EP-4742383-A1 - CURRENT COLLECTOR PLATE, AND BATTERY CELL COMPRISING THE SAME

EP4742383A1EP 4742383 A1EP4742383 A1EP 4742383A1EP-4742383-A1

Abstract

The present disclosure relates to a current collector plate and a battery cell including the same. A current collector plate according to one embodiment of the present disclosure is a disc-shaped current collector plate having a raised surface including a central axis, wherein the current collector plate may include: a raised space formed by the raised surface being raised; a raised opening defining an entrance of the raised space, the area of the raised opening being larger than the area of the raised surface; a connecting surface including an inner surface of the raised space; a base surface including a surface other than the raised surface and the connecting surface; and a plurality of slits.

Inventors

PARK, Seong Che
JU, SEUNG HOON
KWAK, SEUNG HO
PAK, BYEONG JUN
LEE, Dong Hyee
CHEONG, HOEMIN

Assignees

SK On Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20251106

Claims (15)

A current collector plate having a disc shape with a raised surface including a central axis, wherein the current collector plate comprises: a raised space formed by the raised surface being raised; a raised opening defining an entrance of the raised space and having an area larger than an area of the raised surface; a connecting surface including an inner surface of the raised space; a base surface including a surface other than the raised surface and the connecting surface; and a plurality of slits.
The current collector plate according to claim 1, wherein the raised surface and the base surface are parallel to each other.
The current collector plate according to claim 1 or 2, wherein the current collector plate includes aluminum.
The current collector plate according to any one of claims 1 to 3, wherein the current collector plate has a thickness of 0.3 mm to 0.6 mm.
The current collector plate according to any one of claims 1 to 4, wherein the raised height of the raised space is 0.1 mm to 3.0 mm.
The current collector plate according to any one of claims 1 to 5, comprising: a first region having a circular shape with a predetermined first radius on the raised surface centered on the central axis; a second region having a ring shape with a predetermined inner diameter of a second radius and a predetermined outer diameter of a third radius on the base surface centered on the central axis; and a third region including an area other than the first region and the second region, wherein the plurality of slits are formed in the third region at predetermined intervals along a circumferential direction of the raised space, preferably the number of the plurality of slits is four.
The current collector plate according to claim 6, wherein (a) the second radius is greater than the first radius, and/or (b) the third radius is greater than the second radius.
The current collector plate according to claim 6 or 7, wherein the plurality of slits are formed in an area equal to or less than 10% of the total area of the third region.
The current collector plate according to any one of claims 6 to 8, further comprising a bridge portion formed on the third region between a pair of adjacent slits among the plurality of slits, the bridge portion connecting the first region and the second region, preferably, the bridge portion includes at least one virtual path connecting the first region and the second region at the shortest distance on the third region while avoiding the plurality of slits.
The current collector plate according to claim 9, wherein the bridge portion includes a first boundary in contact with a circumference of the first region and a second boundary in contact with an inner circumference of the second region, and at least one of widths of the bridge portion defined along a circumferential direction of the first region is longer than a length of the first boundary and simultaneously longer than a length of the second boundary.
A battery cell comprising: a current collector plate according to any one of claims 1 to 10; a case having an accommodation space therein; an electrode terminal penetrating at least a portion of the case; and an electrode assembly wound around a winding axis and electrically connected to the current collector plate, wherein the electrode assembly and the current collector plate are accommodated in the accommodation space, and wherein the raised surface of the current collector plate is connected to the electrode terminal, and the base surface of the current collector plate is connected to the electrode assembly.
The battery cell according to claim 11, wherein the current collector plate includes a first region having a circular shape with a predetermined first radius on the raised surface centered on the central axis, and the electrode terminal is connected by being coupled to the current collector plate at the first region, preferably, at least one first welded portion is formed on the first region, and the electrode terminal is welded and joined to the current collector plate at the first welded portion.
The battery cell according to claim 11, wherein the electrode assembly includes a first electrode including a first non-coating portion, a second electrode including a second non-coating portion, and a separator disposed between the first electrode and the second electrode, and the first non-coating portion is connected to the base surface.
The battery cell according to claim 13, wherein the current collector plate includes a second region having a ring shape with a predetermined inner diameter of a second radius and a predetermined outer diameter of a third radius on the base surface centered on the central axis, and the first non-coating portion is connected by being coupled to the current collector plate at the second region.
The battery cell according to claim 13 or 14, wherein at least one second welded portion is formed on the second region, preferably a plurality of second welded portions are formed, and the plurality of second welded portions are formed radially on the second region, and the first non-coating portion is welded and joined to the current collector plate at the second welded portion.

