Abstract: This application relates to a tab flattening device. The tab flattening device includes: a roller configured to convey an electrode plate, a cover, and a flattening portion. The surface of the roller is in contact with the electrode plate in a contact region. The cover surrounds the contact region peripherally and includes a feed-in guide surface oriented toward the contact region. The flattening portion is disposed protrusively on the feed-in guide surface, and located opposite to a tab of the electrode plate. A tab guide surface is formed on the flattening portion. Along a feed-in direction of the electrode plate, the flattening portion is at least partially located upstream of the contact region.

Abstract: A method and a device for testing an electrode sheet, the method may comprise: acquiring M pieces of test data of a tab, wherein the tab protrudes from the end face of the electrode sheet along the first direction, the M pieces of test data are the test data of the tab at M consecutive positions along the second direction, the M pieces of test data are the test data of the height of the tab in the first direction, the second direction is perpendicular to the first direction, and M is a positive integer greater than 1; and determining whether the shape of the tab is normal based on the M pieces of test data.

Abstract: A method and a device for testing an electrode sheet, the method may comprise: acquiring M pieces of test data of a tab, wherein the tab protrudes from the end face of the electrode sheet along the first direction, the M pieces of test data are the test data of the tab at M consecutive positions along the second direction, the M pieces of test data are the test data of the height of the tab in the first direction, the second direction is perpendicular to the first direction, and M is a positive integer greater than 1; and determining whether the shape of the tab is normal based on the M pieces of test data.