printable version
Accumulator battery
Battery Specifications
Overview The battery is designed to start the motor and supply the consumers with the engine off when the generator does not produce electricity. Maintenance maintenance-free battery is to maintain the body and its terminals clean. In such a battery is not required to refill the distilled water. The battery is completely sealed, except for a small vent holes in the lid. In these batteries no antimony, have harmful effects on the plate, and the housing cover is installed separator, electrolyte and absorbent pair then returns it to the battery banks. As a result of the evaporation of water is eliminated, leading to a decrease in the level of the electrolyte. As a result of maintaining a stable level of the electrolyte of the battery service life is substantially increased. In the case of maintenance-free batteries it is possible to check the status of only the voltmeter. In batteries with built-in indicator of the state of charge of the battery status is determined by the color of the indicator. Green color of the indicator corresponds to a fully charged battery, the black color of the indicator indicates the need for charging batteries, light or pale yellow color of the indicator indicates the insufficient level of the electrolyte in the battery.
The processes occurring in the battery Active substance in a lead-acid battery are lead oxide (PbO2) on the positive plates, a highly porous sponge-like lead (Pb) on the negative plates and an electrolyte (an aqueous solution of sulfuric acid), which is also the conductor of ions. Battery plates allow for typical voltages to the electrolyte, and their sum forms the voltage of the electrochemical cell (battery banks). At rest, the voltage of each electrochemical cell is approximately equal to 2, it is increased during charging and reduced during discharging. Upon discharge of the electrochemical cell positive and negative plates, interacting with sulfuric acid in the electrolyte to form lead sulfate. The electrolyte ions gives SO4, and its density decreases. When charging active mass PbO2 and Pb recovered from the lead sulphate. If the charging voltage is applied to the plates of the battery after the full charge of electrochemical cells, there is only the electrolytic decomposition of water at which oxygen is generated at the positive plates and hydrogen on the negative plate, which leads to a "boil" the battery. The density of the electrolyte can be used as an indication of state of charge of the battery.
Characteristics Battery Voltage and capacitance. Battery capacity is estimated in ampere-hours (Ah). The nominal capacity of the battery - it is the current that a battery can deliver for 20 hours at a constant discharge current until the cutoff voltage, 1.75 V on each bank. But in practice, calculated on only 2/3 of said vessel, and in an older battery should be taken into account only half capacity. Controlling the discharge current in the cold state. The strength of the current, which can give the battery at a temperature of -18 ?� C (engine cold start in the winter).
Effect of temperature on the properties of the battery With increasing degree of discharge of the battery electrolyte density decreases proportionally, which leads to an increase its freezing point. In winter, the battery has to particularly heavy loads. Moreover, at low temperature gives the battery when starting the engine only a part of the power available to it at a positive temperature. Therefore, it is recommended before the start of the winter season to check the battery and if necessary, then charged her.
The service life of the battery In the life of the battery affects a large number of different factors: - Fastening of the battery, as arising from the movement vibrations lead to the destruction of the lead plates: - The level of the electrolyte, which must not fall below the mark at which laid bare the plate; - Charge the battery, recharging it excludes. The average service life of the battery - three or four years.
Visual inspection of battery Make sure the ignition is switched off and all electrical consumers. Disconnect the battery starting with the negative terminal. Remove the battery from the vehicle.
A WARNING To protect your hands from the electrolyte is necessary to ensure that the casing of the battery had no cracks and leaks electrolyte. When removing the battery, use the special insulating gloves. |
Check the battery bracket for damage caused by leakage from the battery. Otherwise, clean the surface with a stiff brush and wipe with a cloth soaked in a solution of baking soda in a clean warm water. The same solution wipe the upper part of the battery. Check the casing and battery cover for cracks and, if necessary, replace the battery. Clean the battery terminals corresponding cleaner. Clean the inside of the terminal clamps, using the appropriate tool. Replace damaged or old wire and dilapidated terminals. Install the battery in the car. Connect the wires to the battery terminals, making sure that the upper part of the terminal wires is flush with the top of the terminal. Tighten the clamp on cables. Lubricate all joints of the lubricant layer. The inner surfaces of wires and clamps the contact surfaces of the battery terminals can not be lubricated, or may be in breach of contact between the wire clamps and terminals.
A WARNING When charging the battery under the cover of each element forms an explosive gas. Do not smoke near the battery or charge the battery, which was recently charged. Disconnect the wires from terminal charges the battery after turning off the charger, as in places open circuit under load a spark occurs. Hold the battery with the open stoppers away from the fire. |
Check the electrolyte level in the battery Battery under normal operating conditions of a vehicle requires almost no maintenance. At high ambient temperatures it is recommended from time to time to check the level and density of the electrolyte in the battery. You should check the electrolyte level and battery charge. It must always be between the ?�MIN?� and ?�MAX" marked on the longitudinal side of the battery. The electrolyte should reach at least the lower of the two housing supported on the battery label and at the same time, should completely cover the upper part of the lead plates. By reducing the level of the electrolyte should be topped up to the relevant banks distilled water up to the mark "MAX". Remove the plug from the battery cans. Some batteries are equipped with special plugs. Use a screwdriver to pry the bottom part of the plug and remove the "head" plugs. The lower part of the plug, remove the pliers. When properly charged battery, add distilled water to the top mark ("MAX") or 15 mm above the top edge of the lead plates. When the battery is discharged greatly add distilled water so that it covered only the upper part of the plate. When charging the battery electrolyte level will increase significantly. After charging the battery, add distilled water to the top mark. The amount of water must be topped up very accurately dosed, otherwise the battery banks will be crowded. Battery with elevated electrolyte "boils" acid protrudes through the plug and cause corrosion and the formation of acid crystals on the surfaces of the battery and its mounting bracket.
