Control method for active efficiency-reducing heating of novel dual-motor vehicle

Abstract

The invention relates to the field of pure electric vehicle control, in particular to a control method for active efficiency-reducing heating of a novel dual-motor vehicle, which comprises the following steps: detecting the temperature of a battery cell, comparing the temperature with a plurality of temperature thresholds, judging the relationship between the temperature of the battery cell and each temperature interval, and controlling the temperature of the battery cell on the premise of not influencing the normal driving of motors. Along with the rise of the battery temperature, the power of active efficiency-reducing heating is increased, so that the temperature rise speed of the battery is accelerated, and the problem that the whole vehicle performance is limited due to the fact that the current vehicle battery cannot be rapidly heated is solved.

Description

Technical Field

[0001] The present invention relates to the field of pure electric vehicle control, and particularly to a control method for active derating heating of a new type of dual-motor vehicle. Background Art

[0002] In the field of new energy vehicles, when the power battery operates in a low-temperature environment, its performance is significantly affected by temperature factors. Among them, the negative impacts of low temperature on the charging and discharging power of the battery and the battery life are particularly prominent. Currently, in solving the problem of low battery temperature, in addition to optimizing battery materials, mainly battery heating methods are used to meet the performance requirements of the battery in a low-temperature environment and ensure the stable operation of new energy vehicles.

[0003] As a commonly used battery heating technical solution, the active derating heating function can convert part of the electrical energy into heat energy by reducing the efficiency of converting electrical energy into kinetic energy without reducing the motor output torque, so as to achieve efficient heating of the battery. This process not only helps to maintain the activity of battery materials, effectively alleviates the deterioration of battery performance in a low-temperature environment, but also significantly reduces the negative impact of low temperature on the performance of the whole vehicle. The advantage of this function is that it can quickly increase the temperature of the battery while ensuring the normal operation of the drive motor, providing a strong guarantee for the stable operation of new energy vehicles in a low-temperature environment.

[0004] However, the existing active derating heating function adopts a constant power heating method, which is difficult to meet the requirements of complex and variable working conditions and has the following problems:

[0005] ① Long heating time: When the ambient temperature is extremely low, more heat is required to raise the battery temperature to an appropriate range. However, constant power heating cannot automatically adjust the heating power according to the temperature difference between the ambient temperature and the appropriate battery temperature, which makes the heating process time-consuming and unable to meet the rapid heating demand. In addition, due to the different initial temperatures and state of charge of the battery, the heating requirements are also different. If the initial temperature of the battery is low and the power is small, constant power heating cannot specifically increase the heating power, making it difficult to quickly raise the battery temperature, resulting in a heating time longer than the actual required time, thus affecting the use efficiency of the vehicle.

[0006] ② Limited charging power: Under low-temperature conditions, the charging acceptance ability of the battery itself decreases. And constant power heating cannot quickly and effectively raise the battery temperature, resulting in the battery being in a low-temperature state for a long time, and the chemical reaction rate inside the battery is difficult to effectively increase, greatly limiting the charging power. Usually, when constant power heating is used in a low-temperature environment, the charging power of the battery can only reach 40% - 60% of that at normal temperature, unable to meet the rapid charging demand and prolonging the charging time.

[0007] ③Insufficient optimization of vehicle performance in low-temperature environment: During vehicle operation, especially under conditions such as low-temperature startup and acceleration, the battery needs to quickly provide a large current to meet the power demand of the motor. However, heating at a constant power cannot rapidly increase the battery temperature, resulting in limited battery output power, which in turn affects the vehicle's acceleration performance and climbing ability. For example, during low-temperature startup, the vehicle's acceleration time may be extended by 2-3 seconds compared to normal temperature, and the power performance during climbing will also be significantly weakened, seriously affecting the vehicle's driving performance and user experience in a low-temperature environment.

[0008] Therefore, how to accurately and timely switch the active derating heating power under different battery operating conditions to rapidly increase the battery temperature has always been an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0009] The object of the present invention is to provide a control method for active derating heating of a new type of dual-motor vehicle in view of the deficiencies of the corresponding prior art. By setting multiple temperature ranges, detecting the average core temperature of the battery cells and comparing it with multiple temperature thresholds to determine the relationship between the average core temperature of the battery cells and each temperature range, and increasing the power of active derating heating as the battery temperature rises without affecting the normal driving of the motor, the battery temperature can be increased more quickly, thereby solving the problem that the current vehicle battery cannot be quickly heated, resulting in limited vehicle performance.

