Secondary battery and method for manufacturing same

The insulating frame in secondary batteries is reinforced with a flexible portion on the tab side to prevent damage from deformation, ensuring the frame's integrity and preventing short circuits during charging and discharging.

WO2026088340A1PCT designated stage Publication Date: 2026-04-30NISSAN MOTOR CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
NISSAN MOTOR CO LTD
Filing Date
2024-10-23
Publication Date
2026-04-30

AI Technical Summary

Technical Problem

The insulating frame in secondary batteries is prone to damage due to stress from the positive electrode current collector deformation caused by expansion and contraction during charging and discharging, which can lead to short circuits.

Method used

The insulating frame is designed with a flexible portion on the tab side and a rigid portion on the non-tab side, where the flexible portion has a lower Young's modulus than the rest, allowing it to accommodate deformation without damage.

Benefits of technology

This design prevents damage to the insulating frame, maintains its functionality, and reduces the risk of short circuits by allowing the frame to flex with the positive electrode current collector's expansion and contraction.

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    Figure JP2024037785_30042026_PF_FP_ABST
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Abstract

This secondary battery comprises: a positive electrode current collector; a positive electrode layer; an insulating frame disposed on the positive electrode current collector so as to surround the positive electrode layer; a solid electrolyte layer; a negative electrode layer; and a negative electrode current collector. The positive electrode current collector extends laterally from a portion where the positive electrode layer is disposed so as to be connected to a current collector tab. The insulating frame has a tab side and a non-tab side. The tab side is on the side where the positive electrode current collector extends toward the current collector tab. The tab side has a flexible portion having a Young's modulus lower than that of other portions of the insulating frame.
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Citation Information

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