Hydrogen fuel vehicle is mainly composed of fuel cell system (including fuel cell reactor, air compressor, etc.), auxiliary power cell, hydrogen storage device, driving motor and power control device. Among them, fuel cell is the main power source of hydrogen fuel vehicle and the key component affecting the performance of fuel vehicle.
Fuel cell is an efficient power generation device. It does not burn fuel, but directly converts the chemical energy of fuel into electrical energy through electrochemical reaction. It is mainly composed of end plate, insulating plate, collector plate and single cell (including bipolar plate and MEA). The pressing force exerted by the combination of screw and end plate between components is combined into a short electric pile, which plays the role of supporting, collecting current, providing channel for coolant, separating oxidant and reductant, etc.
Classification of bipolar plates for hydrogen fuel cells
There are three kinds of common anode plates of hydrogen energy fuel cell: graphite bipolar plate, metal bipolar plate and composite bipolar plate, which have different advantages.
Graphite bipolar plate
It mainly adopts the manufacturing method of graphite plate machining. It has good chemical stability, high conductivity and good thermal conductivity in the electrochemical environment. It is the most widely used in the research and application of proton exchange membrane fuel cell at present.
Metal bipolar plate
用不锈钢、钛、铝合金等冲压成形，具有电导率高、价格低廉、工艺制法多种多样、机械强度高等优点。在性能和成本方面，金属双极板更适合批量生产。
Composite bipolar plate
Stamping with stainless steel, titanium and aluminum alloy has the advantages of high conductivity, low price, various process methods and high mechanical strength. In terms of performance and cost, metal bipolar plates are more suitable for mass production.
Welding method for bipolar plate of fuel cell of hydrogen energy vehicle
Bipolar plate welding, shunt area welding and sealing area welding, most of the materials are metal and composite plate, and the welding of single material is between 0.05mm ~ 0.3mm thick. Laser welding bipolar plate can be based on laser output
According to the laser output mode, laser welding bipolar plate can be generally divided into pulse welding and continuous welding.
Laser welding bipolar plate can be generally divided into QCW welding, MOPA welding and single-mode welding according to laser classification.
Laser welding bipolar plate can be divided into exit welding and galvanometer welding, depending on the type of welding joint.
Examples of hydrogen fuel cell welding
Many factors such as sealing, stability, consistency, durability and flatness shall be considered in bipolar plate welding, and the welding requirements are very strict. Guoyu technology has always adhered to technological innovation in the field of laser welding, has a number of independent intellectual property rights and mastered the core technology in the field of laser welding, effectively guaranteed the excellent welding process of hydrogen energy fuel cell, and successfully developed a large number of successful cases of excellent hydrogen energy fuel cell welding.
Stack strap laser welding machine
The equipment is composed of tooling fixture, feeding mechanism, pressing mechanism, servo pressurizing mechanism, PLC control system, laser, welding workbench, chiller, smoke purifier, etc.
Equipment process:
Bipolar wafer clamping → transporting to welding position → pressurizing bipolar wafer → welding bipolar wafer → transporting to blanking position → bipolar wafer blanking
Equipment advantages and features:
- Large format XYZ 3D platform, and the format size can be customized;
- High beam quality fiber laser;
- Customized development of laser and motion control software;
- Coaxial gas protection device to ensure the consistency of welding quality;
- Special fixture to ensure welding consistency and control product deformation.
- Independent modular design, which can be used with flexible and automatic production line.
- The equipment has the advantages of small floor area, environmental protection, less consumables, low maintenance cost and simple program operation.
Sample picture:
Stack automatic binding welder
The equipment is composed of servo pressurization mechanism, PLC control system, laser welding machine, belt conveyor, reactor conveyor, cold water heater, smoke purifier, etc.
Equipment process:
Strap feeding → stack feeding → start button → fixture fixing → pressing stack → steel belt bending → welding steel belt → loosening fixture → stack feeding
Equipment advantages and features:
Intelligent equipment such as elastic belt conveying unit, electric pile conveying vehicle and electric pile fixture developed by Guoyu technology are adopted to improve the automation and stability of the equipment.
Independent modular design, flexible and can be used with automatic production line.
An industrial monitoring system which can monitor the welding process in real time is configured.
Simple operation and convenient maintenance.
Product diagram:
Bipolar plate double bit welder
The equipment consists of servo pressurizing mechanism, PLC control system, laser, welding workbench, chiller, smoke purifier, etc.
Equipment process:
Plate loading → fixture fixing → start button → visual positioning → welding plate → loosening fixture → plate blanking
Equipment advantages and features:
Double station welding, high productivity and small floor area.
Independent modular design, flexible and can be used with automatic production line.
An industrial monitoring system which can monitor the welding process in real time is configured.
In order to ensure the welding consistency, a high reliability fixture is designed;
Product diagram:
Stack assembly line
The equipment is mainly composed of electric reactor press, laser welding machine, electric reactor transport vehicle, chiller, smoke purifier, electric reactor tightness detector, turnover blanking machine, AJV flow transfer vehicle, etc.
Equipment process:
Bipolar plate loading → code scanning → stacking and pressing → automatic binding of stack steel strip → automatic welding of stack steel strip → air tightness inspection of stack → output of stack
Equipment advantages and features:
Automatic loading and unloading;
High efficiency, less consumables, low maintenance cost and simple operation procedure.
An industrial monitoring system which can monitor the welding process in real time is configured.
Automatic post welding inspection
Information parameter tracing function
Special fixture to ensure high quality of welding effect.
In recent years, with the support of national industrial policies, the fuel cell industry has been developing continuously. Guoyu technology has arranged in advance in the fuel cell bipolar plate welding industry of hydrogen energy vehicles and cooperated with many well-known new energy enterprises in the industry. In the future, Guoyu technology will rely on many years of R & D and service experience of laser welding automation equipment in the new energy industry, Output more and higher quality laser equipment for the new energy industry and help enterprises take off.