Method and device for online diagnosis of battery short circuit fault

Abstract

The invention provides a method and a device for online diagnosis of a battery short circuit fault, and relates to the technical field of batteries. With the adoption of the diagnostic method providedby the embodiment of the invention, a current state of a battery cell can be determined, and the short circuit fault or a normal state of the battery cell can be judged. The diagnostic method requires a small amount of data and low calculation cost, and can quickly diagnose whether the short circuit fault occurs in any battery cell or one of the cells in a battery pack. The charging current and the discharging current used in the diagnosis process are small; charging and discharging are carried out in one direction, thereby realizing the diagnosis of the short circuit fault in the battery cell under a constant current condition.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method and device for online diagnosis of battery short-circuit faults. Background technique [0002] During the use of batteries, such as battery modules in solar street lamps, battery modules in energy storage power stations, battery modules in electric vehicles, etc., because the battery modules work in harsh environments, it will cause The internal components of the battery pack, control switches, internal circuits and other components are aging, resulting in the failure of the external short circuit of the battery cell. On the other hand, due to defects in the manufacturing process of the battery or improper use of the battery, an internal short circuit failure of the battery cell may occur. If the battery has a short-circuit failure but is not diagnosed by the battery management system in time, a slight short-circuit will cause the battery capacity to decay, and when t...

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Problems solved by technology

[0002] During the use of batteries, such as battery modules in solar street lamps, battery modules in energy storage power stations, battery modules in electric vehicles, etc., because the battery modules work in harsh environments, it will cause The internal components, control switches, internal circuits and other components of the battery are aging, resulting in the failure of the external short circuit of the battery cell

On the other hand, due to defects in the battery manufacturing process or improper use of the battery, the internal short circuit of the battery cell will occur

If the battery has a short-circuit failure but cannot be diagnosed by the battery management system in time, a slight short-circuit will cause the battery capacity to decay, and when the short-circuit resistance is too small, the short-circuit resistance will generate a large amount of heat in a short time, which will cause the battery to fail. thermal runaway

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