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車用動力電池熱安全研究取得階段性進展

2019/3/4 10:12:58??????點擊:
  動(dong)力電池(chi)熱(re)安全問(wen)題是影(ying)響(xiang)電動(dong)汽(qi)車行駛安全的關鍵(jian)。在(zai)國家重點研發計(ji)劃“新(xin)能(neng)源汽(qi)車”專項(xiang)2016年(nian)度立項(xiang)項(xiang)目(mu)“高(gao)比能(neng)量動(dong)力鋰離(li)子電池(chi)開發與產業化技術攻關”的實施(shi)中,研發團隊針對高(gao)比能(neng)量鋰離(li)子動(dong)力電池(chi)熱(re)安全機理和安全設計(ji)開展了深(shen)入研究,目(mu)前取(qu)得了階段性進展。
  項目團隊圍繞鋰(li)離子(zi)電(dian)(dian)(dian)池(chi)(chi)在充放(fang)電(dian)(dian)(dian)過程(cheng)中的(de)產(chan)熱(re)(re)(re)過程(cheng)、各(ge)成分(fen)的(de)熱(re)(re)(re)穩(wen)定性(xing),以(yi)1Ah鋰(li)離子(zi)電(dian)(dian)(dian)池(chi)(chi)單體為研究(jiu)對(dui)象,通過實驗(yan)獲得表(biao)觀導熱(re)(re)(re)系數(shu)(shu)、各(ge)向異性(xing)導熱(re)(re)(re)系數(shu)(shu)、恒壓比(bi)熱(re)(re)(re)容(rong)、溫度(du)(du)系數(shu)(shu)及室溫內阻,從(cong)而(er)計算出(chu)生熱(re)(re)(re)速率。定性(xing)分(fen)析了(le)電(dian)(dian)(dian)池(chi)(chi)在100%電(dian)(dian)(dian)量和(he)0%電(dian)(dian)(dian)量兩個狀態下正負極材(cai)料(liao)的(de)熱(re)(re)(re)穩(wen)定性(xing)以(yi)及電(dian)(dian)(dian)解液對(dui)其熱(re)(re)(re)穩(wen)定性(xing)的(de)影響。在電(dian)(dian)(dian)池(chi)(chi)的(de)熱(re)(re)(re)失控(kong)部分(fen)采用加速量熱(re)(re)(re)方法(fa)對(dui)100%電(dian)(dian)(dian)量的(de)軟包鋰(li)離子(zi)電(dian)(dian)(dian)池(chi)(chi)進行熱(re)(re)(re)失控(kong)實驗(yan),確定了(le)電(dian)(dian)(dian)池(chi)(chi)的(de)熱(re)(re)(re)失控(kong)起(qi)始溫度(du)(du)、最高溫度(du)(du)以(yi)及自(zi)升(sheng)溫速率。相(xiang)關研究(jiu)成果和(he)試驗(yan)結(jie)果為動(dong)力電(dian)(dian)(dian)池(chi)(chi)的(de)熱(re)(re)(re)安全結(jie)構設(she)計提供了(le)理論(lun)和(he)數(shu)(shu)據基(ji)礎。
  該項目(mu)團(tuan)隊圍繞(rao)熱固(gu)(gu)(gu)性(xing)(xing)(xing)(xing)聚(ju)合(he)物材(cai)料(liao)(liao)和(he)(he)正溫度(du)系數熱敏材(cai)料(liao)(liao)(PTC材(cai)料(liao)(liao))在(zai)電(dian)池(chi)單(dan)(dan)體(ti)中(zhong)(zhong)的(de)(de)應用(yong)工(gong)(gong)藝與技(ji)(ji)術,結(jie)合(he)理(li)化分析(xi)測(ce)試(shi)、電(dian)化學測(ce)試(shi)、電(dian)性(xing)(xing)(xing)(xing)能(neng)測(ce)試(shi)和(he)(he)電(dian)池(chi)安全性(xing)(xing)(xing)(xing)能(neng)測(ce)試(shi)等手段,研究(jiu)了(le)熱固(gu)(gu)(gu)性(xing)(xing)(xing)(xing)聚(ju)合(he)物材(cai)料(liao)(liao)在(zai)電(dian)池(chi)中(zhong)(zhong)的(de)(de)應用(yong)工(gong)(gong)藝,達(da)到了(le)優(you)化應用(yong)工(gong)(gong)藝流程的(de)(de)目(mu)的(de)(de);研究(jiu)了(le)正溫度(du)系數熱敏材(cai)料(liao)(liao)(PTC材(cai)料(liao)(liao))的(de)(de)修(xiu)飾液濃度(du)、修(xiu)飾方式和(he)(he)涂層厚度(du)對電(dian)池(chi)電(dian)性(xing)(xing)(xing)(xing)能(neng)和(he)(he)安全性(xing)(xing)(xing)(xing)能(neng)的(de)(de)影響(xiang),進而優(you)化PTC材(cai)料(liao)(liao)的(de)(de)應用(yong)工(gong)(gong)藝和(he)(he)技(ji)(ji)術。目(mu)前(qian),項目(mu)研究(jiu)成果為熱固(gu)(gu)(gu)性(xing)(xing)(xing)(xing)聚(ju)合(he)物材(cai)料(liao)(liao)和(he)(he)PTC材(cai)料(liao)(liao)在(zai)電(dian)池(chi)單(dan)(dan)體(ti)中(zhong)(zhong)的(de)(de)應用(yong)提供了(le)工(gong)(gong)藝和(he)(he)技(ji)(ji)術指導,解決了(le)熱固(gu)(gu)(gu)性(xing)(xing)(xing)(xing)聚(ju)合(he)物材(cai)料(liao)(liao)和(he)(he)PTC材(cai)料(liao)(liao)在(zai)電(dian)池(chi)單(dan)(dan)體(ti)中(zhong)(zhong)應用(yong)的(de)(de)基(ji)礎技(ji)(ji)術和(he)(he)關鍵技(ji)(ji)術,為解決電(dian)池(chi)單(dan)(dan)體(ti)的(de)(de)熱失(shi)控問(wen)題奠定了(le)良(liang)好的(de)(de)基(ji)礎。
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