CN111421915B - 一种抗形变的锂电池用包装膜 - Google Patents

一种抗形变的锂电池用包装膜 Download PDF

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CN111421915B
CN111421915B CN202010367275.4A CN202010367275A CN111421915B CN 111421915 B CN111421915 B CN 111421915B CN 202010367275 A CN202010367275 A CN 202010367275A CN 111421915 B CN111421915 B CN 111421915B
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CN111421915A (zh
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吕松
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Changzhou Sveck Photovoltaic New Material Co ltd
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Abstract

本发明涉及电池包装膜技术领域，尤其是一种抗形变的锂电池用包装膜，包括依次层叠设置的尼龙层、第一粘合层、铝箔层、第二粘合层、加强层和热封层，所述尼龙层和第一粘合层的连接面呈波浪形，所述尼龙层与第一粘合层的接触面上还设有若干凸起，所述铝箔层的上表面和下表面呈粗糙状，所述第二粘合层和加强层的连接面呈波浪形，所述加强层与热封层的接触面呈波浪形；本发明中的包装膜中表层尼龙层在第一粘合层上呈波浪形设置，在使用过程中，包装膜受热膨胀或降温收缩时，波浪形的尼龙层结构可以有效的起到缓冲作用，从而避免包装膜长期使用后发生褶皱或者是尼龙层表层发生脱层现象。

