CN108527970A - 一种用于锂离子电池的铝塑膜 - Google Patents

一种用于锂离子电池的铝塑膜 Download PDF

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CN108527970A
CN108527970A CN201710122602.8A CN201710122602A CN108527970A CN 108527970 A CN108527970 A CN 108527970A CN 201710122602 A CN201710122602 A CN 201710122602A CN 108527970 A CN108527970 A CN 108527970A
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aluminum plastic
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刘德刚
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Shenzhen Lingying New Materials Co Ltd
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    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
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Abstract

本发明适用于包装材料技术领域，提供了一种用于锂离子电池的铝塑膜，所述铝塑膜包括从外往内依次包覆的外保护层、铝层及树脂层，所述树脂层的组分包括EAA、PVA、PE、PA、TIE及PP中的至少一种。本发明提供的用于锂离子电池的铝塑膜，最外面的外保护层主要起保护作用，铝为基体材料，起防水和阻隔的作用。本发明实施例提供的用于锂离子电池的铝塑膜，深冲达6‑8mm，此外具有耐电解液、不分层等优点。

Description

一种用于锂离子电池的铝塑膜
技术领域
本发明属于包装材料技术领域，尤其涉及一种用于锂离子电池的铝塑膜。
背景技术
锂聚合物电池是锂电池中容量最高、重量最轻、安全性最高的电池，深受欢迎，移动智能设备也基本上均采用了聚合物软包电池，聚合物软包电池的重要组成部分之一是其软包装材料，即铝塑膜。而国内技术难度高，铝塑膜市场基本由日韩公司所垄断，日本昭和、DNP两家合计占85％的市场份额。
目前锂离子电池的发展有两个趋势：一个趋势是电池向小型化、薄型化的方向发展；一种是向大容量和大功率充放电的方向发展。前者要求所需的铝塑膜在阻隔性保证的前提下向更薄、更柔韧的方向发展；后者要求铝塑膜的阻隔性向更高的方向发展并且与电解液的相互作用的程度向更小的方向发展。这两种发展趋势，对铝塑膜材料的选择、对铝塑膜材料复合技术的要求、特别是对铝塑膜结构设计的要求更高。由于铝塑膜是电池成型的最后一道质量保证关口，对电池性能的影响又极大，因此，除了电池所需活性材料及制造工艺的进步之外，液态软包装锂离子电池的发展和应用领域的拓展，将主要取决于铝塑膜的发展。
然而，现有的铝塑膜存在深冲、耐电解液方面不过关的问题，急需改进。
发明内容
为解决上述技术问题，本发明提供了一种用于锂离子电池的铝塑膜。
本发明是这样实现的，一种用于锂离子电池的铝塑膜，所述铝塑膜包括从外往内依次包覆的外保护层、铝层及树脂层，所述树脂层的组分包括EAA、PVA、PE、PA、TIE及PP中的至少一种。
进一步地，所述树脂层的厚度为45～50μm。
进一步地，所述外保护层为尼龙薄膜，所述尼龙薄膜的厚度为23-26μm。
进一步地，所述尼龙薄膜的的表面张力大于48mN/m(达因)。
进一步地，所述铝层的厚度为38-42μm。
进一步地，所述外保护层与铝层之间设有第一粘和胶层，所述第一粘和胶层的组分为聚氨酯粘合剂。
进一步地，所述铝层和树脂层之间设有第二粘和胶层，所述第二粘和胶层的组分为聚氨酯粘合剂。
进一步地，所述铝塑膜的热封强度不低于25/15mm。
进一步地，所述树脂层包括按次序包覆的EAA层、TIE层、PVA层、PE层、TIE层、PE层、PVA层、PA层以及PP层。
进一步地，所述树脂层的成分为：
本发明与现有技术相比，有益效果在于：本发明实施例提供的用于锂离子电池的铝塑膜，所述铝塑膜包括从外往内依次包覆的外保护层、铝层及树脂层，最外面的外保护层主要起保护作用，铝为基体材料，起防水和阻隔的作用。由于锂电池是含大量腐蚀性有机溶剂的液体状物质，有溶解性、溶胀性和渗透性，所述树脂层选用EAA、TIE、PVA、PE、PA、PP等材料共挤流延而成的可热封共挤膜，可以直接跟电解液接触，是稳定性高、抗腐蚀能力强、防渗透性好的可热封薄膜。所述共挤膜可单独包装电解液，经80℃高温老化6天，测试不漏液，且不分层变形。所述树脂层将铝与锂离子电池的电芯隔开，防止泄露的部分液体腐蚀铝。本发明实施例提供的用于锂离子电池的铝塑膜，深冲达6-8mm，此外具有耐电解液、不分层等优点。
附图说明
图1是本发明实施例提供的铝塑膜的结构示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
参见图1，本发明实施例提供了一种用于锂离子电池的铝塑膜100，铝塑膜100包括从外往内依次包覆的外保护层1、铝层2及树脂层3，树脂层3的组分包括EAA(乙烯丙烯酸)、PVA(聚乙烯醇)、PE(聚乙烯)、PA(聚酰胺)、TIE粘合剂(行业内通用)及PP(聚丙烯)中至少一种。
锂电池是含大量腐蚀性有机溶剂的液体状物质，有溶解性、溶胀性和渗透性。本发明实施例提供的用于锂离子电池的铝塑膜，所述铝塑膜从外往内依次包括外保护层、铝层及树脂层，最外面的外保护层主要起保护作用，铝为基体材料，起防水和阻隔的作用。本发明实施例提供的用于锂离子电池的铝塑膜，深冲达6-8mm，此外具有耐电解液、不分层等优点。
具体地，树脂层3包括按次序包覆的EAA层、TIE层、PVA层、PE层、TIE层、PE层、PVA层、PA层以及PP层。
树脂层3由PA(30％)、EAA(10％)、PVA(25％)、TIE(8％)、PE(10％)、PP(17％)按次序EAA、TIE、PVA、PE、TIE、PE、PVA、PA、PP组成九层共挤流延而成的可热封共挤膜，可以直接跟电解液接触，是稳定性高、抗腐蚀能力强、防渗透性好的可热封薄膜。所述铝塑膜经80℃高温老化6天，测试不漏液，不分层，不变形，深冲达8mm。树脂层3将铝与锂离子电池的电芯隔开，防止泄露的部分液体腐蚀铝。
具体地，树脂层3的厚度为45～50μm。树脂层3的厚度适宜，可以进一步提高锂离子电池的相关性能。
具体地，外保护层1为尼龙薄膜，所述尼龙薄膜的厚度为23-26μm，优选25μm。所述尼龙薄膜的的表面张力大于48mN/m(达因)。所述尼龙薄膜的吸湿性强，必需在有干燥剂存在的密封袋包装并在干燥阴凉处保存，使用前没有受潮吸湿；其拉伸强度、断裂伸长率、耐撕裂力均比普尼龙性能参数更大，从而保证成型后的铝塑膜的深冲达深度8mm，深不变型，不打卷。
具体地，铝层2的厚度为38-42μm，优选40μm。铝层2为铝塑膜中间层，为基体材料，起防水和阻隔的作用。所述铝层为8系合金产品，表面干净，光亮，有很好的可塑性，可加工成各种形状。
具体地，外保护层1与铝层2之间设有第一粘和胶层4，第一粘和胶层4的组分为耐高温抗介质双组份聚氨酯粘合剂。铝层2和树脂层3之间设有第二粘和胶层5，第二粘和胶层5的组分为耐高温抗介质双组份聚氨酯粘合剂。第一粘4和胶层和第二粘和胶层5均选用软包装用高性能胶粘剂，采用该胶制造的铝塑膜，复合牢度较低、抗腐蚀力强。所述第一粘和胶层和第二粘和胶层的上胶量面层为3.5～4.0g/m2(干)，内层为4.3～4.8g/m2(干)，稀释溶剂的纯度为99.8％以上，复合好后在55～60℃固化48h，然后分切，再在70～80℃固化8～12h，即得。
本发明实施例提供的用于锂离子电池的铝塑膜100，所述铝塑膜的热封强度不低于25/15mm，耐高温达到120℃/30min。所述树脂层与电晕处理达52mN/m的表面张力的铝层及尼龙薄膜复合后，可有效满足锂离子电池的实用性能要求。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

