Which kind of lithium battery spot welding machine is better?
The spot welder, also known as resistance welder, is usually divided into four categories according to the nature of the welding power source:
- AC spot welder
- Energy storage spot welder
- Inverter DC spot welder
- Transistor spot welder
There are four kinds of spot welder, so which is the best spot welder for lithium battery used to weld the battery casing and nickel sheet? Of course, the Transistor Spot Welder is preferred. Why? And see the four spot welder analysis as follows.
A. AC spot welder
AC spot welder is a machine that can firmly weld the workpiece together. The AC spot welder is composed of a step-down transformer, a current regulator and a heat sink, as well as welding wires, handles and other accessories. Instead of using a welding rod, the two workpieces to be welded are simply used as two electrodes in the circuit, and the high temperature generated at the contact resistance is used to melt the metal instantly, thus firmly welding the workpieces together.
The AC welding machine is essentially a special step-down transformer. Changing 220V and 380V AC power to low voltage AC power, the AC welding machine is both an output power type for AC power supply. Welding transformer has its own characteristics, the external characteristics is the characteristics of a sharp drop in voltage after the ignition of the welding rod.
High power AC spot welder generally refers to the power in the 16KVA or more spot welder to vertical pneumatic-based, high power AC spot welder performance characteristics: direct type pressurization mechanism, good follow-through performance, fast welding speed, long service life, low noise safety, easy to use water-saving forced cooling high solid strength body structure upper insulation simple and practical main circuit using high-power SCR non-contact switch high Conductivity, low power loss, in the secondary current circuit in the domestic AC spot welder, the main transformer upper secondary output adopts multi-layer high toughness, high conductivity purple copper soft tape, and U-shaped connection; significantly improve the service life, the lower secondary output adopts an integrated direct connection mechanism, current loss is reduced to a minimum. The main circuit of King Welder AC spot welder adopts water-cooled high-power silicon controlled components, with strong, stable and reliable output power. With the rigidity of shock and vibration resistance, it can prevent the electrode head from sliding when pressurized and realize stable welding. It mainly functions in hardware, electromechanical and automotive industries. The welding precision and welding performance of AC machine is higher than that of energy storage machine.
B. Energy storage spot welding machine
Energy storage capacitors are used to store electrical energy for a longer period of time and release energy at a very high rate in an instant to obtain a larger welding current. Since the charging current is much smaller than the discharging current, the welding efficiency is higher and it is suitable for welding light metals with good electrical and thermal conductivity.
Product performance is a little worse than DC and AC machines, the appearance of welded joints and welding firmness is okay, suitable for the processing of product parts with not very high requirements for appearance. The disadvantage is: energy storage, energy storage, as the name implies, is the first electricity stored in the capacitor of the device, each discharge before the need to charge, the device needs to replace the capacitor after a period of time.
C. Inverter DC spot welder
The principle of DC spot welder is to reverse the AC power into DC power for welding through technology.
The inverter circuit composed of IGBT or field effect tube will change the DC power into AC power of 15-100kHz, and then after being stepped down by the medium frequency main transformer, it will be rectified and filtered again to obtain a smooth DC output welding current (or inverted again to output AC power of the required frequency). The control circuit of the inverter welding equipment is composed of a feeder circuit and a driver circuit, which processes the voltage and current signals to achieve cyclic control of the whole machine, using pulse-width modulation PWM as the core control technology to obtain fast pulse-width modulation of constant current characteristics and excellent welding and cutting process results.
D. Transistor spot welder
The advantages of transistorized battery spot welder are as follows: (1) The current output of transistorized spot welder fluctuates little, the current linearity is high, and various desired current waveforms can be output according to the needs of the process. (2) Compared with the traditional energy storage spot welder, the transistorized spot welder with positive and negative half wave output can solve the problem of asymmetric weld joints. (3) Transistorized spot welder is more energy saving and environmental friendly.
In general, the AC spot welder is cheaper, but the large size of the spot welder takes up a lot of space and is inconvenient to carry, consumes electricity, and is suitable for coarse metal spot welding; the inverter DC spot welder is small, easy to move, saves more than 1/3 of electricity than the AC spot welder of the same specification, and has stable performance, but the price is higher, and is suitable for welding wire and so on; the price of the capacitor discharge spot welder is only a little cheaper than the inverter DC spot welder, and needs to be charged before each discharge, The capacitor needs to be replaced after the equipment has been used for some time. In summary, the transistor spot welder is the most suitable for 18650 power battery welding because of its superior stability and high precision, which is used to weld the battery bottom case and nickel sheet.
Acey New Energy is a professional lithium battery spot welder supplier, providing one-stop solution for lithium ion battery pack assembly line. If you want to know more details, please feel free to contact us.
