Electrode assembly and battery cell including same

The electrode assembly with an insulating coating and protrusions on the positive electrode, along with uncoated areas, addresses the issue of N/P ratio reversal, ensuring safe lithium ion movement and minimizing capacity loss, thus improving battery safety and efficiency.

JP7768588B2Active Publication Date: 2025-11-12LG ENERGY SOLUTION LTD
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Patent Information

Application Number
JP2023539911
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2022-10-21
Filing Date
2022-10-21
Publication Date
2025-11-12
Estimated Expiration
2042-10-21

AI Technical Summary

Technical Problem

Existing electrode assemblies face issues with lithium ion deposition due to N/P ratio reversal, leading to rapid battery deterioration during high-rate charge and discharge, which is not effectively addressed by conventional designs.

Method used

The electrode assembly includes a positive electrode with an insulating coating layer covering part of the active material layer and protrusions, and a negative electrode with uncoated portions, arranged to maintain a favorable N/P ratio and prevent lithium ion deposition.

Benefits of technology

This design minimizes capacity loss while effectively preventing N/P ratio reversal, ensuring safe and efficient lithium ion movement, thereby enhancing battery performance.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

According to an embodiment of the present invention, there is provided an electrode assembly comprising: a positive electrode including a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector; and a negative electrode including a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector, the positive electrode and the negative electrode being disposed in a direction in which the positive electrode active material layer and the negative electrode active material layer face each other. The positive electrode includes an insulating coating layer covering from an end of the positive electrode active material layer to at least a portion of the positive electrode active material layer, and the insulating coating layer includes at least one protrusion protruding from the end of the positive electrode active material layer toward a center of the positive electrode active material layer.
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Citation Information

Patent Citations

  • Cylindrical nonaqueous electrolyte secondary battery

    JP2007080795A

  • Positive electrode for nonaqueous electrolyte battery, and nonaqueous electrolyte battery

    WO2013176161A1