JP2001043848A - Manufacture of polymer battery and peeling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a technique of peeling/removing a coating film comprising an active-material layer and a gel-polymer layer in a desired position to a minimal size from a current collector at a high speed without using an adhesive tape for peeling. SOLUTION: This manufacturing method of a polymer battery is provided with a process for forming a coating film 32 by layering an active-material layer (33) and a gel-polymer layer (34), in order, on a current collector 31, and a process for forming a terminal mounting part (35) by pressing and heating an adhesive body 22 having a shape equal to a terminal-mounting area or a shape larger than the terminal-mounting area by a mounting allowance by a projection part 13 formed on a first roller 12 to stick the adhesive body 22 to the coating film 32 at a position where the terminal mounting part (35) is formed, and peeling/removing the portion of the coating film 32, to which the adhesive body 22 is stuck, from the current collector 31 by rotating the first roller 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polymer battery and a peeling device, and more particularly, to a polymer battery having a polymer gel layer provided on an active material layer. The present invention relates to a method for manufacturing a polymer battery and a peeling device for peeling an active material layer to form a terminal mounting portion.

[0002]

2. Description of the Related Art A secondary battery is used as a power source for driving a portable electronic device or the like for the purpose of economy and resource saving. In recent years, its use has been rapidly expanding. Also,
With the miniaturization and high performance of electronic devices, batteries to be used are required to be small, light, and high in capacity.

Conventionally, lead batteries, nickel cadmium batteries, and the like have been used as secondary batteries, but they cannot overcome problems such as energy density and weight. Therefore, in recent years, lithium ion secondary batteries having a high energy density have been used. And even smaller,
As a result of the demand for weight reduction, a secondary battery polymer battery provided with a highly safe polymer gel layer has been put to practical use.

As shown in FIG. 5, a conventional lithium ion secondary battery includes a sheet-shaped positive electrode 122 having a positive electrode lead 121 and a sheet-shaped negative electrode 12 having a negative electrode lead 123.
4 are laminated with a separator 125 interposed therebetween, spirally wound to form a laminated electrode body, and the laminated electrode body is housed in a negative electrode can 111 via an insulating plate 126. Further, a safety valve 127 for bleeding the gas inside is formed at the upper part of the negative electrode can 111,
Gasket 128 for preventing gas leakage
The positive electrode lid 112 is fixed across the. in this way,
In a conventional lithium ion secondary battery, in order to prevent leakage of an electrolytic solution, it is essential to use a hard rigid cell composed of a negative electrode can 111 and a positive electrode lid 112.

[0005] The main device on which the secondary battery is mounted is a small portable device, and a reduction in weight has been demanded. However, this was not possible with hard cells such as steel tubes. In addition, products such as portable personal computers have become thinner, and hard cells have their own thickness, which has been a drag on thinning. In recent years, polymer batteries have been actively developed as secondary batteries that solve these problems.

As shown in FIG. 6, the basic concept of the polymer battery is that the active material layers 213 and 214 of the electrodes applied to the current collectors 211 and 212 are opposed to each other via a gel layer 215, and the gel layer 215 The liquid is impregnated. By adopting a structure in which the electrolytic solution has permeated the gel layer 215, the possibility of liquid leakage is eliminated. As a result, without the need for a hard cell, weight reduction and liberalization of the shape are realized,
And the safety has been improved.

In the production of an electrode for a polymer battery, a suspension in which a positive electrode active material and a negative electrode active material are dispersed is applied on a wide current collector 211, 212 in a desired pattern to form an electrode. A raw material electrode (hereinafter simply abbreviated as “raw material”) is manufactured by applying a polymer gel electrolyte to the substrate. Thereafter, the wide web coated with the gel layer 215 is cut or punched into a predetermined width or size, and the positive electrode and the negative electrode are alternately stacked or wound up alternately. Then, as shown in FIG. 7, a positive electrode lead 216 is attached to the positive electrode, a negative electrode lead 217 is attached to the negative electrode, and a heat sealing 219 is provided around the aluminum laminate film 218 to complete the cell.

Regarding the electrode plate which greatly affects the performance of the polymer battery, it is proposed to increase the volume density of the electrode in order to prolong the charge / discharge cycle life and to increase the energy density, as in the case of the lithium ion battery. Have been.

Here, the electrode plate usually needs to have no coating film at the portion where the terminal for taking out the current is attached, and there is at least a non-coating portion. The pattern is determined by the battery design. At present, the method of forming the non-coated portion is to form a coated portion and a non-coated portion by sequentially controlling the active material layer and the gel layer by mechanical control of a coater head.

