A heat pump system for efficient waste heat utilization and control method thereof

Abstract

The present invention provides a heat pump system for efficient waste heat utilization and a control method thereof, comprising an electric compressor, a water-cooled condenser, an outdoor heat exchanger, a check valve, a battery cooling plate heat exchanger and a gas-liquid separator which are sequentially connected through a pipeline circulation, the pipeline between the outdoor heat exchanger and the water-cooled condenser is connected to the pipeline between the check valve and the battery cooling plate heat exchanger through a parallel pipeline, the pipeline between the outdoor heat exchanger and the check valve is connected to the gas-liquid separator through a pipeline; the present invention has the following beneficial effects: the present invention solves the shortcomings of the current heat pump air-conditioning system, which has a narrow operating boundary and a low low-temperature energy efficiency ratio; the present invention also solves the problem that the current waste heat utilization method can only use low-efficiency heat exchange through temperature difference, the operating conditions are limited and the use scenario of the battery can only be heated by motor heat; the present invention also solves the system design redundancy problem of the current waste heat recovery heat pump, and the number of system components is reduced overall, resulting in a reduction in weight and cost.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump systems, and in particular to a heat pump system for efficient waste heat utilization and a control method thereof. Background Art

[0002] The range is a major pain point in the new energy vehicle industry at this stage, especially in the low temperatures in winter. On the one hand, the battery activity decreases, resulting in reduced range. On the other hand, heating and air conditioning in winter consume a lot of electricity. The current mainstream practice in the thermal management industry is to use a relatively efficient heat pump air-conditioning system to heat and insulate the battery and heat the passenger compartment.

[0003] The disadvantages of existing heat pump air-conditioning systems are as follows: 1. Current heat pump air-conditioning systems have the disadvantages of narrow operating boundaries and low low-temperature energy efficiency ratio (when the low temperature drops to about -10°C, the stable operating COP is only about 1.4). The main reasons are: the evaporation pressure of phase change refrigerant is generally controlled at about 1-2 bar, and the evaporation pressure of refrigerant at -10°C is close to 1 bar, and the system circulation flow is low, resulting in the heat absorption efficiency of a single heating cycle at a lower temperature being lower than that of a single cooling cycle; 2. The utilization efficiency of motor heat is low, and the environmental conditions of utilization are harsh. It can only be kept warm through temperature difference, and heat cannot be transferred to the passenger compartment for utilization through a heat pump; 3. Some systems that use waste heat recovery heat pumps increase the number of core components, which increases cost and weight, reduces the overall reliability of the system, and increases the development workload of design verification. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a heat pump system with efficient waste heat utilization and a control method thereof, so as to solve the problems of narrow operating boundary and low low-temperature energy efficiency ratio in the prior art.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a heat pump system for efficient waste heat utilization, comprising an electric compressor, a water-cooled condenser, an outdoor heat exchanger, a check valve, a battery cooling plate heat exchanger and a gas-liquid separator which are sequentially connected through a pipeline cycle, wherein the pipeline between the outdoor heat exchanger and the water-cooled condenser and the pipeline between the check valve and the battery cooling plate heat exchanger are connected through parallel pipelines, the pipeline between the outdoor heat exchanger and the check valve and the gas-liquid separator are connected through pipelines, the pipeline between the check valve and the battery cooling plate heat exchanger and the gas-liquid separator are connected through pipelines, and the pipeline between the check valve and the battery cooling plate heat exchanger and the gas-liquid separator are connected through pipelines, and an evaporator is provided on the pipeline;

[0006] It also includes a heating water pump, a water-cooled condenser, a water-heating heater, a heater core, a three-way proportional valve and a battery heating plate heat exchanger which are sequentially connected through a pipeline circulation, and a circulation branch is provided between the third port of the three-way proportional valve and the heating water pump;

[0007] It also includes a first four-way reversing valve, a second four-way reversing valve, a battery water pump, a battery, a motor water pump, an electric drive device and a low-temperature radiator. The first port of the first four-way reversing valve is connected to the battery heating plate heat exchanger, the battery cooling plate heat exchanger and the first port of the second four-way reversing valve through pipelines in sequence. The second port of the second four-way reversing valve is connected to the battery water pump, the battery and the second port of the first four-way reversing valve through pipelines in sequence. The third port of the second four-way reversing valve is connected to the motor water pump, the electric drive device, the three-way reversing valve, the low-temperature radiator and the third port of the first four-way reversing valve through pipelines in sequence. The fourth port of the first four-way reversing valve is connected to the fourth port of the second four-way reversing valve through a pipeline. The pipeline between the low-temperature radiator and the first four-way reversing valve is connected to the third port of the three-way reversing valve through a pipeline.

[0008] In one embodiment of the present invention, it also includes a kettle, a fan for allowing air to flow through a low-temperature radiator and an outdoor heat exchanger for heat exchange, and a blower and a kettle for allowing air to flow through an evaporator and a warm air core. The first port of the kettle is connected to a port of the battery heating plate heat exchanger through a pipeline, the second port of the kettle is respectively connected to a port of the low-temperature radiator and a port of the water heater through pipelines, the third port of the kettle is connected to a port of the battery water pump through a pipeline, the fourth port of the kettle is connected to the pipeline between the battery and the battery water pump, and the pipeline between the first four-way reversing valve and the second four-way reversing valve, and the fourth port of the kettle is also connected to a port of the heating water pump through a pipeline.

[0009] In one embodiment of the present invention, a pressure temperature sensor and a heat pump electronic expansion valve are provided in sequence on the pipeline between the water-cooled condenser and the outdoor heat exchanger, a parallel stop valve is provided on the parallel pipeline, and an external heat exchanger outlet pressure temperature sensor is provided on the pipeline between the outdoor heat exchanger and the check valve.

[0010] In one embodiment of the present invention, a heat pump stop valve is provided on the pipeline between the external exchange outlet pressure temperature sensor and the gas-liquid separator, a battery electronic expansion valve is provided on the pipeline between the check valve and the battery cooling plate heat exchanger, a low-pressure pressure sensor is provided on the pipeline between the gas-liquid separator and the electric compressor, and a heater core water outlet temperature sensor is provided on the pipeline between the heater core and the three-way proportional valve.

[0011] The present invention provides a control method for a heat pump system with efficient waste heat utilization, the system is used in a dual-heat source heat pump heating working mode, the dual-heat source heat pump heating working mode includes a first refrigerant circuit, a first heating circuit, a first battery circuit and a first motor circuit.

[0012] In one embodiment of the present invention, the system is also used in a motor waste heat heat pump operating mode, and the motor waste heat heat pump operating mode includes a second refrigerant circuit, a second heating circuit, a second battery circuit and a second motor circuit.

