Power storage device

The electrode body design with a low-density active material region enhances electrolyte permeability and heat dissipation, addressing the challenges of maintaining energy density and safety in energy storage devices.

WO2026127116A1 Publication Date: 2026-06-18PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
Filing Date
2025-12-12
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Existing energy storage devices face challenges in maintaining high electrolyte permeability and heat dissipation while preserving energy density, often leading to reduced safety and battery performance.

⚗Method used

The electrode body design includes a first active material layer with a region of lower mass per unit volume and a higher active material particle size, positioned to enhance electrolyte permeability and heat dissipation, while minimizing energy density loss, by arranging the electrode body within a cylindrical case to optimize heat and electrolyte flow.

🎯Benefits of technology

This configuration improves electrolyte permeability and heat dissipation, maintaining high energy density and ensuring safety by preventing heat buildup and facilitating efficient electrolyte distribution.

✦ Generated by Eureka AI based on patent content.

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Abstract

This power storage device comprises an electrode body in which a first electrode plate and a second electrode plate are wound with a separator interposed therebetween, an electrolyte, a bottomed cylindrical case, and a sealing body. The first electrode plate is provided with a current collector having a first main surface and a second main surface, and a first active material layer provided on the first main surface. The first active material layer includes a first region extending from one width-direction end of the current collector to an intermediate point, and a first main region extending from the intermediate point to the other width-direction end. The mass per unit volume of the first active material layer in the first region is at least 50% and less than 100% of the mass per unit volume of the first active material layer in the first main region, and the proportion of the first region in the first active material layer is 50% or less. The electrode body is accommodated inside the case such that the the first region faces the sealing-body side and the first main region faces the bottom-part side of the case.
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