Battery Pack Partition Structure for Thermal Runaway Delay
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Solution Overview
Problem
The challenge is to delay thermal propagation within a battery pack during thermal runaway of battery cells, thereby preventing the spread of high-temperature gas and heat, and enhancing the stability and service life of the battery pack.
Innovation Solution
The battery pack incorporates a partitioned structure with insertion members containing fire-resistant particles and a binder, which are strategically placed within the pack case to vent high-temperature gas along intended paths and delay heat propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If empty space is provided in battery pack for cell accommodation, then cell installation flexibility is improved, but thermal propagation risk increases
Solution Approach 1:
A partition structure is introduced as an intermediary element between battery cells to separate the empty space into isolated regions. This partition prevents thermal propagation while maintaining the flexibility to accommodate different cell arrangements, thus resolving the contradiction between installation flexibility and thermal safety.
Solution Approach 2:
The empty space within the battery pack is segmented into multiple isolated regions by partitions. This segmentation prevents the formation of continuous thermal propagation pathways while preserving the overall space for flexible cell installation, addressing both the adaptability and thermal safety requirements.
2Reliability
If partition structure is added to prevent thermal propagation, then fire resistance is improved, but device complexity increases
Solution Approach 1:
The partition is designed as a thin-walled structure with a simple tubular shape that provides effective thermal isolation. This thin-film approach achieves the required fire resistance while minimizing the addition of structural complexity and material usage.
Solution Approach 2:
The partition incorporates a porous structure that provides thermal isolation functionality. The porous material achieves fire resistance through its thermal properties while maintaining a relatively simple overall structure that does not significantly increase device complexity.
3Temperature
If fire-resistant particles are incorporated in insertion member, then heat resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The insertion member is constructed as a composite structure combining a binder material with dispersed fire-resistant particles. This composite approach enhances heat resistance through the fire-resistant particles while using a simple binder matrix that facilitates straightforward manufacturing processes.
Solution Approach 2:
Fire-resistant particles are selectively incorporated into the insertion member at specific locations where thermal protection is most needed. This local quality enhancement provides targeted heat resistance without requiring uniform material composition throughout, simplifying the manufacturing process.
4Strength
If binder is used to bind fire-resistant particles, then structural integrity is improved, but melting point may be reduced
Solution Approach 1:
The binder material is selected or formulated with specific thermal parameters, particularly a melting point that remains above the operational temperature range of the battery pack. This parameter optimization ensures the binder maintains structural integrity without significantly limiting the overall heat resistance of the insertion member.
Solution Approach 2:
The composite structure of binder and fire-resistant particles creates a synergistic effect where the fire-resistant particles provide high-temperature stability that compensates for the binder's lower melting point, maintaining both structural integrity and thermal resistance.
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
This solution effectively delays the propagation of high-temperature gas and heat within the battery pack, increases heat and fire resistance, and enhances the stability and service life of the battery pack.
Implementation Method 1
an insertion member located in the member accommodation space and including fire-resistant particles
Implementation Method 2
the insertion member may further include a binder which binds the fire-resistant particles together
Implementation Method 3
the binder may melt above a predetermined allowable temperature
Data Source
AI summary
The present disclosure relates to a battery pack including a plurality of battery cells, a pack case which accommodates the plurality of battery cells, a partition located inside the pack case and dividing an internal space of the pack case to form a cell accommodation space in which the plurality of battery cells are accommodated, a member accommodation space located adjacent to the cell accommodation space within the pack case, and an insertion member located in the member accommodation space and including fire-resistant particles.