Battery Terminal Weld Structure for Gas-Evacuation Void Reduction
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Solution Overview
Problem
The existing power storage devices face issues with void generation and reduced conductivity due to gas trapped in the welded portions of the current collecting member and terminal member during the laser welding process, leading to decreased strength and increased connection resistance.
Innovation Solution
Incorporating a first space adjacent to the welded portion and extending along the hole circumferential surface, which allows for the evacuation of generated gas during welding, and optionally a second space that communicates with the first space to further reduce voids, enhancing the strength and conductivity of the welded connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If laser welding is performed on the hole circumferential portion and swaged portion without additional space configuration, then the welding process is simple, but gas generated from oil vaporization becomes trapped in the welded portion causing voids that reduce strength and conductivity
Solution Approach 1:
The patent introduces a first space that extends in the circumferential direction along the hole circumferential surface, adding a spatial dimension for gas evacuation. This circumferential extension provides a pathway for gas to escape from the welded portion without requiring complex multi-dimensional structures, effectively reducing voids while maintaining relatively simple overall device architecture.
Solution Approach 2:
The first space acts as an intermediary region between the welded portion and the external environment. It serves as a buffer zone that captures and evacuates gas generated during welding, preventing direct trapping of gas in the welded portion. This intermediary space mediates the conflict between maintaining simple welding procedures and achieving high-quality welded joints free of voids.
2Reliability
If laser welding is performed on the hole circumferential portion and swaged portion, then the connection is formed, but gas from oil vaporization remains inside the welded portion causing voids that increase connection resistance
Solution Approach 1:
The first space is configured in advance before the laser welding process occurs. This pre-established space provides a predetermined pathway for gas evacuation during welding, ensuring that gas generated from oil vaporization can escape before causing voids in the welded portion. The preliminary configuration of this escape route maintains manufacturing simplicity while improving welding quality and conductivity.
3Reliability
If the welded portion is formed without gas evacuation space, then the manufacturing process is straightforward, but voids form in the welded portion reducing electrical conductivity
Solution Approach 1:
The first space extends in the circumferential direction, utilizing the circumferential dimension along the hole surface to create an effective gas evacuation pathway. This circumferential extension allows gas to escape laterally from the welded portion without requiring complex three-dimensional structures, thereby improving welded portion quality and reducing connection resistance while maintaining manufacturing precision.
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 configuration significantly reduces voids in the welded portions, thereby improving the strength and conductivity of the connections between the current collecting member and terminal member, leading to lower connection resistance.
Implementation Method 1
a laser welding process is performed for the lid structure to laser-weld a to-be-welded portion of the hole circumferential portion of the current collecting member and a to-be-welded portion of the swaged and deformed portion of the terminal member
Implementation Method 2
laser-welding the hole circumferential portion of the current collecting member and the swaged and deformed portion of the terminal member in the laser welding process causes vaporization of the oil due to a welding heat, which results in generation of gas in a molten portion
Data Source
AI summary
A power storage device includes a welded portion in which a hole circumferential portion of a current collecting member and a swaged and deformed portion of a terminal member are welded, and a first space, which is surrounded by the welded portion, a hole circumferential surface of the hole circumferential portion, and the swaged and deformed portion, is placed adjacent to the welded portion to extend in a circumferential direction along the hole circumferential surface.