WO2023068528A1

WO2023068528A1 - Separation film feeder for manufacturing cell stack

Info

Publication number: WO2023068528A1
Application number: PCT/KR2022/012794
Authority: WO
Inventors: 김태완
Original assignee: 주식회사 우원기술
Priority date: 2021-10-18
Filing date: 2022-08-26
Publication date: 2023-04-27
Also published as: KR102404678B1

Abstract

A separation film feeder for manufacturing a cell stack disclosed herein comprises: an unwinding shaft which grips a core on which a separation film is wound in the form of a roll and selectively unwinds the separation film; a dancer roll which maintains the tension of the separation film while guiding the separation film unwound from the unwinding shaft toward a stack table; a guide roll which guides the separation film guided from the dancer roll toward the stack table that rotates by a 45-degree angle to left and right sides so that the separation film can be folded in zigzag; and a separation film gripping and feeding means which is installed between the dancer roll and the guide roll, wherein the separation film gripping and feeding means grips the separation film during the manufacture of a cell stack, selectively feeds the separation film of the length corresponding to the folded length of the separation film that is folded in zigzag on the stack table, and releases the gripping of the separation film in order to discharge the cell stack that is manufactured when the manufacturing of the cell stack is finished.

Description

Membrane supply feeder for cell stack manufacturing

The present invention (Disclosure) relates to a separator supply feeder for cell stack manufacture, and more particularly, to a separator supply feeder for cell stack manufacture capable of maintaining constant tension of a separator folded in a zigzag shape by the operation of a stack table It is about.

Here, background art related to the present invention is provided, and they do not necessarily mean prior art (This section provides background information related to the present disclosure which is not necessarily prior art).

In general, a chemical battery is a battery composed of a pair of electrodes of a positive electrode and a negative electrode and an electrolyte, and the amount of energy that can be stored varies depending on the materials constituting the electrode and the electrolyte. These chemical batteries are divided into primary batteries that are used only for one-time discharge and secondary batteries that can be reused through repeated charging and discharging.

Secondary batteries are applied in various technical fields throughout the industry due to the above-described repetitive charging and discharging.

As anyone knows, a secondary battery is formed in a form in which a positive electrode plate, a separator, and a negative electrode plate are sequentially stacked and immersed in an electrolyte solution. Methods for manufacturing the internal cell stack of the secondary battery are largely classified into two types.

That is, in the case of a small-sized secondary battery, a method in which a negative electrode plate and a positive electrode plate are placed on a separator and rolled to form a jelly-roll is often used, and a medium-large-sized secondary battery having more electric capacity. In the case of , a method of stacking a negative electrode plate, a positive electrode plate, and a separator in an appropriate order is widely used.

In addition, there are several methods of manufacturing the internal cell stack of a secondary battery in a stacked manner. Among them, in the Z-stacking method, the separator is folded in a zigzag pattern, and the negative electrode plate and the positive electrode plate are alternately placed between the separators. are stacked in an inserted form.

A typical example of an apparatus for manufacturing a cell stack in the form of Z-stacking is 'Korean Patent Registration Publication No. 10-2120403 (Apparatus for manufacturing a cell stack for secondary batteries)' filed and registered for a patent by the present applicant. In 'Korean Patent Registration No. 10-2120403', the separator is folded in a zigzag shape by a stack table that rotates 45 degrees left and right, and a negative electrode plate and a positive electrode plate are alternately inserted between the separators folded in a zigzag shape. so that the cell stack is fabricated.

On the other hand, when manufacturing a cell stack, the separator is applied for a patent by the present applicant and registered as a patent through the 'secondary battery electrode film laminating device with improved separator meandering correction function' disclosed in 'Korean Patent Registration No. 10-2192738' fed into the stack table.

However, in 'Korean Patent Registration No. 10-2192738' described above, there is a problem in that the tension of the separator is not constant because the tension of the separator supplied to the stack table side is controlled only by a pendulum-moving dancer roll.

That is, during cell stack manufacturing, the separator supplied to the stack table rotates left and right along the stack table while being fixed to the stack table together with the negative electrode plate or the positive electrode plate by a mandrel. At this time, the separator is pulled in the direction of rotation of the stack table, Since the dancer roll moves in a direction opposite to the tension control direction by the separator being pulled, there is a limit to adjusting the tension of the separator using only the dancer roll.