[0010] The object of the present invention is achieved by the following solution:

[0011] A control method for active derating heating of a new type of dual-motor vehicle includes the following steps:

[0012] 1) After the vehicle goes on high voltage at low temperature, the VCU reads the current average core temperature T of the battery cells, the maximum discharge power P of the battery at this average core temperature T 放max , the motor drive request power, and the maximum allowable derating heating power of the motor in real time;

[0013] 2) Set multiple temperature thresholds to form different battery cell temperature ranges, and control the dual-motor drive and start the motor for active derating heating according to the relationship between the average core temperature T of the battery cells and different battery cell temperature ranges.

[0014] Preferably, in step 2), the specific method of controlling the dual-motor drive and starting the motor for active derating heating according to the relationship between the average core temperature T of the battery cells and different battery cell temperature ranges is as follows:

[0015] 2-1) When the average core temperature T of the battery cells < the first temperature threshold T1, the VCU requests the first motor to drive, and actively derates and heats the battery with the derating heating power P 总1 ;

[0016] 2-2) When the first temperature threshold T1 ≤ the average core temperature T of the battery cell < the second temperature threshold T2, the VCU requests the first motor drive and enables the first motor to reduce the heating power P 总2 Conduct active derating heating on the battery;

[0017] 2-3) When the second temperature threshold T2 ≤ the average core temperature T of the battery cell < the third temperature threshold T3, the VCU requests the first and second motor drives and enables the first motor to reduce the heating power P 总3 Conduct active derating heating on the battery;

[0018] 2-4) When the third temperature threshold T3 ≤ the average core temperature T of the battery cell < the fourth temperature threshold T4, the VCU requests the first and second motor drives and enables the first and second motors to reduce the heating power P 总4 Conduct active derating heating on the battery;

[0019] 2-5) When the fourth temperature threshold T4 ≤ the average core temperature T of the battery cell < the fifth temperature threshold T5, the VCU requests the first and second motor drives and enables the first and second motors to reduce the heating power P 总5 Conduct active derating heating on the battery;

[0020] 2-6) When the average core temperature T of the battery cell ≥ the fifth temperature threshold T5, the system exits the active derating heating function.

[0021] Preferably, in step 2-1), when the average core temperature T of the battery cell < the first temperature threshold T1, make the active derating heating power P 总1 = 0.

[0022] Preferably, in step 2-2), when the first temperature threshold T1 ≤ the average core temperature T of the battery cell < the second temperature threshold T2, make the active derating heating power P 总2 = P 放max - P 驱1 .

[0023] Preferably, in step 2-3), when the second temperature threshold T2 ≤ the average core temperature T of the battery cell < the third temperature threshold T3, make the active derating heating power P 总3 = P 降1max .

[0024] Preferably, in step 2-4), when the third temperature threshold T3 ≤ the average core temperature T of the battery cell < the fourth temperature threshold T4, make the active derating heating power P 总4 = P 放max - P 驱1 - P 驱2 .

[0025] Preferably, in step 2-5), when the fourth temperature threshold T4 ≤ the average core temperature T of the battery cell < T5, the fifth temperature threshold, the active derating heating power P is made 总5 = P 降1max + P 降2max .

[0026] The present invention has the following beneficial effects:

[0027] A control method for active derating heating of a new type of dual-motor vehicle includes the following steps:

[0028] 1) After the vehicle goes from low temperature to high voltage, the VCU reads the current average core temperature T of the battery cell, the maximum discharge power P of the battery at the average core temperature T of the battery cell 放max , the motor drive request power, and the maximum allowable derating heating power of the motor in real time;

[0029] 2) Set multiple temperature thresholds to form different battery cell temperature ranges, and control the dual-motor drive and control the motor to start active derating heating according to the relationship between the average core temperature T of the battery cell and different battery cell temperature ranges.

[0030] The present invention detects the average core temperature T of the battery cell in real time after the vehicle goes from low temperature to high voltage, and compares the average core temperature T of the battery cell with a preset temperature threshold to determine the temperature range in which the average core temperature T of the battery cell is located. As the real-time temperature of the battery continues to rise, the system will reasonably allocate the power of the dual motors, so that on the premise of ensuring that the normal driving requirements of the vehicle are met, the battery is derated and heated with the maximum power, thereby realizing an optimal power allocation scheme and effectively improving the performance and safety of the battery in a low-temperature environment.

