European Space Agency

Fuel cells for extra large telecommunication satellite

AddToAny

Objectives

The objective of this study was to compare future lithium battery system with Regenerative Fuel Cell system (RFCS) for large Telecommunication satellite platforms (25 to 50kW) from accommodation, operation, cost and mass perspective. 

Challenges

The main challenge is to cope with reliability and thermal requirements

Benefits

RFCS could reach a gravimetric performance of more than 300Wh/kg compared to state of the art at 220Wh/kg

Features

The RFCS is constituted of:

  • High Temperature-Proton Exchange Membrane fuel cell (FC)
  • High pressure Electrolyser (ELY).
  • Metal Hydride hydrogen storage , gaseous Oxygen and water tank
  • RFCS control unit (cell module voltage, stack voltage, discharge currents) and it provides alarm signals to the system,
  • Power switching unit to manage FC failures, ELY failures and auxiliary battery charge/discharge cycles or auxiliary fuel cell. 

System Architecture

The accommodation exercise minimised the platform redesign to comply with the mission requirements. In particular all propulsion options have been maintained. The batteries and RFCS size have been tuned to compare themselves at two power levels, 25kW and 43kW.

Plan

The first phase consists in gathering EPS design requirements for future SATComs. Then a benchmark between Li-ion Battery based and RFCS based systems is performed. At last, a technology roadmap is proposed to reach TRL 6 by 2030 

Current status

Completed 

Contacts

ESA Contacts

Status date

Friday, October 18, 2019 - 07:56