EVwire brief: Geely, BYD, and CATL have each committed to small-scale solid-state battery production in 2027, marking the first time all three have pointed at the same timeline.
Geely made the biggest claim on August 18: 500 Wh/kg, roughly double today's best lithium-ion cells, with range above 1,000 km (621 mi) per charge. Real-world validation started this year, and pilot cells are heading to Zeekr, Volvo, Polestar, Lotus, and Smart vehicles next year.
BYD published six patents in late July on a dual-electrolyte cathode that pairs halide and sulfide solid components. Trial cells will go into camouflaged test vehicles in 2027.
CATL confirmed the same 2027 window in a July 29 investor disclosure, expressing confidence in what it called a leading position in solid state batteries.
Geely is making the boldest claim of the three: 500 Wh/kg and over 1,000 km of range, with pilot cells heading to Zeekr, Volvo, and Polestar vehicles next year. (Geely)
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Each company is taking a different path.
Geely has partnered with Dow Chemical on adhesive materials stable from minus 40 to 120°C, tackling one of the toughest problems in solid-state design: keeping solid layers in contact as temperature swings cause them to expand and contract at different rates. The company says its current cells sit around 250 Wh/kg. The new solid-state tech would roughly double that.
BYD's patents focus on the boundary between solid electrolyte and electrode. One places a buffer layer between cathode and sulfide electrolyte to prevent direct contact and lower the chance of a heat event. Another pairs monocrystal material (resistant to cracking) with polycrystalline material (better for fast charge and discharge) in a dual-layer cathode. A sixth sets a manufacturing benchmark: at least 60% of every cathode particle's outer edge must sit flush against the surrounding electrolyte.
CATL has shared fewer technical details but controls roughly 43% of China's battery market. Its chief scientist, Wu Kai, has said the goal is TRL 7 or 8 by next year: a working prototype tested under real commercial conditions, not in a lab.
BYD's six new solid-state patents target the toughest engineering problem: making solid electrolytes bond cleanly with electrodes without degrading over time. (BYD)
Context:
Solid-state batteries have been the industry's most reliable broken promise for over a decade. Toyota has been projecting commercial readiness "within a few years" since the mid-2010s. QuantumScape went public in 2020 on the strength of lab results. SBD Automotive called it "the future that's always two years away." Every cycle brings new timelines, and every timeline slips.
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What makes 2027 different, at least on paper, is the breadth. This is not one startup with a lab demo. Three companies that together produce the majority of the world's EV batteries are now pointing at the same window, backed by patent filings and investor disclosures rather than press-event promises.
But even the companies making these commitments are hedging. CATL chairman Robin Zeng said in June that the company's cells scored just four out of nine on the Technology Readiness Level scale, placing them squarely in the lab-validation phase.
CATL controls over 43% of China's battery market and is gunning for TRL 7 by next year, but its own chairman admits mass-market solid-state cells are still years away.
He added that mass-market adoption was "years away" and that the first commercial cells would land only in premium vehicles above 250,000 yuan ($37,000). CATL has separately set its threshold for large-scale production at one million vehicles, a figure Zeng has called a very small possibility before 2030.
They are not alone in the race. Farasis Energy, backed by Mercedes, is targeting 2027 EV validation. Gotion High-Tech, part-owned by Volkswagen, is developing 350 Wh/kg cells with road tests planned for 2027. EVE Energy says it will showcase its first-generation cells this year and a higher-density second generation by 2028.
The gap between "pilot production" and "a battery you can buy in a car" has swallowed entire companies. Perhaps it’s important to assume that what these three companies are forecasting for 2027 is the start line of the solid state revolution, not the finish.
Source: IAA Mobility, CarNewsChina, and SBD Automotive
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