KR20230160156A - Device for manufacturing cell stack of secondary battery - Google Patents

Abstract

A secondary battery cell stack manufacturing apparatus is disclosed. The secondary battery cell stack manufacturing device is characterized by controlling the tension of the separator by adjusting the rotation speed of the feeder roll. In addition, the secondary battery cell stack manufacturing apparatus is characterized by controlling the tension of the separator by adjusting the rotation speed of the feeder roll according to the movement speed and/or movement position (trajectory) of the guide roller. In addition, the secondary battery cell stack manufacturing apparatus is characterized in that the tension of the separator is controlled by the moving speed and moving trajectory of the guide roller.
The secondary battery cell stack manufacturing device includes a separator supply unit, a tension control unit, and a stack stacking unit. The tension adjusting unit includes a feeder roll rotated by the feeder roll driving unit to adjust the tension of the separator.

Description

Device for manufacturing cell stack of secondary battery}

The present invention relates to a cell stack manufacturing device for secondary batteries, and more specifically, to a secondary battery cell stack manufacturing device capable of maintaining and controlling the tension of the separator.

A secondary battery is a device that converts electrical energy into chemical energy, stores it, and generates electricity when needed. Both charging and discharging occur at one electrode, and it consists of an oxidizing electrode (anode, - electrode) and a cathode (+ electrode). are distinguished based on discharge response.

A secondary battery includes a positive and negative electrode plate coated with an active material on a current collector, a separator that separates the positive and negative electrode plates, an electrolyte that transfers ions through the separator, and a case that accommodates the positive plate, separator, and negative electrode plate. It includes lead tabs that are connected to the positive and negative plates and drawn out.

These secondary batteries are made up of a positive electrode plate, a separator, and a negative electrode plate sequentially stacked and immersed in an electrolyte solution. There are two major ways to manufacture the cell stack of such secondary batteries.

In the case of small secondary batteries, the method of placing the negative and positive plates on a separator and winding them to manufacture them in a jelly-roll form is often used. In the case of medium to large secondary batteries with more electric capacity, the negative electrode plate is used. , a method of manufacturing the positive plate and separator by stacking them in an appropriate order is widely used.

There are several ways to manufacture secondary battery cell stacks by layering. Among them, in the Z-stacking method, the separator is folded in a zigzag manner, and the negative and positive plates are stacked alternately between them.

The cell stack of secondary batteries in this Z-stacking form is disclosed in various prior arts such as Patent Publication No. 10-2021-0031152.

The above-mentioned Patent Publication No. 10-2021-0031152 discloses a secondary battery cell stack manufacturing system that allows manufacturing a cell stack by supplying a separator onto a stack table that moves back and forth from side to side.

However, the secondary battery cell stack manufacturing system of Patent Publication No. 10-2021-0031152 has difficulty improving the production speed of the cell stack due to the weight of the stack table that moves back and forth left and right, and the separator unwinder and stack table are difficult to improve. There is no component in between that can adjust (control) the tension of the separator, making it difficult to control the tension of the separator.

Republic of Korea Patent Publication No. 10-2021-0031152 (publication date: March 19, 2021)

The purpose of the present invention is to provide a secondary battery cell stack manufacturing device that can adjust the tension of the separator and improve the production speed of the cell stack by adjusting the tension of the separator.

The object of the present invention described above is achieved by controlling the rotation speed of the feeder roll rotated by a separate driving unit. In addition, it is characterized by being achieved by the moving speed and moving trajectory of the guide roller. In addition, this is achieved by adjusting the rotational speed of the feeder roll according to the moving speed and/or moving position (trajectory) of the guide roller.

The object of the present invention described above is achieved through specific details described later.

The secondary battery cell stack manufacturing device of the present invention includes a separator supply unit, a tension adjustment unit, and a stack stacking unit. The separator supply unit supplies a separator. The tension control unit adjusts the tension of the separator moved from the separator supply unit. The stack lamination unit is disposed below the tension adjustment unit. In addition, the tension adjusting unit includes a feeder roll rotated by the feeder roll driving unit to adjust the tension of the separator.

Specifically, the separator supply unit includes a separator unwinder, a plurality of separator traveling rollers, and a dancer unit. The separator unwinder winds the separator. The plurality of separator traveling rollers guide the separator unwound from the separator unwinder to the tension control unit. The dancer part is disposed between the separator unwinder and the tension adjuster.

Specifically, the dancer unit includes a plurality of dancer rolls, a first support member, and a second support member. The plurality of dancer rolls rotate by movement of the separator. The first support member supports some of the dancer rolls among the plurality of dancer rolls. The second support member supports another part of the dancer roll among the plurality of dancer rolls, and is arranged to be spaced apart from the first support member by a preset distance.

Specifically, the first support member moves or rotates with one side of the first support member as a central axis.

Specifically, the second support member moves or rotates with one side of the second support member as a central axis.

Specifically, the first support member and the second support member can rotate while moving.

Specifically, the tension adjusting unit includes a feeder roll, a feeder roll driving unit, and a guide roller. The feeder rolls are provided in pairs. The feeder roll driving unit rotates a pair of feeder rolls. The guide roller is disposed between a pair of feeder rolls and a stack lamination unit. The separator passes between a pair of feeder rolls and moves to the guide roller.

