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Concentrate on technology iteration, the way of "new forces" attacking domestic equipment

Date:2021-01-19 Hits:
The demand for large-scale production efficiency and energy density improvement of lithium battery puts forward a new proposition for lithium battery equipment enterprises.

Taking power battery as an example, winding is one of the most important processes in lithium battery manufacturing. The core difficulty is how to ensure the quality of the battery, especially the safety and consistency, under high speed winding. Therefore, improving winding efficiency and stability is still the core pain point of winding equipment.

In the field of consumer batteries, the birth of some new processes and technologies also provides new development opportunities for lithium battery equipment enterprises.

GuangDong Sure Intelligent Technology Co.,Ltd. (hereinafter referred to as sunray intelligent) was established in September 2017. As a new entrant, it has developed core products applied in the field of digital batteries and power batteries, helping battery enterprises to improve product performance and reduce costs.

Solving the problem of laser cleaning of electrode plate

After years of development, digital battery is mature in manufacturing process, production line process and application market, and the overall development is relatively stable.

However, the arrival of 5g era, especially the requirements of mobile terminal customers to further improve the battery capacity and fast charging performance, has spawned some new technologies in digital battery manufacturing. Such as the use of laser cleaning machine in the middle of the electrode lug welding position paint removal process.

In the traditional manufacturing process of digital battery, the electrode lug is directly welded in the coating blank area after rolling and cutting. This process is not conducive to the improvement of battery energy density and the reduction of manufacturing cost.

The new process is to remove the coating layer in the middle of the electrode coating according to the given process size by laser, exposing the copper foil, exposing the metal conductive current collector in the middle, and making it meet the requirements of tab welding, so as to improve the energy density and foil utilization.

Laser cleaning machine is an innovative product under this new technology, which puts forward high requirements for cleaning equipment in terms of cleaning efficiency, accuracy, stability, dust removal, etc.


Laser cleaning machine

The pole ear laser cleaning machine developed by Sure intelligent has high cleaning efficiency and stable quality. The cleaning area is (0 ~ 20) mm * (0 ~ 50) mm, the dislocation of the front and back sides is ± 0.4mm, and the cleaning pole piece width range is 35mm-160mm.

At the same time, the high-speed working state is stable, and the positioning accuracy is less than 0.4mm; the double-layer guarantee mode of deviation correction and automatic position induction compensation is adopted to ensure the accurate cleaning position; the laser cleaning parameters / energy are monitored online in real time, and the equipment is simple, which is convenient for training and operation.

"All the lasers of the company are imported, the beam is stable and reliable, and the cleaning efficiency is high, so as to ensure that the pole piece cleaning is not damaged." Long Rongqing, the R & D director of sunray intelligence, told Gaogong lithium that in order to improve the energy density, the use of foil will tend to be thinner and thinner in the future, and the requirements for laser performance will be higher and higher. After cleaning, the light transmission and coating residue of the foil will be the improvement project of laser cleaning technology.

Because a large amount of dust will be produced in the cleaning process, it is difficult to control the dust. Therefore, in addition to the requirement of stable and reliable cleaning, how to achieve thorough dust removal is also the key.

According to sunray engineers, Sunray's new generation of intelligent cleaning machine adopts streamline arc transition design, which is directly printed by 3D technology after CFD fluid dynamics simulation. Compared with the traditional suction nozzle, the wind speed is higher and the dust removal effect is more obvious.

Sure intelligent believes that, driven by the improvement of terminal performance requirements in the downstream market and the improvement of competitiveness of battery enterprises, polar ear laser cleaning machine is expected to play a positive role in the field of high-end digital battery manufacturing.

It is understood that at present, Sunray intelligent laser cleaning machine has developed to the fourth generation and has been applied in batch in Huizhou Liwei, Weike technology, Hangzhou Wanxiang and other head digital battery enterprises.

