CN103158575A - 电池组分布式绝缘检测电路 - Google Patents
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Abstract
本发明是电池组分布式绝缘监测电路。车辆的动力系统,包括至少两个相互隔开的电池组。第一电池组包括多个电池单元和与该电池单元电连接的开关元件。第二电池组包括与开关元件串联电连接的电阻器,以及设置用以检测指示与第一电池组关联的泄漏电流的电阻器两端电压的感应电路。
Description
技术领域
本发明涉及用于机动车辆中的电池组的绝缘检测电路。
背景技术
为驱动电动或混合电动车,可能需要高电压以增加电源的输出:输出是与电压和电流的乘积成比例的。用于驱动电动的或者混合电动的车辆的电源的输出电压例如可为200V或者更大。这些电源可能未接地。因此,与这些电源相关的泄漏电流可能是不期望的。当在电源与底盘之间存在电阻时,可能存在泄漏电流。
发明内容
车辆可包括在车辆内相互隔开的第一和第二电池组,以及泄漏检测电路。该泄漏检测电路可包括设置在第一电池组内且与底盘接地电连接的第一精密电阻器,以及设置在第二电池组内且与第一精密电阻器串联电连接的开关元件和第一串联限制电阻器。该泄漏检测电路响应第二电池组内的泄漏电流。
车辆可包括位于车辆内不同位置的多个电池组。该电池组的一个可包括多个电阻器,每个电阻器与底盘接地和该电池组中另一个电连接,以及设置用以检测每个电阻器两端电压的感应电路。车辆可进一步包括至少一个设置用以基于检测到的电压确定与其他电池组关联的泄漏电流的存在的控制器。
车辆的动力系统可包括第一电池组,该第一电池组包含多个电池单元和与该电池单元电连接的开关元件。该动力系统也可包括第二电池组,该第二电池组与第一电池组隔开且包含与开关元件串联电连接的电阻器,以及设置用以检测指示与第一电池组关联的泄漏电流的电阻器两端电压的感应电路。
附图说明
图1为机动车辆的电池组和关联的绝缘检测电路的示意图。
图2为具有一套分布式电池组的另一动力车辆的方框图。
图3为图2的分布式电池组和关联的绝缘检测电路的示意图。
具体实施方式
按照要求,在此公开了本发明的详细实施方式;然而,应当理解的是,公开的实施方式仅为本发明的示例,其可以各种替代方式实施。附图不一定依比例绘制;一些特征可被放大或者缩小以显示特殊部件的细节。因此,公开于此的具体结构和功能的细节不应解释为限制,而仅仅作为教导本领域技术人员以不同的方式使用本发明的典型基础。
参见图1,机动车辆(图中未示出)的电池组10可包括设置在壳体20内的多个电池单元12a-12n(串联电连接),开关14、16(例如接触器等等),绝缘检测电路18,和感应电路19。开关14、16可闭合以使得电池单元12a-12n电连接于与高压总线关联的终端22、24。如本领域已知的,设置用以为车辆产生动力的电机可与这样的高压总线电连接。因此,电池单元12a-12n可提供为电机所消耗的电流。
绝缘检测电路18包括串联电连接在底盘接地和由电池单元12a与开关14之间的电连接限定的节点(此处称为节点A)之间的开关26、(串联限制)电阻器28、和(精密)电阻器30。该绝缘检测电路18也包括串联电连接在底盘接地和由在电池单元12n和开关16之间的电连接限定的节点(此处称为节点B)之间的开关32、(串联限制)电阻器34,、以及(精密)电阻器36。电阻器30、36的每一个的两端的电压与流过它们的电流成比例。
可通过打开开关26、闭合开关14、16、32以及测量电阻器36两端的电压来检测节点A处的电流泄漏。(也就是说,在节点B和底盘之间有意产生漏电阻(Ohmic leak),电阻器36两端生成的电压通过感应电路19测量。随后可用欧姆定律确定流过电阻器36的电流,其等于与节点A相关联的泄漏电流。)类似地,可通过打开开关32、闭合开关14、15、26以及测量电阻器30两端的电压来检测节点B处的电流泄漏。也可用其他技术和结构来检测单个电池组的电流泄漏。
参见图2,另一动力车辆38(例如电池动力车、混合动力车、插电式混合动力车等等)可包括电机40(例如电动机、电动机/发电机等等)、变速器42(例如动力分流的、机械的等等)、以及车轮44。安排电机40机械地驱动变速器42(如粗线表示),以及安排变速器42机械地驱动车轮44(如粗线表示)。如果车辆38为混合动力型汽车,其当然可包括发动机(图中未示出),该发动机也被安排选择性地机械驱动变速器42。其他安排也是可能的。