[0013] In one embodiment of the present invention, the system is also used for an air source heat pump heating operating mode, and the air source heat pump heating operating mode includes a third refrigerant circuit, a third heating circuit and a first heating circuit branch.

[0014] In one embodiment of the present invention, the system is also used for a heat pump parallel dehumidification working mode, and the heat pump parallel dehumidification working mode includes a fourth refrigerant circuit, a first refrigerant circuit branch, a fourth heating circuit and a second heating circuit branch.

[0015] In one embodiment of the present invention, the system is also used for a heat pump series dehumidification working mode, and the heat pump series dehumidification working mode includes a fifth refrigerant circuit, a fifth heating circuit and a third heating circuit branch.

[0016] In one embodiment of the present invention, the system is also used for a heat pump waste heat recovery working mode, and the heat pump waste heat recovery working mode includes a sixth refrigerant circuit, a sixth heating circuit, and a battery and electric drive series circuit.

[0017] As described above, a heat pump system for efficient waste heat utilization and a control method thereof of the present invention have the following beneficial effects:

[0018] The present invention solves the shortcomings of the current heat pump air conditioning system, such as narrow operating boundary and low low-temperature energy efficiency ratio. At relatively low temperatures, such as -20°C, the heat pump not only absorbs heat from the ambient air through the outdoor heat exchanger, but also recovers heat from the motor and battery circuits. The operating boundary drops from -10°C to -20°C or even lower, and the energy efficiency ratio at -10°C is increased from 1.5 to about 2.0. The present invention also solves the problem that the current waste heat utilization method can only exchange heat inefficiently through temperature difference, the operating conditions are limited, and the use scenario of battery heating can only be limited by motor heat. The heat pump can recover the heat of the motor, and the recovered heat can be used for both passenger cabin heating and battery heating. The present invention also solves the system design redundancy problem of the current waste heat recovery heat pump, realizes the switching and heat utilization of the battery motor circuit through the integrated water circuit design, and realizes the heat absorption of the air heat source and the waste hot water heat source heat pump at relatively low temperatures. The dedicated heat recovery plate exchange of the refrigerant circuit is reduced, the four-way reversing and the corresponding valve group are reduced, and the number of system components is reduced overall, so that the weight and cost are reduced, and the reliability is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Shown is a schematic diagram of the overall structure of a heat pump system for efficient waste heat utilization disclosed in an embodiment of the present invention.

[0020] Component number description

[0021] 1. Low-temperature radiator; 2. Outdoor heat exchanger; 3. Fan; 4. Heat pump electronic expansion valve; 5. Pressure and temperature sensor; 6. Water-cooled condenser; 7. Heating water pump; 8. Water heating heater; 9. Battery heating plate heat exchanger; 10. First four-way reversing valve; 11. Battery; 12. Kettle; 13. Battery water pump; 14. Second four-way reversing valve; 15. Motor water pump; 16. Three-way proportional valve; 17. Battery electronic expansion valve; 18. Battery cooling plate heat exchanger; 19. Warm core water outlet temperature sensor; 20. Warm air core; 21. Evaporator; 22. Refrigeration electronic expansion valve; 23. Blower; 24. Electric compressor; 25. Low-pressure pressure sensor; 26. Gas-liquid separator; 27. Parallel stop valve; 28. Heat pump stop valve; 29. ​​Check valve; 30. Electric drive device; 31. External exchange outlet pressure and temperature sensor; 32. Three-way reversing valve. DETAILED DESCRIPTION

[0022] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0023] See also Figure 1 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0024] The present invention relates to a heat pump system for efficient waste heat utilization. Figure 1, including an electric compressor 24, a water-cooled condenser 6, an outdoor heat exchanger 2, a check valve 29, a battery cooling plate heat exchanger 18 and a gas-liquid separator 26 which are sequentially connected through a pipeline cycle, the pipeline between the outdoor heat exchanger 2 and the water-cooled condenser 6 and the pipeline between the check valve 29 and the battery cooling plate heat exchanger 18 are connected through parallel pipelines, the pipeline between the outdoor heat exchanger 2 and the check valve 29 and the gas-liquid separator 26 are connected through a pipeline, the pipeline between the check valve 29 and the battery cooling plate heat exchanger 18 and the gas-liquid separator 26 are connected through a pipeline, and an evaporator 21 is provided on the pipeline, A pressure temperature sensor 5 and a heat pump electronic expansion valve 4 are provided in sequence on the pipeline between the water-cooled condenser 6 and the outdoor heat exchanger 2, a parallel stop valve 27 is provided on the parallel pipeline, an external heat exchange outlet pressure temperature sensor 31 is provided on the pipeline between the outdoor heat exchanger 2 and the check valve 29, a heat pump stop valve 28 is provided on the pipeline between the external heat exchange outlet pressure temperature sensor 31 and the gas-liquid separator 26, a battery electronic expansion valve 17 is provided on the pipeline between the check valve 29 and the battery cooling plate heat exchanger 18, and a low-pressure pressure sensor 25 is provided on the pipeline between the gas-liquid separator 26 and the electric compressor 24;

[0025] It also includes a heating water pump 7, a water-cooled condenser 6, a water-heating heater 8, a heater core 20, a three-way proportional valve 16 and a battery heating plate heat exchanger 9 which are sequentially connected through a pipeline circulation, a circulation branch is provided between the third port of the three-way proportional valve 16 and the heating water pump 7, and a heater core water outlet temperature sensor 19 is provided on the pipeline between the heater core 20 and the three-way proportional valve 16;

[0026] It also includes a first four-way reversing valve 10, a second four-way reversing valve 14, a battery water pump 13, a battery 11, a motor water pump 15, an electric drive device 30 and a low-temperature radiator 1, wherein the first port of the first four-way reversing valve 10 is connected to the battery heating plate heat exchanger 9, the battery cooling plate heat exchanger 18 and the first port of the second four-way reversing valve 14 through pipelines in sequence, the second port of the second four-way reversing valve 14 is connected to the battery water pump 13, the battery 11 and the second port of the first four-way reversing valve 10 through pipelines in sequence, the third port of the second four-way reversing valve 14 is connected to the motor water pump 15, the electric drive device 30, the three-way reversing valve 32, the low-temperature radiator 1 and the third port of the first four-way reversing valve 10 through pipelines in sequence, the fourth port of the first four-way reversing valve 10 is connected to the fourth port of the second four-way reversing valve 14 through pipelines, and the pipeline between the low-temperature radiator 1 and the first four-way reversing valve 10 is connected to the third port of the three-way reversing valve 32 through pipelines;