Specifically, the guide rollers are provided as a pair, and guide the separator that passes between the pair of feeder rolls to cover the electrode plates sequentially stacked on the stack stack.

Specifically, the pair of guide rollers reciprocate from the left-most position to the right-outmost position, and from the right-most position to the left-most position.

Specifically, the pair of guide rollers reciprocate the distance from the leftmost position divided into A section, B section, and C section to the right outermost position.

Specifically, the pair of guide rollers moves from the outermost position on the left to the outermost position on the right, moving upward along an arc-shaped trajectory in the section A, and moving horizontally in the section B, In section C, it moves in a downward direction along an arc-shaped trajectory. At this time, the pair of guide rollers performs a constant acceleration movement in the section A, a constant speed movement in the section B, and a uniform deceleration movement in the section C.

Specifically, the pair of guide rollers moves from the outermost position on the right to the outermost position on the left, moves upward along an arc-shaped trajectory in the section C, and moves horizontally in the section B, In section A, it moves in a downward direction along an arc-shaped trajectory. At this time, the pair of guide rollers performs a constant acceleration movement in the section C, a constant speed movement in the section B, and a uniform deceleration movement in the section A.

Specifically, the stack stacking unit includes a cell stack and a stack table. The cell stack has a structure in which a plurality of electrode plates are stacked with a separator in between. In the stack table, cell stacks are arranged. And, the stack table moves downward when one electrode plate is covered with a separator.

According to an example of another embodiment of the present invention, the stack table moves downward and upward while one electrode plate is covered with a separator.

The secondary battery cell stack manufacturing device according to the present invention has the effect of controlling the tension of the separator moving from the separator unwinder through the tension control unit.

In addition, the secondary battery cell stack manufacturing apparatus of the present invention has the effect of controlling the tension of the separator moving from the separator unwinder to the feeder roll by controlling the rotation speed of the feeder roll.

In addition, the secondary battery cell stack manufacturing device of the present invention has the effect of maintaining the tension of the separator by the moving speed and/or moving trajectory of the guide roller after the tension cut.

In addition, the secondary battery cell stack manufacturing device of the present invention has the effect of controlling the tension of the separator by controlling the rotational speed of the feeder roll according to the moving speed and/or moving position (trajectory) of the guide roller after tension cut. .

In addition, the cell stack manufacturing apparatus for secondary batteries according to examples of embodiments of the present invention has the effect of improving the efficiency of cell stack production and improving product reliability by reducing defects caused by wrinkles in the separator. .

Figure 1 shows a cell stack manufacturing apparatus for secondary transposition according to an example of an embodiment of the present invention.
Figure 2 shows the dancer unit of Figure 1.
Figure 3a shows the support member of Figure 2 moving.
Figure 3b shows the support member of Figure 2 rotating.
FIG. 4 shows the tension adjusting unit and stack lamination unit of FIG. 1.
Figure 5 shows an example of another embodiment of the stack stack.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the attached drawings. Among the components of the present invention, detailed descriptions of those that can be clearly understood and easily reproduced by a person skilled in the art according to the prior art will be omitted in order to not obscure the gist of the present invention.

The secondary battery cell stack manufacturing device described in this specification is a device for manufacturing secondary battery cell stacks using the Z-stacking method. The Z-stacking method is a cell stack manufacturing method in which a long sheet-shaped separator is folded in a zigzag manner and one positive plate and one negative plate are alternately stacked between the folded separators.

Hereinafter, a cell stack manufacturing apparatus for secondary transposition according to an example of an embodiment of the present invention will be described.

Figure 1 shows a cell stack manufacturing apparatus for secondary transposition according to an example of an embodiment of the present invention.

Referring to Figure 1, the secondary battery cell stack manufacturing apparatus according to an example of an embodiment of the present invention includes a separator supply unit 10, a tension adjustment unit 20, and a stack lamination unit.

The separator supply unit 10 supplies the separator 11 to the stack lamination unit 30.

The separator supply unit 10 includes a separator unwinder 12, a separator traveling roller 13, and a dancer unit 14.

The separator unwinder 12 winds a long separator 11.

The separator unwinder 12 may be located on the upper, left, or right side of the tension adjustment unit 20 and/or the stack lamination unit 30 depending on the number of membrane traveling rollers 13.

The separator unwinder 12 is rotated by a known driving device. The driving device may include, for example, a driving motor, a reducer, a pulley, a belt, etc., and may include various connection members to be connected to the driving device.

The moving speed of the separator unwinded from the separator unwinder 12 is the same up to the feeder roll 21, which will be described later. Accordingly, the separator 11 from the separator unwinder 12 to the feeder roll 21 receives the same tension. In other words, the tension of the separator 11 from the separator unwinder 12 to the feeder roll 21 is maintained constant.

To ensure that the moving speed of the separator 11 moving from the separator unwinder 12 to the feeder roll 21 remains the same, the driving device that rotates the separator unwinder 12 is the separator unwinder 12. ) at a preset speed, and the feeder roll driving unit that rotates the feeder roll 21 rotates the feeder roll 21 at a preset speed.

Meanwhile, an apparatus for manufacturing a secondary battery cell stack according to an exemplary embodiment of the present invention includes a control unit (not shown).

