CN1292575A - 矩形密封式电池 - Google Patents
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Abstract
一种矩形密封式电池,包括有宽、窄侧面3b、3a的长方体状电池槽3、与电池槽3的宽侧面平行的多片正、负极板夹着隔膜层叠而成的极板组5及在极板组5的宽度方向两端分别与正、负极板接合的正、负极集电板6,各集电板6固定于电池槽3的窄侧面3a,电池槽3内装有电解液并由盖体4密封其开口部。因极板组5定位固定于电池槽,故极板组对电池槽能正确定位,不受充放电时极板组膨胀收缩而变形的影响,电池性能不会因此下降,能保证注液时液体分布的均匀性。
Description
本发明涉及在长方体状电池槽内装入电解液和与电池槽的宽侧面平行的正极板与负极板夹着隔膜层叠而成的极板组,并用盖体密封电池槽开口的矩形密封式电池。
近年来,在能源密度方面良好的镍氢电池等的碱性二次电池已被用作汽车用电源。而作为小型紧凑但能获得大功率的二次电池,例如日本发明专利公开1995年第161377号公报等提出了一种矩形密封式电池,该电池在长方体状电池槽内装入电解液和由与电池槽的宽侧面平行的正极板和负极板夹着隔膜层叠而成的极板组,并用盖体封闭电池槽开口。
现参照图4进行说明。31是聚丙烯制的电池槽,32是聚丙烯制的盖体,将极板组33与电解液一起收容配置在电池槽31内,并用盖体32进行密封。极板组33由在平板状芯材上涂有以氢吸藏合金为主要成分的糊的负极板与以氢氧化镍为主要成分的粉末充填在镍多孔体构成的芯材内而成的正极板夹着亲水化处理后的聚丙烯制隔膜层叠起来而构成。极板组33的正极板和负极板分别通过集电体34a、34b与正极和负极的极柱35a、35b连接,这些极柱35a、35b安装固定在盖体32上。在该状态下,极板组33与电池槽31的内底面之间形成有2-10mm左右的间隙t1,与内侧面之间形成有1-5mm左右的间隙t2。
通过形成这样的间隙t1、t2,以实现电解液注入时的液体分布的均匀化,即使随着充放电极板组33发生膨胀收缩,极板组33也不受到电池槽31内壁面的压迫,防止发生极板组33发生变形、活性物质不能有效利用使放电容量下降,及引起充电时内压上升、内部短路或活性物质脱落等的情况。
但是,因为上述现有的矩形密封式电池的结构,是将极板组33通过极柱35a、35b固定在盖体32上的,因此,由于电池槽31与盖体32融接时发生相互位置的偏移,极板组33相对电池槽31的位置会发生误差,就不能保证上述间隙t1、t2的准确性,就会发生这样的问题:随着充放电极板组33发生膨胀收缩,极板组33发生变形、活性物质不能有效利用使放电容量下降,或导致充电时内压上升、内部短路及发生活性物质脱落等的情况,另外还存在电解液注入时液体分布不均匀这样的问题。
鉴于上述现有技术存在的问题,本发明的目的在于,提供这样一种矩形密封式电池,其极板组不会受盖体融接时位置发生偏移的影响,能相对电池槽正确定位并固定,不会因充放电时极板组膨胀收缩而变形,电池性能不因此而下降,并能保证注入液体时液体分布的均匀性。
本发明的矩形密封式电池,包括具有宽度窄的窄侧面和宽度宽的宽侧面的长方体状电池槽,由与电池槽的宽侧面平行的多个正极板与负极板夹着隔膜层叠而成的极板组,以及在极板组的宽度方向两端分别与正极板和负极板接合的正极和负极的集电板,因为是将各集电板固定在电池槽的窄侧面而将极板组配置在电池槽内,并在该电池槽内装入电解液再用盖体封闭电池槽开口部的,极板组通过集电极固定在电池槽中,所以,不会受到将盖体融接到电池槽上时发生位置偏移的影响,能将极板组相对电池槽定位固定在适当位置,因此,通过定位时使电池槽的内底面及窄侧面与极板组之间形成适当的间隙,就不会受到充放电时极板组随膨胀收缩而变形的影响,不会因此而导致的电池性能的下降。
