Battery Cell Venting Structure for Thermal Runaway Containment
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Solution Overview
Problem
In multi-cell battery packs, the close proximity of cells increases the risk of thermal runaway, where a cell's hot gases and materials can damage adjacent cells, potentially causing a cascading failure.
Innovation Solution
A venting system is implemented, comprising a venting material proximate to each cell and a venting device with a structure surrounding each cell. This system allows ejected materials from a thermal event to flow through the venting material and be directed away from the cell via a defined venting path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cells are packed in close proximity to achieve high energy density, then energy density is improved, but the risk of thermal runaway spreading to adjacent cells increases
Solution Approach 1:
The battery pack is divided into individual cell compartments with separate venting paths. Each cell has its own venting structure that isolates it from adjacent cells, preventing the propagation of thermal runaway while maintaining close proximity for high energy density.
Solution Approach 2:
A venting material is introduced as an intermediary component between cells. This material allows gases to pass through during normal operation but can block or redirect thermal runaway events, serving as a protective barrier that maintains both high density and safety.
2Object-affected harmful factors
If a venting system is added to direct ejected materials away from cells, then protection from thermal runaway damage is improved, but device complexity increases
Solution Approach 1:
The venting structure is merged with the cell housing or pack structure itself, rather than being a separate additional component. The housing walls serve dual purposes: containing the cell and providing the venting path structure, thereby reducing overall complexity.
Solution Approach 2:
The venting paths and structural walls serve multiple functions: they provide mechanical containment for cells, guide normal venting gases safely, and block or redirect thermal runaway propagation. This multi-functionality reduces the need for separate protective 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 venting system effectively diverts ejected materials away from cells, preventing damage and reducing the risk of cascading failures, while maintaining high energy density in the battery pack.
Implementation Method 1
if a cell emits hot gases and materials (e.g., due to internal short, thermal runaway or other event)
Data Source
AI summary
A venting system for a battery includes a venting material disposed proximate to each cell of a plurality of electrochemical cells of the battery, the venting material configured to allow materials ejected due to a thermal event to flow through the venting material. The system also includes a venting device disposed in a fixed position relative to the venting material and the plurality of cells, the venting device including a structure for each cell. The structure includes a wall surrounding an area corresponding to a respective cell and extending away from the respective cell, the wall defining a venting path configured to direct ejected materials away from the respective cell.