WO2020196314A1 - Method for manufacturing secondary battery stacked body - Google Patents

Abstract

The present invention provides an efficient method for manufacturing a secondary battery stacked body provided with a separator and an electrode. This manufacturing method includes a step (A) of obtaining a bonded body by bonding an elongate electrode roll obtained by forming an electrode mixture layer on at least one surface of a current collector, to an elongate separator roll, with an adhesive layer interposed therebetween, and a step (B) of obtaining a cut piece including an electrode roll piece and a separator roll piece by cutting the bonded body, wherein: the bonded body includes a plurality of adhesive layer non-arranged regions in which the adhesive layer is not arranged, extending over the entire width; the adhesive layer is arranged in adhesive layer arranged regions positioned between the adhesive layer non-arranged regions, toward the inside, in the width direction, of both width-direction ends of the separator, and between both width-direction ends of the electrode mixture layer; and the manufacturing method is additionally provided after step (B) with a step (C) of separating from the electrode roll piece a part of the separator roll piece that is not bonded to the electrode roll piece, and cutting at least a portion of the region that was facing said part to obtain a secondary battery stacked body.

Description

Manufacturing method of laminate for secondary battery

The present invention relates to a method for manufacturing a laminate for a secondary battery.

Secondary batteries such as lithium-ion secondary batteries are small and lightweight, have high energy density, and can be repeatedly charged and discharged, and are used in a wide range of applications. A secondary battery generally includes a positive electrode, a negative electrode, and a battery member such as a separator that separates the positive electrode and the negative electrode to prevent a short circuit between the positive electrode and the negative electrode.

Here, the structure of the secondary battery includes a laminated type in which positive electrodes, separators and negative electrodes are alternately laminated, and a wound type in which long positive electrodes, separators and negative electrodes are stacked and wound concentrically. Are known. In particular, in recent years, laminated secondary batteries have been attracting attention from the viewpoint of being excellent in energy density, safety, quality and durability.

Then, as a method for manufacturing a laminated secondary battery, for example, a method in which a first electrode wrapped in a separator and a second electrode are alternately laminated has been proposed (see, for example, Patent Document 1). .. Specifically, in Patent Document 1, the first strip-shaped electrode raw fabric is sandwiched from both sides by the strip-shaped separator raw fabric having a plurality of mountain folds formed in the lateral direction to form the first strip-shaped electrode raw fabric. After adhering the contact portion with the strip-shaped separator raw fabric, the first strip-shaped electrode raw fabric and the strip-shaped separator raw fabric are cut at the position of the mountain fold portion, and further, the cut pieces of the first strip-shaped electrode raw fabric (first). The electrode) is sealed at the portion constituting the mountain fold portion of the separator, and the obtained separator-sealed product of the first electrode and the second electrode are alternately laminated to form a laminated secondary battery. Manufacture.

JP-A-2017-63002

However, in the method for manufacturing a laminated secondary battery described in Patent Document 1, a first strip-shaped electrode raw fabric having substantially the same length in the longitudinal direction and a strip-shaped separator raw fabric having a mountain fold portion prepared in advance are used. A laminate of the first electrode and the separator is produced by bonding and cutting. Therefore, in the technique described in Patent Document 1, when a large number of laminated bodies are required for continuously manufacturing a laminated secondary battery, each member (original fabric) is prepared, bonded and cut. It was necessary to repeat the process alternately, and it was not possible to continuously and efficiently manufacture the laminated secondary battery.

To solve this problem, a roll-shaped long electrode raw fabric and a roll-shaped long separator raw fabric are used, and the electrode and the separator are laminated in a roll-to-roll manner. It is also possible to manufacture the body. However, in general, in a laminated secondary battery, a laminated body in which the size of the separator is larger than the electrode is required from the viewpoint of safety such as prevention of short circuit, and when the laminated body is manufactured by roll-to-roll. Since the overlapped electrode material and the separator material are cut, there is a problem that the dimensions of the electrode and the separator are the same between the cutting positions.

Therefore, an object of the present invention is to provide an efficient method for manufacturing a laminated body for a secondary battery including a separator and an electrode, which enables continuous and efficient manufacturing of the laminated secondary battery. ..

An object of the present invention is to advantageously solve the above problems, and the method for manufacturing a laminate for a secondary battery of the present invention is a part of the width direction of at least one surface of a long current collector. A long electrode raw fabric formed on the electrode mixture layer and a long separator raw fabric are attached via an adhesive layer arranged between the electrode mixture layer and the separator raw fabric. A step (A) of obtaining a bonded body together, and a step (B) of cutting the bonded body obtained in the step (A) to obtain a cut piece having an electrode raw fabric piece and a separator raw fabric piece. In the method for manufacturing a laminated body for a secondary battery, the bonded body has a cutting position in which the adhesive layer is not arranged over the entire width and is cut in the step (B). The adhesive layer has a plurality of non-dispersed regions of the adhesive layer, and the adhesive layer is inside the widthwise ends of the separator raw fabric between the non-dispersed regions of the adhesive layer and both ends in the width direction of the electrode mixture layer. The electrode of the separator raw fabric piece is disposed in the adhesive layer arrangement region located between them, and after the step (B), at least at a position corresponding to the adhesive layer non-dispersion region of the cut piece. The portion not bonded to the raw fabric piece is separated from the electrode raw fabric piece, and at least a part of the region of the electrode raw fabric piece facing the portion is cut to obtain a plan view dimension of the electrode mixture layer. Is further comprising a step (C) of obtaining a laminate for a secondary battery, which is smaller than the plan view size of the separator. In this way, if the step (C) is performed after cutting the bonded body having the adhesive layer non-dispersed region and the adhesive layer at a predetermined position at a predetermined cutting position, the plan view dimension of the electrode mixture layer becomes a separator. It is possible to efficiently manufacture a laminate for a secondary battery that is smaller than the plan view size of.

