Simulation Investigation on Thermal Characteristics of Thermal Battery Activation Process Based on COMSOL

Current thermal simulation methods are not suitable for small-size fast-activation batteries, so this paper provides an improved method to calculate cell temperature changes using the COMSOL platform. A two-dimensional axisymmetric model of batteries has been established, considering actual heat release situation and mobile source batteries. Based on it, change electrolyte melting under high-temperature conditions (50 °C) have simulated, in which law, characteristics, characteristics analyzed depth. The results show that additional heating flakes insulation design above below stack can effectively reduce loss. Most flows from negative side. In addition, battery activation time calculated be 91.2 ms at moment when all sheets begin melt, absolute error was within 10% compared with experimental results, indicating high accuracy broaden area