Not sure how credible this is, but it seems more credible than that Finnish company's claims. This one comes from an established battery manufacturer and according to the article the cells have survived puncture tests etc. already.

After achieving a breakthrough earlier this week, Greater Bay Technology said it aims to launch the world’s first mass-producible all-solid-state battery this year.

China ramps up solid-state EV battery production

Greater Bay Technology (GBT) is a battery manufacturer backed by China’s GAC Group. The battery startup focuses on developing ultra-fast charging and solid-state batteries.

It even set the world record for the “fastest charging technology for electric vehicles” in 2024 with its Extreme Fast Charging (XFC) batteries, which recharged from 0% to 80% in just 7.5 minutes.

On Monday, the company announced it had hit another major milestone, with its first A-sample all-solid-state battery cells rolling off the production line.

The A-sample battery cells contain no liquid electrolyte and successfully passed needle penetration, extrusion, and thermal shock tests without a fire or explosion.

GBT said the breakthrough enables all-solid-state EV batteries to move from the lab to industrialization as it aims to begin mass production in 2026. According to Chinese news outlet, NE-Time, GBT aims to launch the “world’s first mass-producible all-solid-state battery” with GWh-level mass production and in-vehicle use by 2026.

The new tech overcomes the hurdles that have prevented all-solid-state batteries from hitting the mass market with a new organic-inorganic composite ESC all-solid-state electrolyte system.

GBT’s battery tech has already been reviewed and is receiving support from China’s National Development and Reform Commission (NDRC).

With a single cell energy density of 260-500 Wh/kg, considerably higher than traditional liquid lithium-ion batteries, the cells enable a longer driving range, faster charging, and more interior space.

The new tech enables stable 2-3C fast charging, which has been another major barrier for solid-state EV batteries. It also showed minimal cycle-life degradation during long-term, repeated charge-and-discharge cycles.