Electrode Assembly Insulation Coating for Uniform Battery Plate Gaps
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Solution Overview
Problem
Secondary batteries face safety concerns due to potential short circuits and uneven gap formation between electrode plates, which can lead to reliability issues.
Innovation Solution
The electrode assembly incorporates an insulation coating layer made of ceramic materials on the cathode plate facing the anode tab, with a thickness matching the cathode active material layer, to prevent short circuits and ensure gap uniformity and flatness between the plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulation coating layer is formed on the cathode plate facing the anode tab, then short circuit prevention is improved, but device complexity increases
Solution Approach 1:
An insulation coating layer made of ceramic material is introduced as an intermediary between the cathode plate and anode tab. This coating layer acts as a mediator that prevents direct contact and potential short circuits between the cathode active material and anode tab, while maintaining the electrical functionality of the battery components.
Solution Approach 2:
The insulation coating layer is formed on the cathode plate before assembly, proactively preventing short circuit risks before they can occur during battery operation. This preliminary protective action ensures safety is built into the structure from the outset rather than requiring corrective measures later.
2Manufacturing precision
If the insulation coating layer thickness is matched to the cathode active material layer thickness, then gap uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The thickness of the insulation coating layer is controlled to match the thickness of the cathode active material layer. By controlling this critical parameter, the patent ensures uniform gaps between the cathode plate and anode tab throughout the battery structure, preventing localized short circuits and ensuring consistent performance.
Solution Approach 2:
The insulation coating is applied specifically to the region of the cathode plate that faces the anode tab, rather than coating the entire cathode plate. This localized application provides precise insulation where needed while maintaining gap uniformity in the critical interface region between electrodes.
Data Source
AI summary
The present invention relates to: an electrode assembly which can improve safety by securing the flatness and gap uniformity between pole plates; and a secondary battery using same. For example, disclosed is a secondary battery comprising: an anode plate comprising an anode current collector, an anode active material layer formed by coating an anode active material on the anode current collector, and an anode center uncoated part in which an anode tab is attached to the center of the anode current collector; a cathode plate comprising a cathode current collector, a cathode active material layer formed by coating a cathode active material on the cathode current collector, and a cathode center uncoated part in which a cathode tab is attached to the center of the cathode current collector; a separator interposed between the anode plate and the cathode plate; and an electrode assembly formed of an insulation coating layer formed on a portion, on the cathode current collector, facing the anode tab, a portion facing the anode tab and the anode center uncoated part, or a portion facing the anode tab, the anode center uncoated part, and an insulating member attached to the anode tab.