CN203165991U - 锂离子电池注液孔封口装置 - Google Patents

锂离子电池注液孔封口装置 Download PDF

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CN203165991U
CN203165991U CN2013201071838U CN201320107183U CN203165991U CN 203165991 U CN203165991 U CN 203165991U CN 2013201071838 U CN2013201071838 U CN 2013201071838U CN 201320107183 U CN201320107183 U CN 201320107183U CN 203165991 U CN203165991 U CN 203165991U
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高焕
阳超
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Ningde Amperex Technology Ltd
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Abstract

本实用新型提供了锂离子电池注液孔封口装置，所述锂离子电池注液孔封口装置设置有与电池顶盖的注液孔对应的通孔，所述锂离子电池注液孔封口装置为包括聚丙烯层的膜，所述锂离子电池注液孔封口装置通过聚丙烯层热熔封装在电池顶盖的注液孔及注液孔的周边区域上。优选地，所述锂离子电池注液孔封口装置能够从电池顶盖的注液孔及其所述周边区域上剥离；更优选地，所述锂离子电池注液孔封口装置热熔封装注液孔的周边区域包括注液孔密封焊接区域。由此，避免注液孔及其周边区域被污染和腐蚀，提高注液孔的密封焊接质量。

Description

锂离子电池注液孔封口装置
技术领域
本实用新型涉及锂离子电池生产领域，特别涉及一种锂离子电池注液孔封口装置。 
背景技术
随着现代社会的发展以及人类所面临的能源危机与环境保护问题，人们开始将锂离子电池应用于汽车行业，用锂离子电池为汽车提供驱动力，以实现零排放、零污染。 
随着锂离子电池在汽车行业得到广泛的应用，人们对锂离子电池的安全可靠性提出了更加高的要求，即：汽车在各种路况运行中，锂离子电池不能出现有任何电解液泄露的现象、以及锂离子电池膨胀的现象。 
然而，目前很多汽车用锂离子电池都是采用方形或者圆形硬壳的电池，该类锂离子电池都是以注液孔作为最终的封口，封口工艺主要是采用先进的激光焊接工艺。在生产中，通过注液孔注入电解液的过程中以及化成后通过注液孔排气的过程中都会有一定量的电解液残留在注液孔的周围区域，从而会对该周围区域造成一定的污染和腐蚀。此外，这种电解液的污染和腐蚀将对注液孔的激光密封焊接质量的可靠性造成极大的影响，容易在焊接过程中产生气泡、针孔等坏品，大大影响生产的良品率以及激光密封焊接的可靠性。因此，电解液对注液孔周围区域的污染，成为锂离子电池生产的一大瓶颈。 
实用新型内容
鉴于背景技术中的问题，本实用新型的目的在于提供一种锂离子电池注液孔封口装置，其能使得注液孔及其周边区域与外界隔离，以避免注液孔及其周边区域被污染和腐蚀。 
本实用新型的另一目的在于提供一种锂离子电池注液孔封口装置，其能提高注液孔的密封焊接质量。 
为了实现上述目的，本实用新型提供了锂离子电池注液孔封口装置，所述锂离子电池注液孔封口装置设置有与电池顶盖的注液孔对应的通孔，所述锂离子电池注液孔封口装置为包括聚丙烯层的膜，所述锂离子电池注液孔封口装置通过聚丙烯层热熔封装在电池顶盖的注液孔及注液孔的周边区域上。 
优选地，所述锂离子电池注液孔封口装置能够从电池顶盖的注液孔及其所述周边区域上剥离；更优选地，所述锂离子电池注液孔封口装置热熔封装注液孔的周边区域包括注液孔密封焊接区域。 
本实用新型的有益效果如下： 
本实用新型的锂离子电池注液孔封口装置能使得注液孔及其周边区域与外界隔离，以避免注液孔及其周边区域被污染和腐蚀。 
通过所述锂离子电池注液孔封口装置能够剥离且所述周边区域包括对注液孔进行密封焊接的区域，能提高注液孔的密封焊接区域的洁净度、可焊接性，大大提升了注液孔密封焊接的良品率，提升了电池密封的可靠性质量。 
附图说明
图1是根据本实用新型锂离子电池注液孔封口装置未热熔封装在和电池顶盖的注液孔上的的结构示意图； 
图2是根据本实用新型锂离子电池注液孔封口装置热熔封装在和电池顶盖的注液孔上的结构示意图； 
图3是根据本实用新型锂离子电池注液孔封口装置的铝塑膜的结构示意图。 
其中，附图标记说明如下： 
1电池顶盖 
11注液孔 
2注液孔封口装置 
21通孔 
22尼龙层 
23铝箔层 
24聚丙烯层 
具体实施方式
下面参照附图来说明根据本实用新型的锂离子电池注液孔封口装置。 
如图1至图3所示，根据本实用新型的锂离子电池注液孔封口装置2设置有与电池顶盖1的注液孔11对应的通孔21，锂离子电池注液孔封口装置2为包括聚丙烯层24的膜，锂离子电池注液孔封口装置2通过聚丙烯层24热熔封装在电池顶盖1的注液孔11及注液孔11的周边区域上。通过聚丙烯层24热熔封装在注液孔11及注液孔11的周边区域，能够防止注液孔11及其周边区域被污染或腐蚀（例如但不限于经由注液孔11的电解液注液过程以及锂离子电池化成排气过程中的腐蚀）。 
为了增加锂离子电池注液孔封口装置（即膜）2的强度和韧性、以及热熔封时的导热性，优选地，锂离子电池注液孔封口装置（即膜）2还可包括依次层叠在聚丙烯层24上的铝箔层23以及尼龙层22，外层的尼龙层22、中间的铝箔层23和内层的聚丙烯层24构成的膜为铝塑膜。铝箔层23不仅增加了膜的强度和韧性，而且增加了热熔封聚丙烯层24时的导热性及温度分布的均匀性，从而提高了热熔封的质量和效率。此外，铝塑膜具有良好的强度、韧性、耐候性、耐电解液腐蚀性能，从而能更可靠地用于注液孔11的电解液注液过程以及锂离子电池化成排气过程。此外，在用于后面所述的剥离功能时，通过铝塑膜因其增加的强度，从而容易完整地将锂离子电池注液孔封口装置2剥下。 
优选地，尼龙层22的厚度值为5～15μm。优选地，铝箔层23的厚度值为5～15μm。优选地，聚丙烯层24的厚度值为5～15μm。 
在根据本实用新型所述的锂离子电池注液孔封口装置2中，优选地，锂离子电池注液孔封口装置2能够从电池顶盖1的注液孔11及其所述周边区域上剥离。为了提高注液孔11的密封焊接质量（例如消除气泡、针孔等坏品），更优选地，锂离子电池注液孔封口装置2热熔封装注液孔11的周边区域包括对注液孔进行密封焊接的区域。从而在锂离子电池注液孔封口装置2的保护功能完成之后，将其撕去，以对注液孔11进行密封焊接（例如采用激光密封焊接）。 
下面以结合图1至图3的全部特征的实施例来简单说明一下锂离子电池注液孔封口装置2的操作过程。 
首先准备好铝塑膜制成的锂离子电池注液孔封口装置2以及洁净的无任何污染的电池顶盖1一枚；然后将锂离子电池注液孔封口装置2的通孔21与注液孔11对齐，通过热烫封头压紧，使铝塑膜的内层的聚丙烯层24熔化并且与电池顶盖1的注液孔11的壁以及电池顶盖1的处于注液孔11周边的表面紧密结合，即完成设置过程。 
在完成可能与电解液接触的所有工序后，视实际情况需要，可将锂离子电池注液孔封口装置2撕去，在注液孔11上装好密封钉或者密封球，最后进行激光密封焊接，将电池进行最终的密封。 

