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Laminating member used for battery outer packaging

A technology for battery outer packaging and laminates, applied to battery pack parts, lamination, lamination devices, etc., can solve the problems of poor corrosion resistance, fracture, peeling, etc., and achieve the effect of reducing defects

Active Publication Date: 2014-07-02
FUJIMORI KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since chromium, a heavy metal, is used in chromate treatment, it is not preferable from the viewpoint of environmental protection
In addition, chemical conversion treatments other than chromate treatment are less effective in improving corrosion resistance
[0009] Also, when the existing aluminum laminated film is deep-drawn or folded, the corners or bends are stretched and may eventually reach the stretching limit and break, resulting in pinholes or cracks
In addition, the bonded surface between the aluminum foil and the substrate layer may be peeled off due to the influence of stress during stretching
Due to the occurrence of such defects during molding, the production efficiency of storage containers such as lithium-ion batteries decreases

Method used

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  • Laminating member used for battery outer packaging
  • Laminating member used for battery outer packaging
  • Laminating member used for battery outer packaging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064]A substrate layer with a thickness of 25 μm made of polyamide (nylon) resin and an aluminum foil with a thickness of 40 μm are laminated through a 7 μm adhesive layer made of a urethane-based adhesive (including an epoxy-based adhesive). pressure.

[0065] On the surface of the innermost layer side of this aluminum foil, an amorphous polymer (manufactured by Nippon Synthetic Chemicals Co., Ltd., trade name: G Polymer Resin) having a hydroxyl group-containing polyvinyl alcohol skeleton dissolved in 3 wt% was coated with a thickness of 1 μm and An aqueous solution of 1 wt% chromium (III) fluoride was laminated with a film coating layer, and further heat-dried in an oven at 200°C.

[0066] Further, on the film coating layer of aluminum foil with 3g / m 2 An acid-denatured polypropylene-based heat-sealing agent was applied, and a 30 μm polypropylene layer was laminated thereon, whereby the battery exterior laminate 10 of Example 1 was produced.

[0067] A test piece for meas...

Embodiment 2

[0070] On the surface of the innermost layer side of the aluminum foil, an amorphous polymer (manufactured by Nippon Synthetic Chemicals Co., Ltd., trade name: G polymer resin) and 1 wt% dissolved with 3 wt% polyvinyl alcohol skeleton containing hydroxyl groups were coated with a thickness of 3 μm. % chromium (III) fluoride aqueous solution, laminated film coating layer, and further heat-dried in an oven at 200°C.

[0071] The thermal change of the heat-treated thin-film coating layer was measured by a differential thermal analyzer, and the melting point of the thin-film coating layer was confirmed. As a result, there was no peak in the melting point, indicating that the resin was cross-linked. Figure 4 shows the results of measuring the thin film coating layer using a differential thermal analyzer. Additionally, if Figure 4 As shown, the thermal change of the film coating layer that was not heat-treated by an oven was also measured as a comparison object.

[0072] Further...

Embodiment 3

[0084] Pass a polyethylene terephthalate (PET) film with a thickness of 5 μm and a polyamide (nylon) film with a thickness of 25 μm at a rate of 3 g / m 2 The substrate layer and the aluminum foil in which the applied urethane adhesive layer was laminated were bonded via a 7 μm urethane adhesive layer containing an epoxy adhesive. Then, on the surface of the aluminum foil opposite to the base material layer, a non-crystalline polymer (manufactured by Nippon Synthetic Chemicals Co., Ltd., trade name: G Polymer) having a hydroxyl group-containing polyvinyl alcohol skeleton dissolved in 3 μm thickness is coated. Resin) and the aqueous solution of 1wt% chromium (III) fluoride, and carry out heat treatment under 200 ℃ of temperature and form film coating layer, on film coating layer, with 3g / m 2 An acid-denatured polypropylene-based heat-sealing agent was applied, and then a 40 μm polypropylene layer was heat-laminated to prepare the laminate for battery outer packaging of Example 3 ...

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Abstract

PROBLEM TO BE SOLVED: To provide a laminate for battery exterior package in which drop in laminate strength between an aluminum foil and an innermost layer and occurrence of delamination, due to deterioration of electrolyte in a lithium ion battery, are suppressed, and which can produce an exterior package in high yield.SOLUTION: In the laminate 10 for battery exterior package formed by laminating an aluminum foil and a resin layer sequentially, a base material layer 11, an aluminum foil 12, and an innermost layer 13 including a polypropylene or polyethylene layer are laminated in order. On at lease a surface of the innermost layer of the aluminum foil 12, a thin film coating layer 14 including resin having a skeleton of polyvinyl alcohol containing a hydroxyl group or copolymer resin thereof is laminated. The thin film coating layer 14 is crosslinked with a thin film coating layer which includes a resin containing a metal fluoride or its derivative and having a skeleton of polyvinyl alcohol containing a hydroxyl group, or includes copolymer resin of the resin. And the thin film coating layer 14 includes a substance which passivates a surface of the aluminum foil.

Description

technical field [0001] The present invention relates to a battery outer packaging laminate used as an outer packaging material for secondary batteries such as lithium ion batteries and electric double layer capacitors (hereinafter referred to as capacitors). [0002] This application claims priority based on the Japanese invention patent application with the filing date of July 30, 2010 and the application number of 2010-172265, and its content is cited in this application. Background technique [0003] In recent years, with the deepening of global environmental problems, the spread of electric vehicles and the effective use of natural energy such as wind power generation and solar power generation have become issues. Accordingly, in these technical fields, secondary batteries such as lithium ion batteries and capacitors are attracting attention as storage batteries for storing electric energy. In addition, as outer packaging containers for lithium-ion batteries used in ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/02H01M2/08B32B15/08B32B15/20B32B7/12B32B15/085H01G11/00H01G11/78
CPCY02E60/13Y02E60/10B32B15/08B32B15/20B32B37/12B32B2255/06B32B2255/26B32B2311/24B32B2457/10H01G11/78
Inventor 饭塚宏和武井邦浩山田雅子松山岳生
Owner FUJIMORI KOGYO CO LTD