CN109075580B - 电池模块 - Google Patents
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Abstract
提供保障外部电源停止时的安全性的电池模块。实施方式的电池模块(10)具备:电池(BT);断路器(14),对从电池(BT)向外部的输出线的电连接进行切换;电源切换电路(12),接收从电池(BT)供给的内部电源电压(VLIB)、从外部电源(20)供给的外部电源电压(VEXT)、以及来自外部的启动信号(IG_in),在外部电源电压(VEXT)与启动信号(IG_in)中的至少一方为第2电平时,将供给电源电压的电源从外部电源(20)向电池(BT)切换;以及控制电路(16),利用从电源切换电路(12)输出的电源电压而启动,控制断路器(14)以及电源切换电路(12)的动作。
Description
技术领域
本发明的实施方式涉及电池模块。
背景技术
电池模块例如具备:蓄电池;控制电路,控制电池模块的动作;以及断路器,设置于来自蓄电池的输出线,对输出线的导通与断路进行切换。控制电路例如利用来自在搭载有电池模块的设备中搭载的电源(外部电源)的电力而动作,对蓄电池、断路器的动作进行控制。
电池模块在搭载于电动汽车、混合动力汽车等车辆的情况下,有时由于车辆的动作,来自车辆的电源供给变得不稳定。例如,在来自车辆的电源供给线、通信线断线时等,电池模块的控制电路不再被进行电源供给。另外,在车辆急起步时等,存在向电池模块的控制电路的电源供给瞬间停止的情况。
在断路器为通过流过电流而被导通(ON)的继电器或接触器等时,若不是一直通电则不能确保断路器的导通(ON)状态,因此导致消耗电流变大。并且,在断路器为通过流过电流而被导通(ON)的继电器或接触器等时,由于来自外部电源的电力供给瞬停,断路器成为断开(绝缘)的状态。因此,提出有具备用于保持对电池模块的断路器的控制信号的电位的电容的电池模块。
然而,附加的电容的大小也存在极限,若增大为了保持电位而附加的电容,则模块的外形变大,又变得难以较低地抑制制造成本。
现有技术文献
专利文献
专利文献1:日本特开2008-109517号公报
发明内容
发明所要解决的课题
另外,在断路器为利用单触发的脉冲来控制导通与绝缘的闩锁继电器等时,可以想到若从外部电源向电池模块的控制电路的电源供给停止则控制电路无法打开断路器的情况,最坏的情况可能造成短路等事故。
本发明的实施方式鉴于上述情况而做成,目的在于提供保障外部电源停止时的安全性的电池模块。
用于解决课题的手段
实施方式的电池模块具备:电池;断路器,对从所述电池向外部的输出线的电连接进行切换;电源切换电路,接收从所述电池供给的内部电源电压、从外部电源供给的外部电源电压及来自外部的启动信号,在所述外部电源电压与所述启动信号中的至少一方为第2电平时,将供给电源电压的电源从所述外部电源切换成所述电池;以及控制电路,将从所述电源切换电路输出的所述电源电压作为电源,控制所述断路器及所述电源切换电路的动作。
附图说明
图1为用于说明实施方式的电池模块的一构成例的框图。
图2为说明实施方式的电池模块的电源切换电路的构成的一例的图。
图3为说明实施方式的电池模块的控制电路以及电源切换电路的动作的一例的状态推移图。
具体实施方式
以下,参照附图对实施方式的电池模块进行说明。
图1为用于说明实施方式的电池模块的一构成例的框图。
本实施方式的电池模块10是与车辆负载30、作为外部电源的铅电池20电连接的直流负载。在本实施方式中,电池模块10例如搭载于电动车辆,车辆负载30具备未图示的逆变器以及马达(交流负载)。逆变器例如是双向的3相交流逆变器,将从电池模块10供给的直流电流转换为交流电流而向马达供给并且将来自马达的再生电流转换为直流电流而向电池模块10供给。马达利用从逆变器供给的交流电流而被驱动。由马达的旋转产生的动力经由未图示的车轴向车轮传递。
铅电池20向电池模块10供给电源电压VEXT和启动信号IG_in。电源电压VEXT是来自与电池模块10一直连接的铅电池20的信号,启动信号IG_in是由将搭载于电动车辆的设备控制成同步的上位控制装置(未图示)供给的信号。此外,启动信号IG_in也可以是电源电压VEXT与启动信号IG_in是相同的电源(信号)。
