CN111136970B - 一种锂离子电池用铝塑膜及锂离子电池 - Google Patents
一种锂离子电池用铝塑膜及锂离子电池 Download PDFInfo
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Abstract
本发明属于锂离子电池技术领域,尤其涉及一种锂离子电池用铝塑膜,包括依次连接的改性PP层、第一胶粘层、铝层、第二胶粘层、尼龙层和弹性绝缘层,所述弹性绝缘层耐电解液腐蚀,所述弹性绝缘层的厚度为10~50um。另外,本发明还涉及一种锂离子电池,包括所述的锂离子电池用铝塑膜以及封装于其内的电芯。相比于现有技术,本发明既能防止电芯生产过程中电解液腐蚀铝塑膜表层,又能避免铝塑膜封边处出现尖锐弯折而导致铝层发生断裂,有效保证铝塑膜密封效果,还能起到绝缘耐压作用,无需在铝塑膜的表面额外覆盖一层绝缘耐高压胶带。
Description
技术领域
本发明属于锂离子电池技术领域,尤其涉及一种锂离子电池用铝塑膜及锂离子电池。
背景技术
锂离子电池由于其能量密度高、循环寿命长、自放电率小、安全性稳定和无记忆效应等优点,已逐渐取代铅酸电池、镍镉电池、镍锰电池等成为最具商品化价值的储能电池,广泛应用于手机、笔记本电脑、蓝牙设备等便携式电子器件中。其中,软包锂离子电池是以铝塑膜作为卷芯包装材料的一种锂离子电池。铝塑膜主要由PP层、铝层、尼龙层三部分组成,最内部的PP层在电芯封装过程中起到密封作用,中间层铝层的主要作用是防止电池外部水汽渗入和电池内部电解液的渗出,外部的尼龙层则具有很强的机械性能,防止外力对电池的损伤。
然而,由于消费者不断追求能量密度更高的储能电池,锂离子电池的发展方向也趋向于更小、更薄、更轻。这就要求软包锂离子电池的铝塑膜材料更薄,但是越薄的铝塑膜在电池生产过程中越容易破损,从而导致铝塑膜失去阻隔水汽和氧气的作用。软包锂离子电池在生产过程中,尤其是注液后的陈化工序,电池的放置大多采用气袋朝上、侧封边朝下的方式,这种放置方式由于电池侧封边铝塑膜出现尖锐弯折容易造成铝层发生断裂破损(一般称为“角裂”),导致铝塑膜失去阻隔水汽和氧气的功能,并且在电池的使用过程中带来安全隐患。
目前,改善电池角裂的方法主要是通过设计复杂新型的周转盒,比如弹夹等。而这种方法投入的成本较高、难以满足许多小、中型企业的需要。
发明内容
本发明的目的之一在于:针对现有技术的不足,而提供一种锂离子电池用铝塑膜,可有效的避免铝塑膜封边出现尖锐弯折而导致铝层发生断裂,从而有效保证铝塑膜密封效果。
为了实现上述目的,本发明采用以下技术方案:
一种锂离子电池用铝塑膜,包括依次连接的改性PP层、第一胶粘层、铝层、第二胶粘层、尼龙层和弹性绝缘层,所述弹性绝缘层耐电解液腐蚀,所述弹性绝缘层的厚度为10~50um。弹性绝缘层在确保起到对铝塑膜起到保护作用的同时,其厚度也不宜过厚,过厚会增大电池的体积,降低电池的能量密度,影响电池在小型化、轻薄化设备中的使用。
作为本发明所述的锂离子电池用铝塑膜的一种改进,所述弹性绝缘层包括弹性体,所述弹性体为天然橡胶、异戊橡胶、聚丁二烯橡胶、丁苯橡胶、丁基橡胶、二元乙丙橡胶和三元乙丙橡胶、聚丙烯酸酯橡胶和氟橡胶中的至少一种,弹性体包括但不限于此。其一,以上橡胶耐电解液腐蚀,将其用于电池封装时,能防止电芯生产过程中电解液腐蚀铝塑膜表层;其二,以上橡胶均是具有可逆形变的高弹性聚合物材料,避免铝塑膜封边出现尖锐弯折而导致铝层发生断裂,从而有效保证铝塑膜密封效果;其三,以上橡胶具有绝缘耐压作用,当其用于电池封装时能起到绝缘耐压作用,无需在铝塑膜的表面额外覆盖一层绝缘耐高压胶带。
