Grey system prediction theory-based nondestructive fast charging method for lead-acid battery

Abstract

A grey system prediction theory-based nondestructive fast charging method for lead-acid battery belongs to the technical field of lead-acid battery charging. The method comprises the following steps of: sampling a lead-acid battery charging terminal voltage U(O) (K), a lead-acid battery charging current I (O) (K), and a lead-acid battery charging temperature T (O) (K) continuously and periodically during charge of the lead-acid battery; performing grey association analysis on the continuously sampled data of the lead-acid battery charging terminal voltage U(O) (K), the lead-acid battery charging current I (O) (K), and the lead-acid battery charging temperature T (O) (K) by taking the charging current I (O) (K) as a reference sequence of grey association analysis, and ensuring that the association degree of the lead-acid battery charging terminal voltage U(O) (K), the lead-acid battery charging temperature T (O) (K), and the lead-acid battery charging current I (O) (K) meets modeling requirements. The data output by a sensor is used for periodical and continuous sampling, a grey dynamic prediction model is established according to a continuously sampled value, and pre-correction for each charging parameter is performed by the model prediction value, so dynamic real-time performance, safety and reliability of the battery charge are guaranteed, a charging speed is improved, and the thermal runaway and the undercharge are prevented simultaneously.

Description

technical field [0001] The invention discloses a non-destructive fast charging method for lead-acid batteries based on gray system prediction theory, belonging to the technical field of lead-acid battery charging. Background technique [0002] The life of lead-acid batteries is often considered a function of materials and design parameters, such as grid alloy and thickness, composition of lead paste, plate thickness, ratio of positive and negative active materials, electrolyte concentration, and discharge rate and depth of discharge, etc. Conditions. Although it is well known that the charging method has a significant impact on the life of the battery, it is regrettable that in recent decades, the standard charging method has hardly changed, that is, constant voltage and constant current combined charging. [0003] In the first stage of this charging method, a relatively high current is used to charge the battery; in the second stage, when the terminal voltage of the battery...

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Problems solved by technology

[0006] 1 Excessive pursuit of speed will lead to excessive initial current, long-term charging will cause the grid to fall off, thermal runaway is more likely to occur, and damage the battery;

[0007] 2. The general temperature correction is adopted in the charging process based on the empirical formula, ignoring the influence of the temperature rise of each cell of the battery. When a single cell fails prematurely, if it is not dealt with in time, the unbalanced charging will reduce the cycle life of the battery;

[0008] 3 Adopt a series of control methods such as fuzzy control and neural network that have high requirements on the micro-control unit and storage unit to design the charger, which increases the manufacturing cost of the charger;

[0009] 4 The most important thing is that both this charging method and the charger wait for the battery gas to be released or the preset voltage before the relevant charging components take action, ignoring the hysteresis of the battery system response

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