Intelligent charging system of lead acid storage battery of electric automobile

Abstract

The invention provides an intelligent charging system of lead acid storage battery of an electric automobile. The system comprises a power conversion unit, a charging and discharging unit, a parameteracquisition unit, an auxiliary power supply unit, an isolation unit, a main controller unit, a CAN port unit, a display unit, an alarm unit and a fan heat radiation unit. According to the invention,by use of a novel charging control strategy in which the staged determination of the current and the positive and negative pulse are combined, and by use of the single-chip microcomputer digital PI control technology and the highly-efficient and low-loss DC-DC conversion circuit, the charging speed is remarkably increased; charging is quite safe; the temperature rise of the battery is small; effects on capacity and service lifetime of the storage battery are reduced; and by using the single-chip microcomputer which is low in cost to replace an expensive power supply to manage the IC, the intelligent monitoring and intelligent management of the storage battery are achieved.

Description

technical field [0001] The invention relates to the technical field of battery charging for electric vehicles, in particular to an intelligent charging system for lead-acid batteries of electric vehicles. Background technique [0002] With the continuous consumption of petroleum energy, electric vehicles have been researched and promoted by countries all over the world because of their energy-saving and environmental protection features. However, power batteries have always been the biggest bottleneck restricting the development of electric vehicles. Valve-regulated maintenance-free lead-acid battery (VRLA) has become the main power equipment of electric vehicles due to its advantages of low manufacturing cost, large capacity and stable voltage. However, if the battery is used improperly, its life will be greatly shortened. After research, it is found that the charging process has the greatest impact on battery life, and the discharging process has relatively little impact...

AI Technical Summary

Problems solved by technology

[0003] The traditional charging method is to increase the charging current to achieve the purpose of fast charging, but charging with a large current will inevitably lead to battery overcurrent, overtemperature, plate polarization and other phenomena, which will seriously affect the life of the battery

If you charge slowly with a small current, although the impact on battery life is small, the charging time will be relatively prolonged

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