CN102848646A - 电池袋板边缘绝缘 - Google Patents
电池袋板边缘绝缘 Download PDFInfo
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Abstract
本发明涉及电池袋板边缘绝缘。公开了一种适于形成电池袋的多层层叠板。层叠板包括核心金属层、密封层和绝缘层。密封层被粘合到核心金属层的一个表面,以及绝缘层被粘合到核心金属层的另一个表面。绝缘层的宽度大于核心金属层的宽度,使得绝缘层延伸超过核心金属层的两个边缘。当通过折叠层叠板形成袋时,绝缘层保护层叠板的核心金属层的边缘不在袋的边缘或侧边暴露。还公开和要求了其他实施例。
Description
技术领域
本发明的实施例涉及一种袋型锂聚合物电池。还公开了其他实施例。
背景技术
近来,紧凑和轻巧便携的电子设备,例如智能电话、笔记本电脑和平板电脑、以及媒体播放器,已经获得了有效的开发和生产。电池通常被用作这些便携式设备的内部电源,以使得设备在外部电源不可时仍可以工作。电池可以采用多种电化学技术中的任意一种,并且可以各种形状因数制造。对于便携式设备,对袋型锂离子聚合物电池(也被称为锂聚合物电池)的兴趣在不断增加,原因在于低制造成本、轻重量以及容易修改形状。
袋型锂聚合物电池通过在袋型壳体中安装电极组件来构成,所述袋型壳体由多层层叠板制成。在通常的袋型电池中,多层层叠板具有为金属箔的核心层。该金属箔基本上是防潮和抗氧化的,以防止由于潮气或氧与壳体内的电解液交互而发生不希望的反应。当壳体被密封后,金属箔被暴露在壳体边缘的周围,因此需要被绝缘以防止袋材料的腐蚀,如果由于非故意地和便携式设备中其他金属部分接触而引起了金属箔接地或电偏置,则可能发生袋材料的腐蚀。典型的,为了绝缘金层箔,壳体的密封边缘通常对着壳体的侧边被手工折叠,以及然后将胶带放在密封边缘上以绝缘金属箔并且对着壳体的侧边固定边缘。绝缘金属箔的手工工艺耗时并且因此是昂贵的。此外,用这种方式折叠密封边缘并在其上施加胶带,增加了电池的整个尺寸。这可能会限制可以被装入到壳体内的电极组件的尺寸;另外,其可能会减少在其中安装该电池的便携式电子设备内的有价值的空间。
发明内容
公开了一种电池袋板,本质上绝缘该板的核心金属层的边缘。多层层叠板包括:核心层、密封层和绝缘层。核心层具有两个表面。核心层的一个表面附于密封层,以及另一个表面附于绝缘层。绝缘层比核心层宽。
在一个实施例中,当板被折叠且被热密封以形成封闭电池电极组件的袋后,密封层形成袋的内部衬里,以及绝缘层形成袋的外部衬里。由于绝缘层比核心层宽,例如,类似于一个悬突,绝缘层的外围部分保护核心层的边缘免于暴露到袋的边缘或侧边的周围。这固有地绝缘了核心层,而不需要折叠和用胶带将绝缘层的外围部分粘到袋的侧边。
以上的简要说明没有包括本发明所有方面的全部罗列。可以想到,本发明包括所有可以从以上简要说明的各个方面的所有适当组合实践的系统和方法,以及还包括那些在以下详细描述部分中公开的和尤其在随本申请一起提交的权利要求中所指出的方法和系统。这样的组合具有未在以上简要说明中提及的显著的优点。
附图说明
本发明的实施例将通过参考以下简要说明的附图来描述。本发明的实施例仅作为示例的方式示出,而并不是限于附图中的图,在附图中,相同的附图标记表示类似的部件。应当注意在本公开中的本发明实施例中提到的“一个”或“一”并非指必须相同的实施例,并且其意味着至少一个。
图1是多层层叠板的透视图。
图2是多层层叠板的正视图。
图3是一个开口袋的透视图。
图4是一个封闭、但还没有密封的袋的正视图。
图5是描述在袋内放置电极组件的透视图。
图6是根据本发明的另一个实施例,由可选的多层层叠板叠加的袋的顶视图。
图7是制造电池组由执行的操作的流程图。
具体实施方式
现在,通过参考附图对本发明的几个实施例进行解释。不管实施例中描述的部件的形状、相对位置和其他方面是否被清楚定义,本发明的范围并不仅限于所示出的、仅仅意味着示意目的的部件。同时,尽管提出了很多的细节,但是应当理解本发明的一些实施例可以不需要这些细节而被实践。在其他示例中,公知的电路、结构和技术设有被详细示出以便不妨碍对说明的理解。