Japanese Patent Application Laid-Open No. H10-64526 discloses a method of manufacturing an electrode plate for a lithium ion battery or the like, in which a liquid material having a larger cohesive force than an active material coating film after solidification is formed into a desired pattern in the active material. After the coating material is impregnated and the liquid material is solidified, the active material coating film impregnated with the solidified material is peeled off to form a non-coated portion of the active material coating film on the current collector. Is disclosed.

[0011]

The current method of manufacturing an electrode plate, that is, by mechanically controlling a coater head at the time of coating, for example, by mechanically controlling the opening and closing of a shutter, to form a current collector. In the method of forming the coated portion and the non-coated portion of the active material layer and the gel layer on the top, it was difficult to form a pattern at a high speed, and it was also difficult to form a coating film having a uniform thickness. . Such a problem can be solved theoretically by peeling off only the active material coating film at the portion where the terminal is to be attached.

[0012] However, a conventional adhesive tape is attached to the terminal of the current collector in advance, and after the active material and the gel layer are applied to the entire surface of the current collector, the adhesive tape is peeled off to form the terminal attachment part. In the technology of, for example, if the coating film is formed after applying a peeling adhesive tape to a wide current collector and then cut, it becomes difficult to determine the position where the peeling adhesive tape is attached, and therefore, the peeling adhesive tape However, there is a problem that it becomes difficult to peel off. Even without cutting, it is very difficult to peel off the adhesive tape at high speed without damaging the electrodes. As described above, it has been difficult to economically peel the active material coating film from the current collector surface in an arbitrary pattern.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a method for manufacturing a polymer battery and a peeling apparatus for solving the above-mentioned problems.

A first method for producing a polymer battery is as follows:
Forming a coating film composed of an active material layer and a gel polymer layer on the current collector; and mounting the terminal in the same shape or as the terminal mounting region at the position where the terminal mounting portion of the coating film is formed. Forming a terminal attachment portion by adhering an adhesive having a shape larger than the region by an attachment allowance and peeling and removing the coating film from the current collector. The peeling of the coating film is performed by heating and pressing the adhesive body made of an adhesive liquid material formed on the entire surface of the peeling sheet or in a desired pattern shape to contact the surface of the gel polymer layer. By causing the liquid material to exhibit an adhesive force and peeling the coating film from the current collector in a state where the coating film is bonded to the adhesive.

In the first manufacturing method, the adhesive having a predetermined size is adhered to a position of the coating film where a terminal mounting portion is formed, and the coating film is peeled off from the current collector. Then, the coating film having a shape substantially corresponding to the shape of the bonding portion of the bonding body is removed from the current collector, and the removed portion becomes a terminal mounting portion. Also, since an adhesive having the same shape as the part to which the terminal is attached or a shape larger than the attachment area of the terminal by an attachment margin is adhered to the coating film, and the coating film of the adhered portion is peeled off, The terminal attachment portion is formed by minimizing the removed active material layer. When a polymer battery is formed by using the electrodes on which the terminal attachment portions are formed, a high-performance battery having a large battery capacity is manufactured.

A second method for producing a polymer battery is as follows:
After forming an active material layer having a terminal mounting region on the current collector, forming a gel polymer layer on the entire surface on the active material layer side; and forming a terminal on the gel polymer layer on the terminal mounting region. An adhesive having the same shape as the mounting area or a shape larger than the mounting area of the terminal by the mounting margin is bonded, and the gel polymer layer is peeled off from the current collector to remove the terminal mounting portion. Forming step. The peeling of the gel polymer layer is performed by heating and pressurizing the entire surface of the peeling sheet or the adhesive body made of a liquid material having adhesiveness formed in a desired pattern shape to contact the surface of the gel polymer layer. This is because the gel polymer layer is peeled off from the current collector in a state where the liquid material exhibits an adhesive force and the gel polymer layer is adhered to the adhesive.

In the second manufacturing method, the predetermined size of the adhesive is adhered to the gel polymer layer on the terminal attachment region formed on the active material layer on the current collector. Since the gel polymer layer is further removed and removed, the gel polymer layer having a size substantially corresponding to the shape of the bonding portion of the bonding body is removed from the current collector, and the removed portion becomes a terminal attachment portion. Also, since an adhesive having the same shape as the part to which the terminal is attached or a shape larger than the attachment area of the terminal by an attachment allowance is adhered to the gel polymer layer, and the gel polymer layer of the adhered part is peeled off, The terminal attachment portion is formed by minimizing the removal of the active material layer. When a polymer battery is formed by using the electrodes on which the terminal attachment portions are formed, a high-performance battery having a large battery capacity is manufactured.

