CN101952995B - 电池组内的电池芯端子电性连接的方法 - Google Patents
电池组内的电池芯端子电性连接的方法 Download PDFInfo
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Abstract
一个经济且可靠互连大量小型化电池芯的电池组。一个导电板包含复数组突出于导电板的平坦表面、用以连接复数个电池芯的电气端子的舌片。每一组舌片随着相对应电池芯放置且施予一弹力,因此导电板机械固定和电气连接于电池芯上。
Description
相关前案
本申请主张2008年2月15日在美国申请Provisional Application No.61/029,300的优先权。
技术领域
本发明是多电池芯电池系统。
背景技术
电池组已应用在汽车和工业应用上许多年。传统上,这些电池组使用相对少量的大电池芯,通常为铅酸型的电池芯。一个使用少量大电池芯的电池组设计有几个缺点:首先,如果其中一个电池芯失效,会使整体能量容量的损失显著的百分比;例如,一个用11个电池芯的电池组,单一电池芯失效会导致总容量9%的损失。其次,这种电池组的发热冷却效率不佳:一个电池芯的冷却效率是正比于电池芯的表面积对体积比,较大的电池芯比起较小的电池芯有较小的表面积对体积比。当温度提高,电池芯会退化。例如,当锂电池处于60℃的温度会在3个月内丧失20%可用的充电量,相比之下,当温度维持在25℃时,它们会用3年才失去相同百分比的充电量。因此,电池组的设计中,散热是一个重要的因素。
最近,在以前受限用于如笔记型电脑和电动工具等相对低功耗(也因此,电池芯数量少)应用领域的高密度、小尺寸的电池芯,已经被建议用在需要大量电池芯的汽车和工业应用的电池组。不幸的是,这些电池组往往非常昂贵,部分原因是大量的包装元件和用传统互连技术互连大量电池芯210(例如,导线104耦合各电池芯端子106和一个金属板,如图1A所示,或将一金属片110焊接到电池芯端子106,如图1B所示)的复杂性。此外,传统的电池芯互连(焊接线或片)容易因电池芯于运作时轻微脱位(例如由于移动车辆中振动)而失效。
附图说明
本发明藉由下列实施例及图式中所附的图而说明,但不能以此成为限定,附图中相似的参考数字用来指示相似的元件,其中:
图1A和1B图示了复数个电池芯端子的电性连接的传统方法;
图2图示了使用大量小型电池芯的电池组的一个实施例;
图3图示了模组内电池芯的实际布局的一个实施例;
图4图示了复数个模组所组成电池组的布局的一个实施例;
图5A和图5B图示了固定复数个电池芯于一个模组中的框架的一个实施例;
图6A和6B图示了电性连接复数个电池芯阳极端子的一个阳极板的实施例;
图7A和7B图示了电性连接复数电池芯阴极端子的一个阴极板的实施例;
图7C图示了一个模组中,阴极板上的电流方向;
图8A图示了相邻区域间电性连接的一个实施例;
图8B-8C图示了在每一个模组前方和后方,阳极板和阴极板的布局;
图9A-9D表示欲用于电动车中的电池组的一组代表性的设计参数。
具体实施方式
经济且可靠地互连大量的小尺寸电池芯的一个低零件数量电池组,揭示于数个实施例中。
图2是电池使用大量小型化电池芯的电池组的一个实施例。在此实施例中,电池芯210群组于一些区块202中;区块接着群组为复数个模组204。如图2所示的例子每一个电池组包含9个模组;每一个模组包含10个区块;而每一个区块包含62个电池芯。因此,一个电池组内总共有5580个电池芯。每个电池芯210有一个正和一个负端子,分别称为阴极206和阳极208。在此实施例中,每一个区块的电池芯以并联方式电性连接,即阴极连接在一起,而阳极连接在一起。每个模组中的区块则以串联方式连接,即第一区块的阴极连接到第二区块的阳极,第二区块的阴极连连到第三区块的阳极等等,依此类推。此外,模组之间也以串联方式连接。电池组的总电压为位于最后一个模组的最后一个区块的阴极(图2,9号模组,10号区块,标记为的′V+′)相对于第一个模组的第一个区块的阳极的电压。(图2,标记为′V-′)。因此,电池组的总体电压等于每一个区块电位乘上电池组的区块数量。