Here, in the method for manufacturing a laminated body for a secondary battery of the present invention, in the step (C), the separation and the cutting are performed in a state where the central portion of one surface of the cut piece is gripped by adsorption. Is preferable. If the central portion of one surface of the cut piece is gripped by adsorption, the separation and cutting in the step (C) can be easily performed.

Further, in the method for producing a laminate for a secondary battery of the present invention, it is preferable that the adhesive layer is arranged only in a part of the adhesive layer arrangement region. If the adhesive layer is arranged only in a part of the adhesive layer arrangement region, it is possible to obtain a laminate for a secondary battery having an excellent impregnation rate of the electrolytic solution and a low electric resistance.

Further, in the method for manufacturing a laminated body for a secondary battery of the present invention, in the step (C), the electrode is inserted by inserting a separating member between the separator raw fabric piece and the electrode raw fabric piece. It is preferable to separate it from the original piece. By using the separation member, it is possible to realize the separation of the portion of the separator raw material piece that is not bonded to the electrode raw material piece with a simple structure.

Further, in the method for producing a laminated body for a secondary battery of the present invention, in the step (C), the portion is adsorbed by an adsorption member from the side of the original sheet of the separator and separated from the original piece of the electrode to separate the area. It is preferable to cut all of the above and arrange the adhesive layer at least a part of the portion facing the place where the adsorption member is arranged. By doing so, it is possible to obtain a laminated body for a secondary battery in which the end portion of the electrode mixture layer is well adhered to the separator.

Then, in the method for producing a laminate for a secondary battery of the present invention, it is preferable that the suction member also grips the central portion of one surface of the cut piece by suction. If the cutting piece is gripped and the portion of the separator raw fabric piece that is not bonded to the electrode raw fabric piece is separated from the electrode raw fabric piece by the suction member, the separation and cutting in the step (C) can be performed more easily. can do.

According to the present invention, it is possible to efficiently manufacture a laminated body for a secondary battery including a separator and an electrode, which enables continuous and efficient production of the laminated secondary battery.

(A) is a cross-sectional view showing the structure of an example of a laminated body for a secondary battery, and (b) is an explanatory view showing the structure of an example of an electrode structure formed by using the laminated body for a secondary battery. is there. It is explanatory drawing which shows roughly the process of manufacturing the laminated body for a secondary battery using an example of the manufacturing method of the laminated body for a secondary battery of this invention. (A) to (d) are plan views which show the structure of the electrode raw fabric which can be used for manufacturing the laminated body for a secondary battery. (A) to (c) are plan views which show the structural example of the laminated body using the electrode raw fabric shown in FIG. 3 (a). (A) and (b) are plan views which show the structural example of the laminated body using the electrode raw fabric shown in FIG. 3 (b). (A) to (c) are plan views which show the structural example of the laminated body using the electrode raw fabric shown in FIG. 3 (c). (A) to (c) are plan views which show the structural example of the laminated body using the electrode raw fabric shown in FIG. 3 (d). (A) to (c) are plan views showing a configuration example of a cut piece obtained by cutting the bonded body shown in FIGS. 4 (a) to 4 (c), respectively. (A) and (b) are plan views showing a configuration example of a cut piece obtained by cutting the bonded body shown in FIGS. 5 (a) and 5 (b), respectively. (A) to (c) are plan views showing a configuration example of a cut piece obtained by cutting the bonded body shown in FIGS. 6 (a) to 6 (c), respectively. (A) to (c) are plan views showing a configuration example of a cut piece obtained by cutting the bonded body shown in FIGS. 7 (a) to 7 (c), respectively. (A) and (b) are plan views which show the structural example of the laminated body for a secondary battery. (A) to (e) are explanatory views showing an example of the arrangement shape of the adhesive layer. (A) to (c) are explanatory views showing an example of a method of gripping a cut piece. (A) and (b) are explanatory views which show an example of the method of separating a part of the separator raw fabric piece of a cut piece from the electrode raw fabric piece. It is explanatory drawing which shows another example of the method of separating a part of the separator raw fabric piece of a cut piece from the electrode raw fabric piece.

Hereinafter, the method for manufacturing the laminate for a secondary battery of the present invention will be described with reference to the drawings. In each drawing, the dimensions of some members are enlarged or reduced for easy understanding.

The method for producing a laminate for a secondary battery of the present invention can be used when producing a laminate for a secondary battery. Then, the laminated body for a secondary battery manufactured by using the method for manufacturing a laminated body for a secondary battery of the present invention can be used for manufacturing a laminated secondary battery or the like.

Specifically, the secondary battery laminate manufactured by using the method for manufacturing a secondary battery laminate of the present invention has a structure such that FIG. 1A shows a cross-sectional view along the stacking direction. are doing. Then, the laminated body for the secondary battery can be used for a laminated secondary battery or the like by superimposing the laminated body for a secondary battery as shown in FIG. 1 (b) to form an electrode structure.

Here, the laminated body 1 for a secondary battery shown in FIG. 1A has an electrode 10b in which electrode mixture layers 12b are provided on both sides of the current collector 11b, and has a size larger than that of the electrode 10b. It has a separator 20b bonded to the surface of one of the electrodes 10b (upper side in FIG. 1A).

Further, the electrode structure showing the cross section along the stacking direction in FIG. 1B is formed by superimposing the negative electrode laminate 1 and the positive electrode laminate 1', from the viewpoint of enhancing the safety of the secondary battery. , The size of the positive electrode 10b'is smaller than the size of the negative electrode 10b. In FIG. 1B, reference numeral 1 is a negative electrode laminate, 10b is a negative electrode, 11b is a negative electrode current collector, 12b is a negative electrode mixture layer, 1'is a positive electrode laminate, 10b'is a positive electrode, and 11b'is a positive electrode. The current collector, 12b'is a positive electrode mixture layer, and 20b is a separator. Further, 11c is a negative electrode current collector located at the lower end in the stacking direction, and 11d is a positive electrode current collector located at the upper end in the stacking direction.

