Laser Welding Jig Gas Flow Layout for Uniform Shielding
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Solution Overview
Problem
Existing welding jigs for secondary batteries suffer from non-uniform gas injection, leading to oxidation reactions and spatter during laser welding, resulting in low weld quality.
Innovation Solution
A welding jig design featuring an outer and inner jig structure with opposing gas flow directions and increasing passage intervals, ensuring uniform gas distribution and preventing oxidation reactions and spatter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inert gas is sprayed to the welding target to prevent oxidation reaction and spatter, then weld quality is improved, but gas injection becomes non-uniform leading to inconsistent protection
Solution Approach 1:
The gas injection system is segmented into multiple injection holes (first injection holes and second injection holes) arranged in different directions. This segmentation allows gas to be injected from multiple directions simultaneously, creating more uniform gas distribution across the welding target surface and improving the consistency of oxidation protection.
Solution Approach 2:
Different regions of the welding jig are equipped with injection holes oriented in different directions. The first injection holes are directed toward a first direction while second injection holes are directed toward a second direction different from the first. This local quality variation ensures that each region receives appropriate gas flow direction, achieving uniform overall coverage.
2Device complexity
If a simple gas injection structure is used, then device complexity is reduced, but gas distribution uniformity deteriorates
Solution Approach 1:
Instead of a single complex injection channel, the system uses multiple simple injection holes segmented across different surfaces of the welding jig. Each hole is straightforward in structure but collectively they achieve complex gas distribution patterns through multi-directional arrangement.
Solution Approach 2:
The gas injection system transitions from single-direction linear injection to multi-directional three-dimensional injection. By adding injection holes in different spatial directions (first direction and second direction), the system achieves uniform gas distribution without requiring complex internal passage structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves uniform gas injection, improving weld quality by preventing non-uniform welding and spatter formation.
Implementation Method 1
the welding apparatus may carry out welding by emitting a laser to locally heat and thermally melt the welding target P
Implementation Method 2
locally heat and thermally melt the welding target P
Implementation Method 3
feeds inert gas, for example, nitrogen gas to the welding target P to suppress oxidation reaction by air
Data Source
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AI summary
In a jig configured to feed gas to a laser welding target and discharge the gas, the welding jig according to a first embodiment of the present disclosure may include an outer jig into which the gas is fed and an inner jig that is inserted into the outer jig along an insertion direction to form a gap with the outer jig, and configured to receive the gas fed into the outer jig through the gap and discharge the gas. The outer jig may include an outer body into which the inner jig is inserted, and forming the gap with the inner jig, and a pair of feed units located at two sides of the outer body, and configured to feed the gas to the outer body, a feed passage along which the fed gas flows may be formed in the pair of feed units, a communication passage may be formed in the outer body and the pair of feed units to bring the feed passage and the gap into communication with each other, and directions of the gas flow in the pair of feed passages may be opposite to each other.