Cylindrical lithium ion secondary battery
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United States of America Patent
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N/A
Issued Date -
Mar 3, 2005
app pub date -
Aug 26, 2004
filing date -
Sep 1, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A type of cylindrical lithium ion secondary battery is disclosed, having a positive electrode, a negative electrode, and a separator forming a cylindrically-shaped electrode group, and along with electrolyte encased in a battery case and sealed with a battery cover. The battery positive electrode is formed by having active material smeared on an aluminum foil body; and the negative electrode is formed by having active material smeared on a copper foil body. One of the positive electrode or negative electrode being a belt-shaped electrode, and the corresponding electrode is formed by at least two pieces of smaller electrodes. The smaller electrodes are separated and non-conductive from each other. Each of the positive and negative electrodes has a conducting strip for the conduction of electrical currents, where the conducting strips connect to the battery cover or the battery case. When an internal short-circuit occurs within a certain area of the battery, the voltage remains the same and the battery can still be used safely and reliably.
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