CN1123945C - 电池的制造方法 - Google Patents
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Abstract
一种电池的制造方法,包括下述步骤:将电池部件4收容于外包装膜3内,在从外包装膜3的开口部3a注入电解液12之后,将开口部3a密封,其特征在于,将外包装膜3的开口部3a一侧设定成大于规定的形状和尺寸,形成注入电解液12的一次积存区域3c,在注入规定的电解液12之后,将规定的形状和尺寸的区域3d密封,之后将该区域切断,由此,提供一种可大批量生产不仅可实现小型、轻量化,而且可靠性较高的电池。
Description
技术领域
本发明涉及电池的制造方法。
背景技术
在过去,比如,非水溶介质型电池等的二次电池在实际应用场合广泛地用作携带型电话机,摄相机等的电源。另外,随着上述设备类的小形化及高性能化,人们也要求电源用电池的小形化,轻量化,电压提高,容量提高等。与这样的要求相对应,比如,在JP特开平3-230474号文献,JP特开平3-225765号文献等中公开了厚度为1mm的聚合物电池。
即,在这些电池中,在将电池部件以定位、收容于具有开口的一端的外包装膜(外包覆体·袋体)内部之后,对其进行包装。另外,人们知道有下述结构的电池,其中在从上述开口部注入规定的电解液之后,对该开口部进行热熔粘接(熔接),以将其气密地密封。此外,还包括有下述的方法,即当制造上述电池时,夹持上述电池部件,将外包装膜两次折叠,将两侧对接的端缘部之间熔接,实现密封,形成外包装膜。还有,还具有下述场合,即对于电池部件而言,按压呈筒状卷绕的卷装体,使其形成平板状。
图3为电池的主要部分的结构的剖视图,电池部件1是相对的层片状正极1a和层片状负极1b;气密地插装、设置于两个电极1a、1b之间的层片状的电解质系1c;分别与上述电极1a、1b电连接的图中未示出的集电体层片与上述正极1a和负极1b的集电体(图中省略)间隔开,正极端子1a’和负极端子1b’相对外包装膜2延伸设置(引出)。
另外,上述层片状正极1a是以吸收排放锂离子的含有锂的金属氧化物(比如,锂锰复合氧化物,含有锂的钴氧化物)或二氧化锰等作为主成分而形成的。此外,层片状负极1b由锂金属或吸收排放锂的碳素材料和锂合金类等形成,还有,聚合物电解质类1c形成下述的结构,即在由聚丙烯无纺布等形成的隔离基材上,以不浸透的方式保持有例如锂盐等的碳酸亚乙酯溶液等的非水电解液。
这种平板形的二次电池与铅蓄电池或镍镉二次电池相比较,不仅可使容量提高,而且还具有可使重量较轻的特长。
但是,另一方面,确认有下述的不利情况。
即,上述电池是通过在将电池部件1定位地收容在外包装膜2内之后注入规定的电解液而制造的。但是,随着电池容量的提高,电池部件1内部结构变得拥挤,因此使以浸透方式保持电解液的空隙减少。即,为了提高电池的容积效率,要求尽可能地减少外包装膜2内部的空间。然而,将外包装膜2内部的空隙尽可能地减少会对规定量的电解液的注入造成困难,其结果是存在无法浸透保持规定量的电解液,导致电池性能或品质的偏差的问题。
为了消除上述问题的发生,现在采用反复进行多次电解液向收容电池部件1的外包装膜2内部的注入与浸透。但是,在分多次注入电解液的方法中,电解液注入所需要的时间会增加,这样注入电解液成分会挥发,或由于分次注入的电解液造成的注入量误差的累积,从而造成电解液注入量的精度会降低等问题。
发明内容
本发明是针对上述情况而提出的,其目的在于提供一种大批量生产不仅可实现小型、轻量化,而且可靠性较高的电池。
本发明为一种电池的制造方法,包括下述步骤:将电池部件收容于一端开口,形成电解液注入口的外包装膜内;在从上述外包装膜的开口部注入电解液之后,将上述开口部密封;其特征在于,
将上述外包装膜的开口部一侧设定成大于规定的形状和尺寸,形成注入电解液的一次积存区域,在注入规定的电解液之后,将上述规定的形状和尺寸的区域密封,之后将该区域切断。
