Invention Publication
- Patent Title: METHOD AND APPARATUS FOR DETERMINING STATE OF CHARGE AND BATTERY MANAGEMENT SYSTEM
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Application No.: US17915308Application Date: 2021-03-15
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Publication No.: US20230152380A1Publication Date: 2023-05-18
- Inventor: Sijia LIU , Tianyu FENG , Linwang DENG , Xiaoqian LI , Xun SONG
- Applicant: BYD COMPANY LIMITED
- Applicant Address: CN Shenzhen, Guangdong
- Assignee: BYD COMPANY LIMITED
- Current Assignee: BYD COMPANY LIMITED
- Current Assignee Address: CN Shenzhen, Guangdong
- Priority: CN 2010245899.9 2020.03.31
- International Application: PCT/CN2021/080767 2021.03.15
- Date entered country: 2022-09-28
- Main IPC: G01R31/3842
- IPC: G01R31/3842 ; G01R31/367 ; G01R31/36 ; G01R31/396

Abstract:
The present disclosure relates to a method and apparatus for determining a state of charge (SOC) of a battery and a battery management system (BMS), so as to resolve a problem such as inaccurate estimation of the SOC. The method includes: acquiring state data of the battery, where the state data comprises current data and voltage data; determining each element parameter value in an equivalent circuit model of the battery based on the equivalent circuit model, error information, battery characteristic data, and the state data by using a recursive least square (RLS) prediction model; and determining an estimated value of the SOC of the battery based on the element parameter value in the equivalent circuit model, the state data, and the battery characteristic data according to a technique of an observer.
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