BMS multifunctional integrated high voltage monitoring system

Abstract

The invention discloses a BMS multifunctional integrated high voltage system monitoring scheme. The BMS multifunctional integrated high voltage system monitoring scheme comprises a high voltage collecting circuit, a high voltage processing circuit, a DC / DC isolation circuit and an SPI isolation circuit. The high voltage collecting circuit is used for collecting the total current of a battery packand the total voltage of inner and outer sides of the battery pack; the high voltage processing circuit is used for performing A / D conversion on a millivolt level voltage value collected by the high voltage collecting circuit; the DC / DC isolation circuit is used for providing an isolated stable voltage for an A / D chip and an SPI isolation chip; the SPI isolation circuit is used for reporting a calculated value of the A / D chip to an MCU through an isolated SPI bus, and an actual value is calculated by the MCU. By means of the BMS multifunctional integrated high voltage system monitoring scheme,the total voltage measurement (including measurement of the total voltage of the inner and outer sides of the battery pack), insulation monitoring and total current detection (using a shunt scheme) of a high-voltage power system of an electric vehicle can be performed effectively and simultaneously. The whole scheme has a simple circuit form, flexible design, high detection precision, fast circuit response speed and low cost.

Description

technical field [0001] The invention belongs to the technical field of battery management systems for electric vehicles, and in particular relates to a BMS multifunctional integrated high-voltage monitoring system. Background technique [0002] At present, an important feature of electric vehicles is that they are equipped with high-voltage battery packs that ensure sufficient power performance, and form a power circuit with high voltage and high current. The high-voltage battery pack is composed of multiple battery cells connected in series and parallel. Most of its working voltage is above 300V, and its normal working current can reach dozens or even hundreds of amperes, and the instantaneous short-circuit current is doubled. Especially when an insulation failure occurs in the high-voltage circuit, the high voltage and high current will endanger the personal safety of passengers in the vehicle, and will also affect the normal operation of low-voltage electrical appliances,...

AI Technical Summary

Problems solved by technology

Most of the above three functional modules are completed by independent solutions, and a small part integrates two functional modules. The circuit structure of the above solutions is complex and the cost is high.

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