Double-liquid cold and heat management system

Abstract

The invention belongs to the technical field of energy storage heat management, and discloses a double-liquid cold and heat management system. The double-liquid cold and heat management system comprises a battery pack, a first heat exchanger, a second heat exchanger, a compressor, a throttling element, a multi-way valve assembly, an energy storage converter, a first dry cooler and a second dry cooler, wherein a first condensation fan and a second condensation fan are arranged at the first dry cooler and the second dry cooler respectively. Wherein the compressor is selectively started, and the multi-way valve assembly comprises a first electromagnetic four-way valve, a first electromagnetic three-way valve, a first electromagnetic two-way valve, a second electromagnetic four-way valve, a second electromagnetic three-way valve and a second electromagnetic two-way valve. The double-liquid cold and heat management system can meet the cooling requirement of the energy storage converter and the heating and cooling requirements of the energy storage battery pack at the same time, and is high in system integration degree and 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 cooling 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. The traditional air-cooled battery thermal management system has low cooling efficiency and poor temperature uniformity, which makes it difficult to meet the cooling requirements under large charge and discharge rates, and consumes a lot of energy. When the battery needs to be heated, electric heating is used to heat the battery, and the energy utilization rate is low. Therefore, the air-cooled battery thermal management system is difficult to adapt to the requirements of increasing energy storage scale and higher energy conversion rate. Liquid cooling technology has gradually replaced air cooling technology to become the mainstream solution for energy storage thermal management systems. In the energy storage converter system, a large amount of heat is generated during the operation of the energy storage converter. On the one hand, under low temperature conditions, its heat is wasted and cannot be used; on the other hand, the cooling of the energy storage converter usually requires a separate radiator and heat dissipation circuit inside the energy storage converter to form an energy storage converter cooling system, and the energy storage converter cooling system is generally independent of the battery thermal management cooling system. The entire energy storage thermal management system has low integration and low efficiency.

[0004] Therefore, it is urgent to propose a dual liquid cooling 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 cooling and heat management system, which can simultaneously meet the cooling requirements of the energy storage inverter and the heating and cooling requirements of the energy storage battery pack, and has high system integration and high working efficiency.

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

[0007] A dual liquid cooling thermal management system includes a battery pack, a first heat exchanger, a second heat exchanger, a compressor, a throttling element, a multi-way valve assembly, an energy storage converter, a first dry cooler and a second dry cooler, wherein the first dry cooler and the second dry cooler are respectively provided with a first condensing fan and a second condensing fan, wherein:

[0008] The compressor is selectively started, the refrigerant outlet of the compressor is communicated with the refrigerant inlet of the first heat exchanger, the refrigerant outlet of the first heat exchanger is communicated with the refrigerant inlet of the throttling element, the refrigerant outlet of the throttling element is communicated with the refrigerant inlet of the second heat exchanger, and the refrigerant outlet of the second heat exchanger is communicated with the refrigerant inlet of the compressor;

[0009] The multi-way valve assembly includes a first electromagnetic four-way valve, a first electromagnetic three-way valve, a first electromagnetic two-way valve, a second electromagnetic four-way valve, a second electromagnetic three-way valve and a second electromagnetic two-way valve. The coolant outlet of the battery pack is respectively communicated with the coolant inlet of the second heat exchanger and the first interface of the first electromagnetic four-way valve. The coolant inlet of the battery pack is respectively communicated with the coolant outlet of the second heat exchanger and the first interface of the second electromagnetic four-way valve. The coolant inlet and outlet of the energy storage converter are respectively communicated with the second interface of the first electromagnetic three-way valve and the second interface of the second electromagnetic three-way valve. The coolant inlet and outlet of the first heat exchanger are respectively communicated with the coolant inlet and outlet of the first electromagnetic The fourth interface of the magnetic four-way valve is communicated with the fourth interface of the second electromagnetic four-way valve, the coolant inlet of the first dry cooler is communicated with the third interface of the first electromagnetic three-way valve and the second interface of the first electromagnetic two-way valve respectively, the coolant outlet of the first dry cooler is communicated with the third interface of the second electromagnetic three-way valve and the second interface of the second electromagnetic two-way valve respectively, the coolant inlet of the second dry cooler is communicated with the third interface of the first electromagnetic four-way valve and the first interface of the first electromagnetic two-way valve respectively, and the coolant outlet of the second dry cooler is communicated with the third interface of the second electromagnetic four-way valve and the first interface of the second electromagnetic two-way valve respectively;

[0010] In the first electromagnetic four-way valve, the first interface of the first electromagnetic four-way valve, the second interface of the first electromagnetic four-way valve, the third interface of the first electromagnetic four-way valve and the fourth interface of the first electromagnetic four-way valve can be selectively connected to each other. In the second electromagnetic four-way valve, the first interface of the second electromagnetic four-way valve, the second interface of the second electromagnetic four-way valve, the third interface of the second electromagnetic four-way valve and the fourth interface of the second electromagnetic four-way valve can be selectively connected to each other. In the first electromagnetic three-way valve, the first interface of the first electromagnetic three-way valve, the second interface of the first electromagnetic three-way valve and the third interface of the first electromagnetic three-way valve can be selectively connected to each other. In the second electromagnetic three-way valve, the first interface of the second electromagnetic three-way valve, the second interface of the second electromagnetic three-way valve and the third interface of the second electromagnetic three-way valve can be selectively connected to each other. The first interface of the first electromagnetic two-way valve and the second interface of the first electromagnetic two-way valve can be selectively connected, and the first interface of the second electromagnetic two-way valve and the second interface of the second electromagnetic two-way valve can be selectively connected.

[0011] As an optional technical solution for the dual liquid cooling thermal management system, the compressor is not started; in the first solenoid four-way valve, only the first interface of the first solenoid four-way valve and the second interface of the first solenoid four-way valve are connected; in the second solenoid four-way valve, only the first interface of the second solenoid four-way valve and the second interface of the second solenoid four-way valve are connected; in the first solenoid three-way valve, only the first interface of the first solenoid three-way valve and the second interface of the first solenoid three-way valve are connected; in the second solenoid three-way valve, only the first interface of the second solenoid three-way valve and the second interface of the second solenoid three-way valve are connected.

