Chinese battery maker Sunwoda says its all-solid-state battery has completed product design and process verification and is now in sample testing with customers. The company said so on Oct. 30 on the Shenzhen Stock Exchange's investor platform, according to IT Home and National Business Daily. It didn't name the customers.
Two approaches
CarNewsChina says Sunwoda's programme uses a polymer-composite electrolyte, while CATL is developing sulfide-based cells. CATL reaffirmed its target of small-batch production in 2027 in an Oct. 27 investor response. CarNewsChina also notes that Sunwoda had already reported customer testing in May 2026, so this is an update rather than a new programme.
Reported figures
- A 20 Ah cell with a reported energy density of 400 Wh/kg.
- More than 1,200 cycles under external pressure below 1 MPa. Some sulfide designs need sustained pressure to keep the electrodes in contact.
- A 12-micron polymer-composite membrane and a silicon anode. The cell reportedly passed a 200°C hot-box test.
- A pilot line with 0.2 GWh of annual design capacity.
CarNewsChina cautions that cell-level results don't prove the same performance in a full vehicle pack.
Customers going in-house
IT Home reports that an investor asked how Li Auto and Xiaomi switching some models to in-house batteries would affect Sunwoda's results this year. Sunwoda said it supports its customers' decisions, has stable relationships with them and will try to increase its share.
