Battery Case Welding Fixture With Vacuum Hold-Down for Cover Plates
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Solution Overview
Problem
Conventional welding methods for battery cases often result in damage to the covering member, such as a water cooling plate, due to uneven surface structures and excessive pressure, leading to high production scrap rates and costs.
Innovation Solution
A welding fixture equipped with a negative pressure suction mechanism, which includes first and second negative pressure suction units, is used to uniformly attach the covering member to the frame, reducing the risk of damage and displacement during welding. Additionally, a heating mechanism is employed to expand the covering member, allowing for improved flatness post-welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressing plate is used to press the covering member against the frame, then the covering member can be fixed for welding, but the uneven surface structure of the covering member is crushed causing damage
Solution Approach 1:
The patent replaces the conventional mechanical pressing plate system with a negative pressure suction system. Instead of applying concentrated mechanical pressure through a pressing plate, the system uses vacuum suction forces to hold the covering member against the frame, eliminating the crushing effect on the uneven surface structure while maintaining reliable fixation for welding
Solution Approach 2:
The patent employs pneumatic principles by using a negative pressure suction mechanism (vacuum system) to attach the covering member to the frame. The suction cups create a pressure difference that holds the covering member in place without mechanical contact and concentration of force, thereby preventing surface damage while ensuring fixing reliability
2Productivity
If conventional pressing method is used to fix the covering member, then welding can be performed, but the production scrap rate increases due to damage
Solution Approach 1:
By replacing the damaging mechanical pressing system with a negative pressure suction system, the patent enables continuous welding operations without the high scrap rate associated with conventional methods. The suction-based fixation preserves the covering member integrity while maintaining welding productivity
Solution Approach 2:
The patent changes the physical parameter of pressure application from concentrated positive pressure (pressing plate) to distributed negative pressure (suction). This parameter change eliminates surface crushing while maintaining adequate fixation, thereby reducing production scrap and improving overall productivity
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 proposed solution effectively reduces the risk of damage to the covering member, increases production yield, and decreases production costs by ensuring uniform pressure and utilizing thermal expansion for improved flatness.
Implementation Method 1
the negative pressure suction mechanism is arranged in the placement region and configured to generate negative pressure to suck the covering member so as to press the covering member against the frame
Implementation Method 2
a heating mechanism is employed to expand the covering member, allowing for improved flatness post-welding
Data Source
AI summary
A welding fixture and a welding device, which fall within the technical field of battery production are disclosed. The welding fixture comprises a base, a frame positioning mechanism and a negative pressure suction mechanism, the base comprising a placement region in which a frame is placed, the frame positioning mechanism being arranged on the base and configured to position the frame, and the negative pressure suction mechanism being arranged in the placement region and configured to generate negative pressure to suck a covering member so as to press the covering member against the frame. The welding fixture according to the present application can reduce the risk of damage to the covering member, increase the yield of cases, and reduce the production cost.