據(jù)車云網(wǎng)5月28日?qǐng)?bào)道,作為動(dòng)力輸出的后盾,電池對(duì)電動(dòng)車的作用不言而喻。因?yàn)楸旧硇阅茌^穩(wěn)定、安全系數(shù)較高且可循環(huán)充電次數(shù)多,磷酸鐵鋰電池是目前市場(chǎng)上動(dòng)力電池的首選,如雪佛蘭Volt、日產(chǎn)Leaf、比亞迪E6和Fisker Karma。
在汽車上使用鈷酸鋰電池,特斯拉算第一個(gè)
特斯拉則有些另類,他旗下的Roadster和Model S使用的是18650鈷酸鋰電池。與磷酸鐵鋰電池相比,這種電池雖然技術(shù)較為成熟,功率高、能量密度大、且一致性較高,但安全系數(shù)較低,熱特性和電特性較差,成本也相對(duì)較高。
據(jù)業(yè)內(nèi)人士介紹,18650電池外電壓但凡低于2.7V或高于3.3V,都會(huì)出現(xiàn)過(guò)熱的癥狀。如果電池組較大且組內(nèi)溫度梯度控制得不好,就會(huì)存在很大的起火風(fēng)險(xiǎn)。而電池技術(shù)的關(guān)鍵恰恰就是電壓電流和熱量控制,難怪Tesla被批評(píng)為電池技術(shù)不靠譜。
但實(shí)際上,被認(rèn)為更安全可靠的磷酸鐵鋰電池也并非萬(wàn)無(wú)一失。在制備的燒結(jié)過(guò)程中,氧化鐵在高溫環(huán)境下存在被還原成單質(zhì)鐵的可能性,單質(zhì)鐵會(huì)引起電池的微短路,這是電池中很忌諱的物質(zhì)。此外,磷酸鐵鋰電池在實(shí)際生產(chǎn)中充放電曲線差異大,一致性較差且能量密度較低,這直接影響到電動(dòng)車敏感的續(xù)航問(wèn)題。海通國(guó)際證券公司最新的研報(bào)顯示:特斯拉電池能量密度(170wh/kg)大約是比亞迪電動(dòng)車磷酸鐵鋰電池能量密度的兩倍?! ?/div>
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特斯拉使用的18650電池
早在上世紀(jì)70年代,英國(guó)賓漢頓大學(xué)的Whittingham女士就發(fā)明了18650電池,這種電池常應(yīng)用于筆記本電腦、強(qiáng)光手電等數(shù)碼產(chǎn)品上,但是,將這種直徑18mm、高65mm的圓柱形鋰電池用在汽車上,特斯拉是第一個(gè)吃螃蟹的人。
特斯拉的電池技術(shù)總監(jiān)Kurt Kelty曾經(jīng)表示:特斯拉起初也嘗試了市面上超過(guò)300種電池,包括板型和方型電池,最終選擇了松下的18650電池,一方面,18650的能量密度更大且穩(wěn)定性與一致性更好。另一方面,18650可以有效降低電池系統(tǒng)的成本。并且,雖然每個(gè)電池單元的尺寸小,但每個(gè)單元的能量可控制在較小的范圍,與使用大尺寸電池單元時(shí)相比,即使電池組的某個(gè)單元發(fā)生故障,也能降低故障帶來(lái)的影響。此外,全球每年要生產(chǎn)數(shù)十億個(gè)18650型電池單元,安全級(jí)別也在不斷提高。
松下官網(wǎng)顯示,型號(hào)為NCR18650的鋰電池是一款高能量模型(HighCapacity)電池,該電池的名義伏特?cái)?shù)為3.6V,名義最小容量為2750毫安時(shí),重量為45.5克。并且,在特斯拉第二代車型Model S上使用的18650比之前Roadster的能量密度高出3成。
據(jù)特斯拉首席技術(shù)官JB Straubel表述:從Roadster到Model S“轉(zhuǎn)型”的四年時(shí)間,電池組成本已經(jīng)下降了約44%,并且仍然會(huì)繼續(xù)下降。松下曾在2010年向特斯拉投資3000萬(wàn)美元,成為其股東之一。并且于2011年達(dá)成戰(zhàn)略協(xié)議,將負(fù)責(zé)特斯拉今后5年全部車輛的電池供應(yīng)。按照特斯拉目前預(yù)計(jì)每年2萬(wàn)輛的產(chǎn)量,松下18650將裝配在超過(guò)8萬(wàn)臺(tái)Model S上。
