The Nail Penetration Test, an internal short circuit test method, is a safety test that tests the internal short circuit tolerance of lithium-ion batteries. The Needle Penetration Test is a test that uses a steel nail through the battery to simulate an internal short circuit to confirm whether the battery is smoking, catching fire, or breaking. In addition, the needling test is not only a test to confirm the safety of the battery, but also a test to understand the basic nature of the battery. In the normal state, the positive and negative electrode sheets of a lithium-ion battery are insulated by a polymer insulating film – the diaphragm – in the organic electrolyte. In this state, a steel nail is inserted in the lithium-ion battery to create a short circuit between the positive and negative electrode plates, forcing an internal short circuit test. The test method is characterized by the ability to adjust the test conditions such as the diameter, material, insertion depth, insert...
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