此外,如果在电池槽窄侧面形成贯穿的连接孔,将设于集电板的连接凸部嵌入该连接孔,使相邻电池槽内集电板的连接凸部相互接合或与配置在电池槽外面的极端子的连接凸部接合,并将集电板固定在电池槽的窄侧面,就能将经窄侧面连接相邻极板组的连接结构或将极板组与电池槽外面极端子连接的连接结构同时用作极板组相对电池槽的固定结构。
此外,如果将极板组的两种极性的极板重合的重叠部分与电池槽底面之间的距离W1设定为满足0.5mm≤W1≤3mm的范围,将重合部分两侧边与集电板之间的距离W2设定在满足2mm≤W2≤10mm的范围,则电池槽内底面及窄侧面与极板组之间就不会受到充放电时随着极板组膨胀收缩发生的变形的影响,不会因此导致电池性能的下降,而且通过该间隙可以方便且稳定地注入电解液并能保证液体分布的均匀性。
附图简介。
图1所示为应用本发明的矩形密封式电池的组合型二次电池的一实施形态,其中(a)为俯视图,(b)为主视图。
图2所示为上述实施形态的局部纵剖主视图。
图3所示为上述实施形态的主要部分纵剖主视图。
图4所示为现有例子的矩形密封式电池的纵剖主视图。
以下参照图1-图3,对本发明矩形密封式电池的一实施形态进行说明。
本实施形态的矩形密封式电池1是能适合用作电动汽车的驱动电源的镍、氢二次电池,如图1、图2所示,由多个(在图示例子中为6个)具有宽度窄的窄侧面和宽度宽的宽侧面且上面开口的长方体状电池槽3在共用其窄侧面3a的情况下相互一体连接而成的一体电池槽2构成,且各电池槽3的上面开口由一体盖体4一体性封闭。
如后面将详细说明的那样,在各电池槽3内,装有电解液、极板组5及与极板组的两侧端面接合的集电板6而构成单体电池7,所述极板组5由与电池槽3的宽侧面平行的多个正极板与负极板夹着隔膜沿窄侧面方向层叠而成。
在一体电池槽2两端的电池槽3的窄侧面3a及各电池槽3、3之间的窄侧面3a的上端部形成有连接孔8,如后面将详细说明的那样,在两端电池槽3外侧的窄侧面3a的连接孔8安装有正极或负极的极端子9,并通过中间电池槽3、3之间的窄侧面3a的连接孔8,将两侧的单体电池7、7串联连接。
在盖体4的上侧面并在相互相邻的电池槽3、3的相邻端部,形成有通孔10,同时在盖体4之上,融接着形成有使这些通孔10、10之间连通的连通道12的连通盖11。11a为凸出设于连通盖11的内侧面中央部分的增强凸起,大小为不关闭连通道12的大小,其顶端抵靠并融接在盖体4的上侧面,来保证连通盖11的耐压强度。一体电池槽2和盖体4及连通盖11由PP/PPE掺混聚合物等的合成树脂材料构成,对电解液具有憎液性。
此外,盖体4上设有当各电池槽3的内部压力达到一定压力以上时释放压力用的单一的安全阀13,另外,盖体4上凹入形成有检测单体电池7温度的温度检测传感器安装用的传感器安装孔14,该凹入形成的传感器安装孔14与适当单体电池7的极板组5的上端接触。
在各电池槽3的宽侧面成一平面的一体电池槽2的宽侧面15上,在与各电池槽3的两侧端对应的位置,凸出设有上下方向延伸的筋条16,且在筋条16、16之间,以适当间距的间隔矩阵状凸出设有多个较小的圆形凸部17。这些筋条16与凸部17高度相同。还有,在电池槽3上端部与盖体4的侧面,与筋条16的延长位置及凸部17的配置位置对应,以跨接它们的侧面之间的形态,形成有与筋条16和凸部17相同高度的连接筋条18a及18b。这些筋条16、凸部17及连接筋条18a、18b在并列配置一体电池槽2时,在它们之间形成有效且均匀地冷却各电池槽3用的制冷剂通道。
此外,在相对一体电池槽2的宽侧面15的中心线位于对称位置的任意的电池槽3的大致中央位置,设有当一体电池槽2以其宽侧面15相互重叠时相互嵌合的多个定位用凸部19和凹部20。
如图3所示,上述极板组5是将多片正极板21与多片负极板22交替配置,同时在各正极板21外包覆横方向有开口部的袋状隔膜23而在正极板21与负极板22之间夹入隔膜23,在此状态下层叠而成极板组5。在图3中,交叉斜线所示的区域为正极板21与负极板22夹着隔膜23相对、起产生电能作用的重叠部分24。这些正极板21的极板组与负极板22的极板组相互相反侧的侧边部向外侧伸出,其伸出侧边部构成为引线部21a、22a,在其侧端边分别焊接有集电板6。29为焊接引线部21a、22a与集电板6的焊料,在集电板6上沿其长度方向隔开适当间隔配置有数个。