The peeling device peels off and removes a desired portion of the film formed on the surface of the sheet, and comprises a first roller rotatably installed, and a surface of the first roller. And a second roller rotatably provided with the projection provided opposite to the first roller and having the surface formed into a curved surface and rotating together with the first roller. An adhesive peeling sheet that is pressed by the convex portion in the direction of the second roller and is fed between the first roller and the second roller;
When the convex portion rotates together with the first roller and comes to a position facing the second roller, so as to come to a position facing the curved surface of the convex portion via the adhesive peeling sheet, An adhesive formed on the surface of the adhesive peeling sheet on the second roller side. In addition, a sheet having a coating formed between the second roller and the adhesive release sheet is fed with the coating toward the adhesive release sheet, and the first roller and the second
The sheet and the adhesive-peeling sheet that have passed between the rollers are fed in a direction away from each other.

In the above peeling device, the first roller and the second roller
When the sheet on which the film is formed is fed between the rollers while the protrusions rotate with the first roller and come to the position facing the second roller, the adhesive is peeled off. Since the adhesive provided on the sheet is located between the convex portion and the second roller, the adhesive is pressed by the convex portion in the thickness direction of the coating via the adhesive peeling sheet and adheres. . Further, when the first and second rollers are rotated and the sheet on which the coating is formed is sent together with the sheet for bonding and peeling, the sheet that has passed between the first roller and the second roller is bonded and peeled. The adhesive sheet provided on the adhesive peeling sheet peels off the film from the sheet in a state where the film is adhered to the adhesive sheet. As a result, a peeled portion of the coating corresponding to the shape of the adhesive body, that is, an unformed portion is formed on the sheet.

As described above, since the above-mentioned peeling device enables peeling of the film corresponding to the shape of the convex portion, the coating device comprising the active material layer and the gel polymer layer is formed on the sheet-like current collector (sheet). After forming the coating (coating), the above-mentioned peeling device forms the terminal mounting portion of the coating film in the same shape as the terminal mounting region or a shape larger than the terminal mounting region by the mounting margin. A terminal mounting portion having the same shape as the terminal mounting region or a shape larger than the terminal mounting region by the mounting margin by removing the coating film from the current collector by bonding the adhesive body of Are easily formed.

A plurality of protrusions are provided on the first roller, and when each protrusion rotates together with the first roller and comes to a position facing the second roller, the adhesive is peeled off. The adhesive body provided on the sheet also has
A plurality of adhesives are provided on the adhesive peeling sheet so as to be between the rollers and the above-described operation, and the above-described operation is repeatedly performed. In the step of forming the terminal mounting portion on the membrane, the terminal mounting portion can be continuously formed, and the terminal mounting portion can be continuously formed on the polymer secondary battery electrode plate.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an example of an embodiment relating to a peeling apparatus of the present invention will be described with reference to a main part configuration diagram of FIG.

As shown in FIG. 1, a first rotating shaft 11 is rotatably provided, and a first roller 12 is formed around the first rotating shaft 11. A plurality of projections 13 are provided on the surface of the first roller 12 as shown in FIG.
Are formed at three locations at equal intervals.
The surface of each projection 13 is, for example, such that the center of the radius of curvature of the surface of each projection 13 coincides with the rotation direction of the first roller 12 and the rotation axis of the first roller 12. It is formed on a curved surface. Further, a temperature controller (not shown) for adjusting the temperature of the surface of each projection 13 is provided in the first roller 12 or each projection 13. This temperature controller is constituted by a heater that heats the surface of each projection 13.

At a position facing the first roller 12,
A second roller 14 is formed around a second rotation shaft 15 which is rotatably installed. A temperature controller (not shown) for adjusting the temperature of the surface of the second roller 14 is provided inside the second roller 14. This temperature controller is configured by a cooler that cools the surface of the second roller 14 from the inside of the roller. For example, the roller may be configured to include a passage through which the refrigerant can flow along the roller surface, a unit for supplying the refrigerant to the passage, and a refrigerant to be supplied to the passage.

Further, the first roller 12 and the second roller 14 are fed between the first roller 12 and the second roller 14 according to the rotation of the first roller 12. The adhesive peeling sheet 21 to be pressed is fed.

The second roller 1 of the adhesive peeling sheet 21
On the surface on the fourth side, each convex portion 13 together with the first roller 12 is provided.
The adhesive 22 is formed such that when it rotates and comes to a position facing the second roller 14, it comes to a position facing the surface of each projection 13 via the adhesive peeling sheet 21. . The adhesive body 22 is made of, for example, a liquid material having an adhesive property, and exhibits an adhesive force when heated and pressed. The liquid substance is solid at normal temperature, is composed of a substance that becomes liquid by being dissolved in an organic solvent or a substance that becomes liquid by heating.Examples of the substance that becomes liquid by heating include polyethylene,
Examples include polypropylene, low-molecular-weight polyethylene, low-molecular-weight polypropylene, derivatives thereof, and mixtures thereof.

