【应用】额定电流60A螺栓固定式保险丝142.5631.5602应用于动力电池组过流保护,电气安装、更换非常简便
笔者研发一款14串5并动力电池组, 主要应用智能安防、环境监控系统设备备用动力电池,可实现联网远程集中实时监控。同时为了保护终端储存重要数据的应用绝对安全。内置电池管理系统除了采用多级保护控制电路还必须加入大电流快速熔断保险丝。以保护终端产品不会产生爆燃起火异常,保证终端持久使用更安全高效。
电池保护采用电池电量计设计,原电池保护板除了基本过充电流和过放电流保护, 加入主动均衡电路和二次短路保护过流保险丝,考虑到锂电池组内置18650电芯达到70个,如果没有快速熔断特保险丝,瞬间短路电流会导致电芯OCV下降,使每一组电池OCV不平衡,出现无法充电或者无法充满电异常,使电池循环使用寿命下降而导致整个电池组报废,同时保护电池管理模块集成微控制器和精密运放芯片不易损坏。由于电池长时间不间断应用在恶劣环境,或者为了在瞬间大电流迫使保险丝熔断后更换更方便,设计时最终选用螺栓固定式保险丝。由于LITTELFUSE(力特)低压保险丝能实现大电流快速熔断特性应用优势,选用 58V额定电压的BF1螺栓固定式保险丝142.5631.5602,额定电流为60A,其独特螺栓固定式设计可提供非常高电流线路保护,无论电气安装和更换都非常简便。满足智能安防、环境监控系统设备备用动力电池二次保护应用需求。
图1: 螺栓固定式保险丝142.5631.5602 用于动力电池组过流保护
螺栓固定式保险丝组装
首先将PCBA放在专用固定工装夹具内,将保险丝放在固定安装孔上,然后将带有弹压垫的平头螺丝M5X8 进行锁定紧固。安装为了保证金属触点通流能力,该螺丝材质表面处理采用Cr3黄锌工艺和防松涂覆紧固,安装时需要调节好电动螺丝批扭力力矩,保证不要出现滑牙现象而导致出现接触不良异常。在进行功能测试或者使用者误操作而导致更换保险丝,螺栓紧固端拆卸更换保险丝更快捷。
图2: 螺栓固定式保险丝安装紧固
Littelfuse(力特) 保险丝采用更人性化设计,可视透明卡箍采用PES塑料材质,高透明度便于发现保险丝是否为通路或者熔断状态。如果安装时成品需要查看保险丝是否为熔断状态,透明卡箍可以统一向顶部正面安装即可。
图3: 螺栓固定式保险丝实物产品
Littelfuse(力特) BF1保险丝采用不同颜色材质代表不同额定电流值,型号142.5631.5602颜色为黄色,额定电压58V,紧固端子采用抗氧化耐热铜合金,保证60A通流能力精度,使端子导通性更可靠。如果超过该保险丝负荷电流和额定电压,具有快速熔断特性 ,安全稳定性极高。避免引起烧毁外围元器件,保护主要元器件不被击穿。 产品封装采用耐温PET-GF30塑封材料,使塑封表面没有出现浮纤现象,保证产品外观高光泽度。即使在-40~+125℃工作环境温度范围内能保证其精度可靠性工作,该保险丝已经取得低压熔断器UL 248认证许可。
Littelfuse(力特)专业制造螺栓固定式保险丝, 推出BF1保险丝142.5631.5602,适用于动力电池(电源)保护电路应用。目前已经成功应用在动力电池组二次过流短路保护,保障终端高可靠性运行。
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