State of charge measuring apparatus for battery device
First Claim
1. A state of charge measuring apparatus for a battery device comprising a battery;
- a load driven by electrical power supplied from the battery device, and a state of charge calculating device for detecting a charge current and discharge current of said battery device and for calculating an integrated state of charge of the battery device based on an integrated value of charge current and discharge current, comprising;
a voltage detecting device for detecting a terminal voltage of said battery device;
an upper limit substitution device for substituting said integrated state of charge value to an upper limit state of charge when a detected voltage obtained by said terminal voltage detecting device exceeds a predetermined voltage; and
a decreasing side corrected state of charge calculating device for calculating a corrected state of charge by correcting the integrated state of charge after said data substitution when the state of charge of the battery is decreasing;
wherein said decreasing side corrected state of charge calculating device corrects such that a difference between said integrated state of charge and said corrected state of charge increases as the integrated value of the charge and discharge currents increases.
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Abstract
A state of charge (SOC) measuring apparatus for a battery device is provided capable of detecting accurate state of charge based on integrating charge and discharge current. The state of charge measuring apparatus carries out data substitution for displaying and controlling state of charge depending on the upper limit SOC or lower limit SOC. The integrated SOC obtained by integrating charge and discharge currents is corrected into the corrected SOC by the incremented corrected value incremented at every data substitution time. The state of charge measuring apparatus corrects the integrated SOC at every data substitution such that the difference between the integrated SOC and the corrected SOC becomes larger, and when the integrated SOC is smaller than the upper limit SOC and larger than the lower limit SOC, the corrected SOC is displayed on the display portion as the displaying and controlling SOC.
32 Citations
13 Claims
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1. A state of charge measuring apparatus for a battery device comprising
a battery; a load driven by electrical power supplied from the battery device, and a state of charge calculating device for detecting a charge current and discharge current of said battery device and for calculating an integrated state of charge of the battery device based on an integrated value of charge current and discharge current, comprising;
a voltage detecting device for detecting a terminal voltage of said battery device;
an upper limit substitution device for substituting said integrated state of charge value to an upper limit state of charge when a detected voltage obtained by said terminal voltage detecting device exceeds a predetermined voltage; and
a decreasing side corrected state of charge calculating device for calculating a corrected state of charge by correcting the integrated state of charge after said data substitution when the state of charge of the battery is decreasing;
wherein said decreasing side corrected state of charge calculating device corrects such that a difference between said integrated state of charge and said corrected state of charge increases as the integrated value of the charge and discharge currents increases. - View Dependent Claims (3, 4, 5, 6, 7, 8, 10, 11, 12, 13)
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2. A state of charge measuring apparatus for a battery device comprising:
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a battery;
a load driven by electrical power supplied from the battery device and a state of charge calculating device for detecting a charge current and discharge current of said battery device and for calculating an integrated state of charge of the battery based on integrated values of charge current and discharge current, comprising;
a voltage detecting device for detecting a terminal voltage of said battery device;
an upper limit substitution device for substituting said integrated state of charge value to an upper limit state of charge when a detected voltage obtained by said terminal voltage detecting device exceeds a predetermined voltage; and
an increasing side corrected state of charge calculating device for calculating a corrected state of charge by correcting the integrated state of charge after said data substitution when the state of charge of the battery is increasing;
wherein said increasing side corrected state of charge calculating device corrects such that a difference between said integrated state of charge and said corrected state of charge increases as the integrated value of the charge and discharge currents increases. - View Dependent Claims (9)
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Specification