公开(公告)号：EP4184120A1

公开(公告)日：2023-05-24

申请号：EP21851090.7

申请日：2021-07-27

Applicant: BYD Company Limited

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

IPC: G01C21/34

Abstract: Embodiments of the present disclosure disclose a path determination method and apparatus, a device and a medium. The method includes the steps of: 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. With the embodiments of the present disclosure, the vehicle operation efficiency is improved.

公开(公告)号：EP4145583A1

公开(公告)日：2023-03-08

申请号：EP21812195.2

申请日：2021-05-17

Applicant: BYD Company Limited

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

IPC: H01M10/42 ,  H01M10/48 ,  G01R31/382

Abstract: The present disclosure belongs to the field of battery management technologies, and relates to a warning method and apparatus for battery thermal runaway, a medium, and a device. The 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 in a case that the sum is greater than a preset feature number threshold.

公开(公告)号：EP4130769A1

公开(公告)日：2023-02-08

申请号：EP21781308.8

申请日：2021-03-15

Applicant: BYD Company Limited

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

IPC: G01R31/3842

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.

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：EP4067919A1

公开(公告)日：2022-10-05

申请号：EP20891499.4

申请日：2020-10-23

Applicant: BYD Company Limited

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

IPC: G01R31/367

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.

公开(公告)号：EP4155120A1

公开(公告)日：2023-03-29

申请号：EP21814346.9

申请日：2021-05-25

Applicant: BYD Company Limited

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

IPC: B60L58/27 ,  B60L58/00 ,  B60L58/10 ,  B60L58/24 ,  H01M10/615 ,  H01M10/625 ,  H01M10/6571 ,  H01M10/637

Abstract: The present disclosure discloses a power battery heating method and device for an electric vehicle and a vehicle. The method 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, during control of the driving motor to drive the electric vehicle into operation according to the power demand information by the motor controller, 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. According to the present disclosure, the high-frequency oscillation current outputted by the driving motor is increased to satisfy a self-heating demand of the power battery while it is ensured that the power demand information is satisfied, thereby improving the heating rate and efficiency.

公开(公告)号：EP4148439A1

公开(公告)日：2023-03-15

申请号：EP21832528.0

申请日：2021-06-28

Applicant: BYD Company Limited

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

IPC: G01R31/36

Abstract: The present disclosure provides a method for calculating a cell state, a computer storage medium, and an apparatus for calculating a cell state, and relates to the technical field of vehicles. The method 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：EP4024652A1

公开(公告)日：2022-07-06

申请号：EP20868885.3

申请日：2020-09-24

Applicant: BYD Company Limited

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

IPC: H02J7/00

Abstract: A step-varying equalization method, a device, a medium, a battery pack, and a vehicle are provided. The method includes: initiating coarse-tuning equalization for a cell in the series-connected battery when an initial equalization difference of the cell reaches a preset coarse-tuning requirement; determining a first state of charge (SOC) equalization difference according to a first voltage value of the cell after completion of the coarse-tuning equalization when a first real equalization difference of the cell after the coarse-tuning equalization reaches a preset fine-tuning requirement, and initiating fine-tuning equalization for the cell with a first equalization step size based on the first SOC equalization difference; and determining that SOC equalization of the cell is completed when a second real equalization difference of the cell after completion of the fine-tuning equalization is less than or equal to a target equalization value.

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.