Comparison of two valve-regulated sealed lead-acid batteries
There are currently two main types of VRLA batteries, namely, glass fiber separator cathode absorption sealed lead batteries (such as GNB, Hawke batteries) and silicone gel sealed lead batteries (such as German solar batteries). It is a big country, but it is not yet a powerful country.
Comparison of two valve-regulated sealed lead-acid batteries
The two battery plates are the same: the positive grid is made of lead-calcium-tin-aluminum quaternary alloy or Low antimony multi-element alloy, the negative grid adopts lead calcium tin aluminum quaternary alloy. And using tight fitting and lean liquid design, a one-way safety valve is set in the upper cover of the battery. Due to the use of antimony-free lead-calcium-tin-aluminum quaternary alloy, the overpotential of hydrogen evolution at the negative electrode is increased, thereby inhibiting the precipitation of hydrogen. At the same time, a special safety valve is used to keep the battery at a certain internal pressure.
The two battery separators are different: that is, two different methods, namely, ultra-fine glass fiber wool (AGM) separator and silicone gel, are used to 'fix' the sulfuric acid electrolyte. They all use the principle of cathode absorption to seal the battery, but the channels provided for the oxygen released from the positive electrode to reach the negative electrode are different. For AGM sealed lead-acid batteries, although most of the electrolyte of the battery is kept in the AGM diaphragm, it is necessary to prevent the electrolyte from entering 10% of the pores of the diaphragm. The oxygen generated by the positive electrode reaches the negative electrode through this part of the pores and is absorbed by the negative electrode.
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