CN109844996B - 电池模块和包括该电池模块的电池组和车辆 - Google Patents
电池模块和包括该电池模块的电池组和车辆 Download PDFInfo
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Abstract
根据本发明的实施方式的一种电池模块包括:电池堆组件,该电池堆组件包括第一电池单元和第二电池单元;第一汇流条,该第一汇流条连接到所述电池堆组件并具有第一极性;第二汇流条,该第二汇流条连接到所述电池堆组件并具有与所述第一极性相反的第二极性;短路单元,该短路单元在因所述第一电池单元和所述第二电池单元的体积增大而被施加扩张力时,朝向所述第一汇流条和所述第二汇流条移动,以将所述第一汇流条和所述第二汇流条电连接,由此产生短路;以及盒,该盒用于至少部分地容纳或支承所述第一汇流条、所述第二汇流条和所述短路单元。
Description
技术领域
本公开涉及电池模块和包括该电池模块的电池组和车辆,并且更具体地,涉及通过防止电池模块的过充电而提高稳定性的电池模块和包括该电池模块的电池组和车辆。
本申请要求于2017年7月6日在韩国提交的韩国专利申请No.10-2017-0085993的优先权,该韩国专利申请的公开内容以引用方式并入本文中。
背景技术
近来,对诸如笔记本计算机、摄像机和便携式电话这样的便携式电子产品的需求已急剧增加,并且认真地开发了电动车辆、蓄电池、机器人、卫星等。因此,正在积极研究允许重复充电和放电的高性能二次电池。
目前市售的二次电池包括镍-镉电池、镍-氢电池、镍-锌电池、锂二次电池等。在这些电池当中,锂二次电池因其与镍类二次电池相比几乎没有存储效应并且还具有极低的自放电率和高能量密度而备受关注。
锂二次电池主要分别使用锂类氧化物和含碳材料作为正极活性材料和负极活性材料。锂二次电池包括电极组件和外部构件,在所述电极组件中,设置分别涂覆有正极活性材料和负极活性材料的正极板和负极板,且在正极板和负极板之间插置有隔膜,所述外部构件是电池壳体,在所述电池壳体中,将所述电池组件和电解液一起容纳和密封。
通常,根据外部构件的形状,锂二次电池可以被分为电极组件被包括在金属罐中的罐型二次电池和电极组件被包括在由铝层压片材制成的袋中的袋型二次电池。
近年来,二次电池不仅被广泛用于诸如便携式电子装置这样的小型装置中,而且还被广泛用于诸如车辆和储电装置这样的中型装置和大型装置中。特别地,随着碳能源的日益消耗和对环境的关注日益增加,人们的注意力集中在包括美国、欧洲、日本和韩国的世界各地的混合动力车辆和电动车辆上。混合动力车辆和电动车辆中最重要的组件是为车辆马达提供驱动动力的电池组。由于混合动力车辆或电动车辆能够通过电池组的充电和放电来获得车辆的驱动力,因此燃料效率高于仅使用引擎的车辆的燃料效率,并且能减少或基本上消除污染物。出于这些原因,混合动力车辆和电动车辆被越来越多地使用。另外,混合动力车辆或电动车辆的电池组包括多个二次电池,并且这多个二次电池串联和并联连接,以改进容量和功率。
二次电池具有优异的电特性,但是在诸如过充电、过放电、暴露于高温和电短路这样的异常操作条件下,造成电池的活性材料、电解液等的分解反应而产生热量和气体,由此导致二次电池膨胀的所谓膨胀现象。膨胀现象使分解反应加速,这会造成二次电池由于热失控而***和燃烧。
因此,二次电池包括诸如用于在过充电、过放电或过电流时切断电流的保护电路、用于在温度升高时通过大幅增大电阻来切断电流的正温度系数(PTC)元件、用于在由于气体产生而压力增大时切断电流或排出气体的安全通风口这样的安全***。
特别地,在传统技术中,为了即使发生了膨胀现象也确保电池组的安全,已经研究了在二次电池的体积扩张时由于物理变化而被切断的电连接构件。
然而,即使使用电连接构件,当二次电池扩张超过一定体积时,也难以确定地切断二次电池的电流。
另外,二次电池即使在处于正常操作状态而非异常操作状态时也重复扩张和收缩,因此甚至在正常操作范围内也会切断二次电池的电流,这会使操作可靠性下降。
发明内容
技术问题
