Bosch BAT 430 - Changeover Switch for Battery Temperature; Function Description

1 689 979 996 2012-10-24| Robert Bosch GmbH
Product description | BAT 430 | 15 en
3.6 Changeover switch for battery
temperature
Symbol Functions
Battery temperature warm (> 15 °C)
Battery temperature cold (<15 °C)
3.7 Function description
Figure 2 shows the characteristic charging curve for the
BAT 430.
In phase 1 of the charging process, the charging current
I
1
is approx. 15 % of the battery capacity set on the con-
troller (Fig. 1, Pos. 8). The green LED flashes rapidly.
When the battery has reached the final charge voltage
U
1
, the charging current I
1
starts to fall. Around 65 % of
the battery capacity has now been reached. The bat-
tery can be used as a starter battery. Phase 1 (main
charging) is complete when the charging current I
1
falls
below approx. 1% of the battery capacity. The battery is
then approx. 97 % charged.
Characteristic charging curve
t
U
I
Phase 1
Phase 2
U
1
Warm = 14,0V/28,0V
U
1
Cold = 14,4V/28,8V
I
1
= 15% of Ah controller
I
2
= 1% of Ah controller
U
2
U
3
= 12,8V/25,6V
Phase 3
Warm = 14,4V/28,8V
Cold = 14,8V/29,6V
U
2
Green LED flashes rapidly
Green LED flashes slowly
Green LED constantly lit
Fig. 2: BAT 430 characteristic charging curve
(schematic representation)
In phase 2, the charging current I
2
is approx. 1 % of
the set battery capacity. The green LED flashes slowly.
Phase 2 is time-controlled and lasts for 65 % of the
main charging time (phase 1). The charge voltage is
limited to U
2
. At the end of phase 2 the green LED is
constantly lit.
Example: With a set battery capacity of 80 Ah, the
charging current I
1
is approx. 12 A and the charging cur-
rent I
2
is approx. 0.8 A.
In phase 3, the charging current is always activated
if the battery is below the voltage U
3
. The charging
current remains active until the charge voltage U
1
is
reached.