本实施方式的电池模块10具备电池BT、电源切换电路12、控制电路(CPU)16、以及断路器14。
电池BT具备未图示的多个二次电池单体(cell)。电池BT经由用于对作为从电池BT向外部的输出线的主电路的电连接进行切换的断路器14向外部输出电压VLIB。另外,电池BT的输出电压(内部电源电压)VLIB构成为能够对电源切换电路12供给。
断路器14是对主电路的连接进行电切换的切换单元。断路器14例如既可以是通过流过电流而导通的继电器或接触器等,也可以是通过单触发的脉冲而被控制导通与绝缘的动作的闩锁继电器。在本实施方式中,断路器14的动作由从电源切换电路12供给的电压VINT控制。
控制电路16例如是包括CPU(central processing unit)或MPU(microprocessing unit)等处理器、以及存储器的运算单元。从电源切换电路12对控制电路16供给5V的电压作为电源电压。控制电路16利用从电源切换电路12供给的信号IG_PWR_ON,判断从外部供给的电源(电压VEXT)的有无,切换向电源切换电路12的控制信号LIB_SD。控制电路16具备对信号IG_PWR_ON为L电平的时间进行计数的计数单元。
电源切换电路12向控制电路16供给电源电压(5V)并且向断路器14供给电压VINT,基于来自外部的启动信号IG_in切换从电池模块10向车辆负载30的电力的供给与停止。电源切换电路12被供给电池BT的输出电压VLIB、以及从电池模块10的外部(铅电池20)供给的电压VEXT。
在本实施方式中,电源切换电路12构成为,在来自外部的电源供给停止的情况下,能够不受控制电路16的控制地自主地将向控制电路16的电源供给源从外部电源切换成内部电源。由此,即使在来自外部电源的电源供给停止的情况下,也能够使控制电路16的动作继续,能够安全地使电池模块10停止。
图2为说明实施方式的电池模块的电源切换电路的构成的一例的图。
电源切换电路12具备多个开关元件TR1a~TR6、整流元件、电阻器、调节器Reg以及电容12C。
多个开关元件TR1a~TR6例如能够使用IGBT(Insulated Gate Bipolartransistor:绝缘栅双极型晶体管)或MOSFET(Metal oxide semiconductor FET:金属-氧化物半导体场效应晶体管)等晶体管。开关元件TR1a、TR1b例如为IGBT(Insulated GateBipolar transistor),开关元件TR2~TR6例如为MOSFET(Metal oxide semiconductorFET)。
开关元件TR1a的发射极接地,开关元件TR1a的集电极与开关元件TR1b的发射极电连接。经由以2V为阈值的稳压二极管对开关元件TR1a的基极施加启动信号IG_in。开关元件TR1a的发射极与基极经由电阻器而电连接。与开关元件TR1a的基极连接的二极管的阈值不限于2V,阈值也可以为可变。另外,二极管也可以省略。
开关元件TR1b与开关元件TR1a串联连接。开关元件TR1b的发射极与开关元件TR1a的集电极电连接。开关元件TR1b的集电极经由电阻器而与开关元件TR2~TR4的基极电连接。开关元件TR1B上并联连接有以从发射极向集电极的方向为正向的二极管。经由以6V为阈值的稳压二极管对开关元件TR1b的基极施加电压VEXT。开关元件TR1b的发射极与基极经由电阻器而电连接。与开关元件TR1b的基极连接的二极管的阈值不限于6V,阈值也可以为可变。另外,二极管也可以省略。
开关元件TR2的发射极与电压VINT的输出端子电连接,开关元件TR2的集电极经由以朝向集电极的输入方向为正向的二极管而与电压VEXT的输入端子电连接。开关元件TR2的基极经由电阻器而与开关元件TR1b的集电极电连接。在开关元件TR2的集电极与基极之间并联连接有电阻器、以及以从基极朝向集电极的方向为正向的稳压二极管。开关元件TR2上并联连接有以从开关元件TR2的发射极朝向集电极的方向为正向的二极管。
开关元件TR3的发射极接地,开关元件TR3的集电极经由电阻器而与5V的电源电压的输出端子电连接。5V的电源电压由后述的调节器Reg供给。开关元件TR3的基极经由电阻器而与开关元件TR1b的集电极电连接。开关元件TR3的基极与发射极经由电阻器而电连接。
