CN116683554A - 用于测量电池单元电压的电路及其控制方法 - Google Patents
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Abstract
本公开涉及用于测量电池单元电压的电路及其控制方法。该电路包括:多个电池单元,包括在电池组中;测量电池单元电压的装置;保护电路,并联连接至测量电池单元电压的装置的每个端子;以及外部电源,向保护电路施加电力。
Description
技术领域
本公开的实施例涉及用于测量电池单元电压的电路及其控制方法,并且更具体地,涉及可以防止在电池单元(battery cell)中发生反向电压时对测量电池单元电压的装置的损坏的用于测量电池单元电压的电路及其控制方法。
背景技术
通常,电动车辆(EV)或混合动力电动车辆(HEV)可以通过使用电池(包括燃料电池或氢电池)来驱动电动马达。
因此需要测量(或监测)电池(包括燃料电池或氢电池)中的每个单元(cell)的电压以用于电压控制(例如,用于使单元之间的电压差最小化的电压平衡控制)。该方法可以防止电池的过压或者欠压,使得电池安全寿命长。
这里使用的用于测量电池单元电压的电路通常可以包括:多路复用器(MUX),用于选择多个电池单元中的一个;以及模数转换器(ADC),将通过多路复用器(MUX)输出的值转换为数字值(参见图1至图3)。
这里,包括MUX的测量电池单元电压的装置(例如,BMS感测IC)可以包括感测零至5V的恒定电压的一个感测通道。
然而,在(尤其是氢电池的)电池单元中可能异常地发生反向电压。在这种情况下,用于测量电池单元电压的常规电路不包括对应于反向电压的保护电路,并且因此在测量电池单元电压的装置(例如,BMS感测IC)中可能发生火灾损坏。当反向电压继续时,电池单元也可能被损坏。
例如,安装在电动车辆中的电池可以包括彼此串联堆叠的多个单元。因此,用于测量电池单元电压的电路(或电池管理系统(BMS))可以包括测量几十个电池单元电压以监控电池单元的装置(例如,BMS感测IC)。因此,当发生反向电压以对测量特定电池单元电压的装置造成火灾损坏时,可能需要更换整个BMS。此外,由于即使在仅一个单元被损坏时也需要更换整个电池,所以可能会招致巨大的成本。
因此,需要一种用于测量电池单元电压的电路,该电路包括用于防止用于测量电池单元电压的电路(或BMS)中的电池单元在电池单元中异常地发生反向电压时由于反向电压而烧毁的保护电路。
在韩国专利第10-1527136号(在2015年6月2日登记并且名称为“用于诊断电动车辆的电池的装置及其方法(APPARATUS FOR DIAGNOSING BATTERY OF ELECTRIC VEHICLEAND METHOD THEREOF)”)中公开了本公开的背景技术。
发明内容
各个实施例涉及可以防止在电池单元中发生反向电压时对测量电池单元电压的装置的损坏的用于测量电池单元电压的电路及其控制方法。
在实施例中,用于测量电池单元电压的电路包括:多个电池单元,包括在电池组中;测量电池单元电压的装置;保护电路,并联连接至测量电池单元电压的装置的每个端子;以及外部电源,向保护电路施加电力。
保护电路可以包括串联连接至电阻器(RPU)的二极管(DPU)。
在保护电路中,二极管(DPU)的阳极可以通过测量电池单元电压的装置的电源端子(VPU)连接至外部电源的阳极。
在保护电路中,二极管(DPU)的阴极可以连接至电阻器(RPU)的一端,并且电阻器(RPU)的另一端可以连接至测量电池单元电压的装置的每个端子(VC0、VC1或VC2)。
在电池组中,最下面的电池单元的阴极可以共同连接至外部电源的阴极和测量电池单元电压的装置的接地端子(GND)。
在电池组中,最下面的电池单元的阴极可以通过底部电阻器(RBOTTOM)和与底部电阻器(RBOTTOM)并联连接的底部二极管(DBOTTOM)共同连接至外部电源的阴极和测量电池单元电压的装置的接地端子(GND)。
