Lithium-Ion Battery Venting Cover for Thermal Runaway Mitigation
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Solution Overview
Problem
Lithium-ion rechargeable battery systems face challenges in mitigating thermal runaway and fire propagation due to their intrinsic instability, which is difficult to address in constrained spaces like electric vehicles without increasing cost and volume.
Innovation Solution
A battery system with a thermal barrier and a protective cover featuring guide apertures aligned with cell vents to direct emissions away from surrounding cells, effectively absorbing heat energy and preventing fire propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical protection, liquid immersion, or built-in extinguishers are used to prevent fire propagation, then safety is improved, but cost and volume increase
Solution Approach 1:
The battery pack is divided into individual cell compartments with separate vents for each cell. Each vent independently directs emissions from its corresponding cell, creating segmented protection zones that prevent fire propagation without requiring a monolithic protective structure around the entire battery pack.
Solution Approach 2:
A thermal barrier material is introduced as an intermediary substance between the battery cells and the external environment. This thermal barrier absorbs heat energy from emissions and redirects them through guide apertures, mediating the thermal interaction between cells and preventing fire propagation without requiring large physical separation distances.
2Reliability
If thermal barriers and guide apertures are added to each cell vent, then fire propagation is prevented, but device complexity increases
Solution Approach 1:
The vent structure serves multiple functions simultaneously: it acts as a pressure relief valve, a thermal management pathway, and a fire propagation barrier. The guide aperture both directs emissions and provides structural support, while the thermal barrier both absorbs heat and protects surrounding cells, reducing the need for separate dedicated components for each function.
Solution Approach 2:
The vent, guide aperture, and thermal barrier are combined into an integrated protective structure for each battery cell. Rather than having separate components for pressure relief, heat management, and fire prevention, these functions are merged into a single unified structure that reduces overall system complexity while maintaining all necessary protective capabilities.
3Reliability
If conventional fire protection methods are implemented, then safety is improved, but manufacturing cost increases
Solution Approach 1:
A porous thermal barrier material is used that provides effective heat absorption and emission guidance while being cost-effective and easy to manufacture. The porous structure increases surface area for heat absorption without requiring thick solid barriers, reducing material costs while maintaining protective effectiveness.
Solution Approach 2:
The design changes the thermal parameters of the battery pack by introducing materials and structures with specific thermal properties (heat absorption capacity, thermal conductivity) rather than relying on mechanical barriers or chemical extinguishing agents. This parameter-based approach allows for cost-effective selection of materials that provide fire protection through thermal management rather than expensive active safety systems.
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 prevents and mitigates fire propagation from thermal runaway in lithium-ion battery systems, allowing for the use of these batteries in constrained spaces while maintaining safety and reducing the risk of thermal damage to surrounding cells.
Implementation Method 1
the thermal barrier is configured to absorb heat energy generated by the emissions
Data Source
AI summary
A battery system includes a cover including a plurality of guide apertures. The battery system also includes a thermal barrier disposed adjacent the plurality of guide apertures of the cover. Each one of the plurality of guide apertures is configured to guide emissions through the cover, and the thermal barrier is configured to absorb heat energy generated by the emissions. The battery system may further include a plurality of battery cells, and the thermal barrier may be disposed between the plurality of battery cells and the cover. Each one of the plurality of battery cells may include a vent configured to release the emissions. Each of the plurality of guide apertures of the cover may be aligned with the vent of one of the plurality of battery cells to guide emissions released by the vent through the cover.