Geely’s 500 Wh/kg solid-state battery doubles EV range, promises 1,000 km by 2027

Chinese automotive giant Geely has announced the development of next-generation solid-state electric vehicle batteries with an energy density of up to 500 Wh/kg. The company says the cells are already undergoing real-world validation, with a pilot production rollout scheduled for 2027.

The 500 Wh/kg figure is a major leap. It roughly doubles the energy per kilogram compared to the best lithium-ion cells currently shipping in production EVs. For context, high-nickel NMC cells in today's electric cars typically deliver 250–300 Wh/kg at the cell level. Tesla's 4680 cells are around 245 Wh/kg. LFP chemistry, which powers most affordable EVs, is even lower. When assembled into modules and packs, the effective energy density drops further — Zeekr's current "Golden Brick" LFP pack is rated at about 128 Wh/kg at the pack level.

A doubling of cell-level energy density fundamentally changes the EV design equation. Automakers can either keep the same range and cut the battery weight roughly in half, or maintain the same weight and push range dramatically higher. A lighter battery means a lighter vehicle, which requires less structural reinforcement and a smaller battery to achieve the same targets — creating compounding savings across the entire platform.

Geely is emphasizing the range advantage. The company says vehicles equipped with these cells will achieve a range "comparable to diesel-powered cars" — over 1,000 kilometers (about 620 miles) on a single charge. The battery is also claimed to have a lifespan of up to 1 million kilometers (621,000 miles).

The solid-state batteries are being developed within Geely Holding Group, the parent company that owns Geely, Zeekr, Lynk & Co, Volvo, Polestar, Lotus, and Smart. Which specific models will be the first to receive the new battery technology has not yet been announced.

While solid-state batteries have been a long-promised breakthrough in the EV industry, Geely's concrete timeline and validation progress set it apart from many earlier announcements. If the company meets its 2027 target, it could give its brands a significant competitive advantage in range and weight over rivals still relying on conventional lithium-ion chemistry.