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Battery-state monitoring apparatus

  • US 8,996,324 B2
  • Filed: 07/07/2009
  • Issued: 03/31/2015
  • Est. Priority Date: 07/11/2008
  • Status: Expired due to Fees
First Claim
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1. A battery-state monitoring apparatus, comprising:

  • a secondary battery supplying an electric power to an electric load; and

    a state detecting part detecting a battery state of said secondary battery by being supplied with a power from said secondary battery, said state detecting part being set in one of a detection mode to detect a battery state of said secondary battery and a standby mode in which a power consumption of said state detecting part is smaller than said detection mode such that said state detecting part is intermittently set in the detection mode in a return period; and

    , the state detecting part using said secondary battery as a power source,wherein said battery-state monitoring apparatus includes a start-up detecting part detecting a start-up of said electric load;

    wherein, when a number of times of determination, which indicates that a current value consumed by said electric load is smaller than or equal to a predetermined current value, is larger than or equal to a predetermined threshold value, said state detecting part waits for a detection of said battery state in a standby mode until said start-up is detected by said start-up detecting part; and

    wherein said state detecting partperforms, during said return period that occurs at a first interval, a first remaining amount correction process where a remaining amount of charge of said secondary battery is calculated by subtracting, from said remaining amount of charge detected in said detection mode prior to said return period, a value obtained by multiplying a predetermined current consumption value, which is consumed by said electric load in said standby mode, by a standby time indicating duration of said standby mode after the detection mode, andperforms, during said return period that occurs at a second interval, a second remaining amount correction process where the remaining amount of charge of said secondary battery is calculated based on an open voltage of said secondary battery, the second interval being longer than the first interval.

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