Battery Electrode Plate Conductive Layer Layout for Lower Resistance
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries face high internal resistance due to small connection areas between electrode plates and electricity collecting leads, leading to low electricity collecting efficiency, which can result in reduced battery capacity when attempting to improve conductivity.
Innovation Solution
The electrode plates for non-aqueous electrolyte secondary batteries feature a second active substance layer with higher electrical conductivity than the first layer, strategically applied to enhance current flow without excessive reduction in battery capacity, by forming a higher concentration of electrically conductive material in specific areas to reduce internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection area between electrode plate and electricity collecting lead is increased, then electricity collecting efficiency is improved, but battery capacity is reduced
Solution Approach 1:
The patent applies different combined materials with different electrical conductivities to different regions of the electrode plate. A first combined material with higher electrical conductivity is applied to a first region, while a second combined material with lower electrical conductivity is applied to a second region. This local differentiation allows the high-conductivity region to improve electricity collection efficiency near the lead connection, while the low-conductivity region preserves battery capacity by maintaining appropriate electrochemical activity.
2Reliability
If the electrical conductivity of the combined material is uniformly increased, then internal resistance is reduced, but battery reaction efficiency is degraded
Solution Approach 1:
Instead of uniformly increasing electrical conductivity across the entire electrode plate, the patent implements local quality enhancement by applying a first combined material with higher electrical conductivity only to a specific first region. This localized approach reduces internal resistance in the critical area near the electricity collecting lead without degrading battery reaction efficiency in other regions where the second combined material with lower conductivity is applied.
Solution Approach 2:
The electrode plate is segmented into multiple regions with different combined material compositions. The first region receives a first combined material optimized for electrical conductivity, while the second region receives a second combined material optimized for battery reaction efficiency. This segmentation allows each region to perform its specific function optimally, resolving the contradiction between reducing internal resistance and maintaining battery reaction efficiency.
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 configuration effectively reduces internal resistance without significantly decreasing battery capacity, allowing for improved electricity collection efficiency and prolonged battery performance.
Implementation Method 1
a first combined material having a first electrical conductivity and comprising a cathode active substance, an electrically conductive material, and a bonding material
Data Source
Figure 1
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AI summary
This electrode plate for a non-aqueous electrolyte secondary battery has a band-like core and a first active substance layer formed on at least a first surface of the core. A current-collecting lead is connected to an exposed section at which a portion of the first surface of the core is exposed in the longitudinal direction. The electrode plate for a non-aqueous electrolyte secondary battery has a second active substance layer which is more electroconductive than the first active substance layer and which is disposed on a portion of the first surface such that it adjoins with the exposed section.