A thermal management system and method for pure electric vehicles

Abstract

This invention discloses a thermal management system and method for a pure electric vehicle. A three-way valve and a four-way valve are installed between the motor cooling circuit, the air conditioning cooling circuit, and the heating circuit. When the motor system temperature exceeds a first set threshold, the three-way valve and the four-way valve connect the motor cooling circuit to the air conditioning cooling circuit, cooling the motor cooling circuit via the air conditioning cooling circuit. When the motor system temperature is less than or equal to the first set threshold but greater than a second set threshold, and the vehicle radiator is on with the heater core temperature higher than the motor outlet water temperature, the three-way valve and the four-way valve connect the heating circuit to the motor cooling circuit, recovering heat from the motor cooling circuit to the heating circuit. When the motor system temperature is less than or equal to the second set threshold, the three-way valve and the four-way valve allow the air conditioning cooling circuit, the heating circuit, and the motor cooling circuit to operate independently. This achieves comprehensive control of the motor cooling circuit, the air conditioning cooling circuit, and the heating circuit.

Description

Technical Field

[0001] This invention relates to the field of electric bus technology, and in particular to a thermal management system and method for pure electric vehicles. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] With the development of pure electric buses, driving range has received increasing attention. In addition to measures such as increasing power battery capacity, improving drive motor efficiency, and lightweighting, it is also imperative to recover the waste heat of the motor to avoid energy waste.

[0004] Current methods for managing motor heat primarily involve connecting the vehicle's heating circuit to the motor cooling circuit, thereby recovering waste heat from the motor into the heating circuit; or connecting the air conditioning cooling circuit to the motor cooling circuit, using the air conditioning to cool the motor. However, these methods cannot achieve comprehensive control of air conditioning, heating, and motor cooling, and cannot guarantee the effective cooling of the motor while also ensuring sufficient recovery of waste heat from the motor. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a thermal management system and method for pure electric vehicles. By setting up a three-way valve and a four-way valve, and then connecting the three-way valve and the four-way valve in the corresponding directions according to specific needs, the system effectively ensures that the motor system is within a reasonable operating temperature range while recovering the heat generated by the motor, thereby increasing the driving range of the entire vehicle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Firstly, a thermal management system for a pure electric vehicle is proposed, including a motor cooling circuit, a heating circuit, an air conditioning cooling circuit, a data acquisition module, and a control module; the motor cooling circuit is connected to the air conditioning cooling circuit through a three-way valve and to the heating circuit through a four-way valve; the three-way valve and the four-way valve are connected.

[0008] The data acquisition module is used to acquire the motor system temperature, motor outlet water temperature, and heater outlet water temperature;

[0009] The control module is used to control the three-way valve and the four-way valve to connect the motor cooling circuit and the air conditioning cooling circuit when the motor system temperature is greater than the first set threshold, so that the air conditioning cooling circuit can cool the motor cooling circuit; when the motor system temperature is less than or equal to the first set threshold but greater than the second set threshold, the vehicle radiator is turned on and the heater water temperature is higher than the motor water temperature, the control module controls the three-way valve and the four-way valve to connect the heater circuit and the motor cooling circuit, so that the heat in the motor cooling circuit can be recovered to the heater circuit; when the motor system temperature is less than or equal to the second set threshold, the control module controls the three-way valve and the four-way valve to make the air conditioning cooling circuit, the heater circuit and the motor cooling circuit operate independently.

[0010] Secondly, a thermal management method for pure electric vehicles is proposed, including:

[0011] When the motor system temperature exceeds the first set threshold, the three-way valve and four-way valve are controlled to connect the motor cooling circuit to the air conditioning refrigeration circuit, and the air conditioning refrigeration circuit is used to cool the motor cooling circuit.

[0012] When the motor system temperature is less than or equal to the first set threshold and greater than the second set threshold, the vehicle radiator is turned on and the temperature of the heater water outlet is higher than the temperature of the motor water outlet, the three-way valve and the four-way valve are controlled to connect the heater circuit and the motor cooling circuit, and the heat in the motor cooling circuit is recovered to the heater circuit.

[0013] When the motor system temperature is less than or equal to the second set threshold, control the three-way valve and the four-way valve to make the air conditioning cooling circuit, the heating circuit and the motor cooling circuit operate independently.

[0014] Thirdly, an electronic device is proposed, including a memory and a processor, as well as computer instructions stored in the memory and running on the processor, wherein the computer instructions, when executed by the processor, complete the steps described in a thermal management method for a pure electric vehicle.

