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Method for producing a secondary cell having flat wound electrode body

A technology of spiral electrodes and secondary batteries, which is applied in secondary battery manufacturing, electrode manufacturing, secondary batteries, etc., can solve the problems of deterioration of battery characteristics such as cycle characteristics, failure to increase winding speed, and reduction of winding quality, etc., to achieve Suppression of cycle deterioration, suppression of battery thickness increase, and excellent productivity

Active Publication Date: 2006-07-26
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems in that the winding speed cannot be increased because the shape of the core is flat, and the quality of the winding is lowered due to the lowered tension, and the productivity is deteriorated.
However, this technology also suffers from the problem of deteriorating battery characteristics such as cycle characteristics, as in the technology described in Patent Document 2 above.

Method used

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  • Method for producing a secondary cell having flat wound electrode body
  • Method for producing a secondary cell having flat wound electrode body
  • Method for producing a secondary cell having flat wound electrode body

Examples

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Embodiment 1

[0052]

[0053] Using a winding core with a circular cross-section, wind the positive electrode prepared by a known method, the negative electrode with the negative electrode sheet 2 installed, and the separator between the two, then fix the winding end by a tape (tape), remove the winding core, thereby producing a cylindrical electrode body 1 (16.5 mm in diameter). Such as figure 2 As shown, on the one hand, using a loosening processing device 10 having two rotating rollers 11 arranged in parallel, the electrode body 1 is pushed into a rough ellipse with a minor diameter of 15.0 mm (about 91% of the original diameter) in cross section. On the other hand, the electrode body 1 is rotated (loosening process) in the same direction as the winding direction. at this time, image 3 The movement distance (looseness) of the negative electrode sheet 2 shown in is 6.2 mm.

[0054] Thereafter, after pressing in a direction perpendicular to the width direction of the negative electr...

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Abstract

Disclosed is a manufacturing method for a secondary battery with a flat helical electrode body. The invention is characterized in that the manufacture method has a first working procedure including that an anode, a cathode and a separator between the two electrode plates are wound by a winding core and the winding ends are fixed, and then an approximately cylindrical electrode body is manufactured; a second working procedure including that after the first working procedure, the approximately cylindrical electrode body is pushed and pressed along the direction vertical to the winding axis to be deformed with an approximately oblong section on one hand, and the deformed electrode body is rotated along the same direction as the winding direction to loosen the wound state on the other hand; and a third working procedure including that after the second working procedure, the electrode body is pressed to become a flat helical electrode body. Accordingly, the electrode plate curving caused by charge and discharge and the phenomena of battery expansion and recycle deterioration can be restrained.

Description

technical field [0001] The present invention relates to a method for manufacturing a secondary battery having a flat spiral electrode body that suppresses bending of the electrode plate caused by charge and discharge, battery expansion and cycle deterioration. Background technique [0002] In recent years, the miniaturization and weight reduction of mobile information terminals such as mobile phones, notebook computers, and PDAs has been rapidly progressing, and secondary batteries are required to be easily installed inside these devices and output large currents easily. [0003] For this reason, a non-aqueous electrolyte secondary battery in which the opposite area of ​​the positive and negative electrodes is large and the flat spiral electrode body that is easy to output a large current is accommodated in a square casing and a layered (laminate) outer packaging that is easy to be installed inside the above-mentioned machine, Widely used for the above purposes. [0004] In...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M10/04H01M4/04H01M10/0587
CPCY02E60/12Y02E60/122Y02E60/10Y02P70/50H01M10/0431H01M10/0587
Inventor 山内康弘山中友和
Owner SANYO ELECTRIC CO LTD
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