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Forming method for high-precision metal bipolar plate required by fuel cell

A metal bipolar plate and fuel cell technology, applied to fuel cell parts, forming tools, metal processing equipment, etc., can solve the problems of increased manufacturing costs, increased scrap rate, uneven bipolar plate surface, etc., to achieve Reduce molding warpage and stress deformation, reduce production scrap rate, and optimize the effect of molding process

Active Publication Date: 2019-12-03
上海佑戈金属科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the metal bipolar plate obtained by stamping has obvious warpage and deformation, which causes a large internal stress after the bipolar plate is welded and cannot be released, resulting in the uneven surface of the manufactured bipolar plate, which leads to the irregular shape of the entire fuel cell reactor. It is not easy to install, and the power generation efficiency is affected
However, the stretching depth of the bipolar plate groove generally does not meet the design requirements, and the height error of adjacent flow channels is too large, which reduces the power generation capacity of the bipolar plate
The bipolar plate scrap rate is high during the production process, which greatly increases the manufacturing cost
When welding the bipolar plates together, frequent missing welds further increase the scrap rate

Method used

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  • Forming method for high-precision metal bipolar plate required by fuel cell
  • Forming method for high-precision metal bipolar plate required by fuel cell
  • Forming method for high-precision metal bipolar plate required by fuel cell

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Embodiment

[0059] This embodiment provides a two-step stamping method for preparing a high-precision metal bipolar plate required for a fuel cell. The specific steps are as follows:

[0060] S1, select the raw material of the bipolar plate;

[0061] The selection of raw material plates is the key to manufacturing high-precision metal-based fuel cell bipolar plates. To manufacture high-performance metal-based fuel cell bipolar plates, the molding performance of raw materials must be considered. , Structural ribs and a series of structures, to form such a metal plate, it is necessary to choose moderate hardness, high elongation, and high tensile strength to prevent the plate from cracking. At the same time, as the fuel cell gas flow channel and reaction vessel, the plate material should also have good corrosion resistance, and it can continuously and stably collect current without being oxidized and corroded. The present invention selects an austenitic stainless steel SUS316L with strong ...

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Abstract

The invention provides a forming method for a high-precision metal bipolar plate required by a fuel cell. The method specifically comprises the following steps of: selecting a bipolar plate raw material, designing and manufacturing a die 1 for bipolar plate punch forming and a die 2 for bipolar plate punch forming, carrying out pre-punch forming, performing complete punch forming, performing stamping and cutting, and performing welding to obtain the bipolar plate. The punch quality of the bipolar plate is improved through the first-step pre-forming and the second-step complete forming, the phenomena of buckling deformation, overlarge stress, insufficient groove depth, overlarge height difference between adjacent runners, high rejection rate, solder skips and the like in the forming processof the metal bipolar plate are avoided, and the fuel cell metal bipolar plate can be formed efficiently with high precision and low cost.

Description

technical field [0001] The invention relates to the field of hydrogen energy fuel cells, in particular to a method for forming high-precision metal bipolar plates required by fuel cells. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy in fuel and oxidant into electrical energy through an electrocatalytic reaction on a motor. The fuel cell is mainly composed of a membrane electrode (MEA) and a bipolar plate; the MEA is the core of the fuel cell, and the bipolar plate is an important part of the battery, which plays a role in collecting current, gas distribution, water management, and heat management in the fuel cell. Function; there are many types of bipolar plates, and the bipolar plates usually used are mechanically processed graphite bipolar plates. The technology is relatively mature, but the processing cost is high, and it is mainly used in laboratory experimental research; current research on fuel cell bi...

Claims

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Application Information

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IPC IPC(8): H01M8/0206B21D22/02B21D37/20
CPCB21D22/02B21D37/20H01M8/0206Y02E60/50Y02P70/50
Inventor 马腾
Owner 上海佑戈金属科技有限公司
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