Battery Case Aluminum Alloy Plate for Thermal Runaway Strength
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Solution Overview
Problem
Secondary batteries face risks of thermal runaway due to pressure and temperature increases during charging and discharging, leading to potential housing damage and fire, necessitating a high-strength aluminum alloy plate that maintains integrity under high temperatures and pressures.
Innovation Solution
An aluminum alloy plate with specific compositions of manganese (1.25-1.5 wt%) and magnesium (0.6-0.8 wt%) is developed, along with a manufacturing process involving melting, casting, solution treating, and rolling, ensuring high strength, formability, and weldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional aluminum alloys are used for battery case, then ease of manufacture is maintained, but strength at high temperature deteriorates leading to housing damage during thermal runaway
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters of the aluminum alloy, specifically setting Mn content at 1.0-1.5 wt% and Mg content at 0.5-1.0 wt%, to achieve optimal high-temperature strength while maintaining manufacturability through standard manufacturing processes
Solution Approach 2:
The patent creates a composite aluminum alloy material combining multiple elements (Al-Mn-Mg system) to achieve superior high-temperature strength properties that cannot be obtained with conventional single-element or simple aluminum alloys, while still using conventional manufacturing methods
2Reliability
If high-strength aluminum alloy is used to prevent housing damage, then reliability during thermal runaway is improved, but formability and weldability deteriorate
Solution Approach 1:
The patent optimizes the compositional parameters within specific ranges (Mn: 1.0-1.5 wt%, Mg: 0.5-1.0 wt%) to achieve a balance where the alloy maintains high reliability for safety vent rupture while preserving adequate formability and weldability for manufacturing operations
Solution Approach 2:
The patent achieves local quality by providing different property optimizations in different aspects: the alloy composition is specifically tailored to deliver high strength and reliability for safety vent rupture performance, while maintaining sufficient ductility and weldability for manufacturing processes
3Strength
If aluminum alloy composition is optimized for high-temperature strength, then thermal runaway safety is improved, but manufacturing precision deteriorates due to difficulty in controlling composition
Solution Approach 1:
The patent defines specific compositional parameter ranges (Mn: 1.0-1.5 wt%, Mg: 0.5-1.0 wt%) that are practical to control during manufacturing, achieving high-temperature strength without requiring extremely tight composition tolerances that would be difficult to maintain
Solution Approach 2:
The patent uses partial action by specifying composition ranges rather than exact values, allowing sufficient margin for manufacturing variation while still achieving the required high-temperature strength performance
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 alloy plate provides improved safety vent rupture during thermal runaway, maintaining structural integrity and preventing thermal propagation, while achieving weldability comparable to AA3005 and formability like AA3104.
Implementation Method 1
an aluminum alloy plate for a safety vent and/or a case of a secondary battery, the aluminum alloy plate including 1.25 wt% to 1.5 wt% of manganese (Mn), and 0.6 wt% to 0.8 wt% of magnesium (Mg)
Implementation Method 2
a third act of solution treating the cast aluminum alloy
Data Source
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AI summary
The present disclosure provides an aluminum alloy plate for a case (610) of a secondary battery. The aluminum alloy plate includes 1.25 wt% to 1.5 wt% of manganese (Mn), and 0.6 wt% to 0.8 wt% of magnesium (Mg).