Roll-in device

Abstract

The invention provides a roll-in device. The roll-in device comprises an unwinding mechanism, a roll-in mechanism, a winding mechanism and a stretching mechanism, wherein the unwinding mechanism is wound by a pole piece to be rolled, the pole piece to be rolled is output, the pole piece to be rolled is provided with a foil piece and a film layer arranged on at least one face of the foil piece, the corresponding face, provided with the film layer, of the foil piece is provided with at least one film coating zone and a foil-exposed zone, the film coating zone extends in the longitudinal direction of the foil piece, the foil-exposed zone is located in the lateral direction of the film coating zone, the film layer is arranged on the film coating zone of the foil piece, and no film layer is arranged on the foil-exposed zone of the foil piece. The roll-in mechanism comprises a compression roller and a back roller, wherein the compression roller and the back roller are oppositely arranged and used for rolling the pole piece. The winding mechanism is used for winding the rolled pole piece. The stretching mechanism is arranged between the roll-in mechanism and the winding mechanism. The stretching mechanism comprises two guide rollers and a concave-convex roller located between the two guide rollers. A wrap angle is formed by the concave-convex roller and the two guide rollers. The concave-convex roller is matched with the pole piece in size, so that the convex portion of the concave-convex roller acts on the portion, with the foil-exposed zone, of the foil piece and plastic deformation of the portion, on the foil-exposed zone, of the foil piece is achieved.

Description

technical field [0001] The invention relates to the field of lithium ion battery production equipment, in particular to a rolling device. Background technique [0002] The pole piece preparation process of lithium-ion batteries usually includes pulping, coating, drying, rolling, cutting and other processes. Although the manufacturing process of different manufacturers or different batteries may vary, the pole piece rolling is essential. Less process. The pole piece reaches a certain compaction density after rolling, which is very important for improving the energy density of lithium-ion batteries. However, after rolling a coated pole piece, there is often the problem of wrinkling of the foil of the pole piece at the longitudinal edges between each coated zone and the adjacent empty foil zone. This is mainly due to the fact that after the lithium-ion battery pole piece coating is completed, during the rolling process, the roller pressure on the film layer at the coating are...

AI Technical Summary

Problems solved by technology

However, the current striped pole piece adopts the cold pressing technology of the roller structure, and there will also be a problem that the foil of the pole piece will wrinkle at the longitudinal edge between each coated film area and the adjacent empty foil area.

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