无人机锂电池组平衡充电技术的研究

针对无人机用锂离子串联电池组充电结束时各单元电池电压的一致性问题,对传统锂离子串联电池组充电均衡方法进行了研究,对有损均衡充电方案和无损均衡充电方案进行了归纳,分析了传统有损均衡充电方案和无损均衡充电方案的利弊,提出了一种基于DSP TMS320F28035以及光继电器开关实时选通浮地采样方案的均衡充电方法,利用实验样机对锂离子串联电池组进行了充电测试。研究结果表明:该均衡充电方案能实时监测充电电流和各单元电池电压,能够实现过压保护、过流保护、充电电流预置、放电存储模式、充电曲线预置等多项功能,充电均衡效果较好,充电结束时各单元电池间电压差不超过10 m V。

Research of balancing charging of lithium-ion battery

Aiming at battery equalization problem in the UAV(unmanned aerial vehicle), the traditional charging technique was re-searched, the loss balance charging technique and the lossless balance charging technique was analyzed, a balance charging technique based on TMS320F28035 and floating ground sampling technique was proposed, the charging test of Lithium-ion Batteries was carried on. The results indicate that the proposed charging technique can monitor the charging current and voltage, implement OVP, OCP, charging current preset, discharging storage mode and charging curve preset function, and attain better balance effect at the end of charging, the voltage difference between two batteries is lower than 10 mV.