CN103700789B - 聚合物锂离子电池软包装膜及其制备方法 - Google Patents
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Abstract
本发明公开了聚合物锂离子电池软包装膜及其制备方法，自外侧向内侧依次包括聚酰胺层和铝箔层，其特征在于，在所述铝箔层内侧依次设置有防止铝箔层受到电解液腐蚀的双酚A型环氧树脂防腐涂层和阻隔水气的防水汽渗透涂层，在所述防水汽渗透涂层和聚合物锂离子电池之间还设置有BOPP阻隔层。提高了隔绝水汽的性能，增强了其耐外层水汽的渗透和内层电解液的腐蚀，有效的提高电池使用寿命和使用安全性。而且其制备方法简单，工艺条件成熟。
Description
技术领域
本发明涉及一种聚合物锂离子电池软包装膜及其制备方法。
背景技术
聚合物锂离子电池在全球技术成熟并商业化多年，随着移动电器本身向小型化、薄化方向发展以方便消费者的携带，聚合物锂离子电池正被越来越多的便携电子设备以及可佩戴保健电器等设计人员所认识。其具有众多优点，比如安全性能好、厚度小、重量轻、容量大……
在实际使用过程中，因为外部水蒸气进入聚合物锂离子电池内部，电解液中六氟磷酸锂盐与水反应能生成有害的氢氟酸，同时当水蒸气进入时，作为粘合隔膜层所用的PVDF在NMP的催化作用下，能够发生脱HF酸反应，强酸的生成使得铝箔溶解，电池软包装膜失效。
发明内容
针对上述问题，本发明提供一种聚合物锂离子电池软包装膜及其制备方法，可有效阻隔水汽和腐蚀性气体，提高软包装膜的抗腐蚀强度，从而提高电池的使用寿命。
为实现上述技术目的，达到上述技术效果，本发明通过以下技术方案实现：
聚合物锂离子电池软包装膜，自外侧向内侧依次包括聚酰胺层和铝箔层，其特征在于，在所述铝箔层内侧依次设置有防止铝箔层受到电解液腐蚀的双酚A型环氧树脂防腐涂层和阻隔水气的防水汽渗透涂层，在所述防水汽渗透涂层和聚合物锂离子电池之间还设置有BOPP阻隔层。
其中聚酰胺层是最外层的保护层，具有优良的耐磨性和耐穿刺性。铝箔层由一种软质的具有优良延展性的单面光铝箔构成，双酚A型环氧树脂防腐涂层固化后形成介于环氧树脂链和橡胶链之间的互穿网状高分子防腐涂层，进而有效地防止涂层的变化，能有效的防护铝箔层受到电解液腐蚀，双酚A型环氧树脂防腐涂层还具有极强的附着力、耐候性、耐水性、耐久性等性能，防水汽渗透涂层可以吸收水气和减弱电解液产生的腐蚀性气体，起到增强水气阻隔的效果，BOPP阻隔层是一种采用管膜法生产的双向拉伸BOPP，具有较高的热封强度，且有一定的水汽和氧气阻隔性。本结构的聚合物锂离子电池软包装膜大大提高了隔绝水汽的性能，增强了其耐外层水汽的渗透和内层电解液的腐蚀，有效的提高电池使用寿命。
上述的聚合物锂离子电池软包装膜的制备方法是：包括如下步骤：
S1：将单面光铝箔层电晕处理后在其亮面涂布一层双酚A型环氧树脂防腐涂层；
S2：将聚己内酰胺膜进行电晕处理后在其表面涂一层胶黏剂；
S3：在BOPP膜上涂覆一层氟化钠涂层，在氟化钠涂层上涂上胶黏剂；
S4：将步骤S2中的聚己内酰胺膜与单面光铝箔层的暗面在50—100℃进行热贴合；
S5：将步骤S3中的氟化钠涂层与步骤S4中获得的双酚A型环氧树脂防腐涂层在50—100℃进行热贴合；
S6：热贴合完成后在45—90℃下固化成型。
本发明的有益效果是：提高了隔绝水汽的性能，增强了其耐外层水汽的渗透和内层电解液的腐蚀，有效的提高电池使用寿命和使用安全性。而且其制备方法简单，工艺条件成熟。
附图说明
图1是本发明聚合物锂离子电池软包装膜的结构示意图；
附图的标记含义如下：
1：聚酰胺层；2：铝箔层；3：双酚A型环氧树脂防腐涂层；4：防水汽渗透涂层；5：BOPP阻隔层。
具体实施方式
下面结合附图和具体的实施例对本发明技术方案作进一步的详细描述，以使本领域的技术人员可以更好的理解本发明并能予以实施，但所举实施例不作为对本发明的限定。
如图1所示，聚合物锂离子电池软包装膜，自外侧向内侧依次包括聚酰胺层1和铝箔层2，在所述铝箔层2内侧依次设置有防止铝箔层2受到电解液腐蚀的双酚A型环氧树脂防腐涂层3（图1中黑色实心部分）和阻隔水气的防水汽渗透涂层4（图1中带有竖线部分），在所述防水汽渗透涂层4和聚合物锂离子电池之间还设置有BOPP阻隔层5。优选所述防水汽渗透涂层4是氟化钠涂层，所述聚酰胺层1是聚己内酰胺层。