In addition, since the separation membrane is supplied to the stack table side longer than the predetermined length due to the above problem, there is another problem in that the cell stack collapses during manufacture of the cell stack.

An object of the present invention (Disclosure) is to provide a separator supply feeder for manufacturing a cell stack capable of holding a separator and maintaining a constant tension of a separator folded in a zigzag shape on a stack table.

An object of the present invention is to provide a separator supply feeder for manufacturing a cell stack capable of supplying a separator toward the stack table with a length corresponding to the length of the separator folded in a zigzag shape on the stack table when the stack table rotates.

In addition, the problem to be solved by the present invention is not limited to the technical problems mentioned above, and other technical problems not mentioned are clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. It could be.

In order to solve the above problem, a separator supply feeder for cell stack manufacturing according to any one of the various aspects of the present invention grips a core on which a separator is wound in a roll form, and selectively removes the separator. an unwinding shaft for unwinding; a dancer roll for maintaining the tension of the separation film while guiding the separation film unwound from the unwinding shaft toward the stack table; a guide roll for guiding the separator guided by the dancer roll to the side of the stack table which rotates left and right by 45 degrees so as to be folded in a zigzag pattern; and means for gripping and supplying the separator installed between the dancer roll and the guide roll, wherein the means for gripping and supplying the separator grips the separator when manufacturing the cell stack, and selectively folds it in a zigzag shape on the stack table. The separation membrane may be supplied to a length corresponding to the folding length of the separation membrane, and gripping of the separation membrane may be released to discharge the manufactured cell stack upon completion of manufacturing the cell stack.

In the separator supply feeder for manufacturing a cell stack according to one aspect of the present invention, the separator gripping and supplying means includes a driving roll; and a first gripping roll and a second gripping roll installed on upper and lower sides of the driving roll, wherein the first gripping roll and the second gripping roll are in close contact with the driving roll during manufacture of the cell stack. The separator may be gripped together with the drive roll, and upon completion of manufacturing the cell stack, the first grip roll and the second grip roll may be spaced apart from the drive roll so that the separator is guided to a cell stack discharge position.

In the separator supply feeder for cell stack manufacturing according to one aspect of the present invention, the drive roll extends horizontally along the width direction of the separator, and both ends are rotatably supported by brackets, and the outer circumferential surface of the drive roll On the top, the separation membrane guided from the dancer roll via the first gripping roll is spanned, and the separation membrane spanning the driving roll is guided toward the guide roll via the second gripping roll, and one end of the driving roll is It is connected to a servomotor, and the servomotor rotates the driving roll to supply the separator to the stack table.

In the separator feeder for cell stack manufacturing according to one aspect of the present invention, the servomotor may supply the separator when the stack table completes left or right rotation and the separator is fixed to the stack table.

In the separator supply feeder for cell stack manufacturing according to one aspect of the present invention, the first grip roll and the second grip roll extend horizontally along the width direction of the separator, toward the lower side of the first grip roll. The separation membrane guided from the dancer roll side is spanned, the separation membrane spanned over the first gripping roll is guided to the upper side of the driving roll, and the upper side of the second gripping roll is guided from the lower side of the driving roll. The separation membrane may be spanned, and the separation membrane spanned over the second grip roll may be guided toward the guide roll.

In the separator supply feeder for cell stack manufacturing according to one aspect of the present invention, the cell stack separator supply feeder is installed between the second grip roll and the guide roll and rotates 45 degrees to the left and right by the stack table. The separator may further include a tension control roll that maintains tension of the separator being pulled while being guided obliquely, wherein the tension control roll elastically presses the separator to apply tension to the separator.

According to the present invention, it is possible to keep the tension of the separator folded in a zigzag shape constant on the stack table, thereby providing an effect of preventing the cell stack from collapsing as in the prior art during manufacture of the cell stack. be able to

1 is a view schematically showing a separator supply feeder for cell stack manufacturing according to the present invention.

FIG. 2 is an enlarged view of a means for gripping and supplying a separator shown in FIG. 1;

3 to 6 are diagrams schematically illustrating an operating state of the separator gripping and supply means shown in FIG. 1;

Hereinafter, an embodiment in which a separator supply feeder for cell stack manufacturing according to the present invention is implemented will be described in detail with reference to the drawings.

