PARIS, France - Nissan and BMW are keen to collaborate on electric cars after rival US automaker Tesla agreed to share its patents with competitors.The London Financial Times reported on Monday: "It is clear that everybody would benefit if there were a far more simple way to charge electric cars."Nissan, along with BMW and Tesla, account for about 80% of the world's sales of such vehicles, the newspaper said.DISCUSSION IN PROGRESS A spokesman for Germany's BMW told AFP that executives had had discussions with Telsa but declined to give further details."We do not comment on media speculation. Both companies are interested in promoting the topic of electric vehicles and contributing to the success of this technology."Nissan declined to comment. A spokesman for the group in Tokyo said it would "welcome any initiative to boost the number of electric vehicles".Tesla took the rare step of agreeing to share its patents in the hope of increasing global production of electric cars. Growth in the embryonic industry has been held back as electric cars are often more expensive than vehicles that run on fossil fuels.There is also a lack of charging stations and any industry standards for the technology.