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Charging control method for lithium-ion battery, charging control apparatus for lithium-ion battery and lithium-ion battery system

  • US 9,882,406 B2
  • Filed: 08/18/2015
  • Issued: 01/30/2018
  • Est. Priority Date: 09/04/2014
  • Status: Active Grant
First Claim
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1. A charging control method for controlling charging of a lithium-ion battery, which is provided with a positive electrode and a negative electrode, the charging control method comprising:

  • charging processing for charging the lithium-ion battery to a target voltage by a constant-current and constant-voltage charging method, the lithium-ion battery including a cathode active material having Olivine-type crystal structure;

    negative-electrode potential evaluation processing for evaluating a potential change quantity of the negative electrode; and

    voltage setting processing for setting the target voltage to decrease based on the potential change quantity of the negative-electrode evaluated by the negative-electrode potential evaluation processing;

    whereinthe negative-electrode potential evaluation processing evaluates the potential change quantity of the negative-electrode based on one of or both of a charging voltage, which is measured as a voltage charged to the lithium-ion battery, and a discharging voltage, which is measured as a voltage discharged from the lithium-ion battery; and

    the negative-electrode potential evaluation processing specifies a stepwise change point, at which a quantity of change in one of or both of the charging voltage and the discharging voltage relative to the charging rate changes in excess of a threshold value, and evaluates the potential change quantity of the negative electrode based on a shift quantity of the stepwise change point in increasing and decreasing directions.

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