Then, in the method for manufacturing a laminated body for a secondary battery of the present invention, electrodes are provided on the surface of a long current collector 11 as schematically an example of a process for manufacturing a laminated body for a secondary battery is shown in FIG. A step of laminating a long electrode raw fabric 10 formed of a mixed material layer 12 and a long separator raw fabric 20 via an adhesive layer 30 with, for example, a laminating roll 50 to obtain a laminating body 40. (A) and the step (B) of cutting the bonded body 40 obtained in the step (A) using, for example, a laser cutter 60 to obtain a cut piece 40a having an electrode raw fabric piece 10a and a separator raw fabric piece 20a. Then, a part of the separator raw fabric piece 20a of the cut piece 40a is separated from the electrode raw fabric piece 10a (rolled up in the illustrated example), and a part of the electrode raw fabric piece 10a is cut to form a flat surface of the electrode mixture layer. The step (C) of obtaining a laminated body 1 for a secondary battery whose visual dimension is smaller than the plan view dimension of the separator is included.
In a laminated secondary battery, a laminated body having a separator size larger than that of an electrode is required from the viewpoint of safety such as short-circuit prevention. In this way, in step (C) after cutting the bonded body. If a part of the separator raw fabric piece 20a is separated from the electrode raw fabric piece 10a and a part of the electrode raw fabric piece 10a is cut, the outer peripheral edge of the electrode mixture layer is inside the outer peripheral edge of the separator in a plan view. It is possible to continuously and efficiently manufacture the laminated body 1 for a secondary battery, which is located and whose plan view dimension of the electrode mixture layer is smaller than the plan view dimension of the separator. Therefore, a laminated secondary battery having excellent safety can be continuously and efficiently manufactured. When the laminated body 1 for a secondary battery is continuously manufactured, from the viewpoint of improving the manufacturing efficiency, the long electrode raw fabric 10 and the long separator raw fabric 20 are unwound from the rolled state. It is preferable to repeat the above steps (A) to (C).

Hereinafter, steps (A) to (C) of the method for manufacturing a laminate for a secondary battery of the present invention will be described in more detail with specific examples.

(Step (A))
In the step (A), a long electrode material obtained by forming an electrode mixture layer on at least one surface of the long current collector in the width direction and a long separator material are used as electrodes. A bonded body is obtained by bonding via an adhesive layer arranged within a predetermined range between the mixture layer and the original separator.

Here, the long current collector is not particularly limited, and for example, a band-shaped current collector 11 as shown in the plan view in FIGS. 3A and 3B may be used. As shown in the plan view in FIGS. 3C and 3D, a substantially band-shaped current collector 11 in which tabs T are formed at predetermined intervals on one side in the width direction (upper side in the illustrated example) may be used. ..

Further, the surface forming the electrode mixture layer may be one side of the current collector or both sides. Above all, from the viewpoint of efficiently manufacturing the laminated secondary battery, it is preferable that the electrode mixture layers are formed on both sides of the current collector.

Further, the range of forming the electrode mixture layer is not particularly limited as long as it is a part of the surface of the long current collector in the width direction, but as shown in FIGS. 3 (a) to 3 (d), for example, the electrode base is formed. It can be a range in which a current collector portion in which the electrode mixture layer 12 is not formed can exist on at least one side (upper side in the illustrated example) of the counter 10.

Specifically, as shown in FIG. 3A, the electrode raw fabric 10 has a current collector portion on which the electrode mixture layer 12 is not formed on one side in the width direction (upper side in the illustrated example). In addition, it is assumed that the electrode mixture layer 12 is formed with a width narrower than the width of the current collector 11 from the other end in the width direction (the lower end in the illustrated example) of the band-shaped current collector 11 to the one end side in the width direction. it can.
Further, as shown in FIG. 3B, the electrode raw fabric 10 has the width of the band-shaped current collector 11 so that the current collector portion in which the electrode mixture layer 12 is not formed exists in both the width directions. It can be assumed that the electrode mixture layer 12 is formed in the central portion of the direction with a width narrower than the width of the current collector 11.
Further, as shown in FIG. 3C, the electrode raw fabric 10 has a width such that a current collector portion in which the electrode mixture layer 12 is not formed exists on one side in the width direction (upper side in the illustrated example). The electrode mixture layer 12 is formed in a portion other than the tab T of the substantially band-shaped current collector 11 in which tabs T are formed at predetermined intervals on one side in the direction with a width narrower than the width (maximum width) of the current collector 11. Can be assumed to have been done.
Further, as shown in FIG. 3D, the electrode raw fabric 10 has a width such that a current collector portion in which the electrode mixture layer 12 is not formed exists on one side in the width direction (upper side in the illustrated example). A portion (band-shaped) of the current collector 11 excluding the tab T from the other end in the width direction (lower end in the illustrated example) to the one end side in the width direction of the substantially band-shaped current collector 11 in which tabs T are formed on one side in the direction at predetermined intervals. It can be assumed that the electrode mixture layer 12 is formed with a width narrower than the width of the portion).

Among the above, the electrode raw fabrics are shown in FIGS. 3A, 3C, and 3D from the viewpoint of making it possible to narrow the range of cutting and removing from the cut piece in the step (C) described in detail later. ), It is preferable that the current collector portion in which the electrode mixture layer 12 is not formed exists only on one side in the width direction of the electrode raw fabric 10. Further, from the viewpoint of improving the ease of preparation and transportation of the current collector 11 while narrowing the range of cutting and removing from the cut piece in the step (C), the electrode raw fabric is as shown in FIG. 3 (a). It is more preferable to have a structure.

The long separator raw fabric is not particularly limited, and for example, a strip-shaped separator raw fabric can be used.
From the viewpoint of making it possible to narrow the range of cutting and removing from the cut piece in the step (C), the width of the separator raw fabric is wider than the electrode mixture layer of the electrode raw fabric to be bonded. Is preferable.

