Lithium battery pack structure principle -Lithium - Ion Battery Equipment

Lithium battery pack structure principle -Lithium - Ion Battery Equipment

The materials of lithium-ion battery packs are mainly composed of positive electrode, negative electrode, electrolyte, separator and outer shell.

① Positive electrode material---The positive electrode material accounts for 30%--40% of the cost of the lithium-ion battery. The performance of the positive electrode material directly affects the performance of the lithium-ion battery, and its cost also directly determines the cost of the battery. Using a carbon electrode that can absorb lithium ions, during discharge, lithium turns into lithium ions, detaches from the anode of the battery, and reaches the cathode of the lithium ion battery.

② Negative electrode material—The material selects an intercalable lithium compound whose potential is as close to the lithium potential as possible, such as various carbon materials including natural graphite, synthetic graphite, carbon fiber, mesophase spherical carbon, etc., and metal oxides.(Lithium - Ion Battery Equipment)

③ Electrolyte---Lithium-ion battery electrolyte is the carrier of ion transport in the battery. The electrolyte plays the role of conducting ions between the positive and negative electrodes of the lithium ion battery. The electrolyte plays the role of transporting charges between the positive and negative electrodes, which affects the energy density, power density, wide temperature application, and cycle of the lithium ion battery pack. life, safety performance and other factors.

④Separator---In the structure of lithium ion battery, the separator is one of the key inner layer components. The performance of the separator determines the interface structure, internal resistance, etc. of the battery. The use of polyene microporous membranes such as PE, PP or their composite membranes, especially the PP/PE/PP three-layer membrane not only has a lower melting point, but also has a higher resistance. The puncture strength is used for thermal insurance.

⑤ Shell---The shell of lithium ion battery mainly has two types: steel shell and aluminum shell. Using steel or aluminum material, the cover assembly has the function of explosion-proof power-off.

Lithium-ion battery pack structure:

Lithium-ion battery packs usually come in two shapes: cylindrical and square. The interior of the battery adopts a spiral wound structure, which is formed by a very fine and highly permeable polyethylene film separator material separated between the positive and negative electrodes.

The positive electrode includes a current collector composed of lithium cobalt oxide and aluminum foil. The negative electrode consists of a current collector composed of graphitized carbon material and copper foil. Lithium-ion batteries are filled with an organic electrolyte solution. In addition, a safety valve and PTC components are installed to protect the battery from damage when the battery is in an abnormal state and the output is shor



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