Battery End Cover Assembly With Nested Vent Impurity Barrier
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Solution Overview
Problem
Existing battery technologies face challenges in ensuring the safety of battery units due to the risk of external impurities entering through the pressure relief mechanism, which can lead to corrosion and safety hazards during internal pressure release.
Innovation Solution
An end cover assembly with a pressure relief mechanism and a protective sheet, featuring a double-layer convex protection system and a concave part that communicates with the external space, is designed to reduce the risk of external impurities entering and improve airtightness detection, while the protective sheet covers the through hole to prevent impurities from entering during pressure release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a through hole is provided in the end cover for pressure relief, then the pressure relief mechanism can release internal pressure, but external impurities may enter through the through hole causing corrosion
Solution Approach 1:
The patent implements a nested structure where the first convex part and second convex part are arranged concentrically around the through hole, creating multiple protective layers. The first concave part is formed between these convex parts, forming a nested configuration that traps impurities before they can reach the through hole, thus protecting the pressure relief mechanism while maintaining its function
Solution Approach 2:
The first concave part acts as an intermediary chamber between the external environment and the through hole. It captures and holds external impurities that penetrate through the first convex part, preventing them from reaching the pressure relief mechanism. This intermediary structure serves as a buffer zone that maintains the reliability of the pressure relief function while blocking harmful impurities
2Ease of manufacture
If the end cover structure is simplified, then manufacturing is easier, but airtightness detection accuracy may be compromised
Solution Approach 1:
The first concave part serves multiple functions simultaneously: it acts as a protective barrier against impurities, provides a communication channel for airtightness detection, and maintains structural integrity. This multi-functional design achieves both ease of manufacture and accurate airtightness detection without requiring separate components for each function
Data Source
AI summary
Provided are an end cover assembly, a battery unit, a battery, and an electricity consuming apparatus. The end cover assembly includes an end cover, a pressure relief mechanism, and a protective sheet. The end cover includes a main body part and a protruding part which protrudes from the main body part along the thickness direction of the end cover. The end cover is provided with a through hole which passes through the main body part and the protruding part. The pressure relief mechanism is disposed on a side of the main body part away from the protruding part and covers the through hole. The protective sheet is attached to a surface of the protruding part away from the main body part and covers the through hole. The protruding part includes a first convex part and a second convex part.