KR-20260062797-A - BATTERY CELL AND MAUNUFACTURING METHOD OF BATTERY CELL

KR20260062797AKR 20260062797 AKR20260062797 AKR 20260062797AKR-20260062797-A

Abstract

A battery cell according to an embodiment of the present disclosure comprises: an electrode assembly including a positive plate, a separator, and a negative plate; a can in which the electrode assembly is received and which is electrically connected to the negative plate; a current collector extending from the positive plate; a rivet having a rivet hole partially disposed inside the can and electrically connected to the positive plate, which exposes the current collector to the outside of the can; and a sealer configured to seal the can by blocking the rivet hole, wherein the sealer may include a plurality of welded regions spaced apart from each other in the radial direction of the sealer; and a through passage formed by a laser penetrating each of the plurality of welded regions.

Inventors

오경택
노지원
정석훈
천동준

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20250612
Priority Date: 20241029

Claims (14)

Electrode assembly including a positive electrode plate, a separator, and a negative electrode plate; A can that accommodates the above electrode assembly and is electrically connected to the above cathode plate; A current collector plate extending from the above positive plate; A rivet having a rivet hole that is partially disposed inside the can, electrically connected to the positive plate, and exposes the current collector plate to the outside of the can; and It includes a sealer configured to seal the can by blocking the rivet hole, and The above sealer is, A plurality of welded regions spaced apart from each other in the radial direction of the sealer; and A battery cell comprising a penetrating passage formed by a laser penetrating each of the plurality of welding regions.
In Article 1, The above sealer is, A body disposed inside the above rivet hole; and It includes a head that extends from the body toward the outside of the rivet hole with a diameter larger than that of the body, and includes a first head surface facing the outside of the rivet and a second head surface facing the inside of the rivet. At least a portion of the above through passage is a battery cell formed between the first head surface and the second head surface.
In Article 1, The above plurality of welding areas are, The edge in contact with the above rivet; and It includes a plurality of core portions spaced radially inward from the edge of the sealer, and The above penetrating passage is, A first through passage formed at the above edge and having a first size; and A battery cell comprising a second through passage formed in the plurality of core portions and having a second size smaller than the first size.
In Article 1, At least a portion of the electrode assembly is a battery cell positioned to overlap with the rivet hole in the longitudinal direction of the battery cell.
In Article 1, The above sealer is, A head having a first diameter; and It includes a body having a second diameter smaller than the first diameter, and The rivet hole of the above rivet is, A battery cell comprising a first space exposed to the outside of the can and in which the head is located, a second space in which the body is located and in which the body is located, and a third space in which at least a portion of the welded portion where the current collector plate and the rivet are welded is located and in which the current collector plate is welded and the body is located.
In Article 1, The above rivet is, It includes a seating portion configured to allow the above sealer to be seated, and The above penetrating passage is, A penetrating portion formed by penetrating the above sealer; and A battery cell comprising an extended portion extending from the above penetration portion to pass through the joint surface of the above seating portion.
In Article 1, The above rivet is, Surrounding the edge of the sealer and including a terminal portion exposed to the outside of the can, The above-mentioned penetrating passage is a battery cell comprising a first penetrating passage formed by a laser penetrating the edge of the sealer that contacts the terminal portion.
In Article 1, The above sealer is, A battery cell comprising a chamfer that faces the inner surface of the rivet forming the rivet hole and guides the sealer to be inserted into the interior of the rivet hole in the longitudinal direction of the battery cell while facing the inner surface of the rivet.
In Article 1, The head of the sealer mentioned above is, A first head portion having a first thickness; and A battery cell comprising a second head portion provided on the radially outer side of the first head portion, having a second thickness smaller than the first thickness, and configured to be welded with the rivet.
Step of placing a can that accommodates an electrode assembly; A step of inserting at least a portion of a rivet with a rivet hole formed therein into the interior of the can such that the rivet hole is exposed to the outside of the can; A step of sealing the can by inserting a sealer into the rivet hole; A step of performing a first welding of the sealer and the rivet using a laser; and A method for manufacturing a battery cell comprising the step of secondary welding the sealer and the rivet using a laser.
In Article 10, A method for manufacturing a battery cell in which the first voltage in the first welding step is greater than the second voltage in the second welding step.
In Article 10, A method for manufacturing a battery cell in which each of the first welding step and the second welding step is performed on each of a plurality of welding regions spaced apart from each other in the radial direction of the sealer.
In Article 10, A method for manufacturing a battery cell, further comprising the step of butt welding the edge of the sealer in contact with the rivet and the rivet.
In Article 10, The above first welding step and the above second welding step are a method for manufacturing a battery cell that forms a through passage inside the sealer.

