Battery pack

A three-dimensional busbar design with increased overlapping areas and ultrasonic bonding addresses joint strength limitations, enhancing stress relief and reducing fatigue failure in battery packs.

JP7876681B2Active Publication Date: 2026-06-19VEHICLE ENERGY JAPAN INC
View PDF 5 Cites 0 Cited by

Patent Information

Application Number
JP2025079189
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-08-05
Filing Date
2025-05-12
Publication Date
2026-06-19
Estimated Expiration
2042-03-23

AI Technical Summary

Technical Problem

Existing busbar joining methods, particularly those using USW and FSW, face limitations in joint strength due to a small overlapping area in the planar direction, especially when the distance between electrode terminals is short, leading to potential bonding issues and fatigue failure.

Method used

A busbar design with a three-dimensional structure that increases the overlapping area of metal plates by using extending portions and additional joint portions, joined by ultrasonic bonding, to enhance joint strength and stress relief.

Benefits of technology

The design provides effective stress relief in multiple directions and ensures high bonding strength, reducing the risk of fatigue failure and maintaining flatness at the terminal connections.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 0007876681000001
    Figure 0007876681000001
  • Figure 0007876681000002
    Figure 0007876681000002
  • Figure 0007876681000003
    Figure 0007876681000003
Patent Text Reader

Abstract

To provide a highly reliable bus bar for connecting positive and negative electrodes in a battery pack in which rectangular parallelepiped cells are arranged.SOLUTION: There is provided a battery pack in which: a positive terminal of a first cell and a negative terminal of a second cell are arranged adjacent to each other; a bus bar 10 connects the positive and negative terminals; a first conductive member 11 of the bus bar includes a first joint 111 that joins with the positive terminal and a first extension 112 that extends in a first direction; a second conductive member 12 of the bus bar includes a second joint 121 that joins with the negative terminal and a second extension 122 that extends in the first direction; the first conductive member and the second conductive member are connected at a third joint 131; an end of the first extension and an end of the second extension are spaced apart in the first direction from a line connecting the first joint and the second joint; and the third joint is near either the first joint or the second joint and is formed at an overlapping portion between the first extension and the second extension.SELECTED DRAWING: Figure 2
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Connection method of battery output terminal with terminal fitting, and connection structure of battery output terminal with the terminal fitting

    JP2007073266A

  • Power storage module and power storage cell

    JP2015099647A

  • Bus bar for battery pack and battery pack

    JP2017073398A

  • Battery pack

    JP2018116894A

  • Power source device

    WO2018139350A1