These batteries installed in the communications base stations in operation, does not involve the replacement within a few years, thus strengthening the maintenance of the batteries, to improve their situation, thus effectively extend battery life, is of great significance. Battery online testing unattended play in the maintenance of the communication power should not be ignored missing
Second, the communication system battery state of technology
The battery pack is an important part of the base station DC uninterruptible power supply, is roughly equal to the amount of investment and switching power supply equipment. VRLA batteries are used by mobile base stations developed in the late twentieth century (referred to as VRLA batteries). VRLA structure do not need to add acid, add water, maintenance, no acid mist leaking out of the engine room installation and equipment. Due to small size, light weight and small self-discharge, low maintenance, long life, easy to use, safe and reliable features, welcomed by users. But we must see, on the one hand, this battery of basic electrochemical principle remains the same, and thus its inherent requirements of the electrical characteristics of not only not changed, but requires more stringent; the other hand, the battery early in the promotion, the manufacturer instructions sometimes more or less the battery called the "maintenance free" batteries, resulting in part of the maintenance personnel that the battery does not need to maintain, making the battery maintenance and testing not given due attention yet, this misleading have a profound effect.
The base station battery from the situation currently in use, the prevalence of battery capacity decreased too fast, short life, out station accidents occur frequently. In terms of the quality of the several large domestic valve-regulated sealed battery manufacturers battery should be able to meet operator requirements, the manufacturers producing battery quality, performance differences. The quality factor of the battery should not affect the battery capacity of each operator base station fell too fast, shorten the life of the main reasons. From the valve-regulated sealed battery product mix, product performance, the base station battery using the process of site investigation, and a combination of factors such as view, combined with the use of exchange stations, VRLA battery after 1-4 years under normal circumstances, the capacity decline should not be so fast, causing the base station battery capacity fell too fast, shorten the life of the main reason for its base station using the environment as well as maintenance-related.
Causing the base station battery capacity fell too fast, shorten the life of the main reasons are:
First, base stations, frequent power outages, power outages for a long time, the outage time without the law, so that the battery charge and discharge frequently, according to the battery manufacturer base station waste batteries and anatomical point of view, leading to the battery end of life because the battery negative plate sulfation This is a typical phenomenon of the battery early capacity failure (PCL).
Discharge cause the battery negative plates of sulfation of the reasons are as follows: the base station blackout frequency times too high, and power outages several times a day, or even a continuous power outage a few days, so that the base station battery discharge has not been fully charged, the battery charge less phenomenon . Continuously on many occasions to charge less, battery capacity will result in a cumulative loss, the battery capacity of the base station in a relatively short drop, faster termination of their service life. In general, the rate of decline of battery capacity and the base station battery charge less the number of consecutive a positive relationship. The intrinsic reason is that the battery capacity decline, in the case of not fully charged, discharge the battery discharge, the positive and negative lead sulfate generated after the discharge can not revert to lead dioxide and metallic lead is negative plate discharge, the batteries produce less filling, repeatedly charge less negative plates gradually sulfate, resulting in irreversible crystallization of lead sulfate, especially batteries in depth over the discharge, the battery negative plates sulfate of more serious, sulfate would be faster, causing the surface of the negative plate shield, its function gradually decreased until failure, leading to decline until the termination of battery life.
Second, the switching power supply to set the parameters of the unreasonable, the base station battery undervoltage protection is set too low, the voltage and reset voltage is set too low, the battery overdischarge even the depth of the discharge phenomenon, on the other hand exacerbated the negative battery plate sulfation.
At present, the base station combination of switching power supply are set to a low voltage isolation protection or secondary under the power function. When the battery discharge to a set voltage, switching power supply system will automatically cut off the supply of heavy load the power supply on the part of or all of the load, to protect the battery discharge, however, ensure that the battery life.
Such as the minimum battery undervoltage protection value is set too low, the battery will discharge many times over discharge and over-discharge failure to supplement the insufficient electricity or charge will seriously affect the battery life; such as switching power supply reset voltage is set too low, the battery will discharge repeated several times during the discharge process; the lowest specific battery under-voltage protection value set should be set depending on the size of the load current, and the current minimum base station battery undervoltage protection value is generally set in each of the single cell voltage 1.8 V, and some even set up for each 1.75V. According to the actual load current of the discharge of the VRLA battery performance combined with the base station (currently most of the base stations, the actual load current is less than 0.1C10A), the lowest base station battery under-voltage protection value should be set above each of the battery voltage 1.8V.
Therefore, the current base station battery undervoltage protection setting the reference voltage is too low, such as base stations, an extended power outage, the battery will over-discharge, and even the depth of the small current over-discharge, over-discharge of the battery is fully charged, required to restore the capacity charge a longer time, the depth over the discharge of the battery in the base stations existing constant voltage charging conditions, the general is difficult to fully recover its rated capacity. Switching power supply parameters set unreasonable the other hand, intensified the battery negative plate sulfation, resulting in the decline in battery capacity, shorten the life.
