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Manufacturing method for secondary battery and device for detecting secondary battery precursor

A technology of secondary battery and manufacturing method, applied in the direction of secondary battery manufacturing, secondary battery charging/discharging, secondary battery, etc., capable of solving problems such as not being suitable for secondary batteries

Inactive Publication Date: 2008-02-13
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inspection method disclosed in JP-2000-195565A itself is not suitable for application to this secondary battery

Method used

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  • Manufacturing method for secondary battery and device for detecting secondary battery precursor
  • Manufacturing method for secondary battery and device for detecting secondary battery precursor
  • Manufacturing method for secondary battery and device for detecting secondary battery precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In Embodiment 1, the inspection method and inspection apparatus of the present invention will be described.

[0044] If foreign matter occurs between the electrodes, or the separator is defective, the insulating distance between the positive and negative electrodes is considerably reduced. In this case, when the electrode body is charged, a discharge phenomenon (surface discharge) may occur in a direction parallel to the surface of the separator as a porous material. By using the inspection method of the present invention, it is possible to detect the current generated due to such surface discharge. Such surface discharges can be detected even if the distance between the positive and negative electrodes is very short. The surface discharge phenomenon includes a partial discharge phenomenon locally caused by the separator, and an arc discharge phenomenon caused between the positive electrode and the negative electrode.

[0045] Hereinafter, the inspection method of the...

Embodiment 2

[0078] In Embodiment 2, an exemplary method of manufacturing a secondary battery of the present invention is described.

[0079] The secondary battery to be produced in the present invention is, for example, a nickel metal hydride battery, a lithium ion secondary battery, and the like. Among them, a lithium ion secondary battery having a thin separator (for example, 25 μm or less) is particularly suitable.

[0080] The manufacturing method of the present invention is characterized in that the secondary battery precursor is inspected by the inspection method of the present invention before it is brought into contact with the electrolyte solution. The rest of the manufacturing process can be realized by well-known manufacturing methods. In addition, the composition of the battery can be formed using well-known compositions. Hereinafter, an exemplary manufacture of a lithium ion secondary battery will be described.

[0081] First, a secondary battery precursor including a pair...

example

[0089] Hereinafter, the present invention will be described in more detail through an example. However, the present invention is not limited to the examples described below.

[0090] First, an electrode body (secondary battery precursor) for a secondary battery was produced. The positive electrode plate 51 was produced by applying a paste containing lithium cobalt oxide (main component) and acetylene black to both sides of an aluminum foil. At this time, a current collecting wire was welded on a part of the aluminum foil without applying paste thereto. The negative electrode plate 52 is produced by applying a paste containing graphite as a main component to both sides of copper foil. At this time, a current collecting wire was soldered on a part of the copper foil without applying paste thereto.

[0091]The positive electrode plate 51 and the negative electrode plate 52 are stacked and wound while interposing a separator 53 therebetween, whereby the electrode body is obtain...

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Abstract

(57) Abstract: A method for testing a precursor of a secondary cell with high reliability and high efficiency to judge the precursor to be acceptable or defective. The current flowing when a test voltage is applied between a pair of electrodes is measured before an electrolyte is placed between the electrodes. If a current the current value of which exceeds a predetermined reference current value (13) is detected during the time from the start of application of a voltage to a normal secondary cell precursor until the current becomes constant, the precursor is determined to be defective.

Description

[0001] The present invention is a divisional application of the following application, and the original application information is as follows: [0002] Application date: August 14, 2003 [0003] Application number: 03820705.2 [0004] Title of invention: Method and device for testing secondary battery precursor and method for manufacturing secondary battery using the testing method technical field [0005] The present invention relates to a method and device for inspecting a precursor of a secondary battery, and further relates to a method of manufacturing a secondary battery. In particular, the present invention relates to a non-destructive inspection of a secondary battery precursor for detecting insufficient insulation between electrodes, for example, from a plurality of secondary battery precursors produced. Background technique [0006] In the secondary battery manufacturing process, it is necessary to test products that have a short circuit between electrodes or prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M10/40G01R31/36G01N27/416H01M10/0525H01M10/36H01M10/42H01M10/44
CPCY02E60/12H01M10/0525H01M10/446H01M10/4285Y02E60/10Y02P70/50G01R31/36H01M10/0587
Inventor 久米俊郎庄司昌史井垣惠美子堤修司岛田干也棚桥正和高桥章今宿升一
Owner PANASONIC CORP
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