Celgard LLC, a subsidiary of Polypore International, is a global leader in the development and manufacture of high-performance microporous membranes used as separators in lithium-ion batteries — a critical component in EV high-voltage battery pack assemblies. Operating as a sub-tier material supplier within the electrification supply chain, Celgard's separator technology directly enables the safety, energy density, and cycle life of advanced battery cells procured by Tier 1 battery pack integrators. The company is widely recognized as a foundational enabler of EV electrification, supplying proprietary dry-process and wet-process separator films to leading cell manufacturers worldwide.
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