In the peeling device 10 having the above-described structure, a sheet (for example, a current collector, hereinafter described as a current collector) 31 is formed between the second roller 14 and the adhesive peeling sheet 21 on the surface thereof. For example, a coating film (hereinafter, referred to as a coating film) 32 is fed toward the adhesive peeling sheet 21 side. Then, the first roller 12 and the second roller 14
The current collector 31 and the adhesive-peeling sheet 21 that have passed between the two are fed in a direction away from each other. That is, the adhesive peeling sheet 21 is inserted between the first roller 12 and the second roller 14 obliquely above the first roller 12 in the drawing, for example, and obliquely right above the first roller 12 in the drawing. Has been sent to. In addition, the current collector 31 is attached to the adhesive release sheet 2 from the left in the drawing.
It is inserted between the first and second rollers 14 and sent out rightward. Therefore, as described above, the first
The current collector 31 and the adhesive separating sheet 21 that have passed between the second roller 14 and the second roller 14 are fed in directions away from each other.

A shaft interval adjusting section (not shown) for adjusting the interval D between the rotating shaft 11 of the first roller 12 and the rotating shaft 15 of the second roller 14 to a desired distance is provided. Is also good. The first rotating shaft 11 and the second rotating shaft 11
Is adjusted to a desired distance, so that the force for pressing the coating film 32 can be adjusted according to the thickness of the current collector 31 or the coating film 32. Become.

In the peeling device 10, the first roller 1
When the current collector 31 on which the coating film 32 is formed is fed between the rollers while rotating the second roller 14 and the second roller 14, each projection 13 rotates together with the first roller 12, and When one comes to a position facing the second roller 14, the adhesive 2 provided on the adhesive peeling sheet 21
2 is located between the convex portion 13 and the second roller 14, the adhesive body 22 is pressed by the convex portion 13 in the thickness direction of the coating film 32 via the adhesive release sheet 21. Will be glued. Furthermore, the first and second rollers 12,
When the current collector 31 on which the coating film 32 is formed is sent together with the adhesive peeling sheet 21 by rotating, the current collector passing between the first roller 12 and the second roller 14 is sent. Since the adhesive strip 31 and the adhesive peeling sheet 21 are fed in a direction away from each other, the adhesive body 22 provided on the adhesive peeling sheet 21 adheres the coating film 32 to the current collector. Peel from 31. As a result, the current collector 31 includes:
For example, a peeled portion of the coating film 32 corresponding to the shape of the adhesive body 22, that is, an unformed portion is formed.

As described above, the peeling device 10 has the projection 13
Of the coating film 32 corresponding to the shape of (1).
Therefore, as shown in FIG. 2, the active material layer 33 and the gel polymer layer 34 are formed on the sheet-like current collector (sheet) 31.
After forming a coating film (coating) 32 composed of the following, the peeling device 10 is used to position the terminal mounting portion of the coating film 32 in the same shape as the terminal mounting region or the terminal mounting region. Also, an adhesive 22 (see FIG. 1) that is large enough for the mounting margin is adhered, and only the coating film 32 in the adhered portion is peeled off from the current collector 31 and removed. In this way, it is possible to easily form the terminal mounting portion 35 having the same shape as the terminal mounting region or a mounting margin larger than the terminal mounting region. The mounting margin is, for example, about 10% of the width of the terminal 41 or about 1 mm. Although the drawing shows an example in which the terminal mounting portion 35 is formed in a part of the width direction of the coating film 32, the terminal mounting portion 35 may be formed over the width direction of the coating film 32.

As shown in FIG. 1, a plurality of projections 13 are provided on the first roller 12, and each projection 13 rotates together with the first roller 12 so that each projection 13 becomes the second projection. The adhesive 22 provided on the adhesive peeling sheet 21 also has a plurality of adhesives 22 on the adhesive peeling sheet 21 so as to be located between each convex portion 13 and the second roller 14 when the adhesive roller 22 comes to a position facing the roller 14. An adhesive 22 is provided. By repeating the above-described operation, for example, the coating film 32 is partially peeled off from the current collector 31 on which the coating film 32 including the active material layer is formed, and the plurality of terminal mounting portions 35 are continuously connected. It becomes possible to form it. Therefore, it is possible to continuously form the terminal attachment portion on the electrode plate for a polymer secondary battery.

