Intelligent charging equalization method and device of power battery for hybrid power vehicle and pure electric vehicle

Abstract

The invention relates to intelligent charging equalization method and device of a power battery for a hybrid power vehicle and a pure electric vehicle. The method comprises the following steps of: (1) controlling a charger to charge the power battery when forecasting that the equalized charging needs to be carried out on the power battery by using a power battery management system; (2) when charging the power battery by using the charger, collecting the single voltage of each single power battery by using the power battery management system until the single voltage of at least one single battery reaches the maximum value; and (3) controlling the charger to stop charging the power battery and controlling a charging equalizer to start to carry out singly equalized charging on each single battery until the battery is fully charged by using the power battery management system. The invention also provides a relevant device. The intelligent charging equalization method has the advantages of unique conception and ingenious design and can rapidly, effectively and conveniently realize equalized charging maintenance to the power battery; and the device has concise structure and is suitable for large-scale generalization and application.

Description

technical field [0001] The invention relates to the technical field of automotive power systems, in particular to the technical field of power batteries for hybrid and pure electric vehicles, and in particular to an intelligent charging equalization method and device for power batteries for hybrid and pure electric vehicles. Background technique [0002] Hybrid and pure electric vehicles have added key components such as high-voltage power battery systems, motors and motor controllers, and vehicle controllers on the basis of traditional vehicles. Among them, the high-voltage power battery system is composed of a battery management system, a thermal management system and several batteries connected in series. The performance of the high-voltage power battery system is related to the performance of the entire vehicle, while the performance of the high-voltage power battery is consistent with the performance , thermal management system, etc. [0003] The high-voltage power bat...

AI Technical Summary

Problems solved by technology

[0005] The existing battery equalization charging maintenance generally adopts the energy transfer method or the energy consumption method. The basic principle is that the battery management system detects the voltage of each battery cell. If the voltage difference between the battery cells exceeds the allowable range, the management system controls Relays or MOS tubes control the discharge resistance or capacitance to be connected to the battery cells that need to be balanced, so as to realize the energy consumption or transfer of the battery cells and achieve the purpose of battery cell equalization, but this battery cell equalization method High cost, consumes a certain amount of energy, and increases the difficulty of mechanical design and thermal management of the battery system

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