[0012] As an optional technical solution for the dual liquid cooling thermal management system, the compressor is started; in the first solenoid four-way valve, only the first interface of the first solenoid four-way valve and the fourth interface of the first solenoid four-way valve are connected; in the second solenoid four-way valve, only the first interface of the second solenoid four-way valve and the fourth interface of the second solenoid four-way valve are connected; in the first solenoid three-way valve, only the second interface of the first solenoid three-way valve and the third interface of the first solenoid three-way valve are connected; in the second solenoid three-way valve, only the second interface of the second solenoid three-way valve and the third interface of the second solenoid three-way valve are connected; the first interface of the first solenoid two-way valve and the second interface of the first solenoid two-way valve are connected.

[0013] As an optional technical solution for the dual liquid cooling thermal management system, the compressor is started; in the first solenoid four-way valve, only the second interface of the first solenoid four-way valve is connected to the fourth interface of the first solenoid four-way valve; in the second solenoid four-way valve, only the second interface of the second solenoid four-way valve is connected to the fourth interface of the second solenoid four-way valve; in the first solenoid three-way valve, the first interface of the first solenoid three-way valve, the second interface of the first solenoid three-way valve and the third interface of the first solenoid three-way valve are all connected to each other; in the second solenoid three-way valve, the first interface of the second solenoid three-way valve, the second interface of the second solenoid three-way valve and the third interface of the second solenoid three-way valve are all connected to each other; the first interface of the first solenoid two-way valve is connected to the second interface of the first solenoid two-way valve; the first interface of the second solenoid two-way valve is connected to the second interface of the second solenoid two-way valve.

[0014] As an optional technical solution for a dual liquid cooling thermal management system, the compressor is started; in the first solenoid four-way valve, only the first interface of the first solenoid four-way valve, the third interface of the first solenoid four-way valve and the fourth interface of the first solenoid four-way valve are interconnected; in the second solenoid four-way valve, only the first interface of the second solenoid four-way valve, the third interface of the second solenoid four-way valve and the fourth interface of the second solenoid four-way valve are interconnected; in the first solenoid three-way valve, only the second interface of the first solenoid three-way valve and the third interface of the first solenoid three-way valve are connected; in the second solenoid three-way valve, only the second interface of the second solenoid three-way valve and the third interface of the second solenoid three-way valve are connected; the first interface of the first solenoid two-way valve and the second interface of the first solenoid two-way valve are not connected; the first interface of the second solenoid two-way valve and the second interface of the second solenoid two-way valve are not connected.

[0015] As an optional technical solution for the dual liquid cooling thermal management system, the compressor is not started; in the first solenoid four-way valve, only the first interface of the first solenoid four-way valve and the third interface of the first solenoid four-way valve are connected; in the second solenoid four-way valve, only the first interface of the second solenoid four-way valve and the third interface of the second solenoid four-way valve are connected; in the first solenoid three-way valve, only the second interface of the first solenoid three-way valve and the third interface of the first solenoid three-way valve are connected; in the second solenoid three-way valve, only the second interface of the second solenoid three-way valve and the third interface of the second solenoid three-way valve are connected; the first interface of the first solenoid two-way valve and the second interface of the first solenoid two-way valve are not connected; the first interface of the second solenoid two-way valve and the second interface of the second solenoid two-way valve are not connected.

[0016] As an optional technical solution of a dual-liquid cooling and heat management system, the dual-liquid cooling and heat management system also includes a first water pump and a second water pump, the coolant inlet of the first water pump is connected to the coolant outlet of the battery pack, and the coolant outlet of the first water pump is respectively connected to the coolant inlet of the second heat exchanger and the first interface of the first electromagnetic four-way valve; the coolant inlet of the second water pump is connected to the third interface of the first electromagnetic three-way valve, and the coolant outlet of the second water pump is respectively connected to the coolant inlet of the first dry cooler and the second interface of the first electromagnetic two-way valve.

[0017] As an optional technical solution for a dual liquid cooling thermal management system, the dual liquid cooling thermal management system also includes a first expansion tank and a second expansion tank, the first expansion tank is respectively connected to the battery pack and the first water pump, and the second expansion tank is respectively connected to the second water pump and the third interface of the first electromagnetic three-way valve.

[0018] As an optional technical solution for a dual-liquid cooling and thermal management system, the dual-liquid cooling and thermal management system also includes a PTC liquid heater, the coolant outlet of the PTC liquid heater is connected to the coolant inlet of the battery pack, and the coolant inlet of the PTC liquid heater is respectively connected to the coolant outlet of the second heat exchanger and the first interface of the second electromagnetic four-way valve.

[0019] As an optional technical solution for the dual liquid cooling thermal management system, the first solenoid four-way valve and the second solenoid four-way valve are both solenoid four-way water valves; the first solenoid three-way valve and the second solenoid three-way valve are both solenoid three-way water valves; the first solenoid two-way valve and the second solenoid two-way valve are both solenoid two-way water valves.

[0020] Beneficial effects of the present invention:

[0021] The dual liquid cooling thermal management system provided by the present invention includes a battery pack, a first heat exchanger, a second heat exchanger, a compressor, a throttling element, a multi-way valve assembly, an energy storage inverter, a first dry cooler and a second dry cooler. The first dry cooler and the second dry cooler are respectively provided with a first condensing fan and a second condensing fan, so that 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 multi-way valve assembly includes a first electromagnetic four-way valve, a first electromagnetic three-way valve, a first electromagnetic two-way valve, a second electromagnetic four-way valve, a second electromagnetic three-way valve and a second electromagnetic two-way valve. On the one hand, the energy storage inverter cooling system and the battery pack thermal management system are integrated through the multi-way valve assembly, and the refrigerant and coolant double liquid circulation are used to simultaneously meet the cooling requirements of the energy storage inverter and the heating and cooling requirements of the energy storage battery pack, and the system has a high degree of integration. On the other hand, the compressor is selectively started and the various valve interfaces in the multi-way valve assembly are selectively connected to change the coolant circulation loop to achieve switching of different working modes of the dual-liquid cooling thermal management system. Specifically, the waste heat recovery of the energy storage inverter can be used to heat the energy storage battery pack, and the battery pack can be used to cool the energy storage inverter, so as to achieve energy saving and consumption reduction, and reduce the operating cost and number of parts of the thermal management system; the energy storage inverter can also be cooled by a dry cooler, and the battery pack can be cooled by a compressor mechanical cooling method, a dry cooler cooling method, or a combination of a dry cooler and a compressor mechanical refrigeration method, thereby improving the comprehensive energy efficiency ratio of the battery pack cooling; the compressor mechanical heating can also be selected to heat the battery pack to improve the heating efficiency, thereby improving the working efficiency of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a dual liquid cooling thermal management system provided by an embodiment of the present invention;

[0023] Figure 2is a schematic diagram of working mode 1 of a dual liquid cooling thermal management system provided by an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of working mode 2 of a dual liquid cooling thermal management system provided by an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of working mode 3 of a dual liquid cooling thermal management system provided by an embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of working mode 4 of a dual liquid cooling thermal management system provided by an embodiment of the present invention;

[0027] Figure 6 It is a schematic diagram of working mode 5 of the dual liquid cooling thermal management system provided by an embodiment of the present invention.