作为本发明所述的锂离子电池用铝塑膜的一种改进,所述弹性体中极性基团的占比为5~40%。通过调整极性基团的占比,一方面,使弹性绝缘层满足动力电池表面绝缘耐高压的作用,满足>2KV电压不击穿的耐压要求;另一方面,使弹性绝缘层满足不被电解液溶剂溶胀的要求,电解液在加工过程中粘附在弹性绝缘层表面,在溶剂挥发后,电解液污渍可以从弹性绝缘层表面用水或者酒精擦拭掉。
作为本发明所述的锂离子电池用铝塑膜的一种改进,所述弹性体中极性基团的占比为10~30%。当极性基团的占比在该范围内时,其绝缘耐高压作用更好,更不易被电解液溶剂溶胀。
作为本发明所述的锂离子电池用铝塑膜的一种改进,所述弹性绝缘层还包括酸碱指示剂,所述酸碱指示剂与所述弹性体相容性好。在电芯生产过程中,酸碱指示剂的添加便于封装不良品的识别。
作为本发明所述的锂离子电池用铝塑膜的一种改进,所述酸碱指示剂为甲基红、溴甲酚绿、百里酚蓝和甲基橙中的任意一种。酸碱指示剂包括但不限于此,以上几种酸碱指示剂与上述列举的弹性体乳液均有良好的相容性。
作为本发明所述的锂离子电池用铝塑膜的一种改进,所述弹性绝缘层呈乳液状态涂覆于所述尼龙层表面,包括但不限于刷涂、辊涂、喷涂。
作为本发明所述的锂离子电池用铝塑膜的一种改进,呈乳液状态的所述弹性绝缘层的制备方法具体如下:
S1,往弹性体中加入非离子型表面活性剂,得到混合均匀的初级乳液;
S2,将酸碱指示剂溶解于乙醇中,然后加入到初级乳液中,得到分散均匀的弹性绝缘层乳液。
作为本发明所述的锂离子电池用铝塑膜的一种改进,所述非离子型表面活性剂为聚氧乙烯型表面活性剂和多元醇型表面活性剂。
本发明的另一个目的在于:提供一种锂离子电池,包括铝塑膜以及封装于所述铝塑膜内的电芯,所述铝塑膜为说明书前文任一段所述的锂离子电池用铝塑膜。
相比于现有技术,本发明至少具有以下有益效果:本发明的锂离子电池采用具有耐电解液腐蚀的弹性绝缘层的铝塑膜,其一,由于铝塑膜耐电解液腐蚀,将其用于电池封装时,能防止电芯生产过程中电解液腐蚀铝塑膜表层;其二,由于铝塑膜具有高弹性,能避免铝塑膜封边处出现尖锐弯折而导致铝层发生断裂,从而有效保证铝塑膜密封效果;其三,由于铝塑膜具有绝缘耐压作用,当其用于电池封装时能起到绝缘耐压作用,无需在铝塑膜的表面额外覆盖一层绝缘耐高压胶带。
附图说明
图1是本发明中实施例1~2中锂离子电池用铝塑膜的结构示意图。
图2是本发明中对比例1中铝塑膜的结构示意图。
其中:1-改性PP层,2-第一胶粘层,3-铝层,4-第二胶粘层,5-尼龙层,6-弹性绝缘层。
具体实施方式
下面结合具体实施方式和说明书附图,对本发明作进一步详细的描述,但本发明的实施方式并不限于此。
实施例1
如图1所示,一种锂离子电池用铝塑膜,包括依次连接的改性PP层1、第一胶粘层2、铝层3、第二胶粘层4、尼龙层5和弹性绝缘层6,弹性绝缘层6耐电解液腐蚀,弹性绝缘层6的厚度为10~50um。
优选的,弹性绝缘层6包括弹性体,弹性体为天然橡胶、异戊橡胶、聚丁二烯橡胶、丁苯橡胶、丁基橡胶、二元乙丙橡胶和三元乙丙橡胶、聚丙烯酸酯橡胶和氟橡胶中的至少一种。
优选的,弹性体中极性基团的占比为5~40%。更为优选的,弹性体中极性基团的占比为10~30%。
优选的,弹性绝缘层6呈乳液状态涂覆于尼龙层5表面。
实施例2
与实施例1不同的是:本实施例的弹性绝缘层6还包括酸碱指示剂,酸碱指示剂与弹性体相容性好。酸碱指示剂为甲基红、溴甲酚绿、百里酚蓝和甲基橙中的任意一种。
优选的,呈乳液状态的弹性绝缘层6的制备方法具体如下:
S1,往弹性体中加入非离子型表面活性剂,得到混合均匀的初级乳液;
S2,将酸碱指示剂溶解于乙醇中,然后加入到初级乳液中,得到分散均匀的弹性绝缘层乳液。
优选的,非离子型表面活性剂为聚氧乙烯型表面活性剂和多元醇型表面活性剂。
其余同实施例1,这里不再赘述。
实施例3
一种锂离子电池,包括实施例1的铝塑膜以及封装于铝塑膜内的电芯。
实施例4
一种锂离子电池,包括实施例2的铝塑膜以及封装于铝塑膜内的电芯。
