A new energy vehicle R290 refrigerant-based thermal management water system

Abstract

The application relates to the field of new energy vehicle thermal management technology and belongs to a thermal management water system based on a new energy vehicle R290 refrigerant, which can realize the following multiple function modes: single air conditioner refrigeration mode, single battery cooling mode, air source heat pump heating mode, water source heat pump heating mode, hot gas bypass heating mode, electric drive natural heat dissipation mode and battery natural heat dissipation mode. Compared with a traditional water system, the system provided by the application is more perfect in function, can fully utilize the battery and electric drive waste heat, and can effectively reduce system energy consumption.

Description

Technical Field

[0001] This invention relates to the field of thermal management technology for new energy vehicles, and belongs to a thermal management water system based on R290 refrigerant for new energy vehicles. Background Technology

[0002] R290 (propane), as a natural refrigerant, has shown significant application potential and broad prospects in the field of new energy vehicles. Its zero ozone depletion potential (ODP) and extremely low global warming potential (GWP=3.3)28 make it an ideal replacement for traditional high-GWP refrigerants (such as R134a). Compared to R1234yf and R744, R290 has advantages in energy efficiency and economy: its high latent heat of vaporization and small molecular weight can reduce refrigerant charge, lowering heat pump system energy consumption by about 30% and increasing the driving range of electric vehicles. Furthermore, R290's operating pressure is close to that of traditional refrigerants, eliminating the need for large-scale modifications to existing air conditioning systems and reducing costs for automakers. However, existing R290 thermal management systems in new energy vehicles often have relatively simple water-side loops, limiting their functionality and failing to fully utilize the overall system capabilities. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a heat management water system based on R290 refrigerant for new energy vehicles.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This invention provides a thermal management water system based on R290 refrigerant for new energy vehicles, including a refrigerant circuit and a coolant circuit;

[0006] The refrigerant circuit includes a compressor, a refrigerant passage for a water-cooled condenser, an internal heat exchanger, a liquid receiver, an electronic expansion valve, and a refrigerant passage for a cooler. The compressor, the refrigerant passage for a water-cooled condenser, the high-pressure side passage for the internal heat exchanger, the liquid receiver, the electronic expansion valve, the refrigerant passage for the cooler, and the low-pressure side passage for the internal heat exchanger are connected sequentially according to the refrigerant flow direction.

[0007] The refrigerant circuit and the coolant circuit are connected through a water-cooled condenser and a cooler for heat exchange. The coolant circuit consists of at least one of the following circuits: circuit one, circuit two, circuit three, circuit four, circuit five, and circuit six.

[0008] The circuit is composed of a hot water pump, a three-way valve from port a to port b, a front-end radiator, and an electric drive assembly connected in sequence according to the coolant flow direction.

[0009] The second circuit consists of, in order of coolant flow, a chilled water pump, a coolant channel of the cooler, a channel from port a to port c of the three-way valve 2, a channel from port a to port b of the three-way valve 2, and a connection to the air conditioning core.

[0010] The circuit three consists of, in order of coolant flow, a cooling water pump, a coolant channel of the cooler, a channel from port a to port c of the three-way valve, a channel from port a to port c of the three-way valve, and a connection to the power battery.

[0011] The fourth circuit consists of a battery water pump and a power battery connected sequentially according to the coolant flow direction.

[0012] The circuit five is composed of, in order of coolant flow direction, a chilled water pump, coolant passage of the cooler, passage from port a to port b of the three-way valve, front-end radiator, and electric drive assembly.

[0013] The circuit six consists of a hot water pump, a three-way valve (port a to port c), and an air conditioning heating element connected in sequence according to the coolant flow direction.

[0014] Preferably, the compressor refrigerant output end is connected to a large-diameter electronic expansion valve (ERV), and the other end of the large-diameter electronic expansion valve (ERV) is connected between the cooler refrigerant output end and the high-pressure side channel input end of the internal heat exchanger.

[0015] Preferably, the refrigerant output terminal of the liquid storage tank is equipped with a high-pressure temperature sensor (HPT).

[0016] Preferably, an electronic expansion valve is connected in parallel at both ends of the electronic expansion valve one. One end of the electronic expansion valve two is connected to the refrigerant output end of the liquid storage tank, and the other end is connected to the refrigerant output end of the cooler.

