KR20200117177A - Manufacturing apparatus of pouch case for secondary battery and manufacturing mehtod the same - Google Patents

Abstract

Disclosed are an apparatus and a method for manufacturing a pouch case for a secondary battery. The apparatus for manufacturing a pouch case for a secondary battery according to an embodiment of the present invention is an apparatus for manufacturing a pouch case surrounding an electrode assembly of a secondary battery, and comprises: a support forming a seating end along an edge of an upper surface, forming a receiving portion stepped downward toward the inner side of the seating end, and forming a bridge portion protruding along a longitudinal direction at the center of the receiving portion so that the receiving portion is symmetrically divided; a stripper that forms a fixed end along an edge of a lower surface corresponding to the seating end, forms a space portion inside the fixed end, and is provided on an upper portion of the support to move vertically with respect to the support; and a punch forming a groove portion corresponding to the bridge portion to be installed to be movable in the vertical direction in the space portion and pressing a pouch case having an edge interposed between the seating end and the fixed end into the receiving portion.

Description

Manufacturing device and manufacturing method of pouch exterior material for secondary battery {MANUFACTURING APPARATUS OF POUCH CASE FOR SECONDARY BATTERY AND MANUFACTURING MEHTOD THE SAME}

The present invention relates to an apparatus and method for manufacturing a pouch case for a secondary battery, and more particularly, to reduce the overall cycle tickle time through process simplification, and to improve cooling efficiency by minimizing the sealing surface. It relates to an apparatus and a manufacturing method.

Secondary batteries are widely used as power sources for automobiles, mobile phones, notebook computers, and camcorders.

In particular, the use of lithium secondary batteries is rapidly increasing due to the advantages of high operating voltage and high energy density per unit weight.

These lithium secondary batteries mainly use lithium-based oxide as a positive electrode active material and a carbon material as a negative electrode active material, and are classified into lithium-ion batteries, lithium-ion polymer batteries, and lithium polymer batteries depending on the type of electrolyte commonly used. , Depending on the shape of the battery, it may be classified into cylindrical, square, and pouch-type secondary batteries.

Typically, in terms of the shape of the battery, there is high demand for a square secondary battery and a pouch-type secondary battery that can be applied to products such as mobile phones with a thin thickness.

Among them, there are no restrictions on shape and size, easy to assemble through heat fusion, and when an abnormal behavior occurs, the effect of discharging gas or liquid is easy, so interest in pouch-type secondary batteries particularly suitable for manufacturing light-weight and thin-walled cells. Is being concentrated.

The matters described in this background are prepared to enhance an understanding of the background of the invention, and may include matters not known in the prior art to those of ordinary skill in the field to which this technology belongs.

An embodiment of the present invention is to provide an apparatus and method for manufacturing an external material for a pouch for a secondary battery that improves cooling efficiency by reducing the overall cycle time and minimizing the sealing surface through process simplification.

In one or more embodiments of the present invention, as an apparatus for manufacturing a pouch case covering an electrode assembly of a secondary battery, a seating end is formed along an upper surface edge, and a receiving portion stepped downward is formed in the seating end, A die having a bridge portion protruding along the longitudinal direction at the center of the receiving portion so that the receiving portion is symmetrically divided, forming a fixed end along the lower surface corresponding to the seating end, and forming a space portion inside the fixed end And, a stripper provided on the top of the die and moving in a vertical direction with respect to the die, and a groove corresponding to the bridge part are formed to be installed so as to be movable in the vertical direction in the space part, and between the seating end and the fixed end It is possible to provide an apparatus for manufacturing a pouch case for a secondary battery including a punch for press-fitting a pouch case with an edge interposed therebetween.

In addition, the bridge portion partitions the receiving portion, and may be formed in a straight line along the longitudinal direction at the center of the die.

In addition, the height of the bridge portion of the die may be set to less than 1/2 of the thickness of the electrode assembly.

In addition, the height of the bridge portion of the die may be set to be smaller than the height of the seating end by 1 mm or more and 2 mm or less.

In addition, the bridge portion of the die may have an upper surface and a longitudinal edge connected to the bottom surface of the die to be rounded.

In addition, the seating end of the die may have an inner edge of the upper surface and each edge connected to the bottom surface of the die to be rounded.

In addition, the punch may be formed such that the groove portion and each corner of the lower surface in contact with the die are rounded.

And in one or more embodiments of the present invention, a manufacturing method for manufacturing a pouch case for a secondary battery using the apparatus for manufacturing a pouch case for a secondary battery according to one of claims 1 to 6, A first step of loading a pouch case cut to a certain size, a second step of fixing the pouch case between the mounting end of the die and the fixing end of the stripper by lowering the stripper disposed on the upper part of the die, the stripper A third step of forming a forming part symmetrical with respect to the bridge part of the die by pressing the pouch case material against the receiving part of the die by the lowering of the punch disposed inside of the die, and folding the pouch case material having the forming part formed thereon After loading into, it is possible to provide a method of manufacturing a pouch case for a secondary battery including a fourth step of forming a folding line by pressing.

