BATTERY SEPARATOR AND LITHIUM SECONDARY BATTERY

摘要

[PROBLEMS] A separator is disclosed which enables to inject a nonaqueous electrolytic solution easily during production of batteries such as lithium secondary batteries and also enables to produce a battery which is excellent in various battery characteristics. [MEANS FOR SOLVING PROBLEMS] A battery separator wherein a long porous film is provided with a plurality of non-porous linear regions extending in the width direction of the film and at least one surface of the non-porous linear regions is provided with a recessed portion or a projected portion is advantageously used as a battery separator for lithium secondary batteries or the like.