I think that's inherent in the definition of a chemical battery. Sustaining an electrical charge difference across the poles of the cell by undergoing a chemic

I think that's inherent in the definition of a chemical battery. Sustaining an electrical charge difference across the poles of the cell by undergoing a chemical reaction. For the common NMC batteries used in cars, I think the other metals start as oxides, which get reduced to oxidise the lithium. In any case, I doubt that an inert atmosphere would help much. A better approach might be to have high-capacity water pipes pre-plumbed to allow flood cooling of the affected cars. Possibly from underneath.