Pure electric light truck heat pump system

Abstract

The invention discloses a heat pump system of a pure electric light truck. The heat pump system comprises a refrigerant system loop and a water side system loop, the refrigerant system loop comprises a compressor, a condenser outside a vehicle, a condenser inside the vehicle, an evaporator inside the vehicle, a gas-liquid separator and a plate heat exchanger; the compressor is connected with the external condenser, the external condenser is connected with the internal evaporator, the internal evaporator is connected with the gas-liquid separator, and the gas-liquid separator is connected with the compressor; the water side system loop comprises a motor water pump, a four-way water valve, a battery water pump, a water PTC (Positive Temperature Coefficient), a three-way water valve, a battery, a motor and a plate heat exchanger; the plate heat exchanger is connected with a four-way water valve, the four-way water valve is connected with a battery water pump, the battery water pump is connected with a water PTC, the water PTC is connected with a three-way water valve, the three-way water valve is connected with a battery, and the battery is connected with the plate heat exchanger. Compared with an air heating PTC heating mode, the energy efficiency ratio is remarkably increased, the power consumption of the whole vehicle in winter is greatly reduced, and the endurance mileage of the vehicle is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle thermal management, and in particular to a heat pump system for a pure electric light truck. Background Art

[0002] With the in-depth development of pure electric trucks, people are paying more attention to the vehicle's range. Currently, due to the limitations of battery technology and the development of charging platforms, the high efficiency and energy saving of truck air conditioning systems has become one of the main means to increase the range. Therefore, based on the single cooling air conditioning system currently used in pure electric light trucks, the whole vehicle needs a set of efficient and energy-saving heat pump systems.

[0003] The schematic diagram of the thermal management system of a pure electric light truck in the prior art is as follows: Fig. 9 As shown, one refrigerant flow path is the cab cooling system, and the other refrigerant flow path is the battery cooling system.

[0004] In the existing technical solution, the cab is heated using a separate air-heated PTC heating system. This heating mode increases energy consumption in winter and seriously reduces the vehicle's cruising range. Summary of the invention

[0005] The technical problem to be solved by the present invention is to improve the heating efficiency and reduce the power consumption. In order to solve the above problems, a pure electric light truck heat pump system is provided.

[0006] The object of the present invention is achieved in the following manner: A pure electric light truck heat pump system includes a refrigerant system circuit and a water side system circuit; the refrigerant system circuit includes a compressor 1, an external condenser 4, an internal condenser 5, an internal evaporator 10, a gas-liquid separator 12 and a plate heat exchanger 11; The compressor 1 is connected to the vehicle exterior condenser 4, the vehicle exterior condenser 4 is connected to the vehicle interior evaporator 10, the vehicle interior evaporator 10 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; Or the compressor 1 is connected to the off-vehicle condenser 4, the off-vehicle condenser 4 is connected to the plate heat exchanger 11; the plate heat exchanger 11 is connected to the gas-liquid separator 12, the gas-liquid separator 12 is connected to the compressor 1; Or the compressor 1 is connected to the outside condenser 4, the outside condenser 4 is respectively connected to the inside evaporator 10 and the plate heat exchanger 11, the inside evaporator 10 and the plate heat exchanger 11 are respectively connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; Or the compressor 1 is connected to the in-vehicle condenser 5, the in-vehicle condenser 5 is connected to the plate heat exchanger 11, the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; The water side system loop includes a motor water pump 13, a four-way water valve 14, a battery water pump 15, a water PTC 16, a three-way water valve 17, a battery, a motor and a plate heat exchanger 11; The plate heat exchanger 11 is connected to a four-way water valve 14, the four-way water valve 14 is connected to a battery water pump 15, the battery water pump 15 is connected to a water PTC 16, the water PTC 16 is connected to a three-way water valve 17, the three-way water valve 17 is connected to a battery, and the battery is connected to the plate heat exchanger 11; Or the plate heat exchanger 11 is connected to a four-way water valve 14, the four-way water valve 14 is connected to a motor water pump 13, the motor water pump 13 is connected to a motor, the motor is connected to a four-way water valve 14, the four-way water valve 14 is connected to a battery water pump 15, the battery water pump 15 is connected to a water PTC 16, the water PTC 16 is connected to a three-way water valve 17, and the three-way water valve 17 is connected to the plate heat exchanger 11; Or the plate heat exchanger 11 is connected to a four-way water valve 14, the four-way water valve 14 is connected to a battery water pump 15, the battery water pump 15 is connected to a water PTC 16, the water PTC 16 is connected to a three-way water valve 17, the three-way water valve 17 is connected to a battery, and the battery is connected to the plate heat exchanger 11; Or the plate heat exchanger 11 is connected to a four-way water valve 14 , the four-way water valve 14 is connected to a battery water pump 15 , the battery water pump 15 is connected to a water PTC 16 , the water PTC 16 is connected to a three-way water valve 17 , and the three-way water valve 17 is connected to the plate heat exchanger 11 .

