Identification method for micro short circuit of battery

An identification method and micro-short-circuit technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of large, inconspicuous and difficult to effectively identify micro-short-circuits, etc., to improve product safety performance, The effect of quick recognition

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

The short-circuit resistance of micro-short circuit is relatively large. In the non-adiabatic state, the temperature rise caused by it is generally not greater than 5°C. The initial phenomenon is very inconspicuous, so the existing external measures such as electrical management or temperature management are difficult to be effective. Identify micro-shorts

Method used

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  • Identification method for micro short circuit of battery
  • Identification method for micro short circuit of battery
  • Identification method for micro short circuit of battery

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Embodiment Construction

[0020] The method for identifying a short circuit in a battery provided by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] see figure 1 , the first embodiment of the present invention provides a method for identifying a battery micro-short circuit, comprising the following steps:

[0022] S11, providing a battery pack including a plurality of battery cells;

[0023] S12, collect the terminal voltage U of each battery cell in the battery pack i And terminal current I i ;

[0024] S13, according to the terminal voltage U i And terminal current I i , calculate the internal resistance Z of each battery cell i Deviation ΔZ relative to the reference internal resistance Z i ;

[0025] S14, for the internal resistance deviation ΔZ i Find outliers;

[0026] S15, if the internal resistance deviation ΔZ of a certain battery cell m i If it is an abnormal value, it is determined that...

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Abstract

The invention discloses an identification method for micro short circuit of a battery. The identification method is based on an equivalent parameter principle. The identification method includes that using an internal resistance Zi abnormity phenomenon of a battery under a micro short circuit state to identify the battery which occurs the micro short circuit; judging whether the micro short circuit is external short circuit or internal short circuit according to an information entropy H of the battery which occurs the micro short circuit. The identification method for the micro short circuit of the battery precisely and quickly identifies the micro short circuit of the battery and solves the problem that the prior art is difficult to identify because the micro short circuit phenomenon of the battery is not obvious.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for identifying micro-short circuits of batteries. Background technique [0002] Under the dual pressure of energy crisis and environmental pollution, electrification of vehicle power system has gradually become the mainstream of future vehicle technology development. Lithium-ion batteries are one of the main choices for the power source of electric vehicles due to their advantages in energy density and cycle life. However, safety accidents of lithium-ion power batteries occur occasionally, and the safety problems of lithium-ion power batteries will threaten the safety of people's lives and property, and hinder the large-scale industrialization of electric vehicles. The small-scale internal short circuit and small-scale external short circuit of a battery cell can be collectively referred to as a micro short circuit. Most of the safety problems in the nor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R31/36
Inventor 张明轩欧阳明高卢兰光何向明
Owner TSINGHUA UNIV
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