Flat Battery Base Flange Mechanical Fixation
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Solution Overview
Problem
Conventional flat batteries face challenges in ensuring sufficient weld strength between the base and the exterior can, making it difficult to determine if the weld is adequate without destructive inspection, and the base movement is not effectively restrained.
Innovation Solution
A flat battery design where a base with a flange is used to fix one of the electrode materials to the exterior can without welding, with the flange overlapping the open end of the sealing can's circumferential wall and positioned between the sealing can and the exterior can's inner surface, ensuring secure fixation and movement restraint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the base is welded to the exterior can, then the base can be fixed to the exterior can, but it is difficult to determine whether the weld strength is sufficient and the operation of welding is necessary in assembling
Solution Approach 1:
The patent replaces the welding process with a mechanical interference fit system. The base includes a flange that fits into a groove formed on the inner surface of the exterior can's bottom, eliminating the need for welding operations while providing secure fixation through mechanical interlocking.
Solution Approach 2:
The groove formed on the inner surface of the exterior can's bottom acts as an intermediary structure that enables the base to be securely fixed without welding. This intermediate feature facilitates the mechanical connection between the base and exterior can.
2Reliability
If the base is welded to the exterior can, then the base can be fixed to the exterior can, but non-destructive inspection cannot determine sufficient weld strength
Solution Approach 1:
The patent replaces welding with a mechanical interference fit system where the base flange fits into a groove on the exterior can's bottom. This mechanical connection can be visually inspected and verified without destructive testing, eliminating the inspection difficulty associated with weld strength assessment.
3Stability of the object's composition
If a base holds the positive electrode material, then the positive electrode material can be fixed, but the base movement with respect to the exterior can is not effectively restrained
Solution Approach 1:
The patent uses a mechanical interference fit system where the base flange fits into a groove on the exterior can's bottom. This design simultaneously restrains base movement relative to the exterior can and secures the positive electrode material, resolving both fixation requirements through a single mechanical structure.
Data Source
Figure 1
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AI summary
A flat battery having a base provided on an inner surface of a bottom of an exterior can and used to hold one of a positive electrode material and a negative electrode material that can be readily produced and can surely restrain the movement of the base with respect to the exterior can is provided. A flat battery (1) includes a positive electrode can (10), a negative electrode can (20), a positive electrode material (41), a negative electrode material (42), and a positive electrode ring (44) provided on an inner surface of a bottom (11) of the positive electrode can (10) to hold one of the positive electrode material (41) and the negative electrode material (42). The positive electrode ring (44) has a side wall (44a) and a flange (44b) that extends outward to overlap an open end of a circumferential wall (22) of the negative electrode can (20). The flange (44b) is placed between the open end of the circumferential wall (22) of the negative electrode can (20) and the inner surface of the bottom (11) of the positive electrode can (10).