SOC detection and energy balancing system for drive power of pure electric urban bus, and method of the same

Abstract

The invention discloses a SOC (State of Charge) detection and energy balancing system for drive power of a pure electric urban bus, and a method of the same. A power supply system with two battery banks connected in parallel is used, single batteries in each battery bank and an integrating circuit composed of a resistor and a capacitor form a return circuit, the voltage of a capacitor end is taken as an input signal so as to comprehensively calculate a SOC value of the dual-battery bank power supply system, and energy of the single batteries with higher remaining capacity is controlled to flow towards the single batteries with lower remaining capacity according to the SOC detection result of the single batteries of each battery bank, thus, quick balance of battery energy is realized. The circuit structure is simple, the detection precision is high, the battery balancing process has no energy loss, and influence on SOC detection caused by transient variation of voltage of the single batteries when the electric vehicle accelerates or slows down suddenly in the course of driving is eliminated effectively.

Description

technical field [0001] The present invention relates to a SOC (SOC: battery state of charge) accurate detection and energy balance system for the vehicle-mounted power supply of pure electric buses, in particular to the voltage sampling, SOC detection circuit and detection method of multiple groups of power battery cells , Energy balance between battery cells and data communication based on CAN bus technology. Background technique [0002] Most of urban buses use oil as fuel. On the one hand, it has brought about an increase in the demand for global non-renewable energy oil, resulting in an increasing shortage of oil resources. On the other hand, it has brought about increasingly serious environmental pollution problems, making low-carbon The use of efficient new alternative energy has become inevitable. Pure electric buses use batteries as power, which have the characteristics of no pollution and high efficiency, and are increasingly valued. Pure electric buses use on-boa...

AI Technical Summary

Problems solved by technology

These three commonly used battery energy balance methods either cannot achieve dynamic energy balance during battery use, or use complex oscillating circuits to achieve energy balance, which inevitably brings the impact of AC components on the battery, or use energy consumption methods to achieve energy balance. achieve energy balance, so these methods have certain limitations

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