CN101355181B - 袋状锂二次电池 - Google Patents
袋状锂二次电池 Download PDFInfo
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- CN101355181B CN101355181B CN200810130198XA CN200810130198A CN101355181B CN 101355181 B CN101355181 B CN 101355181B CN 200810130198X A CN200810130198X A CN 200810130198XA CN 200810130198 A CN200810130198 A CN 200810130198A CN 101355181 B CN101355181 B CN 101355181B
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- positive electrode
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 84
- 238000007789 sealing Methods 0.000 claims abstract description 26
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 239000005030 aluminium foil Substances 0.000 claims description 7
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000007773 negative electrode material Substances 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000007774 positive electrode material Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 68
- 230000007797 corrosion Effects 0.000 description 13
- 238000005260 corrosion Methods 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 238000003475 lamination Methods 0.000 description 8
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
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- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000011244 liquid electrolyte Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 240000004859 Gamochaeta purpurea Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 230000004927 fusion Effects 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- 201000004792 malaria Diseases 0.000 description 1
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Abstract
一种袋状锂二次电池,包括:电池单元,该电池单元包括正电极板、负电极板,以及设置在正电极板和负电极板之间的隔板;与正电极板电连接的正电极接头;与负电极板电连接的负电极接头;具有容纳电池单元的空间和围绕该空间的密封边缘的壳体;以及向正电极接头和壳体施加正电极电压的正电极电压施加单元其中,所述壳体包括包含有金属薄膜的中间层,以及分别覆盖在中间层的相对表面上的内、外层,并且所述正电极电压施加单位包括导电销,以将壳体和正电极接头电连接。
