公开(公告)号：EP4206711A1

公开(公告)日：2023-07-05

申请号：EP21871603.3

申请日：2021-09-24

Applicant: BYD Company Limited

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

IPC: G01R31/385 ,  G01R31/378 ,  H01M10/44

Abstract: The present disclosure relates to the technical field of batteries, and provides a method and a system for detecting a lithium plating state of a battery, a vehicle, a device, and a storage medium. The method 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 of the voltage 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; prompting that lithium plating occurs in the battery when detecting the characteristic peak voltage in the time-differential voltage curve; and prompting that the lithium plating does not occur in the battery when detecting no characteristic peak voltage in the time-differential voltage curve.

公开(公告)号：EP4393753A1

公开(公告)日：2024-07-03

申请号：EP22913913.4

申请日：2022-11-22

Applicant: BYD Company Limited

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

IPC: B60L3/12

CPC classification number: B60L3/12 ,  B60W40/08 ,  B60W40/09 ,  B60W40/105 ,  B60W50/00 ,  Y02T10/70

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：EP4220817A1

公开(公告)日：2023-08-02

申请号：EP21871605.8

申请日：2021-09-24

Applicant: BYD Company Limited

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

IPC: H01M10/44

Abstract: The present disclosure relates to the technical field of battery charging and provides a battery charging method and system based on lithium plating detection, a vehicle, and a medium. The method further 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 the first lithium plating detection result is that no lithium plating phenomenon occurs, and stopping the charging lithium plating detection when the first lithium plating detection result is that the lithium plating phenomenon occurs or the charging of the battery is completed; and updating the charging current in the battery charging strategy table according to a preset first current reduction strategy when the first lithium plating detection result is that the lithium plating phenomenon occurs, and continuing the charging of the battery according to the updated charging current until the charging is completed.

公开(公告)号：EP4390419A1

公开(公告)日：2024-06-26

申请号：EP22897312.9

申请日：2022-09-14

Applicant: BYD Company Limited

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

IPC: G01R31/388

CPC classification number: Y02E60/10 ,  G01R31/367 ,  G01R31/388 ,  G01R31/3842

Abstract: Disclosed are a battery capacity estimation method and apparatus, and a computer storage medium. The method includes: acquiring a voltage-capacity curve of a battery in real time in a battery charging process; performing differentiation on the voltage-capacity curve to obtain a voltage differential-capacity curve; determining a voltage knee point in the voltage-capacity curve according to the voltage differential-capacity curve; acquiring a pre-calibrated reference capacity value corresponding to the voltage knee point; acquiring charging electric quantity of the battery from the voltage knee point to a full-charge state; and obtaining actual capacity of the battery based on a sum of the reference capacity value and the charging electric quantity.

公开(公告)号：EP4220209A1

公开(公告)日：2023-08-02

申请号：EP21871029.1

申请日：2021-07-30

Applicant: BYD Company Limited

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

IPC: G01R31/389

Abstract: The present disclosure relates to the technical field of batteries, and particularly to a method for generating an electrochemical impedance spectrum for a battery, a medium, and a computer device. The method 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：EP4024069A1

公开(公告)日：2022-07-06

申请号：EP20870190.4

申请日：2020-09-25

Applicant: BYD Company Limited

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

IPC: G01R31/389 ,  G01R31/387

Abstract: Provided are a battery temperature estimation method and apparatus, an electronic device, and a storage medium, which relate to the field of battery technologies. The 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 being used for estimating the internal temperature of the battery by using the surface temperature and the admittances of the battery.