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Large-area metal bipolar plate for automobile fuel cell

A large-area metal and fuel cell technology, applied to battery electrodes, circuits, electrical components, etc., can solve problems such as difficult application and large flow resistance of bipolar plates, achieve low manufacturing costs, increase energy density, and reduce mold design The effect of processing costs

Active Publication Date: 2013-03-13
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure requires three thin metal plates of different configurations to meet the functional requirements. At the same time, the bipolar plate has a large flow resistance, which makes it difficult to apply to large-area metal plates of automotive fuel cells.

Method used

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  • Large-area metal bipolar plate for automobile fuel cell
  • Large-area metal bipolar plate for automobile fuel cell
  • Large-area metal bipolar plate for automobile fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment is implemented under the following conditions of implementation and technical requirements:

[0028] according to Figure 1~4 The schematic diagram of the structure of the large-area metal bipolar plate of the vehicle fuel cell shown is to design and process the stamping die, including the upper die and the lower die. Prepared by precision stamping forming process with such figure 1 For the unipolar plate with the flow field configuration shown, the punching force is 200 tons, and the punching speed is 30 seconds / sheet. The plate material is stainless steel 316, the material thickness is 0.1mm, and the overall size of the unipolar plate after trimming is 100×400mm. Such as Figure 5 As shown, the depth h of the runner groove 15 is 0.5 mm, the width w of the runner groove 15 is 1.2 mm, and the width of the ridge 14 is n1.0 mm. After two identical unipolar plates are combined, one side forms the fuel flow channel a, and the other side The oxidant flow ...

Embodiment 2

[0033] In this embodiment, the soft film forming process is used to prepare such as Figure 1~4 Large-area metal bipolar plates for automotive fuel cells are shown. The upper mold is processed according to the flow field configuration, and the polyurethane material with a hardness of 55° is used as the soft film, and the 0.2mm thick stainless steel 304 sheet material is placed between the upper mold and the soft film. The forming force is 300 tons, and the forming speed is 60 seconds / piece. The overall size of the monopolar plate after forming and trimming is 100×400mm. Such as Figure 5 As shown, the runner groove 15 is 0.4mm deep, the runner groove 15 is 1.5mm wide, and the ridge 14 is 1.2mm wide. The number of flow channels in the unipolar plate DC field area 6 is 27, and the number of flow channels in the flow field distribution area 3 and the flow field assembly area 10 is 9. The sealing groove 5 is 3.0mm wide and 0.4mm deep. Two identical unipolar plates are connect...

Embodiment 3

[0036] In this embodiment, the hydroforming process is used to prepare such as Figure 1~4 Large-area metal bipolar plates for automotive fuel cells are shown. The unilateral mold is processed according to the flow field configuration, and the hydraulic oil with a viscosity coefficient of 55 is used as the forming medium. One side of the 0.1mm thick stainless steel 304 sheet material is in contact with the unilateral mold and sealed, and the other side is in contact with the hydraulic oil. Through the hydraulic cylinder Adjust the forming force. In this embodiment, the forming hydraulic pressure is 350 MPa, and the forming speed is 120 seconds / piece. The overall size of the monopolar plate after forming and trimming is 100×400mm. Such as Figure 5 As shown, the runner groove 15 is 0.6 mm deep, the runner groove 15 is 0.8 mm wide, and the ridge 14 is 0.5 mm wide. The number of flow channels in the unipolar plate DC field area 6 is 75, and the number of flow channels in the ...

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Abstract

The invention relates to a large-area metal bipolar plate for an automobile fuel cell. The bipolar plate is formed by connecting two pieces of single-pole plates which are completely the same as each other; the two single-pole plates are respectively provided with a fuel inlet / outlet, an oxidant inlet / outlet, a cooling liquid inlet / outlet and a flow field; the flow field arranged on the single-pole plate on one side is connected with the fuel inlet / outlet so as to be taken as a fuel flow field, and the flow field arranged on the single-pole plate on the other side is connected with the oxidant inlet / outlet so as to be taken as an oxidant flow field; a cooling liquid flow field connected with the cooling liquid inlet / outlet is formed by an interlayer between the two single-pole plates which are clamped together; and therefore, a three-inlet and three-outlet structure can be formed, and the function of two plates with three fields can be realized. Compared with the prior art, the large-area metal bipolar plate can be prepared only by a mould, so that the mould development expenses and the forming technology complexity are reduced; due to the structure of the two single-pole plates, the area of flow field region is large, reaction efficiency is high and the demands of high power and high energy rate density of the automobile fuel cell are met; and the large-area metal bipolar plate is suitable for large-scale manufacturing methods such as stamping forming, soft film forming and hydro-bulging, thus being low in manufacturing cost.

Description

technical field [0001] The invention relates to a manufacturing method in the technical field of fuel cells, in particular to a large-area metal bipolar plate configuration of a proton exchange membrane fuel cell for vehicles and a manufacturing method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a "chemical energy power generation" device that directly converts chemical energy in raw materials into electrical energy. Its energy conversion efficiency is not limited by the Carnot cycle, and the power generation efficiency of the battery pack can reach more than 50%. . At the same time, PEMFC is environmentally friendly, has excellent start-up characteristics, high energy conversion efficiency, stable operation, and no noise. It is expected to be applied in many fields, especially in automotive power systems. The practical application of PEMFC electric vehicles can solve the problems of environmental pollution and energy shortage caused...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86
CPCY02E60/50
Inventor 易培云彭林法徐竹田来新民
Owner SHANGHAI JIAO TONG UNIV
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