另外,在开关元件TR3的集电极与5V的电源电压的输入端子之间电连接有控制电路16的信号IG_PWR_ON输入端子。即,信号IG_PWR_ON在启动信号IG_in与外部电源电压VEXT的双方被供给(为高(H)电平)时成为H电平,在启动信号IG_in与外部电源电压VEXT中的至少一方的供给停止(为低(L)电平)时成为L电平。
开关元件TR4的发射极与开关元件TR5的集电极电连接。开关元件TR4的集电极经由电阻器而与开关元件TR6的基极电连接。开关元件TR4的基极经由电阻器而与开关元件TR1b的集电极电连接。在开关元件TR4的发射极与基极之间并联连接有电阻器、以及以从发射极朝向基极的方向为正向的稳压二极管。开关元件TR4上并联连接有以从开关元件TR4的发射极朝向集电极的方向为正向的二极管。
开关元件TR5的发射极接地。开关元件TR5的集电极与开关元件TR4的发射极电连接。开关元件TR5的基极经由电阻器与控制信号LIB_SD的输出端子电连接。开关元件TR5的发射极与基极经由电阻器而电连接。
开关元件TR6的发射极与电压VINT的输出端子电连接,开关元件TR6的集电极经由以朝向集电极的输入方向为正向的二极管而与电压VLIB的输入端子电连接。开关元件TR6的基极经由电阻器与开关元件TR4的集电极电连接。在开关元件TR6的集电极与基极之间并联连接有电阻器、以及以从基极朝向集电极的方向为正向的稳压二极管。开关元件TR6上并联连接有以从开关元件TR6的发射极朝向集电极的为正向的二极管。
调节器Reg连接于开关元件TR6的集电极(漏极)与开关元件TR2的集电极(漏极)之间,转换为5V的电源电压而输出。
电容12C具备保持电压VINT的输出端子的两端的电位的电容器。在来自外部的电源电压VEXT的供给停止时,利用电容12C使输出电压VINT的值被保持一定期间。在本实施方式中,在来自外部的电源电压VEXT停止的情况下,切换成通过电池BT的电压VLIB向控制电路16供给电源所需的时间为大约1ms以内,因此电容12C只要将输出电压VINT保持大约1ms即可。此外,优选电容12C根据输出电压VINT的值、保持输出电压VINT的时间、断路器14的构成等而设定为适当的大小。
以下,对本实施方式的电池模块的动作的一例进行说明。
图3为说明实施方式的电池模块的控制电路以及电源切换电路的动作的一例的状态推移图。此外,在以下的说明中,例如将信号(或电压)的第1电平设为H电平,将第2电平设为L电平。
在电池模块10停止的状态(ST1)下,启动信号IG_in为断开(OFF)(L电平),电池模块10的输出电压VINT为0V。此时全部的开关元件TR1a~TR6断开。
若启动信号IG_in成为接通(ON)(H电平),则开始外部电源电压VEXT的供给,VEXT成为接通(H)电平。由此,开关元件TR1a、TR1b、TR2成为导通的状态,电池模块10的输出电压VINT与外部电源电压VEXT相等、为H电平,调节器Reg被供给电压VEXT(ST2)。
调节器Reg若被供给H电平的电压则启动,输出5V的电源电压,作为电源向控制电路16进行供给。控制电路16利用5V的电源电压而启动。另外,输出电压VINT与外部电源电压VEXT相等、为H电平,将断路器14连接(接通)。控制电路16将向电源切换电路12的控制信号LIB_SD设为H电平,启动处理结束(ST3)。
如上述那样,控制信号LIB_SD由控制电路16进行H电平与L电平的切换。此外,控制电路16将控制信号LIB_SD从H电平向L电平切换,将电池模块10的电源从接通向断开切换。即,在电池模块10启动,并进行稳态运行时,利用控制电路16将控制信号LIB_SD设定为H电平。控制电路16为了电压VEXT(或启动信号IG_in)成为低电平时,而预先进行将控制信号LIB_SD设为H电平、将电池BT的输出电压VLIB向控制电路16供给的准备。在电池模块10停止(将电池模块10内的电源设为断开)时,由控制电路16将控制信号LIB_SD设定为L电平。
在使电源供给电路12停止(将电源断开)时,若电压VEXT(或启动信号IG_in)为低电平且通过基于CAN/LIN等通信协议的通信接收到来自上位控制装置的停止命令,则通过控制信号LIB_SD成为L电平来停止从电池BT向控制电路16的输出电压VLIB的供给。
