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Method for preparing lithium battery current collector by electrostatic coating polymer composite PTC powder

An electrostatic coating and polymer technology, applied in electrode carriers/current collectors, batteries, electrode manufacturing, etc., can solve the problems of difficult process uniformity control, limited application of PTC materials, etc., to solve the problem of rapid temperature rise and chain reaction caused by combustion And explosion, improve production efficiency and good yield, accurate and convenient effect

Inactive Publication Date: 2014-05-14
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Due to the characteristics of barium titanate ceramic materials, the processing of PTC materials is difficult to control the uniformity of traditional processing, which limits the application of PTC materials.
[0007] Due to the limitations of the traditional preparation of PTC components, PTC components and electrodes are processed separately, and then welded or glued to the plate to form a device, mainly small components, and there is no processing of huge ultra-thin functional lithium battery current collectors. to report

Method used

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  • Method for preparing lithium battery current collector by electrostatic coating polymer composite PTC powder
  • Method for preparing lithium battery current collector by electrostatic coating polymer composite PTC powder

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Embodiment 1

[0024] Such as figure 1 with figure 2 As shown, the method for preparing a lithium battery current collector by electrostatically coating polymer composite PTC powder in this embodiment includes the following steps: (1) Take 100g of polyethylene and 100g of carbon black, put them in a ball mill under the protection of nitrogen, and mix by ball milling After 5 hours, the polymer composite PTC powder was prepared; (2) The copper foil with a thickness of 5μm was discharged through the unwinding device 1, and the discharged copper foil was heated to 100°C by the heating device 2, and the width was 1.3 meters. The electrostatic coating machine 3 with a length of 5 meters is continuously coated for 600 meters at a speed of 50 meters per minute, and the coating thickness of the polymer composite PTC powder is controlled to 2.5 μm through the flow control valve 4 provided on the electrostatic coating machine. It is cooled and crystallized by the cooling device 5, and then enters the w...

Embodiment 2

[0026] The method for preparing a lithium battery current collector by electrostatically coating polymer composite PTC powder in this embodiment includes the following steps: (1) Take 10g of polypropylene and 100g of barium titanate powder and put them into a three-screw blending reactor under the protection of nitrogen. (2) The aluminum foil with a thickness of 3μm is discharged through the unwinding device, and the discharged aluminum foil is heated to 150°C by the heating device. The width is 1.3 meters and the length is 1.3 meters. On a 5m electrostatic coating machine, continuous coating for 600 meters at a speed of 50m / min. The coating thickness of the polymer composite PTC powder is controlled by the flow control valve on the electrostatic coating machine to 1μm, and the cooling device is used to cool and crystallize , And then enter the winding device to complete the electrostatic spraying of polymer composite PTC powder on the aluminum foil; (3) Take out the aluminum fo...

Embodiment 3

[0028] The method for preparing a lithium battery current collector by electrostatically coating polymer composite PTC powder in this embodiment includes the following steps: (1) Take 50g of polyimide and 100g of barium titanate powder with a lead content of 0.3% in nitrogen. Put it into a three-screw blending reactor under protection and mix for 5 hours to obtain polymer composite PTC powder; (2) The copper foil with a thickness of 15μm is discharged through the unwinding device, and the discharged copper foil is heated by the heating device Up to 180°C, on an electrostatic coating machine with a width of 1.3 meters and a length of 5 meters, continuous coating for 600 meters at a speed of 50 meters per minute. The polymer composite PTC powder is controlled by the flow control valve set on the electrostatic coating machine The body coating thickness is 2.5μm, it is cooled and crystallized by the cooling device, and then enters the winding device to complete the double-sided elec...

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Abstract

The invention discloses a method for preparing lithium battery current collector by electrostatic coating polymer composite PTC powder. The method comprises the steps of (1) preparing the polymer composite PTC powder; (2) heating the lithium battery current collector up to 100-300 DEG C by a heating device, and coating the lithium battery current collector with the polymer composite PTC powder obtained in the step (1) through an electrostatic coating device to form a polymer composite PTC powder coating on the lithium battery current collector; (3) baking the lithium battery current collector coated with the polymer composite PTC powder coating in the step (2), and carrying out a recrystallization technology to obtain the lithium battery current collector provided with the polymer composite PTC powder coating. After the method is adopted, the problems of damage and explosion caused by heating of a lithium battery can be solved, so that the problems of combustion and explosion caused by rapid heating and chain reaction since the current of the current collector is overhigh due to overheating of the interior of the lithium battery can be further solved.

Description

Technical field [0001] The invention relates to the field of preparation of lithium battery current collectors, in particular to a method for preparing a lithium battery current collector by electrostatically coating polymer composite PTC powder. Background technique [0002] In the process of lithium battery application, when a short circuit such as a needle stick or a severe collision occurs inside the battery, the instantaneous current increases sharply, causing the battery to heat up, which causes a series of chain reactions, and finally causes the lithium battery to catch fire and explode. A phenomenon, some people use PTC sensors to stick to the connection circuit of the battery or the battery shell for prevention. Because these devices and components are outside the lithium battery, it is impossible to obtain the temperature rise information inside the lithium battery in time and respond in time, resulting in prevention Lag, can not meet the purpose of safety protection of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/04
CPCH01M4/0404H01M4/667H01M10/0525H01M2200/106Y02E60/10
Inventor 张迎晨吴红艳
Owner ZHONGYUAN ENGINEERING COLLEGE
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