公开(公告)号：US11609276B2

公开(公告)日：2023-03-21

申请号：US16857135

申请日：2020-04-23

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jian Ruan ,  Mingshu Du ,  Shenzhi Tang ,  Shichao Li ,  Yanhua Lu ,  Wei Zhang

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

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：US11598811B2

公开(公告)日：2023-03-07

申请号：US17745921

申请日：2022-05-17

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jian Ruan ,  Mingshu Du ,  Shichao Li ,  Shenzhi Tang ,  Yanhua Lu ,  Wei Zhang

IPC: G01R31/36 ,  G01R31/396 ,  G01R31/388

Abstract: The present disclosure discloses a method for identifying a cell, including: determining, for a cell under test during a charge and discharge process, a number N of measured values of OCV and a number N of net cumulative throughputs corresponding to the number N of measured values of OCV; for an ith target cell, obtaining a number N of calculated values of OCV corresponding to the number N of measured values of OCV, and obtaining an OCV mean square error between the number N of measured values of OCV and the number N of calculated values of OCV; and determining that the cell under test is the ith target cell, when the OCV mean square error between the cell under test and the ith target cell is a minimum mean square error among a number M of OCV mean square errors.

公开(公告)号：US11047918B2

公开(公告)日：2021-06-29

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

Abstract: A method for correcting a SOH, an apparatus, a battery management system and a storage medium are provided. 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 method.

公开(公告)号：US12051934B2

公开(公告)日：2024-07-30

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

CPC classification number: H02J7/00714 ,  B60L50/60 ,  B60L58/12 ,  H01M10/425 ,  H02J7/0048 ,  B60L2210/10 ,  B60L2210/30 ,  H01M2010/4271

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：US11899071B2

公开(公告)日：2024-02-13

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 ,  G01R31/367 ,  G01R19/165

CPC classification number: G01R31/3842 ,  G01R19/1659 ,  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：US11870289B2

公开(公告)日：2024-01-09

申请号：US18327702

申请日：2023-06-01

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Shan Huang ,  Shichao Li ,  Haili Li ,  Wei Zhao ,  Zhen Lin

IPC: H02J7/00 ,  H01M10/44 ,  B60L58/13 ,  H01M10/42

CPC classification number: H02J7/0048 ,  B60L58/13 ,  H01M10/425 ,  H01M10/44 ,  H01M2010/4271 ,  H01M2220/20

Abstract: A method for charging a traction battery includes obtaining a battery parameter of the traction battery that includes a state of charge and/or an open-circuit voltage, 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 changing by a parameter gap value. The parameter gap value is a first preset parameter gap value in a scenario in which the battery parameter of the traction battery is in a first parameter interval, and is a second preset parameter gap value in a scenario in which the battery parameter of the traction battery is in a second parameter interval. The first preset parameter gap value is greater than the second preset parameter gap value, and the battery parameter in the first parameter interval is less than the battery parameter in the second parameter interval.

公开(公告)号：US11486934B2

公开(公告)日：2022-11-01

申请号：US16853289

申请日：2020-04-20

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Shenzhi Tang ,  Mingshu Du ,  Shichao Li ,  Jian Ruan

IPC: G01R31/3842 ,  B60L58/12 ,  G01R31/36 ,  H01M10/48

Abstract: A method, a device and a system for recovering recoverable faded capacity of a battery. The method includes determining the recoverable faded capacity of the battery, determining a corresponding lower limit of a battery parameter according to the recoverable faded capacity of the battery, and instructing a discharging device to discharge the battery to the corresponding lower limit of the battery parameter.

公开(公告)号：US11108247B2

公开(公告)日：2021-08-31

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.

公开(公告)号：US20210141028A1

公开(公告)日：2021-05-13

申请号：US17123001

申请日：2020-12-15

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Mingshu Du ,  Shichao Li ,  Shenzhi Tang ,  Yanhua Lu ,  Wei Zhang

IPC: G01R31/392 ,  H02J7/00 ,  G01R31/36

Abstract: This disclosure provides a method and an apparatus for correcting a state of health of a battery, a battery management system, and a storage medium, and relates to the field of battery technologies. The method includes: determining whether a current voltage value of a battery cell is within a correction OCV section of the battery cell; if yes, using the current voltage value of the battery cell as a correction voltage value; and acquiring an SOC correction value, and correcting a state of health (SOH) of the battery cell. According to the method, the apparatus, the battery management system, and the storage medium in this disclosure, reliability of an SOH correction result is improved, thereby providing accurate estimation of the state of health of the battery, a prolonged service life of the battery, and better user experience.

公开(公告)号：US20210119275A1

公开(公告)日：2021-04-22

申请号：US17138433

申请日：2020-12-30

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Mingshu DU ,  Shichao Li ,  Jian Ruan ,  Yizhen Hou ,  Yanhua Lu ,  Wei Zhang

IPC: H01M10/44 ,  H01M10/42 ,  H02J7/00

Abstract: Embodiments of the present invention relate to the field of circuit technology, and disclose a method for correcting a SOC of a battery pack, a battery management system, and a vehicle. The method for correcting an SOC of a battery includes: determining, when a charging process of the battery pack starts, whether an initial SOC value of the battery pack is less than or equal to a preset electricity quantity threshold; when the initial SOC value of the battery pack is less than or equal to the preset electricity quantity threshold, recording state information of the battery pack during the charging process, and generating a differential capacity curve of the battery pack according to the state information; correcting a current SOC value of the battery pack according to the differential capacity curve and a voltage-SOC reference curve of a non-decay zone of the battery pack.