Electrode manufacturing method

An electrode manufacturing method for manufacturing an electrode by applying electrode ink to an electrode substrate having markings provided at a first interval while conveying the electrode substrate, the method comprising:

• a pre-coating thickness information generation step of measuring a thickness of the electrode substrate at a second interval smaller than the first interval between neighboring two of the markings before applying the electrode ink, and generating a plurality of pieces of pre-coating thickness information including information about a measurement position of one of the two markings;
• a coating step of applying the electrode ink to the electrode substrate after the pre-coating thickness information generation step;
• a post-coating thickness information generation step of measuring the thickness of the electrode substrate at a third interval smaller than the first interval between the two markings in a region to which the electrode ink has been applied, and generating a plurality of pieces of post-coating thickness information including information about the measurement position of the one of the two markings that is same as in the pre-coating thickness information generation step;
• a length ratio calculation step of detecting a length between the two markings in each of the pre-coating thickness information generation step and the post-coating thickness information generation step, and calculating a ratio of the length between the two markings in one generation step of the pre-coating thickness information generation step and the post-coating thickness information generation step to the length between the two markings in the other generation step;
• a measurement position correction step of performing correction by dividing position information measured for each of the plurality of pieces of thickness information in the other generation step by the length ratio calculated in the length ratio calculation step to obtain a plurality of pieces of corrected thickness information in the other generation step;
• a coating thickness calculation step of determining the thickness of the electrode substrate in the other generation step corresponding to the measurement position of the pre-coating or post-coating thickness information in the one generation step as a value on a corrected thickness interpolation line obtained by linearly interpolating the measurement positions of the plurality of pieces of corrected thickness information in the other generation step, and calculating, as a coating thickness, a difference between the determined thickness in the other generation step and the thickness of the electrode substrate at the measurement position in the one generation step;
• and
• a determination step of determining the electrode as a non-defective product if the coating thickness calculated in the coating thickness calculation step is in a predetermined range and determining as a defective product if not in the predetermined range.