Game between 21700 and 18650 Batteries, 21700 Raises the Wave of Battery Product Change

IEC international standards

A generic battery industry field is a kind of IEC international standards. The IEC (international electro technical commission International Electrical Commission) in order to promote the standardization in the field of electrical and electronic and formulated the IEC standard battery.IEC61960 is aimed at performance indicators of lithium-ion battery batteries and battery parameters (including capacity, circle, internal resistance, etc.) to specification standards.

According to the IEC61960 standard, batteries, lithium-ion batteries model identification is mainly composed of the following parts:

The first part (three letters) :

The first letters of battery cathode materials. I said with a built-in lithium ion battery, L said lithium metal electrodes or lithium alloy electrode.

The second letter said the positive main active material of the battery. C said based on cobalt electrode, N based on nickel electrode, M said manganese based electrode, V based on the electrode of vanadium, and T based on titanium electrode.

The third letters shape of the battery. R says cylindrical battery, L said square battery.

The second part (5/6 digits) :

Cylindrical battery letters followed by 5 digits represent the dimensions, the former two representative circular diameter (mm), two middle height (mm) * 10 on behalf of the battery, the last one doesn't have a meaning of 0.When the above any specification > = 100 mm, add "/" between two Numbers.Common models such as 14500146 50174 90185 00186 50265, 00.

Common cylindrical batteries specifications: 186502200 mah3. 7 v, sanyo 186502500 mah3. 7 v.

Square battery letters followed by 6 Numbers, also on behalf of the battery size, two representative before battery thickness (mm), width (mm) between the two is battery, the last two to battery height (mm).When the above any specification > = 100 mm, add "/" between two Numbers; When the above any specification < 1 mm, add the letter "t" in front of the size, and to extend the unit 10 times. Common brick, sanyo square batteries specifications: 063450 a1200mah3. 7 v, sanyo UF103450P1880mAh3. 7 v.

Square battery in the specifications can add A letter, said the battery material, S on behalf of the steel shell, A representative aluminum shell.

Finally, to add a digit, said parallel battery monomer amount, if 1 is not displayed.

˙ ICR18650 model said: cylin drical Lithium ion batteries, the positive main material for cobalt, 18 mm in diameter, height 65 mm

˙ ICR20/1050 model said: cylindrical lithium-ion batteries, the anode materials for cobalt, 20 mm in diameter, height 105 mm

˙ ICP063048S models represent: square secondary lithium ion battery, the positive main material for cobalt, thickness of 6 mm, width is 30 mm, height of 48 mm, S on behalf of the steel shell

˙ ICPt733448 model said: square secondary lithium ion battery, the anode materials for cobalt, thickness of 0.7 mm, width is 34 mm, 48 mm in height.

The characteristics of the different shape of the battery

Cylindrical battery is one of the most ancient form, its advantages include mature production technology, product yield is high, the battery structure stability, wide scope of application, comprehensive performance is outstanding, the overall cost advantage. Its shortcomings are obvious, cylindrical steel shell or aluminum shell encapsulation, commonly used batteries will be heavier, than energy is relatively low. And security is poorer, short life cycle of battery. And because the small size can be used in a lot of scope.

As the power battery, square battery in the domestic application of penetration is higher and higher. And compared with the cylindrical battery, square cell structure is simple, the weight is lighter than energy is higher. Because the square can customize size according to the demand, so the market model is more, process is very difficult to unity, is a challenge for the cost.

Soft package are still on the market the battery, soft package battery compared with cylindrical and square, is because of its outer packing materials for aluminium, will blow up and will not explode, therefore, safety performance is better, but also lighter weight. Its shape can customize according to the demand, can be ultra-thin, can also make it square or triangular cylindrical, etc. Another soft package battery capacity bigger and smaller resistance, longer life, generally mild package battery performance is better. But soft package battery current model is less, high development costs.

21700 and 18650 game of the battery

In accordance with the national standard GB/file of the latest T34013-2017 "electric car with size of power battery products, continue to use IEC for battery size models of naming, specifies the general requirements for battery product size specification", "size tolerance requirement" and "requirements" size range, including cylindrical cell size 18650, 21700, 26650, 26700, 32700 and 32134, etc; Square cells have a variety of different sizes from 65 mm to 65 mm.

In order to improve current density and reduce the number of batteries and battery system energy and to reduce costs, whether it be a square, cylindrical or soft package a monomer batteries for battery size the trend of escalation. Obvious is that the current cylindrical batteries appeared 18650 to 21700/26650 upgrade phenomenon.

18650 and 21700 are the two mainstream models. New 21700 has four significant advantages:

(1) monomer battery capacity increase of 35%.Tesla 21700 battery production, for example, after the switch from 18650 to 18650 models, battery monomer battery capacity can reach 3 ~ 4.8 Ah, soared 35%.

(2) battery system improve the energy density of about 20%.Stella disclosure of data, the early use of 18650 battery energy density of about 250 WH/kg, then the production of 21700 battery energy density in 300 WH/kg, the volume of 21700 battery energy density nearly 20% higher than the original 18650.

(3) the cost of the system is expected to decline 9%.From the Tesla revealed the battery price information analysis, 21700 battery Power lithium battery/ WH system at a price of $170, and 18650 battery systems for $185 / Wh. Used on Model3 after 21700 batteries, battery system cost can only drop nearly 9%.

