BYD, partly owned by Warren Buffet, has injected around five billion yuan (about 731.5 million US dollars) into the operation of the Huizhou plant, which produces rechargeable batteries, automobile parts and handset components, the newspaper said.
Facilities for the production of batteries for the company's electric cars are almost ready now, since construction began in September last year, the newspaper said.
The Shenzhen-based company's F3DM, China's first plug-in hybrid, made its debut last December.
Huizhou plant, the first eligible for mass production of lithium-ion batteries that are core technologies of BYD's electric cars, is seen as a key step in the company's electric car manufacturing.
The Wall Street Journal said that the company is aiming to sell its all-electric battery car in the U.S. next year, ahead of the original schedule, citing company Chairman Wang Chuanfu in Xi'an, Shaanxi Province, during an interview at a BYD factory there.