SMA Rupture Sheet Venting for Vibration-Stable Battery Modules
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Solution Overview
Problem
Conventional rupture sheets in battery modules are prone to damage from external vibrations and shocks, leading to unintended vent hole formation and reduced stability, even when not venting gas, due to their thin thickness and notch design.
Innovation Solution
A battery module with a rupture sheet made of shape memory alloy (SMA) that forms venting holes only during gas venting, using a rupture induction member to expand and deform rupture layers, ensuring the sheet remains intact during normal use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the rupture sheet is made thin to enable notch cutting for gas venting, then gas venting function is improved, but the sheet becomes vulnerable to external vibration and shock damage
Solution Approach 1:
The patent changes the material parameter of the rupture sheet from conventional thin metal to shape memory alloy, which enables the sheet to maintain structural integrity during normal vibration while still allowing gas venting when the notches are cut by thermal expansion under high temperature conditions
Solution Approach 2:
The shape memory alloy undergoes phase transition under high temperature conditions, causing the notches to expand and cut through the rupture sheet, enabling gas venting only when necessary while maintaining stability during normal operation
2Object-generated harmful factors
If the rupture sheet has a notch design for gas venting, then gas discharge function is improved, but the sheet is highly likely to be cut by external vibration and shock
Solution Approach 1:
The patent changes the material parameter from conventional metal to shape memory alloy, which provides temperature-responsive notches that remain intact during normal vibration but cut through when thermal expansion occurs under high temperature, enabling controlled gas discharge
Solution Approach 2:
The patent replaces the mechanical notch cutting system with a thermal-responsive system where shape memory alloy notches expand and cut through the rupture sheet in response to high temperature conditions, eliminating the need for mechanical force that could cause premature damage
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 maintains module stability by preventing vent hole formation during normal operation and effectively discharging gas when needed, minimizing exposure and performance deterioration.
Implementation Method 1
the rupture induction member is formed of the shape memory alloy and is suitable to expand to deform and cut the rupture layers
Data Source
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AI summary
A battery module according to one embodiment of the present disclosure includes a battery cell stack in which a plurality of battery cells are stacked; a module frame that houses the battery cell stack; and a rupture sheet formed between the battery cell stack and the module frame, wherein the rupture sheet comprises a shape memory alloy (SMA).