Battery Pack Vent Cover Assembly for One-Way Gas Discharge
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Solution Overview
Problem
Existing battery packs face challenges in efficiently discharging vent gases while preventing backflow and foreign materials from entering the cells, particularly in modular forms used for high-power applications like electric cars.
Innovation Solution
A battery pack design featuring a cover assembly with a first cover member and a second cover member, where the second cover member overwraps the first, incorporating a fracture line and hinge part to allow vent gas discharge in one direction while preventing backflow, using materials like MICA sheets, ceramic, aluminum, and Teflon films, and arranged to abut vent parts on the battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent cover structure is added to prevent backflow and foreign materials, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The cover member is divided into a body portion and a vent cover portion that can move independently. The vent cover portion is separated from the main body and can rotate or displace relative to it, allowing the system to maintain a sealed structure while enabling controlled venting functionality.
Solution Approach 2:
The vent cover portion is designed to be dynamic rather than static. It can rotate about a hinge axis or displace along a predetermined path in response to pressure changes, transitioning between closed and open states to control gas flow while maintaining structural integrity.
2Productivity
If the vent cover width is increased to improve gas discharge, then venting efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The vent cover portion extends beyond the vent hole in a direction perpendicular to the gas flow path. This lateral extension provides a larger surface area for pressure actuation and more stable hinge mounting without increasing the flow cross-section, thereby improving responsiveness without requiring higher manufacturing precision for the flow path itself.
Data Source
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AI summary
A battery pack includes battery cells including vent parts, a first cover on the battery cells, the first cover including vent holes corresponding to the vent parts, respectively, and a second cover overlapping the first cover and including vent covers corresponding to the vent holes in the first cover, respectively, each of the vent covers including a fracture line and a hinge part in a periphery of the vent cover, and the hinge part and a part of the fracture line in the second cover having a non-overlapping relationship with a corresponding one of the vent holes in the first cover.