This method for diagnosing a battery pack having a configuration in which a plurality of cells are connected in series, using a system for obtaining detected data including the current and temperature of the battery pack and the voltage of each cell, includes: a step of calculating an electric charge capacity and a state of charge (SOC) of each cell, using the current and the temperature, the voltage of each cell, an open circuit voltage (OCV) - SOC function, and an OCV - resistance table, and calculating an amount of unbalance, which is an estimated value of the SOC, and the resistance for each cell when the battery pack is fully charged; and a step of calculating the energy capacity of the battery pack using the electric charge capacity, the amount of unbalance, and the resistances. As a result, the energy capacity of the battery pack can be calculated accurately, even in an unbalanced state.
Battery pack diagnosing method, cell diagnosing method, battery pack diagnosing device, and cell diagnosing device
2024-03-07
Patent
Elektronische Ressource
Englisch
IPC: | 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 / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / G16Y / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung |
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