[0028] In the figure:

[0029] 100, compressor; 210, first heat exchanger; 220, second heat exchanger; 300, throttling element; 411, first electromagnetic four-way valve; 412, second electromagnetic four-way valve; 421, first electromagnetic three-way valve; 422, second electromagnetic three-way valve; 431, first electromagnetic two-way valve; 432, second electromagnetic two-way valve; 500, battery pack; 600, energy storage inverter; 710, first dry cooler; 711, first condensing fan; 720, second dry cooler; 721, second condensing fan; 810, first water pump; 820, second water pump; 830, first expansion tank; 840, second expansion tank; 900, PTC liquid heater. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] The dual liquid cooling thermal management system provided in this embodiment can simultaneously meet the cooling requirements of the energy storage inverter 600 and the heating and cooling requirements of the energy storage battery pack 500, and has high system integration and high working efficiency.

[0035] Specifically, Figure 1 As shown, the dual liquid cooling thermal management system includes a battery pack 500, a first heat exchanger 210, a second heat exchanger 220, a compressor 100, a throttling element 300, a multi-way valve assembly, an energy storage converter 600, a first dry cooler 710 and a second dry cooler 720, wherein the first dry cooler 710 and the second dry cooler 720 are respectively provided with a first condensing fan 711 and a second condensing fan 721. The compressor 100 is selectively started, the refrigerant outlet of the compressor 100 is connected to the refrigerant inlet of the first heat exchanger 210, the refrigerant outlet of the first heat exchanger 210 is connected to the refrigerant inlet of the throttling element 300, the refrigerant outlet of the throttling element 300 is connected to the refrigerant inlet of the second heat exchanger 220, and the refrigerant outlet of the second heat exchanger 220 is connected to the refrigerant inlet of the compressor 100.

[0036] The multi-way valve assembly includes a first electromagnetic four-way valve 411, a first electromagnetic three-way valve 421, a first electromagnetic two-way valve 431, a second electromagnetic four-way valve 412, a second electromagnetic three-way valve 422, and a second electromagnetic two-way valve 432. The coolant outlet of the battery pack 500 is respectively connected to the coolant inlet of the second heat exchanger 220 and the first interface of the first electromagnetic four-way valve 411; the coolant inlet of the battery pack 500 is respectively connected to the coolant outlet of the second heat exchanger 220 and the first interface of the second electromagnetic four-way valve 412. The coolant inlet and outlet of the energy storage converter 600 are respectively connected to the second interface of the first electromagnetic three-way valve 421 and the second interface of the second electromagnetic three-way valve 422. The coolant inlet and outlet of the first heat exchanger 210 are respectively connected to the fourth interface of the first electromagnetic four-way valve 411 and the fourth interface of the second electromagnetic four-way valve 412. The coolant inlet of the first dry cooler 710 is respectively connected to the third interface of the first electromagnetic three-way valve 421 and the second interface of the first electromagnetic two-way valve 431; the coolant outlet of the first dry cooler 710 is respectively connected to the third interface of the second electromagnetic three-way valve 422 and the second interface of the second electromagnetic two-way valve 432. The coolant inlet of the second dry cooler is respectively connected to the third interface of the first electromagnetic four-way valve 411 and the first interface of the first electromagnetic two-way valve 431; the coolant outlet of the second dry cooler is respectively connected to the third interface of the second electromagnetic four-way valve 412 and the first interface of the second electromagnetic two-way valve 432.

[0037] In the first electromagnetic four-way valve 411, the first interface of the first electromagnetic four-way valve 411, the second interface of the first electromagnetic four-way valve 411, the third interface of the first electromagnetic four-way valve 411, and the fourth interface of the first electromagnetic four-way valve 411 can be selectively connected to each other. In the second electromagnetic four-way valve 412, the first interface of the second electromagnetic four-way valve 412, the second interface of the second electromagnetic four-way valve 412, the third interface of the second electromagnetic four-way valve 412, and the fourth interface of the second electromagnetic four-way valve 412 can be selectively connected to each other. In the first electromagnetic three-way valve 421, the first interface of the first electromagnetic three-way valve 421, the second interface of the first electromagnetic three-way valve 421, and the third interface of the first electromagnetic three-way valve 421 can be selectively connected to each other. In the second electromagnetic three-way valve 422, the first interface of the second electromagnetic three-way valve 422, the second interface of the second electromagnetic three-way valve 422, and the third interface of the second electromagnetic three-way valve 422 can be selectively connected to each other. The first interface of the first electromagnetic two-way valve 431 and the second interface of the first electromagnetic two-way valve 431 can be selectively communicated. The first interface of the second electromagnetic two-way valve 432 and the second interface of the second electromagnetic two-way valve 432 can be selectively communicated.

