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How to maintain UPS battery correctly

Time of publication: 10:30, September 12, 2020

There are technical differences between ups and EPS in battery charging management. EPS power supply and UPS power supply As a reserve power supply, it is more and more widely used in social development. Without battery, EPS power supply will cause hemiplegia White background.jpg

According to the statistical analysis of UPS power supply maintenance work, we can get the following results: for backup UPS power supply, the common faults caused by batteries are more than 50% of the total common faults; for online UPS, the common faults caused by batteries are more than 50% of the total common faults, Because its circuit principle is effective, especially with the development trend of scientific and technological progress, most of them choose the integrated, modular design, intelligent system of UPS power supply, and the reserve capacity is relatively large, so the common faults caused by power supply are very few, by comparison, the common faults caused by lithium battery pack rise to above 60%. Therefore, proper application and maintenance of the battery is the first condition to increase the service life of the battery group and reduce the failure rate of UPS power supply equipment.

"Simply said, the battery has three major characteristics: large scale of operation, high project cost, low value and easy consumption. All you can do is try your best to increase the battery life, which actually improves the usability of big data centers. Here is a detailed introduction to the four countermeasures taken by machine equipment supervisors of big data center to extend the service life of UPS battery in big data center.

Purchase UPS battery with moderate operation scale for big data center

In most big data centers, UPS can fill the battery in 20 minutes. This is called long-term load battery charging. Compared with low load battery charging, long-term load battery charging has thinner and larger number of solar panels. However, the service life of long-term load battery is usually shorter.

There will continue to be many other factors that must be taken into account when purchasing UPS batteries, such as life expectancy, operating voltage standards, front-end development operations, additional costs, and other considerations. In addition, executives of big data centers should also fully consider other potential problems, such as the sealing of rechargeable batteries and internal connection.

Install, operate and maintain batteries properly

Incorrect installation and maintenance will reduce the battery life. In other words, a good maintenance strategy is to show the battery a good natural ventilation standard. The temperature should be controlled at 77 degrees Fahrenheit as much as possible. In addition, it should be ensured that the gas temperature of the batteries in all lithium batteries will be 3 degrees Fahrenheit. In addition, it should also be ensured that the embrittlement rate of some batteries in the lithium battery pack is not too fast than that of other rechargeable batteries.

Why is that? The battery with different service time and internal resistance size will accelerate the whole process of embrittlement. Regular maintenance of batteries can deal with various problems, such as loose connection and poor sealing of liquid filled rechargeable batteries, which can cause erosion of machinery and equipment, and even cause fire accidents.

In addition, big data center managers should also pay attention to battery charging and discharging at any time and anywhere. If an empty rechargeable battery is not recharged by the battery within two days, most of the rechargeable battery will be damaged. Excessive charge and discharge of the battery will cause the problem of repeated battery charging, and excessive charging and discharging will also reduce the service life of the battery.

Test UPS battery capacity

The internal resistance of the battery will gradually expand due to the corrosion and other factors. When the increase rate reaches 30%, it is time to replace the battery. According to the volume test, this problem is very easy to detect. As most manufacturers say, when the capacity of a battery is reduced to 80% of its initial capacity, it should be replaced. When testing the characteristics and volume of the battery, the customer shall comply with the IEEE specification, * * ieee1180 or ieee450.

Battery charging on time

UPS is in floating charge for a long time without the whole process of charging and discharging, which is equivalent to "storage standby". If this kind of situation continues for too long, it will lead to the storage battery for too long and invalid damage. This is manifested in the expansion of the internal resistance of the battery, and the internal resistance reaches several ohms when it is more serious. At indoor temperature, the storage capacity of the battery after one month storage is about 97% of its rated current. If it is not needed for 6 months, its applied capacity will become 80% of the short-circuit capacity. If the volume of storage can be further reduced, the temperature can be further reduced. Therefore, it is suggested that the customer * * should input the final breaking voltage intentionally every month, so that the kinetic energy of UPS can be shown by the battery to the inverter power supply. However, this kind of practical operation is not suitable for too long time. It can be charged and discharged for 10 minutes at 30% of the rated load output.

Reduce deep charge and discharge

The service life of the battery is closely related to the depth of its charge and discharge. The lighter the load required by UPS, the greater the short-circuit capacity ratio between the storage capacity of the battery and the final interruption of the voltage supply system. When UPS switches on and off automatically due to low battery voltage, the battery will be charged and discharged deeply. The method to reduce the deep charge and discharge of battery in specific application is: when the voltage power supply system is finally cut off and the battery supplies power to the inverter power supply system, when the UPS power supply alarm indicates that the battery is in the deep charging and discharging situation, emergency treatment should be carried out immediately and the ups should be turned off. In general, the UPS has to work automatically because the battery voltage is not too low.

Battery charging when using Valley

For UPS customers who are in low voltage power supply system for a long time or power failure frequently, in order to avoid battery damage too early due to long-term insufficient battery charging, it is necessary to flexibly use the power consumption valley time (such as in the middle of the night) to charge the battery, so as to ensure that the battery has sufficient battery charging time after each charge and discharge. Generally, 90% of the short-circuit capacity of the recharged battery must be at least 10-12h after the battery is deeply charged and discharged. Try to keep the battery fully charged.

Pay attention to the selection of charging head

Maintenance free sealed lead-acid batteries for UPS can not be charged by thyristor type fast charger. This is because this kind of charging head will cause the battery to be in the extreme battery charging condition of both instantaneous over-current battery charging and instantaneous overvoltage battery charging. This kind of situation will greatly reduce the storage capacity of the battery, and in serious cases, the battery will be damaged. When choosing ups with constant current source up to battery charging control circuit, it is not necessary to adjust the battery voltage too low in maintenance work, otherwise it is very easy to cause over-current battery charging in the early stage of battery charging. **It uses the charging head with both constant current power supply and constant current source to charge the battery.

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