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Devices with battery remaining capacity estimating functions

  • US 10,534,037 B2
  • Filed: 03/28/2018
  • Issued: 01/14/2020
  • Est. Priority Date: 11/30/2012
  • Status: Active Grant
First Claim
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1. A method for estimating a remaining capacity of a battery, said method comprising:

  • charging said battery via a host device;

    measuring, with said host device, a battery voltage of said battery during said charging;

    determining, using said host device, whether said battery is defined as being close to being fully charged based on said battery voltage and a condition that defines when said battery is close to being fully charged; and

    when said battery is defined as being close to being fully charged, then performing a plurality of operations using said host device, wherein said operations comprise;

    counting charges passing in said battery to estimate a calculated remaining capacity of said battery by monitoring a charging current of said battery;

    calculating a calculated capacity ratio of said calculated remaining capacity to a capacity reference of said battery;

    comparing said charging current with a current reference to generate a first comparison result;

    comparing said calculated capacity ratio with a ratio reference to generate a second comparison result;

    setting an amount according to said first and second comparison results;

    providing a calibrated remaining capacity by increasing said calculated remaining capacity by said amount if said charging current is less than said current reference and if said calculated capacity ratio is less than said ratio reference;

    calculating a calibrated capacity ratio in percentage form of said calibrated remaining capacity to said capacity reference; and

    controlling a screen to display said calibrated capacity ratio in percentage form to a user.

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