Patent ID: 8704486

Claim:
An electricity storage system comprising: a plurality of secondary battery housing system racks in which secondary batteries and circuit blocks are respectively housed; and a power converter provided in common for the circuit blocks in the plurality of secondary battery housing system racks, wherein the secondary battery housing system rack having a positive-electrode-side terminal directly connected to a positive-electrode-side terminal of the power converter by a positive-electrode bus, and the secondary battery housing system rack having a negative-electrode-side terminal directly connected to a negative-electrode-side terminal of the power converter by a negative-electrode bus, are different from each other, wherein the positive-electrode-side terminal of the secondary battery housing system rack being directly connected to the positive-electrode-side terminal of the power converter means one of the positive-electrode-side terminals of the secondary battery housing system rack is first connected to the positive-electrode-side terminal of the power converter when viewed from the positive-electrode-side terminal of the power converter, while the negative-electrode-side terminal of the secondary battery housing system being directly connected to the negative-electrode-side terminal of the power converter means one of the negative-electrode-side terminals of the secondary battery housing system rack is first connected to the negative-electrode-side terminal of the power converter when viewed from the negative-electrode-side terminal of the power converter.