Hardware Design And Verification Of New Energy Vehicle Battery Management System

With the advancement of electric vehicle technology and the increasing awareness of lowcarbon and environmental protection,electric vehicles have gradually entered people's lives with many advantages,which has greatly facilitated our travel and greatly reduced the environmental impact.The various pollutions received strong promotion from the state.At present,China is stepping up efforts to promote the development of new energy vehicles,causing positive reactions in the society,and all walks of life are competing to join the field of electric vehicle research and development.At present,the electric vehicle industry has entered a period of rapid growth,and electric vehicles account for an increasing proportion of the total annual automobile sales.The development of electric vehicles not only brings new economic growth points,but also enhances the protection effect of environmental protection.It also promotes the development of many electric vehicle parts,especially in order to match the development of fast-changing power batteries,battery management systems(The technology of BMS)is also advancing by leaps and bounds.As an indispensable part of electric vehicles,battery management system can greatly improve the cruising range of electric vehicles and the service life of batteries through reasonable and effective management of automobile power batteries,reducing the cost of using electric vehicles.This paper mainly introduces the system hardware design of the battery management system.In this design,the master-slave distributed structure is adopted.The system consists of a host module responsible for battery task processing and a plurality of slave modules responsible for single-cell battery information collection.The host and slave modules communicate information and tasks through the CAN bus,and each acquisition board is allocated independently.CAN bus address.The solution mentioned in this paper uses the LTC6804 battery monitoring chip.The acquisition module can realize single-cell voltage acquisition with very low error.The high-voltage module hardware circuit uses high-precision voltage divider resistors with 16-bit AD conversion precision to collect the total voltage.This AD acquisition chip is then used to achieve the total current acquisition.The hardware design fully considers the anti-interference performance to ensure the system is stable and reliable.The battery management system must achieve stable and reliable operation.After the development is completed,reasonable design verification is also required.According to the battery management system's working conditions on the actual vehicle,including the installation location and protection level.The comprehensive verification of our design from three aspects of electrical performance,EMC performance and environmental reliability ensures that the battery management system can withstand the harsh environment experienced by the actual vehicle.