An indirect heat exchange thermal management system and method based on eight-way and five-way water valves

Abstract

The application discloses an indirect heat exchange thermal management system based on eight-way and five-way water valves, which comprises a refrigerant circuit, an eight-way water valve and a five-way water valve; the refrigerant circuit is composed of a compressor, a water-cooled condenser, a liquid storage tank, a throttling expansion valve and a plate evaporator; the output end of the compressor is connected with the refrigerant input end of the water-cooled condenser; the refrigerant output end of the water-cooled condenser is connected with the refrigerant input end of the plate evaporator through the liquid storage tank and the throttling expansion valve; and the refrigerant output end of the plate evaporator is connected with the input end of the compressor; the indirect heat exchange thermal management system solves the problems of smooth switching of the flow direction of various modes of cold carrier, adjustment and distribution of flow, is rich in functions, is small in integrated design volume with the refrigerant valve island, can adjust the flow direction and flow distribution of the cold carrier through the rotary water valve to meet the functions of the refrigerant circuit, such as refrigeration, heating, dehumidification, battery heating, forced cooling of the battery, low-temperature heat dissipation of the battery, self-circulation of the battery temperature equalization, waste heat recovery and the like; the eight-way valve is used for connecting the thermal management system into a whole, can effectively transport the energy of each circuit to a suitable place, reduces energy loss, and prolongs the cruising range of the vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicle thermal management system, in particular to a new energy vehicle indirect heat exchange thermal management system and method based on eight-way and five-way water valves. BACKGROUND

[0002] Currently, the thermal management system of new energy vehicles mainly uses R134a and R1234yf as refrigerants, wherein the ODP value of R134a is 0, but the GWP value is 1300; the ODP value of R1234yf is 0, and the GWP value is 4, but such refrigerant is very expensive and is not convenient for popularization; R134a will be gradually replaced under the control of the Kigali Amendment, and the currently available alternative refrigerant is mainly R744 and R290. The ODP value of R744 is 0, and the GWP value is 1. The ODP value of R290 is 0, and the GWP value is 3.3. Since the R744 system operates at a relatively high pressure, it requires high-quality system components and is difficult to develop, so the system using R290 is relatively easier to implement on new energy vehicles, but R290 also has the disadvantage of being flammable and explosive, and the charge amount needs to be controlled within a certain range. The existing R290 system for vehicles generally uses a secondary heat exchanger with a coolant, but the coolant system is relatively complex and has a single function. The present application uses an eight-way water valve and a water valve to solve the smooth switching of the flow direction of the coolant in various modes, and integrates with the refrigerant valve island to have a small size and rich functions, and solves the switching of the flow direction of the coolant. The current R290 thermal management system has poor heating capacity at low temperature, and usually needs to use WPTC (water heating type positive temperature coefficient thermistor heating system) to improve the heating capacity.

[0003] To solve the above problems, the indirect heat exchange thermal management system proposed by the present application solves the smooth switching of the flow direction of the coolant in various modes, the regulation and distribution of the flow, and has rich functions. The system is integrated with the refrigerant valve island and has a small size. The flow direction and flow distribution of the coolant can be adjusted by rotating the water valve to meet the functions of refrigeration, heating, dehumidification, battery heating, battery forced cooling, battery low-temperature heat dissipation, battery temperature equalization self-circulation, waste heat recovery, etc. The eight-way valve connects the thermal management system into a whole, which can effectively transport the energy of each circuit to the appropriate place to reduce energy loss and prolong the cruising range of the vehicle. The hot gas bypass circulation proposed by the present application can improve the heating capacity at low temperature, and can meet the heating demand without WPTC, which can reduce the manufacturing cost and carbon emissions. SUMMARY

[0004] The present application aims to provide an indirect heat exchange thermal management system and method based on eight-way and five-way water valves to overcome the shortcomings of the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] The application discloses an indirect heat exchange heat management system based on an eight-way water valve and a five-way water valve, comprising a refrigerant circuit comprising an eight-way water valve and a five-way water valve;

[0007] The refrigerant circuit is composed of a compressor, a water-cooled condenser, a liquid storage tank, a throttling expansion valve and a plate evaporator, the output end of the compressor is connected to the refrigerant input end of the water-cooled condenser, the refrigerant output end of the water-cooled condenser is connected to the refrigerant input end of the plate evaporator through the liquid storage tank and the throttling expansion valve, and the refrigerant output end of the plate evaporator is connected to the input end of the compressor;

[0008] The eight-way water valve comprises eight valve ports a-h, wherein the a valve port of the eight-way water valve is connected to the input end of an electric drive assembly, the b valve port is connected to the input end of a power battery, the c valve port is connected to the h valve port, the d valve port is connected to the input end of an air conditioner heating core, the e valve port is connected to the output end of the water-cooled condenser, the f valve port is connected to the input end of a front-end radiator, the g valve port is connected to the output end of the plate evaporator, the h valve port is connected to the c valve port and the input end of an air conditioner refrigerator, and the five-way water valve comprises five valve ports 1, 2a, 2b, 3 and 4, wherein the 1 valve port of the five-way water valve is connected to the input end of the water-cooled condenser, the 2a valve port is connected to the output end of the power battery, the 2b valve port is connected to the output end of the air conditioner refrigerator, the 3 valve port is connected to the input end of the plate evaporator, and the 4 valve port is connected to the output end of the electric drive assembly;

[0009] The output end of the front-end radiator is connected to the input end of the electric drive assembly, and the output end of the air conditioner heating core is connected to the input end of the water-cooled condenser;

[0010] The a valve port of the eight-way water valve is connected to the b, c, d, e and h valve ports, respectively; the f valve port is connected to the g, h, b, c, d and e valve ports, respectively; the b valve port is connected to the a, c, d, e and f valve ports, respectively; the c valve port is connected to the a, b, d, e and f valve ports, respectively; the d valve port is connected to the a, b, c, e and f valve ports; the e valve port is connected to the a, b, c, d and f valve ports, respectively; the g valve port is connected to the h, a and f valve ports; and the h valve port is connected to the a, f and g valve ports, respectively.

[0011] The 1 valve port of the five-way water valve is connected to the 2a, 2b and 4 valve ports, respectively; the 2a valve port is connected to the 1 and 3 valve ports, respectively; the 2b valve port is connected to the 1 and 3 valve ports, respectively; the 3 valve port is connected to the 2a, 2b and 4 valve ports, respectively.

[0012] The refrigerant input end of the plate evaporator is provided with a refrigeration water pump; the refrigerant input end of the water-cooled condenser is provided with a heating water pump; and the input end of the power battery is provided with a battery water pump.

