Metis Engineering founder Joe Holdwarth got his start working on nuclear submarines. Today, he spends his days and nights finding ways to prevent thermal runaway events in electric cars. EV battery fires are rare. According to experts, fires occur just 5 times for every billion miles traveled. For internal combustion engine-powered vehicles, the number is 55. But when there is a thermal runaway event, the results can be catastrophic. A fire in one battery cell spreads quickly to hundreds of others. And because fires are fueled by chemicals, they are difficult to bring under control. Often firefighters can only let fires burn themselves out. Automakers, battery manufacturers and expert engineering companies worldwide are working to develop early warning systems that shut down the battery before a fire can begin. One such company is Metis Engineering based in Bristol, England. What is venting? And how do the sensors developed by Metis act as life-saving early warning systems?

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