公开(公告)号：US11329866B2

公开(公告)日：2022-05-10

申请号：US17155109

申请日：2021-01-22

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhimin Dan ,  Wenbin Lu ,  Wei Zhang ,  Yizhen Hou ,  Jia Xu ,  Jiechao Luo ,  Teng Yu

IPC: H04L12/24 ,  H04L41/0668 ,  H04B1/713

Abstract: The present disclosure provides a battery management system and a communication method. The method includes: determining, by a main BMU, from a plurality of managed units a fault unit that communicates abnormally with the main BMU, and transmitting, by the main BMU, to a backup BMU a fault frequency at which the fault unit communicates abnormally with the main BMU; selecting, by the backup BMU, from the managed units a managed unit that communicates normally with the backup BMU and the fault unit as a target unit; transmitting, by the backup BMU, frequency-conversion information to the fault unit through the target unit based on the fault frequency; converting, by the fault unit, its frequency to a frequency; transmitting the frequency to the main BMU if the backup BMU communicates normally with the fault unit using the frequency; and communicating, by the main BMU, with the fault unit using the frequency.

公开(公告)号：US10996251B2

公开(公告)日：2021-05-04

申请号：US16233620

申请日：2018-12-27

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhimin Dan ,  Yizhen Hou ,  Weiping Sun ,  Meng Li ,  Wei Zhang ,  Teng Yu

IPC: G01R27/20 ,  H01H47/00 ,  H01M10/42 ,  B60L50/60 ,  B60L3/00 ,  B60L3/12 ,  G01R31/327 ,  G01R31/00

Abstract: Provided is a method and device for obtaining internal side and external side insulation resistances of a relay. The method includes steps of controlling the insulation resistance obtaining circuit to output a low-frequency AC signal; when both the main relay and the pre-charge relay are switched off, obtaining an internal side insulation resistance of the main relay according to the low-frequency AC signal; if the internal side insulation resistance of the main relay is normal, controlling the pre-charge relay to be switched on; and when the main relay is switched off and the pre-charge relay is switched on, obtaining an external side insulation resistance value of the main relay according to the low-frequency AC signal.

公开(公告)号：US10938628B2

公开(公告)日：2021-03-02

申请号：US16540402

申请日：2019-08-14

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhimin Dan ,  Wenbin Lu ,  Wei Zhang ,  Yizhen Hou ,  Jia Xu ,  Jiechao Luo ,  Teng Yu

IPC: H04L12/24 ,  H04B1/713

Abstract: The present disclosure provides a battery management system and a communication method. The method includes: determining, by a main BMU, from a plurality of managed units a fault unit that communicates abnormally with the main BMU, and transmitting, by the main BMU, to a backup BMU a fault frequency at which the fault unit communicates abnormally with the main BMU; selecting, by the backup BMU, from the managed units a managed unit that communicates normally with the backup BMU and the fault unit as a target unit; transmitting, by the backup BMU, frequency-conversion information to the fault unit through the target unit based on the fault frequency; converting, by the fault unit, its frequency to a frequency; transmitting the frequency to the main BMU if the backup BMU communicates normally with the fault unit using the frequency; and communicating, by the main BMU, with the fault unit using the frequency.

公开(公告)号：US11251630B2

公开(公告)日：2022-02-15

申请号：US16559645

申请日：2019-09-04

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Wei Zhang ,  Zhimin Dan ,  Yizhen Hou ,  Jia Xu ,  Jiechao Luo ,  Wenbin Lu ,  Teng Yu

IPC: H02J7/00 ,  G01R31/382 ,  G01R31/396 ,  H01M10/42

Abstract: The battery management system comprises: a battery management unit, configured to receive status information of a battery module and status information of a battery pack, and transmit a control instruction to cell measurement circuits; the cell measurement circuits, configured to collect the status information of the battery module, transmit the status information of the battery module to the battery management unit, receive and execute the control instruction transmitted from the battery management unit; sensing units, configured to collect the status information of the battery pack, and transmit the status information of the battery pack to the battery management unit; wherein a wireless communication unit is disposed in the battery management unit, and a wireless communication unit is disposed in at least a portion of the cell measurement circuits and/or at least a portion of the sensing units.

公开(公告)号：US11102651B2

公开(公告)日：2021-08-24

申请号：US16555020

申请日：2019-08-29

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Wenbin Lu ,  Zhimin Dan ,  Yizhen Hou ,  Wei Zhang ,  Jia Xu ,  Jiechao Luo ,  Teng Yu

IPC: H04L9/08 ,  H04W12/06 ,  H04L9/30 ,  H04L9/14 ,  H04L29/06 ,  H04W12/033 ,  H04W12/041 ,  H04W12/71 ,  H04W12/0471 ,  H04L9/32

Abstract: The embodiments of the present disclosure disclose a method for data transmission, comprising: authenticating, by a target node in a battery management system, a source node in response to a request for data transmission from the source node; selecting, by the target node, any two prime numbers from a pre-stored set of prime numbers if the authentication is passed, generating a public key and a private key according to the two prime numbers, and transmitting the public key to the source node; performing, by the source node, a first encryption byte-by-byte for source data to be transmitted using the public key, performing a second encryption for the first encrypted data using a first encryption algorithm stored by the source node itself, and transmitting the second encrypted data to the target node.

