Title:
Battery evaluation method and battery characteristic evaluation device
Document Type and Number:
Japanese Patent JP6337233
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To simultaneously and individually evaluate impedance of a positive electrode and a negative electrode.SOLUTION: An impedance measurement device 3 has a control unit 9 and a frequency response analysis unit 10. The control unit 9 inputs potential signals (or current signals) having different frequencies between a positive electrode 5 and a negative electrode 6 on the basis of input signals from the frequency response analysis unit 10, and outputs current flowing between the positive electrode 5 and the negative electrode 6 and potential difference between the positive electrode 5 and the negative electrode 6, which are measured according the input signals, as response signals to the frequency response analysis unit 10. The frequency response analysis unit 10 has a first measurement unit 11 measuring potential difference between the positive electrode 5 and a reference electrode 7, and a second measurement unit 12 measuring potential difference between the negative electrode 6 and the reference electrode 7; calculates impedance between the positive electrode 5 and the reference electrode 7 on the basis of the response signals from the control unit 9 and potential difference Vmeasured by the first measurement unit 11; and calculates impedance between the negative electrode 6 and the reference electrode 7 on the basis of the response signals from the control unit 9 and potential difference Vmeasured by the second measurement unit 12.SELECTED DRAWING: Figure 3
Inventors:
Shitanda Isao
Masayuki Itagaki
Shigeo Aoyagi
Fukuizumi Atsushi
Kota Kobayashi
Junpei Morotomi
Hiroyuki Tominaga
Masayuki Itagaki
Shigeo Aoyagi
Fukuizumi Atsushi
Kota Kobayashi
Junpei Morotomi
Hiroyuki Tominaga
Application Number:
JP2014173644A
Publication Date:
June 06, 2018
Filing Date:
August 28, 2014
Export Citation:
Assignee:
Tokyo University of Science
Hokuto Denko Co., Ltd.
Hokuto Denko Co., Ltd.
International Classes:
G01R31/36; G01R27/02; H01M10/48
Domestic Patent References:
| JP2014059174A | ||||
| JP2003014796A | ||||
| JP2012079582A |
Other References:
M. Itagaki,外5名,In Situ electrochemical impedance spectroscopy to investigate negative electrode of lithium-ion rechargeable batteries,Journal of Power Sources,2004年 4月 1日,135,255-261
Attorney, Agent or Firm:
Hiromichi Kobayashi
Uzawa Hidehisa
Uzawa Hidehisa
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