Maintenance free battery means that it is not required to be overhauled and maintained from the time of delivery to the time when it is in the hands of users until the end of its service life. The maintenance free battery is a sealed single battery and cannot be disassembled. What are the reasons for maintenance free lead-acid batteries?

The increase of fine fiber content in the partition fiber ratio will improve the appearance performance, increase the liquid absorption, increase the penetration speed, and reduce the maximum pore diameter, which is beneficial to the partition.

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 AGM separator shall be selected based on its own performance. According to the analysis of the function of the separator in the battery, the AGM separator shall have high acid absorption capacity, small shrinkage after acid absorption, reasonable microporous structure and low resistivity. According to the comprehensive performance requirements of the battery, the AGM separator should also have the characteristics of low impurity content, high tensile strength, fast infiltration speed, etc.

Absorbing glass fiber separator (AGM separator) is an important part of valve regulated lead-acid battery. Its performance and dosage directly affect the technical performance of the battery, especially the service life of the battery.

AGM is an absorbable fiberglass mesh battery. Vehicles equipped with engine start-stop function are mostly equipped with AGM and EFB reinforced maintenance-free lead-acid batteries. Compared with ordinary batteries (traditional lead-acid batteries), AGM batteries have more advanced technology and can better solve the problem of frequent engine starts. stress, and the growing electrical load on vehicle batteries.

AGM sealed lead-acid battery uses pure sulfuric acid aqueous solution as electrolyte, and its density is 1.29-1.3lg/cm3. Except for a part of the electrolyte absorbed inside the plate, most of it exists in the glass fiber membrane. In order to provide a channel for the oxygen precipitated from the positive electrode to the negative electrode, it is necessary to keep 10% of the pores of the separator that is not occupied by the electrolyte, that is, a lean liquid design. In order to make the electrode plate fully contact the electrolyte, the electrode group adopts the method of tight assembly.

AGM battery refers to the battery whose separator is made of ultra-fine glass wool material. At present, the German department and the American department mainly promote AGM technology. Compared with ordinary batteries, the price is more than three times more expensive, but it has the following advantages: