Battery cell arrangement, cell separating element, and battery cell for an energy store of a motor vehicle

Patent metadata

Field	Value
Publication number	US-12573687-B2
Application number	US-202318164781-A
Country	US
Kind code	B2
Filing date	Feb 6, 2023
Priority date	Feb 23, 2022
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

A battery cell arrangement for a motor vehicle. The battery cell arrangement has at least a first battery cell with a first cell housing that includes a first cell wall, and a second battery cell is arranged adjacent to the first battery cell in a first direction and that has a second cell housing with a second cell wall. The first cell wall and the second cell wall face each other. The battery cell arrangement has a gas reservoir which is filled with a gas, so that the gas is arranged between the first cell wall of the first battery cell and the second cell wall of the second battery cell.

First claim

The invention claimed is:

1 . A battery cell arrangement for a motor vehicle, comprising:
at least one first battery cell with a first cell housing which comprises a first cell wall, and a second battery cell which is arranged adjacent to the first battery cell in a first direction and has a second cell housing with a second cell wall; wherein the first cell wall and the second cell wall face each other; wherein the battery cell arrangement has a gas reservoir which is filled with a gas, so that the gas is arranged between the first cell wall of the first battery cell and the second cell wall of the second battery cell; wherein the gas reservoir is configured as a component separate from the first battery cell and the second battery cell, the gas reservoir having a first reservoir wall and a second reservoir wall which delimit an interior space of the gas reservoir on both sides with respect to the first direction, the first reservoir wall and the second reservoir wall being joined together in a peripheral edge region to delimit the interior space in a gas-tight manner; wherein the gas reservoir has at least one releasable gas outlet opening in the peripheral edge region, and the gas reservoir is configured such that a thermal runaway of the first battery cell and/or the second battery cell causes a release of the releasable gas outlet opening and a discharge of the gas through the released gas outlet opening in order to cool the first battery cell and/or second battery cell, wherein the at least one releasable gas outlet opening is configured to open when a specific condition that a temperature and/or a pressure of the gas exceeds a predeterminable threshold value; wherein a closure element is provided for closing the peripheral edge region; and wherein the gas reservoir has a gas guide element which is arranged in a region of the at least one releasable gas outlet opening and which is configured to deflect a flow direction of the gas flowing out of the gas outlet opening toward the first battery cell and/or the second battery cell.

2 . The battery cell arrangement according to claim 1 , wherein a state parameter comprises a gas pressure and/or a gas temperature assigned to the gas accommodated in the gas reservoir, wherein the battery cell arrangement is configured such that the state parameter can be changed and wherein a change in the state parameter is controllable.

3 . The battery cell arrangement according to claim 1 , wherein the first reservoir wall and/or the second reservoir wall is configured with a wall structure such that a thickness of the interior space varies at least in a second direction perpendicular to the first direction.

4 . The battery cell arrangement according to claim 1 , wherein a respective spacer is arranged as part of the gas reservoir along at least two opposite edges of the peripheral edge region with respect to a direction perpendicular to the first direction, which defines a specific minimum thickness of the gas reservoir in the first direction at the edges.

5 . A cell separating element for arrangement between two battery cells of a cell stack,
the cell separating element configured as a gas reservoir comprising a first reservoir wall and a second reservoir wall, wherein the first reservoir wall and the second reservoir wall, being joined together in a peripheral edge region, gas-tightly delimit an interior space of the gas reservoir on both sides with respect to a first direction, the gas being accommodated in the interior space; wherein a respective spacer is arranged as part of the gas reservoir along at least two opposite edges of the peripheral edge region with respect to a direction perpendicular to the first direction, which defines a specific minimum thickness of the gas reservoir in the first direction at the edges; wherein at least one releasable gas outlet opening is arranged in the peripheral edge region and is configured to open when a temperature and/or a pressure of the gas exceeds a predeterminable threshold value; wherein a closure element is provided for closing the peripheral edge region; and wherein a gas guide element is arranged in a region of the gas outlet opening and is configured to deflect a flow direction of the gas toward at least one of the battery cells.

6 . A battery cell for an energy store of a motor vehicle, comprising:
a cell housing comprising an inner wall and an outer wall, the inner wall adjoining an interior of the battery cell enclosed by the cell housing, and the outer wall adjoining an environment surrounding the battery cell, wherein the inner wall forms a first reservoir wall of a gas reservoir and the outer wall forms a second reservoir wall of the gas reservoir, wherein the outer wall is arranged in a first direction next to the inner wall, and together the inner wall and the outer wall enclose an interior space that is different from the interior of the battery cell and filled with a gas; wherein the inner wall and the outer wall are joined together in a peripheral edge region, so that they delimit the interior space in a gas-tight manner that accommodates the gas; wherein a respective spacer is arranged as part of the gas reservoir along at least two opposite edges of the peripheral edge region with respect to a direction perpendicular to the first direction, which defines a specific minimum thickness of the gas reservoir in the first direction at the edges; wherein at least one releasable gas outlet opening is arranged in the peripheral edge region and is configured to open when a temperature and/or a pressure of the gas exceeds a predeterminable threshold value; wherein a closure element is provided for closing the peripheral edge region; and wherein a gas guide element is arranged in a region of the gas outlet opening and is configured to deflect a flow direction of the gas toward the battery cell.

Assignees

• Audi Ag

Inventors

• Thurmeier Markus
• Voigt Christian Gert
• Dirisamer Florian

Classifications

• H01M10/647

  Prismatic or flat cells, e.g. pouch cells · CPC title

• B60L50/66

  Arrangements of batteries · CPC title

• B60L50/64

  Constructional details of batteries specially adapted for electric vehicles · CPC title

• B60L58/26

  by cooling · CPC title

• H01M50/103

  prismatic or rectangular (H01M50/109, H01M50/11 take precedence) · CPC title