2022-08-05
1、锂电池的超声(sheng)波金属点(dian)焊
由于(yu)锂电池电芯正极耳是铝带,不能直接锡焊(han)(han)(han),需要加镍(nie)带,通常采用(yong)超声波金属点(dian)焊(han)(han)(han)方法。利用(yong)超声波高频(pin)振(zhen)荡使两块(kuai)金属片局部摩擦产(chan)生高热(re)量(liang),并将其熔合连接起来。频(pin)率为20K~35KHZ,时间约0.3/ s。金属超声波焊(han)(han)(han)机注(zhu)(zhu)意(yi)选择(ze)合适的焊(han)(han)(han)接设(she)备(bei);注(zhu)(zhu)意(yi)使用(yong)适当的焊(han)(han)(han)接参数。正铝带防止(zhi)过焊(han)(han)(han),否则容易(yi)断裂(lie)。
2、锂电池焊锡连接
主要原理:用烙铁将焊锡(xi)丝(si)熔化(hua),使锡(xi)料(liao)附着在被焊部位,冷却后连(lian)接。
(1)烙铁(tie)类型(xing):内热式和外热式,内热式烙铁(tie)加热更(geng)快。普通烙铁(tie)、恒(heng)温(wen)烙铁(tie)、防(fang)静电恒(heng)温(wen)烙铁(tie)。
(2)烙(luo)铁功率:30W、35W、40W、50W、55W、60W、65W等(deng)。
(3)烙铁(tie)温(wen)(wen)度(du):根(gen)据焊锡面积和锡量,温(wen)(wen)度(du)过低会迅速(su)熔化(hua)锡线,影响焊接速(su)度(du),温(wen)(wen)度(du)过高,焊点不光滑(hua)。烙铁(tie)的(de)温(wen)(wen)度(du)一(yi)般设定在360℃±10℃。
(4)焊接工艺:有握笔法、直握法。
(5)焊(han)接角(jiao)度(du):握焊(han)角(jiao)度(du)在30°~ 60°之间(jian),佳角(jiao)度(du)为烙铁(tie)尖端与待焊(han)物体成45°。
(6)焊接时间:<3S。
(7)焊接(jie)质量(liang):焊点光(guang)亮均匀、牢固、无(wu)(wu)锡、无(wu)(wu)漏焊、无(wu)(wu)假焊、无(wu)(wu)气(qi)孔(kong)、无(wu)(wu)分层。焊点的尺寸与热锡接(jie)触量(liang)有关。
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聚(ju)(ju)(ju)合物(wu)(wu)锂(li)离子(zi)(zi)电(dian)(dian)池可分(fen)为三类(lei),具体(ti)如(ru)下:1、固体(ti)聚(ju)(ju)(ju)合物(wu)(wu)电(dian)(dian)解(jie)(jie)质锂(li)离子(zi)(zi)电(dian)(dian)池。电(dian)(dian)解(jie)(jie)质是聚(ju)(ju)(ju)合物(wu)(wu)和(he)盐的(de)混合物(wu)(wu)。该(gai)电(dian)(dian)池室温(wen)下离子(zi)(zi)电(dian)(dian)导率低,可应用(yong)于高(gao)温(wen)环(huan)境下。2、凝胶聚(ju)(ju)(ju)合物(wu)(wu)电(dian)(dian)解(jie)(jie)质锂(li)离子(zi)(zi)电(dian)(dian)池。即在固体(ti)聚(ju)(ju)(ju)合物(wu)(wu)电(dian)(dian)解(jie)(jie)质中加(jia)入增塑剂(ji)等添加(jia)剂(ji),以(yi)提高(gao)离子(zi)(zi)电(dian)(dian)导率,一般应用(yong)于常温(wen)
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锂(li)(li)离(li)子(zi)电(dian)池(chi)的容量由正(zheng)极(ji)(ji)(ji)材料的活性(xing)锂(li)(li)离(li)子(zi)和负(fu)极(ji)(ji)(ji)材料嵌入和脱(tuo)锂(li)(li)的能力决(jue)定(ding)(ding)。正(zheng)负(fu)极(ji)(ji)(ji)在各种环(huan)境下(xia)的稳定(ding)(ding)性(xing)决(jue)定(ding)(ding)了电(dian)池(chi)的性(xing)能,甚至严重影响了电(dian)池(chi)的安(an)全性(xing)。因此(ci),电(dian)极(ji)(ji)(ji)的性(xing)能在一定(ding)(ding)程(cheng)度(du)上决(jue)定(ding)(ding)了锂(li)(li)离(li)子(zi)电(dian)池(chi)的整体(ti)性(xing)能。目(mu)前,商用(yong)锂(li)(li)离(li)子(zi)电(dian)池(chi)负(fu)极(ji)(ji)(ji)材料主要(yao)为石墨(mo)基碳(tan)负(fu)极(ji)(ji)(ji)材料,