Method for estimating of battery's state by measuring battery impedence and battery management apparatus

• Main Author: CHOI CHANG YOUL
• Format: Patent
• Language: Chinese; English
• Published: 04.06.2014
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TESTING

The disclosure relates to a method for estimating of battery's state by measuring battery impedence and a battery management apparatus using same; the method for estimating of battery's state by measuring the battery impedence comprises the following steps: at least sensing voltage, current and temperature of at least one cell of a cell pack formed by the cells; measuring a charging state or impedence of the cell according to the sensed information; extracting reference impedence of the cell from a lookup table according to at least one index from a group formed by frequency, temperature and charging state; comparing the reference impedence with the measured impedence, thereby deciding the cell state. When the cell impedence is calculated, the temperature and charging state are taken into consideration, so the cell impedence can compensate the changes along with the temperature and charging state; degradation of the cell can be informed to a user as a warning, thereby preventing impedence abnormal increasing