The control unit controls the driving device of the separator unwinder 12 and the feeder roll driving device. In response to a control signal from the controller, the driving device of the separator unwinder 12 rotates the separator unwinder 12 at a preset speed. Additionally, in response to a control signal from the controller, the feeder roll driver rotates the feeder roll 21 at a preset speed.

The separator traveling roller 13 guides the separator 11 unwound from the separator unwinder 12 to the tension adjuster 20. Additionally, the separator traveling roller 13 can prevent the separator 11 from sagging.

The separator traveling roller 13 is formed in a bar shape with a circular cross-section and a preset length in one direction. Here, the preset length is formed to be larger than the width of the separator 11.

A plurality of separator traveling rollers 13 may be disposed from the separator unwinder 12 to the tension adjuster 20.

As shown in FIG. 1, one or more separator traveling rollers 13 may be disposed between the separator unwinder 12 and the dancer unit 14, and the dancer unit 14 and the tension adjusting unit 20 One or more may be placed in between.

The separator traveling rollers 13 may be arranged in a preset number on the moving path of the separator 11 so that the separator 11 can be guided from the separator unwinder 12 to the tension adjuster 20.

The separation membrane traveling roller 13 is installed (arranged) to be rotatable.

Specifically, the separator traveling roller 13 is in a rotatable state (idle state) and is not directly or indirectly connected to a specific driving unit (for example, a motor, etc.). When the separator 11, unwound from the separator unwinder 12 by rotation of the separator unwinder 12 and/or the feeder roll 21, which will be described later, moves in contact with the separator traveling roller 13, the separator The traveling roller 13 rotates due to frictional force with the separator 11.

The dancer unit 14 is disposed between the separator unwinder 12 and the tension adjuster 20.

The dancer unit 14 can control the tension of the separator 11 and the unwinding speed of the separator unwinder 12.

In order for the dancer unit 14 to adjust the tension of the separator 11 and the unwinding speed of the separator unwinder 12, the dancer unit 14 may move or rotate in the left or right direction.

Figure 2 shows the dancer unit 14 of Figure 1, Figure 3a shows the support members 142 and 143 of Figure 2 moving, and Figure 3b shows the support members 142 and 143 of Figure 2 rotating. indicates that

1 to 3A and 3B, the dancer unit 14 includes a dancer roll 141 that rotates by the movement of the separator 11 and a support member 142 that supports the dancer roll 141. , 143).

The dancer roll 141 is formed in a bar shape with a circular cross-section and a preset length in one direction. Here, the preset length is formed to be larger than the width of the separator 11.

The dancer roll 141 is supported by support members 142 and 143.

The dancer roll 141 is rotatably mounted.

Specifically, the dancer roll 141 is in a rotatable state (idle state) and is not directly or indirectly connected to a driving unit such as a motor. When the separator 11 moves in contact with the dancer roll 141, the dancer roll 141 may rotate due to frictional force with the separator 11.

The support members 142 and 143 include a first support member 142 and a second support member 143 disposed on one side and the other, respectively.

The first support member 142 and the second support member 143 are arranged to be spaced apart by a preset distance.

The first support member 142 supports some of the dancer rolls 141 among the plurality of dancer rolls 141. That is, a plurality of dancer rolls 141 are rotatably disposed on the first support member 142.

The first support member 142 may be provided as a pair to rotatably mount a plurality of dancer rolls 141. In other words, the dancer roll 141 is formed in the shape of a bar (circular cross-section) having a preset length in one direction, and both ends of the dancer roll 141 are supported by a pair of first support members 142. It is rotatably supported. Here, both ends of the dancer roll 141 represent one end and the other end of the dancer roll 141.

Specifically, one of the pair of first support members 142 supports one end of the dancer roll 141, and the other of the pair of first support members 142 supports the other end of the dancer roll 141. support.

Additionally, the second support member 143 supports some of the other dancer rolls 141 among the plurality of dancer rolls 141. That is, a plurality of dancer rolls 141 are rotatably disposed on the second support member 143.

The second support member 143 may be provided as a pair so that the plurality of dancer rolls 141 can be rotatably mounted. In other words, the dancer roll 141 is formed in the shape of a bar (circular cross-section) having a preset length in one direction, and both ends of the dancer roll 141 are supported by a pair of second support members 143. It is rotatably supported. Here, both ends of the dancer roll 141 represent one end and the other end of the dancer roll 141.

Specifically, one of the pair of second support members 143 supports one end of the dancer roll 141, and the other of the pair of second support members 143 supports the other end of the dancer roll 141. support.

The support members 142 and 143 can move or rotate. 3A and 3B, the second support member 143 is shown, and the first support member 142 can also move or rotate in the same manner.

Specifically, the first support member 142 and/or the second support member 143 moves in the x-axis direction or in a direction opposite to the x-axis direction (see FIG. 3A), or moves in the y-axis direction or in a direction opposite to the y-axis direction. You can move to . Here, the x-axis and y-axis represent axes that are orthogonal to each other.

Alternatively, the first support member 142 and/or the second support member 143 may rotate in the x-axis direction or in a direction opposite to the x-axis direction based on the y-axis direction (see FIG. 3B). When the support members 142 and 143 rotate, one end of the support members 142 and 143 may become the central axis of rotation.

