With the increasing application of outdoor base power stations, UPS battery failures in harsh working environments have gradually occurred, like in South Asia the Pakistan and India, it not only causes economic losses to the telecom operators, but also damages their customer satisfaction. The research organization conducted extensive research on the massive damage of batteries in harsh application environments, deeply understood the application scenarios of UPS batteries, and investigated and analyzed the causes of battery failures.

With the continuous R&D, the performance of GEM UPS batteries is getting better and better, the steady service life time is getting longer and longer, and the reliability of the entire system is getting higher and higher. It is particularly important to do a good job in the maintenance of consumable batteries in UPS.

1. Since the charging mechanism of the current domestic DC system is not very perfect, there is a voltage drift in practice, and the UPS battery is in a floating state for a long time. If the floating voltage deviates from the normal range, it will cause the battery to be overcharged or undercharged. Long-term overcharge or undercharge has a great impact on the performance of the battery.

2. From the current survey of battery usage, thermal runaway is one of the main reasons for battery failure. Thermal runaway means that when the battery is charged at constant voltage, the charging current and battery temperature have a cumulative enhancement effect, which gradually damages the battery. The direct consequence of thermal runaway is the inflation and air leakage of the battery shell, the decrease of battery capacity, and even the deformation of the pole plate in severe cases, and finally failure.

3. The temperature has a great influence on the natural aging process of the battery, and the battery life decreases by 10% for every 5 degrees Celsius of temperature rise, so the UPS should be designed to keep the battery as warm as possible. All online and backup/online hybrid UPS are more This is also an important reason why the battery replacement cycle of the backup or online interactive UPS is relatively long.

4. The operating humidity of the battery should be 5%-95%. If the ambient humidity is too high, condensation will form on the surface of the battery, which is prone to short circuit, and the humidity of the PF environment is too low, which is easy to generate static electricity. Too much dust can also easily short-circuit the lead-acid battery, and the safety valve will be blocked and fail. The crux of the problem is not the battery itself, the problem is that the outdoor battery cabinet does not consider the high temperature protection of the battery. In order to fundamentally solve the problem, we must provide a comprehensive solution for the application of UPS power batteries in harsh outdoor environments.

There are various cooling methods for outdoor cabinets. Which cooling method is suitable for outdoor battery cabinets? This starts with the product characteristics of UPS batteries. For the lead-acid battery in the communication DC power system, the user is most concerned about the service life. The main factors affecting the service life of lead-acid batteries are ambient temperature and grid conditions.

The service life of the UPS battery is closely related to the ambient temperature. The higher the ambient temperature, the shorter the service life of the battery. When the ambient temperature is 25 degrees higher than the required temperature for the design life of the battery, the service life is shortened by half for every 10 degrees of temperature rise.

The number of discharges and the depth of discharge of the UPS battery directly affect the service life of the battery. The more times of discharge and the deeper the depth of discharge, the shorter the service life of the battery. That is to say, frequent power outages from the power grid will reduce the service life of the battery.

For outdoor base stations, operators are usually unable to improve power grid conditions or the cost of improving power grid conditions is too high and unbearable, so start with reducing the working environment temperature of UPS batteries to improve the service life of batteries.

The traditional cooling methods of outdoor cabinets are direct fan ventilation or heat exchangers, but neither of these methods can make the temperature inside the cabinet lower than the ambient temperature outside the cabinet. For the application scenarios of UPS batteries in high temperature areas, active heat dissipation is required to make the temperature inside the outdoor battery cabinet lower than the ambient temperature outside the cabinet. Some manufacturers break through the routine, combine innovation, and introduce refrigeration components into outdoor battery cabinets.

The power changing part of the communication main equipment and the DC power supply will heat up during the operation of the equipment, but the battery is different. According to the electrochemical mechanism of UPS battery charging and discharging, the battery does not heat up when it is discharged. When charging normally (but charging), it basically does not heat up. That is to say, the calorific value of the battery during normal use can be ignored. Therefore, there is no heat source in the outdoor UPS battery cabinet, and the required cooling capacity is small. It is estimated that under normal circumstances, the outdoor battery cabinet only needs a cooling capacity of 200W-400W.

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