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A kind of rolling method of lithium-ion battery pole piece

A lithium-ion battery and pole piece technology, which is applied in metal rolling and other directions, can solve the problems of poor consistency of battery cell thickness, pole piece rebound, pole piece expansion and rebound, etc., to ensure the rolling effect, improve deformation problems, and reduce expansion rebound effect

Active Publication Date: 2016-04-27
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for rolling lithium-ion battery pole pieces to solve the problem of expansion and rebound of the pole piece due to rolling, thereby improving the deformation phenomenon of the battery.
At the same time, using this method can also ensure the consistency of the thickness of the pole piece, the consistency of the compaction density of the pole piece and the consistency of the thickness of the battery cell, so as to overcome the problem of rolling the pole piece by the rolling method in the prior art. The problem of sheet rebound, and the poor consistency of cell thickness caused by the rolling method in the prior art

Method used

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  • A kind of rolling method of lithium-ion battery pole piece
  • A kind of rolling method of lithium-ion battery pole piece
  • A kind of rolling method of lithium-ion battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 2Shown is a schematic structural view of the rolling equipment used in this embodiment, which includes a first pressing roller 1, a second pressing roller 2 and a third pressing roller 3, and a pressure roller is formed between the first pressing roller 1 and the second pressing roller 2 The first roll gap 12, the second roll gap 23 is formed between the second press roll 2 and the third press roll 3, and the first press roll 1, the second press roll 2 and the third press roll 3 are respectively connected with heating devices. Wherein, the first pressing roller 1, the second pressing roller 2 and the third pressing roller 3 are vertically arranged in a straight line. And the diameters of the first pressing roller 1 , the second pressing roller 2 and the third pressing roller 3 are 400 mm, 500 mm and 400 mm, respectively.

[0034] When the above-mentioned equipment is used to roll the positive electrode sheet 6 of the lithium ion battery (wherein the pos...

Embodiment 2

[0040] Such as Figure 4 Shown is a schematic structural view of the rolling equipment used in this embodiment, which includes a first pressing roller 1, a second pressing roller 2 and a third pressing roller 3, and a pressure roller is formed between the first pressing roller 1 and the second pressing roller 2 The first roll gap 12, the second roll gap 23 is formed between the second press roll 2 and the third press roll 3, and the first press roll 1, the second press roll 2 and the third press roll 3 are commonly connected with a heating device. Wherein, the first pressing roller 1, the second pressing roller 2 and the third pressing roller 3 are arranged in a triangle. And the diameter of the first pressing roller 1 is 500mm, the diameter of the second pressing roller 2 is 600mm, and the diameter of the third pressing roller 3 is 500mm.

[0041] When the above-mentioned equipment is used to roll the positive electrode sheet 6 of the lithium ion battery (wherein the positiv...

Embodiment 3

[0047] Such as figure 2 Shown is a schematic structural view of the rolling equipment used in this embodiment, which includes a first pressing roller 1, a second pressing roller 2 and a third pressing roller 3, and a pressure roller is formed between the first pressing roller 1 and the second pressing roller 2 The first roll gap 12, the second roll gap 23 is formed between the second press roll 2 and the third press roll 3, and the first press roll 1, the second press roll 2 and the third press roll 3 are respectively connected with heating devices. Wherein, the first pressing roller 1, the second pressing roller 2 and the third pressing roller 3 are vertically arranged in a straight line. And the diameters of the first pressing roller 1 , the second pressing roller 2 and the third pressing roller 3 are 1300 mm, 1500 mm and 1300 mm, respectively.

[0048] When the above-mentioned equipment is used to roll the positive electrode sheet 6 of the lithium ion battery (wherein the...

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Abstract

The invention belongs to the technical field of lithium ion batteries, in particular to a rolling method of a lithium ion battery pole piece, which comprises the following steps of: firstly, respectively heating a first press roller, a second press roller and a third press roller to 25 to 200 DEG C; and secondly, rolling the pole piece after coating and drying through a first roller gap formed between the first press roller and the second press roller and a second roller gap formed between the second press roller and the third press roller in sequence, wherein the clearance of the first roller gap is greater than that of the second roller gap. Compared with the prior art, the rolling method of three-roller step continuous hot pressing is adopted, and the pole piece can be rolled to the required thickness step by step only by using less pressure, thereby reducing the extension phenomenon of a diaphragm in the process of rolling, guaranteeing the rolling effect of the coating area of one side of the pole piece, reducing the expansion rebound phenomenon of the pole piece after rolling, and alleviating the problem of deformation of a battery. The pole piece prepared by adopting the rolling method provided by the invention does not have thick middle part and two thin side parts.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a rolling method for pole pieces of lithium-ion batteries. Background technique [0002] With the development of modern society, various mobile devices, such as camcorders, notebook computers, portable DVDs and digital cameras, are used more and more widely, and the demand for high-energy batteries for these mobile devices is also increasing. Lithium-ion batteries are gradually favored by people because of their outstanding advantages such as light weight, large energy storage, high power, no pollution, long life, small self-discharge coefficient and wide temperature range, and become the best power supply for mobile devices. Even in the fields of aviation, aerospace, navigation, automobiles and medical equipment, it has gradually replaced other traditional batteries. [0003] Lithium-ion batteries generally include several battery cells stacked in sequ...

Claims

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Application Information

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IPC IPC(8): B21H7/00
Inventor 周中心姚植森罗志高贾宝安
Owner DONGGUAN AMPEREX TECH