Device for estimating a lifetime of a secondary battery and method thereof

摘要

Embodiments of the present invention provide an accelerated lifetime estimation device for predicting the lifetime of a secondary battery, and a method thereof. The accelerated lifetime estimation device can accurately estimate a normal lifetime of the secondary battery while reducing an evaluation time period of the secondary battery.

主权项

1. A device for estimating a lifetime of a battery to evaluate a battery design of the battery in an accelerated amount of time, the device comprising:
a battery evaluation device configured to charge and discharge the battery and to measure first battery life test data and second battery life test data from the battery; an input unit configured to receive the first battery life test data and the second battery life test data of the battery from the battery evaluation device, the first battery life test data and the second battery life test data corresponding to different conditions in the accelerated amount of time; and a processor operatively coupled with the input unit, the processor being configured to determine one or more parameters from the first battery life test data and the second battery life test data, calculate an acceleration factor (AF) correlating the first battery life test data and the second battery life test data in accordance with performing one or more mathematical operations on the one or more parameters, and predict an estimated lifetime of the battery in accordance with the AF and the second battery life test data to evaluate the battery design, wherein the processor comprises:
a parameter extractor configured to extract the one or more parameters from the first battery life test data and the second battery life test data;an acceleration factor calculator configured to calculate the AF in accordance with the one or more parameters; anda prediction unit configured to predict the estimated lifetime of the battery in accordance with the AF, and wherein the acceleration factor calculator is configured to calculate the AF by using an equation associated with a semi-empirical lifetime model that is defined asA⁢⁢F=t⁡(normal)t⁡(accelerated)=C-rate⁡(a)C-rate⁡(n)×Swing⁡(n)Swing⁡(a)×(Aa⁡(C-rate⁡(a),Swing⁡(a))An⁡(C-rate⁡(n),Swing⁡(n)))2,⁢ where t(normal) is a normal lifetime test time period for a first battery lifetime test for obtaining the first battery life test data, t(accelerated) is an accelerated lifetime test time period for a second battery lifetime test for obtaining the second battery life test data, C-rate(n) is a charge and/or discharge current used in the first battery lifetime test, C-rate(a) is a charge and/or discharge current used in the second battery lifetime test, Swing(n) is a charge and/or discharge cut-off voltage used in the first battery lifetime test, Swing(a) is a charge and/or discharge cut-off voltage used in the second battery lifetime test, and An is a slope parameter depending on the charge and/or discharge current and the charge and/or discharge cut-off voltage at the normal lifetime test time and Aa is a slope parameter depending on the charge and/or discharge current and the charge and/or discharge cut-off voltage at the accelerated lifetime test time, from among the one or more parameters, wherein the first battery life test data are obtained by charging and/or discharging a first battery with a first current, and the second battery life test data are obtained by charging and/or discharging a second battery with a second current greater than the first current.