SoftBank Corp. (9434) · InitiativeAdvanced
Stratospheric Operational Demonstration of Next-Generation Lithium-Metal Batteries for HAPS
First written in FY2023. 1 of 2 entries say "Advanced", first in FY2025. Latest entry: FY2025.
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- FY2025AdvancedAnnual report
「This enabled highly accurate lifetime prediction with a coefficient of determination of R² = 0.89.」
For lithium-metal batteries, the Company developed a machine-learning lifetime prediction model through joint research with NIMS and achieved prediction accuracy with a coefficient of determination of 0.89. - FY2023First statedAnnual report
「The Company developed battery packs for stratospheric communications platforms using next-generation lithium-metal battery cells manufactured by Enpower Japan, with a gravimetric energy density of 439 Wh/kg. Together with HAPS Mobile Co., Ltd., it conducted charge-discharge cycle testing of the battery packs in the stratosphere in the United States from 30 January to 2 February 2023. This was the first successful demonstration of normal operation in the stratosphere.」
For next-generation lithium-metal batteries for HAPS, the Company developed battery packs with a gravimetric energy density of 439 Wh/kg and successfully demonstrated normal operation in the stratosphere for the first time from late January to early February 2023.