[0015] Fourthly, a computer-readable storage medium is proposed for storing computer instructions, which, when executed by a processor, complete the steps described in a thermal management method for a pure electric vehicle.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This invention connects the motor cooling circuit to the air conditioning refrigeration circuit using a three-way valve and the motor cooling circuit to the heating circuit using a four-way valve. It monitors the motor system temperature, motor outlet water temperature, and heating outlet water temperature. Based on the monitoring results, it controls the connection direction of the three-way and four-way valves, thereby connecting the motor cooling circuit to the air conditioning refrigeration circuit, or connecting the heating circuit to the motor cooling circuit, or allowing the motor cooling circuit, air conditioning refrigeration circuit, and heating circuit to operate independently. This achieves comprehensive coordination of the motor cooling circuit, air conditioning refrigeration circuit, and heating circuit, effectively ensuring the motor system operates within a reasonable temperature range while recovering the heat generated by the motor, thus increasing the vehicle's driving range.

[0018] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0020] Figure 1 The control flowchart of the system is disclosed as an example.

[0021] Figure 2 The structural connection block diagram of the system disclosed in the embodiment is shown below;

[0022] Figure 3 The graphs show the ball valve angle and feedback voltage of the three-way valve and four-way valve disclosed in the embodiments. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] Example 1

[0026] In this embodiment, a thermal management system for a pure electric vehicle is disclosed, such as... Figures 1-3 As shown, it includes a motor cooling circuit, a heating circuit, an air conditioning cooling circuit, a data acquisition module, and a control module; the motor cooling circuit is connected to the air conditioning cooling circuit through a three-way valve and to the heating circuit through a four-way valve; the three-way valve and the four-way valve are connected.

[0027] The data acquisition module is used to acquire the motor system temperature, motor outlet water temperature, and heater outlet water temperature;

[0028] The control module is used to control the three-way valve and the four-way valve to connect the motor cooling circuit and the air conditioning cooling circuit when the motor system temperature is greater than the first set threshold, so that the air conditioning cooling circuit can cool the motor cooling circuit; when the motor system temperature is less than or equal to the first set threshold but greater than the second set threshold, the vehicle radiator is turned on and the heater water temperature is higher than the motor water temperature, the control module controls the three-way valve and the four-way valve to connect the heater circuit and the motor cooling circuit, so that the heat in the motor cooling circuit can be recovered to the heater circuit; when the motor system temperature is less than or equal to the second set threshold, the control module controls the three-way valve and the four-way valve to make the air conditioning cooling circuit, the heater circuit and the motor cooling circuit operate independently.

[0029] In addition, the control module is also used to control the three-way valve and the four-way valve to make the air conditioning cooling circuit, the heating circuit and the motor cooling circuit operate independently when the motor system temperature is less than or equal to the first set threshold, greater than the second set threshold and the vehicle radiator is not turned on.

[0030] The control module is also used to control the three-way valve and the four-way valve to make the air conditioning cooling circuit, the heating circuit and the motor cooling circuit operate independently when the motor system temperature is less than or equal to the first set threshold and greater than the second set threshold, the vehicle radiator is turned on, but the heater water temperature is less than or equal to the motor water temperature.

[0031] The motor system is connected to the motor cooling pipes, and heat is exchanged between the motor system and the medium in the motor cooling pipes, thereby cooling the motor system.

[0032] The motor system in this embodiment includes a motor and a motor controller; both the motor and the motor controller are connected in the motor cooling circuit, which cools and de-temperatures the motor and the motor controller.

[0033] Preferably, the motor controller is an all-in-one controller.

[0034] The specific connection structure of the motor cooling circuit, air conditioning refrigeration circuit, heating circuit, three-way valve and four-way valve is as follows: the motor cooling circuit is connected to the third port V3 of the three-way valve and the third port V'3 of the four-way valve; the second port V2 of the three-way valve is connected to the air conditioning refrigeration circuit; the second port V'2 and the fourth port V'4 of the four-way valve are connected to the heating circuit; and the first port V'1 of the four-way valve is connected to the first port V1 of the three-way valve.

[0035] Preferably, the third port V3 of the three-way valve is connected to the first end of the motor cooling circuit, which is the end where the medium in the motor cooling circuit has not yet exchanged heat with the motor system; the third port V'3 of the four-way valve is connected to the second end of the motor cooling circuit, which is the end where the medium in the motor cooling circuit has exchanged heat with the motor system. The motor system is located between the three-way valve and the four-way valve.

