公开(公告)号：US20220196750A1

公开(公告)日：2022-06-23

申请号：US17693679

申请日：2022-03-14

Applicant: DENSO CORPORATION

Inventor： Yuri SANO ,  Hiroki FUJII ,  Koji OHIRA

IPC: G01R31/389 ,  G01R31/36 ,  G01R31/3842 ,  G01R31/374

Abstract: A battery state estimation apparatus calculates a measured DC resistance value of a DC resistance based on a current change amount and a voltage change amount, which are calculated in a predetermined period using measured current value and voltage value. The battery state estimation apparatus further calculates (i) a non-temperature dependent constant and (ii) a constant of a temperature dependent function based on (i) an estimated DC resistance value and (ii) the measured DC resistance value. The estimated DC resistance value is an estimated value of the measured DC resistance value; the estimated DC resistance value is represented as a sum of (i) the non-temperature dependent constant Ra, which indicates a temperature independent component of the DC resistance of the secondary battery, and (ii) the temperature dependent function Rb, which indicates a temperature dependent component of the DC resistance of the secondary battery.

公开(公告)号：US20160139207A1

公开(公告)日：2016-05-19

申请号：US14944989

申请日：2015-11-18

Applicant: DENSO CORPORATION

Inventor： Yuri SANO

IPC: G01R31/36 ,  G01R35/00

CPC classification number: G01R31/3651 ,  G01R31/3624

Abstract: In an apparatus, an OCV calculator measures a close circuit voltage (CCV) across an equivalent circuit of a storage battery, and calculates an open circuit voltage (OCV) across the storage battery based on the CCV, the equivalent circuit, and a current flowing through the storage battery. The equivalent circuit simulates an electrochemical behavior of the storage battery. The equivalent circuit includes the OCV as a power supply voltage and a predetermined internal impedance connected in series to the power supply voltage. The internal impedance includes a capacitance. A calculator calculates an SOC of the storage battery as a function of the OCV. A determiner determines whether the capacitance is saturated as a function of an electrical parameter associated with a charge stored in the capacitance. A diagnosing unit diagnoses whether the SOC of the storage battery is appropriate according to whether the capacitance is saturated.

Abstract translation: 在装置中，OCV计算器测量跨蓄电池的等效电路的闭路电压（CCV），并根据CCV，等效电路和流过的电流计算蓄电池两端的开路电压（OCV） 通过蓄电池。 等效电路模拟蓄电池的电化学行为。 等效电路包括作为电源电压的OCV和与电源电压串联连接的预定内部阻抗。 内部阻抗包括电容。 计算器计算蓄电池的SOC作为OCV的函数。 确定器确定电容是否饱和作为与存储在电容中的电荷相关联的电参数的函数。 诊断单元根据电容是否饱和来诊断蓄电池的SOC是否合适。