Additionally, the first support member 142 and/or the second support member 143 may rotate while moving. Specifically, the first support member 142 and/or the second support member 143 may rotate about the y-axis direction while moving in the x-axis direction or the y-axis direction.

The first support member 142 and the second support member 143 can move together. Alternatively, the first support member 142 may move and the second support member 143 may not move. Alternatively, the first support member 142 may not move and the second support member 143 may move. Here, moving refers to moving and/or rotating.

The support members 142 and 143 may be equipped with a known movement driving device and a known rotation driving device for the above-described movement and rotation. Here, known moving driving devices and rotation driving devices may include, for example, a drive motor, a reducer, a pulley, a belt, etc., and may include various connecting members to be connected to the driving device.

The separator 11 is alternately wound around a plurality of dancer rolls 141 disposed on the first support member 142 and the second support member 143, respectively. Specifically, the separator 11 is wound around the first dancer roll 141 mounted on the first support member 142 (or the second support member 143) and then connected to the second support member 143 (or the first support member 143). It is wound around the first dancer roll 141 mounted on the member 142). Then, after being wound around the second dancer roll 141 mounted on the first support member 142 (or the second support member 143), it is wound on the second support member 143 (or the first support member 142). It is wound around the installed second dancer roll (141). That is, the separator 11 sequentially passes through the plurality of dancer rolls 141 disposed on the first support member 142 and the second support member 143 and moves to the tension adjusting unit 20.

By moving and/or rotating the above-described support members 142 and 143, the tension of the separator 11 can be adjusted and the unwinding speed of the separator 11 in the separator unwinder 12 can be adjusted.

The separator 11 supplied (moved) from the separator supply unit 10 moves to the tension adjusting unit 20. According to an example of the embodiment of the present invention, the separation membrane 11 passes through the separation membrane traveling roller 13 disposed (mounted) between the dancer unit 14 and the tension adjustment unit 20 and then passes through the tension adjustment unit 20. ) Go to

FIG. 4 shows the tension adjustment unit 20 and the stack lamination unit 30 of FIG. 1 .

Referring to FIG. 4, the tension adjusting unit 20 includes a feeder roll 21, a feeder roll driving unit, and a guide roller 22.

The tension adjusting unit 20 adjusts the tension of the separator 11.

The tension adjusting unit 20 is disposed on one side of the separator supply unit 10 and is disposed on the stack lamination unit 30, which will be described later. Here, one side of the separator supply unit 10 represents below or next to the separator supply unit 10.

The feeder roll 21 maintains the tension of the separator 11 supplied (moved) from the separator supply unit 10 constant.

The feeder rolls 21 are provided in pairs. The separation membrane 11 passes between the pair of feeder rolls 21 and moves to the guide roller 22.

One of the pair of feeder rolls (21) brings the separator 11 into close contact with the other feeder roll (21). Accordingly, the separator 11 is in close contact with each of the pair of feeder rolls 21. This means that a pair of feeder rolls 21 are in close contact with each other with the separator 11 in between.

A pair of feeder rolls 21 are rotated by the feeder roll driving unit.

Specifically, one of the pair of feeder rolls 21 is rotated by the feeder roll driving unit. There is a separator 11 between a pair of feeder rolls 21, one of the pair of feeder rolls 21 is rotated by the feeder roll driver, and the other feeder roll 21 is a moving separator ( 11) It rotates due to frictional force. Therefore, when one of the pair of feeder rolls 21 rotates clockwise (or counterclockwise), the other one of the pair of feeder rolls 21 rotates counterclockwise (or clockwise). .

The moving speed of the separator 11 moving between the pair of feeder rolls 21 is the same as the moving speed of the separator 11 moving between the separator unwinder 12 and the feeder roll 21. Accordingly, the separator 11 passing between the pair of feeder rolls 21 from the separator unwinder 12 receives the same tension. In other words, the tension of the separator 11 from the separator unwinder 12 to the feeder roll 21 is maintained constant.

As described above, so that the moving speed of the separator 11 moving from the separator unwinder 12 to the feeder roll 21 can be maintained the same (i.e., from the separator unwinder 12 to the feeder roll 21 ), the feeder roll driving unit that rotates the feeder roll 21 rotates the feeder roll 21 at a preset speed so that the tension of the separator 11 can be maintained constant. Additionally, the driving device that rotates the membrane unwinder 12 rotates the membrane unwinder 12 at a preset speed.

Meanwhile, the tension of the separator 11 passing between the pair of feeder rolls 21 becomes lower than the tension of the separator 11 passing between the pair of feeder rolls 21. Accordingly, the pair of rotating feeder rolls 21 performs a tension cut function while maintaining the tension of the separator 11 constant. Here, the tension cut means that the tension of the separator 11 is maintained differently before and after passing through the feeder roll 21.

The feeder roll driving unit drives (rotates) the feeder roll (21). Specifically, the feeder roll driving unit rotates a pair of feeder rolls (21).

