Battery Cell Venting Structure for Hot Gas Energy Dissipation
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Solution Overview
Problem
Existing protective devices for battery cells fail to effectively dissipate the kinetic and thermal energy of hot gases released during faults, leading to potential damage or displacement of neighboring components.
Innovation Solution
A protective device with a hazard receptacle and a protective receptacle, connected by an outgassing channel, features a protective element that moves along a guide from a rest position to a trigger position in response to escaping hot gases, allowing the gases to enter the outgassing channel while preventing damage to neighboring components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the outgassing channel is enlarged to reduce pressure and kinetic energy of hot gases, then the kinetic energy damage is reduced, but the hot gases remain in the channel longer and transfer more thermal energy to neighboring components
Solution Approach 1:
A protective element is introduced as an intermediary component between the hazard receptacle and protective receptacle. This element selectively interacts with hot gases - allowing passage when kinetic energy is high (fault condition) while blocking when kinetic energy is low (normal operation). The protective element absorbs and dissipates kinetic energy through displacement along a guide, preventing direct impact on neighboring components while maintaining thermal energy containment.
Solution Approach 2:
The protective element transitions from a static barrier to a dynamic response system. It moves along a guide from a first position to a second position based on the kinetic energy of incoming hot gases. This dynamic behavior allows the system to adapt its protection level - remaining open during normal operation to allow thermal dissipation, and closing during fault conditions to prevent kinetic energy damage while still channeling gases safely.
2Productivity
If battery cells are densely packed to increase productivity, then space utilization is improved, but neighboring components become more vulnerable to kinetic and thermal energy damage
Solution Approach 1:
The protective element acts as a mediator between densely packed battery cells. It provides on-demand protection specifically when needed (during fault conditions with high kinetic energy gases) while maintaining close packing during normal operation. The protective element's selective blocking action allows dense packing without permanently compromising safety, as it only activates when hot gases are actually present and dangerous.
Solution Approach 2:
The protective device is self-activating based on the kinetic energy of hot gases themselves. No external sensors or control systems are needed - the hot gases directly drive the protective element along the guide when their kinetic energy exceeds the retention force. This self-service mechanism enables dense packing without adding complex control systems that would increase space requirements.
3Object-affected harmful factors
If a protective element is used to block hot gases, then kinetic energy damage is prevented, but the protective element must be displaced to allow gas entry into the outgassing channel
Solution Approach 1:
The protective element is displaced purely by the kinetic energy of hot gases acting directly on it. The gases themselves provide the force to move the protective element along the guide from the first position to the second position. This eliminates the need for external actuators, sensors, or control systems, keeping the device simple despite its dynamic protection capability.
Solution Approach 2:
The protective element utilizes pneumatic pressure from hot gases to drive its displacement mechanism. The kinetic energy of the gas flow directly pushes the protective element along the guide, converting thermal/kinetic energy into mechanical displacement. This pneumatic actuation is simpler than electrical or mechanical actuation systems and requires no additional power sources or control electronics.
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 dissipates the kinetic and thermal energy of hot gases, preventing damage to neighboring components by channeling the gases away from sensitive areas and absorbing kinetic energy through the displacement of the protective element.
Implementation Method 1
the outgassing hot gases and/or electrically conductive particles transfer their kinetic energy at least partially in the form of an elastic impact to the protective element, which thereby shifts along the guide in the direction of the protective receptacle
Implementation Method 2
an outgassing channel extending transversely to the main direction is provided between the hazard receptacle and the protective receptacle for discharging hot gas
Data Source
AI summary
A protective device for battery cells, comprises a hazard receptacle (1) for the outgassing region (2) of a battery cell (3) and a protective receptacle (5) located opposite the hazard receptacle (1) in a main direction (4). An outgassing channel (6) extending transversely to the main direction (4) for discharging hot gas is provided between the hazard receptacle (1) and the protective receptacle (5). The hot gases from a battery cell are vented in the event of a malfunction so that damage to or displacement of the components by the kinetic and thermal energy of the hot gases is avoided as much as possible. A protective element (7), which in a rest position covers the hazard receptacle (1), can be displaced by escaping hot gas along a guide into a trigger position covering the protective receptacle (5).