Secondary heat exchange type heat pump type heat management system and heat management method

Abstract

The invention discloses a secondary heat exchange type heat pump type heat management system and a heat management method. The secondary heat exchange type heat pump type heat management system comprises a heat supply ventilation and air conditioning assembly, a multi-way valve with at least nine connectors, a cooling liquid loop connected to the nine different connectors and a refrigerant loop capable of conducting heat exchange with the cooling liquid loop. The cooling liquid loop comprises an electric drive loop, a heat dissipation loop, a battery loop, a coupling loop, a first heat exchange cooling liquid loop and a cold air core loop; cooling liquid can be guided into a battery pack of a battery loop and a cold air core loop according to a set proportion through the cooling liquid three-way valve. The refrigerant loop comprises a refrigerant pipeline, and the compressor, the first heat exchanger and the second heat exchanger are connected in series through the refrigerant pipeline. The multi-way valve can realize the circular flow of various cooling liquids by controlling the mutual communication or cut-off of the interfaces, and control and switching of various thermal management are realized through the heat exchange of the cooling liquid loop and the refrigerant loop.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management systems for new energy vehicles, and in particular to a secondary heat exchange heat pump type thermal management system and a thermal management method. Background Art

[0002] In the field of thermal management systems, with the continuous development of technology, the requirements for systems to meet cooling and heating needs under different working conditions, improve energy efficiency, and optimize the coordinated work of various components are increasing. As an important thermal management solution, the secondary heat exchange heat pump type thermal management system has been widely used and studied in the automotive and other fields. It achieves effective cooling and heating of different components such as batteries, passenger compartments, and electric drives through the reasonable design of coolant circuits and refrigerant circuits, which plays a key role in improving system performance and equipment operation stability.

[0003] The secondary heat exchange heat pump type thermal management system disclosed in Chinese patent CN202410661258 sets a nine-way valve, a one-way valve, and a coolant three-way valve. Different coolant circuit states are achieved by switching their respective conduction modes, and the refrigerant circuit also responds to the multi-way valve switching mode to adjust the connection mode. Under summer cooling conditions, the refrigerant on the exhaust side of the compressor releases heat to the coolant circuit through the water-cooled condenser, and the coolant then releases heat to the outside air through the low-temperature radiator. The refrigerant on the intake side absorbs heat from the battery and the passenger compartment through the heat exchanger to achieve cooling; under winter air source heat pump heating conditions, the refrigerant on the exhaust side releases heat to the coolant circuit through the water-cooled condenser, and the heated coolant is heated through the heater core and the battery. The refrigerant on the intake side absorbs heat from the coolant through the heat exchanger, and the coolant flows through the low-temperature radiator to exchange heat with the outside air to absorb heat. The low-temperature radiator serves as a coolant heat release and heat absorption element in summer cooling and winter air source heat pump heating conditions, respectively, and the heat exchanger serves as a refrigerant heat absorption element in both conditions. Chinese patent CN202311603615 also uses a multi-way valve conduction mode to switch the coolant circuit state, and the refrigerant circuit is adjusted in coordination. The low-temperature radiator is reused as a coolant heat release element and a heat absorption element, and the battery cooler serves as a refrigerant heat absorption element in summer cooling and winter heat pump heating. In eight-way valve mode B, the water-cooled condenser, motor, and low-temperature radiator are connected in series, which can achieve motor heat dissipation and passenger compartment cooling and battery cooling at the same time; when the passenger compartment / battery are heated, the flow of the two can be distributed through the first coolant three-way valve, and the heating volume distribution can be achieved to a certain extent.

[0004] In the air source heat pump circuit of CN202410661258, the coolant first passes through the electric drive. Under driving conditions, the waste heat of the electric drive is dissipated in the low-temperature radiator, and the waste heat of the electric drive cannot be fully recovered. The system does not use a water source heat pump to absorb the heat circuit of the electric drive, and the recovery amount is limited. The water inlet temperature of the warm core and the battery pack cannot be effectively distributed during dual heating. The heated coolant first passes through the warm air core and then directly enters the battery pack. The battery state may be affected by the water temperature being higher than the allowable water inlet temperature of the battery pack. Motor heat dissipation and passenger compartment cooling and battery cooling cannot be carried out at the same time, affecting the commercial quality under summer driving conditions. The system of CN202311603615 does not use a water source heat pump to absorb the heat circuit of the electric drive, and the recovery amount is limited. Although the coolant flow distribution is achieved through the first coolant three-way valve, the requirements of the warm air core and the battery pack for the water inlet temperature cannot be met at the same time, affecting the battery state or the commercial quality of passenger compartment heating. When the passenger compartment is cooled and the electric drive is used for heat dissipation under summer driving conditions, the electric drive system and the water-cooled condenser are connected in series, and the heat exchange cannot be allocated according to the cooling needs of both. The two are highly coupled and restrict each other. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and to provide a water source heat pump that absorbs electric drive heat with a high heat recovery rate; under summer cooling conditions, the heat exchange can be allocated according to the cooling needs of the electric drive system and the passenger compartment / battery pack, and the two have a low degree of coupling and will not restrict each other; when the passenger compartment / battery pack is dual-heated, a secondary heat exchange heat pump type thermal management system and thermal management method can simultaneously meet the water inlet temperature requirements of the heater core and the battery pack.

[0006] To achieve this purpose, the secondary heat exchange heat pump type thermal management system designed by the present invention includes a heating, ventilation and air conditioning assembly, which includes a cold air core and a warm air core, and also includes a multi-way valve with at least nine interfaces, a coolant circuit connected to the nine different interfaces of the multi-way valve, and a refrigerant circuit that can exchange heat with the coolant circuit; the nine interfaces include interfaces one to nine; the coolant circuit includes an electric drive circuit, a heat dissipation circuit, a battery circuit, a coupling circuit connecting the electric drive circuit and the heat dissipation circuit to the multi-way valve, a first heat exchange coolant circuit connected to the warm air core and the first heat exchanger, and a A second heat exchange coolant circuit connected to the second heat exchanger and a cold air core circuit connected to the battery circuit and the cold air core; the coolant three-way valve can be used to introduce the coolant into the battery pack of the battery circuit and the cold air core circuit at a set ratio; the refrigerant circuit includes a refrigerant pipeline, and the compressor, the first heat exchanger and the second heat exchanger are connected in series through the refrigerant pipeline; the multi-way valve can realize the circulation flow of multiple coolants by controlling the mutual connection or cutoff between each interface, and the control and switching of multiple thermal management can be realized through the heat exchange between the coolant circuit and the refrigerant circuit.

[0007] Furthermore, one end of the electric drive circuit, one end of the heat dissipation circuit, and one end of the coupling circuit are respectively connected to any three different interfaces among interface one to interface nine; both ends of the battery circuit, both ends of the first heat exchange coolant circuit, and both ends of the second heat exchange coolant circuit are all connected to any two interfaces among the remaining six interfaces among interface one to interface nine, and both ends of the battery circuit, both ends of the first heat exchange coolant circuit, and both ends of the second heat exchange coolant circuit are connected to six different interfaces.

[0008] Furthermore, the electric drive circuit includes a coolant pipeline with one end connected to interface eight, the coolant pipeline connected to interface eight is connected to the electric drive assembly and the two-in-one module, and the other end of the coolant pipeline connected to interface eight is connected to the coupling circuit.

[0009] Furthermore, the heat dissipation circuit includes a coolant pipeline with one end connected to the interface seven, a radiator and a cooling fan are connected to the coolant pipeline connected to the interface seven, and the other end of the coolant pipeline connected to the interface seven is connected to the coupling circuit.

[0010] Furthermore, the battery circuit includes a coolant pipeline with two ends respectively connected to interface five and interface six, and the battery pack and the coolant three-way valve are connected to the coolant pipeline between the interface five and the interface six.

[0011] Furthermore, the cold air core circuit includes a coolant pipeline whose two ends are respectively connected to the coolant three-way valve and the coolant outlet of the battery pack, and the cold air core is connected to the coolant pipeline.

[0012] Furthermore, the coupling circuit includes a coolant pipeline with one end connected to the interface nine, and the other end of the coolant pipeline connected to the interface nine is connected to the electric drive circuit and the heat dissipation circuit.

[0013] Furthermore, the first heat exchange coolant circuit includes a coolant pipeline whose two ends are respectively connected to interface three and interface four, and the heater core and the first heat exchanger are both connected to the coolant pipeline between interface three and interface four.

[0014] Furthermore, the first heat exchange coolant circuit also includes a water heater connected to the coolant pipeline between the interface three and the interface four.