However, the essential (intrinsic) technical idea of the present invention cannot be said to be limited by the embodiments described below, and based on the essential (intrinsic) technical idea of the present invention, a person skilled in the art below It is revealed that the embodiments described in include the range that can be easily proposed as a method of substitution or change.

In addition, since the terms used below are selected for convenience of description, in grasping the essential (intrinsic) technical idea of the present invention, they are not limited to the dictionary meaning and are appropriately interpreted in a meaning consistent with the technical idea of the present invention. It should be.

Among the accompanying drawings, FIG. 1 is a diagram schematically illustrating a separator feeder for manufacturing a cell stack according to the present invention.

Referring to FIG. 1, the separator supply feeder 100 for cell stack manufacturing according to the present invention grips a core (C) on which a separator (S) is wound in a roll form, and selectively unwinds the separator (S). The shaft 110 and the dancer roll 120 for maintaining the tension of the separator S while guiding the separation film S unwound from the unwinding shaft 110 toward the stack table T, and guided by the dancer roll 120 It includes a guide roll 130 for guiding the separator (S) to the side of the stack table (T).

Here, the unwinding shaft 110, the dancer roll 120, and the guide roll 130 are each a cradle, dancer, and supply disclosed in 'Korean Patent Registration No. 10-2192738' mentioned in 'Technology Behind the Invention'. It is the same as the roller, and a detailed description thereof is omitted in the present invention.

In addition, the stack table T is a stack table constituting the 'apparatus for manufacturing a cell stack for secondary batteries' disclosed in 'Korean Patent Registration No. 10-2120403', and the separator S supplied by the operation of the stack table T is folded in a zigzag shape. And between the separators (S) folded in a zigzag shape, a negative plate (N; see FIGS. 4 to 6) and a positive plate (P; FIGS. 6) are stacked in an alternately inserted form to make one cell stack.

On the other hand, the cell stack separator supply feeder 100 according to the present invention is a separator gripping and supplying means 140 installed between the dancer roll 120 and the guide roll 130, unlike 'Korean Patent Registration No. 10-2192738'. ) is further included.

Among the accompanying drawings, FIGS. 2 to 6 are diagrams schematically illustrating a means for gripping and supplying a separator.

Referring to FIGS. 1 to 6 , the separation membrane gripping and supply unit 140 includes a driving roll 142 and first and

second gripping rolls

148a and 148b provided as a pair.

First, the drive roll 142 grips the separator S supplied to the stack table T side together with the first and

second grip rolls

148a and 148b. In addition, the drive roll 142 supplies the gripped separator S to the stack table T side along with the first and

second grip rolls

148a and 148b.

As shown, the drive roll 142 extends horizontally along the width direction of the separator S, and both ends of the drive roll 142 are rotatably supported by brackets (not shown).

On the outer circumferential surface of the drive roll 142, a separator (S) guided from the dancer roll 120 via the first gripping roll 148a is spanned, and the separator (S) spanned by the drive roll 142 is the second It is guided to the side of the guide roll 130 via the grip roll 148b.

Meanwhile, a servomotor 146 is connected to one end of the drive roll 142 via a normal coupling.

In this way, the drive roll 142 connected to the servo motor 146 receives rotational driving force from the servo motor 146 and rotates. At this time, the drive roll 142 is gripped together with the first and

second grip rolls

148a and 148b. One separator (S) is supplied to the side of the stack table (T) through the guide roll 130 in a predetermined length.

Here, the servomotor 146 guides the separator S fixed to the stack table T at an angle of 45 degrees to the left and right by the stack table T, and then moves the negative plate N or the positive plate P by the mandrel. When fixed to the stack table (T) together, the drive roll 142 is rotated at the same time to supply the separator (S) to the stack table (T) side with a predetermined length.

In other words, the servomotor 146 rotates the driving roll 142 in advance to move the separator S to the stack table T before the stack table T rotates in the opposite direction after completing the left or right rotation of the stack table T. supply to the side.

Preferably, the preset length of the separator S is the same as the length of the separator S folded on the stack table T, and the preset length may vary depending on the size of the cell stack to be manufactured (see FIG. 6). there is.

The first and second

gripping rolls

148a and 148b together with the drive roll 142 grip the separator S supplied toward the stack table T. In addition, the first and second grip rolls 148a and 148b guide the separator S when the separator S is supplied by the operation of the driving roll 142 .

