| 摘要 |
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. |
