KR-20260065343-A - Battery cell, battery pack and vehicle including the same

KR20260065343AKR 20260065343 AKR20260065343 AKR 20260065343AKR-20260065343-A

Abstract

A battery cell according to the present invention comprises: an electrode assembly provided by being wound around a winding axis with a separator interposed between a first electrode having a first polarity and a second electrode having a second polarity; a can housing in which the electrode assembly is received; a first terminal having a first polarity disposed on one side of the can housing; a second terminal having a second polarity disposed on one side of the can housing; and a first current collector plate disposed on the other side of the can housing and electrically connected to the second electrode and the second terminal, wherein the first current collector plate has at least one extension portion that extends to one side and is insulated from the first terminal.

Inventors

손종인
김민우
이관희

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (14)

An electrode assembly provided by being wound around a winding axis with a separator interposed between a first electrode having a first polarity and a second electrode having a second polarity; A can housing in which the above electrode assembly is accommodated; A first terminal disposed on one side of the above-mentioned can housing and having a first polarity; A second terminal disposed on one side of the above-mentioned can housing and having a second polarity; and It includes a first current collector plate disposed on the other side of the can housing and electrically connected to the second electrode and the second terminal, The above-mentioned first collector plate is, A battery cell characterized by having at least one extension portion that extends to one side and is insulated from the first terminal.
In paragraph 1, The above-mentioned first collector plate is, It is provided with an electrode coupling part coupled to the second electrode above, and The above extension part is, A battery cell characterized by being formed extending from the outermost edge of the electrode coupling portion.
In paragraph 2, The above extension part is, A battery cell characterized by being integrally formed with the electrode coupling portion.
In paragraph 1, The above extension part is, A battery cell characterized by being provided in multiple units.
In paragraph 1, The above extension part is, A battery cell characterized by being welded to the inner surface of the can housing.
In paragraph 5, The above extension part is, A battery cell characterized by being spaced apart from the electrode assembly during the process of welding to the inner surface of the can housing.
In paragraph 1, The above extension part is, A battery cell characterized by being placed in close contact with the inner surface of the can housing by the expansion of the electrode assembly.
In paragraph 1, A first blackout portion is provided at one end of the first electrode, and A second blank portion is provided at the other end of the second electrode, and The above extension part is, A battery cell characterized by not coming into contact with the first non-contact portion and extending to an area adjacent to the first non-contact portion.
In paragraph 8, In the first electrode above, An insulating coating portion is laminated at the boundary region of the first non-retaining portion and the first retaining portion, and The above extension part is, A battery cell characterized by extending to the above-mentioned insulating coating portion.
In paragraph 8, It further includes an insulator configured to insulate the first waterproof section and the can housing from each other, The above extension part is, A battery cell characterized by extending to the above-mentioned insulator.
In paragraph 1, The above extension part is, A battery cell characterized by being provided in a cylinder shape.
In paragraph 1, The above-mentioned first collector plate is, A battery cell characterized by not protruding toward the other side.
A battery pack characterized by including at least one battery cell according to any one of claims 1 to 12.
An automobile characterized by including at least one battery pack according to Clause 13.

Description

Battery cell, battery pack and vehicle including the same The present invention relates to a battery cell, a battery pack, and a vehicle including the same, and more specifically, to a battery cell, a battery pack, and a vehicle including the same that can drastically reduce the length of the current path. Recently, as the demand for portable electronic products such as laptops, video cameras, and mobile phones has increased rapidly, and the development of electric vehicles, energy storage batteries, robots, and satellites has accelerated, research on high-performance secondary batteries capable of repeated charging and discharging is actively underway. Currently commercialized rechargeable batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to freely charge and discharge with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density. These lithium-ion secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. Additionally, the lithium-ion secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing that seals and encloses the electrode assembly together with an electrolyte. Lithium-ion rechargeable batteries can be classified according to the shape of the battery case into pouch-type rechargeable batteries, in which the electrode assembly is embedded in a pouch made of aluminum laminate sheets, and can-type rechargeable batteries, in which the electrode assembly is embedded in a metal can. Furthermore, can-type rechargeable batteries can be further classified into cylindrical batteries and prismatic batteries depending on the shape of the metal can. These lithium-ion rechargeable batteries are utilized as battery modules or battery packs, which are assembled into a dense structure by overlapping or stacking multiple battery cells—either directly or mounted in cartridges—and then electrically connected to provide high voltage and high current. Meanwhile, conventional cylindrical secondary batteries included an electrode assembly wound with a separator interposed between electrodes of different polarities and a can housing that accommodated the same. Such conventional cylindrical secondary batteries had a structure in which the can housing had a negative polarity and a positive terminal in the form of a rivet was disposed on the upper part of the can housing, so that both the negative and positive terminals were provided on the upper part of the can housing. However, conventional cylindrical secondary batteries had a limitation in that the length of the current path from the negative electrode current collector to the upper part of the can housing was long because the negative electrode current collector was positioned on the lower side of the electrode assembly. Furthermore, if the total height of the can housing was increased to increase the energy capacity of the secondary battery, the length of the current path could become even longer. Therefore, there is an urgent need to develop a battery cell that can drastically reduce the length of the current path. The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a perspective view showing the overall external appearance of a battery cell according to one embodiment of the present invention. FIG. 2 is a side cross-sectional view showing the interior of a battery cell according to one embodiment of the present invention. FIG. 3 is a perspective view showing the appearance of a first current collector plate according to one embodiment of the present invention. FIG. 4 is an enlarged side cross-sectional view showing an extension being welded to a can housing inside a battery cell according to one embodiment of the present invention. FIG. 5 is an enlarged side cross-sectional view showing the extension portion being in close contact with the can housing by the expansion of the electrode assembly inside the battery cell according to one embodiment of the present invention. FIG. 6 is an unfolded view of the first electrode and the second electrode according to one embodiment of the present invention. FIG. 7 is an enlarged side cross-sectional view showing the extension portion extending to the position immediately preceding the first portion inside a battery c