CN104466040B - 一种锂电池封装用铝塑膜及其制造工艺 - Google Patents
一种锂电池封装用铝塑膜及其制造工艺 Download PDFInfo
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Abstract
本发明涉及一种锂电池封装用铝塑膜，包括从内到外依次排列的CPP层(1)、内粘结层(2)、铝箔层(3)和含氟元素的透明涂层(4)，所述的含氟元素的透明涂层(4)包括氟元素改性的耐高温丙烯酸涂层、氟元素改性的耐高温聚氨酯涂层、FEVE涂层或PVDF涂层。本发明也提供了锂电池封装用铝塑膜的制造工艺。该铝塑膜在封装注入电解液过程中，接触意外滴落的电解液，不会出现被腐蚀的现象，并且增强了薄膜外表面的滑爽性。
Description
技术领域
本发明属于锂电池封装生产领域，具体涉及一种锂电池封装用铝塑膜及其制造工艺。
背景技术
锂电池封装用铝塑膜用于电池封装，克服了长期以来硬质材料封装电池带来的安全隐患：气胀引起的电池爆炸。一直以来，锂电池用封装铝塑膜研发厂家只关注材料的冲深性能，对铝塑膜外层的易腐蚀弊端不加以重视，造成在注电解液过程中，不小心滴落的电解液对铝塑膜外层腐蚀，降低了电池整体的阻隔性和介电系数，而且也影响美观。
发明内容
为了克服上述缺陷，本发明的目的在于提供一种锂电池封装用铝塑膜及其制造工艺，能够避免电解液对铝塑膜外层的腐蚀。
为了实现上述目的，本发明所采用的技术方案为：一种锂电池封装用铝塑膜，包括从内到外依次排列的CPP层、内粘结层、铝箔层和含氟元素的透明涂层，所述的含氟元素的透明涂层包括氟元素改性的耐高温丙烯酸涂层、氟元素改性的耐高温聚氨酯涂层、FEVE涂层或PVDF涂层。
所述的氟元素改性的耐高温丙烯酸涂层、氟元素改性的耐高温聚氨酯涂层经过表层处理，该处理工艺为等离子处理、电晕处理、钠化处理或化学涂层处理。
所述的含氟元素的透明涂层厚度10μm-50μm，其中15μm-40μm为佳。
所述的铝箔厚度20μm-80μm，其中以30-50微米为佳，且铝箔断裂伸长率大于12%更佳。
本发明提供一种制造锂电池封装用铝塑膜的工艺，包含如下的步骤：
1) 在铝箔的两侧先做表面处理，光面做防腐蚀处理，亚光面做增加表面张力处理；
2)按照环氧树脂改性的氟树脂涂层B：固化剂B=100：19的质量比例混合，同时加入80%相应质量的丁酮，搅拌混合均匀；
3)在铝箔的哑光面涂布B体系的涂层，湿膜厚度35μm-50μm；
4)烘道温度设置为80-100-90℃的温度梯度，铝箔按照5M/min的速度在烘道中运行，确保收卷完好；
5)半成品在80℃-100℃的熟化室内熟化16小时-24小时；
6)按照聚氨酯体系胶黏剂A：固化剂A=100：25的质量比例混合胶黏剂，同时加入100%相应质量份的乙酸乙酯，搅拌混合均匀；
7)在铝箔的亮光面涂布A体系的涂层，湿膜厚度12μm-25μm；
8)烘道温度设置为50-100-90℃的温度梯度，按照10M/min的速度在烘道中进行半固化；
9)通过90℃的光面滚轴使CPP与铝箔复合；
10) 半成品在50℃-100℃的熟化室内熟化48小时-96小时，得到成品。
本发明的有益效果是：该铝塑膜在封装注入电解液过程中，接触意外滴落的电解液，不会出现被腐蚀的现象，并且增强了薄膜外表面的滑爽性。
附图说明
图1是本发明锂电池封装用铝塑膜的结构示意图。
具体实施方式
下面结合附图1对本发明进行进一步描述，本发明的保护范围包括但不限此。
在本发明中用英文字母表示的材料的中文名称如下：CPP-流延聚丙烯；FEVE-氟烯烃-乙烯基醚共聚物；PVDF-聚偏氟乙烯。
