| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery separator with high shape holding ability even when heat is generated by some trouble by laminating a porous resin layer on at least one surface of a porous supporting body having liquid retainability. SOLUTION: A porous resin layer 1 is laminated on at least one surface of a porous supporting body 2 capable of retaining a liquid such as an electrolyte to form a battery separator. The porous resin layer 1 has micropores 3. The porous supporting body 2 and the porous resin layer 1 are laminated through an adhesive or the like. As the porous supporting body 2, cellulose paper is used, and as the porous resin layer 1, polyethylene, polypropylene, or polyethylene terephthalate or the like is used. The thickness of the porous supporting body 2 is preferable to be about 2-200μm, and that of the porous resin layer 1 is preferable to be about 0.1-100μm. The diameter of the pore 3 of the porous resin layer 1 is preferable to be about 0.1-100μm, and the rate of hole area is preferable to be about 15-80%.
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