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❊❧❡❝tr✐❝ ❉r✐✈❡s ❢♦r Pr♦♣✉❧s✐♦♥ ❙2st❡♠ ♦❢ ❚r❛♥s♣♦rt ❆✐r❝r❛❢t ✼ ✶✵✳✺✼✼✷✴✻✶✺✵✻ Figure 2. Distributed parallel hybrid-electric topology for distributed fans arrangement of electric drive to transport aircraft. But most importantly, the evolution of energy storage capability, in particular, the progress made in battery technology is of great relevance for establishing the competitiveness of hybrid-electric and universally-electric aircraft. Gravimetric specific power (the amount of power delivered per unit of mass) and gravimetric specific energy (amount of energy contained per unit of mass) are the key metrics for evaluating the battery application. These parameters are not independent characteristics and they are determined during battery design [29]. As a result, the combined enhancement of the specific energy and the specific power turns out to be a greater technological challenge than the single criterion optimization. Additional aspects such as gravimetric specific energy density, efficiency, design service goal, operating temperature, discharge behavior, safety, reliability and environmental sustainability need also to be considered when selecting the battery technology [30]. Lithium battery technology is regarded as a promising option for application in aviation. State-of-the-art lithium batteries reach specific energy of circa 200 Wh/kg at cell-level [31]. Extensive research focusing on improving the cathode and anode materials as well as on enhancing electrolyte properties [30, 32] aim to scale up the power and energy capability of batteries for aircraft application. Specific energy of around 400 Wh/kg is predicted to be achieved at cell-level through future progress in lithium battery technology [33].PDF Image | Electric Drives for Propulsion System of Transport Aircraft
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