BYD Container ESS Battery Thermal Safety Upgrade with AG-ST-GF Aerogel Pad

BYD's containerized energy storage systems operate under demanding thermal conditions, where battery cell temperatures must be precisely controlled to prevent thermal runaway and ensure long-term cycle stability. BYD selected our AG-ST-GF Aerogel Glass Fiber Thermal Insulation Sheet as the inter-cell thermal barrier material across its container ESS product line.The ChallengeContainer ESS units house hundreds of lithium battery cells in confined space. During peak charge-discharge cycles, localized heat buildup between adjacent cells accelerates capacity degradation and raises thermal runaway risk. Conventional insulation materials either add excessive weight or fail to provide sufficient thermal resistance in the thin gaps between cells.SolutionAG-ST-GF aerogel glass fiber pads were installed between battery cells and module partitions. With thermal conductivity as low as 0.020 W/(m·K) and thickness of just 3–5mm, the material delivers high thermal resistance without compromising pack energy density. The glass fiber composite structure provides rigidity for stable long-term compression, while the aerogel core ensures flame retardancy meeting UL94 V-0 standards.ResultsInter-cell temperature differentials reduced, improving overall pack temperature uniformity. Thermal runaway propagation effectively delayed, extending safe response window. Lightweight design contributes to higher system energy density per unit volume. Stable supply partnership established supporting BYD's large-scale ESS production requirements.This collaboration reflects the growing adoption of aerogel-based thermal management in utility-scale energy storage, where safety, performance, and weight efficiency are critical design priorities.