CN111244336A - 一种耐冲击锂电池用软包装膜 - Google Patents
一种耐冲击锂电池用软包装膜 Download PDFInfo
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Abstract
本发明涉及电池包装膜技术领域，尤其是一种耐冲击锂电池用软包装膜，包括耐冲击保护层、第一粘合层、铝箔层、第二粘合层、加强层、第三粘合层和热封层，所述耐冲击保护层的材料为改性聚苯乙烯，所述改性聚苯乙烯中橡胶的添加量为聚苯乙烯质量的10‑16%，所述加强层的材料为填充有短玻璃纤维的尼龙层，所述热封层为EVA树脂层，所述EVA树脂层的厚度为30‑60μm；本发明中的耐冲击保护层在受到冲击时，裂纹扩展的尖端应力会被相对柔软的橡胶颗粒释放掉，阻止裂纹的扩展，提高保护层的抗冲击性，同时采用填充有短玻璃纤维的尼龙层作为加强层，两者配合使用，进一步提高了软包装膜的耐冲击性，提高了锂离子电池的使用安全性。
Description
技术领域
本发明涉及电池包装膜技术领域，尤其是一种耐冲击锂电池用软包装膜。
背景技术
电池用软包装膜一般为铝塑膜，通常有三层，尼龙层是保证了铝塑膜的外形，减轻对外壳的损伤，保证在制造成锂离子电池之前，膜不会发生变形，阻止空气尤其是氧的渗透,维持电芯内部的环境,同时保证包装铝箔具备良好的形变能力。Al层就是一层金属Al构成，其作用是防止水的渗入，维持电芯内部的环境具有一定的厚度强度能够防止外部对电芯的损伤。锂离子电池很怕水，一般要求极片含水量都在PPM级，所以包装膜一定能够挡住水气的渗入。
但是软包装膜还存在一个缺陷就是耐冲击性差，包装后的电池在使用过程中若受到外力冲击，造成电解液泄露的安全隐患。
发明内容
本发明的目的是：克服现有技术中不足，提供一种耐冲击性强、对电池的保护力强的耐冲击锂电池用软包装膜。
为解决上述技术问题，本发明采用的技术方案如下：
一种耐冲击锂电池用软包装膜，包括耐冲击保护层、第一粘合层、铝箔层、第二粘合层、加强层、第三粘合层和热封层，所述耐冲击保护层的材料为改性聚苯乙烯，所述改性聚苯乙烯中橡胶的添加量为聚苯乙烯质量的10-16%，所述加强层的材料为填充有短玻璃纤维的尼龙层，所述热封层为EVA树脂层，所述EVA树脂层的厚度为30-60μm。
进一步的，第一粘合层和第二粘合层的材料为聚酰亚胺胶黏剂，所述第一粘合层和第二粘合层的厚度为2-5μm。
进一步的，所述铝箔层的上表面和下表面有耐腐蚀性层，所述耐腐蚀性层采用无铬钝化液处理得到。
进一步的，所述无铬钝化液的质量份组成如下：二氧化钛0.6-0.8份、鞣酸0.8-1.2份、磷脂脂肪酸0.3-0.5份、环氧树脂0.5-0.8份、水100份。
进一步的，所述无铬钝化液的质量份组成如下：二氧化钛0.7份、鞣酸1份、磷脂脂肪酸0.4份、环氧树脂0.6份、水100份。
进一步的，所述加强层中短玻璃纤维的添加量为尼龙质量的1-3%。
进一步的，所述铝箔层的上表面设有若干凹槽，下表面分别呈粗糙状，所述凹槽呈圆锥形。
进一步的，所述凹槽的深度为200-600nm。
采用本发明的技术方案的有益效果是：
耐冲击性聚苯乙烯是在聚苯乙烯中添加聚丁烯橡胶颗粒，聚苯乙烯中添加微米级橡胶颗粒并通过接枝的方法把聚苯乙烯和橡胶颗粒连接在一起，当受到冲击时，裂纹扩展的尖端应力会被相对柔软的橡胶颗粒释放掉，阻止裂纹的扩展，提高保护层的抗冲击性，同时采用填充有短玻璃纤维的尼龙层作为加强层，两者配合使用，进一步提高了软包装膜的耐冲击性，提高了锂离子电池的使用安全性。
本发明中铝箔层的上表面设有若干凹槽，下表面分别呈粗糙状，凹槽呈圆锥形，提高了铝箔层与其他层之间的连接强度，从而进一步提高了软包装膜的耐冲击性，使用更安全。
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。
一种耐冲击锂电池用软包装膜，包括耐冲击保护层、第一粘合层、铝箔层、第二粘合层、加强层、第三粘合层和热封层，所述耐冲击保护层的材料为改性聚苯乙烯，所述改性聚苯乙烯中橡胶的添加量为聚苯乙烯质量的10-16%，所述加强层的材料为填充有短玻璃纤维的尼龙层，所述热封层为EVA树脂层，所述EVA树脂层的厚度为30-60μm。耐冲击性聚苯乙烯是在聚苯乙烯中添加聚丁烯橡胶颗粒，聚苯乙烯中添加微米级橡胶颗粒并通过接枝的方法把聚苯乙烯和橡胶颗粒连接在一起，当受到冲击时，裂纹扩展的尖端应力会被相对柔软的橡胶颗粒释放掉，阻止裂纹的扩展，提高保护层的抗冲击性，同时采用填充有短玻璃纤维的尼龙层作为加强层，两者配合使用，进一步提高了软包装膜的耐冲击性，提高了锂离子电池的使用安全性。
作为一个优选实施方式，本实施例中第一粘合层和第二粘合层的材料为聚酰亚胺胶黏剂，所述第一粘合层和第二粘合层的厚度为2-5μm。
作为一个优选实施方式，本实施例中铝箔层的上表面和下表面有耐腐蚀性层，所述耐腐蚀性层采用无铬钝化液处理得到，采用无铬钝化液对铝箔层进行处理，处理液更环保，在铝箔层表面形成的耐腐蚀层的耐腐蚀性更好。
作为一个优选实施方式，本实施例中无铬钝化液的质量份组成如下：二氧化钛0.6-0.8份、鞣酸0.8-1.2份、磷脂脂肪酸0.3-0.5份、环氧树脂0.5-0.8份、水100份。
作为一个优选实施方式，本实施例中无铬钝化液的质量份组成如下：二氧化钛0.7份、鞣酸1份、磷脂脂肪酸0.4份、环氧树脂0.6份、水100份。
作为一个优选实施方式，本实施例中加强层中短玻璃纤维的添加量为尼龙质量的1-3%。
作为一个优选实施方式，本实施例中铝箔层的上表面设有若干凹槽，下表面分别呈粗糙状，所述凹槽呈圆锥形，采用此结构设计，提高了铝箔层与其他层之间的连接强度，从而进一步提高了软包装膜的耐冲击性，使用更安全。
作为一个优选实施方式，本实施例中凹槽的深度为200-600nm。
实施例1
一种耐冲击锂电池用软包装膜，包括耐冲击保护层、第一粘合层、铝箔层、第二粘合层、加强层、第三粘合层和热封层，所述耐冲击保护层的材料为改性聚苯乙烯，所述改性聚苯乙烯中橡胶的添加量为聚苯乙烯质量的10%，所述加强层的材料为填充有短玻璃纤维的尼龙层，所述热封层为EVA树脂层，所述EVA树脂层的厚度为30μm；第一粘合层和第二粘合层的材料为聚酰亚胺胶黏剂，所述第一粘合层和第二粘合层的厚度为2μm；所述铝箔层的上表面和下表面有耐腐蚀性层，所述耐腐蚀性层采用无铬钝化液处理得到；加强层中短玻璃纤维的添加量为尼龙质量的1%，铝箔层的上表面设有若干凹槽，下表面分别呈粗糙状，所述凹槽呈圆锥形，凹槽的深度为200-600nm。
