Power Storage Module and Power Storage Device

Patent metadata

Field	Value
Publication number	US-2025349984-A1
Application number	US-202519198173-A
Country	US
Kind code	A1
Filing date	May 5, 2025
Priority date	May 13, 2024
Publication date	Nov 13, 2025
Grant date	—

Abstract

A power storage module comprises a plurality of cells and a bus bar. Each of the cells includes a prismatic case, an electrode terminal, and a power generation element. An outer surface of the prismatic case includes a wide face having a rectangular shape and a side face. The cells are stacked together. The electrode terminal protrudes from the side face toward an outside of the prismatic case. The electrode terminal includes an upper end portion and a lower end portion. The lower end portion is positioned inside the prismatic case. The upper end portion is positioned outside the prismatic case. The bus bar is connected to the electrode terminal at a position in the long-side direction between the upper end portion of the electrode terminal and the side face of the prismatic case.

First claim

What is claimed is:

1 . A power storage module comprising:
a plurality of cells; and a bus bar, wherein each of the cells includes a prismatic case, an electrode terminal, and a power generation element, the prismatic case is hexahedral, an outer surface of the prismatic case includes a wide face having a rectangular shape and a side face, the side face crosses a long-side direction of the wide face, the side face is connected to an end portion of the wide face in the long-side direction, the prismatic case accommodates the power generation element, the cells are stacked together in such a manner that the wide faces of an adjacent pair of the cells face to each other, the electrode terminal protrudes from the side face toward an outside of the prismatic case along the long-side direction of the wide face, the electrode terminal includes an upper end portion and a lower end portion, the lower end portion is positioned inside the prismatic case, the upper end portion is positioned outside the prismatic case, the bus bar connects together the electrode terminals of the cells adjacent to each other, and the bus bar is connected to the electrode terminal at a position in the long-side direction between the upper end portion of the electrode terminal and the side face of the prismatic case.

2 . The power storage module according to claim 1 , wherein
the electrode terminal has a small-diameter portion, a diameter of the small-diameter portion is smaller than a diameter of the upper end portion, in the long-side direction, the small-diameter portion is positioned between the upper end portion and the side face, and the bus bar is engaged with the small-diameter portion.

3 . The power storage module according to claim 2 , wherein
the upper end portion of the electrode terminal has a flange portion extending outwardly in a radial direction of the electrode terminal beyond the small-diameter portion, and the flange portion is welded to the bus bar.

4 . The power storage module according to claim 1 , wherein
the electrode terminal includes a first component and a second component, the first component has a shape of a cap having a recess, and the first component is engaged with the second component.

5 . The power storage module according to claim 1 , wherein
the electrode terminal includes a first component and a second component, and the first component is joined to the second component by a screw mechanism.

6 . The power storage module according to claim 1 , wherein
the power storage module further includes a ring-shaped component, the ring-shaped component is electrically insulating, the electrode terminal is inserted in the ring-shaped component, and the bus bar is connected to a position between the upper end portion of the electrode terminal and the ring-shaped component.

7 . A power storage device comprising:
the power storage module according to claim 1 ; a housing; and an electrically insulating component, wherein the housing accommodates the power storage module and the electrically insulating component, the upper end portion of the electrode terminal faces an inner surface of the housing, and the electrically insulating component is positioned between the upper end portion and the inner surface.

Assignees

• Toyota Motor Co Ltd

Inventors

• Ishikawa Shinya
• Kintsu Yusuke
• Tanaka Takumi
• Haga Masayoshi
• Muraishi Kazuki
• Yamashita Yuji
• Sato Aya

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/588

  outside the batteries, e.g. incorrect connections of terminals or busbars · CPC title

• H01M50/505

  comprising a single busbar · CPC title

• H01M50/566

  by welding, soldering or brazing · CPC title

• H01M50/553 Primary

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title