Description
本申请是于2004年6月24日提交的同名中国专利申请200410069462.5的分案申请。
技术领域
本发明涉及锂二次电池,尤其涉及具有改进结构的袋状锂二次电池,使得同等的电压施加于壳体和正电极接头。
背景技术
一般而言,与一次电池不同,由于例如数码相机、移动电话、笔记本电脑等便携式电子设备的发展,对可充电二次电池的研究已经非常广泛。二次电池包括镍-镉电池、镍-金属氢化物电池、镍-氢电池、锂二次电池等。
锂二次电池的工作电压是镍-镉电池或镍-金属氢化物电池的三倍,锂二次电池通常具有3.6V或更高的工作电压,通常用作便携式电子设备的电源。每单位重量的锂二次电池还具有更高的能量密度。近来在便携式电子设备中锂二次电池使用量的增加就是因为这些优点。
锂二次电池可根据所用电解质的类型分为液体电解质电池和聚合物电解质电池。一般来说,含有液体电解质的锂二次电池被称作锂离子电池,含有聚合物电解质的锂二次电池被称作锂聚合物电池。
锂二次电池可制造成各种形状。锂离子电池通常制造成圆柱形或棱柱形。近来,更多的注意力集中在可容纳在挠性袋中的锂聚合物电池。锂聚合物电池操作安全、重量轻,因此适用于体积小、重量轻的便携式电子设备。
参见图1,常规的袋状锂二次电池10包括电池单元11和提供用于容纳电池单元11的空间12a的壳体12。
通过沿一个方向卷绕正电极板、隔板和负电极板的叠层的方式、或者通过反复层叠正电极板、隔板和负电极板的方式形成电池单元11。电池单元11的正电极板和负电极板分别电连接到正电极接头13和负电极接头14。
正电极接头13和负电极接头14的每一个的端部经过壳体12的密封部分12b,延伸到壳体12的外部。正电极接头13和负电极接头14向外延伸的端部连接到保护电路板的端口(未示出)。
位于壳体12的密封部分12b的正电极接头13和负电极接头14的每一个的一部分用密封带15缠绕以防止电短路。
壳体12是由中间金属箔和贴在中间金属箔的相对表面上的内、外绝缘膜构成的袋子,这种袋状壳体非常有柔性。
壳体12具有用于容纳电池单元11的空间12a,如上所述。围绕空间12a的边缘形成可热熔的密封部分12b。
图2A是沿图1中的线I-I取向的截面放大图。图2B是图2的局部放大图。
参见图2A和2B,壳体12由金属箔例如铝箔制成的中间层12c和贴在中间层12c的相对面上作为保护层的内层12d和外层12e构成的复合膜制成。
在壳体12的空间12a中装入包括相互层叠的正电极板11a、隔板11c和负电极板11b的卷状物的电池单元11。正电极接头13和负电极接头14分别从正电极板11a和负电极板11b引出,如图1所示。如上所述,正电极接头13和负电极接头14的每一个的端部露出到壳体12的外部,用密封带15缠绕位于密封部分12b中的正电极接头13和负电极接头14的每一个的一部分。
在具有上述结构的袋状锂二次电池10的制造过程中,正电极板11a和负电极板11b分别电连接到正电极接头13和负电极接头14,并将正电极板11a、隔板11c和负电极板11b的叠层卷绕起来以形成电池单元11。
在进行伸长步骤使得各正电极接头13和负电极接头14的端部露出壳体12之外以后,将电池单元11放置在壳体12的空间12a中。
在此状态下,将预定量的热量和压力施加到壳体12的密封部分12b,完成袋状锂二次电池10的制造。对袋状锂二次电池10进行包括充电、老化、放电等的一系列的化成工艺,使袋状锂二次电池10在结构上稳定,并确定它是否正常工作。
然而,常规袋状锂二次电池10具有下述问题。
在对作为由绝缘内层12d、金属中间层12c和绝缘外层12e构成的复合膜的壳体12进行构形时在内层12d中出现了小缝隙的情况下,在运转电池10时正电极接头13和负电极接头14会电连接到中间层12c。
当由于内层12d的损坏造成由镍板制成的负电极接头14接触由铝制成的中间层12c的时候,这是尤为严重的问题,这是因为壳体12就具有了负电位。结果,在电池工作时,由于在中间层12c和来自电解液并粘接到中间层12c表面的锂离子之间的电位差,造成了中间层12c不能再由内层12d保护而腐蚀。
随着壳体12的逐渐腐蚀,中间层12c分解,在壳体12中形成缝隙并让外部空气经过该缝隙进入壳体12中。
