Factors affecting UPS battery life-ups battery

At present, the batteries used by UPS are basically maintenance-free lead-acid batteries, and their floating charge design life is generally up to 7 to 15 years. There is a direct relationship.　　　　(1) Depth of discharge and number of discharges 　　　　 Lead batteries repeatedly discharge a large amount of battery power (deep discharge) will shorten battery life. The relationship between life and depth of discharge and number of discharges can be shown in Figure 1. (2) Operating temperature The charging voltage of the battery during floating charge is related to the ambient temperature. When the temperature rises, the charging voltage should be lowered to prevent overcharging; when the ambient temperature is lowered, the charging voltage should be increased to prevent undercharging. , The relationship curve between temperature and charging voltage can be shown in Figure 2. The working temperature has a great influence on the capacity of the battery, and the capacity decreases with the decrease of the ambient temperature. The change in battery capacity when the ambient temperature changes by 1°C is called the temperature coefficient of capacity, and the relationship curve between temperature and capacity can be shown in Figure 3.　　　　(3) Discharge current 　　　　 In order to prolong the service life of the battery, the discharge termination voltage and discharge current of the battery should be strictly controlled to avoid over-discharge. Supplementary charge should be performed immediately after discharge to help prolong the service life of the battery. Table 2 shows the recommended end-of-discharge voltage values u200bu200bat different discharge currents.
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