在上述的电池的制造方法中,为了收容电池部件,可采用以在金属层的两个表面设置有树脂层的叠层膜作为材料的外包装膜。
另外,在上述的电池的制造方法中,上述外包装膜的密封是通过下述方式进行的,即:对至少设置于上述规定形状和尺寸的区域的外侧的密封区域的热熔粘接性树脂进行热熔粘接。
本发明以下述内容主要核心,即,相对电池部件,将一端开口的外包装膜的开口部设定得较长,将其用作从设定得较长的开口部一侧注入电解液时的电解液的一次积存部,之后在规定的形状和尺寸的区域部进行密封与切断。即,在电池制造步骤中,外包装膜制成从制品的最终阶段进行密封与切断的区域向开口部一侧过量延伸地设置有电解液一次积存用的区域。另外,通过将上述延伸设置的外包装膜区域用作电解液积存(漏斗)部,无需复杂的操作或设备等,另外,可高精度地注入一定量的电解液。
在本发明中,作为电池部件,列举出对例如为层片状正极和层片状负极的叠层形或为将层片状正极和层片状负极的卷绕、卷装体进行轧制而形成的板状体,其中,所述正极和负极之间设置有同时用作上述隔离部的层片状电解质。即,该电池部件是以下述层片状正极、层片状负极、聚合物电解质类(比如,六氟丙烯氟化亚乙烯基共聚物等聚合物和锂盐碳酸亚乙酯溶液等非水电解液构成的系列)为材料而形成的,其中,所述层片状正极是在集电体上叠置包含金属氧化物等的活性物质,非水电解液和电解质保持性聚合物的正极而形成的,所述层片状负极是在集电体上叠置包含吸收、排放锂离子的活性物质,非水电解液和电解质保持性聚合物的负极而形成的,所述聚合物电解质类用于保持其具有隔离作用的电解质。
在这里,作为层片状正极的活性物质,可列举出锂锰复合氧化物,二氧化锰,含有锂的钴氧化物,含有锂的镍钴氧化物,含有锂的非晶体五氧化钒,硫族化合物等。此外,作为负极活性物质,可列举出双酚树脂,聚丙烯腈,纤维素等的烧结物,焦碳或沥青的烧结物,也可采用包括天然或人工石墨,碳黑,乙炔黑,石墨化碳黑,镍粉末等的形式。
还有,聚合物电解质类可列举出在六氟丙烯氟化亚乙烯基共聚物,聚丙烯腈衍生物,聚氧化乙烯衍生物等的聚合物电解质、例如碳酸亚乙酯,碳酸亚丙酯,碳酸亚丁酯,碳酸二甲酯,碳酸二乙酯,碳酸甲乙酯等的非水溶剂中溶解有0.2~2mol/l的高氯酸锂,六氟磷酸锂,硼四氟化锂,六氟化砷锂,三氟甲磺酸锂等。
此外,作为层片状正极的集电体,可列举出铝箔,铝网,铝制冷胀合金,铝制冲压金属等,作为层片状负极的集电体,可列举出铜箔,铜网,铜制冷胀合金,铜制冲压金属等。
在本发明中,收容电池部件的外包装膜为一端开口,并且至少密封熔接部是由热熔粘接性树脂形成的袋状体等。即,为密封并引出层片状(板状)的电池部件中的各电极端子、并且具有可收容的宽度和长度的一端开口的形状,另外该长度沿开口部方向比通常的场合大。还有,该外包装膜也可预先制成袋状体,还可将外包装膜两次折叠,在它们之间将电极端子引出,同时夹持电池部件,将外包装膜的两侧对接面之间进行热熔粘接等,在进行装配的过程中形成袋状体。
再有,作为形成外包装膜的膜,可列举出聚酰亚胺树脂膜,聚丙烯树脂膜,考虑到耐湿性而在金属层的两个表面设置树脂层而形成的叠层型等。另外,当形成以这些膜为材料的外包装膜,或对电解液注入后的外包装膜进行熔接与密封时,最好在相互对接、密封的表面之间设置热熔粘接型的粘接剂层,或采用至少将相互对接、密封的表面预先作为形成热熔粘接型的树脂层的膜。
按照本发明,由于在聚合物电池的制造步骤中,可以容易并且高精度地注入规定量的电解液,所以能以较高的合格率制造高品质的电池。即,将外包装膜的局部用作电解液的注入积存部,在供给规定量的电解液后,即使在连续的制造步骤中,也无需操作的中断或操作的切换等。另外,即使电池部件等的电解液注入区域结构拥挤,电解液的浸透性降低的情况下,由于可在此状态进行减压浸透处理,所以可保持良好的生产性,此外由于可注入一定量的电解液,从而可提供高品质的电池。
附图说明
图1为表示实施例中电池部件4定位收容于外包装膜中的状态的主视图。
图2A为依步骤顺序表示实施例中的状态的示意图。
