Cylindrical lithium-ion batteries are the first commercialized lithium-ion batteries. Compared with pouch and rectangular lithium-ion batteries, they have the highest degree of automation and the lowest cost.
Currently, the market mainly has 18650 cylindrical lithium-ion batteries and 21700 cylindrical lithium-ion batteries. Other common cylindrical lithium-ion batteries include CR14505, 14650, 17490, 18650, 21700, and 26650.
Cylindrical lithium-ion batteries are divided into lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, manganese cobalt mixed material, and ternary system, and the shell is divided into steel shell and polymer shell. Different material systems of batteries have different advantages.
Currently, the important cylindrical body adopts steel-shell cylindrical lithium iron phosphate batteries, which have the characteristics of large capacity, high output voltage, good charge and discharge cycling performance, stable output voltage, stable electrochemical performance, safe operation, wide operating temperature range, and environmental friendliness.
The unit is mainly composed of positive electrode, negative electrode, separator, positive and negative current collectors, safety valve, overcurrent protection device, insulation, and shell. The shell, which was mostly made of steel in the early days, is currently mostly made of aluminum.
The design of overcurrent protection devices varies among manufacturers and can be customized according to different safety requirements and at different prices. Common safety devices include PTC positive temperature coefficient resistors and fuse devices.
When overcurrent occurs, the resistance heats up, and the accumulation of temperature promotes the rise of PTC resistor value. When the temperature exceeds the threshold, it will suddenly increase, which isolates the faulty unit from the entire circuit and prevents further thermal runaway.
In principle, a fuse is a fuse. When there is too much current, the fuse blows and the circuit is disconnected.
The difference between the two protection devices of lithium-ion batteries is that the former can be restored, while the latter is a disposable protection. Once a fault occurs, the system must consider replacing the problem unit to make it work normally.
HCB Battery Co., Ltd. was founded in 2004. As a leading manufacturer and solution provider of original lithium batteries domestically, HCB has always been committed to leading the R&D and manufacturing of all kinds of original lithium batteries. One notable example of our quality products is the ER17505 lithium battery, which exemplifies their industry-leading capabilities.
With every improvement, HCB continues to pursue perfection. Technical development and innovation are very important to HCB. For more than 17 years, we have been focusing on providing reliable original lithium batteries and services to customers worldwide. Welcome to consult us.