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

Pole piece flattening equipment, comprising the nip roller which comprises:

• a roller body, wherein the side surface of the roller body is provided with a plurality of ridges protruding in a radial direction of the roller body, and extension directions of the plurality of ridges are all parallel to an axial direction of the roller body;
• each ridge is provided with a first part and a second part which are sequentially arranged in the extension direction of the ridge, wherein a surface, away from the axis of the roller body, of the first part is provided with part of first threads, a surface, away from the axis of the roller body, of the second part is provided with part of second threads, and a rotation direction of the first threads is opposite to that of the second threads;
• the first threads on the first parts of the ridges are the same in rotation direction, and the second threads on the second parts of the ridges are the same in rotation direction;
• and
• the plurality of ridges are sequentially arranged at intervals in a rotation direction of the roller body, lead angles of the first threads on the first parts located on the plurality of ridges sequentially arranged at intervals are sequentially decreased, and lead angles of the second threads on the second parts located on the plurality of ridges sequentially arranged at intervals are sequentially decreased.

A pole piece production system, comprising a pole piece flattening equipment which comprises a nip roller, comprising:

• a roller body, wherein the side surface of the roller body is provided with a plurality of ridges protruding in a radial direction of the roller body, and extension directions of the plurality of ridges are all parallel to an axial direction of the roller body;
• each ridge is provided with a first part and a second part which are sequentially arranged in the extension direction of the ridge, wherein a surface, away from the axis of the roller body, of the first part is provided with part of first threads, a surface, away from the axis of the roller body, of the second part is provided with part of second threads, and a rotation direction of the first threads is opposite to that of the second threads;
• the first threads on the first parts of the ridges are the same in rotation direction, and the second threads on the second parts of the ridges are the same in rotation direction;
• and
• the plurality of ridges are sequentially arranged at intervals in a rotation direction of the roller body, lead angles of the first threads on the first parts located on the plurality of ridges sequentially arranged at intervals are sequentially decreased, and lead angles of the second threads on the second parts located on the plurality of ridges sequentially arranged at intervals are sequentially decreased.