[0031] Preferably, in step 2), the specific method of controlling the dual-motor drive and controlling the motor to start active derating heating according to the relationship between the average core temperature T of the battery cell and different battery cell temperature ranges is as follows:

[0032] 2-1) When the average core temperature T of the battery cell < the first temperature threshold T1, the VCU requests the first motor drive and actively derates and heats the battery with the derating heating power P 总1 ;

[0033] 2-2) When the first temperature threshold T1 ≤ the average core temperature T of the battery cell < the second temperature threshold T2, the VCU requests the first motor drive and enables the first motor to actively derate and heat the battery with the derating heating power P 总2 ;

[0034] 2-3) When the second temperature threshold T2 ≤ average core temperature T of the battery cell < the third temperature threshold T3, the VCU requests the first motor and the second motor to drive, and enables the first motor to reduce the heating power P 总3 to actively reduce the heating efficiency of the battery;

[0035] 2-4) When the third temperature threshold T3 ≤ average core temperature T of the battery cell < the fourth temperature threshold T4, the VCU requests the first motor and the second motor to drive, and enables the first motor and the second motor to reduce the heating power P 总4 to actively reduce the heating efficiency of the battery;

[0036] 2-5) When the fourth temperature threshold T4 ≤ average core temperature T of the battery cell < the fifth temperature threshold T5, the VCU requests the first motor and the second motor to drive, and enables the first motor and the second motor to reduce the heating power P 总5 to actively reduce the heating efficiency of the battery;

[0037] 2-6) When the average core temperature T of the battery cell ≥ the fifth temperature threshold T5, the system exits the active reduced-efficiency heating function.

[0038] The present invention is directed to the active reduced-efficiency heating of the battery of a dual-drive vehicle. Its active reduced-efficiency heating power continuously increases as the battery temperature curve rises, and on the premise of meeting the driving performance of the vehicle, the battery is heated with the current maximum reduced-efficiency heating power as much as possible, effectively increasing the speed of the battery temperature rise.

[0039] Preferably, in step 2-1), when the average core temperature T of the battery cell < the first temperature threshold T1, the active reduced-efficiency heating power P 总1 = 0.

[0040] Preferably, in step 2-2), when the first temperature threshold T1 ≤ average core temperature T of the battery cell < the second temperature threshold T2, the active reduced-efficiency heating power P 总2 = P 放max - P 驱1 .

[0041] Preferably, in step 2-3), when the second temperature threshold T2 ≤ average core temperature T of the battery cell < the third temperature threshold T3, the active reduced-efficiency heating power P 总3 = P 降1max .

[0042] Preferably, in step 2-4), when the third temperature threshold T3 ≤ average core temperature T of the battery cell < the fourth temperature threshold T4, the active reduced-efficiency heating power P 总4 = P 放max - P 驱1 - P 驱2 .

[0043] Preferably, in step 2-5), when the fourth temperature threshold T4 ≤ the average core temperature T of the battery cell < the fifth temperature threshold T5, the active derating heating power P 总5 = P 降1max + P 降2max .

[0044] In the present invention, in different temperature ranges, according to the differential active derating heating power formula, the active derating heating power is accurately regulated, which can closely meet the actual application requirements, realize the fine adjustment of the heating power, and make the distribution of the active derating heating power of the two motors to the battery more reasonable.

[0045] Glossary of terms:

[0046] Vehicle low-temperature high-voltage power-on: It refers to the operation process of starting the high-voltage power supply system when the vehicle has been parked in a low temperature for a long time and is about to start driving, or when the high-voltage system has not been used for some time in a low-temperature environment. Brief description of the drawings

[0047] Figure 1 is a flowchart of the present invention. Detailed implementation manners

[0048] As Figure 1 shown, a control method for active derating heating of a new dual-motor vehicle includes the following steps:

[0049] 1) The dual-motor electronic control system is a front and rear wheel dual-drive motor drive device. After the vehicle powers on at low temperature and goes high-voltage, the VCU reads the current average core temperature T of the battery cell, the maximum discharge power P 放max of the battery at the average core temperature T of the battery cell, the motor drive request power, and the maximum allowable derating heating power of the motor;

[0050] Specifically, inside the battery, multiple battery cells are usually configured. The BMS (Battery Management System) monitors the core temperature of each battery cell in real time. The BMS performs internal balancing processing on the core temperatures of multiple battery cells and finally outputs an average core temperature T of the battery cell that can represent the overall temperature state of the battery.