图9A-9D表示使用标准18650型锂电池,欲用于电动车的电池组的一组代表性设计参数。图9A的表格总结出所需电池容量和估计的电池组的全部寿命。图9B,标记′电池组规格′,表示电池组的尺寸和电气特色。图9C,标记′电池组设计′,表示根据图9B表的资料,所得出一个电池组中,电池芯、模组和区块的数目。图9D表示一电池组估计成本的计算。
图3表示每一模组304内电池芯的实际布局的一个实施例。在这个例子中,电池芯210为一个圆形横向剖面部分的圆柱形。如图3所示,电池芯被紧凑排列在一个蜂窝阵列中。在可替代的实施例中,圆柱体电池芯可能有其他形状的断面,如三角形、正方形、长方形或六角形,而这些电池芯可能被安排在其他类型的阵列中,例如一个正方形或长方形阵列,或在不规则阵列中。
对于每一区块202,有两个圆柱汇流排302,如图3中的深灰色圆形。此汇流排是由导电材质如铝所制成。此汇流排电性连接一个区块的阴极与下一个区块的阳极,提供一个低阻抗路径让电流在相邻区块间流动。此汇流排也提供机械支撑而将模组固定在一起,且避免模组外壳上的压力被转移到电池芯。
图4表示一个电池组布局的实施例。在这个例子中,电池组包含了9个模组410。一个实施例是,每一个模组朝向同一垂直面,例如,模组410的前方对应于图3中模组304的前方。一个共同的冷却系统402,甚至可用来冷却每一个电池芯。一个电池管理系统404提供电池运作的容错、自我学习,和自我修复的控制。电池组,包括冷却系统402和电池管理系统404,封闭于一个外壳406中。
一个实施例是,每个模组的电池芯由一绝缘材料,如塑料制成的框架502固定在一起。该框架的材料选择是为了机械强度,以及为了其热属性,如它的承受温度范围和热传导性。该框架有复数个圆柱孔504,供电池芯210插入,如图5A和5B。在这个例子中,每个孔有一个圆形横向剖面部分,其直径略大于电池芯的横向剖面部份。一个实施例是,三个可变形塑料梁柱506被附加或与每一个孔的内墙一体成形,并随着孔的长度延伸。当一个电池芯210受压进入孔内,梁柱506被轻微地压缩,因而运用柔和的压力施于电池芯侧边以维持电池芯在适当的位置。较通常的说法是,任何能固定电池芯于孔内的形式都可被使用,包括与电池芯墙面或突出部分摩擦接触。该复数个孔504依一个预期的形式排列,在此例中为一个紧凑的蜂窝形式。如图5A所示,每个可变形梁柱506被安排在围绕该孔的塑料墙的最薄的一个位置508。当电池芯受压进入孔内,薄的塑料墙提供一些灵活性。汇流排302由相同的框架被维持在适当地方。电池芯是有方向性的,导致所有阴极皆面向后方。
用一个称为阳极板的导电板将每一个区块内的电池芯的阳极连接起来,图6A和6B表示一个阳极板602的实施例,在这个例子中,阳极板是由厚度约1毫米的铝制成。电池芯的阳极端604被机械固定并由复数个突出于阳极板的一侧的舌片对606和608电气接触阳极板602。在一在实施例中,每一对的两个舌片606和608分处于一个代表电池芯横向剖面部份的周围614的对面位置,如图6A的虚线圆形所示。每个舌片的形成,例如,一槽612经由在导电板上沿周围局部切割的几何形状(例如,一个半圈),如图6A所示的实线图。该槽612可使用激光切割、冲压、压制或其他切割手段。导电板上的该区域的部份与其余部分隔开,使切割后可折迭成一弹簧。