Battery Cell Sealing Coating to Slow Heat and Fire Propagation
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Solution Overview
Problem
Secondary batteries generate significant heat during charging and discharging, which can lead to heat or fire propagation, causing damage to neighboring cells.
Innovation Solution
A battery assembly with fire-resistant material coating on the outer body of at least one battery cell, particularly the sealing portion, to retard heat and fire propagation, using materials like polyurethane, silica, or ceramic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fire-resistant material is coated on the outer body of battery cells, then heat and fire propagation is retarded, but device complexity and manufacturing complexity increase
Solution Approach 1:
The fire-resistant material is selectively coated only on the sealing portion of the outer body, not the entire surface. This localized application provides fire protection where it is most needed (at the sealing interface between cells) while minimizing the amount of additional material and complexity introduced to the battery assembly structure.
2Reliability
If fire-resistant material is coated on the outer body of battery cells, then heat and fire propagation is retarded, but manufacturing complexity increases
Solution Approach 1:
The coating process is applied selectively to the sealing portion rather than the entire outer body, which simplifies the manufacturing process by reducing the surface area that requires treatment and allowing for more targeted, efficient application methods.
Solution Approach 2:
The fire-resistant material is coated on the sealing portion during the battery assembly manufacturing process, before the cells are stacked and assembled into the final battery pack. This preliminary coating integrates the safety feature into the manufacturing workflow without requiring separate post-assembly treatment steps.
3Reliability
If fire-resistant material is used, then heat propagation is delayed, but weight of the battery assembly increases
Solution Approach 1:
The fire-resistant material is applied only to the sealing portion of the outer body, which is a relatively small surface area compared to coating the entire cell. This localized approach provides the necessary fire protection while minimizing the total amount of additional material and associated weight increase.
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 fire-resistant coating delays the spread of heat or fire within the battery assembly, enhancing safety and preventing damage.
Implementation Method 1
a portion of the outer body of at least one battery cell among the plurality of battery cells may be coated with a fire-resistant material
Implementation Method 2
the fire-resistant material may be foamed at or above a preset temperature
Data Source
AI summary
The present disclosure relates to a battery assembly comprising a plurality of battery cells stacked along a direction; and a housing accommodating the plurality of battery cells; wherein each of the plurality of battery cells may include an electrode assembly, an outer body accommodating the electrode assembly, and a tab portion protruding outwardly from the outer body, and wherein a portion of the outer body of at least one battery cell among the plurality of battery cells may be coated with a fire-resistant material.