Battery Electrode Collector Layout for Fast Charging Heat Dissipation
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Solution Overview
Problem
Existing secondary battery cells, particularly lithium-ion battery cells, face limitations in charging speed due to heat generation and ohmic resistance, especially in the discharge tab and collector section, which can lead to damage and reduced performance.
Innovation Solution
The electrode design features a base body with a collector section and a contact section, where the collector section and contact section have different electrical and thermal conductivities, allowing for optimized conductivity and heat dissipation. This design can include varying thicknesses and materials for the collector and contact sections, such as metal foils, polymer films, or carbon films, to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging rate is increased to improve charging speed, then charging time is reduced, but heat generation and ohmic resistance increase causing damage risk
Solution Approach 1:
The patent applies local quality by creating a multi-layer current collector structure where different regions have different thermal conductivities. The first current collector layer has higher thermal conductivity than the second layer, allowing heat to be efficiently conducted away from the electrode active material contact region while maintaining electrical functionality. This localized differentiation of thermal properties enables high-rate charging without excessive heat accumulation.
Solution Approach 2:
The patent employs composite materials by combining multiple current collector layers with different thermal conductivities into a single functional structure. The first current collector layer (higher thermal conductivity) and second current collector layer (lower thermal conductivity) work together as a composite system, where each layer performs its specific thermal management function while collectively enabling fast charging with controlled heat generation.
2Temperature
If the current collector thermal conductivity is increased to improve heat dissipation, then charging speed can be increased, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies segmentation by dividing the current collector into multiple distinct layers, each with specific thermal conductivity characteristics. The first current collector layer is segmented from the second layer, allowing independent optimization of thermal properties for each layer. This segmentation enables complex thermal management functionality while maintaining a relatively simple laminated structure that can be manufactured using conventional techniques.
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
This electrode design enables faster charging by improving heat dissipation and reducing electrical resistance, thus enhancing the overall performance and safety of secondary battery cells and traction batteries in electric vehicles.
Implementation Method 1
the first current collector layer (22) having a higher thermal conductivity than the second current collector layer (24)
Implementation Method 2
The maximum achievable charging speed (charging rate) of the charging process must be limited due to heat generation and/or the ohmic resistance of the battery cells, particularly the discharge tab and the collector section
Data Source
Figure 1
Figure 2a~2c
Figure 3a~3b
AI summary
The invention relates to an electrode (18) for a secondary battery cell (8), wherein the electrode (18) has an electrode base body (20), in particular a foil-like one, wherein the electrode base body (20) has a collector section (22) as a current collector and a contact section (24) for electrical contact with a cell current collector, and wherein the collector section (22) and the contact section (24) have different electrical conductivities (σCol, σCon) and/or different thermal conductivities (λCol, λCon). The invention further relates to a secondary battery cell (BZ) with such an electrode (18) and to an electrically powered motor vehicle (KFZ) whose traction battery (TB) comprises such a secondary battery cell (BZ).