[0015] Furthermore, the second heat exchange coolant circuit includes a coolant pipeline with two ends respectively connected to the interface 1 and the interface 2, and the second heat exchanger is connected to the coolant pipeline between the interface 1 and the interface 2.

[0016] Furthermore, based on the thermal management method of the secondary heat exchange heat pump type thermal management system described above, it includes a coolant circuit thermal management method and a refrigerant circuit thermal pipeline method; the coolant circuit thermal management method includes a single-circuit coolant thermal management method for individually controlling one or more of the coolant circuits and a combined circuit coolant thermal pipeline method for connecting any at least two circuits in the coolant circuit to form at least one circulating coolant circuit; the refrigerant circuit thermal management method includes a refrigerant series circuit thermal management method for connecting the compressor with the first heat exchanger and the second heat exchanger.

[0017] Furthermore, the single-loop coolant thermal management method includes a single battery loop thermal management method, a single first heat exchange coolant loop thermal management method and a single cold air core loop thermal management method; the single battery loop thermal management method includes: connecting the water inlet and outlet ends of the battery loop through a multi-way valve, and at the same time, introducing the coolant into the battery pack through a coolant three-way valve, so that the coolant flows through the battery pack and performs uniform temperature control on the battery pack; the single first heat exchange coolant loop thermal management method includes: connecting the water inlet and outlet ends of the first heat exchange coolant loop through a multi-way valve, so that the coolant passes through the first heat exchanger and exchanges heat with the refrigerant in the first heat exchanger, so that the coolant flowing through the first heat exchanger absorbs heat; the single cold air core loop thermal management method includes: connecting the water inlet and outlet ends of the battery loop through a multi-way valve, and at the same time, introducing the coolant into the cold air core through a coolant three-way valve, and when the air is blown into the passenger compartment through the cold air core, the passenger compartment can be cooled or dehumidified.

[0018] Furthermore, the combined circuit coolant thermal pipeline method includes a first combined circuit thermal management method that combines the electric drive circuit, the heat dissipation circuit, the coupling circuit and the first heat exchange coolant circuit and performs thermal management control; a second combined circuit thermal management method that combines the second heat exchange coolant circuit with the battery circuit and performs thermal management control; a third combined circuit thermal management method that combines the battery circuit and the first heat exchange coolant circuit and performs thermal management control; a fourth combined circuit thermal management method that combines the electric drive circuit, the heat dissipation circuit and the second heat exchange coolant circuit and performs thermal management control; a fifth combined circuit thermal management method that combines the electric drive circuit, the coupling circuit and the second heat exchange coolant circuit and performs thermal management control; a sixth combined circuit thermal management method that combines the cold air core circuit and the second heat exchange coolant circuit and performs thermal management control; and a seventh combined circuit thermal management method that combines the battery circuit, the cold air core circuit and the second heat exchange coolant circuit and performs thermal management control.

[0019] Furthermore, the first combined circuit thermal management method includes: connecting the water outlet of the electric drive circuit with the water inlet of the heat dissipation circuit, connecting the water inlet of the first heat exchange coolant circuit with the water outlet of the coupling pipeline, and connecting the water outlet of the first heat exchange coolant circuit with the water inlet of the heat dissipation circuit through a multi-way valve; when the coolant flows through the electric drive circuit, the electric drive assembly can be cooled; when the coolant flows through the heat dissipation circuit, the coolant can dissipate heat or de-ice the radiator at the same time; when the coolant flows through the heater core in the first heat exchange coolant circuit, the air can be heated to achieve dehumidification or heating of the passenger compartment; when the coolant flows through the coupling circuit, it can enter the first heat exchange coolant circuit through the coupling circuit.

[0020] Furthermore, the thermal management method of the second combined circuit includes: connecting the water inlet end of the battery circuit with the water outlet end of the second heat exchange coolant circuit, and connecting the water outlet end of the battery circuit with the water inlet end of the second heat exchange coolant circuit through a multi-way valve; when the coolant flows through the battery circuit, the battery pack can be cooled or the temperature of the battery pack can be uniformly controlled, and when the coolant flows through the second heat exchange coolant circuit, it can exchange heat with the refrigerant in the second heat exchanger, so that the coolant flowing through the second heat exchanger releases heat.

[0021] Furthermore, the third combined circuit thermal management method includes the following two methods:

[0022] Method 1: The third combined circuit thermal management method includes: connecting the water inlet end of the battery circuit with the water outlet end of the first heat exchange coolant circuit through a multi-way valve, and connecting the water outlet end of the battery circuit with the water inlet end of the first heat exchange coolant circuit; when the coolant flows through the battery circuit, the battery pack can be heated, and when the coolant flows through the first heat exchange coolant circuit, the passenger compartment can be heated.

[0023] Method 2: The third combined circuit thermal management method includes: connecting the water inlet end of the battery circuit with the water outlet end of the first heat exchange coolant circuit through a multi-way valve, connecting the water outlet end of the battery circuit with the water inlet end of the first heat exchange coolant circuit, connecting the water inlet end of the battery circuit with the water outlet end, and connecting the water inlet end of the first heat exchange coolant circuit with the water outlet end; when the coolant flows through the battery circuit, the battery pack can be heated, and when the coolant flows through the first heat exchange coolant circuit, the passenger compartment can be heated.

[0024] Furthermore, the fourth combined circuit thermal management method includes: connecting the water outlet of the electric drive circuit with the water inlet of the second heat exchange coolant circuit through a multi-way valve, connecting the water inlet of the heat dissipation circuit with the water outlet of the second heat exchange coolant circuit, and cutting off the interface connected to the coupling pipeline; when the coolant flows through the electric drive circuit, the electric drive assembly can be cooled, when the coolant flows through the heat dissipation circuit, the coolant can absorb heat, and when the coolant flows through the second heat exchange coolant circuit, it can exchange heat with the refrigerant in the second heat exchanger, so that the coolant flowing through the second heat exchanger releases heat.

[0025] Furthermore, the fifth combined circuit thermal management method includes: connecting the water outlet of the electric drive circuit with the water inlet of the second heat exchange coolant circuit through a multi-way valve, connecting the water outlet of the second heat exchange coolant circuit with the water inlet of the coupling circuit, and cutting off the interface connected to the heat dissipation circuit; when the coolant flows through the electric drive circuit, the electric drive assembly can be cooled; when the coolant flows through the coupling circuit, the coolant can be introduced into the electric drive circuit through the coupling circuit; when the coolant flows through the second heat exchange coolant circuit, it can exchange heat with the refrigerant in the second heat exchanger, so that the coolant flowing through the second heat exchanger releases heat.

[0026] Furthermore, the sixth combined circuit thermal management method includes: connecting the water inlet end of the battery circuit with the water outlet end of the second heat exchange coolant circuit through a multi-way valve, and connecting the water outlet end of the battery circuit with the water inlet end of the second heat exchange coolant circuit; when the coolant flows through the battery circuit, the coolant is introduced into the cold air core circuit through the coolant three-way valve, and the coolant can cool the passing air when flowing through the cold air core, and when the coolant flows through the second heat exchange coolant circuit, it can exchange heat with the refrigerant in the second heat exchanger, so that the coolant flowing through the second heat exchanger releases heat.

[0027] Furthermore, the seventh combined circuit thermal management method includes: connecting the water inlet end of the battery circuit with the water outlet end of the second heat exchange coolant circuit through a multi-way valve, and connecting the water outlet end of the battery circuit with the water inlet end of the second heat exchange coolant circuit; when the coolant flows through the battery circuit, the coolant is introduced into the battery pack and the cold air core circuit according to a set ratio through the coolant three-way valve to cool the battery pack or achieve uniform temperature control of the battery pack, and when the coolant flows through the cold air core, the passing air can be cooled, and when the coolant flows through the second heat exchange coolant circuit, it can exchange heat with the refrigerant in the second heat exchanger, so that the coolant flowing through the second heat exchanger releases heat.

[0028] Furthermore, the refrigerant series circuit thermal management method includes: starting the compressor, the refrigerant on the exhaust side of the compressor passes through the first heat exchanger and the second heat exchanger successively, the refrigerant passing through the first heat exchanger releases heat, the coolant passing through the first heat exchanger absorbs heat, the refrigerant passing through the second heat exchanger absorbs heat, and the coolant passing through the second heat exchanger releases heat.

