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Audi files 2 patent requests for fire prevention technology in EV batteries

Future electric vehicles may include a battery cell shut-off feature and an onboard extinguisher


A 2021 Audi e-tron (right) sits on display at the Denver auto show on Sept. 17, 2021. The e-tron could get Audi’s newly patented in-battery fire prevention technologies.

File photo/David Zalubowski/Associated Press

By Leila Merrill

HERNDON, Va. — Audi has filed for two U.S. patents for fire prevention features within the lithium batteries in its electric vehicles, Carbuzz reported. Audi could use the features in its Audi e-tron, its all-electric model.

When a single cell in a battery pack operates outside of its neighbors’ temperature and output ranges, it becomes a fire risk. Since the cells are connected in parallel to make up a battery, the problem can be difficult to detect in time.

A patented battery control solution can identify and isolate individual battery cells, based on information gathered by cell-mounted sensors. This system can detect whether a cell is functioning within its safe temperature- and output range, and if there is a fire risk, switch off the individual cell or cells.

The second patent functions as the next step in fire prevention.

If the cell cutoff is not sufficient and the battery control system detects a fire risk, it will flood the battery pack’s interior with a flame-extinguishing agent before a fire can start.

“If the onboard fire extinguisher runs out, a possible supplementary feed line from an external extinguisher reservoir may make it easier for firefighters to control a potential blaze,” Carbuzz reported.


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