对比例1
一种锂离子电池,包括铝塑膜以及封装于铝塑膜内的电芯,铝塑膜包括依次连接的改性PP层1、第一胶粘层2、铝层3、第二胶粘层4和尼龙层5,具体如图2所示。
性能测试
分别制得3个实施例3的电池(编号为1~3)、3个实施例4的电池(编号为4~6)和3个对比例1的电池(编号为7~9),对电池依次进行耐压测试,并对电池的封边进行模拟挤压(摊平再挤压,重复200次),观察其是否发生角裂,最后针刺铝塑膜,观察其能否检测出不良品,测试结果见表1。
表1测试结果
电池编号 | 耐压测试 | 是否角裂 | 能否直接检出不良品 |
1 | >2KV电压不击穿 | 否 | 否 |
2 | >2KV电压不击穿 | 否 | 否 |
3 | >2KV电压不击穿 | 否 | 否 |
4 | >2KV电压不击穿 | 否 | 能 |
5 | >2KV电压不击穿 | 否 | 能 |
6 | >2KV电压不击穿 | 否 | 能 |
7 | 2KV电压被击穿 | 是 | 否 |
8 | 2KV电压被击穿 | 是 | 否 |
9 | 2KV电压被击穿 | 是 | 否 |
由表1可以看出,相比于现有的铝塑膜,本发明的铝塑膜能承受更高电压的击穿测试,而且挤压后不发生角裂,同时弹性绝缘层中添加有酸碱指示剂的还能直接检出封装不良品。这是因为,本发明在传统的铝塑膜的基础上增加了一层弹性绝缘层,弹性绝缘层中添加有弹性体,其不仅对铝塑膜中的铝层起到很好的保护,而且当其用于电池封装时能起到绝缘耐压作用,因此,铝塑膜封边在受到外力挤压的过程中,可有效的避免出现尖锐弯折而导致铝层发生断裂。除此之外,弹性绝缘层中还添加有酸碱指示剂,在电池封装不良导致漏液时,其能显色起到检出不良品的作用。
根据上述说明书的揭示和教导,本发明所属领域的技术人员还能够对上述实施方式进行变更和修改。因此,本发明并不局限于上述的具体实施方式,凡是本领域技术人员在本发明的基础上所作出的任何显而易见的改进、替换或变型均属于本发明的保护范围。此外,尽管本说明书中使用了一些特定的术语,但这些术语只是为了方便说明,并不对本发明构成任何限制。
Claims (7)
1.一种锂离子电池用铝塑膜,其特征在于,包括依次连接的改性PP层、第一胶粘层、铝层、第二胶粘层、尼龙层和弹性绝缘层,所述弹性绝缘层耐电解液腐蚀,所述弹性绝缘层的厚度为10~50um,所述弹性绝缘层包括弹性体,所述弹性体为天然橡胶、异戊橡胶、聚丁二烯橡胶、丁苯橡胶、丁基橡胶、二元乙丙橡胶和三元乙丙橡胶、聚丙烯酸酯橡胶和氟橡胶中的至少一种,所述弹性体中极性基团的占比为5~40%,所述弹性绝缘层还包括酸碱指示剂,所述酸碱指示剂与所述弹性体相容性好。
2.根据权利要求1所述的锂离子电池用铝塑膜,其特征在于,所述弹性体中极性基团的占比为10~30%。
3.根据权利要求1所述的锂离子电池用铝塑膜,其特征在于,所述酸碱指示剂为甲基红、溴甲酚绿、百里酚蓝和甲基橙中的任意一种。
4.根据权利要求1所述的锂离子电池用铝塑膜,其特征在于,所述弹性绝缘层呈乳液状态涂覆于所述尼龙层表面。
5.根据权利要求4所述的锂离子电池用铝塑膜,其特征在于,呈乳液状态的所述弹性绝缘层的制备方法具体如下:
S1,往弹性体中加入非离子型表面活性剂,得到混合均匀的初级乳液;
S2,将酸碱指示剂溶解于乙醇中,然后加入到初级乳液中,得到分散均匀的弹性绝缘层乳液。
6.根据权利要求5所述的锂离子电池用铝塑膜,其特征在于:所述非离子型表面活性剂为聚氧乙烯型表面活性剂和多元醇型表面活性剂。
7.一种锂离子电池,其特征在于:包括铝塑膜以及封装于所述铝塑膜内的电芯,所述铝塑膜为权利要求1~6任一项所述的锂离子电池用铝塑膜。
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