In the process of using the uninterruptible power supply system, people tend to think that the battery is protection-free and not paying attention. However, there are materials that appear to be 1/3 of the UPS mains failure or malfunction due to battery failure. It can be seen that strengthening the correct use and protection of the UPS battery has an increasingly important significance for extending the service life of the battery and reducing the failure rate of the UPS power system. In addition to the selection of regular brand batteries, the following aspects should be used to properly protect and protect the battery:
1. Maintain a suitable ambient temperature.
The important factor affecting the battery life is the ambient temperature. The optimum ambient temperature required by battery manufacturers is between 20-25 °C. Although the increase in temperature has improved the discharge capacity of the battery, the price paid is that the life of the battery is greatly shortened. According to the experimental determination, once the ambient temperature exceeds 25 ° C, the battery life will be reduced by half for every 10 ° C increase. At present, the batteries used in UPS power supply are generally sealed-free lead-acid batteries. The design life is generally 5 years, which is achieved under the environment required by the battery manufacturer. If the required environmental requirements are not met, the length of life will vary greatly. In addition, the improvement of the ambient temperature will lead to an increase in the internal chemical activity of the battery, which will generate a large amount of heat energy, which in turn will cause the ambient temperature to rise. This vicious cycle will accelerate the shortening of the battery life.
2. Punctual charge and discharge.
The float voltage and discharge voltage in the UPS power supply are debugged to the rated value at the factory, and the discharge current is added as the load increases. The load should be properly adjusted during operation, such as controlling the electronic equipment such as the microcomputer. The number of units used. Under normal circumstances, the load should not exceed 60% of the rated load of the UPS power supply. Within this range, the discharge current of the battery does not exhibit excessive discharge.
The UPS power supply is connected to the mains power for a long time. In the environment where the power supply quality is high and there is little power outage, the battery will be in a floating state for a long time, and the activity of converting the chemical energy and the electric energy into each other will decrease. , speed up aging and shorten the life of the application. Therefore, it should be completely discharged every 2-3 months, and the discharge timing can be determined according to the capacity of the battery and the load. After the end of one full load discharge, recharge for more than 8 hours as specified.
3. Use communication functions.
At present, most large and medium-sized UPS power supplies have operational functions such as communication with the microcomputer and program control. The corresponding software is installed on the microcomputer, and the UPS power supply is connected through the serial/parallel port, and the program is run, and the microcomputer and the UPS power source can be used for communication. Generally have information inquiry, parameter setting, punctuality setting, automatic shutdown and alarm. After information inquiry, it can obtain information such as mains input voltage, UPS power output voltage, load utilization rate, battery capacity utilization rate, internal temperature and mains frequency; after parameter setting, the basic characteristics of UPS power supply can be set and the battery can be maintained. Time and battery run out of alarms, etc. After these intelligent operations, the operation and management of the UPS power supply and its battery are greatly facilitated.
4. Replace the waste/bad battery in time.
At present, the number of batteries for large and medium-sized UPS power equipment ranges from 3 to 80, and even more. These individual batteries are connected to form a battery pack through the circuit to meet the DC power supply requirements of the UPS. In the operation and operation of the UPS power supply, due to the difference in function and quality, it is inevitable that the function of a single battery will drop and the storage capacity will not meet the requirements. When one or some of the batteries in the battery pack are damaged, the protector should perform an inspection test on each battery to eliminate the damaged battery. When replacing a new battery, you should strive to purchase the same type of battery from the same manufacturer to prevent the acid-proof battery and the sealed battery and the battery of different specifications from being mixed.
After reviewing how to properly use and protect the battery during UPS power supply, this paper introduces four solutions, including: maintaining proper ambient temperature, punctual charging and discharging, using communication functions, and replacing waste/bad batteries in time.