An evaluation methodology for the Li- Ion battery multiplexed voltage measurement systems

In modern era the utilization of battery empowered systems is growing exponentially. In the goal to achieve an optimal system performance, the employment of a BMS (Battery Management System) is inevitable. Data acquisition is an elementary operation of the BMS. Usually a battery is composed of several cells. Therefore, a multiplexed ADC (A/D Converter) is employed for acquiring each cell data. It renders an effective solution in terms of cost and power consumption. However, the multiplexing can render A/D conversion latencies. In this context a performance comparison between two multiplexed data acquisition systems, based respectively on the ΔΣ and the SAR (Successive Approximation Register) ADCs is made. The application is to measure the Li-Ion battery voltage. A measurement methodology is presented. The pros and cons of both considered systems are described with the experimental results.