Battery electrode sheet and manufacturing method therefor

A manufacturing method and electrode sheet technology, applied in electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., can solve problems such as cracks, wrinkles, frequent manufacturing processes, etc., and achieve the effect of increasing manufacturing processes and high-speed manufacturing

Active Publication Date: 2015-06-24
GS YUASA INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the load on the coated part is large and the bending is large, wrinkles or cracks are likely to occur due to deformation of the electrode
Such a greatly bent electrode sheet requires frequent stoppage of the manufacturing process, manual correction of defects, etc.

Method used

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  • Battery electrode sheet and manufacturing method therefor
  • Battery electrode sheet and manufacturing method therefor
  • Battery electrode sheet and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0043] (First embodiment)-Electrode sheet for wound type battery-

[0044] figure 1 It is a figure which shows the structure of the electrode sheet for wound-type batteries of 1st Embodiment. As shown in this figure, the electrode sheet 30 is formed by rolling an active material layer P on the entire surface of an electrode sheet formed of a sheet-like metal foil except for at least one end edge portion. In addition, the uncoated portion U of the end edge portion is intermittently provided with an extended portion 24a having a substantially rectangular shape, for example, a substantially trapezoidal shape, in the longitudinal direction of the electrode sheet. The extending portion 24a is formed by, for example, a batch-type roll press machine described later, and is obtained by extending the metal foil by pressing. The uncoated portion U is provided along the rolling direction of the active material layer P.

[0045] The electrode sheet 30 only needs to have a sheet-like metal t...

no. 2 approach

[0057] (Second embodiment)-Manufacturing method of electrode sheet for wound type battery-

[0058] Next, an embodiment of the method of manufacturing the electrode sheet of the first embodiment will be described as an example.

[0059] Figure 5 Shows the approximate procedure for manufacturing electrode sheets for wound batteries. First, a paste-like active material layer is applied to an electrode sheet formed of a sheet-like metal foil (step S1). Then, the uncoated portion of the active material layer is formed on the electrode sheet approximately simultaneously with step S1 (step S2). In the third step, the unpainted portions are intermittently pressed to form rectangular extensions at approximately equal intervals (step S3). Finally, the active material layer is rolled (step S4). The above steps are the characteristics of the above manufacturing method.

[0060] It should be noted that step S1 and step S2 may be omitted, and an electrode sheet coated with a paste-like activ...

Embodiment

[0074] The diameter of each roll of the main roll press 22 and the intermittent roll press 21 is important because it determines the press line pressure. The inventors of the present invention conducted various experiments to investigate the relationship between press line pressure and bending amount.

[0075] Figure 7 It is a diagram for explaining an example of the method of measuring the amount of bending. In this measuring method, after the active material P is rolled, the electrode sheet 30 is cut to a predetermined size. In order to measure the amount of bending, in a state where one end (one side) of the electrode sheet 30 is fixed with the fixing tool 31, a weight of 850 g or the like is suspended on the other end (one side) side to apply a load. In this state, as shown in the figure, the metal gauge 32 is close to 1 m, and the bending amount is the largest in the center portion, and the bending amount is measured in the center portion.

[0076] In roll presses, generall...

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Abstract

Embodiments of the present invention provide such things as an electrode sheet having little curl for a spiral wound battery and a manufacturing method therefor. An electrode sheet is such that active material layer(s) is / are present and has / have been subjected to working by rolling at entire surface(s) thereof, except for at least one uncoated region U, of electrode sheet(s) comprising sheet(s) of metal foil(s) S. Moreover, drawn region(s) is / are provided at region(s) uncoated with active material layer(s) in such uncoated region(s) U. By thus creating drawn region(s) at uncoated region(s) of the electrode sheet, curling of the electrode sheet is suppressed, and furthermore, when tension is applied to carry out winding of the electrode sheet and / or convey the electrode sheet to subsequent operation(s), there is reduced likelihood of occurrence of wrinkling and / or tearing in the long direction of the electrode sheet.

Description

Technical field [0001] The present invention relates to an electrode sheet for a battery and a manufacturing method thereof. Background technique [0002] Picture 9 This is a diagram showing an example of the structure of a conventional wound battery (Patent Document 1). As shown in this figure, a wound type battery usually consists of a sheet-shaped positive electrode formed with a positive electrode active material (a positive electrode composite material layer 8), a separator 4, and a sheet formed with a negative electrode active material (a negative electrode composite material layer 10). Shaped negative structure. In addition, the uncoated portions (multilayer material layer uncoated portions 7, 9) in the edge portions of one of the negative electrode and the positive electrode are wound in a state of being overlapped so as to protrude from the separator in opposite directions, respectively. And is stored in the battery container. The “uncoated portion (uncoated portion 7...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/04H01M4/13H01M4/139
CPCH01M4/0435H01M4/661H01M4/667H01M4/668H01M4/70Y10T29/10Y02E60/10Y02P70/50
Inventor 冈部一弥大谷佳克高浦义博
Owner GS YUASA INT LTD
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