SECONDARY BATTERY SYSTEM AND VEHICLE

• Main Authors: KIKUCHI KYOKO, HAMAGUCHI HIROSHI
• Format: Patent
• Language: English
• Published: 18.04.2013
• Subjects: 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

PROBLEM TO BE SOLVED: To provide a secondary battery system that accurately estimates capacity reduction of a lithium ion secondary battery, and to provide a vehicle including the same.SOLUTION: The secondary battery system includes: dQ/dV calculation means (step S4) for calculating a dQ/dV value when a lithium ion secondary battery is charged by an external power source; differential value calculation means (step S6) for calculating a differential value dQ/dV by subtracting a minimum dQ/dV value from a maximum dQ/dV value calculated by the dQ/dV calculation means in a battery voltage range of 3.2-Vp(V); and capacity reduction estimation means (step S8) for estimating the capacity reduction of the battery from a differential value dQ/dV calculated by the differential value calculation means, on the basis of the data stored in advance in the secondary battery system and representing the correlation between the differential value dQ/dV and the amount of capacity reduced from initial capacity.