Positive Electrode Termination Tape Sizing for High-Temperature Batteries
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Solution Overview
Problem
Lithium-ion batteries face safety hazards due to poor high-temperature safety performance, leading to potential fires or explosions, especially at high voltages, as a result of local deformation and warping of termination tapes and electrolyte decomposition.
Innovation Solution
A battery design incorporating a positive electrode plate with a termination tape of specific size and material, and a non-aqueous electrolyte solution with controlled lithium salt concentration and additives, such as fluoroethylene carbonate, to enhance high-temperature stability and prevent short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the termination tape area is increased to prevent short-circuits and improve high-temperature safety, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by establishing specific quantitative relationships between termination tape area (A), lithium salt concentration (B1), and electrode plate width (C) through the ratios A/B1 = 2-20 and A/C = 1-3. This transforms the qualitative safety improvement into a precisely controlled parameter optimization, resolving the contradiction between reliability enhancement and device complexity.
Solution Approach 2:
The patent applies local quality by focusing the safety improvement specifically on the termination tape region rather than uniformly modifying the entire battery structure. By optimizing only the termination tape area and its relationship with lithium salt concentration and electrode width, the patent achieves enhanced high-temperature safety with minimal additional complexity.
2Reliability
If the lithium salt concentration is increased to improve high-temperature stability, then the reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent transforms the manufacturing precision challenge into a parameter optimization problem by establishing the ratio A/B1 = 2-20. This allows the lithium salt concentration (B1) to be controlled relative to the termination tape area (A), providing a scalable relationship that maintains high-temperature stability while accommodating manufacturing variations.
Solution Approach 2:
The patent applies partial action by not requiring uniform high lithium salt concentration throughout the entire electrolyte, but rather optimizing the concentration in relation to the termination tape area. This partial optimization approach achieves high-temperature stability without demanding excessive manufacturing precision across all components.
3Reliability
If the termination tape area is increased to prevent electrode edge deformation, then the reliability is improved, but the area of the positive electrode plate is reduced
Solution Approach 1:
The patent resolves this contradiction through parameter optimization by establishing the ratio A/C = 1-3, where A is the termination tape area and C is the electrode plate width. This quantitative relationship ensures that the termination tape is sufficiently large to prevent edge deformation while maintaining adequate electrode plate area for performance.
Solution Approach 2:
The patent applies local quality by concentrating the structural reinforcement function specifically in the termination tape region rather than increasing the overall electrode plate area. The termination tape serves as a localized support structure that prevents edge deformation without compromising the active electrode area.
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 effectively improves high-temperature safety and performance of lithium-ion batteries by reducing short-circuit risks and electrolyte decomposition, maintaining adhesive layer integrity and preventing lithium deposition at electrode edges during cycling.
Implementation Method 1
a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution comprises a non-aqueous organic solvent, a lithium salt, and an optional electrolyte additive
Implementation Method 2
a non-aqueous electrolyte solution, wherein the non-aqueous electrolyte solution comprises a non-aqueous organic solvent, a lithium salt
Data Source
AI summary
Disclosed is a battery. The battery includes a positive electrode plate, a negative electrode plate, a non-aqueous electrolyte solution, and a separator. The non-aqueous electrolyte solution includes a non-aqueous organic solvent and a lithium salt. A termination tape of the positive electrode plate is disposed at a paste coating tail of the positive electrode plate. An area of a termination tape of the positive electrode plate is A cm2; using a total weight of the non-aqueous electrolyte solution as a reference, a content of the lithium salt is B1 mol/L; and a width of the positive electrode plate is C cm; wherein a ratio of A to B1 is in a range of 2-20, and a ratio of A to C is in a range of 1 to 3. The battery can effectively improve high-temperature performance.