TWM264664U - Bipolar plate for air-cooled proton exchange membrane fuel cell stack - Google Patents

Description

M264664 Hook, creation instructions (1) To improve the middle of the battery pack [Technical field to which the new type belongs This design is the design of the fuel cell 1, the form of the main electrode plate. i [Prior art] Fuel cells are devices that convert hydrogen ββ | 丄 to you. It is characterized by producing only two Is which are converted from electrochemical reactions into electricity generating devices. …, And 7 ′ are therefore a very environmentally friendly power source. If you need to change the fuel pressure of the membrane, you need to separate multiple single power sources *. A larger voltage is required on the right. Stacking of battery packs: ί f: forming a battery pack to improve the electric electrode group / bipolar plate ... dual-core current collecting plate / unipolar plate / membrane conductive stone n membrane electrode group is a single battery, bipolar plate a A galvanized graphite or metal plate is connected in series with the female lead battery of the lightning guide handle that is prepared for contacting the collector plate, and the current is blown through the current collecting plate through the current collecting plate. The nameplate is used to loosen the entire battery pack. When the membrane electrode group generates electricity, it also generates heat and water at the same time. = When the heat is removed, the energy of the group will be affected. If u cannot be discharged quickly, it will also block the flow of the reaction gas and cause U ί = ί 二 Therefore, a well-designed battery pack must not only be able to distribute the gas ϊ = pole group to exert the performance of each, but also to remove the heat and i of j to maintain long-term operation. Air-cooled fuel cells available in the market

M264664 Fourth, creation instructions (2)

Ballard's 1.2KW air-cooled battery pack and American H-Power's 250 and 500W battery packs. The patent US 6 0 6 6 4 0 9 issued by Baiiard Company can know the cooling method designed for its battery pack. Each bipolar plate is a combination of two conductive carbon plates with hydrogen and air flow channels on both sides. 'The middle sandwich part is a linear cooling flow path, and the cooling fan sends cold air from the environment into the cooling flow path to dissipate heat. Since each bipolar plate is a combination of two pieces, the volume and weight increase a lot, which is not conducive to the development of a portable power system. Η-The design of Power Company can refer to the US patent US 5 7 7 6 6 2 5 and its invention is characterized by the establishment of two-way flow channels on the two sides of the bipolar plate, because the more end gas in the flow channel will carry more reaction and produce Water, which can compensate for the insufficient moisture of the dry gas just flowing in the adjacent flow channel. Therefore, the inlet of each flow channel is juxtaposed with the outlet of the adjacent flow channel. In order not to mix the gas at the inlet and the outlet, it is necessary to add bolts near these holes to keep the airtight. Its commercial battery pack has 27 fixing bolts, which not only increases weight but also increases assembly costs. [New content] The purpose of this creation is to design an air-cooled proton exchange membrane fuel cell stack, so that the power density per unit volume is large, the airtightness is good, the heat dissipation and drainage effect is good, and the assembly is easy. Can fully play. The bipolar plate occupies a major part of the volume of the battery pack, so the form of the bipolar plate will affect the overall performance of the battery pack. The bipolar plate of this creation can make argon and air flow in opposite directions to achieve equilibrium humidity of the proton exchange membrane, and Fixed bolt hole position setting

M264664 4. Creation instructions (3) on the heat sink fins to reduce volume waste. The fuel cell stack of this creation is shown in Figure 1. An upper current collecting plate 6a, a bipolar plate 2, and a lower current collecting plate 6b are stacked between the upper name plate 1a and the lower aluminum plate lb. A membrane electrode group 4 is sandwiched between the bipolar plates and sealed by an airtight gasket 3. Completed after locking with the fixing bolt 5. Hydrogen flows through the inlet 3 1 a of the upper aluminum plate through the hydrogen inlet main channel 3 1 b, and then is distributed to the electrode reaction area, and then flows through the nitrogen outlet main channel 3 1 c to the outlet 3 1 d of the lower plate. The air flows from the inlet 2 1 a through the air inlet main channel 2 1 b of the bipolar plate, and then distributes to the electrode reaction area, and then flows through the air outlet main channel 2 1 c to the lower aluminum plate outlet 21d and is discharged. Double, ^ The main function is to guide the reaction gas to the area of the electrode of the reaction, = the side is the anode, the side that guides the air is the cathode, and the other side is the wide range produced by the hydrogen inlet. The area at the Hangong rolling exit is degrees. Area, so we can equalize the wet cell of the proton exchange membrane, and 1, 1, 'a leaves the four main flow channel holes of the gas in a square, which will reduce; the material, because the gas used is dry During the reaction process, the humidity of the film is combined to reduce the performance. But in the membrane, you can maintain a certain degree of performance if you use these water to wet the proton exchange gas flow direction, 2 properties. During the reaction, moisture will follow the gas flow near the gas inlet, and the direction of gas flow on both sides of the fruit will be the same, but it will be wet. In this creation, = the membrane change is relatively dry, and the vicinity of the exit is biased, as shown in Figure 2, 々5 'the flow direction of oxygen is opposite to the flow direction of air. It will be wet near the exit, but just rolled into D area. Conversely, the area at the air outlet is

