Fuel cell flow field plate for combined cooling of water cooling and air cooling

Abstract

The utility model relates to a fuel cell flow field plate for combined cooling of water cooling and air cooling, which comprises a rectangular graphite plate, water cooling channels and hydrogen channels are formed on the upper side and the lower side of the graphite plate, and a plurality of vertically distributed air flow grooves are formed on the front end face of the graphite plate. An air outlet and an air inlet penetrating through the rear end face of the graphite plate are formed in two ends of the air flow groove respectively; an air outlet notch and an air inlet notch which are communicated with the air outlet hole and the air inlet hole are respectively formed in two side edges of the graphite plate. According to the flow field plate, a plurality of air inlets are formed in the side edge of the flow field plate and matched with a designed large-flow air groove, a common fan can be adopted for air supply and oxygen supply, meanwhile, a water pump can be adopted for cooling to be matched with a cold water system of an electric pile for cooling, and uniform temperature control and oxygen supply can be guaranteed.

Description

Technical Field:

[0001] The utility model relates to the technical field of fuel cells, and more specifically, to a fuel cell flow field plate for combined water cooling and air cooling. Background Art:

[0002] At present, a flow field plate is provided in a fuel cell. The flow field plate is generally a plate body made of graphite, that is, the main body of the flow field plate is a graphite plate. Hydrogen flow channels or air flow channels are respectively provided on the graphite plate. Taking the graphite plate with an air flow groove as an example, a continuous S-shaped air flow channel is provided on the side of the graphite plate close to the proton exchange membrane. Hydrogen channels and air channels are respectively provided at the upper and lower ends of the flow channel. The two ends of the air flow channel are respectively communicated with the air channel; the flow field plate with this structure is suitable for small-power and air-cooled fuel cells. However, for high-power fuel cells, the fuel cell stack cooled by air cooling generally has problems of low performance and short life. The main reason is that the oxygen supply and heat dissipation of the air-cooled stack are the same fan, and the oxygen supply and heat dissipation are very uneven, which in turn causes low performance and short life of the stack; therefore, high-power stacks all use water-cooled stacks, but the oxygen supply flow channel of the water-cooled stack is small, and a high-pressure blower must be used to meet the oxygen supply. At present, some small-power stacks are designed as water-cooled stacks, but there is no suitable high-pressure blower for oxygen supply. The high-pressure blowers used in the experiments either have a short life or insufficient oxygen supply. Therefore, other ways need to be considered for cooling and oxygen supply, such as considering adding air cooling for oxygen supply, and at the same time, the cooling effect can be improved. Summary of the Utility Model:

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a fuel cell flow field plate for combined water cooling and air cooling, which has a plurality of air inlets opened on the side of the flow field plate, and cooperates with a designed large-flow air groove, can use a common blower for air supply, and at the same time can use a water pump for cooling in cooperation with the cold water system of the stack for cooling, and can ensure uniform temperature control and meet the oxygen supply.

[0004] A fuel cell flow field plate for combined water cooling and air cooling includes a rectangular graphite plate. Water cooling channels and hydrogen channels are formed on both the upper and lower sides of the graphite plate. A plurality of vertically distributed air flow grooves are formed on the front end face of the graphite plate. An air outlet hole and an air inlet hole penetrating the rear end face of the graphite plate are respectively formed at both ends of the air flow groove; air outlet grooves and air inlet grooves communicated with the air outlet hole and the air inlet hole are respectively formed on both side edges of the graphite plate.

[0005] Preferably, the air flow grooves are vertically and evenly distributed on the graphite plate, and the water cooling channels and the hydrogen channels are respectively located on the upper and lower sides of the air flow grooves;

[0006] On the front end faces of the graphite plates around the air flow channel, water cooling channel and hydrogen channel, front sealing grooves are respectively formed. On the rear end faces of the graphite plates around the water cooling channel and hydrogen channel, rear sealing grooves are respectively formed.

[0007] Preferably, the front sealing groove includes a rectangular main ring groove. The air flow channel is located within the main ring groove. On the upper and lower sides of the main ring groove, two laterally parallel sub-ring grooves are respectively provided. The rear sealing groove consists of two vertically distributed rear ring grooves which are distributed on the upper and lower sides of the air outlet groove and air inlet groove. A vertical partition groove is provided within the rear ring groove. The water cooling channel and hydrogen channel are respectively located within the sub-ring groove of the front sealing groove and the rear ring groove of the rear sealing groove.