[0007] In the cab cooling mode, the compressor 1 is connected to the outdoor condenser 4 through the first solenoid valve 2, the outdoor condenser 4 is connected to the indoor evaporator 10 through the first one-way valve 6 and the first electronic expansion valve 8, the indoor evaporator 10 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1.

[0008] In the battery cooling mode, the compressor 1 is connected to the external condenser 4 through the first solenoid valve 2, and the external condenser 4 is connected to the plate heat exchanger 11 through the first one-way valve 6 and the second electronic expansion valve 9; the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, and the four-way water valve 14 is connected to the battery water pump 15, and the battery water pump 15 is connected to the water PTC 16, and the water PTC 16 is connected to the three-way water valve 17, and the three-way water valve 17 is connected to the plate heat exchanger 11.

[0009] In the cab cooling + battery cooling mode: the compressor 1 is connected to the outdoor condenser 4 through the first solenoid valve 2, the outdoor condenser 4 is connected to the indoor evaporator 10 through the first electronic expansion valve 8, and is connected to the plate heat exchanger 11 through the second electronic expansion valve 9, the indoor evaporator 10 and the plate heat exchanger 11 are respectively connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, the four-way water valve 14 is connected to the battery water pump 15, the battery water pump 15 is connected to the water PTC 16, the water PTC 16 is connected to the three-way water valve 17, the three-way water valve 17 is connected to the battery, and the battery is connected to the plate heat exchanger 11.

[0010] In the cab heating mode + motor waste heat utilization mode: the compressor 1 is connected to the in-vehicle condenser 5 through the second electronic expansion valve 3, the in-vehicle condenser 5 is connected to the plate heat exchanger 11 through the second one-way valve 7 and the second electronic expansion valve 9, the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, the four-way water valve 14 is connected to the motor water pump 13, the motor water pump 13 is connected to the motor, the motor is connected to the four-way water valve 14, the four-way water valve 14 is connected to the battery water pump 15, the battery water pump 15 is connected to the water PTC 16, the water PTC 16 is connected to the three-way water valve 17, and the three-way water valve 17 is connected to the plate heat exchanger 11.

[0011] In the cab heating mode + battery heat storage utilization mode: the compressor 1 is connected to the in-vehicle condenser 5 through the second electronic expansion valve 3, the in-vehicle condenser 5 is connected to the plate heat exchanger 11 through the second one-way valve 7 and the second electronic expansion valve 9, the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, the four-way water valve 14 is connected to the battery water pump 15, the battery water pump 15 is connected to the water PTC 16, the water PTC 16 is connected to the three-way water valve 17, the three-way water valve 17 is connected to the battery, and the battery is connected to the plate heat exchanger 11.

[0012] In the cab heating mode + battery heating mode: the compressor 1 is connected to the in-vehicle condenser 5 through the second electronic expansion valve 3, the in-vehicle condenser 5 is connected to the plate heat exchanger 11 through the second one-way valve 7 and the second electronic expansion valve 9, the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, the four-way water valve 14 is connected to the battery water pump 15, the battery water pump 15 is connected to the water PTC 16, the water PTC 16 is connected to the three-way water valve 17, the three-way water valve 17 is connected to the battery, and the battery is connected to the plate heat exchanger 11.

[0013] In the cab heating mode + water PTC heating mode: the compressor 1 is connected to the in-vehicle condenser 5 through the second electronic expansion valve 3, the in-vehicle condenser 5 is connected to the plate heat exchanger 11 through the second one-way valve 7 and the second electronic expansion valve 9, the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, the four-way water valve 14 is connected to the battery water pump 15, the battery water pump 15 is connected to the water PTC 16, the water PTC 16 is connected to the three-way water valve 17, and the three-way water valve 17 is connected to the plate heat exchanger 11.

