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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: 2005-07-06
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Embodiment 1

[0017] Reference attached figure 1 , The single-piece preparation method of the segmented rolling electrode, the electrode is first cut into single-segment electrodes, and the pieces are separately renewed. After the conventional rolling electrodes reach the normal density, it becomes the primary rolling electrode part 1, which has the function of inching roll lifting or On a rolling mill with a reversal function and a diameter greater than 300mm, calculate the time for the primary rolling electrode based on the roll speed and the length of the single-stage electrode, and perform another rolling to become the secondary rolling electrode part 2. The initial part of the primary rolled electrode part 1 is no longer rolled, and the rolled electrode is taken out to become a segmented rolled electrode.

Embodiment 2

[0019] Reference attached figure 1 , The continuous preparation method of the segmented rolling electrode selects the diameter of more than 300mm, and the gap between the two rolls is continuously adjustable from 0-2mm. First, the electrode is rolled to a normal density according to the normal rolling process to become the primary rolling electrode part 1. The programming controller automatically controls the lifting stroke, roll speed, rolling length and rolling time of the two rolls of the rolling mill, and rolls the electrode once again to become continuous, and the electrode needs to be rolled once every 50mm. A section of the length of the secondary rolling electrode part 2 is a continuous sectioned rolling electrode, and the primary rolling electrode 1 part of the continuous sectioned rolling electrode is cut to become a sectioned 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 particularly relates to a method for preparing a segmented rolling electrode. Background technique [0002] At present, the rolling density of the electrode determines the final amount of active material that can be loaded in the limited shell, which can be used as a way to increase the battery capacity. Traditional battery pole piece preparation is to place the entire pole piece in a rolling mill for uniform speed rolling. When the rolling density is low and the same length, the wound electrode is difficult to put into the battery shell, or can be put Into the battery case, the capacity is very low; when the rolling density is high, the mechanical strength of the electrode becomes worse. During the initial winding, due to the large curvature, it is easy to break, which limits the application of this approach. Summary of the invention [0003] In order to solve the problems ...

Claims

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Application Information

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Patent Type & Authority Applications(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