Views: 0 Author: Site Editor Publish Time: 2021-10-04 Origin: Site
No matter in the development of the power industry or the safe and stable operation of the power supply system, the DC power supply of the secondary system plays a very important role, and the battery in the DC system is called the "heart" of the substation, which is the last defense line to ensure the safety of the power supply system. As a backup power supply, the role of the storage battery is to provide backup power for the secondary protection system in case of power failure such as charger failure, ensure the normal operation of important equipment. AGM battery is a kind of battery whose separator is made of superfine glass wool. Valve regulated lead acid battery (VRLA) is widely used in various power plants and substations because of its maintenance free advantages. The combination of the two is AGM valve controlled sealed lead-acid battery, which combines the advantages of the two batteries well.
Here is the content list:
What is the structure of the AGM VRLA battery?
What is the working principle and process of the AGM VRLA battery?
What is the classification of AGM VRLA battery?
AGM VRLA battery is mainly composed of shell, grid, bulkhead, manifold, safety valve, positive and negative plate, sulfuric acid electrolyte, pole terminal, etc. The positive and negative plates are the areas of electrochemical reaction, which are formed by coating lead paste on the grid plate, curing, forming and other processes. The active ingredient of the positive plate is lead dioxide, and the active ingredient of the negative plate is spongy lead. The clapboard is made of superfine glass wool. The safety valve is a kind of exhaust device, which releases excess gas to maintain the air tightness and liquid tightness of the battery, and keeps the internal pressure of the battery in the best safe range. The battery pole terminal is connected with the load to conduct current. The battery tank and shell are made of flame retardant material.
The working principle of AGM valve regulated lead-acid battery is basically following the traditional lead-acid battery. The positive active material is lead dioxide (PbO2), the negative active material is spongy lead, and the electrolyte is dilute sulfuric acid (H2SO4). There is hydrolysis reaction in the charging process. Due to the release of hydrogen and oxygen, if the gas produced by the reaction can’t be reused, the battery will lose water and dry up. Therefore, AGM VRLA battery has made important improvements in structure and material. As antimony-free lead-calcium-tin-aluminium quaternary alloy is used, the overpotential of hydrogen precipitation at the negative electrode is increased and the precipitation of hydrogen is inhibited. At the same time, a special safety valve is used to keep a certain internal pressure of the battery. The ultra-fine glass fiber cotton (AGM) separator is used. The cathode absorption technology is used. Through the lean liquid design, the gas channel is reserved between the positive and negative poles and in the separator. Therefore, when charging under the specified charging voltage, the oxygen released from the positive electrode can be transferred to the surface of the negative plate through the partition channel and reduced to water.
This is the unique internal oxygen circulation reaction mechanism of AGM VRLA battery. This charging process makes the water in the electrolyte almost no loss, so that the battery does not need to add water in the process of use.
At present, there are two types of VRLA batteries. They are two different ways to fix the sulfuric acid electrolyte, namely, the ultrafine glass fiber cotton (AGM) separator and the silicone gel. Both of them use the principle of cathode absorption to seal the battery, but the channels for oxygen released from the positive electrode to reach the negative electrode are different. For AGM VRLA batteries, although most of the electrolyte of the battery is kept in the AGM diaphragm, 10% of the diaphragm pores must not enter the electrolyte. The oxygen generated by the positive electrode is absorbed by the negative electrode through this part of the pore to the abdominal muscle.
Because of its excellent characteristics such as long life, extremely low self-discharge rate, sufficient capacity, wide operating temperature range, and good sealing performance, AGM valve regulated lead-acid batteries are widely used in communication systems, power systems, emergency lighting systems, Automatic control systems, fire and security alarm systems, energy systems, computer backup power supplies, portable instruments and medical system equipment and other diverse fields. Champion Power Technology Co., Ltd. is one of the leading lead-acid battery manufacturers in China, specializing in the research, production and sales of lead-acid batteries. If you are engaged in AGM VRLA battery industry, you can consider our cost-effective products.
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