start-/stop-system and the battery - Berner Fachhochschule

35
30
25
capacity [Ah]
20
15
compressed battery
10
5
0
0 20 40 60 80 100 120 140 160 180
programme number
Figure 5: This diagram shows the (poor) result with a conventional battery (with pocket-type
separators) and a charge voltage of 15 V, at left, and the (much better) result of the valve regulated
battery with glass mat separators.
The compressed VRLA-battery achieved more programmes than the uncompressed battery.
Half-battery voltages [V]
9
8
7
6
5
4
3
cells 1-3
cells 4-6
2
2
0 20 40 60 80 100 120 140
5
4
3
2
1
0
1
Difference of half-battery voltages [V]
l
time [h]
Figure 6: Comparison of the half-battery voltages. The difference between the two half-cell voltages
(lower curve) increases drastically at the end of life.