SHINHOP laser

Although hydrogen fuel vehicles are developing rapidly in Japan, they are also a major technological development direction for new energy vehicles in our country. Due to the many technical advantages of hydrogen fuel cells, such as: no pollution, low noise, strong endurance, etc., they have become a new direction for the development of our new energy vehicles. However, hydrogen fuel new energy vehicles also require the assistance of power batteries. Their system consists of a fuel cell control system, auxiliary power battery, hydrogen storage device, drive motor, and motor control unit, with the fuel cell being the main power source, similar to the engine of a gasoline car, where the quality fundamentally determines the performance of a car.
Fuel cells are efficient power generation devices that convert the chemical energy of fuel directly into electrical energy through electrochemical reactions without burning fuel. They mainly consist of end plates, insulating plates, current collectors, and single cells (including bipolar plates and MEA). The components are compressed into a short stack by screws and the pressure applied by the end plates, serving functions such as support, current collection, providing channels for coolant, and separating oxidants and reductants.
I. Classification of Hydrogen Energy Fuel Cell Bipolar Plates
Common hydrogen energy fuel cell bipolar plates include three types: graphite bipolar plates, metal bipolar plates, and composite bipolar plates, each with different advantages.
1. Graphite Bipolar Plates
Mainly prepared by machining graphite plates, they have good chemical stability in electrochemical environments, as well as high electrical conductivity and good thermal conductivity. They are currently the most widely used in proton exchange membrane fuel cell research and applications.

2. Metal Bipolar Plates
Formed by stamping stainless steel, titanium alloys, aluminum alloys, etc., they have advantages such as high electrical conductivity, low cost, diverse manufacturing processes, and high mechanical strength. In terms of performance and cost, metal bipolar plates are more suitable for large-scale mass production.

3. Composite Bipolar Plates
Composite bipolar plates can be divided into multilayer composite types and composite material types, with advantages such as good electrical and mechanical properties, strong corrosion resistance, and lightweight.

II. Welding Methods for Hydrogen Energy Vehicle Fuel Cell Bipolar Plates:
Bipolar plate welding includes flow channel area welding and sealing area welding, with the corresponding materials mostly being metal and composite plates. The thickness distribution of single materials for welding is between 0.05mm and 0.3mm. Laser welding of bipolar plates can be classified into various types based on laser output, laser types, welding heads, etc.
1. Laser welding of bipolar plates can generally be divided into two types: pulsed welding and continuous welding based on the laser output method.
2. Laser welding of bipolar plates can generally be classified into QCW welding, Mopa welding, and single-mode welding based on the type of laser.
3. Laser welding of bipolar plates can generally be classified into output head welding and galvanometer welding based on the type of welding head.
III. Welding Cases for Hydrogen Energy Fuel Cells
Bipolar plate welding needs to consider various factors such as sealing, firmness, consistency, durability, and flatness, with extremely strict requirements for welding. There are already several suppliers in the country providing welding solutions for hydrogen energy fuel cells. Let's take a look at the configuration of the stack band welding machine.
[Stack Band Welding Machine]
1. This equipment consists of a servo pressurizing mechanism, PLC control system, laser, welding workbench, chiller, smoke purifier, etc.
2. Equipment process flow: band feeding → stack feeding → stack positioning → start button → press stack → bend steel band → weld steel band → stack unloading

3. Equipment advantages and features:
A. Manual loading and unloading, workpiece moving positioning with automatic band forming;
B. Automatic focusing, precise positioning, fast welding speed, good consistency, beautiful weld seams, stable performance;
C. Full-process pressure monitoring;
D. Standalone modular design, flexible and highly adaptable, can also be used with automated production lines.
E. The equipment occupies a small area, consumes few materials, has low maintenance costs, and simple program operation.
[Automatic Stack Band Welding Machine]
1. This equipment consists of a servo pressurizing mechanism, PLC control system, laser welding machine, band conveying mechanism, stack transport vehicle, chiller, smoke purifier, etc.
2. Equipment process flow: band feeding → stack feeding → start button → fixture fixing → press stack → bend steel band → weld steel band → release fixture → stack unloading

3. Equipment advantages and features
A. The use of UW independently developed band conveying mechanism, stack transport vehicle, stack tooling fixtures, and other intelligent mechanisms improves the automation and stability of the equipment; B. Standalone modular design, flexible and highly adaptable, can also be used with automated production lines;
C. Equipped with an industrial monitoring system for real-time monitoring of the welding process;
D. Simple operation and convenient maintenance.
[Bipolar Plate Dual-Station Welding Machine]
1. This equipment consists of a servo pressurizing mechanism, PLC control system, laser, welding workbench, chiller, smoke purifier, etc.
2. Equipment process flow: plate feeding → fixture fixing → start button → visual positioning → weld plate → release fixture → plate unloading

3. Equipment advantages and features:
A. Dual-station welding is adopted, with high production efficiency and small footprint;
B. Standalone modular design, flexible and highly adaptable, can also be used with automated production lines;
C. Equipped with an industrial monitoring system for real-time monitoring of the welding process;
D. High reliability tooling clamping design ensures welding consistency;
[Stack Assembly Production Line]
1. The device mainly consists of a stack press machine, laser welding machine, stack conveyor, chiller, smoke purifier, stack airtightness testing machine, flipping feeder, AJV transfer vehicle, etc.
2. Equipment process flow: Bipolar plate feeding → Scanning → Stacking and pressing → Automatic binding of stack steel belt → Automatic welding of stack steel belt → Stack airtightness inspection → Stack output
3. Equipment advantages and features:
A. Fully automatic loading and unloading;
B. High efficiency, low consumables, low maintenance cost, simple program operation;
C. Equipped with an industrial monitoring system for real-time monitoring of the welding process;
D. Automatic post-welding inspection;
E. Information parameter traceability function;
D. Special fixtures to ensure high-quality welding.

If you encounter some technical problems in welding hydrogen fuel cell bipolar plates, you can contact SHINHOP Laser, which will provide you with suitable laser welding solutions and related laser welding equipment systems for hydrogen fuel cell bipolar plates.
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