[0014] Beneficial effects of the present invention: The present invention eliminates the high-power air-heating PTC heating method of mainstream models, and utilizes the waste heat of the motor and the heat stored in the battery to heat the cab, thereby improving the heating efficiency, reducing power consumption, and increasing the vehicle's cruising range. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a system working principle diagram of the present invention.

[0016] Figure 2 This is the circulation flow diagram in the cab cooling mode.

[0017] Figure 3 This is the cycle flow diagram of the battery cooling mode.

[0018] Figure 4 This is the circulation flow diagram of the cab cooling + battery cooling mode.

[0019] Figure 5 This is the circulation flow diagram of the cab heating mode + motor waste heat utilization.

[0020] Figure 6 This is the circulation flow diagram of the cab heating mode + battery heat storage utilization.

[0021] Figure 7 This is the circulation flow diagram of the cab heating mode + battery heating mode.

[0022] Figure 8 This is the cab heating mode + water PTC heating circulation flow diagram.

[0023] Fig. 9 It is a schematic diagram of the thermal management system of a pure electric light truck in the prior art.

[0024] Among them, 1-compressor; 2-first solenoid valve; 3-second solenoid valve; 4-outside condenser; 5-inside condenser; 6-first one-way valve; 7-second one-way valve; 8-first electronic expansion valve; 9-second electronic expansion valve; 10-inside evaporator; 11-plate heat exchanger; 12-gas-liquid separator; 13-motor water pump; 14-four-way water valve; 15-battery water pump; 16-water PTC; 17-three-way water valve. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0027] A pure electric light truck heat pump system includes a refrigerant system circuit and a water side system circuit; the refrigerant system circuit includes a compressor 1, an external condenser 4, an internal condenser 5, an internal evaporator 10, a gas-liquid separator 12 and a plate heat exchanger 11; The compressor 1 is connected to the vehicle exterior condenser 4, the vehicle exterior condenser 4 is connected to the vehicle interior evaporator 10, the vehicle interior evaporator 10 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; The compressor 1 is connected to the external condenser 4, and the external condenser 4 is connected to the plate heat exchanger 11; the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; The compressor 1 is connected to the vehicle-outside condenser 4, the vehicle-outside condenser 4 is respectively connected to the vehicle-inside evaporator 10 and the plate heat exchanger 11, the vehicle-inside evaporator 10 and the plate heat exchanger 11 are respectively connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; The compressor 1 is connected to the in-vehicle condenser 5, the in-vehicle condenser 5 is connected to the plate heat exchanger 11, the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; The water side system loop includes a motor water pump 13, a four-way water valve 14, a battery water pump 15, a water PTC 16, a three-way water valve 17, a battery, a motor and a plate heat exchanger 11; The plate heat exchanger 11 is connected to a four-way water valve 14, the four-way water valve 14 is connected to a battery water pump 15, the battery water pump 15 is connected to a three-way water valve 17, the three-way water valve 17 is connected to a battery, and the battery is connected to the plate heat exchanger 11; The plate heat exchanger 11 is connected to a four-way water valve 14, the four-way water valve 14 is connected to a motor water pump 13, the motor water pump 13 is connected to a motor, the motor is connected to a four-way water valve 14, the four-way water valve 14 is connected to a battery water pump 15, the battery water pump 15 is connected to a three-way water valve 17, and the three-way water valve 17 is connected to the plate heat exchanger 11; The plate heat exchanger 11 is connected to a four-way water valve 14, the four-way water valve 14 is connected to a battery water pump 15, the battery water pump 15 is connected to a water PTC 16, the water PTC 16 is connected to a three-way water valve 17, the three-way water valve 17 is connected to a battery, and the battery is connected to the plate heat exchanger 11; The plate heat exchanger 11 is connected to a four-way water valve 14 , the four-way water valve 14 is connected to a battery water pump 15 , the battery water pump 15 is connected to a water PTC 16 , the water PTC 16 is connected to a three-way water valve 17 , and the three-way water valve 17 is connected to the plate heat exchanger 11 .

[0028] like Figure 2 As shown, in the cab cooling mode, the compressor 1 is connected to the outdoor condenser 4 through the first solenoid valve 2, the outdoor condenser 4 is connected to the indoor evaporator 10 through the first one-way valve 6 and the first electronic expansion valve 8, the indoor evaporator 10 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; wherein, the ⑪ chiller (plate heat exchanger) achieves the purpose of heating through heat exchange between the battery water circuit and the refrigerant circuit.

