Abstract
Alongside the advancement of navigation, control, and communication technologies, which are fundamental aspects of unmanned underwater vehicles (UUVs), research & development on UUV energy system for long-term mission capabilities has been conducted actively since the 2000s. The hydrogen fuel cell energy system (FCES), which is characterized by low noise, air-independent propulsion, and high energy density, has attracted considerable attention as the energy system for UUVs. In this paper, the key features of the components of a hydrogen FCES meant for use in large-class UUVs are presented. In addition, the current technological development status of FCES-powered large-class UUVs is outlined. Finally, the factors that must be considered when designing large-class UUVs powered by hydrogen FCESs are discussed.
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