Cylindrical lithium-ion batteries have batteries and lithium battery has become the most common lithium battery cells. And apply widely in different industry area.
With the rapid development of new energy vehicles in recent years, lithium batteries are also developed quickly. Lithium ion battery has always been an important field for new energy vehicles. Which kind of battery will be a major energy for vehicles?

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Lithium-ion batteries have a high energy density, and has a very low self-discharge rate. In addition, lithium-ion batteries with no 'memory effect' and no toxic substances, and these advantages of lithium-ion batteries make them widely used in new energy vehicles.

battery is a cylindrical battery model, specifically refers to: 21 ' refers to the cylindrical battery has an outer diameter of 21mm; With height: 70mm.

This is to adapt to the electric vehicle's longer-lasting mileage requirements, in order to improve the effective utilization of vehicle battery space, and developed a new model. The same material, compared to the common cylindrical lithium battery, capacity can be more than 35% higher.

Advantages of battery cell compared with

• battery cell capacity increased by 35%. Take tesla battery as an example, and When Tesla switch from the to the model, the battery capacity can reach 3 to 4. 8Ah, a significant increase of 35%.
• The energy density of the battery system is increased by about 20%. According to data disclosed by Tesla, the energy density of the battery system used in the early days was about 250Wh/kg, and later its battery system energy density was about 300Wh/kg, and the volume of the battery had a nearly 20% higher energy density than the original cell.
• The cost of the system is expected to fall by about 9%. According to a analysis of the battery price information disclosed by Tesla, the battery powered lithium battery system costs $170/Wh, while the battery system sells for $185/Wh. With the battery on the Model3, battery system costs alone can be reduced by about 9%.
• The weight of the system is expected to decrease by about 10%. The overall volume of is greater than , with the increase of monomer capacity, the single body energy density is higher, so the number of battery monomers required under the same energy can be reduced by about 1/3, in reducing the difficulty of system management will also reduce the number of metal structure parts and electrical accessories used in the battery pack, which further reduces the weight of the battery. After samsung's SDI switched to a new battery, it was found that the system was 10% lighter than the current battery.

Keep the advantages like high reliability and stable performance of the battery, the battery performance is much more improved over the in all aspects. In addition, compared to other battery models, lithium is similar to the more mature battery in terms of battery raw material selection, production process and technical processes. Therefore, the and production line can be mostly compatible, some enterprises more secure way is to do articles on the production line, the production line to and compatible close.

The pursuit of high-ratio energy has become an trends, many battery companies began to turn their attention to the layout of batteries. Some enterprises' production lines are imported by introduce more equipments, but they are assembled on their own, so they can invest less in the cost of to conversion.

At present, The most popular model like Sanyo , Sony battery vtc6a, Nitecore , Panasonic battery, LG , Inr M50. They are already for sale. And Coremax also get ready for battery packs.

panasonic battery

LG battery

• Cell Capacity:  mAh
• Max Continuous Discharge: 7.3A
• Cell Weight: 68 g
• Datasheet Download

sony

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1.1. Are Best for Early Stages of Electric Vehicles

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

For more information, please visit SINC.

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%

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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