Abstract: A new equalization algorithm of nonlinear PID control is proposed for the multi-cells equalization problem in the charging and discharging process of Lithium-ion battery pack. The nonlinear mapping between PID parameters and error, which is constructed by nonlinear functions, regulates the gains of PID controller according to error and has better robustness and dynamic response than traditional PID controller. Simulation results show that the proposed algorithm has high precision, rapid response and without overshoot in the energy equalization control of Lithium-ion battery pack.

Key words: battery pack control, nonlinear PID, energy equalization, Lithium-ion battery

摘要： 针对串联锂离子电池组充放电过程中的均衡问题，设计了一种新型的非线性PID均衡控算法。利用非线性函数，构造了误差与PID参数的非线性映射关系，使得PID调节器中的增益参数随控制误差而变化，比常规的线性PID调节器具有更强的鲁棒性和更好的动态响应。仿真结果表明，该算法控制精度高，速度快，能够无超调地实现锂离子电池的能量均衡。

关键词: 串联锂电池组控制, 非线性PID, 能量均衡, 锂离子电池