Who sold the battery patent to BYD?

According to the inquiry of BYD Auto official website, Fudi Technology found that all BYD models include BYD Yuan, BYD Tang and BYD Qin ev300. Fudi Technology is a subsidiary of BYD Group specializing in the production of auto parts, and the patent was given to BYD Han EV's blade battery, which was produced by Fudi Technology. BYD Co., Ltd. was established in 1995.