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

A pole piece flattening equipment, the flattening equipment comprising a nip roller, the nip roller comprising:

• a roller body, wherein a 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 an axis of the roller body, of the first part is provided with part of a first thread structure, a surface, away from an axis of the roller body, of the second part is provided with part of a second thread structure, and a rotation direction of the first thread structure is opposite to that a rotation direction of the second thread structure;
• the first thread structure on the first parts of the ridges are the same in rotation direction, and the second thread structure 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, a number of teeth of the first thread structure on the first parts located on the plurality of ridges sequentially arranged at intervals is sequentially increased, and a number of teeth of the second thread structure on the second parts located on the plurality of ridges sequentially arranged at intervals is sequentially increased.

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

• a roller body, wherein a 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 an axis of the roller body, of the first part is provided with part of a first thread structure, a surface, away from an axis of the roller body, of the second part is provided with part of a second thread structure, and a rotation direction of the first thread structure is opposite to that a rotation direction of the second thread structure;
• the first thread structure on the first parts of the ridges are the same in rotation direction, and the second thread structure 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, a number of teeth of the first thread structure on the first parts located on the plurality of ridges sequentially arranged at intervals are sequentially increased, and a number of teeth of the second thread structure on the second parts located on the plurality of ridges sequentially arranged at intervals are sequentially increased.