公开(公告)号：US20250020728A1

公开(公告)日：2025-01-16

申请号：US18901670

申请日：2024-09-30

Applicant: DENSO CORPORATION

Inventor： Masaaki KITAGAWA ,  Isao ISHIBE ,  Kazuo MATSUKAWA ,  Shuhei YOSHIDA ,  Masaki UCHIYAMA

IPC: G01R31/389 ,  G01R31/367 ,  G01R31/387 ,  G01R31/392 ,  H01M10/48 ,  H02J7/00

Abstract: An impedance measurement apparatus is provided for measuring impedance of a secondary battery. The impedance measurement apparatus includes a measurement unit and a switching unit. The measurement unit is capable of measuring the impedance of the secondary battery using a plurality of measurement modes differing in measurement condition. The switching unit is configured to switch between the plurality of measurement modes based on a comparison between a correlating parameter, which correlates with the impedance of the secondary battery, and a threshold value.

公开(公告)号：US20230314529A1

公开(公告)日：2023-10-05

申请号：US18301448

申请日：2023-04-17

Applicant: DENSO CORPORATION

Inventor： Kazuo MATSUKAWA

IPC: G01R31/396 ,  G01R31/389 ,  G01R31/3842 ,  H02J7/00 ,  H01M10/48 ,  H01M10/42

CPC classification number: G01R31/396 ,  G01R31/3842 ,  G01R31/389 ,  H01M10/4264 ,  H01M10/482 ,  H02J7/0047

Abstract: A current application unit includes a load element, a switching element, and a shunt resistor connected in series between both terminals of an assembled battery, and a drive control unit of the switching element to apply an alternating current having a predetermined frequency to the assembled battery. The drive control unit includes: a PWM modulator for generating a drive signal; a PDM modulator for generating the drive signal; and a switching unit for switching between a first drive state for driving the switching element by the drive signal generated by the PWM modulator and a second drive state for driving the switching element by the drive signal generated by the PDM modulator.

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.