Constant-gap rolling mechanism and rolling method thereof

Abstract

The invention relates to the field of new energy, in particular to a constant-gap rolling mechanism and a rolling method thereof. The rolling mechanism comprises an upper roller shaft, a lower roller shaft and auxiliary mechanisms, the auxiliary mechanisms are arranged on the left side and the right side of the lower roller shaft respectively, a groove is reserved between the lower roller shaft and the surface of each auxiliary mechanism, and the groove is sleeved with a circular rubber ring. According to the constant-gap rolling mechanism and the rolling method thereof provided by the invention, the auxiliary mechanisms are additionally arranged on the two sides of the lower roll shaft, when the upper roll shaft and the lower roll shaft are extruded and deformed after pressurization and the auxiliary mechanisms on the two sides of the lower roll shaft make contact with the upper roll shaft, stress on the two sides is increased, the cambered surface of the roll surface which is bent and deformed originally is adjusted back after being subjected to limiting pressure on the two sides, and it is guaranteed that the roll surfaces are parallel; due to the protection of the limiting edges on the two sides, the stress of a pole piece is kept consistent with that of the middle, so that the wave and thickness range of extrusion deformation is small, and single-face and double-face alternation can meet the requirement under the control of a constant gap.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a constant gap rolling mechanism and a rolling method thereof. Background technique [0002] In the existing technology of battery pole piece technology, pole piece compaction is a fixed technology application in the industry. In the case of conventional batteries and low-rate charge and discharge, the actual compaction value of the negative electrode material in the single-sided area can only reach 85% of the design value. %; both sides can reach 100% of the design value; the problem of low compaction on one side is not obvious. In the fast charging system, the defect of low compaction on one side is more obvious. Lithium is first decomposed in the battery area, which leads to poor overall cycle retention rate of the battery, excessive battery thickness expansion, excessive consumption of free electrolyte, and eventually battery cycle diving and battery failure. [0003] In the tradit...

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Problems solved by technology

[0002] In the existing technology of battery pole piece technology, pole piece compaction is a fixed technology application in the industry. In the case of conventional batteries and low-rate charge and discharge, the actual compaction value of the negative electrode material in the single-sided area can only reach 85% of the design value. %; both sides can reach 100% of the design value; the problem of low compaction on one side is not obvious. In the fast charging system, the defect of low compaction on one side is more obvious. Lithium is first decomposed in the area, which leads to poor overall cycle retention rate of the battery, excessive battery thickness expansion, excessive consumption of free electrolyte, and eventually battery cycle diving and battery failure.

[0003] In the traditional equipment structure, the combination of the upper roller shaft and the lower roller shaft, the deformation of the upper and lower pressure + the left and right deformation of the roll is extruded and deformed after the roll is stressed, and the thickness of the edge becomes thinner, and the curved roll surface presents an arc. When the small gap is pressed, the arcs on both sides of the roller shaft contact and collide, causing damage to the roller shaft; when the large gap is pressed, the pressed pole piece cannot be pressed when the single and double sides are alternated, and it is pulled over instantly, thus causing two situations. :

[0004] 1. The main roller shaft is damaged by the contact and collision of the two sections in the small gap, and the two edges of the pressed pole piece are extruded and deformed to form a wavy edge with a large thickness difference;

[0005] 2. Large gaps cannot be pressed alternately on both sides during rolling, the thickness is uncontrollable, and the compaction ratio of single and double sides is inconsistent. After cycling, the lithium battery fails.

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