Abstract: The temperature difference battery includes a solution 2 which contains redox ion couples having a temperature-dependent redox potential. A low-temperature (LT) electrode 1 and a high-temperature (HT) electrode 3 are disposed in the solution 2. A membrane film 6 impervious to the redox ion couples is disposed between the HT electrode 3 and the LT electrode 1. A LT power electrode 7 is disposed between the LT electrode 1 and the membrane film 6, and a HT power electrode 8 is disposed between the HT electrode 3 and the membrane film 6. When there is a temperature difference between the electrodes 1, 3, the redox potential of the ion couples change, and thermoelectric power is generated between the LT electrode 1 and the HT electrode 3, which is used to charge the battery. The concentration of the redox ion couples in the LT region and in the HT region increases as charging progresses, and the membrane 6 maintains the concentration difference thus storing the electrical power.