CN117996340A - 压缩垫以及用于制造具有这种压缩垫的电池单元堆的方法 - Google Patents
压缩垫以及用于制造具有这种压缩垫的电池单元堆的方法 Download PDFInfo
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Abstract
在各种实施方案中提供了一种用于电池单元堆(4)的压缩垫(3),该压缩垫包括:内部空间,在该内部空间中设置有填充材料;围绕该内部空间的表面,其中压缩垫(3)的该表面的至少一部分包括选择性渗透或半渗透分离层。还提供了一种用于制造包括根据本发明的压缩垫(3)的电池单元模组的方法。
Description
技术领域
本发明涉及一种用于电池单元堆(电池单元包)的压缩垫。本发明还涉及一种用于制造电池单元堆的方法,该电池单元堆包括具有选择性渗透或半渗透分离层的压缩垫。
背景技术
电动车辆的行驶里程很大程度上取决于安装在电动车辆中的牵引用电池。如今,由电池单元模组(也称为电池模组)组成的适当尺寸的高压电池用于为现代电动车辆提供动力,电池单元模组中的每个电池单元模组又包含多个电池单元,每个电池单元代表最小的独立能量储存单元。例如,在保时捷Taycan的某些车型中使用的双层高性能电池升级版包括33个电池单元模组,每个电池单元模组包括12个单独的电池单元。因此,牵引用电池包括总共396个电池单元,其中锂离子电池用作电池单元。牵引用电池的系统电压为800伏,并且总容量为93.4kWh。
电池基本上是使用电池模组构建的,多个电池单元并联布置在该电池模组中,其中压缩垫(也称为压缩插入件)布置在每两个电池单元之间。布置在电池单元之间的压缩垫执行另一重要任务,即提供对增加的电池单元厚度(膨胀)的补偿。膨胀是电池单元,特别是锂离子电池单元的体积变化,该体积变化一方面可以在充电和放电期间观察到,并且另一方面是在较慢的时间尺度内由电池单元的老化引起的。膨胀是由电池单元内部的活性层的结构变化引起的,该结构变化由所述电池单元中发生的锂离子的重新排列导致。膨胀在软包电池中特别明显,该软包电池是广泛使用的电池单元设计。如上所述,在电池单元的堆叠方向上将压缩垫放置在电池单元之间,使得所述垫能够通过压缩来平衡电池模组内的电池单元的体积变化。
此外,可压缩垫也可用于在电池单元包中积聚力,所述电池单元包可以借助于该力而被夹紧在壳体(电池壳体或模组壳体)中。为了实现良好的预张紧,电池单元包的外部尺寸通常与壳体的内部尺寸仅略有不同。可高度压缩的纯泡沫垫目前被用作压缩垫。因此,电池单元包在安装期间被过度压缩以暂时减小其尺寸,并且在这种过度压缩的状态下被推入壳体中,这使得插入电池单元堆的过程复杂化,并且因此使得该过程相对复杂。然后,使用特定的插入力进行插入过程,因为当电池单元包被插入时,该电池单元包从内部压靠壳体的内侧,这导致摩擦力,电池单元或压缩垫可能被该摩擦力损坏。
公开文本US2014/141307 A1描述了一种用于电池的典型制造工艺,该电池具有电池壳体和在所述壳体中彼此相邻布置的多个电池单元,其中泡沫压缩垫布置在每两个相邻的电池单元之间,该泡沫压缩垫在组装过程中被压缩并且在组装后膨胀。
在电池的背景下,公开文本GB 1197468 A公开了使用分离器来分离润湿时膨胀的电极。
公开文本WO 2021/233778 A1公开了一种具有多个相邻布置的电池单元的电池,其中散热器布置在每两个相邻的电池单元之间,该散热器由于弹性外壳也用作压缩垫。
基于现有技术中已知的压缩垫,本发明的目的在于提供压缩垫和对应的制造方法,其有助于将电池单元包插入壳体中的过程。
发明内容
该目的通过具有下文所述的特征的用于电池单元堆的压缩垫和用于制造电池单元模组的方法来实现。在从属方案中可以找到另外的优选实施方案。
根据本发明,在各种实施方案中提供了一种用于电池单元堆的压缩垫,并且该压缩垫包括内部空间和围绕该内部空间的表面,在该内部空间中设置有填充材料,其中该压缩垫的表面的至少一部分包括选择性渗透或半渗透分离层,该分离层例如可以包括选择性渗透或半渗透膜。为了简洁起见,下面将只讨论半渗透分离层,然而,也可以总是包括选择性渗透分离层。
