Dynamis lead-line Manual técnico - Página 10
Navegue en línea o descargue pdf Manual técnico para Accesorios para cámaras Dynamis lead-line. Dynamis lead-line 16 páginas. Sealed lead acid batteries
Imprimir páginaThe above charging mode needs long enough time to fully charge the battery.
However, for charging the electric vehicle battery system with limited time,
the CICV charging mode may sometimes not be able to fully charge the
battery. If one battery is not fully charged in a long string of batteries, that
battery will have faster degradation and then cause a capacity loss of the
long string after many cycles of deep discharge. Such result comes from the
little differences in charging efficiency among different cells. In the constant
voltage charging stage, the current density is gradually decreased to a very
small value; it is difficult to allow all cells to have the same amount of
charge unless charging with long enough time. In discharge, all cells should
deliver the same amount of charge. In consequence, the lower capacity cells
will experience deeper discharge and faster degradation.
A three-stages charging mode is introduced for long string and deep
discharge cyclic applications, which would allow every cell to be fully
charged in short duration. The first two steps are the same as the CICV
method, with the modification that the constant current should be larger than
0.6CA and may be as high as 2CA for some electric vehicle battery
applications. The constant voltage step may be lasted for 1 to 3 hours with
voltage limit of 2.4~2.5V/cell. A third stage is added and it is the constant
current charging with current density smaller than 10-hour rate (10-hour to
40-hour rate), and with duration limited to 1 to 2 hours. In this third stage,
there is no voltage ceiling, although the cell voltage will always be finally
flattened around 2.65 ~ 2.75V/cell. The voltage of the final stage may seem
too high, however, with the small current and short duration restriction, the
negative effect on the battery is minimized.
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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