Research on damaged unit detection of lithium battery thermal management system

Abstract

Currently, the electric car sector is experiencing significant growth and is widely popular among the consumers due to its utilization of clean energy and little impact on the environment. The battery of electric vehicles is a crucial constraint on the advancement of the electric vehicles, with its temperature being the primary component that greatly affects the battery’s performance. This article examines the structural parameters of lithium battery packs in order to enhance their durability. By utilizing a sample optimization method, the ideal structural parameters are determined to ensure an improved cooling effect. Subsequently, three types of battery damage were simulated using different heat generation rates. By arranging the temperature sensors and analyzing the feedback values of the sensors under three types of damaged conditions, a rule that determining the damaged location and damaged degree of a certain battery in the battery pack can be obtained by using fewer temperature sensors. Finally, by fitting the feedback values as a quadratic function, an equation accurately determining the degree of damage is obtained. The damaged unit detection scheme proposed in this article can be widely applied to improve the safety of battery systems and reduce the occurrence of hazards such as fire and explosion caused by overheating of the batteries.