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  • 用多少充多少 新能源汽車不宜使用大功率充電

    • 2019-05-14 11:25
    • 來源:中國消費者報

    摘要:國家新能源汽車創新工程項目專家組組長王秉剛在接受記者專訪時透露,去年國內發生的40多起新能源車火災事故中,超半數是因為新能源車主在使用大功率充電過程中或車輛在大功率充電后發生起火事故。

    “建議廣大新能源車主最好不要使用大功率快充方式為車輛充電,這樣的充電方式有可能會在實際使用過程中帶來一定安全隱患。”國家新能源汽車創新工程項目專家組組長王秉剛在接受記者專訪時透露,去年國內發生的40多起新能源車火災事故中,超半數是因為新能源車主在使用大功率充電過程中或車輛在大功率充電后發生起火事故。

    其實,自大功率充電推出以來,業界就不乏諸多質疑聲,其中電池安全性首當其沖。

    據悉,半個月前,上海徐匯區地下車庫內發生自燃的特斯拉在事發前剛剛做了一次“超級充電”,用最短的時間將電池充滿接近滿電狀態。

    王秉剛表示,很多人只認識到大功率充電會快速提升車輛充電時間這一優勢,往往忽略掉它背后產生的連鎖反應。車輛在充電過程中,無論是長達幾個小時的慢充還是一個小時左右的快充,從化學角度來看,均被視為是“大功率”電流持續輸出狀態,絕大多數消費者認為只有快充才是大功率充電,這是一種錯誤觀念。

    大功率充電無疑意味著更大電流、更高電壓,在很大程度上也給設備、車輛提出了很高的要求。

    王秉剛表示,大功率充電對動力電池而言,是一種最嚴苛的工作狀態,導致電池溫度直線上升,電池表面溫度分布最不均勻,也是最損傷電池的一種行為。“我參加動力電池壽命試驗時發現,使用大功率充電的動力電池一定會影響電池壽命,降低電池中的活性物質。”他說道。

    如此一來,新能源車充電問題陷入了無奈的悖論:一邊新能源車主希望充電速度越來越快,這樣才能減少不必要的等待;但從技術角度考慮,這就意味著安全性的下降。

    隨著新能源車保有量快速增長,越來越多的消費者將面對新能源車充電的安全問題。那么,除了避免給車輛進行大功率充電外,哪一種才是對車輛較好的充電方式呢?

    王秉剛表示,在新能源車領域,深充深放的充電方式不值得提倡,消費者不要像使用傳統燃油車一樣等油量殆盡才去加油,頻繁的深充深放會降低動力電池壽命。與之相反的是,如果條件允許,建議消費者最好采用淺充淺放的方式,用了多少電量就充多少電量,是最為理想的選擇。


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