The weight of the (4) the system is expected to drop 10%.Comprehensive above shows that the overall volume is larger than 18650, 21700 capacity improvement as the monomer, monomer energy density is higher, so under the same energy needed for the number of monomer battery can reduce 1/3, while decrease the difficulty of system management will also reduce the battery pack using the number of the metal structure and electrical fittings, which further reduces the weight of the battery. Samsung SDI to switch to a new 21700 batteries, discovery system 10% less weight than the current batteries.

Keep the type 18650 battery has high reliability and stable performance, 21700 battery performance in various aspects have larger than 18650.In addition, compared with other battery model, 21700 from the battery material selection, production technology and technical flow, etc., and all 18650 battery similar technology is relatively mature. So most of the production line can be compatible with 18650 and 21700, some companies more reliable method is on the production line, the production line to close on 21700 and 18650 compatible. Some enterprise production line imported from abroad, but are themselves on the assembly, so can spend less cost to realize the transformation of the 18650 to 21700.

21700 change wave lift battery products

18650 is the earliest developed by Japan's SONY, in order to save costs and set a standard of lithium ion battery model.18650 as a traditional battery batteries, technology is mature, the manufacturer is more, strong suitability, can be in 3 c digital, unmanned aerial vehicles, electric tools, and other fields to digest .As the new energy vehicles, power battery become battery enterprise focus.

Tesla in the production of electric cars, when only 18650 battery, but not 18650 batteries for power battery. In 2008, Tesla first models with Panasonic, by 18650Cobalt acid lithium batteries As the power battery. Announced on January 4, 2017, Tesla and Panasonic joint research and development of the new 21700 batteries start mass production, and to emphasize this is current production battery energy density in the highest and the lowest cost.

On January 9, 2017, Samsung SDI in Panasonic after releasing the same specifications of the battery, 21700.LG will also said 21700 battery production in 2021.

The 21700 battery product reform to upsurge, research and development of enterprises at home and abroad are flocking to production:

1.bak battery:

18650-2.75 Ah power battery energy density batteries has reached 240 WH/Kg, is committed to research and development of high-energy than 21700 cylindrical batteries, power batteries. Is now have the ability to mass production and in 2018 is expected to achieve mass production.

2. Million weft lithium can:

On June 28, 2017, 4 compatible, annual production capacity of 3.5 21700 and 18650 GWH of fully automated production line was completed and put into operation, this is the domestic first 21700 battery production line, this marks a cylindrical battery formally entering 21700 age in China.

3. Jiangsu lishen:

As leading enterprises of lithium ion battery, lishen on technologies and products still have quite competitive, and 2015 through large-scale supply Jianghuai cylindrical woti-meeting momentum 18650 three Yuan batteries. On July 20, 2017, announced its 21700 formally put into production of production line, this is the first domestic production line for 21700 product customization.

4. The energy of wisdom:

Three Yuan 18650 type lithium batteries for capacity exceeds 3 GWH, 2017 key layout type 21700 batteries, the construction of six new automatic production line, 21700-5 ah 21700 total planning scale of 7 gw. Has new energy smart car enterprises and domestic mainstream form matching relations of cooperation, and continuously expand strategic customers emerging Internet car companies, etc.

5. The lion technology:

In ZhaoAn production base to realize the first production line smoothly, after 18650, the company developed the 21700 type cylindrical batteries on research and development strength. On August 16, 2017, the lion technology 2 gw capacity 21700 battery production line to start building, all reaches producing is expected in the first half of 2019.

6. Intellectual Hangxin energy:

Upgrade of the existing 18650 batteries production line, and has developed 21700 lithium-ion batteries and related production conditions, according to the actual situation of the market in 21700 lithium batteries.

7. Chong Ming new energy:

The earliest batch loading one of the three Yuan 18650 battery production enterprises, power battery car companies have many superior qualifications of cooperation. According to previously reported company in early 21700 product research and development, has already begun its 21700 production line are testing phase.

8. Day peng energy:

Is expected in 2018 the company about 6 GWH can output will reach.No.2 production base configuration of equipment is compatible with 21700 type products, which can realize the type 18650 and type 21700 arbitrary switching, the energy density of 200-200 WH/Kg.

9. Day I new energy:

Company's 18650 battery is mainly used for "held high" two fields, "high" means similar to Tesla's high-end passenger car;"Low" refers to the 100000 Yuan of the following mini, logistics vehicles, etc. It is understood that the battery has 2, 21700 are expected to formally put into production in 2018 years, single battery capacity 4.5 Ah.

10. The wooden new energy:

According to the report has been successfully production 21700 battery.

11. Anhui ty can:

Published last year produces 5 billion power battery 5 billion investment planning and construction.

12. Hengdian east magnetic:

Became involved in power battery industry since 2016, the production of major power battery for 18650 type, program beginning in the second quarter of 2018 to 2018 the layout of the battery.

13. Zhuo new energy:

One of the leader in the field of digital 18650 giant, its product is unanimously recognized the oems. Zhuo said new energy future will positively to 21700 battery production line layout, so as to adapt to the changes in the lithium electricity market.

14. Hai sida:

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