本公开被设计用于解决现有技术的问题,因此本公开涉及提供能通过以下方式来防止过充电的电池模块和包括该电池模块的电池组和车辆:利用由于发生过充电情形时电池单元的体积增大而施加的扩张力将具有不同极性的第一汇流条和第二汇流条电连接,由此产生短路,使得形成在这对汇流条中的至少一个中的易断部分(breakingportion)被断开,以停止充电。
本公开的这些和其它目的及优点可以从如下详细描述来理解,并且从本公开的示例性实施方式更完全地显现出来。此外,将容易理解的是,本公开的目的和优点可以通过所附权利要求及其组合中所示的装置来实现。
技术解决方案
在本公开的一方面,提供了一种电池模块,该电池模块包括:电池堆,该电池堆具有第一电池单元和第二电池单元;第一汇流条,该第一汇流条连接到所述电池堆并具有第一极性;第二汇流条,该第二汇流条连接到所述电池堆并具有与所述第一极性相反的第二极性;短路单元,该短路单元被配置为通过接收因所述第一电池单元和所述第二电池单元的体积增大引起的扩张力而朝向所述第一汇流条和所述第二汇流条移动,使得所述第一汇流条和所述第二汇流条电连接而产生短路;以及盒,该盒被配置为至少部分地容纳所述第一汇流条、所述第二汇流条和所述短路单元。
所述短路单元可以包括:弹性构件,该弹性构件具有被支承在所述盒的内侧的一端,并且该弹性构件被配置为通过在背离所述汇流条的方向上被压缩而储存弹性能量;以及短路端子,该短路端子被配置为当所述弹性构件恢复时朝向所述汇流条移动,使得所述第一汇流条和所述第二汇流条电连接。
所述短路端子可以设置在滑杆的一侧端部处并由导电材料制成。
可以在所述滑杆的另一侧端部处设置止动件,并且所述止动件被所述盒卡住并被固定到所述盒,使得所述弹性构件保持被压缩状态,因此所述滑杆保持与所述第一汇流条和所述第二汇流条间隔开的状态。
所述止动件可以通过接收因所述电池单元的膨胀引起的扩张力而释放卡住的状态,使得所述滑杆朝向所述第一汇流条和所述第二汇流条移动。
可以在所述盒中形成有形状与所述短路单元的外观对应的容纳空间,以在所述容纳空间中容纳所述短路单元。
根据弹性构件的恢复状态,可以与所述短路单元的尺寸和形状对应地形成所述容纳空间。
所述第一汇流条和所述第二汇流条中的至少一个可以具有易断部分,所述易断部分在发生短路时断开以阻断短路电流。
此外,在本公开的另一方面,还提供了一种包括所述电池模块的电池组,并且还提供了一种包括根据本公开的实施方式的电池模块的车辆。
有益效果
根据本公开,当发生过充电情形时,因电池单元的体积增大而施加扩张力,使得具有不同极性的第一汇流条和第二汇流条电连接,以产生短路,因此断开形成在这对汇流条中的至少一个中的易断部分,以停止充电,由此防止电池模块的过充电。以这种方式,能够提高电池模块的安全性。
附图说明
附图例示了本公开的优选实施方式,并且与以上公开内容一起用于提供对本公开的技术特征的进一步理解,因此,本公开不被解释为限于附图。
图1是示出根据本公开的实施方式的电池模块的立体图。
图2是示出本公开中采用的电池堆的立体图。
图3是示出本公开中采用的盒和短路单元的分解立体图。
图4是示出根据本公开的实施方式的电池模块的部分平面图,例示了发生膨胀之前的状态。
图5是示出根据本公开的实施方式的电池模块的部分平面图,例示了发生膨胀之后的状态。
图6是示出根据本公开的实施方式的电池模块处采用的汇流条的立体图。
图7是示出根据本公开的实施方式的电池模块处发生短路之前的状态的电路图。
图8是示出根据本公开的实施方式的电池模块处发生短路之后的状态的电路图。
图9是示出根据本公开的实施方式的汇流条由于电池模块处产生的短路而断开的状态的电路图。
具体实施方式
下文中,将参照附图来详细描述本公开的优选实施方式。在进行描述之前,应该理解,在说明书和所附权利要求中使用的术语不应该被理解为限于通用含义和字典含义,而是以使得发明人能够定义适于最佳说明的术语的原理为基础基于与本公开的技术方面对应的含义和概念来解释。因此,本文中提出的描述仅仅是只出于例示目的的优选示例,而不旨在限制本公开的范围,所以应该理解,在不脱离本公开的范围的情况下,可以得到其它等同形式和修改形式。