Like the drive roll 142, the first and second grip rolls 148a and 148b extend horizontally along the width direction of the separator S, and the first and second grip rolls 148a and 148b are as shown. As such, they are freely rotatably installed on the upper and lower sides of the drive roll 142, respectively.

The separation film S guided from the dancer roll 120 side spans the lower side of the first gripping roll 148a installed in this way, and the separator S spanning the first gripping roll 148a extends over the drive roll 142. Guided to the upper side. In addition, the upper side of the second gripping roll 148b is crossed with the separator (S) guided from the lower side of the drive roll 142, and the separator (S) spanned on the second gripping roll 148b is the guide roll 130 guided to the side.

Meanwhile, the first and second grip rolls 148a and 148b come into close contact with the driving roll 142 during cell stack manufacturing and grip the separator S together with the driving roll 142 (see FIGS. 3 to 5), When the cell stack manufacturing is completed, the separator S is guided to the cell stack discharge position by a cell stack discharge means (not shown) and installed away from the drive roll 142 to be cut (see FIG. 6 ).

Since the first and second grip rolls 148a and 148b press and hold the separator S toward the drive roll 142 during cell stack manufacturing, the drive roll 142 can supply the separator S to a predetermined length. In addition, it is possible to maintain constant tension of the separator (S) folded in a zigzag shape by the stack table (T).

When the separator S is cut at the cell stack discharge position by the stack discharge means, the first and second grip rolls 148a and 148b come into close contact with the drive roll 142 to grip the separator S.

Here, the first and second

gripping rolls

148a and 148b are connected to a general pneumatic cylinder (not shown) and may be in close contact with the driving roll 142 or spaced apart from the driving roll 142, and may be connected to the pneumatic cylinder and Since the connection relationship between the first and second grip rolls 148a and 148b is a well-known technique, a detailed description thereof will be omitted.

That is, when the front end side of the separator (S) is adsorbed to the stack table (T), the servomotor 146 rotates the drive roll 142 to supply the separator (S) to the stack table (T) side at a predetermined length, , When the supply of the separation membrane S to a predetermined length is completed, the servomotor 146 stops the rotation of the driving roll 142 (see FIG. 3), whereby the separation membrane S moves to the first and second grip rolls. The state held between (148a, 148b) and drive roll 142 is maintained.

And, as described above, the separator (S) is supplied to the side of the stack table (T) with a predetermined length, and at the same time, the stack table (T) rotates 45 degrees to the left, whereby the separator (S) moves along the stack table (T). It is guided at an angle of 45 degrees to the left, and at the same time the separator S is supplied (see FIG. 4).

At this time, since the first and second grip rolls 148a and 148b maintain a gripped state of the separator S along with the drive roll 142, the separator S maintains a constant tension and the stack table T It is guided at an angle of 45 degrees to the left.

The negative electrode plate N is loaded on the separator S led to the left in this way by a negative electrode transfer picker (not shown), and the negative electrode plate N is fixed to the stack table T together with the separator S by a mandrel. .

On the other hand, as described above, when the negative electrode plate N is loaded on the separator S guided at an angle of 45 degrees to the left and fixed by the mandrel, the servomotor 146 rotates the drive roll 142 again to separate the separator ( S) is supplied to the stack table (T) with a preset length, and when the supply of the separator (S) is completed with a preset length, the servomotor 146 stops the rotation of the drive roll 142 (see FIG. 4). As a result, the separation membrane S is maintained between the first and second

gripping rolls

148a and 148b and the driving roll 142 .

And, as described above, when the separator (S) is supplied to a predetermined length, the stack table (T) is rotated 45 degrees to the right, whereby the separator (S) covers the negative electrode plate (N) while stacking the table (T). It is guided at an angle of 45 degrees to the right (see FIG. 5).

At this time, similarly, since the first and second

gripping rolls

148a and 148b maintain a gripped state of the separator S along with the drive roll 142, the separator S maintains a constant tension while holding the negative electrode plate N. covered and folded.

A positive electrode plate (P) is loaded on the separator (S) guided to the right in this way by a positive electrode transfer picker (not shown), and the positive electrode plate (P) is placed on a stack table (T) together with the separator (S) by another mandrel. At the same time, the mandrel fixing the negative electrode plate N to the stack table T is retracted, and the servomotor 146 rotates the drive roll 142 again to move the separator S to a predetermined length on the stack table ( T), and when the supply of the separation membrane S is completed to a predetermined length, the servomotor 146 stops the rotation of the driving roll 142 (see FIG. 5).

