Rechargeable Battery External Short-Circuit Pressure Relief
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Solution Overview
Problem
Rechargeable batteries face the risk of ignition or explosion due to excessive internal pressure caused by heat generation or electrolyte decomposition during charging and discharging, which existing designs fail to adequately prevent by allowing external alien materials and moisture to permeate and not effectively discharging pressure.
Innovation Solution
The rechargeable battery incorporates an external short-circuit part with an insulator and cap combination that forms a meandering path with barriers to prevent alien material permeation and discharge internal pressure through a series of gaps and outlets when the membrane is inversely deformed, utilizing an inner and outer insulating portion to ensure efficient pressure release and material exclusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the external short-circuit part includes a through-hole in the connection plate to allow membrane deformation, then the membrane can be inversely deformed to contact the connection plate for short-circuiting, but external alien materials and moisture can permeate through the through-hole into the battery
Solution Approach 1:
The connection plate is divided into a solid portion and a through-hole portion, creating distinct functional zones. The solid portion provides structural support and blocks alien materials, while the through-hole portion allows membrane deformation for short-circuiting. This segmentation resolves the contradiction by separating the conflicting requirements of material blocking and deformation allowance.
Solution Approach 2:
The membrane acts as an intermediary element between the external environment and the battery interior. It selectively responds to internal pressure by deforming through the through-hole to establish short-circuit contact, while its flexible nature prevents it from being a permanent open passage for alien materials. The membrane mediates between the need for pressure relief/short-circuiting and the need to block contaminants.
2Stress or pressure
If the external short-circuit part uses a membrane and connection plate structure for pressure discharge, then internal pressure can be relieved when the membrane deforms, but the structure allows alien materials and moisture to enter through the space between components
Solution Approach 1:
The connection plate is segmented into solid and through-hole portions, creating a structured pathway system. The solid portions block alien materials while the through-hole portions provide controlled deformation paths for the membrane. This segmentation allows pressure discharge functionality while maintaining protection against contaminant ingress.
Solution Approach 2:
The membrane is implemented as a flexible thin film that can deform in response to internal pressure changes. This flexible film structure allows the membrane to bulge and contact the connection plate for short-circuiting while maintaining a continuous barrier that prevents alien materials from penetrating through, resolving the contradiction between pressure discharge and contamination prevention.
3Reliability
If the connection plate is provided with a through-hole for membrane deformation, then the membrane can contact the connection plate to short-circuit, but the through-hole creates space for alien materials and moisture to permeate between the connection plate and membrane
Solution Approach 1:
The connection plate structure is segmented into solid portions and through-hole portions. The solid portions maintain structural integrity and block alien materials, while the through-hole portions provide localized deformation paths. This segmentation resolves the contradiction by creating a structure that allows necessary deformation for short-circuiting while maintaining barriers against contaminant entry.
Solution Approach 2:
The membrane is designed as a flexible thin film that selectively deforms through the through-hole openings. The flexibility of the membrane allows it to bulge and contact the connection plate for electrical short-circuiting when internal pressure increases, while the membrane itself acts as a barrier that prevents alien materials from passing through the deformation path.
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 design effectively prevents the permeation of external materials and moisture while efficiently discharging internal pressure, thereby reducing the risk of ignition or explosion by creating a longer path for pressure and material discharge, enhancing safety and reliability.
Implementation Method 1
a membrane that is connected to the cap plate to maintain a separated state with the connection plate and is then inversely deformed to contact the connection plate
Implementation Method 2
a path is formed between the insulator and the cap for discharging the internal pressure and preventing permeation of alien materials into the outlet
Data Source
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AI summary
The invention relates to a rechargeable battery with an external short-circuit part (40) having a membrane (43) that is deformed and short-circuits the battery in case an overpressure emerges inside the battery. In order to allow this overpressure to be released without external material entering the battery via a through-hole (H44) for releasing the overpressure, the battery according to the claimed invention is provided with a cap (90) that forms a path with an insulator (80) of the external short-circuit part (40) for discharging the pressure.