Thermal management system for electric vehicle

Abstract

The present invention relates to an electric vehicle thermal management system, and belongs to the technical field of automobile design and manufacturing. The electric vehicle thermal management system of the present invention includes a control valve, a radiator, a condenser, a sub-water tank, a compressor, an evaporator, a flow proportional valve, a first expansion valve, a second expansion valve, a first water pump, a second water pump, a third water pump, a battery, 3IN1, a microcontroller, an oil cooler, a motor, a water cooler and a heater core; the control valve includes 5 control ports and the 5 control ports are respectively defined as the first port, the second port, the third port, the fourth port and the fifth port, the first port, the second port and the fourth port are liquid inlets, and the third port and the fifth port are liquid outlets. The electric vehicle thermal management system of the present invention controls three sets of water circuits through a control valve to realize circuit conditions such as series connection and parallel connection, and uses the waste heat generated by the electric drive system to heat the battery and the heater system, thereby reducing power consumption and improving the vehicle's driving range.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile design and manufacture, and more particularly to a thermal management system for an electric vehicle. Background Art

[0002] In the prior art, Figure 1 As shown in the figure, the electric drive thermal management system 1, the battery thermal management system 2, and the air conditioning thermal management system 3 are independent of each other because of their different temperature requirements. The heat generated by the electric drive system of existing models is not effectively utilized. The battery and the heater can only be heated by their own PTC, which has a slow heating speed, large heat loss, consumes electric energy of the electric vehicle, and shortens the vehicle's cruising range. In addition, the electric drive system cooling circuit, battery circuit and heater circuit require three auxiliary water tanks to replenish water, which increases the weight of the vehicle. Summary of the invention

[0003] In order to solve the above technical problems existing in the prior art, an object of the present invention is to provide an electric vehicle thermal management system.

[0004] The electric vehicle thermal management system of the present invention comprises a control valve, a radiator, a condenser, a sub-water tank, a compressor, an evaporator, a gas-liquid separator, a flow proportional valve, a first expansion valve, a second expansion valve, a first water pump, a second water pump, a third water pump, a battery, a high-pressure three-in-one (3IN1), a microcontroller, an oil cooler, a motor, a water cooler, a blower and a heater core; the control valve comprises at least five control ports and the five control ports are respectively defined as a first port, a second port, a third port, a fourth port and a fifth port, the first port, the second port and the fourth port are liquid inlets, and the third port and the fifth port are liquid outlets; the compressor, the condenser, the gas-liquid separator, the first expansion valve, the second expansion valve and the evaporator are connected in sequence, the first expansion valve is connected to the water cooler, and the blower and the heater core are arranged adjacent to the evaporator; the first liquid outlet of the flow proportional valve is connected to the first liquid outlet of the flow proportional valve through a pipeline The liquid inlet of the radiator is connected to the first port of the control valve, the second liquid outlet of the flow control valve is connected to the liquid inlet of the heater core through a pipeline, the liquid outlet of the heater core is connected to the second liquid inlet of the high-pressure three-in-one, the liquid outlet of the radiator is connected to the second port of the control valve, the third port of the control valve is connected to the first liquid inlet of the high-pressure three-in-one through a pipeline, the liquid outlet of the high-pressure three-in-one is connected to the liquid inlet of the microcontroller, the liquid outlet of the microcontroller is connected to the liquid inlet of the oil cooler, the liquid outlet of the oil cooler is connected to the liquid inlet of the flow proportional valve, and a circulating water circuit is arranged between the oil cooler and the motor; the fifth port of the control valve is connected to the liquid inlet of the water cooler through a pipeline, the liquid outlet of the water cooler is connected to the liquid inlet of the battery through a pipeline, and the liquid outlet of the battery is connected to the fourth port of the solenoid valve.

[0005] Wherein, the control valve is an electromagnetic control valve, and the auxiliary water tank is used to supply water to the radiator and the first port of the control valve.

