Cylindrical cells are cheaper and faster to produce en mass as they lend themselves to automation.
Cylindrical cells have higher energy density (Wh/l) than both pouch and prismatic, but about the same specific energy (Wh/kg).
Even with the hexagonal close-pack formation, the triangular gap between them accounts for little lost space - it will still store more energy per litre than a prismatic or pouch.
Cylindrical cells don't deform due to swelling, because of the hoop strength in the steel can (which is barely 0.2 mm thick).
Cylindrical cells can be cooled from the radial surface without creating a large temperature differential within the cell. As heat is removed from one side, the thermal conductivity around the cell's content is high enough that you don't get a big difference from one side to the other. They can also be cooled from the top and bottom axis as well, but the thermal path is longer due to material gaps.
Finally, cylindrical cells are way more consistent when they leave the assembly line. They are 18.05 mm in diameter and 65.0 mm tall with very little deviation from this. Pouch cells on the other hand can vary in thickness my as much as 0.5 mm (or about 5%) which makes any errors multiply into major headaches during pack construction.
However, cylindrical cells are small, and a PITA to assemble and terminate compared to pouch cells, and to a lesser extent prismatics. Ultrasonic wirebonding to a uniform busplate is the gold standard - but at least this can be mechanised and automates - hence Tesla can smash out thousands of Model 3 packs each day. 2.6 to 3.4 Ah per cell is pretty small, hence Tesla's decision to move towards the larger cell which is closer to 5 Ah. Fewer parts to assemble, but still in the order of 4000 cells to a pack.
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Electric vehicles are becoming more popular every year, and there are now about 1.7 million EVs in operation in the USA.
With time, these cars are becoming more impressive and affordable due to advancements in EV technology. One of the elements that are quickly improving is electric car batteries, and there are now several types available. If you’re considering buying one, you might be wondering about the different options.
In this guide, we’ll take a look at the benefits of a vehicle with a prismatic cell so you can get a better understanding. Keep reading for more.
Durability is always a key factor with vehicle parts as drivers want something that won’t fall apart with regular use. Prismatic cells have a rigid structure that offers impressive strength and durability.
The outer casing ensures the internal components aren’t easily damaged. They can take a reasonable degree of impact and stress. This makes these EV cells perfect for everyday use on the road.
One of the reasons that EVs have only recently gained popularity is that they previously had poor energy density. This means that the cells couldn’t hold a huge amount of charge for their size, making them quite impractical. Prismatic cells, however, can hold a lot of charge while remaining compact.
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This means that an EV can go further on a single charge. EV charging isn’t available everywhere, so knowing you can go far between each charge is ideal. It also allows manufacturers to save space, which can help with other components and keep vehicles more compact.
All cells have a limited number of charges and discharges they can go through before they become unusable. The higher this is, the better, and prismatic cells can handle a lot of cycles before losing efficiency.
Ultimately, this means that they last longer before they need to be replaced. When purchasing a new vehicle, the lifespan of parts is usually a key factor for any buyer. Knowing that prismatic cells last a long time can be a huge benefit, especially as EV cells are typically quite expensive.
This is a factor that a lot of people don’t think about, but it’s a key benefit. Whenever electronics and other vehicle components are involved, heat management is essential. It will help maintain safety and reduce wear and tear on parts.
Prismatic cells can dissipate heat through their casing. This allows vehicles to operate without generating too much heat from their cells. If you live somewhere warm, this can be a vital factor that will help your car operate more efficiently and last longer.
There are constantly new advancements in the electric vehicle space, and this won’t change any time soon. Prismatic cells are durable, long-lasting, efficient, anwell manage heatnt. With time, they’ll likely continue to improve and become more common in EVs.
If you’re designing or manufacturing a new EV, you should consider the prismatic cell to power it. Mayco International is a global Tier 1 automotive supplier, so we can provide cells and other components to meet your needs.
We have been in business since 2006 and operate out of 38 locations worldwide. Check out our services page to find out more about how we can help.
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