Dual-liquid energy storage thermal management system

Abstract

The present invention belongs to the technical field of energy storage thermal management and discloses a dual-liquid energy storage thermal management system. The dual-liquid energy storage thermal management system includes a battery pack, a heat exchanger, a compressor, a condenser, a throttling element, an energy storage converter, a first dry cooler, a second dry cooler, a four-way reversing valve, an electromagnetic three-way valve, a first electromagnetic two-way valve, a second electromagnetic two-way valve and a one-way valve. Condensing fans are respectively provided at the condenser, the first dry cooler and the second dry cooler. Among them, the compressor is selectively started and the interfaces of the electromagnetic three-way valve are opened and closed to realize the dual circulation of the refrigerant circuit and the coolant circuit; the interface of the four-way reversing valve is selectively connected to realize the cooling and heating switching of the refrigerant circuit; the electromagnetic three-way valve, the first electromagnetic two-way valve and the second electromagnetic two-way valve connect the battery pack cooling or heating circuit with the energy storage converter cooling circuit. The dual-liquid energy storage thermal management system has high integration, diversified functions and high working efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage thermal management, and in particular to a dual-liquid energy storage thermal management system. Background Art

[0002] Since energy conversion efficiency is a very important indicator in the energy storage thermal management system, the energy storage thermal management system should have a smaller energy consumption to ensure the high energy conversion efficiency of the energy storage thermal management system.

[0003] The battery thermal management system and the power conversion system (PCS) system are two important management links in the energy storage thermal management system. Currently, the liquid-cooled energy storage system is mainly used for cooling in these two management links. The liquid-cooled energy storage system is a system that uses liquid as a cooling medium to remove the heat generated by the equipment through circulation. Its main function is to ensure the stable operation of core equipment such as batteries and energy storage converters, and to improve energy utilization efficiency. However, the battery thermal management system and the energy storage converter system in the prior art are separate, that is, the energy storage converter cooling system is independent of the battery thermal management cooling system. The entire energy storage thermal management system has low integration, and the system operating mode cannot be selected according to the ambient temperature, resulting in low working efficiency.

[0004] Therefore, it is urgent to propose a dual-liquid energy storage thermal management system to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a dual-liquid energy storage thermal management system that can connect the battery pack cooling or heating circuit with the energy storage inverter cooling circuit, with high system integration; it can select different operating modes according to the ambient temperature, making the system functionally diversified and highly efficient.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A dual-liquid energy storage thermal management system includes a battery pack, a heat exchanger, a compressor, a condenser, a throttling element, an energy storage converter, a first dry cooler, a second dry cooler, a four-way reversing valve, an electromagnetic three-way valve, a first electromagnetic two-way valve, a second electromagnetic two-way valve, and a one-way valve. The condenser, the first dry cooler, and the second dry cooler are respectively provided with condensing fans, wherein:

[0008] The compressor is selectively started, the refrigerant inlet of the compressor and the refrigerant outlet of the compressor are respectively communicated with the second interface of the four-way reversing valve and the fourth interface of the four-way reversing valve, the refrigerant inlet and outlet at both ends of the heat exchanger are respectively communicated with the first interface of the four-way reversing valve and one end of the throttling element, the refrigerant inlet and outlet at both ends of the condenser are respectively communicated with the third interface of the four-way reversing valve and the other end of the throttling element, the first interface of the four-way reversing valve can be selectively communicated with one of the second interface of the four-way reversing valve and the fourth interface of the four-way reversing valve, and the third interface of the four-way reversing valve can be selectively communicated with one of the second interface of the four-way reversing valve and the fourth interface of the four-way reversing valve;