[0029] The beneficial effects of the present invention are as follows: the secondary heat exchange heat pump type thermal management system and thermal management method of the present invention are innovatively designed to address the deficiencies of the prior art, and show significant advantages in energy recovery and utilization, cooling and heating performance, and system adaptability, thereby effectively improving the comprehensive performance of the thermal management system. The water source heat pump method is used to absorb the heat of the electric drive, which significantly improves the recovery rate of the waste heat of the electric drive compared to the traditional system. In the traditional system, the waste heat of the electric drive is often partially dissipated in the low-temperature radiator and cannot be fully recycled, while the present invention can effectively collect and reuse the heat generated by the electric drive. Under certain working conditions, the electric drive circuit works in coordination with other circuits. After the coolant takes away the heat of the electric drive assembly, it transfers the heat to the components that need to be heated, such as the battery pack or the passenger compartment, through heat exchange with the refrigerant circuit, to achieve efficient recovery and reuse of energy, reduce energy waste, and improve the energy utilization efficiency of the entire system. In the summer cooling condition, the heat exchange amount can be flexibly allocated according to the actual cooling needs of the electric drive system and the passenger compartment / battery pack, thereby reducing the coupling between the two. In the traditional system, the electric drive system is connected in series with the water-cooled condenser, resulting in limited cooling capacity distribution and mutual restriction of cooling requirements of different components. The present invention uses a multi-way valve and reasonable circuit design to make the electric drive circuit, the cold air core circuit and the battery circuit work independently and collaboratively. When the electric drive system is under high load and generates a lot of heat, more coolant can be allocated to cool it first; when the passenger compartment needs to be cooled, the flow direction and flow of the coolant can be adjusted to meet the cooling requirements of the passenger compartment without affecting the normal operation of the electric drive system, thereby improving the performance and reliability of the system under summer cooling conditions. Under the dual heating conditions of the passenger compartment / battery pack, the different requirements of the warm air core and the battery pack for the water inlet temperature can be met at the same time. In the case of dual heating, it is difficult for the traditional system to effectively distribute the water inlet temperature of the warm core and the battery pack. The heated coolant first passes through the warm air core and then enters the battery pack, which may affect the battery state due to excessive water temperature. With the help of the coordinated control of the coolant three-way valve and the multi-way valve, the present invention can accurately adjust the coolant temperature entering the battery pack and the warm air core. By controlling the coolant three-way valve, the coolant is introduced into the battery circuit and the cold air core circuit according to the set ratio, and combined with the multi-way valve to control the connectivity of each circuit, the coolant temperature can be accurately adjusted during the heating process of the battery pack and the passenger compartment, which not only ensures the comfortable heating of the passenger compartment, but also ensures that the battery pack works at an appropriate temperature, extending the battery life and improving battery performance. The system contains multiple interrelated coolant circuits and refrigerant circuits. The connectivity or cutoff of each interface is controlled by a multi-way valve, which can realize a variety of coolant circulation flow modes to meet the thermal management requirements under different working conditions. A variety of combined circuit thermal management methods cover multiple functions such as electric drive system cooling, battery pack cooling / heating, and passenger compartment cooling / heating.The first combined circuit thermal management method can realize functions such as cooling the electric drive assembly, cooling the coolant or deicing the radiator, and dehumidifying or heating the passenger compartment; the second combined circuit thermal management method can cool or evenly control the temperature of the battery pack and exchange heat with the second heat exchanger. These combinations enable the system to flexibly respond to various complex working conditions, whether it is extremely hot in summer or cold in winter, it can provide a stable and suitable operating temperature environment for all components of the vehicle. The single-loop coolant thermal management method controls the battery pack, the first heat exchange coolant circuit, and the cold air core circuit separately, effectively ensuring the stable operation of each component. The single battery circuit thermal management method uses the cooperation of a multi-way valve and a coolant three-way valve to allow the coolant to flow through the battery pack, thereby achieving uniform temperature control of the battery pack and preventing the battery pack from being affected in performance and life due to excessively high or low temperatures; the single first heat exchange coolant circuit thermal management method allows the coolant to exchange heat with the refrigerant in the first heat exchanger, allowing the coolant to absorb heat and meet the thermal management requirements under specific working conditions; the single cold air core circuit thermal management method controls the coolant to flow to the cold air core to achieve passenger compartment cooling or dehumidification, thereby improving the comfort of the driver and passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a secondary heat exchange heat pump type thermal management system with a water heater in the present invention;

[0031] Figure 2 It is a schematic diagram of a secondary heat exchange heat pump type thermal management system without a water heater in the present invention;

[0032] Figure 3 It is a schematic diagram of the refrigerant flow state in the present invention;

[0033] Figure 4 Schematic diagram of the interface connection of each mode of the multi-way valve in the present invention;

[0034] Figure 5 Schematic diagram of the flow of coolant when the multi-way valve of the present invention is in the mode 1 and the coolant three-way valve is connected to the battery circuit and the cold air core circuit at the same time;

[0035] Figure 6 is a schematic diagram of the coolant flow when the coolant three-way valve is connected only to the battery circuit in mode three of the multi-way valve of the present invention;

[0036] Figure 7 Schematic diagram of coolant flow when the coolant three-way valve is connected only to the battery circuit in mode seven of the multi-way valve of the present invention;

[0037] Among them, 1-compressor, 2-first heat exchanger, 3-second heat exchanger, 4-first electronic expansion valve, 5-coolant three-way valve, 6-first electronic water pump, 7-second electronic water pump, 8-third electronic water pump, 9-cooling fan, 10-first coolant one-way valve, 11-second coolant one-way valve, 12-warm air core, 13-cold air core, 14-blower, 15-radiator, 16-two-in-one module, 17-electric drive assembly, 18-battery pack, 19-multi-way valve, 20-heating, ventilation and air conditioning assembly , 21—internal and external circulation damper, 22—hot and cold air mixing damper, 23—air outlet mode damper, 24—liquid storage dryer, 25—low-pressure side refrigerant temperature and pressure sensor, 26—high-pressure side refrigerant temperature and pressure sensor, 27—water heater, 100—refrigerant pipeline, 200—coolant pipeline, 300—electric drive circuit, 400—heat dissipation circuit, 500—battery circuit, 600—coupling circuit, 700—first heat exchange coolant circuit, 800—second heat exchange coolant circuit, 900—cold air core circuit. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] like Figure 1 As shown in FIG. 2 , the secondary heat exchange heat pump type thermal management system designed by the present invention is intended to achieve efficient thermal management control and switching to meet the thermal requirements of electric vehicles under different operating conditions. In some embodiments, a water heater 27 (such as Figure 1 In other embodiments, there is no water heater 27 (such as Figure 2 shown).

[0040] Overall system architecture

[0041] The thermal management system designed by the present invention includes a heating, ventilation and air conditioning assembly 20, which includes a cold air core 13 and a warm air core 12. The air can be blown into the passenger compartment through a blower 14. The air can be cooled when passing through the cold air core 13, heated when passing through the warm air core 12, and dehumidified when passing through the cold air core 13 and the warm air core 12 in sequence. In addition, a multi-way valve 19 with nine interfaces, interface one to interface nine, a coolant circuit connected to the nine different interfaces of the multi-way valve 19, and a refrigerant circuit that can exchange heat with the coolant circuit are provided. The multi-way valve 19 realizes the circulation of multiple coolants by controlling the interconnection or cutoff between the interfaces, and at the same time, achieves the control and switching of multiple thermal management by means of the heat exchange between the coolant circuit and the refrigerant circuit.

[0042] Based on the above HVAC assembly 20 , the following specific embodiments of a coolant circuit and a refrigerant circuit are provided.

[0043] Coolant circuit example:

[0044] The coolant circuit includes an electric drive circuit 300 that can realize cooling of the electric drive assembly 17 and heat absorption of the coolant, a heat dissipation circuit 400 that can realize heat release or heat absorption of the coolant, a battery circuit 500 that can realize battery temperature equalization operation, a coupling circuit 600 that can introduce the coolant flowing through the heat dissipation circuit 400 into the multi-way valve 19 and is simultaneously connected to the water inlet end of the electric drive circuit 17, a first heat exchange coolant circuit 700 that is connected to the first heat exchanger 2 and can exchange heat with the refrigerant on the exhaust side of the compressor passing through the first heat exchanger 2, a second heat exchange coolant circuit 800 that is connected to the second heat exchanger 3 and can exchange heat with the refrigerant entering the second heat exchanger 3 through the first heat exchanger 2, and a cold air cooling core circuit 900 connected to the cold air core 13. The coolant can be introduced into the battery circuit 500 and the cold air core circuit 900 in proportion through the coolant three-way valve 5.

[0045] The electric drive circuit 300 includes a coolant pipeline 200 with one end connected to the interface 8, which is connected to the electric drive assembly 17 and the two-in-one module 16 in sequence. The other end of the coolant pipeline 200 is connected to the coupling circuit 600, which is mainly responsible for the cooling and heat management of the electric drive system.

