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：US11978866B2

公开(公告)日：2024-05-07

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: H02J7/00 ,  H01M10/42 ,  H01M10/44 ,  B60L58/12 ,  B60L58/16

CPC classification number: H01M10/446 ,  H01M10/4257 ,  H02J7/0048 ,  B60L58/12 ,  B60L58/16 ,  H01M2010/4271

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.

公开(公告)号：US11936220B2

公开(公告)日：2024-03-19

申请号：US17562883

申请日：2021-12-27

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Chenling Zheng ,  Yanhua Lu ,  Jinbo Cai ,  Bingtuan Luo

IPC: H02J7/00 ,  H02J3/32

CPC classification number: H02J7/00304 ,  H02J3/32 ,  H02J7/0013 ,  H02J7/0031

Abstract: Embodiments of this application provide an energy storage device and system as well as a power system, and relate to the technical field of a power grid. The energy storage device includes: at least two parallel-connected energy storage units, where each energy storage unit includes: a battery cluster and a power conversion system; and the battery cluster includes at least two cells; a direct-current side of the power conversion system is electrically connected to the battery cluster, an alternating-current side of the power conversion system is configured to electrically connect to an input side of an alternating-current combiner cabinet, and an output side of the alternating-current combiner cabinet is configured to electrically connect to an alternating-current side of a transformer. The energy storage device is configured to improve safety and reliability of the energy storage system.

公开(公告)号：US11536772B2

公开(公告)日：2022-12-27

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 ,  G01R31/3842 ,  H02J7/00

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：US11366170B2

公开(公告)日：2022-06-21

申请号：US17076825

申请日：2020-10-22

Applicant: Contemporary Amperex Technology Co., Limited

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

IPC: H02J7/00 ,  G01R31/367 ,  G01R31/392 ,  G01R31/396 ,  G01R31/3842 ,  G01R31/36

Abstract: A method and apparatus for correcting a state of charge (SOC) is provided. The method includes: acquiring state data of a battery cell in a case where the battery cell meets a preset standing condition, wherein the state data includes: current and voltage data, the preset standing condition is that the current in the state data is less than a preset current threshold, wherein a length of the voltage data in the state data is greater than a preset length; calculating an estimated steady-state Open Circuit Voltage (OCV) value according to the state data, under a condition that a change value of the voltage data in the state data is greater than a preset change threshold; determining a SOC correction value corresponding to the estimated steady-state OCV value; and correcting a current SOC by using the SOC correction value corresponding to the estimated steady-state OCV value.

公开(公告)号：US10989759B1

公开(公告)日：2021-04-27

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：US11668755B2

公开(公告)日：2023-06-06

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: G01R31/367 ,  G01R31/36 ,  G01R31/382 ,  G01R31/388 ,  G01R31/3842 ,  G01R31/374

CPC classification number: G01R31/367 ,  G01R31/388 ,  G01R31/3648 ,  G01R31/374 ,  G01R31/382 ,  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：US11262406B2

公开(公告)日：2022-03-01

申请号：US16856642

申请日：2020-04-23

Applicant: Contemporary Amperex Technology Co., Limited

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

IPC: G01R31/367 ,  G01R31/392 ,  G01R31/396 ,  G01R31/3842 ,  G01R31/374 ,  G01R31/36 ,  H01M10/42

Abstract: A method and apparatus for correcting a state of charge (SOC), a battery management system and a storage medium are provided. The method includes: acquiring state data of a battery cell in a case where the battery cell meets a preset standing condition; determining, according to the state data of the battery cell, a near-steady-state battery model for characterizing a change in an open circuit voltage (OCV) over time in a near-steady-state and a steady-state time period threshold for characterizing whether a standing time period is sufficient; processing the steady-state time period threshold by using the near-steady-state battery model to obtain an estimated steady-state OCV value; determining a SOC corresponding to the estimated steady-state OCV value by using a preset correspondence between steady-state OCVs and SOCs; and correcting a current SOC by using the SOC corresponding to the estimated steady-state OCV value.