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Bipolar plate structure and fuel cell

A bipolar plate and unipolar plate technology, applied in fuel cells, fuel cell parts, circuits, etc., can solve the problems of uneven gas distribution and the inability to effectively enlarge the area of ​​the reaction zone, and achieve the number of flow channels. Uniform, wide-ranging effect

Pending Publication Date: 2020-09-22
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the bipolar plate in the prior art that the gas distribution is uneven due to the single gas inlet and outlet structure, and the area of ​​the reaction zone cannot be effectively enlarged, thereby providing a bipolar plate structure and fuel cells

Method used

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  • Bipolar plate structure and fuel cell
  • Bipolar plate structure and fuel cell
  • Bipolar plate structure and fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0073] The pattern mentioned in the specific embodiment above needs to open two molds to punch out two patterns, A and B, and then overlap the positional relationship to form a smooth gas and cooling water inlet and outlet.

[0074] Under the condition that the basic flow field structure remains unchanged, the present invention can also be designed as a single-mold double-plate structure, and two bipolar plates can be punched out with a pair of dies, which can improve production efficiency.

[0075] Such as Figure 8 It is version 2 of one mold and two plates, the overall flow field of the bipolar plate and the arrangement of gas inlet and outlet remain unchanged, and the layout of the cooling water inlet channel is changed to achieve the effect of one mold and two plates.

[0076] Since the cooling water channel support and sealing groove structure in version 2 are in a symmetrical relationship, when the bipolar plates are rotated and spliced ​​by 180°, two sealant groove str...

Embodiment 2

[0080] Such as Figure 9 , adjust the positional relationship of the sealing rubber strip, and add a bolt hole at each of the four corners to ensure that the entire bipolar plate can be locked evenly after being pressed. The processing difficulty of the stamping die increases the strength of the whole support.

Embodiment 3

[0082] Such as Figure 10-11 , the present invention changes the pattern to the following way on the basis of replacing the second embodiment, moves the bolt holes to the outside of the pattern, maintains the strength of the overall structure of the pattern, and simultaneously designs four new ones on the upper and lower sides of the pattern The surrounding positioning groove structure is used for the surrounding positioning method of the metal bipolar plate during the assembly and stacking process. The surrounding positioning method can avoid the trouble of pulling out the positioning pin caused by positioning the positioning hole when the bipolar plate is stacked and pressed. The surrounding positioning grooves can also be used for fixing the bipolar plate on the fuel cell stack after assembly, so as to prevent the misalignment of the bipolar plate during the use of the fuel cell stack.

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Abstract

The invention provides a bipolar plate structure and a fuel cell. The bipolar plate structure comprises: a first side surface and a second side surface, wherein the first side surface is provided witha hydrogen flow channel, the second side surface is provided with an oxygen flow channel, the first side surface is provided with at least two hydrogen inlets and at least two hydrogen outlets, the at least two hydrogen inlets are respectively communicated with the hydrogen flow channel, the at least two hydrogen outlets are further respectively communicated with the hydrogen flow channel, at least two oxygen inlets and at least two oxygen outlets are formed in the second side surface, the at least two oxygen inlets are respectively communicated with the oxygen flow channel, and the at leasttwo oxygen outlets are respectively communicated with the oxygen flow channel. The bipolar plate structure is advantaged in that the number of flow channels communicated with each hydrogen inlet, eachhydrogen outlet, each oxygen inlet and each oxygen outlet can be ensured to be more uniform, therefore, the area of a reaction zone of the hydrogen-oxygen electrochemical reaction can be reasonably enlarged according to power requirements, and a problem of non-uniform gas distribution caused by a single inlet / outlet structure of three inlets and three outlets is solved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a bipolar plate structure and a fuel cell. Background technique [0002] Fuel cells are currently a hot new form of energy. The fuel cell system is mainly composed of stacks, control systems and auxiliary systems. The main components of the fuel cell stack (hereinafter referred to as the stack) are: end plate, bipolar plate (also known as separator), membrane electrode (including carbon paper diffusion layer, electrolyte membrane, catalytic layer), insulating plate, collector plate And so on. The bipolar plate is mainly responsible for the carrier of the reaction gas and the division of the reaction gas in the stack. The bipolar plate is composed of two unipolar plates. The front and back surfaces of the bipolar plate are the hydrogen side and the oxygen side reaction surface respectively. The gas flows into the surface of the reaction flow field through the inlet, and then...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0202H01M8/0258
CPCH01M8/0202H01M8/0258Y02E60/50
Inventor 张磊王思偲张永张威肖彪刘智亮
Owner GREE ELECTRIC APPLIANCES INC
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