[0046] The heat dissipation circuit 400 includes a coolant pipeline 200 connected to the interface 7, on which a radiator 15 and a cooling fan 9 are arranged, and the other end is connected to the coupling circuit 600 for functions such as heat dissipation of the coolant and deicing of the radiator.

[0047] The battery circuit 500 includes a coolant pipeline 200 with two ends respectively connected to interface five and interface six, on which a battery pack 18 is installed to achieve cooling, heating and uniform temperature control of the battery pack 18.

[0048] The coupling loop 600 includes a coolant pipeline 200 with one end connected to the interface nine, and the other end of the coolant pipeline 200 is connected to the electric drive circuit 300 and the heat dissipation circuit 400, playing the role of connecting and coordinating the electric drive circuit and the heat dissipation circuit.

[0049] The first heat exchange coolant circuit 700 includes a coolant pipe 200 with two ends connected to the interface 3 and the interface 4 respectively, which is connected to the heater core 12 and the first heat exchanger 2, and in some cases is also connected to the water heater 27. The circuit can realize the functions of heating and dehumidifying the passenger compartment and heat exchange with the refrigerant.

[0050] The second heat exchange coolant loop 800 includes a coolant pipeline 200 with two ends respectively connected to interface 1 and interface 2, and a second heat exchanger 3 is connected thereto, which is mainly used for heat exchange with the refrigerant to meet the heat transfer requirements under different working conditions.

[0051] The cold air core circuit 900 includes a coolant pipe 200 whose two ends are connected to the coolant inlet and outlet of the battery pack 18, on which the cold air core 13 is connected, and the coolant inlet of the battery pack is connected to the coolant inlet of the cold air core circuit 900 and the coolant inlet of the battery pack 18 through the coolant three-way valve 5. It is used to realize functions such as cooling and dehumidification of the passenger compartment.

[0052] Refrigerant circuit example:

[0053] The refrigerant circuit includes a refrigerant pipeline 100 , through which the compressor 1 , the first heat exchanger 2 and the second heat exchanger 3 are connected in series.

[0054] Through such a design, the secondary heat exchange heat pump type thermal management system can flexibly adjust the working status of the coolant circuit and the refrigerant circuit under different working conditions, achieve efficient thermal management, and improve the performance and stability of electric vehicles.

[0055] like Figure 1 As shown in FIG. 7 , the heat pump type thermal management system based on the above secondary heat exchange can achieve thermal management of the following working conditions:

[0056] Embodiment 1: Dual cooling condition in summer.

[0057] The multi-way valve 19 is in mode 1, the connection status is interface one through interface six, interface two through interface five, interface three through interface nine, interface four + interface eight through interface seven, and the coolant three-way valve 5 status is a proportional through b and c.

[0058] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and then enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4. The refrigerant flows to Figure 3 shown.

[0059] When the third electronic water pump 8 is running, the coolant flows through the second heat exchanger 3 to exchange heat with the refrigerant. After the coolant releases heat and cools down, it is diverted to port b and port c through port a of the coolant three-way valve 5. The coolant flowing out of port c enters the battery pack 18 to complete the cooling, and the coolant flowing out of port b enters the cold air core 13. The air is taken in by the blower 14 to exchange heat with the cold air core 13 and release heat, thereby completing the cooling of the passenger compartment.

[0060] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, the exhaust gas of the compressor 1 exchanges heat with the coolant in the first heat exchanger 2, and the coolant absorbs heat and flows through the water heater 27 (such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 system).

[0061] If the electric drive assembly 17 has a cooling demand, the second electronic water pump 7 will start, the second coolant one-way valve 11 will be turned on, and the coolant will flow through the two-in-one module 16 and the electric drive assembly 17, taking away the heat of both, and then flow through interface eight to interface seven of the multi-way valve 19 and merge with the coolant passing through the warm air core 12 to enter the first radiator 15. Through the cooling fan 9 or the vehicle facing the wind, the coolant will exchange heat with the outside air. After releasing heat and cooling, the coolant will flow into the second coolant one-way valve 11 and interface nine of the multi-way valve 19 respectively, and then pass through interface three to the first coolant one-way valve 10 to complete the cycle.

[0062] If there is no demand from the electric drive assembly 17, the second electronic water pump 7 stops, the second coolant one-way valve 11 is closed, and the coolant passes through the heater core 12 and enters the first radiator 15. The coolant exchanges heat with the outside air through the cooling fan 9 or the vehicle facing the wind, and the coolant releases heat and cools down. Then, it flows into the multi-way valve interface nine and interface three to the first coolant one-way valve 10, completing the cycle.

[0063] Embodiment 2: Refrigeration condition of a single passenger cabin in summer.

[0064] The multi-way valve 19 is in mode 1, the connected state is interface one to interface six, interface two to interface five, interface three to interface nine, interface four + interface eight to interface seven, and the state of the coolant three-way valve 5 is a to b.

[0065] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and then enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4. The refrigerant flows to Figure 3 shown.

[0066] When the third electronic water pump 8 is running, the coolant flows through the second heat exchanger 3 to exchange heat with the refrigerant. After the coolant releases heat and cools down, it passes through the port a to the port b of the coolant three-way valve 5. The coolant flowing out of the port b enters the cold air core 13, and the air is taken in by the blower 14 to exchange heat with the cold air core 13 and release heat, thereby completing the cooling of the passenger compartment.

[0067] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, the exhaust gas of the compressor 1 exchanges heat with the coolant in the first heat exchanger 2, and the coolant absorbs heat and flows through the water heater 27 (such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 system).

[0068] If the electric drive assembly 17 has a cooling demand, the second electronic water pump 7 will start, the second coolant one-way valve 11 will be turned on, and the coolant will flow through the two-in-one module 16 and the electric drive assembly 17, taking away the heat from both, and then flow through the multi-way valve 19 interface eight to interface seven and merge with the coolant passing through the warm air core 12 to enter the first radiator 15. Through the cooling fan 9 or the vehicle facing the wind and heat exchange with the outside air, the coolant releases heat and cools down, and then flows into the second coolant one-way valve 11 and the multi-way valve interface nine and interface three to the first coolant one-way valve 10 respectively to complete the cycle.

[0069] If there is no demand from the electric drive assembly 17, the second electronic water pump 7 stops, the second coolant one-way valve 11 is closed, and the coolant passes through the heater core 12 and enters the first radiator 15. The coolant exchanges heat with the outside air through the cooling fan 9 or the vehicle facing the wind, and the coolant releases heat and cools down. Then, it flows into the multi-way valve interface nine and interface three to the first coolant one-way valve 10, completing the cycle.

[0070] Embodiment 3: Single battery pack cooling condition during vehicle charging.

[0071] The multi-way valve 19 is in mode 1, the connected state is interface one through interface six, interface two through interface five, interface three through interface nine, interface four + interface eight through interface seven, and the state of the coolant three-way valve 5 is a through c.

[0072] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and then enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4. The refrigerant flows to Figure 3 shown.

[0073] The third electronic water pump 8 is running, and the coolant flows through the second heat exchanger 3 to exchange heat with the refrigerant. After the coolant releases heat and cools down, it flows through port a to port c of the coolant three-way valve 5. The coolant flowing out of port c enters the battery pack 18 to complete the cooling.

[0074] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, the exhaust gas of the compressor 1 exchanges heat with the coolant in the first heat exchanger 2, and the coolant absorbs heat and flows through the water heater 27 (such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 system).

[0075] If the electric drive assembly 17 has a cooling demand, the second electronic water pump 7 will start, the second coolant one-way valve 11 will be turned on, and the coolant will flow through the two-in-one module 16 and the electric drive assembly 17, taking away the heat from both, and then flow through interface eight to interface seven of the multi-way valve 19 and merge with the coolant passing through the heater core 12 to enter the first radiator 15. Through the cooling fan 9 or the vehicle facing the wind, the coolant will exchange heat with the outside air. After releasing heat and cooling, the coolant will flow into the second coolant one-way valve 11 and interface nine of the multi-way valve 19 respectively, and then pass through interface three to the first coolant one-way valve 10 to complete the cycle.

[0076] If there is no demand from the electric drive assembly 17, the second electronic water pump 7 stops, the second coolant one-way valve 11 is closed, and the coolant enters the first radiator 15 through the heater core 12, exchanges heat with the outside air through the cooling fan 9 or the vehicle facing the wind, and the coolant releases heat and cools, and then flows into the multi-way valve interface nine and interface three to the first coolant one-way valve 10 to complete the cycle.

[0077] Embodiment 4: Dehumidification working condition of passenger compartment in spring and autumn.

[0078] The multi-way valve 19 is in mode 1, the connected state is interface one to interface six, interface two to interface five, interface three to interface nine, interface four + interface eight to interface seven, and the state of the coolant three-way valve 5 is a to b.

