Secondary batteries

JP2026096885APending Publication Date: 2026-06-15MURATA MFG CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
MURATA MFG CO LTD
Filing Date
2024-12-03
Publication Date
2026-06-15

AI Technical Summary

Technical Problem

The presence of gaps near the positive electrode tab in a wound secondary battery can lead to short circuits due to foreign matter intrusion, causing voltage drops.

Method used

A secondary battery design with a positive electrode tab and protective tape that includes a tab projection and tape projection with specific partial projections to cover these gaps, preventing foreign matter ingress.

Benefits of technology

The design effectively suppresses voltage drops by minimizing gap exposure and reducing the risk of short circuits, while also enhancing assembly efficiency and utilizing space within the battery casing.

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Abstract

To suppress voltage drop due to foreign matter contamination in a secondary battery comprising a wound body including a positive electrode and a negative electrode. [Solution] The secondary battery 1, which includes a winding body 10 containing a positive electrode 11 and a negative electrode 12, is equipped with a positive electrode tab 30 and a protective tape 50. The positive electrode tab 30 is equipped with a tab base portion 31 that is positioned on the positive electrode current collector 11a and a tab projection portion 32 that protrudes from the winding body 10. The protective tape 50 is equipped with a tape base portion 51 that covers the tab base portion 31 and the positive electrode current collector 11a, and a tape projection portion 52 that protrudes from the winding body 10. The tape projection portion 52 has a first partial projection portion 52a that covers the tab projection portion 32 and a plurality of second partial projection portions 52b that do not cover the tab projection portion 32. The tab projection portion 32, the first partial projection portion 52a and the plurality of second partial projection portions 52b are bent.
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