[0036] The air conditioning refrigeration circuit includes a compressor, an ATS radiator, a condenser, a plate heat exchanger for the motor, and a plate heat exchanger for the battery. The compressor is connected to the condenser inlet, and the condenser outlet is connected to three expansion valves connected in parallel. One of the expansion valves is connected to the evaporator, another to the motor heat exchanger, and the last to the battery heat exchanger. The evaporator, motor heat exchanger, and battery heat exchanger are all connected to the compressor. The ATS radiator dissipates heat from the condenser core to the outside of the vehicle. When the compressor is working, it draws in low-temperature, low-pressure gaseous refrigerant from the evaporator, motor heat exchanger, and battery heat exchanger. After compression, the refrigerant is sent to the condenser, where it exchanges heat with the outside air and becomes liquid. The liquid then passes through the three expansion valves into the evaporator, motor heat exchanger, and battery heat exchanger, respectively. The refrigerant output from the evaporator, motor heat exchanger, and battery heat exchanger is then drawn back into the compressor.

[0037] In addition, the outlet of the motor heat exchanger is connected to the inlet of the ATS radiator.

[0038] The battery heat exchanger is also connected to the cooling pipes of the power battery pack. After the water in the power battery pack cooling pipes cools the battery pack, it enters the battery heat exchanger and exchanges heat with the refrigerant in the battery heat exchanger. After the heat exchange, the water re-enters the power battery pack cooling pipes to cool the power battery pack.

[0039] The second port V2 of the three-way valve is connected to the inlet of the motor plate heat exchanger in the air conditioning refrigeration circuit. The outlet of the ATS radiator in the air conditioning refrigeration circuit is connected to the first end of the motor cooling circuit. The medium in the motor cooling circuit can enter the motor plate heat exchanger to exchange heat with the refrigerant in the motor plate heat exchanger. After the heat exchange, the medium enters the ATS radiator for further heat exchange. After the heat exchange, the medium returns to the motor cooling circuit from the outlet of the ATS radiator through the first end of the motor cooling circuit.

[0040] The heating circuit includes the vehicle radiator and PTC. The outlet of the PTC is connected to the inlet of the vehicle radiator. The fourth port V'4 of the four-way valve is connected to the inlet of the PTC in the heating circuit. The second port V'2 of the four-way valve is connected to the outlet of the vehicle radiator in the heating circuit.

[0041] When the first port V1 and the second port V2 of the three-way valve are connected, the first port V'1 and the third port V'3 of the four-way valve are connected, and the second port V'2 and the fourth port V'4 are connected, the heating circuit operates independently, while the air conditioning cooling circuit is connected to the motor cooling circuit. After heat exchange with the motor system in the motor cooling circuit, the medium enters the motor heat exchanger in the air conditioning cooling circuit through the second end of the motor cooling circuit, the third port V'3 and the first port V'1 of the four-way valve, and the first port V1 and the second port V2 of the three-way valve. Heat exchange occurs through the motor heat exchanger, and after heat exchange, the medium is cooled by the ATS radiator and flows out from the outlet of the ATS radiator. It then returns to the motor cooling circuit through the first end of the motor cooling circuit to cool the motor system, thus achieving cooling of the motor cooling circuit through the air conditioning cooling circuit.

[0042] When the first port V1 of the three-way valve is connected to the third port V3, and the first port V'1 of the four-way valve is connected to the second port V'2, and the third port V'3 is connected to the fourth port V'4, the air conditioning refrigeration circuit operates independently, while the motor cooling circuit is connected to the heating circuit. After heat exchange with the motor system in the motor cooling circuit, the medium enters the PTC for heating through the second end of the motor cooling circuit and the third port V'3 and the fourth port V'4 of the four-way valve. After heating, the medium enters the vehicle radiator for heat dissipation. After heat dissipation, the medium re-enters the motor cooling circuit through the second port V'2 and the first port V'1 of the four-way valve, the first port V1 and the third port V3 of the three-way valve, and the first end of the motor cooling circuit to cool the motor system and recover the motor's waste heat to the heating circuit.