As shown in Figure 4, the feeder roll driving unit includes a drive motor 211, a pulley 214 connected to the rotation axis of the drive motor 211 (this is called a 'motor pulley'), and a pair of feeder rolls 21. ) a pulley 213 (this is referred to as a 'feeder roll pulley') connected to any one of ) and a power transmission member 212 connecting the motor pulley 214 and the feeder roll pulley 213 (e.g., Includes belts and chains.

When electricity is supplied to the electrical wiring connected to the drive motor 211, the drive motor 211 is driven. The driving force (rotational force) of the drive motor 211 is transmitted to the feeder roll pulley 213 by the motor pulley 214 and the power transmission member 212. Accordingly, one of the pair of feeder rolls 21 on which the feeder roll pulley 213 is disposed rotates. The separator 11 disposed between a pair of feeder rolls 21 moves as the feeder rolls 21 rotate. Due to this, the separator 11 unwound from the separator unwinder 12 moves at a preset speed up to the feeder roll 21 (specifically, until it passes between the pair of feeder rolls 21), The tension of the moving separator 11 is maintained constant.

Although not shown, according to an example of another embodiment of the present invention, the drive motor of the feeder roll driving unit may be directly connected to one of the pair of feeder rolls 21. Specifically, the rotation axis of the drive motor may be directly connected to the center of any one of the pair of feeder rolls 21. For example, a screw thread (male thread) is formed on the rotation axis of the drive motor, and the rotation axis is fastened to a screw groove formed in the center of the feeder roll 21 (a screw thread (female thread) is formed on the inner surface of the screw groove). The drive motor may be directly connected to either one of the pair of feeder rolls (21). In this example of the embodiment, the drive motor rotates the feeder roll 21 without the pulley and power transmission member described above.

The feeder roll driving unit (specifically, the driving motor) is controlled by a control unit (not shown). The control unit can adjust (control) the rotation speed of the drive motor 211 that constitutes the feeder roll drive unit. The feeder roll driving unit (specifically, the driving motor) rotates the feeder roll 21 at a preset speed in response to a control signal from the controller.

The guide roller 22 guides the separator 11 that has passed through the feeder roll 21 and covers the electrode plates sequentially stacked on the stack 30. The electrode plates represent a positive electrode plate 311 and a negative electrode plate 312.

The guide roller 22 is disposed between the feeder roll 21 and the stack 30. Specifically, the guide roller 22 is arranged to be spaced apart from the feeder roll 21 disposed upward by a preset distance in the downward direction. In addition, the guide roller 22 is arranged to be spaced apart from the stack 30 disposed downward by a preset distance in the upward direction.

The guide roller 22 is installed (or arranged) to be rotatable.

Specifically, the guide roller 22 is in a rotatable state (idle state) and is not directly or indirectly connected to a driving unit such as a motor. When the separator 11 that has passed through the feeder roll 21 is guided by the guide roller 22, the guide roller 22 rotates due to frictional force with the separator 11.

Guide rollers 22 are provided in pairs.

The pair of guide rollers 22 guide the separator 11 and cover the electrode plates laminated on the stack 30. That is, the separator 11 passes between the pair of guide rollers 22 and then is guided by the pair of guide rollers 22 and covered with the electrode plate.

A pair of guide rollers 22 moves to fold the separator 11 in a zigzag manner. Specifically, the pair of guide rollers 22 may move along an oval-shaped trajectory. Here, the oval-shaped trajectory represents the shape of the movement path of the guide roller 22.

Referring to Figure 4, the pair of guide rollers 22 reciprocates from the left-most position to the right-outmost position and from the right-outmost position to the left-outmost position along an oval-shaped trajectory.

A pair of guide rollers 22 reciprocates the distance from the outermost position on the left divided into sections A, B, and C to the outermost position on the right. Specifically, the pair of guide rollers 22 moves sequentially through section A, section B, and section C, and then sequentially moves through section C, section B, and section A. A pair of guide rollers repeats the above reciprocating movement.

The left outermost position indicates a position spaced apart by a preset distance to the left along the horizontal direction from the left end of the battery plate placed on the stack lamination unit 30. In Figure 4, section A represents the distance section from the left end of the panel to the leftmost position along the horizontal direction. In other words, the distance in section A represents the distance from the left end of the panel to the leftmost position along the horizontal direction. The distance of section A may vary depending on the length of the separator 11 covering the battery panel arranged in the horizontal direction.

The right outermost position indicates a position spaced a preset distance to the right along the horizontal direction from the right end of the battery plate placed on the stack lamination unit 30. In Figure 4, section C represents the distance section from the right end of the panel to the right outermost position along the horizontal direction. In other words, the distance in section C represents the distance from the right end of the panel to the right outermost position along the horizontal direction. The distance of section C may vary depending on the length of the separator 11 covering the battery panel arranged in the horizontal direction.

Meanwhile, in FIG. 4, section B is connected to section A and section C, and represents the distance section between section A and section C. That is, one end of section B is connected to section A, and the other end of section B is connected to section C. The distance of section B represents the distance between sections A and C along the horizontal direction. This is equal to the horizontal length of the panel arranged in the horizontal direction. Accordingly, the distance of section B may vary depending on the horizontal length of the battery panel arranged in the horizontal direction.

A pair of guide rollers 22 reciprocates along an oval-shaped trajectory to fold the separator 11 in a zigzag manner.