[0017] Preferably, a water temperature sensor is provided between the liquid-side input terminal of the water-cooled condenser and the coolant input terminal of the hot water pump.

[0018] Preferably, an electric fan is provided on one side of the front heat sink.

[0019] Preferably, a blower is provided on one side of the air conditioning cooling core.

[0020] This invention also provides a single-air conditioning cooling method based on a thermal management water system using R290 refrigerant in a new energy vehicle: The compressor is started, and the high-temperature, high-pressure superheated refrigerant passes through a water-cooled condenser. The water-cooled condenser participates in heat exchange, the refrigerant is condensed, and the coolant on the liquid side of the water-cooled condenser is heated. The heat follows the coolant from the liquid side of the water-cooled condenser through a water temperature sensor and a hot water pump, passing through a three-way valve from end a to end b, entering the front radiator, where it is cooled by an electric fan, and then returns to the water-cooled condenser through the electric drive assembly, completing the cooling water loop circulation. The refrigerant, after being throttled by an electronic expansion valve, enters the refrigerant side of the condenser and evaporates, absorbing heat. The coolant on the liquid side of the condenser is cooled, and the cooled coolant passes through a water temperature sensor and enters a three-way valve from end a to end c, then through a three-way valve from end a to end b, entering the air conditioning core. The blower completes the cooling of the passenger compartment, and then the coolant returns to the liquid side of the condenser via a cooling water pump.

[0021] This invention also provides a single-cell cooling method for a thermal management water system based on R290 refrigerant in new energy vehicles: The compressor is started, and the high-temperature, high-pressure superheated refrigerant passes through a water-cooled condenser. The water-cooled condenser participates in heat exchange, the refrigerant is condensed, and the coolant on the liquid side of the water-cooled condenser is heated. The heat follows the coolant from the liquid side of the water-cooled condenser through a water temperature sensor and a hot water pump, through a three-way valve from end a to end b, into the front-end radiator, where it is cooled by an electric fan, and then returns to the water-cooled condenser through the electric drive assembly, completing the cooling water loop circulation. The refrigerant, after being throttled by an electronic expansion valve, enters the coolant side of the condenser for evaporation and heat absorption. The coolant on the liquid side of the condenser is cooled, and the cooled coolant passes through a water temperature sensor and enters a three-way valve from end a to end c, then through a three-way valve from end a to end c into the power battery for heat exchange. At this time, the battery water pump is also turned on, and after cooling the battery, the coolant returns to the liquid side of the condenser via a cooling water pump.

[0022] This invention also provides an air-source heat pump heating method based on a thermal management water system using R290 refrigerant in a new energy vehicle: The compressor is started, and the high-temperature, high-pressure superheated refrigerant passes through a water-cooled condenser. The water-cooled condenser participates in heat exchange, the refrigerant is condensed, and the liquid-side coolant of the water-cooled condenser is heated. The heat follows the coolant from the liquid side of the water-cooled condenser through a water temperature sensor and a hot water pump, passing through a three-way valve from end a to end c, entering the air conditioning heating core, and completing the passenger compartment heating through a blower. The refrigerant, after being throttled by an electronic expansion valve, enters the refrigerant side of the cooler to evaporate and absorb heat. The coolant on the liquid side of the cooler is cooled, and the cooled coolant passes through a water temperature sensor and enters a three-way valve from end a to end b, entering the front radiator. It absorbs heat from the air through an electric fan, and then returns to the liquid side of the cooler through an electric drive assembly and a chilled water pump.

[0023] This invention also provides a water source heat pump heating method based on a thermal management water system using R290 refrigerant in a new energy vehicle: The compressor is started, and the high-temperature, high-pressure superheated refrigerant passes through a water-cooled condenser. The water-cooled condenser participates in heat exchange, the refrigerant is condensed, and the liquid-side coolant of the water-cooled condenser is heated. The heat follows the coolant from the liquid side of the water-cooled condenser through a water temperature sensor and a hot water pump, passing through a three-way valve from end a to end c, entering the air conditioning heating core, and completing the heating of the passenger compartment through a blower. After the refrigerant is throttled by an electronic expansion valve, it enters the refrigerant side of the cooler to evaporate and absorb heat. The coolant on the liquid side of the cooler is cooled, and the cooled coolant passes through a water temperature sensor and enters a three-way valve from end a to end c, then through a three-way valve from end a to end c to enter the power battery to absorb heat. At this time, the battery water pump is turned on, and after completing the recovery of waste heat from the battery, the coolant returns to the liquid side of the cooler through a cooling water pump.

