Patent ID: 7892697
Filing Date: 2011-02-22
Classification: F17C,H01M,Y02B,Y02E

Abstract:
1. A fuel cell system comprising: a fuel cell assembly which includes a fuel cell provided with an anode supplied with a liquid fuel and a cathode supplied with an oxidant; a liquid tank is detachably provided in the fuel cell assembly; and a fuel supply unit for supplying the liquid fuel from the liquid tank to the anode, the liquid tank including: a first container; a second container provided in the first container to contain liquid and gas, the liquid being the liquid fuel to be supplied to the fuel cell; an outlet which is provided in the first container and discharges the liquid outside the first container; a connecting pipe which connects the outlet to the second container; and a viewer provided to make the interior of the connecting pipe viewable, wherein the connecting pipe is made of a transparent material, a guide object is provided opposite to the viewer across the connecting pipe so as to improve viewability of the interior of the connecting pipe, a size of the guide object as viewed through the connecting pipe differs depending on whether the liquid is flowing through the connecting pipe or the gas is flowing through the connecting pipe, due to a difference in associated refractive indexes inside the connecting pipe, and an alert color is applied to an area in the guide object that becomes viewable only when the gas is flowing through the connecting pipe.