Cylindrical Battery Insulation Board Structure for Gas Vent Retention
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Solution Overview
Problem
Existing cylindrical batteries face the issue of the insulating plate being released to the outside of the battery during gas discharge due to increased gas discharge rates, potentially causing high-temperature gas to escape and burn adjacent batteries.
Innovation Solution
The insulating plate is designed with a body and folded portions that bias it towards the electrode assembly, preventing release during gas discharge by engaging with the grooved portion of the outer can.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the insulating plate is made with uniform thickness, then the manufacturing is simple, but the insulating plate may be detached during gas discharge
Solution Approach 1:
The insulating plate employs varying thickness across different regions: the center portion has a first thickness while the outer circumferential portion has a second thickness that is greater than or equal to 130% and less than or equal to 300% of the first thickness. This local quality variation strengthens the insulating plate at the outer circumferential portion to prevent detachment during gas discharge, while maintaining reasonable manufacturing complexity.
2Reliability
If the insulating plate outer circumferential thickness is increased to prevent detachment, then the retention improves, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by specifying that the outer circumferential portion thickness is greater than or equal to 130% and less than or equal to 300% of the center portion thickness. This quantitative parameter definition provides a clear manufacturing guideline that balances improved retention with controlled structural complexity, avoiding excessive design complications.
3Productivity
If gas discharge rate increases during abnormality, then the safety response improves, but the insulating plate may be released without being held
Solution Approach 1:
The patent implements preliminary anti-action by pre-reinforcing the outer circumferential portion of the insulating plate with increased thickness (130%-300% of center thickness) before gas discharge occurs. This preventive structural enhancement ensures the insulating plate can resist detachment forces during high-rate gas discharge events, countering the potential release issue before it happens.
Data Source
Figure 1
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Figure 4~5
AI summary
A cylindrical battery (10) comprises: an electrode body (14) in which a positive electrode (11) and a negative electrode (12) are wound with a separator (13) therebetween; an exterior can (20) in which the electrode body (14) is accommodated; a sealing body (19) which is mounted on a grooved part (28) that is formed along the circumferential direction of the exterior can (20) with a gasket (24) therebetween; and an upper insulation board (30) which is disposed between the grooved part (28) and the electrode body (14). The upper insulation board (30) has a body (31) which is mounted on the electrode body (14), and a folded part (32), the outer circumferential part of which is folded towards the body (31). The upper insulation board (30) is biased by the folded part (32) towards the electrode body (14).