车辆38也可包括电池组46、48(或在特定安排中有更多电池组)以及分别设置在电池组46、48内的控制器50、51。该电池组46、48串联电连接在一起(如细线表示),电池组46与电机40电连接(如细线表示)。因此电池组46、48可提供为电机40所消耗的电流。在图2的例子中,电池组46、48被分布在整个车辆38中。也就是说,电池组46放置在车辆38内的特定位置(例如在车辆的驾驶室内),电池组48放置在车辆38内的不同位置(例如车辆的驾驶室下面)。这样的电池组安排可以用于较好地将电池单元装在车辆38内。在其他实例中,控制器50、51可与电池组46、48分离;该电池组46、48可并联电连接在一起;并且/或者电池组46、48的每一个可与电机40电连接。其他安排也是预期的。
电池组46与控制器50连通,或受控制器50的控制。电池组48与控制器51连通,或受控制器51的控制。控制器50、51互相连通(如虚线所示)。
电流泄漏可发生在电池组46、48的一个或两个内。因此,可能需要检测这种泄漏的存在。然而,在电池组46、48的每一个中仅仅提供类似于针对图1描述的绝缘检测电路可能是不实际的。例如在电池组46、48的每一个中提供类似于针对图1描述的感应电路可能花费过高。此外,协调如此安排的电池组的绝缘检查可能是困难的。正如下面更详细讨论的,电池组46、48可包括绝缘检测电路,该绝缘检测电路能够用位于中心的感应电路检测电流泄漏。
参见图3,电池组46可包括设置在壳体60内的控制器50、多个电池单元52a-52n(串联电连接)、开关54(例如接触器等等)、绝缘检测电路56和感应电路58。可闭合开关54使得电池单元和与高压总线(图中未示出)连接的终端61电连接。电机40(图2)也与该高压总线电连接。
绝缘检测电路56可包括串联电连接在底盘接地和由电池单元52a和开关54之间的电连接限定的节点(此处称为节点X)之间的开关62、(串联限制)电阻器64、和(精密)电阻器66。绝缘检测电路56还可包括串联电连接在底盘接地和由电池单元52n和电池单元74a之间的电连接限定的节点(此处称为节点Y)之间的开关68、(串联限制)电阻器70、和(精密)电阻器72。电阻器66、72的每一个的两端的电压与流过它们的电流成比例。
电池组48可包括设置在壳体78内的控制器51、多个电池单元74a-74n(串联电连接)和开关76。可闭合开关76以使得电池单元和终端80电连接,该终端80与以上描述的高压总线和电机40(图2)电连接。
绝缘检测电路82分布在电池组46和48之间。也就是说,在图3的例子中,绝缘检测电路82可包括设置在壳体78内的开关84和(串联限制)电阻器86,以及设置在壳体60内的(串联限制)电阻器88和(精密)电阻器90。因此,在此例子中恰好与电池组46相关联的位于中心的感应电路58可用于通过模数转换器检测电阻器66、72、90的任何一个两端的电压,其中模数转换器的参考节点与底盘接地相连接。这种转换器中常见的多路器电路随后可被用于在与电阻器66、72、90相关联的电压中选择。
开关84和电阻器86串联电连接在电阻器88和由电池单元74n和开关76之间的电连接限定的节点(此处称为节点Z)之间。电阻器88、90串联电连接在底盘接地和电阻器86之间。当与电阻器86、88关联的线路短路时,电阻器86、88阻止过多的电流流过它们。在其他例子中,电阻器86、88的任何一个可被省略。然而,这样的省略可导致热量或其他问题。
控制器50还可包括绝缘检测电路56,感应电路58,以及电阻器88、90。控制器51还可包括开关84和电阻器86。其他设置也是可预期的。
这种结构可与任何数量的电池组一起使用。也就是说,中心电池组可包括位于中心的感应电路和用于附属电池组的每一组的与底盘接地电连接的(精密)电阻器。类似于参照图3所描述的,(精密)电阻器的每一个随后可通过位于附属电池组和/或中心电池组内的一个或多个(串联限制)电阻器与位于相应的附属电池组内的开关电连接。其他的安排也是可能的。
