Tesla Motors Inc. is offering the proprietary technology at the heart of its Model S electric car to any company that wants to build vehicles, and its chief suggested BMW AG already is interested in sharing certain patents.

Chief Executive Elon Musk said in an interview on Thursday the offer is intended to help spur wider development of electric vehicles. Mr. Musk said one topic discussed with BMW executives was sharing Tesla’s technology for rapidly recharging batteries, part of the company’s “supercharger” stations.

The Palo Alto, Calif., maker of $71,000 and up luxury electric cars decided to offer open access to Tesla patents out of frustration that electric vehicles remain less than 1% of new cars and light trucks sold each year.

BMW couldn’t be reached for immediate comment.

Mr. Musk also hinted at another reason for the offer: achieving greater economies of scale. For example, Tesla’s patents for its vehicle Supercharging stations could be shared with other auto makers, which could help Tesla spread costs and more quickly make more stations available.

More manufacturers should use small battery cells, as Tesla does, Mr. Musk said. “That would be one thing I would recommend.” He has outlined plans to build a large battery factory, which […]

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