Judging from the quality of UPS batteries produced by several large valve-controlled sealed battery manufacturers in my country, it can basically meet the requirements of various operators, but there are certain differences in the quality and performance of the batteries produced by various manufacturers . From the perspective of investigation and use, due to the high cost and low bid price, the quality of Leoch batteries produced by some manufacturers has certain problems, but the quality of the batteries is not problematic in use. The battery capacity of some base stations has dropped too fast and the service life is greatly shortened. According to the comprehensive factors such as the product structure, product performance, and on-site inspections during the use of the base station battery, combined with the use of the exchange station, the capacity of the valve-controlled sealed battery will not drop so fast after 1-4 years of normal use. The main reason for the sharp decline in battery capacity and the shortened service life of the base station is that the characteristics of the base station itself are related to the use environment of the base station. According to the survey, there are several main reasons that affect the battery capacity and service life of the base station when there is no problem with the quality of the UPS battery.
First of all, frequent power outages, long power outages, and irregular power outages in the base station make the ups battery charge and discharge frequently, which causes the battery capacity to drop too fast and use One of the main reasons for shortened life. According to the anatomy of the discarded batteries of the base station, the reason for the end of the battery life is the sulfation of the battery negative electrode, which is a typical PCL phenomenon.
There are two possible reasons for the sulfation of the negative plate of the battery:
1. The frequency of power outages of the base station is too high, one day Several times, or even several days of power outages, caused the base station's battery to be discharged again after being discharged, and the power was insufficient. If the undercharge occurs several times in a row, it will cause a cumulative loss of battery capacity. Then the battery capacity of the base station will decrease in a short time, and its service life will soon end. The rate of battery capacity decline is directly proportional to the number of undercharged batteries. The inherent reason for the decrease in battery capacity is that the battery is discharged again under the condition of insufficient charge, and the positive and negative plates are discharged again under the condition that the natural lead sulfate cannot be completely reduced to lead dioxide and metallic lead after discharge, causing the battery to be under-charged. When the battery is charged or undercharged continuously, the negative plate is gradually sulfated and produces irreversible crystalline lead sulfate. Especially when the battery is deeply over-discharged, the sulfation of the negative plate of the battery will be more serious, and the sulfation rate will be faster, resulting in the surface of the negative plate. The function of the shielding will gradually decline until it fails, resulting in a decline in battery life until the end. Through the analysis of the actual use of existing base station batteries, it is believed that there is a possibility of insufficient battery charging. In addition, although the battery has multiple undercharges, secondary undercharges or multiple undercharges do not often occur continuously. The probability and probability of accumulative battery undercharge need to be further determined.
Second, another view is that the main reason for the battery capacity and service life of the base station is the sulfation of the battery negative plate. Insufficient power accumulated in the battery will cause sulfation of the negative plate. The increase in the number of battery charge and discharge cycles or the excessive number of charge and discharge cycles within a certain period of time will also cause the sulfation of the negative plate or the sulfation of the negative plate, which is an important factor in the conversion process. Of course, in addition to the above-mentioned reasons, there are many reasons for the sulfation of the negative plate of the battery. For example, the impurity of electrolyte or glass fiber cotton exceeds the standard, which speeds up the self-discharge of the battery. The floating charge or balance voltage is too low to make some lead sulfate crystals insoluble. The charging efficiency of the Ricci battery is reduced due to overdischarge or deep discharge at a small current in the initial stage. The operating temperature of the battery is too high, the impurity ions are more active, and the self-discharge of the battery is accelerated. According to the current battery manufacturer's scale, production technology and technical level, the main reason for the sulfation of the negative plate of the base station battery is not the product quality, because under the condition of normal use of the battery, the sulfation of the negative plate of the battery takes a long time and it is difficult to recover The capacity of the battery. In addition, from the analysis of usage, different manufacturers, whether imported batteries or domestic batteries, have this problem.
Therefore, the main reason for the sulfation of the negative plate of the base station battery is the frequent power outages, frequent overdischarges, and deep overdischarges of small currents in the base station. Insufficient charging occurred once, resulting in insufficient charging of the battery, too frequent charging and discharging cycles of the base station, resulting in irreversible sulfation of the negative plate. The sulfation of the negative plate is the main reason that affects the battery capacity and service life of the base station. Secondly, the setting parameters of the switching power supply are unfair. The base station battery undervoltage protection setting voltage is too low, and the reset voltage setting is too low, causing the battery to be over-discharged or even deeply over-discharged. On the other hand, it aggravates the sulfation of the negative plate of the battery, which is another main reason for the decrease in battery capacity and shortened service life.
At present, the base station combined switching power supply has a low-voltage isolation protection function or a secondary power-down function. When the battery is discharged to a certain set voltage value, the switching power supply system will automatically cut off the power of part of the heavy load or the whole load to protect the battery from being discharged and ensure the service life of the battery. If the minimum under-voltage protection value of the battery is set too low, the battery will be over-discharged. If the battery is over-discharged many times and is not replenished or charged in time after over-discharge, it will seriously affect the service life of the battery; in addition, if the reset voltage of the switch is set If it is too low, the UPS battery will be repeatedly discharged during the discharging process; the minimum under-voltage protection value of the specific battery should be set according to the load current.
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