Electric vehicle low-voltage high-current battery pack combination device and control method

Abstract

The invention particularly discloses an electric vehicle low-voltage high-current battery pack combination device and a control method. A plurality of single-cell lithium batteries are parallelly connected and serially connected to form a certain-voltage certain-capacity battery pack, the plurality of battery packs integrating with a battery monitor are serially connected to form a low-voltage certain-capacity battery pack branch, and the battery pack branches are parallelly connected to form a low-voltage high-current lithium battery assembly. The combination means is flexible, and the requirements of lithium batteries with various voltages and capacities can be met. A control device for the lithium battery pack combination device is capable of controlling an IGBT (insulated gate bipolar transistor) switch to charge and discharge in different ways according to the current states of the bather pack branches, the battery pack branches can operate in an optimal operation area to the maximum extent, the service life of each battery is prolonged as far as possible, the battery assembly is guaranteed to operate in the safe operation area, and the requirements of electric vehicles for power supply are also met.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a low-voltage and high-current battery pack assembly device and a control method for electric vehicles. Background technique [0002] China has become the largest automobile market in the world. It is estimated that by 2020, the number of automobiles in China will reach about 200 million, and the consumption of vehicle fuel will reach about 300 million tons. The Chinese automobile industry must seek new alternative energy sources. Lithium batteries have the advantages of high energy storage density, long service life, strong temperature adaptability, safe use, and environmental protection. The automotive industry has begun to use lithium batteries as battery solutions for electric vehicles. Generally, the battery voltage required for small / medium hybrid electric vehicles is between 60V and 200V. The motor drive system of an electric vehicle requires a battery with a large capaci...

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Problems solved by technology

[0004] Aiming at the problems of poor safety performance of high-voltage and low-current battery packs of electric vehicle lithium battery packs and insufficient capacity of low-voltage high-current battery packs, the present invention designs a low-voltage high-current lithium battery with flexible adjustment of current capacity and parallel connection of multiple battery pack branches. Group combination device and control method

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