Method and system for analyzing thermal runaway gas production of lithium ion battery containing hydrofluoric acid

A lithium-ion battery and analysis method technology, which is applied in the field of thermal runaway gas production analysis of lithium-ion batteries, can solve the problems of large sample gas consumption, achieve the effects of reducing usage, improving convenience, and improving data stability

Pending Publication Date: 2020-06-16
ZHEJIANG UNIV
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Problems solved by technology

[0005] Tunable diode laser absorption spectroscopy (TDLAS) and Fourier transform infrared absorption spectroscopy (FT-IR) are two common spectral absorption gas detection techniques, which are suitable for on-line or off-line detection and analysis of thermal runaway gases in lithium-ion batteries; In the absorption test, it is usually necessary to fill the gas into a special gas absorption cell and completely remove the air in the gas cell. This process consumes a large amount of sample gas

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  • Method and system for analyzing thermal runaway gas production of lithium ion battery containing hydrofluoric acid

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Embodiment 1

[0027] Embodiment one: the thermal runaway gas production analysis method of a lithium ion battery containing hydrofluoric acid, comprising the following steps:

[0028] Step 1: Put the battery into an explosion-proof tank and seal it, and heat-insulate the outside. The heat-insulation treatment can be done by setting up a heat-insulation layer to trigger the battery’s thermal runaway. After the battery’s thermal runaway, a large amount of gas will be generated, and the pressure of the explosion-proof tank will rise. After the pressure stabilizes, record the air pressure and temperature inside the tank at this time, remove the heat insulation layer outside the explosion-proof tank, and quickly cool the explosion-proof tank and the sample gas inside; the battery triggers thermal runaway in the explosion-proof tank to avoid gas leakage And reduce potential safety hazards, insulate the explosion-proof tank to reduce heat loss, ensure that the battery continues to run out of contro...

Embodiment 2

[0041] Embodiment two: the thermal runaway gas production analysis system of lithium-ion batteries containing hydrofluoric acid, such as figure 1 As shown, it includes an explosion-proof tank 1, a venturi tube 2, a corrosion-resistant dust collector 3, a cold trap 4, a diaphragm pump 5, a heat exchanger 6, a detection gas pool 7, an exhaust gas treatment device 8, and an induced draft fan 9 connected by pipelines in sequence. The internal circuit of the tank 1 is connected with a battery testing system 10. The explosion-proof tank 1 is wrapped with a detachable heat insulation layer 11. The explosion-proof tank 1 is provided with a barometer A12. A valve A13 is provided between the explosion-proof tank 1 and the Venturi tube 2. 4 and the diaphragm pump 5 are provided with a three-way valve B14, the three-way valve B14 is externally connected to an independent pipeline 15, the independent pipeline 15 is connected to the heat exchanger 6, and a three-way valve is provided between...

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Abstract

The invention discloses a method and system for analyzing thermal runaway gas production of hydrofluoric acid-containing lithium ion battery, relates to a lithium ion battery, and aims to solve the problem that a large amount of sample gas needs to be consumed in the process that a special gas absorption cell needs to be filled with gas and air in the gas absorption cell needs to be completely exhausted in a spectral absorption test. According to the method for analyzing the thermal runaway gas production of the lithium ion battery containing the hydrofluoric acid, the sample gas is transferred by adopting a two-step method, so compared with the prior art, the use amount of the sample gas is effectively reduced, and a gas production analysis result is prevented from being interfered. According to the invention, the gas sampling, detection and tail gas treatment are continuously carried out, and the convenience and safety of sample gas transfer are improved.

Description

technical field [0001] The present invention relates to lithium ion batteries, more specifically, it relates to a method and system for analyzing thermal runaway gas production of lithium ion batteries containing hydrofluoric acid. Background technique [0002] With the large-scale application of lithium-ion batteries, the safety of lithium-ion batteries has received more and more attention. During the use or storage of lithium-ion batteries, due to mechanical abuse, unreasonable charging and discharging systems, and intensified side reactions caused by aging, the battery will undergo an exothermic chain reaction in a short period of time, and the battery temperature will rise sharply, eventually developing The thermal runaway of the battery can cause serious accidents such as fire, smoke or even explosion. The process of battery thermal runaway is often accompanied by the generation of a large amount of gas, and with the development of thermal runaway, the composition and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01N21/3504G01N21/11H01M10/0525
CPCG01N21/11G01N21/3504G01N21/39G01N2021/3595G01N2021/399H01M10/0525Y02E60/10
Inventor 姜银珠潘斌
Owner ZHEJIANG UNIV
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