A thermal management system and method for a low-temperature pulse heating motor

Abstract

This invention discloses a low-temperature pulse heating motor thermal management system and its thermal management method, belonging to the field of thermal management technology for new energy pure electric vehicles / hybrid vehicles. Specifically, when the ambient temperature is below a low-temperature threshold and the battery requests a heating up, the thermal management controller controls the motor controller to perform pulse heating and switches the thermal management multi-way valve to a small-loop circulation mode, initiating pulse heating of the motor. When the motor temperature reaches a threshold, the motor cools down through an oil pump and a water cooler, and pulse heating stops, switching to a battery waste heat utilization mode. When the battery temperature reaches a threshold, the battery water pump starts to cool the battery. When the temperature continues to rise to a high-temperature threshold, pulse heating stops, switching to a battery equalization mode. The three modes are dynamically adjusted in real time according to the temperature changes of the battery and motor, effectively improving the battery heating efficiency while reducing the energy consumption of the battery and motor during the heating process.

Description

Technical Field

[0001] This invention belongs to the field of thermal management technology for electric motors in new energy pure electric vehicles / hybrid vehicles, specifically relating to a low-temperature pulse heating motor thermal management system and its thermal management method. Background Technology

[0002] Existing lithium-ion batteries for electric vehicles exhibit reduced chemical activity at low temperatures, leading to a rapid decline in low-temperature charge and discharge performance. Heating the battery at low temperatures requires significant energy and considerable time. While some mass-produced vehicles incorporate low-temperature pulse heating technology, its optimal battery heating efficiency is limited by the lack of optimized matching between the pulse heating and motor thermal management solutions. To address these issues and reduce the energy consumption and practicality of low-temperature heating for lithium-ion batteries, a low-temperature pulse heating method for motor thermal management has been proposed.

[0003] Chinese Patent Publication No. CN112977173A discloses an electric vehicle and its power battery pulse heating system and heating method. The motor system includes a motor controller and a three-phase motor. The motor controller includes a motor control unit, three-phase bridge arms, and a bus capacitor C. The bus capacitor C is connected in parallel with the three-phase bridge arms. The control terminals of the six power switches of the three-phase bridge arms are respectively connected to the six control output terminals of the motor control unit. The midpoints of the three-phase bridge arms are respectively connected to the three-phase stator windings of the three-phase motor. The motor speed signal output terminal and the motor rotor position signal output terminal of the three-phase motor are respectively connected to the two signal acquisition terminals of the motor control unit. The three-phase bridge arms are connected to the power battery to form a power battery pulse heating circuit. The method is as follows: when the pulse heating entry condition is met, the motor system enters the pulse heating mode to pulse heat the power battery; when the pulse heating exit condition is met, the motor system exits the pulse heating mode and stops pulse heating the power battery. This heating method can increase the heating speed and improve the heating effect. However, when the pulse heating mode is exited, the system stops heating, and the heat that was not absorbed during the battery heating process is not used properly, resulting in unnecessary energy consumption during the heating process. Summary of the Invention

[0004] The purpose of this invention is to provide a low-temperature pulse heating motor thermal management system and its thermal management method to solve the technical problems of low battery heating efficiency and high battery heating energy consumption.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A low-temperature pulse heating motor thermal management system includes a thermal management controller, a motor controller, a motor stator, a thermal management multi-way valve, a battery water pump, a motor water pump, an oil pump, an oil cooler, a water cooler, and a battery temperature sensor.

[0007] The motor controller is connected to the thermal management controller and the battery temperature sensor, which is located in the battery compartment.

[0008] The cooling water outlet of the water cooler is connected to the first inlet of the thermal management multi-way valve; the second outlet of the thermal management multi-way valve is connected to the cooling water inlet of the water cooler.

[0009] The cooling water inlet of the motor controller is connected to the first outlet of the thermal management multi-way valve, and the cooling water outlet of the motor controller is connected to the cooling water inlet of the oil cooler; the cooling water outlet of the oil cooler is connected to the second inlet of the thermal management multi-way valve through the motor water pump.

[0010] The cooling water outlet in the battery compartment is connected to the third inlet of the thermal management multi-way valve, and the third outlet of the thermal management multi-way valve is connected to the cooling water inlet in the battery compartment through the battery water pump.

