A method for driving a motor to actively heat a battery pack and a new energy vehicle

Abstract

The invention discloses a method for driving a motor to actively heat a battery pack and a new energy vehicle, wherein the method includes: receiving a torque command, obtaining a system loss coefficient according to the torque command and the real-time rotational speed of the drive motor, and passing the standard according to the torque command The vector control table obtains the standard current command; obtains the standard heating power according to the system loss coefficient and the standard current command; judges whether the required heating power of the heating battery pack is greater than the standard heating power, and if so, determines the actual current command according to the required heating power; if not, Then the standard current command is the actual current command; then the actual current command is used to drive the drive motor to run, and the heat generated by the drive motor is used to heat the battery pack through the heat exchange system. The above technical solution can realize the heating of the battery pack only through the improvement of the driving motor control algorithm without setting hardware, and the heating cost is low and the efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of motor drive, and in particular relates to a method for driving a motor to actively heat a battery pack and a new energy vehicle. Background technique [0002] In my country, the new energy vehicle industry has been strongly supported by the state, and new energy vehicles are becoming more and more common in daily life. From a global perspective, new energy vehicles have become the development trend of the future automotive industry. At present, the power energy of new energy vehicles mainly comes from lithium batteries or ternary batteries. The charging and discharging performance of the battery pack directly has a great impact on the power performance and cruising range of the vehicle. However, experiments have shown that the charge and discharge capacity at -20°C is about 75% of the maximum charge and discharge capacity at room temperature at 25°C. It can be seen that the charge and discharge performanc...

AI Technical Summary

Problems solved by technology

[0003] There are two main heating methods at present, one is to heat the battery itself, such as CN111883879A; however, the self-heating of the battery needs to change the structure of the battery itself, which is difficult to realize on the vehicle; The locked-rotor current is unbalanced, resulting in uneven heating of the motor body, which is prone to overheating. At the same time, the heating under locked-rotor will cause the vehicle to fail to run, affecting normal driving needs

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