Energy storage liquid cooling system

Abstract

The invention discloses an energy storage liquid cooling system which comprises a heat exchanger. The first liquid conveying component communicates with the cold receiving end of the heat exchanger to form a first liquid cooling flow path; the refrigeration module is communicated with the cold supply end of the heat exchanger to form a refrigeration loop; an air cooling component; the second liquid conveying component is communicated with the air cooling component to form a second liquid cooling flow path; a liquid outlet of the cooled end of the heat exchanger selectively communicates with a liquid inlet of the second liquid conveying component through a first branch. A liquid inlet of the first liquid conveying component selectively communicates with a liquid outlet of the air cooling component through a second branch. When the environment temperature is high and the heat exchange efficiency of the air cooling component is low, the first liquid cooling flow path and the second liquid cooling flow path are connected in a bridging mode through the first branch and the second branch, a low-temperature secondary refrigerant in the first liquid cooling flow path can be partially led into the second liquid cooling flow path through the first branch, cooling capacity compensation of the PCS is achieved, insufficient cooling capacity of the PCS is made up, and normal operation of the PCS is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and particularly to an energy storage liquid cooling system. Background Art

[0002] Large-scale energy storage systems usually use containers as carriers, in which a battery system, an energy management system, a battery management system (BMS), a power converter system (PCS), a cooling system, a fire protection system, and lighting and monitoring systems are assembled. With the continuous growth of the energy storage installed capacity, energy storage battery cells are developing towards large capacity, low cost, and long life. Large-capacity battery cells have a high energy density, posing challenges to energy storage temperature control and thermal management.

[0003] Liquid cooling temperature control technology is widely used in container energy storage systems. It removes the heat generated by the energy storage system through liquid circulation, thereby maintaining the stability of the internal temperature of the system. Currently, the PCS liquid cooling circulation system mainly uses natural air cooling sources. When the external environmental temperature is relatively high, there will be a shortage of cooling capacity, resulting in an increase in the internal temperature of the PCS and causing the PCS to malfunction. Summary of the Invention

[0004] In view of the problems pointed out in the background art, the present invention provides an energy storage liquid cooling system to solve the problem in the prior art that when the PCS liquid cooling circulation system is in a high external environmental temperature, there will be a shortage of cooling capacity, resulting in an increase in the internal temperature of the PCS and causing the PCS to malfunction.

[0005] To achieve the above-mentioned invention purpose, the present invention is implemented by adopting the following technical solutions: The present invention provides an energy storage liquid cooling system, including: A heat exchanger; A first liquid delivery component, which is connected to the cold end of the heat exchanger to form a first liquid cooling flow path for dissipating heat from the energy storage battery; A refrigeration module, which is connected to the cold supply end of the heat exchanger to form a refrigeration circuit; An air cooling component; A second liquid delivery component, which is connected to the air cooling component to form a second liquid cooling flow path for dissipating heat from the PCS; Wherein, the liquid outlet of the cold end of the heat exchanger is selectively connected to the liquid inlet of the second liquid delivery component through a first branch; the liquid inlet of the first liquid delivery component is selectively connected to the liquid outlet of the air cooling component through a second branch.

[0006] The above embodiments have the following advantages or beneficial effects: By providing a heat exchanger, a first liquid delivery component, a refrigeration module, an air-cooling component, and a second liquid delivery component, the refrigeration module indirectly refrigerates the coolant in the first liquid cooling flow path through heat exchange of the heat exchanger; the liquid outlet of the cold-receiving end of the heat exchanger is selectively communicated with the liquid inlet of the second liquid delivery component through a first branch, and the liquid inlet of the first liquid delivery component is selectively communicated with the liquid outlet of the air-cooling component through a second branch. When the environmental temperature is high and the heat exchange efficiency of the air-cooling component is low, the first branch and the second branch connect the first liquid cooling flow path and the second liquid cooling flow path in a bridging manner. The low-temperature coolant in the first liquid cooling flow path can be partially introduced into the second liquid cooling flow path through the first branch, realizing cold quantity compensation for the PCS, making up for the insufficient cold quantity of the PCS, and being beneficial to ensuring the normal operation of the PCS.

[0007] In some embodiments of the present application, the energy storage liquid cooling system further includes: A first proportional regulating valve, which is arranged on the first branch and is used for regulating the flow rate of the first branch; A second proportional regulating valve, which is arranged on the second branch and is used for regulating the flow rate of the second branch; Wherein, the first proportional regulating valve and the second proportional regulating valve are configured to be synchronously regulated.

[0008] The above embodiments have the following advantages or beneficial effects: By providing a first proportional regulating valve on the first branch and a second proportional regulating valve on the second branch, the first proportional regulating valve and the second proportional regulating valve can be synchronously regulated to realize refined distribution control of cold quantity.

[0009] In some embodiments of the present application, the energy storage liquid cooling system further includes: A bypass branch, one end of which is communicated with the liquid outlet of the first liquid delivery component, and the other end of which is connected to the liquid outlet of the cold-receiving end of the heat exchanger; A first valve, which is arranged on the bypass branch and is used for opening or closing the bypass branch.

[0010] The above embodiments have the following advantages or beneficial effects: By providing a bypass branch and a first valve, when the flow rate in the first liquid cooling flow path is too large, the flow resistance of the coolant flowing into the cold-receiving end of the heat exchanger can be appropriately reduced by opening the bypass branch, so as to maintain the stability of the liquid supply pressure of the energy storage battery.

[0011] In some embodiments of the present application, the refrigeration module includes: A compression refrigeration unit, which includes a compressor, a condenser, and an electronic expansion valve. The compressor, the condenser, the electronic expansion valve, and the coolant supply end of the heat exchanger are sequentially connected through pipelines to form a compression refrigeration circuit.

[0012] The above embodiments have the following advantages or beneficial effects: The compression refrigeration unit includes a compressor, a condenser, and an electronic expansion valve. When the ambient temperature is in a high-temperature working condition, the compressor can quickly achieve stable and efficient cooling of the first liquid cooling flow path by circulating the refrigerant.

[0013] In some embodiments of the present application, the refrigeration module further includes: A fluorine pump refrigeration unit, which includes a liquid storage tank, a fluorine pump, and the electronic expansion valve. The liquid storage tank, the fluorine pump, the electronic expansion valve, and the cooling supply end of the heat exchanger are sequentially connected in communication through pipelines.

[0014] The above embodiments have the following advantages or beneficial effects: By setting up a fluorine pump refrigeration unit, which includes a liquid storage tank, a fluorine pump, and an electronic expansion valve, when the ambient temperature is in a low-temperature working condition, turning on the fluorine pump, the power of the fluorine pump is much smaller than that of the compressor, which is beneficial to reducing energy consumption and improving the energy utilization rate of the energy storage battery liquid cooling system.

