JP6760193B2 - Electrode laminate manufacturing equipment - Google Patents

Description

The present invention relates to an apparatus for manufacturing an electrode laminate used as a power generation element of a battery. More specifically, the present invention relates to an electrode laminate manufacturing apparatus that manufactures an electrode laminate having a structure in which both strip-shaped electrode plates are stacked flat, which is not a winding type.

In lithium-ion batteries and other batteries, an electrode laminate formed by laminating positive and negative electrode plates is used as a power generation element. Although there is a wound type electrode laminate, the flat stacking type has been attracting attention from the viewpoint of increasing the density. As an example of a manufacturing technique for manufacturing a flat stack type electrode laminate, the one described in Patent Document 1 can be mentioned. In the technique of the same document, an adhesive layer is formed on the "laminated surface of the positive electrode layer and the negative electrode layer" or the "laminated surface of the separator", and then these "positive electrode layer", "negative electrode layer", and "separator" are laminated. It is supposed to be. After that, the adhesive layer is cured and the laminated body is cut.

Japanese Unexamined Patent Publication No. 2011-034903

However, the above-mentioned conventional technique has the following problems. First, it is not possible to guarantee the prevention of short circuits between the positive and negative electrodes in the laminated body after cutting. This is because the "positive electrode layer" and the "negative electrode layer" are cut at the same location. Further, the "positive electrode layer", the "negative electrode layer" or the "separator" having the adhesive layer formed on the laminated surface must be dried once before being subjected to the laminating step for subsequent handling ([0038] of the same document. ]). After that, it is necessary to use a hot-melt adhesive as the adhesive in order to exert an adhesive action. For this reason, the equipment for the drying process is complicated, and there are restrictions on the adhesives that can be used.

The present invention has been made to solve the problems of the above-mentioned conventional techniques. That is, the problem is to provide an electrode laminate manufacturing apparatus capable of manufacturing an electrode laminate having a simple structure without a possibility of causing a short circuit between positive and negative electrodes.

The apparatus for manufacturing an electrode laminate according to one aspect of the present invention is an apparatus for producing an electrode laminate in which a first electrode plate and a second electrode plate are laminated via a separator, and is an apparatus for producing a second electrode strip. A leather-covered cloth sending part that sends out a leather-covered cloth that is covered with a separator on both sides, and a mounting part that places a strip of first electrode plate on one side of the leather-covered cloth at intervals to obtain an integrated cloth. ， By rotating around the axis, the coating roll that applies adhesive to the back surface, which is the opposite side of the first electrode strip of the integrated cloth, and the integrated cloth that has been coated with adhesive The coating roll has a cutting portion that cuts the strips of the first pole plate at intervals between the strips to form an integrated strip, and a laminated portion that stacks the strips of the integrated strips. A coating area where the adhesive is applied to the area corresponding to the strips, and a concave non-coating area where the adhesive is not applied to the area corresponding to the space between the first electrode strips on the back surface. And have.

In the apparatus for manufacturing the electrode laminate in the above aspect, the leather covering cloth is sent out from the leather covering cloth sending section, and the first electrode strip is placed on the leather covering cloth strip at the mounting section to form an integrated cloth. However, there is a gap between the first pole plate strips. Then, the adhesive is applied to the back surface of the place where the first electrode strip is located by the coating roll. At the cutting portion, the positions of the intervals between the first plate strips are cut. In the integrated strip obtained in this way, since the end portion of the first electrode plate and the end portion of the second electrode plate are located apart from each other, a short circuit is unlikely to occur. In addition, since it is not necessary to dry the applied adhesive once, the device configuration is simple.

According to this configuration, there is provided an electrode laminate manufacturing apparatus capable of manufacturing an electrode laminate with a simple configuration that does not cause a short circuit between positive and negative electrodes.

It is a front view which shows the structure of the manufacturing apparatus which concerns on embodiment. It is a front view which shows the structure of the mounting part. It is a front view which shows the structure of a coating part, a cutting machine, and a laminated part. It is a schematic diagram which shows the flow of each cloth in the manufacturing of the electrode laminated body in an embodiment.

Hereinafter, embodiments embodying the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, the present invention is applied to the electrode laminate manufacturing apparatus 1 shown in FIG. The manufacturing apparatus 1 of FIG. 1 has a leather covering material delivery unit 2, a mounting unit 3, a coating unit 4, a cutting machine 5, and a laminating unit 6.

The skin-covered cloth delivery unit 2 is a portion that sends the skin-covered cloth 7 toward the mounting portion 3. The skin-covered cloth delivery section 2 is provided with a negative electrode plate cloth supply section 8, two separator cloth supply sections 9, and a bonding section 10. An adhesive coating roll 11 is provided on the upstream side of the bonding portion 10. The adhesive coating roll 11 applies an adhesive to the surface of the separator cloth 12 on the negative electrode plate cloth 13 side. As a result, the leather covering cloth 7 formed by covering both sides of the negative electrode plate cloth 13 with the separator cloth 12 is sent from the bonding portion 10. The leather covering material delivery unit 2 is further provided with a leveler 14, a transport roll 15, and a buffer mechanism 16. As a result, the skin-covered cloth delivery unit 2 sends the skin-covered cloth 7 toward the mounting portion 3.

