Temperature-Compensated Overcharge Protection Measurement Technology

Abstract

Recently, many problems have been caused by battery fires. The existing BMS(Battery Managment System) measured the voltage of each cell of the battery through the physical connection between the battery and the control module. However, if a battery with up to 1000 VDC becomes inoperable due to an external factor, the battery is damaged, and accordingly, a large current of the battery breaks the control unit of the BMS with 5 VDC to 24 VDC, putting the BMS inoperable. If the battery is operated when the bms is in trouble, it poses a risk of battery fire.Recently, as bms technology was announced with a wireless function, battery information could be easily transferred from the outside, so that convenience was maximized, but stability is still weak. This paper physically separated the battery and control module by measuring the battery voltage depending on the strength of the LED by connecting the battery and LED. and furthermore, the measurement error should be less than 1 mV even when the temperature changes. In addition, it was designed to operate at a low output level of 200 μW to 360 μW using the sub-threshold section of the LED.