Specifically, the pair of guide rollers 22 moves from the outermost position on the left to the outermost position on the right, moving upward along an arc-shaped trajectory in section A, moving horizontally in section B, and moving in the horizontal direction in section C. In the section, it moves along an arc-shaped trajectory in the downward direction. At this time, the pair of guide rollers 22 performs a uniform acceleration movement in section A, a constant speed movement in section B, and a uniform deceleration movement in section C.

In addition, the pair of guide rollers 22 moves from the outermost position on the right to the outermost position on the left, moving upward along an arc-shaped trajectory in section C, moving horizontally in section B, and moving in the horizontal direction in section A. It moves along an arc-shaped trajectory in the downward direction. At this time, the pair of guide rollers 22 performs a uniform acceleration movement in section C, a constant speed movement in section B, and a uniform deceleration movement in section A.

As the section A and the section C perform constant acceleration and constant deceleration movement, the production speed of the cell stack 31 (cell stack), which will be described later, increases, resulting in improved production efficiency.

The section B is a section where the separator 11 covers the battery plate, and as the pair of guide rollers 22 moves at a constant speed in the horizontal direction in section B, the separator 11 is moved under a certain tension (a weak tension). It is possible to cover the battery panel flatly without wrinkles.

A pair of guide rollers 22 moves from the outermost position on the left to the outermost position on the right while drawing an oval-shaped trajectory. At this time, the separator 11 guided by the pair of guide rollers 22 covers the battery plate (for example, the positive plate 311) transferred to the stack table 32. Next, the pair of guide rollers 22 moves from the outermost position on the right to the outermost position on the left while drawing an oval-shaped trajectory. At this time, the separator 11 guided by the pair of guide rollers 22 covers the battery plate (for example, the negative plate 312) transferred to the stack table 32.

As the pair of guide rollers 22 repeats the reciprocating movement as described above, the positive electrode plate 311 and the negative electrode plate 312 are stacked with the separator 11 interposed therebetween. As the positive electrode plate 311 and the negative electrode plate 312 are stacked with the separator 11 in between, a cell stack 31, which will be described later, is formed.

After the separator 11 passes through the feeder roll 21, the tension of the separator 11 becomes lower than the tension of the separator 11 before the separator 11 passes through the feeder roll 21. Accordingly, the tension of the separator 11 that has passed through the feeder roll 21 is reduced (the separator 11 is released from the feeder roll 21). In this state, when the separator 11 is released by a preset length or while being released, the guide roller 22 moves from the leftmost position to the rightmost position along an oval-shaped trajectory, and the separator 11 is the guide roller. It covers the positive electrode plate 311 (or negative electrode plate 312) guided by 22 and transferred to the stack table 32. Then, when the separator 11 is unwound by a preset length or while it is unwound, the guide roller 22 moves from the outermost position on the right to the outermost position on the left along an oval-shaped trajectory, and the separator 11 is moved to the outermost position on the left. It covers the negative electrode plate 312 (or positive electrode plate 311) guided by (22) and transferred to the stack table 32. Here, the preset length of the separator 11 that has passed through the feeder roll 21 (i.e., the separator 11 in a state unwound from the feeder roll 21) may vary depending on the horizontal length of the panel arranged in the horizontal direction. there is.

As the pair of guide rollers 22 moves along the above-described oval-shaped trajectory, the separator 11 that has passed through the feeder roll 21 (the separator 11 in a state unwound from the feeder roll 21) is The battery plate is covered with a constant tension maintained by a pair of guide rollers 22. Here, constant tension can be seen as having a low value. Accordingly, the separator 11 covers the battery panel evenly without wrinkles.

The cell stack manufacturing device for secondary batteries according to an example of an embodiment of the present invention is a device that presses down and fixes (holds) the electrode plate on one outer surface of the electrode plate every time the separator 11 covers the electrode plate in a zigzag manner. ) Includes fixing members (not shown).

When the fixing member covers the battery plate on which the separator 11 is laminated, for example, by pressing and fixing one side of the electrode plate on the side covered with the separator 11 downward, the separator 11 is fixed to the guide roller ( It is guided by 22) and plays the role of fixing the electrode plate so that it does not move during the process of covering the electrode plate.

In section A when the pair of guide rollers 22 moves from the outermost position on the left to the outermost position on the right, and in section C when the pair of guide rollers 22 moves from the outermost position on the right to the outermost position on the left, a pair of guide rollers 22 As the scissors move along an arc-shaped trajectory in the upward direction, the pair of guide rollers 22 are able to avoid the fixing member. In addition, as the pair of guide rollers 22 lifts the separator 11 upward and moves it in the horizontal direction, the separator 11 in a state unwound from the feeder roll 21 is spread out flat without wrinkles.

The pair of guide rollers 22 may be equipped with a known movement driving device for the above-mentioned reciprocating movement. Here, the known movement driving device may include, for example, a drive motor, a reducer, a pulley, a belt, etc., and may include various connection members to be connected to the driving device.

The stack stacking unit 30 includes a cell stack 31 and a stack table 32.

The cell stack 31 is stacked in the stack lamination unit 30.

The stack lamination unit 30 is disposed below the tension adjustment unit 20.

