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Laser welding method for active region of metal bipolar plate

A metal bipolar plate, laser welding technology, used in laser welding equipment, welding equipment, metal processing equipment and other directions, to achieve the effect of improving efficiency, low scrap rate, and accurate positioning

Active Publication Date: 2018-06-05
湖南振邦氢能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above problems, the object of the present invention is to provide a laser welding method for the active region of a metal bipolar plate, which has precise welding positioning and no clamping deformation, stress deformation, etc.

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  • Laser welding method for active region of metal bipolar plate
  • Laser welding method for active region of metal bipolar plate

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Embodiment 1

[0039] This embodiment provides a laser welding method for the active region of the metal bipolar plate.

[0040] The method adopts the bipolar plate laser positioning fixture to position the bipolar plate, wherein the bipolar plate and the positioning fixture are provided with corresponding embedable positioning points, and the positioning points on the bipolar plate are set at Outside the active area of ​​the bipolar plate, the positioning fixture is provided with a welding hole for welding the bipolar plate; the laser from the laser light source welds the welding area of ​​the bipolar plate through the welding hole, and the emission power of the laser light source is 90~ 105w, the laser moves at a speed of 80-120mm / s relative to the bipolar plate to be welded and its fixture.

[0041] As an embodiment, preferably, the laser light source moves along a predetermined route for welding. see Figure 5 , is the welding circuit diagram of the welding method of the present inventi...

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Abstract

The invention relates to a laser welding method for an active region of a metal bipolar plate. After the metal bipolar plate is positioned, a welding region of the active region of the bipolar plate is welded by laser from a laser source. The bipolar plate is positioned by a bipolar plate laser positioning clamp, corresponding embedded positioning points are arranged on the bipolar plate and the positioning clamp, and welding holes for welding the bipolar plate are formed in the positioning clamp; the welding region of the bipolar plate is welded by the laser from the laser source through thewelding holes. The active region of the bipolar plate is creatively welded by adopting a welding technology, and the bipolar plate in the active region fully fits, and has no clamping deformation andstress deformation and other problems after welding; meanwhile, the waste product rate is low, and the power generation efficiency of a hydrogen fuel cell is also improved. By using the method provided by the invention, the active region is firstly welded, which is convenient to detect whether the bipolar plate is dislocated and deformed, and then a sealing region is welded. The test shows that the welding yield rate of the bipolar plate can be increased by 15% and the overall performance of the bipolar plate can be increased by 20%.

Description

technical field [0001] The invention relates to the field of new energy batteries, and more specifically, to a laser welding method for active regions of metal bipolar plates. Background technique [0002] The bipolar plate is an important part of the hydrogen fuel cell, which plays the role of current collection, gas distribution, water management and thermal management. The manufacturing process of the bipolar plate is generally to first make the anode and cathode flow field plates with thin metal plates (thickness 0.1mm), and then connect the two together to form a coolant flow channel between the two plates. The sealing requirements of the bipolar plate are very high. If the sealing is not good, the reaction substances and cooling liquid may leak, which will reduce the performance of the battery or lose its function. At present, the processing method of connecting anode and cathode adopts welding method. Compared with other connection processes, laser welding has the ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21H01M50/531
CPCB23K26/21
Inventor 黄思宏万春华彭金林
Owner 湖南振邦氢能科技有限公司
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