底部电阻器(RBOTTOM)的一端可以连接至底部二极管(DBOTTOM)的阴极和电池组中的最下面的电池单元的阴极,并且底部电阻器(RBOTTOM)的另一端可以共同连接至底部二极管(DBOTTOM)的阳极、外部电源的阴极和测量电池单元电压的装置的接地端子(GND)。
在测量电池单元电压的装置中,每个电池单元的每个端子(VC0、VC1或VC2)和阴极可以通过电阻器(RPU)彼此串联连接,并且电容器(CF)可以并联连接在每个端子(VC0、VC1或VC2)与每个电阻器(RPU)之间。
在另一实施例中,用于测量电池单元电压的电路的控制方法包括:通过控制器感测在电池的电池单元中发生反向电压;当感测到在电池单元中发生反向电压时,通过控制器输出反向电压感测信号并且将该反向电压感测信号发送至用于将氢充入至电池单元的高级系统(higher system);通过控制器检查电池单元的反向电压是否被解析;以及当电池单元的反向电压被解析时,停止输出反向电压感测信号。
电池可以包括氢单元,并且当高级系统响应于反向电压感测信号将氢充入至电池中时,可以解析电池单元的反向电压。
如上所述,根据本公开的实施例,可以防止在电池单元中发生反向电压时对测量电池单元电压的装置和电池单元自身的火灾损坏。
附图说明
图1是示出用于测量电池单元电压的通用电路的示意性配置的示例性示图。
图2是示出根据本公开的实施例的包括保护电路的用于测量电池单元电压的电路的示意性配置的示例性示图。
图3是用于说明在图2的电路中发生反向电压时测量电池单元电压的操作的示例性示图。
图4是用于说明在图3的电池单元中发生反向电压时控制器(或微控制器(MCU))的操作的流程图。
具体实施方式
在下文中,以下将参考所附附图通过各种实施例描述用于测量电池单元电压的电路及其控制方法。
应注意,为了清楚和方便解释,附图可以在线的厚度或部件的尺寸方面放大。此外,下面描述的术语是考虑到本公开中的功能而定义的术语,并且可以通过用户、操作者或实践的意图以不同的方式解释。因此,术语的定义应基于整个说明书的内容进行。
图1是示出用于测量电池单元电压的通用电路的示意性配置的示例性示图。如图1所示,用于测量电池单元电压的常规通用电路可以包括:测量电池组的多个电池单元(例如,CELL1、CELL2和CELL3)的电压的装置(例如,BMS感测IC);测量电池单元电压的装置(例如,BMS感测IC)的每个端子(VC0、VC1或VC2)和每个电池单元的阴极可以通过电阻器(RF)彼此串联连接;电容器CF可以并联连接在每个端子(VC0、VC1或VC2)与每个电阻器(RF)之间;并且测量电池单元电压的装置(例如,BMS感测IC)的接地端子(GND)和电池组的最下面的电池单元(例如,CELL1)的阴极可以共同彼此连接。
这里,在(尤其是氢电池的)任何一个电池单元(例如,CELL2)中可以异常地发生反向电压。在这种情况下,通过连接至电池单元(例如,CELL2)的阳极(或串联连接的上部电池单元(CELL3)的阴极)的端子VC2,在测量电池单元电压的装置(例如,BMS感测IC)中可能发生火灾损坏。当反向电压继续时,电池单元(例如,CELL2)也可能被损坏。
因此,需要用于测量电池单元电压的电路,该电路包括用于防止对测量电池单元电压的装置和电池单元的火灾损坏的保护电路。
图2是示出根据本公开的实施例的包括保护电路的用于测量电池单元电压的电路的示意性配置的示例性示图。
图2示出了在图1的电路中,包括与电阻器(RPU)串联连接的二极管(DPU)的保护电路可以与测量电池单元电压的装置(例如,BMS感测IC)的每个端子(VC0、VC1或VC2)并联连接。
在保护电路中,二极管(DPU)的阳极可以通过测量电池单元电压的装置(例如,BMS感测IC)的电源端子(VPU)连接至外部电源110的阳极;二极管(DPU)的阴极可以连接至电阻器(RPU)的一端;每个电阻器(RPU)的另一端可以连接至测量电池单元电压的装置(例如,BMS感测IC)的每个端子(VC0、VC1或VC2);并且电池组中的最下面的电池单元(CELL1)的阴极可以通过底部电阻器(RBOTTOM)和与底部电阻器(RBOTTOM)和并联连接的底部二极管(DBOTTOM)共同连接至外部电源110的阴极和测量电池单元电压的装置(例如,BMS感测IC)的接地端子(GND)。
