Pure electric light truck heat pump system

Abstract

The utility model 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 improved, 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] This utility model relates to the field of vehicle thermal management technology, specifically to a heat pump system for a pure electric light truck. Background Technology

[0002] With the continued development of pure electric trucks, people are paying more attention to the overall driving range. Currently, limited by the development of battery technology and charging platforms, the high efficiency and energy saving of truck air conditioning systems have become one of the main means to improve driving range. Therefore, based on the single-cooling air conditioning system currently used in pure electric light trucks, the entire vehicle needs a more efficient and energy-saving heat pump system.

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

[0004] In existing technical solutions, the cab heating uses a separate PTC air heater. This heating mode increases energy consumption in winter, which seriously reduces the vehicle's driving range. Utility Model Content

[0005] The technical problem to be solved by this utility model is to improve heating efficiency and reduce power consumption. To solve the above problem, a pure electric light truck heat pump system is provided.

[0006] The objective of this utility model is achieved in the following manner:

[0007] 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.

[0008] The compressor 1 is connected to the external condenser 4, the external condenser 4 is connected to the internal evaporator 10, the internal evaporator 10 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1.

[0009] Alternatively, the compressor 1 can be connected to an external condenser 4, which in turn can be connected to a plate heat exchanger 11; the plate heat exchanger 11 can be connected to a gas-liquid separator 12, which in turn can be connected to the compressor 1.

[0010] Alternatively, the compressor 1 can be connected to an external condenser 4, the external condenser 4 can be connected to an internal evaporator 10 and a plate heat exchanger 11, the internal evaporator 10 and the plate heat exchanger 11 can be connected to a gas-liquid separator 12, and the gas-liquid separator 12 can be connected to the compressor 1.

[0011] Alternatively, the compressor 1 can be connected to the in-vehicle condenser 5, the in-vehicle condenser 5 can be connected to the plate heat exchanger 11, the plate heat exchanger 11 can be connected to the gas-liquid separator 12, and the gas-liquid separator 12 can be connected to the compressor 1.

[0012] The water-side system circuit includes a motor-driven water pump 13, a four-way water valve 14, a battery-powered water pump 15, a water PTC 16, a three-way water valve 17, a battery, a motor, and a plate heat exchanger 11.

[0013] 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.

[0014] Alternatively, the plate heat exchanger 11 can be connected to a four-way water valve 14, the four-way water valve 14 can be connected to a motor water pump 13, the motor water pump 13 can be connected to a motor, the motor can be connected to the four-way water valve 14, the four-way water valve 14 can be connected to a battery water pump 15, the battery water pump 15 can be connected to a water PTC 16, the water PTC 16 can be connected to a three-way water valve 17, and the three-way water valve 17 can be connected to the plate heat exchanger 11.

[0015] Alternatively, the plate heat exchanger 11 can be connected to a four-way water valve 14, the four-way water valve 14 can be connected to a battery water pump 15, the battery water pump 15 can be connected to a water PTC 16, the water PTC 16 can be connected to a three-way water valve 17, the three-way water valve 17 can be connected to a battery, and the battery can be connected to the plate heat exchanger 11.

[0016] Alternatively, the plate heat exchanger 11 can be connected to a four-way water valve 14, the four-way water valve 14 can be connected to a battery water pump 15, the battery water pump 15 can be connected to a water PTC 16, the water PTC 16 can be connected to a three-way water valve 17, and the three-way water valve 17 can be connected to the plate heat exchanger 11.

[0017] In the cab cooling mode, the compressor 1 is connected to the external condenser 4 through the first solenoid valve 2. The external condenser 4 is connected to the internal evaporator 10 through the first one-way valve 6 and the first electronic expansion valve 8. The internal evaporator 10 is connected to the gas-liquid separator 12. The gas-liquid separator 12 is connected to the compressor 1.

[0018] In battery cooling mode, the compressor 1 is connected to the external condenser 4 via the first solenoid valve 2, and the external 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, 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.

[0019] In the cab cooling + battery cooling mode: the compressor 1 is connected to the external condenser 4 via the first solenoid valve 2. The external condenser 4 is connected to the internal evaporator 10 via the first electronic expansion valve 8 and to the plate heat exchanger 11 via the second electronic expansion valve 9. The internal evaporator 10 and the plate heat exchanger 11 are connected to the gas-liquid separator 12, which is connected to the compressor 1. The plate heat exchanger 11 is connected to the four-way water valve 14, which is connected to the battery water pump 15. The battery water pump 15 is connected to the water PTC 16, which is connected to the water PTC 16. The water PTC 16 is connected to the three-way water valve 17, which is connected to the battery. The battery is connected to the plate heat exchanger 11.