[0038] Based on the above design, the first dry cooler 710 and the second dry cooler 720 are respectively provided with a first condensing fan 711 and a second condensing fan 721, so that the first dry cooler 710 and the second dry cooler 720 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 710 and the second dry cooler 720. The refrigerant outlet of the compressor 100 is connected to the refrigerant inlet of the first heat exchanger 210, the refrigerant outlet of the first heat exchanger 210 is connected to the refrigerant inlet of the throttling element 300, the refrigerant outlet of the throttling element 300 is connected to the refrigerant inlet of the second heat exchanger 220, and the refrigerant outlet of the second heat exchanger 220 is connected to the refrigerant inlet of the compressor 100, forming a refrigerant circulation loop (dashed box in the figure). The compressor 100 is started, and the refrigerant enters the compressor 100 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 100 and enters the first heat exchanger 210, 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 300, 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 second heat exchanger 220, 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 second heat exchanger 220 and returns to the compressor 100, and circulates in sequence. The multi-way valve assembly includes a first electromagnetic four-way valve 411, a first electromagnetic three-way valve 421, a first electromagnetic two-way valve 431, a second electromagnetic four-way valve 412, a second electromagnetic three-way valve 422, and a second electromagnetic two-way valve 432. The coolant outlet of the battery pack 500 is respectively connected to the coolant inlet of the second heat exchanger 220 and the first interface of the first electromagnetic four-way valve 411; the coolant inlet of the battery pack 500 is respectively connected to the coolant outlet of the second heat exchanger 220 and the first interface of the second electromagnetic four-way valve 412. The coolant inlet and outlet of the energy storage converter 600 are respectively connected to the second interface of the first electromagnetic three-way valve 421 and the second interface of the second electromagnetic three-way valve 422. The coolant inlet and outlet of the first heat exchanger 210 are respectively connected to the fourth interface of the first electromagnetic four-way valve 411 and the fourth interface of the second electromagnetic four-way valve 412. The coolant inlet of the first dry cooler 710 is respectively connected to the third interface of the first electromagnetic three-way valve 421 and the second interface of the first electromagnetic two-way valve 431; the coolant outlet of the first dry cooler 710 is respectively connected to the third interface of the second electromagnetic three-way valve 422 and the second interface of the second electromagnetic two-way valve 432. The coolant inlet of the second dryer is respectively connected to the third interface of the first electromagnetic four-way valve 411 and the first interface of the first electromagnetic two-way valve 431; the coolant outlet of the second dryer is respectively connected to the third interface of the second electromagnetic four-way valve 412 and the first interface of the second electromagnetic two-way valve 432. The above circuits form the coolant circuits of the battery pack 500 and the energy storage converter 600 (solid line boxes in the figure).On the one hand, the cooling system of the energy storage inverter 600 and the thermal management system of the battery pack 500 are integrated through a multi-way valve assembly, and the dual liquid circulation of refrigerant and coolant is utilized to simultaneously meet the cooling requirements of the energy storage inverter 600 and the heating and cooling requirements of the energy storage battery pack 500, and the system has a high degree of integration. On the other hand, the compressor 100 is selectively started and the various valve interfaces in the multi-way valve assembly are selectively connected to change the coolant circulation loop to realize the switching of different working modes of the dual-liquid cooling thermal management system. Specifically, the waste heat of the energy storage inverter 600 can be selected to be recovered to heat the energy storage battery pack 500, and the battery pack 500 can be used to cool the energy storage inverter 600, so as to achieve the purpose of energy saving and consumption reduction, and reduce the operating cost and the number of parts of the thermal management system; the energy storage inverter 600 can also be selected to be cooled by a dry cooler, and the battery pack 500 can be cooled by a mechanical cooling method of the compressor 100, a cooling method of the dry cooler, or a cooling method of a combination of the mechanical cooling method of the dry cooler and the compressor 100, thereby improving the comprehensive energy efficiency ratio of the cooling of the battery pack 500; the compressor 100 can also be selected to mechanically heat the battery pack 500 to improve the heating efficiency, thereby improving the working efficiency of the entire system.

[0039] In this embodiment, the first dry cooler 710 and the second dry cooler 720 are both air-to-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.

[0040] In addition, the first dry cooler 710 and the first condensing fan 711, the second dry cooler 720 and the second condensing fan 721 and other heat dissipation units are all placed on the top of the dual liquid cooling thermal management system container to save installation space in the container.

[0041] In this embodiment, the first solenoid four-way valve 411 and the second solenoid four-way valve 412 are both solenoid four-way water valves; the first solenoid three-way valve 421 and the second solenoid three-way valve 422 are both solenoid three-way water valves; the first solenoid two-way valve 431 and the second solenoid two-way valve 432 are both solenoid two-way water valves.

[0042] Specifically, the compressor 100 is selectively started, and the interfaces of the first solenoid four-way valve 411, the first solenoid three-way valve 421, the first solenoid two-way valve 431, the second solenoid four-way valve 412, the second solenoid three-way valve 422 and the second solenoid two-way valve 432 are selectively connected, thereby forming five working modes of the dual liquid cooling thermal management system.

[0043] Working mode 1: Figure 2As shown, the compressor 100 is not started; in the first solenoid four-way valve 411, only the first interface of the first solenoid four-way valve 411 and the second interface of the first solenoid four-way valve 411 are connected; in the second solenoid four-way valve 412, only the first interface of the second solenoid four-way valve 412 and the second interface of the second solenoid four-way valve 412 are connected; in the first solenoid three-way valve 421, only the first interface of the first solenoid three-way valve 421 and the second interface of the first solenoid three-way valve 421 are connected; in the second solenoid three-way valve 422, only the first interface of the second solenoid three-way valve 422 and the second interface of the second solenoid three-way valve 422 are connected.

[0044] Figure 2 The direction of the solid arrow is the flow direction of the coolant.

[0045] The cooling process of the energy storage inverter 600 and the heating process of the battery pack 500 is realized. Specifically, the coolant flowing out of the battery pack 500 is divided into two parts. One part of the coolant flows through the first electromagnetic four-way valve 411 (the first interface and the second interface of the first electromagnetic four-way valve 411), the first electromagnetic three-way valve 421 (the first interface and the second interface of the first electromagnetic three-way valve 421), the energy storage inverter 600, the second electromagnetic three-way valve 422 (the second interface and the first interface of the second electromagnetic three-way valve 422), and the second electromagnetic four-way valve 412 (the second interface and the first interface of the second electromagnetic four-way valve 412); the other part of the coolant flows into the second heat exchanger 220; finally, the coolant coming out of the second heat exchanger 220 merges with the coolant coming out of the second electromagnetic four-way valve 412 and enters the battery pack 500 to complete the cycle, so as to achieve the purpose of heating the battery pack 500 by using the heat of the energy storage inverter 600 (recovering the heat of the energy storage inverter 600 for cooling) in a relatively low temperature environment (when the battery pack 500 needs to be heated to a uniform temperature).

