摘要
针对串联锂电池组充放电过程电池均衡的问题,研制了基于微控制器的锂电池组均衡电路,Buck电压变换通过推挽开关电路和隔离输出电路实现。电池组工作期间利用电阻分压由微控制器对各串电压进行采样测量和比较,由整串电池组供电的开关电路通过继电器或光耦/MOS管切换对电压最低的一串电池输出,实现了充电和放电的各串电池电压均衡。针对串数较多的电池组设计了备用电池补偿的方案,它具有结构简单和高效的特点。
To solve the equalization problem of lithium battery packs in series during their charging/discharging processes, the microcontroller-based equalization circuits were developed. Buck transformation was carried out through push-pull switching circuit and isolation output. The voltage of each cell of the battery pack was sampled and compared during its working period by the resistor dividers. The battery cell with the lowest voltage was charged from the switching circuit powered by the whole battery pack via switch of the relays or optocouplers/MOSFETs. The equalization of the battery pack was achieved in charge and discharge processes. Alternatively, another scheme for equalization using a backup battery as compensation to the cell of lower capacitance was designed in the pack with more series, for the sake of simplification and higher efficiency.
出处
《电源技术》
CAS
CSCD
北大核心
2014年第9期1624-1626,1729,共4页
Chinese Journal of Power Sources
基金
广西自然科学基金(2011GXNSFA018157)
广西无线宽带通信与信号处理重点实验室开放基金项目(12108)
关键词
锂电池组
均衡
串联
充放电
切换控制
Li-ion battery pack
equalization
series connection
charge/discharge
switch control
