CN113514197B - 一种基于累积测试的车用电池pack包检漏系统和检测方法 - Google Patents
一种基于累积测试的车用电池pack包检漏系统和检测方法 Download PDFInfo
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Abstract
本发明公开了一种基于示踪气体累积法测试的车用电池PACK包密封性测试系统,包括累积测试腔体、气体搅拌系统、PACK包体混气充注系统、测试分析系统等;本发明还公开了一种示踪气体累积法测试的PACK包密封性能测试方法,所述方法可以在大气压下对电池PACK包进行密封性能测试,以符合IP67、IP68相应的密封等级要求。该方法既解决了传统气检法测量由于测量精度不够,无法满足IP67、IP68的测试要求,又解决了传统真空氦检法对电池PACK内电芯的损伤难题。
Description
技术领域
本发明涉及电池氦检技术领域,尤其涉及一种基于累积测试的车用电池PACK包检漏系统和检测方法。
背景技术
随着新能源车的快速发展,对PACK包的防水防护要求越来越高,提出了IP67,甚至IP68的防护要求。传统的气检法,由于受环境温度变化、PACK体积变化等诸多因素影响,已经远远不能满足该检测要求。市场需要一种更高精度的检测方法来实现可靠的IP67、IP68所对应的防水等级测试。
氦气属于极度活跃的气体分子,容易从微小细处逸散,为了检测工件的密封性,工业上常用氦气作为示踪气体,在真空箱内对工件进行质谱测试,快速实现高精度的漏率测量。该方法被称为箱式真空氦检。
但由于该方法需要在真空下进行,但电池PACK包易变形,不能承受较大的内外压差,这就需要PACK包体内外具备同步真空的能力,使得内外压差保持在设计范围内。
但这又带来新的问题,若PACK包体内处于真空状态,将使PACK内的电芯置于真空状态,电芯在压力差的作用下,开始膨胀,这将破坏电芯的安全间隙,严重危及PACK包的安全。
发明内容
为了克服上述不足,本发明提出了一种基于累积测试的车用电池PACK包检漏系统。
本发明提出的基于累积测试的车用电池PACK包检漏系统,包括PACK包体混气充注系统、累积测试腔体、气体搅拌系统、测试分析系统等;
所述PACK包体混气充注系统,包括抽空部件(如真空泵),注气部件,压力监控单元,和浓度监控部件等。作用是向PACK内部充注一定量的示踪气体,如氦气、氢气等。并且由于PACK包的内容积较大,且内部结构复杂,该系统需要保证注入的示踪气体浓度在PACK包内均匀分布。完成混气充注后PACK包的内部压力大于累积测试腔体内的压力,且示踪气体分布均匀。该系统也可以成为独立系统,与测试系统分离。
所述气体搅拌系统,由至少一组搅拌风扇按特定位置分布,以特定频率和方式开启。其位置分布和开启频率可根据不同的箱体形状调整。是为了快速实现泄漏后的示踪气体在累积测试腔体内的均匀分布。所述搅拌风扇,以一定的数量,以一定的分布,排布在累积测试腔体内部,搅动累积测试腔体内的空气加速混合。
所述累积测试腔体,是进行气体搅拌和累积测试的密闭容器,并设有开关门机构,以供PACK包的进出;上部设置有清氦排气口;底部设置有设备架台;累积测试腔体与PACK包的防水透气孔通过软管对接。完成示踪气体混气充注后PACK包,进入该累积测试腔体后,腔门关闭,气体搅拌机构开始工作,加速腔体内气体流动。由于PACK包内部压力大于外部压力,PACK包内部的示踪气体在压力差的作用下,通过包体漏孔泄漏到累积测试腔体内,与腔体内的空气混合。在气体搅拌系统的作用下,使得混合更加快速,均匀。
所述测试分析系统,通常为质谱测试分析系统,由氦(氢)质谱仪,计算单元等组成。测试分析系统对累积测试腔内的混合气体进行采样,并对采样气体质谱分析,确定示踪气体含量。并通过下列公式计算,得出PACK包的实际漏率。
Q=ΔC*Pt*V
Q:产品漏率,单位通常为mbar·l/s,或Pa·m3/s;
ΔC:累积腔内示踪气体的含量变化率,单位通常为%/s;
Pt:累积腔内的压力,单位通常为P;
V:累积腔内的净容积,单位通常为m3。
基于上述系统,本发明还提出了一种基于累积测试的车用电池PACK包检漏方法,该方法在大气压下进行测试,其具体包括以下步骤:
步骤1:PACK包通过传输系统进入累积测试腔体,PACK包的防水透气孔与累积测试腔体通过软管对接,累积测试腔体的腔门关闭;
步骤2:PACK包内示踪气体的混气充注
