Heat exchange apparatus for cooling water of fuel cell and fuel cell system including the same

A heat exchange apparatus for cooling water of a fuel cell, the heat exchange apparatus comprising:

• a body, through which a cooling water pipe passes, wherein cooling water that is to be supplied to a fuel cell stack flows through the cooling water pipe;
• and
• a heat accumulator arranged in an interior of the body and including therein a PCM heat accumulation material that is to exchange heat with the cooling water,
• wherein the body includes a medium space arranged between the cooling water pipe and the heat accumulator such that the heat accumulator is spaced apart from the cooling water pipe,
• wherein the PCM heat accumulation material exchanges heat with the cooling water by a medium of the medium space,
• wherein the body has a tubular shape having a hollow, into which the cooling water pipe is inserted, and an inner surface spaced apart from an outer surface of the cooling water pipe to define the medium space in the hollow,
• wherein the cooling water pipe is elastically deformed depending on a change in an internal pressure thereof, and
• wherein a spacing interval between the heat accumulator and the cooling water pipe is changed as the cooling water pipe expands or contracts in the radial direction of the body due to the change in the internal pressure of the cooling water pipe.