公开(公告)号：US20230221373A1

公开(公告)日：2023-07-13

申请号：US18188788

申请日：2023-03-23

Applicant: BYD COMPANY LIMITED

Inventor： Linwang DENG ,  Tianyu FENG ,  Shiwei SHU ,  Sijia LIU

IPC: G01R31/3835 ,  G01R31/371

CPC classification number: G01R31/3835 ,  G01R31/371

Abstract: A method for detecting a lithium plating state of a battery includes regularly collecting a voltage of a battery after the end of charging at a preset time interval after the battery is in an idle state, and associatively storing the collected voltage and a collection time as voltage data; constructing a time-differential voltage curve in a voltage-time coordinate system according to the voltage data; detecting whether a characteristic peak voltage exists in the time-differential voltage curve; and sending a warning message when detecting that the characteristic peak voltage exists in the time-differential voltage curve.

公开(公告)号：US20220357399A1

公开(公告)日：2022-11-10

申请号：US17764340

申请日：2020-09-25

Applicant: BYD COMPANY LIMITED

Inventor： Xiaoqian LI ,  Tianyu FENG ,  Sijia LIU ,  Yonggang YIN ,  Shiwei SHU

IPC: G01R31/367 ,  G01R31/389 ,  G01R31/382 ,  G01R31/374

Abstract: A battery temperature estimation method includes fitting, when a battery is in an offline state, a first function relationship according to corresponding admittances of the battery at different test temperatures, and obtaining a temperature distribution model of the battery according to the shape and the size of the battery, and determining a second function relationship corresponding to internal temperatures and a surface temperature by combining with the first function relationship. The second function relationship is used for estimating the internal temperature of the battery by using the surface temperature and the admittances of the battery.

公开(公告)号：US20240230771A1

公开(公告)日：2024-07-11

申请号：US18610753

申请日：2024-03-20

Applicant: BYD COMPANY LIMITED

Inventor： Shiwei SHU ,  Tianyu FENG ,  Linwang DENG

IPC: G01R31/3835 ,  G01R31/392 ,  H01M10/0525 ,  H01M10/44 ,  H02J7/00

CPC classification number: G01R31/3835 ,  G01R31/392 ,  H01M10/44 ,  H02J7/0049 ,  H02J7/005 ,  H01M10/0525 ,  H01M2220/20

Abstract: A method of obtaining battery capacity, includes: acquiring a voltage-capacity curve of a battery; performing differentiation on the voltage-capacity curve to obtain a voltage differential-capacity curve; identifying wave crests in the voltage differential-capacity curve; calculating heights and widths between each wave crest and the adjacent wave trough on the left and the right;
calculating a determination index p according to the heights and the widths; determining a voltage knee point in the voltage-capacity curve according to a wave crest with a minimum determination index; acquiring a reference capacity value corresponding to the voltage knee point in the voltage-capacity curve; after the battery reaches a full-charge state, acquiring charging electric energy of the battery for charging from the voltage knee point to the full-charge state; and obtaining a capacity of the battery based on a sum of the reference capacity value and the charging electric energy.

公开(公告)号：US20230236257A1

公开(公告)日：2023-07-27

申请号：US18189607

申请日：2023-03-24

Applicant: BYD COMPANY LIMITED

Inventor： Tianyu FENG ,  Linwang DENG ,  Shiwei SHU ,  Xiaoqian LI

IPC: G01R31/389 ,  G01R25/00 ,  G01R23/16 ,  H02J7/00

CPC classification number: G01R31/389 ,  G01R23/16 ,  G01R25/00 ,  H02J7/0047

Abstract: A method for generating an electrochemical impedance spectrum for a battery includes: collecting, in a discharge state of a battery, battery discharge information of the battery periodically according to a preset collection interval, where the battery discharge information includes collection time, and current information and voltage information associated with the collection time; performing Fourier transform according to the collection interval and battery discharge information, to obtain multiple frequency-based first battery signals; determining a second battery signal from the multiple first battery signals, where the second battery signal includes a voltage signal greater than or equal to a preset voltage threshold; and determining an electrochemical impedance at a corresponding frequency according to the second battery signal, and constructing an electrochemical impedance spectrum according to all the electrochemical impedance.

公开(公告)号：US20240239203A1

公开(公告)日：2024-07-18

申请号：US18622991

申请日：2024-03-31

Applicant: BYD COMPANY LIMITED

Inventor： Tianyu FENG ,  Zhan SHU ,  Linwang DENG ,  Shiwei SHU

IPC: B60L3/12 ,  B60L58/10

CPC classification number: B60L3/12 ,  B60L58/10 ,  B60L2260/54

Abstract: Disclosed are a user type identification method, an electronic device, and a readable storage medium. The method includes: obtaining driving data in a preset time period, where the driving data includes at least a driving time, an accumulated driving mileage, and a driving speed in a vehicle driving process; obtaining to-be-analyzed data based on the driving data in the preset time period, where the to-be-analyzed data includes daily driving duration, a daily driving mileage, and a quantity of times of driving at each moment daily; and performing analysis on the to-be-analyzed data through a preset identification model, to obtain a user type.

公开(公告)号：US20230231403A1

公开(公告)日：2023-07-20

申请号：US18189474

申请日：2023-03-24

Applicant: BYD COMPANY LIMITED

Inventor： Tianyu FENG ,  Shiwei SHU ,  Linwang DENG ,  Xiaoqian LI

IPC: H02J7/00 ,  G01R31/3835 ,  G01R31/389 ,  H01M10/44 ,  H01M10/48

CPC classification number: H02J7/00714 ,  G01R31/389 ,  G01R31/3835 ,  H01M10/44 ,  H01M10/48 ,  H02J7/0047 ,  B60R16/033 ,  H01M2220/20

Abstract: A battery charging method based on lithium plating detection includes: acquiring a battery charging strategy table after receiving a battery charging instruction; charging a battery according to a charging current in the battery charging strategy table, and performing at least one charging lithium plating detection on the battery during the charging of the battery, to obtain a first lithium plating detection result; continuing the charging of the battery according to the charging current and the charging lithium plating detection of the battery when no lithium plating phenomenon occurs, and stopping the charging lithium plating detection when the lithium plating phenomenon occurs or the charging of the battery is completed; and updating the charging current according to a preset first current reduction strategy when the lithium plating phenomenon occurs, and continuing the charging of the battery according to the updated charging current until the charging is completed.