Enpower Greentech announce it has developed battery for HAPS communications

April 5, 2023
The company says the demonstrations was its first lithium metal battery to pass all tests in the extreme conditions of the stratosphere.

ANN ARBOR, Mich., - Enpower Greentech, Inc. (EGI), a manufacturer of next-generation batteries in Palo Alto, Calif.,, has announced the successful development of a high-performance battery designed to perform in extreme stratospheric conditions where High Altitude Platform Stations (HAPS) provide wireless communications. The battery pack design provided 300 Wh/kg energy that was made possible from the EGI cells rated at 439 Wh/kg.

Enpower Greentech lithium-metal battery cells, with specific energy of 439 Wh/kg, were coupled with constraints, heaters, and insulation materials to ensure proper temperature and pressure control in extreme conditions at an altitude of 20 kilometers. Validation was completed with charge-discharge cycle tests of the battery pack in the stratosphere from January 30 to February 2, 2023, in the United States.

This test marked the first successful operation of Enpower Greentech's lithium-metal battery in extremely low temperatures (around -60°C) and near-vacuum pressures (of 0.05atm) in the stratosphere. Before testing in the stratosphere, the battery pack was submitted to all ground tests, including those for crash, thermal abuse, vibration, and external short circuit. Both ground and aerial results provide a clear indication of technological maturity and create a roadmap for future advances in both aerial and terrestrial battery powered vehicles.

With these technical accomplishments, Enpower Greentech will continue to develop and commercialize this next-generation battery. Regional advantages have allowed EGI to achieve breakthrough innovations from their subsidiaries in the United States, China, and Japan drawing from the relative strength of each base. Stratospheric demonstrations with SoftBank Corp. also provide a checkpoint for Enpower Greentech to move into the next phase of expansion and production.

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