正极板21由Ni的发泡金属构成,引线部21a是对发泡金属进行加压压缩并通过超声波焊接将引线板缝焊到其一个面上而构成的。此外,负极板22是在Ni冲压金属板上,在引线部22a之外的部分涂上活性物质而构成的。
25是在引线部21a、22a上上下相隔适当间隔分别形成的多对定位孔,将定位销插入该定位孔并推压引线部21a、22a的侧端边,来对齐引线部21a、22a的侧端边,就能将该侧端边与集电板6可靠且均匀地焊接。
在两侧端边焊接有集电板6的极板组5如图2所示,通过使在集电板6的上端部向外凸出形成的连接凸部26嵌入贯穿形成于电池槽3的窄侧面3a上端部的连接孔8,相对电池槽3就被定位,并且,通过对在相邻电池槽3、3之间嵌入连接孔8的连接凸部26、26的顶端进行焊接使其相互接合,就被固定在电池槽3的两窄侧面3a上,同时相邻的单体电池7的电连接就在内部进行。
此外,在两端的电池槽3外侧的窄侧面3a处,在极端子9上凸出设有嵌入连接孔8的连接凸部27,连接凸部26、27的顶端相互焊接接合。另外,在集电板6的连接凸部26或极端子9的连接凸部27的周围形成有环状槽,设有在与窄侧面3a之间进行密封的O型圈28。
在这样极板组5定位固定在电池槽3内的状态下,如图3所示,两种极性的极板重合的重叠部分24与电池槽3的内底面之间的距离W1设定在满足0.5mm≤W1≤3mm的范围。此外,将重叠部分24的两侧边与集电板6之间的距离W2设定在满足2mm≤W2≤10mm的范围。
在以上构成的矩形密封式电池1中,将在两侧端接合有集电板6的极板组5插入配置在各电池槽3内,使集电板6的连接凸部26嵌入贯穿形成于电池槽3的窄侧面3a的连接孔8内,在相邻电池槽3、3之间将连接凸部26的顶端相互焊接,在两端的电池槽3外侧的窄侧面3a处,将连接凸部26与极端子9的连接凸部27的顶端相互焊接,由此,在各电池槽3中,极板组5被正确定位固定。与此同时,相邻的单体电池7相互串联连接,其两端与伸出于一体电池槽2的两端的极端子9连接。
这样,经窄侧面3a在相邻的电池槽3、3之间连接极板组5的结构,或将极板组5与极端子9连接的结构,就可以同时用作极板组5相对电池槽3的固定结构,所以,以简单、廉价的结构就可以获得小型紧凑的矩形密封式电池。另外,因为可以在一体电池槽2的内部进行相邻单体电池7的连接,单体电池7的连接结构不露出到外部,所以可以使矩形密封式电池1的设置空间小型紧凑。
此外,因为如上所述,在将极板组5定位固定在各电池槽3内的状态下,极板组5的两种极性的极板重合的重叠部分24与电池槽3底面之间的距离W1设定为0.5mm≤W1≤3mm,将重叠部分24的两侧边与集电板6之间的距离W2设定为2mm≤W2≤10mm,所以,在这样将极板组5配置固定在电池槽3内的状态下,用液体注射喷嘴将电解液从集电板6与极板组5两侧端之间的间隙的上端注入电池槽3内,就能方便且稳定地注入电解液,同时由于电解液通过上述间隙顺畅分散,所以可以保证液体分布的均匀性,电池性能可以保证稳定。
这样将电解液注入结束之后,将盖体4融接在一体电池槽2的上端,就完成矩形密封式电池1。
在该矩形密封式电池1中,因为在电池槽3的内底面及窄侧面3a与极板组5之间能适当保证有如上所述的间隙,所以,不会受到随着充放电时极板组5的膨胀收缩发生的变形的影响,不会因此导致电池性能的下降。
此外在本实施形态中,因为用通过集电板6的冲压成形而凸出成型的连接凸部26来将相邻的单体电池7串联连接的,所以,不需要另外的连接部件,可以用少的部件数低成本方便地进行连接,又因为连接凸部26与集电板6为一体且在1个部位进行焊接,所以连接的电阻可以极小。