更具体地,底部电阻器(RBOTTOM)的一端和底部二极管(DBOTTOM)的阴极可以连接至电池组的最下面的电池单元(CELL1)的阴极,并且底部电阻器(RBOTTOM)的另一端和底部二极管(DBOTTOM)的阳极可以共同连接至外部电源110的阴极和测量电池单元电压的装置(例如,BMS感测IC)的接地端子GND。
这里,从外部电源110供应的电压可以小于或等于电池单元电压(例如,5V),并且可以从其供应最小电流(例如,几μA)。
例如,可以假设在图2中的电池单元中的一个(例如,CELL2)中发生反向电压。例如,在CELL2中可以发生诸如CELL1=2V和CELL2=-4V的反向电压,并且在这种情况下,响应于其可以向测量电池单元电压的装置(例如,BMS感测IC)的端子(例如,VC2)施加负电压。以这种方式,可以向多路复用器(MUX)施加负电压,并且在这种情况下,在包括在MUX中的装置中可能发生火灾损坏,从而使得相应通道的正常操作是不可能的。此外,当如在电池单元中那样持续留下反向电压时,电池单元(例如,CELL2)也可能被损坏。
这里,在本实施例中,测量电池单元电压的装置(例如,BMS感测IC)的端子(例如,VC2)的电位可以低于当向端子(例如,VC2)施加负电压时连接至外部电源110的电源端子(VPU)的电位。因此,上拉电流可以沿着黄色路径(即,外部电源110的阳极→电源端子(VPU)→保护电路→发生反向电压的电池单元(CELL2)→电池组的最下面的电池单元(CELL1)→底部电阻器(RBOTTOM)→外部电源110的阴极)流动,从而使测量电池单元电压的装置(例如,BMS感测IC)的每个端子(VC0、VC1或VC2)的电位增加输入电流(IPU)×底部电阻(RBOTTOM)。
因此,测量发生反向电压的电池单元(例如,CELL2)的电压的端子(VC2)的电位可以增加并且改变为正电压,从而保护测量电池单元电压的装置(例如,BMS感测IC)以防止对其的损坏。
这里,从外部电源110供应的电流可能非常小(例如,几μA),并且对电池单元电压测量值的影响可能不是显而易见的。此外,本实施例中的电池单元电压可以通过测量连接至电池组的每个电池单元的相对电压来获得,因此测量电池单元电压的装置(例如,BMS感测IC)的每个端子(VC0、VC1或VC2)的电位可能同样增加,并且因此每个电池单元的相对电压不会改变。
图3是用于说明在图2的电路中发生反向电压时测量电池单元电压的操作的示例性示图。这里,电池单元电压可以以这样的方式监控:发生反向电压的电池单元(例如,CELL2)的电压由通过保护电路施加的电流改变为正电压,通过测量电池单元电压的装置(例如,BMS感测IC)测量的正电压通过MUX传输至模数转换器(ADC),并且通过ADC转换为数字值的电池单元电压测量值通常施加至控制器(或微控制器(MCU))。
因此,控制器(或MCU)可以基于电池单元电压控制(例如,输出警报信号)发生反向电压的电池单元(例如,CELL2)变为具有恒定电压(参见图4)。
图4是用于说明在图3的电池单元中发生反向电压时控制器(或微控制器(MCU))的操作的流程图。可以感测电池单元的反向电压(在S101中为是),并且在这种情况下,控制器(MCU)可以输出反向电压感测信号(或警报信号)并且将其传输至高级系统(例如,充氢系统,未示出)(S102)。
这里,当电池包括氢单元时,高级系统(例如,充氢系统,未示出)可以是用于将氢充入(或注入)到电池中的系统。当接收反向电压感测信号(或警报信号)的高级系统(例如,充氢系统,未示出)将氢充入到电池中时,可以解析反向电压。
