Electric quantity detecting and controlling method and device for rechargeable battery

Abstract

The invention discloses an electric quantity detecting and controlling method and an electric quantity detecting and controlling device for a rechargeable battery. The method comprises the following steps of: detecting an electric quantity change of the rechargeable battery in a current time period to update a cumulative electric quantity change; updating remaining available electric quantity in the current time period according to a remaining available electric quantity initial value and the electric quantity change in the current time period; updating the current internal resistance of the battery according to the remaining available electric quantity and the fully-charged available electric quantity in the current time period; determining a capacity-calibrated threshold voltage according to the current internal resistance; and calibrating the fully-charged available electric quantity and the remaining available electric quantity initial value in a next time period according to the threshold voltage and the accumulative electric quantity. The electric quantity detecting and controlling method has the advantages that: the precision is high, the method is convenient to implement and the like. Correspondingly, the electric quantity detecting and controlling device comprises a detection module, an internal resistance update module, a threshold voltage calibration module and an electric quantity calibration module, and has the advantages that: the device is convenient and simple to operate, the measurement precision is high and the like.

Description

technical field [0001] The invention relates to the field of battery detection and control, in particular to a method and device for detecting and controlling the electric quantity of a rechargeable battery. Background technique [0002] Rechargeable batteries are widely used in portable electronic products. Because they can be used repeatedly, they have the advantages of high efficiency, energy saving and environmental protection. Degradation will cause the capacity of the battery to gradually decrease, which will affect the working state of the battery. Therefore, accurate detection and regulation of battery power is one of the important factors to ensure the normal operation of electronic products. [0003] At present, rechargeable batteries made of materials such as Li and Fe have the advantages of short charging time, stable working performance, good safety, and long service life, and are mainstream products in the market. According to the charging and discharging cond...

AI Technical Summary

Problems solved by technology

However, after multiple cycles of current accumulation, the error will increase, and when the battery usage environment changes, the power will also change. This method cannot adapt to this change, resulting in an increase in error

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