Dual-Exterior Battery Venting for Cooler Overcharge Gas Release
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Solution Overview
Problem
Existing batteries release high-temperature gas to the outside during overcharging, posing safety risks.
Innovation Solution
A battery design with a first exterior body enclosing an electrode element, sealed by a second exterior body with a weak portion and a check valve, allowing gas to be contained and cooled before release, and a controlled flow mechanism to minimize external reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single exterior body seals the electrode element, then the structure is simple, but high-temperature gas is released to the outside during overcharging
Solution Approach 1:
The exterior body is divided into two separate exterior bodies (first exterior body and second exterior body) that enclose the electrode element together. This segmentation allows the system to contain and cool gas internally while providing a controlled release path, resolving the contradiction between structural simplicity and preventing harmful high-temperature gas release.
Solution Approach 2:
The second exterior body acts as an intermediary layer between the electrode element and the external environment. It provides a buffer zone where gas can be cooled before release, and includes a check valve that mediates the controlled release of gas, preventing direct high-temperature gas release to the outside.
2Speed
If gas is released directly to the outside, then the pressure relief is immediate, but the gas temperature remains high causing safety risks
Solution Approach 1:
The system performs preliminary cooling action on the gas between the first and second exterior bodies before the gas is released to the outside. This preliminary action reduces the gas temperature while maintaining the pressure relief function, resolving the contradiction between immediate pressure relief and temperature reduction.
Solution Approach 2:
The space between the first and second exterior bodies serves as a cushioning zone where gas can be temporarily contained and cooled. This beforehand cushioning allows the gas to lose heat before reaching the check valve and being released, preventing high-temperature gas release while maintaining pressure relief capability.
3Reliability
If the sealing portion is made strong throughout, then gas containment is improved, but gas cannot be released during overcharging
Solution Approach 1:
The sealing portion of the second exterior body has different properties at different locations: most of the sealing portion has high sealing strength for gas containment, while a specific part (the weak portion) has lower sealing strength to allow controlled gas release. This local differentiation resolves the contradiction between gas containment and gas release.
Solution Approach 2:
The sealing strength parameter of the second exterior body is changed locally at the weak portion, creating a gradient from high sealing strength in most areas to low sealing strength at the release point. This parameter change enables the system to maintain gas containment while providing a controlled release path during overcharging.
4Object-affected harmful factors
If additional heat insulation components are added, then high-temperature gas protection is improved, but device complexity increases
Solution Approach 1:
The space between the first and second exterior bodies, which could be seen as an additional component, is utilized as a passive heat dissipation zone. The gas cools naturally in this space before reaching the check valve, converting the potential complexity of active cooling systems into a simple passive thermal management solution.
Solution Approach 2:
The system uses the natural thermal conduction and convection in the space between the two exterior bodies to cool the gas without requiring additional active cooling components. The structure itself provides the heat dissipation function, eliminating the need for separate heat insulation or active cooling systems.
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
Prevents high-temperature gas release, reducing reaction risks and eliminating the need for additional heat insulation, while controlling gas flow to prevent ignition.
Implementation Method 1
gas generated from the electrode element is cooled between the two exterior bodies
Implementation Method 2
gas generated from the electrode element is cooled between the two exterior bodies
Data Source
AI summary
A battery includes an electrode element, a first exterior body that encloses and seals the electrode element, and a second exterior body that encloses and seals the first exterior body and that has a sealing portion. A part of the sealing portion of the second exterior body has a weak portion having a lower sealing strength than the rest of the sealing portion.