Lead acid battery charging method and device

Abstract

The invention relates to a lead acid battery charging method and a device. The lead acid battery charging device charges a lead acid battery, wherein a constant current pulse power is used for charging the lead acid battery; the pulse current Ip of the constant current pulse power is larger than the discharging current If of the lead acid battery when a backup power works; moreover, the pulse current Ip is more than 0.1 C; and C is the nominal capacity of the lead acid battery. The lead acid battery charging method comprises the steps of adopting the pulse current to charge, and adjusting theduty factor of the pulse current according to the voltage of the battery to realize the average charging current variation at different charging periods, and reduce the water loss in the charging process. Meanwhile, charging under a large enough pulse current can eliminate the acid corrosion and oxide precipitate occurring at the bottom part of the battery caused by the long term fixation of the lead acid battery. The invention adopts the form of regularly supplementing to replace the traditional floating charging at constant voltage, which reduces the phenomena caused by long term floating charging such as water loss of the lead acid battery, unit cell unbalance of battery and the like, and prolongs the service life of the lead acid battery.

Description

technical field [0001] The invention relates to the field of battery charging, in particular to a charging method and device for a backup power lead-acid battery. technical background: [0002] As the main energy storage device for backup power, lead-acid batteries are widely used in important equipment, facilities or buildings in various industries. [0003] Since 1972, American scientist Mas proposed the famous Mas three laws at the Second World Electric Vehicle Annual Conference, the charging of lead-acid batteries has been based on this. Whether it is the early constant voltage charging, the recent three-stage charging, or the pulse charging whose theory is not perfect enough, they are all based on Maas's three laws. Mas's three laws reveal the acceptability of lead-acid batteries when charging, but they cannot solve the problem of gradual increase of sulfuric acid concentration inside the battery under long-term floating charging, unbalanced cell capacity caused by une...

AI Technical Summary

Problems solved by technology

Mas's three laws reveal the acceptability of lead-acid batteries when charging, but they cannot solve the problem of gradual increase of sulfuric acid concentration inside the battery under long-term floating charging, unbalanced cell capacity caused by uneven self-discharge inside the lead-acid battery, and sulfuric acid. The bottom acid corrosion formed by sinking (commonly known as rotten root)

Images