其中，无铬钝化液的质量份组成如下：二氧化钛0.6份、鞣酸0.8份、磷脂脂肪酸0.3份、环氧树脂0.5份、水100份。
实施例2
一种耐冲击锂电池用软包装膜，包括耐冲击保护层、第一粘合层、铝箔层、第二粘合层、加强层、第三粘合层和热封层，所述耐冲击保护层的材料为改性聚苯乙烯，所述改性聚苯乙烯中橡胶的添加量为聚苯乙烯质量的12%，所述加强层的材料为填充有短玻璃纤维的尼龙层，所述热封层为EVA树脂层，所述EVA树脂层的厚度为35μm；第一粘合层和第二粘合层的材料为聚酰亚胺胶黏剂，所述第一粘合层和第二粘合层的厚度为3μm；所述铝箔层的上表面和下表面有耐腐蚀性层，所述耐腐蚀性层采用无铬钝化液处理得到；加强层中短玻璃纤维的添加量为尼龙质量的1.5%，铝箔层的上表面设有若干凹槽，下表面分别呈粗糙状，所述凹槽呈圆锥形，凹槽的深度为300nm。
其中，无铬钝化液的质量份组成如下：二氧化钛0.6份、鞣酸0.9份、磷脂脂肪酸0.3份、环氧树脂0.5份、水100份。
实施例3
一种耐冲击锂电池用软包装膜，包括耐冲击保护层、第一粘合层、铝箔层、第二粘合层、加强层、第三粘合层和热封层，所述耐冲击保护层的材料为改性聚苯乙烯，所述改性聚苯乙烯中橡胶的添加量为聚苯乙烯质量的12%，所述加强层的材料为填充有短玻璃纤维的尼龙层，所述热封层为EVA树脂层，所述EVA树脂层的厚度为45μm；第一粘合层和第二粘合层的材料为聚酰亚胺胶黏剂，所述第一粘合层和第二粘合层的厚度为3μm；所述铝箔层的上表面和下表面有耐腐蚀性层，所述耐腐蚀性层采用无铬钝化液处理得到；加强层中短玻璃纤维的添加量为尼龙质量的2%，铝箔层的上表面设有若干凹槽，下表面分别呈粗糙状，所述凹槽呈圆锥形，凹槽的深度为400nm。
其中，无铬钝化液的质量份组成如下：二氧化钛0.7份、鞣酸1份、磷脂脂肪酸0.4份、环氧树脂0.6份、水100份。
实施例4
一种耐冲击锂电池用软包装膜，包括耐冲击保护层、第一粘合层、铝箔层、第二粘合层、加强层、第三粘合层和热封层，所述耐冲击保护层的材料为改性聚苯乙烯，所述改性聚苯乙烯中橡胶的添加量为聚苯乙烯质量的10-16%，所述加强层的材料为填充有短玻璃纤维的尼龙层，所述热封层为EVA树脂层，所述EVA树脂层的厚度为50μm；第一粘合层和第二粘合层的材料为聚酰亚胺胶黏剂，所述第一粘合层和第二粘合层的厚度为4μm；所述铝箔层的上表面和下表面有耐腐蚀性层，所述耐腐蚀性层采用无铬钝化液处理得到；加强层中短玻璃纤维的添加量为尼龙质量的2.5%，铝箔层的上表面设有若干凹槽，下表面分别呈粗糙状，所述凹槽呈圆锥形，凹槽的深度为500nm。
其中，无铬钝化液的质量份组成如下：二氧化钛0.7份、鞣酸1份、磷脂脂肪酸0.4份、环氧树脂0.7份、水100份。
实施例5