[0046] Working mode 2: Figure 3 As shown, the compressor 100 is started; in the first solenoid four-way valve 411, only the first interface of the first solenoid four-way valve 411 and the fourth interface of the first solenoid four-way valve 411 are connected; in the second solenoid four-way valve 412, only the first interface of the second solenoid four-way valve 412 and the fourth interface of the second solenoid four-way valve 412 are connected; in the first solenoid three-way valve 421, only the second interface of the first solenoid three-way valve 421 and the third interface of the first solenoid three-way valve 421 are connected; in the second solenoid three-way valve 422, only the second interface of the second solenoid three-way valve 422 and the third interface of the second solenoid three-way valve 422 are connected; the first interface of the first solenoid two-way valve 431 and the second interface of the first solenoid two-way valve 431 are connected.

[0047] Figure 3 The direction of the solid arrow is the flow direction of the coolant, and the direction of the dotted arrow is the flow direction of the refrigerant.

[0048] The cooling process of the energy storage inverter 600 and the heating process of the battery pack 500 are realized. Specifically, the cooling of the energy storage inverter 600 is that the coolant flows through the energy storage inverter 600, the first electromagnetic three-way valve 421 (the second interface and the third interface of the first electromagnetic three-way valve 421), the first dry cooler 710 and the second dry cooler 720 (the first dry cooler 710 and the second dry cooler 720 are connected in parallel through the first electromagnetic two-way valve 431 and the second electromagnetic two-way valve 432), the second electromagnetic three-way valve 422 (the third interface and the second interface of the second electromagnetic three-way valve 422) and then to the energy storage inverter 600 to complete the cycle, and the temperature difference between the outlet water temperature and the inlet air temperature of the first dry cooler 710 and the second dry cooler 720 is used to dissipate heat. The two dry coolers dissipate heat, and the heat exchange efficiency is high. The heating of the battery pack 500 is that the refrigerant circulates in the compressor 100, the first heat exchanger 210, the throttling element 300 and the second heat exchanger 220 in sequence; at the same time, the coolant coming out of the battery pack 500 is divided into two parts, one part of the coolant flows through the first electromagnetic four-way valve 411 (the first interface and the fourth interface of the first electromagnetic four-way valve 411 are connected), the first heat exchanger 210, and the second electromagnetic four-way valve 412 (the fourth interface and the first interface of the second electromagnetic four-way valve 412 are connected) in sequence, and the other part of the coolant enters the second heat exchanger 220, flows out of the second heat exchanger 220 and then merges with the coolant flowing out of the second electromagnetic four-way valve 412, and then enters the battery pack 500 to complete the cycle, and the high-temperature and high-pressure refrigerant discharged from the compressor 100 into the first heat exchanger 210 is used to heat the coolant, and the heated coolant then heats the battery pack 500, and mechanical heating is used to heat the battery pack 500, with high heat exchange efficiency.

[0049] Working mode 3: Figure 4 As shown, the compressor 100 is started; in the first electromagnetic four-way valve 411, only the second interface of the first electromagnetic four-way valve 411 and the fourth interface of the first electromagnetic four-way valve 411 are connected; in the second electromagnetic four-way valve 412, only the second interface of the second electromagnetic four-way valve 412 and the fourth interface of the second electromagnetic four-way valve 412 are connected; in the first electromagnetic three-way valve 421, the first interface of the first electromagnetic three-way valve 421, the second interface of the first electromagnetic three-way valve 421 and the third interface of the first electromagnetic three-way valve 421 are all connected to each other; in the second electromagnetic three-way valve 422, the first interface of the second electromagnetic three-way valve 422, the second interface of the second electromagnetic three-way valve 422 and the third interface of the second electromagnetic three-way valve 422 are all connected to each other; the first interface of the first electromagnetic two-way valve 431 and the second interface of the first electromagnetic two-way valve 431 are connected; the first interface of the second electromagnetic two-way valve 432 and the second interface of the second electromagnetic two-way valve 432 are connected.

[0050] Figure 4 The direction of the solid arrow is the flow direction of the coolant, and the direction of the dotted arrow is the flow direction of the refrigerant.

[0051] The cooling process of the energy storage inverter 600 and the battery pack 500 is realized. Specifically, the cooling of the battery pack 500 is that the refrigerant circulates in the compressor 100, the first heat exchanger 210, the throttling element 300 and the second heat exchanger 220 in sequence; at the same time, the coolant from the battery pack 500 returns to the battery pack 500 after heat exchange with the refrigerant through the second heat exchanger 220 to complete the cycle, and the low-temperature and low-pressure refrigerant after passing through the throttling element 300 absorbs the heat of the coolant to achieve the purpose of cooling the battery pack 500. In a high temperature environment, the battery pack 500 is mechanically cooled. When the energy storage converter 600 is used for cooling, the coolant flowing out of the first heat exchanger 210 through the first electromagnetic four-way valve 411 (the second interface and the fourth interface of the first electromagnetic four-way valve 411) and the coolant flowing out of the energy storage converter 600 are combined through the first electromagnetic three-way valve 421, and then enter the first dry cooler 710 and the second dry cooler 720 (the first dry cooler 710 and the second dry cooler 720 are connected in parallel through the first electromagnetic two-way valve 431 and the second electromagnetic two-way valve 432). The coolant cooled from the first dry cooler 710 and the second dry cooler 720 enters the second electromagnetic three-way valve 421. Valve 422, in the second electromagnetic three-way valve 422, a part of the coolant returns to the energy storage inverter 600 through the second interface of the second electromagnetic three-way valve 422, and the other part of the coolant returns to the first heat exchanger 210 through the second electromagnetic four-way valve 412, completing the cycle, so that the heat of the energy storage inverter 600 and the heat of the refrigerant in the first heat exchanger 210 are cooled through the first dry cooler 710 and the second dry cooler 720, that is, the temperature difference between the outlet water temperature and the inlet air temperature of the first dry cooler 710 and the second dry cooler 720 is used to dissipate heat, and the heat exchange efficiency is high.

[0052] It should be noted that, usually when the ambient temperature T is higher than the first set temperature T1, the dual liquid cooling thermal management system adopts the above-mentioned working mode 3. Usually, the value of the first set temperature T1 is greater than or equal to 15 degrees Celsius. Exemplarily, the value of the first set temperature T1 is 15 degrees Celsius, 18 degrees Celsius, 19 degrees Celsius, etc.

