The battery is an important part of the uninterruptible power supply. The battery maintenance is not aging and the individual backward battery often causes the whole battery capacity and design capacity to be seriously insufficient. In the maintenance work, the replacement of the single battery or the "sickness" work is often used. When the deterioration is serious, the battery of the same capacity, same model, and same batch can be replaced according to the regulations. When the above requirements are not met, the whole group of replacements is often used, resulting in an increase in maintenance costs, which is 2.30/AH according to the current market price. A replacement of a 2000AH battery pack will cost 110,400 yuan (a group of 48 1000AH batteries).
First, analyze the main reason for battery backwardness
According to the regulations, the battery pack capacity is less than 80%, and the whole group will be replaced. Most of the batteries are backward:
1. The gas recombination efficiency has a great relationship with the selection of the float voltage. The voltage selection is too low. Although the oxygen is precipitated less and the compounding efficiency is high, the individual batteries may fail due to insufficient long-term charging, causing the battery to be shortened. The float charge selection is too high, the gas precipitation is increased, and the gas recombination efficiency is low. Although the anode failure is avoided, the safety valve is frequently opened, the water loss is large, and the positive grid is also corroded. Affects battery life.
2. The relevant properties of various battery housing materials are shown in the table below. From the data in the table, the water vapor permeability of the ABS material is large, but the strength is good. The permeability of the battery case, besides the type and nature of the material of the casing, is also related to the wall thickness and the difference in water vapor pressure between the inside and outside of the casing.
3, grid corrosion will also cause water consumption, the reaction is: Pb + 2H2OPbO2 + 4H + + 4e - grid corrosion consumption water;
4, self-discharge loss of water, the positive electrode self-discharge of oxygen can be recombined in the negative electrode without loss of water, but the hydrogen deposited by the negative electrode can not be compounded in the positive electrode, will accumulate in the battery, discharged from the safety valve and lose water, especially the battery Self-discharge is accelerated when stored at higher temperatures.
5. According to the existing maintenance methods, it is often found that the backward battery is recharged and discharged in a way that remedies the effect that the performance is good, the overcharge is poor, the performance is poor, and the single cell is backward with the maintenance time. The normal supply of equipment is becoming more and more critical.
In view of the above situation, in order to save maintenance costs, the battery can be first detected by the battery online monitoring device, and then the battery activation device is added with distilled water to charge and discharge to activate the backward battery. The facts show that the backward battery capacity can be greatly increased to meet the maintenance regulations, and the battery pack can continue to be used.
Second, the experience of battery activation
1. To regenerate the backward battery, add enough distilled water to fully dilute the internal plates of the battery.
2. It is not advisable to leave the activated battery idle for a long time after activation of charge and discharge.
The battery activation instrument and the capacity tester can provide accurate test data and maintenance means for maintenance work, effectively reduce maintenance costs and daily maintenance workload, and improve the safety factor of equipment power supply.
Third, the precautions in the repair process
1. Precautions during the repair process. Monitor the voltage at the end of each battery with a multimeter at any time. The battery is heated. If there is an individual hole overflowing the electrolyte, use a syringe to remove it at any time to prevent short circuit of the battery. Hole, do not add electrolyte and use distilled water to replenish in time. Because the heat of individual holes is serious, it may be caused by short circuit of battery, large internal resistance or high specific gravity of the electrolyte. Here, the high specific gravity of the electrolyte is given priority. Therefore, it is best to have distilled water for use before repair. Then, the battery with heat is manually selected for current repair below 3A. It can also be water-cooled (prepare a plastic basin to put cold water, put the hot battery, pay attention to the water surface at the battery 2|3 height, pay attention to the water can not enter the battery hole Inside, the temperature rise phenomenon can be reduced because the automatic repair function easily causes heat generation and electrolyte overflow at the beginning.
2. During the repair process, if there is any of the following phenomena, the battery can no longer be used:
(1) Always check the temperature of the battery case (can be touched by hand), if there is a local temperature higher than other parts, or a certain electrolyte boiling, the gas is serious (even in the daytime, the heat is serious) The hole flashlight can see the white gas coming out, this method is very smart) that there is a short circuit in the inner plate of the grid.
(2) If the battery is not charged for a long time (the voltage does not rise), the continuous charging time after desulfurization is more than 6 hours, the charging is not completed, or a certain local heat of the battery is serious. This may be a short circuit inside the battery, or a pole. The board is peeled off. It is necessary to check the voltage and the charge, and the battery whose voltage is too low or the charge is too low (no power) cannot be used.
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