Dynamis lead-line Technisch handboek - Pagina 9

Blader online of download pdf Technisch handboek voor {categorie_naam} Dynamis lead-line. Dynamis lead-line 16 pagina's. Sealed lead acid batteries

induces low float current and minimum grid corrosion, which are the

requirements for long battery's float service life. Such charging mode, which

is called floating charge, allows batteries to be continuously overcharged all

the year round in order to provide full and stable capacity.

The float charge voltage is 2.25~2.3V/cell at 25°C. However, when the



ambient temperature is too high or too low, the above voltage setting may

induce either too high side reaction rates or not enough charge. Therefore,

the float voltage is suggested to change with temperature, and the

compensation coefficient is -3.0mV/°C/cell, or as the following table:

4.3 Charging methods for cyclic use batteries



The cycle life of batteries is influenced by the following factors: the

charging mode, the battery's temperature, the battery's charging frequency,

and the depth of discharge. Proper charging mode is the most important

factor affecting battery's cycle life.



The charging voltage for the valve regulated lead acid battery should not be

larger than the gassing voltage, i.e., 2.4~2.5V/cell. The gassing voltage

varies with temperature, and is decreased as the temperature is increased. Its

temperature coefficient is -5.0mV/°C /cell, or as the following table:



The most effective charging method for VRLA battery is the constant

voltage (CV) charging mode. For the fully discharged (100%DOD) battery,

for example, it may be charged at 2.4 ~ 2.5V/cell, with the highest possible

current limit, in about 16 hours. For the 50% discharged battery, it may be

charged in 8 to 10 hours using a CV of 2.4 ~ 2.5V/cell.



The popular charging method for VRLA battery is the constant current/

constant voltage (CICV) charging mode. In the first stage, the constant

current (0.1C~0.3C) charging is performed before reaching the voltage limit.

DYNAMIS Batterien GmbH

Tel. +49 7735 93669-0

Brühlstr. 15 D-78465 Dettingen / Konstanz

Fax +49 7735 93669-91

www.dynamis-batterien.de

04.12.2006

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