Battery pack active-passive mixed equalization architecture and method thereof

Abstract

The invention provides a battery pack active-passive mixed equalization architecture and a method thereof and belongs to the field of electric vehicles. The equilibrium architecture comprises an active equalization module, a passive equalization module and a main control module. The active equalization module comprises a DC / DC converter, and a multiplexer MUX. The passive equalization module comprises a battery control chip, and n switching devices connected in series with n power resistors. The main control module is in the form of an MCU. The MCU judges whether the voltage of each battery cell reaches a charging / discharging cut-off voltage or not and the voltage consistency of all battery cells, and then selects corresponding equalization manners. When the voltage of one battery cell is larger than a preset threshold, one switching device connected with the above battery cell is controlled to conduct the shunting process (namely the passive equalization process). When the voltage of one battery cell is smaller than the preset threshold, one part of the energy of a battery pack is transferred to the above battery cell by means of the DC / DC converter (namely the active equalization process).

Description

technical field [0001] The invention belongs to the technical field of electric vehicle battery management, and in particular relates to an active-passive hybrid equalization architecture of a battery pack and a method thereof. Background technique [0002] Electric vehicles are an important development direction of the future automotive industry. Lithium batteries have the advantages of large specific energy and specific volume, high working voltage level, no memory effect, low self-discharge rate, and no pollution. Lithium batteries have gradually become the preferred power source for electric vehicles. The power battery module for electric vehicles is composed of single buried ion batteries connected in series. Due to the limitation of the battery manufacturing process, the characteristics of each single battery will have slight differences. When a large number of single batteries are used in groups, it will There is an imbalance problem with the battery pack. Once ther...

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