There are two types of VRLA batteries. Electrolyte (GFL) (referred to as GFL-VRLA battery). They all use the principle of cathode absorption to seal the battery. Therefore, the AGM-VRLA battery needs about 10% of the diaphragm gap. For the GFL-VRLA battery, after the injected silica sol becomes a gel, the skeleton shrinks further, and the viscosity of the silica sol adjusts the gel to about 10 mPa s to make the gel Becomes the anode and allows cracks and penetration between the negative ji plates. The voids or cracks provide a channel for the oxygen released from the positive plate to reach the negative plate.

　　In the production of AGM-VRLA batteries, too much electrolyte will not help the recombination of anode oxygen, while too little electrolyte will increase the internal resistance of AGM-VRLA batteries. If the viscosity of the silica sol is too high, too much silica gel solution is added, which will easily cause excessive cracking of the colloid, thereby increasing the internal resistance of the GFL-VRLA battery. Oxygen recombines at the cathode. Therefore, valve-regulated sealed lead-acid batteries have very strict requirements on the production process.