CN-122000643-A - Collector plate and battery cell comprising same

Abstract

The present disclosure relates to a collector plate and a cell including the collector plate, and the collector plate according to one embodiment may include a protrusion space formed by protrusion of a protrusion surface, a protrusion opening defining an entrance of the protrusion space, the protrusion opening having an area larger than an area of the protrusion surface, a connection surface including an inner side surface of the protrusion space, a base surface including surfaces other than the protrusion surface and the connection surface, and a plurality of slits.

Inventors

• Pu Chengcai
• Zhu Shengxun
• GUO CHENGHAO
• PU BINGJUN
• LI DONGHUI
• ZHENG HUIMIN

Assignees

• SK新能源株式会社

Dates

Publication Date

20260508

Application Date

20251105

Priority Date

20241108

Claims (20)

1. 1. A collector plate in the shape of a disk with a raised surface including a central axis, the collector plate comprising: A bulge space formed by bulge of the bulge surface; Long Qikai mouths defining an inlet to the raised space, the area of the raised opening being greater than the area of the raised face; A connection surface including an inner side surface of the bulge space; A base surface including a surface other than the raised surface and the connection surface, and A plurality of slits.
2. 2. The collector plate according to claim 1, wherein, The raised surface and the base surface are parallel to each other.
3. 3. The collector plate according to claim 1, wherein, The collector plate includes aluminum.
4. 4. The collector plate according to claim 1, wherein, The thickness of the collector plate is 0.3mm to 0.6mm.
5. 5. The collector plate according to claim 1, wherein, The ridge height of the ridge space is 0.1mm to 3.0mm.
6. 6. The collector plate according to claim 1, comprising: a first region, which is circular, and on the raised surface, takes the central shaft as the center and has a preset first radius; A second region having a ring shape, an inner diameter with a predetermined second radius and an outer diameter with a predetermined third radius on the base surface centering on the central axis, and A third region including a region other than the first region and the second region, The plurality of slits are formed at predetermined intervals in the third region along the circumferential direction of the ridge space.
7. 7. The collector plate according to claim 6, wherein, The second radius is greater than the first radius.
8. 8. The collector plate according to claim 6, wherein, The third radius is greater than the second radius.
9. 9. The collector plate according to claim 6, wherein, The plurality of slits are formed in an area of 10% or less of the total area of the third region.
10. 10. The collector plate according to claim 6, wherein, The number of the plurality of slits is 4.
11. 11. The collector plate according to claim 6, further comprising: And a bridge portion formed between a pair of slits adjacent to each other in the third region, and connecting the first region and the second region.
12. 12. The collector plate according to claim 11, wherein, The bridge portion includes at least one virtual path that avoids the plurality of slits in the third region and connects the first region and the second region at a shortest distance.
13. 13. The collector plate according to claim 11, wherein, The bridge portion includes: a first boundary contiguous with the periphery of the first region, and A second boundary contiguous with an inner periphery of the second region, At least one of the widths of the bridge portions defined in the circumferential direction of the first region is greater than the length of the first boundary while being greater than the length of the second boundary.
14. 14. A battery cell, comprising: the collector plate according to claim 1; A housing having an accommodation space therein; an electrode terminal penetrating at least a portion of the case, and An electrode assembly wound around a winding shaft as a center and electrically connected to the collector plate, The electrode assembly and the collector plate are received in the receiving space, The raised surface of the collector plate is connected to the electrode terminal, and the base surface of the collector plate is connected to the electrode assembly.
15. 15. The cell of claim 14, wherein, The collector plate comprises a first area, a second area, a third area, a fourth area and a fourth area, wherein the first area is round, the first area is provided with a preset first radius on the raised surface by taking the central shaft as the center, The electrode terminal is connected to the collector plate in the first region.
16. 16. The cell of claim 14, wherein, The electrode assembly includes: a first electrode including a first uncoated portion; a second electrode including a second uncoated portion, and A separator disposed between the first electrode and the second electrode, The first uncoated portion is connected to the base surface.
17. 17. The cell of claim 16, wherein, The collector plate comprises a second area, a second end surface, a first end surface and a second end surface, wherein the second area is annular, takes the central shaft as a center, has an inner diameter with a preset second radius and an outer diameter with a preset third radius on the base surface, The first uncoated portion is connected to the collector plate in the second region.
18. 18. The cell of claim 15, wherein, At least one first weld is formed on the first region, The electrode terminal is welded to the collector plate at the first welded portion.
19. 19. The cell of claim 17, wherein, At least one second weld is formed on the second region, The first uncoated portion is welded to the collector plate at the second welded portion.
20. 20. The cell of claim 19, wherein, The second welding part is formed in plurality, The plurality of second welded portions are formed radially in the second region.