[0009] The coolant outlet of the battery pack is connected to the first interface of the electromagnetic three-way valve, the coolant inlet of the battery pack is respectively connected to the coolant outlet of the heat exchanger and the coolant outlet of the one-way valve, the coolant inlet of the heat exchanger is respectively connected to the third interface of the electromagnetic three-way valve, the second interface of the electromagnetic three-way valve is respectively connected to the coolant inlet of the first dry cooler and the first interface of the electromagnetic two-way valve, the coolant outlet of the first dry cooler is respectively connected to the first interface of the second electromagnetic two-way valve and the coolant inlet of the one-way valve, the coolant inlet of the energy storage converter is respectively connected to the second interface of the second electromagnetic two-way valve and the coolant outlet of the second dry cooler, and the coolant outlet of the energy storage converter is respectively connected to the second interface of the first electromagnetic two-way valve and the coolant inlet of the second dry cooler, the first interface of the electromagnetic three-way valve, the second interface of the electromagnetic three-way valve and the third interface of the electromagnetic three-way valve are interconnected, the first interface of the first electromagnetic two-way valve is connected to the second interface of the first electromagnetic two-way valve, and the first interface of the second electromagnetic two-way valve is connected to the second interface of the second electromagnetic two-way valve.

[0010] As an optional technical solution for a dual-liquid energy storage thermal management system, the compressor is started, and in the four-way reversing valve, the first interface of the four-way reversing valve is connected to the second interface of the four-way reversing valve, the third interface of the four-way reversing valve is connected to the fourth interface of the four-way reversing valve, and the other interfaces of the four-way reversing valve are not connected; in the electromagnetic three-way valve, only the second interface of the electromagnetic three-way valve is closed; the two interfaces of the first electromagnetic two-way valve and the two interfaces of the second electromagnetic two-way valve are both opened.

[0011] As an optional technical solution for a dual-liquid energy storage thermal management system, the compressor is started, and in the four-way reversing valve, the first interface of the four-way reversing valve is connected to the second interface of the four-way reversing valve, the third interface of the four-way reversing valve is connected to the fourth interface of the four-way reversing valve, and the other interfaces of the four-way reversing valve are not connected; in the solenoid three-way valve, all interfaces of the solenoid three-way valve are open; and the first solenoid two-way valve and the second solenoid two-way valve are both closed.

[0012] As an optional technical solution for the dual-liquid energy storage thermal management system, the compressor is not started, and in the electromagnetic three-way valve, only the third interface of the electromagnetic three-way valve is closed; the first electromagnetic two-way valve and the second electromagnetic two-way valve are both closed.

[0013] As an optional technical solution for a dual-liquid energy storage thermal management system, the compressor is started, and in the four-way reversing valve, the first interface of the four-way reversing valve is connected to the fourth interface of the four-way reversing valve, the third interface of the four-way reversing valve is connected to the second interface of the four-way reversing valve, and the other interfaces of the four-way reversing valve are not connected; in the electromagnetic three-way valve, only the second interface of the electromagnetic three-way valve is closed; the two interfaces of the first electromagnetic two-way valve and the two interfaces of the second electromagnetic two-way valve are both opened.

[0014] As an optional technical solution of the dual-liquid energy storage thermal management system, the dual-liquid energy storage thermal management system further includes a first water pump, which is located between the battery pack and the electromagnetic three-way valve.

[0015] As an optional technical solution of the dual-liquid energy storage thermal management system, the dual-liquid energy storage thermal management system further includes a first expansion tank, which is located between the first water pump and the battery pack.

[0016] As an optional technical solution of the dual-liquid energy storage thermal management system, the dual-liquid energy storage thermal management system further includes a second water pump, which is located at the coolant outlet end of the energy storage converter.

[0017] As an optional technical solution of the dual-liquid energy storage thermal management system, the dual-liquid energy storage thermal management system further includes a second expansion tank, which is located between the second water pump and the energy storage converter.

[0018] As an optional technical solution of the dual-liquid energy storage thermal management system, the dual-liquid energy storage thermal management system further includes a PTC liquid heater, which is located at the coolant inlet end of the battery pack.

