Battery Cover Plate Vent Structure for Directional Pressure Relief
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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 sinking table and boss structure, featuring an explosion-proof groove that bursts directionally from the sinking table first, ensuring controlled pressure relief and minimizing the impact on adjacent batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional explosion-proof structures are used on battery cover plates, then pressure relief function is provided, but the burst direction is uncertain causing substances to eject randomly and affect surrounding batteries
Solution Approach 1:
The cover plate employs an asymmetric structure with a sinking table and boss that creates a predetermined burst direction. The explosion-proof groove is positioned specifically on the boss portion, which is structurally asymmetric relative to the sinking table. This asymmetry ensures that when pressure builds up, the explosion-proof groove bursts in a controlled direction away from surrounding batteries, preventing random ejection of substances.
Solution Approach 2:
The explosion-proof groove is pre-formed on the boss portion of the cover plate during manufacturing. This preliminary action creates a predetermined weak point that will burst first under pressure, directing the release of substances in a controlled manner before thermal runaway affects surrounding batteries.
2Device complexity
If the explosion-proof groove is positioned on the sinking table, then the structure is simpler, but the burst direction cannot be controlled
Solution Approach 1:
The cover plate is segmented into two distinct portions: a sinking table and a boss. The explosion-proof groove is specifically positioned on the boss portion rather than the sinking table. This segmentation allows the boss to serve as a dedicated pressure relief component with controlled burst characteristics, while the sinking table provides structural support.
Solution Approach 2:
The boss portion of the cover plate is given different structural properties compared to the sinking table. The explosion-proof groove is locally positioned on the boss, creating a specific weak point with controlled burst characteristics. This local quality difference ensures that the boss bursts in a predetermined direction while the sinking table maintains structural integrity.
Data Source
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AI summary
A cover plate, a battery, and a battery pack are provided. The cover plate includes a body (111) and an explosion-proof (120). The body includes a first sub-part (113) and a second sub-part (114). The second sub-part (114) includes a sinking table (1141) and a boss (1142) connected. The second sub-part (114) includes a first side surface (1143) and a second side surface (1144) disposed oppositely. The boss (1142) is higher than the sinking table (1141) and the first sub-part (113). The explosion-proof groove (120) is disposed on the first side surface (1143). A first sub-groove (121) of the explosion-proof groove (120) is at least partially located on the sinking table (1141). A second sub-groove (122) of the explosion-proof groove (120) is located on the boss (1142).