公开(公告)号：US20230231209A1

公开(公告)日：2023-07-20

申请号：US18074566

申请日：2022-12-05

Applicant: DENSO CORPORATION

Inventor： Yuji YAMAGAMI ,  Masaaki KITAGAWA ,  Hisashi UMEMOTO ,  Shuhei YOSHIDA

IPC: H01M10/48 ,  H01M10/46 ,  H02J7/00

CPC classification number: H01M10/48 ,  H01M10/46 ,  H02J7/00714 ,  H01M2220/20 ,  H01M2010/4292

Abstract: A secondary battery system includes a secondary battery having an electrode body impregnated with an electrolytic solution containing metal ions. The secondary battery system measures an impedance of the secondary battery. The secondary battery system detects high-rate deterioration caused by uneven concentration of the metal ions in the electrolytic solution impregnated into the electrode body.

公开(公告)号：US20220373602A1

公开(公告)日：2022-11-24

申请号：US17869193

申请日：2022-07-20

Applicant: DENSO CORPORATION

Inventor： Masaaki KITAGAWA ,  Kazuo MATSUKAWA ,  Yuji YAMAGAMI ,  Masaki UCHIYAMA

IPC: G01R31/36 ,  G01R31/389 ,  H01M10/48 ,  H01M50/569 ,  H01M10/42 ,  H01M50/317 ,  H01M50/103 ,  H01M50/55 ,  H01M50/557 ,  H01M50/107 ,  H01M50/559 ,  H01M50/548

Abstract: In a battery measurement apparatus, a signal control unit, provided on a first electrical path connecting electrodes of a storage battery, causes the storage battery to output a predetermined alternating-current signal or inputs a predetermined alternating-current signal to the storage battery. A response signal input unit, provided on a second electrical path connecting the electrodes, inputs a response signal of the storage battery in response to the alternating-current signal through the second electrical path. Based on the response signal, a calculating unit calculates information related to a complex impedance of the storage battery. A magnetic flux passage area, surrounded by the storage battery and the second electrical path, is formed. A size of the magnetic flux passage area is set such that an error between an actual complex impedance of the storage battery and a complex impedance calculated by the calculating unit is within a range of ±1 mΩ.

公开(公告)号：US20230090001A1

公开(公告)日：2023-03-23

申请号：US18070233

申请日：2022-11-28

Applicant: DENSO CORPORATION

Inventor： Yuji YAMAGAMI ,  Shuhei YOSHIDA ,  Hisashi UMEMOTO

IPC: G01R31/389 ,  G01R31/36 ,  G01R31/392 ,  G01R31/3842

Abstract: A battery diagnostic system includes a superimposed current applying unit, a current value acquiring unit, a voltage value acquiring unit, an impedance calculating unit, and a diagnostic unit. The superimposed current applying unit configured to apply a superimposed current formed by superimposing a plurality of frequency components to a battery. The current value acquiring unit acquires the current value of the superimposed current applied to the battery. The voltage value acquiring unit acquires a battery voltage of the battery to which the superimposed current is applied. The impedance calculating unit calculates impedance for each of a plurality of frequency components using discrete Fourier transform from the superimposed current and the battery voltage. The diagnostic unit diagnoses the battery based on the impedance.

公开(公告)号：US20250130285A1

公开(公告)日：2025-04-24

申请号：US19007467

申请日：2024-12-31

Applicant: DENSO CORPORATION

Inventor： Shuhei YOSHIDA ,  Yuji YAMAGAMI

IPC: G01R31/389 ,  G01R31/36 ,  G01R31/367 ,  G01R31/374 ,  G01R31/3842 ,  G01R31/392

Abstract: A thermal runaway sign detection device includes a measurement unit that measures a voltage fluctuation in a first mode in which a number of times that a fluctuating current is output from the secondary battery and voltage fluctuation of the secondary battery in response to the fluctuating current is measured is first number of times, and in a second mode in which the number of times is second number of times less than the first number of times. A detection unit detects a sign of thermal runaway in the secondary battery when a rate of change in a real part of an AC impedance obtained based on the voltage fluctuation measured by the measurement unit at the fluctuating current of a predetermined frequency at which an imaginary part of the AC impedance of the secondary battery calculated based on the voltage fluctuation becomes zero, is greater than a threshold value.

公开(公告)号：US20230324471A1

公开(公告)日：2023-10-12

申请号：US18335123

申请日：2023-06-14

Applicant: DENSO CORPORATION

Inventor： Hisashi UMEMOTO ,  Yuji YAMAGAMI ,  Shuhei YOSHIDA ,  Masaki UCHIYAMA

IPC: G01R31/392 ,  H01M10/44 ,  H01M10/48 ,  G01R31/389

CPC classification number: G01R31/392 ,  H01M10/44 ,  H01M10/48 ,  G01R31/389 ,  H01M2220/20

Abstract: A control device includes a diagnosis unit configured to diagnose a deterioration state of a secondary battery. The diagnosis unit includes: a resistance calculator configured to calculate a direct current resistance and a reaction resistance of impedance components based on an impedance measurement result of the secondary battery; an index value calculator configured to calculate an index value related to the direct current resistance and the reaction resistance; and a deterioration determination unit configured to compare the index value with a determination threshold based on an impedance characteristic at the time of normal deterioration of the secondary battery so as to determine whether a specific deterioration occurs due to charge and discharge of the secondary battery.