DEVICE FOR ESTIMATING DEGRADATION OF POWER STORAGE ELEMENT, AND DEGRADATION ESTIMATION METHOD

• Main Authors: MATSUDA YUKI, KUNITA SATOSHI, WADA NAOYA, FUJIMATSU MASAKATSU, SUGIURA AKIMASA
• Format: Patent
• Language: English; Japanese
• Published: 29.10.2020
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY; TESTING

To estimate the degradation of a power storage element having a plateau region with good accuracy in a practical range of hours without being affected by the use environment or use state of the power storage element.SOLUTION: Provided is a degradation estimating device for a secondary battery used in starting an engine of a motorcycle, the secondary battery having a plateau region where a change of OCV to a change of SCO is relatively small. The degradation estimating device comprises: a charger for charging the secondary battery; a voltage sensor for measuring voltage of the secondary battery; and a control unit. The control unit executes a first estimation process of charging the secondary battery with the charger from a voltage V1 lower than a bottom voltage Vp1 of the plateau region to a voltage V2 higher than a top voltage Vp2 of the plateau region and estimating degradation of the secondary battery on the basis of a charge amount which is charged during that time.SELECTED DRAWING: Figure 5 【課題】プラトー領域を有する蓄電素子の劣化度を、実用的な時間の範囲で、蓄電素子の使用環境や使用状況などに影響されることなく精度よく推定すること。【解決手段】自動二輪車のエンジン始動に用いられる二次電池の劣化推定装置であって、二次電池はＳＯＣの変化に対するＯＣＶの変化が相対的に小さいプラトー領域を有するものであり、劣化推定装置は、二次電池を充電する充電器と、二次電池の電圧を計測する電圧センサと、制御部と、を備え、制御部は、プラトー領域の下端電圧Ｖｐ１より低い電圧Ｖ１からプラトー領域の上端電圧Ｖｐ２より高い電圧Ｖ２まで二次電池を充電器によって充電し、その間に充電された充電量に基づいて二次電池の劣化度を推定する第１の推定処理を実行する。【選択図】図５