The cell stack 31 has a structure in which a plurality of electrode plates are stacked with a separator 11 interposed therebetween. Here, the electrode plates represent a positive electrode plate 311 and a negative electrode plate 312.

Specifically, the cell stack 31 includes, for example, a positive electrode plate 311 laminated, a separator 11 covered on the positive electrode plate 311, a negative electrode plate 312 laminated on the separator 11, and the negative electrode plate 311. (312) It has a structure covered with a separator 11 on top. That is, the cell stack 31 has a structure in which positive electrode plates 311 and negative electrode plates 312 are alternately stacked with a separator 11 in between.

As described above, the cell stack 31 is formed as a pair of guide rollers 22 repeatedly guide the separator 11 released from the feeder roll 21 onto the battery panel while repeatedly moving back and forth.

The cell stack 31 is manufactured on the stack table 32.

The stack table 32 may not move. In other words, while the cell stack 31 is manufactured while the pair of guide rollers 22 repeatedly move back and forth, the stack table 32 may not move.

Additionally, the stack table 32 can move in the downward and upward directions.

The stack table 32 moves downward when one electrode plate is covered with the separator 11. Specifically, when one electrode plate transferred to the stack table 32 is covered with the separator 11, the stack table 32 moves downward by a preset length. Here, the preset length represents the combined length of the thickness of the separator 11 and the thickness of the electrode plate. Accordingly, the distance between the battery plates transferred from the feeder roll 21 to the stack table 32 is maintained constant.

The stack table 32 transfers the electrode plates constituting the other cell stack 31 when one cell stack 31 manufactured on the stack table 32 is removed (that is, transported to another location). Move upward to receive it. Accordingly, the distance between the battery plates transferred from the feeder roll 21 to the stack table 32 is maintained constant.

Although not shown, the secondary battery cell stack manufacturing device according to an example of the embodiment of the present invention is disposed on one side of the stack table 32 and transfers (moves) the positive plate 311 onto the stack table 32. It is provided with a positive electrode plate supply unit and a negative electrode plate supply unit disposed on the other side of the stack table 32 and transporting (moving) the negative electrode plate 312 onto the stack table 32.

The positive electrode plate supply unit and the negative electrode plate supply unit continuously supply the positive electrode plate 311 and the negative electrode plate 312 to the stack table 32.

The positive electrode plate supply unit and the negative electrode plate supply unit may be equipped with a known moving driving device and various connecting members to move the positive electrode plate 311 and the negative electrode plate 312.

As described above, the stack table 32 may not move while the guide roller 22 repeats the reciprocating movement, but according to an example of another embodiment of the present invention, the stack table 32 has a certain shape (trajectory) You can move to .

According to an example of another embodiment of the present invention, the stack table 32 moves in the downward and upward directions. Specifically, the stack table 32 moves downward and upward while one electrode plate is covered with the separator 11. Figure 5 shows an example of another embodiment of the stack 30.

Referring to Figure 5, when the pair of guide rollers 22 is moving between the left-most position and the right-outmost position, the stack table 32 maintains the tension of the separator 11 constant. From the first position, it moves downward a preset distance to reach the second position, and then moves upward again a preset distance. When the pair of guide rollers 22 are at (or arrive at) the left outermost position and the right outermost position, the stack table 32 is positioned in the first position.

The downward movement and the upward movement of the pair of guide rollers 22 are continuously performed each time electrode plates are stacked.

The movement path of the pair of guide rollers 22 and the stack table 32 is explained as an example as follows.

When the pair of guide rollers 22 is at the left-most outer position, the stack table 32 is located at the first position, and when the pair of guide rollers 22 is at the left-most outer position, the stack table 32 begins to move to the second position, and when the pair of guide rollers 22 arrives at the middle part of the left outermost position and the right outermost position, the stack table 32 reaches the second position, and the pair of guide rollers 22 When the guide roller 22 passes the middle portion, the stack table 32 starts moving back to the first position. Then, when the pair of guide rollers 22 arrives at the outermost position on the right, the stack table 32 is positioned at the first position. Here, the second position represents a position spaced apart from the first position by a preset distance in the downward direction.

Then, when the pair of guide rollers 22 starts from the right outermost position, the stack table 32 starts moving to the second position, and the pair of guide rollers 22 starts at the right outermost position and the left outermost position. Upon reaching the middle part of the position, the stack table 32 reaches the second position, and when the pair of guide rollers 22 passes the middle part, the stack table 32 starts moving back to the first position. Then, when the pair of guide rollers 22 arrives at the outermost position on the left, the stack table 32 is positioned at the first position.

The downward and upward movements of the pair of guide rollers 22 described above are continuously performed each time electrode plates are stacked.

As described above, the cell stack manufacturing apparatus for secondary batteries according to examples of embodiments of the present invention can control the tension of the separator 11 moving from the separator unwinder 12 through the tension control unit 20. there is.

Specifically, the secondary battery cell stack manufacturing device of the present invention adjusts (controls) the rotation speed of the feeder roll 21, thereby controlling the separation of the separator 11 moving from the separator unwinder 12 to the feeder roll 21. Tension can be adjusted (controlled).

