Rolling device

Abstract

The invention provides a rolling device, which comprises a rolling mechanism for rolling a strip, wherein the rolling mechanism comprises a first pressing roller and second pressing roller which are oppositely arranged. The strip comprises a substrate and a coating layer, wherein the substrate is provided with an exposed blank area and a covered area covered by the coating layer; the blank area and the covered area both extend in the longitudinal direction and alternate in the transverse direction. And the diameter of the second pressing roller is larger than that of the first pressing roller.The first pressing roller comprises a roller body with an annular rolling area formed on the outer peripheral surface; and an annular convex part arranged on the roller body and protrudes outwards relative to the outer peripheral surface of the roller body. The rolling area and the annular convex part are alternately arranged; the annular convex part of the first pressing roller and the second pressing roller are used for rolling the blank area of the substrate, and the rolling area of the roller body and the second pressing roller are used for rolling the covered area of the substrate and the coated layer of the strip.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a rolling device. Background technique [0002] At present, major car manufacturers have higher and higher requirements for electric vehicle batteries. One of the most important points is the energy density of the battery. will increase accordingly. [0003] The battery includes pole pieces, and in order to increase the energy density of the battery, it is usually necessary to roll the pole pieces. refer to Figure 6 , the existing pole piece (a kind of strip S) includes a substrate S1 and a coating S2 disposed on the substrate S1, the substrate S1 has an exposed blank area S11 and a coverage area S12 covered by the coating S2. However, during the rolling process, the blank area S11 of the substrate S1 is not subjected to pressure, so it will not elongate, while the coverage area S12 of the substrate S1 will be elongated by compression, thus resulting in different areas of th...

AI Technical Summary

Problems solved by technology

However, during the rolling process, the blank area S11 of the substrate S1 is not subjected to pressure, so it will not elongate, while the covered area S12 of the substrate S1 will be elongated by compression, thus resulting in different areas of the substrate S1. The elongation rate is different, the blank area S11 of the substrate S1 is easy to wrinkle, and it will cause uneven winding of the pole piece, and even the next step of processing and production cannot be carried out in serious cases.

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