图2B为依步骤顺序表示实施例中的状态的示意图。
图2C为依步骤顺序表示实施例中的状态的示意图。
图3为聚合物电池的主要部分的结构的剖面图。
具体实施方式
下面参照图1和图2A~C对实施例进行描述。
图1为表示电解液的注入操作之前的电池的主要部分结构的主视图。即,图1表示下述状态,在该状态,电池部件4收容于外包装膜3内,该外包装膜3的一端具有形成电解液注入口的开口3a,相对所收容的电池部件4,外包装膜3以更长的尺寸形成。
在这里,外包装膜3由叠层膜制成,该叠层膜为在例如铝箔的两个表面(两个主表面)上设置聚对苯二甲酸乙二醇酯树脂层,另外在其中的一个聚对苯二甲酸乙二醇酯树脂层的面上设置有热熔粘接性树脂层(比如,聚丙烯树脂层)。此外,该外包装膜3按照下述方式制成,即:使上述热熔粘接性树脂层相对,以夹持电池部件4的方式将它们叠置,使构成电解液注入口的一端部形成开口3a,以热熔粘接的方式将另一端缘部3b密封。
还有,在收容于上述外包装膜3内的电池部件4中,相对的层片状正极和层片状负极,以密封方式设置于这两个电极之间的层片状的电解质系,分别与上述层片状的两个电极电连接的集电体层片与上述层片状的正极的集电体间隔开,相应的电极端子4a、4b由外包装膜3密封,延伸设置(引出)。
下面对相对以定位方式收容上述电池部件4的外包装膜3的电解液的注入进行描述。图2A以示意方式表示电解液注入步骤的实施例。在图2A中,标号5表示减压腔,标号6表示收容保持件,其收容保持以定位方式收容聚合物电池部件4的外包装膜3,标号7表示注入电解液的喷嘴,标号8表示定量供给电解液的定量泵,标号9表示电解液罐,标号10表示使减压腔5中的压力降低的真空泵,标号11表示减压与常压切换阀。
在上述减压腔5内的收容保持件6中,在将以定位方式收容电池部件4的外包装膜3设置好后,使真空泵10动作,使减压腔5的内部压力降低。在减压腔5内部的减压度到达规定值后,通过定量泵8从电解液罐9中测定的电解液12由喷嘴7注入到外包装膜3的开口部3a。在这里,如果对切换泵11进行操作,使减压腔5内部返回到常压状态(大气压),则注入到外包装膜3的开口部3a的电解液12以电池部件4的上方空间部作为电解液的一次液体积存部3c,依次注入浸透于电池部件4中。
在规定量的电解液注入完毕后,从减压腔5中取出以定位方式收容电池部件4的外包装膜3。在这里,从减压腔5将以定位方式收容电池部件4的外包装膜3的取出也可在将电解液注入外包装膜3的液体积存部3c时进行,此后,放置一定时间,以自然落下的方式实现浸透。
按照上述方式,在注入浸透规定量的电解液之后,如图2B所示,通过热熔粘接方式将外包装膜3的开口部3a的端侧密封。即,通过热熔粘接方式将在从以定位方式收容的电池部件4朝向外方延伸的外包装膜3的开口部3a一侧,并且靠近上述电池部件4的区域3d密封。接着,如图2C所示,通过将上述经由热熔粘接而密封的外包装膜3在保留区域3d的状态下切断、分离,获得具有规定尺寸和形状,符合规格尺寸的电池。
另外,本发明不限于上述的实施例,在不脱离发明的实质范围内,可采用各种变形形式。比如,也可将外包装膜的形成材料改为其它的材料,另外外包装膜也可在电池部件的嵌入步骤中,通过将外包装膜折叠而热熔粘接或粘接剂的粘接作用等形成。还有,本发明不限于聚合物电池等的电池部件。
再有,上述实施例按照下述方式构成,即:在将电池设置于腔内后,使腔内的压力降低,然后注入电解液,但是也可按照下述方式构成,即:在将电池设置于腔内后,注入电解液,此后,使腔内的压力降低。
按照本发明,由于可以较高的精度注入浸透一定量的电解液,这样可以较高的合格率提供高品质的电池。即,外包装膜的长度大于电池部件,采用其一部分形成电解液的一次积存部,将电解液注入填充于该积存部中,由此便容易地,并且确实地实现一定量的电解液的注入填充。还有,在该电解液的注入与填充步骤中,省略比如注入用漏斗的装拆等的操作,并且也不会产生电解液的浪费或泄漏等情况。因此,能以低成本提供高合格率、高品质的电池。