1.一种用于锂离子电池的铝塑膜，其特征在于，所述铝塑膜包括从外往内依次包覆的外保护层、铝层及树脂层，所述树脂层的组分包括EAA、PVA、PE、PA、TIE及PP中的至少一种。
2.如权利要求1所述的铝塑膜，其特征在于，所述树脂层的厚度为45～50μm。
3.如权利要求1所述的铝塑膜，其特征在于，所述外保护层为尼龙薄膜，所述尼龙薄膜的厚度为23-26μm。
4.如权利要求3所述的铝塑膜，其特征在于，所述尼龙薄膜的的表面张力大于48mN/m。
5.如权利要求1所述的铝塑膜，其特征在于，所述铝层的厚度为38-42μm。
6.如权利要求1所述的铝塑膜，其特征在于，所述外保护层与铝层之间设有第一粘和胶层，所述第一粘和胶层的组分为聚氨酯粘合剂。
7.如权利要求1所述的铝塑膜，其特征在于，所述铝层和树脂层之间设有第二粘和胶层，所述第二粘和胶层的组分为聚氨酯粘合剂。
8.如权利要求1所述的铝塑膜，其特征在于，所述铝塑膜的热封强度不低于25/15mm。
9.如权利要求1至8任意一项所述的铝塑膜，其特征在于，所述树脂层包括按次序包覆的EAA层、TIE层、PVA层、PE层、TIE层、PE层、PVA层、PA层以及PP层。
10.如权利要求9所述的铝塑膜，其特征在于，所述树脂层的成分为
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Cited By (1)

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CN112757723A (zh) * 2021-01-25 2021-05-07 上海华峰新材料研发科技有限公司 一种铝塑复合板及其制备方法和应用

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