JP2018060695A - Press roll device for battery production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a battery in which strips of a second electrode foil are arranged on a piece of a first electrode foil piece with a space therebetween, and can be pressed by appropriately applying a pressing force without damaging the strip of the second electrode foil. To provide a press roll device. SOLUTION: A first roll 5 on the second electrode foil strip side in a press roll pair that presses a first electrode foil piece 12 and a second electrode foil strip 13 thereon in a thickness direction has a cylindrical sleeve member 26. And an eccentric member 27 therein. Only the sleeve member rotates with the progress of the first electrode foil piece, and the height of the eccentric member with respect to the first electrode piece piece varies by swinging around the position 19 offset from the press position. Is. Further, an eccentric member is provided with the lever bar 23, and a pressing force generating portion 24 for generating a pressing force to the lever bar and a stopper member 25 for restricting the swing of the lever bar are provided. The lever length of the lever bar is set larger than the offset amount of the eccentric member. [Selection diagram] Fig. 3

Description

  The present invention relates to a press roll for manufacturing a battery, which is laminated on a long first electrode foil fabric so that a plurality of second electrode foil strips are arranged at intervals in the longitudinal direction to obtain an electrode laminate. It relates to the device.

  2. Description of the Related Art Conventionally, secondary batteries and other batteries that incorporate an electrode stack in which first electrodes and second electrodes are alternately stacked have been used. Such an electrode laminate includes a structure in which strip-like foils are used as the first electrode and the second electrode, and these are laminated in a flat stack.

  As a prior art that can be used for manufacturing an electrode laminate having such a laminated structure, there is a continuous compression device described in Patent Document 1. In the technique of this document, a layer of “electrode active material 2 b” intermittently applied on the surface of a strip-like “metal foil current collector 2 a” is compressed between two “compression rolls 4”. Therefore, the thickness is adjusted ([0020] of FIG. 2, FIG. 2). In the technique of this document, a “hydraulic pressure reducing device 8” for adjusting the gap between the two “compression rolls 4” is further provided. As a result, the electrode strip is prevented from being broken by an impact when a portion of the new “electrode active material 2 b” reaches the compression location by the “compression roll 4” ([0033] of the same document).

JP 2012-216465 A

  However, when the above-described conventional technique is used for manufacturing a laminated body of the first electrode and the second electrode, there are the following problems. That is, various problems were caused when trying to press with the "compression roll 4" what the second electrode foil strips were arranged on the first electrode foil fabric with a space therebetween. For example, it is extremely difficult to ensure the pressing force and prevent the second electrode foil strip from being damaged. If the gap of the “compression roll 4” is too large, no pressing force is applied, and if the gap is too small, the second electrode foil strip is damaged. This is because the second electrode foil strip itself is a structure including a metal portion and is different from the layer of “electrode active material 2b”. Furthermore, since the second electrode foil strip is very thin, the appropriate range for the gap of the “compression roll 4” is extremely narrow. For this reason, the accuracy of the gap adjustment in the piston type “hydraulic reduction device 8” described in Patent Document 1 is too low.

  The present invention has been made to solve the above-described problems of the prior art. In other words, the problem is that the second electrode foil strips are arranged on the first electrode foil fabric with a gap between them without applying damage to the second electrode foil strips. It is providing the press roll apparatus for battery manufacture which can be pressed.

  The press roll apparatus for manufacturing a battery according to one aspect of the present invention includes a plurality of first electrode foil fabrics and second electrode foil strips which are electrode laminates, spaced apart in the longitudinal direction on the first electrode foil fabrics. A device for laminating so that the second electrode foil strips are arranged, comprising a pair of press rolls for pressing the first electrode foil fabric and the second electrode foil strips placed thereon in the thickness direction. ing. The first roll located on the second electrode foil strip side of the press roll pair is a cylindrical sleeve member that rotates with the progress of the first electrode foil fabric, and the first electrode foil fabric that is located in the sleeve member. And an eccentric member that swings with the sleeve member around a position offset in the direction of travel of the first electrode foil workpiece against the press position of the press roll pair. A lever bar that is formed to extend outward in the radial direction of one roll and swings with the swing of the eccentric member, and the bar to the bar in a direction in which the first roll is pressed against the first electrode foil fabric and the second electrode foil strip. A pressing force generating part that generates a pressing force and a stopper member that restricts the swinging of the lever bar due to the pressing force of the pressing force generating part. Here, in the press roll apparatus for manufacturing a battery according to this aspect, the lever length from the position of the swinging central axis of the eccentric member to the position where the lever bar is restricted by the stopper member is set in the press direction of the first electrode foil fabric. The amount of offset is larger than the offset amount between the position and the oscillation center axis position.

