CN101908656B - 二次电池异常检测装置 - Google Patents
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Abstract
本发明提供一种二次电池异常检测装置,其具有:具有导电性的连接板(14),其将多个电池单体(11)的电极端子(12)彼此连结;结合部件(16),其结合连接板和电极端子;温度检测装置(32),其设置为接近由结合部件形成的连接板和电极端子之间的结合部,检测结合部周围的温度;以及异常判定装置(40),其根据温度检测装置的温度检测值,判定电池单体或者结合部件的异常。
Description
技术领域
本发明涉及一种二次电池异常检测装置,具体地说,涉及一种检测对连结电池单体的连接板及电池单体的端子进行结合的结合部件的松弛的技术。
背景技术
当前,搭载于电动汽车上的锂离子电池形成将由多个电池单体构成的电池模块并联或串联连接的构造,构成为向车辆供给电力。
由此,为了连接多个电池单体,通常使用下述构造,即,在电池单体的端子之间使用汇流条(busbar)等具有导电性的连接板进行连接,利用结合部件进行结合配置。
然而,存在结合连接板及端子的接合部件因振动等而松弛的情况,产生由于接合部件松弛而使端子与连接板之间的接触电阻增大,因此招致能量损失的问题。
根据上述情况,当前已知一种在各个结合部件上安装压力传感器以检测结合部件的松弛的方法(参照日本国特开平9-306468号公报)。
但是,在电动汽车上搭载有许多电池模块,与此相伴存在许多结合部。将多个电池单体进行连接而构成的电池组件也同样存在许多结合部。
基于这一点,在上述专利文献1所公开的现有技术中,存在下述问题,即,由于形成在各个结合部件上安装压力传感器的结构,所以压力传感器的数量增多,因此,部品费用增加。另外,大量的配线收容在电池组件内,保养性较差,并不优选。
发明内容
本发明就是为了解决上述课题而提出的,其目的在于,提供一种形成简单的结构并可以检测结合部件的松弛的二次电池异常检测装置。
为了实现上述目的,本发明的二次电池异常检测装置的特征在于,具有:具有导电性的连接板,其将多个电池单体的电极端子彼此连结;结合部件,其结合该连接板和该电极端子;温度检测装置,其设置为接近由该结合部件形成的所述连接板与所述电极端子之间的结合部,检测该结合部周围的温度;以及异常判定装置,其根据该温度检测装置的温度检测值,判定所述电池单体或者所述结合部件的异常。
这样,如果结合部件松弛,则伴随着接触电阻增大而发热,结合部的温度上升,通过在结合部附近配置温度检测装置,检测结合部周围的温度,由此,可以检测电池单体的温度以及所述的由于结合部件的松弛而引起的温度上升这两者,可以判定电池单体或结合部件的异常。
另外,由于在上述的检测电池单体的温度及由于结合部件的松弛而引起的温度上升中,共用温度检测单元,所以可以抑制成本。
而且,因为通过在结合部附近配置温度检测装置,从而可以容易地确定温度异常的发生位置,所以可以减少保养所需的时间,提高作业效率。
优选在从所述电极端子至所述连接板流过大于或等于规定的负载电流时,所述异常判定装置根据所述温度检测装置的温度检测值,检测并判定所述结合部件的松弛。
由此,可以区分电池单体的温度异常和由于结合部件的松弛而引起的温度异常。
更优选在每个所述电池单体中分别设置多个所述电极端子,在由所述温度检测装置对每个所述电池单体检测出的所述结合部的多个温度检测值中,任一个超过规定的温度时,所述异常判定装置判定为所述结合部件存在松弛。
由此,可以区分电池单体的温度异常和由于结合部件的松弛而引起的温度异常。
进一步优选所述温度检测装置为热敏电阻器。
由此,可以抑制部件成本。
更进一步优选所述电极端子与具有导电性及导热性的金属板的一端连接,该金属板的另一端与监视所述电池单体的状态的电池监视装置的基板连接,所述温度检测装置与所述金属板接近地配置于所述电池监视装置的基板上。
由此,通过将温度检测装置与电池监视装置基板一体化,从而不需要复杂的配线,可以以节省空间的方式设置温度检测装置。
本发明根据下述详细说明及附图,可以更加完整地理解,其中,该附图仅用于举例,并不限定本发明。
附图说明
本发明根据下述详细说明及附图,可以更加完整地理解,其中,该附图仅用于举例,并不限定本发明。