[0013] The application also discloses a natural cooling method of an indirect heat exchange thermal management system based on an eight-way and five-way water valve

[0014] The electric drive electric control heat dissipation method specifically comprises the following steps:

[0015] A1, opening the passage between the 4 valve port and the 3 valve port of the five-way water valve and opening the passage between the g valve port and the f valve port of the eight-way water valve;

[0016] A2, after the vehicle is started, the temperature of the cold carrier that absorbs heat in the electric drive assembly is increased, then the cold carrier flows out from the 4 valve port of the five-way water valve through the 3 valve port, enters the refrigeration water pump, passes through the plate evaporator, then flows into the f valve port from the g valve port of the eight-way water valve, flows out, then enters the front end heat exchanger, releases heat to the atmosphere, and then returns to the electric drive assembly;

[0017] The battery module temperature equalization self-circulation method specifically comprises the following steps:

[0018] B1, opening the passage between the 4 valve port and the 3 valve port of the five-way water valve and opening the passage between the g valve port and the a valve port of the eight-way water valve;

[0019] B2, after the vehicle is started, the temperature of the cold carrier that absorbs heat in the electric drive assembly is increased, then the cold carrier flows out from the 4 valve port of the five-way water valve through the 3 valve port, enters the refrigeration water pump, passes through the plate evaporator, then flows into the a valve port from the g valve port of the eight-way water valve, flows out, and then returns to the electric drive assembly;

[0020] B3, self-circulation is performed between the power battery and the battery water pump;

[0021] The battery low-temperature heat dissipation method specifically comprises the following steps:

[0022] C1, opening the passage between the 2a valve port and the 3 valve port of the five-way water valve and the passage between the 4 valve port and the 1 valve port, and opening the passage between the g valve port and the f valve port of the eight-way water valve and the passage between the e valve port and the b valve port;

[0023] C2, after the vehicle is started, the temperature of the cold carrier that absorbs heat in the power battery assembly is increased, then the cold carrier flows out from the 2a valve port of the five-way water valve through the 3 valve port, enters the refrigeration water pump, passes through the plate evaporator, then flows into the f valve port from the g valve port of the eight-way water valve, flows out, then enters the front end evaporator, releases heat, and then the temperature is reduced;

[0024] C3, after absorbing heat in the electric drive assembly, the cold carrier enters the 4 valve port of the five-way water valve again, flows out from the 1 valve port, enters the heating water pump, passes through the water-cooled condenser again, then enters the e valve port of the eight-way water valve, flows out from the b valve port, enters the battery water pump, and then returns to the power battery.

[0025] The application also discloses a waste heat recovery method of an indirect heat exchange thermal management system based on an eight-way and five-way water valve, including a waste heat recovery method, an electric drive electric control waste heat recovery method and an electric drive battery heating method; the waste heat recovery method includes the following steps:

[0026] D1, after the compressor is started, low-temperature and low-pressure refrigerant vapor is sucked into the compressor and compressed into high-temperature and high-pressure refrigerant vapor, which is discharged to a water-cooled condenser to release heat and condensed into normal-temperature and high-pressure liquid refrigerant, and the heat is transferred to the heat carrier of the water-cooled condenser;

[0027] D2, the passage between the e valve port and the d valve port and the passage between the e valve port and the b valve port of the eight-way water valve are opened; the heat carrier of the water-cooled condenser flows into the e valve port of the eight-way water valve and is divided into two paths, one of which flows out from the d port and then enters an air conditioning core to release heat to air in the passenger cabin and then flows into the water-cooled condenser again through a heating water pump; the other path flows out from the b port, enters a power battery through a battery water pump and then flows into the water-cooled condenser again through the heating water pump;

[0028] D3, the normal-temperature and high-pressure liquid refrigerant in step D1 enters a throttling expansion valve through a liquid storage tank to become low-temperature and low-pressure gas-liquid two-phase refrigerant, then enters a plate evaporator to absorb heat of the heat carrier of the plate evaporator, gasifies into low-temperature and low-pressure gaseous refrigerant and returns to the compressor;

[0029] D4, the passage between the g valve port and the a valve port of the eight-way water valve is opened, the passage between the 4 valve port and the 3 valve port of the five-way water valve is opened, the heat carrier of the plate evaporator enters the a valve port of the eight-way water valve through the g valve port, flows out from the a valve port, absorbs heat through an electric drive assembly, then flows into the 4 valve port of the five-way water valve, flows out from the 3 valve port, enters a refrigeration water pump and returns to the plate evaporator;

[0030] The electric drive electric control waste heat recovery method includes the following steps:

[0031] E1, after the compressor is started, low-temperature and low-pressure refrigerant vapor is sucked into the compressor and compressed into high-temperature and high-pressure refrigerant vapor, which is discharged to a water-cooled condenser to release heat and condensed into normal-temperature and high-pressure liquid refrigerant, and the heat is transferred to the heat carrier of the water-cooled condenser;

[0032] E2, the passage between the e valve port and the b valve port of the eight-way water valve is opened; the heat carrier of the water-cooled condenser enters a power battery through a battery water pump and then returns to the water-cooled condenser through a heating water pump;

[0033] E3, the normal-temperature and high-pressure liquid refrigerant in step E1 enters a throttling expansion valve through a liquid storage tank to become low-temperature and low-pressure gas-liquid two-phase refrigerant, then enters a plate evaporator to absorb heat of the heat carrier of the plate evaporator, gasifies into low-temperature and low-pressure gaseous refrigerant and returns to the compressor;

[0034] E4, open the passage between the g valve port and the a valve port of the eight-way water valve, and open the passage between the 4 valve port and the 3 valve port of the five-way water valve; the refrigerant of the plate evaporator flows out from the a valve port of the eight-way water valve through the g valve port, and then flows into the refrigeration water pump from the 3 valve port through the five-way water valve after absorbing heat by the electric drive assembly;

[0035] The electric drive heating battery method specifically comprises the following steps:

[0036] F1, open the passage between the 2a valve port and the 3 valve port of the five-way water valve and the passage between the 4 valve port and the 1 valve port; open the passage between the g valve port and the f valve port of the eight-way water valve and the passage between the e valve port and the b valve port;

[0037] F2, after the vehicle is started, the refrigerant enters the electric drive assembly to absorb heat and the temperature rises, then flows into the heating water pump through the 1 valve port of the five-way water valve from the 4 valve port, passes through the water-cooled condenser, and then flows into the a valve port of the eight-way water valve from the e valve port, and then enters the power battery after the pressure head is raised by the battery water pump;

[0038] F3, the refrigerant with a decreased temperature flows into the 3 valve port of the five-way water valve from the 2a valve port, flows out and then enters the refrigeration water pump, and then enters the eight-way water valve from the g valve port after passing through the plate evaporator, and flows out from the a valve to return to the electric drive assembly.