[0011] The thermal management controller is connected to the control terminal of the thermal management multi-way valve;

[0012] The motor controller is connected to the motor stator; the cooling oil outlet of the motor stator passes through the oil pump in sequence and is connected to the cooling oil inlet of the motor stator to form a loop.

[0013] The thermal management controller is connected to an ambient temperature sensor. Based on the current ambient temperature detected by the sensor and whether the battery has a heating request, the thermal management controller determines whether to activate pulse heating. If so, the thermal management controller sends a pulse heating request.

[0014] A stator temperature sensor is installed on the motor stator, and the motor controller is connected to the stator temperature sensor.

[0015] The motor controller is equipped with a motor inlet water temperature sensor at the cooling water inlet.

[0016] The motor controller adjusts the opening degree of the motor water pump based on the stator temperature sensor and the motor inlet water temperature sensor.

[0017] The cooling water inlet and outlet of the battery compartment are equipped with battery inlet water temperature sensors and battery outlet water temperature sensors, respectively.

[0018] A method for thermal management of a motor using low-temperature pulse heating, based on the aforementioned low-temperature pulse heating motor thermal management system, includes one or more of the following: pulse heating mode, motor waste heat utilization mode, or battery equalization mode.

[0019] Pulse heating mode: When the ambient temperature < X °C and the battery issues a heating request, the thermal management controller sends a pulse heating request to the motor controller. The thermal management controller controls the thermal management multi-way valve to be in the small loop circulation mode, and the motor controller controls the motor stator to start pulse heating. At this time, the oil pump and the motor water pump are turned on. While the motor oil and cooling water cool the motor stator in the corresponding circuits, the heat is exported to the battery through the oil cooler;

[0020] Motor waste heat utilization mode: When the temperature of the motor stator > A °C, the thermal management controller sends a request to pause pulse heating to the motor controller. The thermal management controller controls the thermal management multi-way valve to switch to the motor waste heat utilization mode. The battery compartment is connected to the water cooler through the thermal management multi-way valve, and the battery water pump is connected to the motor water pump. The motor controller controls the motor stator to stop pulse heating;

[0021] Battery temperature equalization mode: When the temperature difference of the battery before and after heating > C °C, the thermal management controller sends a request to pause pulse heating to the motor controller. The thermal management controller controls the thermal management multi-way valve to switch to the battery temperature equalization mode. The battery compartment, the battery water pump and the water cooler are connected in series through the thermal management multi-way valve. The motor controller controls the motor stator to stop pulse heating;

[0022] Among them, X, A, and C are preset temperatures.

[0023] When the ambient temperature ≥ X °C and the battery has no heating request, the thermal management controller exits the pulse heating system and dissipates heat from the electric drive or the motor as needed; when the ambient temperature ≥ X °C and the battery has a heating request, pulse heating is performed based on the actual internal temperature of the battery.

[0024] In the motor waste heat utilization mode, when the temperature of the motor stator < Y °C and the temperature difference between the inlet and outlet water of the battery < E °C, or when the operation time of the waste heat utilization mode > F min, the thermal management controller controls the thermal management multi-way valve to switch to the small loop circulation mode, and the thermal management controller sends a new pulse heating request. The motor controller controls the motor stator to start pulse heating again; among them, F is the preset time.

[0025] In the battery temperature equalization mode, when the temperature difference of the battery before and after heating < D °C, the thermal management controller switches the thermal management multi-way valve to the small loop circulation mode and sends a pulse heating request to the motor controller. The motor controller controls the motor stator to start pulse heating again; among them, D is the preset temperature.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The low-temperature pulse heating motor thermal management system disclosed in this invention has three closed-loop circulation loops. Each stage operates simultaneously without affecting the others, reducing mutual influencing factors. All three loops are connected to a thermal management controller for unified management. While ensuring independence, the data of each stage can be synchronized in real time, improving the battery's heating efficiency. Simultaneously, both the motor and battery have their own water pumps connected to water coolers, and the oil pump is also connected to an oil cooler. This allows for timely cooling of the battery and motor during heating, improving equipment performance, reducing energy consumption during the heating process, and effectively enhancing the battery's heating efficiency.