[0053] Working mode 4: Figure 5As shown, the compressor 100 is started; in the first electromagnetic four-way valve 411, only the first interface of the first electromagnetic four-way valve 411, the third interface of the first electromagnetic four-way valve 411 and the fourth interface of the first electromagnetic four-way valve 411 are interconnected; in the second electromagnetic four-way valve 412, only the first interface of the second electromagnetic four-way valve 412, the third interface of the second electromagnetic four-way valve 412 and the fourth interface of the second electromagnetic four-way valve 412 are interconnected; in the first electromagnetic three-way valve 421, only the second interface of the first electromagnetic three-way valve 421 and the third interface of the first electromagnetic three-way valve 421 are connected; in the second electromagnetic three-way valve 422, only the second interface of the second electromagnetic three-way valve 422 and the third interface of the second electromagnetic three-way valve 422 are connected; the first interface of the first electromagnetic two-way valve 431 and the second interface of the first electromagnetic two-way valve 431 are not connected; the first interface of the second electromagnetic two-way valve 432 and the second interface of the second electromagnetic two-way valve 432 are not connected.

[0054] Figure 5 The direction of the solid arrow is the flow direction of the coolant, and the direction of the dotted arrow is the flow direction of the refrigerant.

[0055] The energy storage inverter 600 refrigeration and the battery pack 500 mixed refrigeration process are realized. The energy storage inverter 600 refrigeration is: the coolant flows through the first dry cooler 710, the second electromagnetic three-way valve 422 (the third interface and the second interface of the second electromagnetic three-way valve 422), the energy storage inverter 600 and the first electromagnetic three-way valve 421 (the second interface and the third interface of the first electromagnetic three-way valve 421) in sequence, and then returns to the first dry cooler 710 to complete the cycle, and the temperature difference between the outlet water temperature and the inlet air temperature of a dry cooler of the first dry cooler 710 is used to dissipate heat. The battery pack 500 is cooled as follows: the refrigerant circulates in the compressor 100, the first heat exchanger 210, the throttling element 300 and the second heat exchanger 220 in sequence; at the same time, the coolant from the battery pack 500 is first divided into two parts, one part of the coolant enters the second heat exchanger 220, and is cooled by heat exchange in the second heat exchanger 220, and the other part of the coolant enters the first electromagnetic four-way valve 411, and the coolant is further divided into two paths in the first electromagnetic four-way valve 411, one part enters the second dry cooler 720 through the third interface of the first electromagnetic four-way valve 411 for cooling, and then enters the second electromagnetic four-way valve 41 2, and the other path passes through the fourth interface of the first electromagnetic four-way valve 411 and the first heat exchanger 210 in sequence and then enters the second electromagnetic four-way valve 412. The two paths of coolant finally merge at the second electromagnetic four-way valve 412 and flow out to merge with the coolant coming out of the second heat exchanger 220 and enter the battery pack 500 to complete the cycle, so that part of the heat of the battery pack 500 is dissipated through the second dry cooler 720, and the rest of the heat is transferred to the refrigerant through the second heat exchanger 220. The refrigerant transfers the heat to the coolant through the first heat exchanger 210, and finally reaches the purpose of complete cooling through the second dry cooler 720.

[0056] It should be noted that, usually when the ambient temperature T is less than or equal to the first set temperature T1 and greater than the second set temperature T2, the first set temperature is greater than the second set temperature, and the dual liquid cooling thermal management system selects the above-mentioned working mode 4. Usually, the value of the second set temperature T2 is less than or equal to 5 degrees Celsius. Exemplarily, the value of the second set temperature T2 can be 5 degrees Celsius, 4 degrees Celsius, 2 degrees Celsius, 1 degree Celsius, etc. Working mode five: the compressor 100 is not started; in the first solenoid four-way valve 411, only the first interface of the first solenoid four-way valve 411 and the third interface of the first solenoid four-way valve 411 are connected; in the second solenoid four-way valve 412, only the first interface of the second solenoid four-way valve 412 and the third interface of the second solenoid four-way valve 412 are connected; in the first solenoid three-way valve 421, only the second interface of the first solenoid three-way valve 421 and the third interface of the first solenoid three-way valve 421 are connected; in the second solenoid three-way valve 422, only the second interface of the second solenoid three-way valve 422 and the third interface of the second solenoid three-way valve 422 are connected; the first interface of the first solenoid two-way valve 431 and the second interface of the first solenoid two-way valve 431 are not connected; the first interface of the second solenoid two-way valve 432 is not connected.

[0057] Figure 6 The direction of the solid arrow is the flow direction of the coolant.

[0058] To realize the refrigeration process of the energy storage inverter 600 and the low-temperature refrigeration process of the battery pack 500, the refrigeration of the energy storage inverter 600 is: the coolant flows through the first dry cooler 710, the second electromagnetic three-way valve 422 (the third interface and the second interface of the second electromagnetic three-way valve 422), the energy storage inverter 600 and the first electromagnetic three-way valve 421 (the second and third interfaces of the first electromagnetic three-way valve 421) in sequence, and then returns to the first dry cooler 710 to complete the cycle, and the temperature difference between the outlet water temperature and the inlet air temperature of the first dry cooler 710 is used to dissipate heat. The battery pack 500 is cooled as follows: a portion of the coolant from the battery pack 500 flows through the first electromagnetic four-way valve 411 (the first interface and the third interface of the first electromagnetic four-way valve 411), the second dry cooler 720, and the second electromagnetic four-way valve 412 (the third interface and the second interface of the second electromagnetic four-way valve 412) in sequence, and the other portion flows through the second heat exchanger 220. The coolant from the second electromagnetic four-way valve 412 merges with the coolant from the second heat exchanger 220 and enters the battery pack 500 to complete the cycle. Only the temperature difference between the outlet water temperature and the inlet air temperature of the second dry cooler 720 is used for heat dissipation, so as to realize the cooling of the battery pack 500 in a low temperature environment.

[0059] It should be noted that, usually when the ambient temperature T is less than or equal to the second set temperature T2, the dual liquid cooling thermal management system adopts the above-mentioned working mode five.

