CN100411227C - 用于铅蓄电池的隔板 - Google Patents

用于铅蓄电池的隔板 Download PDF

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CN100411227C
CN100411227C CNB2004800259665A CN200480025966A CN100411227C CN 100411227 C CN100411227 C CN 100411227C CN B2004800259665 A CNB2004800259665 A CN B2004800259665A CN 200480025966 A CN200480025966 A CN 200480025966A CN 100411227 C CN100411227 C CN 100411227C
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W·伯恩施代特
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Abstract

本发明涉及一种由弹性塑料制成并适合在铅蓄电池内使用的隔板，所述隔板由具有一内部区域和两个边缘区域的片状材料构成，所述片状材料至少在一侧具有沿纵向延伸的肋条，在内部区域内的肋条具有比在边缘区域内的肋条的间距大的间距，其特征在于，在边缘区域内与内部区域相邻的至少头三根肋条具有从片状材料上突出的基本上为三角形的横截面，其中三角形的底边在片状材料上，三角形的一个侧边朝向内部区域布置，另一个侧边朝向边缘布置，朝向内部区域布置的侧边比朝向边缘布置的侧边长。本发明还涉及一种包含这种类型的隔板的铅蓄电池。

Description

用于铅蓄电池的隔板
技术领域
本发明涉及一种由弹性塑料制成并适合在铅蓄电池内使用的隔板，所述隔板由具有内部区域和两个边缘区域的片状材料构成，在至少一侧具有沿纵向延伸的肋条，其中内部区域内的肋条具有比在边缘区域内的肋条的间距大的间距；本发明还涉及一种包含这种隔板的铅蓄电池。
背景技术
目前在铅蓄电池内使用的隔板是由片状材料的微孔膜，这种膜能够防止极性相反的相邻电极板之间短路以及片状材料脱落，但由于它们的多孔结构允许在电解液中存在离子电流。从例如US 3 351 495、US 4 927 722、US 5 776 630和WO 01/13 442中可以知道这种类型的隔板。这种隔板通常在至少一侧设置用于防止片状材料与阳极板直接接触的纵向肋条。这些肋条还使隔板沿纵向具有一定的刚度。如US 5 679 479和US 5 789 103中所述，这种类型的纵向肋条也可由多个形成交替的凸脊和沟槽的肋条结构的单独的压制凸纹
Figure C20048002596600031
构成。
隔板通常这样来制成，即将热塑性塑料挤出成膜，然后将所述膜轧制成具有规定肋条的片状材料，此后提取出孔隙形成物-例如矿物油，然后将这样形成的片状材料卷成卷。以后将该片状材料从卷中拉出并切割成希望宽度的带。将这些带切割成希望的长度，然后将其折叠覆盖在阳极板或阴极板上以形成包套，包套的两个边缘区域可以通过例如熔焊、压焊或其它已知的方法连接起来。然后将电极板组装成用于蓄电池单元的组，其中隔板包套中的电极板与没有包套的极性相反的电极板交替设置。通常，只将一种极性的电极板放置在隔板包套内；但是，在特殊情况下，两种极性的电极板都可以放置在隔板包套内。现在，在一个组内将电极板对齐，然后将其相互连接。对电极板进行对齐可能会导致单个电极板被或多或少地移入隔板包套的一个或另一个边缘区域。由于制造工艺的原因，电极板通常带有尖端或锐利的棱边，这种移动可导致电极板的尖端或棱边刺穿片状材料，由此可导致与相邻的电极短路。如EP 0 994 518 A1中示例所述，当使用包括由例如混合有实际的活性材料的延展金属制成的拉伸栅格的电极板时，尤其如此。在这种情况下，延展金属不是精确地在栅格节点处切断，从而个别金属线从电极板突出出来，在电极板对齐时容易弯曲并刺穿隔板的片状材料。
为了至少减小被电极板的尖端、棱边或金属线刺穿的危险，已经提出将边缘区域设计成具有布置在多个形状相同的肋条之间的多个平行的沟槽(EP 0 899 801、JP 2000-182593)，以及将沟槽之间的肋条设计得较宽并具有平的表面(WO 00/63983)。然而，已经发现在不利的情况下个别隔板包套在电极板对齐的过程中仍有可能被刺穿，从而存在短路的危险。
发明内容
因此，本发明的目的是进一步改善后一种类型的隔板，以便进一步降低电极板刺穿隔板的片状材料的危险，并提供包含有这种隔板的铅蓄电池。
可以通过由弹性塑料制成并适合在铅蓄电池内使用的隔板实现这一目的，所述隔板由具有内部区域和两个边缘区域的片状材料构成，所述片状材料在至少一侧具有沿纵向延伸的肋条，其中内部区域内的肋条具有比边缘区域内的肋条的间距宽的间距，其中边缘区域内的与内部区域相邻的至少头三根肋条具有从片状材料上突出的基本为三角形的横截面，其中三角形的底边在片状材料上，三角形的一个侧边朝向内部区域布置，而另一个侧边朝向边缘布置，朝向内部区域布置的侧边比朝向边缘布置的侧边长。
朝向内部区域布置的比朝向边缘布置的侧边长的侧边使得在对齐时到达所述朝向内部区域布置的侧边的电极材料从片状材料上移开，因此可以有效地防止刺穿片状材料。
已经证明如果朝向内部区域的侧边的长度是朝向外周的侧边的长度的1.5至15倍、优选2至6倍、最优选2至4倍时尤其有利。通过两侧边的长度比可以特别简单地根据电极板的机械特性确保使电极板的棱边偏转离开片状材料。本领域技术人员可以通过简单的实验确定对于给定的电极板尤其有利的长度比。
还已经证明，朝向内部区域布置的侧边与底边的夹角为5°至40°是有利的。对于目前所使用的电极板，已经证明朝向内部区域布置的侧边和底边之间的角度为8°至30°时最令人满意。
已经证明片状材料的厚度在0.05至0.35mm的范围、尤其在0.08至0.25mm的范围时最令人满意。很显然，该厚度是在相邻肋条之间测量的。
为了增加边缘区域的肋条的稳定性，已经证明如果朝向内部区域布置的侧边与朝向边缘布置的侧边之间的夹角为75°至115°时是适宜的。在很多情况下，角度在80°至100°之间是最佳的。
尤其有利的是，边缘区域内的所有肋条具有相同的横截面。
在常规情况下，在边缘区域内每厘米设置有3至30根肋条，肋条的上棱边与片状材料的距离优选为0.1至0.8mm。
本发明的内容还包括一种铅蓄电池，该蓄电池包含多个彼此平行设置的电极，其中相邻电极具有相反的极性，至少将具有一种极性的电极分别装在本发明的折叠成包套并在边缘区域的边缘处连接起来的隔板内。
附图说明
下面将参照附图详细说明本发明。在附图中：
图1示出本发明的隔板的俯视图；
图2是图1的AA区域的剖视图。
具体实施方式
图1的隔板具有内部区域I和分别位于内部区域I的右侧和左侧的右侧边缘区域RR和左侧边缘区域LR，在片状材料1上，肋条2布置在内部区域内，肋条3布置在两个边缘区域RR和LR内。内部区域中的肋条2之间的间距比边缘区域中的肋条3之间的间距大。
通常通过例如挤出、接下来进行轧制开提取出形成孔隙的矿物油作为连续材料制成这种类型的隔板，然后将其切割成一定长度。然后将每个已被切割成一定长度的隔板垂直于肋条围绕电极板折叠并迭合成包套，图中示出的肋条在正电极板的情况下彼此相对，在负电极板的情况下远离电极板。为了形成顶部开口的包套，将隔板相对的部分的左侧边缘和右侧边缘相互连接。
图1中放大的局部AA示出最靠近边缘的内部区域的肋条2。肋条2后面是边缘区域的多个肋条3，每个肋条3具有基本上为三角形的横截面，该三角形具有位于片状材料1上的底边(未示出)和两个侧边4和5，其中朝向内部区域布置的侧边4比朝向边缘布置的侧边5长。

