Establishment of transition point in operating mode for Constant Current Constant Voltage (CC-CV) charging of Li-ion batteries

Amit Kumar De Amit Kumar De,Shobhana Dey Shobhana Dey

doi:10.30574/wjaets.2021.3.1.0053

Amit Kumar De Amit Kumar De, Shobhana Dey Shobhana Dey

Open Access

https://doi.org/10.30574/wjaets.2021.3.1.0053

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Abstract

The present-day Li-ion batteries when operated, needs precise monitoring of the charging voltage. Several charging techniques have been tested so far with varying degrees of success. One of the most widely used charging techniques is the CC-CV (constant current constant voltage) charging. When performing this, the safety considerations must be maintained with respect to over voltage charging which is a very common problem during constant current charging. In order to prevent over voltage charging, the charging mode must be then shifted from CC to CV mode. So, this transition point of the charging mode from CC to CV is very crucial for the safe operation and health of the battery in the long run. The problem is that, this transition point doesn’t remain the same for the battery. So, in this paper the factors on which it depends are discussed and a Li-ion battery was charged in a few different charging rates using the CC-CV technique to demonstrate the process.

Highlights

The present-day technologies regarding Lithium-ion batteries have enabled them to find greater applications in our daily lives
The safety considerations must be maintained with respect to over voltage charging which is a very common problem during constant current charging
In order to prevent over voltage charging, the charging mode must be shifted from CC to CV mode

Summary

Introduction

The present-day technologies regarding Lithium-ion batteries have enabled them to find greater applications in our daily lives. As it grows in size with respect to its user base, more and more shortcomings of the technology used to handle them, crops up. This is evident from the multiple reports of Lithium-ion battery explosions in cell phones etc, which highlight the need for a safer battery charging system. Lithium-ion batteries as we know are very sensitive to the charging voltage and current [4, 5]. It needs to be monitored both during charging as well discharging. As the battery voltage gradually goes up, the charging voltage should not exceed 4.2V for prolonged periods of time in case of a standard Lithium-ion battery [5, 6]

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