Cylindrical battery

The cylindrical battery's non-circular breakable sealing body design addresses the challenge of clogged openings by ensuring smooth gas and electrode discharge during abnormalities, enhancing safety and efficiency.

WO2026116063A1PCT designated stage Publication Date: 2026-06-04PANASONIC 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
2025-11-10
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Conventional cylindrical batteries face challenges in smoothly discharging gas and electrode materials when an abnormality occurs, as the opening formed by the sealing body may become clogged, leading to potential further temperature rise and inefficient discharge.

Method used

The cylindrical battery design features a sealing body with an annular breakable portion in a non-circular shape that breaks when internal pressure exceeds a predetermined value, ensuring a non-circular opening is formed, allowing for smooth gas discharge even if the electrode body clogs the opening.

Benefits of technology

This design effectively secures a gas discharge path and prevents further temperature rise by ensuring the electrode body is discharged, even if it temporarily obstructs the opening, thereby enhancing safety and efficiency.

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Abstract

A cylindrical battery (10) is provided with: a wound electrode body (14); a bottomed cylindrical outer can (15); and a sealing body (30) that blocks an opening in the outer can (15). The sealing body (30) has an annular easily breakable part (34) that breaks when the internal pressure of the battery exceeds a prescribed value, thereby forming the opening. In a bottom view of the sealing body (30), the easily breakable part (34) is formed in a non-circular shape, and includes a plurality of portions at different distances from the center β of the sealing body (30).
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Citation Information

Patent Citations

  • Sealed battery

    JP1990079361A

  • Electrochemical element

    JP1999162798A