Research Status of Heat Dissipation Technology for Electric Vehicle Drive Motors
Authors: Xie Xuedong , Yang Yongqi , Han Lu , Yan Farui , Xie Baocheng 
Published: March 2024

Background:
The application of electric vehicles in daily life is becoming increasingly
widespread. However, the heat dissipation issues of the electric motors directly impact electric vehicles'
stability and safety. Thus, research on the heat dissipation of the electric motor is conducive to
improving the reliability of the drive motor and ensuring the overall stability and safety of electric
vehicles; there is a growing emphasis on the development trends of heat dissipation technologies for
electric vehicle drive motors.

Objective:
In order to meet the increasing requirements of electric vehicles for stability and safety
and to solve the problems of low heat dissipation efficiency of electric vehicle drive motors, the size
of heat dissipation devices, and the short life span caused by the high temperature of drive motors,
the heat dissipation of drive motors is optimized and the heat dissipation structure is improved.

Methods:
Based on the structural characteristics of heat dissipation of electric vehicle drive motors,
various representative patents related to the current heat dissipation technology of electric vehicle
drive motors are summarized.

Results:
By summarizing a large number of patents on electric vehicle drive motor heat dissipation
technology, it is concluded that the current research on electric vehicle drive motor heat dissipation
mainly focuses on liquid heat dissipation or gas heat dissipation and that the main reason for the heat
dissipation problem of electric vehicle drive motors is the low heat dissipation efficiency due to
over-reliance on a single heat dissipation method, and the reliability is poor due to failure to reasonably
control heat dissipation according to the need for heat dissipation. This paper proposes a new
idea of heat dissipation for electric vehicle drive motors, which effectively combines liquid heat dissipation
and gas heat dissipation. Moreover, the heat dissipation efficiency will be significantly higher
than the existing heat dissipation scheme, and the proposed heat dissipation concept of "ondemand
distribution" will effectively improve the utilization rate of the heat dissipation medium and
reduce the heat dissipation cost and the reasonable heat dissipation structure will reduce the volume
of the heat dissipation device. The reasonable heat dissipation structure will also reduce the volume
of the heat dissipation device. In addition, the future development of heat dissipation technology for
electric vehicle drive motors is also discussed.

Conclusion:
The heat dissipation scheme proposed in this paper will effectively improve the heat
dissipation problem of electric vehicle drive motors. Compared with the existing heat dissipation
methods, the heat dissipation efficiency of the heat dissipation scheme proposed in this paper will be
improved by more than 8.5%, and the service life of the drive motor will be extended by more than
5.1%, while the size of the electric vehicle drive motor will be reduced by 6%. More related patents
will be invented in the future.