[0019] Beneficial effects of the present invention:

[0020] The dual-liquid energy storage thermal management system provided by the present invention includes a battery pack, a heat exchanger, a compressor, a condenser, a throttling element, an energy storage converter, a first dry cooler, a second dry cooler, a four-way reversing valve, an electromagnetic three-way valve, a first electromagnetic two-way valve, a second electromagnetic two-way valve, and a one-way valve. The condenser, the first dry cooler, and the second dry cooler are each provided with a condensing fan to increase the heat exchange efficiency of the condenser. The first dry cooler and the second dry cooler can both utilize the temperature difference between the outlet water temperature and the inlet air temperature to dissipate heat, thereby improving the heat dissipation efficiency of the first and second dry coolers. The compressor, heat exchanger, throttling element, condenser, and four-way reversing valve form a refrigerant circulation loop. The battery pack, three-way valve, first two-way valve, second two-way valve, one-way valve, heat exchanger, energy storage converter, first dry cooler, and second dry cooler form a coolant circulation loop (including a coolant circulation loop on the battery pack side and an antifreeze circulation loop on the energy storage converter side). On the one hand, the dual-liquid energy storage thermal management system realizes dual circulation of the refrigerant circuit and the coolant circuit through the selective start-up of the compressor and the opening and closing of each interface of the electromagnetic three-way valve, and uses the refrigerant circuit to cool or heat the battery pack, thereby improving the heat exchange efficiency of the battery pack; the interface of the four-way reversing valve is selectively connected to realize the cooling and heating switching of the refrigerant circuit, and the system integration is high. On the other hand, the dual-liquid energy storage thermal management system connects the battery pack cooling or heating circuit with the energy storage inverter cooling circuit through the electromagnetic three-way valve, the first electromagnetic two-way valve and the second electromagnetic two-way valve, and the system integration is high. On the other hand, the dual-liquid energy storage thermal management system is circumferentially connected through the interface of the four-way reversing valve, and the selective opening and closing of the electromagnetic three-way valve, the first electromagnetic two-way valve and the second electromagnetic two-way valve diversify the system functions, thereby enabling the system to select different working modes according to the ambient temperature, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a dual-liquid energy storage thermal management system provided by an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the first working mode of the dual-liquid energy storage thermal management system provided by an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the second working mode of the dual-liquid energy storage thermal management system provided by an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the third working mode of the dual-liquid energy storage thermal management system provided by an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the fourth working mode of the dual-liquid energy storage thermal management system provided by an embodiment of the present invention.

[0026] In the picture:

[0027] 1. Battery pack; 2. Heat exchanger; 3. Compressor; 4. Condenser; 5. Throttling element; 6. Energy storage converter; 7. First dry cooler; 8. Second dry cooler; 9. Four-way reversing valve; 10. Solenoid three-way valve; 11. First solenoid two-way valve; 12. Second solenoid two-way valve; 13. One-way valve; 14. First water pump; 15. Second water pump; 16. First expansion tank; 17. Second expansion tank; 18. PTC liquid heater. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0029] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0032] The dual-liquid energy storage thermal management system provided in this embodiment can connect the battery pack cooling or heating circuit with the energy storage inverter cooling circuit, with high system integration; it can select different operating modes according to the ambient temperature, making the system functionally diverse and highly efficient.

[0033] Specifically, if Figure 1 As shown, the dual-liquid energy storage thermal management system includes a battery pack 1, a heat exchanger 2, a compressor 3, a condenser 4, a throttling element 5, an energy storage converter 6, a first dry cooler 7, a second dry cooler 8, a four-way reversing valve 9, an electromagnetic three-way valve 10, a first electromagnetic two-way valve 11, a second electromagnetic two-way valve 12, and a one-way valve 13. Condensing fans are respectively provided at the condenser 4, the first dry cooler 7, and the second dry cooler 8. The compressor 3 is selectively started, and the refrigerant inlet and outlet of the compressor 3 are respectively connected to the second interface and the fourth interface of the four-way reversing valve 9. The refrigerant inlet and outlet at both ends of the heat exchanger 2 are respectively connected to the first interface of the four-way reversing valve 9 and one end of the throttling element 5. The refrigerant inlet and outlet at both ends of the condenser 4 are respectively connected to the third interface of the four-way reversing valve 9 and the other end of the throttling element 5. The first interface of the four-way reversing valve 9 can be connected to one of the second interface of the four-way reversing valve 9 and the fourth interface of the four-way reversing valve 9. The third interface of the four-way reversing valve 9 can be connected to one of the second interface of the four-way reversing valve 9 and the fourth interface of the four-way reversing valve 9.

