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The tabs constitute the raw material for soft-packaged lithium-ion battery products. Many scenes in life will be applied, for example, when we use many digital products, we need to use tab materials.
The battery is divided into a positive electrode and a negative electrode. The ear electrode is led from the positive electrode and the negative electrode of the battery to the metal conductor. Generally speaking, the positive electrode and the negative electrode of the battery are in a state of charge and discharge when they are in contact. The contact point is not the piece of copper we see on the outside of the battery, but a connection inside the battery. The electrode ears are divided into three materials. The positive electrode of the battery uses aluminum (Al) material. If the battery is a lithium titanate anode, it is usually used as the negative ear. The negative electrode uses nickel (Ni) material, which is mainly used for digital small batteries, such as: mobile phone batteries, mobile power batteries, tablet batteries, smart transmission equipment batteries, etc.
The negative electrode also has copper-nickel (Ni-Cu) materials, which are composed of two parts, a film and a metal strip, and are mainly used for power batteries and high-rate batteries.
The film is the insulating part of the tab. Its function is to prevent the short circuit between the metal tape and the aluminum-plastic film during the battery packaging process, and heat (about 140°C) and the aluminum-plastic film heat-melt seal to prevent leakage. The lug is composed of two films, and a metal band is sandwiched between the two films. There are three types of films used in the market: black glue, white glue and single-layer glue. The common black film has a three-layer structure: melanin, with a melting point of 66°C; melanin. PE, melting point 105°C; PP, melting point 137°C.
The finished packaging of the tab can be divided into disc type (the whole metal strip of the film is wound into a disc through the equipment) and flat type (the metal strip is cut into a single strip after adding the film), and then placed continuously, using two thin transparent The plastic sheet is sandwiched in the middle).