[0015] In some embodiments of the present application, the energy storage liquid cooling system further includes: A first pipeline, which is connected in parallel at both ends of the compressor; A first one-way valve, which is arranged on the first pipeline, its input end is connected to the input end of the compressor, and its output end is connected to the output end of the compressor.

[0016] The above embodiments have the following advantages or beneficial effects: The first pipeline is connected in parallel at both ends of the compressor. When the ambient temperature is in a low-temperature working condition and the fluorine pump needs to be started, the first one-way valve is opened and the compressor is closed, and the refrigerant will not flow through the compressor; when the ambient temperature is in a high-temperature working condition and the compression refrigeration circuit needs to be started, the first one-way valve is closed and the compressor is opened, so that the refrigerant will flow through the compressor.

[0017] In some embodiments of the present application, the energy storage liquid cooling system includes: A second pipeline, which is connected in parallel at both ends of the fluorine pump and the liquid storage tank; A second one-way valve, which is arranged on the second pipeline, its input end is communicated with the liquid inlet of the liquid storage tank, and its output end is connected to the liquid outlet of the fluorine pump; A first solenoid valve, which is arranged on the pipeline connecting the liquid storage tank and the condenser; A second solenoid valve, which is arranged on the pipeline connecting the liquid storage tank and the fluorine pump.

[0018] The above embodiments have the following advantages or beneficial effects: The compression refrigeration circuit includes a second pipeline, a second one-way valve, a first solenoid valve, and a second solenoid valve. The second pipeline is connected in parallel at both ends of the fluorine pump and the liquid storage tank. When the ambient temperature is relatively low, the fluorine pump is started, the first solenoid valve, the second solenoid valve, and the first one-way valve are opened, and the second one-way valve is closed. In this way, the refrigerant flows through the liquid storage tank and the fluorine pump, which can save energy consumption. When the ambient temperature is relatively high and the PCS cooling capacity is insufficient, the compressor is started, the first solenoid valve, the second solenoid valve, and the first one-way valve are closed, and the second one-way valve is opened. The refrigerant does not pass through the liquid storage tank and the fluorine pump, and compression refrigeration is used to make up for the insufficient PCS cooling capacity.

[0019] In some embodiments of the present application, the energy storage liquid cooling system further includes: A second pipeline, which is connected in parallel at both ends of the fluorine pump; A second one-way valve, which is arranged on the second pipeline, and its input end is connected to the liquid inlet of the fluorine pump, and its output end is connected to the liquid outlet of the fluorine pump; A first solenoid valve, which is arranged on the pipeline connecting the liquid storage tank and the condenser; A second solenoid valve, which is arranged on the pipeline connecting the liquid storage tank and the fluorine pump; A third solenoid valve, which is arranged on the pipeline connected in parallel at both ends of the first solenoid valve, the liquid storage tank, and the second solenoid valve.

[0020] The above embodiments have the following advantages or beneficial effects: By setting the second pipeline, the second one-way valve, the first solenoid valve, the second solenoid valve, and the third solenoid valve, the second pipeline is connected in parallel at both ends of the fluorine pump. When the ambient temperature is relatively low, the fluorine pump is started, the first solenoid valve, the second solenoid valve, and the first one-way valve are opened, and the third solenoid valve and the second one-way valve are closed. In this way, the refrigerant flows through the liquid storage tank and the fluorine pump. When the ambient temperature is relatively high and the PCS cooling capacity is insufficient, the compressor is started, the second one-way valve and the third solenoid valve are opened, and the first solenoid valve, the second solenoid valve, and the first one-way valve are closed. The refrigerant does not flow through the fluorine pump and the liquid storage tank, and compression refrigeration is used to make up for the insufficient PCS cooling capacity. The refrigerant flowing out of the condenser flows through the second pipeline.

[0021] In some embodiments of the present application, In the first working condition, part of the coolant in the first liquid cooling flow path flows into the second liquid cooling flow path through the first branch; part of the coolant in the second liquid cooling flow path synchronously flows into the first liquid cooling flow path through the second branch. The refrigeration module and the air cooling component are started. The refrigeration module dissipates heat from the energy storage battery and the PCS, and the air cooling component dissipates heat from the PCS; In the second working condition, the liquid outlet of the cold end of the heat exchanger is disconnected from the liquid inlet of the second liquid delivery component; the liquid inlet of the first liquid delivery component is disconnected from the liquid outlet of the air-cooling component, the refrigeration module and the air-cooling component are started, the refrigeration module dissipates heat from the energy storage battery, and the air-cooling component dissipates heat from the PCS; Among them, the ambient temperature in the first working condition is higher than that in the second working condition.

[0022] The above embodiments have the following advantages or beneficial effects: In the first working condition, the air-cooling component dissipates heat from the PCS, and while the refrigeration module dissipates heat from the energy storage battery, it also compensates the cold quantity of the PCS, making up for the insufficient cold quantity of the PCS caused by the low heat exchange efficiency of the air-cooling component at a relatively high ambient temperature; in the second working condition, the PCS uses the air-cooling component as the cooling source, which can make full use of the natural cold source of air to meet the best working temperature of the PCS, which is beneficial to improving the energy utilization rate of the energy storage liquid cooling system.

[0023] In some embodiments of the present application, the energy storage liquid cooling system further includes: An expansion tank; A first connecting pipe, one end of which is communicated with the first liquid cooling flow path, and the other end of which is communicated with the output end of the expansion tank; A second valve, which is arranged on the first connecting pipe and is used to open or close the first connecting pipe; A second connecting pipe, one end of which is communicated with the second liquid cooling flow path, and the other end of which is communicated with the output end of the expansion tank; A third valve, which is arranged on the second connecting pipe and is used to open or close the second connecting pipe.

[0024] The above embodiments have the following advantages or beneficial effects: By connecting the expansion tank and the first liquid cooling flow path through the first connecting pipe, and connecting the expansion tank and the second liquid cooling flow path through the second connecting pipe, the first liquid cooling flow path and the second liquid cooling flow path share the expansion tank, which is beneficial to maintaining the pressure stability of the two liquid cooling flow paths. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of an embodiment of the energy storage liquid cooling system provided by the present invention; Figure 2Schematic diagram of the flow directions of the coolant and refrigerant of the energy storage liquid cooling system provided by the present invention under the first working condition; Figure 3 Schematic diagram of the flow directions of the coolant and refrigerant of the energy storage liquid cooling system provided by the present invention under the first sub - working condition 2; Figure 4 Schematic diagram of the flow directions of the coolant and refrigerant of the energy storage liquid cooling system provided by the present invention under the second sub - working condition 2; Figure 5 Schematic diagram of the flow directions of the coolant and refrigerant of an embodiment of the energy storage liquid cooling system provided by the present invention in the heating mode; Figure 6 Schematic diagram of the structure of an embodiment of the energy storage liquid cooling system provided by the present invention in the liquid replenishment state; Figure 7 Schematic diagram of the structure of another embodiment of the energy storage liquid cooling system provided by the present invention; Figure 8 Schematic diagram of the structure of another embodiment of the energy storage liquid cooling system provided by the present invention; Figure 9 Schematic diagram of the structure of another embodiment of the energy storage liquid cooling system provided by the present invention; Figure 10 Schematic diagram of the structure of another embodiment of the energy storage liquid cooling system provided by the present invention.