[0039] The beneficial effects of the present application are as follows:

[0040] 1. The indirect heat exchange heat management system solves the problems of smooth switching of the flow direction of various mode refrigerants, flow regulation and distribution; it is rich in functions; it is small in size when integrated with the refrigerant valve island; it can adjust the flow direction and flow distribution of the refrigerant through the rotary water valve to meet the functions of the refrigeration, heating, dehumidification, battery heating, battery forced cooling, battery low-temperature heat dissipation, battery temperature equalization self-circulation, waste heat recovery and the like; the heat management system is connected as a whole through the eight-way valve, which can effectively transport the energy of each circuit to the appropriate place to reduce energy loss and prolong the cruising range of the vehicle; the hot gas bypass circulation can improve the heating capacity under low-temperature working conditions, and the heating demand can be met without WPTC, which can reduce the manufacturing cost and carbon emissions.

[0041] 2. The present application can isolate R290 refrigerant from the passenger compartment, integrate R290 heat pump with the valve island to minimize the refrigerant charge, and reduce the risk of flammability and explosiveness; the indoor refrigerator and the front evaporation and heat exchanger pipe are both low-pressure refrigerants, which can reduce the cost of parts; compared with the traditional heat pump waste heat recovery, the safety factor and COP are improved, and it is more environmentally friendly and energy-saving;

[0042] 3、The 8-way water valve proposed in the application can realize the following functions: a port can form 6 paths with b port, c port, d port, e port, g port and h port; f port can also form 6 paths with g port, h port, b port, c port, d port and e port; b port can form 5 paths with a port, c port, d port, e port and f port; c port can form 5 paths with a port, b port, d port, e port and f port; d port can form 5 paths with a port, b port, c port, e port and f port; e port can form 5 paths with a port, b port, c port, d port and f port; g port can form 3 paths with h port, a port and f port; h port can form 3 paths with a port, f port and g port, and a total of 19 paths are contained, which can reduce the number of water valves, improve system integration, reduce the size of parts and reduce costs; and energy scheduling of a conventional heat pump and an electric drive battery heat system can be realized.

[0043] 4、Compared with the existing indirect heat exchange thermal management system, the indirect heat exchange thermal management system proposed in the application has an additional hot gas bypass circuit when the hot gas bypass heating method is used, and the heating capacity of the system at low ambient temperature can be improved; the specific principle is that when the ambient temperature is low, the evaporation pressure of the heat pump system decreases, and the corresponding evaporation temperature decreases; at this time, the specific volume of the refrigerant increases, the mass of the refrigerant compressed by the compressor per unit time decreases rapidly, that is, the mass flow decreases rapidly, the enthalpy of the unit mass of the refrigerant increases, and the exhaust temperature of the compressor rises rapidly, but the heating capacity decreases; this is because the heating capacity is the product of the mass flow and the enthalpy of the refrigerant, and one of the multipliers decreases rapidly and the other increases slightly, resulting in a decrease in the product of the two, that is, the heating capacity decreases. The low-pressure high-temperature refrigerant mixed by the bypass valve and the low-temperature low-pressure refrigerant returned by the electronic expansion valve reduces the specific volume of the refrigerant, improves the mass flow of the refrigerant passing through the compressor, and improves the compression power of the compressor, thereby improving the heating capacity.

[0044] 5、The water loop of the application can realize single-occupant cabin refrigeration, occupant cabin and battery hybrid refrigeration, occupant cabin heating and dehumidification, occupant cabin heat pump heating, battery forced cooling, normal operation of these modes by using only 2 main water pumps and 1 battery loop compensation water pump, and the power is smaller and the cost is lower than that of other indirect heat exchange systems which need to use 3 main water pumps.

[0045] The features and advantages of the application will be described in detail in conjunction with the embodiments and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 is a structure schematic diagram of a new energy automobile indirect heat exchange thermal management system based on an eight-way and five-way water valve;

[0047] Figure 2 is a running schematic diagram of a single-occupant cabin refrigeration mode of an embodiment of the application;

[0048] Figure 3 is a running schematic diagram of a battery forced cooling mode of an embodiment of the present application;

[0049] Figure 4 is a running schematic diagram of a battery forced cooling mode of an embodiment of the present application;

[0050] Figure 5 is a running schematic diagram of a passenger cabin heating and dehumidifying mode of an embodiment of the present application;

[0051] Figure 6 is a running schematic diagram of a passenger cabin heating and dehumidifying mode of an embodiment of the present application;

[0052] Figure 7 is a running schematic diagram of a passenger cabin heating and dehumidifying mode of an embodiment of the present application;

[0053] Figure 8 is a running schematic diagram of a battery heating mode of an embodiment of the present application;

[0054] Figure 9 is a running schematic diagram of a battery heating mode of an embodiment of the present application;

[0055] Figure 10 is a running schematic diagram of a battery heating mode of an embodiment of the present application;

[0056] Figure 11 is a running schematic diagram of a battery heating mode of an embodiment of the present application;

[0057] Figure 12 is a running schematic diagram of a battery heating mode of an embodiment of the present application;

[0058] Figure 13 is a running schematic diagram of a battery heating mode of an embodiment of the present application;

[0059] Figure 14 is a running schematic diagram of a battery heating mode of an embodiment of the present application. DETAILED DESCRIPTION

[0060] In order to make the objects, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application by means of the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the scope of the present application. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0061] Referring to Figure 1 , the embodiment of the present application provides a new energy vehicle indirect heat exchange thermal management system based on eight-way and five-way water valves, which comprises a refrigerant circuit, and comprises an eight-way water valve and a five-way water valve.

[0062] The refrigerant circuit is composed of a compressor, a water-cooled condenser, a liquid storage tank, a throttling expansion valve and a plate evaporator, an output end of the compressor is connected to a refrigerant input end of the water-cooled condenser, a refrigerant output end of the water-cooled condenser is connected to a refrigerant input end of the plate evaporator through the liquid storage tank and the throttling expansion valve, and a refrigerant output end of the plate evaporator is connected to an input end of the compressor.

[0063] The eight-way water valve includes a total of eight valve ports a-h, wherein the a valve port of the eight-way water valve is connected to an input end of the electric drive assembly, the b valve port is connected to an input end of the power battery, the c valve port is connected to the h valve port, the d valve port is connected to an input end of the air conditioner heating core, the e valve port is connected to a coolant output end of the water-cooled condenser, the f valve port is connected to an input end of the front-end radiator, the g valve port is connected to a coolant output end of the plate evaporator, the h valve port is connected to the c valve port and an input end of the air conditioner refrigeration device; the five-way water valve includes a total of five valve ports 1, 2a, 2b, 3 and 4, wherein the 1 valve port of the five-way water valve is connected to a coolant input end of the water-cooled condenser, the 2a valve port is connected to an output end of the power battery, the 2b valve port is connected to an output end of the air conditioner refrigeration device, the 3 valve port is connected to a coolant input end of the plate evaporator, and the 4 valve port is connected to an output end of the electric drive assembly.

