Battery pack capable of keeping running after partial fault battery units are automatically disengaged

Abstract

A battery pack capable of keeping running after partial fault battery units are automatically disengaged is characterized in that the battery pack comprises a battery management system BMS and a plurality of series units, the series units are connected in series, and each series unit is connected with the battery management system BMS; the negative end of the previous series unit 7 is connected with the positive end of the next series unit, the positive end of the uppermost series unit is the positive electrode of the battery pack, and the negative end of the lowermost series unit is the negative electrode of the battery pack; and the bypass switch driving circuit DRV and the battery parameter monitoring circuit SEN of each series unit (7) are respectively connected to a battery management system BMS, and when the battery parameter monitoring circuit SEN detects that the battery unit 9 in a certain series unit 7 works abnormally, the bypass switch K of the series unit 7 is switched into a closed state, the series unit fault battery unit is automatically disconnected from the system, the system current path is switched to the bypass switch K of the series unit 7, and the battery pack can keep running continuously.

Description

technical field [0001] The invention belongs to the field of new energy batteries, in particular to a battery pack that keeps running after automatically disengaging some faulty battery units. Background technique [0002] At present, lithium-ion batteries have been widely used in electric vehicles and other fields. [0003] The system voltage required by fields such as electric vehicles is usually as high as hundreds of volts, while the rated voltage of lithium-ion battery cells is generally below 5V, so a large number of battery cells need to be connected in series to increase the voltage to form a battery pack. For example, 100 lithium iron phosphate batteries with a rated voltage of 3.2V are connected in series to form a battery pack with a rated voltage of 320V. [0004] If the capacity (Ah) of the battery cells does not meet the design requirements of the battery pack, it is necessary to connect several battery cells in parallel to achieve a parallel block with a larg...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a battery pack that keeps running after disconnecting some faulty battery units automatically, which can overcome the disadvantage that the entire system cannot continue to operate after the existing battery failure. The system can still keep running, so as to strive for continuous operation time for electrical equipment before maintenance, and avoid sudden shutdown of the system or unsafe accidents caused by it

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