如图1所示，本发明一种锂电池封装用铝塑膜，包括从内到外依次排列的CPP层1、内粘结层2、铝箔层3和含氟元素的透明涂层4，所述的含氟元素的透明涂层4包括氟元素改性的耐高温丙烯酸涂层、氟元素改性的耐高温聚氨酯涂层、FEVE涂层或PVDF涂层。
氟元素改性的耐高温丙烯酸涂层、氟元素改性的耐高温聚氨酯涂层经过表层处理，该处理工艺为等离子处理、电晕处理、钠化处理或化学涂层处理。
含氟元素的透明涂层4厚度10μm-50μm，以厚度为15μm-40μm最佳。
铝箔层3厚度为20μm-80μm，其中以30-50微米为佳，且铝箔断裂伸长率大于12%更佳。
在下面实施例中，材料的选择如下：
聚氨酯体系胶黏剂A（高盟公司）：固含量60%
固化剂A（高盟公司）：固含量75%
环氧树脂改性的氟树脂体系涂层B（杜邦公司）：固含量48%
固化剂B（杜邦公司）：固含量75%
溶剂：乙酸乙酯，丁酮，甲苯
铝箔（中铝）：厚度40μm，断裂伸长率13%
CPP：80μm。
实施例
本发明的锂电池封装用铝塑膜的制造工艺如下：
1)采用铝箔，在铝箔的两侧先做表面处理，光面做防腐蚀处理，亚光面做增加表面张力处理；
2)按照环氧树脂改性的氟树脂涂层B：固化剂B=100：19的比例混合，同时加入80%相应质量的丁酮，搅拌混合均匀；
3)在铝箔的哑光面涂布B体系的涂层，湿膜厚度35μm-50μm；
4)烘道温度设置为80-100-90℃的温度梯度，铝箔按照5M/min的速度在烘道中运行，确保收卷完好；
5)半成品在80℃-100℃的熟化室内熟化16小时-24小时；
6)按照聚氨酯体系胶黏剂A：固化剂A=100：25的比例混合胶黏剂，同时加入100%相应质量份的乙酸乙酯，搅拌混合均匀；
7)在铝箔的亮光面涂布A体系的涂层，湿膜厚度12μm-25μm；
8)烘道温度设置为50-100-90℃的温度梯度，按照10M/min的速度在烘道中进行半固化；
9)通过90℃的光面滚轴使CPP与铝箔的复合；
10)半成品在50℃-100℃的熟化室内熟化48小时-96小时，得到成品。
本发明制得的表层耐电解液腐蚀的锂电池封装用铝塑膜，其冲深性能达到6mm，表层滑爽性佳，且不会被滴露的电解液侵蚀。
本发明的 表层耐电解液腐蚀的锂电池封装用铝塑膜多用于电脑、手机、平板电池以及汽车电池的生产制造中。
Claims (1)
1.一种锂电池封装用铝塑膜的制造工艺，其特征在于，包含如下的步骤：
1)在铝箔的两侧做表面处理，光面做防腐蚀处理，亚光面做增加表面张力处理；
2)按照环氧树脂改性的氟树脂涂层B：固化剂B=100：19的质量比例混合，同时加入80%相应质量的丁酮，搅拌混合均匀；
3)在铝箔的亚光面涂布B体系的涂层，湿膜厚度35μm-50μm；
4)烘道温度设置为80-100-90℃的温度梯度，铝箔按照5m/min的速度在烘道中运行，确保收卷完好；
5)半成品在80℃-100℃的熟化室内熟化16小时-24小时；
6)按照聚氨酯体系胶黏剂A：固化剂A=100：25的质量比例混合胶黏剂，同时加入100%相应质量份的乙酸乙酯，搅拌混合均匀；
7)在铝箔的亮光面涂布A体系的涂层，湿膜厚度12μm-25μm；
8)烘道温度设置为50-100-90℃的温度梯度，按照10m/min的速度在烘道中进行半固化；
9)通过90℃的光面滚轴使CPP与铝箔复合；
10) 半成品在50℃-100℃的熟化室内熟化48小时-96小时，得到成品。
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