在这个例子中,第一个舌片606,在此当成为停止舌片,折迭而垂直于板上,第二个舌片608,在此当成为压迫舌片,向后折迭(例如,约180度,虽然不同的弯曲角度都可能被使用),如图6B所示。由于电池芯阳极端被安排在两个舌片之间,其压迫舌片608施予弹力于电池芯的一侧,推动电池芯抵住停止舌片606,从而电池芯牢牢固定在适当位置,将阳极板602固定于电池芯210。在这个例子中,一个电池芯的阳极端子604和阳极板602之间的电性连接是由舌片和电池芯的一侧接触实际接触,和阳极板的平坦表面和电池芯的底部之间的实际接触所造成。(请注意,在这个例子中,阳极终端包括整个电池芯侧面和底部。)。进一步的实施例,一组超过两个的舌片可以用来固定每一电池芯的阳极端于阳极板。这些舌片还可以折迭成不同形状的弹簧。这些舌片也可以另行制作,再附着在阳极板。
参考图6A,复数个周围614,如虚线轮廓且周围分别设置一组舌片,被安排为跟着固定电池芯的框架502内的孔的形式排列,使阳极板602可快速地扣住被框架固定的电池芯阳极板。
上述电性连接电池组中复数个电池芯的阳极的方法比起传统的方法至少有两个优点,如图1所示。首先,经由扣住阳极板于复数个被以框架固定在一起的电池芯的阳极端上,容易实施其连接,无须焊接。第二,舌片606和608的弹簧结构可以允许各电池芯相对位置有较宽松的容许量。因此,连接够坚固足以抵抗由运作条件,如行驶中车辆的振动造成电池芯间轻微的相对运动。
图7A及7B说明了一个阴极板702电性连接复数个电池芯的阴极端子704的实施例。在这个例子中,阴极板是由铝制成,而且非常薄。复数个椭圆形舌片706经由激光、冲压、压制或其他切割手段切割复数个槽708于阴极板702内所形成,如图7A所示。舌片706被安排为跟着固定电池芯的框架502内的孔504的形式排列。由于阴极板702放在由框架固定电池芯阴极端的顶部,舌片706轻微向下弯曲使其接触到电池芯阴极端子704,如图7B所示。该舌片706接着使用超音波金属压焊或其他焊接方式焊接于电池芯的阴极终端。图7C表示阴极板上电流的方向。
图8A表示一个电气连接相邻区块的实施例。一个区块的阴极板702经由和固定电池芯的同一个框架所固定的传导汇流排302电性连接到下一个区块的阳极板602,如上所述。图8B和8C分别说明在每一模组的前方和后方的阳极板和阴极板的布局。
当本发明以特定实施例作为参考来描述,将可作为各种修改和变化可以做出而并未偏离本发明更广泛的精神和范围的证明。因此,说明书和图示将被视为一种说明而非限制意义。
Claims (4)
1.一种电性连接复数电池芯的复数端子的装置,其特征在于,它包括:
一个有至少一平坦表面的导电板;
复数组由该导电板的该平坦表面突出、且电性接触该导电板的该平坦表面的导电舌片对,每一组前述舌片对分别被设置在一个呈现一电池芯横截面的周缘,并且包括一个接触一个电池芯的导电表面的第一舌片、和一个迫使该电池芯迫紧该第一个舌片的第二舌片。
2.如权利要求1所述的装置,其特征在于,其中前述复数组导电舌片对是与该导电板一体成型。
3.如权利要求2所述的装置,其特征在于,其中前述每一舌片是经由在该导电板上沿一几何形状的一部分周缘切割一槽,并折迭该板由该切割而与该导电板剩余部分部份分离的一区域所形成。
4.一种电池系统,其特征在于,包括;
复数个电池芯;
一个有至少一个平坦表面的导电板;
复数组由该平坦表面突出的舌片对,每一组舌片对被设置在一个各别电池芯处,且施一弹力至该各别电池芯,从而机械固定及电性连接该导电板至该电池芯;
其中前述复数组舌片对是与该导电板一体成型;
其中,前述每一舌片对包括一个用以导接该电池芯的第一舌片、及一个用以迫使电池芯迫紧该第一个舌片的第二舌片。
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