Battery Tab Protection Structure for Steel-Shell Cell Movement
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Solution Overview
Problem
Steel-shell batteries face issues during mechanical tests due to gaps between the cell tab and the housing, leading to tab tearing, disconnection, or short-circuiting, which compromises battery safety.
Innovation Solution
A battery design incorporating a protection member with a body portion and protruding portion that abuts against the cell and housing, respectively, limiting the cell's movement and preventing tab damage during mechanical tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a gap is left between the cell and housing for assembly tolerance, then ease of manufacture is improved, but the tab becomes prone to tearing and disconnection during mechanical tests
Solution Approach 1:
The protection member serves as an intermediary component between the cell and housing. It fills the gap created by assembly tolerance while providing mechanical support to the tab. The protection member includes a cell contact portion that abuts against the cell body and a housing contact portion that abuts against the housing inner wall, thereby stabilizing the tab connection without compromising ease of manufacture.
2Reliability
If the cell is firmly fixed in the housing to prevent movement, then reliability during mechanical tests is improved, but device complexity increases due to additional fixation structures
Solution Approach 1:
Instead of implementing complex fixation structures throughout the housing, the protection member applies localized support only where needed. The cell contact portion provides support at the cell body location, while the housing contact portion provides support at the housing inner wall location. This localized approach ensures cell positioning stability during mechanical tests without significantly increasing device complexity.
3Reliability
If the protection member is made thicker to better protect the tab, then reliability is improved, but volume of the battery increases
Solution Approach 1:
The protection member is segmented into distinct functional portions: a cell contact portion that abuts against the cell body and a housing contact portion that abuts against the housing inner wall. This segmentation allows the protection member to provide effective tab protection through strategic positioning rather than increased thickness, thereby maintaining reliability while minimizing battery volume.
Data Source
AI summary
A battery includes: a housing, including a storage cavity, and opposing first surface and second surface; a terminal, connected to the first surface, where one end of the terminal protrudes from the housing; a cover plate, connected to the housing; a cell, disposed in the storage cavity, where the cell includes a main body and a tab, two ends of the tab are respectively connected to the main body and the terminal, a side of the main body facing away from the tab abuts against the second surface; and a protection member, disposed between the first surface and the cell, where the protection member includes a body portion and a protruding portion connected to and protruding from the body portion, the body portion abuts against the cell, and the protruding portion abuts against the first surface. The battery of the present disclosure can exhibit high safety performance.