Secondary Battery End-Sealing Structure for Precise Laser-Welded Joining
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Solution Overview
Problem
The existing secondary battery technology faces reliability issues with the joining portion between the case main body and the sealing plate, leading to unstable sealing and potential leakage.
Innovation Solution
The proposed solution involves a secondary battery design with a case main body having specific end surfaces and openings, where sealing plates with covering portions are positioned to form joining portions through laser welding, ensuring stable abutment and secure sealing by bridging the outer peripheral surface and covering portions, and utilizing spacers for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing plate is positioned with respect to the case main body, then the joining portion can be formed, but the positioning is unstable and the joining reliability is insufficient
Solution Approach 1:
A positioning protrusion is provided on the sealing plate that fits into a positioning groove on the case main body. This intermediary mechanical feature acts as a mediator to achieve stable positioning between the sealing plate and case main body, resolving the positioning instability issue while maintaining joining reliability.
Solution Approach 2:
The positioning protrusion on the sealing plate is nested into the positioning groove on the case main body, creating a fit-and-lock mechanism. This nesting structure ensures precise positioning and stable joining without requiring additional positioning systems, thereby improving both positioning precision and joining reliability.
2Reliability
If laser welding is used to form the joining portion, then the sealing integrity is improved, but thermal influence during manufacturing increases
Solution Approach 1:
The laser welding process is applied locally only at the joining portion between the sealing plate and case main body, rather than heating the entire assembly. This localized approach maintains high sealing integrity at the critical joining area while minimizing thermal influence on the electrode assembly and other temperature-sensitive components.
Solution Approach 2:
The case main body and sealing plate are pre-positioned using the positioning protrusion and groove mechanism before laser welding is applied. This preliminary positioning ensures that the welding heat is concentrated exactly where needed for sealing integrity, preventing thermal spread to other components and reducing overall thermal influence during manufacturing.
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
This design enhances the reliability of the joining portion, improving the sealing integrity and reducing thermal influences during the manufacturing process, resulting in a more stable and efficient secondary battery assembly.
Implementation Method 1
joining portions that join the case main body and the sealing plates to each other
Data Source
AI summary
A first end surface is located at an end portion of a case main body on a first side and extends in a direction intersecting a first direction. A second end surface is located at an end portion of the case main body on a second side and extends in the direction intersecting the first direction. A first sealing plate has a first covering portion. The first covering portion covers at least a portion of the first end surface in the first direction. A second sealing plate has a second covering portion. The second covering portion covers at least a portion of the second end surface in the first direction. A first joining portion is formed to bridge an outer peripheral surface portion and the first covering portion. A second joining portion is formed to bridge the outer peripheral surface portion and the second covering portion.