ENGAGEMENT-TYPE ULTRA-THIN METAL BIPOLAR PLATE AND THREE-DIMENSIONAL FLOW FIELD THEREOF

摘要

An engagement-type ultra-thin metal bipolar plate for a fuel cell. The bipolar plate comprises two metal monopolar plates (1), wherein each of the metal monopolar plates is provided with multiple recessed flow channels (2); the flow channels serve as flow field troughs; the part between adjacent flow channels is a flow field ridge; the section of each of the flow channels is of a trapezoid shape in the widthwise direction, and the section thereof is of a wave shape in the lengthwise direction; the flow field ridge of one monopolar plate is inserted into the flow field trough of the other monopolar plate; and the two metal monopolar plates engage in a trough of the wave shape. Through the design of a "trapezoid and wave" flow field, the metal bipolar plate can realize three-dimensional fuel gas transmission, can also realize engagement-type combination of the two monopolar plates in the "trough" of the "trapezoid and wave" flow field, and can form a flow field for a cooling liquid in a hollow part of the bipolar plate using a "peak" of the flow field of the wave shape. Through the design of the engagement-type metal bipolar plate, the thickness of the bipolar plate can be further reduced to realize the design and forming of the ultra-thin metal bipolar plate, and the flow field for the cooling liquid or cooling gas is also retained.