Measurement device and measurement method for measuring roundness of coating roll for manufacturing battery

A roundness measuring device of a coating roll that supports an electrode sheet when the electrode sheet is coated with an electrode slurry, the roundness measuring device comprising:

• a displacement sensor spaced apart from the coating roll and configured to measure roundness of the coating roll in a non-contact manner;
• a support member on which a displacement sensor is installed, wherein the support member extends in a length direction of the coating roll, and
• a linear movement mechanism configured to move the displacement sensor forward and backward to allow the displacement sensor to approach and be separated from the coating roll,
• wherein the displacement sensor includes a plurality of displacement sensors on the support member in the length direction of the coating roll, and
• wherein the linear movement mechanism is mounted on the support member.