公开(公告)号：US20240353499A1

公开(公告)日：2024-10-24

申请号：US18758033

申请日：2024-06-28

Applicant: BYD COMPANY LIMITED

Inventor： Xiaoqian LI ,  Tianyu FENG ,  Linwang DENG ,  Jingjing HONG

IPC: G01R31/392 ,  G01R31/3835 ,  H02J7/00

CPC classification number: G01R31/392 ,  G01R31/3835 ,  H02J7/0047

Abstract: A method for determining a battery capacity, includes: acquiring a first inflection voltage, a first inflection electric power, a second inflection voltage, and a second inflection electric power of the battery, charging the battery and recording a first charging profile of the battery; determining a target inflection point of the battery according to the first charging profile; detecting the electric power until the charging is completed, acquiring a first charged electric power of the battery when the battery is charged to a first inflection point, and acquiring a second charged electric power of the battery when the charging is completed; and when the target inflection point includes the first inflection point, calculating a current capacity of the battery according to the first inflection electric power, the first charged electric power, and the second charged electric power. The first inflection voltage is greater than the second inflection voltage.

公开(公告)号：US20230112978A1

公开(公告)日：2023-04-13

申请号：US18080168

申请日：2022-12-13

Applicant: BYD COMPANY LIMITED

Inventor： Linwang DENG ,  Xiaoqian LI ,  Tianyu FENG ,  Sijia LIU

IPC: G01R31/392 ,  G01R19/165 ,  G01R31/3835 ,  G01R31/367

Abstract: A method for calculating a cell state includes: acquiring a first knee-point voltage threshold of a cell, a first knee-point electricity corresponding to the first knee-point voltage threshold, a second knee-point voltage threshold of the cell and a second knee-point electricity corresponding to the second knee-point voltage threshold; recording a first charging curve of the cell in real time; obtaining a target knee point according to the first charging curve, the first knee-point voltage threshold, and the second knee-point voltage threshold, and obtaining a target-knee-point electricity according to the first knee-point electricity or the second knee-point electricity; detecting the electricity of the cell until the charging is completed, and obtaining a charged electricity of the cell from the target knee point to the completion of charging; and obtaining the capacity of the cell according to the target-knee-point electricity and the charged electricity.

公开(公告)号：US20250038557A1

公开(公告)日：2025-01-30

申请号：US18915822

申请日：2024-10-15

Applicant: BYD COMPANY LIMITED

Inventor： Linwang DENG ,  Tianyu FENG ,  Shi XIONG

IPC: H02J7/00 ,  B60L50/60 ,  B60L58/12 ,  H01M10/42 ,  H01M10/44 ,  H01M10/46 ,  H02J7/34 ,  H02M3/158

Abstract: A battery circuit comprises: a power source end, a first battery pack, a second battery pack, a voltage transformation unit, a first switch, a second switch and a ground end. A positive electrode of the first battery pack is connected to the power source end, and a negative electrode of the first battery pack is connected to a positive electrode of the second battery pack; a negative electrode of the second battery pack is connected to the ground end; a first end of the first switch is connected to the power source end, and a second end of the first switch is connected to a first end of the second switch; a second end of the second switch is connected to the ground end; and the voltage transformation unit is connected between the negative electrode of the first battery pack and the second end of the first switch.

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.

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：US20240019496A1

公开(公告)日：2024-01-18

申请号：US18373821

申请日：2023-09-27

Applicant: BYD COMPANY LIMITED

Inventor： Linwang DENG ,  Tianyu FENG ,  Pengqing ZHANG ,  Xiaoqian LI

IPC: G01R31/367 ,  G01R31/392 ,  G01R31/387 ,  G01R31/374

CPC classification number: G01R31/367 ,  G01R31/392 ,  G01R31/387 ,  G01R31/374

Abstract: A method for obtaining a capacity of a power battery includes: collecting, by sensors, sample data of the power battery; dividing, by a processor, the sample data into multiple categories, each of the categories having a corresponding aging model and a feature identifier, the feature identifier identifying features of sample data of a corresponding category, and the aging model being obtained by: determining a fitting relationship in the aging model, and determining parameters in the fitting relationship according to sample data of a corresponding type of the aging model; acquiring, by the processor, battery state parameters of the power battery; selecting, by the processor, an aging model from multiple aging models according to the battery state parameters; and inputting, by the processor, the battery state parameters into the selected aging model to obtain the capacity of the power battery.

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：US20230093420A1

公开(公告)日：2023-03-23

申请号：US17994730

申请日：2022-11-28

Applicant: BYD COMPANY LIMITED

Inventor： Linwang DENG ,  Yonggang YIN ,  Tianyu FENG ,  Sijia LIU

IPC: G01R31/3835 ,  G01K1/14 ,  G01K3/00 ,  H01M10/48

Abstract: A warning method for battery thermal runaway includes: acquiring current temperature data of each temperature sensor arranged in a battery pack, current voltage data of each voltage sensor arranged in the battery pack, and current sensor disconnection data of each temperature sensor; calculating a number of occurrences of a primary feature at a current moment according to the current temperature data; calculating a number of occurrences of a secondary feature at the current moment according to the current voltage data and the current sensor disconnection data in a case that the number of occurrences of the primary feature is greater than 0; calculating a sum of the number of occurrences of the primary feature and the number of occurrences of the secondary feature at the current moment; and sending a warning for battery thermal runaway when the sum is greater than a preset feature number threshold.

公开(公告)号：US20240300379A1

公开(公告)日：2024-09-12

申请号：US18669524

申请日：2024-05-21

Applicant: BYD COMPANY LIMITED

Inventor： Linwang DENG ,  Xiaoqian LI ,  Tianyu FENG ,  Jingjing HONG

IPC: B60L58/14 ,  H01M10/42 ,  H02J7/00

CPC classification number: B60L58/14 ,  H01M10/425 ,  H02J7/0047 ,  H02J7/00712 ,  H01M2010/4271 ,  H01M2220/20

Abstract: A battery management method includes: obtaining a current high-voltage inflection point power value of each cell; obtaining a current historical cumulative balance power value of each cell; obtaining a current equivalent self-discharge value of each cell through calculation; obtaining an equivalent self-discharge value at a previous moment of each cell; obtaining a target equivalent self-discharge value of each cell through calculation; determining a maximum target equivalent self-discharge value and a minimum target equivalent self-discharge value; obtaining a maximum equivalent self-discharge rate and a minimum equivalent self-discharge rate through calculation; and when a difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a preset threshold, managing a target cell corresponding to the maximum target equivalent self-discharge value.