Lithium battery separator specific indicators—Puncture strength

    This parameter is actually a requirement due to the insufficient level of the electrode surface and the limited technological level during the assembly process. Therefore, the diaphragm is required to have a considerable puncture strength. The puncture strength test has an industry standard to follow, which is roughly at a certain speed ( 3-5 meters per minute), let a needle with a diameter of 1 mm without sharp edges pierce the annular fixed septum to penetrate the septum. The maximum force applied to the needle is called the puncture strength. Similarly, because the method used in the test is very different from the actual battery situation, it is not particularly reasonable to directly compare the puncture strength of the two types of separators, but with a certain microstructure, the puncture strength is relatively high. , Its assembly defect rate is low. However, the pure pursuit of high puncture strength will inevitably lead to the degradation of other properties of the diaphragm.