The mounting portion 3 is a portion where the positive electrode plate strip 17 is placed on the leather covering cloth 7 to obtain the integrated cloth 18. For this reason, the manufacturing apparatus 1 is provided with a positive electrode plate cloth supply unit 19, a leveler 20, a transport roll 21, and a buffer mechanism 22. As a result, the positive electrode plate cloth 23 is supplied to the mounting portion 3. However, the supply speed of the positive electrode plate cloth 23 to the mounting portion 3 is slightly slower than the supply speed of the skin covering cloth 7.

The mounting portion 3 will be further described with reference to FIG. As shown in FIG. 2, the mounting portion 3 is provided with a cutting machine 24, an adhesive coating roll 25, and a press roll 26. The cutting machine 24 cuts the positive electrode plate piece 23 into a positive electrode plate strip 17. The adhesive application roll 25 applies an adhesive to the surface of the positive electrode plate strip 17 on the skin covering material 7 side. The press roll 26 is formed by placing a positive electrode plate strip 17 on the leather covering cloth 7 and pressing the strips 17 to form an integrated cloth 18.

The transport speed of the integrated cloth 18 by the press roll 26 is the same as the supply speed of the leather cover cloth 7. Therefore, when the leading positive electrode plate strip 17 enters the press roll 26, the positive electrode plate strip 17 is pulled at a higher speed than the subsequent positive electrode plate strip 17. As a result, a space 27 is provided between the positive electrode plate strips 17 on the leather covering cloth 7 in the integrated cloth 18.

In FIG. 1, on the downstream side of the mounting portion 3, the coating portion 4, the cutting machine 5, and the laminating portion 6 are located. These will be described with reference to FIG.

The coating unit 4 has a coating roll 28. The coating roll 28 coats the adhesive on the surface of the integrated cloth 18 opposite to the positive electrode plate strip 17, that is, the surface on the skin covering cloth 7 side by rotating around the axis. The coating roll 28 has a recess 29 formed in a part of a side surface of the cylindrical shape. No coating is performed on the recess 29. The portion of the cylindrical side surface of the coating roll 28 other than the recess 29 is the coating region 30.

In the coating roll 28, the length of the coated portion of the integrated cloth 18 by the coating region 30 matches the length of the positive electrode plate strip 17 in the transport direction, and the length of the non-coated portion by the recess 29 is the interval 27. It is designed to match the length. Regarding the rotation of the coating roll 28, the coating region 30 faces the back surface of the integrated cloth 18 at the position where the positive electrode plate strip 17 is placed, and the recess 29 faces the back surface of the interval 27 portion. As such, speed control and phase control are performed.

The cutting machine 5 is located on the downstream side of the coating unit 4, and cuts the integrated cloth 18 into an integrated strip 31. The cutting of the integrated piece 18 by the cutting machine 5 is performed on a portion of the integrated piece 18 within the range of the interval 27. That is, the cutting machine 5 cuts only the leather covering cloth 7, and the positive electrode plate strip 17 is not the object to be cut by the cutting machine 5. This means that the adhesive coated by the coating roll 28 does not exist at the portion of the integrated cloth 18 that is cut by the cutting machine 5. Therefore, the adhesive does not adhere to the cutting machine 5 and the cutting performance of the cutting machine 5 is not impaired.

Further, in the integrated strip 31 after cutting, the positive electrode plate strip 17 is located at the central portion with respect to the transport direction, and only the separator and the negative electrode plate are present at the front end and the rear end. Of course, the separator is derived from the separator cloth 12, and the negative electrode plate is derived from the negative electrode plate cloth 13. Therefore, the ends of the negative electrode plate are present at both ends of the integrated strip 31 in the transport direction, but the ends of the positive electrode plate are not present. The ends of the positive electrode plate are not at both ends of the integrated strip 31, but are slightly inside in the transport direction. Therefore, there is a distance far larger than the thickness of the separator between the end of the negative electrode plate and the end of the positive electrode plate. Therefore, in the integrated strip 31, a short circuit between the positive and negative plates is unlikely to occur.

The laminating portion 6 has a laminating base 32 and a laminating roll 33. In the laminating portion 6, the integrated strips 31 cut by the cutting machine 5 are laminated on the laminating table 32. Further, the integrated strip 31 newly laminated on the stacking table 32 is bonded to the existing integrated strip 31 by the bonding roll 33. In this way, the electrode laminate 34 is obtained. In the electrode laminate 34 shown in FIG. 1, a positive electrode plate and a negative electrode plate are laminated via a separator. Further, for the same reason as described above for the integrated strip 31, a short circuit between the positive and negative electrode plates is unlikely to occur in the electrode laminate 34 as well.

