BATTERY SYSTEM CONTROL METHOD AND CONTROL DEVICE

• Main Authors: SUZUKI KOHEI, IGUCHI TOYOKI
• Format: Patent
• Language: English; Japanese
• Published: 29.09.2023
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

To improve the accuracy of estimating an SOC and suppress a driver's uneasiness due to a sudden change of the value being calculated on the basis of the estimated value of the SOC.SOLUTION: Provided is a battery system control method that estimates a control SOC that represents a charge rate used for control, on the basis of the integrated value of charge/discharge currents of a secondary battery, estimates a correction SOC that represents a charge rate for correction on the basis of the open-circuit voltage of the secondary battery when at least the ratio of the change amount of the open-circuit voltage of the secondary battery to the change amount of the charge rate lies in a high change rate region greater than or equal to a first threshold, and corrects the control SOC on the basis of the correction SOC when in the high change rate region. When a difference between the control SOC before correction and the control SOC after correction is larger than a second threshold, a display SOC that represents a charge rate displayed to a meter is gradually brought closer to the control SOC after correction.SELECTED DRAWING: Figure 1 【課題】ＳＯＣの推定精度を向上させ、かつＳＯＣの推定値に基づいて算出されている値の急変による運転者の違和感を抑制する。【解決手段】二次電池の充放電電流の積算値に基づいて、制御に用いる充電率である制御ＳＯＣを推定し、少なくとも充電率の変化量に対する二次電池の開放電圧の変化量の割合が第１閾値以上の高変化率領域にあるときに、二次電池の開放電圧に基づいて補正用の充電率である補正ＳＯＣを推定し、高変化率領域にあるときに、補正ＳＯＣに基づいて制御ＳＯＣを補正する、バッテリシステムの制御方法において、補正前の制御ＳＯＣと補正後の制御ＳＯＣとの差分が第２閾値より大きい場合には、メータに表示する充電率である表示ＳＯＣを、補正後の制御ＳＯＣに徐々に近づけることを特徴とするバッテリシステムの制御方法。【選択図】図１