The winding structure is to roll the cathode sheet, separator, anode sheet and separator of the battery together like chewing gum through the winding of a fixed winding needle, and extrude them into a cylindrical or elliptical cylindrical or square shape. The wound electric core can form a hard shell cylindrical winding and a square winding.
In the lithium-ion battery cell assembly process, there are two main technologies: winding and stacking. These two technologies set up are always related to the below key technical points: Battery cell space utilization, battery cell cycle life, cell manufacturing efficiency and manufacturing investment. Overview 1. What is Winding Technology? 2.
When comparing winding vs stacking battery, the stacking process can give better play to the advantages of large electric cores, which is superior to winding in terms of safety, energy density and process control. In the future, the energy storage batteries will be mainly square stacking batteries.
Prismatic cell: Both stacking and winding processes can be used. At present, the main technology direction in China is mainly winding and is transiting to stacking. Cylindrical cell: As a mature product, it always with the winding process. 4. What are the benefits of lithium-ion battery cell that formed by stacking process?
From the inside of the cell, the winding corner of the winding process has radians, and the space utilization rate is lower. The stacking process can make full use of the battery space, and the energy density of the cell formed under the same volume of cell design is higher.
Although the stacking process will expand during the repeated use of the battery, in general, the expansion force of each layer is similar, so the interface can be kept flat. The plates at both ends of the winding are bent, the coating material will be greatly bent and deformed, and powder dropping and burrs will easily occur at the bending place.