Description

Collector plate and battery cell comprising same Technical Field The present disclosure relates to a collector plate and a battery cell including the collector plate. In more detail, the present disclosure relates to a current collecting plate having improved mechanical rigidity and a battery cell having improved safety by including the same. Background The secondary battery is a battery that stores electric energy by converting it into chemical energy and can be repeatedly used a plurality of times by charging and discharging, and in order to obtain desired output and performance, a plurality of secondary batteries may be grouped and manufactured into a battery pack to be used. Such a battery assembly may include a plurality of secondary batteries, i.e., a plurality of electric cells, in the internal accommodating space as described above. The secondary batteries may be classified into can-type secondary batteries and pouch-type secondary batteries according to the shape of the case. Also, can-type secondary batteries may be further classified into cylindrical secondary batteries and prismatic secondary batteries according to the shape of a can (or case). On the other hand, if the mechanical rigidity of each cell constituting the battery assembly is not sufficiently ensured, the internal components of the cells may be deteriorated or damaged by vibration, impact, or the like applied from the outside of the battery assembly. Such degradation or damage may cause an electrical short circuit or the like, and may cause a safety problem such as internal fire. Disclosure of Invention First, the technical problem to be solved According to an aspect of the present disclosure, a collector plate having improved mechanical rigidity, particularly impact resistance against external force, and a battery cell including the collector plate may be provided. According to another aspect of the present disclosure, a cell with improved safety may be provided. On the other hand, the disclosure can be widely applied to the Green Technology (Green Technology) fields of electric vehicles (ELECTRIC VEHICLE), battery charging stations (Battery Charging Station), energy storage devices (Energy Storage System, ESS) and other solar Power generation (Photovoltaics), wind Power generation (windpower) and the like which utilize batteries. In addition, the present disclosure can also be used for environmental protection (mobile) vehicles (including electric vehicles and Hybrid (Hybrid) vehicles) and the like that prevent climate change by suppressing atmospheric pollution and greenhouse gas emissions. (II) technical scheme The current collecting plate according to the present disclosure is a Disc (Disc) -shaped current collecting plate having a raised surface including a central axis, and may include a raised space formed by the raised surface being raised, a raised opening defining an entrance of the raised space, the raised opening having an area larger than an area of the raised surface, a connection surface including an inner side surface of the raised space, a base surface including surfaces other than the raised surface and the connection surface, and a plurality of slits. According to the current collecting plate of one embodiment, the raised surface and the base surface may be parallel to each other. According to one embodiment, the collector plate may comprise aluminum. According to one embodiment, the collector plate may have a thickness of 0.3mm to 0.6mm. According to the current collector plate of one embodiment, the protrusion height of the protrusion space may be 0.1mm to 3.0mm. The current collecting plate according to an embodiment 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 an inner diameter of a predetermined second radius and an outer diameter of a predetermined third radius on the base surface centered on the central axis, and a third region including regions other than the first region and the second region, and the plurality of slits may be formed at predetermined intervals in the third region along a circumferential direction of the raised space. According to one embodiment of the current collector plate, the second radius may be greater than the first radius. According to one embodiment of the current collector plate, the third radius may be greater than the second radius. According to the collector plate of one embodiment, the plurality of slits may be formed in an area of 10% or less of the total area of the third region. According to the current collecting plate of one embodiment, the number of the plurality of slits may be 4. The collector plate according to one embodiment may further include a bridge portion formed between adjacent pairs of slits among the plurality of slits in the third region and connecting the first region and the second region. According to the current collect