Battery Cell Venting Housing With Localized Gas Shielding
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Solution Overview
Problem
In electrical energy storage systems, a short circuit in one storage cell can lead to an exothermic reaction, causing hot gas with particles to be conducted into the installation space, potentially heating and risking other cells and causing increased short-circuit risks due to gas passing through air gaps and conductive particles.
Innovation Solution
A housing part with a degassing channel and shielding device is designed to direct gas from an affected storage cell into a degassing valve while preventing it from reaching adjacent cells, using a shielding plate and pot-shaped coverings to create a locally limited opening for gas exit and maintain fluid-tight sealing around other cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas is vented through air gaps between storage cells, then degassing is achieved, but adjacent storage cells are heated and short-circuit risk increases
Solution Approach 1:
The housing is divided into multiple sealed compartments, each surrounding individual storage cells. These compartments are fluid-tightly separated by partition walls, preventing gas from one compartment from reaching adjacent storage cells. This segmentation isolates the harmful gas flow to only the compartment containing the venting cell.
Solution Approach 2:
Partition walls serve as intermediary barriers between compartments. These walls include controlled openings with closure elements that normally remain closed to block gas flow, but can be opened to allow controlled gas passage when needed. The partition walls mediate between the need for gas venting and the need to protect adjacent cells.
2Quantity of substance
If storage cells are tightly packed to maximize energy density, then space utilization improves, but gas can still pass between cells through air gaps
Solution Approach 1:
The housing interior is segmented into multiple compartments by partition walls, creating separate sealed spaces around groups of storage cells. This segmentation allows tight packing of cells within each compartment while preventing gas from spreading to other compartments, thus maintaining both high cell density and gas isolation.
Solution Approach 2:
The partition walls act as thin film barriers that fluid-tightly separate compartments. These walls include controlled openings that can be sealed by closure elements, providing flexible control over gas flow while maintaining the integrity of the separation between tightly packed cell groups.
3Reliability
If a shielding device is introduced to prevent gas from reaching adjacent cells, then safety improves, but device complexity increases
Solution Approach 1:
The partition walls with controlled openings are integrated directly into the housing structure itself, combining the functions of housing, compartmentation, and controlled gas flow management into a single unified structure. This merging eliminates the need for separate shielding devices and reduces overall system complexity.
Solution Approach 2:
The partition walls serve multiple functions simultaneously: they structurally support the housing, fluid-tightly separate compartments, and provide controlled openings for gas flow management. This multi-functionality reduces the need for additional dedicated shielding components, simplifying the overall device structure.
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
This configuration ensures safe and efficient degassing of the affected cell without overheating or short-circuiting adjacent cells, enhancing the overall safety and reliability of the energy storage system by isolating gas and particles effectively.
Implementation Method 1
The individual compartments are separated from one another by partition walls in such a manner that the compartments are fluid-tightly separated from one another
Data Source
AI summary
A housing part for an electrical energy store which has a plurality of storage cells disposed next to each other in such a way that gas venting valves of the plurality of storage cells are located on a common side includes a gas venting channel, which is designed to conduct gas to a gas venting valve of the energy store. The housing part also includes a shielding device, which is designed to cover the common side of the plurality of storage cells and thus to shield the common side of the plurality of storage cells from gas in the gas venting channel. The shielding device is also designed such that gas which exits through the gas venting valve of a first storage cell of the plurality of storage cells causes a locally limited opening in the shielding device, through which the gas from the first storage cell can pass into the gas venting channel. The shielding device is designed such that the one or more other storage cells of the plurality of storage cells are shielded from the gas from the first storage cell by the shielding device even when the locally limited opening is present.