  In the press roll apparatus for manufacturing a battery according to the above aspect, only the cylindrical sleeve member rotates in the first roll as the first electrode foil fabric moves. The eccentric member inside thereof does not rotate with the progress of the first electrode foil fabric, but swings around a position offset with respect to the press position. Due to this swinging, the pressing amount of the first roll against the first electrode foil fabric and the second electrode foil strip varies. A lever bar is attached to the eccentric member, and when the lever bar receives the pressing force of the pressing force generating portion, a pressing force against the first electrode foil fabric and the second electrode foil strip of the first roll is generated. It is like that. However, the movement of the lever bar due to the pressing force of the pressing force generator is restricted by the stopper member. This prevents the first roll from excessively swinging toward the first electrode foil fabric and the second electrode foil strip. Due to the lever ratio of the lever bar, the position of the first roll can be precisely adjusted by adjusting the restriction position by the stopper member.

  According to this configuration, the second electrode foil strips arranged on the first electrode foil fabric can be pressed with a suitable pressing force without damaging the second electrode foil strips. A press roll device for battery manufacture is provided.

It is a schematic diagram which shows the structure of the laminated battery manufacturing apparatus which concerns on embodiment. It is a perspective view which shows the press roll apparatus which concerns on embodiment. It is a front view which shows a bonding roll and a lever bar. It is a schematic diagram which shows the condition where the impact by a bonding roll is applied to a positive foil strip. It is a schematic diagram which shows the condition where the impact by a bonding roll is not applied to a positive foil strip. It is a front view which shows the condition where the positive foil strip is actually pressed by the bonding roll.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the accompanying drawings. In this embodiment, the present invention is embodied as the laminated battery manufacturing apparatus 1 shown in FIG. First, the laminated battery manufacturing apparatus 1 will be described.

  A laminated battery manufacturing apparatus 1 in FIG. 1 includes a positive electrode fabric supply unit 2, a negative electrode fabric supply unit 3, a positive electrode fabric cutting mechanism 4, a bonding roll 5, a negative electrode workpiece cutting mechanism 6, a pedestal 7, and a press roll. 8. A cathode foil fabric object coil 9 is attached to the cathode fabric object supply unit 2 so that the cathode foil fabric object 10 is unwound. A negative electrode foil fabric object coil 11 is attached to the negative electrode fabric object supply unit 3 so that the negative electrode foil fabric object 12 is unwound. Both the positive electrode foil fabric 10 and the negative electrode foil fabric 12 are long foils, and have a structure in which an electrode active material layer is formed on the surface of the current collector foil. A separator layer is also formed on the surface of the negative electrode foil fabric 12. Both the positive foil fabric 10 and the negative foil fabric 12 proceed in the longitudinal direction toward the bonding roll 5.

  The positive electrode fabric cut mechanism 4 cuts the positive foil fabric 10 in the width direction to form a card-like positive foil strip 13. The laminating roll 5 is for laminating the negative electrode foil fabric 12 and the positive foil strip 13. Therefore, the negative electrode foil fabric 12 is supplied to the laminating roll 5 as it is, and the positive foil fabric 10 is cut into a positive foil strip 13 before being supplied. Further, the positive foil strip 13 is supplied to the laminating roll 5 with an interval in the longitudinal direction of the negative foil workpiece 12.

  The negative electrode workpiece cut mechanism 6 cuts the negative electrode foil workpiece 12 in the width direction. By this cutting, an electrode foil pair strip 14 in which the positive foil strip 13 and the negative foil strip are laminated one by one is obtained. The pedestal 7 is for placing the obtained electrode foil pair strip 14. The press roll 8 presses a plurality of electrode foil pair strips 14 laminated on the base 7 in the thickness direction. A nip roll 16 that supports the negative electrode foil fabric 12 and the positive foil strip 13 is provided immediately upstream of the negative electrode workpiece cutting mechanism 6.

  Next, the operation of the laminated battery manufacturing apparatus 1 will be described. When the electrode stack 15 is manufactured by the stacked battery manufacturing apparatus 1, the negative foil foil 12 and the positive foil strip 13 are supplied to the bonding roll 5. The negative electrode foil fabric 12 is supplied from the negative electrode fabric supply unit 3 as described above, and reaches the laminating roll 5 by proceeding in the longitudinal direction. The positive foil strip 13 is supplied to the laminating roll 5 by the positive electrode fabric supply unit 2 and the positive electrode fabric cutting mechanism 4. In the bonding roll 5, the positive foil strip 13 is arranged on the negative foil fabric 12 with a gap in the longitudinal direction.

