Modelling and Simulation Modelling and simulation of relationship between internal cell temperature and apparent resistivity for lithium-ion battery

X B Hong, N Z Li, W W Yin, J H Feng, G X Liu

COMPUTER MODELLING & NEW TECHNOLOGIES 2015 19(1B) 85-91

College of mechanical and automotive engineering, South China University of Technology, Guangzhou, 510640 China

Safety problems caused by thermal runaway have been restricting the popularization and application of power lithium-ion battery (LIB). As Electrical Resistance Tomography (ERT) method can potentially detect the variations of internal cell apparent resistivity influenced by temperature, the simulation of the relationship between the internal cell temperature and apparent resistivity is presented to monitor the thermal circumstance inside LIB cell. Using the linear interpolation functions, the LIB model is built and meshed. The appropriate boundary conditions are imposed to simulate the cell virtual heating process and ERT process. During the simulations, the distributions of the apparent resistivity at different temperatures are given. It is found that the correlation of apparent resistivity and temperature is well fitted by quintic function. Meanwhile, the evaluation of quintic fit under cell discharge reveals a deviation of 6.2K between the cell core temperature and the surface temperatures. The presented method cannot only be applied in thermal balance management, life prediction and load control, but also afford a possible way for monitoring the health of separator structure of LIB.