1.5v dry cell battery

　　What are the testing methods for 1.5v dry cell battery separator technology?

　　1.Thickness

　　There are two main online control technologies for 1.5v dry cell battery separator thickness, one is MD (longitudinal) control and CD (transverse) control; the other is separator online machine vision inspection technology. The so-called MD control and CD control refer to the closed-loop thickness control in the MD direction by controlling the feeding screw speed or traction speed; and the data measurement through the scanning frame, and finally the closed-loop data control in the CD direction.

　　2. Curvature

　　Some companies also call it camber, which refers to the arc produced after slitting the 1.5v dry cell battery separator. When the arc is obvious, it will cause the lamination to be uneven, and a vortex will be generated during winding, causing the pole pieces to be exposed and cause short circuits. The test method is to lay the diaphragm strip flat on the table and compare the parallelism with the edge of the steel ruler to get the curvature of the diaphragm.

　　3. Breathability

　　The time required for a certain volume of air to pass through the diaphragm under certain conditions is also called the Gurley value. Its size has a certain impact on the performance of lithium batteries. The ASTM test method is generally used.

　　4.Porosity

　　The volume of the void accounts for the proportion of the entire volume. The test methods include the liquid absorption calculation method and the test method. The liquid absorption calculation method is to immerse the 1.5v dry cell battery separator in a known solvent, and calculate the amount of the separator occupied by the liquid by measuring the mass difference before and after the separator is infiltrated. Void volume, mercury intrusion testing method uses external force to apply pressure on the diaphragm to press mercury into the pores of the diaphragm, and then calculates the porosity of the diaphragm by measuring the volume of mercury pressed into the diaphragm. After multiple measurements, the average value is taken.

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