All Things You Need to Know About 21700 Battery - DNK Power

1.1 Are Best for Early Stages of Electric Vehicles

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batteries with its characteristics of highly mature technology, a high degree of automation, guaranteed battery and lower costs (2Ah/USD/Cell) is the best choice to power electric vehicles in the early stages to make cost down.

and Size

However, Cell is very limited by its size volume, which is generally between 2.0-2.6AH/cell for mass production. At present, while there is a huge demand for more energy density for lithium battery, the current cell can’t increase much on capacity.

Related: Cylindrical / Batteries More Suitable For Electric Vehicles?

1.2 Upgrade the Model

There are mainly 2 Ways to increase the power density of the lithium battery :

#1: improving/changing the mechanism of the lithium battery material, which needs new material development and progress is slow.

#2: Changing its physical size or production process.

At present, without a huge breakthrough in battery materials, starting from the product design model, ie: increase in the battery “diameter and length” to achieve a higher capacity will be our final choice. The has completed its historical mission, the future of “XL” lithium battery model is now coming.

2. Battery Performance and Cost

2.1. battery energy density can be increased by more than 20%

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battery power density is better than batteries. According to the current disclosure of Tesla, under the existing conditions, the energy density of battery systems is approximately 20% higher than the 250WH to the original -300 Wh battery system. At the same time, according to the Panasonic lithium battery power test in monomer batteries, the bulk density of its 21,700 battery is significantly higher than that of the cell monomer.

Below is table for comparison of vs

Table 1: batteries and comparison

2.2. battery system cost down by about 9%

costs decreased by about 9%. According to Tesla, the battery information disclosed in the price, the 21,700 lithium battery system is expected to sell for $ 170 ., Compared to the price of  for $ 185, the price decline may be about 8.1%. system costs about 171 US dollars, MH, the transition to , the cost of the system can be about 9% of the decline, to 155 US dollars Zhn.

Samsung says that after switching to a new battery, the system can reduce the component and weight by 10% compared to the current battery. Thus, further reduction in the weight of the battery, the energy density of the entire machine will be partially updated.

2.3. But Why , not Other Types?

In comparison with other types of lithium ion battery cells, is of course not the best Performance ever battery cell, but it is the best choice for energy density and energy cost.The physical dimensions of the cylindrical cores increase not only the energy density but also the productivity coefficient of cyclic life. It is assumed that the capacity of 10% per liter, the life cycle will be reduced by a factor of about 20%, charge-discharge to reduce $, and the core will have about 20% temperature increase. If you continue to increase the Size, you will increase the risk of damage to safety.

Tesla Gigafactory

Discussion: Advantages and Disadvantages of Battery

In the economic aspect, the cylindrical core rises to the mature process of , and the cost is carried out in a prerequisite to guarantee a good product price and consistency. If the size is too large, security and manufacturability will shrink, leading to a larger cylinder of , , and therefore not large-scale to occupy the main cause of the market.

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