Lithium-ion battery packaging housing and lithium ion battery comprising same

A lithium-ion battery and packaging shell technology, applied in the field of lithium-ion batteries, can solve the problems of reduced sealing performance, pinholes, cracks, affecting battery performance and working life, etc., to improve appearance, improve packaging reliability, and improve battery energy effect of density

Inactive Publication Date: 2016-04-20
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the corners and edges of the housing are stretched during the forming of the housing, and its thickness is reduced to 40% to 80% of the original thickness, and the aluminum foil layer will have defects such as pinholes and cracks, resulting in a decrease in sealing performance , affecting battery performance and working life

Method used

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  • Lithium-ion battery packaging housing and lithium ion battery comprising same
  • Lithium-ion battery packaging housing and lithium ion battery comprising same
  • Lithium-ion battery packaging housing and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Preparation of lithium-ion battery packaging shell:

[0068] 1. The sealing shell layer 3 made of homopolypropylene material with a thickness of 25 μm is used to make the size matching the bare cell 2 by pressing a film, and then seal it after wrapping the bare cell; the schematic diagram is as follows Figure 7 and 8 shown; as Figure 8 As shown, the thickness of the sealing shell at the folded edge and the folded corner is not less than its thickness at the plane;

[0069] 2. Using a vacuum evaporation method, a 15 μm aluminum metal coating layer 4 is formed on the outer surface of the sealing shell layer 3; the schematic diagram is as follows Figure 9 , 10 shown; as Figure 10 As shown, the thickness of the metal coating layer at the folded edge and the folded corner is not less than the thickness at the plane, and the arc surface formed by the sealing shell layer and the metal coating layer is a coaxial arc surface;

[0070] 3. Using a spraying process, the me...

Embodiment 2

[0073] Preparation of lithium-ion battery packaging shell:

[0074] 1. The sealed shell layer 3 made of homopolypropylene material with a thickness of 20 μm is made to match the size of the bare cell 2 through injection molding technology, and sealed after wrapping the bare cell;

[0075] 2. Cut off the sealing edge on one side and perform thermal shaping to eliminate the sealing edge on one side;

[0076] 3. Then use a vacuum evaporation method to form a 12 μm aluminum metal coating 4 on the outer surface of the sealing shell 3;

[0077] 4. Using a spraying process, the metal coating 4 is sprayed to form an 8 μm plastic coating layer 5 made of polyamide resin.

[0078] The thicknesses of the sealing shell layer, the metal coating layer and the plastic coating layer of the prepared lithium-ion battery package shell at the folded edge and the corner are the same as the thicknesses at the plane respectively, and the sealing shell layer, the metal coating layer and the plastic c...

Embodiment 3

[0081] The sealing shell layer 3 made of homopolypropylene material with a thickness of 30 μm is used to make a film shell matching the size of the bare cell by pressing the film technology, and the bare cell is wrapped and packaged, such as Figure 12 to Figure 14 shown. Such as Figure 14 As shown, the thickness of the sealing shell at the folded edge and the folded corner is the same as the thickness at the plane. Cut off each package edge and perform thermal shaping to remove the sealing area. Then, a metal coating layer 4 made of aluminum with a thickness of 15 μm was formed on the outer surface of the sealing shell layer 3 by using a vacuum evaporation method. Afterwards, a spraying process is adopted to spray and form a 15 μm plastic coating layer 5 made of polyamide resin on the metal coating 4, such as Figure 15 , Figure 16 shown. Such as Figure 16 As shown, the thicknesses of the sealing shell, metal coating layer and plastic coating layer at the folded edge...

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Abstract

The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery packaging housing, a preparation method and a lithium ion battery comprising the lithium ion battery packaging housing. A naked battery core of the lithium-ion battery is wrapped by the packaging housing, a sealing housing layer, a metal coating layer and a plastic coating layer are sequentially arranged from interior to exterior, the sealing housing layer wraps the naked battery core of the lithium-ion battery and is sealed, and then the metal coating layer and the plastic coating layer are sequentially arranged on the outer surface of the sealing housing layer. The materials of all the layers of the structure of the packaging housing are machined on the exterior of the lithium ion battery in the product manufacturing or packaging process, and packaging defects caused in a punching procedure are avoided when the thickness and the strength of folding positions and corners of the product are kept constant, so that the product packaging reliability is greatly improved, the housing does not have tensile deformation or wrinkling, appearance defects are avoided, the product appearance is improved, and the battery energy density is increased.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, in particular, to a lithium-ion battery packaging case and a lithium-ion battery containing the packaging case. Background technique [0002] Traditional lithium-ion batteries use a packaging composite film made of nylon film, aluminum foil and sealing material through extrusion and compounding as the casing material. In the battery manufacturing process, the packaging composite film is made into a battery shell through a stamping process, and then the bare battery is wrapped and then the battery is packaged and made into a battery. During stamping and forming, the shell will be stretched and extruded, and the shell will become thinner in stretched areas such as corners, and correspondingly, its nylon layer, aluminum foil layer and sealing material layer will also become thinner. Usually, the corners and edges of the housing are stretched during the forming of the housing, and its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M10/0525H01M50/105H01M50/119H01M50/121H01M50/124H01M50/129H01M50/133H01M50/186H01M50/193
CPCH01M10/0525H01M50/124H01M50/1245H01M50/193H01M50/186H01M50/105H01M50/129H01M50/119H01M50/121H01M50/133Y02E60/10H01M50/131
Inventor 耿继斌方宏新段栋郭培培
Owner NINGDE AMPEREX TECH
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