[0034] The coolant outlet of battery pack 1 is connected to the first port of electromagnetic three-way valve 10; the coolant inlet of battery pack 1 is connected to the coolant outlet of heat exchanger 2 and the coolant outlet of check valve 13, respectively. The coolant inlet of heat exchanger 2 is connected to the third port of electromagnetic three-way valve 10. The second port of electromagnetic three-way valve 10 is connected to the coolant inlet of first dry cooler 7 and the first port of electromagnetic two-way valve, respectively. The coolant outlet of first dry cooler 7 is connected to the first port of second electromagnetic two-way valve 12 and the coolant inlet of check valve 13, respectively. The coolant inlet of energy storage converter 6 is connected to the second port of second electromagnetic two-way valve 12 and the coolant outlet of second dry cooler 8, respectively. The coolant outlet of energy storage converter 6 is connected to the second port of first electromagnetic two-way valve 11 and the coolant inlet of second dry cooler 8, respectively. The first port, second port, and third port of electromagnetic three-way valve 10 are interconnected. The first interface of the first electromagnetic two-way valve 11 is communicated with the second interface of the first electromagnetic two-way valve 11 , and the first interface of the second electromagnetic two-way valve 12 is communicated with the second interface of the second electromagnetic two-way valve 12 .

[0035] Based on the above design, the compressor 3, heat exchanger 2, throttling element 5, condenser 4, and four-way reversing valve 9 form a refrigerant circulation loop (dashed line frame in the figure). The battery pack 1, three-way valve, first two-way valve, second two-way valve, one-way valve 13, heat exchanger 2, energy storage converter 6, first dry cooler 7, and second dry cooler 8 form a coolant circulation loop (solid line frame in the figure). Specifically, the refrigeration cycle of the refrigerant is as follows: the compressor 3 is started, the refrigerant enters the compressor 3 and is compressed to form a high-temperature and high-pressure gaseous refrigerant; the high-temperature and high-pressure gaseous refrigerant is discharged from the compressor 3 and enters the condenser 4 through the four-way reversing valve 9, where it condenses and dissipates heat to form a medium-temperature and medium-pressure liquid refrigerant; the medium-temperature and medium-pressure liquid refrigerant is then throttled by the throttling element 5, and the pressure and temperature drop to form a low-temperature and low-pressure liquid refrigerant; the low-temperature and low-pressure liquid refrigerant then passes through the heat exchanger 2, where it evaporates and absorbs heat to form a gas-liquid two-phase refrigerant, and the gas-liquid two-phase refrigerant is discharged from the heat exchanger 2 and then returns to the compressor 3 through the four-way reversing valve 9, and circulates in sequence. The refrigerant heating cycle is as follows: compressor 3 is activated, and refrigerant enters compressor 3 for compression, forming a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant is discharged from compressor 3 and passes through four-way reversing valve 9 into heat exchanger 2, where it condenses and dissipates heat, forming a medium-temperature, medium-pressure liquid refrigerant. This medium-temperature, medium-pressure liquid refrigerant is then throttled by throttling element 5, causing its pressure and temperature to drop, forming a low-temperature, low-pressure liquid refrigerant. This low-temperature, low-pressure liquid refrigerant then passes through condenser 4, where it evaporates and absorbs heat, forming a gas-liquid two-phase refrigerant. This gas-liquid two-phase refrigerant is discharged from condenser 4 and then returns to compressor 3 through four-way reversing valve 9, continuing the cycle. A condensing fan is installed at condenser 4 to improve its heat exchange efficiency.

[0036] On the one hand, the dual-liquid energy storage thermal management system realizes dual circulation of the refrigerant circuit and the coolant circuit through the selective start-up of the compressor 3 and the opening and closing of each interface of the electromagnetic three-way valve 10, and uses the refrigerant circuit to cool or heat the battery pack 1, thereby improving the heat exchange efficiency of the battery pack 1; the interface of the four-way reversing valve 9 is selectively connected to realize the cooling and heating switching of the refrigerant circuit, and the system integration is high. On the other hand, the dual-liquid energy storage thermal management system connects the battery pack 1 cooling or heating circuit with the energy storage converter 6 cooling circuit through the electromagnetic three-way valve 10, the first electromagnetic two-way valve 11 and the second electromagnetic two-way valve 12, and the system integration is high. On the other hand, the dual-liquid energy storage thermal management system is circumferentially connected through the interface of the four-way reversing valve 9, and the selective opening and closing of the electromagnetic three-way valve 10, the first electromagnetic two-way valve 11 and the second electromagnetic two-way valve 12 diversifies the system functions, thereby enabling the system to select different working modes according to the ambient temperature, thereby improving work efficiency.

