Hava Soğutmalı Batarya Paketinde Akış Tasarımının ve Saptırıcı Plaka Etkisinin Farklı Deşarj Oranlarında İncelenmesi

Öz

Bu çalışmada, hava soğutmalı batarya paketinde farklı akış tasarımının ve saptırıcı plaka kullanımının termal performansa etkisi CFD yöntemi ile incelenmiştir. Çalışmada, geleneksel tek girişli akış yapısına sahip olan Model A ile çift girişli ve saptırıcı plakalarının kullanıldığı Model B karşılaştırılmıştır. Her iki modelde de 24 adet 18650 tip lityum iyon batarya hücresi kullanılmış olup, batarya paketinin hava giriş ve çıkış yüzey alanları eşit olacak şekilde tasarlanmıştır. 3C ve 4C deşarj oranları için gerçekleştirilen analizler sonucunda, çift girişli akış yapısının ve saptırıcı plakaların batarya paketindeki soğutma etkinliğini belirgin biçimde artırdığı gözlemlenmiştir. 3C deşarj oranında, Model B ile elde edilen maksimum batarya sıcaklığının ve maksimum sıcaklık farkının Model B’ye kıyasla sırasıyla 1,87 K ve 1,08 K daha düşük olduğu tespit edilmiştir. 4C deşarj oranında ise bu iyileştirme daha da belirgin hale gelerek maksimum batarya sıcaklığı 2,49 K, maksimum sıcaklık farkı ise 1,44 K kadar azaltılmıştır. Sıcaklık kontürleri incelendiğinde, Model A’da özellikle arka bölgelerde sıcaklık birikimlerinin oluştuğu ve Model B’de daha homojen dağılım meydana geldiği gözlemlenmiştir.

Anahtar Kelimeler

• Batarya paketi
• Hava soğutma
• Saptırıcı plaka
• Batarya termal yönetim sistemi

INVESTIGATION OF FLOW DESIGN AND DEFLECTOR PLATE EFFECT IN AIR COOLED BATTERY PACK AT DIFFERENT DISCHARGE RATES

Öz

In this study, the effect of different flow designs and the use of deflector plates on the thermal performance of an air cooled battery pack was investigated using the CFD method. Model A, which has a conventional single inlet flow structures, was compared with Model B, which employs dual inlets and deflector plates. In both models, 24 cylindrical 18650 lithium-ion battery cells were used, and the inlet and outlet surface areas of the battery pack were designed to be equal. Analyses performed at 3C and 4C discharge rates showed that the dual inlet flow structure and deflector plates significantly improved the cooling efficiency of the battery pack. At a 3C discharge rate, the maximum battery temperature and maximum temperature difference obtained with Model B were 1.87 K and 1.08 K lower, respectively, compared to Model A. At a 4C discharge rate, this improvement became even more pronounced, with the maximum battery temperature reduced by 2.49 K and the maximum temperature difference decreased by 1.44 K. Examination of the temperature contours revealed that, in Model A, heat accumulation occurred particularly in the rear regions, whereas Model B achieved a more homogeneous temperature distribution.

Anahtar Kelimeler

• Battery pack
• Air cooled
• Deflector plate
• Battery thermal management system

Kaynakça

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