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Battery

A battery and electrode technology, applied in secondary batteries, lithium batteries, primary batteries, etc., can solve problems such as battery characteristics decline, and achieve the effect of preventing significant decline, preventing the expansion of short-circuit range, and preventing battery characteristics

Inactive Publication Date: 2005-02-16
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the scope of the short circuit expands, in a short period of time, the battery voltage sometimes drops significantly beyond the range of the battery's operating voltage, or sometimes the battery temperature rises, causing the battery characteristics to drop significantly.

Method used

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Examples

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Embodiment Construction

[0009] figure 1 It is a schematic plan view of the lithium ion secondary battery of embodiment of this invention. The positive electrode plate 1 and the negative electrode plate 3 are in the form of films, and are formed by coating a binder containing an active material on a metal foil serving as a current collector. The positive plate 1 is opposite to the negative plate 3 through the separation layer 2, and the gaps and spaces between the positive plate 1 and the negative plate 3 are filled with electrolyte. That is, the positive plate 1 is the first electrode, the negative plate 3 is the second electrode opposite to the first electrode and has a different polarity from the first electrode, and the separator 2 is arranged between the first electrode and the second electrode. These were all placed in an Aluminum Laminate Pack (not shown) and sealed. On the positive electrode plate 1 and the negative electrode plate 3 , lead wires 4 are bonded to the exposed portions of the r...

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Abstract

A battery has an electrode with a mixture layer including electroactive material formed on a current collector whose exposed part is welded to a lead, and also a separator that shrinks with heat. In the battery, a heat shrinkage-preventing layer is provided on a portion of the separator that faces the lead. As a result, even if a minor short-circuit occurs and a large amount of current is flown to a minor short-circuit region, the heat shrinkage-preventing layer prevents expansion of a short-circuit area resulting from heat shrinkage of the separator. Thus, a conspicuous decrease in battery properties is prevented.

Description

technical field [0001] The present invention relates to a battery comprising an electrode in which a binder layer is formed on a current collector to which a lead is bonded to an exposed portion, and a separator that shrinks due to heat. Background technique [0002] A battery requiring high output has an electrode composed of a current collector made of metal foil, an adhesive layer formed on the current collector and containing an active material, and a wire bonded to the exposed portion of the metal foil of the current collector. constitute. Such electrodes are wound facing each other via a separator that shrinks due to heat. In such a battery, internal short circuits are concentrated and easily generated at a wire bonding portion where a current collector and a wire are joined by welding or the like. [0003] One of the causes is cutting of the wire, burrs generated on the cut surface during processing, and unevenness generated during wire welding (hereinafter referred...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/64H01M6/00H01M10/04H01M10/052H01M10/42H01M50/105H01M50/403H01M50/417H01M50/449H01M50/474H01M50/48H01M50/489H01M50/491H01M50/528
CPCH01M10/4235H01M2/0207H01M2/1653H01M10/052H01M2/1686Y10T29/49114Y02E60/10H01M50/449Y02P70/50H01M50/417H01M50/105H01M50/491H01M50/489
Inventor 木宫宏和笠松真治西野肇岡村一広嵨田幹也
Owner PANASONIC CORP