Honda CB160 Shop Manual page 101

5. 4 POWER SOURCE CIRCUIT
97
Electrical
An electrical container constructed of suterin is em-
ployed. Hence, it is difficult to inspect the plates
or electrolyte from the exterior portion of the con-
tainer.
After the coupled electrode plate group is inserted
into the electrical container, the container cover is
fitted and tightly sealed with a synthetic resin adhesive.
To the electrode plote which protrudes from the con-
tainer cover, an electrode connector is fitted with
pitch and synthetic resin applied to the electrode
plates to prevent vibration and electrolyte leakage.
{Refer to Fig. 5. 59)
When additional loads, such as lamps, etc., are
connected to the battery terminals, discharge occurs.
As discharge takes place, the elements of the elec-
trode plates (lead peroxide, sponge lead, etc.) are
gradually transformed to sulfate. The specific gravity
of the electrolyte (dilute sulfuric acid) is gradually
reduced and terminal voltage drops. Since reduction
of specific gravity corresponds to the degree of dis-
charge, if the initial specific gravity is known (specific
gravity upon complete charge is 1.260 and that at
complete discharge is 1.10), the extent of discharge
and amount of remaining electricity is determined by
the difference in specific gravity.
(Refer to Fig.
5.
60)
The specific gravity of dilute sulfuric acid changes
according to temperature.
It
also changes in accord-
ance to battery type ; however, dilute sulfuric acid
with a specific gravity of
l
.260 upon conversion at
a standard temperature of 20°C is employed. If
reverse current is applied to a battery from which
discharge occurred, the battery is charged and, as
charging occurs, lead sulfate produced by discharging
returns to its original state (lead peroxide, sponge
lead, etc.) and the specific gravity of the dilute
sulfuric acid gradually increases ; terminal voltage
correspondingly increases. (Refer to Fig.
5.
61)
II.
Battery charging, discharging ratio and
capacity (charging ratio)
Battery capacity is the amount of electricity which
is discharged from a completely charged battery until
terminal voltage drops to a specified voltage (which
is designated by JIS as an average 1. 7 5 V per cell).
To express this, the ampere-hour (AH) is used and dis-
charged current is multiplied by discharge hours.
fig.
5. 59 Battery components
~
1.30
0
c
1.26
~
::'. 122
0
~
1.18
>
<{
t,
1.14
<-·----··---··-----i-----··--"
u
~ 1./0
~--'--~~~--'--~FULLY DISCHARGED
l E
!OO;t;
fJJ
60 40 20 0
vi
CA PACI TY OF BA TTEIY
Fig. 5. 60 Graph of specific gravity and electrical
capacity
ELECTROLYTE
NEGATIVE
POSITIVE
LEAD DI-OXIDE
DILUTE SULPHULIC ACID SPONGY LEAD
Pb02
+
2H,SO,
+
Pb
DISCHARGE
11
CHARGE
PbSO,
+
2H,O
+
PbSO,
fig. 5. 61 Reversible reaction