[0051] Under low-temperature conditions, significant changes occur in the physical and chemical processes inside the battery. Since low temperature inhibits the ion migration and chemical reactions inside the battery, the discharge power is greatly limited. As the battery temperature gradually increases, the chemical reaction activity inside the battery increases, resulting in an increase in the discharge power of the battery. It can be seen that the average core temperature T of the battery cell and the maximum discharge power P 放maxThere is a close correlation between them. Any change in the average core temperature T of the battery cell will inevitably cause a corresponding change in the maximum discharge power P of the battery. 放max A corresponding change will occur.

[0052] In this embodiment, the motor drive request power and the maximum allowable derating heating power of the motor are determined according to the corresponding motor model parameters.

[0053] 2) Set multiple temperature thresholds to form different battery cell temperature ranges, and control the dual-motor drive and the specific method of controlling the motor to start active derating heating according to the relationship between the average core temperature T of the battery cell and different battery cell temperature ranges as follows:

[0054] 2-1) When the average core temperature T of the battery cell < the first temperature threshold T1, the VCU requests the first motor drive and actively derates and heats the battery with the derating heating power P. 总1 When the average core temperature T of the battery cell < the first temperature threshold T1, the maximum discharge power P of the battery 放max < the first motor drive request power P 驱1 (i.e., P 放max < P 驱1 ).

[0055] Since the battery discharge power at this time cannot meet the first motor drive request power, in order to ensure the normal operation of the vehicle, the VCU preferentially meets the first motor drive demand and does not perform the active derating heating function through the first motor, that is, the derating heating power P 总1 = 0.

[0056] It should be noted that the second motor is not started at this time because P 放max < P 驱1 , that is, the battery discharge power is limited and can only drive the first motor.

[0057] In this embodiment, the multiple temperature thresholds are empirical values, usually obtained through preliminary calibration tests. And through the battery low-temperature experiment, the battery discharge power of this battery at different temperatures can be determined. Therefore, the relationship between the maximum discharge power of the battery, the motor drive request power, and the maximum allowable derating heating power of the motor in different temperature ranges can be obtained.

[0058] In this embodiment, a voltage threshold and a temperature judgment threshold are also set, which are used to determine whether the vehicle is in the low-temperature high-voltage working condition before step 1) is executed. The bus voltage value of the controller and the average temperature of the battery cells in the battery are detected by sensors, and the detected bus voltage value of the controller is compared with the voltage threshold, and at the same time, the average temperature of the battery cells in the battery is compared with the temperature judgment threshold. If both conditions of the bus voltage value of the controller > the voltage threshold and the average temperature of the battery cells < the temperature judgment threshold are satisfied, it is determined that the vehicle is in the low-temperature high-voltage state. If the above conditions are not satisfied, it is determined that the vehicle is not in the low-temperature high-voltage state. The above voltage threshold is the voltage value required for the normal operation of the controller, and the temperature judgment threshold is the temperature condition that does not affect the battery performance. The above voltage threshold and temperature judgment threshold are empirical values and are obtained through calibration tests.

[0059] 2-2) When the first temperature threshold T1 ≤ the average temperature T of the battery cells < the second temperature threshold T2, the VCU requests the first motor drive and enables the first motor to reduce the heating power P 总2 Perform active derating heating on the battery.

[0060] When the first temperature threshold T1 ≤ the average temperature T of the battery cells < the second temperature threshold T2, the requested power P of the first motor drive 驱1 ≤ the maximum discharge power P of the battery 放max < the maximum allowable derating heating power P of the first motor 降1max + the requested power P of the first motor drive 驱1 (that is, P 驱1 ≤ P 放max < P 降1max + P 驱1 ). Since the battery discharge power at this temperature can meet the requested power P of the first motor drive 驱1 , and there is surplus power (that is, the surplus power at this time is P 放max -P 驱1 ), so while meeting the first motor drive demand, the VCU enables the first motor to perform the active derating function, that is, the derating heating power P 总2 =P 降1 =P 放max -P 驱1 .

[0061] 2-3) When the second temperature threshold T2 ≤ the average temperature T of the battery cells < the third temperature threshold T3, the VCU requests the first motor and the second motor drive, and enables the first motor to reduce the heating power P 总3 Perform active derating heating on the battery.

