(CNN)Automakers seeking to forge ahead in the electric vehicle market have been hitting a bump in the road recently: batteries keep catching fire.
At the end of September, BMW initiated a recall in the United States of 10 different BMW and Mini plug-in hybrid models because of a risk of fire caused by debris that may have gotten into battery cells during manufacturing. Then, in early October, the National Highway Traffic Safety Administration opened an investigation into reports of apparently spontaneous battery fires in Chevrolet Bolt EVs. GM says it is cooperating with the investigation.