US-12626978-B2 - Pouch type rechargeable-battery

US12626978B2US 12626978 B2US12626978 B2US 12626978B2US-12626978-B2

Abstract

A pouch-type secondary battery includes an electrode assembly including a first electrode plate, a separator, and a second electrode plate; and a pouch film in which the electrode assembly is accommodated, wherein the pouch film includes an accommodation portion in which the electrode assembly is accommodated, and a terrace portion extending from the accommodation portion to an outside of the accommodation portion, the terrace portion includes a first side portion through and from which a negative electrode lead connected to the electrode assembly passes and protrudes, a second side portion through and from which a positive electrode lead connected to the electrode assembly passes and protrudes, and an upper end portion having both end portions connected to the first and second side portions, and folding portions folded toward the upper end portion are provided on ends of the first and second side portions.

Inventors

Ho Jin HWANG
Young Ha Kim
Ji Hyung KIM
Sang Bin Lee

Assignees

SK ON CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20220601
Priority Date: 20210929

Claims (5)

1 . A pouch-type secondary battery comprising: an electrode assembly including a first electrode plate, a separator, and a second electrode plate; and a pouch film in which the electrode assembly is accommodated, wherein the pouch film includes an accommodation portion in which the electrode assembly is accommodated, a terrace portion extending from the accommodation portion to an outside of the accommodation portion, wherein the terrace portion includes a first side portion through and from which a negative electrode lead connected to the electrode assembly passes and protrudes, a second side portion through and from which a positive electrode lead connected to the electrode assembly passes and protrudes, and an upper end portion having both end portions connected to the first and second side portions, a bottom surface contacting one side surface of the electrode assembly and disposed on an opposite side of the upper end portion, folding portions folded toward the upper end portion are provided on ends of the first and second side portions, auxiliary folding portions extending from both ends of the bottom surface and connected to the folding portions are provided, and a sealing member disposed between the folding portions and the auxiliary folding portions on an outside surface of the folded pouch film, wherein the sealing member is formed of an adhesive.
2 . The pouch-type secondary battery of claim 1 , wherein the folding portions are folded on an inside of the terrace portion in which the pouch film overlaps.
3 . The pouch-type secondary battery of claim 2 , wherein a longitudinal cross-section of the terrace portion in a region in which each of the folding portions is disposed has a ‘Σ’ shape.
4 . The pouch-type secondary battery of claim 1 , wherein the auxiliary folding portions are folded toward both end portions of the electrode assembly.
5 . The pouch-type secondary battery of claim 1 , wherein a sealing portion sealing the pouch film is provided on the first and second side portions and the upper end portion.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application claims benefit of priority to Korean Patent. Application No. 10-2021-0128770 filed on Sep. 29, 2021 in the Korean intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. BACKGROUND 1. Field The present disclosure relates to a pouch-type rechargeable battery. 2. Description of Related Art A pouch-type secondary battery may be classified as a unidirectional pouch-type secondary battery or a bidirectional pouch-type secondary battery, according to directivity of an electrode lead, and may be classified as a three-sided sealing pouch-type secondary battery or a four-sided sealing pouch-type secondary battery, according to the number of sealing surfaces thereof. Meanwhile, in the three-sided sealing pouch-type secondary battery, both ends of a non-sealing surface may protrude, an arrangement which may be generally known by various names such as a shark-fin, a bat ear, or the like. Meanwhile, a plurality of pouch-type secondary batteries may be accommodated in a case or the like to be manufactured as a secondary battery module and a secondary battery pack. However, when the secondary battery module or the secondary battery pack is manufactured, due to the above-described protrusion, there may be problems in that a volume density thereof is lowered, and, furthermore, cooling efficiency thereof may be lowered. SUMMARY An aspect of the present disclosure is to provide a pouch-type secondary battery removing a protrusion. According to an aspect of the present disclosure, a pouch-type secondary battery includes an electrode assembly including a first electrode plate, a separator, and a second electrode plate; and a pouch film in which the electrode assembly is accommodated, wherein the pouch film includes an accommodation portion in which the electrode assembly is accommodated, and a terrace portion extending from the accommodation portion to an outside of the accommodation portion, the terrace portion includes a first side portion through and from which a negative electrode lead connected to the electrode assembly passes and protrudes, a second side portion through and from which a positive electrode lead connected to the electrode assembly passes and protrudes, and an upper end portion having both end. portions connected to the first and second side portions, and folding portions folded toward The upper end portion are provided on ends of the first and second side portions. The folding portion may be folded on an inside of the terrace portion in which the pouch film overlaps. A longitudinal cross-section of the terrace portion in a region in which each of the folding portions may be disposed may have a ‘Σ’ shape. The pouch film may have a bottom surface contacting one side surface of the electrode assembly and disposed on an opposite side of the upper end portion, and auxiliary folding portions extending from both ends of the bottom surface and connected to the folding portions may be provided. The auxiliary folding portions may be folded toward both end portions of the electrode assembly. A sealing portion sea Thing the pouch film may be provided on the first and second side portions and the upper end portion. A sealing member disposed between the folding portions may be further included. The sealing member may be formed of an adhesive. The sealing member may be an implant for bonding the sealing portion. BRIEF DESCRIPTION OF DRAWINGS The above and other aspects, features, and advantages of the present disclosure will be more clearly understood from the following detailed description, taken in conjunction with the accompanying drawings, in which: FIG. 1 is a perspective view illustrating a pouch-type secondary battery according to an embodiment of the present disclosure. FIG. 2 is an exploded perspective view illustrating a pouch-type secondary battery according to an embodiment of the present disclosure. FIG. 3 is an enlarged view illustrating portion A of FIG. FIG. 4 is a perspective view illustrating a modified embodiment of a pouch-type secondary battery according to an embodiment of the present disclosure. FIG. 5 is an enlarged view illustrating portion B of FIG. DETAILED DESCRIPTION Hereinafter, embodiments of the present disclosure will be described with reference to specific embodiments and the accompanying drawings. However, the embodiments of the present disclosure can be modified to have various other forms, and the scope of the present disclosure is not limited to the embodiments described below. Furthermore, the embodiments of the present disclosure are provided to more full describe the present disclosure to those skilled in the art. Therefore, the shapes and sizes of the elements in the drawings may be exaggerated for clarity of description, and the elements denoted by the same reference numerals in the drawings are the same elements. FIG. 1 is a perspective view illustrating a pouch-type sec