CN115228706A - 一种溶胀薄膜的涂胶工艺 - Google Patents
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Abstract
本发明公开一种溶胀薄膜的涂胶工艺,包括:S1、涂基膜:将设定配比的亚克力胶水涂布在基膜上,基膜选用耐酸性、耐溶剂的基材;S2、烘干:将涂布有胶水的基膜经100℃~120℃的加热烘干;S3、复合:通过加热辊筒的压合作用将涂布有亚克力胶的基膜复合在溶胀薄膜上;S4、收卷:将复合后的溶胀胶带进行卷绕;S5、熟化:将带有溶胀胶的溶胀薄膜在常温环境中熟化3‑4天;S6、涂布离型剂:在溶胀薄膜的另一面涂覆非硅离型剂或者采用水性氟塑离型剂;S7、剥离:将PET基膜从溶胀薄膜上分离出来;S8、卷绕:将复合后的溶胀胶带进行卷绕,形成整卷的母卷;S9、分切:将溶胀薄膜按照设定尺寸进行分切,即成成品。
Description
技术领域
本发明公开一种锂电池加工工艺,特别是一种溶胀薄膜的涂胶工艺。
背景技术
锂电池是一类由锂金属或锂合金为正/负极材料、使用非水电解质溶液的电池。锂电池大致可分为两类:锂金属电池和锂离子电池。锂离子电池不含有金属态的锂,并且是可以充电的。
现有技术中的锂电池通常分为软包电池、柱状电池和纽扣式电池等几种。柱状电池和纽扣式电池的结构都是采用金属外壳包裹电芯制成,在加工过程中,先加工好外壳,然后再将电芯材料卷绕形成电池卷芯(即电芯),最后将电池卷芯装入壳体内,封装形成锂电池。由于加工工艺的限制,电芯尺寸不可能做到与外壳尺寸完全吻合,这样就难免会产生电芯与外壳之间存在一定的间隙,电池封装好后就会造成电芯在外壳内产生晃动,在运输、使用、碰撞试验、跌落试验等过程中,难免造成损坏,严重的情况下,会造成电芯极耳位脱焊、虚连以及电池短路等,从而造成电池故障,因此,如何解决电池电芯与外壳之间的间隙问题,就成了锂电池行业亟待解决的问题。由于此类薄膜不耐酸性溶剂,因此,如何将胶水涂布在薄膜上,为困扰着行业的一大难题。
发明内容
针对上述提到的现有技术中的锂电池生产过程中,填充电芯和外壳之间间隙的薄膜不耐化学溶剂的缺点,本发明提供一种溶胀薄膜的涂胶工艺,通过转移涂布的方式,解决无法直接将胶水涂覆的问题。
本发明解决其技术问题采用的技术方案是:一种溶胀薄膜的涂胶工艺,该工艺包括下述步骤:
步骤S1、涂基膜:将设定配比的亚克力胶水涂布在带涂硅油的离型基膜上,基膜选用耐酸性、耐溶剂的基材;
步骤S2、烘干:将涂布有胶水的基膜经100℃~120℃的加热烘干;
步骤S3、复合:通过加热辊筒的压合作用将涂布有亚克力胶的基膜复合在溶胀薄膜上;
步骤S4、收卷:将复合后的溶胀胶带进行卷绕;
步骤S5、熟化:将带有溶胀胶的溶胀薄膜在常温环境中熟化3-4天;
步骤S6、涂布离型剂:在溶胀薄膜的另一面涂覆非硅离型剂或者采用水性氟塑离型剂;
步骤S7、剥离:将PET基膜从溶胀薄膜上分离出来;
步骤S8、卷绕:将胶带进行卷绕,形成整卷带有溶胀胶的溶胀薄膜;
步骤S9、分切:将溶胀薄膜按照设定尺寸进行分切,即成成品。
本发明解决其技术问题采用的技术方案进一步还包括:
所述的步骤S1中,基膜选用PET基膜,基膜上做涂硅油处理,硅油厚度为0.08mm~0.12mm。
所述的步骤S1中,亚克力胶水的重量配比:丙烯酸胶水80~120重量份、乙酸乙酯170~200重量份和异氰酸酯0.8~1.2重量份,混合搅拌10分钟,使其混合均匀,即形成亚克力胶水。
所述的步骤S1中,亚克力胶水的涂覆厚度为0.003mm~0.005mm。
所述的步骤S2中,采用隧道式加热烘箱,涂布有胶水的基膜在烘箱内经过时间不少于60秒。
所述的步骤S3中,复合时的温度保持在55℃~65℃。
所述的步骤S3中,复合时一侧采用金属辊筒,另一侧采用橡胶辊筒,金属辊筒与橡胶辊筒之间的压力为0.4Mpa~0.5Mpa之间。
