Positive Electrode Termination Tape Layout 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 from deformation and warping of termination tapes at high temperatures and pressures, which can cause short-circuits and lithium deposition issues.
Innovation Solution
A battery design with a termination tape on the positive electrode plate, featuring a specific area-to-width ratio and a cross-linked modified rubber adhesive layer with vinylene carbonate, combined with a non-aqueous electrolyte solution containing a high concentration of lithium salt and fluoroethylene carbonate, to enhance insulation and stability at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional batteries are used with standard electrolyte formulations, then manufacturing cost is controlled, but high-temperature safety performance is poor leading to fires or explosions
Solution Approach 1:
The patent modifies the electrolyte composition by incorporating fluoroethylene carbonate and maintaining a high lithium salt concentration (1.5-3.0 mol/L), which changes the chemical parameters to improve thermal stability and prevent decomposition at high temperatures, thereby eliminating fire and explosion hazards
Solution Approach 2:
The patent uses a composite adhesive layer combining modified rubber with vinylene carbonate cross-linking agents, creating a material with enhanced high-temperature resistance that prevents termination tape deformation and the associated safety hazards
2Reliability
If termination tape area is increased to prevent short-circuits, then safety improves, but battery density decreases
Solution Approach 1:
The patent optimizes the termination tape area ratio to 1-3%, which is sufficient to prevent short-circuits while minimizing the space occupied, thereby maintaining high battery energy density without compromising safety
3Reliability
If adhesive layer is made stronger to prevent deformation, then safety improves, but manufacturing complexity increases
Solution Approach 1:
The patent enhances the adhesive layer by adding vinylene carbonate as a cross-linking agent at controlled concentrations, which improves high-temperature strength through chemical cross-linking while maintaining a relatively simple formulation that does not significantly increase manufacturing complexity
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 reduces the risk of short-circuits and lithium deposition, improving the battery's high-temperature performance and safety by maintaining adhesive layer integrity and forming a stable SEI film, thus preventing deformation and warping-related failures.
Implementation Method 1
forming a stable SEI film
Implementation Method 2
cross-linked modified rubber adhesive layer with vinylene carbonate
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. An electrolyte additive includes fluoroethylene carbonate. 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, a content of fluoroethylene carbonate is B2 wt %; and a width of the positive electrode plate is C cm; wherein a ratio of A to B2 is in a range of 0.5-5 and a ratio of A to C is in a range of 1 to 3. The battery can effectively improve high-temperature performance.