Lithium battery lug basic knowledge
- Apr 11, 2018 -

Lithium battery lug basic knowledge

The lug is a raw material for lithium ion polymer battery products. The tabs are divided into three kinds of materials. The positive electrode of the battery uses aluminum (Al) material, the negative electrode uses nickel (Ni) material, and the negative electrode also has nickel-plated nickel (Ni-Cu) material, which are both composed of film and metal tape. to make. The film is an insulated part of the tab, and its function is to prevent the short circuit between the metal tape and the aluminum-plastic film when the battery is encapsulated, and the sealing is prevented by heating (about 140° C.) and the aluminum-plastic film hot-melt sealing when the package is sealed. Leakage.

A tab is sandwiched by two sheets of film. The films used in the market today are black, white and single-layer adhesives. The commonly used black film is a three-layer structure: melanin, melting point 66°C; PE, melting point 105°C; PP, melting point 137°C. The finished package of the tabs is divided into disc type (whole metal strips are passed through the equipment and the whole of the film is coiled into discs) and the plate type (the metal strips are added to the film and cut into individual ones, and then the rows are placed in two rows. Thin transparent plastic film sandwiched in the middle).

"Pole" refers to the "pole" in "positive electrode" and "negative electrode", and "ear" refers to the rubber strip used in "positive electrode" and "negative electrode", and is symmetrical on both sides of the metal ribbon like human "ear". The combination of function and image name, Taiwan called "extreme ear" as "lead" is similar to this name, the "shoulder height" and "shoulder width" commonly used in the industry can be considered as a continuation of the name "very". Subdivision, because "ear" is difficult to measure height and width, and "shoulder" is OK, so later did not name "height" and "shoulder width" as "ear height" and "ear width".

More precisely, the "tab" is a "connection, conductive, seal." "Connection" refers to the connection of the inside and outside of the battery, the connection between the lug rubber and the aluminum plastic film; "conductivity" refers to the electric lead out through the tab and the circuit; "sealing" means the seal between the rubber tape and the metal tape. The seal between the strip and the aluminum plastic film.

It is precisely because the “Fantastic Ear” is a localization in the true sense from the beginning. It is not a simple imitation (Sumitomo started from the automatic hot-roller-style ear, and the domestic is a manual plate-type hot-pressed ear). The automatic rolling tab is also a genuine localization of the tab device. The surface nano-chemical treatment of the tab metal strip, especially the nano-chemical treatment of the nickel tabular nickel strip, is also a domestic innovation, which forces Sumitomo. The ear ear had to learn and adopt it to the domestic ear ear. Although it was adopted, the surface treatment of the metal bar has not been well resolved. There is still a certain gap between this and the domestic ear.