Soldering method of nonaqueous-electrolyte secondary-battery

Details Soldering method of nonaqueous-electrolyte secondary-battery Soldering method of nonaqueous-electrolyte secondary-battery

2008-07-15

2008-07-15

Lorengo, Jerry A. (Department: 1793)

Metal working

Method of mechanical manufacture

Electrical device making

C029S623200, C029S623300, C029S623400, C029S623500, C228S183000, C320S161000, C320S135000, C320S136000

Reexamination Certificate

active

07399321

ABSTRACT:
In a method of reflow soldering, a non-aqueous electrolyte secondary battery is discharged to a first discharge voltage different from a second discharge voltage at an inflection point in a discharge curve of the non-aqueous electrolyte secondary battery having an axis of abscissa representing discharge capacity and an axis of ordinate representing discharge voltage. The discharged non-aqueous electrolyte secondary battery is placed on a substrate which is then exposed to a reflow soldering temperature to reflow solder the non-aqueous secondary battery to the substrate. The first discharge voltage is higher than the second discharge voltage to prevent degradation of characteristics of the non-aqueous electrolyte secondary battery resulting from decomposition of the non-aqueous electrolyte due to reaction of the non-aqueous electrolyte with excessive lithium ions in the cathode active material when the non-aqueous electrolyte secondary battery is exposed to the reflow soldering temperature.

REFERENCES:
patent: 6377030 (2002-04-01), Asao et al.
patent: 6818735 (2004-11-01), Yoshimura et al.

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