CN105405990B - 一种大容量软包锂离子电池的铝塑膜 - Google Patents
一种大容量软包锂离子电池的铝塑膜 Download PDFInfo
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Abstract
本发明提供一种大容量软包锂离子电池的铝塑膜,包括铝箔基础层和设于铝箔基础层上、下两表面的热塑性树脂层,所述铝箔基础层与热塑性树脂层之间均设有阻燃层,所述阻燃层是由阻燃剂均匀分散在接着剂中形成;所述阻燃层涂布在铝箔基础层的上、下表面上,所述热塑性树脂层通过所述阻燃层粘结在铝箔基础层上,再经压合成铝塑膜。本发明在铝箔基础层与热塑性树脂层之间均设有阻燃层,提高了铝塑膜的阻燃性能,即提高了铝塑膜安全性和倍率性能。在保证所有安全测试通过的情况下,还兼顾了电池的恒流比和电压平台问题。
Description
技术领域
本发明涉及锂离子电池材料领域,具体涉及一种大容量软包锂离子电池的铝塑膜。
背景技术
由于铝塑膜制作成本低,且构成液态软包装锂离子电池的一个不可缺少的重要组成部分,目前铝塑复合膜作为电池的外壳,取代了一般锂离子电池的钢制或铝制外壳,铝塑复合膜大致可以分为三层:内层为粘结层,多采用聚乙烯或聚丙烯材料,起封口粘结作用;中间层为铝箔,能够防止电池外部水汽的渗入,同时防止内部电解液的渗出;外层为保护层,多采用高熔点的聚酯或尼龙材料,有很强的机械性能,防止外力对电池的损伤,起保护电池的作用。
目前商业化的软包锂离子电池的铝塑膜没有阻燃效果,用在超过200Ah的大容量电池时无法保证安全性。如充电电压高,而且电解质多为有机易燃物,若使用不当,电池会发生危险甚至爆炸。为了提高铝塑膜的阻燃性,目前是通过在电解液中添加一些高沸点、高闪点和不易燃的溶剂来改善电解液的稳定性,该溶剂主要分有机磷化物、有机氟代化合物和卤代烷基磷酸酯。但这些溶剂使电解液的粘度增大、阻抗增大,影响电池的使用性能。另外,也在直接在电解液里面添加阻燃剂,从而导致电池内阻增大,恒流比、电压平台变差,而且还无法保证所有安全测试通过。
发明内容
本发明的目的是提供了一种大容量软包锂离子电池的铝塑膜,不仅解决锂离子电池安全的问题,还提高了电池能量密度。
为实现以上发明目的,本发明提供了以下技术方案:
一种大容量软包锂离子电池的铝塑膜,包括铝箔基础层和设于铝箔基础层上、下两表面的热塑性树脂层,所述铝箔基础层与热塑性树脂层之间均设有阻燃层,所述阻燃层是由阻燃剂均匀分散在接着剂中形成;所述阻燃层涂布在铝箔基础层的上、下表面上,所述热塑性树脂层通过所述阻燃层粘结在铝箔基础层上,经压合而成铝塑膜。
进一步方案,所述阻燃层中接着剂和阻燃剂的质量比为1:(1-3)。
进一步方案,所述热塑性树脂层是由聚丙烯、聚酰胺中至少一种材料制成。
进一步方案,所述接着剂为聚偏氟乙烯、丙烯酸酯、聚苯乙烯丁二烯中至少一种。
进一步方案,所述阻燃剂为磷酸酯、膦腈体中至少一种。
进一步方案,所述两层热塑性树脂层的总厚度为60-65μm、两层阻燃层的总厚度为4-8μm、铝箔基础层的厚度为40μm。
本发明在铝箔基础层与热塑性树脂层之间均设有阻燃层,提高了铝塑膜的阻燃性能,即提高了铝塑膜安全性和倍率性能。在保证所有安全测试通过的情况下,还兼顾了电池的恒流比和电压平台问题。
本发明的阻燃层是由阻燃剂均匀分散在接着剂中形成,使其即有阻燃性能,同时接着剂还有粘结剂的功能,通过将阻燃层涂布在铝箔基础层上、下两表面上,再在另一面粘结热塑性树脂层,然后经压合形成了铝塑膜。
附图说明
图1是本发明的结构示意图;
