Battery Lead Cross-Section for Alloy Anode Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium ion secondary batteries with alloy-type negative electrode active materials face safety concerns due to higher energy density leading to rapid temperature rise during external short circuits, as they have lower conductivity and larger current flow compared to carbon material-based batteries.
Innovation Solution
A non-aqueous electrolyte secondary battery design with a specific electrode plate group configuration, including a positive electrode, negative electrode, separator, and leads with adjusted cross-sectional areas to manage high-output discharge and prevent rapid temperature increases, featuring a negative electrode active material layer with columnar particles grown on a current collector, and optimized lead connections for improved safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If alloy-type negative electrode active material is used to increase capacity, then energy density is improved, but temperature rise during external short circuit becomes more severe
Solution Approach 1:
The patent changes the physical parameter of lead cross-sectional area to control current flow characteristics. By optimizing the lead cross-sectional area within a specific range, the battery can achieve high energy density with alloy-type materials while preventing excessive temperature rise during external short circuits through controlled current distribution.
2Productivity
If alloy-type negative electrode active material is used, then discharge capacity is improved, but conductivity decreases
Solution Approach 1:
The patent optimizes the cross-sectional area parameter of the leads to compensate for the lower conductivity of alloy-type materials. By adjusting this geometric parameter, the electrical resistance is controlled to ensure reliable current flow while maintaining the high discharge capacity benefits of alloy-type negative electrode active materials.
3Reliability
If lead cross-sectional area is increased to prevent melting, then safety is improved, but battery size and weight increase
Solution Approach 1:
The patent identifies and optimizes the lead cross-sectional area within a specific numerical range to achieve the safest possible design with minimal material usage. This parameter optimization allows the battery to prevent lead melting during external short circuits while minimizing the increase in battery weight and size.
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 battery achieves stable high-output characteristics and prevents lead melting or rapid temperature rises during external short circuits, ensuring enhanced safety and performance with an energy density of 750 Wh/L or higher.
Implementation Method 1
a non-aqueous electrolyte secondary battery provided with: a positive electrode; a negative electrode; a separator interposed between the positive electrode and the negative electrode
Implementation Method 2
lithium ion secondary batteries can be given as a typical non-aqueous electrolyte battery
Data Source
AI summary
The non-aqueous electrolyte secondary battery of the present invention is provided with an electrode plate group and a non-aqueous electrolyte, the electrode plate group including a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, a positive electrode lead connected to the positive electrode, and a negative electrode lead connected to the negative electrode. The energy density of the electrode plate group is 750 Wh/L or higher by volume, and the cross-sectional area of at least one of the positive electrode lead and the negative electrode lead is 5.5×10−5 to 1.2×10−2 cm2.