Hydrogen storage is a key enabling technology for the extensive use of H2 as an energy carrier. The European integrated project STORHY aims to develop robust, safe and efficient hydrogen storage systems for automotive applications. Through different subprojects, it addresses three major storage technologies, namely: compressed gas in composite vessels at 70 MPa (700bar), liquid hydrogen in cryogenic tanks, and solid storage in complex hydride form. The present paper is focused on the STORHY technical subproject dedicated to the development of high-pressure composite vessels. Within a set of general requirements and technical targets commonly defined by car makers, the subproject aims to develop lightweight compressed gas vessels at 700bar. These vessels of type III or IV consist of a metal or polymer liner with appropriate bosses and valve connections, in a fiber reinforced composite structure. The project is focused on developing adequate material compatible with hydrogen use, new manufacturing processes and alternative type concepts. Enabling technologies like fast filling, health monitoring and recycling are also considered in order to take into account the whole life cycle of the pressure vessel. Developments are mostly dedicated to on-board storage but, as an alternative, a hydrogen storage system based on the concept of a removable rack is also developed.

The main achievements of the STORHY subproject pressure vessel after four years of joint effort are reported in this paper.