[0062] When the second temperature threshold T2 ≤ the average temperature T of the battery cells < the third temperature threshold T3, the maximum allowable derating heating power P of the first motor降1max + First motor drive requested power P 驱1 ≤ Battery maximum discharge power P 放max < First motor allowed maximum derating heating power P 降1max + First motor drive requested power P 驱1 + Second motor drive requested power P 驱2 (i.e., P 降1max + P 驱1 ≤ P 放max < P 降1max + P 驱1 + P 驱2 ). At this temperature, when the battery maximum discharge power can meet the first motor drive demand and the first motor allowed maximum derating heating power, there is still remaining battery discharge power. Therefore, the VCU requests the first motor and the second motor to drive simultaneously, and activates the active derating function of the first motor to heat the first drive motor at the allowed maximum derating power, i.e., the derating heating power P 总3 = P 降1max (P 降1 = P 降1max , P 降2 = 0).

[0063] 2 - 4) When the third temperature threshold T3 ≤ average core temperature of battery cells T < fourth temperature threshold T4, the VCU requests the first motor and the second motor to drive, and activates the first motor and the second motor to actively derate and heat the battery at the derating heating power P 总4 to actively derate and heat the battery.

[0064] When the third temperature threshold T3 ≤ average core temperature of battery cells T < fourth temperature threshold T4, the first motor allowed maximum derating heating power P 降1max + First motor drive requested power P 驱1 + Second motor drive requested power P 驱2 ≤ Battery maximum discharge power P 放max < First motor allowed maximum derating heating power P 降1max + First motor drive requested power P 驱1 + Second motor drive requested power P 驱2 + Second motor allowed maximum derating heating power P 降2max (i.e., P 降1max + P 驱1 + P 驱2 ≤ P 放max < P 降1max + P 驱1 + P 驱2 + P 降2max ).

[0065] Within this temperature range (T3, T4), when the maximum discharge power of the battery can satisfy the normal driving of the first motor and the second motor, and the first motor heats at the maximum allowable derated heating power, there is still surplus power. At this time, the VCU requests dual-driving of the first motor and the second motor, and the first motor and the second motor simultaneously enable the active derated heating function. The first motor heats at the maximum derated heating power, that is, the derated heating power P 总4 = P 放max - P 驱1 - P 驱2 (i.e., P 降1 = P 降1max , P 降2 = P 放max - P 驱1 - P 驱2 - P 降1max ).

[0066] 2 - 5) When the fourth temperature threshold T4 ≤ the average core temperature T of the battery cells < the fifth temperature threshold T5, the VCU requests the first motor and the second motor to drive, and enables the first motor and the second motor to actively derate and heat the battery at the derated heating power P 总5 When the fourth temperature threshold T4 ≤ the average core temperature T of the battery cells < the fifth temperature threshold T5, the maximum discharge power P of the battery

[0067] ≥ the maximum allowable derated heating power P of the first motor 放max + the driving request power P of the first motor 降1max + the driving request power P of the second motor 驱1 + the maximum allowable derated heating power P of the second motor 降2max (i.e., P 放max ≥ P 降1max + P 驱1 + P 驱2 + P 降2max ). At this temperature, when the battery discharge power simultaneously satisfies the dual-motor driving request and the request for the maximum allowable derated heating power of the dual motors, there is still surplus power. Therefore, the VCU requests dual-driving of the first motor and the second motor, and the first motor and the second motor simultaneously heat at the maximum derated heating power, that is, the derated heating power P 总5 = P 降1max + P 降2max (i.e., P 降1 = P 降1max , P 降2 , P 降2max = P 总6 ).

[0068] 2 - 6) When the average core temperature T of the battery cell ≥ the fifth temperature threshold T5, the battery temperature is reached, the heating ends, and the system requests to exit the active derating heating function. At this time, the active derating heating power P of the system 总6 = 0.

[0069] In this embodiment, since i q and i d affect the output torque and output heating power of the motor, and the same torque can be obtained by multiple groups of i q and i d combinations, the following formula can be used

[0070]

[0071] and select the corresponding i q and i d combinations from the experimental data according to the required derating heating power and driving power, so as to meet the motor driving requirements and the active derating heating requirements. Among them, T e is the motor torque, np is the number of pole pairs, F f is the motor magnetic flux, i q is the Q - axis current, i d is the D - axis current, L d is the D - axis inductance, L q is the Q - axis current, P is the motor power, and n is the motor speed.