[0079] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and then enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4. The refrigerant flows to Figure 3 shown.

[0080] The third electronic water pump 8 is running, and the coolant flows through the second heat exchanger 3 to exchange heat with the refrigerant. After the coolant releases heat and cools down, it flows through the port a of the coolant three-way valve 5 to the port b, and the coolant flowing out of the port b enters the cold air core 13 to complete the refrigeration. At the same time, the first electronic water pump 6 is running, the first coolant check valve 10 is turned on, the exhaust gas of the compressor 1 exchanges heat with the coolant in the first heat exchanger 2, and the coolant absorbs heat and flows through the water heater 27 (such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 system), through the cold and warm air mixing damper 22, the air flows through the heater core 12 and exchanges heat with the coolant therein to absorb heat, thereby completing the dehumidification of the passenger compartment.

[0081] If the electric drive assembly 17 has a cooling demand, the second electronic water pump 7 will start, the second coolant one-way valve 11 will be turned on, and the coolant will flow through the two-in-one module 16 and the electric drive assembly 17, taking away the heat of both and then merging with the coolant passing through the warm air core 12 to enter the first radiator 15, and heat exchange with the outside air through the cooling fan 9 or the vehicle facing the wind. After the coolant releases heat and cools, it will flow into the second coolant one-way valve 11 and the interface nine of the multi-way valve 19 respectively, and then pass through the interface three to the first coolant one-way valve 10 to complete the cycle.

[0082] Embodiment 5: Special working condition: After intense driving in winter, there is a need for cooling the battery pack during charging and for heating the passenger compartment.

[0083] The multi-way valve 19 is in mode 1, the connected state is interface one through interface six, interface two through interface five, interface three through interface nine, interface four + interface eight through interface seven, and the state of the coolant three-way valve 5 is a through c.

[0084] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and then enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4. The refrigerant flows to Figure 3 shown.

[0085] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, the exhaust gas of the compressor 1 exchanges heat with the coolant in the first heat exchanger 2, and the coolant absorbs heat and flows through the water heater 27 (such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 The system) uses the blower 14 to intake air so that the air exchanges heat with the heater core 12 to absorb heat, and the coolant releases heat, thereby completing the heating of the passenger compartment.

[0086] The second electronic water pump 7 is running, the second coolant one-way valve 11 is turned on, and the coolant flows through the two-in-one module 16 and the electric drive assembly 17, takes away the heat of both, and then merges with the coolant passing through the heater core 12 to enter the first radiator 15, and exchanges heat with the outside air through the cooling fan 9 or the vehicle facing the wind, the coolant releases heat, and the cycle is completed.

[0087] The third electronic water pump 8 is running, and the coolant flows through the second heat exchanger 3 to exchange heat with the refrigerant. After the coolant releases heat and cools down, it flows through port a to port c of the coolant three-way valve 5. The coolant flowing out of port c enters the battery pack 18 to complete the cooling.

[0088] Embodiment 6: Special working condition, radiator deicing.

[0089] The multi-way valve 19 is in mode 1, the connection status is interface 1 to interface 6, interface 2 to interface 5, interface 3 to interface 9, interface 4 + interface 8 to interface 7, compressor 1 is stopped, and the refrigerant circuit is stationary.

[0090] for Figure 1 In the system shown, the first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, and the coolant flows through the first heat exchanger 2 and then enters the water heater 27. At this time, the water heater 27 works to heat the coolant flowing therein, and then the coolant flows through the heater core 12. The second electronic water pump 7 stops, the second coolant one-way valve 11 is turned off, and the coolant flowing through the heater core 12 enters the first radiator 15. The coolant dissipates heat to the outer surface of the first radiator 15, completing the deicing.

[0091] for Figure 2 In the system shown, the second electronic water pump 7 is running, the second coolant one-way valve 11 is turned on, and the electric drive assembly 17 generates heat to heat the coolant flowing therethrough. The first electronic water pump 6 is stopped, and the first coolant one-way valve 10 is cut off. The coolant flowing through the electric drive assembly 17 enters the first radiator 15, and the coolant dissipates heat to the outer surface of the first radiator 15, thereby completing de-icing.

[0092] Embodiment 7: In the dual heating condition in winter when the air source heat pump is available, the outlet water temperature of the heater core is within the acceptable range of the inlet water temperature of the battery pack.

[0093] The multi-way valve 19 is in mode 2, the connected state is interface one through interface eight, interface two through interface seven, interface three through interface six, interface four through interface five, interface nine is cut off, and the state of the coolant three-way valve 5 is a through c.

[0094] The second electronic water pump 7 is running, the second coolant one-way valve 11 is turned on, and the coolant flows through the two-in-one module 16 and the electric drive assembly 17 (the coolant can be heated by heat generation, such as Figure 2 system) and then enters the second heat exchanger 3.

[0095] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4, where it exchanges heat with the coolant. The refrigerant absorbs heat from the coolant, and the coolant releases heat. The refrigerant after flowing through the second heat exchanger 3 enters the compressor suction port to complete the cycle. The refrigerant flows to Figure 3 shown.

[0096] The coolant flows through the second heat exchanger 3 and enters the first radiator 15, and exchanges heat with the outside air through the cooling fan 9 or the vehicle facing the wind. The coolant absorbs heat from the outside air, and the outside air releases heat, completing the cycle.

[0097] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, the coolant flowing through the first heat exchanger 2 exchanges heat with the refrigerant from the exhaust port of the compressor 1, the coolant absorbs heat, the refrigerant releases heat, and then the coolant flows through the water heater 27 (which can work to assist in heating the coolant, such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2The system) uses the blower 14 to take in air, so that the air and the heater core 12 undergo heat exchange and absorb heat, while the coolant releases heat, thereby completing the heating of the passenger compartment.

[0098] The third electronic water pump 8 is running, and the coolant from the heater core 12 passes through the third electronic water pump 8 and flows through the port a to the port c of the coolant three-way valve 5, enters the water inlet of the battery pack 18, flows through the battery pack 18 to complete the heating of the battery pack, and then returns to the first coolant one-way valve 10 to complete the cycle.

[0099] Embodiment 8: In the single battery pack heating condition when the air source heat pump is available in winter, the heater core 12 does not exchange heat but only acts as a flow resistance.

[0100] The multi-way valve 19 is in mode 2, the connected state is interface one through interface eight, interface two through interface seven, interface three through interface six, interface four through interface five, interface nine is cut off, and the state of the coolant three-way valve 5 is a through c.

[0101] The second electronic water pump 7 is running, the second coolant one-way valve 11 is turned on, and the coolant flows through the two-in-one module 16 and the electric drive assembly 17 (which can assist in heating the coolant by generating heat) and then enters the second heat exchanger 3 .

[0102] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4, where it exchanges heat with the coolant. The refrigerant absorbs heat from the coolant, and the coolant releases heat. The refrigerant after flowing through the second heat exchanger 3 enters the compressor suction port to complete the cycle. The refrigerant flows to Figure 3 shown.

[0103] After flowing through the second heat exchanger 3, the coolant enters the first radiator 15, and exchanges heat with the outside air through the cooling fan 9 or the vehicle facing the wind. The coolant absorbs heat from the outside air, and the outside air releases heat, completing the cycle.

[0104] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, and the coolant flowing through the first heat exchanger 2 exchanges heat with the refrigerant from the exhaust port of the compressor 1, the coolant absorbs heat, and the refrigerant releases heat, and then the coolant flows through the water heater 27 (which can work to assist in heating the coolant, such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 The blower 14 stops and the heater core 12 does not exchange heat.

[0105] The third electronic water pump 8 is running, and the coolant from the heater core 12 passes through the third electronic water pump 8 and flows through the port a to the port c of the coolant three-way valve 5, enters the water inlet of the battery pack 18, flows through the battery pack 18 to complete the heating of the battery pack, and then returns to the first coolant one-way valve 10 to complete the cycle.

[0106] Embodiment 9: In the dual heating condition when the air source heat pump is available in winter, the outlet water temperature of the heater core is higher than the acceptable threshold of the inlet water temperature of the battery pack, and the outlet water of the battery pack needs to be partially mixed into its water inlet.

[0107] The multi-way valve 19 is in mode 3, the connected state is interface one through interface eight, interface two through interface seven, interface three, interface four, interface five, interface six mixed water, interface nine cut-off, and the coolant three-way valve 5 state is a through c.

[0108] The second electronic water pump 7 is running, the second coolant one-way valve 11 is turned on, and the coolant flows through the two-in-one module 16 and the electric drive assembly 17 (the coolant can be heated by heat generation, such as Figure 2 system) and then enters the second heat exchanger 3.