向PACK内部充入一定量的氦气或其他气体(如氢气等),作为示踪气体,并实现示踪气体在PACK内部的均匀分布。完成该步骤的子系统称为PACK包体混气充注系统。该步骤可以于累积测试腔体内完成,也可以在累积测试腔体外完成。
同一漏孔在不同的示踪气体压力和浓度下,其漏率不同。示踪气体的精确充注,是得到正确漏率的前提。
步骤3:累积测试腔体内气体搅拌
完成示踪气体混气充注后的PACK包,在累积测试腔体内,进行气体搅拌,加速泄漏后示踪气体与累积测试腔内的空气混合,并实现泄漏后的示踪气体在该腔体内的均匀分布。完成该步骤的子系统称为气体搅拌系统。
步骤4:测试分析系统
在气体搅拌的同时,或停止搅拌的期间,当累积测试腔内的示踪气体混合均匀后,检测浓度和压力是否达标,若是未达标,记录NG,若是达标,测试分析系统开始累积测试腔体内的示踪气体进行实时采样测试分析。通常由质谱仪分析出示踪气体的实时含量变化率。达到检测设定时间之后,根据该变化率计算出产品漏率,计算公式如下:
Q=ΔC*Pt*V
Q:产品漏率,单位通常为mbar·l/s,或Pa·m3/s;
ΔC:累积腔内示踪气体的含量变化率,单位通常为%/s;
Pt:累积腔内的压力,单位通常为Pa;
V:累积腔内的净容积,单位通常为m3。
步骤5:漏率合格,结束测试,打开累积测试腔体,断开产品与累积测试腔体的连接,取出产品。
本发明的有益效果在于:本发明所述方法可以在大气压下对电池PACK包进行密封性能测试,以符合IP67、IP68相应的密封等级要求。该方法既解决了传统气检法测量由于测量精度不够,无法满足IP67、IP68的测试要求,又解决了传统真空氦检法对电池PACK内电芯的损伤难题。
附图说明
图1是本发明基于累积测试的车用电池PACK包检漏系统。
图2是本发明基于累积测试的车用电池PACK包检漏方法举例。
具体实施方式
结合以下具体实施例和附图,对实用新型作进一步的详细说明。实施本发明的过程、条件、实验方法等,除以下专门提及的内容之外,均为本领域的普遍知识和公知常识,本发明没有特别限制内容。
本发明一种基于示踪气体累积法测试的PACK包密封性能测试系统,包括累积测试腔体、气体搅拌系统、PACK包体混气充注系统、测试分析系统;其中,
所述PACK包体混气充注系统,包括抽空部件,注气部件,压力监控单元,和浓度监控部件;
所述气体搅拌系统,包括搅拌风扇,实现泄漏后的示踪气体在累积测试腔体内的均匀分布;所述搅拌风扇,有至少一组,排布在累积测试腔体内部,位置分布和开启频率根据不同的箱体形状调整;
所述累积测试腔体,是进行气体搅拌和累积测试的密闭容器,并设有开关门机构,以供PACK包的进出;上部设置有清氦排气口;底部设置有设备架台;累积测试腔体与PACK包的防水透气孔通过软管对接;完成示踪气体混气充注后PACK包,进入该累积测试腔体后,腔门关闭,气体搅拌机构开始工作,加速腔体内气体流动。由于PACK包内部压力大于外部压力,PACK包内部的示踪气体在压力差的作用下,通过包体漏孔泄漏到累积测试腔体内,与累积测试腔体内的空气混合;在气体搅拌系统的作用下,使得混合更加快速,均匀;
所述测试分析系统,为质谱测试分析系统,包括氦质谱仪或氢质谱仪,计算单元;测试分析系统对累积测试腔内的混合气体进行采样,并对采样气体质谱分析,确定示踪气体含量。
基于以上系统,本发明提供了一种基于示踪气体累积法测试的PACK包密封性能测试方法,包括以下步骤:
步骤1:PACK包通过传输系统进入累积测试腔体,PACK包的防水透气孔与累积测试腔体通过软管对接,累积测试腔体的腔门关闭;
步骤2:向PACK内部充入示踪气体,并实现示踪气体在PACK内部的均匀分布;完成该步骤的子系统,称为PACK包体混气充注系统;该步骤可以与累积测试腔体内完成,也可以在累积测试腔体外完成;
步骤3:完成示踪气体混气充注后的PACK包,在累积测试腔体内,进行气体搅拌,加速泄漏后示踪气体与累积测试腔内的空气混合,并实现泄漏后的示踪气体在该腔体内的均匀分布;完成该步骤的子系统称为气体搅拌系统;
步骤4:在气体搅拌的同时,或停止搅拌的期间,测试分析系统对累积测试腔体内的示踪气体进行实时采样测试,并对记录的值,进行运算得出当前的产品漏率;
步骤5:漏率合格,结束测试,打开累积测试腔体,断开产品与累积测试腔体的连接,取出产品。
所述产品漏率的计算公式如下:
Q=ΔC*Pt*V
Q:产品漏率,单位为mbar·l/s,或Pa·m3/s;
ΔC:累积腔内示踪气体的含量变化率,单位为%/s;
Pt:累积腔内的压力,单位为Pa;
V:累积腔内的净容积,单位为m3。