图2、4是本发明实施例1的铝塑膜制成200Ah锂离子电池的放、充电电压平台;
图3、5是对比例1的铝塑膜制成200Ah锂离子电池的放、充电电压平台。
具体实施方式
如图1所示,铝塑膜包括铝箔基础层1,铝箔基础层1的上表面依次设有第一阻燃层2-1、第一热塑性树脂层3-1,铝箔基础层1的下表面依次设有第二阻燃层2-2、第二热塑性树脂层3-2。
下面各实施例中大容量软包锂离子电池的铝塑膜的制备均是:在铝箔基础层的上、下两表面上均匀涂布阻燃层,再在两阻燃层的另一面均粘结上热塑性树脂层,然后经压合形成五层结构的铝塑膜。
其中阻燃层是由阻燃剂均匀分散在接着剂中形成,接着剂和阻燃剂的质量比为1:(1-3)。
实施例1
一种大容量软包锂离子电池的铝塑膜从上到下依次是由20μm厚的聚丙烯层、2μm厚的阻燃层、40μm厚的铝箔基础层、2μm厚的阻燃层、40μm厚的聚酰胺层经压合而成。
本实施例中阻燃层是由磷酸酯均匀分散在聚偏氟乙烯中形成,其中磷酸酯和聚偏氟乙烯的质量比为1:1。
实施例2
一种大容量软包锂离子电池的铝塑膜从上到下依次是由40μm厚的聚丙烯层、4μm厚的阻燃层、40μm厚的铝箔基础层、4μm厚的阻燃层、20μm厚的聚酰胺层经压合而成。
本实施例中阻燃层是由膦腈体均匀分散在丙烯酸酯和聚偏氟乙烯中形成,其中膦腈体、丙烯酸酯和聚偏氟乙烯三者的质量比为2:0.5:0.5。
实施例3
一种大容量软包锂离子电池的铝塑膜从上到下依次是由35μm厚的由聚丙烯和聚酰胺混合而成的热塑性树脂层、3μm厚的阻燃层、40μm厚的铝箔基础层、3μm厚的阻燃层、30μm厚的聚酰胺层经压合而成。
本实施例中阻燃层是由磷酸酯和膦腈体均匀分散在聚苯乙烯丁二烯中形成,其中磷酸酯、膦腈体和聚苯乙烯丁二烯三者的质量比为1:1:1。
对比例1
一种大容量软包锂离子电池的铝塑膜从上到下依次是由20μm厚的聚丙烯层、40μm厚的铝箔基础层、40μm厚的聚酰胺层经压合而成。
将上实施例1-3和对比例1制备的铝塑膜分别做成200Ah锂离子电池,并在对比例1制成的200Ah锂离子电池的电解液中加入阻燃剂磷酸酯。然后分别按照本行业的标准GB/T18287-2013检测锂离子电池的安全性。具体如下表1所示:
表1、安全性检测结果
针刺是否着火 | 挤压是否着火 | 短路是否着火 | 重物冲击是否着火 | |
实施例1 | 否 | 否 | 否 | 否 |
实施例2 | 否 | 否 | 否 | 否 |
实施例3 | 否 | 否 | 否 | 否 |
对比例1 | 是 | 否 | 否 | 否 |
从表1可看出,本发明制备的铝塑膜制成的200AH锂电池的安全性比对比例1中的200AH锂电池中电解液中直接加阻燃剂的安全性高。
分别以实施例1和对比例1制备的磷酸铁锂200AH电池来比较恒流比和电压平台,试验条件为:0.3C充电3.65v,恒压3.65v,截止电流0.01c,0.3c放电至2.5v。具体如图1-4所示。
比较图2与图3可知,用本发明制备的铝塑膜制成的200AH锂电池的放电平台更长更好。
比较图4、5可知,用本发明制备的铝塑膜制成的200AH锂电池的充电容量高、平台高,且恒流比效率高。
以上实施例并非仅限于本发明的保护范围,所有基于本发明的基本思想而进行修改或变动的都属于本发明的保护范围。
Claims (4)
1.一种大容量软包锂离子电池的铝塑膜,包括铝箔基础层和设于铝箔基础层上、下两表面的热塑性树脂层,其特征在于:所述铝箔基础层与热塑性树脂层之间均设有阻燃层,所述阻燃层是由阻燃剂均匀分散在接着剂中形成;所述阻燃层涂布在铝箔基础层的上、下表面上,所述热塑性树脂层通过所述阻燃层粘结在铝箔基础层上,再经压合成铝塑膜;所述阻燃层中接着剂和阻燃剂的质量比为1:(1-3);所述接着剂为聚偏氟乙烯、丙烯酸酯、聚苯乙烯丁二烯中至少一种。
