Comparative analysis of technical characteristics
1. Battery shape: Square lithium-ion batteries can be of any size, while soft-pack lithium batteries can be made thinner, which is incomparable to cylindrical batteries.
2. Rate characteristics: There are process limitations for welding multi-lugs of cylindrical lithium-ion batteries, so the rate characteristics are slightly worse than the square multi-lugs method.
3. Discharge platform: The same positive electrode material, negative electrode material, and electrolyte are used, so the discharge platform is theoretically the same. However, the internal resistance of the square battery has a slight advantage, so the discharge platform is slightly higher.
4. Product quality: The cylindrical lithium-ion battery process is very mature, the probability of common secondary slitting defects of pole pieces is low, and the winding process is more mature and automated than the lamination process. The lamination process is still using a semi-manual method. , so there is a negative impact on the quality of the battery.
5. Welding of tabs: The tabs of cylindrical lithium-ion batteries are easier to weld than square lithium-ion batteries. Square batteries are prone to false welding, which affects battery quality.
6. Pack into groups: Circular batteries are relatively easier to use, so the packing method is simple and the heat dissipation effect is good. When packing square batteries, the heat dissipation problem must be solved.
7. Structural features: The chemical activity of the corners of square batteries is poor, and the performance of the battery will decrease significantly after long-term use.