[0060] Continue as Figure 1 As shown, the dual liquid cooling thermal management system further includes a first water pump 810 and a second water pump 820. The coolant inlet of the first water pump 810 is connected to the coolant outlet of the battery pack 500, and the coolant outlet of the first water pump 810 is respectively connected to the coolant inlet of the second heat exchanger 220 and the first interface of the first electromagnetic four-way valve 411. The coolant inlet of the second water pump 820 is connected to the third interface of the first electromagnetic three-way valve 421, and the coolant outlet of the second water pump 820 is respectively connected to the coolant inlet of the first dry cooler 710 and the second interface of the first electromagnetic two-way valve 431. The first water pump 810 and the second water pump 820 are both used to increase the flow rate and flow rate of the coolant.

[0061] Furthermore, the dual liquid cooling thermal management system further includes a first expansion tank 830 and a second expansion tank 840. The first expansion tank 830 is respectively connected to the battery pack 500 and the first water pump 810, and the second expansion tank 840 is respectively connected to the second water pump 820 and the third interface of the first electromagnetic three-way valve 421. The first expansion tank 830 and the second expansion tank 840 are both used to stabilize the pressure of the coolant circuit system.

[0062] Continue as Figure 1 As shown, the dual liquid cooling thermal management system further includes a PTC liquid heater 900, the coolant outlet of the PTC liquid heater 900 is connected to the coolant inlet of the battery pack 500, and the coolant inlet of the PTC liquid heater 900 is respectively connected to the coolant outlet of the second heat exchanger 220 and the first interface of the second electromagnetic four-way valve 412. The PTC liquid heater 900 is used to heat the coolant to improve the heat exchange efficiency of the system.

[0063] 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. Dual liquid cooling thermal management system, characterized in that: The dual liquid cooling thermal management system comprises a battery pack (500), a first heat exchanger (210), a second heat exchanger (220), a compressor (100), a throttling element (300), a multi-way valve assembly, an energy storage converter (600), a first dry cooler (710) and a second dry cooler (720), wherein the first dry cooler (710) and the second dry cooler (720) are respectively provided with a first condensing fan (711) and a second condensing fan (721), wherein: The compressor (100) is selectively started, the refrigerant outlet of the compressor (100) is communicated with the refrigerant inlet of the first heat exchanger (210), the refrigerant outlet of the first heat exchanger (210) is communicated with the refrigerant inlet of the throttling element (300), the refrigerant outlet of the throttling element (300) is communicated with the refrigerant inlet of the second heat exchanger (220), and the refrigerant outlet of the second heat exchanger (220) is communicated with the refrigerant inlet of the compressor (100); The multi-way valve assembly comprises a first electromagnetic four-way valve (411), a first electromagnetic three-way valve (421), a first electromagnetic two-way valve (431), a second electromagnetic four-way valve (412), a second electromagnetic three-way valve (422) and a second electromagnetic two-way valve (432); the coolant outlet of the battery pack (500) is respectively communicated with the coolant inlet of the second heat exchanger (220) and the first interface of the first electromagnetic four-way valve (411); the coolant inlet of the battery pack (500) is respectively communicated with the coolant outlet of the second heat exchanger (220) and the first interface of the second electromagnetic four-way valve (412); the coolant inlet and outlet of the energy storage converter (600) are respectively communicated with the second interface of the first electromagnetic three-way valve (421) and the second interface of the second electromagnetic three-way valve (422); the coolant inlet and outlet of the first heat exchanger (210) are respectively communicated with the coolant inlet and outlet of the second heat exchanger (220) and the first interface of the second electromagnetic four-way valve (412); The outlets are respectively communicated with the fourth interface of the first electromagnetic four-way valve (411) and the fourth interface of the second electromagnetic four-way valve (412); the coolant inlet of the first dry cooler (710) is respectively communicated with the third interface of the first electromagnetic three-way valve (421) and the second interface of the first electromagnetic two-way valve (431); the coolant outlet of the first dry cooler (710) is respectively communicated with the third interface of the second electromagnetic three-way valve (422) and the second interface of the second electromagnetic two-way valve (432); the coolant inlet of the second dry cooler is respectively communicated with the third interface of the first electromagnetic four-way valve (411) and the first interface of the first electromagnetic two-way valve (431); the coolant outlet of the second dry cooler is respectively communicated with the third interface of the second electromagnetic four-way valve (412) and the first interface of the second electromagnetic two-way valve (432); In the first electromagnetic four-way valve (411), the first interface of the first electromagnetic four-way valve (411), the second interface of the first electromagnetic four-way valve (411), the third interface of the first electromagnetic four-way valve (411) and the fourth interface of the first electromagnetic four-way valve (411) can be selectively connected to each other. In the second electromagnetic four-way valve (412), the first interface of the second electromagnetic four-way valve (412), the second interface of the second electromagnetic four-way valve (412), the third interface of the second electromagnetic four-way valve (412) and the fourth interface of the second electromagnetic four-way valve (412) can be selectively connected to each other. In the first electromagnetic three-way valve (421), the first electromagnetic three-way valve (421) The first interface of the valve (421), the second interface of the first electromagnetic three-way valve (421) and the third interface of the first electromagnetic three-way valve (421) can be selectively connected to each other. In the second electromagnetic three-way valve (422), the first interface of the second electromagnetic three-way valve (422), the second interface of the second electromagnetic three-way valve (422) and the third interface of the second electromagnetic three-way valve (422) can be selectively connected to each other. The first interface of the first electromagnetic two-way valve (431) and the second interface of the first electromagnetic two-way valve (431) can be selectively connected, and the first interface of the second electromagnetic two-way valve (432) and the second interface of the second electromagnetic two-way valve (432) can be selectively connected.

2. The dual liquid cooling thermal management system according to claim 1, characterized in that: The compressor (100) is not started; in the first electromagnetic four-way valve (411), only the first interface of the first electromagnetic four-way valve (411) and the second interface of the first electromagnetic four-way valve (411) are connected; in the second electromagnetic four-way valve (412), only the first interface of the second electromagnetic four-way valve (412) and the second interface of the second electromagnetic four-way valve (412) are connected; in the first electromagnetic three-way valve (421), only the first interface of the first electromagnetic three-way valve (421) and the second interface of the first electromagnetic three-way valve (421) are connected; in the second electromagnetic three-way valve (422), only the first interface of the second electromagnetic three-way valve (422) and the second interface of the second electromagnetic three-way valve (422) are connected.