2.根据权利要求1所述的一种大容量软包锂离子电池的铝塑膜,其特征在于:所述热塑性树脂层是由聚丙烯、聚酰胺中至少一种材料制成。
3.根据权利要求1所述的一种大容量软包锂离子电池的铝塑膜,其特征在于:所述阻燃剂为磷酸酯、膦腈体中至少一种。
4.根据权利要求1所述的一种大容量软包锂离子电池的铝塑膜,其特征在于:所述两层热塑性树脂层的总厚度为60-65μm、两层阻燃层的总厚度为4-8μm、铝箔基础层的厚度为40μm。
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CN108155307B (zh) * | 2017-12-21 | 2020-09-08 | 桑德新能源技术开发有限公司 | 铝塑膜及其用途 |
CN108054438B (zh) * | 2017-12-21 | 2019-12-06 | 桑德新能源技术开发有限公司 | 铝塑膜及其用途与包含其的电池 |
CN109986850B (zh) * | 2017-12-29 | 2021-11-02 | 宁德时代新能源科技股份有限公司 | 锂离子电池及铝塑膜 |
CN110789200A (zh) * | 2018-04-04 | 2020-02-14 | 徐雄剑 | 阻水阻燃的锂电池封装用复合膜及其制备方法 |
US20220149463A1 (en) * | 2019-03-29 | 2022-05-12 | Mitsui Chemicals, Inc. | Outer packaging film for lithium-ion battery, lithium-ion battery, and lithium-ion battery stack |
CN111416067B (zh) * | 2020-03-30 | 2023-05-09 | 湖北亿纬动力有限公司 | 电池用钢箔及其制备方法、包含其的电池壳体、单体电池及电池模组 |
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CN103786385A (zh) * | 2014-02-19 | 2014-05-14 | 东莞新能源科技有限公司 | 锂离子电池及其外包装膜以及外包装膜的制备方法 |
CN104425844A (zh) * | 2013-09-09 | 2015-03-18 | 浙江万向亿能动力电池有限公司 | 一种通过隔离式阻燃液体提高动力电池安全性的方法 |
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CN202678422U (zh) * | 2012-05-23 | 2013-01-16 | 宁德新能源科技有限公司 | 一种安全锂离子电池 |
CN104425844A (zh) * | 2013-09-09 | 2015-03-18 | 浙江万向亿能动力电池有限公司 | 一种通过隔离式阻燃液体提高动力电池安全性的方法 |
CN103786385A (zh) * | 2014-02-19 | 2014-05-14 | 东莞新能源科技有限公司 | 锂离子电池及其外包装膜以及外包装膜的制备方法 |
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