图1和图2示出了可被用来形成电池的袋型壳体的多层层叠板10,所述电池例如是锂离子聚合物电池(也被称为锂聚合物电池)。多层材料10可以具有内部密封层11、核心层12和外部绝缘层13。核心层12具有宽度W1。内部密封层11可以具有与核心层12一样的宽度W1。宽度W1是根据电池的特定设计来选择的。外部绝缘层13具有大于核心层12的宽度W1的宽度W2,使得外部层13相对的左边缘和右边缘如图所示那样分别延伸超过核心层12相对的左边缘和右边缘足够远,以给核心层12的边缘提供充足的绝缘。例如,外部层13的边缘可以延伸超过核心层12的相应边缘大约0.1至0.5毫米,使得外部层13的宽度W2大于核心层12的宽度W1大约0.2至1毫米。
内部密封层11可以是聚烯烃基聚合物。内部密封层11直接接触电极组件。利用聚合物热融合和绝缘特性的优点,其用作电极组件的电屏蔽。聚烯烃基聚合物的示例包括但不限于:聚丙烯、聚氯乙烯、聚乙烯、乙烯-丙烯共聚物、聚乙烯-丙烯酸聚合物、和聚丙烯-丙烯酸共聚物。特别的,流延聚丙烯膜(CPP,casting polypropylene film)可以用作内部密封层。内部密封层11可具有范围在30至150微米的厚度。
核心层12被插入在内部密封层11和外部绝缘层13之间。其可以由金属箔制成并且用作防止湿气和空气透过袋且保持层叠板10的强度的衬底。可以用来形成金属箔的材料的示例包括铝、镍或钢。核心层12可以具有范围在20至150微米的厚度。
外部绝缘层13提供绝缘以保护层叠板的其他层,尤其是核心层12。可以用作外部层13的聚合物的示例包括尼龙,尤其是定向尼龙膜。外部层13可以具有范围在15至25微米的厚度。
为了形成多层板10,核心层12被制备成具有适合于要被袋所封闭的电极组件的元件设计的宽度。内部层11可以被制备成具有与核心层12相同的宽度。外部层13被制备成具有比核心层12的宽度宽的宽度。内部层11对着核心层12的一个表面放置。外部层13对着核心层12的另一个表面放置,使得外部层13的边缘延伸超过核心层12的边缘。可以例如使用干式层合(drylamination)、热层合(heat lamination)或挤出层合(extrusion lamination)把这些层粘合在一起。例如,可以把粘结剂插入到一层和另一层之间,以及然后进行干燥。粘结剂可以是例如聚氨酯树脂的粘结剂,其具有粘性和抗张强度,以防止随着时间的层间分离并防止袋被外部挤压受到损坏。这些层然后使用热压辊在预定压力下以高于室温的温度被粘合在一起。可选的,这些层可以使用压力辊在预定压力下以室温被粘合在一起。
图3和4示出了可以由多层层叠板10构造的袋型壳体20。为了产生袋20,可在层叠板10中形成空腔21,以及折叠层叠板10以产生覆盖空腔21的顶部分22。在一个实施例中,板的第一和第二部分关于基本上垂直于板10的相对边缘的折叠线而被折叠,如图3所示。空腔21和顶部分22被制造成使得内部密封层11形成袋20的内部表面,以及外部绝缘层13形成袋20的外部表面。空腔20具有预定的宽度和深度以容纳电极组件30,如图5所示。
在空腔21中放置电极组件30之后,围绕空腔21的板10的顶部分21和边缘部分23可以被粘合到一起以密封袋,如图4所示。袋20可以如图所示沿着袋20的三个侧边被热密封。袋20的第四侧边通常由折叠袋20以产生顶部分22来形成,并且因此不需要热密封。为了封闭电极组件30并且密封袋20,内部密封层11在顶部分22处的外围部分和内部密封层11在凸缘或边缘部分23处的部分可以被粘合在一起,以得到一个完全密封的袋20。
在另一个实施例中,袋可以由两个单独的多层层叠板10产生。空腔可以在两个板之一中形成。另一个板可以用作袋的覆盖空腔的顶部分。在电极组件放置到空腔之后,顶部分和空腔周围的板的边缘部分可被粘合在一起以密封袋。在这种情况下,可以沿着袋的四个侧边对袋进行热密封。为了封闭电极组件和密封袋,顶部分上的内部密封层的外围部分和边缘部分上的内部密封层可被粘合在一起,以得到一个完全密封的袋。
在另一个实施例中,可以在袋的顶部分和底部分中同时形成空腔。在一个实施例中,多层层叠板可关于基本上垂直于板的相对边缘的折叠线而被折叠,以形成顶部分和底部分。在另一个实施例中,两个单独的板可用作顶部分和底部分。例如,每一部分的空腔可以具有电极组件高度的一半的深度。在底部分的空腔中放入电极组件后,顶部分的空腔可以被放置在电极组件之上。围绕顶部空腔的顶部分的边缘部分和围绕底部空腔的底部分的边缘部分可被粘合在一起以密封袋。为了封闭电极组件和密封袋,内部密封层在顶部分的边缘部分上的部分和内部密封层在底部分的边缘部分上的部分可被粘合在一起,以得到一个完全密封的袋。
