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Electric storage device and method for charging same

  • US 9,787,119 B2
  • Filed: 12/14/2012
  • Issued: 10/10/2017
  • Est. Priority Date: 12/14/2012
  • Status: Active Grant
First Claim
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1. An electric storage device comprising:

  • SOC calculation section for calculating, in the case where a battery voltage of a lithium ion storage battery during charge has reached a predetermined value, a charge rate of a lithium ion storage battery when the battery voltage has reached the predetermined value;

    voltage difference calculation section for calculating, based on no-load characteristics of the lithium ion storage battery, a battery voltage difference corresponding to a difference between the charge rate calculated by the SOC calculation section and a preset charge rate during lithium deposition;

    charge complete voltage calculation section for calculating a charge complete voltage that is a criterion for determining whether or not to complete the charge, by adding the battery voltage difference calculated by the voltage difference calculation section to the battery voltage when the battery voltage has reached the predetermined value; and

    charge control section for completing the charge of the lithium ion storage battery when the battery voltage of the lithium ion storage battery has reached the charge complete voltage;

    wherein the charge complete voltage calculation section resets a maximum allowable voltage as a new charge complete voltage when the charge complete voltage calculated based on the battery voltage difference calculated by the voltage difference calculation section is higher than the maximum allowable voltage preset according to specifications of the lithium ion storage battery, and the charge control section completes the charge of the lithium ion storage battery when the battery voltage of the lithium ion storage battery has reached the reset new charge complete voltage.

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