[0037] In this embodiment, both the first dry cooler 7 and the second dry cooler 8 are air-to-water radiators. These radiators utilize the temperature difference between the outlet water temperature and the inlet air temperature to dissipate heat, improving installation and maintenance convenience. Condensing fans are provided in each of the first dry cooler 7 and the second dry cooler 8, further increasing their heat dissipation efficiency.

[0038] The dual-liquid energy storage thermal management system includes working mode 1, working mode 2, working mode 3 and working mode 4. When the ambient temperature T is greater than or equal to the first set temperature T1, the dual-liquid energy storage thermal management system selects working mode 1; when the ambient temperature T is less than the first set temperature T1 and greater than the second set temperature T2, the dual-liquid energy storage thermal management system selects working mode 2; when the ambient temperature T is less than or equal to the second set temperature T1 and greater than the third set temperature T3, the dual-liquid energy storage thermal management system selects working mode 3; when the ambient temperature T is less than or equal to the third set temperature T3, the dual-liquid energy storage thermal management system selects working mode 4. It should be noted that the values ​​of the first set temperature T1, the second set temperature T2 and the third set temperature T3 decrease in sequence.

[0039] In this embodiment, the coolant is antifreeze.

[0040] Working mode 1 (T≥T1): Figure 2 As shown, the compressor 3 is started, and in the four-way reversing valve 9, the first interface of the four-way reversing valve 9 is connected to the second interface of the four-way reversing valve 9, the third interface of the four-way reversing valve 9 is connected to the fourth interface of the four-way reversing valve 9, and the other interfaces of the four-way reversing valve 9 are not connected; in the electromagnetic three-way valve 10, only the second interface of the electromagnetic three-way valve 10 is closed; the two interfaces of the first electromagnetic two-way valve 11 and the two interfaces of the second electromagnetic two-way valve 12 are both open.

[0041] Figure 2 The green arrow in the middle indicates the circulation direction of the refrigerant, and the red arrow indicates the circulation direction of the coolant.

[0042] This operating mode achieves high-temperature cooling of both the battery pack 1 and the energy storage inverter 6. Specifically, the coolant on the battery pack 1 side flows sequentially through the battery pack 1 and heat exchanger 2 to complete the cycle. The refrigerant then flows sequentially through the compressor 3, four-way reversing valve 9, condenser 4, throttling element 5, and heat exchanger 2 to complete the cycle. The low-temperature, low-pressure liquid refrigerant in the heat exchanger 2 absorbs heat from the coolant to cool the battery pack 1. This refrigerant cooling circuit improves the heat exchange efficiency of the battery pack 1 in ultra-high temperature environments (ambient temperature T≥T). The coolant on the energy storage inverter 6 side flows through the first and second dry coolers 7 and 8 before returning to the energy storage inverter 6 to complete the cycle. The temperature difference between the coolant and the air in the first and second dry coolers 7 and 8 is used to cool the energy storage inverter 6. Through these two dry coolers, the cooling requirements of the energy storage inverter 6 in ultra-high temperature environments are met.

[0043] Working mode 2 (when T2<T<T1): Figure 3 As shown, the compressor 3 is started, and in the four-way reversing valve 9, the first interface of the four-way reversing valve 9 is connected to the second interface of the four-way reversing valve 9, the third interface of the four-way reversing valve 9 is connected to the fourth interface of the four-way reversing valve 9, and the other interfaces of the four-way reversing valve 9 are not connected; in the electromagnetic three-way valve 10, all interfaces of the electromagnetic three-way valve 10 are open; the first electromagnetic two-way valve 11 and the second electromagnetic two-way valve 12 are both closed.

