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Method for producing pp/pe/pp lithium battery power diaphragm by casting method

A technology of lithium battery and casting method, used in secondary batteries, battery pack parts, circuits, etc., can solve the problems of poor diaphragm strength, general polyolefin strength, poor thermal stability of polyolefin, etc., to achieve process repeatability and Good stability, simple processing method, and the effect of meeting the requirements of use

Active Publication Date: 2022-05-27
JIESHOU CITY TIANHONG PACKAGING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the separator mainly uses polyolefin as the raw material for processing, but the strength of polyolefin is average, and the performance of the prepared separator is not high, especially the high-temperature rupture temperature and high-temperature puncture strength cannot meet the requirements of power batteries, so it can only be used for mobile phones. , cameras and other small electrical appliances
Moreover, the thermal stability of polyolefin is poor, and there are potential safety hazards when used in power batteries
In order to improve the thermal stability of the separator, people try to add inorganic materials to polyolefin, but the compatibility of inorganic materials and polyolefin is poor, the film forming process is difficult, and the strength of the obtained separator is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Raw material preparation: PP material includes 2kg homopolypropylene and 0.2kg syndiotactic polypropylene, and PE material includes 2kg high density polyethylene and 0.05kg titanate coupling agent;

[0045] (2) Melt extrusion: use a twin-screw extruder to melt and extrude the PP material. The temperature of each zone is 170 °C in zone I, 180 °C in zone II, 190 °C in zone III, 190 °C in zone IV, 200 °C in zone V, and the die head 200°C; at the same time, another twin-screw extruder is used to melt and extrude the PE material, and the temperature of each zone is 160°C in zone I, 170°C in zone II, 170°C in zone III, 175°C in zone IV, 190°C in zone V, and 190°C in die head. , and then transport the molten material to the co-extrusion die;

[0046] (3) Co-extrusion casting: The inlet distributor of the co-extrusion die divides the PP material melt into two PP layers as the surface layer, and uses the PE material melt as the middle layer, which is merged at the exit of th...

Embodiment 2

[0051] The heat setting time in Example 1 was adjusted to 30min, and the rest were the same as in Example 1.

[0052] (1) Raw material preparation: PP material includes 2kg homopolypropylene and 0.2kg syndiotactic polypropylene, and PE material includes 2kg high density polyethylene and 0.05kg titanate coupling agent;

[0053](2) Melt extrusion: use a twin-screw extruder to melt and extrude the PP material. The temperature of each zone is 170 °C in zone I, 180 °C in zone II, 190 °C in zone III, 190 °C in zone IV, 200 °C in zone V, and the die head 200°C; at the same time, another twin-screw extruder is used to melt and extrude the PE material, and the temperature of each zone is 160°C in zone I, 170°C in zone II, 170°C in zone III, 175°C in zone IV, 190°C in zone V, and 190°C in die head. , and then transport the molten material to the co-extrusion die;

[0054] (3) Co-extrusion casting: The inlet distributor of the co-extrusion die divides the PP material melt into two PP la...

Embodiment 3

[0059] The titanate coupling agent in Example 1 was replaced with polyhexamethylene adipamide, and the rest were the same as those in Example 1.

[0060] (1) Raw material preparation: PP material includes 2kg homopolypropylene and 0.2kg syndiotactic polypropylene, and PE material includes 2kg high density polyethylene and 0.05kg polyhexamethylene adipamide;

[0061] (2) Melt extrusion: use a twin-screw extruder to melt and extrude the PP material. The temperature of each zone is 170 °C in zone I, 180 °C in zone II, 190 °C in zone III, 190 °C in zone IV, 200 °C in zone V, and the die head 200°C; at the same time, another twin-screw extruder is used to melt and extrude the PE material, and the temperature of each zone is 160°C in zone I, 170°C in zone II, 170°C in zone III, 175°C in zone IV, 190°C in zone V, and 190°C in die head. , and then transport the molten material to the co-extrusion die;

[0062] (3) Co-extrusion casting: The inlet distributor of the co-extrusion die di...

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PUM

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Abstract

The invention discloses a method for producing a PP / PE / PP lithium battery power diaphragm by casting method, relates to the technical field of lithium battery diaphragm processing, and comprises the following steps: (1) raw material preparation; (2) melt extrusion; (3) ) co-extrusion casting; (4) stretching; (5) heat shrinkage; (6) heat setting. The invention uses polypropylene and polyethylene as main raw materials to prepare PP / PE / PP lithium battery power separators by co-extrusion casting method, the thickness of the prepared separators reaches 20-30 μm, the raw materials are easy to obtain, the processing method is simple, and the process repeatability and good stability; and the prepared separator has good thermal stability, especially high puncture strength at high temperature, high membrane rupture temperature, and good thermal shrinkage, thereby meeting the use requirements of high-performance lithium batteries.

Description

Technical field: [0001] The invention relates to the technical field of lithium battery diaphragm processing, in particular to a method for producing a PP / PE / PP lithium battery power diaphragm by a casting method, which is an innovative engineering project for new energy vehicles and intelligent networked vehicles. Background technique: [0002] In lithium-ion batteries, the separator is mainly used for the conduction of lithium ions, and separates the positive and negative electrodes inside the battery from each other to prevent the battery from self-discharge and short-circuit between the two poles, and plays a certain role in safety protection. Thermal stability is an important performance index of the separator. Poor separator stability can lead to overheating of the battery and explosion due to the melting and rupture of the separator. The thermal stability of the separator in the battery is determined by the closed cell temperature and the membrane breaking temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/457H01M50/414H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411Y02E60/10
Inventor 吴磊张德顺胡伟李汪洋何祥燕杨建军张建安陈曼刘久逸吴明元彭盼盼王若愚吴庆云孙晓华朱江森吴爱平郭浩
Owner JIESHOU CITY TIANHONG PACKAGING MATERIAL