[0006] Wherein, it also includes a first water pump, which is arranged between the third port of the control valve and the first liquid inlet of the high-pressure three-in-one.

[0007] Wherein, it also includes a second water pump, and the second water pump is arranged on the pipeline between the fifth port and the water cooler.

[0008] Wherein, it also includes a third water pump, which is arranged on the pipeline between the liquid outlet of the heater core and the second liquid inlet of the high-pressure three-in-one heater.

[0009] Among them, when there is a heating request during the battery charging process, the first port of the control valve is controlled to be connected with the fifth port, the fourth port is connected to the third port, the second liquid outlet of the flow proportional valve is closed, and the battery is heated by the heat generated by the motor; the circulating water path is: the first water pump → high-pressure three-in-one → microcontroller → oil cooler → flow proportional valve → control valve → second water pump → water cooler → battery → first water pump.

[0010] Among them, when there is a cooling request during the battery charging process and the ambient temperature is not greater than 33°C, the first port of the control valve is disconnected, the second port is connected to the fifth port, the fourth port is connected to the third port, the second liquid outlet of the flow proportional valve is closed, the radiator is used to cool the battery, the water cooler does not work, and the circulating water path is: first water pump → high pressure three-in-one → microcontroller → oil cooler → flow proportional valve → control valve → second water pump → water cooler → battery → first water pump; when there is a cooling request during the battery charging process and the ambient temperature is greater than 33°C, the first port, the second port and the third port of the control solenoid valve are disconnected, the fourth port is connected to the fifth port, the water cooler is used to cool the battery, and the circulating water path is: second water pump → water cooler → battery → second water pump.

[0011] Among them, when there is a heating request and no warm air request during the battery discharge process, the second port of the control valve is disconnected, the first port is connected to the fifth port, the fourth port is connected to the third port, the second liquid outlet of the flow proportional valve is closed, and the battery is heated by waste heat. The circulating water path is: the first water pump → 3IN1 → microcontroller → oil cooler → flow proportional valve → control valve → second water pump → water cooler → battery → first water pump; when there is a heating request and a warm air request during the battery discharge process, the second port of the control valve is disconnected, the first port is connected to the fifth port, the fourth port is connected to the third port, the first liquid outlet and the second liquid outlet of the flow proportional valve are both opened, the flow proportional valve distributes the flow according to the battery and warm air requirements, and the battery and warm air are heated by waste heat. The circulating water path is:

[0012]

[0013] Among them, when the battery discharge is in a thermal equilibrium state and the electric drive system has no cooling request, the first port, the second port and the third port of the control valve are disconnected, the fourth port and the fifth port are connected, the first liquid outlet of the flow proportional valve is closed, 3IN1→microcontroller→oil cooler→flow proportional valve→heater core→third water pump→high pressure three-in-one constitutes an electric drive circulating water circuit, and the second water pump→water cooler→battery→second water pump constitutes a battery circulating water circuit; when the battery discharge is in a thermal equilibrium state and the electric drive system has a cooling request, the first port of the control valve is disconnected, the fourth port is connected to the fifth port, the second port and the third port are connected, the second liquid outlet of the flow proportional valve is closed, and the radiator is used for cooling, the first water pump→3IN1→microcontroller→oil cooler→flow proportional valve→radiator→first water pump constitutes an electric drive circulating water circuit, and the second water pump→water cooler→battery→second water pump constitutes a battery circulating water circuit.