若控制信号LIB_SD成为H电平,则电源切换电路12的开关元件TR5成为接通的状态,电池模块10成为被从作为外部电源的铅电池20供给电源的状态,且为向车辆负载30输出电池BT的电压VLIB的稳态状态(ST4)。在上述稳态状态下,控制电路16以规定的定时对来自电源切换电路12的信号IG_PWR_ON进行取样并监视,以监视来自铅电池20的电源供给的有无。
电源切换电路12在ST4中,在信号IG_PWR_ON为H电平(启动信号IG_in与外部电源电压VEXT双方为H电平)时,电源切换电路12使上述稳态运行继续。
启动信号IG_in与外部电源电压VEXT中的至少一方为L电平(信号IG_PWR_ON为L电平)时,为来自铅电池20的电源供给停止的状态。电源切换电路12在ST4中,在启动信号IG_in或者外部电源电压VEXT中的至少一方为L电平时,将向控制电路16的电源供给从作为外部电源的铅电池20切换成作为内部电源的电池BT。
如上述那样,将向控制电路16的电源供给从来自铅电池20的电压VEXT向电池VLIB切换的电源切换电路12的动作是通过控制信号LIB_SD预先成为H电平而(不受控制电路16的控制地)通过电源切换电路12自主地进行的。即,在本实施方式中,仅通过电源切换电路12的动作来切换向控制电路16的电源供给源,因此能够缩短切换所需要的时间,消除对控制电路16带来的影响(电源停止等)。因此,控制电路16能够不停止地继续电池模块10的控制。此外,此时,控制电路16所做的只是监视来自铅电池20的电源供给的有无。在将向控制电路16的电源供给从电池BT向铅电池20切换时,进行控制电路16的控制。
即,启动信号IG_in为L电平时或者外部电源电压VEXT为L电平时,开关元件TR2成为断开,开关元件TR3和开关元件TR4成为接通。由此,进而开关元件TR6成为接通。在该状态下,电压VINT与内部电源电压VLIB相等,从电池BT对调节器Reg供给电压VLIB。此外,在本实施方式中,电源切换电路12如上述那样将向控制电路16供给电源电压的电源从作为外部电源的铅电池20切换为作为内部电源的电池BT的动作是在1ms以内进行的(ST5)。
此外,在ST5~ST7中,在信号IG_PWR_ON为L电平(启动信号IG_in=L)时,当从未图示的上位控制装置向控制电路16基于CAN/LIN等通信协议接收到了使电池模块10停止的命令时,控制电路16开始电池模块的停止处理,将断路器14断开。控制电路16在全部的停止处理结束后,将控制信号LIB_SD设为L电平,将电源切换电路12的开关元件TR5设为断开并将开关元件TR4和开关元件TR6设为断开来停止电源供给(停止调节器Reg)。接着,开关元件TR3成为断开(ST1)。
控制电路16在信号IG_PWR_ON成为L电平时,开始计数,判断来自铅电池20的电源供给停止的期间是否为规定的阈值以上。在本实施方式中,控制电路16判断信号IG_PWR_ON为L电平的期间、即启动信号IG_in与外部电源电压VEXT中的至少一方为L电平的期间是否为10秒以上(ST6)。
控制电路16监视信号IG_PWR_ON,至经过规定的阈值为止,在信号IG_PWR_ON为L电平的期间,从电池BT向控制电路16继续电源供给(ST5)。
在规定的阈值以内信号IG_PWR_ON成为H电平时,启动信号IG_in与外部电源电压VEXT双方为H电平,控制电路16将控制信号LIB_SD切换为L电平。由此,在电源切换电路12中,将向控制电路16供给电源电压的电源从电池BT向铅电池20切换(ST4)。此时,通过控制信号LIB_SD成为L电平,虽然从电池BT向电源切换电路12的电源供给停止,但由于确保了来自铅电池20的电压VEXT,因此输出电压VINT被保持。此外,控制信号LIB_SD在电池模块10的启动时成为L电平。控制电路16刚启动后,控制电路16的IO端口为H-Zi(无信号),因此为L电平。控制电路16在稳态运行开始时将控制信号LIB_SD设为H电平,以后至完全停止或者VEXT(IG_in)得以确保为止维持H电平。
此外,控制电路16在从电池BT供给电源电压的期间,监视电源电压的值(或电池BT的电压),判断电池BT的电压是否为放电终止电压以下(ST7)。