The adhesive layer is not particularly limited as long as the electrode mixture layer and the separator raw material can be adhered without inhibiting the battery reaction, and any adhesive material used in the field of secondary batteries can be used. The adhesive layer formed in use can be used. Here, as the adhesive material, it is preferable to use an adhesive material made of a polymer. The polymer constituting the adhesive material may be of only one type or of two or more types. Further, the formation of the adhesive layer using the adhesive material is not particularly limited, and can be performed by using a known coating method such as an inkjet method, a spray method, a dispenser method, a gravure coating method, or a screen printing method. .. Above all, from the viewpoint that the amount and range of the adhesive material to be applied can be easily adjusted, it is preferable to apply the adhesive material by using an inkjet method.

Further, the target for arranging the adhesive layer may be only the electrode mixture layer of the electrode material, the separator material alone, or the electrode mixture layer of the electrode material and the separator material. It may be both.

Further, the range in which the adhesive layer is arranged needs to be within a predetermined adhesive layer arrangement area. Here, the adhesive layer arrangement region is between the predetermined adhesive layer non-arrangement regions when the bonded body is formed, and is inside the width direction of both ends of the separator raw material in the width direction and of the electrode mixture layer. It is an area located between both ends in the width direction. Further, the adhesive layer non-dispersed region is a region in which a plurality of regions are separated from each other in the longitudinal direction of the bonded body when the bonded body is formed, and includes a cutting position to be cut in the step (B). This is a region where the adhesive layer is not arranged over the entire width.
Here, "between the adhesive layer non-dispersed regions" is assumed to include on the boundary line with the adhesive layer non-dispersed region, and "between both ends in the width direction" is assumed to include both ends in the width direction. Both ends in the width direction are not included in "inside the width direction than both ends in the width direction".

The adhesive layer may be provided in the entire adhesive layer arrangement area as long as it is in the adhesive layer arrangement area, or may be provided only in a part of the adhesive layer arrangement area. Above all, from the viewpoint of obtaining a laminate for a secondary battery having an excellent impregnation rate of the electrolytic solution and a low electrical resistance, the adhesive layer is preferably provided only in a part of the adhesive layer arrangement region.

Specifically, the arrangement position and arrangement shape of the adhesive layer in the adhesion layer arrangement region are not particularly limited, and may be, for example, the positions and shapes as shown in FIGS. 13 (a) to 13 (e). it can. In addition, in FIGS. 13A to 13E, the adhesive layer arrangement region is the region located between the regions NB'on the electrode mixture layer 12a of the electrode raw fabric piece 10a.
Here, in FIG. 13A, a plurality of rectangular adhesive layers are arranged in dots at a predetermined pitch over the entire adhesive layer arrangement area.
Further, in FIG. 13B, rectangular adhesive layers are arranged at the four corners of the adhesive layer arrangement area.
Further, in FIG. 13C, the adhesive layer is arranged in the entire adhesive layer arrangement area.
Further, in FIG. 13D, the adhesive layer is arranged in the portion of the adhesive layer arrangement region adjacent to the region NB'.
Then, in FIG. 13 (e), the adhesive layers are arranged at both ends in the adhesive layer arrangement region when viewed in the extending direction (vertical direction in the illustrated example) of the region NB'.
Among the above, from the viewpoint of improving the impregnation speed of the electrolytic solution and reducing the electric resistance, the arrangement position and arrangement shape of the adhesive layer in the adhesive layer arrangement region are as shown in FIG. 13 (b). It is preferably at the four corners of the layer arrangement region. On the other hand, from the viewpoint of improving the impregnation speed of the electrolytic solution, reducing the electric resistance, and securing the adhesive force, the arrangement position and the arrangement shape of the adhesive layer in the adhesion layer arrangement region are shown in FIG. As shown in a), it is preferable that the adhesive layer is in a dot shape over the entire arrangement region.

The bonded body is not particularly limited as long as the electrode raw fabric and the separator raw fabric are bonded via an adhesive layer arranged in at least a part of the adhesive layer arrangement region, for example. It has the structure shown in FIGS. 4 to 7.
In the following, the case where the separator raw fabric is bonded to only one side of the electrode raw fabric will be described, but the separator raw fabric may be bonded to both sides of the electrode raw fabric.

Here, the bonded body 40 shown in FIGS. 4 (a) to 4 (c) is formed by bonding the electrode raw fabric 10 shown in FIG. 3 (a) and the separator raw fabric 20.
Specifically, in the bonded body 40 shown in FIG. 4A, the electrode raw fabric 10 and the separator raw fabric 20 having a width wider than the electrode mixture layer 12 of the electrode raw fabric 10 are formed on the separator raw fabric 20. One end in the width direction (upper end in the illustrated example) is located between one end in the width direction (upper end in the illustrated example) of the current collector 11 and one end in the width direction (upper end in the illustrated example) of the electrode mixture layer 12, and a separator. The electrode mixture layer 12 is located inside the width direction of both ends of the original fabric 20 (that is, the other end of the separator original fabric 20 in the width direction is wider than the other end of the electrode mixture layer 12 in the width direction). It is attached (so that it is located on the outside).
Further, in the bonded body 40 shown in FIG. 4B, the electrode raw fabric 10 and the separator raw fabric 20 having a width wider than the electrode mixture layer 12 of the electrode raw fabric 10 are formed at one end in the width direction of the separator raw fabric 20. Is bonded so as to be located on one end in the width direction of the electrode mixture layer 12.
Further, in the bonded body 40 shown in FIG. 4C, the electrode raw fabric 10 and the separator raw fabric 20 having a width wider than the electrode mixture layer 12 of the electrode raw fabric 10 are formed at one end in the width direction of the separator raw fabric 20. Is located between one end in the width direction of the current collector 11 and one end in the width direction (upper end in the illustrated example) of the electrode mixture layer 12, and the other end in the width direction of the separator original fabric 20 is the width direction of the electrode mixture layer 12. It is laminated so that it is located on the other end.
Then, in the bonded body 40 shown in FIGS. 4 (a) to 4 (c), a plurality of adhesive layer non-dispersed regions NB including the cutting position C to be cut in the step (B) are provided at intervals in the longitudinal direction. It is formed. Further, the adhesive layer arrangement region in the bonded body 40 is between the adhesive layer non-arranged regions NB adjacent to each other in the longitudinal direction, and is inside the width direction and inside the electrode mixture layer from both ends in the width direction of the separator original fabric 20. It is a region located between both ends in the width direction of 12.