[00251应当注意,虽然此处附图示出了板10在袋20的两个相对的侧边24_L、24_R具有绝缘层13的“外悬”的外围部分(见图3的示例),但足板10也可以被制备成在其端部25具有进一步的外悬部分。后者为袋20的切割端部,其与折叠线穿过的端部相对(见图3)。
图3示出了袋20具有基本上直的侧边24_L、24_R,和基本上直的端部25。然而,当在每一层都具有基本上直的边缘的多层层叠板10中形成空腔21时,袋20的侧边24_L、24_R和端部25可能不是直的。相反,边缘部分23可能在空腔21周围具有可变宽度,其中该宽度取决于空腔的形状和尺寸。边缘部分23的可变宽度可能会导致侧边24_L、24_R和端部25具有波浪形,以及因此袋20的底部分的边缘不能和顶部分56的边缘对准。多层层叠板可以被设计和制造成具有抵消这种效应的形状。板可以具有一形状,使得当在板中形成空腔时,侧边24_L、24_R和端部25将基本上是直的,并能与顶部分56的边缘对准。板的形状可取决于将要在板中形成的空腔的形状和尺寸。
图6示出了具有可变宽度的边缘部分23的袋20的示例。在图6中,袋20的侧边24_L、24_R和端部25可具有起伏,使得相配比于空腔21的角部周围的边缘部分23,空腔21的侧边周围的边缘部分23更窄。这是因为更多的板材料被拉到空腔21的中心来形成空腔21。为了抵消这种效应,要在其中形成空腔21的板,此处被称为板50(以虚线示出),可以被这样制造,使得在形成空腔21之前,板50在板50的角部51、52附近较窄,而向着板50的每个侧边54_R、54_L的中心较宽。板50可在角部51、52附近具有较短的长度,而在端部55的中心具有较长的长度。板50具有外悬的外部绝缘层(未示出)和核心层(未示出),使得每一层具有类似于图6所示的板50的形状。外部绝缘层的相对的左边缘和右边缘,分别延伸超过核心层的相对的左边缘和右边缘足够远,以为核心层的边缘提供充足的绝缘。当在板50中形成空腔时,更多的板材料可从板50的侧边54_L、54_R和端部55的中心被拉到空腔21的中心,以形成空腔21。这可能会得到空腔部分具有基本上直的侧边和端部的袋(不同于图6所示的袋20)。在形成空腔21并且板50沿着折叠线被折叠而成顶部分56之后,空腔部分的侧边54_L、54_R和端部55将和顶部分56的直的边缘对准。因此,空腔部分处的外悬的外部绝缘层的边缘将和顶部分56处的外悬的外部绝缘层的边缘对准,从而防止核心层被暴露到袋的边缘的周围,并且为核心层提供了电绝缘。板50可以被设计成具有不同于图6所示的形状,这取决于空腔21的尺寸和形状。
如图4所示,密封袋20具有在顶部分22和空腔21处延伸超过核心层12(在顶部分22和空腔21中)的边缘的外部绝缘层13的部分。这可以防止核心层12被暴露到袋20的边缘周围,并且因此提供了对核心层12的电绝缘,而不需要手工处理袋20,例如,通过折叠和将密封边缘周胶带粘到袋20的侧边。取消胶带可以减少电池组大约50微米的总高度,和大约100微米的总宽度。这可以贡献大约1%到2%的额外能量密度(相当于一个更大的电池单元和电极组件)。外部绝缘层13的延伸部分可以被向内折叠(如图4中箭头4所指的反向)并热密封,或以其他方式被粘合在一起(或粘合到袋20的侧边),以提供对核心层12的进一步的保护。
参考图5,袋20可封闭电极组件30。电极组件30包括具有正活性材料制成的涂层的正电极板31,和具有负活性材料制成的涂层的负电极板32。电解液隔板33可被放置在正电极板31和负电极板32之间,以防止正电极板31和负电极板32之间的短路,并且仅允许在正电极板31和负电极板32之间适当的化学传输。其他适合的电池化学的电极组件也是可能的。
正电极片34被粘合到正电极板31,并且突出预定长度以延伸到袋的外部。类似的,负电极片35被粘合到负电极板32,并且突出预定长度以延伸到袋的外部。正电极片34和负电极片35可由下列材料制成,诸如铝、铜或镍。片34和35应当具有足够的厚度和尺寸,以在没有任何明显压降的条件下运载大量的电流。
