Battery Cover Plate Venting Structure for Directional Burst Control
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Solution Overview
Problem
The burst direction of explosion-proof structures in battery cover plates is uncertain, leading to unpredictable ejection of substances that can affect surrounding batteries and expand the thermal runaway influence.
Innovation Solution
A cover plate design with a body featuring a sinking table and a boss, where the explosion-proof groove is located, ensuring the groove bursts first from the sinking table, providing a directional burst and reducing the uncertainty in ejection direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explosion-proof structures are installed on battery cover plates, then safety against thermal runaway is improved, but the burst direction becomes uncertain causing substances to be ejected randomly
Solution Approach 1:
The cover plate employs an asymmetric structure with a boss and sinking table that create a predetermined burst direction. The explosion-proof groove is strategically positioned and shaped to ensure that when pressure builds up, the groove bursts in a specific direction (toward the first side surface) rather than randomly. This asymmetric design allows the cover plate to maintain safety functionality while controlling the ejection path of substances away from surrounding batteries.
Solution Approach 2:
The explosion-proof groove is pre-formed in the cover plate with specific geometric features (first sub-groove on the sinking table, second sub-groove on the boss) that are designed to fail in a predetermined manner. This preliminary structuring ensures that when thermal runaway occurs and pressure builds up, the burst direction is already determined by the groove's geometry and position, preventing random ejection of substances.
2Strength
If the explosion-proof groove is positioned on the boss, then structural strength is improved, but the burst direction control becomes more complex
Solution Approach 1:
The explosion-proof groove is merged with the existing boss structure of the cover plate. The groove is formed by integrating the first sub-groove on the sinking table and the second sub-groove on the boss, creating a continuous failure path that leverages the boss's inherent structural strength. This merging approach allows the groove to be positioned on the strength-critical boss area while using the boss's geometry itself to help control the burst direction, rather than adding separate complex control mechanisms.
Solution Approach 2:
The cover plate features localized variations in structure: the boss provides enhanced strength at a specific location, while the sinking table and groove create a localized weakness in a predetermined position. This local quality approach allows the overall cover plate to maintain high structural strength through the boss, while the localized groove area is designed to fail in a controlled manner, achieving both strength and burst direction control without excessive overall complexity.
Data Source
AI summary
A cover plate, a battery, and a battery pack are provided. The cover plate includes a body and an explosion-proof. The body includes a first sub-part and a second sub-part. The second sub-part includes a sinking table and a boss connected. The second sub-part includes a first side surface and a second side surface disposed oppositely. The boss is higher than the sinking table and the first sub-part. The explosion-proof groove is disposed on the first side surface. A first sub-groove of the explosion-proof groove is at least partially located on the sinking table. A second sub-groove of the explosion-proof groove is located on the boss.