首先,将参照图1至图3来详细地描述根据本公开的实施方式的电池模块。
图1是示出根据本公开的实施方式的电池模块的立体图,图2是示出本公开中采用的电池堆的立体图,并且图3是示出本公开中采用的盒和短路单元的分解立体图。
参照图1至图3,根据本公开的实施方式的电池模块可以包括电池堆100、一对端板200、盒300、短路单元400和汇流条500。
参照图2,电池堆100包括至少两个电池单元110,并且多个电池单元110被堆叠使得它们的宽表面彼此面对。
电池单元110是袋型电池,并且可以被配置为使得通过将正极板、隔膜和负极板层压至少一次而制备的电极组件被容纳在由袋膜制成的袋壳体中,并且通过热融合来密封上部袋壳体和下部袋壳体的边缘区域。
这里,一对电极引线111、112分别连接到电极组件的正极板和负极板的未涂覆部分并被穿过袋壳体的密封区域抽出。
该对电极引线111、112具有不同的极性,并且该对电极引线111、112可以在相反方向上延伸。电池堆100的电池单元110可以被布置为使得邻近电极引线具有彼此相反的极性。在这种情况下,电池单元110可以彼此串联连接。
如果如上所述电池堆100的电池单元110彼此串联连接,则设置在电池堆100的最外侧的一对电池单元110分别包括在相同方向上延伸并具有不同极性的电极引线111、112。
也就是说,设置在处于电池堆100的一个最外侧处的电池单元110中并朝向盒300延伸的电极引线111与设置在处于电池堆100的另一个最外侧处的电池单元110中并朝向盒300延伸的电极引线112具有不同的极性。
另外,如果电池单元110被进一步设置在处于最外侧的这对电池单元110之间,则为了将电池单元110串联连接,具有不同极性的电极引线111、112可以彼此接触,以形成单个引线集合体113。
电极引线111、112和引线集合体113分别被***并固定在形成在如上所述的盒300中的容纳槽中,稍后将对此进行详细描述。
接下来,参照图1,这对端板200被设置在电池堆100的两侧,以覆盖处于最外侧的电池单元110的宽表面。这对端板200可以通过形成在其周缘区域中的多个联接孔H彼此紧固,以固定和按压电池堆100。
尽管未在图中示出,但是通过应用诸如螺栓组件或螺栓和螺母紧固结构这样的各种已知紧固结构,这对端板200可以通过联接孔H紧固。
以这种方式,即使在电池单元110处发生膨胀,通过应用这对端板200,电池堆100的运动也被限制在与堆叠方向平行的方向上。因此,即使在电池单元110处发生膨胀,电池单元110的体积也几乎没有沿着电池单元110的堆叠方向膨胀,并且电池单元110主要沿着与堆叠方向垂直的方向扩张。
接下来,参照图3,在图3中,盒300在设置在电池堆100处的电极引线111、112和引线集合体113延伸的方向上位于电池堆100的一侧,使得盒300的一侧被固定到一个端板200而盒300的另一侧被固定到另一个端板200。可以使用螺栓B固定盒300和端板200。
盒300具有与稍后说明的短路单元400对应的形状的容纳空间310,并且还具有支承部分320,支承部分320被形成为使得短路单元400的止动件440能被卡住和固定。另外,盒300包括分别***和固定有汇流条510、520、引线集合体113和电极引线111、112的第一容纳槽330、第二容纳槽340和第三容纳槽350。
接下来,将参照图4和图5连同图3一起来详细地描述本公开中采用的短路单元400。
图4是示出根据本公开的实施方式的电池模块的部分平面图,例示了发生膨胀之前的状态,并且图5是示出根据本公开的实施方式的电池模块的部分平面图,例示了发生膨胀之后的状态。
参照图3至图5,短路单元400是通过使用电池单元110的因膨胀引起的扩张力将第一汇流条510和第二汇流条520电连接从而产生短路的组件。
短路单元400可以包括滑杆410、弹性构件420、短路端子430和一对止动件440。
滑杆410被设置在盒300的容纳空间310中,并且在由于膨胀而向短路单元400施加扩张力时,从电池单元110朝向汇流条510、520移动。
