Direct-current power source intelligent charging control method based on lithium battery

Abstract

The invention provides a direct-current power source intelligent charging control method based on a lithium battery and belongs to the field of battery charging control. The direct-current power source intelligent charging control method based on the lithium battery comprises the steps of defining basic discourse domains and fuzzy sets of battery end voltage variation X1, charge state variation X2 and charging control output Y1, carrying out assignments on the battery end voltage variation X1 and the charge state variation X2, setting up a fuzzy rule library, using a 'maximum-minimum' composition algorithm to obtain an input-output fuzzy reasoning relation, carrying out defuzzification through a centroid method, and inquiring a fuzzy query table according to fuzzy control to obtain an actual output value of the charging control output Y1 of the battery. The direct-current power source intelligent charging control method based on the lithium battery can accurately estimate a charging state of the battery in real time, and achieves quick and safe charging.

Description

technical field [0001] The invention relates to the field of battery charging control, in particular to a DC power charging control method for a lithium battery. Background technique [0002] The existing substation DC power supply mostly uses lead-acid batteries, which have problems such as short cycle life, high temperature influence, and serious pollution during operation, which makes the maintenance cost of the power station higher and affects the efficiency of the power station. Lithium batteries have been widely used due to their large input and output power, wide operating temperature range, no memory effect, small size, maintenance-free, and environmental friendliness. The DC power supply of substations based on lithium batteries will effectively improve the operation and maintenance efficiency of integrated power supplies , reduce substation maintenance costs, and improve the economy of the integrated power system. [0003] At present, the charging of lithium batte...

AI Technical Summary

Problems solved by technology

The advantage of this charging method is that it is simple to control and easy to implement. However, the external voltage of the battery cannot fully reflect the state of charge of the battery. Lead to severe overcharge of some single cells in the battery pack, reducing the service life of the battery

The charging method based on the battery state of charge can effectively solve the above problems, but the existing state of charge (State of Charge) estimation accuracy is not enough, which affects the effect of this charging method

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