其中聚酰胺层1是最外层的保护层，厚度是10—20um，优选是15um，其具有优良的耐磨性和耐穿刺性。铝箔层2由一种软质的具有优良延展性的单面光铝箔构成，厚度是40—50um，优选是45um。双酚A型环氧树脂防腐涂层3的厚度是3—5um，固化后形成介于环氧树脂链和橡胶链之间的互穿网状高分子防腐涂层，进而有效地防止涂层的变化，能有效的防护铝箔层2受到电解液腐蚀，双酚A型环氧树脂防腐涂层3还具有极强的附着力、耐候性、耐水性、耐久性等性能。防水汽渗透涂层4可以吸收水气和减弱电解液产生的腐蚀性气体，起到增强水气阻隔的效果。BOPP阻隔层5是一种采用管膜法生产的双向拉伸BOPP，具有较高的热封强度，且有一定的水汽和氧气阻隔性。其厚度是30—40um，优选是40um。
其制备方法包括如下步骤：
S1：将单面光铝箔层2电晕处理后在其亮面涂布一层双酚A型环氧树脂防腐涂层3；
S2：将聚己内酰胺膜进行电晕处理后在其表面涂一层胶黏剂；
S3：在BOPP膜上涂覆一层氟化钠涂层，在氟化钠涂层上涂上胶黏剂；
S4：将步骤S2中的聚己内酰胺膜与单面光铝箔层2的暗面在50—100℃进行热贴合，优选90℃进行热贴合；
S5：将步骤S3中的氟化钠涂层与步骤S4中获得的双酚A型环氧树脂防腐涂层3在50—100℃进行热贴合，优选90℃进行热贴合；
S6：热贴合完成后在45—90℃范围内固化成型，优选在70℃进行固化成型。
本结构的聚合物锂离子电池软包装膜大大提高了隔绝水汽的性能，增强了其耐外层水汽的渗透和内层电解液的腐蚀，有效的提高电池使用寿命。而且其制备方法简单，工艺条件成熟。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或者等效流程变换，或者直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。
Claims (1)
1.聚合物锂离子电池软包装膜的制备方法，其特征在于，包括如下步骤：
S1：将单面光铝箔层电晕处理后在其亮面涂布一层双酚A型环氧树脂防腐涂层；
S2：将聚己内酰胺膜进行电晕处理后在其表面涂一层胶黏剂；
S3：在BOPP膜上涂覆一层氟化钠涂层，在氟化钠涂层上涂上胶黏剂；
S4：将步骤S2中的聚己内酰胺膜与单面光铝箔层的暗面在50—100℃进行热贴合；
S5：将步骤S3中的氟化钠涂层与步骤S4中获得的双酚A型环氧树脂防腐涂层在50—100℃进行热贴合；
S6：热贴合完成后在45—90℃下固化成型。
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| CN104966799B (zh) * | 2015-07-13 | 2018-01-19 | 苏州锂盾储能材料技术有限公司 | 一种锂电池复合包装多功能阻隔铝塑膜 |
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| CN106299182B (zh) * | 2016-08-20 | 2020-03-27 | 浙江超威创元实业有限公司 | 一种具有定位防爆功能的软包锂离子电池及其制造方法 |
| CN106129279B (zh) * | 2016-08-22 | 2018-09-21 | 江苏华谷新材料有限公司 | 聚合物锂离子电池软包装用内层共挤膜及其制备方法 |
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| CN108656649B (zh) * | 2018-03-28 | 2019-11-19 | 江苏东材新材料有限责任公司 | 一种软包锂离子电池用铝塑复合膜及其制备方法 |
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| CN103098257A (zh) * | 2010-09-08 | 2013-05-08 | 凸版印刷株式会社 | 锂离子电池外包装材料 |
| JP5294428B2 (ja) * | 2011-01-21 | 2013-09-18 | 住軽アルミ箔株式会社 | ポリマー電池用包装材料の製造方法 |
| CN102328779A (zh) * | 2011-06-14 | 2012-01-25 | 刘继福 | 阻隔聚合物锂电池内容物的高阻隔层软包装膜 |
| WO2013061932A1 (ja) * | 2011-10-25 | 2013-05-02 | 大日本印刷株式会社 | 電気化学セル用包装材料 |
| CN203674274U (zh) * | 2013-12-31 | 2014-06-25 | 昆山永翔光电科技有限公司 | 聚合物锂离子电池软包装膜 |
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