Coin-shaped lithium battery
AssigneeSony Corporation
InventorsMasatsugu Shioda, Koichi Miyoda
Life of this patent
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Abstract
A coin-shaped lithium battery is disclosed. The coin-shaped lithium battery comprises a battery can containing therein an anode pellet composed of lithium or lithium alloy and a cathode pellet which are arranged to face each other with a separator provided between the pellets. At least one of the anode pellet and the cathode pellet has its central part swollen to form a curved surface. The battery can is elastically deformed to be aligned with the curved surface. In the coin-shaped lithium battery, total height of the anode pellet and the cathode pellet in outer rim part is smaller than total height in central part by 4 to 12%.
Claims7
A coin-shaped lithium battery comprising:
- a battery can containing therein an anode pellet composed of lithium or lithium alloy and a cathode pellet which are arranged to face each other with a separator provided between the pellets, said separator having a substantially planar configuration prior to assembly;
- at least one of the anode pellet and the cathode pellet having its central part swollen to form a curved surface, each said curved surface being spherical or paraboloidal;
- and
- the battery can being deformed to be aligned with the curved surface, whereby a lithium battery whose internal resistance as measured after 80% discharge of nominal capacity of about 220 mAh is less than or equal to 28 .OMEGA. is provided.
Dependencies are inferred from the claim text.