Lithium Battery Core Pack Laser Welding

Product Description:

It is used for core pack welding of FTW double-headed ears, and is equipped with functions such as core pack clamping and positioning, upper busbar, core pack caching, ears bending/rolling, laser welding, weld seam appearance inspection and weld seam internal resistance inspection.

• Core pack clamping and positioning, upper busbar, core pack cache, ears bending and rolling, laser welding, weld seam internal resistance detection function, weld seam width detection core pack

• Automatic code scanning, pallet RFID automatic code reading, and data and work information binding with Core pack auto-entry function

• With all kinds of NG material discharge function as well as the core module anti-drop function, the safety protection function of the breast machine

• Core pack automatic discharge of fire/smoke from the welding station to the water tank function

• Communication with the customer's MES system is available to automatically complete product data upload and traceability

Lithium Battery Laser Welding Advantages

The advantages of power lithium-sulfur battery laser welding are that the welding material loss is small, the deformation of the welded workpiece is small, the equipment performance is stable and easy to operate, and the welding quality and automation are high. Its technological advantages are incomparable with other welding methods as follows:

The energy is concentrated, the welding efficiency is high, the machining accuracy is high, and the welding seam aspect ratio is large. The laser beam is easy to focus, align, and guided by optical instruments. It can be placed at an appropriate distance from the workpiece, and can be redirected between fixtures or obstacles around the workpiece. Other welding laws cannot be used due to the above-mentioned space constraints.

Small heat input, small heat affected zone, small residual stress and deformation of workpiece; precise control of welding energy, stable welding effect and good welding appearance;

Lithium battery laser welding can be precisely controlled, with small focusing spot and high-precision positioning. It is easy to realize automation with robotic arms, improve welding efficiency and reduce costs;

Non-contact welding, optical fiber transmission, good accessibility and high degree of automation. When welding thin or thin wire rods, there is no problem of melting back like arc welding.

High-efficiency and precise power lithium battery laser welding machine can greatly improve the safety and service life of automotive power batteries, and will bring revolutionary progress to future automotive power technology; power lithium batteries have many laser welding parts, with withstand voltage and night leakage tests. Requirements, most of the materials are aluminum, because the welding is difficult, and the requirements for the welding process are higher.

As the core component of new energy vehicles, the quality of power lithium battery welding basically determines the safety and quality of the entire new energy vehicle. It is these laser advantages that make laser welding machines successfully applied in power battery welding processing. And with the further improvement of new energy vehicle technology, it will promote the further optimization and upgrading of power lithium battery welding machine technology to a certain extent.

Explain The Application Of Laser Welding In The New Energy Battery Industry

Today's automobile industry is developing rapidly, and with the intensification of the energy crisis, the world's major automobile manufacturers are stepping up the development of new energy vehicles. Regardless of the country or major automobile manufacturers, government departments have also issued a series of support policies. The energy battery industry is a development trend in the future. Many laser welding machine manufacturers seize this development opportunity to make a series of welding solutions for power battery welding.

HGLASER is a professional manufacturer of R&D and manufacturing laser welding machines. It has rich experience in the production of precision welding equipment. Here, we will explain the welding process of laser welding in the new energy battery industry in detail.

1. Automatic welding of cylindrical battery caps

The equipment is mainly used for the welding of cylindrical battery caps, which can realize the welding of 18650 and 18460 battery caps. The equipment adopts manual loading and unloading, and automatically realizes pressing, welding and unloading. It can greatly increase the welding efficiency and realize the versatility of cylindrical battery welding of various specifications.

2. Battery pole piece welding

The equipment mainly uses the welding between the power battery pole piece and the nickel piece. It adopts semi-automatic feeding. One manual feeding can meet the needs of 3 hours. The equipment runs automatically, automatically grabs the pole piece and the nickel piece, and combines the two in At the same time, it can realize automatic compression welding, automatic loading and unloading after welding, the finished products of the unloading mechanism are piled up to a certain number of equipment with sound and light alarm, and then the finished products are manually transferred to other places at one time.

3. Power battery injection hole

The manipulator grabs the power batteries one by one and puts them into the accompanying fixture, and then clamps them. After clamping, the laser ranging and focusing is adjusted, and then cleaned. Automatic unloading.

The efficiency of laser welding is high, and it is easy to realize automatic production. The process of laser welding is constantly improving, and there are more and more applications in actual production. Laser welding and robots are gradually becoming the main force in the production of automated power battery modules. The laser welding machines produced by HGLASER have been applied in hundreds of power vehicle industries around the world.

Laser Welding Principle Of Square Aluminum Shell Battery Laser Welding

In the process of manufacturing and assembling square aluminum-shell lithium batteries, a large number of laser welding processes are required.

For example: the soft connection of the cell and the cover plate welding, the cover plate sealing welding, the sealing nail welding and so on. Laser welding is the main welding method for square power batteries. It is due to laser welding that it has many advantages such as high energy density, good power stability, high welding accuracy, and easy system integration. In the production process of square aluminum shell lithium batteries, there are irreplaceable effect.

Principle knowledge of laser welding technology

The laser welding machine uses high-energy laser pulses to locally heat the material in a small area. The energy of the laser radiation diffuses into the interior of the material through heat conduction, and the material is melted to form a specific molten pool.

It is a new type of welding method, mainly for the welding of thin-walled materials and fine parts, which can realize spot welding, butt welding, stitch welding, sealing welding, etc., with high aspect ratio, small weld width, small heat affected zone, Small deformation, fast welding speed, smooth and beautiful welding seam, no need or simple treatment after welding, high welding seam quality, no pores, accurate control, small focusing spot, high positioning accuracy, easy to realize automation.

Laser welding can be realized by pulsed or continuous laser beam; the principle of laser welding can be divided into heat conduction welding and laser deep penetration welding.

Thermal welding:

Laser radiation heats the surface to be processed, and the surface heat diffuses to the interior through thermal conduction. By controlling the laser parameters such as the width, energy, peak power and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool.

Deep penetration welding:

Generally, continuous laser beams are used to complete the connection of materials, that is, the energy conversion mechanism is completed through a "key-hole" structure. When the laser is irradiated, the material evaporates and forms a small hole, which absorbs all the energy of the incident beam, and the temperature reaches about 25000 ℃, so that the metal surrounding the hole is melted.

The development prospect of laser welding of square aluminum shell:

The occupancy rate of lithium battery aluminum shell is higher than that of steel shell, which is determined by the advantages of high hardness, light weight, and high safety of aluminum shell. The square lithium battery can be customized according to the product size, so there are many models and specifications on the market, which makes it difficult to unify the process of the square battery. Standardization of prismatic batteries is a trend, which is of great significance for component production and post-maintenance.

The welding of the cover plate of the square battery shell is mainly divided into top welding and side welding. There is a rectangular cover plate on the top, with a positive terminal on the plate, insert the cover plate into the casing and flush with the upper opening, and then use a laser to weld the rectangular gap between the cover plate and the casing by repeating continuous laser welding. , This welding process is called top welding. During top welding, the laser beam can not move, and the battery can be fixed on the worktable. After the laser beam is aligned with the welding seam, the worktable is started to make the battery go out in turn along the X and Y coordinates of the worktable. The same rectangular shape of the weld. When the cover plate of the square battery adopts the top welding sealing structure process, the cover plate is placed without positioning steps, and the length and dimension tolerance requirements are stricter, and the welding assembly accuracy is required.

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