Stacked Battery Electrode Edge Layout for Firm Adhesive Bonding
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Solution Overview
Problem
In nonaqueous electrolyte batteries, the difference in area between positive and negative electrodes causes the outer edges to offset, making it difficult for adhesive members like tapes to be firmly adhered to the side surfaces of the stacked body.
Innovation Solution
A battery design where the outer edge of the larger second electrode is positioned within a specific distance range relative to the first electrode's adhesive member, allowing for proper alignment and firm adhesion of adhesive members to the side surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive members are provided on the side surface of the stacked body, then the battery can be protected and assembled, but the adhesive members cannot be firmly adhered when the outer edges of the positive and negative electrodes offset from each other
Solution Approach 1:
The patent introduces a new dimensional parameter - the distance relationship between the outer edge of the second electrode and the outer edge of the first electrode in the direction from the stacked body toward the adhesive member. By controlling this distance to be within a specific range (0% to 200% of the thickness of the second electrode), the patent ensures that the adhesive member can be firmly adhered to the side surface even when the electrodes have different areas and their outer edges offset from each other.
2Adaptability or versatility
If the area of positive electrode and negative electrode are made different, then the battery can be optimized for performance, but the outer edges offset making adhesive application difficult
Solution Approach 1:
The patent changes the critical parameter from edge alignment to distance control. Instead of requiring the outer edges of the positive and negative electrodes to align (which would restrict electrode area flexibility), the patent specifies that the distance between the outer edge of the second electrode and the outer edge of the first electrode should be within 0% to 200% of the thickness of the second electrode. This parameter change allows different electrode areas while ensuring proper adhesive application.
Data Source
AI summary
An outer edge of a negative electrode (200) covered with a first adhesive member (410) is substantially aligned with an outer edge of a positive electrode (100) covered with the first adhesive member (410) in a direction from a stacked body (10) toward the first adhesive member (410) or a direction from the first adhesive member (410) toward the stacked body (10). Specifically, the outer edge of the negative electrode (200) covered with the first adhesive member (410) is positioned within a distance equal to or more than 0% and equal to or less than 200% of a thickness of the negative electrode (200) from the outer edge of the positive electrode (100) covered with the first adhesive member (410) in the above direction.