Patent ID: 8102152
Filing Date: 2012-01-24
Classification: G01R,H01M,Y02E

Abstract:
1. A deterioration detecting method for a rechargeable lithium battery, the rechargeable lithium battery comprising: a positive electrode having a positive active material that absorbs and emits a lithium ion; a negative electrode having a negative active material that contains at least one of elements of silicon and tin; and an electrolyte having lithium-ion conductivity, the electrolyte being provided between the positive electrode and the negative electrode; the deterioration detecting method comprising: detecting a group of a closed-circuit charge cutoff voltage and an open-circuit voltage after charging of the rechargeable lithium battery; calculating an evaluation value based on the detected group of voltages; comparing the evaluation value and a reference value stored in advance to have a comparison result; and estimating a deterioration level of the rechargeable lithium battery based on the comparison result, wherein the evaluation value is an apparent resistance R where ΔV I