Method and device for battery capacity detection

Abstract

The invention discloses a method for battery capacity detection, which includes the following steps: obtaining battery initial electric quantity according to a battery current voltage value; charging or discharging a battery, simultaneously performing integrating operation on a current value during battery charging or battery discharging until battery charging or battery discharging is stopped, and obtaining a changing value of electric quantity; obtaining theoretical electric quantity after battery charging or battery discharging according to a voltage value after battery charging or battery discharging; and comparing the difference of the battery initial electric quantity and the theoretical electric quantity after battery charging or battery discharging with the electric quantity changing value, and obtaining practical electric quantity of the battery according to correction of comparison results. Through the method, the battery initial electric quantity is obtained according to the battery practical voltage, and the current integrating value in the whole process of battery charging or battery discharging is calculated so as to perform battery electric quantity self-adapting correction, the effect of accurately obtaining the practical battery electric quantity during battery charging or battery discharging is achieved, and design cost is low.

Description

technical field [0001] The invention relates to the technical field of electronic detection, in particular to a method and device for detecting battery power. Background technique [0002] With the continuous advancement of science and technology, various electronic products have been widely popularized, and batteries have become an indispensable product component in people's daily work and life. Therefore, the detection of the battery power has been deeply concerned by the majority of users. [0003] At present, the detection of battery power on the market mostly adopts the detection method based on the design of a general-purpose single-chip microcomputer. This method mainly realizes the detection of battery power through the following two methods: the first detection method is to calculate the current battery power by detecting the battery voltage, and the second is to detect the battery power. The second detection method is to calculate the corresponding battery power b...

AI Technical Summary

Problems solved by technology

[0003] At present, the detection of battery power on the market mostly adopts the detection method based on the design of a general-purpose single-chip microcomputer. This method mainly realizes the detection of battery power through the following two methods: the first detection method is to calculate the current battery power by detecting the battery voltage, and the second is to detect the battery power. The second detection method is to calculate the corresponding battery power by integrating the battery current; for the first detection method, because during the charging or discharging process of the battery, the detected battery voltage is either higher than the actual battery voltage Either it is low, which will cause a large deviation between the displayed battery power and the actual battery power; for the second detection method, if the battery specifications are the same, it is more practical; if it is replaced with a battery with a different specification or a different nominal power , there will be a phenomenon that the battery power display is completely wrong; at the same time, with the different battery usage time, the total battery power will change accordingly, which will also cause a large deviation in the actual battery power detection results

[0004] In the prior art, there is also a detection method using a special chip for battery power detection. Since the special chip for battery power detection is expensive, the design cost of this detection method is very high.

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