[0109] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and then enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4, and exchanges heat with the coolant. The refrigerant absorbs heat from the coolant, and the coolant releases heat. The refrigerant after flowing through the second heat exchanger 3 enters the compressor suction port to complete the cycle. The refrigerant flows to Figure 3 shown.

[0110] After flowing through the second heat exchanger 3, the coolant enters the first radiator 15, and exchanges heat with the outside air through the cooling fan 9 or the vehicle facing the wind. The coolant absorbs heat from the outside air, and the outside air releases heat, completing the cycle.

[0111] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, and the coolant flowing through the first heat exchanger 2 exchanges heat with the refrigerant from the exhaust port of the compressor 1, the coolant absorbs heat, and the refrigerant releases heat, and then the coolant flows through the water heater 27 (which can work to assist in heating the coolant, such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 The system) uses the blower 14 to intake air so that the air exchanges heat with the heater core 12 to absorb heat, and the coolant releases heat, thereby completing the heating of the passenger compartment.

[0112] At this time, interface four and interface six of the multi-way valve 19 are connected with interface three and interface five thereof. The coolant after flowing through the heater core 12 enters interface four of the multi-way valve 19 and is then diverted to interface three and interface five. The third electronic water pump 8 starts operating, and the coolant flows through port a to port c of the coolant three-way valve 5 and enters the battery pack 18. Then the coolant enters interface six of the multi-way valve 19 and is diverted to interface three and interface five thereof. Part of the coolant at the outlet of the battery pack 18 and part of the coolant flowing through the heater core 12 are mixed at interface five and then returned to the water inlet of the battery pack 18, completing the heating of the battery pack 18 and controlling its water inlet temperature within the required temperature. At the same time, part of the water outlet of the battery pack 18 is mixed at interface six of the multi-way valve 19 with the coolant flowing through the heater core 12 and diverted to interface four and then returned to the first coolant one-way valve 10, completing the water circuit circulation.

[0113] Embodiment 10: Heating condition of a single passenger cabin when an air source heat pump is available in winter.

[0114] The multi-way valve 19 is in mode 4, the connected state is interface one through interface eight, interface two through interface seven, interface three through interface four, interface five through interface six, interface nine is cut off, and the state of the coolant three-way valve 5 is a through c.

[0115] The second electronic water pump 7 is running, the second coolant one-way valve 11 is turned on, and the coolant flows through the two-in-one module 16 and the electric drive assembly 17 (the coolant can be heated by heat generation, such as Figure 2 system) and then enters the second heat exchanger 3.

[0116] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4, and exchanges heat with the coolant flowing through it. The refrigerant absorbs heat from the coolant, and the coolant releases heat. The refrigerant after flowing through the second heat exchanger 3 enters the compressor suction port to complete the cycle. The refrigerant flows to Figure 3 shown.

[0117] After flowing through the second heat exchanger 3, the coolant enters the first radiator 15, and exchanges heat with the outside air through the cooling fan 9 or the vehicle facing the wind. The coolant absorbs heat from the outside air, and the outside air releases heat, completing the cycle.

[0118] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, the coolant flowing through the first heat exchanger 2 exchanges heat with the refrigerant from the exhaust port of the compressor 1, the coolant absorbs heat, the refrigerant releases heat, and then the coolant flows through the water heater 27 (which can work to assist in heating the coolant, such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 The system) uses the blower 14 to intake air so that the air exchanges heat with the heater core 12 to absorb heat, and the coolant releases heat, thereby completing the heating of the passenger compartment.

[0119] If the battery pack 18 has a requirement for temperature equalization at this time, the third electronic water pump 8 will be operated.

[0120] If the battery pack 18 has no temperature equalization requirement at this time, the third electronic water pump 8 stops.

[0121] Embodiment 11: In a dual heating condition in a cold region where an air source heat pump is unavailable and only a water source heat pump is available, the outlet water temperature of the heater core 12 is within an acceptable range of the inlet water temperature of the battery pack 18 .

[0122] The multi-way valve 19 is in mode 5, the connected state is interface one through interface eight, interface two through interface nine, interface three through interface six, interface four through interface five, interface seven is cut off, and the state of the coolant three-way valve 5 is a through c.

[0123] The second electronic water pump 7 is running, the second coolant one-way valve 11 is turned on, and the coolant flows through the two-in-one module 16 and the electric drive assembly 17 (the coolant can be heated by heat generation, such as Figure 2 system), takes away the heat and enters the second heat exchanger 3, where it returns to the second coolant one-way valve 11 after heat exchange, completing the cycle.

[0124] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4, and exchanges heat with the coolant flowing through it. The refrigerant absorbs heat from the coolant, and the coolant releases heat. The refrigerant after flowing through the second heat exchanger 3 enters the compressor suction port to complete the cycle. The refrigerant flows to Figure 3 shown.

[0125] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, and the coolant flowing through the first heat exchanger 2 exchanges heat with the refrigerant from the exhaust port of the compressor 1, the coolant absorbs heat, and the refrigerant releases heat, and then the coolant flows through the water heater 27 (which can work to assist in heating the coolant, such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 The system) uses the blower 14 to intake air so that the air exchanges heat with the heater core 12 to absorb heat, and the coolant releases heat, thereby completing the heating of the passenger compartment.

[0126] The third electronic water pump 8 is running, and the coolant from the heater core 12 enters the water inlet of the battery pack 18 after passing through the third electronic water pump 8, flows through the battery pack 18 to complete the heating of the battery pack, and then returns to the first coolant one-way valve 10 to complete the cycle.

[0127] Embodiment 12: In a single battery pack heating condition where an air source heat pump is unavailable in cold regions and only a water source heat pump is available, the heater core 12 does not exchange heat but only serves as a flow resistance.

[0128] The multi-way valve 19 is in mode 5, the connected state is interface one through interface eight, interface two through interface nine, interface three through interface six, interface four through interface five, interface seven is cut off, and the state of the coolant three-way valve 5 is a through c.

[0129] The second electronic water pump 7 is running, the second coolant one-way valve 11 is turned on, and the coolant flows through the two-in-one module 16 and the electric drive assembly 17 (the coolant can be heated by heat generation, such as Figure 2 system), takes away the heat and enters the second heat exchanger 3, where it returns to the second coolant one-way valve 11 after heat exchange, completing the cycle.

[0130] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4, and exchanges heat with the coolant flowing through it. The refrigerant absorbs heat from the coolant, and the coolant releases heat. The refrigerant after flowing through the second heat exchanger 3 enters the compressor suction port to complete the cycle. The refrigerant flows to Figure 3 shown.

[0131] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, the coolant flowing through the first heat exchanger 2 exchanges heat with the refrigerant from the exhaust port of the compressor 1, the coolant absorbs heat, the refrigerant releases heat, and then the coolant flows through the water heater 27 (which can work to assist in heating the coolant, such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 The blower 14 stops and the heater core 12 does not exchange heat.

[0132] The third electronic water pump 8 is running, and the coolant from the heater core 12 enters the water inlet of the battery pack 18 after passing through the third electronic water pump 8, flows through the battery pack 18 to complete the heating of the battery pack, and then returns to the first coolant one-way valve 10 to complete the cycle.

[0133] Embodiment 13: In a dual heating condition when the air source heat pump is unavailable in cold regions and only the water source heat pump is available, the outlet water temperature of the heater core 12 is higher than the acceptable threshold of the inlet water temperature of the battery pack 18, and the outlet water of the battery pack 18 needs to be partially mixed into its water inlet.

[0134] The multi-way valve 19 is in mode 6, the connected state is interface one through interface eight, interface two through interface nine, interface three, interface four, interface five, interface six mixed water, interface seven cut-off, and the coolant three-way valve 27 state is a through c.

[0135] The second electronic water pump 7 is running, the second coolant one-way valve 11 is turned on, and the coolant flows through the two-in-one module 16 and the electric drive assembly 17 (the coolant can be heated by heat generation, such as Figure 2 system), takes away the heat and enters the second heat exchanger 3, where it returns to the second coolant one-way valve 11 after heat exchange, completing the cycle.

[0136] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4, and exchanges heat with the coolant flowing through the second heat exchanger 3. The refrigerant absorbs heat from the coolant, and the coolant releases heat. The refrigerant after flowing through the second heat exchanger 3 enters the compressor suction port to complete the cycle. The refrigerant flows to Figure 3 shown.

[0137] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, and the coolant flowing through the first heat exchanger 2 exchanges heat with the refrigerant from the exhaust port of the compressor 1, the coolant absorbs heat, and the refrigerant releases heat, and then the coolant flows through the water heater 27 (which can work to assist in heating the coolant, such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 The system) uses the blower 14 to take in air, so that the air and the heater core 12 undergo heat exchange and absorb heat, while the coolant releases heat, thereby completing the heating of the passenger compartment.