本发明所述示踪气体包括氦气、氢气。
PACK包体混气充注系统与其他系统独立,成为单独系统。即被测产品先进行混气充注,再进入累积测试腔体进行测试。是一种可替换的结构。
对于PACK包体混气充注系统又有一种可替换的结构,就是直接充注,不进行混气,在某些场景中,也是可行的方案。
本发明的保护内容不局限于以上实施例。在不背离实用新型构思的精神和范围下,本领域技术人员能够想到的变化和优点都被包括在本发明中,并且以所附的权利要求书为保护范围。
Claims (6)
1.一种基于示踪气体累积法测试的车用电池PACK包密封性能测试系统,其特征在于,该系统用于在大气压下进行测试,其包括累积测试腔体、气体搅拌系统、PACK包体混气充注系统、测试分析系统;其中,
所述PACK包体混气充注系统包括:抽空部件、注气部件、压力监控单元和浓度监控部件;
所述气体搅拌系统包括:搅拌风扇,实现泄漏后的示踪气体在累积测试腔体内的均匀分布;
所述累积测试腔体为进行气体搅拌和累积测试的密闭容器,并设有开关门机构,以供PACK包的进出;所述累积测试腔体上部设置有清氦排气口;所述累积测试腔体底部设置有设备架台;所述累积测试腔体与PACK包的防水透气孔通过软管对接;
所述测试分析系统包括:氦质谱仪或氢质谱仪,计算单元;所述测试分析系统对累积测试腔内的混合气体进行采样,由质谱仪分析出示踪气体的实时含量变化率;达到检测设定时间之后,根据该变化率计算出产品漏率。
2.如权利要求1所述的基于示踪气体累积法测试的车用电池PACK包密封性能测试系统,其特征在于,所述示踪气体包括氦气、氢气。
3.如权利要求1所述的基于示踪气体累积法测试的车用电池PACK包密封性能测试系统,其特征在于,所述搅拌风扇有至少一组,其排布在所述累积测试腔体内部,位置分布和开启频率根据不同的箱体形状调整。
4.如权利要求1所述的基于示踪气体累积法测试的车用电池PACK包密封性能测试系统,其特征在于,所述测试分析系统为质谱测试分析系统。
5.一种基于示踪气体累积法测试的车用电池PACK包密封性能测试方法,其特征在于,该方法在大气压下进行测试,其包括以下步骤:
步骤1:PACK包通过传输系统进入累积测试腔体,PACK包的防水透气孔与累积测试腔体通过软管对接,累积测试腔体的腔门关闭;
步骤2:向PACK内部充入示踪气体,并实现示踪气体在PACK内部的均匀分布;完成该步骤的子系统,称为PACK包体混气充注系统;该步骤在累积测试腔体内完成,或在累积测试腔体外完成;
步骤3:完成示踪气体混气充注后的PACK包,在累积测试腔体内,进行气体搅拌,加速泄漏后示踪气体与累积测试腔内的空气混合,并实现泄漏后的示踪气体在该腔体内的均匀分布;完成该步骤的子系统称为气体搅拌系统;
步骤4:在气体搅拌的同时,或停止搅拌的期间,测试分析系统对累积测试腔体内的示踪气体进行实时采样测试,对记录的值进行运算得出当前的产品漏率;所述产品漏率的计算公式如下:
Q=ΔC*Pt*V
Q:产品漏率,单位为mbar·l/s,或Pa·m3/s;
ΔC:累积腔内示踪气体的含量变化率,单位为%/s;
Pt:累积腔内的压力,单位为Pa;
V:累积腔内的净容积,单位为m3;
步骤5:漏率合格,结束测试,打开累积测试腔体,断开产品与累积测试腔体的连接,取出产品;
其中,
所述方法采用基于示踪气体累积法测试的车用电池PACK包密封性能测试系统,所述系统包括累积测试腔体、气体搅拌系统、PACK包体混气充注系统、测试分析系统;其中,
所述PACK包体混气充注系统包括:抽空部件、注气部件、压力监控单元和浓度监控部件;
所述气体搅拌系统包括:搅拌风扇,实现泄漏后的示踪气体在累积测试腔体内的均匀分布;
所述累积测试腔体为进行气体搅拌和累积测试的密闭容器,并设有开关门机构,以供PACK包的进出;所述累积测试腔体上部设置有清氦排气口;所述累积测试腔体底部设置有设备架台;所述累积测试腔体与PACK包的防水透气孔通过软管对接;
所述测试分析系统包括:氦质谱仪或氢质谱仪,计算单元;所述测试分析系统对累积测试腔内的混合气体进行采样,并对采样气体质谱分析,确定示踪气体含量。
6.如权利要求5所述的基于示踪气体累积法测试的车用电池PACK包密封性能测试方法,其特征在于,当累积测试腔内的示踪气体混合均匀后,检测浓度和压力是否达标,若是未达标,记录NG,若是达标,测试分析系统开始累积测试腔体内的示踪气体进行实时采样测试分析。
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