What battery was used in the explosion of electric vehicles in Yadea?

I am an after-sales service person in Yadea, and I am also shocked by this incident. Generally, there are two kinds of special batteries in Yadea, Tianneng and Wei Chao, and the largest one is 48V20A, which is so powerful. Yadea Automobile has always been favored by customers, and we hope the relevant departments will make a good investigation on this matter. thank you