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Detection circuit, method and device

A technology for detecting circuits and voltages, which can be applied to electrical devices, measuring devices, measuring electricity, etc., and can solve the problems of not effectively improving the safety and reliability of high-voltage power battery systems.

Inactive Publication Date: 2018-10-09
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the safety and reliability of the high-voltage power battery system cannot be effectively improved

Method used

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  • Detection circuit, method and device
  • Detection circuit, method and device
  • Detection circuit, method and device

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Embodiment Construction

[0030] If the relay in the battery management system fails, it will affect the normal operation of the battery management system, which is not conducive to the safety of the high-voltage power battery system. In order to improve the safety of a high-voltage power battery management system, the present application provides a detection circuit. The basic principle is: the detection circuit may include a switching conversion unit. The switch conversion unit can make the collection control unit collect the voltage V1 between the first end of the relay and the second end of the battery pack within the first time length, and make the collection control unit collect the voltage V1 between the second end of the relay and the battery pack within the second time length. The voltage V2 between the second terminals of the group, so that the acquisition control unit can judge whether the relay is faulty according to V1 and V2. In this way, it is possible to independently detect the failur...

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Abstract

The invention discloses a detection circuit, method and device applied to a battery management system, relates to the field of electric automobile, and aims at improving the safety and reliability ofthe high-voltage power battery management system. The detection circuit comprises a switch conversion unit and a collection control unit. The first end of the switch conversion unit is connected withthe third end of the same in a first period, and the second end of the switch conversion unit is connected with the third end of the same in a second period. The collection control unit collects a voltage V1 between the first end of a relay and the second end of a battery pack in the first period, collects a voltage V2 between the second end of the relay and the second end of the battery pack in the second period, and determines whether the relay has a fault according to the V1 and V2.

Description

technical field [0001] The present application relates to the field of electric vehicles, in particular to a detection circuit, method and device. Background technique [0002] The high-voltage power battery system plays a key role in ensuring vehicle safety. The battery management system may include high voltage relays. Among them, the high-voltage relay can be used as a safety switch to disconnect when the voltage is greater than a preset threshold, so as to ensure the safety of the circuit and the battery management system. Since the high-voltage relay is prone to failure, the battery management system needs to detect the high-voltage relay from time to time to report to the high-voltage power battery system in time when the high-voltage relay fails, so that the high-voltage power battery system can deal with the failed high-voltage relay in time, thereby improving the high-voltage Safety and reliability of power battery system. [0003] High-voltage relays can include...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
CPCG01R31/3278G01R15/04B60L3/0046G01R19/10
Inventor 王文成吕杨高挺
Owner HUAWEI TECH CO LTD