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Power lithium battery flexible packaging film

A flexible packaging film, lithium battery technology, applied in the direction of lithium battery, battery pack parts, non-aqueous electrolyte battery, etc. Effect

Active Publication Date: 2021-04-13
JIESHOU CITY TIANHONG PACKAGING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many domestic companies have developed research and development, but so far no products have been launched on the market

Method used

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  • Power lithium battery flexible packaging film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The specific preparation process of the middle layer of modified aluminum foil is as follows:

[0038] Step S1, placing 2.5 mmol of high-purity aluminum, 1.1 mmol of rare earth lanthanum, and 3 mmol of iron powder in a furnace to melt the alloy, pouring the liquid alloy into a mold for alloy casting, and obtaining an ingot;

[0039] Step S2, placing the ingot prepared in step S1 in a resistance furnace for homogenization treatment at 600°C for 12 hours, then cooling to room temperature, and performing hot rolling, cold rolling and foil rolling on the ingot after face milling, and then annealing After 2 hours, it was pressed into a 0.06mm sheet-shaped modified aluminum foil middle layer, wherein the hot rolling temperature was 510°C, the cold rolling temperature was 480°C, and the annealing temperature was 350°C.

Embodiment 2

[0041] The specific preparation process of the modified PET outer layer is as follows:

[0042] Step C1, add 10g caprolactam, 100mL concentrated hydrochloric acid, 5mg organotin catalyst, 150mL deionized water into the flask, heat to reflux for 2 hours, and prepare 6-aminocaproic acid hydrochloride after cooling, wherein the mass fraction of concentrated hydrochloric acid is 37.5 %, the heating temperature is 120°C;

[0043] Step C2, add 20g of sodium montmorillonite and 60mL of deionized water into the reaction kettle, heat and stir for 2 hours, then add the 6-aminocaproic acid hydrochloride prepared in step C1, stir at constant temperature for 12-16 hours, and cool to room temperature , fully washed with 40 mL of absolute ethanol, filtered and discarded the filtrate, and the filter residue was dried in a vacuum oven to constant weight, and ground to obtain 6-aminocaproic acid hydrochloride modified montmorillonite;

[0044] Step C3, add 200g of terephthalic acid, 100g of et...

Embodiment 3

[0050] The specific preparation process of the micro-crosslinked polypropylene inner layer is as follows:

[0051] Step F1, adding ternary copolymerized polypropylene, homopolymerized polypropylene, mixed polypropylene, crosslinking agent, initiator, and graphene into the reaction kettle, and fully mechanically stirring and mixing after heating to obtain a mixture, wherein the ternary The parts by weight of copolymerized polypropylene, homopolypropylene, mixed polypropylene, crosslinking agent, initiator, and graphene are 12 parts of ternary copolymerized polypropylene, 8 parts of homopolypropylene, 10 parts of mixed polypropylene, crosslinking agent 3 parts, 3 parts of initiator, 4 parts of graphene, the crosslinking agent is pentaerythritol tetraacrylate, the initiator is dicumyl peroxide, the heating temperature is 200 ° C, and the stirring rate is 200 rpm;

[0052] In step F2, the mixture prepared in step F1 is subjected to double-screw extrusion, the rotating speed of the...

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Abstract

The invention discloses a power lithium battery flexible packaging film, which comprises the following raw materials in parts by weight: 20-26 parts of a micro-cross-linked polypropylene inner layer, 15-18 parts of a modified aluminum foil middle layer, 10-15 parts of a modified PET outer layer, 3-6 parts of an adhesive and 3-6 parts of a primer, and is prepared from the cross-linked polypropylene inner layer, the modified aluminum foil middle layer and the modified PET outer layer through a hot-pressing laminating process. According to the invention, modification is carried out based on the multi-layer aluminum-plastic composite film, macroscopically, effective compounding of the modified PET outer layer, the modified aluminum foil middle layer and the micro-crosslinked polypropylene inner layer is realized, and in microstructure, doping compounding of organic and inorganic elements is realized, so that the performance requirements of corrosion resistance and high ductility of the power lithium battery flexible package film are met, and the barrier capacity of the power lithium battery flexible package film to oxygen and moisture is also improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries and relates to a flexible packaging film for power lithium batteries. Background technique [0002] According to data from the China Association of Automobile Manufacturers, sales of new energy vehicles are expected to exceed 2 million in 2020. For new energy vehicles, especially pure electric vehicles, the performance indicators such as the capacity and safety of the key components of power lithium batteries are constantly improving. Compared with the current traditional steel and aluminum packaging of power lithium batteries, the soft packaging of power lithium batteries has the following advantages: 1) Good safety performance, unlike steel and aluminum packaging that will explode; 2) Light weight, relatively The steel shell with the same capacity is 40% lighter than the aluminum shell; 3) Large capacity, 10-15% higher than the steel shell battery of the same size, and 5-10% higher th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/129H01M10/052
CPCH01M10/052Y02E60/10
Inventor 胡伟周正发任凤梅吴磊张伟李汪洋孙晓华徐凤锦刘志强郭浩
Owner JIESHOU CITY TIANHONG PACKAGING MATERIAL
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