Slotted insulator for unsealed electrode edges in electrochemica

Details Slotted insulator for unsealed electrode edges in electrochemica Slotted insulator for unsealed electrode edges in electrochemica

1998-03-06

2000-01-11

Kalafut, Stephen

Metal working

Method of mechanical manufacture

Electrical device making

429 94, 429211, H01M 226

Patent

active

060131136

ABSTRACT:
In fabrication of conventional spirally wound cells, a length of separator is provided at least twice as long as one of the electrodes, for example, the cathode, and then folded to cover both sides of the electrode. The separator is also somewhat wider than the covered electrode to extend beyond the upper and lower edges thereof. The cathode assembly is then placed along side a strip of anode material and rolled into a jellyroll configuration. The separator sheet is not sealed at the opposed upper and lower edges of the cathode, and during high shock and vibration conditions the edges tend to mushroom which can lead to short circuit conditions. The insulator of the present invention is a slotted member that covers the upper and lower edges of the other electrode not covered by the separator, for example the anode with the anode leads extending through the slots to shield them from short circuit conditions with the cell casing or other leads if the cell should be subjected to severe shock forces and the like.

REFERENCES:
patent: 2157629 (1939-05-01), Rolph
patent: 2954417 (1960-09-01), Lehovec et al.
patent: 4049882 (1977-09-01), Beatty
patent: 4327163 (1982-04-01), Wheadon
patent: 4604333 (1986-08-01), Ikeda et al.
patent: 5116698 (1992-05-01), Sears
patent: 5486215 (1996-01-01), Kelm et al.
patent: 5631102 (1997-05-01), Spillman et al.
patent: 5853914 (1998-12-01), Kawakami

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