[0043] When the first port V1 of the three-way valve is connected to the third port V3, and the first port V'1 of the four-way valve is connected to the third port V'3, and the second port V'2 of the four-way valve is connected to the fourth port V'4, the second and first ends of the motor cooling circuit are connected through the third port V'3 and the first port V'1 of the four-way valve, and the first port V1 and the third port V3 of the three-way valve. The medium flowing out of the second end of the motor cooling circuit passes through the third port V'3 and the first port V'1 of the four-way valve, and then through the first port V1 and the third port V3 of the three-way valve, before re-entering the motor cooling circuit through the second end of the motor cooling circuit to cool the motor system. The outlet of the vehicle radiator and the inlet of the PTC are connected through the second port V'2 and the fourth port V'4 of the four-way valve, and the medium flowing out of the vehicle radiator re-enters the PTC for heating. In other words, at this time, the motor cooling circuit, the heating circuit, and the air conditioning cooling circuit operate independently.

[0044] Since the motor system includes the motor and the motor controller, the motor system temperature acquired by the data acquisition module includes the motor temperature and the motor controller temperature.

[0045] The controller is used to determine that the motor system temperature is greater than the first set threshold when the motor temperature is greater than the first set threshold or the motor controller temperature is greater than the first set threshold.

[0046] When the motor temperature exceeds the second set threshold, or the motor controller temperature exceeds the second set threshold, it is determined that the motor system temperature exceeds the second set threshold.

[0047] When both the motor temperature and the motor controller temperature are less than or equal to the first set threshold, it is determined that the motor system temperature is less than or equal to the first set threshold.

[0048] When both the motor temperature and the motor controller temperature are less than or equal to the second set threshold, the motor system temperature is determined to be less than or equal to the second set threshold.

[0049] By monitoring the motor temperature and the motor controller temperature, the accuracy of motor system temperature monitoring is ensured.

[0050] Preferably, the first set threshold is 80°C and the second set threshold is 60°C.

[0051] The specific control method of the system disclosed in this embodiment is as follows:

[0052] Step 1: After the vehicle is powered on, the vehicle sends a fixed duty cycle, such as 50%, so that the three-way valve and the four-way valve remain in the state before the vehicle was last powered off.

[0053] Step 2: Determine the motor temperature and motor controller temperature. If the motor temperature or motor controller temperature exceeds the first set threshold (e.g., 80℃), enter the "Air Conditioning-Motor" mode. The air conditioning system sends a relevant mode message to the vehicle. Upon receiving the "Air Conditioning-Motor" mode message, the vehicle sends a fixed duty cycle signal (e.g., 5%) to control the three-way valve to rotate in the V1-V2 connection direction and the four-way valve to rotate in the V'1-V'3 and V'2-V'4 connection directions. The feedback voltage of the three-way and four-way valves is continuously monitored. When a predetermined feedback voltage (e.g., 3.7V) is received, a 50% duty cycle is sent to control the three-way and four-way valves to remain in that position. The three-way valve V1-V2 is connected, and the four-way valves V'1-V'3 and V'2-V'4 are connected. The heating circuit operates independently, while the motor cooling circuit and the air conditioning cooling circuit are connected, and the air conditioning cools the motor.

[0054] Step 3: In Step 2, if both the motor temperature and the motor controller temperature are not greater than the first set threshold (e.g., 80℃), and either the motor temperature or the motor controller temperature is greater than the second set threshold (e.g., 60℃), then a comparison is made between whether the vehicle radiator is on and the motor outlet water temperature and the heater outlet water temperature. If the vehicle radiator is not on, or the vehicle radiator is on but the heater outlet water temperature is less than or equal to the motor outlet water temperature, then the vehicle enters the "self-circulation" mode. The air conditioning system sends a relevant mode message to the vehicle. After receiving the "self-circulation" mode message, the vehicle sends a fixed duty cycle signal, such as to the three-way valve. A 95% duty cycle is sent to control the three-way valve to rotate in the V1-V3 connection direction, and a 5% duty cycle is sent to the four-way valve to control it to rotate in the V'1-V'3 and V'2-V'4 connection directions. The feedback voltage of the three-way valve and the four-way valve is continuously monitored. When the predetermined feedback voltage is received, such as 1.3V for the three-way valve and 3.7V for the four-way valve, a 50% duty cycle is sent to control the three-way valve and the four-way valve to stay in that position. At this time, the three-way valve V1-V3 is connected, and the four-way valves V'1-V'3 and V'2-V'4 are connected, and each circuit operates independently.