随着潮湿的空气进入壳体12中,在空气中的水分与处于充电状态的电池单元11反应,尤其是与电池单元11的负电极板11b反应,并产生气体。产生的气体可使壳体12膨胀并打开锂二次电池10的电池组的密封部分12b。
因此,在制成锂二次电池10之后的化成工艺中,需要检查是否由于内层12d的损坏而造成了在中间层12c和负电极接头14之间的电接触。
然而,甚至在由于在中间层12c和负电极接头14之间的电接触造成袋状锂二次电池10严重腐蚀和膨胀的时候,人们也会根据从化成工艺中测出的袋状锂二次电池10的电压值而确定它处于正常充电状态。换句话说,不可能精确判断袋状锂二次电池10是否正常工作。此外,锂二次电池10的膨胀引起电池组的变形。
发明内容
本发明提供一种袋状锂二次电池,该电池具有电连接到袋状壳体的正电极板,从而响应于在电池工作时壳体的损坏造成的电池单元的负电极板接触壳体会引起短路。因此,在电池开路电压中的变化是可检测到的,更容易检测出袋状锂二次电池的故障。
本发明的其它方案和/或优点部分列在下面的说明书中,部分从说明书中就很容易看出,或可通过对本发明的实践得知。
根据本发明,提供了一种袋状锂二次电池,其包括:
电池单元,该电池单元包括正电极板、负电极板,以及设置在正电极板和负电极板之间的隔板;
与正电极板电连接的正电极接头;
与负电极板电连接的负电极接头;
具有容纳电池单元的空间和围绕该空间的密封边缘的壳体;以及
向正电极接头和壳体施加正电极电压的正电极电压施加单元,
其中,所述壳体包括包含有金属薄膜的中间层,以及分别覆盖在中间层的相对表面上的内、外层,并且
所述正电极电压施加单元包括导电销,以将壳体和正电极接头电连接。
壳体可包括:包含金属薄膜的中间层;和分别覆盖在中间层的相对表面的内、外层。通过露出一部分中间层并将中间层的露出部分和正电极接头电连接,从而形成正电极电压施加单元。作为选择,通过去除壳体的一部分内层以露出一部分中间层并使正电极接头的外表面与中间层的露出部分接触,从而形成正电极电压施加单元。通过使正电极接头的外表面与壳体中间层的外部露出边缘接触,从而形成正电极电压施加单元。
附图说明
根据下面结合附图对实施方式的以下描述,本发明的这些和/或其它方面和优点将更为明显并且更容易理解,其中:
图1是常规二次电池的平面图;
图2A是沿图1的线I-I截取的截面图;
图2B是图2A的局部放大图;
图3A是根据本发明实施方式的袋状锂二次电池的分解透视图;
图3B是图3A中的电池单元的放大图;
图3C是图3A中的壳体的放大图;
图4A是在图3A中形成正电极接头的区域的局部放大截面图;
图4B是图4A的局部放大截面图;
图5是根据本发明另一实施例的袋状锂二次电池的分解透视图;
图6A是在图5中形成正电极接头的区域的局部放大截面图;
图6B是图6A的局部放大截面图;
图7A是在图5中形成负电极接头的区域的局部放大截面图;
图7B是图7A的局部放大截面图;和
图8是根据本发明的再一个实施例的袋状锂二次电池的分解透视图。
具体实施方式
现在参考本发明的实施方式详细描述本发明,在附图中描述了本发明的实施例,其中相同的参考标记通篇代表相同的元件。下面参考附图描述实施方式,从而解释本发明。
图3A表示根据本发明实施方式的锂二次电池30。图3B和3C分别是图3A中的电池单元31和壳体310的详细图。
参见图3A至3C,锂二次电池30包括电池单元31和容纳电池单元31的壳体310。电池单元31包括正电极板32、负电极板33和插在正电极板32和负电极板33之间、以使电极板彼此绝缘的隔板34。电池单元31可具有胶卷型结构,在这种结构中,将正电极板32、隔板34和负电极板33的单个叠层卷绕起来,或者把包括正电极板32、隔板34和负电极板33的多个叠层的层叠结构卷绕起来。参照胶卷型电池单元描述这种实施方式。
用包含锂氧化物基粘合剂、导电剂等的正电极活性材料层涂覆由条状薄金属板例如铝箔制成的正电极集电器,由此形成正电极板32。正电极接头35电连接到正电极板32。正电极接头35可由铝板制成,并用正电极密封带36缠绕。
用包含碳基粘合剂、导电剂等的负电极活性材料层涂覆由条状薄金属板例如铜箔制成的负电极集电器,由此形成负电极板33。负电极接头37电连接到负电极板33。负电极接头37可由镍板制成,并用负电极密封带38缠绕。
