Secondary Battery Tab Support Structure for Short-Circuit Prevention
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Solution Overview
Problem
Secondary batteries face short-circuit risks due to unsupported tabs being bent, which can insert into the electrode assembly, causing safety hazards.
Innovation Solution
Incorporating an insulation member with protrusions and gaps to tuck and support the tabs during bending, preventing deformation and insertion into the electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If tabs are bent to reduce space occupied, then space efficiency is improved, but tabs are likely to be inserted into the electrode assembly causing short-circuit risks
Solution Approach 1:
An insulation member is introduced as an intermediary component between the tabs and the electrode assembly. This insulation member includes a through gap that allows tabs to pass through while providing lateral support to prevent tab insertion into the electrode assembly, thus resolving the contradiction between space efficiency and short-circuit prevention
Solution Approach 2:
The support structure transitions from a planar configuration to a three-dimensional structure with protrusions extending laterally from the insulation member substrate. This dimensional change provides effective lateral support to tabs during bending without occupying excessive space in the primary battery dimensions
2Reliability
If insulation member with protrusions is added to support tabs, then short-circuit prevention is improved, but device complexity increases
Solution Approach 1:
The insulation member serves multiple functions simultaneously: it provides electrical insulation between conductive components, offers lateral support to prevent tab insertion, and maintains structural integrity during battery assembly and operation. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity
Solution Approach 2:
The insulation member is made from insulating material that combines electrical insulation properties with mechanical support capabilities. This composite approach allows a single component to fulfill both insulation and structural support functions without requiring additional specialized materials or components
Data Source
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AI summary
This application provides a secondary battery. The secondary battery includes an electrode assembly, a housing, a top cover assembly, a current collecting member, and an insulation member. The electrode assembly is accommodated in the housing and includes a body portion and a first tab. The first tab extends from one end of the body portion in a transverse direction. The top cover assembly includes a top cover plate and a first electrode terminal disposed on the top cover plate. The top cover plate is connected to the housing, and the first electrode terminal is connected to the current collecting member. The insulation member is disposed between the body portion and the current collecting member. The insulation member includes a through gap. The first tab passes through the gap and is connected to the current collecting member.