CN111430580A - 一种双pp-al组合型铝塑膜及其制造方法 - Google Patents
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Abstract
本发明涉及一种双PP‑AL组合型聚合物锂离子电池铝塑膜及其制造方法。该铝塑膜从内到外依次包括第一聚丙烯层、第一胶层、第一铝箔层、第二聚丙烯层、第二胶层、第二铝箔层、第三胶层、尼龙层;本发明利用双PP‑AL组合的特征,很好地解决了内层PP‑AL出现电解液腐蚀穿透时外层PP‑AL可进行二次保护,提高了铝塑膜的耐蚀性和阻隔性的强度值,可满足铝塑膜封装聚合物锂离子电池。
Description
技术领域
本发明涉及聚合物锂离子电池封装材料领域,特别涉及一种双PP-AL组合型铝塑膜。
背景技术
聚合物锂离子电池是未来锂离子电池发展的主要方向,如何保证、稳定及提高聚合物锂离子电池的性能是相关电池厂家十分关心的重要问题。电池性能的好坏不仅与电池内部的电解质、隔膜、正负极材料有关,还与聚合物锂离子电池的封装铝塑膜有十分密切的联系。
聚合物锂离子电池最后是通过铝塑膜封装形成成品电池,封装铝塑膜质量的好坏对成品电池的各项性能均具有重要影响,若铝塑膜的质量不过关,电池中水、氧含量达到一定程度或出现铝箔腐蚀、穿孔等现象时,聚合物锂离子电池的容量将变小、电压降增大,电池充放电和循环寿命均呈现快速下降,严重时甚至会导致电池快速失效,因此电池封装铝塑膜材料一般要求具有极高的热封性能、阻隔性能和耐腐蚀性能,因此如何研制热封性能、阻隔性能及耐腐蚀性能各项指标均优异的锂电池封装铝塑膜对电池的稳定运行均具有十分重要的意义。
发明内容
为解决上述技术问题,本发明提供一种双PP-AL组合型铝塑膜,该铝塑膜具有高的热封性能、阻隔性能和耐腐蚀性能,用此铝塑膜可做成消费电池及动力电池产品。
本发明的技术方案为:一种双PP-AL组合型铝塑膜,该铝塑膜包括第一聚丙烯层、第一胶层、第一铝箔层、第二聚丙烯层、第二胶层、第二铝箔层、第三胶层、尼龙层。
作为本发明的一种优选方案,所述第一聚丙烯层和第二聚丙烯层的厚度为20-80μm。
作为本发明的一种优选方案,所述所述第一胶层、第二胶层和第三胶层的厚度为1-20μm。
作为本发明的一种优选方案,所述第一铝箔层和第二铝箔层的厚度为30-100μm。
作为本发明的一种优选方案,所述尼龙层厚度为5-45μm。
一种双PP-AL组合型铝塑膜及其制造方法,其特征在于,包括以下步骤:
(1)第一铝箔层与第一聚丙烯层通过热熔胶膜层压进行热复合,分别得到PP-AL复合材料I和II;
(2)将PP-AL非复合面进行常温等离子处理,常温净化环境下保存备用;
(3)将PP-AL复合材料I的AL非复合面与PP-AL复合材料II的PP非复合面通过热熔胶层压进行复合,得到PP-AL组合型复合体;
(4)将该PP-AL组合型复合体的AL非复合面与PA通过热熔胶膜层压复合,得到成品铝塑膜。
采用上述技术方案后,本发明的有益效果是:首先,该铝塑膜通过PP-AL双组合层可有效阻止电池内部电解液对铝塑膜中的多层铝箔进行完全穿透腐蚀;其次,多层铝箔不仅可以提高铝塑膜整体的耐腐蚀能力,同时铝箔材料自身的稳定性可阻止氧、水对电池电解液的侵蚀效应,产品综合性能优良,适合消费类电池及动力电池产品的封装应用。
附图说明
图1为本发明的结构示意图。
其中,第一聚丙烯层1、第一胶层2、第一铝箔层3、第二聚丙烯层4、第二胶层5、第二铝箔层6、第三胶层7、尼龙层8。
具体实施方式
下面结合具体实施方式,进一步阐明本发明。
实施例
