the water-cooled unit. The second external circulation pump is used to provide power for conveying the low-temperature heat exchange medium and the high-temperature heat exchange medium.

5. The system according to claim 1, characterized in that, The system also includes a pressure regulating device connected to the internal circulation system via a pipeline; The pressure regulating device is used to detect the pressure of the heat exchange medium in the internal circulation system in real time, and when the pressure is lower than the preset pressure value, it replenishes the heat exchange medium to the internal circulation system.

6. The system according to claim 1, characterized in that, The system also includes: a filter disposed in the pipeline of the internal circulation system; The filter is used to filter impurities in the heat exchange medium of the internal circulation system.

7. The system according to claim 1, characterized in that, The system further includes: a heater disposed in the internal circulation system pipeline; The heater is used to heat the heat exchange medium in the internal circulation system when the external heat circulation system fails.

8. The system according to any one of claims 1 to 7, characterized in that, The heat exchange medium in the external cooling circulation system includes a mixture of water and ethylene glycol.

9. The system according to any one of claims 1 to 7, characterized in that, The heat exchange medium in the external heat circulation system and the internal circulation system includes water.

10. A thermal management method for an energy storage power station, characterized in that, The method, applicable to the thermal management system of any one of claims 1 to 9, comprises: The temperature of the energy storage battery and the temperature of the battery compartment are obtained; Depending on the temperature of the battery compartment, the heat exchange medium output by the external cooling circulation system is used to exchange heat with the battery compartment to cool it down, or the heat exchange medium output by the external heating circulation system is used to exchange heat with the battery compartment to heat it up. When the temperature of the energy storage battery is lower than the preset temperature value, the heat exchange medium in the internal circulation system is used to exchange heat with the heat exchange medium in the external heat circulation system in the heating heat exchanger. The energy storage battery is heated by the heat exchange medium after heat exchange in the heating heat exchanger and the liquid cooling plate in the internal circulation system. When the temperature of the energy storage battery is higher than the preset temperature value, the heat exchange medium in the internal circulation system is used to exchange heat with the heat exchange medium in the external cooling circulation system in the refrigeration heat exchanger. The energy storage battery is cooled by the heat exchange medium after heat exchange in the refrigeration heat exchanger and the liquid cooling plate in the internal circulation system.

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