[0138] At this time, interface four and interface six of the multi-way valve 19 are connected to interface three and interface five. The coolant after flowing through the heater core 12 enters interface four of the multi-way valve 19 and is then diverted to interface three and interface five. The third electronic water pump 8 is running, and the coolant flows through port a to port c of the coolant three-way valve 5 and enters the battery pack 18. Then the coolant enters interface six of the multi-way valve 19 and is diverted to interface three and interface five. Part of the outlet coolant of the battery pack 18 and part of the coolant flowing through the heater core 12 are mixed at interface five and then returned to the water inlet of the battery pack 18, completing the heating of the battery pack 18 and controlling its water inlet temperature within the required temperature. At the same time, part of the outlet water of the battery pack 18 is mixed at interface six of the multi-way valve 19 with the coolant flowing through the heater core 12 and diverted to interface four and returned to the first coolant one-way valve 10, completing the water circuit circulation.

[0139] Embodiment 14: Heating condition of a single passenger cabin when the air source heat pump is unavailable in cold regions and only the water source heat pump is available.

[0140] The multi-way valve 19 is in mode 7, the connected state is interface one through interface eight, interface two through interface nine, interface three through interface four, interface five through interface six, interface seven is cut off, and the state of the coolant three-way valve 5 is a through c.

[0141] The second electronic water pump 7 is running, the second coolant one-way valve 11 is turned on, and the coolant flows through the two-in-one module 16 and the electric drive assembly 17 (the coolant can be heated by heat generation, such as Figure 2 system), takes away the heat and enters the second heat exchanger 3, where it returns to the second coolant one-way valve 11 after heat exchange, completing the cycle.

[0142] The refrigerant on the exhaust side of the compressor 1 flows through the first heat exchanger 2 in turn to release heat to the coolant and the liquid storage dryer 24, and enters the second heat exchanger 3 after being throttled by the first electronic expansion valve 4, and exchanges heat with the coolant flowing therein. The refrigerant absorbs heat from the coolant, and the coolant releases heat. The refrigerant after flowing through the second heat exchanger 3 enters the compressor suction port to complete the cycle. The refrigerant flows to Figure 3 shown.

[0143] The first electronic water pump 6 is running, the first coolant one-way valve 10 is turned on, the coolant flowing through the first heat exchanger 2 exchanges heat with the refrigerant from the exhaust port of the compressor 1, the coolant absorbs heat, the refrigerant releases heat, and then the coolant flows through the water heater 27 (which can work to assist in heating the coolant, such as Figure 1 system) or directly into the warm air core 12 (such as Figure 2 The system) uses the blower 14 to intake air so that the air exchanges heat with the heater core 12 to absorb heat, and the coolant releases heat, thereby completing the heating of the passenger compartment.

[0144] If the battery pack 18 has a requirement for temperature equalization at this time, the third electronic water pump 8 will be operated.

[0145] If the battery pack 18 has no temperature equalization requirement at this time, the third electronic water pump 8 stops.

[0146] In summary, the secondary heat exchange heat pump type thermal management system and thermal management method of the present invention are innovatively designed to address the deficiencies of the prior art, and show significant advantages in energy recovery and utilization, refrigeration and heating performance, and system adaptability, effectively improving the comprehensive performance of the thermal management system.

[0147] It should be noted here that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the present invention is limited only by the scope of the claims. In the case of using "including", "having" and "comprising" described in this specification, there may also be another part or other parts, and the terms used may generally be singular but may also represent plural forms.

[0148] Finally, it should be pointed out that the above embodiments are only representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention should be considered to belong to the protection scope of the present invention.

Claims

1. A secondary heat exchange heat pump type thermal management system, comprising a heating, ventilation and air conditioning assembly (20), which includes a cold air core (13) and a warm air core (12), characterized in that: It also includes a multi-way valve (19) having at least nine interfaces, a cooling liquid circuit connected to the nine different interfaces of the multi-way valve (19), and a refrigerant circuit capable of performing heat exchange with the cooling liquid circuit; The nine interfaces include interfaces 1 to 9; the coolant circuit includes an electric drive circuit (300), a heat dissipation circuit (400), a battery circuit (500), a coupling circuit (600) connecting the electric drive circuit (300) and the heat dissipation circuit (400) to the multi-way valve (19), a first heat exchange coolant circuit (700) connected to the heater core (12) and the first heat exchanger (2), a second heat exchange coolant circuit (800) connected to the second heat exchanger (3), and a second heat exchange coolant circuit (900) connected to the second heat exchanger (3). and a cold air core circuit (900) connected to the battery circuit (500) and the cold air core (13); the coolant can be introduced into the battery pack (18) of the battery circuit (500) and the cold air core circuit (900) according to a set ratio through a coolant three-way valve (5); the refrigerant circuit includes a refrigerant pipeline (100), and the compressor (1), the first heat exchanger (2) and the second heat exchanger (3) are connected in series through the refrigerant pipeline (100); The multi-way valve (19) can realize the circulation flow of various cooling liquids by controlling the mutual connection or cutoff between various interfaces, and realize the control and switching of various thermal management through the heat exchange between the cooling liquid circuit and the refrigerant circuit.

2. The secondary heat exchange heat pump type thermal management system according to claim 1, characterized in that: One end of the electric drive circuit (300), one end of the heat dissipation circuit (400) and one end of the coupling circuit (600) are respectively connected to any three different interfaces among the interfaces 1 to 9; both ends of the battery circuit (500), both ends of the first heat exchange coolant circuit (700) and both ends of the second heat exchange coolant circuit (800) are all connected to any two interfaces among the remaining six interfaces among the interfaces 1 to 9, and both ends of the battery circuit (500), both ends of the first heat exchange coolant circuit (700) and both ends of the second heat exchange coolant circuit (800) are connected to six different interfaces.

3. The secondary heat exchange heat pump type thermal management system according to claim 1, characterized in that: The electric drive circuit (300) comprises a coolant pipeline (200) connected to the interface 8 at one end, the coolant pipeline (200) connected to the interface 8 is connected to the electric drive assembly (17) and the two-in-one module (16), and the other end of the coolant pipeline (200) connected to the interface 8 is connected to the coupling circuit (600); The heat dissipation circuit (400) comprises a coolant pipeline (200) connected to the interface 7 at one end, a radiator (15) and a heat dissipation fan (9) are connected to the coolant pipeline (200) connected to the interface 7, and the other end of the coolant pipeline (200) connected to the interface 7 is connected to the coupling circuit (600); The battery circuit (500) comprises a coolant pipeline (200) whose two ends are respectively connected to the interface five and the interface six, and the coolant pipeline (200) connected between the interface five and the interface six is ​​connected to the battery pack (18) and the coolant three-way valve (5); The cold air core circuit (900) comprises a coolant pipeline (200) whose two ends are respectively connected to the coolant three-way valve (5) and the coolant outlet of the battery pack (18), and the cold air core (13) is connected to the coolant pipeline; The coupling circuit (600) comprises a cooling liquid pipeline (200) having one end connected to the interface nine, and the other end of the cooling liquid pipeline (200) connected to the interface nine is in communication with the electric drive circuit (300) and the heat dissipation circuit (400); The first heat exchange coolant circuit (700) comprises a coolant pipeline (200) with two ends respectively connected to interface three and interface four, and the heater core (12) and the first heat exchanger (2) are both connected to the coolant pipeline (200) between interface three and interface four; The second heat exchange coolant circuit (800) comprises a coolant pipeline (200) with two ends respectively connected to interface 1 and interface 2, and the second heat exchanger (3) is connected to the coolant pipeline (200) between interface 1 and interface 2.

4. The secondary heat exchange heat pump type thermal management system according to claim 3, characterized in that: The first heat exchange coolant circuit (700) further includes a water heater (27) connected to the coolant pipeline (200) between the interface three and the interface four.

5. A thermal management method based on the secondary heat exchange heat pump type thermal management system according to any one of claims 1 to 4, characterized in that: It includes a coolant circuit thermal management method and a refrigerant circuit thermal piping method; The coolant circuit thermal management method includes a single-circuit coolant thermal management method for individually controlling one or more of the coolant circuits and a combined-circuit coolant thermal management method for connecting any at least two of the coolant circuits to form at least one circulating coolant circuit; The refrigerant circuit thermal management method comprises a refrigerant series circuit thermal management method that connects the compressor (1) with the first heat exchanger (2) and the second heat exchanger (3).