[0024] This invention also provides a hot gas bypass heating method for a thermal management water system based on R290 refrigerant in new energy vehicles: The compressor is started, and the high-temperature, high-pressure superheated refrigerant passes through a water-cooled condenser. The water-cooled condenser participates in heat exchange, the refrigerant is condensed, and the liquid-side coolant of the water-cooled condenser is heated. The heat follows the coolant from the liquid side of the water-cooled condenser through a water temperature sensor and a hot water pump, passing through a three-way valve from end a to end c, and enters the air conditioning heating core, where the blower completes the heating of the passenger compartment. Another portion of the high-temperature, high-pressure refrigerant from the compressor returns to the low-pressure side of the internal heat exchanger through a large-diameter electronic expansion valve (ERV) for enthalpy enhancement, increasing the system's low-pressure pressure. The condensed refrigerant, after being throttled by the electronic expansion valve, enters the refrigerant side of the chiller. At this time, the cooling water pump and battery water pump are not working, and the chiller does not participate in heat exchange.

[0025] This invention also provides a method for natural cooling of an electric drive system based on R290 refrigerant in a new energy vehicle: the compressor does not need to be started. The high-temperature coolant from the electric drive assembly enters the chiller via a refrigerant pump, flows through water temperature sensor two and three-way valve two from end a to end b into the front radiator, and completes natural cooling by exchanging heat with the air through an electric fan. The cooled coolant then returns to the electric drive assembly. If the refrigerant circuit is in hot gas bypass mode at this time, to avoid the impact of the low water temperature after natural cooling of the electric drive on the refrigerant circuit, electronic expansion valve one is closed, and the refrigerant system is throttled through electronic expansion valve two.

[0026] This invention also provides a battery natural heat dissipation method based on the thermal management water system of R290 refrigerant in new energy vehicles: the compressor does not need to be started, the battery water pump is turned on, the high-temperature coolant from the power battery enters the cooler's chiller liquid level through the refrigeration water pump, then passes through the second water temperature sensor, and enters the third-way valve, which splits into two paths from end a to end b / c. One path passes through the third-way valve, returning to the power battery from end a to end c, and the other part enters the front-end radiator, where it exchanges heat with the air through an electric fan to complete natural heat dissipation. The cooled coolant passes through the electric drive assembly, merges with the water outlet from the power battery, and returns to the refrigeration water pump.

[0027] Compared with the prior art, the present invention provides a heat management water system based on R290 refrigerant for new energy vehicles, which has the following beneficial effects:

[0028] This invention utilizes a three-way valve combined with an electronic expansion valve (EXV) to bypass the chiller. By switching the water circuit through three three-way water valves, it can achieve multiple functions such as single air conditioning cooling, single battery cooling, air source heat pump heating, water source heat pump heating, hot air bypass heating, electric drive natural cooling water, and battery natural cooling. Compared with traditional water systems, the system functions are more complete, and at the same time, it makes full use of the waste heat from the battery and electric drive, which can effectively reduce the system energy consumption.

[0029] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0030] Figure 1 This is a system architecture diagram of a heat management water system based on R290 refrigerant for new energy vehicles according to the present invention;

[0031] Figure 2 This is a diagram illustrating the single-air conditioning cooling mode operation of the present invention.

[0032] Figure 3 This is a diagram illustrating the single-cell cooling mode operation of the present invention.

[0033] Figure 4 This is a diagram illustrating the operating conditions of the air source heat pump heating mode of the present invention.

[0034] Figure 5 This is a diagram illustrating the operating conditions of the water source heat pump heating mode of the present invention.

[0035] Figure 6 This is a diagram illustrating the hot gas bypass heating mode operation of the present invention.

[0036] Figure 7 This is a diagram illustrating the operating conditions of the electric drive's natural heat dissipation mode according to the present invention.

[0037] Figure 8 This is a diagram illustrating the battery's natural heat dissipation mode in this invention. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0039] See Figure 1 A heat management water system based on R290 refrigerant for new energy vehicles, including a refrigerant circuit and a coolant circuit;

[0040] The refrigerant circuit includes the refrigerant passages of compressor 1, water-cooled condenser 2, internal heat exchanger 3, liquid receiver 4, electronic expansion valve 6, and cooler 7. The refrigerant passages of compressor 1, water-cooled condenser 2, high-pressure side passage of internal heat exchanger 3, liquid receiver 4, electronic expansion valve 6, cooler 7, and low-pressure side passage of internal heat exchanger 3 are connected sequentially according to the refrigerant flow direction.

[0041] The refrigerant circuit and the coolant circuit are connected through the water-cooled condenser 2 and the cooler 7 for heat exchange. The coolant circuit is composed of at least one of the following circuits: circuit one, circuit two, circuit three, circuit four, circuit five and circuit six.

[0042] The circuit is composed of a hot water pump 12, a three-way valve 13a-b port channel, a front radiator 16, and an electric drive assembly 14 connected in sequence according to the coolant flow direction.

[0043] The second circuit is composed of the chilled water pump 20, the coolant channel of the cooler 7, the channel from port 22a to port c of the three-way valve 2, the channel from port 23a to port b of the three-way valve 2, and the air conditioning core 18, in sequence according to the coolant flow direction.

[0044] The circuit three is composed of, in order of coolant flow direction, a cooling water pump 20, a coolant channel of a cooler 7, a channel from port 22a to port c of three-way valve two, a channel from port 23a to port c of three-way valve two, and a power battery 24.

[0045] The fourth circuit is composed of a battery water pump 25 and a power battery 24 connected sequentially according to the coolant flow direction.

[0046] The circuit five is composed of the cooling water pump 20, the coolant channel of the cooler 7, the channel from port a to port b of the three-way valve 22a, the front radiator 16, and the electric drive assembly 14 connected in sequence according to the coolant flow direction.

[0047] The circuit six is ​​composed of a hot water pump 12, a three-way valve 13a-c channel, and an air conditioning heating core 17 connected in sequence according to the coolant flow direction.

[0048] Preferably, the compressor 1 is connected to a large-diameter electronic expansion valve ERV8 at its refrigerant output end, and the other end of the large-diameter electronic expansion valve ERV8 is connected between the refrigerant output end of the cooler 7 and the high-pressure side channel input end of the internal heat exchanger 3.

[0049] Preferably, the refrigerant output end of the liquid storage tank 4 is equipped with a high-pressure temperature sensor HPT5.

[0050] Preferably, an electronic expansion valve 9 is connected in parallel at both ends of the electronic expansion valve 6. One end of the electronic expansion valve 9 is connected to the refrigerant output end of the liquid storage tank 4, and the other end is connected to the refrigerant output end of the cooler 7.

[0051] Preferably, a water temperature sensor 10 is provided between the liquid-side input end of the water-cooled condenser 2 and the coolant input end of the hot water pump 12.

[0052] Preferably, an electric fan 15 is provided on one side of the front heat sink 16.

[0053] Preferably, a blower 19 is provided on one side of the air conditioning cooling core 18.

[0054] The present invention provides a heat management water system based on R290 refrigerant for new energy vehicles, whose working modes include single air conditioning cooling mode, single battery cooling mode, air source heat pump heating mode, water source heat pump heating mode, hot air bypass heating mode, electric drive natural heat dissipation mode, and battery natural heat dissipation mode.

[0055] Furthermore, the implementation process of each working mode is as follows:

[0056] See Figure 2 In single-air conditioning cooling mode: Compressor 1 is started, and the high-temperature and high-pressure superheated refrigerant passes through the water-cooled condenser 2. The water-cooled condenser 2 participates in heat exchange, and the refrigerant is condensed. The liquid-side coolant of the water-cooled condenser 2 is heated. The heat follows the coolant from the liquid side of the water-cooled condenser 2 through water temperature sensor 10 and hot water pump 12, through three-way valve 13 from end a to end b, enters the front radiator 16, dissipates heat through electric fan 15, and then returns to the water-cooled condenser 2 through electric drive assembly 14, completing the heat dissipation water circuit circulation. After the refrigerant is throttled by electronic expansion valve 6, it enters the refrigerant side of the cooler 7 to evaporate and absorb heat. The coolant on the liquid side of the cooler 7 is cooled. The cooled coolant passes through water temperature sensor 210 and enters three-way valve 22 from end a to end c, and then through three-way valve 323 from end a to end b, enters the air conditioning core 18, and completes the cooling of the passenger compartment through blower 19. Subsequently, the coolant returns to the liquid side of the cooler 7 through cooling water pump 20.

