Battery Pack Venting Structure to Prevent Fire-Resistant Sheet Sagging
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Solution Overview
Problem
The fire-resistant sheet in battery packs can sag or separate from the pack cover due to heat deterioration, reducing the venting space and compromising thermal management, leading to potential explosions or fires.
Innovation Solution
A battery pack design featuring protruding pins on the battery module that support the fire-resistant sheet, maintaining a stable venting space and preventing separation, even under thermal events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fire-resistant sheet is attached to the pack cover using heat-resistant adhesive, then the pack cover is protected from high-temperature venting gas and heat, but the adhesive performance deteriorates due to heat over time, causing the sheet to sag or separate
Solution Approach 1:
The patent extracts the fire-resistant sheet from its traditional adhesive-only attachment method and introduces a separate support structure (protruding pins or ribs) that mechanically supports the sheet independently of the adhesive, thereby eliminating the reliance on heat-deteriorating adhesive for maintaining sheet position and venting space
Solution Approach 2:
The patent introduces protruding pins or ribs as an intermediary mechanical support structure between the pack cover and the fire-resistant sheet. This intermediary structure provides stable support for maintaining venting space without being affected by heat-induced adhesive deterioration
2Volume of stationary object
If the fire-resistant sheet sags or separates from the pack cover, then the venting space is reduced, but thermal management performance deteriorates
Solution Approach 1:
The patent implements preliminary action by pre-installing protruding pins or ribs on the pack cover before attaching the fire-resistant sheet. These structural features are designed in advance to maintain the necessary venting space, preventing sheet sagging or separation before it can occur during thermal events
3Productivity
If multiple battery cells are arranged in a battery module, then capacity and power are improved, but the risk of thermal events and heat propagation increases
Solution Approach 1:
The patent applies segmentation by dividing the battery module into smaller thermal zones using fire-resistant sheets positioned between battery cell stacks. This segmentation prevents heat propagation from one thermal event to affect adjacent cells, thereby enabling higher battery capacity while mitigating heat propagation risk
Solution Approach 2:
The patent converts the harmful effect of high-temperature venting gas and heat into a beneficial safety mechanism by designing dedicated venting pathways guided by fire-resistant sheets. These pathways channel thermal energy away from sensitive areas, transforming potential damage into controlled heat discharge that protects the battery pack
Data Source
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AI summary
A battery pack according to an embodiment of the present disclosure comprises: a battery module; a pack frame in which the battery module is housed and one side thereof is open; a pack cover that covers the open one side of the pack frame; and a fire-resistant sheet attached to one end of the pack cover. The battery module comprises a battery cell stack in which a plurality of battery cells are stacked; a venting part formed on one surface of the battery module to discharge venting gas; and a protruding pin that protrudes toward the pack cover on one surface of the battery module.