Cognition device for battery residual capacity
First Claim
1. A device for determining residual capacity of a battery, comprising:
- means for sensing output voltage of a battery;
means for sensing ambient temperature of said battery;
means for storing discharge characteristic data relating to the energy storage characteristics of said battery;
means for correcting the sensed output voltage of said battery by an amount proportional to a load across said battery;
means for reading characteristic data from said storing means corresponding to said sensed ambient temperature; and
means for comparing said read characteristic data with said corrected output voltage and computing the residual capacity of said battery based on the characteristic data matching said corrected output voltage.
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Abstract
In a cognition device for battery residual capacity, battery voltage information and battery ambient temperature information are input to a microprocessor through an A/D converter. In the microprocessor, the voltage information is corrected with load information; the data conforming to the ambient temperature information are read out of the battery discharge characteristic data which are previously stored in memory, and the readout data are compared with the corrected voltage information so that the battery residual capacity can be computed from the result of the above comparison data. In this arrangement, it is therefore possible to accurately recognize battery residual capacity at an arbitrary point in time.
204 Citations
7 Claims
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1. A device for determining residual capacity of a battery, comprising:
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means for sensing output voltage of a battery; means for sensing ambient temperature of said battery; means for storing discharge characteristic data relating to the energy storage characteristics of said battery; means for correcting the sensed output voltage of said battery by an amount proportional to a load across said battery; means for reading characteristic data from said storing means corresponding to said sensed ambient temperature; and means for comparing said read characteristic data with said corrected output voltage and computing the residual capacity of said battery based on the characteristic data matching said corrected output voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for determining residual capacity of a battery, comprising the steps of:
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storing discharge characteristic data relating to the energy storage characteristics of a battery; sensing output voltage of said battery; sensing ambient temperature of said battery; correcting the sensed output voltage of said battery by an amount proportional to a load across said battery; reading stored discharge characteristic data corresponding to said sensed ambient temperature; and comparing said read discharge characteristic data with said corrected output voltage and computing the residual capacity of said battery based on the discharge characteristic data matching said corrected output voltage.
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Specification