[0057] See Figure 3Single-battery cooling mode: When compressor 1 is started, the high-temperature and high-pressure superheated refrigerant passes through water-cooled condenser 2, where it participates in heat exchange. The refrigerant is condensed, and the liquid-side coolant in water-cooled condenser 2 is heated. The heat follows the coolant from the liquid side of water-cooled condenser 2 through water temperature sensor 10 and hot water pump 12, through three-way valve 13 from end a to end b, into front-end radiator 16, where it is cooled by electric fan 15, and then returns to water-cooled condenser 2 through electric drive assembly 14, completing the cooling water loop circulation. After the refrigerant is throttled by electronic expansion valve 6, it enters cooler 7 and evaporates and absorbs heat on the refrigerant side. The coolant on the liquid side of cooler 7 is cooled, and the cooled coolant passes through water temperature sensor 210 and enters three-way valve 22 from end a to end c, and then through three-way valve 323 from end a to end c into power battery 24 for heat exchange. At this time, battery water pump 25 is also turned on to cool the battery. After cooling the battery, the coolant returns to the liquid side of cooler 7 through cooling water pump 20.

[0058] See Figure 4 Air source heat pump heating mode: When compressor 1 is started, the high-temperature and high-pressure superheated refrigerant passes through water-cooled condenser 2. Water-cooled condenser 2 participates in heat exchange, the refrigerant is condensed, and the liquid-side coolant of water-cooled condenser 2 is heated. The heat follows the coolant from the liquid side of water-cooled condenser 2 through water temperature sensor 10 and hot water pump 12, through three-way valve 13 from end a to end c, and enters air conditioning heating core 17. The blower 19 completes the heating of the passenger compartment. After the refrigerant passes through electronic expansion valve 6, it enters the refrigerant side of cooler 7 to evaporate and absorb heat. The coolant on the liquid side of cooler 7 is cooled. The cooled coolant passes through water temperature sensor 210 and enters three-way valve 22 from end a to end b to enter front radiator 16. It absorbs heat from the air through electric fan 15, and then returns to the liquid side of cooler 7 through electric drive assembly 14 and cooling water pump 20.

[0059] See Figure 5 Water source heat pump heating mode: When compressor 1 is started, the high-temperature and high-pressure superheated refrigerant passes through water-cooled condenser 2, which participates in heat exchange. The refrigerant is condensed, and the liquid-side coolant of water-cooled condenser 2 is heated. The heat follows the coolant from the liquid side of water-cooled condenser 2 through water temperature sensor 10 and hot water pump 12, through three-way valve 13 from end a to end c, and enters air conditioning heating core 17. The blower 19 completes the heating of the passenger compartment. After the refrigerant is throttled by electronic expansion valve 6, it enters the refrigerant side of cooler Chiller 7 to evaporate and absorb heat. The coolant on the liquid side of cooler Chiller 7 is cooled. The cooled coolant passes through water temperature sensor 210 and enters three-way valve 22 from end a to end c, and then through three-way valve 323 from end a to end c to enter the power battery 24 to absorb heat. At this time, battery water pump 25 is turned on. After the battery waste heat is recovered, the coolant returns to the liquid side of cooler Chiller 7 through cooling water pump 20.

[0060] See Figure 6 Hot gas bypass heating mode: When compressor 1 is started, the high-temperature and high-pressure superheated refrigerant passes through water-cooled condenser 2, which participates in heat exchange. The refrigerant is condensed, and the liquid-side coolant of water-cooled condenser 2 is heated. The heat follows the coolant from the liquid side of water-cooled condenser 2 through water temperature sensor 10 and hot water pump 12, through three-way valve 13 from end a to end c, and enters the air conditioning heating core 17. The blower 19 completes the heating of the passenger compartment. Another part of the high-temperature and high-pressure refrigerant from compressor 1 returns to the low-pressure side of the internal heat exchanger through the large-diameter electronic expansion valve ERV8 to replenish gas and increase enthalpy, thereby increasing the low-pressure pressure of the system. The condensed refrigerant enters the refrigerant side of the cooler chiller 7 after being throttled by electronic expansion valve 6. At this time, the cooling water pump 20 and battery water pump 25 do not work, and the cooler chiller 7 does not participate in heat exchange.