Further, the bonded body 40 shown in FIGS. 5 (a) and 5 (b) is formed by bonding the electrode raw fabric 10 shown in FIG. 3 (b) and the separator raw fabric 20.
Specifically, in the bonded body 40 shown in FIG. 5A, the electrode raw fabric 10 and the separator raw fabric 20 having a width wider than the electrode mixture layer 12 of the electrode raw fabric 10 are formed on the separator raw fabric 20. The electrode mixture layer 12 is located inside the width direction from both ends in the width direction (that is, one end in the width direction of the separator raw fabric 20 is one end in the width direction of the current collector 11 and one end in the width direction of the electrode mixture layer 12. The other end in the width direction of the separator original fabric 20 is located between the other end in the width direction of the current collector 11 and the other end in the width direction of the electrode mixture layer 12).
Further, in the bonded body 40 shown in FIG. 5B, the electrode raw fabric 10 and the separator raw fabric 20 having a width wider than the electrode mixture layer 12 of the electrode raw fabric 10 are formed at one end in the width direction of the separator raw fabric 20. Is located between one end in the width direction of the current collector 11 and one end in the width direction of the electrode mixture layer 12, and the other end in the width direction of the separator raw fabric 20 is located on the other end in the width direction of the electrode mixture layer 12. It will be pasted together like this.
Then, in the bonded body 40 shown in FIGS. 5A and 5B, a plurality of adhesive layer non-dispersed regions NB including the cutting position C to be cut in the step (B) are provided at intervals in the longitudinal direction. It is formed. Further, the adhesive layer arrangement region in the bonded body 40 is between the adhesive layer non-arranged regions NB adjacent to each other in the longitudinal direction, and is inside the width direction and inside the electrode mixture layer from both ends in the width direction of the separator original fabric 20. It is a region located between both ends in the width direction of 12.

Further, the bonded body 40 shown in FIGS. 6 (a) to 6 (c) is formed by bonding the electrode raw fabric 10 shown in FIG. 3 (c) and the separator raw fabric 20.
Specifically, in the bonded body 40 shown in FIG. 6A, the electrode raw fabric 10 and the separator raw fabric 20 having a width wider than the electrode mixture layer 12 of the electrode raw fabric 10 are formed on the separator raw fabric 20. One end in the width direction is located between one end in the width direction of the current collector 11 (the upper end of the tab T in the illustrated example) and one end in the width direction of the electrode mixture layer 12, and more than both ends in the width direction of the separator original fabric 20. Laminated so that the electrode mixture layer 12 is located inside in the width direction (that is, the other end in the width direction of the separator raw fabric 20 is located outside the width direction of the electrode mixture layer 12). It becomes.
Further, in the bonded body 40 shown in FIG. 6B, the electrode raw fabric 10 and the separator raw fabric 20 having a width wider than the electrode mixture layer 12 of the electrode raw fabric 10 are formed at one end in the width direction of the separator raw fabric 20. Is located between one end in the width direction of the current collector 11 (the upper end of the tab T in the illustrated example) and one end in the width direction of the electrode mixture layer 12, and the other end in the width direction of the separator original fabric 20 is the electrode mixture layer 12. It is laminated so that it is located on the other end in the width direction of.
Further, in the bonded body 40 shown in FIG. 6C, the electrode raw fabric 10 and the separator raw fabric 20 having a width wider than the electrode mixture layer 12 of the electrode raw fabric 10 are formed at one end in the width direction of the separator raw fabric 20. Is bonded so as to be located on one end in the width direction of the electrode mixture layer 12.
Then, in the bonded body 40 shown in FIGS. 6 (a) to 6 (c), a plurality of adhesive layer non-dispersed regions NB including the cutting position C to be cut in the step (B) are provided at intervals in the longitudinal direction. It is formed. Further, the adhesive layer arrangement region in the bonded body 40 is between the adhesive layer non-arranged regions NB adjacent to each other in the longitudinal direction, and is inside the width direction and inside the electrode mixture layer from both ends in the width direction of the separator original fabric 20. It is a region located between both ends in the width direction of 12.

The bonded body 40 shown in FIGS. 7 (a) to 7 (c) is obtained by bonding the electrode raw fabric 10 shown in FIG. 3 (d) and the separator raw fabric 20.
Specifically, in the bonded body 40 shown in FIG. 7A, the electrode raw fabric 10 and the separator raw fabric 20 having a width wider than the electrode mixture layer 12 of the electrode raw fabric 10 are formed on the separator raw fabric 20. One end in the width direction is located between one end in the width direction of the current collector 11 and one end in the width direction of the electrode mixture layer 12 (on the tab T of the current collector 11 in the illustrated example), and the width of the separator original fabric 20. The electrode mixture layer 12 is located inside the width direction from both ends in the direction (that is, the other end in the width direction of the separator raw fabric 20 is located outside the width direction of the other end in the width direction of the electrode mixture layer 12). To) It will be pasted together.
Further, in the bonded body 40 shown in FIG. 7B, the electrode raw fabric 10 and the separator raw fabric 20 having a width wider than the electrode mixture layer 12 of the electrode raw fabric 10 are formed at one end in the width direction of the separator raw fabric 20. Is located between one end in the width direction of the current collector 11 and one end in the width direction of the electrode mixture layer 12 (on the tab T of the current collector 11 in the illustrated example), and the other end in the width direction of the separator original fabric 20 is an electrode. The mixture layer 12 is bonded so as to be located on the other end in the width direction.
Further, in the bonded body 40 shown in FIG. 7C, the electrode raw fabric 10 and the separator raw fabric 20 having a width wider than the electrode mixture layer 12 of the electrode raw fabric 10 are formed at one end in the width direction of the separator raw fabric 20. Is bonded so as to be located on one end in the width direction of the electrode mixture layer 12.
Then, in the bonded body 40 shown in FIGS. 7 (a) to 7 (c), a plurality of adhesive layer non-dispersed regions NB including the cutting position C to be cut in the step (B) are provided at intervals in the longitudinal direction. It is formed. Further, the adhesive layer arrangement region in the bonded body 40 is between the adhesive layer non-arranged regions NB adjacent to each other in the longitudinal direction, and is inside the width direction and inside the electrode mixture layer from both ends in the width direction of the separator original fabric 20. It is a region located between both ends in the width direction of 12.

