Cell capacity caculating method and cell capacity caculating device

Abstract

The invention relates to a cell capacity caculating method, which reads a present reference capacity of a cell, and converses the reference capacity to a corresponding voltage, obtains the present voltage of the cell, accumulates the times that the voltage is continuously smaller or larger than the reference voltage, when the time that the voltage continuously smaller than the reference voltage reaches a predetermined value, the reference capacity is adjusted to a lower value according to a ratio, and when the time that the voltage continuously larger than the reference voltage reaches a predetermined value, the reference capacity is adjusted to a larger value according to a ratio. Thereby, the capacity is not changed with the change of the voltage, and the capacity value is stable and correct.

Description

technical field [0001] The invention relates to a method for calculating electric quantity, in particular to a method for calculating battery capacity and a device thereof. Background technique [0002] At present, the display method of battery capacity usually uses a voltage-capacity comparison table to convert the voltage into the corresponding capacitance percentage, but this method often has the problem of insufficient accuracy of the capacitance. The reason is that if figure 1 As shown in the comparison chart of battery voltage (vertical axis) and capacitance (horizontal axis), when the load of the system is different, the discharge current of the battery will be different, so that figure 1 The corresponding curves of voltage-capacity discharge are different, and when the battery is charged with different currents, the corresponding curves of voltage-capacity charging are also different, so that the same battery voltage is charged or charged in different systems. Unde...

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Problems solved by technology

[0002] The current battery capacity performance method usually uses a voltage-capacity comparison table to convert the voltage into the corresponding capacitance percentage, but this method often has the problem of insufficient accuracy of the capacitance

The reason is that if figure 1 As shown in the comparison chart of battery voltage (vertical axis) and capacitance (horizontal axis), when the load of the system is different, the discharge current of the battery will be different, so that figure 1 The corresponding curves of voltage-capacity discharge are different, and when the battery is charged with different currents, the corresponding curves of voltage-capacity charging are also different, so that the same battery voltage is charged or charged in different systems. Under the current, the corresponding battery capacity has obvious differences, especially the battery capacity and voltage are non-linear correspondence, a small voltage change will cause a large error in the capacity, so if the voltage-capacity comparison table is used In this way, the capacity will jump up and down with the voltage change, causing the system to fail to display the accurate battery capacity

[0003] It can be seen that the above-mentioned existing capacitance obviously still has inconvenience and defects in methods, product structure and use, and needs to be further improved urgently.

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