Method and system for preparing dynamic lithium ion battery diaphragm
A technology of lithium-ion battery and subsystem
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[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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