公开(公告)号：US11313908B2

公开(公告)日：2022-04-26

申请号：US16576368

申请日：2019-09-19

Applicant: Huawei Technologies Co., Ltd.

Inventor： Wencheng Wang ,  Yang Lv ,  Ting Gao

IPC: G01R31/327 ,  B60L3/00 ,  G01R19/10

Abstract: A detection circuit includes a switch conversion unit and a collection control unit. The switch conversion unit is configured to: enable a first end of the switch conversion unit to connect to a third end of the switch conversion unit within first duration, and enable a second end of the switch conversion unit to connect to the third end of the switch conversion unit within second duration. The collection control unit is configured to: collect a voltage (V1) between a first end of a relay and a second end of a battery pack within the first duration, collect a voltage (V2) between a second end of the relay and the second end of the battery pack within the second duration, and determine, based on V1 and V2, whether the relay is faulty.

公开(公告)号：US11243259B2

公开(公告)日：2022-02-08

申请号：US16673666

申请日：2019-11-04

Applicant: Huawei Technologies Co., Ltd.

Inventor： Wenping Tong ,  Kui Zhou ,  Wencheng Wang

IPC: G06F11/30 ,  G01R31/389 ,  G01R31/385 ,  G01R31/36

Abstract: An insulation resistance detection circuit, detection method, and detection apparatus are provided. The circuit includes an alternating-current signal source, a resonant cavity, a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch, and a second switch. The alternating-current signal source is sequentially connected to the first resistor, the resonant cavity, the first switch, the second resistor, and the third resistor in series to form a loop. The first resistor is connected to a positive electrode of the alternating-current signal source, and the third resistor is connected to a negative electrode of the alternating-current signal source. One end of the second switch is connected to a negative electrode of a to-be-detected battery, the other end of the second switch is connected to the fourth resistor, and the other end of the fourth resistor is connected to ground.

公开(公告)号：US20200011929A1

公开(公告)日：2020-01-09

申请号：US16576368

申请日：2019-09-19

Applicant: Huawei Technologies Co., Ltd.

Inventor： Wencheng Wang ,  Yang Lv ,  Ting Gao

IPC: G01R31/327 ,  B60L3/00 ,  G01R19/10

Abstract: A detection circuit includes a switch conversion unit and a collection control unit. The switch conversion unit is configured to: enable a first end of the switch conversion unit to connect to a third end of the switch conversion unit within first duration, and enable a second end of the switch conversion unit to connect to the third end of the switch conversion unit within second duration. The collection control unit is configured to: collect a voltage (V1) between a first end of a relay and a second end of a battery pack within the first duration, collect a voltage (V2) between a second end of the relay and the second end of the battery pack within the second duration, and determine, based on V1 and V2, whether the relay is faulty.

公开(公告)号：US10819123B2

公开(公告)日：2020-10-27

申请号：US15948612

申请日：2018-04-09

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yang Lv ,  Wencheng Wang ,  Zhijie Wang

IPC: H01M10/44 ,  H01M10/46 ,  H02J7/00 ,  B60L50/64

Abstract: Embodiments of the present disclosure provide a voltage collection circuit and a circuit control method. The voltage collection circuit includes a battery monitoring chip, n switch units, and a controller. The battery monitoring chip is connected to a battery module including k battery cells, a battery cell CELL(i) is any one of the k battery cells. A switch unit Ji is connected in parallel to the battery cell CELL(i), a switch unit Js is connected in parallel to voltage collection channels Cs and C(s−1). The battery monitoring chip is configured to collect voltages of the k battery cells by using n+1 voltage collection channels. The controller is connected to the battery monitoring chip and control ends of the n switch units and configured to control working statuses of the n switch units according to the voltages collected by using the n+1 voltage collection channels.