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锂电池须要办理体系(BMS)吗?
3195 2022-07-04
    将几节锂电池串连起来便能够组成一个电池组,它既能够为各类负载供电,也能够用婚配的充电器遏制一般充电。锂电池不须要任何电池办理体系 (BMS)便能够充放电。那末为甚么市场上一切锂电池都加了BMS呢?谜底是宁静和寿命。
    电池办理体系BMS(Battery Management System)是用于监督和节制可充电电池的充电和放电。锂电池办理体系BMS最重要的功效是确保电池坚持在宁静操纵规模内,并在任何单个电池起头超越限定时当即采用步履。若是BMS监测到电压太低,它将断开负载,若是电压太高,则断开充电器。它还将查抄电池组中每一个电池的电压是不是不异,并下降任何高于其余电池的电压。这确保了电池不会达到危险的高电压或低电压——这凡是是咱们在消息中看到的锂电池动怒的缘由。它乃至能够监控电池的温度,并在电池组变得太热乃至着火前就断开电池组的毗连。以是,电池办理体系BMS是让电池遭到掩护,而不是纯洁依靠杰出的充电器或准确的用户操纵。
铅酸电池:
    为甚么铅酸电池(AGM、凝胶电池、深轮回等)不须要电池办理体系?铅酸电池的成份不那末易燃,若是充电或放电呈现题目,它们动怒的能够性要小很多。但首要缘由与电池布满电后的行动有关。铅酸蓄电池也是由电芯串连而成;若是一个电芯的充电量比其余电芯略多,在其余电芯完整布满电之前,它只会让电流经由进程,同时本身坚持公道的电压,等其余电芯遇上。经由进程这类体例,铅酸电池在充电时会“自我均衡”。
锂电池:
    锂电池则不一样。可充电锂电池的正极多为锂离子资料,它的任务道理决议了,在充放电进程中,锂电子会一次又一次地跑到正负极两侧。若是许可单体电芯的电压高于4.25v(高压锂电池除外),阳极微孔布局能够会瓦解,硬晶体物资能够会长大并激发短路,而后温度会敏捷降低,最初会致使火警。当锂电芯布满电时,电压会俄然降低,并且会很快达到危险程度。若是一个电池组中某个电芯的电压比其余电芯高,在充电进程中此电芯会领先达到危险电压,而此时电池组的全体电压还不达到布满值,充电器不会遏制充电。是以,领先达到危险电压的电芯会激发宁静危险。以是,节制和监测电池组的总电压对基于锂的化学物资是不够的,必须要由BMS来查抄组成该电池组的每一个零丁电芯的电压。
    从狭义下去讲,电池办理体系BMS是用于大电池组的掩护,典范用处是磷酸铁锂能源电池,具备过充、过放、过流、短路、电芯均衡等掩护功效。
    从狭义下去说,掩护电路板PCB(Protection Circuit Board),偶然也称为PCM(Protection Circuit Module),是属于简略单纯型的电池办理体系BMS。通经常利用于小电池组。典范用于数码电池,如手机电池,相机电池,GPS电池,加热衣服电池等。大大都时辰,它用于3.7V或7.4V电池组,它具备过充、过放、过流、短路四种根基功效。有些电池能够还须要PTC和NTC。
    是以,要想确保锂电池组宁静且利用寿命长,确切须要一个品质靠得住的电池办理体系BMS。

更多锂电池小常识,请存眷咱们的公家号:旋力电子

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