动力电池组动态均衡时的热安全边界计算与验证

The equalization system is an effective way to solve the inconsistency of the battery system. However, excessive heat generation of the battery equalization circuit can easily cause the safety of the controller. Aiming at the thermal safety problem caused by the heat generation of the equalizing circuit, a distributed controller is taken as the research object: A thermodynamic model of the battery management system controller and the circuit board is established. The highest temperature and temperature distribution of the circuit board under different dynamic equilibrium control strategies are studied through temperature field simulation and the influence of the opening channel position on the temperature distribution of the dynamic equilibrium circuit board is analyzed. Calculate the maximum equalization working efficiency and thermal safety boundary under each working condition under the thermal safety design conditions and obtain a set of thermodynamic model establishment and thermal simulation analysis methods that can be applied to the equalization of the battery management system. The simulation and experimental results show that the model error of any sampling point is less than 4 ℃, which can intuitively and accurately simulate the temperature distribution of the dynamic equalization circuit board.