Sliding Upper Cover for Rechargeable Battery Pressure Management
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Solution Overview
Problem
Rechargeable batteries face challenges in managing internal pressure and safety during overcharge, particularly in preventing excessive heat and reducing pressure when internal or external short-circuiting occurs, which can lead to safety hazards.
Innovation Solution
The rechargeable battery design incorporates an upper cover that is slidably installed with a positioning groove, a short circuit member that can deform to connect with a terminal, and an exhaust groove system to manage internal pressure by allowing gas to escape externally, thereby stabilizing the short circuit member and preventing further deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a short circuit member is provided to prevent short-circuiting between electrodes, then battery safety is improved, but internal pressure increases when the short circuit member deforms during overcharge
Solution Approach 1:
The patent extracts the harmful gas accumulated during overcharge through the exhaust groove in the upper cover, separating the gas removal function from the short circuit member's primary function of preventing electrode contact. This allows the short circuit member to maintain safety while the exhaust system manages pressure buildup.
Solution Approach 2:
The upper cover with exhaust groove acts as an intermediary component between the battery interior and exterior, providing a controlled path for gas escape. This mediator allows pressure management without compromising the short circuit member's safety function.
2Stress or pressure
If the upper cover is made movable to allow gas escape, then pressure management is improved, but the structure becomes more complex
Solution Approach 1:
The upper cover transitions from a static component to a dynamic one, capable of sliding along the second terminal. This dynamic design allows the cover to automatically respond to internal pressure changes, moving to an extended position when gas needs to escape and returning when pressure normalizes.
Solution Approach 2:
The exhaust system operates autonomously based on internal pressure conditions. When pressure increases during overcharge, the upper cover automatically slides to expose the exhaust groove, allowing gas escape without external intervention. The system self-regulates based on the physical state of the battery interior.
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 enhances safety by effectively managing internal pressure and preventing excessive heat buildup during overcharge, ensuring stable operation of the short circuit member and reducing the risk of further pressure increases.
Implementation Method 1
the short circuit member being deformable to electrically connect the cap plate to the second terminal
Implementation Method 2
an exhaust groove system to manage internal pressure by allowing gas to escape externally
Data Source
AI summary
A rechargeable battery including an electrode assembly including a first electrode and a second electrode, a case that receives the electrode assembly therein, a first terminal electrically connected to the first electrode, a second terminal electrically connected to the second electrode, a cap plate coupled with an opening of the case and electrically connected to the first electrode, the cap plate including a short circuit hole, a short circuit member located in the short circuit hole, the short circuit member being deformable to electrically connect the cap plate to the second terminal, and an upper cover that covers the short circuit hole. The second terminal includes a positioning groove into which a lateral end of the upper cover is insertable, the upper cover being slidably installed with respect to the second terminal.