Description

BACKGROUND OF THE INVENTION 1. Field The present disclosure relates to a current collector plate and a battery cell including the same. More particularly, the present disclosure relates to a current collector plate having improved mechanical rigidity and a battery cell including the same, thereby improving safety. 2. Description of the Related Art A secondary battery is a battery configured to convert electrical energy into chemical energy for storage and to be reused multiple times through charging and discharging. To obtain desired output and performance, a plurality of such secondary batteries may be grouped and manufactured as a battery assembly. The battery assembly may include, within an internal accommodation space, a plurality of secondary batteries, that is, a plurality of battery cells. The secondary batteries may be classified into a can-type secondary battery and a pouch-type secondary battery according to the shape of a case. The can-type secondary battery may further be classified into a cylindrical secondary battery and a prismatic secondary battery according to the form of the can (or case). Meanwhile, when the mechanical rigidity of each battery cell constituting the battery assembly is insufficiently secured, internal components of the battery cell may deteriorate or be damaged by vibration or impact applied from the outside of the battery assembly. Such deterioration or damage may cause an electrical short circuit, leading to safety issues such as internal ignition. SUMMARY OF THE INVENTION According to one aspect of the present disclosure, a current collector plate having improved mechanical rigidity, particularly enhanced impact resistance against external force, and a battery cell including the same may be provided. According to another aspect of the present disclosure, a battery cell with improved safety may be provided. Meanwhile, the present disclosure may be widely applied in the fields of green technology, such as electric vehicles, battery charging stations, and energy storage systems (ESS), as well as photovoltaic power generation and wind power generation utilizing batteries. In addition, the present disclosure may be used in eco-friendly mobility, including electric vehicles and hybrid vehicles, for preventing climate change by reducing air pollution and greenhouse gas emissions. As a technical means to achieve the technical objects, a current collector plate according to the present disclosure is a disc-shaped current collector plate having a raised surface including a central axis, wherein the current collector plate may comprise: a raised space formed by the raised surface being raised; a raised opening defining an entrance of the raised space, the area of the raised opening being larger than the area of the raised surface; a connecting surface including an inner surface of the raised space; a base surface including a surface other than the raised surface and the connecting surface; and a plurality of slits. In the current collector plate according to one embodiment, the raised surface and the base surface may be parallel to each other. In the current collector plate according to one embodiment, the current collector plate may include aluminum. In the current collector plate according to one embodiment, the thickness may be 0.3 mm to 0.6 mm. In the current collector plate according to one embodiment, the raised height of the raised space may be 0.1 mm to 3.0 mm. In the current collector plate according to one embodiment, the current collector plate may include a first region having a circular shape with a predetermined first radius on the raised surface centered on the central axis; a second region having a ring shape with a predetermined inner diameter of a second radius and a predetermined outer diameter of a third radius on the base surface centered on the central axis; and a third region including an area other than the first region and the second region, wherein the plurality of slits may be formed in the third region at predetermined intervals along a circumferential direction of the raised space. In the current collector plate according to one embodiment, the second radius may be greater than the first radius. In the current collector plate according to one embodiment, the third radius may be greater than the second radius. In the current collector plate according to one embodiment, the plurality of slits may be formed in an area equal to or less than 10% of the total area of the third region. In the current collector plate according to one embodiment, the number of the plurality of slits may be four. In the current collector plate according to one embodiment, a bridge portion may further be formed on the third region between a pair of adjacent slits among the plurality of slits, the bridge portion connecting the first region and the second region. In the current collector plate according to one embodiment, the bridge portion may include at least one virtual path con