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Composite battery diaphragm

A composite battery and diaphragm technology, which is applied to battery components, circuits, electrical components, etc., can solve the problem that the battery diaphragm is difficult to meet the safety requirements of lithium-ion batteries, and achieve low production process cost, low price, excellent breathability The effect of sex and heat shrinkability

Active Publication Date: 2013-05-22
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, it is difficult for battery separators prepared by wet or dry methods to meet the above safety requirements for lithium-ion batteries, especially for large-scale power batteries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation process of this example is as follows figure 1 As shown, weigh 200 grams of polytetrafluoroethylene and 2 kilograms of N-methylpyrrolidone, abbreviated as NMP, put them into the glue pool 2, stir and fully dissolve, and take a roll of polyethylene porous with a thickness of 10 μm and a porosity of 42%. The film is fixed at unwinding 1, and a roll of polypropylene non-woven fabric with a gram weight of 15 g / m2 is placed at unwinding 5, and the polyethylene porous film and non-woven fabric are both unwound at a speed of 15 cm / s. Roll, wherein, the polyethylene porous membrane is glued on the gluing pattern roller 3 with reticular lines, the depth of the mesh groove of the gluing pattern roller 3 is 2 μm, and the excess glue is scraped off by the squeegee roller 4, and the gluing The final polyethylene porous film and non-woven fabric are bonded and compacted at the press roller 6 and press roller 7, and finally the obtained compacted polyethylene porous fi...

Embodiment 2

[0032] The preparation process of this example is as follows figure 2 As shown, a roll of thickness is 12 μ m, porosity is 42%, the polyethylene microporous membrane that width is 250 mm and a roll of grammage is 12 g / m2 polypropylene non-woven fabric are respectively fixed on unwinding 9 and 10 locations, and unwind at a speed of 3 cm / s. On the way, the polyethylene microporous film is pretreated at a temperature of 100°C and passes through a mesh pattern roller 12 with heat-conducting oil. The roller temperature is 150°C and the Shore The rubber pressure roller 11 with a hardness of 55 degrees moves down to press the patterned roller. The pressure is set at 0.5MPa. After compounding, it is shaped by the shaping roller 13, and the temperature is set at 125°C. Finally, it is wound by the winding roller 14 to obtain heat resistance. Lithium-ion battery porous membrane, that is, the composite battery separator in this example.

Embodiment 3

[0034] Composite battery diaphragm is prepared according to the method of Example 2, the difference is that the thickness of the polyethylene microporous membrane used is 16 μm, and the porosity is 47%; Ethylene glycol diformate non-woven fabric; and, the unwinding speed of the polyethylene microporous film and the non-woven fabric is 5 cm / s, the temperature of the patterned roller is 210 ° C, and the Shore hardness of the rubber pressing roller is 45 degrees, The pressure is 1.5MPa, and the temperature of the sizing roller is set at 110°C. All the other are identical with embodiment 2.

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Abstract

The application discloses a composite battery diaphragm comprising a nonwoven fabric layer and a polyolefin microporous membrane layer which are combined and fixedly connected to form the composite battery diaphragm. According to the composite battery diaphragm disclosed by the application, the non-woven fabric layer serves as a support body and ensures the high-temperature heat resistance of the composite battery diaphragm; and the polyolefin microporous membrane layer ensures the low-temperature close property of the composite battery diaphragm. The excellent air permeability and thermal contraction and a high membrane rupture temperature of the composite battery diaphragm are ensured on the basis of not changing the original characteristics and properties of the polyolefin microporous membrane; the low-temperature close property and the high-temperature heat resistance of the battery diaphragm are effectively coordinated; and the non-woven fabric is low in cost, so that the cost of the production process of the composite battery diaphragm is low.

Description

technical field [0001] The present application relates to the field of battery separators, in particular to a composite battery separator. Background technique [0002] With the advancement of information, materials and energy technologies, lithium-ion batteries have become a hot spot in the research of new power supply technologies due to their advantages such as high specific energy, long cycle life, no memory effect, safety and reliability, and fast charging and discharging. In addition to being widely used in mobile phones, notebook computers and other digital electronic products, lithium-ion batteries are also used in electric vehicles; and the development of electric vehicles will also drive greater demand for lithium-ion batteries. The composition of lithium-ion batteries includes: positive electrode, negative electrode, separator and electrolyte. The battery separator refers to the polymer separator between the positive and negative electrodes of the lithium-ion bat...

Claims

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Application Information

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IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 樊孝红麻小挺
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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