Battery capacity measuring device
First Claim
1. A method for calculating a resulting capacity of a battery, characterized in that it comprises two parts, of which a first part comprises retrieving values from at least two discharge curves, in which the retrieved values are normalized and a second part comprises a calculation of the resulting capacity of the battery from the retrieved normalized values from the first part, wherein the discharge curves are a battery voltage as a function of time, that the battery capacity spent is calculated from the discharge curves, and that the first part of the method comprises the following steps:
- adapting each discharge curve to correspond to a specified approximate discharge current,measuring and registering the discharge current and the battery voltage during the discharge process of the battery, andcalculating a remaining battery capacity for each measurement of the discharge current and battery voltage from the battery capacity spent.
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Accused Products
Abstract
The present invention provides a fast, simple and accurate method for determining remaining battery capacity by taking into account the measured discharge parameters, such as voltage and current, which determine the shape of discharge curves for several different discharge currents. By normalizing the measured values, a normalized table is created that is used as a starting point for retrieving the remaining capacity in a battery at an arbitrary discharge current.
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Citations
10 Claims
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1. A method for calculating a resulting capacity of a battery, characterized in that it comprises two parts, of which a first part comprises retrieving values from at least two discharge curves, in which the retrieved values are normalized and a second part comprises a calculation of the resulting capacity of the battery from the retrieved normalized values from the first part, wherein the discharge curves are a battery voltage as a function of time, that the battery capacity spent is calculated from the discharge curves, and that the first part of the method comprises the following steps:
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adapting each discharge curve to correspond to a specified approximate discharge current, measuring and registering the discharge current and the battery voltage during the discharge process of the battery, and calculating a remaining battery capacity for each measurement of the discharge current and battery voltage from the battery capacity spent. - View Dependent Claims (2, 3, 4, 5, 6, 10)
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7. A control unit for calculating the resulting capacity of a battery, characterized in that it comprises means for
obtaining values from at least two discharge curves, normalizing the obtained values, calculating the resulting capacity of the battery from the normalized values calculating the battery capacity spent during discharge, from the obtained values for each discharge curve, registering the discharge current of the respective discharge curve, calculating the remaining battery capacity from the capacity spent, obtaining a table with at least two discrete voltage levels, entering the normalized remaining capacity into the table by interpolation of the normalized calculated values, entering the normalized discharge current into the table.
Specification