Third, the base station to poor use of the environment. Base station power outage, no air conditioning, so the base station ambient temperature gradually increased. Or due to air conditioning failure, the base station indoor temperature is high, thus reducing battery life.
The indoor base stations are equipped with air conditioning, the configuration of air conditioning for the general Guiji or split air conditioning, long uninterrupted part of the base station air conditioning failure, shut down, air conditioning damaged and sometimes lack of timely maintenance, and indoor base station is a closed room, air conditioning increased substantially after the shutdown, the base station indoor temperature, color plate room of the indoor temperature can even reach more than 70 ℃.
Hand, even if the air conditioning to normal, while the base station due to power outages, no AC power, air conditioning is not cooling, especially in the summer, will enable the base station indoor temperature increased sharply, thus affecting the normal working of the battery. This allows the valve-regulated sealed inside the battery water loss and increase electrolyte saturation decreased (glass fiber cotton diaphragm electrolyte decrease) in reduced battery capacity and shorten the battery life.
On the other hand, the indoor temperature is too high, will allow the battery thermal runaway effect intensified, resulting in increased corrosion rate of the battery positive plate, the plate deformation expansion, battery shell bulging or cracking, and finally lead to a rapid decline in battery capacity, shorter battery life. Accelerated life tests showed that the ambient temperature of 10 degrees, and does not adjust the charge voltage, the battery life will be shortened by half.
Fourth, the base station power outage, the battery discharge termination voltage is not timely supplement call, will also lead to the decline in battery capacity and shorten the life.
Part of the base station is located in the suburbs or remote villages and other places, the mains supply situation worse, the power cut more often and longer outage time, often once the mains failure, battery discharge termination voltage, electricity has not yet recovered. one hand, this may cause the battery to over discharge the other hand, the battery discharge and then can not get the timely replenishment of power, according to the relevant data indicate that the battery discharge if not timely supplementary charge will enable the battery capacity gradually decreased after several cycles, The battery life will be shortened significantly.
Other base stations, switching power supply output float voltage value is smaller than the set value and display value 1V, causing the battery to long to charge less.
Despite these problems of the communication station batteries, but the maintenance of major telecommunications operators in our current system and the nursing staff equipped can not guarantee timely detection of battery problems, and its maintenance in a timely manner, in a timely manner will be behind the battery replaced to avoid the out station accident. Battery on-line monitoring system is in such an environment came into being.
Three, the need for battery monitoring
From the above analysis, communications, power communication network, spare battery and the entire communications the last bulwark of the power supply, battery, especially the communications room of the battery caused the accident occurred, it will cause huge losses! Therefore, all communication operators to ensure the smooth operation of communication networks, have strengthened the communications room battery maintenance and testing, while the introduction of the IEEE1189-2005 strict maintenance procedures. The current maintenance procedures depends mainly on the regular, mandatory check-discharge to monitor the health status of the battery and charging status. However, due to the maintenance of technical staffing constraints, to maintain a remote location, dispersion, detection takes a long time factors, the low completion rate of the communications industry as a whole battery maintenance. Now the only viable, there is no test blind maintenance technical means is a battery monitoring system. The battery monitoring have the advantage compared to the traditional regular monitoring;
Reduce to a field manual measurements and check the battery required for the artificial time.
? data provided by monitoring systems plan to understand the battery state of health, without subject to the calendar to the site inspection, thereby saving costs.
Line continuous battery system monitoring, improve the reliability of electricity supply, can reduce system downtime.
? the battery before expiring battery affect the same group will be replaced to avoid the interaction, thus extending the overall battery system life.
Grasp what battery to replace the time, which has a bigger battery procurement initiative, while reducing the bulk to replace the battery situation.
? increased risk of customer satisfaction and uptime by reducing the power supply to power outages.
? Avoid the annual revenue loss caused by power outages.
? monitoring system to identify signs of damage, the battery's ability to enhance the reliability of the system, thus increasing production capacity.
? use of our patented impedance measurement techniques, and the beginning of the battery there is a failure, reliable trend data will display correctly to the battery problem.
? does not depend on rely on measuring voltage to determine the status of the battery voltage measurement value is not precisely show the battery is good or bad, and availability.
? Battery monitoring and management system with remote monitoring, data collection and trend analysis can be multiple sets of batteries of the remote monitoring system to improve management efficiency.
? You can predict when and where power outages caused by power companies, the battery system is unable to provide the DC power supply.
Accurate track record of real-time performance of the battery during a power outage.
? Accurate monitoring of all projects that have a direct impact on battery performance:
Install batteries on-line system will be a one-time increase the expenses of operation and maintenance costs, the charge but the battery life of 30%, reduce maintenance workload of 75%, 80% lower maintenance costs, to reduce the incidence of out station accident, improve communications customers the return of the satisfaction of view is totally worth it.
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