End Cover Assembly Venting Path for Faster Explosion-Proof Valve Opening
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Solution Overview
Problem
The existing energy storage devices suffer from an unsmooth exhaust channel between the current collector plate and the cover plate, leading to delayed opening of the explosion-proof valve during thermal runaway, compromising safety.
Innovation Solution
An end cover assembly with limiting protrusions on the cover plate and a current collector plate design that prevents blockage of the exhaust channel, ensuring timely pressure relief through the explosion-proof valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the exhaust channel between the current collector plate and the cover plate is narrow, then the structural compactness is improved, but the gas exhaust smoothness deteriorates
Solution Approach 1:
The exhaust channel is segmented into multiple paths by creating exhaust holes at different positions on the cover plate, allowing gas to escape through multiple routes simultaneously, thereby improving exhaust efficiency without increasing the overall structural volume
Solution Approach 2:
The exhaust channel design transitions from a single narrow path to a multi-dimensional exhaust system with holes distributed across different locations and depths on the cover plate, creating three-dimensional exhaust pathways that improve gas flow without compromising compactness
2Device complexity
If the exhaust channel is narrow, then the device complexity is reduced, but the explosion-proof valve opening timeliness deteriorates
Solution Approach 1:
The exhaust holes are pre-positioned and pre-sized during manufacturing to ensure optimal gas flow characteristics, and the cover plate geometry is predetermined to guide gas flow toward the explosion-proof valve, ensuring timely valve activation without complex control mechanisms
Solution Approach 2:
The cover plate acts as an intermediary component that mediates between the internal gas pressure and the explosion-proof valve, using its geometric design and exhaust hole configuration to channel and direct gas flow efficiently to trigger the valve at the appropriate moment
3Manufacturing precision
If the exhaust channel is unsmooth, then the manufacturing precision requirements are reduced, but the safety performance deteriorates
Solution Approach 1:
Different regions of the cover plate have different qualities - the exhaust holes are positioned and sized with specific precision in critical areas to ensure proper gas flow, while other areas of the cover plate can have standard manufacturing tolerances, thus achieving safety performance without requiring high precision throughout the entire component
Solution Approach 2:
The design optimizes specific parameters such as exhaust hole diameter, position, and distribution pattern to achieve smooth gas flow characteristics, while maintaining these parameters within manufacturable ranges that balance precision requirements with manufacturing capabilities
Data Source
AI summary
The present disclosure provides an end cover assembly, an energy storage device, and an electricity-consumption apparatus. The end cover assembly includes a cover plate, an explosion-proof valve, and a current collector plate. The cover plate has a first surface and a second surface that are opposite to each other. The cover plate has a mounting hole and an explosion-proof hole that are spaced apart from each other. The explosion-proof valve is mounted at the cover plate and covers the explosion-proof hole. The current collector plate includes a main body portion, a first step portion, and a second step portion. The main body portion is located at a side of the first surface facing away from the second surface. The first step portion is disposed at the first face of the main body and abuts with the first surface. The second step portion passes through the mounting hole.