Nowadays, the battery is an indispensable part of the car and can be divided into traditional lead-acid batteries and maintenance-free batteries. Since the battery uses lead-calcium alloy as the grid, the amount of water decomposition generated during charging is small, the evaporation of water is also low, and the sealed structure of the outer casing is used, and the sulfuric acid gas released is also small, so it is compared with the conventional battery. It has the advantages of no need to add any liquid, the wiring pile head, and long storage time. Many people know the role and use of batteries, but some methods are wrong. Here are four different ways to use the battery.
1. Battery serial mixing
In the use of batteries, there are occasions when new and old batteries are used in series. However, this practice will shorten the service life of the battery. Because there are many chemical reaction substances in the new battery, the terminal voltage is high, and the internal resistance is small (the internal resistance of the new 12V battery is only 0.015-0.018Ω); while the old battery terminal voltage is lower, the internal resistance is larger (12V old battery The internal resistance is above 0.085Ω). If the new and old batteries are mixed in series, then in the state of charge, the charging voltage at both ends of the old battery will be higher than the charging voltage at both ends of the new battery, resulting in the new battery not being fully charged and the old battery charging being too high; in the discharged state Because the charge capacity of the new battery is larger than the charge capacity of the old battery, the result is that the old battery is over-discharged, and even the old battery is reversed. Therefore, the battery must not be mixed with new and old.
2. Diesel battery battery cell damage continues to be used
Because diesel engine compression is relatively large, the required starting torque is also large, so the general diesel engine is started with 24V voltage to increase the specific power of the starter, but the generator and the whole vehicle electrical equipment still use 12V voltage, so the diesel vehicle The circuit is equipped with a voltage conversion switch. When starting, the transfer switch connects two 12V batteries in series and supplies power at 24V. In the non-starting state, the transfer switch restores the two batteries to parallel operation to meet the needs of 12V voltage. However, when one of the batteries is damaged, some drivers will short-circuit them and continue to use them. This will cause large discharge current and charging current due to unequal voltages at the two battery terminals, resulting in damage to the battery and generator. Therefore, the battery compartment on the diesel vehicle should be replaced or repaired immediately after the battery compartment is damaged, and the single battery should not be short-circuited and continue to be used.
3. The battery charge capacity does not match the engine
Reasonable selection of the charge capacity of the battery according to the type of engine and the conditions of use is one of the important ways to improve the economy of the battery and prolong its service life. When the starter starts the engine, the battery output current is very large, generally 150A-200A, and the output current is as high as 250A-300A when starting at low temperature (-10°C). If the charge capacity of the battery does not match the engine and the charge capacity of the battery is too small, when the starting resistance is large, the battery with a small charge capacity will accelerate the reaction of the active material with sulfuric acid per unit time under the condition of severe discharge, so that the temperature of the battery rises. High, the plate is bent due to overload, resulting in a large amount of active material falling off, the early damage of the plate, so that the battery life is greatly shortened. If the charge capacity of the battery is too large, the above problem does not occur, but the active material cannot be fully utilized, and the battery economy is lowered. Therefore, the charge capacity of the battery must match the engine. Usually, the choice of battery charge capacity should be based on the starter power, voltage and the load of the electrical equipment.
4. Battery parallel mixing
Some drivers use a fully charged battery in parallel when starting the engine because the original battery is not fully charged. In fact, a fully-charged battery in parallel will charge a battery with insufficient storage current with a large charging current, which will easily cause the active material of the plate to fall off and affect its service life. At the same time, after the batteries are connected in parallel, it cannot provide a large starting current to the starter, which is more detrimental to the starting of the engine. The correct method should be to remove the battery with insufficient storage, replace it with a fully charged battery, and then start the engine.