KR-20260063095-A - Sealing part folding device of pouch-type secondary battery

KR20260063095AKR 20260063095 AKR20260063095 AKR 20260063095AKR-20260063095-A

Abstract

The present invention relates to a sealing portion of a pouch-type secondary battery that enables the sealing portion of the pouch-type secondary battery to be folded up to 270 degrees through a single folding device, comprising: a support unit having a support block that is movably arranged and selectively supports the lower surface of the sealing portion of the pouch-type secondary battery that is seated on a stage via lifting; a folding unit having a folding block that is movably arranged on one side of the support unit and pressurizes the sealing portion by sequentially folding it to a set angle while rotating eccentrically while supporting the lower surface of the sealing portion of the pouch-type secondary battery; and a folding guide unit having a diagonal guide and a vertical guide that is movably arranged above the support unit and guides sequential folding points when the sealing portion is folded through the folding unit.

Inventors

김성욱
조현창
문병국
김도현
김민구
정장원

Assignees

주식회사 톱텍

Dates

Publication Date: 20260507
Application Date: 20241030

Claims (12)

In a sealing portion folding device (400) for a pouch-type secondary battery that folds the sealing portion (20) of a pouch-type secondary battery (10), A support unit (100) having a support block (120) that is movably positioned and selectively supports the lower surface of the sealing portion (20) of the pouch-type secondary battery (10) that is seated on the stage (130) via lifting; A folding unit (200) having a folding block (230) which is movably disposed on one side of the support unit (100) and eccentrically rotates while supporting the lower surface of the sealing portion (20) of the pouch-type secondary battery (10) and sequentially folds the sealing portion (20) at a set angle while applying pressure; and A sealing portion folding device for a pouch-type secondary battery, characterized by comprising: a folding guide unit (300) having a diagonal guide (310) and a vertical guide (320) that are movably positioned above the support unit (100) and guide sequential folding points when folding the sealing portion (20) through the folding unit (200).
In paragraph 1, The above support unit (100) is, A first driving unit (110) provided on a moving body (111) that moves in the X-axis direction; A support block (120) positioned on the upper part of a first lifting piece (122) that is connected to the rod of the first driving unit (110) and moves up and down, and selectively supports the lower surface of the sealing part (20) of the pouch-type secondary battery (10) through the lifting; and A sealing portion folding device for a pouch-type secondary battery, characterized by comprising: a stage (130) disposed on one side of the support block (120) and on which the pouch-type secondary battery (10) is seated so that the sealing portion (20) faces the support block (120).
In paragraph 2, A step portion (131) is formed on the plate surface of the above stage (130) to prevent the pouch-type secondary battery (10) placed thereon from sliding, and A sealing portion folding device for a pouch-type secondary battery, characterized in that each side of the above-mentioned stage (130) is equipped with a clamper (132) driven by a second driving unit (133) that clamps both sides in the longitudinal direction of a pouch-type secondary battery (10) seated on the stage (130).
In paragraph 1, The above folding unit (200) is, A movable member (210) installed to be movable in the X-axis and Z-axis directions, with a pair of support plates (211) spaced apart; A rotating body (220) that is rotatably disposed on each side of the above pair of support plates (211) and rotates by a rotational drive unit (221); A folding block (230) having one side and the other side respectively fixed eccentrically at the rotation center of the rotating body (220) and sequentially folding the sealing part (20) at a set angle while supporting the outer lower surface of the sealing part (20); and A sealing portion folding device for a pouch-type secondary battery, characterized by comprising: a third driving unit (240) connected to the above-mentioned folding block (230) via a rod and raising the folding block (230) to press the folded sealing portion (20).
In paragraph 4, A sealing part folding device for a pouch-type secondary battery, characterized in that the load of the third driving part (240) is further equipped with a load cell (250) for detecting pressure applied when pressurized.
In paragraph 1, The above folding guide unit (300) is, A diagonal guide (310) that is installed diagonally so as to be tiltable on a movable frame (330) that moves in the X-axis direction, and guides the sealing part (20) to be folded at an angle of 90 degrees or more by selectively contacting the primary folding point of the sealing part (20) while moving diagonally; and A sealing portion folding device for a pouch-type secondary battery, characterized by comprising: a vertical guide (320) which is installed to be movable in the Z-axis direction on the moving frame (330), and which guides the sealing portion (20) to be folded secondarily by selectively contacting the secondary folding point of the sealing portion (20) while moving in the Z-axis direction, and supports the pressure of the folding block (230) applied to the secondarily folded sealing portion (20).
In paragraph 6, To enable tilting of the above diagonal guide (310), The above diagonal guide (310) is movably installed on the diagonal axis moving robot (312), and The above diagonal axis moving robot (312) is coupled to a tilting plate (313) that rotates eccentrically on the moving frame (330), and A sealing portion folding device for a pouch-type secondary battery, characterized in that one side of the tilting plate (313) is rotatably coupled to the movable frame (330), and at least one arc-shaped slot (315) is formed at a position spaced apart from the center of rotation, through which a fixing bolt (316) passes and is coupled to the movable frame (330) to set the tilting angle.
In paragraph 6, The tip of the diagonal guide (310) is provided with a diagonal contact piece (311) that contacts the sealing part (20), and A sealing portion folding device for a pouch-type secondary battery, characterized in that the leading end of the vertical guide (320) is provided with a vertical contact piece (321) that contacts the sealing portion (20).
In paragraph 6, A sealing portion folding device for a pouch-type secondary battery, characterized in that the above-mentioned vertical guide (320) is positioned at an angle (θ) within the range of 5 to 10 degrees relative to the vertical line.
In paragraph 1, A sealing portion folding device for a pouch-type secondary battery, characterized in that the diagonal guide (310) and the vertical guide (320) have a length corresponding to or longer than the length of the sealing portion (20) of the pouch-type secondary battery (10).
In paragraph 1, The support block (120) has a protruding support portion (120a) formed thereon to support the lower surface of the sealing portion (20) of the pouch-type secondary battery (10), and A sealing portion folding device for a pouch-type secondary battery, characterized in that the above-mentioned folding block (230) has a protruding folding/pressing portion (230a) formed therein to fold the sealing portion (20) of the pouch-type secondary battery (10) and to press the folding portion.
In paragraph 1, A sealing portion folding device for a pouch-type secondary battery, characterized in that one or more of the support block (120) and the folding block (230) are provided with a heater (H) for heating.

