Battery management system and detection method thereof

Abstract

The invention discloses a battery management system and a detection method thereof. The system comprises a controller, a plurality of master-slave modules connected in series, a current sensor connected with the controller, a plurality of battery management modules connected in series, a plurality of external connectors and a plurality of internal connectors, wherein the current sensor is used forcollecting a current of the master-slave modules; the adjacent master-slave modules are connected through the external connector, and a master module and a slave module in each master-slave module are connected through the internal connector; for each battery management module, the battery management module is used for managing corresponding master-slave modules and external connectors connectedwith the master-slave modules; and the controller is used for judging whether the plurality of external connectors have faults or not based on the sampling data and the currents of the plurality of external connectors when the currents are not zero, and judging whether the plurality of internal connectors have faults or not based on the sampling data and the currents of the plurality of battery cells in the plurality of master-slave modules. According to the embodiment of the invention, fault detection of the inter-module connector is realized.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a battery management system and a detection method thereof. Background technique [0002] In the battery management system, the connection mode between battery modules can be a master-slave connection mode, which is called a master-slave module. The master-slave module usually adopts the mode of one master and one slave. The master control board is located on the master module, and the slave module has no control board. The master module and the slave modules are connected through connectors and cascading wire harnesses. The battery management system may include multiple master-slave modules connected in series, and two adjacent master-slave modules are also connected through connectors and cascading harnesses. [0003] As the service time of the battery management system increases, components such as the connectors between the master module and the slave modules and the connectors be...

AI Technical Summary

Problems solved by technology

The failure of the connector will lead to inaccurate cell voltage collected by the battery management system and the safety risk of the entire vehicle.

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