[0027] It also includes a kettle 12, a fan 3 for making an airflow flow through the low-temperature radiator 1 and the outdoor heat exchanger 2 for heat exchange, and a blower 23 for making an airflow flow through the evaporator 21 and the warm air core 20. The first port of the kettle 12 is connected to a port of the battery heating plate heat exchanger 9 through a pipeline, the second port of the kettle 12 is respectively connected to a port of the low-temperature radiator 1 and a port of the water heater 8 through a pipeline, the third port of the kettle 12 is connected to a port of the battery water pump 13 through a pipeline, the fourth port of the kettle 12 is connected to the pipeline between the battery 11 and the battery water pump 13, and the pipeline between the first four-way reversing valve 10 and the second four-way reversing valve 14, and the fourth port of the kettle 12 is also connected to a port of the heating water pump 7 through a pipeline;

[0028] Specifically, the low-temperature radiator 1 can perform air cooling on the hot water flowing into the low-temperature radiator 1, wherein the hot water can come from the electric drive device 30 and each battery circuit; the outdoor heat exchanger 2 can cool the high-temperature refrigerant to release heat during condensation, and evaporate the low-pressure low-temperature refrigerant to absorb heat during evaporation; the fan 3 can rotate the fan blades to make the air flow through the low-temperature radiator 1 and the outdoor heat exchanger 2 for heat exchange; the heat pump electronic expansion valve 4 can control different flow rates and low pressures by controlling the valve core opening, thereby achieving a throttling effect; the pressure and temperature sensor 5 can collect the current pressure and temperature of the refrigerant for system control; the water-cooled condenser 6 is a plate heat exchanger for heat exchange between high-temperature refrigerant and antifreeze; the heating water pump 7 is a power device that drives the heating circuit to flow and exchange heat; the water heating heater 8 is a heat exchanger for the antifreeze flowing through the a device for heating; the battery heating plate heat exchanger 9 is a plate heat exchanger for heat exchange between high-temperature antifreeze and low-temperature antifreeze; the first four-way reversing valve 10 is a water valve for switching the current water circuit position; the battery 11 is a power battery 11; the kettle 12 is a device for water replenishment and expansion of the antifreeze circuit; the battery water pump 13 is a power device for driving the battery circuit to flow and exchange heat; the second four-way reversing valve 14 is a water valve for switching the current water circuit position; the motor water pump 15 is a power device for driving the motor circuit to flow and exchange heat; the three-way proportional valve 16 is a three-way water valve with adjustable proportion; the battery electronic expansion valve 17 can control different flow rates and low pressures by controlling the valve core opening to achieve a throttling effect; the battery cooling plate heat exchanger 18 is a plate heat exchanger for heat exchange between high-temperature antifreeze and refrigerant;

[0029] More specifically, the heater core water outlet temperature sensor 19 can collect the temperature value of the water outlet of the heater core 20; the heater core 20 is a heat exchange core that brings heat from the high-temperature antifreeze to the passenger compartment through the air; the evaporator 21 is a heat exchange core that cools the passenger compartment by absorbing the heat of the air through evaporation of the low-pressure refrigerant; the refrigeration electronic expansion valve 22 can control different flow rates and low pressures by controlling the valve core opening to achieve a throttling effect; the blower 23 can make the air in the passenger compartment pass through the heater core 20 and the evaporator 21 for heat exchange; the electric compressor 24 can compress the low-pressure and low-temperature refrigerant to become a power device for high-temperature and high-pressure gaseous refrigerant; the low-pressure pressure sensor 25 can collect the current The pressure of the refrigerant is used for system control; the gas-liquid separator 26 can separate the inflowing gas-liquid mixed refrigerant into gas and liquid, thereby flowing out the gaseous refrigerant, and can also store the liquid refrigerant; the parallel stop valve 27 can realize the on-off of the parallel circuit by switching this refrigerant valve; the heat pump stop valve 28 is used to switch the on-off of the refrigerant circuit to realize the heat pump heating working mode; the check valve 29 can use the pressure difference on both sides to realize a one-way conductive and one-way cut-off mechanical refrigerant valve; the electric drive device 30 is a heat dissipation component such as a motor and electronic control; the external exchange outlet pressure temperature sensor 31 can collect the current refrigerant pressure and temperature for system control; the three-way reversing valve 32 can switch the direction of the water flow branch to realize a short-circuit bypass of the low-temperature water tank.

[0030] The control method of the heat pump system can be used for six heat pump heating working modes, one of which is a dual-heat source heat pump heating working mode, which is applied to the scenario of providing heat to the first heating circuit, evaporating and absorbing heat from the first battery circuit, and reducing the heat of the battery 11;

[0031] The dual-heat-source heat pump heating working mode is realized mainly by controlling the first refrigerant circuit, the first heating circuit, the first battery circuit and the first motor circuit;

[0032] Specifically: the first refrigerant circuit: electric compressor 24-water-cooled condenser 6-pressure temperature sensor 5-heat pump electronic expansion valve 4-outdoor heat exchanger 2-external exchange outlet pressure temperature sensor 31-check valve 29-battery electronic expansion valve 17-battery cooling plate heat exchanger 18-gas-liquid separator 26-low-pressure pressure sensor 25-electric compressor 24, the electric compressor 24 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and heat is brought to the first heating circuit through heat exchange through the water-cooled condenser 6. After condensation, the gas-liquid mixed refrigerant with a certain degree of supercooling is reduced in pressure through the throttling of the heat pump electronic expansion valve 4, absorbs heat from the air through the outdoor heat exchanger 2, and is throttled to a low-pressure refrigerant through the battery electronic expansion valve 17, flows through the battery cooling plate heat exchanger 18 to evaporate and absorb heat from the first battery circuit, and the refrigerant returns to the electric compressor 24 after passing through the gas-liquid separator 26;

[0033] The first heating circuit: heating water pump 7-water-cooled condenser 6-water heater 8-warm air core 20-three-way proportional valve 16-heating water pump 7. The heating water pump 7 brings the medium-low temperature antifreeze to the water-cooled condenser 6 and then takes away the refrigerant heat. After passing through the water heater 8 (electric heating can be performed according to the heat demand), it enters the warm air core 20 to heat the cold air brought by the blower 23. After the heat exchange, the antifreeze flows back to the heating water pump 7 through the three-way proportional valve 16;

[0034] First battery circuit: battery water pump 13-battery 11-first four-way reversing valve 10-battery heating plate heat exchanger 9-battery cooling plate heat exchanger 18-second four-way reversing valve 14-battery water pump 13. The battery water pump 13 brings the antifreeze to the battery 11, takes away the heat by convection, passes through the small circulation working mode of the first four-way reversing valve 10, flows to the battery heating plate heat exchanger 9, and then enters the battery cooling plate heat exchanger 18 to bring the heat into the first refrigerant circuit through heat exchange. The antifreeze after heat dissipation flows through the small circulation working mode of the second four-way reversing valve 14 and returns to the battery water pump 13;

[0035] The first motor circuit: motor water pump 15 - electric drive device 30 - three-way reversing valve 32 - low-temperature radiator 1 - first four-way reversing valve 10 - second four-way reversing valve 14 - motor water pump 15, the motor is cooled or heat-averaged in a large cycle and does not participate in heat recovery in this working mode.

