Battery system and method of estimating polarization voltage of secondary battery

A battery pack comprises a battery, a voltage sensor that detects a voltage of the battery, a power converter that transmits and receives electric power to and from the battery, an SMR and a charging relay electrically connected between the battery and the power converter, and a processor that estim...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	Sugo, Yuki
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES ELECTRICITY ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL GENERATION MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PERFORMING OPERATIONS PHYSICS PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY SYSTEMS FOR STORING ELECTRIC ENERGY TESTING TRANSPORTING VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	A battery pack comprises a battery, a voltage sensor that detects a voltage of the battery, a power converter that transmits and receives electric power to and from the battery, an SMR and a charging relay electrically connected between the battery and the power converter, and a processor that estimates a polarization voltage Vp of the battery according to the following formula: Vp=a×{1−exp(−√t/b)}. The processor determines coefficients a and b based on first and second voltages. The first voltage is detected by the voltage sensor within a first period of time after the SMR is opened and the second voltage is detected by the voltage sensor within a second period of time before the charging relay is closed.