Secondary Battery Insulation Tape Configuration
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Solution Overview
Problem
Existing secondary battery designs face challenges in preventing short circuits between terminals and the cap plate, particularly due to the risk of insulation tape tearing, which can lead to increased manufacturing costs and reduced battery reliability.
Innovation Solution
The use of a first insulation tape covering the cap plate and side walls of the can, combined with a thicker second insulation tape between the first terminal and the first insulation tape, effectively prevents short circuits by ensuring secure adhesion and reducing the likelihood of tape tearing, while a fixing member secures the terminal to the bare cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single insulation tape is used between the terminal and cap plate, then the structure is simple, but the risk of short circuit increases due to tape tearing
Solution Approach 1:
The insulation structure is divided into two separate tapes: a first insulation tape between the terminal and cap plate, and a second insulation tape between the first insulation tape and cap plate. This segmentation ensures that if one tape tears, the other still provides insulation, thus preventing short circuits while maintaining structural simplicity
Solution Approach 2:
The dual-tape configuration acts as a preventive measure against tape tearing. By having redundant insulation layers in place before operation, the design cushions against the potential failure mode of single-tape tearing, ensuring continuous short circuit prevention
2Reliability
If thicker insulation tape is used throughout, then short circuit prevention is improved, but the battery thickness increases
Solution Approach 1:
The second insulation tape, which is thicker, is positioned only at the critical location where the terminal connects to the cap plate. This localized thickening provides enhanced insulation exactly where short circuit risk is highest, without increasing the overall battery thickness throughout the entire structure
3Reliability
If insulation tape is extended over side walls, then short circuit prevention is improved, but manufacturing complexity increases
Solution Approach 1:
The first insulation tape extends partially over the side walls of the can, providing just enough coverage to prevent short circuits between the terminal and cap plate without requiring full circumferential coverage. This partial extension achieves the necessary insulation while simplifying the manufacturing process compared to complete side wall coverage
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly reduces the possibility of short circuits and manufacturing costs, allowing for a thinner and more reliable secondary battery design.
Implementation Method 1
At least one selected from a surface of the second insulation tape facing the first insulation tape and another surface of the second insulation tape facing the first terminal may be adhesive
Data Source
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AI summary
A secondary battery is disclosed. In one aspect, the battery includes a bare cell having a substantially prismatic shape, a first terminal located in a first region of a first surface of the bare cell and a second terminal located in a second region of the first surface of the bare cell. The battery also includes a first insulation tape located between the bare cell and the first terminal, wherein the first insulation tape covers the first surface of the bare cell, and second and third surfaces of the bare cell extending in a direction that crosses the first surface of the bare cell. The battery also includes a second insulation tape located between the first insulation tape and the first terminal.