Cell Tab Rupture Valve for Controlled Pouch Cell Degassing
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Solution Overview
Problem
Pouch cells lack a mechanism for targeted degassing, leading to potential thermal runaway due to built-up gas, as they do not have a rigid outer housing, making it difficult to predict and manage pressure relief.
Innovation Solution
A cell tab with an integrated rupture valve is introduced, featuring a base body with internal and external parts, a sealing region, and a rupture disc that allows controlled gas release through an internal channel, enabling precise spatial and temporal degassing without additional lines or breakthroughs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If pouch cells use a flexible sealing seam design for light weight and slender construction, then volumetric energy density is improved, but the ability to enable targeted degassing deteriorates
Solution Approach 1:
The invention merges the cell tab structure with a rupture valve function by integrating a rupture disc into the tab. This combination allows the tab to serve dual purposes: electrical connection and controlled pressure relief, enabling targeted degassing without adding separate components that would compromise the pouch cell's volumetric energy density.
Solution Approach 2:
The rupture disc acts as an intermediary element within the cell tab structure. It mediates between the internal gas pressure and the external environment, providing a controlled release mechanism that maintains the flexibility of the sealing seam while enabling precise spatial and temporal degassing control.
2Device complexity
If pouch cells rely on the sealing seam as the only pressure relief point, then device simplicity is maintained, but reliability deteriorates due to unpredictable rupture points
Solution Approach 1:
The invention extracts the pressure relief function from the sealing seam and relocates it to the cell tab via an integrated rupture disc. This separation allows the sealing seam to maintain its structural integrity while the tab provides a predictable, controllable pressure relief point, significantly improving reliability without adding complex external components.
Solution Approach 2:
The rupture disc is pre-installed in the cell tab at a specific location with predetermined rupture characteristics. This preliminary preparation ensures that when pressure builds up, gas is released at a known, controlled point rather than unpredictably at any weak point in the sealing seam, enhancing both reliability and safety.
3Ease of manufacture
If no degassing mechanism is provided in pouch cells, then manufacturing simplicity is maintained, but harmful factors increase due to gas buildup and thermal runaway risk
Solution Approach 1:
The invention combines the electrical tab with a rupture valve function, allowing the degassing mechanism to be manufactured as an integrated component during the tab production process. This approach maintains manufacturing simplicity while effectively preventing gas buildup and thermal runaway through controlled pressure relief.
Solution Approach 2:
The cell tab with integrated rupture disc serves itself by providing both electrical connection and pressure relief functions. The rupture disc automatically activates when pressure reaches a critical level, enabling the cell to self-regulate without external intervention, thus preventing harmful gas buildup while maintaining ease of manufacture.
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 manages gas release from pouch cells, preventing thermal runaway by allowing controlled pressure relief and detecting excessive pressure through a sensor unit, ensuring safety and maintaining structural integrity.
Implementation Method 1
Through a targeted choice of the rupture disc, which covers the externally leading opening of the inner channel, a degassing of the battery cell can be carried out that can be precisely defined spatially and in time.
Implementation Method 2
detecting excessive pressure through a sensor unit, ensuring safety and maintaining structural integrity
Data Source
AI summary
A cell tab with an integrated rupture valve for a battery cell. The cell tab includes a base body having a first part and a second part. A plastic material is arranged on the surface of the base body between the first part and the second part. A first opening is arranged on the first part, and a second opening is arranged on the second part. An inner channel extends between the first opening and the second opening in the interior of the base body. A rupture disc is arranged on the second opening is gas-tight and thus provides a rupture valve.