Flexible packaging film for lithium ion battery, and preparation method of flexible packaging film

A lithium-ion battery, flexible packaging film technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of lithium-ion battery failure, leakage, fire and other problems

Inactive Publication Date: 2019-03-12
EVE ENERGY CO LTD
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The middle material of the aluminum-plastic film is aluminum, and the soft-packed lithium-ion battery packaged with the aluminum-plastic film has always had the risk of electrochemical corrosion. The main reason is that the aluminum in the aluminum-plastic film is a conductor, and the aluminum-plastic The risk of short-circuiting between the aluminum layer in the film and the negative nickel tab, once the short-circuit occurs, it will provide an electronic channel for electrochemical...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Flexible packaging film for lithium ion battery, and preparation method of flexible packaging film
  • Flexible packaging film for lithium ion battery, and preparation method of flexible packaging film

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0055] see figure 2 , a preparation method of lithium-ion battery flexible packaging film, comprising the steps of:

[0056] S110, providing a solid core layer of polymer insulation.

[0057] By providing a solid core layer in the polymer insulation, as the middle layer of the lithium-ion battery flexible packaging film 10, it plays a good supporting role, and at the same time, due to its good insulation performance, it avoids short-circuiting with the tabs like aluminum foil. Problems, good barrier properties and puncture resistance, and good resistance to electrolyte stability, which can prevent the occurrence of electrochemical corrosion in soft-pack lithium-ion batteries.

[0058] In one of the embodiments, the thickness of the solid core layer in the polymer insulation is 20um-30um. It can be understood that the thickness of the solid core layer in the polymer insulation is smaller than that of the conventional aluminum-plastic film, which reduces the difficulty of pac...

Embodiment 1

[0076] Provide a PP layer with a thickness of 20um;

[0077] After heating the PET layer with a thickness of 10um, the PET layer is hot-pressed on one side of the PP layer with a pressure of 0.5Mpa;

[0078] After heating the PMMA layer with a thickness of 10um, the PMMA layer is hot pressed on the other side of the PP layer with a pressure of 0.5Mpa;

[0079] Under the temperature condition of 160°C, the polyurethane adhesive is melted, and the polyurethane adhesive is coated on the inner surface of the cast polypropylene film layer with a thickness of 15um while it is hot, and then the flow is passed through the polyurethane adhesive. The extended polypropylene film layer and the PET layer are bonded together, and after the polyurethane adhesive is cured, the first adhesive layer is obtained;

[0080] Under the temperature condition of 170°C, the polyurethane adhesive is melted, and the polyurethane adhesive is coated on the inner surface of the polyester resin layer with a...

Embodiment 2

[0083] Provide a PP layer with a thickness of 25um;

[0084] After heating the PMMA layer with a thickness of 15um, the PMMA layer is hot-pressed on one side of the PP layer with a pressure of 0.5Mpa;

[0085] After heating the ABS layer with a thickness of 10um, press the ABS layer on the other side of the PP layer while it is hot with a pressure of 1.5Mpa;

[0086] Under the temperature condition of 180°C, the epoxy resin adhesive is melted, and the epoxy resin adhesive is coated on the inner surface of the cast polypropylene film layer with a thickness of 20um, and then passed through The polyurethane adhesive bonds the cast polypropylene film layer and the PMMA layer together, and after the polyurethane adhesive is cured, the first adhesive layer is obtained;

[0087] Under the temperature condition of 180°C, the polyurethane adhesive is melted, and the polyurethane adhesive is coated on the inner surface of the polyester resin layer with a thickness of 20um while it is h...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Tensile strengthaaaaaaaaaa
Densityaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses a flexible packaging film for a lithium ion battery. The flexible packaging film comprises a cast polypropylene film layer, a first adhesive layer, a first rigid protective layer, a high molecular insulation middle cell fixing layer, a second rigid protective layer, a second adhesive layer and a polyester resin layer, wherein the first rigid protective layer and the secondrigid protective layer are thermally pressed on the two side surfaces of the high molecular insulation middle cell fixing layer respectively; the cast polypropylene film layer is adhered to the firstrigid protective layer through the first adhesive layer; and the polyester resin layer is adhered to the second rigid protective layer through the second adhesive layer. Therefore, the overall structure of the flexible packaging film of the lithium ion battery has good ductility and hardness; the formability is better; the use of a conductive material-aluminum foil is avoided; the possibilities ofshort-circuiting the packaging film and a negative electrode sheet and forming an ion channel and an electron channel are avoided; the possibility of electrochemical corrosion of the soft package lithium ion battery is avoided; and the safety and reliability of the soft package lithium ion battery are greatly improved.

Description

technical field [0001] The invention relates to the field of packaging films for lithium-ion batteries, in particular to a flexible packaging film for lithium-ion batteries and a preparation method thereof. Background technique [0002] Soft-pack lithium-ion battery refers to a liquid lithium-ion battery covered with a polymer shell, and the lithium-ion battery is structurally packaged with aluminum-plastic film. In the event of a safety hazard, the soft-pack lithium-ion battery will only burst at most. open. [0003] At present, the outer packaging film of soft-packed lithium-ion batteries is aluminum-plastic film, which is the key material for the packaging of soft-packed lithium-ion battery cells. After the single-chip battery is assembled, it is sealed with aluminum-plastic film to form a battery. To protect the contents. [0004] The middle material of the aluminum-plastic film is aluminum, and the soft-packed lithium-ion battery packaged with the aluminum-plastic fil...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M2/02H01M10/0525H01M50/124
CPCH01M10/0525H01M50/124Y02E60/10
Inventor 高回春邹友生张誉阮乐祥刘金成
Owner EVE ENERGY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap