First, the role of the battery pack in the communication system
At present, most of the batteries used in communication power are advanced valve-regulated sealed lead-acid batteries. The voltage of each cell of this battery is generally 2V, which forms a 48V or 24V system in series. It protects communication equipment and facilities Two functions to ensure the smooth operation of the network. In ensuring communication power equipment facilities, the battery, together with the UPS and switching power supply system, plays a role in preventing voltage surges, waves, spikes (drops), transients, and undervoltages (overvoltages) in the utility grid, which effectively protects communication equipment, Prevent downtime accidents. In ensuring the smooth operation of the network, the battery, UPS, and switching power supply system work together to maintain the normal operation of the system when the mains power is interrupted, while also filtering out noise voltages and maintaining communication quality.
Once these batteries are installed and put into operation in a communication base station, they will not be replaced within a few years. Therefore, it is of great significance to strengthen the maintenance of the battery and improve its use, thereby effectively extending the service life of the battery. The battery online detection is currently unattended and plays an indispensable role in the maintenance of communication power.
Second, the technical status of the communication system battery
The base station to achieve battery current is not an important part of the uninterruptible power supply, and its investment switching power supply device is roughly equal. At present, most mobile base stations use valve-regulated sealed lead-acid batteries ( VRLA batteries) developed at the end of the twentieth century. Due to the use of a valve-controlled sealing structure, no acid or water maintenance is required, no acid liquid or acid mist leaks out, and it can be installed in the same equipment room as the equipment. Because of its small size, lightweight, small self-discharge, less maintenance, long life, easy to use, safe and reliable, it is welcomed by users. However, we must see that on the one hand, the basic electrochemical principle of this battery has not changed, so its inherent electrical characteristics requirements have not only remained unchanged but have become more stringent; on the other hand, in the early stage of this battery's promotion, manufacturers' instructions Sometimes this battery is more or less called a "maintenance-free" battery, causing some maintenance personnel to think that this battery does not require maintenance, which makes battery maintenance and testing not given due attention. This misleading has so far Have a profound impact.
The main reasons that cause the battery capacity of base stations to fall too quickly and shorten the service life are:
First, the base station has frequent power outages, long power outages, and irregular power outage times, which frequently causes the battery to charge and discharge. According to the current battery manufacturer's anatomy of the battery at the base station, the end of battery life is caused by the sulfate of the battery negative plate This is a typical phenomenon of early battery capacity failure ( PCL).
The reason for causing the sulfate of the negative plate of the battery is as follows: the frequency of power outages in the base station is too high, and there are several times of power outages in a day, or even several days of continuous power outages so that the battery of the base station is discharged without being fully charged after discharge, and the battery is undercharged. If multiple undercharges occur consecutively, which will cause a cumulative loss of battery capacity, the battery capacity of the base station will decrease in a short period, and its service life will be terminated quickly. Generally speaking, the speed at which the battery capacity decreases is proportional to the number of consecutive undercharges of the base station battery. The internal cause of the decrease in battery capacity is that when the battery is discharged after it is not fully charged, the lead sulfate produced by the positive and negative electrodes after discharge can not be fully restored to lead dioxide and metal lead, respectively. The negative plate is discharged again, causing the battery to be undercharged. The battery is undercharged several times in a row, which gradually sulfates the negative plate and produces irreversible crystalline lead sulfate, especially when the battery is under over-discharge. The change will be more serious, and the speed of sulfation will be faster, which will cause the surface of the negative plate to be shielded, and its function will gradually decrease until it fails, which will lead to the decline of the battery life until the termination.
Second, the setting parameters of the switching power supply are unreasonable. The base station battery undervoltage protection setting voltage is too low and the reset voltage is set too low, which causes the battery to over-discharge or even deep over-discharge, which exacerbates the sulfation of the battery negative plate.
Third, the use environment of base stations is poor. After the base station is powered off, the ambient temperature of the base station gradually rises because there is no air conditioning. Or due to air conditioning failure, the indoor temperature of the base station is high, thereby reducing battery life.
The indoor base stations are all equipped with air conditioners. The air conditioners configured are general cabinets or split air conditioners. Long-term uninterrupted use will cause some base stations to fail and shut down the air conditioners. Sometimes the air conditioners are not repaired in time when they are damaged. After the shutdown, the indoor temperature of the base station rises sharply, and the indoor temperature of the color steel equipment room can even reach above 70 ° C.
Fourth, after the base station is powered off, the battery is discharged to the termination voltage and failure to replenish power promptly will also lead to a decrease in battery capacity and a shortened service life.
Despite these problems with the batteries used in communication stations, the maintenance systems and equipment of our main telecommunications operators cannot guarantee timely detection of battery problems, timely maintenance of them, and timely replacement of backward batteries. , To avoid the occurrence of drop-off accidents. The battery on-line monitoring system came into being under such circumstances.
Third, the battery monitor must be of
From the above analysis, communication power is the foundation of the communication network, and the backup battery is the last barrier of the entire communication power. Once the accident caused by the battery, especially the battery in the communication room, will cause huge losses! Therefore, to ensure the smooth operation of the communication network, various communication operators have intensified the maintenance and testing of the battery in the communication room, while introducing strict maintenance regulations of IEEE1189-2005. The current maintenance regulations mainly rely on regular, mandatory check discharges to monitor the health and charging status of batteries. However, due to the limitation of the establishment of maintenance technicians, the remote and scattered maintenance sites, and the long time required for inspection operations, the completion rate of battery maintenance in the entire communications industry is very low. At present, the only feasible maintenance technique without testing dead zones is the use of battery monitoring systems. Battery monitoring has the following advantages over traditional regular monitoring;
Reduce the manual time required to manually measure and check the battery on site.
The data provided by the monitoring system can be used to understand the health status of the battery in a planned way without the need to check on-site according to the calendar, thereby saving costs.
Continuous online battery system monitoring improves the reliability of power supply and reduces system downtime.
Replace the impending battery before it affects other batteries in the same group to avoid mutual influence, thereby extending the overall battery system life.
Know which batteries have reached the replacement time, so that you have more initiative in battery procurement while reducing the occurrence of batch replacement batteries.
Increase customer satisfaction and uptime by reducing the chance of power outages.
Avoid loss of annual income due to power outages.
The ability of the monitoring system to identify batteries with signs of damage increases system reliability, which in turn increases production capacity.
With our patented impedance measurement technology, reliable trend data will accurately show battery problems when the battery begins to fail.
Do not rely on measuring the voltage to determine the battery status, the voltage measurement cannot accurately show the quality and availability of the battery.
The battery monitoring management system has the functions of remote monitoring, data collection, and trend analysis. It can remotely monitor multiple battery systems, which improves management efficiency.
It can be foreseen when and where the power company will lose power because the battery system cannot provide a DC power supply.
Accurately track and record battery real-time performance during power outages.
Accurately monitor all items that have a direct impact on battery performance:
Although the installation of the battery and a one-time online system will increase the operation and maintenance costs expenses, but the charge to improve the battery life has 30%, reduce maintenance workload 75%, 80% reduction in maintenance costs, reduce out station accident occurred, improve customer communication Looking at the return of satisfaction, it is worth it.