Method for analyzing and calculating remaining power value of lithium ion battery in real time

Abstract

The invention belongs to the technical field of lithium ion batteries and in particular relates to a method for analyzing and calculating a remaining power value of a lithium ion battery in real time. The method comprises the following steps of: fully charging the battery, recording a discharge curve of battery voltage relative to discharge time under different currents, and acquiring a data comparison table of output current, the battery voltage and the discharge time; translating the data comparison table into a three-dimensional array of the discharge time, the battery voltage and power display degree, and storing the three-dimensional array into a singlechip; and in the actual discharge process, comparing and analyzing a product which comprises the lithium ion battery according to the three-dimensional array which is stored in the singlechip, and displaying power degree. Compared with the prior art, the method provided by the invention has the advantages that the influence that voltage at two ends of a cell is changed along with the change of load current can be reduced to a large extent, the power display degree can be detailedly and accurately estimated, so requirements of an electronic product which comprises the lithium ion battery on detailed and accurate division of remaining power are met.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a real-time analysis and calculation method for the remaining power value of the lithium-ion battery. Background technique [0002] In the field of lithium-ion battery applications, it is difficult to accurately estimate the power value of the lithium-ion battery itself with a simple method. Because the lithium-ion battery itself has internal resistance, when the external discharge current is different, the voltage at both ends of the battery will change significantly. Therefore, it is very inaccurate to judge the battery power only by the battery voltage, and the voltage at both ends of a single battery itself cannot fully reflect the true value of the power. [0003] At present, consumer electronics products such as mobile power supplies that contain lithium-ion batteries display the remaining power of the lithium-ion battery. Most of the methods are ...

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Problems solved by technology

[0007] The purpose of the present invention is to aim at the deficiencies of the prior art, and to provide a battery that is more in line with the discharge law of the lithium-ion battery, can largely reduce the influence of the change of the voltage at both ends of the battery cell with the change of the load current, and can be finer. , more accurately estimate the remaining power value of the lithium-ion battery at the level of power display, real-time analysis and calculation method, to meet the requirements for products with finer remaining power grids and more accurate electronic products containing lithium-ion batteries, so as to overcome the problems in the prior art The method used to calculate the remaining capacity of the battery cannot accurately judge the battery power, and can only be used for products containing lithium-ion batteries with simple functions and low requirements.

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