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The glass fiber separator is made of glass fiber with a diameter of 0.6-3μm and is made by wet process technology. The product has good acid resistance, high porosity, small pore size, high liquid absorption rate, and low resistance. It has the functions of preventing short circuits and adsorbing the required electrolyte. Its free channel allows oxygen to be reconstituted into water on the negative electrode. There is no need to add water during use, and functions such as maintenance-free are realized.
In the beginning, Lead-acid batteries used loose pine partitions, which allowing sulfuric acid to pass through porous partitions unimpeded. However, wood partitions are not resistant to sulfuric acid corrosion and high temperature damage, so their service life is very short. The battery can also use microporous rubber plate, plastic glue partition, resin paper partition, but the performance is better when use glass fiber partition.
- Influence of chemical composition of glass fiber
The chemical composition of glass fiber is one of the key factors affecting the performance of the partition.
- Influence of microfine glass fiber diameter and length
The smaller the diameter of the microfine glass fiber, the larger the surface area, the higher the moisture, so the higher the liquid absorption rate, the smaller the aperture of the partition, the stronger the resistance to dendrite penetration, but its resistance value will increase accordingly, so it must choose an optimal combination. The length of the glass fiber also affects the performance of the partition. Cotton long, fiber is not easy to disperse and flocculation, so that the partition is not uniform; The fiber is short, the partition uniformity is improved, but the strength is low so an optimal length range should also be chosen.
- Effects of harmful impurities in microfine glass fibers
The impurities in the glass fiber have a direct effect on the performance of the partition. The presence of iron, copper, nickel and other metals or metal ions in the glass fiber will increase the self-discharge and gas evolution of the battery. Therefore, raw materials with less harmful impurities must be selected to ensure that the partition has good performance.
- The ratio of coarse and fine fibers also has a great influence on the battery life
In 60%DOD(DeepofDischage) life cycle, the battery life of 100% fine fiber separator is more than three times longer than that of 100% coarse fiber separator. The high proportion of coarse fiber is helpful to improve the high current discharge performance.
- Other influencing factors
Including glass fiber dispersion degree, Internet concentration, fiber vertical and horizontal arrangement ratio, slurry uniformity, drying temperature, etc.
Including glass fiber dispersion degree, Internet concentration, fiber vertical and horizontal arrangement ratio, slurry uniformity, drying temperature, etc.
-Large liquid absorption, fast liquid absorption, good water permeability, and absorb and maintain the electrolyte of the battery's rated original capacity.
-The specific surface area is large and the pore random rate is high. As long as the electrolyte is poor, it can ensure that the oxygen generated by the positive electrode diffuses through the separator to the negative electrode and the reaction product of the negative electrode is combined with hydrogen to generate water, ensuring the need for water in the battery.
-Small pore size can prevent short circuit of the battery and prevent the migration and diffusion of some harmful substances to the electrode through the separator.
-Have good resilience, make the battery pack tightly, reduce the battery volume, prevent the deformation, bending of the electrode plate and the falling off of the active material to ensure the long life of the battery.
-High chemical purity, without any self-discharge impurities.
-Excellent acid resistance and oxidation resistance, to maintain a long battery life.
-Low resistance to ensure the rated capacity of the battery.
