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Method for preparing sectionally rolled electrode

An electrode and rolling technology, which is applied in the field of preparation of segmented rolling electrodes, can solve the problems of poor mechanical strength of electrodes, difficulty in putting electrodes into battery shells, and easy breakage, etc., to achieve increased capacity and simple process operation , low-cost effect

Inactive Publication Date: 2006-09-20
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional preparation of battery pole pieces is to place the whole pole piece in a rolling mill for uniform speed rolling. When the rolling density is small and the same length in this method, the coiled electrodes are difficult to put into the battery case, or can be placed Into the battery case, the capacity is very low; when the compaction density is high, the mechanical strength of the electrode becomes poor, and it is easy to break due to the large curvature during the initial winding, which limits the application of this approach

Method used

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  • Method for preparing sectionally rolled electrode

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Effect test

Embodiment 1

[0017] Refer to attached figure 1 , the monolithic preparation method of the segmented rolling electrode, the electrode is first cut into a single segment electrode, and the sheet is continued separately, and the conventional rolling electrode reaches a normal density, and becomes a rolling electrode part 1, which has the function of jogging the roll or On a rolling mill with a reverse function and a diameter greater than 300mm, calculate the time for the primary rolling electrode according to the roll speed and the length of a single electrode, and perform another rolling to become the secondary rolling electrode part 2. The initial part of the once-rolled electrode part 1 is no longer rolled, and the rolled electrode is taken out to become a segmented rolled electrode.

Embodiment 2

[0019] Refer to attached figure 1 , the continuous preparation method of the segmented rolling electrode, the diameter is greater than 300mm, and the gap between the two rolls is 0-2mm is continuously adjustable. Firstly, the electrode is rolled to the ordinary density according to the normal rolling process to form a rolling electrode part 1, which can be obtained by using a computer. The programming controller can automatically control the lifting stroke, roll speed, rolling length and rolling time of the two rolls of the rolling mill, and roll the once-rolled electrode again to become a continuous rolling electrode every 50mm. A section of the length of the secondary rolling electrode part 2 is a continuous segmental rolling electrode, and a part of the primary rolling electrode 1 of the continuous segmental rolling electrode is cut to become a segmental rolling electrode.

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Abstract

This invention refers to a method for making sectional rolled electrode, which contains putting electrode between two rollers of rolling machine, making first whole length rolling, then putting the rolled electrode in again, making second partially rolling to obtain the sectional rolled electrode with raised mechanical strength and rolling density. Said invention has simple operation, low cost and reliable quality and can be used for preparation of lithium ion cell.

Description

technical field [0001] The invention belongs to the technical field of battery component preparation, and in particular relates to a method for preparing segmented rolling electrodes. Background technique [0002] At present, the compacted density of the electrode determines the amount of active material that can be loaded in the limited shell, which can be used as a way to increase the battery capacity. The traditional preparation of battery pole pieces is to place the whole pole piece in a rolling mill for uniform speed rolling. When the rolling density is small and the same length in this method, the coiled electrodes are difficult to put into the battery case, or can be placed Into the battery case, the capacity is very low; when the compaction density is high, the mechanical strength of the electrode becomes poor, and it is easy to break due to the large curvature during the initial winding, which limits the application of this approach. Contents of the invention [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04
CPCY02E60/10
Inventor 张遥王晓峰喻津汉吴滨成
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST