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：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：US20240264233A1

公开(公告)日：2024-08-08

申请号：US18639461

申请日：2024-04-18

Applicant: BYD COMPANY LIMITED

Inventor： Zhipei LU ,  Linwang DENG ,  Chengzhi WANG ,  Zeru TANG ,  Yantao LIU ,  Bojun XIONG ,  Xianyong WU ,  Congji E

IPC: G01R31/364 ,  B60R16/023 ,  H01M10/42

CPC classification number: G01R31/364 ,  B60R16/023 ,  H01M10/425 ,  H01M2010/4271 ,  H01M2220/20

Abstract: The present disclosure relates to the technical field of batteries, and provides a sampling device, a battery management system, and a vehicle. The sampling device includes multiple core function regions, an auxiliary function region, and a terminal connector. The multiple core function regions are configured to process information of a battery. The auxiliary function region has wiring arranged therein, and is configured to transmit a signal corresponding to the information. The multiple core function regions are cascaded through the wiring.

公开(公告)号：US20230168097A1

公开(公告)日：2023-06-01

申请号：US18154564

申请日：2023-01-13

Applicant: BYD COMPANY LIMITED

Inventor： Linwang DENG ,  Guanhao DU ,  Tianyu FENG ,  Sijia LIU

IPC: G01C21/34 ,  G01C21/36

CPC classification number: G01C21/3469 ,  G01C21/3461 ,  G01C21/3492 ,  G01C21/3682

Abstract: A path determination method includes: obtaining current position information and destination position information of a target vehicle; determining a candidate path of the target vehicle according to the current position information and the destination position information; acquiring road condition information of the candidate path and reference vehicle information; determining first energy consumption information required to be consumed by the target vehicle to travel on the candidate path over a unit distance according to the road condition information and the reference vehicle information; and recommending the candidate path to the target vehicle according to the first energy consumption information.

公开(公告)号：US20230093620A1

公开(公告)日：2023-03-23

申请号：US17994694

申请日：2022-11-28

Applicant: BYD COMPANY LIMITED

Inventor： Long HE ,  Linwang DENG ,  Tianyu FENG ,  Sijia LIU

IPC: B60L58/27

Abstract: A power battery heating method for an electric vehicle includes: acquiring a heating power demand of a power battery; acquiring power demand information of a driving module of the electric vehicle in real time, and determining a current heating power of the power battery according to the power demand information; acquiring a compensating heating current according to the heating power demand and the current heating power when the current heating power is less than the heating power demand; causing the motor controller to regulate a control current of the driving motor according to the compensating heating current, so that the driving motor outputs a high-frequency oscillation current equal to the compensating heating current; and causing the power battery to perform self-heating according to the high-frequency oscillation current outputted by the driving motor.

公开(公告)号：US20230025958A1

公开(公告)日：2023-01-26

申请号：US17780911

申请日：2020-10-23

Applicant: BYD COMPANY LIMITED

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

IPC: G01R31/374 ,  G01R31/3842 ,  G01R31/367 ,  B60R16/033 ,  H01M10/48 ,  H01M10/613 ,  H01M10/6554

Abstract: A battery internal temperature information processing method, a computer device, and a storage medium that first acquire off-line testing data for off-line testing a battery module and construct an equivalent thermal network model from the off-line testing data, determine optimal model parameters of the equivalent thermal network model based on a multi-objective function fitting method; thereafter, a first battery internal temperature estimate of the battery of the vehicle at a first moment in actual operation of the vehicle is determined, in turn, based on the acquired initial state vector values of the battery of the vehicle, first operational data at a first moment in actual operation of the vehicle, and an equivalent thermal network model including the optimal model parameters.