[0020] In the cab heating mode + motor waste heat utilization mode: the compressor 1 is connected to the vehicle interior condenser 5 through the second electronic expansion valve 3; the vehicle interior 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; 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.

[0021] In the cab heating mode + battery heat storage utilization mode: the compressor 1 is connected to the vehicle interior condenser 5 through the second electronic expansion valve 3; the vehicle interior 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; 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.

[0022] In the cab heating mode + battery heating mode: the compressor 1 is connected to the vehicle interior condenser 5 via the second electronic expansion valve 3; the vehicle interior 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.

[0023] In the cab heating mode + water PTC heating mode: the compressor 1 is connected to the vehicle interior condenser 5 through the second electronic expansion valve 3; the vehicle interior 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; 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.

[0024] The beneficial effects of this utility model are as follows: This utility model eliminates the high-power PTC heating method of mainstream models and uses the waste heat of the motor and the heat storage of the battery to heat the cab, thereby improving heating efficiency, reducing power consumption, and increasing the vehicle's driving range. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the system working principle of this utility model.

[0026] Figure 2 This is the circulation flow diagram under the cab cooling mode.

[0027] Figure 3 This is the flow diagram for the battery cooling mode.

[0028] Figure 4 This is a flow diagram of the cab cooling + battery cooling mode circulation.

[0029] Figure 5 This is a flow diagram showing the cab heating mode and the waste heat utilization circulation of the motor.

[0030] Figure 6 It is a flow diagram of the cab heating mode + battery heat storage utilization circulation.

[0031] Figure 7 This is a flow chart showing the cycle of cab heating mode + battery heating mode.

[0032] Figure 8This is a flow diagram of the cab heating mode + water PTC heating circulation.

[0033] Figure 9 This is a schematic diagram of the thermal management system for pure electric light trucks in existing technology.

[0034] Among them, 1-compressor; 2-first solenoid valve; 3-second solenoid valve; 4-external condenser; 5-internal condenser; 6-first check valve; 7-second check valve; 8-first electronic expansion valve; 9-second electronic expansion valve; 10-internal 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 Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0036] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0037] 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.

[0038] The compressor 1 is connected to the external condenser 4, the external condenser 4 is connected to the internal evaporator 10, the internal evaporator 10 is connected to the gas-liquid separator 12, and the gas-liquid separator 12 is connected to the compressor 1.

[0039] 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.

[0040] The compressor 1 is connected to the external condenser 4, the external condenser 4 is connected to the internal evaporator 10 and the plate heat exchanger 11 respectively, the internal evaporator 10 and the plate heat exchanger 11 are connected to the gas-liquid separator 12 respectively, and the gas-liquid separator 12 is connected to the compressor 1.

[0041] 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.

[0042] The water-side system circuit includes a motor-driven water pump 13, a four-way water valve 14, a battery-powered water pump 15, a water PTC 16, a three-way water valve 17, a battery, a motor, and a plate heat exchanger 11.

[0043] 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.

[0044] 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 the 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.

[0045] 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.

[0046] 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.

[0047] like Figure 2 As shown, in the cab cooling mode, the compressor 1 is connected to the external condenser 4 through the first solenoid valve 2. The external condenser 4 is connected to the internal evaporator 10 through the first one-way valve 6 and the first electronic expansion valve 8. The internal evaporator 10 is connected to the gas-liquid separator 12. The gas-liquid separator 12 is connected to the compressor 1. Among them, the ⑪chiller (plate heat exchanger) achieves the purpose of heating by exchanging heat between the battery water circuit and the refrigerant circuit.

[0048] like Figure 3 As shown, in battery cooling mode, the compressor 1 is connected to the external condenser 4 via the first solenoid valve 2, and the external 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, 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.

