Helios Horizon Flies First Manned Electric Aircraft with All-Solid-State Batteries, Achieving 410Wh/kg Energy Density and Sub-15 Minute Fast Charging

Helios Horizon / Aviation International News USA

Overview

Florida-based nonprofit Helios Horizon successfully flew the first manned electric aircraft powered by all-solid-state batteries, marking a new step in electric aviation history. This new solid-state battery achieved an energy density of 410 Wh/kg, a 60-80% improvement over previous Li-ion batteries (260Wh/kg), and charges from near empty to 80% in under 15 minutes. Test pilot Miguel Iturmendi completed a series of short-range test flights in a modified Pipistrel Taurus motor glider, demonstrating the necessary range, charging time, and safety for practical commercial electric aviation.

In Depth

Key Findings

Helios Horizon, a Florida-based non-profit organization, has successfully flown the first manned electric aircraft powered by all-solid-state batteries, marking a new milestone in the history of electric aviation, including eVTOL. This innovative all-solid-state battery system demonstrated groundbreaking performance, achieving a high energy density of 410 Wh/kg and enabling the battery to charge from near empty to 80% in less than 15 minutes.

Technical & Clinical Details

• Helios Horizon’s new all-solid-state battery achieved an energy density of 410 Wh/kg, representing a 60-80% improvement over the lithium-ion batteries (260 Wh/kg) previously used in electric aircraft. This significant advancement substantially extends the range and payload capacity of electric aircraft.
• Remarkable progress was also observed in charging time, with the battery capable of charging from near empty to 80% in under 15 minutes. This enables rapid turnaround times for commercial electric aircraft, dramatically improving operational efficiency.
• Test pilot Miguel Iturmendi completed a series of short-range test flights using a modified Pipistrel Taurus motor glider, validating the integration of all-solid-state batteries into aircraft and their performance under real-world conditions.
• As all-solid-state batteries do not use liquid electrolytes, the risk of thermal runaway is significantly reduced, enhancing battery safety and reliability. This is critically important for applications like aircraft, where safety is paramount.

Background & Context

Electric aviation holds immense promise for the future of urban air mobility (UAM) and short-range regional transport, but its widespread adoption is contingent upon high-performance and safe batteries. Existing lithium-ion batteries have limitations in energy density and charging speed, posing challenges for the range and operational costs of electric aircraft. All-solid-state batteries are gaining attention as a technology that can overcome these challenges and significantly expand the possibilities of electric aviation.

Strategic Significance & Outlook

Helios Horizon’s successful flight of a manned electric aircraft powered by all-solid-state batteries represents a decisive step towards the practical realization of commercial electric aviation. The combination of high energy density and ultra-fast charging capabilities will improve the economics and practicality of electric aircraft, significantly contributing to the decarbonization of the aviation industry and a sustainable future. Moving forward, further development and scaling of this technology are expected to accelerate the commercial deployment of a wide range of electric aircraft, including short-haul air transport, air taxis, and logistics drones. This achievement serves as a powerful illustration of how battery technology can transform the aerospace industry.