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A preparation method of high-precision rolled copper foil for lithium batteries

A rolled copper foil, high-precision technology, applied in elongation control, driving device for metal rolling mill, metal rolling, etc. The effect of preventing oxidative discoloration, improving corrosion resistance, optimizing process steps and process parameters

Active Publication Date: 2017-12-22
中色正锐(山东)铜业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the rolled copper foil used in lithium batteries has poor bending resistance after being rolled and formed, and is easy to break for a long time, which is far from meeting the bending resistance requirements of rolled copper foil for lithium batteries (bending resistance is greater than 600 times); and the rolled copper foil aimed at lithium batteries is not subjected to surface treatment after rolling and forming, but is directly applied to lithium batteries. Since it is a smooth rolled copper foil, the surface properties are unstable, especially easy to be exposed to air. , moisture and high temperature oxidation discoloration, easy to be corroded, which seriously affects the performance of rolled copper foil; the above two reasons seriously limit the extensive application of rolled copper foil in lithium batteries

Method used

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preparation example Construction

[0033] The invention provides a preparation method of high-precision rolled copper foil for lithium batteries, comprising the following steps:

[0034] 1) Preparation of copper foil base material: the copper is smelted and processed into an ingot, and then subjected to hot rolling, rough rolling and finish rolling to obtain a 0.15mm copper foil base material;

[0035] 2) Copper foil rolling mill rolling: it is divided into 5 rolling passes in total;

[0036] The reduction rate in the first pass is 50% to 53%, the total inlet tension is 4000N to 4200N, the total outlet tension is 5000N to 5100N, the rolling speed is 740m / min to 760m / min, and the rolling force is 440N~460N, the bending force is 1~3Mpa;

[0037] The reduction rate in the second pass is 42% to 44%, the total tension on the entry side is 2800N to 3000N, the total tension on the exit side is 2900N to 3100N, the rolling speed is 740m / min to 760m / min, and the rolling force is 440N~460N, the bending force is 1~3Mpa; ...

Embodiment 1

[0058] A method for preparing high-precision rolled copper foil for lithium batteries, comprising the following steps:

[0059] 1) Preparation of copper foil base material: the copper is smelted and processed into an ingot, and then subjected to hot rolling, rough rolling and finish rolling to obtain a 0.15mm copper foil base material;

[0060] 2) Copper foil rolling mill rolling: it is divided into 5 rolling passes in total;

[0061] In the first pass, the thickness of the entry side is 0.1500mm, the thickness of the exit side is 0.0720mm, the reduction rate is 52%, the total tension of the entry side is 4000N, the total tension of the exit side is 5000N, and the rolling speed is 750m / min. The braking force is 450N, and the bending force is 2Mpa;

[0062] In the second pass, the thickness of the entry side is 0.0720mm, the thickness of the exit side is 0.0412mm, the reduction rate is 42.8%, the total tension of the entry side is 2950N, the total tension of the exit side is 2...

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Abstract

The invention discloses a preparation method of a high-precision rolled copper foil for a lithium battery. The preparation method is characterized in that I, technological steps and technological parameters of rolling of a copper foil rolling machine are improved according to a copper foil rolling theory, a 0.15-mm copper foil parent material is prepared into a 0.0097-mm rolled copper foil through five passes of rolling, the rolled copper foil is tested through a bending resistance testing machine and resists 784 times of bending on average, and the bending resistance requirement (the bending resistance time is larger than 600) of the rolled copper foil for the lithium battery is met; and II, chromium plating and zinc plating surface treatment is added after rolling forming is carried out and before the rolled copper foil is applied to the lithium battery, and the technological steps and technological parameters of chromium plating and zinc plating are optimized, so that the rolled copper foil subjected to rolling forming is prevented from oxidizing and discoloring, the corrosion resistance is improved, and the rolled copper foil does not oxidize and discolor when the rolled copper foil is stored for a long time at the normal temperature and is placed at the high temperature of 180 DEG C for 30 minutes.

Description

technical field [0001] The invention relates to the technical field of rolled copper foil processing, in particular to a preparation method of high-precision rolled copper foil for lithium batteries. Background technique [0002] Rolled copper foil is made by smelting and processing copper into ingots, then hot-rolling, rough rolling and finishing rolling to make 0.1-0.15mm copper foil base material, and finally rolled repeatedly by copper foil rolling mill. . Therefore, the crystalline structure of rolled copper foil is a sheet structure, which is superior to electrolytic copper foil in terms of strength and toughness. [0003] High-precision rolled copper foil is mainly used as a current collector for the negative electrode of lithium batteries. Compared with electrolytic copper foil, the metallographic structure of rolled copper foil is composed of multi-layer flaky grains, while electrolytic copper foil is mostly composed of a layer of needle-shaped grains. The same th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/40B21B37/58B21B37/56B21B15/00B21B45/02C25D7/06C25D3/08C25D3/22
CPCB21B1/40B21B15/00B21B37/56B21B37/58B21B45/0272B21B2261/04B21B2265/02B21B2275/06C25D3/08C25D3/22C25D7/0614
Inventor 冯连朋姜业欣陈宾李学帅张玉翠王亚超张西军梁琦明
Owner 中色正锐(山东)铜业有限公司
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