The effect of separator on battery performance

The quality of the separator will directly affect the capacity, charge-discharge cycle life and self-discharge performance of the battery. The analysis results of the battery show that the main reason for the low cycle life of the battery is that the diaphragm with poor quality has a relatively large pore size, and the pore size distribution and thickness are not uniform, so as the charging and discharging progress, the positive lead powder gradually penetrates a small amount The separator goes to the side of the negative electrode, and the negative lead dendrite may penetrate the separator and eventually cause a chronic short circuit of the battery. Therefore, with the progress of charge and discharge, the capacity of the battery gradually decreases and fails. From the dissection of the battery after the end of life, it can be seen that the side of the separator near the negative pole turns reddish brown, indicating that a small amount of lead powder has penetrated through the separator. 

 It is worth emphasizing that the quality of the selected separator plays a crucial role in preventing chronic short circuit of the battery. A better separator has good resistance to dendrite penetration and oxidation, and has a small and uniform pore size and a moderate porosity, which can significantly reduce the charge termination current, prolong the battery life and reduce the battery self-discharge rate. 

 The resistance of the separator directly affects the working voltage and discharge capacity during discharge. The separator with large resistance causes the working voltage to drop when the battery is discharged, and the discharge capacity of the battery is also low. Therefore, the resistance of the battery separator we use must be small. 

 In summary, we believe that the advantages and disadvantages of battery separators are an extremely important factor affecting the charge and discharge life of lead batteries, the size of self-discharge, and the level of capacity. Therefore, in the production process of batteries, according to the characteristics of different batteries, Reasonably select the required battery separator.

--End--