[0061] See Figure 7 In the electric drive natural cooling mode: the compressor 1 does not need to be started. The high-temperature coolant from the electric drive assembly 14 enters the chiller 7 via the cooling water pump 20, flows through the water temperature sensor 10 and the three-way valve 22 from end a to end b, and enters the front radiator 16. It then undergoes natural cooling by exchanging heat with the air through the electric fan 15. The cooled coolant then returns to the electric drive assembly 14. If the refrigerant circuit is in hot gas bypass mode at this time, to avoid the impact of the low water temperature after the electric drive's natural cooling on the refrigerant circuit, the electronic expansion valve 6 is closed, and the refrigerant system is throttled through the electronic expansion valve 9.

[0062] See Figure 8 Battery natural cooling mode: Compressor 1 does not need to be started, battery water pump 25 is turned on, the high temperature coolant from power battery 24 enters the cooler 7 liquid level sensor through cooling water pump 20, then passes through water temperature sensor 10, and enters three-way valve 22 from end a to end b / c, splitting into two paths. One path passes through three-way valve 3 23 from end a to end c and returns to power battery 24, the other part enters the front radiator 16 and exchanges heat with the air through electric fan 15 to complete natural cooling. The cooled coolant passes through electric drive assembly 14, merges with the water outlet of power battery 24, and returns to cooling water pump 20.

[0063] This invention can achieve multiple operating functions, including single air conditioner cooling mode, single battery cooling mode, air source heat pump heating mode, water source heat pump heating mode, hot air bypass heating mode, electric drive natural heat dissipation mode, and battery natural heat dissipation mode. Compared with traditional water systems, the system has more complete functions, can fully recover the waste heat of the system's electric drive and battery, and maximize the utilization of system energy. At the same time, it can also achieve battery cooling without turning on the compressor at low ambient temperatures, which can effectively reduce system energy consumption.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heat management water system based on R290 refrigerant for new energy vehicles, characterized in that: Including refrigerant circuit and coolant circuit; The refrigerant circuit includes the refrigerant passage of the compressor (1), the water-cooled condenser (2), the internal heat exchanger (3), the liquid storage tank (4), the electronic expansion valve (6), and the refrigerant passage of the cooler (7). The refrigerant passage of the compressor (1), the water-cooled condenser (2), the high-pressure side passage of the internal heat exchanger (3), the liquid storage tank (4), the electronic expansion valve (6), the refrigerant passage of the cooler (7), and the low-pressure side passage of the internal heat exchanger (3) are connected in sequence according to the refrigerant flow direction. The refrigerant circuit and the coolant circuit are connected through a water-cooled condenser (2) and a cooler (7) for heat exchange. The coolant circuit is composed of at least one of the following circuits: circuit one, circuit two, circuit three, circuit four, circuit five and circuit six. The circuit is composed of a hot water pump (12), a three-way valve (13) from port a to port b, a front-end radiator (16), and an electric drive assembly (14) connected in sequence according to the coolant flow direction; The second circuit is composed of the cooling water pump (20), the cooling water channel of the cooler (7), the channel from port a to port c of the three-way valve two (22), the channel from port a to port b of the three-way valve three (23), and the air conditioning core (18) in sequence according to the coolant flow direction; The circuit three is composed of the cooling water pump (20), the cooling water channel of the cooler (7), the channel from port a to port c of the three-way valve two (22), the channel from port a to port c of the three-way valve three (23), and the power battery (24) in sequence according to the coolant flow direction; The circuit four is composed of a battery water pump (25) and a power battery (24) connected in sequence according to the coolant flow direction; The circuit five is composed of the cooling water pump (20), the cooling water channel of the cooler (7), the channel from port a to port b of the three-way valve two (22), the front radiator (16), and the electric drive assembly (14) in sequence according to the coolant flow direction; The circuit six is ​​composed of a hot water pump (12), a three-way valve (13) from port a to port c, and an air conditioning heating core (17) connected in sequence according to the coolant flow direction.

