Online monitoring method for short-circuit fault in battery energy storage system caused by low-temperature working condition

A battery energy storage system, internal short circuit technology, applied in short circuit testing, measuring electricity, measuring devices and other directions, can solve the problems of lithium dendrite piercing the diaphragm, direct contact between positive and negative electrodes, etc., to ensure safe and reliable operation at low temperature, reduce The effect of solving complexity and reducing the probability of misidentification

Inactive Publication Date: 2021-06-11
SICHUAN UNIV
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Problems solved by technology

Larger lithium dendrites will pierce the separator and even cause direct contact between the positive and negative electrodes

Method used

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  • Online monitoring method for short-circuit fault in battery energy storage system caused by low-temperature working condition
  • Online monitoring method for short-circuit fault in battery energy storage system caused by low-temperature working condition
  • Online monitoring method for short-circuit fault in battery energy storage system caused by low-temperature working condition

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Embodiment Construction

[0084] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0085] The technical solution of the present invention can be divided into four major steps, which are respectively establishing an equivalent model including the internal short circuit of the lithium battery, analyzing the typical process and interference factors of the internal short circuit fault of the lithium battery under low temperature conditions, and determining the characteristic value of the internal short circuit curve caused by the low temperature condition and lithium battery internal short-circuit safety status assessment, where each major step and its minor steps are described in detail as follows:

[0086] Step 1. Establish an equivalent model of a lithium battery internal short circuit

[0087] ① In engineering, the Thevenin model connected by second-order RC circuits is generally used to equivalently simulate the tr...

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Abstract

The invention discloses an on-line monitoring method for a short-circuit fault in a battery energy storage system caused by a low-temperature working condition, and the method comprises the steps: firstly building a lithium battery internal short-circuit equivalent model to simulate the transient response of voltage along with the change of a current load during the internal short circuit of a lithium battery; secondly, analyzing typical processes and interference factors of lithium battery internal short circuit faults under a low-temperature working condition based on a lithium battery chemical principle, calculating correlation coefficients among single batteries, and determining internal short circuit curve characteristic values caused by the low-temperature working condition; and finally, counting all internal short-circuit frequencies based on the battery correlation coefficient characteristic values, and performing safety state evaluation on the internal short circuit of the lithium battery. According to the invention, based on the internal short circuit waveform characteristics of the single cell, the precision is improved by using the moving window filter and the active noise reduction method, and the online monitoring of the low-temperature internal short circuit of the lithium battery is effectively realized.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to an online monitoring method for short-circuit faults in a battery energy storage system caused by low-temperature working conditions. Background technique [0002] Mobile energy storage units based on lithium batteries have high energy density, long cycle life, and no memory effect, and have been widely used in electronic products (such as mobile phones, watches, microcomputers) and various electromechanical equipment (electric vehicles, mobile energy storage power stations) , the 2022 Beijing Winter Olympics will introduce lithium titanate-lithium iron phosphate mobile energy storage vehicles for the first time as emergency backup power supplies in the Yunding competition area. Leading to the interruption of the event, causing huge economic losses, and even causing serious safety problems. In recent years, there have been several safety accidents related to lithium-i...

Claims

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Application Information

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IPC IPC(8): G01R31/52G01R31/385G01R31/367G01R31/396G01R31/392
CPCG01R31/367G01R31/385G01R31/392G01R31/396G01R31/52
Inventor 肖先勇陈智凡汪颖郑子萱
Owner SICHUAN UNIV
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