[0028] Furthermore, temperature sensors are installed at the motor controller, motor stator, and battery inlet / outlet water points. The thermal management controller can monitor the status of the motor and battery in real time based on these temperature sensors, and adjust the thermal management mode and the opening degree of the motor water pump and battery water pump in real time, effectively improving the thermal management efficiency of the present invention, that is, improving the battery heating efficiency.

[0029] Furthermore, all three circuits are connected to a water pump, which can accelerate the removal of heat from the motor and also speed up the cooling process, thereby improving the battery's heating efficiency.

[0030] Furthermore, in the circuits of the oil pump, oil cooler, and motor stator, the motor oil can be recycled within these circuits, reducing energy consumption costs. At the same time, driven by water cooling, the motor oil's flow rate is accelerated, further accelerating the motor's cooling speed and heating efficiency, thus improving the battery's heating efficiency.

[0031] The low-temperature pulse heating motor thermal management method provided by this invention has different threshold conditions set for different thermal management modes. The different threshold settings allow the battery to perform different processing modes under different environments. If the temperature is insufficient, pulse heating is activated; if the temperature is sufficient, pulse heating is paused and the motor waste heat utilization mode is entered, so that the waste heat of the motor can be fully utilized by the battery. If the temperature is too high, the battery equalization mode is activated. This control method not only makes reasonable use of the heat generated by the motor, but also effectively improves the battery heating efficiency. At the same time, during the heating process, when the battery temperature is too high, the battery water pump is activated to cool the battery, avoiding damage to the battery due to excessive internal temperature and reducing maintenance costs.

[0032] Furthermore, in the battery temperature equalization mode, the motor water pump and the battery water pump are connected in series, and the temperature inside the battery is evenly distributed, which avoids the battery being damaged due to excessively high temperature of individual cells and further reduces losses.

[0033] Furthermore, the thermal management method of the present invention provides a method for determining whether a battery requires pulse heating, which is applicable to battery heating situations under different circumstances. It can adjust the thermal management mode in a timely manner according to changes in battery temperature or ambient temperature, thereby improving battery heating efficiency and system thermal management efficiency. At the same time, during pulse heating, the thermal management controller monitors the battery temperature in real time. If the battery temperature is too high, the battery water pump is immediately turned on to cool the battery, reducing the risk of excessive battery temperature rise and significant battery damage.

[0034] Furthermore, in the battery waste heat utilization mode, the temperature changes of the motor stator and the battery are monitored in real time. Based on the temperature changes of both, the thermal management controller determines whether the waste heat generated by the motor has been completely absorbed by the battery. If it has been completely absorbed, the preheating utilization mode is paused. This method ensures that the heat generated by the motor is used to heat the battery, effectively preventing energy waste. Secondly, if the preheating utilization mode runs for too long and reaches the system-set threshold F, the mode is automatically paused. This method ensures the battery temperature rise and prevents the phenomenon of the preheating utilization mode running for too long without the battery temperature reaching the target temperature, further improving the heating efficiency.

[0035] Furthermore, during battery temperature equalization mode operation, the thermal management controller monitors the battery temperature in real time through the battery temperature sensor. If the battery temperature drops during the temperature equalization mode operation, resulting in a reduction in the temperature difference with that before heating to a certain value, the pulse heating mode can be restarted, which can effectively improve the battery heating efficiency. At the same time, the water circulation of the battery water pump makes the internal temperature of the battery uniform, avoids overheating of individual cells, and also reduces unnecessary energy consumption during the heating process. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the motor thermal management system.

[0037] Figure 2 A schematic diagram showing the switching of a thermal management multi-way valve to the motor waste heat utilization mode;

[0038] Figure 3 A schematic diagram showing the thermal management multi-way valve switching to battery temperature equalization mode;

[0039] Figure 4 This is the system logic diagram.

[0040] Numbering Explanation: 1. Thermal Management Controller; 2. Motor Controller; 3. Motor Stator; 4. Thermal Management Multi-Way Valve; 5. Battery Water Pump; 6. Motor Water Pump; 7. Oil Pump; 8. Oil Cooler; 9. Water Cooler; 10. Ambient Temperature Sensor; 11. Stator Temperature Sensor; 12. Motor Inlet Water Temperature Sensor; 13. Battery Temperature Sensor; 14. Battery Inlet Water Temperature Sensor; 15. Battery Outlet Water Temperature Sensor; 16. First Inlet; 17. Second Inlet; 18. Third Inlet; 19. First Outlet; 20. Second Outlet; 21. Third Outlet. Detailed Implementation

[0041] To further understand the content of this invention, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the invention.

