China's Jinjiang Group is in the spotlight after Brazil's labour authorities said workers at a factory it is building for electric vehicle maker BYD were victims of human trafficking working in "slavery-like conditions".

Brazil has stopped issuing temporary work visas for BYD, the Brazilian Ministry of Foreign Affairs said on Friday, in the wake of accusations that some workers at a site owned by the Chinese electric vehicle producer had been victims of human trafficking.

BYD has been building the factory with an annual capacity of producing 150,000 cars initially in Brazil, the Chinese EV giant's largest overseas market, as part of plans to start production there.