Lithium ion secondary cell

A secondary battery and lithium-ion technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem that the probability of internal short circuit is not too high
CN1728439AInactive Publication Date: 2006-02-01PANASONIC CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
PANASONIC CORP
Publication Date
2006-02-01
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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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