The diaphragm is an important raw material used in the production of lithium-ion batteries. Its main function is to separate the positive and negative electrodes and serve as a channel for ions to travel back and forth between them. The microporous structure on the diaphragm is the key pathway for these ions to move between the positive and negative electrodes, and its breathability directly affects the battery's performance.

      The breathability index of the battery diaphragm is a crucial indicator that affects the internal resistance performance of the battery, reflecting the diaphragm's permeability. Therefore, testing the breathability of the battery diaphragm is an important task in the design and manufacturing of lithium-ion batteries.

       Today, Putron Industrial Technology will provide a detailed introduction to the testing methods and related equipment for the breathability of lithium battery diaphragms, based on the GB∕T 36363-2018 standard for polyolefin diaphragms used in lithium-ion batteries.

      Related keywords: Battery diaphragm breathability testing methods, Lithium battery diaphragm breathability tester, Battery diaphragm breathability measuring instrument, Battery diaphragm breathability testing solutions, Polyolefin diaphragm breathability tester for lithium-ion batteries

       I. Breathability

       Under standard temperature, humidity, and atmospheric pressure conditions, with the testing instrument applying a pressure of 1.21 kPa, the time required for 100 ml of air to pass through a 6.45 cm2 diaphragm.

      II. What testing instrument is used for battery diaphragm breathability testing?

      The lithium battery diaphragm breathability tester PAPT-B01, developed and produced by Putron Industrial Technology, is used for testing the breathability performance of battery diaphragms. This testing machine offers three testing methods: Gurley method, Schopper method, and Bendtsen method.

Lithium Battery Diaphragm Breathability Tester

III. Testing procedure and operation method for lithium battery diaphragm breathability testing

1. Cut three diaphragm samples along the longitudinal direction at intervals of 150 mm from the membrane roll. If the diaphragm width is ≥100 mm, the sample size should be 100 mm x 100 mm; if the diaphragm width is <100 mm, the sample size should be 100 mm x diaphragm width.

2. Place the diaphragm into the testing head of a breathability tester with an appropriate range to conduct the breathability test. Take the average of three test results as the diaphragm's breathability.

Lithium batteries have very strict requirements for diaphragm breathability performance, as it directly affects the battery's electrochemical performance and safety. Therefore, testing the diaphragm's breathability is an important means to evaluate and judge the quality of a diaphragm.

Lithium battery diaphragm breathability testing method:https://www.paratronixcn.com/services/show-218.html