[0027] Reference numerals: 1. Energy storage battery; 2. PCS; 3. Heat exchanger; 4. First liquid delivery component; 5. Refrigeration module; 51. Compressor; 52. Condenser; 53. Electronic expansion valve; 54. Liquid receiver; 55. Fluorine pump; 56. First solenoid valve; 57. Second solenoid valve; 58. Third solenoid valve; 6. Air cooling component; 7. Second liquid delivery component; 8. First branch; 81. First proportional regulating valve; 9. Second branch; 91. Second proportional regulating valve; 10. Bypass branch; 101. First valve; 20. First pipeline; 201. First check valve; 30. Second pipeline; 301. Second check valve; 40. Expansion tank; 401. First connecting pipeline; 4011. Second valve; 402. Second connecting pipeline; 4021. Third valve; 90. Battery liquid outlet temperature sensor; 92. PCS liquid outlet temperature sensor; 93. PCS liquid inlet temperature sensor; 94. Battery liquid outlet pressure sensor; 95. Battery liquid inlet pressure sensor; 96. PCS liquid outlet pressure sensor; 97. PCS liquid inlet pressure sensor; 98. Battery liquid inlet temperature sensor; 60. First filter; 61. Second filter; 70. Battery water heater; 71. PCS water heater; 80. Liquid replenishment tank. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0029] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0030] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0031] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0032] In the present invention, unless otherwise clearly specified or limited, the first feature being “on” or “under” the second feature may include direct contact between the first and second features, or may also include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being “above”, “over” and “on top of” the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being “under”, “beneath” and “underneath” the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0033] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described hereinafter. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0034] A complete electrochemical energy storage system mainly consists of a battery pack, a battery management system (BMS), an energy management system (EMS), a power conversion system (PCS) and other electrical devices.

[0035] The battery management system (BMS) is mainly responsible for battery monitoring, evaluation, protection and equalization, etc. It is the brain of the energy storage system. As a link connecting the battery cells and the energy storage system / energy storage power station, it can realize intelligent management and maintenance of each battery unit, mainly responsible for battery health detection, evaluation and protection, ensuring that the battery cells operate in a safer and more comfortable environment, realizing dynamic maintenance of battery consistency and precise control of the ambient temperature.

[0036] The power conversion system PCS, also known as a bidirectional energy storage inverter, is the core component for realizing bidirectional power flow between the energy storage system and the power grid, and is used to control the charging and discharging processes of the battery and perform AC-DC conversion.

[0037] The energy management system (EMS) is responsible for monitoring and controlling the energy flow within the battery storage system and coordinating the work of the BMS, PCS and other components.

[0038] A battery cluster usually consists of parts such as battery modules, battery packs and a battery management system. A battery module is the basic unit of the battery cluster. It contains multiple battery cells and provides connection and protection functions for the battery cells. A battery pack is formed by connecting multiple battery modules in series or in parallel, and it provides the overall voltage and capacity of the battery cluster.

[0039] An embodiment of the present disclosure provides a energy storage liquid cooling system, which combines Figures 1 to 10 As shown, the energy storage liquid cooling system includes an energy storage battery 1, a PCS 2, a heat exchanger 3, a first liquid delivery component 4, a refrigeration module 5, an air cooling component 6, a second liquid delivery component 7, and a control module.

[0040] A first liquid cooling channel is formed inside the energy storage battery 1, and a second liquid cooling channel is formed inside the PCS 2.

[0041] The first liquid delivery component 4 is connected to the cold end of the heat exchanger 3 to form a first liquid cooling flow path. The two ends of the first liquid cooling flow path and the two ends of the first liquid cooling channel are respectively connected through a first inlet chuck and a first outlet chuck. The first liquid cooling flow path and the first liquid cooling channel form a closed loop, and a coolant is passed through the closed loop to cool and dissipate heat from the energy storage battery 1.

[0042] The refrigeration module 5 is connected to the cold supply end of the heat exchanger 3 to form a refrigeration loop. A refrigerant is passed through the refrigeration loop. The refrigeration module 5 is used for refrigeration, and the refrigeration loop cools the first liquid cooling flow path through the heat exchanger 3.

[0043] The second liquid delivery component 7 is connected to the air cooling component 6 to form a second liquid cooling flow path. The two ends of the second liquid cooling flow path and the two ends of the second liquid cooling channel are respectively connected through a second inlet chuck and a second outlet chuck. The second liquid cooling flow path and the second liquid cooling channel form a closed loop, and a coolant is passed through the closed loop to cool and dissipate heat from the PCS 2.

[0044] Wherein, the outlet of the cold end of the heat exchanger 3 is selectively connected to the inlet of the second liquid delivery component 7 through a first branch 8; the inlet of the first liquid delivery component 4 is selectively connected to the outlet of the air cooling component 6 through a second branch 9.

[0045] Specifically, by setting the heat exchanger 3, the first liquid delivery component 4, the refrigeration module 5, the air cooling component 6, and the second liquid delivery component 7, the refrigeration module 5 indirectly refrigerates the coolant in the first liquid cooling flow path after heat exchange through the heat exchanger 3; the outlet of the cold end of the heat exchanger 3 is selectively connected to the inlet of the second liquid delivery component 7 through the first branch 8, and the inlet of the first liquid delivery component 4 is selectively connected to the outlet of the air cooling component 6 through the second branch 9. When the environmental temperature is high and the heat exchange efficiency of the air cooling component is low, the first branch 8 and the second branch 9 connect the first liquid cooling flow path and the second liquid cooling flow path in a bridging manner. The low-temperature coolant in the first liquid cooling flow path can be partially introduced into the second liquid cooling flow path through the first branch 8 and the second branch 9 to realize the cold quantity compensation for the PCS 2, which can make up for the insufficient cold quantity of the PCS 2 and is beneficial to ensuring the normal operation of the PCS 2.

[0046] Specifically, during the cold quantity compensation process, by connecting the first branch 8 to the liquid inlet of the second liquid infusion component 7, since the pressure at the liquid inlet of the second liquid infusion component 7 is relatively low, it is convenient to introduce part of the low-temperature coolant in the first liquid cooling flow path into the second liquid cooling flow path; by connecting the second branch 9 to the liquid inlet of the first liquid infusion component 4, the pressure at the liquid inlet of the first liquid infusion component 4 is relatively low, which is convenient for part of the coolant in the second liquid cooling flow path to flow back to the first liquid cooling flow path.

[0047] Specifically, the first liquid infusion component 4 and the second liquid infusion component 7 include but are not limited to water pumps.

