Battery Pack Vent Sheet Structure for Flame Spread Suppression
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Solution Overview
Problem
Existing battery packs lack effective mechanisms to prevent the spread of flames and scattering of high-temperature solids between battery cells, which can lead to chain ignition reactions and damage neighboring cells.
Innovation Solution
A battery pack design featuring insulating protective sheets with thin units having sloping gradient cross-sectional profiles that cover the vents of battery cells, forming closed structures inside and open structures outside to contain gas discharge and suppress flame and solid propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If battery cells are arranged in a pack to increase output and capacity, then the energy storage and power output are improved, but the risk of flame spread and chain ignition between cells increases
Solution Approach 1:
The protective sheet is segmented into multiple thin units arranged in an array, creating a patterned structure that provides both coverage and controlled openings for gas discharge while maintaining flame barrier functionality
Solution Approach 2:
The insulating protective sheet acts as an intermediary barrier between adjacent battery cells, preventing direct flame and hot solid contact while allowing controlled gas venting through the thin unit pattern
2Object-affected harmful factors
If a protective sheet covers the vent to prevent flame spread, then flame propagation is suppressed, but gas discharge capability may be compromised
Solution Approach 1:
The protective sheet has non-uniform structure with different regions serving different functions: the thin units provide localized openings for gas discharge while the surrounding material provides flame barrier protection
Solution Approach 2:
The array of thin units creates a porous-like structure that allows gas to pass through while the overall pattern and material properties maintain flame blocking capability
3Object-affected harmful factors
If a dense array of thin units is used to block flames, then flame suppression is improved, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The protective sheet utilizes a thin film structure with patterned cutouts, combining simplicity of base material with functional complexity achieved through the pattern design rather than multi-layer construction
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively suppresses the spread of flames and scattering of high-temperature solids, protecting neighboring battery cells and preventing chain ignition reactions.
Implementation Method 1
the thin pattern may form the closed structure in the inner surface of the insulating protective sheet to fluidly isolate an upper region from a lower region of the insulating protective sheet
Implementation Method 2
The insulating protective sheet is configured do suppress the eruption of flames and/or the scattering of high-temperature solids, thereby preventing the spread of flames to other neighboring battery cells
Data Source
AI summary
Provided is a battery pack. An insulating protective sheet having the plurality of thin units may be disposed on the vent for discharging gas or relieving pressure accumulated inside each of the plurality of battery cells forming the battery pack. The battery pack may suppress eruption of flames or scattering of high-temperature solids in addition to relief of internal pressure or discharge of internal gas, thereby preventing spread of flames to other neighboring battery cells or chain ignition therebetween.