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Control Method of Battery Temperature during Quick-Charging

IP.com Disclosure Number: IPCOM000014492D
Original Publication Date: 2000-Oct-01
Included in the Prior Art Database: 2003-Jun-19

Publishing Venue

IBM

Abstract

Disclosed is a method of thermal control to reduce the battery temperature rise during quick charging. This method would be applied to a NiMH battery, a Li-Ion battery and any other batteries. The battery temperature rises as the charging current increases. This battery temperature annoys the user because the user feels uncomfortable by the heat of the battery being charged. The present method eliminates this situation by stopping charging battery at the MaxT as shown (Fig.1). This method consists of 3 control parameters, (a) MaxT which means the maximum temperature to stop charging battery, (b) MinT which means the minimum temperature to start charging battery, and (c) dT/dt which means temperature rise per a certain duration of time. MaxT is decided optionally and set to the EEPROM inside the battery pack. MaxT is lower than TCO(Thermal Cut Off) temperature. The purpose of MaxT is to avoid heating human body, such as fingers or laptop, by battery temperature rise. MinT is lower than MaxT. There is a hysteresis, temperature delta, between MaxT and MinT to stop/start charging battery.