[0064] An output end of the front-end radiator is connected to an input end of the electric drive assembly, and an output end of the air conditioner heating core is connected to a coolant input end of the water-cooled condenser.

[0065] In a feasible embodiment, the a valve port of the eight-way water valve forms a passage with the b, c, d, e, g and h valve ports respectively; the f valve port forms a passage with the g, h, b, c, d and e valve ports respectively; the b valve port forms a passage with the a, c, d, e and f valve ports respectively; the c valve port forms a passage with the a, b, d, e and f valve ports respectively; the d valve port forms a passage with the a, b, c, e and f valve ports; the e valve port forms a passage with the a, b, c, d and f valve ports respectively; the g valve port forms a passage with the h, a and f valve ports; and the h valve port forms a passage with the a, f and g valve ports respectively.

[0066] In a feasible embodiment, the 1 valve port of the five-way water valve forms a passage with the 2a, 2b and 4 valve ports respectively; the 2a valve port forms a passage with the 1 and 3 valve ports respectively; the 2b valve port forms a passage with the 1 and 3 valve ports respectively; and the 3 valve port forms a passage with the 2a, 2b and 4 valve ports.

[0067] In a feasible embodiment, a coolant input end of the plate evaporator is provided with a refrigeration water pump; a coolant input end of the water-cooled condenser is provided with a heating water pump; and an input end of the power battery is provided with a battery water pump.

[0068] In a feasible embodiment, the compressor is provided with a bypass circuit, the input end and the output end of the bypass circuit are connected with the output end and the input end of the compressor respectively, and a bypass valve is arranged on the bypass circuit.

[0069] In a feasible embodiment, the b valve port of the eight-way water valve is further connected with the output end of the power battery.

[0070] The application discloses a new energy automobile indirect heat exchange heat management system based on an eight-way and five-way water valve, which comprises the following 12 operation methods.

[0071] (1) R290 heat pump system forced cooling:

[0072] a. Single occupant cabin refrigeration mode: refer to Figure 2 After the compressor is started, the low-temperature and low-pressure refrigerant vapor is sucked into the compressor and compressed into high-temperature and high-pressure refrigerant vapor, which is discharged to the water-cooled condenser to release heat and condense into normal-temperature and high-pressure liquid refrigerant. At the same time, the heat is transferred to the heat carrier, the temperature of the heat carrier is raised, and the heat carrier flows into the eight-way valve e port and flows out from the f port, and then enters the front end radiator to release heat to the atmosphere, and the temperature of the heat carrier is lowered and flows through the electric drive assembly to absorb part of the heat and then enters the five-way valve 4 port and flows out from the 1 port and then enters the heating water pump, and then enters the water-cooled condenser again, so as to circulate and transfer the heat of the refrigerant to the atmosphere. On the other hand, the normal-temperature and high-pressure liquid refrigerant described above enters the electronic expansion valve EXV through the liquid storage tank, is throttled and expanded into low-temperature and low-pressure gas-liquid two-phase refrigerant, then enters the plate evaporator Chiller to absorb the heat of the heat carrier and is gasified into low-temperature and low-pressure gaseous refrigerant, and then enters the compressor to be compressed into high-temperature and high-pressure gaseous refrigerant again, so as to circulate and extract the cooling capacity. The heat absorbed in the Chiller is lowered, and the heat carrier enters the eight-way valve from the g port and flows out from the h port, then enters the air conditioner cooler to absorb the heat in the occupant cabin air, and the temperature is raised, then flows into the five-way valve 2b port and flows out from the 3 port and enters the refrigeration water pump, and finally enters the Chiller again, so as to circulate and continuously take away the heat in the occupant cabin air to cool and lower the temperature.

[0073] b. Occupant cabin and battery mixed refrigeration mode: refer to Figure 3, after the compressor is started, the low-temperature and low-pressure refrigerant vapor is sucked into the compressor and compressed into high-temperature and high-pressure refrigerant vapor, which is discharged to the water-cooled condenser to release heat and condense into normal-temperature and high-pressure liquid refrigerant. At the same time, heat is transferred to the heat carrier, the temperature of the heat carrier rises, flows into the eight-way valve e port and flows out from the f port, then enters the front radiator to release heat to the atmosphere, and the temperature of the heat carrier drops after flowing through the electric drive assembly to absorb part of the heat and then enters the five-way valve 4 port and flows out from the 1 port, then enters the heating water pump, and then enters the water-cooled condenser again. This cycle repeatedly transfers the heat of the refrigerant to the atmosphere; on the other hand, the normal-temperature and high-pressure liquid refrigerant described above enters the electronic expansion valve EXV through the liquid storage tank, throttling and expanding into low-temperature and low-pressure gas-liquid two-phase refrigerant, then enters the Chiller to absorb the heat of the heat carrier and gasify into low-temperature and low-pressure gaseous refrigerant, then enters the compressor and is compressed again into high-temperature and high-pressure gaseous refrigerant. This cycle repeatedly extracts cold energy; the heat absorbed by the heat carrier in the Chiller drops in temperature and enters the eight-way valve through the g port and flows out from the h port, then divides into two paths, one of which enters the air conditioner cooler to absorb the heat in the passenger cabin air and rises in temperature, then flows into the five-way valve 2b port and flows out from the 3 port into the refrigeration water pump, and finally enters the Chiller again. This cycle repeatedly removes the heat in the passenger cabin air to cool it down; the other path enters the eight-way valve c port and flows out from the b port, flows into the battery water pump and flows into the power battery assembly to absorb heat and rise in temperature, then flows out from the five-way valve 2a port through the 3 port into the refrigeration water pump, and then enters the Chiller again. This cycle repeatedly removes the heat of the power battery to cool it down.

[0074] c. Forced cooling of the battery: refer to Figure 4, after the compressor is started, the low-temperature and low-pressure refrigerant vapor is sucked into the compressor and compressed into high-temperature and high-pressure refrigerant vapor, which is discharged to the water-cooled condenser to release heat and condense into normal-temperature and high-pressure liquid refrigerant. At the same time, the heat is transferred to the coolant, the temperature of the coolant rises, flows into the eight-way valve e port and flows out from the f port, then enters the front radiator to release heat to the atmosphere, the temperature of the coolant drops, flows through the electric drive assembly to absorb part of the heat, and then enters the five-way valve 4 port and flows out from the 1 port, then enters the heating water pump, and then enters the water-cooled condenser again. This cycle repeatedly transfers the heat of the refrigerant to the atmosphere; on the other hand, the normal-temperature and high-pressure liquid refrigerant described above enters the electronic expansion valve EXV through the liquid storage tank, throttling and expanding into low-temperature and low-pressure gas-liquid two-phase refrigerant, then enters the Chiller to absorb the heat of the coolant and gasify into low-temperature and low-pressure gaseous refrigerant, then enters the compressor and is compressed again into high-temperature and high-pressure gaseous refrigerant. This cycle repeatedly extracts cold energy; the coolant whose temperature drops after absorbing heat in the Chiller enters the eight-way valve through the g port and flows out from the h port, then enters the eight-way valve c port and flows out from the b port, flows into the power battery assembly through the battery water pump to absorb heat and then the temperature rises, then flows out from the 3 port to the 2a port of the five-way valve and enters the refrigeration water pump, and then enters the Chiller again. This cycle repeatedly removes the heat of the power battery to cool it down.