Among the above, the bonded body 40 preferably has a structure as shown in FIGS. 4, 6 and 7 from the viewpoint of making it possible to narrow the range of cutting and removing from the cut piece in the step (C). , FIG. 4 (a), FIG. 6 (a), and FIG. 7 (a) are more preferable. Further, from the viewpoint of improving the ease of preparation and transportation of the current collector 11 while narrowing the range of cutting and removing from the cut piece in the step (C), the bonded body 40 is shown in FIG. 4 (a). It is more preferable to have such a structure.
In the bonded body shown in FIGS. 4 to 7, the electrode mixture layer is formed between both ends in the width direction of the separator raw material from the viewpoint of making it possible to narrow the range of cutting and removing from the cut piece in the step (C). A long current collector and a long electrode original fabric are bonded together so as to be located at, but the structure of the bonded body is not limited to the structures shown in FIGS. 4 to 7.

(Step (B))
In the step (B), the bonded body obtained in the step (A) is cut to have an electrode raw fabric piece made of a cut piece of the electrode raw fabric and a separator raw fabric piece made of a cut piece of the separator raw fabric. Get a piece.

Here, the bonded body is not particularly limited, and can be cut using, for example, a laser or a cutting blade, and it is preferable to cut using a laser from the viewpoint of easy and efficient cutting. .. The cutting can be performed in a state where the portion to be the cutting piece (the end portion in the longitudinal direction of the laminated body) is gripped. The gripping method is not particularly limited, for example, a method of sucking one surface with the suction member 71 as shown in FIG. 14A, and sandwiching the surface with a rod 72 as shown in FIG. 14B. A method or a method of sandwiching between plates 73 as shown in FIG. 14 (c) can be used. Above all, from the viewpoint that the step (C) can be easily carried out after the step (B), as a gripping method, as shown in FIG. 14A, a method of sucking the central portion of one surface with the suction member 71. Is preferable.

Then, the cut piece obtained in the step (B) has a structure in which the separator original piece and the electrode original piece are bonded at the position where the adhesive layer is arranged. In other words, the cut piece is located at a position other than at least a portion corresponding to the adhesive layer arrangement region (a position corresponding to the adhesive layer non-arrangement region) in the portion where the separator original fabric piece and the electrode original fabric piece face each other. Including), the separator raw fabric piece and the electrode raw fabric piece are not bonded.

The cut pieces obtained by cutting the bonded body 40 shown in FIGS. 4 to 7 at the cutting position C have a structure as shown in FIGS. 8 to 11.

Specifically, the cut pieces 40a obtained by cutting the bonded body 40 shown in FIGS. 4 (a) to 4 (c) at the cutting position C are as shown in FIGS. 8 (a) to 8 (c), respectively. It becomes a structure.
Further, the cut pieces 40a obtained by cutting the bonded body 40 shown in FIGS. 5 (a) and 5 (b) at the cutting position C have a structure as shown in FIGS. 9 (a) and 9 (b), respectively. ..
Further, the cut pieces 40a obtained by cutting the bonded body 40 shown in FIGS. 6 (a) to 6 (c) at the cutting position C have a structure as shown in FIGS. 10 (a) to 10 (c), respectively. ..
Further, the cut pieces 40a obtained by cutting the bonded body 40 shown in FIGS. 7 (a) to 7 (c) at the cutting position C have a structure as shown in FIGS. 11 (a) to 11 (c), respectively. ..
Here, in FIGS. 8 to 11, reference numeral 40a indicates a cut piece, 10a indicates an electrode original piece, 11a indicates a current collector piece, 12a indicates an electrode mixture layer, and 20a indicates a separator original piece. NB'indicates the position corresponding to the adhesive layer non-dispersion region NB.

(Step (C))
In the step (C), the outer peripheral edge of the electrode mixture layer is inside the outer peripheral edge of the separator in a plan view by cutting a part of the electrode raw fabric piece from the cut piece obtained in the step (B). A laminated body for a secondary battery is obtained which is located and whose plan view dimension of the electrode mixture layer is smaller than the plan view dimension of the separator.

Specifically, as shown in FIGS. 8 to 11, the cut pieces obtained in the step (B) have the same dimensions of the electrode raw fabric piece and the separator raw fabric piece between the cutting positions, and each cutting position. On the side (left side and right side in the illustrated example), the edge of the original separator piece and the edge of the electrode mixture layer are at the same position. The cut pieces obtained in the step (B) are, for example, FIG. 8 (b), FIG. 8 (c), FIG. 9 (b), FIG. 10 (b), FIG. 10 (c), FIG. 11 (b), As shown in FIG. 11 (c), at least one of the edge edges orthogonal to the edge edge on the cutting position side of the original separator piece (at least one of the upper end edge and the lower end edge in the illustrated example) and the electrode mixture layer are cut. At least one of the edge edges orthogonal to the edge on the position side (at least one of the upper edge and the lower edge in the illustrated example) is in the same position, or does not have a tab T as shown in FIGS. Orthogonal.
Therefore, in the step (C), at least at a position corresponding to the region where the adhesive layer is not arranged, the portion of the cut piece that is not bonded to the electrode raw piece is separated from the electrode raw piece to separate the separator. At least a part of the region exposed by the separation of the raw fabric pieces (the region facing the portion of the separator raw fabric piece that is not bonded to the electrode raw fabric piece) is cut. Further, in the step (C), if necessary, the electrodes of the original separator piece are electrode at least one of both ends in the extending direction (vertical direction in FIGS. 8 to 11) of the edge on the cutting position side of the cut piece. The part that is not bonded to the raw fabric piece is separated from the electrode raw fabric piece, and the area exposed by the separation of the separator raw fabric piece (the area that faces the part that is not bonded to the electrode raw fabric piece of the separator raw fabric piece). ) Is cut off. As a result, in the step (C), for example, as shown in FIGS. 12A and 12B, the electrode 10b and the separator 20b bonded to one surface of the electrode 10b are provided, and the separator 20b is provided in a plan view. The outer peripheral edge of the electrode mixture layer 12b is located inside the outer peripheral edge, and the tab formed of a part of the current collector 11b projects outward from the upper end of the separator 20. Can be obtained efficiently.

