Lithium ion battery consistency matching method and system

Abstract

The invention discloses lithium ion battery consistency matching method and system, wherein the lithium ion battery consistency matching method comprises the following steps of: A, marking at least one battery, setting the battery on a corresponding test channel and inputting the mark in a database; B, respectively sending two alternating-current pulse signals with different frequencies to the battery and collecting response signals of the battery; C, carrying out data transformation treatment on the collected response signals to obtain Rs, Rct and Rs+Rct of the battery; and D, comparing and screening the differences among the obtained Rs, Rct and Rs+Rct of the battery and inputting battery numbers corresponding to all the screened data into the database. The lithium ion battery consistency matching method provided by the invention is based on the basic electrochemical nature of the battery, so that the operation method is simple, the reliability of test result is high, the method conforms to the practical situation of the battery, the expression is simple and the parameters required by screening are flexible.

Description

technical field [0001] The invention relates to a grouping method, in particular to a consistent grouping method of lithium ion batteries. [0002] The present invention also relates to a system used in the above lithium-ion battery consistent matching method. Background technique [0003] Lithium-ion batteries have become the first choice for power and energy storage batteries due to their high operating voltage, high energy density, small self-discharge, no memory effect, high charge and discharge efficiency, and less environmental pollution. The performance of lithium-ion battery cells, modules, and battery packs is significantly different. From the battery cell to the battery module and then to the battery pack, the performance is significantly attenuated. The main reason for decay mainly comes from the inconsistency between monomers. In fact, during the operation of the vehicle, the battery will not work properly due to inconsistency, which will greatly reduce the ove...

AI Technical Summary

Problems solved by technology

The no-load matching method is the easiest to operate, but it is not accurate

The dynamic voltage matching method is relatively simple, but it only considers the voltage situation when it is loaded, and does not take into account factors such as charging time, load changes, and output capacity, so it is also flawed.

[0008] (4) Sorting according to charging and discharging efficiency: the difficulty of this kind of classification is to decide when the charging ends. good classification

[0009] The advantages of the above sorting methods are simplicity and convenience, but the single sorting parameters cannot fully reflect the performance of the battery, the performance consistency of the sorted battery is not high, and the data accuracy is not enough

Images