Industry giants rush to mass-produce “solid‑state batteries”; why is Wei Jianjun (魏建军) repeatedly pouring cold water?

Industry sprint meets a cautionary voice

Automakers and battery makers globally are publicly racing to turn solid‑state batteries — long touted as the "ultimate" fix for range and safety — into production reality. But Great Wall Motor chairman Wei Jianjun (魏建军) has repeatedly poured cold water on the hype, saying the technology is still being rigorously validated and that real on‑vehicle application is "at least five years" away. Academician Ouyang Minggao (欧阳明高) of the Chinese Academy of Sciences offers a slightly more optimistic but still cautious timeline, suggesting concentrated test vehicles soon but broad scale‑up will take three to five years. Who’s right? The answer depends on materials, manufacturing and cost — not press releases.

Who is promising what — and when

Major players have put dates on the calendar. CATL (宁德时代) and BYD (比亚迪) have signalled 2027 as a key inflection point; it has been reported that BYD began solid‑state R&D in 2013 and plans demonstration starts in 2027, while CATL has pilot lines and small‑batch plans. EVE Energy (亿纬锂能) has rolled out its "Longquan 3/4" solid‑state cells claiming a 2026 350 Wh/kg target for a Version 1. Chery (奇瑞) unveiled a "Rhino S" cell reportedly exceeding 600 Wh/kg and a 1500 km single‑charge claim that it intends to test in 2026 with larger rollouts in 2027. Overseas incumbents — Toyota, Honda, BMW and Mercedes — are also running prototypes and pilot programs, with luxury models pitched as early adopters. Many of the high‑profile performance claims — "10‑minute charge for 1,500 km" or "won’t ignite on nail‑puncture" — should be treated as aspirational until independent validation arrives.

The hard engineering questions: materials, process, cost

Industry insiders point to three stubborn barriers: materials supply, manufacturing processes and cost. The leading sulfide route relies on lithium sulfide (硫化锂) precursors; Tinci Materials (天赐材料), Enjie (恩捷股份), Tianqi Lithium (天齐锂业) and Ganfeng Lithium (赣锋锂业) have started capacity build‑outs, but aggregate volume and long‑term stability remain constrained. Academician Sun Shigang (孙世刚) stresses that raising solid electrolyte ionic conductivity and stabilizing solid‑solid interfaces are still open scientific problems, while dry‑process coating, no‑separator stacking and pack integration are far from the scale maturity of liquid‑electrolyte cell lines. Today’s cost gap is stark: analysts estimate solid‑state packs are still roughly 3–5× pricier than conventional lithium packs. Firms from equipment makers to pack integrators are racing to close that gap, but it will take cross‑chain coordination and scale.

Outlook: measured optimism amid geopolitical ballast

The 2027 milestone has become the industry’s collective anchor, yet large‑scale commercial disruption of liquid lithium cells looks unlikely in the immediate term. It has been reported that consultancy EVTank forecasts global solid‑state shipments reaching 614 GWh by 2030 with about a 30% share — a bullish scenario contingent on supply chains, standards and cost declines. Geopolitically, battery materials and advanced cell technologies are strategic—trade frictions, export controls or incentives could accelerate some national roadmaps while slowing cross‑border collaboration. For now, Wei’s call for rationality echoes across boardrooms: solid‑state batteries may rewrite EV capabilities, but timelines will be set by engineering and economics, not marketing. Will 2027 be the turning point or just another milestone on a longer march? The industry is betting, and the lab results will tell.