[0044] Figure 3 The green arrow in the middle indicates the circulation direction of the refrigerant, and the red arrow indicates the circulation direction of the coolant.

[0045] This operating mode enables hybrid cooling of the battery pack 1 and cooling of the energy storage converter 6. Specifically, the coolant on the battery pack 1 side flows through the electromagnetic three-way valve 10 and is divided into two paths: one path passes through the first dry cooler 7 and the one-way valve 13, and the other path passes through the heat exchanger 2. After merging, the refrigerant returns to the battery pack 1 to complete the cycle. The refrigerant flows through the compressor 3, the four-way reversing valve 9, the condenser 4, the throttling element 5, and the heat exchanger 2 to complete the cycle. Part of the heat from the battery pack 1 is absorbed by the low-temperature, low-pressure liquid refrigerant in the heat exchanger 2, while the remaining heat is dissipated by utilizing the temperature difference between the coolant and the air in the first dry cooler 7. Through the refrigerant refrigeration circuit and the heat dissipation of the first dry cooler 7, hybrid cooling is achieved to meet the heat exchange requirements of the battery pack 1 in a high-temperature environment (T2 < ambient temperature T < T1). The coolant on the energy storage converter 6 side flows through the second dry cooler 8 and returns to the energy storage converter 6, completing the cycle. The temperature difference between the coolant and the air in the second dry cooler 8 is used to cool the energy storage converter 6, meeting the cooling requirements of the energy storage converter 6 in a high temperature environment.

[0046] Working mode 3 (T3<T≤T2): Figure 4As shown, the compressor 3 is not started, and in the electromagnetic three-way valve 10, only the third interface of the electromagnetic three-way valve 10 is closed; the first electromagnetic two-way valve 11 and the second electromagnetic two-way valve 12 are both closed.

[0047] Figure 4 The red arrow in the middle indicates the circulation direction of the coolant.

[0048] This working mode realizes the low-temperature cooling process of the battery pack 1 and the energy storage inverter 6. Specifically, the coolant on the battery pack 1 side flows through the electromagnetic three-way valve 10, the first dry cooler 7 and the one-way valve 13 in sequence to return to the battery pack 1 to complete the cycle, and the temperature difference between the coolant and the air in the first dry cooler 7 is used to cool the battery pack 1, thereby meeting the cooling requirement of the battery pack 1 in a low-temperature environment (T3 < environment T ≤ T2); the coolant on the energy storage inverter 6 side flows through the second dry cooler 8 and returns to the energy storage inverter 6 to complete the cycle, and the temperature difference between the coolant and the air in the second dry cooler 8 is used to cool the energy storage inverter 6, thereby meeting the cooling requirement of the energy storage inverter 6 in a low-temperature environment.

[0049] Working mode 4 (T≤T3): Figure 4 As shown, the compressor 3 is started, and in the four-way reversing valve 9, the first interface of the four-way reversing valve 9 is connected to the fourth interface of the four-way reversing valve 9, the third interface of the four-way reversing valve 9 is connected to the second interface of the four-way reversing valve 9, and the other interfaces of the four-way reversing valve 9 are not connected; in the electromagnetic three-way valve 10, only the second interface of the electromagnetic three-way valve 10 is closed; the two interfaces of the first electromagnetic two-way valve 11 and the two interfaces of the second electromagnetic two-way valve 12 are both open.

[0050] Figure 5 The green arrow in the middle indicates the circulation direction of the refrigerant, and the red arrow indicates the circulation direction of the coolant.

[0051] This operating mode enables heating of the battery pack 1 and cooling of the energy storage inverter 6. Specifically, the coolant on the battery pack 1 side flows through the heat exchanger 2 and returns to the battery pack 1, completing the cycle. The refrigerant then flows sequentially through the compressor 3, the four-way reversing valve 9, the heat exchanger 2, the throttling element 5, and the condenser 4, returning to the compressor 3, completing the cycle. The high-temperature, high-pressure gaseous refrigerant in the heat exchanger 2 releases heat to the coolant, heating the battery pack 1. This refrigerant heating cycle meets the heating requirements of the battery pack 1 in ultra-low ambient temperatures (ambient temperature T≤T3). The coolant on the energy storage inverter 6 side flows through the first and second dry coolers 7 and 8, respectively, and then returns to the energy storage inverter 6, completing the cycle. The temperature difference between the coolant and the air in the first and second dry coolers 7 and 8 is used to cool the energy storage inverter 6, meeting the cooling requirements of the energy storage inverter 6 in ultra-low ambient temperatures.