6. The thermal management method based on the secondary heat exchange heat pump type thermal management system according to claim 5, characterized in that: The single-circuit coolant thermal management method includes a single battery circuit thermal management method, a single first heat exchange coolant circuit thermal management method and a single cold air core circuit thermal management method; The single battery circuit thermal management method comprises: connecting the water inlet and the water outlet of the battery circuit (500) through a multi-way valve (19), and at the same time, introducing the coolant into the battery pack (18) through a coolant three-way valve (5), so that the coolant flows through the battery pack (18), and uniformly controlling the temperature of the battery pack (18); The single first heat exchange coolant loop thermal management method comprises: connecting the water inlet and the water outlet of the first heat exchange coolant loop (700) through a multi-way valve (19), allowing the coolant to pass through the first heat exchanger (2) and perform heat exchange with the refrigerant in the first heat exchanger (2), so that the coolant flowing through the first heat exchanger (2) absorbs heat; The single cold air core circuit thermal management method comprises: connecting the water inlet and outlet of the battery circuit (500) through a multi-way valve (19); at the same time, introducing the coolant into the cold air core (13) through a coolant three-way valve (5); when the air passes through the cold air core (13) and is blown into the passenger compartment, cooling or dehumidifying the passenger compartment can be achieved.

7. The thermal management method based on the secondary heat exchange heat pump type thermal management system according to claim 5, characterized in that: The combined circuit coolant heat pipe method comprises a first combined circuit heat management method for combining the electric drive circuit (300), the heat dissipation circuit (400), the coupling circuit (600) and the first heat exchange coolant circuit (700) and performing heat management control; a second combined circuit heat management method for combining the second heat exchange coolant circuit (800) and the battery circuit (500) and performing heat management control; a third combined circuit heat management method for combining the battery circuit (500) and the first heat exchange coolant circuit (700) and performing heat management control; and a fourth combined circuit heat management method for combining the electric drive circuit (300), the heat dissipation circuit (400) and the first heat exchange coolant circuit (700). A fourth combined circuit thermal management method for combining the electric drive circuit (300), the coupling circuit (600) and the second heat exchange coolant circuit (800) and performing thermal management control; a fifth combined circuit thermal management method for combining the electric drive circuit (300), the coupling circuit (600) and the second heat exchange coolant circuit (800) and performing thermal management control; a sixth combined circuit thermal management method for combining the cold air core circuit (900) and the second heat exchange coolant circuit (800) and performing thermal management control; and a seventh combined circuit thermal management method for combining the battery circuit (500), the cold air core circuit (900) and the second heat exchange coolant circuit (800) and performing thermal management control.

8. The thermal management method based on the secondary heat exchange heat pump type thermal management system according to claim 7, characterized in that: The first combined circuit thermal management method comprises: connecting the water outlet of the electric drive circuit (300) with the water inlet of the heat dissipation circuit (400) through a multi-way valve (19), connecting the water inlet of the first heat exchange coolant circuit (700) with the water outlet of the coupling pipeline (600), and connecting the water outlet of the first heat exchange coolant circuit (700) with the water inlet of the heat dissipation circuit (400); when the coolant flows through the electric drive circuit (300), the electric drive assembly (17) can be cooled; when the coolant flows through the heat dissipation circuit (400), the coolant can dissipate heat or simultaneously de-ice the radiator (15); when the coolant flows through the heater core (12) in the first heat exchange coolant circuit (700), the air can be heated to achieve dehumidification or heating of the passenger compartment; when the coolant flows through the coupling circuit, the coolant can enter the first heat exchange coolant circuit (700) through the coupling circuit (600); The second combined circuit thermal management method comprises: connecting the water inlet of the battery circuit (500) to the water outlet of the second heat exchange cooling liquid circuit (800) through a multi-way valve (19), and connecting the water outlet of the battery circuit (500) to the water inlet of the second heat exchange cooling liquid circuit (800); when the coolant flows through the battery circuit (500), the battery pack (18) can be cooled or the temperature of the battery pack (18) can be uniformly controlled; when the coolant flows through the second heat exchange cooling liquid circuit (800), heat exchange can be performed with the refrigerant in the second heat exchanger (3), so that the coolant flowing through the second heat exchanger (3) releases heat; The third combined circuit thermal management method comprises: connecting the water inlet of the battery circuit (500) to the water outlet of the first heat exchange coolant circuit (700) through a multi-way valve (19), and connecting the water outlet of the battery circuit (500) to the water inlet of the first heat exchange coolant circuit (700); when the coolant flows through the battery circuit (500), the battery pack (18) can be heated, and when the coolant flows through the first heat exchange coolant circuit (700), the passenger compartment can be heated; The fourth combined circuit thermal management method comprises: connecting the water outlet of the electric drive circuit (300) to the water inlet of the second heat exchange coolant circuit (800) through a multi-way valve (19), connecting the water inlet of the heat dissipation circuit (400) to the water outlet of the second heat exchange coolant circuit (800), and cutting off the interface connected to the coupling pipeline (600); when the coolant flows through the electric drive circuit (300), the electric drive assembly (17) can be cooled; when the coolant flows through the heat dissipation circuit (400), the coolant can absorb heat; when the coolant flows through the second heat exchange coolant circuit (800), the coolant can exchange heat with the refrigerant in the second heat exchanger (3), so that the coolant flowing through the second heat exchanger (3) releases heat; The fifth combined circuit thermal management method comprises: connecting the water outlet of the electric drive circuit (300) to the water inlet of the second heat exchange coolant circuit (800) through a multi-way valve (19), connecting the water outlet of the second heat exchange coolant circuit (800) to the water inlet of the coupling circuit (600), and cutting off the interface connected to the heat dissipation circuit (400); when the coolant flows through the electric drive circuit (300), the electric drive assembly (17) can be cooled; when the coolant flows through the coupling circuit (600), the coolant can be introduced into the electric drive circuit (300) through the coupling circuit (600); when the coolant flows through the second heat exchange coolant circuit (800), heat exchange can be performed with the refrigerant in the second heat exchanger (3), so that the coolant flowing through the second heat exchanger (3) releases heat; The sixth combined circuit thermal management method comprises: connecting the water inlet of the battery circuit (500) with the water outlet of the second heat exchange cooling liquid circuit (800) through a multi-way valve (19), and connecting the water outlet of the battery circuit (500) with the water inlet of the second heat exchange cooling liquid circuit (800); when the cooling liquid flows through the battery circuit (500), the cooling liquid is introduced into the cold air core circuit (900) through a cooling liquid three-way valve (5); when the cooling liquid flows through the cold air core (13), the passing air can be cooled; when the cooling liquid flows through the second heat exchange cooling liquid circuit (800), the cooling liquid can exchange heat with the refrigerant in the second heat exchanger (3), so that the cooling liquid flowing through the second heat exchanger (3) releases heat; The seventh combined circuit thermal management method comprises: connecting the water inlet end of the battery circuit (500) with the water outlet end of the second heat exchange cooling liquid circuit (800) through a multi-way valve (19), and connecting the water outlet end of the battery circuit (500) with the water inlet end of the second heat exchange cooling liquid circuit (800); when the coolant flows through the battery circuit (500), the coolant is introduced into the battery pack (18) and the cold air core circuit (900) according to a set ratio through the coolant three-way valve (5), so as to cool the battery pack (18) or achieve uniform temperature control of the battery pack (18); when the coolant flows through the cold air core (13), the passing air can be cooled; when the coolant flows through the second heat exchange cooling liquid circuit (800), the coolant can exchange heat with the refrigerant in the second heat exchanger (3), so that the coolant flowing through the second heat exchanger (3) releases heat.

9. The thermal management method based on the secondary heat exchange heat pump type thermal management system according to claim 7, characterized in that: The third combined circuit thermal management method comprises: connecting the water inlet end of the battery circuit (500) to the water outlet end of the first heat exchange coolant circuit (700) through a multi-way valve (19), connecting the water outlet end of the battery circuit (500) to the water inlet end of the first heat exchange coolant circuit (700), connecting the water inlet end of the battery circuit (500) to the water outlet end, and connecting the water inlet end of the first heat exchange coolant circuit (700) to the water outlet end; when the coolant flows through the battery circuit (500), the battery pack (18) can be heated, and when the coolant flows through the first heat exchange coolant circuit (700), the passenger compartment can be heated.

10. The thermal management method based on the secondary heat exchange heat pump type thermal management system according to claim 5, characterized in that: The refrigerant series circuit thermal management method comprises: starting the compressor (1), the refrigerant on the exhaust side of the compressor (1) passing through the first heat exchanger (2) and the second heat exchanger (3) in sequence, the refrigerant releasing heat through the first heat exchanger (2), absorbing heat through the cooling liquid of the first heat exchanger (2), absorbing heat through the second heat exchanger (3), and releasing heat through the cooling liquid of the second heat exchanger (3).

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