US 12,169,225 B2
Secondary battery inspection method and secondary battery inspection device
Ichiro Munakata, Fukushima (JP); Satoshi Tanno, Fukushima (JP); and Hideki Shoji, Fukushima (JP)
Assigned to TOYO SYSTEM CO., LTD, Fukushima (JP)
Appl. No. 17/609,854
Filed by Toyo System Co., Ltd., Fukushima (JP)
PCT Filed Mar. 19, 2021, PCT No. PCT/JP2021/011440
§ 371(c)(1), (2) Date Nov. 9, 2021,
PCT Pub. No. WO2021/210346, PCT Pub. Date Oct. 21, 2021.
Claims priority of application No. 2020-071765 (JP), filed on Apr. 13, 2020.
Prior Publication US 2023/0034016 A1, Feb. 2, 2023
Int. Cl. G01R 31/389 (2019.01); G01R 31/367 (2019.01); G01R 31/374 (2019.01); G01R 31/3842 (2019.01)
CPC G01R 31/389 (2019.01) [G01R 31/367 (2019.01); G01R 31/374 (2019.01); G01R 31/3842 (2019.01)] 4 Claims
OG exemplary drawing
 
1. A secondary battery inspection device operably coupled to a current sensor and a voltage sensor respectively configured to measure an applied impulse current and a voltage of a secondary battery under inspection, the secondary battery inspection device comprising:
a memory storing a program and data related to at least one secondary battery model; and
a hardware processor which, under control of the program stored in the memory, is configured to execute processes comprising:
a voltage recognition process comprising receiving, from the voltage sensor, input of a measurement result of the voltage of the secondary battery when the impulse current flows into the secondary battery;
a model parameter setting process comprising identifying values of coefficients of transfer functions respectively representing an IIR system and an FIR system, each of the transfer functions being defined by a value of a coefficient in an s region expressing an impedance of an internal resistance of the secondary battery, and a sampling period which is an inverse of a sampling frequency when the transfer function in the s region is converted by bilinear-transformation to a transfer function in a z region, and the values of the coefficients being identified, based on a predetermined sampling period, as a value of a model parameter of a secondary battery model, from among the at least one secondary battery model stored in the memory, in which the impedance of the internal resistance of the secondary battery is expressed by the transfer functions respectively representing the IIR system and the FIR system;
a voltage estimation process comprising receiving, from the current sensor, input of a measurement result of the impulse current, inputting the measurement result of the impulse current to a specified model as the secondary battery model the value of the model parameter of which is identified in the model parameter setting process, and estimating a model output voltage as a voltage change form output from the specified model;
an evaluation process comprising evaluating a performance of the secondary battery according to the predetermined sampling period based on the measurement result of the voltage of the secondary battery received in the voltage recognition process, and the specified model output voltage estimated in the voltage estimation process; and
an output process comprising outputting a result of the evaluation process.