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Battery insulation film

A technology of separator and battery, applied in battery pack parts, circuits, electrical components, etc.

Active Publication Date: 2011-10-05
重庆恩捷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Although CN 1954447A made the battery separator can basically meet the requirements, the performance of this separator, especially the average pore size and pore size distribution, still has room for improvement, so as to further improve its electrolyte wettability as a battery separator

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Divide 120 grams to a density of 2×10 6 High-density polyethylene (purchased from PetroChina Lanzhou Petrochemical Company), 100 grams of molecular weight is 2 million ultra-high molecular weight polyethylene (purchased from PetroChina Lanzhou Petrochemical Company), 1 gram of antioxidant 2,6 tert-butyl-4-methyl Phenol and 2000 grams of mineral oil (CAS8020-83-5, purchased from Lanzhou Petrochemical Company) with a viscosity grade of No. 39 were added to the continuous batching feeder, stirred at a speed of 55 rpm, and the raw materials were mixed evenly.

[0088] The mixture is continuously added to the twin-screw extruder; under the condition of 120°C, the ultra-high molecular weight polyethylene and high-density polyethylene are continuously dissolved in the mixture of mineral oil and antioxidant in the twin-screw extruder, and then The twin-screw extruder is continuously extruded at a speed of 200 rpm; the mixture is continuously input into the slit die; the mixture...

Embodiment 2

[0093] Divide 220 grams to a density of 2×10 6High-density polyethylene (purchased from PetroChina Lanzhou Petrochemical Company), 100 grams of ultra-high molecular weight polyethylene (purchased from PetroChina Lanzhou Petrochemical Company) with a molecular weight of 8 million, 1.2 grams of antioxidant 2, 6 tert-butyl-4-methyl Phenol and 2200 grams of mineral oil (CAS8020-83-5, purchased from Lanzhou Petrochemical Company) with a viscosity grade of No. 39 were added to the continuous batching feeder, stirred at a speed of 50 rpm, and the raw materials were mixed evenly.

[0094] The mixture is continuously added to the twin-screw extruder; under the condition of 120°C, the ultra-high molecular weight polyethylene and high-density polyethylene are continuously dissolved in the mixture of mineral oil and antioxidant in the twin-screw extruder, and then The twin-screw extruder is continuously extruded at a speed of 200 rpm; the mixture is continuously input into the slit die; t...

Embodiment 3

[0098] Divide 520 grams to a density of 2×10 6 High-density polyethylene (purchased from PetroChina Lanzhou Petrochemical Company), 100 grams of molecular weight is 3 million ultra-high molecular weight polyethylene (purchased from PetroChina Lanzhou Petrochemical Company), 1.5 grams of antioxidant 2,6 tert-butyl-4-methyl Phenol and 3,500 grams of viscosity grade mineral oil (CAS8020-83-5, purchased from Lanzhou Petrochemical Company) were added into the continuous batching feeder, and stirred at a speed of 50 rpm to mix the raw materials evenly.

[0099] The mixture is continuously added to the twin-screw extruder; under the condition of 120°C, the ultra-high molecular weight polyethylene and high-density polyethylene are continuously dissolved in the mixture of mineral oil and antioxidant in the twin-screw extruder, and then The twin-screw extruder is continuously extruded at a speed of 200 rpm; the mixture is continuously input into the slit die; the mixture is extruded thr...

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Abstract

The invention discloses a battery insulation film with a thickness of 16 to 35 [mu]m, a micropore size of 0.3 to 0.65 [mu]m, and a porosity of 40 to 50 %. The battery insulation film is produced with the following polymer compositions: (a) a mixture of ultrahigh molecular weight polyethylene with a molecular weight of 1.5*10<6> to 7.5*10<6> and high density polyethylene with a density of more than 0.945g / cm<3>, wherein a weight ratio of ultrahigh molecular weight polyethylene to high density polyethylene is 1:1 to 1:20; (b) 500 to 2000 parts of a pore forming agent by weight, when the weight of ultrahigh molecular weight polyethylene and high density polyethylene is regarded as 100 parts; and (c) 0.5 to 20 parts of an anti-oxidant, when the weight of ultrahigh molecular weight polyethylene and high density polyethylene is regarded as 100 parts.

Description

technical field [0001] The invention relates to a battery separator (especially a lithium-ion battery separator), which has excellent comprehensive properties, for example, the battery separator has a low average pore size, a more uniform pore size distribution, and a suitable closed cell temperature, membrane rupture temperature, good porosity and membrane strength, etc. Background technique [0002] The battery separator is one of the main materials of the battery. Its function is to separate the anode and cathode inside the battery to avoid short circuit, and also to allow ions to migrate smoothly through the separator between the two poles to form a current. When the work is abnormal, close the ion channel and cut off the current to ensure the safety of the battery. [0003] The battery separator is also called the battery separator, and its main properties include thickness, porosity, pore size, pore size distribution, strength, closed cell temperature and membrane rup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16C08J9/28C08L23/06
CPCY02E60/12Y02E60/10
Inventor 邓斌高翔李晓华李晓明
Owner 重庆恩捷新材料科技有限公司
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