Cylindrical lithium battery is divided into lithium iron phosphate, lithium cobalt acid, lithium manganese acid, cobalt manganese mixed, ternary material system, shell is divided into steel shell and polymer two, different material system battery has different advantages. At present, the cylinder is mainly steel shell cylindrical lithium iron phosphate battery, the performance of this battery is high capacity, high output voltage, good charge-discharge cycle performance, stable output voltage, large current discharge, stable electrochemical performance, safe use, wide operating temperature range, friendly to the environment, Widely used in solar lamps, lawn lamps, backup energy, power tools, toy models.
Square type lithium battery usually refers to the aluminum shell or steel shell square battery, square battery penetration rate is very high in China, then, cylindrical lithium battery and square lithium battery comparison, what are the differences?
Cylindrical lithium battery and square lithium battery difference comparison
1. Battery shape: Square size can be arbitrarily designed, while cylindrical battery can not be compared.
2. Rate characteristics: the technological limitations of welding multipole ear for cylindrical battery, rate characteristics are slightly worse than square multipole ear battery.
3. Discharge platform: lithium battery using the same anode and cathode materials and electrolyte, theoretically speaking, the discharge platform should be the same, but the square lithium battery internal discharge platform is slightly higher.
4. Product quality: The manufacturing process of cylindrical battery is relatively mature, with low probability of secondary cutting defect of pole piece, and the maturity and automation degree of winding process are relatively high. The laminating process is still semi-manual, which has a negative impact on the battery quality.
5. Electrode lug welding: cylindrical battery electrode lug welding is easier than square lithium battery; Square lithium battery is easy to produce virtual welding and affect the battery quality.
6.PACK group: cylindrical battery is easier to use, so the PACK technology is simple, good heat dissipation effect; Square lithium battery PACK to solve the problem of heat dissipation.
7. Structure features: Square lithium battery has poor chemical activity at the edges and corners, and its energy density is easy to decay after long-term use and its battery life is short.
With the rise of power battery, car range and the contradiction between the battery capacity increasingly highlight, domestic power battery manufacturers use the battery energy density high aluminum square battery shell is given priority to, because the square cell structure is relatively simple, not like cylindrical battery as shell are made of high strength stainless steel and has explosion-proof safety valve such as attachments, So the overall accessory weight should be light, relatively high energy density.
