A kind of composite lithium ion battery separator and preparation process thereof
An ion battery and preparation process technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as affecting production efficiency, poor thermal insulation performance, poor drying and calendering effect, etc., to improve casting production capacity, The effect of improving product quality and shortening installation time
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Embodiment 1
[0048] see figure 1 , a composite lithium-ion battery diaphragm, the battery diaphragm each raw material parts by weight are: 23 parts of polyethylene, 35 parts of polypropylene, 2 parts of ethylene-propylene rubber, 4 parts of nano-silicon carbide, 1 part of polyethylene glycol, 0.8 parts of carbon fiber and 3 parts of polyethylene wax, the preparation process of the composite lithium-ion battery diaphragm, including the process steps of batching-melting material-casting-longitudinal stretching-transverse stretching-setting and winding, the specific steps are as follows:
[0049] (1) Ingredients: 23 parts of polyethylene, 35 parts of polypropylene, 2 parts of ethylene-propylene rubber, 4 parts of nano-silicon carbide, 1 part of polyethylene glycol, 0.8 parts of carbon fiber and 3 parts of polyethylene wax, and the prepared The raw materials are poured into the stirring equipment for stirring, the stirring rate is 800r / min, and the stirring time is 10min;
[0050] (2) Melt ma...
Embodiment 2
[0062] Battery diaphragm high temperature test experiment:
[0063] Table 1. Changes in shrinkage rate of battery separator in high temperature environment
[0064]
[0065]
[0066] The FST-02 film heat shrinkage performance tester is used for testing, and the specific test process is as follows:
[0067] (1) Sample preparation: Cut the sample into a long sample of 150mm×130mm, punch holes at both ends of the sample to install the sample on the instrument, and the linear distance between the two holes is 100mm.
[0068] (2) Test conditions: a laboratory environment of 23° C. and 50% RH.
[0069] (3) Test procedure: Clamp a sample to the fixture of FST-02 to ensure that the sample is flat, set the heat shrinkage temperature to 90°C, and the equipment starts to heat up. When the temperature in the test chamber reaches the set temperature, place the sample When it is sent into the test chamber, the sample shrinks due to heat, and the equipment force sensor and displaceme...
Embodiment 3
[0072] The specific operation steps of the casting machine are as follows:
[0073] Step 1: Adjust the heating wire 1051 inside the stirring paddle 105, the heating resistance wire inside the shell of the storage tank 102, and the heating tube 207 in different areas of the drying and flattening mechanism 200 to the specified working temperature according to the material characteristics;
[0074]Step 2: According to the thickness requirement of material calendering, according to the direction from the storage mechanism 100 to the winding mechanism 400, the rotating handle 201 drives the squeeze roller 205 to move up and down, so that the distance between the squeeze roller 205 and the conveyor belt 302 gradually decreases Small;
[0075] Step 3: Start the first motor 103 to drive the stirring paddle 105 to rotate, then pour the molten battery separator into the storage tank 102 through the feeding hopper 101 for stirring, and then drive the second motor 303 to drive the conveyo...
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