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Soft pack lithium-ion battery pole ear

Amazing! Understanding the pole ears of soft pack lithium-ion batteries

1. What is a battery earphone?

Sukhavati is an integral part of soft package lithium ion battery products. Batteries are divided into positive and negative electrodes. The electrode ear is a metal conductor that leads the positive and negative electrodes out of the battery. It is often said that the positive and negative electrodes of the battery are the contact points during charging and discharging. The positive electrode of the battery uses aluminum (Al) data, the negative electrode uses nickel (Ni) data, and the negative electrode also has copper nickel (Ni Cu) data. They are compounds composed of two parts: a thin film and a metal strip.

2. Classification of polar ears

2.1 According to the material of the pole ear metal strip:

Aluminum (Al) electrode lug: generally used as positive electrode lug. If the battery is Lithium titanate negative electrode, it can also be used as negative electrode lug.

Nickel (Ni) electrode ear: As a negative electrode ear, it is important for digital small batteries, such as mobile phone batteries, mobile power supply batteries, tablet computer batteries, intelligent transmission device batteries, etc.

Copper plated nickel (Ni Cu) electrode ear: used as a negative electrode ear and important for power lithium-ion batteries and high-power batteries.

2.2 According to the magnetic pole ear glue (domestic market):

Vinyl ear: Generally used for low-end digital small batteries.

Yellow rubber rod ear: generally used for low-end power lithium-ion batteries and high-power batteries.

White plastic ear pole: generally used for high-end digital batteries, power lithium-ion batteries, and high-power batteries.

2.3 The packaging of polar ear products is divided into:

(1) Disk type magnetic pole ear (equipment after the entire metal strip and coil after the entire film form a disk), used for automated processing lines

This plate type ear (metal strip with thin film cut into single pieces, then placed in a row with two thin transparent plastic film clips in the middle) is used for ordinary processing lines.

3. Raw materials for battery ear metal strips

AL1050 aluminum alloy is formed by adding a small amount of copper to pure aluminum, which has good formability and production performance, high corrosion resistance, good weldability, and good conductivity.

TU1 is an oxygen free copper with extremely low oxygen impurity content, high purity, good conductivity and thermal conductivity, good ductility, low permeability, and very little or no hydrogen disease; Good production performance, good welding, corrosion resistance, and cold resistance.

4. Structure and performance of various brands of polar ear adhesives

4.1. Various brands of polar ear adhesive structures

The current Gole adhesive is imported from Japan, and the processing technology of Gole adhesive is relatively difficult: the molecular weight of PP data is controlled within a relatively narrow range, and the current domestic processing technology of PP adhesive can no longer meet the requirements.

Pole ear adhesive structure: Pole ear adhesive is generally composed of three layers of hot pressed together, except for relief board and single-layer modified PP made by Zhao'an and five layers made by Tengsen. Generally speaking, polar ear adhesive consists of a central frame layer and two external modified polypropylene layers. These two externally modified PP materials are the same. In order to seek the adhesion strength between the ultra-high adhesive layer and the metal belt, Hitachi and Tengsen have two modified PP materials with different appearances, one is the property modification page of Good Gold, and the other is the pro plastic appearance modification page. This type of polar ear adhesive, once used for manufacturing polar ears, will definitely lead to gas expansion and liquid leakage accidents.

At present, in the domestic market, the polar ear glue used for manufacturing polar ears can be divided into white glue, black glue, yellow glue, and single-layer glue. Among them, high-end battery customers mostly choose single-layer embossed 80m and 50m white glue. Low to mid end customers generally choose DNP vinyl and DNP yellow glue. There are many options for three-layer white glue in Japan and South Korea. Single layer white glue is rarely used by battery companies in Japan and South Korea, with a basic three-layer structure of white glue used. Domestic high-end battery companies are also gradually choosing three-layer structure of white glue.

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