CN101315990A - 一种电池组 - Google Patents
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Abstract
一种电池组包括多个单体电池,所述单体电池包括电池外壳、电芯和电极端子,所述电芯包含于电池外壳中,电芯包括正极极片、负极极片以及位于正极极片和负极极片之间的隔膜,所述电极端子包括正极端子和负极端子,正极端子与正极极片电相连,负极端子与负极极片电相连,单体电池之间通过电极端子串联或并联连接,其中,所述电极端子为片状体,电极端子之间的连接关系为贴合连接。本发明的电池组的内阻较小,连接可靠。
Description
技术领域
本发明是关于一种电池组。
背景技术
随着人们环保意识的提高,电动汽车或混合动力车取代现行的燃油车将是未来的一个发展方向。作为电动汽车的核心动力能源,动力电池组的重要性显得尤为突出,通过串连或并联多个单体电池可形成动力电池组。
CN 1767245A公开了一种电池组件,该电池组件包括布置在外壳中的多个单元电池1。每个单元电池包括从其中伸出的正极端子2和负极端子3,以及连接相邻布置的层叠单元电池的正极端子2和负极端子3的连接件20。连接件还包括固定件21,在正极端子2和负极端子3上形成有外螺纹,在固定件21上形成有内螺纹,通过紧固固定件21而将连接件固定在正极端子2和负极端子3上。在上述电池组件中,正极端子和/或负极端子与连接件的固定件为螺纹连接,接触内阻大,如果它们之间出现了松动,则接触内阻会更大,因此电池组件的内阻较大;此外由于每个单体电池都需要具有外螺纹的正负极端子作为导电元件和用于串联的连接片,因此使得电池组的重量和体积较大。
发明内容
本发明的目的是为了克服现有的电池组内阻较大的缺点,提供一种内阻较小的电池组。
本发明提供了一种电池组,该电池组包括多个单体电池,所述单体电池包括电池外壳、电芯和电极端子,所述电芯包含于电池外壳中,电芯包括正极极片、负极极片以及位于正极极片和负极极片之间的隔膜,所述电极端子包括正极端子和负极端子,正极端子与正极极片电相连,负极端子与负极极片电相连,单体电池之间通过电极端子串联或并联连接,其中,所述电极端子为片状体,电极端子之间的连接关系为贴合连接。
按照本发明提供的电池组,单体电池的电极端子即正极端子和负极端子为片状体,通过将单体电池的电极端子贴合而将多个单体电池电连接在一起,单体电池之间几乎不存在接触内阻,而且贴合后的电极端子不可能松动,因此,与现有的单体电池之间采用螺纹连接的电池组相比,本发明的电池组的内阻较小,连接可靠。
此外,本发明的电池组采用片状体作为电极端子,不需要另加连接件,而是直接将电极端子贴合,因此,可以减小电池组的重量和体积。
附图说明
图1为现有技术的电池组的示意图;
图2为本发明的电池组的示意图;
图3为本发明的电池组的侧面剖视图;
图4为本发明的电池组的单体电池的剖视图;
图5和图6为本发明的电池组的单体电池的盖板与电极端子之间通过密封件密封的示意图。
具体实施方式
下面结合附图对本发明提供的电池组进行更详细的说明。
如图2、3和4所示,本发明提供的电池组包括多个单体电池1,所述单体电池1包括电池外壳4、电芯和电极端子,所述电芯包含于电池外壳4中,电芯包括正极极片5、负极极片6以及位于正极极片5和负极极片6之间的隔膜13,所述电极端子包括正极端子2和负极端子3,正极端子2与正极极片5电相连,负极端子3与负极极片6电相连,单体电池之间通过电极端子串联或并联连接,其中,所述电极端子为片状体,电极端子之间的连接关系为贴合连接。
所述单体电池之间可以为串联或并联的连接关系,可以通过以不同的方式通过连接单体电池的电极端子来实现多个单体电池之间的串联或并联。如图2所示,单体电池之间为串联,一个单体电池的一个电极端子与相邻的一个单体电池的极性相反的电极端子连接,并且另一个电极端子与另一个相邻的单体电池的极性相反的电极端子连接。单体电池进行串联的方式包括但不限于如下方式:位于一端的单体电池的负极端子3与相邻的单体电池的正极端子2连接,或者位于一端的单体电池的正极端子2与相邻的单体电池的负极端子连接,依次类推,两个相邻的单体电池的极性相反的一对电极端子焊接,从而得到的电池组的两端的两个单体电池各有一个电极端子未与其它电极端子连接,并且这两个电极端子的极性相反,作为电池组的正负极。
电极端子之间的连接方式为贴合,只要将需要连接的片状电极端子贴合在一起并且使电极端子之间有一定的连接强度即可,优选情况下,将片状电极端子焊接。焊接可以为现有的各种焊接方法,例如冷压焊、超声波焊、激光焊、钎焊、闪光对焊、摩擦焊、电阻焊等,优选采用冷压焊。使用冷压焊仅需提供足够的静压力就可以实现可靠焊接,且焊接过程中被焊对象发热量小、无震动和无相对位移。