绝缘套36可以被完装在正电极片34和负电极片35上,以防止电极片34、35和袋20的核心层12(在边缘部分23的外部边缘)之间的短路。绝缘套36应当形成不透气的密封,以防止空气和湿气进入袋20和防止电解液漏出袋20。
图7示出了使用多层板10制造电池组所执行的操作的流程图。制造电池组包括:制备多层层叠板10(框图40),制造袋20(框图41),安装电极组件30(框图42)和密封袋20(框图43)。这些操作已经在上面进行了详细的描述。
为了解释的目的,描述了特定的实施例以提供对本发明透彻的理解。这些不应该构成对本发明范围的限制,而仅仅是示意了本发明不同的示例和方面。应当理解本发明的范围包括没有在上面详细描述的其他实施方式。按照此处所公开的本发明的设备和方法的配置、操作和各种细节,在不脱离本发明如在随附权利要求书中限定的精神和范围的情况下,可以作出对本领域技术人员来说显而易见的各种其他修改、改变和变形。例如,尽管图5示出了袋20包括电极组件30,但是可选的袋20可被用来容纳多个单元,每个单元可被单独地密封。因此,本发明的范围应当由权利要求书及其等同来确定。这样的等同包括当前公知的等同,以及在未来开发的等同,也就是,所开发的执行相目同功能而不考虑结构的元件。此外,不管权利要求书是否对元件、部件或方法步骤进行了明确限定,没有元件、部件或方法步骤是被意图专用于公众的。
Claims (21)
1.一种适于形成电池袋的多层板,包括:
具有第一表面以及和第一表面相对的第二表面的核心金属层;
附于核心金属层的第一表面的密封层;以及
绝缘层,所述绝缘层附于核心金属层的第二表面,并且宽度大于核心金属层的宽度使得绝缘层延伸超过核心金属层的边缘。
2.如权利要求1所述的多层板,其中,核心金属层为铝。
3.如权利要求1所述的多层板,其中,密封层为流延聚丙烯。
4.如权利要求1所述的多层板,其中,绝缘层为尼龙。
5.如权利要求1所述的多层板,其中,板的第一部分和第二部分相对彼此被折叠,以封闭在其中可容纳电极组件的空腔。
6.如权利要求5所述的多层板,其中,第一部分和第二部分被折叠成使得密封层实质上覆盖空腔的整个内部以形成袋,以及绝缘层实质上覆盖袋的整个外部。
7.如权利要求5所述的多层板,其中,第一部分中的密封层被热粘合到第二部分中的密封层,以实质上封闭其中包含电极组件的整个空腔。
8.如权利要求7所述的多层板,其中,第一部分中的绝缘层和第二部分中的绝缘层通过屏蔽核心金属层的边缘,来为核心金属层提供电绝缘。
9.如权利要求1所述的多层板,其中,绝缘层延伸超过核心金属层的两个边缘中的每个边缘大约各200微米。
10.一种电池,包括:
电极组件;和
由分别具有内部金属层和外部绝缘层的第一和第二层叠板部分形成的袋,所述部分核彼此粘结以完全封闭电极组件,其中第一和第二层叠板部分之一的外部绝缘层形成袋的外部衬里,并且延伸超出内部金属层以保护内部金属层的边缘不被暴露。
11.如权利要求10所述的电池,其中,电极组件包括:正电极板和附于正电极板的正电极片,负电极板和附于负电极板的负电极片,以及放置在正电极板和负电极板之间的隔板。
12.如权利要求10所述的电池,其中,层叠板部分的外部绝缘层是尼龙。
13.如权利要求10所述的电池,其中,延伸超出内部金属层的外部绝缘层的外围部分在内部金属层的边缘上被折叠。
14.如权利要求10所述的电池,其中,外部绝缘层通过延伸超过内部金属层的边缘大约200微米,来保护内部金属层的边缘不被暴露。
15.如权利要求10所述的电池,其中,第一和第二层叠板部分是包括形成袋的内部衬里的密封层的单板的折叠部分,以及其中第一部分中的密封层与第二部分中的密封层被热封接触,以密封所述袋。
16.一种用于制造适于形成电池袋的多层板的方法,包括:
制备具有预定宽度的金属层;
制备比金属层宽的绝缘层;
对着金属层放置绝缘层,使得绝缘层的相对的边缘分别延伸超过金属层的相对的边缘;以及
如放置的那样将金属层粘合到绝缘层。
17.如权利要求16所述的方法,其中,绝缘层比金属层大约宽400微米。
18.如权利要求16所述的方法,进一步包括:
制备具有大约金属层的预定宽度的密封层;以及
将密封层粘合到金属层。
19.一种用于制造容纳电极组件的电池袋的方法,包括:
在多层板中形成空腔,所述多层板具有绝缘层、密封层、以及被绝缘层和密封层夹着的核心金属层,其中绝缘层比核心金属层宽,使得绝缘层的外围部分延伸超出核心金属层的暴露边缘;