The adhesive 22 is made of the release sheet 2
1 may be formed on the entire surface on the second roller 14 side. In this case, since the adhesive 22 exerts an adhesive force when heated and pressed, only the portion of the adhesive 22 pressed by the projection 13 adheres to the coating film 32 and only that portion is adhered. It will be peeled off.

Next, a method for producing the polymer battery of the present invention will be described below. This manufacturing method is a method for manufacturing an electrode plate for a polymer secondary battery, and is different from a conventional method for manufacturing an electrode plate for a non-electrolyte secondary battery. That is, the production method of the present invention focuses on the fact that the adhesive strength between the active material layer and the current collector is reduced in an electrode in which the gel layer (polymer electrolyte) applied to the upper layer has penetrated the electrode active material layer. .
The adhesive strength between the active material layer impregnated with the gel and the current collector is much smaller than the adhesive strength between the gel layer and the active material layer. It was found that by peeling, the active material layer could be peeled off from the current collector at the same time.

First, the first of the polymer battery of the present invention
An example of an embodiment according to the manufacturing method of the present invention will be described with reference to the enlarged views showing the peeled state in FIGS.

As shown in FIG. 4, an active material layer 33 and a gel polymer layer 34 are formed on a sheet-like current collector 31 by a coating method.
Are formed in that order, and then dried to form a current collector 31.
A coating film 32 formed by laminating an active material layer 33 and a gel polymer layer 34 is formed thereon. Thus, the electrode plate 30 for a polymer secondary battery is formed.

As shown in FIGS. 1 and 3,
When the protrusion 13 provided on the surface of the bonding / separating sheet 21 rotates together with the first roller 12 and comes to a position facing the second roller 14, the bonding / separating sheet 21 is interposed. Bonding by applying an adhesive (solidifying agent) so as to come to a position facing the surface of the convex portion 13 and to have the same shape as the terminal mounting region or a shape larger than the terminal mounting region by the mounting margin. The body 22 is formed. As the adhesive (solidifying agent) forming the adhesive body 22, for example, an organic solvent-based substance which is solid at normal temperature and becomes liquid by heating to exhibit adhesiveness can be used. Examples include polyethylene, polypropylene, low molecular weight polyethylene, low molecular weight polypropylene, or derivatives thereof, or mixtures thereof.

When the respective protrusions 13 rotate together with the first roller 12 and come to a position facing the second roller 14, the adhesive separation sheet 21 is
1 between the first roller 12 and the second roller 14 so as to come to a position opposed to the surface of each convex portion 13 through the first, that is, so that the adhesive 22 and the convex portion 13 coincide. Have been.

Further, between the second roller 14 and the adhesive / peeling sheet 21, a coating film 32 having a polymer secondary battery electrode plate 30 formed on the surface thereof is coated with the adhesive / peeling sheet 21.
Feed it to the side. And the first roller 1
The sheet 21 for adhesion and peeling and the electrode plate 30 for a polymer secondary battery are brought into close contact with the convex portion 13 formed on the second roller 14 and the second roller 14. At the same time that pressure and heat are applied to the coating film 32 of the battery electrode plate 30, the second roller 14 cools the polymer secondary battery electrode plate 30 from the direction of the current collector 31. As a result, the gel polymer layer 34
Surface is firmly adhered.

Then, the rotation of the first roller 12 and the second roller 14 proceeds, and the electrode plate 30 for the polymer secondary battery and the sheet for bonding and peeling which have passed between the first roller 12 and the second roller 14. 21 are fed in directions away from each other. For example, as shown in the drawing, the adhesive peeling sheet 21 is inserted between the first roller 12 and the second roller 14 from diagonally above and to the left of the first roller 12, and the first roller 12 It is sent diagonally to the upper right. The electrode plate 30 for a polymer secondary battery is provided with an adhesive peeling sheet 21 and a second roller 1 from the left in the drawing.
4 and transmitted to the right. Thereby, at the time of separation between the convex portion 13 and the second roller 14,
The adhesive 22, the gel polymer layer 34, and the active material layer 33
A force for peeling off from the current collector 31 in the vertical direction acts. Utilizing the peeling force, the portion of the coating film 32 adhered to the adhesive body 22 is removed. Thus, the terminal mounting portion 35 as shown in FIG. 2 is formed.

In the first manufacturing method, the adhesive 22 having the predetermined size is adhered to the position where the terminal attachment portion 35 of the coating film 32 is to be formed.
Since 2 is peeled off and removed, the coating film 32 having a shape substantially corresponding to the shape of the bonding portion of the bonding body 22 is removed from the current collector 31, and the removed portion becomes the terminal mounting portion 35. In addition, an adhesive 22 having the same shape as the part to which the terminal is attached or a shape larger than the attachment area of the terminal by an attachment margin is adhered to the coating film 32, and the applied film 32 in the adhered portion is peeled off. Therefore, the terminal mounting portion 35 is formed by minimizing the removed active material layer 33. When a polymer battery is configured using the electrodes on which the terminal mounting portions 35 are formed, a high-performance battery having a large battery capacity is manufactured.

