To provide a secondary battery deterioration estimation method, life estimation method and control device, capable of using an in-vehicle lithium ion secondary battery until a target life by accurately estimating a deterioration in a secondary battery and controlling the secondary battery.SOLUTION: A secondary battery can be used until a target life by: acquiring deterioration information up to now from a step of calculating deviation capacity ΔQ corresponding to a positive and negative electrode composition to calculate the deviation capacity ΔQ corresponding to a positive and negative electrode composition, by multiplying a difference between an amount of decrease in negative electrode capacity ΔQNE and an amount of decrease in positive electrode capacity ΔQPE by a lapsed time Δt by an ECU mounted on a vehicle, the amount of decrease in negative electrode capacity and the amount of decrease in positive electrode capacity being calculated in a step of calculating an amount of decrease in negative electrode capacity and in a step of calculating an amount of decrease in positive electrode capacity, respectively (S10); determining input information of conditions to be predicted in future (S11); estimating deterioration at the end of a life target period (S12-17); determining whether the life target is reachable by comparing the estimated deterioration with a preset threshold (S18); and, if it is determined that the life target is not reachable, controlling such that an SOC usage area with a less deterioration amount is used (S20).SELECTED DRAWING: Figure 6
【課題】劣化を正確に推定し、これを制御することで車載のリチウムイオン二次電池を目標寿命まで使用可能とする。【解決手段】車両に搭載されたECUにより負極容量低下量算出のステップで算出した負極容量低下量ΔQNEと、正極容量低下量算出のステップで算出した正極容量低下量ΔQPEとの差に、経過時間Δtを乗じることで、正負極組成対応ずれ容量ΔQを算出する正負極組成対応ずれ容量ΔQ算出のステップとから現在までの劣化情報を取得し(S10)、将来予測される条件の入力情報を決定し(S11)、寿命目標期間終了時の劣化を推定し(S12〜17)、この推定された劣化と、予め設定された閾値と比較することで寿命目標が到達可能か否かを判定し(S18)、寿命目標に達しないと判定された場合には劣化量の少ないSOC使用域を使用するように制御する(S20)ことで、二次電池を寿命目標まで使用可能とする。【選択図】図6
SECONDARY BATTERY DETERIORATION ESTIMATION METHOD, LIFE ESTIMATION METHOD AND CONTROL DEVICE
二次電池の劣化推定方法、寿命推定方法、及び制御装置
2021-10-11
Patent
Electronic Resource
Japanese
IPC: | H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung |
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