Description

一种抗形变的锂电池用包装膜
技术领域
本发明涉及电池包装膜技术领域，尤其是一种抗形变的锂电池用包装膜。
背景技术
软包电池的包装材料和结构使其拥有一系列优势，比如，安全性能好，软包电池在结构上采用铝塑膜包装，发生安全问题时，软包电池一般会鼓气裂开，而不像钢壳或铝壳电芯那样发生爆炸；重量轻，软包电池重量较同等容量的钢壳锂电池轻40%，较铝壳锂电池轻20%；内阻小，软包电池的内阻较锂电池小，可以极大的降低电池的自耗电；循环性能好，软包电池的循环寿命更长，100次循环衰减比铝壳少4%～7%；设计灵活，外形可变任意形状，可以更薄，可根据客户的需求定制，开发新的电芯型号。
现有的软包装膜，由于其自身结构的缺陷，导致其相对来说还比较发生形变，例如，包装膜内部各层之间发生脱层现象，或者局部由于受热发生收缩，造成包装膜的表面发生褶皱。
发明内容
本发明的目的是：克服现有技术中不足，提供一种粘合强度高、长时间使用后表面不会发生褶皱现象的抗形变的锂电池用包装膜。
为解决上述技术问题，本发明采用的技术方案如下：
一种抗形变的锂电池用包装膜，包括依次层叠设置的尼龙层、第一粘合层、铝箔层、第二粘合层、加强层和热封层，所述尼龙层和第一粘合层的连接面呈波浪形，所述尼龙层与第一粘合层的接触面上还设有若干凸起，所述铝箔层的上表面和下表面呈粗糙状，所述第二粘合层和加强层的连接面呈波浪形，所述加强层与热封层的接触面呈波浪形。
进一步的，所述第一粘合层和第二粘合层的厚度为200-300nm。
进一步的，所述铝箔层的上表面和下表面上分别有无铬钝化液处理的耐腐蚀层，所述耐腐蚀层的厚度为300-500nm。
进一步的，所述铝箔层的厚度为100μm。
进一步的，所述加强层采用波浪形状的尼龙层，所述尼龙层的上表面和下表面分别设有若干凸起，所述尼龙层外包覆有一层聚丙烯层，所述聚丙烯层的厚度为4-5μm。
进一步的，所述聚丙烯层内填充有玻璃纤维，所述玻璃纤维的添加量为聚丙烯层质量的1-2%。
进一步的，所述热封层选用EVA胶膜和聚氨酯改性环氧树脂中的一种。
进一步的，所述热封层的厚度为20-30μm。
采用本发明的技术方案的有益效果是：
本发明中的包装膜中表层尼龙层在第一粘合层上呈波浪形设置，在使用过程中，包装膜受热膨胀或降温收缩时，波浪形的尼龙层结构可以有效的起到缓冲作用，从而避免包装膜长期使用后发生褶皱或者是尼龙层表层发生脱层现象。铝箔层的表面设计成粗糙状，提高了铝箔层与其他层之间的连接稳定性，第二粘合层和加强层的连接面呈波浪形，加强层在使用过程中热胀冷缩时，波浪形结构可以有效的缓冲加强层的形变，避免加强层中的尼龙层发生收缩，影响加强层的保护性以及包装膜的整体性，不会在某一层出现收缩。
具体实施方式
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合具体实施方式对本发明作进一步详细的说明。
一种抗形变的锂电池用包装膜，包括依次层叠设置的尼龙层、第一粘合层、铝箔层、第二粘合层、加强层和热封层，所述尼龙层和第一粘合层的连接面呈波浪形，所述尼龙层与第一粘合层的接触面上还设有若干凸起，所述铝箔层的上表面和下表面呈粗糙状，所述第二粘合层和加强层的连接面呈波浪形，所述加强层与热封层的接触面呈波浪形。本发明中的包装膜中表层尼龙层在第一粘合层上呈波浪形设置，在使用过程中，包装膜受热膨胀或降温收缩时，波浪形的尼龙层结构可以有效的起到缓冲作用，从而避免包装膜长期使用后发生褶皱或者是尼龙层表层发生脱层现象。铝箔层的表面设计成粗糙状，提高了铝箔层与其他层之间的连接稳定性，第二粘合层和加强层的连接面呈波浪形，加强层在使用过程中热胀冷缩时，波浪形结构可以有效的缓冲加强层的形变，避免加强层中的尼龙层发生收缩，影响加强层的保护性以及包装膜的整体性，不会在某一层出现收缩。
作为一个优选实施方式，本实施例中的第一粘合层和第二粘合层的厚度为200-300nm。
作为一个优选实施方式，本实施例中的铝箔层的上表面和下表面上分别有无铬钝化液处理的耐腐蚀层，所述耐腐蚀层的厚度为300-500nm。
作为一个优选实施方式，本实施例中的铝箔层的厚度为100μm。
作为一个优选实施方式，本实施例中的加强层采用波浪形状的尼龙层，所述尼龙层的上表面和下表面分别设有若干凸起，所述尼龙层外包覆有一层聚丙烯层，所述聚丙烯层的厚度为4-5μm，波浪形结构可以有效的缓冲加强层的形变，避免加强层中的尼龙层发生收缩，影响加强层的保护性以及包装膜的整体性，不会在某一层出现收缩，凸起的结构设计，进一步提高了加强层与其他层之间的连接强度。
作为一个优选实施方式，本实施例中的聚丙烯层内填充有玻璃纤维，所述玻璃纤维的添加量为聚丙烯层质量的1-2%，玻璃纤维可以进一步提高聚丙烯层的抗拉伸强度和刚性。
作为一个优选实施方式，本实施例中的热封层选用EVA胶膜和聚氨酯改性环氧树脂中的一种。
作为一个优选实施方式，本实施例中的热封层的厚度为20-30μm。
实施例1
一种抗形变的锂电池用包装膜，包括依次层叠设置的尼龙层、第一粘合层、铝箔层、第二粘合层、加强层和热封层，所述尼龙层和第一粘合层的连接面呈波浪形，第一粘合层和第二粘合层的厚度为200nm，所述尼龙层与第一粘合层的接触面上还设有若干凸起，所述铝箔层的上表面和下表面呈粗糙状，所述第二粘合层和加强层的连接面呈波浪形，所述加强层与热封层的接触面呈波浪形，加强层采用波浪形状的尼龙层，所述尼龙层的上表面和下表面分别设有若干凸起，所述尼龙层外包覆有一层聚丙烯层，聚丙烯层内填充有玻璃纤维，所述玻璃纤维的添加量为聚丙烯层质量的1%，所述聚丙烯层的厚度为4μm；铝箔层的上表面和下表面上分别有无铬钝化液处理的耐腐蚀层，所述耐腐蚀层的厚度为300nm，铝箔层的厚度为100μm，热封层选用EVA胶膜，所述热封层的厚度为20-30μm。
实施例2
一种抗形变的锂电池用包装膜，包括依次层叠设置的尼龙层、第一粘合层、铝箔层、第二粘合层、加强层和热封层，所述尼龙层和第一粘合层的连接面呈波浪形，第一粘合层和第二粘合层的厚度为210nm，所述尼龙层与第一粘合层的接触面上还设有若干凸起，所述铝箔层的上表面和下表面呈粗糙状，所述第二粘合层和加强层的连接面呈波浪形，所述加强层与热封层的接触面呈波浪形，加强层采用波浪形状的尼龙层，所述尼龙层的上表面和下表面分别设有若干凸起，所述尼龙层外包覆有一层聚丙烯层，聚丙烯层内填充有玻璃纤维，所述玻璃纤维的添加量为聚丙烯层质量的1.2%，所述聚丙烯层的厚度为4.2μm；铝箔层的上表面和下表面上分别有无铬钝化液处理的耐腐蚀层，所述耐腐蚀层的厚度为350nm，铝箔层的厚度为100μm，热封层选用EVA胶膜，所述热封层的厚度为22μm。
实施例3
一种抗形变的锂电池用包装膜，包括依次层叠设置的尼龙层、第一粘合层、铝箔层、第二粘合层、加强层和热封层，所述尼龙层和第一粘合层的连接面呈波浪形，第一粘合层和第二粘合层的厚度为280nm，所述尼龙层与第一粘合层的接触面上还设有若干凸起，所述铝箔层的上表面和下表面呈粗糙状，所述第二粘合层和加强层的连接面呈波浪形，所述加强层与热封层的接触面呈波浪形，加强层采用波浪形状的尼龙层，所述尼龙层的上表面和下表面分别设有若干凸起，所述尼龙层外包覆有一层聚丙烯层，聚丙烯层内填充有玻璃纤维，所述玻璃纤维的添加量为聚丙烯层质量的1.5%，所述聚丙烯层的厚度为4.5μm；铝箔层的上表面和下表面上分别有无铬钝化液处理的耐腐蚀层，所述耐腐蚀层的厚度为400nm，铝箔层的厚度为100μm，热封层选用EVA胶膜，所述热封层的厚度为25μm。
实施例4
一种抗形变的锂电池用包装膜，包括依次层叠设置的尼龙层、第一粘合层、铝箔层、第二粘合层、加强层和热封层，所述尼龙层和第一粘合层的连接面呈波浪形，第一粘合层和第二粘合层的厚度为280nm，所述尼龙层与第一粘合层的接触面上还设有若干凸起，所述铝箔层的上表面和下表面呈粗糙状，所述第二粘合层和加强层的连接面呈波浪形，所述加强层与热封层的接触面呈波浪形，加强层采用波浪形状的尼龙层，所述尼龙层的上表面和下表面分别设有若干凸起，所述尼龙层外包覆有一层聚丙烯层，聚丙烯层内填充有玻璃纤维，所述玻璃纤维的添加量为聚丙烯层质量的1.7%，所述聚丙烯层的厚度为4.6μm；铝箔层的上表面和下表面上分别有无铬钝化液处理的耐腐蚀层，所述耐腐蚀层的厚度为460nm，铝箔层的厚度为100μm，热封层选用聚氨酯改性环氧树脂，所述热封层的厚度为26μm。
实施例5
一种抗形变的锂电池用包装膜，包括依次层叠设置的尼龙层、第一粘合层、铝箔层、第二粘合层、加强层和热封层，所述尼龙层和第一粘合层的连接面呈波浪形，第一粘合层和第二粘合层的厚度为300nm，所述尼龙层与第一粘合层的接触面上还设有若干凸起，所述铝箔层的上表面和下表面呈粗糙状，所述第二粘合层和加强层的连接面呈波浪形，所述加强层与热封层的接触面呈波浪形，加强层采用波浪形状的尼龙层，所述尼龙层的上表面和下表面分别设有若干凸起，所述尼龙层外包覆有一层聚丙烯层，聚丙烯层内填充有玻璃纤维，所述玻璃纤维的添加量为聚丙烯层质量的2%，所述聚丙烯层的厚度为5μm；铝箔层的上表面和下表面上分别有无铬钝化液处理的耐腐蚀层，所述耐腐蚀层的厚度为500nm，铝箔层的厚度为100μm，热封层选用聚氨酯改性环氧树脂，所述热封层的厚度为30μm。
本发明中的包装膜中表层尼龙层在第一粘合层上呈波浪形设置，在使用过程中，包装膜受热膨胀或降温收缩时，波浪形的尼龙层结构可以有效的起到缓冲作用，从而避免包装膜长期使用后发生褶皱或者是尼龙层表层发生脱层现象。铝箔层的表面设计成粗糙状，提高了铝箔层与其他层之间的连接稳定性，第二粘合层和加强层的连接面呈波浪形，加强层在使用过程中热胀冷缩时，波浪形结构可以有效的缓冲加强层的形变，避免加强层中的尼龙层发生收缩，影响加强层的保护性以及包装膜的整体性，不会在某一层出现收缩。
以上述依据本发明的理想实施例为启示，通过上述的说明内容，相关工作人员完全可以在不偏离本项发明技术思想的范围内，进行多样的变更以及修改。凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。本项发明的技术性范围并不局限于说明书上的内容，必须要根据权利要求范围来确定其技术性范围。