[0048] Specifically, the air-cooling component 6 includes a dry cooler or an air cooler.

[0049] Specifically, the heat exchanger 3 includes a plate heat exchanger 3, a spiral plate heat exchanger 3, a plate fin heat exchanger 3, etc.

[0050] In some embodiments of the present application, the energy storage liquid cooling system further includes a first proportional regulating valve 81 and a second proportional regulating valve 91.

[0051] The first proportional regulating valve 81 is arranged on the first branch 8 for regulating the flow rate of the first branch 8; the second proportional regulating valve 91 is arranged on the second branch 9 for regulating the flow rate of the second branch 9, wherein the first proportional regulating valve 81 and the second proportional regulating valve 91 are adjusted synchronously.

[0052] Specifically, by arranging the first proportional regulating valve 81 on the first branch 8, the first proportional regulating valve 81 can adjust the opening degree of the first branch 8, and by arranging the second proportional regulating valve 91 on the second branch 9, the second proportional regulating valve 91 can adjust the opening degree of the second branch 9. The first proportional regulating valve 81 and the second proportional regulating valve 91 can be adjusted synchronously, that is, opened and closed simultaneously, to achieve refined distribution control of the coolant in the first liquid cooling flow path.

[0053] Specifically, the first proportional regulating valve 81 and the second proportional regulating valve 91 include but are not limited to electric proportional regulating valves, pneumatic proportional regulating valves, and electromagnetic proportional regulating valves.

[0054] In some embodiments of the present application, a first filter 60 is arranged on the first liquid cooling flow path, and the first filter 60 is located between the first liquid infusion component 4 and the heat exchanger 3.

[0055] A second filter 61 is arranged on the second liquid cooling flow path, and the second filter 61 is located on the side of the second liquid infusion component 7 away from the air-cooling component 6.

[0056] The first filter 60 and the second filter 61 can intercept impurities such as particulate matter and metal chips in the coolant, prevent them from entering the liquid cooling flow path, and avoid blocking the pipeline or damaging key components such as pumps and valves.

[0057] In some embodiments of the present application, the energy storage liquid cooling system further includes a bypass branch 10 and a first valve 101.

[0058] One end of the bypass branch 10 is communicated with the liquid outlet of the first liquid delivery component 4, and the other end of the bypass branch 10 is connected to the liquid outlet of the cold receiving end of the heat exchanger 3.

[0059] The first valve 101 is arranged on the bypass branch 10 and is used to open or close the bypass branch 10.

[0060] Specifically, by providing the bypass branch 10 and the first valve 101, when the flow rate in the first liquid cooling flow path is too large, the resistance of the refrigerant flowing through the first filter 60 and the heat exchanger 3 will be relatively large, which will cause the pressure of the coolant flowing out of the heat exchanger 3 to be too low. By opening the bypass branch 10, the flow rate of the coolant flowing into the filter and the cold receiving end of the heat exchanger 3 can be appropriately reduced, avoiding excessive pressure loss of the coolant and being beneficial to maintaining the stability of the liquid supply pressure of the energy storage battery 1.

[0061] In some embodiments of the present application, the refrigeration module 5 includes a compression refrigeration unit.

[0062] The compression refrigeration unit includes a compressor 51, a condenser 52 and an electronic expansion valve 53. The compressor 51, the condenser 52, the electronic expansion valve 53 and the cold supply end of the heat exchanger 3 are sequentially connected through pipelines to form a compression refrigeration circuit.

[0063] Specifically, the compression refrigeration unit includes a compressor 51, a condenser 52 and an electronic expansion valve 53. By circulating the refrigerant through the compressor 51, the temperature of the first liquid cooling flow path can be quickly and stably reduced with high efficiency.

[0064] In some embodiments of the present application, the refrigeration module 5 further includes a fluorine pump refrigeration unit.

[0065] The fluorine pump refrigeration unit includes a liquid storage device 54, a fluorine pump 55 and an electronic expansion valve 53. The liquid storage device 54, the fluorine pump 55, the electronic expansion valve 53 and the cold supply end of the heat exchanger 3 are sequentially connected through pipelines to form a fluorine pump refrigeration circuit.

[0066] Specifically, by providing the fluorine pump refrigeration unit, which includes a liquid storage device 54, a fluorine pump 55 and an electronic expansion valve 53, generally the operating power of the fluorine pump 55 is within 300W, while the operating power of the compressor 51 is above 5KW. The power of the fluorine pump 55 is much smaller than that of the compressor 51. Turning on the fluorine pump 55 and turning off the compressor 51 is beneficial to reducing energy consumption and lowering the operating cost of the energy storage liquid cooling system.

[0067] In some embodiments of the present application, Under the first working condition, the liquid outlet of the cold end of the heat exchanger 3 is communicated with the liquid inlet of the second liquid delivery component 7 through the first branch 8, and part of the coolant in the first liquid cooling flow path flows into the second liquid cooling flow path through the first branch 8; the liquid inlet of the first liquid delivery component 4 is communicated with the liquid outlet of the air cooling component 6 through the second branch 9, and part of the coolant in the second liquid cooling flow path synchronously flows into the first liquid cooling flow path through the second branch 9. The refrigeration module 5 and the air cooling component 6 are started, the refrigeration module 5 cools and dissipates heat from the energy storage battery 1 and the PCS 2, and the air cooling component 6 cools and dissipates heat from the PCS 2.

[0068] Under the second working condition, the connection between the liquid outlet of the cold end of the heat exchanger 3 and the liquid inlet of the second liquid delivery component 7 is disconnected; the connection between the liquid inlet of the first liquid delivery component 4 and the liquid outlet of the air cooling component 6 is disconnected. The refrigeration module 5 and the air cooling component 6 are started, the refrigeration module 5 dissipates heat from the energy storage battery 1, and the air cooling component 6 dissipates heat from the PCS 2; Among them, the ambient temperature under the first working condition is higher than that under the second working condition. Specifically, under the first working condition, while the air cooling component 6 dissipates heat from the PCS 2 and the refrigeration module 5 dissipates heat from the energy storage battery 1, it also compensates the cold quantity of the PCS 2 to make up for the insufficient cold quantity of the PCS 2 caused by the low heat exchange efficiency of the air cooling component 6 under a higher ambient temperature; under the second working condition, the PCS 2 uses the air cooling component 6 as the cooling source, which can make full use of the natural cold source of air to meet the best working temperature of the PCS 2, which is beneficial to improving the energy utilization rate of the energy storage liquid cooling system.

[0069] In some embodiments of the present application, the second working condition includes a second sub-working condition one and a second sub-working condition two, where the ambient temperature under the second sub-working condition one is higher than that under the second sub-working condition two.

