So far, we still don't know the battery specifications of the Tesla Model 3. Media reports and assumptions are different. Tesla CEO Musk has said that Model 3 can charge 215 miles (346 kilometers) at a time. Tesla also said that the Model S and Model X batteries have a minimum battery size of 60 kWh and the Model 3 battery pack is smaller.
Recently, Tesla CTO JB Straubel said in a speech: "When the density of the battery increases, the cost is also decreasing. This may not be intuitive. People don't realize it. When the capacity is high, the cost is almost the same. Weight is one thing. You can look at the raw material of the battery and see how much it weighs. The cost is determined by it."
The so-called "energy density" refers to how much energy the battery pack can store, which is closely related to the weight. As the energy density of the battery increases, more energy can be stored in a smaller volume. The lower the weight, the less material and the lower the cost. Shi Chaobao also said that there is no breakthrough technology in the battery, and Tesla and other companies have not relied on this breakthrough. In contrast, battery performance is steadily and steadily increasing, increasing by at least 5% annually.
Looking back at the performance improvement process of Tesla Energy Products, you can see how much progress has been made in the past few years. The Powerwall 2 and Powerpack 2 battery packs have an average weight per kWh that is lower than the previous product, but doubles in capacity.
As time goes on, the performance of the battery will continue to increase, and the Model 3's battery energy density will be higher than the Model S. Shi Chaobao claims that the energy density of Model 3 is 30% higher than that of the Model S primary battery.
“Every year, the performance of the battery is steadily increasing. The energy density represents the energy stored in a specific volume of battery. The annual energy density will increase by about 5%. Energy density may be one of the key indicators we care about.†Shi Chaobao said, “From Roadster Introduced to the Model S, the battery energy density has increased by about 40%, and when we designed the Model 3, it has increased by 30%. The performance of the battery is increasing every year."
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