[0036] The second working mode is the motor waste heat heat pump working mode, which is used to provide heat to the second heating circuit, evaporate and absorb the heat of the second motor circuit, and bring the heat to the second refrigerant circuit;

[0037] The motor waste heat heat pump working mode is realized mainly by controlling the second refrigerant circuit, the second heating circuit, the second battery circuit and the second motor circuit;

[0038] Specifically: the second refrigerant circuit: electric compressor 24-water-cooled condenser 6-pressure temperature sensor 5-heat pump electronic expansion valve 4-outdoor heat exchanger 2-external exchange outlet pressure temperature sensor 31-check valve 29-battery electronic expansion valve 17-battery cooling plate heat exchanger 18-gas-liquid separator 26-low-pressure pressure sensor 25-electric compressor 24, the electric compressor 24 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and carries out heat exchange through the water-cooled condenser 6 to bring the heat to the second heating circuit. After condensation, the gas-liquid mixed refrigerant with a certain degree of supercooling is reduced in pressure through the throttling of the heat pump electronic expansion valve 4, absorbs heat from the air through the outdoor heat exchanger 2, and is throttled to a low-pressure refrigerant through the battery electronic expansion valve 17, flows through the battery cooling plate heat exchanger 18 to evaporate and absorb heat from the second motor circuit, and the refrigerant returns to the electric compressor 24 after passing through the gas-liquid separator 26;

[0039] The second heating circuit: heating water pump 7-water-cooled condenser 6-water heater 8-warm air core 20-warm air outlet temperature sensor 19-three-way proportional valve 16-heating water pump 7. The heating water pump 7 brings the medium-low temperature antifreeze to the water-cooled condenser 6 and takes away the refrigerant heat. After passing through the water heater 8 (electric heating can be performed according to the heat demand), it enters the warm air core 20 to heat the cold air brought by the blower 23. After the heat exchange, the antifreeze flows back to the heating water pump 7 through the three-way proportional valve 16;

[0040] Second battery circuit: battery water pump 13 battery 11-first four-way reversing valve 10-second four-way reversing valve 14-battery water pump 13. In this working mode, the battery 11 has no residual heat or no heating or cooling requirements and is in a self-circulating heat-averaging state;

[0041] The second motor circuit: motor water pump 15-electric drive device 30-three-way reversing valve 32-first four-way reversing valve 10-battery heating plate heat exchanger 9-battery cooling plate heat exchanger 18-second four-way reversing valve 14-motor water pump 15. The antifreeze liquid is brought into the electric drive device 30 through the motor water pump 15, flows through the bypass working mode branch of the three-way reversing valve 32, and directly flows to the first four-way reversing valve 10 in the large circulation working mode to bring the high-temperature antifreeze liquid into the battery heating plate heat exchanger 9 and then flows to the battery cooling plate heat exchanger 18, and brings the heat to the second refrigerant circuit through heat exchange.

[0042] The third working mode is the air source heat pump heating working mode, which is used to provide heat to the third heating loop;

[0043] The air source heat pump heating working mode is realized mainly by controlling the third refrigerant circuit, the third heating circuit and the first heating circuit branch;

[0044] Specifically: the third refrigerant circuit: electric compressor 24-water-cooled condenser 6-pressure temperature sensor 5-heat pump electronic expansion valve 4-outdoor heat exchanger 2-external exchange outlet pressure temperature sensor 31-heat pump stop valve 28-gas-liquid separator 26-low-pressure pressure sensor 25-electric compressor 24, the electric compressor 24 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and heat is brought to the third heating circuit through heat exchange through the water-cooled condenser 6. After condensation, the gas-liquid mixed refrigerant with a certain degree of subcooling is reduced in pressure through the throttling of the heat pump electronic expansion valve 4, absorbs heat from the air through the outdoor heat exchanger 2, flows to the gas-liquid separator 26 after passing through the heat pump stop valve 28, and returns to the electric compressor 24 after passing through the gas-liquid separator 26;

[0045] The third heating circuit: heating water pump 7-water-cooled condenser 6-water heater 8-heating core 20-heating core outlet water temperature sensor 19-three-way proportional valve 16-battery heating plate heat exchanger 9-heating water pump 7. The heating water pump 7 brings the medium and low temperature antifreeze to the water-cooled condenser 6 and takes away the refrigerant heat. After passing through the water heater 8 (electric heating can be performed according to the heat demand), it enters the heating core 20 to heat the cold air brought by the blower 23. After the heat exchange, the antifreeze flows to the battery heating plate heat exchanger 9 through the three-way proportional valve 16 and finally flows back to the heating water pump 7.

[0046] The first heating circuit branch: heating water pump 7 - water-cooled condenser 6 - water-heating heater 8 - warm air core 20 - warm core water outlet temperature sensor 19 - three-way proportional valve 16 - heating water pump 7; in this working mode, the battery 11 has no residual heat heating or cooling, and the motor has no residual heat or cooling.

