Patent ID: 7035532

Claim:
A heat storage apparatus comprising: a heat storage material accommodation cell for accommodating therein a heat storage material having en electricity conductive characteristic and configured to be electrically heated; and a fluid passageway for allowing a heat exchanging fluid to flow therethrough, the fluid passageway being adjacent to the heat storage material accommodation cell via a bulkhead, wherein heat held in the heat storage material is transferred to the heat exchanging fluid so as to be taken out of the heat storage apparatus, and wherein the heat storage material accommodation cell and the fluid passageway are put in a spiral configuration together with the bulkhead in a heat storage main body of the heat storage apparatus, the heat exchanging fluid flowing in a spiral manner along the fluid passageway having the spiral configuration, wherein the heat storage material has a property in which electric resistance increases drastically when the heat storage material changes its phase from a solid to a liquid.