Tap the potential of winding technology

Once upon a time, the domestic high-end winding machine market was mainly occupied by Japan's CKD, Kaido and Korea's koem, and the domestic winding equipment was once hard to rise by import.

However, driven by the rapid development of the downstream power battery industry, local winder enterprises have been constantly survival of the fittest after the baptism of fierce competition, catching up with and even surpassing the international first-class level in technology, and gradually expanding their market share in the high-end field.

At present, a number of outstanding representatives of domestic winding equipment have been produced in China, but Chinese equipment enterprises are still exploring the technology improvement of winding equipment.

Fan Zixiong, general manager of sunray, told Gaogong lithium that the company's winder has been upgraded to the third generation and is actively exploring the mainstream market.


Automatic winder


It is understood that speed sharp intelligent winding machine in the winding line speed, tension fluctuation, winding alignment and other aspects of performance have been upgraded.


Specifically, the winding speed can reach 3m / s, the winding head adopts direct drive structure and DD motor, the unwinding adopts high-power servo motor with rated speed of 5000r / min, and the optimal inertia ratio (1:3) is adopted.

In tension control, the voice coil motor and tension controller with high response performance are used to achieve closed-loop control, reduce the amplitude of tension fluctuation and improve the accuracy of tension. The tension fluctuation value measured at the customer's site is ± 3%. At present, the requirements of mainstream battery enterprises are within ± 5%, while the industry average water standard is about ± 5% - 7%.

Sului intelligent said that the lower tension fluctuation value of the company's winding machine is mainly due to the optimization of hardware and software algorithm of the equipment unit, which makes the winding performance more stable.

At the same time, the precompression springback space of the wound core is smaller, which indicates that the winding stress is smaller and more uniform, which is more helpful to improve the safety of the core.

The double closed-loop control is adopted for the electrode feeding rectification, and the high-performance CCD system is adopted to ensure the accuracy and reliability of the alignment detection. The cell alignment is less than ± 0.3mm.

In addition, the winder also adopts high-end motion control system, which is efficient and energy-saving. At the same time, it also solves some process pain points, such as the folding of polar ears and the cutting off of polar pieces.

It is worth noting that the full-automatic three needle cylindrical winding machine developed by Sunrui intelligent is also attractive.

Three position winding process, position conversion using servo drive divider, motion mode using cam drive structure, more accurate positioning, more efficient speed. The tension of diaphragm pole piece can be adjusted, the upper and lower diaphragms and positive and negative poles can be adjusted synchronously in the winding process, and the effective dust removal device is adopted after the pole piece is cut off, which effectively ensures the winding accuracy and product quality, and the operation is simple. The modular design also makes it more convenient and fast in maintenance, especially in replacing the needle.

From the operation data, the 18650 cell production speed of the full-automatic three needle cylindrical winding machine of Sunrui intelligent can reach 25-33pcs / min, and the 26650 cell production speed can reach 16-19pcs / min; the grain rate is more than 95%, and the yield rate is more than 99%.

In fact, on the basis of core products such as winding machine, Sunray also has the delivery capacity of 21700 automatic production line of cylindrical cells. The modular design is also adopted, and each functional module operates independently, which can ensure the output of the whole line to the greatest extent. In order to ensure the stable operation of the whole line, the core components of the production line are mainly imported, and the production efficiency can reach 80 PCS / min.

"At present, there is still room for further improvement in the performance of domestic winding machines". Despite the continuous efforts of independent innovation of some excellent equipment enterprises and the rapid iteration of automation and intelligent technology of domestic lithium battery equipment, fan Zixiong still thinks that the company's current focus is to strengthen research and development and continuously improve product performance.

On the one hand, the technological iteration of domestic lithium battery equipment brings more confidence to lithium battery enterprises; on the other hand, with the continuous innovation of battery technology, higher requirements are also put forward, which also means that the "new forces" of domestic equipment still have a long way to go.

Despite the fierce competition, I believe that new application requirements and technological breakthroughs will also bring a new round of market opportunities to other new entrants such as sunray intelligence.