Claims (6)

1.一种抗形变的锂电池用包装膜，其特征在于：包括依次层叠设置的尼龙层、第一粘合层、铝箔层、第二粘合层、加强层和热封层，所述尼龙层和第一粘合层的连接面呈波浪形，所述尼龙层与第一粘合层的接触面上还设有若干凸起，所述铝箔层的上表面和下表面呈粗糙状，所述第二粘合层和加强层的连接面呈波浪形，所述加强层与热封层的接触面呈波浪形；
所述加强层采用波浪形状的尼龙层，所述尼龙层的上表面和下表面分别设有若干凸起，所述尼龙层外包覆有一层聚丙烯层，所述聚丙烯层的厚度为4-5μm；
所述聚丙烯层内填充有玻璃纤维，所述玻璃纤维的添加量为聚丙烯层质量的1-2%。
2.根据权利要求1所述的一种抗形变的锂电池用包装膜，其特征在于：所述第一粘合层和第二粘合层的厚度为200-300nm。
3.根据权利要求1所述的一种抗形变的锂电池用包装膜，其特征在于：所述铝箔层的上表面和下表面上分别有无铬钝化液处理的耐腐蚀层，所述耐腐蚀层的厚度为300-500nm。
4.根据权利要求1所述的一种抗形变的锂电池用包装膜，其特征在于：所述铝箔层的厚度为100μm。
5.根据权利要求1所述的一种抗形变的锂电池用包装膜，其特征在于：所述热封层选用EVA胶膜和聚氨酯改性环氧树脂中的一种。
6.根据权利要求1所述的一种抗形变的锂电池用包装膜，其特征在于：所述热封层的厚度为20-30μm。
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