Battery spot welder: A key tool for building high-quality batteries

In the rapidly developing new energy industry, lithium batteries as the core energy storage components, its performance and production efficiency are directly related to the performance and market performance of electric vehicles, energy storage systems and all kinds of portable electronic devices. In the production process of lithium batteries, the Welding process is particularly critical, and the Battery Spot Welding Machine is an indispensable important equipment.

1、lithium battery spot welding machine overview

1.1 Definitions

Lithium battery spot welding machine, as the name suggests, is a kind of equipment specially used for spot welding between the battery cell and the pole, pole ear and other components in the manufacturing process of lithium battery. Through the instantaneous discharge of high energy, the metal on the contact surface quickly melts and solidifies, forming a solid metallurgical bond, so as to achieve the purpose of electrical connection and mechanical fixation.

1.2 Working Principle

The working principle of the lithium battery spot weldermachine is based on the basic principle of resistance welding, which uses the resistance heat generated by the current through the contact surface of the metal to be welded to melt the metal. Specifically, when the electrode applies pressure to the workpiece and is energized, the tiny bulge on the contact surface is first heated and melted, and with the continuous action of the current, the melting area gradually expands, and eventually the nucleus is formed. After power failure, the molten core solidifies during cooling to form a solid welded joint.

1.3 Device Composition

Lithium battery spot welding machine is mainly composed of welding power supply, control system, electrode device, workbench, pressure system and other parts. Welding power supply is responsible for providing electric energy required for welding; The control system is responsible for adjusting welding parameters, such as welding current, welding time, etc. The electrode device is the key component in the welding process, and its material, shape and wear degree directly affect the welding quality. The table is used to place the workpiece to be welded, easy to operate; The pressure system ensures that the electrode applies the appropriate pressure to the workpiece during welding.

2、the role and significance of spot welding machine

2.1 Improve welding quality

In the manufacture of lithium battery, the welding quality is directly related to the safety, reliability and cycle life of the battery. Traditional welding methods, such as manual welding, are easily affected by human factors and the welding quality is unstable. By precisely controlling welding parameters, such as current, time, pressure, etc., the lithium battery spot welding machine can achieve a high degree of automation and consistency of the welding process, and significantly improve the welding quality.

2.2 Improve production efficiency

Lithium battery spot welding machine adopts automatic operation mode, which can greatly reduce manual intervention and improve welding efficiency. At the same time, its fast welding speed and efficient energy conversion rate make the number of welding per unit time significantly increase, effectively shorten the production cycle, reduce the production cost.

3、lithium battery spot welding machine operation process

3.1 Preparations

Equipment inspection: Before using the lithium battery spot welding machine, the equipment should be comprehensively inspected, including the integrity, cleanliness and connection of the welding power supply, control system, electrode device, workbench and pressure system.

Parameter setting: According to the material, thickness and welding requirements of the workpiece to be welded, reasonably set welding parameters, such as welding current, welding time, electrode pressure, etc.

Preparation of the workpiece: the workpiece to be welded (such as the core, pole, pole, etc.) is pre-treated, such as cleaning, removing the oxide layer, etc., to ensure the cleanliness and smoothness of the welding surface.

3.2 Device Debugging

No-load test: Before the formal welding, carry out no-load test to check whether the output voltage and current of the welding power supply are stable and whether the control system works normally.

Electrode calibration: Adjust the electrode position to ensure the neutrality and parallelism between the electrode and the workpiece contact surface to avoid deviation or dislocation during welding.

Pressure test: check whether the working pressure of the pressure system is stable, and whether the pressure of the electrode on the workpiece meets the requirements.

3.3 Formal Welding

Place the workpiece: place the pre-processed workpiece on the workbench according to the design requirements to ensure that the relative position and spacing between the workpiece meet the welding requirements.

Start welding: Press the start button, the welding power supply begins to work, and the electrode applies pressure and current to the workpiece for welding. During the welding process, the welding situation should be closely observed and the welding parameters should be adjusted in time to ensure the welding quality.

Welding completion: After welding, turn off the welding power and wait for the workpiece to cool down. Check the appearance quality of welded joints, such as whether the weld is smooth, no cracks, no slag inclusion, etc.

4、Application cases of lithium battery spot welding machine in lithium battery manufacturing

4.1 Cylindrical battery manufacturing

In the process of cylindrical battery manufacturing, lithium battery spot welding machine is widely used in the welding of cell and pole and pole ear. By precisely controlling the welding parameters and electrode shape, the solid connection between the cell and the pole and the pole ear can be achieved to ensure the stability of the internal structure and electrical performance of the battery.

4.2 Soft-pack battery manufacturing

Soft pack batteries are widely used in portable electronic devices because of their thin and flexible characteristics. In the manufacturing process of soft pack batteries, lithium battery spot welding machine also plays an important role. By using the specially designed electrode and welding process, it can realize the precise welding of the electrode ears of the soft pack battery, and improve the reliability and safety of the battery.

5、the development trend and challenge of lithium battery spot welding machine

5.1 Development Trend

Intelligent: With the rise of industry 4.0 and intelligent manufacturing, lithium battery spot welding machines will develop in a more intelligent direction. Through the integration of sensors, Internet of things and other technologies, real-time monitoring and data analysis of the welding process can be achieved to improve welding accuracy and efficiency.

High precision: With the continuous progress of lithium battery technology, the requirements for welding accuracy are getting higher and higher. In the future, the lithium battery spot welding machine will adopt more advanced control algorithms and precise mechanical structures to achieve higher precision welding.

Multi-functional: In order to meet the welding needs of different fields and different models of lithium batteries, lithium battery spot welding machines will develop in the direction of multi-functional. Through the modular design, different welding modes and parameters can be easily switched.

5.2 Challenges

Technical barriers: lithium battery spot welding machine involves multidisciplinary fields, such as electronic technology, material science, mechanical design, etc., and the technical threshold is high. How to break through the technical barriers and realize the technological innovation and upgrade of equipment is one of the main challenges facing us at present.

Market competition: With the rapid development of the new energy industry, the market competition of lithium battery spot welding machine is becoming increasingly fierce. How to reduce production costs and improve market competitiveness under the premise of ensuring product quality is a problem that manufacturers need to pay attention to.