Battery Degassing Channel Layout to Cool Vent Gases
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Solution Overview
Problem
In electrically driven motor vehicles, the mixing of hot gases from the electrical energy reservoir with air can lead to ignition, causing potential fires, and particles released from battery cells can further promote this ignition, posing a risk to the vehicle and surrounding objects.
Innovation Solution
A degassing device with a meandering degassing channel design that extends the path of exiting gases, allowing for enhanced cooling and trapping of particles within receiving pockets, integrated into the underride protection plate, which forms the channel walls, reducing the risk of ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a straight degassing channel is used, then the device complexity is low, but the hot gases exit quickly without sufficient cooling, increasing ignition risk
Solution Approach 1:
The patent applies curvature by designing the degassing channel with a meandering path instead of a straight line. The channel includes multiple bends and curves that extend its length within the limited space of the battery housing. This curved path increases the residence time of hot gases in the channel, allowing more effective cooling before exit, thereby reducing ignition risk while maintaining a relatively simple overall device structure.
2Temperature
If the degassing channel is extended with meandering path, then the cooling effect is enhanced, but the channel occupies more space within the housing
Solution Approach 1:
The patent implements nesting by routing the degassing channel through the wall structure of the battery housing itself. The channel is integrated into the housing walls rather than occupying separate internal space. This allows the channel to follow a meandering path along the housing perimeter, extending its length for improved cooling while utilizing the existing housing volume efficiently without requiring additional dedicated space.
3Reliability
If particles are allowed to exit with hot gases, then the degassing function is simple, but particles promote ignition of the gases
Solution Approach 1:
The patent applies extraction by incorporating a particle trap section within the degassing channel that separates and removes particles from the hot gas flow before exit. The channel design includes a widened section or dead end where particles can settle and be trapped, while the cooled gas continues to exit. This extracts the harmful particles from the gas stream, preventing them from promoting ignition of the discharged gases.
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 meandering channel design and integrated particle trapping mechanism significantly reduce the flammability and ignitability of exiting gases, minimizing the risk of ignition and enhancing safety by ensuring gases are cooled and particles are filtered out before reaching the external environment.
Implementation Method 1
the at least one degassing channel is significantly extended within the degassing device compared to a straight path, so that the hot gases remain in the degassing channel longer and are cooled more strongly before exiting to the external environment
Implementation Method 2
the channel deflections also present obstacles to exiting particles that can be stopped at the channel deflections and optionally also collected there
Data Source
AI summary
A motor vehicle has an electric drive unit, an electrical energy reservoir, and a degassing device. The electrical energy reservoir includes a housing having an internal space and having at least one battery cell arranged therein. The degassing device includes at least one degassing channel, which is fluidly connected to the internal space of the electrical energy reservoir and to the external environment. The at least one degassing channel is formed by channel walls defining the path of the degassing channel. The channel walls are configured such the degassing channel has a meandering path formed due to a plurality of channel deflections.