Battery management system

Abstract

The invention relates to a battery management system which comprises a vehicle-mounted battery management unit and a cloud calculation system based on battery historical data. The vehicle-mounted battery management unit conducts battery model parameter identification through voltage, current and temperature which are measured by a battery information acquisition unit, conducts state SOC and SOE estimation through identified parameters and achieves functions of multi-objective optimization charging and discharging capacity SOP estimation, battery short-circuit fault detection, sensor fault detection, sensor online calibration and battery self-heating and heat equilibrium and the like on the basis of model parameters. The characteristics that a cloud server is large in memory space and highin computing power are used for achieving online battery capacity estimation, namely the section of health SOH estimation, and battery pack consistency estimation and remaining mileage prediction areconducted through the model parameters and SOC information. The inner short-circuit condition of parameter slow time varying is estimated. The remaining useful life (RUL) is predicted through the historical charging data. Calculation results are transmitted back to the vehicle-mounted battery management unit through wireless transmission.

Description

Technical field [0001] The field of electric vehicle power batteries and energy storage batteries, especially involving a battery management system for electric vehicles Background technique [0002] The current battery management system is integrated on the vehicle hardware. Due to the limited computing power of the vehicle hardware, it is unable to implement large-scale complex and precise calculations, resulting in the current battery management system being incomplete. [0003] When the sensor fails, it will cause large noise fluctuations in the battery management system, often causing the divergence of model parameters; the current fault diagnosis function in battery management is single, only judging battery faults, and the method is simple, using only a few levels The system has a high false alarm rate, and when a sensor fails, it is easy to misjudge the fault type, making it impossible to distinguish between a battery failure and a sensor failure. Contents of the i...

AI Technical Summary

Problems solved by technology

[0002] The current battery management system is integrated on the vehicle hardware. Due to the limited computing power of the vehicle hardware, it is impossible to realize large-scale complex and fine calculations, resulting in the incomplete function of the current battery management system.

[0003] When the sensor fails, it will cause large noise fluctuations in the battery management system, which will often cause the divergence of model parameters; the fault diagnosis function in the current battery management is single, only for battery fault judgment, and the method is simple, only using several levels The fault level is judged, the false alarm rate of the system is high, and when the sensor fails, it is easy to cause a fault type judgment error, and it is impossible to distinguish between the battery fault and the sensor fault

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