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A: UPS battery commonly used types of factors that affect battery life, different kinds of advantages and disadvantages of the battery:
Applications in UPS battery There are three types: liquid lead-acid batteries, including an open, maintenance-free battery, nickel cadmium batteries. The factory is equipped with UPS battery is generally maintenance-free batteries, following the main battery so as not to introduce three types of battery maintenance features:
1: open the liquid lead-acid batteries: These batteries can be divided according to structure 8-10 years ,15-20 two-year life span. Because the sulfuric acid battery electrolyte will produce corrosive gases, such batteries must be installed in the ventilation and the room away from the sophisticated electronic equipment, and battery room should be corrosion resistant ceramic tile laying.
As the evaporation of the reason, open the battery to be periodically measuring the proportion of the acidic water. The battery temperature tolerable pressure and deep discharge. Smoking and use the battery room should open the battery holder.
After charging the battery can not transport, and therefore must charge at the scene after the installation normally takes 55-90 hours of initial charging. Each section of the normal voltage of 2V, initial charging voltage of 2.6-2.7v.
2: maintenance-free battery: also known as VRLA batteries, the use and maintenance should follow the following principles:
a: Sealed batteries can run allowable range of 15 degrees -50 degrees, 5 degrees -35 degrees, but the use of extended battery life. Minus 15 degrees in the following chemical composition will change the battery not charging. 20 degrees to 25 degrees in the range of use to a maximum of life. Batteries will be run in the low-temperature long-lived but low capacity, high operating capacity will be higher, but short-lived.
b: the relationship between battery life and temperature can refer to the following rules, after the temperature exceeds 25 degrees Celsius, 8.3 degrees every high battery life will be reduced by half.
c: the design of maintenance-free battery float voltage to 2.3V / section. 12V battery is 13.8V. CSB has proposed that each section of 2.25-2.3V. Battery series in 120 cases, the temperature higher than 25 degrees Celsius, the temperature increases once every float voltage should be reduced 3MV. Similarly, every increase in temperature of less than once in order to avoid charging voltage should rise 3MV. Discharge end voltage at full load (<30 minutes) to 1.67V under each section. In the low discharge rate conditions (low current discharge time) increased to 1.7V-1.8V to each section, APC SYMMETRA can adjust the charge voltage according to load.
d: after discharge within 72 hours if the battery does not recharge. Sulfate will be attached to the insulating plates charge and damage the battery.
e: float or are rechargeable batteries, the battery internally generated gas into water electrolysis in the cathode plate, thereby maintaining the capacity of the battery and no additional water. However, corrosion of the battery plate will reduce the battery capacity.
f: battery separator life at ambient temperature is 30-40 degrees, only 5-6 months. Prolonged storage of the battery must be charged every 6 months time. Batteries should be stored in a dry cool environment. Environment at 20 degrees maintenance-free battery self-discharge rate of 3-4% per month, and varies with temperature.
g: maintenance-free batteries are equipped with safety valves, when the battery internal pressure increases to a certain degree, the safety valve can automatically rule out the excess gas and pressure recovery within the safety valve will automatically resume.
h: battery cycle life (charge and discharge frequency of life) depends on discharge rate, discharge depth, and recovery of charge by means of which the most important factor is the depth of discharge. In the discharge rate and time certain, the more shallow depth of discharge, the longer the battery life cycle. Maintenance-free battery at 25 degrees under 100% deep discharge cycle life of about 200.
i: battery life when on arrival showed capacity fading, the internal short circuit, shell deformation, plate corrosion, open circuit voltage decreases.
j: IEEE definition of battery life The end of the nominal capacity of less than 80% of AH capacity. Nominal capacity and the actual backup time nonlinear relationship between the 20% reduction in capacity will reduce the number of the corresponding back-up time. Some UPS manufacturers defined as the capacity of the battery end of life reduced to a nominal capacity of 50-60%.
k: the absolute prohibition of different sizes and different battery manufacturers mix, otherwise it will reduce battery life.
l: If the two batteries in parallel use, should ensure that the battery connection, the same bus impedance.
m: maintenance-free battery means you can not add liquid, but regular checks whether the shell cracks, leaks, etc. with or without electrolyte remains necessary.
3: Nickel-cadmium batteries: lead acid batteries of such cells is different from the electrolysis generated when hydrogen and oxygen without corrosive gas, which can be installed next to the electronic device. And consume very little water, generally do not need maintenance. Normal life span of 20-25 years. Expensive than the previously mentioned battery. Initial installation costs about three times the lead-acid batteries. And high ambient temperature will not affect battery life, and will not be affected by environmental temperature is low battery capacity. Each section of the general voltage 1.2V, UPS needs to be designed for applications such battery chargers high voltage.
2: the advantages and disadvantages
An open lead-acid battery:
Advantages: less investment, more maintenance-free battery life long, low temperature requirements.
Disadvantages: maintenance of a more complex one that requires a special battery rooms, corrosive gas emissions must be on site 50-90 hours of initial charging, need to hand maintenance.
2: maintenance-free battery:
Advantages: no added liquid such as maintenance, can be fully charged state, transport, without hand maintenance.
Disadvantages: not timely recovery of charging will damage the battery, temperature sensitive, short-lived, expensive than lead-acid batteries.
3: Nickel-cadmium batteries:
Advantages: low maintenance requirements, longer life expectancy is not sensitive to temperature, no harmful gas emissions.
Disadvantages: the most expensive of three batteries.
3: UPS battery used
Most use the computer center are generally maintenance-free batteries, maintenance more convenient, but also in need of the following:
1: to discharge every three to four months time, to prevent electrode oxidation.
2: The ambient temperature should be maintained at 20-25 degrees.
3: The connection can not be too tight and too loose, need regular checks.
4: Use the three years to replace the need for timely inspections.
