Time-sharing discontinuous voltage-controlled charger for lead-acid battery

Abstract

The invention relates to a time-sharing discontinuous voltage-controlled charger for a lead-acid battery, belonging to electrical and electronic devices. The charger of the invention properly switches the charging condition of the lead-acid battery by period automatic control, thereby preventing over-charging or thermal runaway and achieving the aims of saving energy sources and prolonging the service life of the battery. The charger of the invention is formed by electrically connecting a power supply, a period control device, a duration combined transfer switch, a charging switch driving element and a traditional charging component, wherein the period control device comprises a controllable multi-stage timing circuit; and the traditional charging component is controlled by the charging switch driving element to provide energy corresponding to large current charge, automatic recovery intermission, floating charge and standby charge for the lead-acid battery. The invention adopts a controllable time-sharing principle to supplement the traditional voltage control and temperature control technologies, and is especially suitable for charging batteries of electric vehicles. The best duration of each stage in the process of charging is determined by experimental data and field experience for automatically switching large current charge, intermission recovery, floating charge, standby intermission floating charge and the like for the lead-acid battery.

Description

technical field [0001] The invention relates to a time-sharing and intermittent voltage-controlled charger for lead-acid batteries, which is automatically controlled by time intervals and appropriately switches the charging conditions of lead-acid batteries, thereby preventing overcharging or thermal runaway, and achieving the goals of energy saving and battery life extension. It belongs to electrical and electronic facilities. Background technique [0002] Lead-acid batteries are still the main energy source for high-power mobile power supply so far, and under-power and overcharge are important reasons for the early failure and scrapping of such batteries. The existing technology adopts the mode of voltage control + temperature control for lead-acid batteries, and only uses the mode of voltage control in auto repair factories, mines and households (motorcycles, battery lights, etc.) to switch between the high current and floating charging conditions of charging . This can...

AI Technical Summary

Problems solved by technology

The charging effect for new batteries, spare or low-power output batteries can still meet the requirements, but for lead-acid batteries in other conditions, it will cause capacity drop, electro-hydraulic evaporation, thermal runaway or overcharging, and even damage the battery and scrap it

[0003] Tests and a large number of practical applications on old batteries, maintenance-free lead-acid batteries, etc. have proved that: (1) It is difficult to reach the specified terminal voltage by continuous high-current charging, thus making the "voltage control" invalid; long-term high-current charging not only It wastes energy, and makes the battery heat up beyond the standard, accelerates the evaporation of electro-hydraulic, and the plate bends and short-circuits

(2) Continuous floating charging not only wastes energy, but also causes overoxidation of the reaction layer of the plate, resulting in a significant drop in output power

The electro-hydraulic temperature of the lead-acid battery is too high, which will cause the negative plate to vulcanize, resulting in capacity loss and shortened life

After the electro-hydraulic evaporates, the acid concentration increases, which leads to the accelerated self-discharge of the battery and the corrosion of the grid, causing the lead dioxide to loosen and fall off.

[0005] On the one hand, the existing technology controls switching by battery terminal voltage and long-term continuous floating charging, which causes a lot of unnecessary waste of electric energy; on the other hand, the temperature control switching lags behind the chemical reaction, and the voltage control switching often fails, resulting in a large The battery is scrapped ahead of time

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