[0052] In this embodiment, the dual-liquid energy storage thermal management system further includes a PTC liquid heater 18, which is located at the coolant inlet end of the battery pack 1. In working mode 4, the PTC liquid heater 18 is used to heat the coolant to improve the heat exchange efficiency of the system.

[0053] Optionally, the dual-liquid energy storage thermal management system further includes a first water pump 14, which is located between the battery pack 1 and the electromagnetic three-way valve 10 to increase the flow rate and flow velocity of the coolant.

[0054] Furthermore, the dual-liquid energy storage thermal management system also includes a first expansion tank 16, which is located between the first water pump 14 and the battery pack 1 and can stabilize the pressure of the coolant circuit system.

[0055] Optionally, the dual-liquid energy storage thermal management system further includes a second water pump 15 , which is located at the coolant outlet of the energy storage converter 6 to increase the flow rate and flow velocity of the coolant.

[0056] Furthermore, the dual-liquid energy storage thermal management system also includes a second expansion tank 17, which is located between the second water pump 15 and the energy storage converter 6 and can stabilize the pressure of the coolant circuit system.

[0057] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Double-liquid energy storage thermal management system, characterized in that: The invention comprises a battery pack (1), a heat exchanger (2), a compressor (3), a condenser (4), a throttling element (5), an energy storage converter (6), a first dry cooler (7), a second dry cooler (8), a four-way reversing valve (9), an electromagnetic three-way valve (10), a first electromagnetic two-way valve (11), a second electromagnetic two-way valve (12) and a one-way valve (13), wherein the condenser (4), the first dry cooler (7) and the second dry cooler (8) are respectively provided with condensing fans, wherein: The compressor (3) is selectively started, the refrigerant inlet of the compressor (3) and the refrigerant outlet of the compressor (3) are respectively communicated with the second interface of the four-way reversing valve (9) and the fourth interface of the four-way reversing valve (9), the refrigerant inlet and outlet at both ends of the heat exchanger (2) are respectively communicated with the first interface of the four-way reversing valve (9) and one end of the throttling element (5), the refrigerant inlet and outlet at both ends of the condenser (4) are respectively communicated with the third interface of the four-way reversing valve (9) and the other end of the throttling element (5), the first interface of the four-way reversing valve (9) can be selected to be communicated with one of the second interface of the four-way reversing valve (9) and the fourth interface of the four-way reversing valve (9), and the third interface of the four-way reversing valve (9) can be selected to be communicated with one of the second interface of the four-way reversing valve (9) and the fourth interface of the four-way reversing valve (9); The coolant outlet of the battery pack (1) is connected to the first interface of the electromagnetic three-way valve (10), the coolant inlet of the battery pack (1) is connected to the coolant outlet of the heat exchanger (2) and the coolant outlet of the one-way valve (13), the coolant inlet of the heat exchanger (2) is connected to the third interface of the electromagnetic three-way valve (10), the second interface of the electromagnetic three-way valve (10) is connected to the coolant inlet of the first dry cooler (7) and the first interface of the electromagnetic two-way valve, the coolant outlet of the first dry cooler (7) is connected to the first interface of the second electromagnetic two-way valve (12) and the coolant inlet of the one-way valve (13), the coolant outlet of the energy storage converter (6) is connected to the coolant outlet of the first dry cooler (7) and the first interface of the second electromagnetic two-way valve (12) and the coolant inlet of the one-way valve (13), the coolant outlet of the first dry cooler (7) is connected to the first interface of the second electromagnetic two-way valve (12) and the coolant outlet of the one-way valve (13), the coolant outlet of the energy storage converter (6) is connected to the coolant outlet of the first dry cooler (7 ...). The cooling liquid inlet is respectively connected to the second interface of the second electromagnetic two-way valve (12) and the cooling liquid outlet of the second dry cooler (8); the cooling liquid outlet of the energy storage converter (6) is respectively connected to the second interface of the first electromagnetic two-way valve (11) and the cooling liquid inlet of the second dry cooler (8); the first interface of the electromagnetic three-way valve (10), the second interface of the electromagnetic three-way valve (10) and the third interface of the electromagnetic three-way valve (10) are interconnected; the first interface of the first electromagnetic two-way valve (11) and the second interface of the first electromagnetic two-way valve (11) are communicated; and the first interface of the second electromagnetic two-way valve (12) and the second interface of the second electromagnetic two-way valve (12) are communicated.