Next, an example of a method for producing a positive electrode for a polymer secondary battery by the above-mentioned production method will be specifically described below as an example.

A 100 μm-thick polyethylene terephthalate (hereinafter abbreviated as “PET”) film is applied to the release sheet 21 and a 50 μm-thick adhesive is applied in a dry state in a pattern to form an adhesive. 22 is formed.

The first roller 12 of the peeling device 10
A convex part 1 having a diameter of 0 mm and formed on the surface thereof
No. 3 has a curvature radius of 61 mm on its surface. Second
Has a diameter of 120 mm. The range of the temperature and pressure conditions of each roller is determined by the first roller 12.
At a temperature of 30 ° C. to 200 ° C. and a linear pressure of 5 kgf / cm
50 kgf / cm, the temperature of the second roller 14 is 15 ° C.
And Further, the feed speed of the electrode plate 30 for a polymer secondary battery was set to 10 m / min, and a step of forming a terminal attachment portion was performed.

As the adhesive, a polyester adhesive dissolved in a solvent was used. Here, as an example, Byron BX10SS, UR1400, Byron 24 manufactured by Toyobo
Three types of SS were used.

As an example, Table 1 shows that the adhesive used was Bylon BX10SS (polyester resin 35 wt.
%, Toluene 35wt%, methyl ethyl ketone 35wt
%), The results of peeling and removal of the coating film (the gel polymer layer 34 and the active material layer 33) of the electrode plate 30 for a polymer secondary battery are shown.

[0046]

[Table 1]

In the evaluations in Table 1 above, the mark “○” indicates a level at which the terminal can be attached and the electrode state can be peeled to such an extent that battery performance does not matter, and the mark “△” indicates that the coating film was peeled so that the terminal can be welded. The probability that it can be formed is about 1/3 to 1/2, and the x mark is the level that can hardly be peeled off.
Classified.

As another example, when the adhesive of UR1400 and Byron 24SS was used, the results were almost the same as those shown in Table 1 above. From these results, the pressure was 1
It has been confirmed that good peeling can be performed at a temperature of 80 ° C. to 150 ° C. at a pressure of 5 kgf / cm ² or more and 30 kgf / cm ² or less. The active material layer and the gel polymer layer were peeled and removed in a possible state.

Next, a comparative example will be described below. In this comparative example, a generally known pressure-sensitive adhesive tape having adhesiveness to the sheet for bonding and peeling and the bonded body was used. As an example, using the same electrode plate for a polymer secondary battery as in the above embodiment, using a gum tape having a rubber-based adhesive layer as a release sheet, and forming the projections 13 formed on the first roller 12 described with reference to FIG. Thus, the gum tape was adhered to the gel polymer layer of the electrode plate for a polymer secondary battery, and peeling and removal were performed under the same conditions as those in the above-described example. However, the pressure-sensitive adhesive tape hardly adheres to the surface of the gel polymer layer, and at a high temperature, the pressure-sensitive adhesive tape is scorched, making it impossible to peel off the coating film. Similar experiments were performed using a commercially available pressure-sensitive adhesive tape in addition to the gum tape, but none of them could peel off the coating film having the gel polymer layer formed on the surface.

Next, the second embodiment of the polymer battery of the present invention will be described.
An example of the embodiment relating to the manufacturing method of the present invention will be described below. The same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals and described.

First, an active material layer 33 is formed on a sheet-like current collector 31 so as to have a terminal mounting area. That is, the active material layer 33 is formed on the current collector 31 such that the active material layer 33 is not formed in the terminal attachment region. Thereafter, a gel polymer layer 34 is formed on the entire surface of the current collector 31 so as to cover the active material layer 33. Thus, an electrode plate for a polymer secondary battery is formed.

Then, using the peeling device 10 described above,
When the protrusion 13 provided on the surface of the bonding / separating sheet 21 rotates together with the first roller 12 and comes to a position facing the second roller 14, the bonding / separating sheet 21 is interposed. Bonding by applying an adhesive (solidifying agent) so as to come to a position facing the surface of the convex portion 13 and to have the same shape as the terminal mounting region or a shape larger than the terminal mounting region by the mounting margin. The body 22 is formed. As the adhesive (solidifying agent) forming the adhesive body 22, for example, an organic solvent-based substance which is solid at normal temperature and becomes liquid by heating to exhibit adhesiveness can be used. Examples include polyethylene, polypropylene, low molecular weight polyethylene, low molecular weight polypropylene, or derivatives thereof, or mixtures thereof.