图1是表示本发明所涉及的二次电池异常检测装置的概略结构的系统图;
图2是本发明所涉及的二次电池异常检测装置的概略结构图;
图3是图2的上表面图;以及
图4是表示在图2所示的二次电池异常检测装置中进行的电池单体异常检测处理程序的流程图。
具体实施方式
下面,参照附图说明本发明的一个实施方式。
图1是表示本发明所涉及的二次电池异常检测装置的概略结构的系统图。
如图1所示,安装在电动汽车上的驱动用蓄电池1是将多个电池模块10串联连接而构成的。该电动汽车具备来自外部电源的充电路径,构成为经由充电器进行蓄电,其中,该充电器从该充电路径接受电力供给而进行充电。
一个电池模块10具备多个电池单体11而构成。而且,在电池模块10中具备监视各自的充电状态的电池监视单元(下面简称为CMU)30。在将电池模块10串联连接的配线50上设置有电流传感器60,其检测驱动用蓄电池1整体的输入输出电流。
CMU 30与蓄电池管理控制单元(异常判定装置,下面简称为BMU)40连接。在BMU 40中输入来自各个CMU 30的各个电池模块10的充电状态信息、和来自电流传感器60的驱动用蓄电池1的输入输出电流值,并向电子控制单元(ECU)70传送蓄电池信息。
图2是构成本发明所涉及的二次电池异常检测装置的电池模块10的概略结构图。
如图2所示,电池模块10构成为,在多个电池单体11的电极端子12之间使用汇流条(连接板)14连接,利用结合部件(例如螺母)16串联地进行固定。电极端子12与具有导电性和导热性的金属板18的一侧连接,金属板18的另一侧与金属端子20结合。金属端子20经由金属板18与电极端子12电气结合及热结合,可以检测电池单体11的电压。此外,在此,将电池单体11的电极端子面侧定义为上侧。
另外,在电池模块10中,具备CMU 30的电池监视装置基板31横跨构成电池模块10的多个电池单体11,配置在金属板18的上侧,并利用上述金属端子20进行结合。在电池监视装置基板31上设置有热敏电阻器(温度检测装置)32。
具体地说,如图3所示,热敏电阻器32与金属板18隔着配线(未图示)而配置在电池监视装置基板31上,以接近结合部件16的接合部,并位于金属板18的附近,如后述所示,对从电极端子12经由金属板18传导来的上述结合部周围的热进行检测。
返回图2,电池监视装置基板31与BMU 40的输入侧连接。在BMU40中,基于来自电池监视装置基板31的信息,监视构成电池组件的所有电池单体11的状态(电压、温度等)。
下面,对如上述所示构成的本发明所涉及的二次电池异常检测装置的作用进行说明。
如果在汇流条14中流过负载电流,则在由结合部件16形成的结合部周围、例如电极端子12处,与汇流条14或结合部件16之间的接触电阻成正比地引起发热。在此,通常在这种电动汽车中,存在车辆的驱动用电动机所使用的高压电流、和搭载于车辆上的配件等所使用的低压电流,在汇流条14中流过前者的高压负载电流。由此,在结合电极端子12和汇流条14的结合部件16松弛的情况下,由于接触电阻增大,因此发热量也变大。电极端子12处的发热从金属板18传导至设置于电池监视装置基板31上的热敏电阻器32。这样,热敏电阻器32对电极端子12处的发热进行检测。另外,由于发热量也与负载电流量成正比,因此,对于在负载电流大于或等于规定值(例如10安培)时热敏电阻器32所检测到的发热,可以明确地区分是由于结合部件16的松弛引起的发热还是由于电池异常引起的发热。
在此,对异常判定处理进行说明,该异常判定处理在检测出的温度大于或等于规定温度时,对结合部件16的松弛进行判定。
在图4中示出BMU 40执行的异常判定处理程序的流程图,下面,根据该流程图进行说明。
在步骤S1中,将车辆的电源设为ON,或者通过将电源连接器与100V或200V的外部电源连接,从而充电器接受电力。
在步骤S2中,通过配置于电池监视装置基板31上的热敏电阻器32,检测并收集各个电池单体的温度Tc。
在步骤S3中,判定收集到的电池单体温度Tc是否大于或等于规定温度Tmax。在判定为该判定结果为真(是)的情况下,前进至步骤S4。
在步骤S4中,判定是否在汇流条14中流过大于或等于规定的负载电流。在判定为该判定结果为真(是)的情况下,前进至步骤S5。
在步骤S5中,判定在对相同电池单体11的温度进行检测的热敏电阻器32中,是否任一侧大于或等于规定温度Tmax。
