CN-122003781-A - Battery cell, battery pack comprising same and vehicle

Abstract

The battery cell according to an embodiment of the present invention includes an electrode assembly in which a first electrode, a second electrode, and a separator interposed therebetween are wound around a winding shaft to define a core and an outer circumferential surface, the first electrode including a first uncoated portion that is uncoated with an active material layer in a winding direction, a battery case including an opening portion on one side thereof and configured to accommodate the electrode assembly through the opening portion, a battery cell terminal exposed to an outside of the battery case through a closed portion of the battery case located opposite to the opening portion, electrically connected to the first uncoated portion, and having at least one fixing structure in a direction toward the outside of the battery case, and an insulating spacer interposed between the battery case and the battery cell terminal on the closed portion side of the battery case.

Inventors

• ZHAO MINQI
• JIN DUJUN
• ZHANG XIANZHI
• ZHENG QIUJIN
• ZHENG XIANGXI

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260508

Application Date

20250304

Priority Date

20240624

Claims (15)

1. 1. A battery cell, the battery cell comprising: An electrode assembly in which a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode are wound around a winding shaft to define a core portion and an outer circumferential surface, wherein the first electrode includes a first uncoated portion that is uncoated with an active material layer along a winding direction; a battery case including an opening on one side and configured to accommodate the electrode assembly through the opening; a battery cell terminal passing through a closed portion of the battery case positioned on an opposite side of the opening and exposed to an outside of the battery case, the battery cell terminal being electrically connected with the first uncoated portion and having at least one fixing structure disposed in a direction facing the outside of the battery case, and And an insulating gasket interposed between the battery case and the battery cell terminal on the closed portion side of the battery case.
2. 2. The battery cell of claim 1, Wherein the fixing structure is configured to prevent the cell terminal from rotating in a circumferential direction.
3. 3. The battery cell of claim 1, Wherein, fixed knot constructs including towards the sunken sculpture recess in the inside of electric core terminal.
4. 4. The battery cell according to claim 3, Wherein the cross section of the engraved groove is configured in a polygonal shape.
5. 5. The battery cell of claim 1, Wherein, fixed knot constructs the center department that sets up at the electric core terminal.
6. 6. The battery cell of claim 1, Wherein, the fixed structure includes a plurality of sculpture recesses.
7. 7. The battery cell of claim 1, Wherein, the electric core terminal includes: A terminal exposing portion exposed to an outside of the battery case; A terminal insertion part passing through the closing part of the battery case and positioned inside the battery case, and And a terminal connection part connecting the terminal exposure part and the terminal insertion part and passing through the battery case.
8. 8. The battery cell according to claim 7, Wherein the diameter of the terminal exposing portion is configured to be greater than or equal to the diameter of the terminal inserting portion.
9. 9. The battery cell according to claim 7, Wherein the diameter of the terminal insertion portion is configured to be at least twice larger than the diameter of the terminal connection portion.
10. 10. The battery cell according to claim 7, Wherein the axial thickness of the terminal insertion portion is configured to be smaller than the axial thickness of the terminal exposure portion.
11. 11. The battery cell according to claim 7, Wherein the terminal insertion portion is arranged in parallel with the terminal exposure portion.
12. 12. The battery cell according to claim 7, Wherein, the insulating spacer includes: A gasket exposure portion interposed between the terminal exposure portion and the battery case, and And a gasket insertion portion interposed between the terminal insertion portion and the battery case.
13. 13. The battery cell of claim 12, Wherein the diameter of the spacer insertion portion is configured to be greater than or equal to the diameter of the terminal insertion portion.
14. 14. A battery pack comprising at least one battery cell according to any one of claims 1 to 13.
15. 15. A vehicle comprising at least one battery pack according to claim 14.

Description

Battery cell, battery pack comprising same and vehicle Technical Field The present disclosure relates to a battery cell, a battery pack including the battery cell, and a vehicle. The present application is based on and claims priority of korean patent application No. 10-2024-0082170, which was filed 24 at 6 months of 2024, and korean patent application No. 10-2025-0026699, which was filed 28 at 2 months of 2025, which are incorporated herein by reference in their entirety. Background The secondary battery has high applicability according to product categories and has electrical characteristics such as high energy density, which is commonly applied not only to portable devices but also to Electric Vehicles (EVs) or hybrid vehicles (HEVs) driven with electric power sources. Such secondary batteries have not only the main advantage of greatly reducing the use of fossil fuels, but also the generation of byproducts due to the use of energy, and thus have been attracting attention as a novel energy source for improving the eco-friendliness and energy efficiency. Depending on the charge and discharge capacity of the battery pack required for an Electric Vehicle (EV) or a Hybrid Electric Vehicle (HEV), a plurality of battery cells are connected in series/parallel to constitute the battery pack. At this time, it is common to first configure a battery module including at least one battery cell and then configure a battery pack or a battery rack by adding other components using the at least one battery module. Alternatively, in recent years, a battery pack in the form of a cell to pack (cell to pack) in which a plurality of battery cells are directly stored in a battery pack case or the like without being modularized is also being manufactured. Meanwhile, in the conventional battery cell, an electrode terminal electrically connected to the first electrode is riveted and connected to a through hole formed in a closed portion of a battery case electrically connected to the second electrode. Specifically, after the electrode terminal is inserted into the through-hole, a portion for caulking is inserted from the opening side of the case to press the inside of the electrode terminal against the inner surface of the closed surface of the case. At this time, a process of pressing the inner portion of the electrode terminal toward the outside in the circumferential direction should be performed, and it is difficult to form a flat surface on the electrode terminal, so that it is difficult to maximize the area of the electrode terminal coupled to the current collector. Therefore, the electrode terminal may be riveted using a spinning method. The spinning method is a method of pressing the inside of the electrode terminal toward the inner surface of the closed surface of the case by applying a rotational force to a position to be riveted. However, when the circular electrode terminal in the conventional cylindrical battery is riveted, the electrode terminal may not be fixed, and thus there is a problem in that the riveting process cannot be performed using the spinning method. Disclosure of Invention Technical problem The present disclosure is designed to solve the above-described problems, and thus the present disclosure aims to improve productivity or workability in manufacturing of battery cells. In addition, the present disclosure relates to improving weld quality by maximizing the area where the terminal is coupled to the current collector. Furthermore, the present disclosure relates to improving the energy density of battery cells. However, technical problems to be solved by the present disclosure are not limited to the above-described problems, and other problems not mentioned herein will be clearly understood by those of ordinary skill in the art from the following description of the present disclosure. Technical proposal A battery cell according to one embodiment of the present disclosure for solving the above-described problems includes an electrode assembly in which a first electrode, a second electrode, and a separator interposed therebetween are wound around a winding shaft to define a core and an outer circumferential surface, wherein the first electrode includes a first uncoated portion that is not coated with an active material layer along a winding direction, a battery case including an opening on one side and configured to accommodate the electrode assembly through the opening, a cell terminal passing through a closed portion of the battery case positioned on an opposite side of the opening and exposed to an outside of the battery case, the cell terminal being electrically connected with the first uncoated portion and having at least one fixing structure disposed in a direction facing the outside of the battery case, and an insulating spacer interposed between the battery case and the cell terminal on the closed portion side of the battery case. In one aspect of the present disclosure, the fixing structure may