在正电极板32和负电极板33之间插入至少一个隔板34以便绝缘。隔板34可由聚乙烯膜、聚丙烯膜或聚乙烯-聚丙烯复合膜制成。隔板34可具有比正电极板32和负电极板33更宽的宽度,从而防止在正电极板32和负电极板33之间短路。
壳体310包括上壳体320和连接到上壳体320的下壳体330,从而形成密封空间。可将各上壳体320和下壳体330的至少一个边缘固定地连接在一起。当上壳体320和下壳体330连接在一起时,壳体310可具有六面体形状。
下壳体330具有容纳电池单元31的空间331和围绕空间331的下密封边缘332。上壳体320具有对应于下密封边缘332的上密封边缘322。在将电池单元31放入空间331中之后,可将上密封边缘322和下密封边缘332热熔合以密封壳体310。
上壳体320和下壳体330可由基本上相同的材料制成。壳体310可包括由柔性金属例如铝箔制成的中间层340,通过在中间层340的内表面上涂覆聚合物而形成为防护层、以防止与电解质反应的内层350,以及通过在中间层340的外表面上涂覆聚合物而形成为防护层、以防止中间层340暴露于空气中的外层360。
根据本发明实施方式的袋状锂二次电池30的特点在于,借助正电压施加单元将正电位施加于与正电极板32电连接的正电极接头35和壳体310的中间层340。
图4A是图3中的袋状锂二次电池的局部截面图,图4B是图4A的局部放大截面图。
参见图4A和4B,电池单元31容纳在壳体310中,该电池单元31通过卷绕正电极板32、隔板34和负电极板33的叠层而形成。在围绕容纳电池单元31的空间331的上壳体320的上密封边缘322和下壳体330的下密封边缘332之间,设置连接到正电极板32的正电极接头35和连接到负电极板33的负电极接头37(参见图3A)。
各正电极接头35和负电极接头37的端部伸出到已经通过施加热量和压力而热熔合的上壳体320和下壳体330之外。各正电极接头35和负电极接头37接触上密封边缘322和下密封边缘332的一部分用密封带38缠绕。这部分正电极接头35用正电极密封带36缠绕,这部分负电极接头37用负电极密封带38缠绕。
通过正电极电压施加单元将正电极接头35电连接到壳体310。特别是,位于上密封边缘322和下密封边缘332之间的正电极接头35的未缠绕部分35a没有用正电极密封带36缠绕,直接接触下密封边缘332。位于未缠绕部分35a的两侧上的正电极接头35的部分分别用第一和第二正电极密封带部分36a和36b缠绕。作为选择,当用密封带36缠绕正电极接头35时,位于上、下密封边缘322和332之间的正电极接头35的一侧部分可保持不缠绕。
对应于正电极接头35的未缠绕部分35a的一部分壳体310没有内层350,这样由金属薄膜例如铝箔制成的中间层340的露出部分341就与正电极接头35的未缠绕部分35a电连接。
为了使正电极接头35的未缠绕部分35a和中间层340的露出部分341之间更好地进行接触,正电极接头35的未缠绕部分35a可向下弯曲,形成凹部35b。凹部35b的顶点接触中间层340的露出部分341。
由于正电极接头35的凹部35b与壳体310的中间层340的露出部分341电连接,因此当电池工作时就将相同的正电极电位施加于正电极接头35和中间层340。与正电极接头35不同,负电极接头37位于上、下密封边缘322和332之间的部分完全用负电极密封带38缠绕起来。
如上所述,在根据本发明实施方式的袋状锂二次电池30中,壳体310与正电极接头35电连接并具有正电极电压,但与负电极接头37绝缘。
通过对正电极接头35的未缠绕部分35a进行弯曲,由此形成了凹部35b,所述凹部35b是通过用第一、第二正电极密封带部分36a和36b卷绕在未缠绕部分35a的两侧上的上述部分而得到的。可通过刮去或通过控制热熔合处理中的温度而形成中间层340的露出部分341。
图5表示根据本发明另一实施方式的锂二次电池50。图6A是图5的局部截面图,表示在袋状锂二次电池50中的正电极接头55。图6B是图6A的局部放大图。
参见图5,锂二次电池50包括电池单元51和容纳电池单元51的壳体510。电池单元51包括以胶卷或叠层结构的正电极板52、隔板54和负电极板53。正电极接头55从正电极板52中伸出并用正电极密封带56缠绕。负电极接头57从负电极板53中伸出并用负电极密封带58缠绕。正电极接头55可由铝板制成。负电极接头57可由镍板制成。