2. The heat management water system based on R290 refrigerant for new energy vehicles as described in claim 1, characterized in that: The compressor (1) is connected to a large-diameter electronic expansion valve (8) at the refrigerant output end, and the other end of the large-diameter electronic expansion valve (8) is connected between the refrigerant output end of the cooler (7) and the high-pressure side channel input end of the internal heat exchanger (3).

3. The heat management water system based on R290 refrigerant for new energy vehicles as described in claim 1, characterized in that: The refrigerant output end of the liquid storage tank (4) is equipped with a high-pressure temperature sensor (5).

4. The heat management water system based on R290 refrigerant for new energy vehicles as described in claim 1, characterized in that: The electronic expansion valve one (6) is connected in parallel with the electronic expansion valve two (9) at both ends. One end of the electronic expansion valve two (9) is connected to the refrigerant output end of the liquid storage tank (4), and the other end is connected to the refrigerant output end of the cooler (7).

5. A heat management water system based on R290 refrigerant for new energy vehicles as described in claim 1, characterized in that: A water temperature sensor (10) is provided between the liquid side input end of the water-cooled condenser (2) and the coolant input end of the hot water pump (12).

6. A heat management water system based on R290 refrigerant for new energy vehicles as described in claim 1, characterized in that: An electronic fan (15) is provided on one side of the front heat sink (16).

7. A heat management water system based on R290 refrigerant for new energy vehicles as described in claim 1, characterized in that: A blower (19) is provided on one side of the air conditioning cooling core (18).

8. A single-air conditioning refrigeration method for a heat management water system based on R290 refrigerant in new energy vehicles, as described in any one of claims 1 to 7, characterized in that: When the compressor (1) is started, the high-temperature and high-pressure superheated refrigerant passes through the water-cooled condenser (2). The water-cooled condenser (2) participates in heat exchange, and the refrigerant is condensed. The liquid-side coolant of the water-cooled condenser (2) is heated. The heat follows the coolant from the liquid side of the water-cooled condenser (2) through the water temperature sensor (10) and the hot water pump (12), through the three-way valve (13) from end a to end b, enters the front radiator (16), is dissipated by the electric fan (15), and then returns to the water-cooled condenser (2) through the electric drive assembly (14). The refrigerant enters the cooler (7) after being throttled by the electronic expansion valve (6). The refrigerant evaporates and absorbs heat on the refrigerant side. The coolant in the cooler (7) is cooled. The cooled coolant enters the three-way valve (22) from end a to end c through the water temperature sensor (10), and then enters the air conditioning core (18) from end a to end b through the three-way valve (23). The crew cabin is cooled by the blower (19). The coolant then returns to the cooler (7) through the cooling water pump (20).

9. A single-cell cooling method for a thermal management water system based on R290 refrigerant in new energy vehicles, as described in any one of claims 1 to 7, characterized in that: When the compressor (1) is started, the high-temperature and high-pressure superheated refrigerant passes through the water-cooled condenser (2). The water-cooled condenser (2) participates in heat exchange, and the refrigerant is condensed. The liquid-side coolant of the water-cooled condenser (2) is heated. The heat follows the coolant from the liquid side of the water-cooled condenser (2) through the water temperature sensor (10) and the hot water pump (12), and through the three-way valve (13) from end a to end b, enters the front radiator (16), is dissipated by the electric fan (15), and then returns to the water-cooled condenser (2) through the electric drive assembly (14), thus completing the process. The cooling water circuit is circulated; the refrigerant enters the cooler (7) after being throttled by the electronic expansion valve (6) and evaporates and absorbs heat on the refrigerant side. The coolant in the cooler (7) is cooled. The cooled coolant enters the three-way valve (22) from end a to end c through the water temperature sensor (10), and then enters the power battery (24) from end a to end c through the three-way valve (23) for heat exchange. At this time, the battery water pump (25) is also turned on. After cooling the battery, the coolant returns to the cooler (7) through the refrigeration water pump (20).