3. The dual liquid cooling thermal management system according to claim 1, characterized in that: The compressor (100) is started; in the first electromagnetic four-way valve (411), only the first interface of the first electromagnetic four-way valve (411) and the fourth interface of the first electromagnetic four-way valve (411) are in communication; in the second electromagnetic four-way valve (412), only the first interface of the second electromagnetic four-way valve (412) and the fourth interface of the second electromagnetic four-way valve (412) are in communication; in the first electromagnetic three-way valve (421), only the second interface of the first electromagnetic three-way valve (421) and the third interface of the first electromagnetic three-way valve (421) are in communication; in the second electromagnetic three-way valve (422), only the second interface of the second electromagnetic three-way valve (422) and the third interface of the second electromagnetic three-way valve (422) are in communication; and the first interface of the first electromagnetic two-way valve (431) and the second interface of the first electromagnetic two-way valve (431) are in communication.

4. The dual liquid cooling thermal management system according to claim 1, characterized in that: The compressor (100) is started; in the first electromagnetic four-way valve (411), only the second interface of the first electromagnetic four-way valve (411) and the fourth interface of the first electromagnetic four-way valve (411) are in communication; in the second electromagnetic four-way valve (412), only the second interface of the second electromagnetic four-way valve (412) and the fourth interface of the second electromagnetic four-way valve (412) are in communication; in the first electromagnetic three-way valve (421), the first interface of the first electromagnetic three-way valve (421), the second interface of the first electromagnetic three-way valve (421) and the fourth interface of the second electromagnetic four-way valve (412) are in communication The third interfaces of the first electromagnetic three-way valve (421) are interconnected; in the second electromagnetic three-way valve (422), the first interface of the second electromagnetic three-way valve (422), the second interface of the second electromagnetic three-way valve (422) and the third interface of the second electromagnetic three-way valve (422) are interconnected; the first interface of the first electromagnetic two-way valve (431) and the second interface of the first electromagnetic two-way valve (431) are interconnected; the first interface of the second electromagnetic two-way valve (432) and the second interface of the second electromagnetic two-way valve (432) are interconnected.

5. The dual liquid cooling thermal management system according to claim 1, characterized in that: The compressor (100) is started; in the first electromagnetic four-way valve (411), only the first interface of the first electromagnetic four-way valve (411), the third interface of the first electromagnetic four-way valve (411), and the fourth interface of the first electromagnetic four-way valve (411) are interconnected; in the second electromagnetic four-way valve (412), only the first interface of the second electromagnetic four-way valve (412), the third interface of the second electromagnetic four-way valve (412), and the fourth interface of the second electromagnetic four-way valve (412) are interconnected; in the first electromagnetic three-way valve (42 1), only the second interface of the first electromagnetic three-way valve (421) and the third interface of the first electromagnetic three-way valve (421) are connected; in the second electromagnetic three-way valve (422), only the second interface of the second electromagnetic three-way valve (422) and the third interface of the second electromagnetic three-way valve (422) are connected; the first interface of the first electromagnetic two-way valve (431) and the second interface of the first electromagnetic two-way valve (431) are not connected; the first interface of the second electromagnetic two-way valve (432) and the second interface of the second electromagnetic two-way valve (432) are not connected.

6. The dual liquid cooling thermal management system according to claim 1, characterized in that: The compressor (100) is not started; in the first electromagnetic four-way valve (411), only the first interface of the first electromagnetic four-way valve (411) and the third interface of the first electromagnetic four-way valve (411) are in communication; in the second electromagnetic four-way valve (412), only the first interface of the second electromagnetic four-way valve (412) and the third interface of the second electromagnetic four-way valve (412) are in communication; in the first electromagnetic three-way valve (421), only the second interface of the first electromagnetic three-way valve (421) and the third interface of the first electromagnetic three-way valve (421) are in communication; in the second electromagnetic three-way valve (422), only the second interface of the second electromagnetic three-way valve (422) and the third interface of the second electromagnetic three-way valve (422) are in communication; the first interface of the first electromagnetic two-way valve (431) and the second interface of the first electromagnetic two-way valve (431) are not in communication; the first interface of the second electromagnetic two-way valve (432) and the second interface of the second electromagnetic two-way valve (432) are not in communication.

7. The dual liquid cooling thermal management system according to claim 1, characterized in that: The dual liquid cooling thermal management system further comprises a first water pump (810) and a second water pump (820); the coolant inlet of the first water pump (810) is connected to the coolant outlet of the battery pack (500); the coolant outlet of the first water pump (810) is respectively connected to the coolant inlet of the second heat exchanger (220) and the first interface of the first electromagnetic four-way valve (411); the coolant inlet of the second water pump (820) is connected to the third interface of the first electromagnetic three-way valve (421); the coolant outlet of the second water pump (820) is respectively connected to the coolant inlet of the first dry cooler (710) and the second interface of the first electromagnetic two-way valve (431).

8. The dual liquid cooling thermal management system according to claim 7, characterized in that: The dual liquid cooling thermal management system further includes a first expansion tank (830) and a second expansion tank (840), wherein the first expansion tank (830) is respectively connected to the battery pack (500) and the first water pump (810), and the second expansion tank (840) is respectively connected to the second water pump (820) and the third interface of the first electromagnetic three-way valve (421).

9. The dual liquid cooling thermal management system according to claim 1, characterized in that: The dual liquid cooling thermal management system further comprises a PTC liquid heater (900), the coolant outlet of the PTC liquid heater (900) being connected to the coolant inlet of the battery pack (500), and the coolant inlet of the PTC liquid heater (900) being connected to the coolant outlet of the second heat exchanger (220) and the first interface of the second electromagnetic four-way valve (412), respectively.

10. The dual liquid cooling thermal management system according to claim 1, characterized in that: The first electromagnetic four-way valve (411) and the second electromagnetic four-way valve (412) are both electromagnetic four-way water valves; the first electromagnetic three-way valve (421) and the second electromagnetic three-way valve (422) are both electromagnetic three-way water valves; the first electromagnetic two-way valve (431) and the second electromagnetic two-way valve (432) are both electromagnetic two-way water valves.

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