Title of Invention: Pressing Roll Device and Pressing Method
technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0167120 dated December 13, 2019, and all contents disclosed in the documents of the Korean patent applications are incorporated as a part of this specification.
[2]
The present invention relates to a pressing roll device for pressing by applying pressure when manufacturing a unit cell in which an electrode (anode, anode) and a separator are laminated, and a pressing method using the pressing roll device, and more particularly, the electrode and the separator The present invention relates to a pressing roll device and a pressing method capable of minimizing damage to electrodes and separators by entering in a state in which the upper roll and the lower roll are spaced apart when entering the stacked state.
[3]
background
[4]
Secondary batteries, unlike primary batteries, are rechargeable, and have been widely researched and developed in recent years due to their small size and large capacity. As technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing.
[5]
A secondary battery is configured by embedding an electrode assembly in a battery case (pouch, can, etc.). The electrode assembly mounted on the inside of the battery case has a repeated stacking structure of positive electrode/separator/negative electrode, so that repeated charging and discharging is possible. Although the electrode assembly is manufactured in a variety of ways, it is common to manufacture the unit cells in advance and then stack a plurality of the unit cells to make the manufacturing.
[6]
The manufacturing process of the unit cell includes a laminating process for bonding the separator and the electrode, and the laminating process is configured such that the negative electrode, the separator, and the positive electrode are continuously unwound and supplied in a rolled-up state. At this time, two or more of the separators are usually continuously supplied, and the cathode and the anode are supplied to be stacked between the separators and on top of the uppermost separator, and the separator is cut to a predetermined size and put into the anode with the separators interposed therebetween. and the cathode are alternately stacked.
[7]
Then, the separator is continuously connected, and passes through the laminating device in a state in which an anode and a cathode are alternately stacked between the separators. In the laminating apparatus, heat and pressure are applied to bond the positive electrode, the separator, and the negative electrode. And, after passing through the laminating device, the separation membrane is cut and manufactured into individual unit cells.
[8]
At this time, the laminating apparatus includes a pressing roll apparatus in which the positive electrode, the separator, and the negative electrode pass between the two rolls and pressurized.
[9]
Referring to FIG. 1 showing the state in which the upper roll and the lower roll are in contact with each other in the conventional press roll device (a) and the state in which the upper roll and the lower roll are spaced apart (b), the conventional press roll device has a positive electrode, a separator, and a negative electrode. When passing in this stacked state, it includes an upper roll 2a and a lower roll 1a arranged to be respectively positioned up and down there, wherein the lower roll 1a is rotatably rotatable on the lower mount 1 is mounted, and the upper roll (2a) is rotatably mounted on the upper mount (2). At this time, the lower mount (1) is fixed in movement, while the upper mount (2) is connected to the motor (4) through the bracket (3) and the screw (5) and rises and falls according to the rotational direction of the motor (4). descent takes place
[10]
However, in such a structure, it was difficult to maintain a constant distance between the upper roll 2a and the lower roll 1a due to vibration (and impact) generated by mechanical devices during the laminating process, and the thickness of the cathode and anode during manufacturing In case of deviation, excessive pressure is applied to the stacked anode and cathode, which may cause damage or deformation.
[11]
In order to solve the above problem, if the space between the upper roll 2a and the lower roll 1a is too far apart, the compression pressure may be lowered and the adhesive force may be lowered.
[12]
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[13]
Accordingly, the main object of the present invention is to provide a compression roll device and a compression method that can solve or at least improve the above problems that may occur in the conventional compression roll device.
[14]
means of solving the problem
[15]
In the pressing roll device according to the present invention for achieving the object as described above, the pressing roll device for passing a unit cell between the upper roll and the lower roll, the lower roll; upper roll; a lower mount on which the lower roll is mounted and the movement is fixed; an upper mount on which the upper roll is mounted and constrained by a bracket and capable of ascending and descending by the bracket; and a stopper disposed between the lower mount and the upper mount so that the lower roll and the upper roll are spaced apart.