[0042] See Figure 1 , Figure 2 , Figure 3 , Figure 4 An ambient temperature sensor 10 is installed on the thermal management controller 1. The thermal management controller 1 is connected to the motor controller 2 and the battery temperature sensor 13, which is located in the battery compartment. The motor controller 2 is connected to the motor stator 3. The oil pump 7 is connected to the cooling oil inlet of the motor stator 3. The cooling oil outlet of the oil cooler 8 passes through the oil pump 7 and the motor stator 3 in sequence to form a loop. The cooling water outlet of the motor controller 2 is connected to the cooling water inlet of the oil cooler 8. The cooling water outlet of the oil cooler 8 is connected to the second inlet 17 of the thermal management multi-way valve 4 through the motor water pump 6. The cooling water outlet of the water cooler 9 is connected to the first inlet 16 of the thermal management multi-way valve 4. The motor water pump 6 is connected to the water cooler 9 through the thermal management multi-way valve 4. The second outlet 2 of the thermal management multi-way valve 4... The inlet of the water cooler 9 is connected to the motor controller 2. The cooling water inlet of the motor controller 2 is connected to the first outlet 19 of the thermal management multi-way valve 4. The motor controller 2 is connected to the motor stator 3. A stator temperature sensor 11 is installed on the motor stator 3. The motor controller 2 is connected to the stator temperature sensor 11. A motor inlet water temperature sensor 12 is installed at the cooling water inlet of the motor controller 2. The cooling water outlet in the battery compartment is connected to the third inlet 18 of the thermal management multi-way valve 4. The third outlet 21 of the thermal management multi-way valve 4 is connected to the cooling water inlet in the battery compartment through the battery water pump 5. A battery inlet water temperature sensor 14 and a battery outlet water temperature sensor 15 are respectively installed at the cooling water inlet and outlet of the battery compartment. The thermal management controller 1 is connected to the control terminal of the thermal management multi-way valve 4.

[0043] When the motor thermal management system is in the motor waste heat utilization mode, the thermal management multi-way valve 4 switches to the motor waste heat utilization mode. At this time, the outlet of the motor water pump 6 is connected to the second inlet 17 of the thermal management multi-way valve 4, the third outlet 21 of the thermal management multi-way valve 4 is connected to the inlet of the battery water pump 5, the second inlet 17 and the third outlet 21 of the thermal management multi-way valve 4 are connected, and the motor water pump 6 is connected to the battery water pump 5 through the thermal management multi-way valve 4. The battery and motor water circuits are connected in series to form a water circuit circulation.

[0044] When the motor thermal management system is in the battery temperature equalization mode, the first inlet 16 and the third outlet 21 of the thermal management multi-way valve 4 are connected, and the cooling water outlet of the water cooler 9 is connected to the water inlet of the battery water pump 5 through the thermal management multi-way valve 4; the third inlet 18 and the second outlet 20 of the thermal management multi-way valve 4 are connected, and the inside of the battery compartment is connected to the cooling water inlet of the water cooler 9; a separate water circulation loop is formed inside the battery compartment; the second inlet 17 and the first outlet 19 of the thermal management multi-way valve 4 are connected, and the motor water pump 6 is connected to the motor controller 2 through the thermal management multi-way valve 4, and a separate oil circulation loop is formed inside the motor. The motor oil circulation and the battery water circulation do not interfere with each other.

