Tab Bending Design for Short-Circuit Prevention in Battery Storage
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Solution Overview
Problem
Existing electricity storage apparatuses face a risk of short-circuit due to unintentional contact between the electrode assembly, tab, and casing, as current solutions do not adequately prevent contact between the tab and the electrode assembly.
Innovation Solution
The design positions the tab's distal end above the conductive member, with a second bent part disposed above the conductive member, ensuring that even if the tab is displaced downward, it avoids contact with the electrode assembly, thereby reducing the risk of short-circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tab is bent to position its end above the conductive member, then the risk of short-circuit between tab and electrode assembly is suppressed, but the tab structure becomes more complex
Solution Approach 1:
The tab's structural function (electrical connection) and protective function (short-circuit prevention) are merged into a single bent configuration. The same tab that provides electrical connectivity also serves as the protective element by positioning its end above the conductive member, eliminating the need for separate insulating components and reducing overall device complexity.
Solution Approach 2:
The bent tab configuration serves multiple functions simultaneously: it maintains electrical connectivity between components, positions the tab end above the conductive member to prevent short-circuit with the electrode assembly, and works in conjunction with the conductive member to provide mechanical support and electrical pathways. This multi-functionality reduces the need for additional specialized components.
Data Source
AI summary
An electricity storage apparatus 100 may include: an electrode assembly 3 including a positive electrode and a negative electrode; a tab 9 including one end which is electrically connected to the electrode assembly 3; and a conductive member 20 disposed above the electrode assembly 3, and electrically connected to the tab 9. The tab 9 may include a first bent part 14 provided in a vicinity of the one end of the tab 9, a second bent part 16 provided in a vicinity of another end of the tab 9, and a joining part 18 provided between the first bent part 14 and the second bent part 16 and joined to the conductive member 20. The second bent part 16 may be bent so that the other end of the tab 9 is disposed above the conductive member 20.