In addition, the first step may be a step of loading a pouch exterior material to cover the seating end of the die.

In addition, the third step may be a step of forming a bridge line in the pouch case while the groove portion of the punch is inserted into the bridge portion of the die.

In addition, the fourth step may be a step of seating the pouch exterior material on the folding jig so that the bridge line corresponds to the folding part.

In addition, after the fourth step, a fifth step of symmetrically folding the forming portions symmetrical with respect to the folding line formed on the pouch exterior material so as to face each other may be further included.

In the apparatus and method for manufacturing a pouch case for a secondary battery according to an embodiment of the present invention, a bridge line is formed on the pouch case and a folding line is formed in response thereto, thereby removing the excess section due to the folding line during folding molding. Can reduce manufacturing cost.

In addition, the apparatus and method for manufacturing a pouch case for a secondary battery according to an exemplary embodiment of the present invention seals only three surfaces excluding the folding line, thereby reducing the sealing surface and improving cooling efficiency while improving sealing performance.

In addition, effects obtained or predicted by the embodiments of the present invention will be disclosed directly or implicitly in the detailed description of the embodiments of the present invention. That is, various effects predicted according to an embodiment of the present invention will be disclosed within a detailed description to be described later.

1 is a schematic configuration diagram of a secondary battery to which an exterior material for a pouch for a secondary battery is applied according to an embodiment of the present invention.
2 is a schematic perspective view of an apparatus for manufacturing a pouch case for a secondary battery according to an embodiment of the present invention.
3 to 7 are views sequentially showing a method of manufacturing a pouch case for a secondary battery according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, the present invention may be implemented in various forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same or similar components are described by applying the same reference numerals throughout the specification.

1 is a schematic configuration diagram of a secondary battery to which a pouch exterior material for a secondary battery is applied according to an embodiment of the present invention, and FIG. 2 is a schematic perspective view of an apparatus for manufacturing a pouch exterior material for a secondary battery according to an embodiment of the present invention. To 7 are views sequentially showing a method of manufacturing a pouch case for a secondary battery according to an embodiment of the present invention.

Referring to FIG. 1, a secondary battery 1 to which a pouch case 20 for a secondary battery according to an embodiment of the present invention is applied is composed of an electrode assembly 10 and a pouch case 20.

The electrode assembly 10 may be a stacked electrode assembly in which a plurality of positive and negative plates cut into a unit of a predetermined size are sequentially stacked with a separator interposed therebetween.

The positive electrode 11 and the negative electrode 13 of the electrode assembly 10 face each other and protrude from both sides of the pouch case 20.

The electrode assembly 10 is inserted and installed together with an electrolyte in the pouch case 20.

In addition, the pouch exterior material 20 is made of a composite material in which a polymer layer and a metal layer are sequentially stacked, and has a flexible property.

The pouch case 20 has an installation part 25 made of a closed space therein, and the electrode assembly 10 is inserted through the installation part 25.

In this case, the installation part 25 may be formed corresponding to the shape and size of the electrode assembly 10 to be inserted.

In addition, the pouch exterior material includes one side of the installation part 25, and three surfaces other than the one side are sealed to be sealed inside.

2, the apparatus for manufacturing a pouch case for a secondary battery according to an embodiment of the present invention for manufacturing the pouch case 20 as described above includes a die 30, a stripper 40, and a punch 50. It is composed by

First, the die 30 has a seating end 31 integrally protruding along the edge of the upper surface.

The seating end 31 may have a flat top surface.

The pouch exterior material 20 is seated at the seating end 31.

In addition, the die 30 has a receiving portion 33 stepped downward toward the inside of the seating end 31.

The receiving part 33 may be formed in the same square shape as the electrode assembly 10.

That is, the accommodating part 33 may be changed and applied according to the shape of the electrode assembly 10.

The seating end 31 may have an inner corner of the upper surface and each corner connected to the bottom surface of the die 30 to be rounded.

This is to prevent tearing while the pouch exterior material 20 is pressed in when the pouch exterior material 20 is formed.

At this time, a bridge portion 35 symmetrically partitioning the receiving portion 33 is formed to protrude upward in the center of the receiving portion 33.

The height h1 of the bridge part 35 may be greater than o, and may be set to less than 1/2 of the thickness of the electrode assembly.

In addition, the bridge portion 35 is formed to have a rounded upper surface and both edges in the longitudinal direction connected to the bottom surface of the die 30.

This is to prevent tearing while the pouch exterior material 20 is pressed in when the pouch exterior material 20 is formed.

