Fuel cell end plate

Abstract

The utility model relates to a fuel cell end plate which comprises a fuel cell cooling liquid inlet and outlet, a cooling liquid flow channel and an electric heater, cooling liquid flows through the fuel cell end plate flow channel, the cooling liquid can be heated through the electric heater, on one hand, the fuel cell end plate can be heated, and on the other hand, after the cooling liquid is heated, the fuel cell end plate can be heated. And introducing into the fuel cell stack so as to realize the low-temperature starting of the fuel cell stack. The utility model relates to an integrated design of a fuel cell end plate, can integrate an electric heater and a cooling liquid flow channel, and is characterized in that the fuel cell end plate with the integrated design has a cooling liquid heating function, and low-temperature starting of a fuel cell is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of instant liquid-cooled fuel cell low temperature start integrated end plate, specifically, cooling liquid passage is formed between the outer surface of end plate and electric heater, cooling liquid is circulated by water pump, end plate and electric pile can be heated by electric heater, to realize the integrated end plate of fuel cell low temperature start. BACKGROUND

[0002] Hydrogen fuel cell is a kind of electrochemical power generation device for hydrogen and oxygen as raw material to carry out electrochemical reaction to generate water, while chemical energy is converted into electric energy. In the application of fuel cell, low temperature start and low temperature operation become the inevitable problem faced, because water produced by chemical reaction can penetrate into the anode cavity of single cell and remain in the internal of hydrogen fuel cell stack, in the low temperature environment below freezing point, liquid water in the internal of fuel cell will freeze, block the hydrogen cavity of fuel cell single cell, affect the entry of hydrogen, the reaction heat generated when fuel cell starts is not enough to dissolve ice, which affects the start of fuel cell.

[0003] In the existing low temperature start and low temperature operation technology, external lithium battery is used to heat and start fuel cell cooling liquid through electric heater, and circulation is carried out through valve, although low temperature start of fuel cell can be realized, electric heater only heats cooling liquid, low temperature start efficiency is low, and the system is complex. CONTENT OF THE UTILITY MODEL

[0004] To achieve the above object, the utility model adopts the following scheme: a fuel cell end plate, including end plate, electric heater and cooling module;

[0005] The end plate includes end plate cooling liquid inlet and end plate cooling liquid outlet;

[0006] The end plate cooling liquid outlet is connected with the cooling module inlet,

[0007] Flow channel is arranged between the end plate and the electric heater;Flow channel inlet is connected with cooling module outlet,

[0008] Flow channel inlet is communicated with end plate cooling liquid inlet through flow channel, and the electric heater covers the surface of flow channel;

[0009] Flow channel outlet is connected with fuel cell cooling liquid inlet end, and cooling liquid flows through fuel cell stack.

[0010] Further, the flow channel is arranged on the upper surface of the end plate or arranged on the electric heater or a separate flow channel slot, and sealed by a sealing ring.

[0011] Further, the flow channel adopts serpentine series flow field or multi-channel parallel flow field.

[0012] Further, the upper surface of the end plate is concave.

[0013] Further, the contact area between the flow channel and the electric heater is greater than 60% of the heater contact plane.

[0014] The utility model discloses a fuel cell end plate, through the end plate of integrated electric heater, simplify low temperature starting system, reduce the end plate effect of low temperature starting, reach the purpose that fuel cell electric pile low temperature quick start.

[0015] The utility model has the following advantages:

[0016] Through the end plate of integrated electric heater, the coolant is heated at one time, and the electric pile end plate is heated, the end plate effect of low temperature starting is reduced, the fuel cell electric pile is heated, and the fuel cell electric pile is quickly started at low temperature. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the end plate structure diagram of integrated electric heater;

[0018] Figure 2 It is the end plate structure explosion drawing of integrated electric heater.

[0019] Reference signs: 1, end plate coolant outlet, 2, end plate cooling module inlet, 3, cooling module outlet, 4, flow channel inlet, 5, coolant inlet. DETAILED DESCRIPTION

[0020] The application will be further described in detail below in combination with the drawings and examples.

