What are the advantages and disadvantages of square lithium batteries?

Advantages: high reliability of prismatic lithium battery packaging; high system energy efficiency; relatively light weight and high energy density; relatively simple structure and relatively convenient expansion. It is currently an important option for increasing energy density by increasing the monomer capacity; Larger, the system configuration is relatively simple, which makes it possible to monitor the monomers one by one; another advantage brought by the simple system is that the stability is relatively good.

Disadvantages, because prismatic lithium batteries can be customized according to the size of the product, there are thousands of models on the market, and because there are too many models, the process is difficult to unify; the level of production automation is not high, and the monomer difference is relatively high. Large, in large-scale applications, there is a problem that the life of the system is much lower than the life of the monomer.

　　Comparison of cylindrical, square and soft pack lithium batteries

　　 1. Battery shape: The square lithium battery can be of any size, so it cannot be compared with a cylindrical battery.

　　2. Rate characteristics: the process limitation of cylindrical lithium battery welding multi-pole ear, so the rate characteristics are slightly worse than the square multi-pole solution

　　 3. Discharge platform: The same cathode material, anode material, and electrolyte are used, so theoretically the discharge platform is the same, but the internal resistance of the square battery is slightly dominant, so the discharge platform is slightly higher.

4. Product quality: the cylindrical process is very mature, the pole piece has a low probability of secondary slitting defects, and the winding process is more mature and automated than the lamination process. The lamination process is currently still using semi-manual methods, so for The quality of the battery has an adverse effect.

　　 5. Tab welding: Cylindrical lithium battery tabs are easier to weld than square lithium batteries, and square batteries are prone to false welding that affects battery quality.

　　 6. PACK group: Round batteries are relatively easier to use, so the PACK scheme is simple and the heat dissipation effect is good. The heat dissipation problem should be solved when the square batteries are PACK.

　　7. Structural features: The chemical activity at the corners of the square battery is poor, and the performance of the battery is significantly reduced after long-term use.

　　 Label: Automatic assembly line for square aluminum shell