Abstract: Based on requirements of close to reality and fully consider the design, the thermal simulation model of lithium battery developed towards refinement continuously to cover various key special characteristics. However, the refined modeling of battery cells inevitably means huge computer calculation. If the battery cells divided by the refined grid are simply copied and enlarged to the module and system levels, the existing numerical calculation technical conditions is difficult to meet the needs of computer calculation. Based on the simplified model of the battery cell model, a thermal simulation model of the ternary high specific energy battery module was established and the corresponding transient calculation program was developed. The results showed that the amount of calculation was greatly reduced and it is in good agreement with the measured value, which verified the speed and effectiveness of the thermal simulation method for ternary high specific energy battery module.

Key words: fire protection, ternary lithium battery, battery cell, finite element, thermal simulation