Lithium ion secondary cell

A secondary battery, lithium ion technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem of low probability of internal short circuit

Inactive Publication Date: 2008-02-06
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is already known that the probability of internal short circuit is not too high in the place recorded in JP-A-2004-63343

Method used

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Examples

Experimental program
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Embodiment approach 1

[0040] FIG. 1 shows a part of the winding end side of an electrode group used in a lithium ion secondary battery according to an embodiment of the present invention.

[0041] The electrode group in FIG. 1 has a strip-shaped positive electrode 11 , a strip-shaped negative electrode 12 , and a separator 13 arranged between the positive electrode and the negative electrode. In the electrode group of FIG. 1 , the positive electrode 11 is composed of a positive electrode current collector 11 a and positive electrode mixture layers 11 b carried on both surfaces thereof. The negative electrode 12 is composed of a negative electrode current collector 12a and negative electrode mixture layers 12b carried on both surfaces thereof. In addition, the positive electrode 11 and the negative electrode 12 are wound together by being separated by a separator. In addition, the exposed portion 15 of the positive electrode current collector in which the positive electrode mixture layer does not e...

Embodiment approach 2

[0071] 3a and 3b show a first side view and a second side view of a negative electrode used in a lithium ion secondary battery according to another embodiment of the present invention. In addition, FIG. 4 shows a vertical cross-sectional view of an electrode group fabricated using the negative electrodes shown in FIGS. 3a and 3b. Also in the present embodiment, the porous heat-resistant layer and the like are used as those in the first embodiment described above.

[0072] In the present embodiment, the belt-shaped positive electrode 21 is composed of a positive electrode current collector 21a and positive electrode mixture layers 21b carried on both surfaces thereof. The strip-shaped negative electrode 22 is composed of a negative electrode current collector 22a and negative electrode mixture layers 22b attached to both surfaces thereof. Here, along one long side of the positive electrode, the exposed portion 25 of the positive electrode current collector without the positive...

Embodiment approach 3

[0086] Fig. 5a shows a cross-sectional view of a positive electrode, a separator, and a negative electrode used in a lithium ion secondary battery according to another embodiment of the present invention. In addition, also in this embodiment, a porous heat-resistant layer etc. are the same as that of said Embodiment 1.

[0087] As shown in FIG. 5 a , the positive electrode 31 includes a positive electrode current collector 31 a and positive electrode mixture layers 31 b carried on both sides thereof. The negative electrode 32 includes a negative electrode current collector 32 a and negative electrode mixture layers 32 b carried on both surfaces thereof. Furthermore, a porous insulating layer 34 is provided on the upper surfaces of the mixture layers of the positive electrode 31 and the negative electrode 32 from the end on the winding start side to a predetermined position. As an example, FIG. 5b is a schematic view showing one side of the negative electrode, which is located...

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Abstract

The present invention provides a lithium ion secondary battery including: an electrode group including a belt-like positive electrode and a belt-like negative electrode that are wound with a separator interposed therebetween; and a can with a bottom for accommodating the electrode group, wherein the positive electrode has a positive electrode current collector and a positive electrode mixture layer carried on the positive electrode current collector, the negative electrode has a negative electrode current collector and a negative electrode mixture layer carried on the negative electrode current collector, and a porous heat-resistant layer is partially provided between the separator and at least one of the positive electrode mixture layer and the negative electrode mixture layer. Since a porous heat-resistant layer is thus placed, a high performance lithium ion secondary battery capable of efficiently preventing internal short circuit due to overheating while preventing decrease in battery characteristics can be provided.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery with high safety, and more specifically, to a lithium ion secondary battery capable of effectively maintaining battery characteristics. Background technique [0002] Lithium-ion secondary batteries can be used as main power sources for various portable devices because they are storage batteries with high energy density. A chemical battery such as a lithium ion secondary battery generally has a positive electrode, a negative electrode, and a separator arranged between the positive electrode and the negative electrode. The role of the separator is to electrically insulate the positive electrode and the negative electrode and to hold the electrolytic solution. [0003] In current lithium-ion secondary batteries, an electrode group in which a positive electrode and a negative electrode separated by a separator are wound is mainly used. Generally, the positive electrode used in such an elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/38H01M10/40H01M10/0525H01M10/0587
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 藤田秀明畑中刚林徹也长崎显福本友祐铃木刚平
Owner PANASONIC CORP
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