BATTERY MONITORING DEVICE AND ELECTRIC VEHICLE HAVING THE SAME MOUNTED THEREON

• Main Authors: HORI YUKI, KURACHI DAISUKE, UCHIYAMA MASANORI
• Format: Patent
• Language: English; Japanese
• Published: 02.11.2022
• 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

To calculate the amount of electricity stored in a battery pack even when the amount of electricity stored in cell batteries is difficult to be calculated based on the voltage of the cell batteries.SOLUTION: A battery monitoring device 96 monitors a battery pack 93 having a series connection body of a plurality of cell batteries B. An impedance detection unit 31 of the battery monitoring device 96 detects the impedance Z of the plurality of cell batteries B in a pack electricity storage amount change period in which the amount of electricity Q stored in the battery pack 93 changes with the lapse of time. A cell electricity storage amount calculation unit 33 of the battery monitoring device 96 calculates the amount of electricity Q stored in the cell batteries B based on a change Zdd in the tendency in change Zd of the detected impedance Z. A pack electricity storage amount calculation unit 34 of the battery monitoring device 96 calculates the amount of electricity ΣQ stored in the battery pack 93 based on the calculated amount of electricity Q stored in the cell batteries B.SELECTED DRAWING: Figure 1 【課題】セル電池の電圧に基づいてセル電池の蓄電量を演算するのが難しい状況下においても、電池パックの蓄電量を演算できるようにする。【解決手段】電池監視装置９６は、複数のセル電池Ｂの直列接続体を有する電池パック９３を監視する。電池監視装置９６のインピーダンス検出部３１は、電池パック９３の蓄電量Ｑが時間経過に伴い変化するパック蓄電量変化時において、複数のセル電池ＢのインピーダンスＺを検出する。電池監視装置９６のセル蓄電量演算部３３は、検出されたインピーダンスＺの変化傾向Ｚｄの変化Ｚｄｄに基づいて、セル電池Ｂの蓄電量Ｑを演算する。電池監視装置９６のパック蓄電量演算部３４は、演算されたセル電池Ｂの蓄電量Ｑに基づいて、電池パック９３の蓄電量ΣＱを演算する。【選択図】 図１