[0008] Preferably, the air outlet groove and air inlet groove respectively penetrate through the rear end faces on both sides of the graphite plate.

[0009] Preferably, the air inlet holes on one side of the graphite plate are inclined. The cross-section of the air inlet groove is in the shape of a right trapezoid. The depth of the inlet end of the air inlet groove is greater than the depth of the end where the air inlet groove communicates with the air inlet groove.

[0010] Preferably, a flared mouth is formed at the inlet end of the air inlet groove on the graphite plate.

[0011] The beneficial effects of the present utility model are as follows:

[0012] Multiple air inlets are provided on the side of the flow field plate of the present flow field plate. In cooperation with the designed large-flow air groove, an ordinary fan can be used for air supply, and at the same time, a water pump can be used for cooling in cooperation with the cold water system of the fuel cell stack, which can ensure uniform temperature control and meet the oxygen supply. Description of the drawings:

[0013] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0014] Figure 2 is a three-dimensional structural schematic diagram of the present utility model from another angle;

[0015] Figure 3 is a front view structural schematic diagram of the present utility model;

[0016] Figure 4 is Figure 3 the cross-sectional structural schematic diagram at A-A in

[0017] In the figure: 1. Graphite plate; 11. Water cooling channel; 12. Hydrogen channel; 13. Air flow channel; 14. Front sealing groove; 15. Air outlet hole; 16. Air inlet hole; 17. Air outlet groove; 18. Air inlet groove; 19. Flared mouth; 110. Rear sealing groove. Detailed implementation manners:

[0018] Example: See Figures 1 to 4As shown in the figure, a fuel cell flow field plate for combined water cooling and air cooling includes a rectangular graphite plate 1. Water cooling channels 11 and hydrogen channels 12 are formed on the upper and lower sides of the graphite plate 1. The width of the water cooling channel 11 is greater than that of the hydrogen channel 12. A number of vertically distributed air flow grooves 13 are formed on the front end face of the graphite plate 1. An air outlet hole 15 and an air inlet hole 16 penetrating the rear end face of the graphite plate 1 are respectively formed at both ends of the air flow groove 13. Air outlet grooves 17 and air inlet grooves 18 communicating with the air outlet hole 15 and the air inlet hole 16 are respectively formed on both sides of the graphite plate 1.

[0019] The air flow grooves 13 are vertically and evenly distributed on the graphite plate 1. The water cooling channels 11 and the hydrogen channels 12 are respectively located on the upper and lower sides of the air flow grooves 13.

[0020] Front sealing grooves 14 are respectively formed on the front end face of the graphite plate 1 around the air flow grooves 13, the water cooling channels 11 and the hydrogen channels 12. Rear sealing grooves 110 are respectively formed on the rear end face of the graphite plate 1 around the water cooling channels 11 and the hydrogen channels 12, as Figure 1 , 2 shown.

[0021] The front sealing groove 14 includes a rectangular main ring groove. The air flow groove 13 is located in the main ring groove. Two horizontally parallel sub-ring grooves are respectively arranged on the upper and lower sides of the main ring groove. The rear sealing groove 110 consists of two upper and lower rear ring grooves. The rear ring grooves are distributed on the upper and lower sides of the air outlet groove 17 and the air inlet groove 18. Vertical partition grooves are arranged in the rear ring grooves. The water cooling channels 11 and the hydrogen channels 12 are respectively located in the sub-ring grooves of the front sealing groove 14 and the rear ring grooves of the rear sealing groove 110. The front side of the graphite plate 1 is sealed by arranging front sealing parts corresponding to the shape of the front sealing groove 14 in the front sealing groove 14, and the front sealing parts are distributed to seal the water cooling channels 11, the hydrogen channels 12 and the air flow grooves 13 on the front side of the graphite plate 1. And rear sealing parts are arranged in the rear sealing groove 110, and the rear sealing parts are used for sealing the water cooling channels 11 and the hydrogen channels 12 on the rear side of the front side of the graphite plate 1.

[0022] The air outlet groove 17 and the air inlet groove 18 respectively penetrate the rear end faces on both sides of the graphite plate 1. For example, when machining the slot holes and slot channels on the graphite plate 1 by engraving, it is convenient to engrave the air outlet groove 17 and the air inlet groove 18.