[16]
At this time, the upper mount includes a head portion protruding from the upper surface, the head portion includes a body portion vertically protruding from the upper surface of the upper mount and an extension portion having an increased diameter at the upper end of the body portion, the head portion of the bracket Doedoe coupled so that the detachment of the extension part is restrained by the tongs, the upper mount is constrained by the bracket within the range in which the tongs come into contact with the upper surface of the upper mount while the bracket is fixed or the tongs come into contact with the extension. Ascent and descent are permitted.
[17]
When the upper mount is seated on the stopper, a gap is formed between the clamp part and the extension part and between the clamp part and the upper surface of the upper mount, respectively.
[18]
The bracket is connected to the motor, and may be raised or lowered according to the rotation direction of the motor.
[19]
The stopper may be equipped with a damping member for buffering an impact when the upper mount is seated.
[20]
In the present invention, the stopper has a bar shape that is erected vertically from the lower mount, and is expandable and contractible along the longitudinal direction so as to adjust the spaced distance between the lower mount and the upper mount.
[21]
The stopper includes a fixing part that can be fixed to the lower mount; and a slide portion slidable to ascend and descend in the longitudinal direction from the fixing portion. The sliding of the sliding part may be achieved through pneumatic, hydraulic, as well as a motor.
[22]
In addition, the present invention additionally provides a pressing method for pressing the unit cell between the upper roll and the lower roll. The crimping method according to the present invention is a crimping method in which a unit cell is passed between the upper roll and the lower roll to be compressed. an upper roll mounted on an upper mount; and passing a unit cell therebetween, wherein when the unit cell passes between the upper roll and the lower roll, the upper roll and the lower roll are spaced apart by a predetermined distance.
[23]
At this time, when the unit cell passes between the upper roll and the lower roll, the pressure applied to the unit cell is the weight of the upper mount and the upper roll.
[24]
On the other hand, when a unit cell having a thickness within a certain range passes between the upper roll and the lower roll, only the weight of the upper mount and the upper roll acts as a pressure on the unit cell, but the unit cell having a thickness greater than that is the upper roll and the lower roll. When passing through, the weight of the upper mount and upper roll and the force acting from the bracket are added to act as a pressure on the unit cell.
[25]
It may include mounting a stopper between the lower mount and the upper mount before the passage of the unit cell so as to space the lower roll and the upper roll apart.
[26]
Therefore, the present invention can additionally provide a unit cell manufactured by the compression method as described above.
[27]
Effects of the Invention
[28]
In the present invention having the above configuration, the stopper capable of ascending and descending is arranged on the lower mount and the upper mount, so that the distance between the upper roll and the lower roll can be maintained more easily and reliably, and the length of the stopper can be adjusted. The gap between the roll and the lower roll can be adjusted.
[29]
At this time, when the upper mount is seated on the stopper, a gap is formed between the clamp part and the extension part and between the clamp part and the upper surface of the upper mount, respectively, so that the stopper supports only the load of the upper mount and the upper roll. Damage can be minimized when the electrode passes. That is, in the conventional structure, pressure can act on the electrode up to the fixing force of the upper mount and the motor, but in the present invention, the initial pressure applied to the electrode can be lowered and, if necessary, the pressure transmitted from the motor can be added.
[30]
And, the stopper is equipped with a damping member for cushioning the impact when the upper mount is seated, it is possible to prevent deterioration of durability due to the impact.
[31]
Brief description of the drawing
[32]
1 is a view showing a state in which an upper roll and a lower roll are in contact (a) and a state in which the upper roll and the lower roll are spaced apart (b) in a conventional compression roll apparatus.
[33]
2 is a view showing a state in which the upper mount descends to the lowest in the pressing roll device according to the present invention.
[34]
3 is a view showing a state in which the upper mount is raised in FIG. 2 .
[35]
4 is a view illustrating a state in which a damping member is mounted on a stopper;
[36]
5 is a view showing a state in which the length of the stopper is increased as the sliding portion rises from the fixing portion of the stopper;
[37]
6 is a view showing a comparison between the conventional compression roll device (left) and the compression roll device of the present invention (right).