M264664 IV. Creation instructions (4) Four sides of the electrode. However, because the mainstream channel holes do not need to be too large, the graphite plate is not fully utilized, which will increase the weight of the battery pack. In this creation, the shape of the electrode is designed to be rectangular, and the positions of the main channel holes of the gas inlet and outlet are separated on two short sides to make full use of each area. As shown in Figure 3. The heat generated in the reaction process will also increase the temperature of the battery pack. Too high a temperature will make the proton-exchange membrane too dry and reduce its conductivity. Therefore, it is necessary to increase the heat dissipation fins to increase the heat dissipation area. In order to reduce volume waste, the holes of the fixing bolts are set on the heat sink fins, that is, the bolts are set inside the battery pack, and the bolts can be used for positioning, so that each bipolar plate can be easily aligned during assembly.

It is necessary to maintain airtightness around the reaction electrode and around the main channel. Therefore, it is necessary to surround the periphery of the reaction electrode with an airtight gasket 3 to prevent the communication between the anode and the cathode. Except for the electrode reaction area and the main flow channel holes of the gas inlet and outlet on the bipolar plate, the rest is used as the airtight gasket area, and the width of the airtight gasket is 3 to 5 mm, as shown in Figure 4. [Embodiment] Example 1:

The unipolar plate is a thin sheet made of graphite. Its appearance is as shown in Figure 3. The dimensions are 80 mm x 160 mm x 2 mm. The size of the intermediate reaction electrode area is 40 mm X 130 mm. The width of the heat sink fins on both sides is 15 mm. , The thickness is 1.5 mm, with 3 fixing bolt holes drilled on each side, the interval is 45 mm; the main hydrogen channel inlet and outlet dimensions are 4 mm X 6 mm; the main air channel inlet and outlet dimensions are 4 mm x25 mm. The shape of the membrane electrode group is shown as 4 in Figure 2.

Page 9 M264664

Page ίο M264664 Brief description of the drawings Figure 1: Exploded view of the fuel cell stack of this creation. 1 a: upper nameplate 1 b: lower aluminum plate 2: bipolar plate 3: airtight gasket 4: membrane electrode group 5: fixed bolt lock 6a: upper current collecting plate 6b: lower current collecting plate 21a: upper aluminum plate Air inlet 2 1 b: Bipolar plate air inlet mainstream channel 2 1 c: Bipolar plate air outlet mainstream channel 21d: Lower aluminum plate air outlet 31a: Upper aluminum plate hydrogen inlet 3 1 b: Bipolar plate hydrogen inlet Main flow path 3 1 c: Hydrogen outlet of bipolar plate Main flow path 3 1 d: Hydrogen outlet of lower aluminum plate Figure 2: Membrane electrode group and gas flow direction. 4: Membrane electrode group 2 0 b: Air flow direction 3 0 b: Hydrogen flow direction Figure 3: Bipolar plate design.

M264664

Brief description of the diagram on page 12 2: Bipolar plate 20a air flow channel 21b Bipolar plate air in α main channel 21c Bipolar plate air out α main channel 30a Hydrogen flow channel 31b Bipolar plate hydrogen in D main channel 31c Hydrogen outlet main channel of bipolar plate 50 Fixing bolt hole position 60 Radiating fins Figure 4: Form of airtight gasket 0 Figure 5: Single cell performance curve 0 Figure 6: Battery pack performance curve 0 7 Figure: Long-term performance test chart of the battery pack

Claims (1)

M264664 6. Scope of patent application ..., two "" 1. A bipolar plate of an air-cooled proton exchange membrane fuel cell stack, the form is: (1) the shape is rectangular, the middle is the electrode reaction area, and the two long sides are for heat dissipation The main inlets and outlets of the fins, hydrogen and air are on the two short sides respectively. The inlet of the main flow of hydrogen and the outlet of the main flow of air are side by side. The inlet of the main flow of air and the outlet of the main flow of hydrogen are side by side. One short side allows the two gases to flow toward each other; (2) There are fixing bolt holes on the heat sink fins; (3) The electrode reaction area on the bipolar plate, the main gas inlet / outlet and the area outside the heat sink fins are airtight Shim area. 2. If the scope of the patent application is the first bipolar plate of an air-cooled proton exchange membrane fuel cell stack, the fixing bolt holes on the heat sink fins are also the positioning holes during assembly. 3. If the scope of the patent application is the first bipolar plate of an air-cooled proton exchange membrane fuel cell stack, the width of the airtight gasket area is 3 to 5 mm. Page 13