分时复用的锂离子组电池均衡充电电源

A lithium ion array batteries equalizing charger based on time division multiplexing

为了提高锂离子电池组的充电效率,采用分时复用技术设计并研制了一种限压脉冲恒流的新型均衡充电电源。充电电源包括控制模块、高速脉冲产生模块、分时复用信号产生模块、恒流源模块和保护电路模块,并结合高速模拟比例-积分-微分(PID)反馈,达到对每节电池充电电流的独立调节。软件设计方面,采用数字离散化的Ziegler–Nichols PID控制算法,减少了电池组特性的不一致性,达到对每节电池均衡充电,从而提高了电池组的使用寿命。利用该充电电源对四节24 V/24 Ah的锂离子电池组进行充电测试,实验表明该充电电源充电电流稳定度优于4×10-5A,线性度优于99.97%,保证了锂离子电池组快速充电。

To improve the charging efficiency of lithium-ion batteries, a novel limiting voltage pulse constant current equalizing charger was designed and developed based on time division multiplexing （TDM） technology. The proposed charger consisted of control model, high speed pulse generator model, TDM signal generator model, constant currant model and circuit protection model, et al. Combining with high speed analog proportional-integral derivative （PID） feedback, the charger independently regulated charging currents of each cell. In terms of software, digital discrete Ziegler-Nichols PID control algorithm was utilized, reducing the inconformity of battery characteristic, equalizing charging and enhancing its using life. Utilizing the proposed charger, a charging experiment was performed on four lithium-ion batteries with the capability of 24 V/24 Ah. The experimental results show that the stability of charging current is better than 4 ×10^-5A, and the linearity is better than 99.97%, which can guarantee the fast charge of lithium-ion batteries.