滑杆410可以在当诸如弹簧这样的弹性构件420被压缩并随后恢复时产生的力的作用下朝向汇流条510、520移动。为了在滑杆410移动时将这对汇流条510、520电连接,短路单元400包括形成在滑杆410的一侧端部并由导电材料制成的短路端子430。
另外,短路单元400包括形成在滑杆410的一个侧端部处的止动件440,使得弹性构件420能保持压缩状态。止动件440例如具有钩形并且可以被盒300的支承部分320卡住。
如上所述,在短路单元400中,在不产生膨胀的情形下,止动件440保持被支承部分320卡住,因此弹性构件420在压缩状态下储存弹性能量。
此外,在短路单元400中,如果在电池单元110中发生膨胀以将电池单元110的扩张力施加到止动件440,则止动件440和支承部分320之间的卡住和固定状态被释放,并且,由于弹性构件420的恢复力,滑杆410朝向汇流条510、520移动,以将具有不同极性的这对汇流条510、520彼此电连接,由此产生短路。
接下来,将参照图6连同图3至图5一起来详细地描述本公开采用的汇流条500的构造。
图6是示出根据本公开的实施方式的电池模块采用的汇流条的立体图。
参照图6,本公开中采用的汇流条510、520被容纳并固定在形成在盒300中的第一容纳槽330中,并且它们的一端与处于电池堆100最外侧的电池单元110的在盒300的第三容纳槽350内部的电极引线111、112接触。
也就是说,这对汇流条510、520可以分别电连接到电池堆100以具有第一极性和与第一极性相反的第二极性,并且用作电池模块的外部端子。因此,这对汇流条510、520可以分别连接到由电能驱动以供应或接收充电电流的充电装置或电子装置这样的外部装置的正极和负极。
此外,根据本公开的这对汇流条510、520中的至少一个可以包括易断部分511、521,以在由于短路而产生过电流时快速断开并由此完全阻断电流流动。
如图6中所示,易断部分511、521可以被成形为通过在其中形成凹口而具有比周缘区域的截面面积小的截面面积。然而,除了凹口之外,还可以例如通过应用熔点比周缘区域的熔点低的金属来制备易断部分511、521,而没有任何限制,只要它们可以用作熔断器即可。
接下来,将参照图7至图9来描述根据本公开的实施方式的由于电池模块处的过充电等而发生膨胀现象之前和之后的电路配置。
图7是示出根据本公开的实施方式的电池模块处发生短路之前的状态的电路图,
图8是示出根据本公开的实施方式的电池模块处发生短路之后的状态的电路图,并且
图9是示出根据本公开的实施方式的汇流条由于电池模块处产生的短路而断开的状态的电路图。
首先,参照图7,如果在根据本公开的电池模块处没有发生由于过充电等而导致的膨胀,则电池单元110的体积没有增加,因此在电路上没有产生短路。
然而,如图8中所示,如果在根据本公开的电池模块处发生由于过充电引起的膨胀,则短路单元400可以接收电池单元110的扩张力而将第一汇流条510和第二汇流条520电连接,使得在电路上产生短路,因此异常高的电流会在电路上流动。
此后,形成在至少一个汇流条中的易断部分511、521由于高电流引起的发热而断开,由此阻断从外部电压源供应到电池模块的电流流动或从电池模块供应到外部电子装置的电流流动。以这种方式,能够预先防止电池模块***或燃烧。
此外,根据本公开的电池组包括如上所述的至少一个电池模块。另外,除了根据本公开的实施方式的电池模块之外,电池组还可以包括用于容纳电池模块的壳体以及诸如电池管理***(BMS)、电流传感器和熔丝这样的用于控制电池模块的充电/放电的各种装置。
特别地,根据本公开的实施方式的电池组可以包括设置在电池组处的每个电池模块处的第一汇流条、第二汇流条、短路单元和盒,以通过在电池单元异常扩张时使第一汇流条断裂来切断从外部电压源供应的电力,从而防止每个电池模块被过充电。
根据本公开的电池模块可以被应用于诸如电动车辆和混合动力车辆这样的车辆。也就是说,根据本公开的车辆可以包括本公开的电池模块。
已经详细地描述了本公开。然而,应该理解,详细说明和具体示例尽管示出了本公开的优选实施方式但是仅以例示的方式给出,这是因为从该详细说明本领域技术人员将清楚在本公开的范围内的各种改变和修改。