所述单体电池可以为任何形式的电池,如方形电池和圆柱形电池。为了便于安装片状体的电极端子和组装电池组,单体电池优选为方形电池。片状体的电极端子的宽度可以为单体电池宽度的5-40%,优选为10-25%;电极端子的厚度可以为单体电池厚度的1-20,优选为3-15%。电极端子可以为任何导电材料,优选为铜、镍和铝中的一种或几种。
将多个单体电池连接之后,还可以按照现有的方法将电池组固定,例如,在相邻的单体电池之间设置散热结构,并使用紧固结构将连接后的单体电池固定在一起,防止单体电池之间发生位置移动。
如图3所示,所述电池外壳4的一端为盖板7,盖板7具有通孔,电极端子的一端穿过该通孔至电池外壳4外部,并且盖板7与电极端子之间由密封件密封。
如图5和6所示,所述密封件包括铆钉8和绝缘弹性部件9,电极端子从内向外依次被绝缘弹性部件9和铆钉8夹持,并且铆钉8被压紧。所述绝缘弹性部件9可以为具有弹性的绝缘材料,例如塑料、橡胶等。图5表示铆钉被压紧之前的状态,图6表示铆钉被压紧之后的状态。如图6所示,铆钉8被压紧后,绝缘弹性部件9发生弹性变形,绝缘弹性部件紧贴片状体的电极端子和铆钉内壁,从而达到使电极端子密封的目的。采用该密封形式,可以使盖板与电极端子之间的密封更加紧密,有效地防止外界水分等杂质进入电池内部。
更优选的情况下,所述铆钉8、绝缘弹性部件9和电极端子为一体结构。即,可以先将铆钉8、绝缘弹性部件9和电极端子通过注塑工艺整合为一体结构,再将该整体结构与盖板的通孔配合,然后如图6所示,压紧铆钉,使电极端子密封。采用该优选实施方式,可以更容易地实现紧密的密封效果。
正负极端子可以直接与正负极片相连,例如,可以将正极端子与正极极片焊接,将负极端子与负极极片焊接。优选情况下,如图4所示,所述正极极片5上具有正极极耳10,正极极耳10与正极端子2连接,所述负极极片6上具有负极极耳11,负极极耳11与负极端子3连接。
正极极耳和负极极耳可以为各种导电材料,优选为铜、镍和铝中的一种或几种。电极端子与极耳以及极耳与极片的连接方式优选为焊接,例如超声波焊、冷压焊、激光焊、钎焊、闪光对焊、摩擦焊、电阻焊。
如图3和图4所示,负极极耳11与负极端子3的焊接处以及正极极耳10与正极端子2的焊接处分别设置有绝缘圈12。绝缘圈12为两段式结构,在组装时,将两段式的绝缘圈围在所述焊接处的周围,起到绝缘、减震的作用,提高电池的安全性能。绝缘圈可以由现有的各种绝缘材料制成,如塑料、橡胶等。
所述单体电池可以为现有的各种适于组成电池组的单体电池,例如碱性二次电池、锂离子电池等。各种单体电池的正负极片的结构已为本领域技术人员所公知,在此不再赘述。
从以上描述可以看出,在本发明提供的电池组中,单体电池的电极端子即正极端子和负极端子为片状体,通过将单体电池的电极端子焊接而将多个单体电池电连接在一起,单体电池之间几乎不存在接触内阻,而且焊接后的电极端子不可能松动,因此,与现有的单体电池之间采用螺纹连接的电池组相比,可以显著地降低电池组的内阻。
此外,本发明的电池组采用片状体作为电极端子,不需要额外增加连接件,可以直接将电极端子焊接,因此,可以减小电池组的重量和体积。
Claims (8)
1、一种电池组,该电池组包括多个单体电池(1),所述单体电池(1)包括电池外壳(4)、电芯和电极端子,所述电芯包涵于电池外壳(4)中,电芯包括正极极片(5)、负极极片(6)以及位于正极极片(5)和负极极片(6)之间的隔膜(13),所述电极端子包括正极端子(2)和负极端子(3),正极端子(2)与正极极片(5)电相连,负极端子(3)与负极极片(6)电相连,单体电池之间通过电极端子串联或并联连接,其特征在于,所述电极端子为片状体,电极端子之间的连接关系为贴合连接。
2、根据权利要求1所述的电池组,其中,一个单体电池的一个电极端子与相邻的一个单体电池的极性相反的电极端子连接,并且另一个电极端子与另一个相邻的单体电池的极性相反的电极端子连接。
3、根据权利要求1所述的电池组,其中,所述单体电池(1)为方形电池,电极端子的宽度为单体电池宽度的5-40%,电极端子的厚度为单体电池厚度的1-20%。
4、根据权利要求1所述的电池组,其中,所述电池外壳(4)的一端为盖板(7),盖板(7)具有通孔,电极端子的一端穿过该通孔至电池外壳(4)外部,盖板(7)与电极端子之间由密封件密封。
5、根据权利要求4所述的电池组,其中,所述密封件包括铆钉(8)和绝缘弹性部件(9),电极端子从内向外依次被绝缘弹性部件(9)和铆钉(8)夹持,并且铆钉(8)被压紧于绝缘弹性部件(9)上。
