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Cylindrical lithium-ion batteries are divided into three different systems: lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, cobalt manganese mixture, and ternary materials. The outer shell is divided into two types: steel shell and polymer. Different material systems have different advantages for batteries. At present, cylindrical iron phosphate lithium-ion batteries with steel shells are the main type of batteries. These batteries have high capacity, high output voltage, good charge discharge cycling performance, stable output voltage, ability to discharge large currents, stable electrochemical performance, safe use, wide working temperature range, and environmental friendliness. Widely used in solar lighting fixtures, lawn lighting fixtures, backup energy, electric tools, and toy models.

A typical cylindrical battery structure includes: positive electrode cover, safety valve, PTC element, current cut-off mechanism, gasket, positive electrode, negative electrode, isolation membrane, and housing.

Comparison between cylindrical lithium-ion batteries and square lithium-ion batteries

Battery shape: Square lithium-ion batteries can be of any size, so they cannot be compared to cylindrical batteries.

Ratio characteristics: Due to the process limitations of welding multipole ears in cylindrical lithium-ion batteries, the ratio characteristics are slightly inferior to those of square batteries.

Using the same positive electrode material, negative electrode material, and electrolyte, the theoretical discharge platform is consistent, but the internal resistance of square batteries is slightly superior, so the discharge platform is slightly higher.

Product quality: The cylindrical lithium-ion battery process is very mature, and the probability of secondary cutting defects in the electrode is low. In addition, the winding process is more mature and automated than the stacking process, and the stacking process is still using semi manual methods. Therefore, there are adverse effects on the quality of the battery.

Pole ear welding: The pole ear of cylindrical lithium-ion batteries is easier to weld than that of square lithium-ion batteries, and square batteries are prone to virtual welding, which affects battery quality.

PACK grouping: Cylindrical batteries have a relatively easier to use feature, so the PACK method is simple and has good heat dissipation effect. When packing square batteries, it is necessary to solve the problem of heat dissipation.

Structural characteristics: The chemical activity energy at the corners of the square lithium-ion battery is poor, and the performance of the battery decreases significantly after long-term use.

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