Power battery management system of electric vehicle

Abstract

The invention relates to a power battery management system of an electric vehicle. The power battery management system comprises a battery management system control board and a plurality of single battery information acquisition boards, wherein the battery management system control board and the single battery information acquisition boards are connected through RS232 buses for information interaction; the battery management system control board comprises an embedded processor, an RS232 communication module, a CAN bus communication module, a battery pack current acquisition module, a USB communication module, a touch screen human-computer interaction module, an Ethernet communication module, a battery balancing control module and an audible alarm module; and each single battery informationacquisition board comprises an embedded processor, a digital isolator, an RS232 communication module, a single battery voltage acquisition module and a single battery temperature acquisition module.The power battery management system of the electric vehicle is easy to mount and connect by virtue of the modular design. The accuracy of voltage and current acquisition is high and the estimation ofremaining battery power is accurate. The power battery management system of the electric vehicle has a battery balancing function to prevent the battery from being over-charged and over-discharged, and prolongs the service life of a power battery.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle energy management, and in particular relates to a management technology for electric vehicle power batteries. Background technique [0002] The power battery occupies an important position in the electric vehicle and is the power source of the electric vehicle. How to effectively use the energy of the battery to improve the mileage of the vehicle and prolong the life of the battery is the key issue of the battery management system. The performance of the power battery management system is crucial to the mileage, cost of use, energy saving and safety of electric vehicles. [0003] At present, more and more attention is paid to the research of battery management system at home and abroad, and there are more and more technologies. The technical characteristics of the existing battery management system are: the estimation accuracy of the state of charge is not enough. The balance between ba...

AI Technical Summary

Problems solved by technology

The technical characteristics of the existing battery management system are: the estimation accuracy of the state of charge is not enough

The balance between batteries mostly adopts an external independent balanced charging method, the wiring and operation are complicated, and it is impossible to realize high-current fast charging of electric vehicles, which is not conducive to the promotion of electric vehicles

A reasonable and feasible charging current cannot be determined according to the current state of charge value, which will easily cause the battery to be overcharged or unable to be fully charged, which is not conducive to prolonging the battery life

The battery management system lacks predictability for the detection and maintenance of the battery pack, and cannot predict the health status of the single cells in the battery pack, which is not conducive to the debugging and maintenance of the battery pack

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