[0070] Under the second sub-working condition one, the connection between the liquid outlet of the cold end of the heat exchanger 3 and the liquid inlet of the second liquid delivery component 7 is disconnected; the connection between the liquid inlet of the first liquid delivery component 4 and the liquid outlet of the air cooling component 6 is disconnected. The compression refrigeration unit and the air cooling component 6 are started, and the compression refrigeration circuit formed by the compressor 51, the condenser 52, the electronic expansion valve 53 and the cooling end of the heat exchanger 3 cools and dissipates heat from the energy storage battery 1, and the air cooling component 6 cools and dissipates heat from the PCS 2.

[0071] Under the second sub-working condition two, the connection between the liquid outlet of the cold end of the heat exchanger 3 and the liquid inlet of the second liquid delivery component 7 is disconnected; the connection between the liquid inlet of the first liquid delivery component 4 and the liquid outlet of the air cooling component 6 is disconnected. The fluorine pump refrigeration unit and the air cooling component 6 are started, and the fluorine pump refrigeration circuit formed by the liquid storage device 54, the fluorine pump 55, the electronic expansion valve 53 and the cooling end of the heat exchanger 52 cools and dissipates heat from the energy storage battery 1, and the air cooling component 6 cools and dissipates heat from the PCS 2.

[0072] In some embodiments of the present application, the energy storage liquid cooling system further includes a first pipeline 20 and a first one-way valve 201.

[0073] The first pipeline 20 is connected to the fluorine pump refrigeration circuit, and the first pipeline 20 is connected in parallel at both ends of the compressor 51.

[0074] The first one-way valve 201 is arranged on the first pipeline 20. The input end of the first one-way valve 201 is connected to the input end of the compressor 51, and the output end of the first one-way valve 201 is connected to the output end of the compressor 51.

[0075] Specifically, the first pipeline 20 is connected in parallel at both ends of the compressor 51. When the ambient temperature is in the low-temperature working condition and the fluorine pump refrigeration circuit needs to be started, the first one-way valve 201 is opened and the compressor 51 is closed, and the refrigerant does not flow through the compressor 51; when the ambient temperature is in the high-temperature working condition and the compression refrigeration circuit needs to be started, the first one-way valve 201 is closed and the compressor 51 is opened, so that the refrigerant will flow through the compressor 51.

[0076] In some embodiments of the present application, the energy storage liquid cooling system includes a second pipeline 30, a second one-way valve 301, a first solenoid valve 56 and a second solenoid valve 57.

[0077] Combined with Figures 1 to 6 As shown, the second pipeline 30 is connected in parallel at both ends of the fluorine pump 55 and the liquid storage tank 54. The second one-way valve 301 is arranged on the second pipeline 30. The input end of the second one-way valve 301 is communicated with the liquid inlet of the liquid storage tank 54, and the output end of the second one-way valve 301 is communicated with the liquid outlet of the fluorine pump 55; The first solenoid valve 56 is arranged on the fluorine pump refrigeration circuit and is located on the pipeline connecting the liquid storage tank 54 and the condenser 52.

[0078] The second solenoid valve 57 is arranged on the fluorine pump refrigeration circuit and is located on the pipeline connecting the liquid storage tank 54 and the fluorine pump 55.

[0079] Specifically, the second pipeline 30 is connected to the compression refrigeration circuit. The second pipeline 30 is connected in parallel at both ends of the fluorine pump 55 and the liquid storage tank 54. When the ambient temperature is in the low-temperature working condition and the ambient temperature is relatively low, when starting the fluorine pump refrigeration circuit, the first solenoid valve 56, the second solenoid valve 57 and the first one-way valve are opened, and the second one-way valve 301 is closed, so that the refrigerant flows through the liquid storage tank 54 and the fluorine pump 55, and the fluorine pump 55 is used for refrigeration. The power of the fluorine pump 55 is small, and energy consumption can be saved; when the ambient temperature is in the high-temperature working condition, that is, when the ambient temperature is relatively high, when starting the compression refrigeration circuit, the first solenoid valve 56, the second solenoid valve 57 and the first one-way valve are closed, and the second one-way valve 301 is opened. The refrigerant does not pass through the liquid storage tank 54 and the fluorine pump 55, and compression refrigeration is used to make up for the insufficient cold quantity of the PCS.

[0080] In other embodiments of the present application, the energy storage liquid cooling system further includes a second pipeline 30, a second one-way valve 301, a first solenoid valve 56 and a second solenoid valve 57.

[0081] The second pipeline 30 is connected to the compression refrigeration circuit, and in combination with Figure 7 and Figure 8 as shown, the second pipeline 30 is connected in parallel at both ends of the fluorine pump 55.

[0082] A second one-way valve 301 is arranged on the second pipeline 30. The input end of the second one-way valve 301 is communicated with the liquid inlet of the fluorine pump 55, and its output end is communicated with the liquid outlet of the fluorine pump 55.

[0083] The first electromagnetic valve 56 is arranged on the fluorine pump refrigeration circuit and is located on the pipeline connecting the liquid storage device 54 and the condenser 52.

[0084] The second electromagnetic valve 57 is arranged on the fluorine pump refrigeration circuit and is located on the pipeline connecting the liquid storage device 54 and the fluorine pump 55.

[0085] The third electromagnetic valve 58 is arranged on the compression refrigeration circuit and is connected in parallel at both ends of the pipeline of the first one-way valve, the liquid storage device and the second one-way valve.

[0086] Specifically, by setting the second pipeline 30, the second one-way valve 301, the first electromagnetic valve 56, the second electromagnetic valve 57 and the third electromagnetic valve 58, the second pipeline 30 is connected in parallel at both ends of the fluorine pump 55. When the ambient temperature is in the low temperature working condition, that is, when the ambient temperature is relatively low, the fluorine pump is started, the first electromagnetic valve 56, the second electromagnetic valve 57 and the first one-way valve are opened, and the third electromagnetic valve 58 and the second one-way valve 301 are closed. In this way, the refrigerant flows through the liquid storage device 54 and the fluorine pump 55. When the ambient temperature is in the high temperature working condition, that is, when the ambient temperature is relatively high, the PCS cooling capacity is insufficient, the compressor is started, the second one-way valve 301 and the third electromagnetic valve 58 are opened, and the first electromagnetic valve 56, the second electromagnetic valve 57 and the first one-way valve are closed. The refrigerant does not flow through the fluorine pump 55 and the liquid storage device 54, and the compression refrigeration is used to make up for the insufficient PCS cooling capacity. The refrigerant flowing out of the condenser 52 flows through the second pipeline.

[0087] The refrigerant filling amount in the fluorine pump refrigeration circuit is large, and there are problems such as high pressure protection when the ambient temperature is in the high temperature working condition. By setting the electromagnetic valve, the liquid storage device 54 is short-circuited by the system control, the system operating pressure is reduced, which is beneficial to ensuring the reliable operation of the refrigerant circulation system.

[0088] On the other hand, in combination with Figure 6 and Figure 7 as shown, Figure 6 in [reference], by connecting the second pipeline 30 in parallel at both ends of the fluorine pump 55 and the liquid storage device 54, no additional electromagnetic valve needs to be arranged on the compression refrigeration circuit, the structure is simplified, and the cost is reduced.