Specifically, the secondary battery cell stack manufacturing apparatus of the present invention can maintain the tension of the separator 11 by the moving speed and/or moving trajectory of the guide roller 22 after the tension cut.

Specifically, the secondary battery cell stack manufacturing device of the present invention adjusts (controls) the rotational speed of the feeder roll 21 according to the moving speed and/or moving position (trajectory) of the guide roller 22 after the tension cut. The tension of the separator 11 can be adjusted (controlled).

The secondary battery cell stack manufacturing apparatus according to examples of the present invention can adjust (control) the tension of the separator 11, improve the efficiency of producing the cell stack 31, and prevent the generation of separator wrinkles. Reliability of the product can be improved by reducing defects caused by

The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the above description focuses on the embodiment, this is only an example and does not limit the present invention, and those skilled in the art will be able to understand the above without departing from the essential characteristics of the present embodiment. You will see that various modifications and applications not illustrated are possible. In other words, each component specifically shown in the implementation state can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

10: Separator supply unit
11: Separator
12: Separator unwinder
13: Separator traveling roller
14: Dancer Department
141: Dancer Roll
142: First support member
143: Second support member
20: Tension control unit
21: Feeder roll
211: motor
212: Absence of power transmission
213: Feeder roll pulley
214: motor pulley
22: Guide roller
30: Stack lamination section
31: cell stack
311: positive plate
312: negative plate
32: Stack table

Claims (17)

A separator supply unit that supplies a separator;
a tension control unit that adjusts the tension of the separator moved from the separator supply unit; and
It includes a stack lamination section disposed below the tension adjusting section,
A cell stack manufacturing device for a secondary battery, wherein the tension adjusting unit includes a feeder roll rotated by a feeder roll driving unit to adjust the tension of the separator.
According to paragraph 1,
The separator supply unit,
A separator unwinder in which the separator is wound;
a plurality of separator traveling rollers that guide the separator unwound from the separator unwinder to the tension control unit; and
A cell stack manufacturing device for a secondary battery, comprising a dancer part disposed between the separator unwinder and the tension adjuster.
According to paragraph 2,
The dancer department,
a plurality of dancer rolls rotating by movement of the separator;
A first support member supporting some of the dancer rolls among the plurality of dancer rolls; and
A cell stack manufacturing apparatus for a secondary battery, comprising a second support member that supports another part of the dancer roll among the plurality of dancer rolls and is disposed to be spaced apart from the first support member by a preset distance.
According to paragraph 3,
The cell stack manufacturing device for a secondary battery, wherein the first support member moves or rotates with one side of the first support member as a central axis.
According to paragraph 3,
The second support member moves or rotates with one side of the second support member as a central axis.
According to paragraph 3,
The first support member and the second support member are capable of rotating while moving.
According to paragraph 1,
The tension control unit,
The feeder roll provided as a pair;
The feeder roll driving unit that rotates the pair of feeder rolls; and
It includes a guide roller disposed between the pair of feeder rolls and the stack lamination unit,
The separator passes between the pair of feeder rolls and moves to the guide roller.
In clause 7,
The guide roller is provided in a pair, and guides the separator passing between the pair of feeder rolls to cover the electrode plates sequentially stacked on the stack stack.
According to clause 8,
A cell stack manufacturing device for a secondary battery, wherein the pair of guide rollers reciprocate from the left-most position to the right-outmost position, and from the right-outmost position to the left-most position.
According to clause 9,
A cell stack manufacturing device for a secondary battery, wherein the pair of guide rollers reciprocate the distance from the outermost position on the left divided into sections A, B, and C to the outermost position on the right.
According to clause 10,
The pair of guide rollers moves from the left outermost position to the right outermost position, moves upward along an arc-shaped trajectory in the section A, moves horizontally in the section B, and moves in the horizontal direction in the section C. A secondary battery cell stack manufacturing device that moves along an arc-shaped trajectory in a downward direction in the section.
According to clause 11,
A cell stack manufacturing device for a secondary battery, wherein the pair of guide rollers performs a uniform acceleration movement in the section A, a constant speed movement in the section B, and a uniform deceleration movement in the section C.
According to clause 10,
The pair of guide rollers moves from the right outermost position to the left outermost position, moves upward along an arc-shaped trajectory in the section C, moves horizontally in the section B, and moves in the horizontal direction in the section A. A secondary battery cell stack manufacturing device that moves along an arc-shaped trajectory in a downward direction in the section.
According to clause 13,
A cell stack manufacturing device for a secondary battery, wherein the pair of guide rollers performs a uniform acceleration movement in the section C, a constant speed movement in the section B, and a uniform deceleration movement in the section A.
According to paragraph 1,
The stack lamination unit,
A cell stack in which a plurality of electrode plates are stacked with the separator interposed therebetween; and
Includes a stack table where the cell stack is arranged,
The stack table is a secondary battery cell stack manufacturing device that moves downward when one electrode plate is covered with the separator.
According to paragraph 1,
The stack lamination unit,
A cell stack in which a plurality of electrode plates are stacked with the separator interposed therebetween; and
A cell stack manufacturing device for a secondary battery, comprising a stack table on which the cell stack is placed.
According to clause 16,
The stack table is a secondary battery cell stack manufacturing device that moves downward and upward while one electrode plate is covered with the separator.

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