Advantages and disadvantages of 18650 lithium battery

18650 battery is cylindrical, the internal liquid, because battery design and materials, 18650 is suitable for high current, so almost all notebooks are designed with 18650 batteries, electric vehicles;Only super notebook, because energy saving, so can not use 18650 batteries and to use polymer lithium battery, especially the tablet PC, etc.;Digital camera flash for charging and discharging need big voltage and instantaneous electric current, so can only use 18650 similar battery, the volume is a little small;

Lithium polymer batteries, small size, large capacity, the disadvantage is that life is shorter than the 18650, because of using different design and material, some internal liquid, some are dry or is colloid, and large current discharge performance is better than 18650 cylindrical battery, so I need the large capacity electric equipment of small volume, often use lithium polymer batteries, the most typical is the performance of the mobile phone, tablets and other devices.

18650 the advantages of lithium battery:

1, large capacity,

18650 lithium battery capacity is 1200 mAh ~ 3600 mAh commonly between, and battery capacity of only 800 or so commonly, if combined into 18650Lithium battery pack, the 18650 lithium-ion battery pack is just can break through 5000 mAh.

2, long service life

18650 lithium battery service life is long and cycle life of up to 500 times more than normal use, is more than twice that of the ordinary batteries.

3, safety performance is high

18650 lithium battery safety performance is high, no explosion, not burning;Non-toxic, non-polluting, through the RoHS certification trademark;All the same safety performance, cycle number greater than 500 times;High temperature resistant performance is good, 65 - degree condition to devolve electricity efficiency up to 100%.In order to prevent the short circuit batteries, 18650 across the electrodes of lithium battery is separated.So it short-circuit phenomenon may have fallen to acme.Can be equipped with protective plate, avoid the battery overcharge, it also can prolong the service life of the battery.

4, high voltage

18650 lithium battery voltage is generally in 3.6 V, 3.8 V and 4.2 V, far higher than that of nickel cadmium and nickel metal hydride battery voltage is 1.2 V.

5, no memory effect

Before charging will not empty soc, easy to use.

6, small internal resistance,

The internal resistance of the polymer batteries is less than liquid batteries, domestic the internal resistance of the polymer batteries can even do below 35 m Ω, greatly reduced the battery power consumption, extend the standby time of mobile phone, can reach with international level.The support of large discharge current polymer Li-ion battery, the ideal choice of remote control model to become the most promising alternative products of Ni-Mh batteries.

7, series or transmitte synthesis 18650 lithium-ion battery pack

8, wide range of use

Laptops, walkie-talkie, portable DVD, instruments and meters, audio equipment, model aircraft, toys, video cameras, digital cameras and other electronic equipment

As an important of the family of lithium battery, 18650 batteries in the early years have been widely used in consumer electronics products.In recent years, with the rise of the strength of the new energy vehicles, 18650 battery also begins to be applied to new energy automotive industry.

Get rid of the old Tesla, currently including porsche and domestic Jianghuai, Zhongtai, Changan, Guangzhou have also joined the 18650 battery models such as research and development team.The personage inside course of study says, the future will have more models "crush on" 18650 battery, drive the 18650 battery using disruptive changes in the way.

18650 battery

"Japanese manufacturers in the production process of 18650 batteries on accumulated lots of experience, it produced 18650 batteries on the consistency and security have reached a higher level, industry called 'benchmarking'."Luo Huiming, deputy secretary-general of China vehicle industry technology innovation alliance, this is the main reason why tesla would choose Japan 18650 battery.

Guangxi zhuo can new energy technology co., LTD., general manager of Deng Guan hao also noted, "as a result of the 18650 battery production automation degree is high, better stability, replaceability is high, 18650 battery in the system development of modularization and standardization degree has the unique advantages of incomparable.Can effectively reduce the production cost, save Labour ".

Energy density, the ModelS are using 3.1 Ah, the energy density of about 252 wh/kg 18650 batteries.Toyota soft package used in the Leaf cell is 33 ah, monomer battery energy density of 150 wh/kg.It is obvious that 18650 batteries in terms of energy density, better than soft package of battery.As a result, 18650 especially when used in micro small electric vehicle batteries, has a great advantage.

The advantages and disadvantages of 18650 lithium batteries

The characteristics of the micro small electric vehicles is small size, flexible design, low price."18650 battery characteristic is high energy density, a single small volume, low cost."Sun Liqing, a professor at the university of Beijing institute of technology, said the 18650 battery for mini electric vehicles can be implemented in a small space more load, to maximize the use of, the next 18650 battery will get a better application in the field of micro small electric vehicles, share will be greater and greater.

Deng Guan hao also told reporters, zhuo to new energy sources will start mass production in the second half of this year 2.9 Ah 18650 battery.

