What are the cylindrical lithium batteries?

　　Compared with the soft bag and square lithium battery, cylindrical lithium batteries are the earliest commercialization, the highest production automation, and the lowest current cost. At present, the market mainly includes 18650 cylindrical lithium batteries and 21700 cylindrical lithium batteries. Other common cylindrical lithium batteries are 14650, 17490, 18650, 21700, 26650, etc.

　　The cylindrical lithium batteries are divided into different systems of lithium iron phosphate, lithium diamond, lithium manganate, mangible manganese manganese, and three yuan materials. The shell is divided into two types: steel shell and polymer. Different material system batteries have different advantages. At present, the cylindrical cylindrical is mainly based on steel shell cylindrical iron phosphate batteries. This battery is manifested as high capacity, high output voltage, good charging and discharge cycle performance, stable output voltage, large current discharge, stable electrochemical performance, use of use, use Safe, wide range of work temperature, and friendly environment.

　　Circular lithium battery structure: The monomer is mainly composed of positive electrode, negative electrode, diaphragm, positive pole negative electrode, safety valve, overcurrent protection device, insulation and housing together. The shell, there are many early steel shells, currently the aluminum shell.

　　The design of each manufacturer is not the same. Depending on the safety requirements, the prices must be different depending on the safety requirements. General safety devices mainly include two categories: PTC positive temperature coefficient resistance and fuse device.

　　PTC, when there is a large current, the resistance is hot, and the temperature accumulation will promote the rise of the PTC resistance value. When the temperature exceeds one threshold, it suddenly increases, which is equivalent to separating the faulty cells from the overall circuit to avoid further heat out of control. happened.

　　The melting device is a melting in principle. When it encounters too large current, the fuse fuse, the circuit is disconnected.

　　The difference between the two protection devices is that the former can be restored. The protection of the latter is one -time. Once the failure occurs, the system must think that the problem of the problem battles can work normally.

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