Why does VRLA battery need tight assembly?

The electrolyte of valve regulated lead acid battery is in a lean state, that is, most of the electrolyte is adsorbed in the superfine glass fiber membrane, and the rest is absorbed by the electrode plate. In order to ensure that oxygen can diffuse to the negative electrode smoothly, the active substances of the membrane and electrode plate are required not to be saturated by the electrolyte, otherwise it will block the oxygen passage through the membrane, affecting the reduction of oxygen on the negative electrode. In order to make the chemical reaction go on normally, the active substance on the electrode plate must be fully contacted with the electrolyte, while the battery with electrolyte poor structure can only achieve this purpose by tight assembly.

The tight assembly method has three advantages:

• The first is to make the separator closely contact with the electrode plate, which is conducive to the full contact between the active substance and the electrolyte;

• Second, keep the active substances on the electrode plate, especially reduce the shedding of positive active substances;

• The third is to prevent the oxygen released from the positive electrode at the end of charging from escaping to the top of the battery along the surface of the electrode plate, so that the oxygen can be fully diffused to the negative electrode and absorbed, so as to reduce the loss of water.

Small capacity valve regulated lead acid batteries are usually made into battery packs, which are internally connected. A cover on the safety valve is connected to the battery shell through several points, leaving a gap for gas escape. Therefore, there is no connecting strip and safety valve on the valve regulated lead acid battery cover, only positive and negative poles.

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