When the respective convex portions 13 rotate together with the first roller 12 and come to a position facing the second roller 14, the adhesive / peeling sheet 21
1 between the first roller 12 and the second roller 14 so as to come to a position opposed to the surface of each convex portion 13 through the first, that is, so that the adhesive 22 and the convex portion 13 coincide. Have been.

Further, between the second roller 14 and the adhesive / peeling sheet 21, the gel polymer layer 34 having a polymer secondary battery electrode plate formed on the surface thereof faces the adhesive / peeling sheet 21. Further, when the protrusion 13 and the second roller 14 face each other, the feeding is performed such that the terminal attachment area formed on the active material layer 33 comes therebetween. Then, the adhesive peeling sheet 21 and the electrode plate for a polymer secondary battery are brought into close contact with the convex portion 13 formed on the first roller 12 and the second roller 14, and the convex portion 13 is formed.
At the same time, pressure and heat are applied to the gel polymer layer 34 of the electrode plate for a polymer secondary battery via the adhesive 22, and at the same time, the electrode plate for a polymer secondary battery is Cooling. As a result, the surface of the gel polymer layer 34 is firmly adhered to the surface of the adhesive 22.

Then, the rotation of the first roller 12 and the second roller 14 progresses, and the electrode plate for polymer secondary battery and the sheet 21 for bonding and peeling that have passed between the first roller 12 and the second roller 14. Are sent away from each other. For example, as shown in the drawing, the above-mentioned adhesive peeling sheet 21 is a first diagonally upper left part of the first roller 12.
Is inserted between the first roller 12 and the second roller 14, and is sent out to the upper right of the first roller 12. The electrode plate for a polymer secondary battery is inserted between the adhesive separating sheet 21 and the second roller 14 from the left in the drawing, and is sent out to the right. As a result, when the protrusion 13 and the second roller 14 separate from each other, a force is exerted on the adhesive 22 and the gel polymer layer 34 so that the adhesive 22 and the gel polymer layer 34 are peeled off from the current collector 31 in the vertical direction. Utilizing the peeling force, the gel polymer layer 34 at the portion adhered to the adhesive 22 is removed. In this manner, the terminal mounting portion 35 as shown in FIG. 2 is formed on the terminal mounting region formed on the active material layer 33.

In the second manufacturing method, the active layer 33 is
Gel polymer layer 34 on terminal attachment area formed in
Then, the adhesive 22 having the predetermined size is adhered thereto, and the gel polymer layer 34 is peeled off and removed from the current collector 31. Therefore, the gel having a size substantially corresponding to the shape of the bonded portion of the adhesive 22 is formed. When the polymer layer 34 is removed from the current collector 31,
The removed portion becomes the terminal mounting portion 35. Further, the adhesive 22 has the same shape as the portion to which the terminal is to be attached, or has a shape larger than the attachment area of the terminal by an attachment allowance.
Is adhered to the gel polymer layer 34, and the gel polymer layer 34 at the adhered portion is peeled off and removed, so that the terminal attachment portion 35 is formed by minimizing the removal of the active material layer 33. When a polymer battery is formed using the polymer secondary battery electrode plate on which the terminal attachment portions 35 are formed, a high-performance battery having a large battery capacity is manufactured.

[0057]

As described above, according to the method for manufacturing a polymer battery of the present invention, an adhesive having a predetermined size is adhered to a position where a terminal attachment portion of a coating film or a gel polymer layer is formed. Therefore, since the coating film is peeled off from the current collector and removed, it is possible to peel off the coating film of a required size and a minimum necessary size. Become. Therefore, it is possible to manufacture an electrode plate for a polymer secondary battery capable of forming a high-capacity electrode.

According to the peeling device of the present invention, the adhesive formed on the adhesive peeling sheet is adhered to the film formed on the sheet by the convex portion formed on the roller surface of the first roller. The film can be peeled off from the sheet in a state of being adhered to the adhesive using the rotation of the roller.
Therefore, the coating can be peeled to a desired size depending on the shape of the adhesive body, so that the coating can be peeled and removed to a necessary minimum size from the sheet. Therefore, in the electrode plate for a polymer secondary battery in which a coating film (coating) composed of an active material layer and a gel polymer layer is formed on a sheet-like current collector (sheet), the same shape or the same as that of the terminal attachment region is provided. Since the terminal mounting portion having a shape larger than the terminal mounting area by the mounting margin can be easily formed, it is possible to manufacture the electrode with less waste. Therefore, it is possible to manufacture an electrode plate for a polymer secondary battery capable of forming a high-capacity electrode.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a main part of a peeling device of the present invention.

