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Real-time overcharge and thermal runaway prediction method for lithium-ion batteries based on dynamic impedance

A lithium-ion battery and dynamic impedance technology, which is applied in the direction of battery, secondary battery, secondary battery repair/maintenance, etc., to achieve the effect of avoiding personal injury and

Active Publication Date: 2021-10-15
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a real-time overcharge and thermal runaway prediction method for lithium-ion batteries based on dynamic impedance, so as to solve the shortcomings of the existing safety warning methods for lithium-ion batteries

Method used

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  • Real-time overcharge and thermal runaway prediction method for lithium-ion batteries based on dynamic impedance
  • Real-time overcharge and thermal runaway prediction method for lithium-ion batteries based on dynamic impedance
  • Real-time overcharge and thermal runaway prediction method for lithium-ion batteries based on dynamic impedance

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Embodiment 1

[0029] like figure 1 As shown, the real-time overcharge and thermal runaway prediction method for lithium-ion batteries based on dynamic impedance includes the following steps,

[0030] S1: Inject an excitation current of N frequency into the lithium-ion battery in the charging state through the current source in the dynamic impedance device, and the range of N is 50-100;

[0031] S2: measure the response voltage of the lithium-ion battery at N frequency in real time;

[0032] S3: dividing the response voltage obtained in S2 by the phasor of the excitation current in S1 to obtain the real-time dynamic impedance of the lithium-ion battery at the N frequency;

[0033] S4: According to the real-time dynamic impedance of the lithium ion battery described in S3, the slope K of the dynamic impedance of the lithium ion changing with the charging time is obtained, and the state of the battery is judged by the slope K;

[0034] When the slope K exceeds the lower limit threshold M, it...

Embodiment 2

[0039] On the basis of Example 1, as Figure 5 As shown, the excitation current in S1 is a sinusoidal excitation current. When there are multiple lithium-ion batteries, the battery under test can be switched through the multiplexer. The programmable gain amplifier removes DC, filters and amplifies the AC component of the collected voltage, and then uses an analog-to-digital converter to digitally convert the processed voltage, and finally uses a digital signal processor to perform Fusion on the digitally converted voltage. The Liye transform calculates the voltage component of the lithium-ion battery at N frequency, and then calculates the dynamic impedance value. The model of the instrumentation amplifier is AD620, the model of the programmable gain amplifier is PGA202, and the analog-to-digital converter The model of the digital signal processor is AD7606, and the model of the digital signal processor is TMS320F28335. The dynamic impedance of the lithium-ion battery in the t...

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Abstract

The invention discloses a real-time overcharge and thermal runaway prediction method for a lithium-ion battery based on dynamic impedance measurement. By measuring the dynamic impedance of a lithium-ion battery in a charging state, the state of the battery is judged according to the dynamic impedance slope K of the lithium-ion battery. When the ion battery is in a normal charging state, the slope K will fluctuate within the set interval. When the slope K exceeds the set lower threshold M, it is judged that the battery is about to be overcharged. When the slope K is greater than 0 and remains positive, it is judged that the battery is in In the overcharge state, the method provided by the present invention is simple and reliable, and can carry out early safety warning of lithium-ion batteries as soon as possible, perceive safety problems in a timely manner, and use this as early warning information to allow enough time for processing to prevent fire or explosion, etc. The occurrence of safety accidents is to protect the safety of personnel and the normal operation of equipment.

Description

technical field [0001] The invention relates to the field of lithium-ion battery safety, in particular to a real-time overcharge and thermal runaway prediction method for lithium-ion batteries based on dynamic impedance. Background technique [0002] With the rapid expansion of renewable resources such as wind and solar, the need for grid-scale energy storage continues to increase around the world. Grid-scale energy storage can help facilitate the development of renewable energy and provide ancillary services to the grid. Among many energy storage technologies, lithium-ion batteries have become the most popular and main energy storage medium due to their high specific energy, low self-discharge rate, no memory effect and long cycle life. However, limited by the chemical characteristics and the current level of architecture, the capacity of lithium-ion battery cells is limited. In order to obtain higher capacity, dozens of battery cells are densely connected in each battery...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42G01R31/367G01R31/389G01R31/385G01R31/378
CPCG01R31/367G01R31/378G01R31/385G01R31/389H01M10/4207H01M2200/00Y02E60/10
Inventor 金阳吕娜伟姜欣高金峰
Owner ZHENGZHOU UNIV