[0089] In some embodiments, the energy storage liquid cooling system further includes an expansion tank, and the first liquid cooling flow path and the second liquid cooling flow path share the same expansion tank. Refer to Figure 1 , or the first liquid cooling flow path and the second liquid cooling flow path are respectively provided with corresponding expansion tanks. Refer to Figure 8 .

[0090] Specifically, by providing an expansion tank, the expansion tank is used to regulate the pressure of the liquid cooling system. When the coolant expands due to heat, the expansion tank can accommodate this additional coolant to prevent the system pressure from being too high; when the coolant cools and contracts, the coolant in the expansion tank can flow back into the system, which is beneficial to maintaining the pressure stability of the two liquid cooling flow paths.

[0091] Combined with Figure 1 , taking the example that the first liquid cooling flow path and the second liquid cooling flow path share the same expansion tank for illustration: The energy storage liquid cooling system includes an expansion tank 40, a first connection pipe 401, a second valve 4011, a second connection pipe 402, and a third valve 4021.

[0092] One end of the first connection pipe 401 is communicated with the first liquid cooling flow path, and the other end of the first connection pipe 401 is communicated with the output end of the expansion tank 40.

[0093] The second valve 4011 is arranged on the first connection pipe 401 and is used to open or close the first connection pipe 401.

[0094] One end of the second connection pipe 402 is communicated with the second liquid cooling flow path, and the other end of the second connection pipe 402 is communicated with the output end of the expansion tank 40.

[0095] The third valve 4021 is arranged on the second connection pipe 402 and is used to open or close the second connection pipe 402.

[0096] When the liquid pressures of the coolant detected by the battery outlet liquid pressure sensor 94, the battery inlet liquid pressure sensor 95, the PCS outlet liquid pressure sensor 96, and the PCS inlet liquid pressure sensor 97 are abnormal, the control module will control the opening or closing of the second valve 4011 and the third valve 4021 so that the liquid pressures of the coolant in the first liquid cooling flow path and the second liquid cooling flow path are kept normal.

[0097] In some embodiments of the present application, the energy storage liquid cooling system further includes a temperature sensor and a pressure sensor, and the temperature sensor and the pressure sensor are respectively arranged at the inlet of the first liquid cooling flow path, the outlet of the first liquid cooling flow path, the inlet of the second liquid cooling flow path, and the outlet of the second liquid cooling flow path.

[0098] Specifically, by setting temperature sensors and pressure sensors, it is convenient to detect the temperature and pressure at the liquid inlet and outlet of the energy storage battery 1 in real time, as well as the temperature and pressure at the liquid inlet and outlet of the PCS 2.

[0099] Specifically, the temperature sensors include a battery outlet temperature sensor 90, a battery inlet temperature sensor 98, a PCS outlet temperature sensor 92, and a PCS inlet temperature sensor 93.

[0100] Specifically, the battery outlet temperature sensor 90 is arranged at the liquid inlet of the first liquid cooling flow path, the battery inlet temperature sensor 98 is arranged at the liquid outlet of the first liquid cooling flow path, the PCS outlet temperature sensor 92 is arranged at the liquid inlet of the second liquid cooling flow path, and the PCS inlet temperature sensor 93 is arranged at the liquid outlet of the second liquid cooling flow path.

[0101] Specifically, the pressure sensors include a battery outlet pressure sensor 94, a battery inlet pressure sensor 95, a PCS outlet pressure sensor 96, and a PCS inlet pressure sensor 97.

[0102] Specifically, the battery outlet pressure sensor 94 is arranged at the liquid inlet of the first liquid cooling flow path, the battery inlet pressure sensor 95 is arranged at the liquid outlet of the first liquid cooling flow path, the PCS outlet pressure sensor 96 is arranged at the liquid inlet of the second liquid cooling flow path, and the PCS inlet pressure sensor 97 is arranged at the liquid outlet of the second liquid cooling flow path.

[0103] In some embodiments of the present application, the energy storage liquid cooling system further includes a replenishing tank 80 and a replenishing pump. The replenishing tank is used to replenish the first liquid cooling flow path and the second liquid cooling flow path. The first liquid cooling flow path and the second liquid cooling flow path share the same replenishing pump. Refer to Figure 1 ; or the first liquid cooling flow path and the second liquid cooling flow path are respectively provided with corresponding replenishing pumps. Refer to Figure 7 .

[0104] Taking the example that the first liquid cooling flow path and the second liquid cooling flow path share the same replenishing pump for illustration, the input end of the replenishing pump is connected to the replenishing tank 80, and the output end of the replenishing pump is respectively connected to the first liquid cooling flow path through a first replenishing branch and to the second liquid cooling flow path through a second replenishing branch.

[0105] Control valves are respectively arranged on the first replenishing branch and the second replenishing branch. Taking the energy storage battery side as an example, when it is detected that the liquid outlet pressure of the energy storage battery is lower than the replenishing pressure, the replenishing pump starts and the corresponding control valve opens to perform replenishment. When the liquid outlet pressure of the energy storage battery reaches the normal range, the replenishment stops. The replenishment process on the PCS side is similar to the above and will not be elaborated here.

[0106] In some other embodiments of the present application, safety valves are provided on both the first liquid cooling flow path and the second liquid cooling flow path, and the output ends of the safety valves are both connected to the liquid replenishing tank 80, so that the coolant discharged by the safety valves can be introduced into the liquid replenishing tank 80 to avoid waste of the coolant.

[0107] In some other embodiments of the present application, the energy storage liquid cooling system further includes a battery water heater 70 and a PCS water heater 71. The battery water heater 70 is located between the heat exchanger 3 and the first liquid outlet chuck; the PCS water heater 71 is located between the air cooling component 6 and the second liquid outlet chuck.

[0108] In some other embodiments of the present application, the first liquid delivery component 4, the second liquid delivery component 7, the first proportional regulating valve 81, the second proportional regulating valve 91, the first valve 101, the compressor 51, the fluorine pump 55, the first check valve 201, the second check valve 301, the first solenoid valve 56, the second solenoid valve 57, the third solenoid valve 58, the second valve 4011, the third valve 4021, the liquid replenishing pump, the control valve, the battery liquid outlet temperature sensor 90, the battery liquid inlet temperature sensor 98, the PCS liquid outlet temperature sensor 92, the PCS liquid inlet temperature sensor 93, the battery liquid outlet pressure sensor 94, the battery liquid inlet pressure sensor 95, the PCS liquid outlet pressure sensor 96, and the PCS liquid inlet pressure sensor 97, etc. are all electrically connected to the control module.

[0109] As shown in the accompanying drawings, the temperature control process of the energy storage liquid cooling system is as follows: In the refrigeration mode: (1) In the first working condition, refer to Figure 2 .