在空腔中放置电极组件;
折叠多层板,以形成覆盖其中形成空腔的底部分的顶部分;和
通过将预部分中的密封层粘合到底部分中的密封层,密封其中包含电极组件的空腔。
20.如权利要求19所述的方法,进一步包括:
将绝缘层的外围部分折叠,以覆盖核心金属层的暴露边缘。
21.如权利要求19所述的方法,其中密封空腔包括:
将热和压力施加到顶部分和底部分中的绝缘层。
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CN112072013B (zh) * | 2019-05-17 | 2023-12-29 | 宁德时代新能源科技股份有限公司 | 二次电池 |
CN111952655B (zh) * | 2019-05-17 | 2024-01-26 | 宁德时代新能源科技股份有限公司 | 二次电池 |
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CN103579538A (zh) * | 2013-11-14 | 2014-02-12 | 东莞新能源科技有限公司 | 包装封印结构及其制备方法及软包装电池 |
CN103579538B (zh) * | 2013-11-14 | 2016-04-06 | 东莞新能源科技有限公司 | 包装封印结构及其制备方法及软包装电池 |
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CN107293652A (zh) * | 2016-04-11 | 2017-10-24 | 宁德新能源科技有限公司 | 包装封印结构及其制备方法及软包装电池 |
CN107293652B (zh) * | 2016-04-11 | 2020-10-02 | 宁德新能源科技有限公司 | 包装封印结构及其制备方法及软包装电池 |
CN108428812A (zh) * | 2017-02-15 | 2018-08-21 | 宁德新能源科技有限公司 | 包装壳及软包电池 |
CN108428814A (zh) * | 2017-02-15 | 2018-08-21 | 宁德新能源科技有限公司 | 包装膜及软包电池 |
CN108428812B (zh) * | 2017-02-15 | 2021-02-02 | 宁德新能源科技有限公司 | 包装壳及软包电池 |
CN108428814B (zh) * | 2017-02-15 | 2021-09-07 | 宁德新能源科技有限公司 | 包装膜及软包电池 |
CN110622334A (zh) * | 2017-05-10 | 2019-12-27 | 苹果公司 | 具有切口部分的电池盖 |
CN111989795A (zh) * | 2019-03-04 | 2020-11-24 | 株式会社Lg化学 | 二次电池壳体和二次电池 |
CN111989795B (zh) * | 2019-03-04 | 2024-03-26 | 株式会社Lg新能源 | 二次电池壳体和二次电池 |
CN113383460A (zh) * | 2020-09-23 | 2021-09-10 | 宁德新能源科技有限公司 | 电池 |
CN113383460B (zh) * | 2020-09-23 | 2024-03-15 | 宁德新能源科技有限公司 | 电池 |
Also Published As
Publication number | Publication date |
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US20130004835A1 (en) | 2013-01-03 |
CN102848646B (zh) | 2015-09-16 |
TW201304950A (zh) | 2013-02-01 |
US8709645B2 (en) | 2014-04-29 |
US20140196839A1 (en) | 2014-07-17 |
TWI453118B (zh) | 2014-09-21 |
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