[0049] like Figure 4 As shown, in the cab cooling + battery cooling mode: the compressor 1 is connected to the external condenser 4 via the first solenoid valve 2. The external condenser 4 is connected to the internal evaporator 10 via the first electronic expansion valve 8 and to the plate heat exchanger 11 via the second electronic expansion valve 9. The internal evaporator 10 and the plate heat exchanger 11 are connected to the gas-liquid separator 12, which is connected to the compressor 1. The plate heat exchanger 11 is connected to the four-way water valve 14, which is connected to the battery water pump 15. The battery water pump 15 is connected to the water PTC 16, which is connected to the water PTC 16. The water PTC 16 is connected to the three-way water valve 17, which is connected to the battery. The battery is connected to the plate heat exchanger 11.

[0050] 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 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, 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. The three-way water valve 17 is connected to the plate heat exchanger 11. The water system switches between the water circuits by adjusting the four-way valve, and heat exchange occurs between the water circuit of the chiiller (plate heat exchanger 11) and the refrigerant circuit, thereby achieving the heating purpose.

[0051] like Figure 6 As shown, in the cab heating mode + battery heat storage utilization mode: the compressor 1 is connected to the vehicle interior condenser 5 through the second electronic expansion valve 3; the vehicle interior 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; 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.

[0052] like Figure 7As shown, 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, 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, which is connected to the battery water pump 15. The battery water pump 15 is connected to the water PTC 16, which is connected to the water PTC 16. The water PTC 16 is connected to the three-way water valve 17, which is connected to the battery. The battery is connected to the plate heat exchanger 11. The water system switches between the water circuits by adjusting the three-way water valve 17, allowing heat exchange between the water circuit of the chiiller (plate heat exchanger 11) and the refrigerant circuit, thereby achieving the heating purpose.

[0053] like Figure 8 As shown, in the cab heating mode + water PTC heating mode: the compressor 1 is connected to the vehicle interior condenser 5 via the second electronic expansion valve 3. The vehicle interior 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, 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. The water system switches between the water circuits by adjusting the three-way valve, and heat exchange occurs between the water circuit of the chiiller (plate heat exchanger 11) and the refrigerant circuit, thereby achieving the heating purpose.

[0054] Furthermore, by opening the first solenoid valve 2 and closing the second solenoid valve 3, the refrigerant circulation for cooling the cab or cooling the battery can be achieved; by closing the first solenoid valve 2 and opening the second solenoid valve 3, the refrigerant circulation for heating the cab can be achieved.

[0055] Furthermore, by opening the first electronic expansion valve 8 (EXV1) and closing the second electronic expansion valve 9 (EXV2), the refrigerant circulation in the cab is achieved.

[0056] Alternatively, by closing the first electronic expansion valve 8 (EXV1) and opening the second electronic expansion valve 9 (EXV2), the refrigerant circulation for battery cooling or cab heating can be achieved.

[0057] Alternatively, by opening the first electronic expansion valve 8 (EXV1) and the second electronic expansion valve 9 (EXV2), the refrigerant circulation for heating in the cab and cooling in the battery can be achieved.

[0058] Furthermore, the pure electric light truck thermal management system also includes a battery water circulation system, which is composed of pipes 14, 15, 16, 17, 11 and corresponding cooling pipe systems. The chiller (plate heat exchanger) 11 consists of a refrigerant end and a water end. The refrigerant end acts as an evaporator, while the water end participates in the battery water circulation system. During operation, the relatively high-temperature antifreeze in the battery water circuit exchanges heat with the low-temperature refrigerant in the refrigerant end, thereby transferring heat from the battery water circuit system to the cab. The liquid cooling circulation is achieved by turning on the battery water pump 15, thus achieving battery water cooling circulation; furthermore, it realizes battery cooling and heating modes. Furthermore, it realizes three modes: cab heating mode + battery heat storage utilization, cab heating + battery heating mode, and cab heating mode + water PTC heating.

[0059] Furthermore, the pure electric light truck thermal management system also includes a motor water circulation system, which consists of pipes 13, 14, 15, 17, and 11, along with corresponding cooling pipe systems. The chiller (plate heat exchanger) 11 comprises a refrigerant end and a water end. The refrigerant end acts as an evaporator, while the water end participates in the motor water circulation system. During operation, the relatively high-temperature antifreeze in the motor water circuit exchanges heat with the low-temperature refrigerant in the refrigerant end, thereby transferring heat from the motor water circuit system to the cab. By activating the motor water pump 13 to perform the liquid cooling circulation, the waste heat of the motor is utilized. This further enables a cab heating mode.

