Color-Coded Electrode Sheet Layout for Battery Side Identification
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Solution Overview
Problem
Conventional electrode sheets lack effective visual differentiation between the positive and negative sides due to identical colors, leading to potential misplacement during assembly, which can cause capacity loss and battery failure.
Innovation Solution
The electrode sheet features active material layers of different colors on both sides near the electrode tab, using inorganic color developers that maintain chemical stability and do not participate in chemical reactions, allowing easy visual identification of the sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If common insulation layers are used on both sides of the electrode sheet, then the structure is simple and manufacturing is easy, but the positive and negative sides cannot be visually differentiated
Solution Approach 1:
The patent applies local quality by making the insulation layers have different colors on different sides. Specifically, the first insulation layer on the positive side has a first color while the second insulation layer on the negative side has a second color different from the first. This local differentiation allows visual identification of electrode sides without complicating the overall manufacturing process, as the insulation function remains the same while only the color property varies locally.
Solution Approach 2:
The patent directly applies color changes to solve the identification problem. By assigning different colors to the insulation layers on opposite sides of the electrode sheet, the patent enables visual differentiation between positive and negative sides. This is achieved through selecting insulation materials or applying colorants that produce distinguishable colors, allowing operators to quickly identify the correct orientation during assembly without adding complex marking systems.
2Loss of information
If additional markings are added to differentiate sides, then side identification is improved, but the device complexity increases
Solution Approach 1:
The patent merges the identification function with the existing insulation layers. Instead of adding separate marking elements or additional components, the identification information is integrated into the insulation layers themselves through color differentiation. This merging approach eliminates the need for additional markings or complex identification systems, as the insulation layers simultaneously provide both their protective function and the side identification function.
Solution Approach 2:
The insulation layers are given multiple functions: they provide electrical insulation as their primary function, and simultaneously serve as identification markers through their different colors. This multi-functionality reduces the overall complexity of the electrode sheet structure, as one component (the insulation layer) performs both protection and identification roles, eliminating the need for separate identification markings.
3Loss of information
If organic color developers are used, then color differentiation is achieved, but chemical stability and compatibility are compromised
Solution Approach 1:
The patent applies parameter changes by transitioning from organic color developers to inorganic color developers. This parameter change in the chemical composition of the colorant fundamentally alters the chemical stability and compatibility characteristics. Inorganic color developers possess inherent chemical stability and electrochemical inertness that organic compounds lack, thereby maintaining the reliability and long-term performance of the battery while still achieving the desired color differentiation for side identification.
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 solution enables accurate orientation of the electrode sheets without additional markings, preventing misplacement and maintaining battery performance by using chemically stable inorganic color developers.
Implementation Method 1
using inorganic color developers that maintain chemical stability and do not participate in chemical reactions
Data Source
AI summary
Disclosed are an electrode sheet, a battery, and an electronic device. The electrode sheet includes a current collector, an electrode tab, an active substance layer, and an active material layer. The current collector has a first surface and second surface opposite to each other. The electrode tab protrudes from the current collector. The active substance layer is disposed on the first surface and the second surface. The active material layer at least partially overlaps with or has a gap from one end of the active substance layer near the electrode tab. The active material layer includes a first active material layer disposed on the first surface and a second active material layer disposed on the second surface; wherein colors of the first active material layer and the second active material layer are different.