CN1245770C - 一种具有防爆膜的锂电池电芯盖板的制造方法 - Google Patents

一种具有防爆膜的锂电池电芯盖板的制造方法 Download PDF

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CN1245770C
CN1245770C CNB011239581A CN01123958A CN1245770C CN 1245770 C CN1245770 C CN 1245770C CN B011239581 A CNB011239581 A CN B011239581A CN 01123958 A CN01123958 A CN 01123958A CN 1245770 C CN1245770 C CN 1245770C
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CN1400678A (zh
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李鑫
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Shenzhen Bak Power Battery Co Ltd
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Shenzhen Bak Battery Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

公开了一种具有防爆膜的锂电池电芯盖板的制造方法，这种盖板与通常带有刻痕的盖板相比，在盖板上先制造出小孔，在孔上超声波焊接箔材，通过控制箔材的厚度和防爆孔的大小及形状，达到一定压力下爆破的目的；为防止焊接接头漏气，焊前对焊接面预涂密封胶；为防止防爆膜生产过程中破坏，可将压环、箔材、盖板超声波焊成一体。本发明具有以下优点：箔材厚度一致性好，批量生产的盖板易于保证性能的一致性，电芯的使用可靠性较高。

Description

一种具有防爆膜的锂电池电芯盖板的制造方法
发明领域：
本发明与锂电池有关。
背景技术
锂电池是为手机等通讯产品提供能源必不可少的重要配件，而锂电池的核心则是电芯，电芯由壳体、上盖板、下盖板、电极，电解液组成。
目前锂电池电芯一般采用方形结构，壳体一般呈扁平状，上部开口，与上盖板采用激光焊接密封，由于锂电池在制造及使用过程中存在爆炸的危险性，要求壳体或盖板具有防爆功能，通常采用冲压工艺在盖板上冲出一定深度的刻痕，以期达到一定压力下爆破的目的，但实际上由于冲床的精度很难保证，加上冲头的磨损，刻痕的深度很难把握一致性，起不到防爆的目的。
为克服现有技术的局限性，特提出本发明。
发明内容
本发明公开了一种防爆膜的锂电池电芯盖板及其制造方法，这种盖板带有刻痕的盖板相比，防爆盖板是组焊结构，事先在盖板上制造出一定直径的小孔，在孔上超声波焊接一片箔材，这片箔材在电池内部压力增大至一定程度时首先破裂，将压力释放，称这片箔材为防爆膜。防爆盖板的箔材可以选用铜箔、镍箔、不锈钢箔、铝箔，箔材厚度为0.005-0.08mm。
目前生产的电芯壳体分为拉伸成形的壳体和焊接壳体两类。对于前一种结构，电芯的防爆膜在上盖板上制造；对于后一种焊接的壳体来讲，电芯的防爆膜既可以在上盖板上制造，也可以在下盖板上制造。为防止防爆膜在生产流程中破坏，可以在箔材上放一个空心压环，将压环、防爆膜、盖板三者焊接成一体；箔材与盖板、压环清洗干净后，采用超声波焊机将箔材、压环焊接在盖板上的防爆孔的周围。由于箔材、压环、盖板三者之间的焊接面不是理想平面，超声波焊接后焊接接头容易出现漏气问题。在焊接前在焊接面预涂密封胶，然后将三者利用超声波焊机焊接，焊接时焊接面之间少量没有真正焊接上的微观区域依靠密封胶填补，这样组合的结果是防爆膜的焊接接头不会漏气。对于不锈钢盖板，防爆膜采用镍箔或铜箔，对于不同的启爆压力，可调节防爆孔径和箔材厚度；另外为了防止铜箔氧化，可在焊接前后采用镀镍工艺或在焊后在铜箔表面涂密封胶。对于铝合金盖板大片，箔材采用铝箔。
采用本发明的方法制造锂电池电芯防爆膜盖板具有以下优点：由于箔材厚度一致性好，批量生产的盖板易于保证性能的一致性，电芯的使用可靠性较高。
具体实施方式
为制造尺寸如下：长33.70mm，宽7.6mm的不锈钢电芯盖板大片，可以按下面的方法制造，首先在冲压大片时，大片上冲出直径3.3mm的防爆小孔，另外制造直径5.0mm、厚0.01mm的镍箔和外径5.0mm/内径3.6mm的压环，压环厚0.2-0.5mm，压环可采用不锈钢或紫铜；在小孔周围预先涂密封胶，然后将镍箔粘在防爆孔处，放上压环，用功率为1KW，频率20KHz的超声波焊机点焊，焊接时间1-2秒。即得带有防爆膜的电芯盖板大片，防爆膜开启压力为10.0±2.5Kg/cm2。

Claims (4)

1、一种具有防爆膜的锂电池电芯盖板的制造方法，包括如下步骤：
所述电芯盖板由盖板基体和箔材组焊而成，在盖板上事先造出一定直径的小孔，在孔周围用超声波焊接箔材前，预先在焊接面涂密封胶，涂后进行超声波焊接，通过控制箔材的厚度和防爆孔的大小及形状，达到一定压力下爆破的目的。
2、根据权利要求1所述的制造方法，其特征在于超声波焊接防爆膜时，在防爆膜周边一起焊接上一个金属环。
3、根据权利要求1或2所述的制造方法，其特征在于在超声波焊接后在铜箔表面涂覆密封胶。
4、根据权利要求3所述的制造方法，其特征在于在超声波焊接后对盖板整体镀镍。
CNB011239581A 2001-08-08 2001-08-08 一种具有防爆膜的锂电池电芯盖板的制造方法 Expired - Fee Related CN1245770C (zh)

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101398083B (zh) * 2007-09-25 2012-03-14 深圳市比克电池有限公司 对容器、锂离子电池的密封方法
CN102044640A (zh) * 2010-12-09 2011-05-04 唐建平 锂电池防爆盖板
CN102709503B (zh) * 2012-06-18 2015-05-20 深圳市源科昱科技有限公司 动力电池防爆阀及其制作方法
CN107293677A (zh) * 2017-07-04 2017-10-24 合肥力翔电池科技有限责任公司 一种锂电池新型防爆膜
CN107717202B (zh) * 2017-09-30 2020-02-18 Oppo广东移动通信有限公司 壳体组件的加工方法、终端的壳体组件及终端

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