Identification method for micro short circuit of battery

An identification method and micro-short-circuit technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of large short-circuit resistance, inconspicuousness, and difficulty in effectively identifying micro-short circuits, and achieve rapid identification and product safety. The effect of performance improvement

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 initi

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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[0019] In the following, the method for identifying battery micro short circuit provided by the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0020] See figure 1 , The present invention provides a method for identifying battery micro-short circuits, which includes the following steps:

[0021] S1, provide a battery pack containing multiple battery cells;

[0022] S2. Collect the terminal voltage U of each battery cell in the battery pack i And terminal current I i ;

[0023] S3, according to the terminal voltage U i And terminal current I i , Calculate the electromotive force E of each battery cell i The deviation ΔE from the reference electromotive force E i , The internal resistance Z of each battery cell i Deviation ΔZ from the reference internal resistance Z i ;

[0024] S4, according to X i =ΔE i +α·ΔZ i Calculate the identification quantity of each battery cell X i , And the absolute value of the ident...

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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 the electromotive force E and internal resistance reduction phenomenons 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...

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Application Information

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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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