6831節(jié)鋰電池的神奇重組
18650存在安全風(fēng)險(xiǎn)是不爭(zhēng)的事實(shí),特斯拉如何“搞定”這一硬傷?秘密武器在于其電池管理系統(tǒng),給出的解決方案是將6831節(jié)2安時(shí)左右的松下18650封裝電池通過(guò)串聯(lián)和并聯(lián)結(jié)合在一起?! ?/div>

Tesla Roadster電動(dòng)跑車動(dòng)力系統(tǒng)
要驅(qū)動(dòng)一輛電動(dòng)車,需要大量的18650電池,Tesla Roadster的電池系統(tǒng)包含6831節(jié)小電池,而Tesla Model S更是高達(dá)8000節(jié),如何排列組裝這些數(shù)量眾多的小電池尤為重要。
這時(shí)候,特斯拉創(chuàng)始人之一Marc Tarpenning以往的經(jīng)驗(yàn)派上了用場(chǎng)。他曾是這個(gè)領(lǐng)域的專家并成功出售過(guò)一家公司。他把網(wǎng)絡(luò)控制領(lǐng)域用程序控制成百上萬(wàn)臺(tái)服務(wù)器的模式搬到了特斯拉電池系統(tǒng)控制領(lǐng)域,通過(guò)一年的DOE(design of experiment,實(shí)驗(yàn)設(shè)計(jì)),用分層次管理的辦法成功控制了這6831節(jié)小電池以及電壓和溫度:
69個(gè)18650電池被并聯(lián)封裝成一個(gè)電池磚;
99個(gè)電池磚串聯(lián)成一個(gè)電池片;
11個(gè)電池片組成一個(gè)電池包,總計(jì)6831節(jié)。
僅僅有這些層次還不夠,對(duì)于每一個(gè)層次都要進(jìn)行監(jiān)控,于是他們?cè)诿總€(gè)電池單元、每個(gè)電池磚、每個(gè)電池片的兩端均設(shè)置有保險(xiǎn)絲,一旦電池過(guò)熱或者電流過(guò)大則立刻融斷,斷開(kāi)輸出。
僅僅有保險(xiǎn)絲還是不夠,于是:
在每個(gè)電池片上,均設(shè)置有BMB (Battery Monitor board)即電池監(jiān)控板,用以監(jiān)控每個(gè)電池磚的電壓,溫度以及整個(gè)電池片的輸出電壓。
在整個(gè)電池包上,設(shè)置有BSM(Battery System Monitor),用以監(jiān)控整個(gè)電池包的工作環(huán)境。包括電池包的電流,電壓,溫度,濕度,方位,煙霧等。
在整車層面,設(shè)置有VSM (Vehicle SystemMonitor),用以監(jiān)控BSM。
這樣一套電池控制系統(tǒng)成為Tesla的技術(shù)核心,當(dāng)特斯拉剛剛公布這套造價(jià)高昂的系統(tǒng)時(shí)(傳言高于20000美金),很多業(yè)內(nèi)人士不約而同地對(duì)其唱衰,認(rèn)為將7000個(gè)電池放在汽車?yán)锏男袨槭强尚Φ?。但事?shí)卻給予他們有力的回應(yīng),雪佛蘭Volt起火、Fisker Karma車型更是一年內(nèi)發(fā)生三次自燃事件,而反觀特斯拉,不論是Roadster還是Tesla Model S都從未發(fā)生過(guò)起火自燃事件?! ?/div>

Tesla Model S電池板與車架融為一體的設(shè)計(jì)
特斯拉已經(jīng)和豐田、戴姆勒等廠商在電動(dòng)車領(lǐng)域進(jìn)行合作,包括為smart、奔馳A級(jí)、奔馳B級(jí)等車型電動(dòng)版提供電池動(dòng)力,給豐田RAV4電動(dòng)車提供電池組和電機(jī)等。目前戴姆勒持有特斯拉4.3%的股份,豐田也持有特斯拉2.9%的股份。但是由于特斯拉正式投入市場(chǎng)的產(chǎn)品時(shí)間不長(zhǎng)且數(shù)量不多,理論上完美的特斯拉電池系統(tǒng)還需繼續(xù)面臨實(shí)踐檢驗(yàn)。
關(guān)鍵字:特斯拉 什么 鋰電池
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