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How to charge the VRLA battery?

How to charge the VRLA battery?

2021-06-18

 The charging method of VRLA battery involves how to fully charge the battery, reduce overcharge, reduce undercharge, and prolong life. In terms of maintaining capacity, high initial current is beneficial, and overcharge is minimized to reduce water loss. It can also maintain the activity of positive and negative substances, and pulse charging can overcome the influence of oxidation, so a good charging method can not only maintain the capacity of the VRL A battery, but also significantly increase the cycle life of the battery.

 1.Initial charging

 At this stage, the initial charging of VRLA has the following methods:

 ① Series charging: It should be used by high-voltage and low-current chargers. Generally speaking, the output voltage of the charger is 300V-450V, the current output is 5-30A, the current can be controlled, and the power of each battery can be controlled and discharged This method is commonly used by manufacturers to test battery capacity and eliminate faulty batteries.

 ②Parallel charging: The charger has low voltage and high current, and the current of each battery is related to the charging state and internal resistance of the battery. It is not possible to calculate the amount of electricity charged by each battery. Parallel charging control voltage is hardly adopted by manufacturers.

 ③Series and Parallel hybrid charging:-Generally, it is carried out in series at first and then in parallel. The charger usually has a voltage output of 150V and a current of 30-100A. There is no voltage and current control for a single battery, and it can be grouped for discharge inspection. There are many manufacturers adopted In this way.

 ④Single battery charging: it can accurately charge and discharge, can control current and voltage, can classify and select each battery, and is generally used in testing.

 ⑤Module controls single battery charging: each module can charge 64 batteries, and each charger can charge more than 700 batteries. One or more malfunctions in one module will not affect the charging of other batteries. Constant voltage and constant current can be performed. Ensure that the battery will not be overcharged, and can also check the capacity and perform battery classification, which will be the direction of future development.

 2.Float charging

When the VRLA battery is floating charged, the voltage and current settings are low, so the gas evolution and plate corrosion are not serious. Most of the floating charge adopt constant voltage floating charge, and the setting of each cell is generally about 2.20-2.27V. For the battery pack, the voltage of each single cell during floating charge is different. The battery with high saturation is at a higher voltage and releases gas, and the battery with low saturation is at a lower voltage due to the deoxidation of oxidation. The negative electrode of these batteries may not be fully charged. Floating charge-after some time. The voltage of each cell will be gradually equalized, but the discharge result of the battery may be unsatisfactory.


 If the set value of the float voltage is increased, the battery life will be shortened. If the battery is in a high temperature environment, the risk of thermal runaway may also occur.

 The best way is:

①Charge away from the device. If there are two sets of batteries, charge the battery packs alternately. For battery packs, charge them for a short period of time. Generally, 2.6V/cell is used to ensure that each cell of the battery pack is charged and balanced, and after a period of rest, then float charge.

②Using equalizing charge, discharging the battery pack, using 2.35V/cell for equalizing charge for a period of time, then transfer to floating charge.

 3.Cycle charging

 In the field of cyclic applications, VRLA batteries are designed with thin plates to improve specific energy and high current performance. The best charging method for thin-plate VLRA batteries is pulse and current decreasing. The pulse method can be filled quickly with high input current in a short period of time, and overcharge with little bribery; current decreasing method charging has the same advantages, but the method is completely different. The key to high-current fast charging is the recombination process, which provides sufficient current and overwhelms this process. When the battery being aged, the recombination efficiency becomes more and more intense, but the electrode plates are thin, the surface area is large, the electrode plate spacing is small, and the charging efficiency is high.


 After you read this essay,hope it is helpful for you to charge the VRLA battery, correct way to charge is very beneficial to maintain the battery. 


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