[0029] like Figure 3 As shown, in the battery cooling mode, the compressor 1 is connected to the external condenser 4 through the first solenoid valve 2, and the external condenser 4 is connected to the plate heat exchanger 11 through the first one-way valve 6 and the second electronic expansion valve 9; the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, and the four-way water valve 14 is connected to the battery water pump 15, and the battery water pump 15 is connected to the water PTC 16, and the water PTC 16 is connected to the three-way water valve 17, and the three-way water valve 17 is connected to the plate heat exchanger 11.

[0030] like Figure 4As shown, in the cab cooling + battery cooling mode: the compressor 1 is connected to the outdoor condenser 4 through the first solenoid valve 2, the outdoor condenser 4 is connected to the indoor evaporator 10 through the first electronic expansion valve 8, and is connected to the plate heat exchanger 11 through the second electronic expansion valve 9, the indoor evaporator 10 and the plate heat exchanger 11 are respectively connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, the four-way water valve 14 is connected to the battery water pump 15, the battery water pump 15 is connected to the water PTC 16, the water PTC 16 is connected to the three-way water valve 17, the three-way water valve 17 is connected to the battery, and the battery is connected to the plate heat exchanger 11.

[0031] like Figure 5 As shown, in the cab heating mode + motor waste heat utilization mode: the compressor 1 is connected to the in-vehicle condenser 5 through the second electronic expansion valve 3, the in-vehicle condenser 5 is connected to the plate heat exchanger 11 through the second one-way valve 7 and the second electronic expansion valve 9, the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, the four-way water valve 14 is connected to the motor water pump 13, the motor water pump 13 is connected to the motor, the motor is connected to the four-way water valve 14, the four-way water valve 14 is connected to the battery water pump 15, the battery water pump 15 is connected to the water PTC 16, the water PTC 16 is connected to the three-way water valve 17, and the three-way water valve 17 is connected to the plate heat exchanger 11. Among them, the water system switches the water by adjusting the four-way valve, and the water circuit of the chiller (plate heat exchanger 11) and the refrigerant circuit exchange heat, thereby achieving the purpose of heating.

[0032] like Figure 6 As shown, in the cab heating mode + battery heat storage utilization mode: the compressor 1 is connected to the in-vehicle condenser 5 through the second electronic expansion valve 3, the in-vehicle condenser 5 is connected to the plate heat exchanger 11 through the second one-way valve 7 and the second electronic expansion valve 9, the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, the four-way water valve 14 is connected to the battery water pump 15, the battery water pump 15 is connected to the water PTC 16, the water PTC 16 is connected to the three-way water valve 17, the three-way water valve 17 is connected to the battery, and the battery is connected to the plate heat exchanger 11.

[0033] like Figure 7As shown, in the cab heating mode + battery heating mode: the compressor 1 is connected to the in-vehicle condenser 5 through the second electronic expansion valve 3, the in-vehicle condenser 5 is connected to the plate heat exchanger 11 through the second one-way valve 7 and the second electronic expansion valve 9, the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, the four-way water valve 14 is connected to the battery water pump 15, the battery water pump 15 is connected to the water PTC 16, the water PTC 16 is connected to the three-way water valve 17, the three-way water valve 17 is connected to the battery, and the battery is connected to the plate heat exchanger 11. Among them, the water system switches the water by adjusting the three-way water valve 17, and the water circuit of the chiller (plate heat exchanger 11) and the refrigerant circuit exchange heat, thereby achieving the purpose of heating.

[0034] like Figure 8 As shown, in the cab heating mode + water PTC heating mode: the compressor 1 is connected to the in-vehicle condenser 5 through the second electronic expansion valve 3, the in-vehicle condenser 5 is connected to the plate heat exchanger 11 through the second one-way valve 7 and the second electronic expansion valve 9, the plate heat exchanger 11 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1; the plate heat exchanger 11 is connected to the four-way water valve 14, the four-way water valve 14 is connected to the battery water pump 15, the battery water pump 15 is connected to the water PTC 16, the water PTC 16 is connected to the three-way water valve 17, and the three-way water valve 17 is connected to the plate heat exchanger 11. Among them, the water system switches the water by adjusting the three-way valve, and the water circuit of the chiller (plate heat exchanger 11) and the refrigerant circuit exchange heat, thereby achieving the purpose of heating.

