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AssigneeToray Battery Separator Film Co., Ltd.
InventorsNaoki MIZUNO, Koichi MATANO
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Considering that the battery separator of embodiments of the present invention will have thinner materials and lower costs, provided are a polyolefin porous membrane with exceptionally high peel strength between the polyolefin porous membrane and a modified porous layer, suitable for high-speed processing during slit processing and the battery assembly process, and suitable for laminating on a modified porous layer, and a battery separator obtained by laminating a modified porous layer on the polyolefin porous membrane. A polyolefin porous membrane comprising protrusions of polyolefin having a size (W) within a range of 5≦μm≦W≦50 μm and a height (H) within a range of 0.5 μm≦H and irregularly disposed on both sides of the polyolefin porous membrane in a density not less than 3/cm2 and not more than 200/cm2 per side, and the polyolefin porous membrane having a thickness of not more than 25 μm.
A polyolefin porous membrane comprising protrusions of polyolefin, wherein the protrusions have a size (W) within a range of 5 μm≦W≦50 μm and a height (H) within a range of 0.5 μm≦H, wherein the protrusions are irregularly disposed on opposing sides of the polyolefin porous membrane with a density greater than or equal to 3/cm2 per side and less than or equal to 200/cm2 per side, and wherein a thickness of the polyolefin porous membrane is less than or equal to 25 μm.
A battery separator, comprising:
A method of manufacturing a polyolefin porous membrane, the method comprising:
Dependencies are inferred from the claim text.