公开(公告)号：US10895593B2

公开(公告)日：2021-01-19

申请号：US16233095

申请日：2018-12-27

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Wei Zhang ,  Zhimin Dan ,  Yizhen Hou ,  Meng Li ,  Weiping Sun ,  Teng Yu

IPC: G01R31/12 ,  G01R31/3835 ,  G01R27/02 ,  G01R31/00 ,  G01R31/50 ,  G01R31/389

Abstract: The present disclosure provides a parameter selection method, apparatus, and computer readable storage medium for an insulation detection circuit. The parameter selection method includes determining an allowable injection frequency range of an AC signal to be injected, according to a predetermined resistance range of an insulation resistance of the power battery under test and a predetermined resistance calculation cycle of the insulation resistance; and selecting an output frequency of the signal generation module according to a lowest frequency to be generated by the signal generation module and the allowable injection frequency range.

公开(公告)号：US11309598B2

公开(公告)日：2022-04-19

申请号：US16233096

申请日：2018-12-27

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhimin Dan ,  Wenbin Lu ,  Wei Zhang ,  Yizhen Hou ,  Teng Yu ,  Xiyang Zuo ,  Xingyuan Wu ,  Taosheng Zhu

IPC: H01M10/615 ,  H01M10/651 ,  H01M10/6571 ,  H01M10/42 ,  G01R31/382 ,  G01R19/165

Abstract: The present disclosure provides a heating control method and a heating control device. The heating control method includes: acquiring an average current value in a heating circuit of a power battery pack; calculating a current output value required for nth cycle according to an average current value of the nth cycle, an average current value of (n−1)th cycle, an average current value of (n−2)th cycle, a preset current value, n is equal to or greater than 3; outputting a PWM signal to a switch device of the heating circuit according to a pre-calibrated PWM control parameter corresponding to the current output value so that a difference between an actual current value in the heating circuit and the preset current value is less than a preset threshold.

公开(公告)号：US11249123B2

公开(公告)日：2022-02-15

申请号：US17134564

申请日：2020-12-28

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhimin Dan ,  Yizhen Hou ,  Weiping Sun ,  Meng Li ,  Wei Zhang ,  Teng Yu

IPC: G01R27/20 ,  H01H47/00 ,  H01M10/42 ,  B60L50/60 ,  B60L3/00 ,  B60L3/12 ,  G01R31/327 ,  G01R31/00

Abstract: Provided is a method and device for obtaining internal side and external side insulation resistances of a relay. The method includes: controlling an insulation resistance obtaining circuit to output an AC signal; when both a main relay and a pre-charge relay are switched off, obtaining a first phase shift of the AC signal between two sampling points according to first collected electrical signals; obtaining an internal side insulation resistance of the main relay according to the first collected electrical signals and the first phase shift; controlling the pre-charge relay to be switched on; when the main relay is switched off and the pre-charge relay is switched on, obtaining a second phase shift of the AC signal between the two sampling points according to second collected electrical signals; and obtaining an external side insulation resistance of the main relay according to the second collected electrical signals and the second phase shift.

公开(公告)号：US11146090B2

公开(公告)日：2021-10-12

申请号：US16539996

申请日：2019-08-13

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhimin Dan ,  Wenbin Lu ,  Wei Zhang ,  Yizhen Hou ,  Jia Xu ,  Jiechao Luo ,  Teng Yu

IPC: G01R31/08 ,  H04J1/00 ,  H04L12/16 ,  H02J7/00 ,  G01R31/389 ,  G01R31/3842 ,  G01R31/392 ,  H04W52/02

Abstract: The present disclosure provides a method for transmitting information in a battery management system. The method includes: determining, from a plurality of slave nodes, a fault slave node that communicates abnormally with a master node in the battery management system; selecting a target slave node from the plurality of slave nodes, wherein the target slave node is a slave node that communicates normally with both the master node and the fault slave node; transmitting frequency conversion information to the target slave node, so that the target slave node forwards the frequency conversion information to the fault slave node, and the fault slave node performs a frequency conversion based on the frequency conversion information; and transmitting information with the fault slave node using a frequency after the frequency conversion. According to embodiments of the present disclosure, the reliability of wireless communication in the battery management system can be improved.

公开(公告)号：US20210116486A1

公开(公告)日：2021-04-22

申请号：US17134564

申请日：2020-12-28

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Zhimin DAN ,  Yizhen Hou ,  Weiping Sun ,  Meng Li ,  Wei Zhang ,  Teng Yu

IPC: G01R27/20 ,  H01H47/00 ,  H01M10/42 ,  B60L50/60 ,  B60L3/00 ,  B60L3/12 ,  G01R31/327

Abstract: Provided is a method and device for obtaining internal side and external side insulation resistances of a relay. The method includes: controlling an insulation resistance obtaining circuit to output an AC signal; when both a main relay and a pre-charge relay are switched off, obtaining a first phase shift of the AC signal between two sampling points according to first collected electrical signals; obtaining an internal side insulation resistance of the main relay according to the first collected electrical signals and the first phase shift; controlling the pre-charge relay to be switched on; when the main relay is switched off and the pre-charge relay is switched on, obtaining a second phase shift of the AC signal between the two sampling points according to second collected electrical signals; and obtaining an external side insulation resistance of the main relay according to the second collected electrical signals and the second phase shift.