What is a polymer lithium-ion battery ear?

Tabs are a raw material for lithium-ion polymer battery products. For example, mobile phone batteries, Bluetooth batteries, and laptop batteries that we use in our lives all need to use tabs.

The battery is divided into positive and negative poles, and the tabs are metal conductors that lead the positive and negative poles from the battery core. In layman's terms, the ears of the positive and negative poles of the battery are the contact points during charging and discharging. This contact point is not the copper sheet on the outside of the battery we see, but a connection inside the battery. The battery lugs are divided into three 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 copper (Ni-Cu) material. They are all composed of two parts: film and metal strip. Become.

The film is the insulating part on the tab. Its function is to prevent the short circuit between the metal tape and the aluminum plastic film when the battery is packaged, and it is heated (about 140 ℃) and the aluminum plastic film is heat-melt sealed to prevent it from being bonded together during packaging. Leaking. A lug is sandwiched between a metal band by two pieces of film. There are three types of films used in the market: black glue, white glue and single-layer glue. The commonly used black film has a three-layer structure: melanin, with a melting point of 66°C; PE, with a melting point of 105°C; PP, with a melting point of 137°C.

The finished packaging of the tabs is divided into reel type (the whole metal belt passes through the equipment and the film is wound into a reel) and plate type (the metal belt is added with the film and then cut into a single piece, and then placed in a row for two A thin transparent plastic sheet is sandwiched in the middle).