The use of distilled water for topping up battery banks The banks of the battery never finished electrolyte or top up the battery acid, but only demineralized (ion exchange) water or a so-called distilled water. Tap, rainwater, bottled water contains conductive salts and other minerals, which destroy the battery plates.
Caring for the battery terminals To clean the terminals, disconnect them from the battery and strip wire brush. Strongly oxidized terminals should process a toothbrush coated with a solution of bicarbonate of soda. Rinse with warm water and baking soda oxide crystals or treated with a special tool. Water, dirt or cleaning agents should not be any way to get through the vent holes in the battery banks. When removing caps, check whether they are free from dirt air vents, otherwise clean them. Apply a protective lubricant to the upper portion of the battery terminals and the outer surface of the probe wires. The inner surfaces of tips of wires and the contact surface of the battery terminals can not be lubricated, or may be in breach of contact between the tips of wires and terminals.,
Checking the state of charge of the battery Check the density of the electrolyte in the battery must be periodically carried out in order to determine the load capacity of the battery. The efficiency of maintenance-free batteries can only be checked with a voltmeter. The charge level of maintenance-free batteries is determined by the color of the indicator. Green color of the indicator corresponds to full charge, black indicates the need for charging, blue indicates a low level of electrolyte in the battery. Checking density hydrometer held. Remove the plug from the battery cans. Type in the hydrometer as the electrolyte to the measuring float freely floated in it. On a scale on the float to determine the density of the electrolyte. The numbers on the scale are as follows: 1.28 kg / l - the battery is fully harnessed; 1.20 kg / l - the battery is charged by half; 1.12 kg / l - the battery is discharged.
A WARNING At the same low density of the electrolyte in all banks battery sufficiently charged battery. If only one bank discharged battery, then the battery is defective and should be checked by. |
Charging the battery In normal use, battery does not require recharging from an external source. Only after prolonged simply requires recharging it. Charging may be necessary when using a vehicle mainly for short trips in the dark. Otherwise, the need to recharge the battery indicates malfunction of the battery or its charging circuit. Connecting the charger Disconnect the positive and negative terminals of the battery. Using a conventional battery charger is not necessary to disconnect it from the electrical wiring of the car, but you should turn off the ignition and all electrical and leave the hood open. In any case, you must follow the instructions of the manufacturer of the charger. Plugs can not be removed from the battery, as formed by charging gas escapes through its ventilation openings. Charge a constant current equal to 1/10 of the battery capacity (e.g., 4.8 A battery 48 Ah) or in accordance with instructions on the charger. If the electrolyte density is not increased in the last 2 hours of charging, the battery is charged. When charging batteries, an explosive gas mixture is released. If charging is carried out by high currents, it is necessary to ensure good ventilation of the room in which the charged battery. When charging the battery is prohibited to use open flame devices iskrovydeleniem, open and flammable devices lighting smoke. Avoid sparking when handling cables and electrical devices. Never short the battery terminals directly - possible injury due to heavy arcing.
Check the battery under load Upon discharge of the battery for 15 with a current equal to half the maximum inrush current, battery voltage depending on the ambient temperature should be less than the voltage given in the Table. 10.3.
Table 10.3 The battery voltage after the discharge for 15 sec a current equal to half of the maximum starting current dependent on the ambient temperature If the voltage does not correspond to the desired value, perform a check and if the situation persists, charge the battery again. If the battery voltage (left for 2 hours after recharging) 12.5 V and the voltage after testing under the load exceeds the reference value, a battery can be used.
Replacing the wiring for connecting the battery Periodically inspect the entire length of the wires connected to the battery for damage, destroying the integrity of the insulation and corrosion. Poor connection wires, which increases the contact resistance can be expressed in a reduction of the current flowing through the starter, which could create difficulties when starting the engine. Check the clips on the ends of the wires for corrosion. The presence of white flakes under the insulation indicates that the wire is exposed to corrosion and must be replaced. Check the terminals for deformation, which reduces the contact patch with the battery terminals. When replacing the wires to disconnect the wire from the negative terminal of the battery, take him aside and isolate to prevent accidental connection to the battery. Even if only necessary to replace the wire for connection to the positive terminal, it is first necessary to disconnect the wire from the negative battery terminal. After disconnecting the battery cable, disconnect them from opposite sides. Disconnect the wires from the traction relay of a starter, fuse and "mass" wire on the body and the power unit. Label the wires to ensure correct installation of new wires. When replacing wires use new wire section and length equal to the length of the section and replaced. "Positive" wires have a larger cross section (diameter) and "negative" less positive wires. Wire brush, clean the threaded contact pulling the starter relay. To prevent corrosion, apply a thin layer of petroleum jelly on battery terminals. Attach the wires to the new terminals for connection to the battery terminals and secure them with nuts and bolts tightened very securely. Before connecting wires to the new battery, make sure that there will be no tension. After installation of new cables, connect the wire of "weight" to the negative terminal of the battery.
Starting with an external power source Install the charged battery from the vehicle as close as possible to his car to batteries were almost there, but do not allow the vehicles come in contact. Shut down all secondary consumers. First connect one end of the cable to the positive terminal of the discharged battery, then the other end of the same cable - to the positive terminal of the auxiliary battery. Then connect one end of the second wire to the negative terminal of the auxiliary battery, and then the other end - a "mass" terminal, a fixed point of the metal (for example, engine mount). Do not connect a wire from the negative terminal of the auxiliary battery to the negative terminal of discharged battery. Start up the engine of the car - the "donor" with the increased speed of the crankshaft to the generator started to produce power. If the engine does not let just let the starter cool down time. Then start up the engine of the car - a "donor", which will charge a little discharged battery. When removing the auxiliary wires to disconnect the wire from the negative terminal of the charged auxiliary battery.
|