虽然针对最佳的实施例对本发明进行了描述并给出了图示,但是本领域的普通技术人员应知道,在不离开本发明的实质范围的情况下,可对其具体结构和形式进行前述和各种其它的变换、省略和添加。
Claims (11)
1.一种电池的制造方法,包括下述步骤:将电池部件收容于一端开口,形成电解液注入口的外包装膜内;在从上述外包装膜的开口部注入电解液之后,将上述开口部密封;其特征在于,
在上述外包装膜上设置有从收容上述电池部件的收容部区域向上述开口部一侧延伸设置的电解液一次积存区域,以便一次积存所注入的电解液,将规定量的电解液注入上述一次积存区域,并使其含浸在上述电池部件中后,密封上述电池部件收容部区域,并将包含上述一次积存区域的开口部一侧的外包装膜切断、除去。
2.根据权利要求1所述的电池的制造方法,其特征在于,上述外包装膜由在金属层的两个表面设置有树脂层的叠层膜形成。
3.根据权利要求1所述的电池的制造方法,其特征在于,上述外包装膜的密封是通过对设置在上述外包装膜的密封区域上的热熔粘接性树脂进行热熔粘接进行的,所述密封区域至少与上述电池部件收容部邻接地设置在开口部一侧上。
4.一种电池的制造方法,其特征在于,包括下述步骤:
将电池部件收容在外包装膜的收容区域中;
上述外包装膜为在一端具有开口部,而另一端具有封闭的底部,收容电池部件的袋状的外包装膜,上述外包装膜在靠近上述底部的位置具有收容上述电池部件的收容区域,在上述电池部件收容区域和上述开口部之间具有注入电解液的一次积存区域,从上述外包装膜的开口部注入规定量的电解液;
由上述一次积存区域与上述电池部件收容区域之间的密封区域密封上述外包装膜;
在上述密封区域将上述外包装膜切断。
5.根据权利要求4所述的电池的制造方法,其特征在于,上述外包装膜由在金属层的两个表面设置有树脂层的叠层膜形成。
6.根据权利要求4所述的电池的制造方法,其特征在于,上述外包装膜的密封是通过下述方式进行的,即:将至少设置于密封区域的热熔粘接性树脂热熔粘接。
7.根据权利要求4所述的电池的制造方法,其特征在于,从上述外包装膜的开口部注入规定量的电解液是通过下述方式进行的,即:在将保持在降压室内的上述外包装膜保持在压力降低的状态下,从连通在设置于上述降压室的外部的电解液罐上的喷嘴向上述开口部供给上述电解液。
8.一种电池的制造方法,其特征在于,包括下述步骤:
在一端具有开口部,而另一端具有封闭的底部,收容电池部件的袋状的外包装膜中,在上述底部与上述开口部之间的靠近上述底部的位置上具有收容电池部件的收容部,将电池部件收容在外包装膜的上述收容部中;
在上述收容部和上述开口部之间具有所注入电解液的一次积存区域,在将上述外包装膜保持在压力降低的状态下,从上述外包装膜的开口部注入电解液;
将上述外包装膜维持在常压下,通过使上述电解液自然落下,使其浸透于上述电池部件中;
由上述一次积存区域和上述收容部之间的密封区域密封上述外包装膜;
在上述密封区域将上述外包装膜切断。
9.根据权利要求8所述的电池的制造方法,其特征在于,上述外包装膜由在金属层的两个表面设置有树脂层的叠层膜形成。
10.根据权利要求8所述的电池的制造方法,其特征在于,上述外包装膜的密封是通过下述方式进行的,即:对至少设置于上述密封区域的热熔粘接性树脂进行热熔粘接。
11.根据权利要求8所述的电池的制造方法,其特征在于,从上述外包装膜的开口部注入电解液是通过下述方式进行的,即:在将上述外包装膜保持在降压室内、并将上述外包装膜维持在压力降低的状态下,从连通在设置于上述降压室的外部的电解液罐上的喷嘴向上述开口部供给上述电解液。
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JP5778601B2 (ja) * | 2012-02-29 | 2015-09-16 | 積水化学工業株式会社 | 電気モジュールの製造方法 |