Claims (7)
1.一种电池模块,该电池模块包括:
电池堆,该电池堆具有第一电池单元和第二电池单元;
第一汇流条,该第一汇流条连接到所述电池堆并具有第一极性;
第二汇流条,该第二汇流条连接到所述电池堆并具有与所述第一极性相反的第二极性;
短路单元,该短路单元被配置为通过接收因所述第一电池单元和所述第二电池单元的体积增大引起的扩张力而朝向所述第一汇流条和所述第二汇流条移动,使得所述第一汇流条和所述第二汇流条电连接而产生短路;以及
盒,该盒被配置为至少部分地容纳所述第一汇流条、所述第二汇流条和所述短路单元,
其中,所述短路单元包括:
弹性构件,该弹性构件具有被支承在所述盒的内侧的一端,并且该弹性构件被配置为通过在背离所述第一汇流条和所述第二汇流条的方向上被压缩而储存弹性能量;以及
短路端子,该短路端子被配置为当所述弹性构件恢复时朝向所述汇流条移动,使得所述第一汇流条和所述第二汇流条电连接,
其中,所述短路端子设置在滑杆的一侧端部处并由导电材料制成,
其中,在所述滑杆的另一侧端部处设置止动件,并且所述止动件被所述盒卡住并被固定到所述盒,使得所述弹性构件保持被压缩状态,因此所述滑杆保持与所述第一汇流条和所述第二汇流条间隔开的状态。
2.根据权利要求1所述的电池模块,其中,所述止动件通过接收因所述电池单元的膨胀引起的所述扩张力而释放卡住的状态,使得所述滑杆朝向所述第一汇流条和所述第二汇流条移动。
3.根据权利要求1所述的电池模块,其中,在所述盒中形成有形状与所述短路单元的外观对应的容纳空间,以在所述容纳空间中容纳所述短路单元。
4.根据权利要求3所述的电池模块,其中,根据弹性构件的恢复状态,与所述短路单元的尺寸和形状对应地形成所述容纳空间。
5.根据权利要求1所述的电池模块,其中,所述第一汇流条和所述第二汇流条中的至少一个具有易断部分,所述易断部分在发生短路时断开以阻断短路电流。
6.一种电池组,该电池组包括根据权利要求1至5中任一项中所述的电池模块。
7.一种车辆,该车辆包括根据权利要求1至5中任一项中所述的电池模块。
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CN111477828A (zh) * | 2020-04-30 | 2020-07-31 | 昆山宝创新能源科技有限公司 | 电池模块及具有其的电池模组和汽车 |
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CN113097665A (zh) * | 2021-03-30 | 2021-07-09 | 东莞新能安科技有限公司 | 电池模组及用电装置 |
CN114374060B (zh) * | 2022-03-22 | 2022-06-14 | 深圳市青之鸟科技有限公司 | 一种应用于植保无人机的电池组 |
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KR20190005403A (ko) | 2019-01-16 |
US11046206B2 (en) | 2021-06-29 |
KR102201342B1 (ko) | 2021-01-08 |
EP3512008A4 (en) | 2019-10-02 |
EP3512008B1 (en) | 2023-01-11 |
EP3512008A1 (en) | 2019-07-17 |
JP2019530186A (ja) | 2019-10-17 |
CN109844996A (zh) | 2019-06-04 |
JP6780100B2 (ja) | 2020-11-04 |
US20190366875A1 (en) | 2019-12-05 |
WO2019009625A1 (ko) | 2019-01-10 |
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