Title:
BATTERY STATE OF HEALTH ESTIMATION METHOD BASED ON STANDARD SAMPLE AND DUAL-EMBEDDED DECOUPLING
Document Type and Number:
WIPO Patent Application WO/2022/160147
Kind Code:
A1
Abstract:
Disclosed is a battery state of health estimation method based on a standard sample and dual-embedded decoupling. The method comprises the steps of extracting a salient characteristic peak of a standard sample, calibrating a mechanism parameter of the standard sample, performing online evaluation on the SOH of a battery to be tested, etc. The present invention has the following beneficial effects: according to the present invention, a dual-coupling relationship of the influences of temperature and aging on a characteristic peak voltage of an IC curve is elaborated on from the perspective of impedance characteristic mechanism analysis, and it is proposed that a voltage offset caused by a charge transfer resistor which is most sensitive to temperature is eliminated on the basis of "a standard sample", thereby realizing first-layer decoupling; further, when it is set that an SEI film resistor influenced by aging and temperature coupling accords with an aging linear relationship as a whole, a linear relationship coefficient is only related to the temperature, so as to realize embedded decoupling; and by means of the present invention, the high-efficiency characteristic of estimating a battery SOH on the basis of an IC curve characteristic is inherited, and from the perspective of mechanism analysis, the problem of a low accuracy of solving, in a wide temperature range, a battery SOH on the basis of an IC curve is solved.
Inventors:
WANG LIMEI (CN)
QIAO SIBING (CN)
ZHAO XIULIANG (CN)
LU DONG (CN)
WANG RUOCHEN (CN)
XU YING (CN)
ZHANG YING (CN)
PAN CHAOFENG (CN)
HE ZHIGANG (CN)
CAI YINGFENG (CN)
CHEN LONG (CN)
QIAO SIBING (CN)
ZHAO XIULIANG (CN)
LU DONG (CN)
WANG RUOCHEN (CN)
XU YING (CN)
ZHANG YING (CN)
PAN CHAOFENG (CN)
HE ZHIGANG (CN)
CAI YINGFENG (CN)
CHEN LONG (CN)
Application Number:
PCT/CN2021/074051
Publication Date:
August 04, 2022
Filing Date:
January 28, 2021
Export Citation:
Assignee:
UNIV JIANGSU (CN)
International Classes:
G01R31/392
Foreign References:
| CN111693881A | 2020-09-22 | |||
| CN110635187A | 2019-12-31 | |||
| JP2019138673A | 2019-08-22 |
Other References:
WANG TIANSI: "CAPACITY-LOSS PREDICTION AND STATE-OF-HEALTH ESTIMATION IN LITHIUM-ION BATTERIES", CHINESE DOCTORAL DISSERTATIONS FULL-TEXT DATABASE, ENGINEERING TECHNOLOGY II, 2018, VOL. 01, C042-122, 15 January 2018 (2018-01-15), XP055955098
Attorney, Agent or Firm:
NANJING DOYES INTELLECTUAL PROPERTY CO., LTD. (CN)
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