[0055] Step 4: In the judgments of Steps 2 and 3, if both the motor temperature and the motor controller temperature are not greater than the first set threshold (e.g., 80℃), and one of the motor temperature and the motor controller temperature is greater than the second set threshold (e.g., 60℃), and the vehicle radiator is on with the heater core temperature higher than the motor outlet temperature, then the vehicle enters the "Motor-Heater" mode. The air conditioning system sends a relevant mode message to the vehicle. After receiving the "Motor-Heater" mode message, the vehicle sends a fixed duty cycle signal, such as a 95% duty cycle signal to the three-way valve, controlling the three-way valve to rotate in the V1-V3 connection direction. The system rotates, sending a 95% duty cycle to the four-way valve to control it to rotate in the V'1-V'2 and V'3-V'4 connection directions. It continuously monitors the feedback voltage of the three-way and four-way valves. When a predetermined feedback voltage, such as 1.3V, is received, a 50% duty cycle is sent to control the three-way and four-way valves to stay in that position. At this time, the three-way valve V1-V3 is connected, and the four-way valves V'1-V'2 and V'3-V'4 are connected. The air conditioning refrigeration circuit operates independently, while the motor cooling circuit and the heating circuit are connected. The waste heat generated by the motor is recovered into the vehicle's heating circuit.

[0056] Step 5: After step 4, it will be determined whether the motor temperature and the motor controller temperature are both less than or equal to the second set threshold, such as 60℃. If the motor temperature and the motor controller temperature are both less than the second set threshold, the three-way valves V1-V3, the four-way valves V'1-V'3 and V'2-V'4 will be connected, and each circuit will operate independently and perform self-circulation, executing the actions described in step 3.

[0057] Step 6: After this, the temperature and the status of each component will be continuously monitored until the vehicle is powered off.

[0058] This embodiment connects the motor cooling circuit to the air conditioning cooling circuit using a three-way valve and the motor cooling circuit to the heating circuit using a four-way valve. It monitors the motor system temperature, motor outlet water temperature, and heating outlet water temperature. Based on the monitoring results, it controls the connection direction of the three-way and four-way valves, thereby connecting the motor cooling circuit to the air conditioning cooling circuit, or connecting the heating circuit to the motor cooling circuit, or allowing the motor cooling circuit, air conditioning cooling circuit, and heating circuit to operate independently. This effectively ensures that the motor system is within a reasonable operating temperature range while recovering the heat generated by the motor, increasing the vehicle's driving range.

[0059] Example 2

[0060] In this embodiment, a thermal management method for a pure electric vehicle is disclosed, comprising:

[0061] When the motor system temperature exceeds the first set threshold, the three-way valve and four-way valve are controlled to connect the motor cooling circuit to the air conditioning refrigeration circuit, and the air conditioning refrigeration circuit is used to cool the motor cooling circuit.

[0062] When the motor system temperature is less than or equal to the first set threshold and greater than the second set threshold, the vehicle radiator is turned on and the temperature of the heater water outlet is higher than the temperature of the motor water outlet, the three-way valve and the four-way valve are controlled to connect the heater circuit and the motor cooling circuit, and the heat in the motor cooling circuit is recovered to the heater circuit.

[0063] When the motor system temperature is less than or equal to the second set threshold, control the three-way valve and the four-way valve to make the air conditioning cooling circuit, the heating circuit and the motor cooling circuit operate independently.

[0064] Example 3

[0065] In this embodiment, an electronic device is disclosed, including a memory and a processor, as well as computer instructions stored in the memory and running on the processor. When the processor executes the computer instructions, it completes the steps described in the thermal management method for a pure electric vehicle disclosed in Embodiment 2.