FIGS. 2A and 2B are a plan view and a perspective view illustrating a terminal mounting portion. FIGS.

FIG. 3 is an enlarged view of a main part for explaining a peeling method.

FIG. 4 is a schematic sectional view illustrating a battery plate for a polymer secondary battery.

FIG. 5 is a sectional perspective view showing a structure of a conventional lithium ion secondary battery.

FIG. 6 is a sectional perspective view schematically illustrating a gel battery.

FIG. 7 is a perspective view illustrating the appearance of a gel battery.

[Explanation of symbols]

10: peeling device, 12: first roller, 13: convex portion,
14 ... second roller, 21 ... adhesive peeling sheet, 22
... Adhesive body, 31 ... Current collector, 32 ... Coating film, 33 ... Active material layer, 34 ... Gel polymer layer, 35 ... Terminal attachment part

Continued on the front page F term (reference) 5H014 AA04 BB01 BB03 BB05 BB08 BB17 CC01 CC07 EE01 5H029 AJ14 AM16 BJ12 BJ14 CJ02 CJ03 CJ04 CJ05 CJ22 CJ30 DJ07 EJ12

Claims (11)

[Claims] 1. A step of forming a coating film formed by sequentially laminating an active material layer and a gel polymer layer on a current collector, and mounting a terminal at a position where a terminal mounting portion of the coating film is formed. A step of forming a terminal mounting portion by bonding an adhesive having the same shape as the region or a shape larger than the mounting region of the terminal by an attachment margin, and peeling and removing the coating film from the current collector. A method for producing a polymer battery, comprising: 2. The whole surface of the release sheet or the adhesive body formed of a liquid material having adhesiveness and formed in a desired pattern shape is brought into contact with the surface of the gel polymer layer by heating and pressing to contact the liquid material. The method for producing a polymer battery according to claim 1, wherein the coating film is peeled from the current collector in a state where the adhesive force is developed and the coating film is adhered to the adhesive body. 3. The liquid substance is solid at normal temperature,
It consists of a substance that becomes liquid when dissolved in an organic solvent or a substance that becomes liquid when heated. The method for producing a polymer battery according to claim 2, wherein 4. The polymer according to claim 3, wherein the substance which becomes liquid by heating comprises polyethylene, polypropylene, low molecular weight polyethylene, low molecular weight polypropylene, a derivative thereof, or a mixture thereof. Battery manufacturing method. 5. A step of forming an active material layer having a terminal mounting region on a current collector, and then forming a gel polymer layer on the entire surface on the active material layer side; By bonding an adhesive having the same shape as the terminal mounting region or a shape larger by the mounting margin than the terminal mounting region to the polymer layer, and peeling and removing the gel polymer layer from the current collector. Forming a terminal attachment portion. 6. An adhesive body made of an adhesive liquid material formed on the entire surface of the release sheet or in a desired pattern shape is brought into contact with the surface of the gel polymer layer by heating and pressurizing to contact the liquid material. The method for producing a polymer battery according to claim 5, wherein the gel polymer layer is peeled off from the current collector in a state where the adhesive force is developed and the gel polymer layer is adhered to the adhesive body. 7. The liquid substance is solid at normal temperature,
7. The method for producing a polymer battery according to claim 6, comprising a substance which becomes liquid when dissolved in an organic solvent or a substance which becomes liquid when heated. 8. The polymer according to claim 7, wherein the substance which becomes liquid by heating comprises polyethylene, polypropylene, low molecular weight polyethylene, low molecular weight polypropylene, a derivative thereof, or a mixture thereof. Battery manufacturing method. 9. A peeling device for peeling and removing a desired part of a film formed on a surface of a sheet, comprising: a first roller rotatably installed; A convex portion having a curved surface formed thereon, a second roller facing the first roller and rotatably installed, and the convex portion rotating together with the first roller. The first roller is pressed in the direction of the second roller.
When the convex portion is rotated together with the first roller and comes to a position facing the second roller, An adhesive formed on the second roller side surface of the adhesive / peeling sheet so as to come to a position facing the surface of the convex portion via the adhesive / peeling sheet. Stripping device. 10. A sheet having a film formed thereon is fed between the second roller and the sheet for bonding and peeling with the film facing the sheet for bonding and peeling, and the sheet and the sheet for bonding and peeling are provided. 10. The peeling device according to claim 9, wherein the paper is fed in a direction away from each other after passing between the first roller and the second roller. 11. The peeling device according to claim 9, wherein a temperature controller for adjusting the temperature of the surface of the convex portion is provided in the first roller or the convex portion.