18650 rechargeable battery lithium 3.7v 3500mah
CH
About Us
Company Profile Development History Sales Network Partner Social Responsibility
Products
Rechargeable Battery Battery Packs Energy Storage Battery Primary Battery Handicraft Article
Subsidiary Company
SINO TECHNOLOGY SUNBEAM GREEN POWER DATAPOWER SEONG-HEE STD
Honor
Qualification Certificate Patent Certificate Honor Certificate
R&D
R&D Center Test Center
News
Company News Industry News
Contact Us
Other information
product
polymer lithium battery Primary battery Rechargeable Battery LR03 alkaline battery
18650 rechargeable battery lithium 3.7v 3500mah
18650 rechargeable battery lithium 3.7v 3500mah

Other information

Home  >  Other information

3.2v 25ah lifepo4 battery cell. Revealing the secret of international giant Celgard's “pressure box bottom” diaphragm technology

release time:2024-01-05 Hits:     Popular:AG11 battery

 

  Due to the characteristics of the materials themselves, wet separators and dry separators have their own advantages and disadvantages:

  Wet separators are light, thin and not easy to tear, but the melting point of PE is 135°C and are less safe than dry separators. In addition, the raw materials and production processes are different, and the overall cost is higher than that of dry separators; dry separators have a high melting point, heat resistance, It has better high pressure resistance and oxidation resistance, but is thicker than the wet separator and is easy to tear longitudinally, which requires higher process requirements for battery companies.

  With the rapid expansion of ternary power batteries, especially high-nickel power batteries, there is an urgent need for separators that combine the advantages of high safety, strong functionality, and low cost, and have become the direction for domestic separator companies to work together. The "three-layer composite membrane" developed by the international separator giant Celgard may be able to give some inspiration to domestic counterparts.

  The middle layer of Celgard's "three-layer composite film" is polyethylene, with a melting point of around 132°C. When the battery gets out of control and heats up, the polyethylene will melt, closing the pores and cutting off the circuit, which can form a safety protection for the battery; the outer two layers are polypropylene , has antioxidant properties and a melting point above 165°C. Even if the battery temperature rises slightly, the physical shape of the membrane will not be affected, providing a second layer of safety protection for the battery.

  In addition to high safety, Celgard President Shi Lie publicly stated that the dry process of the company's "three-layer composite membrane" product is more green and environmentally friendly than the wet separator.

  The wet process requires chemical solvents and solutions. Although manufacturers strive to recycle them, some will eventually evaporate into the air, which is harmful to people and the environment.

  Faced with the view of some people in China that wet separators have broader application prospects in the field of power batteries, Shi Lie disagrees. In his view, at the beginning of the rise of new energy vehicles, dry-process separators dominated the market because wet-process products have poor oxygen resistance and large lateral shrinkage; they melt when the temperature reaches 130°C, which has great limitations; in terms of strength, , the wet-laid separator has dropped by more than 50% after being used for a period of time, while the three-layer composite membrane has almost no change, and its life span is longer than that of the wet-laid polyethylene separator.

  Objectively speaking, after the wet separator is coated, it will effectively avoid the "defects" in the inherent characteristics of the material, but this will increase the cost.

  At present, most domestic ternary power battery systems use "wet method + coating". Due to cost considerations, dry process separators with gradually improved performance are widely used in lithium iron phosphate systems and have also begun to be used in ternary systems, and even some ternary systems. The leading companies in the Yuan system also use dry separators.

  At present, the proportion of high-nickel power batteries in the world is not high. Whether "wet method + coating" can simultaneously meet the requirements for high safety, strong functionality, and low cost separators remains to be further verified.

  Shi Lie said that the three-layer composite film is the only separator that can be used in high-energy batteries without coating, and directly using the base film will be more competitive than the polyethylene ceramic separator.

  "Different customers or different battery designs sometimes require us to apply another layer of ceramic, which will make the price more expensive." Shi Lie added that Celgard has many successful cases in Japan, South Korea and some Chinese battery manufacturers. Over the past many years, the market's feedback on CELGARD's "three-layer composite film" has been very good. Especially in electric vehicles and energy storage batteries, there has never been a safety accident, and its reliability is very guaranteed. We welcome more battery manufacturers to join us for more attempts and cooperation.

  Gaogong Lithium Battery learned that Celgard is the "originator" of the global dry separator process. It has a history of thirty or forty years in the separator industry and is now a subsidiary of Asahi Kasei. Most dry-process separator companies in China have followed Celgard's dry-process process, but what Chinese manufacturers have not yet been able to copy is the "three-layer composite membrane" developed and introduced by Celgard.

  “We started researching three-layer membranes a few years ago, but we did not have matching production equipment at that time, and one of the raw materials needed to be imported from abroad.” A senior executive of a domestic dry-process separator company said that most domestically produced double-layer membranes. Because 'it's not thin'.

  However, with the continuous improvement of raw materials, production equipment and process technology, some domestic dry process separator companies are trying to develop and launch three-layer composite membranes. Please pay attention to the follow-up reports of Gaogong Lithium Battery.


Read recommendations:

14500 600MAH 3.7V

What are the advantages and disadvantages of lithium iron phosphate batteries?lithium ion solar ener

AG Coin battery application

Ni-MH battery pack

3.7v 3000mah 18650 battery

Last article:3.2v 60ah lifepo4 battery.Renault-Nissan and Daimler are expected to cooperate in various aspects to

Next article:803040 battery.StoreDot develops self-driving electric vehicle battery that charges in just 5 minute

Popular recommendation

401030 lipo battery company

2023-03-22

26650 battery manufacture

2023-03-22

portable energy storage battery direct sales

2023-05-10

connector for energy storage battery manufacturer

2023-05-10

14500 battery company

2023-03-22

L1022 10A

2022-10-09

9V card-mounted carbon battery 6F22

2023-06-28

Lithium Battery LQ-1210

2022-08-19

Lithium Battery LQ-1212

2022-08-19

801538 480mAh 3.7V

2022-06-27

18650 1200mAh 3.7V

2022-08-19

18650 1200mAh 3.7V

2022-06-20

501825 180mAh 3.7V

2022-08-19

R6P

2022-07-01

7/AAA USB 1.5V 600mWh

2023-06-29

NiMH battery packs direct sales

2023-08-04

18500 battery

2023-06-25

Nickel Hydride Batteries

2023-06-25

1.2V NiMH battery

2023-08-04

18650 1800mah battery

2023-06-25

Cycle Life of Lithium - Ion Batteries

2025-03-22

New method of lithium battery explanation lithium battery maintenance

2023-02-10

What is the difference between lithium battery protection board and BMS (battery management system)?

2023-05-08

Lithium ion battery usage requirements

2024-04-07

Innovative Breakthroughs in High-Energy-Density Lithium Batteries

2024-11-06

Battery discharge by yourself.3.7V 18650 lifepo4 battery

2023-07-13

The process of customization of lithium battery custom manufacturers.home solar energy storage lithi

2023-04-08

Polymer lithium battery expansion

2022-12-08

Classification of electrolytes for lithium batteries.18650 li ion rechargeable battery

2023-07-07

How much battery power is left in the lithium-ion battery for mobile phone energy storage? Is the ch

2023-08-26
360° FACTORY VR TOUR
lithium ion battery 18650 priceWhatsapp
lithium ion battery 18650 price

lithium ion battery 18650 priceTel
+86 19925278095

lithium ion battery 18650 priceEmail
admin@sino-techgroup.com

TOP