[0066] Example 4

[0067] In this embodiment, a computer-readable storage medium is disclosed for storing computer instructions, which, when executed by a processor, complete the steps described in the thermal management method for a pure electric vehicle disclosed in Embodiment 2.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A thermal management system for a pure electric vehicle, characterized in that, It includes a motor cooling circuit, a heating circuit, an air conditioning cooling circuit, a data acquisition module, and a control module; the motor cooling circuit is connected to the air conditioning cooling circuit via a three-way valve and to the heating circuit via a four-way valve; the three-way valve and the four-way valve are connected. The motor cooling circuit is connected to the third port of the three-way valve and the third port of the four-way valve. The second port of the three-way valve is connected to the air conditioning refrigeration circuit. The second and fourth ports of the four-way valve are connected to the heating circuit. The first port of the four-way valve is connected to the first port of the three-way valve. When the first and second ports of the three-way valve are connected, and the first and third ports of the four-way valve are connected, and the second and fourth ports are connected, the air conditioning refrigeration circuit and the motor cooling circuit are connected. When the first port of the three-way valve is connected to the third port, and the first port of the four-way valve is connected to the second port and the third port is connected to the fourth port, the motor cooling circuit and the warm air circuit are connected. When the first port of the three-way valve is connected to the third port, and the first port of the four-way valve is connected to the third port and the second port is connected to the fourth port, the motor cooling circuit, the heating circuit and the air conditioning cooling circuit operate independently. The data acquisition module is used to acquire the motor system temperature, motor outlet water temperature, and heater outlet water temperature; The control module is used to control the three-way valve and the four-way valve to connect the motor cooling circuit and the air conditioning cooling circuit when the motor system temperature is greater than the first set threshold, so that the air conditioning cooling circuit can cool the motor cooling circuit; when the motor system temperature is less than or equal to the first set threshold but greater than the second set threshold, the vehicle radiator is turned on and the heater water temperature is higher than the motor water temperature, the control module controls the three-way valve and the four-way valve to connect the heater circuit and the motor cooling circuit, so that the heat in the motor cooling circuit can be recovered to the heater circuit; when the motor system temperature is less than or equal to the second set threshold, the control module controls the three-way valve and the four-way valve to make the air conditioning cooling circuit, the heater circuit and the motor cooling circuit operate independently.

2. The thermal management system for a pure electric vehicle as described in claim 1, characterized in that, The control module is also used to control the three-way valve and the four-way valve to make the air conditioning cooling circuit, the heating circuit and the motor cooling circuit operate independently when the motor system temperature is less than or equal to the first set threshold, greater than the second set threshold and the vehicle radiator is not turned on.

3. The thermal management system for a pure electric vehicle as described in claim 1, characterized in that, The control module is also used to control the three-way valve and the four-way valve to make the air conditioning cooling circuit, the heating circuit and the motor cooling circuit operate independently when the motor system temperature is less than or equal to the first set threshold and greater than the second set threshold, the vehicle radiator is turned on, but the heater water temperature is less than or equal to the motor water temperature.

4. The thermal management system for a pure electric vehicle as described in claim 1, characterized in that, The fourth port of the four-way valve is connected to the PTC inlet in the heating circuit, and the second port of the four-way valve is connected to the outlet of the radiator in the heating circuit.

5. A thermal management system for a pure electric vehicle as described in claim 1, characterized in that, The third port of the three-way valve is connected to the first end of the motor cooling circuit, and the third port of the four-way valve is connected to the second end of the motor cooling circuit. The motor system is located between the three-way valve and the four-way valve.

6. The thermal management system for a pure electric vehicle as described in claim 1, characterized in that, The data acquisition module obtains the motor system temperature, including the motor temperature and the motor controller temperature; The controller is used to determine that the motor system temperature is greater than the first set threshold when the motor temperature is greater than the first set threshold or the motor controller temperature is greater than the first set threshold. When the motor temperature exceeds the second set threshold, or the motor controller temperature exceeds the second set threshold, it is determined that the motor system temperature exceeds the second set threshold. When both the motor temperature and the motor controller temperature are less than or equal to the first set threshold, it is determined that the motor system temperature is less than or equal to the first set threshold. When both the motor temperature and the motor controller temperature are less than or equal to the second set threshold, the motor system temperature is determined to be less than or equal to the second set threshold.

7. A management method for a thermal management system of a pure electric vehicle as described in any one of claims 1-6, characterized in that, include: When the motor system temperature exceeds the first set threshold, the three-way valve and four-way valve are controlled to connect the motor cooling circuit to the air conditioning refrigeration circuit, and the air conditioning refrigeration circuit is used to cool the motor cooling circuit. When the motor system temperature is less than or equal to the first set threshold and greater than the second set threshold, the vehicle radiator is turned on and the temperature of the heater water outlet is higher than the temperature of the motor water outlet, the three-way valve and the four-way valve are controlled to connect the heater circuit and the motor cooling circuit, and the heat in the motor cooling circuit is recovered to the heater circuit. When the motor system temperature is less than or equal to the second set threshold, control the three-way valve and the four-way valve to make the air conditioning cooling circuit, the heating circuit and the motor cooling circuit operate independently.

8. An electronic device, characterized in that, It includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, which, when executed by the processor, complete the steps of the management method of claim 7.

9. A computer-readable storage medium, characterized in that, Used to store computer instructions, which, when executed by a processor, complete the steps of the management method described in claim 7.

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