Flexible Battery Wiring for Early Fatigue Damage Detection
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Solution Overview
Problem
Lithium-ion storage batteries face safety concerns due to fatigue damage accumulation, which can lead to structural breakage and potential explosions, especially in flexible devices where deformation increases stress on the exterior body and tab electrodes, making it difficult to prevent accidents after damage occurs.
Innovation Solution
A flexible storage battery design incorporating a wiring system that is more easily breakable than the exterior body or tab electrodes, connected to a circuit that detects damage and sends alerts to users before component failure, allowing for timely replacement and preventing further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the exterior body and tab electrodes are made durable to withstand repeated deformations, then the structural integrity is improved, but the ability to detect fatigue damage before catastrophic failure is worsened
Solution Approach 1:
A wiring is provided that is more easily breakable than the exterior body or tab electrode, serving as a preliminary damage indicator. When the wiring breaks due to fatigue from repeated deformations, it provides early warning of potential structural issues before they affect the more durable exterior body or tab electrode, enabling preventive maintenance
Solution Approach 2:
The wiring is designed as a sacrificial component with lower durability compared to the exterior body and tab electrode. This disposable-like element is intentionally made to fail first, providing a cost-effective early warning mechanism that prevents more expensive structural components from failing
2Reliability
If a detection mechanism is added to alert users of fatigue damage, then safety is improved, but the device complexity increases
Solution Approach 1:
The wiring serves a dual function: it provides electrical connectivity while simultaneously acting as a built-in fatigue damage sensor. The wiring's own breakage due to fatigue directly indicates structural issues, eliminating the need for separate complex detection mechanisms and achieving self-monitoring functionality
Data Source
AI summary
To provide a lithium-ion storage battery or electronic device that is flexible and highly safe. One embodiment of the present invention is a flexible storage battery including a positive electrode, a negative electrode, a separator between the positive electrode and the negative electrode, an exterior body that surrounds the positive electrode, the negative electrode, and the separator, and a wiring provided along the exterior body. At least part of the wiring is more easily breakable by deformation than the exterior body. The wiring is more vulnerable to deformation than the exterior body and thus damaged earlier than the exterior body. Damage to the wiring is detected and an alert is sent to a user; thus, the use of the storage battery can be stopped before the exterior body is damaged.