Secondary Battery Case Sealing Structure for Stable Welded Joints
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Solution Overview
Problem
The existing secondary battery technology faces instability in the joining portion between the case main body and the sealing plate, leading to unreliable sealing and potential leakage issues.
Innovation Solution
The solution involves a secondary battery design with a case main body having specific end surfaces and outer peripheral surfaces, where sealing plates with covering portions are positioned to form welded joining portions, ensuring stable abutment and secure sealing through multiple applications of energy rays for welding, while also incorporating spacers for enhanced stability and efficient manufacturing processes.
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:
The patent introduces an intermediary positioning structure consisting of positioning protrusions on the sealing plate that fit into positioning grooves on the case main body. This intermediary mechanism ensures stable positioning of the sealing plate relative to the case main body before joining, thereby improving both positioning stability and joining reliability without requiring complex adjustment mechanisms
Solution Approach 2:
The patent implements preliminary positioning action by providing predetermined positioning protrusions and grooves that guide and secure the sealing plate in the correct position before the joining process begins. This preliminary positioning ensures that the sealing plate and case main body are properly aligned, preventing positioning instability during the joining operation and improving overall joining reliability
2Reliability
If multiple energy rays are applied for welding the joining portions, then the sealing reliability is improved, but the thermal influence on insulating members increases
Solution Approach 1:
The patent applies local quality by concentrating the welding energy rays precisely at the joining portions between the sealing plate and case main body, rather than applying heat broadly. The positioning protrusions and grooves ensure that energy rays are localized to specific joining points, achieving reliable sealing while minimizing thermal influence on surrounding insulating members through targeted, localized welding
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, improves the sealing process, and reduces thermal influence on the insulating members, resulting in a more stable and efficient secondary battery with improved output characteristics and manufacturing efficiency.
Implementation Method 1
performing a joining process from an outer peripheral side around an axis in a first direction so as to form a joining portion that bridges the sealing plate and the outer peripheral surface portion
Data Source
Figure 1
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Figure 3~4
AI summary
A first end surface (117) is located at an end portion of a case main body (110) on a first side and extends in a direction intersecting a first direction. A second end surface (118) is located at an end portion of the case main body (110) on a second side and extends in the direction intersecting the first direction. A first sealing plate (120) has a first covering portion (127). The first covering portion (127) covers at least a portion of the first end surface (117) in the first direction. A second sealing plate (130) has a second covering portion (137). The second covering portion (137) covers at least a portion of the second end surface (118) in the first direction. A first joining portion (140) is formed to bridge an outer peripheral surface portion (116) and the first covering portion (127). A second joining portion (141) is formed to bridge the outer peripheral surface portion (116) and the second covering portion (137).