10. A method for heating an air-source heat pump based on a thermal management water system using R290 refrigerant in a new energy vehicle, as described in any one of claims 1 to 7, characterized in that: When the compressor (1) is started, the high-temperature and high-pressure superheated refrigerant passes through the water-cooled condenser (2). The water-cooled condenser (2) participates in heat exchange, the refrigerant is condensed, and the liquid side coolant of the water-cooled condenser (2) is heated. The heat follows the coolant from the liquid side of the water-cooled condenser (2) through the water temperature sensor (10) and the hot water pump (12), through the three-way valve (13) from end a to end c, and enters the air conditioning heating core (17). The crew cabin is heated by the blower (19). After the refrigerant is throttled by the electronic expansion valve (6), it enters the cooler (7) to evaporate and absorb heat. The coolant in the liquid side of the cooler (7) is cooled. The cooled coolant passes through the water temperature sensor (10) and enters the three-way valve (22) from end a to end b and enters the front radiator (16). It absorbs heat from the air through the electric fan (15) and then returns to the liquid side of the cooler (7) through the electric drive assembly (14) and the chilled water pump (20).

11. A water source heat pump heating method for a thermal management water system based on R290 refrigerant in new energy vehicles, as described in any one of claims 1 to 7, characterized in that: When the compressor (1) is started, the high-temperature and high-pressure superheated refrigerant passes through the water-cooled condenser (2). The water-cooled condenser (2) participates in heat exchange, and the refrigerant is condensed. The liquid-side coolant of the water-cooled condenser (2) is heated. The heat follows the coolant from the liquid side of the water-cooled condenser (2) through the water temperature sensor (10) and the hot water pump (12), and through the three-way valve (13) from end a to end c, and enters the air conditioning heating core (17). The heating of the passenger compartment is completed by the blower (19). The refrigerant passes through the electronic After the expansion valve (6) throttles, the coolant enters the cooler (7) and evaporates and absorbs heat on the liquid side. The coolant in the cooler (7) is cooled. The cooled coolant passes through the water temperature sensor (10) and enters the three-way valve (22) from end a to end c. Then it passes through the three-way valve (23) from end a to end c and enters the power battery (24) to absorb heat. At this time, the battery water pump (25) is not turned on. After the battery waste heat recovery is completed, the coolant returns to the cooler (7) through the cooling water pump (20).

12. A hot gas bypass heating method for a thermal management water system based on R290 refrigerant in new energy vehicles, as described in any one of claims 1 to 7, characterized in that: When the compressor (1) is started, the high-temperature and high-pressure superheated refrigerant passes through the water-cooled condenser (2). The water-cooled condenser (2) participates in heat exchange, the refrigerant is condensed, and the liquid side coolant of the water-cooled condenser (2) is heated. The heat follows the coolant from the liquid side of the water-cooled condenser (2) through the water temperature sensor (10) and the hot water pump (12), and through the three-way valve (13) from end a to end c, and enters the air conditioning heating core (17). The crew cabin is heated by the blower (19). Another part of the high-temperature and high-pressure refrigerant from the compressor (1) returns to the low-pressure side of the internal heat exchanger (3) through the large-diameter electronic expansion valve (8) to replenish gas and increase enthalpy, thereby increasing the low-pressure pressure of the system. The condensed refrigerant enters the cooler (7) after being throttled by the electronic expansion valve (6). At this time, the cooling water pump (20) and the battery water pump (25) do not work, and the cooler (7) does not participate in heat exchange.

13. The electric-driven natural heat dissipation method for a thermal management water system based on R290 refrigerant in a new energy vehicle, as described in any one of claims 1 to 7, is characterized in that: The compressor (1) does not need to be started. The high-temperature coolant from the electric drive assembly (14) enters the cooler (7) via the cooling water pump (20), flows through the water temperature sensor (10) and the three-way valve (22) from end a to end b and enters the front radiator (16). It completes natural heat dissipation by exchanging heat with the air through the electric fan (15). The cooled coolant then returns to the electric drive assembly (14).

14. A battery natural heat dissipation method based on a thermal management water system using R290 refrigerant in a new energy vehicle, as described in any one of claims 1 to 7, characterized in that: The compressor (1) does not need to be started. The battery water pump (25) is turned on. The high-temperature coolant from the power battery (24) enters the cooler (7) via the refrigeration water pump (20), and then passes through the water temperature sensor (10). It enters the three-way valve (22) and splits into two paths from end a to end b / c. One path passes through the three-way valve (23) and returns to the power battery (24) from end a to end c. The other part enters the front radiator (16) and completes natural heat dissipation by exchanging heat with the air through the electric fan (15). The cooled coolant passes through the electric drive assembly (14), merges with the water out of the power battery (24), and returns to the refrigeration water pump (20).

Images