Battery Gasket Permeability for Internal Pressure Control
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Solution Overview
Problem
Existing secondary batteries face challenges in managing the rapid increase in internal pressure due to gas generation during charging and discharging, which can lead to premature case deformation and reduced durability.
Innovation Solution
A secondary battery design that sets a parameter K, calculated as Wi/(Vr*GH2), where Wi is the initial capacity, Vr is the volume of void in the battery case, and GH2 is the hydrogen gas permeability coefficient of the gasket, within the range of 0.43×10^8 to 0.59×10^8, to control internal pressure buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas is generated inside the battery case during charging/discharging, then the internal pressure increases rapidly, but the battery case may deform prematurely and durability is reduced
Solution Approach 1:
The gasket serves as an intermediary component between the battery case and electrode terminal. It provides a controlled gas permeability pathway that allows gradual gas release while maintaining the sealing function. The gasket's intermediate permeability characteristic prevents rapid pressure buildup without requiring case deformation or failure
Solution Approach 2:
The invention changes the permeability parameter of the gasket material to optimize gas release. By selecting a gasket with specific hydrogen gas permeability coefficient (GH2) in the range of 35.5×10^-10 to 51.8×10^-10 (cm³·cm)/(cm²·s·cmHg), the system controls the rate of gas permeation to maintain pressure within acceptable limits over the battery's operational life
2Object-generated harmful factors
If existing gas release technologies are used (exterior can deformation or combined gaskets), then gas can be discharged to the outside, but the structural complexity increases or the case integrity is compromised
Solution Approach 1:
The gasket performs multiple functions simultaneously: it provides electrical insulation between the electrode terminal and battery case, maintains the sealing relationship, and controls gas permeability. This multi-functionality eliminates the need for separate gas release mechanisms, reducing structural complexity while effectively managing gas accumulation
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 effectively reduces the degree of pressure increase over time, enhancing the battery's performance and durability by preventing the need for physical case opening, allowing prolonged suitable use.
Implementation Method 1
GH2 represents an H2 gas permeability coefficient (cm3·cm)/(cm2·s·cmHg) of the gasket
Data Source
AI summary
A secondary battery with a reduced degree of increase in internal pressure over time, is provided. In a preferred embodiment, a secondary battery including: an electrode body, a battery case, an electrode terminal, and a gasket sandwiched between the battery case and the electrode terminal is provided. The secondary battery is configured such that a parameter K calculated using the following equation (1): K=Wi/(VrGH2) (1) (where Wi represents an initial capacity (Ah) of the secondary battery, Yr represents a volume (cm3) of void in the battery case, and GH2, represents an H2 gas permeability coefficient (cm3·cm)/(cm2·s·cmHg) of the gasket at 60° C.) satisfies 0.43×108 or more to 0.59×108 or less.