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

A technology of electric vehicles and combined devices, which is applied in the direction of electric vehicles, battery circuit devices, circuit devices, etc., can solve the problems of poor safety performance, insufficient capacity of low-voltage and high-current battery packs, etc., and achieve convenient counterweight, flexible and diverse combination methods, The effect of low operating voltage

Active Publication Date: 2013-06-26
QINGDAO VECCON ELECTRIC
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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

Method used

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

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Embodiment Construction

[0023] specific implementation plan

[0024] The present invention is described in detail below in conjunction with accompanying drawing;

[0025] Due to the limited capacity and voltage of single-cell lithium batteries, to form a large-capacity battery pack with a certain voltage, there must be a series and parallel operation of single-cell batteries. However, due to the consistency of single-cell batteries, too many single-cell batteries cannot be connected in parallel, otherwise the consistency of the batteries in the battery pack will vary greatly, and the performance of the battery will be greatly affected.

[0026] The battery pack described in the low-voltage high-current lithium battery pack of an electric vehicle is composed of several battery cells connected in series, and the battery cell is composed of several single-cell lithium batteries connected in parallel, and multiple battery packs are connected in series to form a battery pack branch circuit. The battery p...

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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...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/42H01M10/44
CPCY02E60/10
Inventor 刘广敏乔昕贺冬梅侯恩广李杨崔立志王知学李小伟
Owner QINGDAO VECCON ELECTRIC
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