BATTERY MONITORING DEVICE

• 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; ELECTRICITY; GENERATION; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY

To provide a battery monitoring device capable of calculating a variation in a storage amount of electricity between cell batteries even in a situation where it is difficult to calculate the storage amount of electricity on the basis of a voltage of the cell battery.SOLUTION: In an electromotive vehicle 90, a battery monitoring device 96 monitors a battery pack 93 including a serially connected body of a plurality of cell batteries B. An impedance detection unit 31 in the battery monitoring device detects an impedance Z of the plurality of cell batteries B when a pack storage amount changes, i.e., when the storage amount of the battery pack changes over time. A storage amount identification unit 32 in the battery monitoring device identifies that a storage amount Q of a cell battery has reached a specific storage amount QL, QU on the basis of a change Zdd in a change trend Zd of the detected impedance. A variation computation unit 33 in the battery monitoring device computes a variation ΔQ in the storage amount between cell batteries on the basis of differences, between the cell batteries, in pieces of identification timing tP, tS at when the storage amount is identified to have reached the specific storage amount.SELECTED DRAWING: Figure 1 【課題】セル電池の電圧に基づいて蓄電量を演算するのが難しい状況下においても、セル電池どうしの間での蓄電量のバラツキを演算できる電池監視装置を提供する。【解決手段】電動車両９０において、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。電池監視装置のインピーダンス検出部３１は、電池パックの蓄電量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。電池監視装置の蓄電量特定部３２は、検出されているインピーダンスの変化傾向Ｚｄの変化Ｚｄｄに基づいて、セル電池の蓄電量Ｑが特定蓄電量ＱＬ、ＱＵになったと特定する。電池監視装置のバラツキ演算部３３は、セル電池どうしの間での、蓄電量が特定蓄電量になったと特定された特定タイミングｔＰ、ｔＳの違いに基づいて、セル電池どうしの間での蓄電量のバラツキΔＱを演算する。【選択図】図１