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Hybrid storage cell, vehicle and power storage unit employing same, smart grid vehicle system employing vehicle, and power supply network system employing power storage unit

  • US 9,385,543 B2
  • Filed: 10/09/2012
  • Issued: 07/05/2016
  • Est. Priority Date: 10/11/2011
  • Status: Active Grant
First Claim
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1. A hybrid storage battery comprising a plurality of virtual batteries connected in series to each other and each virtual battery comprising an organic solution based battery using an organic solution as electrolyte that is connected in parallel to an aqueous solution based battery using a aqueous electrolyte as electrolyte, wherein:

  • the organic solution based battery and the aqueous solution based battery of each virtual battery have average discharging voltages approximate to each other, and are so designed that a potentially overcharging voltage of the organic solution based battery is higher than a final charging voltage of the aqueous solution based battery and a final charging voltage of the organic solution based battery is lower than the final charging voltage of the aqueous solution based battery;

    the organic solution based battery of each virtual battery becomes overcharged if it is charged beyond its final charging voltage, and gets into a dangerous state if it is charged beyond its potentially overcharging voltage, and the aqueous solution based battery of each virtual battery becomes overcharged if it is charged beyond its final charging voltage; and

    when each of the plurality of virtual batteries is supplied with sufficient overcharging energy to get the organic solution based battery to become overcharged, the aqueous solution based battery carries out a hydrogen evolving reaction to absorb the overcharging energy so that a charging voltage of the virtual battery is suppressed to the final charging voltage of the aqueous solution based battery, thereby preventing the organic solution based battery from reaching its potentially overcharging voltage, andwherein the organic solution based battery and the aqueous solution based battery are so designed that the average discharging voltage of the organic solution based battery lies between the final charging voltage of the aqueous solution based battery and the average discharging voltage of the aqueous solution based battery.

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