A fuel cell metal bipolar plate and its welding method

A technology of metal bipolar plates and welding methods, which is applied to fuel cell parts, welding equipment, laser welding equipment, etc., can solve problems such as increased resistance and poor operating performance, and achieve reduced deformation, improved performance, and smoothness degree of effect

Active Publication Date: 2021-11-02
北京新研创能科技有限公司
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Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a fuel cell metal bipolar plate and its welding method, which solves the problem of wave-breaking warpage caused by cold shrinkage, flow channel uplift and skirt formation after welding the current fuel cell metal bipolar plate. Increased resistance and poor running performance due to deformation

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  • A fuel cell metal bipolar plate and its welding method

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Embodiment Construction

[0027] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention will be further described in detail below in conjunction with specific embodiments.

[0028] A method for welding a metal bipolar plate of a fuel cell provided by the present invention improves the flatness of the metal bipolar plate of a fuel cell, comprising the following steps:

[0029] 1. Place the two unipolar plates (anode plate and cathode plate) of the metal bipolar plate on the jig for positioning. The anode plate is on the upper layer and the cathode plate is on the lower layer. Keep the anode plate, cathode plate and welding tooling The relative position of the anode plate remains unchanged, and the compression tooling is placed to make the anode plate flow channel and the cathode plate flow channel closely fit.

[0030] Use the laser beam to carry out relative displacement along the welding track in the middle of the metal bipolar pl...

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Abstract

The invention discloses a fuel cell metal bipolar plate and a welding method thereof. The welding method comprises the following steps: positioning two unipolar plates in the metal bipolar plate, wherein the anode plate is on the upper layer, and the cathode plate is on the lower layer. And make the anode plate and the cathode plate flow channel fit closely; the laser beam follows the welding track in the middle of the metal bipolar plate flow channel, the outer ring of the metal bipolar plate, the second middle of the metal bipolar plate flow channel, and the outermost periphery of the metal bipolar plate Displacement is carried out, and the front and back of the metal bipolar plate are welded sequentially. Using the thermal deformation characteristics of the metal bipolar plate laser welding, the irregular deformation caused by the original welding method is corrected, and finally a higher warpage requirement is achieved. The warpage of the metal bipolar plate of the fuel cell is 1-2mm.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a metal bipolar plate of a fuel cell and a welding method for improving its flatness. Background technique [0002] At present, the metal bipolar plate is the most important component in the hydrogen-oxygen fuel cell stack. The metal bipolar plate is used to distribute reactants, conduct electricity, conduct heat, support membrane electrodes, and provide flow channels for removing the water generated by the reaction. Whether the warpage of the metal bipolar plate after laser welding can meet the requirements determines whether the contact pressure of the sealing ring and the membrane electrode is uniform after stacking, which in turn affects the working stability and power generation efficiency of the stack. [0003] Nowadays, the metal bipolar plates of fuel cells are mostly welded by laser welding machines along the welding path around the bipolar plates. This pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/24H01M8/0206
CPCB23K26/24H01M8/0206Y02E60/50
Inventor 刘峰王艳波徐泽峰孙彦云孙建晓许立阳
Owner 北京新研创能科技有限公司
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