Synchronous sampling method and system of battery management system

Abstract

The invention discloses a synchronous sampling method and system of a battery management system (BMS). The method and the system at least synchronously sample the voltage of all single batteries in the BMS for one time. A method for synchronously sampling the voltage of all single batteries in the BMS comprises steps of: setting the clock level of a master control end as a first level; setting the clock states of multiple sub controller ends as input states and monitoring a synchronous clock line; setting the clock level of the master control end as a second level; synchronously sampling, by using the multiple sub controllers, the voltage of the corresponding single batteries when the single batteries change from the first level to the second level; and feeding back, by using the multiple sub controllers, the voltage of the single batteries acquired by the multiple sub controllers to the master controller. The system is low in cost, easy to implement, just required to be provided with a synchronous clock wire harness without the need to change PACK configuration, completely eliminates influences of resistance and voltage change at the charging and discharging ends of the batteries, and is high in precision.

Description

technical field [0001] The invention relates to the field of battery management, in particular to a synchronous sampling method and a sampling system of a battery management system. Background technique [0002] With the development of economy, it also brings the negative impact of energy crisis and pollution. The development of pure electric vehicles has become the best way to solve this problem. The country has also invested a lot of manpower and material resources in the field of electric vehicles to solve the related problems and bottlenecks of constraints. A pure electric vehicle refers to a vehicle that uses the on-board power supply to provide power, drives the wheels with a motor, and meets the requirements of road traffic and safety regulations. [0003] Vehicle energy systems usually use lithium-ion battery systems. Lithium-ion batteries have many advantages, such as long service life, high specific energy, and flexible combination. However, due to its large ene...

AI Technical Summary

Problems solved by technology

If the two sub-controllers collect voltage at different times, the value of IP will also be quite different according to the driving conditions. Therefore, there will be relatively large measurement errors or even errors when measuring the state of the battery cell based on the maximum and minimum voltage values ​​of the entire PACK.

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