Device and method for testing in-situ gas chromatography generated inside lithium ion battery

A lithium-ion battery and gas chromatography technology, which is applied in the field of in-situ gas chromatography testing devices for gases, can solve problems such as difficult electrode potential calibration, gas volume cannot be quantified and analyzed, and the specific source of gas cannot be determined, etc., to achieve data Accurate, easy to detect the effect

Inactive Publication Date: 2018-02-23
DONGGUAN MCNAIR NEW POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At this stage, the analysis of the flatulence components of lithium-ion batteries is still in the traditional means of extracting gas off-line and then characterizing it. This analysis method has the following disadvantages: first, it is difficult to calibrate the electrode potential when the gas is precipitated; second, The specific source of gas generation cannot be determined; then, the volume of gas generation at different stages cannot be quantitatively and analytically compared

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  • Device and method for testing in-situ gas chromatography generated inside lithium ion battery
  • Device and method for testing in-situ gas chromatography generated inside lithium ion battery
  • Device and method for testing in-situ gas chromatography generated inside lithium ion battery

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Embodiment 1

[0033] The invention provides an in-situ gas chromatographic test device for gas generated inside a lithium-ion battery, comprising a carrier gas supply unit 1, an inert gas supply unit 2, a power supply unit 3, a reaction unit 4 containing lithium-ion cells, Gas collection unit 5, gas chromatograph 6 and data acquisition and processing unit 7, carrier gas supply unit 1 is connected to gas chromatograph 6, inert gas supply unit 2 is connected to reaction unit 4, power supply unit 3 is connected to reaction unit 4 The inlet end of the gas collection unit 5 is connected to the reaction unit 4, the outlet end of the gas collection unit 5 is connected to the gas chromatograph 6, the gas chromatograph 6, the power supply unit 3, and the reaction unit 4 are all connected to the data acquisition and processing unit 7. Carrier gas supply unit 1 provides carrier gas for gas chromatograph 6, and inert gas supply unit 2 provides inert gas for reaction unit 4. In the present invention, the...

Embodiment 2

[0059] This embodiment provides a method of using the device and method of Embodiment 1 to conduct online testing of the gas generated during the formation of square lithium-ion cells:

[0060] Preparing lithium-ion batteries in a square shape: through stirring, coating, cold pressing of pole pieces, winding, packaging, and baking to remove moisture, the square batteries to be injected are obtained, and the batteries are placed in a completely dry reaction kettle. The liquid is injected in a glove box filled with argon gas. After the liquid injection is completed, the reactor is sealed with six sets of symmetrical screws and sealing rings, and a layer of vacuum grease is applied to the connection to ensure absolute sealing.

[0061] Then, the formation is carried out. After the battery cell after the liquid injection is left to stand for a period of time, it is formed, and the gas generated during the formation process is tested online. The positive electrode material of the s...

Embodiment 3

[0066] This embodiment provides a method of using the device and method of Embodiment 1 to conduct online testing of the gas generated during the charging and discharging process of cylindrical cells with different moisture contents:

[0067] Dry the coated positive and negative pole pieces at 120°C for 4h, 8h, and 16h, respectively. Ultrasonic spot welding machine is used to weld the tabs. The negative electrode uses copper foil as the current collector, the positive electrode uses aluminum foil as the current collector, the positive electrode uses aluminum sheet, and the negative electrode uses nickel sheet as the tab. Winding and fixing with insulating tape to obtain a cylindrical lithium-ion cell, put the cell into a vacuum oven, and dry at 80±5°C for 12 hours. Place the prepared cell and reactor in a glove box filled with argon to inject the electrolyte, and then fix and seal them with screws and vacuum grease. In order to prove that the test electrolytic cell is close to...

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Abstract

The invention belongs to the technical field of lithium ion battery testing and in particular relates to a device and a method for testing in-situ gas chromatography generated inside a lithium ion battery. The device comprises a carrying gas supply unit, an inert gas supply unit, a power supply unit, a reaction unit, a gas collection unit, a gas chromatograph and a data acquisition and processingunit, wherein the reaction unit comprises a lithium ion cell; the carrying gas supply unit is connected with the gas chromatograph; the inert gas supply unit is connected with the reaction unit; the power supply unit is connected with the reaction unit; the inlet end of the gas collection unit is connected with the reaction unit; the outlet end of the gas collection unit is connected with the gaschromatograph; and the gas chromatograph, the power supply unit and the reaction unit are all connected with the data acquisition and processing unit. By adopting the device and the method, gases generated from the lithium ion cell under different conditions of formation, over charge and over discharge, short circuits and the like at different stages can be conveniently and rapidly collected, thenin-situ analysis on components and contents of the gases generated from lithium ion batteries can be achieved, and FA (Failure Analysis) on the lithium ion batteries is simulated in real time.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery testing, and in particular relates to an in-situ gas chromatography testing device and method for gas generated inside a lithium-ion battery. Background technique [0002] With the rapid development of computers, mobile electronic products, entertainment and communication equipment, lithium-ion secondary batteries, the key components, have received extensive attention due to their advantages such as high energy density, long cycle life, high open circuit voltage, safety and pollution-free. The development of electric vehicles and hybrid electric vehicles has greatly promoted the development of lithium-ion batteries, which requires lithium-ion batteries to have higher specific energy, and with the improvement of specific energy, there are certain hidden dangers in its safety. An important factor affecting safety is the generation of gas inside the lithium-ion battery. A large amount of ...

Claims

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Application Information

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IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 谢金玲刘继策邓耀明宋晓娜
Owner DONGGUAN MCNAIR NEW POWER
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