I am trying to model a battery pack of Li-ion cylindrical cells. I read somewhere that heat transfers significantly along the plane of electrodes. means in the cylindrical cell, more heat transfer will occur in the axial direction. But in the image, which is from a research paper on designing BTMS, they didn't simulate the top and bottom parts of the cell, saying that heat transfer will occur from the side of cells. Can anyone please explain what is the correct thing?