US 11,988,717 B2
Measurement apparatus of power storage device and measurement method
Tetsuya Takahashi, Ueda (JP)
Assigned to HIOKI E.E. CORPORATION, Ueda (JP)
Appl. No. 17/597,934
Filed by HIOKI E.E. CORPORATION, Ueda (JP)
PCT Filed Apr. 15, 2020, PCT No. PCT/JP2020/016582
§ 371(c)(1), (2) Date Jan. 28, 2022,
PCT Pub. No. WO2021/019848, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 2019-139656 (JP), filed on Jul. 30, 2019; and application No. 2019-139659 (JP), filed on Jul. 30, 2019.
Prior Publication US 2022/0291290 A1, Sep. 15, 2022
Int. Cl. G01R 31/3835 (2019.01); G01R 19/12 (2006.01); G01R 31/36 (2020.01)
CPC G01R 31/3835 (2019.01) [G01R 19/12 (2013.01); G01R 31/3648 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A measurement apparatus of a power storage device comprising:
a constant current supply device configured to supply constant current to the power storage device;
a voltage measuring device configured to measure voltage of the power storage device; and
a controller configured to compute an internal state of the power storage device based on a voltage change in the power storage device subjected to measurement,
wherein the constant current supply device is configured to supply at least the constant current to the power storage device by setting the constant current to be one or several times a reference value of a self-discharge current of the power storage device, and
further wherein the voltage measuring device is configured to measure the voltage of the power storage device subjected to measurement at least twice.