A bipolar board for new proton exchange film fuel battery and its making method
A proton exchange membrane, fuel cell technology, applied in fuel cells, fuel cell parts, battery electrodes, etc., can solve the problem of increasing system complexity and instability, resin diffusion and adsorption inhomogeneity, bipolar plate performance Instability and other problems, to achieve the effect of reducing material cost, good flatness, and low contact resistance
Active Publication Date: 2008-09-10
SUNRISE POWER CO LTD
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Problems solved by technology
The bipolar plate is firstly pressed to form flexible graphite and then filled with glue. The adhesive is polyvinylidene fluoride. The disadvantage is that the pressing process is complicated. The hydrogen flow field plate is difficult to form due to the flow field on both sides, and it is easily broken, resulting in waste products. high rate
The disadvantage of this method is that due to the inhomogeneity of the plate itself and the difference in the surface of the particles and the porosity of the plate, it is easy to cause the inhomogeneity of resin diffusion and adsorption, resulting in unstable performance of the bipolar plate, and due to the bipolar The gas permeability of the plate is relatively high, so when the bipolar plate is applied to a fuel cell engine, a hydrogen elimination system must be added, which increases the complexity and instability of the system
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[0017] According to the above inventive concept, the bipolar plate of the proton exchange membrane fuel cell is manufactured. First, make a high-density flexible graphite thin plate: choose a density of 0.2g / cm 3 According to the flexible graphite plate of phenolic formaldehyde: 5wt%, epoxy resin: 5wt% and ethanol: 90wt% preparation resin solution, the resin solution is impregnated flexible graphite plate under the condition that vacuum degree is-0.09Mpa, after drying, press into density 1.3g / cm 3 High-density thin graphite plate, in which the resin is cured at 200°C to form a graphite plate after curing. Then, choose a density of 1.0g / cm 3 The flexible graphite plate suppresses hydrogen, oxygen and water flow field plates. Epoxy laminates are used to make the frame of the water cavity. Finally, the water cavity frame made of epoxy resin laminates is bonded around the water flow field plate made of medium-density flexible graphite plate with adhesive, and two high-density ...
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Abstract
The invention relates to a novel bipolar plate of proton exchange membrane fuel cell, which is composed of five layers of structure. The middle layer is a water-flow field plate made of a flexible graphite plate with medium density and a water chamber frame made of a laminated resin plate arranged at the periphery of the water-flow field plate; two sides of the water-flow field plate are two pieces of flexible graphite thin flat plate with high density; the sides of the two pieces of high-density flexible graphite thin flat plate against the water-flow field plate are respectively a hydrogen-flow filed plate and an oxygen-flow field plate made of the medium density-flexible graphite plate. The novel bipolar plate of proton exchange membrane fuel cell of the invention has the advantages that: the flow field plate and the electrode plate are separately arranged, which facilitates the production, the structure of the flow field is easier to change according to different conditions; meanwhile, when the high-density flexible graphite flat plate is produced, no cracks occur and the air permeability of the bipolar plate is reduced; in addition, the high-density flexible graphite flat plate can be made as thin as possible, thereby reducing the thickness of the bipolar plate, enhancing the smoothness and the product qualification rate of the bipolar; besides, the production equipment of the bipolar plate of the invention is simple and mass production is easy to be carried out.
Description
technical field [0001] The invention belongs to the field of proton exchange membrane fuel cells, in particular to the bipolar plate technology for proton exchange membrane fuel cells. Background technique [0002] The fuel cell bipolar plate (including the flow field) is one of the key components of the fuel cell. At present, bipolar plates mainly include metal bipolar plates and graphite bipolar plates. Among the graphite-type bipolar plates, flexible graphite is a very suitable material for fuel cell bipolar plates. In the prior art, the technologies for manufacturing bipolar plates with flexible graphite mainly include: [0003] WO0041260 patent provides a bipolar plate with a two-layer structure, the hydrogen flow field plate and the water cavity are used as a plate, the oxygen flow field plate is used as a plate, and the two plates are bonded together to form a bipolar plate. The bipolar plate is firstly pressed to form flexible graphite and then filled with glue. Th...
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Login to View More IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/0228H01M8/0258
CPCY02E60/50Y02P70/50
Inventor 罗晓宽傅云峰徐洪峰侯中军
Owner SUNRISE POWER CO LTD