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Method of rolling electrode hoop

A technology of electrode strips and electrodes, which is applied in the manufacture of electrodes, battery electrodes, secondary batteries, etc., and can solve problems such as increased short-circuit failures and reduced insertion of electrolytic cells

Inactive Publication Date: 2009-09-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to form an electrode group by winding the electrode with the thinner compound coating layer as the outer side, it is necessary to wind the electrode group in the opposite direction to that of rolling after rolling. Therefore, the winding of the outermost periphery of the electrode group The final terminal will be warped outward, resulting in reduced insertion into the electrolytic cell and increased short-circuit failures.
[0007] This is also the same in the case of a laminated electrode group in which the electrodes are made into long strips and the positive and negative electrodes are alternately overlapped through the separator. Since the negative electrode arranged on the outermost side is warped to the outside of the electrode group, there is a tendency toward the electrolytic cell. The problem of the same reduction in the insertability of the

Method used

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  • Method of rolling electrode hoop
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  • Method of rolling electrode hoop

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] will be composed of the formula MmNi 3.55 co 0.75 mn 0.4 al 0.3 The shown hydrogen storage alloy was pulverized in water with a wet ball mill to obtain a hydrogen storage alloy powder with an average particle diameter of 30 μm. After immersing the hydrogen storage alloy powder in an alkaline aqueous solution for surface treatment, 10 kg of a carboxymethyl cellulose aqueous solution with a solid content ratio of 1.5% and 0.4 kg of Ketjen black were added to 100 kg of the hydrogen storage alloy powder and mixed. After kneading, 1.75 kg of an aqueous solution of styrene-butadiene copolymer rubber particles having a solid content ratio of 40% was added and stirred to prepare an electrode mixture paste.

[0027] The electrode mixture paste was applied to both sides of the core material 2 made of nickel-plated iron punching metal with a thickness of 60 μm, a width of 300 mm, a punching hole diameter of 1 mm, and a porosity of 40%, covering a width of 260 mm. Coating is ca...

Embodiment 2

[0031] Compared with Example 1, except that the thickness A of the electrode mixture layer 3a was set to 5 μm, and the thickness B of the electrode mixture layer 3b was set to 195 μm so that A / B=0.03, it was applied in the same manner as in Example 1. The electrode mixture paste is pasted and dried to make an electrode strip 1 . After the electrode strip was rolled in the same manner as in Example 1, the warpage height was measured in the same manner as in Example 1, and it was 1.3 mm.

Embodiment 3

[0033]Compared with Example 1, the thickness A of the electrode mixture layer 3a was set to 18 μm, and the thickness B of the electrode mixture layer 3b was set to 182 μm so that A / B=0.1, and the coating was carried out in the same manner as in Example 1. The electrode mixture paste is pasted and dried to make an electrode strip 1 . After rolling this electrode strip in the same manner as in Example 1, the height of warpage was measured in the same manner as in Example 1, and it was 0.7 mm.

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Abstract

The present invention provides a method for rolling an electrode strip. The electrode strip (1) provided with electrode mixture layers (3a, 3b) on both sides of a strip-shaped core material (2) made of metal sheets is rolled toward a pair of rolling rollers (8a, 8a, 3b). In the rolling process of feeding and rolling between 8b), when the average thickness of the electrode mixture layers (3a, 3b) of the electrode strip (1) is different on the front and back sides, the electrode mixture layer in the electrode strip (1) Let the side with the thinner average thickness be the a side and the other side be the b side. The electrode strip (1) is supplied so that the a side is wound around one of the rolls. Therefore, even if the electrodes on the front and back sides of the core material Even when the thickness of the mixture layer is different, a flat electrode strip after rolling can be obtained.

Description

technical field [0001] The present invention relates to a rolling method of an electrode strip provided with an electrode mixture layer on both sides of a core material made of a thin metal plate, and particularly relates to the realization of the rolled electrode strip under the condition that the thickness of the electrode mixture layer is different on the front and back sides. The deformation of the electrode strip is suppressed by the rolling method. Background technique [0002] Batteries such as alkaline storage batteries and lithium-ion secondary batteries are widely used as power sources for portable devices, electric tools, and electric vehicles. As a typical production method of the electrode, a method of filling a three-dimensional metal porous body with a powder material such as the positive electrode of an alkaline storage battery; A method in which an electrode mixture paste obtained by kneading powder materials is applied to a core material composed of a thin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/26H01M4/13H01M4/139
CPCY10T29/49112H01M4/0404H01M4/26Y02E60/124H01M10/0431H01M4/139Y02E60/122H01M10/0587Y02E60/10
Inventor 今村公洋臼井广幸南野圭史
Owner PANASONIC CORP