Nickel Metal Hydride No. 5 battery

　　What are the maintenance methods for Nickel Metal Hydride No. 5 battery?

　　The maintenance of Nickel Metal Hydride No. 5 battery requires maintaining a suitable ambient temperature, regular charging and discharging, and timely replacement of waste/bad batteries. Factors that affect the service life of the battery include ambient temperature, discharge depth, battery storage and transportation, etc. The following is a detailed introduction to the "UPS battery" Maintenance methods and factors affecting battery life.”

　　1. Maintenance method of UPS battery

　　1. Maintain a suitable ambient temperature

　　In order to effectively charge the UPS battery, the ambient temperature range should be between 5-30 degrees. Generally, the charging efficiency will increase with the increase of temperature. However, when the temperature rises above 45 degrees, the performance of the rechargeable battery materials will degrade at high temperatures. , the battery cycle life will also be greatly shortened.

　　2. Regular charging and discharging

　　The float voltage and discharge voltage in the UPS power battery have been adjusted to the rated value when leaving the factory, and the discharge current increases with the increase of the load. The load should be reasonably adjusted during use, such as controlling electronics such as microcomputers. The number of devices used. Under normal circumstances, the load should not exceed 60% of the UPS rated load. Within this range, the discharge current of the UPS battery will not be over-discharged.

　　3. Replace waste/bad batteries promptly

　　In the continuous operation and use of Nickel Metal Hydride No. 5 battery, due to differences in performance and quality, it is inevitable that the performance of individual batteries will decline, the storage capacity will not meet the requirements, and damage will be inevitable. When certain batteries/batteries in the battery pack are damaged, maintenance personnel should inspect and test each battery to eliminate damaged batteries. When replacing a new UPS power battery, you should strive to purchase batteries of the same manufacturer and model. It is prohibited to mix acid-proof batteries, sealed batteries, and batteries of different specifications.

　　2. Main factors affecting UPS battery life

　　1. Ambient temperature has a greater impact on the battery:

　　If the ambient temperature is too high, the battery will be overcharged to produce gas. If the ambient temperature is too low, the battery will be undercharged, which will affect the service life of the battery. Therefore, the ambient temperature is generally required to be around 25°C, and the UPS float voltage value is also set according to this temperature. In practical applications, batteries are generally charged within the range of 5°C to 35°C. If the temperature is lower than 5°C or higher than 35°C, the capacity of the battery will be greatly reduced and the service life of the battery will be shortened.

　　2. Discharge depth also has a great impact on battery life:

　　The deeper the battery is discharged, the fewer cycles it will be used, so deep discharge should be avoided during use. Although the UPS has a battery low-voltage protection function, generally when a single battery is discharged to about 10.5V, the UPS will automatically shut down. However, if the UPS is discharged under light load or no load, it will also cause deep discharge of the battery. The so-called depth of discharge refers to the percentage of the capacity that the user allows the battery to discharge when using the battery as a percentage of its standard capacity.

　　3. During storage, transportation, and installation, the battery will lose part of its capacity due to self-discharge:

　　Before being put into use after installation, the remaining capacity of the battery should be judged based on the open circuit voltage of the battery, and then different methods should be used to recharge the battery. For spare storage batteries, supplementary charging should be carried out every 3 months. The quality of the battery can be judged by measuring the battery open circuit voltage. Taking a 12V battery as an example, if the open circuit voltage is higher than 12.5V, it means that the battery has more than 80% energy storage. If the open circuit voltage is lower than 12.5V, it should be recharged immediately. If the open circuit voltage is lower than 12V, it means that the battery stores less than 20% of the electric energy and the battery cannot be used.

　　4. Battery charge and discharge current is generally represented by C. The actual value of C is related to the battery capacity:

　　For example, for a 100AH battery, C=100A. The optimal charging current for lead-acid maintenance-free batteries is about 0.1C, and the charging current cannot be greater than 0.3C. Charging current that is too large or too small will affect the service life of the battery. The discharge current is generally required to be between 0.05C and 3C. The UPS can meet this requirement in normal use, but it must also prevent unexpected situations, such as battery short circuit, etc.

　　5. Charging voltage:

　　Since the UPS battery is a backup working mode, the mains power is in a charging state under normal circumstances and will only be discharged when there is a power outage. In order to extend the service life of the battery, the UPS charger is generally controlled by a constant voltage and current limiting method. After the battery is fully charged, it switches to a float charge state, and the float charge voltage of each cell is set to about 13.6V. If the charging voltage is too high, the battery will be overcharged, and conversely, the battery will be undercharged.

　　6. Because the maintenance-free battery adopts an absorption electrolyte system, it will not produce any gas during normal use. However, if the user uses it improperly and causes the battery to be overcharged, gas will be produced. At this time, the internal pressure of the battery will increase and the battery will be damaged. If the pressure valve on the battery is opened, the battery may burst.

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