The receiving portion 33 is partitioned so that both sides thereof are symmetrical with respect to the bridge portion 35.

Here, the bridge part 35 is formed to be lower than the height of the seating end 31.

For example, the height h1 of the bridge unit 35 may be set smaller than the height h2 of the seating end 31 by a height difference d of 1 mm or more and 3 mm or less.

This is to prevent the occurrence of a redundant section due to the folding line L2 during folding molding based on the folding line L2 after forming the folding line L2 to be described below.

In addition, this is to compensate for the insufficient height of the receiving portion 33 having a lower step than the seating end 31 when the pouch exterior material 20 is folded.

In addition, the stripper 40 is disposed on the die 30.

When the stripper 40 corresponds to the seating end 31, a fixing end 41 is formed along an edge thereof.

In this case, the fixed end 41 may be formed to have the same size as the seating end 31.

The stripper 40 includes a space 43 formed inside the fixed end 41.

The space portion 43 may be formed to have the same width as the receiving portion 33.

The stripper 40 is installed to be movable vertically with respect to the die 30 by the operation of a plurality of cylinders.

The stripper 40 has been described as an example that is operated by a cylinder, but is not necessarily limited thereto, and the type of the driving source may be changed and applied as necessary.

For example, the stripper 40 may be mounted to be movable in the vertical direction using a servo motor or the like.

In addition, the punch 50 is installed so as to be operable in the vertical direction in the space part 43.

In addition, a groove portion 55 is formed on the lower surface of the punch 50 to correspond to the bridge portion 35.

At this time, the groove part 55 is formed so that the bridge part 35 is inserted while the pouch case 20 is interposed therebetween.

In this case, the punch 50 may be formed such that the groove portion 55 and each corner of the lower surface contacting the die 30 are rounded.

This is to prevent tearing while the pouch case 20 is press-fitted during the foaming molding of the pouch case 20.

Such a punch 50 may be installed in the stripper 40 through a cylinder and mounted so as to be movable in the vertical direction, but is not necessarily limited thereto, and the driving source in which the punch 50 operates may be changed as needed. Can be applied.

A method of manufacturing the pouch exterior material 20 using the apparatus for manufacturing the pouch exterior material for secondary batteries as described above is as follows.

Referring to FIG. 3, a pouch case 20 cut into a predetermined size is loaded on the die 30.

Here, the pouch case 20 is seated to cover the entire upper surface of the die 30.

Next, the stripper 40 disposed on the upper part of the die 30 descends, and the pouch case 20 is placed between the mounting end 31 of the die 30 and the fixing end 41 of the stripper 40. It is fixed by interposing.

Referring to FIG. 4, the pouch case 20 is pressed into the receiving portion 33 of the die 30 by the lowering of the punch 50 disposed inside the stripper 40.

The groove portion 55 of the punch 50 corresponds to the bridge portion 35 of the die 30.

At this time, a bridge line L1 is formed in the pouch case 20 by the bridge part 35 of the die 30.

In addition, a forming part 21 symmetrical with respect to the bridge part 35 of the die 30 is formed on the pouch case 20, and the forming part 21 and the forming part 21 are formed outside the forming part 21. Stepped junction 23 is formed.

Referring to FIG. 5, the pouch exterior material 20 in which the forming part 21 is formed is loaded into the folding jig 60.

At this time, the pouch exterior material 20 is loaded so that the bridge line L1 formed by the bridge part 35 corresponds to the folding part 65 formed in the folding jig 60.

Referring to FIG. 6, the pouch exterior material 20 seated on the folding jig 60 is compressed to form a folding line L2 by the folding part 65.

For example, the pouch exterior material 20 may be compressed toward the folding jig 60 by air pressure using a vacuum ejector or the like from the top of the folding jig 60.

Here, the pouch exterior material 20 molded through the folding jig has the same depth as the folding line L2 side and the junction 23 side of the forming part 21.

That is, while the pouch exterior material 20 is molded by the folding jig 60, the folding line L2 is formed longer than the bridge line L1.

In other words, the height of the folding line L2 may be set to 1/2 of the thickness of the electrode assembly 10.

Next, referring to FIG. 7, the pouch exterior material 20 is symmetrically folded and molded so that the forming portions 21 face each other with respect to the folding line L2 formed on the pouch exterior material 20.

At this time, the bonding portions 23 formed along the outside of the forming portion 21 are in contact with the bonding portions 23 corresponding thereto.

These forming parts 21 are overlapped to form an installation part 25 of a closed space.

Finally, with the electrode assembly 10 inserted into the installation part 25 inside the pouch case 20, sealing along the three surfaces except for one side including the folding line L2 (S) (See Fig. 1).

At this time, after inserting the electrode assembly 10 into the pouch case 20, the electrolyte is introduced.

The sealing (S) may use heat, and the bonding portion 23 may be bonded while melting the polymer layer constituting the pouch case 20.

