Battery Cell Vent Support to Keep Pressure Relief Unblocked
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Solution Overview
Problem
Existing battery cells face reliability issues due to the electrode assembly blocking the pressure relief mechanism during high-temperature and high-pressure conditions, leading to inefficient discharge of gases and increased risk of explosion.
Innovation Solution
A battery cell design incorporating a supporting member opposite the pressure relief mechanism to limit the electrode assembly's movement, maintaining a clear discharge channel and facilitating rapid release of high-temperature and high-pressure substances through a gas discharge channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electrode assembly is allowed to move freely during high-temperature and high-pressure conditions, then the battery cell can respond to pressure changes, but the electrode assembly may block the pressure relief mechanism, reducing reliability
Solution Approach 1:
A supporting member is introduced as an intermediary component between the electrode assembly and the pressure relief mechanism. This supporting member prevents the electrode assembly from directly blocking the pressure relief mechanism while still allowing the battery cell to respond to pressure changes, thus resolving the contradiction between adaptability and reliability
Solution Approach 2:
The supporting member is pre-positioned to limit the movement range of the electrode assembly before high-temperature and high-pressure conditions occur. This preliminary positioning ensures that even under extreme conditions, the electrode assembly cannot move far enough to block the pressure relief mechanism, maintaining reliability while preserving pressure response capability
2Reliability
If the supporting member is positioned close to the pressure relief mechanism to prevent blocking, then the pressure relief mechanism is protected, but the discharge channel may be blocked by the supporting member itself
Solution Approach 1:
The supporting member is designed with differentiated local properties: it has a first surface facing the electrode assembly that provides blocking protection, and a second surface facing the pressure relief mechanism that maintains discharge channel clearance. This local quality differentiation allows the same component to fulfill both protective functions without contradiction
3Productivity
If the electrode assembly moves toward the first wall during thermal runaway, then pressure relief can occur, but the discharge channel may become blocked, reducing discharge efficiency
Solution Approach 1:
The supporting member acts as a mediator that guides the electrode assembly's movement during thermal runaway. It allows the electrode assembly to move toward the first wall for pressure relief while preventing it from moving far enough to block the discharge channel, thus maintaining discharge efficiency while enabling pressure relief
Data Source
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AI summary
A battery cell, a battery, and an electric apparatus are capable of improving the reliability of the battery cell. The battery cell includes: a casing, having a first wall; a pressure relief mechanism, arranged on the first wall; an electrode assembly, accommodated in the casing; and a supporting member, arranged opposite to the pressure relief mechanism and configured to limit the electrode assembly from moving toward the first wall.