Battery Module Flame Blocking Member for Thermal Runaway Isolation
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Solution Overview
Problem
Lithium secondary batteries used in large devices face safety issues due to thermal runaway, which can lead to flame or high-temperature gas ejection, potentially causing secondary explosions when multiple batteries are connected in series or parallel.
Innovation Solution
A battery module and pack design incorporating a flame blocking member with corrugated sheet members, irregular holes, and a partition wall, which extends in a specific direction to dissipate thermal energy and prevent flame or high-temperature gas from being ejected outside, using materials with high thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple secondary batteries are electrically connected in series or parallel to increase capacity and output, then the energy storage capacity and power output are improved, but the risk of thermal runaway propagation and secondary explosions increases
Solution Approach 1:
The battery pack is divided into multiple independent battery modules, each surrounded by its own case structure. This segmentation isolates thermal runaway events to individual modules, preventing propagation to other modules while maintaining high capacity through parallel/series connection of multiple modules.
Solution Approach 2:
A flame blocking member is introduced as an intermediary component between battery modules. This member includes exhaust passages that allow controlled gas release while the partition wall portion blocks flame propagation, serving as a mediator that manages thermal runaway effects without compromising the electrical connectivity needed for high power output.
2Reliability
If a flame blocking member with partition wall is introduced to prevent flame propagation, then the safety against thermal runaway propagation is improved, but the device complexity increases
Solution Approach 1:
The flame blocking member is designed to perform multiple functions: it provides flame blocking through its partition wall, allows controlled venting through exhaust passages, and serves as a structural support element within the battery module. This multi-functionality reduces the need for additional separate safety components, thereby limiting complexity increase.
Solution Approach 2:
The flame blocking member is nested within the existing battery module case structure, with exhaust passages integrated into the partition wall. This nested design allows the safety component to be incorporated without adding significant external complexity to the overall battery pack architecture.
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 solution effectively minimizes the risk of flame or high-temperature gas ejection, preventing the transfer of fire to adjacent battery modules and reducing the risk of secondary explosions within battery packs.
Implementation Method 1
using materials with high thermal conductivity
Data Source
AI summary
Provided is a battery module including a case, a plurality of battery cells accommodated in the case, and a flame blocking member including a plurality of exhaust passages connecting an inside and an outside of the case together, and a partition wall part disposed between the plurality of exhaust passages.