BATTERY MANAGEMENT DEVICE, BATTERY SYSTEM, AND VEHICLE POWER SUPPLY SYSTEM

• Main Authors: HAYAYAMA, Kazuya, OHCHI, Yukikazu, NAGAYAMA, Masatoshi, SADA, Tomokazu
• Format: Patent
• Language: English
• Published: 17.12.2020
• 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

A state estimator 141 estimates, based on at least one of a voltage, a current, and a temperature of a secondary battery 20, a state of the secondary battery 20 including a state of charge (SOC) of the secondary battery 20. A discharge controller 142 discharges, when a state of non-use of the secondary battery 20 lasts for a predetermined period of time, the secondary battery 20 such that an indicator indicating easiness of storage deterioration of the secondary battery 20 to progress decreases in stages. The indicator includes a parameter that depends on an SOC of the secondary battery 20. A value of the indicator and a duration of stay in each stage are set such that a predetermined relationship holds between products in a plurality of stages, each of the products being derived from multiplying the value of the indicator and the duration of stay in each stage.