VCT Protection IC for Li-Ion Battery
This paper proposes a VCT (Voltage, Current, and Temperature) protection IC for the Li-Ion battery cell 18650. By using the VCT protection IC, the BMS (Battery Management System) can be miniaturized into a SOC (System-on-a-Chip) to reduce the system size in the future. The proposed design is implemented using TSMC 0.25 um BCD HV G2 process. The over voltage and under voltage limits are simulated to be 4.1986 and 2.5037 V, respectively. The over temperature and under temperature limits are simulated to be 0.26383 and 44.849 °C, respectively. Besides, the charging current is detected linearly and the gain is 0.6610 (V/A) for the maximum charging current of 2.9997 A.
KeywordsLi-Ion Battery Protection Battery management system BMS
This research was partially supported by National Science Council under grant NSC 101-2632-E-230-001-MY3, as well as Cheng Shiu University under grant CS-2-102-023 (B1) and CS-B2-101-292. Besides, the authors would like to express their deepest gratefulness to CIC (Chip Implementation Center) of NARL (National Applied Research Laboratories), Taiwan, for their thoughtful chip fabrication service.
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