JP6702131B2 - Stacked battery manufacturing equipment - Google Patents

Description

  The present invention relates to a laminated battery manufacturing apparatus for manufacturing a laminated battery having a structure in which first electrodes and second electrodes, which are strip-shaped foils, are alternately laminated.

  2. Description of the Related Art Conventionally, as a secondary battery or other battery, one having a built-in electrode laminate in which first electrodes and second electrodes are alternately stacked is used. In such an electrode laminated body, there is a structure in which strip-shaped foils are used as both the first electrode and the second electrode and these are laminated in a flat stack.

  As a prior art for manufacturing an electrode laminate having such a laminated structure, there is an apparatus described in Patent Document 1. In the device of the same document, the strip-shaped lithium foil 18 is attached to the surface of the "electrode plate 12" in the longitudinal direction while being conveyed in the longitudinal direction. Here, the "strip-shaped lithium foil 18" is originally supplied as a counter-shaped "lithium foil 18a". Then, "perforations" can be inserted in the width direction during transportation. Further, the "transfer roller" that attaches the "lithium foil 18a" to the "electrode plate 12" is rotated intermittently, so that the "lithium foil 18a" is supplied as "the strip-shaped lithium foil 18" on the "electrode plate 12". ([0012] to [0019] of the same document, FIG. 1). In this manner, the "polar plate 12" to which the "rectangular lithium foil 18" is attached at intervals is subsequently cut and further laminated to obtain a flat laminated structure.

JP, 10-233209, A

  However, the above-mentioned conventional technique has the following problems. That is, the "lithium foil 18a" does not always become a "rectangular lithium foil 18" having a clean shape on the "electrode plate 12". The reason is that the final cutting of the "lithium foil 18a" is performed by tearing due to the speed difference between the "electrode plate 12" and the "lithium foil 18a". This speed difference itself is indispensable for intermittently supplying the "lithium foil 18a" onto the "pole plate 12" in the form of a piece. On the other hand, if the “strip-shaped lithium foil 18” is completely separated from the “lithium foil 18a” and then the attachment to the “electrode plate 12” is started, the “strip-shaped lithium foil 18” on the “electrode plate 12” may be formed. The positional accuracy of the lithium foil 18" cannot be secured. Therefore, it is difficult to supply and stack the strip-shaped second electrode foil (corresponding to the "strip-shaped lithium foil 18") on the first electrode foil (corresponding to the "polar plate 12") in a cloth shape with high positional accuracy. It was difficult.

  The present invention has been made to solve the above-mentioned problems of the conventional technique. That is, the problem is to provide a laminated battery manufacturing apparatus capable of manufacturing a laminated battery having almost no misalignment by stacking second electrode foil strips on a piece of cloth-shaped first electrode foil with high positional accuracy. To do.

  A laminated battery manufacturing apparatus according to an aspect of the present invention is an apparatus for manufacturing a laminated battery having a structure in which a first electrode foil strip and a second electrode foil strip are stacked, and a first electrode foil strip is provided in a longitudinal direction thereof. The first electrode foil supply unit, which is supplied at the first speed, and the second electrode foil piece are conveyed in the longitudinal direction of the first electrode foil piece at the second speed, which is slower than the first speed, and are advanced at the first speed. The second electrode foil supply part to be supplied onto the first electrode foil piece and the second electrode foil piece are cut at a position upstream from the confluence position with the first electrode piece piece, and downstream from the cutting position. A second electrode foil cutting mechanism whose part is a second electrode foil strip, a laminating roll that presses and bonds the first electrode foil piece and the second electrode foil strip on the first electrode foil strip in the thickness direction, and a second electrode foil The first electrode foil strip and the second electrode foil strip are separated by cutting the portion of the first electrode foil strip with no strips of the second electrode foil strip in the width direction at a position downstream from the bonding roll. A first electrode foil cutting mechanism, which is an electrode foil pair strip laminated one by one, and a second electrode foil strip after joining with the first electrode foil piece is allowed to proceed at a speed faster than the second speed. And a differential speed mechanism.