[0023] The air inlet hole 16 on one side of the graphite plate 1 is inclined. The cross section of the air inlet groove 18 is in the shape of a right trapezoid. The depth of the inlet end of the air inlet groove 18 is greater than the depth of the end communicating with the air inlet groove 18. As Figure 4 shown, the inclined air inlet hole 16 cooperates with the right trapezoid-shaped air inlet groove 18 to facilitate air intake into the air flow groove 13 of the graphite plate 1 and ensure the oxygen supply for the fuel cell reaction.

[0024] A flared opening 19 in the shape of a horn is formed at the inlet end of the air inlet slot 18 on the graphite plate 1. The structure of the flared opening 19 is the same, which is convenient for air intake.

[0025] Working principle: This product is a fuel cell flow field plate used for combined water cooling and air cooling. The main technical point of the fuel cell flow field plate is to open a plurality of air inlet slots 18 on the side of the graphite plate 1, and then open corresponding air outlet slots 17 on the side of the graphite plate 1. When the fuel cell is assembled, while the fuel cell water cooling system is operating, a fan is provided on one side of the fuel cell. The airflow generated by the fan can enter the air flow channel 13 from the air inlet slot 18 to provide sufficient oxygen for the reaction, and the excess air can be discharged from the air outlet slot 17.

[0026] While meeting the oxygen supply, the air flow can also take away the heat generated by the fuel cell reaction, that is, the structure of water cooling and air cooling is realized, which can further improve the heat dissipation and cooling efficiency of the fuel cell.

[0027] The described embodiments are used to illustrate the present invention by way of example, rather than to limit the present invention. Any person skilled in the art can modify the described embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of the rights protection of the present invention should be as listed in the claims of the present invention.

Claims

1. A fuel cell flow field plate for combined water cooling and air cooling, comprising a rectangular graphite plate (1). Water cooling channels (11) and hydrogen channels (12) are formed on both the upper and lower sides of the graphite plate (1). A plurality of vertically distributed air flow grooves (13) are formed on the front end face of the graphite plate (1), and it is characterized in that: Both ends of the air flow channel (13) are respectively formed with an air outlet hole (15) and an air inlet hole (16) that penetrate through the rear end face of the graphite plate (1); both side edges of the graphite plate (1) are respectively formed with an air outlet groove (17) and an air inlet groove (18) that communicate with the air outlet hole (15) and the air inlet hole (16).

2. A fuel cell flow field plate for combined water-cooling and air-cooling cooling according to claim 1, characterized in that: The air flow channels (13) are vertically and uniformly distributed on the graphite plate (1), and the water cooling channel (11) and the hydrogen channel (12) are respectively located on the upper and lower sides of the air flow channel (13); Front sealing grooves (14) are respectively formed on the front end face of the graphite plate (1) around the air flow channel (13), the water cooling channel (11) and the hydrogen channel (12), and rear sealing grooves (110) are respectively formed on the rear end face of the graphite plate (1) around the water cooling channel (11) and the hydrogen channel (12).

3. The fuel cell flow field plate for combined water cooling and air cooling according to claim 2, characterized in that: The front sealing groove (14) includes a rectangular main ring groove, the air flow channel (13) is located in the main ring groove, and two horizontally parallel sub-ring grooves are respectively arranged on the upper and lower sides of the main ring groove; the rear sealing groove (110) consists of two upper and lower rear ring grooves, the rear ring grooves are distributed on the upper and lower sides of the air outlet groove (17) and the air inlet groove (18), and a vertical partition groove is arranged in the rear ring groove; the water cooling channel (11) and the hydrogen channel (12) are respectively located in the sub-ring groove of the front sealing groove (14) and the rear ring groove of the rear sealing groove (110).

4. A fuel cell flow field plate for combined water-cooling and air-cooling according to claim 2, characterized in that: The air outlet groove (17) and the air inlet groove (18) respectively penetrate through the rear end faces on both sides of the graphite plate (1).

5. A fuel cell flow field plate for combined water-cooling and air-cooling according to claim 4, characterized in that: The air inlet hole (16) on one side of the graphite plate (1) is inclined, the cross section of the air inlet groove (18) is in the shape of a right trapezoid, and the depth of the inlet end of the air inlet groove (18) is greater than the depth of the end where the air inlet groove (18) communicates with the air inlet groove (18).

6. A fuel cell flow field plate for combined water-cooling and air-cooling cooling according to claim 5, characterized in that: A flared mouth (19) in the shape of a horn is formed at the inlet end of the air inlet groove (18) on the graphite plate (1).

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