Apparatus for pinhole detection and process for improving...

Details Apparatus for pinhole detection and process for improving... Apparatus for pinhole detection and process for improving...

G - Physics

01

M

G01M 3/26 (2006.01) G01M 3/12 (2006.01) H01M 10/28 (2006.01) H01M 10/42 (2006.01) H01M 2/16 (2006.01)

Patent

CA 2103733

APPARATUS FOR PINHOLE DETECTION AND PROCESS FOR IMPROVING YIELD IN THE MANUFACTURE OF BATTERIES ABSTRACT This invention pertains to microporous plastic films and to methods of inspecting such films. A signifi- cant number of rechargeable lithium batteries can be defective as fabricated and must be rejected. Flaws in the microporous polyolefin film separator, consisting of pinholes ?10 µm in size, can be a cause for many defective cells. A novel apparatus and process is disclosed to detect the rare occurrence of pinholes over large areas in microporous polyolefin film separators used in rechargeable lithium batteries to improve battery yield.

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