Intelligent charge control method for Ni-MH power accumulator set

Abstract

The invention relates to a control method for the intelligent charging of a ni-mh power accumulator battery, which is a power accumulator battery charging control method, belonging to the technical field of power accumulator battery. The control method of the invention is mainly characterized in that online measurement of battery essential resistance, voltage, current and temperature of the battery is adopted, the online diagnosis of the battery pack, the online calculation of the carrying capacity SOC and the safety state monitoring of the battery are carried out, and the four processes as follows are sequentially carried out on the basis of the online measurement: pre-charging, pulse-quick charging by adding negative pulse, supplementary charging and trickle charging; therefore, the control method of the invention leads the charging efficiency to be the highest and the charging time to be the shortest, is beneficial to prolonging the service life of the battery at the same time, avoids the damage of the battery caused by excessively high over-heat and internal pressure during the charging process, and realizes the automatic intelligent optimum safety charging control with unmanned watching.

Description

technical field [0001] The invention relates to an intelligent charging control method for a nickel-metal hydride power storage battery pack, which is a charging control method for a power storage battery and belongs to the technical field of power storage batteries Background technique [0002] Ni-MH power battery has many excellent characteristics such as no pollution, high specific energy, high power, fast charging and discharging, and durability. Compared with lead-acid batteries, it has high specific energy, light weight, small size, long cycle life, and environmental protection. Features, has a very broad market demand. [0003] Among the many factors affecting nickel-metal hydride power batteries, the charging control method is the factor that has the greatest impact on its life and performance, among which the control of charging and discharging current, internal pressure and temperature during charging is particularly important. At present, the basic charging metho...

AI Technical Summary

Problems solved by technology

Its disadvantages are: (1) The constant current charging method keeps the current constant during the charging period, and the charging efficiency of the battery is high when the battery power is low, allowing high-rate charging, and the charging efficiency is low when the battery power is high. Small rate charging is required, so the constant current charging method cannot adapt to the dynamic requirements of the battery for charging current, which is likely to cause long charging time, low charging efficiency, overcharging heat, internal pressure rise and damage the battery, and because the voltage rises in the later stage of charging It needs to be designed according to high power, resulting in high manufacturing cost; (2) The constant voltage and current limiting charging method keeps the voltage constant during charging, limits the charging current when the battery power is low, and limits the charging voltage when the battery power is high, thus causing the battery to be charged during charging. Insufficient charging in the early stage of use, and a significant drop in capacity in the later stage

(4) The pulse charging method is first to charge the battery with a pulse current, and then let the battery stop charging for a period of time, so that the cycle is repeated. This method uses the gap between the charging pulses to eliminate or reduce the polarization and internal pressure inside the battery. This method Generally used for fast charging, it is easy to cause the battery to heat up and affect the battery life

In addition, the current Ni-MH power battery charging control methods have the following general deficiencies: the lack of adaptive high-precision online estimation of the battery power to be recharged, especially the estimation of the initial power, and the actual initial charging current and its control during the charging process The history is closely related to this; the charging process control parameters lack real-time optimal coordination with the state of the battery being charged, so the optimal charging process control cannot be truly realized

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