控制器50、51可操作以确定绝缘检测电路56、82和感应电路58是否处于适当的工作状态:(a)可打开开关68,可闭合开关62、84,并且可测量电阻器66、90两端的电压和从节点X到节点Z的电压。然后,可根据(1)和(2)评价此信息:
Vpack-est=((V66/R66)*(R66+R64))+((V90/R90)*(R90+(R88+R86)))(1)
|Vpack-est-VXZ|≤α (2)
其中VXZ为节点X和Z之间的电压差,V66为电阻器66两端的电压,V90为电阻器90两端的电压,R64、R66、R86和R88分别为电阻器64、66、86和88的电阻,以及α为预定值;(b)可打开开关84,可闭合开关62、68,并且可测量电阻器66、72两端的电压和从节点X到节点Y的电压。然后,可根据(3)和(4)评价此信息:
V2pack-est=((V66/R66)*(R66+R64))+((V72/R72)*(R72+R70))(3)
|V2pack-est-VXY|≤β (4)
其中VXY为节点X和Y之间的电压差,V66为电阻器66两端的电压,V72为电阻器72两端的电压,R64、R66、R70和R72分别为电阻器64、66、70和72的电阻,以及β为预定值;以及(c)可打开开关62,可闭合开关68、84,并且可测量电阻器72、90两端的电压和从节点Y到节点Z的电压。然后,可根据(5)和(6)评价此信息:
V3pack-est=((V90/R90)*(R90+R88))+((V72/R72)*(R72+R70))(5)
|V3pack-est-VYZ|≤γ (6)
其中VYZ为节点Y和Z之间的电压差,V90为电阻器90两端的电压,V72为电阻器72两端的电压,R70、R72、R88和R90分别为电阻器70、72、88和90的电阻,以及γ为预定值。
如果(2)、(4)和(6)为真,那么绝缘检测电路56、82和感应电路58处于适当的工作状态。如果(2)、(4)和(6)中任何一个不为真,那么绝缘检测电路56、82或感应电路58未处于适当工作状态。
控制器50、51可执行从节点X到底盘的泄漏检查:可闭合开关84,可打开开关62、68,并且可测量电阻器90两端的电压V90和从节点X到节点Z的电压VXZ。然后,系统泄漏电阻Rleakx可表示为VXZ和V90的函数:
VXZ*(R90/(R90+R88+R86+Rleakx))=V90 (7)
其中R86、R88和R90分别为电阻器86、88、90的已知电阻。(7)可使用已知的技术重新安排以求解Rleakx。
控制器50、51可执行从节点Z到底盘的泄漏检查:可闭合开关62,可打开开关68、84,并且可测量电阻器66两端的电压V66和从节点X到节点Z的电压VXZ。然后,系统泄漏电阻Rleakz可表示为VXZ和V66的函数:
VXZ*[R66/(R66+R64+Rleakz)]=V66 (8)
其中R64和R66分别为电阻器64、66的已知电阻。(8)可使用已知的技术重新安排以求解Rleakz。
尽管典型实施例已如上说明,这些实施例并非意在描述本发明的所有可能的形式。此外,在说明书中使用的词语是描述性的词语而不是限制,并且可以理解的是,在不超出本发明精神和范围的情况下可做出各种改变。此外,各种实施实施例的特征可以结合以形成本发明的进一步的实施例。
Claims (5)
1.车辆的动力系统,其特征在于,包括:
第一电池组,该第一电池组包含多个电池单元和与所述电池单元电连接的开关元件;以及
第二电池组,所述第二电池组与所述第一电池组隔开,且包含(i)与所述开关元件串联电连接的电阻器,和(ii)设置用以检测指示与所述第一电池组关联的泄漏电流的电阻器两端电压的感应电路。
2.根据权利要求1所述的系统,其特征在于,电阻器为精密电阻器。
3.根据权利要求2所述的系统,其特征在于,第一电池组进一步包括电连接在所述开关元件和所述精密电阻器之间的串联限制电阻器。
4.根据权利要求2所述的系统,其特征在于,所述第二电池组进一步包括电连接在所述开关元件和所述精密电阻器之间的串联限制电阻器。
5.根据权利要求2所述的系统,其特征在于,所述第二电池组进一步包括另一精密电阻器,其中所述感应电路进一步被设置用以检测指示与所述第二电池组关联的泄漏电流的所述另一精密电阻器两端的电压。
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