  Then, the positive foil strip 13 and the negative foil foil 12 are lightly pressed in the thickness direction by the bonding roll 5. In this state, the positive foil strip 13 is lightly adhered to the negative foil foil 12. This is because the separator layer of the negative electrode foil fabric 12 has a certain degree of adhesiveness. Therefore, thereafter, the position of the positive foil strip 13 is not easily shifted with respect to the negative foil workpiece 12 due to vibration or the like.

  The positive foil strip 13 and the negative foil strip 12 on the downstream side of the laminating roll 5 are in a state in which the positive foil strip 13 is disposed on the negative foil fabric 12 with an interval in the longitudinal direction. The cathode foil strip 13 and the anode foil fabric 12 in such a state travel from the bonding roll 5 to the anode fabric cutting mechanism 6. The negative electrode foil fabric 12 that has reached the negative electrode fabric cutting mechanism 6 is cut in the width direction. The negative electrode fabric cut-off mechanism 6 cuts a portion of the negative electrode foil fabric 12 without the positive foil strip 13.

  In this way, the electrode foil pair strip 14 is obtained. Since the electrode foil pair strips 14 are obtained one after another as the negative electrode foil fabric 12 proceeds, a large number of electrode foil pair strips 14 are stacked on the pedestal 7. The electrode foil pair strips 14 stacked on the base 7 are pressed in the thickness direction by the press roll 8. More specifically, each time a new electrode foil pair strip 14 is placed on the pedestal 7, pressing by the press roll 8 is performed. As a result, the newly supplied electrode foil pair strip 14 is integrated with the electrode foil pair strip 14 previously supplied and already stacked on the pedestal 7. It depends on the adhesiveness of the separator layer.

  In this way, when a predetermined number of electrode foil pair strips 14 are laminated on the base 7 and integrated by the press roll 8, an electrode laminate 15 is obtained. The electrode laminate 15 functions as a power generation element in the battery. The electrode laminate 15 is usually stored together with the electrolyte in the battery container.

  Here, the bonding roll 5 will be described in more detail. The bonding roll 5 is a part of the press roll apparatus 18 shown in FIG. The press roll device 18 of FIG. 2 has a lower roll 17 in addition to the bonding roll 5. A negative electrode foil fabric 12 is passed between the bonding roll 5 and the lower roll 17. Although omitted in FIG. 2, the positive foil strips 13 are actually arranged on the negative foil fabric 12 with a gap. The negative electrode foil fabric 12 and the positive foil strip 13 are lightly pressed in the thickness direction by the laminating roll 5 and the lower roll 17 when passing through the press roll device 18. That is, the bonding roll 5 and the lower roll 17 form a press roll pair.

  The shaft 19 of the bonding roll 5 and the shaft 20 of the lower roll 17 are held by a bearing member 21. The shaft 20 of the lower roll 17 is connected to a rotational drive source 22. A lever bar 23 is attached to the shaft 19 of the bonding roll 5. The lever bar 23 is fixed to the shaft 19. Further, the press roll device 18 is provided with a spring 24 and a stopper 25. The spring 24 presses the lever bar 23. The stopper 25 regulates the movement of the lever bar 23 due to the spring 24 being pressed.

  The laminating roll 5 includes a sleeve member 26 and an eccentric member 27. The sleeve member 26 is a cylindrical member, and is in contact with the negative electrode foil fabric 12 and the positive foil strip 13 on the outer surface, and rotates with the progress of the negative electrode foil fabric 12. The eccentric member 27 is located inside the sleeve member 26. However, the eccentric member 27 does not rotate with the rotation of the sleeve member 26. The outer surface of the eccentric member 27 and the inner surface of the sleeve member 26 are in contact with each other without a gap. Thereby, the sleeve member 26 can slide and rotate with respect to the eccentric member 27 without rattling. The eccentric member 27, the shaft 19, and the lever bar 23 are integrated with each other.

  The bonding roll 5 will be further described with reference to FIG. In FIG. 3, the front view of the press roll device 18 is shown with the bearing member 21 omitted. As shown in FIG. 3, the lever bar 23 is formed so as to protrude from the eccentric member 27 toward the upstream side in the conveying direction of the negative foil workpiece 12. That is, the lever bar 23 is formed to extend outward in the radial direction of the bonding roll 5. In the bonding roll 5 shown in FIG. 3, the position of the shaft 19 is a fixed position. This is because the shaft 19 is held by the bearing member 21. Therefore, the eccentric member 27 of the laminating roll 5 can be rotated, that is, oscillated slightly around the shaft 19. For this reason, the eccentric member 27 can be slightly displaced in the height direction. Due to the displacement of the height of the eccentric member 27, the laminating roll 5 including the sleeve member 26 is displaced in the height direction. In FIG. 3, the degree of eccentricity of the shaft 19 in the eccentric member 27 is drawn more emphasized than in the case of FIG.

