Description

Send Inquiry

Composite graphite bipolar plate is a new type of bipolar plate, which is mainly used in fuel cells as an important component. It isolates and distributes oxidant and fuel, conducts current, supports membrane electrode, and regulates the internal temperature of the reactor.

Basic structure and composition

1. Matrix materials:(1) Graphite phase: natural graphite, expanded graphite or artificial graphite provide high electrical conductivity and chemical stability.

Polymer resins: such as phenolic resin, epoxy resin, to enhance mechanical strength and fill the void.

Conductive filler: carbon black, carbon fiber or metal particles to further enhance conductivity.

2. Composite process: through molding, injection molding or hot pressing molding, the graphite is mixed with resin/filler and then cured.

Graphite Bipolar Plate Technical Parameters Table

Category	Parameter	Target Value	Unit
Basic Properties	Density	≥1.90	g/cm³
	Graphite Purity	≥95	wt%
	Porosity	≤0.5	%
Electrical Performance	Volume Conductivity	≥125	S/cm
Electrical Performance	Contact Resistance	≤5	mΩ·cm²
Mechanical Properties	Flexural Strength	≥60	MPa
	Compressive Strength	≥100	MPa
	Shore Hardness	60-80	Shore
Durability	Corrosion Current Density	<1	μA/cm²
	Operating Temperature	-30~180	°C
	Accelerated Lifetime	>30,000	hours
Process Constraints	Minimum Thickness	0.3	mm
	Max. Resin Content	≤15	wt%
	Surface Roughness	Ra≤1.6	μm

This product supports personalized customization.

Function

Composite graphite bipolar plates offer advantages such as low cost, excellent corrosion resistance, and easy formability. Compared to metal bipolar plates, they effectively avoid the common corrosion issues found in fuel cell environments. When compared to graphite bipolar plates, they demonstrate superior gas-tightness and bending strength. Furthermore, these composite materials can be optimized through precise adjustments in resin composition, conductive filler ratios, and the application of graphite modification processes or resin additives, enabling fine-tuned performance enhancements.

Key advantages

Cost benefit: the material cost is 30%-50% lower than pure graphite plate, and it is suitable for injection molding and other batch production processes.
Design flexibility: can be processed into ultra-thin flow channel to optimize the volume power density of fuel cell stack.
Durability: Life>5000 hours under fuel cell conditions, corrosion current density <1 μA/cm².

Application prospect

With the continuous advancement of hydrogen energy technology and the widespread application of proton exchange membrane fuel cells, the market demand for composite graphite bipolar plates-a key component in fuel cell systems-is expected to grow steadily. Meanwhile, as manufacturing processes undergo refinement and innovative conductive fillers are developed, these composite materials will see enhanced performance, providing robust support for the commercialization of fuel cell applications.