壳体510包括上壳体520和连接到上壳体520的下壳体530。当利用至少一条铰接公共边连接在一起时,上壳体520和下壳体530可形成六面体。下壳体530具有容纳电池单元51的空间531和围绕该空间531的下密封边缘532。上壳体520具有对应于下密封边缘532的上密封边缘522。如图6B所示,壳体510可包括由挠性金属例如铝箔制成的中间层540、通过在中间层540的内表面上涂覆聚合物而形成的内层550、以及通过在中间层540的外表面上涂覆聚合物而形成的外层560。
伸出到壳体510之外的各正电极接头55和负电极接头57的端部分别电连接到在保护电路板60中的正电极引线61和负电极引线62,所述保护电路板60被安装成当电池过充电时切断电流。
由于袋状锂二次电池50的正电极接头55连接到保护电路板60,因此可通过外部正电极电压施加单元将正电极电压施加给壳体510。
参见图6A和6B,把通过卷绕正电极板52、隔板54和负电极板53的叠层而形成的电池单元51装入壳体510中。正电极接头55的端部从上壳体520的上密封边缘522和围绕容纳电池单元51的下壳体530的空间531形成的下密封边缘532之间伸出到壳体510之外。
在密封的上、下壳体520和530之间、伸出的正电极接头55的端部用正电极密封带56缠绕。正电极接头55的伸出端部朝着壳体510至少折叠一次,并电连接到在保护电路板60中的正电极引线61上。
伸出上、下密封边缘522和532之外预定长度的正电极接头55的折叠未缠绕部分55a没有用正电极密封带56缠绕。作为进行切割以形成壳体510的结果,露出了与上、下密封边缘522和532对齐的壳体510的中间层540的边缘541。
折成与保护电路板60连接的正电极接头55的未缠绕部分55a与中间层540的边缘541电连接。为了在正电极接头55和壳体510之间更稳定地电连接,可局部地去除在下密封边缘532之上的壳体510的外层560的一部分,从而使正电极接头55的未缠绕部分55a与通过外层560的去除部分露出的壳体510的中间层540电连接。
如上所述,由于伸出到壳体510之外的正电极接头55的未缠绕部分55a与中间层540的边缘541或通过外层560的去除部分露出的中间层540的另一部分电连接,因此当电池工作时可将相同的正电极电位施加于正电极接头55和壳体510。
与正电极接头55不同,负电极接头57与壳体510绝缘,如图7A和7B所示。尤其是,负电极接头57在围绕容纳电池单元51的空间531的上、下密封边缘522和532之间伸出到壳体510之外。负电极接头57的端部伸出到密封的上、下壳体520、530之外并用负电极密封带58卷绕。与正电极接头55一样,用负电极密封带58缠绕的负电极接头57的伸出端朝着壳体510至少折叠一次,并电连接到在保护电路板60中的负电极引线62。
然而,与正电极接头55不同,对应于中间层540的边缘541的负电极接头57的折叠部分57a完全用负电极密封带58缠绕以与壳体510绝缘。负电极接头57没有与壳体50的中间层540的边缘541电连接,即使当折叠后以与保护电路板60连接时也是如此。
如上所述,在根据本发明的这种实施方式的、图5中的袋状锂二次电池50中,壳体510与正电极接头55电连接并具有正电极电压,但与负电极接头57绝缘。
图8是根据本发明再一实施方式的袋状锂二次电池的局部截面图。参见图8,将通过卷绕正电极板82、隔板84和负电极板83的叠层而形成的电池单元81装入壳体830中。连接到正电极板82的正电极接头85经由围绕着容纳电池单元81的壳体830中的空间831而形成的密封的上、下密封边缘822和832伸出到壳体830之外。用正电极密封带86缠绕位于上、下密封边缘822、832之间的一部分正电极接头85,从而当上、下密封边缘822、832热熔合时提供更紧密的密封。
正电极接头85通过正电极电压施加单元与壳体830电连接。正电极电压施加单元包括导电销800,导电销800穿过壳体830和正电极接头85。由铝箔制成的壳体830的中间层通过导电销800与正电极接头85电连接。结果,当电池工作时,正电极电压可同时施加于壳体830和正电极接头85。虽然未示出,但负电极接头与壳体830绝缘。
在下面的实施例中,对具有上述结构的袋状锂二次电池进行电压测量和腐蚀试验,这些电压测量和腐蚀试验经常在化成工艺中进行。结果如下。
{实施例1至3}
