公开(公告)号：US20230294541A1

公开(公告)日：2023-09-21

申请号：US18325103

申请日：2023-05-29

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Shan HUANG ,  Shichao LI ,  Haili LI ,  Wei ZHAO ,  Zhen LIN

IPC: B60L53/62 ,  H02J7/00 ,  B60L53/66

CPC classification number: B60L53/62 ,  H02J7/007194 ,  H02J7/007182 ,  H02J7/005 ,  B60L53/66 ,  B60L2240/545

Abstract: A method for charging a traction battery applied to a battery management system (BMS) for the traction battery, includes obtaining a temperature and a battery parameter of the traction battery, determining a parameter threshold based on the temperature of the traction battery, and during a charging process of the traction battery, controlling the traction battery to discharge or stop being charged in response to the battery parameter of the traction battery being greater than or equal to the parameter threshold and the battery parameter of the traction battery changing by a parameter gap value. The battery parameter includes at least one of a state of charge (SOC) or an open-circuit voltage (OCV).

公开(公告)号：US20230204674A1

公开(公告)日：2023-06-29

申请号：US18170412

申请日：2023-02-16

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jian RUAN ,  Mingshu DU ,  Shenzhi TANG ,  Shichao LI ,  Yanhua LU ,  Wei ZHANG

IPC: G01R31/387 ,  H02J7/00 ,  G01R31/36 ,  H01M10/42 ,  H01M10/48

CPC classification number: G01R31/387 ,  H02J7/0048 ,  G01R31/3648 ,  H01M10/425 ,  H01M10/48 ,  H01M2010/4278

Abstract: A method and device for determining an available capacity of a battery, a battery management system, and a storage medium, relating to the field of battery technologies. The method includes: obtaining the at least one DOD interval corresponding to the SOC interval of the operation of the battery, and the number of cycles and the cycle temperature corresponding to the at least one DOD interval; obtaining a recoverable amount of capacity fade of the battery according to the at least one DOD interval, the number of cycles and the cycle temperature, and determining an actual available capacity of the battery.

公开(公告)号：US20230095453A1

公开(公告)日：2023-03-30

申请号：US17053151

申请日：2020-06-17

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Mingshu DU ,  Shichao LI ,  Shenzhi TANG ,  Jian RUAN ,  Yanhua LU ,  Wei ZHANG

IPC: G01R31/3842 ,  G01R19/165 ,  G01R31/367

Abstract: Provided is a method and an apparatus for determining a state of charge of a battery, a battery management system and a storage medium, and relates to the field of battery technologies, where the method includes: obtaining a current OCV value of a battery and cumulative continuous charging or discharging capacity information of the battery; obtaining SOC credible information based on the current OCV value and the cumulative continuous charging or discharging capacity information; obtaining a corrected SOC value corresponding to the current OCV value according to the SOC credible information. According to the present disclosure, accuracy of SOC correction could be improved by determining the SOC credible information under the current OCV; for batteries, especially those with a hysteresis characteristic, accuracy of SOC estimation could be improved, an error of SOC estimation could be reduced and reliability of battery and experience of users could be improved.

公开(公告)号：US20210116512A1

公开(公告)日：2021-04-22

申请号：US17134253

申请日：2020-12-25

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Mingshu DU ,  Shichao LI ,  Shenzhi TANG ,  Li TAN ,  Yanhua LU ,  Wei ZHANG

IPC: G01R31/367 ,  H02J7/00 ,  G01R31/3842

Abstract: The present application provides a method and apparatus for correcting a state of charge. The method for correcting a state of charge comprises: determining an operating state of a battery cell, wherein the operating state comprises a discharging state or a charging state; and determining a corrected state of charge of the battery cell according to an acquired current open circuit voltage of the battery cell, an acquired current accumulative capacity of the battery cell, an accumulative capacity correspondence relationship corresponding to the operating state of the battery cell, and an open circuit voltage curve corresponding to a limit initial state of charge, wherein the accumulative capacity correspondence relationship comprises a correspondence relationship between a pre-measured open circuit voltage and an accumulative capacity threshold. A technical solution of the present application can be used to improve the accuracy of calculation of a state of charge.

公开(公告)号：US20230031352A1

公开(公告)日：2023-02-02

申请号：US17563513

申请日：2021-12-28

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yu YAN ,  Xiyang ZUO ,  Zhimin DAN ,  Haili LI ,  Shan HUANG ,  Shichao LI

IPC: H02J7/00 ,  B60L50/60 ,  B60L58/12 ,  H01M10/42

Abstract: Embodiments of the application provide a method for charging battery a charging and discharging device, which can ensure the safety performance of the battery. The charging and discharging device includes a first DC/DC converter, a unidirectional AC/DC converter and a control unit, where the first DC/DC converter is a unidirectional DC/DC converter, and the control unit is configured to: receive a first charging current and control the unidirectional AC/DC converter and the first DC/DC converter to charge a battery through an AC power source based on the first charging current; receive a first discharging current, and control the battery to release power based on the first discharging current; and receive a second charging current, and control the unidirectional AC/DC converter and the first DC/DC converter to charge the battery through the AC power source based on the second charging current.

