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A laser welding method for the active region of a metal bipolar plate

A metal bipolar plate, laser welding technology, applied in laser welding equipment, welding equipment, metal processing equipment, etc.

Active Publication Date: 2020-07-07
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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  • A laser welding method for the active region of a metal bipolar plate
  • A laser welding method for the active region of a metal bipolar plate
  • A laser welding method for the active region of a 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 the active area of ​​a metal bipolar plate. After the metal bipolar plate is positioned, laser light from a laser light source welds the welding area of ​​the active area of ​​the bipolar plate. The bipolar plate is positioned by the bipolar plate laser positioning fixture. The bipolar plate and the positioning fixture are equipped with corresponding positioning points that can be fitted, and the positioning fixture is provided with welding holes for welding the bipolar plate; from the laser light source The laser welds the welding area of ​​the bipolar plate through the welding hole. The invention creatively uses welding technology to weld the active area of ​​the bipolar plate, and the bipolar plate in the active area is completely bonded after welding, without problems such as clamping deformation and stress deformation, and at the same time, the scrap rate is low, and the power generation efficiency of the hydrogen fuel cell is also improved. . Using the method of the invention, the active area is welded first, which is convenient for detecting whether there is dislocation and deformation of the bipolar plate, and then the sealing area is welded. The test shows that the welding yield of the bipolar plate can be increased by 15%, and the comprehensive 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 Patents(China)
IPC IPC(8): H01M2/26B23K26/21H01M50/531
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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