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：EP3767317A1

公开(公告)日：2021-01-20

申请号：EP19774341.2

申请日：2019-03-25

Applicant: BYD Company Limited

Inventor： DENG, Linwang ,  FENG, Tianyu ,  LV, Chun ,  LIN, Siqi ,  YANG, Zihua

IPC: G01R31/36

Abstract: This application discloses a method and an apparatus for calculating an SOH of a power battery pack, and an electric vehicle. The method includes the following steps: obtaining a charging curve of a cell of the power battery pack, and determining a current charging stage according to the charging curve, where the charging stage includes a high-voltage charging turning point and a high-voltage platform charging stage; obtaining a battery pack level corresponding to the high-voltage charging turning point and a battery pack level corresponding to the high-voltage platform charging stage; calculating a remaining capacity of the cell according to the battery pack level corresponding to the high-voltage charging turning point and the battery pack level corresponding to the high-voltage platform charging stage; and calculating an SOH of the cell according to the remaining capacity. According to the method of this application, convenience and accuracy of estimating the SOH of the power battery pack can be greatly improved.

公开(公告)号：EP3761475A1

公开(公告)日：2021-01-06

申请号：EP19777123.1

申请日：2019-03-25

Applicant: BYD Company Limited

Inventor： FENG, Tianyu ,  DENG, Linwang ,  LV, Chun ,  LIN, Siqi ,  YANG, Zihua

IPC: H02J7/00

Abstract: The present disclosure discloses a vehicle, and an equalization method and device for a power battery pack. The method includes the following steps: obtaining a high voltage turning point of a charging curve of a cell of the power battery pack, obtaining a capacity of the cell according to the high voltage turning point of the cell, and equalizing the cell according to the capacity of the cell. Therefore, equalization management of the power battery pack can be implemented, thereby improving utilization of the power battery pack and prolonging a service life of the power battery pack.

公开(公告)号：EP2371049A1

公开(公告)日：2011-10-05

申请号：EP10731061.7

申请日：2010-01-15

Applicant: BYD Company Limited

Inventor： DENG, Linwang ,  WU, Xuejian ,  ZHANG, Jianhua

IPC: H02J7/00

CPC classification number: H02J7/0052 ,  H02J7/045 ,  H02J7/047 ,  H02J2007/005

Abstract: A battery managing device, a method of using the same and a charging management method of a battery pack. The battery managing device comprises a single-chip (25) for determining a charging voltage and a charging current according to a remaining capacity of the battery pack and controlling a charging device coupled to the battery managing device to charge the battery pack with the charging voltage and the charging current determined by the single-chip (25).

公开(公告)号：EP4534342A1

公开(公告)日：2025-04-09

申请号：EP23814684.9

申请日：2023-03-06

Applicant: BYD Company Limited

Inventor： XIONG, Shi ,  FENG, Tianyu ,  DENG, Linwang

IPC: B60L58/18

Abstract: A battery circuit (100), comprising a power supply end (101), a first battery pack (102), a second battery pack (103), a voltage transformation unit (104), a first switch (105). a second switch (106) and a grounding end (107), wherein a positive electrode of the first battery pack (102) is connected to the power supply end (101), and a negative electrode thereof is connected to a positive electrode of the second battery pack (103); a negative electrode of the second battery pack (103) is connected to the grounding end (107); a first end of the first switch (105) is connected to the power supply end (101), and a second end thereof is connected to a first end of the second switch (106); a second end of the second switch (106) is connected to the grounding end (107); the voltage transformation unit (104) is connected between the negative electrode of the first battery pack (102) and the second end of the first switch (105); the deviation between a rated voltage of the first battery pack (102) and a rated voltage of the second battery pack (103) is less than a first preset range; and the deviation between the ratio of the capacity of the first battery pack (102) to the capacity of the second battery pack (103) and the ratio of the maximum discharge rate of the second battery pack (103) to the maximum discharge rate of the first battery pack (102) is less than a second preset range. Also disclosed is a vehicle comprising the battery circuit.

公开(公告)号：EP4470826A1

公开(公告)日：2024-12-04

申请号：EP23814786.2

申请日：2023-04-13

Applicant: BYD Company Limited

Inventor： DENG, Linwang ,  FENG, Tianyu ,  XIONG, Shi

IPC: B60L58/10 ,  H02J7/00 ,  H02M3/158

Abstract: A battery circuit, a control method for a battery circuit, and a vehicle. The battery circuit comprises: a power source end, a first battery pack, a second battery pack of a different type from the first battery pack, a voltage transformation unit, a first switch, a second switch and a ground end, wherein 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：EP4404327A1

公开(公告)日：2024-07-24

申请号：EP22913988.6

申请日：2022-11-30

Applicant: BYD Company Limited

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

IPC: H01M10/44

CPC classification number: B60L58/10 ,  H01M10/44 ,  H01M10/42

Abstract: Provided is a battery management method, including: obtaining a current high-voltage inflection point power value of each cell; obtaining a current historical cumulative balance power value of each cell (S 102); obtaining a current equivalent self-discharge value of each cell through calculation (S103); obtaining an equivalent self-discharge value at a previous moment of each cell (S 104); obtaining a target equivalent self-discharge value of each cell through calculation (S 105); determining a maximum target equivalent self-discharge value and a minimum target equivalent self-discharge value (S 106); obtaining a maximum equivalent self-discharge rate and a minimum equivalent self-discharge rate through calculation (S 107); 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 (S108). The present invention further provides a battery management apparatus, a vehicle, and a computer-readable storage medium.

公开(公告)号：EP4246163A1

公开(公告)日：2023-09-20

申请号：EP22778393.3

申请日：2022-02-17

Applicant: BYD Company Limited

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

IPC: G01R31/396 ,  G01R31/382

Abstract: The present disclosure relates to a method, apparatus, medium and device for determining a voltage inflection point of a cell core in a LFP battery. The method includes: charging the LFP battery with a first current value and monitoring the State of charge (SOC) of the LFP battery, the first current value being greater than a predetermined threshold of current; if the SOC of the LFP battery is outside a predetermined detection range, controlling and charging the LFP battery with the first current value; if the SOC of the LFP battery is within the detection range, controlling and charging the LFP battery with a second current value, the second current value being less than the predetermined threshold of current; and detecting the voltage inflection point of various cell cores in the LFP battery according to parameter information of the various cell cores in the LFP battery in the process of charging where the SOC of the LFP battery is within the detection range.