Description

Sealing part folding device of pouch-type secondary battery The present invention relates to a folding device, and more specifically, to a sealing part of a pouch-type secondary battery that enables the folding of the sealing part of the pouch-type secondary battery up to 270 degrees through a single folding device. Generally, unlike primary batteries that cannot be recharged, secondary batteries capable of charging and discharging are being actively researched due to developments in advanced fields such as digital cameras, cellular phones, laptop computers, power tools, electric bicycles, electric vehicles, hybrid vehicles, and large-capacity power storage devices. Among secondary batteries, lithium secondary batteries are classified into cylindrical, prismatic, and pouch types based on their external shape; due to the recent trend toward the miniaturization of mobile devices, the demand for thin prismatic and pouch-type batteries is increasing. Among these, attention is focused on pouch-type secondary batteries, which have no restrictions on shape or size, are easy to assemble via thermal fusion, facilitate the release of gas or liquid in the event of abnormal behavior, and are particularly suitable for manufacturing lightweight, thin-walled cells. A pouch-type secondary battery is typically composed of a multilayer film of an aluminum foil layer and a synthetic resin layer covering it. To form a pouch-type lithium secondary battery, an electrode assembly in which a positive electrode, a separator, and a negative electrode are sequentially stacked is first placed inside a pouch in a sealed state, and when the protruding edge portion of the open pouch is heat-sealed, the fused portion is sealed, and a sealing portion having a predetermined length is formed. As shown above, the protruding sealing part has a structure that folds so that the overall volume of the pouch-type secondary battery can be reduced when stacked. To this end, prior registered patent No. 10-1974443 discloses a structure for an automatic terrace folding device for a secondary battery cell, and the device sequentially bends the terrace (sealing part) of the secondary battery cell to 90 degrees, 180 degrees, and 270 degrees while continuously moving the secondary battery cell. However, although the above device can bend the terrace of a secondary battery cell up to 270 degrees through an inline method, this requires the provision of multiple individual folding devices such as a first folding section, a second folding section, and a third folding section, which inevitably leads to a longer folding cycle time. Moreover, there are issues such as increased equipment costs due to the multiple folding devices and the need to secure a large space. FIG. 1 is a perspective view showing a folding device according to the present invention, and FIGS. 2 and FIGS. 3 are a bottom perspective view and a rear perspective view showing only the main structure of a folding device according to the present invention, and FIG. 4 is a cross-sectional view of the main part of FIG. 2, and Figure 5 is an enlarged view of 'Part A' of Figure 4, and FIGS. 6 to 10 are process diagrams showing the process of folding the sealing portion of a pouch-type secondary battery by the folding device of the present invention. Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be interpreted as being limited to the embodiments described below. These embodiments are provided to further explain the present invention in detail to those skilled in the art to which the invention pertains. Accordingly, the shape of each element shown in the drawings may be exaggerated to emphasize a clearer explanation. Terms such as "first," "second," etc., may be used to describe various components, but components should not be limited by these terms. Terms are used solely for the purpose of distinguishing one component from another. The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof. FIG. 1 is a perspective view showing a folding device according to the present invention, FIG. 2 and FIG. 3 are a bottom perspective view and a rear perspective view showing only the main structure of the folding device according to the present invention, FIG. 4 is