Lithium-Ion Battery Thermal Management
Lithium-Ion Battery (Li-B) 18650 cells have a slight chance of spontaneously shorting, which heats the interior gradually to 130°C where the “separator” film melts. This triggers an explosive release of electric energy where the end cap ruptures, a flare emerges briefly (~1s), and then the cell materials combust for up to one minute, releasing heat and driving the cell T > 500°C. Neighboring cells can also be heated above the critical 130°C potentially causing them to short with the same consequences resulting in thermal runaway. There is a need for an effective passive solution suitable for a variety of batteries ranging in size from 10 to 4000 cells.
KULR has developed a thermal runaway shield (TRS) to prevent thermal runaway in neighboring cells by keeping the temperature below 100°C. When thermal runaway occurs in a single cell, the TRS absorbs the heat and prevents adjacent cells from getting too hot and subsequently entering thermal runaway. The system is lightweight, cost effective, and also contains a flame arrestor to block the fire from reaching surrounding cells.