Claims (8)

1. 一种由弹性塑料制成并适合在铅蓄电池内使用的隔板，所述隔板由具有一内部区域和两个边缘区域的片状材料构成，所述片状材料至少在一侧具有沿纵向延伸的肋条，内部区域内的肋条具有比边缘区域内的肋条的间距大的间距，其特征在于，在边缘区域内与内部区域相邻的至少头三根肋条具有从片状材料上突出的基本上为三角形的横截面，其中三角形的底边在片状材料上，三角形的一个侧边朝向内部区域布置，另一个侧边朝向边缘布置，朝向内部区域布置的侧边比朝向边缘布置的侧边长。
2. 根据权利要求1的隔板，其特征在于，三角形的朝向内部区域布置的侧边的长度是朝向边缘布置的侧边的长度的1.5至15倍。
3. 根据权利要求1或2的隔板，其特征在于，朝向内部区域布置的侧边与底边的夹角为5°至40°。
4. 根据权利要求1或2的隔板，其特征在于，朝向内部区域布置的侧边与朝向边缘布置的侧边的夹角为75°至115°。
5. 根据权利要求1或2的隔板，其特征在于，片状材料的厚度为0.05至0.35mm。
6. 根据权利要求1或2的隔板，其特征在于，边缘区域内的所有肋条具有相同的横截面。
7. 根据权利要求1或2的隔板，其特征在于，在边缘区域内每厘米设置有3至30根肋条。
8. 一种铅蓄电池，该铅蓄电池包含多个彼此平行设置的电极，其中相邻电极具有相反的极性，至少一种极性的电极分别装入根据权利要求1至7中的任一项的折叠成包套并在边缘区域的边缘处连接起来的隔板内。
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ATE346385T1 (de) 2006-12-15
KR20060066085A (ko) 2006-06-15
KR101009272B1 (ko) 2011-01-18
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ES2277267T3 (es) 2007-07-01
JP4589322B2 (ja) 2010-12-01
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US7425387B2 (en) 2008-09-16
DE502004002121D1 (de) 2007-01-04

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