制造图3A至4B中所示的袋状锂二次电池30。通过卷绕正电极板32、隔板34和负电极板33的叠层、然后放入壳体310的空间331中,由此制成了胶卷型电池单元31。连接到电池单元31的各正电极接头35和负电极接头37的端部经由上、下密封边缘322和332伸出到壳体310之外。
用正电极绝缘条36部分地卷绕经由上、下密封边缘322、332伸出的正电极接头35,从而露出未缠绕部分35a。在上、下密封边缘322、332之间的负电极接头37的一部分完全用负电极绝缘条38卷绕。
在正电极接头35的未卷绕部分35a中形成凹部35b。将对应于凹部35b的、壳体310的一部分内层350除去,以使凹部35b接触在内层350的去除部分下面的中间层340,从而使正电极接头35与壳体310电连接。
将壳体310的上、下密封边缘322、332在压力下热密封以提供袋状锂二次电池30。
{对比例1至3}
除了伸出到壳体之外的正电极接头和负电极接头分别用正电极绝缘带和负电极绝缘带完全缠绕、没有形成凹部以及没有去除壳体的内层之外,以与实施例1相同的方式制造袋状锂二次电池,这样正电极接头和负电极接头都与壳体绝缘。
采用在实施例1至3和对比例1至3中制造的袋状二次电池,测量相对于时间和腐蚀程度的开路电压(OCV)。此外,观察到膨胀是否发生。如果在袋状二次电池中出现了腐蚀或膨胀,由于在壳体中产生了微裂纹,因此在负电极接头和壳体之间的短路更易发生。
结果示于表1中。
表1
如表1所示,在刚刚制成后,根据本发明实施方式的实施例1至3的袋状锂二次电池分别具有4.1840V、4.1844V和4.1841V的开路电压,在它们的外观上没有变化。在制成1天后,实施例1至3的袋状锂二次电池分别具有4.1838V、4.1819V和4.0169V的开路电压,仅在实施例3中出现局部腐蚀。在制成5天后,实施例1至3的袋状锂二次电池分别具有4.1835V、1.8200V和0.8560V的开路电压,在三个电池中都没有出现膨胀。但在实施例2和3中制造的锂二次电池中出现了局部腐蚀。
从上面可以看出,在制成1天之后,在实施例1至3的袋状锂二次电池的开路电压中都没有大的变化。然而,在5天之后出现腐蚀,在实施例3的锂二次电池中的开路电压从约4.2V降至约1.82V。这是因为壳体的内层通过腐蚀损坏。内层的损坏使具有与正电极接头相反极性的负电极接头与被施加了正电极电压的壳体的中间层接触,由此引起短路。
据了解,根据本发明的实施方式制造的袋状锂二次电池中没有膨胀是因为由短路引起的电池放电。由于出现短路而使锂二次电池放电,锂离子迁移到正电极板,在负电极板中没有反应,因此即使在锂二次电池暴露于水分中时也不会产生气体。
如上所述,根据本发明的实施方式,在实施例1至3的袋状锂二次电池中,由壳体内层的损坏而造成的电位腐蚀可由开路电压的变化测量出来。此外,在根据本发明实施方式的袋状锂二次电池中,即使在它们的壳体腐蚀时,也没有出现膨胀。
同时,如表1中所示,在对比例1至3中制造的袋状锂二次电池分别具有4.1846V、4.1847V和4.1823V的开路电压,在其外观上没有变化。在制成1天后,对比例1至3的锂二次电池的开路电压相对保持稳定,分别为4.1837V、4.1846V和4.1822V。此外,三个锂二次电池中有两个腐蚀。即使在制成5天后,对比例1至3的锂二次电池的开路电压仍相对稳定,分别为4.1832V、4.1841V和4.1817V。此外,对比例1至3的所有锂二次电池都腐蚀和膨胀。
如上所述,在常规袋状锂二次电池中,甚至在制成达5天后在开路电压方面也没有变化。然后,对于所采用的常规电池,在充电状态中水分渗入锂二次电池并通过与正电极板的反应产生气体,因此使常规电池膨胀。换句话说,常规袋状锂二次电池的问题在于,甚至在它们膨胀时,它们的开路电压也几乎恒定,这意味着不可能精确地确定常规电池的工作是否正常。
根据如上所述的本发明的实施方式的袋状锂二次电池具有以下作用。
首先,由于将正电极电压同时施加于壳体的金属中间层和电池的正电极接头,因此当由于壳体内层的损坏而使负电极接头接触壳体的金属中间层时容易引起短路,从而能够检测开路电压的变化,筛选出出现故障的二次电池。
其次,即使当锂二次电池的袋状壳体腐蚀时,在由于短路而引起放电的锂二次电池的负电极板中没有反应发生,这样能够防止膨胀,确保锂二次电池的安全。此外,容纳锂二次电池的电池组的熔合密封部分没有因膨胀而破裂,但仍保持密封。