[0047] The fourth working mode is the heat pump parallel dehumidification working mode, which is used to provide heat to the fourth heating circuit;

[0048] The parallel dehumidification working mode of the heat pump is realized mainly by controlling the fourth refrigerant circuit, the first refrigerant circuit branch, the fourth heating circuit and the second heating circuit branch;

[0049] Specifically: the fourth refrigerant circuit: electric compressor 24-water-cooled condenser 6-pressure temperature sensor 5-heat pump electronic expansion valve 4-outdoor heat exchanger 2-external exchange outlet pressure temperature sensor 31-heat pump stop valve 28-gas-liquid separator 26-low-pressure pressure sensor 25-electric compressor 24, the electric compressor 24 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and heat is brought to the fourth heating circuit through heat exchange through the water-cooled condenser 6. After condensation, the gas-liquid mixed refrigerant with a certain degree of subcooling is reduced in pressure through the throttling of the heat pump electronic expansion valve 4, absorbs heat from the air through the outdoor heat exchanger 2, flows to the gas-liquid separator 26 after passing through the heat pump stop valve 28, and returns to the electric compressor 24 after passing through the gas-liquid separator 26;

[0050] The first refrigerant circuit branch: electric compressor 24-water-cooled condenser 6-pressure temperature sensor 5-parallel stop valve 27-check valve 29-refrigeration electronic expansion valve 22-evaporator 21-gas-liquid separator 26-low-pressure pressure sensor 25, the electric compressor 24 compresses the low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant, and heat is brought to the fourth heating circuit through heat exchange through the water-cooled condenser 6. After condensation, the gas-liquid mixed refrigerant with a certain degree of supercooling flows to the refrigeration electronic expansion valve 22 through the parallel stop valve 27. The low-pressure gaseous refrigerant after throttling enters the core of the evaporator 21 for evaporation and heat absorption, and the high-humidity gas blown in by the blower 23 is condensed and dehumidified, and the low-temperature and low-pressure gaseous refrigerant returns to the gas-liquid separator 26;

[0051] The fourth heating circuit: heating water pump 7-water-cooled condenser 6-water heater 8-heating core 20-heating core water outlet temperature sensor 19-three-way proportional valve 16-battery heating plate heat exchanger 9-heating water pump 7. The heating water pump 7 brings the medium and low temperature antifreeze to the water-cooled condenser 6 and takes away the refrigerant heat. After passing through the water heater 8 (electric heating can be performed according to the heat demand), it enters the heating core 20 to heat the cold air brought by the blower 23. After the heat exchange, the antifreeze flows to the battery heating plate heat exchanger 9 through the three-way proportional valve 16 and finally flows back to the heating water pump 7.

[0052] The second heating circuit branch: heating water pump 7-water-cooled condenser 6-water-heating heater 8-warm air core 20-warm air outlet water temperature sensor 19-three-way proportional valve 16-heating water pump 7. After the fourth heating circuit passes through the warm air core 20, it flows directly back to the heating water pump 7 through the three-way proportional valve 16. In this working mode, the battery 11 has no waste heat for heating and cooling, and the motor has no waste heat for cooling.

[0053] The fifth working mode is the heat pump series dehumidification working mode, which is used to provide heat to the fifth heating circuit;

[0054] The heat pump series dehumidification working mode is realized mainly by controlling the fifth refrigerant circuit, the fifth heating circuit and the third heating circuit branch;

[0055] Specifically: the fifth refrigerant circuit: electric compressor 24-water-cooled condenser 6-pressure temperature sensor 5-heat pump electronic expansion valve 4-outdoor heat exchanger 2-external exchange outlet pressure temperature sensor 31-heat pump stop valve 28-gas-liquid separator 26-low-pressure pressure sensor 25-electric compressor 24, the electric compressor 24 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and heat is brought to the fifth heating circuit through heat exchange through the water-cooled condenser 6. After condensation, the gas-liquid mixed refrigerant with a certain degree of subcooling is reduced in pressure through the throttling of the heat pump electronic expansion valve 4, absorbs heat from the air through the outdoor heat exchanger 2, passes through the heat pump stop valve 28, and then flows into the gas-liquid separator 26, and then returns to the electric compressor 24 after passing through the gas-liquid separator 26;

[0056] The fifth heating circuit: heating water pump 7-water-cooled condenser 6-water heater 8-heating core 20-heating core outlet water temperature sensor 19-three-way proportional valve 16-battery heating plate heat exchanger 9-heating water pump 7. The heating water pump 7 brings the medium and low temperature antifreeze to the water-cooled condenser 6 and takes away the refrigerant heat. After passing through the water heater 8 (electric heating can be performed according to the heat demand), it enters the heating core 20 to heat the cold air brought by the blower 23. After the heat exchange, the antifreeze flows to the battery heating plate heat exchanger 9 through the three-way proportional valve 16 and finally flows back to the heating water pump 7.

[0057] The third heating circuit branch: heating water pump 7-water-cooled condenser 6-water-heating heater 8-warm air core 20-warm air outlet water temperature sensor 19-three-way proportional valve 16-heating water pump 7. After the fifth heating circuit passes through the warm air core 20, it flows directly back to the heating water pump 7 through the three-way proportional valve 16. In this working mode, the battery 11 has no waste heat for heating and cooling, and the motor has no waste heat for cooling.

[0058] The sixth working mode is the heat pump waste heat recovery working mode, which is used to provide heat to the sixth heating circuit and absorb the heat of the corresponding motor circuit by evaporation;

[0059] The heat pump waste heat recovery working mode is realized mainly by controlling the sixth refrigerant circuit, the sixth heating circuit and the battery and electric drive series circuit;

[0060] Specifically: the sixth refrigerant circuit: electric compressor 24-water-cooled condenser 6-pressure temperature sensor 5-heat pump electronic expansion valve 4-outdoor heat exchanger 2-external exchange outlet pressure temperature sensor 31-check valve 29-battery electronic expansion valve 17-battery cooling plate heat exchanger 18-gas-liquid separator 26-low-pressure pressure sensor 25-electric compressor 24, the electric compressor 24 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and carries out heat exchange through the water-cooled condenser 6 to bring the heat to the sixth heating circuit. After condensation, the gas-liquid mixed refrigerant with a certain degree of supercooling is reduced in pressure through the throttling of the heat pump electronic expansion valve 4, absorbs heat from the air through the outdoor heat exchanger 2, and is throttled to a low-pressure refrigerant through the battery electronic expansion valve 17, flows through the battery cooling plate heat exchanger 18 to evaporate and absorb the heat of the corresponding motor circuit, and the refrigerant returns to the electric compressor 24 after passing through the gas-liquid separator 26;

[0061] The sixth heating circuit: heating water pump 7-water-cooled condenser 6-water heater 8-warm air core 20-warm air outlet water temperature sensor 19-three-way proportional valve 16-battery heating plate heat exchanger 9-heating water pump 7. The heating water pump 7 brings the medium-low temperature antifreeze to the water-cooled condenser 6 and takes away the refrigerant heat. After passing through the water heater 8 (electric heating can be performed according to the heat demand), it enters the warm air core 20 to heat the cold air brought by the blower 23. After the heat exchange, the antifreeze flows to the battery heating plate heat exchanger 9 through the three-way proportional valve 16 and finally flows back to the heating water pump 7.