如图1所示,本发明提供了一种多涂氟层型聚合物锂离子电池铝塑膜,包括第一聚丙烯层1、第一胶层2、第一铝箔层3、第二聚丙烯层4、第二胶层5、第二铝箔层6、第三胶层7、尼龙层8。
所述铝塑膜由内到外依次为第一聚丙烯层1、第一胶层2、第一铝箔层3、第二聚丙烯层4、第二胶层5、第二铝箔层6、第三胶层7、尼龙层8。
所述聚丙烯层的厚度为20-80μm。
所述胶粘层的厚度为1-20μm。
所述铝箔层的厚度为30-100μm。
所述尼龙层厚度为5-45μm。
一种双PP-AL组合型铝塑膜及其制造方法,其特征在于,包括以下步骤:
(1)铝箔层与聚丙烯层通过热熔胶膜层压进行热复合,分别得到PP-AL复合材料I和II;
(2)将PP-AL非复合面进行常温等离子处理,常温净化环境下保存备用;
(3)将PP-AL复合材料I的AL非复合面与PP-AL复合材料II的PP非复合面通过热熔胶层压进行复合,得到PP-AL组合型复合体;
(4)将该PP-AL组合型复合体的AL非复合面与PA通过热熔胶膜层压复合,得到成品铝塑膜。
本发明的产品经过测定达到以下指标:
1.层间剥离强度及耐腐蚀性测定:根据《GB/T 8808-1988软质复合塑料材料剥离试验方法》测定标准,层间剥离强大于22N/15mm;铝塑膜在85℃电解液浸泡4小时后,层间剥离强度大于10N/15mm;铝塑膜深冲成型做成电芯,注入电解液后密封,在60℃,90%RH的下存放14天,层间剥离强度大于10N/15mm;
2.材料深冲性能测定:根据《Q/320507LD001-2016锂电池封装铝塑膜》测定标准,深冲深度达到8.5mm以上;
3.热封性能测定:根据《QB/T 2358-1998塑料薄膜包装袋热封强度试验方法》测定标准,在热封温度180℃-200℃的条件,热封强度达80N/15mm以上。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以作出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (6)
1.一种双PP-AL组合型聚合物锂离子电池铝塑膜,其特征在于,从内到外依次包括第一聚丙烯层1、第一胶层2、第一铝箔层3、第二聚丙烯层4、第二胶层5、第二铝箔层6、第三胶层7、尼龙层8。
2.根据权利要求1中所述的一种双PP-AL组合型聚合物锂离子电池铝塑膜,其特征在于,所述第一聚丙烯层和第二聚丙烯层的厚度为20-80μm。
3.根据权利要求1中所述的一种双PP-AL组合型聚合物锂离子电池铝塑膜,所述第一胶层、第二胶层和第三胶层的厚度为1-20μm。
4.根据权利要求1中所述的一种双PP-AL组合型聚合物锂离子电池铝塑膜,所述第一铝箔层和第二铝箔层的厚度为30-100μm。
5.根据权利要求1中所述的一种双PP-AL组合型聚合物锂离子电池铝塑膜,所述尼龙层厚度为5-45μm。
6.一种双PP-AL组合型铝塑膜及其制造方法,其特征在于,包括以下步骤:
(1)第一铝箔层3与第一聚丙烯层1通过热熔胶膜层压进行热复合,第二铝箔层6与第二聚丙烯4通过热熔胶膜层压进行热复合,分别得到PP-AL复合材料I和II;
(2)将PP-AL非复合面进行常温等离子处理,常温净化环境下保存备用;
(3)将PP-AL复合材料I的AL非复合面与PP-AL复合材料II的PP非复合面通过热熔胶层压进行复合,得到PP-AL组合型复合体;
(4)将该PP-AL组合型复合体的AL非复合面与PA通过热熔胶膜层压复合,得到成品铝塑膜。
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