초록

A water storage device for a fuel cell system, which includes: a water storage section; and a volume expansion absorber which contracts to absorb volume expansion of water in the water storage section.

대표청구항 ▼

What is claimed is: 1. A water storage device of a fuel cell system, comprising: a water storage section adapted to store water to humidify a fuel cell; and a volume expansion absorber which contracts to absorb volume expansion of water due to freezing in the water storage section, wherein the volu

What is claimed is: 1. A water storage device of a fuel cell system, comprising: a water storage section adapted to store water to humidify a fuel cell; and a volume expansion absorber which contracts to absorb volume expansion of water due to freezing in the water storage section, wherein the volume expansion absorber includes a fixed member, a movable member movable relative to the fixed member by a spring element, and a seal member to seal between the fixed member and the movable member, and wherein the volume expansion absorber is formed of a material which is less resistant to deformation than material of an outer wall of the water storage section. 2. The water storage device of claim 1, wherein the volume expansion absorber is formed in a hollow cylinder with one end closed. 3. The water storage device of claim 2, wherein the volume expansion absorber has an opening on the other end thereof. 4. The water storage device of claim 3, wherein the volume expansion absorber is provided such that at least a part thereof is submerged in water in the water storage section and the opening is positioned outside of the water storage section. 5. The water storage device of claim 2, wherein the volume expansion absorber is formed of ethylene propylene rubber. 6. The water storage device of claim 2, wherein the volume expansion absorber is formed of high density polyethylene and polyamide, the high density polyethylene being on a surface of the volume expansion absorber to be in contact with water in the water storage section. 7. The water storage device of claim 1, wherein the movable member is formed to have a cylindrical shape and the seal member is formed to have a ring shape. 8. A fuel cell system comprising the water storage device of claim 1. 9. The fuel cell system of claim 8, further comprising: a heater which heats an inside of the water storage section of the water storage device. 10. The fuel cell system of claim 9, wherein the heater heats the inside of the water storage section by circulating a warming medium therein. 11. The fuel cell system of claim 9, further comprising: a cooling system for cooling the fuel cell, wherein a coolant of the cooling system is heated and used as a warming medium. 12. The fuel cell system of claim 11, wherein the coolant comprises an antifreeze liquid.