11

2020

-

05

Main types of lithium-ion batteries

Author:



According to the different electrolyte materials used in lithium-ion batteries, lithium-ion batteries are divided into liquid lithium-ion batteries (Liquified Lithium-Ion Battery, referred to as LIB) and polymer lithium-ion batteries (Polymer Lithium-Ion Battery, referred to as PLB).

Lithium-ion battery (Li--ion)

Rechargeable lithium-ion batteries are currently the most widely used batteries in modern digital products such as mobile phones and laptops. However, they are relatively delicate and should not be overcharged or overdischarged during use (the battery will be damaged or scrapped). Therefore, there are protective components or protective circuits on the battery to prevent expensive battery damage. Lithium-ion battery charging requirements are very high, and the termination voltage accuracy must be ensured within ±1%. Major semiconductor device manufacturers have developed a variety of lithium-ion battery charging ICs to ensure safe, reliable, and fast charging.

Mobile phones basically use lithium-ion batteries. Proper use of lithium-ion batteries is very important to extend battery life. It can be made into flat rectangular, cylindrical, rectangular and button-type according to the requirements of different electronic products, and has a battery pack composed of several batteries connected in series and parallel. The rated voltage of lithium-ion batteries, due to changes in materials, is generally 3.7V, and the positive electrode of lithium iron phosphate (hereinafter referred to as iron phosphate) is 3.2V. The termination charging voltage when fully charged is generally 4.2V and 3.65V for phosphorus iron. The terminal discharge voltage of lithium-ion batteries is 2.75V ~ 3.0V (the battery factory gives the operating voltage range or the terminal discharge voltage, each parameter is slightly different, generally 3.0V, phosphorus iron is 2.5V). Continuing to discharge below 2.5V (phosphorus iron 2.0V) is called over-discharge. Over-discharge will damage the battery.

Lithium-ion batteries with lithium cobalt oxide type materials as the positive electrode are not suitable for high-current discharge. Excessive current discharge will reduce the discharge time (higher internal temperatures will be generated and energy will be lost), and may be dangerous; but lithium iron phosphate The cathode material lithium battery can be charged and discharged with a high current of 20C or more (C is the capacity of the battery, such as C=800mAh, a 1C charging rate means the charging current is 800mA), and is particularly suitable for electric vehicles. Therefore, the maximum discharge current given by the battery production factory should be less than the maximum discharge current during use. Lithium-ion batteries have certain temperature requirements. The factory provides charging temperature ranges, discharge temperature ranges and storage temperature ranges. Overvoltage charging will cause permanent damage to lithium-ion batteries. Lithium-ion battery charging current should be based on the battery manufacturer's recommendations and requires a current-limiting circuit to avoid overcurrent (overheating). The commonly used charging rate is 0.25C~1C. When charging with high current, it is often necessary to detect the battery temperature to prevent overheating from damaging the battery or causing explosion.

Lithium-ion battery charging is divided into two stages: constant current charging first, and changing to constant voltage charging when it is close to the end voltage. For example, a battery with a capacity of 800mAh has a charge termination voltage of 4.2V. The battery is charged at a constant current of 800mA (charge rate 1C). At the beginning, the battery voltage increases at a large slope. When the battery voltage is close to 4.2V, it is changed to 4.2V constant voltage charging. The current gradually decreases and the voltage changes little. When the charging current drops to 1/10-50C (the settings vary from factory to manufacturer and does not affect use), it is considered to be nearly full and charging can be terminated (some chargers start the timer after reaching 1/10C. After a certain period of time, end charging).

21

2020-04

Certifications

Our company has an excellent marketing team, scientific operating mechanism, complete internal management procedures and strict rules and regulations. Now we have advanced production equipment, exquisite production technology, strong technical force, perfect quality assurance system and pre-sales and after-sales service system.

21

2020-04

R&D strength

A high-tech enterprise focusing on the integration of new energy product R&D, manufacturing, brand promotion and operations, always keeping pace with the world's leading technology and management. Now it has developed more than 10 series of more than 100 well-known brand products such as lithium-ion battery packs, 18650 lithium batteries, nickel-metal hydride batteries, alkaline batteries, polymer lithium batteries and mobile power supplies. The company's products have excellent performance and good consistency. They are not only in a leading position in the country, but also reach the world's leading level.

21

2020-04

The lithium battery industry can still expect high growth in the next few years

Li Zhenqiang, CEO of Qidian Research, said at the meeting that from the perspective of China’s lithium battery competition landscape, industry concentration is far lower than abroad. In 2015, the global market concentration rate of the top 10 Chinese lithium batteries was 44.4%, and only one of the top 10 companies was not involved in power batteries. Li Zhenqiang predicts that China's lithium-ion battery market will reach 96.11GWH by 2018, with a compound growth rate of 25% in the next three years, EVs will maintain a compound growth rate of more than 40%, and the ESS market is expected to explode in 2018.

21

2020-04

Decoding the pros and cons of overseas Taobao for Chinese lithium battery companies

In 2017, Wanxiang A123 won a new order from SAIC General Motors worth over US$1 billion for its owner, involving 2.6 million sets of 48-volt super lithium iron phosphate batteries.

21

2020-04

Where is the energy storage battery?

For all intents and purposes, Aquin Energy seems destined to succeed. The emerging startup, which sells high-capacity energy storage batteries to renewable energy projects and grids, was founded in 2007 by Jay Whitacre, a materials science professor at Carnegie Mellon University. , once developed batteries for NASA’s Mars rover. Aquin Energy has raised nearly $200 million from high-profile investors including venture capitalists including Bill Gates, Kleiner Perkins and Shell. Perhaps most importantly, when the company first entered the market, it was clearly and keenly aware of the biggest problem of previous battery project startups-it was difficult to avoid the use of rare materials. With lessons learned from the past, Aquin Energy relied more on production equipment that had changed its original purpose and determined the possible market profit direction.

21

2020-04

More than 5 power battery companies are involved in upstream lithium mines

On the demand side, according to data from the China Geological Survey, the annual production of 2 million new energy vehicles will be achieved by 2020, and the consumption of lithium products will reach 80,000 to 100,000 tons of lithium carbonate equivalent, exceeding the national lithium product consumption in 2015. Under the premise that demand in other fields remains unchanged, the development of the new energy vehicle industry will lead to an average annual demand growth rate of 10% to 15%. It is expected that lithium demand will reach 150,000 tons of lithium carbonate equivalent in 2020.

11

2020-05

Warmly celebrate our company's successful passing of ISO9001 quality management system certification

Warmly celebrate our company's successful passing of ISO9001 quality management system certification

11

2020-05

Super battery/graphene battery is not the best yet. Take stock of 12 new battery technologies

A battery is a device that converts energy produced by chemical reactions directly into electrical energy. It has the characteristics of stable voltage, stable current, stable power supply for a long time, little influence from the outside world, simple structure, easy to carry, simple and easy charging and discharging operations, stable and reliable performance, and brings a lot of convenience to modern social life.