[0062] Battery and electric drive series circuit: motor water pump 15-electric drive device 30-three-way reversing valve 32-first four-way reversing valve 10-second four-way reversing valve 14-battery water pump 13-battery 11-battery heating plate heat exchanger 9-battery cooling plate heat exchanger 18-second four-way reversing valve 14-battery water pump 13-battery 11-first four-way reversing valve 10-second four-way reversing valve 14-motor water pump 15. The motor water pump 15 brings the antifreeze to the electric drive device 30 to absorb heat, passes through the bypass branch of the three-way reversing valve 32, and flows through the first The large circulation working mode loop of the four-way reversing valve 10 passes through the small circulation working mode loop of the second four-way reversing valve 14, and brings heat to the battery 11 through the battery water pump 13, so as to heat and keep the battery 11 warm. Then, it flows to the large circulation working mode loop of the first four-way reversing valve 10, and brings the antifreeze through the battery heating plate heat exchanger 9, and exchanges heat with the refrigerant side through the battery cooling plate heat exchanger 18 to dissipate heat. After the heat exchange, the antifreeze passes through the small circulation working mode loop of the second four-way reversing valve 14, and finally flows back to the motor water pump 15.

[0063] In summary, the present invention solves the shortcomings of the current heat pump air-conditioning system, such as narrow operating boundary and low low-temperature energy efficiency ratio. At relatively low temperature, such as -20°C, the heat pump not only absorbs heat from the ambient air through the outdoor heat exchanger 2, but also recovers heat from the motor and battery circuit. The operating boundary drops from -10°C to -20°C or even lower, and the energy efficiency ratio at -10°C is increased from 1.5 to about 2.0; the present invention also solves the problem that the current waste heat utilization method can only use low-efficiency heat exchange through temperature difference, the operating conditions are limited, and the use scenario of heating the battery 11 by motor heat is limited. The heat pump can recover the heat of the motor, and the recovered heat can be used for heating the passenger compartment as well as for heating the battery 11; the present invention also solves the system design redundancy problem of the current waste heat recovery heat pump, realizes the switching and heat utilization of the battery 11 motor circuit through the water circuit integrated design, and realizes heat absorption of the air heat source and the waste hot water heat source heat pump at a relatively low temperature. The dedicated heat recovery plate exchanger of the refrigerant circuit is reduced, the four-way reversing and the corresponding valve group are reduced, and the number of system parts is reduced overall, resulting in reduced weight and cost, and increased reliability. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A heat pump system for efficient waste heat utilization, characterized in that: The invention comprises an electric compressor, a water-cooled condenser, an outdoor heat exchanger, a check valve, a battery cooling plate heat exchanger and a gas-liquid separator which are connected in sequence through a pipeline cycle, wherein the pipeline between the outdoor heat exchanger and the water-cooled condenser and the pipeline between the check valve and the battery cooling plate heat exchanger are connected through parallel pipelines, the pipeline between the outdoor heat exchanger and the check valve and the gas-liquid separator are connected through pipelines, the pipeline between the check valve and the battery cooling plate heat exchanger and the gas-liquid separator are connected through pipelines, and an evaporator is provided on the pipeline; It also includes a heating water pump, a water-cooled condenser, a water-heating heater, a heater core, a three-way proportional valve and a battery heating plate heat exchanger which are sequentially connected through a pipeline circulation, and a circulation branch is provided between the third port of the three-way proportional valve and the heating water pump; It also includes a first four-way reversing valve, a second four-way reversing valve, a battery water pump, a battery, a motor water pump, an electric drive device and a low-temperature radiator, wherein the first port of the first four-way reversing valve is connected to the battery heating plate heat exchanger, the battery cooling plate heat exchanger and the first port of the second four-way reversing valve in sequence through pipelines, the second port of the second four-way reversing valve is connected to the battery water pump, the battery and the second port of the first four-way reversing valve in sequence through pipelines, the third port of the second four-way reversing valve is connected to the motor water pump, the electric drive device, the three-way reversing valve, the low-temperature radiator and the third port of the first four-way reversing valve in sequence through pipelines, the fourth port of the first four-way reversing valve is connected to the fourth port of the second four-way reversing valve through a pipeline, and the pipeline between the low-temperature radiator and the first four-way reversing valve is connected to the third port of the three-way reversing valve through a pipeline; A pressure and temperature sensor and a heat pump electronic expansion valve are provided in sequence on the pipeline between the water-cooled condenser and the outdoor heat exchanger, a parallel stop valve is provided on the parallel pipeline, and an external heat exchange outlet pressure and temperature sensor is provided on the pipeline between the outdoor heat exchanger and the check valve; A heat pump stop valve is provided on the pipeline between the external exchange outlet pressure temperature sensor and the gas-liquid separator, a battery electronic expansion valve is provided on the pipeline between the check valve and the battery cooling plate heat exchanger, a low-pressure pressure sensor is provided on the pipeline between the gas-liquid separator and the electric compressor, and a heater core water outlet temperature sensor is provided on the pipeline between the heater core and the three-way proportional valve.

2. A heat pump system for efficient waste heat utilization according to claim 1, characterized in that: It also includes a kettle, a fan for making air flow through a low-temperature radiator and an outdoor heat exchanger for heat exchange, and a blower for making air flow through an evaporator and a heater core. The first port of the kettle is connected to a port of the battery heating plate heat exchanger through a pipeline, the second port of the kettle is respectively connected to a port of the low-temperature radiator and a port of the water heater through pipelines, the third port of the kettle is connected to a port of the battery water pump through a pipeline, the fourth port of the kettle is connected to the pipeline between the battery and the battery water pump, and the pipeline between the first four-way reversing valve and the second four-way reversing valve, and the fourth port of the kettle is also connected to a port of the heating water pump through a pipeline.