[0045] A motor thermal management system with low-temperature pulse heating and its thermal management method:

[0046] First, the thermal management controller 1 determines whether the battery needs to be heated according to the current ambient temperature detected by the ambient temperature sensor 10 and whether the battery has a heating request. If the current ambient temperature ≥ X °C and the battery has no heating request, the thermal management controller 1 exits the pulse heating system and dissipates heat from the electric drive or the motor as needed; if the current ambient temperature ≥ X °C and the battery has a heating request, pulse heating or PTC heating is selected based on the actual internal temperature of the battery; if the current ambient temperature < X °C and the battery temperature is lower than the target temperature, the battery sends a heating request, the thermal management controller 1 sends a heating request to the motor controller 2, and the motor controller 2 controls the motor stator 3 to perform pulse heating. At the same time, the thermal management controller 1 controls the thermal management multi-way valve 4 to rotate to the small loop circulation mode, so that as much energy as possible generated by the pulse heating of the motor stator 3 is stored inside the battery, thereby increasing the battery temperature. During the battery heating process, the battery temperature sensor 13 monitors the temperature change of the battery in real time, and the thermal management controller 1 dynamically adjusts the frequency and current of the pulse heating of the motor stator 3 according to the temperature detected by the battery temperature sensor 13.

[0047] When the motor stator 3 is pulse-heated to raise the battery temperature, the motor stator 3 generates a large amount of heat. The stator temperature sensor 11 installed on the motor stator 3 monitors the temperature change of the motor stator 3 in real time. Based on the temperature detected by the stator temperature sensor 11, the thermal management controller 1 controls the motor controller 2 to start the oil pump 7. The oil pump 7 pumps motor oil into the motor to absorb the heat generated by the motor stator 3 and then discharges the heat through the oil cooler 8 to cool the motor stator 3. The cooled motor oil after discharging the heat returns to the oil pump 7 from the oil cooler 8. The motor oil forms a loop in the oil pump 7, the motor stator 3 and the oil cooler 8.

[0048] Because motor oil has high viscosity and slow flow rate, its cooling speed is also slow. Therefore, the motor water pump 6 is turned on simultaneously. The water from the motor water pump 6 enters the water cooler 9 through the thermal management multi-way valve 4. After passing through the water cooler 9, the room temperature water becomes cooling water. The cooling water passes through the motor controller 2 and the motor stator 3 in sequence and then enters the oil cooler 8. When the cooling water passes through the motor controller 2 and the motor stator 3, it absorbs the residual heat from the motor oil cooling the motor controller 2 and the motor stator 3. Finally, it exchanges heat with the motor oil that has absorbed a large amount of heat in the oil cooler 8. The cooled motor oil returns to the oil pump, and the water that has absorbed heat returns to the motor water pump 6. The system circulates in the loop formed by the motor controller 2, the oil cooler 8, the motor water pump 6, and the water cooler 9.

[0049] During the above process, the motor controller 2 adjusts the opening degree of the motor water pump in real time according to the temperature detected by the stator temperature sensor 11 installed on the motor stator 3 and the motor water inlet temperature sensor 12 set at the water inlet end of the motor controller 2.

[0050] During pulse heating, the motor heats up faster than the battery. Therefore, the thermal management controller 1 determines whether to pause pulse heating based on the temperature of the motor stator 3 detected by the stator temperature sensor 11. If the temperature of the motor stator 3 detected by the stator temperature sensor 11 is greater than A℃, the thermal management controller 1 sends a request to the motor controller 2 to pause heating and controls the thermal management multi-way valve 4 to rotate to the motor waste heat utilization mode. The battery water pump 5 and the motor water pump are connected in series. The motor controller 2 controls the motor stator 3 to pause pulse heating. The motor controller 2 turns on the motor water pump 6 and the oil pump 7. The cooling water circulates in the loop formed by the motor controller 2, the oil cooler 8, the motor water pump 6 and the water cooler 9 to cool the motor. The motor oil produced by the oil pump 7 circulates in the loop formed by the oil pump 7, the oil cooler 8 and the motor stator 3 to cool the motor. In the waste heat utilization mode of the motor, the battery and the motor water circuit are connected in series to form a water circuit circulation. The heat discharged from the motor stator 3 enters the battery through the coolant of the oil cooler 8 to heat the battery. At the same time, the cooling water that has absorbed the heat enters the motor water pump 6, and then enters the battery water pump 5 to maintain the water circuit circulation. Finally, it enters the battery to heat the battery with the remaining heat of the motor.

