Stacked Battery Vibration Protection via Interlocking Electrodes
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Solution Overview
Problem
Stacked lithium ion batteries sealed by a film casing face issues with electrolyte leakage and moisture intrusion due to scratches or cracks caused by repeated vibrations, which existing methods fail to adequately address.
Innovation Solution
The battery design incorporates recessed and projecting sections on the electrodes, with holding members securely engaged with the film casing to prevent the stacked body from colliding with the casing, using a combination of recessed sections and projecting sections on the electrodes and holding members that are rigidly secured to the film casing, either directly or through separators, to maintain positional integrity and prevent damage from vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a film casing is used to seal the stacked battery, then weight efficiency and volume efficiency are improved, but the film casing is damaged by repeated vibrations causing electrolyte leakage and moisture intrusion
Solution Approach 1:
The patent applies beforehand cushioning by providing a cushioning member between the stacked body and the film casing. This cushioning member absorbs and mitigates the impact of repeated vibrations before they can damage the film casing, preventing holes and fissures from forming. The cushioning member is positioned in advance to protect vulnerable areas of the film casing from vibration-induced damage.
2Ease of manufacture
If the stacked body is allowed to move freely in the film casing, then ease of assembly is improved, but repeated rubbing against the film casing causes holes and fissures leading to liquid leakage
Solution Approach 1:
The patent applies segmentation by dividing the protection system into multiple functional components: the stacked body, the film casing, and the cushioning member. The cushioning member is segmented and positioned at specific locations where the stacked body contacts the film casing during vibration. This segmentation allows each component to perform its specific function while working together to prevent liquid leakage.
Solution Approach 2:
The cushioning member serves as an intermediary between the stacked body and the film casing. It mediates the interaction between these two components during vibration, preventing direct contact and rubbing that would otherwise cause holes and fissures in the film casing. The intermediary cushioning member absorbs the mechanical stress and protects the film casing from damage.
3Stability of the object's composition
If aligning sections are provided on electrodes, then positional integrity is maintained, but the problem of repeated contacts with film casing during vibration cannot be solved
Solution Approach 1:
The patent merges multiple functions into the cushioning member: it provides positional alignment similar to aligning sections while simultaneously offering vibration protection. The cushioning member is positioned at the corners and sides of the stacked body, combining the alignment function with the protective cushioning function, thereby solving both positional integrity and vibration protection requirements.
Data Source
AI summary
A stacked battery sealed by a film casing shows a raised degree of resistance against vibrations. The stacked battery includes a stacked body formed by alternately laying plate-like positive electrodes and plate-like negative electrodes one on the other by way of separators, each of the positive electrodes and the negative electrodes having recessed sections and corresponding projecting sections, the recessed sections of each electrode being disposed vis-a-vis the projecting sections of one of the adjacent electrodes of the opposite polarity and the projecting sections of each electrode being disposed vis-a-vis the recessed sections of the other adjacent electrode of the opposite polarity except the those arranged closest to the exposed surfaces of the stacked body, and holding members respectively engaged directly or through at least one of the separator and the film casing with the recessed sections and the projecting sections of the electrodes arranged closest to the exposed surfaces, the holding members being rigidly secured to the film casing covering the stacked body and sealing the stacked battery, the positive electrodes and the negative electrodes being respectively connected to a positive terminal and a negative terminal.