Fully-charged battery capacity detection method
First Claim
1. A fully-charged battery capacity detection method of detecting a capacity of a battery, the method comprising:
- detecting, via a voltage detection circuit, first and second no-load voltages (VOCV1, VOCV2) of the battery at a first no-load timing and a second no-load timing during which the battery is brought to a no-load state, respectively;
determining whether the detected first no-load voltage (VOCV1) falls within a predetermined voltage range, and determining, when the first no-load voltage (VOCV1) falls within the predetermined voltage range, first and second remaining capacities (SOC1 [%], SOC2 [%]) of the battery based on the first and second no-load voltages (VOCV1, VOCV2), respectively;
calculating a remaining capacity variation rate (δ
S [%]) based on a difference between the determined first and second remaining capacities (SOC1 [%], SOC2 [%]);
calculating a capacity variation value (δ
Ah) of the battery based on an integrated value of charging and discharging currents of the battery to be charged/discharged from the first no-load timing to the second no-load timing; and
calculating a fully-charged capacity (Ahf) of the battery based on the remaining capacity variation rate (δ
S [%]) and the capacity variation value (δ
Ah) according to the following formula;
Ahf=δ
Ah/(δ
S/100).
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Accused Products
Abstract
A fully-charged battery capacity detection method detects first and second no-load voltages (VOCV1, VOCV2) of a battery at first no-load timing and second no-load timing, respectively. Further, first and second remaining capacities (SOC1 [%], SOC2 [%]) of the battery are determined based on the first and second no-load voltages, respectively, when the first no-load voltage (VOCV1) falls within a predetermined voltage range. Moreover, a fully-charged capacity (Ahf) of the battery is calculated based on a remaining capacity variation rate (δS [%]) and a capacity variation value (δAh) of the battery. Also, the variation rate of the remaining capacity is calculated based on a difference between the first and second remaining capacities. The capacity variation value of the battery is calculated based on an integrated value of the charging current and discharge currents of the battery to be charged/discharged from the first no-load timing to the second no-load timing.
22 Citations
18 Claims
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1. A fully-charged battery capacity detection method of detecting a capacity of a battery, the method comprising:
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detecting, via a voltage detection circuit, first and second no-load voltages (VOCV1, VOCV2) of the battery at a first no-load timing and a second no-load timing during which the battery is brought to a no-load state, respectively; determining whether the detected first no-load voltage (VOCV1) falls within a predetermined voltage range, and determining, when the first no-load voltage (VOCV1) falls within the predetermined voltage range, first and second remaining capacities (SOC1 [%], SOC2 [%]) of the battery based on the first and second no-load voltages (VOCV1, VOCV2), respectively; calculating a remaining capacity variation rate (δ
S [%]) based on a difference between the determined first and second remaining capacities (SOC1 [%], SOC2 [%]);calculating a capacity variation value (δ
Ah) of the battery based on an integrated value of charging and discharging currents of the battery to be charged/discharged from the first no-load timing to the second no-load timing; andcalculating a fully-charged capacity (Ahf) of the battery based on the remaining capacity variation rate (δ
S [%]) and the capacity variation value (δ
Ah) according to the following formula;
Ahf=δ
Ah/(δ
S/100). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification