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Method of manufacturing square flat secondary battery

一种方形扁平、二次电池的技术，应用在二次电池制造、二次电池、小型扁平电池/电池等方向，能够解决体积膨胀或收缩的程度大、耐压强度小、包装罐电极组内部压力等问题，达到容量大、抑制内部电阻的增大的效果

Inactive Publication Date: 2009-01-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if the charge-discharge cycle of the battery is repeated, the packaging can is subject to internal pressure due to swelling of the electrode group, etc.
In the case of a cylindrical battery, the entire side of the can is subjected to internal pressure uniformly, while in the case of a prismatic flat battery, since the side of the can with longer sides has a lower compressive strength, the The problem described: The side with the longer side in the can will cause expansion
[0011] Since the theoretical capacity of an active material made of a compound such as silicon is larger than that of a carbon material such as graphite, the active material is suitable for increasing the capacity of the battery, but the volume of the active material expands with charge and discharge. or a large degree of shrinkage

Method used

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  • Method of manufacturing square flat secondary battery
  • Method of manufacturing square flat secondary battery
  • Method of manufacturing square flat secondary battery

Examples

Experimental program
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no. 1 example

[0044] (a) Making the positive plate

[0045] A positive electrode mixture consisting of lithium cobalt oxide (Lithium cobalt oxide) as an active material, PVDF as a binder, and acetylene black as a conductive agent is coated on an aluminum foil as a current collector and dried, and then passed through a roller After the rolling, it was cut into a width of 29.5 mm to obtain a positive electrode plate hoop.

[0046] (b) Making the negative plate

[0047] A negative electrode mixture composed of artificial graphite as an active material, SBR as a binder, and carboxymethyl cellulose as a thickener is coated on a copper foil as a current collector and dried, and then rolled by a roller Thereafter, it was cut into a width of 30.6 mm to obtain a negative electrode plate strip.

[0048] (c) Preparation of electrolyte

[0049] There will be 1M (molar concentration) of LiPF 6 Dissolved in a non-aqueous mixed solvent (volume ratio 3:5:2) composed of ethylene carbonate, ethyl methyl ...

no. 2 example

[0056] A lithium ion secondary battery was fabricated in the same manner as in the first embodiment except for the following parts, the difference being that the material of the core member 2 was changed to polypropylene (Pylar) as compared to the first embodiment. The modulus is 4.5GPa).

no. 3 example

[0058] A lithium ion secondary battery was manufactured in the same manner as the first embodiment except for the following parts, the difference being that the material of the core member 2 was changed to PVDF (Young's The modulus is 2.0×10 -3 GPa), and the core member 2 was set to have the same dimensions as those of the first embodiment (30 mm in longitudinal length, 26.4 mm in transverse length, and 0.3 mm in thickness) and a plate shape.

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Abstract

A method of manufacturing a square flat secondary battery comprises the steps of forming a circular or elliptical electrode group (3) by winding a positive pole plate and a negative pole plate with a separator interposed therebetween, inserting a core member (2) imparting a pressing force to the electrode group (3) into the core hole (6) of the electrode group (3), compressing the electrode group (3) to deform the electrode group (3) in a flat shape, and then, storing the flat electrode group (3) in a square flat type bottomed external container (4) and sealing the opening of the external container (4).

Description

technical field [0001] The present invention relates to a method for manufacturing a prismatic flat secondary battery with excellent stability in battery characteristics and high capacity. Background technique [0002] In recent years, the portability and wirelessization of consumer electronic devices are progressing. With the miniaturization and weight reduction of electronic equipment, non-aqueous electrolyte secondary batteries such as nickel-cadmium batteries, nickel-metal hydride batteries, or sealed small lead storage batteries have been used as power sources for driving these electronic equipment. In order to realize high-efficiency charge and discharge, in non-aqueous electrolyte secondary batteries, generally, a positive electrode plate and a negative electrode plate are rolled up with a separator sandwiched therebetween to form an electrode group. [0003] With the miniaturization and weight reduction of electronic equipment, from the viewpoint of effectively util...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/02H01M4/38H01M4/48H01M10/0566H01M10/0587H01M50/147
CPCH01M10/0413H01M4/661H01M10/0468H01M4/602H01M2/0404H01M2/0217H01M10/0431H01M10/0436Y10T29/4911Y02E60/10H01M50/103H01M50/147Y02P70/50H01M10/0587H01M4/38H01M10/38
Inventor 平川靖白根隆行
Owner PANASONIC CORP