method to group single cells of power sources to build optimal packs using parameters obtained by analysis of impedance spectrum

摘要

PURPOSE: Provided is a method for selecting batteries, forming a battery pack, by measuring and analyzing the impedance of the batteries to improve the performance property of the battery pack made by series, parallel, or their combination in primary or secondary batteries. CONSTITUTION: The method comprises the steps of: obtaining at least two parameters by an indirect and non-destructive test for grasping the inside performance property of an electrochemical power source, wherein the electrochemical power source is a primary battery, a fuel cell, or a secondary battery; obtaining the interrelation between the total of the parameters and the inside performance property of the power source; forming the battery pack by classifying the power sources having the similar inside properties into a group from the interrelation.