LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery in which heat generated inside the battery is efficiently transmitted to a battery can and deterioration of battery characteristics due to temperature is prevented, without changing drastically the structure of the battery.

SOLUTION: The lithium ion secondary battery of wound-around type has a wound body formed by inserting it into the battery can, wherein the wound body is configured such that a positive electrode plate in which lithium ion can enter and leave and a negative electrode plate in which lithium ion can enter and leave are wound in swirl-shape through a porous separator separating these electrically. A heat sink is installed so as to contact the battery can inside the battery can.

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