Battery device and battery system including the same

Patent metadata

Field	Value
Publication number	US-2024347851-A1
Application number	US-202418634341-A
Country	US
Kind code	A1
Filing date	Apr 12, 2024
Priority date	Apr 13, 2023
Publication date	Oct 17, 2024
Grant date	—

Abstract

A battery device includes a cell assembly; a case accommodating the cell assembly; and at least one venting portion in the case to discharge gas generated from the cell assembly to the outside of the case; wherein the at least one venting portion includes a hole cover surrounded by a first region formed by cutting a surface of the case and a second region connected to a surface of the case, and a sealing member covering the first region, wherein the hole cover is lifted from a surface of the case and comprises a venting hole in the at least one venting portion, and wherein the sealing member seals the first region to prevent gas from flowing through the first region in a state in which the hole cover covers the venting hole.

First claim

What is claimed is:

1 . A battery device, comprising:
a cell assembly including a plurality of battery cells; a case accommodating the cell assembly; and at least one venting portion in the case to discharge gas generated from the cell assembly to the outside of the case; wherein the at least one venting portion includes a hole cover surrounded by a first region formed by cutting a surface of the case and a second region connected to a surface of the case, and a sealing member covering the first region, wherein the hole cover is lifted from a surface of the case in a direction of an external side of the case and comprises a venting hole in the at least one venting portion, and wherein the sealing member seals the first region to prevent gas from flowing through the first region in a state in which the hole cover covers the venting hole.

2 . The battery device of claim 1 , wherein the venting hole is in a portion surrounded by the first region and the second region when the hole cover is lifted.

3 . The battery device of claim 1 , wherein the hole cover is folded in a direction of an external side of the case with respect to the second region.

4 . The battery device of claim 1 , wherein the sealing member includes a material ignited or melting at 100° C. or higher and 400° C. or lower.

5 . The battery device of claim 1 , wherein the sealing member includes polypropylene (PP) or polyvinyl chloride (PVC).

6 . The battery device of claim 1 , wherein the sealing member opens the first region when a temperature of the sealing member reaches a set temperature or higher or when pressure applied to the sealing member reaches a set pressure.

7 . The battery device of claim 1 , wherein a maximum width of the first region has a value greater than a length of the second region with respect to a direction parallel to the second region.

8 . The battery device of claim 7 , wherein a length of the second region has a value of 0.1 or more and 0.9 or less with respect to a maximum width of the first region.

9 . The battery device of claim 1 , wherein the first region includes a first portion facing the second region with a gap therebetween, a second portion extending from both ends of the first portion toward the second region, and a third portion connecting both ends of the second portion to the second region.

10 . The battery device of claim 1 , wherein the first region includes at least a portion of a quadrangular shape, at least a portion of a circular shape, or at least a portion of an elliptical shape.

11 . The battery device of claim 1 , wherein at least a portion of the second region has a thickness smaller than that of the case.

12 . The battery device of claim 1 , wherein the hole cover and the first region are formed by press-processing the case.

13 . The battery device of claim 1 , wherein the hole cover has a shape lifted in a second direction such that gas passing through the venting hole in a first direction is discharged in the second direction in the state in which the venting hole is open, and the second direction is different from the first direction.

14 . The battery device of claim 1 ,
wherein the case includes an upper plate covering an upper portion of the cell assembly and a side plate covering a side surface of the cell assembly, and wherein the at least one venting portion is disposed on at least one of the upper plate or the side plate.

15 . The battery device of claim 14 ,
wherein the at least one venting portion includes a plurality of venting portions, and wherein the plurality of venting portions are configured such that gas discharged from each of the venting portions is directed in the same direction.

16 . The battery device of claim 14 ,
wherein the at least one venting portion includes a plurality of venting portions, and wherein the plurality of venting portions include a first venting portion disposed in a column, and a second venting portion disposed in a column in a position spaced apart from the first venting portion.

17 . The battery device of claim 16 , wherein a first discharge direction in which gas discharged from the first venting portion is directed and a second discharge direction in which gas discharged from the second venting portion is directed are opposite directions.

18 . The battery device of claim 1 , further comprising:
a busbar assembly including a plurality of busbars electrically connecting the plurality of battery cells to each other, and a connection terminal connecting at least a portion of the plurality of busbars to an external entity, wherein the at least one venting portion is disposed such that gas discharged from each venting portion is not directed toward the connection terminal.

19 . The battery device of claim 1 , further comprising:
a blocking member disposed between the cell assembly and the at least one venting portion and delaying or preventing flames from being discharged through the at least one venting portion.

20 . A battery system, comprising:
a housing including an internal space formed therein; and a plurality of battery devices accommodated in the housing, wherein each of the plurality of battery devices includes: a cell assembly including a plurality of battery cells; a case accommodating the cell assembly; and at least one venting portion in the case to discharge gas generated from the cell assembly to the outside of the case, wherein the at least one venting portion includes a hole cover surrounded by a first region formed by cutting a surface of the case and a second region connected to a surface of the case, and a sealing member covering the first region, and wherein the hole cover is lifted from a surface of the case in a direction of an external side of the case and comprises a venting hole in the at least one venting portion, and wherein the sealing member seals the first region to prevent gas from flowing through the first region in a state in which the hole cover covers the venting hole.

Assignees

• Sk On Co Ltd

Inventors

• Son Jin Woo
• Kim Dong Min
• Na Chae Won
• An Hyo Seong

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/211

  adapted for pouch cells · CPC title

• H01M50/502

  Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing · CPC title

• H01M50/383 Primary

  Flame arresting or ignition-preventing means · CPC title

• H01M50/375

  Vent means sensitive to or responsive to temperature · CPC title