BYD Co. confirmed on Monday that pilot production of its first-generation solid-state lithium battery has begun at the company's Shenzhen R&D and prototype manufacturing facility, with commercial launch scheduled for the 2027 model year in selected high-end vehicles. The announcement was made by BYD Chairman Wang Chuanfu during a closed-door investor briefing on Monday morning, and confirmed in a regulatory filing with the Hong Kong Stock Exchange that afternoon.
Initial production volume at the Shenzhen pilot line is set at approximately 200 MWh annually, sufficient to equip around 2,500-3,000 vehicles in the first commercial year. The cells achieve an energy density of 400 Wh/kg at the cell level, BYD said in technical materials accompanying the filing — significantly higher than the 235-265 Wh/kg range of the company's current lithium iron phosphate Blade batteries, but at a substantially higher production cost that the company is targeting to reduce through automation improvements over 2026 and 2027.
"This represents the most significant battery technology transition since the introduction of the Blade architecture in 2020," Wang said in remarks during the investor briefing, according to attendees who provided notes to local financial media. "Our timeline for full commercial deployment depends on production yield improvements that are still uncertain. We will not rush a product into wide release if quality and durability data are not where we require them to be."
Technical specifications and supplier base
The BYD solid-state cell uses a sulphide-based solid electrolyte derived from collaborative research with Tsinghua University and the Chinese Academy of Sciences. The architecture eliminates the liquid electrolyte and porous separator of conventional lithium-ion cells, replacing both with a unified solid ion-conducting layer. According to the technical filing, this allows the cathode to use higher nickel content (around 85% Ni) without the thermal runaway risks associated with high-nickel cells in liquid electrolyte form.
BYD has secured supply agreements with two domestic Chinese chemical producers — Yunnan Lithium Industries and Anhui Solid State Materials — for the high-purity sulphide precursors required for electrolyte production. The company has not disclosed the specific contracts but confirmed that domestic supply chain capacity has been the principal constraint on pilot scale-up. Analysts at Citic Securities noted in a research note Tuesday that material costs for the pilot batches are estimated at approximately 280-340 yuan per kWh, compared with 95-115 yuan per kWh for the company's mass-produced Blade LFP cells.
Commercial deployment scenarios
Industry analysts expect BYD's first solid-state vehicle to be a high-end Yangwang or Denza model, where the cost premium can be absorbed by the segment pricing. Wang did not confirm specific models in the briefing, but indicated that commercial launch in 2027 would be limited to "low-volume premium variants" rather than mass-market vehicles. CATL and CALB, BYD's principal Chinese battery competitors, are pursuing parallel solid-state development programmes, with CATL having previously indicated 2027 pilot production and 2028-2029 commercial scaling.
Toyota's announcement in late 2024 that it would launch a solid-state hybrid model in 2027 set the de facto industry deadline for Asian automakers to confirm their own timelines. BYD's announcement places it ahead of CATL on the public commitment timeline by several months, and roughly aligned with Toyota's stated commercialisation target. Korean players Samsung SDI and LG Energy Solution have indicated 2028 as their solid-state commercial timeline, but neither has confirmed pilot production.
Market reaction
BYD shares rose 4.8% on the Hong Kong exchange following the announcement, the largest single-day gain in nearly four months. CATL shares fell 1.6% on competitive pressure concerns, while LG Energy Solution shares in Seoul fell 2.4%. Volkswagen Group ADRs gained 1.8% in pre-market trading following separate confirmation that the German automaker is in early-stage discussions with BYD on potential battery supply for European-market vehicles, though no specific solid-state agreement was disclosed.
The pilot line at Shenzhen is the first of three expected solid-state production facilities planned by BYD, with second and third phase expansions scheduled for the company's Bengbu and Xi'an campuses in 2027 and 2028. Combined production capacity at full scale is targeted at 10-12 GWh annually by 2029, sufficient to equip approximately 130,000-160,000 vehicles per year. BYD has not disclosed total capital expenditure for the multi-phase expansion.