Fluorine-Coated Battery Electrode Plate for Short-Circuit Isolation
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Solution Overview
Problem
Existing secondary batteries face reliability issues due to potential short circuits and damage to the separator caused by direct contact between the positive and negative electrode plates, which can lead to performance degradation and safety risks.
Innovation Solution
The secondary battery design incorporates a fluorine-containing coating on the ends of the electrode plates to prevent direct contact and a resin insulating member between current collectors and terminals, along with a protective layer on the electrode plates to enhance insulation and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrode plates are placed close together to increase energy density, then productivity and space utilization improve, but the risk of short circuits and separator damage increases
Solution Approach 1:
The patent introduces a protective layer as an intermediary substance between the positive and negative electrode plates. This protective layer prevents direct contact between electrodes while allowing the plates to be positioned close together, thus maintaining high energy density without increasing short circuit risk. The protective layer acts as a mediator that enables close spacing while ensuring electrical isolation.
Solution Approach 2:
The patent applies preliminary protective measures by coating the electrode plates with protective materials before assembly. This preliminary anti-action prevents potential harmful contact between electrodes in advance, allowing the design to maximize space utilization without compromising reliability. The protective coating is applied beforehand to ensure electrodes cannot directly contact even under compression or deformation.
2Reliability
If protective layers and insulating members are added to prevent short circuits, then reliability improves, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent merges multiple protective functions into integrated components. The protective layer is combined with the electrode plate structure itself, and insulating members are integrated into the sealing plate design. This merging reduces the number of separate components while maintaining comprehensive protection against short circuits, thus improving reliability without proportionally increasing device complexity.
Solution Approach 2:
The patent designs components with multiple functions. The sealing plate serves both as a closure element and as a structural support that positions electrodes. The protective layer provides both electrical insulation and mechanical protection. This multi-functionality reduces the overall number of components needed while maintaining reliable short circuit prevention.
3Reliability
If multiple protective measures are implemented, then reliability improves, but manufacturing cost and process time increase
Solution Approach 1:
The patent implements preliminary protective actions during the electrode plate manufacturing process itself. The protective layer is applied to electrode plates before assembly into the battery pack, and insulating members are pre-positioned in the sealing plate. This preliminary action ensures protection is built-in during manufacturing rather than requiring additional assembly steps, thus improving reliability while controlling manufacturing complexity and cost.
Data Source
Figure 1~2
Figure 3(a)~4(b)
Figure 5(a)~5(c)
AI summary
Provided are: a highly reliable secondary battery electrode plate; and a secondary battery using same. The electrode plate is a positive electrode plate (4) for a secondary battery, the positive electrode plate (4) having a metallic positive electrode core body (4a) and a positive electrode active material layer (4b) formed on both surfaces of the positive electrode core body (4a), wherein the positive electrode plate (4) has a first edge (4A) and a positive electrode tab (40) protruding from the first edge (4a), and a fluorine-containing coating (4y) is formed on the end surface of the positive electrode core body (4a) at the first edge (4A) of the positive electrode plate (4). The secondary battery has the positive electrode plate (4) and a negative electrode plate (5).