[38]
Modes for carrying out the invention
[39]
Hereinafter, based on the accompanying drawings, the present invention will be described in detail so that those of ordinary skill in the art can easily implement it. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein.
[40]
In order to clearly explain the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar elements throughout the specification.
[41]
In addition, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor appropriately defines the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of ​​the present invention based on the principle that it can be done.
[42]
The present invention relates to a pressing roll device and a pressing method that are included in a laminating apparatus for manufacturing a unit cell and pass a unit cell between an upper roll and a lower roll. It will be described in more detail.
[43]
[44]
first embodiment
[45]
[46]
The present invention provides a pressing roll device for passing a unit cell between the upper roll 21 and the lower roll 11 as a first embodiment.
[47]
2 is a view showing a state in which the upper mount 20 is lowered to the lowest in the pressing roll device according to the present invention, and FIG. 3 is a view showing the state in which the upper mount 20 is raised in FIG. 2 .
[48]
2 and 3, the compression roll apparatus of the present invention includes an upper mount 20 and a lower mount 10 to which an upper roll 21 and a lower roll 11 are coupled, respectively.
[49]
The upper roll 21 and the lower roll 11 are made of a material having enough rigidity to apply an appropriate pressure to the electrode and the separator, and have a cylindrical shape. In addition, the upper mount 20 and the lower mount 10 are mounted so that rotation is allowed at the center of both sides of the upper roll 21 and the lower roll 11, respectively.
[50]
That is, the lower mount 10 is mounted with the lower roll 11 so that rotation is allowed, and the movement is fixed. On the other hand, the upper mount 20 is similarly mounted with an upper roll 21 to allow rotation, and the upper mount 20 is restrained from moving and departing by the bracket 30 and is raised by the bracket 30 . It is configured to be able to descend.
[51]
In addition, a stopper 60 is disposed between the lower mount 10 and the upper mount 20 so that the lower roll 11 and the upper roll 21 are spaced apart.
[52]
On the other hand, in the present invention, the upper mount 20 has a head portion 22 protruding from the upper surface. The head part 22 includes a body part 23 vertically protruding from the upper surface of the upper mount 20 and an extension part 24 having an increased diameter at the upper end of the body part 23 . In addition, the bracket 30 is provided with tongs 31 facing downward, and the head 22 is coupled such that separation of the extension 24 is restrained by the tongs 31 of the bracket 30 . do. As shown, the bracket 30 has a space in which the head 22 is accommodated, and the tongs 31 have a function to support the bracket 22 so as not to be separated downward when the bracket 22 enters the space. provides
[53]
At this time, in a state in which the bracket 30 is fixed, the bottom surface of the tongs 31 is in contact with the upper surface of the upper mount 20 or the upper surface of the tongs 31 is in contact with the extension 24 . Within this range, the upper mount 20 is allowed to rise and fall while the bracket 30 is restrained. That is, according to the length of the body portion 23, the range in which the rising and falling is allowed is proportional.
[54]
When the upper mount 20 is seated on the stopper 60 according to the length of the stopper 60 in a state where the height of the bracket 30 is fixed, the position of the tongs 31 is 31) and the extension part 24 and between the clamp part 31 and the upper surface of the upper mount 20, respectively, is configured to form a gap.
[55]
That is, in this arrangement, when the electrode and the separator pass through the upper roll 21 and the lower roll 11, only the weight of the upper roll 21 and the upper mount 20 acts as a pressure. do. And, when the bracket 30 is lowered and the tongs 31 press the upper surface of the upper mount 20, the force transmitted through the bracket 30 is added to act as a pressure on the electrode and the separator.
[56]
On the other hand, the bracket 30 is configured to be able to rise and fall by the motor 40 . The motor 40 and the bracket 30 are connected through a screw 50 that converts the rotational force of the motor 40 into an upward and downward movement of the bracket 30, and rises according to the rotational direction of the motor 40 or configured to descend. For reference, instead of the motor 40, the bracket 30 may be configured to be raised and lowered by pneumatic or hydraulic pressure. It is preferable that the ascending and descending is configured by the rotation of the .
