Page 1179 - Workshop Manual - Aumark (BJ1051)

53-3
Battery-Battery

(a). Function of plate grill: support the active material; conduct the current and make the current
distributed evenly.
(b). There are two kinds of plate grill structures: straight line type and radiation type; modern
vehicle adopts radiation type separator in order to decrease the inside resistance of battery
and improve the starting performance.

(c). Normal the material of plate grill is lead-stibium alloy; stibium can increase the mechanical
strength and casting performance. But stibium will speed up the precipitation of hydrogen
and speedup the consumption of electrolyte, and also, it can cause battery to discharge
automatically and separator corrosion; thus the service life of battery will be shortened.
Nowadays, lead- low stibium alloy grill or lead-calcium- tin alloy grill are used more and
for the maintenance free battery, normally it uses lead-calcium alloy.
2. Separator
(a). Battery separator is composed of micro-hole rubber, plastic glass fiber etc.. Its function is:
• Prevent positive/negative plate from short-circuit.
• Make the cation and anion inside of electrolyte pass smoothly.
• Make the falling off of active material on positive/negative plate slow; prevent the
positive/negative plate from damage causing by vibration. 53
(b). The separator used by battery must have the following characteristics: high hole rate, small
hole diameter, anti-acid, no harmful impurity produced, with certain strength, small
resistance inside of electrolyte and with stable chemical performance.
3. Electrolyte
(a). Main function of electrolyte is conducting the current and attending the electrochemical
reaction.
(b). Electrolyte is made of concentrated sulfuric acid and purified water; purity and density of
the electrolyte has important influence to the capacity and service life of the battery.
(c). Density of electrolyte inside of vehicle battery is 1.280 ± 0.005 g / cm3 （25 ℃）thin sulfuric acid.
4. Battery case and cover
The case and cover of battery is the container to store positive/negative palate and electrolyte;
it is mainly made of plastic and rubber material.
5. blow-off cock
(a). blow-off cock is made of plastic material and it seals the battery; it prevent air coming in
and keep the pole plates from oxidation.
(b). Penetrate the blind hole on vent cap by iron nail before using to guarantee the air venting.
6. Others
There are plate bridge, terminal, pole and level indicator etc. on the battery except for the
above main parts.

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