Stellantis’ secret technology to stop battery fires

Stellantis could be preparing one of the most radical changes in how the auto industry handles electric car battery fires. Newly published patent documents reveal that the group, which owns brands including Fiat, Jeep, Peugeot and Ram, has developed a system capable of releasing fire-retardant foam inside the battery as soon as a serious fault is detected. The proposal aims not only to contain the fire, but also to prevent it from spreading.

The idea comes from an uncomfortable diagnosis for the sector: passive solutions, such as structural reinforcements and internal partitions between cells, help, but are not enough in the face of extreme thermal runaway events. Instead of just resisting the fire, Stellantis wants to actively fight it – and from the inside out.

According to the patent, the system uses a flexible reservoir made of polymer material, installed inside the battery. This compartment stores a chemical substance with flame retardant properties, capable of quickly turning into foam when released. The tank remains intact during normal vehicle operation, but is designed to be punctured in a controlled manner in an emergency.

Activation is carried out using an ingenious set of electronically controlled moving blades. The first blade directly pierces the foam tank as soon as sensors detect signs of short circuit, abnormal temperature increase or other anomalies…

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