基于分时复用技术的锂离子电池组均衡充电电源

A lithium ion array batteries equalizing charger based on the technology of 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。充电电源包括主控模块、快速脉冲发生模块、分时信号发生模块、恒流源模块、保护模块,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,减少了电池组特的性不一致性,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24V/24AH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 iron array batteries, a novel limiting voltage pulsed constant current equalizing charger is designed and developed, which is based on the time division multiplexing(TDM) technology. The proposed charger consists of high speed pulsed generator model, TDM signal generator model, constant current model and protection model, et al. In addition, the charger is combining with high speed analog proportional–integral–derivative(PID) feedback, which has the ability of regulating charging currents in each battery independently. In terms of software, digital discrete Ziegler–Nichols proportion-integral-derivative(PID) control algorithm is utilized, which can reduce the un-identity of battery characteristic, obtain the equalizing charging and enhance its using life much longer. Utilizing the proposed charger, a charging experiment is performed on four lithium ion batteries with the capability of 24V/24AH. The experimental results show that the stability of drive current is better than 4×10-5A, linearity of the power system is better than 99.97%, which can guarantee the quick charge of lithium iron array batteries.