Battery Module Insulating Sheet with Cut Lines for Fire Spread Delay
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Solution Overview
Problem
In battery modules, abnormal phenomena such as high temperature, gas generation, and sparking can rapidly spread between densely packed battery cells, leading to severe fire accidents due to the lack of effective insulation and containment mechanisms.
Innovation Solution
A battery module design incorporating an insulating sheet with cut lines and through-holes, along with sidewalls featuring separation slits, is used to suppress the spread of abnormal phenomena by allowing selective separation and maintaining coverage of unaffected cells, thereby delaying fire and explosion propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple battery cells are densely packed to enhance output and capacity, then productivity and energy density are improved, but the spread of abnormal phenomena (high temperature, gas, sparks) between cells increases
Solution Approach 1:
The insulating sheet is divided into multiple independent insulating pieces separated by cut lines. Each insulating piece covers individual battery cells or groups of cells, creating physical segmentation between adjacent cells. This segmentation prevents the spread of abnormal phenomena while maintaining dense packing arrangement of cells for high productivity.
Solution Approach 2:
The insulating sheet acts as an intermediary barrier between adjacent battery cells. The insulating pieces are positioned between cells to mediate thermal and electrical interactions, blocking the transmission of high temperature, gas, and sparks while allowing the cells to remain densely packed for enhanced output.
2Reliability
If an insulating sheet completely covers all battery cells to prevent spread of abnormal phenomena, then safety is improved, but accessibility to terminals and vents is reduced
Solution Approach 1:
The insulating sheet is segmented into multiple independent pieces with cut lines between them. This segmentation allows specific regions to be opened or removed to access terminals and vents while maintaining insulation coverage on other regions, thus preserving safety without compromising accessibility.
Solution Approach 2:
Different regions of the insulating sheet have different properties: some areas have insulating pieces for safety, while other areas have openings or removed sections for accessibility. This local differentiation allows the insulating sheet to simultaneously provide safety coverage and operational access to terminals and vents.
3Reliability
If the insulating sheet is made as a single continuous piece to maximize insulation coverage, then safety is improved, but adaptability to different cell configurations is reduced
Solution Approach 1:
The insulating sheet is divided into multiple independent insulating pieces that can be separately positioned and configured. This segmentation allows the pieces to be arranged in different patterns to match various battery cell configurations while collectively providing comprehensive insulation coverage through their combined arrangement.
Solution Approach 2:
The insulating pieces are designed to be movable and reconfigurable rather than fixed in a single rigid arrangement. This dynamic characteristic allows the insulating pieces to be repositioned and rearranged to adapt to different battery cell configurations while maintaining effective insulation coverage.
Data Source
AI summary
A battery module includes: multiple battery cells arranged in a first direction; and an insulating sheet made of an insulating material and including a middle portion covering a first surface of the multiple battery cells, the middle portion including at least one cut line extending in a second direction.