Title:
OCV-SOC CALIBRATION METHOD AND APPARATUS, OCV-SOC ESTIMATION METHOD AND APPARATUS, AND MEDIUM AND VEHICLE
Document Type and Number:
WIPO Patent Application WO/2023/197939
Kind Code:
A1
Abstract:
A battery OCV-SOC functional relational expression calibration method and apparatus, a battery SOC estimation method and apparatus, and a medium and a vehicle, which belong to the technical field of batteries. The calibration method comprises: acquiring a charge and discharge OCV-SOC curve, a charge OCV-SOC curve and a discharge OCV-SOC curve of a battery (S1); respectively fitting the curves to obtain three corresponding OCV-SOC functional relational expressions (S2); and then fitting the functional relational expressions to obtain a target OCV-SOC functional relational expression of the battery that includes hysteresis coefficients (S3). In the calibration method, the impact of hysteresis effects brought by the state of charge and the state of discharge of a battery is taken into consideration, a charge and discharge OCV-SOC curve, a charge OCV-SOC curve and a discharge OCV-SOC curve are fitted, and functional relationships between hysteresis parameters and an OCV and an SOC are established, such that an OCV-SOC functional relational expression is obtained, thereby reducing the impact brought by the hysteresis characteristic of the battery, and thus an SOC value obtained by measuring the OCV is more accurate.
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Inventors:
KANG WENRONG (CN)
HE JIAXIN (CN)
HE JIAXIN (CN)
Application Number:
PCT/CN2023/086791
Publication Date:
October 19, 2023
Filing Date:
April 07, 2023
Export Citation:
Assignee:
GREAT WALL MOTOR CO LTD (CN)
International Classes:
B60L58/12; G01R31/385; G01R31/367; G01R31/387
Foreign References:
| CN115308616A | 2022-11-08 | |||
| CN108829911A | 2018-11-16 | |||
| CN109856542A | 2019-06-07 | |||
| CN112415399A | 2021-02-26 | |||
| JP2021071415A | 2021-05-06 |
Other References:
QIANG GUO ，, SUN WEI-MING: "Research on SOC estimation method of lead-acid battery based on LPV theory", CHINESE BATTERY INDUSTRY, vol. 22, no. 3, 25 June 2018 (2018-06-25), pages 115 - 119, XP093098832
DENG-FANG BAN, ,ZHENG YAN-PING, CHANG CHENG-CHENG, SUN WEI-MING: "Study on hysteresis characteristics of lithium iron phosphate battery", CHINESE JOURNAL OF POWER SOURCES, vol. 43, no. 7, 20 July 2021 (2021-07-20), pages 1121 - 1124, XP093098839
DENG-FANG BAN, ,ZHENG YAN-PING, CHANG CHENG-CHENG, SUN WEI-MING: "Study on hysteresis characteristics of lithium iron phosphate battery", CHINESE JOURNAL OF POWER SOURCES, vol. 43, no. 7, 20 July 2021 (2021-07-20), pages 1121 - 1124, XP093098839
Attorney, Agent or Firm:
BEIJING RUN ZEHENG INTELLECTUAL PROPERTY LAW FIRM (CN)
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