因此,控制器(MCU)可以输出反向电压感测信号(或警报信号)直至电池单元的反向电压被解析(S103中为否),并且当电池单元的反向电压被解析(S103中的是)时停止输出反向电压感测信号(或警报信号)。
因此,根据该实施例的电路可以防止发生反向电压的电池单元暴露于反向电压情况,从而防止对测量电池单元电压的装置和电池单元自身的火灾损坏。
如上所述,已经参考附图中示出的实施例描述了本公开。然而,这些实施例仅是示例,并且本公开所属领域的技术人员将理解,各种修改和其他等效实施例是可能的。因此,本公开的技术范围应由所附权利要求限定。此外,本文描述的实现方式可以例如以方法或过程、设备、软件程序、数据流或信号实现。虽然仅以单个形式(例如,仅作为方法)公开实现方式,但是所公开的特征的实现方式也可以以另一形式(例如,作为设备或程序)实现。该设备可以以合适的硬件、软件、固件等实现。例如,该方法可以以设备(诸如通常指计算机的处理器、微处理器、包括集成电路的处理装置、可编程逻辑装置等)等实现。处理器还可以包括促进终端用户之间的信息的通信的通信装置,诸如计算机、移动电话、便携式/个人数字助理(“PDA”)、另一装置等。
Claims (10)
1.一种用于测量电池单元电压的电路,所述电路包括:
多个电池单元,包括在电池组中;
测量电池单元电压的装置;
保护电路,并联连接至测量电池单元电压的所述装置的每个端子;以及
外部电源,被配置为向所述保护电路施加电力。
2.根据权利要求1所述的电路,其中,所述保护电路包括串联连接至电阻器(RPU)的二极管(DPU)。
3.根据权利要求2所述的电路,其中,在所述保护电路中,所述二极管(DPU)的阳极通过测量电池单元电压的所述装置的电源端子(VPU)连接至所述外部电源的阳极。
4.根据权利要求3所述的电路,其中,在所述保护电路中,所述二极管(DPU)的阴极连接至所述电阻器(RPU)的一端,并且所述电阻器(RPU)的另一端连接至测量电池单元电压的所述装置的每个端子(VC0、VC1或VC2)。
5.根据权利要求1所述的电路,其中,在所述电池组中,最下面的电池单元的阴极共同连接至所述外部电源的阴极和测量电池单元电压的所述装置的接地端子(GND)。
6.根据权利要求5所述的电路,其中,在所述电池组中,所述最下面的电池单元的所述阴极通过底部电阻器(RBOTTOM)和与所述底部电阻器(RBOTTOM)并联连接的底部二极管(DBOTTOM)共同连接至所述外部电源的所述阴极和测量电池单元电压的所述装置的所述接地端子(GND)。
7.根据权利要求6所述的电路,其中,所述底部电阻器(RBOTTOM)的一端连接至所述底部二极管(DBOTTOM)的阴极和所述电池组中的所述最下面的电池单元的所述阴极,并且所述底部电阻器(RBOTTOM)的另一端共同连接至所述底部二极管(DBOTTOM)的阳极、所述外部电源的所述阴极、以及测量电池单元电压的所述装置的所述接地端子(GND)。
8.根据权利要求1所述的电路,其中,在测量电池单元电压的所述装置中,
每个电池单元的每个端子(VC0、VC1或VC2)和阴极通过电阻器(RPU)彼此串联连接,并且
电容器(CF)并联连接在每个端子(VC0、VC1或VC2)与每个电阻器(RPU)之间。
9.一种用于测量电池单元电压的电路的控制方法,所述方法包括以下步骤:
通过控制器感测在电池的电池单元中发生反向电压;
当感测到在所述电池单元中发生所述反向电压时,通过所述控制器输出反向电压感测信号并且将所述反向电压感测信号发送至用于将氢充入至所述电池单元的高级系统;
通过所述控制器检查所述电池单元的所述反向电压是否被解析;以及
当所述电池单元的所述反向电压被解析时,通过所述控制器停止输出所述反向电压感测信号。
10.根据权利要求9所述的方法,其中,所述电池包括氢单元,并且当所述高级系统响应于所述反向电压感测信号将氢充入至所述电池中时,所述电池单元的所述反向电压被解析。
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