  The elastic force F of the spring 24 is applied to the lever bar 23 that is integral with the eccentric member 27. Thereby, the bonding roll 5 is pressed toward the negative electrode foil fabric 12 and the positive foil strip 13 (arrow G). However, the pushing up of the lever bar 23 by the elasticity F is regulated by the stopper 25. For this reason, the pressing of the laminating roll 5 on the negative electrode foil fabric 12 and the positive foil strip 13 is also restricted.

  Specifically, the restricting position of the stopper 25 is adjusted so that the position of the laminating roll 5 in a state where the lever bar 23 and the stopper 25 are in contact with each other satisfies the following two conditions. The first condition is that the positive foil strip 13 is properly pressed against the negative foil fabric 12. For this purpose, the gap between the bonding roll 5 and the lower roll 17 should not be too large. The second condition is that the impact on the shoulder of the positive foil strip 13 is not excessive. To that end, the gap should not be too small. If the gap is too small, as shown in FIG. 4, the impact of the laminating roll 5 is applied to the shoulder of the positive foil strip 13 that is conveyed together with the negative foil fabric 12. Depending on the degree of impact, the positive foil strip 13 may be damaged. Further, although depending on the relationship between the interval between the positive foil strips 13 and the diameter of the bonding roll 5, the bonding roll 5 may come into contact with the negative electrode foil fabric 12 without the positive foil strip 13. When this contact occurs, the negative electrode foil fabric 12 may be stressed and may be broken.

  And since the thickness of the positive foil strip 13 is usually only less than 0.5 mm, the range in which both the first condition and the second condition are satisfied is extremely narrow. For this reason, it is not easy to directly position the bonding roll 5 to satisfy the condition. However, in this embodiment, as shown in FIGS. 2 and 3, the height position of the bonding roll 5 is positioned by the stopper 25 via the lever bar 23. In this embodiment, the lever position of the lever bar 23 allows the height position of the bonding roll 5 to be easily positioned within an appropriate range.

  The lever ratio of the lever bar 23 is the ratio between the distance L1 and the distance L2 shown in FIG. The distance L <b> 1 is a distance between the axial center position of the shaft 19 and the axial center position of the laminating roll 5 with respect to the conveyance direction of the negative electrode foil fabric 12. That is, the offset amount between the press position and the oscillation center axis position in the bonding roll 5. The distance L <b> 2 is a distance between the axial center position of the shaft 19 and the position where the stopper 23 hits the bar 23. In this embodiment, the distance L2 is set to be longer than the distance L1. For this reason, when the restriction position of the lever bar 23 is adjusted by the stopper 25, the adjustment amount is reduced by the lever ratio and appears as the adjustment amount of the height position of the bonding roll 5. Therefore, by adjusting the position of the stopper 25, the height position of the laminating roll 5 can be easily adjusted so as to satisfy the above-described conditions.

  In this embodiment, as shown in FIG. 2, the stopper 25 is configured as a cam. Therefore, the restriction position of the lever bar 23 by the stopper 25 can be adjusted by attaching an appropriate operation lever to the stopper 25 and rotating the stopper 25. Once this adjustment is made, there is little need for subsequent readjustment. Therefore, after this adjustment, the stopper 25 may be fixed so that it cannot be readjusted.

  In the state where the height position of the laminating roll 5 is appropriately adjusted in this way, as shown in FIG. 5, even if the negative foil foil 12 and the positive foil strip 13 are passed through, almost no impact is applied to the positive foil strip 13. . For this reason, the favorable electrode foil pair strip 14 is obtained. In the situation shown in FIG. 5, the height difference T1 of the laminating roll 5 between the place where the positive foil strip 13 is present and the place where the positive foil strip 13 is not present is very small. For this reason, the impact applied to the shoulder of the positive foil strip 13 is negligible. Further, the bonding roll 5 does not come into contact with the negative electrode foil fabric 12. The height difference T1 (crushing allowance) is about 1/10 of the thickness T2 of the positive foil strip 13 (strictly speaking, the thickness obtained by subtracting the crushing allowance T1) is 0.3 mm, for example. It is about 03 mm.