2. The dual-liquid energy storage thermal management system according to claim 1, characterized in that: The compressor (3) is started, and in the four-way reversing valve (9), the first interface of the four-way reversing valve (9) is connected to the second interface of the four-way reversing valve (9), the third interface of the four-way reversing valve (9) is connected to the fourth interface of the four-way reversing valve (9), and the other interfaces of the four-way reversing valve (9) are not connected; in the electromagnetic three-way valve (10), only the second interface of the electromagnetic three-way valve (10) is closed; the two interfaces of the first electromagnetic two-way valve (11) and the two interfaces of the second electromagnetic two-way valve (12) are both opened.

3. The dual-liquid energy storage thermal management system according to claim 1, characterized in that: The compressor (3) is started, and in the four-way reversing valve (9), the first interface of the four-way reversing valve (9) is connected to the second interface of the four-way reversing valve (9), the third interface of the four-way reversing valve (9) is connected to the fourth interface of the four-way reversing valve (9), and the other interfaces of the four-way reversing valve (9) are not connected; in the electromagnetic three-way valve (10), all interfaces of the electromagnetic three-way valve (10) are opened; and the first electromagnetic two-way valve (11) and the second electromagnetic two-way valve (12) are both closed.

4. The dual-liquid energy storage thermal management system according to claim 1, characterized in that: The compressor (3) is not started, and in the electromagnetic three-way valve (10), only the third interface of the electromagnetic three-way valve (10) is closed; the first electromagnetic two-way valve (11) and the second electromagnetic two-way valve (12) are both closed.

5. The dual-liquid energy storage thermal management system according to claim 1, characterized in that: The compressor (3) is started, and in the four-way reversing valve (9), the first interface of the four-way reversing valve (9) is connected to the fourth interface of the four-way reversing valve (9), the third interface of the four-way reversing valve (9) is connected to the second interface of the four-way reversing valve (9), and the other interfaces of the four-way reversing valve (9) are not connected; in the electromagnetic three-way valve (10), only the second interface of the electromagnetic three-way valve (10) is closed; the two interfaces of the first electromagnetic two-way valve (11) and the two interfaces of the second electromagnetic two-way valve (12) are both opened.

6. The dual-liquid energy storage thermal management system according to any one of claims 1 to 5, characterized in that: The dual-liquid energy storage thermal management system further comprises a first water pump (14), wherein the first water pump (14) is located between the battery pack (1) and the electromagnetic three-way valve (10).

7. The dual-liquid energy storage thermal management system according to claim 6, characterized in that: The dual-liquid energy storage thermal management system further includes a first expansion tank (16), wherein the first expansion tank (16) is located between the first water pump (14) and the battery pack (1).

8. The dual-liquid energy storage thermal management system according to any one of claims 1 to 5, characterized in that: The dual-liquid energy storage thermal management system further comprises a second water pump (15), and the second water pump (15) is located at the coolant outlet end of the energy storage converter (6).

9. The dual-liquid energy storage thermal management system according to claim 8, characterized in that: The dual-liquid energy storage thermal management system further comprises a second expansion tank (17), wherein the second expansion tank (17) is located between the second water pump (15) and the energy storage converter (6).

10. The dual-liquid energy storage thermal management system according to any one of claims 1 to 5, characterized in that: The dual-liquid energy storage thermal management system further comprises a PTC liquid heater (18), and the PTC liquid heater (18) is located at the coolant inlet end of the battery pack (1).

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