[0014] Among them, when there is a cooling request during the battery discharge process and the radiator water outlet temperature is not greater than 33°C, the first port of the control valve is controlled to be disconnected, the second port is connected to the fifth port, the third port is connected to the fourth port, the second liquid outlet of the flow proportional valve is closed, the electric drive system and the battery system are connected in series, and the radiator is used to cool the battery. The circulating water circuit is the first water pump → 3IN1 → MCU → oil cooler → flow proportional valve → radiator → control valve → second water pump → water cooler → battery → first water pump; when there is a cooling request during the battery discharge process, and the electric drive system has a cooling request, and there is no air conditioning request, the first port of the control valve is controlled to be disconnected, the fourth port is connected to the fifth port, the second port is connected to the third port, the second liquid outlet of the flow proportional valve is closed, the battery is cooled by the water cooler, and the electric drive system Cooled by the radiator, the first water pump → 3IN1 → microcontroller → oil cooler → flow proportional valve → radiator → first water pump constitutes an electric drive circulating water circuit, and the second water pump → water cooler → battery → second water pump constitutes a battery circulating water circuit; when there is a cooling request during the discharge of the battery, and the electric drive system has a cooling request, and there is an air conditioning request, the first port of the control valve is disconnected, the fourth port is connected to the fifth port, the second port is connected to the third port, the second liquid outlet of the flow proportional valve is closed, the battery is cooled by the water cooler, the electric drive system is cooled by the radiator, and the air conditioner is cooled by the condenser refrigerant, the first water pump → high pressure three-in-one → microcontroller → oil cooler → flow proportional valve → radiator → control valve → first water pump constitutes an electric drive circulating water circuit, and the second water pump → water cooler → battery → second water pump constitutes a battery circulating water circuit.

[0015] Compared with the prior art, the electric vehicle thermal management system of the present invention has the following beneficial effects:

[0016] The electric vehicle thermal management system of the present invention rationally designs the water circuit, and only controls three sets of water circuits through one control valve to realize circuit operating conditions such as series connection and parallel connection. The heat generated by the motor replaces the PTC to heat the battery and the heater, and the PTC is eliminated in the system, which can realize 10 different control modes; the waste heat generated by the electric drive system is used to heat the battery and the heater system, which reduces power consumption and improves the vehicle's cruising range; and the use of an auxiliary water tank saves costs and reduces weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a structural block diagram of a thermal management system for an electric vehicle in the prior art.

[0018] Figure 2 It is a structural block diagram of the electric vehicle thermal management system of the present invention.

[0019] Figure 3 It is a schematic diagram of the battery charging and heating circuit in the system of the present invention.

[0020] Figure 4 A schematic diagram of a circuit for charging and cooling batteries in the system of the present invention.

[0021] Figure 5 Another schematic diagram of a circuit for battery charging and cooling in the system of the present invention.

[0022] Figure 6 A schematic diagram of a circuit for discharging and heating batteries in the system of the present invention.

[0023] Figure 7 Another circuit diagram of battery discharge heating in the system of the present invention.

[0024] Figure 8 A circuit diagram of a battery discharge thermal equilibrium state in the system of the present invention.

[0025] Fig. 9 Another circuit diagram of the thermal balance state of battery discharge in the system of the present invention.

[0026] Fig.10 A schematic diagram of a circuit for discharging and cooling batteries in the system of the present invention.

[0027] Fig.11 Another circuit diagram of battery discharge cooling in the system of the present invention.

[0028] Fig.12 Schematic diagram of a third circuit for battery discharge cooling in the system of the present invention. DETAILED DESCRIPTION

[0029] The electric vehicle thermal management system of the present invention will be further described below in conjunction with specific embodiments to help those skilled in the art to have a more complete, accurate and in-depth understanding of the technical solution of the present invention.

