Battery Module Vent Film Cooling for Flame Suppression
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Solution Overview
Problem
Existing battery modules fail to effectively suppress flames and prevent chain ignition when a battery cell ignites, as the vent part is blocked by the heatsink, leading to increased internal pressure and lateral ejection of flames.
Innovation Solution
A battery module design featuring a heat dissipation film attached to the vent part, which tears upon ignition, allowing cooling water to flow through the damaged portion and suppress flames by cooling the ignited cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heatsink is attached to the vent part side of the battery cell, then heat dissipation is improved, but the vent part is blocked and cannot open upon ignition
Solution Approach 1:
The heat dissipation component is divided into two distinct parts: a heat dissipation film that contacts the vent part and can be torn away, and a heat dissipation case that provides cooling. This segmentation allows the vent part to open by tearing the film while the heat dissipation case remains in place to provide continuous cooling.
Solution Approach 2:
The heat dissipation film is designed as a separate, removable layer that is taken out from the main heat dissipation structure. This extracted film serves as a sacrificial element that can be torn away to open the vent without interfering with the permanent heat dissipation case.
2Device complexity
If the vent part is blocked, then heat dissipation structure is simplified, but internal pressure increases and causes lateral flame ejection
Solution Approach 1:
The heat dissipation film is pre-positioned over the vent part in a controlled manner. This preliminary arrangement ensures that when ignition occurs, the film can be torn away in a predictable way to open the vent, preventing uncontrolled lateral flame ejection while maintaining structural simplicity.
Solution Approach 2:
The heat dissipation film acts as an intermediary element between the vent part and the external environment. It provides a controlled opening mechanism that mediates between the need to maintain structural integrity and the need to allow safe pressure release.
3Object-affected harmful factors
If a tearable heat dissipation film is introduced, then flame suppression is improved, but device complexity increases
Solution Approach 1:
The heat dissipation film is merged with the heat dissipation case to form an integrated heat dissipation part. This combination allows the tearable film feature to be added without requiring a completely separate system, thereby limiting the increase in overall device complexity.
Solution Approach 2:
The heat dissipation film serves multiple functions: it acts as a protective cover during normal operation, a controlled opening mechanism during ignition, and a component that can be torn to allow cooling water flow. This multi-functionality reduces the need for additional separate components.
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 design prevents flame spread and temperature increase by allowing early suppression of ignited cells, thereby securing safety and preventing chain ignition.
Implementation Method 1
cooling water flows down to the battery cell through the damaged portion of the heat dissipation film
Implementation Method 2
a heat dissipation film, one side of which is attached to the battery cell to face the vent part of the battery cell
Data Source
Figure 1~2
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AI summary
A battery module according to one example of the present invention comprises at least one battery cell having a vent part, and a heat dissipation part disposed to face the vent part of the at least one battery cell and dissipating heat from the battery cell, wherein the heat dissipation part comprises a heat dissipation film, one side of which is attached to the battery cell to face the vent part of the battery cell, and a heat dissipation case coupled to the other side opposite to one side of the heat dissipation film to form a cooling flow passage.