[0075] (2) R290 heat pump system forced heating:

[0076] a. Cabin heating and dehumidification: refer to Figure 5, the low-temperature and low-pressure refrigerant vapor is compressed by the compressor into high-temperature and high-pressure refrigerant vapor, which is discharged to the water-cooled condenser to release heat and condense into normal-temperature and high-pressure liquid refrigerant. At the same time, heat is transferred to the carrier coolant, the temperature of the carrier coolant rises, and then flows into the eight-way valve e port and flows out from the d port, and then enters the air conditioning heater core to release heat to the air in the passenger cabin. After the temperature of the carrier coolant drops, it flows into the water-cooled condenser again through the heating water pump, and the cycle is repeated to take heat and heat the air in the passenger cabin. On the other hand, the normal-temperature and high-pressure liquid refrigerant described above enters the electronic expansion valve EXV through the liquid storage tank, and is throttled and expanded into low-temperature and low-pressure gas-liquid two-phase refrigerant, and then enters the Chiller to absorb the heat of the carrier coolant and gasify into low-temperature and low-pressure gaseous refrigerant. Then it enters the compressor and is compressed again into high-temperature and high-pressure gaseous refrigerant, and the cycle is repeated to take cold energy. After the temperature of the carrier coolant that releases heat in the Chiller drops, it enters the eight-way valve g port and then divides into two paths. One path flows out from the h port of the eight-way valve, enters the air conditioning chiller, absorbs heat from the air in the passenger cabin, and then flows into the five-way valve 2b port and flows out from the 3 port to enter the refrigeration water pump, and finally enters the Chiller again. The cycle is repeated to continuously take away the heat and moisture in the air in the passenger cabin. The other path flows out from the f port of the eight-way valve, absorbs atmospheric heat through the front radiator, and then absorbs heat through the electric drive assembly, and then flows into the five-way valve 4 port and flows out from the 3 port to enter the refrigeration water pump, and then enters the Chiller again. The cycle is repeated to continuously transfer the heat of the atmosphere and the electric drive assembly to the passenger cabin through the heat pump.

[0077] b, passenger cabin heat pump heating: refer to Figure 6 , the low-temperature and low-pressure refrigerant vapor is compressed by the compressor into high-temperature and high-pressure refrigerant vapor, which is discharged to the water-cooled condenser to release heat and condense into normal-temperature and high-pressure liquid refrigerant. At the same time, heat is transferred to the carrier coolant, the temperature of the carrier coolant rises, and then flows into the eight-way valve e port and flows out from the d port, and then enters the air conditioning heater core to release heat to the air in the passenger cabin. After the temperature of the carrier coolant drops, it flows into the water-cooled condenser again through the heating water pump, and the cycle is repeated to take heat and heat the air in the passenger cabin. On the other hand, the normal-temperature and high-pressure liquid refrigerant described above enters the electronic expansion valve EXV through the liquid storage tank, and is throttled and expanded into low-temperature and low-pressure gas-liquid two-phase refrigerant, and then enters the Chiller to absorb the heat of the carrier coolant and gasify into low-temperature and low-pressure gaseous refrigerant. Then it enters the compressor and is compressed again into high-temperature and high-pressure gaseous refrigerant, and the cycle is repeated to take cold energy. After the temperature of the carrier coolant that releases heat in the Chiller drops, it enters the eight-way valve g port and then divides into two paths. One path flows out from the h port of the eight-way valve, enters the air conditioning chiller, absorbs heat from the air in the passenger cabin, and then flows into the five-way valve 2b port and flows out from the 3 port to enter the refrigeration water pump, and finally enters the Chiller again. The cycle is repeated to continuously take away the heat and moisture in the air in the passenger cabin. The other path flows out from the f port of the eight-way valve, absorbs atmospheric heat through the front radiator, and then absorbs heat through the electric drive assembly, and then flows into the five-way valve 4 port and flows out from the 3 port to enter the refrigeration water pump, and then enters the Chiller again. The cycle is repeated to continuously transfer the heat of the atmosphere and the electric drive assembly to the passenger cabin through the heat pump.

[0078] c. Hot gas bypass heating: refer to Figure 7 After the compressor starts, the low-temperature and low-pressure two-phase refrigerant mixes with the high-temperature and low-pressure gaseous refrigerant, is sucked into the compressor, and is compressed into high-temperature and high-pressure refrigerant vapor, which is divided into two paths. One path is discharged to the water-cooled condenser to release heat and condense into normal-temperature and high-pressure liquid refrigerant. The other path is directly bypassed and depressurized back to the suction port of the compressor. At the same time, heat is transferred to the PCM, and the temperature of the PCM rises. The PCM flows into the e port of the eight-way valve from the d port, and then enters the air conditioning heater core to release heat to the air in the passenger compartment. The temperature of the PCM drops, and the PCM flows into the water-cooled condenser again through the heating water pump, and the cycle continues to take heat and heat the air in the passenger compartment. On the other hand, the normal-temperature and high-pressure liquid refrigerant described above enters the electronic expansion valve EXV through the liquid accumulator, throttling and expanding into low-temperature and low-pressure gaseous-liquid two-phase refrigerant. Then it passes through the Chiller to absorb a little heat and vaporize into low-temperature and low-pressure gaseous-liquid two-phase refrigerant with higher dryness. Then it enters the compressor and mixes with the low-pressure and high-temperature gaseous refrigerant, becoming superheated vapor, which is compressed again into high-temperature and high-pressure gaseous refrigerant. The cycle continues to take heat. The PCM, whose temperature drops after releasing heat in the Chiller, enters the f port of the eight-way valve from the g port, flows out of the f port, absorbs atmospheric heat through the front end radiator, and then absorbs heat through the electric drive assembly. The temperature rises, and then the PCM flows into the heating water pump from the 3 port and out of the 4 port. The PCM enters the Chiller again, and the cycle continues to take heat from the atmosphere and the electric drive assembly and transfer the heat to the passenger compartment through the high-grade electric energy input into the heat pump.

