EP-4738568-A1 - BATTERY DEVICE

EP4738568A1EP 4738568 A1EP4738568 A1EP 4738568A1EP-4738568-A1

Abstract

A battery device includes a cell assembly in which a plurality of battery cells are arranged in a first direction, a case having an accommodation space in which the cell assembly may be accommodated, and a surface pressure member providing surface pressure to the cell assembly, wherein the case may include a partition partitioning the accommodation space, and the surface pressure member accommodates the partition and may be coupled to the partition.

Inventors

HONG, SUNG MIN
CHOI, YANG KYU
PARK, SUNG WAN
LEE, JONG HWA
RHEE, SEO ROH
CHO, JUN HUI
CHOI, KEUN WOO

Assignees

SK On Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20250806

Claims (13)

A battery device comprising: a cell assembly in which a plurality of battery cells are arranged in a first direction; a case having an accommodation space in which the cell assembly is accommodated; and a surface pressure member providing surface pressure to the cell assembly, wherein the case includes a partition partitioning the accommodation space, and the surface pressure member accommodates the partition and is coupled to the partition.
The battery device of claim 1, wherein the surface pressure member includes: a base plate disposed above the partition; and a pressing portion extending from the base plate and disposed to face both sides of the partition, wherein the pressing portion elastically presses a side surface of the cell assembly.
The battery device of claim 2, wherein the pressing portion includes: a pressing plate disposed to be spaced apart from the partition by a certain distance and pressing the cell assembly; a support portion bent from a lower end of the pressing plate and contacting the partition; and a connecting plate connecting the pressing plate to the base plate.
The battery device of claim 1, wherein the surface pressure member is formed by bending a single metal plate.
The battery device of any one of claims 3 to 4, wherein the surface pressure member includes: a first bend line through which the base plate is connected to the connecting plate; and a second bend line through which the pressing plate is connected to the connecting plate, wherein the first bend line and the second bend line are formed to be parallel to a length direction of the partition.
The battery device of any one of claims 3 to 5, wherein the base plate is disposed parallel to an upper surface of the partition, and the pressing plate is disposed parallel to a side surface of the partition.
The battery device of any one of claims 3 to 6, wherein the base plate and the pressing plate are arranged to be perpendicular to each other.
The battery device of any one of claims 3 to 7, wherein only the support portion of the surface pressure member contacts the partition.
The battery device of any one of claims 3 to 8, further comprising: a deformation-suppressing member disposed between the pressing plate and the partition to limit deformation of the pressing plate, wherein a thickness of the deformation-suppressing member is formed to be less than a gap between the pressing plate and the partition.
The battery device of any one of claims 3 to 9, further comprising: a stopper formed to protrude from a lower end portion of a side surface of the partition, wherein the support portion is restrained from moving downwardly by the stopper.
The battery device of claim 10, further comprising: a protrusion formed to protrude from an upper end portion of the side surface of the partition, wherein the protrusion is disposed to contact the connecting plate.
The battery device of claim 11, further comprising a fastening member tightly attaching the base plate to an upper surface of the partition and fastened to the partition.
The battery device of claim 12, wherein the pressing plate is pressed in a direction away from the partition as the base plate is closer to the upper surface of the partition.

Description

TECHNICAL FIELD The disclosure relates to a battery device having a surface pressure member. BACKGROUND Unlike primary batteries, secondary batteries may be charged and discharged and may be applied to devices within various fields, such as digital cameras, mobile phones, laptops, and hybrid vehicles. Examples of secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-hydrogen batteries, and lithium secondary batteries. Among secondary batteries, research has been actively conducted on lithium secondary batteries with high energy density and discharge voltage, and recently, lithium secondary batteries have been manufactured as flexible pouch-type battery cells and battery devices have been manufactured in the form of modules by connecting a plurality of secondary batteries. In the case of arranging a plurality of battery cells in one case, if one of the battery cells expands, the surface pressure thereof may not be evenly applied to the other battery cells and such a surface pressure deviation may cause deterioration of the battery cells. SUMMARY The present disclosure may be implemented in some embodiments to provide a battery device in which surface pressure is provided to a battery cell. The battery device of the present disclosure may be widely applied to devices within green technology fields, such as electric vehicles, battery charging stations, and solar power generation and wind power generation using batteries. In addition, the battery case of the present disclosure may be used in eco-friendly electric vehicles, hybrid vehicles, etc. to prevent a climate change by suppressing air pollution and greenhouse gas emissions. In some embodiments of the present disclosure, a battery device includes: a cell assembly in which a plurality of battery cells are arranged in a first direction; a case having an accommodation space in which the cell assembly may be accommodated; and a surface pressure member providing surface pressure to the cell assembly, wherein the case includes a partition partitioning the accommodation space, and the surface pressure member accommodates the partition and may be coupled to the partition. The surface pressure member may include: a base plate disposed above the partition; and a pressing portion extending from the base plate and disposed to face both sides of the partition, wherein the pressing portion may elastically press a side surface of the cell assembly. The pressing portion may include: a pressing plate disposed to be spaced apart from the partition by a certain distance and pressing the cell assembly; a support portion bent from a lower end of the pressing plate and contacting the partition; and a connecting plate connecting the pressing plate to the base plate. The surface pressure member may be formed by bending a single metal plate. The surface pressure member may include: a first bend line through which the base plate may be connected to the connecting plate; and a second bend line through which the pressing plate may be connected to the connecting plate, wherein the first bend line and the second bend line may be formed to be parallel to a length direction of the partition. The base plate may be disposed parallel to an upper surface of the partition, and the pressing plate may be disposed parallel to a side surface of the partition. The base plate and the pressing plate may be arranged to be perpendicular to each other. Only the support portion of the surface pressure member may contact the partition. The battery device may further include: a deformation-suppressing member disposed between the pressing plate and the partition to limit deformation of the pressing plate, wherein a thickness of the deformation-suppressing member is formed to be less than a gap between the pressing plate and the partition. The battery device may further include: a stopper formed to protrude from a lower end portion of a side surface of the partition, wherein the support portion is restrained from moving downwardly by the stopper. The battery device may further include: a protrusion formed to protrude from an upper end portion of the side surface of the partition, wherein the protrusion is disposed to contact the connecting plate. The battery device may further include: a fastening member tightly attaching the base plate to an upper surface of the partition and fastened to the partition. The pressing plate may be pressed in a direction away from the partition as the base plate is closer to the upper surface of the partition. In some embodiments of the present disclosure, a battery device includes: a cell assembly in which a plurality of battery cells may be arranged in a first direction; a case having an accommodation space in which the cell assembly may be accommodated; and a surface pressure member coupled to a partition partitioning the accommodation space, wherein the surface pressure member includes two pressing portions respectively disposed on bo