Energy storage element

The dual-joint configuration in the energy storage element addresses the trade-off between energy density and reliability by positioning the tab portion closer to the container wall and using a bypass conductive path to enhance energy density and reduce resistance.

JP7725822B2Active Publication Date: 2025-08-20GS YUASA CORP
View PDF 9 Cites 0 Cited by

Patent Information

Application Number
JP2021005571
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-01-18
Publication Date
2025-08-20
Estimated Expiration
2041-01-18

AI Technical Summary

Technical Problem

Conventional secondary batteries face a trade-off between improved energy density and reliability due to the use of thin-walled current collectors, which increase the volume but reduce meltdown resistance.

Method used

The energy storage element employs a dual-joint configuration with a thin-walled portion for the current collector, allowing the tab portion to be positioned closer to the container wall, and a bypass conductive path to reduce electrical resistance, enhancing energy density while maintaining reliability.

Benefits of technology

This configuration improves energy density by maximizing the internal volume for the electrode body and minimizes resistance, ensuring reliable electrical connections and reduced defects during the joining process.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 0007725822000001
    Figure 0007725822000001
  • Figure 0007725822000002
    Figure 0007725822000002
  • Figure 0007725822000003
    Figure 0007725822000003
Patent Text Reader

Abstract

To provide a power storage element with improved reliability and energy density.SOLUTION: A power storage element 10 comprises: a container 100; an electrode body 700 and a collector 500 which are housed in the container 100; and a first bonding part 551 and a second bonding part 552. The first bonding part 551 is a portion where the collector 500 is bonded to a tab part 720 of the electrode body 700. The second bonding part 552, formed at a position different from that of the first bonding part 551, is a portion where a conductive member 550 electrically connected to the tab part 720 is bonded to the collector 500. The collector 500 has: a thin part 510 where part of the first bonding part 551 is formed; and a thick part 520, thicker than the thin part 510, where part of the second bonding part 552 is formed.SELECTED DRAWING: Figure 4
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Power storage element and method of manufacturing power storage element

    JP2017157354A

  • Secondary battery and manufacturing method therefor

    JP2019125492A

  • Rechargeable battery

    US20080026291A1

  • Secondary battery

    WO2013168260A1

  • Power storage element, method for manufacturing power storage element, current collector, and cover member

    WO2017057323A1