公开(公告)号：US20220285958A1

公开(公告)日：2022-09-08

申请号：US17825714

申请日：2022-05-26

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Guangyu XU ,  Shichao LI ,  Wei ZHAO

IPC: H02J7/00 ,  G01R31/396 ,  G01R31/367 ,  G01R31/392 ,  G01R31/382

Abstract: This application provides a method and device for estimating a SOC of a battery pack, and a battery management system. The battery pack includes a first cell without a plateau and a second cell with a plateau. At least one first cell is serially connected to the second cell. The method includes: determining a capacity variation of the battery pack based on a SOC variation of the first cell in comparison with an initial SOC of the first cell, and based on a nominal capacity of the first cell; obtaining an equalization capacity of the first cell and an equalization capacity of the second cell; and estimating a SOC of the second cell, and determining the SOC of the battery pack based on the SOC of the second cell.

公开(公告)号：US20220209547A1

公开(公告)日：2022-06-30

申请号：US17488410

申请日：2021-09-29

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Lei PENG ,  Guangyu XU ,  Shichang ZHANG ,  Shichao LI

IPC: H02J7/00 ,  H01M10/42 ,  H01M50/51

Abstract: This application embodiment provides a method for equalizing the battery module, an apparatus, a battery module and a power management controller, including: judging whether the first battery core and the second battery core enter their respective fully-charged interval; if the first battery core enters and the second battery core doesn't enter, discharging the first battery core until the second battery core enters; if the first battery core doesn't enter and the second battery core enters, judging whether the maximum value of the first charging voltage of each battery cell in the first battery core is greater than a third preset value; if so, discharging the second battery core until the first battery core enters; if not, controlling both to rest a preset time; after resting for the preset time, discharging the first battery core and the second battery core until the SOC of each battery cell enters a same state.

公开(公告)号：US20210208200A1

公开(公告)日：2021-07-08

申请号：US17210010

申请日：2021-03-23

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Mingshu DU ,  Shichao LI ,  Shenzhi TANG ,  Li TAN ,  Yanhua LU ,  Wei ZHANG

IPC: G01R31/367 ,  H02J7/00 ,  G01R31/3842

Abstract: The present application provides a method and apparatus for correcting a state of charge. The method for correcting a state of charge comprises: determining an operating state of a battery cell, wherein the operating state comprises a discharging state or a charging state; and determining a corrected state of charge of the battery cell according to an acquired current open circuit voltage of the battery cell, an acquired current accumulative capacity of the battery cell, an accumulative capacity correspondence relationship corresponding to the operating state of the battery cell, and an open circuit voltage curve corresponding to a limit initial state of charge, wherein the accumulative capacity correspondence relationship comprises a correspondence relationship between a pre-measured open circuit voltage and an accumulative capacity threshold. A technical solution of the present application can be used to improve the accuracy of calculation of a state of charge.

公开(公告)号：US20210116513A1

公开(公告)日：2021-04-22

申请号：US17135179

申请日：2020-12-28

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Mingshu DU ,  Shichao LI ,  Jian RUAN ,  Shenzhi TANG ,  Yanhua LU ,  Wei ZHANG

IPC: G01R31/392 ,  G01R31/3842 ,  H02J7/00 ,  H01M10/42

Abstract: This application discloses a method for correcting a SOH, an apparatus, a battery management system and a storage medium, where the method includes: obtaining a relationship curve between a ratio of an accumulated charge/discharge capacity variation and a corresponding voltage-parameter variation of a battery cell and a voltage parameter itself; determining a valid peak point on the relationship curve; determining a SOH calibration value corresponding to voltage parameter datum at the valid peak point; correcting a current SOH according to the SOH calibration value. The estimation accuracy of the SOH can be improved according to this application.

公开(公告)号：US20210083484A1

公开(公告)日：2021-03-18

申请号：US17106239

申请日：2020-11-30

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Shichao LI ,  Mingshu DU ,  Shenzhi TANG ,  Jian RUAN ,  Yanhua LU ,  Wei ZHANG

IPC: H02J7/00

Abstract: The present application discloses a method, apparatus, device and medium for equalization control of battery packs. The method may include: acquiring a voltage of each of a plurality of cells of the battery pack; on the condition that one or more voltages of the voltages of the plurality of cells are within a preset voltage interval, selecting a target State of Charge (SOC)-Open Circuit Voltage (OCV) curve from a charging SOC-OCV curve and a discharging SOC-OCV curve stored for the battery pack based on the voltages within the preset voltage interval; acquiring a target SOC of each cell based on the target SOC-OCV curve and the voltage of each cell; calculating, for each cell, a SOC difference between the target SOC of the cell and a reference SOC; calculating an equalizing time for each cell based on the SOC difference of each cell.