Patent ID: 8984943
Filing Date: 2015-03-24
Classification: G01N

Abstract:
1. An inspection apparatus for a lithium ion secondary battery in which an electrolyte and an electrode group are disposed in a container, the electrode group including a positive electrode, a negative electrode, and a separator, the inspection apparatus comprising: a charge-discharge power supply for providing a plurality of charge and discharge currents to the lithium ion secondary battery; an AE sensor for detecting an acoustic emission generated in the container when charge current or discharge current is provided between the positive electrode and the negative electrode; and an AE analysis device for judging a state of the lithium ion secondary battery based on an amplitude intensity of the acoustic emission detected by the AE sensor; wherein the AE analysis device conducts a linear approximation for a value of the charge current or a value of the discharge current and the amplitude intensity of the acoustic emission, and estimates a number of charge-discharge cycles that have been provided to the lithium ion secondary battery.