Electrode Current Collection Foil Layout for Terminal Overlap
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Solution Overview
Problem
Existing battery technologies face challenges in properly superimposing multiple terminal sections of electrodes within a wound charge/discharge body, leading to potential misalignment and performance issues.
Innovation Solution
A current collection foil with terminal sections that have varying intervals and distinct markings to facilitate proper alignment during the winding process, ensuring accurate overlap and positioning of terminal sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If terminal sections are formed with uniform intervals, then the structure is simple and easy to manufacture, but the terminal sections cannot be properly superimposed in the wound charge/discharge body
Solution Approach 1:
The patent applies asymmetry by configuring terminal sections with non-uniform intervals along the current collection foil. Specifically, the interval between terminal sections is made longer on the winding end side compared to the winding start side, creating an asymmetric distribution that enables proper superimposition when the foil is wound into a cylindrical shape, while maintaining relative simplicity in the manufacturing process.
2Reliability
If terminal sections are properly superimposed, then battery performance is enhanced, but additional marks and non-uniform intervals increase manufacturing complexity
Solution Approach 1:
The patent applies preliminary action by pre-configuring the terminal sections with non-uniform intervals and adding distinctive marks to specific terminal sections before the winding process. This advance preparation ensures that when the current collection foil is wound, the terminal sections automatically superimpose correctly at the intended positions, thereby enhancing battery performance while the added complexity is limited to the initial configuration stage.
3Measurement precision
If marks are added to terminal sections, then alignment recognition is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies the color changes principle by using visual marks (such as color differences or pattern variations) on specific terminal sections to enable easy recognition and alignment during the winding process. These marks provide clear visual cues for positioning without requiring complex marking systems or additional sophisticated equipment, thus improving alignment recognition while minimizing manufacturing complexity.
Data Source
AI summary
A current collection foil (for example, a positive electrode current collection layer) of an electrode includes a current collection section joined with an active material and wound and a plurality of terminal sections provided at a side edge extending in a winding direction of the current collection section. The terminal sections adjacent to one another in the winding direction include the terminal sections formed with relatively longer intervals on a side close to another end portion at a winding end than a side close to one end portion at a winding start of the current collection section. The plurality of terminal sections overlap in a state in which the current collection section is wound. At least one of the terminal sections and the current collection section 11a includes a mark for distinguishing any one terminal section of the current collection section and the other terminal sections.