Battery Pack Case Venting Through Pressure-Driven Lid Displacement
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Solution Overview
Problem
Existing battery pack gas exhaust mechanisms are complex and costly, making it difficult to safely and smoothly exhaust gas when internal pressure increases due to abnormalities, and they are not easily downsized.
Innovation Solution
A battery pack design where the case body and case lid are configured to relative displacement when internal pressure increases, forming a gas exhaust opening while maintaining their coupling, utilizing a slide part with exhaust holes to efficiently vent gas without additional dedicated components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas exhaust mechanism with dedicated components is used, then gas can be exhausted when internal pressure increases, but the structure becomes complicated and costs increase
Solution Approach 1:
The gas exhaust function is merged into the case structure itself. The case body and case lid are designed with engagement protrusions and recesses that normally maintain sealing, but automatically separate when internal pressure increases to form exhaust openings. This eliminates the need for dedicated exhaust valves or mechanisms while maintaining both structural integrity and gas exhaust capability.
Solution Approach 2:
The case structure serves dual functions: it provides structural support and sealing during normal operation, and automatically becomes a gas exhaust path when internal pressure increases. The engagement protrusions and recesses self-actuate based on pressure changes without requiring external control mechanisms, making the system self-regulating and eliminating complex control components.
2Reliability
If a gas exhaust mechanism with dedicated components is used, then gas can be exhausted when internal pressure increases, but manufacturing costs increase
Solution Approach 1:
The gas exhaust function is integrated into the existing case body and case lid structures. The engagement protrusions and recesses are formed as part of the molding process for these components, eliminating the need for separate exhaust mechanism parts. This reduces component count, simplifies assembly, and lowers manufacturing costs while ensuring reliable gas exhaust capability.
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 allows for safe and smooth gas exhaust during abnormalities, preventing damage to the battery pack while simplifying the structure and reducing costs, and enabling downsizing without the need for extra components.
Implementation Method 1
when an internal pressure increases due to generation of gas, the case body and the case lid are relatively displaced in directions away from each other and a gas exhaust opening is formed
Data Source
AI summary
Battery pack (10) as an example of an exemplary embodiment includes: a plurality of batteries (50); and case (60) including case body (20) housing the plurality of batteries (50) and case lid (30) covering opening (22) of case body (20). Case (60) is configured such that when the internal pressure increases due to generation of gas, case body (20) and case lid (30) are relatively displaced in directions away from each other and a gas exhaust opening is formed in a state that a coupling between case body (20) and case lid (30) is maintained.