However, everything has its duality, advantages and disadvantages coexist is normal things.18650 battery besides has the advantages, its disadvantages also cannot be ignored.

"Power battery in the process of operation, to achieve safety standards, battery management system plays an important role.18650 battery is its single biggest defects battery capacity is low, generally at about 2 ~ 4 ah, so very much, the number of batteries needed for battery management more complex."Sun Liqing mentioned, this leads to 18650 battery cooling need thermal management system, due to the monomer internal temperature difference is small, the battery temperature should keep in appropriate range relatively difficult.

However, tiny electric power requirement between 10-20 KWH, the demand for 18650 battery between 1000-1000, for the battery system assembly, the test of the connection is not big, there have been several domestic 18650 battery systems integrators, can meet the needs of customers.At the same time, due to the passenger cars series number is less, so it is relatively easy to manage.

Passenger cars, Tesla motors need 7000-7000 only 8000 battery reliably connected ChengMo group, "Tesla was nearly 8000 only dare to use 18650 batteries connect ChengMo group, mainly based on good quality batteries and incomparable welding technology."Think Deng Guan hao, 18650 battery is defective, but does not hinder it into power battery family.

For power battery, in addition to safety, energy density, range, there is a very important evaluation criteria, the service life cycle.From the point of test data, 18650 the service life of the cell cycle is generally between 500 ~ 1000 times, for 2000 times compared with the soft package of battery is lower, to some extent, limits the 18650 battery application range.

In a dispute over to go on

Among all kinds of 18650 batteries, a top shipments of products is 2.2 Ah, accounting for about 40% of total shipments to 18650 batteries.Thanks to the rapid development of new energy vehicles, more than 2.6 Ah 18650 battery shipments gradually increased to about 40%, become the "new forces" 18650 battery sales.

At present, the domestic enterprises with 18650 battery main can foster, Zhuo, Bick, Lishen, major foreign 18650 battery companies such as Samsung, Panasonic, LG chem.And, according to the related data in 2015, South Korea Samsung annual capacity up to 700 million, Japan Panasonic capacity nearly 300 million only, and can foster and companies such as annual capacity are less than 100 million only.

Aimed at the status quo, explained Deng Guan hao, "China's 18650 battery capacity is less than South Korea and Japan, the main reason is that 18650 batteries in China started late, development is relatively slow.Although the current domestic capacity, but because of the new energy industry continue to hot, 18650 battery market popular is only a matter of time, after all, it provide more choice for new energy vehicles.

At the same time, a large number of vision of the listed companies in 18650 battery industry, there are 5 listed companies in 2015 alone "" for transfers-will to 18650 battery.According to statistic, 5 listed companies a total investment of 6.558 billion yuan, is brought into 18650 battery industry "arm".At the same time, the enterprise within power battery in 18650, is more evidence of 18650 battery market prospect.

Despite the prospect, but have to mention is that at present, power lithium battery industry has formed the competitive situation of tripartite confrontation of China, South Korea, Japan, the three national output accounts for more than 90% of global production.But China's battery production technology level is still far behind Japan and South Korea, really can produce high quality products are numbered.

"18650 domestic battery industry is in a" malaise "situation.First of all, the competition from other cells, such as square, soft bag, etc.;Second, competition from foreign 18650 battery market, such as South Korea's Samsung, Japan Panasonic, etc., the market environment is not so optimistic."Deng Guan hao told reporters.

The personage inside course of study says, although the investment of 18650 battery enterprises continue to increase, but most of the really not for their own battery according to the requirement of the whole vehicle performance optimization has been used, and the micro electric vehicles for the requirement of the battery has yet to specific quantitative indicators, it also brought 18650 battery to promote a great challenge.

Fortunately, the new energy automobile production enterprises and products access management rules (revised edition) "the new energy vehicles recommended directory and the auto motive battery specification conditions (hereinafter referred to as the" standard conditions ") together, has entered the new energy vehicles recommended directory models, must also conform to the standard conditions of form a complete set of power battery, to achieve national new energy vehicles subsidies.

For this policy, Sun Liqing interpretation way, "which means" standard conditions "will be compulsory standards, this change will increase 18650 battery industry admittance threshold, forcing enterprises pay attention to 18650 battery production scale and improve quality."The future of those small size or low performance-to-price ratio 18650 battery enterprise, will face eliminated or face an acquisition integration.

"18650 battery is not bad, compared polymer battery.There are still a lot of advantages.Only the battery safety and stability of the domestic manufacturers produced more bad, do the title is broken.Future domestic 18650 battery is under array or, depending on China's 18650 batteries can be self improvement."Luo Huiming finally added.

The page contains the contents of the machine translation.