LITHIUM ION SECONDARY BATTERY

摘要

A lithium ion secondary battery is provided that suppresses an increase of an internal pressure of a battery caused by gases generated therein so as to suppress battery swelling which is linked to a variation of a thickness of the battery and an increase of a binding force of the battery, and is trouble-free in manufacturing as an on-vehicle battery module, so that a high reliability is provided. The lithium ion secondary battery includes a clathrate compound in a battery container, and the clathrate compound is one or more types of compounds selected from a group consisting of cyclodextrins, calixarenes, and crown ethers. With this configuration, CO gas, CO2 gas, and H2 gas in the battery container are absorbed, and the battery swelling caused by the gases is suppressed.

主权项

1. A lithium ion secondary battery comprising:
a wound electrode group in which an anode and a cathode are disposed with a separator interposed therebetween; a battery container that stores the wound electrode group; a lid that seals the battery container; and a nonaqueous liquid electrolyte that is injected into the battery container, wherein a clathrate compound is contained in the battery container, and the clathrate compound is one or more types of compounds selected from a group consisting of cyclodextrins, calixarenes, and crown ethers, and wherein the clathrate compound is contained in an insulating member that is disposed in the battery container.