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href="http://www.ex-cimer.com" target="_blank">EEPW首頁(yè)</a> > <a href="/info/industry/special/embedded">嵌入式系統(tǒng)</a> > <a href="/info/articlelist/special/embedded/type/5">設(shè)計(jì)應(yīng)用</a> > 通過(guò)FEA提升鋰離子電池?zé)峁芾硇阅?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="xdcxdvc" id="container"> <section> <article> <h1>通過(guò)FEA提升鋰離子電池?zé)峁芾硇阅?/h1> <div id="svflkcq" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2016-12-19</span> <span>來(lái)源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="ddgtybi" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_1.jpg" 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src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><font face="Arial"><strong>汽車(chē)</strong>鋰離子</font><font face="Arial">電池</font><font face="Arial">的性能和使用壽命與電池的工作溫度有著非常直接的關(guān)系。電池?zé)峁芾硎请姵卦O(shè)計(jì)時(shí)需要考慮的最主要因素，尤其是那些間接式風(fēng)冷或間接式液冷的熱管理系統(tǒng)，因?yàn)槔鋮s介質(zhì)并不與電池單元直接接觸。<br /><br />插電式混合動(dòng)力車(chē)（PHEV）有兩種工作模式，分別為電量消耗模式（CD）和電量維持模式（CS）。電池包的容量是由電量消耗模式的行駛里程決定的。在這種模式下，電池單元的荷電狀態(tài)通常會(huì)從90%下降到25%（假設(shè)電池的可使用容量變化范圍為65%）。如果針對(duì)乘用車(chē)來(lái)說(shuō)，在電量消耗模式下電量損耗假設(shè)為400-500 W·h/km的話，那么整個(gè)電池包的容量在電量消耗模式下需要能夠在15~20kW·h范圍內(nèi)行駛64km。 </font><p align="center"><font face="Arial"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" border="0" src="http://www.newmaker.com/u/2013/20131/art_img/201311115504416142.jpg" /></font></p>本文引用地址：<a href="http://www.ex-cimer.com/article/201612/331556.htm">http://www.ex-cimer.com/article/201612/331556.htm</a>在電量消耗模式運(yùn)行結(jié)束后，電池單元內(nèi)部會(huì)產(chǎn)生大量的熱量，這主要是由于較高的放電/充電<strong>脈沖電流</strong>及較高的電池單元內(nèi)部電阻造成的，而這些也會(huì)隨著電池電量的消耗不斷增加。此外，因?yàn)椴咫娛交旌蟿?dòng)力車(chē)電池僅在電量消耗模式下才可以達(dá)到滿(mǎn)負(fù)荷工作狀態(tài)，因此在電量消耗模式運(yùn)行結(jié)束后電池的熱量會(huì)達(dá)到最大值。電池單元內(nèi)部積累的熱量越多，電池的溫度就會(huì)越高。<br /><br />電池單元的最高溫度和最大溫差是影響電池耐久性和安全性的兩個(gè)關(guān)鍵因素。為了讓電池發(fā)揮最佳的性能，電池包內(nèi)電池單元的工作溫度應(yīng)該控制在一個(gè)合理的范圍內(nèi)。在特定的工作環(huán)境下，電池單元內(nèi)的溫度分布應(yīng)該盡量保持均勻，這樣才能確保電池的耐久性和安全性。<br /><br />提高電池的熱管理性能需要深入了解電池包內(nèi)電池單元在不同布局和冷卻條件下的熱表現(xiàn)。在電池包冷卻系統(tǒng)設(shè)計(jì)方面，電池溫度變化熱模擬可以發(fā)揮重要的作用。AVL Powertrain Engineering公司工程師通過(guò)模擬插電式混合動(dòng)力車(chē)的應(yīng)用環(huán)境對(duì)采用間接式液冷熱管理的<strong>鋰離子電</strong>池包的熱表現(xiàn)進(jìn)行了理論研究。<br /><br />工程師采用的電池包包含96個(gè)大功率電池單元，平均放置在八個(gè)模塊內(nèi)。電池單元采用串聯(lián)的方式，整個(gè)電池包的容量為20kW·h。每個(gè)模塊放在并排的結(jié)構(gòu)（熱對(duì)稱(chēng)）中。電池單元通過(guò)與冷板直接接觸的鋁翅片（1.5mm厚）進(jìn)行冷卻。<br /><br />研究人員采用了一個(gè)簡(jiǎn)單的<strong>FEA</strong>模型對(duì)單冷板和雙冷板冷卻效果都進(jìn)行了分析，還對(duì)冷板表面溫度變化給電池單元溫度分布造成的影響進(jìn)行了研究。研究結(jié)果如下：<br /><br />◆電池單元的溫度分布受到冷板位置的影響非常大；<br />◆冷板內(nèi)冷卻液流動(dòng)的方向?qū)卫浒謇鋮s效果的影響不明顯，但是會(huì)對(duì)雙冷板冷卻的最大溫差造成較大的影響；<br />◆雙冷板的冷卻容量是單冷板的兩倍，因此在相同的電池負(fù)載下，采用雙冷板進(jìn)行冷卻的電池最高溫度比單冷板的低很多，最大溫差也小很??；<br />◆單冷板和雙冷板最大溫度出現(xiàn)位置不同：?jiǎn)卫浒宄霈F(xiàn)在正極附近，而雙冷板冷卻出現(xiàn)在正負(fù)極之間的區(qū)域內(nèi)；<br />◆雙冷板冷卻中電池接線端的溫度比單冷板冷卻低很多，因?yàn)殡姵亟泳€端和母線產(chǎn)生的電阻熱可以直接引導(dǎo)到雙冷板冷卻中的冷板上。而在單冷板冷卻中，冷板通常放置在電池接線端對(duì)面位置。電池接線端和母線產(chǎn)生的電阻熱只能順著熱傳導(dǎo)路徑擴(kuò)撒掉。電池?zé)嶙璧脑黾訒?huì)導(dǎo)致接線端和母線產(chǎn)生的電阻熱在電池內(nèi)聚集，從而導(dǎo)致接線端子附近的溫度進(jìn)一步上升。(end) </span>  <div class="xazjblh" id="coverDiv" class="article_reg" 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