On the 27th, Samsung SDI has decided to introduce a laminated production process to its Hungary factory next year. Only medium-sized batteries for electric vehicles will be produced at factories in Hungary.
Previously, the winding method was utilized. The winding is a technique that extracts battery material such as anode, separation membrane, and cathode material. A mixture of rolled materials is called a jelly roll. The jelly roll is put into a case, the electrolyte is injected, and the production process is finished through other processes.
The laminated method refers to the stacking of anode, electrolyte, separation membrane, and cathode material.
Samsung SDI has used the winding method for both small and medium batteries. Due to its relatively simple assembly process, it has high production efficiency. However, it is difficult to utilize 100% of the internal space of a battery, a little space is left in the corner. Repeated charging and discharging may also cause swelling of the material. The larger the battery capacity, the greater the problem. The longer the length of the jelly roll, the more interruption it may cause to the anode and cathode alignment. The defective rate increases. In order to solve this problem, one way is to attach two medium-capacity jelly rolls. However, this method is patent by GS Yuasa in Japan.
Stacking can prevent these problems, the problem of poor productivity. In order to utilize the stacking method for square batteries, one needs the notching equipment that stacks it to the capacity appropriately. The low production efficiency could be solved with the innovative notching equipment. The company is currently in discussion with acquiring the notching equipment from Phil Optics and the R2R: Roll to Roll equipment from PNT.
Samsung SDI's Hungary plant was completed in May last year and has been in operation since the second quarter. It is estimated that production capacity will increase to about 11 gigawatts (GWh) by 2020.