Recognition method of micro-short circuiting of batteries

An identification method and micro-short-circuit technology, applied in circuits, secondary batteries, secondary battery testing, etc., can solve the problems of low reliability, hidden dangers, consumption of battery cells, etc., to achieve high reliability, improve safety, Simple to use effects

Active Publication Date: 2015-05-13
TSINGHUA UNIV
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Problems solved by technology

The short-circuit resistance of the micro-short circuit is large, and it will not cause a significant temperature rise in the adiabatic state, but the short-circuit resistance will continue to consume the electric energy of the battery cell, which is called the consumption effect of the short-circuit resistance. Due to the consumption effect of the short-circuit resistance, it will causing the terminal voltage of the battery cell to drop
The existing technology usually detects whether the battery has a micro-short circuit by testing the voltage drop after leaving the battery for a period of time. This method is not only time-consuming and labor-intensive, but also has low reliability (there is a large error in direct measurement of the voltage drop). Moreover, failure to identify and detect the micro-short circuit phenomenon that occurs during battery use in a timely manner may cause the micro-short circuit phenomenon that occurs during battery operation to be converted into a large-scale short circuit phenomenon, causing serious safety hazards

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  • Recognition method of micro-short circuiting of batteries
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  • Recognition method of micro-short circuiting of batteries

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Embodiment Construction

[0022] see figure 1 , the first embodiment of the present invention provides a method for identifying a battery micro-short circuit, which is used to identify the micro-short circuit phenomenon of a battery pack composed of multiple battery cells connected in series during use. The specific steps include:

[0023] S11, collect the voltage of each of the battery cells in real time to obtain a voltage set U(t) of each battery cell, the voltage set U(t) includes multiple voltages U, and the multiple voltages U are associated with multiple times One-to-one correspondence between points t;

[0024] S12. Calculate a certain time point t among the multiple time points t for each of the battery cells i The voltage derivative dU / dt(t=t i );

[0025] S13, judging the voltage derivative dU / dt(t=t) of each battery cell i ), whether there is an outlier point in ), the outlier point refers to the voltage derivative dU / dt (t=t i ) is much smaller than other voltage derivatives dU / dt(t=t...

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Abstract

The invention provides a recognition method of micro-short circuiting of batteries. Whether a series-connected battery pack has micro-short circuiting, which specific battery cell has micro-short circuiting and what time micro-short circuiting occurs can be judged by judging whether an off-group point exists in voltage derivative or voltage differential of each battery cell of the series-connected battery pack at the same time, and the condition that micro-short circuiting is internal short circuiting or external short circuiting can be distinguished with an information entropy judgment method. The recognition method of micro-short circuiting of the batteries plays a key role on safety improvement of products, such as an electric car and an airplane, utilizing the power battery pack.

Description

technical field [0001] The invention belongs to the field of battery technology, and in particular relates to a method for identifying a battery cell in which a micro-short circuit occurs in a series battery pack. Background technique [0002] Under the dual pressure of energy crisis and environmental pollution, the electrification of automotive power systems has gradually become the mainstream of future automotive technology development. Lithium-ion power batteries are one of the main choices for power sources of electric vehicles due to their advantages in energy density and cycle life. , usually by combining lithium-ion power batteries into battery packs to meet the electric drive requirements of electric vehicles. However, in recent years, safety accidents of lithium-ion power batteries have occasionally occurred. Most of the safety problems of lithium-ion power batteries can be controlled or alleviated through external measures such as electrical management or temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4285Y02E60/10
Inventor 张明轩欧阳明高卢兰光何向明
Owner TSINGHUA UNIV
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