Development of a Card-Type Storage Battery System to Prevent Fire and Safety Accidents in Storage Batteries for Railway Signal Communication

Thermal runaway is the representative cause of lithium-based storage batteries currently operating in Korea's railway electricity sector, and a battery module pack with a battery cell surface temperature detection function suggested as an effective variable that can detect thermal runaway abnormalities of lithium batteries in advance and a card-type battery-type product that can prevent safety accidents caused by heavy object drop accidents were developed and compared. Existing products have a single mechanism that operates the protection circuit at 75°C by detecting only the temperature inside the battery module. This development was carried out in a two-stage temperature monitoring method of module pack and cell unit sensing. In addition, an alarm is generated when the temperature is 55°C so that users can recognize and safely respond to dangerous situations before a fire accident and before reaching 65°C, the recommended maximum temperature for safety standards.