[0030] Example 1

[0031] like Figure 2As shown, the electric vehicle thermal management system of this embodiment includes a control valve, a radiator, a condenser, a sub-tank, a compressor, an evaporator, a blower, a heater core, a gas-liquid separator, a flow proportional valve, a first expansion valve, a second expansion valve, a first water pump, a second water pump, a third water pump, a battery, a high-pressure three-in-one (3IN1), a microcontroller (MCU), an oil cooler, a motor and a water cooler (chiller). The control valve includes at least 5 control ports and the 5 control ports are respectively defined as the first port, the second port, the third port, the fourth port and the fifth port, the first port, the second port and the fourth port are liquid inlets, the third port and the fifth port are liquid outlets, and the control valve is preferably an electromagnetic control valve. The compressor, the condenser, the gas-liquid separator, the first expansion valve, the second expansion valve and the evaporator are connected in sequence, the first expansion valve is connected to the water cooler, and the blower and the heater core are arranged adjacent to the evaporator. The first liquid outlet of the flow proportional valve is connected to the liquid inlet of the radiator and the first port of the control valve through a pipeline, the second liquid outlet of the flow control valve is connected to the liquid inlet of the heater core through a pipeline, and the liquid outlet of the heater core is connected to the second liquid inlet of 3IN1, and the third water pump is arranged on the pipeline between the liquid outlet of the heater core and the second liquid inlet of 3IN1. The liquid outlet of the radiator is connected to the second port of the control valve, the third port of the control valve is connected to the first liquid inlet of 3IN1 through a pipeline, and the first water pump is arranged between the third port of the control valve and the first liquid inlet of 3IN1. The liquid outlet of 3IN1 is connected to the liquid inlet of the microcontroller (MCU), the liquid outlet of the microcontroller (MCU) is connected to the liquid inlet of the oil cooler, the liquid outlet of the oil cooler is connected to the liquid inlet of the flow proportional valve, and a circulating water circuit is arranged between the oil cooler and the motor. The fifth port of the control valve is connected to the liquid inlet of the water cooler through a pipeline, and the second water pump is arranged on the pipeline between the fifth port and the water cooler. The liquid outlet of the water cooler is connected to the liquid inlet of the battery through a pipeline, and the liquid outlet of the battery is connected to the fourth port of the solenoid valve. The auxiliary water tank is used to supply water to the radiator and the first port of the control valve.

[0032] In this embodiment, high voltage three-in-one refers to a device that integrates a DC-DC direct current conversion device, an OBC vehicle charger and a PDU high voltage distribution box, which is responsible for coordinating the transformation operations of the high voltage electricity of the entire vehicle. For the sake of simplicity in the following content and the accompanying drawings, 3IN1 will be used to represent it.

[0033] like Figure 3As shown, the control circuit is to heat the battery when the battery is charged. The control strategy is to heat the battery when the temperature is low. The second port of the control solenoid valve is disconnected, the first port is connected to the fifth port, the fourth port is connected to the third port, the flow proportional valve cuts off the warm air circuit (the second liquid outlet of the flow proportional valve is closed), and the motor generates heat to heat the battery. The letter A in the figure shows the circulating water circuit, and the path of the circulating water circuit is: water pump 1→3IN1→MCU→oil cooler→flow proportional valve→control valve→water pump 2→water cooler→battery→water pump 1.

[0034] like Figure 4 As shown in the figure, when the ambient temperature is not greater than 33°C, the control strategy for charging and cooling the battery is implemented. The first port of the solenoid control valve is disconnected, the second port is connected to the fifth port, the fourth port is connected to the third port, the proportional valve cuts off the warm air circuit, the radiator cools the battery, and the chiller does not work. The letter B in the figure shows the circulating water circuit, and the circulating water circuit path is: water pump 1→3IN1→MCU→oil cooler→flow proportional valve→radiator→control valve→water pump 2→chiller→battery→water pump 1.

[0035] like Figure 5 As shown in the figure, when the ambient temperature is greater than 33°C, the control strategy for charging and cooling the battery is used. The control strategy is that the first port, the second port and the third port of the electromagnetic control valve are disconnected, the fourth port is connected to the fifth port, and the chiller cools the battery. The letter C in the figure shows the circulating water circuit, and the circulating water circuit path is: water pump 2→chiller→battery→water pump 2.