在ST6中,控制电路16监视信号IG_PWR_ON,在信号IG_PWR_ON为L电平的期间超过了规定的阈值时,以及在从电池BT供给电源电压时电池BT的电压成为放电终止电压以下时,进行停止处理(ST8)。在停止处理中,控制电路16开始电池模块10的停止处理,将断路器14断开。即,控制电路16将控制信号LIB_SD设为L电平,将开关元件TR5设为断开并将开关元件TR4及开关元件TR6设为断开来停止调节器Reg,将开关元件TR3设为断开来停止向控制电路16的电源供给。
如上述那样,在本实施方式的电池模块10中,仅利用电源切换电路12的动作来将向控制电路16的电源电压的供给在外部电源与内部电源之间切换。由此,在来自外部电源的电源供给停止时,也能够使控制电路16的动作继续。
例如,在断路器14为通过流过电流而导通(ON)的继电器或接触器等时,来自外部电源的电力供给瞬停会使断路器14成为打开(绝缘)状态。另外,利用电流而接通的断路器14若未一直通电则不能确保导通(ON)状态,因此消耗电流变大。
例如,在断路器14为利用单触发的脉冲来控制导通与绝缘的闩锁继电器等时,在上位装置侧的电源(外部电源)或控制线路、通信线断线时,会成为断路器14维持着导通(ON)或绝缘(OFF)而不能被控制的状态。在断路器14为导通(ON)的状态下,电池模块的输出端子成为保持带电状态,非常危险。
在本实施方式的电池模块10中,如上述那样,即使在来自外部电源的电源供给停止时,向控制电路16的电源供给也不会停止,因此控制电路16能够进行断路器14的控制,能够将断路器14断开后安全地停止电池模块10的动作。
另外,在本实施方式的电池模块10中,在来自外部电源的电力供给为暂时的供给的情况下,能够以将向控制电路16供给电源电压的电源从内部电源返回到外部电源的方式进行切换。由此,能够抑制内部电源中积蓄的电力被消耗。
并且,在本实施方式的电池模块10中,在控制电路16利用内部电源(VLIB)而动作时,为了防止电池BT过放电而监视电池BT的电压,在电池BT的电压成为放电终止电压以下时,能够自己停止电池模块10的动作(ST8),停止输出电压VINT(设为0)。
如上述那样,根据本实施方式,能够提供保障外部电源停止时的安全性的电池模块。
虽然说明了本发明的几种实施方式,但这些实施方式作为例子进行提示,无意限定发明的范围。这些新的实施方式能够以其他的各种形态实施,在不脱离发明的主旨的范围内,能够进行各种的省略、置换、变更。这些实施方式及其变形包含于发明的范围及主旨,并且也包含于权利要求书所记载的发明及其等同的范围。
此外,在上述实施方式中,将信号的第1电平设为H(高)电平,将第2电平设为L(低)电平进行了说明,但不限于上述情况。根据电源切换电路的构成,也可以将第1电平设为L电平将第2电平设为高电平。
附图标记说明
10…电池模块,12…电源切换电路,12C…电容,14…断路器,16…控制电路,20…铅电池(外部电源),30…车辆负载,TR1a~TR6…开关元件,BT…电池(内部电源)。
Claims (5)
1.一种电池模块,其中,具备:
电池;
断路器,对从所述电池向外部的输出线的电连接进行切换;
电源切换电路,接收从所述电池供给的内部电源电压、从外部电源供给的外部电源电压及来自外部的启动信号,在所述外部电源电压与所述启动信号中的至少一方为第2电平时,将供给电源电压的电源从所述外部电源切换成所述电池;以及
控制电路,将从所述电源切换电路输出的所述电源电压作为电源,控制所述断路器及所述电源切换电路的动作,
所述控制电路在所述外部电源电压或所述启动信号为第2电平的期间超过规定的阈值时,将所述断路器断开,停止所述电源电压的供给。
2.如权利要求1所述的电池模块,其中,
所述控制电路在所述外部电源电压或所述启动信号为第2电平的期间,在所述电池的电压成为放电终止电压以下时,将所述断路器断开,停止所述电源电压的供给。
3.如权利要求1所述的电池模块,其中,
在启动后,在所述启动信号成为第2电平且接收到停止命令时,所述控制电路将所述断路器断开,停止所述电源电压的供给。
4.如权利要求1所述的电池模块,其中,
所述电源切换电路具备电容,该电容能够将用于切换所述断路器的电压保持规定期间。
5.如权利要求1所述的电池模块,其中,
所述控制电路在所述外部电源电压或所述启动信号为第2电平的期间,在所述外部电源电压及所述启动信号成为第1电平时,控制所述电源切换电路,将供给所述电源电压的电源从所述电池切换成所述外部电源。
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