  In the laminated battery manufacturing apparatus according to the above aspect, the first speed, which is the conveying speed of the first electrode foil piece, and the second speed, which is the conveying rate of the second electrode foil piece, are different, and the first speed is faster. Further, the second electrode foil piece is cut by the second electrode foil cutting mechanism to form a second electrode foil strip. Therefore, the second electrode foil strips are arranged on the first electrode foil piece with a space therebetween while being positioned. Here, the strip of the second electrode foil after being joined with the piece of the first electrode foil piece is dragged at the fast first speed, which is allowed by the differential speed mechanism. Therefore, even when the strip of the second electrode foil is being dragged at the first speed, extra stress is not applied to the second electrode foil piece on the upstream side or the second electrode foil supply section. After that, cutting is performed by the first electrode foil cutting mechanism to obtain an electrode foil pair strip. A battery is obtained by stacking the strips of electrode foil pairs.

  According to this configuration, a laminated battery manufacturing apparatus is provided which can laminate a second electrode foil strip on a piece of cloth-shaped first electrode foil with high positional accuracy to produce a laminated battery with almost no misalignment in position. There is.

It is a schematic diagram which shows the structure of the laminated battery manufacturing apparatus which concerns on embodiment. FIG. 2 is a perspective view showing a peripheral portion of a laminating roll and a positive electrode piece cutting mechanism of the laminated battery manufacturing apparatus of FIG. 1. It is a front view of the part shown in FIG.

  Hereinafter, embodiments embodying the present invention will be described in detail with reference to the accompanying drawings. This embodiment embodies the present invention as a laminated battery manufacturing apparatus 1 shown in FIG.

  The laminated battery manufacturing apparatus 1 of FIG. 1 includes a positive electrode piece material supply unit 2, a negative electrode piece material supply unit 3, a positive piece piece material cutting mechanism 4, a bonding roll 5, a negative piece piece material cutting mechanism 6, a pedestal 7, and a press roll. 8 and. A positive electrode foil piece product coil 9 is attached to the positive electrode piece piece product supply unit 2 so that the positive electrode piece piece 10 is unwound. A negative electrode foil piece product coil 11 is attached to the negative electrode piece piece product supply unit 3 so that the negative electrode piece piece 12 is unwound. Both the positive electrode foil waste material 10 and the negative electrode foil waste material 12 are long foil-shaped 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 piece 12. Both the positive electrode foil web 10 and the negative electrode foil web 12 travel in the longitudinal direction toward the laminating roll 5.

  The positive electrode piece cutting mechanism 4 cuts the positive electrode piece piece 10 in the width direction to form a card-shaped piece 13 of positive electrode foil. The bonding roll 5 bonds the negative electrode foil piece 12 and the positive electrode foil strip 13 together. For this reason, the negative electrode foil piece 12 is cut and the positive electrode piece 10 is cut into the positive electrode strip 13 and then supplied to the laminating roll 5. The positive electrode foil strips 13 are further supplied to the bonding roll 5 at intervals in the longitudinal direction of the negative electrode foil piece 12.

  The negative-electrode piece cloth cutting mechanism 6 cuts the negative-electrode piece cloth 12 in the width direction. By this cutting, the electrode foil pair strip 14 in which the positive electrode foil strip 13 and the negative electrode foil strip 1 are laminated one by one is obtained. The pedestal 7 is for placing the obtained strip 14 of electrode foil. The press roll 8 presses the strips 14 of electrode foil pairs laminated on the pedestal 7 in the thickness direction. A nip roll 16 that supports the negative electrode foil piece 12 and the positive electrode foil strip 13 is provided immediately upstream of the negative piece piece 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 electrode foil piece 12 and the positive electrode foil strip 13 are supplied to the bonding roll 5. As described above, the negative electrode foil piece material 12 is supplied from the negative electrode piece material supply part 3 and reaches the bonding roll 5 by proceeding in the longitudinal direction. The positive electrode foil strip 13 is supplied to the laminating roll 5 by the positive electrode piece material supply unit 2 and the positive piece piece cutting mechanism 4. The positive electrode foil strips 13 are arranged on the negative electrode foil piece 12 by the laminating roll 5 at intervals in the longitudinal direction.

  Then, the positive electrode foil strip 13 and the negative electrode foil piece 12 are lightly pressed in the thickness direction by the laminating roll 5. In this state, the positive electrode foil strip 13 is lightly adhered to the negative electrode foil piece 12. This is because the separator layer of the negative electrode foil piece 12 has some adhesiveness. Therefore, thereafter, the position of the positive electrode foil strip 13 is not easily displaced from the negative electrode foil piece 12 due to vibration or the like.

