The utility model relates to an electric power storage device and an electric vehicle, and discloses an electric power storage device, an electronic apparatus, an electric vehicle, and an electric power system. According to one embodiment, the electric power storage device comprises a cell block composed of multiple cell units, and an isolating unit capable of carrying out wireless transmission of the cell information of the concerned cell block. The electric power storage device of the utility model is particularly suitable for obtaining voltage information from individual electric power storage modules when multiple electric power storage modules are serially connected.