公开(公告)号：US11656289B2

公开(公告)日：2023-05-23

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

CPC classification number: G01R31/392 ,  G01R31/3648 ,  H02J7/005 ,  H02J7/0049

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：US20210148981A1

公开(公告)日：2021-05-20

申请号：US17138547

申请日：2020-12-30

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

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

IPC: G01R31/388 ,  G01R31/3842

Abstract: This disclosure provides a method and an apparatus for determining available energy of a battery, a battery management system, and a storage medium, and relates to the field of battery technologies. The method includes: obtaining a DOD interval corresponding to a current SOC interval of the battery, and a cycle quantity and a cycle temperature that correspond to the DOD interval; obtaining recoverable energy information of the battery based on the DOD interval, the cycle quantity, and the cycle temperature; and determining current remaining available energy of the battery based on the recoverable energy information. For a battery with a recoverable attenuation capacity, the method, the apparatus, the battery management system, and the storage medium in this disclosure could help improve accuracy in estimating remaining available energy of the battery, thereby improving battery reliability, prolonging a service life of the battery, and enhancing user experience.

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：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：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：US20180348304A1

公开(公告)日：2018-12-06

申请号：US15992371

申请日：2018-05-30

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Shenzhi Tang ,  Yanhua Lu

IPC: G01R31/36

CPC classification number: G01R31/3679 ,  G01R31/3658

Abstract: A method and apparatus for estimating a state of health of a battery pack and a computer-readable medium are provided, the method including: detecting changes of health indicators of every battery unit in the battery pack, determining whether the battery unit has a correction opportunity for a state of charge thereof during a predetermined period of time based on the detected changes of the health indicators, calculating corrected states of charge and one or more of cumulative changes in capacity between every two correction opportunities of a battery unit having two or more correction opportunities, obtaining a first estimated state of health of the battery unit having two or more correction opportunities based on the above data and estimating the state of health of the battery pack based on the first estimated state of health of the battery unit having two or more correction opportunities.