[0035] Furthermore, by opening the first solenoid valve 2 and closing the second solenoid valve 3, the cab cooling refrigerant circulation or the battery cooling refrigerant circulation is realized; by closing the first solenoid valve 2 and opening the second solenoid valve 3, the cab heating refrigerant circulation is realized.

[0036] Furthermore, by opening the first electronic expansion valve 8 (EXV1) and closing the second electronic expansion valve 9 (EXV2), the refrigerant circulation of the cab is realized.

[0037] Alternatively, the battery cooling refrigerant circulation or the cab heating refrigerant circulation is realized by closing the first electronic expansion valve 8 (EXV1) and opening the second electronic expansion valve 9 (EXV2); Alternatively, by opening the first electronic expansion valve 8 (EXV1) and the second electronic expansion valve 9 (EXV2), the cab heating refrigerant circulation and the battery cooling refrigerant circulation are realized.

[0038] Furthermore, the pure electric light truck thermal management system also includes a battery water circulation system, and the battery and motor water circulation system is composed of 14, 15, 16, 17, 11 and the corresponding cooling pipe system. The chiller (plate heat exchanger) 11 is composed of a refrigerant end and a water circuit end. The refrigerant end acts as an evaporator, and the water circuit end participates in the battery water circuit circulation system. During operation, the relatively high temperature antifreeze in the battery water circuit exchanges heat with the low temperature refrigerant at the refrigerant end, thereby achieving the purpose of transporting the heat in the battery water circuit system to the cab. By turning on the battery water pump 15 to perform the liquid cooling cycle, the purpose of the battery water cooling cycle is achieved; further, the battery cooling and heating modes are realized. Further, three modes are realized: cab heating mode + battery heat storage utilization, cab heating + battery heating mode, and cab heating mode + water PTC heating.

[0039] Furthermore, the thermal management system of the pure electric light truck also includes a motor water circuit circulation system, and the motor water circuit circulation system is composed of 13, 14, 15, 17, 11 and the corresponding cooling pipe system. The chiller (plate heat exchanger) 11 is composed of a refrigerant end and a water circuit end. The refrigerant end acts as an evaporator, and the water circuit end participates in the motor water circuit circulation system. During operation, the relatively high-temperature antifreeze in the motor water circuit exchanges heat with the low-temperature refrigerant at the refrigerant end, thereby achieving the purpose of transferring the heat in the motor water circuit system to the cab. By turning on the motor water pump 13 to perform the liquid cooling cycle, the purpose of utilizing the waste heat of the motor is achieved. Furthermore, the cab heating mode is realized.

[0040] The thermal management system designed by the patent of this invention is a vehicle thermal management system in the form of a heat pump, which integrates the motor heat dissipation, battery liquid cooling and liquid heating functions of the vehicle end and the cab cooling and heating functions of the air-conditioning end; The patent of this invention switches the water circuit by adjusting the internal actuator of the four-way water valve and the three-way water valve, and reasonably utilizes the motor waste heat and battery heat storage in the water circuit system to heat the cab, and can realize the following four working modes: Cab heating mode + motor waste heat utilization: ③④ of the four-way water valve 14 are connected, the motor water pump 13 is running, ①② are connected, the battery water pump 15 is running, the AC port of the three-way water valve 17 is connected, and the water flow direction is shown in Figure 5 Through the operation of the water channel, the waste heat generated by the operation of the vehicle motor in winter is exchanged with the plate heat exchanger chiller.

[0041] Cab heating mode + battery heat storage utilization (also known as battery cooling): The ②③ of the four-way water valve 14 is connected, the battery water pump 15 is running, the AC port of the three-way water valve 17 is connected, and the water flow direction is shown in FIG. Figure 6Through the operation of the water circuit, the heat stored in the vehicle battery during charging in winter is exchanged with the chiller.

[0042] Cab heating mode + battery heating mode: The ②③ of the four-way water valve 14 is connected, the battery water pump 15 is running, the AB port of the three-way water valve 17 is connected, the water PTC 16 heats the water circuit, and the water circuit flow direction is shown in FIG. Figure 7 When the vehicle is just started in winter, the battery temperature and water circuit temperature are too low, and the battery is heated by the water PTC16 and heat is exchanged with the chiller.

[0043] Cab heating mode + water PTC heating: ②③ of the four-way water valve 14 are connected, the battery water pump 15 is running, the AC port of the three-way water valve 17 is connected, the water PTC 16 heats the water channel, and the water channel flow direction is shown in FIG. Figure 8 When the vehicle is just started in winter, the water circuit temperature is too low and there is no heat to be transported. The water PTC is used to heat the water circuit and exchange heat with the chiller.

