Abstract
Battery management system (BMS) is a critical aspect to ensure the safe, reliable operation of lithium ion batteries for battery pack applications. Although some battery pack monitoring schemes have increased the number of measurable channels in a chip for higher voltage battery packs, the issue of accuracy caused by the common mode voltage difference in each unit of series battery pack remains unsolved. A high voltage multiplexer of 17-cell battery monitoring analog front end (AFE) is adopted to acquire each cell voltage for accurate monitoring. Besides, a current compensation scheme is proposed to tackle the current leakage in each channel to further improve the acquisition accuracy. The proposed scheme is implemented in 0.18 μm high-voltage BCD process, and occupies a die size of 2.92 × 3.23 mm2. The experimental results reveal that the sensing error of 17 battery cells is within ±2 mV under the input cell voltage from 1 to 5V.
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