Nonaqueous secondary battery

Details Nonaqueous secondary battery Nonaqueous secondary battery

2006-08-25

2010-06-01

Weiner, Laura S (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

C429S233000, C429S232000, C429S247000, C429S231100, C429S231800, C429S231300, C429S218100, C429S231950, C429S094000

Reexamination Certificate

active

07727674

ABSTRACT:
A nonaqueous secondary battery10of the invention has an active material compound layer14deposed over at least one face of a collector12made of metal foil and is equipped with a positive electrode11having a portion13in a part of which metal is exposed. The positive electrode11together with the exposed-metal portion13faces a negative electrode17through an interposed separator23, and on that part of the exposed-metal portion13that faces the negative electrode17through the interposed separator23there is formed a protective layer16made of a material whose electronic conductivity is lower than that of the metal and which moreover is non-insulative. With such nonaqueous secondary battery10, should part of an electrode pierce the separator and contact with the other electrode, the battery will be gently discharged, thereby averting abnormal heat generation by the battery and additionally enabling the battery's abnormality to be sensed by the equipment via the fall in battery voltage. Thus, there is provided a nonaqueous secondary battery of excellent safety that can prevent abnormal heat generation due to a short circuit caused by burr, powder or the like piercing the separator.

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