[0079] It should be noted that when the ambient temperature is low, the evaporating pressure of the heat pump system decreases, and the evaporating temperature decreases. At this time, the specific volume of the refrigerant increases, the mass of the refrigerant compressed by the compressor per unit time decreases rapidly, i.e., the mass flow rate decreases rapidly, the enthalpy of the refrigerant per unit mass increases, and the compressor discharge temperature soars. However, the heating capacity decreases because the heating capacity is the product of the mass flow rate and the enthalpy of the refrigerant, and one of the multipliers decreases while the other slightly increases, resulting in a decrease in the product, i.e., the heating capacity. The low-pressure and high-temperature refrigerant that bypasses the suction port through the bypass valve mixes with the low-temperature and low-pressure refrigerant that returns through the electronic expansion valve, reducing the specific volume of the refrigerant and increasing the mass flow rate of the refrigerant through the compressor, thereby increasing the compressor compression power and improving the heating capacity.

[0080] d. Battery heating mode: refer to Figure 8, after the compressor is started, the low-temperature and low-pressure refrigerant vapor is sucked into the compressor and compressed into high-temperature and high-pressure refrigerant vapor, which is discharged to the water-cooled condenser to release heat and condense into normal-temperature and high-pressure liquid refrigerant, at the same time, the heat is transferred to the heat carrier, the temperature of the heat carrier is raised, and then flows out from the b port of the eight-way valve e, and then enters the power battery assembly through the battery water pump to release heat to the power battery, and the temperature of the heat carrier is lowered and flows into the water-cooled condenser again through the heating water pump, so as to circulate and take heat to heat the power battery; on the other hand, the normal-temperature and high-pressure liquid refrigerant described above enters the electronic expansion valve EXV through the liquid storage tank, and is throttled and expanded into low-temperature and low-pressure gas-liquid two-phase refrigerant, then enters the Chiller to absorb the heat of the heat carrier and gasify into low-temperature and low-pressure gaseous refrigerant, and then enters the compressor to be compressed again into high-temperature and high-pressure gaseous refrigerant, so as to circulate and take cold; after the heat of the heat carrier is absorbed in the Chiller, the temperature of the heat carrier is lowered and enters the eight-way valve f port from the g port, and then flows out from the f port, and then absorbs the heat of the atmosphere after passing through the front-end radiator, and then absorbs the heat of the electric drive assembly again, and then flows into the refrigeration water pump from the 3 port and flows out from the 4 port, and then enters the Chiller again, so as to circulate and continuously transfer the heat of the atmosphere and the electric drive assembly to the power battery through the heat pump to increase the temperature of the power battery.

[0081] (3) Natural cooling:

[0082] a. Electric drive electric control heat dissipation: refer to Figure 9 After the vehicle is started, the heat carrier enters the electric drive assembly to absorb heat and the temperature is raised, then enters the five-way valve from the 4 port and flows out from the 3 port to enter the refrigeration water pump, passes through the Chiller, and then flows into the f port from the g port of the eight-way valve and flows out, then enters the front-end heat exchanger to release heat to the atmosphere, and finally enters the electric drive assembly again to absorb heat, so as to circulate and continuously cool the electric drive assembly. In this mode, the heat carrier does not exchange heat when flowing through the Chiller and the water-cooled condenser.

[0083] b. Battery module temperature equalization self-circulation: refer to Figure 10 After the vehicle is started, the heat carrier enters the electric drive assembly to absorb heat and the temperature is raised, then enters the five-way valve from the 4 port and flows out from the 3 port to enter the refrigeration water pump, passes through the Chiller, and then flows into the a port from the g port of the eight-way valve and flows out, then enters the electric drive assembly to absorb heat again, so as to circulate and continuously increase the temperature of the electric drive assembly. In this mode, the heat carrier does not exchange heat when flowing through the Chiller and the water-cooled condenser.

[0084] c. Battery low-temperature heat dissipation: refer to Figure 11, the vehicle starts, the cold carrier enters the power battery assembly to absorb heat, and the temperature rises, and then enters the five-way valve through 2a, flows out through 3, enters the refrigerated water pump, passes through the Chiller, and then flows into f from g, and then flows out, and then enters the front-end evaporator to release heat and reduce the temperature, and then enters the electric drive assembly to absorb part of the heat, and then enters the five-way valve 4, and then flows out from 1 into the heating water pump, and then enters the water-cooled condenser, and then enters the eight-way valve e again and flows out from b, and then enters the battery water pump, and finally returns to the power battery assembly, so as to continuously reduce the temperature of the power battery. The cold carrier flowing through the Chiller and the water-cooled condenser does not exchange heat.

[0085] (4) Waste heat recovery:

[0086] a, waste heat recovery: refer to Figure 12 After the compressor starts, the low-temperature and low-pressure refrigerant vapor is sucked into the compressor and compressed into high-temperature and high-pressure refrigerant vapor, which is discharged to the water-cooled condenser to release heat and condense into normal-temperature and high-pressure liquid refrigerant. At the same time, heat is transferred to the cold carrier, and the temperature of the cold carrier rises, flows into the eight-way valve e, and is divided into two paths, one of which flows out from d, and then enters the air conditioning heater core to release heat to the cabin air, and the temperature of the cold carrier decreases and flows into the water-cooled condenser again through the heating water pump. This cycle repeatedly takes heat to heat the cabin air; the other path flows out from b, passes through the battery water pump into the power battery assembly, and the temperature of the cold carrier decreases and then flows into the water-cooled condenser again through the heating water pump. This cycle repeatedly takes heat to heat the power battery; on the other hand, the normal-temperature and high-pressure liquid refrigerant described above enters the electronic expansion valve EXV through the liquid tank, throttling and expanding into low-temperature and low-pressure gas-liquid two-phase refrigerant, and then enters the Chiller to absorb the heat of the cold carrier and gasify into low-temperature and low-pressure gaseous refrigerant. Then it enters the compressor and is compressed again into high-temperature and high-pressure gaseous refrigerant. This cycle repeatedly takes cold. The temperature of the cold carrier that absorbs heat in the Chiller decreases and flows out through g into the eight-way valve a, and then flows out through the electric drive assembly to absorb heat, and then flows into the five-way valve 4 from 3, and then flows out from 3 into the refrigerated water pump, and then enters the Chiller again. This cycle repeatedly increases the quality of the heat of the atmosphere and the electric drive assembly and transfers it to the cabin and the power battery to take heat.