DE102012109032B4 (de) * | 2012-09-25 | 2019-11-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Verfahren zum Befüllen elektrochemischer Zellen |
WO2015016008A1 (ja) * | 2013-07-31 | 2015-02-05 | Necエナジーデバイス株式会社 | 二次電池の製造方法 |
KR20150030861A (ko) | 2013-09-13 | 2015-03-23 | 주식회사 엘지화학 | 파우치형 케이스, 전지셀 및 전지셀의 제조방법 |
US20150303538A1 (en) * | 2014-04-17 | 2015-10-22 | Cyntec Co., Ltd. | Compact battery with high energy density and power density |
KR101755161B1 (ko) * | 2016-08-08 | 2017-07-06 | 주식회사 엘지화학 | 파우치형 케이스, 전지셀 및 전지셀의 제조방법 |
CN110282173A (zh) * | 2019-06-20 | 2019-09-27 | 湖北金泉新材料有限责任公司 | 一种卷芯的包覆方法及电池 |
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JPH0821393B2 (ja) | 1990-01-29 | 1996-03-04 | 株式会社ユアサコーポレーション | 集合電池 |
JPH03230474A (ja) | 1990-02-02 | 1991-10-14 | Yuasa Battery Co Ltd | 集合電池 |
US5916704A (en) * | 1997-10-10 | 1999-06-29 | Ultralife Batteries | Low pressure battery vent |
US6048638A (en) * | 1998-05-29 | 2000-04-11 | Motorola, Inc. | Flexible battery |
US6207318B1 (en) * | 1998-06-22 | 2001-03-27 | Eagle-Picher Energy Products Corporation | Electrochemical batteries with restricted liquid electrolyte volume |
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1999
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- 2000-04-25 US US09/557,774 patent/US6371996B1/en not_active Expired - Fee Related
- 2000-04-25 KR KR1020000021903A patent/KR100362552B1/ko not_active IP Right Cessation
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TW463406B (en) | 2001-11-11 |
KR100362552B1 (ko) | 2002-11-27 |
JP4187870B2 (ja) | 2008-11-26 |
CN1271972A (zh) | 2000-11-01 |
US6371996B1 (en) | 2002-04-16 |
JP2000311661A (ja) | 2000-11-07 |
KR20000077082A (ko) | 2000-12-26 |
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