本发明利用压缩垫的特定结构实现了基本目的。压缩垫在组装状态下比在后期操作状态下具有更小的体积,而不需要主动向它们施加压力。换句话说,组装状态可以理解为压缩垫的未激活状态,而在操作状态下,根据本发明的压缩垫处于激活状态。在压缩垫处于组装状态的情况下,电池单元堆可以被构造成相对于其在壳体中的安装空间而言尺寸较小,并且因此可以容易地插入电池模组或电池壳体中。
根据本发明,渗透作用用于将根据本发明的压缩垫从组装状态转移到操作状态。为此,根据本发明的压缩垫具有表面,该表面至少部分地包括半渗透分离层,诸如对应的膜。根据本发明的压缩垫也可以被半渗透分离层完全覆盖。鉴于其功能模式,根据本发明的压缩垫也可以被称为渗透性压缩垫。
根据本发明的压缩垫可以安装到电池单元堆中,该电池单元堆安装在合适的壳体中。通过使半渗透分离层与溶剂接触,根据本发明的压缩垫在壳体中被激活或转移到操作状态。半渗透分离层对所述溶剂可以是可渗透的,使得溶剂可以通过所述分离层流入根据本发明的压缩垫的内部,以便平衡被膜分离的相中的一种或多种物质的浓度差或化学势之间的差异以及它们在半渗透分离层内外的不同浓度。因此,根据本发明的压缩垫体积增加,并且从而在电池单元上积聚必要的压力以将它们夹紧在壳体内。
根据本发明的压缩垫的内部空间可以容纳流入的流体体积,为此,例如,它可以包括分布式腔体。当膜被溶剂润湿时,除了分离相的化学势差或浓度差之外,溶剂进入压缩垫的内部空间的初始流动可以由毛细力驱动。一旦溶剂流入内部空间中,渗透压形成,这允许更多的溶剂从外部通过半渗透分离层流入压缩垫的内部空间中。可以在根据本发明的压缩垫的内部空间中另外提供一种物质,该物质被最初流入的溶剂溶解并且产生浓度梯度,该浓度梯度进一步加强溶剂的流入。在这种情况下,膜对这种物质可以是不可渗透的。在本说明书的上下文中,溶剂可以是流体,该流体是被膜分离的相中的至少一个相的一部分,并且可以穿过膜以减小两个相之间的浓度差或化学势差。
压缩垫的表面的包括半渗透分离层的部分尤其可以是压缩垫的不抵靠电池单元的区域,电池单元构成电池单元堆内并在电池单元堆内;诸如,当在横向截面中观察电池单元堆时,例如立方形或垫状压缩垫的上侧和下侧。
此外,在随后的填充过程中,将流体引入电池中之前,在组装期间还可以通过来自周围环境的气体来实现渗透过程以及因此压缩垫的压力积聚。
根据本发明的压缩垫的另外的实施方案,填充材料可以包括在渗透过程后具有弹性的物质,例如塑料,特别是多孔塑料,诸如泡沫聚合物。替代地,填充材料可以包括弹性体,该弹性体可以具有溶剂可以流入其中的穿孔。在渗透过程发生之前,填充材料不必是弹性的,但可以是固体,或者它可以是弹性的,但具有更大的材料硬度。
根据本发明的压缩垫的另外的实施方案,填充材料可以表现出化学势之间的差异和被选择性渗透或半渗透分离层分离的相之间的浓度差异。
根据本发明,还提供了一种用于制造电池单元模组的方法,其中所述方法还可以用于制造所述电池单元模组的更高级实体,即电池。在第一步骤中,该方法包括制备电池单元包,该电池单元包具有电池单元的布置,其中根据前述实施方案中的一个实施方案的渗透性压缩垫布置在每两个电池单元之间。例如,电池单元可以是软包电池的形式。作为下一步骤,该方法包括将电池单元包插入壳体中,其中电池单元包相对于在壳体中为其提供的安装空间而言尺寸较小。然后,该方法包括将流体或气体引入壳体中,使得该流体或气体与压缩垫的半渗透分离层接触,并且通过该半渗透分离层流入压缩垫中以平衡浓度差。流体可以是上述溶剂。
根据本发明的制造方法的另外的实施方案,流体可以是冷却介质。电池单元模组或对应的电池可以是直接冷却的电池单元模组或直接冷却的电池。其特征在于冷却系统,在该冷却系统中,冷却介质直接围绕电池单元流动。冷却介质也直接围绕压缩垫流动。因此,在这样的实施方案中,使用也用作电池模组或电池中的冷却介质的流体。
根据另外的实施方案,压缩垫和/或流体可以包含物质,该物质在压缩垫中的浓度低于在流体中的浓度。在这种情况下,半渗透分离层同时对这种物质可以是不可渗透的。这允许建立浓度梯度,该浓度梯度进一步驱动流体流入根据本发明的压缩垫中。
根据本发明,还提出了使用渗透作用来引起压缩垫的膨胀,该压缩垫布置在壳体内的电池单元堆中,并且/或者同时流体或气体围绕该压缩垫流动。
总体上,本发明在此公开下述方案1、4和7的技术方案,下述方案2-3和5-6为优选技术方案:
方案1.一种用于电池单元堆的压缩垫,包括:
内部空间,填充材料存在于所述内部空间中,
围绕所述内部空间的表面,其中所述压缩垫的所述表面的至少一部分包括选择性渗透或半渗透分离层。
