Chinese battery manufacturer Svolt Energy is set to launch trial production of its first-generation semi-solid-state batteries in the fourth quarter of 2025, with plans to supply the 140 Ah cells to BMW’s Mini brand starting in 2027, according to Chinese media reports citing company chairman Yang Hongxin.
The semi-solid-state batteries, which use a hybrid electrolyte combining both solid and liquid elements, are expected to deliver enhanced safety and energy density compared to conventional lithium-ion cells. Svolt’s first-generation cells will offer an energy density of 300 Wh/kg in a soft-pack format, while a second-generation version aims for 360 Wh/kg, according to reporting from China Star Market.
“These batteries will be produced at very low cost and are part of our roadmap to elevate battery performance in mass-market electric vehicles,” said Svolt chairman Yang Hongxin. He added that production will leverage the company’s existing facilities for semi-solid batteries.
The cells are earmarked for BMW’s Mini lineup, with mass production set for 2027. The partnership builds on historical ties—Svolt was spun out of Great Wall Motor in 2018, and GWM currently operates a joint venture with BMW to produce the Mini Cooper Electric and Mini Aceman in China. Media speculation about a potential billion-euro battery deal between BMW and Svolt has circulated since 2023.
Svolt is also advancing its all-solid-state battery programme, targeting an energy density of 400 Wh/kg for use in electric vehicles and low-altitude aviation.
In a separate development, Svolt recently completed production of its second-generation Dragon Armor Battery at its Huzhou facility in Zhejiang province. With up to 65 kWh capacity and 5C fast-charging capability, the pack can charge from 20% to 80% in just 12 minutes. “It is the largest ternary lithium battery in mass production globally for extended-range electric vehicles,” the company stated.
While not introducing a new cell chemistry, the Dragon Armor Battery is Svolt’s answer to structural innovations in battery design, following similar concepts such as BYD’s Blade Battery and CATL’s Qilin pack.
