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Detailed introduction to manual battery spot welding machine

April 22, 2024

#Battery spot welding machine # Lithium battery spot welding machine belongs to resistance welding machine. Resistance welding is suitable for welding between metals, and it basically consists of a welding head that clamps the metal and applies pressure, and a welding machine power supply that outputs current.
So what is resistance welding? Why can metals be welded together. Resistance is the resistance in the opposite direction of travel, similar to the heating phenomenon caused by friction when braking. When current flows between two metals, the resistance of the metal itself and the resistance of the contact area will generate heat. Resistance welding is the welding of metals together using pressure and heat. Overlap the metal to be welded together and apply pressure. When electrified in this state, the greater the resistance between metals, the easier it is to generate heat, causing them to melt and weld together.
The method of melting metal by utilizing the contact resistance between metals to generate Joule heat is called resistance welding.
Below, we will provide a detailed introduction to the components of lithium battery point welding.

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Welding power supply
Electrify between metals. For providing current to the welded metal, it can be used to adjust the welding current and welding time. Welding current value (adjustable) and welding time (adjustable)
There are four types of welding power sources according to the power supply method;
AC welding power supply: The most widely used power supply, with simple structure, convenient maintenance and repair, and sturdy and durable characteristics. Welding takes a long time, has high versatility, and is often used for easier welding such as iron. The ascent speed is slow. The interval between the first pulse and the second pulse is long, and after the first pulse ends, the second pulse only arrives after a certain period of time, resulting in a relatively low ability utilization rate.
Capacitive energy storage welding power supply:

A welding machine that uses the energy stored in the capacitor to discharge and energize the workpiece. Instantly generate high current, and use contact resistance welding during welding. The current rises quickly and sparks are large, resulting in a short duration of energy. Charging and discharging circuits suffer from significant energy loss. Commonly used in materials such as aluminum and copper that have good heat dissipation and are difficult to weld. Because capacitors can store energy, even small power equipment in factories can be used.
High frequency welding power supply:

A welding method that converts AC frequency into rectification output. Due to its high frequency, good thermal efficiency, and feedback function of current and voltage, it can obtain stable and high-quality welding every time, making it very suitable for precision welding. Because it can perform fast and continuous welding, welding transformers are very suitable for use on automatic machines due to their small and lightweight characteristics.
Transistor welding power supply:

It uses high-power transistors to directly control the welding current, and can provide feedback on current, voltage, and waveform control, just like high-frequency welding power supplies. Thermal efficiency is the best among the four welding methods, which can achieve stable welding quality. Extremely suitable for precision welding of ultra-fine lines and other materials. It has the characteristics of being able to control the power on time in units of 0.01ms, short time high current, and low input power capacity. Adopting closed-loop control, feedback is reflected to the input end through the feedback loop, adjusting the input quantity to achieve the goal of correcting control errors and improving control accuracy.

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Welding head
Clamp pressure, apply pressure, pressurization mechanism. Clamp the overlapping metals together and apply a certain amount of pressure, and the part where the welded metal is clamped is the welding electrode.
Welding electrodes
There are a variety of materials and shapes to choose the electrode that is most suitable for welding. The welding head applies pressure, and the pressure can be adjusted to select the most suitable pressure. Electrode front diameter, current density, and electrode material.
Foot pedal switch
Send a welding signal to the welding power source and start the welding head for spot welding action.
Air connection
Connect the pressure regulating valve, adjust the gas source pressure to filter water, and send gas to the solenoid valve. The solenoid valve controls the gas to drive the cylinder and drive the welding head to weld.

 

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