Accordingly, the apparatus and method for manufacturing a pouch case for a secondary battery according to an exemplary embodiment of the present invention are formed by forming a bridge line L1 on the pouch case 20 and then forming a folding line L2 corresponding thereto. When folding molding based on the line L2, the excess section due to the folding line L2 may be removed.

In addition, the apparatus and method for manufacturing a pouch case for a secondary battery according to an exemplary embodiment of the present invention may minimize the sealing surface of the pouch case 20 to improve sealing properties and increase cooling efficiency.

That is, the apparatus and method for manufacturing a pouch case for a dual battery can improve sealing performance by removing the sealing process on one side of the pouch case 20 instead of sealing the front surface of the conventional pouch case 20.

Accordingly, the manufacturing apparatus and manufacturing method of the pouch case for a secondary battery simplifies the manufacturing process, thereby reducing the overall cycle time and improving the productivity.

Although the above has been described with reference to a preferred embodiment of the present invention, those of ordinary skill in the relevant technical field can use the present invention in various ways within the scope not departing from the spirit and scope of the present invention described in the following claims. It will be appreciated that it can be modified and changed.

1: secondary battery 10: electrode assembly
11: positive 13: negative
20: pouch exterior material 21: forming part
23: connection part 25: installation part
30: die 31: seating end
33: receiving portion 35: bridge portion
40: stripper 41: fixed end
43: space part 50: punch
55: groove 60: folding jig
65: folding part L1: bridge line
L2: folding line

Claims (12)

As a device for manufacturing a pouch exterior material surrounding an electrode assembly of a secondary battery,
A die forming a seating end along an edge of the upper surface, forming a receiving portion stepped downward toward the inner side of the seating end, and forming a bridge portion protruding along a longitudinal direction at the center of the receiving portion so that the receiving portion is symmetrically divided;
A stripper that forms a fixed end along an edge of a lower surface corresponding to the seating end, forms a space portion inside the fixed end, and is provided on an upper portion of the die to move vertically with respect to the die; And
A punch configured to form a groove corresponding to the bridge portion to be installed to be movable in a vertical direction in the space portion and press-fit a pouch exterior material having an edge interposed between the seating end and the fixed end to the receiving portion;
An apparatus for manufacturing a pouch exterior material for a secondary battery comprising a. The method of claim 1,
The bridge part partitions the receiving part, and the apparatus for manufacturing a pouch case for a secondary battery formed in a straight line from the center of the die in a longitudinal direction. The method of claim 2,
The height of the bridge part of the die is set to less than 1/2 of the thickness of the electrode assembly. The method of claim 2,
The apparatus for manufacturing a pouch case for a secondary battery, characterized in that the height of the bridge portion of the die is set to be smaller than the height of the seating end by 1 mm or more and 2 mm or less. The method of claim 1,
An apparatus for manufacturing a pouch case for a secondary battery in which an upper surface of the die and both corners in a longitudinal direction connected to the bottom surface of the die are formed to be rounded. The method of claim 1,
An apparatus for manufacturing a pouch case for a secondary battery in which the seating end of the die has an inner edge of an upper surface and each edge connected to the bottom surface of the die to be rounded. The method of claim 6,
The punch is an apparatus for manufacturing a pouch case for a secondary battery in which a groove portion and each corner of a lower surface in contact with the die are rounded. A manufacturing method for manufacturing a pouch case for a secondary battery using the manufacturing apparatus according to any one of claims 1 to 7,
A first step of loading the pouch packaging material cut into a predetermined size on the die;
A second step of lowering the stripper disposed on the die and fixing the pouch case between the mounting end of the die and the fixing end of the stripper;
A third step of forming a forming part symmetrical with respect to the bridge part of the die by pressing the pouch case material into the receiving part of the die by lowering of the punch disposed inside the stripper; And
A fourth step of forming a folding line by loading the pouch exterior material having the forming part formed thereon into a folding jig and then compressing it;
Method of manufacturing a pouch exterior material for a secondary battery comprising a. The method of claim 8,
The first step
A method of manufacturing a pouch case for a secondary battery, which is a step of loading a pouch case to cover the mounting end of the die. The method of claim 8,
The third step
The step of forming a bridge line in the pouch exterior material while the groove part of the punch is inserted into the bridge part of the die is a method of manufacturing a pouch exterior material for a secondary battery. The method of claim 10,
The fourth step
A method of manufacturing a pouch exterior material for a secondary battery comprising the step of seating the pouch exterior material on the folding jig so that the bridge line corresponds to the folding unit. The method of claim 8,
After the fourth step,
A method of manufacturing a pouch case for a secondary battery, further comprising a fifth step of symmetrically folding the forming portions symmetrical with respect to the folding line formed on the pouch case to face each other.

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