Battery pack and battery system

Patent metadata

Field	Value
Publication number	US-2025038377-A1
Application number	US-202418645639-A
Country	US
Kind code	A1
Filing date	Apr 25, 2024
Priority date	Jul 28, 2023
Publication date	Jan 30, 2025
Grant date	—

Abstract

A cell is a sulfide-based all-solid-state cell. The bus bar of the battery module composed of cells electrically connected in series is connected to the voltage detecting circuit via a printed circuit board including a first conductive trace, a second conductive trace, and a third conductive trace. A portion of the third conductive trace is exposed from the insulating coating film by a cutout portion (missing portion) of the insulating coating film. When the difference between the cell voltage between the first conductive trace and the second conductive trace and the cell voltage between the first conductive trace and the third conductive trace is equal to or larger than a predetermined value, it is determined that the exposed portion of the third conductive trace has been corroded by gas generated from the cell and that gas has been generated from the cell.

First claim

What is claimed is:

1 . A battery pack comprising:
a cell housed in a battery case and including a first electrode terminal and a second electrode terminal, the cell being a sulfide-based all-solid-state cell; and a printed circuit board including a conductive trace connected to the first electrode terminal and the second electrode terminal, wherein: the printed circuit board includes
a first conductive trace connected to the first electrode terminal,
a second conductive trace and a third conductive trace that are connected to the second electrode terminal, and
an insulating coating film covering the first conductive trace, the second conductive trace, and the third conductive trace; and
at least a portion of the third conductive trace is exposed from the insulating coating film, and is exposed to gas that is generated from the cell.

2 . The battery pack according to claim 1 , wherein the portion of the third conductive trace that is exposed from the insulating coating film is smaller in thickness than a portion of the third conductive trace that is covered by the insulating coating film.

3 . The battery pack according to claim 1 , wherein:
the cell includes
a power generation element that is an all-solid-state cell stack, and
an exterior member made of a laminate film, the exterior member containing the power generation element with a peripheral edge portion of the exterior member bonded by heat welding to seal the power generating element in the exterior member; and
the portion of the third conductive trace that is exposed from the insulating coating film is disposed adjacent to the second electrode terminal.

4 . A battery system comprising:
the battery pack according to claim 1 ; a detection device connected to the printed circuit board; and a control device, wherein the control device determines that the gas has been generated when the control device detects, using the detection device, that the portion of the third conductive trace that is exposed from the insulating coating film has been corroded.

5 . The battery system according to claim 4 , wherein:
the detection device is a voltage detecting circuit for the cell; and the control device determines that the gas has been generated when a difference between a first cell voltage and a second cell voltage is equal to or more than a predetermined value, the first cell voltage being a voltage of the cell detected using the first conductive trace and the second conductive trace, and the second cell voltage being a voltage of the cell detected using the first conductive trace and the third conductive trace.

Assignees

• Toyota Motor Co Ltd

Inventors

• Ukita Keisuke
• Kuruma Yusuke
• Migita Tsubasa
• Morikawa Kei
• Oguma Yasumasa

Classifications

• H01M50/284

  with incorporated circuit boards, e.g. printed circuit boards [PCB] · CPC title

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title

• H01M50/569 Primary

  Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals (battery terminal connectors with integrated measuring arrangements G01R31/364) · CPC title