More specifically, for example, in the cut piece 40a shown in FIG. 8A, the electrode raw fabric exposed by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at both ends in the left-right direction in which the region NB'is located. A tab is formed on the current collector piece 11a that is exposed by cutting the piece 10a and further separating the separator original piece 20a located above the upper end of the electrode mixture layer 12a from the current collector piece 11a. By cutting as described above, the laminate 1 for a secondary battery can be obtained as shown in FIG. 12 (a).
Further, the cut piece 40a shown in FIG. 8B cuts the exposed electrode raw fabric piece 10a by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at both ends in the left-right direction in which the region NB'is located. Further, by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at the upper part and cutting the exposed electrode mixture layer 12a and the current collector piece 11a so as to form a tab, FIG. 12A ) Can be used as the secondary battery laminate 1.
Further, the cut piece 40a shown in FIG. 8C cuts the exposed electrode raw fabric piece 10a by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at both ends in the left-right direction in which the region NB'is located. In the upper part, the separator original piece 20a located above the upper end of the electrode mixture layer 12a is separated from the current collector piece 11a, and the exposed current collector piece 11a is cut so as to form a tab, and further. In the lower part, the separator raw fabric piece 20a is separated from the electrode raw fabric piece 10a and the exposed electrode raw fabric piece 10a is cut to obtain a laminated body 1 for a secondary battery as shown in FIG. 12 (a). Can be done.

Further, the cut piece 40a shown in FIG. 9A cuts the exposed electrode raw fabric piece 10a by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at both ends in the left-right direction in which the region NB'is located. In the upper part, the separator original piece 20a located above the upper end of the electrode mixture layer 12a is separated from the current collector piece 11a, and the exposed current collector piece 11a is cut so as to form a tab, and further. In the lower part, the separator original piece 20a is separated from the current collector piece 11a, and the exposed current collector piece 11a is cut to obtain a laminated body 1 for a secondary battery as shown in FIG. 12A. Can be done.
Further, the cut piece 40a shown in FIG. 9B cuts the exposed electrode raw fabric piece 10a by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at both ends in the left-right direction in which the region NB'is located. In the upper part, the separator original piece 20a located above the upper end of the electrode mixture layer 12a is separated from the current collector piece 11a, and the exposed current collector piece 11a is cut so as to form a tab, and further. In the lower part, the separator raw fabric piece 20a is separated from the electrode raw fabric piece 10a and the exposed electrode raw fabric piece 10a is cut to obtain a laminated body 1 for a secondary battery as shown in FIG. 12 (a). Can be done.

The cut piece 40a shown in FIG. 10A is formed by cutting the exposed electrode raw fabric piece 10a by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at both ends in the left-right direction in which the region NB'is located. , The laminated body 1 for a secondary battery as shown in FIG. 12A can be obtained.
Further, the cut piece 40a shown in FIG. 10B cuts the exposed electrode raw fabric piece 10a by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at both ends in the left-right direction in which the region NB'is located. Further, by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at the lower portion and cutting the exposed electrode raw fabric piece 10a, the laminated body 1 for a secondary battery as shown in FIG. 12A is obtained. can do.
Further, the cut piece 40a shown in FIG. 10C cuts the exposed electrode raw fabric piece 10a by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at both ends in the left-right direction in which the region NB'is located. Further, by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at the upper part and cutting the exposed electrode raw fabric piece 10a so that the tab remains, the secondary battery as shown in FIG. 12A is formed. Can be used as the laminated body 1.

The cut piece 40a shown in FIG. 11A is formed by cutting the exposed electrode raw fabric piece 10a by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at both ends in the left-right direction in which the region NB'is located. , The laminated body 1 for a secondary battery as shown in FIG. 12B can be obtained.
Further, the cut piece 40a shown in FIG. 11B cuts the exposed electrode raw fabric piece 10a by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at both ends in the left-right direction in which the region NB'is located. Further, by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at the lower portion and cutting the exposed electrode raw fabric piece 10a, the laminated body 1 for the secondary battery as shown in FIG. 12 (b) can be obtained. can do.
Further, the cut piece 40a shown in FIG. 11C cuts the exposed electrode raw fabric piece 10a by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at both ends in the left-right direction in which the region NB'is located. Further, by separating the separator raw fabric piece 20a from the electrode raw fabric piece 10a at the upper part and cutting the exposed electrode raw fabric piece 10a so that the tab remains, the secondary battery as shown in FIG. 12A is formed. Can be used as the laminated body 1.

Then, in the step (C), the separation of the separator raw fabric piece and the cutting of a part of the electrode raw fabric piece can be performed in a state where the cut piece is gripped by an arbitrary gripping method without particular limitation. The gripping method is not particularly limited, for example, a method of sucking one surface with the suction member 71 as shown in FIG. 14A, and sandwiching the surface with a rod 72 as shown in FIG. 14B. A method or a method of sandwiching between plates 73 as shown in FIG. 14 (c) can be used. Among them, as the gripping method, a method of sucking the central portion of one surface with the suction member 71 as shown in FIG. 14A is preferable. When the rod 72 or the plate 73 is used, the separator raw fabric piece cannot be separated and the electrode raw fabric piece cannot be cut at the portion where the rod 72 or the plate 73 extends, but the center of the surface of the cut piece. By adsorbing and grasping the part, it is possible to separate the separator raw material piece and cut a part of the electrode raw material piece in any direction at the end of the cut piece without the work load such as changing the cutting piece. it can.

