An output control device of a lithium ion battery includes an output control unit that controls an output of the lithium ion battery, and a computation unit that transmits a command to the output control unit, the computation unit calculates a distribution of a current and/or a potential within the electrode thickness of the negative electrode of the lithium ion battery by using a heterogeneous reaction model in the thickness direction of the electrode, and compares the distribution with a specified range in the negative electrode, and/or calculates a distribution of a current and/or a potential within the electrode thickness of the positive electrode of the lithium ion battery by using a heterogeneous reaction model in the thickness direction of the electrode, and compares the distribution with a specified range in the positive electrode, and transmits a command to the output control unit on the basis of a result of the comparison, and the output control unit controls an output voltage and/or an output current of the lithium ion battery on the basis of the command.
