Laser processing system for processing flow channel of graphite composite base material bipolar plate

Abstract

The invention discloses a laser processing system for processing a graphite composite base material bipolar plate runner, which is characterized in that a controller in the system sends a to-be-processed runner morphology size characteristic with a three-dimensional morphology structure in a to-be-processed runner to a picosecond laser, and sends to-be-processed information comprising at least one group of scanning information to a galvanometer; the picosecond laser emits laser according to the morphology and size characteristics of a to-be-processed runner to the galvanometer through the beam expander; for each group of scanning information, the galvanometer controls the received laser to pass through a focusing light spot formed by a focusing field lens according to the scanning path information to scan the graphite composite material base material to obtain an initial flow channel, and the initial flow channel is scanned according to the three-dimensional shape scanning information to obtain a flow channel with a three-dimensional shape structure; and after each group of scanning information is scanned, a scanned runner is obtained, and when the difference between the morphology and size characteristics of the scanned runner and the morphology and size characteristics of the runner to be machined is within an error range, the scanned runner is used as a final runner. Therefore, the fuel cell performance is improved.

Description

technical field [0001] The invention relates to the technical field of bipolar plates, in particular to a laser processing system for processing bipolar plate flow channels of graphite composite substrates. Background technique [0002] Bipolar plates are one of the core components of fuel cells. Graphite composite materials are ideal materials for fuel cell bipolar plates. The flow channel design of graphite composite bipolar plates is a key factor in determining the performance of fuel cells. [0003] At present, the flow channel processing method of graphite composite bipolar plate is usually based on mold hot pressing such as figure 1 As shown, after feeding, molding and demoulding, the processed bipolar plate is finally obtained. Since mold hot pressing is limited by the influence of mold design, molding process and demoulding process, only relatively simple runner shapes can be processed, such as figure 1 The cross-section of the straight channel is rectangular, and ...

AI Technical Summary

Problems solved by technology

Since mold hot pressing is limited by the influence of mold design, molding process and demoulding process, only relatively simple runner shapes can be processed, such as figure 1 The cross-section of the flow channel is rectangular, and it is difficult to process complex flow channel shapes.

[0004] In the prior art, the heat and mass transfer performance of the bipolar plate is optimized by simply adjusting the shape parameters of the flow channel, such as the width, depth and spacing of the straight channel. However, this simple adjustment cannot achieve good results, which limits the Improved battery performance

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