[0060] The thermal management system designed in this utility model patent is a vehicle thermal management system in the form of a heat pump, which integrates the functions of motor heat dissipation, battery liquid cooling, and liquid heating at the vehicle end with the functions of driver's cab cooling and heating at the air conditioning end.

[0061] This utility model patent switches the water circuit by adjusting the actuators inside the four-way and three-way water valves, and makes reasonable use of the waste heat from the motor and the stored heat from the battery in the water system to heat the cab, achieving the following four working modes:

[0062] Cab heating mode + motor waste heat utilization:

[0063] When the four-way water valve 14 is connected at ports ③ and ④, the motor-driven water pump 13 operates; when ports ① and ② are connected, the battery-powered water pump 15 operates; when the three-way water valve 17 is connected at port AC, the water flow direction is as follows. Figure 5 The system uses water channels to exchange the waste heat generated by the vehicle's motor during winter operation with the plate heat exchanger (chiller).

[0064] Cab heating mode + battery heat storage utilization (also known as battery cooling):

[0065] When the ② and ③ ports of the four-way water valve 14 are connected, the battery-powered water pump 15 is running, the AC port of the three-way water valve 17 is connected, and the water flow direction is shown below. Figure 6 The water system facilitates heat exchange between the stored heat from the vehicle battery during winter charging and the chiller.

[0066] Cab heating mode + battery heating mode:

[0067] When ports ② and ③ of the four-way water valve 14 are connected, the battery-powered water pump 15 operates. When ports AB of the three-way water valve 17 are connected, the water PTC 16 heats the water circuit. The water flow direction is shown in [reference needed]. Figure 7 When the vehicle is first started in winter, the battery temperature and water temperature are too low. The battery is heated by water PTC16 and heat is exchanged with the chiller.

[0068] Cab heating mode + water PTC heating:

[0069] When the ② and ③ ports of the four-way water valve 14 are connected, the battery-powered water pump 15 operates. The AC port of the three-way water valve 17 is connected, and the PTC water heater 16 heats the water circuit. The water flow direction is shown below. Figure 8 When a vehicle is first started in winter, the water temperature is too low and there is no heat to transfer. The water circuit is heated by a PTC water heater, which exchanges heat with the chiller.

[0070] Compared with the current mainstream PTC heating mode, this utility model patent has a significantly improved energy efficiency ratio, greatly reducing the vehicle's power consumption in winter and increasing the vehicle's driving range.

[0071] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A pure electric light truck heat pump system, characterized in that: It 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 external condenser (4), the external condenser (4) is connected to the internal evaporator (10), the internal evaporator (10) is connected to the gas-liquid separator (12), and the gas-liquid separator (12) is connected to the compressor (1). Alternatively, the compressor (1) is connected to the external condenser (4), 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). Alternatively, the compressor (1) is connected to the external condenser (4), the external condenser (4) is connected to the internal evaporator (10) and the plate heat exchanger (11), the internal evaporator (10) and the plate heat exchanger (11) are connected to the gas-liquid separator (12), and the gas-liquid separator (12) is connected to the compressor (1). Alternatively, the compressor (1) is connected to the vehicle condenser (5), the 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 circuit includes a motor-driven water pump (13), a four-way water valve (14), a battery-driven 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). Alternatively, 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 the 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). Alternatively, 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). Alternatively, 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 external condenser (4) through the first solenoid valve (2), the external condenser (4) is connected to the internal evaporator (10) through the first check valve (6) and the first electronic expansion valve (8), the internal 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 battery cooling mode, the compressor (1) is connected to the external condenser (4) via the first solenoid valve (2), and the external condenser (4) is connected to the plate heat exchanger (11) via the first check 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), 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).

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 external condenser (4) through the first solenoid valve (2), the external condenser (4) is connected to the internal evaporator (10) through the first electronic expansion valve (8) and to the plate heat exchanger (11) through the second electronic expansion valve (9), the internal evaporator (10) and the plate heat exchanger (11) are 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).

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 vehicle condenser (5) through the second electronic expansion valve (3), the 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), 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).

6. The pure electric light truck heat pump system according to claim 1, characterized in that: In the cab heating mode + battery heat storage mode: the compressor (1) is connected to the vehicle condenser (5) through the second electronic expansion valve (3), the 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), 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 vehicle condenser (5) through the second electronic expansion valve (3), the 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), 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 vehicle condenser (5) through the second electronic expansion valve (3), the 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), 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).

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