[0110] When T_ring > T_a, for example, T_a = 45 °C, the refrigeration module 5 uses the compressor 51 to circulate and refrigerate, closes the first solenoid valve 56, the second solenoid valve 57, and the first check valve 201, and opens the third solenoid valve 58, the second check valve 301, the first proportional regulating valve 81, and the second proportional regulating valve 91.

[0111] The circulation process of the refrigerant: The high-temperature and high-pressure refrigerant discharged from the compressor 51 is condensed and heat-exchanged through the condenser 52, then passes through the third solenoid valve 58 and the second check valve 301 (without passing through the fluorine pump 55 at this time), the filter, is throttled and depressurized in the electronic expansion valve 53, and then enters the refrigeration end of the heat exchanger 3 for evaporation and heat exchange, and then returns to the compressor 51 for compression.

[0112] Circulation process of the secondary refrigerant: The high-temperature secondary refrigerant coming out of the energy storage battery 1 enters the cold end of the heat exchanger 3 through the first liquid inlet chuck, the first liquid delivery component 4, and the first filter 60 to release heat and cool down. Then, it passes through the battery water heater 70 (not working in the refrigeration mode). Part of the secondary refrigerant enters the first liquid cooling channel through the first liquid outlet chuck to cool down the energy storage battery 1 in a cycle; another part of the secondary refrigerant enters the second liquid cooling flow path through the first branch 8 to compensate for the cooling capacity of the PCS 2.

[0113] PCS liquid cooling circulation process: The high-temperature secondary refrigerant coming out of the PCS 2 converges with the secondary refrigerant from the first branch 8 after passing through the second liquid inlet chuck and then enters the air-cooling component 6 through the second liquid delivery component 7. The air-cooling component 6 uses natural cold source to cool down the secondary refrigerant. Then, the secondary refrigerant passes through the PCS water heater 71 (not working in the refrigeration mode). Part of the secondary refrigerant enters the second liquid cooling channel through the second liquid outlet chuck to cool down the inside of the PCS 2 in a cycle, and another part of the secondary refrigerant enters the first liquid cooling flow path through the second branch 9 for circulation.

[0114] The outlet temperature of the energy storage battery 1 is about 18 - 22 °C, and the outlet temperature of the PCS 2 is about 40 - 55 °C. The outlet temperature To_PCS on the PCS 2 side is used as the target temperature.

[0115] When it is detected that the PCS outlet temperature > To_PCS + △1 °C, control the first proportional regulating valve 81 and the second proportional regulating valve 91 to open wider synchronously, and at the same time, the frequency of the compressor 51 increases by △2 HZ every 30 s until the PCS outlet temperature ≤ To_PCS - △3 °C. At this time, the current opening degrees of the first proportional regulating valve 81 and the second proportional regulating valve 91 and the increased operating frequency of the compressor 51 are maintained until the PCS outlet temperature ≤ To_PCS - △4 °C, then control the first proportional regulating valve 81 and the second proportional regulating valve 91 to close smaller synchronously, and at the same time, the frequency of the compressor 51 decreases by △4 HZ every 30 s. When the PCS outlet temperature ≤ To_PCS - △5 °C, close the first proportional regulating valve 81 and the second proportional regulating valve 91, and the frequency of the compressor 51 is reduced to the operating frequency before frequency increase and maintained, and then it is changed to automatic PID regulation according to the measured outlet temperature To_coil of the energy storage battery 1.

[0116] Exemplary: When To_PCS = 45°C, the outlet liquid temperature To_coil on the side of the energy storage battery 1 is set to 18°C. When To_PCS > 45°C, control the first proportional regulating valve 81 and the second proportional regulating valve 91 to open and close synchronously to ensure that the outlet liquid temperature on the PCS2 side reaches 45°C; at the same time, the frequency of the corresponding compressor 51 is increased to improve the refrigeration performance, ensuring that the outlet liquid temperature To_coil on the side of the energy storage battery 1 ≤ 18°C; when To_PCS ≤ 45°C, control the first proportional regulating valve 81 and the second proportional regulating valve 91 to close synchronously, and at the same time, the frequency of the corresponding compressor 51 is reduced to reduce the cooling capacity output by the compressor 51, maintaining the outlet liquid temperature To_coil on the side of the energy storage battery 1 ≤ 18°C.

[0117] (2) In the second sub-condition one, see Figure 3 .

[0118] When Tb < T_ring ≤ Ta, Ta and Tb can be set. For example, Ta = 45°C and Tb = 5°C. The refrigeration module 5 uses the compressor 51 for cyclic refrigeration, closes the first solenoid valve 56, the second solenoid valve 57, the first proportional regulating valve 81 and the second proportional regulating valve 91, and opens the third solenoid valve 58.

[0119] The high-temperature and high-pressure refrigerant discharged from the compressor 51 undergoes condensation heat exchange through the condenser 52, passes through the third solenoid valve 58 and the second one-way valve 301 (not passing through the fluorine pump 55 at this time), the filter, is throttled and depressurized in the electronic expansion valve 53, and then enters the refrigeration end of the heat exchanger 3 for evaporation heat exchange, and then returns to the compressor 51 for compression.

[0120] The coolant circulation system: The high-temperature coolant coming out of the energy storage battery 1 enters the cold end of the heat exchanger 3 through the first liquid inlet chuck, the first liquid delivery component 4, and the first filter 60 to release heat and cool down, then passes through the battery water heater 70 (not working in the refrigeration mode), and then enters the first liquid cooling channel through the first liquid outlet chuck to cool the energy storage battery 1 in a cycle.

[0121] The PCS liquid cooling circulation process: The coolant coming out of the PCS2 enters the second liquid delivery component 7 and the air-cooling component 6 through the second liquid inlet chuck, completely utilizes the natural cold source of the air-cooling component 6 for refrigeration, the cooled coolant passes through the PCS water heater 71 (not working in the refrigeration mode), and finally enters the second liquid cooling channel through the second liquid outlet chuck to cool the inside of the PCS2 in a cycle.

[0122] (3) In the second sub-condition two, see Figure 4 .

[0123] When the T-ring ≤ Tb, Tb can be set. For example, Tb = 5°C. The refrigeration module 5 uses a fluorine pump 55 for circulating refrigeration. Open the first one-way valve 201, the first solenoid valve 56 and the second solenoid valve 57, and close the third solenoid valve 58, the second one-way valve 301, the first proportional regulating valve 81 and the second proportional regulating valve 91.

[0124] Refrigerant circulation process: The high-temperature and high-pressure refrigerant coming out from the refrigeration end of the heat exchanger 3 enters the condenser 52 through the first one-way valve 201 (without passing through the compressor 51 at this time) for condensation heat exchange, passes through the first solenoid valve 56, the liquid storage device 54, the second solenoid valve 57, enters the fluorine pump 55 for boosting, and then enters the refrigeration end of the heat exchanger 3 through the filter and the electronic expansion valve 53 (the fluorine pump 55 maintains the maximum opening in the circulating refrigeration mode) for evaporation heat exchange, completing the refrigerant circulating refrigeration.

