Abstract: Disclosed is a heat pipe circuit type thermal battery which can store, release, and efficiently utilize heat and/or cold. The thermal battery mainly includes an energy storing chamber for containing phase change medium to store or release heat energy via the change of the phase change medium between the solid and liquid phases, a heat pipe circuit formed from a plurality of vertically arranged parallel heat pipes to guide working fluid flowing therein and transfer energy through phase changes of condensing and boiling of the working fluid, and two heat exchangers separately serving as heat source and heat sink. Heat energy contained in flowing fluid in the heat-source heat exchanger is transferred to the working fluid in the heat pipe circuit and then stored in the energy storing chamber. On the other hand, energy stored in the energy storing chamber can be released and transferred to the heat-sink heat exchanger via the heat pipe circuit.