  The positive electrode foil strips 13 and the negative electrode foil strips 12 on the downstream side of the laminating roll 5 are in a state in which the positive electrode strip strips 13 are arranged on the negative electrode foil strip 12 at intervals in the longitudinal direction. The positive electrode foil strip 13 and the negative electrode foil piece 12 in such a state move from the laminating roll 5 to the negative piece piece cutting mechanism 6. The negative electrode foil piece 12 that has reached the negative piece piece cutting mechanism 6 is cut in the width direction. The negative piece cloth cutting mechanism 6 cuts a portion of the negative piece foil 12 which does not have the positive foil strip 13.

  Thus, the strip 14 of electrode foil pair is obtained. Since the electrode foil pair strips 14 are successively obtained as the negative electrode foil piece 12 advances, a large number of electrode foil pair strips 14 are stacked on the pedestal 7. The strip of electrode foil pair 14 laminated on the pedestal 7 is pressed in the thickness direction by the press roll 8. More specifically, each time one strip of electrode foil pair 14 is newly placed on the pedestal 7, pressing by the press roll 8 is performed. As a result, the newly supplied strips of electrode foil pair 14 are integrated with the strips of electrode foil pair 14 that have been previously supplied and already stacked on the pedestal 7. It depends on the adhesiveness of the separator layer described above.

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

  Here, the joining of the positive electrode foil strip 13 and the negative electrode foil piece 12 at the position of the laminating roll 5 will be described in more detail with reference to FIGS. 2 and 3. As shown in FIGS. 2 and 3, a bonding roll 17 is provided below the bonding roll 5. The laminating roll 5 and the laminating roll 17 form a roll pair, and the negative electrode foil piece 12 and the positive electrode foil strip 13 thereon are pressed in the thickness direction.

  2 and 3, an upstream conveying roll 18 on the upstream side of the positive piece fabric cutting mechanism 4 and a downstream conveying roll 19 on the downstream side are further provided. Nip rolls 20 and 21 are provided above the upstream transport roll 18 and the downstream transport roll 19, respectively. The upstream transport roll 18 and the downstream transport roll 19 are connected to a drive motor 22 as shown in FIG. However, a one-way clutch 23 is interposed between the downstream transport roll 19 and the drive motor 22. The one-way clutch 23 allows the downstream transport roll 19 to rotate at a rotation speed faster than the rotation speed driven by the drive motor 22.

The laminated battery manufacturing apparatus 1 configured as described above operates as follows. First, the negative electrode foil piece 12 is conveyed in the longitudinal direction at a constant speed (speed V1). On the other hand, the positive electrode foil piece 10 is conveyed at a speed V2 lower than the speed V1. The transport directions are the same at the confluence. The difference in speed between the negative electrode foil waste material 12 and the positive electrode foil waste material 10 is because a gap S is formed between the positive electrode foil strips 13 on the negative electrode foil waste material 12 after the bonding. As shown in FIG. 3, where the size of the positive electrode strip 13 in the transport direction is M and the arrangement pitch is P, the speed V2 is given by the following equation.
V2 = V1* (M/P)

  The positive electrode foil waste material 10 supplied from the positive electrode waste material supply unit 2 is transported through the positive electrode waste material cutting mechanism 4 by the upstream transport roll 18 and the downstream transport roll 19. The positive electrode foil piece 10 is cut by the positive piece piece cutting mechanism 4 just before the tip of the positive electrode piece 10 reaches the bonding rolls 5 and 17. Then, the cut tip portion of the positive electrode foil piece 10 becomes the positive electrode foil strip 13. Although the positive electrode foil strip 13 has been separated from the positive electrode foil piece 10, it is already in a state of being driven by the downstream transport roll 19. Therefore, it proceeds at the speed V2 as before cutting. Of course, the positive electrode foil strip 13 at this time is in a state of being positioned by the downstream transport roll 19 and the nip roll 21.

  Immediately after that, the tip of the positive electrode foil strip 13 enters between the bonding rolls 5 and 17 together with the negative electrode foil piece 12. Then, the positive electrode foil strip 13 is pulled at a speed V1 higher than the speed V2. On the other hand, the downstream transport roll 19 can rotate at a high rotation speed corresponding to the speed V1. This is because the downstream transport roll 19 is provided with the one-way clutch 23 as described above. Therefore, the positive electrode foil strip 13 is conveyed at the speed V1 while being pressed by the laminating rolls 5 and 17 together with the negative electrode foil piece 12 without being subjected to any particular tensile stress.

