Method and system for preparing dynamic lithium ion battery diaphragm
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A technology of lithium-ion battery and subsystem
Inactive Publication Date: 2011-10-05
SHANGHAI QIANCHENG TOY TECH
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[0017] The object of the present invention is to provide a kind of preparation method of power lithium-ion battery diaphragm, to solve the equipment usage amount that produces lithium-ion battery diaphragm in the prior art, equipment cost is higher and the produced lithium-ion battery diaphragm defective occurrence rate , Defects with high production requirements
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preparation example Construction
[0055] The invention provides a method for preparing a power lithium-ion battery diaphragm, comprising the following steps:
[0056] 1. Add ultra-high molecular polyethylene, antioxidant and mineral oil into the mixer in a certain proportion to fully stir the raw materials;
[0057] 2. Put the mixture stirred in step 1 into a twin-screw extruder to heat and extrude continuously to form a substrate;
[0058] 3. The substrate extruded from the twin-screw extruder is divided into the first processing line and the second processing line for simultaneous processing;
[0059] 4. Processing of substrates entering the first processing line:
[0060] (1) The substrate entering the first processing line is cooled and formed by a set of cooling rollers;
[0061] (2) Stretch the cooled and formed substrate in both horizontal and vertical directions simultaneously through biaxial stretching equipment, so that the substrate can be stretched into a diaphragm;
[0062] (3) Use an alkane extr...
Embodiment 1
[0072] Embodiment 1, the steps of a lithium-ion battery diaphragm preparation method in this embodiment are as follows:
[0073] 1. Add ultra-high molecular weight polyethylene, antioxidant and mineral oil into the mixer in a certain proportion to fully stir the raw materials. Among them, the mass ratio of mineral oil to antioxidant is 1000~2000:1, mineral oil and The mass ratio of UHMWPE is 2~10:1.
[0074] The ultrahigh molecular weight polyethylene in this example has a molecular weight of 1 million or more.
[0075] 2. Put the mixture stirred in step 1 into a twin-screw extruder to heat and extrude continuously to form a substrate.
[0076] Here, the screw diameter of the twin-screw extruder is 10-150 mm, and its extrusion capacity is greater than 200 kg per hour.
[0077] 3. The substrate extruded from the twin-screw extruder is divided into the first processing line and the second processing line for simultaneous processing.
[0078] 4. Processing of substrates enteri...
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Abstract
The invention provides a method for preparing a dynamic lithium ion battery diaphragm. The method comprises the following steps: firstly, adding raw materials in a blender, and abundantly stirring; next feeding the stirred materials into a twin-screw extruder, and heating while continuously extrusion, so as to base sheet; thirdly, shunting the base sheet extruded from the extruder and then feeding the shunted base sheet into two same processing lines and simultaneously and respectively processing, wherein the respective processing line is as follows: 1, cooling and forming; 2, transversely and longitudinally stretching the cooled and formed base sheets through a two-way stretch device at the same time, so that the base sheet is stretched to form a diaphragm; 3, extracting out ore oil fromthe diaphragm with an alkane extractant by virtue of an extraction groove; 4, through a transverse stretch device, shaping, stretching and rectifying the diaphragm subjected to extraction, and ensuring the volatilization of the residual extract on the diaphragm; and 5, thermally treating the diaphragm. According to the invention, the defects that when the battery diaphragm is produced in the prior art, the equipment usage amount is large, the equipment cost is high, and the inferior-quality product incidence and production requirement of the prepared lithium ion battery diaphragm are high aresolved.
Description
technical field [0001] The invention relates to a preparation method, in particular to a preparation method of a power lithium ion battery diaphragm. Background technique [0002] Rechargeable lithium-ion secondary battery has the characteristics of high specific energy, long cycle life, no memory effect, and has the advantages of safety, reliability and fast charge and discharge, so it has become a hot spot in the research of new power supply technology in recent years. Since lithium-ion batteries are green, environmentally friendly and non-polluting secondary batteries, they meet the major development needs of energy and environmental protection in various countries today, and their usage in all walks of life is increasing rapidly. At present, secondary lithium-ion batteries are not only widely used in digital electronic products such as mobile phones, notebook computers, and MP3, but also in some high-power batteries such as electric vehicles and electric bicycles in rece...
Claims
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