[57]
In addition, when the upper mount 20 is seated on the stopper 60 , a damping member 61 may be mounted on the stopper 60 to suppress the generation of an impact sound and increase mechanical durability. That is, as shown in FIG. 4 that the damping member 61 is mounted on the upper end of the stopper 60, the stopper 60 of the present invention provides a shock absorber at any one or more of the upper end or the lower end. A damping member 61 may be added.
[58]
In addition, in the present invention, the stopper 60 can be stretched and contracted in the longitudinal direction to adjust between the upper mount 20 and the lower mount 10 . That is, as shown in FIG. 5 showing an increase in the length of the stopper 60 due to the rise of the slide portion 63 from the fixed portion 62 of the stopper 60, the stopper 60 of the present invention is a fixed portion ( 62 ) and a slide portion 63 .
[59]
The fixing part 62 has a bar shape that is erected vertically from the lower mount 10 , and is fixedly coupled to the lower mount 10 . And, the slide portion 63 is configured to be slidable so as to ascend and descend along the longitudinal direction in the fixing portion 62 . The sliding part 63 and the fixing part 62 can ascend and descend by injecting compressed air in the internal space between them or by mounting a rack and a pinion gear in the internal space and rotating the rack and pinion gear with a motor. configurable.
[60]
In the compression roll device of the present invention having such a configuration, as shown in FIG. 6 in which the conventional compression roll device (left) and the compression roll device (right) of the present invention are compared, the unit cell (U) has an upper portion When passing through the roll 21 and the lower roll 11, it is possible to prevent damage and displacement of the electrode included in the unit cell (U) by providing a free space for the upper mount 20 to rise. .
[61]
[62]
second embodiment
[63]
[64]
In addition, the present invention provides a pressing method for pressing the unit cell between the upper roll and the lower roll using the pressing roll device provided in the first embodiment as a second embodiment.
[65]
The pressing method according to the present invention is a pressing method in which a unit cell (U) is passed between the upper roll 21 and the lower roll 11 to be compressed. ) and the step of passing the unit cell (U) between the upper roll 21 mounted on the upper mount 20, which is allowed to ascend and descend in a state in which separation from the bracket 30 is constrained.
[66]
At this time, when the unit cell (U) passes between the upper roll 21 and the lower roll 11, the upper roll 21 and the lower roll 11 is characterized in that it is spaced apart by a predetermined distance. That is, in the conventional method, the upper roll and the lower roll are in contact, and when the electrode of the unit cell passes, the load is concentrated on the corners of the negative electrode and the positive electrode stacked on the unit cell, so that the negative electrode and the positive electrode are damaged or Although it was possible to deviate from the seated position, in the present invention, since the upper roll 21 and the lower roll 11 are spaced apart, the amount of impact initially applied from the negative electrode and the positive electrode can be reduced.
[67]
At this time, the upper mount 20 is in a state constrained by the bracket 30 but can rise and fall as much as a certain range (a gap formed between the clamp part and the extension part and between the clamp part and the upper surface of the upper mount), so the unit cell The pressure acting on the upper mount 20 and the upper roll 21 act by their own weight.
[68]
On the other hand, when a unit cell having a thickness in a certain range passes between the upper roll 21 and the lower roll 11, only the weight of the upper mount 20 and the upper roll 21 acts as a pressure on the unit cell, but the When a unit cell having a thickness equal to or greater than that passes between the upper roll 21 and the lower roll 11, the weight of the upper mount 20 and the upper roll 21 and the force acting from the bracket 30 are added to the unit cell. act as pressure
[69]
Therefore, the step of mounting the stopper 60 between the lower mount 10 and the upper mount 20 before the passage of the unit cell to space the lower roll 11 and the upper roll 21 is included. can
[70]
In addition, the present invention may additionally provide a unit cell manufactured by the compression method as described above.
[71]
[72]
In the present invention having the above configuration, the stopper 60 capable of ascending and descending is disposed between the lower mount 10 and the upper mount 20, so that it is more easily and reliably between the upper roll 21 and the lower roll 11. The distance can be maintained, and since the length of the stopper 60 can be adjusted, the distance between the upper roll 21 and the lower roll 11 can be adjusted.
