Battery Cell Sealing Structure for Controlled Gas Venting
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Solution Overview
Problem
Existing battery cells lack effective gas discharge mechanisms, leading to venting phenomena that can result in the discharge of flammable gases, which may cause ignition and explosion due to inadequate sealing, particularly when internal pressure increases.
Innovation Solution
A battery cell design featuring a gas discharge portion with a unique sealing pattern that differs from the main sealing portion, allowing controlled gas discharge through a weaker, specifically designed area to direct gas away from the electrode lead location, utilizing alternating indentation and protrusion patterns in different directions to ensure controlled venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform sealing pattern is applied throughout the battery case, then sealing strength is maximized, but gas discharge cannot be effectively controlled when venting occurs
Solution Approach 1:
The sealing case is designed with different sealing patterns in different regions: a first sealing pattern with higher sealing strength in non-gas discharge areas, and a second sealing pattern with controlled sealing strength in the gas discharge portion. This local differentiation allows the sealing case to maintain overall integrity while enabling controlled gas discharge through the specific gas discharge portion when venting occurs.
2Reliability
If no gas discharge mechanism is provided, then sealing integrity is maintained, but venting phenomenon causes uncontrolled gas discharge to vulnerable sealing parts
Solution Approach 1:
The gas discharge portion is designed to convert the harmful venting phenomenon into a controlled and beneficial process. When internal pressure increases, gas is directed to discharge through the specifically designed gas discharge portion rather than uncontrolled discharge to vulnerable sealing parts. The alternating indentation and protrusion structure guides the gas flow in a predetermined direction, transforming the potential hazard into a safe, controlled release mechanism.
3Power
If energy density of battery cells is increased, then power output is improved, but the amount of gas generated inside the battery cells increases
Solution Approach 1:
The battery case is pre-designed with a gas discharge portion and alternating sealing patterns before the venting phenomenon occurs. This preliminary structure ensures that when high energy density batteries generate excessive gas, the discharge path is already prepared and positioned to direct gas away from vulnerable areas, preventing uncontrolled discharge and potential ignition even as gas generation increases with higher energy density.
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
A battery cell according to an embodiment of the present invention includes a battery case including an electrode assembly mounted in a storage portion and a sealing portion having a structure in which an outer periphery thereof is sealed; and an electrode lead electrically connected to an electrode tab included in the electrode assembly and protruding in an outer direction of the battery case via the sealing portion. The sealing portion includes a gas discharge portion, a part of the sealing portion in which the gas discharge portion is not located is formed in a first sealing pattern, the gas discharge portion is formed in a second sealing pattern, and the first sealing pattern and the second sealing pattern are different from each other.