6、根据权利要求5所述的电池组,其中,所述铆钉(8)、绝缘弹性部件(9)和电极端子为一体结构。
7、根据权利要求1所述的电池组,其中,所述正极极片(5)上具有正极极耳(10),正极极耳(10)与正极端子(2)连接,所述负极极片(6)上具有负极极耳(11),负极极耳(11)与负极端子(3)连接。
8、根据权利要求7所述的电池组,其中,负极极耳(11)与负极端子(3)的连接处以及正极极耳(10)与正极端子(2)的连接处分别设置有绝缘圈(12)。
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CN2007101037713A CN101315990B (zh) | 2007-05-29 | 2007-05-29 | 一种电池组 |
JP2009552988A JP2010521046A (ja) | 2007-05-29 | 2007-12-27 | バッテリーパック |
KR1020097015550A KR101075681B1 (ko) | 2007-05-29 | 2007-12-27 | 배터리 팩 |
EP07846174.6A EP2150997B1 (en) | 2007-05-29 | 2007-12-27 | Battery pack |
EA200900792A EA018048B1 (ru) | 2007-05-29 | 2007-12-27 | Батарейный источник питания |
US12/523,097 US20100104939A1 (en) | 2007-05-29 | 2007-12-27 | Battery pack |
BRPI0721354-9A BRPI0721354A2 (pt) | 2007-05-29 | 2007-12-27 | Pacote de bateria |
PCT/CN2007/071348 WO2008144994A1 (en) | 2007-05-29 | 2007-12-27 | Battery pack |
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EP (1) | EP2150997B1 (zh) |
JP (1) | JP2010521046A (zh) |
KR (1) | KR101075681B1 (zh) |
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BR (1) | BRPI0721354A2 (zh) |
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- 2007-12-27 WO PCT/CN2007/071348 patent/WO2008144994A1/en active Application Filing
- 2007-12-27 EP EP07846174.6A patent/EP2150997B1/en active Active
- 2007-12-27 EA EA200900792A patent/EA018048B1/ru not_active IP Right Cessation
- 2007-12-27 BR BRPI0721354-9A patent/BRPI0721354A2/pt not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
WO2008144994A1 (en) | 2008-12-04 |
EP2150997B1 (en) | 2014-02-12 |
EA018048B1 (ru) | 2013-05-30 |
EP2150997A1 (en) | 2010-02-10 |
JP2010521046A (ja) | 2010-06-17 |
KR20090096732A (ko) | 2009-09-14 |
US20100104939A1 (en) | 2010-04-29 |
BRPI0721354A2 (pt) | 2014-02-25 |
CN101315990B (zh) | 2010-06-09 |
EP2150997A4 (en) | 2010-07-14 |
EA200900792A1 (ru) | 2010-04-30 |
KR101075681B1 (ko) | 2011-10-21 |
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