[0036] like Figure 6 As shown, the battery is heated when it is discharged, and the system has no heating request. Control strategy: Port 2 is disconnected, ports 1 and 5, 4 and 3 are connected, the proportional valve cuts off the heating circuit, and the waste heat generated by the electric drive system heats the battery. The letter D in the figure shows the circulating water circuit, and the circulating water circuit path is: water pump 1→3IN1→MCU→oil cooler→flow proportional valve→control valve→water pump 2→chiller→battery→water pump 1.

[0037] like Figure 7 As shown, the battery is heated when it is discharged, and the system has a warm air request. Control strategy: Control strategy: Port 2 is disconnected, ports 1 and 5, 4 and 3 are connected, the battery circuit and the warm air circuit are connected in parallel, and the proportional valve distributes the flow according to the battery and warm air requirements. The waste heat generated by the electric drive system heats the battery and warm air. The letter E in the figure shows the circulating water circuit, and the circulating water circuit path is:

[0038]

[0039] like Figure 8As shown, the battery discharge heat is balanced, and the electric drive system has no cooling request. Control strategy: Ports 1, 2, and 3 are disconnected, ports 4 and 5 are connected, the proportional valve cuts off the battery circuit, and the electric drive system water circuit is disconnected from the battery water circuit. The electric drive circulation water circuit path is: 3IN1→MCU→oil cooler→flow proportional valve→heater core→water pump 3→3IN1. The letter F in the figure shows the circulation water circuit, and the battery circulation water circuit path is: water pump 2→chiller→battery→control valve→water pump 2.

[0040] like Fig. 9 As shown, the battery discharge heat is balanced, and the electric drive system has a cooling request. Control strategy: Port 1 is disconnected, ports 4 and 5, ports 2 and 3 are connected, the proportional valve cuts off the warm air circuit, and the electric drive system radiator is cooled. The letter J in the figure shows the circulating water circuit. The electric drive circulating water circuit path is: water pump 1→3IN1→MCU→oil cooler→flow proportional valve→radiator→control valve→water pump 1. The battery circulating water circuit path is: water pump 2→chiller→battery→control valve→water pump 2.

[0041] like Fig.10 As shown, when the battery is discharged, the battery is cooled, and the radiator water outlet temperature is not greater than 33°C. Control strategy: Port 1 is disconnected, ports 2 and 5, ports 3 and 4 are connected, the proportional valve cuts off the warm air circuit, the electric drive system and the battery system are connected in series, and the radiator is cooled. The letter G in the figure shows the circulating water circuit, and the circulating water circuit path is: water pump 1→3IN1→MCU→oil cooler→flow proportional valve→radiator→control valve→water pump 2→chiller→battery→water pump 1.

[0042] like Fig.11 As shown, the battery is discharged, the battery is cooled, the electric drive system has a cooling request, and there is no air conditioning request. Control strategy: Port 1 is disconnected, ports 4 and 5, ports 2 and 3 are connected, the proportional valve cuts off the warm air circuit, the battery chiller is cooled, and the electric drive system radiator is cooled. The letter H in the figure shows the circulation circuit. The electric drive circulation water path is: water pump 1→3IN1→MCU→oil cooler→flow proportional valve→radiator→control valve→water pump 1. The battery circulation water path is: water pump 2→chiller→battery→control valve→water pump 2.

[0043] like Fig.12As shown, the battery is discharged and cooled, the electric drive system has a cooling request, and there is an air conditioning request. Control strategy: Port 1 is disconnected, ports 4 and 5, ports 2 and 3 are connected, the proportional valve cuts off the warm air circuit, the battery chiller is cooled, the electric drive system radiator is cooled, and the air conditioning external condenser refrigerant is cooled. The letter I in the figure shows the circulation circuit. The electric drive circulation water path is: water pump 1→3IN1→MCU→oil cooler→flow proportional valve→radiator→control valve→water pump 1. The battery circulation water path is: water pump 2→chiller→battery→control valve→water pump 2.

