Energy storage element

The energy storage element enhances safety and insulation stability by using a dual insulating member configuration with insertion portions and insulating walls to prevent contact between the tab portion and the container, addressing displacement issues in conventional designs.

JP7868348B2Active Publication Date: 2026-06-02GS YUASA CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
GS YUASA CORP
Filing Date
2022-02-22
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Conventional secondary batteries face issues with electrical insulation between the tab portion and the container due to displacement of insulating portions, leading to potential exposure and reduced insulation, and difficulties in controlling the position of insulating sheets near the tab portion.

Method used

An energy storage element with a configuration that includes a current collector connected to an electrode body, a first insulating member between the current collector and the container wall, and a second insulating member with insertion portions and insulating walls to stabilize the position and increase the insulating distance between the tab portion and the container.

Benefits of technology

The solution provides improved safety and stability of electrical insulation, even under vibrations or shocks, while maintaining a compact design and reducing the risk of contact between the tab portion and the container.

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Patent Text Reader

Abstract

To provide a power storage element of improved safety with a simple configuration.SOLUTION: A power storage element 10 includes an electrode body 600, a container 100, a collector 500 electrically connected to the electrode body 600, a first insulating member 400 disposed between the collector 500 and a lid plate 120 of the container 100, and a second insulating member 700 housed in the container 100, the second insulating member being separate from the first insulating member 400. The electrode body 600 has an electrode body 601, and a tab portion 602 projecting from an end portion of the electrode body 601 in a Z-axis direction and joined to the collector 500 disposed in the Z-axis direction of the electrode body 600. The second insulating member 700 has a first insertion portion 701 and an insulating wall portion 710. The first insertion portion 701 is inserted between the collector 500 and the lid plate 120, and disposed to overlap the peripheral part 402 of the first insulating member 400 in the Z-axis direction. The insulating wall portion 710 is disposed at a position facing the tab portion 602 in a Y-axis direction orthogonal to the first direction.SELECTED DRAWING: Figure 6
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