Chapter XI Electrical System
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
465
——Initial charge: it is the first charge for dry discharged storage battery before being used. Fill
electrolyte into dry discharge storage battery and rest the battery for 1 to 6 h, and do not start charging
until the liquid temperature lowers below 35°C.For initial charge, the electric current is generally 0.07
C20 A, and after the single cell voltage reaches 2.4 V, cut the electric current in half for subsequent
charging.
——Supplementary charge: it is used for dry charged storage battery of poor dry charging performance
and long storage time, or for storage battery unused for about 1 month after being sufficiently charged
with electrolyte filled. The electric current applied for supplementary charge is 0.1 C20 A, and the
charging time is about 5 h or determined by the storage period.
——Normal charge: it is the charge for storage battery being used after initial charge. In the first stage of
normal charge for automobile storage battery, the electric current applied is 0.1 C20 A, and after
charging of 8 to 12 h till the single cell voltage reaches above 2.4 V, the electric current is cut in half for
the subsequent charging of about 10 hither charge capacity is generally 1.5 times of discharge capacity,
or 1.3 to 1.5 times of rated charge capacity.
——Equalizing charge: it is the sufficient charge for storage battery by means of normal charge and
electric current of 0.035 C20 A in order. When there are even bubbles in storage battery with
temperature increasing, stop charging for 1 h and repeat such operation 3 to 4 times. Single cell can
produce plenty of bubbles. The equalizing charge stops when the storage battery voltage and electrolyte
density tend to be stable.
——Constant-current charge: it is the charge applying constant voltage all through. In the beginning, the
charge current is high and then progressively weakened, and the charge constant voltage is generally
2.3 to 2.4 V. Such charge produces little gas and consumes little water. Therefore, constant-voltage
charge is usually used for seal lead-acid storage battery free from maintenance.
——Quick charge: it is the charge for storage battery applying high electric current and pulse current as
well as intermittent charge with short time discharge. The quick charge applies 1 to 2 times of C20 A high
electric current. The quick charge is implemented by a purpose-made quick charger.
(4) How to judge whether storage battery is sufficiently charged or not
There are plenty of bubbles in a single cell, cell voltage is between 2.6 to 2.8 V and is measured to stay
constant after charging 2 h, and the electrolyte specific gravity reaches 1.280g/cm
3
±0.01g/cm
3
(25°C)
and stays constant after 2 h.
(5) Preparations of charging
The liquid temperature can not exceed 45°C, if not, take measures to lower it down (to reduce charge
current or stop charging or put it in a trough for cooling), and the ventilation should be good, and fire
source be prevented.
(6) Fault diagnosis of lead-acid storage battery
The fault diagnosis methods commonly used for lead-acid storage battery are shown in Table 11-1-5,
11-1-6 and 11-1-7.
Table 11-1-5 Specific gravity measurement
Specific gravity value (25°C)
Judgement
Treatment
Above 1.300
High concentration of electrolyte,
and incorrect filling
Using deionized water to adjust
the specific gravity
1.250~1.280
Good
1.250~1.220
Undercharging
Recharging