3. A control method for a heat pump system with high efficiency waste heat utilization, characterized in that: Used to control the heat pump system for efficient waste heat utilization as described in any one of claims 1-2, the method comprising: controlling the heat pump system to be in a dual-heat source heat pump heating working mode through a first refrigerant circuit, a first heating circuit, a first battery circuit and a first motor circuit; The first refrigerant circuit includes an electric compressor, a water-cooled condenser, a pressure and temperature sensor, a heat pump electronic expansion valve, an outdoor heat exchanger, an external exchange outlet pressure and temperature sensor, a check valve, a battery electronic expansion valve, a battery cooling plate heat exchanger, a gas-liquid separator, a low-pressure pressure sensor, and an electric compressor; wherein the electric compressor compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and brings the heat to the first heating circuit through heat exchange through the water-cooled condenser. The throttling pressure of the gas-liquid mixed refrigerant after condensation is reduced through the throttling pressure of the heat pump electronic expansion valve, and after absorbing heat from the air through the outdoor heat exchanger, it is throttled to a low-pressure refrigerant through the battery electronic expansion valve, flows through the battery cooling plate heat exchanger to evaporate and absorb the heat of the first battery circuit, and the refrigerant returns to the electric compressor after passing through the gas-liquid separator; The first heating circuit includes a heating water pump, a water-cooled condenser, a water-heating heater, a heating core, a three-way proportional valve, and a heating water pump; wherein the heating water pump brings the medium- and low-temperature antifreeze to the water-cooled condenser and then takes away the heat of the refrigerant, and then enters the heating core after passing through the water-heating heater to heat the cold air brought by the blower, and the antifreeze after heat exchange flows back to the heating water pump through the three-way proportional valve; The first battery circuit includes a battery water pump, a battery, a first four-way reversing valve, a battery heating plate heat exchanger, a battery cooling plate heat exchanger, a second four-way reversing valve, and a battery water pump; wherein the battery water pump brings antifreeze to the battery, takes away heat by convection, flows to the battery heating plate heat exchanger through the first four-way reversing valve, enters the battery cooling plate heat exchanger, and brings heat into the first refrigerant circuit through heat exchange, and the antifreeze after heat dissipation flows through the second four-way reversing valve back to the battery water pump; The first motor circuit includes a motor water pump, an electric drive device, a three-way reversing valve, a low-temperature radiator, a first four-way reversing valve, a second four-way reversing valve, and a motor water pump, so as to achieve large-cycle cooling or heat equalization of the motor.

4. A control method for a heat pump system with high efficiency waste heat utilization, characterized in that: Used to control the heat pump system for efficient waste heat utilization as described in any one of claims 1-2, the method comprising: controlling the heat pump system to be in a motor waste heat heat pump working mode through a second refrigerant circuit, a second heating circuit, a second battery circuit, and a second motor circuit; The second refrigerant circuit includes an electric compressor, a water-cooled condenser, a pressure and temperature sensor, a heat pump electronic expansion valve, an outdoor heat exchanger, an external exchange outlet pressure and temperature sensor, a check valve, a battery electronic expansion valve, a battery cooling plate heat exchanger, a gas-liquid separator, a low-pressure pressure sensor, and an electric compressor; wherein the electric compressor compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and brings the heat to the second heating circuit through heat exchange through the water-cooled condenser. The condensed gas-liquid mixed refrigerant is throttled to reduce pressure through the heat pump electronic expansion valve, absorbs heat from the air through the outdoor heat exchanger, and is throttled to a low-pressure refrigerant through the battery electronic expansion valve, flows through the battery cooling plate heat exchanger to evaporate and absorb heat from the second motor circuit, and the refrigerant returns to the electric compressor after passing through the gas-liquid separator; The second heating circuit includes a heating water pump, a water-cooled condenser, a water heater, a heater core, a heater core outlet water temperature sensor, a three-way proportional valve, and a heating water pump; wherein the heating water pump brings the medium- and low-temperature antifreeze to the water-cooled condenser and then takes away the refrigerant heat, and then enters the heater core after passing through the water heater to heat the cold air brought by the blower, and the antifreeze after heat exchange flows back to the heating water pump through the three-way proportional valve; The second battery circuit includes a battery water pump, a battery, a first four-way reversing valve, a second four-way reversing valve, and a battery water pump, so that the battery has no residual heat or no heating or cooling requirements and is in a self-circulating heat-averaging state; The second motor circuit includes a motor water pump, an electric drive device, a three-way reversing valve, a first four-way reversing valve, a battery heating plate heat exchanger, a battery cooling plate heat exchanger, a second four-way reversing valve, and a motor water pump; wherein the antifreeze is brought into the electric drive device through the motor water pump, flows through the bypass branch of the three-way reversing valve, and directly flows to the first four-way reversing valve, brings the high-temperature antifreeze into the battery heating plate heat exchanger, and then flows to the battery cooling plate heat exchanger, bringing heat to the second refrigerant circuit through heat exchange.

5. A control method for a heat pump system with high efficiency waste heat utilization, characterized in that: Used to control the heat pump system for efficient waste heat utilization as described in any one of claims 1-2, the method comprising: controlling the heat pump system to be in an air source heat pump heating working mode through a third refrigerant circuit, a third heating circuit and a first heating circuit branch; The third refrigerant circuit includes an electric compressor, a water-cooled condenser, a pressure and temperature sensor, a heat pump electronic expansion valve, an outdoor heat exchanger, an external exchange outlet pressure and temperature sensor, a heat pump stop valve, a gas-liquid separator, a low-pressure pressure sensor, and an electric compressor; wherein the electric compressor compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and brings the heat to the third heating circuit through heat exchange through the water-cooled condenser. The throttling pressure of the gas-liquid mixed refrigerant after condensation is reduced through the heat pump electronic expansion valve, and after absorbing heat from the air through the outdoor heat exchanger, it flows to the gas-liquid separator after passing through the heat pump stop valve, and returns to the electric compressor after passing through the gas-liquid separator; The third heating circuit includes a heating water pump, a water-cooled condenser, a water-heating heater, a heater core, a heater core outlet water temperature sensor, a three-way proportional valve, a battery heating plate heat exchanger, and a heating water pump; wherein the heating water pump brings the medium- and low-temperature antifreeze to the water-cooled condenser and then takes away the refrigerant heat, and then enters the heater core after passing through the water-heating heater to heat the cold air brought by the blower. After the heat exchange, the antifreeze flows to the battery heating plate heat exchanger through the three-way proportional valve and finally flows back to the heating water pump; The first heating circuit branch includes a heating water pump, a water-cooled condenser, a water-heating heater, a heater core, a heater core water outlet temperature sensor, a three-way proportional valve, and a heating water pump, so that the battery can be heated and cooled without residual heat, and the motor can be cooled without residual heat.