[0044] Compared with the current mainstream air-heating PTC heating mode, the patent of this invention significantly improves the energy efficiency, greatly reduces the power consumption of the whole vehicle in winter, and improves the vehicle's cruising range.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, which should also be regarded as the scope of protection of the present invention.

Claims

1. A pure electric light truck heat pump system, characterized in that: It comprises a refrigerant system circuit and a water side system circuit; the refrigerant system circuit comprises a compressor (1), an external condenser (4), an internal condenser (5), an internal evaporator (10), a gas-liquid separator (12) and a plate heat exchanger (11); The compressor (1) is connected to an external condenser (4), the external condenser (4) is connected to an internal evaporator (10), the internal evaporator (10) is connected to a gas-liquid separator (12), and the gas-liquid separator (12) is connected to the compressor (1); Or the compressor (1) is connected to an off-vehicle condenser (4), the off-vehicle condenser (4) is connected to the plate heat exchanger (11); the plate heat exchanger (11) is connected to a gas-liquid separator (12), and the gas-liquid separator (12) is connected to the compressor (1); or the compressor (1) is connected to an off-vehicle condenser (4), the off-vehicle condenser (4) is respectively connected to an on-vehicle evaporator (10) and a plate heat exchanger (11), the on-vehicle evaporator (10) and the plate heat exchanger (11) are respectively connected to a gas-liquid separator (12), and the gas-liquid separator (12) is connected to the compressor (1); Or the compressor (1) is connected to an in-vehicle condenser (5), the in-vehicle condenser (5) is connected to a plate heat exchanger (11), the plate heat exchanger (11) is connected to a gas-liquid separator (12), and the gas-liquid separator (12) is connected to the compressor (1); The water-side system loop comprises a motor water pump (13), a four-way water valve (14), a battery water pump (15), a water PTC (16), a three-way water valve (17), a battery, a motor and a plate heat exchanger (11); The plate heat exchanger (11) is connected to a four-way water valve (14), the four-way water valve (14) is connected to a battery water pump (15), the battery water pump (15) is connected to a water PTC (16), the water PTC (16) is connected to a three-way water valve (17), the three-way water valve (17) is connected to a battery, and the battery is connected to the plate heat exchanger (11); Or the plate heat exchanger (11) is connected to a four-way water valve (14), the four-way water valve (14) is connected to a motor water pump (13), the motor water pump (13) is connected to a motor, the motor is connected to a four-way water valve (14), the four-way water valve (14) is connected to a battery water pump (15), the battery water pump (15) is connected to a water PTC (16), the water PTC (16) is connected to a three-way water valve (17), and the three-way water valve (17) is connected to the plate heat exchanger (11); Or the plate heat exchanger (11) is connected to a four-way water valve (14), the four-way water valve (14) is connected to a battery water pump (15), the battery water pump (15) is connected to a water PTC (16), the water PTC (16) is connected to a three-way water valve (17), the three-way water valve (17) is connected to a battery, and the battery is connected to the plate heat exchanger (11); Or the plate heat exchanger (11) is connected to a four-way water valve (14), the four-way water valve (14) is connected to a battery water pump (15), the battery water pump (15) is connected to a water PTC (16), the water PTC (16) is connected to a three-way water valve (17), and the three-way water valve (17) is connected to the plate heat exchanger (11).

2. The pure electric light truck heat pump system according to claim 1, characterized in that: In the cab cooling mode, the compressor (1) is connected to the outside condenser (4) via the first solenoid valve (2), the outside condenser (4) is connected to the inside evaporator (10) via the first check valve (6) and the first electronic expansion valve (8), the inside evaporator (10) is connected to the gas-liquid separator (12), and the gas-liquid separator (12) is connected to the compressor (1).

3. The pure electric light truck heat pump system according to claim 1, characterized in that: In the battery cooling mode, the compressor (1) is connected to the off-vehicle condenser (4) via the first solenoid valve (2); the off-vehicle condenser (4) is connected to the plate heat exchanger (11) via the first one-way valve (6) and the second electronic expansion valve (9); the plate heat exchanger (11) is connected to the gas-liquid separator (12); the gas-liquid separator (12) is connected to the compressor (1); the plate heat exchanger (11) is connected to the four-way water valve (14); the four-way water valve (14) is connected to the battery water pump (15); the battery water pump (15) is connected to the water PTC (16); the water PTC (16) is connected to the three-way water valve (17); the three-way water valve (17) is connected to the plate heat exchanger (11).

