BES Series Battery Safety Electrolyte Sensor

Honeywell battery safety electrolyte sensors (BES) are automotive-grade sensors designed for early detection of venting and thermal runaway in battery systems. Utilizing an advanced and patented rate-of-change algorithm, the BES detects battery electrolyte vapor commonly released during the initial venting phase called first vent, as well as hydrogen and carbon monoxide gases released during a thermal runaway event.

The ability to detect the first vent provides an essential early warning for potential thermal runaway incidents in lithium-ion battery packs. This proactive early detection facilitates timely and appropriate mitigation measures, significantly reducing the risk of thermal runaway. BES employs a patented advanced rate-of-change algorithm designed to identify significant changes in the concentration of target gases within a sealed battery pack. This innovative method effectively reduces the occurrence of false negatives that may be seen with conventional ppm-based sensors, which focus on precise target gas threshold monitoring. The algorithm is tuned to prevent false positives, improving the end-user experience. Furthermore, the algorithm is supported by more than twelve years of rigorous research and validated through seven years of practical field deployment.