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Nail penetration test

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posted on 05.04.2021, 02:11 by Noriko Kasai, Makoto Kato, Naoya Ishida, Naoto Kitamura, Yasushi Idemoto
For the nail penetration test, three types of pouch cells with different separators were assembled. The positive electrode is LiMn1/3Ni1/3Co1/3O2, the negative electrode is graphite, and the separator is PP-PE-PP or coated PE or coated nonwoven. At the fully charged state of 4.3V, a 4.5mm diameter nail was pushed into the cell at a penetration speed of 20mm/s. The results of the nail penetration test varied significantly depending on the type of separator.

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Manuscript title

Safety Test Methods Simulating Internal Short Circuit and the Mechanism for Safety Improvement of Li-ion Batteries by Heat Resistant Separators