所述的步骤S6中,非硅离型剂采用重量比为0.8~1.2:900~1200的非硅离型剂原液和溶剂制成,在80℃~90℃的温度下搅拌10分钟~20分钟。
所述的步骤S6中,采用带刮刀装置的镜面辊进行表面涂覆,涂覆厚度为0.0001mm~0.0002mm,涂覆后经45℃~55℃烘干5秒~10秒。
所述的步骤S8中,卷绕采用梯度收卷方式进行收卷,初始收卷力采用20N~30N,每隔10米收卷力降低0.25N~0.3N。
本发明的有益效果是:采用本发明的工艺可解决溶胀薄膜不耐酸性溶剂,无法直接将胶水涂布在溶胀薄膜上的问题,通过本工艺的生产的溶胀薄膜可贴覆在电池卷芯与外壳之间。最终生产的溶胀薄膜可用于动力锂电池、电动工具锂电池等中,将该薄膜包覆电池卷芯后装入外壳中,注入电解液后,薄膜体积溶胀体积膨胀比可达到或大于300%,从而充分填充电池内部的间隙,起到固定、绝缘、减震的作用,减少或杜绝电池在运动过程中,由于振动引起的单体电池短路、极耳脱焊等现象,大大提高电池的安全性。
下面将结合附图和具体实施方式对本发明做进一步说明。
附图说明
图1为本发明工艺流程图。
具体实施方式
本实施例为本发明优选实施方式,其他凡其原理和基本结构与本实施例相同或近似的,均在本发明保护范围之内。
请参看附图1,本发明主要保护一种溶胀薄膜的涂胶工艺,该工艺主要包括下述步骤:
步骤S1、涂基膜:将设定配比的亚克力胶水(丙烯酸胶水)涂布在基膜上,基膜选用耐酸性、耐溶剂的基材,本实施例中,选用的为PET基膜,基膜上做涂硅油处理,本实施例中,硅油厚度为0.08mm~0.12mm,使其达到25~35g的剥离力,涂布胶水时在涂布机上进行涂布,通过挤压喷涂的方式将亚克力胶水均匀的涂布在PET基膜的硅油面上,本实施例中,亚克力胶水的重量配比:丙烯酸胶水80~120重量份、乙酸乙酯170~200重量份和异氰酸酯(即固化剂)0.8~1.2重量份,混合搅拌10分钟,使其混合均匀,即形成亚克力胶水,通过狭缝喷涂涂头进行涂覆,或者通过线棒涂覆工艺涂覆在基膜上,涂覆厚度为0.003mm~0.005mm;
步骤S2、烘干:将涂布有胶水的基膜经100℃~120℃的加热烘干,使亚克力胶水和固化剂产生交联,同时使胶水中的乙酸乙酯挥发,本实施例中,加热烘干时间为60秒以上,以使亚克力胶水分子键打开,产生交联,优选采用隧道式加热烘箱,即涂布有胶水的基膜在烘箱内经过时间不少于60秒,烘箱产生的尾气通过环保活性炭吸附处理后,进行排放,防止对空气造成污染;
步骤S3、复合:通过加热辊筒的压合作用将涂布有亚克力胶的基膜复合在溶胀薄膜上,本实施例中,复合时的温度保持在55℃~65℃,即加热辊筒的加热温度为55℃~65℃,复合时一侧采用金属辊筒(优选为采用45#高碳钢,表面经过镀铬处理),另一侧采用橡胶辊筒,金属辊筒内设置有热水或其他热媒介质,具体实施时,也可以采用其他加热方式,金属辊筒和橡胶辊筒紧贴设置,钢辊筒与橡胶辊筒之间的压力为0.4Mpa~0.5Mpa之间;
步骤S4、收卷:将复合后的溶胀胶带进行卷绕,形成整卷的母卷;
步骤S5、熟化:将溶胀胶母卷在常温环境中熟化3-4天,即静置3-4天,使亚克力胶水完全附着在溶胀薄膜上;
步骤S6、涂布离型剂:在溶胀薄膜的另一面(溶胀薄膜一面贴覆有亚克力胶水,离型剂涂覆在没有胶水的一面)涂覆非硅离型剂或者采用水性氟塑离型剂,使其解卷力降低,以避免相邻层的溶胀薄膜通过亚克力胶水相互粘连,本实施例中,选用的非硅离型剂采用重量比为0.8~1.2:900~1200的非硅离型剂原液和溶剂制成,溶剂可选用120#溶剂油,在80℃~90℃的温度下搅拌10分钟~20分钟,使非硅离型剂完全熔化即可,采用带刮刀装置的镜面辊进行表面涂覆,涂覆厚度为0.0001mm~0.0002mm,涂覆后经45℃~55℃烘干5秒~10秒即可,如果采用水性氟塑离型剂,则采用市售的水性氟塑离型剂原液进行涂覆即可;
