Battery management system and balanced state online monitoring method thereof

Abstract

The invention discloses a battery management system and a balanced state online monitoring method thereof. The battery management system comprises a micro-control unit, a battery voltage detection circuit controlled by the micro-control unit, a battery voltage balancing circuit controlled by the micro-control unit and a battery. The battery management system has the remarkable advantages of being capable being supported to be a large current balancing system; reducing the effect of balancing current on the voltage detection accuracy; being capable of completely separating voltage detection and battery balancing by aid of the framework design mode that single harness and dual channels are adopted for balancing harnesses and voltage detection harnesses which do not affect each other functionally, and meanwhile, not affecting complexity of system harness distribution due to the fact that the single harness and dual channel design is adopted for the harnesses and the quantity of the harnesses is as same as that of the original harnesses performing balancing by aid of the voltage detection harnesses; and being capable of monitoring balancing circuit impedance in real time and accordingly finding whether the balancing harnesses are opened or damaged timely.

Description

technical field [0001] The invention relates to the field of battery management systems. Background technique [0002] The power battery system or energy storage battery system is generally equipped with a battery management system, and in order to meet the consistent application requirements of the battery system, it is required to add a balance system. However, due to the addition of the equalization system, there is a contradiction between the real-time performance and effectiveness of battery cell voltage monitoring. Specifically, most semiconductor manufacturers integrate the single cell voltage detection and equalization control circuit into an integrated design. In order to solve the problem that the equalization process cannot accurately measure the single cell voltage, they generally temporarily suspend the equalization control circuit during the measurement of the battery voltage corresponding to the number of cells. , after the monomer voltage collection is compl...

AI Technical Summary

Problems solved by technology

However, this method leads to new problems. If the equalization current is large, when the equalization circuit starts to work, the voltage of the voltage detection circuit cannot truly reflect the battery voltage due to the resistance of the voltage acquisition wiring harness and the connection impedance of the connection terminals when the equalization circuit starts to work. Potential safety hazards of overcharging or overdischarging, and the effect of equalization is not ideal

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