[0051] In the motor waste heat utilization mode, if the temperature of the motor stator 3 detected by the stator temperature sensor 11 < Y °C (Y < A) and the temperature difference between the inlet and outlet water temperatures of the battery < E °C (the temperature difference < E proves that the waste heat of the motor stator is fully absorbed by the battery); or, the motor waste heat utilization mode > F min, then the waste heat utilization mode is suspended, and the thermal management controller 1 sends a pulse heating request to the motor controller 2 again. The thermal management multi-way valve 4 switches to the small loop circulation mode, and the controller 1 controls the motor stator 3 to restart pulse heating.

[0052] During the battery pulse heating process, the battery temperature sensor 13 monitors the temperature change of the battery in real time. If the temperature difference change before and after the battery heating > B °C, the thermal management controller 1 controls the battery water pump 5 to start, and the cooling water of the battery water pump 5 cools the battery along the water path; if the battery continues to heat up until the temperature difference change > C °C (C > B), the thermal management controller 1 sends a request to the motor controller 2 to pause the pulse heating. At the same time, the thermal management controller 1 controls the thermal management multi-way valve 4 to switch to the battery temperature equalization mode.

[0053] In the battery temperature equalization mode, the battery outlet water temperature sensor 15 at the outlet of the battery temperature sensor 13 is connected to the water cooler 9 through the thermal management multi-way valve 4, and the water cooler 9 is connected to the battery water pump 5 through the thermal management multi-way valve 4. The battery temperature sensor 13, the battery outlet water temperature sensor 15, the thermal management multi-way valve 4, the water cooler 9, the battery water pump 5, and the battery inlet water temperature sensor 14 form a loop; the water of the battery water pump 5 forms a water circulation in this loop to make the internal temperature of the battery uniform and avoid overheating of individual battery cells.

[0054] After the battery temperature equalization mode, if the battery temperature difference < D °C (D < C), the thermal management controller 1 sends a pulse heating request to the motor controller 2, and the thermal management multi-way valve 4 switches to the small loop circulation mode, and the motor controller 2 controls the motor stator 3 to restart pulse heating.

[0055] Repeat the above steps until the battery is heated to the target temperature, and then stop the heating request. Then the thermal management of the low-temperature pulse heating condition ends.

[0056] The motor thermal management system with low-temperature pulse heating proposed by the present invention can be applied in the following scenarios:

[0057] After low-temperature soaking of the vehicle, before starting the vehicle, it is necessary to quickly heat the battery pack to improve the vehicle performance. (The vehicle reservation function can be used to start heating in advance);

[0058] After low-temperature soaking of the vehicle, high-power fast charging is required. The thermal management solution with low-temperature pulse heating of the present invention can be used to heat the battery. The heating efficiency is better than that of using pulse heating alone and using PTC heating alone, and the battery charging time can be shortened.

[0059] 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 low-temperature pulse heating motor thermal management system, characterized in that, It includes a thermal management controller (1), a motor controller (2), a motor stator (3), a thermal management multi-way valve (4), a battery water pump (5), a motor water pump (6), an oil pump (7), an oil cooler (8), a water cooler (9), and a battery temperature sensor (13). The motor controller (2) is connected to the thermal management controller (1) and the battery temperature sensor (13), which is located in the battery compartment; The cooling water outlet of the water cooler (9) is connected to the first inlet (16) of the thermal management multi-way valve (4); the second outlet (20) of the thermal management multi-way valve (4) is connected to the cooling water inlet of the water cooler (9); The cooling water inlet of the motor controller (2) is connected to the first outlet (19) of the thermal management multi-way valve (4), and the cooling water outlet of the motor controller (2) is connected to the cooling water inlet of the oil cooler (8); the cooling water outlet of the oil cooler (8) is connected to the second inlet (17) of the thermal management multi-way valve (4) through the motor water pump (6). The cooling water outlet in the battery compartment is connected to the third inlet (18) of the thermal management multi-way valve (4), and the third outlet (21) of the thermal management multi-way valve (4) is connected to the cooling water inlet in the battery compartment through the battery water pump (5). The thermal management controller (1) is connected to the control terminal of the thermal management multi-way valve (4); The motor controller (2) is connected to the motor stator (3); the oil pump (7) is connected to the cooling oil inlet of the motor stator (3), and the cooling oil of the oil cooler (8) passes through the oil pump (7) and the motor stator (3) in sequence from the cooling oil outlet of the oil cooler (8) to form a circuit.