  On the other hand, the portion of the positive electrode foil piece 10 upstream of the cut portion continues to proceed at the speed V2 as it is. This is because the dragging at the speed V1 acts only on the positive electrode foil strip 13 and does not act on the positive electrode foil strip 10 on the upstream side of the cut portion. In addition, due to the action of the one-way clutch 23, the rotational speeds of the drive motor 22 and the upstream transport roll 18 are not affected by the dragging at the speed V1. The gap S is formed due to the speed difference between the positive electrode foil strip 13 and the positive electrode foil strip 10.

  Then, when the rear end of the positive electrode foil strip 13 comes out of the downstream transport roll 19, the rotational speed of the downstream transport roll 19 returns to the slow rotational speed corresponding to the original speed V2. After that, the tip of the new positive electrode foil piece 10 formed by cutting reaches the downstream transport roll 19. After that, the same processing as above is repeated. In this way, on the downstream side of the bonding rolls 5 and 17, the positive electrode foil strips 13 are arranged on the negative electrode foil piece 12 with a high positional accuracy. After that, as described above, the negative piece fabric cutting mechanism 6 cuts and stacks on the pedestal 7, whereby a stacked battery with almost no misalignment of positions is manufactured.

  As described above in detail, in the laminated battery manufacturing apparatus 1 according to the present embodiment, the leading end portion of the positive electrode foil strip 10 is cut and supplied as the positive electrode foil strip 13 onto the negative electrode foil strip 12 at the transport speed V2. Here, a one-way clutch 23 is provided on the downstream transport roll 19 that transports the positive electrode foil strip 13 at a position downstream of the cut position. This allows the strip of the positive electrode foil 13 to be pulled at a high transport speed V1 of the negative electrode foil piece 12. Thereby, the positive electrode foil strips 13 can be supplied on the negative electrode foil piece 12 in a properly positioned state with a space therebetween, and the negative electrode foil piece 12 is not subjected to extra stress. Has been realized.

  The present embodiment is merely an example and does not limit the present invention. Therefore, naturally, the present invention can be variously improved and modified without departing from the scope of the invention. For example, in this embodiment, the upstream transport roll 18 and the downstream transport roll 19 are basically driven by the same drive source (drive motor 22), and the one-way clutch 23 allows the downstream transport roll 19 to rotate at a higher rotational speed. The rotation is allowed. However, this is not the only means for allowing the downstream transport roll 19 to rotate at a higher rotation speed. It is also possible to obtain the same effect by driving the upstream transport roll 18 and the downstream transport roll 19 with different motors. In that case, the motor for driving the downstream transport roll 19 may be controlled so as to periodically repeat low speed rotation (transport speed V2) and high speed rotation (transport speed V1).

DESCRIPTION OF SYMBOLS 1 Laminated battery manufacturing device 2 Positive electrode piece supply section 3 Negative piece supply section 4 Positive piece piece cutting mechanism 5 Laminating roll 6 Negative piece piece cutting mechanism 7 Pedestal 8 Press roll 12 Negative foil piece 13 Positive foil strip 14 Electrode foil pair strip 15 Electrode stack Body 17 Laminating roll 18 Upstream transport roll 19 Downstream transport roll 22 Drive motor 23 One-way clutch

Claims (1)

A laminated battery manufacturing apparatus for manufacturing a laminated battery having a structure in which a first electrode foil strip and a second electrode foil strip are stacked,
A first electrode foil supply unit for supplying the first electrode foil piece in the longitudinal direction at a first speed;
The second electrode foil piece is conveyed in the longitudinal direction of the first electrode piece piece at a second speed lower than the first speed, and is transferred onto the first electrode foil piece moving at the first speed. A second electrode foil supply unit for supplying,
A second electrode foil cutting mechanism which cuts the second electrode foil piece at a position upstream from a confluence position with the first electrode foil piece and makes a portion downstream of the cutting position the second electrode foil strip;
A laminating roll which presses the first electrode foil piece and the second electrode foil strip on the first electrode foil piece in the thickness direction to attach the same.
The first electrode foil is obtained by cutting a portion of the piece of the first electrode foil piece on which the second electrode foil strips are laminated without the second electrode foil strips in a width direction at a position downstream of the bonding roll. A first electrode foil cutting mechanism, which is an electrode foil pair strip in which a strip and the second electrode foil strip are laminated one by one,
A laminated battery manufacturing apparatus comprising: a differential speed mechanism that allows the second electrode foil strip after joining with the first electrode foil piece to proceed at a speed faster than the second speed.

Images