Further, in the step (C), the separation of the separator raw fabric piece is not particularly limited, and for example, as shown in FIG. 15A, the separating member 81 is arranged on the separator raw fabric piece 20a, and the separating member 81 is separated. This may be done by rolling up or hanging the separator raw fabric piece 20a along the above, or as shown in FIG. 15B, a separating member between the separator raw fabric piece 20a and the electrode raw fabric piece 10a. It may be carried out by inserting 82, or for example, as shown in FIG. 16, it may be carried out by sucking the separator raw fabric piece 20a with the suction member 83 (the side portion of the suction member 83 in the illustrated example).
In FIGS. 15 and 16, reference numeral 20a'refers to a portion of the separator original fabric piece 20a separated from the electrode original fabric piece 10a.

Here, when the separator raw fabric piece 20a is separated as shown in FIGS. 15A and 16, an adhesive layer is provided on at least a part of a portion facing the place where the separation member 81 and the suction member 83 are arranged. It is preferred to place and cut the entire exposed portion. In the method as shown in FIG. 15B, the adhesive layer cannot be arranged at the portion where the separation member 82 is inserted, and in the obtained laminated battery for a secondary battery, the end portion of the electrode mixture layer is used as a separator. Although it cannot be bonded, the adhesive layer is arranged at least a part of the portion facing the place where the separation member 81 and the suction member 83 are arranged in the method shown in FIGS. 15 (a) and 16 to form a separator source. By cutting all the exposed portions due to the separation of the piece 20a, it is possible to obtain a laminated body for a secondary battery in which the end portion of the electrode mixture layer is well adhered to the separator.

Then, in the step (C), if the separating members 81 and 82 are used as shown in FIGS. 15A and 15B, the separator original fabric piece 20a can be separated with a simple structure.

Further, in the step (C), if the suction member 83 is used as shown in FIG. 16, the separator raw fabric piece 20a can be efficiently separated. When the suction member 83 is used, if the central portion of one surface of the cut piece is also gripped by the suction member 83, the separator raw cloth piece can be separated and the electrode raw cloth piece can be cut more easily. Can be done.

Although the method for manufacturing the laminate for a secondary battery of the present invention has been described above with an example, the method for producing a laminate for a secondary battery of the present invention is not limited to the above-mentioned contents.

According to the present invention, it is possible to efficiently manufacture a laminated body for a secondary battery including a separator and an electrode, which enables continuous and efficient production of the laminated secondary battery.

1 Rechargeable battery laminate (negative electrode laminate)
1'Positive electrode laminate 10 Electrode raw fabric 10a Electrode raw fabric piece 10b Electrode (negative electrode)
10b'Positive electrode 11 Current collector 11a Current collector piece 11b Current collector (Negative current collector)
11b'Positive current collector 11c Negative electrode current collector 11d Positive electrode current collector 12 Electrode mixture layer 12a Electrode mixture layer 12b Electrode mixture layer (negative electrode mixture layer)
12b'Positive electrode mixture layer 20 Separator raw fabric 20a Separator raw fabric piece 20a' Separated part 20b Separator 30 Adhesive layer 40 Laminated body 40a Cut piece 50 Laminated roll 60 Laser cutter 71 Adsorption member 72 Rod 73 Plate 81 Separation member 82 Separation member 83 Adsorption member T tab NB'Region NB Adhesive layer non-dispersion region

Claims (6)

1. The electrode mixture layer and the long separator raw fabric, which are formed by forming an electrode mixture layer on at least one surface of the long current collector in the width direction, and the long separator original fabric, are combined with the electrode mixture layer. The step (A) of obtaining a bonded body by laminating via an adhesive layer arranged between the separator raw fabric and the electrode raw fabric piece by cutting the bonded body obtained in the step (A). A method for manufacturing a laminate for a secondary battery, which comprises a step (B) of obtaining a cut piece having a separator raw material piece.
   The bonded body has a plurality of non-adhesive layer non-dispersed regions including a cutting position to be cut in the step (B) and the adhesive layer is not arranged over the entire width.
   The adhesive layer is arranged in the adhesive layer arrangement region located between the adhesive layer non-dispersed regions, inside the width direction of both ends of the separator original fabric in the width direction, and between the width direction both ends of the electrode mixture layer. Set up
   After the step (B), the portion of the cut piece that is not bonded to the electrode raw fabric piece at least at a position corresponding to the adhesive layer non-dispersed region is the electrode raw fabric piece. A laminated body for a secondary battery in which the plan view dimension of the electrode mixture layer is smaller than the plan view dimension of the separator by cutting at least a part of the region facing the portion of the electrode raw fabric piece. A method for producing a laminate for a secondary battery, further comprising a step (C) for obtaining the above.
2. The method for manufacturing a laminate for a secondary battery according to claim 1, wherein in the step (C), the separation and the cutting are performed in a state where the central portion of one surface of the cut piece is gripped by adsorption.
3. The method for manufacturing a laminate for a secondary battery according to claim 1 or 2, wherein the adhesive layer is arranged only in a part of the adhesive layer arrangement area.
4. According to any one of claims 1 to 3, in the step (C), the portion is separated from the electrode raw fabric piece by inserting a separating member between the separator raw fabric piece and the electrode raw fabric piece. The method for manufacturing a laminate for a secondary battery described.
5. In the step (C), the portion is adsorbed from the separator raw fabric piece side by an adsorption member to be separated from the electrode raw fabric piece, and the entire region is cut.
   The method for manufacturing a laminate for a secondary battery according to any one of claims 1 to 3, wherein the adhesive layer is arranged at least a part of a portion facing the place where the suction member is arranged.
6. The method for manufacturing a laminated body for a secondary battery according to claim 5, wherein the suction member also grips the central portion of one surface of the cut piece by suction.

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