NONAQUEOUS ELECTROLYTE SECONDARY BATTERY SEPARATOR, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY MEMBER, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
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United States of America Patent
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May 6, 2021
app pub date -
Nov 3, 2020
filing date -
Nov 6, 2019
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Abstract
An object of an embodiment of the disclosure is to provide a nonaqueous electrolyte secondary battery separator having an excellent withstand voltage property. A nonaqueous electrolyte secondary battery separator in accordance with an embodiment of the disclosure includes a polyolefin porous film having a thickness of 4 μm to 40 μm. The polyolefin porous film does not break in a puncture test in which a pin having a diameter of 1 mm and a tip radius of 0.5R is thrust at a speed of 1 mm/s to a depth of 2.5 mm.
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