Power lithium battery lamination process -Lithium - Ion Battery Equipment

Power lithium battery lamination process -Lithium - Ion Battery Equipment

"Recently, some soft-pack power lithium battery companies have begun to look for our company to develop a method of cooperating with the winding process." A senior executive of a winding equipment company revealed to Gaogong Lithium.

Gaogong Lithium has learned that in the field of power lithium batteries, the manufacture of soft-pack lithium batteries is mainly based on the lamination process. However, due to the shortcomings of the lamination process in terms of efficiency and integrated automation, the soft pack power lithium battery company has the idea of ​​shifting from the lamination process to the winding process.

The reason is that, with the advantage of high energy density, the penetration rate of soft-pack lithium batteries in the power market has risen rapidly. According to data from the Lithium Battery Research Institute (GGII) of the High-tech Industrial Research Institute, in the first quarter of 2018, the shipment of soft-pack lithium batteries was about 1.2GWh, accounting for 14% of the shipment, which was a substantial increase from last year. Lamination efficiency is not well suited to the needs of battery companies.(Lithium - Ion Battery Equipment)

Second, from the point of view of the reasons for choosing the winding process, whether it is semi-automatic or fully automatic winding, it can be completed quickly and with high quality, and the production control is relatively simple. At the same time, the subsequent slitting is convenient, and the qualified rate of the pole piece is high.

Third, the cost of the winding process is lower than that of the lamination process.

With the acceleration of the application of pouch lithium batteries in the power market, the solution of winding technology in the field of pouch power lithium batteries tends to mature, and the application of winding technology in the power pouch market may increase in the next two years.

However, in the long run, the battery of the soft pack lamination process is obviously superior to the winding process in terms of safety performance and energy density, and with the continuous innovation and progress of domestic lamination equipment companies and the horizontal extension of large lithium battery equipment companies, The lamination process will still be the mainstream trend of soft-pack lithium batteries.

Short-term turnaround of soft-pack lithium battery technology

On the one hand, it is due to the surge in market demand for pouch lithium batteries, and battery companies urgently need to improve production efficiency; will increase.

According to feedback from some domestic soft pack lithium battery companies, the current domestic shortcomings in the application of lamination machines are:

1. The equipment efficiency is slow. At present, the efficiency of the lamination machine industry is generally 0.8 seconds/piece, and there is still a big gap between the efficiency of imported lamination machines of 0.17 seconds/piece.

2. Alignment accuracy during folding. The lamination process is very cumbersome, and the qualified rate of pole piece cutting is very low. Each pole piece requires four knives. It is difficult to maintain a high degree of consistency in the quality of the pole pieces (section, burr, etc.) final performance.

3. The degree of automation of the production line is low. According to industry insiders, the integrated automation of the production line in the middle section is still low, and the integrated automation method is not mature enough.

4. The size of the equipment is too large. Many battery manufacturers expect the automated lamination machine to reduce the footprint by another 20%.

Regarding the transformation of the soft pack lithium battery process, a power lithium battery executive said that the lamination process and the winding process of the soft pack application have their own characteristics. The improvement of battery performance and energy density is even more excellent. At present, the company's soft-pack lithium batteries are manufactured by winding process and lamination process, which can be responded to and satisfied according to different markets and customer requirements.

Lamination process is still a long-term development trend

With the gradual increase of battery energy density requirements, battery cell companies have a tendency to make batteries larger and larger. The most important problems in single-cell expansion are safety, production efficiency, control of winding or stacking of pole pieces and separators, Production line collective efficiency and other issues.



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