By this method, since the separator S is folded in a zigzag shape while maintaining a constant tension, it is possible to prevent the cell stack from collapsing as in the prior art when the stack is manufactured.

On the other hand, the cell stack separator supply feeder 100 according to the present invention is guided at an angle of 45 degrees to the left and right by the stack table T, and the tension control roll 164 prevents wrinkles in the separator S being pulled. more includes

Like the drive roll 142, the tension control roll 164 extends horizontally along the width direction of the separator S, and can freely rotate between the second gripping roll 148b and the guide roll 130 as shown. be installed At this time, the tension control roll 164 elastically presses the separator S in a direction perpendicular to the tension direction of the separator S guided toward the guide roll 130 via the second gripping roll 148b. The tension of the sea separation membrane S is kept constant.

That is, when the separator (S) is pulled during cell stack manufacturing, the tension control roll 164 moves in a direction opposite to the direction in which the separator (S) is pressed while maintaining a constant tension of the separator (S), and the separator ( When S) is loosened, the tension control roll 164 maintains the tension of the separation membrane S at a constant level while moving in the pressing direction of the separation membrane S.

Here, the tension control roll 164 can be connected to a general pneumatic cylinder (not shown) to elastically pressurize the separator (S), and since the connection relationship between the pneumatic cylinder and the tension roll 164 is a known technology, Detailed descriptions are omitted.

The separator supply feeder 100 for cell stack manufacturing according to the present invention formed as described above makes it possible to maintain a constant tension of the separator S folded in a zigzag shape on the stack table T, thereby maintaining the cell stack during cell stack manufacturing. This makes it possible to prevent collapse as in the prior art.

Claims

an unwinding shaft holding the core on which the separator is wound in the form of a roll and selectively unwinding the separator;

a dancer roll for maintaining the tension of the separation film while guiding the separation film unwound from the unwinding shaft toward the stack table;

a guide roll for guiding the separator guided by the dancer roll to the side of the stack table, which turns and rotates alternately in left and right directions so as to be folded in a zigzag form; and

Including; separator gripping and supplying means installed between the dancer roll and the guide roll,

The separation membrane gripping and supply means,

drive roll; and

Including; a first gripping roll and a second gripping roll installed on the upper and lower sides of the driving roll,

During the manufacture of the cell stack, the first gripping roll and the second gripping roll are in close contact with the driving roll to grip the separation membrane together with the driving roll and selectively together with the driving roll rotated by a servo motor to selectively stack the stack. Supplying the separator with a length corresponding to the folding length of the separator folded in a zigzag pattern on the table;

Upon completion of manufacturing the cell stack, the first grip roll and the second grip roll are spaced apart from the drive roll so that the separator is guided to a cell stack discharge position;

The servomotor is connected to one end of the drive roll, and supplies the separator when the separator is fixed to the stack table after the stack table completes left or right rotation.
The method of claim 1,

The drive roll,

It extends horizontally along the width direction of the separator, and both ends are rotatably supported by brackets,

On the outer circumferential surface of the driving roll, the separation membrane guided from the dancer roll via the first gripping roll is spanned, and the separation membrane spanning the driving roll is guided toward the guide roll via the second gripping roll. Separator feeder for manufacturing.
The method of claim 2,

The first grip roll and the second grip roll extend horizontally along the width direction of the separator,

The separation membrane guided from the dancer roll side spans the lower side of the first gripping roll, the separation membrane spanning the first gripping roll guides the upper side of the drive roll, and the upper side of the second gripping roll A separator supply feeder for cell stack manufacturing, wherein the separation membrane guided from the lower side of the drive roll is overlaid, and the separation membrane over the second grip roll is guided toward the guide roll.
The method of claim 1,

The cell stack separator supply feeder,

A tension control roll installed between the second gripping roll and the guide roll to maintain the tension of the separator being pulled while being guided at an angle of 45 degrees to the left and right by the stack table; further comprising,

The tension control roll is a separator supply feeder for manufacturing a cell stack that elastically presses the separator to impart tension to the separator.
The method of claim 1,

The stack table is a separator supply feeder for cell stack manufacturing that rotates and rotates left and right by 45 degrees.