Flattening roller, pole piece flattening equipment and pole piece production system

The utility model discloses a flattening roller, pole piece flattening equipment and a pole piece production system. The flattening roller comprises a roller body, wherein a plurality of raised lines are arranged on the side surface of the roller body; the raised line is provided with a first part and a second part, the first part is provided with partial first threads, the second part is provided with partial second threads, and the rotation direction of the first threads is opposite to that of the second threads; the rotation directions of the first threads on the first parts of the raised lines are the same, and the rotation directions of the second threads on the second parts of the raised lines are the same; the multiple protruding strips are sequentially arranged at intervals in the rotating direction of the roller body, the lead angles of the first threads located on the first parts of the multiple protruding strips sequentially arranged at intervals are sequentially decreased, and the lead angles of t