Serial-parallel conversion and intelligent charging system for lead-acid storage battery pack

Abstract

The invention discloses a serial-parallel conversion and intelligent charging system for a lead-acid storage battery pack. An intelligent segmental pulse charging technology is provided, the reverse instantaneous discharge function of a storage battery is added, the vulcanization phenomenon of a battery is reduced, the receiving rate of the battery is increased, the charging speed is increased, and the service life of the battery is prolonged. The system consists of a power supply main circuit, a control circuit, a simple keyboard and display circuit, an energy feedback circuit, a battery pack serial-parallel conversion circuit and a temperature measuring circuit, wherein the power supply main circuit consists of a full-bridge inverter circuit consisting of a full-bridge rectifying circuit and an IGBT (Insulated Gate Bipolar Translator), and a full-wave rectifying circuit; a C8051F020 singlechip is taken as the core of the control circuit; the simple keyboard and display circuit can be used for selectively charging on a peak valley; a transformer is taken as the feedback channel of the energy feedback circuit; discharge energy is stored in a filter capacitor. The battery pack serial-parallel conversion circuit consists of a three-pole double-throw switch and a diode, and a series battery pack adapter is used for charging a parallel battery, thereby solving the problem that all batteries cannot be charged due to damage to a single battery in the battery pack. The system is suitable for intelligent charging of electric bicycles in industrial production and civil use.

Description

technical field [0001] The invention is suitable for intelligent charging of industrial production and civil electric bicycles. Background technique [0002] Lead-acid batteries have the advantages of low price, reliable power supply, and stable voltage, so they are widely used in national defense, communications, railways, transportation, and industrial and agricultural production sectors. Most of my country's electric vehicles and backup power batteries are lead-acid batteries, which are different from ordinary batteries. They generally work in a deep charge and discharge state, requiring short charging time, high charging efficiency, and little impact on battery life. At present, most of these lead-acid batteries are charged by constant voltage or constant current. These two methods have great defects in practice: constant voltage charging has a large initial current, so the voltage needs to be reduced, and in the later stage of charging, the voltage is too low to cause ...

AI Technical Summary

Problems solved by technology

These two methods have great defects in practice: constant voltage charging has a large initial current, so the voltage needs to be reduced, and in the later stage of charging, the voltage is too low to cause insufficient charging, and long-term undercharging will cause serious sulfation of the plate; However, the constant current charging is less than the maximum current that the battery can accept at the initial stage of charging, which prolongs the charging cycle, and in the later stage, it exceeds the capacity of the battery to accept the current, and the electric energy cannot be effectively converted into chemical energy, and more of it is consumed as heat energy.

Otherwise, if the original current is used to continue charging, it will only accelerate the reaction of electrolyzed water to precipitate hydrogen and oxygen, increase the temperature rise, fail to increase the charging degree and speed of the battery, and even shorten the life of the battery

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