锂离子动力电池充放电热跟踪系统设计

Design of heat tracking system for charge and discharge of lithium-ion power battery

为实现18650锂离子电池在室温下以1 C倍率充放电时产热测量的绝热环境,设计一种基于电池温度与环境温度跟随策略的锂离子动力电池充放电热跟踪系统,采用硅胶加热片对绝热温控腔体进行加热,STM32单片机和LM2596电源管理芯片搭建可调节电源实现驱动。利用Matlab对绝热箱温控系统进行模型辨识,提出一种Smith预估模糊PID算法进行控制。仿真与实验结果表明:绝热箱内电池温度与环境温度的最大跟踪误差不超过0.5℃,具有响应速度快、误差小等优点,能够满足18650锂离子电池在室温下以1 C倍率充放电时产热测量的需求。

To construct the adiabatic environment required for measuring the heat generated by charging and discharging 18650 lithium-ion power battery at 1 C times at room temperature,a lithium-ion power battery charging and discharging thermal tracking system is designed,which uses the battery temperature as the target and makes the ambient temperature follow the strategy.The system uses the STM32 microcontroller as the controller and the LM2596 power management chip as the core device of the adjustable power supply.A silica gel heating sheet to heat the adiabatic temperature control chamber is adopted.We use Matlab to identify the model of the thermal tracking system and apply Smith's prediction fuzzy PID algorithm for control.The simulation and experimental results show that the maximum tracking error between the battery temperature in the adiabatic chamber and the ambient temperature is no more than 0.5℃,which has the advantages of fast response and small error,and can meet the demand for heat generation measurement of 18650 lithium-ion batteries when they are charged and discharged at 1 C multiplier at room temperature.