ScholarWorks@경상국립대학교

초록

This paper analyzes the effect of current variation in the CC (Constant Current) section in the CCCV (Constant Current and Constant Voltage) charging method on the reliability of the battery charging circuit. First, a charging simulation is performed with three current conditions of 1C, 0.75C, and 0.5C to analyze the time variation in the CC and CV sections. Next, the effect of the change in current amount and operating time on the failure rate and reliability of the charging circuit is analyzed. As a result, the smaller the charging current in the CC section, the longer the CC section, and the longer the total charging time. In particular, the points at which the reliability decreases below 0.35 are 9.1 years (1C), 7.6 years (0.75C), and 18.5 years (0.5C), respectively, confirming that the low charging current in the CC section does not always guarantee high reliability. In other words, to secure the charging circuit's reliability, the charging current in the CC section and the interaction of the duration of the CC section should be considered together.

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