LAUSR

This paper presents an electrochemical-thermal coupling model of 5Ah NCA-graphite pouch battery to analyze the heat generation mechanism. The simulation result indicates that the total heat generation increases with current and the polarization heat is dominant. The total heat generation of the negative electrode is higher than that of the positive electrode, while the electrochemical reaction heat and ohmic heat of the positive electrode are higher than those of the negative electrode. Ffour design parameters were selected, and their effects on electrochemical-thermal characteristics and the heat generation from different heat sources were analyzed in detail. The results indicate that the increase of capacity and decrease of discharge temperature can be achieved by decreasing the radius of positive/negative particles (Rp/Rn) and increasing the initial electrolyte concentration (cl,0) in a reasonable range. Rp and Rn are proportional to polarization heat and ohmic heat, Rp is proportional to electrochemical reaction heat and Rn is inversely proportional. cl,0 does not affect on electrochemical reaction heat, it is proportional to ohmic heat and inversely proportional to polarization heat. The sensitivity order of the design parameters is as follows: Rp > Rn > cl,0 > SEI film resistance (Rsei).