  In FIG. 5, the height of the laminating roll 5 where the positive foil strip 13 is not present is lower than the height where the positive foil strip 13 is present by the crushing margin T1. This lowering height is the height regulated by the stopper 25. Therefore, at this time, the elastic force of the spring 24 is received by the stopper 25, and therefore does not act as a pressing force of the bonding roll 5. On the other hand, where the positive foil strip 13 is present, the bonding roll 5 is slightly lifted. In this state, the spring 24 is slightly compressed by the lever bar 23 as shown in FIG. For this reason, the elasticity of the spring 24 acts as the pressing force G of the bonding roll 5. Thereby, the positive foil strip 13 is crimped to the negative foil fabric 12. Although the crushing margin T1 is very small as described above, the vertical width T3 of the lever bar 23 at that time is larger due to the effect of the lever ratio described above. Since a lever ratio of about 1: 100 can be easily achieved, a margin for adjusting the position of the stopper 25 can be about several millimeters, and the stopper 25 of the cam mechanism can be easily adjusted.

  The elasticity of the spring 24 does not have to be so strong as compared to the pressing force G required for this pressure bonding. This is due to the effect of the lever ratio described above. If the lever ratio is set to about 1: 100, even if the pressing force G needs to be about 4.9 [kN], for example, it is sufficient if the elasticity of the spring 24 is about 49 [N]. However, strictly speaking, the distance L2 when considering this is the distance between the axial center position of the shaft 19 and the position where the elasticity of the spring 24 acts on the lever bar 23.

  As described in detail above, according to the present embodiment, in the press roll device 18 that presses the positive foil strip 13 that is intermittently arranged on the negative foil fabric 12, the eccentric member 27 is attached to the laminating roll 5. By providing the lever bar 23, the fine height adjustment of the bonding roll 5 is performed as the restriction position adjustment of the stopper 25 enlarged by the lever ratio. Thereby, the press roll apparatus 18 for battery manufacture which can be pressed by applying moderate pressing force without damaging the positive foil strip 13 is realized.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, in this embodiment, the negative electrode foil is supplied in the form of a fabric and the positive electrode foil is supplied in a strip shape to the bonding roll 5. However, this may be reversed. In this embodiment, the lever bar 23 is provided so as to protrude to the upstream side in the conveying direction of the negative foil workpiece 12 with respect to the bonding roll 5. However, this is not essential, and the lever bar 23 may be provided in any direction protruding outward in the radial direction of the bonding roll 5.

  Further, instead of offsetting the shaft 19 that is the swing center of the laminating roll 5 to the upstream side with respect to the press position, it may be offset to the downstream side. Further, instead of using an elastic force generating member that tries to expand like the spring 24, a member that generates an elastic force in the direction to reduce can also be used. In short, what is necessary is just to be comprised so that it may act as the pressing force G to the positive electrode foil strip 13 in the bonding roll 5. FIG.

DESCRIPTION OF SYMBOLS 1 Stacked battery manufacturing apparatus 2 Positive electrode fabric supply part 3 Negative electrode fabric supply part 4 Positive electrode fabric cutting mechanism 5 Bonding roll (1st roll)
6 Negative electrode fabric cut mechanism 7 Base 8 Press roll 12 Negative foil fabric 13 Positive foil strip 14 Electrode foil pair strip 15 Electrode laminate 18 Press roll device 19 Shaft 23 Lever bar 24 Spring 25 Stopper 26 Sleeve member 27 Eccentric member

Claims (1)

Laminate the first electrode foil strips and the second electrode foil strips to be an electrode laminate so that a plurality of the second electrode foil strips are arranged on the first electrode foil fabrics at intervals in the longitudinal direction. A press roll device for manufacturing a battery,
Having a pair of press rolls for pressing the first electrode foil fabric and the second electrode foil strip placed thereon in the thickness direction;
The first roll located on the second electrode foil strip side in the press roll pair,
A cylindrical sleeve member that rotates with the progress of the first electrode foil fabric;
Positioned in the sleeve member, does not rotate with the progress of the first electrode foil fabric, and is centered on a position offset in the traveling direction of the first electrode foil fabric with respect to the press position of the press roll pair. An eccentric member that swings together with the sleeve member,
further,
A lever bar formed to extend outward in the radial direction of the first roll, and swinging with swinging of the eccentric member;
A pressing force generator for generating a pressing force to the lever bar in a direction in which the first roll is pressed against the first electrode foil fabric and the second electrode foil strip;
A stopper member for restricting swinging of the lever bar due to the pressing force of the pressing force generating portion,
The lever length from the position of the swinging central axis of the eccentric member to the position where the lever bar is restricted by the stopper member is:
A press roll device for manufacturing a battery, wherein the press roll device is larger than an offset amount between the press position and the swing center axis position with respect to a traveling direction of the first electrode foil fabric.

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