The wrong way to maintain the battery
1. Mixed use of batteries in series
In the use of batteries, sometimes new and old batteries are used in series. As everyone knows, this practice will shorten the service life of batteries. . Because there are more chemical reaction substances in the new battery, the terminal voltage is higher, and the internal resistance is small (the internal resistance of the new 12V battery is only 0.015-0.018Q); while the terminal voltage of the old battery is lower and the internal resistance is larger (the 12V old battery’s internal resistance is only 0.015-0.018Q). The internal resistance is above 0.085Q). If the new battery and the old battery are mixed in series, the charging voltage at both ends of the old battery will be higher than the charging voltage at both ends of the new battery in the charging state. As a result, the new battery is not fully charged and the old battery is already charged too high: in the discharged state , Because the charge capacity of the new battery is larger than that of the old battery, the result is that the old battery is over-discharged, and even the old battery is reversed. Therefore, the new and old batteries must not be mixed.
In addition, batteries with different charge capacities cannot be mixed in series, because when two batteries with different charge capacities are used in series, the batteries with small charge capacity tend to be overcharged or discharged, shortening their service life.
2. Ignore the dredging of the vent holes
The battery will produce hydrogen and oxygen during the charge and discharge process, especially when overcharged, the water is electrolyzed to produce a large amount of hydrogen and oxygen. The vent hole on the battery filling hole cover is used to dissipate these gases. If the ventilation holes are ignored, the vent holes will be blocked, and the heat and gas generated during the chemical reaction of the battery will not be dissipated, which will cause the internal temperature and pressure of the battery to continue to rise, and eventually cause the battery to explode. Therefore, in daily maintenance, attention should be paid to dredging the vent holes to prevent dirt from blocking the vent holes.
4. The density of the electrolyte is 'larger than small'
As an important indicator of the degree of battery discharge, the electrolyte density is based on the premise that the original electrolyte density has been determined. Adding electrolytes of different densities only means increasing the density of the original electrolyte. Even if the measured electrolyte density is higher, it does not mean that its discharge degree is low; increasing the electrolyte density can increase the battery terminal voltage and charge capacity. In other words, on the one hand, increasing the electrolyte density can increase the electromotive force of the battery and increase its terminal voltage and charge capacity, but on the other hand, if the electrolyte density is too large, the electrolyte viscosity increases and the internal resistance increases, which reduces its permeability. , On the contrary, the battery terminal voltage and charge capacity will decrease, and the excessive electrolyte density will also cause various problems such as plate vulcanization and corrosion plate, which will reduce the service life of the battery.
5. Ignore the inspection of the electrolyte level.
Check the battery electrolyte level regularly. If the amount of electrolyte is not enough, it will cause the upper part of the electrode plate to contact with the air and cause vulcanization, reducing the charge capacity of the battery and shortening its service life. Generally, check once every half a month in winter. In summer, high-temperature water is easy to evaporate, so check once a week. The height of the electrolyte level is generally 10mm-15mm higher than the electrode protection net. The lower limit is marked, so the electrolyte level only needs to be within the specified range. Although there is no need to add distilled water during use, the height of the electrolyte level should also be checked in conjunction with the regular maintenance of the car. If it does not meet the requirements, it should be adjusted.
6. The electrolyte level is 'higher rather than low'
When some drivers fill the battery with electrolyte or distilled water, the level of the electrolyte is often The wrong approach of 'Preferring higher than lower'. The electrolyte level is too high. During the driving of the vehicle, the electrolyte can easily overflow from the vent hole and corrode the pole, causing poor contact or early damage to the pole. The electrolyte accumulated on the battery cover connects the positive and negative poles to form a loop, causing the battery to discharge itself. At the same time, if the electrolyte level is too high, the internal pressure of the battery will be too high, and in severe cases, the battery will explode.
7. Freely add distilled water
In the daily maintenance of the battery, when the electrolyte is insufficient, generally distilled water should be added. However, sometimes the decrease in electrolyte is caused by cracks in the battery casing or the leaking of the electrolyte due to the lack of a tight cap on the filling hole. When checking the liquid level, some drivers often do not pay attention to distinguishing whether the electrolyte leakage is caused by the damage of the battery casing or other reasons, or the normal loss. As long as the electrolyte level is lowered, distilled water is added, resulting in a significant decrease in the density of the electrolyte. , So that the battery can not work normally. Some drivers often add distilled water after closing the car. As a result, the added distilled water cannot be fully mixed with the battery’s original electrolyte, which can easily cause the battery to discharge itself or damage the battery plates. In severe cold areas, the battery will also cause partial freezing of the battery. Phenomenon, affecting the service life of the battery. Conversely, if you add distilled water to the battery before leaving the car, since the generator continuously charges the battery while the car is running, the added distilled water can be fully mixed with the original electrolyte in the battery, and the battery performance will not be affected. Therefore, distilled water should be added before leaving the vehicle, and it is not advisable to add distilled water after receiving the vehicle.