方案2.根据方案1所述的压缩垫,
其中所述填充材料包括在渗透作用过程后具有弹性的物质。
方案3.根据方案1或方案2所述的压缩垫,
其中所述填充材料表现出化学势之间的差异和被选择性渗透或半渗透膜分离的相之间的浓度差异。
方案4.一种用于制造电池单元模组的方法,包括以下步骤:
提供电池单元包,所述电池单元包包括电池单元的布置,其中根据前述方案中任一项所述的压缩垫布置在每两个电池单元之间;
将所述电池单元包插入壳体中,其中所述电池单元包相对于在所述壳体中为电池单元包提供的安装空间而言尺寸较小;
将流体或气体引入所述壳体中,使得所述流体或气体与所述压缩垫的选择性渗透或半渗透分离层接触,并且通过所述选择性渗透或半渗透分离层流入所述压缩垫中以平衡浓度差。
方案5.根据方案4所述的方法,
其中所述流体是冷却介质。
方案6.根据方案4或方案5所述的方法,
其中所述压缩垫和/或所述流体包含物质,所述物质在所述压缩垫中的浓度低于在所述流体中的浓度。
方案7.渗透作用引起压缩垫膨胀的用途,所述压缩垫布置在壳体内的电池单元堆中,并且流体或气体围绕所述压缩垫流动。
不言而喻,上述特征和下面将要解释的特征不仅可以以各自指定的组合使用,而且可以以其他组合或它们自身使用,而不脱离本发明的范围。
附图说明
本发明的其他优点和配置将从说明书和附图中显现。
图1示出了将具有处于组装状态的根据本发明的压缩垫的电池单元堆安装到壳体中。
图2示出了安装有具有处于操作状态的压缩垫的电池单元堆的壳体。
具体实施方式
图1是电池单元堆4在其插入壳体1中之后不久的示意图。在所示的示例中,电池单元堆4包括三个电池单元2,这些电池单元分别由根据本发明的压缩垫3彼此分开。这样的压缩垫3也设置在电池单元堆4的每个端部处。因为压缩垫3处于组装状态,即处于未膨胀状态,所以电池单元堆4尺寸较小,并且可以相对容易地插入壳体1中,而无需任何特殊措施。
图2示出了对应的电池模组或对应的电池操作时的电池单元堆4。此处,压缩垫3已经通过使流体5穿过设置在壳体1中的液体冷却系统流动路径而被激活。流动路径可以在壳体1的内壁与电池单元2和压缩垫3的表面之间形成,从而提供直接冷却的电池单元包4。当流体5流过壳体1时,该流体接触并流过压缩垫3的半渗透分离层,以平衡半渗透分离层内外的浓度差。因此,压缩垫3体积增加,并且从而在电池单元2上积聚必要的压力以将它们夹紧在壳体1内。如图2所示,在具有激活的压缩垫3的电池单元堆4与壳体1的内壁之间不再有任何轴向间隙。
如上所述,可以通过使流体单独穿过电池或电池模组的冷却系统来激活压缩垫。液体冷却介质可以替代地用作流体,使得不需要单独的激活步骤。为此,冷却介质可以包含另外的添加剂,以增强通过半渗透分离层的渗透作用。
Claims (7)
1.一种用于电池单元堆(4)的压缩垫(3),包括:
内部空间,填充材料存在于所述内部空间中,
围绕所述内部空间的表面,其中所述压缩垫(3)的所述表面的至少一部分包括选择性渗透或半渗透分离层。
2.根据权利要求1所述的压缩垫(3),
其中所述填充材料包括在渗透作用过程后具有弹性的物质。
3.根据权利要求1或2所述的压缩垫(3),
其中所述填充材料表现出化学势之间的差异和被选择性渗透或半渗透膜分离的相之间的浓度差异。
4.一种用于制造电池单元模组的方法,包括以下步骤:
提供电池单元包(4),所述电池单元包包括电池单元(2)的布置,其中根据前述权利要求中任一项所述的压缩垫(3)布置在每两个电池单元(2)之间;
将所述电池单元包(4)插入壳体(1)中,其中所述电池单元包(4)相对于在所述壳体(1)中为电池单元包提供的安装空间而言尺寸较小;
将流体或气体(5)引入所述壳体(1)中,使得所述流体或气体与所述压缩垫(3)的选择性渗透或半渗透分离层接触,并且通过所述选择性渗透或半渗透分离层流入所述压缩垫(3)中以平衡浓度差。
5.根据权利要求4所述的方法,
其中所述流体(5)是冷却介质。
6.根据权利要求4或5所述的方法,
其中所述压缩垫(3)和/或所述流体(5)包含物质,所述物质在所述压缩垫(3)中的浓度低于在所述流体(5)中的浓度。
7.渗透作用引起压缩垫膨胀的用途,所述压缩垫布置在壳体内的电池单元堆中,并且流体或气体围绕所述压缩垫流动。
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