4. The pure electric light truck heat pump system according to claim 1, characterized in that: In the cab cooling + battery cooling mode: the compressor (1) is connected to the outside condenser (4) via the first solenoid valve (2); the outside condenser (4) is connected to the inside evaporator (10) via the first electronic expansion valve (8) and to the plate heat exchanger (11) via the second electronic expansion valve (9); the inside evaporator (10) and the plate heat exchanger (11) are connected to the gas-liquid separator (12) respectively; the gas-liquid separator (12) is connected to the compressor (1); the plate heat exchanger (11) is connected to the four-way water valve (14); the four-way water valve (14) is connected to the battery water pump (15); the battery water pump (15) is connected to the water PTC (16); the water PTC (16) is connected to the three-way water valve (17); the three-way water valve (17) is connected to the battery; and the battery is connected to the plate heat exchanger (11).

5. The pure electric light truck heat pump system according to claim 1, characterized in that: In the cab heating mode + motor waste heat utilization mode: the compressor (1) is connected to the in-vehicle condenser (5) via the second electronic expansion valve (3); the in-vehicle condenser (5) is connected to the plate heat exchanger (11) via the second one-way valve (7) and the second electronic expansion valve (9); the plate heat exchanger (11) is connected to the gas-liquid separator (12); the gas-liquid separator (12) is connected to the compressor (1); the plate heat exchanger (11) is connected to the four-way water valve (14); the four-way water valve (14) is connected to the motor water pump (13); the motor water pump (13) is connected to the motor; the motor is connected to the four-way water valve (14); the four-way water valve (14) is connected to the battery water pump (15); the battery water pump (15) is connected to the water PTC (16); the water PTC (16) is connected to the three-way water valve (17); the three-way water valve (17) is connected to the plate heat exchanger (11).

6. The pure electric light truck heat pump system according to claim 1, characterized in that: In the cab heating mode + battery heat storage utilization mode: the compressor (1) is connected to the in-vehicle condenser (5) via the second electronic expansion valve (3); the in-vehicle condenser (5) is connected to the plate heat exchanger (11) via the second one-way valve (7) and the second electronic expansion valve (9); the plate heat exchanger (11) is connected to the gas-liquid separator (12); the gas-liquid separator (12) is connected to the compressor (1); the plate heat exchanger (11) is connected to the four-way water valve (14); the four-way water valve (14) is connected to the battery water pump (15); the battery water pump (15) is connected to the water PTC (16); the water PTC (16) is connected to the three-way water valve (17); the three-way water valve (17) is connected to the battery; and the battery is connected to the plate heat exchanger (11).

7. The pure electric light truck heat pump system according to claim 1, characterized in that: In the cab heating mode + battery heating mode: the compressor (1) is connected to the in-vehicle condenser (5) via the second electronic expansion valve (3); the in-vehicle condenser (5) is connected to the plate heat exchanger (11) via the second one-way valve (7) and the second electronic expansion valve (9); the plate heat exchanger (11) is connected to the gas-liquid separator (12); the gas-liquid separator (12) is connected to the compressor (1); the plate heat exchanger (11) is connected to the four-way water valve (14); the four-way water valve (14) is connected to the battery water pump (15); the battery water pump (15) is connected to the water PTC (16); the water PTC (16) is connected to the three-way water valve (17); the three-way water valve (17) is connected to the battery; and the battery is connected to the plate heat exchanger (11).

8. The pure electric light truck heat pump system according to claim 1, characterized in that: In the cab heating mode + water PTC heating mode: the compressor (1) is connected to the in-vehicle condenser (5) via the second electronic expansion valve (3); the in-vehicle condenser (5) is connected to the plate heat exchanger (11) via the second one-way valve (7) and the second electronic expansion valve (9); the plate heat exchanger (11) is connected to the gas-liquid separator (12); the gas-liquid separator (12) is connected to the compressor (1); the plate heat exchanger (11) is connected to the four-way water valve (14); the four-way water valve (14) is connected to the battery water pump (15); the battery water pump (15) is connected to the water PTC (16); the water PTC (16) is connected to the three-way water valve (17); the three-way water valve (17) is connected to the plate heat exchanger (11).

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