3.7V 18650 lifepo4 battery.Interpretation: Where do domestic lithium battery pack technologies still need to rely on imports?

Interpretation: Where does domestic lithium battery pack technology still need to rely on imports? Stimulated by policies and industrial prospects, the new energy automobile industry has attracted a large influx of capital. As an indispensable product in the chain, power lithium battery packs have begun to increase their production capacity. Rapid expansion.

Interpretation: Where does domestic lithium-ion battery pack technology still rely on imports? Stimulated by policies and industrial prospects, the new energy automobile industry has attracted a large influx of capital. Power-type lithium-ion battery packs are an indispensable product in the chain. Production began to expand rapidly. Our country can be said to be the most active region in the development of lithium-ion battery packs in the world. At present, the domestic lithium-ion battery pack special equipment industry has formed a certain scale, with more than 100 production companies. However, my country's lithium-ion battery pack technology and key raw materials still need to be developed. Rely on imports.


Although my country's lithium-ion battery market is booming, my country is not a lithium-ion battery powerhouse. At present, my country's lithium-ion battery pack industry has a structural overproduction problem, that is, insufficient high-end high-quality production and excess low-end production. Where does lithium-ion battery pack technology still rely on imports?


1. According to the classification of the production process of lithium-ion battery packs, lithium-ion battery pack equipment can be divided into front-end equipment, mid-end equipment and back-end equipment.


Front-end equipment: foreign equipment has the advantage
Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%

Charging temperature: -20~45℃ -Discharge temperature: -40~+55℃ -40℃ Support maximum discharge rate: 3C -40℃ 3C discharge capacity retention rate ≥70%
Click for details

Front-end equipment is the core equipment of battery manufacturing, which has a greater impact on the performance of battery cells and is the key to whether the product meets the standards. At present, most of the equipment is imported, and there are technical gaps in domestic equipment, including in terms of efficiency, accuracy, stability, etc.


Mid-range equipment: the center of competition for domestic and foreign equipment


Domestic equipment in the mid-range is replacing imported equipment, and some domestic equipment can already be compared with imported products. The automation rate of original equipment is increasing, and it is in the transition period from semi-automatic to single-unit fully automatic, such as winding machines. Pioneer Intelligence has entered the first echelon in the world. Due to the cost-effectiveness advantage, most battery manufacturers will choose domestic equipment, but larger battery manufacturers, such as BYD, CATL, etc., will still import some from Japan and South Korea.


Back-end equipment: Domestic equipment has the advantage


The back-end equipment is relatively simple and the technical requirements are not high. The gap between domestic and foreign countries is small, the degree of localization is extremely high, and more competition is concentrated among domestic brands.
Low temperature and high energy density 18650 3350mAh-40℃ 0.5C discharge capacity ≥60%

Charging temperature: 0~45℃ Discharge temperature: -40~+55℃ Specific energy: 240Wh/kg -40℃ Discharge capacity retention rate: 0.5C Discharge capacity ≥ 60%
Click for details

2. Gap in domestic lithium-ion battery pack separator technology


The separator is an important part of the lithium-ion battery. It is located between the positive and negative electrodes inside the battery, ensuring the passage of lithium ions while blocking electron transmission. The performance of the separator determines the interface structure, internal resistance, etc. of the battery, which directly affects the battery's capacity, cycle, safety performance and other characteristics. Excellent separators play an important role in improving the overall performance of the battery.


my country's lithium-ion battery pack separators have made major breakthroughs in dry process technology and now have world-class manufacturing levels. However, in the field of wet separators, domestic separator companies are limited by many factors such as process and technology. The product level is still low, and production equipment mainly relies on imports. There is a big gap between my country's separator products and foreign products in terms of thickness, strength, and porosity consistency, and product batch consistency also needs to be improved.


3. The gap between aluminum and plastic films for lithium-ion battery packs in my country


As the core material of soft-pack batteries, the production technology of aluminum-plastic film is much more difficult than that of separators, positive electrodes, negative electrodes, and electrolytes. It is one of the three high-tech technologies in the lithium-ion battery pack industry.


The performance gap between my country's aluminum plastic film and foreign products:


The surface stiffness of the aluminum foil is not enough, and the yield rate is poor;


The surface treatment process of aluminum foil is backward and pollutes a lot;


The water treatment of aluminum foil will cause "hydrogen embrittlement", resulting in poor disassembly resistance of the aluminum-plastic film;


When the surface of polypropylene and highly thermally conductive aluminum foil are combined, it is easy to curl and lamellar crystallization occurs;


Domestic adhesive formulation technology is poor and prone to delamination and peeling problems.


Due to the deficiencies in these production processes and technologies, the maximum penetration depth of aluminum-plastic film products produced in my country is around 5mm, which has never been able to meet good performance requirements. In foreign countries, it can reach 8mm, and some even reach 12mm. Overall, there is still a certain gap with foreign products; in terms of thickness, the thinnest domestic aluminum-plastic film can only be 70μm, and the mass-produced ones are 112, 88 and 72μm, while Japanese aluminum-plastic films The thinnest film can be 40μm, and 65 and 48μm can also be mass-produced.


4. The good news is that domestic lithium battery equipment has basically replaced imported ones.


In recent years, with the continuous improvement of the technical level of domestic lithium-ion battery pack equipment, my country's lithium-ion battery pack equipment has developed from mainly imported to domestically produced equipment. In 2016, foreign companies accounted for only 28% of the domestic lithium battery equipment market share. , the domestic production rate is as high as 72%. Compared with imported equipment, domestic manufacturers develop and manufacture specifically to meet the needs of my country's lithium-ion battery pack production technology, which has the advantages of strong adaptability, preferential prices, high cost performance, and more considerate services.


Our country's lithium-ion battery packs should continue to work hard on research and development in terms of technical materials, absorb advanced foreign technologies, and strive for an early breakthrough in material technology, rather than relying on foreign imports. In terms of the process performance design of the equipment, it is necessary to continuously meet the changes in new processes, new technologies and new developments of lithium-ion battery packs. my country's lithium-ion battery pack industry will sooner or later become the industry leader.