[0087] b, electric drive electric control waste heat recovery: refer to Figure 13, after the compressor is started, the low-temperature and low-pressure refrigerant vapor is sucked into the compressor and compressed into high-temperature and high-pressure refrigerant vapor, and then discharged to the water-cooled condenser to release heat and condensed into high-pressure liquid refrigerant at room temperature, at the same time, heat is transferred to the heat carrier, the temperature of the heat carrier is raised, and then flows into the eight-way valve e port and flows out from the b port, enters the battery water pump, and then enters the power battery assembly, and the temperature of the heat carrier is lowered, and then heated by the heating water pump and flows into the water-cooled condenser again, so as to circulate repeatedly to take heat to heat the power battery; on the other hand, the high-pressure liquid refrigerant at room temperature described above enters the electronic expansion valve EXV throttling expansion valve to become low-temperature and low-pressure gas-liquid two-phase refrigerant, then enters the Chiller to absorb the heat of the heat carrier, and is gasified into low-temperature and low-pressure gaseous refrigerant, and then enters the compressor to be compressed again into high-temperature and high-pressure gaseous refrigerant, so as to circulate repeatedly to take cold; after the heat carrier in the Chiller absorbs heat, the temperature of the heat carrier is lowered, and then enters the eight-way valve a port and flows out, and then enters the electric drive assembly to absorb heat, and then flows into the five-way valve 4 port from the 3 port and flows out to enter the refrigeration water pump, and then enters the Chiller again, so as to circulate repeatedly to transfer the heat of the electric drive assembly to the power battery through the heat pump to take heat.

[0088] c, electric drive heating battery: refer to Figure 14 After the vehicle is started, the heat carrier enters the electric drive assembly to absorb heat, and then enters the five-way valve from the 4 port and flows out from the 1 port to enter the heating water pump, passes through the water-cooled condenser, and then flows into the eight-way valve e port from the a port and flows out, and then enters the battery water pump to raise the pressure head, and then enters the power battery assembly to heat the power battery, and then the heat carrier with lowered temperature flows into the five-way valve from the 2a port and flows out from the 3 port to enter the refrigeration water pump, and then passes through the Chiller to enter the eight-way valve g port and flow out from the a port to enter the electric drive assembly to absorb heat again, so as to circulate repeatedly to heat the power battery until the temperature is raised to the target temperature. In this mode, the heat carrier flowing through the Chiller and the water-cooled condenser does not exchange heat.

[0089] The application discloses a R290 indirect heat exchange thermal management system for a new energy vehicle.

[0090] The R290 refrigerant can be isolated outside the passenger cabin, the R290 heat pump and the valve island can be integrated together to minimize the refrigerant charge and reduce the risk of flammability and explosiveness; the indoor refrigerator and the front evaporation heat exchanger pipe are both low-pressure heat carriers, which can reduce the cost of parts; compared with a traditional heat pump waste heat recovery, the safety factor and COP are improved, and the system is more environmentally friendly and energy-saving;

[0091] The proposed indirect heat exchange heat management system has a hot gas bypass circuit in addition to the existing indirect heat exchange heat management system when operating in the heat pump heating mode, which can improve the heating capacity of the system at low ambient temperature. The specific principle is that when the environment temperature is low, the evaporating pressure of the heat pump system decreases, and the corresponding evaporating temperature decreases. At this time, the specific volume of the refrigerant increases, the mass of the refrigerant compressed by the compressor per unit time decreases rapidly, that is, the mass flow rate decreases rapidly, the enthalpy of the unit mass of the refrigerant increases, and the exhaust temperature of the compressor rises rapidly. However, the heating capacity decreases because the heating capacity is the product of the mass flow rate and the enthalpy of the refrigerant, and one of the multipliers decreases rapidly and the other increases slightly, resulting in a decrease in the product of the two, that is, the heating capacity. The low-pressure high-temperature refrigerant bypassing the suction port of the bypass valve and the low-temperature low-pressure refrigerant returning through the electronic expansion valve are mixed to reduce the specific volume of the refrigerant and improve the mass flow rate of the refrigerant passing through the compressor, thereby improving the compressor compression power and thus improving the heating capacity.

[0092] The water loop only uses 2 main water pumps and 1 battery loop compensation water pump to realize normal operation of the modes of single-occupant cabin refrigeration, occupant cabin and battery hybrid refrigeration, occupant cabin heating and dehumidification, occupant cabin heat pump heating, battery forced cooling, battery low-temperature heat dissipation, battery heating, battery module temperature equalization self-circulation, waste heat recovery, electric drive and electric control heat dissipation, electric drive and electric control waste heat recovery, and electric drive heating battery, compared with other indirect heat exchange systems, the power is small and the cost is low.

[0093] The present application is designed for R290 system and also considers compatibility with R134a and R1234yf. The above three refrigerants can be used normally in the present application, and only the corresponding lubricating oil needs to be added in advance according to the charged refrigerant, and no modification is needed for the parts.

[0094] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An indirect heat exchange thermal management system based on eight-way and five-way water valves, comprising a refrigerant circuit, characterized in that: The eight-way water valve and the five-way water valve are included. The refrigerant circuit is composed of a compressor, a water-cooled condenser, a liquid storage tank, a throttling expansion valve and a plate evaporator, an output end of the compressor is connected to a refrigerant input end of the water-cooled condenser, a refrigerant output end of the water-cooled condenser is connected to a refrigerant input end of the plate evaporator through the liquid storage tank and the throttling expansion valve, and a refrigerant output end of the plate evaporator is connected to an input end of the compressor. The eight-way water valve includes eight valve ports a-h, the a valve port of the eight-way water valve is connected to an input end of the electric drive assembly, the b valve port is connected to an input end of the power battery, the c valve port is connected to the h valve port, the d valve port is connected to an input end of the air conditioning heater core, the e valve port is connected to a coolant output end of the water-cooled condenser, the f valve port is connected to an input end of the front-end radiator, the g valve port is connected to a coolant output end of the plate evaporator, and the h valve port is connected to the c valve port and an input end of the air conditioning refrigerator. The five-way water valve includes five valve ports 1, 2a, 2b, 3 and 4, the 1 valve port of the five-way water valve is connected to a coolant input end of the water-cooled condenser, the 2a valve port is connected to an output end of the power battery, the 2b valve port is connected to an output end of the air conditioning refrigerator, the 3 valve port is connected to a coolant input end of the plate evaporator, and the 4 valve port is connected to an output end of the electric drive assembly. An output end of the front-end radiator is connected to an input end of the electric drive assembly, and an output end of the air conditioning heater core is connected to a coolant input end of the water-cooled condenser. The a valve port of the eight-way water valve is connected to the b, c, d, e, g and h valve ports, the f valve port is connected to the g, h, b, c, d and e valve ports, the b valve port is connected to the a, c, d, e and f valve ports, the c valve port is connected to the a, b, d, e and f valve ports, the d valve port is connected to the a, b, c, e and f valve ports, the e valve port is connected to the a, b, c, d and f valve ports, the g valve port is connected to the h, a and f valve ports, and the h valve port is connected to the a, f and g valve ports. The 1 valve port of the five-way water valve is connected to the 2a, 2b and 4 valve ports, the 2a valve port is connected to the 1 and 3 valve ports, the 2b valve port is connected to the 1 and 3 valve ports, and the 3 valve port is connected to the 2a, 2b and 4 valve ports. A coolant input end of the plate evaporator is provided with a refrigeration water pump, a coolant input end of the water-cooled condenser is provided with a heating water pump, and an input end of the power battery is provided with a battery water pump.

