Why PE battery separator fiber is made into single layer and multi-layer
〓 In order to prolong the cycle life of PE battery separator, it is necessary to ensure that the plate is always in a compressed state during the battery cycle. The PE separator of battery will shrink after the battery is filled with acid or the battery is dehydrated, and the contraction of the separator reduces the pressure between the plates, thus shortening the cycle life of the battery. The bonding force between superfine GLASS FIBERS in the PE battery separator is very small. When the surface tension of water is greater than the bonding force between fibers, the bonding force between superfine GLASS FIBERS will be destroyed; The elasticity of the superfine glass fiber in the PE battery separator is not good enough, so that it cannot be restored to its original state after being compressed.
〓 PE battery separator is composed of polypropylene or polyethylene fiber, which is mixed with low melting point polymer fiber. The separator has good resilience, and can be recovered after being compressed. During the charging and discharging process of the battery, the electrode plate is always in a compressed state, thereby improving the cycle life of the lead-acid battery for electric vehicles. In the production process, the average diameter of coarse fiber is 2-4pm, and the average diameter of fine fiber is usually less than 1 pum, 0.6~0.8um; All fibers are mixed to form a single layer partition, and various fibers are made into a single layer, and then compounded into multiple layers. The thick and thin fibers of different proportions are made into multiple layers partition.
〓 The porosity of PE battery separator is small, and its internal resistance is relatively large. Comparison of some structures and properties of single-layer and multilayer diaphragms. The hole diameter of PE battery separator is reduced, and the tensile strength is increased. The multilayer separator has stronger capillarity and better liquid absorption than the single-layer separator, so acid filling is relatively easy, and acid stratification is eliminated. The battery with multilayer separator has good high current discharge performance, especially at low temperature. The fine glass fiber absorbs liquid relatively slowly and has poor mechanical properties, but the fine fiber structure has good elasticity and can provide lasting pressure on the electrode plate.
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