Double-liquid energy storage heat management system

Abstract

The invention belongs to the technical field of energy storage heat management, and discloses a double-liquid energy storage heat management system. The double-liquid energy storage heat management system comprises 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 condensation fan. Wherein the compressor is selectively started, and each interface of the electromagnetic three-way valve is opened and closed, so that double circulation of a refrigerant loop and a cooling liquid loop is realized; interfaces of the four-way reversing valve are selectively communicated, so that refrigerating and heating switching of the refrigerant loop is realized; the electromagnetic three-way valve, the first electromagnetic two-way valve and the second electromagnetic two-way valve connect the battery pack refrigerating or heating loop with the energy storage converter refrigerating loop. The double-liquid energy storage heat management system is high in integration level, diversified in function and high in 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) 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 and removes the heat generated by the equipment through a circulating flow. 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 a low degree of 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, which can connect the battery pack cooling or heating circuit with the energy storage inverter cooling circuit, and has high system integration; it can select different working modes according to the ambient temperature, so that the system functions are diversified and the working efficiency is high.

[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, wherein 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 selected to be 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 selected to be 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 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, 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 electromagnetic three-way valve, all interfaces of the electromagnetic three-way valve are opened; the first electromagnetic two-way valve and the second electromagnetic 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 among 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 also 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, and the first expansion tank 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 inverter.

[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, and the second expansion tank 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 also includes a PTC liquid heater, and the PTC liquid heater 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. Condensing fans are respectively provided at the condenser, the first dry cooler and the second dry cooler to accelerate the heat exchange efficiency of the condenser; the first dry cooler and the second dry cooler can both use 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 dry cooler and the second dry cooler. The compressor, the heat exchanger, the throttling element, the condenser and the four-way reversing valve form a refrigerant circulation loop. The battery pack, the three-way valve, the first two-way valve, the second two-way valve, the one-way valve, the heat exchanger, the energy storage converter, the first dry cooler and the 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 to improve 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 electromagnetic three-way valve, the first electromagnetic two-way valve and the second electromagnetic two-way valve are selectively opened and closed, and the system functions are diversified, so that the system can select different working modes according to the ambient temperature to improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 It is a principle diagram of working mode 1 of a dual-liquid energy storage thermal management system provided by an embodiment of the present invention;

[0023] Figure 3 It is a principle diagram of working mode 2 of a dual-liquid energy storage thermal management system provided by an embodiment of the present invention;

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

[0025] Figure 5 It is a schematic diagram of working mode 4 of the dual-liquid energy storage thermal management system provided in an embodiment of the present invention.

[0026] In the figure:

[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. Check 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 in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0031] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[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, and the system integration is high; different working modes can be selected according to the ambient temperature, making the system function diversified and the working efficiency high.

[0033] Specifically, 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. Among them, the compressor 3 is selectively started, and the refrigerant inlet of the compressor 3 and the refrigerant outlet of the compressor 3 are respectively connected to 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 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, and 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 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 respectively. 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 respectively. 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 respectively. The coolant inlet of the energy storage converter 6 is connected to the second interface of the second electromagnetic two-way valve 12 and the coolant outlet of the second dry cooler 8 respectively; the coolant outlet of the energy storage converter 6 is connected to the second interface of the first electromagnetic two-way valve 11 and the coolant inlet of the second dry cooler 8 respectively. 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 connected to each other. 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, the heat exchanger 2, the throttling element 5, the condenser 4 and the four-way reversing valve 9 form a refrigerant circulation loop (the dotted line frame in the figure). The battery pack 1, the three-way valve, the first two-way valve, the second two-way valve, the one-way valve 13, the heat exchanger 2, the energy storage converter 6, the first dry cooler 7 and the second dry cooler 8 form a coolant circulation loop (the solid line frame in the figure). Specifically, the refrigeration cycle of the refrigerant is as follows: start the compressor 3, 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 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 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 returns to the compressor 3 through the four-way reversing valve 9, and circulates in sequence. The heating cycle of the refrigerant is as follows: start the compressor 3, 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 heat exchanger 2 through the four-way reversing valve 9, condenses and dissipates heat in the heat exchanger 2 to form a medium-temperature and medium-pressure liquid refrigerant; the medium-temperature and medium-pressure liquid refrigerant is 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 passes through the condenser 4, evaporates and absorbs heat in the condenser 4 to form a gas-liquid two-phase refrigerant, and the gas-liquid two-phase refrigerant is discharged from the condenser 4 and returns to the compressor 3 through the four-way reversing valve 9, and circulates in sequence. A condensing fan is provided at the condenser 4 to speed up the heat exchange efficiency of the condenser 4.

[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 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 inverter 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 electromagnetic three-way valve 10, the first electromagnetic two-way valve 11 and the second electromagnetic two-way valve 12 are selectively opened and closed, and the system functions are diversified, so that the system can select different working modes according to the ambient temperature to improve work efficiency.

[0037] In this embodiment, the first dry cooler 7 and the second dry cooler 8 are both air-water radiators, which can dissipate heat by using the temperature difference between the outlet water temperature and the inlet air temperature, thereby improving the convenience of installation and maintenance. Condensing fans are respectively provided at the first dry cooler 7 and the second dry cooler 8, further increasing the heat dissipation efficiency of the first dry cooler 7 and the second dry cooler 8.

[0038] The dual-liquid energy storage thermal management system includes working mode one, working mode two, working mode three and working mode four. 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 one; 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 two; 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 three; 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 four. 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, 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.

[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 working mode can realize the high-temperature refrigeration of the battery pack 1 and the high-temperature refrigeration process of the energy storage inverter 6, specifically: the coolant on the battery pack 1 side flows through the battery pack 1 and the heat exchanger 2 in sequence 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 in sequence to complete the cycle, and the low-temperature and low-pressure liquid refrigerant in the heat exchanger 2 absorbs the heat of the coolant to achieve the cooling of the battery pack 1, and the refrigeration circuit of the refrigerant improves the heat exchange efficiency of the battery pack 1 in an ultra-high temperature environment (ambient temperature T≥T). The coolant on the energy storage inverter 6 side flows through the first dry cooler 7 and the second dry cooler 8 respectively and then returns to the energy storage inverter 6 to complete the cycle, and the temperature difference between the coolant and the air in the first dry cooler 7 and the second dry cooler 8 is used to cool the energy storage inverter 6. Through the two dry coolers of the first dry cooler 7 and the second dry cooler 8, the cooling requirements of the energy storage inverter 6 in an ultra-high temperature environment are met.

[0043] Working mode 2 (when T2<T<T1): Figure 3 As shown, the compressor 3 is started, 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; 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 working mode can realize the mixed refrigeration of the battery pack 1 and the refrigeration process 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, and then merges and 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 in sequence to complete the cycle. Part of the heat of the battery pack 1 is absorbed by the low-temperature and low-pressure liquid refrigerant in the heat exchanger 2, and the other part of the heat is dissipated by the temperature difference between the coolant and the air in the first dry cooler 7. The refrigeration circuit of the refrigerant and the heat dissipation of the first dry cooler 7 are mixed refrigeration 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 inverter 6 side flows through the second dry cooler 8 and returns to the energy storage inverter 6 to complete the cycle. The temperature difference between the coolant and the air in the second dry cooler 8 is used to cool the energy storage inverter 6 to meet the cooling requirements of the energy storage inverter 6 in a high temperature environment.

[0046] Working mode 3 (when 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 refrigeration 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 realizing 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 realizing 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 opened.

[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 working mode can realize the heating process of the battery pack 1 and the cooling process 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 to complete the cycle; the refrigerant flows through the compressor 3, the four-way reversing valve 9, the heat exchanger 2, the throttling element 5 and the condenser 4 in sequence and returns to the compressor 3 to complete the cycle. The high-temperature and high-pressure gaseous refrigerant in the heat exchanger 2 releases the heat of the refrigerant to the coolant to achieve the heating of the battery pack 1, and the heating demand of the battery pack 1 at an ultra-low ambient temperature (ambient temperature T≤T3) is achieved through the heating cycle of the refrigerant. The coolant on the energy storage inverter 6 side flows through the first dry cooler 7 and the second dry cooler 8 respectively and then returns to the energy storage inverter 6 to complete the cycle, and the temperature difference between the coolant and the air in the first dry cooler 7 and the second dry cooler 8 is used to cool the energy storage inverter 6 to achieve the cooling demand of the energy storage inverter 6 in an ultra-low temperature environment.

[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 end 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 clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope 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 connected to 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 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), and 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); 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 respectively 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 respectively 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 respectively 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 respectively connected to the coolant outlet of the second dry cooler (7) and the coolant outlet of the one-way valve (13), the coolant outlet of the energy storage converter (6) is respectively connected to the coolant outlet of the second dry cooler (7) and the coolant outlet of the one-way valve (13). 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 connected to each other; the first interface of the first electromagnetic two-way valve (11) and the second interface of the first electromagnetic two-way valve (11) are connected; 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 connected.

2. The dual-liquid energy storage thermal management system according to claim 1 is 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 is 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 comprises 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), wherein the second water pump (15) is located at a 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).

Images