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A fire warning method for lithium-ion batteries in energy storage systems

A lithium-ion battery and fire warning technology, applied in the field of lithium-ion batteries, can solve the problems that temperature data cannot reflect the temperature distribution characteristics of the battery, the analysis and judgment affecting the safety of the lithium battery, and the inability to know the maximum temperature of the battery, etc. Thermal runaway monitoring, real-time display, and the effect of preventing heat accumulation

Active Publication Date: 2022-03-18
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Thermocouple detection technology is a contact temperature measurement technology, so in lithium-ion battery energy storage systems, only thermocouple monitors can be used to measure the temperature of sampling points on the battery surface, and the maximum temperature of the battery cannot be known. mistake
In addition, limited temperature data cannot reflect the overall temperature distribution characteristics of the battery, which directly affects the analysis and judgment of lithium battery safety.
[0006] Infrared thermal imaging technology is a flexible automatic temperature measurement technology, but in energy storage systems, infrared imaging is a surface temperature measurement technology, and lithium-ion batteries in energy storage systems are generally placed in the form of battery packs, which will What causes it to measure is only the temperature distribution at all points on the battery surface
And when measuring the temperature of the lithium-ion battery, it is necessary to align the surface of the lithium-ion battery pack vertically. In any case, the angle should not exceed 30°, and the distance from the radiation source to the optical system should not be too far. There are certain limitations in the application of energy storage systems

Method used

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  • A fire warning method for lithium-ion batteries in energy storage systems
  • A fire warning method for lithium-ion batteries in energy storage systems
  • A fire warning method for lithium-ion batteries in energy storage systems

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1: as Figure 1-3 , shown in 5, a lithium ion battery fire warning system for an energy storage system, including an energy storage component and an early warning system, the energy storage component includes an energy storage box 2 and a lithium ion battery, and the early warning system includes a laser 1, an optical isolator 3, Optical coupler 4, AOM5, fiber amplifier 6, depolarizer 7, first circulator 9, second circulator 8, fiber Bragg grating FBG10, fiber controller 11, EOM12, frequency sweeper 13, photodetector 14, Data collector 15, computer 16,

[0049] The laser 1 is connected to the optical isolator 3 and the optical coupler 4 in sequence, the output end of the optical coupler 4 is respectively connected to the receiving end of the optical fiber controller 11 and the receiving end of the AOM5, and the output end of the AOM5 is connected to the receiving end of the optical fiber amplifier 6 , the output end of the optical fiber amplifier 6 is connec...

Embodiment 2

[0080] Embodiment 2: The structure of the lithium-ion battery fire warning system of the energy storage system in this embodiment is basically the same as the structure of the lithium-ion battery fire warning system of the energy storage system in Embodiment 1, except that the battery unit 24 is a cylindrical hollow structure;

[0081] Both the sensing fiber inlet 25 and the sensing fiber outlet 26 are funnel-shaped structures, the ends of the sensing fiber inlet 25 and the sensing fiber outlet 26 are fixedly provided with a hollow convex body 27, and the bottom end of the hollow convex body 27 is provided with a semi-circular Tube 28, semi-circular tube 28 is the sensing fiber channel, the sensing fiber channel is arranged on the outer wall of the battery unit 24, and the sensing fiber 29 is arranged in the sensing fiber channel; Lithium-ion battery cells are attached closely to realize the fixation of the sensing optical fiber.

Embodiment 3

[0082] Embodiment 3: The structure of the lithium-ion battery fire warning system of the energy storage system in this embodiment is basically the same as the structure of the lithium-ion battery fire warning system of the energy storage system in Embodiment 2. The difference is that the warning system also includes a display 17, a controller 18, a fire alarm Telephone terminal 19, buzzer 20 and warning light 21, display 17, controller 18 are all connected with computer 16, fire alarm telephone terminal 19, buzzer 20 and warning light 21 are all connected with controller 18;

[0083] When the temperature data of the lithium-ion battery is greater than 60°C or the axial strain is greater than 4% (2.5mm), the yellow light of the alarm system will flash and the buzzer will work (stop beeping), prompting the site responsible personnel to monitor the temperature of the battery body of the energy storage system And the strain is in the harmful working environment of lithium-ion batte...

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Abstract

The invention relates to a fire warning method for a lithium-ion battery in an energy storage system, belonging to the technical field of lithium-ion batteries. The early warning method of the present invention adopts the lithium ion battery fire early warning system of the energy storage system. A plurality of lithium ion battery cells of the present invention can be loaded into the battery unit of the energy storage box, and an air flow channel is arranged outside the battery unit, which can prevent the energy storage box from For the accumulation of heat in the body, each battery unit contains a sensing fiber optic channel, so that the temperature and strain parameter changes of each lithium-ion battery cell are monitored by the sensing fiber, and converted into electrical signals by photodetectors, and the data is collected After being collected by the sensor, it is transmitted to the computer for statistics, and real-time monitoring and early warning. The invention realizes the real-time display of the temperature and strain of the single battery in the lithium-ion battery module, and can conveniently and effectively monitor the thermal runaway of the lithium-ion battery system of the energy storage system.

Description

technical field [0001] The invention relates to a fire warning method for a lithium-ion battery in an energy storage system, belonging to the technical field of lithium-ion batteries. Background technique [0002] A large number of lithium-ion battery energy storage projects have been deployed at home and abroad. With the continuous deployment of energy storage power stations, fire accidents in energy storage systems have become more frequent, and fire accidents in lithium-ion battery energy storage systems are mostly caused by lithium-ion battery Fire accidents caused by thermal runaway. As a key component of the energy storage system, lithium-ion batteries have a huge impact on the energy storage capacity, safety and economy of the entire energy storage system. [0003] Although the thermal runaway process of lithium-ion batteries is very complicated, its essence can be regarded as the instantaneous overheating expansion process in a confined space caused by abnormal use o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/48G01B11/16G01K11/322G08B17/06G08B7/06H05K7/20
CPCG08B17/06G08B7/06H01M10/486H01M10/482H01M10/488G01B11/18G01K11/3206H05K7/20127Y02E60/10
Inventor 程海勇牛永辉朱加琦张小强刘津王锐
Owner KUNMING UNIV OF SCI & TECH
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