[73]
At this time, when the upper mount 20 is seated on the stopper 60, there is a gap between the clamp part 31 and the extension part 24 and between the clamp part 31 and the upper surface of the upper mount 20, respectively. Since the stopper 60 is seated so as to support only the load of the upper mount 20 and the upper roll 21, damage can be minimized when the electrode passes. That is, in the conventional structure, pressure can act on the electrode up to the fixing force of the upper mount and the motor, but in the present invention, the initial pressure applied to the electrode can be lowered and, if necessary, the pressure transmitted from the motor can be added.
[74]
In addition, the stopper 60 is equipped with a damping member 61 that cushions the impact when the upper mount 20 is seated, thereby preventing deterioration of durability due to the impact.
[75]
In the above, although the present invention has been described with reference to limited examples and drawings, the present invention is not limited thereto, and it is described below with the technical idea of ​​the present invention by those of ordinary skill in the art to which the present invention pertains. Various implementations are possible within the scope of equivalents of the claims to be made.
Claims
[Claim 1]
A pressing roll device for passing a unit cell between an upper roll and a lower roll, comprising: a lower roll; upper roll; a lower mount on which the lower roll is mounted and the movement is fixed; an upper mount on which the upper roll is mounted and constrained by a bracket and capable of ascending and descending by the bracket; and a stopper disposed between the lower mount and the upper mount so that the lower roll and the upper roll are spaced apart.
[Claim 2]
According to claim 1, wherein the upper mount comprises a head portion protruding from an upper surface, the head portion comprises a body portion vertically protruding from the upper surface of the upper mount and an extension having an increased diameter at the upper end of the body portion, the The head part is coupled so that the detachment of the extension part is restrained by the clamp part of the bracket, and the clamp part comes into contact with the upper surface of the upper mount or the clamp part comes into contact with the extension part when the bracket is fixed. is a compression roll device, characterized in that it is allowed to ascend and descend with the brackets restrained.
[Claim 3]
The compression roll apparatus according to claim 2, wherein, when the upper mount is seated on the stopper, a gap is formed between the tongs and the extension and between the tongs and the upper surface of the upper mount, respectively.
[Claim 4]
The compression roll apparatus according to claim 2, wherein the bracket is connected to a motor and rises or falls according to a rotational direction of the motor.
[Claim 5]
[2] The compression roll device according to claim 1, wherein the stopper is equipped with a damping member for cushioning an impact when the upper mount is seated.
[Claim 6]
[2] The compression roll device according to claim 1, wherein the stopper has a bar shape standing vertically from the lower mount, and is expandable and contractible along the longitudinal direction so as to adjust the spaced distance between the lower mount and the upper mount. .
[Claim 7]
7. The device of claim 6, wherein the stopper comprises: a fixing part fixable to a lower mount; and a sliding portion slidable to ascend and descend from the fixing portion in the longitudinal direction.
[Claim 8]
A compression method for pressing a unit cell by passing a unit cell between an upper roll and a lower roll, the lower roll mounted on a fixed lower mount; upper roll; and passing a unit cell therebetween, wherein when the unit cell passes between the upper roll and the lower roll, the upper roll and the lower roll are spaced apart by a predetermined distance.
[Claim 9]
The method of claim 8, wherein when the unit cell passes between the upper roll and the lower roll, the pressure applied to the unit cell is the weight of the upper mount and the upper roll.
[Claim 10]
10. The method of claim 9, When the unit cell having a thickness in a certain range passes between the upper roll and the lower roll, only the weight of the upper mount and the upper roll acts as a pressure on the unit cell, but the unit cell having a thickness greater than that is the upper part. When passing between the roll and the lower roll, the pressure applied to the unit cell is applied by adding the weight of the upper mount and the upper roll and the force acting from the bracket.
[Claim 11]
The method of claim 8 , further comprising mounting a stopper between the lower mount and the upper mount prior to passage of the unit cell so as to space the lower roll and the upper roll apart.
[Claim 12]
A unit cell manufactured by the compression method according to claim 8.