SHINHOP laser

Currently, the country is vigorously promoting and encouraging the development of the new energy industry, among which the manufacturing of power batteries is a relatively important project. Therefore, in the current production of 18650 battery cells, the ear welding and cap welding are all done using laser welding machines. Due to the variety of cylindrical battery types (compared to other soft-pack batteries, the models of cylindrical batteries are relatively standardized), the 32650/23650/22650 cylindrical battery caps and ears also use laser welding machines for welding. So, why has traditional resistance welding been replaced by laser welding? We must discuss some relevant knowledge involved in the welding of battery cells!
Not only the 18650 cylindrical batteries but also square aluminum shell batteries and polymer soft-pack batteries require laser welding equipment to complete their welding processing. What are the types and components of processing? 1. The components for welding the 18650 cylindrical battery include the cap, ear, and the spot welding connecting the ear and cap, as well as the series and parallel welding of the power battery module's battery cells (traditionally using resistance welding, now starting to use laser welding, which is already a market demand in the industry). Among them, a single cap has places that need to be welded, such as the spot welding of the explosion-proof piece and hole cover, and edge seam welding. The ear and cap also need to use laser spot welding (generally using laser pulse welding). Currently, Tesla (which previously used 21700 cells) and Jianghuai Automobile use 18650 cylindrical batteries as power batteries.

2. The square aluminum shell power batteries require even more laser welding places, including the sealing welding of the battery cover, explosion-proof piece, explosion-proof valve bracket, pole welding, flip piece welding, and pole aluminum to nickel welding, etc. The power battery modules using square cells also need to use lasers for the welding of series and parallel connecting pieces. Most square aluminum shell batteries currently use laser welding. Due to the thicker shell of square batteries, especially for pole welding and sealing welding, laser welding machines are needed to better complete the welding tasks. The quality of laser in spot welding and continuous welding is difficult to achieve with other welding processes. On the other hand, many materials of battery cell components are dissimilar materials for welding, such as copper to aluminum welding, aluminum to nickel welding, or various alloy materials welding. Therefore, laser welding machines are more suitable for these process requirements. However, without certain welding experience, it is difficult to achieve ideal quality. Traditional welding methods, including ultrasonic and resistance welding, are no longer suitable for the current quality requirements of power battery welding and affect the market competitiveness of battery products.

3. The welding of polymer soft-pack batteries mainly involves aluminum to nickel welding of the ear. The positive electrode of the battery is made of aluminum material, while the negative electrode is nickel or nickel-plated copper. To facilitate the subsequent soldering work for manufacturers, we must connect a piece of nickel to the aluminum pole, so aluminum to nickel welding is a necessary process. Since soft-pack batteries can achieve customized production, the width and thickness of the ears can vary. Using laser welding, adjustments can be made to the current, pulse width, peak pulse, etc., to better facilitate the aluminum to nickel welding of different specifications of ears.

The above are the commonly used battery cells for power batteries. From the perspective of application scale, square aluminum shell batteries have a larger application volume, while cylindrical cells and soft-pack cells are not significantly different. However, due to some major brand cars using cylindrical batteries, it has also driven more users' attention to cylindrical cells to a certain extent. It can be said that the three types of cells each have their own advantages, with some focusing more on safety, durability, and impact resistance, while others emphasize large capacity, portability, and safety!
Regardless of how the power battery cells change, using laser welding machines for welding production is the trend of current and future development, and it is a major quality process technology in market competition. Therefore, there are now many specialized devices for welding battery components on the market, including the ear aluminum to nickel laser welding machine, cap laser welding machine, ear laser welding machine, and cap sealing laser welding equipment, among others. How much do these laser welding machines cost? In fact, it requires specific discussions at the factory, as user needs vary, and the prices of equipment produced at different stages will also change with the market component prices. Some users only need devices that generate lasers, while others require semi-automatic or fully automatic equipment. Moreover, there is no uniformity in structural matching. It can be said that these devices need to be customized, not available as stock or inventory. Even for welding the same battery components, the production speed and process quality also need user confirmation before quoting, as it involves quality requirements for lasers and other aspects. If you really want to get a price, it can only be a price range. It is better to come directly to SHINHOP laser equipment manufacturer for discussions to determine your plan, which will facilitate our quoting. Here, I emphasize again that purchasing laser equipment is a large transaction, and it is more reliable to come to the factory for an on-site inspection! Welcome to visit SHINHOP ear cap laser welding machine.
[This article is original by "SHINHOP Laser Equipment" and is for reference and learning only. Reproduction/copying is not allowed to avoid unnecessary legal liability issues.]