Battery Pack Venting Structure for Controlled Gas and Flame Release
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Solution Overview
Problem
Secondary batteries can explode due to internal defects, causing rapid pressure increase and unintentional discharge of toxic gas and flame, posing risks of casualties and property damage.
Innovation Solution
A battery pack design featuring a housing with a switching part that elastically deforms to adjust communication between the accommodation space and external space, using communication and sealing grooves to discharge internal gases and flames safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery pack is made sealed to prevent gas and flame discharge, then safety is improved, but pressure buildup from internal defects cannot be relieved
Solution Approach 1:
The switching part acts as an intermediary element between the sealed accommodation space and the external environment. It remains closed under normal conditions to maintain sealing, but opens automatically when internal pressure exceeds external pressure, allowing gas and flame to escape through the communication passage while preventing normal leakage.
Solution Approach 2:
The switching part utilizes the pressure difference between internal and external environments to automatically open or close the communication passage without external control. When internal pressure exceeds external pressure, the switching part is pushed open by the pressure differential itself, enabling self-regulating pressure relief.
2Strength
If the battery pack structure is made rigid to maintain integrity, then structural strength is improved, but deformability under internal pressure is reduced
Solution Approach 1:
The switching part is segmented into a fixed portion attached to the housing and a movable portion that can deform elastically. This segmentation allows the majority of the housing to remain rigid for structural integrity, while the segmented switching part provides the necessary deformability to respond to pressure changes by opening or closing the communication passage.
Solution Approach 2:
The movable portion of the switching part is made from an elastic material that can deform under pressure. This flexible component allows the otherwise rigid housing to adapt to internal pressure changes by enabling the switching part to bend and open the communication passage when needed, while maintaining overall structural integrity.
3Object-generated harmful factors
If the communication passage is kept open to allow gas discharge, then pressure relief is improved, but unintentional discharge of toxic gas and flame occurs during normal operation
Solution Approach 1:
The switching part transitions from a static open or closed state to a dynamic structure that can change its configuration based on pressure conditions. The movable portion can elastically deform to open the communication passage when internal pressure exceeds external pressure, and return to a closed position when pressure equalizes, enabling conditional gas discharge rather than continuous or unintentional discharge.
Solution Approach 2:
The switching part automatically detects pressure differential conditions and self-regulates the communication passage state without external control. When internal pressure exceeds external pressure, the pressure differential itself pushes the movable portion to open the passage; when pressures equalize, the elastic material naturally returns to its original closed configuration, preventing unintentional discharge during normal operation.
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 design effectively prevents explosions and unintended discharge of gases and flames by allowing controlled release of internal materials, reducing risks of casualties and property damage.
Implementation Method 1
a switching part, which is mounted on the housing and elastically deformed according to pressure of the accommodation space to adjust communication between the accommodation space and an external space of the housing
Data Source
AI summary
A battery pack according to an embodiment of the present invention may include a housing, in which an accommodation space in which a secondary battery is accommodated is defined, and a switching part, which is mounted on the housing and elastically deformed according to pressure of the accommodation space to adjust communication between the accommodation space and an external space of the housing, so that the battery pack is deformed according to internal pressure to discharge an internal material such as internal gas and flame. The battery pack may prevent a phenomenon, in which the battery pack is exploded or toxic gas and flame is discharged unintentionally, to prevent resultant casualties and damage to property in advance.