Uninterruptible power supply (UPS) is a new uninterruptible power supply (UPS) technology developed in recent years. With the rapid development of society and economy, many enterprises and institutions have used UPS, VRLA battery is an important component of UPS section. AGM Battery in UPS can help release energy When the city electricity cut off, into a load device without power outages and continue to be available. So the performance of the battery directly affects the Efficiency of UPS. So it is necessary to carry out detailed study and study.
The working principle of storage battery
(To VRLA batteries as an example)
1) valve-regulated sealed lead-acid battery structure
Positive plate: lead dioxide (PbO2)
Negative plate: sponge-like lead (Pb)
Electrolyte: dilute sulfuric acid (H2SO4)
Ultra-thin glass fiber separator
Lead calcium alloy plate grid
2) The working principle
The positive chemical reactions:
Pb02 + H2S04 + 2H ++ 2e- → PbSO4 + H2O
Negative chemical reaction occurred:
Pb + H2S04 → PbSO4 + 2H ++ 2e-
Total internal chemistry of the battery:
UPS power supply system in the valve-regulated sealed lead-acid battery
1) UPS in the valve-regulated sealed lead-acid battery voltage set UPS Three-phase into line,Three-phase out line;Three-phase into line,one-phase out line;one-phase into line,one-phase out line;Three ways of connecting structure. No matter which one must be strictly in accordance with the number of equipment suppliers for equipment storage battery and voltage requirements to set.
2) UPS power supply system of storage battery capacity configuration of battery capacity in practical use is associated with many factors, such as charge saturation, ambient temperature, discharge current size, battery life and so on.
General application of the following formula:
The formula: C is the battery capacity, t is the battery discharge time, S is the UPS capacity, cosφ is the power factor, E is the battery voltage, N is the number of batteries, η is the efficiency of the UPS.
(1) Check the battery bracket is firmly installed, the connection screw is tightened, to exclude the damage caused by abnormal use of the shell.
(2) to ensure positive and negative safety clearance between the column.
(3) pole connection between the pole to be strong, the contact should be consistent, if necessary, to smear Vaseline or conductive paste, wire diameter to meet the requirements.
Ensure the ambient temperature
(1) Ambient temperature suitable to ensure that the rated terminal voltage of the battery, see the following table:
(2) suitable for the ambient temperature will ensure that the rated capacity of the battery with temperature changes The battery capacity has the following formula:
C25: The rated capacity of the battery when the ambient temperature is 25 ℃
C15: The capacity of the battery when the ambient temperature is 15 ℃
K: temperature coefficient, generally take 7 ‰ ~ 9 ‰
By the above formula we can see: the temperature will ensure that the appropriate battery capacity closer to the rated capacity.
(1) floating charge:The electrolyte,the plate mixed with impurities, the formation of internal self-discharge, floating charge is to offset the self-discharge caused by battery power loss. The battery is in A full charge state..
(2) Equalized Charging: due to individual reasons, the degree of self-discharge will be different, floating after the battery capacity of each battery will not reach unity. Regularly increase the float charge voltage to achieve a recharge, so that each battery to restore the original capacity.
According to battery capacity, performance, and comprehensive load equipment set down electromechanical pressure value of end voltage;When the mains power electricity cut off To ensure that the important equipment in the first.Can break the Not important equipment when necessary.