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What Are the Advantages of the Lithium Battery Made By Auto Stacking Machine

Jun 15, 2022

What Are the Advantages of the Lithium Battery Made By Auto Stacking Machine


Advantages and disadvantages of the lithium battery made by the battery electrode stacking machine with the continuous expansion of the battery application field, after the size of the lithium-ion battery in the traditional structure is enlarged, some internal adverse reactions caused by the specific structure are also enlarged. At this time, there is an urgent need for a more optimized cell structure to meet the design requirements of the large capacity square battery. Compared with the traditional winding electrode structure, Its advantages are mainly reflected in the following aspects.


lithium battery electrode stacking machine


Battery performance:

1. Compared with the winding structure made by electrode winding machine, the stacked battery has better cycle characteristics, safety characteristics and energy density. The stacked battery has a uniform reaction interface. Due to the complex characteristics of the winding structure, there are many bending and thickness change areas in the length direction of the entire pole, especially the small angle bending area near the middle of the core and the fluid collecting welding area. Due to the uneven winding tension and shape change, it is easy to cause wrinkling and deformation of the diaphragm and the pole piece. The positive and negative poles cannot be effectively contacted, resulting in a reaction dead zone. During charging, the phenomenon of "lithium precipitation" occurs at the edge of the fold, resulting in insufficient reaction of the effective active substances of the battery, lower energy density of the battery and lower cycle performance of the battery. At the same time, it also causes great potential safety hazards. The stacking cell structure fundamentally avoids this problem, The bending area and thickness change area are reduced, the surface of the pole piece is flat, without the influence of tension in the length direction, the contact between the pole piece and the diaphragm is better, the interface reaction is uniform, the capacity of the active material is brought into full play, and the performance is fundamentally improved.


2. Compared with the winding structure, the stacking structure has more uniform current density, excellent internal heat dissipation performance, and is more suitable for high-power discharge.


Battery appearance:

1. Due to the influence of the winding tension and the particularity of the winding structure, the winding structure cell is prone to deformation and surface thickness change, which is also aggravated by the increase of the cell size. At the same time, the shrinkage and deformation of the material during the use of the battery will also cause certain thickness change, especially the aluminum-plastic composite film packaging battery, which is widely used at present, has poor strength of the battery shell, The change of internal shape causes the change of overall dimension, which affects the use and also brings certain potential safety hazards. The laminated battery does not have this problem.


2. In terms of appearance processing technology, it is more suitable for the production process of high-capacity single battery. The wound battery is mature and stable in the production process of small capacity and small size battery, with high efficiency and advantages. However, in the case of large-size pole piece winding, the process stability is not enough, that is, the higher the capacity, the larger the pole piece size, the worse the efficiency and stability of the winding process, while the stacking process is just the opposite, it is more suitable for the production process of large capacity and large area electrode.


Acey new energy specialized in various laboratory R&D lithium battery equipment for cylindrical cell, coin cell and pouch cell research.


battery electrode stacking machine





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