步骤S7、剥离:将PET基膜从溶胀薄膜上分离出来,即将PET基膜进行剥离;
步骤S8、卷绕:将胶带进行卷绕,形成整卷的母卷;本实施例中,卷绕采用梯度收卷方式进行收卷,初始收卷力采用20N~30N,每隔10米收卷力降低0.25N~0.3N,以使胶带收卷后为平整状态,防止中间产生褶皱;
步骤S9、分切:将溶胀薄膜按照设定尺寸进行分切,即成成品。
采用本发明的工艺可解决溶胀薄膜不耐酸性溶剂,无法直接将胶水涂布在溶胀薄膜上的问题,通过本工艺的生产的溶胀薄膜可贴覆在电池卷芯与外壳之间。最终生产的溶胀薄膜可用于动力锂电池、电动工具锂电池等中,将该薄膜包覆电池卷芯后装入外壳中,注入电解液后,薄膜体积溶胀体积膨胀比可达到或大于300%,从而充分填充电池内部的间隙,起到固定、绝缘、减震的作用,减少或杜绝电池在运动过程中,由于振动引起的单体电池短路、极耳脱焊等现象,大大提高电池的安全性。
Claims (10)
1.一种溶胀薄膜的涂胶工艺,其特征是:所述的工艺包括下述步骤:
步骤S1、涂基膜:将设定配比的亚克力胶水涂布在带涂硅油的离型基膜上,基膜选用耐酸性、耐溶剂的基材;
步骤S2、烘干:将涂布有胶水的基膜经100℃~120℃的加热烘干;
步骤S3、复合:通过加热辊筒的压合作用将涂布有亚克力胶的基膜复合在溶胀薄膜上;
步骤S4、收卷:将复合后的溶胀胶带进行卷绕;
步骤S5、熟化:将带有溶胀胶的溶胀薄膜母卷在常温环境中熟化3-4天;
步骤S6、涂布离型剂:在溶胀薄膜的另一面涂覆非硅离型剂或者采用水性氟塑离型剂;
步骤S7、剥离:将PET基膜从溶胀薄膜上分离出来;
步骤S8、卷绕:将复合后的溶胀胶带进行卷绕,形成整卷的母卷;
步骤S9、分切:将溶胀薄膜母卷按照设定尺寸进行分切,即成成品。
2.根据权利要求1所述的溶胀薄膜的涂胶工艺,其特征是:所述的步骤S1中,基膜选用PET基膜,基膜上做涂硅油处理,硅油厚度为0.008mm~0.012mm。
3.根据权利要求1所述的溶胀薄膜的涂胶工艺,其特征是:所述的步骤S1中,亚克力胶水的重量配比:丙烯酸胶水80~120重量份、乙酸乙酯170~200重量份和异氰酸酯0.8~1.2重量份,混合搅拌10分钟,使其混合均匀,即形成亚克力胶水。
4.根据权利要求1所述的溶胀薄膜的涂胶工艺,其特征是:所述的步骤S1中,亚克力胶水的涂覆厚度为0.005mm~0.01mm。
5.根据权利要求1所述的溶胀薄膜的涂胶工艺,其特征是:所述的步骤S2中,采用隧道式加热烘箱,涂布有胶水的基膜在烘箱内经过时间不少于60秒。
6.根据权利要求1所述的溶胀薄膜的涂胶工艺,其特征是:所述的步骤S3中,复合时的温度保持在55℃~65℃。
7.根据权利要求1所述的溶胀薄膜的涂胶工艺,其特征是:所述的步骤S3中,复合时一侧采用金属辊筒,另一侧采用橡胶辊筒,金属辊筒与橡胶辊筒之间的压力为0.4Mpa~0.5Mpa之间。
8.根据权利要求1所述的溶胀薄膜的涂胶工艺,其特征是:所述的步骤S6中,非硅离型剂采用重量比为0.8~1.2:900~1200的非硅离型剂原液和溶剂制成,在80℃~90℃的温度下搅拌10分钟~20分钟。
9.根据权利要求1所述的溶胀薄膜的涂胶工艺,其特征是:所述的步骤S6中,采用带刮刀装置的镜面辊进行表面涂覆,涂覆厚度为0.0001mm~0.0002mm,涂覆后经45℃~55℃烘干5秒~10秒。
10.根据权利要求1所述的溶胀薄膜的涂胶工艺,其特征是:所述的步骤S8中,卷绕采用梯度收卷方式进行收卷,初始收卷力采用20N~30N,每隔10米收卷力降低0.25N~0.3N。
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