Positive Electrode Sheet Layout for Battery Heat Dissipation
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Solution Overview
Problem
Lithium-ion batteries face safety issues due to increased temperature during charging and discharging, leading to thermal runaway, especially with higher capacity and charging rates.
Innovation Solution
A positive electrode sheet design with specific coated areas, including a porous material layer between active material layers, enhances heat dissipation and reduces internal resistance, incorporating ceramic powder and inorganic ion materials for insulation and flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the capacity and charging rate of lithium-ion batteries are increased, then the energy storage and charging speed are improved, but the temperature of electrode sheets increases causing thermal runaway and safety problems
Solution Approach 1:
The electrode sheet is segmented into multiple coated areas (first, second, and third coated areas) along the length direction, with the second coated area having a porous material layer with larger pore size and porosity. This segmentation allows different regions to have different properties, with the porous region providing enhanced heat dissipation pathways while maintaining overall battery capacity and charging rate.
Solution Approach 2:
The patent applies local quality by creating a specific porous material layer in the second coated area with pore size greater than 50 nm and porosity greater than 30%, while the first and third coated areas have different material compositions. This local modification of material properties enables targeted heat dissipation in critical regions without compromising the overall energy storage capacity or charging rate of the battery.
2Temperature
If a porous material layer with large pore size and high porosity is introduced, then heat dissipation is improved and temperature rise is reduced, but the internal structure complexity increases
Solution Approach 1:
The electrode sheet is divided into distinct coated areas along the length direction, with the porous material layer specifically positioned in the second coated area. This segmentation allows the porous structure to be introduced in a controlled manner rather than throughout the entire electrode, thereby improving heat dissipation while limiting the increase in structural complexity to specific regions only.
Solution Approach 2:
The porous material layer is locally applied in the second coated area with specific pore size (>50 nm) and porosity (>30%) characteristics, while other areas maintain their conventional structure. This localized approach enables effective heat dissipation in critical regions without requiring complex porous structures throughout the entire electrode, thus balancing heat management needs with structural simplicity.
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 design effectively reduces temperature rise and improves safety by increasing heat dissipation and reducing internal resistance, while maintaining battery capacity and cycle life.
Implementation Method 1
the porous material layer has a pore size of greater than 50 nm, and a porosity of greater than 30%... effectively increases heat dissipation area... improves heat dissipation
Implementation Method 2
incorporating ceramic powder and inorganic ion materials for insulation and flame retardancy
Implementation Method 3
the ion exchange between a positive electrode active material and a negative electrode active material of a positive electrode sheet and a negative electrode sheet realizes charging and discharging
Data Source
AI summary
Provided in the present application are a positive electrode sheet and a battery. The positive electrode sheet includes a positive electrode current collector, a first coated area, a second coated area, and a third coated area are included on one side or two sides of the positive electrode current collector, and the first coated area, the second coated area, and the third coated area are distributed in a first direction, the first direction is a length direction of the positive electrode current collector; the second coated area is disposed between the first coated area and the third coated area in a width direction of the positive electrode current collector; the first coated area and the third coated area are coated with a positive electrode active material layer, the second coated area is coated with a porous material layer.