Cell voltage equalizer includes voltage detection ICs configured to measure output voltages from cells, respectively; discharge circuits (40) provided to the respective cells, and configured to discharge the output voltages from the respective cells; and a main microcomputer (33 configured: to find a state of charge of a rechargeable battery (13) on the basis of the output voltages from the cells measured by the voltage detection ICs; to judge whether or not the state of charge is a predetermined level; to find differential values by subtracting a predetermined baseline voltage from the output voltages from the cells measured by the voltage detection ICs; and to equalize the output voltages if there exists a cell whose differential value is not less than a first voltage threshold value, by use of the corresponding discharge circuit (40).
Cell voltage equalizer for multi-cell battery pack which determines the waiting time between equalization operations based on the voltage difference and the state of charge level
2016-09-13
Patent
Electronic Resource
English
IPC: | H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY |
European Patent Office | 2021
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