6. A control method for a heat pump system with high efficiency waste heat utilization, characterized in that: For controlling the heat pump system for efficient waste heat utilization as described in any one of claims 1-2, the method comprises: controlling the heat pump system to be in a heat pump parallel dehumidification working mode through a fourth refrigerant circuit, a first refrigerant circuit branch, a fourth heating circuit, and a second heating circuit branch; The fourth refrigerant circuit includes an electric compressor, a water-cooled condenser, a pressure and temperature sensor, a heat pump electronic expansion valve, an outdoor heat exchanger, an external exchange outlet pressure and temperature sensor, a heat pump stop valve, a gas-liquid separator, a low-pressure pressure sensor, and an electric compressor; wherein the electric compressor compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and brings the heat to the fourth heating circuit through heat exchange through the water-cooled condenser. The throttling pressure of the gas-liquid mixed refrigerant after condensation is reduced through the heat pump electronic expansion valve, and after absorbing heat from the air through the outdoor heat exchanger, it flows to the gas-liquid separator after passing through the heat pump stop valve, and returns to the electric compressor after passing through the gas-liquid separator; The first refrigerant circuit branch includes an electric compressor, a water-cooled condenser, a pressure and temperature sensor, a parallel stop valve, a check valve, a refrigeration electronic expansion valve, an evaporator, a gas-liquid separator, and a low-pressure pressure sensor; wherein the electric compressor compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and brings the heat to the fourth heating circuit through heat exchange through the water-cooled condenser. The condensed gas-liquid mixed refrigerant flows to the refrigeration electronic expansion valve through the parallel stop valve, and the low-pressure gaseous refrigerant after throttling enters the evaporator core for evaporation and heat absorption, and the high-humidity gas blown in by the blower is condensed and dehumidified, and the low-temperature and low-pressure gaseous refrigerant returns to the gas-liquid separator; The fourth heating circuit includes a heating water pump, a water-cooled condenser, a water-heating heater, a heater core, a heater core outlet water temperature sensor, a three-way proportional valve, a battery heating plate heat exchanger, and a heating water pump; wherein the heating water pump brings the medium- and low-temperature antifreeze to the water-cooled condenser and then takes away the refrigerant heat, and then enters the heater core after passing through the water-heating heater to heat the cold air brought by the blower. After the heat exchange, the antifreeze flows to the battery heating plate heat exchanger through the three-way proportional valve and finally flows back to the heating water pump; The second heating circuit branch includes a heating water pump, a water-cooled condenser, a water-heating heater, a heater core, a heater core water outlet temperature sensor, a three-way proportional valve, and a heating water pump, so that the battery can be heated and cooled without residual heat, and the motor can be cooled without residual heat.

7. A control method for a heat pump system with high efficiency waste heat utilization, characterized in that: Used to control the heat pump system for efficient waste heat utilization as described in any one of claims 1-2, the method comprising: controlling the heat pump system to be in a heat pump series dehumidification working mode through a fifth refrigerant circuit, a fifth heating circuit and a third heating circuit branch; The fifth refrigerant circuit includes an electric compressor, a water-cooled condenser, a pressure and temperature sensor, a heat pump electronic expansion valve, an outdoor heat exchanger, an external exchange outlet pressure and temperature sensor, a heat pump stop valve, a gas-liquid separator, a low-pressure pressure sensor, and an electric compressor; wherein the electric compressor compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and brings the heat to the fifth heating circuit through heat exchange through the water-cooled condenser. The throttling pressure of the gas-liquid mixed refrigerant after condensation is reduced through the heat pump electronic expansion valve, and after absorbing heat from the air through the outdoor heat exchanger, it passes through the gas-liquid separator after the heat pump stop valve, and then returns to the electric compressor after passing through the gas-liquid separator; The fifth heating circuit includes a heating water pump, a water-cooled condenser, a water-heating heater, a heater core, a heater core outlet water temperature sensor, a three-way proportional valve, a battery heating plate heat exchanger, and a heating water pump; wherein the heating water pump brings the medium- and low-temperature antifreeze to the water-cooled condenser and then takes away the refrigerant heat, and then enters the heater core after passing through the water-heating heater to heat the cold air brought by the blower. After the heat exchange, the antifreeze flows to the battery heating plate heat exchanger through the three-way proportional valve and finally flows back to the heating water pump; The third heating circuit branch includes a heating water pump, a water-cooled condenser, a water-heating heater, a heater core, a heater core water outlet temperature sensor, a three-way proportional valve, and a heating water pump; wherein, after the fifth heating circuit passes through the heater core, it flows directly back to the heating water pump through the three-way proportional valve, so that the battery can be heated and cooled without waste heat, and the motor can be cooled without waste heat.

8. A control method for a heat pump system with high efficiency waste heat utilization, characterized in that: For controlling a heat pump system for efficient waste heat utilization as claimed in any one of claims 1 to 2, the method comprising: controlling the heat pump system to be in a heat pump waste heat recovery working mode through a sixth refrigerant circuit, a sixth heating circuit and a battery and electric drive series circuit; The sixth refrigerant circuit includes an electric compressor, a water-cooled condenser, a pressure and temperature sensor, a heat pump electronic expansion valve, an outdoor heat exchanger, an external exchange outlet pressure and temperature sensor, a check valve, a battery electronic expansion valve, a battery cooling plate heat exchanger, a gas-liquid separator, a low-pressure pressure sensor, and an electric compressor; wherein the electric compressor compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, and brings the heat to the sixth heating circuit through heat exchange through the water-cooled condenser. The condensed gas-liquid mixed refrigerant is throttled to reduce its pressure through the heat pump electronic expansion valve, absorbs heat from the air through the outdoor heat exchanger, and is throttled to a low-pressure refrigerant through the battery electronic expansion valve. It flows through the battery cooling plate heat exchanger to evaporate and absorb the heat of the corresponding motor circuit, and the refrigerant returns to the electric compressor after passing through the gas-liquid separator; The sixth heating circuit includes a heating water pump, a water-cooled condenser, a water-heating heater, a heater core, a heater core outlet water temperature sensor, a three-way proportional valve, a battery heating plate heat exchanger, and a heating water pump; wherein the heating water pump brings the medium- and low-temperature antifreeze to the water-cooled condenser and then takes away the refrigerant heat, and then enters the heater core after passing through the water-heating heater to heat the cold air brought by the blower. After the heat exchange, the antifreeze flows to the battery heating plate heat exchanger through the three-way proportional valve and finally flows back to the heating water pump; The battery and electric drive series circuit includes a motor water pump, an electric drive device, a three-way reversing valve, a first four-way reversing valve, a second four-way reversing valve, a battery water pump, a battery, a battery heating plate heat exchanger, a battery cooling plate heat exchanger, a second four-way reversing valve, a battery water pump, a battery, a first four-way reversing valve, a second four-way reversing valve, and a motor water pump; wherein the motor water pump brings antifreeze to the electric drive device to absorb heat, passes through a bypass branch of the three-way reversing valve, flows through the first four-way reversing valve and the second four-way reversing valve, brings heat to the battery through the battery water pump, heats and keeps the battery warm, then flows to the first four-way reversing valve, brings the antifreeze through the battery heating plate heat exchanger, exchanges heat with the refrigerant side through the battery cooling plate heat exchanger to dissipate heat, and the antifreeze after heat exchange passes through the second four-way reversing valve and finally flows back to the motor water pump.

Images