SAFE STATE DETECTION METHOD FOR LITHIUM-ION SECONDARY BATTERY, SAFE STATE DETECTION APPARATUS, POWER STORAGE DEVICE, SAFE STATE DETECTION SYSTEM, AND CARRIER MEANS

A safe state detection method for a lithium-ion secondary battery, includes: calculating (S1) an absolute value of a differential coefficient of a discharge curve from which a voltage equivalent to a voltage drop of the lithium-ion secondary battery is removed; determining (S3) a first battery volta...

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Bibliographische Detailangaben
1. Verfasser:	Nozu, Ryutaro
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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
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Zusammenfassung:	A safe state detection method for a lithium-ion secondary battery, includes: calculating (S1) an absolute value of a differential coefficient of a discharge curve from which a voltage equivalent to a voltage drop of the lithium-ion secondary battery is removed; determining (S3) a first battery voltage when the degree of increase in the absolute value of the differential coefficient is greater than a threshold value; determining (S3) a second battery voltage at a start of an increase in oxidation heat in response to the first battery voltage, the oxidation heat being heat generated inside the lithium-ion secondary battery when the lithium-ion secondary battery is overcharged; and detecting (S4, S5, S6, S7, S8) a safe state of the lithium-ion secondary battery, based on the determined second battery voltage.