2. The low-temperature pulse heating motor thermal management system according to claim 1, characterized in that, The thermal management controller (1) is connected to an ambient temperature sensor (10). The thermal management controller (1) determines whether to enable pulse heating based on the current ambient temperature detected by the ambient temperature sensor (10) and whether the battery has a heating request. If so, the thermal management controller (1) issues a pulse heating request.

3. The low-temperature pulse heating motor thermal management system according to claim 1, characterized in that, A stator temperature sensor (11) is installed on the motor stator (3), and the motor controller (2) is connected to the stator temperature sensor (11).

4. The low-temperature pulse heating motor thermal management system according to claim 3, characterized in that, The motor controller (2) is equipped with a motor inlet water temperature sensor (12) at the cooling water inlet.

5. A low-temperature pulse heating motor thermal management system according to claim 4, characterized in that, The motor controller (2) adjusts the opening degree of the motor water pump (6) according to the stator temperature sensor (11) and the motor inlet water temperature sensor (12).

6. The low-temperature pulse heating motor thermal management system according to claim 1, characterized in that, The battery compartment cooling water inlet and the battery compartment cooling water outlet are respectively equipped with a battery inlet water temperature sensor (14) and a battery outlet water temperature sensor (15).

7. A method for thermal management of a motor using low-temperature pulse heating, characterized in that, A low-temperature pulse heating motor thermal management system based on any one of claims 1 to 6 includes one or more of the following: pulse heating mode, motor waste heat utilization mode, or battery temperature equalization mode: Pulse heating mode: When the ambient temperature is < X℃ and the battery sends a heating request, the thermal management controller (1) sends a pulse heating request to the motor controller (2). The thermal management controller (1) controls the thermal management multi-way valve (4) to be in small loop circulation mode. The motor controller (2) controls the motor stator (3) to start pulse heating. At this time, the oil pump (7) and the motor water pump (6) are turned on. The motor oil and cooling water cool the motor stator in the corresponding loops, and at the same time, the heat is discharged into the battery through the oil cooler (8). Motor waste heat utilization mode: When the motor stator temperature > A℃, the thermal management controller (1) sends a request to the motor controller (2) to stop pulse heating. The thermal management controller (1) controls the thermal management multi-way valve (4) to switch to the motor waste heat utilization mode. The battery compartment is connected to the water cooler (9) through the thermal management multi-way valve (4). The battery water pump (5) is connected to the motor water pump (6). The motor controller (2) controls the motor stator (3) to stop pulse heating. Battery temperature equalization mode: When the temperature difference between the battery before and after heating is > C℃, the thermal management controller (1) sends a request to the motor controller (2) to pause pulse heating. The thermal management controller (1) controls the thermal management multi-way valve (4) to switch to battery temperature equalization mode. The battery compartment, battery water pump (5) and water cooler (9) are connected in series through the thermal management multi-way valve (4). The motor controller (2) controls the motor stator (3) to stop pulse heating. Where X, A, and C are preset temperatures.

8. The method for thermal management of a motor using low-temperature pulse heating according to claim 7, characterized in that, When the ambient temperature is ≥ X℃ and the battery does not request heating, the thermal management controller (1) exits the pulse heating system and cools the electric drive or motor as needed; when the ambient temperature is ≥ X℃ and the battery requests heating, pulse heating is performed based on the actual internal temperature of the battery.

9. A method for thermal management of a motor using low-temperature pulse heating according to claim 7, characterized in that, In the waste heat utilization mode of the motor, when the motor stator temperature is < Y℃ and the temperature difference between the battery inlet and outlet water is < E℃, or the running time of the waste heat utilization mode is > F min, the thermal management controller (1) controls the thermal management multi-way valve (4) to switch to the small loop circulation mode, the thermal management controller (1) reissues the pulse heating request, and the motor controller (2) controls the motor stator (3) to restart the pulse heating; where F is the preset time.

10. A method for thermal management of a motor using low-temperature pulse heating according to claim 7, characterized in that, In the battery temperature equalization mode, when the temperature difference before and after battery heating is < D℃, the thermal management controller (1) switches the thermal management multi-way valve (4) to small loop circulation mode and sends a pulse heating request to the motor controller (2). The motor controller (2) controls the motor stator (3) to restart the pulse heating; where D is the preset temperature.

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