Volume 52

Analyzing the Optimal Voltage Range for Detecting Internal Short Circuits in Lithium-Ion Batteries ChiJyun Ko, KuoChing Chen

Abstract

Internal short circuit (ISC) is considered one of the main causes of battery failure, making early detection of ISC crucial for battery safety. The charging voltage curve contains abundant information about the battery state, reflecting various conditions, and is easily obtainable during the charging process. Therefore, it serves as an excellent signal for ISC detection. This research employs parallel resistor methods to simulate different leakage current scenarios and analyzes the impact of various charging voltage ranges on ISC. It identifies the optimal voltage range for detecting leakage current as 3.6 V to 3.7 V and determines that the resistance value capable of detecting the slightest ISC is 700 ohms. Furthermore, this method has been successfully applied in various environmental temperatures and series-connected battery packs, demonstrating its versatility across different scenarios.

Keywords Lithium-ion battery, Internal short circuit, Partial charging, Constant current