2. A natural cooling method of an indirect heat exchange thermal management system based on eight-way and five-way water valves according to claim 1, characterized in that, A bypass circuit is arranged at the compressor, an input end of the bypass circuit is connected to an output end of the compressor, and an output end of the bypass circuit is connected to an input end of the compressor. The method includes an electric drive electric control heat dissipation method, a battery module temperature equalization self-circulation method and a battery low-temperature heat dissipation method. The electric drive electric control heat dissipation method specifically includes the following steps. A1, open the passage between the 4 valve port and the 3 valve port of the five-way water valve, and open the passage between the g valve port and the f valve port of the eight-way water valve. A2, after the vehicle starts, the temperature of the coolant rises after absorbing heat in the electric drive assembly, then enters the five-way water valve through the 4th valve port, flows out through the 3rd valve port, enters the refrigeration water pump, passes through the plate evaporator, and then flows into the fth valve port from the gth valve port of the eight-way water valve, then enters the front end heat exchanger to release heat to the atmosphere, and then returns to the electric drive assembly; The battery module temperature equalization self-circulation method specifically comprises the following steps: B1, open the passage between the 4th valve port and the 3rd valve port of the five-way water valve, and open the passage between the gth valve port and the ath valve port of the eight-way water valve; B2, after the vehicle starts, the temperature of the coolant rises after absorbing heat in the electric drive assembly, then enters the five-way water valve through the 4th valve port, flows out through the 3rd valve port, enters the refrigeration water pump, passes through the plate evaporator, and then flows into the ath valve port from the gth valve port of the eight-way water valve, then returns to the electric drive assembly; B3, self-circulation between the power battery and the battery water pump; The battery low-temperature heat dissipation method specifically comprises the following steps: C1, open the passage between the 2a valve port and the 3rd valve port of the five-way water valve, and open the passage between the 4th valve port and the 1st valve port; open the passage between the gth valve port and the fth valve port of the eight-way water valve, and open the passage between the e valve port and the b valve port; C2, after the vehicle starts, the temperature of the coolant rises after absorbing heat in the power battery assembly, then enters the five-way water valve through the 2a valve port, flows out through the 3rd valve port, enters the refrigeration water pump, passes through the plate evaporator, and then flows into the fth valve port from the gth valve port of the eight-way water valve, then enters the front end evaporator to release heat and reduce temperature; C3, after absorbing heat in the electric drive assembly, it enters the 4th valve port of the five-way water valve again, flows out from the 1st valve port into the heating water pump, passes through the water-cooled condenser again, and then enters the e valve port of the eight-way water valve, flows out from the b valve port into the battery water pump, and returns to the power battery.

3. A method of waste heat recovery for an indirect heat exchange thermal management system based on eight-way and five-way water valves as claimed in claim 1, wherein, The waste heat recovery method, the electric drive electric control waste heat recovery method and the electric drive heating battery method are included; the waste heat recovery method comprises the following steps: D1, after the compressor starts, the low-temperature and low-pressure refrigerant vapor is sucked into the compressor and compressed into high-temperature and high-pressure refrigerant vapor, which is discharged to the water-cooled condenser to release heat and condensed into constant-temperature and high-pressure liquid refrigerant, and the heat is transferred to the coolant of the water-cooled condenser; D2, open the passage between the e valve port and the d valve port of the eight-way water valve, and open the passage between the e valve port and the b valve port; The coolant of the water-cooled condenser flows into the e valve port of the eight-way water valve and is divided into two paths, one of which flows out from the d valve port, then enters the air conditioning heating core to release heat to the air in the passenger compartment, and then flows into the water-cooled condenser again through the heating water pump; the other flows out from the b valve port, enters the power battery through the battery water pump, and then flows into the water-cooled condenser again through the heating water pump; D3, the constant-temperature and high-pressure liquid refrigerant in step D1 enters the throttling expansion valve through the liquid storage tank to become low-temperature and low-pressure gas-liquid two-phase refrigerant, then enters the plate evaporator to absorb the heat of the coolant of the plate evaporator, and gasifies into low-temperature and low-pressure gaseous refrigerant, and returns to the compressor. D4, open the passage between the g valve port and the a valve port of the eight-way water valve, open the passage between the 4 valve port and the 3 valve port of the five-way water valve, the refrigerant of the plate evaporator enters the a valve port of the eight-way water valve through the g valve port, flows out, is heated by the electric drive assembly, flows into the 4 valve port of the five-way water valve, flows out from the 3 valve port, enters the refrigeration water pump, and returns to the plate evaporator; The electric drive electric control waste heat recovery method comprises the following steps: E1, after the compressor is started, the low-temperature and low-pressure refrigerant vapor is sucked into the compressor and compressed into high-temperature and high-pressure refrigerant vapor, which is discharged to the water-cooled condenser to release heat and condense into constant-temperature and high-pressure liquid refrigerant, and the heat is transferred to the refrigerant of the water-cooled condenser; E2, open the passage between the e valve port and the b valve port of the eight-way water valve; the refrigerant of the water-cooled condenser enters the power battery through the battery water pump and returns to the water-cooled condenser through the heating water pump; E3, the constant-temperature and high-pressure liquid refrigerant in step E1 enters the throttling expansion valve through the liquid storage tank to become low-temperature and low-pressure gas-liquid two-phase refrigerant, then enters the plate evaporator to absorb the heat of the refrigerant of the plate evaporator, and gasifies into low-temperature and low-pressure gaseous refrigerant, and returns to the compressor; E4, open the passage between the g valve port and the a valve port of the eight-way water valve, and open the passage between the 4 valve port and the 3 valve port of the five-way water valve; the refrigerant of the plate evaporator enters the a valve port of the eight-way water valve through the g valve port, flows out, is heated by the electric drive assembly, flows into the 4 valve port of the five-way water valve, flows out from the 3 valve port, enters the refrigeration water pump, and returns to the plate evaporator; The electric drive heating battery method comprises the following steps: F1, open the passage between the 2a valve port and the 3 valve port of the five-way water valve and the passage between the 4 valve port and the 1 valve port; open the passage between the g valve port and the f valve port of the eight-way water valve and the passage between the e valve port and the b valve port; F2, after the vehicle is started, the refrigerant enters the electric drive assembly, absorbs heat, and then enters the five-way water valve through the 4 valve port, flows out from the 1 valve port, enters the heating water pump, passes through the water-cooled condenser, and then flows into the a valve port of the eight-way water valve from the e valve port, flows out, and then enters the power battery after the pressure head is raised by the battery water pump; F3, the refrigerant with reduced temperature flows into the 3 valve port from the 2a valve port of the five-way water valve, flows out, enters the refrigeration water pump, then enters the eight-way water valve through the plate evaporator, and flows out from the a valve port to return to the electric drive assembly.

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