June 12, 2025 | Shanghai, China — At the SNEC 2025 International Solar PV & Smart Energy Exhibition on June 11, Chinese energy storage innovator HiTHIUM announced the successful mass production of its groundbreaking ∞Cell 1175 Ah lithium-ion battery cell — the world’s first kilamp-hour-class cell designed for 4–8‑hour long-duration energy storage (LDES). This marks the inception of large-scale deployment of ultra-high-capacity energy storage batteries globally.
Developed since 2022 at HiTHIUM’s intelligent manufacturing base in Chongqing, the 1175 Ah cell incorporates five key innovations:
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Wide‑width thick coating with a coating mass density variance below 0.2% and CCD‑assisted inline inspection.
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Large‑electrode stacking alignment precision to 0.5 mm, achieving 35% higher throughput (0.1625 s/sheet).
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An original cell structure featuring an integrated 3D‑airflow top cover, overcoming structural stability challenges.
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Back‑end manufacturing enhancements delivering 45% efficiency gains.
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Advanced packaging with flexible rollers to eliminate wrinkles and air bubbles.
Distinctively tailored for 4–8 hour applications, this cell solves longstanding integration, cost, and safety challenges seen with prevalent 314 Ah and 587 Ah cells. With a capacity nearly 4× greater than traditional units, each cell stores approximately 3.76 kWh, significantly reducing system complexity and balance-of-system (BOS) costs.
HiTHIUM’s product safety lead, Dr. Liu Xiaoxiao, highlighted a robust, multi-layered safety architecture: advanced SEI/CEI chemistry, dual-mode thermal shielding, functional networked BMS, and fire-resistant enclosures — securing UL1973 and UL9540A certifications at SNEC, facilitating entry into North American and other global markets.
As of June 2025, HiTHIUM’s 1175 Ah cell production capacity had surpassed 1.2 GWh, officially marking scalable commercialization. The cells are slated for grid-scale peak-shaving, industrial/commercial storage, and renewable pairing deployments.
In addition, HiTHIUM is preparing ∞Power 6.25 MWh systems utilizing these cells while advancing overseas partnerships. At ees Europe in Munich, they unveiled such a system, and signed an EPC cooperation with Israel’s El-Mor to develop a long-duration storage project in Romania — backed by EU long-duration energy storage funding.
Analysts view the mass production of this kilamp-hour-class cell as a turning point: it unlocks cost efficiencies, safety benchmarks, and simplified system design — propelling long-duration storage from proof-of-concept to large-scale deployment worldwide.