Cylindrical secondary battery

By optimizing the surface roughness of the cover portion to Ra 0.7 to 1.5 μm and Rz 2.5 μm or less, the battery addresses adhesion issues, preventing moisture ingress and reducing short circuits in cylindrical secondary batteries.

DE102025103147A1Pending Publication Date: 2025-07-31MURATA MFG CO LTD
View PDF 3 Cites 0 Cited by

Patent Information

Application Number
DE102025103147
Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-01-30
Filing Date
2025-01-29
Publication Date
2025-07-31

AI Technical Summary

Technical Problem

Conventional cylindrical secondary batteries face issues with insufficient adhesion between the outer cylindrical portion and the covering portion, leading to moisture ingress and potential short circuits due to tracking phenomena.

Method used

The cylindrical secondary battery design includes specific surface roughness parameters, with an average roughness (Ra) of 0.7 to 1.5 μm and maximum height roughness (Rz) of 2.5 μm or less for the cover portion, enhancing adhesion and preventing moisture ingress.

Benefits of technology

This design effectively suppresses moisture penetration, reducing short circuits and corrosion, thereby improving the battery's reliability and safety.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 00000000_0000_ABST
    Figure 00000000_0000_ABST
Patent Text Reader

Abstract

A cylindrical secondary battery is provided which enables improved adhesion between an outer portion and a cover portion.The present disclosure relates to a cylindrical secondary battery comprising: a cylindrical outer portion having a battery element therein and opposite end portions and an outer peripheral surface disposed therebetween; and a cover portion covering at least a part of both the end portions of the outer portion and the entire outer peripheral surface, wherein the outer portion includes a cylindrical main body having an opening at one end side and a bottom at another end side opposite to the one end side, and a lid closing the opening, wherein a calculated average roughness (Ra) of the cylindrical main body is 0.7 to 1.5 µm, and a maximum height roughness (Rz) of an inner surface of the cover portion in a radial direction of the bottom of the main body is 2.5 µm or less.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • 2005-171127

  • 2017-132865

  • 2019-535100