The manufacturing apparatus 1 configured as described above operates as follows. That is, the leather covering material 7 is transmitted from the skin covering material sending unit 2. In the mounting portion 3, the positive electrode plate strips 17 are placed on one surface of the leather covering cloth 7 at intervals 27 to form an integrated cloth 18. Then, the adhesive is applied to the back surface of the integrated cloth 18 by the coating roll 28 that rotates around the axis. Here, by using a coating roll 28 having a recess 29 and a coating region 30, the adhesive is applied only to the back side portion of the positive electrode plate strip 17, and the back side of the interval 27 portion is not coated. Leave it as a work. Then, the cutting machine 5 cuts the intervals 27 of the integrated cloth 18 to form the integrated strip 31. The electrode laminated body 34 is obtained by laminating the integrated strips 31 together at the laminating portion 6.

FIG. 4 shows the manufacturing process of the electrode laminate 34 in the manufacturing apparatus 1 of the present embodiment as a flow focusing on each piece of cloth. In FIG. 4, for the negative electrode plate cloth supply section 8 and the positive electrode plate cloth supply section 19, the formation of the active material layer upstream of them and the slit portion in the longitudinal direction are also shown. On the other hand, for the part inside the manufacturing apparatus 1, only the coating of the adhesive and the final cutting machine 5 and the laminated part 6 are displayed, and the other parts are omitted.

The advantage of the manufacturing process shown in FIG. 4 is that the part related to the supply of the separator is very simple. According to the prior art, operations such as application of an adhesive, drying thereof, winding after drying, and transportation have been performed in the range P in FIG. However, in the present embodiment, with respect to the cloth of the separator, the adhesive (11) is only applied immediately before the bonding with the cloth of the negative electrode plate 13. In this respect, it can be said that the manufacturing apparatus 1 of this embodiment has a simple structure as compared with the conventional manufacturing process.

As described in detail above, according to the present embodiment, the longitudinal skin covering material 7 in which the negative electrode plate is sandwiched between the separators and the positive electrode plate strip 17 that has been cut into strips are integrated by the press roll 26. I'm supposed to do it. Therefore, the cutting machine 5 cuts the integrated piece 18 into the integrated strip 31 at a position where the positive electrode plate strip 17 is not present. As a result, the end portion of the negative electrode plate and the end portion of the positive electrode plate are separated from each other, so that an electrode laminate 34 in which a short circuit is unlikely to occur can be obtained. In addition, the manufacturing layer has a simple structure without a complicated process of drying the applied adhesive once.

It should be noted that the present embodiment is merely an example and does not limit the present invention in any way. Therefore, as a matter of course, the present invention can be improved and modified in various ways without departing from the gist thereof. For example, in the present embodiment, the positive electrode plate is supplied as the positive electrode plate cloth 23 and cut immediately before the bonding with the leather covering cloth 7 to obtain the positive electrode plate strip 17. However, the present invention is not limited to this, and a card-shaped positive electrode plate strip 17 provided from the beginning may be obtained and used for bonding with the leather covering cloth 7. Further, as for the leather covering cloth 7, the one provided with separators attached to both sides of the negative electrode plate from the beginning may be used. Further, the positive electrode and the negative electrode may be exchanged.

1 Manufacturing equipment 2 Skin-covered cloth delivery part 3 Mounting part 5 Cutting machine 6 Laminating part 7 Skin-covered cloth 17 Positive electrode plate strip 18 Integrated fabric 26 Press roll 27 Interval 28 Coating roll 29 Recess 30 Coating area 31 Integrated strip 32 Laminating table 34 Electrode laminated body

Claims (1)

It is an electrode laminate manufacturing apparatus that manufactures an electrode laminate in which a first electrode plate and a second electrode plate are laminated via a separator.
A leather-covered cloth delivery unit that sends out a leather-covered cloth that covers both sides of the second electrode cloth with a separator,
A mounting portion for obtaining an integrated piece of cloth by placing a strip of first electrode plate on one surface of the leather-covered piece of cloth at intervals.
A coating roll that applies an adhesive to the back surface of the integrated cloth, which is the surface opposite to the first electrode strip, by rotating around an axis.
A cutting portion that cuts the integrated piece of cloth coated with an adhesive at a position at a distance between the first plate strips to form an integrated strip, and
It has a laminated portion for laminating the integrated strips.
The coating roll
A coating area for applying an adhesive to a portion of the back surface corresponding to a portion of the first electrode strip, and a coating area.
An apparatus for manufacturing an electrode laminate, characterized in that the back surface has a concave non-coated area in which an adhesive is not applied in a range corresponding to a portion of the gap between the first electrode strips.

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