一种耐冲击锂电池用软包装膜，包括耐冲击保护层、第一粘合层、铝箔层、第二粘合层、加强层、第三粘合层和热封层，所述耐冲击保护层的材料为改性聚苯乙烯，所述改性聚苯乙烯中橡胶的添加量为聚苯乙烯质量的16%，所述加强层的材料为填充有短玻璃纤维的尼龙层，所述热封层为EVA树脂层，所述EVA树脂层的厚度为60μm；第一粘合层和第二粘合层的材料为聚酰亚胺胶黏剂，所述第一粘合层和第二粘合层的厚度为5μm；所述铝箔层的上表面和下表面有耐腐蚀性层，所述耐腐蚀性层采用无铬钝化液处理得到；加强层中短玻璃纤维的添加量为尼龙质量的3%，铝箔层的上表面设有若干凹槽，下表面分别呈粗糙状，所述凹槽呈圆锥形，凹槽的深度为600nm。
其中，无铬钝化液的质量份组成如下：二氧化钛0.8份、鞣酸1.2份、磷脂脂肪酸0.5份、环氧树脂0.8份、水100份。
耐冲击性聚苯乙烯是在聚苯乙烯中添加聚丁烯橡胶颗粒，聚苯乙烯中添加微米级橡胶颗粒并通过接枝的方法把聚苯乙烯和橡胶颗粒连接在一起，当受到冲击时，裂纹扩展的尖端应力会被相对柔软的橡胶颗粒释放掉，阻止裂纹的扩展，提高保护层的抗冲击性，同时采用填充有短玻璃纤维的尼龙层作为加强层，两者配合使用，进一步提高了软包装膜的耐冲击性，提高了锂离子电池的使用安全性。
本发明中铝箔层的上表面设有若干凹槽，下表面分别呈粗糙状，凹槽呈圆锥形，提高了铝箔层与其他层之间的连接强度，从而进一步提高了软包装膜的耐冲击性，使用更安全。
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 (8)
1.一种耐冲击锂电池用软包装膜，其特征在于：包括耐冲击保护层、第一粘合层、铝箔层、第二粘合层、加强层、第三粘合层和热封层，所述耐冲击保护层的材料为改性聚苯乙烯，所述改性聚苯乙烯中橡胶的添加量为聚苯乙烯质量的10-16%，所述加强层的材料为填充有短玻璃纤维的尼龙层，所述热封层为EVA树脂层，所述EVA树脂层的厚度为30-60μm。
2.根据权利要求1所述的一种耐冲击锂电池用软包装膜，其特征在于：第一粘合层和第二粘合层的材料为聚酰亚胺胶黏剂，所述第一粘合层和第二粘合层的厚度为2-5μm。
3.根据权利要求1所述的一种耐冲击锂电池用软包装膜，其特征在于：所述铝箔层的上表面和下表面有耐腐蚀性层，所述耐腐蚀性层采用无铬钝化液处理得到。
4.根据权利要求3所述的一种耐冲击锂电池用软包装膜，其特征在于：所述无铬钝化液的质量份组成如下：二氧化钛0.6-0.8份、鞣酸0.8-1.2份、磷脂脂肪酸0.3-0.5份、环氧树脂0.5-0.8份、水100份。
5.根据权利要求4所述的一种耐冲击锂电池用软包装膜，其特征在于：所述无铬钝化液的质量份组成如下：二氧化钛0.7份、鞣酸1份、磷脂脂肪酸0.4份、环氧树脂0.6份、水100份。
6.根据权利要求1所述的一种耐冲击锂电池用软包装膜，其特征在于：所述加强层中短玻璃纤维的添加量为尼龙质量的1-3%。
7.根据权利要求1所述的一种耐冲击锂电池用软包装膜，其特征在于：所述铝箔层的上表面设有若干凹槽，下表面分别呈粗糙状，所述凹槽呈圆锥形。
8.根据权利要求7所述的一种耐冲击锂电池用软包装膜，其特征在于：所述凹槽的深度为200-600nm。
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