[0044] The electric vehicle thermal management system of this embodiment uses a reasonable design of pipelines to use one auxiliary water tank to replenish water for three circuits, which reduces two auxiliary water tanks compared with the current solution. The cost and weight of the vehicle are reduced; through the switching and connection of the solenoid valve and the flow control of the flow proportional valve, the heat generated by the operation of the electric drive system is used to heat the battery and the heater, that is, the waste heat generated by the electric drive system is utilized and the cost of adding a separate battery and heater PTC heater is avoided; it helps to increase the vehicle's mileage and reduce the vehicle cost; through the switching and connection of the solenoid valve, the radiator and chiller are used for cooling in different temperature ranges of the battery, which reduces the system energy consumption, saves electricity, and improves the product competitiveness.

[0045] For ordinary technicians in this field, the specific embodiments are only illustrative descriptions of the present invention. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. An electric vehicle thermal management system, characterized in that: The invention comprises a control valve, a radiator, a condenser, a sub-water tank, a compressor, an evaporator, a gas-liquid separator, a flow proportional valve, a first expansion valve, a second expansion valve, a first water pump, a second water pump, a third water pump, a battery, a high-pressure three-in-one, a microcontroller, an oil cooler, a motor, a water cooler, a blower and a heater core; the control valve comprises at least 5 control ports and the 5 control ports are respectively defined as a first port, a second port, a third port, a fourth port and a fifth port, and the first port, the second port and the fourth port are The first port is the liquid inlet, and the third port and the fifth port are the liquid outlets; the compressor, condenser, gas-liquid separator, first expansion valve, second expansion valve and evaporator are connected in sequence, the first expansion valve is connected to the water cooler, and the blower and the heater core are arranged adjacent to the evaporator; the first liquid outlet of the flow proportional valve is connected to the liquid inlet of the radiator and the first port of the control valve through a pipeline, the second liquid outlet of the flow proportional valve is connected to the liquid inlet of the heater core through a pipeline, and the liquid outlet of the heater core is connected to the The second liquid inlet of the high-pressure three-in-one is connected, the liquid outlet of the radiator is connected to the second port of the control valve, the third port of the control valve is connected to the first liquid inlet of the high-pressure three-in-one through a pipeline, the liquid outlet of the high-pressure three-in-one is connected to the liquid inlet of the microcontroller, the liquid outlet of the microcontroller is connected to the liquid inlet of the oil cooler, the liquid outlet of the oil cooler is connected to the liquid inlet of the flow proportional valve, and a circulating water circuit is arranged between the oil cooler and the motor; the fifth port of the control valve is connected to the liquid inlet of the water cooler through a pipeline, the liquid outlet of the water cooler is connected to the liquid inlet of the battery through a pipeline, and the liquid outlet of the battery is connected to the fourth port of the control valve; the first water pump is arranged between the third port of the control valve and the first liquid inlet of the high-pressure three-in-one; the second water pump is arranged on the pipeline between the fifth port and the water cooler; the third water pump is arranged on the pipeline between the liquid outlet of the heater core and the second liquid inlet of the high-pressure three-in-one; When there is a heating request during the battery charging process, the first port of the control valve is controlled to be connected to the fifth port, the fourth port is connected to the third port, the second liquid outlet of the flow proportional valve is closed, and the battery is heated by the heat generated by the motor; the circulating water path is: the first water pump → high pressure three-in-one → microcontroller → oil cooler → flow proportional valve → control valve → second water pump → water cooler → battery → first water pump; When there is a cooling request during the battery charging process and the ambient temperature is not greater than 33°C, the first port of the control valve is controlled to be disconnected, the second port is connected to the fifth port, the fourth port is connected to the third port, the second liquid outlet of the flow proportional valve is closed, the radiator is used to cool the battery, the water cooler does not work, and the circulating water path is: the first water pump → high pressure three-in-one → microcontroller → oil cooler → flow proportional valve → control valve → second water pump → water cooler → battery → first water pump; When there is a cooling request during the battery charging process and the ambient temperature is greater than 33°C, the first port, the second port and the third port of the control valve are controlled