On November 26th, Tesla showed the assembly information of the first batch of 4680 batteries. Compared with the batteries currently used, the new batteries have a 5 times higher energy density, a 16% increase in cruising range, and a 56% reduction in cost. The new battery pack of
adopts a module-free design and consists of about 960 (40x24) batteries, which is much less than the battery pack composed of thousands of 2170 batteries, because the energy density of the 4680 battery has increased by 5 times, reaching 300Wh /kg.
Tesla’s latest 4680 battery has a larger appearance and uses a non-polar ear design. How this new 4680 large battery cools itself: The electrodeless design of the electrode reduces the internal resistance of the battery. Tesla no longer uses battery modules, but puts the battery directly into the cast aluminum frame.
So the question is, if the heat is not discharged from the side of the battery, how to cool the 4680 new battery now? The electrodeless electrode design has an excellent cooling channel, so that it is not affected by both ends of the battery. The electrode itself can be made into a perfect cooling plate, bringing heat from the center of the battery and draining it from the top and bottom of the battery.
Heat transfer engineer’s calculations verified that the cooling coil concept used in Model 3 and Model Y does not have enough heat transfer to effectively cool the 4680 battery, while the new battery has sufficient heat transfer performance to discharge heat from the top and bottom of the battery . Thermal analysis also shows that Tesla may now adopt a design similar to a flat cooling plate, used with the battery top and bottom plates mentioned by Musk, to provide sufficient shear strength. The electrical connection can also be done through the battery top plate, which is very similar to another Tesla patent discussed earlier.
does not have a cooling coil, which means that Tesla can arrange the batteries closely together, which will bring a double advantage. Not only does it no longer use a physical battery casing, but also does not have a cooling coil, which results in a further reduction of the battery volume.
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