虽然已经示出并描述了本发明的几个例子,但很显然,本领域技术人员也可以在不脱离本发明的原理和精神的条件下对这些实施例进行修改,本发明的范围由权利要求书和其等同物加以限定。
Claims (10)
1.一种袋状锂二次电池,包括:
电池单元,该电池单元包括:
正电极板;
负电极板;和
设置在正电极板和负电极板之间的隔板;
与正电极板电连接的正电极接头;
与负电极板电连接的负电极接头;
具有容纳电池单元的空间和围绕该空间的密封边缘的壳体;以及
向正电极接头和壳体施加正电极电压的正电极电压施加单元,
其中,所述壳体包括包含有金属薄膜的中间层,以及分别覆盖在中间层的相对表面上的内、外层,并且
所述正电极电压施加单元包括导电销,以将壳体和正电极接头电连接。
2.根据权利要求1的袋状锂二次电池,其特征在于,该导电销穿过正电极接头和至少一部分壳体。
3.根据权利要求1的袋状锂二次电池,其特征在于,该壳体的中间层包括铝箔。
4.根据权利要求1的袋状锂二次电池,其特征在于,该正电极接头包括铝板。
5.根据权利要求1的袋状锂二次电池,其特征在于,该负电极接头包括镍板。
6.根据权利要求1的袋状锂二次电池,其特征在于,通过将正电极活性材料层涂覆在正电极集电器的至少一个表面上而形成正电极板。
7.根据权利要求1的袋状锂二次电池,其特征在于,通过将负电极活性材料层涂覆在负电极集电器的至少一个表面上而形成负电极板。
8.根据权利要求1的袋状锂二次电池,其特征在于,该隔板包括聚乙烯膜、聚丙烯膜、或聚乙烯-聚丙烯复合膜。
9.根据权利要求1的袋状锂二次电池,其特征在于,该壳体包括连接到下壳体部分的上壳体部分。
10.根据权利要求9的袋状锂二次电池,其特征在于,相连的上壳体部分和下壳体部分形成六面体形状。
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2003
- 2003-06-24 KR KR1020030041052A patent/KR100544119B1/ko active IP Right Grant
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- 2004-06-09 US US10/863,510 patent/US7427453B2/en active Active
- 2004-06-23 JP JP2004184640A patent/JP4121481B2/ja not_active Expired - Lifetime
- 2004-06-24 CN CNB2004100694625A patent/CN100446333C/zh not_active Expired - Lifetime
- 2004-06-24 CN CN2008101301994A patent/CN101345323B/zh not_active Expired - Lifetime
- 2004-06-24 CN CN200810130198XA patent/CN101355181B/zh not_active Expired - Lifetime
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US7427453B2 (en) | 2008-09-23 |
KR100544119B1 (ko) | 2006-01-23 |
JP2005019404A (ja) | 2005-01-20 |
KR20050000594A (ko) | 2005-01-06 |
JP4121481B2 (ja) | 2008-07-23 |
CN101345323B (zh) | 2010-06-23 |
CN1574443A (zh) | 2005-02-02 |
CN100446333C (zh) | 2008-12-24 |
CN101345323A (zh) | 2009-01-14 |
CN101355181A (zh) | 2009-01-28 |
US20050014036A1 (en) | 2005-01-20 |
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