[0125] Circulation process of the secondary refrigerant: The high-temperature secondary refrigerant coming out from the energy storage battery 1 enters the cold-receiving end of the heat exchanger 3 through the first liquid inlet chuck, the first liquid delivery component 4, and the first filter 60 to release heat and cool down, then passes through the battery water heater 70 (the refrigeration mode does not work), and then enters the first liquid cooling channel through the first liquid outlet chuck to cool down the energy storage battery 1 in a cycle.

[0126] PCS liquid cooling circulation process: The secondary refrigerant coming out from the PCS 2 enters the second liquid delivery component 7 and the air-cooling component 6 through the second liquid inlet chuck, and completely uses the natural cold source of the air-cooling component 6 for refrigeration. The cooled secondary refrigerant passes through the PCS water heater 71 (the refrigeration mode does not work), and finally enters the second liquid cooling channel through the second liquid outlet chuck to cool down the inside of the PCS 2 in a cycle.

[0127] In the heating mode, refer to Figure 5 : The refrigeration module 5 does not work, and the refrigerant circulation process does not proceed. In the circulation process of the secondary refrigerant, start the first liquid delivery component 4 and the battery water heater 70, and the battery water heater 70 heats the secondary refrigerant in the first liquid cooling flow path.

[0128] The air-cooling component 6 does not work, start the second liquid delivery component 7 and the PCS water heater 71, and the PCS water heater 71 heats the secondary refrigerant in the second liquid cooling flow path.

[0129] In the description of the above embodiments, the specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0130] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An energy storage liquid cooling system, characterized in that: include: Heat exchanger; A first liquid infusion component, which is connected to the cold end of the heat exchanger to form a first liquid cooling flow path, and the first liquid cooling flow path is used to dissipate heat for the energy storage battery; A refrigeration module, which is connected to the cooling end of the heat exchanger to form a refrigeration circuit; Air-cooled components; A second liquid infusion component, which is connected to the air cooling component to form a second liquid cooling flow path, and the second liquid cooling flow path is used to dissipate heat from the PCS; Wherein, the liquid outlet of the cold end of the heat exchanger is selectively connected to the liquid inlet of the second infusion component through the first branch; the liquid inlet of the first infusion component is selectively connected to the liquid outlet of the air-cooling component through the second branch.

2. The energy storage liquid cooling system according to claim 1, characterized in that: The energy storage liquid cooling system also includes: a first proportional regulating valve, which is arranged in the first branch and is used to regulate the flow of the first branch; a second proportional regulating valve, which is arranged in the second branch and is used to adjust the flow of the second branch; Wherein, the first proportional regulating valve and the second proportional regulating valve are configured to be regulated synchronously.

3. The energy storage liquid cooling system according to claim 1, characterized in that: The energy storage liquid cooling system also includes: A bypass branch, one end of which is connected to the liquid outlet of the first infusion component, and the other end of which is connected to the liquid outlet of the cold end of the heat exchanger; The first valve is arranged on the bypass branch and is used to open or close the bypass branch.

4. The energy storage liquid cooling system according to claim 1, characterized in that: The refrigeration module comprises: A compression refrigeration unit comprises a compressor, a condenser and an electronic expansion valve. The compressor, the condenser, the electronic expansion valve and the cooling end of the heat exchanger are sequentially connected through pipelines to form a compression refrigeration circuit.

5. The energy storage liquid cooling system according to claim 4, characterized in that: The refrigeration module also includes: The fluorine pump refrigeration unit comprises a liquid reservoir, a fluorine pump and the electronic expansion valve. The liquid reservoir, the fluorine pump, the electronic expansion valve and the cooling end of the heat exchanger are sequentially connected through pipelines.

6. The energy storage liquid cooling system according to claim 5, characterized in that: The energy storage liquid cooling system also includes: A first pipeline connected in parallel to both ends of the compressor; The first one-way valve is arranged on the first pipeline, the input end of the first one-way valve is connected to the input end of the compressor, and the output end of the first one-way valve is connected to the output end of the compressor.

7. The energy storage liquid cooling system according to claim 6, characterized in that: The energy storage liquid cooling system also includes: a second pipeline connected in parallel to both ends of the fluorine pump and the liquid reservoir; a second one-way valve, which is arranged on the second pipeline, wherein the input end thereof is connected to the liquid inlet of the liquid reservoir, and the output end thereof is connected to the liquid outlet of the fluorine pump; A first solenoid valve, which is arranged on a pipeline connecting the liquid reservoir and the condenser; The second electromagnetic valve is arranged on the pipeline connecting the liquid reservoir and the fluorine pump.

8. The energy storage liquid cooling system according to claim 6, characterized in that: The energy storage liquid cooling system also includes: A second pipeline connected in parallel to both ends of the fluorine pump; a second one-way valve, which is arranged on the second pipeline, wherein the input end thereof is connected to the liquid inlet of the fluorine pump, and the output end thereof is connected to the liquid outlet of the fluorine pump; A first solenoid valve, which is arranged on a pipeline connecting the liquid reservoir and the condenser; A second solenoid valve, which is arranged on the pipeline connecting the liquid reservoir and the fluorine pump; The third solenoid valve is arranged on a pipeline connected in parallel to both ends of the first solenoid valve, the liquid reservoir and the second solenoid valve.

9. The energy storage liquid cooling system according to claim 1, characterized in that: Under the first working condition, part of the brine in the first liquid cooling circuit flows into the second liquid cooling circuit through the first branch; part of the brine in the second liquid cooling circuit flows into the first liquid cooling circuit synchronously through the second branch, the refrigeration module and the air cooling component are started, the refrigeration module dissipates heat to the energy storage battery and the PCS, and the air cooling component dissipates heat to the PCS; Under the second working condition, the liquid outlet of the cold end of the heat exchanger is disconnected from the liquid inlet of the second infusion component; the liquid inlet of the first infusion component is disconnected from the liquid outlet of the air cooling component, the refrigeration module and the air cooling component are started, the refrigeration module dissipates heat to the energy storage battery, and the air cooling component dissipates heat to the PCS; The ambient temperature under the first working condition is higher than the ambient temperature under the second working condition.

10. The energy storage liquid cooling system according to claim 1, characterized in that: The energy storage liquid cooling system also includes: Expansion tank; a first connecting pipe, one end of which is connected to the first liquid cooling flow path, and the other end of which is connected to the output end of the expansion tank; a second valve, which is disposed on the first connecting pipe and is used to open or close the first connecting pipe; a second connecting pipe, one end of which is connected to the second liquid cooling flow path, and the other end of which is connected to the output end of the expansion tank; The third valve is disposed on the second connecting pipe and is used to open or close the second connecting pipe.

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