Claims (7)

1.一种锂离子电池注液孔封口装置（2），其特征在于，
所述锂离子电池注液孔封口装置（2）设置有与电池顶盖（1）的注液孔（11）对应的通孔（21）；
所述锂离子电池注液孔封口装置（2）为包括聚丙烯层（24）的膜，所述锂离子电池注液孔封口装置（2）经由聚丙烯层（24）热熔封装在电池顶盖（1）的注液孔（11）及注液孔（11）的周边区域上。
2.根据权利要求1所述的锂离子电池注液孔封口装置（2），其特征在于，所述锂离子电池注液孔封口装置（2）还包括依次层叠在聚丙烯层（24）上的铝箔层（23）以及尼龙层（22）。
3.根据权利要求2所述的锂离子电池注液孔封口装置（2），其特征在于，尼龙层（22）的厚度值为5～15μm。
4.根据权利要求2所述的锂离子电池注液孔封口装置（2），其特征在于，铝箔层（23）的厚度值为5～15μm。
5.根据权利要求1所述的锂离子电池注液孔封口装置（2），其特征在于，聚丙烯层（24）的厚度值为5～15μm。
6.根据权利要求1所述的锂离子电池注液孔封口装置（2），其特征在于，所述锂离子电池注液孔封口装置（2）能够从电池顶盖（1）的注液孔（11）及其所述周边区域上剥离。
7.根据权利要求6所述的锂离子电池注液孔封口装置（2），其特征在于，所述锂离子电池注液孔封口装置（2）热熔封装注液孔（11）的周边区域包括对注液孔进行密封焊接的区域。
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CN111403814A (zh) * 2020-03-26 2020-07-10 深圳市量能科技有限公司 一种聚合物锂离子电池的封口方法和装置

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JP2014525658A (ja) * 2011-08-31 2014-09-29 エルジー・ケム・リミテッド 水分浸透に対する長期信頼性が向上した二次電池
JP2015507828A (ja) * 2012-01-09 2015-03-12 ヒソン ケミカル リミテッド 二次電池用アルミニウムパウチフィルム、これを含む包装材、これを含む二次電池および二次電池用アルミニウムパウチフィルムの製造方法

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CN106876620B (zh) * 2015-12-14 2023-08-22 宁德时代新能源科技股份有限公司 二次电池注液孔密封组件
CN111211286A (zh) * 2020-01-07 2020-05-29 苏州清陶新能源科技有限公司 一种锂离子软包电池防漏液方法
CN111403814A (zh) * 2020-03-26 2020-07-10 深圳市量能科技有限公司 一种聚合物锂离子电池的封口方法和装置

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