Method of evaluating insulation of overlay part

A method for evaluating insulation of an overlay part in an electrode for evaluation wherein an insulation coating layer has been laminated on an inclined portion of an electrode mixture layer, wherein the electrode mixture layer is formed on an electrode current collector, wherein the inclined portion of the electrode mixture layer formed on the electrode mixture layer at an end of the electrode mixture layer having a gradually decreasing thickness, and wherein the overlay part is a portion of the insulation coating layer on the inclined portion of the electrode mixture layer, the method comprising:

• applying and drying an insulation coating liquid on a flat upper surface of a simulated electrode mixture layer to form a simulated overlay part, and collecting first data about a first length of a first gap between a first applicator applying the insulation coating liquid and the flat upper surface of the simulated electrode mixture, a first thickness which has been increased by applying and drying the insulation coating liquid on the simulated electrode mixture layer of the simulated overlay part, and a capacity of the simulated overlay part;
• applying and drying the insulation coating liquid on flat upper surface of a current collector to form a simulated pure insulation coating layer, and collecting second data about a second length of a second gap between a second applicator that applies the insulation coating liquid and the flat upper surface of the current collector, and a second thickness of the pure insulation coating layer on the current collector;
• generating a first relation between the second thickness of the simulated pure insulation coating layer and the capacity of the simulated overlay part based on the first data and the second data;
• measuring a thickness of a pure insulation coating layer of the electrode for evaluation;
• and
• determining a capacity of an overlay part of the electrode for evaluation from the measured thickness of the pure insulation coating layer of the electrode for evaluation using the generated relation,
• wherein the generating the first relation comprises:
• deriving a second relation between the first thickness and the capacity of the simulated overlay part based on the first data about the capacity of the simulated overlay part according to the first thickness;
• deriving a third relation between the first thickness and the second thickness based on the first data about the first length and the first thickness, and the second data about the second length and the second thickness;
• and
• deriving the first relation between the second thickness of the simulated pure insulation coating layer and the capacity of the simulated overlay part by combination of the second relation and the third relation, wherein the combination of the second relation and the third relation includes eliminating the first thickness to derive the first relation.