[0021] Figure 1 It is the end plate structure diagram of integrated electric heater;

[0022] Figure 2 It is the end plate structure explosion drawing of integrated electric heater.

[0023] A kind of fuel cell end plate, including end plate, electric heater and cooling module;

[0024] The end plate includes end plate coolant inlet 5 and end plate coolant outlet 1;

[0025] The cooling liquid outlet 1 is connected with cooling module inlet 2,

[0026] Flow channel is arranged between the end plate and the electric heater;Flow channel inlet 4 is connected with cooling module outlet 3,

[0027] Flow channel inlet 4 is communicated with end plate coolant inlet 2 by flow channel, and the electric heater covers flow channel surface;

[0028] The flow channel outlet is connected with the fuel cell cooling liquid inlet end, and the cooling liquid flows through the fuel cell stack.

[0029] Further, the flow channel is formed between the electric heater and the end plate, which can be arranged on the end plate, the electric heater or a separate flow channel groove, sealed by a sealing ring, and the cooling liquid flows in the flow channel.

[0030] Further, the flow channel adopts a serpentine series flow field or a multi-channel parallel flow field.

[0031] Further, the upper surface of the end plate is recessed in the center, which can embed the electric heater into the end plate, and the overall end plate outer surface is flat.

[0032] Further, the contact area between the flow channel and the electric heater is greater than 60% of the heater contact plane.

[0033] The cooling liquid is heated after passing through the flow channel once, without the need for size cycle switching for electric heating.

[0034] Embodiment 1: The cooling module adopts a water pump, a fuel cell end plate, which includes an end plate cooling liquid inlet and an end plate cooling liquid outlet, and integrates an electric heater, the water pump is arranged above the electric heater, the end plate cooling liquid outlet 1 is connected with the water pump inlet, the flow channel is formed between the electric heater and the end plate, the water pump outlet is connected with the flow channel inlet 4, the flow channel inlet 4 is communicated with the end plate cooling liquid inlet 5 through the flow channel, the flow channel surface is covered with the electric heater, the cooling liquid flows through the cooling liquid flow channel by rotating the water pump, is heated by the electric heater, the cooling liquid flowing through the flow channel is heated, and enters the fuel cell cooling liquid inlet end 5, the cooling liquid flows through the fuel cell stack, flows out from the side of the end plate cooling liquid outlet 1, thereby forming a cooling liquid circulation, the cooling liquid and the end plate are heated by the electric heating sheet, and low-temperature starting of the fuel cell stack is realized.

[0035] In a 50W fuel cell system, in a-40℃ environment, after standing for 12h, an electric heating integrated end plate is used, a 55W electric heater is used, the cooling liquid flow is 100ml / min, the cooling liquid is heated to 10℃ after 10min, hydrogen and air are introduced into the fuel cell stack, no single cell single low phenomenon occurs at the fuel cell end plate, the fuel cell is started smoothly, and is loaded to 50W after 5min, the fuel cell stack is started quickly, and reaches full power operation.

Claims

1. A fuel cell end plate characterized by: Includes end plates, electric heaters, and cooling modules; The end plate includes an end plate coolant inlet and an end plate coolant outlet; The end plate coolant outlet is connected to the cooling module inlet. A flow channel is provided between the end plate and the electric heater; the inlet of the flow channel is connected to the outlet of the cooling module. The flow channel inlet is connected to the end plate coolant inlet through the flow channel, and the electric heater covers the surface of the flow channel; The outlet of the flow channel is connected to the inlet of the fuel cell coolant, and the coolant flows through the fuel cell stack.

2. The fuel cell end plate according to claim 1, characterized in that: The flow channel is located on the upper surface of the end plate, or is set on the electric heater, or is a separate flow channel groove, and is sealed by a sealing ring.

3. A fuel cell end plate according to claim 1, characterized in that: The flow channel adopts a serpentine series flow field or a multi-channel parallel flow field.

4. A fuel cell end plate according to claim 1, characterized in that: The upper surface of the end plate has a recessed structure at its center.

5. A fuel cell end plate according to claim 1, characterized in that: The contact area between the flow channel and the electric heater is greater than 60% of the contact plane of the heater.

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