Patent ID: 7964312

Claim:
A fastener, comprising: a pair of fastening members which sandwich an electricity generating cell therebetween; wherein at least one of the pair of fastening members has electrical conductivity, is connected to the electricity generating cell, and is provided with a humidity changing device which changes a humidity of gas to be supplied to the electricity generating cell; wherein current is collected using the at least one of the pair of the fastening members; and wherein the humidity changing device comprises: a hollow fiber membrane through an inside of which a first fluid for the gas to be supplied to the electricity generating cell flows, the hollow fiber membrane allowing a water molecule to move between the inside and outside of the hollow fiber membrane; and a casing having a flow-path through which a second fluid flows outside of the hollow fiber membrane, the second fluid being one of a gas having a humidity different from a humidity of the first fluid and a liquid including water.