Tab material of flexible-packaging lithium battery as well as electroplating method and application method thereof

Abstract

The invention discloses a tab material of a flexible-packaging lithium battery as well as an electroplating method and an application method thereof, wherein the tab material and the application method thereof are suitable for preparing an anode tab and a cathode tab of the flexible-packaging lithium battery and welding a circuit board. For the tab material, an SUS430 stainless steel band, a copper band, an aluminum band, a nickel band and other conduction materials as the substrate, a nickel-plated layer is firstly plated at one side end of the substrate, and then a tin-plated layer is plated on the nickel-plate layer (the tin-plated layer is directly plated on the nickel band), so as to obtain the tab material with lower production cost, good weldability and appropriate thermal conductivity. For the application method, at the position of the tab material double layers of nickel and tin, laser heating is carried out on one side of the position without being plated, and the tab material is heated to the tin melting point instantly, so that the tab material is welded on a metal material to be welded. With the adoption of the invention, the anode tab and the cathode tab are simultaneously welded, and less heat can be generated in the welding process, thereby ensuring the weldability with high strength and protecting the battery.

Description

technical field [0001] The invention discloses a soft-packed lithium battery tab material and its electroplating and application method. The tab material and its application method of the invention are suitable for the preparation and welding of the positive and negative tabs of a soft-packed lithium battery, especially for a The invention relates to the preparation and welding of positive and negative tabs of an ultra-thin soft-pack lithium battery, which is used in active RFID, active IC cards, music cards, greeting cards and other products. Background technique [0002] With the development of science and technology, active RFID and active IC cards have been more and more widely studied. An ultra-thin soft-pack lithium battery has the advantages of light weight, large specific energy, good insulation, and low cost. Become the most suitable power supply for active RFID and active IC cards. [0003] At present, the tabs of soft-packed lithium batteries include positive tab...

AI Technical Summary

Problems solved by technology

[0003] At present, the tabs of soft-packed lithium batteries include positive tabs made of metal aluminum and negative tabs made of metal nickel and copper. There are many problems in the technology. Using the current technology in ultra-thin soft-packed lithium batteries will bring Further problems: 1. Due to the unweldability of aluminum, the positive tab made of metal aluminum needs to be converted to nickel. However, the operation of converting nickel is troublesome, and the labor cost increases, and the tab after nickel conversion is easy to desolder and break.

2. Nickel strips are used as negative tabs in ordinary soft-pack lithium batteries, but the price of nickel is expensive, which is not conducive to reducing production costs

3. Ultrasonic welding or laser welding is usually used for the welding of the tabs. However, the heat generated by these welding methods will have a great impact on the leak-proof performance of the soft-packed lithium battery, especially for this ultra-thin soft-packed lithium battery. , firstly, the heat generated by welding will destroy the aluminum-plastic film, resulting in a short circuit of the battery; secondly, the heat generated by welding will be transmitted into the battery through the tabs, causing the battery to leak, bulge, and even melt the lithium metal, seriously damaging the soft package. Lithium battery life and battery performance

However, copper also has a relatively high cost, which is not conducive to reducing costs. At the same time, it cannot meet the welding requirements of ultra-thin soft-pack lithium batteries and materials to be welded.

[0007] Moreover, there is still a problem with the above-mentioned improved tabs made of aluminum and copper: due to their good thermal conductivity, the heat generated during the welding process will be rapidly conducted on the tabs, and excessive heat will damage the tabs. The insulating layer of the aluminum-plastic film and the tab glue, heating for too long will also melt the lithium metal of the negative electrode of the battery, which will damage the service life and battery performance

[0008] At present, the main research direction of the tab material is concentrated on the material selection and welding method of the tab, and there is little research on the influence of the heat generated during welding on the battery.

Images