A graphite-metal frame composite bipolar plate and its preparation method
A metal frame and bipolar plate technology, applied to battery electrodes, structural parts, electrical components, etc., can solve the problems of high cost and difficult surface modification of metal plates, and achieve enhanced bending strength, good electrical conductivity, and increased overall The effect of intensity
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Embodiment 1
[0062] A preparation method of graphite-metal frame composite bipolar plate:
[0063] 1) Preparation of graphite plate: Put 65wt% of artificial graphite, 20wt% of phenolic resin, 15wt% of carbon nanotubes and carbon black and other additives into a high-speed stirrer for mixing for 20 minutes. Then, the mixture is put into a twin-screw extruder for kneading and granulation, and graphite plates with fuel flow channels 8 and oxidant flow channels 12 are prepared respectively by extrusion and calendering. The thickness of the graphite plates is 0.8 mm, the fuel flow channel and the oxidant flow channel are concave-convex structures, the flow channel depth is 0.3mm, and the width is 1mm.
[0064] 2) Preparation of the metal frame of the anode plate: a 0.1 mm thick stainless steel 316 plate is stamped and formed in a mold, and the metal frame 401 of the anode plate after stamping is distributed with a first fuel inlet 101, a second fuel inlet 102, a first Fuel outlet 201, second f...
Embodiment 2
[0068] A preparation method of graphite-metal frame composite bipolar plate:
[0069] 1) Put 70wt% of expanded graphite, 15wt% of polypropylene, 15wt% of carbon nanotubes and copper powder and other additives into a high-speed stirrer for mixing for 30 minutes. Then, the mixture is molded to prepare graphite plates with fuel flow channels 8 and oxidant flow channels 12 respectively. The thickness of the graphite plate is 1.0mm, and both the fuel flow channels and the oxidant flow channels are concave-convex structures. The depth of the runners is 0.4mm and the width is 1mm.
[0070] 2) Preparation of the metal frame of the anode plate: the same as in Example 1, the difference is that the 0.1 mm thick stainless steel 316 plate is replaced with a 0.2 mm thick titanium alloy TC4 plate.
[0071] 3) Preparation of the metal frame of the cathode plate: the same as in Example 1, the difference is that the 0.1 mm thick stainless steel 316 plate is replaced with a 0.2 mm thick titaniu...
Embodiment 3
[0074] 1. Preparation of graphite-metal frame composite bipolar plate
[0075] 1) Put 75wt% of natural graphite, 20wt% of polyethylene, 10wt% of carbon fiber and carbon black and other additives into a high-speed stirrer for mixing for 30 minutes. Then, the mixed materials are injected into graphite plates with fuel flow channels 8 and oxidant flow channels 12 respectively. The thickness of the graphite plates is 1.2mm, and both the fuel flow channels and the oxidant flow channels have a concave-convex structure. The depth of the runners is 0.3mm and the width is 1mm.
[0076] 2) Preparation of the metal frame of the anode plate: the same as in Example 1, the difference is that the 0.1 mm thick stainless steel 316 plate is replaced by the 0.2 mm thick stainless steel 304 plate.
[0077] 3) Preparation of the metal frame of the cathode plate: the same as in Example 1, the difference is that the 0.1 mm thick stainless steel 316 plate is replaced by a 0.2 mm thick stainless stee...
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