Bus Bar Flame-Retardant Sheet for Battery Fire Containment
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Solution Overview
Problem
Conventional battery modules face the risk of secondary ignition or explosion, with heat or flame from an initial ignition potentially spreading to adjacent batteries, necessitating a solution to prevent fire spread and oxygen supply.
Innovation Solution
A battery module design incorporating a flame-retardant sheet that covers perforated holes in bus bar assemblies, with ridged and protruding features to block air entry and a pressing pin to manage high-pressure gas discharge, enhancing durability and preventing fire spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bus bar assembly has perforated holes for electrode lead passage, then electrical connectivity and assembly simplicity are improved, but oxygen can supply to ignited batteries causing fire spread
Solution Approach 1:
A flame-retardant sheet is introduced as an intermediary component between the perforated holes of the bus bar assembly and the battery cells. This sheet blocks oxygen supply through the holes while maintaining electrical connectivity, preventing fire spread to adjacent batteries without compromising the assembly simplicity provided by the perforated structure
Solution Approach 2:
The flame-retardant sheet is selectively positioned only at the perforated holes where oxygen supply needs to be blocked, while maintaining open structure elsewhere for electrical connectivity. This localized application prevents fire spread at critical points without affecting overall assembly simplicity
2Object-affected harmful factors
If flame-retardant sheet is added to block oxygen supply, then fire spread prevention is improved, but device complexity increases
Solution Approach 1:
A thin flame-retardant sheet is used instead of complex rigid structures to block oxygen supply. The sheet can be easily installed in the perforated holes and provides effective fire prevention without significantly increasing device complexity, maintaining assembly simplicity while improving safety
Solution Approach 2:
The flame-retardant sheet is a simple, inexpensive component that can be easily replaced if needed. Its low cost and simple structure mean that adding it to block oxygen supply does not significantly increase overall device complexity or maintenance burden
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 flame-retardant sheet effectively blocks oxygen supply and contains thermal runaway, increasing the module's durability and preventing fires from spreading to adjacent cells.
Implementation Method 1
a flame-retardant sheet having a plate shape and located in contact with an outer side of the at least one bus bar to close the plurality of perforated holes
Implementation Method 2
a pressing pin configured to press a portion of the flame-retardant sheet facing the insert hole of the at least one bus bar
Data Source
AI summary
A battery module includes at least one cell assembly including a plurality of secondary batteries, each of which has an electrode lead, a module housing having an inner space formed to accommodate the cell assembly therein, a bus bar assembly including at least one electrically conductive bus bar having a plate shape and configured to contact a portion of the electrode lead, and at least one electrically insulating bus bar frame to which the at least one bus bar is mounted, the at least one bus bar frame having a plurality of perforated holes through which the electrode leads of the plurality of secondary batteries passes and a flame-retardant sheet having a plate shape and located in close contact with an outer side of the bus bar to close the perforated hole.