此外,在各单体电池7的极板组5中,因为使正极板21的极板组与负极板22的极板组的相互相反侧的侧边部从相对部分向外侧伸出,将其伸出部分作为引线部21a、22a,并相对该引线部21a、22a在其整个长度固定集电板6,所以,从极板21、22的整个面至集电板6的平均距离可以缩短,其结果是,可以降低电池内电阻值,同时电极活性物质的利用率增高,可以提高电池输出。
此外,在相互相邻的电池槽3、3的相邻端部,在盖体4形成有通孔10,并在盖体4之上融接着形成有使这些通孔10、10之间连通的连通道12的连通盖11,因此,各电池槽3之间的内部压力变均匀,可以防止因一部分电池槽3的内部压力上升使该单体电池7的寿命下降而使整个矩形密封式电池1的寿命随之缩短,同时,在盖体4上只要设置单一的安全阀13即可,可以使成本下降。
若采用本发明的矩形密封式电池,如根据以上说明已知的那样,因为在极板组的宽度方向两端设置与正极板和负极板分别接合的集电板,并将各集电板固定在电池槽的窄侧面,所以,不会受到将盖体融接到电池槽上时位置偏移的影响,能将极板组相对电池槽定位固定在适当位置,因此,通过定位时使电池槽的内底面及窄侧面与极板组之间形成有适当的间隙,就不会受到充放电时极板组随膨胀收缩而变形的影响,可以避免因此而导致的电池性能的下降。
此外,如果在电池槽窄侧面形成贯穿的连接孔,将设于集电板的连接凸部嵌入该连接孔,使相邻电池槽内集电板的连接凸部相互接合或与配置在电池槽外面的极端子的连接凸部接合,将集电板固定在电池槽的窄侧面,就能将经窄侧面连接相邻电池槽间极板组的连接结构或将极板组与电池槽外面极端子连接的连接结构同时用作极板组相对电池槽的固定结构,就能以简单、廉价的结构获得小型紧凑的矩形密封式电池。
此外,如果将极板组的两种极性的极板重合的重叠部分与电池槽底面之间的距离W1设定为满足0.5mm≤W1≤3mm的范围,将重叠部分两侧边与集电板之间的距离W2设定在满足2mm≤W2≤10mm的范围,则电池槽内底面及窄侧面与极板组之间就不会受到充放电时随着极板组膨胀收缩发生的变形的影响,不会因此导致电池性能的下降,而且通过该间隙进行电解液的注入,就可以方便且稳定地注入电解液并能保证液体分布的均匀性。
Claims (3)
1.一种矩形密封式电池,其特征在于,包括具有宽度窄的窄侧面和宽度宽的宽侧面的长方体状电池槽,由与电池槽的宽侧面平行的多个正极板与负极板夹着隔膜层叠而成的极板组,以及在极板组的宽度方向两端分别与正极板和负极板接合的正极和负极的集电板,各集电板固定在电池槽的窄侧面从而将极板组配置在电池槽内,在该电池槽内装有电解液并由盖体封闭电池槽开口部
2.根据权利要求1所述的矩形密封式电池,其特征在于,在电池槽窄侧面形成贯穿的连接孔,将设于集电板的连接凸部嵌入该连接孔,使相邻电池槽内集电板的连接凸部相互接合或与配置在电池槽外面的极端子的连接凸部接合,将集电板固定在电池槽的窄侧面。
3.根据权利要求1或2所述的矩形密封式电池,其特征在于,极板组的两种极性的极板重合的重叠部分与电池槽底面之间的距离W1设定为满足0.5mm≤W1≤3mm的范围,将重叠部分两侧边与集电板之间的距离W2设定在满足2mm≤W2≤10mm的范围。
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US6304057B1 (en) | 2001-10-16 |
EP1091427A1 (en) | 2001-04-11 |
JP2001110381A (ja) | 2001-04-20 |
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DE60001206T2 (de) | 2003-09-25 |
CN1174498C (zh) | 2004-11-03 |
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DE60001206D1 (de) | 2003-02-20 |
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