AUTO Tesla

What’s so special about the new battery technology for Tesla electric cars?

Tesla just introduced new battery technology with larger battery cells. As a result, the production cost of batteries is also reduced, leading to cheaper prices for electric vehicles.

As usual, every September, Tesla holds a “Battery Day” event to showcase advances in battery technology, as well as things surrounding Tesla’s ecosystem. In September 2020, Elon Musk, CEO of Tesla, also announced a new battery cell called 4680 (this name represents the diameter and height of the battery). And so far, the technology world is still expecting the features that this new battery brings.

It is known that the 4680 battery cell manufactured by Tesla itself, not an external outsourcing product. Currently, Tesla Model 3 and Model Y vehicles are using 2170 battery cells manufactured by Panasonic at the Tesla Gigafactory, in Nevada. In addition, Tesla also sourced batteries from CATL (China), LG Chem (Korea) and some other partners.

During Battery Day, Elon Musk also talked about the Tesla Model S Plaid electric car with more than 1,100 horsepower and the mileage of more than 830 km on a charge. Vehicles can accelerate from 0-96 km / h in less than 2 seconds and reach a maximum speed of more than 320 km / h. The price of the Model S Plaid will be $ 139,990 and will be available by the end of 2021. It is likely that the Tesla Model S Plaid will be the first model equipped with a new battery developed by Tesla.

It is known that traditional batteries are made of 3 components: the negative electrode layer, the anode layer and the insulation layer. In fact, each electrode layer comes with a different layer of active material to store charged particles. When rolled up, the edge of this electrode plate will be welded, to focus the layers of the electrode plate in the cell into a junction and connect to a term called “tab” – this thin end will bring charged particles in the electrode for external consumption.

Although this design has been in existence for decades, it has many disadvantages such as: charged particles will have to travel a long distance on the electrode plate to reach this thin, thin tab fiber, making it becomes the bottleneck for charging and discharging speeds. The long travel of charged particles easily heats the battery, as well as limits the speed at which it charges and discharges electricity.

Furthermore, concentrating current on these terminals increases the chance of battery failure when the tabs break or fail. That is not to mention the increase in production costs when the production process becomes more complex and interrupted into more stages. That’s why since the beginning of this year, Tesla filed a patent for a “tabless” battery – a non-conductive terminal battery, in order to eliminate the above disadvantages as well as improve the battery’s performance.

At the same time this also allows to significantly increase the size of each battery cell, increase the energy-to-battery ratio, and reduce the overall cost of battery packs on electric vehicles. Currently, Tesla electric vehicles are equipped with a 2170 battery cell (size 21mm x 70mm) that is larger and has twice the capacity of a normal 18650 battery cell. But the new tabless design will allow Tesla to create a new type of 4680 (46mm x 80mm) battery cell with five times the capacity per cell than before.

The design also simplifies the manufacturing process, with fewer parts per cell, and further reduces the cost of the battery, by up to 50% per kWh. Ultimately this will help Tesla achieve its multi-year goal of lowering the price of its electric cars equipped with self-driving mode to $ 25,000, or less than conventional gasoline cars.

Leave a Reply

Your email address will not be published. Required fields are marked *