[0072] In this embodiment, P 总1 is the total power of active derating of the battery when the average core temperature T of the battery cell < the first temperature threshold T1; P 总2 is the total power of active derating of the battery when the first temperature threshold T1 ≤ the average core temperature T of the battery cell < the second temperature threshold T2; P 总3 is the total power of active derating of the battery when the second temperature threshold T2 ≤ the average core temperature T of the battery cell < the third temperature threshold T3; P 总4 is the total power of active derating of the battery when the third temperature threshold T3 ≤ the average core temperature T of the battery cell < the fourth temperature threshold T4; P 总5 is the total power of active derating of the battery when the fourth temperature threshold T4 ≤ the average core temperature T of the battery cell < the fifth temperature threshold T5; P 总6 is the total power of active derating of the battery when the average core temperature T of the battery cell ≥ the fifth temperature threshold T5; P 降1 is the power of the first motor actually actively derating the battery; P 降2 is the power of the second motor actually actively derating the battery.

[0073] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications made by those skilled in the art to the present invention without departing from the spirit of the present invention fall within the protection scope of the present invention.

Claims

1. A control method for active downgrade heating of a new dual-motor vehicle, characterized in that: The following steps are involved: 1) After the vehicle is low temperature and high voltage is applied, the VCU reads the current average battery cell temperature T and the maximum battery discharge power P at the average battery cell temperature T in real time. 放max , the motor drive requested power and the maximum allowed reduced efficiency heating power of the motor; 2) Setting a plurality of different temperature thresholds to form different battery cell average temperature ranges, and controlling the dual motor drive and controlling the motor to start active efficiency reduction heating according to the relationship between the battery cell average temperature T and different battery cell average temperature ranges.

2. The control method for active downgrade heating of a novel dual-motor vehicle according to claim 1, characterized in that: In step 2), according to the relationship between the average core temperature T of the battery cells and the average core temperature ranges of different battery cells, the dual motor drive is controlled and the motor is controlled to start active efficiency reduction heating, and the specific method is as follows: 2-1) When the average battery cell temperature T is less than the first temperature threshold T1, the VCU requests the first motor to drive and heat the battery at a reduced efficiency power P 总1 Actively de-energize the battery for heating; 2-2) When the first temperature threshold T1 ≤ the average battery cell temperature T < the second temperature threshold T2, the VCU requests the first motor to drive, and activates the first motor to reduce the heating power P 总2 Actively de-energize the battery for heating; 2-3) When the second temperature threshold T2 ≤ the average battery cell temperature T < the third temperature threshold T3, the VCU requests the first motor and the second motor to drive, and enables the first motor to reduce the heating power P 总3 Actively de-energize the battery for heating; 2-4) When the third temperature threshold T3 ≤ the average battery cell temperature T < the fourth temperature threshold T4, the VCU requests the first motor and the second motor to drive, and enables the first motor and the second motor to reduce the heating power P 总4 Actively de-energize the battery for heating; 2-5) When the fourth temperature threshold T4 ≤ the average battery cell temperature T < the fifth temperature threshold T5, the VCU requests the first motor and the second motor to drive, and enables the first motor and the second motor to reduce the efficiency of heating power P 总5 Actively de-energize the battery for heating; 2-6) When the average battery cell temperature T ≥ the fifth temperature threshold T5, the system exits the active reduced efficiency heating function.

3. The control method for active downgrade heating of a novel dual-motor vehicle according to claim 2 is characterized in that: In step 2-1), when the average battery cell temperature T is less than the first temperature threshold T1, the active derated heating power P is 总1 =0.

4. The control method for active downgrade heating of a novel dual-motor vehicle according to claim 2 is characterized in that: In step 2-2), when the first temperature threshold T1 ≤ the average battery cell temperature T < the second temperature threshold T2, the active derated heating power P 总2 =P 放max -P 驱1 .

5. The control method for active downgrade heating of a novel dual-motor vehicle according to claim 1, characterized in that: In step 2-3), when the second temperature threshold T2 ≤ the average battery cell temperature T < the third temperature threshold T3, the active derated heating power P 总3 =P 降1max .

6. The control method for active downgrade heating of a novel dual-motor vehicle according to claim 1, characterized in that: In step 2-4), when the third temperature threshold T3 ≤ the average battery cell temperature T < the fourth temperature threshold T4, the active derated heating power P 总4 =P 放max -P 驱1 -P 驱2 .

7. The control method for active downgrade heating of a novel dual-motor vehicle according to claim 2, characterized in that: In step 2-5), when the fourth temperature threshold T4 ≤ the average battery cell temperature T < the fifth temperature threshold T5, the active derated heating power P 总5 =P 降1max +P 降2max .

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