Battery Cover Vent Structure for Stable Heat-Resistant Sheet Retention
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Solution Overview
Problem
The existing cover assembly designs for batteries are prone to instability due to a small contact area between the heat-resistant sheet and the boss, leading to potential detachment during high-pressure airflow, compromising safety during thermal runaway events.
Innovation Solution
A cover assembly design that incorporates a boss surrounding the pressure relief hole, creating an accommodation space for the heat-resistant sheet, which is fixed within this space to ensure proper coverage and stability, preventing the sheet from falling off even under side airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heat-resistant sheet is connected to the top portion of the boss, then the pressure relief hole can be covered, but the connection is unstable and the sheet may fall due to small contact area
Solution Approach 1:
The patent transitions from a one-dimensional connection (sheet attached to top surface of boss) to a two-dimensional solution by creating a recessed accommodation space within the boss. The sheet is placed inside this recessed area, increasing the contact area from a small top surface to a larger bottom surface of the recess, thereby improving connection stability without increasing the external footprint.
2Object-affected harmful factors
If the heat-resistant sheet covers the pressure relief hole, then high-temperature substances are blocked, but pressure release may be hindered if the sheet is too large
Solution Approach 1:
The patent applies local quality by creating a recessed accommodation space with specific dimensional characteristics. The recessed structure provides localized containment for the heat-resistant sheet, allowing it to cover the pressure relief hole effectively while the recessed walls prevent the sheet from extending too far and blocking the pressure release path. This localized structural modification optimizes both protective and venting functions.
Data Source
AI summary
A cover assembly, a battery and an electronic device are provided. The cover assembly includes a cover body, a boss, and a heat-resistant sheet. A pressure relief hole is provided on the cover body. The boss is disposed on the top surface of the cover body, and surrounds the outer periphery of the pressure relief hole. The boss encloses a first region communicated with the pressure relief hole, and together with the pressure relief hole constitute an accommodation space. The heat-resistant sheet is disposed in the accommodation space and at least partially covers the pressure relief hole.