Polyester Film, Resin Current Collector, Resin Current Collector For Bipolar Battery, Electrode For Hyperbolic Battery, Energy Storage Element, Secondary Battery, Electric Vehicle, And Electric Flying Object

Abstract: The present invention addresses the problem of providing a polyester film with excellent conductivity, uniform conductivity in the thickness direction within the film plane, and minimal reduction in conductivity due to processing, and a resin current-collector for a bipolar battery with minimal variation in battery characteristics, and solves the problem with a polyester film that satisfies (1) to (3) below. (1) A volume resistivity at 23°C and 65% RH of 1.0×100 Ocm or greater and less than 1.0×108 Ocm. (2) A film thickness of 1 µm or more and less than 500 µm. (3) Having a polyester resin layer (P1 layer) containing 1.0-30 mass% of conductive particles, the conductive particles being a carbon material.

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