to be disconnected, the fourth port is connected to the fifth port, the water cooler is used to cool the battery, and the circulating water path is: the second water pump → water cooler → battery → the second water pump; When there is a heating request and no warm air request during the battery discharge process, the second port of the control valve is disconnected, the first port is connected to the fifth port, the fourth port is connected to the third port, the second liquid outlet of the flow proportional valve is closed, and the battery is heated by waste heat. The circulating water path is: the first water pump → high pressure three-in-one → microcontroller → oil cooler → flow proportional valve → control valve → second water pump → water cooler → battery → first water pump; when there is a heating request and warm air request during the battery discharge process, the second port of the control valve is disconnected, the first port is connected to the fifth port, the fourth port is connected to the third port, the first liquid outlet and the second liquid outlet of the flow proportional valve are both opened, the flow proportional valve distributes the flow according to the battery and warm air requirements, and the battery and warm air are heated by waste heat. The circulating water path is: When the battery discharge is in a thermal equilibrium state and the electric drive system has no cooling request, the first port, the second port and the third port of the control valve are disconnected, the fourth port and the fifth port are connected, the first liquid outlet of the flow proportional valve is closed, and the high-pressure three-in-one → microcontroller → oil cooler → flow proportional valve → heater core → third water pump → high-pressure three-in-one constitutes an electric drive circulating water circuit, and the second water pump → water cooler → battery → second water pump constitutes a battery circulating water circuit; when the battery discharge is in a thermal equilibrium state and the electric drive system has a cooling request, the first port of the control valve is disconnected, the fourth port is connected to the fifth port, the second port and the third port are connected, the second liquid outlet of the flow proportional valve is closed, and the radiator is used for cooling, the first water pump → high-pressure three-in-one → microcontroller → oil cooler → flow proportional valve → radiator → first water pump constitutes an electric drive circulating water circuit, and the second water pump → water cooler → battery → second water pump constitutes a battery circulating water circuit; When there is a cooling request during the battery discharge process and the radiator water outlet temperature is not greater than 33°C, the first port of the control valve is controlled to be disconnected, the second port is connected to the fifth port, the third port is connected to the fourth port, the second liquid outlet of the flow proportional valve is closed, the electric drive system and the battery system are connected in series, and the radiator is used to cool the battery. The circulating water circuit is the first water pump → high-pressure three-in-one → MCU → oil cooler → flow proportional valve → radiator → control valve → second water pump → water cooler → battery → first water pump; when there is a cooling request during the battery discharge process, and the electric drive system has a cooling request, and there is no air conditioning request, the first port of the control valve is controlled to be disconnected, the fourth port is connected to the fifth port, the second port is connected to the third port, the second liquid outlet of the flow proportional valve is closed, the battery is cooled by the water cooler, and the electric drive system is cooled by the water cooler. The battery is cooled through the radiator, and the first water pump → high-pressure three-in-one → microcontroller → oil cooler → flow proportional valve → radiator → first water pump constitutes an electric drive circulating water circuit, and the second water pump → water cooler → battery → second water pump constitutes a battery circulating water circuit; when there is a cooling request during the discharge of the battery, and the electric drive system has a cooling request, and there is an air-conditioning request, the first port of the control valve is disconnected, the fourth port is connected to the fifth port, the second port is connected to the third port, the second liquid outlet of the flow proportional valve is closed, the battery is cooled by the water cooler, the electric drive system is cooled by the radiator, and the air conditioner is cooled by the condenser refrigerant. The first water pump → high-pressure three-in-one → microcontroller → oil cooler → flow proportional valve → radiator → control valve → first water pump constitutes an electric drive circulating water circuit, and the second water pump → water cooler → battery → second water pump constitutes a battery circulating water circuit.

2. The electric vehicle thermal management system according to claim 1, characterized in that: The control valve is an electromagnetic control valve, and the auxiliary water tank is used to supply water to the radiator and the first port of the control valve.

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