Description

Battery Cell and Manufacturing Method of Battery Cell Various embodiments of the present disclosure relate to a battery cell and a method for manufacturing a battery cell. Rechargeable batteries are widely used in portable mobile devices such as digital cameras, mobile phones, and laptops due to their rechargeable and dischargeable capabilities. In particular, with the rapid development of the electrical, electronic, telecommunications, and computer industries in recent years, the demand for high-performance and high-stability rechargeable batteries is increasing even further. Generally, depending on the structure of the electrode assembly, the secondary battery may include a jelly-roll electrode assembly in which long sheet-type positive and negative electrodes are wound with a separator in between, a stack-type electrode assembly in which a plurality of positive and negative electrodes cut into units of a predetermined size are sequentially stacked with a separator in between, and a stack/folding-type electrode assembly in which bicells or full cells in which positive and negative electrodes of a predetermined unit are stacked with a separator in between are wound. In addition, depending on the shape of the battery case, the secondary battery may be composed of a cylindrical secondary battery in which the electrode assembly is embedded in a cylindrical metal can, a prismatic secondary battery in which the electrode assembly is embedded in a prismatic metal can, a pouch-type secondary battery in which the electrode assembly is embedded in a pouch-type case made of an aluminum laminate sheet, etc. Meanwhile, the cylindrical battery places an electrode assembly, including a current collector plate, inside the can. The cylindrical battery includes rivets extending from the current collector plate to the outside of the can for electrical connection with the outside of the can. The electrode assembly placed inside the can is electrically connected to an electrical component placed outside the can through the rivets. In cylindrical batteries, rivets are welded to the current collector plate to secure them to the battery cells. The electrode assembly housed inside the can has a hollow to form a path for the welding rod to pass through for welding the rivets. The electrode assembly of the cylindrical battery may not be able to secure sufficient chargeable capacity due to the size of the hollow. Furthermore, as the length of the electrode assembly increases, the length of the welding rod passing through the hollow inevitably increases as well, making it difficult to weld the current collector plate and the rivet using the elongated rod. FIG. 1 is a conceptual diagram of a battery cell according to an embodiment of the present disclosure. FIG. 2 is a part of a cross-sectional view of a battery cell according to one embodiment of the present disclosure. FIG. 3 is a side view of a rivet according to one embodiment of the present disclosure. FIG. 4 is a side view of a rivet according to one embodiment of the present disclosure. FIG. 5 is a side view of a rivet according to one embodiment of the present disclosure. FIG. 6 is a cross-sectional view of a rivet according to one embodiment of the present disclosure. FIG. 7a is a block diagram illustrating the assembly of a rivet and a sealer according to one embodiment of the present disclosure. FIG. 7b is a block diagram illustrating the assembly of a rivet and a sealer according to one embodiment of the present disclosure. FIG. 8 is a drawing illustrating the assembly of rivets according to one embodiment of the present disclosure. FIG. 9a is a drawing illustrating the structure of a rivet and a sealer according to one embodiment of the present disclosure. FIG. 9b is a drawing illustrating a part of the structure of a rivet and a sealer according to one embodiment of the present disclosure. FIG. 10 is a part of a cross-sectional view of a battery cell according to one embodiment of the present disclosure. FIG. 11 is a conceptual diagram of a battery cell according to one embodiment of the present disclosure. FIG. 12a is a cross-sectional view of a battery cell according to one embodiment of the present disclosure. FIG. 12b is a cross-sectional view of a battery cell according to one embodiment of the present disclosure. Prior to the detailed description of the present invention, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, they should be interpreted in a sense and concept consistent with the technical spirit of the present invention, based on the principle that the inventor may appropriately define the concept of the terms to best describe his invention. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all aspects of the t