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Method and device for inspecting secondary battery precursor and method for manufacturing secondary battery using the inspection method

  • US 7,239,147 B2
  • Filed: 08/14/2003
  • Issued: 07/03/2007
  • Est. Priority Date: 08/29/2002
  • Status: Active Grant
First Claim
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1. A method for manufacturing a secondary battery comprising:

  • making a secondary battery precursor including a pair of electrodes and a separator disposed between the pair of electrode ; and

    inspecting the secondary battery precursor,wherein the step of inspecting the secondary battery precursor comprises;

    applying a constant inspection voltage between the pair of electrodes before an electrolyte solution is injected between the pair of electrodes, and measuring a current flowing due to application of the inspection voltage at intervals of 1 ms or less; and

    determining the precursor to be defective if a current value exceeding a previously set reference current value is detected within a time period corresponding to a time period between an appearance of peak current due to an inrush current and obtaining of a constant current when a voltage is applied to a normal secondary battery precursor, the time period being within 60 milliseconds from starting of the application of the inspection voltage.

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