具体地说,如图3所示,判定在对位于相同电池单体11中的电极端子12a、12b的温度进行测定的热敏电阻器32a、32b中,是否任一侧大于或等于规定温度Tmax。在该判定结果为真(是)的情况下,前进至步骤S6。
在步骤S6中,判定为结合汇流条14和电极端子12的结合部件16存在松弛。
另一方面,在上述步骤S4的判定结果为假(否)或者步骤S5的判定结果为假(否)的情况下,前进至步骤S7。
在步骤S7中,判断出电池单体11的发热,而判定为电池单体11异常。
另一方面,在上述步骤S3的判定结果为假(否)的情况下,前进至步骤S8。
在步骤S8中,判定为电池单体11正常,前进至步骤S9。
在步骤S9中,判定是否车辆的电源设为ON、或者充电器正在接受电力。在该判定结果为真(是)的情况下,返回步骤S2,在该判定结果为假(否)的情况下,结束本电池单体异常检测处理程序。
如上所示,根据本发明的实施方式,将设置在电池监视装置基板31上的热敏电阻器32配置为位于金属板18的附近。而且,在汇流条14中流过大于或等于规定的负载电流的情况下,配置于电池监视装置基板31上的热敏电阻器32检测出大于或等于规定值的温度,如果在对相同电池单体11的电极端子12a、12b的温度进行检测的热敏电阻器32a、32b中,任一侧的温度大于或等于规定值,则判断为结合电极端子12和汇流条14的结合部件16存在松弛。
由此,热敏电阻器32可以检测电池单体11的温度,并且还可以检测由于结合电极端子12和汇流条14的结合部件16的松弛而引起的发热。这样,因为在电池单体11及由结合部件16形成的结合部周围的温度检测中共用热敏电阻器32,所以可以抑制成本。
另外,通过温度传感器使用廉价的热敏电阻器,可以抑制部件成本。
而且,因为可以容易地确定温度的异常位置,所以可以缩短保养所需的时间,可以提高作业效率。
另外,可以区分由于电池单体11的异常引起的温度异常和由于结合部件16的松弛引起的温度异常,从而进行判定。
并且,热敏电阻器32配置于电池监视装置基板31上,由于结合部件16的松弛引起的发热传导至金属板18及设置于电池监视装置基板31上的热敏电阻器32,因此,不需要复杂的配线,可以以节省空间的方式设置热敏电阻器32。
以上结束了实施方式的说明,但本发明并不限定于上述实施方式。
例如,在上述实施方式中,将热敏电阻器32配置在电池监视装置基板31上,但也可以将热敏电阻器32配置在汇流条14或结合部件16上。
另外,作为温度传感器而使用热敏电阻器32,但只要可以检测温度即可,并不特别限定于热敏电阻器。
并且,在一个电池单体11的温度检测中使用了2个热敏电阻器,但热敏电阻器的数量并不限定为2个。
Claims (4)
1.一种二次电池异常检测装置,其特征在于,具有:
具有导电性的连接板(14),其将多个电池单体(11)的电极端子(12)彼此连结;
结合部件(16),其结合该连接板和该电极端子;
温度检测装置(32),其设置为接近由该结合部件形成的所述连接板和所述电极端子之间的结合部,检测该结合部周围的温度;以及
异常判定装置(40),其根据该温度检测装置的温度检测值,判定所述电池单体或者所述结合部件的异常,
在从所述电极端子(12)至所述连接板(14)流过大于或等于规定的负载电流时,所述异常判定装置(40)根据所述温度检测装置(32)的温度检测值,检测并判定所述结合部件(16)的松弛。
2.根据权利要求1所述的二次电池异常检测装置,其特征在于,
在每个所述电池单体(11)中分别设置多个所述电极端子(12),
在由所述温度检测装置(32)对每个所述电池单体检测出的所述结合部的多个温度检测值中,任一个大于或等于规定温度时,所述异常判定装置(40)判定为所述结合部件(16)存在松弛。
3.根据权利要求1所述的二次电池异常检测装置,其特征在于,
所述温度检测装置(32)为热敏电阻器。
4.根据权利要求1所述的二次电池异常检测装置,其特征在于,
所述电极端子(12)与具有导电性和导热性的金属板(18)的一端连接,该金属板的另一端与监视所述电池单体(11)的状态的电池监视装置的基板(31)连接,
所述温度检测装置(32)与所述金属板接近地配置于所述电池监视装置的基板上。
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